CN112302688A - End plugging device suitable for back grouting of assembled tunnel supporting structure and construction method thereof - Google Patents
End plugging device suitable for back grouting of assembled tunnel supporting structure and construction method thereof Download PDFInfo
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- CN112302688A CN112302688A CN202011212997.9A CN202011212997A CN112302688A CN 112302688 A CN112302688 A CN 112302688A CN 202011212997 A CN202011212997 A CN 202011212997A CN 112302688 A CN112302688 A CN 112302688A
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- 238000010276 construction Methods 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 72
- 238000002347 injection Methods 0.000 claims abstract description 38
- 239000007924 injection Substances 0.000 claims abstract description 38
- 239000002689 soil Substances 0.000 claims abstract description 21
- 239000002002 slurry Substances 0.000 claims abstract description 12
- 238000009412 basement excavation Methods 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 20
- 239000011435 rock Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 239000004567 concrete Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 238000005187 foaming Methods 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 2
- 238000007569 slipcasting Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses an end plugging device suitable for back grouting of an assembled tunnel supporting structure and a construction method thereof.A thick cushion is adhered to one side of a main pipeline, which is in contact with a rock-soil layer, and water injection ports are arranged every two meters along the length direction of the main pipeline; if the section of the assembled supporting duct piece is open, the main pipeline is in an arc shape matched with the assembled supporting duct piece, and the pins are in a closed form and are wrapped by soft pads; if the section of the assembled supporting structure is closed, the main pipeline forms a closed ring according to the shape of the section of the assembled supporting duct piece, and the soft cushion ring is wrapped on the outer side of the pipeline; the gap between the assembled supporting duct piece and the rock-soil layer is plugged by means of water injection pressure in the main pipeline, so that the grouting body is tightly filled, and slurry leakage is prevented. The grouting device is simple and convenient to operate, high in reliability, green and environment-friendly, grouting leakage caused by over-short excavation is avoided, integrity of a grouting layer can be guaranteed, and construction quality of the grouting layer is effectively guaranteed.
Description
Technical Field
The invention relates to the field of tunnel support, in particular to an end plugging device suitable for back grouting of an assembled tunnel support structure and a construction method thereof.
Background
When the assembled supporting structure is applied to the field of tunnel supporting, grouting needs to be performed behind the wall of the supporting structure, so that the supporting structure is well combined with a rock body to improve the stress performance. The tunnel construction is generally a construction mode of excavating one section and supporting and assembling one section, grouting is needed immediately after assembling is finished, and the next section is excavated after a supporting system is formed; in the grouting process, the end part of the cross section of the supporting duct piece and the surface of the rock body cannot be well sealed due to the uneven surface of the rock body, so that the end part of the cross section of the supporting duct piece is sealed by adopting a certain constructional measure, a sealed space is formed between the end part of the cross section of the supporting duct piece and the rock body after the wall of the supporting duct piece is supported, grouting is performed inwards through a grouting hole reserved in the supporting duct piece, and the grouting amount and the grouting pressure are monitored to ensure the grouting compactness.
The existing measures for preventing the end part of the supporting duct piece from leaking slurry are generally sponge filling plugging or plugging by injecting double-liquid slurry into the back clearance of the end part wall of the duct piece (a construction method 201810060111.X for grouting the back of the duct piece wall of the shield tunnel).
The prior technical scheme has the following defects:
1. the sponge used alone has insufficient plugging compactness, is easy to deform and damage under the extrusion of a grouting body, and is a disposable plugging material, so that the waste of building materials is caused.
2. The grouting range and the grouting amount of the double-liquid grouting plugging are difficult to control, the double-liquid grouting is a permanent plugging, the strength of the double-liquid grouting plugging is different from that of the grouting body, and the integrity of the grouting body can be affected by the double-liquid grouting plugging in the middle of the grouting body.
Disclosure of Invention
The invention aims to provide an end plugging device suitable for back grouting of an assembled tunnel supporting structure and a construction method thereof, and aims to solve the problems in the background technology.
