CN113062750A - Construction method of tunnel structure with underground structure uplift pile penetrating downwards - Google Patents
Construction method of tunnel structure with underground structure uplift pile penetrating downwards Download PDFInfo
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- CN113062750A CN113062750A CN202110474795.XA CN202110474795A CN113062750A CN 113062750 A CN113062750 A CN 113062750A CN 202110474795 A CN202110474795 A CN 202110474795A CN 113062750 A CN113062750 A CN 113062750A
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- uplift pile
- tunnel
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- pile
- steel
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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
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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
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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
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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
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
Abstract
The invention discloses a construction method of a tunnel structure for a pull-out resistant pile of an underground structure. It comprises the following steps: the method comprises the following steps: excavating a standard section tunnel; step two: excavating tunnels of sections near the uplift piles; chiseling out the main reinforcement of the uplift pile; erecting profile steel arch frames on the left side and the right side of a pile body of the uplift pile; statically breaking the uplift pile concrete, densely distributing the steel arch frames in the range of the pile body of the uplift pile and welding the steel arch frames with the main reinforcement of the uplift pile; spraying concrete and sealing the primary support; step three: and after the primary support reaches the design strength and is deformed stably, pouring a secondary lining to complete the construction of the tunnel structure of the uplift pile of the underground structure. The invention has the advantages of smoothly passing through the existing subway station and ensuring that the floating resistance of the existing subway station is not influenced.
Description
Technical Field
The invention relates to the field of tunnel engineering, in particular to a construction method of a tunnel structure with an underground structure uplift pile.
Background
With the rapid development of the construction of rail transit projects of various cities, the wire mesh planning is continuously updated, so that the project construction conditions of later-stage lines are not reserved in the early-stage construction process of part of stations, and the construction scheme of a newly-built project is directly restricted.
For solving the vertical anti problem of floating of station, the station adopts the pile foundation as structural measure more, when the stress condition of pile foundation changes, probably influences the anti floating of station.
The line construction control factors of the rail transit are influenced by the surrounding environment, and the selectable line schemes are few, so that when a newly-built tunnel project is selected, the conditions of fender piles and uplift piles can be met in the tunnel construction range, and therefore the tunnel construction scheme needs to be mainly considered on the premise of ensuring the structural safety of an existing station, and how to safely construct the tunnel.
In order to break fender piles and uplift piles in the tunnel construction range, newly-built tunnels are usually excavated by a mine method, reinforcement is needed to be carried out in due time according to the stratum condition before excavation, and when the stratum condition is better, excavation can be directly carried out.
The uplift pile of the existing station has a structure stress system which is greatly changed due to the construction of a newly-built tunnel project, so that the anti-floating of the existing station is directly influenced.
In order to solve the problem of structural anti-floating of the existing station, measures such as adding anti-pulling piles, anti-pulling anchor rods and ballast weights on the ground can be adopted, but the measures have great influence on the existing station, the ground construction can cause adverse effects on traffic fluffing, pipeline operation and the like around the existing station, and the construction difficulty is great.
Therefore, it is necessary to develop a construction method of a tunnel structure that solves the anti-floating problem of the existing station structure and does not affect the existing station traffic and pipeline operation.
Disclosure of Invention
The invention aims to provide a construction method of a tunnel structure for underpassing an underground structure uplift pile, which can smoothly underpassing an existing subway station, ensure that the floating resistance of the existing subway station is not influenced, and the traffic and pipeline operation of the existing station are not influenced.
In order to achieve the purpose, the technical scheme of the invention is as follows: a construction method of a tunnel structure for underpassing an underground structure uplift pile is characterized in that: the method comprises the following steps:
the method comprises the following steps: excavating a standard section tunnel;
the standard section tunnel excavation specifically comprises the following steps,
s11: constructing an advance support;
s12: excavating an upper half section;
s13: spraying concrete for the first time;
s14: constructing a profile steel arch center with an upper half section;
s15: excavating a lower half section;
s16: constructing a profile steel arch center with a lower half section;
s17: the steel arch of the upper half section and the steel arch of the lower half section are closed to form a ring to form a primary support;
s18: grouting behind the primary support;
step two: excavating tunnels of sections near the uplift piles;
the excavation of the tunnel of the section near the uplift pile specifically comprises the following steps,
s21: chiseling out the main reinforcement of the uplift pile;
s22: according to the actual position of a pile body of the field uplift pile, sequentially excavating an upper half section and a lower half section, and arranging primary-support section steel arch frames close to two sides of the uplift pile;
s23: the pile body concrete of the uplift pile is broken through statically, and the steel arch frames are densely distributed in the pile body range of the uplift pile and are welded with main reinforcements of the uplift pile;
s24: spraying concrete and sealing the primary support;
step three: and after the primary support reaches the design strength and is deformed stably, pouring a secondary lining to complete the construction of the tunnel structure of the uplift pile of the underground structure.
In the technical scheme, the tunnel structure which penetrates through the underground structure uplift pile penetrates through the existing subway station and penetrates through the uplift pile; the uplift pile is separated and cut off through a tunnel structure which penetrates through the uplift pile of the underground structure;
the fender post is arranged on the periphery of the existing subway station; the uplift pile is arranged in the existing subway station;
the tunnel structure of the uplift pile with the underground structure comprises a primary support, a secondary lining and a steel bar lap joint structure;
the steel bar lapping structure is arranged at the joint of the cut uplift pile and the primary support;
the concrete structure is arranged at the position of the steel bar lap joint structure;
the secondary lining is arranged on the inner wall of the primary support.
In the technical scheme, the uplift pile main reinforcement is arranged in the uplift pile;
the primary support is provided with a steel arch frame;
the cut main reinforcement of the uplift pile is welded with the steel arch frame;
the concrete structure is arranged at the joint of the uplift pile and the primary support.
In the technical scheme, early strength shotcrete is adopted for primary support, the thickness is 300mm, the strength of the concrete is C35, and the impermeability grade is P10.
In the technical scheme, the secondary lining is made of molded reinforced concrete, the thickness of the secondary lining is 350mm, the strength of the concrete is C35, and the impermeability grade is P12.
In the technical scheme, the structural steel arch center adopts I-steel I22 b; the steel arch frames are connected by angle steel and steel plates, and the steel types are Q235b grade steel.
In the technical scheme, after the uplift pile is excavated and a complete structure is exposed, chiseling concrete of the uplift pile by using a small machine, reserving main ribs of the uplift pile for connection at the upper end and the lower end of the uplift pile respectively, and cutting the main ribs of the other uplift pile;
after the uplift pile is broken, 3-5 trusses of the profile steel arch are densely distributed near the uplift pile.
In the technical scheme, the steel bars at the welding position of the profile steel arch frame and the main steel bars of the uplift pile are welded by arc welding.
In the technical scheme, the main ribs of the secondary lining are mechanically connected, and the joint positions of the main ribs of the secondary lining are staggered;
the joint of the secondarily lined longitudinal tension reinforcing bars is less than or equal to 50% of the number of reinforcing bars within a range of 35d and greater than or equal to 500 mm.
The invention has the following advantages:
(1) the method is suitable for the uplift pile of the mine-method tunnel which passes through the existing subway station, and the primary support of the mine-method tunnel is connected with the uplift pile after being cut off, so that the tunnel smoothly passes through the existing subway station, and the anti-floating of the existing subway station is not influenced; the method can be suitable for the tunnel to pass through other underground structure uplift piles or temporary upright piles.
(2) The tunnel excavation in the invention adopts a mining method and timely erects a primary support, and the secondary lining can adopt cast-in-place concrete or segments which are assembled into a ring after the shield is air-pushed, thereby ensuring the stability of the structure.
The method is suitable for the uplift pile of the mine-method tunnel which passes through the existing subway station, and connects the primary support of the mine-method tunnel with the uplift pile after being cut, so that the tunnel smoothly passes through the existing subway station, and the anti-floating of the existing subway station is not influenced.
Drawings
Fig. 1 is a plan view of a newly built tunnel passing through an existing station.
Fig. 2 is a sectional view taken along line a-a of fig. 1.
Fig. 3 is a sectional view taken along line B-B of fig. 1.
Fig. 4 is a cross-sectional view taken along line C-C of fig. 1.
Fig. 5 is a sectional view of a newly-built tunnel underpass uplift pile in the invention.
Fig. 6 is a sectional view of the connection between the newly built tunnel and the uplift pile according to the present invention.
Fig. 7 is a side view of fig. 6.
In the figure, 1-an existing subway station, 2-fender piles, 3-uplift piles, 4-a tunnel structure of an uplift pile with an underground structure, 4-1 primary support, 4-2 secondary lining, 5-a steel-reinforced arch frame, 6-main reinforcements of the uplift pile and 7-a steel bar lapping structure are adopted.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are not intended to limit the present invention, but are merely exemplary. While the advantages of the invention will be clear and readily understood by the description.
The invention is suitable for the newly built tunnel to pass through the existing subway station; when the uplift pile is encountered in the tunnel construction range, the uplift pile is excavated by adopting a mining method, the uplift pile is broken, a primary support section steel arch frame of the tunnel adopting the mining method is welded with a main rib of the broken uplift pile, and after concrete is sprayed, the uplift pile and the primary support form a complete stress system, after the tunnel is subjected to secondary lining and the underground structure uplift pile is penetrated, the existing subway station can be smoothly penetrated, and the anti-floating of the existing subway station is ensured not to be influenced.
With reference to the accompanying drawings: a construction method of a tunnel structure for underpenetrating an uplift pile of an underground structure comprises the following steps:
the method comprises the following steps: excavating a standard section tunnel;
the standard section tunnel excavation specifically comprises the following steps,
s11: constructing an advance support;
s12: excavating an upper half section;
s13: spraying concrete for the first time;
s14: constructing a profile steel arch frame 5 with an upper half section;
s15: excavating a lower half section;
s16: constructing a profile steel arch frame 5 with a lower half section;
s17: the steel arch 5 with the closed upper half section and the steel arch 5 with the closed lower half section form a ring to form a primary support 4-1;
s18: grouting the back of the primary support 4-1 to reinforce the soil body outside the primary support 4-1;
step two: excavating tunnels of sections near the uplift piles;
the excavation of the tunnel of the section near the uplift pile specifically comprises the following steps,
s21: chiseling out the main uplift pile reinforcement 6 of the uplift pile 3;
s22: according to the actual position of a pile body of the field uplift pile, sequentially excavating an upper half section and a lower half section, and arranging profile steel arch frames 5 of primary supports 4-1 on two sides of the adjacent uplift pile;
s23: the concrete of the pile body of the uplift pile 3 is broken through statically, the section steel arch frame 5 is densely distributed in the range of the pile body of the uplift pile 3 and is welded with the main reinforcement 6 of the uplift pile 3;
s24: spraying concrete, and sealing the primary support 4-1;
step three: and after the primary support 4-1 reaches the design strength and deforms stably, pouring a secondary lining 4-2 to complete the construction of the tunnel structure of the uplift pile with the underground structure.
Further, a tunnel structure which penetrates through the underground structure uplift pile penetrates through the existing subway station 1 and penetrates through the uplift pile 3; the uplift pile 3 is separated and cut off through a tunnel structure 4 (namely a newly-built tunnel) which penetrates through the uplift pile of the underground structure;
the fender post 2 is arranged on the periphery of the existing subway station 1; the uplift pile 3 is arranged in the existing subway station 1;
the tunnel structure 4 for the uplift pile of the underpass underground structure comprises a primary support 4-1, a secondary lining 4-2 and a steel bar lapping structure 7;
the steel bar lapping structure 7 is arranged at the joint of the cut uplift pile 3 and the primary support 4-1;
the concrete structure is arranged at the position of the steel bar lapping structure 7;
the secondary lining 4-2 is arranged on the inner wall of the primary support 4-1.
Further, a main uplift pile rib 6 is arranged in the uplift pile 3;
a profile steel arch frame 5 is arranged on the primary support 4-1;
the uplift pile main reinforcement 6 is welded with the profile steel arch frame 5;
the concrete structure is arranged at the joint of the uplift pile 3 and the primary support 4-1.
Further, the uplift pile main reinforcement 6 is separated and cut off through the tunnel structure 4 of the uplift pile of the underground structure;
the steel bar lapping structure 7 comprises a cut-off uplift pile main rib 6 and a section steel arch frame 5; the cut uplift pile main reinforcement 6 is welded with the profile steel arch frame 5;
the concrete structure is arranged at the joint of the cut uplift pile main reinforcement 6 and the section steel arch frame 5.
Further, early strength shotcrete is adopted for the primary support 4-1, the thickness is 300mm, the strength of the concrete is C35, and the impermeability grade is P10; the concrete sprayed in the steps S13, S24 and S25 is early strength concrete;
and constructing a small advanced guide pipe on the tunnel face in advance and grouting before tunnel excavation.
