A test platform for simulating tunnel freezing method construction

Abstract

The application relates to the technical field of engineering construction, and discloses a test platform for simulating tunnel freezing method construction, which comprises a base and a freezing pipe, the upper end of the base is provided with a polygonal frame body, the side wall of the polygonal frame body is fixedly connected with a plurality of square frames through rectangular openings, a plurality of pressurizing mechanisms are connected in the square frames, the pressurizing mechanisms press the frozen soil samples in the polygonal frame body from multiple directions, the hardness of the soil after freezing is tested, the upper and lower ends of the polygonal frame body are both provided with cover plates, a circular opening is formed in the center of each cover plate, a clamping groove is formed in the circular opening, a positioning mechanism is installed in the clamping groove, and one of the cover plates is fixed to the upper end of the base. The test platform for simulating tunnel freezing method construction can realize the freezing requirements of various freezing tests, and can realize the pressing test on the simulated frozen layer from multiple directions, so that the test range of the simulation experiment is increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of engineering construction, in particular to a test platform for simulating tunnel freezing method construction. BACKGROUND

[0002] Under the complex environment and complex hydrogeological conditions in the city, the tunnel is not suitable for shield method and ordinary drainage method construction, and the freezing method is also a common technical means, and only a hole is drilled on the ground at the corresponding position during construction, the freezing pipe is inserted into the freezing hole, and then the refrigerant is circulated in the freezing pipe, and the soft and water-rich soil is frozen in a certain time, which is convenient for subsequent construction. Artificial ground freezing method (referred to as freezing method) has the advantages of good water sealing, high soil body reinforcement, strong adaptability, good safety, etc. and is widely used in soft soil layers such as water-rich stratum and sand layer. The freezing pipe is artificially set, and the refrigerant circulating in the freezing pipe takes away the heat in the soil body, so that the water-containing soil body forms a high-strength and good-sealing frozen soil, which plays a role in bearing load and sealing water. A frozen soil cylinder is formed around each freezing pipe, and the diameter of the frozen soil cylinder increases with time. These cylinders intersect to form a dense and closed frozen soil wall that can withstand water and soil pressure and block underground water. Under the protection of the frozen soil wall, the stratum is excavated and the lining is constructed.

[0003] At present, the speed and safety of freezing method construction depend on the freezing strength of the frozen soil layer, and different freezing times are often needed according to different soil qualities. The existing test platform for simulating tunnel freezing method construction has fixed force application direction, and the structure of the frozen soil sample after freezing is single, the applicable range is small, and the actual working conditions of freezing construction of multiple soil layers cannot be simulated. SUMMARY

[0004] (I) Technical problems solved

[0005] In view of the shortcomings of the prior art, the present application provides a test platform for simulating tunnel freezing method construction, which can simulate the freezing requirements of multiple freezing tests, and can apply pressure to the simulated frozen layer from multiple directions, thereby increasing the test range of the simulation experiment and solving the problems of the existing test platform, such as fixed force application direction, single structure of the frozen soil sample after freezing, small applicable range, and inability to simulate the actual working conditions of freezing construction of multiple soil layers.

[0006] (II) Technical solutions

[0007] In order to achieve the above-mentioned purpose, the present application provides the following technical solutions: a test platform for simulating tunnel freezing method construction, comprising a base and a freezing pipe, the upper end of the base is provided with a polygonal frame body, the side wall of the polygonal frame body is fixedly connected with a plurality of square frames through a rectangular opening, and a plurality of square frames are connected with a pressurizing mechanism;

[0008] The pressing mechanism presses the frozen soil sample in the polygonal frame from multiple directions for testing the hardness of the frozen soil;

[0009] The upper and lower ends of the polygonal frame are provided with cover plates, the centers of the two cover plates are provided with round openings, the round openings are provided with clamping grooves, and positioning mechanisms are installed in the clamping grooves, one of the cover plates is fixed at the upper end of the base, the edges of the other cover plate are fixedly connected with a plurality of corner codes, and the corner codes are fixedly connected with the upper end of the square frame through bolts;

[0010] The upper end of the base is fixedly connected with a plurality of vertical columns, and the vertical columns are fixedly connected with a first fixing ring and a second fixing ring.

