A prestressed support structure and construction method for protecting existing subway

Abstract

The present invention discloses a prestressed support structure and construction method for protecting an existing subway, and relates to the technical field of support structures. The present invention comprises a support pile, a support frame is arranged on the top of the support pile, a fixed frame is connected to the side of the support pile, a pressing plate is slidably connected to the top of the fixed frame, a U-shaped rod is slidably connected to the upper side of the fixed frame, the two ends of the U-shaped rod are connected to the same card plate, an elastic member is arranged between the card plate and the fixed frame, a card slot for connecting the card plate is provided on the side of the press plate, and a hinged rod is hinged at the bottom of the press plate. The present invention arranges the support pile, the pressing plate, the hinged rod, and the U-shaped block so that the U-shaped block is inserted into the soil, so that the support pile placed in the foundation pit can be strengthened and fixed, thereby avoiding the problem of the support pile moving or tilting during load or construction.

Description

Technical Field

[0001] The invention relates to the technical field of supporting structures, and in particular to a prestressed supporting structure for protecting an existing subway and a construction method. Background Art

[0002] The support structure is a structural system used to support and protect the soil around buildings, underground facilities or foundation pits. It includes support piles, prestressed structures, etc., which prevent soil settlement and deformation by bearing and dispersing loads, ensuring safety during construction and operation. The design and implementation of the support structure must take into account soil type, load conditions and construction environment to provide the necessary stability and support to protect the integrity of the surrounding environment and structures.

[0003] A Chinese patent with patent announcement number CN205822199U discloses a prestressed support system for protecting existing subways, including a base and a support frame, a middle-layer steel section is arranged on the upper part of the lower-layer steel section, an upper-layer steel section is arranged on the upper part of the middle-layer steel section, a steel cable limiting steel sheet is arranged on the upper part of the transverse connecting steel section, the steel cable passes through the steel cable limiting steel sheet, the steel cable limiting steel sheet is used to limit the forward and backward movement of the steel cable, and the two ends of the steel cable are respectively fixed to the crown beam by anchor heads. The utility model can make the device give full play to the material properties, can apply prestress, reuse the support frame, can be adjusted at any time according to different foundation pit conditions, and can greatly reduce construction and material costs.

[0004] However, the current support structure has the following problems: when the support piles in the support structure are placed inside the foundation pit, the support piles may be displaced or tilted due to the excavation of the foundation pit or uneven settlement of the soil, affecting their stability and supporting effect. Therefore, we propose a prestressed support structure and construction method for protecting existing subways. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a prestressed support structure and a construction method for protecting an existing subway, which solves the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a prestressed support structure for protecting an existing subway, comprising a support pile, a support frame is arranged on the top of the support pile, a fixed frame is connected to the side of the support pile, a pressing plate is slidably connected to the top of the fixed frame, a U-shaped rod is slidably connected to the upper side of the fixed frame, both ends of the U-shaped rod are connected to the same card plate, an elastic member is arranged between the card plate and the fixed frame, a card groove for clamping the card plate is opened on the side of the pressing plate, a hinged rod is hinged at the bottom of the pressing plate, a U-shaped block is hinged at one end of the hinged rod away from the pressing plate, the bottom of the U-shaped block is slidably connected to the bottom of the inner wall of the fixed frame, an anti-uplift component is arranged above the inner wall of the fixed frame, and a wetting component is arranged at the bottom of the pressing plate.

[0007] The beneficial effects of adopting the above technical solution are: placing the supporting piles inside the foundation pit, and then pressing the pressing plate downward. The downward movement of the pressing plate will push the U-shaped block into the soil on both sides of the foundation pit through the hinged rod, so that the U-shaped block is inserted into the soil. When the pressing plate moves downward to a certain distance, the card plate will be stuck to the inner wall of the card slot through the elastic force of the elastic part, thereby preventing the U-shaped block from being squeezed by the soil.

