CN112943265A - Subway pole-free station structure adopting primary arch cover method and construction method - Google Patents
Subway pole-free station structure adopting primary arch cover method and construction method Download PDFInfo
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- CN112943265A CN112943265A CN202110259954.4A CN202110259954A CN112943265A CN 112943265 A CN112943265 A CN 112943265A CN 202110259954 A CN202110259954 A CN 202110259954A CN 112943265 A CN112943265 A CN 112943265A
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- 238000010276 construction Methods 0.000 title claims abstract description 101
- 238000000034 method Methods 0.000 title claims abstract description 54
- 238000009412 basement excavation Methods 0.000 abstract description 9
- 238000005034 decoration Methods 0.000 abstract description 3
- 230000035699 permeability Effects 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 239000011435 rock Substances 0.000 description 8
- 238000011161 development Methods 0.000 description 3
- 239000011440 grout Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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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
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- 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
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- 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
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
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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
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
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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
- E21F16/00—Drainage
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- Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
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- Geochemistry & Mineralogy (AREA)
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Abstract
The invention provides a primary arch cover method subway pillarless station structure which comprises a station hall layer A and a station platform layer B, wherein the station hall layer A and the station platform layer B are separated by a horizontal middle plate, a primary arch cover is arranged at the arch top of the station hall layer A, an arch part secondary lining is arranged on the lower surface of the primary arch cover, a side wall secondary lining is arranged on the side wall of the station platform layer B, and an inverted arch secondary lining is arranged at the bottom of the station platform layer B. According to the invention, the tunnel excavation is completed by using the primary support arch cover method, the secondary station lining is constructed by adopting a sequential method from bottom to top, a central column system of the station and a rail top air duct system of a station layer with higher construction difficulty are eliminated, the building layout is facilitated, the station space is increased, the decoration apparent permeability is improved, the construction step sequence is optimized, the construction process is simplified, the construction efficiency is improved, and the construction quality is effectively ensured.
Description
Technical Field
The invention relates to the technical field of subway construction, in particular to a pillar-free subway station structure adopting a primary arch cover method and a construction method.
Background
At present, rail transit such as subway becomes one of the main development directions of the modern city construction of our country, and is also one of the important development fields of new capital construction. The buried depth of bedrocks in many urban areas is higher and higher, so that the problems of pipeline relocation, greening migration, traffic jam and the like caused by conventional open excavation or cover excavation construction are solved, and the use frequency of a large-span underground excavation construction method for urban rail transit is higher and higher; limited by the buried depth of a line and the lifting height of a station building, a major structure of a large-span underground excavation tunnel is located in a rock stratum with a soft upper part and a hard lower part, namely a vault is located in strongly weathered and moderately weathered rocks, a vault foot is located in moderately weathered or slightly weathered rocks, and a major part of the major structure is located in moderately weathered and slightly weathered rocks.
The traditional construction method of the large-span underground excavation tunnel comprises a double-side-wall pit guiding method, a hole pile (column) method and the like, for example, the invention with the application number of 201710188769.4 is applied, but with the development of the underground excavation technology, an initial support arch cover method which is integrated with the design concept of an arch bridge and a subway cover excavation sequential construction method is adopted in the subway construction of a plurality of cities on a large scale. At present, the arch cover method station room layer of just propping up adopts the domes of no center pillar, and the platform layer is because the atress needs to adopt the beam column structure system that has the center pillar, and the center pillar on station platform layer has great influence to the architectural function and the decorative effect of station, is unfavorable for building layout, and subway station all adopts simultaneously to set up rail top wind channel environmental control system, and no matter the rail top wind channel is with two lining structure in the same period pouring or the secondary pouring, all has the condition of construction difficulty.
Disclosure of Invention
The invention aims to solve the technical problem of providing a post-free subway station structure adopting an arch cover primary support method and a construction method, and the post-free subway station structure and the construction method can be used for eliminating a central post system and a rail top air duct system in a station, reducing the construction difficulty and improving the construction efficiency.
The technical scheme adopted by the invention for solving the technical problems is as follows: the construction method of the subway pillarless station by the primary arch cover method comprises the following steps:
A. completing the construction of a primary support arch cover by using a primary support arch cover method, and excavating an upper half tunnel;
B. excavating a lower half-section tunnel under the support of the primary support arch cover;
C. constructing an inverted arch secondary lining on the lower half-section tunnel by adopting a forward method;
D. constructing a second side wall lining by adopting a sequential method;
E. the construction of the middle plate is completed at one time by adopting a sequential method;
F. the construction of the arch part secondary lining is completed at one time by adopting the sequential method.
Further, in step a, the cross section of the upper half tunnel is divided into a plurality of regions, and after the construction of the upper region is completed, the construction of the lower region is performed.
Further, in the step a, the section of the upper half tunnel is divided into an upper area, a lower area, a left area and a right area, the upper area and the lower area are located between the left area and the right area, the top surfaces of the upper area, the left area and the right area are the vault of the upper half tunnel, the construction of the upper area is firstly carried out, then the construction of the left area and the right area is carried out simultaneously, and finally the construction of the lower area is carried out.
Further, in the step B, the section of the lower half-section tunnel is divided into a plurality of areas, and the construction of the lower area is carried out after the construction of the upper area is finished.
Further, in step B, the section of the lower half-section tunnel is divided into an upper layer, a middle layer and a lower layer which are arranged from top to bottom, the upper layer, the middle layer and the lower layer are divided into a first area, a second area and a third area, the first area, the second area and the third area are all trapezoidal, the width of the top surface of the second area is larger than that of the bottom surface, the first area and the third area are symmetrically arranged relative to the second area, during construction, construction of the upper second area is firstly performed, construction of the upper first area and the third area is simultaneously performed, construction of the middle second area is performed, construction of the middle first area and the third area is performed simultaneously, construction of the lower second area is performed finally, and construction of the lower first area and the third area is performed simultaneously.
Further, the upper, middle and lower layers are of uniform thickness.
Further, the third regions of the upper layer, the middle layer and the lower layer are trapezoidal as a whole.
The primary arch cover method subway column-free station structure adopting the primary arch cover method subway column-free station construction method comprises a station hall layer A and a station layer B, wherein the station hall layer A and the station layer B are separated by a horizontal middle plate, a primary arch cover is arranged at the arch top of the station hall layer A, a secondary arch part lining is arranged on the lower surface of the primary arch cover, a secondary side wall lining is arranged on the side wall of the station layer B, and a secondary inverted arch lining is arranged at the bottom of the station layer B.
Further, a waterproof layer is arranged on the lower surface of the inverted arch secondary lining.
Further, the thickness of the arch foot of the primary support arch cover is larger than that of the arch top.
The invention has the beneficial effects that: according to the invention, the tunnel excavation is completed by using the primary support arch cover method, the secondary station lining is constructed by adopting a sequential method from bottom to top, a central column system of the station and a rail top air duct system of a station layer with higher construction difficulty are eliminated, the building layout is facilitated, the station space is increased, the decoration apparent permeability is improved, the construction step sequence is optimized, the construction process is simplified, the construction efficiency is improved, and the construction quality is effectively ensured.
Drawings
FIGS. 1 to 6 are schematic views of the construction of the present invention;
FIG. 7 is a schematic structural diagram of a subway pillarless station of the present invention;
FIG. 8 is a schematic view of an anchor cable;
reference numerals: the station hall layer A, the station layer B, the upper half-section tunnel a, the lower half-section tunnel B, the primary support arch cover 1, the inverted arch secondary lining 21, the side wall secondary lining 22, the middle plate 23, the arch secondary lining 24, the rod body 3, the central blind hole 31, the water delivery blind hole 32, the overflow hole 33 and the water seepage hole 34.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The invention relates to a method for constructing a subway pillarless station by a primary arch cover method, which comprises the following steps of:
A. the construction of the arch cover 1 is completed by the arch cover method of primary support, and the upper half tunnel a is excavated as shown in fig. 1. Specifically, the cross section of the upper half tunnel a is divided into a plurality of areas, and after the construction of the upper area is completed, the construction of the lower area is performed. Because the subway station is generally wider, the upper half tunnel a is firstly divided into a plurality of areas, and then each area is constructed from top to bottom in sequence, so that the construction safety can be ensured.
Further, the section of the upper half tunnel a is divided into an upper area, a lower area, a left area and a right area, the upper area and the lower area are located between the left area and the right area, the top surfaces of the upper area, the left area and the right area are the vault of the upper half tunnel a, the construction of the upper area is firstly carried out, then the construction of the left area and the right area is carried out simultaneously, and finally the construction of the lower area is carried out.
B. Under the support of the primary support arch cover 1, excavating a lower half-section tunnel b, as shown in figure 2; specifically, the section of the lower half-section tunnel b is divided into a plurality of areas, and the construction of the lower area is performed after the construction of the upper area is completed.
In the step B, the section of the lower half-section tunnel B is divided into an upper layer, a middle layer and a lower layer which are arranged from top to bottom, the upper layer, the middle layer and the lower layer are equally divided into a first area, a second area and a third area, the thicknesses of the upper layer, the middle layer and the lower layer are consistent, and the whole third area of the upper layer, the middle layer and the lower layer is trapezoidal. The first region, the second region and the third region are all trapezoidal, the width of the top surface of the second region is larger than that of the bottom surface, the first region and the third region are symmetrically arranged relative to the second region, during construction, construction of the upper second region is firstly carried out, construction of the upper first region and the third region is carried out simultaneously, construction of the middle second region is then carried out, construction of the middle first region and the third region is carried out simultaneously, construction of the lower second region is finally carried out, and construction of the lower first region and the third region is carried out simultaneously.
Because the degree of depth of half section tunnel b down is greater than the degree of depth of half tunnel a, consequently divide into the three-layer with half section tunnel b down, from last to constructing gradually down, reduce the construction degree of difficulty, and the first region and the third region of one deck are under construction simultaneously, can improve the efficiency of construction. The second area is set to be an isosceles trapezoid, the top edge of the second area is wider than the bottom edge of the second area, two side faces of the second area are inclined planes after construction, stability is good, soil and stones on two sides of the second area can be prevented from collapsing to influence construction progress, and construction safety is guaranteed.
C. In order to prevent the groundwater from leaking from the lower part of the tunnel b, the second inverted arch liner 21 is constructed in a forward manner, and as shown in fig. 3, a waterproof layer may be provided under the second inverted arch liner 21, or drainage ditches may be provided at both ends of the second inverted arch liner 21.
D. The construction of the side wall secondary lining 22 is carried out by adopting the sequential method, as shown in fig. 4;
E. the construction of the middle plate 23 is completed at one time by adopting a sequential method, as shown in fig. 5;
F. the construction of the arch part secondary lining 24 is finished at one time by adopting the sequential method, as shown in figure 6.
The construction is carried out from bottom to top in a sequential way, so that the stability of the second inverted arch lining 21, the second side wall lining 22, the middle plate 23 and the second arch lining 24 is ensured, and the construction efficiency is high.
According to the invention, the construction of the station main body is firstly carried out from top to bottom by adopting an arch cover method, and then the construction of the inverted arch secondary lining 21, the side wall secondary lining 22, the middle plate 23 and the arch part secondary lining 24 is carried out from bottom to top by utilizing a forward method, so that a station central column system and a station layer rail top air duct system with higher construction difficulty are not required to be constructed, the building layout is facilitated, the station space is increased, the decoration apparent permeability is improved, the construction step sequence is optimized, the construction process is simplified, the construction efficiency is improved, and the construction quality is effectively ensured.
The primary arch cover method subway column-free station structure adopting the primary arch cover method subway column-free station construction method comprises a station hall layer A and a station platform layer B, wherein the station hall layer A and the station platform layer B are separated by a horizontal middle plate 23, a primary arch cover 1 is arranged at the arch top of the station hall layer A, an arch part secondary lining 24 is arranged on the lower surface of the primary arch cover 1, a side wall secondary lining 22 is arranged on the side wall of the station platform layer B, and an inverted arch secondary lining 21 is arranged at the bottom of the station platform layer B, as shown in fig. 7.
The lower surface of the second inverted arch lining 21 is provided with a waterproof layer which plays a waterproof role, so that underground water is prevented from permeating into the second inverted arch lining 21, and the service life of the second inverted arch lining 21 is prolonged.
The arch springing of the primary arch cover 1 is supported by rock strata, and the thickness of the arch springing of the primary arch cover 1 is larger than that of the arch top, so that the supporting strength of the primary arch cover 1 can be improved, and the safety is improved. In addition, in order to ensure the stability of the primary support grid and lead and discharge fracture water in the stratum, anchor cables 3 can be arranged on the arch part and the side walls, one ends of the anchor cables are driven into the rock stratum, and the other ends of the anchor cables are connected with the primary support grid. The anchor cable can adopt a solid rod member and the like, and can also be a hollow rod member, and concrete is injected into the hollow rod member after the hollow rod member is driven into the rock stratum. In order to prevent the water seepage of the side wall and the rock stratum at the arch top of the station, a hollow rod with a hydrophobic function can be used as an anchor cable, as shown in fig. 8, the hollow rod comprises a rod body 3, the rod body 3 is provided with a central blind hole 31, a plurality of water delivery blind holes 32 are arranged around the central blind hole 31, and the side wall of the rod body 3 is provided with a plurality of overflow holes 33 communicated with the central blind hole 31 and a plurality of water seepage holes 34 communicated with the water delivery blind holes 32. During the construction, squeeze into the body of rod 3 slope in the stratum of side wall and vault, and the drill way of overflow hole 33 is down, then pour into central blind hole 31 with grout, grout is full of behind the central blind hole 31 and flows outside the body of rod 3 through overflow hole 33, the grout of flowing out directly contacts with the stratum, can strengthen the joint strength of the body of rod 3 and stratum after the drying, and then improve the stability of strutting, and simultaneously, crack water accessible infiltration hole 34 in the stratum gets into water delivery blind hole 32, discharge outside the body of rod 3 along water delivery blind hole 32 again, can play the effect of drainage. Therefore, the anchor cable not only has the reinforcing function, but also has the drainage function, and can effectively improve the stability and the safety of the second arch part lining 24 and the second side wall lining 22.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The construction method of the subway pillarless station by the primary arch cover method is characterized by comprising the following steps:
A. completing the construction of a primary arch cover (1) by using a primary arch cover method, and excavating an upper half tunnel (a);
B. excavating a lower half-section tunnel (b) under the support of the primary support arch cover (1);
C. the construction of an inverted arch secondary lining (21) is carried out on the lower half-section tunnel (b) by adopting a forward method;
