CN207620820U - A kind of breaking surrounding rock and soft-rock tunnel U-shaped steel cover canopy supporting construction - Google Patents
A kind of breaking surrounding rock and soft-rock tunnel U-shaped steel cover canopy supporting construction Download PDFInfo
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- CN207620820U CN207620820U CN201721795720.7U CN201721795720U CN207620820U CN 207620820 U CN207620820 U CN 207620820U CN 201721795720 U CN201721795720 U CN 201721795720U CN 207620820 U CN207620820 U CN 207620820U
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Abstract
The utility model discloses a kind of breaking surrounding rocks and soft-rock tunnel U-shaped steel to cover canopy supporting construction, the method for protecting support of canopy+grouting is covered using anchor cable+metal mesh+whitewashing+U-shaped steel, it is initially formed Bolt net and jet layer, its have prevent the further weathering of country rock and deliquescence, make roadway's sides and roof toad stepless action on holder to avoid there is stress concentration, quickly come compressive strain and roof caving so as to effectively control roadway excavation initial stage rock crusher, eventually forms tunnel surface Bolt net and jet combination isolation arch；Secondly one layer of supporting rigid layer is formd between two layers of U-shaped steel, the structure can High-strength compression resistant, it can moderately allow pressure again, form the double-deck supporting construction of " tempering toughness with gentleness ", the stability and supporting intensity for greatly improving broken soft rock roadway surrounding rock provide certain guarantee, while being also enterprise to reduce a certain amount of roadway maintenance expense for the safety in production of coal mine, it is of great advantage to the development of coal enterprise, it can be promoted the use of on a large scale.
Description
Technical field
The utility model belongs to mining engineering supporting roadway surrounding rock technical field, is related to a kind of breaking surrounding rock and soft-rock tunnel
U-shaped steel covers canopy supporting construction.
Background technology
Studies have shown that coal will not occur at all as the status of China's main body energy within the following significant period of time
Change.With superficial part coal resources increasingly depleted, coal mining depth and mining rate are continuously improved, with coal mining depth
Increase, geological conditions deteriorates, fragmented rock body increases, crustal stress increases, head pressure increases, ground temperature increases etc. exacerbates soft rock
The severe degree that strata behavior analysis of roadway shows, Deformation in Soft Rock Tunnel destroy serious.Deep rock mass is in the complicated power of " a three high disturbances "
Learn environment so that coal mine Deep Soft Rock Tunnel adjoining rock stability is become increasingly conspicuous by multifactor functioning, Surrounding Rock Control problem.Soft rock
Roadway support is still an important and complicated technical problem in world today's mining and underground engineering, deep high stressed soft rock
Roadway support is an important research direction, it is the key that old mine expands and carry out deep resource exploitation skill to deep
Art.
The patent that can be retrieved in disclosed document has：Application No. is 201710147579.8 " deep dynamic pressure is soft
Rock gangway road U-shaped steel composite supporting construction and its construction method ", and application No. is 201510637612.6 " broken soft rock lanes
Tunneling boring closed depth coupling in road, which allows, presses bolt-grouting support method ".Two above patent be each provided with control deep it is relatively broken and
The method of country rock of soft rock roadway, but the former does not carry out Bolt net and jet after digging lane, but directly beat armature boring and carry out anchor pole branch
Shield, it is not form an anchor cable extrusion reinforcing arch first to do so, can cause supporting intensity weaker in this way and shield table ability compared with
It is weak, it can followed by make the further weathering of country rock and deliquescence in this way, prevent roadway's sides and roof toad from stepless action in holder
It is upper so that there is the phenomenon that stress concentration, quickly carry out compressive strain to cannot effectively control roadway excavation initial stage rock crusher
And roof caving, finally accelerate the destruction in tunnel and ideal effect is not achieved；The latter do not have unfortunately using U-shaped steel into
Row support reinforcement can cause tunnel cannot not hold time longly to increase roadway maintenance expense in this way, generate unnecessary economy and open
Branch.
Invention content
In order to solve the above technical problems, a kind of breaking surrounding rock of the utility model offer and soft-rock tunnel U-shaped steel cover canopy supporting
Structure can effectively solve the problems, such as that existing deep soft rock broken rocks support technology exists.Specific technical solution is as follows：
A kind of breaking surrounding rock and soft-rock tunnel U-shaped steel cover canopy supporting construction, including hang on the metal mesh in roadway surrounding rock face,
And the steel bar ladder laid in a manner of decussate, steel bar ladder is set to the inside of metal mesh, and metal mesh and steel bar ladder are logical
It crosses anchor cable to be fixed on roadway surrounding rock face, the inside of metal mesh and steel bar ladder is also injected with Bolt net and jet layer, the inside of Bolt net and jet layer
Canopy supporting is covered by the inverted outer layer U-shaped steel to match with tunnel cross section, internal layer U is additionally provided on the inside of outer layer U-shaped steel
Shaped steel covers canopy supporting, and bar-mat reinforcement is linked on the outside of internal layer U-shaped steel, is equipped with oilcloth outside bar-mat reinforcement, oilcloth and outer layer U-shaped steel it
Between be perfused with concrete to form supporting rigid layer, the inside is the one side towards tunnel, and the outside is towards country rock face
One side.
In aforementioned supporting construction, the outer layer U-shaped steel and internal layer U-shaped steel are equidistantly divided along the length direction in tunnel successively
Cloth, and adjacent two outer layers U-shaped steel and adjacent two internal layers U-shaped steel are fixedly connected sequentially by card cable；
In aforementioned supporting construction, the Bolt net and jet layer is the concrete layer of injection setting；
In aforementioned supporting construction, the top plate and country rock in tunnel are provided with anchor cable hole, and one end of anchor cable is fixed in anchor cable hole,
The other end sets the inside for being fixed on metal mesh by pallet card.
In aforementioned supporting construction, the long 6m of anchor cable, array pitch is 1200 × 1200mm, and pretightning force is 55~80KN, steel bar ladder
For welding processing, specification is 12~14mm of diameter, and width is 80~100mm；
In aforementioned supporting construction, Bolt net and jet layer thickness is 200mm, and supporting rigidity layer thickness is 500mm.
The utility model has the beneficial effects that：The supporting construction of canopy+grouting is covered using anchor cable+metal mesh+whitewashing+U-shaped steel,
It is initially formed Bolt net and jet layer, having prevents the further weathering of country rock and deliquescence, makes roadway's sides and roof toad stepless action
To avoid there is stress concentration on holder, so as to effectively control roadway excavation initial stage rock crusher quickly come compressive strain and
Roof caving eventually forms tunnel surface Bolt net and jet combination isolation arch；Secondly it is rigid one layer of supporting to be formd between two layers of U-shaped steel
Property layer, the structure High-strength compression resistant and can moderately allow pressure, form the double-deck supporting construction of " tempering toughness with gentleness ", carry significantly
The stability and supporting intensity for having risen broken soft rock roadway surrounding rock provide certain guarantee for the safety in production of coal mine, while
Reduce a certain amount of roadway maintenance expense for enterprise, of great advantage to the development of coal enterprise, can carry out promoting on a large scale makes
With.
Description of the drawings
Fig. 1 is the supporting roadway surrounding rock structural schematic diagram of the utility model.
Fig. 2 is the utility model U-shaped steel set canopy supporting structure schematic diagram；
Fig. 3 is the side view of Fig. 2.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.
A kind of breaking surrounding rock of the utility model offer and soft-rock tunnel U-shaped steel cover canopy supporting construction, including：It hang on tunnel
The metal mesh 15 in 1 country rock face, and the steel bar ladder 16 laid in a manner of decussate, steel bar ladder 16 are set to metal mesh 15
Inside, and metal mesh 15 and steel bar ladder 16 are fixed on by anchor cable 2 on 1 country rock face of tunnel, metal mesh 15 and steel bar ladder 16 it is interior
Side is also injected with Bolt net and jet layer 13, and the inside of Bolt net and jet layer 13 passes through the inverted outer layer U-shaped steel that matches with 1 cross section of tunnel
The inside of 8 sets of canopy supportings, outer layer U-shaped steel 8 is additionally provided with the 9 sets of canopy supportings of internal layer U-shaped steel, and outer layer U-shaped steel 8 and internal layer U-shaped steel 9 are equal
Length direction equidistantly distributed successively along tunnel 1, and adjacent two outer layers U-shaped steel 8 and adjacent two internal layers U-shaped steel 9 pass through card
Cable 7 is fixedly connected, and the outside of internal layer U-shaped steel 9 is linked with bar-mat reinforcement 10, is equipped with oilcloth 11 outside bar-mat reinforcement 10, oilcloth 11 with it is outer
It is perfused with concrete between layer U-shaped steel 8 to form supporting rigid layer 14, Bolt net and jet layer 13 is the concrete layer of injection setting, anchor
13 thickness of net spray-up is 200mm, and 14 thickness of supporting rigid layer is 500mm, and the inside is the one side towards tunnel 1, described outer
Side is the one side towards country rock face.
