CN113153384A - Construction method for deep-buried subway station under rock geology - Google Patents

Construction method for deep-buried subway station under rock geology Download PDF

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Publication number
CN113153384A
CN113153384A CN202110314801.5A CN202110314801A CN113153384A CN 113153384 A CN113153384 A CN 113153384A CN 202110314801 A CN202110314801 A CN 202110314801A CN 113153384 A CN113153384 A CN 113153384A
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CN
China
Prior art keywords
station
layer
construction
excavating
rock soil
Prior art date
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Pending
Application number
CN202110314801.5A
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Chinese (zh)
Inventor
卢冠楠
陈松洲
鲜正洪
李玲玉
黄灿
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Road and Bridge International Co Ltd
China Communication South Road and Bridge Co Ltd
Original Assignee
Road and Bridge International Co Ltd
China Communication South Road and Bridge Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Road and Bridge International Co Ltd, China Communication South Road and Bridge Co Ltd filed Critical Road and Bridge International Co Ltd
Priority to CN202110314801.5A priority Critical patent/CN113153384A/en
Publication of CN113153384A publication Critical patent/CN113153384A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D13/00Large underground chambers; Methods or apparatus for making them
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/10Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/10Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
    • E21D11/105Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete

Abstract

The invention relates to a construction method of a deep-buried subway station under rock geology, which comprises the steps of firstly constructing fender posts on the ground by adopting a rotary drilling rig according to the peripheral contour line of the station, and taking the fender posts as primary supports of the station; constructing a row of latticed columns along the longitudinal center line of the station, and reducing the span of the station by half; adopting rotary drilling to drill a plurality of slag taking holes in a honeycomb shape on the ground within the plane range of the subway station, and taking out most rock soil within the excavation range of the station; and then carrying out underground excavation construction on the station rock soil by adopting a reverse construction method. The invention can avoid the problems of low efficiency and large risk of the lower small-section independent closed loop excavation, has high construction safety and construction efficiency, good effects of controlling the deformation of the surrounding soil body and the surface settlement, can reduce the supporting amount of the supporting structure and reduce the construction cost.

