A structure for adjusting pile foundation stiffness

Abstract

The present application discloses a structure for adjusting the stiffness of a pile foundation, including a pile foundation body and pile foundation steel bars on the pile foundation body, the pile foundation steel bars passing upward through a cushion layer to the inside of a raft slab, the ends of the pile foundation steel bars being connected to supporting rods, the supporting rods being passed through an anchor plate, the upper ends of the supporting rods being engaged with the anchor plate, and the anchor plate being provided with an elastic buffer component acting on the raft slab. The beneficial effects of the present application are as follows: a protective sleeve is used to protect the pile foundation steel bars, a waterproof, insulating, corrosion-resistant, and permeability-resistant multi-layer protective structure is formed on the outside of the pile foundation steel bars to prevent cushion layers and soil from reducing the durability of the pile foundation steel bars; an elastic buffer component is formed at the ends of the pile foundation steel bars to achieve an elastic buffer transition between the pile foundation steel bars and the raft slab, so that the pile foundation can adjust its own stiffness according to different situations to meet the force requirements of the building.

Description

Technical Field

[0001] The present application belongs to the technical field of building pile foundations, and specifically relates to a structure for adjusting the stiffness of a pile foundation. Background Art

[0002] Conventional pile-raft foundation has direct rigid connection between piles and rafts, and its overall stiffness is determined by the stiffness of the raft plate and the supporting stiffness of the pile foundation. If the stiffness of the pile raft needs to be adjusted to meet the use requirements, the stiffness of the raft plate can be achieved by adjusting the thickness of the raft plate, but it is often expensive and costly; the supporting stiffness of the pile foundation can be adjusted by changing the pile length, pile diameter and pile spacing, but the arrangement of piles with different pile diameters and different pile lengths is greatly affected by the superstructure form and geological conditions, and the scope of application is greatly limited.

[0003] However, the existing pile end stiffness adjustment device has unstable operation and poor safety performance. After setting, its supporting stiffness cannot be actively intervened and adjusted according to needs. The control and adjustment are inflexible and inconvenient, the implementation is unreliable, the construction operation is cumbersome, the adjustment accuracy is low, and the degree of quantification is low. The effect of promoting the development and application of the active control theory of the whole process of pile raft foundation is not obvious. Utility Model Content

[0004] The purpose of the present application is to provide a structure for adjusting the stiffness of a pile foundation, thereby solving the problem of adjusting the stiffness of a pile foundation.

[0005] The purpose of this application is achieved through the following technical solutions:

[0006] A structure for adjusting the stiffness of a pile foundation comprises a pile foundation body and pile foundation steel bars on the pile foundation body, the pile foundation steel bars pass upward through a cushion layer into a raft slab, the ends of the pile foundation steel bars are connected to support rods, the support rods are passed through an anchor plate, the upper ends of the support rods are engaged with the anchor plate, and an elastic buffer component acting on the raft slab is provided on the anchor plate.

[0007] Furthermore, a secondary casting section is provided at the end of the pile foundation body, and the pile foundation reinforcement passes through the secondary casting section and the cushion layer in sequence upward to the raft slab.

[0008] Furthermore, a protective sleeve is provided on the pile foundation steel bar, a protective film is wrapped around the outside of the pile foundation steel bar, a protective coating is coated between the protective film and the pile foundation steel bar, and a protective filling layer is filled between the protective sleeve and the protective film.

[0009] Furthermore, the protective sleeve is a corrugated tube made of plastic or rubber, the protective film is made of plastic, the protective coating is a butter coating, and the protective filling layer is an epoxy resin filling layer.

[0010] Furthermore, the pile foundation reinforcement and the support rod are fixed by welding, or the pile foundation reinforcement and the support rod are fixed by sleeve connection.

[0011] Furthermore, the support rod includes an upper support plate and a lower rod body, the anchor plate is a boxed structure with an upper open anchor groove, the support plate is engaged with the bottom of the groove of the anchor plate, and the rod body is inserted into the opening at the bottom of the groove of the anchor plate.

[0012] Furthermore, a sealing gasket is provided between the support rod and the anchor plate.

[0013] Furthermore, the elastic buffer component includes a buffer pad, the anchor plate and the buffer pad are adhesively connected, and the buffer pad is located above the anchor plate and the support rod.

[0014] Furthermore, the buffer pad is made of rubber.

[0015] Furthermore, the elastic buffer component includes an elastic pad, the lower end of the elastic pad acts on the anchor plate, the upper end of the elastic pad acts on the support rod, and a cover plate for limiting the support rod is fixed on the anchor plate.

[0016] Furthermore, the elastic pad is a spring component or a flexible elastic material.

[0017] Beneficial effects of this application:

[0018] (1) Protective casing is used to protect the pile foundation steel bars, forming a waterproof, insulating, corrosion-resistant and penetration-resistant multi-layer protective structure on the outside of the pile foundation steel bars to prevent the cushion layer and soil from reducing the durability of the pile foundation steel bars.

[0019] (2) An elastic buffer component is formed at the end of the pile foundation steel bar to achieve an elastic buffer transition between the pile foundation steel bar and the raft slab, so that the pile foundation can adjust its own stiffness according to different situations to meet the force requirements of the building.

[0020] The aforementioned main scheme of the present application and its further options can be freely combined to form multiple schemes, all of which are schemes that can be adopted and claimed for protection in the present application; and in the present application, (non-conflicting options) can also be freely combined with each other and with other options. After understanding the present scheme, those skilled in the art can understand that there are many combinations based on the prior art and common knowledge, all of which are technical schemes to be protected by the present application, and they are not exhaustively listed here. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of this application.

[0022] Figure 2 It is a structural schematic diagram of the first elastic buffer component of the present application.

[0023] Figure 3 This is a structural breakdown diagram of the first elastic buffer component of the present application.

[0024] Figure 4It is a structural schematic diagram of the second elastic buffer component of the present application.

[0025] Figure 5 This is a structural breakdown diagram of the second elastic buffer component of the present application.

[0026] In the figure: 1-pile foundation body, 2-secondary pouring section, 3-pile foundation reinforcement, 4-protective casing, 5-support rod, 6-anchor plate, 7-buffer pad, 8-elastic pad, 9-cushion layer, 10-brick membrane, 11-soil, 12-raft slab. DETAILED DESCRIPTION

[0027] The present application is further described below in conjunction with specific embodiments and drawings.

[0028] refer to Figure 1 As shown, a structure for adjusting the stiffness of a pile foundation includes a pile foundation body 1, a secondary casting section 2, pile foundation reinforcement 3, a protective casing 4, a protective film, a protective coating, a protective filling layer, a support rod 5, an anchor plate 6, an elastic buffer component, a cushion layer 9, a brick membrane 10, a soil body 11 and a raft 12.

[0029] A brick membrane 10 with a well-shaped structure is provided in the soil body 11. The brick membrane 10 is at the same height as the soil body 11. A pile foundation body 1 and a backfill cushion layer 9 are provided inside the brick membrane 10. The cushion layer 9 is used to fill the gap between the pile foundation body 1 and the well wall. The cushion layer 9 is laid on top of the soil body 11 and the brick membrane 10 at the same time, and a raft 12 is constructed on top of the cushion layer 9.

[0030] A plurality of vertical pile foundation steel bars 3 are arranged in the pile foundation body 1. The pile foundation steel bars 3 extend out of the pile foundation body 1, and the pile foundation steel bars 3 pass through the secondary casting section 2 and the cushion layer 9 to the raft 12 in sequence, so as to realize the connection between the raft 12 and the pile foundation body 1 by using the pile foundation steel bars 3. A secondary casting section 2 is arranged at the end of the pile foundation body 1, and the secondary casting section 2 is used to embed and fix the protective sleeve 4.

[0031] A protective sleeve 4 is provided on the pile foundation steel bar 3, and the protective sleeve 4 is a corrugated tube made of plastic or rubber. The outer side of the pile foundation steel bar 3 is wrapped with a protective film, and the protective film is made of plastic. A protective coating is coated between the protective film and the pile foundation steel bar 3, and the protective coating is a butter coating. A protective filling layer is filled between the protective sleeve 4 and the protective film, and the protective filling layer is an epoxy resin filling layer.

[0032] Since the pile foundation steel bars 3 are arranged in the multi-layer building structure, the protective film, protective coating, protective filling layer and protective casing are also located in the secondary casting section 2, the cushion layer 9 to the raft 12, to protect the pile foundation steel bars 3 extending outward from the pile foundation body 1, so as to prevent the cushion layer and the soil from reducing the durability of the pile foundation steel bars.

[0033] The end of the pile foundation steel bar 3 is connected to the support rod 5, and the pile foundation steel bar 3 and the support rod 5 are welded and fixed, or the pile foundation steel bar 3 and the support rod 5 are sleeved and fixed (mechanical interference fit), so that the force of the pile foundation steel bar 3 is transmitted to the support rod 5. The support rod 5 is inserted into the anchor plate 6, and the upper end of the support rod 5 is engaged with the anchor plate 6, so when the support rod 5 is pulled downward, it can bring the anchor plate 6 with it.

[0034] The supporting rod 5 is an integrated structure, including an upper supporting plate and a lower rod body, the anchor plate 6 is a boxed structure with an upper open anchor groove, the supporting plate is engaged with the groove bottom of the anchor plate 6, the rod body is inserted into the opening at the groove bottom of the anchor plate 6, and the rod body is fixedly connected to the end of the pile foundation steel bar 3. A sealing gasket is provided between the supporting rod 5 and the anchor plate 6 to enhance the sealing between the two.

[0035] The anchor plate 6 is provided with an elastic buffer component acting on the raft 12, and the elastic buffer component is used to realize the elastic buffer transition between the pile foundation reinforcement and the raft, so that the pile foundation can adjust its own stiffness according to different situations to meet the force requirements of the building. The elastic buffer component includes two types, one is an upward buffer transition, and the other is a downward buffer transition.

