JP2005042376A - Manhole structure and its construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manhole structure and its construction method capable of reducing costs of the storage, carrying, and handling of parts, while enjoying the advantages of easiness in construction and high strength by use of a precast part. <P>SOLUTION: This manhole structure M has a plurality of concrete panels 14a, 14b, 14c and 14d composed of precast concrete prepared in advance, and a placed concrete part C for joining these edges. Thus, the manhole structure M having high strength and quality can be inexpensively constructed by simplifying the installation work of forms 32 and 34 and performing work such as carrying and installation by a small vehicle or small heavy construction machine. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a manhole structure attached to manage pipes in sewerage facilities and a construction method thereof.
[0002]
[Prior art]
The manhole of the sewer system is composed of a rectangular box-shaped cylindrical portion (hereinafter referred to as “manhole structure”) extending upward from the underground sewer, and this manhole structure constructs a concrete formwork in the field. It was generally constructed by placing concrete. However, there is an increasing demand for shortening the construction period and earthquake resistance, and a construction method for assembling precast concrete parts that are preliminarily molded into a cylindrical shape or a box shape is being implemented. In this method, for example, a process of separately manufacturing and assembling components such as a box-shaped portion connected to the sewer, a cylindrical portion extending upward from the sewer, and a contact portion with the ground surface is adopted. In the case of a large manhole deep underground, the cylindrical portion is further divided into several cylindrical blocks.
[0003]
[Problems to be solved by the invention]
However, in the method of preparing and assembling such cylindrical or box-shaped precast element parts in advance, the element parts manufactured by precasting are three-dimensional, large in size, and heavy in weight. For handling, a large transport vehicle and heavy machinery are required, which increases the construction cost. Also, a large amount of space is required to stock the parts.
In addition, there is a problem in that joint processing is necessary at the joints of the constituent elements when assembling, and the cost for that is increased. Furthermore, it is difficult to adjust the dimensions and shape according to the situation at the site.
[0004]
The present invention was made in view of the above circumstances, and reduces the cost of parts stock and transportation / handling while enjoying the advantages of ease of construction and high strength by using precast parts. An object of the present invention is to provide a manhole structure that can be used and a construction method thereof.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the manhole structure according to claim 1 has a plurality of concrete panels arranged so that the edges are close to each other, and a placing concrete part that joins the adjacent edges. It is characterized by that.
[0006]
In the first aspect of the present invention, a plurality of concrete panels made of precast concrete prepared in advance are joined by a cast concrete part that joins edges adjacent to each other, and a manhole structure having a predetermined shape is obtained. Is building. By producing concrete panels as parts in the factory, fine work can be performed in a stable work environment, so strength, quality and work efficiency are improved. Moreover, since each component is in the form of a panel, operations such as transportation and installation are easy, and the vehicle and construction heavy machinery can be reduced in size. As a result, the cost can be reduced.
[0007]
The manhole structure according to claim 2 is characterized in that, in the invention according to claim 1, the concrete panel is provided with a connecting reinforcing bar protruding outward from the edge.
In the invention according to the second aspect, the reinforcing bars for bonding and the bonding of the concrete panels are strengthened by binding the reinforcing bars for binding or by including them in the cast concrete part.
[0008]
The manhole structure according to claim 3 is the invention according to claim 1 or 2, wherein the concrete panel is a side wall panel constituting a side wall of the manhole structure.
In the invention according to claim 3, the side wall panel is installed so as to constitute the side wall of the manhole structure, and the edge thereof is joined by the cast concrete part. A box-shaped manhole structure is constructed by arranging a bottom plate and a top plate as necessary.
[0009]
The manhole structure according to claim 4 is the invention according to claim 3, wherein the manhole structure includes a bottom plate panel or a top plate panel, and at least one of the bottom plate panel or the top plate panel and the side wall panel. Are pin-coupled.
In invention of Claim 4, positioning is performed easily and correctly by using a pin for each joint surface of a concrete panel.
