CN105822311A - In-situ extension construction structure and method for extra-large-section tunnel with opening formed inside to enlarge working face - Google Patents
In-situ extension construction structure and method for extra-large-section tunnel with opening formed inside to enlarge working face Download PDFInfo
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- CN105822311A CN105822311A CN201610326430.1A CN201610326430A CN105822311A CN 105822311 A CN105822311 A CN 105822311A CN 201610326430 A CN201610326430 A CN 201610326430A CN 105822311 A CN105822311 A CN 105822311A
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- 238000010276 construction Methods 0.000 title claims abstract description 39
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 103
- 239000010959 steel Substances 0.000 claims abstract description 103
- 239000011435 rock Substances 0.000 claims abstract description 34
- 239000002893 slag Substances 0.000 claims description 16
- 238000004873 anchoring Methods 0.000 claims description 15
- 230000008093 supporting effect Effects 0.000 claims description 9
- 239000011230 binding agent Substances 0.000 claims description 7
- 238000009412 basement excavation Methods 0.000 claims description 6
- 239000011083 cement mortar Substances 0.000 claims description 6
- 239000004567 concrete Substances 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 230000011218 segmentation Effects 0.000 claims description 6
- 239000011378 shotcrete Substances 0.000 claims description 6
- 238000005422 blasting Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000005553 drilling Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000004880 explosion Methods 0.000 claims description 3
- 239000002689 soil Substances 0.000 claims description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention relates to an in-situ extension construction structure and method for an extra-large-section tunnel with an opening formed inside to enlarge a working face. The in-situ extension construction structure is characterized by comprising an existing tunnel, a first temporary steel cover arch and a second temporary steel cover arch, wherein the first temporary steel cover arch and the second temporary steel cover arch are arranged in the existing tunnel in a spaced mode in the length direction of the tunnel, an extra-large-section tunnel outline is formed after surrounding rock is excavated out of the part, between the first temporary steel cover arch and the second temporary steel cover arch, of the existing tunnel, a primary support is arranged on the surface of the extra-large-section tunnel outline, and radial system anchor bolts are arranged in the radial direction of the extra-large-section tunnel outline. According to the in-situ extension construction structure and method, the opening is formed inside the existing tunnel to enlarge the working face in a city dense environment where it is not allowed to excavate a vertical shaft (inclined shaft) to enlarge a working face, the construction progress can be significantly accelerated, and the construction period can be significantly shortened.
Description
Technical field:
The present invention relates to constructing structure and the construction method of mountain tunnel, specifically, be a kind of Super-large-section tunnel enlarging constructing structure and the construction method in situ increasing the scope of operation at existing tunnel inside opening.
Background technology:
Along with developing rapidly of national economy, the volume of traffic increases day by day, and many builds municipal traffic tunnel of the remote past can not meet Road Transportation demand, must extend, can be only achieved corresponding service level on existing tunnel former address.Enlarging scheme in situ generally includes following two: list hole tunnel is extended into multiple-arch tunnel, or list hole tunnel is extended into Super-large-section tunnel.Relatively for multiple-arch tunnel, although it is bigger that Super-large-section tunnel is faced with span, the unfavorable factors such as support structure design is complicated, working procedure conversion is frequent, but there is the advantages such as road show line is convenient, level of service is high, social benefit is good, be therefore increasingly widely applied in the original position extension project in municipal traffic tunnel.
On the other hand, it is relatively big that the guarantor of town road leads to pressure, therefore higher to the construction period of municipal traffic tunnel extension project in situ.In conventional mountain tunnel, by earth's surface excavating shaft (or inclined shaft) to increase the scope of operation, it it is the most effectual way improving construction speed；And in the intensive urban environment of construction of structures, the most do not possess the site condition from earth's surface excavating shaft (or inclined shaft).It can be considered to from the mode of existing tunnel inside opening, reach to increase the scope of operation, improve the purpose of construction speed.
Summary of the invention:
It is an object of the invention to solve municipal traffic tunnel extension project in situ protects the logical difficult problem that pressure is big, construction period is high, it is provided that a kind of Super-large-section tunnel enlarging constructing structure and construction method in situ increasing the scope of operation from existing tunnel inside opening.
