CN113279787A - Construction method for building pipe curtain supporting structure of ultra-shallow buried large-section underground excavation subway station - Google Patents
Construction method for building pipe curtain supporting structure of ultra-shallow buried large-section underground excavation subway station Download PDFInfo
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- CN113279787A CN113279787A CN202110567142.6A CN202110567142A CN113279787A CN 113279787 A CN113279787 A CN 113279787A CN 202110567142 A CN202110567142 A CN 202110567142A CN 113279787 A CN113279787 A CN 113279787A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 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
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
Abstract
The invention relates to a construction method for constructing a pipe curtain supporting structure of an ultra-shallow buried large-section underground excavation subway station. Sequentially jacking a round steel pipe and rectangular steel pipes at the four top corners, and hermetically connecting adjacent rectangular steel pipes through annular latches to form a lateral supporting part and a transverse supporting part; the steel strand penetrates through the lateral and transverse supporting parts, two ends of the steel strand are fixed in the circular steel pipe, the steel strand is tensioned to apply prestress, concrete is filled in the lateral and transverse supporting parts and the circular steel pipe to form a pipe curtain supporting structure, then a pilot tunnel and a center pillar are applied to form an integral supporting system, full-section excavation is carried out, and a top plate, a middle plate, a bottom plate, a side wall and the like of a station are respectively applied. The pipe curtain supporting structure provided by the invention has stronger rigidity and bearing capacity, and concrete does not need to be poured between steel pipes, so that the construction process is simplified; the pipe curtain supporting structure is combined with a hole-pile method, the multi-layer multi-span underground excavation station can be constructed, and the formed rectangular section improves the space utilization rate.
Description
Technical Field
The invention belongs to the technical field of tunnel and underground engineering construction, and particularly relates to a construction method for constructing a multilayer multi-span underground excavation station of a subway by adopting a pipe curtain structure and a hole-pile method during the construction of the subway station.
Background
The pipe curtain construction method is developed and matured after years of domestic research and successful implementation in engineering. The traditional pipe curtain Construction Method has been researched and innovated by many scholars to derive various novel pipe curtain Construction methods, such as NIT Construction Method (New Italian piping Method), TRCM Construction Method (Tubular Roof Construction Method), NTR Construction Method (New Tunnel road of Method), STS Construction Method (Steel Tube Slab Method), etc. The new pipe curtain construction methods all obtain certain engineering application value, but have some defects, such as poor steel bar binding operation condition in a steel pipe required by an NIT construction method, a TRCM construction method and an NTR construction method, more steel pipe cuts and welding seams and certain influence on waterproof quality. The reinforcing work of the STS construction method is very complicated and has certain difficulty in controlling the quality. The shallow excavation construction that buries is mainly adopted during domestic station undercut, and the station top generally is the arch structure, and space utilization is low, and mainly adopts double-deck vault vertical wall structure, and in order to reduce the risk, the general design of station is two-layer and buries the depth and usually does not exceed 7 m. At present, the engineering cases of underground excavation construction of three-layer or more than three-layer station structures in an ultra-shallow buried stratum are few, and the construction method for safely and effectively constructing the multi-layer and multi-span underground excavation station has very important practical significance.
Disclosure of Invention
Aiming at the defects of the existing pipe curtain construction method and the construction technology of the underground excavated station, the invention provides the construction method for constructing the pipe curtain supporting structure of the ultra-shallow underground large-section underground excavated subway station, which can effectively improve the transverse rigidity and the bearing capacity of a pipe curtain supporting system, obviously reduce the burial depth of the station, reduce the construction cost, and realize zero disturbance to ground traffic and surrounding structures.
