JP7397933B1 - Earth retaining device for shallow excavation trenches - Google Patents

Abstract

An object of the present invention is 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 present invention integrally forms a plate-like member that is locked to the upper end edge of an excavation groove, and a retaining plate that is provided downward from the plate-like member. Additionally, a handle was provided on the top of the plate-like member. Furthermore, a pair of earth retaining devices for shallow excavated trenches according to the present invention were placed opposite each other, and a telescopic strut was constructed across the two. [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 an excavated groove is usually performed using heavy equipment 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 machinery 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 narrower, 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 fixes a plate-like member that is locked to the upper edge of the excavated groove and an earth-retaining plate that is provided downward from the plate-like member. It has been integrated and configured.

(2) The earth retaining device for shallow excavated trenches according to claim 2 is the invention according to claim 1, in which a handle is attached to the upper part of the plate-like member.

(3) The earth retaining shoring for shallow excavated trenches according to claim 3 comprises a pair of earth retaining devices for shallow excavated trenches according to claim 1 facing each other, and the pair of opposed earth retaining devices for shallow excavated trenches. It was constructed by erecting a telescopic strut between them.

(4) The earth retaining shoring for shallow excavated trenches according to claim 4 comprises a pair of earth retaining devices for shallow excavated trenches according to claim 2 facing each other, and the pair of opposed earth retaining devices for shallow excavated trenches. It was constructed by erecting a telescopic strut between them.

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. 4 and 5, the earth retaining device 100 for shallow excavated trenches according to the present invention includes a plate-like member 10 and an earth-retaining plate 20 fixed to the plate-like member 10, thereby integrating the two. It is.

Specifically, as shown in FIG. 2, the plate-like member 10 is fixed and installed on the ground G at the upper edge of the excavated trench 101, and is installed between the facing earth retaining devices 100 for shallow excavated trenches. , a strut 40 is erected to perform earth retaining.

Since the present invention assumes a shallow excavation trench with a depth of about 1.5 meters, the length of the retaining plate 20 may be slightly more than 1.5 meters. In other words, the weight of the retaining plate 20 is light. Therefore, the earth retaining device 100 for shallow excavated trenches can be carried by hand. In particular, in the invention as claimed in claim 2, since the handle 30 is attached to the upper part of the plate-like member 10, it becomes easier to carry it by hand.

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.

Moreover, since the plate-like member 10 and the retaining plate 20 are integrated, the plate-like member 10 performs the same function as a tummy tuck. In other words, as in the case of earth retaining shoring using steel sheet piles mentioned above, there is no need to line up earth retaining boards such as sheet piles on the walls of excavated trenches and then install the uprights, which increases work efficiency. It is something.

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.

A plan view showing the state of use of the present invention Same, front view A perspective view of the invention according to claim 4 A perspective view of the invention according to claim 2 as seen from the earth retaining plate side. A perspective view of the invention according to claim 2 as seen from the plate-like member side. Perspective view of strut 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.

4 and 5 show an earth retaining device 100 for a shallow excavated trench according to a second aspect of the present invention. Plate members 10 formed of hollow square pipe materials are fixed to the upper part of earth retaining plates 20 in two stages in the vertical direction. The reason why the plate member 10 is formed of a hollow square pipe material is to reduce the weight. The material may be made of steel, but it may also be made of aluminum alloy to further reduce weight.

As shown in FIGS. 4 and 5, the retaining board 20 uses a plate material having an uneven shape similar to the hat-shaped sheet pile. With such a shape, cross-sectional performance is improved. Furthermore, since the present invention is compatible with shallow excavation trenches of about 1.5 meters, the earth pressure received is not so large, and therefore the earth retaining plate 20 can also be formed of aluminum alloy. Become. In other words, it is possible to reduce the weight of the retaining plate 20. Of course, if it is necessary to further increase the strength, the retaining plate 20 may be made of steel.

The plate member 10 and the retaining plate 20 may be fixed by bolting or welding.

In the invention as set forth in claim 2, an arcuate handle 30 is provided on the upper surface of the plate member 10. The invention according to claim 1 does not have this handle 30.

As shown in FIGS. 1 to 3, the earth retaining shoring for shallow excavated trenches according to claim 3 includes a pair of earth retaining devices 100 for shallow excavated trenches according to claim 1 facing each other. An extensible strut 40 is constructed between earth retaining devices 100 for shallow excavated trenches. Similarly, an earth retaining shoring for a shallow excavated trench according to claim 4 includes a pair of earth retaining devices 100 for a shallow excavated trench facing each other, and a pair of earth retaining devices for a shallow excavated trench that are opposed to each other. A telescopic strut 40 is installed between 100 mm.

As shown in FIG. 6, the strut 40 includes a first cylindrical body 41 having a large diameter, a second cylindrical body 42 having a smaller diameter than the first cylindrical body 41 and which can be accommodated in the first cylindrical body 41, and a first cylindrical body 42, which is also a first cylindrical body. The main component is a third cylindrical body 43 which has a smaller diameter than the body 41 and can be accommodated within the first cylindrical body 41.

The second cylindrical body 42 is provided with a plurality of holes 42a, and a pin 45 is inserted into the hole 42a (not shown) provided in the first cylindrical body 41 with the hole 42a overlapped to fix both. It is. Since a plurality of holes 42a are provided, the length of the strut 40 can be changed by changing the hole 42a into which the pin 45 is fitted.

Moreover, the outer peripheral surface of the third cylinder 43 is provided with a male thread, and the inner peripheral surface of the first cylinder 41 is provided with a female thread. The male thread and the female thread are screwed together, and because of this structure, the length of the strut 40 can be varied by rotating the first cylindrical body 41 or the third cylindrical body 43. Because of this structure, the earth retaining shoring for shallow excavated trenches according to claims 3 and 4 can be installed according to the width of the excavated trench.

A box body 44 is attached to the ends of the first cylindrical body 41 and the third cylindrical body 43. As shown in FIG. 3, by housing this box 44 in the box 11 attached to the end of the plate member 10, the strut 40 is attached to the earth retaining device 100 for a shallow excavated trench.

10... Plate member 20... Earth retaining board 30... Handle 40... Strut 41... First cylindrical body 42... Second cylindrical body 43... Third cylindrical body 44... Box body 45... pin

Claims (4)

An earth retaining system for shallow excavated trenches that fixes and integrates a plate-like member formed of a square pipe material that is secured to the upper edge of the excavated trench, and an earth-retaining plate that is provided downward from the plate-like member. Device. The earth retaining device for shallow excavated trenches according to claim 1, wherein a handle is attached to the upper part of the plate-like member. An earth retaining shoring for a shallow excavated trench, which comprises a pair of earth retaining devices for a shallow excavated trench according to claim 1, and a telescopic strut is constructed between the pair of opposed earth retaining devices for a shallow excavated trench. An earth retaining shoring for a shallow excavated trench, which comprises a pair of earth retaining devices for a shallow excavated trench according to claim 2, and a telescopic strut is constructed between the pair of opposed earth retaining devices for a shallow excavated trench.

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