CN214697862U - Hydraulic tunnel excavation supporting construction - Google Patents
Hydraulic tunnel excavation supporting construction Download PDFInfo
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- CN214697862U CN214697862U CN202120342965.4U CN202120342965U CN214697862U CN 214697862 U CN214697862 U CN 214697862U CN 202120342965 U CN202120342965 U CN 202120342965U CN 214697862 U CN214697862 U CN 214697862U
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Abstract
The utility model discloses a hydraulic tunnel excavation supporting construction, including the main pipe canopy, the high one side of tunnel relief is provided with drilling anchor pile along the tunnel extending direction, the entrance to a cave both sides of tunnel are provided with drilling anchor pile, arched direction wall both ends set up on the drilling anchor pile of the entrance to a cave both sides of tunnel, be provided with a plurality of direction steel pipes on the direction wall, the steel flower pipe passes the direction steel pipe setting outside the tunnel excavation profile line, little pipe anchor is established at tunnel arch top, little pipe is the angle of inserting outward of settlement towards tunnel advancing direction and tunnel axis, the end that exposes of little pipe supports on the steel bow member. The utility model discloses need not excavate the relatively poor tunnel section of geological conditions greatly, reduce because of the open cut construction to natural environment's destruction, take place the problem of transversely slumping when solving tunnel side direction massif bias voltage and leading to excavating the tunnel, avoid the emergence of artificial geological disasters, do not influence the production life of other construction operations of tunnel construction area and people.
Description
Technical Field
The utility model belongs to the technical field of hydraulic and hydroelectric engineering cavern construction, concretely relates to hydraulic tunnel excavation supporting construction.
Background
In the construction process of the hydraulic and hydroelectric engineering tunnel, the engineering geological conditions have great influence on the tunnel excavation scheme, wherein factors such as the stability of surrounding rocks, the strength of the surrounding rocks, the integrity of rock masses, underground water and the like directly determine the tunnel excavation process, the construction progress and the support type, particularly when V-type surrounding rocks, mountain body bias pressure and series construction problems such as a basement rock and a covering layer are encountered on the excavation section of the tunnel, the construction progress and the construction safety can not be ensured by conventional shotcrete support and framework support.
The tunnel construction area sometimes does not allow large excavation construction due to reasons such as ecological environment, landscape site protection and the like, sometimes has no large excavation construction conditions due to human activities such as transportation, production and life and the like, and when the design scheme has to adopt a tunnel form, the reasonable, effective, safe and economic excavation scheme is particularly important.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that overcome prior art's defect, provide a hydraulic tunnel excavation supporting construction, solve the tunnel excavation in-process because of meeting unfavorable stratum, landslide body, mountain body bias voltage, tunnel excavation section lower part for basement rock and well upper portion probably cause the construction technological problem of excavation section stratum unstability for series of reasons such as overburden.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts is:
the utility model provides a hydraulic tunnel excavation supporting construction, including the big pipe shed, the high one side in tunnel relief is provided with the drilling anchor stake along the tunnel extending direction, the entrance to a cave both sides of tunnel are provided with the drilling anchor stake, arched guide wall both ends set up on the drilling anchor stake of the entrance to a cave both sides of tunnel, be equipped with the guide wall steelframe that constitutes by guide wall I-steel in the guide wall, be provided with a plurality of direction steel pipes on the guide wall steelframe, the big pipe shed includes the steel flower pipe, the steel flower pipe passes the direction steel pipe and sets up outside tunnel excavation profile line, little pipe anchor is established at tunnel hunch portion, little pipe is the angle of inserting outward towards tunnel advancing direction and tunnel axis, the end that exposes of little pipe supports on the steel hunch frame, steel hunch frame and a plurality of little pipe constitution supporting construction that correspond, excavation supporting construction sets up along tunnel direction interval, the tunnel inner wall is provided with the net of hanging sprays the concrete and struts, be provided with city type secondary lining in the tunnel.
