CN112228096A - Construction method of auxiliary structure of subway station - Google Patents
Construction method of auxiliary structure of subway station Download PDFInfo
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- CN112228096A CN112228096A CN202011002106.7A CN202011002106A CN112228096A CN 112228096 A CN112228096 A CN 112228096A CN 202011002106 A CN202011002106 A CN 202011002106A CN 112228096 A CN112228096 A CN 112228096A
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- Prior art keywords
- subway station
- auxiliary structure
- jacking machine
- pipe jacking
- auxiliary
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- 238000010276 construction Methods 0.000 title claims abstract description 44
- 238000011065 in-situ storage Methods 0.000 claims abstract description 4
- 238000009423 ventilation Methods 0.000 claims description 13
- 238000005192 partition Methods 0.000 claims description 7
- 239000002689 soil Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 230000007123 defense Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/10—Making by using boring or cutting machines
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/04—Making large underground spaces, e.g. for underground plants, e.g. stations of underground railways; Construction or layout thereof
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining 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
- E21D11/105—Transport 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/003—Ventilation of traffic tunnels
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/04—Air ducts
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Sustainable Development (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention relates to the field of rail traffic engineering, and discloses a construction method of an auxiliary structure of a subway station, which comprises the following steps: determining the position of each auxiliary structure according to a construction drawing; constructing an open cut part of each auxiliary structure, and constructing a pipe jacking machine starting well on the open cut part of each auxiliary structure; the circular pipe jacking machine is arranged in place in the originating well; constructing the circular pipe jacking machine along the line of the auxiliary structure until all prefabricated pipe joints are installed and the circular pipe jacking machine jacks to the interface position of the subway station main body, wherein the prefabricated pipe joints of all the auxiliary structures are the same in size; the circular pipe jacking machine is disassembled in situ, the shell of the pipe jacking machine is connected with the prefabricated pipe joints to form an underground excavated tunnel section, and other disassembled parts are retreated to the starting well and then lifted out; the side wall of the interface position between the subway station main body and the auxiliary structure is broken; constructing a ring beam and an internal structure at the position of the interface and decorating: the invention standardizes and modularizes the construction scheme, reduces the interference of construction to ground traffic and can improve the construction efficiency.
Description
Technical Field
The invention relates to the field of rail traffic engineering, in particular to a construction method of an auxiliary structure of a subway station.
Background
The underground railway station of the rail transit is usually arranged below an urban road, a main body part of the station does not need to go out of the ground and is generally arranged under the road, and an auxiliary structure (comprising facilities such as a station access, a safety exit, ventilation and the like) of the underground railway station needs to go out of the ground and is generally arranged outside a red line of the road. Part of the entrances and exits also have the function of urban street crossing, so the entrances and exits generally need to cross urban roads.
According to the consideration of multiple factors such as geological conditions, subway construction period, construction steps and the like, the underground station is constructed by adopting an open cut method, and is constructed by stages, wherein a main part is constructed in advance, and then an auxiliary part is constructed.
In order to ensure the normal construction of the subway station, pipelines below the municipal road which conflicts with the station are moved and changed and ground traffic is dredged during the construction of the main body, and the pipelines are often moved and changed and traffic is dredged again when the construction is attached. The secondary moving and modifying of the pipelines is caused, the moving and modifying cost of the pipelines is wasted, the construction period of the subway is prolonged, and the urban pipelines and ground traffic are greatly influenced.
Especially when meeting important pipeline or underdrain river surge, for example 110KV or 220KV high-voltage line, national defense optical cable, blow-off pipe etc. move and change the degree of difficulty great, influence the wide range, even also influenced the setting of the affiliated structure of subway station.
Disclosure of Invention
The invention aims to provide a construction method of an auxiliary structure of a subway station, which enables a building scheme to be standardized and modularized, reduces the interference of construction on ground traffic and can improve the construction efficiency.
