Prestress anti-floating anchor pile slow-bonding anchoring device and construction method thereof

Abstract

The invention relates to the technical field of constructional engineering, and discloses a prestressed anti-floating anchor rod pile slow-bonding anchoring device and a construction method thereof, and the prestressed anti-floating anchor rod pile slow-bonding anchoring device comprises a foundation soil body, a waterproof plate, an anchoring assembly, a concrete bottom plate and a steel rod. A concrete cushion layer is poured on the foundation soil body, and anchor rod piles are poured in the foundation soil body and the concrete cushion layer. The waterproof plate is arranged on the concrete cushion layer, the concrete bottom plate is connected with the waterproof plate, and the concrete bottom plate is poured on the outer side of the anchoring assembly; the steel rod penetrates through the anchoring assembly, the waterproof plate and the anchor rod pile, a fastening nut is arranged on the steel rod in a screwed mode and attached to the upper steel sleeve, and a cavity formed between the steel rod and the sliding sleeve is filled with a slow binding agent. The anchoring assembly and the concrete bottom plate are jointly poured, the anchoring assembly is filled with the slow-binding agent, after stress is applied through the fastening nuts, the slow-binding agent is solidified, the water seepage channel is closed, the construction efficiency is improved, and the cracking and leakage risks of the bottom plate structure are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of construction engineering, and in particular relates to a prestressed anti-floating anchor pile slow-bonding anchoring device and a construction method thereof. Background Art

[0002] During urban construction, underground space is being comprehensively developed and utilized. Groundwater levels exert buoyancy on underground structures, significantly impacting cracking and leakage in the floor slab. To address this buoyancy-induced damage, currently, the main technologies employed are increasing floor slab thickness and adding pull-out piles, which are relatively costly. While non-prestressed anchor piles are less expensive, they are prone to loosening. Once the floor is sealed and the water level rises, cracks and leakage may develop in the floor slab. However, the prestressed anchor piles employed in recent years require post-tensioning, requiring holes to be reserved in the floor slab structure, creating seepage channels that can potentially cause floor slab cracking. Furthermore, the existing prestress is concentrated at a single point in the floor slab, making excessive prestressing more susceptible to damage.

[0003] To address these issues, a prestressed anti-floating anchor with a retarded bonding anchoring device and its construction method were developed. The anchor assembly is cast together with the concrete baseplate, and a retarded bonding agent is filled within the anchor assembly. When stress is applied, the retarded bonding agent solidifies, sealing the seepage channel. This improves construction efficiency and reduces the risk of cracking and leakage in the baseplate structure.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: A prestressed anti-floating anchor pile slow-bonding anchoring device comprises foundation soil, a waterproof plate, an anchoring assembly, a concrete bottom plate and a steel rod.

[0006] A concrete cushion is poured on the foundation soil, and anchor piles are poured inside the foundation soil and the concrete cushion; The waterproof board is arranged on the concrete cushion; The anchor assembly includes a lower supporting steel plate, a lower steel casing, an upper supporting steel plate and an upper steel casing, the lower supporting steel plate is overlapped on the waterproof plate, the lower steel casing is welded to the lower supporting steel plate, the upper supporting steel plate is welded on the top of the lower steel casing, and the upper steel casing is welded to the upper supporting steel plate, three elastic steel plates are arranged around the upper supporting steel plate and the lower supporting steel plate, a sliding sleeve is rotatably installed on the outer wall of the lower steel casing, an injection hole is provided on the sliding sleeve, and the injection hole corresponds to the through hole provided on the side wall of the lower steel casing, a sliding seat is installed on the side wall of the sliding sleeve, and a first curved surface, a switching surface and a second curved surface are provided on the surface of the sliding seat, the switching surface is used to connect the first curved surface and the second curved surface, an extrusion plate is slidably provided on the surface of the sliding seat, and the end of the extrusion plate is in contact with the corresponding elastic steel plate surface; The bottom of the concrete base plate is connected to the waterproof plate, and the concrete base plate is cast outside the anchor assembly; The steel rod passes through the anchor assembly, waterproof board and anchor pile, the steel rod is provided with a thread, and a fastening nut is screwed on the thread, and the fastening nut is attached to the upper steel casing, and the cavity formed between the steel rod and the sliding sleeve is filled with a slow-adhesion agent.

