CN114704263B - Method for building large cross section of crossover line by arranging vertical shaft above underground excavation interval of subway - Google Patents
Method for building large cross section of crossover line by arranging vertical shaft above underground excavation interval of subway Download PDFInfo
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- CN114704263B CN114704263B CN202210626919.6A CN202210626919A CN114704263B CN 114704263 B CN114704263 B CN 114704263B CN 202210626919 A CN202210626919 A CN 202210626919A CN 114704263 B CN114704263 B CN 114704263B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D5/00—Lining shafts; Linings therefor
- E21D5/11—Lining shafts; Linings therefor with combinations of different materials, e.g. wood, metal, concrete
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D1/00—Sinking shafts
Abstract
The invention discloses a method for setting a vertical shaft above a subway underground excavation interval to construct a large cross section of a crossover, which comprises the following steps: excavating a vertical shaft and constructing a vertical shaft primary support; constructing a transverse passage primary support and a temporary inverted arch: excavating an inter-zone standard section in the vertical shaft; constructing lining structures of vertical shafts and transverse passages; excavating inter-zone standard sections in the transverse channels; excavating a cross-over line section in the transverse channel; excavating cross-over line sections in the vertical shaft and the transverse channel; and after the construction of the interval tunnel structure is completed, breaking the vertical shaft out of the ground structure, backfilling and covering soil, and recovering the pavement. The method solves the problems of high risk, complex process and great influence on cities in the traditional crossover construction. The invention adopts the structure of jointly building the vertical shaft and the interval tunnel, can reduce the length of the transverse passage, quicken the construction progress of the transverse passage, reduce the engineering investment, meet the excavation requirement of the crossover line, reduce the influence on the surface of the city earth, realize stable structural stress conversion, simplify the construction step and reduce the construction risk.
Description
Technical Field
The invention belongs to the technical field of tunnel construction, and particularly relates to a method for setting a vertical shaft above a subway underground excavation interval to construct a large cross section of a crossover.
Background
Along with the rapid development of rail transit in China, the construction scale of urban subway networks is continuously enlarged, and the construction design of shallow-buried underground excavation, large-span and variable-section tunnels such as return lines and crossover lines in subway sections is increasingly increased.
The section of the shallow-buried underground excavation of the section crossover line is large, soil bodies are disturbed for multiple times through subsection excavation, ground settlement is difficult to control, construction organization is difficult, and construction risk is large. In the traditional design of the underground excavation interval aqueduct, one method is to select a proper position at one side of a ground interval to construct a vertical shaft, excavate a transverse channel vertical to an interval tunnel, coat the maximum section of the aqueduct in the transverse channel, and further use the construction channel as an auxiliary gallery excavation interval main body, and the construction method needs to occupy a site at one side of the interval to construct a vertical shaft structure and has great influence on construction objects at the periphery of the interval; the other type is to enter a variable section and a large-span crossover section from an interval standard section, the section of the interval crossover section is frequently changed from small to large and from large to small, the structural stress conversion is very complex, and great difficulty is brought to construction.
It is very important to research a construction scheme that can reduce the influence on the constructions around the section, reduce the disturbance to the surrounding rock, reduce the construction processes in the multi-arch tunnel, and accelerate the overall construction progress.
The significance of solving the technical problems is as follows:
the regional crossover lines are often complex in surrounding environment, a plurality of pipelines are arranged above the regions, surrounding buildings are dense, the safety of the pipelines and the buildings must be guaranteed during the regional crossover line construction, and enough space is not available for constructing the vertical shaft at many times around the regions. If a new construction method can be provided, the construction method not only can have the function of a construction channel and have enough excavation working surface, thereby reducing the construction risk, but also can avoid occupying the space at two sides of the interval and reducing the influence on the surrounding buildings, thereby being very significant.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provide a method for building a cross-over large section by arranging a vertical shaft above a subway underground excavation region.
The technical scheme of the invention is as follows: a method for setting a vertical shaft above a subway underground excavation interval to construct a large cross section of a crossover line comprises the following steps:
A. excavating a vertical shaft and applying primary support of the vertical shaft;
B. constructing a transverse passage primary support and a temporary inverted arch:
erecting a ingate at the position of a transverse channel to strengthen a grid steel frame, breaking a vertical shaft wall, excavating the transverse channel in a layering manner by a step method, and synchronously constructing a primary support and a temporary inverted arch of the transverse channel according to a step sequence;
C. standard cross section between zones in excavation vertical shaft
Erecting a ingate reinforced grid steel frame at the standard section between the regions in the vertical shaft, breaking the wall of the vertical shaft, and excavating the standard section of the region where the vertical shaft is located by a step method;
D. lining structure for constructing vertical shaft and transverse passage
E. Standard cross section between zones in excavated transverse channel
Erecting a ingate at the standard section between the sections in the transverse channel to strengthen the grid steel frame, breaking the wall of a vertical shaft well, and excavating the standard section between the sections by a step method;
F. cross-over section in excavated transverse channel
Erecting a ingate at the section of the crossover line in the transverse channel to strengthen the grid steel frame, breaking the wall of a vertical shaft well, excavating the section of the crossover line, applying primary support in time, and sealing to form a ring;
G. cross-over line section in excavation vertical shaft and transverse passage
Erecting a ingate at the section of a crossover line in a vertical shaft and a transverse channel to strengthen a grid steel frame, breaking the wall of the shaft, excavating the section of the crossover line, applying primary support in time, and sealing to form a ring;
H. and after the construction of the interval tunnel structure is completed, breaking the vertical shaft out of the ground structure, backfilling and covering soil, and recovering the pavement.