Steps are as follows for its Specific construction：
Step 1：It after tunnel 1 is tunneled, is tapped immediately, in tunnel, 1 top plate and country rock beat anchor cable hole, install anchor
Rope 2,2 length of high-strength prestressed anchor cable are 6m, 1200 × 1200mm of array pitch, 55~80KN of pretightning force；Country rock face close plating net
15 and steel bar ladder 16 is laid in a manner of decussate, steel bar ladder 16 uses welding processing, and specification is 12~14mm of diameter, wide
Degree is 80~100mm, and installation anchor cable pallet 3 passes through anchor cable 2 to compress steel bar ladder 16, and reach the preload of setting
Power quickly forms superficial part supporting intensity height and protects the strong anchor cable extrusion reinforcing arch of table ability.
Step 2：The high-strength prestressed anchor cable in country rock face 2 is after installation is complete, and in tunnel, 1 top plate, two help gunite concrete 12,
Bolt net and jet layer 13 is formed, cement mortar mix ratio is cement：Sand=1:2.5, accelerator ratio is the 3~5% of cement consumption,
The work of jet grouting presses air control system in 0.15~0.18Mpa.The jet thickness of concrete 12 will meet 1 surface of enclosing tunnel
The purpose in gap, 13 thickness of Bolt net and jet layer are 200mm between country rock, filling steel bar ladder 16 and surface country rock, can prevent from enclosing in this way
The further weathering of rock and deliquescence make 1 liang of tunnel side and roof toad stepless action avoid the occurrence of stress collection on holder to reach
In phenomenon, so as to effectively control tunnel 1 excavate initial stage rock crusher quickly come compressive strain and roof caving, eventually form
Tunnel surface Bolt net and jet combination isolation arch；
Step 3：After forming tunnel surface Bolt net and jet combination isolation arch, using the 8 sets of canopy supportings of outer layer U-shaped steel, the outer layer
8 holder of U-shaped steel is stalk semicircle arch form, is formed by connecting by card cable 7 by multiple U-shaped steels, by connecting steel between the U-shaped steel
6 reinforcement by connection of bar 5 and bolt；Set canopy specification is that lower clear span × middle clear height is used to cover canopy for No. 29 U-shaped steels of 4279 × 3000mm
It is set up, for canopy away from for 500mm, hamstring depth is 300mm；It is equipped between shed Edge Distance original roadway support section after set canopy
200mm spacing, i.e. Bolt net and jet layer thickness are 200mm；It covers canopy to require that 50mm cannot be more than away from deviation for canopy, torsional deflection cannot surpass
50mm is crossed, the uneven deviation of capplce leg or so meets the requirements no more than 40mm, prop setting angle degree, and canopy leg legs and feet are erected at reality
On bottom；
Step 4：When having set up 8 sets of canopies of outer layer U-shaped steel, continue to set up internal layer 9 sets of canopies of U-shaped steel, internal layer in the same fashion
9 holder of U-shaped steel is similarly stalk semicircle arch form, is connected in sequence by card cable 7 by multiple U-shaped steels, U-shaped steel described in every two pieces
Holder is by connecting steel pole 5 and 6 reinforcement by connection of bolt；
Step 5：After waiting for that two layers of U-shaped steel set canopy is set up well, extension bar-mat reinforcement 10 is laid with oil on 9 sets of canopies of internal layer U-shaped steel
Cloth 11；
Step 6：It, can be to setting up after waiting on 9 sets of canopies of internal layer U-shaped steel that bar-mat reinforcement 10 is hung up properly and oilcloth 11 lays
Two layers of U-shaped steel between space carry out the grouting of 50cm thickness, the concrete support and U-shaped steel of grouting hardening formation thick 50cm
Combination forms supporting rigid layer 14.
