CN215369939U - Railway double-track tunnel basement decompression drainage system - Google Patents
Railway double-track tunnel basement decompression drainage system Download PDFInfo
- Publication number
- CN215369939U CN215369939U CN202120780607.1U CN202120780607U CN215369939U CN 215369939 U CN215369939 U CN 215369939U CN 202120780607 U CN202120780607 U CN 202120780607U CN 215369939 U CN215369939 U CN 215369939U
- Authority
- CN
- China
- Prior art keywords
- drainage
- tunnel
- ditch
- longitudinal
- decompression
- 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
Images
Landscapes
- Lining And Supports For Tunnels (AREA)
Abstract
The utility model relates to a railway double-track tunnel basement decompression drainage system, which comprises a tunnel transverse and longitudinal drainage system, wherein the tunnel transverse drainage system comprises drainage side ditches arranged at two sides of a tunnel and a plurality of transverse drainage blind pipes, and the transverse drainage blind pipes are respectively connected with the drainage side ditches at two sides; the tunnel longitudinal drainage system comprises a central drainage ditch arranged below a tunnel central line pavement, a longitudinal drainage blind ditch is arranged on the outer side of an inverted arch substrate of the tunnel under the central drainage ditch, longitudinal drainage blind pipes are arranged in the longitudinal drainage blind ditch, pressure reducing wells are arranged on two sides of the longitudinal drainage blind ditch in a staggered mode, and the pressure reducing wells are connected with the longitudinal drainage blind pipes and the central drainage ditch respectively. According to the railway double-track tunnel substrate pressure-reducing drainage system, the transverse and longitudinal independent drainage systems are respectively arranged, so that the drainage capacity of the bottom of the tunnel can be effectively improved, and the problems of floating deformation or structural cracking damage of the inverted arch of the tunnel under the action of high water pressure are avoided to the greatest extent.
Description
Technical Field
The utility model relates to the field of tunnel water prevention and drainage, in particular to a railway double-track tunnel substrate pressure reduction and drainage system which can effectively reduce the underground water pressure of a tunnel substrate and avoid the deformation of an inverted arch.
Background
The water prevention and drainage technology of the tunnel is always an important link in the design and construction process of the tunnel. At present, a water prevention and drainage system which is mainly blocked and is used for discharging in limited quantity is generally adopted for a high-pressure water-rich tunnel. The blocking is to reduce the groundwater seeped out of the surrounding rock by various engineering technical means and control the water flow; the drainage is that the quantitative seeped underground water is drained out of the tunnel by arranging drainage systems such as drainage blind pipes, so that the total water seepage amount of surrounding rocks is reduced, and the water pressure acting on the tunnel lining is also reduced. However, the conventional tunnel waterproof and drainage system only arranges a waterproof layer and a drainage blind pipe in the range of the tunnel rear arch wall, and has limited underground water drainage capacity at the tunnel arch base. Particularly, for railway tunnels constructed in high-pressure and water-rich areas, the foundation structure of the tunnel is raised and cracked under the action of underground water pressure, so that the operation safety of railways is seriously damaged. A large number of examples are available in railway tunnels established in China, and the situation is likely to increase, so that diseases have to be remedied at great cost in the later period.
Regarding the problem of damage to the inverted arch caused by high water pressure at the base of the tunnel, the fundamental reason is that the conventional waterproof and drainage system cannot drain the underground water accumulated at the bottom of the tunnel, resulting in the rise of water pressure at the bottom of the tunnel. Therefore, a further improvement is needed on the basis of the existing tunnel water-drainage-preventing system, so that water drainage and pressure relief can be performed on water leakage at the back of the lining arch wall, underground water gathered at the bottom of the tunnel can be fully discharged, and the problem of inverted arch damage caused by high water pressure at the bottom of the tunnel is solved.
Disclosure of Invention
Based on the defect that the underground water drainage capacity at the inverted arch base of the tunnel is limited in the existing tunnel water drainage preventing system, the utility model provides a railway double-track tunnel base pressure reduction drainage system which effectively reduces the underground water pressure at the inverted arch of the tunnel by arranging a longitudinal drainage system and a transverse drainage system at the tunnel base.