[0008] Further, the bottom of the pressing plate is connected to a connecting block, the bottom of the connecting block is connected to a push plate, the bottom of the push plate is connected to an elastic arc plate, the bottom of the elastic arc plate is connected to the side of the supporting pile, the bottom of the fixing frame is provided with a slot for the push plate to slide, and the arc surface of the elastic arc plate is provided with a plurality of slots;

[0009] The beneficial effect of adopting the above technical solution is that the downward movement of the pressing plate will drive the connecting block to move, the movement of the connecting block will drive the push plate to move, the movement of the push plate will squeeze the elastic arc plate, so that the arc surface of the elastic arc plate squeezes the soil.

[0010] Further, the anti-uplift assembly includes a track plate, both sides of which are connected to the upper inner wall of the fixed frame, the inner wall of the track plate is connected to a plurality of fixing rods, the outer walls of the plurality of fixing rods are slidably mounted with a same slider, the bottom of the slider is connected to an oblique plate, the bottom of the oblique plate is connected to the top of the U-shaped block, the side of the slider is connected to a fixing plate, the top of the slider is in contact with the inner wall of the track plate,

[0011] The beneficial effects of adopting the above technical solution are: the U-shaped block will drive the inclined plate to move, the movement of the inclined plate will drive the slider to move, the movement of the slider will drive the fixed plate to move, and the movement of the fixed plate will be inserted into the soil close to the ground.

[0012] Furthermore, the inner wall of the U-shaped block is slidably connected with a push block, and a side of the push block away from the inner wall of the U-shaped block is connected with multiple cutting knives, a side of the inner wall of the fixed frame is connected with a limiting plate, a side of the limiting plate away from the inner wall of the fixed frame is connected with multiple arc blocks, a side of the push block close to the limiting plate is connected with an L-shaped block, a side of the L-shaped block close to the limiting plate is connected with an arc block, a side of the push block away from the L-shaped block is connected with an elastic telescopic plate, a side of the elastic telescopic plate away from the push block is connected with a moving block, a side of the fixed frame close to the inner wall of the moving block is connected with a track block, the moving block is slidably connected to the inner wall of the track block, and a plurality of the arc blocks are located on the displacement track of the arc block.

[0013] The beneficial effects of adopting the above scheme are as follows: the movement of the U-shaped block will drive the push block to move, the movement of the push block will drive the cutting knife to move, and the movement of the push block will drive the L-shaped block to move. When the arc block on the L-shaped block moves to the arc block position that conflicts with the limit plate, the arc surface of the arc block of the limit plate pushes the arc surface of the arc block on the L-shaped block to drive the L-shaped block to move away from the limit plate. The movement of the L-shaped block will drive the entire push block to move, and the movement of the push block will squeeze the elastic telescopic plate. When the arc surface of the arc block on the L-shaped block no longer conflicts with the arc block of the limit plate, the elastic telescopic plate will drive the push block to reset under the action of its own elastic force, and so on, so that the push block can realize reciprocating motion, and the reciprocating motion of the push block will drive the cutting knife to reciprocate.

[0014] Furthermore, the wetting component includes a T-shaped rod, the top of the T-shaped rod is connected to the bottom of the pressing plate, the bottom of the inner wall of the fixed frame is connected to a U-shaped soft shell, the inner wall of the U-shaped soft shell is connected to water storage cotton, the bottom of the fixed frame is in contact with the bottom of the inner wall of the fixed frame, the bottom of the fixed frame is provided with a diversion groove for diverting water in the water storage cotton, the bottom of the push plate is provided with a plurality of diversion holes, the plurality of diversion holes are located above the elastic arc plate, the U-shaped soft shell is located on the displacement track of the T-shaped rod, and the side of the water storage cotton is connected with a one-way liquid inlet pipe.

