Rigidity-adjustable prestressed concrete bearing plate

Abstract

The utility model provides a rigidity adjustable prestressed concrete pressure bearing plate, which comprises a rectangular concrete structure pressure bearing plate, a prestressed tension system and a power tension system, the rectangular concrete structure pressure bearing plate comprises a reinforced concrete bottom plate and a prestressed net, the prestressed net is formed by arranging a plurality of prestressed tendons in a staggered manner, and the prestressed tendons are arranged on the reinforced concrete bottom plate. The two ends of each prestressed tendon penetrate through the reinforced concrete bottom plate to be connected with the tensioning locking ends. The prestress tensioning system comprises a plurality of prestress tensioning assemblies, and the prestress tensioning assemblies are installed on the prestressed tendons between the tensioning locking ends and the reinforced concrete bottom plate. The power tensioning system comprises eight power tensioning assemblies, and each power tensioning assembly is connected with the corresponding prestress tensioning assembly located on the same side through two inhaul cables. According to the prestressed concrete bearing plate with the adjustable rigidity, in the static load test process, the prestress can be tensioned step by step along with step-by-step increase of loads, and the rigidity of the bearing plate is adjusted step by step.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure-bearing plates, in particular to a prestressed concrete pressure-bearing plate with adjustable rigidity. Background Art

[0002] With the development of cities and infrastructure, in some areas, the soil is relatively soft, the upper load is large, the bearing capacity and settlement are large, and they cannot meet the normal use requirements. Composite foundations are needed to meet the demand for foundation base pressure. The existing composite foundations mainly include sandstone pile composite foundations, rammed cement soil pile composite foundations, and lime soil pile composite foundations.

[0003] In order to ensure the quality of the project, it is necessary to conduct static load tests on the composite foundation. In the static load test, the pile diameter and pile spacing of these piles are large. In order to accurately reflect the bearing capacity of the composite foundation in the static load test of the composite foundation, a larger pressure plate is required. However, in the actual test process, the pressure plate is often deformed due to insufficient stiffness, and the actual bearing capacity of the pile foundation on the foundation soil cannot be detected, which brings great harm to the project and leaves safety hazards. If the thickness of the pressure plate is simply increased, it will cause material waste and increase the difficulty of test operation. Utility Model Content

[0004] The first purpose of the utility model is to provide a prestressed concrete pressure plate with adjustable stiffness, which is used to solve the technical problem that the pressure plate is deformed due to insufficient stiffness during the static load test of the bearing capacity of the composite foundation, thereby causing harm to the project.

[0005] The utility model provides a prestressed concrete pressure-bearing plate with adjustable rigidity, comprising:

[0006] A rectangular concrete structure bearing plate, comprising a reinforced concrete bottom plate and a prestressed mesh arranged in the reinforced concrete bottom plate, wherein the prestressed mesh is formed by staggered arrangement of a plurality of prestressed tendons, and both ends of each of the prestressed tendons pass through the reinforced concrete bottom plate and are connected to a tension locking end;

[0007] A prestressed tensioning system, comprising a plurality of prestressed tensioning components corresponding one to one with the tensioning locking end, wherein the prestressed tensioning components are installed on the prestressed tendons between the tensioning locking end and the reinforced concrete bottom plate;

[0008] The power tensioning system includes eight power tensioning components, each of which is correspondingly installed at the two ends of the four side walls of the reinforced concrete base plate, and each of the power tensioning components is connected to the prestressed tensioning components located on the same side through two cables.

[0009] According to a prestressed concrete pressure plate with adjustable stiffness provided by the utility model, four protective shells are respectively provided on the outer sides of the four side walls of the reinforced concrete bottom plate, and each of the protective shells is respectively installed on the outside of each of the prestressed tensioning components located on the same side.