Further, in the step A, the process of excavating the vertical shaft and constructing the initial support of the vertical shaft further comprises the step A of constructing an advance support at the top of the arch, and the concrete process is as follows:
when the vertical shaft is excavated to the arch part of the transverse channel, an advance support is arranged along the arch part of the transverse channel to ensure the stability of soil above the transverse channel;
when the vertical shaft is excavated to the inter-zone standard section arch part in the vertical shaft, a forepoling is arranged along the inter-zone standard section arch part in the vertical shaft, so that the stability of soil above the inter-zone standard section in the vertical shaft is ensured.
Furthermore, in the process of performing primary support and temporary inverted arch of the transverse channel in the step B, the vertical shaft and the bottom of the transverse channel are staggered, the ingate reinforced grating steel frame at the transverse channel is effectively connected with the truncated vertical shaft grating, and the risk of opening the ingate of the transverse channel is reduced.
Furthermore, in the process of excavating the standard section between the regions in the vertical shaft in the step C, the bottom of the standard section between the regions in the vertical shaft and the vertical shaft is subjected to staggered platform design, and the horsehead door reinforcing grid steel frame at the standard section position between the regions in the vertical shaft and the truncated vertical shaft grid can be effectively connected, so that the risk of excavating the horsehead door by the vertical shaft is reduced.
Furthermore, in the process of constructing the lining structure of the vertical shaft and the transverse passage in the step D, a beam-column stress system for ensuring the whole stress safety of the structure is arranged at the side walls at the two sides of the transverse passage by combining the structural type of the cross section of the cross line.
Furthermore, in the process of constructing the lining structures of the vertical shaft and the transverse passage in the step D, the joints of the vertical shaft and the transverse passage and the interval tunnel are provided with the joint ring beams, and after the joint ring beams reach the strength, the excavation of the interval tunnel broken holes in the transverse passage is carried out.
Furthermore, in the process of constructing the vertical shaft and transverse passage lining structures in the step D, pouring of a first layer of sandwich plate in the transverse passage and pouring of a second layer of sandwich plate in the transverse passage are also included, and the concrete process is as follows:
simultaneously pouring a first layer of sandwich plate in the transverse passage and the arch lining of the transverse passage;
and pouring the second-layer sandwich plate in the transverse channel with the section tunnel section at the same time after the section tunnel is broken and excavated.
Furthermore, in the process of excavating the cross-over line section in the transverse channel in the step F and excavating the cross-over line section in the vertical shaft and the transverse channel in the step G, the cross-over line section is transited from a large section to a small section, and the large section is constructed by adopting a double-side-wall pilot tunnel method.
Furthermore, in the process of excavating the cross-over line section in the transverse channel in the step F and excavating the vertical shaft and the cross-over line section in the transverse channel in the step G, the concrete process of excavating the cross-over line section is as follows:
a. adopting a double-side-wall pilot tunnel method, excavating small pilot tunnels on the left and right sides of the cross section of the crossover line at intervals, and constructing chambers on the two sides by a step method;
b. excavating small pilot tunnels on the upper parts of two sides of the cross section of the crossover line, constructing a peripheral primary support and a temporary middle partition wall of the small pilot tunnels on the two sides of the cross section of the crossover line, and sealing a support system;
c. excavating small pilot tunnels at the lower parts of two sides of the cross section of the crossover line, constructing a peripheral primary support and a temporary middle partition wall of the small pilot tunnels at the lower parts of two sides of the cross section of the crossover line, and sealing a support system;
d. excavating small pilot tunnels on the upper parts of the intermediate columns of the cross section, which are adjacent to one side of the small pilot tunnels on the upper parts of the two sides of the cross section, constructing a primary support and a temporary middle partition wall on the periphery of the small pilot tunnels on the upper parts of the intermediate columns of the cross section, and sealing a support system;
e. excavating a small pilot tunnel at the lower part of the intermediate upright post of the cross-over line section corresponding to the small pilot tunnel at the upper part of the intermediate upright post of the cross-over line section, constructing a primary support and a temporary middle partition wall at the periphery of the small pilot tunnel at the lower part of the intermediate upright post of the cross-over line section, and sealing a support system;
f. temporarily supporting the upper small pilot tunnel where the intermediate upright post of the cross section of the crossover line is located and the lower small pilot tunnel where the intermediate upright post of the cross section of the crossover line is located in a sectional manner, constructing a mid-partition wall of the cross section of the crossover line, and reserving structural waterproof and steel bar joints;
g. excavating small pilot tunnels on the upper parts of two sides of the cross section of the crossover line and small upper soil mass pilot tunnels in the middle of the cross section of the crossover line between the small upper pilot tunnels where middle columns of the cross section of the crossover line are positioned, constructing a peripheral primary support and a temporary middle partition wall of the small upper pilot tunnels in the middle of the cross section of the crossover line, and sealing a support system;
h. excavating small pilot tunnels at the lower parts of two sides of the cross section of the crossover line and small soil body lower part pilot tunnels in the middle of the cross section of the crossover line between the small pilot tunnels at the lower parts of middle columns of the cross section of the crossover line, constructing a peripheral primary support and a temporary middle partition wall of the small pilot tunnels in the middle of the soil body lower part of the cross section of the crossover line, and sealing a support system;
i. then, removing temporary intermediate bulkheads within the range of the cross section side span structure of the crossover line in a segmented manner, and integrally pouring the cross section side span structure of the crossover line to finish the cross section side span structure of the crossover line;
j. then removing the temporary middle partition walls in the cross-span structure range of the crossover section in sections, and integrally pouring the cross-span structure of the crossover section to finish the cross-span structure of the crossover section;
k. and (5) finishing excavation and lining construction of the interval tunnel at the crossover line.