Description

Construction method for deep-buried subway station under rock geology
Technical Field
The invention belongs to the technical field of subway tunnel construction, and relates to an excavation construction method of a deep-buried large-section subway station under rock geology.
Background
The excavation section of the subway station is large, the open excavation method can be adopted for construction of a shallow station, the open excavation method is too large for a deep station or a station with a complex surrounding environment, and the underground excavation construction such as a double-side-wall pit guiding method and a CRD method is generally adopted. The principle of the method is that a large section is divided into a plurality of small sections, each small section is independently closed into a ring for excavation and supporting, the construction process is complicated, the efficiency is low, a supporting system is easy to damage in the construction process to cause primary support instability, especially in rock geology, blasting construction needs to be adopted in the excavation process, the blasting operation greatly disturbs surrounding rock masses, and the double-side-wall pit guiding method and the CRD method are difficult to ensure the integrity of the rock masses at the arch foot of the supporting structure, so that great construction risks and potential safety hazards are caused.
Disclosure of Invention
The invention aims to solve the problems and provides a construction method suitable for a deep-buried subway station under rock geology, which simplifies the process, improves the construction efficiency and reduces the construction risk.
The technical scheme of the invention is as follows:
a construction method for a deep-buried subway station under rock geology is characterized by comprising the following steps:
(1) constructing a circle of fender piles on the ground along the periphery of the plane outline of the subway station, and constructing a row of lattice columns along the longitudinal center line of the station; the lower ends of the enclosure piles and the lattice columns are at least 2m below the elevation of the bottom of the station, a reinforcement cage is arranged below the interior of the enclosure piles, concrete is poured to the top of the pile, the reinforcement cage is placed below the interior of the lattice columns, and the concrete is poured to the elevation of the top of the station;
(2) in the plane range of the subway station, a plurality of slag taking holes are drilled on the ground in a honeycomb shape by adopting rotary drilling, and the depth of each slag taking hole reaches the bottom elevation of the subway station;
(3) according to station layering, adopting a reverse construction method to carry out station underground excavation construction:
(31) constructing the upper layer of the station: firstly, excavating rock soil on two sides of an upper layer, and pouring two side walls of the upper layer; excavating part of rock soil of the vault, pouring the vault, and backfilling a slag taking hole above the closed vault after the vault is poured; excavating upper-layer cavern rock soil, arranging temporary supports between two side walls after the excavation of the upper-layer cavern rock soil is finished, pouring an upper-layer partition plate of a construction station, and removing the temporary supports;
(32) construction of a middle layer of a station: excavating rock soil on two sides of the middle layer, and pouring two side walls of the middle layer; then excavating middle-layer cavern rock soil; after the rock soil excavation of the middle-layer cavern is finished, arranging a temporary support between the two middle-layer side walls, then pouring a construction station middle-layer partition plate, and dismantling the temporary support;
(33) and (3) constructing the lower layer of the station: excavating rock soil on two sides of the lower layer, and pouring two side walls of the lower layer; then excavating the rock soil of the lower-layer cavern; after the excavation of the rock soil of the lower-layer cavern is finished, a temporary support is arranged between the two lower-layer side walls, then a construction station bottom plate is poured, and the temporary support is detached.
Compared with the existing underground excavation construction methods such as a double-side-wall pit guiding method, a CRD method and the like, the invention has the following advantages:
(1) most rock masses in the main body position of the station are taken out through rotary drilling and drilling on the ground, so that the underground excavation workload of the rock masses is greatly reduced. The ground construction speed is fast, and is efficient.
(2) The rotary drilling rig is in a honeycomb shape for slag taking, the honeycomb shape has good mechanical property in the horizontal direction, and the honeycomb rock-soil structure and the outer contour fender post in the station main body are stressed together, so that the stability of the surrounding rock-soil body in the construction process can be ensured.
(3) After most of the rock mass of the main body of the station is drilled into a honeycomb structure, the difficulty of rock mass excavation is greatly reduced, and the disturbance of blasting to surrounding rock mass and environment can be effectively reduced when blasting construction is adopted.
(4) The lattice column halves the station span, and when the cavern is excavated, the construction degree of difficulty and safety risk can be reduced.
(5) The station main part adopts reverse construction, and the permanent structure of station is as the inside support of work progress, reducible supporting construction's support volume, and control surrounding soil body deformation and earth's surface subside are effectual.
Drawings
FIG. 1 is a flow chart of the construction of the present invention;
FIG. 2 is a plan view of the arrangement of fender posts and lattice columns and earth boring holes;
FIG. 3 is an elevation view of the arrangement of fender posts and lattice columns and earth-borrowing boreholes;
fig. 4 is a cross-sectional structural view of a station;
FIG. 5 is a schematic view of a station upper side wall after pouring is completed;
FIG. 6 is a schematic diagram of a state after the pouring of the station vault is completed;
FIG. 7 is a schematic view of a temporary support structure between upper sidewalls;
FIG. 8 is a schematic view of the upper layer partition after pouring is completed;
FIG. 9 is a schematic view of the middle side wall and the temporary support after the construction is completed;
FIG. 10 is a schematic view of the middle layer of the partition after pouring;
FIG. 11 is a schematic view of the lower sidewall and the temporary support after the construction is completed;
fig. 12 is a schematic view of a state after pouring of the station floor is completed.
Detailed Description
The construction method of the present invention is explained below by a specific embodiment, in which a subway station is a transfer station and is divided into upper, middle and lower 3 floors.
FIG. 1 is a construction flow chart of the present invention, and the specific construction steps are as follows:
(1) as shown in fig. 2 and 3, firstly, a circle of fender posts 2 are constructed on the ground along the periphery of a plane contour 1 of a subway station, and a row of lattice columns 3 are constructed along the longitudinal center line of the station; and (3) excavating the fender post and the lattice column by adopting a rotary drilling rig, excavating the lower ends of the fender post 2 and the lattice column 3 to at least 2m below the elevation of the bottom of the station, lowering a reinforcement cage after pore-forming, and pouring concrete. The fender post is used as the primary support of the station main body, and concrete is poured to the top of the post; pouring concrete in the lattice column to the elevation of the top of the station; the lattice column divides the station into two areas longitudinally, so that the span of the station is halved.
(2) In the plane range of the subway station, a plurality of slag taking holes 4 are drilled in a honeycomb mode on the ground by adopting a rotary drilling rig, the depth of each slag taking hole 4 reaches the elevation of the bottom of the subway station, and most rock soil in the station excavation range is taken out through the slag taking holes.
The spacing of the fender post 2 is generally set to be 2-2.5m, the spacing of the lattice column 3 is 5-6m, and the spacing of the slag taking holes 4 is 0.8-1 times of the hole pitch.
As shown in fig. 4, the station is divided into 3 layers, and the main structure includes a vault 5, an upper layer side wall 6, an upper layer partition 7, a middle layer side wall 8, a middle layer partition 9, a lower layer side wall 10, and a bottom plate 11. The fender post 2 is used as a primary support of the station, and the latticed column 3 divides the station into a left area and a right area.
(3) According to station layering, adopting a reverse construction method to carry out station underground excavation construction from top to bottom, and the concrete flow is as follows:
(31) firstly, carrying out upper layer construction of a station: as shown in fig. 5, firstly excavating rock soil on two sides of the upper layer, and pouring an upper layer side wall 6;
as shown in fig. 6, after the upper layer side wall 6 is poured, excavating part of rock soil of the vault and pouring the vault 5; after the vault 5 is poured, backfilling and sealing a slag taking hole above the vault;
as shown in fig. 7, after the vault 5 is poured, excavating upper-layer cavern rock soil; after the excavation of upper strata cavern ground is accomplished, set up interim support 12 between both sides wall, prevent that the side wall from inwards warping after the excavation of cavern ground.
As shown in fig. 8, the upper-layer partition 7 of the station is cast and then the temporary support is removed.
(32) Carrying out middle layer construction of the station: as shown in fig. 9, excavating rock soil on two sides of the middle layer, and pouring the side wall 8 of the middle layer; then excavating middle-layer cavern rock soil, and arranging a temporary support 12 between two middle-layer side walls after the excavation of the upper-layer cavern rock soil is finished; then, as shown in fig. 10, the middle layer partition 9 of the station is poured and constructed, and the temporary support is removed.
(33) And finally, constructing the lower layer of the station: as shown in fig. 11, excavating rock soil on two sides of the lower layer, and pouring the lower layer side wall 10; secondly, excavating lower-layer cavern rock soil, and arranging a temporary support 12 between two lower-layer side walls after the lower-layer cavern rock soil is excavated; then, as shown in fig. 12, the station floor 11 is cast and the temporary support is removed.
The lattice column longitudinally divides a station into two areas, when each layer of cavern rock soil is excavated, one side of the lattice column is excavated firstly, the other side of the lattice column is excavated, and the transverse span is halved when the cavern is excavated, so that the construction safety can be ensured; and excavating the rock soil by adopting a step method and circularly excavating.

