CN106948836A - Breaking surrounding rock stope drift active workings method for protecting support in a kind of three-soft seam goaf - Google Patents
Breaking surrounding rock stope drift active workings method for protecting support in a kind of three-soft seam goaf Download PDFInfo
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- CN106948836A CN106948836A CN201710151834.6A CN201710151834A CN106948836A CN 106948836 A CN106948836 A CN 106948836A CN 201710151834 A CN201710151834 A CN 201710151834A CN 106948836 A CN106948836 A CN 106948836A
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- 239000011435 rock Substances 0.000 title claims abstract description 42
- 230000003245 working effect Effects 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 89
- 239000010959 steel Substances 0.000 claims abstract description 89
- 230000008093 supporting effect Effects 0.000 claims abstract description 21
- 238000005553 drilling Methods 0.000 claims abstract description 14
- 238000013461 design Methods 0.000 claims abstract description 5
- 238000005728 strengthening Methods 0.000 claims abstract description 5
- 238000005065 mining Methods 0.000 claims description 9
- 239000003245 coal Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 230000006855 networking Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 241001191009 Gymnomyza Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
- E21D11/22—Clamps or other yieldable means for interconnecting adjacent arch members either rigidly, or allowing arch member parts to slide when subjected to excessive pressure
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/003—Machines for drilling anchor holes and setting anchor bolts
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
The present invention discloses breaking surrounding rock stope drift active workings method for protecting support in a kind of three-soft seam goaf, comprises the following steps：It is arch to design stope drift active workings section in three-soft seam goaf, determine excavated section of road and net section size, in goaf before stope drift active workings driving, twist drill rods are coordinated to make a call to a row hole drilling at the top of excavated section using pneumatic drilling machine, skewer bar is squeezed into along drilling, stope drift active workings are once tunneled after drill steel advance support in goaf, set up the arch U36 type steel sheds of four nodule structures, it is connected between arch U36 type steel sheds with direct-connected plate and curved connecting plate, using modeling netting shield table, I-shaped steel backing plate back of the body top is carried on the back with plank lagging to be helped, the T-shaped canopy strengthening supporting constituted using the two section crossbeams processed by U36 shaped steel and a segmented column leg, adjust the left overlap joint card cable of arch U36 type steel sheds, right overlap joint card cable, the pretightning force of top overlap joint card cable and T-shaped canopy crossbeam card cable, realize arch U36 type steel sheds, the common carrying of T-shaped canopy and compatible deformation, complete driving stope drift active workings once supporting circulation in goaf.
Description
Technical field
The present invention relates to a kind of stope drift active workings method for protecting support, belong to mine down-hole tunnel arrangement and Surrounding Rock Control field, especially
It is related to mine down-hole three-soft seam goaf surrounding rock of actual mining roadway control technology.
Background technology
With the progress and the reduction of coal resources of production technique, just progressively substitution tradition stays coal column to no coal pillar mining technology
Production technique is the further coal mining rate that improves with ensureing that uniformly, working face extraction roadway layout is existed for roadway surrounding rock stress
Into development trend in the goaf of surrouding rock stress reduction.But goaf surrounding rock of actual mining roadway is crushed, part location exists a large amount of
Crack is not fully populated with even, causes goaf rock crusher, self-bearing ability poor, is controlled to surrounding rock of actual mining roadway in goaf
Bring challenge.Existing goaf laneway support method mainly has bolt-mesh-spurting supporting, single frame supporting and Bolt net and jet to coordinate
Single frame combined supporting etc., when goaf top plate is soft rock mass, goaf scope is larger, and broken serious, using anchor
Net spray supporting is difficult in tunnel-surrounding formation anchoring carrying body, and its supporting intensity of single frame supporting country rock is relatively low, embarrasses effectively
The need for controlling deformation of the surrounding rock in tunnel, and when using the Bolt net and jet single frame combined supporting of cooperation, supporting difficulty is big, due to anchor
The support action failure of bar-anchor cable can not form interior outer bearing structure, and supporting effect is bad.