The invention has the following beneficial effects:
the method solves the problems of high risk, complex process and great influence on cities in the traditional crossover construction. Compared with the traditional vertical shaft arranged outside the interval, the vertical shaft combined construction method for the urban ground surface can reduce the length of the transverse passage, accelerate the construction progress of the transverse passage, reduce the engineering investment, meet the requirement of aqueduct excavation, reduce the influence on the urban ground surface, realize stable structural stress conversion, simplify the construction step and reduce the construction risk.
Drawings
FIG. 1 is a schematic view of the construction process of a crossover section in the present invention;
FIG. 2 is a longitudinal sectional view of the vertical and horizontal channel excavation according to the present invention;
FIG. 3 is a sectional view of the secondary lining of the vertical shaft and the transverse passage and the related backfill in accordance with the present invention;
FIG. 4 is a sectional view of the secondary lining of the vertical shaft and the transverse passage and the related backfill in the present invention;
figure 5 is a cross-sectional view of a vertical and lateral passage cut in accordance with the present invention;
FIG. 6 is a schematic view of the construction process of the excavation section at the crossover line of the present invention;
FIG. 7 is a cross-sectional view of the preliminary bracing of the cross-section in the horizontal passage and the vertical shaft of the present invention;
FIG. 8 is a cross-sectional view of a cross-over in a transverse passage according to the present invention;
wherein:
101 shaft preliminary bracing 102 transverse passage preliminary bracing
103 vertical shaft inner region inter-region standard section 104 vertical shaft and transverse passage secondary lining
105 cross channel inner zone inter standard cross section 106 cross channel inner cross section
108 shaft top ring beam of cross-over line section in 107 shaft and transverse passage
109 vertical shaft top concrete cover plate 110 vertical shaft and transverse passage intersection end wall
111 cross-over section 112 cross-channel top longitudinal beam
113 cross channel bottom longitudinal beam 114 cross channel column
115 interface ring beam 116 cross channel in the first layer of sandwich plate
Backfilling of plain concrete of a second layer of sandwich plates 118 in 117 transverse channels
Small pilot holes on two sides of 119 crossovers and small pilot holes on two sides of 120 crossovers
Small pilot tunnel on upper part of intermediate upright post of 121 crossover section
Small pilot tunnel at lower part of middle upright post of cross section of 122 crossover
Small pilot tunnel on upper soil body in middle of 123 crossover section
Small pilot tunnel at lower part of soil body in middle of cross section of 124 crossover line
125-aqueduct cross-section side-span structure 126-aqueduct cross-section mid-span structure
127 cross-channel internal crossover non-standard section primary support
128 transverse channel internal crossover non-standard section secondary lining structure
129 shafts intersect the cross passage at a particular column.
Detailed Description
The present invention is described in detail below with reference to the accompanying drawings and examples:
as shown in fig. 1 to 8, a method for setting a shaft above a subway underground excavation region to construct a cross-over large section comprises the following steps:
A. excavating a vertical shaft and constructing a vertical shaft primary support 101;
B. constructing a transverse channel primary support 102 and a temporary inverted arch:
erecting a ingate at the transverse channel to strengthen the grid steel frame, breaking the wall of a vertical shaft, excavating the transverse channel in layers by a step method, and synchronously constructing a primary support 102 and a temporary inverted arch of the transverse channel according to the step sequence;
C. excavation of inter-zone standard section 103 in shaft
Erecting a ingate reinforced grid steel frame at the standard section between the zones in the vertical shaft, breaking the wall of the vertical shaft, and excavating the standard section 103 between the zones in the vertical shaft by a step method;
D. secondary lining 104 for constructing vertical shaft and transverse passage
E. Excavating cross-channel inner zone inter-zone standard section 105
Erecting a ingate reinforced grid steel frame at the standard section between the zones in the transverse channel, breaking the wall of a vertical shaft well, and excavating the standard section 105 between the zones in the transverse channel by a step method;
Erecting a ingate reinforcing grid steel frame at the cross section of the crossover in the transverse channel, breaking the wall of a vertical shaft well, excavating the cross section 106 of the crossover in the transverse channel, timely constructing primary support, and sealing to form a ring;
Erecting a ingate reinforcing grid steel frame at the cross section of the crossover in the vertical shaft and the transverse passage, breaking the wall of the vertical shaft, performing the cross section 107 of the crossover in the vertical shaft and the transverse passage, performing primary support in time, and sealing to form a ring;
H. and after the construction of the interval tunnel structure is completed, breaking the vertical shaft out of the ground structure, backfilling and covering soil, and recovering the pavement.