[0010] According to a prestressed concrete pressure plate with adjustable stiffness provided by the utility model, the prestressed tensioning assembly comprises a left force-bearing pad, a right force-bearing pad, two left supporting legs, two right supporting legs, an inner ring annular locking petal and an annular reaction ring, one end of each of the left supporting legs is respectively provided with a left arc end head, and the other end of each of the left supporting legs is respectively provided with a left assembly block; one end of each of the right supporting legs is respectively provided with a right arc end head, and the other end of each of the right supporting legs is respectively provided with a right assembly block; two left arc grooves matching with the left arc end heads are respectively provided on the left force-bearing pad, and two right arc grooves matching with the right arc end heads are respectively provided on the right force-bearing pad; arc assembly ends are respectively provided on each of the right assembly blocks, and a left arc assembly end is provided on each of the left support legs. The left assembly block is respectively provided with arc assembly grooves adapted to the arc assembly end heads; the two left arc end heads are respectively assembled with the two left arc grooves, the two arc assembly end heads are respectively assembled with the two arc assembly grooves, and the two right arc end heads are respectively assembled with the two right arc grooves, so that a quadrilateral structure is formed between the two left supporting legs and the two right supporting legs; the annular reaction ring and the inner ring annular locking petal are respectively arranged in the quadrilateral structure, and through holes for the prestressed tendons to pass through are respectively provided on the left force-bearing pad block and the right force-bearing pad block, the annular reaction ring is sleeved on the outer side of the inner ring annular locking petal, and the inner ring annular locking petal is sleeved on the outer side of the prestressed tendons.

[0011] According to a prestressed concrete pressure plate with adjustable stiffness provided by the utility model, the left force-bearing pad is composed of two symmetrical left half pads, each of the left half pads is respectively provided with a corresponding first T-shaped slot, and the first I-shaped locking blocks are clamped in the corresponding two first T-shaped slots; the right force-bearing pad is composed of two symmetrical right half pads, each of the right half pads is respectively provided with a corresponding second T-shaped slot, and the second I-shaped locking blocks are clamped in the corresponding two second T-shaped slots.

[0012] According to a prestressed concrete pressure plate with adjustable stiffness provided by the utility model, the inner ring annular locking petal includes four arc-shaped locking petals, and the four arc-shaped locking petals can be enclosed to form a cylindrical shell structure, and a first circular barb is provided on the inner side wall of the inner ring annular locking petal; a second circular barb is provided at a position on the prestressed tendon corresponding to the inner ring annular locking petal, and the inner ring annular locking petal can be locked with the second circular barb on the prestressed tendon through the first circular barb; and an elastic retaining spring is also provided on the inner side of the annular reaction ring.

[0013] According to a prestressed concrete pressure plate with adjustable stiffness provided by the utility model, a left upper cable through hole and a left lower cable through hole are respectively provided on each of the left assembly blocks from top to bottom, and a right upper cable through hole and a right lower cable through hole are respectively provided on each of the right assembly blocks from top to bottom; the cables include a left upper cable, a left lower cable, a right upper cable and a right lower cable, the left upper cable passes through each of the left upper cable through holes respectively, and a left upper cable buckle is respectively provided on each of the left upper cables corresponding to the outer side of each of the left assembly blocks; the left lower cable passes through each of the left lower cable through holes respectively, and a left lower cable buckle is respectively provided on each of the left lower cables corresponding to the outer side of each of the left assembly blocks; the right upper cable buckle is respectively provided on each of the right upper cables corresponding to the outer side of each of the right assembly blocks; the right lower cable passes through each of the right lower cable through holes respectively, and a right lower cable buckle is respectively provided on each of the right lower cables corresponding to the outer side of each of the right assembly blocks.

[0014] According to a prestressed concrete pressure plate with adjustable stiffness provided by the utility model, the power tensioning assembly includes a fixed shaft, a cable reel sleeve, a torque amplifier and a square head bolt, one end of the fixed shaft is fixedly connected to the side wall of the reinforced concrete base plate, the cable reel sleeve is rotatably installed on the fixed shaft, one end of the torque amplifier is fixedly connected to the cable reel sleeve, and the other end of the torque amplifier is fixedly connected to the square head bolt.

