CN103452569A - Large-section chamber supporting method - Google Patents
Large-section chamber supporting method Download PDFInfo
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- CN103452569A CN103452569A CN2013104529522A CN201310452952A CN103452569A CN 103452569 A CN103452569 A CN 103452569A CN 2013104529522 A CN2013104529522 A CN 2013104529522A CN 201310452952 A CN201310452952 A CN 201310452952A CN 103452569 A CN103452569 A CN 103452569A
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Abstract
The invention discloses a large-section chamber supporting method including successive steps of tunneling according to the required length by means of smooth blasting at the position, between the top and the portion 2.5-3.5mm below the top in the height direction of a target chamber and at the center in the width direction of the target chamber, spraying concrete once tunneling, and supporting through a first anchor net layer, wherein the tunneling width is 2.5-3.5m and the tunneling speed is 2-2.5m/time; performing roof rib expanding, spraying concrete and supporting through the first anchor net layer once the rib expanding is performed; spraying concrete secondly until the first anchor net layer is covered completely, installing a second anchor net layer, and fixing the second anchor net layer through support plates; spraying concrete thirdly until the second anchor net layer is covered completely so as to form the primary chamber; and finally, blasting the primary chamber according to the required height. By the large-section chamber supporting method, large-section chambers can be excavated at sections with poor geological conditions, the support strength can be higher than C25, while simple construction, operational safety, high efficiency and material economization are achieved.
Description
Technical field
The present invention relates to a kind of large-section underground supporting method.
Background technology
The down-hole chamber of underground mine generally all needs supporting, and the chamber of the specific function of especially large section has special requirement to supporting intensity.The rock stratum driving large-section underground general traditional supporting method poor at geological conditions has concrete to build arch method, U-shaped steel bracket method, anchor pole or the combined supporting methods such as cable bolting method, shotcrete or anchor and spray net.
But above-mentioned supporting method exists, and cost is high, difficulty of construction is large, can't immediate support, the supporting intensity defect that can not meet the demands, easily cause the chamber distortion to cave in, bring difficulty to the later maintenance of chamber.
Summary of the invention
The purpose of this invention is to provide a kind of large-section underground supporting method.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is as follows:
A kind of large-section underground supporting method comprises the following steps that order is joined:
A, at target chamber short transverse upper top to top between following 2.5-3.5m, and the position of central authorities on width, adopt smooth blasting to tunnel to Len req, the driving width is 2.5-3.5m, driving speed is 2-2.5m/ time, every driving once sprays concrete once, tunnel to after Len req to carrying out the first floor bolting with wire mesh;
B, top board expand side, hocket to required width and length in left and right, every expansion side once spray concrete once, the first floor bolting with wire mesh once;
C, spray concrete for the second time and be all covered to first floor anchor net, the first floor bolting with wire mesh comprises first floor anchor net and anchor pole, while spraying concrete for the second time, the anchor pole head is wrapped up with overcoat;
The overcoat of D, dismounting anchor pole head, install second layer anchor net, and with pallet, second layer anchor net fixed;
E, spray concrete to second layer anchor net for the third time and be all covered, obtain and just become chamber;
F, just becoming the chamber bottom to bottom between following 2.5-3.5m, and the position of central authorities on width, adopt explosion to tunnel to Len req, and the driving width is 2.5-3.5m, driving speed is 2-2.5m/ time, and then side is alternately expanded to the width identical with first one-tenth chamber in left and right;
G, repeating step F, to target chamber desired height, obtain.
In above-mentioned steps B, spray concrete while expanding side and first floor bolting with wire mesh all need with steps A in spray concrete and first floor bolting with wire mesh seamlessly transit, the spray concrete that is steps A and step B forms the integral body seamlessly transit, steps A and step B the first floor bolting with wire mesh form the integral body seamlessly transitted.Above-mentioned multilayer anchor net shares a set of anchor pole, cost-saving, and stabilized structure.
In above-mentioned steps D, pallet fixedly the time, preferably adopts hexagonal cast steel to add high nut.
More than the width of employing said method large-section underground can be accomplished 12m, height can be determined arbitrarily as required.
Said method employing layering and zoning section is excavated, and from top to bottom, from the close-by examples to those far off protrusive tunnels, and top board exposes little, takes with digging with propping up, and the immediate support top board, seal country rock.
Adopt said method, location excavation large-section underground that can be poor at geological conditions, more than prop intensity can reach C25.
In steps A, spray concrete thickness is 45-55mm.Can further guarantee the intensity of supporting like this.
In steps A, also can every driving once spray concrete once, the first floor bolting with wire mesh once.Also can tunnel as mentioned above to Len req disposable first floor bolting with wire mesh.
In step B, while expanding side, width is 2.5-3.5m/ time, and length direction is 2-2.5m/ time.Can, when guaranteeing drivage efficiency, guarantee the safety of operation like this.
In step C, spraying for the second time concrete thickness is 65-75mm.Can further guarantee the intensity of supporting like this.
In step e, spraying for the third time concrete thickness is 75-85mm.Can further guarantee the intensity of supporting like this.
