CN106761811A - Deep-well high stress and soft rock mine roadway composite anchored net Steel bar rack supporting construction and its construction method - Google Patents

Deep-well high stress and soft rock mine roadway composite anchored net Steel bar rack supporting construction and its construction method Download PDF

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Publication number
CN106761811A
CN106761811A CN201611166999.2A CN201611166999A CN106761811A CN 106761811 A CN106761811 A CN 106761811A CN 201611166999 A CN201611166999 A CN 201611166999A CN 106761811 A CN106761811 A CN 106761811A
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China
Prior art keywords
bar
steel bar
polyester fiber
mat reinforcement
spray coating
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Application number
CN201611166999.2A
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Chinese (zh)
Inventor
姚韦靖
何壮志
庞建勇
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Anhui University of Science and Technology
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Anhui University of Science and Technology
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Priority to CN201611166999.2A priority Critical patent/CN106761811A/en
Publication of CN106761811A publication Critical patent/CN106761811A/en
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/10Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/10Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
    • E21D11/105Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/14Lining predominantly with metal
    • E21D11/15Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
    • E21D11/152Laggings made of grids or nettings
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts

Abstract

The invention provides deep-well high stress and soft rock mine roadway composite anchored net Steel bar rack supporting construction and its construction method, anchor pole and anchor cable are squeezed into inside country rock first, and expose preseting length, extension bar-mat reinforcement and polyester fiber net are spread successively followed by anchor pole and anchor cable exposed parts, bar-mat reinforcement is close to country rock laying, polyester fiber net is close to bar-mat reinforcement laying, steel bar mesh shell bracket is set up again, anchor pole and anchor cable sequentially pass through bar-mat reinforcement, polyester fiber net and steel bar mesh shell bracket are simultaneously fixed on steel bar mesh shell bracket by pallet and nut, pour the first concrete spray coating and close whole supporting construction, complete initial support, finally pour the second concrete spray coating, complete secondary supporting.By initial support, make total and country rock common eigenvector, performance allows pressure to act on, and discharges pressure from surrounding rock, carries out secondary supporting again afterwards, while the flexible and release using polyester fiber net is acted on, pressure from surrounding rock is uniformly distributed in whole support system.

Description

Deep-well high stress and soft rock mine roadway composite anchored net Steel bar rack supporting construction and its construction Method
Technical field
The invention belongs to mine working and tunnel support technical field, and in particular to compound to deep-well high stress and soft rock mine roadway Anchor net Steel bar rack supporting construction and its construction method.
Background technology
Currently, as pit mining depth is continued to increase, carried out in deep-well high stressed soft rock pick lane it is increasing, due to Geostatic pressure is strong, and stratum is weak, and the stability and bearing capacity of supporting construction are badly in need of significantly strengthening.Conventional bolt-mesh-spurting supporting structure Enabling capabilities it is significantly not enough, typically add again frequently with shotcrete shape steel bracket or wall rock grouting or long anchor cable etc. carry out joint branch , also there is similar situation, so that support technology more sophisticated, quantities and expense also significantly increase in shield in Tunnel Engineering Plus.
In the prior art, it is further to administer control soft-rock tunnel, its method has a lot.Such as Chinese patent (application number: 00119101.2, patent name:Steel bar mesh shell bracket and wire-shell bolting shotcrete supporting) utilization space network, added by several Pin components Bolt-connection is continuously installed into a frame support, frame with frame, both can individually supporting, it is also possible to anchor pole, spray-up composition reticulated shell anchor Spray structure, reduces support cost, improves enabling capabilities;And for example Chinese patent (application number:201310060613.X, patent Title:A kind of cherry coal/rock stratum laneway support method and supporting construction) slurries reinforcing group is formed by bored grouting first, pacify afterwards Dress anchor cable, is particularly well-suited to the roadway support of cherry coal/rock stratum;For another example Chinese patent (application number:200810246306.X, patent Title:A kind of soft expansion type wall rock tunnel support method) skeleton enclosing tunnel is used as by grillage and double layer bar, Supporting construction is caused to ftracture while laying foam carpet and being prevented effectively from country rock dilatancy.