[0015] According to a prestressed concrete pressure plate with adjustable stiffness provided by the utility model, the two power tensioning components located on the same side of the reinforced concrete bottom plate are set to be a first power tensioning component and a second power tensioning component, respectively, the free ends of the upper left cable and the upper right cable located on the same side are respectively wound and connected with the cable reel sleeve in the first power tensioning component, and the free ends of the lower left cable and the lower right cable located on the same side are respectively wound and connected with the cable reel sleeve in the second power tensioning component.

[0016] According to a prestressed concrete pressure plate with adjustable stiffness provided by the utility model, a low-friction prestressed channel for the prestressed tendons to pass through is provided on the reinforced concrete bottom plate, and the low-friction prestressed channel is composed of a hollow steel pipe pre-buried in the reinforced concrete bottom plate.

[0017] According to a prestressed concrete pressure plate with adjustable stiffness provided by the utility model, the prestressed mesh is formed by staggered arrangement of a plurality of transverse prestressed tendons and longitudinal prestressed tendons, and both the transverse prestressed tendons and the longitudinal prestressed tendons are tensioned steel bundles.

[0018] According to a prestressed concrete pressure plate with adjustable stiffness provided by the utility model, the torque amplifier increases the torque by rotating the square head bolt with the help of external force, thereby driving the cable reel sleeve to rotate, and the cable connected to the cable reel sleeve is tensioned; and the tensioning of the cable will drive the angle between the left supporting leg and the right supporting leg to increase, so that the prestressed tendons are tensioned.

[0019] When the prestressed tendon is stretched and becomes longer, the first circular barb on the inner ring annular locking petal can be displaced with the second circular barb on the prestressed tendon. When the difference between the two is one circle of barb, the annular reaction ring will squeeze the inner ring annular locking petal and the prestressed tendon together through the elastic retaining spring, thereby anchoring and locking the prestressed tendon through the inner ring annular locking petal.

[0020] Therefore, the prestressed concrete bearing plate with adjustable stiffness provided by the utility model has the following advantages:

[0021] 1. The prestressed concrete pressure plate with adjustable stiffness provided by the utility model has an ingenious structural design, is easy to operate, and is easy for engineering and technical personnel to operate and use;

[0022] 2. The prestressed concrete pressure plate with adjustable stiffness provided by the utility model can gradually adjust the stiffness of the pressure plate by gradually tightening the prestress as the load increases step by step during the static load test;

[0023] 3. The prestressed concrete pressure plate with adjustable stiffness provided by the utility model can reduce the installation height of the static load weight block in the static load test and reduce the safety risk;

[0024] 4. The prestressed concrete pressure plate with adjustable rigidity provided by the utility model is light in weight, convenient for transportation and hoisting, and reduces construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a front view of the prestressed concrete pressure-bearing plate with adjustable stiffness of the utility model;

[0027] Figure 2 It is an axonometric diagram of the prestressed concrete pressure-bearing plate with adjustable stiffness of the utility model;

[0028] Figure 3 This is a front view of the prestressed concrete pressure plate with adjustable stiffness according to the utility model after four protective shells are removed;

[0029] Figure 4 This is an axonometric diagram of the prestressed concrete pressure plate with adjustable stiffness according to the utility model after removing four protective shells;

[0030] Figure 5 It is a schematic diagram of the assembly of the prestressed net, the prestressed tensioning system and the dynamic tensioning system in the prestressed concrete pressure plate with adjustable stiffness of the utility model;

[0031] Figure 6 It is a structural schematic diagram of the prestressed tensioning component in the prestressed concrete pressure-bearing plate with adjustable stiffness of the utility model;

[0032] Figure 7 It is a schematic diagram of the split structure of the prestressed tensioning component in the prestressed concrete pressure-bearing plate with adjustable stiffness of the utility model;

[0033] Figure 8 The utility model is a schematic structural diagram of a dynamic tensioning component in a prestressed concrete pressure plate with adjustable stiffness.