[0015] The beneficial effect of adopting the above technical solution is: when the pressing plate moves downward, the movement of the pressing plate will drive the T-shaped rod to move, and the movement of the T-shaped rod will squeeze the U-shaped soft shell. The squeezing of the U-shaped soft shell will also squeeze the water storage cotton, so that the water inside the water storage cotton flows from the guide hole through the guide groove to the surface of the elastic arc plate.

[0016] A prestressed construction method for protecting an existing subway prestressed support structure, comprising the following steps:

[0017] S1. First, place the support piles inside the foundation pit, and then press the pressing plate downwards;

[0018] The downward movement of the pressing plates in S2 and S1 will push the U-shaped blocks into the soil on both sides of the foundation pit through the hinged rods, and insert the U-shaped blocks into the soil;

[0019] S3. When the pressing plate moves downward to a certain distance, the card plate is clamped to the inner wall of the card slot by the elastic force of the elastic member;

[0020] S4. The downward movement of the pressing plate will drive the connecting block to move, the movement of the connecting block will drive the push plate to move, and the movement of the push plate will squeeze the elastic arc plate.

[0021] The present invention provides a prestressed support structure and construction method for protecting an existing subway, which has the following beneficial effects:

[0022] (1) The present invention arranges support piles, a pressing plate, a hinged rod, and a U-shaped block so that the U-shaped block is inserted into the soil, thereby strengthening and fixing the support piles placed in the foundation pit, thereby avoiding the problem of the support piles moving or tilting during load or construction; at the same time, through the cooperation of the pressing plate and the U-shaped block, when the pressing plate moves downward to a certain distance, the clamping plate will be clamped to the inner wall of the clamping groove through the elastic force of the elastic member, thereby avoiding the problem of the U-shaped block being squeezed by the soil and the U-shaped block is no longer fixed to the soil; at the same time, through the cooperation of the pressing plate, the connecting block, the push plate, and the elastic arc plate, the movement of the connecting block will drive the push plate to move, and the movement of the push plate will squeeze the elastic arc plate, so that the arc surface of the elastic arc plate squeezes the soil, thereby reducing the risk of soil collapse or sliding, and at the same time, a number of notches on the surface of the elastic arc plate can increase the contact area with the soil.

[0023] (2) The present invention sets an anti-uplift component so that the slider, the inclined plate and the U-shaped block cooperate with each other, so that the movement of the slider will drive the fixed plate to move, and the movement of the fixed plate will be inserted into the soil close to the ground, thereby avoiding the problem that the soil is squeezed and then uplifted, so that the uplifted soil exerts additional lateral pressure on the support pile, causing the pile body to bend or tilt, and affecting the support effect; at the same time, through the cooperation of the fixed plate, the push block, the cutting knife, the limit plate, the L-shaped block, the track block, the moving block and the elastic telescopic plate, the elastic telescopic plate will drive the push block to reset under the action of its own elastic force, and so on, so that the push block can achieve reciprocating motion, and the reciprocating motion of the push block will drive the cutting knife to reciprocate, so that the cutting knife cuts the hard soil, so that the U-shaped block can be smoothly inserted into the soil.

[0024] (3) The present invention arranges the wetting components so that the T-shaped rod, U-shaped soft shell, water storage cotton, diversion groove, diversion hole, and elastic arc plate cooperate with each other, so that the movement of the T-shaped rod will squeeze the U-shaped soft shell, and the squeezing of the U-shaped soft shell will also squeeze the water storage cotton, so that the water inside the water storage cotton flows from the diversion hole to the surface of the elastic arc plate through the diversion groove, which can shape the loose soil, thereby further reducing the risk of soil collapse or sliding. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the present invention as a whole;

[0026] Figure 2 This is a schematic diagram of the structure of the elastic arc plate of the present invention;

[0027] Figure 3 This is a structural schematic diagram of the card board of the present invention;

[0028] Figure 4 This is a structural schematic diagram of the connection block of the present invention;

[0029] Figure 5 This is a structural schematic diagram of the wet component of the present invention;

[0030] Figure 6 It is a structural schematic diagram of the anti-uplift component of the present invention;

[0031] Figure 7 It is a structural schematic diagram of the limiting plate of the present invention;

[0032] Figure 8 It is a schematic diagram of the structure of the track block of the present invention.

