阅读说明：本技术 一种既有地铁线取桩的方法 (Method for taking pile from existing subway line ) 是由 陈建林 郭李刚 史刚敏 卢燕华 王永峰 于 2021-09-02 设计创作，主要内容包括：本发明公开一种既有地铁线取桩的方法,包括以下步骤：顶管准备阶段,在顶管的待施工段的两端分别建造第一基坑和第二基坑,在所述第一基坑内设置顶管设备,所述顶管设备用于向待施工段进行顶管作业；顶管实施阶段,利用顶管设备从所述第一基坑的顶管位置开始,沿所述待施工段不断顶入工程管,破除盾构刀盘范围内的临时立柱与车站底板的传力路径,直至工程管达到所述第二基坑；盾构作业阶段,回填工程管,回填完毕后,使用盾构机进行盾构作业,盾构过程中对刀盘范围内的临时立柱和工程管进行盾构磨桩处理,贯通隧道。本发明技术提供了一种既有地铁线取桩的方法,能够在不破坏现有建筑物的情况下盾构穿越临时立柱。(The invention discloses a method for taking a pile from an existing subway line, which comprises the following steps: in the pipe jacking preparation stage, a first foundation pit and a second foundation pit are respectively built at two ends of a to-be-constructed section of a pipe jacking, pipe jacking equipment is arranged in the first foundation pit and is used for carrying out pipe jacking operation on the to-be-constructed section; in the pipe jacking implementation stage, pipe jacking equipment is utilized to continuously jack in the engineering pipe along the section to be constructed from the position of the pipe jacking of the first foundation pit, and a force transmission path between the temporary stand column and the station bottom plate in the range of the shield cutter head is broken until the engineering pipe reaches the second foundation pit; and in the shield operation stage, backfilling the engineering pipe, after backfilling is finished, performing shield operation by using a shield machine, and performing shield pile grinding treatment on the temporary stand column and the engineering pipe in the cutter head range in the shield process to penetrate through the tunnel. The invention provides a method for taking a pile from an existing subway line, which can lead a shield to pass through a temporary upright post without damaging the existing building.)

1. A method for taking a pile from an existing subway line is characterized by comprising the following steps:

in the pipe jacking preparation stage, a first foundation pit and a second foundation pit are respectively built at two ends of a to-be-constructed section of a pipe jacking, pipe jacking equipment is arranged in the first foundation pit and is used for carrying out pipe jacking operation on the to-be-constructed section;

in the pipe jacking implementation stage, pipe jacking equipment is utilized to continuously jack in the engineering pipe along the section to be constructed from the position of the pipe jacking of the first foundation pit, and a force transmission path between the temporary stand column and the station bottom plate in the range of the shield cutter head is broken until the engineering pipe reaches the second foundation pit;

and in the shield operation stage, backfilling the engineering pipe, after backfilling is finished, performing shield operation by using a shield machine, and performing shield pile grinding treatment on the temporary stand column and the engineering pipe in the cutter head range in the shield process to penetrate through the tunnel.

2. The method for taking piles from an existing subway line according to claim 1, wherein before the pipe jacking preparation stage, the method for taking piles from an existing subway line further comprises: and determining the position of the jacking pipe through a topographic map.

3. The method for taking the pile of the existing subway line as claimed in claim 2, wherein:

and after the first foundation pit and the second foundation pit are built, building a first enclosure wall in the first foundation pit, and building a second enclosure wall in the second foundation pit.

4. A method of existing subway line piling as claimed in claim 3, wherein: the pipe jacking equipment comprises a jacking system, a guide rail and a heading machine, wherein the heading machine is used for heading and breaking soil, the guide rail is used for guiding the engineering pipe, and the jacking system is used for pushing the engineering pipe to advance;

in the implementation stage of pipe jacking, firstly, the tunneling machine carries out ground breaking operation at the position of the pipe jacking, and the guide rail is laid along with the advance of the tunneling machine;

the guide rail and the jacking system are utilized to continuously jack the engineering pipe along with the ground breaking of the tunneling machine, and the tunneling machine breaks a force transmission path between the temporary stand column and a station floor in the range of the shield cutter head along with the continuous jacking of the engineering pipe;

and when the engineering pipe reaches the second foundation pit, finishing the pipe jacking implementation stage.