The technical scheme adopted by the utility model for solving the technical problems is as follows: a railway double-track tunnel basement decompression drainage system comprises a tunnel transverse drainage system and a tunnel longitudinal drainage system; wherein:
the tunnel transverse drainage system comprises drainage side ditches arranged on two sides of a tunnel pavement and a plurality of transverse drainage blind pipes, wherein the plurality of transverse drainage blind pipes are respectively arranged at the bottom of an inverted arch of the tunnel and are longitudinally arranged along the bottom of the tunnel at intervals; the horizontal drainage blind pipes are respectively connected with the drainage side ditches at the two sides;
the tunnel vertical drainage system comprises a central drainage ditch arranged below a tunnel central line road surface, a vertical drainage blind ditch is arranged on the outer side of a tunnel invert substrate under the central drainage ditch along the vertical length of the tunnel, vertical drainage blind pipes are arranged in the vertical drainage blind ditch, pressure reducing wells are arranged on two sides of the vertical drainage blind ditch in a staggered mode, and the pressure reducing wells are connected with the vertical drainage blind pipes and the central drainage ditch respectively.
Preferably, a plurality of side wall drain pipes which can extend to the outside of the tunnel are respectively arranged on the two side drainage side ditches, and the side wall drain pipes are arranged at the arch feet of the tunnel at intervals along the longitudinal direction of the tunnel.
Preferably, the longitudinal drainage blind ditch is filled with a graded crushed stone layer, and the longitudinal drainage blind pipe is arranged in the graded crushed stone layer.
Furthermore, a plurality of water drainage holes are formed in the longitudinal drainage blind pipe, and a plurality of drainage branch pipes used for connecting the relief well are arranged on the longitudinal drainage blind pipe.
Furthermore, the longitudinal drainage blind pipe arranged in the longitudinal drainage blind ditch is formed by arranging a plurality of drainage blind pipes in sections, each drainage blind pipe is provided with a plurality of drainage holes, and the drainage blind pipes are respectively connected with the relief well.
Furthermore, backfill graded broken stones in the decompression well as a water filtering layer, wherein each decompression well is connected with the central drainage ditch through a vertically arranged drainage guide pipe, the bottom end of the drainage guide pipe is embedded in the decompression well and wrapped with permeable geotextile, and the top end of the drainage guide pipe is connected into the central drainage ditch through the side wall of the central drainage ditch.
Preferably, the drainage guide pipe is of an inverted L-shaped structure, and a water inlet hole is formed in the pipe wall of the part, extending into the relief well, of the drainage guide pipe.
Further, the section of the relief well is rectangular, the length of the rectangular section is 50-80cm, the width of the rectangular section is 50-80cm, and the longitudinal interval of the relief well on the same side of the longitudinal drainage blind ditch is 10-30 cm; the section of the longitudinal drainage blind ditch is trapezoidal, the height of the trapezoidal section is 20-30cm, the width of the upper bottom is 30-40cm, and the width of the lower bottom is 20-25 cm.
Compared with the prior art, the utility model has the following advantages and effects:
1. the railway double-track tunnel basement decompression drainage system can effectively improve the drainage capacity of the bottom of the tunnel by respectively arranging the transverse drainage system and the longitudinal drainage system, and when the water pressure at the bottom of the tunnel is higher, underground water can be drained out of the tunnel through the transverse drainage blind pipe or can be directly gathered into the longitudinal drainage blind ditch for drainage; when the water yield exceeds the drainage capacity of the longitudinal drainage blind ditch of the tunnel base, the relief wells distributed on two sides can be converged into the central drainage ditch through the drainage guide pipes to be discharged, so that the problem that the tunnel inverted arch floats and deforms or the tunnel base structure cracks and breaks under the action of high water pressure is avoided to the maximum extent.
2. The railway double-track tunnel substrate decompression drainage system overcomes the defect that the existing tunnel substrate drainage system is not smooth in local drainage, so that accumulated water on the tunnel substrate can be effectively drained; meanwhile, the transverse drainage system and the longitudinal drainage system are arranged independently, and water flow can be discharged through other paths even if local blockage occurs, so that the whole drainage capacity and reliability of the tunnel are greatly improved.
