JP7309026B1 - Earth retaining device for shallow excavated 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

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth retaining device for excavated trenches capable of enhancing workability, and more particularly to an earth retaining device suitable for shallow trench excavation work.

Conventionally, in excavated trenches excavated for laying underground lifeline pipes such as water supply and sewerage pipes, gas transportation pipes, communication lines and power lines, shoring is assembled to prevent the side walls from collapsing. earth retention.

More specifically, steel sheet piles are arranged along both side walls of an excavated ditch, wale members are installed horizontally along each steel sheet pile to face each other, and between the wale members By erecting struts, an excavated ditch is constructed that allows installation of buried pipes while preventing the collapse of steel sheet piles due to earth pressure.

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

In the slide rail system, as shown in FIG. 7, guide members 3 having a plurality of struts 2 installed between opposing slide rails 1 are erected in a pair of excavated grooves, and slide rails constituting each guide member 3 are installed. The earth retention of the excavated wall is performed by inserting the panel 4 over 1 space. Since the slide rail 1 is made of heavy material such as H-shaped steel, it is common to use a heavy machine such as a backhoe to tuck the guide member 3 into the excavated trench.

As shown in FIG. 8, the vertical plate system consists of two longitudinal beams 6 extending in the vertical direction parallel to each other and a plate 7 installed between these two longitudinal beams 6. A box 8, which forms panels 5 and has struts 2 attached in advance according to the excavation depth between a pair of earth retaining panels 5, is erected in the excavation ditch. In this construction method as well, since the plate 7 and the like are heavy objects, the work of erecting the box 8 into the excavated trench is usually carried out by a heavy machine such as a backhoe.

Patent Literature 1 discloses an earth retaining device and an earth retaining construction method for sequentially connecting the vertical plate type earth retaining shoring.

JP-A-2006-70437

The various earth retaining methods described above are essential for the safety of workers in excavated trenches. It may not be fastened.

In addition, even in the construction method called the simple earth retaining method, it is necessary to use heavy machinery such as a backhoe to install the earth retaining shoring, which tends to be a large-scale work.

Furthermore, if the excavation depth is shallow and the diameter of the buried pipe is small, the width of the excavated trench is naturally narrow, and there are cases where the space for installing the earth retaining shoring cannot be secured in the excavated trench.

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

The configuration of the present invention for achieving the above object is as follows.

(1) The earth retaining device for a shallow excavated trench according to claim 1 comprises a pair of plate-like members engaged with the upper edge of the excavated trench, and a telescopic and detachable plate-like member bridged between the pair of plate-like members. It is composed of a flexible beam member, an inner plate provided on the excavated groove side of the plate-like member and parallel to the longitudinal direction of the plate-like member, and a support plate provided between both ends of the plate-like member and the inner plate. .

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

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

(4) The earth retaining device for shallow excavated trenches described in claim 4 is the invention described in claim 3, wherein the partition plate is extended downward from the plate-like member.

How the present invention configured as described above works to solve 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, an earth retaining device 100 for a shallow excavated trench according to the present invention comprises a pair of plate-like members 10 and a detachable and extendable beam that is laid between the plate-like members 10. an inner plate 30 provided on the excavated groove 1 side of the plate-like member 20 and parallel to the longitudinal direction of the plate-like member 20; and a support plate 40 provided between both ends of the plate-like member and the inner plate. , a partition plate 50 provided between the inner plate 30 and the plate member 10 as a main component.

A method of installing the earth retaining device 100 for a shallow excavated trench in the excavated trench 1 will be outlined with reference to the drawings. As shown in FIG. 2, first, a pair of plate-like members 20 are placed on the ground G near the excavated trench 1 . After that, the beam members 20 are attached and fixed across the plate-like members 20 facing each other. Finally, as shown in FIGS. 1 and 4, the sheet pile 2 is fitted into the space between the inner plate 30 and the plate-like member 10 to complete the shallow excavated trench earth retaining device 100 as a shoring. .

In this way, since each member is installed and fixed individually, the weight is not so large, and therefore it can be easily installed by human power without using a backhoe or the like.

