CN106351671A - Excavation and supporting structure for weak surrounding rock super-large cross-section tunnel and construction method thereof - Google Patents

Excavation and supporting structure for weak surrounding rock super-large cross-section tunnel and construction method thereof Download PDF

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Publication number
CN106351671A
CN106351671A CN201610901857.XA CN201610901857A CN106351671A CN 106351671 A CN106351671 A CN 106351671A CN 201610901857 A CN201610901857 A CN 201610901857A CN 106351671 A CN106351671 A CN 106351671A
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China
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supporting
bar
base tunnel
tunnel
excavation
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CN201610901857.XA
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Chinese (zh)
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CN106351671B (en
Inventor
申剑
陈德斌
夏真荣
肖承倚
吴秀雄
蒋志权
张健
朱东平
钟勇
刘云
周崇连
解振乙
王开荣
徐文
滕建毛
陈立家
颜桢伟
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中铁五局集团第五工程有限责任公司
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/10Lining 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
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/14Lining predominantly with metal
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/14Lining predominantly with metal
    • E21D11/18Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00Setting anchoring-bolts
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries

Abstract

The invention discloses anexcavation and supporting structure for a weak surrounding rock super-large cross-section tunnel and an operation method thereof. The weak surrounding rock super-large cross-section tunnel adopts six-step excavation and supporting for two side walls of an upper bench, and seven-step excavation and supporting based on a benching tunneling method are adopted for a lower bench. Before the excavation, an advanced small pipe is firstly adopted to perform an arch-part advanced support, and then a tunnel section is constructed in thirteen steps in a certain order. The excavation structure and method disclosed by the invention can ensure a large construction space for excavation, large-scale construction machinery can be introduced in each step, a plurality of construction sites can be constructed at the same time, so that high working efficiency is realized and construction progress is accelerated to a large extent, the number of temporary supports applied in a super-large cross-section construction process is reduced, the construction process is accelerated, temporary support removing process is simplified, safety is ensured, and efficiency is increased.

Description

A kind of weak surrounding rock large section tunnel excavation supporting structure and its construction method
Technical field
The present invention relates to a kind of weak surrounding rock large section tunnel excavation supporting structure and its construction method are and in particular to soft (maximum section is up to every linear meter(lin.m.) 365m for weak country rock, level country rock large section2) tunnel excavation support construction method.
Background technology
During large section Modelling of Tunnel Excavation in Soft Rock, traditional excavation method be two side-wall pilot tunnel, cd method, Crd method etc., for the tunnel of large section and country rock difference, two side-wall pilot tunnel, crd method have well adapting to property, but because facing When, support more, and tears that support is difficult open, construction risk is big;Each portion construction space is narrow and small, can only be constructed using small-sized machine, construction speed Degree is slow, and construction cost is high.
Content of the invention
The technical problem to be solved in the present invention is: provide a kind of weak surrounding rock large section tunnel excavation supporting structure and its Construction method, many to solve temporary support, tear support difficulty open, construction risk is big, and working space is narrow and small, and construction speed is slow, construction The problems such as high cost.
The technical scheme that the present invention takes is: a kind of weak surrounding rock large section tunnel excavation supporting structure, including top Supporting and bottom supporting, top supporting includes the left side supporting of base tunnel top bar, left side base tunnel is got out of a predicament or an embarrassing situation supporting, right side base tunnel Supporting that the supporting of top bar, right side base tunnel are got out of a predicament or an embarrassing situation, the supporting on mid-board top, the supporting of mid-board bottom, bottom supporting The supporting got out of a predicament or an embarrassing situation including the left side supporting of abutment wall top bar, left side abutment wall, the supporting of right side abutment wall top bar, under the abutment wall of right side The supporting of step, the supporting of the supporting, supporting that central core soil is got out of a predicament or an embarrassing situation and inverted arch of central core soil top bar, left side base tunnel Get out of a predicament or an embarrassing situation and excavate delayed 5m than left side base tunnel top bar, right side base tunnel top bar excavates delayed 45m than left side base tunnel top bar, right Side base tunnel is got out of a predicament or an embarrassing situation and is excavated delayed 50m than left side base tunnel top bar, and mid-board top is excavated delayed than left side base tunnel top bar 90m, delayed 95m is excavated than left side base tunnel top bar in mid-board bottom, and left side abutment wall top bar is excavated than left side base tunnel top bar Delayed 105m, left side abutment wall is got out of a predicament or an embarrassing situation and is excavated delayed 115m than left side base tunnel top bar, and right side abutment wall top bar is than left side base tunnel Top bar excavates delayed 110m, and right side abutment wall is got out of a predicament or an embarrassing situation and excavated delayed 120m than left side base tunnel top bar, and central core soil is appeared on the stage Rank excavates delayed 135m than left side base tunnel top bar, and central core soil is got out of a predicament or an embarrassing situation and excavated delayed 150m than left side base tunnel top bar, Inverted arch excavates delayed 155-160m than left side base tunnel top bar.
Preferably, the supporting of above-mentioned left side base tunnel top bar includes bow member one, lock foot anchoring stock one, erects support one temporarily and in advance should Power anchor cable one, the supporting that left side base tunnel is got out of a predicament or an embarrassing situation includes bow member two, lock foot anchoring stock two, erects support two, interim inverted arch stull steel temporarily Frame one and prestress anchorage cable two, the supporting preliminary bracing that the supporting of left side base tunnel top bar is got out of a predicament or an embarrassing situation with left side base tunnel forms closure Ring.
Preferably, the supporting of above-mentioned right side base tunnel top bar includes bow member three, lock foot anchoring stock three, prestress anchorage cable three and faces When perpendicular support three, the supporting that right side base tunnel is got out of a predicament or an embarrassing situation includes bow member four, lock foot anchoring stock four, prestress anchorage cable four, erects support four and temporarily Interim inverted arch stull steelframe two, the supporting preliminary bracing formation that the supporting of right side base tunnel top bar is got out of a predicament or an embarrassing situation with right side base tunnel is closed Cyclization.
Preferably, the supporting on above-mentioned mid-board top includes bow member five, is linked to be entirety with bow member one and bow member three.
Preferably, above-mentioned left side base tunnel top bar setting two bundle anchor cable one, left side base tunnel is got out of a predicament or an embarrassing situation and is arranged anchor cable two, right side Anchor cable three is restrainted in base tunnel top bar setting two, and left side base tunnel is got out of a predicament or an embarrassing situation and arranged anchor cable four.
Preferably, the supporting of above-mentioned left side abutment wall top bar includes bow member seven and lock foot anchoring stock one, and left side abutment wall is left office The supporting of rank includes bow member nine and lock foot anchoring stock two.
Preferably, the supporting of above-mentioned right side abutment wall top bar includes bow member eight and lock foot anchoring stock three, and right side abutment wall is left office The supporting of rank includes bow member ten and lock foot anchoring stock four.
Preferably, above-mentioned inverted arch supporting includes a steelframe at the beginning of inverted arch.