3. In the railway double-track tunnel basement decompression drainage system, the decompression wells are arranged at intervals, so that the working state of the tunnel basement drainage system can be checked and blockage can be cleared; meanwhile, the number of the relief wells can be reasonably arranged according to the water-rich condition of the stratum, so that the design is more reasonable and effective, the engineering quantity is reduced, and the construction period is shortened.
5. In the railway double-track tunnel basement decompression drainage system, a plurality of side wall drain pipes are arranged at tunnel arch feet and connected with drainage side ditches, drainage passages of underground water outside the tunnel are increased, leakage water behind a tunnel lining can be prevented from flowing into the tunnel bottom, and accumulated water at the tunnel arch walls can be timely drained when the tunnel arch wall drainage system is blocked and fails, so that a tunnel basement structure is always ensured not to bear overhigh water pressure.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a sectional view of a partial structure of a railway double-track tunnel basement decompression drainage system according to an embodiment of the utility model.
FIG. 2 is a plan view of a relief well according to an embodiment of the present invention.
FIG. 3 is a schematic sectional view showing the relief well according to the embodiment of the present invention.
Fig. 4 is a schematic cross-sectional structure view of the longitudinal drainage blind ditch according to the embodiment of the utility model.
Fig. 5 is a schematic structural view of a longitudinal drainage blind pipe according to an embodiment of the utility model.
Fig. 6 is a schematic structural view of a drain conduit according to an embodiment of the present invention.
Description of reference numerals: 1. a central drain ditch; 2. a drainage side ditch; 3. a horizontal drainage blind pipe; 4. longitudinal drainage blind ditches; 5. a relief well; 6. a drain conduit; 7. side wall drain pipes; 8. grading a crushed stone layer; 9. a longitudinal drainage blind pipe; 10. a water inlet hole.
Detailed Description
The present invention will be described in further detail with reference to examples, which are illustrative of the present invention and are not to be construed as being limited thereto.
Example 1: as shown in fig. 1, a railway double-track tunnel basement decompression drainage system comprises a tunnel transverse drainage system and a tunnel longitudinal drainage system; wherein:
the tunnel transverse drainage system comprises drainage side ditches 2 arranged on two sides of a tunnel pavement and a plurality of transverse drainage blind pipes 3, wherein the plurality of transverse drainage blind pipes 3 are respectively arranged at the bottom of an inverted arch of the tunnel and are longitudinally arranged at intervals along the bottom of the tunnel; the two side ends of the transverse drainage blind pipe 3 are respectively connected into the corresponding drainage side ditch 2 through bent pipes;
the tunnel vertical drainage system comprises a central drainage ditch 1 arranged below a tunnel central line road surface, a vertical drainage blind ditch 4 is arranged on the outer side of a tunnel inverted arch substrate under the central drainage ditch 1 along the vertical through length of the tunnel, a graded gravel layer 8 is filled in the vertical drainage blind ditch 4, a vertical drainage blind pipe 9 is arranged in the graded gravel layer 8, decompression wells 5 are arranged on two sides of the vertical drainage blind ditch in a staggered mode, and the decompression wells 5 are respectively connected with the vertical drainage blind pipe 9 and the central drainage ditch 1.
In this embodiment 1, a plurality of drainage holes are formed in the longitudinal drainage blind pipe 9, and a plurality of drainage branch pipes for connecting the relief well 5 are formed in the longitudinal drainage blind pipe 9; the backfilling graded crushed stone layer 8 in the relief well 5 is used as a water filtering layer, each relief well 5 is connected with the central drainage ditch 1 through a vertically arranged drainage guide pipe 6, the bottom end of each drainage guide pipe 6 is embedded into the relief well 5 and wrapped with permeable geotextile, and the top end of each drainage guide pipe 6 is connected into the central drainage ditch through the side wall of the central drainage ditch 1.
Specifically, the drain pipe 6 has an inverted L-shape as shown in fig. 6. The drainage guide pipe 6 is a phi 108 hot-rolled seamless steel pipe, the tail of the steel pipe extends into the pressure reducing well 5 by not less than 40cm, a phi 10-16 mm water inlet hole 10 is formed in the pipe wall of the part extending into the pressure reducing well 5, and the water outlet of the bent pipe part is 60cm higher than the bottom of the central drainage ditch 1.
Example 2: as shown in fig. 1, a pressure reducing and draining system for the base of a railway double-track tunnel is different from that of embodiment 1 in that a plurality of side wall drain pipes 7 which can extend to the outside of the tunnel are respectively arranged on the two side drain side ditches 2.
In this embodiment 2, the side wall water drain pipes 7 are arranged at the arch springing of the tunnel at intervals along the longitudinal direction of the tunnel, one end of each side wall water drain pipe 7 extends into the drainage side ditch 2, and the other end of each side wall water drain pipe extends into the surrounding rock of the tunnel and extends to the outside of the tunnel.
Example 3: as shown in fig. 1 and 5, the railway double-track tunnel basement decompression drainage system is different from the embodiment 1 and the embodiment 2 in that a longitudinal drainage blind pipe 9 arranged in a longitudinal drainage blind ditch 4 is formed by arranging a plurality of drainage blind pipes in sections (as shown in fig. 5), each drainage blind pipe is provided with a plurality of drainage holes, and the drainage blind pipes are respectively connected with a decompression well 5.
Further, as shown in fig. 3, in the railway double-track tunnel basement decompression drainage system of the embodiment 1 to 3, the section of the decompression well 5 is rectangular, the length of the rectangular section is 50-80cm, and the width of the rectangular section is 50-80 cm; the longitudinal interval of the relief wells 5 on the same side of the longitudinal drainage blind ditch 4 is 10-30 cm; as shown in figure 4, the section of the longitudinal drainage blind ditch 4 is trapezoidal, the height of the trapezoidal section is 20-30cm, the width of the upper bottom is 30-40cm, and the width of the lower bottom is 20-25 cm.
Example 4: as shown in fig. 1 to 6, a pressure reduction and drainage system for a railway double-track tunnel foundation according to a construction embodiment 3 specifically includes the following steps:
(1) after the tunnel inverted arch is excavated, a small excavator is used for downwards grooving along the position of a central drainage ditch 1, a longitudinal groove as shown in figure 4 is excavated to serve as a longitudinal drainage blind ditch 4 of a tunnel base, a graded crushed stone layer 8 is backfilled in the longitudinal drainage blind ditch 4 to serve as a water seepage layer, a longitudinal drainage blind pipe 9 formed by arranging a plurality of drainage blind pipes is embedded in the water seepage layer, and the drainage blind pipe 9 is a PVC pipe with a phi 100 hole;
(2) synchronously excavating a rectangular section relief well 5 which is shown in figure 3 at the right and left sides of the tunnel substrate and is deviated from the lower part of the central drainage ditch 1 of the tunnel center line at a proper distance, wherein the plan layout of the relief well 5 is shown in figure 2, graded crushed stone layers 8 are filled in the relief well 5 to be used as a water filtering layer, and drainage blind pipes in the longitudinal drainage blind ditches 4 are connected into the relief well 5 in a segmented manner as shown in figure 5;
(3) connecting the relief well 5 with the tunnel central drainage ditch 1 through a drainage conduit 6, wherein the drainage conduit 6 is used for introducing pressure-bearing water in a longitudinal drainage blind pipe 9 into the central drainage ditch 1;
(4) before the inverted arch structure is poured, arranging a plurality of transverse drainage blind pipes 3 arranged at intervals in the longitudinal direction on a tunnel base to collect base water, wherein the transverse drainage blind pipes 3 adopt phi 50 perforated corrugated pipes and are directly bent into drainage side ditches 2 on two sides, the longitudinal distance is 3-6 m, and reserved pipe orifices are 35cm higher than the bottoms of the drainage side ditches 2; before the inverted arch concrete is poured, fixing the position by adopting color strip cloth with the width of 50cm and covering the transverse drainage blind pipe 3 of the substrate;
(5) the side wall drain pipe 7 is composed of two parts: in the stage I engineering, phi 110PVC pipes are reserved before constructing an inverted arch and a low-profile wall, the pipe openings are 10cm higher than the bottom of a side ditch, the gradient is 10%, and the longitudinal distance is 2 m; and in the stage II engineering, after the inverted arch is finished, dredging crystals by adopting an impact drill bit (phi 76mm/420mm specification) and drilling holes to the surrounding rock within 0.5m before pouring the side groove vertical mold.