[0007] As a preferred embodiment of the present invention, pile holes are drilled on the surface of the foundation soil and the concrete cushion layer, and the two pile holes have the same diameter and correspond vertically, and the anchor piles are installed on the pile holes.

[0008] As a preferred embodiment of the present invention, the connection between the waterproof board and the steel rod is filled with sealant, a plurality of pairs of tension bars are integrally cast inside the concrete base plate, and the upper steel casing is filled with sealing anchor mortar, which covers the outside of the fastening nut.

[0009] As a preferred embodiment of the present invention, the centers of the lower supporting steel plate, the lower steel casing, the upper supporting steel plate and the upper steel casing are all on the same vertical straight line, the lower supporting steel plate and the upper supporting steel plate are circular plates, and threaded groove through holes are opened at the center positions of the lower supporting steel plate and the upper supporting steel plate, and the size of the threaded groove through holes is adapted to the thread size of the steel rod surface.

[0010] As a preferred embodiment of the present invention, the specifications and sizes of the lower steel casing and the upper steel casing are different. The diameter of the lower steel casing is more than 50 mm larger than the diameter of the steel rod, the diameter of the upper steel casing is more than 50 mm larger than the diameter of the fastening nut, the diameter of the lower steel casing is smaller than the diameter of the upper steel casing, and the upper surface of the upper steel casing is flush with the top of the concrete base plate.

[0011] As a preferred embodiment of the present invention, an installation groove is provided on the outer wall of the lower steel casing, the through hole is provided inside the installation groove, the sliding sleeve is rotatably installed on the outside of the installation groove, the size of the through hole and the size of the injection hole are adapted to each other, the through hole and the filling cavity provided inside the sliding sleeve are connected to each other, and the retarding agent is injected into the filling cavity.

[0012] As a preferred embodiment of the present invention, the elastic steel plate is arc-shaped, and the protrusion on the surface of the elastic steel plate is aligned with the center position of the sliding sleeve, and the protrusion is in contact with the surface of the extrusion plate. L-shaped connecting seats are installed at both ends of the elastic steel plate, and the two L-shaped connecting seats are respectively in contact with the lower supporting steel plate and the upper supporting steel plate, and a locking bolt is installed between the two.

[0013] As a preferred embodiment of the present invention, a synchronization rod is installed through the inside of the extrusion plate, and limit sliders are installed at both ends of the synchronization rod. Limit slots are provided on the relative surfaces of the lower supporting steel plate and the upper supporting steel plate. The limit sliders are slidably arranged in the corresponding limit slots. A limit rod is installed through the side wall of the limit slot, and the limit rod and the limit slider are movably inserted. A limit spring is sleeved on the side wall of the limit rod, and one end of the limit spring is clamped to the side wall of the limit slot, and the other end is clamped to the side wall of the limit slider.

[0014] As a preferred embodiment of the present invention, the curvature diameter corresponding to the first curved surface is smaller than the curvature diameter corresponding to the second curved surface, a blocking guardrail is installed between the lower supporting steel plate and the upper supporting steel plate, the blocking guardrail corresponds to the side wall of the slide, and the surface where the extrusion plate is connected to the slide is chamfered.

[0015] As a preferred embodiment of the present invention, the construction method of the prestressed anti-floating anchor pile slow-bonding anchoring device comprises the following steps: Step 1: Excavate the foundation soil to the designed elevation, construct a concrete cushion, use a drilling rig to drill holes and inject grout to form anchor piles, and insert steel rods into the anchor piles; Step 2: Install waterproof board; Step 3: Install the anchor assembly, insert the lower bearing steel plate, lower steel casing, upper bearing steel plate and upper steel casing on the steel rod, then fill the lower steel casing with slow-adhesive through the through hole on the lower steel casing. When the filling is completed, the operator rotates the sliding sleeve so that the injection holes on the sliding sleeve are staggered with the through holes, thereby sealing the lower steel casing as a whole; Step 4: During the rotation of the sleeve, the slide seat on the side wall of the sleeve slides synchronously, and the extrusion plate is guided to slide from the first curved surface to the second curved surface through the switching surface on the slide seat. The extrusion plate is pushed to slide outward by the second curved surface, and then the extrusion plate squeezes the elastic steel plate. At this time, the elastic steel plate under the squeezing force squeezes the lower steel plate and the upper steel plate, thereby applying prestress; Step 5: Install the concrete base plate by pouring the concrete base plate so that the concrete base plate wraps the entire anchor assembly; Step 6: After the concrete of the concrete base plate reaches the design strength, use hydraulic torque equipment to rotate the tightening nut to drive the steel rod to rise and apply prestress to the concrete base plate and anchor piles.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The anchor assembly of the present invention is cast together with the concrete base plate, and a retarder is filled in the anchor assembly. After stress is applied by tightening the nut, the retarder solidifies and closes the water seepage channel, thereby improving construction efficiency and reducing the risk of cracking and leakage of the base plate structure.

