Prestressed concrete sheet pile bending resistance test bed

Abstract

The invention relates to the technical field of concrete sheet pile bending resistance tests, in particular to a prestressed concrete sheet pile bending resistance test bed which comprises a pair of vertical beams which are symmetrically arranged, the upper end portions of the pair of vertical beams are fixedly connected with an upper cross beam, the lower end portions of the pair of vertical beams are fixedly connected with a lower cross beam, the lower cross beam is fixedly connected with a pair of bearing frames, and the bearing frames are fixedly connected with a bearing platform. The bearing frame is provided with a fixing assembly used for bearing concrete piles in different shapes, a locking assembly used for locking the fixing assembly is arranged above the fixing assembly, and the upper cross beam is provided with a loading assembly used for applying pressure to the concrete piles. Meanwhile, the spring rod, the first elastic metal strip and the second elastic metal strip are matched to be attached to the surface of the square or round concrete pile to apply pressure to the concrete pile, so that the concrete pile is stressed uniformly, and the bending test accuracy is improved.

Description

Technical Field

[0001] The invention relates to the technical field of concrete sheet pile bending resistance test, in particular to a prestressed concrete sheet pile bending resistance test pedestal. Background Art

[0002] The bending test of prestressed concrete sheet piles is to load the sample vertically through the loading equipment, observe and record its deformation and failure process, and obtain relevant data. Finally, the obtained data is statistically analyzed to evaluate its bending performance.

[0003] The traditional bending test of prestressed concrete sheet piles is to directly load the sheet piles vertically through equipment such as jacks, observe and record their deformation and failure process, and obtain relevant data. However, this vertical loading is uneven, which affects the test results. For example, the part where the end of the jack contacts the sheet pile is of fixed size. If it squeezes a sheet pile wider than itself, the force on the sheet pile will be concentrated, causing the sheet pile to be damaged faster and failing to achieve the best test data. At the same time, when vertically loading square and round piles, it is necessary to frequently replace the load distribution beam that can match the concrete pile of that shape, which is extremely inconvenient.

[0004] In view of this, the present invention proposes a prestressed concrete sheet pile bending test pedestal to solve the above technical problems. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] A prestressed concrete sheet pile bending test pedestal, comprising a pair of vertical beams, the vertical beams being a pair and symmetrically arranged, the upper ends of the pair of vertical beams being fixedly connected to an upper cross beam, the lower ends of the pair of vertical beams being fixedly connected to a lower cross beam, the pair of vertical beams, the upper cross beam and the lower cross beam forming a U-shaped frame, a pair of bearing frames being fixedly connected to the lower cross beam, the bearing frames being provided with a fixing assembly for carrying concrete piles of different shapes, a locking assembly for locking the fixing assembly being provided above the fixing assembly, a loading assembly for applying pressure to the concrete pile being provided on the upper cross beam, the loading assembly comprising a load distribution beam, a plurality of spring rods being fixedly connected to the lower end face of the load distribution beam, a No. 1 elastic metal strip being provided below the spring rod, the No. 1 elastic metal strip connecting the lower ends of the plurality of spring rods in series.

[0007] As a preferred solution of the present invention, the fixing component includes a supporting block, which is provided in a pair and symmetrically arranged, and calibration holes are opened on adjacent surfaces of the pair of supporting blocks, wherein a center column is fixedly connected to the calibration hole in one of the supporting blocks, the center column abuts against the bottom of the calibration hole in the other supporting block, and a reset spring is nested on the center column, and the two ends of the reset spring are respectively fixedly connected to the two calibration holes in the symmetrical supporting blocks.

[0008] As a preferred solution of the present invention, a slider is fixedly connected to the lower end surface of the bearing block, a slide groove is provided below the bearing block, the slide groove is opened on the upper end surface of the bearing frame, and the slider is slidably connected in the slide groove. As a preferred solution of the present invention, the upper end surface of the bearing block is concave in shape for fitting with the concrete pile, and a rubber layer is provided on the concave surface of the bearing block.

[0009] As a preferred solution of the present invention, the locking assembly is fixedly connected to the lower end surface of the upper cross beam, and the locking assembly includes a jack, and the jack is fixedly connected to the lower end surface of the upper cross beam, and the output end of the jack is fixedly connected to a cross bar, and the lower end surface of the cross bar is fixedly connected to a push-pull rod, and a No. 1 gas collecting pipe is provided below the push-pull rod, and the No. 1 gas collecting pipe is fixedly connected to the inner wall of the vertical beam, and the lower end of the push-pull rod extends to the interior of the No. 1 gas collecting pipe and is fixedly connected to the No. 1 piston, and the No. 1 piston is slidably connected to the interior of the No. 1 gas collecting pipe, and the bottom of the No. 1 gas collecting pipe is fixedly connected to an air guide pipe, and one side of the bottom of the No. 1 gas collecting pipe is fixedly connected to an air intake hole, and a one-way valve is provided in the air intake hole, and the one-way valve can only take in air but not discharge air.

[0010] As a preferred solution of the present invention, one side of the supporting block is fixedly connected to a No. 2 gas collecting pipe, one end of the air guide pipe is fixedly connected to the upper end of the No. 2 gas collecting pipe, the interior of the No. 2 gas collecting pipe is slidably connected to a No. 2 piston, one side of the upper end of the No. 2 gas collecting pipe is fixedly connected to a pressure valve, the height of the pressure valve is always higher than the height of the No. 2 piston, the lower end of the No. 2 piston is fixedly connected to a pressure rod, and the lower end of the pressure rod is extended out of the No. 2 gas collecting pipe and fixedly connected to a pressure plate.

[0011] As a preferred solution of the present invention, the pressure plate is slidably connected to one side of the supporting block, a locking head is provided under the pressure plate, the locking head is movably connected to one side of the supporting block by a torsion spring, a fixed block is provided on one side of the locking head, the fixed block is fixedly connected to the upper end surface of the supporting frame, a plurality of limit columns are fixedly connected to the side of the fixed block, and the locking head and the limit columns cooperate.

[0012] As a preferred solution of the present invention, the lower end face of the spring rod is fixedly connected with a T-shaped bolt, the No. 1 elastic metal strip is movably connected to the spring rod through the T-shaped bolt, a support spring is nested around the T-shaped bolt, the upper end of the support spring is fixedly connected to the No. 1 elastic metal strip, and the lower end of the support spring is fixedly connected to the No. 2 elastic metal strip.

[0013] As a preferred solution of the present invention, a rubber strip is fixedly connected to the lower end surface of the second elastic metal strip.

[0014] Beneficial effects of the present invention: The present invention can improve friction through the contact between the rubber strip and the surface of the concrete pile, has an anti-skid effect, and improves the stability during loading. At the same time, the spring rod and the first elastic metal strip and the second elastic metal strip can be fitted on the surface of the square or round concrete pile to apply pressure to it, so that the concrete pile is evenly stressed and the accuracy of the bending test is improved. The first elastic metal strip and the bottom of the spring rod are movably connected by T-bolts, so that the first elastic metal strip will not collapse and separate from the bottom of the spring rod when it is bent. Then, the first elastic metal strip and the second elastic metal strip are connected by a supporting spring. The scalability of the supporting spring can increase the bending amplitude of the second elastic metal strip, thereby improving the adaptability to the concrete pile. The present invention also enables the bending test of square concrete piles and round concrete piles of different thicknesses to be performed through a fixed component. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0016] in: Figure 1 This is a schematic diagram of the overall structure of a prestressed concrete sheet pile bending test rig; Figure 2 for Figure 1 A schematic diagram of the structure enlargement in the middle; Figure 3 for Figure 1 A magnified schematic diagram of the structure at B in the middle; Figure 4 A schematic diagram of the connection structure of a loading component in a prestressed concrete sheet pile bending test rig; Figure 5 for Figure 4 A magnified schematic diagram of the structure at C in the middle; Figure 6It is a schematic diagram of the connection structure of a loading component and a fixing component in a prestressed concrete sheet pile bending test rig; Figure 7 for Figure 6 A magnified schematic diagram of the structure at D in the middle; Figure 8 It is a schematic diagram of the connection structure of the fixed components in a prestressed concrete sheet pile bending test rig; Fig. 9 for Figure 8 The enlarged schematic diagram of the structure at E in the middle; Fig.10 for Fig. 9 A magnified schematic diagram of the structure at F in the middle; In the figure: 1. Vertical beam; 2. Upper cross beam; 3. Lower cross beam; 4. Load-bearing frame; 5. Fixing assembly; 51. Carrying block; 52. Sliding block; 53. Sliding slot; 54. Center column; 55. Return spring; 56. Rubber layer; 6. Locking assembly; 61. Jack; 62. Crossbar; 63. Push-pull rod; 64. No. 1 air collecting pipe; 65. No. 1 piston; 66. Air suction hole; 67. Air guide pipe; 68. No. 2 air collecting pipe; 69. Pressure valve; 610. No. 2 piston; 611. Pressure rod; 612. Pressure plate; 613. Locking head; 614. Fixing block; 615. Limiting column; 7. Loading assembly; 71. Load distribution beam; 72. Spring rod; 73. Elastic metal strip No. 1; 74. T-bolt; 75. Support spring; 76. Elastic metal strip No. 2; 77. Rubber strip. DETAILED DESCRIPTION

