CN111648825A - Tunnel collapsed cavity rapid retaining wall and emergency treatment construction process - Google Patents
Tunnel collapsed cavity rapid retaining wall and emergency treatment construction process Download PDFInfo
- Publication number
- CN111648825A CN111648825A CN202010555166.5A CN202010555166A CN111648825A CN 111648825 A CN111648825 A CN 111648825A CN 202010555166 A CN202010555166 A CN 202010555166A CN 111648825 A CN111648825 A CN 111648825A
- Authority
- CN
- China
- Prior art keywords
- filling material
- ton
- tunnel
- liquid
- barrel
- 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.)
- Pending
Links
- 238000010276 construction Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims description 20
- 230000008569 process Effects 0.000 title claims description 16
- 239000000463 material Substances 0.000 claims abstract description 119
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000000945 filler Substances 0.000 claims abstract description 13
- 239000002893 slag Substances 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims description 61
- 230000003068 static effect Effects 0.000 claims description 19
- 239000012528 membrane Substances 0.000 claims description 11
- 238000005187 foaming Methods 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 230000015556 catabolic process Effects 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000008439 repair process Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000011435 rock Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/103—Dams, e.g. for ventilation
- E21F17/107—Dams, e.g. for ventilation inflatable
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The utility model provides a tunnel collapses quick barricade of intracavity and emergency treatment construction technology, quick barricade includes a plurality of ton buckets that the interval set up between the tunnel inner wall, be provided with filler material between ton bucket and the ton bucket. The gap between the ton barrel and the gap between the ton barrel and the tunnel inner wall are filled with high-expansion silicate filling materials and are extruded to be compact, so that a quick retaining wall is formed, and the problem that collapsed slag flows in the tunnel is effectively solved.
Description
Technical Field
The invention relates to the technical field of emergency treatment in a tunnel collapse cavity, in particular to a rapid retaining wall in the tunnel collapse cavity and an emergency treatment construction process.
Background
With the development of tunnel construction in China, tunnel engineering construction in unfavorable geological areas is increasing day by day. If the treatment is improper in the construction process, engineering disasters such as collapse, mud burst and water burst, surface subsidence, instability of a hole body and the like are easily caused, and even the life safety of field construction personnel is threatened.
In actual engineering, once a tunnel cavity collapse accident occurs, the existence of the collapsed cavity can suspend the tunnel part in the air, so that the safety and reliability of the tunnel are greatly reduced; the deposits in the collapsed cavity are easy to collapse and sink, so that the structural stability of the tunnel is influenced; if the collapse cavity is rich in water, the liquidity of deposits in the collapse cavity is good, and the construction and safety of the tunnel are seriously affected.
The existing method for treating the collapsed cavity of the tunnel mainly comprises concrete backfill reinforcement and grouting, the collapsed cavity needs to be supported and reinforced, however, in the construction process of anchor-spraying support of the collapsed cavity, the construction of drilling an anchor rod hole disturbs broken surrounding rocks, the surrounding rocks are easy to continuously collapse, and the safety of constructors is endangered; the collapsed cavity is required to be completely backfilled with concrete, and the method can change the surrounding rock stress of the tunnel and is also not in line with economic requirements; in the treatment process, collapsed slag bodies need to be removed in time, and the collapsed slag bodies are prevented from continuously flowing in the tunnel, so that the tunnel construction and safety are influenced. This is a disadvantage in the prior art.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a tunnel collapse cavity fast retaining wall and an emergency treatment construction process, wherein gaps between a ton barrel and the ton barrel and between the ton barrel and the tunnel inner wall are filled with a high-expansion silicate filling material and are extruded to be compact, so that the fast retaining wall is formed, and the problem that collapsed slag flows in the tunnel is effectively solved.
The scheme is realized by the following technical measures: the utility model provides a tunnel collapses quick barricade of intracavity, includes a plurality of ton buckets that the interval set up between the tunnel inner wall, be provided with filler material between ton bucket and the ton bucket.
Preferably, the filling material comprises a film bag, a filling material filling opening is formed in the film bag, and a high-expansion silicate filling material is arranged in the film bag.
Preferably, the ton barrels are arranged in a straight line, and the length of each ton barrel is 1m, and the width of each ton barrel is 1.15 m.