[0033] In the figure: 1. Support pile; 2. Support frame; 3. Fixed frame; 4. Pressing plate; 5. U-shaped rod; 6. Card plate; 7. Articulated rod; 8. Anti-uplift component; 81. Track plate; 82. Fixed rod; 83. Sliding block; 84. Oblique plate; 85. Fixed plate; 86. Push block; 87. Cutting knife; 88. Limiting plate; 89. L-shaped block; 810. Track block; 811. Moving block; 812. Elastic telescopic plate; 9. Wetting component; 91. T-shaped rod; 92. U-shaped soft shell; 93. Water storage cotton; 94. Diversion groove; 95. Diversion hole; 10. U-shaped block; 11. Connecting block; 12. Push plate; 13. Elastic arc plate. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0035] See also Figure 1-Figure 8An embodiment of the present invention is: a prestressed support structure and construction method for protecting an existing subway, comprising a support pile 1, a support frame 2 is arranged on the top of the support pile 1, a fixed frame 3 is connected to the side of the support pile 1, a pressing plate 4 is slidably connected to the top of the fixed frame 3, a U-shaped rod 5 is slidably connected to the upper side of the fixed frame 3, both ends of the U-shaped rod 5 are connected to the same clamping plate 6, an elastic member is arranged between the clamping plate 6 and the fixed frame 3, and the elastic member is a spring. The side of the pressing plate 4 is provided with a slot for clamping the clamping plate 6, and the bottom of the pressing plate 4 is hinged with a hinged rod 7, and the end of the hinged rod 7 away from the pressing plate 4 is hinged with a U-shaped block 10, and the bottom of the U-shaped block 10 is slidably connected to the bottom of the inner wall of the fixed frame 3, and an anti-uplift component 8 is arranged above the inner wall of the fixed frame 3, and a wetting component 9 is arranged at the bottom of the pressing plate 4. Through the arrangement of the above structure, the U-shaped block 10 is inserted into the soil, so that the supporting pile 1 placed in the foundation pit can be strengthened and fixed, thereby avoiding the problem of the supporting pile 1 moving or tilting during load or construction. The clamping plate 6 will be clamped to the inner wall of the slot through the elastic force of the elastic member, thereby avoiding the U-shaped block 10 from being squeezed by the soil, so that the U-shaped block 10 is no longer fixed to the soil.

[0036] The bottom of the pressing plate 4 is connected to a connecting block 11, the bottom of the connecting block 11 is connected to a push plate 12, the bottom of the push plate 12 is connected to an elastic arc plate 13, the bottom of the elastic arc plate 13 is connected to the side of the supporting pile 1, the bottom of the fixed frame 3 is provided with a slot for the push plate 12 to slide, and the arc surface of the elastic arc plate 13 is provided with a plurality of slots. Through the arrangement of the above structure, the movement of the push plate 12 will squeeze the elastic arc plate 13, so that the arc surface of the elastic arc plate 13 squeezes the soil, thereby reducing the risk of soil collapse or sliding. At the same time, the plurality of slots on the surface of the elastic arc plate 13 can increase the contact area with the soil.

[0037] The anti-uplift component 8 includes a track plate 81, both sides of which are connected to the upper inner wall of the fixed frame 3, the inner wall of the track plate 81 is connected to a plurality of fixing rods 82, the outer walls of the plurality of fixing rods 82 are slidably mounted with the same slider 83, the bottom of the slider 83 is connected to an inclined plate 84, the bottom of the inclined plate 84 is connected to the top of the U-shaped block 10, the side of the slider 83 is connected to a fixing plate 85, the top of the slider 83 is in contact with the inner wall of the track plate 81, through the arrangement of the above structure, the movement of the fixing plate 85 will be inserted into the soil close to the ground, thereby avoiding the soil from being squeezed and then uplifted, so that the uplifted soil exerts additional lateral pressure on the support pile 1, causing the pile body to bend or tilt, affecting the support effect.