The preferable specific implementation mode of the above, only the utility model, but the scope of protection of the utility model is not
Be confined to this, any one skilled in the art within the technical scope disclosed by the utility model, according to this practicality
Novel technical solution and its utility model design are subject to equivalent substitution or change, should all cover the protection model in the utility model
Within enclosing.
Claims (5)
1. a kind of breaking surrounding rock and soft-rock tunnel U-shaped steel cover canopy supporting construction, it is characterised in that：Including hanging on tunnel（1）It encloses
The metal mesh of scar（15）, and the steel bar ladder laid in a manner of decussate（16）, steel bar ladder（16）It is set to metal mesh
（15）Inside, and metal mesh（15）And steel bar ladder（16）Pass through anchor cable（2）It is fixed on tunnel（1）On country rock face, metal mesh
（15）And steel bar ladder（16）Inside be also injected with Bolt net and jet layer（13）, Bolt net and jet layer（13）Inside by with tunnel（1）It is horizontal
The inverted outer layer U-shaped steel that section matches（8）Cover canopy supporting, outer layer U-shaped steel（8）Inside be additionally provided with internal layer U-shaped steel（9）
Cover canopy supporting, internal layer U-shaped steel（9）Outside be linked with bar-mat reinforcement（10）, bar-mat reinforcement（10）It is equipped with oilcloth outside（11）, oilcloth
（11）With outer layer U-shaped steel（8）Between be perfused with concrete to form supporting rigid layer（14）, the inside is towards tunnel（1）
One side, the outside be the one side towards country rock face.
2. a kind of breaking surrounding rock according to claim 1 and soft-rock tunnel U-shaped steel cover canopy supporting construction, it is characterised in that：
The outer layer U-shaped steel（8）With internal layer U-shaped steel（9）Along tunnel（1）Length direction equidistantly distributed successively, and outside adjacent two
Layer U-shaped steel（8）With adjacent two internal layers U-shaped steel（9）Pass through card cable（7）It is fixedly connected sequentially.
3. a kind of breaking surrounding rock according to claim 1 and soft-rock tunnel U-shaped steel cover canopy supporting construction, it is characterised in that：
The Bolt net and jet layer（13）For the concrete layer of injection setting.
4. a kind of breaking surrounding rock according to claim 1 and soft-rock tunnel U-shaped steel cover canopy supporting construction, it is characterised in that：
Tunnel（1）Top plate and country rock be provided with anchor cable hole, anchor cable（2）One end be fixed in anchor cable hole, the other end passes through pallet（3）
Card, which is set, is fixed on metal mesh（15）Inside.
5. a kind of breaking surrounding rock according to claim 1 and soft-rock tunnel U-shaped steel cover canopy supporting construction, it is characterised in that：
Anchor cable（2）Long 6m, array pitch are 1200 × 1200mm, and pretightning force is 55~80KN, steel bar ladder（16）For welding processing, specification
For 12~14mm of diameter, width is 80~100mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721795720.7U CN207620820U (en) | 2017-12-20 | 2017-12-20 | A kind of breaking surrounding rock and soft-rock tunnel U-shaped steel cover canopy supporting construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721795720.7U CN207620820U (en) | 2017-12-20 | 2017-12-20 | A kind of breaking surrounding rock and soft-rock tunnel U-shaped steel cover canopy supporting construction |
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| CN207620820U true CN207620820U (en) | 2018-07-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113187506A (en) * | 2021-04-30 | 2021-07-30 | 浙江省工程勘察设计院集团有限公司 | Yielding support structure and method for measuring pressure and deformation of surrounding rock |
| CN114233394A (en) * | 2021-11-26 | 2022-03-25 | 安徽理工大学 | Stoping roadway surrounding rock monitoring and supporting method |
-
2017
- 2017-12-20 CN CN201721795720.7U patent/CN207620820U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113187506A (en) * | 2021-04-30 | 2021-07-30 | 浙江省工程勘察设计院集团有限公司 | Yielding support structure and method for measuring pressure and deformation of surrounding rock |
| CN114233394A (en) * | 2021-11-26 | 2022-03-25 | 安徽理工大学 | Stoping roadway surrounding rock monitoring and supporting method |
| CN114233394B (en) * | 2021-11-26 | 2023-10-31 | 安徽理工大学 | Surrounding rock monitoring and supporting method for stoping roadway |
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