A kind of construction method of weak surrounding rock large section tunnel excavation supporting structure, weak surrounding rock large section tunnel is adopted Divide six-zone digging supporting with top bar double side wall, get out of a predicament or an embarrassing situation and divide seven excavation supportings using benching tunnelling method.Before tunnel excavation, in arch 144 ° of portion scope arranges advanced φ 42mm ductule and carries out arch advance support, afterwards according to certain order, tunnel cross-section is divided Cheng Shisan part is excavated, and specifically includes following steps:
Step one, ductule advance support act under, first excavate left side base tunnel top bar, in an approximate triangle, Bottom width 9.56m, high 4.55m, area 27m2, and timely During Initial Stage Construction supporting bow member one, lock foot anchoring stock one and median septum i18 are interim Perpendicular support one, and complete gunite concrete operation;
After step 2, delayed left side base tunnel top bar 5m, then excavate left side base tunnel get out of a predicament or an embarrassing situation, in approximate trapezoidal, a upper bottom Wide 9.56m, lower bottom width 11.61m, high 2.91m, area 31m2, the longitudinal mileage direction of left and right sides excavation got out of a predicament or an embarrassing situation by left side base tunnel must Must stagger construction, distance should be not less than 2m, timely During Initial Stage Construction supporting bow member two, lock foot anchoring stock two, median septum i18 erect support temporarily Two and bottom i18 interim inverted arch stull steelframes one, and complete gunite concrete operation, now, left side wall base tunnel has formed independence Closed-loop construct;
Step 3, after left side base tunnel top bar excavation supporting completes 35m, start construction left side base tunnel arch 3 hole prestressed anchor Rope, three hole prestress anchorage cables are considered as reserving apart from tunnel center line distance respectively 3.5m, 6.0m, 12.0m, anchor cable construction stand Muck removal, transport channel, complete to hole, cast anchor after left side anchor cable, slip casting, after tension process, left side wall base tunnel forms " looped cables Arch supporting construction ", " the looped cables arch supporting construction " of left side wall base tunnel should closely follow left side base tunnel face, with face distance Should control in 34-36m;
Step 4, after left side wall base tunnel forms complete " looped cables arch supporting construction " 10m, that is, left side wall base tunnel top bar is opened Dig supporting and complete 45m, start right side base tunnel top bar excavation supporting operation, in an approximate triangle, bottom width 9.56m is high 4.55m area, 27m2, timely During Initial Stage Construction supporting bow member three, lock foot anchoring stock three, median septum i18 erect support three, injection coagulation temporarily Native preliminary bracing operation, right side base tunnel top bar excavation, supporting, during propulsion, should ensure that left side wall base tunnel has all the time " the looped cables arch supporting construction " of molding, and advanced right side base tunnel top bar excavation supporting is not less than 10m;
After step 5, delayed right side base tunnel top bar 5m, that is, left side wall base tunnel top bar excavation supporting completes 50m, on the right side of excavation Base tunnel is got out of a predicament or an embarrassing situation, in approximate trapezoidal, upper bottom width 9.56m, lower bottom width 11.61m, high 2.91m, area 31m2, get out of a predicament or an embarrassing situation Left and right sides excavates longitudinal mileage direction and must stagger construction, and distance should be not less than 2m, timely During Initial Stage Construction supporting bow member four, locks foot Anchor pole four, median septum i18 erect support four and bottom i18 interim inverted arch stull steelframes two, gunite concrete preliminary bracing operation temporarily, Now, right side wall base tunnel has formed independent closed-loop construct;
Step 6, after right side base tunnel top bar excavation supporting completes 35m, that is, left side wall base tunnel top bar excavation supporting completes 80m, starts construction right side arch 3 hole prestress anchorage cable, three hole prestress anchorage cables apart from tunnel center line distance respectively 3.5m, 6.0m, 12.0m, anchor cable construction stand is considered as reserved muck removal, transport channel;Treat right side anchor cable complete to hole, cast anchor, slip casting, After tension process, right side wall base tunnel forms " looped cables arch supporting construction ";" the looped cables arch supporting construction " of right side wall base tunnel Should should control in 35m immediately following right side base tunnel face and face distance;
Step 7, right side wall base tunnel formed " looped cables arch supporting construction " 10m after, i.e. left side wall base tunnel top bar excavation supporting Complete 90m, start the excavation supporting operation of mid-board top, in approximate trapezoidal, upper bottom width 5.65m, lower bottom width 3.21m, High 4.73m, area 20m2, complete preliminary bracing bow member five and gunite concrete preliminary bracing operation;Then remove on mid-board Portion left and right side i18 erects support temporarily;
Step 8, delayed mid-board top 5m, that is, left side wall base tunnel top bar excavation supporting complete 95m, excavate mid-board bottom, In approximate trapezoidal, upper bottom width 3.21m, lower bottom width 2.76m, high 2.91m, area 7.5m2, before excavation, first remove mid-board Bottom left and right side i18 erects support and left and right sidewall base tunnel bottom i18 interim inverted arch stull temporarily;
After step 9, delayed mid-board bottom 10m, that is, left side wall base tunnel top bar excavation supporting completes 105m, and excavation supporting is left Abutment wall top bar, in approximate trapezoidal, upper bottom width 6.15m, lower bottom width 4.71m, high 3.59m, area 20m2, apply in time Preliminary bracing bow member seven, lock foot anchoring stock seven and gunite concrete preliminary bracing operation;
After step 10, delayed leftwall top bar 5m, that is, left side wall base tunnel top bar excavation supporting completes 110m, and excavation supporting is right Abutment wall top bar, in approximate trapezoidal, upper bottom width 6.15m, lower bottom width 4.71m, high 3.59m, area 20m2, apply in time Preliminary bracing bow member eight, lock foot anchoring stock eight and gunite concrete preliminary bracing operation;
Step 11, delayed leftwall top bar 10m, that is, left side wall base tunnel top bar excavation supporting complete 115m, excavation supporting Leftwall is got out of a predicament or an embarrassing situation, in approximate trapezoidal, upper bottom width 4.71m, lower bottom width 2.56m, high 3.86m, area 14m2, apply in time Make preliminary bracing bow member nine, lock foot anchoring stock nine and gunite concrete preliminary bracing operation;
Step 12, delayed RightWall top bar 10m, that is, left side wall base tunnel top bar excavation supporting complete 120m, excavation supporting RightWall is got out of a predicament or an embarrassing situation, in approximate trapezoidal, upper bottom width 4.71m, lower bottom width 2.56m, high 3.86m area 14m2, apply in time Make preliminary bracing bow member ten, lock foot anchoring stock ten and gunite concrete preliminary bracing operation;
Step 13, delayed right side abutment wall are got out of a predicament or an embarrassing situation 15m, and that is, left side wall base tunnel top bar excavation supporting completes 135m, in excavation Portion's Core Soil top bar, in approximate trapezoidal, upper bottom width 13.32m, lower bottom width 16.97m, high 3.59m area 54m2
Step 14, delayed central core earthen platform rank 15m, that is, left side wall base tunnel top bar excavation supporting complete 150m, in excavation Portion's Core Soil is got out of a predicament or an embarrassing situation, in approximate trapezoidal, upper bottom width 16.97m, lower bottom width 20.17m, high 3.13m, area 58m2
Step 15, delayed central core soil are got out of a predicament or an embarrassing situation 6m, and that is, left side wall base tunnel top bar excavation supporting completes 156m, and excavation is faced upward Arch, in an approximate triangle, bottom width 20.13m, high 2.59m, area 41m2, a steelframe at the beginning of inverted arch of primary support is installed, and When apply gunite concrete, complete tunnel cross-section single loop and excavate and first Zhi Zuoye, so circulate, complete whole tunnel excavation Supporting operation.
Beneficial effects of the present invention: compared with the technology such as existing two side-wall pilot tunnel, cd method, crd method, the effect of the present invention Fruit is as follows:
(1) construction space is big, and each step all can introduce large-scale construction equipment, the parallel operations of many scope of operations, and work efficiency is high, largely On accelerate construction speed;
2) decrease the quantity of temporary support in large section work progress, accelerate construction speed;
3) simplify temporary support and remove technique, both ensure that safety, and improve efficiency again.
Brief description
Fig. 1 is the total body construction schematic diagram of 13 excavation supporting methods;
Fig. 2 is left side base tunnel top bar excavation supporting construction schematic diagram;
Fig. 3 for left side base tunnel get out of a predicament or an embarrassing situation excavation supporting construction schematic diagram;
Fig. 4 is right side base tunnel top bar excavation supporting construction schematic diagram;
Fig. 5 for right side base tunnel get out of a predicament or an embarrassing situation excavation supporting construction schematic diagram;
Fig. 6 is mid-board top excavation supporting construction schematic diagram;
Fig. 7 is mid-board bottom excavation supporting construction schematic diagram;
Fig. 8 is left side abutment wall top bar excavation supporting construction schematic diagram;
Fig. 9 for left side abutment wall get out of a predicament or an embarrassing situation excavation supporting construction schematic diagram;
Figure 10 is right side abutment wall top bar excavation supporting construction schematic diagram;
Figure 11 for right side abutment wall get out of a predicament or an embarrassing situation excavation supporting construction schematic diagram;
Figure 12 is mid-board top excavation supporting construction schematic diagram;
Figure 13 is mid-board bottom excavation supporting construction schematic diagram;
Figure 14 is inverted arch excavation supporting construction schematic diagram;
Figure 15 is excavation supporting structure detailed maps.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment is described further to the present invention.
