CN106988758B - Construction method for crossing large-scale vertical karst cave group tunnel - Google Patents

Construction method for crossing large-scale vertical karst cave group tunnel Download PDF

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Publication number
CN106988758B
CN106988758B CN201710318576.6A CN201710318576A CN106988758B CN 106988758 B CN106988758 B CN 106988758B CN 201710318576 A CN201710318576 A CN 201710318576A CN 106988758 B CN106988758 B CN 106988758B
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China
Prior art keywords
karst cave
concrete
construction
tunnel
karst
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CN201710318576.6A
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CN106988758A (en
Inventor
杨炎川
陈金
张登林
吴秀雄
魏毅
宋佳
蒋志权
解振乙
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Fifth Engineering Co Ltd of China Railway No 5 Engineering Group Co Ltd
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Fifth Engineering Co Ltd of China Railway No 5 Engineering Group Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/14Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/10Lining 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
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D13/00Large underground chambers; Methods or apparatus for making them
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F16/00Drainage
    • E21F16/02Drainage of tunnels
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/20Hydro energy

Abstract

The invention discloses a construction method for crossing a large-scale vertical karst cave group tunnel, which adopts the technical measure that a water channel is reserved for backfill concrete for the large-scale vertical karst cave group, steel arch frames and pipe sheds are used for reinforcing and supporting karst cave sections, reinforced concrete beam plate structures are used for crossing the tunnel bottoms of the karst cave sections, the bearing capacity of a foundation is greatly improved, municipal corrugated pipes are pre-buried before backfill concrete for peripheral cracks of the vertical karst cave group and arch karst cave, and are led to the water channel, hidden danger of high-pressure karst water caused by long-time ponding is eliminated, and safety during construction and later operation is ensured. The method has the advantages of convenient construction, greatly shortened construction period, improved karst cave treatment filling effect, improved safety of subsequent construction, simple and convenient pouring materials and construction method without special requirements, and good use effect is achieved by on-site implementation.

Description

Construction method for crossing large-scale vertical karst cave group tunnel
Technical Field
The invention relates to a construction method for crossing a large vertical karst cave group tunnel, and belongs to the technical field of karst tunnels for large vertical karst cave group treatment.
Background
For tunnels passing through large vertical karst cave groups, karst cave with large scale and development depth of more than 30m is generally filled and constructed by adopting a roadbed mode. The karst cavity around the tunnel is backfilled by adopting conventional filling slag or M7.5 slurry rubble, the material consumption is huge and the karst cavity cannot be transported to a working surface, the mechanical consumption is large, the construction period cannot be predicted, the construction cost and the safety risk are extremely large, the construction period cannot be ensured, and the difficulty of field treatment is greatly increased.
Disclosure of Invention
The invention aims to solve the technical problems that: the utility model provides a be used for crossing large-scale vertical karst cave crowd tunnel construction method, in handling large-scale vertical karst cave crowd tunnel construction, adopt equipment such as small-size machinery, concrete delivery pump, just can handle the karst cave, overcome the manpower and materials consumption that prior art scheme exists and big, the processing process is long in time, the construction degree of difficulty is big, the high scheduling defect of construction risk improves karst tunnel construction work efficiency, reduce cost, reduction security risk.
The technical scheme adopted by the invention is as follows: a construction method for crossing a large-scale vertical karst cave group tunnel comprises the following specific implementation steps:
step one, removing dangerous rock falling rocks locally existing on the karst cave rock wall, and adopting sprayed C20 concrete for protection. The section of the vertical hole is enlarged and dug to serve as an operation channel, and the later stage is used as an inspection cavity.
And step two, adopting a treatment measure mainly based on backfilling for the large-scale vertical karst cave group, adopting C20 concrete pouring and backfilling for a platform above about 48m of the vertical karst cavity of the tunnel face, reserving a water passage, applying anchor rods to surrounding rock walls to embed rock bodies before concrete pouring, and increasing the integrity of backfilled concrete and the karst cave walls.
And thirdly, expanding and digging the karst cave face to a V-level surrounding rock support type section, and setting an I20a arch frame, shi Zuo pipe sheds and advanced small guide pipe grouting advanced support.
And fourthly, after the construction of the lower step excavation supporting construction is 25 meters, returning to excavate the karst cave section to the tunnel bottom to construct the reinforced concrete slab beam.
Fifthly, constructing an arch wall lining, backfilling the lining with C20 concrete within a range of 3m outside the contour line, blowing sand on the back and adding waste rubber tires as a buffer layer, and backfilling the lining to a height of 2m above the arch crown.
Preferably, the municipal corrugated pipes are pre-buried before backfilling concrete in the peripheral cracks of the vertical karst cave group and the arch karst cave, and are led to the water channel.
The invention adopts the technical measure of reserving a water passage for backfilling concrete, and the aim of quickly and safely treating karst tunnels is achieved by strengthening and supporting the karst cave section and adopting the reinforced concrete beam plate structure to span the bottom of the karst cave section.
The invention has the beneficial effects that: compared with the prior art, the invention has the following effects:
1) Only small-sized machinery, a concrete conveying pump and other equipment are needed, the karst cave can be treated, and the efficiency of the later tunnel construction is improved.
2) Compared with the conventional filling hole slag, the method has the advantages that the backfill concrete is adopted to reserve the water passage, the construction period is short, the materials are saved, the working efficiency is improved, and the foundation bearing capacity requirement can be met.
3) And the plate girder crossing structure is adopted, so that the safety of karst cave treatment is improved. The municipal corrugated pipe pre-buried in the peripheral fissures and the arch dissolution cavity is shot to the water passing channel, so that hidden danger of high-pressure karst water caused by long-time ponding is eliminated, and effective safety guarantee is obtained during construction and later put into operation.
4) The sand is blown to the back of the vault backfill concrete and the waste rubber tire is used as a buffer layer, so that the damage of karst cave roof falling rocks to a two-lining structure can be greatly reduced.
Drawings
FIG. 1 is a schematic view of karst cave backfill according to the present invention;
fig. 2 is a schematic view of the reinforced concrete slab beam structure of the present invention;
the marks in the figure are as follows: 1. the concrete for surface protection comprises 2 parts of concrete, 2 parts of anchor rods, 3 parts of backfill concrete, 4 parts of municipal corrugated pipes, 5 parts of reinforced concrete slab beams, 6 parts of steel arch reinforcing support and middle pipe shed advanced support, 7 parts of concrete, 8 parts of waste rubber tires, 9 parts of water passing channels.
Detailed Description
The invention will be further described with reference to specific examples.
A construction method for crossing a large-scale vertical karst cave group tunnel comprises the following specific implementation steps:
firstly, removing dangerous rock falling rocks locally existing on the karst cave rock wall, adopting sprayed C20 surface protection concrete 1 to protect, enlarging and digging a section at a vertical cave opening to serve as an operation channel, and taking the later stage as an inspection cave.
And secondly, a large-scale vertical karst cave group adopts a treatment measure mainly based on backfilling, C20 backfill concrete 3 is adopted to perform pouring and backfilling on a platform above a position of about 48m of a vertical solution cavity of a tunnel face, a water channel 9 is reserved, anchor rods 2 are applied to surrounding rock walls to be embedded into rock bodies before the backfill concrete 3 is poured, and the integrity of the backfill concrete 3 and the solution cave walls is improved.
And thirdly, expanding and digging the karst cave face to a V-level surrounding rock support type section, setting an I20a steel arch frame, adding an advanced small guide pipe into a Shi Zuo pipe shed, grouting, and carrying out steel arch frame and middle pipe shed reinforcing support 6.
And fourthly, after the construction of the lower step excavation supporting construction is 25 meters, returning to excavate the karst cave section to the tunnel bottom to construct the reinforced concrete slab beam 5.
Fifthly, constructing an arch wall lining, backfilling the lining with C20 concrete 7 within a range of 3m outside the contour line of the lining, blowing sand at the back and adding waste rubber tires 8 to serve as a buffer layer, and backfilling the lining to a height of 2m above the arch roof.
Furthermore, the municipal corrugated pipe 4 is pre-buried before backfilling the concrete 3 for the vertical karst cave group peripheral cracks and arch karst cave, and is led to the water channel 9.
The invention adopts the technical measure of reserving a water passage for backfilling concrete, and the aim of quickly and safely treating karst tunnels is achieved by strengthening and supporting the karst cave section and adopting the reinforced concrete beam plate structure to span the bottom of the karst cave section.
The foregoing is merely illustrative of the present invention, and the scope of the present invention is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the scope of the present invention, and therefore, the scope of the present invention shall be defined by the scope of the appended claims.

Claims (1)

1. A construction method for crossing a large vertical karst cave group tunnel is characterized by comprising the following steps: the construction steps are as follows: firstly, removing dangerous rock falling stones locally existing on the karst cave rock wall, adopting sprayed surface protection concrete (1) for protection, and enlarging a section of a vertical karst cave opening to serve as an operation channel and serve as an inspection cave in the later period; backfilling the platform above the vertical solution cavity 48m of the tunnel face by adopting a backfill concrete (3) pouring mode, reserving a water channel (9), applying anchor rods (2) to surrounding rock walls to embed rock bodies before pouring the backfill concrete (3), increasing the integral firmness of the backfill concrete (3) and the solution cavity walls, pre-burying municipal corrugated pipes (4) before the backfill concrete (3) for the surrounding cracks and the arch solution cavities of the vertical solution cavity group, and guiding the municipal corrugated pipes to the water channel (9); step three, expanding and digging a karst cave tunnel face to a V-level surrounding rock support type section, setting an I-steel arch frame, and applying a pipe shed and an advanced small guide pipe grouting advanced support (6); fourthly, after the excavation supporting construction of the lower step is 25 meters, returning to excavate the karst cave section to the bottom of the tunnel, and constructing a reinforced concrete slab beam (5); fifthly, constructing an arch wall lining, backfilling the lining contour line by adopting concrete (7) within 3m, blowing sand at the back and adding waste rubber tires (8) as buffer layers, and backfilling the arch wall lining to a height of 2m above the arch roof.
CN201710318576.6A 2017-05-08 2017-05-08 Construction method for crossing large-scale vertical karst cave group tunnel Active CN106988758B (en)

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CN111119938B (en) * 2019-12-30 2022-02-11 中交路桥华南工程有限公司 Method for processing karst cave at upper part of tunnel
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CN111706362A (en) * 2020-07-02 2020-09-25 天津大学 Karst cave treatment method for tunnel construction
CN111878088A (en) * 2020-07-30 2020-11-03 中铁五局集团有限公司 Karst cave section logistics channel construction method based on karst cave underground river environment tunnel construction
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