[0038] The inner wall of the U-shaped block 10 is slidably connected with a push block 86, and a side of the push block 86 away from the inner wall of the U-shaped block 10 is connected with multiple cutting knives 87, a side of the inner wall of the fixed frame 3 is connected with a limiting plate 88, and a side of the limiting plate 88 away from the inner wall of the fixed frame 3 is connected with multiple arc blocks, a side of the push block 86 close to the limiting plate 88 is connected with an L-shaped block 89, and a side of the L-shaped block 89 close to the limiting plate 88 is connected with an arc block, a side of the push block 86 away from the L-shaped block 89 is connected with an elastic telescopic plate 812, and a side of the elastic telescopic plate 812 away from the push block 86 is connected with a moving block 811, and a side of the inner wall of the fixed frame 3 close to the moving block 811 is connected with a track block 810, and the moving block 811 is slidably connected to the inner wall of the track block 810, and multiple arc blocks are located on the displacement track of the arc block. Through the setting of the above structure, the elastic retractable plate 812 will drive the push block 86 to reset under the action of its own elastic force, and so on, so that the push block 86 can realize reciprocating motion. The reciprocating motion of the push block 86 will drive the cutting knife 87 to reciprocate, so that the cutting knife 87 can cut the hard soil into pieces, so that the U-shaped block 10 can be smoothly inserted into the soil.

[0039] When in use, the support pile 1 is placed inside the foundation pit, and then the pressing plate 4 is pressed downward. The downward movement of the pressing plate 4 will push the U-shaped block 10 to move into the soil on both sides of the foundation pit through the hinge rod 7, so that the U-shaped block 10 is inserted into the soil, so that the support pile 1 placed inside the foundation pit can be strengthened and fixed, thereby avoiding the problem of the support pile 1 moving or tilting during load or construction; when the pressing plate 4 moves downward to a certain distance, the clamping plate 6 will be clamped to the inner wall of the clamping groove through the elastic force of the elastic member, thereby avoiding the U-shaped block 10 from being squeezed by the soil, so that the U-shaped block 10 is no longer fixed to the soil; the downward movement of the pressing plate 4 will drive the connecting block 11 to move, and the movement of the connecting block 11 will drive the push plate 12 to move, and the movement of the push plate 12 will squeeze the elastic arc plate 13, so that the arc surface of the elastic arc plate 13 squeezes the soil, thereby reducing the risk of soil collapse or sliding, and at the same time, the several notches on the surface of the elastic arc plate 13 can increase the contact area with the soil.

[0040] The U-shaped block 10 will drive the inclined plate 84 to move, the movement of the inclined plate 84 will drive the slider 83 to move, the movement of the slider 83 will drive the fixed plate 85 to move, the movement of the fixed plate 85 will be inserted into the soil close to the ground, thereby avoiding the soil from bulging after being squeezed, so that the bulging soil exerts additional lateral pressure on the support pile 1, causing the pile body to bend or tilt, affecting the support effect; the movement of the U-shaped block 10 will drive the push block 86 to move, the movement of the push block 86 will drive the cutting knife 87 to move, and the movement of the push block 86 will drive the L-shaped block 89 to move. When the arc block on the L-shaped block 89 moves to the arc block that abuts the limit plate 88 When the U-shaped block 10 is in the same position as the pushing block 86, the arc surface of the limiting plate 88 pushes the arc surface of the L-shaped block 89 to drive the L-shaped block 89 to move away from the limiting plate 88. The movement of the L-shaped block 89 will drive the entire pushing block 86 to move. The movement of the pushing block 86 will squeeze the elastic telescopic plate 812. When the arc surface of the arc block on the L-shaped block 89 no longer conflicts with the arc block of the limiting plate 88, the elastic telescopic plate 812 will drive the pushing block 86 to reset under the action of its own elastic force, and so on, so that the pushing block 86 can realize reciprocating motion. The reciprocating motion of the pushing block 86 will drive the cutting knife 87 to reciprocate, so that the cutting knife 87 can cut the hard soil into pieces, so that the U-shaped block 10 can be smoothly inserted into the soil.

