Pressure type anti-floating anchor rod and construction method thereof

Abstract

The invention relates to the technical field of rock-soil anchoring construction, in particular to a pressure type anti-floating anchor rod and a construction method thereof.The pressure type anti-floating anchor rod comprises an anchor rod body, a fixing section is arranged at the bottom of the anchor rod body, and a plurality of bearing bodies are arranged above the anchor rod body; the concrete cushion is located around the top end of the anchor hole; the bearing plate is arranged on the anchor rod body in a sleeving mode and located above the concrete cushion layer; the water swelling rubber water stop strip is arranged between the concrete cushion layer and the bearing plate; after the prestress of the anchor rod is applied, the water swelling rubber water stop strip is pressed between the bearing plate and the concrete cushion layer; the waterproof layer is located on the upper side of the concrete cushion layer and makes contact with the concrete cushion layer in an attached mode. The waterproof expansion water stop strip is arranged between the concrete cushion layer and the bearing plate, liquid leakage of underground water along the anchor hole can be effectively prevented, meanwhile, the waterproof layer and the concrete cushion layer are laid, and the waterproof performance of the underground structure is guaranteed to the maximum degree.

Description

Technical Field

[0001] The present invention relates to the technical field of geotechnical anchoring construction, and in particular to a pressure-type anti-floating anchor rod and its construction method. Background Art

[0002] The anti-floating anchor rod is a kind of anti-floating measure for the underground structure of a building project. It is set in the underground structure and can effectively balance the buoyancy of groundwater on the building, ensuring the stability and safety of the building. When the buried depth of the anchoring bearing layer is large, the required length of the anchor rod is large, and the displacement of the anchor head exceeds the limit value (design requirement), prestressed anchor rods should be used.

[0003] During the construction of the basement foundation slab, holes need to be reserved, resulting in subsequent plugging work for the reserved holes and potential water leakage problems. For prestressed anchor rods with waterproof requirements, the current national "Technical Standard for Anti-Floating of Building Engineering" (JGJ476-2019) stipulates that the waterproof grade of the connection part between the anti-floating anchor rod and the underground structure floor slab should not be lower than the corresponding waterproof grade of the underground structure, and the waterproof material should be reliably connected to the waterproof layer of the underground structure, and the waterproof requirements for the connection part between the anti-floating anchor rod with a waterproof grade of level one and the underground structure floor slab.

[0004] For example, the Chinese invention patent with the publication number CN114482142A discloses a large-diameter precision rolled threaded steel anti-floating anchor rod, which adopts a variety of waterproof measures, such as setting waterproof coatings, waterproof layers, and waterproof collar rings, etc. However, due to the existence of multiple adjacent structures, such as waterproof coatings, pre-tightening force steel plates, and waterproof layers, there are inevitably irregular surfaces, cavities, and gaps at the joints, and water leakage may occur later. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a pressure-type anti-floating anchor rod and its construction method. By setting a waterproof expansion water stop strip between the concrete cushion and the bearing plate, the present invention can effectively prevent the liquid leakage of groundwater along the anchor hole. At the same time, a waterproof layer and a concrete cushion are laid to maximize the waterproof performance of the underground structure. To achieve the above purpose, the present invention is realized through the following technical solutions:

[0006] In the first aspect, the present invention provides a pressure-type anti-floating anchor rod, including:

[0007] An anchor rod body, with a fixed section at the bottom and several load-bearing bodies above it;

[0008] A concrete cushion, located around the top of the anchor hole;

[0009] A bearing plate, sleeved on the anchor rod body and located above the concrete cushion;

[0010] A water-swelling rubber water stop strip is arranged between the concrete cushion layer and the pressure plate; after the anchor rod prestress is applied, the water-swelling rubber water stop strip is pressed tightly between the pressure plate and the concrete cushion layer;

[0011] The waterproof layer is located on the upper side of the concrete cushion layer and is in close contact with the concrete cushion layer.