[0011] Preferably, the pressing mechanism comprises a top plate, the top plate is sleeved in the square frame and fixedly connected with a plurality of uniformly distributed pressure sensors, one side of the top plate is fixedly connected with a hydraulic cylinder, one end of the hydraulic cylinder is connected with a jackscrew, the upper and lower ends of the jackscrew are provided with sliding grooves, the two sliding grooves are respectively slidably connected to the first fixing ring and the second fixing ring and are provided with positioning protrusions, and the side walls of the first fixing ring and the second fixing ring are provided with annular positioning grooves matched with the positioning protrusions.

[0012] The side wall of the jackscrew is movably connected with one end of the hydraulic cylinder through a positioning assembly, and the side wall of the jackscrew is fixedly connected with a positioning block.

[0013] Preferably, the positioning assembly comprises a positioning sleeve, the positioning sleeve is fixed on one side of the jackscrew, a guide rod is sleeved in the positioning sleeve and fixedly connected with one end of the hydraulic cylinder, a blind hole is formed in one side of the jackscrew, the blind hole is sleeved with the guide rod through a guide hole on one side, a positioning plate is arranged in the blind hole, one side of the positioning plate is fixedly connected with one end of the guide rod through a bolt, one side of the positioning plate is provided with a positioning portion, and one side of the vertical column is provided with a positioning groove matched with the positioning portion.

[0014] Preferably, opposite sides of the square frame are provided with two strip-shaped grooves, two horizontal rods are fixedly connected in the two strip-shaped grooves, springs are sleeved on the rod walls of the horizontal rods, the ends of the springs are fixedly connected with sliding sleeves, and one end of the sliding sleeve is fixedly connected with one side of the top plate.

[0015] Preferably, the side wall of the vertical column is provided with a fixing frame, the fixing frame is provided with a bending portion, the bending portion is rotatably connected with one side of the vertical column through a rotating shaft, a positioning rod is fixedly connected in the fixing frame, a first magnet is installed on the rod wall of the positioning rod, and the side wall of the vertical column is fixedly connected with a second magnet.

[0016] Preferably, the positioning mechanism comprises a first fixed plate and a second fixed plate, a rectangular opening is formed at the center of the first fixed plate and the second fixed plate, the first fixed plate is clamped in the clamping groove, a plurality of transmission rods are fixedly connected to the side wall of the first fixed plate through square holes, a plurality of rectangular openings are formed on one side of the clamping groove, square tubes are fixedly connected to the openings of the plurality of rectangular openings, and openings matched with the rectangular openings are formed on the wall of the square tubes, and displacement sensors are fixedly connected in the square tubes.

[0017] Preferably, the second fixed plate is attached to one side of the first fixed plate, a plurality of positioning holes are formed in the side wall of the second fixed plate, and the upper end of the transmission rod extends into the positioning hole through the square hole.

[0018] Preferably, one end of the cover plate is provided with a boss, and the boss is clamped with the opening edge of the polygonal frame body.

[0019] Preferably, two baffles are sleeved in the polygonal frame body, support plates are fixedly connected to the center of the opposite sides of the two baffles, and the support plates and the baffles form a T-shaped structure.

[0020] (Three) beneficial effects

[0021] Compared with the prior art, the present application provides a test platform for simulating tunnel freezing construction, which has the following beneficial effects:

[0022] 1. During the freezing test, the baffle can be used according to the requirements. When one baffle is used, the baffle divides the soil sample into a semicylindrical shape. At this time, the soil after freezing is in an arc shape. When the baffle is not used, the soil sample after freezing is in a cylindrical shape, which is similar to the structure of the frozen soil during construction. When two baffles are used, the soil sample can be divided into a strip shape, and the soil after freezing is in a block shape. Then, different directions of the pressure mechanism are selected according to the requirements to test the pressure of the soil after freezing.

[0023] 2. The pressure mechanism provided in the present application, the top column is slidingly connected to the first fixed ring and the second fixed ring through the sliding groove and the positioning protrusion, when it is necessary to change the position of the top column and the hydraulic cylinder, the fixed frame is pulled up by hand, the bending part on the fixed frame is moved to be flush with the stand and the positioning of the top column is released, at the same time, the first magnet on the fixed frame is in contact with and attracted to the second magnet on the stand, at this time, the top column can be slidingly positioned to the specified position on the first fixed ring and the second fixed ring, when the top column coincides with the stand, the fixed frame at the corresponding position is placed down to make the bending part clamp the top column, at this time, the top column can be quickly and stably positioned.

