CN112031807A - Variable-section supporting structure of station tunnel and construction method of station tunnel - Google Patents
Variable-section supporting structure of station tunnel and construction method of station tunnel Download PDFInfo
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- CN112031807A CN112031807A CN202010718762.0A CN202010718762A CN112031807A CN 112031807 A CN112031807 A CN 112031807A CN 202010718762 A CN202010718762 A CN 202010718762A CN 112031807 A CN112031807 A CN 112031807A
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- 238000010276 construction Methods 0.000 title claims abstract description 122
- 238000000034 method Methods 0.000 claims abstract description 17
- 230000005641 tunneling Effects 0.000 claims abstract description 10
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000002787 reinforcement Effects 0.000 abstract description 6
- 238000009412 basement excavation Methods 0.000 description 19
- 239000004567 concrete Substances 0.000 description 12
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 239000011435 rock Substances 0.000 description 6
- 238000007569 slipcasting Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000002708 enhancing effect Effects 0.000 description 3
- 239000011229 interlayer Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009933 burial Methods 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
- 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
- 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
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
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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
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
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Abstract
The invention discloses a variable-section supporting structure of a station tunnel and a construction method of the station tunnel, wherein the supporting structure comprises a construction channel and the station tunnel, the station tunnel is vertical and communicated with the end part of the construction channel, primary supports and secondary linings are arranged in the construction channel and the station tunnel, a plurality of transverse supports and vertical supports are arranged in the station tunnel, and the transverse supports and the vertical supports divide the station tunnel into a plurality of pilot tunnels; according to the method, certain reinforcement measures are taken at the primary combination position of the construction tunnel and the station tunnel, the construction tunnel directly expands and excavates the station tunnel to the section form after entering the station tunnel, then transversely excavates the station tunnel to the other end, and then excavates the station tunnel in sequence, so that the construction period is short, the construction efficiency is high, and the risk is low; in addition, the plurality of small pilot tunnels are arranged in the station tunnel, and each small pilot tunnel is independently constructed in the axial direction of the station tunnel to complete the tunneling of the station tunnel, so that the construction period is shortened, and the construction efficiency is improved.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a variable section supporting structure of a station tunnel and a construction method of the station tunnel.
Background
With the acceleration of the urbanization process in China, the utilization of underground space resources becomes one of the most important means for solving the problems of traffic congestion and land resource shortage. For subway stations, because the stations are deep in buried depth and large in size, underground excavation methods are mainly adopted for construction at present. The method specifically comprises the following steps: firstly, digging a construction channel, then digging a station tunnel from the construction channel, and finally tunneling the station tunnel along the axial direction of the station tunnel; when the construction channel is excavated, the construction channel firstly reaches the excavation end along the advancing direction of the construction channel, then the construction channel section is reversely excavated and expanded, and the length range of the channel is completely expanded and excavated in place according to the construction channel section. The disadvantages of the excavation mode are as follows: firstly, when the reverse expanding excavation is carried out, the method belongs to the excavation of 'immortal soil', the safety risk is high, the top stones of the heads of workers are easy to fall off to hurt people, and meanwhile, the collapse risk also exists; firstly, excavating once according to the section of the construction channel, and then reversely expanding and excavating once, wherein the two-time excavation period is long, and the progress of the construction period is influenced; and thirdly, the station tunnel is large in size and deep in burial depth, so that primary supporting and secondary lining of the station tunnel are difficult, excavation is difficult, the risk of excavation is large, and the efficiency is low.
Disclosure of Invention
The invention provides a variable-section supporting structure of a station tunnel and a construction method of the station tunnel, which aim to solve the technical problems of low efficiency and large risk of variable-section excavation when the station tunnel and an underground construction channel enter the station tunnel.