[0017] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Example like Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, a prestressed concrete sheet pile bending test pedestal comprises a vertical beam 1, wherein the vertical beam 1 is a pair and symmetrically arranged, the upper ends of the pair of vertical beams 1 are fixedly connected to an upper cross beam 2, the lower ends of the pair of vertical beams 1 are fixedly connected to a lower cross beam 3, the pair of vertical beams 1, the upper cross beam 2 and the lower cross beam 3 form a U-shaped frame, the lower cross beam 3 is fixedly connected to a pair of bearing frames 4, the bearing frames 4 are provided with a fixing assembly 5 for carrying concrete piles of different shapes, the fixing assembly 5 is provided with a locking assembly 6 for locking the fixing assembly 5 above, the upper cross beam 2 is provided with a loading assembly 7 for applying pressure to the concrete pile, the loading assembly 7 comprises a load distribution beam 71, the lower end surface of the load distribution beam 71 is fixedly connected to a plurality of spring rods 72, a No. 1 elastic metal strip 73 is provided below the spring rod 72, and the No. 1 elastic metal strip 73 connects the lower ends of the plurality of spring rods 72 in series; The lower end surface of the spring rod 72 is fixedly connected with a T-shaped bolt 74, and the No. 1 elastic metal strip 73 is movably connected to the spring rod 72 through the T-shaped bolt 74. A support spring 75 is nested outside the T-shaped bolt 74. The upper end of the support spring 75 is fixedly connected to the No. 1 elastic metal strip 73, and the lower end of the support spring 75 is fixedly connected to the No. 2 elastic metal strip 76. The lower end surface of the No. 2 elastic metal strip 76 is fixedly connected with a rubber strip 77.

[0019] In the embodiment, after the jack 61 starts working, it drives the load distribution beam 71 to move toward the concrete pile, and the load distribution beam 71 drives the spring rod 72 to move downward, and the spring rod 72 drives the first elastic metal strip 73, the second elastic metal strip 76 and the rubber strip 77 to contact the concrete pile, applying downward pressure to the concrete pile.

[0020] It should be noted that the contact between the rubber strip 77 and the surface of the concrete pile can increase the friction force, have an anti-slip effect, and improve the stability during the loading process.

[0021] It should also be noted that the spring rod 72 and the No. 1 elastic metal strip 73 and the No. 2 elastic metal strip 76 can cooperate to fit on the surface of the square or round concrete pile to apply pressure thereto, so that the concrete pile is evenly stressed and the accuracy of the bending test is improved.

[0022] It should also be noted that the No. 1 elastic metal strip 73 and the bottom of the spring rod 72 are flexibly connected by a T-bolt 74, so that the No. 1 elastic metal strip 73 will not collapse and separate from the bottom of the spring rod 72 when it is bent, and then the No. 1 elastic metal strip 73 and the No. 2 elastic metal strip 76 are connected by the support spring 75. The retractability of the support spring 75 can increase the bending range of the No. 2 elastic metal strip 76, thereby improving its adaptability to concrete piles.

[0023] like Figure 1 , Figure 3 , Figure 8 and Fig. 9 As shown, the fixing assembly 5 includes a bearing block 51, and the bearing blocks 51 are provided in a pair and are symmetrically arranged. Calibration holes are opened on adjacent surfaces of the pair of bearing blocks 51, and a center column 54 is fixedly connected in the calibration hole in one of the bearing blocks 51, and the center column 54 abuts against the bottom of the calibration hole in the other bearing block 51, and a reset spring 55 is nested on the center column 54, and the two ends of the reset spring 55 are respectively fixedly connected in the two calibration holes in the symmetrical bearing blocks 51; The lower end surface of the bearing block 51 is fixedly connected with a slider 52, and a slide groove 53 is provided below the bearing block 51. The slide groove 53 is opened on the upper end surface of the bearing frame 4, and the slider 52 is slidably connected in the slide groove 53; The upper end surface of the bearing block 51 is concave, which is used to fit with the concrete pile. A rubber layer 56 is provided on the concave surface of the bearing block 51 .

