JP2024030704A - Earth retaining device for shallow excavation trenches - Google Patents

Abstract

[Problem] To provide an earth retaining device suitable for trench excavation work in shallow trenches, which can be easily installed without using heavy equipment, etc., and can be installed even if the width of the excavation trench is narrow. SOLUTION: The earth retaining device for shallow excavated trenches according to claim 1 includes a pair of plate-like members that are locked to the upper end edge of the excavated trench, and an extendable and retractable earth-retaining device that is installed between the pair of plate-like members. Consists of a removable beam material, an inner plate provided on the excavated groove side of the plate member and parallel to the longitudinal direction of the plate member, and a support plate provided between both ends of the plate member and the inner plate. did. [Selection diagram] Figure 3

Description

The present invention relates to an earth retaining device for an excavated trench that can improve workability, and more particularly to an earth retaining device suitable for shallow trench excavation work.

Traditionally, in excavated trenches excavated to lay underground pipes for lifelines such as water and sewage pipes, gas transportation pipes, communication lines, and power lines, shoring was assembled to prevent the side walls from collapsing. Earthworks are being carried out.

More specifically, steel sheet piles are placed along both sides of the excavated trench, and uprights are installed horizontally along each steel sheet pile so that they face each other, and between the uprights. By installing struts, an excavation trench is constructed that allows installation of buried pipes while preventing steel sheet piles from collapsing due to earth pressure.

In addition to earth retaining shoring using steel sheet piles, a construction method called a simple vertical earth retaining method is also widely used. This simple earth retaining method includes a method called the slide rail method and a method called the vertical plate method.

In the slide rail method, as shown in FIG. 7, a pair of guide members 3 with a plurality of struts 2 installed between opposing slide rails 1 are built into a pair of excavated grooves, and the slide rails forming each guide member 3 are assembled. The earth retaining of the excavated wall is carried out by inserting the panels 4 over one space. Since the slide rail 1 uses a heavy object such as H-shaped steel, the work of erecting the guide member 3 into the excavated groove is usually carried out by a heavy machine such as a backhoe.

As shown in FIG. 8, the vertical plate method is an earth retaining system consisting of two vertical beams 6 that extend in parallel to each other in the vertical direction, and a plate 7 installed between these two vertical beams 6. A box 8 which forms a panel 5 and has struts 2 installed in advance in accordance with the excavation depth between a pair of retaining panels 5 is erected into the excavation groove. In this construction method, the plates 7 and the like are heavy objects, so the work of stacking the boxes 8 into the excavated trenches is usually carried out using heavy equipment such as a backhoe.

Patent Document 1 discloses an earth retaining device and an earth retaining construction method that sequentially connect the above-mentioned vertical plate type earth retaining shoring.

Japanese Patent Application Publication No. 2006-70437

The various earth retaining methods mentioned above are essential for the safety of workers in excavated trenches, but in the case of shallow trenches with a depth of about 1.5 meters, the danger is ignored and the soil The fastening may not be applied.

Furthermore, even with the above-mentioned simple earth retaining method, it is necessary to use heavy equipment such as a backhoe to install the earth retaining shoring, and the work tends to be large-scale.

Furthermore, if the excavation depth is shallow and the buried pipe has a small diameter, the width of the excavation trench will naturally become narrow, and there may be cases where it is not possible to secure space within the excavation trench to install earth retaining shoring.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an earth retaining device suitable for shallow trench excavation work, which can be easily installed without using heavy equipment, and can be installed even if the width of the excavation trench is narrow. .

The structure of the present invention that achieves the above object is as follows.

(1) The earth retaining device for shallow excavated trenches according to claim 1 includes a pair of plate-like members that are locked to the upper edge of the excavated groove, and a telescopic and removable earth retaining device that is installed between the pair of plate-like members. Consisting of a flexible beam material, an inner plate provided on the excavation groove side of the plate member and parallel to the longitudinal direction of the plate member, and a support plate provided between both ends of the plate member and the inner plate. .

(2) The earth retaining device for shallow excavated trenches according to claim 2 is configured by extending the support plate downward from the plate-like member in the invention according to claim 1.

(3) The earth retaining device for shallow excavated trenches according to claim 3 is configured by providing a partition plate between the inner plate and the plate-like member in the invention according to claim 1 or claim 2.

(4) The earth retaining device for a shallow excavated trench according to claim 4 is configured by extending the partition wall plate to a lower part than the plate-like member in the invention according to claim 3.

How the present invention configured as described above functions and solves the problems will be outlined with reference to the drawings. In each figure, U means upward, D means downward, R means rightward, and L means leftward.

As shown in FIGS. 2 and 3, the earth retaining device 100 for shallow excavated trenches according to the present invention includes a pair of plate-like members 10, a telescopic and removable beam installed between the plate-like members 10, and a removable beam. material 20, an inner plate 30 provided on the excavated groove 1 side of the plate member 20 and parallel to the longitudinal direction of the plate member 20, and a support plate 40 provided between both ends of the plate member and the inner plate. , the main component is a partition plate 50 provided between the inner plate 30 and the plate-like member 10.

A method for installing the earth retaining device 100 for shallow excavated trenches in the excavated trench 1 will be outlined using drawings. As shown in FIG. 2, first, a pair of plate-like members 20 are placed on the ground G near the excavated groove 1. Thereafter, the beam material 20 is attached and fixed between the opposing plate members 20. Finally, as shown in FIGS. 1 and 4, the sheet piles 2 are fitted into the space between the inner plate 30 and the plate-like member 10 to complete the earth retaining device 100 for shallow excavated trenches serving as shoring. .