[0012] As a further implementation method, it also includes a spiral rib and a pad sleeved on the anchor rod body, the spiral rib is located on the upper side of the pressure plate, and the pad cooperates with a fixing nut to apply pressure to the spiral rib.

[0013] As a further implementation, the anchor rod body is coated with an anti-corrosion coating.

[0014] As a further implementation, the carrier is provided with an internal thread, and the anchor rod body is provided with an external thread that cooperates with the carrier thread.

[0015] As a further implementation, the carrier is provided with holes for the grouting pipe and the exhaust pipe to pass through.

[0016] As a further implementation, the number of the carriers is at least five and they are arranged at equal intervals up and down.

[0017] In a second aspect, the present invention provides a construction method of the pressure-type anti-floating anchor according to the first aspect, comprising the following steps:

[0018] Apply anti-corrosion coating to the anchor rod body, wait for it to solidify, install the carrier body in sequence, place the grouting pipe and the exhaust pipe on the carrier body, and put the anchor rod body into the set depth of the anchor hole; grouting is carried out into the anchor hole through the grouting pipe until the anchor hole is completely filled with the grouting body, and the first grouting is completed; the gap between the lower bottom surface of the pressure plate and the concrete cushion layer is filled with a water-swelling rubber waterstop strip, and then the pressure plate is equipped with a locking nut; secondary grouting is carried out through the grouting pipe by pressure grouting, and excess bubbles are discharged through the exhaust pipe; prestressing is applied to the anchor rod, and spiral reinforcement is placed on the anchor rod body.

[0019] As a further implementation method, a centering device is arranged on the anchor rod body, and a positioning tripod is placed at the opening of the anchor hole, so that the anchor rod body is located at the center of the anchor hole with the cooperation of the centering device and the positioning tripod.

[0020] As a further implementation method, during the process of applying prestress to the anchor rod, the pressure beam, through-hole jack, pad and fixing nut are sequentially mounted on the anchor rod body from bottom to top. After the anchor rod is prestressed using the through-hole jack, the pressure plate is locked and the prestressing tool is removed.

[0021] As a further implementation method, after the prestress application tool is disassembled, the spiral reinforcement is sleeved on the anchor rod body, and pressure is applied to it through the backing plate and the fixing nut.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1. The present invention sets a waterproof expansion water stop strip between the concrete cushion and the bearing plate, which can effectively prevent the liquid leakage of groundwater along the anchor hole. At the same time, a waterproof layer and a concrete cushion are laid to maximize the waterproof performance of the underground structure.

[0024] 2. The present invention sets 5 load-bearing bodies on the anchor rod body. The 5 load-bearing bodies can jointly bear the buoyancy resistance, ensure that the pressure-type anti-floating anchor rod is not damaged, and can provide sufficient buoyancy resistance. During use, the failure probability of the load-bearing body is greatly reduced, avoiding damage due to insufficient strength and stiffness, and reducing instability failure.

[0025] 3. The spiral reinforcement set by the present invention plays the role of stirrups after the concrete foundation slab is poured, which can effectively increase the contact area between the anchor rod body and the concrete foundation slab, greatly improve the anchoring strength between the anchor rod body and the concrete foundation slab, reduce the slip deformation between the concrete foundation slab and the anti-floating anchor rod, enhance the integrity and structure of the anti-floating anchor rod, and at the same time can reduce the prestress loss of the anti-floating anchor rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The schematic drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0027] Figure 1 It is a schematic diagram of the overall structure of the pressure-type anti-floating anchor rod in the embodiment of the present invention.

[0028] Figure 2 It is a schematic diagram of the installation of the anchor rod body in the embodiment of the present invention.

[0029] Figure 3 It is a schematic diagram of the prestress loading of the anchor rod in the embodiment of the present invention.

[0030] Figure 4 It is a schematic diagram of the structure of the load-bearing body in the embodiment of the present invention.

[0031] Figure 5 It is a schematic diagram of the assembly of the load-bearing body, the grouting pipe and the exhaust pipe in the embodiment of the present invention.

[0032] Figure 6 It is a top view of the structure of the centering device in the embodiment of the present invention.

[0033] Figure 7 It is a front view of the structure of the centering device in the embodiment of the present invention.

[0034] Figure 8 It is a schematic diagram of the positioning tripod structure in the embodiment of the present invention.

[0035] Figure 9 It is a top view of the installation of the anchor rod body in the embodiment of the present invention.

[0036] In the figure: The distances or sizes between each part are exaggerated for showing the positions of each part, and the schematic diagram is only for illustration.

[0037] Among them: 1. Centering device; 2. Positioning tripod; 3. Concrete cushion; 4. Anchor rod body; 5. Grouting body; 6. Bearing body; 7. Anchor hole; 8. Fixed section; 9. Fixed nut; 10. Base plate; 11. Jack with hole; 12. Bearing beam; 13. Locking nut; 14. Bearing plate; 15. Water swelling rubber water stop strip; 16. Waterproof layer; 17. Spiral reinforcement; 18. Grouting pipe; 19. Exhaust pipe. Specific implementation manners

[0038] It should be noted that the following detailed description is exemplary and is intended to provide further illustration of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0039] Embodiment 1

[0040] In a typical implementation manner of the present invention, referring to Figure 1 as shown, a pressure - type anti - floating anchor rod includes an anchor rod body 4, a concrete cushion 3, a bearing plate 14, a water swelling rubber water stop strip 15 and a waterproof layer 16.

[0041] The bottom of the anchor rod body 4 is provided with a fixed section 8 and several bearing bodies 6 are arranged above it; the anchor rod body 4 is a PSB precision rolled thread steel with a diameter of 20 - 35 mm, and the specific diameter is determined according to construction requirements. In this embodiment, a PSB precision rolled thread steel with a diameter of 32 mm is used.

[0042] An anti - corrosion coating is applied on the anchor rod body 4. The anti - corrosion coating can form a dense protective film, effectively isolating moisture and oxygen, thereby slowing down the corrosion rate of the metal and significantly extending its service life.

[0043] Such as Figure 1 , Figure 4 and Figure 5As shown in the figure, the carrier 6 is made of Q335B steel and is in the structure of a circular plate. There are a total of 5 holes, one central hole with a diameter of 32 mm, which matches the diameter of the anchor rod body 4. The anchor rod body 4 is provided with external threads and is in threaded cooperation with the carrier 6, and is integrally formed with the anchor rod body 4 by welding. It can be understood that the carrier 6 may not be provided with threads and is fixed by welding after being placed in the specified position; there are 4 external holes with a diameter of 10 mm for passing the grouting pipe 18 and the exhaust pipe 19. The number of carriers 6 is at least set to 5. In this embodiment, there are 5 carriers 6. The distance from the bottom carrier to the fixed section 8 of the anchor rod body is 300 mm, and the remaining carriers are arranged at equal intervals of 300 mm.

[0044] In this embodiment, 5 carriers 6 are provided on the anchor rod body 4. The 5 carriers 6 can jointly bear the buoyancy resistance, ensure that the pressure-type anti-floating anchor is not damaged, and can provide sufficient buoyancy resistance. During the use process, the failure probability of the carrier 6 is greatly reduced, avoiding damage due to insufficient strength and stiffness, and reducing instability failure.

[0045] The concrete cushion 3 is located around the top of the anchor hole 7.

[0046] The bearing plate 14 is sleeved on the anchor rod body 4 and is located above the concrete cushion 3; the bearing plate 14 is made of Q235B or Q335B steel. The bearing plate 14 is made of a square steel plate of 250×250×10 mm. Holes need to be reserved in the middle and at the corners. The diameter of the middle hole is adjusted according to the diameter of the anchor rod body and needs to match the diameter of the anchor rod body 4. The reserved hole diameter is 32 mm, which allows the anchor rod body 4 to pass through the reserved hole. The diameter of the corner hole is adjusted according to the diameter of the grouting pipe 18, and it only needs to allow the grouting pipe 18 to pass freely. The bearing plate 14 is located below the locking nut 13, and the two together play a role in locking the prestress. Below the bearing plate 14 are the anchor hole 7 and the concrete cushion 3 at the anchor hole opening.

[0047] The water-swelling rubber waterstop strip 15 is provided between the concrete cushion 3 and the bearing plate 14; after the prestress of the anchor rod is applied, the water-swelling rubber waterstop strip 15 is pressed tightly between the bearing plate 14 and the concrete cushion 3; the water-swelling rubber waterstop strip 15 can be in the specifications of 30×20, 20×15, 30×40 mm. Compared with the ordinary rubber waterstop strip, the water-swelling rubber waterstop strip 15 produces 2-3 times of swelling deformation after encountering water, fills all irregular surfaces, cavities and gaps of the joint, and at the same time generates a huge contact pressure, completely preventing leakage. The water-swelling rubber waterstop strip 15 is placed around the orifice of the anchor hole 7 to play a role in preventing groundwater leakage. In this embodiment, the water-swelling rubber waterstop strip 15 of 30×20 mm is adopted.

[0048] The waterproof layer 16 is located on the upper side of the concrete cushion 3 and is in close contact.

[0049] A waterproof expansion waterstop strip is arranged between the concrete cushion layer 3 and the bearing plate 14, which can effectively prevent the liquid leakage of groundwater along the anchor holes. At the same time, the waterproof layer 16 and the concrete cushion layer 3 are laid, which maximally guarantees the waterproof performance of the anti-floating anchor rod system.

[0050] It also includes a spiral reinforcement 17 and a backing plate 10 sleeved on the anchor rod body 4. The spiral reinforcement 17 is located above the bearing plate 14, and the backing plate 10 cooperates with the fixing nut 9 to apply pressure to the spiral reinforcement 17.

[0051] The backing plate 10 is made of steel of Q235B or Q335B material, and is made of a square steel plate of 200×200×10mm. A hole needs to be reserved in the middle, and the diameter of the hole is adjusted according to the diameter of the anchor rod, and it needs to match the diameter of the anchor rod body 4. The anchor rod body 4 can pass through the reserved hole. The spiral reinforcement 17 is connected below the backing plate 10, so that the spiral reinforcement 17 is compressed to a certain extent to ensure that the spiral reinforcement 17 is firmly fixed and centered. In this embodiment, the backing plate 10 is made of Q335B steel, and the diameter of the reserved hole is 32mm.

[0052] The spiral reinforcement 17 is made of HRB400 spiral reinforcement with a diameter of 10mm, and the pitch of the spiral reinforcement is 50mm. The spiral reinforcement 17 plays the role of stirrups after the concrete foundation slab is poured, which can effectively increase the contact area between the anchor rod body 4 and the concrete foundation slab, greatly improve the anchoring strength between the anchor rod body 4 and the concrete foundation slab, reduce the slip deformation between the concrete foundation slab and the anti-floating anchor rod, enhance the integrity and structure of the anti-floating anchor rod, and at the same time can reduce the prestress loss of the anti-floating anchor rod.

[0053] The fixing nut 9 and the locking nut 13 are made of steel of Q235B or Q335B material, the wall thickness can be between 4 and 8mm, and the inner diameter can be between 32 and 40mm. It is adjusted according to the diameter of the anchor rod and needs to be coupled with the diameter of the anchor rod body 4. There is a thread on the inner side, so that the fixing nut 9 and the locking nut 13 can be threadedly connected with the anchor rod body 4 and firmly fixed. The fixing nut 9 is located above the backing plate 10, and the two cooperate to fix the spiral reinforcement 17 together to make it firmly fixed and centered. The locking nut 13 is located above the bearing plate 14 and plays the role of locking the prestress. The spiral reinforcement 17 is connected above the locking nut 13. In this embodiment, the fixing nut 9 and the locking nut 13 are made of Q335B steel, the inner diameter is 32mm, and the wall thickness is 6mm.