[0036] refer to Figure 2 and Figure 3 As shown, the first elastic buffer component includes a buffer pad 7, which is a block structure made of rubber material. The anchor plate 6 is adhesively connected to the buffer pad 7, and the buffer pad 7 is located in the anchor groove of the anchor plate 6. The buffer pad 7 is located above the anchor plate 6 and the support rod 5.

[0037] When the pile foundation reinforcement is under tension, the support rod is clamped with the anchor plate and works together with the anchor plate to bear the tension. When the pile foundation reinforcement is under compression and produces vertical deformation, the pile foundation reinforcement acts upward to lift the support rod, thereby compressing the rubber block, avoiding direct force on the raft slab and thus avoiding stress concentration on the raft slab at the pile foundation position.

[0038] refer to Figure 4 and Figure 5 As shown, the second elastic buffer component includes an elastic pad 8 and a cover plate. The elastic pad 8 is a spring component or a flexible elastic material. The lower end of the elastic pad 8 acts on the anchor plate 6, and the upper end of the elastic pad 8 acts on the support rod 5. A cover plate for limiting the support rod 5 is fixed on the anchor plate 6. The cover plate also has the function of closing the anchor groove. At the same time, a hole is opened on the cover plate for injecting fluid flexible elastic material into the anchor plate 6.

[0039] When the pile foundation reinforcement is pulled, the support rod is clamped with the anchor plate, and works together with the anchor plate to bear the tension. At this time, the elastic pad 8 is compressed to buffer the tension, avoiding stress concentration on the single support rod 5. When vertical deformation is generated under pressure, the pile foundation reinforcement acts upward to lift the support rod, and the support rod acts on the raft.

[0040] The aforementioned basic examples and their further selected examples can be freely combined to form multiple embodiments, all of which are embodiments that can be adopted and claimed for protection in this application. In the scheme of this application, each selected example can be arbitrarily combined with any other basic examples and selected examples.

[0041] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A structure for adjusting the stiffness of a pile foundation, comprising a pile foundation body (1) and pile foundation steel bars (3) on the pile foundation body (1), characterized in that: The pile foundation steel bar (3) passes upward through the cushion layer (9) to the raft slab (12), and the end of the pile foundation steel bar (3) is connected to the support rod (5). The support rod (5) is passed through the anchor plate (6), and the upper end of the support rod (5) is engaged with the anchor plate (6). The anchor plate (6) is provided with an elastic buffer component that acts on the raft slab (12).

2. The structure for adjusting pile foundation stiffness according to claim 1, characterized in that: The end of the pile foundation body (1) is provided with a secondary pouring section (2), and the pile foundation steel bars (3) pass through the secondary pouring section (2), the cushion layer (9) and the raft slab (12) in sequence.

3. The structure for adjusting pile foundation stiffness according to claim 1 or 2, characterized in that: The pile foundation steel bar (3) is sleeved with a protective sleeve (4), the outer side of the pile foundation steel bar (3) is wrapped with a protective film, a protective coating is coated between the protective film and the pile foundation steel bar (3), and a protective filling layer is filled between the protective sleeve (4) and the protective film.

4. The structure for adjusting pile foundation rigidity according to claim 3, characterized in that: The protective sleeve (4) is a corrugated tube made of plastic or rubber, the protective film is made of plastic, the protective coating is a butter coating, and the protective filling layer is an epoxy resin filling layer.

5. The structure for adjusting pile foundation rigidity according to claim 1, characterized in that: The support rod (5) comprises an upper support plate and a lower rod body. The anchor plate (6) is a box-type structure having an upper open anchor groove. The support plate is engaged with the groove bottom of the anchor plate (6), and the rod body is inserted into the opening at the groove bottom of the anchor plate (6).

6. The structure for adjusting pile foundation stiffness according to claim 1 or 5, characterized in that: A sealing gasket is provided between the support rod (5) and the anchor plate (6).

7. The structure for adjusting pile foundation rigidity according to claim 1, characterized in that: The elastic buffer component comprises a buffer pad (7), the anchor plate (6) and the buffer pad (7) are bonded and connected, and the buffer pad (7) is located above the anchor plate (6) and the support rod (5).

8. The structure for adjusting pile foundation rigidity according to claim 7, characterized in that: The buffer pad (7) is made of rubber.

9. The structure for adjusting pile foundation rigidity according to claim 1, characterized in that: The elastic buffer assembly comprises an elastic pad (8), the lower end of the elastic pad (8) acts on the anchor plate (6), the upper end of the elastic pad (8) acts on the support rod (5), and a cover plate for limiting the support rod (5) is fixed on the anchor plate (6).

10. The structure for adjusting pile foundation rigidity according to claim 9, characterized in that: The elastic pad (8) is a spring component or a flexible elastic material.

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