Above-mentioned control measures and construction method have its different use condition and advantage and disadvantage, during practice of construction, Often rational administering method should be selected according to different geological conditions and construction equipment.Deep-well high stress and soft rock mine roadway compound anchor Net Steel bar rack supporting construction, reasonable in design, construction technology is simple, quantities is small, supporting expense is low, can be good at adapting to soft The supporting requirement in rock gangway road.
The content of the invention
In view of the shortcomings of the prior art, the deep-well high stress and soft rock mine roadway composite anchored net Steel bar rack supporting that the present invention is provided Structure and its construction method, can provide effective support to soft-rock tunnel, and engineering practicability is strong.
To achieve the above object, the present invention is achieved by the following technical programs:
Deep-well high stress and soft rock mine roadway composite anchored net Steel bar rack supporting construction and its construction method, including anchor pole, anchor cable, Bar-mat reinforcement, polyester fiber net, steel bar mesh shell bracket, the first concrete spray coating, the second concrete spray coating, pallet and nut, first The anchor pole and anchor cable are squeezed into inside country rock, and exposes certain length, to play supporting country rock, play the autonomous bearing capacity of country rock Purpose, spread the extension bar-mat reinforcement and polyester fiber net, the bar-mat reinforcement successively followed by the exposed parts of anchor pole and anchor cable It is close to country rock laying, the polyester fiber net is close to the bar-mat reinforcement laying, then sets up the steel bar mesh shell bracket, the anchor pole The bar-mat reinforcement, polyester fiber net and steel bar mesh shell bracket are sequentially passed through with anchor cable and institute is fixed on by the pallet and nut State on steel bar mesh shell bracket, pour first concrete spray coating and close whole supporting construction, complete initial support, finally pour Second concrete spray coating, completes secondary supporting, forms deep-well high stress and soft rock mine roadway composite anchored net Steel bar rack supporting knot Structure.
Further, the anchor pole be high-strength prestressed anchor pole, a diameter of Φ 18-22mm, length is 2200-2800mm, Spacing is 700mm, and array pitch is 700mm, and prestressing force is 50-70kN, and the anchor cable is high-strength prestressed anchor cable, a diameter of Φ 18- 22mm, length is 6000-8000mm, and prestressing force is not less than 150kN.
Further, the length of the bar-mat reinforcement is 6-12m, and width is 2-5m, and the bar-mat reinforcement is formed by reinforcement welding, The spacing of welding is 100mm, 150mm or 200mm, and a diameter of Φ 8-22mm of the reinforcing bar, the mesh of the bar-mat reinforcement is square Shape or rhombus.
Further, the length of the polyester fiber net is 6-12m, and width is 2-5m, and the polyester fiber net is by polyester Filament braiding is formed, and the width of the polyester fiber silk is 15mm, and the mesh of the polyester fiber net is rectangle, the rectangle The specification of mesh is 100mm × 100mm, 150mm × 150mm or 200mm × 200mm.
Above-mentioned deep-well high stress and soft rock mine roadway composite anchored net Steel bar rack supporting construction and its construction method, what is used applies Work method comprises the following steps:
A the section configuration and size for) being designed according to tunnel excavate tunnel, and are looked in drift section injection 50mm thickness concrete Flat bed, design strength is not less than C20;
B) squeezed into inside country rock using the anchor pole and anchor cable, and the anchor pole and anchor cable is exposed country rock certain length, Length is more than 60mm, to play supporting country rock, plays the purpose of the autonomous bearing capacity of country rock, and it is in order to rear to reserve preseting length The increase laying bar-mat reinforcement, polyester fiber net and steel bar mesh shell bracket can be fixed in continuous step;
C) the extension bar-mat reinforcement and polyester fiber net, the bar-mat reinforcement are spread successively using the anchor pole and anchor cable exposed parts It is close to country rock laying, the lap of splice of bar-mat reinforcement is 100-200mm described in per two panels, the polyester fiber net is close to the reinforcing bar Net laying sets, and the lap of splice of polyester fiber net described in per two panels is 100-200mm;
D the steel bar mesh shell bracket) is set up, the skeleton structure of steel bar mesh shell bracket, bar-mat reinforcement and polyester fiber net is formed, And the anchor pole and anchor cable is passed through the steel bar mesh shell bracket;
E) anchor pole and anchor cable sequentially pass through the bar-mat reinforcement, polyester fiber net and steel bar mesh shell bracket, by setting The pallet and nut the anchor pole and anchor cable are fixed on the steel bar mesh shell bracket;
F first concrete spray coating) is poured, with the steel bar mesh shell bracket, polyester fiber net and the common structure of bar-mat reinforcement Into armored concrete enclosed construction, initial support is formed, the design strength of first concrete spray coating is not less than C25, thickness It is 150mm;
G) after first concrete spray coating for pouring reaches design strength, answering for second concrete spray coating is carried out Spray, forms secondary supporting, and the design strength of second concrete spray coating is not less than C25, and thickness is 25-100mm.