Step A, excavating a vertical shaft and constructing a preliminary support of the vertical shaft, wherein the preliminary support of the vertical shaft also comprises an arch top part and a forepoling, and the concrete process comprises the following steps:
when the vertical shaft is excavated to the arch part of the transverse channel, an advance support is arranged along the arch part of the transverse channel to ensure the stability of soil above the transverse channel;
when the vertical shaft is excavated to the inter-zone standard section arch part in the vertical shaft, a forepoling is arranged along the inter-zone standard section arch part in the vertical shaft, so that the stability of soil above the inter-zone standard section in the vertical shaft is ensured.
Specifically, in the process of excavating the vertical shaft and constructing the vertical shaft primary support 101 in the step A, the vertical shaft and the transverse channel are synchronously excavated in layers, and the vertical shaft and the transverse channel are excavated along with excavation, so that the convenience and safety of construction can be effectively improved, and after the vertical shaft is excavated and supported to the bottom of the vertical shaft, the bottom of the vertical shaft needs to be timely sealed, and a construction platform is erected.
And B, in the process of constructing the initial support and the temporary inverted arch of the transverse channel, the vertical shaft and the bottom of the transverse channel are staggered, the ingate reinforcing grid steel frame at the transverse channel is effectively connected with the truncated vertical shaft grid, and the risk of opening the ingate of the transverse channel is reduced.
Specifically, in the process of constructing the primary support and the temporary inverted arch of the transverse channel in the step B, the construction of an advance support is also included, and the concrete process is as follows:
when the transverse passage is excavated to the 105 arch parts of the inter-zone standard sections in the transverse passage, advance supports are arranged along the arch parts of the inter-zone tunnels, and the stability of soil bodies above the inter-zone tunnels is ensured.
When the transverse channel is excavated to the 106 arch part of the cross-over line section in the transverse channel, an advance support is arranged along the arch part of the interval tunnel, so that the stability of the soil body above the interval tunnel is ensured.
When the transverse channel is excavated to the arch part of the cross-over line section 107 in the vertical shaft and the transverse channel, an advance support is arranged along the arch part of the interval tunnel, so that the stability of soil above the interval tunnel is ensured.
Specifically, in the process of constructing the preliminary support and the temporary inverted arch of the transverse passage in the step B, when a lower step cavern of the transverse passage is excavated by a step method, the staggered distance between the lower step cavern and the previous cavern is generally controlled to be 1-1.5 times of the diameter of the cavern.
And C, in the process of excavating the standard section between the zones in the vertical shaft, the bottom of the standard section between the zones in the vertical shaft and the vertical shaft is staggered, the horsehead door reinforcing grid steel frame at the standard section between the zones in the vertical shaft can be effectively connected with the truncated vertical shaft grid, and the risk of excavating the horsehead door by the vertical shaft is reduced.
And D, particularly, in the process of constructing a secondary lining of the vertical shaft and the transverse channel in the step D, a beam-column stress system for ensuring the whole stress safety of the structure is arranged at the side walls on the two sides of the transverse channel by combining the structural type of the cross section of the cross line.
Specifically, in the process of constructing the secondary lining of the vertical shaft and the transverse passage in the step D, the joints of the vertical shaft and the transverse passage and the interval tunnel are provided with the interface ring beams 115, and after the interface ring beams 115 reach the strength, the excavation of the interval tunnel broken holes in the transverse passage is carried out.
In the process of constructing the secondary lining of the vertical shaft and the transverse channel in the step D, holes are formed in three surfaces of the vertical shaft, the structural stress system is complex, L-shaped corner columns are arranged at two corner parts connecting the vertical shaft and the transverse channel, the stress requirements of the interface ring beam and the beam column system in the transverse channel are met, and the structural stress conversion problem is solved.
Step E, in the process of excavating the inter-regional standard sections in the transverse channel, pouring of a first sandwich plate layer in the transverse channel and a second sandwich plate layer in the transverse channel is further included, and the concrete process is as follows:
simultaneously pouring a first layer of sandwich plate in the transverse passage and the arch lining of the transverse passage;
and pouring the second-layer sandwich plate in the transverse channel with the section tunnel section at the same time after the section tunnel is broken and excavated.
Specifically, in the process of excavating the inter-zone standard section in the transverse channel in the step E, the top of the side wall of the vertical shaft is provided with a vertical shaft top ring beam 108, so that the integral stability of the structure during construction is ensured.
