CN103061779B - Novel mine tunnel supporting structure and construction method thereof - Google Patents
Novel mine tunnel supporting structure and construction method thereof Download PDFInfo
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- CN103061779B CN103061779B CN201210569308.9A CN201210569308A CN103061779B CN 103061779 B CN103061779 B CN 103061779B CN 201210569308 A CN201210569308 A CN 201210569308A CN 103061779 B CN103061779 B CN 103061779B
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Abstract
Provided are a novel mine tunnel supporting structure and a construction method thereof. The novel mine tunnel supporting structure is a multilayer supporting structure composed of a primary support and a secondary support. The secondary support comprises secondary support anchor rods, secondary support reinforcement fabric sheets, profile steel frames and secondary sprayed concrete, the outer sides of the secondary support reinforcement fabric sheets are tightly attached to the primary support, and the inner sides of the secondary support reinforcement fabric sheets are arranged on the profile steel frames along surrounding rocks at intervals. Reinforced rear panels are welded between every two front-and-back adjacent profile steel frames, a plurality of anchor rod hanging rings are welded on each profile steel frame, and the secondary support anchor rods penetrate through the anchor rod hanging rings to anchor the secondary support reinforcement fabric sheets on the surrounding rocks. The secondary support anchor rods, the secondary support reinforcement fabric sheets, the profile steel frames, the reinforced rear panels and the anchor rod hanging rings are integrally formed through the secondary sprayed concrete. According to the novel mine tunnel supporting structure and the construction method thereof, the existing problem of poor integrity between the secondary support anchor rods and the profile steel frames and between the profile steel frames is solved, and the problems of surrounding rock collapsing and supporting structure damage which are apt to happen due to large deformation of the tunnel in weak surrounding rocks in the complicated geological condition are solved.
Description
Technical field
The present invention relates to a kind of tunnel support structure and construction method thereof, particularly a kind of excavate for mining tunnel new
Type tunnel support structure and construction method thereof.
Background technology
After the tunnel excavation of the underground constructions such as mining tunnel, in order effectively retraining and deformation controlling for rock surrounding gateways, to strengthen the stability of country rock, to ensure construction safety, all need to apply necessary supporting and protection structure.Generally be New Austrian Tunneling Method construction for the supporting method in weak broken wall rock location at present, New Austrian Tunneling Method is the abbreviation of new Austrian method for tunnel construction, it is taking the theory of construction of tunnel experience and rock mass mechanics as basis, and anchor pole and sprayed mortar are combined to a kind of construction method as main supporting means.
Combined type supporting is using theory of new Austrian tunnelling method as the modern supporting and protection structure of the one instructing, the main combined bolting and shotcrete that uses is as preliminary bracing, simulation concrete is as a kind of combined support structure of secondary supporting, after generally waiting for after preliminary bracing that the distortion of country rock is basicly stable, then carries out secondary supporting.In combined type construction method for supporting, the main part of the force of initial deformation pressure of country rock is preliminary bracing, but in the time that excavation passes through the soft rock Area cracked of geostatic stress more complicated, because stress release causes country rock bulking deformation, and deflection is large, speed is fast, the duration is of a specified duration, only rely on preliminary bracing to be not enough to suppress the development of surrouding rock deformation, easily there is supporting and destroy cracking, cause serious breakage, unstability causes the also not within minority of the accident of caving in, and needs secondary supporting to bear the later stage country rock deformation pressure of major part.At this moment secondary supporting is no longer just simple buffer structure, bearing load is become to a part of effective support structure of effective reduction surrouding rock stress, so the reinforcement of secondary supporting is to avoid surrounding rock collapse, Support structure damage, bow member that under complex geological condition, Support System in Soft Rock Tunnels large deformation causes the key of problem such as to change.
Current secondary supporting operated by rotary motion has secondary supporting anchor pole, secondary profile steel frame, and secondary supporting reinforced mesh finally sprays second coagulation soil, and between anchor pole and shaped steel frame, between profile steel frame, globality is poor.
Summary of the invention
The object of this invention is to provide a kind of construction method of mining tunnel new supporting structure, solve in current secondary supporting the poor technical problem of globality between anchor pole and profile steel frame, between profile steel frame, solve Support System in Soft Rock Tunnels large deformation under complex geological condition and easily cause the technical problems such as surrounding rock collapse, Support structure damage, bow member change.
For achieving the above object, the present invention adopts following technical scheme:
A kind of mining tunnel new supporting structure, the multilayer supporting and protection structure being formed by preliminary bracing and secondary supporting, wherein secondary supporting comprises secondary supporting anchor pole, secondary supporting reinforced mesh, profile steel frame and secondary injection concrete, preliminary bracing is close in the outside of secondary supporting reinforced mesh, inner side is close to along in the spaced profile steel frame of country rock, before and after be also welded with reinforcement backboard between adjacent two profile steel frame, in each profile steel frame, be all welded with some balancing bands, the internal diameter of described balancing band is greater than the external diameter of the second stage of support anchor rod, second phase support anchor rod is anchored at secondary supporting reinforced mesh on country rock through balancing band, described secondary supporting anchor pole, secondary supporting reinforced mesh, profile steel frame, strengthen backboard and balancing band and form one by secondary injection concrete.Described balancing band can interval be symmetrically welded or interleaved is welded on the both sides of the edge of profile steel frame.
Described preliminary bracing can comprise preliminary bracing anchor pole, preliminary bracing reinforced mesh and initial stage sprayed mortar, wherein preliminary bracing reinforced mesh covers country rock surface, preliminary bracing reinforced mesh is connected and fixed by the preliminary bracing anchor pole anchoring in country rock, and both form one by initial stage sprayed mortar.
Described profile steel frame can be the symmetrical i iron of twin shaft or mono-symmetry i iron.
Described reinforcement backboard can be angle steel, channel-section steel or steel pipe, between the adjacent profile steel frame in every two front and back, arranges more than three.
The concrete thickness of described secondary injection can be 100mm-200mm.
The thickness of described initial stage sprayed mortar can be 30mm-50mm.
Described profile steel frame is arch, between its two bottom, can connect horizontal bottom girder, and profile steel frame is connected to closed-loop structure, and described horizontal bottom girder can be the symmetrical i iron of twin shaft, mono-symmetry i iron or channel-section steel.
The construction method of this mining tunnel new supporting structure, step is as follows:
Step 1, excavation country rock, get rid of after the danger such as loosening sillar, performs preliminary bracing, first with preliminary bracing anchor pole, preliminary bracing reinforced mesh is fixing along country rock surface;
Step 2, supporting reinforced mesh exposed face performs initial stage sprayed mortar in the early stage, by solid to preliminary bracing member and country rock
Fixed integral;
Step 3, perform the second stage of supporting: first by secondary supporting reinforced mesh supporting exposed face location in the early stage;
Step 4, each profile steel frame is located at secondary supporting reinforced mesh exposed face;
Step 5, between two adjacent profile steel frame of front and back welding at least three roads strengthen backboards;
Step 6, at the interval, both sides of the edge of profile steel frame weld anchor bridle ring;
Step 7, mesh and preliminary bracing that secondary supporting anchor pole order is passed to balancing band, secondary supporting reinforced mesh, be anchored at secondary supporting reinforced mesh on country rock;
Step 8, perform secondary injection concrete all support units are connected into entirety.
After described step 4 or step 5, can between two bottoms of described profile steel frame, connect horizontal bottom girder, profile steel frame is connected to closed-loop structure.
Compared with prior art the present invention has following characteristics and beneficial effect:
The present invention arranges the suspension ring of secondary supporting anchor pole in profile steel frame, between profile steel frame, use and strengthen backboard connection, overcome in traditional secondary supporting the poor technical problem of globality between anchor pole and profile steel frame, between profile steel frame, the stressed of whole secondary supporting is consistent, strengthens structural integrity and the supporting capacity to country rock.
The present invention arranges bottom girder in the profile steel frame bottom of both sides, tunnel, and bottom girder connects as one two profile steel frame, has increased the supporting capacity of profile steel frame to country rock.
The invention solves Support System in Soft Rock Tunnels large deformation under complex geological condition and easily cause the technical problems such as surrounding rock collapse, Support structure damage, bow member change, the combined type supporting and protection structure being formed by preliminary bracing and novel secondary supporting, stability and reliability is stronger, it forms an organic whole with broken rock mass around, effectively reduce surrouding rock stress, guaranteed safety and the construction speed of construction.
Brief description of the drawings
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
Fig. 1 is the schematic diagram of supporting and protection structure of the present invention.
Fig. 2 is the partial structurtes schematic diagram of A-A section in tunnel top supporting and protection structure in Fig. 1.
Fig. 3 is the secondary supporting structural representation of tunnel side wall B direction in Fig. 1.
Reference numeral: 1-preliminary bracing anchor pole, 2-preliminary bracing reinforced mesh, 3-initial stage sprayed mortar, 4-secondary supporting reinforced mesh, 5-the second stage of support anchor rod, 6-profile steel frame, 6.1-profile steel frame a, 6.2-profile steel frame b, 7-reinforcement backboard, 8-balancing band, 9-laterally bottom girder, 10-secondary injection concrete.
Detailed description of the invention
Embodiment is referring to shown in Fig. 1-2, a kind of mining tunnel new supporting structure, the multilayer supporting and protection structure being formed by preliminary bracing and secondary supporting, preliminary bracing comprises preliminary bracing anchor pole 1, preliminary bracing reinforced mesh 2 and initial stage sprayed mortar 3, wherein preliminary bracing reinforced mesh 2 covers country rock surface, preliminary bracing reinforced mesh 2 is connected and fixed by the preliminary bracing anchor pole 1 anchoring in country rock, both form one by initial stage sprayed mortar 3, and initial stage sprayed mortar 3 thickness can be 30mm-50mm.
The Main Function of preliminary bracing structure: preliminary bracing structure and broken country rock form an entirety, and the self-supporting ability that can make full use of country rock is resisted the pressure that country rock top is transmitted at short notice.
Secondary supporting comprises secondary supporting anchor pole 5, secondary supporting reinforced mesh 4, profile steel frame 6 and secondary injection concrete 10, preliminary bracing is close in the outside of secondary supporting reinforced mesh 4, inner side is close to along in the spaced profile steel frame 6 of country rock, and profile steel frame 6 is the symmetrical i iron of twin shaft or mono-symmetry i iron.
Ginseng as shown in Figure 3, two adjacent profile steel frame of front and back are between profile steel frame a6.1 and profile steel frame b6.2, to be also welded with to strengthen backboard 7, described reinforcement backboard 7 is angle steel, channel-section steel or steel pipe, between the adjacent profile steel frame 6 in every two front and back, arrange more than three, strengthen backboard by as a whole isolated each other profile steel frame connection, increased the globality of profile steel frame and the enabling capabilities to country rock.
In each profile steel frame 6, be all welded with some balancing bands 8, balancing band 8 intervals are symmetrically welded or interleaved is welded on the both sides of the edge of profile steel frame, the internal diameter of described balancing band 8 is greater than the external diameter of the second stage of support anchor rod 5, be positioned near the second stage of support anchor rod 5 of balancing band 8 and through balancing band 8, secondary supporting reinforced mesh 4 be anchored on country rock, all the other the second stage of support anchor rods 5 are also according to former design anchoring.Secondary supporting anchor pole 5, secondary supporting reinforced mesh 4, profile steel frame 6, reinforcement backboard 7 and balancing band 8 form one by secondary injection concrete 10, and the thickness of secondary injection concrete 10 is 100mm-200mm.
Described profile steel frame 6 is arch, if the rock mass of profile steel frame bottom is unstable, can between two profile steel frame bottoms, connect horizontal bottom girder 9, profile steel frame is connected to closed-loop structure to be become an organic whole and increases the profile steel frame bottom supporting capacity to country rock, and described horizontal bottom girder 9 be twin shaft symmetry i iron, mono-symmetry i iron or channel-section steel.
The construction method of this mining tunnel new supporting structure, step is as follows:
Step 1, excavation country rock, get rid of after the danger such as loosening sillar, performs preliminary bracing, first with preliminary bracing anchor pole 1, preliminary bracing reinforced mesh 2 is fixing along country rock surface;
Step 2, supporting reinforced mesh 2 exposed faces perform initial stage sprayed mortar 3 in the early stage, and preliminary bracing member and country rock are fixed into one;
Step 3, perform the second stage of supporting: first by secondary supporting reinforced mesh 4 supporting exposed face location in the early stage;
Step 4, by each profile steel frame 6 in secondary supporting reinforced mesh 4 exposed faces location;
Step 5, between two adjacent profile steel frame 6 of front and back welding at least three roads strengthen backboards 7;
Step 6, at the interval, both sides of the edge of profile steel frame 6 weld anchor bridle ring 8;
Step 7, mesh and preliminary bracing that secondary supporting anchor pole 5 orders are passed to balancing band 8, secondary supporting reinforced mesh 4, be anchored at secondary supporting reinforced mesh 4 on country rock;
Step 8, perform secondary injection concrete 10 all support units are connected into entirety.
After described step 4 or step 5, between two bottoms of described profile steel frame 6, connect horizontal bottom girder 9, profile steel frame is connected to closed-loop structure.
The present invention is not limited only to the present embodiment, and according to job site situation and technical requirements, its technical indicator and parameter all can make corresponding changes.
For example, in the preliminary bracing of embodiment, reinforced mesh mesh spacing can be made as 10cm × 10cm, and initial stage sprayed mortar 3 thickness are got 50mm, makes each member form one.
In the second stage of supporting of embodiment, profile steel frame 6 is i iron steelframe, strengthening backboard 7 is channel-section steel, can adopt the parallel reinforcement backboard 7 of polylith that former and later two adjacent profile steel frame 6 are welded according to actual conditions, welding position is the top flange downside of i iron steelframe, length direction interval along i iron arranges, balancing band 8 is welded on the both sides of the top flange of i iron steelframe, left and right interval welding successively, secondary injection concrete 10 thickness are got 200mm, all members are connected to become to an organic whole, and laterally bottom girder 9 is i iron.
Claims (9)
1. the construction method of a mining tunnel new supporting structure, it is characterized in that: described mining tunnel new supporting structure, the multilayer supporting and protection structure being formed by preliminary bracing and secondary supporting, wherein secondary supporting comprises secondary supporting anchor pole (5), secondary supporting reinforced mesh (4), profile steel frame (6) and secondary injection concrete (10), preliminary bracing is close in the outside of secondary supporting reinforced mesh (4), inner side is close to along in the spaced profile steel frame of country rock (6), it is characterized in that: between adjacent two profile steel frame (6) in front and back, be also welded with and strengthen backboard (7), in each profile steel frame (6), be all welded with some balancing bands (8), the internal diameter of described balancing band (8) is greater than the external diameter of the second stage of support anchor rod (5), second phase support anchor rod (5) is anchored at secondary supporting reinforced mesh (4) on country rock through balancing band (8), described secondary supporting anchor pole (5), secondary supporting reinforced mesh (4), profile steel frame (6), strengthen backboard (7) and balancing band (8) and form one by secondary injection concrete (10),
The construction method step of this supporting and protection structure is as follows:
Step 1, excavation country rock, get rid of after loosening sillar, performs preliminary bracing, first uses preliminary bracing anchor pole (1) that preliminary bracing reinforced mesh (2) is fixing along country rock surface;
Step 2, supporting reinforced mesh (2) exposed face performs initial stage sprayed mortar (3) in the early stage, and preliminary bracing member and country rock are fixed into one;
Step 3, perform the second stage of supporting: first by secondary supporting reinforced mesh (4) supporting exposed face location in the early stage;
Step 4, each profile steel frame (6) is located at secondary supporting reinforced mesh (4) exposed face;
Step 5, between adjacent two profile steel frame (6) in front and back welding at least three roads strengthen backboards (7);
Step 6, at the interval, both sides of the edge of profile steel frame (6) weld anchor bridle ring (8);
Step 7, mesh and preliminary bracing that secondary supporting anchor pole (5) order is passed to balancing band (8), secondary supporting reinforced mesh (4), be anchored at secondary supporting reinforced mesh (4) on country rock;
Step 8, perform secondary injection concrete (10) all support units are connected into entirety.
2. according to the construction method of the mining tunnel new supporting structure described in claim 1, it is characterized in that: described balancing band (8) interval is symmetrically welded or interleaved is welded on the both sides of the edge of profile steel frame.
3. according to the construction method of the mining tunnel new supporting structure described in claim 1, it is characterized in that: described preliminary bracing comprises preliminary bracing anchor pole (1), preliminary bracing reinforced mesh (2) and initial stage sprayed mortar (3), wherein preliminary bracing reinforced mesh (2) covers country rock surface, preliminary bracing reinforced mesh (2) is connected and fixed by the preliminary bracing anchor pole (1) anchoring in country rock, and both form one by initial stage sprayed mortar (3).
4. according to the construction method of the mining tunnel new supporting structure described in claim 1, it is characterized in that: described profile steel frame (6) is the symmetrical i iron of twin shaft or mono-symmetry i iron.
5. according to the construction method of the mining tunnel new supporting structure described in claim 1, it is characterized in that: described reinforcement backboard (7) is angle steel, channel-section steel or steel pipe, between the adjacent profile steel frame (6) in every two front and back, arrange more than three.
6. according to the construction method of the mining tunnel new supporting structure described in claim 1, it is characterized in that: the thickness of described secondary injection concrete (10) is 100mm-200mm.
7. according to the construction method of the mining tunnel new supporting structure described in claim 3, it is characterized in that: the thickness of described initial stage sprayed mortar (3) is 30mm-50mm.
8. according to the construction method of the mining tunnel new supporting structure described in claim 1, it is characterized in that: described profile steel frame (6) is arch, between its two bottom, connect horizontal bottom girder (9), profile steel frame is connected to closed-loop structure, and described horizontal bottom girder (9) is the symmetrical i iron of twin shaft, mono-symmetry i iron or channel-section steel.
9. according to the construction method of the mining tunnel new supporting structure described in claim 1, it is characterized in that: after described step 4 or step 5, between two bottoms of described profile steel frame (6), connect horizontal bottom girder (9), profile steel frame is connected to closed-loop structure.
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| CN201210569308.9A CN103061779B (en) | 2012-12-25 | 2012-12-25 | Novel mine tunnel supporting structure and construction method thereof |
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| CN201210569308.9A CN103061779B (en) | 2012-12-25 | 2012-12-25 | Novel mine tunnel supporting structure and construction method thereof |
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Families Citing this family (5)
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| CN104314583A (en) * | 2014-09-03 | 2015-01-28 | 山西煤炭运销集团晋城有限公司 | Support method of coal seam roadway empty area |
| CN108331594B (en) * | 2018-04-27 | 2023-06-30 | 中铁隧道局集团有限公司 | Supporting structure for weak surrounding rock tunnel |
| CN111236973B (en) * | 2020-01-13 | 2020-11-20 | 西南交通大学 | A toughness structure for plate movable belt tunnel |
| CN111997619B (en) * | 2020-07-16 | 2021-05-25 | 煤炭科学研究总院 | Mine shaft anti-seismic support method |
| CN112761676A (en) * | 2021-02-04 | 2021-05-07 | 岳阳市公路桥梁基建总公司 | UHPC tunnel lining structure and construction method thereof |
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| JP3985110B2 (en) * | 1998-01-13 | 2007-10-03 | 大成建設株式会社 | Shield tunnel reinforcement method |
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| CN201254996Y (en) * | 2008-07-24 | 2009-06-10 | 义马煤业(集团)有限责任公司 | Tunnel composite supporting construction |
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