Inside opening of the present invention increases the Super-large-section tunnel enlarging constructing structure in situ of the scope of operation, it is characterized in that: include existing tunnel and in existing tunnel, be provided with the spaced first interim steel bushing arch and the second interim steel bushing arch along length of tunnel direction, Super-large-section tunnel profile is formed after excavating country rock on existing tunnel between described first interim steel bushing arch and the second interim steel bushing arch, being provided with preliminary bracing at Super-large-section tunnel contour surface, the radial direction of described Super-large-section tunnel profile is laid with radial system anchor pole.
Further, above-mentioned radial system anchor pole is lengthl=3m, diameterϕThe anchor rod with cement mortar of=22mm, with spacingd=0.5m quincuncial arrangement forms.
Further, above-mentioned preliminary bracing includes 5 Pin I22 steel arch-shelf and covers the 25cm thickness gunite concrete on its surface.
Further, the following side of above-mentioned Super-large-section tunnel profile is provided with lock foot anchoring stock, and lock foot anchoring stock includes 2 root length degreel=6m, diameterϕThe hollow grouting anchor of=32mm.
Further, the above-mentioned first interim steel bushing arch and the second interim steel bushing arch are welded by 4 road U16 channel-section steel binders by 10 Pin I22 steel arch-shelf.
Further, the above-mentioned first interim steel bushing arch and the second interim steel bushing arch spacing 4m, the first interim steel bushing arch and the second interim steel bushing encircle a length of 10m.
Super-large-section tunnel drilling and blasting method of the present invention enlarging construction method in situ, it is characterised in that: construction method includes three steps, is 1 successively) wall rock grouting is reinforced and inner sleeve arch in hole is reinforced；2) Super-large-section tunnel upper right quarter digs and preliminary bracing；3) Super-large-section tunnel upper left quarter digs and preliminary bracing.
Wherein 1) wall rock grouting is reinforced and is reinforced with hole inner sleeve arch:
Along existing tunnel longitudinally along choose a bit of interval (siding-to-siding block length B=4m) as inside opening section, before and after it, the interval (siding-to-siding block length B1=10m) in certain mileage is as extension section；First the country rock in open section and extension segment limit is carried out grouting behind shaft or drift lining reinforcing, the stabilized soil pavement of the wall rock grouting reinforcing body formed, the standard of the above rock mass of IV level should be equivalent to；
Apply interim steel bushing arch inside the existing tunnel lining cutting of the section of extension front and back, interim steel bushing arch is welded by 4 road U16 channel-section steel binders by 10 Pin I22 steel arch-shelf, is reliably connected with existing tunnel liner structure by bolt at the arch springing of every Pin steel arch-shelf；
2) Super-large-section tunnel upper right quarter digs and preliminary bracing:
Start the most upwards from right side abutment wall, existing tunnel liner structure is abolished in segmentation, dig country rock to setting contour line simultaneously, apply preliminary bracing, lock foot anchoring stock and radial system anchor pole in time, wherein preliminary bracing includes 5 Pin I22 steel arch-shelf and covers the 25cm thickness gunite concrete of its upper surface, and lock foot anchoring stock includes 2 root length degreel=6m, diameterϕThe hollow grouting anchor of=32mm, radial system anchor pole is by lengthl=3m, diameterϕThe anchor rod with cement mortar of=22mm, by spacingd=0.5m quincuncial arrangement forms；
When digging to existing tunnel vault, use vault temporary steel support, the pressure from surrounding rock that Tunnel is undertaken will be digged, temporary steel support obliquely passes to steel bushing arch to both sides, when digging to existing tunnel leftwall, use abutment wall temporary steel support, the pressure from surrounding rock that Tunnel is undertaken will be digged, steel bushing arch is obliquely passed to both sides, by temporary steel support and the supporting role of temporary steel support, improve the vertical bearing capacity of preliminary bracing, it is ensured that dig the stability in the large of rear tunnel surrounding；
3) Super-large-section tunnel upper left quarter digs and preliminary bracing:
Start downward successively from left side haunch, segmentation digs country rock to setting contour line, applies preliminary bracing, radial system anchor pole and lock foot anchoring stock in time, and its supporting parameter is identical with right side；The hole slag that excavation is formed laterally is discharged, and heap fills in existing tunnel, forms hole slag backfill, is conducive to digging the stability in the large of rear tunnel surrounding.