An end plugging device suitable for back grouting of an assembled tunnel supporting structure comprises a main pipeline, wherein the cross section of the main pipeline is a diversified special-shaped pipeline, and the pipe diameter of the main pipeline is determined according to the width of a gap behind a wall under actual working conditions;
the main pipeline is annularly arranged at the rear end part of the wall of the supporting structure;
the main pipeline is adhered with a thick cushion at one side contacting with the rock-soil layer and is used for filling a small gap between the upper part of the main pipeline and the rock-soil layer caused by the overbreak and the underexcavation;
the water injection method comprises the following steps that a water injection port is arranged every two meters along the length direction of a main pipeline, the full length of the water injection port is arranged on the outer side of the pipe wall of the main pipeline, the specific number of the water injection ports is determined according to the length of the pipeline, and each water injection port is provided with a ball valve for water injection and drainage;
if the section of the assembled supporting duct piece is open, the main pipeline is in an arc shape matched with the assembled supporting duct piece, and the pins are in a closed form and are wrapped by soft pads;
if the section of the assembly supporting structure is closed, the main pipeline forms a closed ring shape according to the shape of the section of the assembly supporting duct piece, and the soft cushion ring is wrapped on the outer side of the pipeline;
the splicing support segment is provided with a grouting port;
the lower part of the main pipeline is tightly attached to the surface of the assembled supporting segment by depending on the water injection pressure in the main pipeline, and a soft cushion at the upper part of the main pipeline is extruded to fill a small gap between the upper part of the main pipeline and a rock-soil layer; the main pipeline is plugged in a gap between the assembled supporting duct piece and the rock-soil layer by utilizing the friction force among the assembled supporting duct piece, the main pipeline and the rock-soil layer, so that the grouting layer is compactly filled, and the slurry leakage is prevented.
The preferable scheme of the end plugging device suitable for back grouting of the assembled tunnel supporting structure is that the section form of the main pipeline comprises a circular section, a rectangular section, a trapezoidal section, a hexagonal section or a special-shaped section in other forms; the section shape of the pipe takes the main pipeline as a selection standard to form good contact with the surface of an assembled supporting segment;
when the assembled supporting duct piece is in a flat plate shape, a rectangular section, a trapezoidal section and a hexagonal section are selected, and the plugging friction force is increased through the special section form;
when the assembled supporting duct piece is corrugated, a circular section is preferably selected;
when the assembled supporting duct piece is in other shapes, a proper main pipeline section form is selected according to actual working conditions.
The end plugging device suitable for back grouting of the assembled tunnel supporting structure has the preferred scheme that the height of the section of a main pipeline depends on the width of a gap between an assembled supporting duct piece and a rock-soil layer, and the average width of the gap is generally equal to the average width of the gap.
The preferable scheme of the end plugging device suitable for back grouting of the assembled tunnel supporting structure is that the main pipeline is made of rubber or other materials with good ductility; and a multi-layer main body pipe with different materials on the surface and inside can be adopted.
The utility model provides a be suitable for end plugging device of assembled tunnel supporting construction back slip casting, its preferred scheme does the material of cushion is the rubber and plastic sponge or adopts other materials that have good elasticity.
The end plugging device suitable for back grouting of the assembled tunnel supporting structure has the advantages that water injected from the water injection port can be replaced by other flowing bodies, such as oil, composite slurry and foaming materials.
The end plugging device suitable for back grouting of the assembled tunnel supporting structure has the advantages that the ball valve arranged on the water filling port can be replaced by a water stop valve in other forms, or a water filling pressure gauge detection device is additionally arranged to control the pressure in the pipe.
An end plugging device suitable for back grouting of an assembled tunnel supporting structure and a construction method thereof are disclosed, and the construction method comprises the following steps:
1) after the assembly of the supporting duct pieces is completed, the main pipeline is annularly arranged at the rear end part of the duct piece wall, one side with the cushion is arranged above, one side with the water filling port is arranged outside, and a duct piece transverse connecting bolt hole is reserved at the transverse arrangement depth so as to ensure that the excavation assembly work of the next stage is not influenced after grouting is completed;
2) after the step 1) is finished, water can be injected through a reserved water injection port, after a water pipe is filled, the water pipe is tightly embedded between a rock stratum and a supporting structure through manual observation, and water injection can be stopped and a ball valve can be closed when the water pipe is difficult to move transversely due to the friction force of a rubber material;
3) the main pipeline and the cushion have good ductility, the main pipeline after water injection is tightly plugged in a gap between the supporting structure and the rock stratum, at the moment, a closed space is formed between the supporting duct piece wall and the rock stratum, grouting can be performed through a grouting opening reserved in the supporting duct piece, and the grouting effect can be monitored through the grouting amount and the grouting pressure;
4) after grouting is finished and the grouting concrete reaches initial setting, opening the ball valve to discharge water in the main pipeline, and removing the main pipeline from the segment wall, wherein the construction of the main body of the tunnel supporting structure in the stage is finished, and the wall post-grouting layer in the previous stage are combined into a whole, so that the tunnel excavation and supporting work in the next stage can be carried out;
5) and checking whether the main pipeline has the damage conditions of hole breaking, overlarge local deformation, water leakage of a water injection port and the like, and if all the performances of the main pipeline are normal, reusing the main pipeline in the next stage for plugging the leakage-proof slurry.