[0010]
The construction method of a manhole structure according to claim 5, wherein a plurality of concrete panels are arranged so that edges of each other are close to each other, a form surrounding the space including the edges is constructed, and the form A concrete placement space surrounded by the edge is formed, concrete is placed in the concrete placement space, and the concrete panels are coupled to each other.
[0011]
In invention of Claim 5, since concrete placement is partial, compared with the conventional method of placing concrete and constructing the whole, it is in the field of construction of a formwork, concrete placement, etc. The work can be greatly reduced, and the construction period and work cost can be reduced. In addition, compared to the conventional method of assembling pre-cast box-shaped or cylindrical components, each component is panel-like, making it easy to carry and install, and reduce the size of vehicles and construction heavy machinery. Can be achieved.
[0012]
The construction method of a manhole structure according to claim 6 is characterized in that, in the invention according to claim 5, the concrete panel is provided with a connecting reinforcing bar protruding outward from the edge. To do.
In the invention described in claim 6, the concrete is reinforced by projecting the reinforcing bars in the concrete placement space and the concrete is reinforced, and the connection between the concrete panels is strengthened.
[0013]
A construction method for a manhole structure according to a seventh aspect is characterized in that, in the invention according to the fifth or sixth aspect, the concrete panel is a side wall panel constituting a side wall of the manhole structure.
In the invention according to claim 7, the side wall panel is installed so as to constitute the side wall of the manhole structure, a concrete placement space is formed at the edge thereof, and concrete is placed in this, thereby forming a tubular shape. The manhole structure is constructed.
[0014]
The construction method of a manhole structure according to claim 8 is the invention according to claim 7, wherein the manhole structure has a bottom plate panel or a top plate panel, and at least one of the bottom plate panel or the top plate panel. The side wall panel is pin-coupled.
In invention of Claim 8, positioning is performed easily and correctly by using a pin for the joint surface of each concrete panel.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 to FIG. 9 are diagrams showing an embodiment of the present invention. FIG. 1 is a perspective view showing an external appearance of a constructed manhole structure, and FIG. 2 is a view showing a box culvert constituting a tube rod. FIG. 3 is a sectional view taken along line AA in FIG. 2, FIG. 4 is a sectional view taken along line BB in FIG. 2, FIG. 5 is an exploded perspective view of the manhole structure, and FIG. Is a perspective view of a side wall panel, FIG. 7 is a construction flow diagram for constructing a manhole structure, FIG. 8 is an enlarged view of a joint portion between a box culvert and a manhole, and FIG. It is an enlarged view of a part. In FIG. 5, the front formwork is omitted.
[0016]
As shown in FIG. 1, the manhole structure M includes a top plate panel 10 and a bottom plate panel 12 which are vertically opposed to each other, and six precast concrete panels (hereinafter, referred to as four side wall panels 14a, 14b, 14c and 14d). This is called a “concrete panel”) and a circular manhole (small-diameter cylindrical portion) 16 serving as an entrance and exit. The bottom plate panel 12 and the side wall panels 14a, 14b, 14c and 14d, and the side wall panels 14a, 14b, 14c and 14d and the top plate panel 10 are positioned by sharing a pin (not shown) inserted on the joint surface, Joined with mortar or the like. Further, the side wall panels 14a, 14b, 14c, and 14d are joined together by a placing concrete portion C formed by placing concrete in a concrete placing space S (see FIG. 5) formed at the corners of the four corners. Has been. In designing such a manhole structure M, the wall portion can be analyzed as a rigid body and a horizontal frame member, and the top and bottom portions can be analyzed as a four-side simple support plate.
[0017]
The concrete panels 10, 12, 14a, 14b, 14c, and 14d that constitute the manhole structure M are used by placing concrete on a predetermined formwork in a factory, curing it, and carrying it to the site. To do. If concrete panels of different dimensions are prepared as stock, it can respond quickly to demand. Concrete panels are plate-shaped and do not require a large space even if they are stocked. Compared to box-shaped and cylindrical precast concrete members, concrete panels are smaller in size and lighter, and therefore, easy to carry in and handle on site, Miniaturization can be achieved.