The technical scheme adopted by the invention is as follows: the variable-section supporting structure of the station tunnel comprises a construction channel and the station tunnel, wherein the station tunnel is vertical and is communicated with the end part of the construction channel, an initial support and a secondary lining are arranged in the construction channel and the station tunnel, a plurality of transverse supports and vertical supports are arranged in the station tunnel, and the station tunnel is separated into a plurality of guide holes by the transverse supports and the vertical supports. Because the station tunnel is deep in buried depth and large in size, a plurality of small pilot tunnels are arranged in the station tunnel, and each small pilot tunnel is independently constructed in the axial direction of the station tunnel to complete the tunneling of the station tunnel; and meanwhile, the risk of station tunnel collapse is also reduced.
Further, the number of the transverse supports is six, the number of the vertical supports is two, and the transverse supports and the vertical supports divide the station tunnel into nine pilot tunnels; the transverse supports are respectively arranged at the middle upper part and the middle lower part of the station tunnel, and the vertical supports are symmetrically arranged relative to the central line of the station tunnel. Too many pilot tunnels are arranged, so that the construction cost of primary support and secondary lining is increased, and the construction efficiency is reduced; the pilot tunnel is arranged too few, the stability of surrounding rocks of the station tunnel is poor, and the risk of construction collapse is also improved; therefore, the invention preferably selects nine pilot tunnels in a plurality of modes, thereby not only ensuring the construction efficiency and the construction cost, but also reducing the construction risk to the minimum; and the transverse supports are arranged at the middle upper part and the middle lower part of the station tunnel, so that the area difference of each pilot tunnel is small, and the stability of the pilot tunnel is further ensured.
Further, the vertical supports are arc-shaped, and the vertical supports are bent towards the center of the tunnel. Because the vault and the arch bottom in tunnel are the arc, if set up vertical braces for the structure of the direction on perpendicular to ground, can make the country rock side atress of tunnel inner wall, cause the tunnel atress inhomogeneous, vertical braces can't be with the perpendicular atress of tunnel inner wall, vertical braces's support poor stability. Therefore, the vertical supports are arranged in the arc shape, the arc-shaped vertical supports are stressed perpendicularly to the inner wall of the tunnel, stress is more uniform, and stability is higher.
Furthermore, one end of the construction tunnel, which is close to the station tunnel, is provided with a door frame extending into the station tunnel. The invention adopts certain reinforcement measures at the primary combination position of the construction tunnel and the station tunnel, directly expands and excavates the construction tunnel and the station tunnel to the section form of the station tunnel after entering the station tunnel, then transversely excavates the construction tunnel to the other end in the station tunnel, and excavates the station tunnel in sequence.
Further, an arc-shaped arch center is arranged below the door frame. Further improve the stability of construction tunnel and the first combination department of station tunnel.
Further, a first grouting anchor rod penetrating into the primary support and the secondary lining is arranged on the inner wall of the station tunnel; the first grouting anchor rod is of a hollow structure. The first grouting anchor rod plays a role in supporting and reinforcing the surrounding rock of the tunnel, and the interlayer friction resistance is improved. In addition, mortar can be injected into the concrete in the primary support and the secondary lining through the grouting anchor rod to fill the concrete gap, so that the effects of reinforcing the concrete and preventing water seepage are achieved.
Further, two opposite sides of the vertical supports are provided with second grouting anchor rods; the second slip casting stock is hollow structure. All there is the concrete layer on vertical braces and the horizontal support, can pour into the mortar into to the concrete on the vertical braces through the slip casting stock, play the effect of reinforced concrete and prevention of seepage water.
The construction method of the station tunnel comprises the following steps:
s1, firstly digging a construction channel, and carrying out primary support and secondary lining in the construction channel;
s2, arranging a door frame at one end of the construction channel connected with the station tunnel, and arranging an arch frame below the door frame;
s3, according to the trend of the construction channel, excavating a station tunnel in the direction perpendicular to the construction channel at the end part of the construction channel; the method specifically comprises the following steps: excavating from one end of the station tunnel to the other end of the station tunnel in the transverse direction of the station tunnel; firstly digging the upper half part of the station tunnel along a base line in the station tunnel, performing primary support, secondary lining and a first grouting anchor rod, then digging the lower half part of the station tunnel, and performing primary support and secondary lining;
s4, erecting a vertical support and a transverse support in the station tunnel, and erecting a second grouting anchor rod; the station tunnel is divided into nine pilot tunnels by the transverse supports and the vertical supports, primary support and secondary lining are carried out on each pilot tunnel, and each pilot tunnel is independently constructed in the axial direction of the station tunnel to carry out tunneling of the station tunnel; and after the construction of the station tunnel is finished, the transverse support and the vertical support are removed.
According to the method, certain reinforcement measures are taken at the primary combination position of the construction tunnel and the station tunnel, the construction tunnel directly expands and excavates the station tunnel to the section of the station tunnel after entering the station tunnel, then the construction tunnel transversely excavates the station tunnel to the other end, and then each pilot tunnel of the station tunnel is excavated separately in sequence. Compared with the traditional one-time tunneling mode of the station tunnel, the method can more conveniently carry out primary support and secondary lining on the station tunnel, reduce the construction period and improve the construction efficiency; and meanwhile, the risk of station tunnel collapse is also reduced. The method is safe, reliable, economical and feasible, and short in construction period.
Further, in step S3, the base line is inclined toward the top of the tunnel, and the included angle between the base line and the horizontal direction is 5 ° to 10 °. In the process of tunnel excavation, a scaffold is required to be erected in a tunnel, and the tunnel is excavated transversely in an inclined mode, so that the working height during station excavation can be reduced, the erecting height of the scaffold can be reduced, the labor intensity of workers can be reduced, and the erecting efficiency can be improved; on the other hand is convenient for collect and carry the dregs in the tunnel work progress, and the operation of the base line of slope on being convenient for the dregs roll off and haulage vehicle on the benchmark line, labour saving and time saving improves the efficiency of construction.
Further, in step S4, the construction sequence of the nine pilot holes sequentially includes: and constructing an upper right pilot tunnel, an upper left pilot tunnel, a middle right pilot tunnel, a middle left pilot tunnel, a lower right pilot tunnel, a lower left pilot tunnel, an upper core pilot tunnel, a middle core pilot tunnel and a lower core pilot tunnel. From the construction sequence, the pilot tunnel is constructed from top to bottom, and the lower part of the pilot tunnel which is not constructed plays a role in supporting the pilot tunnel in the upper part construction, so that the stability of the constructed pilot tunnel is improved, the collapse risk is reduced, and the safety of constructors is ensured; meanwhile, the dregs in the upper guide tunnel can naturally fall to the lower guide tunnel, so that the collection and transportation of the dregs are facilitated. In terms of construction sequence, the invention firstly constructs the pilot tunnels at two sides, then constructs the core pilot tunnel in the middle, and the un-constructed core pilot tunnel is connected between the arch crown and the arch bottom, thereby supporting the whole tunnel, enhancing the stability of the whole tunnel, ensuring the effective and stable construction of the rest pilot tunnels, and reducing the risk to the minimum.
The invention has the beneficial effects that:
1. according to the method, certain reinforcement measures are taken at the primary combination position of the construction tunnel and the station tunnel, the construction tunnel directly expands and excavates the cross section of the station tunnel after entering the station tunnel, then the station tunnel is transversely excavated to the other end in the station tunnel, and then the station tunnel is excavated in sequence, so that the construction period is short, the construction efficiency is high, and the risk is low.
2. According to the invention, the plurality of small pilot tunnels are arranged in the station tunnel, and each small pilot tunnel is independently constructed in the axial direction of the station tunnel to complete the tunneling of the station tunnel; and meanwhile, the risk of station tunnel collapse is also reduced.
3. According to the tunnel vertical support, the vertical supports are arranged to be arc-shaped, the arc-shaped vertical supports are stressed perpendicularly to the inner wall of the tunnel, stress is more uniform, and stability is higher.
4. The invention excavates transversely on the tunnel in an inclined mode, so that the working height during station excavation can be reduced, the building height of a scaffold can be reduced, the labor intensity of workers can be reduced, and the building efficiency can be improved; on the other hand is convenient for collect and carry the dregs in the tunnel work progress, and the operation of the base line of slope on being convenient for the dregs roll off and haulage vehicle on the benchmark line, labour saving and time saving improves the efficiency of construction.
