CN213743435U - Step multiple leading small conduit arrangement structure - Google Patents
Step multiple leading small conduit arrangement structure Download PDFInfo
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- CN213743435U CN213743435U CN202022536841.8U CN202022536841U CN213743435U CN 213743435 U CN213743435 U CN 213743435U CN 202022536841 U CN202022536841 U CN 202022536841U CN 213743435 U CN213743435 U CN 213743435U
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Abstract
The utility model relates to a ladder multiple advanced small conduit arrangement structure, belonging to the technical field of tunnel engineering, wherein a row of small conduits are arranged in the 150-degree range of a tunnel arch part, a plurality of rows of small conduits are arranged along the longitudinal direction of a tunnel, and two adjacent rows of small conduits are longitudinally lapped by 3 m; the circumferential spacing of the small guide pipes in the same row is 0.2 m. The utility model discloses simple structure, advance support is good, can prevent effectively that the country rock from warping, does benefit to and guarantees that the tunnel face is stable, avoids tunnel landslide.
Description
Technical Field
The utility model relates to a tunnel engineering technical field especially relates to the multiple advanced little pipe arrangement structure of ladder.
Background
With the increasing urban population and urban scale, subways have become important transportation and regional hub tools for large cities. In recent years, with the continuous development of subway lines, the overlapping of multi-line subways in different space areas becomes the technical difficulty and the key point of municipal engineering construction. Particularly, the technical difficulty of ultra-small clear distance construction between tunnels is more prominent in municipal engineering.
When the ultra-small clear distance construction between tunnels is carried out, if the preliminary bracing construction is not carried out in time or is not carried out perfectly, the deformation of surrounding rocks may exceed the allowable range, and tunnel face instability and tunnel collapse are caused in serious cases, so that great economic loss is caused.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve above-mentioned technical problem and provide the multiple advanced little pipe arrangement structure of ladder.
The utility model discloses a following technical scheme realizes:
the step multiple advanced small conduit arrangement structure is characterized in that a row of small conduits are arranged in the arch part of a tunnel within the range of 120-180 degrees, a plurality of rows of small conduits are arranged along the longitudinal direction of the tunnel, and two adjacent rows of small conduits are longitudinally overlapped by 2-4 m.
Preferably, a row of small ducts is drilled within 150 ° of the tunnel arch.
Preferably, two adjacent rows of small conduits overlap longitudinally by 3 m.
Further preferably, the circumferential spacing of the small ducts of the same row is 0.2 m.
Preferably, the outer insertion angle of the small guide pipe is 15-20 degrees.
Furthermore, a row of small guide pipes are arranged for each two steel frames.
Further preferably, a row of small ducts is provided at intervals of 1m in the longitudinal direction of the tunnel.
Preferably, the small conduit is a seamless steel pipe with a diameter of 42 mm.
Further preferably, the small catheter has a wall thickness of 3.5mm and a length of 3.5m-4 m.
Furthermore, one end of the small conduit is a conical tip, the other end of the small conduit is connected with an iron hoop, and a plurality of grouting holes are formed in the pipe body of the small conduit.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses simple structure, advance support is good, can prevent effectively that the country rock from warping, does benefit to and guarantees that the tunnel face is stable, avoids tunnel landslide.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention.
FIG. 1 is a plan view of an overlapping section of a tunnel;
fig. 2 is a schematic structural diagram of the present invention;
fig. 3 is a schematic view of the structure of a small catheter.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
This embodiment relies on the subway line that fig. 1 shows, introduces the utility model discloses a multiple leading little pipe arrangement structure of ladder. In fig. 1, the length of the overlapping area of the number 6 line of the underground excavated tunnel and the number 9 line of the shield is 51 meters; the line is in the east-west trend, and No. 9 line is on, and No. 6 line is under. And constructing the No. 6 line after the shield such as the No. 9 line and the like passes on the site, wherein the thickness of the interlayer soil between the overlapped tunnels of the No. 6 line and the No. 9 line is about 2.3 m.
For the overlapped section of the No. 6 line underground excavation tunnel, adopting an annular step method to reserve core soil for excavation, carrying out combined primary support by a spraying, anchoring, net and steel frame, protecting along with excavation, and following the working face. And performing advanced grouting on the non-excavated section, performing back grouting on the supported section, forming a load bearing system by the primary support, the middle soil layer and the surrounding rock, and cooperatively deforming to bear the load, thereby fully exerting the self-bearing capacity of the surrounding rock.
As shown in figure 2, the utility model discloses a multiple leading little pipe arrangement structure of ladder before excavating the overlapping section of No. 6 lines, beats at the hunch portion of No. 6 line tunnels and establishes one row of little pipe 21 within the range of 120-180. The small catheters 21 are arranged in an encrypted manner, and the circumferential distance is 0.2 m.
A row of small ducts are arranged on each two steel frames 22 to be supported, grouting is carried out, and the small ducts 21 are longitudinally overlapped by 2-4 m, so that a step multiple advanced small duct structure is formed, and the supporting effect is enhanced. Preferably, the small guide pipe 21 is arranged in the arch part of the No. 6 tunnel within 150 degrees, and the small guide pipe 21 is longitudinally overlapped by 3 m.
The small guide pipe 21 adopts a seamless steel pipe with the diameter of 42mm, the wall thickness is 3.5mm, and the length is 3.5 m-4.0 m. The length of each steel frame is 0.5m, and the external insertion angle of the small guide pipe 21 is 15-20 degrees.
As shown in fig. 3, one end of the small conduit 21 is made into a tapered shape, and the other end is welded with an iron hoop 23. The length of the cone tip is 0.1 m. A plurality of grouting holes 24 are arranged on the pipe body of the small guide pipe 21, and the grouting holes 24 are arranged in a quincunx shape at intervals of 0.2m along the pipe wall; the holes are mutually 90 degrees, and the aperture is 6-8 mm.
The grouting holes 24 are arranged from a position 0.5-1.0 m away from the iron hoop to the conical tip.
The utility model discloses simple structure, advance support is good, can prevent effectively that the country rock from warping, does benefit to and guarantees that the tunnel face is stable, avoids tunnel landslide.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. The multiple leading little pipe arrangement structure of ladder, its characterized in that: arranging a row of small guide pipes in the range of 120-180 degrees at the arch part of the tunnel, arranging a plurality of rows of small guide pipes along the longitudinal direction of the tunnel, and longitudinally overlapping two adjacent rows of small guide pipes by 2-4 m; a row of small guide pipes are arranged for supporting two steel frames.
2. The stepped multiple lead ductule arrangement according to claim 1, wherein: a row of small ducts are arranged in the range of 150 degrees of the arch part of the tunnel.
3. The stepped multiple lead ductule arrangement according to claim 1, wherein: two adjacent rows of small ducts are longitudinally overlapped by 3 m.
4. The stepped multiple lead ductule arrangement according to claim 1, 2 or 3, wherein: the circumferential spacing of the small guide pipes in the same row is 0.2 m.
5. The stepped multiple lead ductule arrangement according to claim 1, 2 or 3, wherein: the outer insertion angle of the small guide pipe is 15-20 degrees.
6. The stepped multiple lead ductule arrangement according to claim 1, wherein: a row of small conduits is arranged at intervals of 1m along the longitudinal direction of the tunnel.
7. The stepped multiple lead ductule arrangement according to claim 1, wherein: the small guide pipe is a seamless steel pipe with the diameter of 42 mm.
8. The stepped multiple lead ductule arrangement according to claim 1 or 7, wherein: the wall thickness of the small catheter is 3.5mm, and the length of the small catheter is 3.5m-4 m.
9. The stepped multiple lead ductule arrangement according to claim 1 or 7, wherein: one end of the small guide pipe is a conical tip, the other end of the small guide pipe is connected with an iron hoop, and a plurality of grouting holes are formed in the pipe body of the small guide pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022536841.8U CN213743435U (en) | 2020-11-05 | 2020-11-05 | Step multiple leading small conduit arrangement structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022536841.8U CN213743435U (en) | 2020-11-05 | 2020-11-05 | Step multiple leading small conduit arrangement structure |
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| Publication Number | Publication Date |
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| CN213743435U true CN213743435U (en) | 2021-07-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022536841.8U Active CN213743435U (en) | 2020-11-05 | 2020-11-05 | Step multiple leading small conduit arrangement structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112177635A (en) * | 2020-11-05 | 2021-01-05 | 中国建筑第四工程局有限公司 | Construction method of step multiple advanced small guide pipe and construction method of overlapped tunnel |
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2020
- 2020-11-05 CN CN202022536841.8U patent/CN213743435U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112177635A (en) * | 2020-11-05 | 2021-01-05 | 中国建筑第四工程局有限公司 | Construction method of step multiple advanced small guide pipe and construction method of overlapped tunnel |
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