Preferably, a tray is fixedly connected to the lower portion of the ton barrel. The tray is fixedly arranged below the ton barrel, and convenience is brought to carrying and transportation of the ton barrel.
A tunnel collapse cavity emergency treatment construction process comprises the following steps:
(1) preparing a high expansion silicate filler material;
(2) selecting a proper number of ton buckets to be linearly placed according to the specific size of the tunnel, and keeping gaps between the ton buckets and the inner wall of the tunnel and between the ton buckets;
(3) film bags are placed in the gaps, and filling material injection ports are formed in the film bags and used for injecting high-expansion silicate filling materials;
(4) and injecting the high-expansion silicate filling material into the film bag from the filling material injection port and extruding to be compact, so as to form a quick retaining wall in the tunnel, thereby preventing collapsed slag from continuously flowing in the tunnel.
Preferably, the high expansion silicate filler is formed by foaming filler material A liquid and filler material B liquid in a static mixer.
The volume ratio of the filling material liquid A to the filling material liquid B is 1: 1, the foaming multiplying power is 20-35 times; the maximum exothermic temperature during foaming is less than 70 ℃; the density of the resulting high expansion silicate filler material was 45kg/m 3.
Preferably, the filling material A liquid is arranged in a filling material A liquid barrel, the filling material B liquid is arranged in a filling material B liquid barrel, the filling material A liquid barrel and the filling material B liquid barrel are both communicated with the static mixer through pipelines, and the pipelines are provided with pumps.
Preferably, the length of the ton barrel is 1m, and the width of the ton barrel is 1.15 m; and a tray is fixedly connected below the ton barrel.
Preferably, the high-expansion silicate filling material is prepared on a mobile breakdown van, the mobile breakdown van comprises a van body, a filling material A liquid barrel and a filling material B liquid barrel are fixedly arranged on the van body, filling material A liquid is arranged in the filling material A liquid barrel, filling material B liquid is arranged in the filling material B liquid barrel, the filling material A liquid barrel is communicated with an inlet of a static mixer through a pipeline I, a pump I is arranged on the pipeline I, the filling material B liquid barrel is communicated with an inlet of the static mixer through a pipeline II, a pump II is arranged on the pipeline II, an outlet of the static mixer is connected with a conveying pipe, and an outlet of the static mixer is connected with a filling material filling opening of a membrane bag through the conveying pipe; still be provided with the membrane bag storehouse that is used for placing the membrane bag on the automobile body, pump I and pump II are connected with synchronous controller.
The invention has the following advantages:
(1) the filling material is a high-expansion silicate material, and has the following advantages: the reaction is stable when water exists or water does not exist, the reaction is rapid, the injectability is good, the heat release is low, the flame retardance and the durability are good, and the material is non-toxic and harmless;
(2) the rapid retaining wall consists of a ton barrel and a filled film bag, the material source is wide, and the formation of the rapid retaining wall is simple and convenient and has high speed;
(3) after the tunnel collapse cavity is treated, the quick retaining wall is easy to disassemble.
(4) The high-expansion silicate filling material is prepared on a breakdown van, can be used for breakdown in any place when a tunnel collapses, and is convenient, rapid and efficient.
Therefore, compared with the prior art, the invention has prominent substantive features and remarkable progress, and the beneficial effects of the implementation are also obvious.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic flow diagram of the injection of a high expansion silicate filler material into a film bag;
FIG. 2 is a schematic structural view of a fast retaining wall;
fig. 3 is a schematic structural diagram of a mobile emergency repair vehicle.
In the figure: 1-tunnel inner wall, 2-ton barrel, 3-filling material, 4-membrane bag, 5-static mixer, 6-filling material filling opening, 7-filling material A liquid barrel, 8-filling material B liquid barrel, 9-pump I, 10-pump II, 11-vehicle body, 12-pipeline I, 13-pipeline II, 14-pipeline III, 15-tee joint, 16-conveying pipe and 17-membrane bag bin.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments and drawings. 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 scope of protection of this patent.
Example 1
As shown in fig. 2, the tunnel collapse cavity fast retaining wall comprises a plurality of ton barrels 2 arranged at intervals between tunnel inner walls 1, wherein a filling material 3 is arranged between the ton barrels 2 and the tunnel inner walls 1, and the filling material 3 is arranged between the ton barrels 2 and the ton barrels 2.