After above-mentioned excavation and support, apply 2 Pin I22 steelframe vertical supportings, its upper end is reliably welded with preliminary bracing, lower end is directly supported on the liner structure of existing tunnel, it is remarkably improved the vertical bearing capacity of preliminary bracing, after completing the conversion of vertical power transmission, dismountable temporary steel support and, remove interim steel bushing arch.
Construction method of the present invention also includes the 4th step, follow-up dig and slag tap:
After forming the working space of B=4m width, add 2 faces, just can be similar with ordinary crossing driving, tunnel from centre to both sides, but it is different by vertical shaft mode of slagging tap from ordinary crossing, explosion on newly-increased face is slagged tap, laterally must discharge through the inside opening section of B=4m, owing to slag discharge efficiency is relatively low, upper right quarter and the upper left quarter of Super-large-section tunnel is only digged in the newly-increased scope of operation, its hole slag backfills in existing tunnel, both can save haul distance, is conducive to again digging the stability in the large of rear tunnel surrounding.
The present invention is not possessing from the urban compact environment of earth's surface excavating shaft (or inclined shaft) the increase scope of operation, by increasing the scope of operation from existing tunnel inside opening, can significantly improve construction speed, shorten the construction period.
Accompanying drawing illustrates:
Fig. 1 is the enlarging construction procedure one (transverse section) that inside opening increases the scope of operation；
Fig. 2 is the enlarging construction procedure one (vertical section) that inside opening increases the scope of operation；
Fig. 3 is the enlarging construction procedure two (transverse section) that inside opening increases the scope of operation；
Fig. 4 is the enlarging construction procedure two (vertical section) that inside opening increases the scope of operation；
Fig. 5 is the enlarging construction procedure three (transverse section) that inside opening increases the scope of operation；
Fig. 6 is the enlarging construction procedure three (vertical section) that inside opening increases the scope of operation.
Detailed description of the invention:
Below in conjunction with accompanying drawing, feature of present invention and application flow are further described, in order to understand.
Inside opening of the present invention increases Super-large-section tunnel enlarging constructing structure (as shown in Figure 3,4) in situ of the scope of operation, including existing tunnel A be provided with the spaced first interim steel bushing arch 31a and second interim steel bushing arch 31b in existing tunnel along length of tunnel direction, Super-large-section tunnel profile B is formed after excavating country rock on existing tunnel between described first interim steel bushing arch and the second interim steel bushing arch, being provided with preliminary bracing 41 at Super-large-section tunnel contour surface, the radial direction of described Super-large-section tunnel profile is laid with radial system anchor pole 43.
Further, above-mentioned radial system anchor pole 43 is lengthl=3m, diameterϕThe anchor rod with cement mortar of=22mm, with spacingd=0.5m quincuncial arrangement forms.
Further, above-mentioned preliminary bracing 41 includes 5 Pin I22 steel arch-shelf and covers the 25cm thickness gunite concrete on its surface.Preliminary bracing 41 includes that 5 Pin I22 steel arch-shelf are and have 5 I22 steel arch-shelf, and I22 steel arch-shelf is national standard part.
Further, the following side of above-mentioned Super-large-section tunnel profile B is provided with lock foot anchoring stock 42, and lock foot anchoring stock 42 includes 2 root length degreel=6m, diameterϕThe hollow grouting anchor of=32mm.
Further, the above-mentioned first interim steel bushing arch and the second interim steel bushing arch are welded by 4 road U16 channel-section steel binders by 10 Pin I22 steel arch-shelf.First and second interim steel bushing encircles by 10 Pin I22 steel arch-shelf, is and has 10 I22 steel arch-shelf, and I22 steel arch-shelf is national standard part, and U16 channel-section steel binder is the steel channel beam that model is U16.