5. The pilot tunnel construction sequence of the invention is from top to bottom construction, the lower part of the non-constructed pilot tunnel supports the upper part of the pilot tunnel, thus improving the stability of the constructed pilot tunnel, reducing the collapse risk and ensuring the safety of constructors; meanwhile, the dregs in the upper guide tunnel can naturally fall to the lower guide tunnel, so that the collection and transportation of the dregs are facilitated.
6. The pilot tunnel construction sequence of the invention is that pilot tunnels on two sides are constructed firstly, then a core pilot tunnel in the middle is constructed, and the un-constructed core pilot tunnel is connected between the arch crown and the arch crown, thereby supporting the whole tunnel, enhancing the stability of the whole tunnel, ensuring the effective and stable construction of the rest pilot tunnels and reducing the risk to the minimum.
Drawings
Fig. 1 is a diagram of a pilot tunnel layout of the present invention.
Fig. 2 is a plan view of a construction tunnel and a station tunnel.
Fig. 3 is a schematic view of a construction tunnel entering a station tunnel.
Fig. 4 is a top view of fig. 3.
FIG. 5 is a schematic diagram of a station tunnel lateral expanding excavation
Fig. 6 is a top view of fig. 5.
Fig. 7 is a schematic diagram of excavation of an upper right pilot tunnel in a station tunnel.
Fig. 8 is a top view of fig. 7.
Fig. 9 is a schematic structural view of the door frame.
Labeled as:
1. constructing a tunnel; 2. a station tunnel; 3. transversely supporting; 4. vertical support; 5. the central line of the station tunnel; 6. a door frame; 7. an arch frame; 8. a first slip casting anchor rod; 9. a second slip casting anchor rod; 10. a ground locking anchor rod; 11. a baseline; i, guiding a hole at the upper right; II, guiding holes at the upper left; III, guiding a hole in the right middle; IV, guiding holes in the left middle; v, guiding holes at the right lower part; VI, guiding the hole at the left lower part; VII, a guide hole is formed in the core; VIII, guiding a hole in the core; IX, a core lower pilot tunnel.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Example one
Referring to fig. 1 to 9, the variable cross-section supporting structure of the station tunnel comprises a construction channel 1 and the station tunnel 2, wherein the station tunnel 2 is perpendicular to and communicated with the end of the construction channel 1, primary supports (not shown in the figure) and secondary linings (not shown in the figure) are arranged in the construction channel 1 and the station tunnel 2, a plurality of transverse supports 3 and vertical supports 4 are arranged in the station tunnel 2, and the transverse supports 3 and the vertical supports 4 divide the station tunnel 2 into a plurality of guide holes. Because the station tunnel is deep in buried depth and large in size, a plurality of small pilot tunnels are arranged in the station tunnel, and each small pilot tunnel is independently constructed in the axial direction of the station tunnel to complete the tunneling of the station tunnel; and meanwhile, the risk of station tunnel collapse is also reduced.
Referring to fig. 1, the number of the transverse supports 3 is six, the number of the vertical supports 4 is two, and the transverse supports 3 and the vertical supports 4 divide the station tunnel 2 into nine pilot tunnels; the transverse supports 3 are respectively arranged at the middle upper part and the middle lower part of the station tunnel 2, and the vertical supports 4 are symmetrically arranged about the central line 5 of the station tunnel. Too many pilot tunnels are arranged, so that the construction cost of primary support and secondary lining is increased, and the construction efficiency is reduced; the pilot tunnel is arranged too few, the stability of surrounding rocks of the station tunnel is poor, and the risk of construction collapse is also improved; therefore, the invention preferably selects nine pilot tunnels in a plurality of modes, thereby not only ensuring the construction efficiency and the construction cost, but also reducing the construction risk to the minimum; and the transverse supports are arranged at the middle upper part and the middle lower part of the station tunnel, so that the area difference of each pilot tunnel is small, and the stability of the pilot tunnel is further ensured.
Referring to fig. 1, the vertical supports 4 of the present embodiment are arc-shaped, and the vertical supports 4 are bent in the direction of the center of the tunnel. Because the vault and the arch bottom in tunnel are the arc, if set up vertical braces for the structure of the direction on perpendicular to ground, can make the country rock side atress of tunnel inner wall, cause the tunnel atress inhomogeneous, vertical braces can't be with the perpendicular atress of tunnel inner wall, vertical braces's support poor stability. Therefore, the vertical supports are arranged in the arc shape, the arc-shaped vertical supports are stressed perpendicularly to the inner wall of the tunnel, stress is more uniform, and stability is higher.
Referring to fig. 1, one end of the construction tunnel 1 of the present embodiment, which is close to the station tunnel 2, is provided with a door frame 6 extending into the station tunnel 2. The invention adopts certain reinforcement measures at the primary combination position of the construction tunnel and the station tunnel, directly expands and excavates the construction tunnel and the station tunnel to the section form of the station tunnel after entering the station tunnel, then transversely excavates the construction tunnel to the other end in the station tunnel, and excavates the station tunnel in sequence.
Referring to fig. 1, the present embodiment is provided with an arc-shaped arch 7 below a door frame 6. Further improve the stability of construction tunnel and the first combination department of station tunnel.
Referring to fig. 1, in the present embodiment, a first grouting anchor rod 8 is provided on the inner wall of a station tunnel 2 to penetrate into a primary support and a secondary lining; the first grouting anchor rod 8 is of a hollow structure. The first grouting anchor rod plays a role in supporting and reinforcing the surrounding rock of the tunnel, and the interlayer friction resistance is improved. In addition, mortar can be injected into the concrete in the primary support and the secondary lining through the grouting anchor rod to fill the concrete gap, so that the effects of reinforcing the concrete and preventing water seepage are achieved.
Referring to fig. 1, the present embodiment is provided with second grouting bolts 9 at opposite sides of the vertical supports 4; the second grouting anchor rod 9 is of a hollow structure. All there is the concrete layer on vertical braces and the horizontal support, can pour into the mortar into to the concrete on the vertical braces through the slip casting stock, play the effect of reinforced concrete and prevention of seepage water.
Referring to fig. 7, this embodiment is provided with ground locking anchors in connection with the tunnel on the lateral supports. The stability of the lateral support is enhanced.
Example two
The construction method of the station tunnel comprises the variable cross-section supporting structure of the station tunnel in the first embodiment, and comprises the following steps:
s1, firstly digging a construction channel 1, and carrying out primary support and secondary lining in the construction channel;
s2, arranging a door frame 6 at one end of the construction channel connected with the station tunnel, and arranging an arch center 7 below the door frame 6; the door frame is a steel door frame, the steel door frame is formed by welding three densely-arranged I22 b-shaped steels, the door frame is longitudinally welded and connected into a whole by adopting phi 22 steel bars at an annular interval of 1m, and the sprayed concrete is tight.
S3, according to the trend of the construction channel 1, excavating a station tunnel 2 in the direction that the end part of the construction channel 1 is vertical to the construction channel; the method specifically comprises the following steps: excavating from one end of the station tunnel to the other end of the station tunnel in the transverse direction of the station tunnel; firstly digging the upper half part of the station tunnel along a base line 11 in the station tunnel, carrying out primary support, secondary lining and a first grouting anchor rod 8, then digging the lower half part of the station tunnel, and carrying out primary support and secondary lining;
the excavation section of the station tunnel is 30cm larger than the outline range of the station tunnel, the excavation depth is 1m each time, first grouting anchor rods are arranged next to the excavation section, steel door frames are erected and sprayed with C25 early strength concrete with the thickness of 30cm for sealing, the distance between every two frames is 0.5m, the door frames are welded into a whole at the circumferential distance of 1m by phi 22 steel bars, the door frames are different in size and are gradually increased;
after a station tunnel is dug to the head transversely, installing arch frames on the lower parts of steel door frames, wherein the arch frames are arc-shaped, the distance between every two frames is 0.5m, each door-shaped frame is welded and connected into a whole by using phi 22 steel bars at the circumferential distance of 1m, and C25 early strength concrete with the thickness of 30cm is sprayed to seal the door-shaped frame;
s4, erecting a vertical support 3 and a transverse support 4 in the station tunnel 2; the station tunnel is divided into nine pilot tunnels by the transverse supports 3 and the vertical supports 4, a second grouting anchor rod 9 is erected, primary support and secondary lining are carried out on each pilot tunnel, and each pilot tunnel is independently constructed in the axial direction of the station tunnel to carry out tunneling of the station tunnel; and after the construction of the station tunnel is finished, the transverse support and the vertical support are removed.
According to the method, certain reinforcement measures are taken at the primary combination position of the construction tunnel and the station tunnel, the construction tunnel directly expands and excavates the station tunnel to the section of the station tunnel after entering the station tunnel, then the construction tunnel transversely excavates the station tunnel to the other end, and then each pilot tunnel of the station tunnel is excavated separately in sequence. Compared with the traditional one-time tunneling mode of the station tunnel, the method can more conveniently carry out primary support and secondary lining on the station tunnel, reduce the construction period and improve the construction efficiency; and meanwhile, the risk of station tunnel collapse is also reduced. The method is safe, reliable, economical and feasible, and short in construction period.
Referring to fig. 5, in step S3, the baseline 11 is inclined toward the top of the tunnel, and the angle between the baseline 11 and the horizontal direction is 8 °. In the process of tunnel excavation, a scaffold is required to be erected in a tunnel, and the tunnel is excavated transversely in an inclined mode, so that the working height during station excavation can be reduced, the erecting height of the scaffold can be reduced, the labor intensity of workers can be reduced, and the erecting efficiency can be improved; on the other hand is convenient for collect and carry the dregs in the tunnel work progress, and the operation of the base line of slope on being convenient for the dregs roll off and haulage vehicle on the benchmark line, labour saving and time saving improves the efficiency of construction.
Referring to fig. 1, in step S4, the construction sequence of nine pilot holes is as follows: and constructing an upper right pilot tunnel I, an upper left pilot tunnel II, a middle right pilot tunnel III, a middle left pilot tunnel IV, a lower right pilot tunnel V, a lower left pilot tunnel VI, an upper core pilot tunnel VII, a middle core pilot tunnel VIII and a lower core pilot tunnel IX. From the construction sequence, the pilot tunnel is constructed from top to bottom, and the lower part of the pilot tunnel which is not constructed plays a role in supporting the pilot tunnel in the upper part construction, so that the stability of the constructed pilot tunnel is improved, the collapse risk is reduced, and the safety of constructors is ensured; meanwhile, the dregs in the upper guide tunnel can naturally fall to the lower guide tunnel, so that the collection and transportation of the dregs are facilitated. In terms of construction sequence, the invention firstly constructs the pilot tunnels at two sides, then constructs the core pilot tunnel in the middle, and the un-constructed core pilot tunnel is connected between the arch crown and the arch bottom, thereby supporting the whole tunnel, enhancing the stability of the whole tunnel, ensuring the effective and stable construction of the rest pilot tunnels, and reducing the risk to the minimum.
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. Variable section supporting construction in station tunnel, including construction passageway (1) and station tunnel (2), its characterized in that, the tip of station tunnel (2) perpendicular and intercommunication construction passageway (1), all be provided with preliminary bracing and secondary lining in construction passageway (1) and station tunnel (2), arranged a plurality of horizontal support (3) and vertical braces (4) in station tunnel (2), horizontal support (3) and vertical braces (4) separate station tunnel (2) for a plurality of pilot tunnel.
2. A variable-section supporting structure of a station tunnel as claimed in claim 1, wherein the number of the lateral supports (3) is six, the number of the vertical supports (4) is two, and the lateral supports (3) and the vertical supports (4) divide the station tunnel (2) into nine pilot tunnels; the transverse supports (3) are respectively arranged at the middle upper part and the middle lower part of the station tunnel (2), and the vertical supports (4) are symmetrically arranged relative to the central line (5) of the station tunnel.
3. A support structure for a varying section of a station tunnel according to claim 1, characterized in that said vertical supports (4) are arc-shaped, the vertical supports (4) being bent in the direction of the center of the tunnel.
4. A station tunnel variable-section supporting structure as claimed in claim 1, wherein one end of the construction tunnel (1) near the station tunnel (2) is provided with a door frame (6) extending into the station tunnel (2).
5. A supporting construction for a station tunnel in a varying section as claimed in claim 4, characterized in that an arc-shaped arch (7) is provided under said door frame (6).
6. A variable-section supporting structure of a station tunnel as claimed in claim 1, wherein the inner wall of the station tunnel (2) is provided with a first grouting bolt (8) penetrating into the primary support and the secondary lining; the first grouting anchor rod (8) is of a hollow structure.
7. A variable-section supporting structure of a station tunnel as claimed in any one of claims 1 to 6, wherein second grouting anchor rods (9) are arranged on two opposite sides of the vertical supports (4); the second grouting anchor rod (9) is of a hollow structure.
8. A construction method of a station tunnel, including the variable-section supporting structure of a station tunnel as claimed in claim 7, characterized by comprising the steps of:
s1, digging a construction channel (1) first, and performing primary support and secondary lining in the construction channel;
s2, arranging a door frame (6) at one end of the construction channel connected with the station tunnel, and arranging an arch center (7) below the door frame (6);
s3, according to the trend of the construction channel (1), excavating a station tunnel (2) on the end part of the construction channel (1) in the direction vertical to the construction channel; the method specifically comprises the following steps: excavating from one end of the station tunnel to the other end of the station tunnel in the transverse direction of the station tunnel; firstly digging the upper half part of the station tunnel along a base line (11) in the station tunnel, performing primary support, secondary lining and a first grouting anchor rod (8), then digging the lower half part of the station tunnel, and performing primary support and secondary lining;
s4, erecting a vertical support (3) and a transverse support (4) in the station tunnel (2); the station tunnel is divided into nine pilot tunnels by the transverse supports (3) and the vertical supports (4), second grouting anchor rods (9) are erected, primary support and secondary lining are carried out on each pilot tunnel, and each pilot tunnel is independently constructed in the axial direction of the station tunnel to carry out tunneling of the station tunnel; and after the construction of the station tunnel is finished, the transverse support and the vertical support are removed.
9. A construction method of a station tunnel according to claim 8, characterized in that in the step S3, the base line (11) is inclined toward the top of the tunnel, and an angle between the base line (11) and the horizontal direction is 5 ° to 10 °.
10. A construction method of a station tunnel as claimed in claim 8, wherein in the step S4, the construction sequence of the nine pilot tunnels is as follows: constructing an upper right pilot tunnel (I), an upper left pilot tunnel (II), a middle right pilot tunnel (III), a middle left pilot tunnel (IV), a lower right pilot tunnel (V), a lower left pilot tunnel (VI), an upper core pilot tunnel (VII), a middle core pilot tunnel (VIII) and a lower core pilot tunnel (IX).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010718762.0A CN112031807A (en) | 2020-07-23 | 2020-07-23 | Variable-section supporting structure of station tunnel and construction method of station tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010718762.0A CN112031807A (en) | 2020-07-23 | 2020-07-23 | Variable-section supporting structure of station tunnel and construction method of station tunnel |
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| CN110905524A (en) * | 2019-11-08 | 2020-03-24 | 中建隧道建设有限公司 | Method for excavating and supporting subway station tunnel by adopting underground excavation construction channel |
| CN111271093A (en) * | 2020-03-24 | 2020-06-12 | 中铁二院昆明勘察设计研究院有限责任公司 | Underground excavation subway station auxiliary cross passage interface primary support system and construction method |
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| CN105822310A (en) * | 2016-05-23 | 2016-08-03 | 重庆大学 | Rapid low-risk station tunnel digging method |
| CN207453979U (en) * | 2017-09-26 | 2018-06-05 | 中铁隧道集团二处有限公司 | A kind of extra-large cross-section subway station combed construction passage |
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