[0018]
Each individual concrete panel is provided with a necessary shape portion. That is, as shown in FIG. 2, the top panel 10 is formed with a manhole connection hole 18 to which the circular manhole 16 is attached, and the three side wall panels 14a, 14b, and 14c have box culverts constituting a sewer ( A box culvert connection hole 22 connected to the (connection pipe) 20 is formed. These concrete panels are reinforced by arranging reinforcing bars, and the reinforcing bars are arranged so as to bypass the manhole connection hole 18 and the box culvert connection hole 22 described above. As shown in FIG. 6, a connecting reinforcing bar 24 that reinforces a connecting portion with other side wall panels 14 a, 14 b, 14 c, and 14 d protrudes from end surfaces of side edge portions of the side wall panels 14 a, 14 b, 14 c, and 14 d. Yes.
[0019]
FIG. 7 is a construction flowchart for constructing the manhole structure M, and the steps for constructing the manhole structure M will be described below with reference mainly to FIGS. 7 and 5. First, a foundation work for laying foundation concrete 28 on the gravel layer 26 is performed (step 1 (ST1)), and the bottom panel 12 is installed at a predetermined position (step 2). Next, the four side wall panels 14a, 14b, 14c, and 14d are installed on the edge of the bottom plate panel 12 (step 3). For example, pin holes are formed at positions corresponding to the lower end surfaces of the side wall panels 14a, 14b, 14c, and 14d and the upper surface of the bottom plate panel 12, and positioning is performed by inserting metal pins or the like into the pin holes. . Further, in order to erect the side wall panels 14a, 14b, 14c, and 14d, they are supported by using an appropriate auxiliary tool. Sealing is performed by placing an adhesive or mortar between the bottom plate panel 12 and the side wall panels 14a, 14b, 14c, and 14d.
[0020]
The bottom plate panel 12 is longer than the side wall panels 14a, 14b, 14c and 14d by twice the thickness of the side wall panel, and a prismatic space extending vertically is formed at the corner. Next, bar arrangement is performed in this space (step 4). That is, the connecting reinforcing bars 24 projecting from the end faces of the respective side wall panels 14a, 14b, 14c, 14d are bound to each other, and the axial reinforcing bars (not shown) extending vertically and the hunch bars (not shown) at the upper and lower ends. ) And arrange. Next, the mold frames 32 and 34 that cover the prismatic space at the corners are assembled (step 5), and the concrete placement space S is formed. In this embodiment, the molds 32 and 34 are equilateral chevron steel, and are attached by using attachment tools (not shown) embedded in the side wall panels 14a, 14b, 14c and 14d inside and outside the corners. ing. Thereby, the compact molds 32 and 34 can be assembled with a small work load.
[0021]
Then, concrete is placed in the molds 32 and 34 (step 6), cured (step 7), and solidified to disassemble the molds 32 and 34 (step 8). In parallel, the top panel 10 is installed (step 9), and the circular manhole 16 is attached to the manhole connection hole 18 (step 10). Next, the box culvert (connection pipe) 20 is attached to the box culvert connection hole 22 of the side wall panels 14a, 14b, 14c, and 14d (step 11). A flexible joint 36 that covers the inner periphery is attached to the connection portion between the box culvert 20 and the side wall panels 14a, 14b, 14c, and 14d (see FIG. 8 and FIG. 9, step 12). The flexible joint 36 passes a flexible sheet 38 made of thick-walled rubber or the like between the box culvert 20 and the side wall panels 14a, 14b, 14c, and 14d, and is fixed with bolts 40. The flexible sheet 38 is attached by being bent so that the central portion protrudes inward, and even if the connecting pipe 20 and the manhole structure M are misaligned, liquid leakage from the connecting portion is prevented. . Next, each connecting portion is sealed with mortar or the like (step 13), and the construction of the manhole structure M is finished.