Based on the construction method, the pressure-reducing drainage system disclosed by the embodiments 1 to 3 of the utility model can successfully collect underground water, and simultaneously can smoothly discharge the underground water of the tunnel base to the central drainage ditch along the longitudinal direction of the tunnel and to the drainage side ditches at the two sides of the tunnel along the transverse direction of the tunnel, so that the water pressure of the tunnel base is reduced, the inverted arch is effectively prevented from bulging and deforming, and the engineering hidden danger in the later operation process of the railway is reduced. The pressure reduction drainage system is simple to apply, obvious in effect, capable of ensuring various factors such as safety, quality, construction period and benefit and improving the tunnel construction level by one step, strong in pertinence and extremely high in popularization and application value.
In addition, it should be noted that the specific embodiments described in the present specification may differ in the shape of the components, the names of the components, and the like. All equivalent or simple changes of the structure, the characteristics and the principle of the utility model which are described in the patent conception of the utility model are included in the protection scope of the patent of the utility model. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the utility model as defined in the accompanying claims.
Claims (8)
1. A railway double-track tunnel basement decompression drainage system is characterized by comprising a tunnel transverse drainage system and a tunnel longitudinal drainage system; wherein:
the tunnel transverse drainage system comprises drainage side ditches arranged on two sides of a tunnel pavement and a plurality of transverse drainage blind pipes, wherein the plurality of transverse drainage blind pipes are respectively arranged at the bottom of an inverted arch of the tunnel and are longitudinally arranged along the bottom of the tunnel at intervals; the horizontal drainage blind pipes are respectively connected with the drainage side ditches at the two sides;
the tunnel vertical drainage system comprises a central drainage ditch arranged below a tunnel central line road surface, a vertical drainage blind ditch is arranged on the outer side of a tunnel invert substrate under the central drainage ditch along the vertical length of the tunnel, vertical drainage blind pipes are arranged in the vertical drainage blind ditch, pressure reducing wells are arranged on two sides of the vertical drainage blind ditch in a staggered mode, and the pressure reducing wells are connected with the vertical drainage blind pipes and the central drainage ditch respectively.
2. The railway double-track tunnel basement decompression drainage system of claim 1, wherein, a plurality of side wall drain pipes which can extend to the outside of the tunnel are respectively arranged on the two side drainage side ditches, and the side wall drain pipes are arranged at the arch feet of the tunnel at intervals along the longitudinal direction of the tunnel.
3. The railway double-track tunnel basement decompression drainage system of claim 2, characterized in that the longitudinal drainage blind ditches are filled with graded gravel layers, and the longitudinal drainage blind pipes are arranged in the graded gravel layers.
4. The railway double-track tunnel basement decompression drainage system of claim 3, wherein a plurality of drainage holes are arranged on the longitudinal drainage blind pipe, and a plurality of drainage branch pipes for connecting the decompression wells are arranged on the longitudinal drainage blind pipe.
5. The railway double-track tunnel basement decompression drainage system of claim 3, characterized in that the longitudinal drainage blind pipes arranged in the longitudinal drainage blind ditches are formed by arranging a plurality of drainage blind pipes in sections, each drainage blind pipe is provided with a plurality of drainage holes, and the drainage blind pipes are respectively connected with the decompression well.
6. The railway double-track tunnel basement decompression drainage system of claim 3 or 4, characterized in that, backfill graded broken stones in the decompression well are used as water filtering layers, each decompression well is connected with the central drainage ditch through a vertically arranged drainage conduit, the bottom end of the drainage conduit is buried in the decompression well and wrapped with permeable geotextile, and the top end of the drainage conduit is connected into the central drainage ditch through the side wall of the central drainage ditch.
7. The railway double-track tunnel basement decompression drainage system of claim 6, characterized in that, the drainage pipe is of an inverted L-shaped structure, and the part of the pipe wall of the drainage pipe extending into the decompression well is provided with a water inlet hole.
8. The railway double-track tunnel basement decompression drainage system of claim 6, wherein the section of the decompression well is rectangular, the length of the rectangular section is 50-80cm, the width of the rectangular section is 50-80cm, and the longitudinal interval of the decompression well on the same side of the longitudinal drainage blind ditch is 10-30 cm; the section of the longitudinal drainage blind ditch is trapezoidal, the height of the trapezoidal section is 20-30cm, the width of the upper bottom is 30-40cm, and the width of the lower bottom is 20-25 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120780607.1U CN215369939U (en) | 2021-04-16 | 2021-04-16 | Railway double-track tunnel basement decompression drainage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120780607.1U CN215369939U (en) | 2021-04-16 | 2021-04-16 | Railway double-track tunnel basement decompression drainage system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215369939U true CN215369939U (en) | 2021-12-31 |
Family
ID=79627123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120780607.1U Active CN215369939U (en) | 2021-04-16 | 2021-04-16 | Railway double-track tunnel basement decompression drainage system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215369939U (en) |
-
2021
- 2021-04-16 CN CN202120780607.1U patent/CN215369939U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105863671B (en) | Frame-type subdrain system tunnel lining structure | |
| CN105927272B (en) | Bottom plate anchors restricted type tunnel lining structure | |
| CN105840210A (en) | Box type tunnel-bottom composite arched tunnel lining structure with water drain function | |
| CN107905811B (en) | Inverted arch-free lining of foundation hollow longitudinal beam bearing arch structure | |
| CN208310794U (en) | The tunnel-liner of haunch floor type and the drainage system of leaked oil is arranged in tunnel bottom | |
| CN103032097A (en) | Tunnel drainage structure applicable to water-rich strata under unsymmetrical pressure and construction method thereof | |
| CN111021408A (en) | Construction method of water-stopping support system in pipe gallery river reach operation | |
| CN108222963A (en) | The not contour longeron carrying stalk floor type lining cutting of tunnel bottom setting longitudinal direction collection drainage gallery and its drainage system construction | |
| KR100877452B1 (en) | Construction method of middle wall of three arch excavation tunnel | |
| CN107964971B (en) | A kind of precipitation method of the subway station using the construction of PBA engineering method | |
| CN203050779U (en) | Tunnel drainage structure suitable for bias pressure rich water strata | |
| CN215369939U (en) | Railway double-track tunnel basement decompression drainage system | |
| CN108086993B (en) | Construction method of haunched floor type tunnel lining and drainage system structure with drainage gallery arranged at tunnel bottom | |
| CN111271118A (en) | Drainage structure suitable for reconstruction of tunnel bottom structure of karst tunnel and construction method thereof | |
| CN215804714U (en) | Drainage depressurization system at bottom of rich water section tunnel | |
| CN108005677B (en) | Frame type integral tunnel bottom arch lining and drainage system thereof | |
| CN216305942U (en) | Protection system for tunnel passing through debris flow channel downwards | |
| CN112854268B (en) | Construction method for jacking and dewatering frame bridge in karst area and geological exploration and treatment method | |
| CN212247676U (en) | Structure is rebuild to existing railway roadbed underground drainage system | |
| CN211950587U (en) | Drainage structure suitable for reconstruction of tunnel bottom structure of karst tunnel | |
| CN107905812A (en) | The hollow compound arch tunnel-liner in type tunnel bottom and its drainage system construction of falling from power | |
| CN107975378A (en) | The U-shaped wall base with architecture separates bearing type liner structure with bottom plate sound | |
| CN108005688A (en) | The external dewatering type lining cutting of buried lateral sulcus and its drainage system | |
| CN207829902U (en) | The U-shaped wall base with architecture detaches bearing type liner structure with bottom plate sound | |
| CN117418895B (en) | Semi-assembled open cut tunnel water-proof and drainage system and construction method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |