JP7301203B1 - Earth retaining device for shallow excavated trenches - Google Patents

Abstract

[PROBLEMS] To be easily installed without using heavy machinery, etc., can be installed even if the width of the excavated trench is narrow, and has high strength to withstand earth pressure, and is suitable for shallow trench excavation work. Provide earth retaining devices. SOLUTION: An earth retaining device for a shallow excavated trench according to claim 1 comprises a pair of plate members constructed across the excavated trench, a frame member movable by sliding on the plate members, and opposing plate members. Each of them is composed of a pair of support plates installed between opposing frame members. [Selection drawing] Fig. 3

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth retaining device for an excavated trench that is easy to install, 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, a guide member 3 having a plurality of struts 2 installed between opposing slide rails 1 as shown in FIG. 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. 10, 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.

Therefore, the present invention can be easily installed without using heavy machinery, etc., can be installed even if the width of the excavated trench is narrow, and has a high strength that can withstand the earth pressure, and is suitable for shallow trench excavation work. An object of the present invention is to provide an earth retaining device.

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 members constructed over the excavated trench, a frame member movable by sliding on the plate members, and an opposing plate member. and a pair of support plates installed between opposing frame members.

(2) The earth retaining device for a shallow excavated trench described in claim 2 is configured in the invention described in claim 1 by providing a plurality of partition plates between a pair of support plates.

(3) The earth retaining device for shallow excavated trench described in claim 3 is the invention described in claim 1 or claim 2, and is configured by providing a fixing member for stopping the sliding of the frame member with respect to the plate member.

(4) The earth retaining device for a shallow excavated trench described in claim 4 is the invention described in claim 1 or claim 2, in which the mounting angle of the support plate to the frame member is not vertical or horizontal.

(5) The earth retaining device for a shallow excavated trench described in claim 5 is configured in the invention described in claim 3, wherein the mounting angle of the support plate to the frame member is other than vertical and horizontal.

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 members 10, a plurality of frame members 20 which are movable by sliding on the plate members 10, and a frame member 20. The main components are a pair of support plates 30 installed between them and a partition plate 40 provided between the pair of support plates 30 .

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. 8, a member A in which a pair of support plates 30 are installed over a pair of opposing frame members 20a and a member B in which a pair of support plates 30 are installed across a pair of opposing frame members 20b are prepared. . These members A and B are placed on the ground G near the upper edge of the opening of the excavated groove 101 .

Next, the plate members 10 are inserted into the frame members 20a and 20b adjacent to each other across the excavated groove 101, and then the members A and B are moved inward of the excavated groove 101. As shown in FIG. Finally, when the sheet pile 102 is inserted into the gap 31 between the pair of support plates 30, the earth retaining for the excavated trench 101 is completed as shown in FIG.

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.

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 pair of support plates 30 work in the same manner as the wales, there is no need to install the wales to support sheet piles or the like.

Furthermore, as shown in FIG. 2, the pair of support plates 30, which have the same effect as the wale, are located outside the excavated groove 101 and are not located within the excavated groove. Since the wale does not protrude on the side of the excavated groove unlike the conventional example, a wide work space can be obtained. That is, installation is possible even if the width of the excavated groove is narrow.

Moreover, in the invention of claim 2, as shown in FIGS. 1 and 3, a plurality of partition plates 40 are provided between a pair of support plates. With such a structure, rattling of the sheet pile 102 inserted into the gap 31 can be suppressed. On the other hand, it is also possible to insert a long panel into the gap 31 if the partition plate 40 is not provided.

In the third aspect of the invention, a fixing member 50 is provided for stopping the sliding of the frame member 20 with respect to the plate member 10 . Since the fixing member 50 suppresses the sliding of the frame member 20, the movement of the support plate 30 is also fixed, that is, the movement of the sheet pile 102 inserted into the gap 31 is suppressed. As a result, the sheet pile 102 effectively prevents the earth pressure on the side wall of the excavated trench and prevents the earth and sand from collapsing.

Even if the fixing member 50 is not provided, earth retention can be performed by the sheet pile 102 if the earth pressure due to the excavated trench is not large. That is, if the sheet pile 102 is driven into the bottom surface of the excavated groove and embedded, the sliding of the frame member 20 can be suppressed, and the sliding of the frame member 20 can be suppressed by friction between the plate member 10 and the frame member 20 Because it is.

In the fourth and fifth aspects of the present invention, as shown in FIG. 6, the mounting angle of the support plate 30 with respect to the frame member 20 is configured to be other than vertical and horizontal. By adopting such a structure, it is possible to install the sheet pile 102 so as to be inclined from the upper end to the lower end toward the wall surface side of the excavated groove 101 as shown in FIG. 7 . Specifically, it is possible to install the pair of sheet piles 102 in an inverted V shape. Then, it is inserted into the bottom of the excavated trench 101 at an angle other than vertical.

In such a state, when the earth and sand surrounded by the imaginary line C collapses in the direction of the arrow, the sheet pile 102 makes a circular motion around the center point E of the part supported by the support plate 30 . Then, the trajectory of the lower end of the sheet pile 102 becomes a circular arc, and it is inserted deeper into the ground as the collapsed soil presses. If so, a larger penetration effect will occur, and the earth retaining effect will be enhanced.

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. Enlarged view of the main part showing the frame material and support plate Explanatory drawing of the invention described in claim 3 Same, usage state explanatory diagram Explanatory drawing showing the installation process of the present invention 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, the shallow excavated trench earth retaining device 100 according to the present invention includes a pair of plate members 10, a pair of frame members 20 provided slidably with respect to the respective plate members 10, and the plate members 10 facing each other. and a pair of support plates 30 installed between the frame members 20 facing each other.

The plate member 10 uses a hollow aluminum square member in order to reduce the weight and improve the ease of installation.

The frame member 20 is a steel square member with a hollow portion 21 as shown in FIG. A plate member 10 is slidably inserted into the hollow portion 21 .

A pair of steel L-angles 22 are bolted to the ceiling surface of the frame member 20 , and a pair of support plates 30 are bolted to the pair of L-angles 22 . An inner plate 32 is interposed between the pair of support plates 30 to maintain the distance between the support plates 30 and to form the gap 31 . The inner plates 32 are provided at both ends of the support plate 30, as shown in FIG. For the inner plate 32, a cut steel plate may be used, or a hollow square steel pipe may be used for weight reduction.

In the second aspect of the invention, a plurality of partition plates 40 are provided between the pair of support plates 30 as shown in FIG. The partition plate 40 may be a cut steel plate, or may be a hollow square steel pipe for weight reduction.

In the third aspect of the invention, the fixing member 50 suppresses the sliding of the frame member 20 with respect to the plate member 10 . Specifically, as shown in FIGS. 2 and 3, fixing members 50 made of pins are inserted into holes 11 provided in the plate member 10 and holes (not shown) provided in the top and bottom surfaces of the L angle 22 and the frame member 20. It is fitted to suppress sliding. A plurality of holes 11 are provided so that the frame member 20 can be fixed at an arbitrary position.

As the fixing member 50, a screw, a cotter, or the like can be used in addition to the pin described above. When a screw is used as the fixing member 50, it is possible to adopt a means of providing a hole with a thread groove in the L-angle 22, the frame member 20 and the plate member 10 and screwing the screw into the hole. When using the cotter, a means of providing holes in the L angle 22, the frame member 20 and the plate member 10 and fitting the cotter into the holes can be employed.

In the fourth and fifth aspects of the present invention, the mounting angle of the support plate 30 with respect to the frame member 20 is configured to be other than vertical and horizontal. Specifically, as shown in FIG. 6, the bending angle of one L-angle 22a is smaller than 90 degrees and larger than 0 degrees, and the bending angle of the other L-angle 22b is 90 degrees. With such a structure, the mounting angle of the support plate 30 becomes other than horizontal and vertical. A reinforcing plate 23 is interposed under the L angle 22b. A reinforcing plate 33 is interposed under the support plate 30 fixed by the L angle 22b.

Reference Signs List 10 Plate member 20 Frame member 21 Cavity portion 22 L angle 22 a L angle 22 b L angle 23 Reinforcement plate 30 Support plate 31 Gap 32 Inner plate 33・Reinforcement plate 40 .. Partition plate 50 .. Fixing member

Claims (3)

A pair of plate members erected over the excavation groove,
a frame member that is slidably movable on the plate member;
a fixing member for stopping the sliding of the frame member with respect to the plate member;
a pair of support plates that are present on opposing plate members and that are installed between the opposing frame members, and are maintained at a constant distance by interposing inner plates at both ends thereof ;
An earth retaining device for a shallow excavated trench comprising: An earth retaining device for shallow excavation according to claim 1, wherein a plurality of partition plates are provided between the pair of support plates. 3. An earth retaining device for a shallow excavated trench according to claim 1 or 2, wherein the mounting angle of the support plate with respect to the frame member is other than vertical and horizontal.

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