CN211773804U

CN211773804U - Prefabricated precipitation tubular pile structure in subway station foundation ditch

Info

Publication number: CN211773804U
Application number: CN201922144924.XU
Authority: CN
Inventors: 张伟; 方华昌; 陈豪; 朱刚; 柴栋
Original assignee: CCCC First Highway Engineering Co Ltd; CCCC Tunnel Engineering Co Ltd
Current assignee: CCCC First Highway Engineering Co Ltd; CCCC Tunnel Engineering Co Ltd
Priority date: 2019-12-03
Filing date: 2019-12-03
Publication date: 2020-10-27
Anticipated expiration: 2029-12-03

Abstract

The utility model relates to a prefabricated precipitation tubular pile structure in subway station foundation ditch, prefabricated precipitation tubular pile include multistage coaxial coupling's hollow cylindric structure's precast pile, and top-down includes first precast pile, second precast pile, third precast pile and foundation pile respectively, sets up a plurality of third precast piles according to foundation ditch degree of depth demand, first precast pile and second precast pile be connected through block structure respectively between second precast pile and the third precast pile, and is adjacent between the third precast pile through flange joint between third precast pile and the foundation pile, the external diameter of first precast pile is greater than the external diameter of second precast pile, the external diameter of second precast pile is greater than the external diameter of third precast pile, the external diameter of third precast pile is unanimous with the foundation pile external diameter. According to the aperture change of the pre-drilling well, the outer side of the precast tubular pile is always attached to the wall of the pre-drilling well through the precast piles with the two-stage outer diameters gradually increased on the upper portion of the tubular pile structure, and the stability of the precast precipitation tubular pile structure is guaranteed.

Description

Prefabricated precipitation tubular pile structure in subway station foundation ditch

Technical Field

The utility model relates to a construction technical field, concretely relates to prefabricated precipitation tubular pile structure in subway station foundation ditch.

Background

With the acceleration of urbanization process in China, the development and utilization of urban underground space become more and more common, and complex foundation pit engineering becomes a controllable engineering for engineering construction of municipal administration, subway and the like. Especially, the underground water treatment problem of the excavation of the subway station can cause the bearing capacity of the foundation to be reduced if a large amount of underground water is pumped and drained, so that the stability of surrounding buildings is threatened, how to control the underground water well is reduced, the negative influence of the underground water on the excavation and supporting structure construction of the subway station foundation pit is reduced, and the underground water treatment method becomes an important and difficult construction link in the subway station foundation pit construction.

Moreover, in the subway station foundation pit construction, the underground water level is generally required to be reduced to meet the requirements of the building enclosure and the excavation construction, so that a certain number of well point water filter pipes or dewatering wells are generally arranged around the excavation surface of the foundation pit, the construction site is increased, the construction period is prolonged, economic waste is caused, the project period and the construction cost are increased, and in addition, the dewatering wells lose the functions after the subway station foundation pit is excavated.

At present, precast concrete tubular piles are generally used in foundation pit pile foundation engineering, and the bearing capacity of a soil layer is improved. The structure and construction method of a laminated pile disclosed in chinese patent application No. CN200310101987.8, wherein the reinforced concrete jacket can be fabricated in one step in a factory or the reinforcement cage in the jacket is welded to the precast reinforced concrete tubular pile or steel pipe as the inner core, then the semi-finished pile is placed in the pre-drilled pile hole, and then the filling material is poured inside and outside to complete the lamination. However, the pore diameter of the pre-drilled pile hole is difficult to ensure the vertical consistency due to factors such as drilling requirements or soil layer slip, and the pore diameter of the top end is basically slightly larger than that of the bottom end, so that a gap exists between the tubular pile at the upper end and the inner wall of the drilled well after the tubular pile is sunk, and the stability of the tubular pile in the soil body is influenced.

SUMMERY OF THE UTILITY MODEL

Problem to in the above-mentioned technical background, the utility model aims at providing a prefabricated precipitation tubular pile structure in subway station foundation ditch improves the efficiency of construction and the installation steadiness of tubular pile.

In order to realize the above purpose, the utility model discloses a technical scheme be:

a prefabricated precipitation tubular pile structure in a foundation pit of a subway station comprises a plurality of sections of prefabricated piles with hollow cylindrical structures, wherein the prefabricated piles respectively comprise a first prefabricated pile, a second prefabricated pile, a third prefabricated pile and a bottom pile from top to bottom, the first prefabricated pile, the second prefabricated pile, the third prefabricated pile and the bottom pile are coaxially connected, the height of the prefabricated precipitation tubular pile is extended to a preset height by arranging a plurality of third precast piles according to the depth requirement of a foundation pit, the first precast pile and the second precast pile are respectively connected through a clamping structure, the second precast pile and the third precast pile are respectively connected through flanges, the adjacent third precast piles are connected through flanges, and the third precast pile and a bottom pile are connected through flanges, the outer diameter of the first precast pile is larger than that of the second precast pile, the outer diameter of the second precast pile is larger than that of the third precast pile, and the outer diameter of the third precast pile is consistent with that of the bottom pile.