As shown in FIG. 3, there is a case where the earth retaining device 100 for shallow excavated trench is assembled on the ground and then installed in the excavated trench. Since the sheet pile is fitted in, that is, the weight of the sheet pile is not added during the installation process, manual installation is possible.

In addition, unlike the earth retaining shoring using steel sheet piles, the work of arranging steel sheet piles and installing wale members along each steel sheet pile becomes unnecessary, and there is also 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 function in the same manner as the wales, there is no need to install wales to support sheet piles or the like.

Furthermore, since the plate-shaped member 10 that has the same effect as the wale is placed on the ground and is not present on the side of the excavated groove such as a sheet pile, in other words, wale is performed on the side of the excavated groove as in the conventional example. Since there is no overhang, a large work space can be obtained, and installation is possible even if the width of the excavated trench is narrow.

Further, in the second and fourth aspects of the present invention, the support plate 40 and the partition plate 50 are provided to extend downward from the plate member 10 as shown in FIGS. With such a structure, the support plate 40 and the partition plate 50 are pressed against the wall surface of the excavated trench by the struts 20, so that the installation and fixation of the earth retaining device 100 for shallow excavated trench to the excavated trench 100 is further facilitated. It becomes strong.

The top view which shows the use condition of this invention. same, front view Perspective view of the present invention The perspective view which shows the use condition of this invention. Perspective view of a state in which plate-shaped members, inner plates, etc. are assembled Perspective view of beam Perspective view showing a conventional example Perspective view showing a conventional example

Preferred embodiments of the invention are outlined below with reference to the drawings. It should be noted that the embodiments of the constituent elements of the present invention are not limited to the following embodiments, and can take various forms as long as they fall within the technical scope of the present invention.

As shown in FIG. 3, an earth retaining device 100 for a shallow excavated trench according to the present invention comprises a pair of plate-like members 10 and a detachable beam 20 which is stretchable and detachable which is installed between the pair of plate-like members 10. , an inner plate 30 provided on the excavation groove side of the plate-like member 10 and parallel to the longitudinal direction of the plate-like member 10, and a support plate 40 provided between both ends of the plate-like member 10 and the inner plate 30. Further, according to the third and fourth aspects of the present invention, a partition plate 50 is provided between the inner plate 30 and the plate member 10 .

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

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

A pair of brackets 13 are provided vertically on both ends of the upright plate 11 in the longitudinal direction. The bracket 13 is a member for fixing the beam member 20. A hole 13a provided in the bracket 13 is overlapped with holes 21a and 22a provided in the beam member 20 described later, and then a pin 23 is inserted into the beam member. It has a structure for fixing the material 20 . That is, the beam member 20 is detachable from the plate member 10 .

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

The inner plate 30 and the plate-like member 10 are fixed with a gap 60 by a support plate 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, a wide panel material can be fitted into the gap 60. 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 a hollow rectangular pipe material. In the second and fourth aspects of the invention, 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 member 20 is composed of two rectangular pipe members of different sizes, and has a structure in which a small pipe member 22 can be accommodated in a large pipe member 21 . Because of this structure, the beam 20 can be expanded and contracted. A plurality of holes 21a and holes 22a are provided in the pipe material 21 and the pipe material 22, respectively. By inserting the pin 23 after overlapping the hole 21a and the hole 22a, it is possible to fix the beam 20 to an arbitrary length.

Reference Signs List 10 Plate-like member 11 Upright plate 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 (3)

A pair of plate-shaped members locked to the upper edge of the excavated groove, an extendable and detachable beam member bridged between the pair of plate-shaped members, and a plate-shaped member provided on the excavated groove side, An earth retaining device for a shallow excavated trench comprising an inner plate parallel to the longitudinal direction of a plate-like member and support plates provided between both ends of the plate-like member and the inner plate and extending downward from the plate-like member . 2. An earth retaining device for a shallow excavated trench according to claim 1, wherein a partition plate is provided between the inner plate and the plate member. An earth retaining device for shallow trenches according to claim 1 or 2, wherein the partition plate extends downward from the plate member.

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