[0017] According to the present invention, after the retarding agent is filled, the operator rotates the sleeve so that the injection hole and the through hole on the sleeve are staggered, and then the lower steel casing is sealed as a whole, so that the retarding agent does not flow out. In the process of the rotation of the sleeve, the slide seat of the side wall of the sleeve slides synchronously, and the switching surface on the slide seat guides the extrusion plate to slide from the first curved surface to the second curved surface, and the extrusion plate is pushed to slide outward by the second curved surface, and then the extrusion plate squeezes the elastic steel plate. At this time, the elastic steel plate subjected to the extrusion force squeezes the lower supporting steel plate and the upper supporting steel plate, thereby applying prestress and increasing the prestressing position. At this time, the stress state of the anchor pile is more reasonable, and the internal stress distribution is more uniform, which can reduce the local high stress area caused by frequent buoyancy loading and unloading, and can effectively delay the fatigue damage and corrosion of the anchor pile material, thereby extending the service life of the anti-floating anchor pile and reducing the later maintenance cost.

[0018] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In the attached figure: Figure 1 This is a schematic diagram of the three-dimensional structure of a prestressed anti-floating anchor pile slow-bonding anchoring device; Figure 2 A side cross-sectional view of a prestressed anti-floating anchor pile slow-bonding anchoring device; Figure 3 A three-dimensional diagram of the anchoring assembly of a prestressed anti-floating anchor pile slow-bonding anchoring device; Figure 4 A schematic diagram of the partial structure of a prestressed anti-floating anchor pile slow-bonding anchoring device Figure 1 ; Figure 5 A prestressed anti-floating anchor pile slow-bonding anchoring device Figure 4 Enlarged view of point A in the middle; Figure 6 A cross-sectional view of an anchor assembly of a prestressed anti-floating anchor pile slow-bonding anchoring device; Figure 7 A schematic diagram of the partial structure of a prestressed anti-floating anchor pile slow-bonding anchoring device Figure 2 .

[0020] In the picture: 1. Foundation soil; 11. Pile hole; 111. Anchor pile; 12. Concrete cushion; 2. Waterproof board; 21. Sealant; 3. Concrete base plate; 31. Tie bars; 4. Steel rod; 41. Thread; 411. Fastening nut; 5. Anchor assembly; 51. Lower supporting steel plate; 52. Lower steel casing; 521. Mounting groove; 522. Through hole; 523. Sliding sleeve; 524. Injection hole; 525. Filling inner cavity; 526. Retarding agent; 53. Upper supporting steel plate; 54. Upper steel casing; 541. Anchor mortar; 55. Elastic steel plate; 551. L-shaped connecting seat; 552. Locking bolt; 56. Extrusion plate; 561. Synchronizing rod; 562. Limiting slider; 563. Limiting slide groove; 564. Limiting rod; 565. Limiting spring; 57. Sliding seat; 571. First curved surface; 572. Switching surface; 573. Second curved surface; 574. Barrier board. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention.

[0022] Example 1, as Figures 1 to 7 As shown, a prestressed anti-floating anchor pile slow-bonding anchoring device includes foundation soil 1, a waterproof board 2, an anchoring assembly 5, a concrete base plate 3 and a steel rod 4.

[0023] A concrete cushion layer 12 is poured on the foundation soil 1, and anchor piles 111 are poured inside the foundation soil 1 and the concrete cushion layer 12; the waterproof board 2 is set on the concrete cushion layer 12; The anchor assembly 5 includes a lower bearing steel plate 51, a lower steel casing 52, an upper bearing steel plate 53 and an upper steel casing 54. The lower bearing steel plate 51 is overlapped on the waterproof plate 2, the lower steel casing 52 is welded to the lower bearing steel plate 51, the upper bearing steel plate 53 is welded to the top of the lower steel casing 52, and the upper steel casing 54 is welded to the upper bearing steel plate 53. Three elastic steel plates 55 are arranged around the upper bearing steel plate 53 and the lower bearing steel plate 51. A sliding sleeve 523 is rotatably installed on the outer wall of the lower steel casing 52. An injection hole 524 is formed on the sleeve 523, and the injection hole 524 corresponds to the through hole 522 formed on the side wall of the lower steel casing 52. A sliding seat 57 is mounted on the side wall of the sliding sleeve 523. The surface of the sliding seat 57 has a first curved surface 571, a switching surface 572, and a second curved surface 573. The switching surface 572 is used to connect the first curved surface 571 and the second curved surface 573. An extrusion plate 56 is slidably provided on the surface of the sliding seat 57, and the end of the extrusion plate 56 is in contact with the surface of the corresponding elastic steel plate 55. The bottom of the concrete base plate 3 is connected to the waterproof board 2, and the concrete base plate 3 is cast on the outside of the anchor assembly 5; the steel rod 4 passes through the anchor assembly 5, the waterproof board 2 and the anchor pile 111, and a thread 41 is provided on the steel rod 4, and a fastening nut 411 is screwed on the thread, and the fastening nut 411 is attached to the upper steel casing 54, and the cavity formed between the steel rod 4 and the sliding sleeve 523 is filled with a slow-adhesive agent 526.

[0024] After the slow-binder 526 is filled, the operator rotates the sleeve 523 so that the injection hole 524 on the sleeve 523 is staggered with the through hole 522, thereby sealing the lower steel casing 52 as a whole, so that the slow-binder 526 will not flow out. During the rotation of the sleeve 523, the slide seat 57 on the side wall of the sleeve 523 slides synchronously, and the switching surface 572 on the slide seat 57 guides the extrusion plate 56 to slide from the first curved surface 571 to the second curved surface 573, and the extrusion plate 56 is pushed to slide outward through the second curved surface 573. The elastic steel plate 55 is squeezed by the extrusion plate 56. At this time, the elastic steel plate 55 subjected to the extrusion force squeezes the lower supporting steel plate 51 and the upper supporting steel plate 53, thereby applying prestress and increasing the prestressing position. At this time, the stress state of the anchor pile 111 is more reasonable, and the internal stress distribution is more uniform. It can reduce the local high stress area caused by frequent buoyancy loading and unloading, and can effectively delay the fatigue damage and corrosion of the anchor pile material, thereby extending the service life of the anti-floating anchor pile and reducing the later maintenance cost.

[0025] like Figures 1 to 7 As shown, in a specific embodiment, pile holes 11 are opened on the surface of the foundation soil 1 and the concrete cushion layer 12 by a drilling rig, and the two pile holes 11 have the same diameter and are vertically corresponding in position. Anchor piles 111 are installed on the pile holes 11, and the pile holes 11 ensure that the anchor piles 111 can be stably connected to the foundation soil 1 and the concrete cushion layer 12.

[0026] like Figures 1 to 7 As shown, further, the connection between the waterproof board 2 and the steel rod 4 is filled with sealant 21, and the sealant 21 can improve the sealing performance. A plurality of pairs of tie bars 31 are integrally cast inside the concrete base plate 3, and the tie bars 31 can improve the overall structural strength of the concrete base plate 3. The upper steel casing 54 is filled with sealing anchor mortar 541, and the sealing anchor mortar 541 covers the outside of the fastening nut 411, wherein the sealing anchor mortar 541 can seal the fastening nut 411 after rotation, thereby achieving the purpose of positioning.

[0027] Example 2, based on Example 1 and different from this example: Figures 1 to 7 As shown, the centers of the lower supporting steel plate 51, the lower steel casing 52, the upper supporting steel plate 53 and the upper steel casing 54 are all on the same vertical straight line, the lower supporting steel plate 51 and the upper supporting steel plate 53 are circular plates, and threaded groove through holes are opened at the center positions of the lower supporting steel plate 51 and the upper supporting steel plate 53, and the size of the threaded groove through holes is adapted to the size of the thread 41 on the surface of the steel rod 4. Through the above structure, it can be ensured that the anchor assembly 5 can be connected to the steel rod 4 through threaded rotation.

[0028] like Figures 1 to 7As shown, in a specific embodiment, the specifications and sizes of the lower steel casing 52 and the upper steel casing 54 are different. The diameter of the lower steel casing 52 is more than 50 mm larger than the diameter of the steel rod 4, the diameter of the upper steel casing 54 is more than 50 mm larger than the diameter of the fastening nut 411, the diameter of the lower steel casing 52 is smaller than the diameter of the upper steel casing 54, and the upper surface of the upper steel casing 54 is flush with the top of the concrete base plate 3.

[0029] like Figures 1 to 7 As shown, further, an installation groove 521 is provided on the outer wall of the lower steel casing 52, a through hole 522 is provided inside the installation groove 521, and the sliding sleeve 523 is rotatably installed on the outside of the installation groove 521, and the size of the through hole 522 is adapted to the size of the injection hole 524. The through hole 522 and the filling cavity 525 provided inside the sliding sleeve 523 are connected to each other, and the injection hole 524 on the sliding sleeve 523 is matched with the through hole 522, and then the retarding agent 526 is filled into the filling cavity 525 inside the lower steel casing 52 through the injection hole 524 and the through hole 522, wherein the installation groove 521 serves the purpose of limiting the rotation position.

[0030] Example 3, based on Example 2 and different from this example: Figures 1 to 7As shown, the elastic steel plate 55 is arc-shaped, and the protrusion on the surface of the elastic steel plate 55 is aligned with the center position of the sliding sleeve 523, and the protrusion is in contact with the surface of the extrusion plate 56. L-shaped connecting seats 551 are installed at both ends of the elastic steel plate 55, and the two L-shaped connecting seats 551 are respectively in contact with the lower supporting steel plate 51 and the upper supporting steel plate 53, and a locking bolt 552 is installed between the two. A synchronization rod 561 is installed through the extrusion plate 56. Limiting sliders 562 are installed at both ends of the synchronization rod 561. Limiting grooves 563 are defined on the opposing surfaces of the lower and upper steel plates 51 and 53. Limiting sliders 562 slide in the corresponding limiting grooves 563. Limiting rods 564 are installed through the sidewalls of the limiting grooves 563. The limiting rods 564 and the limiting sliders 562 flexibly intersect. A limiting spring 565 is sleeved onto the sidewalls of the limiting rods 564. One end of the limiting spring 565 engages the sidewall of the limiting groove 563, and the other end engages the sidewall of the limiting slider 562. The curvature diameter corresponding to the first curved surface 571 is smaller than the curvature diameter corresponding to the second curved surface 573. A blocking fence 574 is installed between the lower and upper steel plates 51 and 53. The blocking fence 574 corresponds to the sidewall of the slide 57. The surface where the extrusion plate 56 connects to the slide 57 is chamfered. During the rotation of the sleeve 523, the slide 57 on the side wall of the sleeve 523 can slide synchronously. When the slide 57 moves, the contact position between the slide 57 and the extrusion plate 56 changes. At this time, the switching surface 572 on the slide 57 guides the extrusion plate 56 to slide from the first curved surface 571 to the second curved surface 573. Since the curvature radius of the second curved surface 573 is large, the extrusion plate 56 is pushed to slide outward by the second curved surface 573. When the extrusion plate 56 slides, the synchronization rod 561 on the extrusion plate 56 can slide synchronously, and the limit slider 562 on the synchronization rod 561 slides on the limit slide groove 563, and the limit slider 562 is still sliding on the limit rod 564 at this time. During the sliding movement, the limit spring 565 is synchronously compressed, and the limit spring 565 facilitates the subsequent reset operation. When the extrusion plate 56 slides, the extrusion plate 56 squeezes the arch of the surface of the elastic steel plate 55. At this time, the elastic steel plate 55 subjected to the extrusion force squeezes the lower supporting steel plate 51 and the upper supporting steel plate 53 through the L-shaped connecting seat 551, thereby applying prestress, and finally increasing the prestress application position. At this time, the stress state of the anchor pile 111 is more reasonable, and the internal stress distribution is more uniform, which can reduce the local high stress area caused by frequent buoyancy loading and unloading, and can effectively delay the fatigue damage and corrosion of the anchor pile material, thereby extending the service life of the anti-floating anchor pile and reducing the later maintenance cost.

[0031] The present invention also discloses a construction method of a prestressed anti-floating anchor pile slow-bonding anchoring device, which comprises the following steps: Step 1: Excavate the foundation soil 1 to the designed elevation, construct a concrete cushion layer 12, use a drilling machine to form holes and grouting to form anchor piles 111, and insert steel rods 4 into the anchor piles 111; Step 2: Install waterproof board 2; Step 3: Install the anchor assembly 5, insert the lower bearing steel plate 51, the lower steel casing 52, the upper bearing steel plate 53, and the upper steel casing 54 onto the steel rod 4, and then fill the lower steel casing 52 with a slow-adhesive agent 526 through the through-hole 522 on the lower steel casing 52. When the filling is complete, the operator rotates the sliding sleeve 523 so that the injection hole 524 on the sliding sleeve 523 is staggered with the through-hole 522, thereby sealing the lower steel casing 52 as a whole. Step 4: During the rotation of the sliding sleeve 523, the sliding seat 57 on the side wall of the sliding sleeve 523 slides synchronously, and the switching surface 572 on the sliding seat 57 guides the extrusion plate 56 to slide from the first curved surface 571 to the second curved surface 573. The extrusion plate 56 is pushed outward by the second curved surface 573, and then the extrusion plate 56 squeezes the elastic steel plate 55. At this time, the elastic steel plate 55 under the squeezing force squeezes the lower steel plate 51 and the upper steel plate 53, thereby applying prestress; Step 5: Install the concrete base plate 3 by pouring the concrete base plate 3 so that the concrete base plate 3 wraps the entire anchor assembly; Step 6: After the concrete of the concrete base plate 3 reaches the designed strength, a hydraulic torque device is used to rotate the fastening nut 411 to drive the steel rod 4 upward, thereby applying prestress to the concrete base plate 3 and the anchor pile 111 .

[0032] The implementation principle of the prestressed anti-floating anchor pile slow-bonding anchoring device and its construction method of the present invention is as follows: the foundation soil 1 is excavated to the designed elevation, a concrete cushion layer 12 is constructed, a drilling rig is used to form a hole and grouting to form an anchor pile 111, a steel rod 4 is inserted into the anchor pile 111, and then a waterproof board 2 is installed.

[0033] Install the anchor assembly 5, insert the lower supporting steel plate 51, the lower steel casing 52, the upper supporting steel plate 53 and the upper steel casing 54 on the steel rod 4, then match the injection hole 524 on the sliding sleeve 523 with the through hole 522, and then fill the retarding agent 526 into the filling cavity 525 inside the lower steel casing 52 through the injection hole 524 and the through hole 522. When the filling is completed, the operator needs to rotate the sliding sleeve 523 so that the injection hole 524 on the sliding sleeve 523 is staggered with the through hole 522. At this time, the sliding sleeve 523 rotates to a certain extent, and the sliding sleeve 523 seals the through hole 522, so that the retarding agent 526 inside the filling cavity 525 will not overflow.

[0034] During the rotation of the sleeve 523, the slide 57 on the side wall of the sleeve 523 can slide synchronously. When the slide 57 moves, the contact position between the slide 57 and the extrusion plate 56 changes. At this time, the switching surface 572 on the slide 57 guides the extrusion plate 56 to slide from the first curved surface 571 to the second curved surface 573. Since the curvature radius of the second curved surface 573 is large, the extrusion plate 56 is pushed to slide outward by the second curved surface 573. When the extrusion plate 56 slides, the synchronization rod 561 on the extrusion plate 56 can slide synchronously, and the limit slider 562 on the synchronization rod 561 slides on the limit slide groove 563, and the limit slider 562 is still sliding on the limit rod 564 at this time. During the sliding movement, the limit spring 565 is synchronously compressed, and the limit spring 565 facilitates the subsequent reset operation.

[0035] When the extrusion plate 56 slides, the extrusion plate 56 squeezes the arch of the surface of the elastic steel plate 55. At this time, the elastic steel plate 55 subjected to the extrusion force squeezes the lower supporting steel plate 51 and the upper supporting steel plate 53 through the L-shaped connecting seat 551, thereby applying prestress, and finally increasing the prestress application position. At this time, the stress state of the anchor pile 111 is more reasonable, and the internal stress distribution is more uniform, which can reduce the local high stress area caused by frequent buoyancy loading and unloading, and can effectively delay the fatigue damage and corrosion of the anchor pile material, thereby extending the service life of the anti-floating anchor pile and reducing the later maintenance cost.

[0036] Then the operator casts the concrete base plate 3 by pouring, and the concrete base plate 3 wraps the entire anchor assembly, wherein the concrete base plate 3 is provided with tie bars 31 inside, and the tie bars 31 can improve the overall structural strength of the concrete base plate 3.

[0037] After the concrete of the concrete base plate 3 reaches the designed strength, a hydraulic torque device is used to rotate the fastening nut 411 to drive the steel rod 4 to rise, thereby applying prestress to the concrete base plate 3 and the anchor pile 111.

Claims

1. A prestressed anti-floating anchor pile slow-bonding anchoring device, characterized in that: include: A foundation soil body (1), a concrete cushion layer (12) is cast on the foundation soil body (1), and anchor piles (111) are cast inside the foundation soil body (1) and the concrete cushion layer (12); A waterproof board (2), the waterproof board (2) being arranged on a concrete cushion layer (12); An anchor assembly (5), the anchor assembly (5) comprising a lower bearing steel plate (51), a lower steel casing (52), an upper bearing steel plate (53) and an upper steel casing (54), the lower bearing steel plate (51) being overlapped on the waterproof plate (2), the lower steel casing (52) being welded on the lower bearing steel plate (51), the upper bearing steel plate (53) being welded on the top of the lower steel casing (52), the upper steel casing (54) being welded on the upper bearing steel plate (53), three elastic steel plates (55) being arranged around the upper bearing steel plate (53) and the lower bearing steel plate (51), and a sliding sleeve (52) being rotatably mounted on the outer side wall of the lower steel casing (52). 3) An injection hole (524) is provided on the sliding sleeve (523), and the injection hole (524) corresponds to the through hole (522) provided on the side wall of the lower steel casing (52). A sliding seat (57) is installed on the side wall of the sliding sleeve (523), and a first curved surface (571), a switching surface (572) and a second curved surface (573) are provided on the surface of the sliding seat (57). The switching surface (572) is used to connect the first curved surface (571) and the second curved surface (573). An extrusion plate (56) is slidably provided on the surface of the sliding seat (57), and the end of the extrusion plate (56) is in contact with the surface of the corresponding elastic steel plate (55); A concrete base plate (3), wherein the bottom of the concrete base plate (3) is connected to the waterproof plate (2), and the concrete base plate (3) is cast outside the anchor assembly (5); A steel rod (4) is provided, wherein the steel rod (4) passes through the anchor assembly (5), the waterproof plate (2) and the anchor pile (111); a thread (41) is provided on the steel rod (4), and a fastening nut (411) is screwed on the thread, and the fastening nut (411) is attached to the upper steel casing (54); and a cavity formed between the steel rod (4) and the sliding sleeve (523) is filled with a slow-adhesion agent (526).

2. A prestressed anti-floating anchor pile slow-bonding anchoring device according to claim 1, characterized in that: Pile holes (11) are drilled on the surface of the foundation soil (1) and the concrete cushion layer (12), and the two pile holes (11) have the same diameter and are positioned vertically correspondingly. The anchor piles (111) are installed on the pile holes (11).

3. The prestressed anti-floating anchor pile slow-bonding anchoring device according to claim 1, characterized in that: The connection between the waterproof plate (2) and the steel rod (4) is filled with a sealant (21), a plurality of pairs of reinforcing bars (31) are integrally cast inside the concrete base plate (3), and the upper steel casing (54) is filled with an anchor mortar (541), which covers the outside of the fastening nut (411).

4. The prestressed anti-floating anchor pile slow-bonding anchoring device according to claim 1, characterized in that: The centers of the lower supporting steel plate (51), the lower steel casing (52), the upper supporting steel plate (53) and the upper steel casing (54) are all on the same vertical straight line. The lower supporting steel plate (51) and the upper supporting steel plate (53) are circular plates, and a threaded groove through hole is opened at the center position of the lower supporting steel plate (51) and the upper supporting steel plate (53). The size of the threaded groove through hole is mutually adapted to the size of the thread (41) on the surface of the steel rod (4).

5. The prestressed anti-floating anchor pile slow-bonding anchoring device according to claim 1, characterized in that: The lower steel casing (52) and the upper steel casing (54) have different specifications and sizes. The diameter of the lower steel casing (52) is greater than the diameter of the steel rod (4) by more than 50 mm, and the diameter of the upper steel casing (54) is greater than the diameter of the fastening nut (411) by more than 50 mm. The diameter of the lower steel casing (52) is smaller than the diameter of the upper steel casing (54), and the upper surface of the upper steel casing (54) is flush with the top of the concrete base plate (3).

6. The prestressed anti-floating anchor pile slow-bonding anchoring device according to claim 1, characterized in that: The outer wall of the lower steel casing (52) is provided with a mounting groove (521), the through hole (522) is provided inside the mounting groove (521), the sliding sleeve (523) is rotatably installed outside the mounting groove (521), the size of the through hole (522) and the size of the injection hole (524) are mutually adapted, the through hole (522) and the filling cavity (525) provided inside the sliding sleeve (523) are communicated with each other, and the slow-adhesion agent (526) is injected into the filling cavity (525).

7. The prestressed anti-floating anchor pile slow-bonding anchoring device according to claim 1, characterized in that: The elastic steel plate (55) is arc-shaped, and the protrusion on the surface of the elastic steel plate (55) is aligned with the center position of the sliding sleeve (523), and the protrusion is in contact with the surface of the extrusion plate (56). L-shaped connecting seats (551) are installed at both ends of the elastic steel plate (55), and the two L-shaped connecting seats (551) are respectively in contact with the lower supporting steel plate (51) and the upper supporting steel plate (53), and a locking bolt (552) is installed between the two.

8. The prestressed anti-floating anchor pile slow-bonding anchoring device according to claim 1, characterized in that: A synchronization rod (561) is installed through the inside of the extrusion plate (56), and limit sliders (562) are installed at both ends of the synchronization rod (561). Limiting slots (563) are provided on the relative surfaces of the lower supporting steel plate (51) and the upper supporting steel plate (53). The limit slider (562) is slidably arranged in the corresponding limit slot (563). A limiting rod (564) is installed through the side wall of the limit slot (563). The limiting rod (564) and the limit slider (562) are movably inserted. A limiting spring (565) is sleeved on the side wall of the limiting rod (564). One end of the limiting spring (565) is clamped on the side wall of the limiting slot (563), and the other end is clamped on the side wall of the limiting slider (562).

9. The prestressed anti-floating anchor pile slow-bonding anchoring device according to claim 1, characterized in that: The curvature diameter corresponding to the first curved surface (571) is smaller than the curvature diameter corresponding to the second curved surface (573), and a blocking fence (574) is installed between the lower supporting steel plate (51) and the upper supporting steel plate (53), and the blocking fence (574) corresponds to the side wall of the slide seat (57), and the surface where the extrusion plate (56) is connected to the slide seat (57) is chamfered.

10. A construction method for a prestressed anti-floating anchor pile slow-bonding anchoring device, characterized in that: The construction method of the prestressed anti-floating anchor pile slow-bonding anchoring device according to any one of claims 1 to 9 is as follows: Step 1: excavate the foundation soil (1) to the designed elevation, construct a concrete cushion layer (12), use a drilling machine to form holes and grouting to form anchor piles (111), and insert steel rods (4) into the anchor piles (111); Step 2: Install waterproof board (2); Step 3: Install the anchor assembly (5), insert the lower supporting steel plate (51), the lower steel casing (52), the upper supporting steel plate (53) and the upper steel casing (54) on the steel rod (4), and then fill the lower steel casing (52) with a slow-adhesive agent (526) through the through hole (522) on the lower steel casing (52). When the filling is completed, the operator rotates the sliding sleeve (523) so that the injection hole (524) on the sliding sleeve (523) and the through hole (522) are staggered and respectively, thereby sealing the lower steel casing (52) as a whole; Step 4: During the rotation of the sliding sleeve (523), the sliding seat (57) on the side wall of the sliding sleeve (523) slides synchronously, and the switching surface (572) on the sliding seat (57) guides the extrusion plate (56) to slide from the first curved surface (571) to the second curved surface (573), and the extrusion plate (56) is pushed to slide outward by the second curved surface (573), and then the extrusion plate (56) squeezes the elastic steel plate (55). At this time, the elastic steel plate (55) under the squeezing force squeezes the lower supporting steel plate (51) and the upper supporting steel plate (53), thereby applying prestress; Step 5: Install the concrete base plate (3), cast the concrete base plate (3) by pouring, and the concrete base plate (3) wraps the entire anchoring assembly; Step 6: After the concrete of the concrete base plate (3) reaches the designed strength, a hydraulic torque device is used to rotate the fastening nut (411) to drive the steel rod (4) upward, thereby applying prestress to the concrete base plate (3) and the anchor pile (111).

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