CN113153353A - Roadway support structure in weak rock stratum and support method - Google Patents
Roadway support structure in weak rock stratum and support method Download PDFInfo
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- CN113153353A CN113153353A CN202110404100.0A CN202110404100A CN113153353A CN 113153353 A CN113153353 A CN 113153353A CN 202110404100 A CN202110404100 A CN 202110404100A CN 113153353 A CN113153353 A CN 113153353A
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- 239000011435 rock Substances 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000005065 mining Methods 0.000 claims abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 230000015572 biosynthetic process Effects 0.000 claims description 8
- 239000004567 concrete Substances 0.000 claims description 5
- 239000004677 Nylon Substances 0.000 claims description 4
- 239000000945 filler Substances 0.000 claims description 4
- 229920001778 nylon Polymers 0.000 claims description 4
- 239000011150 reinforced concrete Substances 0.000 claims description 4
- 239000002023 wood Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 description 7
- 230000006378 damage Effects 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D11/02—Lining predominantly with wood
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 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
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/152—Laggings made of grids or nettings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
Abstract
The invention provides a roadway supporting structure and a supporting method in a weak rock stratum, relates to the technical field of roadway supporting, and is designed for solving the problem that a roadway in the weak rock stratum is easy to deform. The roadway supporting structure in the weak rock stratum comprises a primary supporting structure, a secondary supporting structure and a flexible filling layer, wherein the primary supporting structure is a flexible supporting structure, and the primary supporting structure is directly supported on a naked roadway; the secondary supporting structures are rigid supporting structures and are multiple in number, the multiple groups of secondary supporting structures are closely arranged along the mining direction, and any two adjacent groups of secondary supporting structures are detachably and fixedly connected; each group of secondary supporting structures comprises a plurality of brickworks which are detachably and fixedly connected in a closed annular manner; the flexible filling layer is arranged between the primary supporting structure and the secondary supporting structure. The method can solve the problem that the roadway in the weak rock stratum is easy to deform.
Description
Technical Field
The invention relates to the technical field of roadway support, in particular to a roadway support structure in a weak rock stratum and a support method.
Background
When the coal mine tunnel is arranged in a weak rock stratum, the weak rock stratum has the characteristics of low strength, easiness in water absorption and expansion, large nonlinear deformation and the like, so that the problems of serious bottom heave, convergence of two sides and the like of the constructed tunnel are easily caused, the effective section of the tunnel is reduced, the repair work amount is increased, the repair cost is increased, and the use of the normal function of the tunnel is influenced.
Disclosure of Invention
The invention aims to provide a roadway support structure in a weak rock stratum so as to solve the technical problem that the roadway in the weak rock stratum is easy to deform.
The invention provides a roadway supporting structure in a weak rock stratum, which comprises a primary supporting structure, a secondary supporting structure and a flexible filling layer.
The primary supporting structure is a flexible supporting structure, and the primary supporting structure is directly supported on a naked roadway.
The secondary supporting structures are rigid supporting structures and are arranged in multiple groups, the multiple groups of secondary supporting structures are closely arranged along the mining direction, and any two adjacent groups of secondary supporting structures can be detachably and fixedly connected; every group secondary supporting construction includes a plurality of brickworks, and is a plurality of the brickworks are closed annular ground and can dismantle fixed connection.
The flexible filling layer is arranged between the primary supporting structure and the secondary supporting structure.
Further, any two adjacent groups of secondary supporting structures are detachably and fixedly connected through a first threaded connection assembly.
Furthermore, in each group of secondary supporting structure, any two adjacent brickworks are detachably and fixedly connected through a second threaded connection assembly.
Further, a first rubber layer is arranged between any two adjacent groups of secondary supporting structures; in each group of secondary supporting structures, a second rubber layer is arranged between any two adjacent brickworks.
Further, the masonry is made of concrete and/or reinforced concrete.
Further, the flexible infill layer comprises a wood and/or nylon mesh.
Further, the secondary supporting structure is in a similar round shape.
Further, the primary supporting structure comprises a steel wire mesh and an anchor rod, the steel wire mesh is laid along the surface of the naked roadway, and the anchor rod penetrates through the steel wire mesh and is anchored in a rock stratum.
The roadway supporting structure in the weak rock stratum has the advantages that:
the method comprises the steps that a roadway supporting structure in a weak rock stratum mainly comprising a primary supporting structure, a secondary supporting structure and a flexible filling layer is arranged, wherein the primary supporting structure is a flexible supporting structure and is directly supported on a naked roadway; the secondary supporting structures are rigid supporting structures and are multiple in number, the multiple groups of secondary supporting structures are closely arranged along the mining direction, and any two adjacent groups of secondary supporting structures are detachably and fixedly connected; each group of secondary supporting structures comprises a plurality of brickworks which are detachably and fixedly connected in a closed annular manner; the flexible filling layer is arranged between the first supporting structure and the second supporting structure.
This weak rock stratum intraformational roadway support structure directly struts the naked body tunnel through setting up flexible primary support structure, the stability in naked body tunnel has been maintained effectively, and the wholeness of country rock has been guaranteed, through setting up the secondary support structure of rigidity, make this weak rock stratum intraformational roadway support structure can effectively resist tunnel creep, and, through set up flexible filling layer between primary support structure and secondary support structure, the equal year of effort has been realized, make the pressure by primary support structure transmission can evenly act on secondary support structure, thereby the destruction that secondary support structure leads to because of local stress concentration has been reduced effectively, secondary support structure's life has been prolonged, and then guaranteed this weak rock stratum intraformational roadway support structure reliability of strutting.
Therefore, the soft-rigid composite supporting form of the supporting structure of the roadway in the weak rock stratum achieves the purpose of resisting the deformation of the weak rock stratum, thereby solving the technical problem that the roadway in the weak rock stratum is easy to deform in the prior art.
In addition, when the working face is mined, the secondary supporting structure can be dismantled in advance within the range of the forepoling section, and only the primary supporting structure is reserved. So set up for secondary supporting construction can cyclic utilization, has practiced thrift the cost of strutting. Moreover, each masonry in each group of secondary supporting structures is removed one by one, so that the removal of a group of secondary supporting structures is realized, the operation of workers is facilitated, and the operation efficiency is improved.
The second purpose of the invention is to provide a roadway support method in the weak rock stratum, so as to solve the technical problem that the roadway in the weak rock stratum is easy to deform.
The invention provides a roadway support method in a weak rock stratum, which adopts the roadway support structure in the weak rock stratum to support a naked roadway and comprises the following steps: after a weak rock stratum is tunneled into a naked roadway, directly supporting the naked roadway by adopting a primary supporting structure; on the basis of the primary supporting structure, a secondary supporting structure is adopted for supporting, and a flexible filling layer is arranged between the primary supporting structure and the secondary supporting structure.
Further, the method also comprises the following steps: when the working face is mined, the secondary supporting structure is dismantled in advance within the range of the advance supporting section, and only the primary supporting structure is reserved; and (5) recycling the secondary supporting structure.
The roadway support method in the weak rock stratum has the advantages that:
the roadway supporting method in the weak rock stratum is used for supporting a naked roadway by adopting the roadway supporting structure in the weak rock stratum, and accordingly, the roadway supporting method in the weak rock stratum has all the advantages of the roadway supporting structure in the weak rock stratum, and the detailed description is omitted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a cross-sectional view of a roadway support structure in a weak rock stratum according to an embodiment of the present invention supported in a bare roadway;
fig. 2 is a schematic block connection diagram of a roadway support structure in a weak rock stratum according to an embodiment of the present invention;
fig. 3 is a plan view of a roadway support structure in a weak rock stratum according to an embodiment of the present invention when the roadway support structure is supported in a bare roadway.
Description of reference numerals:
010-advance support section; 020-normal support section; 030-stope face;
100-naked laneway; 200-primary supporting structure; 300-secondary supporting structure; 400-a flexible filler layer; 500-a first rubber layer; 600-a first threaded connection assembly;
210-steel wire mesh; 220-anchor rod;
310-masonry; 320-a second threaded connection assembly; 330-a second rubber layer;
311-second connection hole; 312-reinforcing steel bars; 313 — first connection hole.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 is a cross-sectional view of the weak rock strata roadway support structure provided in this embodiment when supported in a bare roadway 100, fig. 2 is a schematic connection diagram of masonry 310 of the weak rock strata roadway support structure provided in this embodiment, and fig. 3 is a plan view of the weak rock strata roadway support structure provided in this embodiment when supported in the bare roadway 100. As shown in fig. 1 to 3, the present embodiment provides a roadway supporting structure in a weak rock stratum, including a primary supporting structure 200, a secondary supporting structure 300 and a flexible filling layer 400, wherein the primary supporting structure 200 is a flexible supporting structure, and the primary supporting structure 200 is directly supported on a bare roadway 100; the secondary supporting structures 300 are rigid supporting structures and are in multiple groups, the multiple groups of secondary supporting structures 300 are closely arranged along the mining direction, and any two adjacent groups of secondary supporting structures 300 are detachably and fixedly connected; each group of secondary supporting structures 300 comprises a plurality of brickworks 310, and the plurality of brickworks 310 are detachably and fixedly connected in a closed ring shape; the flexible filling layer 400 is disposed between the primary supporting structure 200 and the secondary supporting structure 300.
This weak rock stratum intraformational roadway support structure directly supports naked body tunnel 100 through setting up flexible primary support structure 200, the stability of naked body tunnel 100 has been maintained effectively, and the wholeness of country rock has been guaranteed, through setting up rigid secondary support structure 300, make this weak rock stratum intraformational roadway support structure can effectively resist tunnel creep, and, through set up flexible filling layer 400 between primary support structure 200 and secondary support structure 300, the equal year of effort has been realized, make the pressure that is transmitted by primary support structure 200 can act on secondary support structure 300 uniformly, thereby secondary support structure 300 has been reduced effectively because of the destruction that local stress concentrates and lead to, secondary support structure 300's life has been prolonged, and then guaranteed this weak rock stratum intraformational roadway support structure and carried out the reliability of strutting.
Therefore, the soft-rigid composite supporting form of the supporting structure of the roadway in the weak rock stratum achieves the purpose of resisting the deformation of the weak rock stratum, thereby solving the technical problem that the roadway in the weak rock stratum is easy to deform in the prior art.
Furthermore, when working face extraction, within the reach of the forepoling section 010, the secondary shoring structure 300 can be dismantled in advance, leaving only the primary shoring structure 200. So set up for secondary supporting construction 300 can cyclic utilization, has practiced thrift the cost of strutting. Moreover, each masonry 310 in each group of secondary supporting structures 300 is removed one by one, so that the removal of one group of secondary supporting structures 300 is realized, the operation of workers is facilitated, and the operation efficiency is improved.
With continued reference to fig. 2 and 3, in the present embodiment, any two adjacent sets of secondary supporting structures 300 are detachably and fixedly connected by a first threaded connection assembly 600. The form of fixedly connecting the two adjacent groups of secondary supporting structures 300 by using the first threaded connection assembly 600 is reliable in connection, so that the supporting reliability is ensured.
It should be noted that the range of the normal supporting section 020 is still a "soft-rigid" composite supporting structure formed by the primary supporting structure 200 and the secondary supporting structure 300.
With reference to fig. 2, specifically, two edges of the masonry 310 along the recovery direction are provided with first connection holes 313, and the first connection holes 313 of any two adjacent masonry 310 are opposite to each other, the first threaded connection assembly 600 includes a first screw and two first nuts, wherein two ends of the first screw respectively extend out from the two adjacent first connection holes 313, and the two first nuts are respectively screwed to two ends of the first screw extending out of the first connection holes 313 and abut against hole walls of the first connection holes 313.
Referring to fig. 2, in the present embodiment, a first rubber layer 500 is disposed between any two adjacent sets of secondary supporting structures 300.
By arranging the first rubber layer 500 between any two adjacent groups of secondary supporting structures 300, not only is the sealing of the gap between the two groups of secondary supporting structures 300 realized, but also a certain buffering effect is achieved, the impact influence between any two adjacent groups of secondary supporting structures 300 is reduced, and the service life of the secondary supporting structures 300 is prolonged.
With continued reference to fig. 1 and 2, in the present embodiment, in each set of secondary supporting structures 300, any two adjacent brickworks 310 are detachably and fixedly connected by a second threaded connection component 320. So set up, guaranteed the reliability that two adjacent brickworks 310 are connected to guarantee secondary supporting construction 300's support reliability.
With reference to fig. 1 and fig. 2, specifically, two edges of the masonry 310 along the circumferential direction of the secondary supporting structure 300 are provided with second connection holes 311, and the second connection holes 311 of any two adjacent masonry 310 are opposite to each other, and the second threaded connection component 320 includes a second screw and two second nuts, wherein two ends of the second screw respectively extend out from the two adjacent second connection holes 311, and the two second nuts are respectively screwed to two ends of the second screw extending out of the second connection holes 311 and tightly abut against hole walls of the second connection holes 311.
Referring to fig. 2, in the present embodiment, in each set of secondary supporting structures 300, a second rubber layer 330 is disposed between any two adjacent brickworks 310.
So set up, not only realized in every group secondary supporting construction 300 arbitrary adjacent two brickworks 310 between sealed, moreover, still played certain cushioning effect, reduced brickworks 310 and received the probability of destruction, prolonged brickworks 310's life-span.
Specifically, the masonry 310 may be made of concrete. So set up, not only can guarantee secondary supporting construction 300's support reliability, moreover, the cost is lower.
In other embodiments, the masonry 310 may be made of reinforced concrete, and specifically, as shown in fig. 1, the concrete masonry 310 is provided with steel bars 312. So set up, can improve brickwork 310's structural strength, further improve secondary supporting construction 300's support reliability.
Of course, each set of secondary support structure 300 may have both masonry 310 made of concrete and masonry 310 made of reinforced concrete.
Specifically, in this embodiment, the flexible filling layer 400 may be wood, or the flexible filling layer 400 may be a nylon net, or the flexible filling layer 400 is a mixture of wood and nylon net.
With such an arrangement, on the one hand, the pressure transmitted by the primary supporting structure 200 can uniformly act on the surface of the secondary supporting structure 300, so as to reduce the probability of damage to the secondary supporting structure 300 due to local stress concentration, and on the other hand, the arrangement of the flexible filling layer 400 has wide sources and low cost.
Referring to fig. 1, in the present embodiment, the secondary supporting structure 300 is shaped like a circle. By such an arrangement, the stress concentration of the secondary supporting structure 300 can be reduced, so that the deformation resistance of the secondary supporting structure 300 is increased, and the supporting reliability is further improved.
Referring to fig. 1, in the present embodiment, the bottom of the secondary supporting structure 300 is semi-circular arch, wherein the arch direction of the semi-circular arch is downward. So set up, can resist tunnel pucking deformation.
With continued reference to fig. 1 and 3, in the present embodiment, the primary supporting structure 200 may include a steel wire mesh 210 and an anchor rod 220, the steel wire mesh 210 is laid along the surface of the open-faced roadway 100, and the anchor rod 220 penetrates through the steel wire mesh 210 and is anchored in the rock formation.
The arrangement form of the primary supporting structure 200 is simple in structure and easy to arrange.
The embodiment also provides a roadway support method in the weak rock stratum, which adopts the roadway support structure in the weak rock stratum to support a naked roadway and comprises the following steps: after the weak rock stratum is tunneled into the naked roadway 100, a primary supporting structure 200 is adopted to directly support the naked roadway 100; on the basis of the primary supporting structure 200, the secondary supporting structure 300 is adopted for supporting, and a flexible filling layer 400 is arranged between the primary supporting structure 200 and the secondary supporting structure 300.
The roadway supporting method in the weak rock stratum is used for supporting a naked roadway by adopting the roadway supporting structure in the weak rock stratum, and accordingly, the roadway supporting method in the weak rock stratum has all the advantages of the roadway supporting structure in the weak rock stratum, and the detailed description is omitted.
Specifically, the roadway supporting method in the weak rock stratum further comprises the following steps: when the working face is recovered, the secondary supporting structure 300 is dismantled in advance within the range of the advance supporting section 010, and only the primary supporting structure 200 is reserved; secondary support structure 300 recycles.
The supporting structure of the roadway in the weak rock stratum is particularly suitable for a short-service-life stoping roadway, therefore, the secondary supporting structure 300 is formed by splicing detachable brickworks 310, has rigid supporting capacity, can be detached before a stope face 030 is stoped, only the primary supporting structure 200 is needed to maintain the stability of the roadway before the stope face is stoped for a short time, and the detached secondary supporting structure 300 can be repeatedly used, so that the supporting cost of the roadway in the weak rock stratum is greatly reduced.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the above embodiments, the descriptions of the orientations such as "up", "down", and the like are based on the drawings.
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 disclosed herein.
Claims (10)
1. The utility model provides a roadway support structure in weak stratum which characterized in that includes:
the primary supporting structure (200), the primary supporting structure (200) is a flexible supporting structure, and the primary supporting structure (200) is directly supported on the naked roadway (100);
the mining device comprises a plurality of groups of secondary supporting structures (300), wherein the secondary supporting structures (300) are rigid supporting structures, the plurality of groups of secondary supporting structures (300) are closely arranged along the mining direction, and any two adjacent groups of secondary supporting structures (300) are detachably and fixedly connected; each group of secondary supporting structures (300) comprises a plurality of brickworks (310), and the brickworks (310) are detachably and fixedly connected in a closed ring shape; and
a flexible filler layer (400), the flexible filler layer (400) being disposed between the primary supporting structure (200) and the secondary supporting structure (300).
2. The weak formation roadway support structure of claim 1, wherein any two adjacent groups of the secondary support structures (300) are detachably and fixedly connected through a first threaded connection assembly (600).
3. The weak formation roadway support structure of claim 2, wherein in each set of the secondary support structures (300), any two adjacent brickworks (310) are detachably and fixedly connected through a second threaded connection assembly (320).
4. The weak rock stratum intraroadway support structure according to claim 3, wherein a first rubber layer (500) is arranged between any two adjacent groups of the secondary support structures (300); in each group of secondary supporting structures (300), a second rubber layer (330) is arranged between any two adjacent brickworks (310).
5. The weak rock formation roadway support structure of any one of claims 1 to 4, wherein the masonry (310) is made of concrete and/or reinforced concrete.
6. The weak formation roadway support structure of any one of claims 1 to 4, wherein the flexible filler layer (400) comprises wood and/or nylon mesh.
7. The weak formation roadway support structure according to any one of claims 1 to 4, wherein the secondary support structure (300) is of a quasi-circular shape.
8. The weak intraformation roadway support structure of any one of claims 1 to 4, wherein the primary support structure (200) comprises a steel wire mesh (210) and a bolt (220), the steel wire mesh (210) is laid along the surface of the open-faced roadway (100), and the bolt (220) penetrates through the steel wire mesh (210) and is anchored in the rock formation.
9. A method for supporting a roadway in a weak rock stratum, which is characterized in that a naked roadway is supported by adopting the roadway supporting structure in the weak rock stratum of any one of claims 1 to 8, and comprises the following steps:
after a weak rock stratum is tunneled into a naked roadway (100), a primary supporting structure (200) is adopted to directly support the naked roadway (100);
on the basis of the primary supporting structure (200), a secondary supporting structure (300) is adopted for supporting, and a flexible filling layer (400) is arranged between the primary supporting structure (200) and the secondary supporting structure (300).
10. The method for supporting a roadway in a weak rock formation according to claim 9, further comprising the steps of: when the working face is mined, the secondary supporting structure (300) is dismantled in advance within the range of the forepoling section (010), and only the primary supporting structure (200) is reserved; and the secondary supporting structure (300) is recycled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110404100.0A CN113153353A (en) | 2021-04-15 | 2021-04-15 | Roadway support structure in weak rock stratum and support method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110404100.0A CN113153353A (en) | 2021-04-15 | 2021-04-15 | Roadway support structure in weak rock stratum and support method |
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| CN113153353A true CN113153353A (en) | 2021-07-23 |
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| CN202110404100.0A Pending CN113153353A (en) | 2021-04-15 | 2021-04-15 | Roadway support structure in weak rock stratum and support method |
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Application publication date: 20210723 |