Pressure type threaded steel bar prestressed anti-floating anchor rod device

Abstract

The utility model discloses a pressure type threaded steel bar prestress anti -floating anchor rod device belongs to engineering construction technical field, including soil layer, concrete layer, prestressed reinforcement, bottom plate, fixed assembly, waterproof subassembly, anchoring subassembly, the soil layer is provided with installation pit, the concrete layer sets up on the installation pit department upper surface, the bottom plate is installed around the installation pit, the prestressed reinforcement is through the concrete layer and is installed in the soil layer, the fixed assembly is installed in the prestressed reinforcement bottom, the anchoring subassembly is installed in the prestressed reinforcement top, the waterproof subassembly is installed in the anchoring subassembly bottom, the utility model discloses a pressure type threaded steel bar prestress anti -floating anchor rod device above, through the pre -stress balance groundwater buoyancy, has realized effectively prevented the basement upheaval, bottom plate deformation etc.

Description

Technical Field

[0001] This utility model relates to the field of engineering construction technology, and in particular to a pressure-type threaded steel bar prestressed anti-buoyancy anchor device. Background Technology

[0002] In recent years, to better address land scarcity, the application of underground space has become increasingly widespread. This has led to the development of large underground structures in projects with shallow groundwater levels, such as underground or open-air swimming pools and large basements. Because these underground structures have large floor areas, deep foundations, and relatively few floors, their self-weight is insufficient to resist the buoyancy of groundwater at historically high groundwater levels, making the buoyancy problem of underground structures increasingly prominent. Summary of the Invention

[0003] The purpose of this invention is to provide a pressure-type threaded steel bar prestressed anti-buoyancy anchor device, which effectively prevents problems such as foundation heave and bottom plate deformation by applying prestress to balance the buoyancy of groundwater, thus ensuring the safety of underground space structures.

[0004] To achieve the above objectives, this utility model provides a pressure-type threaded steel bar prestressed anti-buoyancy anchor device, comprising a soil layer, a concrete layer, prestressed steel bars, a base plate, a fixing component, a waterproof component, and an anchoring component. An installation pit is formed in the soil layer, and the concrete layer is disposed on the upper surface of the installation pit. The base plate is installed around the installation pit. The prestressed steel bars penetrate the concrete layer and are installed within the soil layer. The fixing component is installed at the bottom of the prestressed steel bars. The anchoring component is installed at the top of the prestressed steel bars. The waterproof component is installed at the bottom of the anchoring component.

[0005] Preferably, the prestressed steel bars are installed in the soil layer by the fixing assembly, which includes a conical guide cap, an anchor, and a metal support body. The conical guide cap is installed at the bottom of the metal support body, the anchor is installed inside the metal support body, and the prestressed steel bars are installed inside the anchor of the metal support body.

[0006] Preferably, the outer surface of the prestressed steel bar is fitted with an isolation sleeve, the outer surface of the isolation sleeve is fitted with a heat shrink tube, and a positioning frame is also fitted outside the isolation sleeve. The positioning frame has a grouting hole, and grout is injected between the heat shrink tube and the hole wall.

[0007] Furthermore, grout is first injected between the heat-shrink tubing and the borehole wall. The heat-shrink tubing shrinks when heated, better encapsulating the isolation sleeve. Finally, a concrete layer is poured onto the soil layer. Using secondary grouting technology and prestressed steel reinforcement, the bond strength between the anchoring section and the soil layer is improved, allowing the pull-out bearing capacity characteristic value of a single anchor rod to meet design requirements. This further enhances the anchoring force.

[0008] Preferably, the inner side of the base plate is provided with the main reinforcement of the base plate, and a waterproof component is provided between the main reinforcement of the base plate and the concrete layer. The waterproof component includes a prestressed anchor plate, a self-locking nut, a waterproof mesh, and an expansion rubber ring. The self-locking nut, the waterproof mesh, and the expansion rubber ring are all sleeved on the outer surface of the prestressed reinforcement. The prestressed anchor plate has a central hole and is installed on the upper surface of the concrete layer. The upper surface of the prestressed anchor plate and the upper surface of the concrete layer are horizontally arranged.

[0009] Preferably, the self-locking nut is installed in the central hole of the prestressed anchor plate; the waterproof mesh is installed on the upper surface of the prestressed anchor plate, and the expansion rubber ring is installed above the waterproof mesh.

