Geocell node tensile test method

Abstract

The invention discloses an earthwork standard room node tensile test method, a device adopted by the method comprises an upper half part and a lower half part, the upper half part comprises a connecting device and a positioning pin, the lower half part comprises a base, a cross beam, a left frame and a right frame, the left frame and the right frame are slidably mounted on the cross beam, the base is fixed in the middle of the cross beam, and the cross beam is fixed in the middle of the base. Locking blocks are embedded in the left frame and the right frame, gaps allowing geocell strips to penetrate through are formed between the locking blocks and the inner walls of the frames, and locking bolts are arranged to adjust the sizes of the gaps between the locking blocks and the side walls of the frames. The upper half part is connected with an upper cross beam of the stretching equipment, the base of the lower half part is connected with a lower cross beam of the stretching equipment, a geocell strip is inserted into a gap between the locking block and the side wall of the frame, one end of a steel wire rope is connected with a node of the geocell strip, the other end of the steel wire rope is connected to a positioning pin of the upper half part, the stretching equipment is started, and the tensile test of the node of the geocell is carried out. The device is easy to operate and convenient to assemble and disassemble, and the working efficiency is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of geosynthetics, and in particular relates to a geocell node tensile test method. Background Art

[0002] Geosynthetics are made of artificially synthesized polymers and are made into various types of products. They are placed inside, on the surface, or between different soil bodies to strengthen or protect the soil. Geocell is a geosynthetics with a special three-dimensional mesh structure. It is made of long strips of high molecular polymers through different welding processes. It mainly partitions the reinforced soil through the overall strength generated by the interaction between the strips and the welding nodes, and tightly constrains the soil through the embedding effect. At the same time, the friction between the cell wall and the soil and the friction generated by the contact between the geocell layer and the upper and lower soil layers form a reinforcement body. Geocells are widely used in geotechnical engineering construction such as foundation treatment, embankments, retaining walls, and slope protection.

[0003] Nodes play an important role in the performance of geocells. In order to ensure that geocells can meet the needs of geotechnical engineering construction, it is necessary to test the tensile properties of geocell nodes. The current method of testing the tensile properties of nodes is to use a tensile device to clamp a geocell strip specimen with a node in the middle, and then apply an axial force until the specimen is damaged. When using conventional testing equipment for tensile performance testing, slippage is likely to occur between the fixture and the geocell strip specimen, resulting in inaccurate tensile performance testing of geocell nodes. Summary of the invention

[0004] The present invention provides a geocell node tensile test method to solve the problem that the existing fixture is prone to slippage between the fixture and the geocell strip sample during the geocell node tensile performance test, which affects the accuracy of the geocell node tensile performance test and further affects the application of geocells in geotechnical engineering construction such as foundation treatment, embankments, retaining walls, slope protection, etc.

[0005] The present invention is achieved through the following technical solutions:

[0006] A geocell node tensile test method, the device used in the method includes an upper part and a lower part;

[0007] The upper part includes a connecting device and a positioning pin, the positioning pin is pluggable and installed on the connecting device, and the positioning pin is used to connect one end of the wire rope;

[0008] The lower half comprises a base, a crossbeam, a left locking block, a right locking block, a locking bolt, a left frame, a right frame and a positioning bolt. The base is fixed on the crossbeam. The left frame and the right frame are both provided with an upper square hole and a lower square hole. The left frame and the right frame are slidably connected with the crossbeam through their respective lower square holes. The left locking block is installed in the upper square hole of the left frame, and the right locking block is installed in the upper square hole of the right frame. There is a gap between the left locking block and the side wall of the left frame and between the right locking block and the side wall of the right frame to allow the geocell strip to pass through; locking bolts are arranged at positions corresponding to the upper square holes on the left frame and the right frame, and the size of the gap between the locking block and the side wall of the frame is adjusted by tightening or loosening the locking bolts; positioning bolts are arranged at positions corresponding to the lower square holes on the left frame and the right frame, and the fixing relationship between the left frame and the right frame and the crossbeam is adjusted by tightening or loosening the positioning bolts, and then the distance between the left frame and the right frame is adjusted by pushing the left frame and the right frame;

[0009] Step 1: Connect the upper connecting device to the crossbeam on the stretching equipment;

[0010] Step 2: Connect the lower base to the lower crossbeam of the stretching equipment;