Compared with the prior art, the invention has the beneficial effects that:
1. the plugging device is an assembled temporary plugging device, the plugging device is disassembled after the construction of the grouting layer is completed, and the grouting work of the next stage directly takes the end face of the grouting layer of the stage as the initial grouting surface, so that the integrity of the grouting layer is ensured;
2. the invention has convenient disassembly and assembly, needs small working surface and can complete construction without special professional equipment;
3. due to the cross section shape of the main pipeline, after the plugging is carried out by using the plugging device, the end face of the grouting layer is arc-shaped or special-shaped, so that the plugging device is favorable for being well combined with the grouting layer at the next stage to a certain extent;
4. the material used by the invention has the characteristic of environmental protection, and the main equipment can be repeatedly used, thereby conforming to the strategy of sustainable development.
Drawings
FIG. 1 is an elevational view of an end plugging device suitable for use in a semi-circular open section support structure;
FIG. 2 is an elevational view of an end plugging device suitable for use in a circular closed section support structure;
FIG. 3 is a cross-sectional view of a main conduit in four different cross-sectional forms;
FIG. 4 is a transverse elevation view of the tip plugging device under actual conditions;
FIG. 5 is a longitudinal cross-sectional view of the tip plugging device under actual conditions;
fig. 6 is a detailed view of a node at the location of the tip plugging device of fig. 5.
In the figure: 1. the device comprises a main pipeline, 2, a water filling port, 3, a cushion, 4, an assembled supporting segment, 5, a rock-soil layer, 6, a ball valve, 7, a grouting port and 8, wherein a grouting layer is arranged behind a last-stage wall.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The end plugging device suitable for back grouting of the assembled tunnel supporting structure comprises a main pipeline 1, wherein the cross section of the main pipeline 1 is a diversified special-shaped pipeline, and the pipe diameter of the main pipeline is determined according to the width of a gap behind the wall under actual working conditions;
the main pipeline 1 is annularly arranged at the rear end part of the wall of the supporting structure;
the main pipeline 1 is adhered with a thick cushion 3 at one side contacting with the rock-soil layer 5, and is used for filling a small gap between the upper part of the main pipeline 1 and the rock-soil layer 5 caused by over-under excavation;
the water injection method comprises the following steps that (1) a water injection port 2 is arranged every two meters along the length direction of a main pipeline 1, the whole length of the water injection port is arranged on the outer side of the pipe wall of the main pipeline 1, the specific number of the water injection ports 2 is determined according to the length of the pipeline, and each water injection port 2 is provided with a ball valve 6 for water injection and drainage;
if the section of the assembled supporting duct piece 4 is open, the main pipeline 1 is arc-shaped and matched with the assembled supporting duct piece 4, and the pins are in a closed form and are wrapped by the soft cushion 3;
if the section of the assembly supporting structure is closed, the main pipeline 1 forms a closed ring shape according to the shape of the section of the assembly supporting duct piece 4, and the soft cushion 3 is annularly wrapped on the outer side of the pipeline;
the assembling support segment is provided with a grouting opening 7;
the lower part of the main pipeline 1 is tightly attached to the surface of an assembled supporting duct piece 4 by means of water injection pressure in the main pipeline 1, and a cushion 3 at the upper part of the main pipeline 1 is extruded to fill a small gap between the upper part of the main pipeline 1 and a rock-soil layer 5; the main pipeline 1 is plugged in a gap between the assembled supporting duct piece 4 and the rock-soil layer 5 by utilizing the friction force among the assembled supporting duct piece 4, the main pipeline 1 and the rock-soil layer 5, so that the grouting layer is compactly filled, and the slurry leakage is prevented.
The section form of the main pipeline 1 comprises a circular section, a rectangular section, a trapezoidal section, a hexagonal section or other special-shaped sections; the section shape of the pipe takes the main pipeline as the selection standard to form good contact with the surface of the assembled supporting segment 4;
when the assembled supporting duct piece 4 is in a flat plate shape, a rectangular section, a trapezoidal section and a hexagonal section are selected, and the plugging friction force is increased through the special section form;
when the assembled supporting duct piece 4 is corrugated, a circular section is preferably selected;
when the assembled supporting duct piece 4 is in other shapes, a proper main pipeline section form is selected according to actual working conditions.