The technical scheme for realizing the aim of the invention is to provide a construction method for constructing a pipe curtain supporting structure of an ultra-shallow buried large-section underground excavated subway station, which comprises the following steps of firstly constructing a working well, installing a device for jacking a steel pipe in the working well, and then constructing:
(1) prefabricating a round steel pipe and a rectangular steel pipe: a pair of annular lock catches are respectively arranged on two sides of the rectangular steel pipe; a plurality of through holes at four corners are arranged on the pipe wall at one side of the round steel pipe and the pipe walls at two sides of the rectangular steel pipe in an axially equidistant segmentation manner;
(2) taking the prefabricated round steel pipes as four vertex angles, and sequentially jacking through a pipe jacking machine according to the designed positions; the rectangular steel pipes are sequentially jacked between the circular steel pipes on the two sides and between the circular steel pipes with the upper ends in the horizontal direction through a pipe jacking machine respectively, adjacent steel pipes are connected in a sealing mode through annular lock catches to form rectangular cavities, and the rectangular steel pipes and the rectangular cavities are connected in sequence to form a lateral supporting portion and a transverse supporting portion respectively;
(3) respectively penetrating a steel strand through a lateral supporting part and a transverse supporting part through a through hole, fixing two ends of the steel strand in a circular steel pipe through a fixing device, applying prestress on a tensile steel strand, and filling concrete in the lateral supporting part, the transverse supporting part and the circular steel pipe;
(4) after the concrete reaches the design strength, performing main body construction under the formed pipe curtain supporting structure;
(5) respectively excavating an upper pilot tunnel and a lower pilot tunnel, and simultaneously supporting each pilot tunnel;
(6) constructing a bottom longitudinal beam and a waterproof layer in the lower pilot tunnel, constructing a top longitudinal beam and a waterproof layer in the upper pilot tunnel, and constructing a steel pipe column to form an integral supporting system;
(7) excavating a negative layer of mid-span soil, excavating a side-span soil body at the same time, dismantling an upper pilot tunnel structure, and constructing a negative layer of top plate and side wall structure;
(8) continuing to excavate the earthwork downwards to the position of the negative layer middle plate, laying a side wall waterproof layer, and pouring the negative layer middle plate structure and the side wall structure to complete the negative layer two-lining structure;
(9) excavating the layered plates to the designed elevation in sequence, and finishing the pouring of the remaining waterproof structures and the secondary lining structures according to the step (8);
(10) after the middle slab concrete reaches the design strength, excavating to the design elevation of the bottom slab, and chiseling the lower pilot tunnel concrete; constructing a station bottom plate at the middle part of the low longitudinal beam;
(11) after the construction of the mid-span structure bottom plate is completed and reaches 75% of the design strength, earth in the side span range is excavated to the lower part of the bottom plate in a segmenting and jumping way, and a cushion layer, a waterproof layer and a structure bottom plate are constructed;
(12) and after the strength of the bottom plate concrete reaches 75% of the design strength, constructing the residual waterproof layer and the underground two-layer structure side wall, and then constructing internal auxiliary facilities to complete the station construction.
The invention relates to a construction method for constructing a pipe curtain supporting structure of an ultra-shallow buried large-section underground excavation subway station, wherein the width of a rectangular cavity of a pipe curtain support is the same as that of a rectangular steel pipe; the arrangement distance of the steel strands along the axial direction of the rectangular steel pipe is 0.5-1 m; the concrete filled in the supporting part and the round steel pipe is superfluid self-compacting concrete.
The invention provides a pipe curtain support construction method for constructing an ultra-shallow buried large-section underground excavation subway station.
The support system provided by the invention makes up the limitations and the defects of the existing pipe curtain construction method and station construction, and has the beneficial effects of:
1. compared with the traditional lock catch and steel plate connection mode, the bearing capacity of the steel pipe group is increased by applying prestress on the steel strands, and the number of cuts and welding seams inside the steel pipe is greatly reduced.
2. The holes of the embedded steel strands can be prefabricated, operation in narrow and small space in the pipe is effectively avoided, and construction efficiency is improved.
3. Compared with the prior art which adopts round steel pipes, the middle part of the invention adopts the rectangular steel pipes, so that the contact area between the steel pipes can be effectively increased, no inter-pipe grouting is needed, and the transverse rigidity and the bearing capacity are greatly improved; can obviously reduce the station burial depth and reduce the construction cost.
4. The underground excavation station is constructed to be a rectangular section, the space utilization rate is greatly improved, and the underground excavation station can be used for ultra-shallow buried engineering.
5. The pipe curtain structure provided by the invention can be used for building multilayer multi-span underground excavated stations of subways by combining the hole pile method and can realize zero disturbance to ground traffic and surrounding structures.
Drawings
FIG. 1 is a schematic view of a tube sheet supporting structure provided by an embodiment of the present invention;
FIG. 2 is a schematic view of the embodiment of the present invention used for the lap joint of the circular lock catches between the rectangular steel pipes;
FIG. 3 is a schematic structural diagram of a rectangular steel tube and an annular lock according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a fixing device for fixing a steel strand inside a circular steel roof according to an embodiment of the invention;
fig. 5 to 9 are schematic views of the working procedures of the station excavation part provided in this embodiment in sequence;
FIG. 10 is a construction diagram of a pipe curtain structure combined with a hole-pile method for building a multi-layer and multi-span underground excavation station of a subway provided by an embodiment of the invention;
in the figure: 1. a circular steel pipe; 2. a rectangular steel pipe; 3. an annular lock catch; 4. steel strand wires; 5. a fixing device; 6. concrete; 7, upper pilot tunnel; 8. a lower pilot tunnel; 9. a top stringer; 10. a bottom stringer; 11. steel pipe columns; 12. a middle plate; 13. a base plate; 14. a rectangular cavity.
Detailed Description
The technical scheme of the invention is further elaborated by combining the drawings and the embodiments.
Example 1
The invention discloses a pipe curtain supporting structure based on connection of prestressed steel strands and annular lock catches, which is used for building an ultra-shallow buried large-section underground excavation subway station.
Referring to fig. 1, which is a schematic view of a pipe curtain supporting structure provided in this embodiment, the pipe curtain supporting structure mainly includes a supporting portion, a circular steel pipe and a steel strand, the supporting portion is a lateral supporting portion vertically disposed at two sides and a transverse supporting portion horizontally disposed between the lateral supporting portions, the circular steel pipes 1 are respectively disposed at the top and the bottom of the lateral supporting portion, and the circular steel pipes disposed at the top of the lateral supporting portion are respectively connected with two ends of the transverse supporting portion; the transverse supporting part and the lateral supporting part are respectively formed by connecting a plurality of rectangular steel pipes 2 and rectangular cavities 14, a pair of annular latches 3 are respectively arranged on two sides of each rectangular steel pipe 2, and adjacent rectangular steel pipes are hermetically connected through the annular latches 3 to form the rectangular cavities 14; a plurality of pairs of through holes are axially and sectionally arranged on the pipe walls at two sides of the rectangular steel pipe, the prestressed steel strand 4 respectively penetrates through the lateral supporting part and the transverse supporting part through the through holes, and two ends of the steel strand are fixed in the round steel pipe by a fixing device 5; concrete 6 is filled in the rectangular steel pipe, the rectangular cavity and the round steel pipe of the supporting part. In this embodiment, the width of rectangular cavity is the same with the width of rectangular steel pipe, and the concrete of filling is superfluid self-compaction concrete. In general, the arrangement distance of the steel strands along the axial direction of the rectangular steel pipe is 0.5-1 m, and the specific distance range can be set according to actual engineering requirements; the prestress applied to the steel strand is not more than 0.7 times of the ultimate strength of the steel strand, and the specific numerical value is designed according to the actual engineering requirement.
Referring to FIG. 2, it is a schematic diagram of the present embodiment for the lap joint of the circular lock catches between the steel pipes; referring to fig. 3, it is a schematic structural diagram of the rectangular steel tube and the annular lock catch provided in this embodiment; as can be seen from fig. 2 and 3, a pair of matched annular latches 3 are respectively fixed on two sides of a rectangular steel pipe 2, adjacent steel pipes are hermetically connected through the annular latches 3 to form a rectangular cavity 14, and a transverse support part and a lateral support part are respectively formed by connecting a plurality of rectangular steel pipes 2 and the rectangular cavity 14; both ends of the transverse supporting part are connected with the round steel pipe 1.
Referring to fig. 4, it is a schematic structural diagram of the fixing device for fixing the steel strand inside the circular steel roof provided in this embodiment. The steel strands 4 respectively penetrating through the transverse supporting part and the lateral supporting part are fixed in the round steel pipe 1 by a fixing device 5.
By adopting the pipe curtain supporting structure provided by the embodiment to realize underground excavation of a station as an example, the adopted technical scheme comprises the following steps:
(1) constructing a working well, and installing a device for jacking the steel pipe in the working well;
(2) prefabricating a round steel pipe and a rectangular steel pipe: a pair of annular lock catches are respectively arranged on two sides of the rectangular steel pipe; a plurality of prefabricated through holes are axially and equidistantly arranged on the pipe wall on one side of the round steel pipe and the pipe walls on the two sides of the rectangular steel pipe in a segmented manner;
(3) taking the prefabricated round steel pipes as four vertex angles, and sequentially jacking through a pipe jacking machine according to the designed positions; between the round steel pipes on the two sides and between the round steel pipes in the horizontal direction, rectangular steel pipes are sequentially jacked in through a pipe jacking machine respectively, adjacent steel pipes are hermetically connected through an annular lock catch to form a rectangular cavity, and a plurality of rectangular steel pipes are sequentially connected with the rectangular cavity to form a lateral supporting part and a transverse supporting part respectively;
(4) respectively penetrating a steel strand through a lateral supporting part and a transverse supporting part through a through hole, fixing two ends of the steel strand in a circular steel pipe through a fixing device, applying prestress on a tensile steel strand, and filling concrete in the lateral supporting part, the transverse supporting part and the circular steel pipe;
(5) and after the concrete reaches the designed strength, performing main body construction under the formed pipe curtain supporting structure.
Referring to fig. 5, 6, 7, 8 and 9, schematic diagrams of the working procedure of the station excavation part provided in this embodiment are shown in sequence; the main body construction comprises the following specific steps:
(1) referring to fig. 5, excavating an upper pilot tunnel 7 and a lower pilot tunnel 8 respectively, and supporting each pilot tunnel at the same time;
(2) referring to the attached figure 6, a bottom longitudinal beam 10 and a waterproof layer are constructed in a lower pilot tunnel, a top longitudinal beam 9 and a waterproof layer are constructed in an upper pilot tunnel, and then a steel pipe column 11 is constructed to form an integral supporting system;
(3) referring to the attached figure 7, firstly excavating a negative layer of mid-span soil, excavating a side-span soil body, dismantling an upper pilot tunnel structure, and constructing a negative layer of top plate and side wall structure;
(4) continuing to excavate the earthwork downwards to the position of the negative layer middle plate 12, laying a side wall waterproof layer, and pouring the negative layer middle plate structure and the side wall structure to complete the negative layer two-lining structure, referring to the attached figure 8;
(5) referring to the attached drawing 9, the designed elevation of the layered plate is excavated downwards in sequence, and the pouring of the remaining waterproof and secondary lining structures of each layer is completed according to the step (4);
(6) after the middle slab concrete reaches the design strength, excavating to the design elevation of the bottom slab, and chiseling the lower pilot tunnel concrete; constructing a station bottom plate at the middle part of the low longitudinal beam;
(7) after the construction of the mid-span structure bottom plate is completed and reaches 75% of the design strength, earth in the side span range is excavated to the lower part of the bottom plate in a segmenting and jumping way, and a cushion layer, a waterproof layer and a structure bottom plate are constructed;
(8) referring to fig. 10, the pipe curtain structure provided by this embodiment is used in constructing a multi-layer and multi-span underground excavated station of a subway, and after the strength of concrete of a bottom plate 13 reaches 75% of the design strength, the remaining waterproof layer and the side walls of the underground double-layer structure are applied, and then the internal auxiliary facilities are applied to complete the station construction.
Claims (5)
1. A construction method for constructing a pipe curtain supporting structure of an ultra-shallow buried large-section underground excavation subway station is used for constructing a working well, and a device for jacking a steel pipe is installed in the working well, and is characterized by further comprising the following steps of:
(1) prefabricating a round steel pipe (1) and a rectangular steel pipe (2): a pair of annular lock catches (3) are respectively arranged on two sides of the rectangular steel pipe; a plurality of through holes at four corners are arranged on the pipe wall at one side of the round steel pipe and the pipe walls at two sides of the rectangular steel pipe in an axially equidistant segmentation manner;
(2) taking the prefabricated round steel pipes as four vertex angles, and sequentially jacking through a pipe jacking machine according to the designed positions; between the round steel pipes on the two sides and between the round steel pipes at the upper end in the horizontal direction, rectangular steel pipes are sequentially jacked in through a pipe jacking machine respectively, adjacent steel pipes are hermetically connected through an annular lock catch to form a rectangular cavity (14), and a plurality of rectangular steel pipes are sequentially connected with the rectangular cavity to form a lateral supporting part and a transverse supporting part respectively;
(3) respectively penetrating a steel strand (4) through a lateral supporting part and a transverse supporting part through a through hole, fixing two ends of the steel strand in a circular steel pipe through a fixing device (5), applying prestress on a tensile steel strand, and filling concrete (6) in the lateral supporting part, the transverse supporting part and the circular steel pipe;
(4) after the concrete reaches the design strength, performing main body construction under the formed pipe curtain supporting structure;
(5) respectively excavating an upper pilot tunnel (7) and a lower pilot tunnel (8), and simultaneously supporting each pilot tunnel;
(6) constructing a bottom longitudinal beam (10) and a waterproof layer in the lower pilot tunnel, constructing a top longitudinal beam (9) and a waterproof layer in the upper pilot tunnel, and constructing a steel pipe column (11) to form an integral supporting system;
(7) excavating a negative layer of mid-span soil, excavating a side-span soil body at the same time, dismantling an upper pilot tunnel structure, and constructing a negative layer of top plate and side wall structure;
(8) continuing to excavate the earthwork downwards to the position of the negative layer middle plate (12), laying a side wall waterproof layer, and pouring the negative layer middle plate structure and the side wall structure to complete the negative layer two-lining structure;
(9) excavating the layered plates to the designed elevation in sequence, and finishing the pouring of the remaining waterproof structures and the secondary lining structures according to the step (8);
(10) after the middle slab concrete reaches the design strength, excavating to the design elevation of the bottom slab (13), and chiseling the lower pilot tunnel concrete; constructing a station bottom plate at the middle part of the low longitudinal beam;
(11) after the construction of the mid-span structure bottom plate is completed and reaches 75% of the design strength, earth in the side span range is excavated to the lower part of the bottom plate in a segmenting and jumping way, and a cushion layer, a waterproof layer and a structure bottom plate are constructed;
(12) and after the strength of the bottom plate concrete reaches 75% of the design strength, constructing the residual waterproof layer and the underground two-layer structure side wall, and then constructing internal auxiliary facilities to complete the station construction.
