Geogrid clamp

Abstract

The utility model provides a geogrid clamp. Specifically, the geogrid clamp comprises a first unit which comprises a first connecting piece, a first clamping plate and a first protective shell, and the first clamping plate and the first protective shell are detachably connected; the second unit comprises a second connecting piece, a second clamping plate and a second protective shell; the second clamping plate is connected with the second protective shell; the first connecting piece and the second connecting piece can be connected with the first clamping plate and the second clamping plate in a matched mode, so that the geogrid between the first clamping plate and the second clamping plate is clamped by the first clamping plate and the second clamping plate. The first clamping plate comprises a first tension part; the second clamping plate comprises a second tension part; the first tension part and the second tension part which are aligned are used for being connected with drawing equipment, and a drawing test is carried out on the geogrid. According to the technical scheme, the device has the advantages of being simple in structure, convenient to connect with the geogrid, good in overall connectivity, capable of being repeatedly used and capable of reducing the test cost.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of civil engineering, in particular to a geogrid clamp. BACKGROUND

[0002] In the reinforced soil engineering, the reinforcement-soil interface parameter is a key technical index for the internal stability analysis and engineering performance evaluation of the reinforced soil structure. The interface mechanics test of the soil and the soil filling of the geosynthetic material is an important way to study and reveal the stress and deformation law of the reinforcement-soil interface. By using the pull-out tester, the interface pull-out test between the geogrid and the soil filling can be completed, the pull-out force and the pull-out displacement of the geogrid in the soil are measured, the interaction mechanism of the geogrid and the soil in the pull-out mode is studied, and the influence of factors such as the type of the geogrid, the tensile strength, and the horizontal rib spacing on the interaction strength and deformation of the reinforcement-soil is also analyzed by comparison.

[0003] When the reinforcement-soil interface pull-out test is performed, the geogrid sample and the clamp need to be fixed to ensure that there is no relative displacement between the sample and the clamp, and then the fixed geogrid sample is arranged in the soil body, the stretching end of the clamp is led out from the joint and connected with the pull-out tester for the pull-out test. In this process, whether the clamp and the geogrid are clamped tightly and whether the soil particles interfere between the clamp and the pull-out joint are important factors affecting the accuracy of the test results. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the purpose of the present disclosure is to provide a geogrid clamp.

[0005] To achieve the above purpose, the present disclosure provides a geogrid clamp, which comprises:

[0006] a first unit comprising a first connecting piece, a first clamping plate connected detachably, and a first protective shell; and

[0007] a second unit comprising a second connecting piece, a second clamping plate, and a second protective shell; the second clamping plate is connected with the second protective shell; wherein,

[0008] the first connecting piece and the second connecting piece can cooperatively connect the first clamping plate and the second clamping plate, so as to clamp the geogrid between the first clamping plate and the second clamping plate;

[0009] the first clamping plate comprises a first tension part; the second clamping plate comprises a second tension part; the aligned first tension part and the second tension part are used to connect the pull-out equipment, and the geogrid is subjected to the pull-out test.

[0010] In some embodiments, it further comprises a first sandpaper layer and a second sandpaper layer; wherein,

[0011] The first sandpaper layer is arranged on the side of the first clamping plate away from the first protective shell; and the second sandpaper layer is arranged on the side of the second clamping plate away from the second protective shell.

[0012] In some embodiments, the first connecting member is a nut; and the second connecting member comprises a threaded rod.

[0013] The first clamping plate is provided with a first connecting hole; the second clamping plate is provided with a second connecting hole; and the threaded rod can pass through the second connecting hole and the first connecting hole to cooperate with the nut.

[0014] In some embodiments, the second connecting member further comprises a reverse clamping part; the reverse clamping part is located at the end of the threaded rod away from the nut; and the size of the reverse clamping part is greater than the size of the second connecting hole.

[0015] In some embodiments, the reverse clamping part is fixedly connected to the second protective shell.

[0016] In some embodiments, the number of the first connecting holes is multiple and arranged in an array, and the number and arrangement of the second connecting holes are the same as those of the first connecting holes.

[0017] In some embodiments, the first unit further comprises a bolt; the first clamping plate is provided with a threaded hole; and the bolt and the threaded hole are connected to the first clamping plate and the first protective shell.

