CN214994144U

CN214994144U - Uplift pile for subway station in water-rich stratum

Info

Publication number: CN214994144U
Application number: CN202120109874.6U
Authority: CN
Inventors: 罗伟庭; 邝利军; 陈立军; 陈冲; 冯果; 杜佳明; 岳强; 王濯; 安腾飞; 殷昊东; 吴镇清; 熊立财; 李子丰; 张永杰
Original assignee: Changsha University of Science and Technology; China Construction Fifth Engineering Bureau Co Ltd
Current assignee: Changsha University of Science and Technology; China Construction Fifth Engineering Bureau Co Ltd
Priority date: 2021-01-15
Filing date: 2021-01-15
Publication date: 2021-12-03
Anticipated expiration: 2031-01-15

Abstract

The utility model provides a water-rich stratum subway station uplift pile, includes at the bottom of pile body and the stake, the diameter at the bottom of the stake is greater than the pile body, the pile body includes concrete dado and pile body concrete from outside to inside in proper order, be equipped with the dado reinforcing bar in the concrete dado, be equipped with the steel reinforcement cage in the pile body concrete, the axial has laid multiunit bar planting on the pile body, and every group bar planting includes and uses the pile body as the many bar planting that the radial ring shape was laid at the center, the one end of bar planting is fixed on the dado reinforcing bar, and the other end stretches out on the concrete dado inserts stake downthehole wall. An object of the utility model is to provide an uplift pile structure for rich water stratum subway station improves the anti effect of floating of subway station.

Description

Uplift pile for subway station in water-rich stratum

Technical Field

The patent relates to subway engineering construction technical field, especially relates to a rich water stratum subway station uplift pile.

Background

In the regions with higher groundwater level, the self weight of the structure can not meet the anti-floating requirement because of light weight of the soil covered on the structure, the anti-floating problem of the underground structure is more prominent, anti-floating measures are required to be adopted, in the construction of urban rail transit engineering, the anti-floating stability is one of the key technical problems in the design and construction process, particularly in subway stations in water-rich stratums, the technical measures not only have great influence on the engineering investment, but also have great influence on the engineering safety, particularly on the long-term stability of operation, the uplift pile is a common uplift measure, is different from a common foundation pile, has the unique performance of the uplift pile and is in the traditional sense, the uplift resistance of the uplift pile is very limited, and for water-rich strata, because the soil body is loose, how to increase the friction force between the pile body and the surrounding soil body and improve the uplift resistance of the uplift pile is a calculation problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an increase pile body and the frictional force of the soil body on every side, improve rich water stratum subway station uplift pile of uplift pile resistance to plucking ability.

The utility model discloses a following technical scheme realizes:

the utility model provides a water-rich stratum subway station uplift pile, includes at the bottom of pile body and the stake, the diameter at the bottom of the stake is greater than the pile body, the pile body includes concrete dado and pile body concrete from outside to inside in proper order, be equipped with the dado reinforcing bar in the concrete dado, be equipped with the steel reinforcement cage in the pile body concrete, the axial has laid multiunit bar planting on the pile body, and every group bar planting includes and uses the pile body as the many bar planting that the radial ring shape was laid at the center, the one end of bar planting is fixed on the dado reinforcing bar, and the other end stretches out on the concrete dado inserts stake downthehole wall.

In the present embodiment, the thickness of the concrete retaining wall is not less than 10 cm.

In this embodiment, the embedded bars and the concrete retaining wall are connected to form a whole when the pile body concrete is poured.

In the present embodiment, the concrete retaining wall is made of C30 concrete.

In this embodiment, the concrete retaining wall includes retaining wall reinforcing bars and a steel retaining cylinder disposed outside the retaining wall reinforcing bars.

In this embodiment, the pile bottom is a circular truncated cone, the top surface of the pile bottom is a small end, and the diameter of the top surface of the pile bottom is the same as that of the pile body.

In this embodiment, a groove is provided at a position corresponding to each embedded bar on the inner wall of the concrete retaining wall, and when concrete is poured into the pile body, concrete is poured into the groove to form a concrete foundation.

By adopting the structure, the pile bottom adopts a bottom expanding form, the friction force is increased, the planting bars which are radially distributed are implanted around the pile body, a grouting space is reserved around the soil body in which the planting bars are inserted, the friction force of the uplift pile is further increased by grouting the soil body, the planting bars are welded on the retaining wall steel bars, when the concrete retaining wall is poured, the grooves are arranged at the positions corresponding to the planting bars on the concrete retaining wall template, so that the concrete base for improving the supporting force of the planting bars is formed at the positions where the planting bars extend out of the concrete retaining wall, the stability of the uplift pile is improved, when the pile body is poured, the concrete retaining wall and the pile body are poured into a whole, the structural stability is improved, and the anti-floating capacity of the uplift pile is enhanced.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a top view of the pile structure of the present invention;

FIG. 3 is a structural front view of the tendon-embedded segment of the present invention;

description of the drawings: 1. pile bottom; 2. concrete dado; 3. planting bars; 4. wall-protecting reinforcing steel bars; 5. a reinforcement cage; 6. pile body concrete; 7. a concrete base.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention can be embodied in many different forms other than those specifically described herein, and it will be apparent to those skilled in the art that similar modifications can be made without departing from the spirit and scope of the invention, and it is therefore not to be limited to the specific embodiments disclosed below.