Further, in step A, F and G, concrete leveling layer, the first concrete spray coating and the second concrete The match ratio of spray-up is cement:Melon seeds piece:Sand:Water=1:2:2:0.45, and mix the accelerator of 2.5% cement consumption.
Further, in the step G, the degree manifested according to deformation of the surrounding rock in tunnel after the step F initial supports is not Together, the multiple spray of the second concrete spray coating is carried out, if roadway deformation gradually tends towards stability, second concrete spray coating is poured Thickness can be 25-50mm, if roadway deformation is still relatively strong, the thickness of second concrete spray coating can be 50-100mm, Complete secondary supporting.
The present invention compared with prior art, has the advantage that with effect and is:
(1) first, squeezed into inside country rock using anchor pole and anchor cable, improve the stability of country rock, immediately lay reinforcing bar Net and polyester fiber net, set up steel bar mesh shell bracket, and pour the first concrete spray coating, complete once supporting, first for pouring The skeleton that concrete spray coating constitutes " steel bar mesh shell bracket+bar-mat reinforcement+polyester fiber net " is completely enclosed, and forms armored concrete Enclosed construction so that total and country rock common eigenvector, effectively prevents wall rock loosening destruction, and subtract surrouding rock deformation speed It is small, discharge part pressure from surrounding rock;
(2) secondly, after the completion of initial support, after the first concrete spray coating for pouring reaches design strength, second is carried out The multiple spray of concrete spray coating, the thickness of the second concrete spray coating of multiple spray is adjusted according to the size of roadway deformation amount, and this kind is applied Work method causes that the support system that initial support is formed plays the appropriate pressure that allows and acts on, and is allowed to certain contractibility, can Bear shifting ground pressure and adopt dynamic load, reach it is soft allow appropriateness, first allow the supporting effect for resist afterwards, pour the second concrete again afterwards and spray Layer, and the thickness that the second concrete spray coating is poured adjusts according to the deformation in tunnel after initial support, completes secondary supporting;
(3) last, steel bar mesh shell bracket, bar-mat reinforcement, polyester fiber net are used as skeleton and the first concrete spray coating and second Concrete spray coating collectively forms armored concrete enclosed construction, the supporting structure system of strength is formed, due in steel bar mesh shell branch A strata ester fiber net is pressed from both sides between frame and bar-mat reinforcement, using the effect of its flexible and release, and, energy good with concrete snap-in force Enough improve concrete tension, the shortcoming of shear resistance difference plays the strong advantage of concrete anti-compression ability, polyester fiber net is by tunnel Two help and top the good release of pressure from surrounding rock, be uniformly distributed in whole support system.
To sum up, the present invention is provided deep-well high stress and soft rock mine roadway composite anchored net Steel bar rack supporting construction and its construction party Method, the anchor pole and anchor cable of setting, first supporting country rock, it is bone then to use " steel bar mesh shell bracket+bar-mat reinforcement+polyester fiber net " The armored concrete enclosed construction of frame, and two-step pouring concrete spray coating.
The polyester fiber net for wherein using be by polyester fiber silk braiding form, with it is lightweight, soft, non-aging, The characteristics of performance is constant after pile things on, at present, has in incorporation bituminous concrete to improve high-temperature stable, flexible, anti-strip and anti-tired The advantages of labor, it is widely used in road engineering.And be made into polyester fiber net and be applied to the rare concern of mine construction, it is made Mesh sheet biaxial tension form mutually perpendicular muscle and rib, mesh sheet has bearing capacity higher in both direction in length and breadth, carries The total bearing capacity of structure high, the fracture of muscle and rib is not easily caused.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing The required accompanying drawing for using in having technology to describe is briefly described, it should be apparent that, drawings in the following description are only Some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work, may be used also Other accompanying drawings are obtained with according to these accompanying drawings.
Fig. 1 is the schematic diagram of deep-well high stress and soft rock mine roadway composite anchored net Steel bar rack supporting construction;
Fig. 2 is the partial structural diagram of deep-well high stress and soft rock mine roadway composite anchored net Steel bar rack supporting construction;
Fig. 3 is steel bar mesh shell bracket structural representation:
(a) steel bar mesh shell bracket sectional drawing, (b) steel bar mesh shell bracket cellular construction figure;
Fig. 4 is the structural representation that bar-mat reinforcement mesh is rectangle;
Fig. 5 is the structural representation that bar-mat reinforcement mesh is rhombus;
Fig. 6 is the structural representation of polyester fiber net.
In figure:10. tunnel, 20. concrete levelings layer, 31. anchor poles, 32. anchor cables, 33. pallets, 34. nuts, 40. reinforcing bars Net, 50. polyester fiber nets, 60. steel bar mesh shell brackets, 71. first concrete spray coatings, 72. second concrete spray coatings
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention In accompanying drawing, clear, complete description is carried out to the technical scheme in the present invention, it is clear that described embodiment be the present invention A part of embodiment, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not having There are the other embodiments made and being obtained under the premise of creative work, belong to protection scope of the present invention.
With reference to accompanying drawing 1 to Fig. 6, the invention will be further described:
As depicted in figs. 1 and 2, deep-well high stress and soft rock mine roadway composite anchored net Steel bar rack supporting construction, including anchor pole 31, Anchor cable 32, bar-mat reinforcement 40, polyester fiber net 50, steel bar mesh shell bracket 60, the first concrete spray coating 71, the second concrete spray coating 72nd, pallet 33 and nut 34.
First, anchor pole 31 and anchor cable 32 are squeezed into inside the country rock of tunnel 10, and exposes certain length, using the part exposed Paving hangs bar-mat reinforcement 40 and polyester fiber net 50 successively, and bar-mat reinforcement 40 is close to country rock laying, and polyester fiber net 50 is close to bar-mat reinforcement 40 Laying, then sets up steel bar mesh shell bracket 60, and anchor pole 31 and anchor cable 32 sequentially pass through bar-mat reinforcement 40, polyester fiber net 50, reinforcing bar Reticulated shell support 60 is simultaneously fixed on steel bar mesh shell bracket 60 by pallet 33 and nut 34, is poured the first concrete spray coating 71 and is closed Whole supporting construction, completes initial support, after the first concrete spray coating 71 reaches design strength, finally pours the second concrete Spray-up 72, completes secondary supporting, forms deep-well high stress and soft rock mine roadway composite anchored net Steel bar rack supporting construction.
It is illustrated in figure 3 the structural representation of steel bar mesh shell bracket 60, including the sectional drawing of (a) steel bar mesh shell bracket 60 and (b) The cellular construction figure of steel bar mesh shell bracket 60, is illustrated in figure 4 the structural representation that the mesh of bar-mat reinforcement 40 is rectangle, as shown in Figure 5 For the mesh of bar-mat reinforcement 40 is the structural representation of rhombus, the structural representation of polyester fiber net 50 is illustrated in figure 6.
