CN209780957U - Water-rich railway tunnel bottom sluicing decompression and reinforced structure - Google Patents
Water-rich railway tunnel bottom sluicing decompression and reinforced structure Download PDFInfo
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- CN209780957U CN209780957U CN201920319422.3U CN201920319422U CN209780957U CN 209780957 U CN209780957 U CN 209780957U CN 201920319422 U CN201920319422 U CN 201920319422U CN 209780957 U CN209780957 U CN 209780957U
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Abstract
The utility model discloses a water-rich railway tunnel bottom sluicing decompression and reinforcement structure, which mainly comprises an orifice pipe (1), a drain pipe (2), a water collecting pipe (3), a permeable blind pipe (4) and a reinforcement anchor rod (5), wherein the water inlet end of the drain pipe (2) is connected with the water collecting pipe (3), and the water collecting pipe (3) is sleeved in the permeable blind pipe (4); the water outlet end of the drain pipe (2) is connected with the orifice pipe (1), and the water outlet end of the orifice pipe (1) extends into the drain ditch (6); the reinforcing anchor rods (5) are sequentially punched from top to bottom, penetrate through the inverted arch filling layer (9) and the inverted arch lining structure (10) and are embedded into the bottom bedrock post-pouring layer to be connected into a whole. The utility model has simple design structure and strong operability, not only realizes active drainage and pressure relief, but also reduces the cracking risk of the inverted arch; and the tunnel inverted arch part is reinforced by utilizing the reinforcing anchor rod, so that the overall stability of the tunnel structure is enhanced, and the tunnel operation safety is fully guaranteed.
Description
Technical Field
the utility model relates to a tunnel engineering field specifically is a rich water railway tunnel bottom sluices and steps down and reinforced structure.
Background
With the rapid development of railway traffic engineering in China, tunnel engineering under special geological environment conditions is increasing. The southwest area is one of the areas with most frequent geological disasters such as the active structure, earthquake, large (huge) landslide, collapse, debris flow and the like in China, and the variety of unfavorable geology is various. For example, rock salt, gypsum, limestone, dolomite and other soluble rock strata are widely distributed in southwest regions, and railway trunks under construction are involved in different degrees, so that the design of tunnel engineering is complex; during railway operation, the inverted arch of the tunnel in the water-rich section is easy to crack, seep water and generate mud-pumping due to the long-term action of underground confined water, and the stability of the tunnel supporting structure and the railway operation safety are seriously affected. In order to effectively solve the engineering problem, a water-rich railway tunnel bottom drainage pressure reduction and reinforcement structure is provided.
Therefore, the key point for solving the technical problems is to develop a water-rich railway tunnel bottom drainage pressure reduction and reinforcement structure with strong practicability and higher working reliability.
Disclosure of Invention
Aiming at the engineering problem that the bottom of an inverted arch of a railway tunnel in a water-rich section is easy to crack and seep water under the action of water pressure, a water drainage and drainage device is applied to a side ditch of the tunnel in the water-rich section to realize active drainage and pressure relief, so that the cracking risk of the inverted arch is reduced; meanwhile, the anchor rod is utilized to reinforce the inverted arch part of the tunnel, so that the overall stability of the tunnel structure is enhanced, and the operation safety of the tunnel is fully guaranteed.
In order to achieve the above purpose, the present invention is realized by the following technical solution:
A water-rich railway tunnel bottom water drainage pressure reduction and reinforcement structure mainly comprises an orifice pipe (1), a water drainage pipe (2), a water collection pipe (3), a water permeable blind pipe (4) and a reinforcement anchor rod (5), wherein the water inlet end of the water drainage pipe (2) is connected with the water collection pipe (3), and the water collection pipe (3) is sleeved in the water permeable blind pipe (4); the water outlet end of the drain pipe (2) is connected with the orifice pipe (1), and the water outlet end of the orifice pipe (1) extends into the drain ditch (6); the reinforcing anchor rods (5) are sequentially punched from top to bottom, penetrate through the inverted arch filling layer (9) and the inverted arch lining structure (10) and are embedded into the bottom bedrock post-pouring layer to be connected into a whole.
