Strength test method and strength test device for earth and sand barrier structures

Abstract

To provide a method and device for testing strength of sediment blocking structures, which allows for checking strength of sediment blocking structures through a relatively simple procedure without having to conduct a large-scale landslide experiment, and for applying a load more quantitatively compared with a method involving piling up and destroying sediment.SOLUTION: A device for testing strength of a sediment blocking structure as described in the claim 1 comprises a base unit, a rail member, and a weight.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for testing the strength of a landslide prevention structure, the method being aimed at preventing accidents resulting in injury or death to workers caused by landslides during trench excavation work or work within a trench, and to a strength testing device used for said strength testing. [Background technology]

[0002] In construction of water supply and sewerage systems involving small-scale trench excavation work, retaining supports may be installed prior to work in the trench to prevent industrial accidents caused by landslides during trench excavation and work inside the trench.

[0003] Specifically, excavation (unlined digging) is carried out using a drag shovel, after which lightweight steel sheet piles are erected so as to be attached to the excavated surface, and then wales and struts are attached to assemble the retaining support structure.

[0004] The applicant of the present application has proposed a sediment blocking device as described in Patent Document 1 in order to prevent industrial accidents associated with the above-mentioned landslides. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 6431239 DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0006] However, there is no established unified standard for the strength test method of the above-mentioned earth-retaining support structure and the earth-retaining device described in the above-mentioned Patent Document 1. This may lead to a situation where tests are performed using various methods, and if so, the obtained test results may not be absolute evaluations. In the following description, the earth-retaining device described in Patent Document 1 is referred to as the earth-retaining device. In addition, in the present invention, the earth-retaining support structure including the earth-retaining device, the panel earth-retaining device, and other earth-retaining devices are collectively referred to as the earth-retaining structure. The present invention relates to a strength test method and strength test device for the earth-retaining structures collectively referred to.

[0007] The strength test method previously used by the applicant involves piling up soil next to a soil barrier structure and allowing it to collapse naturally to check whether the soil barrier structure can withstand the load.

[0008] However, this test method has drawbacks in that it requires a large-scale device and it is difficult to apply a quantitative load.

[0009] Therefore, the present invention aims to provide a strength testing method and strength testing device for a landslide prevention structure that allows for confirmation of strength in a relatively simple manner without the need for large-scale landslide experiments, and that allows for a more quantitative load to be applied than the method of piling up and collapsing soil. [Means for solving the problem]

[0010] The present invention which achieves the above object is configured as follows.

[0011] (1) The strength testing device for an earthmoving structure according to claim 1 comprises a base portion, a rail member, and a weight.

[0012] (2) The strength testing device for earth and sand blocking structures described in claim 2 is configured in the invention described in claim 1 by using a leveling roller as a weight.

[0013] (3) The strength testing device for earth and sand blocking structures described in claim 3 is the invention described in claim 2, in which the weight of the weight is made variable by packing a weight inside the cylindrical body constituting the ground leveling roller.

[0014] (4) The method for testing the strength of a sand-blocking structure according to claim 4 is carried out by using the strength testing device according to any one of claims 1 to 3 to collide a weight against the sand-blocking structure. Effect of the Invention

[0015] How the present invention configured as described above works to solve the problems will be generally described with reference to the drawings. In each drawing, U means up, D means down, R means right, and L means left.

[0016] 2 is an explanatory diagram showing an embodiment of a strength test method for a sediment blocking structure (hereinafter referred to as a strength test method) using the strength test device for a sediment blocking structure (hereinafter referred to as a strength test device) described in claim 2 or 3. As shown in the figure, a simulated groove is reproduced between an L-shaped concrete retaining wall 2 and a base 10, and a sediment blocking device 1 is installed between them.

[0017] A rail member 20 is suspended between the left and right base portions 10, and a ground leveling roller 30 is dropped along the rail member 20 by its own weight so as to collide with the soil blocking device 1.

[0018] According to the present invention configured as described above, the weight and volume of the ground leveling roller 30 can be set in advance, and by measuring the speed of the ground leveling roller 30 at the time of collision, the energy at the time of collision can be accurately calculated.

[0019] Thus, according to the present invention, it is possible to confirm the strength by a relatively simple method, and moreover it is possible to apply a load quantitatively. [Brief description of the drawings]

[0020] [Figure 1] Perspective view of strength test device [Diagram 2] FIG. 1 is an explanatory diagram showing an embodiment of a strength test method. [Diagram 3] Graph showing the relationship between sheet tension and elapsed time [Figure 4] Graph showing the relationship between bending moment of diagonal members and elapsed time DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Preferred embodiments of the present invention will be described below with reference to the drawings. Note that the embodiments of the components of the present invention are not limited to the following embodiments, and various forms may be adopted as long as they fall within the technical scope of the present invention. In addition, the same reference numerals are used to denote common members in each claim.

[0022] 1 and 2 show the strength testing device according to claim 2 or 3. In the figures, the pedestal portion 10 is used to incline the rail member 20, and as shown in Fig. 2, there are pedestal portion 10a installed on the underside of the rail member 20 near the soil blocking device 1, and pedestal portion 10b installed on the underside of the opposite end of the rail member 20. In order to incline the rail member 20, the height of pedestal portion 10a is set lower than the height of pedestal portion 10b.

[0023] These bases 10 are made of resin pallets used in logistics and the like. The height of the bases 10 can be changed by changing the number of pallets stacked. Of course, this is just one example, and the bases 10 can be made of timber or other materials as long as they can withstand the weight during testing, and a jack can be used to make the bases 10 adjustable in height.

[0024] 1, the rail member 20 has a structure in which a pair of long steel materials 20a, 20a are fixed by a plurality of short steel materials 20b.... The steel materials 20a, 20b can be H-shaped steel or the like.

[0025] The leveling roller 30 is composed of a main body 31, which is a cylinder made of a steel plate or a stainless steel plate and filled with a weight such as concrete, and a handle 32, which is an iron pipe or the like. In the invention described in claim 3, the inside of the main body 31 is made hollow, and it is structured so that it can be filled with a heavy object to set the weight.

[0026] Furthermore, if a stopper 21, which is a protrusion, is provided at the end of the rail member 20, the leveling roller 30 can be fixed in place by engaging the handle 32 with the stopper 21, making it very easy to use.

[0027] In the invention described in claim 1, the weight is dropped by its own weight along the rail member and hits the sediment blocking structure. As the weight, a steel ball or the like can be used in addition to the above-mentioned ground leveling roller 30. Also, as the rail member, a shape that allows the weight to be dropped, for example, a steel plate with a groove, can be used.

[0028] The method for testing the strength of a sediment interception structure according to claim 4 is carried out by impacting a weight against the sediment interception structure using the strength testing device according to any one of claims 1 to 3. A specific embodiment will be described in detail below with reference to FIG.

[0029] A pedestal 10a is installed at a position 0.8 m away from a concrete L-shaped retaining wall 2, recreating a trench 3 between the two, which is intended to be an excavation trench. A soil blocking device 1 is installed in this trench 3.

[0030] The weight of the grading roller 30 is 3.1 kN and its volume is 0.196 m 3 Therefore, the unit weight is 15.72 kN / m 3 It becomes.

[0031] In the collision test, the handle 32 of the ground leveling roller 30 was engaged with the stopper 21 provided on the rail member 20. At this time, the height of the rail member 20 in contact with the ground leveling roller 30 was 0.9 m, and the total value including the diameter of the main body 31 of the ground leveling roller 30, 0.5 m, roughly coincides with the depth of the excavated trench, 1.5 m, in which the soil blocking device 1 is to be installed.

[0032] Under these conditions, the handle 32 was pushed up with a jack to release the leveling roller 30, causing it to fall under its own weight along the rail member 20 and collide with the soil blocking device 1.

[0033] At this time, by attaching strain gauges to the beam 1a and diagonal member 1b of the soil blocking device 1 using the two-side active gauge method, it becomes possible to measure the tension of the sheet 1c acting on the beam 1a and the bending moment acting on the diagonal member 1b. In addition, LED lighting for image analysis is attached to the axle portion 31a of the soil leveling roller 30, and the collision was photographed with a high-speed camera. The speed of the soil leveling roller 30 at the time of collision with the soil blocking device 1 was obtained by analyzing this captured video. This makes it possible to calculate the energy at the time of collision.

[0034] Figures 3 and 4 show the data measured under the above conditions and methods.

[0035] As shown in FIG. 3, the maximum value of the tension applied to the sheet 1c on the side where the soil leveling roller 30 collides is 6.522 kN / m.

[0036] As shown in Figure 4, the maximum bending moment of the diagonal member 1b was 1.071 kN·m on the collision side of the leveling roller 31 and 1.216 kN·m on the L-shaped retaining wall 2 side.

[0037] Although the above-mentioned embodiment relates to strength testing of a soil blocking device, if a soil retaining support structure or a panel soil retaining structure supported by a pair of panel members by a strut is installed instead of the soil blocking device, it will be possible to conduct strength testing of these support structures. [Explanation of symbols]

[0038] 10. Base 20 Rail member 21 Stopper 30. Ground leveling roller 31 Main unit 32 Handle

Claims

1. A strength testing device for conducting a strength test of a soil-blocking structure, comprising: A strength testing device for soil and sand barrier structures, comprising two base sections of different heights, a rail member for spanning the two base sections, and a weight using a ground leveling roller attached to one end of the rail member.

2. 2. The strength testing device for a soil barrier structure according to claim 1, wherein the weight of said weight bob is made variable by packing a heavy object inside a cylindrical body constituting said soil leveling roller.

3. 2. The strength testing device for a soil blocking structure according to claim 1, wherein the rail member has a stopper for retaining the soil leveling roller.

4. A method for testing the strength of a sediment-blocking structure, comprising: using the strength testing apparatus according to any one of claims 1 to 3 to drop the weight along the rail member suspended on the two pedestal portions having different heights, thereby causing the weight to collide with the sediment-blocking structure.

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