[0024] In an embodiment, the concrete pile to be tested is placed on the bearing block 51. If it is a square concrete pile, both ends of the concrete pile can be directly placed on the bearing blocks 51 at both ends, and the bearing blocks 51 will not move (the thickness of the square concrete pile needs to be larger than the size of the concave surface of the bearing block 51).

[0025] When the concrete pile is round, when the two ends of the concrete pile are supported on the bearing blocks 51 at both ends, the concrete pile exerts pressure on both sides on the concave surface of the bearing block 51, causing the bearing block 51 to slide to both sides in the slide groove 53 following the slider 52, the return spring 55 is stretched, and the center column 54 plays a role of limiting protection, and finally the bearing block 51 stops sliding. At this time, the surface of the concrete pile and the rubber layer 56 on the concave surface of the bearing block 51 are in contact with each other.

[0026] It should be noted that the fixing assembly 5 can bear square concrete piles, and can also bear circular concrete piles of different thicknesses, and can bear the loads stably without sliding when loading the concrete piles.

[0027] like Figure 1 , Figure 3 , Figure 4 , Figure 8 , Fig. 9 and Fig.10As shown, the locking assembly 6 is fixedly connected to the lower end surface of the upper cross beam 2, and the locking assembly 6 includes a jack 61, and the jack 61 is fixedly connected to the lower end surface of the upper cross beam 2, and the output end of the jack 61 is fixedly connected to a cross bar 62, and the lower end surface of the cross bar 62 is fixedly connected to a push-pull rod 63, and a No. 1 gas collecting pipe 64 is arranged below the push-pull rod 63, and the No. 1 gas collecting pipe 64 is fixedly connected to the inner wall of the vertical beam 1, and the lower end of the push-pull rod 63 extends to the interior of the No. 1 gas collecting pipe 64 and is fixedly connected to the No. 1 piston 65, and the No. 1 piston 65 is slidably connected to the interior of the No. 1 gas collecting pipe 64, and the bottom of the No. 1 gas collecting pipe 64 is fixedly connected to an air guide pipe 67, and one side of the bottom of the No. 1 gas collecting pipe 64 is fixedly connected to an air intake hole 66, and a one-way valve is arranged in the air intake hole 66, and the one-way valve can only take in air but not discharge air; A No. 2 gas collecting pipe 68 is fixedly connected to one side of the bearing block 51, one end of the gas guide pipe 67 is fixedly connected to the upper end of the No. 2 gas collecting pipe 68, a No. 2 piston 610 is slidably connected inside the No. 2 gas collecting pipe 68, a pressure valve 69 is fixedly connected to one side of the upper end of the No. 2 gas collecting pipe 68, the height of the pressure valve 69 is always higher than the height of the No. 2 piston 610, a pressure rod 611 is fixedly connected to the lower end of the No. 2 piston 610, and the lower end of the pressure rod 611 extends out of the No. 2 gas collecting pipe 68 and is fixedly connected to a pressure plate 612; The pressure plate 612 is slidably connected to one side of the supporting block 51, and a locking head 613 is provided under the pressure plate 612. The locking head 613 is movably connected to one side of the supporting block 51 by a torsion spring, and a fixing block 614 is provided on one side of the locking head 613. The fixing block 614 is fixedly connected to the upper end surface of the supporting frame 4, and a plurality of limiting columns 615 are fixedly connected to the side of the fixing block 614, and the locking head 613 cooperates with the limiting columns 615.

[0028] In the embodiment, after the concrete piles are placed, the jack 61 is started, and the jack 61 drives the cross bar 62 to descend, and the cross bar 62 drives the push-pull rod 63 to drive the No. 1 piston 65 to slide downward in the No. 1 gas collecting pipe 64, and the No. 1 piston 65 fills the gas into the No. 2 gas collecting pipe 68 through the gas guide pipe 67. After the gas enters the No. 2 gas collecting pipe 68, it will push the No. 2 piston 610 to drive the pressure rod 611 to move downward, and the pressure rod 611 drives the pressure plate 612 to squeeze the locking head 613, so that the locking head 613 is buckled on the limiting column 615. At this time, the two bearing blocks 51 are limited and cannot move.

