JP7078241B1 - Fence for safety measures of residual formwork construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure the safety of workers working at a high place continuously at the time of installing the residual formwork and the concrete placing work in the civil engineering work relating to the concrete structure using the plate-shaped residual formwork. Reusable temporary safety fence. SOLUTION: A fitting to be fixed to the upper back surface or the upper surface of a residual formwork, a fitting to engage with the fitting and to be attached to the remaining formwork, and to be attached to the fitting. Provided is a safety fence provided with a connecting tool that can be easily removed, a support member that stands on the connection tool, and a handrail member that is erected substantially horizontally between the support members. [Selection diagram] Fig. 1

Description

The present invention relates to safety measures at the time of construction using a residual formwork for constructing a civil engineering structure.

In concrete works, precast products are frequently used from the viewpoint of shortage of on-site workers and ensuring stable quality. Precast concrete products are concrete products that are manufactured in advance at the factory and are suitable for the site. The residual formwork used for civil engineering work is a concrete plate material that does not need to be demolded, and is used by connecting them. Ready-mixed concrete is placed on the back side, and the cast concrete and the remaining formwork are integrated. Build a concrete structure.

Remaining formwork in civil engineering work is widely used, especially in high places such as sabo dam construction, because there is no need to use scaffolding because there is no demolding work. In that case, except for the lifting of the remaining formwork related to the installation of the remaining formwork and the work of the crane for putting in concrete, the workers perform the casting work such as assembling the remaining formwork and compacting the concrete on the back side of the remaining formwork. Will proceed. Generally, when there is a risk of a worker falling on a work floor with a height of 2 m or more, a handrail or the like is installed at the end of the work floor. However, the remaining formwork is piled up one after another, and it is a laborious task to efficiently implement temporary safety measures each time, and safety measures such as prevention of workers from falling at high places are important issues. It has become.

11 (1) to 11 (4) show the outline of the construction procedure of the construction using the remaining formwork.
FIG. 11 (1) shows a state in which a new residual formwork is assembled on the installed residual formwork with the hardened concrete surface as the base surface, and the remaining formwork is the same as the lower installed residual formwork. The remaining formwork support rods erected on the remaining formwork from the connecting metal fittings and anchors embedded in the concrete are already installed. This is to fix the remaining formwork and counter the pressure from the ready-mixed concrete placed on the base surface.
In FIG. 11 (2), a temporary safety fence for construction is provided on the remaining formwork at the stage when the remaining formwork is installed. The next task is to ensure the safety of workers when placing ready-mixed concrete from the base surface to the upper surface of the assembled residual formwork.
FIG. 11 (3) shows the ready-mixed concrete being placed in the process. In this state, the worker spreads and compacts the ready-mixed concrete thrown in by a crane or the like on the ready-mixed concrete whose feet are unstable. There is a need to do.
FIG. 11 (4) shows a state in which ready-mixed concrete is placed up to the planned surface, curing work is performed, and after the concrete is hardened, a new residual formwork is assembled. The latency removal and cleaning work on the concrete upper surface is generally performed before the remaining formwork is installed. After that, as shown in FIG. 11 (4), the work of removing the safety fence and assembling the remaining formwork is currently performed at a high place without the safety fence.

Figure 12 shows a safety fence that is generally used for residual formwork work at high altitudes. In FIG. 12 (1), a space on a cylinder is provided in the vertical direction between the adjacent remaining formwork so that the support of the safety fence can be easily erected. FIG. 12 (1-1) shows a detailed view between adjacent remaining formwork. In FIGS. 12 (2) and 12 (2-1), a concrete insert nut is embedded in the upper surface of the remaining formwork, and the pillar foundation of the safety fence is bolted.

As a safety measure in such aerial work of the remaining formwork, a support is built by using a support hole or an insert nut provided on the upper surface of the remaining form as shown in FIG. A safety fence with handrails is used. Regarding high-altitude work in related concrete works, an invention has been proposed in which a support is attached by a lower fixing part that sandwiches and fixes the horizontal end thick material of the formwork above and below and an upper holding metal fitting that is attached to the stile at the top of the formwork. (Japanese Patent Laid-Open No. 2014-43678). These safety measures are directly attached to the formwork, and no safety fence is provided when the formwork is installed or removed, which is insufficient as a safety measure for the entire work.