2. The construction method for constructing the pipe curtain supporting structure of the ultra-shallow buried large-section underground excavated subway station as claimed in claim 1, wherein: the width of the rectangular cavity is the same as that of the rectangular steel pipe.
3. The construction method for constructing the pipe curtain supporting structure of the ultra-shallow buried large-section underground excavated subway station as claimed in claim 1, wherein: the arrangement distance of the steel strands along the axial direction of the rectangular steel pipe is 0.5-1 m.
4. The construction method for constructing the pipe curtain supporting structure of the ultra-shallow buried large-section underground excavated subway station as claimed in claim 1, wherein: the concrete filled in the supporting part and the round steel pipe is superfluid self-compacting concrete.
5. The construction method for constructing the pipe curtain supporting structure of the ultra-shallow buried large-section underground excavated subway station as claimed in claim 1, wherein: the constructed subway station has a rectangular section.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110567142.6A CN113279787A (en) | 2021-05-24 | 2021-05-24 | Construction method for building pipe curtain supporting structure of ultra-shallow buried large-section underground excavation subway station |
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| CN202110567142.6A CN113279787A (en) | 2021-05-24 | 2021-05-24 | Construction method for building pipe curtain supporting structure of ultra-shallow buried large-section underground excavation subway station |
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| CN103244143A (en) * | 2013-05-27 | 2013-08-14 | 中铁工程设计咨询集团有限公司 | Underground engineering tunneling construction method and underground station |
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| CN105464675A (en) * | 2016-02-01 | 2016-04-06 | 北京首尔工程技术有限公司 | Novel surface contact pipe curtain structure and construction method thereof |
| CN108049891A (en) * | 2017-12-08 | 2018-05-18 | 东北大学 | For building the rectangular steel pipe support system of underground engineering with shallow and its construction method |
| CN109555535A (en) * | 2017-09-27 | 2019-04-02 | 上海同吉建筑工程设计有限公司 | The purlin Xia Lu form prestressed pipe curtain structure and construction method |
| CN109555540A (en) * | 2017-09-27 | 2019-04-02 | 上海同吉建筑工程设计有限公司 | Tunnel form prestressed pipe curtain structure and construction method |
| CN111636897A (en) * | 2020-06-18 | 2020-09-08 | 上海隧道工程有限公司 | Bundle pipe curtain structure and construction method thereof |
| US20200291597A1 (en) * | 2019-08-08 | 2020-09-17 | Infrastructure Renewal Institute of Southern China | Assembled recyclable rectangular working well with preset detachable door opening and construction method thereof |
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2021
- 2021-05-24 CN CN202110567142.6A patent/CN113279787A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103244143A (en) * | 2013-05-27 | 2013-08-14 | 中铁工程设计咨询集团有限公司 | Underground engineering tunneling construction method and underground station |
| CN103321659A (en) * | 2013-07-22 | 2013-09-25 | 中铁隧道集团有限公司 | Large-diameter tube curtain support underground excavation construction super-shallow burying large-section subway station structure and construction method |
| CN105464675A (en) * | 2016-02-01 | 2016-04-06 | 北京首尔工程技术有限公司 | Novel surface contact pipe curtain structure and construction method thereof |
| CN109555535A (en) * | 2017-09-27 | 2019-04-02 | 上海同吉建筑工程设计有限公司 | The purlin Xia Lu form prestressed pipe curtain structure and construction method |
| CN109555540A (en) * | 2017-09-27 | 2019-04-02 | 上海同吉建筑工程设计有限公司 | Tunnel form prestressed pipe curtain structure and construction method |
| CN108049891A (en) * | 2017-12-08 | 2018-05-18 | 东北大学 | For building the rectangular steel pipe support system of underground engineering with shallow and its construction method |
| US20200291597A1 (en) * | 2019-08-08 | 2020-09-17 | Infrastructure Renewal Institute of Southern China | Assembled recyclable rectangular working well with preset detachable door opening and construction method thereof |
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