In order to achieve the above object, the present invention provides a construction method of an auxiliary structure of a subway station, comprising the steps of:
s1, determining the positions of the auxiliary structures according to the construction drawing;
s2, constructing the open cut parts of the auxiliary structures, and constructing a pipe jacking machine starting well on the open cut parts of the auxiliary structures;
s3, installing the circular pipe jacking machine in place in the originating well;
s4, starting construction by the circular pipe jacking machine along the line axis of the auxiliary structure, and installing the prefabricated pipe sections section by section until all the prefabricated pipe sections are installed and the circular pipe jacking machine jacks to the interface position of the subway station main body; wherein the prefabricated pipe sections of all the auxiliary structures have the same size;
s5, disassembling the circular pipe jacking machine in situ, keeping the shell of the pipe jacking machine in a soil body to serve as a supporting structure, connecting the shell of the pipe jacking machine with the prefabricated pipe joints to form an underground excavated tunnel section, retreating other disassembled parts to an originating well, and then lifting out;
s6, breaking the side wall at the interface position with the auxiliary structure in the subway station main body to communicate the auxiliary structure with the subway station main body;
and S7, constructing a ring beam at the interface position, and finishing the internal structure.
As a preferred aspect of the present invention, the accessory structure includes an access passage and a ventilation passage.
In a preferred embodiment of the present invention, the inner diameter of the prefabricated pipe section is 7 m.
As a preferable scheme of the invention, the length of the prefabricated pipe section is 2-2.5 m, and the wall thickness of the prefabricated pipe section is 400-500 mm.
As a preferable aspect of the present invention, partition walls are constructed in both the underground excavated tunnel section and the open excavated portion of the ventilation channel in step S7; the ventilation channel comprises a fresh air channel, an exhaust air channel, a first piston air channel and a second piston air channel, the fresh air channel and the exhaust air channel are arranged in the same underground excavated tunnel section and are separated through a partition wall, and the first piston air channel and the second piston air channel are arranged in the same underground excavated tunnel section and are separated through a partition wall.
As the preferable scheme of the invention, the fresh air duct is respectively provided with a safety outlet and a fresh air pavilion which are connected with the fresh air duct at the open cut part.
In a preferred embodiment of the present invention, the exhaust duct is provided with an exhaust booth at an open cut portion, the first piston duct is provided with a first piston booth at the open cut portion, and the second piston duct is provided with a second piston booth at the open cut portion.
As a preferable aspect of the present invention, the bottom of the undercut tunnel segment is backfilled with concrete in step S7.
Compared with the prior art, the construction method of the auxiliary structure of the subway station has the following beneficial effects that:
according to the embodiment of the invention, the starting well is arranged at the open cut part, so that the construction land of the original open cut structure can be fully utilized, the influence on the trip of peripheral businesses and citizens is reduced, the traffic is not sealed, the pipeline is not changed, the noise is low, the dust is less, the interference of construction on ground traffic can be effectively eliminated, and the early-stage investment of engineering is reduced; the circular pipe jacking machine can cancel a receiving well by an active shell abandoning mode, reduce the construction cost and save the construction period, and the shell of the pipe jacking machine can be used as a supporting structure to form a part of an underground excavated tunnel section; the circular pipe jacking machine is used for construction, a cutter disc hob and a scraper of the circular pipe jacking machine are arranged to be mutually coordinated, power can be conveyed to the hob in a centralized mode, the cutter disc is large, the thickness, the rigidity and the strength are large, the circular pipe jacking machine can be suitable for terrains of the quaternary strata and rock strata with medium and low compressive strength, the application range is wide, the specifications of prefabricated pipe joints in all auxiliary structures are the same, the building scheme is standardized and modularized, the prefabricated tool is unified, and the efficiency is high, cost is low.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.