[0029] It should be noted that when the air pressure in the No. 2 air collecting pipe 68 is too high, the pressure valve 69 will be triggered to exhaust.

[0030] When the bending test is over, the jack 61 contracts, driving the cross bar 62 and the push-pull rod 63 to move upward and reset. At this time, the No. 1 piston 65 slides upward and resets in the No. 1 gas collecting pipe 64 (air intake through the air intake hole 66), and the No. 2 piston 610 in the No. 2 gas collecting pipe 68 moves upward and resets after being freed from the gas pressure, and at the same time drives the pressure rod 611 and the pressure plate 612 to leave the locking head 613. The locking head 613 rotates and resets under the drive of the torsion spring, and the two bearing blocks 51 are no longer limited. When the concrete piles are removed from the bearing blocks 51, the two bearing blocks 51 are not subject to the pressure of the concrete piles, so the reset spring 55 contracts and drives the two bearing blocks 51 to move towards each other to complete the reset.

[0031] The workflow is as follows: First, various testing instruments are arranged at appropriate positions, and then the two ends of the concrete piles to be tested are respectively mounted on the bearing blocks 51. The two ends of the square concrete pile can be directly mounted on the bearing blocks 51 at both ends. The circular concrete pile exerts pressure on both sides of the concave surface of the bearing block 51, causing the bearing block 51 to slide to both sides in the slide groove 53 following the slider 52. Finally, the bearing block 51 stops sliding. At this time, the surface of the concrete pile and the rubber layer 56 on the concave surface of the bearing block 51 are in contact with each other. When the concrete pile is placed, the jack 61 is started, and the jack 61 drives the cross bar 62 to descend, and the cross bar 62 drives the push-pull rod 63 to drive the No. 1 piston 65 to slide downward in the No. 1 gas collecting pipe 64, and the No. 1 piston 65 fills the gas into the No. 2 gas collecting pipe 68 through the gas guide pipe 67. After the gas enters the No. 2 gas collecting pipe 68, it will push the No. 2 piston 610 to drive the pressure rod 611 to move downward, and the pressure rod 611 drives the pressure plate 612 to squeeze the locking head 613, so that the locking head 613 is buckled on the limiting column 615. At this time, the two bearing blocks 51 are limited and cannot move, and the concrete pile is limited. At this time, the loading test can be started, and the jack 61 continues to drive the load distribution beam 71 to move toward the concrete pile, and the load distribution beam 71 drives the spring rod 72 to move downward, and the spring rod 72 drives the No. 1 elastic metal strip 73, the No. 2 elastic metal strip 76 and the rubber strip 77 to contact the concrete pile, exert downward pressure on the concrete pile, and at the same time, the concrete pile is detected in real time through the deployed instruments.

[0032] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A prestressed concrete sheet pile bending test pedestal, comprising a pair of vertical beams (1), wherein the vertical beams (1) are symmetrically arranged, the upper ends of the pair of vertical beams (1) are fixedly connected to an upper cross beam (2), the lower ends of the pair of vertical beams (1) are fixedly connected to a lower cross beam (3), the pair of vertical beams (1), the upper cross beam (2) and the lower cross beam (3) form a U-shaped frame, characterized in that: A pair of bearing frames (4) are fixedly connected to the lower cross beam (3), a fixing assembly (5) for bearing concrete piles of different shapes is provided on the bearing frame (4), a locking assembly (6) for locking the fixing assembly (5) is provided above the fixing assembly (5), a loading assembly (7) for applying pressure to the concrete pile is provided on the upper cross beam (2), the loading assembly (7) comprises a load distribution beam (71), a plurality of spring rods (72) are fixedly connected to the lower end surface of the load distribution beam (71), a first elastic metal strip (73) is provided below the spring rod (72), and the first elastic metal strip (73) connects the lower ends of the plurality of spring rods (72) in series.

2. The prestressed concrete sheet pile bending test pedestal as claimed in claim 1, characterized in that: The fixing assembly (5) comprises a bearing block (51), wherein a pair of the bearing blocks (51) are provided and are symmetrically arranged, and calibration holes are provided on adjacent surfaces of the pair of bearing blocks (51), wherein a central column (54) is fixedly connected to the calibration hole in one of the bearing blocks (51), and the central column (54) abuts against the bottom of the calibration hole in the other bearing block (51), and a return spring (55) is embedded in the central column (54), and the two ends of the return spring (55) are respectively fixedly connected to the two calibration holes in the symmetrical bearing blocks (51).

3. The prestressed concrete sheet pile bending test pedestal as claimed in claim 2, characterized in that: The lower end surface of the bearing block (51) is fixedly connected to a sliding block (52), a sliding groove (53) is provided below the bearing block (51), the sliding groove (53) is opened on the upper end surface of the bearing frame (4), and the sliding block (52) is slidably connected in the sliding groove (53).

4. The prestressed concrete sheet pile bending test pedestal as claimed in claim 3, characterized in that: The upper end surface of the bearing block (51) is in a concave shape and is used to fit with the concrete pile. A rubber layer (56) is provided on the concave surface of the bearing block (51).

5. The prestressed concrete sheet pile bending test pedestal as claimed in claim 4, characterized in that: The locking assembly (6) is fixedly connected to the lower end surface of the upper cross beam (2), and the locking assembly (6) comprises a jack (61), the jack (61) is fixedly connected to the lower end surface of the upper cross beam (2), the output end of the jack (61) is fixedly connected to a cross bar (62), the lower end surface of the cross bar (62) is fixedly connected to a push-pull rod (63), a first gas collecting pipe (64) is provided below the push-pull rod (63), and the first gas collecting pipe (64) is fixedly connected to the vertical On the inner wall of the beam (1), the lower end of the push-pull rod (63) extends into the interior of the No. 1 gas collecting pipe (64) and is fixedly connected to the No. 1 piston (65). The No. 1 piston (65) is slidably connected to the interior of the No. 1 gas collecting pipe (64). The bottom of the No. 1 gas collecting pipe (64) is fixedly connected to an air guide pipe (67). One side of the bottom of the No. 1 gas collecting pipe (64) is fixedly connected to an air intake hole (66). A one-way valve is provided in the air intake hole (66), and the one-way valve can only take in air but not let out air.

6. The prestressed concrete sheet pile bending test pedestal as claimed in claim 5, characterized in that: A No. 2 gas collecting pipe (68) is fixedly connected to one side of the bearing block (51), one end of the gas guide pipe (67) is fixedly connected to the upper end of the No. 2 gas collecting pipe (68), a No. 2 piston (610) is slidably connected to the interior of the No. 2 gas collecting pipe (68), a pressure valve (69) is fixedly connected to one side of the upper end of the No. 2 gas collecting pipe (68), the height of the pressure valve (69) is always higher than the height of the No. 2 piston (610), a pressure rod (611) is fixedly connected to the lower end of the No. 2 piston (610), and the lower end of the pressure rod (611) extends out of the No. 2 gas collecting pipe (68) and is fixedly connected to a pressure plate (612).

7. The prestressed concrete sheet pile bending test pedestal as claimed in claim 6, characterized in that: The pressure plate (612) is slidably connected to one side of the bearing block (51); a locking head (613) is provided below the pressure plate (612); the locking head (613) is movably connected to one side of the bearing block (51) by a torsion spring; a fixing block (614) is provided on one side of the locking head (613); the fixing block (614) is fixedly connected to the upper end surface of the bearing frame (4); a plurality of limiting columns (615) are fixedly connected to the side surface of the fixing block (614); the locking head (613) and the limiting columns (615) cooperate with each other.

8. The prestressed concrete sheet pile bending test pedestal as claimed in claim 1, characterized in that: The lower end surface of the spring rod (72) is fixedly connected with a T-shaped bolt (74); the first elastic metal strip (73) is movably connected to the spring rod (72) via the T-shaped bolt (74); a support spring (75) is nested around the periphery of the T-shaped bolt (74); the upper end of the support spring (75) is fixedly connected to the first elastic metal strip (73); and the lower end of the support spring (75) is fixedly connected to the second elastic metal strip (76).

9. The prestressed concrete sheet pile bending test pedestal as claimed in claim 8, characterized in that: A rubber strip (77) is fixedly connected to the lower end surface of the second elastic metal strip (76).

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