As another preferable technical solution of the present invention, the distance between the top end of the orifice pipe (1) and the side trench cover plate is not less than 30cm, and the overlapping length of the bottom end of the orifice pipe (1) and the drain pipe (2) is 10 cm; the water outlet of the orifice pipe is higher so as to prevent the side ditch from draining water and flowing backwards and seeping to the bottom of the tunnel.
As the above-mentioned preferred technical scheme of the utility model, orifice pipe (1) is the PVC pipe that the diameter is 30mm, length is 80 cm.
As the preferable technical scheme of the utility model, the drain pipe (2) is arranged to penetrate through the inverted arch filling layer (9) and the inverted arch lining structure (10); the outer side of the drain pipe (2) is annularly wrapped with non-woven fabrics matched with the drain pipe to complete the work.
as the above-mentioned further preferred technical solution of the present invention, the drain pipe (2) is a PVC pipe with a diameter of 40mm and a length of 70 cm; the top end and the bottom end of the drain pipe (2) are respectively lapped with the orifice pipe (1) and the water collecting pipe (3) by 10 cm.
As the above-mentioned preferred technical scheme of the utility model of further step, collector pipe (3) top is located two lining structure lower parts of inverted arch, and corresponding supporting setting of upper portion orifice pipe (1) and drain pipe (2).
as a still further preferable technical solution of the present invention, the water collecting pipe (3) is a perforated steel flower pipe with a diameter of 50mm and a length of 100 cm; the water collecting pipe (3) is in lap joint with the water discharging pipe (2) by 10 cm; and the longitudinal arrangement distance of the water collecting pipes (3) is 1 m.
As the above-mentioned still further preferred technical solution of the present invention, the water permeable blind pipe (4) is a hard water permeable blind pipe with a diameter of 60mm, and the water permeable blind pipe (4) is arranged outside the water collecting pipe (3) and has a uniform length; and the bottom of the water permeable blind pipe (4) is closed so as to prevent silt from entering and blocking the drainage channel.
As the utility model discloses foretell still further preferred technical scheme again, consolidate stock (5) and be cavity slip casting stock, the head end of consolidating stock (5) is the toper structure, sets up several grout outlet (5a) that link up the inside and outside wall on consolidating stock (5), and the outer wall that consolidates stock (5) is still symmetrical or asymmetric and is equipped with several angle steel barb (5b), and angle steel barb (5b) are used for increasing the anchor with ground around.
As a still further preferable technical solution of the present invention, the reinforcing anchor rod (5) is a hollow grouting anchor rod with a diameter of 25mm, and the total number of the hollow grouting anchor rods is distributed in a plurality according to actual construction needs; the length of the reinforced anchor rod (5) is embedded into the bottom bedrock to be not less than 1 m; the distance between the adjacent slurry outlet holes (5a) is 200 mm.
The working principle is as follows: the drainage and pressure reduction and reinforcement structure for the bottom of the water-rich railway tunnel with the design structure needs to be manufactured and installed for standby before being used.
When in manufacturing and installation, the water drainage, pressure reduction and reinforcement structure at the bottom of the water-rich railway tunnel mainly comprises an orifice pipe (1), a drain pipe (2), a water collecting pipe (3), a water permeable blind pipe (4) and a reinforcement anchor rod (5), wherein,
The orifice pipe (1) is a phi 30mm PVC pipe with the length of 80 cm; the distance between the top end of the orifice pipe and the side ditch cover plate is not less than 30cm, and the lap joint length between the bottom end of the orifice pipe and the drain pipe (2) is 10 cm; the water outlet of the orifice pipe is higher, so that the side ditch drainage backflow downward seepage to the bottom of the tunnel can be effectively avoided; the drain pipe (2) is a PVC pipe with the diameter of 40mm, the length of the pipe is 70cm, and the pipe penetrates through the inverted arch filling layer and the inverted arch lining structure section; the outer side of the drain pipe is wrapped with non-woven fabrics (filament type, the weight is more than or equal to 350g/m, the thickness is more than or equal to 3mm, and the permeability coefficient is more than or equal to 5 multiplied by 10 < -2 >); the top end and the bottom end of the drain pipe are respectively lapped with the orifice pipe (1) and the water collecting pipe (3) by 10 cm; the water collecting pipe (3) is a perforated steel flower pipe with the diameter of 50mm, the length of the water collecting pipe is 100cm, and the water collecting pipe is arranged inside the water permeable blind pipe (4); the top end of the water collecting pipe is positioned at the lower part of the inverted arch secondary lining structure and is lapped with the drain pipe (2) by 10 cm; the longitudinal arrangement distance of the water collecting pipes is 1m, the upper orifice pipe and the drain pipe are correspondingly matched, and the water permeable blind pipe (4) is a phi 60mm hard water permeable blind pipe which is arranged on the outer side of the water collecting pipe (3) and has consistent length; the bottom of the permeable blind pipe is closed so as to prevent silt from entering and blocking the drainage channel; the reinforcing anchor rod (5) adopts a phi 25mm hollow grouting anchor rod, and the inverted arch, the inverted arch filling and the inverted arch filling post-pouring layer are connected into a whole; the length of the anchor rods is embedded into the bottom bedrock and is not less than 1m, and the longitudinal distance between the anchor rods is 1 m; the strength of the anchor rod mortar is not lower than M20, and all anchor rods must be provided with steel backing plates, steel plates and bolts, and the size is not less than 150mm multiplied by 6 mm; the anchoring anchor rod and the grouting hole are arranged in a staggered mode.