The construction method of above-mentioned deep-well high stress and soft rock mine roadway composite anchored net Steel bar rack supporting construction is as follows:
Embodiment one, construction method comprises the following steps:
A tunnel 10) is excavated according to the section configuration of tunnel 10 and size, and is looked in the section of tunnel 10 injection 50mm thickness concrete Flat bed 20, concrete leveling layer 20 plays a part of to close country rock, and prevents country rock water swelling, weathering and surface crag from collapsing Fall, reduce the concavo-convex difference on tunnel surface, improve the close property of patch on bar-mat reinforcement 40 and country rock surface, gunite concrete screed-coat 20 it is strong Degree grade is C20, and match ratio is cement:Melon seeds piece:Sand:Water=1:2:2:0.45, and mix the rapid hardening of 2.5% cement consumption Agent;
B anchor pole 31 and the supporting country rock of anchor cable 32) are used, and exposes country rock certain length, exposed length is 60mm, to improve The shearing strength of country rock, strengthens the stability of country rock, and anchor pole used 31 is high-strength prestressed anchor pole, a diameter of Φ 18mm, total length It is 2200mm, spacing is 700mm, and array pitch is 700mm, in quincuncial arrangement, prestressing force is 50kN, and anchor cable 32 is high-strength prestressed Anchor cable, a diameter of Φ 18mm, total length is 6000mm, and in the top layout one in tunnel, two help each arrangement two, i.e. each section Five anchor cables 32 of arrangement, prestressing force is 150kN;
C) extension bar-mat reinforcement 40 and polyester fiber net 50, bar-mat reinforcement 40 are spread successively using the exposed parts of anchor pole 31 and anchor cable 32 It is close to country rock laying, polyester fiber net 50 is close to bar-mat reinforcement 40 and is laid, the length of bar-mat reinforcement 40 is 6m, and width is 2m, bar-mat reinforcement 40 are formed by reinforcement welding, and the spacing of welding is 100mm, a diameter of Φ 8mm of reinforcing bar, per the lap of splice of two panels bar-mat reinforcement 40 It is 100mm, the length of polyester fiber net 50 is 6m, and width is 2m, and polyester fiber net 50 is formed by polyester fiber silk braiding, polyester Filametntary width is 15mm, and the mesh of polyester fiber net 50 is rectangle, and the specification of quadratic mesh is 100mm × 100mm, every two The lap of splice of piece polyester fiber net 50 is 100mm;
D) reinforcement placing reticulated shell support 60, forms the skeleton of steel bar mesh shell bracket 60, bar-mat reinforcement 40 and polyester fiber net 50 Structure, and anchor pole 31 and anchor cable 32 is passed through steel bar mesh shell bracket 60;
E) anchor pole 31 and anchor cable 32 sequentially pass through bar-mat reinforcement 40, polyester fiber net 50 and steel bar mesh shell bracket 60, by setting The pallet 33 and nut 34 put are fixed on steel bar mesh shell bracket 60;
F the first concrete spray coating 71) is poured, country rock and steel bar mesh shell bracket 60 is completely enclosed, with steel bar mesh shell bracket 60th, polyester fiber net 50 and bar-mat reinforcement 40 collectively form armored concrete enclosed construction, form initial support, the spray of the first concrete The design strength of layer 71 is C25, and match ratio is cement:Melon seeds piece:Sand:Water=1:2:2:0.45, and mix 2.5% cement use The accelerator of amount, thickness is 150mm;
G) after the first concrete spray coating 71 for pouring reaches design strength, the multiple spray of the second concrete spray coating 72 is carried out, Design strength is C25, and match ratio is cement:Melon seeds piece:Sand:Water=1:2:2:0.45, and mix the speed of 2.5% cement consumption Solidifying agent, thickness is 25mm.
In above-mentioned deep-well high stress and soft rock mine roadway composite anchored net Steel bar rack supporting construction and its construction method, the anchor of setting Bar 31 and anchor cable 32 sequentially pass through bar-mat reinforcement 40, polyester fiber net 50 and Steel bar rack 60, and are fixed with pallet 33 and nut 34 In on steel bar mesh shell bracket 60, with the first concrete spray coating of after-pouring 71, after the first concrete spray coating 71 reaches design strength, The second concrete spray coating 72 is poured again.
Anchor pole 31 and anchor cable 32 are squeezed into inside country rock, and the stability of country rock is improve first, thereafter, bar-mat reinforcement 40, polyester Fleece 50, the concrete spray coating 71 of steel bar mesh shell bracket 60 and first collectively form initial support so that whole supporting construction and Country rock common eigenvector, discharges part pressure from surrounding rock, plays the appropriate pressure that allows and acts on, can reach it is soft allow appropriateness, first allow what is resisted afterwards Supporting effect.
After the completion of initial support, treat that the first concrete spray coating 71 reaches design strength, pour the second concrete spray coating 72, shape It is different according to the degree that surrouding rock deformation after initial support manifests into secondary supporting, the multiple spray of the second concrete spray coating 72 is carried out, such as Fruit roadway deformation gradually tends towards stability, and the thickness of the second concrete spray coating 72 can be 25-50mm, if roadway deformation still compared with By force, the thickness of the second concrete spray coating 72 can be 50-100mm, complete secondary supporting.
The mesh of above-mentioned bar-mat reinforcement 40 is rhombus or rectangle, and the mesh of further preferred bar-mat reinforcement 40 is rhombus, rhombus Compared to rectangle, preferably, twine is hinged its globality mesh, is difficult to slide dislocation, and preferably, mesh size is not variable for stability Greatly, bearing capacity is of a relatively high, and ultimate strength and deflection are also higher.