Furthermore, a plurality of water permeable pore channels which are distributed in a staggered mode are formed in the peripheral wall of the third precast pile, one end of each water permeable pore channel is communicated with the inside of the third precast pile, and the other end of each water permeable pore channel is communicated with a peripheral soil body.

Furthermore, both ends of the water permeable pore canal are provided with a filtering grate.

Furthermore, a plurality of material penetrating holes are formed in the bottom end of the bottom pile.

Furthermore, the bottom end of the bottom pile is of a conical structure, and material penetrating holes are formed in the conical side wall.

Furthermore, concrete materials are poured through the material penetrating holes so that the bottom piles are stably connected with peripheral soil bodies.

Furthermore, a boss is formed at the connecting position of the upper end of the third precast pile and the second precast pile in an upward extending mode, the inner diameter of the bottom end of the second precast pile is the same as the outer diameter of the boss, and the second precast pile is clamped at the upper end of the third precast pile.

The technical effects of the utility model reside in that:

1. the utility model discloses prefabricated precipitation tubular pile structure utilizes the soil layer to the bearing effect of stake in subway station foundation ditch, according to the aperture change of well drilling in advance, makes the outside of prefabricated tubular pile laminate with the well wall of a well of drilling in advance all the time through the gradual increase precast pile of two-stage external diameter on the upper portion of tubular pile structure, guarantees the steadiness of prefabricated precipitation tubular pile structure.

2. Use the utility model discloses prefabricated precipitation tubular pile structure carries out precipitation to peripheral soil body and handles, when guaranteeing the precipitation effect, utilizes the material hole of passing through on the foundation pile to pour concrete cement mortar, makes thick liquids outwards permeate and consolidate with peripheral soil body through passing through the material hole, further improves the steadiness of prefabricated precipitation tubular pile structure, improves the soil body and provides sufficient support for the foundation ditch.

Drawings

Fig. 1 is a schematic structural view of the structure of the prefabricated precipitation pipe pile in the subway station foundation pit of the utility model;

fig. 2 is the utility model discloses the structural schematic of third precast pile in the precast precipitation tubular pile structure.

Reference numerals: 1-a first precast pile; 2-second precast pile; 3-a third precast pile; 4-bottom pile; 5-water-permeable pore canals; 6-material through holes; 7-conical structure; 8-drilling; 9-hollow drainage pipe; 301-boss; 302-filtration grate.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.

Referring to attached drawings 1-2, a prefabricated precipitation tubular pile structure in a foundation pit of a subway station comprises a plurality of prefabricated piles with hollow cylindrical structures, wherein the prefabricated piles respectively comprise a first prefabricated pile 1, a second prefabricated pile 2, a third prefabricated pile 3 and a bottom pile 4 from top to bottom, the first prefabricated pile 1, the second prefabricated pile 2, the third prefabricated pile 3 and the bottom pile 4 are coaxially connected, the height of the prefabricated tubular pile is extended to a preset height by arranging a plurality of third prefabricated piles 3 according to the depth requirement of the foundation pit, the first prefabricated pile 1 and the second prefabricated pile 2 as well as the second prefabricated pile 2 and the third prefabricated pile 3 are respectively connected through a clamping structure, the adjacent third prefabricated piles 3 and the bottom pile 4 are connected through flanges, the outer diameter of the first prefabricated pile 1 is larger than the outer diameter of the second prefabricated pile 2, the outer diameter of the second precast pile 2 is larger than that of the third precast pile 3, and the outer diameter of the third precast pile 3 is consistent with that of the bottom pile 4.

The utility model discloses prefabricated precipitation tubular pile structure utilizes the soil layer to the bearing effect of stake in subway station foundation ditch, according to the aperture change of well drilling in advance, makes the outside of precast tubular pile laminate with the 8 wall of a well of drilling in advance all the time through the gradual precast pile of two-stage external diameter (first precast pile 1, second precast pile 2, third precast pile 3 and foundation pile 4) on the upper portion of tubular pile structure, guarantees the steadiness of prefabricated precipitation tubular pile structure.

