CN218027787U - A connection structure used for stiffness adjustment device and prefabricated hollow pile - Google Patents

Abstract

The utility model discloses a connection structure between a stiffness adjusting device and a prefabricated hollow pile, comprising: a stiffness adjusting device, a raft, a brick tire membrane, sand and gravel, an inverted pile cap, a prefabricated hollow pile, an inverted pile The lower end of the pile cap is connected with the prefabricated hollow pile, the upper end of the inverted pile cap is connected with the stiffness adjustment device, and the upper end of the stiffness adjustment device is connected with the raft; the outer side of the inverted pile cap is fixed with a hollow brick membrane, The upper end of the brick membrane is attached to the bottom surface of the raft, and sand is filled between the inner surface of the brick membrane and the outer surface of the inverted pile cap, and between the inner surface of the brick membrane and the outer surface of the stiffness adjustment device. stone. The connection structure has the characteristics of safety and feasibility, simple construction steps, and low construction cost. It improves the working performance and construction quality of the piled raft foundation with controllable stiffness, and is conducive to promoting the application of stiffness adjustment devices in prefabricated hollow pile projects, thereby further Promote the promotion of controllable stiffness piled raft foundation technology.

Description

A connection structure used for stiffness adjustment device and prefabricated hollow pile

technical field

The utility model belongs to the technical field of foundations, in particular to a connection structure used for a stiffness adjusting device and a prefabricated hollow pile.

Background technique

Prefabricated pile refers to a pile type that is prefabricated in the factory and transported to the site for construction. It has the characteristics of fast construction speed, low cost and wide application range. In recent years, with the acceleration of urban construction, prefabricated piles have gradually become the pile type preferred by designers, which promotes the development of pile foundation technology.

Bearing capacity and deformation seem to be independent but highly coupled, and jointly determine the support stiffness of the pile foundation, which also makes it very difficult for humans to accurately intervene in the support stiffness of the pile foundation. However, through the pile-raft foundation with controllable stiffness, that is, a special stiffness adjustment device is set between the piles and rafts, so that the precise intervention and distribution of the pile foundation support stiffness and then the entire pile-raft foundation support stiffness can be realized economically and effectively. Adjustment can effectively solve the problem of pile-soil interaction of large bearing stiffness piles, variable stiffness leveling of large chassis buildings or building groups, construction of high-rise or super high-rise buildings in areas with complex geological conditions, and recycling of waste pile foundations of buildings. Solve or costly engineering problems.

Publication No. CN101487267B proposes "A Supporting Stiffness Adjustable Pile Raft Foundation and Construction Technology". This form of structure has undergone practical tests with the popularization and application of controllable stiffness pile raft foundations and achieved good results. However, this installation method is only applicable when the foundation piles of the controllable stiffness pile raft foundation are cast-in-situ piles, and when the foundation piles are prefabricated hollow piles, the stiffness adjustment device cannot be installed according to the above method, which greatly limits the use of the stiffness adjustment device in prefabricated piles. Application in pile engineering.

Utility model content

Aiming at the deficiencies of the existing technology, the utility model provides a connection structure between the stiffness adjusting device and the prefabricated hollow pile, which has the characteristics of safety and feasibility, simple construction steps, and low construction cost, and improves the controllable stiffness The working performance and construction quality of the pile-raft foundation are conducive to promoting the application of stiffness adjustment devices in prefabricated hollow pile projects, thereby further promoting the promotion of controllable stiffness pile-raft foundation technology.

In order to achieve the above technical purpose, the utility model adopts the following technical scheme: a connection structure for the stiffness adjustment device and the prefabricated hollow pile, including: stiffness adjustment device, raft, brick tire membrane, gravel, inverted pile type A pile cap and a prefabricated hollow pile, the lower end of the inverted pile cap is connected with the prefabricated hollow pile, the upper end of the inverted pile cap is connected with the stiffness adjustment device, and the upper end of the stiffness adjustment device is connected with the raft; The outer side of the inverted pile cap is fixed with a hollow brick membrane, the upper end of the brick membrane is attached to the bottom surface of the raft, and the inner surface of the brick membrane is connected to the outer surface of the inverted pile cap. Sand and gravel are filled between the surfaces, between the inner surface of the brick tire membrane and the outer surface of the stiffness adjusting device.