Above-mentioned polyester fiber net 50 is formed by polyester fiber silk braiding, with lightweight, soft, non-aging, is buried The characteristics of performance is constant after pressure, the mesh sheet biaxial tension being made forms mutually perpendicular muscle and rib so that mesh sheet structure is being pressurized When, the pressure for bearing effectively passes to the muscle and rib of surrounding by node, and mesh sheet has carrying higher in both direction in length and breadth Ability, improves the overall bearing capacity of structure, and the fracture of muscle and rib is not easily caused.
Bar-mat reinforcement 40, polyester fiber net 50, steel bar mesh shell bracket 60 and concrete spray coating therebetween form the branch of strength Protection structure system, because centre has pressed from both sides a strata ester fiber net 50, makes full use of its flexible and release to act on, and stung with concrete With joint efforts well, concrete tension, the shortcoming of shear resistance difference can be improved, the strong advantage of concrete anti-compression ability is played, polyester is fine The good release of roadway surrounding rock pressure is uniformly distributed in whole support system by dimension net 50.
Embodiment two:
Anchor pole 31 is high-strength prestressed anchor pole, and a diameter of Φ 22mm, total length is 2800mm, and spacing is 700mm, and array pitch is 700mm, in quincuncial arrangement, prestressing force is 70kN, and anchor cable 32 is high-strength prestressed anchor cable, a diameter of Φ 22mm, and total length is 8000mm, prestressing force is 180kN, and the length of bar-mat reinforcement 40 is 12m, and width is 5m, is formed by reinforcement welding, and the spacing of welding is 200mm, a diameter of Φ 22mm of reinforcing bar, the lap of splice per two panels bar-mat reinforcement 40 is 200mm, and the length of polyester fiber net 50 is 12m, width is 5m, is formed by polyester fiber silk braiding, and the width of polyester fiber silk is 15mm, and the mesh of polyester fiber net 50 is Rectangle, the specification of quadratic mesh is 200mm × 200mm, and the lap of splice per two panels polyester fiber net 50 is 200mm, concrete The design strength of screed-coat 20 is C20, and the design strength of the first concrete spray coating 71 and the second concrete spray coating 72 is C25, three The match ratio of person is cement:Melon seeds piece:Sand:Water=1:2:2:0.45, and the accelerator of 2.5% cement consumption is mixed, its In the thickness of the first concrete spray coating 71 be 150mm, the thickness of the second concrete spray coating 72 is 100mm.
Remaining construction method, step and relevant parameter are identical with embodiment one.
Embodiment three:
Anchor pole 31 is high-strength prestressed anchor pole, and a diameter of Φ 20mm, total length is 2500mm, and spacing is 700mm, and array pitch is 700mm, in quincuncial arrangement, prestressing force is 60kN, and anchor cable 32 is high-strength prestressed anchor cable, a diameter of Φ 20mm, and total length is 8000mm, prestressing force is 180kN, and the length of bar-mat reinforcement 40 is 10m, and width is 4m, is formed by reinforcement welding, and the spacing of welding is 150mm, a diameter of Φ 20mm of reinforcing bar, the lap of splice per two panels bar-mat reinforcement 40 is 150mm, and the length of polyester fiber net 50 is 10m, width is 4m, is formed by polyester fiber silk braiding, and the width of polyester fiber silk is 15mm, and the mesh of polyester fiber net 50 is Rectangle, the specification of quadratic mesh is 150mm × 150mm, and the lap of splice per two panels polyester fiber net 50 is 150mm, concrete The design strength of screed-coat 20 is C20, and the design strength of the first concrete spray coating 71 and the second concrete spray coating 72 is C25, three It is cement that the match ratio of person is:Melon seeds piece:Sand:Water=1:2:2:0.45, and the accelerator of 2.5% cement consumption is mixed, Wherein the thickness of the first concrete spray coating 71 is 150mm, and the thickness of the second concrete spray coating 72 is 50mm.
Remaining construction method, step and relevant parameter are identical with embodiment one.