5. The method for taking the pile of the existing subway line as claimed in claim 4, wherein:

and in the jacking process of the engineering pipe, grouting reinforcement is carried out between the outer side of the engineering pipe and the soil body by using the grouting pipe on the outer side of the engineering pipe.

6. The method for taking the pile of the existing subway line as claimed in claim 4, wherein: be provided with interim support in the engineering pipe, interim support is used for preventing the engineering pipe collapse.

7. A method of existing subway line piling as claimed in claim 4, wherein said jacking system comprises:

the jack, the jack is connected with the jacking oil pump, the jacking oil pump is connected with the jacking hydro-cylinder.

8. A method of existing subway line piling as claimed in claim 4,

in shield operation, a foaming agent and bentonite slurry are injected into the peripheral soil body to improve the soil body, so that the torque borne by the cutter head is reduced, and the disturbance to the soil body is reduced.

9. The method for taking the pile of the existing subway line as claimed in claim 8, wherein:

before shield operation begins, a pile body settlement monitoring point and a displacement monitoring point are arranged at a shield construction section and used for monitoring the settlement condition of a pile body in a ground pile and after the ground pile.

10. The method for taking the pile of the existing subway line as claimed in claim 9, wherein: in the shield pile grinding construction, the pressure of a soil bin of a shield machine is controlled to be 0.10-0.14 MPa.

Technical Field

The invention relates to the technical field of building construction, in particular to a method for taking a pile from an existing subway line.

Background

In the urban rail transit construction process, a plurality of subway lines are gathered at the same subway station, the subway lines are usually built under the built subway lines due to regional planning and development, a plurality of temporary stand columns are built in the subway station construction process to assist in building and supporting a station bottom plate, after the subway station is built, the temporary stand columns cannot be dismantled for reducing workload, the temporary stand columns are usually required to be penetrated in the tunnel shield process of newly-planned subway lines, and the shield directly penetrates through the temporary stand columns to easily cause collapse or settlement of the existing building (the station bottom plate).

Disclosure of Invention

The invention mainly aims to provide a method for taking a pile from an existing subway line, and aims to solve the technical problem that in the prior art, a shield directly passes through a temporary stand column and easily damages an existing building.

In order to achieve the purpose, the invention provides a method for taking a pile from an existing subway line, which comprises the following steps:

in the pipe jacking preparation stage, a first foundation pit and a second foundation pit are respectively built at two ends of a to-be-constructed section of a pipe jacking, pipe jacking equipment is arranged in the first foundation pit and is used for carrying out pipe jacking operation on the to-be-constructed section;

in the pipe jacking implementation stage, pipe jacking equipment is utilized to continuously jack in the engineering pipe along the section to be constructed from the position of the pipe jacking of the first foundation pit, and a force transmission path between the temporary stand column and the station bottom plate in the range of the shield cutter head is broken until the engineering pipe reaches the second foundation pit;

and in the shield operation stage, backfilling the engineering pipe, after backfilling is finished, performing shield operation by using a shield machine, and performing shield pile grinding treatment on the temporary stand column and the engineering pipe in the cutter head range in the shield process to penetrate through the tunnel.

Optionally, before the pipe jacking preparation stage, the method for taking the pile from the existing subway line further includes:

and determining the position of the jacking pipe through a topographic map.

Optionally, after the first foundation pit and the second foundation pit are built, a first enclosure wall is built in the first foundation pit, and a second enclosure wall is built in the second foundation pit.