As above the steel floral tube is connected by the screw thread by the tube coupling of different length and is constituteed, the hoop interval 40cm of steel floral tube, and the steel floral tube passes direction steel pipe setting 50cm departments outside the tunnel excavation profile line, and the steel floral tube is arranged in tunnel hunch portion 160 scope, and the outer inserted angle of steel floral tube is 2 and is 1 with tunnel bottom plate face angle with horizontal plane angle.
The small guide pipes are anchored in the range of 160 degrees at the top of the tunnel arch, the small guide pipes form an outward inserting angle of 10 degrees with the axis of the tunnel towards the advancing direction of the tunnel, the annular distance of the small guide pipes is 40cm, and the overlapping length between the small guide pipes of the adjacent excavation supporting structures is not less than 1.0 m.
As mentioned above, the steel arch comprises a plurality of sections of steel arch I-steel, small guide pipes are uniformly distributed in the tunnel corresponding to the arch end of each section of steel arch I-steel to serve as foot-locking anchor rods, and the exposed parts of the foot-locking anchor rods are folded by 90 degrees and are parallel to the water flow direction in the tunnel.
Compared with the prior art, the utility model, following beneficial effect has:
1) the utility model discloses need not excavate the relatively poor tunnel section of geological conditions greatly, reduce because of the open cut construction to natural environment's destruction, take place the problem of transversely slumping when solving tunnel side direction massif bias voltage and leading to excavating the tunnel, avoid the emergence of artificial geological disasters, do not influence the production life of other construction operations of tunnel construction area and people.
2) The drilling anchor piles are comprehensively arranged on one side with larger lateral pressure to penetrate into the bedrock, and the supporting structure of the small guide pipes and the steel arch form one-side integral support, so that the lateral collapse of the soil body at the top of the tunnel when the tunnel is excavated due to the bias of the mountain of the tunnel is prevented; the tunnel cavern excavation safety is guaranteed.
Drawings
FIG. 1 is a schematic view of a tunnel portal structure;
FIG. 2 is a schematic view of a tunnel excavation sequence;
FIG. 3 is a schematic view of the installation of the steel arch;
FIG. 4 is a schematic view of installation of I-shaped steel of the guide wall;
FIG. 5 is a schematic top view of a drilled anchor pile arrangement;
FIG. 6 is a schematic diagram of a side view of a drilled anchor pile arrangement;
FIG. 7 is a schematic cross-sectional view of a tunnel;
fig. 8 is a schematic view of the distribution of small catheters.
In the figure: 1-drilling anchoring piles; 2-large pipe shed; 3-a small catheter; 4-steel arch centering; 5-excavating a composite section; 6-hanging net and spraying concrete for supporting; 7-city door opening type secondary lining; 8-backfilling; 9-a guide wall; 10-a tunnel; 11-ground line; 12-bedrock line.
Detailed Description
To facilitate understanding and practice of the invention by those of ordinary skill in the art, the following detailed description of the invention is provided in connection with the examples, and it is to be understood that the examples described herein are for purposes of illustration and explanation only and are not intended to limit the invention.
Example 1:
a hydraulic tunnel excavation supporting structure comprises a drilling anchoring pile 1, a large pipe shed 2, a small pipe 3, a steel arch frame 4, a hanging net spraying concrete support 6, an urban door opening type secondary lining 7 and a guide wall 9.
High one side in tunnel 10 relief is provided with drilling anchor pile 1 along tunnel 10 extending direction, the entrance to a cave both sides of tunnel 10 are provided with drilling anchor pile 1, arched 9 both ends of guide wall set up on the drilling anchor pile 1 of the entrance to a cave both sides of tunnel 10, be provided with a plurality of direction steel pipes on the guide wall 9, big pipe shed 2 includes the steel floral tube, the steel floral tube passes the direction steel pipe setting outside tunnel excavation profile line, little pipe 3 anchor is established at tunnel hunch portion, little pipe 3 is towards tunnel advancing direction and tunnel axis and is set for the angle of inserting outward, little pipe 3 exposes the end and supports on steel bow member 4, steel bow member 4 and a plurality of little pipe 3 that correspond constitute excavation supporting structure, excavation supporting structure sets up along tunnel direction interval, the tunnel inner wall is provided with the string net and sprays concrete 6, be provided with door city type secondary lining 7 in the tunnel.