It should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations, although ginseng The present invention is described in detail according to previous embodiment, those of ordinary skill in the art should be understood:It still can be right Technical scheme described in foregoing embodiments is modified, or carries out equivalent to some technical characteristics therein, and These modifications are replaced, and do not make the spirit and model of the essence disengaging various embodiments of the present invention technical scheme of appropriate technical solution Enclose.

Claims (6)

1. deep-well high stress and soft rock mine roadway composite anchored net Steel bar rack supporting construction and its construction method, it is characterised in that including Anchor pole (31), anchor cable (32), bar-mat reinforcement (40), polyester fiber net (50), steel bar mesh shell bracket (60), the first concrete spray coating (71), the second concrete spray coating (72), pallet (33) and nut (34), the anchor pole (31) and anchor cable (32) first squeezed into and enclosed Inside rock, the extension bar-mat reinforcement (40) is spread successively followed by the exposed parts of the anchor pole (31) and anchor cable (32) and polyester is fine Dimension net (50), the bar-mat reinforcement (40) is close to country rock laying, and the polyester fiber net (50) is close to the bar-mat reinforcement (40) laying, The steel bar mesh shell bracket (60) is set up again, and the anchor pole (31) and anchor cable (32) sequentially pass through the bar-mat reinforcement (40), polyester Fleece (50) and steel bar mesh shell bracket (60) are simultaneously fixed on the steel bar mesh shell branch by the pallet (33) and nut (34) On frame (60), pour first concrete spray coating (71) and close whole supporting construction, complete initial support, finally pour described Second concrete spray coating (72), completes secondary supporting, forms deep-well high stress and soft rock mine roadway composite anchored net Steel bar rack supporting knot Structure.
2. deep-well high stress and soft rock mine roadway composite anchored net Steel bar rack supporting construction according to claim 1 and its construction party Method, it is characterised in that the anchor pole (31) is high-strength prestressed anchor pole, a diameter of Φ 18-22mm, and length is 2200-2800mm, Spacing is 700mm, and array pitch is 700mm, and prestressing force is 50-70kN, and the anchor cable (32) is high-strength prestressed anchor cable, a diameter of Φ 18-22mm, length is 6000-8000mm, and prestressing force is not less than 150kN.
3. deep-well high stress and soft rock mine roadway composite anchored net Steel bar rack supporting construction according to claim 1 and its construction party Method, it is characterised in that the length of the bar-mat reinforcement (40) is 6-12m, and width is 2-5m, and the bar-mat reinforcement (40) is by reinforcement welding Form, the spacing of welding is 100mm, 150mm or 200mm, a diameter of Φ 8-22mm of the reinforcing bar, the bar-mat reinforcement (40) Mesh is rectangle or rhombus.
4. deep-well high stress and soft rock mine roadway composite anchored net Steel bar rack supporting construction according to claim 1 and its construction party Method, it is characterised in that the length of the polyester fiber net (50) be 6-12m, width is 2-5m, the polyester fiber net (50) by Polyester fiber silk braiding is formed, and the width of the polyester fiber silk is 15mm, and the mesh of the polyester fiber net (50) is rectangle, The specification of the quadratic mesh is 100mm × 100mm, 150mm × 150mm or 200mm × 200mm.
5. deep-well high stress and soft rock mine roadway composite anchored net Steel bar rack supporting construction according to claim 1 and its construction party Method, it is characterised in that the construction method comprises the following steps:
A the section configuration and size for) being designed according to tunnel (10) excavate tunnel (10), and thick in tunnel (10) section injection 50mm Concrete leveling layer (20), design strength is not less than C20;
B) squeezed into inside country rock using the anchor pole (31) and anchor cable (32), and expose the anchor pole (31) and anchor cable (32) and enclosed Rock certain length, length is more than 60mm;
C) the extension bar-mat reinforcement (40) and polyester fiber net are spread successively using the anchor pole (31) and anchor cable (32) exposed parts (50), the bar-mat reinforcement (40) is close to country rock laying, and the lap of splice of bar-mat reinforcement (40) described in per two panels is 100-200mm, institute State polyester fiber net (50) and be close to the bar-mat reinforcement (40) laying, the lap of splice of polyester fiber net (50) is described in per two panels 100-200mm;
D the steel bar mesh shell bracket (60)) is set up, steel bar mesh shell bracket (60), bar-mat reinforcement (40) and polyester fiber net is formed (50) skeleton structure, and make the anchor pole (31) and anchor cable (32) through the steel bar mesh shell bracket (60);
E) anchor pole (31) and anchor cable (32) sequentially pass through the bar-mat reinforcement (40), polyester fiber net (50) and steel bar mesh shell branch Frame (60), the reinforcing bar is fixed on by the pallet (33) and nut (34) that set by the anchor pole (31) and anchor cable (32) On reticulated shell support (60);
F first concrete spray coating (71)) is poured, with the steel bar mesh shell bracket (60), polyester fiber net (50) and reinforcing bar Net (40) collectively forms armored concrete enclosed construction, forms initial support, and the design of first concrete spray coating (71) is strong Degree is not less than C25, and thickness is 150mm;
G) after first concrete spray coating (71) for pouring reaches design strength, second concrete spray coating (72) is carried out Multiple spray, form secondary supporting, the design strength of second concrete spray coating (72) is not less than C25, and thickness is 25-100mm.
