CN103670426B - High inclination-angle, large-section roadway construction method - Google Patents

High inclination-angle, large-section roadway construction method Download PDF

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Publication number
CN103670426B
CN103670426B CN201310752192.7A CN201310752192A CN103670426B CN 103670426 B CN103670426 B CN 103670426B CN 201310752192 A CN201310752192 A CN 201310752192A CN 103670426 B CN103670426 B CN 103670426B
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eye
cut
supporting
expand
caunch
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CN201310752192.7A
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Chinese (zh)
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CN103670426A (en
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黄江平
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四川川煤华荣能源股份有限公司花山煤矿
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Abstract

The invention discloses a kind of high inclination-angle, large-section roadway construction method, relate to coal-mining technique field, a kind of construction safety is provided, the high inclination-angle that labour intensity is lower, large-section roadway construction method.High inclination-angle, large-section roadway construction method comprise the steps: that getting first cuts eye and carry out supporting; To first cut eye circulate successively repeatedly caunch, expand side and supporting operation until first cut a total length caunch, expand side and the complete formation of supporting second cut eye; Cut eye to second to circulate successively and carry out expansion side and supporting operation until second cuts total length and expand side and eye is cut in the complete formation of supporting the 3rd; 3rd base plate cutting eye is undercuted.The present invention adopts gradation to expand Bang Sancicheng lane technology, and favourable solving is cut eye and expanded methane accumulation problem, roof timbering safety problem in side construction, also reduces labour intensity, for site operation creates advantage simultaneously.

Description

High inclination-angle, large-section roadway construction method

Technical field

The present invention relates to coal-mining technique field, particularly relate to a kind of high inclination-angle, large-section roadway construction method.

Background technology

Current, during applicant mines and produces, institute dig and send that to cut eye all wide at 2.4m, and 2m is high, and finally expand and help the section of formation wide at 6m, 2m is high, due to section median size, so be mostly to adopt once Kuo Bangcheng lane technology to construct when expansion is helped.According to the needs solving productivity and development, the feature that applicant exploits for thick coal seam, determine that the large-scale support of employing realizes high inclination-angle, the head of full-mechanized mining face in thick coal seam full-seam mining adopts target, realize this goal, the successful formation of high inclination-angle, large section open*.off is one of key link, after needing to cut the construction of eye expansion side, width reaches 10m, and be highly not less than 4.2m, basal area 42m is sent in its pick 2.Be all previous pick send highly the highest in incisor canal, span is maximum, section is maximum cuts eye.

Summary of the invention

Technical problem to be solved by this invention is: provide a kind of construction safety, the high inclination-angle that labour intensity is lower, large-section roadway construction method.

For solving the problems of the technologies described above adopted technical scheme be: high inclination-angle, large-section roadway construction method, is characterized in that comprising the steps:

A, to stay top coal construction to get first the end of along by simultaneous drifting mode to cut eye; First to cut a cross section be rectangle, width 2.4m, height 2.4m; Cut eye to first and carry out supporting, the first top board cutting eye adopts anchor cable and anchor pole, steel bar joist frame and wire lath combined supporting;

B, to cut first eye circulate successively repeatedly caunch, expand side and supporting operation until first cut a total length caunch, expand side and supporting complete, the length of caunch at every turn, expand side and supporting is 1m; Caunching, to cut eye height to first be 4.2 meters; It is 5.4m that a width is cut to first by expansion side, expands in side process and retains the thick ground coal of 1.0-1.2m; Support pattern arranges the supporting of brachymedial post for adopting anchor cable and anchor pole, steel bar joist frame and wire lath combined supporting and cutting in the middle part of eye first; First cut eye caunch, expand side and supporting complete after formation second cut eye;

C, cleaning second are cut intraocular and are caunched, expand and help the foreign material that drop;

D, to cut eye to second and circulate successively and carry out expansion side and supporting operation, until second cut a total length expand side and supporting complete, each expansion is helped and the length of supporting is 1m; It is 10m that a width is cut to second by expansion side, expands in side process and retains the thick ground coal of 1.0-1.2m; Support pattern arranges the supporting of brachymedial post for adopting anchor cable and anchor pole, steel bar joist frame and wire lath combined supporting and cutting in the middle part of eye second; Second cut eye expand side and supporting complete after formation the 3rd cut eye;

E, cleaning the 3rd are cut intraocular and are expanded the foreign material helping to drop;

F, the 3rd base plate cutting eye undercuted and cuts eye to the 3rd and be all highly 4.2 meters;

G, brachymedial post is replaced by long center pillar, long center pillar has been held concurrently the effect of beacon.

The invention has the beneficial effects as follows: this time eye is cut in construction is high inclination-angle, large section roadway, for applicant constructs trial first.Adopt gradation to expand Bang Sancicheng lane technology, favourable solving is cut eye and is expanded methane accumulation problem, roof timbering safety problem in side construction, also reduces labour intensity, for site operation creates advantage simultaneously.

Accompanying drawing explanation

Fig. 1 first cuts a cross-sectional structure schematic diagram;

Fig. 2 first cuts ramus ophthalmicus protection structure schematic diagram;

Fig. 3 first cuts ramus ophthalmicus protection structure schematic diagram;

Fig. 4 second cuts a cross-sectional structure schematic diagram;

Fig. 5 second cuts ramus ophthalmicus protection structure schematic diagram;

Fig. 6 the 3rd cuts cross-sectional structure schematic diagram when eye does not undercut;

Fig. 7 the 3rd cuts supporting and protection structure schematic diagram when eye does not undercut;

Fig. 8 be the 3rd cut eye undercut after cross-sectional structure schematic diagram;

Fig. 9 be the 3rd cut eye undercut after supporting and protection structure schematic diagram;

Be labeled as in figure: first cuts eye 1, steel bar joist frame 2, anchor cable and anchor pole 3, wire lath 4, second cuts eye 5, brachymedial post 6, ground coal 7, the 3rd cut eye 8, long center pillar 9.

Detailed description of the invention

Below in conjunction with the drawings and specific embodiments, the present invention is further described

High inclination-angle, large-section roadway construction method, is characterized in that comprising the steps:

A, to stay top coal construction to get first the end of along by simultaneous drifting mode to cut eye 1; First to cut eye 1 cross section be rectangle, width 2.4m, height 2.4m; Cut eye 1 to first and carry out supporting, first cuts eye 1 top board adopts anchor cable and anchor pole 3, steel bar joist frame 2 and wire lath 4 combined supporting; First cuts eye 1 cross-sectional structure as shown in Figure 1; First cuts eye 1 supporting and protection structure as shown in Figure 2 and Figure 3.

B, to cut first eye 1 circulate successively repeatedly caunch, expand side and supporting operation until first cut eye 1 total length caunch, expand side and supporting complete, the length of caunch at every turn, expand side and supporting is 1m; Caunch and cut eye 1 to first and be highly 4.2 meters; It is 5.4m that eye 1 width is cut to first by expansion side, expands in side process and retains the thick ground coal 7 of 1.0-1.2m; Support pattern arranges brachymedial post 6 supporting for adopting anchor cable and anchor pole 3, steel bar joist frame 2 and wire lath 4 combined supporting and cutting in the middle part of eye 1 first; First cut eye 1 caunch, expand side and supporting complete after formation second cut eye 5; Second cuts eye 5 cross-sectional structure as shown in Figure 4, and second cuts eye 5 supporting and protection structure as shown in Figure 5.

C, cleaning second are cut in eye 5 and are caunched, expand and help the foreign material that drop;

D, to cut eye 5 to second and circulate successively and carry out expansion side and supporting operation, until second cut eye 5 total length expand side and supporting complete, each expansion is helped and the length of supporting is 1m; It is 10m that eye 5 width is cut to second by expansion side, expands in side process and retains the thick ground coal 7 of 1.0-1.2m; Support pattern arranges brachymedial post 6 supporting for adopting anchor cable and anchor pole 3, steel bar joist frame 2 and wire lath 4 combined supporting and cutting in the middle part of eye 5 second; Second cut eye 5 expand side and supporting complete after formation the 3rd cut eye 8; 3rd cuts eye 8 cross-sectional structure as shown in Figure 6, and the 3rd cuts eye 8 supporting and protection structure as shown in Figure 7.

The foreign material expanding and help to drop are cut in eye 8 in E, cleaning the 3rd;

F, the 3rd base plate cutting eye 8 undercuted and cuts eye 8 to the 3rd and be all highly 4.2 meters;

G, brachymedial post 6 is replaced by long center pillar 9, long center pillar 9 has been held concurrently the effect of beacon.Cut the final cross-sectional structure of eye, cut the final supporting and protection structure of eye as shown in Figure 9.

Cleaning side top float stone, umbrella eaves should be noted before each supporting.

This time eye is cut in construction is high inclination-angle, large section roadway, for applicant constructs trial first.Adopt gradation to expand Bang Sancicheng lane technology, favourable solving is cut eye and is expanded methane accumulation problem, roof timbering safety problem in side construction, also reduces labour intensity, for site operation creates advantage simultaneously.

Namely this method can be applicable to that 10m is wide, 4.2m is high cuts eye, and what also can be applicable to other close sizes of size cuts eye.

Supporting and protection structure parameter determination mode is as follows:

This face timbering design is determined by suspensory theory and wall rock loosening ring classification:

1) rock-bolt length is determined:

(1) by coal geology block diagram and table look-up and know that this roof country rock belongs to the general stabilizing surrounding rock of III class, its relaxation zone value is 1.0 ~ 1.5, according to surrounding rock loose circle theory, when relaxation zone thickness L=0.4 ~ 1.5, be called middle relaxation zone, now, the broken expansive force of country rock is obvious, L value is generally less than conventional rock-bolt length, therefore can adopt suspensory theory in design.Rock-bolt length design formulas is:

L=kh+L 1+L 2

L-rock-bolt length in formula, m;

K-is safety factor, generally according to significance level and the length of service in tunnel, gets k=1 ~ 2.5; (consider the factor that incisor canal roof span is large, safety factor gets 2)

Unstable coal (rock) layer thickness of h-, m;

L 1-anchor pole protruded length, m, general value 0.1m;

L 2-anchor pole anchors into stable formation depth, and m generally gets 0.3 ~ 0.4m.

Calculate, rock-bolt length L=1.9m.

(2) according to coal road face roof Supporting Theory of Broken Rock Zone formula L=N (1.5+W/10)

L-rock-bolt length in formula, m;

N-is safety factor, gets 1

W – tunnel span, m;

Calculate, rock-bolt length L=2.4m.

Actual in conjunction with this tunnel, finally determine that rock-bolt length gets maximum value 2.4m.

2) between anchor pole, array pitch calculating formula is

D ≤ Q γ L p

In formula: between D---anchor pole, array pitch, m;

Q---Soil Anchor Design anchored force, kN;

The unit weight of γ-country rock, kN/m 3.

Soil Anchor Design anchored force is 60kN, and the unit weight of country rock is 25kN/m 3, wall rock loosening ring value is 150cm, and substitution above formula calculates between anchor pole, array pitch D≤1.26m.To consider in practice that the large and anchor-holding force of anchor bolt of top board construction span does not reach designing requirement, therefore for guaranteeing construction safety, between anchor pole, array pitch value is 1.0m.

3) determination of bolt diameter

(1) computational methods 1

Φ = k 4 Q / ( πδ 3 )

In formula: Φ-bolt diameter;

Q-anchor-holding force of anchor bolt: generally get 70KN-60KN according to engineering analog method;

δ 3-A3 steel tensile strength, gets 380Mpa according to material quality of bolt;

K-redundancy, gets 1.3;

Can obtain thus:

Φ = 1.3 4 × 0.06 / ( 3.14 × 380 ) = 0.018 m

Trying to achieve bolt diameter is 18mm.

(2) computational methods 2

d = 1 110 L

D-bolt diameter, mm;

L-rock-bolt length, mm.

Can obtain thus: bolt diameter d=22mm.Consider that in actual supporting, anchor pole and anchor cable carry out intersecting setting, determine to adopt common termination anchoring bolt.

(1), anchor pole specification: roofbolt adopts common termination anchoring bolt, anchored force>=60KN; For complement corner hangs top anchor pole after tail side caunches, can adopt threaded anchor rod.

(2), anchor network planning lattice: top board and side anchor net adopt diamond mesh, and mesh: 40mm × 40mm, nets wide 1.0m.

(3), bolt interval: top board: 1.0m × 1.0m; Coal is helped: anti-side is array pitch supporting between first time construction is cut at the moment by 1.0m × 1.0m, and this time construction is caunched after operation to former eye of cutting, and can help supporting to be connected in roof timbering and original coal, formation entirety; Just helping to adopt and setting being connected of hanging that drift angle anchor pole and base plate chock eye carry out netting, the spacing of anchor pole and chock eye is 1m, and medium position can be selected to add on hard coal or bastard coal and beat timber wedge fixed network.

(4), Anchor Agent: adopt K2360 type Anchor Agent, each one of side top.

(5), anchor pole aperture:

5.2.2 cable bolting parameter:

(1), anchor cable specification: anchor cable is selected steel strand, anchored force>=180KN.

(2), cable bolting length: anchor cable length is that master determines with suspension function

L=L 1﹢L 2﹢L 3=4.96m

In formula: the total length of L-anchor cable, m;

L 1the anchorage length that-anchor cable is deep into stable rock stratum gets 1.5m;

L 2-false roof and immediate roof thickness, known according to coal (rock) block diagram is 3.16m;

L 3-stretch-draw the length that need expose, is generally 0.3m.

(3), anchor cable length is not less than 1/2 of tunnel span according to the rules.

Therefore determining that anchor cable length is: 5.3m, is 9m according to the last width of incisor canal, can consider that two (or an anchor cable) extended length by being arranged in the middle of back are 7.3m.

(4), Anchor Agent: adopt K2360 type Anchor Agent, diameter: 23 ㎜, length: 600 ㎜, two, every hole.

(5), anchor cable aperture:

(6), anchor cable is arranged: anchor cable and back are 75 ° ~ 90 ° angles, an array pitch 2m × 2m, and intersection sets; Consider and cut eye all to have expanded rear roof span larger, and roof timbering does not possess integrality after gradation expansion side, after secondary expansion has been helped, complete reinforce support is carried out once to top board, between anchor cable, array pitch is 2m × 2m, anchor cable length sets after inspecting hole eye is grasped Roof rock feature according to scene to be determined, and clear and definite in supplementary measure.

(7), joist frame: consider that roof span is large, joist frame adopts round steel is processed.

(8), roof toad calculates

Minimum Breaking load: 240.2kN.

Safety factor: 1.4

Fractional load held by anchor cable:

P1=(28kN/m 3× 1m × 3.16m × 1m)+(14kN/m 3× 1m × 0 × 1m)=88.48kN, every square metre of pressure is 88.48kN ÷ (1m × 1m)=88.48kN/m 2

According to the known every square metre of anchor cable of supporting schematic diagram be: 11/18m 2=0.61/m 2.

Then every square metre of anchor cable is stressed is: 88.48kN/m 2÷ 0.61/m 2=145kN/ root < (240.2kN ÷ 1.4)=171.57kN, can not be disrumpent feelings.

Argillaceous siltstoue compressive strength is 40MPa.Anchor cable just anchor-hold is 36MPa<40MPa, and rock stratum can not be broken.

Claims (1)

1. high inclination-angle, large-section roadway construction method, is characterized in that comprising the steps:
A, to stay top coal construction to get first the end of along by simultaneous drifting mode to cut eye (1); First to cut eye (1) cross section be rectangle, width 2.4m, height 2.4m; Cut eye (1) to first and carry out supporting, the first top board cutting eye (1) adopts anchor cable and anchor pole (3), steel bar joist frame (2) and wire lath (4) combined supporting;
B, to cut first eye (1) circulate successively repeatedly caunch, expand side and supporting operation until first cut eye (1) total length caunch, expand side and supporting complete, the length of caunch at every turn, expand side and supporting is 1m; Caunch and cut eye (1) to first and be highly 4.2 meters; It is 5.4m that eye (1) width is cut to first by expansion side, expands in side process and retains the thick ground coal (7) of 1.0-1.2m; Support pattern arranges brachymedial post (6) supporting for adopting anchor cable and anchor pole (3), steel bar joist frame (2) and wire lath (4) combined supporting and cutting in the middle part of eye (1) first; First cut eye (1) caunch, expand side and supporting complete after formation second cut eye (5);
C, cleaning second are cut in eye (5) and are caunched, expand and help the foreign material that drop;
D, to cut eye (5) to second and circulate successively and carry out expansion side and supporting operation, until second cut eye (5) total length expand side and supporting complete, each expansion is helped and the length of supporting is 1m; It is 10m that eye (5) width is cut to second by expansion side, expands in side process and retains the thick ground coal (7) of 1.0-1.2m; Support pattern arranges brachymedial post (6) supporting for adopting anchor cable and anchor pole (3), steel bar joist frame (2) and wire lath (4) combined supporting and cutting in the middle part of eye (5) second; Second cut eye (5) expand side and supporting complete after formation the 3rd cut eye (8);
The foreign material expanding and help to drop are cut in eye (8) in E, cleaning the 3rd;
F, the base plate cutting eye (8) to the 3rd undercut and cut eye (8) to the 3rd and be all highly 4.2 meters;
G, brachymedial post (6) is replaced by long center pillar (9), long center pillar (9) has been held concurrently the effect of beacon.
CN201310752192.7A 2013-12-31 2013-12-31 High inclination-angle, large-section roadway construction method CN103670426B (en)

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CN105257296A (en) * 2015-10-08 2016-01-20 山西晋城无烟煤矿业集团有限责任公司 Working face through-cut tunneling construction once-tunneling process
CN105484760B (en) * 2016-02-01 2019-05-28 四川川煤华荣能源股份有限公司花山煤矿 Big angle coal face advance support structure
CN106703816A (en) * 2016-12-23 2017-05-24 四川川煤华荣能源股份有限公司 Hole cutting and slope expansion construction technology for fully-mechanized working face of complex coal bed
CN106907153A (en) * 2017-05-02 2017-06-30 中国神华能源股份有限公司 Thin bedrock high-seam working face large section cuts a driving method
CN107654247B (en) * 2017-09-22 2019-04-16 中国矿业大学 A kind of sliding structure area pole loose thick coal layer coal roadway tunneling is met head on anti-top coal leakage method for leakage
CN108104821B (en) * 2017-11-22 2019-12-03 平顶山天安煤业股份有限公司十一矿 Large section open*.off construction and its method for protecting support

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