A connection structure system of anti-floating anchor rod and foundation bottom plate

Abstract

The utility model discloses a kind of connecting structure system of anti-floating anchor rod and foundation bottom plate, including foundation bottom plate, foundation cushion, anchor rod core, shear bending rib, anchor head steel plate, expansion waterstop, stress dispersion steel plate, sealing paste.The foundation bottom plate is cast-in-place reinforced concrete slab;The foundation cushion is cast-in-place plain concrete thin plate;The anchor rod core is PSB prestressed high-strength steel;The shear bending rib is the anchor head two ends bending U-shaped steel bar arranged in foundation bottom plate;The anchor head steel plate is steel hollow plate, is sleeved on axial PSB prestressed high-strength steel and is fixed together by upper and lower two limiting high-strength bolt connection;The expansion waterstop is set on limiting high-strength bolt;The stress dispersion steel plate is set on foundation cushion;The sealing paste is set in stress dispersion steel plate below.The utility model has the advantages of good corrosion resistance, high anti-permeability, fast construction speed, energy saving and environmental protection, and its technical and economic benefits are outstanding.

Description

Technical Field

[0001] This utility model relates to the fields of anti-buoyancy of building, municipal, and water conservancy foundations or anti-pull-out fixing of wind power and solar energy supports, and in particular to a connection structure system technology for anti-buoyancy anchors and foundation plates. Background Technology

[0002] Anti-buoyancy anchors and anti-uplift anchors are important measures for preventing buoyancy in underground structures and resisting uplift in foundations of building engineering. Anti-buoyancy anchors differ from ordinary foundation piles, possessing unique properties. The biggest difference lies in the fact that foundation uplift piles have large cross-sectional dimensions, high single pile bearing capacity, large pile hole diameter, are easy to pour concrete for, simple to construct, and easy to ensure quality. In contrast, anti-buoyancy or anti-uplift anchors bear uplift loads, but their cross-sectional dimensions are small, making construction more difficult and requiring higher quality control. Therefore, the structure of anti-buoyancy or anti-uplift anchors is complex, with weaknesses in aspects such as connection to the foundation and waterproofing. The design and construction process must be meticulously implemented; otherwise, it will be difficult to meet engineering requirements.

[0003] Prior to this invention, a Chinese patent (application number 2020226535530) disclosed a connection mechanism between a prestressed anti-buoyancy anchor and infrastructure, comprising an anti-buoyancy anchor and a fixing sleeve. By setting a baffle on the anti-buoyancy anchor and forming a fixing sleeve, the connection strength between the anti-buoyancy anchor and the infrastructure body is improved, and the connectivity between the two is increased. Although this invention achieves the purpose of strengthening the connection between the anchor and the foundation, it still has the following shortcomings: (1) The positioning and connection of the fixing sleeve are difficult; (2) It only strengthens the connection between the anchor and the foundation but cannot effectively solve the problem of water leakage and seepage between the anchor and the foundation.

[0004] Prior to this invention, a Chinese patent (application number 2023107135742) disclosed a connection device and construction method between a transmission line tower and an anchor foundation, including an end plate, a miniature shear-resistant steel pipe, an anchor, end plate bolts, a steel frame, and anchor bolts. Although this invention ensures the stability of the connection between the tower and the anchor foundation and fully utilizes the shear resistance of the miniature shear-resistant steel pipe, it still has the following shortcomings: (1) The scope of application of this invention is only for transmission line towers, and it is not applicable to the anti-buoyancy of underground building structures; (2) It only solves the stability of the connection between the anchor and the foundation, but does not solve the problem of waterproofing the gap between the anchor and the foundation.

[0005] Improving the stability of the connection between anti-buoyancy anchors and the foundation, facilitating construction, and simultaneously addressing the waterproofing of the joint between the anti-buoyancy anchor and the foundation have become urgent issues in the engineering field. Therefore, to address the shortcomings of existing anti-buoyancy anchor technologies, a connection structure system technology between anti-buoyancy anchors and the foundation slab is proposed, ensuring project safety, saving costs, and shortening the construction period. Summary of the Invention

[0006] To address the aforementioned shortcomings of existing technologies, this utility model proposes a connection structure system between an anti-buoyancy anchor and a foundation plate.

[0007] The technical solution of this utility model is achieved as follows: a connection structure system between an anti-buoyancy anchor and a foundation slab, characterized in that it includes a foundation slab, a foundation pad, PSB prestressed high-strength steel bars (anchor core), shear bending reinforcing bars, an anchor head steel plate, an expansion waterstop strip, a stress diffusion steel plate, and sealant.

[0008] The connection structure system between the anti-buoyancy anchor and the foundation plate is characterized in that: the foundation plate is a cast-in-place reinforced concrete slab with a thickness of not less than 350mm and a concrete grade of not less than C30.

[0009] The connection structure system between the anti-buoyancy anchor and the foundation slab is characterized in that: the foundation pad is a cast-in-place plain concrete thin slab with a thickness of not less than 100mm and a concrete grade of not less than C20.

[0010] The connection structure system between the anti-buoyancy anchor and the foundation plate is characterized in that: the anchor core is a PSB prestressed high-strength steel bar with a strength of not less than PSB960 and a diameter of not less than 25mm, and prestress has been applied.

[0011] The connection structure system between the anti-buoyancy anchor and the foundation slab is characterized in that: the anti-shear bending reinforcement is a U-shaped reinforcement bent at both ends of the anchor head in the foundation slab, and each anchor has no less than 2 anti-shear bending reinforcements with a diameter of not less than 20mm.

[0012] The connection structure system between the anti-buoyancy anchor and the foundation plate is characterized in that: the anchor head steel plate is a hollow steel plate with a diameter or side length of not less than 100mm and a thickness of not less than 20mm, which is sleeved on the axial PSB prestressed high-strength steel bar and fixed together by two upper and lower limiting high-strength bolts.

[0013] The connection structure system between the anti-buoyancy anchor and the foundation plate is characterized in that: the high-strength bolts serve as limiting bolts and are respectively installed on the upper and lower parts of the anchor head steel plate;

[0014] The connection structure system between the anti-buoyancy anchor and the foundation plate is characterized in that: the expansion waterstop strip is set on the high-strength bolt to prevent water seepage from the side of the PSB prestressed high-strength steel bar, and its specifications and dimensions are determined according to the engineering design;

[0015] The connection structure system between the anti-buoyancy anchor and the foundation plate is characterized in that: the stress diffusion steel plate is set on the foundation pad layer, which plays the role of diffusing the vertical tensile force of the anti-buoyancy anchor, and its size is determined by design calculation;

[0016] The connection structure system between the anti-buoyancy anchor and the foundation plate is characterized in that: the sealant is placed under the stress diffusion steel plate to seal the gap between the PSB prestressed high-strength steel (anchor core) and the grouting body.

[0017] This utility model has the following beneficial effects:

[0018] In this invention, the anti-buoyancy anchor is connected to the foundation slab as a whole, forming an anchor system that withstands pull-out forces after concrete pouring. The anchor head steel plate and prestressed diffusion steel plate at the top of the anchor effectively diffuse the concentrated tensile force of the anchor core, reducing the shear effect on the foundation slab caused by buoyancy. Furthermore, the shear stress on the foundation slab is further reduced by the shear reinforcement within the foundation slab, thus allowing for a reduction in the thickness and amount of concrete used. The use of expansion sealing strips and sealant at the contact surface between the anchor core and the foundation slab concrete creates a sealed waterproofing system, compensating for water seepage and leakage caused by long-term exposure to groundwater. This invention not only increases the stability of the single anchor load and reduces the amount of anchor used, but also effectively reduces the risk of water seepage at the anchor head contact surface. Attached Figure Description

[0019] To more clearly illustrate the embodiments of this utility model, the specific implementation methods of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the embodiment;

[0021] Figure 2 This is a schematic diagram of the anchor head in an embodiment;

[0022] Figure 3 This is a schematic diagram of the cross-section of the anchor bolt in an embodiment;

[0023] In the diagram: 1. Grouting body; 2. Anchor rod core; 3. Foundation base plate; 4. Foundation cushion layer; 5. Foundation reinforcement; 6. High-strength bolt; 7. Steel plate; 8. Shear bending reinforcement; 9. Expansion waterstop strip; 10. Sealant. Detailed Implementation

[0024] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] This implementation example Figures 1-3 As shown, a structure for connecting an anti-buoyancy anchor rod to a foundation slab mainly includes a grouting body (1); a PSB prestressed high-strength steel anchor rod core (2); a foundation slab (3); a foundation pad (4); foundation steel bars (5); high-strength bolts (6); a steel plate (7); shear bending reinforcing bars (8); an expansion waterstop strip (9); and sealant (10).