6. deep-well high stress and soft rock mine roadway composite anchored net Steel bar rack supporting construction according to claim 5 and its construction party Method, it is characterised in that in step A, F and G, concrete leveling layer (20), the first concrete spray coating (71) and second The match ratio of concrete spray coating (72) is cement:Melon seeds piece:Sand:Water=1:2:2:0.45, and mix 2.5% cement consumption Accelerator.
CN201611166999.2A 2016-12-16 2016-12-16 Deep-well high stress and soft rock mine roadway composite anchored net Steel bar rack supporting construction and its construction method Pending CN106761811A (en)

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CN109384439A (en) * 2018-11-29 2019-02-26 长安大学 The high-strength fast gravity die gunite concrete of one kind and soft rock tunnel country rock closed reinforcing method
CN109519174A (en) * 2019-01-09 2019-03-26 东北大学 A kind of shaft wall supporting construction
CN109915172A (en) * 2019-03-20 2019-06-21 中蓝长化工程科技有限公司 Combine leakproof bolt-mesh-spurting supporting and construction method
CN110017150A (en) * 2019-05-05 2019-07-16 西南交通大学 Space networks shell-type shotcrete preliminary bracing structure, tunnel and tunnel support construction method
CN111173549A (en) * 2019-12-31 2020-05-19 太原理工大学 High-ground-stress roadway support device and construction method
CN111255485A (en) * 2020-03-03 2020-06-09 中煤科工集团重庆研究院有限公司 Deep well roadway supporting structure and construction method
CN111577339A (en) * 2020-04-21 2020-08-25 中国建筑股份有限公司 High-ground-stress soft rock tunnel supporting structure system and construction method thereof
CN111878090A (en) * 2020-07-30 2020-11-03 中铁五局集团有限公司 Karst cave section anchor rod construction method based on karst cave underground river environment tunnel construction
CN113027466A (en) * 2021-03-30 2021-06-25 中交一公局集团有限公司 Underground excavation construction process for tunnel with extremely small clear distance
CN113073992A (en) * 2021-04-14 2021-07-06 中钢集团马鞍山矿山研究总院股份有限公司 Roadway supporting method for rock mass containing weak interlayer in underground mine

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CN109384439B (en) * 2018-11-29 2021-06-25 长安大学 High-strength quick-hardening type sprayed concrete and soft rock tunnel surrounding rock sealing and reinforcing method
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CN111173549B (en) * 2019-12-31 2021-03-30 太原理工大学 High-ground-stress roadway support device and construction method
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CN111577339A (en) * 2020-04-21 2020-08-25 中国建筑股份有限公司 High-ground-stress soft rock tunnel supporting structure system and construction method thereof
CN111577339B (en) * 2020-04-21 2021-09-28 中国建筑股份有限公司 High-ground-stress soft rock tunnel supporting structure system and construction method thereof
CN111878090A (en) * 2020-07-30 2020-11-03 中铁五局集团有限公司 Karst cave section anchor rod construction method based on karst cave underground river environment tunnel construction
CN113027466A (en) * 2021-03-30 2021-06-25 中交一公局集团有限公司 Underground excavation construction process for tunnel with extremely small clear distance
CN113073992A (en) * 2021-04-14 2021-07-06 中钢集团马鞍山矿山研究总院股份有限公司 Roadway supporting method for rock mass containing weak interlayer in underground mine

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Application publication date: 20170531