Further, the inverted pile cap is a straight pipe section and an inverted trapezoidal section connected sequentially from top to bottom, the height of the straight pipe section is not less than 100mm, and the height of the inverted trapezoidal section is not less than 200mm.

Further, the straight pipe section is provided with two layers of horizontal reinforcement mesh with a steel bar diameter of not less than 10 mm and a spacing of not more than 150 mm, and the force-transmitting bars are vertically arranged on the steel mesh.

Further, the stiffness adjusting device includes: a side guard plate, a stiffness adjusting device base, a stiffness adjuster, a cavity, an upper cover plate, and a positioning bolt, and one or more stiffness adjusters are arranged in the cavity, and the The stiffness adjuster is fixedly connected to the base of the stiffness adjusting device through positioning bolts, the upper cover of the stiffness adjusting device is connected to the raft, and a side guard is respectively provided at both ends of the upper cover, and each side guard One end is fixedly connected with the upper cover plate, and the other end of the side guard plate is in contact with the outer surface of the inverted pile cap.

Further, the stiffness adjuster is a frustum-shaped structure with a narrow top and a wide bottom, and the cavity is filled with waste tire particles.

Further, the arrangement of the plurality of stiffness adjusters is: a horizontal parallel arrangement or a top-to-bottom stacked arrangement.

Further, the base of the stiffness adjusting device is connected to the inverted pile cap through no less than 4 force-transmitting tendons with a diameter of no less than 12 mm and a length of no less than 200 mm.

Further, the stiffness adjusting device is provided with a grouting pipe and a deformation marking rod, and the mouth of the grouting pipe and the deformation marking rod is sealed with a waterproof plug during construction.

Further, a reinforcement cage is arranged inside the prefabricated hollow pile, and an anchoring reinforcement is arranged on the upper part of the reinforcement cage.

Further, a cushion layer, an inverted filter layer and a geotextile are sequentially arranged between the exterior of the brick tire membrane and the soil body from top to bottom.

Compared with the prior art, the utility model has the following beneficial effects:

(1) The utility model is used for the connection structure between the stiffness adjustment device and the prefabricated hollow pile. The prefabricated hollow pile is filled with the method of inserting reinforcement and pouring the core, and the inverted pile type pile cap formed by the second pouring is connected by anchoring the steel bar, which greatly improves Improve the overall strength and stiffness of the prefabricated hollow pile, make the distribution of the upper load transfer from top to bottom more uniform, make the connection between the inverted pile cap and the prefabricated hollow pile more firm, and the tensile performance and tensile strength of the connection Significantly improved shear performance;

(2) The utility model uses the secondary pouring concrete structure to form an inverted pile cap, and installs the base of the stiffness adjustment device on the inverted pile cap, which realizes the application of the stiffness adjustment device in prefabricated pile engineering and solves the problem of installation stiffness. The problem of stress concentration at the top of the prefabricated pile of the adjustment device;

(3) The utility model is used for the connection structure between the stiffness adjusting device and the prefabricated hollow pile, which has the characteristics of safety and feasibility, simple and reasonable construction steps, high construction efficiency and low construction cost, and improves the working performance of the pile raft foundation with controllable stiffness It is beneficial to promote the application of stiffness adjustment device in prefabricated hollow pile engineering, thereby further promoting the promotion of controllable stiffness pile raft foundation technology.

Description of drawings

Fig. 1 is the sectional view of the connection structure between the stiffness adjusting device and the prefabricated hollow pile of the utility model;

Fig. 2 is a plan view of the connection structure between the stiffness adjusting device and the prefabricated hollow pile of the utility model;

Among them, 1-waterproof plug; 2-grouting pipe; 3-deformed identification rod; 4-raft; 5-cushion; 6-inverted filter layer; Sand and gravel; 10-side guard plate; 11-base of stiffness adjustment device; 12-stiffness adjuster; 13-cavity; 14-top surface of pile cap; 15-bottom surface of raft slab; Rib; 18-reinforcing mesh; 19-inverted pile cap; 20-anchor reinforcement; 21-reinforcement cage; 22-prefabricated hollow pile; 23-top cover; 24-positioning bolt.

detailed description

Below in conjunction with accompanying drawing, the technical scheme of the utility model is further explained and illustrated.

As shown in Figure 1-2, the utility model provides a connection structure between the stiffness adjustment device and the prefabricated hollow pile, including: stiffness adjustment device, raft 4, brick tire membrane 8, gravel 9, inverted pile Cap 19 and prefabricated hollow pile 22, the lower end of inverted pile type pile cap 19 is connected with prefabricated hollow pile 22, the upper end of inverted pile type pile cap 19 is connected with stiffness adjustment device, the upper end of stiffness adjustment device is connected with raft 4, can use The telescopic deformation of the stiffness adjusting device adjusts the position of the stiffness adjusting device relative to the prefabricated hollow pile 22 , so as to realize the controllable adjustment of the stiffness of the pile top structure of the prefabricated hollow pile 22 . The outer side of the inverted pile cap 19 is fixed with a hollow brick membrane 8, the upper end of the brick membrane 8 is attached to the raft bottom surface 15 of the raft 4, and the inner surface of the brick membrane 8 is in contact with the inverted pile cap 19. Sand and gravel 9 are filled between the outer surfaces of the brick membrane 8 and the outer surface of the stiffness adjustment device, and the sand and gravel 9 are filled with the fixing effect of the brick membrane 8, and the stiffness can be adjusted by using the sand and gravel 9 skillfully. The positions of the device and the inverted pile cap 19 are positioned and fixed, which is convenient for installing the raft 4, thereby making the construction more convenient.

The inverted pile cap 19 in the utility model is a concrete structure with an inverted trapezoidal structure formed by erecting a prefabricated steel form on the top of the prefabricated hollow pile 22 and performing secondary pouring. The inverted pile cap 19 is in order from top to bottom. For the connected straight pipe section and inverted trapezoidal section, the height of the straight pipe section is not less than 100mm, and the height of the inverted trapezoidal section is not less than 200mm, so that the upper load can be transmitted to the prefabricated hollow pile more evenly, which solves the problem of installing the stiffness adjustment device on the top of the prefabricated pile. The problem of stress concentration; there are two layers of steel bars with a diameter of not less than 10 mm and a spacing of not more than 150 mm in the straight pipe section. It can form a network structure and enhance the bonding performance between steel bars and concrete, so that the load on the superstructure can be evenly distributed, and the crack resistance of the secondary pouring concrete structure can be significantly improved, and the setting of vertical force-transmitting bars 17 can further improve the secondary concrete structure. The overall strength and rigidity of the poured concrete structure can meet the load-bearing requirements.

The stiffness adjustment device in the utility model includes: side guard plate 10, stiffness adjustment device base 11, stiffness adjuster 12, cavity 13, upper cover plate 23, positioning bolt 24, and cavity 13 is provided with one or more stiffness adjustment 12, the stiffness adjuster 12 is made of steel alloy, and is a conical structure with a narrow top and a wide bottom. The arrangement of multiple stiffness adjusters 12 is: horizontally arranged in parallel or stacked from top to bottom In this way, the cavity 13 is filled with waste tire particles as a buffer material, and the stiffness adjuster 12 is fixedly connected to the base 11 of the stiffness adjusting device through the positioning bolt 24, and the supporting stiffness of the stiffness adjuster 12 can be adjusted by changing the stiffness of the steel alloy material, and then The aim of realizing the adjustable and controllable support stiffness of the piled raft foundation of high-rise buildings is achieved. The upper cover plate 23 of the stiffness adjusting device is connected with the raft 4, and the two ends of the upper cover plate 23 are respectively provided with a side guard plate 10, and one end of each side guard plate 10 is fixedly connected with the upper cover plate 23, and the side guard plate 10 The other end is in contact with the outer surface of the inverted pile cap 19, and the setting of the side guard plate 10 can ensure that the buffer material filled in the cavity 10 is dense and does not leak.

In the utility model, the stiffness adjusting device is provided with a grouting pipe 2 and a deformed marking rod 3, and the grouting pipe 2 and the deformed marking rod 3 are sealed with a waterproof plug 1 during construction to prevent the nozzle from being blocked.

In the utility model, the base 11 of the stiffness adjusting device is connected to the inverted pile cap 19 through no less than 4 force-transmitting ribs 17 with a diameter of no less than 12 mm and a length of no less than 200 mm, which can prevent the stiffness adjusting device from being used. The pile cap top surface 14 inclines when the horizontal displacement occurs during the process and the stiffness adjustment device stretches and deforms, so that the structure of the stiffness adjustment device is relatively stable and the performance is relatively reliable. At the same time, the deformation of the stiffness adjustment device can be accurately observed. In the utility model, the base 11 of the stiffness adjusting device should be a high-strength steel plate with a thickness not less than 10 mm.

In the utility model, the prefabricated hollow pile 22 is provided with a reinforcing cage 21, and the upper part of the reinforcing cage 21 is provided with an anchoring steel bar 20. The setting of the reinforcing cage 21 is used to improve the overall strength and rigidity of the prefabricated hollow pile 22, so that it can be transmitted from top to bottom. The upper load distribution is more uniform, and the setting of the anchoring steel bar 20 makes the connection between the pile cap 19 and the prefabricated pile more solid, which improves the tensile performance and shear performance of the connection between the two.

In the utility model, a cushion layer 5, an inverted filter layer 6 and a geotextile 7 are sequentially arranged between the exterior of the brick membrane 8 and the soil body from top to bottom, which can improve the integrity of the pile and raft foundation to a certain extent.

The utility model is used for the construction method of the stiffness adjusting device and the connection structure between the prefabricated hollow pile, comprising the following steps:

The first step is to insert reinforcement cage 21 and longitudinal reinforcement in the inner core of prefabricated hollow pile 22, and stretch out an appropriate amount of anchor reinforcement 20 on the top of reinforcement cage 21 in order to overlap with cast-in-place inverted pile type pile cap 19, Concrete pouring is carried out to the hollow inner core of reinforcement cage 21 again;

In the second step, the prefabricated steel mold 16 is supported on the top surface of the prefabricated hollow pile 22, and layered concrete is poured and tamped, and the steel mesh 18 of the horizontal structure is placed in the pouring process, and the transmission rod connected to the base 11 of the steel bar adjustment device is inserted. Rib 17, complete the pouring of the secondary pouring section, remove the mold after curing and forming, and form an inverted pile cap 19;

The third step is to install the stiffness adjuster 12 inside the stiffness adjuster, and then the stiffness adjuster is welded to the center position of the pile cap top surface 14 by the steel bar adjuster base 11 and the force-transmitting rib 17, so that the side of the stiffness adjuster Guard plate 10 is just in contact with the outer surface of inverted pile type pile cap 19;

The fourth step is to make a brick tire mold 8 outside the stiffness adjustment device and the inverted pile cap 19, and connect the inner surface of the brick tire membrane 8 with the outer wall of the side guard plate 10 of the stiffness adjustment device and the outer surface of the inverted pile cap 19. The space is filled with gravel 9, and a cushion layer 5, an inverted filter layer 6, and a geotextile 7 are arranged between the exterior of the brick membrane 8 and the soil;

Step 5: Concrete raft 4 is poured on the upper part of the stiffness adjustment device and brick tire mold 8, and steel pipes are pre-embedded in the raft 4, so that the grouting pipe 2 and the deformation marking rod on the top of the stiffness adjustment device after the raft 4 is poured 3 can pass through the steel pipe and extend out of the raft 4;

Step 6: After the construction is completed, observe the deformation amount of the stiffness adjustment device through the deformation indicator rod 3. After the displacement adjustment of the prefabricated hollow pile 22 equipped with the stiffness adjustment device is completed, the prefabricated pile 22 and the raft 4 are connected through the extended grouting pipe 2. The high-performance composite grouting material is poured into the rigidity adjusting device between the two, so that the prefabricated hollow pile 22 is connected with the raft 4 to form a whole.

By adopting the above technical scheme, the construction method of the stiffness adjusting device and the connection structure between the prefabricated piles is safe and feasible, the steps are simple and reasonable, the construction cost is low, the construction efficiency can be effectively improved, and the construction quality can be effectively improved at the same time.

The above are only preferred implementations of the utility model, and the scope of protection of the utility model is not limited to the above implementations, and all technical solutions under the idea of the utility model all belong to the protection scope of the utility model. It should be pointed out that for those of ordinary skill in the art, some improvements and modifications without departing from the principle of the utility model should be regarded as the protection scope of the utility model.

Claims (10)

1. A connection construction for a rigidity adjusting device and a precast hollow pile, characterized by comprising: the device comprises a rigidity adjusting device, a raft plate (4), a brick moulding bed (8), gravels (9), an inverted pile cap (19) and a prefabricated hollow pile (22), wherein the lower end of the inverted pile cap (19) is connected with the prefabricated hollow pile (22), the upper end of the inverted pile cap (19) is connected with the rigidity adjusting device, and the upper end of the rigidity adjusting device is connected with the raft plate (4); the utility model discloses a raft structure, including the type of falling stake pile cap, the outside fixed mounting of type of falling stake pile cap (19) has hollow brick fetal membrane (8), the upper end of brick fetal membrane (8) and raft bottom surface (15) laminating of raft board (4), pack grit (9) between the internal surface of brick fetal membrane (8) and the surface of type of falling stake pile cap (19), between the internal surface of brick fetal membrane (8) and rigidity adjusting device's the surface.

2. A connecting construction between a rigidity adjusting device and a precast hollow pile according to claim 1, characterized in that the inverted pile cap (19) is a straight pipe section and an inverted trapezoid section which are connected in sequence from top to bottom, the height of the straight pipe section is not less than 100mm, and the height of the inverted trapezoid section is not less than 200mm.

3. A connection structure for a stiffness adjusting device and a prefabricated hollow pile according to claim 2, wherein two layers of horizontal reinforcing mesh (18) with the diameter not less than 10 mm and the distance not more than 150 mm are arranged in the straight pipe section, and the force transmission rib (17) is vertically arranged on the reinforcing mesh (18).

4. A connection construction for a stiffness adjustment device to a pre-cast hollow pile according to claim 1, wherein the stiffness adjustment device comprises: side guard plate (10), rigidity adjusting device base (11), rigidity regulator (12), cavity (13), upper cover plate (23), positioning bolt (24), be equipped with one or more rigidity regulator (12) in cavity (13), rigidity regulator (12) pass through positioning bolt (24) and rigidity adjusting device base (11) fixed connection, rigidity adjusting device's upper cover plate (23) are connected with raft board (4), the both ends of upper cover plate (23) are equipped with one side guard plate (10) respectively, the one end and the upper cover plate (23) fixed connection of every side guard plate (10), the other end and the outer surface contact of type pile cap (19) of falling the stake of side guard plate (10).

5. A connection construction for a stiffness adjusting device and a pre-fabricated hollow pile according to claim 4, characterized in that the stiffness adjuster (12) is of a truncated cone structure with a narrow top and a wide bottom, and the cavity (13) is filled with waste tire particles.

6. A connection construction for a stiffness adjustment device to a pre-cast hollow pile according to claim 4, characterised in that a plurality of stiffness adjusters (12) are arranged in a manner that: horizontal parallel arrangement or arrangement from top to bottom.

7. A connection construction between a rigidity adjusting device and a precast hollow pile according to claim 4, characterized in that the rigidity adjusting device base (11) is connected with the inverted pile type pile cap (19) through not less than 4 force transmission ribs (17) with the diameter of not less than 12 mm and the length of not less than 200mm.

8. The connection structure for the rigidity adjusting device and the prefabricated hollow pile as claimed in claim 1, wherein the rigidity adjusting device is provided with a grouting pipe (2) and a deformation identification rod (3), and the grouting pipe (2) and the deformation identification rod (3) are subjected to pipe orifice closing by a waterproof plug (1) during construction.

9. A connection construction between a stiffness adjusting device and a precast hollow pile according to claim 1, wherein a reinforcement cage (21) is provided in the precast hollow pile (22), and an anchoring reinforcement (20) is provided at an upper portion of the reinforcement cage (21).

10. The connection structure for the rigidity adjusting device and the precast hollow pile according to claim 1, wherein a cushion layer (5), a reversed filter layer (6) and a geotextile (7) are sequentially arranged between the outside of the brick bed membrane (8) and a soil body from top to bottom.

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