The height of the section of the main pipeline 1 depends on the width of a gap between an assembled supporting segment and a rock-soil layer, and is generally equal to the average width of the gap.
The main pipeline 1 is made of rubber or other materials with good ductility; and a multi-layer main body pipe with different materials on the surface and inside can be adopted.
The material of cushion 3 is the rubber and plastic sponge or adopts other materials that have good elasticity.
The water injected by the water injection port 2 can be replaced by other fluid, such as oil, composite slurry, and foaming material.
The ball valve arranged on the water filling port 2 can be replaced by a water stop valve in other forms or a water filling pressure gauge detection device is additionally arranged to control the pressure in the pipe.
A construction method of an end plugging device suitable for back grouting of an assembled tunnel supporting structure comprises the following construction steps:
1) after the assembly of the supporting duct pieces is completed, the main pipeline 1 is annularly arranged at the rear end part of the duct piece wall, one side with the cushion 3 is arranged above, one side with a water filling port is arranged outside, and a duct piece transverse connecting bolt hole is reserved at the transverse arrangement depth so as to ensure that the excavation assembly work of the next stage is not influenced after grouting is completed;
2) after the step 1) is finished, water can be injected through the reserved water injection port 2, after the water pipe is filled, the water pipe is tightly embedded between the rock stratum and the supporting structure through manual observation, and water injection can be stopped and the ball valve 6 can be closed when the water pipe is difficult to move transversely due to the friction force of the rubber material;
3) the main pipeline 1 and the cushion 3 have good ductility, the main pipeline 1 after water injection is tightly plugged in a gap between a supporting structure and a rock stratum, at the moment, a closed space is formed between the wall of the supporting duct piece and the rock stratum, grouting can be performed through a grouting opening 7 reserved in the supporting duct piece, and the grouting effect can be monitored through the grouting amount and the grouting pressure;
4) after grouting is finished and the grouting concrete reaches initial setting, opening the ball valve 6 to discharge water in the main pipeline, and removing the main pipeline 1 from the segment wall, at the moment, the construction of the main body of the tunnel supporting structure in the stage is finished, and the wall post-grouting layer 8 in the previous stage are combined into a whole, so that the tunnel excavation and supporting work in the next stage can be carried out;
5) whether the main pipeline 1 has the damage conditions of hole breaking, overlarge local deformation, water leakage of the water injection port 2 and the like is checked, and if all the performances of the main equipment are normal, the main pipeline can be repeatedly used for the slurry leakage prevention plugging work of the next stage.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof.
Claims (8)
1. The utility model provides a be suitable for end plugging device of assembled tunnel supporting construction back slip casting which characterized in that: the pipeline comprises a main pipeline, wherein the cross section of the main pipeline is a diversified special-shaped pipeline, and the pipe diameter of the main pipeline is determined according to the width of a gap behind a wall under actual working conditions;
the main pipeline is annularly arranged at the rear end part of the wall of the supporting structure;
the main pipeline is adhered with a thick cushion at one side contacting with the rock-soil layer and is used for filling a small gap between the upper part of the main pipeline and the rock-soil layer caused by the overbreak and the underexcavation;
the water injection method comprises the following steps that a water injection port is arranged every two meters along the length direction of a main pipeline, the full length of the water injection port is arranged on the outer side of the pipe wall of the main pipeline, the specific number of the water injection ports is determined according to the length of the pipeline, and each water injection port is provided with a ball valve for water injection and drainage;
if the section of the assembled supporting duct piece is open, the main pipeline is in an arc shape matched with the assembled supporting duct piece, and the pins are in a closed form and are wrapped by soft pads;
if the section of the assembly supporting structure is closed, the main pipeline forms a closed ring shape according to the shape of the section of the assembly supporting duct piece, and the soft cushion ring is wrapped on the outer side of the pipeline;
the splicing support segment is provided with a grouting port;
the lower part of the main pipeline is tightly attached to the surface of the assembled supporting segment by depending on the water injection pressure in the main pipeline, and a soft cushion at the upper part of the main pipeline is extruded to fill a small gap between the upper part of the main pipeline and a rock-soil layer; the main pipeline is plugged in a gap between the assembled supporting duct piece and the rock-soil layer by utilizing the friction force among the assembled supporting duct piece, the main pipeline and the rock-soil layer, so that the grouting layer is compactly filled, and the slurry leakage is prevented.