Further, the above-mentioned first interim steel bushing arch and the second interim steel bushing arch spacing 4m, the first interim steel bushing arch and the second interim steel bushing encircle a length of 10m.
Super-large-section tunnel drilling and blasting method of the present invention enlarging construction method in situ, construction method includes three steps, is 1 successively) wall rock grouting is reinforced and inner sleeve arch in hole is reinforced；2) Super-large-section tunnel upper right quarter digs and preliminary bracing；3) Super-large-section tunnel upper left quarter digs and preliminary bracing.
Wherein 1) wall rock grouting is reinforced and is reinforced (as shown in Figure 1, 2) with hole inner sleeve arch:
Along existing tunnel longitudinally along choose a bit of interval (siding-to-siding block length B=4m) as inside opening section, before and after it, the interval (siding-to-siding block length B1=10m) in certain mileage is as extension section；First the country rock in open section and extension segment limit is carried out grouting behind shaft or drift lining reinforcing, the stabilized soil pavement of the wall rock grouting reinforcing body 32 formed, the standard of the above rock mass of IV level should be equivalent to；Rock mass more than IV level be grade be the rock mass of IV level, it is national standard, and its RQD/% is 75-90.
Apply interim steel bushing arch 31(front and back inside the existing tunnel lining cutting of the section of extension and include the first interim steel bushing arch 31a and second interim steel bushing arch 31b), interim steel bushing arch 31 is welded by 4 road U16 channel-section steel binders by 10 Pin I22 steel arch-shelf, is reliably connected with existing tunnel liner structure by bolt at the arch springing of every Pin steel arch-shelf.
2) Super-large-section tunnel upper right quarter digs and preliminary bracing (as shown in Figure 3,4):
Start the most upwards from right side abutment wall, existing tunnel liner structure is abolished in segmentation, dig country rock to setting contour line simultaneously, apply preliminary bracing 41, lock foot anchoring stock 42 and radial system anchor pole 43 in time, wherein preliminary bracing 41 includes 5 Pin I22 steel arch-shelf and covers the 25cm thickness gunite concrete of its upper surface, and lock foot anchoring stock 42 includes 2 root length degreel=6m, diameterϕThe hollow grouting anchor of=32mm, radial system anchor pole 43 is by lengthl=3m, diameterϕThe anchor rod with cement mortar of=22mm, by spacingd=0.5m quincuncial arrangement forms.
When digging to existing tunnel vault, use vault temporary steel support 33, the pressure from surrounding rock that Tunnel 41 is undertaken will be digged, temporary steel support 33 obliquely passes to steel bushing arch 31 to both sides, when digging to existing tunnel leftwall, use abutment wall temporary steel support 34, the pressure from surrounding rock that Tunnel 41 is undertaken will be digged, steel bushing arch 31 is obliquely passed to both sides, by temporary steel support 33 and the supporting role of temporary steel support 34, improve the vertical bearing capacity of preliminary bracing 41, it is ensured that dig the stability in the large of rear tunnel surrounding.
3) Super-large-section tunnel upper left quarter digs and preliminary bracing (as shown in Figure 5,6):
Start downward successively from left side haunch, segmentation digs country rock to setting contour line, applies preliminary bracing 4101, radial system anchor pole 4301 and lock foot anchoring stock 4201 in time, and its supporting parameter is identical with right side；The hole slag that excavation is formed laterally is discharged, and heap fills in existing tunnel, forms hole slag backfill 23, is conducive to digging the stability in the large of rear tunnel surrounding.
After above-mentioned excavation and support, apply 2 Pin I22 steelframe vertical supportings 44, its upper end is reliably welded with preliminary bracing 41, lower end is directly supported on the liner structure of existing tunnel, it is remarkably improved the vertical bearing capacity of preliminary bracing 41, after completing the conversion of vertical power transmission, dismountable temporary steel support 33 and 34, remove interim steel bushing arch 31.