Claims (3)

1. A construction method for a deep-buried subway station under rock geology is characterized by comprising the following steps:
(1) constructing a circle of fender piles on the ground along the periphery of the plane outline of the subway station, and constructing a row of lattice columns along the longitudinal center line of the station; the lower ends of the enclosure piles and the lattice columns are at least 2m below the elevation of the bottom of the station, a reinforcement cage is arranged below the interior of the enclosure piles, concrete is poured to the top of the pile, the reinforcement cage is placed below the interior of the lattice columns, and the concrete is poured to the elevation of the top of the station;
(2) in the plane range of the subway station, a plurality of slag taking holes are drilled on the ground in a honeycomb shape by adopting rotary drilling, and the depth of each slag taking hole reaches the bottom elevation of the subway station;
(3) according to station layering, adopting a reverse construction method to carry out station underground excavation construction:
(31) constructing the upper layer of the station: firstly, excavating rock soil on two sides of an upper layer, and pouring two side walls of the upper layer; excavating part of rock soil of the vault, pouring the vault, and backfilling a slag taking hole above the closed vault after the vault is poured; excavating upper-layer cavern rock soil, arranging temporary supports between two side walls after the excavation of the upper-layer cavern rock soil is finished, pouring an upper-layer partition plate of a construction station, and removing the temporary supports;
(32) construction of a middle layer of a station: excavating rock soil on two sides of the middle layer, and pouring two side walls of the middle layer; then excavating middle-layer cavern rock soil; after the rock soil excavation of the middle-layer cavern is finished, arranging a temporary support between the two middle-layer side walls, then pouring a construction station middle-layer partition plate, and dismantling the temporary support;
(33) and (3) constructing the lower layer of the station: excavating rock soil on two sides of the lower layer, and pouring two side walls of the lower layer; then excavating the rock soil of the lower-layer cavern; after the excavation of the rock soil of the lower-layer cavern is finished, a temporary support is arranged between the two lower-layer side walls, then a construction station bottom plate is poured, and the temporary support is detached.
2. The method for constructing a deep buried subway station under rock geology according to claim 1, characterized in that: the spacing of the guard piles is 2-2.5m, the spacing of the lattice columns is 5-6m, and the spacing of the drilled holes is 0.8-1 time of the aperture.
3. The method for constructing a deep buried subway station under rock geology according to claim 1, characterized in that: in the step (2), when excavating each layer of cavern rock soil, firstly excavating one side of the lattice column, and then excavating the other side of the lattice column, wherein each side is excavated by a step method.
CN202110314801.5A 2021-03-24 2021-03-24 Construction method for deep-buried subway station under rock geology Pending CN113153384A (en)

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Application Number Priority Date Filing Date Title
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* Cited by examiner, † Cited by third party
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JP2006132219A (en) * 2004-11-08 2006-05-25 Toda Constr Co Ltd Underground structure construction method, underground structure, and precast concrete side wall or intermediate wall/pole for use in the same
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CN111779027A (en) * 2020-08-18 2020-10-16 北京中岩智泊科技有限公司 Construction method for constructing underground garage through cover-excavation top-down construction

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