CN215406141U

CN215406141U - Take canvas slip casting club-footed bored concrete pile structure

Info

Publication number: CN215406141U
Application number: CN202120043275.9U
Authority: CN
Inventors: 江泳; 管玉国; 罗坚颖
Original assignee: Future Land Holdings Group Co ltd
Current assignee: Future Land Holdings Group Co ltd
Priority date: 2021-01-08
Filing date: 2021-01-08
Publication date: 2022-01-04
Anticipated expiration: 2031-01-08

Abstract

The utility model relates to a grouting and bottom-expanding cast-in-place pile structure with waterproof canvas, which comprises a pile hole, wherein a pile body is arranged in the pile hole, the pile body comprises a reinforcement cage and concrete, the reinforcement cage is poured in the concrete, the lower section of the pile body is bound with the waterproof canvas through an upper reinforcing steel wire and a lower reinforcing steel wire, and cement mortar is filled between the waterproof canvas and the pile body. The utility model relates to a grouting and bottom-expanding cast-in-place pile structure with waterproof canvas, which can solve the problems that the traditional construction process is complicated, the construction period is prolonged, and a special squeezing and expanding device is required to replace a drill bit; the construction of the bottom-expanded cast-in-place pile is greatly influenced by soil layers and depths, and holes are easy to collapse in soft soil areas, so that expanded heads are difficult to form; the problems of difficult slag removal and difficult control of bearing capacity and deformation of the pedestal cast-in-place pile are solved due to the large thickness of the slag at the pile end.

Description

Take canvas slip casting club-footed bored concrete pile structure

Technical Field

The utility model relates to a grouting and bottom-expanding cast-in-place pile structure with waterproof canvas, and belongs to the technical field of civil engineering.

Background

Pile foundation engineering is widely used in underground engineering. The cast-in-situ bored pile has deep penetration and large bearing capacity; the cast-in-situ bored pile is a non-soil-squeezing pile, and has small influence on the surrounding environment; the construction equipment is simple. However, the cast-in-situ bored pile is limited by construction process and soil layer, and pile forming quality is not easy to control; the pile soil binding force is small, and the pile body strength is surplus; the economic benefit is not obvious.

When the traditional bottom-expanding cast-in-place pile is constructed, after the upper pore-forming reaches the designed elevation, the hole-expanding drill bit is replaced for expanding, then concrete is poured to form a bottom expanding head, and the bearing capacity of the pile end is greatly improved. However, the following problems still remain: the traditional construction process is complex, the construction period is prolonged, and a special squeezing and expanding device is needed to replace a drill bit; the construction of the bottom-expanded cast-in-place pile is greatly influenced by soil layers and depths, and holes are easy to collapse in soft soil areas, so that expanded heads are difficult to form; the bottom-expanded cast-in-place pile is difficult to remove slag due to large thickness of the sediment at the pile end, and the bearing capacity and deformation are difficult to control.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is to provide a grouting bottom-expanding cast-in-place pile structure with waterproof canvas aiming at the prior art, which can solve the problems that the traditional construction process is complicated, the construction period is prolonged, and a special squeezing and expanding device is needed to replace a drill bit; the construction of the bottom-expanded cast-in-place pile is greatly influenced by soil layers and depths, and holes are easy to collapse in soft soil areas, so that expanded heads are difficult to form; the problems of difficult slag removal and difficult control of bearing capacity and deformation of the pedestal cast-in-place pile are solved due to the large thickness of the slag at the pile end.

The technical scheme adopted by the utility model for solving the problems is as follows: the utility model provides a take waterproof canvas slip casting to expand end bored concrete pile structure, it includes the stake hole, the downthehole pile body that is provided with of stake, the pile body includes steel reinforcement cage and concrete, the steel reinforcement cage is pour in the concrete, the pile body hypomere has waterproof canvas through two upper and lower reinforcing wire ligatures, it is provided with cement mortar to fill between waterproof canvas and the pile body.

Optionally, the steel reinforcement cage is including being many longitudinal reinforcement that the annular was arranged, and top-down interval is provided with multichannel stiffening hoop on many longitudinal reinforcement, and top-down still winds between many longitudinal reinforcement and has put the spiral hoop.

Optionally, the stiffening hoops are connected with the longitudinal steel bars in a welding mode.

Optionally, the spiral hoop is connected with the longitudinal steel bar in a welding manner.