[0034] Description of reference numerals:

[0035] 100, rectangular concrete structure pressure plate; 200, prestressed tensioning system; 300, dynamic tensioning system; 400, protective shell;

[0036] 11. Reinforced concrete base plate; 12. Prestressed tendons; 13. Tension locking end;

[0037] 2. Prestressed tensioning assembly; 21. Left force pad; 21A. Left half pad; 211. Left arc groove; 212. First T-shaped slot; 22. Right force pad; 22A. Right half pad; 221. Right arc groove; 222. Second T-shaped slot; 23. Left support leg; 231. Left arc end; 232. Left assembly block; 233. Arc assembly groove; 24. Right support leg; 241. Right arc end; 242. Right assembly block; 243. Arc assembly end; 25. Inner ring annular locking flap; 251. Arc locking flap; 26. Annular reaction ring; 27. First type locking block; 28. Second type locking block;

[0038] 3. Power tensioning assembly; 3A. First power tensioning assembly; 3B. Second power tensioning assembly; 31. Cable; 32. Fixed shaft; 33. Cable reel sleeve; 34. Torque amplifier; 35. Square head bolt. DETAILED DESCRIPTION

[0039] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0042] like Figures 1 to 8 As shown, the prestressed concrete pressure plate with adjustable stiffness according to the embodiment of the utility model comprises a rectangular concrete structure pressure plate 100 , a prestressed tensioning system 200 and a dynamic tensioning system 300 .

[0043] Among them, the rectangular concrete structure pressure plate 100 includes a reinforced concrete base plate 11 and a prestressed mesh arranged in the reinforced concrete base plate 11. The prestressed mesh is composed of a plurality of prestressed tendons 12 arranged in an alternating manner. Both ends of each prestressed tendon 12 pass through the reinforced concrete base plate 11 and are connected to the tensioning locking end 13.

[0044] The prestressed tensioning system 200 includes a plurality of prestressed tensioning components 2 corresponding one to one with the tensioning locking ends 13 , and the prestressed tensioning components 2 are installed on the prestressed tendons 12 between the tensioning locking ends 13 and the reinforced concrete bottom plate 11 .

[0045] The power tensioning system 300 includes eight power tensioning components 3, each of which is installed at the two ends of the four side walls of the reinforced concrete base plate 11, and each power tensioning component 3 is connected to each prestressed tensioning component 2 located on the same side through two cables 31.

[0046] The prestressed concrete pressure plate with adjustable stiffness in the embodiment of the utility model can tension the cable 31 through the power tensioning component 3, and the tensioning of the cable 31 can cause each prestressed tensioning component 2 to deform, and then the prestressed tendons 12 are tensioned through the deformation of each prestressed tensioning component 2. Therefore, during the static load test, the prestress can be gradually tensioned as the load increases step by step, thereby gradually adjusting the stiffness of the pressure plate.

[0047] Specifically, four protective shells 400 are provided on the outer sides of the four side walls of the reinforced concrete base plate 11 , respectively. Each protective shell 400 is installed on the outside of each prestressed tensioning component 2 located on the same side, so as to protect each prestressed tensioning component 2 .

[0048] In some embodiments of the utility model, the prestressed tensioning assembly 2 includes a left force pad 21, a right force pad 22, two left support legs 23, two right support legs 24, an inner ring annular locking petal 25 and an annular reaction ring 26. A left arc end 231 is provided at one end of each left support leg 23, and a left assembly block 232 is provided at the other end of each left support leg 23. A right arc end 241 is provided at one end of each right support leg 24, and a right assembly block 242 is provided at the other end of each right support leg 24. Two left arc grooves 211 adapted to the left arc end 231 are provided on the left force pad 21, and two right arc grooves 221 adapted to the right arc end 241 are provided on the right force pad 22. Each right assembly block 242 is provided with an arc assembly end 243, and each left assembly block 232 is provided with an arc assembly groove 233 matched with the arc assembly end 243. The two left arc ends 231 are respectively assembled with the two left arc grooves 211, the two arc assembly ends 243 are respectively assembled with the two arc assembly grooves 233, and the two right arc ends 241 are respectively assembled with the two right arc grooves 221, so that a quadrilateral structure is formed between the two left support legs 23 and the two right support legs 24. The annular reaction ring 26 and the inner annular locking petal 25 are respectively arranged in the quadrilateral structure, and through holes for the prestressed tendons 12 to pass through are respectively provided on the left force pad 21 and the right force pad 22, and the annular reaction ring 26 is sleeved on the outer side of the inner annular locking petal 25, and the inner annular locking petal 25 is sleeved on the outer side of the prestressed tendons 12. That is, the end of the prestressed tendon 12 extends from the reinforced concrete bottom plate 11 and passes through the left force pad 21, the inner ring locking petal 25 and the right force pad 22 in sequence, and then is connected to the tension locking end 13. Among them, the tension locking end 13 can conflict with the right force pad 22, and the left force pad 21 can conflict with the side wall of the reinforced concrete bottom plate 11. Due to the assembly method between the left force pad 21, the right force pad 22, the two left support legs 23 and the two right support legs 24, the angle between the left support leg 23 and the right support leg 24 can be adjusted, so that the quadrilateral structure is deformed, and then the tensioning of the prestressed tendon 12 is realized.