[0018] In some embodiments, the first protective shell comprises a sliding rail, a sliding block and a baffle; wherein,

[0019] The sliding rail is arranged on the side of the first protective shell away from the first clamping plate; the sliding block is connected to the baffle; and the sliding block can drive the baffle to slide along the sliding rail.

[0020] In some embodiments, the number of the sliding rails is two; the two sliding rails are arranged in parallel and the extension lines of the two sliding rails are symmetrical relative to the first tensile part.

[0021] In some embodiments, the first protective shell further comprises a telescopic sponge; the telescopic sponge is arranged on the sliding rail and can be compressed with the movement of the sliding block; and the height of the telescopic sponge is the same as the height of the sliding rail.

[0022] As can be seen from the above description, the present disclosure provides a geogrid clamp comprising: a first unit comprising a first connector, a detachably connected first clamping plate, and a first protective shell; and a second unit comprising a second connector, a second clamping plate, and a second protective shell; the second clamping plate being connected to the second protective shell; wherein the first connector and the second connector are capable of cooperating to connect the first clamping plate and the second clamping plate so that the first clamping plate and the second clamping plate clamp the geogrid therebetween; the first clamping plate comprising a first tensioning portion; the second clamping plate comprising a second tensioning portion; and the aligned first tensioning portion and the second tensioning portion are used to connect to a pulling device to perform a pull-out test on the geogrid. This technical solution has the advantages of a simple structure, easy connection to the geogrid, good overall connectivity, reusability, and reduced testing costs. It is also applicable to pull-out tests on interfaces between geogrids of different types and mesh sizes and different fillers, and has a wide range of applications. In addition, the first tensioning portion and the second tensioning portion are connected to the pulling instrument to ensure that the geogrid is subjected to uniform force throughout the pull-out test. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the present disclosure or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 A side view of the overall structure of a geogrid clamp provided by an embodiment of the present disclosure is shown;

[0025] Figure 2 A top view of a geogrid clamp provided by an embodiment of the present disclosure is shown;

[0026] Figure 3 A front view of a geogrid clamp provided by an embodiment of the present disclosure is shown;

[0027] Figure 4 A layered axial view of a geogrid clamp provided by an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0029] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should have the usual meanings understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the embodiments of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative position relationships. When the absolute position of the described object changes, the relative position relationship may also change accordingly.

[0030] In related technologies, the fixtures used in pull-out tests are mostly composed of two thin but rigid steel plates, one above the other. When fixing the reinforcement, glue with high adhesion strength is often used to fill the space between the upper and lower clamps and the geogrid. After the glue solidifies, the fixture and geogrid are bonded together to ensure that there is no relative displacement between the geogrid and the fixture. This method cannot be reused, and the glue takes a certain amount of time to solidify. This makes it impossible to conduct an immediate test and cannot guarantee that the geogrid and fixture will not separate under high normal stress and large horizontal pull-out force.

[0031] Based on this, some improved technical solutions use bolts to connect the clamp to the geogrid. Holes are punched on the surface of the upper plywood, and screws are connected to the bottom surface of the lower plywood through nuts. Screws are inserted into the geogrid grid to firmly connect the geogrid to the clamp. However, when setting the screws, geogrids of different mesh sizes are not taken into account, and are only applicable to grids of one mesh size; a large number of bolts are required for fixing, and manual tightening requires multiple times, which makes the test operation inefficient; and the above methods cannot avoid the filling of soil particles between the upper plywood and the pulling joint, which leads to errors in the test results.

[0032] In view of the problems of low fixing efficiency, loose fixation and gap between the pull-out test fixture and the geogrid, the fixture and usage method in the relevant technology are not suitable. Therefore, it is necessary to innovatively design a geogrid fixture for tensile test of reinforcement-soil interface.

[0033] In view of this, the disclosed embodiments provide a geogrid clamp. Specifically, the geogrid clamp comprises a first unit including a first connecting piece, a first clamping plate connected detachably, and a first protective shell; and a second unit including a second connecting piece, a second clamping plate, and a second protective shell; the second clamping plate is connected to the second protective shell; wherein the first connecting piece and the second connecting piece can be connected to the first clamping plate and the second clamping plate to clamp the geogrid between the first clamping plate and the second clamping plate; the first clamping plate includes a first tension part; the second clamping plate includes a second tension part; the aligned first tension part and the second tension part are used to connect a pulling device to perform a pulling test on the geogrid.