Specifically, in the process of excavating the inter-zone standard section in the transverse channel in the step E, after the inter-zone tunnel construction is completed, a concrete cover plate 109 at the top of the vertical shaft and an end wall 110 at the intersection of the vertical shaft and the transverse channel are poured.
The beam-column stress system comprises a transverse channel bottom longitudinal beam 113 positioned at the bottom and a transverse channel top longitudinal beam 112 positioned at the top, and a transverse channel column 114 is arranged between the transverse channel bottom longitudinal beam 113 and the transverse channel top longitudinal beam 112. The transverse channel bottom longitudinal beam 113, the transverse channel top longitudinal beam 112 and the transverse channel pillar 114 are combined to form a beam-pillar stress system, so that the whole stress safety of the structure is ensured.
The second sandwich plate 117 in the transverse passage arranged in the transverse passage can effectively solve the problem of high side walls on two sides of the transverse passage, so that the stress system of the whole structure is clearer, and the overall stability of the structure is enhanced.
Specifically, step E excavates the interior intersegmental standard section of cross aisle in-process, still includes cross aisle lining bottom plate and the setting of staggering of interval tunnel lining bottom plate, and plain concrete backfills 118 and need carries out after the completion is done in interval tunnel structure, satisfies the track demand.
And F, in the process of excavating the cross-over line section in the transverse channel and G, in the process of excavating the cross-over line section in the vertical shaft and the transverse channel, the cross-over line section is transited from a large section to a small section, and the large section is constructed by adopting a double-side-wall pilot tunnel method.
Specifically, in the process of excavating the cross-over line section in the transverse channel in the step F and excavating the cross-over line section in the vertical shaft and the transverse channel in the step G, when the cross-over line section is transited from a large section to a small section, the small section is overlapped with the large section, and a large-section primary support is adopted at the overlapped part, so that the integral stability of the excavated section is ensured.
Specifically, step B is executed and is done horizontal passageway preliminary bracing and interim inverted arch in-process, still includes after the shaft excavates certain degree of depth, and horizontal passageway and shaft are excavated in step, and concrete process is as follows:
a. adopting an inverted well wall method, excavating vertical wells in a downward layered mode, performing primary support, excavating to the arch part of a ingate of a transverse passage, and then driving advanced support;
b. excavating a vertical shaft to the bottom of a chamber of an upper step of the transverse channel, carrying out temporary bottom sealing on the vertical shaft, breaking a well wall, excavating the chamber of the upper step of the transverse channel by a step method, and applying primary support and temporary inverted arch;
c. excavating a vertical shaft to the bottom of a second step chamber of the transverse passage, temporarily sealing the bottom of the vertical shaft, excavating an advance support at a ingate of the transverse passage, breaking a well wall, excavating a lower step chamber of the transverse passage by a step method, constructing at a staggered distance with the previous chamber, and constructing an initial support and a temporary inverted arch;
d. and excavating the vertical shaft to the bottom of the shaft, sealing the bottom, constructing advanced supports at the ingate of the transverse passage, breaking the well wall, excavating a third step chamber of the transverse passage by a step method, constructing by staggering a distance with the previous chamber, constructing an initial support and sealing the bottom of the transverse passage, and finishing the initial support of the vertical shaft and the transverse passage.
Specifically, step D is executed and is done shaft and cross access lining structure in-process, and shaft and cross access lining structure pour step by step, and concrete process is as follows:
a. constructing a bottom plate cushion layer, a waterproof layer, a bottom plate (bottom beam) structure and part of side walls of the vertical shaft and the transverse passage;
b. constructing a joint ring beam, a hidden column and part of side walls in the vertical shaft and the transverse passage from bottom to top, and dismantling temporary inverted arches in the transverse passage in a distributed and sectional manner;
c. constructing a first layer of sandwich plate and a middle beam in the transverse channel, and reserving reinforcing steel bars for a second layer of sandwich plate;
d. lining the upper side wall and the arch part of the transverse passage of the first interlayer plate of the transverse passage, and sealing the structure to form a ring; after the side wall structure of the vertical shaft is constructed to the top, a ring beam at the top of the vertical shaft is constructed, so that the integral stability of the structure during construction is ensured;
e. after the section tunnel is excavated, a second-layer sandwich plate in the transverse channel and the section tunnel section are synchronously poured;
f. after the internal structures of the interval tunnel and the transverse channel are completely constructed, pouring end walls at the intersection of the vertical shaft and the transverse channel;
g. and (5) applying a concrete cover plate and a cover plate waterproof layer on the top of the vertical shaft to finish the construction of the lining structure in the vertical shaft and the transverse passage.
Specifically, in the process of constructing the vertical shaft and the transverse passage secondary lining in the step D, the vertical shaft lining structure needs to be designed in an inclusive mode by comprehensively considering the transverse passage structure and a straight line tunnel structure below the vertical shaft, and boundary requirements of lining internal pipelines, driving, evacuating and the like are met.