Construction method of the present invention also includes the 4th step, follow-up dig and slag tap:
After forming the working space of B=4m width, add 2 faces, just can be similar with ordinary crossing driving, tunnel from centre to both sides, but it is different by vertical shaft mode of slagging tap from ordinary crossing, explosion on newly-increased face is slagged tap, laterally must discharge through the inside opening section of B=4m, owing to slag discharge efficiency is relatively low, upper right quarter and the upper left quarter of Super-large-section tunnel is only digged in the newly-increased scope of operation, its hole slag backfills in existing tunnel, both can save haul distance, is conducive to again digging the stability in the large of rear tunnel surrounding.
Inside opening of the present invention increases Super-large-section tunnel enlarging constructing structure and the method in situ of the scope of operation, has following 3 obvious advantages.
1) do not possessing from the urban compact environment of earth's surface excavating shaft (or inclined shaft) the increase scope of operation, Super-large-section tunnel of the present invention enlarging construction method in situ, by increasing the scope of operation from existing tunnel inside opening, construction speed can be significantly improved, shorten the construction period.
2) original position of the present invention enlarging construction method, the pressure from surrounding rock that Tunnel is undertaken will be digged by temporary steel support, obliquely pass to interim steel bushing arch to both sides, the vertical bearing capacity of preliminary bracing can be significantly improved, it is ensured that dig the stability in the large of rear tunnel surrounding.
3) original position of the present invention enlarging construction method, after the working space forming one fixed width, so that it may similar with ordinary crossing driving, tunnel from centre to both sides, its hole slag backfills in existing tunnel simultaneously, both can save haul distance, is conducive to again digging the stability in the large of rear tunnel surrounding.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every equivalent structure utilizing description of the invention and accompanying drawing content to be made or equivalence flow process conversion; or directly or indirectly it is used in other relevant technical fields, the most in like manner it is included in the scope of patent protection of the present invention.
Claims (9)
1. the Super-large-section tunnel enlarging constructing structure in situ of an inside opening increase scope of operation, it is characterized in that: include existing tunnel (A) and in existing tunnel, be provided with the spaced first interim steel bushing arch (31a) and the second interim steel bushing arch (31b) along length of tunnel direction, Super-large-section tunnel profile (B) is formed after excavating country rock on existing tunnel between described first interim steel bushing arch and the second interim steel bushing arch, it is provided with preliminary bracing (41) at Super-large-section tunnel contour surface, the radial direction of described Super-large-section tunnel profile is laid with radial system anchor pole (43).
Inside opening the most according to claim 1 increases the Super-large-section tunnel enlarging constructing structure in situ of the scope of operation, it is characterised in that: described radial system anchor pole (43) is lengthl=3m, diameterϕThe anchor rod with cement mortar of=22mm, with spacingd=0.5m quincuncial arrangement forms.
Inside opening the most according to claim 1 increases the Super-large-section tunnel enlarging constructing structure in situ of the scope of operation, it is characterised in that: described preliminary bracing (41) includes 5 Pin I22 steel arch-shelf and covers the 25cm thickness gunite concrete on its surface.
Inside opening the most according to claim 1 increases the Super-large-section tunnel enlarging constructing structure in situ of the scope of operation, it is characterized in that: the following side of described Super-large-section tunnel profile (B) is provided with lock foot anchoring stock (42), and lock foot anchoring stock 42 includes 2 root length degreel=6m, diameterϕThe hollow grouting anchor of=32mm.
Inside opening the most according to claim 1 increases the Super-large-section tunnel enlarging constructing structure in situ of the scope of operation, it is characterised in that: the described first interim steel bushing arch and the second interim steel bushing arch are welded by 4 road U16 channel-section steel binders by 10 Pin I22 steel arch-shelf.
Inside opening the most according to claim 1 increases the Super-large-section tunnel enlarging constructing structure in situ of the scope of operation, it is characterized in that: the described first interim steel bushing arch and the second interim steel bushing arch spacing 4m, the first interim steel bushing arch and the second interim steel bushing encircle a length of 10m.
7. a Super-large-section tunnel drilling and blasting method enlarging construction method in situ, it is characterised in that: construction method includes three steps, is 1 successively) wall rock grouting is reinforced and inner sleeve arch in hole is reinforced；2) Super-large-section tunnel upper right quarter digs and preliminary bracing；3) Super-large-section tunnel upper left quarter digs and preliminary bracing.