D. the construction of a second side wall lining (22) is carried out by adopting a sequential method;
E. the construction of the middle plate (23) is completed at one time by adopting a sequential method;
F. the construction of the second liner (24) of the arch part is finished at one time by adopting the sequential method.
2. A method of constructing a pillarless station for a subway by a primary arch cover method as claimed in claim 1, wherein in the step a, the cross section of the upper half tunnel (a) is divided into a plurality of regions, and the construction of the lower region is performed after the construction of the upper region is completed.
3. A method for constructing a no-post station of a subway by a primary arch cover method as claimed in claim 2, wherein in the step a, the section of the upper half tunnel (a) is divided into an upper area, a lower area, a left area and a right area, the upper area and the lower area are located between the left area and the right area, the top surfaces of the upper area, the left area and the right area are the arch tops of the upper half tunnel (a), the construction of the upper area is performed first, the construction of the left area and the right area is performed simultaneously, and the construction of the lower area is performed finally.
4. A method for constructing a pillarless station of a subway by a primary arch cover method as claimed in claim 1, wherein in the step B, the section of the lower half-section tunnel (B) is divided into a plurality of areas, and the construction of the lower area is performed after the construction of the upper area is completed.
5. The method for constructing a no-column station of a subway of the primary arch cover method as claimed in claim 4, in the step B, the section of the lower half-section tunnel (B) is divided into an upper layer, a middle layer and a lower layer which are arranged from top to bottom, the upper layer, the middle layer and the lower layer are divided into a first area, a second area and a third area, the first area, the second area and the third area are all in a trapezoid shape, the width of the top surface of the second area is larger than that of the bottom surface, the first area and the third area are symmetrically arranged relative to the second area, when in construction, the construction of the second area on the upper layer is firstly carried out, and then the construction of the first area and the third area on the upper layer is carried out simultaneously, and then, constructing the middle layer second area, constructing the middle layer first area and the third area at the same time, constructing the lower layer second area, and constructing the lower layer first area and the third area at the same time.
6. The construction method of a preliminary bracing arch cover method subway pillarless station as claimed in claim 5, wherein the thickness of the upper layer, the middle layer and the lower layer are uniform.
7. The construction method of a preliminary bracing arch cover method subway pillarless station as claimed in claim 5, wherein the third areas of the upper, middle and lower floors are entirely trapezoidal.
8. The structure of the primary arch cover method subway pillarless station using the construction method of the primary arch cover method subway pillarless station as claimed in claims 1 to 7, characterized by comprising a station hall layer A and a station platform layer B, wherein the station hall layer A and the station platform layer B are separated by a horizontal middle plate (23), the arch crown of the station hall layer A is provided with the primary arch cover (1), the lower surface of the primary arch cover (1) is provided with an arch part secondary lining (24), the side wall of the station platform layer B is provided with a side wall secondary lining (22), and the bottom of the station platform layer B is provided with an inverted arch secondary lining (21).
9. The primary arch cover method subway pillarless station structure as claimed in claim 8, wherein a waterproof layer is provided on a lower surface of said inverted arch secondary lining (21).
10. The preliminary arch cover method subway pillarless station structure as claimed in claim 8, wherein the thickness of said preliminary arch cover (1) at the arch foot is greater than the thickness at the arch top.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110259954.4A CN112943265A (en) | 2021-03-10 | 2021-03-10 | Subway pole-free station structure adopting primary arch cover method and construction method |
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| CN202110259954.4A CN112943265A (en) | 2021-03-10 | 2021-03-10 | Subway pole-free station structure adopting primary arch cover method and construction method |
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| 黄斐等: "基于拱部CD 法修筑的土岩复合地层双层初期支护拱盖法隧道结构稳定性研究", 《现代隧道技术》 * |
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Application publication date: 20210611 |