In the process of excavating the cross line section in the transverse channel and the process of excavating the cross line sections in the vertical shaft and the transverse channel in the step G, the specific excavating process of the cross line section 111 is as follows:
a. adopting a double-side-wall pilot tunnel method, excavating small pilot tunnels on the left and right sides of the cross section of the crossover line at intervals, and constructing chambers on the two sides by a step method;
b. excavating small pilot tunnels on the upper parts of two sides of the cross section of the crossover line, constructing a peripheral primary support and a temporary middle partition wall of the small pilot tunnels on the two sides of the cross section of the crossover line, and sealing a support system;
c. excavating small pilot tunnels at the lower parts of two sides of the cross section of the crossover line, constructing a peripheral primary support and a temporary middle partition wall of the small pilot tunnels at the lower parts of two sides of the cross section of the crossover line, and sealing a support system;
d. excavating small pilot tunnels on the upper parts of the intermediate columns of the cross section, which are adjacent to one side of the small pilot tunnels on the upper parts of the two sides of the cross section, constructing a primary support and a temporary middle partition wall on the periphery of the small pilot tunnels on the upper parts of the intermediate columns of the cross section, and sealing a support system;
e. excavating a small pilot tunnel at the lower part of the intermediate upright post of the cross-over line section corresponding to the small pilot tunnel at the upper part of the intermediate upright post of the cross-over line section, constructing a primary support and a temporary middle partition wall at the periphery of the small pilot tunnel at the lower part of the intermediate upright post of the cross-over line section, and sealing a support system;
f. temporarily supporting the upper small pilot tunnel where the intermediate upright post of the cross section of the crossover line is located and the lower small pilot tunnel where the intermediate upright post of the cross section of the crossover line is located in a sectional manner, constructing a mid-partition wall of the cross section of the crossover line, and reserving structural waterproof and steel bar joints;
g. excavating small pilot tunnels on the upper parts of two sides of the cross section of the crossover line and small upper soil mass pilot tunnels in the middle of the cross section of the crossover line between the small upper pilot tunnels where middle columns of the cross section of the crossover line are positioned, constructing a peripheral primary support and a temporary middle partition wall of the small upper pilot tunnels in the middle of the cross section of the crossover line, and sealing a support system;
h. excavating small pilot tunnels at the lower parts of two sides of the cross section of the crossover line and small soil body lower part pilot tunnels in the middle of the cross section of the crossover line between the small pilot tunnels at the lower parts of middle columns of the cross section of the crossover line, constructing a peripheral primary support and a temporary middle partition wall of the small pilot tunnels in the middle of the soil body lower part of the cross section of the crossover line, and sealing a support system;
i. then, removing temporary intermediate bulkheads within the range of the cross section side span structure of the crossover line in a segmented manner, and integrally pouring the cross section side span structure of the crossover line to finish the cross section side span structure of the crossover line;
j. then removing the temporary middle partition walls in the cross-span structure range of the crossover section in sections, and integrally pouring the cross-span structure of the crossover section to finish the cross-span structure of the crossover section;
k. and (5) finishing excavation and lining construction of the interval tunnel at the crossover line.
Specifically, the cross line section 106 in the transverse channel needs to be constructed in a staggered mode with the standard section 103 between the zones in the vertical shaft, and the staggered distance is not less than 15 m.
Specifically, the cross section 107 in the vertical shaft and the transverse passage needs to be constructed in a staggered manner with the standard cross section between the zones in the transverse passage, and the staggered distance is not less than 15 m.
And F, excavating a cross line section in the transverse channel and G excavating a cross line section in the vertical shaft and the transverse channel, wherein the staggered distance of the small pilot tunnels on the left side and the right side is not less than 15m in the construction process of the cross line section by adopting a double-side-wall pilot tunnel method.
Specifically, in the construction process of the crossline section by adopting a double-side-wall pilot tunnel method, the staggered distance of the small pilot tunnels on the left side and the right side is not less than 15 m.
Further, in the step G, the widths of the structures of the vertical shaft and the transverse passage in the cross-over line sections of the vertical shaft and the transverse passage are different, so that the cross-over line sections in the vertical shaft and the transverse passage are not coplanar, part of the cross-over line sections are connected with the transverse passage, and part of the cross-over line sections are connected with the vertical shaft.
Specifically, in the process of excavating the cross-over line sections in the vertical shaft and the transverse channel in the step G, transitional excavation is carried out on the cross-over line sections step by step, and the specific process is as follows:
a cross-over line section broken hole in the transverse channel is excavated, a cross-over line section primary support is constructed, and the cross-over line section primary support and a vertical shaft primary support are sealed to form a ring, so that a stress system is ensured to be stable;
and (4) excavating the broken holes of the cross-over line sections in the vertical shaft, merging the broken holes with the cross-over line sections in the transverse passage into a large section, and adopting a double-side-wall pilot tunnel method to perform subsequent section excavation.
As a solution, the excavation needs to be performed in a subsection mode in a grading mode, a crosswalk nonstandard section primary support 127 in a local transverse channel needs to be erected on a vertical shaft primary support to form a closed structure, and the stress safety of the primary support is guaranteed.