Since each member is installed and fixed individually in this way, the weight is not so large, and therefore it can be easily installed manually without using a backhoe or the like.

Further, as shown in FIG. 3, there are cases where the earth retaining device 100 for shallow excavated trenches is assembled on the ground and then installed in the excavated trench, but even in this case, the sheet piles etc. are installed after the earth retaining device 100 for shallow excavated trenches is installed. , because it is fitted in, that is, the weight of the sheet pile is not added at the time of installation, so it can be installed manually.

In addition, unlike the earth retaining shoring using steel sheet piles, the work of arranging steel sheet piles and installing uprights along each steel sheet pile is not necessary, and there is an advantage that work efficiency is improved. That is, according to the present invention, since the plate-like member 10 and the inner plate 30 perform the same function as an upright, there is no need to take the trouble to install a upright to support sheet piles and the like.

Furthermore, since the plate-like member 10, which has the same effect as raising the ground, is installed on the ground and is not located on the side of the excavation groove such as a sheet pile, in other words, raising the plate on the side of the excavation groove as in the conventional example is not possible. Since there are no overhanging parts, a large working space is available, and installation is possible even if the width of the excavation trench is narrow.

Further, in the inventions according to claims 2 and 4, the support plate 40 and the partition plate 50 are provided to extend below the plate-like member 10, as shown in FIGS. 2 and 3. With this structure, the support plate 40 and the bulkhead plate 50 are pressed against the wall surface of the excavation groove by the struts 20, making it easier to install and fix the earth retaining device 100 for shallow excavation grooves in the excavation groove 100. It will become strong.

A plan view showing the state of use of the present invention Same, front view Perspective view of the invention A perspective view showing the state of use of the present invention A perspective view of the assembled plate-like members, inner plates, etc. Perspective view of beam material Perspective view showing a conventional example Perspective view showing a conventional example

Preferred embodiments of the invention will be outlined below with reference to the drawings. Note that the embodiments of the constituent elements of the present invention are not limited to the embodiments described below, and may take various forms as long as they fall within the technical scope of the present invention.

As shown in FIG. 3, the earth retaining device 100 for shallow excavated trenches according to the present invention includes a pair of plate-like members 10, a telescopic and removable beam member 20 installed between the pair of plate-like members 10, , an inner plate 30 provided on the excavated groove side of the plate member 10 and parallel to the longitudinal direction of the plate member 10, and a support plate 40 provided between both ends of the plate member 10 and the inner plate 30. Furthermore, in the invention described in claims 3 and 4, a partition plate 50 is provided between the inner plate 30 and the plate-like member 10.

A retaining material such as a sheet pile or a panel is fitted into the gap 60 existing between the inner plate 30 and the plate member 10.

As shown in FIG. 5, the plate member 10 is formed by providing an L-shaped bent plate 12 near the upper and lower ends of a flat plate-like upright plate 11. The upright plate 11 and the plate material 12 may be made of steel and welded together, but they may also be made of aluminum by extrusion molding to reduce weight.

A pair of brackets 13 are provided at both longitudinal ends of the upright board 11 in the vertical direction. The bracket 13 is a member for fixing the beam material 20. After overlapping a hole 13a provided in the bracket 13 with holes 21a and 22a provided in the beam material 20, which will be described later, the pin 23 is inserted and the beam material 20 is fixed. It has a structure in which the material 20 is fixed. In other words, the beam member 20 is removably attached to the plate member 10.

On the excavation groove side of the plate member 10, that is, on the excavation groove 101 side when the shallow excavation ditch earth retaining device 100 shown in FIG. A plate 30 is provided.

The inner plate 30 and the plate-like member 10 are fixed with a gap 60 between them by support plates 40 provided between both ends of the plate-like member 10 and the inner plate 30. If the partition plate 50 is not provided between the pair of support plates 40, it becomes possible to fit a wide panel material into the gap 60, and conversely, as in the invention described in claims 3 and 4, a plurality of partition plates 50 can be provided. If provided, it becomes possible to fit a plurality of narrow sheet piles.

The support plate 40 and the partition plate 50 are formed using hollow square pipe material. In the invention described in claim 2 or claim 4, as shown in FIGS. 2 and 3, the support plate 40 and the partition plate 50 are provided to extend below the plate-like member 10.

As shown in FIG. 6, the beam 20 is made up of two rectangular pipes of different sizes, and has a structure in which a small pipe 22 can be accommodated in a large pipe 21. Due to this structure, the beam member 20 can be expanded and contracted. Further, the pipe material 21 and the pipe material 22 are provided with a plurality of holes 21a and a plurality of holes 22a, respectively. By overlapping the holes 21a and 22a and inserting the pin 23, it is possible to fix the beam 20 to any length.

10... Plate member 11... Standing board 12... Plate material 13... Bracket 13a... Hole 20... Beam material 21... Pipe material 22... Pipe material 23... Pin 30... Inner plate 40... Support plate 50...Partition plate 60...Gap

Claims (4)

a pair of plate-like members that are locked to the upper end edge of the excavation groove; a telescopic and removable beam member that is installed between the pair of plate-like members; and a beam member that is provided on the excavation groove side of the plate-like member; An earth retaining device for a shallow excavated trench consisting of an inner plate parallel to the longitudinal direction of a plate-shaped member and a support plate provided between both ends of the plate-shaped member and the inner plate. The earth retaining device for a shallow excavated trench according to claim 1, wherein the support plate extends below the plate-like member. The earth retaining device for a shallow excavated trench according to claim 1 or 2, wherein a partition plate is provided between the inner plate and the plate-like member. 4. The earth retaining device for shallow ditches according to claim 3, wherein the partition plate extends below the plate-like member.

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