[0049] Specifically, the left force-bearing pad 21 is composed of two symmetrical left half pads 21A, each of which is provided with a corresponding first T-shaped slot 212, and the corresponding two first T-shaped slots 212 are provided with a first I-shaped locking block 27, thereby achieving locking between the two left half pads 21A. The right force-bearing pad 22 is composed of two symmetrical right half pads 22A, each of which is provided with a corresponding second T-shaped slot 222, and the corresponding two second T-shaped slots 222 are provided with a second I-shaped locking block 28, thereby achieving locking between the two right half pads 22A.

[0050] Specifically, the inner ring annular locking flap 25 includes four arc-shaped locking flaps 251, and the four arc-shaped locking flaps 251 can be enclosed to form a cylindrical shell structure. A plurality of first circular barbs are arranged on the inner side wall of the inner ring annular locking flap 25, and the plurality of first circular barbs are arranged in sequence along the length direction of the inner ring annular locking flap 25. A plurality of second circular barbs are arranged at the position corresponding to the inner ring annular locking flap 25 on the prestressed tendon 12, and the plurality of second circular barbs are arranged in sequence along the length direction of the prestressed tendon 12. Among them, an elastic retaining spring is also arranged on the inner side of the annular reaction ring 26, and under the action of the elastic retaining spring, the inner ring annular locking flap 25 can be locked with the second circular barb on the prestressed tendon 12 through the first circular barb.

[0051] Specifically, a left upper cable through hole and a left lower cable through hole are respectively provided on each left assembly block 232 from top to bottom, and a right upper cable through hole and a right lower cable through hole are respectively provided on each right assembly block 242 from top to bottom. The cable 31 includes a left upper cable, a left lower cable, a right upper cable and a right lower cable. The left upper cable passes through each left upper cable through hole, and a left upper cable buckle 311 is respectively provided on each left upper cable corresponding to the outer side of each left assembly block 232. The left lower cable passes through each left lower cable through hole, and a left lower cable buckle 312 is respectively provided on each left lower cable corresponding to the outer side of each left assembly block 232. A right upper cable buckle 313 is respectively provided on each right upper cable corresponding to the outer side of each right assembly block 242. The right lower cables pass through the right lower cable through holes respectively, and right lower cable buckles 314 are respectively provided on the right lower cables corresponding to the outer sides of the right assembly blocks 242 .

[0052] In some embodiments of the utility model, the power tensioning assembly 3 includes a fixed shaft 32, a cable reel sleeve 33, a torque amplifier 34 and a square bolt 35, one end of the fixed shaft 32 is fixedly connected to the side wall of the reinforced concrete bottom plate 11, the cable reel sleeve 33 is rotatably mounted on the fixed shaft 32, one end of the torque amplifier 34 is fixedly connected to the cable reel sleeve 33, and the other end of the torque amplifier 34 is fixedly connected to the square bolt 35. That is, the square bolt 35 can drive the torque amplifier 34 to rotate, and then the torque amplifier 34 increases the torque, thereby driving the cable reel sleeve 33 to rotate around the fixed shaft 32.

[0053] The two power tensioning assemblies 3 located on the same side of the reinforced concrete base plate 11 are respectively designated as the first power tensioning assembly 3A and the second power tensioning assembly 3B. The free ends of the upper left cable and the upper right cable located on the same side are respectively wound and connected with the cable reel sleeve 33 in the first power tensioning assembly 3A, and the free ends of the lower left cable and the lower right cable located on the same side are respectively wound and connected with the cable reel sleeve 33 in the second power tensioning assembly 3B.

[0054] Therefore, by applying external force to the square head bolt 35 to make it rotate, the torque amplifier 34 increases the torque, thereby driving the cable reel sleeve 33 to rotate, and the cable 31 connected to the cable reel sleeve 33 is tensioned. The tensioning of the cable 31 will drive the angle between the left support leg 23 and the right support leg 24 in each prestressed tensioning assembly 2 to increase, thereby tensioning the prestressed tendons 12.

[0055] When the prestressed tendon 12 is stretched and lengthened, the first circular barb on the inner ring annular locking petal 25 can be displaced with the second circular barb on the prestressed tendon 12. When the difference between the two is one circle of barb, the annular reaction ring 26 will squeeze the inner ring annular locking petal 25 and the prestressed tendon 12 together through the elastic retaining spring, thereby achieving anchoring and locking of the prestressed tendon 12 through the inner ring annular locking petal 25.

[0056] In some embodiments of the utility model, a low-friction prestressed channel for the prestressed tendons 12 to pass through is provided on the reinforced concrete base plate 11 , and the low-friction prestressed channel is composed of a hollow steel pipe with a smooth inner wall embedded in the reinforced concrete base plate 11 .

[0057] In some embodiments of the present invention, the prestressed mesh 12 is formed by staggered arrangement of a plurality of transverse prestressed tendons and longitudinal prestressed tendons, wherein the transverse prestressed tendons and the longitudinal prestressed tendons are tensioned steel strands.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A prestressed concrete bearing plate with adjustable stiffness, characterized in that: include: A rectangular concrete structure bearing plate, comprising a reinforced concrete bottom plate and a prestressed mesh arranged in the reinforced concrete bottom plate, wherein the prestressed mesh is formed by staggered arrangement of a plurality of prestressed tendons, and both ends of each of the prestressed tendons pass through the reinforced concrete bottom plate and are connected to a tension locking end; A prestressed tensioning system, comprising a plurality of prestressed tensioning components corresponding one to one with the tensioning locking end, wherein the prestressed tensioning components are installed on the prestressed tendons between the tensioning locking end and the reinforced concrete bottom plate; The power tensioning system includes eight power tensioning components, each of which is correspondingly installed at the two ends of the four side walls of the reinforced concrete base plate, and each of the power tensioning components is connected to the prestressed tensioning components located on the same side through two cables.

2. The prestressed concrete bearing plate with adjustable stiffness according to claim 1, characterized in that: Four protective shells are respectively arranged on the outer sides of the four side walls of the reinforced concrete bottom plate, and each of the protective shells is respectively installed on the outside of each of the prestressed tensioning components located on the same side.

3. The prestressed concrete bearing plate with adjustable stiffness according to claim 1, characterized in that: The prestressed tensioning assembly comprises a left force-bearing pad, a right force-bearing pad, two left supporting legs, two right supporting legs, an inner ring annular locking petal and an annular reaction ring, one end of each of the left supporting legs is respectively provided with a left arc end head, and the other end of each of the left supporting legs is respectively provided with a left assembly block; one end of each of the right supporting legs is respectively provided with a right arc end head, and the other end of each of the right supporting legs is respectively provided with a right assembly block; two left arc grooves matching with the left arc end heads are respectively provided on the left force-bearing pad, and two right arc grooves matching with the right arc end heads are respectively provided on the right force-bearing pad; arc assembly ends are respectively provided on each of the right assembly blocks, and arc assembly ends are respectively provided on each of the left assembly blocks. An arc assembly groove adapted to the arc assembly end; the two left arc ends are respectively assembled with the two left arc grooves, the two arc assembly ends are respectively assembled with the two arc assembly grooves, and the two right arc ends are respectively assembled with the two right arc grooves, so that a quadrilateral structure is formed between the two left supporting legs and the two right supporting legs; the annular reaction ring and the inner ring annular locking petal are respectively arranged in the quadrilateral structure, and through holes for the prestressed tendons to pass through are respectively provided on the left force pad and the right force pad, the annular reaction ring is sleeved on the outer side of the inner ring annular locking petal, and the inner ring annular locking petal is sleeved on the outer side of the prestressed tendons.