[0010] Preferably, the anchoring assembly is installed inside the base plate. The anchoring assembly includes a fastener, an anchor plate, a prestressed spring, and a bent-up bar. The fastener, anchor plate, and prestressed spring are all sleeved on the outer surface of the prestressed bar. The fastener is installed on the top of the prestressed bar, the anchor plate is installed at the bottom of the fastener, and the prestressed spring is installed at the bottom of the anchor plate. The bent-up bar has a U-shaped structure, the top of the bent-up bar is installed on the main reinforcement of the base plate, and the bottom of the bent-up bar passes through the prestressed spring.

[0011] According to the specific embodiments provided by this utility model, the following technical effects are disclosed: (1) The prestressed steel bars of this utility model penetrate the bottom slab, concrete layer and soil layer, and form a complete force system with the upper and lower fixing components and anchoring components, effectively transmitting the anti-buoyancy pressure. The prestressed springs and bent steel bars in the anchoring components can work together to disperse the top stress and avoid local stress concentration. Under the dual action, the anti-buoyancy bearing capacity of the device is greatly improved.

[0012] (2) The conical guide cap of the fixing component in this utility model can help the anchor rod be implanted into the soil layer. The combination of the anchor and the metal bearing can firmly fix the prestressed steel bar and ensure accurate installation positioning. At the same time, the grouting hole of the positioning frame can fully fill the gap between the heat shrink tube and the hole wall, further enhancing the bonding strength between the anchor rod and the soil layer and concrete layer, and effectively preventing displacement.

[0013] (3) The waterproof component of this utility model effectively blocks groundwater from seeping through the gap between the anchor rod and the base plate and the concrete layer by the cooperation of the prestressed anchor plate, waterproof net and expansion rubber ring. In addition, the horizontal fit design of the self-locking nut and the prestressed anchor plate further seals the gap, avoids water erosion of the internal structure, and fully protects the waterproof effect of the base plate and the concrete layer.

[0014] (4) The isolation sleeve and heat shrink tubing outside the prestressed steel bars of this utility model form a double protection, which can reduce the damage to the steel bars caused by soil corrosion and water erosion. The connection design between the main reinforcement of the bottom plate and the bent steel bars makes the integrity of the bottom plate and the anchor rod stronger and improves the deformation resistance of the device. Both of them together ensure the stability of the device in long-term use and extend its service life.

[0015] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the overall structure of an embodiment of a pressure-type threaded steel bar prestressed anti-buoyancy anchor bolt device of this utility model; Figure 2 This is a schematic diagram of the prestressed steel pipe structure of an embodiment of a pressure-type threaded steel bar prestressed anti-buoyancy anchor bolt device of this utility model; Figure 3 This is a schematic diagram of the positioning frame structure of an embodiment of a pressure-type threaded steel bar prestressed anti-buoyancy anchor bolt device of this utility model; Figure 4 yes Figure 1 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the top overall structure of an embodiment of a pressure-type threaded steel bar prestressed anti-buoyancy anchor bolt device of this utility model; Figure 6 This is a schematic diagram of the installation of prestressed steel bar structure in an embodiment of a pressure-type threaded steel bar prestressed anti-buoyancy anchor bolt device of this utility model; Figure 7 yes Figure 6 A top-down view; Figure 8 This is a schematic diagram of the installation and waterproofing components of an embodiment of a pressure-type threaded steel bar prestressed anti-buoyancy anchor bolt device according to this utility model; Figure 9 yes Figure 8 A top-down view; Figure 10 This is a schematic diagram of the installation and anchoring component structure of an embodiment of a pressure-type threaded steel bar prestressed anti-buoyancy anchor bolt device of this utility model; Figure 11 yes Figure 10 A top-view structural diagram; Figure 12 This is a construction flowchart of an embodiment of a pressure-type threaded steel bar prestressed anti-buoyancy anchor bolt device of this utility model.

[0017] Figure Labels 1. Conical guide cap; 2. Anchor; 3. Metal bearing body; 4. Hole wall; 5. Isolation sleeve; 6. Positioning frame; 61. Grouting hole; 7. Grout; 8. Heat shrink tubing; 9. Prestressed steel reinforcement; 10. Concrete layer; 11. Main reinforcement of bottom slab; 12. Bent-up reinforcement; 13. Bottom slab; 14. Fixture; 15. Anchor plate; 16. Prestressed spring; 17. Prestressed anchor plate; 18. Self-locking nut; 19. Waterproof mesh; 20. Expansion rubber ring. Detailed Implementation

[0018] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0019] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0020] Example 1 like Figure 1 As shown, this utility model provides a pressure-type threaded steel bar prestressed anti-buoyancy anchor device, including a soil layer, a concrete layer 10, prestressed steel bars 9, a base plate 13, a fixing component, a waterproof component, and an anchoring component. An installation pit is opened in the soil layer, the concrete layer 10 is placed on the upper surface of the installation pit, and the base plate 13 is installed around the installation pit; the prestressed steel bars 9 penetrate the concrete layer 10 and are installed in the soil layer; the fixing component is installed at the bottom of the prestressed steel bars 9; the anchoring component is installed at the top of the prestressed steel bars 9; and the waterproof component is installed at the bottom of the anchoring component.