And after the device is manufactured according to the construction operation, construction can be carried out according to the standard construction operation requirement.
Firstly, carrying out construction of a water drainage pressure reducing pipe, negotiating with a railway management department before construction, and selecting dry seasons for construction after agreement is obtained, wherein the requirements of the railway department are strictly executed in the construction process, and the operation safety and the construction safety of a train are noticed; secondly, drilling holes in the center of the side ditch along the longitudinal direction of the tunnel according to the designed interval, and embedding a water permeable blind pipe, a water collecting pipe, a water discharging pipe and an orifice pipe in sequence, wherein the periphery of the water discharging pipe is wrapped by non-woven fabrics, and the mutual lap joint and fastening process is completed according to requirements.
And then reinforcing the anchor rod, negotiating with a railway management department before construction, and performing construction during the railway outage period after agreement is obtained, wherein during construction, a constructor firstly needs to dismantle the track bed and the track structure above an inverted arch filling layer of a tunnel section to be reconstructed according to a construction standard, then performs anchor rod drilling construction, grouting construction and anchoring, and after grouting is basically stable, the track bed and the track structure are restored to finish the reinforcement of the whole tunnel and the water drainage and pressure reduction work.
The utility model has the advantages that: the utility model discloses a to building the tunnel engineering of input operation, carry out the initiative in rich water district tunnel side ditch drilling and excrete bottom confined water pipe means, can effectively reduce the invert fracture infiltration and turn over thick liquid mud pumping disease risk, realize initiative drainage pressure release, reduce the invert fracture risk; utilize simultaneously to consolidate the two lining structures of connection invert, invert filling layer and the tunnel bottom country rock of reinforcement stock reinforcement, can effectively improve tunnel structure overall stability. Through the drainage and reinforcement measures, the safety of the tunnel structure and the safety of railway operation are fully guaranteed.
Drawings
The following detailed description of embodiments of the invention is provided with reference to the accompanying drawings, in which:
FIG. 1 is a schematic view of the cross section of the water-rich railway tunnel for water drainage and pressure reduction and reinforcement structure of the present invention;
FIG. 2 is a schematic view of the whole combination structure of the water discharge pipeline at the bottom of the water-rich railway tunnel of the present invention;
fig. 3 is a schematic view of the overall construction of the reinforced anchor member of the present invention;
Wherein, the reference numbers in the figures: 1-orifice tube;
2, a water drainage pipe;
3, a water collecting pipe;
4-water-permeable blind pipe;
5-reinforcing anchor rods, 5 a-grout outlet holes and 5 b-angle steel barbs;
6, a drainage ditch;
7, designing a rail surface;
8-track bed rail surface;
9-an inverted arch filling layer;
10-an inverted arch lining structure;
11-side wall.
Detailed Description
The invention is explained in more detail below with reference to the figures and examples, without limiting the scope of the invention to the details.
The structure for draining, depressurizing and reinforcing the bottom of the water-rich railway tunnel is mainly composed of an orifice pipe 1, a drain pipe 2, a water collecting pipe 3, a water permeable blind pipe 4 and a reinforcing anchor rod 5, wherein the water inlet end of the drain pipe 2 is connected with the water collecting pipe 3, and the water collecting pipe 3 is sleeved in the water permeable blind pipe 4 in a penetrating manner; the water outlet end of the water outlet pipe 2 is connected with the orifice pipe 1, and the water outlet end of the orifice pipe 1 extends into the drainage ditch 6; the reinforcing anchor rods 5 are sequentially punched from top to bottom to penetrate through the inverted arch filling layer 9 and the inverted arch lining structure 10 and are embedded into the bottom bedrock post-cast layer to be connected into a whole.
further, the distance between the top end of the orifice pipe 1 and the side ditch cover plate is not less than 30cm, and the lap joint length of the bottom end of the orifice pipe 1 and the drain pipe 2 is 10 cm; the water outlet of the orifice pipe is higher so as to prevent the side ditch from draining water and flowing backwards and seeping to the bottom of the tunnel.
specifically, the orifice pipe 1 is a PVC pipe having a diameter of 30mm and a length of 80 cm.
furthermore, the drain pipe 2 is arranged through the inverted arch filling layer 9 and the inverted arch lining structure 10; the outer side of the drain pipe 2 is annularly wrapped with non-woven fabrics matched with the drain pipe to complete the work.
Specifically, the drain pipe 2 is a PVC pipe with the diameter of 40mm and the length of 70 cm; the top end and the bottom end of the drain pipe 2 are respectively lapped with the orifice pipe 1 and the water collecting pipe 3 by 10 cm.
Furthermore, the top end of the water collecting pipe 3 is positioned at the lower part of the inverted arch double-lining structure, and the upper orifice pipe 1 and the drain pipe 2 are correspondingly matched.
specifically, the water collecting pipe 3 is a perforated steel flower pipe with the diameter of 50mm and the length of 100 cm; the water collecting pipe 3 is lapped with the water discharging pipe 2 by 10 cm; and the longitudinal arrangement distance of the water collecting pipes 3 is 1 m.
Further, the water permeable blind pipe 4 is a hard water permeable blind pipe with the diameter of 60mm, and the water permeable blind pipe 4 is arranged on the outer side of the water collecting pipe 3 and is consistent in length; and the bottom of the water permeable blind pipe 4 is closed so as to prevent silt from entering and blocking the drainage channel.
Further, consolidate stock 5 and be cavity slip casting stock, the head end of consolidating stock 5 is the toper structure, sets up the play thick liquid hole 5a that the several link up the inside and outside wall on consolidating stock 5, and the outer wall of consolidating stock 5 is still symmetrical or asymmetric and is equipped with several angle steel barb 5b, and angle steel barb 5b is used for increasing the anchor with ground on every side.
Specifically, the reinforcing anchor rods 5 are hollow grouting anchor rods with the diameter of 25mm, and the total number of the hollow grouting anchor rods is distributed into a plurality according to actual construction requirements; the length of the reinforced anchor rod 5 is embedded into the bottom bedrock to be not less than 1 m; the distance between the adjacent slurry outlet holes 5a is 200 mm.
to sum up, the utility model discloses more specific embodiment is:
the drainage and pressure reduction and reinforcement structure for the bottom of the water-rich railway tunnel with the design structure needs to be manufactured and installed for standby before being used.