Super-large-section tunnel drilling and blasting method the most according to claim 7 enlarging construction method in situ, it is characterised in that:
1) wall rock grouting is reinforced and is reinforced with hole inner sleeve arch:
Along existing tunnel longitudinally along choose a bit of interval (siding-to-siding block length B=4m) as inside opening section, before and after it, the interval (siding-to-siding block length B1=10m) in certain mileage is as extension section；First the country rock in open section and extension segment limit is carried out grouting behind shaft or drift lining reinforcing, the stabilized soil pavement of the wall rock grouting reinforcing body (32) formed, the standard of the above rock mass of IV level should be equivalent to；
Interim steel bushing arch (31) is applied inside the existing tunnel lining cutting of the section of extension front and back, interim steel bushing arch (31) is welded by 4 road U16 channel-section steel binders by 10 Pin I22 steel arch-shelf, is reliably connected with existing tunnel liner structure by bolt at the arch springing of every Pin steel arch-shelf；
2) Super-large-section tunnel upper right quarter digs and preliminary bracing:
Start the most upwards from right side abutment wall, existing tunnel liner structure is abolished in segmentation, dig country rock to setting contour line simultaneously, apply preliminary bracing (41), lock foot anchoring stock (4) and radial system anchor pole (43) in time, wherein preliminary bracing (41) includes 5 Pin I22 steel arch-shelf and covers the 25cm thickness gunite concrete of its upper surface, and lock foot anchoring stock (42) includes 2 root length degreel=6m, diameterϕThe hollow grouting anchor of=32mm, radial system anchor pole (43) is by lengthl=3m, diameterϕThe anchor rod with cement mortar of=22mm, by spacingd=0.5m quincuncial arrangement forms；
When digging to existing tunnel vault, use vault temporary steel support (33), the pressure from surrounding rock that Tunnel (41) is undertaken will be digged, temporary steel support (33) obliquely passes to steel bushing arch (31) to both sides, when digging to existing tunnel leftwall, use abutment wall temporary steel support (34), the pressure from surrounding rock that Tunnel (41) is undertaken will be digged, steel bushing arch (31) is obliquely passed to both sides, by temporary steel support (33) and the supporting role of temporary steel support (34), improve the vertical bearing capacity of preliminary bracing (41), ensure that the stability in the large digging rear tunnel surrounding；
3) Super-large-section tunnel upper left quarter digs and preliminary bracing:
Start downward successively from left side haunch, segmentation digs country rock to setting contour line, applies preliminary bracing (4101), radial system anchor pole (4301) and lock foot anchoring stock (4201) in time, and its supporting parameter is identical with right side；The hole slag that excavation is formed laterally is discharged, and heap fills in existing tunnel, forms hole slag backfill (23), is conducive to digging the stability in the large of rear tunnel surrounding；
After above-mentioned excavation and support, apply 2 Pin I22 steelframe vertical supporting (44), its upper end is reliably welded with preliminary bracing (41), lower end is directly supported on the liner structure of existing tunnel, it is remarkably improved the vertical bearing capacity of preliminary bracing (41), after completing the conversion of vertical power transmission, dismountable temporary steel support (33) and (34), remove interim steel bushing arch (31).
Super-large-section tunnel drilling and blasting method the most according to claim 7 enlarging construction method in situ, it is characterised in that:
Construction method also includes the 4th step, follow-up dig and slag tap:
After forming the working space of B=4m width, add 2 faces, just can be similar with ordinary crossing driving, tunnel from centre to both sides, but it is different by vertical shaft mode of slagging tap from ordinary crossing, explosion on newly-increased face is slagged tap, laterally must discharge through the inside opening section of B=4m, owing to slag discharge efficiency is relatively low, upper right quarter and the upper left quarter of Super-large-section tunnel is only digged in the newly-increased scope of operation, its hole slag backfills in existing tunnel, both can save haul distance, is conducive to again digging the stability in the large of rear tunnel surrounding.