[0041] See also Figure 1-Figure 8 On the basis of the above embodiment, in another embodiment of the present invention, the wetting component 9 includes a T-shaped rod 91, the top of the T-shaped rod 91 is connected to the bottom of the pressing plate 4, the bottom of the inner wall of the fixed frame 3 is connected to a U-shaped soft shell 92, the inner wall of the U-shaped soft shell 92 is connected to a water storage cotton 93, the bottom of the fixed frame 3 is in contact with the bottom of the inner wall of the fixed frame 3, the bottom of the fixed frame 3 is provided with a diversion groove 94 for diverting water in the water storage cotton 93, the bottom of the push plate 12 is provided with a plurality of diversion holes 95, and the plurality of diversion holes 95 are located above the elastic arc plate 13, the U-shaped soft shell 92 is located on the displacement track of the T-shaped rod 91, and the side of the water storage cotton 93 is connected to a one-way liquid inlet pipe, through the above-mentioned structure, the U-shaped soft shell 92 is squeezed and the water storage cotton 93 is squeezed at the same time, so that the water inside the water storage cotton 93 flows from the diversion hole 95 to the surface of the elastic arc plate 13 through the diversion groove 94, and the loose soil can be shaped, thereby further reducing the risk of soil collapse or sliding.

[0042] When in use, when the pressing plate 4 moves downward, the movement of the pressing plate 4 will drive the T-shaped rod 91 to move, and the movement of the T-shaped rod 91 will squeeze the U-shaped soft shell 92. The squeezing of the U-shaped soft shell 92 will also squeeze the water storage cotton 93, so that the water inside the water storage cotton 93 flows from the guide hole 95 through the guide groove 94 to the surface of the elastic arc plate 13, which can shape the loose soil, thereby further reducing the risk of soil collapse or sliding.

[0043] In addition, the present invention also provides a construction method for protecting a prestressed support structure of an existing subway, comprising the following steps:

[0044] S1. First, place the support pile 1 inside the foundation pit, and then press the pressing plate 4 downward;

[0045] The downward movement of the pressing plates 4 in S2 and S1 will push the U-shaped blocks 10 to move into the soil on both sides of the foundation pit through the hinged rods 7, and insert the U-shaped blocks 10 into the soil;

[0046] S3, when the pressing plate 4 moves downward to a certain distance, the card plate 6 is clamped to the inner wall of the card slot by the elastic force of the elastic member;

[0047] S4, the downward movement of the pressing plate 4 will drive the connecting block 11 to move, the movement of the connecting block 11 will drive the push plate 12 to move, and the movement of the push plate 12 will squeeze the elastic arc plate 13.

[0048] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A prestressed support structure for protecting an existing subway, comprising a support pile (1), a support frame (2) being arranged on the top of the support pile (1), characterized in that: The side of the support pile (1) is connected to a fixing frame (3), the top of the fixing frame (3) is slidably connected to a pressing plate (4), the upper side of the fixing frame (3) is slidably connected to a U-shaped rod (5), both ends of the U-shaped rod (5) are connected to the same clamping plate (6), and an elastic member is provided between the clamping plate (6) and the fixing frame (3); A slot for clamping the clamping plate (6) is provided on the side of the pressing plate (4); a hinged rod (7) is hingedly connected to the bottom of the pressing plate (4); a U-shaped block (10) is hingedly connected to one end of the hinged rod (7) away from the pressing plate (4); the bottom of the U-shaped block (10) is slidably connected to the bottom of the inner wall of the fixed frame (3); an anti-bulge component (8) is provided above the inner wall of the fixed frame (3); and a wetting component (9) is provided at the bottom of the pressing plate (4); The bottom of the pressing plate (4) is connected to a connecting block (11), the bottom of the connecting block (11) is connected to a pushing plate (12), the bottom of the pushing plate (12) is connected to an elastic arc plate (13), and the bottom of the elastic arc plate (13) is connected to the side of the supporting pile (1); The anti-bulge assembly (8) comprises a track plate (81), both sides of the track plate (81) are connected to the upper part of the inner wall of the fixed frame (3), the inner wall of the track plate (81) is connected to a plurality of fixed rods (82), the outer walls of the plurality of fixed rods (82) are slidably mounted with a same slider (83), the bottom of the slider (83) is connected to an oblique plate (84), the bottom of the oblique plate (84) is connected to the top of the U-shaped block (10), and the side of the slider (83) is connected to a fixed plate (85); The inner wall of the U-shaped block (10) is slidably connected to a push block (86), and a side of the push block (86) away from the inner wall of the U-shaped block (10) is connected to a plurality of cutting knives (87); A limiting plate (88) is connected to one side of the inner wall of the fixed frame (3); a side of the limiting plate (88) away from the inner wall of the fixed frame (3) is connected to a plurality of arc blocks; a side of the push block (86) close to the limiting plate (88) is connected to an L-shaped block (89); a side of the L-shaped block (89) close to the limiting plate (88) is connected to an arc block; and a side of the push block (86) away from the L-shaped block (89) is connected to an elastic telescopic plate (812); The side of the elastic retractable plate (812) away from the push block (86) is connected to a moving block (811), and the side of the inner wall of the fixed frame (3) close to the moving block (811) is connected to a track block (810), and the moving block (811) is slidably connected to the inner wall of the track block (810); The wetting assembly (9) comprises a T-shaped rod (91), the top of the T-shaped rod (91) is connected to the bottom of the pressing plate (4), the bottom of the inner wall of the fixed frame (3) is connected to a U-shaped soft shell (92), the inner wall of the U-shaped soft shell (92) is connected to a water storage cotton (93), the bottom of the fixed frame (3) is in contact with the bottom of the inner wall of the fixed frame (3), the bottom of the fixed frame (3) is provided with a diversion groove (94) for diverting water in the water storage cotton (93), and the bottom of the push plate (12) is provided with a plurality of diversion holes (95).

2. The prestressed support structure for protecting an existing subway according to claim 1 is characterized in that: The bottom of the fixed frame (3) is provided with a slot for the push plate (12) to slide, and the arc surface of the elastic arc plate (13) is provided with a plurality of slots.

3. The prestressed support structure for protecting an existing subway according to claim 1 is characterized in that: The plurality of arc blocks are located on a displacement track of the arc block, and the top of the sliding block (83) is in contact with the inner wall of the track plate (81).

4. The prestressed support structure for protecting an existing subway according to claim 1, characterized in that: The plurality of guide holes (95) are located above the elastic arc plate (13), the U-shaped soft shell (92) is located on the displacement track of the T-shaped rod (91), and the side of the water storage cotton (93) is connected to a one-way liquid inlet pipe.

5. A construction method for protecting a prestressed support structure for an existing subway according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. First, place the support pile (1) inside the foundation pit, and then press the pressing plate (4) downward; The downward movement of the pressing plates (4) in S2 and S1 will push the U-shaped blocks (10) toward the soil on both sides of the foundation pit through the hinged rods (7), and insert the U-shaped blocks (10) into the soil; S3, when the pressing plate (4) moves downward to a certain distance, the clamping plate (6) is clamped to the inner wall of the clamping slot by the elastic force of the elastic member; S4. The downward movement of the pressing plate (4) drives the connecting block (11) to move, and the movement of the connecting block (11) drives the push plate (12) to move, and the movement of the push plate (12) squeezes the elastic arc plate (13).

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