Compared with the prior art, the utility model has the advantages that:

1. compared with the common cast-in-place pile, the pedestal cast-in-place pile can effectively shorten the length of the pile under the condition of providing the same bearing capacity;

2. the uplift bearing capacity of the pedestal cast-in-place pile is improved by about 1.5 times compared with that of the common cast-in-place pile under the condition of the same pile length, and the pedestal cast-in-place pile is not damaged;

3. compared with the common cast-in-place pile, the pedestal cast-in-place pile saves about 10 percent of construction cost.

Drawings

Fig. 1 is a schematic structural view of a conventional cast-in-place pile.

Fig. 2 is a schematic view of a conventional cast-in-place pile based on the installation of a tarpaulin and a bottom-expanding grouting apparatus.

Fig. 3 is a schematic view of the structure of the grouting and bottom-expanding bored concrete pile with the tarpaulin of the present invention.

Wherein:

pile hole 1

Pile body 2

Reinforcement cage 21

Longitudinal reinforcement bar 211

Stiffening hoop 212

Spiral hoop 213

Concrete 22

Reinforcing steel wire 3

Water-proof canvas 4

And (5) cement mortar.

Detailed Description

The utility model is described in further detail below with reference to the accompanying examples.

As shown in fig. 1 to 3, the under-reamed bored concrete pile structure with waterproof canvas grouting according to the present invention includes a pile hole 1, a pile body 2 is disposed in the pile hole 1, the pile body 2 includes a reinforcement cage 21 and concrete 22, the reinforcement cage 21 is poured in the concrete 22, a waterproof canvas 4 is bound to a lower section of the pile body 2 through an upper reinforcement steel wire 3 and a lower reinforcement steel wire 3, and cement mortar 5 is filled between the waterproof canvas 4 and the pile body 2;

the reinforcement cage 21 comprises a plurality of longitudinal reinforcements 211 which are annularly arranged, a plurality of stiffening hoops 212 are arranged on the longitudinal reinforcements 211 at intervals from top to bottom, and spiral hoops 213 are wound among the longitudinal reinforcements 211 from top to bottom;

the stiffening hoops 212 are connected with the longitudinal steel bars 211 in a welding mode;

the spiral hoop 213 is connected with the longitudinal steel bar 211 by welding.

A construction process of a bottom-expanding cast-in-place pile with waterproof canvas grouting comprises the following steps:

firstly, drilling a hole through a drilling pile machine to form a pile hole in an engineering site;

step two, installing waterproof canvas and a bottom expanding grouting device at the lower section of the manufactured reinforcement cage in a high-strength steel wire binding mode;

step three, putting a reinforcement cage with a waterproof canvas and a bottom expanding grouting device into the pile hole;

pouring concrete in the pile hole to form a pile body;

and step five, when the concrete is finally set in the step four, pile bottom grouting is started to form the club-footed pile, and the surrounding soil body is extruded to increase the bearing capacity.

In the fourth step, the final setting time of the concrete is about 24 hours;

grouting pressure in the fifth step is not more than 2.0MPa, and grouting amount is determined according to the size of the pile diameter and the length of the expanded base section;

grouting is mainly controlled by grouting amount, and grouting pressure is controlled as an auxiliary part; in order to prevent the damage of the waterproof canvas caused by overlarge pressure, grouting is carried out for three times, the grouting amount is 1/3 of the total grouting amount each time, the interval between the grouting amounts is 15-25 minutes, if the midway pressure reaches 1.5MPa, grouting is suspended, and grouting is carried out again after 15-20 minutes until the designed grouting amount ensures that the pressure grouting is finished.

In addition, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. The utility model provides a take canvas slip casting to expand end bored concrete pile structure which characterized in that: it includes stake hole (1), be provided with pile body (2) in stake hole (1), pile body (2) are including steel reinforcement cage (21) and concrete (22), steel reinforcement cage (21) are pour in concrete (22), pile body (2) hypomere has canvas (4) through two upper and lower reinforcing steel wires (3) ligatures, it is provided with cement mortar (5) to fill between canvas (4) and pile body (2).

2. The grouting and bottom-expanding bored concrete pile structure with the canvas for waterproofing according to claim 1, wherein: the reinforcement cage (21) is including being many longitudinal reinforcement (211) that the annular was arranged, and many longitudinal reinforcement (211) are gone up the top-down interval and are provided with multichannel stiffening hoop (212), and top-down still around having put spiral hoop (213) between many longitudinal reinforcement (211).

3. The grouting and bottom-expanding bored concrete pile structure with the canvas for waterproofing according to claim 2, wherein: the stiffening hoops (212) are connected with the longitudinal steel bars (211) in a welding mode.

4. The grouting and bottom-expanding bored concrete pile structure with the canvas for waterproofing according to claim 2, wherein: the spiral hoop (213) is connected with the longitudinal steel bar (211) in a welding mode.