The present invention abandons traditional stope drift active workings breaking surrounding rock using the easily failure and single type steel shed support of anchor pole-cable bolting
The drawbacks of low intensity, it is proposed that a kind of breaking surrounding rock that not only plays also improves roadway support structure from bearer properties
Breaking surrounding rock stope drift active workings method for protecting support in the goaf of bearing strength and cooperative transformation.Goaf rock stress unloading, driving
Convenient and low cost.By carrying out drill steel advance support to breaking surrounding rock in goaf, reduce the Secondary Disturbance of breaking surrounding rock, enter
And to digging laneway use can contracting arch U36 type steel sheds with can contracting T-shaped U36 type steel sheds coordinate control roadway surrounding rock, realization can contract
Arch U36 type steel sheds with can contracting T-shaped U36 type steel sheds common carrying and cooperative transformation, to improve country rock self-supporting, can contracting arch
U36 type steel sheds with can contracting T-shaped U36 type steel sheds it is common strong anti-, advance support is simple, and supporting construction is easily formed, and is goaf
Interior stope drift active workings breaking surrounding rock is stable to provide new implementation method and technological approaches.
The content of the invention
The present invention controls problem based on three-soft seam goaf surrounding rock of actual mining roadway, proposes in a kind of three-soft seam goaf
Breaking surrounding rock stope drift active workings method for protecting support, it is intended to solve stope drift active workings breaking surrounding rock advance support and connection in three-soft seam goaf
Control problem is closed, by carrying out drill steel advance support to breaking surrounding rock in goaf, reduces the Secondary Disturbance of breaking surrounding rock, and then
To digging laneway use can contracting arch U36 type steel sheds with can contracting T-shaped U36 type steel sheds coordinate control roadway surrounding rock, realization can contract arch
Shape U36 type steel sheds with can contracting T-shaped U36 type steel sheds common carrying and cooperative transformation, to improve country rock self-supporting, can contracting arch U36
Type steel shed with can contracting T-shaped U36 type steel sheds it is common strong anti-, realize that surrounding rock of actual mining roadway is stable in goaf.
To solve the above problems, breaking surrounding rock stope drift active workings method for protecting support in a kind of three-soft seam goaf of the invention, its
Adopt the technical scheme that：It is arch to design stope drift active workings section in three-soft seam goaf, determines that excavated section of road breaks with net
First twist drill rods are coordinated to make a gang drill at the top of excavated section using pneumatic drilling machine before face size, goaf stope drift active workings driving
Hole, skewer bar is squeezed into along drilling, after stope drift active workings are once tunneled in goaf, sets up the arch U36 type steel sheds of four nodule structures, arch
It is connected between shape U36 type steel sheds with direct-connected plate and curved connecting plate, using modeling netting shield table, I-shaped steel backing plate back of the body top is carried on the back with plank lagging
Side, constitutes T-shaped canopy using the two section crossbeams processed by U36 shaped steel and a segmented column leg and carries out strengthening supporting, horizontal top bar two ends are opened
If U-shaped neck is placed in above the edge lap card cable of arch U36 type steel sheds two, post leg upper end corbel support three vice card cable on horizontal top bar
Middle card cable position, the left overlap joint card cable of regulation arch U36 type steel sheds, right overlap joint card cable, top overlap joint card cable and T-shaped canopy crossbeam card
The pretightning force of cable, realizes arch U36 type steel sheds, the common carrying of T-shaped canopy and compatible deformation, completes to tunnel back production in goaf
The once supporting circulation in tunnel.
This method is mainly included the following steps that：
Step one, stope drift active workings section configuration is Semicircular arched, stope drift active workings section spring line in design three-soft seam goaf
Hair wide 4600mm, the lower wide 4900mm of hair, the high 3400mm of hair, rough section product 13.9m2, stope drift active workings net section spring line clear span
4200mm, lower wide 4500mm, spring line to base plate 1100mm, spring line to vault center 2100mm, needling 50mm prick 85 ° of angle,
Net sectional area 12.1m2；
In step 2, goaf before stope drift active workings driving, Φ 89mm × 1500mm is coordinated using ZQS-50/1.6 types pneumatic drilling machine
Twist drill rods make a call to a row hole drilling at the top of excavated section by spacing 300mm, 10 ° of the elevation angle, and specification is Φ 80mm by hole depth 1300mm
× 1500mm drill steel is squeezed into along drilling, squeezes into coal body depth 1300mm, exposed 200mm；
Stope drift active workings are once tunneled after drill steel advance support in step 3, goaf, set up arch U36 type steel sheds, arch U36 types
Steel canopy has left arched girder, left arch leg, right arched girder and right arch leg four section structure composition, lap of splice 400mm between section and section, and uses three
Secondary left overlap joint card cable, three secondary right overlap joint card cables are fastenedly connected with three secondary top overlap joint card cables, and the lower end of left arch leg and right arch leg is welded
It is connected between 400mm × 200mm × 150mm anti-plug steel plates, arch U36 type steel sheds with three secondary direct-connected plates and two secondary curved connecting plates,
U36 type steel shed canopies are away from 600mm；
Step 4, shield table is carried out to surrounding rock of actual mining roadway using modeling netting, and the modeling netting lap of splice is 200mm, every with networking rope
A fast knot is twisted every a hole even tightly, and the I-shaped steel backing plate that vault uses length to cut into three pieces for 800mm carries out backboard, I-shaped
Steel backing plate spacing 200mm, portion of side carries out backboard using specification 800mm × 100mm × 70mm plank laggings, plank lagging spacing 300mm,
I-shaped steel backing plate, plank lagging and two vertical with U36 type steel sheds are more than U36 type steel shed outer rims；
Step 5, carries out strengthening supporting to arch U36 type steel sheds, T-shaped canopy is processed using U36 shaped steel, by left horizontal stroke using T-shaped canopy
Beam, right horizontal beam and column leg composition, left crossbeam and right crossbeam length are 1600mm, left crossbeam and right crossbeam lap of splice 600mm, by
Three secondary crossbeam card cables fix composition horizontal top bar, and horizontal top bar two ends open up U-shaped neck and are placed in the left overlap joint card of arch U36 type steel sheds
Cable top and right overlap joint card cable top, post leg length 2700mm, post leg upper end weld length is 210mm corbel, post leg lower end
Specification 400mm × 200mm × 150mm anti-plug steel plates are welded, corbel support is on three secondary crossbeam card cable centre positions of horizontal top bar；
Step 6, the left overlap joint card cable of regulation arch U36 type steel sheds, right overlap joint card cable, top overlap joint card cable and T-shaped canopy crossbeam card cable
Pretightning force, realize arch U36 type steel sheds, the common carrying of T-shaped canopy and compatible deformation, complete to tunnel back production lane in goaf
The once supporting circulation in road.
The advantages of the present invention are：The present invention carries out drill steel to breaking surrounding rock in goaf first and propped up in advance
Shield, reduce breaking surrounding rock Secondary Disturbance, and then to digging laneway use can contracting arch U36 type steel sheds with can contracting T-shaped U36 types
Steel canopy coordinate control roadway surrounding rock, realize can contracting arch U36 type steel sheds with can contracting T-shaped U36 type steel sheds common carrying with cooperateing with
Deformation, the supporting roadway surrounding rock intensity of raising promotes roadway surrounding rock stable.
Brief description of the drawings
Fig. 1 is to realize breaking surrounding rock stope drift active workings method for protecting support schematic diagram in a kind of three-soft seam goaf of the invention.
Fig. 2 is Fig. 1 left crossbeam and left arched girder contact position top view.
Fig. 3 is Fig. 1 posts leg and corbel welding position side view
In figure：1 is edge-bending plate；2 be spring line；3 be left arch leg；4 be stope drift active workings；5 be left overlap joint card cable；6 be straight flange plate；7
For left arched girder；8 be left crossbeam；9 be crossbeam card cable；10 be top overlap joint card cable；11 be I-shaped steel backing plate；12 be corbel；13 be the right side
Crossbeam；14 be right arched girder；15 be post leg；16 be right overlap joint card cable；17 be plank lagging；18 be right arch leg；19 be modeling netting；20 are
Anti-plug steel plate.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with the accompanying drawings with example to this
Invention is described in further detail.
The invention provides breaking surrounding rock stope drift active workings method for protecting support in a kind of three-soft seam goaf.
As shown in Figures 1 to 3, embodiment of the invention comprises the following steps：
Step one, the section configuration of stope drift active workings 4 is Semicircular arched, the section arch camber of stope drift active workings 4 in design three-soft seam goaf
Line 2 maos of wide 4600mm, the lower wide 4900mm of hair, the high 3400mm of hair, rough section product 13.9m2, the net section spring line 2 of stope drift active workings 4 is net
Wide 4200mm, lower wide 4500mm, spring line 2 to base plate 1100mm, spring line 2 to vault center 2100mm, needling 50mm, Zha Jiao
85 °, net sectional area 12.1m2；
Before stope drift active workings 4 are tunneled in step 2, goaf, Φ 89mm × 1500mm is coordinated using ZQS-50/1.6 types pneumatic drilling machine
Twist drill rods make a call to a row hole drilling at the top of excavated section by spacing 300mm, 10 ° of the elevation angle, and specification is Φ 80mm by hole depth 1300mm
× 1500mm skewer bar is squeezed into along drilling, and skewer enters coal body depth for 1300mm, exposed 200mm；
Stope drift active workings 4 are once tunneled after drill steel advance support in step 3, goaf, set up arch U36 type steel sheds, arch U36
Type steel shed has left arched girder 7, left arch leg 3, right arched girder 14 and right arch leg 18 4 section structure composition, the lap of splice between section and section
400mm, and be fastenedly connected with the three secondary left secondary right overlap joint card cables 16 of overlap joint card cable 5, three with three secondary top overlap joint card cables 10, left arch leg 3
Welded with right arch leg 18 lower end between 400mm × 200mm × 150mm anti-plugs steel plate 20, arch U36 type steel sheds with three secondary direct-connected plates 6
It is connected with two secondary curved connecting plates 1, U36 type steel shed canopies are away from 600mm.
Step 4, shield table is carried out to the country rock of stope drift active workings 4 using modeling netting 19, and modeling netting 19 lap of splice is 200mm, is used
Networking rope twists a fast knot even tightly every a hole, and the I-shaped steel backing plate 11 that vault uses length to cut into three pieces for 800mm enters
Row backboard, the spacing 200mm of I-shaped steel backing plate 11, portion of side carries out backboard using specification 800mm × 100mm × 70mm plank laggings 17,
The spacing 300mm of plank lagging 17, I-shaped steel backing plate 11, plank lagging 17 be vertical with U36 type steel sheds and two more than U36 type steel sheds outside
Edge；
Step 5, carries out strengthening supporting to arch U36 type steel sheds, T-shaped canopy is processed using U36 shaped steel, by left horizontal stroke using T-shaped canopy
Beam 8, right crossbeam 13 and post leg 15 are constituted, and left crossbeam 6 is 1600mm with the right length of crossbeam 13, and left crossbeam 8 is overlapped with right crossbeam 13
Length 600mm, is fixed by three secondary crossbeam card cables 9 and constitutes horizontal top bar, horizontal top bar two ends open up U-shaped neck and are placed in arch U36
On the left overlap joint card cable 5 in type steel shed top, the right overlap joint card cable 16 in top, the length 2700mm of post leg 15, the upper end of post leg 15 is welded with length
For 210mm corbel 12, the lower end of post leg 15 welding 400mm × 200mm × 150mm anti-plugs steel plate 20, the support of corbel 12 is on level top
On beam on the centre position of three secondary crossbeam card cables 9；
Step 6, the left overlap joint card cable 5 of regulation arch U36 type steel sheds, right overlap joint card cable 16, top overlap joint card cable 10 and T-shaped canopy crossbeam
The pretightning force of card cable 9, realizes arch U36 type steel sheds, the common carrying of T-shaped canopy and compatible deformation, completes to tunnel back in goaf
Adopt the once supporting circulation in tunnel 4.
The present invention is not limited solely to the description of present embodiment, and that is made within the spirit and principles of the invention appoints
What modification, equivalent and improvement etc., all should be contained within protection scope of the present invention.