The filling material 3 comprises a film bag 4, a filling material filling opening 6 is arranged on the film bag 4, and a high-expansion silicate filling material is arranged in the film bag 4.
The ton barrel 2 is linearly arranged, the length of the ton barrel 2 is 1m, the width of the ton barrel is 1.15m, and the height of the ton barrel is 1 m.
Further, a tray is fixedly connected to the lower portion of the ton barrel 2. The fixed tray that is provided with in ton bucket 2's below facilitates for ton bucket 2's transport, transportation.
Example 2
As shown in fig. 1-2, an emergency treatment construction process in a tunnel collapse cavity comprises the following steps:
(1) preparing a high expansion silicate filler material;
(2) selecting a proper number of ton buckets 2 to be linearly placed according to the specific size of the tunnel, and enabling gaps to be reserved between the ton buckets 2 and the inner wall 1 of the tunnel and between the ton buckets 2 and the ton buckets 2;
(3) film bags 4 are placed in the gaps, and filling material injection ports 6 are formed in the film bags 4 and used for injecting high-expansion silicate filling materials;
(4) the high expansion silicate filling material is injected into the film bag 4 from the filling material injection opening 6 and is extruded to be compact, so that a rapid retaining wall is formed in the tunnel, and therefore the collapsed slag bodies are prevented from flowing continuously in the tunnel.
The high-expansion silicate filling material is formed by foaming a filling material liquid A and a filling material liquid B in a static mixer. The volume ratio of the filling material liquid A to the filling material liquid B is 1: 1, the foaming multiplying power is 20-35 times; the maximum exothermic temperature during foaming is less than 70 ℃; the density of the resulting high expansion silicate filler material was 45kg/m 3. The filling material A liquid and the filling material B liquid are two materials commonly used for preparing the high-expansion silicate filling material in the prior art, preferably, the filling material A liquid and the filling material B liquid can be directly obtained from Shandong Hongtong engineering science and technology Limited company, and are not described herein any more, and the high-expansion silicate filling material is an HSP-2 material.
The filling material A liquid is arranged in a filling material A liquid barrel 7, the filling material B liquid is arranged in a filling material B liquid barrel 8, the filling material A liquid barrel 7 and the filling material B liquid barrel 8 are communicated with the static mixer 5 through pipelines, and the pipelines are provided with pumps.
The length of the ton barrel 2 is 1m, the width is 1.15m, and the height is 1 m. And a tray is fixedly connected below the ton barrel 2. The fixed tray that is provided with in below of ton bucket facilitates for transport, the transportation of ton bucket 2.
After the gaps between the ton barrels 2 and between the ton barrels 2 and the tunnel inner wall 1 are filled with the high-expansion silicate filling material and are extruded to be compact, a quick retaining wall is formed in the tunnel, so that collapsed slag bodies are prevented from continuously flowing in the tunnel, and tunnel construction and safety are guaranteed.
Example 3
The difference from example 2 is that the high expansion silicate filler material was prepared on a mobile emergency repair vehicle, as shown in fig. 3, the mobile emergency repair vehicle comprises a vehicle body 11, wherein a filling material A liquid barrel 7 and a filling material B liquid barrel 8 are fixedly arranged on the vehicle body 11, the filling material A liquid barrel 7 is internally provided with filling material A liquid, the filling material B liquid barrel 8 is internally provided with filling material B liquid, the filling material A liquid barrel 7 is communicated with the inlet of the static mixer 5 through a pipeline I12, a pump I9 is arranged on the pipeline I12, the filling material B barrel 8 is communicated with the inlet of the static mixer 5 through a pipeline II13, a pump II10 is arranged on the pipeline II13, the outlet of the static mixer 5 is connected with a conveying pipe 16, the outlet of the static mixer 5 can be connected with the filling material injection opening of the membrane bag 4 through a delivery pipe 16; the trolley body 11 is also provided with a membrane bag bin 17 for placing the membrane bags 4, and the pump I9 and the pump II10 are connected with a synchronous controller. The emergency repair of the tunnel in the cavity collapse process can be facilitated, and the method is quick and efficient; the synchronous controller can ensure that the filling material A liquid and the filling material B liquid are mixed and reacted according to a set proportion, the foaming ratio is high, and the obtained material has high strength.
