CN110332009B - Flexible formwork for stirrups - Google Patents
Flexible formwork for stirrups Download PDFInfo
- Publication number
- CN110332009B CN110332009B CN201910636903.1A CN201910636903A CN110332009B CN 110332009 B CN110332009 B CN 110332009B CN 201910636903 A CN201910636903 A CN 201910636903A CN 110332009 B CN110332009 B CN 110332009B
- Authority
- CN
- China
- Prior art keywords
- flexible
- stirrup
- template
- formwork
- flexible template
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000009415 formwork Methods 0.000 title claims description 34
- 239000000835 fiber Substances 0.000 claims abstract description 14
- 239000004744 fabric Substances 0.000 claims description 10
- 238000010276 construction Methods 0.000 abstract description 8
- 239000013305 flexible fiber Substances 0.000 description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000002023 wood Substances 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
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
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/02—Supporting means, e.g. shuttering, for filling-up materials
- E21F15/04—Stowing mats; Goaf wire netting; Partition walls
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)
- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Abstract
The invention discloses a stirrup flexible template, which comprises a closed flexible template, wherein at least one reserved opening, at least one stirrup and a plurality of flanges are arranged on the flexible template, and a plurality of lacing wires are arranged in the flexible template. The stirrup flexible template solves the problems that the conventional fiber flexible template with larger thickness and higher height can generate larger transverse and longitudinal deformation during construction, and a counter-pulling anchor bolt is required to be installed on site, so that the construction speed is slow.
Description
Technical Field
The invention belongs to the technical field of coal mine support, and particularly relates to a stirrup flexible template.
Background
Application number: 201510607404.1, bulletin number: 105201529 B, bulletin day: 2017.12.01, the invention relates to a flexible fiber template with double transverse pulling fibers for gob-side entry retaining, which relates to a flexible fiber template, wherein in the use process of the flexible fiber template, when the thickness of the flexible fiber template is smaller and the height of the flexible fiber template is not higher, the flexible fiber template has good effect, but when the thickness of the flexible fiber template is thicker and the height of the flexible fiber template is higher, the deformation in the transverse direction and the longitudinal direction of the flexible fiber template is larger, even the situation of rupture still occurs, meanwhile, a counter-pulling anchor bolt is required to be installed in an anchor bolt hole in the use process of the flexible fiber template, the counter-pulling anchor bolt is generally made of steel bars or glass fibers, the difference of materials with the flexible fiber template is larger, the deformation is uncoordinated, the rupture of the flexible fiber template is easy to be caused, the underground site construction procedure is increased, the construction speed is reduced, and the cost is improved.
Disclosure of Invention
The invention aims to provide a stirrup flexible template, which solves the problems that the conventional fiber flexible template with larger thickness and higher height can generate larger transverse and longitudinal deformation during construction, a counter-pulling anchor bolt is required to be installed on site, and the construction speed is low.
The technical scheme includes that the stirrup flexible template comprises a closed flexible template, at least one reserved opening, at least one first stirrup and a plurality of flanges are arranged on the flexible template, and a plurality of lacing wires are arranged in the flexible template.
The present invention is also characterized in that,
The first stirrup is arranged inside and/or outside the flexible template.
The first stirrup is fixed on the flexible template through a lacing wire ring.
The surface of the flexible template is provided with a plurality of preformed holes, and a fiber cloth cylinder connected with the preformed holes is arranged between the two corresponding preformed holes.
Each reserved opening is provided with a fiber cloth cylinder.
And second stirrups are arranged in the fiber cloth barrels between the two corresponding preformed holes, and two ends of each second stirrup are connected with the corresponding first stirrups.
The flange is positioned below the top of the flexible template, the top of the flange is a top template of the flexible template, and the lower part of the flange is a main template of the flexible template.
The flexible template is of a hexagonal structure, and the plurality of lacing wires are respectively arranged between two opposite side surfaces and/or between every two adjacent side surfaces of the flexible template.
And two ends of the lacing wire are respectively connected with the flexible template through lacing wire rings.
At least one sleeve is arranged on the flange.
