CN-122013779-A - Pile side distributed grouting construction method for occluding piles

CN122013779ACN 122013779 ACN122013779 ACN 122013779ACN-122013779-A

Abstract

The invention relates to the technical field of building construction, in particular to a construction method for distributed grouting of a pile side of a secant pile, which comprises the following steps of lowering a B pile reinforcement cage fixed with a grouting head into a B pile casting hole to be cast, casting B pile concrete, respectively connecting two grouting core pipes with grouting pumps through grouting pipes, respectively putting the two grouting core pipes with grouting plugs into the bottoms of two groups of sounding pipes by lifting equipment, sealing the sounding pipes by using an expansion grouting plug, grouting cement paste with a required design amount into the grouting head of the pile end of the B pile by the grouting pumps, stopping grouting when the grouting condition is finished, contracting the grouting plug, lifting the grouting plug upwards to the position of the pile side grouting head adjacent to the upper part of the grouting head, sealing the grouting pipe by using the expansion grouting plug, and grouting the grouting pump to the grouting head of the pile side of the B pile by a required design amount of cement paste when the grouting condition is finished, and stopping grouting.

Inventors

HUANG KEQI
HUANG GUIYUAN
LUO YUANYUAN
CAO HAIQING
WU HONGWEN
XU LIYANG
LIU XIAOMIN
WEN SHENG
HUANG XIN
YANG LIANGJUN

Assignees

中国建筑第六工程局有限公司
中建桥梁有限公司
南京东土建设科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260228

Claims (10)

