CN115788498A - Mechanical tunneling and supporting method in filling body - Google Patents
Mechanical tunneling and supporting method in filling body Download PDFInfo
- Publication number
- CN115788498A CN115788498A CN202310048500.1A CN202310048500A CN115788498A CN 115788498 A CN115788498 A CN 115788498A CN 202310048500 A CN202310048500 A CN 202310048500A CN 115788498 A CN115788498 A CN 115788498A
- Authority
- CN
- China
- Prior art keywords
- roadway
- anchor rod
- tunneling
- anchoring
- concrete
- 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.)
- Granted
Links
Images
Abstract
The invention provides a mechanical tunneling and supporting method in a filling body, which relates to the technical field of mining and comprises the following steps: tunneling the filling body by mechanical rock breaking tunneling equipment to form a roadway; carrying out sprayed concrete support on the roadway; anchoring and supporting the roadway sprayed with the concrete; through the anchor is strutted, makes to strut more stably, reduces the unstable risk in later stage, can avoid the risk that constructor long-term construction exists after spraying the concrete, reduces the potential safety hazard, has alleviated the work progress danger that exists among the prior art and the later stage appears the caving easily, has the technical problem of potential safety hazard, has reached the risk that reduces in the work progress, avoids the technological effect that the later stage collapsed simultaneously.
Description
Technical Field
The invention relates to the technical field of mining, in particular to a mechanical tunneling and supporting method in a filling body.
Background
At present, the underground usually has a plurality of ore veins, and in order to facilitate ore transportation in mining, a vein-through channel communicated with an upper tray and a lower tray is generally arranged in a specific area, and the channel can be arranged in a safe ore pillar or a mined-out area after mining. If the connecting channel is arranged in the safe ore pillar, the ore pillar cannot be mined to ensure the stability and the safety. In order to facilitate the recovery of ore resources, a method of arranging a drift-through roadway in a goaf after the mining of an ore body is common. If the blasting method is adopted for mining, blasting shock waves generated when the blasting method is used for mining the drift-through roadway can not only damage the surface of the filling body, but also damage the interior of the filling body, and the blasting shock waves can seriously damage the integrity of the filling body, so that the difficulty is brought to the selection of a subsequent supporting mode and the safety of supporting.
In the prior art, a channel is generally constructed in a goaf in advance by using a steel structure and concrete, a constructor needs to enter the goaf to construct, a steel structure framework is abutted in the channel and concrete is poured, and filling is carried out after concrete curing is finished.
However, the pre-constructed roadway is threatened by rocks which may fall from the top and the side walls of the goaf in the process of constructing the pre-constructed roadway, so that the long-term construction of constructors is dangerous, and the pre-constructed roadway is threatened by rocks which may fall from the top and the side walls of the goaf, and needs to bear the impact stress and the self-weight stress of a filling body to the pre-constructed roadway, so that potential safety hazards exist.
Disclosure of Invention
The invention aims to provide a mechanical tunneling and supporting method in a filling body, which is used for relieving the technical problems of construction process danger, easy falling-off in the later period and potential safety hazard in the prior art.
The invention provides a mechanical tunneling and supporting method in a filling body, which comprises the following steps:
tunneling the filling body by mechanical rock breaking tunneling equipment to form a roadway;
carrying out sprayed concrete support on the roadway;
and (5) performing anchoring support on the roadway sprayed with the concrete.
In an alternative embodiment, the step of bolting comprises:
and anchoring the sprayed roadway by using an anchor rod.
In an alternative embodiment, the bolt comprises a tube seam bolt, the step of anchoring the tube seam bolt comprising:
the method comprises the following steps of (1) driving a pipe seam anchor rod into a roadway section to be divided into a primary anchoring section and a secondary anchoring section;
compressing the pipe seam anchor rod, and then driving the primary anchoring section into the roadway;
and releasing the compression of the pipe seam anchor rod, and then driving the residual secondary anchoring section into the roadway.
In an alternative embodiment, the primary anchoring section occupies four fifths of the driven roadway section and the secondary anchoring section occupies one fifth of the driven roadway section.
In an optional embodiment, the step of performing shotcrete support on the roadway includes:
and spraying fiber concrete with the thickness of at least 30mm to the roadway, wherein the strength of the fiber concrete is at least C20, and maintaining after spraying.
In an alternative embodiment, the method further comprises the following steps:
and (5) secondarily spraying concrete to the anchored and supported roadway.
In an alternative embodiment, the step of anchoring the bolt further comprises:
the anchor rod comprises an expansion pipe anchor rod, the expansion pipe anchor rod is adopted for anchoring in the roadway after injection, and the expansion pipe anchor rod expands after extending into the roadway.
The invention provides a mechanical tunneling and supporting method in a filling body, which comprises the following steps: tunneling the filling body by mechanical rock breaking tunneling equipment to form a roadway; carrying out sprayed concrete support on the roadway; anchoring and supporting the roadway sprayed with the concrete; through the anchor is strutted, make to strut more stably, reduce the risk that the later stage drops, can avoid the risk that constructor long-term construction exists after spraying the concrete, reduce the potential safety hazard, alleviate the work progress danger that exists among the prior art and the later stage appears the caving easily, have the technical problem of potential safety hazard, reached the risk that reduces in the work progress, avoid the technological effect that the later stage collapsed simultaneously.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a cross-sectional view of a mechanical tunneling and supporting method in a filling body according to an embodiment of the invention;
FIG. 2 is a top view of a method for mechanically tunneling and supporting a filling body according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an anchor rod of the mechanical tunneling and supporting method in a filling body according to the embodiment of the invention;
FIG. 4 is a schematic structural diagram of an expansion assembly of the method for mechanically tunneling and supporting in a filling body according to the embodiment of the invention;
fig. 5 is a schematic structural diagram of the anchor rod and the expansion assembly of the method for mechanically tunneling and supporting in a filling body according to the embodiment of the invention.
Icon: 1-laneway; 2-anchor rod; 3-concrete; 4-mechanical rock breaking and tunneling equipment; 5-an expansion assembly; 6-outer tube; 7-inner core.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "suspended" and the like do not imply that the components are absolutely horizontal or suspended, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
As shown in fig. 1 to 5, the method for mechanically tunneling and supporting in a filling body provided by the embodiment of the invention comprises the following steps: the mechanical rock breaking and tunneling equipment 4 tunnels the filling body to form a roadway 1; carrying out shotcrete 3 support on the roadway 1; and (5) performing anchoring support on the roadway 1 after the concrete 3 is sprayed.
In this embodiment, the mechanical rock breaking and tunneling device 4 may be a tunneling machine, a channel formed after the mechanical rock breaking and tunneling device 4 tunnels is a roadway 1, the roadway 1 extends in a horizontal direction or is obliquely arranged, in the supporting process, the inner wall of the roadway 1 is sprayed with concrete 3 first, wherein the thickness of the sprayed concrete 3 is not less than 30mm, the strength of the concrete 3 is not less than C20, the spraying positions may be the top, the side wall and the bottom of the roadway 1, and after the concrete 3 is sprayed for the first time, the inner wall of the roadway 1 is anchored and supported, so that the roadway 1 is prevented from collapsing, risks in the construction process are reduced, and roadway collapse in the later period is avoided.
The mechanical tunneling and supporting method in the filling body provided by the embodiment of the invention comprises the following steps: the mechanical rock breaking and tunneling equipment 4 tunnels the filling body to form a roadway 1; carrying out shotcrete 3 support on the roadway 1; anchoring and supporting the roadway 1 after the concrete 3 is sprayed; through the anchor is strutted, makes to strut more stably, reduces the risk that collapses, can avoid constructor's risk of long-term construction after spraying concrete 3, reduces the potential safety hazard, has alleviated the work progress danger that exists among the prior art and the later stage drops easily, has the technical problem of potential safety hazard, has reached the risk that reduces in the work progress, avoids the technological effect that the later stage collapses simultaneously.
In an alternative embodiment, the step of bolting includes: after the concrete 3 is sprayed, the anchoring is carried out in the roadway 1 by anchor rods 2.
In this embodiment, stock 2 is long and thin form, behind injection concrete 3, covers the net piece on concrete 3 to squeeze into stock 2, the afterbody and the anchor net piece of the stock 2 after squeezing into are connected, through 1 fixed stock 2 in tunnel, and fix tunnel 1 through stock 2 and net piece and do not sink, and fixed concrete 3 does not drop simultaneously.
Optionally, the anchor rods 2 are provided in a plurality, the vertical planes in the tunneling direction of the mechanical rock breaking tunneling equipment 4 serve as a group, each group is provided with a plurality of anchor rods 2, the anchor rods 2 are evenly arranged along the inner wall of the roadway 1 at intervals, the distance between every two adjacent anchor rods 2 is not greater than 3m, the anchor rods 2 are arranged along the tunneling direction of the mechanical rock breaking tunneling equipment 4 at intervals, and the distance between every two adjacent anchor rods 2 is not greater than 4m.
In an alternative embodiment, the step of anchoring the bolt 2 comprises: and anchoring the sprayed roadway 1 by using a pipe seam anchor rod 2, and enabling the pipe seam anchor rod 2 to be higher than the sprayed concrete 3 after anchoring.
In the embodiment, after the concrete 3 is sprayed in the roadway 1, the pipe seam anchor rod 2 is driven into the roadway 1, the height of the end surface of the pipe seam anchor rod 2 after the driving is finished is higher than that of the sprayed concrete 3, and the pipe seam anchor rod 2 is connected with the mesh sheet through the end surface of the pipe seam anchor rod 2, wherein the length of the pipe seam anchor rod 2 is at least 1m.
In an alternative embodiment, the step of anchoring the tubular seam anchor 2 comprises: driving the pipe seam anchor rod 2 into a primary anchoring section and a secondary anchoring section of the roadway 1; after the pipe seam anchor rod 2 is compressed, the primary anchoring section is driven into the roadway 1; and releasing the compression of the pipe seam anchor rod 2, and then driving the residual secondary anchoring section into the roadway 1.
In this embodiment, 1 section is squeezed into except that the part that spills in pipe seam stock 2, and the one end that gets into tunnel 1 earlier is provided with preliminary anchor section, secondary anchor section sets up with preliminary anchor section is adjacent, in the in-service use process, pipe seam stock 2 is owing to be provided with the pipe seam that runs through along its length direction, so the diameter of pipe seam stock 2 can be compressed and change by external force, be provided with a spacing ring at the circular cone end before squeezing into, the internal diameter of spacing ring is less than the external diameter of pipe seam stock 2 under the release state, therefore the spacing ring can make pipe seam stock 2 compressed, squeeze into in tunnel 1 this moment in, until accomplishing preliminary anchor, in making pipe seam stock 2 can squeeze into tunnel 1 more easily, play the effect of preliminary location, then take off the spacing ring, make pipe seam stock 2 expand, and squeeze into remaining secondary anchor section under this state, through the anchor of two different diameters of pipe seam stock 2, make pipe seam stock 2 be connected with tunnel 1 inseparabler.
In an alternative embodiment, the primary anchoring section proportion is less than four fifths of the driving roadway 1 section, and the secondary anchoring section proportion is greater than one fifth of the driving roadway 1 section.
In this embodiment, preliminary anchor section accounts for four fifths of the driving into tunnel 1 section, makes the driving into process more smooth, and secondary anchor section accounts for one fifth of the driving into tunnel 1 section, makes stock 2 more stable after the secondary anchor.
In an alternative embodiment, the step of supporting the roadway 1 with the shotcrete 3 comprises: the fiber concrete 3 of at least 30mm thickness is sprayed to tunnel 1, and the intensity of fiber concrete 3 is C20 at least to carry out the maintenance after spraying, simultaneously, can carry out the secondary to tunnel 1 after the stock 2 anchor and spray fiber concrete 3 and handle.
In this embodiment, the concrete 3 with the strength of at least C20 can be used for both the primary sprayed concrete 3 and the secondary sprayed concrete 3, the spraying thickness of both the primary sprayed concrete and the secondary sprayed concrete can be at least 30mm, and the tunneling method in the filling body is completed by circulating tunneling and supporting to the roadway 1, or by synchronously tunneling and supporting to the roadway 1.
In an alternative embodiment, the step of the anchor rod 2 anchoring the mesh further comprises: and anchoring by adopting the expanded pipe anchor rod 2 in the roadway 1 after injection, wherein the expanded pipe anchor rod 2 expands after extending into the roadway 1, and the expanded pipe anchor rod 2 is higher than the injection concrete 3 after anchoring.
In this embodiment, the bloated pipe end of expand tube stock 2 contacts earlier in 1 tunnel and squeezes into 1 tunnel to make the terminal surface of tube seam stock 2 exceed the concrete 3 of first time injection after squeezing into, then can be connected the terminal surface and the net piece of tube seam stock 2, expand after 2 expand tube stock squeeze into 1 tunnel, make 2 more inseparable of expand tube stock and 1 tunnel connection.
In an alternative embodiment, the step of anchoring the expansion bolt 2 comprises: punching holes on the inner wall of the sprayed concrete 3 according to the length of the expansion anchor rod 2; arranging a tip of at least 0.2m at the front end of the expansion anchor rod 2, and extending the expansion anchor rod 2 into a drilled hole; the expansion assembly 5 extends into the expansion anchor rod 2 to expand and push the tip of the front end of the expansion anchor rod 2 to move towards the direction far away from the axis of the expansion anchor rod 2.
In this embodiment, the front end of expand tube stock 2 sets up to two at least triangle-shaped point ends, and evenly set up along the axis of expand tube stock 2, in the anchor process of expand tube stock 2, punch in the position of predetermineeing, the length that punches is 1cm less than the length of expand tube stock 2, then stretch into expand tube stock 2 from punching, treat the triangle-shaped of 2 front ends of expand tube stock and touch the end back, stretch into expansion assembly 5 to triangle-shaped point department in the expand tube stock 2, then start expansion assembly 5 and make its inflation, and with most advanced inner wall butt, make expansion assembly 5 promote most advanced expansion, in order to accomplish expand tube and anchor process, mode anchor through the expand tube, make stock 2 more stable.
In an alternative embodiment, the step of expanding the expansion assembly 5 into the expansion bolt 2 comprises: the expansion assembly 5 is contracted after completing the expansion and is withdrawn from the tube expansion anchor rod 2.
In this embodiment, the expansion assembly 5 can adopt an outer tube 6 and an inner core 7, the inner core 7 is arranged in the outer tube 6 and slides along the axis direction relative to the outer tube 6, the front end of the inner core 7 is provided with a vertical push plate, the outer tube 6 is provided with two triangles corresponding to the push plate, the push plate can push the two triangles to be away from each other, in the expansion process, the expansion assembly 5 extends into the expansion anchor rod 2, and after the two triangles correspond to the tip, the inner core 7 is pushed, so that the push plate is extruded with the two triangles, at the moment, the two triangles extrude the tip to expand the expansion anchor rod, the expansion purpose is achieved, the inner core 7 is pulled back after the expansion is finished, at the moment, the push plate is retracted, and the outer tube 6 is pulled to make the two triangles approach each other, so that the expansion assembly 5 can withdraw from the expansion anchor rod 2, the expansion assembly 5 can be repeatedly utilized, and the cost is saved.
In this embodiment, the mesh may be a reinforcing steel strip or a reinforcing steel mesh, and when a small area of the roadway 1 is to be supported, the reinforcing steel strip may be used, and when a large area of the roadway 1 is to be supported, the reinforcing steel mesh may be used, so that the support is more flexible, and the working hours and materials are saved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A mechanical tunneling and supporting method in a filling body is characterized by comprising the following steps:
tunneling the filling body by mechanical rock breaking tunneling equipment to form a roadway;
carrying out sprayed concrete support on the roadway;
and carrying out anchoring support on the roadway sprayed with the concrete.
2. The in-vivo mechanical tunneling and supporting method according to claim 1, wherein the step of bolting comprises:
and anchoring the sprayed roadway by using an anchor rod.
3. The in-vivo mechanical tunneling and supporting method according to claim 2, wherein the anchor rod comprises a tube seam anchor rod, and the step of anchoring the tube seam anchor rod comprises:
the method comprises the following steps of (1) dividing a pipe seam anchor rod driving roadway section into a primary anchoring section and a secondary anchoring section;
after the pipe seam anchor rod is compressed, driving the primary anchoring section into the roadway;
and releasing the compression of the pipe seam anchor rod, and then driving the rest secondary anchoring section into the roadway.
4. The in-pack mechanical tunneling and supporting method according to claim 3, wherein the primary anchoring section is less than four-fifths of the driving roadway section, and the secondary anchoring section is more than one-fifth of the driving roadway section.
5. The in-vivo mechanical excavation and support method according to any one of claims 1 to 4, wherein the step of performing shotcrete support on the roadway comprises:
and spraying fiber concrete with the thickness of at least 30mm to the roadway, wherein the strength of the fiber concrete is at least C20, and maintaining after spraying.
6. The in-vivo mechanical tunneling and supporting method according to claim 1, further comprising the steps of:
and (5) secondarily spraying concrete to the anchored and supported roadway.
7. The in-vivo mechanical tunneling and supporting method according to claim 2, wherein the anchor further comprises a tube expansion anchor, and the anchoring step of the tube expansion anchor comprises:
and adopting an expansion pipe anchor rod for anchoring in the sprayed roadway, wherein the expansion pipe anchor rod extends into the roadway and then expands.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310048500.1A CN115788498B (en) | 2023-01-31 | 2023-01-31 | Mechanical tunneling and supporting method in filling body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310048500.1A CN115788498B (en) | 2023-01-31 | 2023-01-31 | Mechanical tunneling and supporting method in filling body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115788498A true CN115788498A (en) | 2023-03-14 |
| CN115788498B CN115788498B (en) | 2023-05-16 |
Family
ID=85429398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310048500.1A Active CN115788498B (en) | 2023-01-31 | 2023-01-31 | Mechanical tunneling and supporting method in filling body |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115788498B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101906977A (en) * | 2010-07-21 | 2010-12-08 | 中国矿业大学(北京) | Method for preventing and treating large deformation and collapse of softrock tunnel |
| CN103195441A (en) * | 2013-04-01 | 2013-07-10 | 平顶山天安煤业股份有限公司 | Supporting and reinforcing structure of coal mine tunnel and construction technology thereof |
| CN211648216U (en) * | 2020-01-14 | 2020-10-09 | 山东嘉浩矿山机械有限公司 | Self-expansion type pipe seam anchor rod |
| CN212177190U (en) * | 2020-05-26 | 2020-12-18 | 宜昌百川矿山机械有限公司 | Pipe seam anchor rod convenient to disassemble and assemble |
-
2023
- 2023-01-31 CN CN202310048500.1A patent/CN115788498B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101906977A (en) * | 2010-07-21 | 2010-12-08 | 中国矿业大学(北京) | Method for preventing and treating large deformation and collapse of softrock tunnel |
| CN103195441A (en) * | 2013-04-01 | 2013-07-10 | 平顶山天安煤业股份有限公司 | Supporting and reinforcing structure of coal mine tunnel and construction technology thereof |
| CN211648216U (en) * | 2020-01-14 | 2020-10-09 | 山东嘉浩矿山机械有限公司 | Self-expansion type pipe seam anchor rod |
| CN212177190U (en) * | 2020-05-26 | 2020-12-18 | 宜昌百川矿山机械有限公司 | Pipe seam anchor rod convenient to disassemble and assemble |
Non-Patent Citations (1)
| Title |
|---|
| 王玉林，刘彦博: "增加管缝式锚杆锚固力的革新试验" * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115788498B (en) | 2023-05-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2801697A1 (en) | Longwall working face, non-pillared mining method | |
| CN103061783B (en) | Retractable steel tube concrete support | |
| CN107035380A (en) | A kind of mining TBM retrusives method for dismounting | |
| CN115788498A (en) | Mechanical tunneling and supporting method in filling body | |
| CN111088805B (en) | Integrated assembly type supporting device and supporting method thereof | |
| CN110735650A (en) | reinforced construction structure of communication channel between shield tunnels and construction method thereof | |
| CN107816359B (en) | Construction method of underground engineering manual support | |
| CN113187500B (en) | Rapid construction method and expansion equipment for loose surrounding rock expansion net support | |
| CN112196498B (en) | Cross-layer drilling separated type whole-course gas extraction hole sealing device | |
| CN104863599A (en) | Fully-mechanized mining face synchronous slope expansion and installation method and supporting system | |
| CN211648216U (en) | Self-expansion type pipe seam anchor rod | |
| CN204825882U (en) | A mechanical type nail anchor device that is used for pushing up stock between stake of PCMW worker method | |
| CN104121026B (en) | Mine laneway composite supporting construction | |
| CN210622819U (en) | Pipe shed and steel support combined supporting device | |
| CN218624215U (en) | Mine shaft supporting structure | |
| CN107642372B (en) | Tunneling support with forepoling bar | |
| CN102926776B (en) | Continuous and multilayer pre-support method of short downward anchor cable | |
| CN214062956U (en) | Support reinforced (rfd) tunnel quick construction structure based on drainage system | |
| CN102226409B (en) | Stepped-type support of top paving mesh laneway blast advancement face | |
| CN219795283U (en) | Novel steel pipe concrete structure with built-in reinforcement cage | |
| CN203035210U (en) | Resin cartridge filling device for roadway roof bolt drill hole | |
| CN220645978U (en) | Close-range coal seam roadway roof supporting device | |
| CN110725326A (en) | Geotechnical engineering slope reinforcement device and method | |
| CN214221212U (en) | Construction structure for soft rock tunnel face | |
| CN113738409B (en) | Active support type yielding bearing support column and use method thereof |
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 |