2. The end plugging device suitable for back grouting of the assembled tunnel supporting structure according to claim 1, wherein: the section form of the main pipeline comprises a circular section, a rectangular section, a trapezoidal section, a hexagonal section or other special-shaped sections; the section shape of the pipe takes the main pipeline as a selection standard to form good contact with the surface of an assembled supporting segment;
when the assembled supporting duct piece is in a flat plate shape, a rectangular section, a trapezoidal section and a hexagonal section are selected, and the plugging friction force is increased through the special section form;
when the assembled supporting duct piece is corrugated, a circular section is preferably selected;
when the assembled supporting duct piece is in other shapes, a proper main pipeline section form is selected according to actual working conditions.
3. The end plugging device suitable for back grouting of the assembled tunnel supporting structure according to claim 1, wherein: the height of the section of the main pipeline depends on the width of a gap between the assembled supporting duct piece and the rock-soil layer, and is generally equal to the average width of the gap.
4. The end plugging device suitable for back grouting of the assembled tunnel supporting structure according to claim 1, wherein: the main pipeline is made of rubber or other materials with good ductility; and a multi-layer main body pipe with different materials on the surface and inside can be adopted.
5. The end plugging device suitable for back grouting of the assembled tunnel supporting structure according to claim 1, wherein: the material of cushion is the rubber and plastic sponge or adopts other materials that have good elasticity.
6. The end plugging device suitable for back grouting of the assembled tunnel supporting structure according to claim 1, wherein: the water injected from the water injection port can be replaced by other fluid, such as oil, composite slurry and foaming material.
7. The end plugging device suitable for back grouting of the assembled tunnel supporting structure according to claim 1, wherein: the ball valve arranged on the water filling port can be replaced by a water stop valve in other forms, or a water filling pressure gauge detection device is additionally arranged to control the pressure in the pipe.
8. The construction method of the end plugging device suitable for back grouting of the assembled tunnel supporting structure according to claim 1 comprises the following construction steps:
1) after the assembly of the supporting duct pieces is completed, the main pipeline is annularly arranged at the rear end part of the duct piece wall, one side with the cushion is arranged above, one side with the water filling port is arranged outside, and a duct piece transverse connecting bolt hole is reserved at the transverse arrangement depth so as to ensure that the excavation assembly work of the next stage is not influenced after grouting is completed;
2) after the step 1) is finished, water can be injected through a reserved water injection port, after a water pipe is filled, the water pipe is tightly embedded between a rock stratum and a supporting structure through manual observation, and water injection can be stopped and a ball valve can be closed when the water pipe is difficult to move transversely due to the friction force of a rubber material;
3) the main pipeline and the cushion have good ductility, the main pipeline after water injection is tightly plugged in a gap between the supporting structure and the rock stratum, at the moment, a closed space is formed between the supporting duct piece wall and the rock stratum, grouting can be performed through a grouting opening reserved in the supporting duct piece, and the grouting effect can be monitored through the grouting amount and the grouting pressure;
4) after grouting is finished and the grouting concrete reaches initial setting, opening the ball valve to discharge water in the main pipeline, and removing the main pipeline from the segment wall, wherein the construction of the main body of the tunnel supporting structure in the stage is finished, and the wall post-grouting layer in the previous stage are combined into a whole, so that the tunnel excavation and supporting work in the next stage can be carried out;
5) and checking whether the main pipeline has the damage conditions of hole breaking, overlarge local deformation, water leakage of a water injection port and the like, and if all the performances of the main pipeline are normal, reusing the main pipeline in the next stage for plugging the leakage-proof slurry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011212997.9A CN112302688A (en) | 2020-11-04 | 2020-11-04 | End plugging device suitable for back grouting of assembled tunnel supporting structure and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011212997.9A CN112302688A (en) | 2020-11-04 | 2020-11-04 | End plugging device suitable for back grouting of assembled tunnel supporting structure and construction method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN112302688A true CN112302688A (en) | 2021-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011212997.9A Pending CN112302688A (en) | 2020-11-04 | 2020-11-04 | End plugging device suitable for back grouting of assembled tunnel supporting structure and construction method thereof |
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| Country | Link |
|---|---|
| CN (1) | CN112302688A (en) |
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