The beneficial effects of the invention are as follows: (1) According to the stirrup flexible template, the deformation of the flexible template can be better restrained through the first stirrups and the lacing wires, so that the overall strength and the deformation resistance of the flexible template are greatly enhanced, the flexible template can be finally and effectively prevented from being deformed in the larger transverse direction and the longitudinal direction, meanwhile, the anchor bolts are eliminated, and the situation that the anchor bolts and the flexible template are broken due to the fact that the material difference of the anchor bolts and the flexible template is large and the deformation is uncoordinated is avoided; (2) The flexible formwork for the stirrups reduces the underground site construction procedures, improves the construction speed and reduces the cost. (3) The stirrup flexible template disclosed by the invention has the advantages of simple overall structure, convenience in installation, lower manufacturing cost and good market application prospect.
Drawings
FIG. 1 is a perspective view of a stirrup flexible formwork of the present invention;
FIG. 2 is a front view of a stirrup flexible formwork in accordance with the present invention;
FIG. 3 is a side view of a stirrup flexible formwork of the present invention;
fig. 4 is a cross-sectional view of a stirrup flexible formwork of the present invention.
In the figure: 1. the novel steel wire rope comprises a main body template, a first stirrup, a lacing wire, a reserved opening, a flange, a sleeve, a top template, a reserved hole, a fiber cloth cylinder, a lacing wire ring and a second stirrup, wherein the first stirrup is arranged on the main body template, the lacing wire is arranged on the main body template, the reserved opening is arranged on the main body template, the flange is arranged on the main body template, the sleeve is arranged on the main body template, the top template is arranged on the main body template, the preformed hole is arranged on the main body template, the preformed opening is arranged on the main body template, the first stirrup is arranged on the first stirrup, the first stirrup is arranged on the first stirrup, the preformed opening is arranged on the.
Detailed Description
The technical scheme of the invention is further described in detail below with reference to the accompanying drawings and the detailed description.
As shown in fig. 1, the flexible formwork for stirrups comprises a closed flexible formwork, wherein at least one reserved opening 4, at least one first stirrup 2 and a plurality of flanges 5 are arranged on the flexible formwork, and a plurality of lacing wires 3 are arranged in the flexible formwork.
The flexible template is made of fibers, and the tie bars 3 can limit the lateral deformation of the flexible template after filling, so that the flexible template is uniformly stressed during filling, and meanwhile, the transverse tie bars 3 play a role in fiber pre-stress after the filling material is solidified, so that the strength of the filling body is higher, and the crack resistance is enhanced. When the thickness of the flexible template is larger and the height is higher, the first stirrups 2 arranged on the flexible template can restrict the deformation of the flexible template, enhance the integral strength and deformation resistance of the flexible template, and prevent the flexible template from generating excessive deformation and even cracking.
Therefore, the principle of the stirrup flexible template of the invention is as follows: the first stirrup 2 and the plurality of lacing wires 3 are matched to effectively restrict the deformation of the flexible template, so that the overall strength and the deformation resistance of the flexible template are greatly enhanced, and finally, the flexible template can be prevented from being deformed in the larger transverse and longitudinal directions, and the cracking phenomenon is avoided.
In a flexible formwork for stirrups according to the invention, as shown in fig. 1, the first stirrups 2 are matched to the shape of the flexible formwork, and the first stirrups 2 may be arranged outside the flexible formwork or inside the flexible formwork.
The plurality of first stirrups 2 are used for connecting each position of the inner surface and the outer surface of the stirrup flexible template, and the shape of the first stirrups 2 is various, can be a horizontal structure or a vertical structure formed by single ribs, can be an unsealed structure formed by a plurality of ribs, such as an L-shaped structure, a fold line-shaped structure and the like, and can also be a closed structure formed by a plurality of ribs, such as a polygonal closed structure, a circular closed structure and the like.
In the stirrup flexible template according to the invention, as shown in fig. 2, a plurality of preformed holes 8 are formed in the surface of the flexible template, and a fiber cloth cylinder 9 connected with the preformed holes 8 is arranged between the two corresponding preformed holes 8.
In the stirrup flexible formwork of the present invention, with reference to fig. 2, each of the preformed openings 4 is connected with a fibrous cloth cylinder 9.
The reserved holes 8 can be used for gas drainage, nitrogen injection, grouting, drainage, monitoring and the like according to requirements. The preformed holes 8 arranged on the flexible template can directly pre-embed pipelines such as a gas drainage pipe, a nitrogen injection pipe, a grouting pipe, a drain pipe, a monitoring pipe and the like on the flexible template when the roadway is filled for high gas mines, coal seam easy spontaneous combustion mines and surrounding rock water-rich mines, so that the functions of gas drainage, fire prevention, fire extinguishment, water drainage and the like are realized.
In combination with fig. 3, in the stirrup flexible template of the present invention, the fiber cloth barrels between two corresponding preformed holes 8 are respectively provided with a second stirrup 11, and two ends of the second stirrup 11 are connected with corresponding first stirrups 2, so that the overall structure of the stirrup flexible template can be ensured to be more stable.
Referring to fig. 3, in a stirrup flexible form of the present invention, the first stirrup 2 is fixed in various ways, such as by a lacing wire ring 10, directly sewn to the flexible form, and fixed through the flexible form.
In combination with fig. 3, in the stirrup flexible template of the invention, the flange 5 is positioned below the top of the flexible template, the top connecting template 7 of the flexible template is positioned above the flange 5, and the part below the flange 5 is the main template 1, so that the top connecting template 7 can be fully and tightly contacted with a roadway roof after the flexible template is filled with materials, and the problem of tight top connection under the condition of uneven roadway roof is solved.
Referring to fig. 4, in the stirrup flexible formwork of the present invention, the flexible formwork has a hexagonal structure, and a plurality of tie bars 3 are respectively disposed between two opposite sides and/or between every two adjacent sides of the flexible formwork, so as to further prevent the flexible formwork from being deformed.
As shown in fig. 4, in the stirrup flexible formwork of the present invention, as a preferential connection method of the stirrup 3, both ends of the stirrup 3 are connected to the flexible formwork through the stirrup rings 10, respectively.
The adjacent side parts of the flexible template are connected together by part of lacing wires 3, so that the flexible template can be prevented from being transversely deformed; the two opposite sides of the flexible template are connected together by part of the tie bars 3, which prevent longitudinal deformation.
As shown in fig. 1, in the stirrup flexible template of the present invention, at least one sleeve 6 is provided on the flange 5, a reinforcing bar is inserted into each sleeve 6, the flange is fixed after the reinforcing bar is fixed, and the fixation of the stirrup flexible template is completed.
The stirrup flexible template disclosed by the invention has the advantages of simple overall structure, convenience in installation, lower manufacturing cost and good market application prospect.
When the stirrup flexible template is used, the stirrup flexible template comprises: a plurality of stirrup flexible templates are placed between a roadway top plate and a roadway bottom plate along the gob-side entry retaining, and every two stirrup flexible templates are tightly close together; carrying out gangue blocking support on the goaf side by using a wood point column or a wood pile or a single hydraulic prop or a gangue blocking support hanging net; then, penetrating steel bars into a sleeve 6 of the flange 5, hanging the flange 5 with the steel bars on a wood point column or a wood pile or a single hydraulic prop column head or a gangue blocking support which are already supported in a goaf, binding firmly, and enabling one side of the flexible template provided with the reserved opening 4 to face into a roadway and the side, opposite to the reserved opening 4, of the flexible template to face to the goaf side; installing gas drainage pipes, nitrogen injection pipes, grouting pipes, drain pipes or monitoring pipe pipelines on the reserved holes 8, and connecting the pipelines with branch pipelines reserved in the roadway in advance; and connecting a filling pipe to the reserved opening 4, and filling the flexible template with filling materials.
Claims (5)
1. The stirrup flexible template is characterized by comprising a closed flexible template, wherein at least one reserved opening (4), at least one first stirrup (2) and a plurality of flanges (5) are arranged on the flexible template, and a plurality of lacing wires (3) are arranged in the flexible template; the first stirrup (2) is arranged inside and/or outside the flexible template; the first stirrup (2) is fixed on the flexible template through a lacing wire ring (10); the surface of the flexible template is provided with a plurality of preformed holes (8), and a fiber cloth cylinder (9) connected with the preformed holes is arranged between the two corresponding preformed holes (8); each reserved opening (4) is provided with a fiber cloth cylinder (9); second stirrups (11) are arranged in the fiber cloth barrels between the two corresponding preformed holes (8), and two ends of each second stirrup (11) are connected with the corresponding first stirrups (2).
2. The stirrup flexible formwork as set forth in claim 1, wherein the flange (5) is located below the top of the flexible formwork, the flange (5) is the top formwork (7) of the flexible formwork, and the lower part of the flange (5) is the main body formwork (1) of the flexible formwork.
3. The stirrup flexible formwork according to claim 2, wherein the flexible formwork is of a hexagonal structure, and a plurality of the lacing wires (3) are respectively arranged between two opposite sides and/or between every two adjacent sides of the flexible formwork.