As shown in fig. 1 to 3, a water-rich stratum subway station uplift pile comprises a pile body and a pile bottom 1, the pile bottom 1 is of a circular truncated cone shape, the top surface of the pile bottom is the same as the diameter of the bottom surface of the pile body, the diameter of the pile bottom 1 is larger than the pile body, the pile body sequentially comprises a concrete retaining wall 2 and pile body concrete 6 from outside to inside, retaining wall reinforcing steel bars 4 are pre-embedded in the concrete retaining wall 2, reinforcing cages 5 are pre-embedded in the pile body concrete 6, a plurality of groups of planting bars are distributed on the pile body along the axial direction, each group of planting bars comprises a plurality of planting bars 3 distributed along the radial direction and taking the pile body as the center, one ends of the planting bars 3 are welded on the retaining wall reinforcing steel bars 4, and the other ends of the planting bars extend out of the concrete retaining wall 2 to be inserted into the inner wall of a pile hole.

When meetting the great condition of water yield, can adopt the steel to protect a construction, protect a section of thick bamboo with the steel and pre-buried in concrete dado 2, guarantee uplift pile's intensity, the outside of concrete dado is equipped with outside convex, along the concrete base 7 that the bar planting direction extends in bar planting position for the position that the bar planting stretches out the concrete dado forms the concrete base that improves the bar planting holding power, has improved uplift pile's stability.

The construction process of the present application is specifically described below:

1) excavating and constructing uplift piles:

manually excavating pile holes, determining the excavation height of each segment according to the difference of soil properties, controlling the section size, firstly excavating the upper part of the middle part of each pile hole, and excavating the bottom part of each pile hole towards the periphery to form the bottom of each pile hole, wherein the diameter of each pile hole is more than 200mm larger than the diameter of each pile foundation;

2) and (3) bar planting construction:

pressing a steel casing into a pile hole, placing a retaining wall steel bar 4 outside the steel casing, installing a concrete retaining wall template, arranging a groove and a through hole for the embedded steel bar 3 to pass through at the position of the concrete retaining wall template corresponding to the embedded steel bar 3, passing one end of the embedded steel bar 3 through the through hole of the concrete retaining wall template, welding the other end of the embedded steel bar 3 with the retaining wall steel bar 4, and then pouring a concrete retaining wall 2, wherein the concrete retaining wall template is an assembled template and is convenient to disassemble;

3) pouring construction of the uplift pile:

and (3) vertically hoisting the reinforcement cage 5 by using a truck crane and placing the reinforcement cage 5 into an inner hole of the concrete dado, positioning and detecting the reinforcement cage 5 after the reinforcement cage is installed and connected in place, ensuring that the center deviation is not more than 5cm, pouring pile body concrete 6 after the positioning is finished, vibrating the concrete by using a vibrating rod, and finishing the concrete pouring at one time.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. The utility model provides a rich water stratum subway station uplift pile which characterized in that: including at the bottom of pile body and the stake (1), the diameter at the bottom of the stake (1) is greater than the pile body, the pile body includes concrete dado (2) and pile body concrete (6) from outside to inside in proper order, be equipped with dado reinforcing bar (4) in concrete dado (2), be equipped with steel reinforcement cage (5) in pile body concrete (6), lay multiunit bar planting (3) along the axial on the pile body, every group bar planting (3) include along many bar planting (3) that radial annular was laid as the center with the pile body, the one end of bar planting (3) is fixed on dado reinforcing bar (4), and the other end stretches out on concrete dado (2) insert the stake downthehole wall.

2. The uplift pile for a subway station in a water-rich stratum according to claim 1, wherein: the thickness of the concrete retaining wall (2) is not less than 10 cm.

3. The uplift pile for a subway station in a water-rich stratum according to claim 1, wherein: the embedded steel bars (3) and the wall protection steel bars (4) are connected into a whole.

4. The uplift pile for a subway station in a water-rich stratum according to claim 1, wherein: the concrete retaining wall (2) is made of C30 concrete.

5. The uplift pile for a subway station in a water-rich stratum according to claim 1, wherein: the concrete retaining wall (2) comprises retaining wall reinforcing steel bars (4) and steel retaining cylinders arranged on the outer sides of the retaining wall reinforcing steel bars (4).

6. The uplift pile for a subway station in a water-rich stratum according to claim 1, wherein: the pile bottom (1) is of a circular truncated cone shape, the top surface of the pile bottom (1) is a small end, and the diameter of the top surface of the pile bottom (1) is the same as that of the pile body.

7. The uplift pile for a subway station in a water-rich stratum according to any one of claims 1 to 6, wherein: the concrete retaining wall is characterized in that grooves are formed in the corresponding positions of the embedded steel bars (3) on the inner wall of the concrete retaining wall (2), and when the pile body concrete (6) is poured, concrete is poured into the grooves to form a concrete base (7).