[0026] like Figures 1-3 As shown, the main technical measure for the connection system between the anti-buoyancy anchor and the foundation slab is to drill a hole in the soil and rock using anchor drilling machinery. After the hole is formed, the anchor core (2) with a PVC pipe (202) and the grouting pipe (101) are lowered. The anchor core is a prestressed high-strength steel bar with a strength of not less than PSB960 and a diameter of not less than 25mm, and spiral steel bars (201) are installed within 2.0m of the top of the anchor. After the anchor core is lowered, the grouting body (1) is constructed. The grouting body material can be pure cement slurry or cement mortar, but the strength should not be less than C30. After the grouting is completed, anti-corrosion grease is injected between the anchor core and the PVC pipe.

[0027] like Figures 1-3 As shown, after the anchor bolt hole drilling and grouting construction are completed, the grouting body reaches the strength required by the design and passes the test, the foundation cushion layer (4) is constructed. The foundation cushion layer is a plain concrete thin plate with a thickness of not less than 100mm and a concrete grade of not less than C20.

[0028] like Figures 1-3 As shown, after the foundation pad layer construction is completed, sealant (10) is applied to the contact surface between the anchor core and the foundation pad layer. Simultaneously, a stress-diffusing steel plate (602) is installed on the top surface of the foundation pad layer. The stress-diffusing steel plate is a hollow disc with a diameter of not less than 100 mm and a thickness of not less than 10 mm. The steel material can be Q235B according to the design. After the stress-diffusing steel plate is installed, it is fixed to the anchor core with high-strength bolts (703). Next, a hollow steel anchor plate (601) with a diameter or side length of not less than 100 mm and a thickness of not less than 20 mm is installed on top of the anchor core. This plate is fitted onto the anchor core and fixed together by upper high-strength bolts (701) and lower high-strength bolts (702). Then, an expansion waterstop strip (9) is installed on top of the high-strength bolts.

[0029] like Figures 1-3 As shown, after the expansion waterstop strip construction is completed, the foundation slab reinforcement (5) and at least two shear bending bars (8) with a diameter of not less than 20mm are tied together. At the same time, the foundation slab reinforcement and the shear bending bars are tied together. After the foundation slab reinforcement is tied, the foundation slab (3) concrete pouring construction is carried out, and the foundation slab concrete is cured according to the design requirements.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A connection structure system between an anti-buoyancy anchor and a foundation slab, characterized in that: This includes the foundation slab, foundation pad, anchor bolt core, shear bending reinforcement, anchor head steel plate, expansion waterstop strip, stress diffusion steel plate, and sealant. The shear-resistant bending reinforcement is a U-shaped bar bent at both ends of the anchor head in the foundation slab, and each anchor has no less than 2 shear-resistant bending reinforcements with a diameter of no less than 20mm. The anchor head steel plate is a hollow steel plate with a diameter or side length of not less than 100mm and a thickness of not less than 20mm. It is sleeved on the axial PSB prestressed high-strength steel bar and fixed together by two upper and lower limiting high-strength bolts. The high-strength bolts serve as limiting devices and are respectively installed on the upper and lower parts of the anchor head steel plate; The expansion waterstop strip is installed on the high-strength bolt to prevent water seepage from the side of the anchor core. Its specifications and dimensions are determined according to the engineering design. The stress diffusion steel plate is placed on the foundation pad layer and serves to diffuse the vertical tensile force of the anti-buoyancy anchor. Its size is determined by design calculation. The sealant is placed under the stress diffusion steel plate to seal the gap between the anchor rod core and the grouting body.

2. The connection structure system between the anti-buoyancy anchor and the foundation plate according to claim 1, characterized in that: The foundation slab is a cast-in-place reinforced concrete slab with a thickness of not less than 350mm and a concrete grade of not less than C30.

3. The connection structure system between the anti-buoyancy anchor and the foundation plate according to claim 1, characterized in that: The foundation pad is a cast-in-place plain concrete slab with a thickness of not less than 100mm and a concrete grade of not less than C20.

4. The connection structure system between the anti-buoyancy anchor and the foundation plate according to claim 1, characterized in that: The anchor rod core is made of PSB prestressed high-strength steel bar with a strength of not less than PSB960 and a diameter of not less than 25mm, and prestress has been applied.

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