When the prefabricated pile is used, a corresponding number of third prefabricated piles 3 are selected according to the requirement of the depth of a pre-drilled well, the third prefabricated piles 3 and the bottom piles 4 are fixedly connected, then the pre-connected third prefabricated piles 3 and the bottom piles 4 are sunk into the pre-drilled well, then the second prefabricated piles 2 and the first prefabricated piles 1 are sequentially installed, and the construction of the prefabricated pipe piles is completed.

Furthermore, a plurality of water permeable pore canals 5 distributed in a staggered manner are formed in the peripheral wall of the third precast pile 3, one end of each water permeable pore canal 5 is communicated with the inside of the third precast pile 3, and the other end of each water permeable pore canal 5 is communicated with a peripheral soil body.

Use the utility model discloses the third precast pile that lies in rich water soil layer in the prefabricated precipitation tubular pile structure carries out precipitation to the peripheral soil body and handles, wherein, the pore 5 that permeates water is linked together with the cavity drainage pipe 9 of third precast pile 3's inside, and moisture is through permeating water in the pore 5 gets into cavity drainage pipe 9 in the rich water soil layer to can carry out drainage treatment through equipment such as immersible pump, guarantee precipitation effect.

Furthermore, both ends of the water permeable passage 5 are provided with a filtering grate 302.

Further, a plurality of material penetrating holes 6 are formed in the bottom end of the bottom pile.

Furthermore, the bottom end of the bottom pile is a conical structure 7, and a material penetrating hole 6 is formed in the conical side wall.

Furthermore, concrete is poured through the material penetrating holes 6 to ensure that the bottom piles 4 are stably connected with the peripheral soil body.

After the construction and installation of the precast tubular pile are completed, only a small amount of concrete mortar needs to be poured into the tubular pile, and the mortar slurry is enabled to permeate outwards and be solidified with a peripheral soil body by utilizing the material permeating holes 6 on the bottom pile 4, so that the stability of the precast precipitation tubular pile structure is further improved, and the soil body is improved to provide enough support for a foundation pit.

Furthermore, a boss 301 is formed at the connection position of the upper end of the third precast pile 3 and the second precast pile 2 in an upward extending manner, and the inner diameter of the bottom end of the second precast pile 2 is the same as the outer diameter of the boss 301, so that the second precast pile 2 is clamped at the upper end of the third precast pile 3. The installation is convenient, improves the efficiency of construction.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the principles of the present invention may be applied to any other embodiment without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A prefabricated precipitation tubular pile structure in a foundation pit of a subway station is characterized in that the prefabricated precipitation tubular pile comprises a plurality of sections of prefabricated piles with hollow cylindrical structures, the prefabricated piles respectively comprise a first prefabricated pile, a second prefabricated pile, a third prefabricated pile and a bottom pile from top to bottom, the first prefabricated pile, the second prefabricated pile and the third prefabricated pile are coaxially connected with the bottom pile, the height of the prefabricated precipitation tubular pile is extended to a preset height by arranging a plurality of third prefabricated piles according to the depth requirement of the foundation pit, the first prefabricated pile and the second prefabricated pile are respectively connected with the third prefabricated pile through clamping structures, the adjacent third prefabricated piles and the bottom pile are connected through flanges, the outer diameter of the first prefabricated pile is larger than that of the second prefabricated pile, the outer diameter of the second prefabricated pile is larger than that of the third prefabricated pile, and the outer diameter of the third precast pile is consistent with that of the bottom pile.

2. The prefabricated precipitation tubular pile structure in the subway station foundation pit as claimed in claim 1, wherein a plurality of water permeable pore canals are formed in the peripheral wall of the third precast pile and distributed in a staggered manner, one end of each water permeable pore canal is communicated with the inside of the third precast pile, and the other end of each water permeable pore canal is communicated with a peripheral soil body.

3. The prefabricated water reducing pipe pile structure in the subway station foundation pit according to claim 2, wherein two ends of the water permeable pore canal are provided with a filtering grate.

4. The precast water reducing pipe pile structure in the subway station foundation pit according to claim 1, wherein a plurality of material penetrating holes are formed in the bottom end of the bottom pile.

5. The precast water reducing pipe pile structure in the subway station foundation pit according to claim 1, wherein the bottom end of the bottom pile is of a conical structure, and a material penetrating hole is formed in a conical side wall.

6. The structure of the prefabricated precipitation pipe pile in the subway station foundation pit as claimed in claim 4 or 5, wherein the bottom pile is firmly connected with the peripheral soil body by pouring concrete through the material penetrating hole.

7. The structure of claim 1, wherein a boss is formed by upward extending the joint of the upper end of the third precast pile and the second precast pile, the inner diameter of the bottom end of the second precast pile is the same as the outer diameter of the boss, and the second precast pile is clamped at the upper end of the third precast pile.