Optionally, the pipe jacking equipment comprises a jacking system, a guide rail and a heading machine, wherein the heading machine is used for heading and breaking soil, the guide rail is used for guiding the engineering pipe, and the jacking system is used for pushing the engineering pipe to advance;

in the implementation stage of pipe jacking, firstly, the tunneling machine carries out ground breaking operation at the position of the pipe jacking, and the guide rail is laid along with the advance of the tunneling machine;

the guide rail and the jacking system are utilized to continuously jack the engineering pipe along with the ground breaking of the tunneling machine, and the tunneling machine breaks a force transmission path between the temporary stand column and a station floor in the range of the shield cutter head along with the continuous jacking of the engineering pipe;

and when the engineering pipe reaches the second foundation pit, finishing the pipe jacking implementation stage.

Optionally, in the jacking process of the engineering pipe, grouting reinforcement is performed between the outer side of the engineering pipe and the soil body by using the grouting pipe on the outer side of the engineering pipe.

Optionally, a temporary support is arranged in the engineering pipe, and the temporary support is used for preventing the engineering pipe from collapsing.

Optionally, the jacking system comprises:

the jack, the jack is connected with the jacking oil pump, the jacking oil pump is connected with the jacking hydro-cylinder.

Optionally, in the shield operation, a foaming agent and bentonite slurry are injected into the surrounding soil to improve the soil, so that the torque borne by the cutter head is reduced, and the disturbance to the soil is reduced.

Optionally, before shield operation begins, a pile settlement monitoring point and a displacement monitoring point are arranged at a shield construction section, and the settlement monitoring point and the displacement monitoring point are used for monitoring settlement conditions of the pile in and after pile grinding.

Optionally, in the tunneling process, the pressure of the soil bin of the shield tunneling machine is controlled to be 0.10 Mpa-0.14 Mpa.

According to the technical scheme, the jacking pipe is used for breaking a force transmission path between the temporary stand column and a station floor in the range of the shield cutter head, plain concrete is backfilled in the jacking pipe to form a new force transmission path, after the backfilling of the plain concrete is finished, a shield machine is used for shielding, and shield pile grinding treatment is carried out on the residual temporary stand column and the engineering pipe in the shield tunnel, so that the collapse or settlement of the existing building caused by direct shield crossing is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic flow chart of an embodiment of the present invention;

FIG. 2 is a schematic diagram of a shield tunnel position structure according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of the position of a jacking pipe and the position of a temporary upright post jacking pipe before implementation of the invention;

FIG. 4 is a schematic structural diagram of the position of a pipe jacking and the position of a temporary upright post pipe jacking after the pipe jacking is implemented;

the reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Station	200	Temporary upright post
201	First foundation pit	202	Second foundation pit
				300	Shield tunnel	400	Shield tunnel

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

In urban rail transit construction, a plurality of subway lines are usually gathered at the same subway station, but due to regional development and planning, most of the subway lines gathered at the same subway station are not built at the same time, and a plurality of temporary stand columns are usually built below the station during the construction of the subway station and are used for temporarily supporting the station during the construction of the subway station, so that when the constructed subway station is built again, the temporary stand columns during the construction of the station can often invade with a newly-built subway line tunnel, and if a shield directly passes through the temporary stand columns during the construction of the new subway line, the existing building is easy to collapse or subside.

In order to solve the problems, the invention provides a method for taking piles of an existing subway line, which is used for taking piles of temporary stand columns intruding into tunnels in subway line construction. .