As another solution, a special column 129 at the intersection of the vertical shaft and the transverse passage is arranged at the intersection of the vertical shaft and the transverse passage, which not only can play a role of connecting an interface ring beam, but also can be used as a support of a secondary lining structure 128 with a non-standard section of a cross-over line in the transverse passage, and the structure is connected with the column after the cross-over line section in the transverse passage is out of the transverse passage, thereby ensuring the whole stress safety of the structure.
As shown in fig. 1, firstly, excavating a vertical shaft above a subway underground excavation region and applying a vertical shaft primary support 101, then excavating a transverse channel and applying a transverse channel primary support 102, wherein the transverse channel envelops a cross-over large section; then, excavating an interregional standard section 103 in the vertical shaft; then secondary lining 104 of the vertical shaft and the transverse passage; then excavating an inter-zone standard section 105 in the transverse channel; then, excavating a cross line section 106 in the transverse channel; finally, a cross-over section 107 in the vertical and horizontal channels is excavated.
As shown in fig. 2 and 5, excavating a transverse channel from the inside of a vertical shaft, excavating a soil body of the transverse channel at intervals by adopting a step method, and applying an inverted arch in time to form primary support; then, sequentially downwards excavating a second transverse channel and a third transverse channel, and constructing a temporary inverted arch at the lower part of the transverse channel to form a primary support; and finishing the excavation of the transverse channel at the crossover line and finally forming an integral stress system.
The method solves the problems of high risk, complex process and great influence on cities in the traditional crossover construction. Compared with the traditional vertical shaft arranged outside the interval, the vertical shaft combined construction method for the urban ground surface can reduce the length of the transverse passage, accelerate the construction progress of the transverse passage, reduce the engineering investment, meet the requirement of aqueduct excavation, reduce the influence on the urban ground surface, realize stable structural stress conversion, simplify the construction step and reduce the construction risk.
Claims (9)
1. A method for setting a vertical shaft above a subway underground excavation interval to construct a large cross section of a crossover line is characterized by comprising the following steps: the method comprises the following steps:
A. excavating a vertical shaft and constructing a vertical shaft primary support;
B. constructing a transverse passage primary support and a temporary inverted arch:
erecting a ingate at the position of a transverse channel to strengthen a grid steel frame, breaking a vertical shaft wall, excavating the transverse channel in a layering manner by a step method, and synchronously constructing a primary support and a temporary inverted arch of the transverse channel according to a step sequence;
C. inter-zone standard section in excavation vertical shaft
Erecting a ingate reinforced grid steel frame at the standard section between the regions in the vertical shaft, breaking the wall of the vertical shaft, and excavating the standard section of the region where the vertical shaft is located by a step method;
D. lining structure for constructing vertical shaft and transverse passage
E-excavation cross-channel inner inter-zone standard section
Erecting a ingate at the standard section between the zones in the transverse channel to strengthen the grid steel frame, breaking the wall of a vertical shaft well, and excavating the standard section between the zones in the transverse channel by a step method;
F. cross-over section in excavated transverse channel
Erecting a ingate at the section of the crossover line in the transverse channel to strengthen the grid steel frame, breaking the wall of a vertical shaft well, excavating the section of the crossover line in the transverse channel, timely applying primary support, and sealing to form a ring;
G. cross-over line section in excavation vertical shaft and transverse passage
Erecting a ingate reinforcing grid steel frame at the cross section of the crossover in the vertical shaft and the transverse passage, breaking the wall of the vertical shaft, excavating the cross section of the crossover in the vertical shaft and the transverse passage, applying primary support in time, and sealing to form a ring;
H. and after the construction of the interval tunnel structure is completed, breaking the vertical shaft out-of-ground structure, backfilling the soil and recovering the pavement.
2. The method for building the cross-over large section by arranging the vertical shaft above the underground excavation interval of the subway according to claim 1, wherein the method comprises the following steps: step A, excavating a vertical shaft and constructing a vertical shaft primary support, wherein the process of constructing the vertical shaft primary support also comprises constructing an advance support at the top of an arch, and the concrete process is as follows:
when the vertical shaft is excavated to the arch part of the transverse channel, an advance support is arranged along the arch part of the transverse channel to ensure the stability of soil above the transverse channel;
when the vertical shaft is excavated to the inter-zone standard section arch part in the vertical shaft, a forepoling is arranged along the inter-zone standard section arch part in the vertical shaft, so that the stability of soil above the inter-zone standard section in the vertical shaft is ensured.
3. The method for building the cross-over large section by arranging the vertical shaft above the underground excavation interval of the subway according to claim 1, wherein the method comprises the following steps: and B, in the process of constructing the initial support and the temporary inverted arch of the transverse channel, the vertical shaft and the bottom of the transverse channel are staggered, the ingate reinforcing grid steel frame at the transverse channel is effectively connected with the truncated vertical shaft grid, and the risk of opening the ingate of the transverse channel is reduced.
4. The method for building the cross-over large section by arranging the vertical shaft above the underground excavation interval of the subway according to claim 1, wherein the method comprises the following steps: and C, in the process of excavating the standard section between the zones in the vertical shaft, the bottom of the standard section between the zones in the vertical shaft and the vertical shaft is staggered, the horsehead door reinforcing grid steel frame at the standard section between the zones in the vertical shaft can be effectively connected with the truncated vertical shaft grid, and the risk of excavating the horsehead door by the vertical shaft is reduced.