Further, the pipeline I12 and the pipeline II13 are connected with one end of a pipeline III 14 through a tee joint 15, and the other end of the pipeline III 14 is connected with an inlet of the static mixer 5.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features and inventive features disclosed herein.
Claims (10)
1. The utility model provides a quick barricade in tunnel collapse chamber which characterized by: the tunnel comprises a plurality of ton barrels arranged between inner walls of tunnels at intervals, wherein filling materials are arranged between the ton barrels and the inner walls of the tunnels, and the filling materials are arranged between the ton barrels and the ton barrels.
2. The rapid retaining wall in a tunnel collapse cavity according to claim 1, which is characterized in that: the filling material comprises a film bag, a filling material filling opening is formed in the film bag, and a high-expansion silicate filling material is arranged in the film bag.
3. The rapid retaining wall in a tunnel collapse cavity according to claim 1, which is characterized in that: the ton bucket is arranged linearly, the length of the ton bucket is 1m, and the width of the ton bucket is 1.15 m.
4. The rapid retaining wall in a tunnel collapse cavity according to claim 1, which is characterized in that: and a tray is fixedly connected below the ton barrel.
5. A tunnel collapse cavity emergency treatment construction process is characterized in that: the method comprises the following steps:
(1) preparing a high expansion silicate filler material;
(2) selecting a proper number of ton buckets to be linearly placed according to the specific size of the tunnel, and keeping gaps between the ton buckets and the inner wall of the tunnel and between the ton buckets;
(3) film bags are placed in the gaps, and filling material injection ports are formed in the film bags and used for injecting high-expansion silicate filling materials;
(4) and injecting the high-expansion silicate filling material into the film bag from the filling material injection port and extruding to be compact, so as to form a quick retaining wall in the tunnel, thereby preventing collapsed slag from continuously flowing in the tunnel.
6. The emergency treatment construction process in the tunnel collapse cavity as claimed in claim 5, which is characterized in that: the high-expansion silicate filling material is formed by foaming a filling material liquid A and a filling material liquid B in a static mixer.
7. The emergency treatment construction process in the tunnel collapse cavity as claimed in claim 6, which is characterized in that: the volume ratio of the filling material liquid A to the filling material liquid B is 1: 1, the foaming multiplying power is 20-35 times; the maximum exothermic temperature during foaming is less than 70 ℃; the density of the resulting high expansion silicate filler material was 45kg/m 3.
8. The emergency treatment construction process in the tunnel collapse cavity as claimed in claim 5, which is characterized in that: the filling material A liquid is arranged in a filling material A liquid barrel, the filling material B liquid is arranged in a filling material B liquid barrel, the filling material A liquid barrel and the filling material B liquid barrel are communicated with the static mixer through pipelines, and the pipelines are provided with pumps.
9. The emergency treatment construction process in the tunnel collapse cavity as claimed in claim 5, which is characterized in that: the length of the ton barrel is 1m, and the width of the ton barrel is 1.15 m; and a tray is fixedly connected below the ton barrel.
10. The emergency treatment construction process in the tunnel collapse cavity as claimed in claim 8, wherein: the high-expansion silicate filling material is prepared on a mobile breakdown van, the mobile breakdown van comprises a car body, a filling material A liquid barrel and a filling material B liquid barrel are fixedly arranged on the car body, filling material A liquid is arranged in the filling material A liquid barrel, filling material B liquid is arranged in the filling material B liquid barrel, the filling material A liquid barrel is communicated with an inlet of a static mixer through a pipeline I, a pump I is arranged on the pipeline I, the filling material B liquid barrel is communicated with an inlet of the static mixer through a pipeline II, a pump II is arranged on the pipeline II, an outlet of the static mixer is connected with a conveying pipe, and an outlet of the static mixer can be connected with a filling material filling opening of a membrane bag through the conveying pipe; still be provided with the membrane bag storehouse that is used for placing the membrane bag on the automobile body, pump I and pump II are connected with synchronous controller.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2020105461739 | 2020-06-16 | ||
