CN207620819U - A kind of tunnel U-shaped steel set canopy supporting construction - Google Patents

Abstract

The utility model discloses a kind of tunnel U-shaped steels 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

A kind of tunnel U-shaped steel set canopy supporting construction

Technical field

The utility model belongs to mining engineering supporting roadway surrounding rock technical field, is related to a kind of tunnel set 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, the utility model provides a kind of tunnel U-shaped steel set canopy supporting construction, can effectively solve Existing deep soft rock broken rocks support technology there are the problem of.Specific technical solution is as follows：

A kind of tunnel U-shaped steel set canopy supporting construction, including it is hung on the metal mesh in roadway surrounding rock face, and with crossing at right angle The steel bar ladder laid of mode, steel bar ladder is set to the inside of metal mesh, and metal mesh and steel bar ladder are fixed on lane by anchor cable On road country rock face, the inside of metal mesh and steel bar ladder passes through 8 sets of canopies of inverted outer layer U-shaped steel for matching with 1 cross section of tunnel Supporting is additionally provided with inverted internal layer U-shaped steel on the inside of outer layer U-shaped steel, bar-mat reinforcement, reinforcing bar is linked on the outside of internal layer U-shaped steel Net is outer to be equipped with oilcloth, and concrete is perfused between oilcloth and outer layer U-shaped steel to form supporting rigid layer, and in supporting rigid layer Reinforced steel is poured, length direction of the reinforced steel along tunnel is arranged, and reinforced steel is equidistantly equal in supporting rigid layer Even distribution setting, the inside are the one side towards tunnel, and the outside is the one side towards country rock face.

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 outer layer U-shaped steel and internal layer U-shaped steel are arranged in a one-to-one correspondence, between adjacent outward layer U-shaped steel and each position of internal layer U-shaped steel away from From identical, adjacent two outer layers U-shaped steel is fixedly connected by card cable with adjacent two internal layers U-shaped steel.

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 or steel bar ladder by pallet card.

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.

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.

The utility model provides a kind of tunnel U-shaped steel set canopy supporting construction, including hang on the metal mesh in 1 country rock face of tunnel 15, and the steel bar ladder 16 laid in a manner of decussate, steel bar ladder 16 be set to the inside of metal mesh 15, and metal mesh 15 It is fixed on 1 country rock face of tunnel by anchor cable 2 with steel bar ladder 16, specially：The top plate and country rock in tunnel 1 are provided with anchor cable hole, One end of anchor cable 2 is fixed in anchor cable hole, and the other end is blocked by pallet 3 sets the inside for being fixed on metal mesh 15 or steel bar ladder 16. The inside of metal mesh 15 and steel bar ladder 16 is by 8 sets of canopy supportings of inverted outer layer U-shaped steel for matching with 1 cross section of tunnel, outside The inside of layer U-shaped steel 8 is additionally provided with inverted internal layer U-shaped steel 9, and the outside of internal layer U-shaped steel 9 is linked with bar-mat reinforcement 10, bar-mat reinforcement It is equipped with oilcloth 11 outside 10, concrete is perfused between oilcloth 11 and outer layer U-shaped steel 8 to form supporting rigid layer 14, and supporting Reinforced steel 13 is poured in rigid layer 14, length direction of the reinforced steel 13 along tunnel 1 is arranged, and reinforced steel 13 is in supporting Setting is equidistantly uniformly distributed in rigid layer 14, the inside is the one side towards tunnel 1, and the outside is towards country rock face On one side.

Outer layer U-shaped steel 8 and internal layer U-shaped steel 9 are along the length direction in tunnel 1 successively equidistantly distributed, and outer layer U-shaped steel 8 It is arranged in a one-to-one correspondence with internal layer U-shaped steel 9, the distance between 9 each position of adjacent outward layer U-shaped steel 8 and internal layer U-shaped steel is identical, adjacent Two outer layer U-shaped steels 8 are fixedly connected by card cable 7 with adjacent two internal layers U-shaped steel 9.

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, shape At Bolt net and jet layer, cement mortar mix ratio is cement：Sand=1:2.5, accelerator ratio is the 3~5% of cement consumption, injection The work of grouting presses air control system in 0.15~0.18Mpa.The jet thickness of concrete 12 will meet 1 surface of enclosing tunnel and enclose Rock, filling steel bar ladder 16 and surface country rock between gap purpose, Bolt net and jet layer thickness be 200mm, can prevent in this way country rock into One step weathering and deliquescence make 1 liang of tunnel side and roof toad stepless action avoid the occurrence of stress concentration on holder to reach 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, canopy supporting, the outer layer U are covered using outer layer U-shaped steel Shape steel bracket is stalk semicircle arch form, is formed by connecting by card cable 7 by multiple outer layer U-shaped steels；It is to use lower clear span to cover canopy specification No. 29 U-shaped steels that × middle clear height is 4279 × 3000mm cover canopy and are set up, and for canopy away from for 500mm, hamstring depth is 300mm；Set 200mm spacing is equipped with after canopy between shed Edge Distance original roadway support section, i.e. Bolt net and jet layer thickness is 200mm；Set canopy is wanted 50mm cannot be more than for canopy away from deviation by asking, and torsional deflection is no more than 50mm, and the uneven deviation of capplce leg or so is no more than 40mm, prop setting angle degree meet the requirements, and canopy leg legs and feet are erected on real 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 formed by connecting by card cable 7 by multiple internal layer U-shaped steels 9, internal layer described in every two pieces 9 holder of U-shaped steel 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 add the grouting of reinforced steel 13 and 50cm thickness, the coagulation that grouting hardening thick 50cm is formed Native holder 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 (3)

1. a kind of tunnel U-shaped steel covers canopy supporting construction, it is characterised in that：Including hanging on tunnel（1）The metal mesh in country rock face （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 by with tunnel（1）The inverted outer layer U-shaped steel that cross section matches（8）Cover canopy supporting, outer layer U-shaped steel（8）It is interior Side is additionally provided with inverted internal layer U-shaped steel（9）, internal layer U-shaped steel（9）Outside be linked with bar-mat reinforcement（10）, bar-mat reinforcement（10）Outside It is equipped with oilcloth（11）, oilcloth（11）With outer layer U-shaped steel（8）Between be perfused with concrete to form supporting rigid layer（14）, and Supporting rigid layer（14）Reinforced steel is inside poured（13）, reinforced steel（13）Along tunnel（1）Length direction setting, and reinforce Reinforcing bar（13）In supporting rigid layer（14）Interior to be equidistantly uniformly distributed setting, the inside is towards tunnel（1）One side, it is described Outside is the one side towards country rock face.

2. a kind of tunnel U-shaped steel according to claim 1 covers 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, and outer layer U-shaped steel successively（8）It is U-shaped with internal layer Steel（9）It is arranged in a one-to-one correspondence, adjacent outward layer U-shaped steel（8）With internal layer U-shaped steel（9）The distance between each position is identical, 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.

3. a kind of tunnel U-shaped steel according to claim 1 covers canopy supporting construction, it is characterised in that：Tunnel（1）Top plate and Country rock is 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 Net（15）Or steel bar ladder（16）Inside.