A guide wall steel frame consisting of I-shaped guide wall steel is arranged in the guide wall 9, and a plurality of guide steel pipes are arranged on the guide wall steel frame.
And a steel reinforcement cage is arranged in the steel flower tube.
The steel floral tube is connected by the screw thread by the tube coupling of different length and is constituteed, and the hoop interval 40cm of steel floral tube, steel floral tube pass direction steel pipe setting 50cm departments outside the tunnel excavation profile line, and the steel floral tube is arranged at tunnel hunch portion 160 scopes, and the outer inserted angle of steel floral tube is 2 and is 1 with tunnel bottom plate face angle with horizontal angle.
The small guide pipes 3 are anchored in the range of 160 degrees at the top of the tunnel arch, the small guide pipes 3 form a 10-degree external insertion angle with the axis of the tunnel towards the advancing direction of the tunnel, the circumferential distance of the small guide pipes 3 is 40cm, and the lap joint length between the small guide pipes 3 of adjacent excavation supporting structures is not less than 1.0 m.
The steel arch frame 4 comprises a plurality of sections of steel arch frame I-steel, small guide pipes 3 are uniformly distributed in the tunnel corresponding to the arch end of each section of steel arch frame I-steel to serve as foot locking anchor rods, and the exposed parts of the foot locking anchor rods are folded by 90 degrees and are parallel to the water flow direction in the tunnel.
Firstly, drilling anchor pile 1:
the high side of the tunnel 10 is provided with drilling anchor piles 1 along the extending direction of the tunnel 10, the two sides of the opening of the tunnel 10 are provided with the drilling anchor piles 1, the guide wall 9 is arched, the two ends of the guide wall 9 are arranged on the drilling anchor piles 1 at the two sides of the opening of the tunnel 10,
in order to prevent the tunnel 10 from transversely collapsing when the tunnel 10 is excavated due to the lateral mountain bias, the drilled anchoring pile 1 is arranged laterally (on the side with high terrain) of the tunnel 10, the small guide pipe 3 is arranged and welded with the steel arch frame 4, and the diameter of the drilled anchoring pile 1 is 1-1.5m and extends into the bedrock 3-5.0 m. The bored anchor piles 1 on both sides of the opening of the tunnel 10 serve as the foundation of the guide wall 9 and form an entrance arch with the guide wall 9.
II, a guide wall 9:
the guide wall 9 is in an arch shape of 163 degrees, a guide wall steel frame consisting of 3 guide wall I-shaped steels is arranged in the guide wall 9, a plurality of guide steel pipes are arranged on the guide wall steel frame and are welded with the guide wall steel frame, the length of each guide steel pipe is 140mm, and the thickness of each guide steel pipe is 4 mm; the I-shaped steel of the guide wall is welded through a connecting plate.
Thirdly, large pipe shed 2:
the large pipe shed 2 adopts a hot-rolled seamless steel flower pipe with the diameter of 108 mm multiplied by 8mm, the steel flower pipe is formed by connecting pipe sections with the length of 3m and 5m by screw threads, and the overlapping length of the screw threads is 15 cm. The hoop interval 40cm of steel floral tube, steel floral tube pass direction steel pipe setting 50cm departments outside tunnel excavation profile line, arrange at tunnel hunch portion 160 scope, the outer inserted angle of steel floral tube is 2 and is 1 with tunnel bottom plate face angle with horizontal plane angle. In order to improve the bending resistance of the pipe shed, a steel reinforcement cage is arranged in the steel flower pipe and comprises four main reinforcements and a plurality of fixing rings, the diameter of each main reinforcement is 22mm, the main reinforcements are arranged in the steel flower pipe, and the fixing rings are adopted
The length of short tube coupling is 5cm, and solid fixed ring distributes along steel floral tube internal interval 1.5m, and each solid fixed ring all welds with four main muscle. The number of joints in the same section of the guide steel pipe and the steel perforated pipe is not more than 50 percent of the total number of the guide steel pipe and the steel perforated pipe.
Fourth, small duct 3:
the small guide pipes 3 are anchored in the range of 160 degrees at the top of the tunnel arch, the small guide pipes 3 form a 10-degree outward inserting angle with the axis of the tunnel towards the advancing direction of the tunnel, the exposed ends of the small guide pipes 3 need to be supported on the steel arch frames 4 close to the excavation surface, the small guide pipes 3 and the steel arch frames 4 form an excavation supporting structure, grouting is carried out on surrounding rocks to the front through the small guide pipes 3, slurry penetrates into the surrounding rocks, the surrounding rocks within a certain range can be reinforced, and the surrounding rocks can be supported. Little pipe 3 adopts diameter 42mm, the hot rolling seamless steel pipe of pipe wall 3.5mm, hoop interval 40cm, the long L of pipe is 3.5m, little pipe 3 cooperation steel bow member 4 uses, 34 little pipe 3 are laid to every section, steel bow member 4 constitutes excavation supporting construction with a plurality of little pipe 3 that correspond, excavation supporting construction sets up every 2 meters along the tunnel direction, excavate 2 meters as a circulation promptly after driving into one row of little pipe 3, then drive into next row little pipe 3 once more, analogize in proper order, overlap joint length between the little pipe 3 of adjacent excavation supporting construction is not less than 1.0 m.
Five, steel arch frame 4, hanging net spraying concrete support 6
The steel arch frame 4 is made of Q235B H-shaped steel, the type of the H-shaped steel is I20a, each steel arch frame 4 comprises a plurality of sections of steel arch frame H-shaped steel, each section of steel arch frame H-shaped steel comprises 3 sections of arch top H-shaped steel, 2 sections of arch side H-shaped steel and 1 section of arch bottom H-shaped steel, and the arch bottom H-shaped steel is only used as a primary support and is required to be taken down when a tunnel body is secondarily lined.
The connecting part of each section of steel arch frame I-steel is provided with 2 small guide pipes 3 as foot locking anchor rods, namely the tunnel corresponding to the arch end of each section of steel arch frame I-steel is uniformly provided with the small guide pipes 3, and the tunnel body section can enter the tunnel to be excavated after the construction of the large pipe shed 2 and the small guide pipes 3.
The tunnel is designed to have a water passing section with a city gate hole shape, and the tunnel is suitable for excavation of horseshoe-shaped sections with poor geological conditions and large mountain rock pressure bearing capacity in consideration of construction safety. And excavating the cavern by adopting a reserved core soil seven-step excavation method. The footage of each cycle of cavity excavation is not more than 50cm, after each cycle of excavation is finished, concrete is sprayed in one time, and the excavation is preferably carried out by adopting manpower as a main part and mechanical assistance.
Excavating a layer of support in each cycle, after excavating the upper half part of a chamber of the tunnel, spraying concrete for one time (3-5 cm), then installing arch crown I-steel of a steel arch frame 4, arranging 2 small guide pipes 3 at two sides of the arch end of the arch crown I-steel as foot-locking anchor rods, enabling the foot-locking anchor rods to enter a rock for 2.5m, extending 1.0m outwards, and after grouting is finished, folding the exposed parts of the foot-locking anchor rods for 90 degrees to be parallel to the water flow direction in the tunnel; and (4) supporting the arch crown part by using a core soil platform reserved during excavation.
After the arch crown I-shaped steel is installed and fixed, a reinforcing mesh with the aperture phi of 8mm is installed, a system mortar anchor rod with the diameter phi of 25mm is drilled, and C20 concrete is sprayed for supporting to form a top suspended net sprayed concrete support. And excavating and supporting according to the area I, constructing the area II, the area III, the area IV and the area V in sequence, installing a reinforcing mesh sheet with the aperture phi of 8mm, drilling a system mortar anchor rod with the diameter phi of 25mm, spraying C20 concrete for supporting to form a side part net hanging and spraying concrete support 6, excavating core soil of the area VI (comprising the area VI-1, the area VI-2 and the area VI-3) and the area VII, and installing arch bottom I-shaped steel of the steel arch frame 4.
Sixth, secondary lining 7 forming
After the tunnel excavation is finished, an urban door opening type secondary lining 7 is arranged in the tunnel, and the secondary lining section is an urban door opening type water passing section.
It should be noted that the embodiments described in this application are only examples to illustrate the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (4)
1. A hydraulic tunnel excavation supporting structure comprises a large pipe shed (2) and is characterized in that a drilling anchoring pile (1) is arranged on one high side of the tunnel (10) along the extending direction of the tunnel (10), drilling anchoring piles (1) are arranged on two sides of a tunnel opening of the tunnel (10), two ends of an arched guide wall (9) are arranged on the drilling anchoring piles (1) on two sides of the tunnel opening of the tunnel (10), a guide wall steel frame consisting of I-shaped guide wall steel is arranged in the guide wall (9), a plurality of guide steel pipes are arranged on the guide wall steel frame, the large pipe shed (2) comprises steel flower pipes, the steel flower pipes penetrate through the guide steel pipes and are arranged outside a tunnel excavation contour line, small guide pipes (3) are anchored at the top of a tunnel arch, the small guide pipes (3) form a set outer inserting angle with the tunnel axis in the advancing direction of the tunnel, the exposed ends of the small guide pipes (3) are supported on a steel arch (4), and the steel arch (4) and a plurality of corresponding small guide pipes (3) form a supporting structure, the excavation supporting structure is arranged at intervals along the direction of the tunnel, the inner wall of the tunnel is provided with a hanging net and sprayed with concrete supports (6), and the tunnel is internally provided with a city gate hole type secondary lining (7).
2. The hydraulic tunnel excavation supporting structure of claim 1, wherein the steel perforated pipe is formed by connecting pipe joints with different lengths through screw threads, the circumferential distance of the steel perforated pipe is 40cm, the steel perforated pipe passes through the guide steel pipe and is arranged 50cm outside a tunnel excavation contour line, the steel perforated pipe is arranged in a tunnel arch part range of 160 degrees, and the outer insertion angle of the steel perforated pipe is 2 degrees from the horizontal plane and 1 degree from the bottom plate surface of the tunnel.
3. The hydraulic tunnel excavation supporting structure of claim 1, wherein the small guide pipes (3) are anchored in the range of 160 degrees of the tunnel arch top, the small guide pipes (3) form an outward inserting angle of 10 degrees with the tunnel axis towards the advancing direction of the tunnel, the circumferential distance of the small guide pipes (3) is 40cm, and the overlapping length between the small guide pipes (3) of the adjacent excavation supporting structures is not less than 1.0 m.
4. The hydraulic tunnel excavation supporting structure of claim 1, wherein the steel arch (4) comprises a plurality of sections of steel arch joist steel, small pipes (3) are uniformly distributed in the tunnel corresponding to the arch end of each section of steel arch joist steel to serve as foot-locking anchor rods, and the exposed parts of the foot-locking anchor rods are folded by 90 degrees and are parallel to the water flow direction in the tunnel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120342965.4U CN214697862U (en) | 2021-02-04 | 2021-02-04 | Hydraulic tunnel excavation supporting construction |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120342965.4U CN214697862U (en) | 2021-02-04 | 2021-02-04 | Hydraulic tunnel excavation supporting construction |
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| CN214697862U true CN214697862U (en) | 2021-11-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115045299A (en) * | 2022-07-26 | 2022-09-13 | 杭州市西站枢纽开发有限公司 | Deep and large foundation pit side wall reinforcing structure with electroosmosis drainage function and construction method |
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2021
- 2021-02-04 CN CN202120342965.4U patent/CN214697862U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115045299A (en) * | 2022-07-26 | 2022-09-13 | 杭州市西站枢纽开发有限公司 | Deep and large foundation pit side wall reinforcing structure with electroosmosis drainage function and construction method |
| CN115045299B (en) * | 2022-07-26 | 2024-02-02 | 杭州市西站枢纽开发有限公司 | Deep foundation pit side wall reinforcing structure with electroosmosis drainage function and construction method |
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