FIG. 1 is a schematic structural view of an undercut tunnel segment provided by the present invention;
FIG. 2 is a schematic view of the structure of the doorway channel;
FIG. 3 is a schematic longitudinal cross-section of the port channel;
FIG. 4 is a cross-sectional schematic view of the access channel;
FIG. 5 is a schematic view of the structure of the ventilation channel;
FIG. 6 is a cross-sectional schematic view of a ventilation channel;
in the figure, 1 is a subway station main body; 2 is an open cut part; 3, a subsurface tunnel section; 31 is a prefabricated pipe section; 32 is the shell of the push bench; 33 is a lining layer; 34 is a ring beam; 4 is an inlet and outlet channel; 41, a backfilled concrete layer; 5 is a fresh air duct; 51 is a safety exit; 52 is a fresh air pavilion; 6 is an exhaust duct; the air exhaust pavilion 61; the first piston air duct 7 is; 71 is a first piston bellows; 8 is a second piston air duct; a second piston bellows 81; 9 is a dividing wall.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, which are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.
As shown in fig. 1 to 6, a construction method of an auxiliary structure of a subway station according to a preferred embodiment of the present invention includes the steps of:
s1, determining the positions of the auxiliary structures according to the construction drawing;
s2, constructing the open cut parts 2 of the auxiliary structures, and constructing a pipe jacking machine starting well on the open cut parts 2 of the auxiliary structures;
s3, installing the circular pipe jacking machine in place in the originating well;
s4, starting construction by the circular pipe jacking machine along the line axis of the auxiliary structure, and installing the prefabricated pipe sections 31 section by section until all the prefabricated pipe sections 31 are installed and the circular pipe jacking machine jacks to the interface position of the subway station main body 1; the prefabricated pipe sections 31 of all the auxiliary structures are the same in size;
s5, disassembling the circular pipe jacking machine in situ, keeping the pipe jacking machine shell 32 in a soil body to serve as a supporting structure, erecting a temporary door type steel support inside the pipe jacking machine shell 32, preventing the pipe jacking machine shell 32 from deforming after the internal components of the circular pipe jacking machine are disassembled, connecting the pipe jacking machine shell 32 with the prefabricated pipe section 31 to form a buried tunnel section 3, and retreating other disassembled components to an originating well for hoisting;
s6, breaking the side wall of the interface position between the main body 1 of the subway station and the auxiliary structure, and applying interface construction joint and waterproof treatment to the interface position to enable the auxiliary structure to be communicated with the main body 1 of the subway station;
s7, ring beam 34 for constructing the interface position, internal structure and decoration.
Illustratively, the auxiliary structure comprises an inlet channel 4 and an outlet channel and a ventilation channel, and the inner diameter of the prefabricated pipe section 31 is 7 m; the length of the prefabricated pipe joint 31 is 2 m-2.5 m, the wall thickness of the prefabricated pipe joint 31 is 400 mm-500 mm, the prefabricated pipe joint 31 with the inner diameter of 7m can meet the requirement of the ventilation area and the requirement of the passageway 4, if the prefabricated pipe joint 31 with the inner diameter larger than 7m is adopted, space waste is caused, the manufacturing cost is increased, the prefabricated pipe joint 31 with the inner diameter smaller than 7m can meet the requirement of the passageway 4, but the requirement of the air channel area cannot be met.
Constructing partition walls 9 in both the underground excavated tunnel section 3 and the open excavated portion 2 of the ventilation passageway at step S7; ventilation passageway includes new wind channel 5, exhaust airway 6, first piston wind channel 7 and second piston wind channel 8, new wind channel 5 and exhaust airway 6 set up in same undercut tunnel section 3 and separate through divider wall 9, first piston wind channel 7 with second piston wind channel 8 sets up in same undercut tunnel section 3 and separates through divider wall 9, sets up two wind channels in undercut tunnel section 3 of same 7m internal diameter, and can satisfy wind channel technological requirement, can make the prefabricated pipe coupling 31 of same specification construct, and the building scheme is standardized, modularization, greatly reduced engineering cost. In addition, the devices (fans, air valves, mufflers, etc.) in the fresh air duct 5, the exhaust air duct 6, the first piston air duct 7 and the second piston air duct 8 are the same as those used in the existing air ducts, and are not described in detail herein; wherein, the equipment in fresh air duct 5, exhaust duct 6, first piston wind channel 7 and second piston wind channel 8 can be placed in subway station main part 1 to shorten the length of wind channel. And in step S7, the inside of the push pipe machine shell 32 in the underground excavated tunnel section 3 is lined to form the lining 33 to form secondary support, thereby improving the structural stability of the underground excavated tunnel section 3.
Illustratively, the fresh air duct 5 is provided with a safety outlet 51 and a fresh air pavilion 52 which are connected with the fresh air duct 5 at the open excavation part 2, and only the basic air passing amount is required to be satisfied functionally, no requirement is made on the building form of the air duct, and the safety outlet 51 and the fresh air pavilion 52 which are mutually independent are arranged at the tail end of the fresh air duct 5, so that the fresh air duct 5 is also used as a safety outlet channel, and the maximum utilization of the space function is realized; exhaust duct 6 sets up exhaust pavilion 61 in the portion of digging openly 2, first piston wind channel 7 sets up first piston wind pavilion 71 in the portion of digging openly 2, second piston wind channel 8 sets up second piston wind pavilion 81 in the portion of digging openly 2, wherein all is equipped with the people's air defense door in access & exit passageway 4, fresh air duct 5, exhaust duct 6, first piston wind channel 7 and second piston wind channel 8 in the portion of digging openly 2.
Illustratively, the bottom of the underground excavated tunnel segment 3 is backfilled with concrete in step S7, and on the premise of meeting the normal use requirement, the backfilled concrete layer 4 is arranged in the vacant space at the bottom of the access passage 4, the new air duct 5, the exhaust duct 6, the first piston air duct 7 and the second piston air duct 8, so as to play a certain anti-floating role and ensure the structural stability of the auxiliary structure of the subway station.
In summary, the embodiment of the invention can fully utilize the construction land of the original open cut structure by arranging the starting well at the position of the open cut part 2, reduce the influence on the trip of peripheral businesses and citizens, do not seal the traffic, do not change the pipeline, have small noise and less dust, effectively eliminate the interference of the construction on the ground traffic, and reduce the early investment of the project; the circular pipe jacking machine can cancel a receiving well by an active shell abandoning mode, reduce the construction cost and save the construction period, and the pipe jacking machine shell 32 can be used as a supporting structure to form a part of the underground excavated tunnel section 3; the circular pipe jacking machine is used for construction, a cutter disc hob and a scraper of the circular pipe jacking machine are arranged to be mutually coordinated, power can be conveyed to the hob in a centralized mode, the cutter disc is large, the thickness, the rigidity and the strength are large, the circular pipe jacking machine can be suitable for terrains in the quaternary strata and rock strata with medium and low compressive strength, the application range is wide, the specifications of the prefabricated pipe sections 31 in all the auxiliary structures are the same, the building scheme is standardized and modularized, the prefabricated tool is unified, and the efficiency is high, cost is low.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (8)
1. A construction method of an auxiliary structure of a subway station is characterized by comprising the following steps:
s1, determining the positions of the auxiliary structures according to the construction drawing;
s2, constructing the open cut parts of the auxiliary structures, and constructing a pipe jacking machine starting well on the open cut parts of the auxiliary structures;
s3, installing the circular pipe jacking machine in place in the originating well;
s4, starting construction by the circular pipe jacking machine along the line axis of the auxiliary structure, and installing the prefabricated pipe sections section by section until all the prefabricated pipe sections are installed and the circular pipe jacking machine jacks to the interface position of the subway station main body; wherein the prefabricated pipe sections of all the auxiliary structures have the same size;
s5, disassembling the circular pipe jacking machine in situ, keeping the shell of the pipe jacking machine in a soil body to serve as a supporting structure, connecting the shell of the pipe jacking machine with the prefabricated pipe joints to form an underground excavated tunnel section, retreating other disassembled parts to an originating well, and then lifting out;
s6, breaking the side wall at the interface position with the auxiliary structure in the subway station main body to communicate the auxiliary structure with the subway station main body;
and S7, constructing a ring beam at the interface position, and finishing the internal structure.
2. A construction method of an auxiliary structure of a subway station as claimed in claim 1, wherein said auxiliary structure comprises an entrance passage and a ventilation passage.
3. A construction method of an auxiliary structure of a subway station as claimed in claim 1, wherein an inner diameter of said prefabricated pipe section is 7 m.
4. A construction method of an auxiliary structure of a subway station as claimed in claim 3, wherein said prefabricated pipe section has a length of 2 m-2.5 m and a wall thickness of 400 mm-500 mm.
5. A construction method of a subway station auxiliary structure as claimed in claim 3, wherein partition walls are constructed in both of the undercut tunnel segment and the open cut portion of said ventilation passage in step S7; the ventilation channel comprises a fresh air channel, an exhaust air channel, a first piston air channel and a second piston air channel, the fresh air channel and the exhaust air channel are arranged in the same underground excavated tunnel section and are separated through a partition wall, and the first piston air channel and the second piston air channel are arranged in the same underground excavated tunnel section and are separated through a partition wall.
6. The construction method of an auxiliary structure of a subway station as claimed in claim 4, wherein said fresh air duct is constructed with a safety exit and a fresh air booth connected with the fresh air duct at the open cut portion, respectively.
7. The method of claim 4, wherein the air exhaust duct is provided with an air exhaust booth at an open cut portion, the first piston air duct is provided with a first piston air booth at the open cut portion, and the second piston air duct is provided with a second piston air booth at the open cut portion.
8. A construction method of a subsidiary structure of a subway station as claimed in claim 5, wherein concrete is backfilled to the bottom of the excavated tunnel section in step S7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011002106.7A CN112228096A (en) | 2020-09-22 | 2020-09-22 | Construction method of auxiliary structure of subway station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011002106.7A CN112228096A (en) | 2020-09-22 | 2020-09-22 | Construction method of auxiliary structure of subway station |
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| CN112228096A true CN112228096A (en) | 2021-01-15 |
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| CN202011002106.7A Pending CN112228096A (en) | 2020-09-22 | 2020-09-22 | Construction method of auxiliary structure of subway station |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203867603U (en) * | 2014-06-04 | 2014-10-08 | 中铁第四勘察设计院集团有限公司 | Smoke control structure in subway station wiring region |
| CN108412500A (en) * | 2018-02-08 | 2018-08-17 | 中铁二院工程集团有限责任公司 | Mountainous City Underground Subway Station vented construction and its construction method |
| CN208040431U (en) * | 2018-03-16 | 2018-11-02 | 中铁第一勘察设计院集团有限公司 | A kind of device preventing subway engineering ventilation smoke exhaust air flow shortcircuit |
| CN110173272A (en) * | 2019-05-26 | 2019-08-27 | 中国建筑第六工程局有限公司 | The method of reseptance of subway station exit and entrance in rectangular pipe jacking machine construction operation |
| CN210713156U (en) * | 2019-07-22 | 2020-06-09 | 中铁第四勘察设计院集团有限公司 | Prefabricated assembled sump pit structure |
-
2020
- 2020-09-22 CN CN202011002106.7A patent/CN112228096A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203867603U (en) * | 2014-06-04 | 2014-10-08 | 中铁第四勘察设计院集团有限公司 | Smoke control structure in subway station wiring region |
| CN108412500A (en) * | 2018-02-08 | 2018-08-17 | 中铁二院工程集团有限责任公司 | Mountainous City Underground Subway Station vented construction and its construction method |
| CN208040431U (en) * | 2018-03-16 | 2018-11-02 | 中铁第一勘察设计院集团有限公司 | A kind of device preventing subway engineering ventilation smoke exhaust air flow shortcircuit |
| CN110173272A (en) * | 2019-05-26 | 2019-08-27 | 中国建筑第六工程局有限公司 | The method of reseptance of subway station exit and entrance in rectangular pipe jacking machine construction operation |
| CN210713156U (en) * | 2019-07-22 | 2020-06-09 | 中铁第四勘察设计院集团有限公司 | Prefabricated assembled sump pit structure |
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Application publication date: 20210115 |