Claims (1)
1. breaking surrounding rock stope drift active workings method for protecting support in a kind of three-soft seam goaf, it is characterised in that comprise the following steps：
Step one, stope drift active workings section configuration is Semicircular arched, stope drift active workings section spring line in design three-soft seam goaf
Hair wide 4600mm, the lower wide 4900mm of hair, the high 3400mm of hair, rough section product 13.9m2, stope drift active workings net section spring line clear span
4200mm, lower wide 4500mm, spring line to base plate 1100mm, spring line to vault center 2100mm, needling 50mm prick 85 ° of angle,
Net sectional area 12.1m2；
In step 2, goaf before stope drift active workings driving, Φ 89mm × 1500mm is coordinated using ZQS-50/1.6 types pneumatic drilling machine
Twist drill rods make a call to a row hole drilling at the top of excavated section by spacing 300mm, 10 ° of the elevation angle, and specification is Φ 80mm by hole depth 1300mm
× 1500mm drill steel is squeezed into along drilling, squeezes into coal body depth 1300mm, exposed 200mm；
Stope drift active workings are once tunneled after drill steel advance support in step 3, goaf, set up arch U36 type steel sheds, arch U36 types
Steel canopy has left arched girder, left arch leg, right arched girder and right arch leg four section structure composition, lap of splice 400mm between section and section, and uses three
Secondary left overlap joint card cable, three secondary right overlap joint card cables are fastenedly connected with three secondary top overlap joint card cables, and the lower end of left arch leg and right arch leg is welded
It is connected between 400mm × 200mm × 150mm anti-plug steel plates, arch U36 type steel sheds with three secondary direct-connected plates and two secondary curved connecting plates,
U36 type steel shed canopies are away from 600mm；
Step 4, shield table is carried out to surrounding rock of actual mining roadway using modeling netting, and the modeling netting lap of splice is 200mm, every with networking rope
A fast knot is twisted every a hole even tightly, and the I-shaped steel backing plate that vault uses length to cut into three pieces for 800mm carries out backboard, I-shaped
Steel backing plate spacing 200mm, portion of side carries out backboard using specification 800mm × 100mm × 70mm plank laggings, plank lagging spacing 300mm,
I-shaped steel backing plate, plank lagging and two vertical with U36 type steel sheds are more than U36 type steel shed outer rims；
Step 5, carries out strengthening supporting to arch U36 type steel sheds, T-shaped canopy is processed using U36 shaped steel, by left horizontal stroke using T-shaped canopy
Beam, right horizontal beam and column leg composition, left crossbeam and right crossbeam length are 1600mm, left crossbeam and right crossbeam lap of splice 600mm, by
Three secondary crossbeam card cables fix composition horizontal top bar, and horizontal top bar two ends open up U-shaped neck and are placed in the left overlap joint card of arch U36 type steel sheds
Cable top and right overlap joint card cable top, post leg length 2700mm, post leg upper end weld length is 210mm corbel, post leg lower end
Specification 400mm × 200mm × 150mm anti-plug steel plates are welded, corbel support is on three secondary crossbeam card cable centre positions of horizontal top bar；
Step 6, the left overlap joint card cable of regulation arch U36 type steel sheds, right overlap joint card cable, top overlap joint card cable and T-shaped canopy crossbeam card cable
Pretightning force, realize arch U36 type steel sheds, the common carrying of T-shaped canopy and compatible deformation, complete to tunnel back production lane in goaf
The once supporting circulation in road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710151834.6A CN106948836B (en) | 2017-03-15 | 2017-03-15 | Breaking surrounding rock stope drift active workings method for protecting support in a kind of three-soft seam goaf |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710151834.6A CN106948836B (en) | 2017-03-15 | 2017-03-15 | Breaking surrounding rock stope drift active workings method for protecting support in a kind of three-soft seam goaf |
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| CN106948836A true CN106948836A (en) | 2017-07-14 |
| CN106948836B CN106948836B (en) | 2018-09-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112855224A (en) * | 2020-12-30 | 2021-05-28 | 浙江青山新材料科技有限公司 | High-strength flexible stainless steel and stainless steel part manufactured by same |
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| CN201599043U (en) * | 2010-02-04 | 2010-10-06 | 义马煤业集团股份有限公司常村煤矿 | Composite metal support of mine large-section roadway shoring |
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| CN104653198A (en) * | 2014-12-31 | 2015-05-27 | 中国科学院武汉岩土力学研究所 | Method for filling and constructing foam concrete in coal mine soft rock largely-deformed roadway supporter |
| CN105201524A (en) * | 2015-09-10 | 2015-12-30 | 河南理工大学 | Reserved anchor net and right-angled yieldable shed combined support technology for extremely soft coal seam roadway |
| CN105649657A (en) * | 2016-03-09 | 2016-06-08 | 中国矿业大学 | U-shaped steel bracket with flexible stable supporting device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| SU1149019A1 (en) * | 1983-11-29 | 1985-04-07 | Днепропетровский Государственный Ордена Трудового Красного Знамени Проектный Институт "Днепрогипрошахт" | Arcuate roof support of special rolled shape |
| CN201412166Y (en) * | 2009-06-02 | 2010-02-24 | 中国矿业大学 | Setting pressure device for support of U-shaped steel course |
| CN101725362A (en) * | 2009-12-09 | 2010-06-09 | 中国矿业大学(北京) | Composite support device of dynamic pressure softrock tunnel based on steel pipe concrete bracket |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112855224A (en) * | 2020-12-30 | 2021-05-28 | 浙江青山新材料科技有限公司 | High-strength flexible stainless steel and stainless steel part manufactured by same |
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| Publication number | Publication date |
|---|---|
| CN106948836B (en) | 2018-09-14 |
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