[0034] The technical solution has the advantages of simple structure, convenient connection operation with the geogrid, good overall connectivity, reusability, reduced test cost, and wide application range for interface pulling tests between different types and different grid sizes of geogrids and different fillers. In addition, the first tension part and the second tension part are connected to the pulling instrument to ensure uniform stress on the geogrid during the pulling test.

[0035] To make the technical solution of the disclosure clearer and easier to understand, the geogrid clamp provided by the disclosed embodiments is described in detail below with reference to the drawings.

[0036] As shown in Figures 1 to 4 , the geogrid clamp comprises a first unit and a second unit. Further, the first unit comprises a first connecting piece 6, a first clamping plate 1 connected detachably, and a first protective shell 3. The second unit comprises a second connecting piece, a second clamping plate 2, and a second protective shell 4; the second clamping plate 2 is connected to the second protective shell 4; wherein the first connecting piece 6 and the second connecting piece can be connected to the first clamping plate 1 and the second clamping plate 2 to clamp the geogrid 5 between the first clamping plate 1 and the second clamping plate 2; the first clamping plate 1 includes a first tension part 11; the second clamping plate 2 includes a second tension part 18; the aligned first tension part 11 and the second tension part 18 are used to connect a pulling device to perform a pulling test on the geogrid 5.

[0037] The first protective shell 3 and the second protective shell 4 are used to protect the first clamping plate 1 and the second clamping plate 2 respectively, so that the first connecting piece 6 and the second connecting piece can be flexibly set to meet the needs of geogrids 5 of different specifications, thereby expanding the use range of the clamp.

[0038] Further, the first tension part 11 can be formed together with the first clamping plate 1, and the second tension part 18 can be formed together with the second clamping plate 2, so as to ensure that the tension is evenly applied to the first clamping plate 1 and the second clamping plate 2.

[0039] In some embodiments, as shown in Figure 1 , the first clamping plate 1 and the second clamping plate 2 are connected to the first connecting piece 6 and the second connecting piece respectively, and the first clamping plate 1 and the second clamping plate 2 are connected to the first protective shell 3 and the second protective shell 4 respectively. Figure 3 and Figure 4 As shown, the first connecting member 6 is a nut; the second connecting member includes a threaded rod 7; the first clamping plate 1 is provided with a first connecting hole; the second clamping plate 2 is provided with a second connecting hole; the threaded rod 7 can pass through the second connecting hole and the first connecting hole to mate with the nut 6. In this manner, the first clamping plate 1 and the second clamping plate 2 can clamp the geogrid located therebetween. Using an electric wrench, the nuts can be tightened quickly, improving test efficiency, shortening test time, and ensuring that there is no relative displacement between the geogrid and the clamp, thereby increasing the accuracy of the test results.

[0040] Optionally, the number of first connection holes can be multiple, and the multiple first connection holes can be arranged in an array, with the multiple second connection holes corresponding to the arrangement of the multiple first connection holes. In this way, geogrids of different patterns can be matched with suitable first and second connection holes. For connection holes that are not successfully matched by the geogrid, the pull-out test is not affected due to the effects of the first and second protective shells.

[0041] In some embodiments, the first connecting hole and the second connecting hole may be threaded holes.

[0042] In some alternative embodiments, the second connector further includes a latching portion 8 located at the end of the threaded rod 7 away from the nut. The latching portion 8 is larger than the second connection hole. This latching portion 8 prevents the second clamping plate 2 from moving away from the first clamping plate 1, thereby reducing the support force on the geogrid 5. Alternatively, the latching portion 8 and the threaded rod 7 may be integrally formed.

[0043] In some embodiments, the anti-clamping portion 8 is fixedly connected to the second protective shell 4. For example, the anti-clamping portion 8 can be connected to the second protective shell 4 by welding. Figure 4 Shown is a welding point 17. Optionally, the counter-clamping portion 8 can be a frustum to facilitate welding.

[0044] In some alternative embodiments, the counter-clamping portion 8 may be a trapezoidal platform, with the top surface of the trapezoidal platform connected to the threaded rod 7. The second protective shell 4 includes a housing cavity, such as a trapezoidal cavity, that cooperates with the trapezoidal platform. The counter-clamping portion 8 can be snap-fitted into the housing cavity, and the threaded rod 7 and nut 6 cooperate to achieve the connection between the second protective shell 4 and the second clamping plate 2. It should be noted that the top surface of the trapezoidal platform is the smaller of the two relatively parallel surfaces.

[0045] In some embodiments, a nut washer 9 is further included, which is disposed between the nut 6 and the first clamping plate 1. Here, the nut washer 9 can improve the connection strength between the nut 6 and the threaded rod 7 and improve the clamping effect.

[0046] In some embodiments, as Figure 1 、 Figure 3 and Figure 4 As shown, the geogrid 5 further includes a first sandpaper layer 19 and a second sandpaper layer 10. The first sandpaper layer 19 is disposed on the side of the first plywood 1 away from the first protective shell 3, and the second sandpaper layer 10 is disposed on the side of the second plywood 2 away from the second protective shell 4. The first sandpaper layer 19 and the second sandpaper layer 10 can increase the friction between the geogrid 5 and the clamp.

[0047] Optionally, the first sandpaper layer 19 and the second sandpaper layer 10 are fixed to the first plywood 1 and the second plywood 2 respectively by adhesion. It should be noted that the first sandpaper layer 19 and the second sandpaper layer 10 may wear out, so they are replaced based on the test situation to ensure that sufficient friction is provided.

[0048] Those skilled in the art will appreciate that the first sandpaper layer 19 and the second sandpaper layer 10 may be provided with through holes to facilitate the passage of the second connecting member, which is not limited in the present disclosure.

[0049] In some embodiments, as Figures 1 to 4 As shown, the first unit also includes a bolt 301; the first clamping plate 1 is provided with a threaded hole 15 (refer to Figure 4 ); The bolt 301 and the threaded hole 15 cooperate to connect the first clamping plate 1 and the first protective shell 3. Using an electric screwdriver, the bolt 301 and the threaded hole 15 can be used to simply and conveniently realize the detachable connection between the first clamping plate 1 and the first protective shell 3, which has the advantage of being quick.

[0050] Optionally, the surface of the bolt 301 is flush with the surface of the first protective shell 3. Such a structure helps to reduce the friction between the first protective shell 3 and the soil surface, thereby improving the accuracy and reliability of the test results.

[0051] In order to prevent soil particles in the soil from entering the drawing joint, a baffle 302 is provided on the first protective shell 3 in the embodiment of the present disclosure.

[0052] In some embodiments, the first protective shell 3 includes a slide rail 305, a slider 303, and a baffle 302. The slide rail 305 is disposed on a side of the first protective shell 3 away from the first clamping plate 1. The slider 303 is connected to the baffle 302 and can drive the baffle 302 to slide along the slide rail 305. For example, the slider 303 is welded to the baffle 302.

[0053] The baffle 302 is used to block soil particles from entering the drawing gap, preventing the space between the clamp and the drawing gap from being filled with soil particles, thereby preventing the friction between the soil particles and the clamp after entering the drawing gap, which interferes with the drawing test results and helps to improve the test accuracy.

[0054] Optionally, the size of the slider 303 is smaller than the width of the slide rail 305 , which helps the slider 303 to slide smoothly in the slide rail.

[0055] Furthermore, there are two slide rails 305; these two slide rails 305 are arranged in parallel, and their extension lines are symmetrical with respect to the first tensioning portion 11 and the second tensioning portion 18. This structure ensures that the movement direction of the baffle 302 is consistent with the direction of the tension during the pull-out test. Compared to a single slide rail, two slide rails further enhance the stability of the baffle 302.

[0056] To prevent soil particles from entering the slide rail 305 and affecting the sliding of the baffle 302, the first protective shell 3 provided in the embodiment of the present disclosure also includes a retractable sponge 304. The retractable sponge 304 is disposed within the slide rail 305 and can be compressed as the slider 303 moves. The height of the retractable sponge 304 is the same as the height of the slide rail 305. With this structure, the retractable sponge 304 can always fill the space in the slide rail 305 not occupied by the slider 303, thereby preventing soil particles from entering the slide rail 305.

[0057] It should be noted that each slide rail 305 may be provided with two retractable sponges 304 , which are respectively located on both sides of the slider 303 .

[0058] The following is a detailed description of the use process of the geogrid fixture for the reinforcement-soil interface pull-out test provided by the embodiment of the present disclosure.

[0059] During use, the second unit consisting of the welded second protective shell 4 and the second plywood 2 is placed flat on the flat ground, the geogrid 5 is placed in the middle of the second plywood 2, and the threaded rod 7 is placed in part of the mesh of the geogrid 5; the first plywood 1 is placed on the geogrid 5 through the threaded rod 7, the nut washer 9 is put on the threaded rod 7, and then all the connecting nuts 6 are tightened with an electric screwdriver (or electric wrench); the first protective shell 3 is placed on the upper part of the first plywood 1, and the bolts 301 are tightened to tightly connect the first protective shell 3 to the first plywood 1. It should be noted that the first sandpaper layer 19 and the second sandpaper layer 10 can be pre-bonded to the first plywood 1 and the second plywood 2, and this disclosure does not limit this.

[0060] Next, if Figure 1 As shown, the pulling equipment includes a tension rod 14 and a tension bayonet 13. The tension bayonet 13 is arranged at the end of the tension rod 14. Place the connected fixture on the lower half of the soil surface in the tension test box, adjust the position so that the first tension part 11 and the second tension part 18 are clamped in the tension bayonet 13, and align the tension bolt holes 16 of the first tension part 11 and the second tension part 18 with the holes on the tension bayonet 13, and use the tension bolts 12 to connect the first tension part 11 and the second tension part 18 to the tension bayonet 13 and the tension rod 14; then fill the upper soil, apply the normal load, turn on the pulling instrument to start the pulling test.

[0061] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples. Within the scope of the present disclosure, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present disclosure as described above, which are not provided in detail for the sake of simplicity.

[0062] The embodiments of the present disclosure are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present disclosure should be included in the scope of protection of the present disclosure.

Claims

1. A geogrid clamp, characterized in that: include: The first unit includes a first connecting member, a detachably connected first splint, and a first protective shell; as well as The second unit includes a second connecting member, a second clamping plate and a second protective shell; the second clamping plate is connected to the second protective shell; wherein, The first connecting member and the second connecting member can cooperate with each other to connect the first clamping plate and the second clamping plate, so that the first clamping plate and the second clamping plate clamp the geogrid therebetween; The first clamping plate includes a first tension portion; the second clamping plate includes a second tension portion; the aligned first tension portion and the second tension portion are used to connect a pulling device to perform a pull-out test on the geogrid.

2. The geogrid clamp according to claim 1, characterized in that: Also includes a first sandpaper layer and a second sandpaper layer; wherein, The first sandpaper layer is arranged on a side of the first plywood away from the first protective shell; the second sandpaper layer is arranged on a side of the second plywood away from the second protective shell.

3. The geogrid clamp according to claim 1, characterized in that: The first connecting member is a nut; the second connecting member includes a threaded rod; The first clamping plate is provided with a first connecting hole; the second clamping plate is provided with a second connecting hole; the threaded rod can pass through the second connecting hole and the first connecting hole to cooperate with the nut.

4. The geogrid clamp according to claim 3, characterized in that: The second connecting member further includes a reverse clamping portion; the reverse clamping portion is located at an end of the threaded rod away from the nut; and the size of the reverse clamping portion is larger than the size of the second connecting hole.

5. The geogrid clamp according to claim 4, characterized in that: The reverse clamping portion is fixedly connected to the second protective shell.

6. The geogrid clamp according to claim 3, characterized in that: The number of the first connection holes is plural and arranged in an array, and the number and arrangement of the second connection holes are the same as those of the first connection holes.

7. The geogrid clamp according to claim 1, characterized in that: The first unit further includes a bolt; the first clamping plate is provided with a threaded hole; the bolt and the threaded hole cooperate to connect the first clamping plate and the first protective shell.

8. The geogrid clamp according to claim 1, characterized in that: The first protective shell includes a slide rail, a slider and a baffle; wherein, The slide rail is arranged on a side of the first protective shell away from the first clamping plate. The slider is connected to the baffle, and the slider can drive the baffle to slide along the slide rail.

9. The geogrid clamp according to claim 8, characterized in that: There are two slide rails; the two slide rails are arranged in parallel and the extension lines of the two slide rails are symmetrical with respect to the first tension part.

10. The geogrid clamp according to claim 8, characterized in that: The first protective shell further includes a telescopic sponge, which is arranged on the slide rail and can be compressed as the slider moves. The height of the telescopic sponge is the same as the height of the slide rail.

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