[0011] Step 3: According to the length of the geocell strip to be tested, adjust the distance between the left frame and the right frame on the beam, and tighten the positioning bolts to fix the positions of the left frame and the right frame;

[0012] Step 4: Insert the geocell strip with nodes to be tested into the gap between the left locking block and the left frame side wall and the gap between the right locking block and the right frame side wall, so that the node of the geocell strip is located in the middle position between the left frame and the right frame, and then tighten the locking screw to fix the geocell strip through the locking block;

[0013] Step 5: Connect one end of the wire rope to the node of the geocell strip to be tested;

[0014] Step 6: Insert the positioning pin into the upper connecting device and connect the other end of the wire rope to the positioning pin;

[0015] Step 7: Start the tensile equipment, conduct geocell node tensile test, and record the data.

[0016] In the above technical solution, the connecting device includes an upper cylindrical section and a lower cylindrical section, the diameter of the upper cylindrical section is smaller than the diameter of the lower cylindrical section, a first radial through hole is arranged on the upper cylindrical section, and a second radial through hole is arranged on the lower cylindrical section; the upper cylindrical section is used to be inserted into the mounting hole of the crossbeam on the stretching equipment, and a first pin is inserted into the first radial through hole of the upper cylindrical section to realize the connection between the connecting device and the crossbeam on the stretching equipment; the positioning pin is inserted into the second radial through hole of the lower cylindrical section.

[0017] In the above technical solution, a bottom cylindrical section is provided at the bottom of the base, and a third radial through hole is provided on the bottom cylindrical section. The bottom cylindrical section is used to insert into the mounting hole of the lower beam of the stretching equipment, and a second pin is inserted into the third radial through hole of the bottom cylindrical section, thereby realizing the connection between the base and the lower beam of the stretching equipment.

[0018] In the above technical solution, the crossbeam is in the shape of a rectangular parallelepiped, and a through-length groove is provided on its side.

[0019] In the above technical solution, the base is fixed at the middle position of the bottom of the beam.

[0020] In the above technical solution, after the test is completed, the connection between the wire rope and the positioning pin and the geocell strip is released, the locking bolt is loosened, and the geocell strip is removed; then the first pin and the second pin are pulled out to separate the geocell node tensile test device from the tensile equipment.

[0021] The advantages and beneficial effects of the present invention are:

[0022] The present invention is simple to operate, easy to load and unload, and greatly improves work efficiency. The test device effectively solves the problem of the slippage between the geocell strip and the clamp affecting the accuracy of the tensile performance test during the tensile performance test of the geocell node. The geocell strip is easy to replace during the test of the test device, which greatly improves work efficiency.

[0023] The invention has a simple structure and a low manufacturing cost, can meet the market demand for mass production, effectively reduces the investment in testing costs, and avoids material waste.

[0024] The application of this invention improves the accuracy of geocell node tensile performance testing and solves major problems in the application of geocells in geotechnical engineering construction such as foundation treatment, embankments, retaining walls, and slope protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the spatial structure of the present invention.

[0026] Figure 2 It is a schematic diagram of the structure of the upper half of the present invention.

[0027] Figure 3 It is a schematic diagram of the structure of the lower half of the present invention.

[0028] Figure 4 It is a partial enlarged schematic diagram of the nodes of geocell strips connected by wire ropes.

[0029] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with specific embodiments.

[0031] A geocell node tensile test method, wherein the device used in the method comprises an upper part and a lower part.

[0032] See attached Figure 2 , the upper part includes a connecting device 1 and a positioning pin 2; wherein the connecting device 1 includes an upper cylindrical section 1.1 and a lower cylindrical section 1.2, the diameter of the upper cylindrical section 1.1 is smaller than the diameter of the lower cylindrical section 1.2, a first radial through hole 1.11 is provided on the upper cylindrical section 1.1, and a second radial through hole 1.21 is provided on the lower cylindrical section 1.2; the upper cylindrical section 1.1 is used to insert into the mounting hole of the crossbeam on the stretching equipment, and a first pin is inserted into the first radial through hole 1.11 of the upper cylindrical section 1.1, thereby realizing the connection between the connecting device and the crossbeam on the stretching equipment; the positioning pin 2 is inserted into the second radial through hole 1.21 of the lower cylindrical section 1.2, and the positioning pin 2 is used to connect with one end of the wire rope 3.

[0033] See attached Figure 3, the lower half includes a base 9, a crossbeam 8, a left locking block 4, a right locking block 5, a locking bolt 11, a left frame 6, a right frame 7 and a positioning bolt 10, the base 9 is L-shaped, and a bottom cylindrical section 9.1 is provided at the bottom of the base 9, and a third radial through hole 9.11 is provided on the bottom cylindrical section 9.1, the bottom cylindrical section 9.1 is used to insert the mounting hole of the lower crossbeam of the stretching equipment, and a second pin is inserted into the third radial through hole 9.11 of the bottom cylindrical section 9.1, thereby realizing the connection between the base 9 and the lower crossbeam of the stretching equipment; the crossbeam 8 is a rectangular parallelepiped, and a through-length groove is provided on its side, and the base 9 is welded and fixed to the middle position of the bottom of the crossbeam 8; the left frame 6 and the right frame 7 are both "Lv"-shaped structures, that is, the left frame 6 and the right frame 7 are both provided with upper square holes and lower square holes, and the left frame and the right frame are slidably connected with the crossbeam 8 through their respective lower square holes (that is, the crossbeam 8 slides and is installed The left locking block 4 is installed in the upper square hole of the left frame 6, and the right locking block 5 is installed in the upper square hole of the right frame 7. There is a gap between the left locking block 4 and the side wall of the left frame 6 and between the right locking block 5 and the side wall of the right frame 7 to allow the geocell strip 12 to pass through; a locking bolt 11 is arranged at a position corresponding to the upper square hole on the left frame 6 and the right frame 7, and the size of the gap between the locking block and the side wall of the frame can be adjusted by tightening or loosening the locking bolt 11, thereby clamping or loosening the geocell strip 12 in the gap; a positioning bolt 10 is arranged at a position corresponding to the lower square hole on the left frame 6 and the right frame 7, and the fixing relationship between the left frame 6 and the right frame 7 and the crossbeam 8 is adjusted by tightening or loosening the positioning bolt 10, thereby adjusting the distance between the left frame 6 and the right frame 7 by pushing the left frame 6 and the right frame 7.

[0034] The geocell node tensile test method of the present invention is as follows:

[0035] Step 1: Insert the upper cylindrical section 1.1 of the upper part of the geocell node tensile test device into the mounting hole of the crossbeam on the tensile device, and insert the first pin into the first radial through hole 1.11 of the upper cylindrical section 1.1, thereby connecting the connecting device to the crossbeam on the tensile device.

[0036] Step 2: Insert the bottom cylindrical section 9.1 of the lower half of the geocell node tensile test device into the mounting hole of the lower beam of the tensile equipment, insert the second pin into the third radial through hole 9.11 of the bottom cylindrical section 9.1, and then connect the base 9 to the lower beam of the tensile equipment.

[0037] Step 3: According to the length of the geocell strip to be tested, adjust the distance between the left frame 6 and the right frame 7 on the crossbeam 8. After the adjustment is appropriate, tighten the positioning bolts 10 to fix the positions of the left frame 6 and the right frame 7.

[0038] Step 4: Insert the geocell strip with nodes to be tested into the gap between the left locking block and the left frame side wall and the gap between the right locking block and the right frame side wall (four strips will be divided at the node, two of which are inserted into the gap between the left locking block and the left frame side wall, and the other two strips are inserted into the gap between the right locking block and the right frame side wall), so that the node of the geocell strip is located in the middle position between the left frame and the right frame, and then tighten the locking screw to fix the geocell strip through the locking block.

[0039] Step 5: Connect one end of the steel wire rope 3 to the node of the geocell strip to be tested through a connector. Figure 4 A connector is sleeved at the node of the geocell strip, and then the steel wire rope 3 is passed through the top of the connector, and the steel wire rope 3 is locked with a steel wire rope buckle 22, so that the steel wire rope 3 is connected to the top of the connector.

[0040] Step six: insert the positioning pin 2 into the second radial through hole 1.21 of the lower cylindrical section 1.2 of the upper half of the geocell node tensile test device, and connect the other end of the steel wire rope 3 to the positioning pin 2.

[0041] Step 7: Start the tensile equipment, conduct geocell node tensile test, and record the data.