[0054] Embodiment 2

[0055] This embodiment provides a construction method of the pressure-type anti-floating anchor rod described in Embodiment 1, including the following steps:

[0056] S101. Assembly of the anchor rod body and its upper structure

[0057] Coat the anchor rod body 4 with epoxy anti-corrosion coating and let it stand for 24 hours to cure and form an anti-corrosion coating. The anchor rod body 4 passes through the central holes of 5 carrier bodies 6 in sequence, is screwed to the designated position on the anchor rod body 4, and the 5 carrier bodies 6 are welded respectively. Among them, the distance from the bottommost carrier body to the fixed section 8 of the anchor rod body is 300 mm, and the remaining carrier bodies are arranged at equal intervals of 300 mm.

[0058] Then, rotate and install the centering device 1 at the designated position on the anchor rod body 4 (as shown in Figure 2 , Figure 6 and Figure 7 ), and the two are threadedly connected and firmly fixed to ensure that the anchor rod body 4 is located at the center of the anchor hole 7 during installation, playing a role in positioning and fixing the anchoring length.

[0059] The specific structure of the centering device 1 is an existing technology and is made of steel of Q235B or Q335B material. The wall thickness can be between 3 and 5 mm, and the inner diameter is between 32 and 40 mm. It is adjusted according to the diameter of the anchor rod body 4 and needs to match the diameter of the anchor rod body 4. Threads are provided on the inner side, so that the inner wall of the centering device 1 can be coupled with the threads on the outer surface of the anchor rod body 4, and the two are threadedly connected and firmly fixed. In this embodiment, the centering device 1 is made of Q335B steel, with an inner diameter of 32 mm and a wall thickness of 5 mm.

[0060] Finally, place the grouting pipe 18 and the exhaust pipe 19. The two respectively pass through the holes reserved outside the 5 carrier bodies 6 in sequence and reach 200 cm above the fixed section 8 of the anchor rod body through the 5 carrier bodies 6 in sequence.

[0061] The grouting pipe 18 is made of PVC pipe with a diameter of 10 mm, which matches the diameter of the holes outside the carrier body 6. During the installation of the anchor rod, the grouting pipe 18 passes through the 5 carrier bodies 6 in sequence to reach 200 cm above the fixed section 8 of the anchor rod body, ensuring full grouting, improving the grouting density and strength, and avoiding cavities.

[0062] The exhaust pipe 19 is made of PVC pipe with a diameter of 10 mm, which matches the diameter of the holes outside the carrier body 6. During the installation of the anchor rod, the exhaust pipe 19 passes through the 5 carrier bodies 6 in sequence to reach 200 cm above the fixed section 8 of the anchor rod body, and can timely exhaust the air in the anchor hole 7 during grouting, ensuring that the slurry completely fills the pores and improving the bonding strength.

[0063] As shown in Figure 9 , place the anchor rod body 4 in the anchor hole 7. When the centering device 1 approaches the orifice position of the anchor hole 7, place the positioning tripod 2, and then continue to place the anchor rod downward until the centering device 1 touches the positioning tripod 2, and stop placing the anchor rod body 4, so that the anchor rod body 4 is placed within a certain length in the anchor hole 7 and the anchor rod body 4 is located at the center of the anchor hole 7.

[0064] As shown in Figure 8As shown in the figure, the positioning tripod 2 is made of Q335B steel with a diameter of 10 mm. It is in the shape of an isosceles triangle with an open bottom and is placed on the anchor hole 7. When installing the anchor bolt, the positioning tripod 2 allows the anchor bolt rod body 4 to pass through but does not allow the centering device 1 to pass through, thus playing a role in positioning and fixing the anchoring length.

[0065] S102. Inject grout into the anchor hole 7 through the grouting pipe 18 until the grouting body 5 completely fills the anchor hole 7, and then end the primary grouting.

[0066] S103. Install the water-swelling rubber water stop strip

[0067] The gap between the lower bottom surface of the bearing plate 14 and the concrete cushion 3 is filled with the water-swelling rubber water stop strip 15. The water-swelling rubber water stop strip 15 is placed around the periphery of the anchor hole 7, and its diameter is slightly larger than that of the anchor hole 7. In this embodiment, the diameter of the anchor hole is 150 mm, and the diameter of the circle formed by the water-swelling rubber water stop strip 15 placed around it can be 160 mm. Remove the positioning tripod 2, and put the bearing plate 14 on the anchor bolt rod body 4 through the central reserved hole, so that the lower bottom surface of the bearing plate 14 contacts the concrete cushion 3. The grouting pipe 18 and the exhaust pipe 19 pass through the external holes of the bearing plate 14 and wait for secondary grouting. The gap between the lower bottom surface of the bearing plate 14 and the concrete cushion 3 is filled with the water-swelling rubber water stop strip 9. Then, place the locking nut 13 on the anchor bolt rod body 4 above the bearing plate 14 to ensure that the anchor bolt rod body 4 does not deviate from its position.

[0068] S104. Secondary grouting

[0069] When the slurry in the primary grouting begins to set but is not completely cured, secondary grouting is carried out through the grouting pipe 18 by means of pressure grouting, and the excess air bubbles are discharged through the exhaust pipe 19. Specifically, secondary grouting is carried out through the grouting pipe 18 passing through the external holes of the bearing plate 14 by means of pressure grouting to eliminate the voids. In addition, the excess air bubbles are discharged through the exhaust pipe 19 passing through the external holes of the bearing plate 14 to make the grouting body dense and ensure the strength after the grouting body solidifies. When the grouting body in the anchor hole is completely dense, the excess air bubbles are discharged and the voids are eliminated, then end the secondary grouting. Subsequently, withdraw the grouting pipe 18 and the exhaust pipe 19 from the holes reserved at the corners of the bearing plate 14.

[0070] S105. Prestress application

[0071] As Figure 3As shown in the figure, lay the waterproof layer 16. After the grouting body 5 is completely solidified, the bearing beam 12, the through-hole jack 11, the backing plate 10, and the fixing nut 9 are sleeved on the anchor rod body 4 through their respective reserved holes. After all are placed, start applying prestress. The through-hole jack 11 applies prestress to the anchor rod body 4. After the prestress is applied, use the locking nut 13 to lock the applied prestress. The applied prestress is generally 5 - 20t, and in actual application, it shall be subject to the design requirements. After the prestress is applied, a small amount of water can be sprinkled into the gap between the bearing plate 14 and the concrete cushion 3, so that the water-swelling rubber waterstop 15 swells to fill the gap between the bearing plate 14 and the concrete cushion 3 completely, thus achieving the waterproof effect and playing a certain role in positioning and fixing.

[0072] Compared with ordinary jacks, the through-hole jack 11 has a more convenient and flexible working state, and also has the advantages of high strength, light weight, and easy operation. When applying prestress, the bearing beam 12, the through-hole jack 11, the backing plate 10, and the fixing nut 9 are sleeved on the anchor rod body 4 through their respective reserved holes. The fixing nut 9 is firmly fixed to the anchor rod body 4, and the through-hole jack 11 is placed on the bearing beam 12. The through-hole jack 11 is used to apply prestress to the anchor rod body 4.

[0073] The bearing beam 12 is made of Q335B steel, with a support platform and two support legs (supported on the concrete cushion 3). The support platform is the pressure-bearing part with a thickness of 60mm and a length of 650mm. A hole needs to be reserved in the middle, and the diameter of the hole should ensure that the anchor rod body 4 can pass through freely. The through-hole jack 11 is arranged above the bearing beam 12 to bear the reaction force when applying prestress to the anchor rod body 4.

[0074] S106. Place the spiral reinforcement

[0075] After the prestress is applied and locked, the fixing nut 9, the backing plate 10, the jack 11, and the bearing beam 12 are removed from the anchor rod body 4 in sequence. Then the fixing nut 9, the backing plate 10, and the spiral reinforcement 17 are placed on the anchor rod body 4 in sequence. The spiral reinforcement 17 is straightened, and the fixing nut 9 is used to fix and compress the spiral reinforcement 17 through the backing plate 10 to ensure that the spiral reinforcement 17 can be vertically fixed at the end of the anchor rod body 4. The spiral reinforcement 17 plays the role of stirrups after the concrete floor slab is poured, enhancing the integrity and structural performance of the anchor rod body 4, increasing the anchorage length in effect, and increasing the contact area between the anchor rod body 4 and the concrete floor slab, reducing the slip between the floor slab and the rod body, and at the same time reducing the prestress loss of the anchor rod body 4.

[0076] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A pressure-type anti-floating anchor rod, characterized in that, Comprising: An anchor rod body, with a fixed section at the bottom and several load-bearing bodies above it; A concrete cushion, located around the top end of the anchor hole; A bearing plate, sleeved on the anchor rod body and located above the concrete cushion; A water-swellable rubber waterstop strip, arranged between the concrete cushion and the bearing plate; after the prestress of the anchor rod is applied, the water-swellable rubber waterstop strip is pressed tightly between the bearing plate and the concrete cushion; A waterproof layer, located on the upper side of the concrete cushion and in close contact.

2. The pressure-type anti-floating anchor rod according to claim 1, wherein, It also includes a spiral reinforcement and a backing plate sleeved on the anchor rod body. The spiral reinforcement is located above the bearing plate, and the backing plate cooperates with a fixing nut to apply pressure to the spiral reinforcement.

3. The pressure-type anti-floating anchor rod according to claim 1, characterized in that, The anchor rod body is coated with an anti-corrosion coating.

4. A pressure-type anti-floating anchor rod according to claim 1, characterized in that, The load-bearing body is provided with an internal thread, and the anchor rod body is provided with an external thread and is threadedly engaged with the load-bearing body.

5. The pressure type anti-floating anchor rod according to claim 4, characterized in that, The load-bearing body is reserved with holes for the grouting pipe and the exhaust pipe to pass through.

6. The pressure-type anti-floating anchor rod according to claim 1, wherein, The number of the load-bearing bodies is at least set to five and are arranged at equal intervals up and down.

7. The construction method of the pressure-type anti-floating anchor rod according to any one of claims 1-6, characterized in that, Including the following steps: Coat the anchor rod body with an anti-corrosion coating. After it cures, install the load-bearing bodies in sequence. Place the grouting pipe and the exhaust pipe on the load-bearing body, and place the anchor rod body into the anchor hole to a set depth; Grout into the anchor hole through the grouting pipe until the grouting body completely fills the anchor hole and then end the first grouting; Fill the gap between the lower bottom surface of the bearing plate and the concrete cushion with a water-swellable rubber waterstop strip, and then configure a locking nut for the bearing plate; Carry out secondary grouting through the grouting pipe in a pressure grouting manner and discharge the excess air through the exhaust pipe; Apply prestress to the anchor rod and place a spiral reinforcement on the anchor rod body.

8. The construction method of the pressure-type anti-floating anchor rod according to claim 7, characterized in that, Configure a centering device on the anchor rod body, and place a positioning tripod at the orifice of the anchor hole. With the cooperation of the centering device and the positioning tripod, the anchor rod body is located at the center of the anchor hole.

9. The construction method of the pressure-type anti-floating anchor rod according to claim 7, characterized in that, During the process of applying prestress to the anchor rod, sleeved the bearing beam, the through-hole jack, the backing plate and the fixing nut on the anchor rod body from bottom to top in sequence. After using the through-hole jack to apply prestress to the anchor rod, lock the bearing plate and remove the prestress application tool.

10. The construction method of the pressure-type anti-floating anchor rod according to claim 9, characterized in that, After the prestress application tool is removed, sleeve the spiral reinforcement on the anchor rod body and apply pressure to it through the backing plate and the fixing nut.

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