CN104153800A - Complex geological small-clear-distance parallel tunnel cross anchor rod reinforcing system and construction method thereof - Google Patents
Complex geological small-clear-distance parallel tunnel cross anchor rod reinforcing system and construction method thereof Download PDFInfo
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- CN104153800A CN104153800A CN201410399172.0A CN201410399172A CN104153800A CN 104153800 A CN104153800 A CN 104153800A CN 201410399172 A CN201410399172 A CN 201410399172A CN 104153800 A CN104153800 A CN 104153800A
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Abstract
The invention relates to a complex geological small-clear-distance parallel tunnel cross anchor rod reinforcing system and a construction method of the reinforcing system. In the gradual closing process of two parallel tunnels of a bell mouth structure of a complex geological region, structural stability is low. In two lane tunnels of the small-clear-distance segments of the parallel tunnels of the bell mouth structure, a plurality of closed initial supporting steel frames are arranged, and concrete is sprayed for initial support. A plurality of cross anchor rods which are parallel in the vertical direction are fixed between the initial supporting steel frames of the two lane tunnels and penetrate through surrounding rock. The ends of the cross anchor rods are fixed to the initial supporting steel frames through steel plates and bolts. The cross anchor rods, the steel plates, the bolts and the initial supporting steel frames deform through the surrounding rock and are automatically locked to form a firm whole. For the special surrounding rock, the small-clear-distance segments of the two lane tunnels are provided with cross anchor rod stabilizing middle rock pillars and two sidewall structures, so that overall stress is achieved, and the effect is good; besides, the reinforcing system is scientific and reasonable in structure, easy and convenient to construct and high in practicability, thereby having extremely high application and popularization value.
Description
Technical field
the invention belongs to traffic engineering technical field, be specifically related to the little clear distance parallel tunnels of a kind of complicated geological to drawing bolt anchorage system and construction method thereof.
Background technology
In the past, horn mouth tunnel structure is generally avoided arranging in complicated geology location, mainly consider the stressed complexity of horn mouth tunnel structure in work progress, structure is not only a long-channel two-dimensional structure, due to influencing each other in the construction of left and right line, structure stress must be through multiple conversions, form the three-dimensional stress of one or more complexity, make conventional structure often be difficult to bear, if tunnel surrounding is hard complete, its good self-bearing capacity can be shared more country rock load, supporting and protection structure still can be stablized, or the softer but basic homogeneous of country rock and tool isotropism, affect without high-ground stress simultaneously, also can stablize stressed by adding strong supporting implementation structure.
But, in view of current China transport development emphasis tilts to western part, as everyone knows, western China topographic and geologic condition is extremely complicated special, the unfavorable geology such as active fault, high-ground stress phenomenon is very general, horn mouth tunnel structure cannot pass round Unfavorable Conditions completely, and bell-mouth structure of air is set in complicated geological tunnel becomes the reality that cannot avoid.
In complicated lamellar country rock or fault zone, be subject to high-ground stress effect simultaneously, the single parallel tunnels structure stress of horn mouth two is very complicated special, tunnel list is wide open in advance while digging, its stressed lithology that is mainly subject to, attitude of rocks, underground water, the comprehensive functions such as stress direction, and in the time that rear row tunnel excavation passes through, in advance tunnel originally the stress of rough balance due to neighbour tunnel cavern excavation adjust, be equivalent to another disturbance, and this disturbance is due to existence and the lithology in rear row tunnel, occurrence, water, the synergistic effect of the initial factors such as stress and become very complicated, simultaneously, the stress in row tunnel is because existence and the Secondary Disturbance in tunnel become same complexity in advance, finally balance gradually in dynamically adjusting, if project organization cannot be resisted this complicated adjustment process, must cause structural deterioration unstability, case history reflection is conventional or generally strengthen structure and be difficult to ensure Stability Analysis of Structures in this complicated geological small-clear-distance tunnel construction.
Summary of the invention
The object of this invention is to provide the little clear distance parallel tunnels of a kind of complicated geological to drawing bolt anchorage system and construction method thereof, solve the Stability Analysis of Structures problem of the little clear distance parallel tunnels of complicated geological.
The technical solution adopted in the present invention is:
The little clear distance parallel tunnels of complicated geological, to drawing bolt anchorage system, is characterized in that:
In two threaded list roads of the little clear distance section of horn mouth parallel tunnels, the preliminary bracing steelframe of multiple tracks sealing is set, and sprays preliminary bracing concrete;
Preliminary bracing steelframe is made up of the haunch portion preliminary bracing steelframe of arch preliminary bracing steelframe, both sides and the inverted arch portion preliminary bracing steelframe splicing of abutment wall portion preliminary bracing steelframe and bottom, seals into ring;
Between the preliminary bracing steelframe in two threaded list roads, be fixed with that to penetrate the multiple tracks of country rock upper and lower parallel to drawing anchor pole, to drawing anchor pole end to be fixed on preliminary bracing steelframe by steel plate and bolt.
To drawing anchor pole to be provided with upper and lower twice, be respectively drawing anchor pole and lower to drawing anchor pole;
Between the preliminary bracing steelframe bottom, arch that two threaded list roads close on, be connected with and penetrate the upper to drawing anchor pole of country rock;
Between the haunch portion preliminary bracing steelframe bottom that two threaded list roads close on, be connected with and penetrate the lower to drawing anchor pole of country rock.
The little clear distance parallel tunnels of complicated geological, to drawing the construction method of bolt anchorage system, is characterized in that:
Realized by following steps:
Step 1: topping bar of excavation I threaded list road, performs arch preliminary bracing steelframe pneumatically placed concrete in time;
Step 2: the bottom of topping bar in I threaded list road adopts down-the-hole drill to parallel tunnels sidetracking hole, in hole, penetrate the upper to drawing anchor pole of high-strength fining twisted steel system, pressure injection high grade mortar makes drawing the abundant anchoring of anchor pole and country rock, upper to drawing termination point of anchor rod to adopt steel plate and bolt and preliminary bracing steelframe bottom, arch to be fixed together;
Step 3: the middle step in excavation I threaded list road, perform in time haunch portion preliminary bracing steelframe pneumatically placed concrete, haunch portion preliminary bracing steelframe and preliminary bracing steelframe end, arch are fixed;
Step 4: adopt down-the-hole drill to parallel tunnels sidetracking hole in the middle step top in I threaded list road, in hole, penetrate the lower to drawing anchor pole of high-strength fining twisted steel system, pressure injection high grade mortar makes lower to drawing the abundant anchoring of anchor pole and country rock, lower to drawing termination point of anchor rod to adopt steel plate and bolt and haunch portion preliminary bracing steelframe bottom to be fixed together;
Step 5: continue excavation, perform abutment wall portion preliminary bracing steelframe and inverted arch portion preliminary bracing steelframe, with the affixed sealing of top steelframe, and pneumatically placed concrete;
Step 6: hysteresis certain distance, excavates topping bar of II threaded list road, and performs in time arch preliminary bracing steelframe the pneumatically placed concrete of II line;
Step 7: what performed while finding out construction I threaded list road is upper to drawing the termination of anchor pole in II threaded list road side, adopts the arch preliminary bracing steelframe in steel plate and bolt and II threaded list road to fix and lock;
Step 8: the middle step in excavation II threaded list road, perform in time haunch portion preliminary bracing steelframe pneumatically placed concrete, haunch portion preliminary bracing steelframe and preliminary bracing steelframe end, arch are fixed;
Step 9: what performed while finding out construction I threaded list road is lower to drawing the termination of anchor pole in II threaded list road side, adopts the haunch portion preliminary bracing steelframe in steel plate and bolt and II threaded list road to fix and lock;
Step 10: continue excavation, perform abutment wall portion preliminary bracing steelframe and inverted arch portion preliminary bracing steelframe, with the affixed sealing of top steelframe, and pneumatically placed concrete;
Alternately construction, completes little clear distance section parallel tunnels to drawing the construction of bolt anchorage system according to this.
The present invention has the following advantages:
The present invention adopts line-to-line to establish high strength to drawing anchor pole, to drawing anchor pole two ends and preliminary bracing steelframe to adopt bolt locking, rock pillar and both walls structure in the middle of stable, make the main force structure profile steel frame in threaded list road, left and right by drawing anchor pole to connect as a whole stress system, jointly bear the stress state that complicated geological and construction interference produce, ensure two threaded list roads construction and operation in supporting and protection structure stablize stressed, effect is better, scientific and reasonable for structure, easy construction is easily gone, practical, there is good application value.
Brief description of the drawings
Fig. 1 is the young clear distance parallel tunnels of loudspeaker plan view.
Fig. 2 is to drawing anchor pole front view.
Fig. 3 is that I threaded list road is to drawing anchor bolt construction figure.
Fig. 4 is that II threaded list road is to drawing anchor bolt construction figure.
Fig. 5 is to drawing anchor pole graphics.
In figure, 1-arch preliminary bracing steelframe, 2-haunch portion preliminary bracing steelframe, 3-abutment wall portion preliminary bracing steelframe, 4-inverted arch portion preliminary bracing steelframe, 5-tops bar, step in 6-, 7-is upper to drawing anchor pole, under 8-to drawing anchor pole, 9-steel plate and bolt.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention will be described in detail.
Referring to Fig. 1, bell-mouth structure of air two parallel tunnels are gradually in approach process, under different geological conditions, Stability Analysis of Structures sex expression difference is larger, when geology country rock is better, can accomplish zero spacing concurrent construction and not occur large problem, if but complicated geology, particularly in high ground stress soft rock stress location, line construction in left and right influences each other very large.
The little clear distance parallel tunnels of complicated geological the present invention relates to is to drawing bolt anchorage system, be applicable to the little clear distance section construction of above-mentioned horn mouth parallel tunnels, in two threaded list roads of the little clear distance section of horn mouth parallel tunnels, preliminary bracing steelframe the pneumatically placed concrete preliminary bracing of multiple tracks sealing are set, preliminary bracing steelframe is by arch preliminary bracing steelframe 1, the haunch portion preliminary bracing steelframe 2 of both sides and the inverted arch portion preliminary bracing steelframe of abutment wall portion preliminary bracing steelframe 3 and bottom 4 splicing compositions, preliminary bracing steelframe 1 in arch is topped bar and is performed for 5 o'clock in construction, haunch portion preliminary bracing steelframe 2 performs when step 6 in construction, abutment wall portion preliminary bracing steelframe 3, inverted arch portion preliminary bracing steelframe 4 all performs in the time of construction corresponding site.Between the preliminary bracing steelframe in two threaded list roads, be fixed with that to penetrate the multiple tracks of country rock upper and lower parallel to drawing anchor pole, to drawing anchor pole end to be fixed on preliminary bracing steelframe by steel plate and bolt 9.Be a firmly entirety to drawing anchor pole, steel plate and bolt 9 and preliminary bracing steelframe can utilize surrouding rock deformation automatic locking, but for controlling Support Deformation, also can apply certain prestressing force to anchor pole.
According to the needs of Stability Analysis of Structures and resistance to deformation, to drawing the quantity that anchor pole be arranged in parallel up and down can be according to Operating condition adjustment, can adopt twice, three roads, four roads, even more.As shown in Figure 2, to drawing anchor pole that upper and lower twice are set, be respectively drawing anchor pole 7 and lower to drawing anchor pole 8, between arch preliminary bracing steelframe 1 bottom that two threaded list roads close on, be connected with and penetrate the upper of country rock and penetrate the lower to drawing anchor pole 8 of country rock to being connected with between haunch portion preliminary bracing steelframe 2 bottoms of drawing anchor pole 7, two threaded list roads to close on.
The little clear distance parallel tunnels of above-mentioned complicated geological, to drawing the construction method of bolt anchorage system, is realized by following steps:
Step 1: excavation I threaded list road top bar 5, perform arch preliminary bracing steelframe 1 pneumatically placed concrete on 5 in topping bar;
Step 2: 5 bottoms of topping bar in I threaded list road adopt down-the-hole drill to parallel tunnels sidetracking hole, in hole, penetrate the upper to drawing anchor pole 7 of high-strength fining twisted steel system, pressure injection high grade mortar makes drawing anchor pole 7 and the abundant anchoring of country rock, upper to drawing anchor pole 7 terminations to adopt steel plate and bolt 9 and arch preliminary bracing steelframe 1 bottom to be fixed together;
Step 3: the middle step 6 in excavation I threaded list road, perform haunch portion preliminary bracing steelframe 2 pneumatically placed concrete in middle step 6, haunch portion preliminary bracing steelframe 2 is fixed with arch preliminary bracing steelframe 1 end;
Step 4: middle step 6 bottoms in I threaded list road adopt down-the-hole drill to parallel tunnels sidetracking hole, in hole, penetrate the lower to drawing anchor pole 8 of high-strength fining twisted steel system, pressure injection high grade mortar makes lower to drawing anchor pole 8 and the abundant anchoring of country rock, lower to drawing anchor pole 8 terminations to adopt steel plate and bolt 9 and haunch portion preliminary bracing steelframe 2 bottoms to be fixed together;
Step 5: continue excavation, perform abutment wall portion preliminary bracing steelframe 3 and inverted arch portion preliminary bracing steelframe 4, with the affixed sealing of top steelframe, and pneumatically placed concrete;
Step 6: hysteresis certain distance, excavation II threaded list road top bar 5, perform arch preliminary bracing steelframe 1 pneumatically placed concrete on 5 in topping bar;
Step 7: find out upper to drawing the termination of anchor pole 7 in II threaded list road side that I threaded list road has performed, adopt the arch preliminary bracing steelframe 1 in steel plate and bolt 9 and II threaded list road to fix and lock;
Step 8: the middle step 6 in excavation II threaded list road, perform haunch portion preliminary bracing steelframe 2 pneumatically placed concrete in middle step, haunch portion preliminary bracing steelframe 2 is fixed with arch preliminary bracing steelframe 1 end;
Step 9: find out lower to drawing the termination of anchor pole 8 in II threaded list road side that I threaded list road has performed, adopt the haunch portion preliminary bracing steelframe 2 in steel plate and bolt 9 and II threaded list road to fix and lock;
Step 10: continue excavation, perform abutment wall portion preliminary bracing steelframe 3 and inverted arch portion preliminary bracing steelframe 4, with the affixed sealing of top steelframe, and pneumatically placed concrete;
Alternately construction, completes little clear distance section parallel tunnels to drawing the construction of bolt anchorage system according to this.
It is cited that content of the present invention is not limited to embodiment, and the conversion of any equivalence that those of ordinary skill in the art take technical solution of the present invention by reading manual of the present invention, is claim of the present invention and contains.
Claims (3)
1. the little clear distance parallel tunnels of complicated geological, to drawing bolt anchorage system, is characterized in that:
In two threaded list roads of the little clear distance section of horn mouth parallel tunnels, the preliminary bracing steelframe of multiple tracks sealing is set, and sprays preliminary bracing concrete;
Preliminary bracing steelframe is made up of the haunch portion preliminary bracing steelframe (2) of arch preliminary bracing steelframe (1), both sides and the splicing of the inverted arch portion preliminary bracing steelframe (4) of abutment wall portion preliminary bracing steelframe (3) and bottom, seals into ring;
Between the preliminary bracing steelframe in two threaded list roads, be fixed with that to penetrate the multiple tracks of country rock upper and lower parallel to drawing anchor pole, to drawing anchor pole end to be fixed on preliminary bracing steelframe by steel plate and bolt (9).
2. the little clear distance parallel tunnels of complicated geological according to claim 1, to drawing bolt anchorage system, is characterized in that:
To drawing anchor pole to be provided with upper and lower twice, be respectively drawing anchor pole (7) and lower to drawing anchor pole (8);
Between arch preliminary bracing steelframe (1) bottom that two threaded list roads close on, be connected with and penetrate the upper to drawing anchor pole (7) of country rock;
Between haunch portion preliminary bracing steelframe (2) bottom that two threaded list roads close on, be connected with and penetrate the lower to drawing anchor pole (8) of country rock.
3. the little clear distance parallel tunnels of complicated geological, to drawing the construction method of bolt anchorage system, is characterized in that:
Realized by following steps:
Step 1: top bar (5) in excavation I threaded list road, perform arch preliminary bracing steelframe (1) pneumatically placed concrete in time;
Step 2: (5) bottom of topping bar in I threaded list road adopts down-the-hole drill to parallel tunnels sidetracking hole, in hole, penetrate the upper to drawing anchor pole (7) of high-strength fining twisted steel system, pressure injection high grade mortar makes drawing anchor pole (7) and the abundant anchoring of country rock, upper to drawing anchor pole (7) termination to adopt steel plate and bolt (9) and arch preliminary bracing steelframe (1) bottom to be fixed together;
Step 3: the middle step (6) in excavation I threaded list road, perform in time haunch portion preliminary bracing steelframe (2) pneumatically placed concrete, haunch portion preliminary bracing steelframe (2) is fixed with arch preliminary bracing steelframe (1) end;
Step 4: adopt down-the-hole drill to parallel tunnels sidetracking hole in middle step (6) top in I threaded list road, in hole, penetrate the lower to drawing anchor pole (8) of high-strength fining twisted steel system, pressure injection high grade mortar makes lower to drawing anchor pole (8) and the abundant anchoring of country rock, lower to drawing anchor pole (8) termination to adopt steel plate and bolt (9) and haunch portion preliminary bracing steelframe (2) bottom to be fixed together;
Step 5: continue excavation, perform abutment wall portion preliminary bracing steelframe (3) and inverted arch portion preliminary bracing steelframe (4), with the affixed sealing of top steelframe, and pneumatically placed concrete;
Step 6: hysteresis certain distance, excavates top bar (5) in II threaded list road, and performs in time arch preliminary bracing steelframe (1) the pneumatically placed concrete of II line;
Step 7: what performed while finding out construction I threaded list road is upper to drawing the termination of anchor pole (7) in II threaded list road side, adopts the arch preliminary bracing steelframe (1) in steel plate and bolt (9) and II threaded list road to fix and lock;
Step 8: the middle step (6) in excavation II threaded list road, perform in time haunch portion preliminary bracing steelframe (2) pneumatically placed concrete, haunch portion preliminary bracing steelframe (2) is fixed with arch preliminary bracing steelframe (1) end;
Step 9: what performed while finding out construction I threaded list road is lower to drawing the termination of anchor pole (8) in II threaded list road side, adopts the haunch portion preliminary bracing steelframe (2) in steel plate and bolt (9) and II threaded list road to fix and lock;
Step 10: continue excavation, perform abutment wall portion preliminary bracing steelframe (3) and inverted arch portion preliminary bracing steelframe (4), with the affixed sealing of top steelframe, and pneumatically placed concrete;
Alternately construction, completes little clear distance section parallel tunnels to drawing the construction of bolt anchorage system according to this.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410399172.0A CN104153800B (en) | 2014-08-14 | 2014-08-14 | Complicated geological small interval parallel tunnels Counter-pulled bolts reinforcement system and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410399172.0A CN104153800B (en) | 2014-08-14 | 2014-08-14 | Complicated geological small interval parallel tunnels Counter-pulled bolts reinforcement system and construction method thereof |
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| CN104153800A true CN104153800A (en) | 2014-11-19 |
| CN104153800B CN104153800B (en) | 2016-04-27 |
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Cited By (9)
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| CN104847365A (en) * | 2015-05-20 | 2015-08-19 | 深圳市市政设计研究院有限公司 | Construction method for small-clear-distance four-lane shallow-buried large-span tunnel |
| CN109356592A (en) * | 2018-09-30 | 2019-02-19 | 中国建筑第八工程局有限公司 | The construction method in small interval lamination tunnel |
| CN110318771A (en) * | 2019-07-30 | 2019-10-11 | 湖南科技大学 | Shared Rock of Neighborhood Tunnel bracing means and Counter-pulled bolts brace pre axial force determine method |
| CN111485914A (en) * | 2020-04-13 | 2020-08-04 | 中铁二院工程集团有限责任公司 | Rock pillar construction method in replacement of high-ground-stress soft rock large-deformation ultra-small clear distance tunnel |
| CN111764923A (en) * | 2020-06-29 | 2020-10-13 | 中铁隆工程集团有限公司 | Construction method for dismantling temporary inverted arch of existing tunnel with cross-cut downward |
| CN112727512A (en) * | 2020-12-31 | 2021-04-30 | 同济大学 | Advanced detection, shock insulation and advanced transverse counter-pulling anchor rod system of ultra-small clear distance tunnel |
| 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 |
| CN113047865A (en) * | 2021-03-31 | 2021-06-29 | 中建二局第三建筑工程有限公司 | Clamping and reinforcing bent frame for middle rock pillar of large-section small-clear-distance tunnel and construction method of clamping and reinforcing bent frame |
| CN113074003A (en) * | 2021-04-30 | 2021-07-06 | 中铁二十局集团第六工程有限公司 | Method for inhibiting deformation of small-clear-distance tunnel in argillaceous sandstone stratum |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104847365A (en) * | 2015-05-20 | 2015-08-19 | 深圳市市政设计研究院有限公司 | Construction method for small-clear-distance four-lane shallow-buried large-span tunnel |
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| CN109356592B (en) * | 2018-09-30 | 2020-03-20 | 中国建筑第八工程局有限公司 | Construction method of small-clear-distance laminated tunnel |
| CN110318771A (en) * | 2019-07-30 | 2019-10-11 | 湖南科技大学 | Shared Rock of Neighborhood Tunnel bracing means and Counter-pulled bolts brace pre axial force determine method |
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| CN111485914B (en) * | 2020-04-13 | 2021-07-13 | 中铁二院工程集团有限责任公司 | Rock pillar construction method in replacement of high-ground-stress soft rock large-deformation ultra-small clear distance tunnel |
| CN111485914A (en) * | 2020-04-13 | 2020-08-04 | 中铁二院工程集团有限责任公司 | Rock pillar construction method in replacement of high-ground-stress soft rock large-deformation ultra-small clear distance tunnel |
| CN111764923A (en) * | 2020-06-29 | 2020-10-13 | 中铁隆工程集团有限公司 | Construction method for dismantling temporary inverted arch of existing tunnel with cross-cut downward |
| CN112727512A (en) * | 2020-12-31 | 2021-04-30 | 同济大学 | Advanced detection, shock insulation and advanced transverse counter-pulling anchor rod system of ultra-small clear distance tunnel |
| 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 |
| CN113047865A (en) * | 2021-03-31 | 2021-06-29 | 中建二局第三建筑工程有限公司 | Clamping and reinforcing bent frame for middle rock pillar of large-section small-clear-distance tunnel and construction method of clamping and reinforcing bent frame |
| CN113074003A (en) * | 2021-04-30 | 2021-07-06 | 中铁二十局集团第六工程有限公司 | Method for inhibiting deformation of small-clear-distance tunnel in argillaceous sandstone stratum |
| CN113074003B (en) * | 2021-04-30 | 2023-08-25 | 中铁二十局集团第六工程有限公司 | Small clear distance tunnel deformation inhibition method for argillaceous sandstone stratum |
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