As shown in fig. 1-4, the method of the present embodiment includes the following steps:

s20, in a pipe jacking preparation stage, a first foundation pit 201 and a second foundation pit 202 are respectively built at two ends of a to-be-constructed section of a pipe jacking, pipe jacking equipment is arranged in the first foundation pit 201, and the pipe jacking equipment is used for carrying out pipe jacking operation on the to-be-constructed section;

s40, in the pipe jacking implementation stage, pipe jacking equipment jacks an engineering pipe continuously along the to-be-constructed section from the position of the pipe jacking of the first foundation pit, and a force transmission path between the temporary upright column 200 and the station bottom plate 100 in the range of the shield cutter head is broken until the engineering pipe which is jacked for the first time reaches the second foundation pit 202;

and S60, backfilling the engineering pipe in the shield operation stage, performing shield operation by using a shield machine after backfilling, and performing shield pile grinding treatment on the temporary stand column 200 and the engineering pipe in the cutter head range in the shield process to penetrate through the tunnel.

It should be noted that: the setting directions of the first foundation pit 201 and the second foundation pit 202 are parallel to the temporary upright posts 200, the pipe jacking direction is perpendicular to the first foundation pit 201 and the second foundation pit 202, and the first foundation pit 201 is used for lowering pipe jacking equipment and serves as a starting point of pipe jacking operation.

It should be noted that: in the implementation stage of the jacking pipe, the jacking equipment continuously and sequentially jacks engineering pipes with the same specification along with continuous tunneling of the tunneling equipment, in the jacking process of the engineering pipes, waste soil and the like in the tunneling process are conveyed out of the engineering pipes by manpower or machinery, when the engineering pipes which are jacked for the first time contact the temporary stand columns, the temporary stand column parts in the engineering pipes are broken by adopting a mechanical or manual mode, namely, a force transmission path between the bottom of a station and the temporary stand columns is broken, the phenomenon that the force transmission path is suddenly broken in a tunnel shield to cause collapse and settlement of the existing building is prevented, and after the temporary stand columns in the cutter head range are broken, the engineering pipes continue to be jacked until the engineering pipes which are jacked for the first time reach the second foundation pit 202.

It should be noted that: in the shield construction operation stage, the engineering pipe in the pipe jacking process is backfilled by using plain concrete before the shield construction, the plain concrete is backfilled to enable the engineering pipe and the surrounding soil body to form an integral structure, the shield construction machine is used for starting shield construction and excavation of the tunnel after backfilling is finished, in the shield construction process, the rotating speed change of the cutter head is controlled, the engineering pipe is predicted to be subjected to pile grinding treatment on residual temporary stand columns in the range of the cutter head, and the shield construction pile grinding cannot influence a station because the invasion parts of the temporary stand columns in the tunnel and the floor of the station do not have a force transmission path.

As an optional implementation manner, before the pipe jacking preparation stage, the method for taking the pile from the existing subway line further includes: and before the pipe jacking stage, determining the position of the pipe jacking through a topographic map.

It should be noted that: and determining the position of the jacking pipe, wherein the position comprises the stratum depth position of the jacking pipe operation, the starting position of the jacking pipe construction and the end position of the jacking pipe construction.

As an optional implementation manner, after the first foundation pit and the second foundation pit are built, a first enclosure wall is built in the first foundation pit, and a second enclosure wall is built in the second foundation pit.

It should be noted that: a first enclosure wall for reinforcing the first foundation pit is arranged in the first foundation pit, and a second enclosure wall for reinforcing the second foundation pit is arranged in the second foundation pit; the first maintenance wall is arranged on the inner wall of the first foundation pit, and the second maintenance wall is arranged on the inner wall of the second foundation pit.

As an alternative embodiment: the pipe jacking equipment comprises a jacking system, a guide rail and a heading machine, wherein the heading machine is used for heading and breaking soil, the guide rail is used for guiding the engineering pipe, and the jacking system is used for pushing the engineering pipe to advance;

in the implementation stage of pipe jacking, the tunneling machine carries out ground breaking operation at the position of the pipe jacking, and the guide rail is laid along with the forward movement of the tunneling machine;

the guide rail and the jacking system are utilized to continuously jack the engineering pipe along with the ground breaking of the tunneling machine, and the tunneling machine breaks a force transmission path between the temporary stand column and a station floor in the range of the shield cutter head along with the continuous jacking of the engineering pipe;

and when the engineering pipe reaches the second foundation pit, finishing the pipe jacking implementation stage.

