JPH0352812Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention is applicable to shoring trusses, more specifically,
This relates to shoring trusses used when constructing relatively long span bridges.

[Conventional technology and problems]

For example, when constructing a concrete bridge, shoring is required to support the slab formwork placed between the piers.

Conventionally, the general structure of shoring as described above is
Because it was constructed by erecting a large number of temporary frames and pipe support groups on the ground, a large number of materials were required, equipment costs were high, and assembly and disassembly required a lot of labor and time. However, there are drawbacks such as poor work efficiency and increased construction costs.

In addition, in order to eliminate the disadvantages of shoring using temporary frames and pipe supports as described above, shoring is constructed from trusses installed between bridge piers, and the truss manufactured in a factory is transported to the site. It is considered that the use of temporary frames and pipe supports can be eliminated by constructing the bridge between the piers.

The above-mentioned truss shoring simply needs to be erected on-site between the piers, so it has the advantage of saving labor and shortening the work period, and reducing equipment costs. There is a problem in that it is extremely difficult to transport long-span trusses to work sites due to constraints on transport methods.

This idea was made to solve the above-mentioned problems with truss-type shoring, and provides a shoring truss that can be easily transported to the work site and can be easily adopted. The purpose is to

[Means for Solving the Problems] In order to solve the above-mentioned problems, this invention consists of a combination of a plurality of beam members, and the connection side ends of the beam members that are to be connected to each other are A joint portion combining a shear support surface and a tension compression support surface is formed in a step shape that joins each other in both beam members,
Both beam members are removably connected by bolts and nuts at the tensile compression support surface of the joint portion.

[Effect]

By transporting the multiple beam members that make up the truss in a divided state to the work site, joining the joints of the beam members that are to be connected to each other at the site, and connecting their tension and compression support surfaces with bolts and nuts. Assemble the truss.

By installing the assembled truss between the piers, the support for the slab formwork is completed, and during concrete pouring, the load applied to the joint of the truss is supported by the shear support surface, and the tension and compression loads are supported by the shear support surface. Support with tension compression support surface.

〔Example〕

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

As shown in Figure 1, a truss 1 for shoring is made up of a combination of a central beam 2, end beams 3, 3 connected to both ends of the central beam 2, and adjustment beams 4, 4 attached to both end beams 3, 3. It is configured with a length to be constructed between piers 5 and 5,
A joint portion 6 that can be freely connected and separated is provided at the connecting portion between the center beam 2 and both end beams 3, 3.

The central beam 2 is formed by connecting an upper chord member 7 and a lower chord member 8, each of which is made of two parallel channel members back to back, with a vertical member 9 and an inclined member 10, and both end beams 3, 3 are also formed by connecting the upper chord member 7 and the lower chord member 8, which are parallel to each other, back to back. The member 7a and the lower chord member 8a are made of a vertical member 9a and an inclined member 10a, and are formed to have the same cross-sectional structure as the central beam 2. (See Fig. 4) In the case of the first example shown in Figs. 2 to 4, the joint portion 6 connecting the central beam 2 and the end beams 3 A horizontal plate 11 is attached to each of the joining side ends of the horizontal plate 11, an upper vertical plate 12 is attached to one end of the horizontal plate 11, and a lower vertical plate 13 is attached to the other end of the horizontal plate 11. The joint surface of the horizontal plate 11 serves as a shear support surface 14, and the joint surfaces of the upper and lower vertical plates 12, 13 serve as tension and compression support surfaces 15, 16.

In the joint portion 6, the horizontal plate 11 of the center beam 2 rests on the horizontal plate 11 of the end beam 3,
The lower part of the horizontal plate 11 of the central beam 2 is recessed so that both ends of the central beam 2 are supported by the end beams 3, 3, and conversely, the lower part of the horizontal plate 11 of the end beams 3, 3 protrudes. It is formed to do so.

In the joint part 6, bolt holes 18 and 19 are drilled in the upper and lower vertical plates 12 and 13 for removably connecting them with bolts and nuts 17, and when the center beam 2 and the end beams 3 are connected, The shear support surfaces 14 of both horizontal plates 11, 11 support the shear loads of the truss 1, and the upper vertical plates 12,
Twelve support surfaces 15 support compressive loads.

Therefore, the bolts and nuts 17 that connect the upper vertical plates 12, 12 serve to prevent the central beam 2 and the end beams 3 from shifting laterally.

In addition, the support surface 1 of the lower vertical plates 13, 13
A tensile load acts on 6, which is supported by bolts and nuts 17. Therefore, the lower vertical plates 13, 13 are connected to the upper vertical plate 1.
The number of bolts and nuts 17 is increased compared to the combination of 2 and 12 to improve the tensile load support strength.

The adjustment beams 4, 4 have a truss 1 on the end beams 3, 3.
bolts so that the position can be freely adjusted in the longitudinal direction.
They are connected with nuts so that the length of the truss 1 can be adjusted according to the spacing between the piers 5, 5.

Next, FIG. 5 shows a second example of the joint part 6 that connects the center beam 2 and the end beams 3, and the first
Components that are the same as those in FIGS. 4 to 4 are designated by the same reference numerals and will not be described further.

The joint portion 6 of this second example has an inclined plate 11 instead of the horizontal plates 11, 11 in FIG.
a, 11a and by slanting the shear support surface 14a, this support surface 14a can also support tensile force.

Although not shown in the figure, by preparing multiple types of end beams with different lengths for the central beam 2 of a constant length and selecting the end beam to be used, the total length of the truss can be adjusted to the spacing between the piers. Alternatively, the central beam 2 may be provided with a blank.

The truss of this invention has the above-mentioned configuration, and the center beam 2, end beams 3, 3, and adjustment beams 4, 4 are transported to the work site in a disassembled state, and each beam is sequentially connected with bolts and nuts at the site. By doing so, a truss 1 of a predetermined length is assembled, and this truss 1 is attached to the piers 5.
It will be constructed between 5 and 5.

The construction of the truss 1 is as shown in Fig. 1.
Attach the brackets 21, 2 using anchors at the top of 5.
1 is provided protrudingly, a jack 22 is installed on the brackets 21, 21, and the ends of the adjustment beams 4 located at both ends of the truss 1 are placed on the jacks 22. In this way, a plurality of truss 1 to pier 5,5
After that, the slab formwork 24 is laid on the truss 1 via the joists 23, and the formwork 2
4. Form a slab by pouring concrete on top.

The load during concrete pouring is supported by the truss 1, and the load is concentrated on the joint 6 of the truss 1 itself due to the connection between the center beam 2 and the end beams 3, but the shear support surface 14, tension and compression support surfaces 15 and 16, and bolts and nuts 17, the joint portion 6 has a large load-bearing capacity.
The truss 1 can withstand large loads.

[Effects] As described above, according to this invention, a truss is assembled by connecting multiple beam members at the joint with bolts and nuts, so it can be transported to the work site in a short, low-bulk state. Long span shoring can be made into a truss.

In addition, the joint part is formed into a stepped shape with a combination of shear support surfaces and tension/compression support surfaces, which are connected using bolts and nuts, which improves the load-bearing strength of the joint part. Even though it is constructed as a truss, sufficient strength can be obtained, making it possible to construct heavy structures.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view showing the state of use of the truss according to this invention, Fig. 2 is an enlarged longitudinal sectional front view of the main parts of the above, Fig. 3 is a longitudinal sectional side view of the same main parts, and Fig. 4 is the same. FIG. 5 is an exploded perspective view of the main parts and a front view showing a second example of the joint part. 1...Truss, 2...Central beam, 3...End beam,
6...Joint part, 11...Horizontal plate, 1
2... Upper vertical plate, 13... Lower vertical plate, 14... Shearing support surface, 15, 16... Tension compression supporting surface, 17... Bolt, nut, 18, 1
9...Bolt hole.

Claims (1)

[Claims for Utility Model Registration] 1. Consisting of a combination of a plurality of beam members, a joint portion that combines a shear support surface and a tension compression support surface is provided at the connecting end of the beam members that are to be connected to each other. A shoring truss in which both beam members are formed in a step shape that joins each other, and both beam members are removably connected with bolts and nuts at the tensile compression support surface of the joint part. 2. The shoring truss according to claim 1 of the utility model registration claim, wherein the shear support surface of the joint portion is formed horizontally. 3. The shoring truss according to claim 1, wherein the shear support surface of the joint portion is formed as an inclined surface.