In addition, as a safety measure during related high-altitude work, a net material is laid by connecting to the wall material at the construction stage of reinforced soil wall construction, and a safety fence support pipe is installed on the inner surface of the front upright part of the wall material. An invention to be attached has been proposed (Japanese Patent Laid-Open No. 2010-112133). In addition, as a safety measure in the opening of the wall panel (wall material), there is an invention provided with a grip portion that is detachably fixed and a horizontal handrail provided on the front side of the opening (Japanese Patent Laid-Open No. 2005-188170). There is an invention of a fence that hooks the hooks of at least two hook-shaped locking tools to the upper end of the wall material by sandwiching them, and locks the rod-shaped member that crosses the opening to the hook-shaped locking tool (Japanese Patent Laid-Open No. 2012). -154805). The point that is not sufficient as a safety measure related to these reinforcing soil wall construction is that when assembling the wall material, the connective (reinforcing material connecting metal fittings) part of the wall material becomes an obstacle, so the fence must be removed. In the proposal to install the safety fence in front of the wall material, there is a problem that the work of removing the safety fence is dangerous.

As a safety measure in the reinforced soil wall construction, the applicant attaches a connecting part having a support to the connective projecting from the wall material of the reinforced soil wall, and omits between the support parts. We have proposed an invention that provides a safety fence with a handrail that is erected horizontally. (Patent No. 6346369).

Japanese Unexamined Patent Publication No. 2014-43678 Japanese Unexamined Patent Publication No. 2010-112133 Japanese Unexamined Patent Publication No. 2005-188170 Japanese Unexamined Patent Publication No. 2012-154085 Japanese Patent No. 6346369

The problem to be solved is a series of work such as assembling the remaining formwork and placing concrete, which is the work near the remaining formwork with a vertical or similar gradient at a high place in the concrete structure construction work using the remaining formwork. In the entire process, safety is ensured without restricting the behavior of workers such as wearing safety belts.

The present invention is for easily installing a safety fence in civil engineering work relating to a concrete structure using a plate-shaped residual formwork, and is installed on the upper back surface of the residual formwork or the upper surface of the residual formwork. A fitting, a fitting that engages with the fitting and attaches to the remaining formwork, a connecting tool to be attached to the fitting, and a support member to be erected on the connecting tool. Provided is a safety fence provided with a handrail member erected substantially horizontally between the column members.

The safety fence of the present invention in the concrete structure construction work using the residual formwork becomes a handrail of a worker and a fence for installing a safety belt when assembling the residual formwork with a vertical or a gradient close to it, and is a safety measure during work. In addition, safety can be ensured so that the worker does not fall from a high place during the work of removing the latency in the concrete placing work on the back side of the remaining formwork, compacting the ready-mixed concrete, and subsequent curing.

FIG. 1 is an explanatory diagram of an installation state of a safety fence of the present invention. (Example 1) FIG. 2 is an explanatory diagram showing the foundation of the safety fence. (Example 1) FIG. 3 is an explanatory diagram showing the details of the attachment receiver and the attachment. (Example 1) FIG. 4 is an explanatory diagram showing the details of the connector. (Example 1) FIG. 5 is an explanatory diagram showing an installation procedure of the safety fence of the present invention. (Example 2) FIG. 6 is an explanatory view in which the attachment receiver is installed on the upper surface of the lower formwork. (Example 3) FIG. 7 is an explanatory diagram of a slidable engagement structure for the attachment receiver and the attachment. (Example 4) FIG. 8 is an explanatory diagram showing an example of a removable mounting tool mounted on the upper surface of the lower formwork. (Example 5) FIG. 9 is an explanatory diagram of a mounting tool when the back slopes of the lower formwork and the upper formwork change. (Example 6) FIG. 10 is an explanatory view when bolting the mounting tool and the connecting tool. (Example 7) FIG. 11 is an explanatory diagram showing a construction procedure and the like for general construction of the remaining formwork. FIG. 12 is an explanatory diagram showing a safety fence used for general residual works.

In this specification, the description and illustration of concrete work using the remaining formwork in high places are omitted except for the parts related to the safety fence. The parts other than the portion related to the safety fence are, for example, the residual formwork connecting metal fittings and the residual formwork support rods described in “0004”. Hereinafter, the terms used in the present specification will be described.
In civil engineering work related to concrete structures using plate-shaped residual formwork that is continuously installed upward, the lower remaining formwork of the remaining formwork is used as the lower formwork, and the remaining formwork is placed on the lower formwork. The frame is the upper formwork.
The plate-shaped residual formwork is a concrete formwork having a front surface and a back surface and having an area that can be used on the upper and lower surfaces and the left and right side surfaces. The front surface is the surface where the concrete structure is in contact with the space or soil, and the back surface is the surface where ready-mixed concrete is poured. It is not always a rectangular parallelepiped. A parallelepiped having a slope on the front surface and the back surface and having the upper surface as a horizontal plane is also included. Further, even if the front surface shape is not a rectangular shape but a deformed shape, the upper end of the front surface can be in the horizontal direction by connecting them is targeted.
As an example of using the remaining formwork in aerial work, the construction of the structure used for the dam is mainly shown in the examples, and the slope of the front surface is from 3 minutes to vertical. The 3-minute gradient means a gradient having a horizontal length of 0.3 with respect to a height of 1. That is, the slope corresponds to θ of tan θ = 1 / 0.3. However, the gradient of the remaining formwork according to the use of the present invention is not limited to the above range.

In the embodiment, the mounting tool, the mounting tool, the connecting tool, and the support member are assumed to be metal products, and the joint portion and the connecting receiving portion of the mounting tool, and the upper plate portion and the lower plate portion of the connecting tool are assumed. As the side plate portion, a steel material having a predetermined thickness, for example, a bent steel material for structural use or a welded steel material for welded structure is used. Since 12 mm to 16 mm is used for the connecting metal fittings such as the joining member bolt and the connecting tool locking bolt, the bolt insertion hole has a diameter of about 15 mm to 20 mm. The connector locking pin is a machined steel rod. The present invention shows an embodiment based on a circular pipe for a support member and a handrail member, but as a support member, as a support such as a square pipe, a channel steel, a shaped steel such as angle steel, in addition to a circular pipe. It suffices as long as it has the strength of. As for handrails, there are also rods, etc. other than circular pipes. However, all of the above members are not limited to being steel or metal, and may have a predetermined strength.

FIG. 1 is a situation diagram in which the safety fence 2 of the present invention is installed on the upper part of the back surface of the lower formwork 11 having a vertical gradient on both the front surface and the back surface. The upper formwork 12 has the same shape and the same slope as the lower formwork, but is indicated by a broken line because the upper formwork has not been installed at the safety fence installation stage. 2 (1) and 2 (2) are enlarged views of the lower part of the attachment receiver 3, the attachment tool 4, the connecting tool 5, and the support column member 6 in the installation state of the safety fence. FIG. 2 shows the arrangement of each component, and FIGS. 3 and 4 show a disassembled member structure diagram or a cross-sectional view.
As shown in FIG. 1, the mounting receiver in this example is an embedded female screw 31 embedded in two places on the upper part of the back surface 16 of the lower formwork. Details are shown in FIGS. 3 (1-1) and (1-2). FIG. 3 (1-2) shows the range abcd of FIG. 2 (2) in the direction of AA displayed in FIG. 2 (1), and FIG. 3 (1-1) shows FIG. 2 (2). ) Is displayed in the BB direction, and the range efgh of FIG. 2 (1) is displayed. The embedded female screw has an insertion portion on the back surface side of the lower formwork, and has a tip flange near the center inside the lower formwork.

Regarding the mounting tool 4 of this example, the mounting tool and the joining member bolt 44 shown in FIG. 2 are shown in a state of being separated by ensuring a separation between the contacting members from FIGS. 3 (2-1) to (2). 2-4). FIG. 3 (2-1) is a left side view of the fittings showing the range ijkl of FIG. 2 separated. FIG. 3 (2-2) is a front view from the back surface side of the remaining formwork showing the range mnop of FIG. 2, and FIG. 3 (2-4) is a front view of the joint member bolt. FIG. 3 (2-3) is a plan view of the mounting tool of FIG. These represent a state in which the connecting tool 5 shown in FIG. 2 is removed while being separated from the contact surface with the lower formwork 11 and the upper formwork 12 as described above. The entire mounting tool has an inverted L shape as shown in the side view of FIG. 3 (2-1).
The joint portion 41, which is a section of the flat plate at the lower part of the fitting, has a joint surface 42 that is in contact with the back surface 16 of the lower formwork and a joint member insertion hole 43. It is tightened by a joint member bolt 44 screwed into the embedded female screw 31 of the attachment receiving tool, and is vertically attached vertically upward to the back surface of the lower formwork by the frictional force acting on the attachment portion. The "engagement with the mounting receiver" described in claims 1 and 2 means, in this example, the embedded female screw of the mounting receiver and the joint member bolt screwed to the female screw. Engagement with the joint member insertion hole.
The connecting receiving portion 45 is a flat plate section above the boundary between the lower form and the upper form and bent in a direction substantially perpendicular to the back surface of the upper form, and is for locking the connecting tool to the central portion. A connecting receiving portion locking hole 46 is provided. Regarding the direction substantially perpendicular to the back surface of the upper form of the connecting receiving portion, it is a shape in a state where the support column member 6, the handrail member 7, and the like are attached. This is because it is necessary to consider the weight of the support column member and the handrail member. The reason why they are installed in the substantially right angle direction is that the support member 6 and the handrail member 7 standing on the connector 5 do not interfere with the installation of the upper formwork, and are installed at the end of the work at a high place as the safety fence 2. This is to ensure safety.

Details of the connector 5 of this example are shown in FIGS. 4 (1) to 4 (6). As shown in the cross-sectional view taken along the line AA of FIG. 4 (2), the front view of FIG. The upper surface of the connecting receiving portion is in contact with the upper plate portion and the lower surface in a state of being inserted into the space surrounded by the plate portion 51, the lower plate portion 52, and the side plate portion 53. The connecting tool is placed on the connecting receiving portion, and the fitting and the connecting tool are pivotally fixed by the connecting tool locking pin 57.
Explaining with a schematic perspective view of FIG. 4 (5), in the state before the shaft stop with the connector locking pin, the connector is placed on the coupling receiving portion in the front-rear direction (longitudinal direction), left-right (short direction), and Although it is in a state where it can move up and down, the slidable left and right movements in the lateral direction are restricted by the side plate portions suspended from both ends of the upper plate portion, and the load from the support member 6 is applied. The vertical movement thereof is restricted by the lower plate portion laterally provided from the upper plate portion and the horizontal plate portion. In this example, the lower plate is connected to the left and right side plates to form a continuous plate, but it is sufficient if the upper plate can be restricted from moving upward, so for example, a strip shape is formed from both horizontal plates. It may be installed horizontally, or it is sufficient that the connecting tool does not fall from the connecting receiving portion even if it is installed horizontally from one side. Further, the connecting tool locking pin penetrating the connecting receiving portion through the upper plate hole and the lower plate hole shown in FIG. 4 (2) pivotally stops the connecting portion on the connecting receiving portion and moves back and forth (longitudinal direction). It is stopped and forms a shaft stop as shown in FIG. 4 (6). In this example, a lower plate hole is required, but it is not always necessary depending on the shape of the lower plate hole for the reason described above.
In this example, the state in which the connecting receiving portion is surrounded by the upper plate portion, the lower plate portion, and the side plate portion of the connecting tool is a free insertion state, but the movement of the connecting tool on the connecting receiving portion is as described above. In addition to the friction between the shaft stop of the coupling tool locking pin, the upper surface of the coupling receiving portion, and the lower surface of the upper plate portion of the coupling tool, the effect of the handrail member 7 erection between the column members is added, resulting in a stable connection state. There is. The connecting tool is an independent member that is easy to attach and detach to the fitting, because the connecting tool is removed from the fitting attached to the lower formwork 11 and attached to the upper formwork 12. This is because we aimed to make it easy to install. Further, regarding the strut member and the handrail member corresponding to the main body portion in the application of the safety fence 2, the strut member is erected on the connecting tool, and when the connecting tool is attached to the fitting, the strut member is simultaneously supported. Members are installed where they are needed. In this example, the handrail member 7 is erected horizontally between the column members by the handrail mounting member 71, which is a U-shaped mounting bracket in FIG. 1 (1). Therefore, it is possible to simultaneously install the handrail member erected between the predetermined columns by arranging the necessary personnel or suspension equipment. The procedure will be described with reference to Example 2.

As shown in FIG. 3 (1-1), the mounting receiver 3 of this example is an embedded female screw 31 embedded in the upper part of the back surface of the lower formwork 11, as shown in FIG. 3 (1-2). It is installed on the back surface 16 of the formwork. The attachment receiver is not limited to the embedded female screw as long as it is a member that engages with the joint portion that joins the joint portion 41 of the attachment tool 4 to the surface of the lower formwork. However, the fitting must be a removable joining member and a fitting to be able to be removed from the fitting and reused. Further, a mounting receiver to be mounted by sliding the back surface or the upper surface of the formwork will be described in the fourth embodiment.

Regarding the mounting tool 4 of this example, as shown in FIGS. 3 (2-1) to (2-3), the joint portion 41 is in contact with the back surface of the lower formwork 11 and has a vertical direction in the longitudinal direction, and is in the upper stage. It reaches the lower part of the back of the formwork 12. The connecting receiving portion 45 is bent in the direction perpendicular to the back surface of the upper formwork and extends to the tip in the longitudinal direction. In the mounting tool of this example, the steel plate is bent into an inverted L shape as described above, and the joint member insertion hole 43 of the joint portion and the connection receiving portion locking hole 46 of the connection receiving portion are punched. Is given. This fitting must have strength to support the load of the safety fence body such as the connecting tool 5 and the support column to be mounted on the fitting, and the material is SS400, the thickness is 6 mm, the width is 50 mm, and the joint length is 25 cm. , A member made by bending a steel material with a length of 8 cm, which is a member that can withstand the weight of a safety fence at a weight of about 10 kg / place at a height of 80 cm, which is erected on the connector and the connector. I confirmed that there was.

In the connecting tool 5 of this example, as shown in FIGS. 4 (1) and 4 (6), the upper plate portion 51, the lower plate portion 52, and the side plate portion 53 surround the connecting receiving portion 45 of the attachment tool 4. It is connected to the mounting tool by a connecting tool locking pin 57 penetrating the connecting receiving portion locking hole 46 communicating with the upper and lower plate holes 55 and 56. Further, a support member 6 is erected on the upper plate portion. For such fittings, the upper plate and side plates are made of SS400, 6 mm thick, 120 mm wide, and the width of the upper plate is 80 mm, and the height of the left and right side plates is 20 mm. On the other hand, a flat plate having a width of 80 mm and a thickness of 6 mm was welded as the lower plate portion, and a circular pipe having an outer diameter of 60 mm and a thickness of 2 mm was welded as a support. As the connector locking pin, a 13 mm round steel machine was used.

FIGS. 5 (1) to 5 (4) show the implementation status of the concrete work by the remaining formwork 1 on the safety fence 2 of the present invention. The construction situation will be explained in four stages. The construction is a dam construction process with vertical slopes on both sides at a height of 2 m or more.
(1) The first stage is shown in FIG. 5 (1). The stage at which the construction related to the lower form 11 of the present invention is completed is referred to as the first stage. This is the stage where the concrete on the back side of the lower formwork has hardened. The reason why the top height of the right residual formwork 1R is lower than that of the left residual formwork 1L is that water is used for removing the latency of the concrete surface and cleaning the surface, and the residual on the wastewater treatment side is to facilitate the wastewater treatment. This is because the top of the formwork is set to the concrete casting height. On the other hand, the left remaining formwork is set so that the concrete casting height is lower than the lower surface of the mounting tool 4 of the present invention. This prevents drainage to the left side and makes it possible to reuse all the members except the attachment receiver 3 for the safety fence of the present invention. The height of the remaining formwork is different on the left and right, but the height of the upper handrail of the safety fence is the same, and it is about 85 cm from the concrete placement surface.
(2) The second stage is shown in FIG. 5 (2). It shows how the upper formwork 12 on the left side is in the process of being installed, but the upper formwork with the attachment tool installed on the upper surface of the lower formwork is craned while leaving the safety fence of the lower formwork. Suspended and assembled by. After that, the residual formwork connecting metal fitting 13 for connecting the lower formwork and the upper formwork and the residual formwork support rod 14 for the upper formwork will be installed. Next, after all the upper formwork on the left side was assembled, the connector locking pin 57 of the lower formwork was pulled out for each span of the safety fence, and the removed formwork was attached to the upper formwork. The fitting is fitted into the fitting receiving portion 45 of the fitting, the extracted connecting tool locking pin is inserted, and the connecting tool connected to the lower form is attached to the fitting of the upper formwork. As for the remaining formwork on the right side, the upper formwork has already been installed, and a new remaining formwork and safety fence have been installed for stage 1.
It shows that this stage is completely different from the conventional safety fence shown in "0004". That is, when installing a new remaining formwork, it is possible to work with the existing safety fence left, and when removing the existing safety fence, the upper formwork functions as a safety fence. It can be understood.
(3) As shown in Fig. 5 (3), the third stage is the stage where ready-mixed concrete transported by a crane or the like is placed, and at this stage, the workers spread the concrete and compact it. There is.
(4) As shown in FIG. 5 (4), the fourth stage shows a state in which concrete is poured to a predetermined position related to the upper formwork and the curing work is completed. It shows that the construction was done up to the height of the remaining formwork.

In this embodiment, the safety fence 2 in which the attachment receiver 3 is installed on the upper surface of the lower formwork 11 will be described. In the examples of FIGS. 6 (1) and 6 (2), the joint portion 41 of the fitting 4 is attached to the upper surface 17 of the lower formwork, and the front surface of FIG. 6 (2) is at the boundary with the upper formwork 12. Visually, it has a trapezoidal shape with the upper surface of the lower formwork as the bottom, and as shown in the left sectional view of FIG. 6 (1), a fitting installation space 33 extending to the center of the upper formwork is provided. The attachment tool is attached by a joining member bolt 44 screwed into the embedded female screw 31 which is the attachment receiver 3 installed on the upper surface of the lower formwork. Unlike the first embodiment, the connecting receiving portion 45 of the fitting is extended without bending and is connected to the connecting tool 5. The connection method is the same as that of the first embodiment.
In the examples of FIGS. 6 (3) and 6 (4), the joint portion of the fitting is mounted on the surface of the recess formed on the upper surface of the lower formwork. The recess extending to the center of the lower formwork is the space for installing the fittings. Others are the same as the examples of FIGS. 6 (1) and 6 (2).

Regarding the engagement structure of the joint portion 41 between the attachment receiver 3 and the attachment tool 4, the engagement between the embedded female screw and the bolt (male screw) is described in the first embodiment, but in addition, the fourth and the implementation In Example 5, a case where the attachment receiver and the attachment have a sliding engaging structure will be described.
The fourth embodiment shown in FIG. 7 has a structure in which the attachment receiver and the attachment tool can slide in the vertical direction. FIG. 7 (1) is a left sectional view showing an engagement structure between a sliding landing receiver 35 as a landing tool and a joint portion 41 of the landing tool. The sliding mounting receiver 35, which is a mounting receiver installed in the lower formwork 11, has a sliding mounting receiver base portion 36 having a bottom plate to which a plurality of anchors are attached inside the lower formwork and FIG. 7 (2). ) And (3), it is installed horizontally on the bottom plate and is installed at the left and right restraint portions 37 that restrain the joint portion 41 of the fitting from the left and right and the lower end portion of the bottom plate to prevent the joint portion from slipping downward. The sliding locking portion 38 is provided. In the case of engagement between the fitting and the fitting, the fitting can be easily molded by simply dropping the flat plate portion of the joint into the left and right restraining portions of the fitting and inserting the fitting. It can be joined to the back of the frame. In this example, the upper surface of the bottom plate of the sliding mounting receiver base of the sliding fitting is flush with the back surface of the lower formwork, and the fitting is joined to the back surface of the formwork. Even when this bottom plate is attached to the back surface of the lower formwork, the upper surface of the bottom plate to which the attachment tool is joined is regarded as above the back surface of the lower formwork.

FIG. 8 shows an example of a removable mounting tool 4 when the mounting tool 3 is installed on the upper surface of the lower formwork 11. The fitting 4 shown in FIG. 6 is fastened to the lower form 11 by the joining member bolt 44, but it is difficult to remove it from the fitting installation space. The locking pin mounting tool 32 is used as the mounting tool 3 as shown in FIGS. 8 (1) and 8 (2), and the mounting tool is provided by the locking pin insertion hole 43-1 having the joining / removing portion 43-2. Can be removed. The joint removal portion in this example has the fitting installation space 33 on the front right so that it can be removed by pushing the joint portion 41 of the fitting tool into the right back of the upper surface of the lower formwork after removing the connecting tool 5. Widely secured in the direction. Further, in order to ensure stability when the safety fence main body such as the connecting tool and the support is installed, brackets are installed at two places below the tip of the connecting tool on the mounting tool side to serve as a mounting tool locking assist 34. The locking assist is not limited to the one installed in the connector as in this example. In order to prevent the fitting from sliding to the center of the remaining formwork, the fitting should be provided with a pin and its penetration hole so that it can be locked on the upper surface of the lower formwork, and the pin should be removed when necessary. Allows the attachment to be removed.

FIG. 9 describes a mounting tool when the back slopes of the lower formwork 11 and the upper formwork 12 are different. FIG. 9 (1) shows a case where the back surface of the lower formwork has a 3-minute gradient and the back surface of the upper formwork is vertical. In this case, the bending angle from the fitting 4 joint 41 to the connecting receiving portion 45 is made smaller than 90 degrees, and the connecting receiving portion is provided in a direction perpendicular to the back surface of the upper formwork.
In FIG. 9 (2), the back surface of the lower formwork is vertical and the back surface of the upper formwork has a three-minute gradient. In this case, a bent portion 47 is provided at the joint portion of the fitting in accordance with the change in the back slope of the formwork near the boundary between the lower formwork and the upper formwork. Therefore, the bending to the connecting receiving portion is provided at 90 degrees as in the first embodiment, and the direction perpendicular to the back surface of the upper formwork is secured. In this case, the erection direction of the columns is a three-minute gradient, but this is because the upper formwork is installed. Adjustment is required for the height that should be secured as a safety fence.
In the example of FIG. 9 (1) above, the separation distance between the back surface of the upper formwork and the column is large, but it is adjusted by the distance in the longitudinal direction of the upper part of the joint. If necessary, a bent portion may be provided at the joint portion of the fitting in accordance with the change in the back slope of the formwork shown in FIG. 9 (2).

FIG. 10 shows an example in which the coupling between the fitting 4 and the coupling 5 is fastened with the coupling locking bolt 58 as a fastening member to form the fastening portion 59. This is a specific example of claim 2. As shown in FIGS. 10 (1) to 10 (6), the connector does not include the lower plate portion 52. The upper plate portion 51 of the connecting tool is placed on the connecting receiving portion of the fitting, and the connecting receiving portion locking hole and the connecting tool locking bolt penetrating the upper plate hole are fastened by the nut on the lower surface of the connecting receiving portion. By doing so, it is attached to the connecting receiving part. The left and right side plate portions 53 of the connector are provided as anti-slip to the left and right by guiding the connector in the front-rear direction on the connector when the connector is attached to the connector, but they are indispensable. is not. The connection between the attachment tool and the connection tool according to this example is an extremely stable connection method, but it also has a drawback that it takes time to connect, and it may be necessary depending on the conditions of the site.

1 Remaining formwork (indicated as 1L on the left side and 1R on the right side), 11 Lower formwork, 12 Upper formwork, 13 Remaining formwork connecting metal fittings, 14 Remaining formwork support rod, 16 Remaining formwork back, 17 Remaining formwork Top surface, 18 concrete or ready-mixed concrete 2 Safety fence
3 Mounting tool, 31 Embedded female screw, 32 Locking pin mounting tool, 33 Mounting tool installation space, 34 Mounting tool locking assistance, 35 Sliding mounting device, 36 Sliding mounting device base , 37 Left and right restraint part, 38 Sliding locking part
4 Mounting tool, 41 Joint part, 42 Joint surface, 43 Joining member insertion hole, 43-1 Mounting tool locking pin insertion hole, 43-2 Joint removal part, 44 Joint member bolt, 45 Connection receiving part, 46 Connection Receiving part locking hole, 47 joint bent part
5 Connector, 51 Upper plate, 52 Lower plate, 53 Side plate, 54 Shaft stop, 55 Upper plate hole, 56 Lower plate hole, 57 Connector locking pin, 58 Fastener (connector locking bolt) And nuts) 59 Fasteners 6 Strut members 7 Handrail members, 71 Handrail mounting members

Claims (4)

In civil engineering work related to concrete structures using plate-shaped residual formwork that is continuously installed upward, the lower remaining formwork (hereinafter referred to as the lower formwork) is placed on the lower formwork. The remaining formwork is the upper formwork.) It is a temporary safety fence to be installed.
The attachment receiver fixed to the upper back or upper surface of the lower formwork,
A joint portion that is a plate material that engages with the attachment receiver and is attached to the upper back surface or the upper surface of the lower formwork, and extends from the joint portion to form a boundary between the lower formwork and the upper formwork. A mounting tool that is located above and has a connecting receiving portion that is a plate material in a substantially perpendicular direction to the back surface of the upper formwork, and a connecting receiving portion locking hole that penetrates the connecting receiving portion.
An upper plate portion having a surface that is mounted on the connecting receiving portion of the fitting and is capable of sliding the upper surface of the connecting receiving portion as a lower surface, and an upper plate portion that is vertically suspended from both ends in the lateral direction of the upper plate portion. A side plate portion that prevents the upper plate portion from slipping in the lateral direction on the connecting receiving portion, and a side plate portion that is laterally installed from the side plate portion to restrict the upper plate portion from moving upward from the connecting receiving portion. A shaft provided with a lower plate portion, an upper plate hole provided in the upper plate portion that can communicate with the connecting receiving portion locking hole, and a shaft stop pin for inserting the upper plate hole and the connecting receiving portion locking hole. A connecting tool provided with a stop and removable from the connecting receiving part,
A strut member erected on the upper surface of the upper plate portion of the connector, and
A handrail member erected substantially horizontally between the columns and
Safety fence with. In civil engineering work related to concrete structures using plate-shaped residual formwork that is continuously installed upward, the lower remaining formwork (hereinafter referred to as the lower formwork) is placed on the lower formwork. The remaining formwork is the upper formwork.) It is a temporary safety fence to be installed.
The attachment receiver fixed to the upper back or upper surface of the lower formwork,
A joint portion that is a plate material that engages with the attachment receiver and is attached to the upper back surface or the upper surface of the lower formwork, and extends from the joint portion to form a boundary between the lower formwork and the upper formwork. A mounting tool that is located above and has a connecting receiving portion that is a plate material in a substantially perpendicular direction to the back surface of the upper formwork, and a connecting receiving portion locking hole that penetrates the connecting receiving portion.
The upper plate portion placed on the connecting receiving portion of the fitting, the upper plate hole provided in the upper plate portion communicating with the connecting receiving portion locking hole, the upper plate hole, and the connecting receiving portion. A connecting tool provided with a fastening member provided with a fastening member for inserting the stop hole and fastening the upper plate portion to the connecting receiving portion, and a connecting tool that can be removed from the connecting receiving portion.
A strut member erected on the upper surface of the upper plate portion of the connector, and
A handrail member erected substantially horizontally between the columns and
Safety fence with. The attachment receiver is an embedded female screw embedded in the lower formwork, and the joint member bolt into which the attachment tool is screwed into the embedded female screw and the joint member insertion hole through which the joint member bolt penetrates. The safety fence according to claim 1 or 2, which is a mounting tool provided with a joint portion of a plate material provided with the above. The sliding mounting receiver base portion in which the mounting receiver has a bottom plate to which a plurality of anchors are attached inside the lower formwork, the left and right restraining portions that restrain the joint portion of the mounting tool from the left and right, and the bottom plate. The safety fence according to claim 1 or 2, wherein the fitting is removable and is provided with a sliding locking portion which is installed at the lower end portion of the joint portion to prevent the joint portion from slipping downward .

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