It should be noted that: the first foundation pit and the second foundation pit are excavated by adopting an excavator, and after the excavation is completed to the preset depth, the inner walls around the first foundation pit and the second foundation pit are piled with concrete to form a retaining wall, so that the foundation pits are prevented from collapsing in the pipe jacking process.

It should be noted that: the engineering pipe is arranged behind the tunneling machine and is pushed to advance along with the tunneling advancing jacking system.

It should be noted that: the heading machine is arranged at the depth of pipe jacking operation through the foundation pit, a guide rail is laid behind the pipe jacking along with the advancing of the pipe jacking, the engineering pipe advances along the laid guide rail along with the heading machine under the jacking action of the jacking system, and when the heading machine breaks away a force transmission path between a temporary upright post and a station floor within the range of a shield cutter head, the engineering pipe jacks along with the guide rail, the original force transmission path is gradually replaced, and the phenomenon that the upper building collapses or subsides due to the change of the force transmission path is prevented.

As an alternative to the above-described embodiment,

and in the jacking process of the engineering pipe, grouting reinforcement is performed between the outer side of the engineering pipe and the soil body by using the grouting pipe on the outer side of the engineering pipe.

It should be noted that: when a plurality of engineering pipes are continuously pushed in along with the tunneling machine, the outer side of each engineering pipe is provided with a grouting pipe for grouting reinforcement between the outer side of the engineering pipe and a soil body, and the tunneling tunnel is prevented from collapsing.

As an optional embodiment, a temporary support is arranged in the engineering pipe, and the temporary support is used for preventing the engineering pipe from collapsing.

It should be noted that: the temporary support can adopt a steel frame and a steel plate, the steel plate is arranged on the steel plate, the upper pipe wall of the engineering pipe is supported, and the engineering pipe is prevented from collapsing due to collapse of a soil body above the engineering pipe.

As an optional implementation mode, the jacking system comprises a jack, the jack is connected with a jacking oil pump, and the jacking oil pump is connected with a jacking oil cylinder.

It should be noted that: the jacking oil pump is used for driving the jack to jack in and contract, and the jacking oil cylinder provides oil pressure for the jacking oil pump.

As an optional implementation mode, in the shield operation, a foaming agent and bentonite slurry are injected into the surrounding soil to improve the soil, so that the torque borne by a cutter head is reduced, and the disturbance to the soil is reduced:

it should be noted that: and after the pipe jacking operation is finished, backfilling the engineering pipe by using plain concrete, after the backfilling construction is finished, performing shield ground pile construction on a shield construction section, and filling lubricants such as foaming agents and bentonite slurry into peripheral soil bodies in the shield ground pile construction to improve the soil bodies, reduce the torque borne by a cutter head and reduce the disturbance to the soil bodies.

As an optional implementation manner, before the shield operation starts, a pile body settlement monitoring point and a displacement monitoring point are arranged at the shield construction section, and the settlement monitoring point and the displacement monitoring point are used for monitoring the settlement condition of the pile body in the pile grinding process and after the pile grinding process.

As an optional embodiment, the pressure of the soil bin of the shield tunneling machine is controlled to be 0.12 MPa-0.14 MPa during tunneling.

It should be noted that: the settlement monitoring point and the displacement monitoring point which are arranged at the position of the temporary stand column monitor the change of the temporary stand column in real time so as to timely make corresponding treatment and prevent the shield from causing influence on the existing building in the pile grinding process.

As an optional implementation manner, as shown in fig. 1 to 4, when a plurality of temporary columns intrude into the tunnel, pipe jacking operation is performed at the intersection of the temporary columns and the shield cutterhead to replace the original force transmission path, and then pile grinding processing is performed on the remaining temporary columns or the engineering pipe portion in the range of the shield cutterhead.

The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.