1. The pile side distributed grouting construction method of the engaged pile is characterized by comprising the following steps of: Binding a B pile reinforcement cage of a snap pile, respectively arranging two grouting heads at the bottom ends of the front side and the rear side of the B pile reinforcement cage, arranging a plurality of grouting heads on the side walls of the front side and the rear side of the B pile reinforcement cage from bottom to top according to a designed interval, connecting the plurality of grouting heads of the front side wall of the B pile reinforcement cage and one grouting head at the bottom end of the front side of the B pile reinforcement cage in series by using one group of sound measuring pipes, and connecting the plurality of grouting heads of the rear side wall of the B pile reinforcement cage and one grouting head at the bottom end of the rear side of the B pile reinforcement cage in series by using the other group of sound measuring pipes; drilling two adjacent A pile pouring holes with specified depth through a sleeve drilling machine, and pouring A pile concrete into the two adjacent A pile pouring holes respectively to form two adjacent A piles; Drilling a B pile pouring hole with a designated depth between two adjacent A piles through a sleeve drilling machine, and cutting off the intersecting part of the two adjacent A piles and the B piles to be poured between the two A piles; Step four, a B pile reinforcement cage fixed with a grouting head is lowered into a B pile pouring hole to be poured; Pouring B pile concrete, and respectively placing two grouting core pipes with grouting plugs to the bottoms of two groups of sounding pipes by lifting equipment after the integrity of the pile body of the B pile is qualified and the strength of the B pile body concrete reaches 75%; step six, after the expansion grouting stop plug seals the sound measuring pipe, grouting cement paste with the design requirement amount is injected into a grouting head at the pile end of the pile B by a grouting pump, and grouting is stopped when grouting stopping conditions are met; step seven, contracting the grouting stop, lifting the grouting stop upwards to a position adjacent to the pile side grouting head above the grouting stop, sealing the sounding pipe by the expansion grouting stop, grouting cement slurry with a design required amount into the grouting head at the pile side of the pile B by a grouting pump, and terminating grouting when grouting termination conditions are met; step eight, repeating the step seven until the injection of the cement paste on the residual pile side of the single pile B is completed; And step nine, completing construction work of the rest pile bodies of the secant piles according to the sequence of constructing the A piles and then constructing the B piles on the two A pile foundations completed in the step two according to the construction path of the secant piles, and completing distributed post grouting construction of the secant piles according to the steps three to eight when each B pile is constructed.
2. The method for pile-side distributed grouting construction of the secant pile according to claim 1, wherein the method comprises the following steps: and two groups of sounding pipes in the first step are fixedly connected to the inner side of the B pile reinforcement cage in a reinforcing steel bar binding or welding mode respectively.
3. The method for pile-side distributed grouting construction of the secant pile according to claim 1, wherein the method comprises the following steps: and the bottom end and the outer side wall of the pile B reinforcement cage are respectively welded with protection reinforcing steel bars for protecting the grouting heads.
4. The method for pile-side distributed grouting construction of the secant pile according to claim 1, wherein the method comprises the following steps: and in the first step, the number of the B pile reinforcement cages for binding the engaged piles corresponds to the number of the B piles in the engaged piles to be constructed.
5. The method of distributed grouting construction of a pile side of a secant pile according to claim 1, wherein the primary cleaning is carried out after the hole drilling of the casting hole of the pile B is completed, and the secondary cleaning is carried out after the lowering of the reinforcement cage of the pile B is completed.
6. The method for constructing the distributed grouting on the pile side of the occluding pile according to claim 1, wherein the type of each grouting stop is ZF-A51, two grouting stops are respectively arranged at intervals at the lower part of each grouting core pipe, grouting holes are formed between the two grouting stops in each grouting core pipe, a plurality of grouting outlets are formed in the bottom end of each group of sounding pipes according to the designed interval, a grouting head is communicated with the outer side of each grouting outlet, one grouting stop at the upper part of each grouting core pipe expands when grouting is conducted to the grouting head of the pile end of the pile B, one grouting stop at the lower part does not work, and two grouting stops on each grouting core pipe expand when grouting is conducted to the grouting head of the pile end of the pile B.
7. The distributed grouting construction method for the pile side of the secant pile according to claim 1, wherein after the pile reinforcement cage of the pile B is placed, clear water is filled into each group of sound measuring pipes, the tightness of connection between the sound measuring pipes and a grouting head is detected, if water leakage occurs, water leakage positions are repaired, the top ends of the sound measuring pipes are vertically exposed out of the ground by 200-500 mm and are welded and fixed by positioning ribs, and the top pipe openings of the sound measuring pipes are sealed after the clear water is filled into each group of sound measuring pipes.
8. The distributed grouting construction method for the pile side of the secant pile according to claim 1, wherein grouting pressure is 0.8-4.0 mpa when grouting pump presses grouting slurry to a grouting head of the pile end of the pile B, and grouting pressure is 0.2-2.0 mpa when grouting pump presses grouting slurry to a grouting head of the pile side of the pile B.
9. The method for pile-side distributed grouting construction of the secant pile according to claim 1, wherein the method comprises the following steps: The grouting amount design requirement of each grouting end face of the single pile end B is required to meet the grouting amount formula of the pile end: ; the grouting quantity design requirement of each grouting end face of the single pile side B needs to meet the calculation formula of the pile side grouting quantity: ; the design requirement of single pile grouting amount of B needs to meet the single pile grouting amount calculation formula: ; wherein: representing the empirical coefficient of the lateral pressure slurry quantity of the pile B; Representing the empirical coefficient of the pile end grouting amount of the pile B; Representing the number of the side pressing slurry end faces of the pile B; Representing the pile diameter of the pile B; Representing the grouting amount of a single pile B; representing the grouting amount of each grouting end face of a single pile end B; Representing the grouting amount of each grouting end face of the single pile side of the B pile.
10. The method for constructing the pile-side distributed grouting of the secant pile according to claim 9, wherein the grouting termination condition is as follows: The grouting amount reaches the design requirement, and the grouting average pressure of the last 5min reaches the grouting termination pressure; the second condition is that the grouting amount reaches the design requirement, the average grouting pressure of the last 5min is not less than 0.8 times of the grouting end pressure, and the grouting amount of the layer is increased to 110% of the design value; The third condition is that the grouting amount reaches the design requirement, the average grouting pressure of the last 5min is less than 0.8 times of the grouting end pressure, and the grouting amount of the layer is increased to 120% of the design value; And fourthly, the grouting amount is larger than 80% of the design value, and the grouting average pressure of the last 5min is larger than 1.2 times of the grouting end pressure.