Further, the secondary lining 4-2 is made of molded reinforced concrete, the thickness of the secondary lining is 350mm, the strength of the concrete is C35, and the impermeability grade is P12.
Further, the section steel arch center 5 adopts I-shaped steel I22 b; the steel arch frames 5 are connected by adopting angle steel and steel plates, and the types of the steel are Q235b grade steel;
in order to improve the convenience of site construction, the steel arch frame 5 is formed by splicing in blocks, and the splicing mode adopts bolt connection.
Further, after the uplift pile 3 is excavated and a complete structure is exposed, concrete of the uplift pile 3 is chiseled by a small machine such as an air pick, connecting uplift pile main ribs 6 (the reserved length of the connecting uplift pile main rib 6 is greater than or equal to 37d and greater than or equal to 200mm, and d is the diameter of a steel bar) within a to-be-connected range are reserved at the upper end and the lower end of the uplift pile 3 respectively, and the rest of the uplift pile main ribs 6 are cut off;
after the uplift pile 3 is broken, 3-5 trusses of the section steel arch 5 are densely distributed near the uplift pile 3, and the specific number is determined according to the diameter size of the uplift pile.
Further, the steel bar welding at the welding position of the steel arch frame 5 and the main rib 6 of the uplift pile adopts arc welding, when the steel arch frame 5 and the main rib 6 of the uplift pile adopt A3 steel and Q235 steel bars, an E43 type welding rod is adopted, and when HPB400 steel bars are welded, an E50 welding rod is adopted; the chemical components and mechanical properties of the welding molten metal meet the requirements of relevant specifications, and the welding of the reinforcing steel bars must be carried out according to construction conditions before welding.
Furthermore, the main reinforcement of the secondary lining 4-2 is preferably mechanically connected, the joint positions of the main reinforcement of the secondary lining 4-2 are arranged at the positions with smaller stress, and the joint positions are staggered with each other;
the joint number of the longitudinal tension reinforcing steel bars of the secondary lining 4-2 is less than or equal to 50% of the number of the reinforcing steel bars within the range of 35d and greater than or equal to 500mm, and the joint area of the longitudinal compression reinforcing steel bars can be unlimited.
The excavation and the pouring of the secondary lining of the standard section of the tunnel are both in the prior art.
In order to more clearly illustrate the advantages of the construction method of the tunnel structure of the underpass underground structure uplift pile compared with the prior art, the two technical schemes are compared by workers, and the comparison result is as follows:
as can be seen from the above table, compared with the prior art, the construction method of the tunnel structure of the underpass underground structure uplift pile ensures that the anti-floating of the existing subway station is not influenced, the tunnel can smoothly underpass the existing subway station, and the construction difficulty is small.
Other parts not described belong to the prior art.
Claims (9)
1. A construction method of a tunnel structure for underpassing an underground structure uplift pile is characterized in that: the method comprises the following steps:
the method comprises the following steps: excavating a standard section tunnel;
the standard section tunnel excavation specifically comprises the following steps,
s11: constructing an advance support;
s12: excavating an upper half section;
s13: spraying concrete for the first time;
s14: constructing a profile steel arch frame (5) with an upper half section;
s15: excavating a lower half section;
s16: constructing a profile steel arch frame (5) with a lower half section;
s17: the steel section arch (5) with the closed upper half section and the steel section arch (5) with the closed lower half section form a ring to form a primary support (4-1);
s18: grouting the back of the primary support (4-1);
step two: excavating tunnels of sections near the uplift piles;
the excavation of the tunnel of the section near the uplift pile specifically comprises the following steps,
s21: chiseling out the main reinforcement (6) of the uplift pile (3);
s22: according to the actual position of a pile body of the field uplift pile, sequentially excavating an upper half section and a lower half section, and arranging profile steel arch frames (5) of primary supports (4-1) at two sides close to the uplift pile;
s23: pile body concrete of the uplift pile (3) is broken through static force, and a section steel arch frame (5) is densely distributed in the pile body range of the uplift pile (3) and is welded with an uplift pile main rib (6) of the uplift pile (3);
s24: spraying concrete and sealing the primary support (4-1);
step three: and after the primary support (4-1) achieves the design strength and is stable in deformation, pouring a secondary lining (4-2) to finish the construction of the tunnel structure (4) of the uplift pile with the underground structure.
2. The construction method of a tunnel structure of an underpass underground structure uplift pile according to claim 1, which is characterized in that: the tunnel structure (4) which is penetrated through the underground structure uplift pile penetrates through the existing subway station (1) and penetrates through the uplift pile (3); the uplift pile (3) is separated and cut off through a tunnel structure (4) which penetrates through the uplift pile of the underground structure;
the fender post (2) is arranged on the periphery of the existing subway station (1); the uplift pile (3) is arranged in the existing subway station (1);
the tunnel structure (4) for the uplift pile of the underpass underground structure comprises a primary support (4-1), a secondary lining (4-2) and a steel bar lap joint structure (7);
the steel bar lap joint structure (7) is arranged at the joint of the cut uplift pile (3) and the primary support (4-1);
the concrete structure is arranged at the position of the steel bar lapping structure (7);
the secondary lining (4-2) is arranged on the inner wall of the primary support (4-1).
3. The construction method of a tunnel structure of an underpass underground structure uplift pile according to claim 2, characterized in that: the uplift pile main reinforcement (6) is arranged in the uplift pile (3);
a profile steel arch frame (5) is arranged on the primary support (4-1);
the cut uplift pile main reinforcement (6) is welded with the profile steel arch frame (5);
the concrete structure is arranged at the joint of the uplift pile (3) and the primary support (4-1).
4. The construction method of a tunnel structure of an underpass underground structure uplift pile according to claim 3, wherein: the primary support (4-1) adopts early strength shotcrete, the thickness is 300mm, the concrete strength is C35, and the impermeability grade is P10.
5. The construction method of a tunnel structure of an underpass underground structure uplift pile according to claim 4, wherein: the secondary lining (4-2) is made of molded reinforced concrete, the thickness of the secondary lining is 350mm, the strength of the concrete is C35, and the impermeability grade is P12.
6. The construction method of a tunnel structure of an underpass underground structure uplift pile according to claim 5, wherein: the section steel arch center (5) adopts I-shaped steel I22 b; the steel section steel arch frames (5) are connected by adopting angle steel and steel plates, and the steel types are Q235b grade steel.
7. The construction method of a tunnel structure of an underpass underground structure uplift pile according to claim 6, wherein: after the uplift pile (3) is excavated and a complete structure is exposed, chiseling concrete of the uplift pile (3) by adopting a small machine, reserving main uplift pile ribs (6) for connection at the upper end and the lower end of the uplift pile (3), and cutting the other main uplift pile ribs (6);
after the uplift pile (3) is broken, 3-5 trusses of the section steel arch (5) are densely distributed near the uplift pile (3).
8. The construction method of a tunnel structure of an underpass underground structure uplift pile according to claim 7, wherein: and arc welding is adopted for welding the steel bars at the welding position of the section steel arch frame (5) and the uplift pile main rib (6).
9. The construction method of a tunnel structure of an underpass underground structure uplift pile according to claim 8, wherein: the main bars of the secondary lining (4-2) are mechanically connected, and the joint positions of the main bars of the secondary lining (4-2) are staggered;
the longitudinal tension reinforcing steel bar of the secondary lining (4-2) is jointed by less than or equal to 50% of the number of the reinforcing steel bar within a range of 35d and greater than or equal to 500 mm.
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| CN202110474795.XA CN113062750A (en) | 2021-04-29 | 2021-04-29 | Construction method of tunnel structure with underground structure uplift pile penetrating downwards |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113803073A (en) * | 2021-09-27 | 2021-12-17 | 长江勘测规划设计研究有限责任公司 | Construction method of tunnel structure for manually removing obstacles on water-rich sand layer |
| CN113803074A (en) * | 2021-09-27 | 2021-12-17 | 长江勘测规划设计研究有限责任公司 | Construction method of tunnel structure for artificial and mechanical combined obstacle removal of water-rich sand layer |
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2021
- 2021-04-29 CN CN202110474795.XA patent/CN113062750A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113803073A (en) * | 2021-09-27 | 2021-12-17 | 长江勘测规划设计研究有限责任公司 | Construction method of tunnel structure for manually removing obstacles on water-rich sand layer |
| CN113803074A (en) * | 2021-09-27 | 2021-12-17 | 长江勘测规划设计研究有限责任公司 | Construction method of tunnel structure for artificial and mechanical combined obstacle removal of water-rich sand layer |
| CN113803073B (en) * | 2021-09-27 | 2024-01-19 | 长江勘测规划设计研究有限责任公司 | Construction method of tunnel structure for manually clearing obstacle in water-rich sand layer |
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