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| CN201610326430.1A CN105822311B (en) | 2016-05-17 | 2016-05-17 | The Super-large-section tunnel enlarging constructing structure in situ and construction method of the inside opening increase scope of operation |
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| CN201610326430.1A CN105822311B (en) | 2016-05-17 | 2016-05-17 | The Super-large-section tunnel enlarging constructing structure in situ and construction method of the inside opening increase scope of operation |
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Cited By (9)
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| CN107100655A (en) * | 2017-05-31 | 2017-08-29 | 中铁二十局集团第六工程有限公司 | Weak surrounding rock locally changes the simple temporary support system of arch and its applies method |
| CN107965325A (en) * | 2017-10-24 | 2018-04-27 | 济南城建集团有限公司 | Just branch bow member replaces construction method to a kind of small interval shallow tunnel |
| CN108843330A (en) * | 2018-07-05 | 2018-11-20 | 成都天佑智隧科技有限公司 | A kind of stratum active support and change method of Tunneling by mining method construction |
| CN109441476A (en) * | 2018-12-21 | 2019-03-08 | 中铁四局集团有限公司 | A kind of existing tunnel security protection Multifunctional bench of enlarging constructing tunnel in situ |
| CN109538219A (en) * | 2018-12-21 | 2019-03-29 | 中铁四局集团有限公司 | The enlarging large section in situ and partial excavation method in crushing hard rock tunnel |
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| CN109538219B (en) * | 2018-12-21 | 2020-10-20 | 中铁四局集团有限公司 | In-situ expansion super-large section and partial excavation method of broken hard rock tunnel |
| CN109630138A (en) * | 2018-12-21 | 2019-04-16 | 中铁四局集团有限公司 | The steelframe dike combined support partial excavation method of enlarging large section tunnel in situ |
| CN109538219A (en) * | 2018-12-21 | 2019-03-29 | 中铁四局集团有限公司 | The enlarging large section in situ and partial excavation method in crushing hard rock tunnel |
| CN109441476A (en) * | 2018-12-21 | 2019-03-08 | 中铁四局集团有限公司 | A kind of existing tunnel security protection Multifunctional bench of enlarging constructing tunnel in situ |
| CN109441476B (en) * | 2018-12-21 | 2024-04-26 | 中铁四局集团有限公司 | Existing tunnel safety protection multifunctional rack for in-situ extension tunnel construction |
| CN109594993A (en) * | 2019-01-23 | 2019-04-09 | 四川交通职业技术学院 | A kind of tunnel enlarging construction method in the case of uninterrupted traffic |
| CN112539075A (en) * | 2021-01-15 | 2021-03-23 | 福州大学 | Preset internal anchor rod structure for tunnel in-situ extension project and supporting method thereof |
| CN114151092A (en) * | 2021-11-19 | 2022-03-08 | 北京市轨道交通建设管理有限公司 | Tunnel expanding and excavating connecting device and tunnel expanding and excavating method |
| CN114151092B (en) * | 2021-11-19 | 2024-05-14 | 北京市轨道交通建设管理有限公司 | Tunnel expanding and excavating connecting device and tunnel expanding and excavating method |
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Effective date of registration: 20200615 Address after: 200040 No. 666, Gonghe new road, Jing'an District, Shanghai Co-patentee after: China Railway 15th Bureau Group Second Engineering Co.,Ltd. Patentee after: CHINA RAILWAY 15TH CONSTRUCTION BUREAU GROUP Co.,Ltd. Co-patentee after: Fujian Xiamen-Rongshan Expressway Zhanglong Section Extension Engineering Co.,Ltd. Co-patentee after: THE 5TH CONSTRUCTION COMPANY LTD. OF CHINA RAILWAY 15TH BUREAU GROUP Co.,Ltd. Address before: 200070 No. 666, Gonghe Road, Shanghai, Zhabei District Co-patentee before: China Railway 15th Bureau Group Second Engineering Co.,Ltd. Patentee before: CHINA RAILWAY 15TH CONSTRUCTION BUREAU GROUP Co.,Ltd. |