4. A stirrup flexible formwork as set forth in claim 3, characterized in that the two ends of the stirrup (3) are connected to the flexible formwork by means of a stirrup ring (10), respectively.
5. Stirrup flexible formwork according to claim 4, characterized in that said flange (5) is provided with at least one sleeve (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910636903.1A CN110332009B (en) | 2019-07-15 | 2019-07-15 | Flexible formwork for stirrups |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910636903.1A CN110332009B (en) | 2019-07-15 | 2019-07-15 | Flexible formwork for stirrups |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110332009A CN110332009A (en) | 2019-10-15 |
| CN110332009B true CN110332009B (en) | 2024-05-10 |
Family
ID=68144992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910636903.1A Active CN110332009B (en) | 2019-07-15 | 2019-07-15 | Flexible formwork for stirrups |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110332009B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113217093B (en) * | 2021-06-21 | 2024-04-16 | 扬州中矿建筑新材料科技有限公司 | Foldable framework film bag filling wall/body for gob-side entry retaining and construction method |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU5279186A (en) * | 1985-01-29 | 1986-08-07 | Alethea Rosalind Melanie Hall | Support member |
| GB8904255D0 (en) * | 1988-02-26 | 1989-04-12 | Neuero Stahlbau Gmbh & Co | Support system |
| FR2880380A1 (en) * | 2004-12-30 | 2006-07-07 | Robert Parra | Formwork device for forming concrete wall in e.g. tunnel, has head guards occupying part of space created by concrete stop masks, while closing confining volume transversally to extension or hollowing out direction |
| CN201486566U (en) * | 2009-08-27 | 2010-05-26 | 王晓利 | Device for pouring concrete continuous wall through gob-side entry retaining of mining working surface |
| CN101929342A (en) * | 2010-09-29 | 2010-12-29 | 西安科技大学 | Gob-side entry retaining concrete partition wall construction mold bag and construction method thereof |
| CN105201529A (en) * | 2015-09-22 | 2015-12-30 | 陕西开拓建筑科技有限公司 | Gob-side-entry-retaining transverse-slant-dual-pulling fiber flexible template and filling method thereof |
| CN205349415U (en) * | 2016-01-21 | 2016-06-29 | 山东科技大学 | Self -adaptation template for gob entry |
| CN205677664U (en) * | 2016-06-16 | 2016-11-09 | 山西潞安环保能源开发股份有限公司 | A kind of Flexible formwork assembly bracing means |
| CN106894829A (en) * | 2017-05-04 | 2017-06-27 | 重庆工程职业技术学院 | A kind of colliery roadside support structure and its construction technology |
| CN206280102U (en) * | 2016-12-09 | 2017-06-27 | 李柱和 | A kind of colliery anchor beam armored concrete fills mould bag |
| CN107013229A (en) * | 2017-05-26 | 2017-08-04 | 新疆大学 | Folding telescopic gob side entry retaining roadside packing Flexible formwork assembly and its construction method |
| CN206942790U (en) * | 2017-07-28 | 2018-01-30 | 浩珂科技有限公司 | A kind of underground mine use fill mould bag |
| CN210714777U (en) * | 2019-07-15 | 2020-06-09 | 陕西开拓建筑科技有限公司 | Hooping flexible template |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITBO20130089A1 (en) * | 2013-02-28 | 2014-08-29 | Elas Geotecnica Srl | REINFORCEMENT, STRUCTURE AND PROCEDURE FOR UNDERGROUND CONSTRUCTION OF REINFORCED CONCRETE |
-
2019
- 2019-07-15 CN CN201910636903.1A patent/CN110332009B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU5279186A (en) * | 1985-01-29 | 1986-08-07 | Alethea Rosalind Melanie Hall | Support member |
| GB8904255D0 (en) * | 1988-02-26 | 1989-04-12 | Neuero Stahlbau Gmbh & Co | Support system |
| FR2880380A1 (en) * | 2004-12-30 | 2006-07-07 | Robert Parra | Formwork device for forming concrete wall in e.g. tunnel, has head guards occupying part of space created by concrete stop masks, while closing confining volume transversally to extension or hollowing out direction |
| CN201486566U (en) * | 2009-08-27 | 2010-05-26 | 王晓利 | Device for pouring concrete continuous wall through gob-side entry retaining of mining working surface |
| CN101929342A (en) * | 2010-09-29 | 2010-12-29 | 西安科技大学 | Gob-side entry retaining concrete partition wall construction mold bag and construction method thereof |
| CN105201529A (en) * | 2015-09-22 | 2015-12-30 | 陕西开拓建筑科技有限公司 | Gob-side-entry-retaining transverse-slant-dual-pulling fiber flexible template and filling method thereof |
| CN205349415U (en) * | 2016-01-21 | 2016-06-29 | 山东科技大学 | Self -adaptation template for gob entry |
| CN205677664U (en) * | 2016-06-16 | 2016-11-09 | 山西潞安环保能源开发股份有限公司 | A kind of Flexible formwork assembly bracing means |
| CN206280102U (en) * | 2016-12-09 | 2017-06-27 | 李柱和 | A kind of colliery anchor beam armored concrete fills mould bag |
| CN106894829A (en) * | 2017-05-04 | 2017-06-27 | 重庆工程职业技术学院 | A kind of colliery roadside support structure and its construction technology |
| CN107013229A (en) * | 2017-05-26 | 2017-08-04 | 新疆大学 | Folding telescopic gob side entry retaining roadside packing Flexible formwork assembly and its construction method |
| CN206942790U (en) * | 2017-07-28 | 2018-01-30 | 浩珂科技有限公司 | A kind of underground mine use fill mould bag |
| CN210714777U (en) * | 2019-07-15 | 2020-06-09 | 陕西开拓建筑科技有限公司 | Hooping flexible template |
Non-Patent Citations (2)
| Title |
|---|
| 柔性模板泵注混凝土在沿空留巷支护中的应用;周金城;;煤炭科学技术;20120315(S1);36-39 * |
| 柔模泵注混凝土支护的沿空留巷技术研究;李宇龙;;陕西煤炭(02);11-14+51 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110332009A (en) | 2019-10-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205422813U (en) | Detachable filling and retaining wall | |
| CN109372556B (en) | Sandwich arch suitable for high-stress soft rock tunnel surrounding rock support and construction method | |
| WO2020253001A1 (en) | Two-step fast closed tunnel support structure having inverted arch and construction method therefor | |
| CN109026099B (en) | Soft rock roadway full-length anchoring supporting structure and construction method thereof | |
| CN103410161B (en) | Oblique control slip casting steel anchor tube framework and construction method thereof | |
| CN103147793B (en) | Girdle roadside packing non chain pillar entryprotection method | |
| CN204609900U (en) | A kind of corrugated steel preliminary bracing structure being applicable to benching tunnelling method excavation | |
| CN104790393A (en) | Double-anchoring-section prestress anchor cable structure and constructing method thereof | |
| CN108930543A (en) | A kind of big cross section gob side entry driving coupling supporting structure and construction method | |
| CN106498950A (en) | Anchor head is placed in the Pile-Anchor Supporting for Deep Excavation system and its implementation of pile body | |
| CN205712590U (en) | A kind of fabricated shear wall and the attachment structure of Prefabricated concrete-filled steel tube post | |
| CN110985066A (en) | Tunnel grouting support method and structure | |
| CN110645018B (en) | Mine underground strong dynamic pressure roadway prestress anchor-charging integrated supporting structure and method | |
| CN110332009B (en) | Flexible formwork for stirrups | |
| CN101082281A (en) | Method for controlling deformation of surrounding rocks of gallery influenced by overhead mining | |
| CN105862912B (en) | A kind of agent on crack resistance of concrete sliding pile panelling construction method | |
| CN205689216U (en) | A kind of reinforced combined retaining structure of pipe-plate lining | |
| CN109083660B (en) | Soft rock roadway or tunnel bottom heave treatment supporting structure and method based on reinforced concrete bottom beam | |
| CN210948737U (en) | Efficient and rapid tunneling roadway support facility for inclined small-section half-coal-rock roadway with thin coal seam | |
| CN105201529B (en) | Double tow ties up Flexible formwork assembly and its placement methods to a kind of gob side entry retaining crosswise | |
| CN107542086B (en) | Anchor cable construction method for filling slope | |
| CN210714777U (en) | Hooping flexible template | |
| CN217327329U (en) | Tunnel supporting construction is striden to super large | |
| CN112901226A (en) | Ultra-thin roof roadway supporting method under goaf | |
| CN103557007B (en) | Cross the construction method of geological anomaly zone soft-rock tunnel smashed to pieces |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |