CN109667620B - Tunnel surrounding rock wash-out pipe - Google Patents
Tunnel surrounding rock wash-out pipe Download PDFInfo
- Publication number
- CN109667620B CN109667620B CN201910125026.1A CN201910125026A CN109667620B CN 109667620 B CN109667620 B CN 109667620B CN 201910125026 A CN201910125026 A CN 201910125026A CN 109667620 B CN109667620 B CN 109667620B
- Authority
- CN
- China
- Prior art keywords
- pipe body
- surrounding rock
- reinforcing rib
- pipe
- wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000011435 rock Substances 0.000 title claims abstract description 76
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 44
- 230000003014 reinforcing effect Effects 0.000 claims description 64
- 239000002245 particle Substances 0.000 abstract description 9
- 230000008093 supporting effect Effects 0.000 abstract description 5
- 238000012545 processing Methods 0.000 description 4
- 239000008187 granular material Substances 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
- E21F16/02—Drainage of tunnels
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Abstract
The invention discloses a tunnel surrounding rock drainage pipe, belongs to the field of drainage tools of tunnel engineering, and aims to avoid the problem of wall collapse of a surrounding rock drainage guide hole and ensure the smoothness of drainage. The water drain pipe comprises a pipe body, wherein one end of the pipe body is a head end, the other end of the pipe body is a tail end, a cavity arranged along the axial direction of the pipe body is arranged on the pipe body, one end of the cavity adjacent to the tail end of the pipe body is closed, the other end of the cavity penetrates through the head end of the pipe body, and a water drain hole is formed in the pipe wall of the pipe body; the water outlet extends to the cavity along the radial direction of the pipe body in an inclined mode, and extends from the outer side to the inner side from the tail end to the head end of the pipe body along the axial direction of the pipe body. The tunnel surrounding rock drainage pipe has a supporting effect on the wall of the drilled surrounding rock, so that the phenomenon that the wall of the drilled surrounding rock collapses can be avoided; the drainage hole is obliquely arranged, so that the situation that surrounding rock particles enter the drainage hole to block the drainage hole is avoided, or the surrounding rock particles enter the pipe body through the drainage hole to cause the blockage of the drainage pipe, and the reliability of the drainage of the surrounding rock is ensured.
Description
Technical Field
The invention belongs to the field of tunnel engineering drainage tools, and particularly relates to a tunnel surrounding rock drainage pipe.
Background
With the rapid development of the traffic industry in China, the area range for building the tunnel is wider and wider, the environment for the tunnel to pass through the area is severe, the geological conditions are complex and changeable, and the tunnel is built in clay, fault, karst and other weak strata. In these weak strata, the surrounding rock water system is developed, which seriously affects the tunnel excavation, so that the surrounding rock water needs to be guided and discharged in time during the tunnel excavation. At present, a drainage guide hole is drilled to a water layer of surrounding rock, water in the surrounding rock is led out through the drainage guide hole, however, in a weak formation area, after the drainage guide hole is drilled, due to the weakness of the surrounding rock, the hole wall of the drainage guide hole is easy to collapse, so that the drainage function is influenced, and the stability of the surrounding rock is also influenced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a tunnel surrounding rock drainage pipe, which avoids the problem of collapse of the wall of a surrounding rock drainage guide hole and ensures the smoothness of drainage.
The technical scheme adopted by the invention is as follows: the tunnel surrounding rock water drain pipe comprises a pipe body, wherein one end of the pipe body is a head end, the other end of the pipe body is a tail end, a cavity arranged along the axial direction of the pipe body is arranged on the pipe body, one end of the cavity adjacent to the tail end of the pipe body is closed, and the other end of the cavity penetrates through the head end of the pipe body; the pipe wall of the pipe body is provided with a water drainage hole, the water drainage hole extends to the cavity along the radial direction of the pipe body in an inclined mode, and the water drainage hole extends from the outer side to the inner side from the tail end of the pipe body to the side where the head end is located along the axial direction of the pipe body.
Furthermore, the included angle between the water drainage hole and the axis of the pipe body is an inclined angle, the inclined angle is phi, and the phi is smaller than the effective friction angle of the surrounding rock.
Further, the wall thickness of the pipe body is t, the aperture of the drain hole is d, and t is larger than d/cos phi.
Furthermore, the aperture of the drainage hole is 6-18 mm.
Furthermore, the water drainage holes are distributed on the pipe wall of the pipe body in a quincunx shape.
Further, along the axial direction of the pipe body, the pipe body comprises a non-hole section adjacent to the head end and a hole section adjacent to the tail end; the water drainage hole is arranged on the perforated section.