Described anchor pole is preferably without vertical side of body high-strength screw-thread steel formula resin anchor, and material quality of bolt is 20MnSi.MSGLW-335/20 * 3000 more preferably.
The Anchor Agent that the first floor bolting with wire mesh adopts is preferably k2335 type resin anchoring agent.
In step D, pallet is formed for the Q235 steel plate punched of 8mm by thick.Preferably strike out the butterfly iron plate of 120*120mm, can further guarantee like this stability of prop.
First floor anchor net and second layer anchor net all are preferably: the cold rolled reinforcing bar point that diameter is 8mm is welded into the wire lath of 100mm*100mm grid.In the material of not wasting, guaranteed the intensity of prop like this.
The NM technology of the present invention is prior art.
Large-section underground supporting method of the present invention has been combined into an organic whole by country rock, reinforcing bar and concrete, effectively prevented the scar distortion, location excavation large-section underground that can be poor at geological conditions, more than the chamber width can be accomplished 12m, more than prop intensity can reach C25.And construction is simple, and job safety, be conducive to save material, improve supporting efficiency.
The accompanying drawing explanation
The structural representation that Fig. 1 is embodiment 1 gained large-section underground;
The right view that Fig. 2 is Fig. 1;
The A-A that Fig. 3 is Fig. 2 is to zoomed-in view.
In figure, 1 is bolthole, and 2 is anchor pole, and 3 is crag, and 4 is the first spray concrete layer, and 5 is the first anchor stratum reticulare, and 6 is the second spray concrete layer, and 7 is the second anchor stratum reticulare, and 8 is the 3rd spray concrete layer, and 9 is nut.
The specific embodiment
In order to understand better the present invention, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to the following examples.
The supporting method of the large-section underground at meter level place, down-hole ± 0 as shown in Figure 1-2 comprises the following steps that order is joined:
A, at target chamber short transverse upper top to top between following 3m, and the position of central authorities on width, adopt the smooth blasting driving to 12 meters long, the driving width is 3, driving speed is 2.2m/ time, every driving once sprays concrete once, and spray concrete thickness is 50mm, tunnel to after Len req to carrying out the first floor bolting with wire mesh;
B, top board expand side, hocket to 12 meters wide and 12 meters long in left and right, every expansion help once to spray concrete once, the first floor bolting with wire mesh once; While expanding side, width is 3m/ time, and length direction is 2.2m/ time; When spray concrete and first floor bolting with wire mesh, to guarantee to seamlessly transit with steps A;
C, spray concrete to first floor anchor net for the second time and be all covered, spraying for the second time concrete thickness is 70mm, and the first floor bolting with wire mesh comprises first floor anchor net and anchor pole, while spraying concrete for the second time, the anchor pole head is wrapped up with bag of cement;
The bag of cement of D, dismounting anchor pole head, install second layer anchor net, and with pallet, second layer anchor net fixed;
E, spray concrete to second layer anchor net for the third time and be all covered, obtain and just become chamber, spraying for the third time concrete thickness is 80mm;
F, just becoming the chamber bottom to bottom between following 3m, and the position of central authorities on width, adopting explosion to tunnel to Len req, driving width is 3m, and driving speed is 2.2m/ time, and then left and right is alternately expanded and helped the extremely width identical with first one-tenth chamber;
G, repeating step F, be that 9.5m is high to the target chamber, obtain, and the watering maintenance, gained prop intensity is greater than C25, and prop intensity adopts the large panel forming method of spray to measure the intensity of spraying concrete.
In Fig. 3, spray concrete in steps A, B obtains the first spray concrete layer, and the first floor bolting with wire mesh in steps A, B obtains the first anchor stratum reticulare, and the concrete of spray for the second time in step C obtains the second spray concrete layer, second layer anchor net is installed in step D and is obtained the second anchor stratum reticulare, spray for the third time concrete in step e and obtain the 3rd spray concrete layer.When spray concrete and bolting with wire mesh, at the periphery of chamber, also carry out the supporting same with top.
Above-mentioned anchor pole is that material quality of bolt is 20MnSi without vertical side of body high-strength screw-thread steel formula resin anchor, and model is MSGLW-335/20 * 3000; The Anchor Agent that bolting with wire mesh adopts is k2335 type resin anchoring agent, by the bolthole of MQT-130 jumbolter Drilling φ 28mm, and is installed, and anchor rod pallet board is fixed on the net sheet on the concrete spray plane tightly, and anchor pole exposes 200mm; Pallet for by thick for the Q235 steel plate punched of 8mm forms, be shaped as the butterfly iron plate of 120*120mm, pallet is fixedly the time, employing hexagonal cast steel adds high nut; First floor anchor net and second layer anchor net are: the cold rolled reinforcing bar point that diameter is 8mm is welded into the wire lath of 100mm*100mm grid, and the length of wire lath is 2m, and wide is 1m.
Claims (10)
1. a large-section underground supporting method is characterized in that: comprise the following steps that order is joined:
A, at target chamber short transverse upper top to top between following 2.5-3.5m, and the position of central authorities on width, adopt smooth blasting to tunnel to Len req, the driving width is 2.5-3.5m, driving speed is 2-2.5m/ time, every driving once sprays concrete once, tunnel to after Len req to carrying out the first floor bolting with wire mesh;
B, top board expand side, hocket to required width and length in left and right, every expansion side once spray concrete once, the first floor bolting with wire mesh once;
C, spray concrete for the second time and be all covered to first floor anchor net, the first floor bolting with wire mesh comprises first floor anchor net and anchor pole, while spraying concrete for the second time, the anchor pole head is wrapped up with overcoat;
The overcoat of D, dismounting anchor pole head, install second layer anchor net, and with pallet, second layer anchor net fixed;
E, spray concrete to second layer anchor net for the third time and be all covered, obtain and just become chamber;
F, just becoming the chamber bottom to bottom between following 2.5-3.5m, and the position of central authorities on width, adopt explosion to tunnel to Len req, and the driving width is 2.5-3.5m, driving speed is 2-2.5m/ time, and then side is alternately expanded to the width identical with first one-tenth chamber in left and right;
G, repeating step F, to target chamber desired height, obtain.
2. the method for claim 1 is characterized in that: in steps A, spray concrete thickness is 45-55mm.
3. the method for claim 1 is characterized in that: in steps A, every driving once spray concrete once, the first floor bolting with wire mesh once.
4. the method for claim 1 is characterized in that: in step B, while expanding side, width is 2.5-3.5m/ time, and length direction is 2-2.5m/ time.
5. the method for claim 1, it is characterized in that: in step C, spraying for the second time concrete thickness is 65-75mm.
6. the method for claim 1, it is characterized in that: in step e, spraying for the third time concrete thickness is 75-85mm.
7. as the described method of claim 1-6 any one, it is characterized in that: described anchor pole is for coercing high-strength screw-thread steel formula resin anchor without indulging, and material quality of bolt is 20MnSi.
8. as the described method of claim 1-6 any one, it is characterized in that: the Anchor Agent that the first floor bolting with wire mesh adopts is k2335 type resin anchoring agent.
9. as the described method of claim 1-6 any one, it is characterized in that: in step D, pallet is formed for the Q235 steel plate punched of 8mm by thick.
10. as the described method of claim 1-6 any one, it is characterized in that: first floor anchor net and second layer anchor net are: the cold rolled reinforcing bar point that diameter is 8mm is welded into the wire lath of 100mm*100mm grid.
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| CN201310452952.2A CN103452569B (en) | 2013-09-27 | 2013-09-27 | A kind of large-section underground supporting method |
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| CN201310452952.2A CN103452569B (en) | 2013-09-27 | 2013-09-27 | A kind of large-section underground supporting method |
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| CN103452569B CN103452569B (en) | 2015-09-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105507923A (en) * | 2015-12-29 | 2016-04-20 | 大同煤矿集团有限责任公司 | Bolting-wire mesh-shotcreting support and bolt-cable coupling support integrated supporting method for large-span chamber |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003293439A (en) * | 2002-04-02 | 2003-10-15 | Geostr Corp | Construction method for large-section box culvert |
| JP2004150117A (en) * | 2002-10-30 | 2004-05-27 | Sumikura Kozai Kk | Work execution method for anchor reinforcement for holding concrete reinforcing bar |
| JP2004218352A (en) * | 2003-01-17 | 2004-08-05 | Kajima Corp | Repairing method for separation/falling place of concrete piece |
| CN101509386A (en) * | 2009-03-24 | 2009-08-19 | 于守东 | Composite support anchor rod and construction method thereof |
| CN102635377A (en) * | 2012-03-19 | 2012-08-15 | 新汶矿业集团有限责任公司协庄煤矿 | Tensile reinforcement concrete spray body supporting method for deep soft roadway |
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2013
- 2013-09-27 CN CN201310452952.2A patent/CN103452569B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003293439A (en) * | 2002-04-02 | 2003-10-15 | Geostr Corp | Construction method for large-section box culvert |
| JP2004150117A (en) * | 2002-10-30 | 2004-05-27 | Sumikura Kozai Kk | Work execution method for anchor reinforcement for holding concrete reinforcing bar |
| JP2004218352A (en) * | 2003-01-17 | 2004-08-05 | Kajima Corp | Repairing method for separation/falling place of concrete piece |
| CN101509386A (en) * | 2009-03-24 | 2009-08-19 | 于守东 | Composite support anchor rod and construction method thereof |
| CN102635377A (en) * | 2012-03-19 | 2012-08-15 | 新汶矿业集团有限责任公司协庄煤矿 | Tensile reinforcement concrete spray body supporting method for deep soft roadway |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105507923A (en) * | 2015-12-29 | 2016-04-20 | 大同煤矿集团有限责任公司 | Bolting-wire mesh-shotcreting support and bolt-cable coupling support integrated supporting method for large-span chamber |
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| CN103452569B (en) | 2015-09-23 |
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