[0021] The prestressed steel bar 9 is installed in the soil layer using a fixing assembly, which includes a conical guide cap 1, an anchor 2, and a metal support body 3. The conical guide cap 1 is installed at the bottom of the metal support body 3, the anchor 2 is installed inside the metal support body 3, and the prestressed steel bar 9 is installed inside the anchor 2 of the metal support body 3. The conical guide cap 1 facilitates the insertion of the prestressed steel bar 9 into the soil layer, while the combination of the anchor 2 and the metal support body 3 works in conjunction with fixing the prestressed steel bar 9 to ensure accurate installation.

[0022] like Figure 2As shown, an isolation sleeve 5 is fitted over the outer surface of the prestressed steel bar 9, a heat shrink tubing 8 is fitted over the outer surface of the isolation sleeve 5, and a positioning bracket 6 is also fitted over the isolation sleeve 5, as shown. Figure 3 As shown, the positioning frame 6 has a grouting hole 61, and grout 7 is injected between the heat shrink tube 8 and the hole wall 4. The grout 7 fully fills the space between the heat shrink tube 8 and the hole wall 4 through the grouting hole 61, enhancing the bonding strength between the prestressed steel bar 9 and the concrete layer 10 on the soil layer and preventing displacement.

[0023] The prestressed steel bar 9 is protected by a double layer of isolation sleeve 5 and heat shrink tubing 8, which reduces the damage to the prestressed steel bar 9 caused by soil and moisture and extends its service life.

[0024] First, grout 7 is injected between the heat shrink tube 8 and the hole wall 4. The heat shrink tube 8 shrinks when heated, better wrapping the isolation sleeve 5. Finally, a concrete layer 10 is poured onto the soil layer. The secondary grouting technology is used in conjunction with the support of prestressed steel bars 9 to improve the bond strength between the anchoring section and the soil layer. The characteristic value of the pull-out bearing capacity of a single anchor rod can reach the design requirements, further improving the anchoring force.

[0025] like Figure 4 As shown, the inner side of the base plate 13 is provided with the main reinforcement 11, and a waterproof component is provided between the main reinforcement 11 and the concrete layer 10. The waterproof component includes a prestressed anchor plate 17, a self-locking nut 18, a waterproof mesh 19, and an expansion rubber ring 20. The self-locking nut 18, the waterproof mesh 19, and the expansion rubber ring 20 are all sleeved on the outer surface of the prestressed steel bar 9. The prestressed anchor plate 17 has a central hole and is installed on the upper surface of the concrete layer 10. The upper surface of the prestressed anchor plate 17 and the upper surface of the concrete layer 10 are horizontally arranged.

[0026] The self-locking nut 18 is installed in the center hole of the prestressed anchor plate 17; the waterproof mesh 19 is installed on the upper surface of the prestressed anchor plate 17, and an expansion rubber ring 20 is installed above the waterproof mesh 19. The prestressed anchor plate 17, the waterproof mesh 19, and the expansion rubber ring 20 work together to effectively block groundwater from seeping through the gaps between the anchor rod and the base plate 13 and the concrete layer 10. In addition, the horizontal fit design of the self-locking nut 18 and the prestressed anchor plate 17 further seals the gaps, preventing water from corroding the internal structure and fully ensuring the waterproof effect of the base plate 13 and the concrete layer 10.

[0027] like Figure 5As shown, the anchoring assembly is installed inside the base plate 13. The anchoring assembly includes a fastener 14, an anchor plate 15, a prestressed spring 16, and a bent-up bar 12. The fastener 14, anchor plate 15, and prestressed spring 16 are all sleeved on the outer surface of the prestressed bar 9. The fastener 14 is installed on the top of the prestressed bar 9, and the anchor plate 15 is installed at the bottom of the fastener 14. The prestressed spring 16 is installed at the bottom of the anchor plate 15. The bent-up bar 12 has a U-shaped structure. The top of the bent-up bar 12 is installed on the main reinforcement 11 of the base plate, and the bottom of the bent-up bar 12 passes through the prestressed spring 16. Through the synergistic effect of the prestressed spring 16 and the bent-up bar 12, the top stress is dispersed, avoiding local stress concentration and further improving the anti-buoyancy bearing capacity.

[0028] like Figures 6-12 As shown, during use, first, the location is measured and positioned according to the implementation site to find the installation pit. The loose soil in the installation pit is cleared, and after clearing, the base plate 13 is installed around the pit. Then, a hole is drilled in the installation pit. Isolation sleeves 5 and heat shrink tubing 8 are sequentially fitted onto the outer surface of the prestressed steel bars 9, and positioning frames 6 are evenly fitted onto the outside of the isolation sleeves 5. After the prestressed steel bars 9 are installed in the designated position through the conical guide caps 1 of the fixing components, grout 7 is poured into the hole. After the grout 7 cools, the loose grout is cleared, and after leveling, the waterproof components and anchoring components are installed sequentially. Prestress can be applied to the prestressed steel bars 9 using a jack and torque wrench. After successful installation, several main reinforcement bars 11 of the base plate are installed in the installation pit. The bottom of the bent steel bars 12 passes through the prestressed spring 16, and the top is mechanically connected to the main reinforcement bars 11 of the base plate. Finally, the entire concrete layer 10 is poured to complete the construction.

[0029] Therefore, this utility model adopts the above-mentioned pressure-type threaded steel bar prestressed anti-buoyancy anchor device, which effectively prevents problems such as foundation heave and bottom plate deformation by applying prestress to balance the buoyancy of groundwater, thus ensuring the safety of underground space structures.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A pressure-type prestressed anti-buoyancy anchor bolt device for threaded steel bars, characterized in that: The system includes a soil layer, a concrete layer, prestressed steel bars, a base slab, fixing components, waterproofing components, and anchoring components. An installation pit is formed in the soil layer. The concrete layer is disposed on the upper surface of the installation pit, and the base slab is installed around the perimeter of the installation pit. The prestressed steel bars penetrate the concrete layer and are installed within the soil layer. The fixing components are installed at the bottom of the prestressed steel bars. The anchoring components are installed at the top of the prestressed steel bars. The waterproofing components are installed at the bottom of the anchoring components.

2. The pressure-type threaded steel bar prestressed anti-buoyancy anchor device according to claim 1, characterized in that: The prestressed steel bars are installed in the soil layer by the fixing assembly, which includes a conical guide cap, an anchor, and a metal bearing body. The conical guide cap is installed at the bottom of the metal bearing body, the anchor is installed inside the metal bearing body, and the prestressed steel bars are installed inside the anchor of the metal bearing body.

3. The pressure-type threaded steel bar prestressed anti-buoyancy anchor device according to claim 2, characterized in that: An isolation sleeve is fitted on the outer surface of the prestressed steel bar, a heat shrink tube is fitted on the outer surface of the isolation sleeve, a positioning frame is fitted on the outside of the isolation sleeve, and a grouting hole is opened on the positioning frame. Grout is injected between the heat shrink tube and the hole wall.

4. A pressure-type prestressed anti-buoyancy anchor device for threaded steel bars according to claim 3, characterized in that: The inner side of the base plate is provided with the main reinforcement of the base plate, and a waterproof component is provided between the main reinforcement of the base plate and the concrete layer. The waterproof component includes a prestressed anchor plate, a self-locking nut, a waterproof mesh and an expansion rubber ring. The self-locking nut, the waterproof mesh and the expansion rubber ring are all sleeved on the outer surface of the prestressed steel bar. The prestressed anchor plate has a central hole and is installed on the upper surface of the concrete layer. The upper surface of the prestressed anchor plate and the upper surface of the concrete layer are horizontally arranged.

5. A pressure-type prestressed anti-buoyancy anchor device for threaded steel bars according to claim 4, characterized in that: The self-locking nut is installed in the center hole of the prestressed anchor plate; the waterproof mesh is installed on the upper surface of the prestressed anchor plate, and the expansion rubber ring is installed above the waterproof mesh.

6. A pressure-type prestressed anti-buoyancy anchor device for threaded steel bars according to claim 5, characterized in that: The anchoring assembly is installed inside the base plate. The anchoring assembly includes a fastener, an anchor plate, a prestressed spring, and a bent-up bar. The fastener, anchor plate, and prestressed spring are all sleeved on the outer surface of the prestressed bar. The fastener is installed on the top of the prestressed bar, the anchor plate is installed at the bottom of the fastener, and the prestressed spring is installed at the bottom of the anchor plate.

7. A pressure-type prestressed anti-buoyancy anchor device for threaded steel bars according to claim 6, characterized in that: The bent-up reinforcing bar has a U-shaped structure, with its top installed on the main reinforcing bar of the base plate, and its bottom passing through the prestressed spring.

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