Furthermore, a plurality of reinforcing ribs are arranged on the outer wall of the pipe body, the plurality of reinforcing ribs are uniformly distributed along the circumferential direction of the pipe body, and each reinforcing rib is arranged in parallel with the axial direction of the pipe body and is arranged in an area between adjacent water drainage holes.
Further, a reinforcing rib is provided on the outer wall of the pipe body, the reinforcing rib spirally extends around the outer circumference of the pipe body in the axial direction of the pipe body, and the reinforcing rib is provided in a region between adjacent drainage holes.
Further, the reinforcing rib is welded to the outer wall of the pipe body.
Further, the tail end of the pipe body is conical.
The invention has the beneficial effects that: the tunnel surrounding rock drainage pipe has a supporting effect on the wall of the drilled surrounding rock, so that the phenomenon that the wall of the drilled surrounding rock collapses can be avoided; the drainage hole is obliquely arranged, so that the situation that surrounding rock particles enter the drainage hole to block the drainage hole is avoided, or the surrounding rock particles enter the pipe body through the drainage hole to cause the blockage of the drainage pipe, and the reliability of the drainage of the surrounding rock is ensured.
The arrangement of the peripheral reinforcing ribs increases the distance between the drain pipe and the surrounding rock, increases the drainage space belt and has the function of accelerating drainage.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a top view of FIG. 1;
fig. 3 is a schematic structural diagram of a second embodiment of the present invention.
In the figure, a pipe body 1, a non-porous section 11, a porous section 12, a cavity 2, a drain hole 3 and a reinforcing rib 4.
Detailed Description
The invention is further described below with reference to the following figures and examples:
the tunnel surrounding rock water drain pipe comprises a pipe body 1, wherein one end of the pipe body 1 is a head end, the other end of the pipe body 1 is a tail end, a cavity 2 arranged along the axial direction of the pipe body 1 is arranged on the pipe body 1, one end of the cavity 2 adjacent to the tail end of the pipe body 1 is closed, and the other end of the cavity penetrates through the head end of the pipe body 1; the pipe wall of the pipe body 1 is provided with a water drainage hole 3, the water drainage hole 3 extends to the cavity 2 along the radial direction of the pipe body 1 in an inclined mode, and the water drainage hole 3 extends from the outer side to the inner side from the tail end to the head end of the pipe body 1 along the axial direction of the pipe body 1.
When the tunnel surrounding rock drain pipe disclosed by the invention is used, firstly, a drilling machine is used for drilling holes in the upper part, then the pipe body 1 of the drain pipe is inserted into the drilled holes, water in the surrounding rock permeates into the cavity 2 of the pipe body 1 through the drain holes 3 on the pipe body 1, and finally, the water is discharged from the head end of the pipe body 1 along the cavity 2.
The tunnel surrounding rock drainage pipe has a supporting effect on the wall of the drilled surrounding rock, so that the phenomenon that the wall of the drilled surrounding rock collapses can be avoided; the 3 slope settings of outlet, avoid the surrounding rock granule to get into outlet 3 and block up outlet 3, perhaps the surrounding rock granule passes through in outlet 3 gets into body 1, causes the outlet pipe to block up, has guaranteed the smooth and easy nature and the reliability of surrounding rock sluicing.
In order to more effectively avoid surrounding rock particles from entering the drain hole 3, preferably, an included angle between the drain hole 3 and the axis of the pipe body 1 is an inclined angle, the inclined angle is Φ, and the Φ is smaller than an effective friction angle of the surrounding rock.
Wherein the effective friction angle of the surrounding rock is obtained through experiments. And in the effective friction angle range, the surrounding rock particles are stably stacked and are not easy to enter the water drainage holes 3.
In order to adapt to the size of the surrounding rock particles and further avoid the surrounding rock particles from entering the drainage holes 3, the diameter of each drainage hole 3 is preferably 6-18 mm.
In order to facilitate the introduction of water into the tubular body 1 through the drainage openings 3, the drainage openings 3 are preferably arranged in a quincunx pattern on the wall of the tubular body 1.
If the pipe wall of body 1 is thinner, not only be convenient for process outlet 3, simultaneously, the outlet 3's of processing length is shorter for its gradient can be ignored, thereby loses the function of avoiding the surrounding rock granule to get into. In order to ensure the length of the drain hole 3 and further avoid surrounding rock particles from entering the pipe body 1, it is preferable that the wall thickness of the pipe body 1 is t, the aperture of the drain hole 3 is d, and the inclination angle of the drain hole 3 is Φ; then t > d/cos Φ.
Along the axial direction of the pipe body 1, drain holes 3 can be uniformly distributed on the pipe wall of the pipe body 1, preferably, along the axial direction of the pipe body 1, the pipe body 1 comprises a non-porous section 11 adjacent to the head end and a porous section 12 adjacent to the tail end; the weep holes 3 are provided in the perforated section 12.
During tunnel construction, the outer water of country rock is easily led and is arranged, need not to use the drain pipe alright realize the outer water of country rock leading and arranging, so, need not 11 processing outlet 3 in the sclausura section of body 1, reduce the processing cost, simultaneously, when leading and arranging the water of country rock depths, the water of leading-in cavity 2 need be followed the head end of body 1 and discharged, if at 11 processing holes in sclausura section, the water in cavity 2 easily anti-infiltrates into the country rock skin, and set up outlet 3 in foraminiferous section 12 and then avoided above-mentioned problem.
In order to facilitate the water energy in the surrounding rock to rapidly penetrate into the drainage hole 3, the water energy is introduced into the cavity 2 of the pipe body 1 through the drainage hole 3, preferably, as shown in fig. 1 and fig. 2, a reinforcing rib 4 is arranged on the outer wall of the pipe body 1, the arrangement is such that, after the drainage pipe is inserted into the surrounding rock, the reinforcing rib 4 abuts against the hole wall of the surrounding rock, so that a certain gap exists between the outer wall of the pipe body 1 and the surrounding rock, and the existence of the gap enables the water in the surrounding rock around the pipe body 1 to be collected to the gap, so that the water pressure in the gap is increased, thereby increasing the pressure difference between the inner side and the outer side of the pipe body 1, and under the action of the water pressure, the water in the gap rapidly enters the cavity 2 through the drainage hole 3, thereby accelerating the water drainage speed of the surrounding. The reinforcing rib 4 has many, and many reinforcing ribs 4 are along 1 circumference evenly distributed of body, and each reinforcing rib 4 is on a parallel with 1 axial setting of body and all sets up in the region between adjacent outlet 3 for reinforcing rib 4 avoids outlet 3 to set up, can avoid reinforcing rib 4 to block outlet 3, influences the drainage ability of outlet 3.
Of course, as shown in fig. 3, the reinforcing ribs 4 may extend in the axial direction of the pipe body 1 spirally around the outer circumference of the pipe body 1, and the reinforcing ribs 4 are provided in the area between the adjacent drainage holes 3. If the reinforcing rib 4 has a spiral shape, only one reinforcing rib 4 may be provided. When the reinforcing rib 4 is in a spiral shape, the water drainage holes 3 can be distributed on the outer wall of the pipe body 1 in a plum blossom shape; also can set up a set of outlet 3 around body 1 circumference in the region between every adjacent twice spiral, in this set of outlet 3, each outlet 3 can misplace and arrange, also can distribute in the same section position of body 1.
According to the structure, firstly, the reinforcing rib 4 is arranged to prevent the pipe wall of the pipe body 1 from directly contacting with a surrounding rock stratum, and the reinforcing rib 4 is spiral, so that a drainage space belt is formed by surrounding the bend of the reinforcing rib 4, the surrounding rock stratum and the pipe wall of the pipe body 1, and the reinforcing rib 4 is arranged in an area between adjacent drainage holes 3, namely the drainage holes 3 are distributed in the bend area of the reinforcing rib 4, so that collected water of the drainage space belt can be drained into the drainage holes 3 quickly; secondly, the reinforcing rib 4 spirally extends along the axial direction of the pipe body 1 around the periphery of the pipe body 1, namely, the supporting force of the reinforcing rib 4 to the hole wall of the drilled surrounding rock is spirally distributed along the axial direction, and the supporting force of the hole wall of the surrounding rock is distributed more uniformly; finally, the helical reinforcing ribs 4 provide a better reinforcing effect for the tubular body 1.
Preferably, the reinforcing ribs 4 are welded to the outer wall of the pipe body 1.
In order to facilitate the insertion of the downcomer into the surrounding rock, it is preferred that the end of the pipe body 1 is conical.
Claims (16)
1. Tunnel country rock wash-out pipe, its characterized in that: the pipe comprises a pipe body (1), wherein one end of the pipe body (1) is a head end, the other end of the pipe body is a tail end, a cavity (2) which is axially arranged along the pipe body (1) is arranged on the pipe body (1), one end of the cavity (2) which is adjacent to the tail end of the pipe body (1) is closed, and the other end of the cavity penetrates through the head end of the pipe body (1); be provided with outlet (3) on the pipe wall of body (1), outlet (3) extend to cavity (2) along body (1) radial slope, and along body (1) axial, outlet (3) are by outer to interior by body (1) end to head end place side extension.
2. The tunnel surrounding rock downcomer of claim 1, wherein: the included angle between the drain hole (3) and the axis of the pipe body (1) is an inclined angle, the inclined angle is phi, and the phi is smaller than the effective friction angle of the surrounding rock.
3. The tunnel surrounding rock downcomer of claim 2, wherein: the wall thickness of the pipe body (1) is t, the aperture of the drain hole (3) is d, and t is larger than d/cos phi.
4. The tunnel surrounding rock downcomer of claim 1, 2 or 3, wherein: the aperture of the water drainage hole (3) is 6-18 mm.
5. The tunnel surrounding rock downcomer of claim 1, 2 or 3, wherein: the water drainage holes (3) are distributed on the pipe wall of the pipe body (1) in a quincunx shape.
6. The tunnel surrounding rock downcomer of claim 1, 2 or 3, wherein: along the axial direction of the pipe body (1), the pipe body (1) comprises a non-porous section (11) adjacent to the head end and a porous section (12) adjacent to the tail end; the water drainage hole (3) is arranged on the perforated section (12).
7. The tunnel surrounding rock downcomer of any one of claims 1-3, wherein: the reinforcing rib structure is characterized in that reinforcing ribs (4) are arranged on the outer wall of the pipe body (1), a plurality of reinforcing ribs (4) are arranged, the plurality of reinforcing ribs (4) are uniformly distributed along the circumferential direction of the pipe body (1), and each reinforcing rib (4) is parallel to the axial direction of the pipe body (1) and is arranged in an area between adjacent drainage holes (3).
8. The tunnel surrounding rock downcomer of claim 4, wherein: the reinforcing rib structure is characterized in that reinforcing ribs (4) are arranged on the outer wall of the pipe body (1), a plurality of reinforcing ribs (4) are arranged, the plurality of reinforcing ribs (4) are uniformly distributed along the circumferential direction of the pipe body (1), and each reinforcing rib (4) is parallel to the axial direction of the pipe body (1) and is arranged in an area between adjacent drainage holes (3).
9. The tunnel surrounding rock downcomer of claim 5, wherein: the reinforcing rib structure is characterized in that reinforcing ribs (4) are arranged on the outer wall of the pipe body (1), a plurality of reinforcing ribs (4) are arranged, the plurality of reinforcing ribs (4) are uniformly distributed along the circumferential direction of the pipe body (1), and each reinforcing rib (4) is parallel to the axial direction of the pipe body (1) and is arranged in an area between adjacent drainage holes (3).
10. The tunnel surrounding rock downcomer of claim 6, wherein: the reinforcing rib structure is characterized in that reinforcing ribs (4) are arranged on the outer wall of the pipe body (1), a plurality of reinforcing ribs (4) are arranged, the plurality of reinforcing ribs (4) are uniformly distributed along the circumferential direction of the pipe body (1), and each reinforcing rib (4) is parallel to the axial direction of the pipe body (1) and is arranged in an area between adjacent drainage holes (3).
11. The tunnel surrounding rock downcomer of any one of claims 1-3, wherein: the reinforcing rib (4) is arranged on the outer wall of the pipe body (1), the reinforcing rib (4) spirally surrounds the periphery of the pipe body (1) and extends along the axial direction of the pipe body (1), and the reinforcing rib (4) is arranged in the area between the adjacent water drainage holes (3).
12. The tunnel surrounding rock downcomer of claim 4, wherein: the reinforcing rib (4) is arranged on the outer wall of the pipe body (1), the reinforcing rib (4) spirally surrounds the periphery of the pipe body (1) and extends along the axial direction of the pipe body (1), and the reinforcing rib (4) is arranged in the area between the adjacent water drainage holes (3).
13. The tunnel surrounding rock downcomer of claim 5, wherein: the reinforcing rib (4) is arranged on the outer wall of the pipe body (1), the reinforcing rib (4) spirally surrounds the periphery of the pipe body (1) and extends along the axial direction of the pipe body (1), and the reinforcing rib (4) is arranged in the area between the adjacent water drainage holes (3).
14. The tunnel surrounding rock downcomer of claim 6, wherein: the reinforcing rib (4) is arranged on the outer wall of the pipe body (1), the reinforcing rib (4) spirally surrounds the periphery of the pipe body (1) and extends along the axial direction of the pipe body (1), and the reinforcing rib (4) is arranged in the area between the adjacent water drainage holes (3).
15. The tunnel surrounding rock downcomer of claim 7, wherein: the reinforcing rib (4) is welded on the outer wall of the pipe body (1).
16. The tunnel surrounding rock downcomer of any one of claims 1-3, wherein: the tail end of the pipe body (1) is conical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910125026.1A CN109667620B (en) | 2019-02-18 | 2019-02-18 | Tunnel surrounding rock wash-out pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910125026.1A CN109667620B (en) | 2019-02-18 | 2019-02-18 | Tunnel surrounding rock wash-out pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109667620A CN109667620A (en) | 2019-04-23 |
| CN109667620B true CN109667620B (en) | 2021-01-29 |
Family
ID=66151759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910125026.1A Active CN109667620B (en) | 2019-02-18 | 2019-02-18 | Tunnel surrounding rock wash-out pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109667620B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113718808A (en) * | 2021-07-23 | 2021-11-30 | 新城控股集团实业发展有限公司 | Precipitation structure for preventing underground structure from floating and construction method thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63308115A (en) * | 1987-06-08 | 1988-12-15 | Kumagai Naoki | Drain pipe and execution thereof |
| SU1666775A1 (en) * | 1989-03-31 | 1991-07-30 | В.Ф.Илюшин | Draining device of water engineering turnnel |
| CN204082211U (en) * | 2014-09-26 | 2015-01-07 | 廖勇 | Dewatering installation and tunnel drainage system |
| CN205975837U (en) * | 2016-08-30 | 2017-02-22 | 安徽金洁塑业有限公司 | Strenghthened type spiral pipe |
| CN206487508U (en) * | 2017-02-27 | 2017-09-12 | 湖南科技大学 | A kind of draining steel pipe device for rich water class earth tunnel face |
| CN207776071U (en) * | 2018-01-17 | 2018-08-28 | 张建刚 | A kind of permeable drainage arrangement in gardens |
-
2019
- 2019-02-18 CN CN201910125026.1A patent/CN109667620B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109667620A (en) | 2019-04-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2001152459A (en) | Slope stabilizing construction method | |
| CN105909257A (en) | Separated grouting device in drilled hole and sectional grouting operation process | |
| CN104895072B (en) | A kind of prestress anchorage cable and prestress anchorage cable one-pass molding construction method | |
| CN109667620B (en) | Tunnel surrounding rock wash-out pipe | |
| CN106437522A (en) | Deep-level and high-ground-stress coal uncovering and drilling construction device and method | |
| US6183166B1 (en) | Method of centrifugally forming a subterranean soil-cement casing | |
| CN108386217B (en) | A kind of the automatic classification expansion head Pulling-Resistant Anchor Rod and its application method of reinforcing soft rock mass | |
| CN109026143A (en) | A kind of interim concentration ejectment device and its application method for lithologic character stratum Tunnel Gushing | |
| CN104763367B (en) | Drifting and pipe scraping integrated tool | |
| CN101307694A (en) | Self-drilling rock anchor | |
| CN103089170A (en) | Extensible drill pipe of long spiral drilling pressure filling pile machine and construction method thereof | |
| CN105178324B (en) | Construction device for umbrella tray type special-shaped pile | |
| CN205604242U (en) | Be applied to self -drilling stock of personally experiencing sth. part of body that expands of weak soil | |
| KR102076246B1 (en) | Anchor hole boring method to emit the crushed slime and the injected water by forming the negative pressure on the slope of the cone-shaped bit | |
| CN108843385B (en) | Method and device for efficiently exploring and draining water in mining mudstone watery roof roadway | |
| CN102308058B (en) | Expandable casing with enhanced collapse resistance and sealing capabilit | |
| KR101213083B1 (en) | The Highest Rod Structure for Providing Water and Air Seperated | |
| CN112963157B (en) | Double-hole tunnel construction method | |
| CN203285349U (en) | Long auger drilling pressing grouting pile machine telescopic drilling rod | |
| US2550408A (en) | Method and device for making waterhandling installations and installations made according to this method | |
| CN212104063U (en) | Grouting type double-anchor-head anchor rod | |
| CN208486912U (en) | A kind of interim concentration ejectment device for lithologic character stratum Tunnel Gushing | |
| CN212104106U (en) | A vibration drainage stock supporting construction for sand type soil layer | |
| CN113503171A (en) | Guiding self-drilling type pipe shed steel pipe device for tunnel excavation and construction method | |
| JP4396433B2 (en) | Advanced arch pipe roof construction method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |