Flexible connection node structure of reinforced concrete anti-floating pile and foundation slab

Abstract

The utility model discloses a flexible connection node structure of a reinforced concrete anti-floating pile and a foundation slab, belongs to the technical field of building foundations, and aims to solve the problem that deformation and instability are easily caused when an existing anti-floating pile and a foundation slab are directly and rigidly connected at a low underground water level. The flexible connection node structure comprises a concrete foundation bottom plate (2), a rubber pad (9) and a reinforced concrete anti-floating pile (1) which are sequentially connected from top to bottom, the reinforced concrete anti-floating pile (1) comprises a longitudinal bar (3) and a concrete pile body (10), the upper end of the longitudinal bar (3) is located in the concrete foundation bottom plate (2), the longitudinal bar (3) penetrates through the rubber pad (9), the thickness of the rubber pad (9) is 50-100 mm, and the thickness of the concrete pile body (10) is 50-100 mm. And the lower parts of the longitudinal bars (3) are positioned in the concrete pile body (10). Through flexible connection of the rubber pads, the uplift bearing capacity and rigidity can be improved, the compression bearing capacity does not need to be considered, and the defects of an existing rigid connection method are overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of building foundations, in particular to a flexible connection node structure of a reinforced concrete anti-floating pile and a foundation bottom plate. Background Art

[0002] In the construction of the connection node between the traditional anti-floating pile and the foundation slab, the pile foundation and the foundation slab are usually directly rigidly connected. For example, the Chinese utility model patent CN218175932U, published on December 30, 2022, discloses a connection method between the pressure-type anti-floating pile body and the foundation in the "Top locking anchor device for a pressure-type anti-floating pile". The problem with the existing direct rigid connection between the anti-floating pile and the foundation slab is that when the groundwater level is low, the foundation slab will be under pressure. At this time, the pile foundation needs to bear most of the vertical load, and the reaction force at the bottom of the pile may also cause a large bending moment in the foundation slab, resulting in deformation and instability, causing safety problems. Utility Model Content

[0003] In order to solve the problem that the direct rigid connection between the above-mentioned anti-floating piles and the foundation bottom plate is prone to deformation and instability when the groundwater level is low, the utility model provides a flexible connection node structure between reinforced concrete anti-floating piles and the foundation bottom plate, in which the anti-floating piles and the foundation bottom plate are flexibly connected through rubber pads, which can improve the pull-out bearing capacity and rigidity without considering the compressive bearing capacity, thereby eliminating the drawbacks of the existing rigid connection method.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] A flexible connection node structure of a reinforced concrete anti-floating pile and a foundation slab comprises a concrete foundation slab, a rubber pad and a reinforced concrete anti-floating pile connected in sequence from top to bottom. The reinforced concrete anti-floating pile comprises longitudinal reinforcement and a concrete pile body. The upper end of the longitudinal reinforcement is located in the concrete foundation slab, the longitudinal reinforcement passes through the rubber pad, the thickness of the rubber pad is 50 mm to 100 mm, and the lower part of the longitudinal reinforcement is located in the concrete pile body.

[0006] The concrete pile body is in an upright state, a plurality of longitudinal reinforcements are arranged at intervals along the circumference of the concrete pile body, the axis of the rubber pad coincides with the axis of the concrete pile body, and the outer diameter of the rubber pad is greater than or equal to the outer diameter of the concrete pile body.

[0007] The flexible connection node structure between the reinforced concrete anti-floating pile and the foundation bottom plate also includes a steel outer sleeve, which is sleeved outside the longitudinal reinforcement, and there is a gap between the steel outer sleeve and the longitudinal reinforcement.

[0008] The upper end of the steel bar outer sleeve is located in the concrete foundation bottom plate, the lower end of the steel bar outer sleeve is located in the concrete pile body, a first through hole is arranged on the rubber pad, and the steel bar outer sleeve passes through the first through hole of the rubber pad.

[0009] The outer sleeve of the steel bar is in an upright state. The material of the outer sleeve of the steel bar is PVC. The gap between the outer sleeve of the steel bar and the longitudinal reinforcement is 5mm-10mm.

[0010] A circular steel plate is arranged in the upper part of the concrete pile body, a plurality of second through holes are arranged on the circular steel plate, and the longitudinal reinforcements pass through the second through holes of the circular steel plate one by one.