4. The prestressed concrete bearing plate with adjustable stiffness according to claim 3, characterized in that: The left force-bearing pad is composed of two symmetrical left half pads, each of which is provided with a corresponding first T-shaped slot, and the first I-shaped locking blocks are mounted in the corresponding two first T-shaped slots; the right force-bearing pad is composed of two symmetrical right half pads, each of which is provided with a corresponding second T-shaped slot, and the second I-shaped locking blocks are mounted in the corresponding two second T-shaped slots.

5. The prestressed concrete bearing plate with adjustable stiffness according to claim 3, characterized in that: The inner ring annular locking petal includes four arc-shaped locking petals, which can be enclosed to form a cylindrical shell structure, and a first circular barb is provided on the inner side wall of the inner ring annular locking petal; a second circular barb is provided at a position on the prestressed tendon corresponding to the inner ring annular locking petal, and the inner ring annular locking petal can be locked with the second circular barb on the prestressed tendon through the first circular barb; an elastic retaining spring is also provided on the inner side of the annular reaction ring.

6. The prestressed concrete bearing plate with adjustable stiffness according to claim 3, characterized in that: An upper left cable through hole and a lower left cable through hole are respectively provided on each of the left assembly blocks from top to bottom, and an upper right cable through hole and a lower right cable through hole are respectively provided on each of the right assembly blocks from top to bottom; the cables include an upper left cable, a lower left cable, an upper right cable and a lower right cable, the upper left cable passes through each of the upper left cable through holes respectively, and an upper left cable buckle is respectively provided on each of the upper left cables corresponding to the outer side of each of the left assembly blocks; the lower left cable passes through each of the lower left cable through holes respectively, and a lower left cable buckle is respectively provided on each of the lower left cables corresponding to the outer side of each of the left assembly blocks; the upper right cable is respectively provided with a right upper cable buckle on the outer side of each of the upper right cables corresponding to the outer side of each of the right assembly blocks; the lower right cable passes through each of the lower right cable through holes respectively, and a lower right cable buckle is respectively provided on each of the lower right cables corresponding to the outer side of each of the right assembly blocks.

7. The prestressed concrete bearing plate with adjustable stiffness according to claim 6, characterized in that: The power tensioning assembly includes a fixed shaft, a cable reel sleeve, a torque amplifier and a square head bolt. One end of the fixed shaft is fixedly connected to the side wall of the reinforced concrete base plate, the cable reel sleeve is rotatably installed on the fixed shaft, one end of the torque amplifier is fixedly connected to the cable reel sleeve, and the other end of the torque amplifier is fixedly connected to the square head bolt.

8. The prestressed concrete bearing plate with adjustable stiffness according to claim 7, characterized in that: The two power tensioning assemblies located on the same side of the reinforced concrete base plate are respectively designated as a first power tensioning assembly and a second power tensioning assembly; the free ends of the upper left cable and the upper right cable located on the same side are respectively wound and connected with the cable reel sleeve in the first power tensioning assembly; the free ends of the lower left cable and the lower right cable located on the same side are respectively wound and connected with the cable reel sleeve in the second power tensioning assembly.

9. The prestressed concrete bearing plate with adjustable stiffness according to claim 1, characterized in that: A low-friction prestressed channel for the prestressed tendons to pass through is provided on the reinforced concrete bottom plate, and the low-friction prestressed channel is composed of a hollow steel pipe pre-buried in the reinforced concrete bottom plate.

10. The prestressed concrete bearing plate with adjustable stiffness according to claim 1, characterized in that: The prestressed mesh is formed by staggered arrangement of a plurality of transverse prestressed tendons and longitudinal prestressed tendons, and both the transverse prestressed tendons and the longitudinal prestressed tendons are tensioned steel strands.

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