CN107605494B - A kind of crushed zone soft-rock tunnel advance support technology - Google Patents
A kind of crushed zone soft-rock tunnel advance support technology Download PDFInfo
- Publication number
- CN107605494B CN107605494B CN201711079287.1A CN201711079287A CN107605494B CN 107605494 B CN107605494 B CN 107605494B CN 201711079287 A CN201711079287 A CN 201711079287A CN 107605494 B CN107605494 B CN 107605494B
- Authority
- CN
- China
- Prior art keywords
- layer
- fabric
- sponge
- cement
- steelframe
- 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
Landscapes
- Lining And Supports For Tunnels (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The present invention relates to a kind of crushed zone soft-rock tunnel advance support technologies, comprising the following steps: step 1 drills on drift section overhead pulley profile first, drills horizontal by 1~2 °；Step 2 is inserted into round steel in the drilling；Step 3, in front of the drift section, set up first order steelframe, and with round steel weld；Step 4, explosion form tunnel；Step 5, the tunnel bottom surface both side drainage trenching formed in upper separate explosion, and the net blanket made is hung on its top plate；The upper and lower layer fabric can be the synthesis of one or more of non-woven fabrics, woven cloth, woven fabric or looped fabric；Step 6 repeats step 4,5, until stopping explosion when the distance between insufficient adjacent two-stage steelframe of the round steel surplus in drilling；Complete a circulation；Step 7 carries out next circulation, until roadway construction finishes；Water drenching is made full use of, support speed is accelerated, prevents landslide phenomenon, improves construction efficiency.
Description
Technical field
The present invention relates to a kind of advance support technology, in particular to a kind of crushed zone soft rock advance support technology.
Background technique
Advance support technology is before tunnelling, in working face along tunnel axis direction, with the axis according to certain
Angle and spacing carry out advanced active support and maintain it in subsequent driving to reinforce to the Rock And Soil before working face
Stability in the process.
When construction enters structurally fractured zone vein fissure water-bearing layer, this section joint fissure comparative development, stability is poor,
F value is 1.5~4, and there are serious alteration phenomenons, extremely unstable during tunnelling, and since it is located in water-bearing layer,
It is connected with the crevice water on top, with a large amount of water drenchings when construction, allowable exposure time is extremely short, only 0.5~1h, after sinking and blasting
In a relatively short period of time, just occurs serious large area landslide immediately；
If carrying out supporting: the first step according to conventional advanced support method, carry out first gib, including punching and
Steel pipe is inserted, and is connect with the arched roof in outside；Second step carries out next gib, including driving is beaten when tunneling 2 meters or so
Simultaneously insert steel pipe in hole；Third step continues to tunnel, until adding anchor cable according to anchor-net-spray combined supporting or anchor-net-spray at 4 meters or so
Support Method carries out permanent support to tunnel, completes a circulation；4th step, into next circulation；It is dug in this method
Into 4 meters and centre is punched twice, is just carried out permanent support after two slotting steel pipes, is taken a long time, it may appear that large area landslide, separately
Outside, after whitewashing, there are a large amount of water drenchings, until the dry solidification of slurry, it may be desirable to the longer time, it is difficult to ensure that will not be at this section
Between there are a large amount of water drenchings, or even landslide.
Summary of the invention
The present invention in view of the deficiency of the prior art, provides a kind of efficient crushed zone soft-rock tunnel advance support
Technology.
The technical scheme to solve the above technical problems is that a kind of crushed zone soft-rock tunnel advance support technology,
The following steps are included:
Step 1 bores several holes on drift section overhead pulley profile first, and drilling is horizontal by 1~2 °, adjacent brill
The distance between hole is between 150mm~300mm；
Step 2 is inserted into round steel in the drilling, and there are exposed ends outside drift section；
Step 3 at a distance, sets up first order steelframe, and first order steelframe is passed through in front of the drift section
It welds the exposed end of connecting rod and the round steel；
Step 4, explosion form tunnel, and the drilling depth of timely place cleaning after explosion, per tour explosion is less than 1m, after explosion,
Timely place cleaning sets up second level steelframe；Then, second level steelframe and round steel are welded, and second level steelframe is carried out
The spacing of concrete enclosing, the first order steelframe and second level steelframe is generally between 1.0~1.5m, serious in water drenching landslide
Place needs to encrypt, it is ensured that rock pressure can be transmitted in molding supporting construction, while to guarantee ground connection steelframe and
The stability of wall bottom, avoid the occurrence of because load is too big sink the case where, the steelframe is arch-shaped steel frame；
Step 5, the tunnel bottom surface both side drainage trenching formed in upper separate explosion, and hang and made on its top plate
Net blanket can be fixedly mounted on back by net blanket by rock riveting, cement nail etc.；The net blanket include upper layer of fabric, under
Sponge cement layer between layer fabric and setting upper layer of fabric and layer fabric forms net blanket cement plate after meeting water；It is described upper and lower
Layer fabric can be the synthesis of one or more of non-woven fabrics, woven cloth, woven fabric or looped fabric；
Step 6 repeats step 4 and step 5, until between the insufficient adjacent two-stage steelframe of the round steel surplus in drilling
Apart from when, stop explosion；Complete a circulation；
Step 7 continues since step 1, carries out next circulation, until tunnel is formed, and supporting finishes.
The beneficial effects of the present invention are:
1) blasting ratio excavator is into more efficient；
2) explosion 2-3 meters when, that is, set up the second steelframe, then, rapid linked network blanket, it is contemplated that with a large amount of leaching when construction
Water, water drenching are directly poured on net blanket, first is that the purpose of water conservation is played, second is that the purpose of supporting rapidly, third is that ensure that
The drying on tunnel ground guarantees that the intensity of its wall is not influenced by water drenching；
3) supporting effect of the net blanket cement plate formed is more preferable；
4) tunnel bottom surface both side drainage trenching, the water drenching before top plate linked network blanket and toward spraying on net blanket it is complete not by net blanket
The water of hypersorption is discharged by gutter, guarantees the drying on tunnel ground.
Further, the net blanket further includes wire mesh, and the wire mesh is arranged in the layer fabric and the sea
Between continuous cement layer.
Beneficial effect using above-mentioned further technical solution is: wire mesh is equipped in net blanket, after meeting water, cement is solidifying
Gu forming the structure of similar reinforced concrete, intensity is more preferable, and supporting effect is more preferable.
Further, the making step of the net blanket is as follows:
1) prepare material, prepare upper layer of fabric, sponge and layer fabric, the ruler of the layer fabric and the upper layer of fabric
Very little identical, the size of the sponge is less than the size of the upper and lower layer fabric, and the density of the sponge is less than 18kg/m3；
2) sponge cement layer is prepared, sponge is placed on shaking platform, the lower section of shaking platform is equipped with cement recycling dress
It sets, the shaking platform includes shaking platform supporting leg, the metal frame that is mounted on the shaking platform supporting leg and is mounted on described
The vibrating motor of metal frame side is equipped with the wire mesh in the metal frame, constantly from top topple over cement or cement with
The mixture of accelerator, sodium metasilicate, is also provided with distribution device on the shaking platform, distribution device make cement or cement with
The more uniform upper end for being distributed in sponge of mixture of accelerator, sodium metasilicate, the in addition vibration of shaking platform, cement or water
The mixture of mud and accelerator, sodium metasilicate is constantly filled into the gap of sponge, until filling saturation in sponge, forms sponge water
Mud layer, the accelerator dry powder are aluminum oxide clinker and the mixture of lime stone, aluminium ore powder, sodium aluminate, 711 concrete rapid hardenings
One of materials such as agent, calcining milling and lithium carbonate；
3) it sutures, first layer fabric is placed on suture platform, wire mesh and sponge cement layer are placed on together
On the layer fabric, then the upper layer of fabric is placed on the sponge cement layer, it then, will be upper and lower with fiber wire
Layer fabric, sponge cement layer and wire mesh suture, finally do edge sealing suture for sponge cement layer periphery.
Beneficial effect using above-mentioned further technical solution is: can guarantee sponge cement layer using shaking platform vibration
The mixture loading of interior cement or cement and accelerator, sodium metasilicate is more and uniform, and then guarantees net blanket after chance water-setting is solid
Intensity it is larger, and the effect of accelerator and sodium metasilicate can make net blanket quick solidification, can play better supporting effect；
The wire mesh and the fiber wire are equivalent to the effect of aggregate, cement can be made to form, and can increase
The intensity of cement after molding.
Further, the layer fabric in step 3) is placed on suture platform, and the suture platform includes suture platform branch
Leg and be arranged in it is described suture platform legs on hollow out web plate, and the hole of the hollow out web plate be greater than adjacent fiber silk thread it
Between spacing.
Beneficial effect using above-mentioned further technical solution is: facilitating the suture of net blanket.
Further, the metal frame is equipped with groove, and the wire mesh is equipped with handle corresponding with the groove.
Beneficial effect using above-mentioned further technical solution is: wire mesh being facilitated to take off from shaking platform.
Further, the edge of upper and lower layer fabric described in the Edge Distance of the sponge cement layer is 3~20cm.
Further, pressure stubble, the width and the sponge cement of the pressure stubble are equipped between the adjacent net blanket on back
The width at the edge of upper and lower layer fabric described in layer Edge Distance is adapted.
It is seamless between cement plate using the above-mentioned further formation for having the technical effect that guarantee is adjacent, and then guarantee
The intensity of supporting leaks water drenching down.
Further, the spacing between the adjacent drilling is between 200mm~300mm, drilling depth 5.0m, drilling
Diameter is 30~60mm.
Further, the front end of the round steel is in "-" type, and the diameter of the round steel is 25~40mm.
Further, step 4 borehole blasting forms tunnel, drills the periphery, in the interior blasting charge of the drilling at interval more.
Beneficial effect using above-mentioned further technical solution is: can reduce the deformation of rock after explosion, back
It is able to bear certain load.
Detailed description of the invention
Fig. 1 is the status diagram in the present invention after the steelframe supporting of the second level；
Fig. 2 is the structural schematic diagram in the present invention in Fig. 1 along A-A；
Fig. 3 is the structural schematic diagram of net blanket in the present invention；
Fig. 4 is the structural schematic diagram of the shaking platform in the present invention；
Fig. 5 is the structural schematic diagram of the suture platform in the present invention；
In the accompanying drawings, list of designations represented by each label is as follows: 1, construction tunnel, 2, round steel, 3, tunnel it is disconnected
Face, 4, first order steelframe, 5, second level rigid frame, 6, desire construction tunnel, 7, connecting rod, 8, net blanket, 8-1, upper layer of fabric, 8-2, sea
Continuous cement layer, 8-3, layer fabric, 8-4, wire mesh, 8-41, handle, 9, shaking platform, 9-1, shaking platform supporting leg, 9-2,
Vibrating motor, 9-3, metal frame, 10, suture platform, 10-1, suture platform legs, 10-2, hollow out web plate.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the invention.
As Figure 1-Figure 5, a kind of crushed zone soft-rock tunnel advance support technology, comprising the following steps:
Step 1 bores several holes on the drift section overhead pulley profile to be constructed first, drilling horizontal by 1~
2°；
Step 2 is inserted into round steel 2 in the drilling, and the front end of the round steel 2 is in "-" type, and the diameter of the round steel 2 is
25~40mm, there are exposed ends outside drift section 3；
Step 3, at described 3 front a distance of drift section, set up first order steelframe 4, and first order steelframe 4 led to
It welds the exposed end for crossing connecting rod (not drawn in the figure) and the round steel 2；
Step 4 drills the periphery more, and in the interior blasting charge of the drilling at interval, explosion forms tunnel, clears up in time after explosion
The drilling depth of working face, per tour explosion is less than 1m, and after explosion, timely place cleaning sets up second level steelframe；Then, by second
Grade steelframe 5 and round steel 2 weld, and carry out concrete enclosing, the first order steelframe 4 and second level steelframe 5 to second level steelframe 5
Spacing be generally between 1.0~1.5m, need to encrypt at cave in serious place of water drenching, it is ensured that rock pressure can be transmitted to
In molding supporting construction, while to guarantee the steelframe of ground connection and the stability of wall bottom, avoid the occurrence of due to load is too big
The case where sinking, the steelframe are arch-shaped steel frame；
Step 5, the tunnel bottom surface both side drainage trenching formed in upper separate explosion, and hang and made on its top plate
Net blanket 8 can be fixedly mounted on back by net blanket 8 by rock riveting, cement nail etc.；The net blanket 8 includes upper layer of fabric
Sponge cement layer 8-2 between 8-1, layer fabric 8-3 and setting upper layer of fabric 8-1 and layer fabric 8-3, further includes wire
Net, the wire mesh are arranged between the layer fabric and the sponge cement layer, can form net blanket cement plate after meeting water；
The upper and lower layer fabric can be the synthesis of one or more of non-woven fabrics, woven cloth, woven fabric or looped fabric；
Wherein the making step of the net blanket is as follows:
1) prepare material, prepare upper layer of fabric 8-1, sponge and layer fabric 8-3, the layer fabric 8-3 and it is described on
The size of layer fabric 8-1 is identical, and the size of the sponge cement layer 8-2 is less than the size of the upper and lower layer fabric, the sponge
Density be less than 18kg/m3；
2) sponge cement layer 8-2 is prepared, sponge is placed on shaking platform 9, the lower section of shaking platform 9 is returned equipped with cement
Receiving apparatus (is not drawn into) in figure, including shaking platform supporting leg 9-1, the metal frame 9-3 being mounted on the shaking platform supporting leg 9-1
And it is mounted on the vibrating motor 9-2 of the side the metal frame 9-3, the wire mesh, the metal are equipped in the metal frame
Frame is equipped with groove, and the wire mesh is equipped with handle corresponding with the groove, constantly topples over cement or water from top
The mixture of mud and accelerator, sodium metasilicate is also provided with distribution device (being not drawn into figure), cloth on the shaking platform 9
The upper end for being distributed in sponge that device keeps the mixture of cement or cement and accelerator, sodium metasilicate more uniform, vibrates in addition
The mixture of the vibration of platform, cement or cement and accelerator, sodium metasilicate is constantly filled into the gap of sponge, until in sponge
Filling saturation, forms sponge cement layer；
3) it sutures, first layer fabric 8-3 is placed on suture platform 10, by the wire mesh and sponge cement layer 8-
2 are placed on together on the layer fabric 8-3, then the layer fabric 8-3 is placed on the sponge cement layer 8-2；So
Afterwards, upper and lower layer fabric, sponge cement layer and wire mesh are sutured with fiber wire (being not drawn into figure)；Finally, by sponge water
Edge sealing suture is done on mud layer periphery, and the suture platform 10 includes suture platform legs 10-1 and is arranged in the suture platform legs
Hollow out web plate 10-2 on 10-1, and the hole of the hollow out web plate 10-2 is greater than the spacing between adjacent fiber silk thread.
Step 6 repeats step 4 and step 5, until between the insufficient adjacent two-stage steelframe of 2 surplus of round steel in drilling
Apart from when, stop explosion；Complete a circulation；
Step 7 continues since step 1, carries out next circulation, until tunnel is formed, and supporting finishes.
Between adjacent net blanket on back be equipped with pressure stubble, it is described pressure stubble width and sponge cement layer edge away from
The width at the edge from the upper and lower layer fabric is adapted.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of crushed zone soft-rock tunnel advance support technology, which comprises the following steps:
Step 1 bores several holes on drift section overhead pulley profile first, drills horizontal by 1~2 °；
Step 2 is inserted into round steel in the drilling, and there are exposed ends outside drift section；
Step 3 at a distance, sets up first order steelframe, and first order steelframe is passed through connection in front of the drift section
It welds the exposed end of bar and the round steel；
Step 4, explosion form tunnel, and the drilling depth of timely place cleaning after explosion, per tour explosion is less than 1m, after explosion, in time
Place cleaning sets up second level steelframe；Then, second level steelframe and round steel are welded, and concrete enclosing are carried out to steelframe,
The steelframe is arch-shaped steel frame；
Step 5, the tunnel bottom surface both side drainage trenching formed in upper separate explosion, and the net made is hung on its top plate
Blanket, the net blanket include upper layer of fabric, layer fabric and the sponge cement layer being arranged between upper layer of fabric and layer fabric, meet water
Net blanket cement plate is formed afterwards；
Step 6 repeats step 4 and step 5, until the distance between insufficient adjacent two-stage steelframe of the round steel surplus in drilling
When, stop explosion；Complete a circulation；
Step 7 continues since step 1, carries out next circulation, until tunnel is formed, and supporting finishes.
2. crushed zone soft-rock tunnel advance support technology according to claim 1, which is characterized in that the net blanket further includes
Wire mesh, the wire mesh are arranged between the layer fabric and the sponge cement layer.
3. crushed zone soft-rock tunnel advance support technology according to claim 2, which is characterized in that the production of the net blanket
Steps are as follows:
1) prepare material, prepare upper layer of fabric, sponge and layer fabric, the size phase of the layer fabric and the upper layer of fabric
Together, the size of the sponge is less than the size of the upper and lower layer fabric；
2) sponge cement layer is prepared, sponge is placed on shaking platform, the lower section of shaking platform is equipped with cement recyclable device, institute
Stating shaking platform includes shaking platform supporting leg, the metal frame that is mounted on the shaking platform supporting leg and is mounted on the metal frame
The vibrating motor of side is equipped with the wire mesh in the metal frame, constantly from top topple over cement or cement and accelerator,
The mixture of sodium metasilicate, due to the vibration of shaking platform, the mixture of cement or cement and accelerator, sodium metasilicate is constantly filled into
In the gap of sponge, until filling saturation in sponge, forms sponge cement layer；
3) it sutures, first layer fabric is placed on suture platform, wire mesh and sponge cement layer are placed on together described
On layer fabric, then the upper layer of fabric is placed on the sponge cement layer, then, knitted upper and lower layer with fiber wire
Object, sponge cement layer and wire mesh suture, finally do edge sealing suture for sponge cement layer periphery.
4. crushed zone soft-rock tunnel advance support technology according to claim 3, which is characterized in that the lower layer in step 3)
Fabric is placed on suture platform, and the suture platform includes suture platform legs and is arranged in the suture platform legs
Hollow out web plate, and the hole of the hollow out web plate is greater than the spacing between adjacent fiber silk thread.
5. crushed zone soft-rock tunnel advance support technology according to claim 3, which is characterized in that set on the metal frame
Fluted, the wire mesh is equipped with handle corresponding with the groove.
6. according to the described in any item crushed zone soft-rock tunnel advance support technologies of claim 3-5, which is characterized in that the sea
The edge of upper and lower layer fabric described in the Edge Distance of continuous cement layer is 3~20cm.
7. crushed zone soft-rock tunnel advance support technology according to claim 6, which is characterized in that the phase on back
Pressure stubble, the side of upper and lower layer fabric described in the width and the sponge cement layer Edge Distance of the pressure stubble are equipped between adjacent net blanket
The width of edge is adapted.
8. crushed zone soft-rock tunnel advance support technology according to claim 7, which is characterized in that the adjacent drilling
Between spacing between 200mm~300mm, drilling depth 5.0m, the diameter of drilling is 30~60mm.
9. crushed zone soft-rock tunnel advance support technology according to claim 8, which is characterized in that the front end of the round steel
In "-" type, the diameter of the round steel is 25~40mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711079287.1A CN107605494B (en) | 2017-11-06 | 2017-11-06 | A kind of crushed zone soft-rock tunnel advance support technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711079287.1A CN107605494B (en) | 2017-11-06 | 2017-11-06 | A kind of crushed zone soft-rock tunnel advance support technology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107605494A CN107605494A (en) | 2018-01-19 |
| CN107605494B true CN107605494B (en) | 2019-06-28 |
Family
ID=61085086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711079287.1A Active CN107605494B (en) | 2017-11-06 | 2017-11-06 | A kind of crushed zone soft-rock tunnel advance support technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107605494B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108547644B (en) * | 2018-06-12 | 2024-01-05 | 北京市政路桥股份有限公司 | Tunnel crossing crushing belt shed protection structure and supporting method |
| CN109611117B (en) * | 2018-11-16 | 2020-08-25 | 西北矿冶研究院 | Supporting method for mine in acid water environment |
| CN110410082B (en) * | 2019-07-29 | 2021-07-20 | 中国电建集团成都勘测设计研究院有限公司 | Tunnel excavation advance support method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2096622C1 (en) * | 1996-03-19 | 1997-11-20 | Акционерное общество закрытого типа "МЕТРОКОН" | Device for driving deep tunnels in loose ground by advance support method |
| CN205117357U (en) * | 2015-11-21 | 2016-03-30 | 中铁二十局集团第二工程有限公司 | Weak surrounding rock tunnel advance support structure based on self -drilling spiral pipe canopy |
| CN105715276A (en) * | 2016-03-16 | 2016-06-29 | 福州大学 | Forepoling method for actively preventing and controlling rock outburst |
| CN205477642U (en) * | 2016-03-11 | 2016-08-17 | 中铁十八局集团有限公司 | Grow up and bury blow tunnel solderless supporting construction deeply |
| CN106917627A (en) * | 2017-03-24 | 2017-07-04 | 中建交通建设集团有限公司 | The advanced support method of pilot tunnel under a kind of water rich strata boring construction |
-
2017
- 2017-11-06 CN CN201711079287.1A patent/CN107605494B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2096622C1 (en) * | 1996-03-19 | 1997-11-20 | Акционерное общество закрытого типа "МЕТРОКОН" | Device for driving deep tunnels in loose ground by advance support method |
| CN205117357U (en) * | 2015-11-21 | 2016-03-30 | 中铁二十局集团第二工程有限公司 | Weak surrounding rock tunnel advance support structure based on self -drilling spiral pipe canopy |
| CN205477642U (en) * | 2016-03-11 | 2016-08-17 | 中铁十八局集团有限公司 | Grow up and bury blow tunnel solderless supporting construction deeply |
| CN105715276A (en) * | 2016-03-16 | 2016-06-29 | 福州大学 | Forepoling method for actively preventing and controlling rock outburst |
| CN106917627A (en) * | 2017-03-24 | 2017-07-04 | 中建交通建设集团有限公司 | The advanced support method of pilot tunnel under a kind of water rich strata boring construction |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107605494A (en) | 2018-01-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107605494B (en) | A kind of crushed zone soft-rock tunnel advance support technology | |
| CN101967992B (en) | Different-strength bearing roadside filler for pillar-free mining of thin coal bed | |
| CN101144386B (en) | Disposable flexible template device and construction method thereof | |
| CN104005786B (en) | For the cast-in-place foamed partition wall construction method of tailing-filled mining | |
| CN102011588A (en) | House pillar type cutting and filling method of medium coal seam for controlling movement deformation of overlying rock | |
| CN111287759B (en) | Shallow-buried close-connection underground excavation tunnel construction method | |
| CN106968676B (en) | Method for tunneling through cavity | |
| CN107524470B (en) | Geotechnical formwork bag and method for quickly constructing artificial ore pillar | |
| CN111304987A (en) | High-speed foam light soil roadbed structure in mountain area | |
| CN103867225B (en) | A kind ofly prevent colliery from containing spontaneous combustion of coal seam and remove the filling exploitation method of hydrogen sulfide | |
| CN102155012A (en) | Foundation reinforcing construction method employing powder high-pressure injection grouting | |
| CN109503052A (en) | Raw celluar concrete of a plant and preparation method and application | |
| CN106837418A (en) | A kind of trapezoidal fire dam of mine anti-explosion and its construction method | |
| CN205243522U (en) | Tunnel excavation prevents flexible protection device of rock burst falling rocks | |
| CN104653198A (en) | Method for filling and constructing foam concrete in coal mine soft rock largely-deformed roadway supporter | |
| CN108374672B (en) | A method of reinforcing Deep Mine soft coal level roadway surrounding rock | |
| CN103410158B (en) | A kind of recyclable vertical type door frame is from steady building enclosure and its application process | |
| CN207211165U (en) | A kind of compound antiskid piling wall retaining structure suitable for reservoir stability | |
| CN109812269A (en) | It is a kind of suitable for second mining working face without pillar mining method | |
| CN103215950A (en) | Pile foundation extension construction method in backfilling area | |
| CN102359101A (en) | Foundation treatment method for collapsible soil | |
| CN107654232A (en) | The moat ditch collection ore deposit mining methods of inclined orebody | |
| CN114197502B (en) | Recyclable palace laminated green protection grid and construction method thereof | |
| CN104963427B (en) | A kind of solar greenhouse wall body and preparation method thereof | |
| CN208884537U (en) | A kind of New-type mould bag soil nailing pile composite supporting structure |
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 |