[0011] The annular steel plate is in a horizontal state, the steel bar outer sleeve and the annular steel plate are arranged up and down, the lower end of the steel bar outer sleeve abuts against the annular steel plate, and there is no rigid connection between the steel bar outer sleeve and the annular steel plate.

[0012] Stirrups are arranged in the concrete pile body, the stirrups are welded to the circular steel plate, the stirrups are connected and fixed to the longitudinal reinforcement, a part of the stirrups is located above the circular steel plate, and the other part of the stirrups is located below the circular steel plate.

[0013] The flexible connection node structure between the reinforced concrete anti-floating pile and the foundation slab also includes a waterproof layer and a plain concrete cushion layer. The concrete foundation slab, the waterproof layer and the plain concrete cushion layer are stacked in sequence from top to bottom, and the waterproof layer and the plain concrete cushion layer are both sleeved on the outside of the rubber pad.

[0014] The lower surface of the plain concrete cushion layer is flush with the upper end surface of the concrete pile body, and the waterproof layer and the plain concrete cushion layer are both in contact with the rubber pad.

[0015] The beneficial effects of the utility model are:

[0016] 1. A rubber pad is laid between the anti-floating pile and the foundation slab. In actual use, due to the small vertical stiffness of the rubber pad, when the groundwater level is low, it can buffer the pressure transmitted from the foundation slab, effectively avoiding the anti-floating pile from being compressed, so that the anti-floating pile only provides pull-out bearing capacity and stiffness without considering the compressive bearing capacity, thereby improving the safety of the building structure; at the same time, when the groundwater level is high, this node structure can effectively transfer the pull-out bearing capacity between the anti-floating pile and the foundation slab, meeting the anti-floating requirements of the structure.

[0017] 2. The circular steel plate and the longitudinal reinforcement are connected by welding, and the weld accuracy and quality are easier to control, and the construction quality can be guaranteed.

[0018] 3. Put a PVC pipe on the outside of the longitudinal reinforcement. When the anti-floating pile body is under pressure, the longitudinal reinforcement can be deformed, effectively releasing the pressure from the upper part and avoiding safety hazards caused by the inconsistency between the analysis model and the actual model.

[0019] 4. The flexible connection design between the reinforced concrete anti-floating pile and the foundation slab is safe and reliable, with clear force transmission, simple construction, and practical feasibility, having good social and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0021] Figure 1 is the front view schematic diagram of the flexible connection node structure between the reinforced concrete anti-floating pile and the foundation slab of the present utility model.

[0022] Figure 2 is Figure 1 the schematic diagram of the rubber pad part in

[0023] Figure 3 is the top view schematic diagram of the circular steel plate.

[0024] Figure 4 is the top view schematic diagram of the rubber pad.

[0025] 1. Reinforced concrete anti-floating pile; 2. Concrete foundation slab; 3. Longitudinal reinforcement; 4. Stirrup; 5. Steel pipe casing for reinforcement; 6. Circular steel plate; 7. Plain concrete cushion; 8. Waterproof layer; 9. Rubber pad; 10. Concrete pile body;

[0026] 601. Second through hole;

[0027] 901. First through hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0029] For the convenience of understanding and description, the following description of the present utility model adopts absolute position relationships. Without special explanation, the orientation word "upper" represents Figure 1 the upper side direction in Figure 1 the orientation word "lower" represents Figure 1 the lower side direction in Figure 1 the orientation word "left" represents Figure 1 the left side direction in Figure 1The paper surface and points to the direction outside the paper surface. The utility model adopts the observation perspective of the reader or user to describe, but the above-mentioned directional words cannot be understood or interpreted as limiting the protection scope of the utility model. Regarding the parameters such as the size of the components, those skilled in the art can determine them specifically according to actual needs.

[0030] like Figure 1 to Figure 2 As shown, a flexible connection node structure of a reinforced concrete anti-floating pile and a foundation slab described in an embodiment of the utility model comprises a concrete foundation slab 2, a rubber pad 9 and a reinforced concrete anti-floating pile 1 connected in sequence from top to bottom, the reinforced concrete anti-floating pile 1 contains longitudinal reinforcement 3 and a concrete pile body 10, the upper end of the longitudinal reinforcement 3 is located in the concrete foundation slab 2, the longitudinal reinforcement 3 passes through the rubber pad 9, the thickness of the rubber pad 9 is 50 mm to 100 mm, and the lower part of the longitudinal reinforcement 3 is located in the concrete pile body 10.

[0031] In the utility model, the reinforced concrete anti-floating pile 1 and the concrete foundation bottom plate 2 are flexibly connected by a rubber pad 9, the purpose of which is to effectively solve the anti-floating problem of the building foundation, avoid the situation where the anti-floating pile under low water level is over-pressed and causes instability, and improve the safety performance of the pile foundation. During the pile foundation construction, the connection between the traditional anti-floating pile and the foundation bottom plate adopts a rigid connection. When the groundwater level is low, the anti-floating pile needs to bear the pressure of the upper structure transmitted from the foundation bottom plate. It is impossible to meet the design assumption that the designer only considers the anti-pullout of the anti-floating pile. This will produce the following contradiction: the anti-floating pile only meets the anti-floating needs, and its number is often small. Even in the case of meeting local anti-floating, only anti-floating piles can be set in this range. If the designer considers that the anti-floating pile also bears the role of compression, its number will increase greatly, and the economy will be affected; but if the designer does not consider the anti-floating pile to bear the role of compression, because the assumption does not match the actual situation, the actual stress state of the foundation bottom plate cannot match the calculation, its safety will be affected, and it may cause problems such as cracking and deformation of the bottom plate.

[0032] In the utility model, the concrete foundation bottom plate 2, the rubber pad 9 and the concrete pile body 10 are connected in sequence from top to bottom, the concrete pile body 10 and the concrete foundation bottom plate 2 are flexibly connected through the rubber pad 9, the rubber pad 9 can adopt the existing building shock-absorbing rubber pad, the reinforced concrete anti-floating pile 1 and the concrete foundation bottom plate 2 are flexibly connected through the rubber pad 9, which can provide pull-out bearing capacity and rigidity without considering the compressive bearing capacity, thereby eliminating the disadvantages of the existing rigid connection method.

[0033] The concrete pile body 10 is formed by pouring plain concrete. The concrete pile body 10 is in an upright state. A plurality of longitudinal bars 3 are arranged at intervals along the circumference of the concrete pile body 10. The rubber pad 9 and the concrete pile body 10 are both cylindrical structures. The axis of the rubber pad 9 coincides with the axis of the concrete pile body 10. The outer diameter of the rubber pad 9 is greater than or equal to the outer diameter of the concrete pile body 10. For example, the outer diameter of the rubber pad 9 is equal to the outer diameter of the concrete pile body 10.

[0034] like Figure 1 to Figure 2 As shown, the rubber pad 9 laid between the concrete pile body 10 and the concrete foundation bottom plate 2, in actual use, due to the small vertical stiffness of the rubber pad 9, when the groundwater level is low, it can buffer the pressure transmitted from the concrete foundation bottom plate 2, effectively avoiding the concrete pile body 10 from being compressed, so that the concrete pile body 10 only provides pull-out bearing capacity and stiffness without considering the compressive bearing capacity, thereby improving the safety of the building structure; at the same time, when the groundwater level is high, this node can effectively transfer the pull-out bearing capacity between the concrete pile body 10 and the concrete foundation bottom plate 2, meeting the anti-floating requirements of the structure.

[0035] like Figure 1 and Figure 4 As shown, the flexible connection node structure of the reinforced concrete anti-floating pile and the foundation slab also includes a steel outer sleeve 5, which is sleeved outside the longitudinal reinforcement 3 in a one-to-one correspondence, and there is a gap between the steel outer sleeve 5 and the longitudinal reinforcement 3. The upper end of the steel outer sleeve 5 is located in the concrete foundation slab 2, and the lower end of the steel outer sleeve 5 is located in the concrete pile body 10. The rubber pad 9 is provided with a plurality of first through holes 901, and the steel outer sleeve 5 passes through the first through holes 901 of the rubber pad 9 in a one-to-one correspondence.

[0036] The outer sleeve of the steel bar 5 is in an upright state, and the material of the outer sleeve of the steel bar 5 can be metal or plastic. For example, the material of the outer sleeve of the steel bar 5 can be PVC, that is, the outer sleeve of the steel bar 5 is a PVC hose. When the outer sleeve of the steel bar 5 passes through the first through hole 901 on the rubber pad 9, the outer sleeve of the steel bar 5 and the rubber pad 9 can be clearance-fitted. After the concrete foundation slab 2 is poured, the outer sleeve of the steel bar 5 and the rubber pad 9 can be interference-fitted. The gap between the outer sleeve of the steel bar 5 and the longitudinal reinforcement 3 can be 5mm-10mm. When the concrete pile body 10 is under pressure, the longitudinal reinforcement 3 can be deformed, which effectively releases the pressure from the upper part, avoiding safety hazards caused by the inconsistency between the analysis model and the actual model.

[0037] like Figure 1 and Figure 3As shown, a circular steel plate 6 is arranged in the upper part of the concrete pile body 10, the circular steel plate 6 is in a horizontal state, a plurality of second through holes 601 are arranged on the circular steel plate 6, the axis of the circular steel plate 6 coincides with the axis of the concrete pile body 10, the plurality of second through holes 601 are arranged at intervals along the circumference of the circular steel plate 6, and the longitudinal ribs 3 pass through the second through holes 601 of the circular steel plate 6 one by one.

[0038] The steel outer sleeve 5 is arranged above and below the annular steel plate 6, the steel outer sleeve 5 is seated on the annular steel plate 6, the outer diameter of the steel outer sleeve 5 is larger than the aperture of the second through hole 601, the lower end of the steel outer sleeve 5 abuts against the annular steel plate 6, and there is no rigid connection between the steel outer sleeve 5 and the annular steel plate 6. When the concrete pile body 10 is not poured, the steel outer sleeve 5 can be separated from the annular steel plate 6.

[0039] Stirrups 4 are arranged in the concrete pile body 10, that is, the reinforced concrete anti-floating pile 1 comprises longitudinal reinforcement 3, stirrups 4, annular steel plate 6 and concrete pile body 10. Stirrups 4 are welded to the annular steel plate 6, and the weld accuracy and quality are easier to control, so that the construction quality can be guaranteed. Stirrups 4 are connected and fixed to the longitudinal reinforcement 3, and a part of stirrups 4 is located above the annular steel plate 6, and another part of stirrups 4 is located below the annular steel plate 6.

[0040] like Figure 1 and Figure 2 As shown, the flexible connection node structure of the reinforced concrete anti-floating pile and the foundation bottom plate also includes a waterproof layer 8 and a plain concrete cushion layer 7. The concrete foundation bottom plate 2, the waterproof layer 8 and the plain concrete cushion layer 7 are stacked and connected in sequence from top to bottom, and the waterproof layer 8 and the plain concrete cushion layer 7 are both sleeved on the outside of the rubber pad 9. The lower surface of the plain concrete cushion layer 7 is flush with the upper end surface of the concrete pile body 10, and the waterproof layer 8 and the plain concrete cushion layer 7 are both in contact with the rubber pad 9.

[0041] The following describes a construction method for the flexible connection node structure between the reinforced concrete anti-floating pile and the foundation slab.

[0042] 1. The longitudinal reinforcement 3 and the lower stirrups 4 are assembled into a reinforcement cage according to the designed positioning.

[0043] 2. Install the annular steel plate 6 and the steel bar outer sleeve 5. The longitudinal reinforcement 3 passes through the second through hole 601 of the annular steel plate 6. The central through hole of the annular steel plate 6 can facilitate the pouring of the concrete pile body 10. The longitudinal reinforcement 3 passes through the steel bar outer sleeve 5. The annular steel plate 6 is welded and fixed to the lower stirrup 4 and the upper stirrup 4. During construction, there shall be no connection measures between the steel bar outer sleeve 5 and the longitudinal reinforcement 3, stirrup 4 and the annular steel plate 6. The steel bar outer sleeve 5 only naturally hangs on the annular steel plate 6.

[0044] 3. Place the assembled longitudinal reinforcement 3, stirrups 4, steel bar outer casing 5 and circular steel plate 6 into the holes drilled according to the designed positioning.

[0045] 4. Pour concrete to the elevation required by the design of the concrete pile body 10 to form the concrete pile body 10.

[0046] 5. Lay a plain concrete cushion layer 7 and a waterproof layer 8 at the pile top elevation of the concrete pile body 10 , install a rubber pad 9 above the concrete pile body 10 , and pass the longitudinal reinforcement 3 through the first through hole 901 of the rubber pad 9 .

[0047] 6. After all connection measures and components are completed as required, the concrete foundation slab 2 is poured.

[0048] The above is only a specific embodiment of the utility model, and it cannot be used to limit the scope of the utility model. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the protection scope of the utility model patent should still fall within the scope of this patent. In addition, the technical features of the utility model can be freely combined with each other, with technical features and technical solutions, and with technical solutions.

Claims

1. A flexible connection node structure between reinforced concrete anti-floating piles and foundation slabs, characterized in that: The flexible connection node structure of the reinforced concrete anti-floating pile and the foundation bottom plate comprises a concrete foundation bottom plate (2), a rubber pad (9) and a reinforced concrete anti-floating pile (1) connected in sequence from top to bottom, the reinforced concrete anti-floating pile (1) comprising longitudinal reinforcement (3) and a concrete pile body (10), the upper end of the longitudinal reinforcement (3) being located in the concrete foundation bottom plate (2), the longitudinal reinforcement (3) passing through the rubber pad (9), the thickness of the rubber pad (9) being 50 mm to 100 mm, and the lower part of the longitudinal reinforcement (3) being located in the concrete pile body (10).

2. The flexible connection node structure of the reinforced concrete anti-floating pile and the foundation bottom plate according to claim 1 is characterized in that: The concrete pile body (10) is in an upright state, a plurality of longitudinal bars (3) are arranged at intervals along the circumference of the concrete pile body (10), the axis of the rubber pad (9) coincides with the axis of the concrete pile body (10), and the outer diameter of the rubber pad (9) is greater than or equal to the outer diameter of the concrete pile body (10).

3. The flexible connection node structure of the reinforced concrete anti-floating pile and the foundation bottom plate according to claim 1 is characterized in that: The flexible connection node structure between the reinforced concrete anti-floating pile and the foundation bottom plate also includes a steel outer sleeve (5), which is sleeved outside the longitudinal reinforcement (3), and a gap exists between the steel outer sleeve (5) and the longitudinal reinforcement (3).

4. The flexible connection node structure of the reinforced concrete anti-floating pile and the foundation bottom plate according to claim 3 is characterized in that: The upper end of the steel bar outer sleeve (5) is located in the concrete foundation bottom plate (2), and the lower end of the steel bar outer sleeve (5) is located in the concrete pile body (10). The rubber pad (9) is provided with a first through hole (901), and the steel bar outer sleeve (5) passes through the first through hole (901) of the rubber pad (9).

5. The flexible connection node structure of the reinforced concrete anti-floating pile and the foundation bottom plate according to claim 4 is characterized in that: The outer sleeve of the steel bar (5) is in an upright state. The material of the outer sleeve of the steel bar (5) is PVC. The gap between the outer sleeve of the steel bar (5) and the longitudinal reinforcement (3) is 5mm-10mm.

6. The flexible connection node structure of the reinforced concrete anti-floating pile and the foundation bottom plate according to claim 5 is characterized in that: A circular steel plate (6) is arranged in the upper part of the concrete pile body (10), a plurality of second through holes (601) are arranged on the circular steel plate (6), and the longitudinal reinforcements (3) pass through the second through holes (601) of the circular steel plate (6) in a one-to-one correspondence.

7. The flexible connection node structure of the reinforced concrete anti-floating pile and the foundation bottom plate according to claim 6 is characterized in that: The annular steel plate (6) is in a horizontal state, the steel bar outer sleeve (5) and the annular steel plate (6) are arranged up and down, the lower end of the steel bar outer sleeve (5) abuts against the annular steel plate (6), and there is no rigid connection between the steel bar outer sleeve (5) and the annular steel plate (6).

8. The flexible connection node structure of the reinforced concrete anti-floating pile and the foundation bottom plate according to claim 6 is characterized in that: Stirrups (4) are arranged in the concrete pile body (10), the stirrups (4) are welded to the annular steel plate (6), the stirrups (4) are connected and fixed to the longitudinal reinforcement (3), a part of the stirrups (4) is located above the annular steel plate (6), and another part of the stirrups (4) is located below the annular steel plate (6).

9. The flexible connection node structure of the reinforced concrete anti-floating pile and the foundation bottom plate according to claim 1 is characterized in that: The flexible connection node structure between the reinforced concrete anti-floating pile and the foundation slab also includes a waterproof layer (8) and a plain concrete cushion layer (7); the concrete foundation slab (2), the waterproof layer (8) and the plain concrete cushion layer (7) are stacked in sequence from top to bottom; the waterproof layer (8) and the plain concrete cushion layer (7) are both sleeved on the outside of the rubber pad (9).

10. The flexible connection node structure of the reinforced concrete anti-floating pile and the foundation bottom plate according to claim 9 is characterized in that: The lower surface of the plain concrete cushion layer (7) is flush with the upper end surface of the concrete pile body (10), and the waterproof layer (8) and the plain concrete cushion layer (7) are both in contact with the rubber pad (9).

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