JPH0223639Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention can be used in underground pipe installation work, etc.
This invention relates to a device for retaining earth in an excavated trench.

[Prior art]

Generally, in order to install underground pipes, a trench is excavated and the pipe is buried in the trench, but during the installation work it is necessary to provide earth retaining for the excavated trench to ensure safety.

Conventionally, in order to retain earth in such excavated trenches, the first
As shown in Figures 2 to 13, there is a method in which struts 4 are strung across each of the sheet piles 3 and 3 that are erected facing each other, and earth retaining is carried out using this alone, and as shown in Figures 14 and 15, After the sheet piles 3, 3 have been erected, there is a method in which the uprights 5, 5 are fitted over them, and the uprights 5, 5 are fixed with struts 4.

[Problem that the invention attempts to solve]

However, among the above-mentioned conventional techniques, the former is easy to install and retains the earth for each sheet pile without using uprights, so existing pipes may appear in the excavation groove or the excavation groove may be curved. Although it has the advantage of being able to deal with fine details, it is not suitable for soft ground or deep excavated trenches because it is a partial earth retainer and has low rigidity. On the other hand, the latter has the advantage of having strong earth retaining rigidity and being able to cope with soft ground and deep excavated trenches because it uses a raised bed. The problem was that the work was troublesome, and construction was difficult in places where the excavation trench was curved.

The purpose of the present invention is to solve the above-mentioned disadvantages of the conventional method, and to take advantage of the advantages of the conventional earth retaining method without raising and the earth retaining method with raising, in the installation work of underground pipes. To provide an earth retaining device that can finely deal with various construction conditions including curved excavated trenches, etc., and can safely and easily perform earth retaining work on excavated trenches.

[Means for solving problems]

In order to achieve the above-mentioned object, the earth retaining device of the present invention is provided by forming a cross-shaped frame by attaching short ribs of an appropriate length orthogonally to a vertical member having a predetermined length;
The gist of the present invention is to fix a strut bracket to the upper or lower surface of the rib, and to detachably attach the strut between the ribs via the bracket.

[Effect]

According to the present invention, sheet piles and struts can be easily set using a formwork with strut brackets assembled in a cross shape in advance.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a front view showing an embodiment of the earth retaining device of the present invention, Fig. 2 is a side view of the same, and Fig. 3 is a plan view of the same.
0 is 〓-shaped steel or U-shaped steel, which is formed from square pipe steel or the like into a vertical member 11 having a predetermined length.
Short ribs 12, which are cross members cut to a length of ~1.5 m, are orthogonally arranged and attached by welding or bolting. A strut bracket 13 is fixed in advance to the upper or lower surface of the horizontal upright 12 of the cross-shaped frame 10 by welding or the like. A handle 16 is fixed to the upper end of the vertical member 11 by welding or the like to improve handling when the temporarily assembled cross-shaped frame 10 is inserted into or pulled out of the excavation groove 1. good. In the figure, 14 is a strut whose end can be connected to the bracket 13.
It is also possible to attach a fixing hydraulic jack (not shown).

Next, to explain the earth retaining method using the device of the present invention, when constructing earth retaining for excavated trench 1,
First, a cross-shaped frame 10 is formed by temporarily assembling the vertical members 11 and the uprights 12 in a cross shape on the ground, and a pair of left and right cross-shaped frames 10 is formed, and the pair of cross-shaped frames 1
Install the strut 14 between the brackets 13 and 13 for struts 0 and 10. At this time, the cross-shaped frame 10,1
The length of the strut 14 that spans between the 0-space uprights 12 is adjusted to such a length that it can be built smoothly into the excavated trench 1.

Next, hold the handle 16 of the vertical member 11 and hold the strut 14.
The cross-shaped frames 10, 10 connected together are built into the excavation trench 1, and the sheet piles 15 are built into the back of the upright 12. At this time, depending on the condition of the ground, the sheet piles 15 are selected to be spaced apart as shown in FIG. 6 or closely spaced as shown in FIG. 7. Next, as shown in FIG. 8, the struts 14 are straightened so that the sheet piles 15 come into close contact with the ground.

At this time, if the ground of the excavation trench 1 is particularly soft or if it is necessary to leave the excavation for a relatively long period of time, as shown in FIG. As shown in FIGS. 10 and 11, the flange 19 welded to the end surface of the tuck 12 can be butted together and bolted, or the tuck 12 can be connected by bolts. A socket type joint or the like is applied in which one end is formed into a bulged socket 12a and the other end is inserted into this socket 12a.

Incidentally, the above-mentioned riser 12 may be fixed to the vertical member 11 by welding or the like as described above, but generally the height of the riser 12 is adjusted according to the excavation depth of the groove 1. , if necessary, stand up 12 and cross beam 1
4 is a second embodiment of the invention, so that it can be installed in multiple stages, as shown in Figures 4 and 5.
is a mounting bracket 17, a bottle 18,
Alternatively, it may be attached so as to be slidable in the vertical direction using a kotsuta or the like. In this case, the upper and lower positions of the riser 12 are set according to the depth of the excavation groove, and the strut bracket 13 is integrally fixed to the riser 12.
The tension position by the strut 14 is determined through the.

Furthermore, the strut 14 can be made of wood or the like, which is cut to a predetermined length each time, but it is easier to handle if a regular screw type or hydraulic jack is used. , reliably mounted.

Furthermore, if the vertical members 11 of the cross-shaped frame 10 are made wide, they can also be used as sheet piles, so that the pitch between the sheet piles 15 can be increased correspondingly in excavated trenches with good ground.

In addition, as another method of use, it is also possible to first erect only the cross-shaped frame 10 into the excavated trench 1, and then set the struts 14 within the trench 1.

[Effect of idea]

As described above, the earth retaining device of the present invention has a simple structure and is lightweight, so it is easy to handle, and it is possible to reduce the number of workers and the number of work steps.

In addition, since the length of the upright can be shortened, it can be fully applied to curved excavation trenches.
Since a cross-shaped upright is fixed to the vertical members in advance, and the bracket for attaching the strut is fixed to the upright, much of the assembly is done on the ground, reducing the chance of workers entering the trench. The construction work can be carried out safely even on soft ground.

[Brief explanation of drawings]

Figure 1 is a front view showing an embodiment of the earth retaining device of the present invention, Figure 2 is a side view of the same, Figure 3 is a plan view of the same,
FIG. 4 is a side view showing the main parts of the second embodiment, FIG. 5 is a plan view of the same as above, FIGS. 6 and 7 are front views showing the construction state of the earth retaining device according to the present invention, and FIG. Fig. 6 is a sectional view, Fig. 9 is a front view showing another construction state according to the present invention, Figs. 10 and 11 are cross-sectional views of the main parts of the above, and Fig. 12 is a vertical sectional view showing the conventional construction method. 13 is a plan view of the same as above, FIG. 14 is a longitudinal side view showing another conventional construction method, and FIG. 15 is a plan view of same as above. 1... Excavation groove, 10... Cruciform frame, 11... Vertical member, 12... Ribbon, 12a... Socket, 13
...Bracket for strut beam, 14...Strut beam, 15...
Sheet pile, 16...Handle, 17...Mounting bracket, 18...
...Bolt, 19...Flange.

Claims (1)

[Scope of utility model registration request] A cross-shaped frame is formed by attaching short ribs of appropriate length orthogonally to a vertical member having a predetermined length, and a strut bracket is fixed to the upper or lower surface of the rib. An earth retaining device characterized in that a strut is removably attached between the sills via.