CN-115874608-B - Bored pile adjacent to subway shield construction section and pile protection system construction method thereof

CN115874608BCN 115874608 BCN115874608 BCN 115874608BCN-115874608-B

Abstract

The invention provides a bored pile adjacent to a subway shield construction section and a pile protection system construction method thereof, the method comprises the steps of construction preparation, pile position lofting, high-pressure jet grouting pile construction, guide bracket fixing, pile protection steel pipe inserting and driving, slurry preparation and circulating system construction, drilling and pore forming, hole cleaning, reinforcement cage processing and mounting, sounding pipe mounting, conduit mounting, concrete pouring, bored pile detection and the like. The invention can play a role in damping the bored pile which is constructed and reduce extrusion force generated on the pile body due to shield construction.

Inventors

QIN GUOFENG
FAN XIAOYE
CHEN HAO
JIA ZHUANGZHUANG
QUAN YOUWEI
YAN WEIWEI
HE YI
PAN TAO

Assignees

中建八局第三建设有限公司

Dates

Publication Date: 20260505
Application Date: 20221202

Claims (6)

1. The method for constructing the bored pile and the pile protection system thereof close to the subway shield construction section is characterized by comprising the following steps: s1, construction preparation, namely surveying a construction site, leveling the site, and drawing a shield shell edge line of a shield machine; S2, setting out a pile position, namely setting out the pile foundation center of the bored pile, and determining the positions of pile protection points of the guide bracket, the axis of the high-pressure jet grouting pile and the center point of the pile protection steel pipe, wherein the centers of the bored pile, the guide bracket and the pile protection steel pipe are overlapped; s3, constructing a high-pressure jet grouting pile, namely inserting and driving a row of high-pressure jet grouting piles parallel to the subway shield construction direction at the middle position between the outer side wall of the shield machine and the outer side wall of the bored pile; S4, fixing a guide bracket, wherein the guide bracket comprises a groined bracket and a square bracket with the same inner diameter, the square bracket is placed on the groined bracket, the diagonal line of the square bracket is overlapped with two central lines of the groined bracket, the centers of the groined bracket and the square bracket are overlapped, after the placement position meets the requirement, the two brackets are welded in a full-welded mode, and 1 through hole is formed at each 4 crossing points of the groined bracket; S5, pile protection steel pipes are inserted, namely the centers of the pile protection steel pipes are aligned with the centers of the guide brackets, correction is carried out on the pile protection steel pipes in real time through the guide brackets in the insertion process, the pile protection steel pipes comprise inner side steel pipes and outer side steel pipes, the inner diameter of the inner side steel pipes is equal to the outer diameter of a bored pile, the inner diameter of the outer side steel pipes is larger than the outer diameter of the inner side steel pipes, the length of the outer side steel pipes is shorter than that of the inner side steel pipes, a damping interlayer is arranged between the inner side steel pipes and the outer side steel pipes, the damping interlayer is filled with natural rubber tightly, the tops of the damping interlayer are welded and sealed with the inner side steel pipes and the outer side steel pipes in a flush mode, and the bottoms of the damping interlayer are welded with the inner side steel pipes and the outer side steel pipes to form cutting edges; S6, preparing the slurry and constructing a circulating system of the slurry, namely reasonably arranging a slurry storage tank according to the situation of a site, arranging a slurry sedimentation tank beside the slurry storage tank, respectively connecting the pile-protecting steel pipe with the slurry storage tank and the slurry sedimentation tank through pipelines, supplementing fresh slurry into a hole by the slurry storage tank through a slurry pump in the drilling process, and returning the slurry in the hole back to the slurry storage tank through the pipelines after the slurry is settled in the slurry sedimentation tank during hole cleaning; S7, drilling and pore-forming, namely drilling after the drilling machine is installed in place, and checking the depth, the aperture and the inclination of the hole after the depth of the hole reaches the designed elevation; S8, processing and installing the reinforcement cage, namely after the reinforcement cage is manufactured, adopting an automobile crane for installing the framework, and ensuring that the framework is not deformed when being lifted; s9, installing a sound tube, namely installing the sound tube on the installed reinforcement cage; S10, installing the guide pipe and pouring concrete, namely installing the guide pipe in the installed steel reinforcement cage, and pouring the concrete: s11, detecting the bored pile, namely dismantling the guide bracket after construction is completed, and detecting the integrity of the bored pile.
2. The bored pile adjacent to the subway shield construction section and the construction method of the pile protection system thereof according to claim 1, wherein in the S4, an installation groove is excavated downwards at the pile protection point, a reinforcing steel bar is embedded in the installation groove, the reinforcing steel bar is higher than the ground, the reinforcing steel bar at the position higher than the ground is subjected to thread processing, four through holes of a guide bracket are aligned with the reinforcing steel bars at the four pile protection points, the guide bracket is placed in place, and after the center of the guide bracket coincides with the center of a pile protection steel pipe and the pile center of the bored pile, the guide bracket is screwed and fixed by nuts.
3. The bored pile adjacent to the subway shield construction section and the pile protection system construction method thereof according to claim 2, wherein in S4, the installation groove is provided in a convex shape.
4. The bored pile adjacent to the subway shield construction section and the pile protection system construction method thereof according to claim 1 or 2, wherein in S5, the pile protection steel pipe is constructed by adopting a full hydraulic vibrating hammer for sinking.
5. The bored pile adjacent to the subway shield construction section and the pile protection system construction method thereof according to claim 1 or 2, wherein in the S9, a clamp-press type acoustic pipe is adopted, an o-shaped rubber sealing ring is arranged in a U-shaped groove at the end part of the clamp-press type acoustic pipe, during installation, the socket end of the acoustic pipe is inserted into a bell end to a marking position, the U-shaped groove and one side part of the U-shaped groove are simultaneously extruded by a special hydraulic clamp, the sealing effect is achieved after the rubber sealing ring is extruded, and the pipe material of the socket end and the bell end of the clamp-press part simultaneously contracts and deforms to achieve the positioning and fixing effects, so that the connection of the acoustic pipe is effectively realized.
6. The bored pile adjacent to the subway shield construction section and the construction method of the pile protection system thereof according to claim 1 or 2, wherein in the S10, the guide pipe is a steel guide pipe with the diameter of 30cm, smooth and round inner wall and consistent inner diameter, the standard section length of the guide pipe is 2.5m, and the guide pipe length is adjusted by matching with 1.5m and 1m non-standard sections so as to meet the construction requirements of different hole depths, the bored pile concrete adopts pumping commodity concrete, the concrete proportion, slump and workability are strictly controlled in the construction, and the full-hole concrete is ensured to be poured before the initial setting of the first concrete.

Description

Bored pile adjacent to subway shield construction section and pile protection system construction method thereof Technical Field The invention relates to the technical field of bored piles, in particular to a bored pile adjacent to a subway shield construction section and a pile protection system construction method thereof. Background With the development of urban rail transit bridges, the construction of urban rail transit bridges is more and more, the requirements of engineering environment are more and more severe on construction constraint conditions, and particularly, the construction of structures such as pile foundations and main bodies adjacent to subway shield construction sections is complex in construction environment, high in difficulty and important how to minimize the influence on the structures such as finished pile foundations and main bodies during subway shield construction period. Disclosure of Invention Aiming at the prior art, the invention provides a bored pile adjacent to a subway shield construction section and a pile protection system construction method thereof. The invention provides a bored pile adjacent to a subway shield construction section and a pile protection system construction method thereof, which comprises the following steps: s1, construction preparation, namely surveying a construction site, leveling the site, and drawing a shield shell edge line of a shield machine; S2, setting out a pile position, namely setting out the pile foundation center of the bored pile, and determining the positions of pile protection points of the guide bracket, the axis of the high-pressure jet grouting pile and the center point of the pile protection steel pipe, wherein the centers of the bored pile, the guide bracket and the pile protection steel pipe are overlapped; s3, constructing a high-pressure jet grouting pile, namely inserting and driving a row of high-pressure jet grouting piles parallel to the subway shield construction direction at the middle position between the outer side wall of the shield machine and the outer side wall of the bored pile; S4, fixing a guide bracket, wherein the guide bracket comprises a groined bracket and a square bracket with the same inner diameter, the square bracket is placed on the groined bracket, the diagonal line of the square bracket is overlapped with two central lines of the groined bracket, the centers of the groined bracket and the square bracket are overlapped, after the placement position meets the requirement, the two brackets are welded in a full-welded mode, and 1 through hole is formed at each 4 crossing points of the groined bracket; s5, inserting and driving the pile protection steel pipe, namely aligning the center of the pile protection steel pipe with the center of a guide bracket, and correcting the pile protection steel pipe in real time through the guide bracket in the inserting and driving process; S6, preparing the slurry and constructing a circulating system of the slurry, namely reasonably arranging a slurry storage tank according to the situation of a site, arranging a slurry sedimentation tank beside the slurry storage tank, respectively connecting the pile-protecting steel pipe with the slurry storage tank and the slurry sedimentation tank through pipelines, supplementing fresh slurry into a hole by the slurry storage tank through a slurry pump in the drilling process, and returning the slurry in the hole back to the slurry storage tank through the pipelines after the slurry is settled in the slurry sedimentation tank during hole cleaning; S7, drilling and pore-forming, namely drilling after the drilling machine is installed in place, and checking the depth, the aperture and the inclination of the hole after the depth of the hole reaches the designed elevation; S8, processing and installing the reinforcement cage, namely after the reinforcement cage is manufactured, adopting an automobile crane for installing the framework, and ensuring that the framework is not deformed when being lifted; s9, installing a sound tube, namely installing the sound tube on the installed reinforcement cage; S10, installing the guide pipe and pouring concrete, namely installing the guide pipe in the installed steel reinforcement cage, and pouring the concrete: s11, detecting the bored pile, namely dismantling the guide bracket after construction is completed, and detecting the integrity of the bored pile. Preferably, in S4, a mounting groove is excavated downwards at the pile protection point, a steel bar is pre-buried in the mounting groove, the steel bar is higher than the ground, the steel bar at the position higher than the ground is threaded, four through holes of the guide bracket are aligned with the steel bars at the four pile protection points, the guide bracket is placed in place, and after the center of the guide bracket coincides with the center of the pile protection steel pipe and the pile center of the bored pile, the guide bra