[0022]
Since the manhole structure M according to this embodiment is partially placed in concrete as compared with the manhole structure M manufactured by a conventional method in which the whole is placed on the spot and constructed, the molds 32 and 34 are used. Work on site such as construction and concrete placement is greatly reduced, and the construction period and work cost can be reduced. In addition, by producing concrete panels as parts in a factory, fine work can be performed in a stable work environment, so that strength, quality, and work efficiency are improved.
[0023]
In addition, it has the same performance as a structure as compared with the one manufactured by a conventional method of assembling precast-molded box-shaped or cylindrical components, and each component is in a panel shape. Work such as installation is easy, and downsizing of vehicles and heavy construction equipment can be achieved. In addition, it is possible to reduce the labor for joint processing at the joint. In addition, by combining concrete panels with different thicknesses, vertical and horizontal widths, etc., it is possible to construct a manhole structure M of appropriate dimensions and shape according to the situation, and respond quickly to demand. The space for stock can be greatly reduced.
[0024]
In addition, the said embodiment is an example and this invention is not limited to this. In the above embodiment, six concrete panels are used. However, the present invention is not limited to this, and for example, the bottom may be formed by concrete placement on site. In this case, the bottom may be formed simultaneously with the construction of the side wall or separately. Although the manhole structure M has a rectangular cross section in this embodiment, it can have an arbitrary polygonal cross section, and can also have a circular, elliptical or other cross section by using an arc plate-like concrete panel. it can. In the above-described embodiment, a single-layer box structure is used. However, a multi-layered manhole structure M can be obtained by stacking the box structures in multiple stages.
[0025]
【The invention's effect】
As described above, according to the present invention, the manhole structure having high strength and quality can be reduced by simplifying the installation work of the formwork and carrying out the work such as transportation and installation with a small vehicle or heavy construction equipment. Can be built at a cost.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an appearance of a manhole structure according to an embodiment of the present invention.
FIG. 2 is a plan view showing a connection between a manhole structure and a box culvert.
FIG. 3 is a cross-sectional view taken along line AA in FIG.
4 is a cross-sectional view taken along line BB in FIG.
FIG. 5 is an exploded perspective view of a manhole structure.
FIG. 6 is a perspective view of a side wall panel.
FIG. 7 is a construction flow diagram for constructing a manhole structure.
FIG. 8 is an enlarged view showing a joint portion between a box culvert and a manhole.
FIG. 9 is an enlarged view of a portion D in FIG.
[Explanation of symbols]
10 Top panel 12 Bottom panel 14a, 14b, 14c, 14d Side wall panel (concrete panel)
24 Reinforcing bars (reinforcing bars)
32, 34 Formwork C Placed concrete part M Manhole structure S Concrete placement space

Claims (8)

A plurality of concrete panels arranged so that the edges are close together;
A manhole structure comprising: a placing concrete portion that joins the adjacent edges. The manhole structure according to claim 1, wherein the concrete panel is provided with a connecting reinforcing bar that protrudes outward from the edge. The manhole structure according to claim 1 or 2, wherein the concrete panel is a side wall panel constituting a side wall of the manhole structure. The manhole structure according to claim 3, wherein the manhole structure includes a bottom plate panel or a top plate panel, and at least one of the bottom plate panel or the top plate panel and the side wall panel are pin-coupled. . Place multiple concrete panels so that their edges are close to each other,
Constructing a formwork surrounding the space including the edge part to form a concrete placement space surrounded by the formwork and the edge part;
A method for constructing a manhole structure, comprising placing concrete in the concrete placement space and connecting the concrete panels together. 6. The method for constructing a manhole structure according to claim 5, wherein the concrete panel is provided with a connecting reinforcing bar protruding outward from the edge. The said concrete panel is a side wall panel which comprises the side wall of a manhole structure, The construction method of the manhole structure of Claim 5 or Claim 6 characterized by the above-mentioned. The manhole structure according to claim 7, wherein the manhole structure includes a bottom plate panel or a top plate panel, and at least one of the bottom plate panel or the top plate panel and the side wall panel are pin-coupled. How to build.

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