Description

Pile side distributed grouting construction method for occluding piles Technical Field The invention relates to the technical field of building construction, in particular to a pile side distributed grouting construction method for a secant pile. Background The meshed piles are embedded in part of the circumference between adjacent concrete row piles, and steel reinforcement cages are input into piles constructed in the follow-up sequence in an opposite way to form an integral continuous waterproof and soil-retaining enclosure structure with good seepage prevention effect, and the meshed piles are arranged in a mode of not reinforcing bars and adopting super retarding plain concrete piles (A piles) and reinforced concrete piles (B piles) to be arranged at intervals. During construction, the pile A is firstly constructed, then the pile B is constructed, and the construction of the pile B is completed before the concrete of the pile A is initially set. And the pile A and the pile B are constructed by adopting a full sleeve drilling machine, and concrete at the intersection part of the adjacent pile A is cut off during the drilling construction of the pile B, so that occlusion is realized. The occluding pile is used as a form of the underground diaphragm wall, and has increasingly application in large bridge foundation engineering due to the excellent water stopping performance and high hole collapse preventing capability; the construction of the interlocking pile often adopts a slurry wall protection process, and the inherent defect of the slurry wall protection is that sediment is generated at the pile end, mud is generated at the pile side, so that the bearing capacity and the deformation resistance of the interlocking pile are weakened, meanwhile, as the interlocking pile is formed by mutually interlocking a circular pile A and a circular pile B, the bearing capacity and the deformation resistance of a wall body are not higher than those of a traditional trough section type underground diaphragm wall, and the bearing capacity and the deformation resistance of a large bridge foundation are often required to be higher for the underground diaphragm wall, but no effective method for improving the bearing capacity and the deformation resistance of the interlocking pile exists at present. Disclosure of Invention The invention aims to provide a pile side distributed grouting construction method for a secant pile, which aims to solve the technical problems in the background technology. In order to achieve the above purpose, the technical scheme of the invention is as follows: a pile side distributed grouting construction method of a secant pile comprises the following steps: Binding a B pile reinforcement cage of a snap pile, respectively arranging two grouting heads at the bottom ends of the front side and the rear side of the B pile reinforcement cage, arranging a plurality of grouting heads on the side walls of the front side and the rear side of the B pile reinforcement cage from bottom to top according to a designed interval, connecting the plurality of grouting heads of the front side wall of the B pile reinforcement cage and one grouting head at the bottom end of the front side of the B pile reinforcement cage in series by using one group of sound measuring pipes, and connecting the plurality of grouting heads of the rear side wall of the B pile reinforcement cage and one grouting head at the bottom end of the rear side of the B pile reinforcement cage in series by using the other group of sound measuring pipes; drilling two adjacent A pile pouring holes with specified depth through a sleeve drilling machine, and pouring A pile concrete into the two adjacent A pile pouring holes respectively to form two adjacent A piles; Drilling a B pile pouring hole with a designated depth between two adjacent A piles through a sleeve drilling machine, and cutting off the intersecting part of the two adjacent A piles and the B piles to be poured between the two A piles; Step four, a B pile reinforcement cage fixed with a grouting head is lowered into a B pile pouring hole to be poured; Pouring B pile concrete, and respectively placing two grouting core pipes with grouting plugs to the bottoms of two groups of sounding pipes by lifting equipment after the integrity of the pile body of the B pile is qualified and the strength of the B pile body concrete reaches 75%; step six, after the expansion grouting stop plug seals the sound measuring pipe, grouting cement paste with the design requirement amount is injected into a grouting head at the pile end of the pile B by a grouting pump, and grouting is stopped when grouting stopping conditions are met; step seven, contracting the grouting stop, lifting the grouting stop upwards to a position adjacent to the pile side grouting head above the grouting stop, sealing the sounding pipe by the expansion grouting stop, grouting cement slurry with a design required amount into the grou