| CN202010546173 | 2020-06-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111648825A true CN111648825A (en) | 2020-09-11 |
Family
ID=72343822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010555166.5A Pending CN111648825A (en) | 2020-06-16 | 2020-06-17 | Tunnel collapsed cavity rapid retaining wall and emergency treatment construction process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111648825A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3246965A1 (en) * | 1982-12-18 | 1984-06-20 | Bergwerksverband Gmbh, 4300 Essen | Monitoring device for spoil-hoisting installations |
| CN203213116U (en) * | 2013-04-11 | 2013-09-25 | 河南博特工程防护有限公司 | Integrated type high polymer grouting system |
| CN203756230U (en) * | 2014-02-13 | 2014-08-06 | 山西晋煤集团技术研究院有限责任公司 | Mold bag type sealed retaining wall capable of being quickly formed |
| CN106050302A (en) * | 2016-07-19 | 2016-10-26 | 河南理工大学 | Constructing system and method for coal mine permanent sealing wall |
| CN107558438A (en) * | 2017-08-17 | 2018-01-09 | 中国人民解放军后勤工程学院 | A kind of flood fighting barricade and its construction method |
| CN109594524A (en) * | 2018-12-21 | 2019-04-09 | 大连交通大学 | A kind of harbour retaining wall and construction technology |
-
2020
- 2020-06-17 CN CN202010555166.5A patent/CN111648825A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3246965A1 (en) * | 1982-12-18 | 1984-06-20 | Bergwerksverband Gmbh, 4300 Essen | Monitoring device for spoil-hoisting installations |
| CN203213116U (en) * | 2013-04-11 | 2013-09-25 | 河南博特工程防护有限公司 | Integrated type high polymer grouting system |
| CN203756230U (en) * | 2014-02-13 | 2014-08-06 | 山西晋煤集团技术研究院有限责任公司 | Mold bag type sealed retaining wall capable of being quickly formed |
| CN106050302A (en) * | 2016-07-19 | 2016-10-26 | 河南理工大学 | Constructing system and method for coal mine permanent sealing wall |
| CN107558438A (en) * | 2017-08-17 | 2018-01-09 | 中国人民解放军后勤工程学院 | A kind of flood fighting barricade and its construction method |
| CN109594524A (en) * | 2018-12-21 | 2019-04-09 | 大连交通大学 | A kind of harbour retaining wall and construction technology |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2017388776B2 (en) | Mine anti-explosion trapezoidal sealing wall and construction method therefor | |
| CN103741678B (en) | With the miniature stake of urethane slip casting of stake bag and constructional method thereof and application method | |
| CN106121722A (en) | A kind of method quickly constructing fire dam | |
| CN104895059A (en) | Freezing cement mixing pile and construction method thereof | |
| CN106351312A (en) | Pipeline and construction method thereof | |
| CN103334772A (en) | Slurry capable of stabilizing tunnel face of underground excavation sand layer, slurry preparation method, grouting equipment and grouting process | |
| CN206157860U (en) | Drainage pipeline | |
| CN215289911U (en) | Gravity type wharf structure capable of quickly repairing leaked sand | |
| CN212129147U (en) | Multi-section sleeve valve pipe layered grouting device | |
| CN111648825A (en) | Tunnel collapsed cavity rapid retaining wall and emergency treatment construction process | |
| CN113548844A (en) | Foaming cement soil slurry for backfilling of construction fertilizer groove and construction process | |
| CN108868796A (en) | For wearing skyscraper group construction method under the shield sharp radius curve and heavy grade under water-rich sand layer | |
| CN207944990U (en) | The quick floodgate wall walling equipment of mine and the quick floodgate wall of mine | |
| CN111648821A (en) | Mobile breakdown van for emergency treatment during tunnel collapse | |
| CN108587583A (en) | A kind of high proportion rectangular top pipe mud and preparation method thereof and construction method | |
| CN112761651A (en) | Shield tunneling construction method and backfill structure applied to same | |
| CN203834486U (en) | Rear reinforcement support pile structure | |
| CN203248193U (en) | Connecting old lane filling system of underground coal mine | |
| CN108035772A (en) | The quick floodgate wall walling method of mine and its equipment | |
| CN202788893U (en) | Sealing device for high-pressure grouting anchor cable | |
| JPS62185922A (en) | Expanded mortar injection work in shield tunnel | |
| CN116219949B (en) | Artificial dam structure of coal mine underground reservoir and coal mine underground reservoir | |
| CN220868198U (en) | Underwater anchor cable construction device | |
| CN214787381U (en) | Backfill structure applied to shield tunneling construction method | |
| CN112832775B (en) | Turning underground excavation construction method for square underground well |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200911 |