When in manufacturing and installation, as shown in figures 1 and 2, the water draining, pressure reducing and reinforcing structure at the bottom of the water-rich railway tunnel mainly comprises an orifice pipe 1, a water draining pipe 2, a water collecting pipe 3, a water permeable blind pipe 4 and a reinforcing anchor rod 5, wherein,
The orifice pipe 1 is a phi 30mm PVC pipe with the length of 80 cm; the distance between the top end of the orifice pipe and the side ditch cover plate is not less than 30cm, and the lap joint length between the bottom end of the orifice pipe and the drain pipe 2 is 10 cm; the water outlet of the orifice pipe is higher, so that the side ditch drainage backflow downward seepage to the bottom of the tunnel can be effectively avoided; the drain pipe 2 is a phi 40mm PVC pipe, has the length of 70cm and is arranged by penetrating through the inverted arch filling layer and the inverted arch lining structure section; the outer side of the drain pipe is wrapped with a non-woven fabric filament type, the weight is more than or equal to 350g/m, the thickness is more than or equal to 3mm, and the permeability coefficient is more than or equal to 5 multiplied by 10 < -2 >; the top end and the bottom end of the drain pipe are respectively lapped with the orifice pipe 1 and the water collecting pipe 3 by 10 cm; the water collecting pipe 3 is a perforated steel floral pipe with the diameter of 50mm, the length of the perforated steel floral pipe is 100cm, and the water collecting pipe is arranged inside the water permeable blind pipe 4; the top end of the water collecting pipe is positioned at the lower part of the inverted arch secondary lining structure and is lapped with the drain pipe 2 by 10 cm; the longitudinal arrangement distance of the water collecting pipes is 1m, the upper orifice pipe and the drain pipe are correspondingly matched, and the water permeable blind pipe 4 is a phi 60mm hard water permeable blind pipe which is arranged outside the water collecting pipe 3 and has consistent length; the bottom of the permeable blind pipe is closed so as to prevent silt from entering and blocking the drainage channel; the reinforcing anchor rod 5 adopts a hollow grouting anchor rod with the diameter of 25mm, and the inverted arch, the inverted arch filling and the inverted arch filling post-pouring layer are connected into a whole; the length of the anchor rods is embedded into the bottom bedrock and is not less than 1m, and the longitudinal distance between the anchor rods is 1 m; the strength of the anchor rod mortar is not lower than M20, and all anchor rods must be provided with steel backing plates, steel plates and bolts, and the size is not less than 150mm multiplied by 6 mm; the anchoring anchor rod and the grouting hole are arranged in a staggered mode.
and after the device is manufactured according to the construction operation, construction can be carried out according to the standard construction operation requirement.
Firstly, carrying out construction of a water drainage pressure reducing pipe, negotiating with a railway management department before construction, and selecting dry seasons for construction after agreement is obtained, wherein the requirements of the railway department are strictly executed in the construction process, and the operation safety and the construction safety of a train are noticed; secondly, drilling holes in the center of the side ditch along the longitudinal direction of the tunnel according to the designed interval, and embedding a water permeable blind pipe, a water collecting pipe, a water discharging pipe and an orifice pipe in sequence, wherein the periphery of the water discharging pipe is wrapped by non-woven fabrics, and the mutual lap joint and fastening process is completed according to requirements.
And then reinforcing the anchor rod, negotiating with a railway management department before construction, and performing construction during the railway outage period after agreement is obtained, wherein during construction, a constructor firstly needs to dismantle the track bed and the track structure above an inverted arch filling layer of a tunnel section to be reconstructed according to a construction standard, then performs anchor rod drilling construction, grouting construction and anchoring, and after grouting is basically stable, the track bed and the track structure are restored to finish the reinforcement of the whole tunnel and the water drainage and pressure reduction work.
Claims (10)
1. The utility model provides a rich water railway tunnel bottom sluices and steps down and reinforced structure which characterized in that: the water-permeable blind pipe anchor rod is mainly composed of an orifice pipe (1), a water drain pipe (2), a water collecting pipe (3), a water permeable blind pipe (4) and a reinforcing anchor rod (5), wherein the water inlet end of the water drain pipe (2) is connected with the water collecting pipe (3), and the water collecting pipe (3) is sleeved in the water permeable blind pipe (4) in a penetrating manner; the water outlet end of the drain pipe (2) is connected with the orifice pipe (1), and the water outlet end of the orifice pipe (1) extends into the drain ditch (6); the reinforcing anchor rods (5) are sequentially punched from top to bottom, penetrate through the inverted arch filling layer (9) and the inverted arch lining structure (10) and are embedded into the bottom bedrock post-pouring layer to be connected into a whole.
2. The water-rich railway tunnel bottom draining, pressure reducing and reinforcing structure of claim 1, wherein: the distance between the top end of the orifice pipe (1) and the side ditch cover plate is not less than 30cm, and the lap joint length of the bottom end of the orifice pipe (1) and the drain pipe (2) is 10 cm; the water outlet of the orifice pipe is higher so as to prevent the side ditch from draining water and flowing backwards and seeping to the bottom of the tunnel.
3. The water-rich railway tunnel bottom draining, pressure reducing and reinforcing structure of claim 2, wherein: the orifice pipe (1) is a PVC pipe with the diameter of 30mm and the length of 80 cm.
4. The water-rich railway tunnel bottom draining, pressure reducing and reinforcing structure of claim 1, wherein: the drain pipe (2) penetrates through the inverted arch filling layer (9) and the inverted arch lining structure (10); the outer side of the drain pipe (2) is annularly wrapped with non-woven fabrics matched with the drain pipe to complete the work.
5. The water-rich railway tunnel bottom draining, pressure reducing and reinforcing structure of claim 4, wherein: the drain pipe (2) is a PVC pipe with the diameter of 40mm and the length of 70 cm; the top end and the bottom end of the drain pipe (2) are respectively lapped with the orifice pipe (1) and the water collecting pipe (3) by 10 cm.
6. the water-rich railway tunnel bottom draining, pressure reducing and reinforcing structure of claim 1, wherein: the top end of the water collecting pipe (3) is positioned at the lower part of the inverted arch double-lining structure, and the upper orifice pipe (1) and the drain pipe (2) are correspondingly matched.
7. The water-rich railway tunnel bottom draining, pressure reducing and reinforcing structure of claim 6, wherein: the water collecting pipe (3) is a perforated steel flower pipe with the diameter of 50mm and the length of 100 cm; the water collecting pipe (3) is in lap joint with the water discharging pipe (2) by 10 cm; and the longitudinal arrangement distance of the water collecting pipes (3) is 1 m.
8. The water-rich railway tunnel bottom draining, pressure reducing and reinforcing structure of claim 1, wherein: the water permeable blind pipe (4) is a hard water permeable blind pipe with the diameter of 60mm, and the water permeable blind pipe (4) is arranged on the outer side of the water collecting pipe (3) and is consistent in length; and the bottom of the water permeable blind pipe (4) is closed so as to prevent silt from entering and blocking the drainage channel.
9. The water-rich railway tunnel bottom draining, pressure reducing and reinforcing structure of claim 1, wherein: consolidate stock (5) and be the cavity slip casting stock, the head end of consolidating stock (5) is the toper structure, sets up the play thick liquid hole (5a) that the several link up the inside and outside wall on consolidating stock (5), is equipped with several angle steel barb (5b) at the outer wall of consolidating stock (5) still symmetry or asymmetric, and angle steel barb (5b) are used for increasing the anchor with ground around.
10. The water-rich railway tunnel bottom draining, pressure reducing and reinforcing structure of claim 9, wherein: the reinforcing anchor rods (5) are hollow grouting anchor rods with the diameter of 25mm, and the total number of the hollow grouting anchor rods is distributed into a plurality according to actual construction requirements; the length of the reinforced anchor rod (5) is embedded into the bottom bedrock to be not less than 1 m; the distance between the adjacent slurry outlet holes (5a) is 200 mm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111042843A (en) * | 2019-12-16 | 2020-04-21 | 中铁十四局集团大盾构工程有限公司 | Pre-anchoring method for underground excavated tunnel |
| CN112253172A (en) * | 2020-10-16 | 2021-01-22 | 中铁第四勘察设计院集团有限公司 | Tunnel bottom lining structure with tie beam and construction method thereof |
| CN112377255A (en) * | 2021-01-18 | 2021-02-19 | 中铁工程设计咨询集团有限公司 | Tunnel anchoring type tunnel bottom structure and construction method thereof |
| WO2022017226A1 (en) * | 2020-07-20 | 2022-01-27 | 中铁二院工程集团有限责任公司 | Grouting structure filled with soluble crystal and construction method |
-
2019
- 2019-03-13 CN CN201920319422.3U patent/CN209780957U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111042843A (en) * | 2019-12-16 | 2020-04-21 | 中铁十四局集团大盾构工程有限公司 | Pre-anchoring method for underground excavated tunnel |
| WO2022017226A1 (en) * | 2020-07-20 | 2022-01-27 | 中铁二院工程集团有限责任公司 | Grouting structure filled with soluble crystal and construction method |
| CN112253172A (en) * | 2020-10-16 | 2021-01-22 | 中铁第四勘察设计院集团有限公司 | Tunnel bottom lining structure with tie beam and construction method thereof |
| CN112377255A (en) * | 2021-01-18 | 2021-02-19 | 中铁工程设计咨询集团有限公司 | Tunnel anchoring type tunnel bottom structure and construction method thereof |
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