[0042] Step 8: After the test, release the connection between the wire rope 3, the positioning pin 2 and the geocell strip, loosen the locking bolts, and remove the geocell strip.

[0043] Step 9: Pull out the first pin and the second pin to separate the geocell node tensile test device from the tensile equipment.

[0044] The present invention is described above by way of example. It should be noted that, without departing from the core of the present invention, any simple deformation, modification or other equivalent replacement that can be made by those skilled in the art without inventive effort falls within the protection scope of the present invention.

Claims

1. A geocell node tensile test method, characterized in that: The apparatus used in the method includes an upper part and a lower part; The upper part includes a connecting device and a positioning pin, the positioning pin is pluggable and installed on the connecting device, and the positioning pin is used to connect one end of the wire rope; The lower half comprises a base, a crossbeam, a left locking block, a right locking block, a locking bolt, a left frame, a right frame and a positioning bolt. The base is fixed on the crossbeam. The left frame and the right frame are both provided with an upper square hole and a lower square hole. The left frame and the right frame are slidably connected with the crossbeam through their respective lower square holes. The left locking block is installed in the upper square hole of the left frame, and the right locking block is installed in the upper square hole of the right frame. There is a gap between the left locking block and the side wall of the left frame and between the right locking block and the side wall of the right frame to allow the geocell strip to pass through; locking bolts are arranged at positions corresponding to the upper square holes on the left frame and the right frame, and the size of the gap between the locking block and the side wall of the frame is adjusted by tightening or loosening the locking bolts; positioning bolts are arranged at positions corresponding to the lower square holes on the left frame and the right frame, and the fixing relationship between the left frame and the right frame and the crossbeam is adjusted by tightening or loosening the positioning bolts, and then the distance between the left frame and the right frame is adjusted by pushing the left frame and the right frame; Step 1: Connect the upper connecting device to the crossbeam on the stretching equipment; Step 2: Connect the lower base to the lower crossbeam of the stretching equipment; Step 3: According to the length of the geocell strip to be tested, adjust the distance between the left frame and the right frame on the beam, and tighten the positioning bolts to fix the positions of the left frame and the right frame; Step 4: Insert the geocell strip with nodes to be tested into the gap between the left locking block and the left frame side wall and the gap between the right locking block and the right frame side wall, so that the node of the geocell strip is located in the middle position between the left frame and the right frame, and then tighten the locking screw to fix the geocell strip through the locking block; Step 5: Connect one end of the wire rope to the node of the geocell strip to be tested; Step 6: Insert the positioning pin into the upper connecting device and connect the other end of the wire rope to the positioning pin; Step 7: Start the tensile equipment, conduct geocell node tensile test, and record the data.

2. The geocell node tensile test method according to claim 1, characterized in that: The connecting device includes an upper cylindrical section and a lower cylindrical section, the diameter of the upper cylindrical section is smaller than the diameter of the lower cylindrical section, a first radial through hole is arranged on the upper cylindrical section, and a second radial through hole is arranged on the lower cylindrical section; the upper cylindrical section is used to be inserted into the mounting hole of the crossbeam on the stretching equipment, and a first pin is inserted into the first radial through hole of the upper cylindrical section to realize the connection between the connecting device and the crossbeam on the stretching equipment; the positioning pin is inserted into the second radial through hole of the lower cylindrical section.

3. The geocell node tensile test method according to claim 1, characterized in that: A bottom cylindrical section is provided at the bottom of the base, and a third radial through hole is provided on the bottom cylindrical section. The bottom cylindrical section is used to insert into the mounting hole of the lower beam of the stretching equipment, and a second pin is inserted into the third radial through hole of the bottom cylindrical section, thereby realizing the connection between the base and the lower beam of the stretching equipment.

4. The geocell node tensile test method according to claim 1, characterized in that: The crossbeam is in a rectangular shape, and a through-length groove is arranged on its side.

5. The geocell node tensile test method according to claim 1, characterized in that: The base is fixed at the bottom middle position of the beam.

6. The geocell node tensile test method according to claim 1, characterized in that: After the test, release the connection between the wire rope and the positioning pin and the geocell strip, loosen the locking bolt, and remove the geocell strip; then pull out the first pin and the second pin to separate the geocell node tensile test device from the tensile equipment.

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