5. The method for building the cross-over large section by arranging the vertical shaft above the underground excavation interval of the subway according to claim 1, wherein the method comprises the following steps: and D, in the process of constructing a vertical shaft and transverse channel lining structure, a beam column stress system for ensuring the whole stress safety of the structure is arranged at the side walls on the two sides of the transverse channel by combining the structural type of the cross section of the cross line.
6. The method for building the cross-over large section by arranging the vertical shaft above the underground excavation interval of the subway according to claim 1, wherein the method comprises the following steps: and D, in the process of constructing the vertical shaft and transverse channel lining structures, interface ring beams are arranged at the joints of the vertical shaft and the transverse channel and the inter-zone tunnels, and the inter-zone tunnel broken holes are excavated in the transverse channel after the interface ring beams reach the strength.
7. The method for building the cross-over large section by arranging the vertical shaft above the underground excavation interval of the subway according to claim 1, wherein the method comprises the following steps: step D, in the process of constructing the vertical shaft and the transverse passage lining structure, pouring of a first layer of sandwich plate in the transverse passage and pouring of a second layer of sandwich plate in the transverse passage are also included, and the concrete process is as follows:
simultaneously pouring a first layer of sandwich plate in the transverse passage and the arch lining of the transverse passage;
and pouring the second-layer sandwich plate in the transverse channel with the section tunnel section at the same time after the section tunnel is broken and excavated.
8. The method for building the cross-over large section by arranging the vertical shaft above the underground excavation interval of the subway according to claim 1, wherein the method comprises the following steps: and F, excavating a cross-over line section in the transverse channel and G, wherein the cross-over line section is transited from a large section to a small section in the vertical shaft and the cross-over line section in the transverse channel, and the large section is constructed by adopting a double-side-wall pilot tunnel method.
9. The method for building the cross-over large section by arranging the vertical shaft above the underground excavation interval of the subway according to claim 8, wherein the method comprises the following steps: f, excavating a cross line section in the transverse channel and G, wherein the concrete process of excavating the cross line section in the vertical shaft and the transverse channel is as follows:
a. adopting a double-side-wall pilot tunnel method, excavating small pilot tunnels on the left and right sides of the cross section of the crossover line at intervals, and constructing chambers on the two sides by a step method;
b. excavating small pilot tunnels on the upper parts of two sides of the cross section of the crossover line, constructing a peripheral primary support and a temporary middle partition wall of the small pilot tunnels on the two sides of the cross section of the crossover line, and sealing a support system;
c. excavating small pilot tunnels at the lower parts of two sides of the cross section of the crossover line, constructing a peripheral primary support and a temporary middle partition wall of the small pilot tunnels at the lower parts of two sides of the cross section of the crossover line, and sealing a support system;
d. excavating small pilot tunnels on the upper parts of the intermediate columns of the cross section, which are adjacent to one side of the small pilot tunnels on the upper parts of the two sides of the cross section, constructing a primary support and a temporary middle partition wall on the periphery of the small pilot tunnels on the upper parts of the intermediate columns of the cross section, and sealing a support system;
e. excavating a small pilot tunnel at the lower part of the intermediate upright post of the cross-over line section corresponding to the small pilot tunnel at the upper part of the intermediate upright post of the cross-over line section, constructing a primary support and a temporary middle partition wall at the periphery of the small pilot tunnel at the lower part of the intermediate upright post of the cross-over line section, and sealing a support system;
f. temporarily supporting the upper small pilot tunnel where the intermediate upright post of the cross section of the crossover line is located and the lower small pilot tunnel where the intermediate upright post of the cross section of the crossover line is located in a sectional manner, constructing a mid-partition wall of the cross section of the crossover line, and reserving structural waterproof and steel bar joints;
g. excavating small pilot tunnels on the upper parts of two sides of the cross section of the crossover line and small upper soil mass pilot tunnels in the middle of the cross section of the crossover line between the small upper pilot tunnels where middle columns of the cross section of the crossover line are positioned, constructing a peripheral primary support and a temporary middle partition wall of the small upper pilot tunnels in the middle of the cross section of the crossover line, and sealing a support system;
h. excavating small pilot tunnels at the lower parts of two sides of the cross section of the crossover line and small soil body lower part pilot tunnels in the middle of the cross section of the crossover line between the small pilot tunnels at the lower parts of middle columns of the cross section of the crossover line, constructing a peripheral primary support and a temporary middle partition wall of the small pilot tunnels in the middle of the soil body lower part of the cross section of the crossover line, and sealing a support system;
i. then, removing temporary intermediate bulkheads within the range of the cross section side span structure of the crossover line in a segmented manner, and integrally pouring the cross section side span structure of the crossover line to finish the cross section side span structure of the crossover line;
j. then removing the temporary middle partition walls in the cross-span structure range of the crossover section in sections, and integrally pouring the cross-span structure of the crossover section to finish the cross-span structure of the crossover section;
k. and (5) finishing excavation and lining construction of the interval tunnel at the crossover line.
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