[0024] 3、The positioning mechanism is provided with a detachable cover plate, when the test is completed, the soil block is thawed for a period of time, the upper cover plate is detached, at this time, the frozen tube is taken out together with the frozen soil sample, and then, the soil sample remaining in the polygonal frame can be discharged from the rectangular opening in the surface of the first fixing plate and the second fixing plate of the lower cover plate. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 Structure diagram of the test platform for simulating tunnel freezing method construction Figure 1 ;

[0026] Figure 2 Structure diagram of the test platform for simulating tunnel freezing method construction Figure 2 ;

[0027] Figure 3 Structure diagram of the base, the first fixing ring, the second fixing ring and the polygonal frame of the test platform for simulating tunnel freezing method construction

[0028] Figure 4 Structure diagram of the base, the cover plate and the positioning mechanism of the test platform for simulating tunnel freezing method construction

[0029] Figure 5 Bottom view of the test platform for simulating tunnel freezing method construction Figure 4 ;

[0030] Figure 6 Structure diagram of the cover plate of the test platform for simulating tunnel freezing method construction

[0031] Figure 7 Bottom view of the test platform for simulating tunnel freezing method construction Figure 6 ;

[0032] Figure 8 Exploded view of the test platform for simulating tunnel freezing method construction Figure 6 ;

[0033] Figure 9 Structure diagram of the square tube, the transmission rod and the displacement sensor of the test platform for simulating tunnel freezing method construction

[0034] Figure 10 Structure diagram of the stand column, the top column and the fixing frame of the test platform for simulating tunnel freezing method construction

[0035] Figure 11This is a schematic diagram of the guide rod, positioning plate, and positioning part in a test platform for simulating tunnel freezing construction proposed in this invention;

[0036] Figure 12 This is a schematic diagram of the frame and top plate of a test platform for simulating tunnel freezing construction proposed in this invention;

[0037] Figure 13 This invention proposes an experimental platform for simulating tunnel freezing construction. Figure 2 Top view.

[0038] In the diagram: 1. Base; 2. Column; 3. First fixing ring; 4. Support plate; 5. Fixing frame; 6. Annular positioning groove; 7. Second fixing ring; 8. Cover plate; 9. Square tube; 10. Freezing tube; 11. Square frame; 12. Top plate; 13. Top column; 14. Positioning sleeve; 15. Hydraulic cylinder; 16. Polygonal frame; 17. Baffle; 18. Second fixing plate; 19. First fixing plate; 20. Boss; 21. Transmission rod; 22. Slot; 23. Displacement sensor; 24. Guide rod; 25. Positioning plate; 26. Positioning groove; 27. First magnet; 28. Second magnet; 29. ​​Positioning protrusion; 30. Positioning part; 31. Spring; 32. Sliding sleeve; 33. Crossbar; 34. Pressure sensor; 35. Slide groove. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Example 1:

[0041] See attached document Figures 1-13 A test platform for simulating tunnel freezing construction includes a base 1 and a freezing pipe 10. The upper end of the base 1 is provided with a polygonal frame 16. Two baffles 17 are fitted inside the polygonal frame 16. A support plate 4 is fixedly connected to the center of the opposite side of the two baffles 17. The support plate 4 and the baffles 17 form a T-shaped structure. Multiple square frames 11 are fixedly connected to the side wall of the polygonal frame 16 through rectangular openings. A pressurizing mechanism is connected inside each of the multiple square frames 11. The pressurizing mechanism applies pressure to the frozen soil sample inside the polygonal frame 16 from multiple directions to test the hardness of the frozen soil.

[0042] The upper and lower ends of the polygonal frame body 16 are provided with cover plates 8, the centers of the two cover plates 8 are provided with circular openings, the circular openings are provided with clamping grooves 22, and the clamping grooves 22 are provided with positioning mechanisms, one of the cover plates 8 is fixed at the upper end of the base 1, the edges of the other cover plate 8 are fixedly connected with a plurality of corner codes, the plurality of corner codes are fixedly connected with the upper end of the square frame 11 through bolts, one end of the cover plate 8 is provided with a boss 20, the boss 20 is clamped with the opening edge of the polygonal frame body 16, the upper end of the base 1 is fixedly connected with a plurality of columns 2, and the plurality of columns 2 are fixedly connected with a first fixing ring 3 and a second fixing ring 7.

[0043] In use, the freezing pipe 10 is placed in the positioning mechanism, the collected soil sample is filled in the polygonal frame body 16 and is compressed layer by layer as required, then the cover plate 8 is covered and is fixed on the square frame 11 by using the bolt, then the refrigeration system is used to circulate the refrigerant through the freezing pipe 10 to freeze the soil sample in the polygonal frame body 16, after a certain freezing time, the pressure test of the frozen soil is carried out from different directions by using the pressing mechanism, the pressure of the pressing mechanism is read by the pressure sensor 34 arranged on the pressing mechanism, and the displacement change of the displacement sensor 23 on the fixing mechanism is recorded, so that the change of the pressure can be calculated to calculate the compressive strength of the frozen soil, and the displacement of the soil under a certain pressure can be recorded by the displacement sensor 23, so that the freezing time of the frozen soil required in the tunnel freezing construction can be simulated, so that the time required for the tunnel freezing construction is reduced. Figure 13 As shown in the figure, during the freezing test, the baffle 17 can be used according to requirements, when one baffle 17 is used, the baffle 17 divides the soil sample into a semicylindrical shape, at this time, the frozen soil is in an arc shape, when the baffle 17 is not used, the frozen soil is in a cylindrical shape, which is similar to the structure of the frozen soil in construction, when two baffles 17 are used, the soil sample can be divided into a strip shape, and the frozen soil is in a block shape, then different directions of the pressing mechanism are selected according to requirements to press the frozen soil for testing.

[0044] Example 2: different from example 1;

[0045] Referring to the accompanying Figures 1-3 and Figure 12 , the pressing mechanism includes a top plate 12, the top plate 12 is sleeved in the square frame 11 and is fixedly connected with a plurality of uniformly distributed pressure sensors 34, one side of the top plate 12 is fixedly connected with a hydraulic cylinder 15, one end of the hydraulic cylinder 15 is connected with a top column 13, the upper and lower ends of the top column 13 are provided with sliding grooves 35, the two sliding grooves 35 are slidingly connected with the first fixing ring 3 and the second fixing ring 7 respectively and are provided with positioning protrusions 29, and the side walls of the first fixing ring 3 and the second fixing ring 7 are provided with annular positioning grooves 6 matched with the positioning protrusions 29;

[0046] The side wall of the top column 13 is movably connected with one end of the hydraulic cylinder 15 through a positioning assembly, the side wall of the top column 13 is fixedly connected with a positioning block, the positioning assembly comprises a positioning sleeve 14, the positioning sleeve 14 is fixed on one side of the top column 13, the hydraulic cylinder 15 is sleeved in the positioning sleeve 14 at one end and is fixedly connected with a guide rod 24, a blind hole is formed in one side of the top column 13, the blind hole is sleeved with the guide rod 24 through a guide hole on one side, a positioning plate 25 is arranged in the blind hole, one side of the positioning plate 25 is fixedly connected with one end of the guide rod 24 through a bolt, one side of the positioning plate 25 is provided with a positioning part 30, a positioning groove 26 matched with the positioning part 30 is formed in one side of the stand column 2, two strip-shaped grooves are formed in the opposite sides of the square frame 11, two horizontal rods 33 are fixedly connected in the two strip-shaped grooves, a spring 31 is sleeved on the rod wall of the horizontal rod 33, one end of the spring 31 is fixedly connected with a sliding sleeve 32, one end of the sliding sleeve 32 is fixedly connected with one side of the top plate 12, a fixed frame 5 is arranged on the side wall of the stand column 2, a bent part is arranged on the fixed frame 5, the bent part is rotatably connected with one side of the stand column 2 through a rotating shaft, a positioning rod is fixedly connected in the fixed frame 5, a first magnet 27 is arranged on the rod wall of the positioning rod, and a second magnet 28 is fixedly connected with the side wall of the stand column 2.

[0047] The positioning mechanism is arranged, the top column 13 is slidably connected on the first fixed ring 3 and the second fixed ring 7 through the sliding groove 35 and the positioning protrusion 29, when the position of the top column 13 and the hydraulic cylinder 15 needs to be changed, the fixed frame 5 is pulled up by hand, the bent part on the fixed frame 5 is moved to be flush with the stand column 2 and the positioning of the top column 13 is released, meanwhile, the first magnet 27 on the fixed frame 5 is in contact with and attracted to the second magnet 28 on the stand column 2, at this time, the top column 13 can be slid on the first fixed ring 3 and the second fixed ring 7 to a specified position, when the top column 13 coincides with the stand column 2, the fixed frame 5 at the corresponding position is put down to make the bent part clamp the top column 13, at this time, the top column 13 can be quickly and stably positioned, when the hydraulic cylinder 15 works, the output end of the hydraulic cylinder 15 is in contact with the top plate 12, under the action of the reverse force, the hydraulic cylinder 15 slides in the positioning sleeve 14 and pushes the guide rod 24 to move, when the guide rod 24 moves, the positioning plate 25 is driven to move the positioning part 30 into the positioning groove 26, at this time, the positioning part 30 and the positioning groove 26 are used to limit the top column 13, so that the top column 13 and the stand column 2 cooperate to support the hydraulic cylinder 15, and the top column 13 provides sufficient supporting force to the top plate 12 to carry out the pressure test on the frozen soil.

[0048] Example 3: different from example 1;

[0049] Referring to the drawings Figures 4-9The positioning mechanism comprises a first fixed plate 19 and a second fixed plate 18, rectangular openings are formed in the centers of the first fixed plate 19 and the second fixed plate 18, the first fixed plate 19 is clamped in the clamping groove 22, a plurality of transmission rods 21 are fixedly connected to the side wall of the first fixed plate 19 through square holes, a plurality of rectangular openings are formed in one side of the clamping groove 22, a square tube 9 is fixedly connected to the opening of each rectangular opening, an opening matched with the rectangular opening is formed in the wall of the square tube 9, a displacement sensor 23 is fixedly connected in the square tube 9, one end of the transmission rod 21 penetrates through the rectangular opening and the opening and is located at one side of the displacement sensor 23;

[0050] The second fixed plate 18 is attached to one side of the first fixed plate 19, a plurality of positioning holes are formed in the side wall of the second fixed plate 18, and the upper end of the transmission rod 21 penetrates through the square hole and extends into the positioning hole.

[0051] The positioning mechanism is used in cooperation with the first fixed plate 19 and the second fixed plate 18 to be sleeved on the freezing tube 10, when pressure is applied, the second fixed plate 18 is frozen on the surface of the soil model, and the freezing tube 10 is frozen in the soil block, when pressure is applied, the frozen soil is stressed to extrude the freezing tube 10, and the first fixed plate 19 and the second fixed plate 18 are moved when the freezing tube 10 is stressed, the transmission rod 21 is moved in the rectangular opening and the opening when the first fixed plate 19 is moved, and the transmission rod 12 is contacted with the displacement sensor when the transmission rod 12 is moved, so that the displacement sensor can be used to measure the displacement of the frozen soil block after being stressed, in addition, since the cover plate 8 is detachably connected, the cover plate 8 above can be detached after the soil block is thawed for a period of time, the freezing tube 10 and the soil sample after being frozen can be taken out at this time, and the soil sample remaining in the polygonal frame body 16 can be discharged from the rectangular openings in the surfaces of the first fixed plate 19 and the second fixed plate 18 of the lower cover plate 8.

[0052] It should be noted that the term "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such a process, method, article or apparatus. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or apparatus that includes the element.

[0053] Although embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A test platform for simulating tunnel freezing construction, comprising a base (1) and a freezing pipe (10), characterized in that: The upper end of the base (1) is provided with a polygonal frame (16), and the side wall of the polygonal frame (16) is fixedly connected with multiple square frames (11) through rectangular openings. Each of the multiple square frames (11) is connected with a pressure mechanism. The pressurizing mechanism applies pressure to the frozen soil sample inside the polygonal frame (16) from multiple directions to test the hardness of the frozen soil. The pressurizing mechanism includes a top plate (12), which is fitted inside the square frame (11) and fixedly connected to multiple evenly distributed pressure sensors (34). A hydraulic cylinder (15) is fixedly connected to one side of the top plate (12), and a top column (13) is connected to one end of the hydraulic cylinder (15). The top column (13) has grooves (35) at both the upper and lower ends. The two grooves (35) are slidably connected to the first fixed ring (3) and the second fixed ring (7) respectively and are provided with positioning protrusions (29). The side walls of the first fixed ring (3) and the second fixed ring (7) are provided with annular positioning grooves (6) that cooperate with the positioning protrusions (29). The side wall of the top column (13) is movably connected to one end of the hydraulic cylinder (15) through a positioning assembly, and a positioning block is fixedly connected to the side wall of the top column (13). The polygonal frame (16) has cover plates (8) at both the top and bottom. A circular opening is provided at the center of each cover plate (8), and a slot (22) is provided at the opening. A positioning mechanism is installed in the slot (22). One cover plate (8) is fixed to the upper end of the base (1), and multiple corner brackets are fixedly connected to the edge of the other cover plate (8). These corner brackets are fixedly connected to the upper end of the square frame (11) by bolts. The positioning mechanism includes a first fixing plate (19) and a second fixing plate (18). 8) A rectangular opening is provided at the center of each of them. The first fixing plate (19) is snapped into the slot (22). Multiple transmission rods (21) are fixedly connected to the side wall of the first fixing plate (19) through the square hole. Multiple rectangular openings are provided on one side of the slot (22). A square tube (9) is fixedly connected to the opening of each of the multiple rectangular openings. An opening that matches the rectangular opening is provided on the tube wall of the square tube (9). A displacement sensor (23) is fixedly connected inside the square tube (9). One end of the transmission rod (21) passes through the rectangular opening and the opening and is located on one side of the displacement sensor (23). The upper end of the base (1) is fixedly connected to multiple columns (2), and the multiple columns (2) are jointly fixedly connected to a first fixing ring (3) and a second fixing ring (7).

2. The test platform for simulating tunnel freezing construction according to claim 1, characterized in that: The positioning assembly includes a positioning sleeve (14), which is fixed to one side of the top column (13). One end of the hydraulic cylinder (15) is sleeved in the positioning sleeve (14) and fixedly connected to a guide rod (24). A blind hole is provided on one side of the top column (13). One side of the blind hole is sleeved with the rod wall of the guide rod (24) through a guide hole. A positioning plate (25) is provided in the blind hole. One side of the positioning plate (25) is fixedly connected to one end of the guide rod (24) by bolts. A positioning part (30) is provided on one side of the positioning plate (25). A positioning groove (26) that cooperates with the positioning part (30) is provided on one side of the column (2).

3. The test platform for simulating tunnel freezing construction according to claim 1, characterized in that: Two strip grooves are opened on opposite sides of the frame (11), and a crossbar (33) is fixedly connected in each of the two strip grooves. A spring (31) is sleeved on the wall of the crossbar (33), and a sliding sleeve (32) is fixedly connected to one end of the spring (31). One end of the sliding sleeve (32) is fixedly connected to one side of the top plate (12).

4. The test platform for simulating tunnel freezing construction according to claim 1, characterized in that: The side wall of the column (2) is provided with a fixing frame (5), the fixing frame (5) is provided with a bending part, the bending part is rotatably connected to one side of the column (2) through a rotating shaft, a positioning rod is fixedly connected inside the fixing frame (5), a first magnet (27) is installed on the rod wall of the positioning rod, and a second magnet (28) is fixedly connected to the side wall of the column (2).

5. The test platform for simulating tunnel freezing construction according to claim 1, characterized in that: The second fixing plate (18) is attached to one side of the first fixing plate (19). The side wall of the second fixing plate (18) is provided with multiple positioning holes. The upper end of the transmission rod (21) passes through the square hole and extends into the positioning hole.

6. The test platform for simulating tunnel freezing construction according to claim 1, characterized in that: One end of the cover plate (8) is provided with a boss (20), which is engaged with the opening edge of the polygonal frame (16).

7. The test platform for simulating tunnel freezing construction according to claim 1, characterized in that: The polygonal frame (16) is fitted with two baffles (17). A support plate (4) is fixedly connected to the center of each side of the two baffles (17). The support plate (4) and the baffles (17) form a T-shaped structure.

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