Embodiment 1: as shown in Fig. 1-Figure 15, a kind of weak surrounding rock large section tunnel excavation supporting structure, including top Supporting and bottom supporting, 2 supporting that top supporting includes the supporting of left side base tunnel top bar 1, left side base tunnel is got out of a predicament or an embarrassing situation, right side are led The hole supporting of top bar 3, right side base tunnel get out of a predicament or an embarrassing situation 4 supporting, the supporting on mid-board top 5, the supporting of mid-board bottom 6, under Portion's supporting includes the left side supporting of abutment wall top bar 7, left side abutment wall is got out of a predicament or an embarrassing situation 9 supporting, the supporting of right side abutment wall top bar 8, Right side abutment wall get out of a predicament or an embarrassing situation 10 supporting, the central core soil supporting of top bar 11, central core soil get out of a predicament or an embarrassing situation 12 supporting and face upward The supporting of arch 13, left side base tunnel is got out of a predicament or an embarrassing situation and 2 is excavated delayed 5m than left side base tunnel top bar 1, and right side base tunnel top bar 3 is led than left side Hole top bar 1 excavates delayed 45m, and right side base tunnel is got out of a predicament or an embarrassing situation and 4 excavated delayed 50m, mid-board top 5 than left side base tunnel top bar 1 Excavate delayed 90m than left side base tunnel top bar 1, mid-board bottom 6 is compared left side base tunnel top bar 1 and excavated delayed 95m, left side Wall top bar 7 excavates delayed 105m than left side base tunnel top bar 1, and left side abutment wall is got out of a predicament or an embarrassing situation 9 more stagnant than left side base tunnel top bar 1 is excavated 115m afterwards, right side abutment wall top bar 8 excavates delayed 110m than left side base tunnel top bar 1, and right side abutment wall is got out of a predicament or an embarrassing situation and 10 led than left side Hole top bar 1 excavates delayed 120m, and central core soil top bar 11 excavates delayed 135m, middle part core than left side base tunnel top bar 1 Cubsoil is got out of a predicament or an embarrassing situation and 12 is excavated delayed 150m than left side base tunnel top bar 1, and inverted arch 13 excavates delayed 155- than left side base tunnel top bar 1 160m.
Preferably, shown in reference picture 2- Fig. 3, the supporting of above-mentioned left side base tunnel top bar 1 includes bow member one 1-1, lock foot anchor Bar one 1-2, erect support one 1-4 and prestress anchorage cable one 1-3, base tunnel get out of a predicament or an embarrassing situation 2 supporting in left side includes bow member two 2-1, lock temporarily Foot anchor pole two 2-2, temporarily perpendicular support two 2-5, interim inverted arch stull steelframe one 2-4 and prestress anchorage cable two 2-3, left side base tunnel is appeared on the stage The get out of a predicament or an embarrassing situation 2 supporting preliminary bracing of the supporting of rank 1 and left side base tunnel forms closure ring.
Preferably, shown in reference picture 4- Fig. 5, the supporting of above-mentioned right side base tunnel top bar 3 includes bow member three 3-1, lock foot anchor Bar three 3-2, prestress anchorage cable three 3-3 and erect support three 3-4, base tunnel get out of a predicament or an embarrassing situation 4 supporting in right side includes bow member four 4-1, lock temporarily Foot anchor pole four 4-2, prestress anchorage cable four 4-3, temporarily perpendicular support four 4-5 and interim inverted arch stull steelframe two 4-4, on the base tunnel of right side The get out of a predicament or an embarrassing situation 4 supporting preliminary bracing of the supporting of step 3 and right side base tunnel forms closure ring.
Preferably, shown in reference picture 6- Fig. 7, the supporting on above-mentioned mid-board top 5 includes bow member five 5-1, with bow member one 1-1 It is linked to be entirety with bow member three 3-1, after the completion of delayed 1 90m in mid-board top 5 excavates, apply preliminary bracing bow member no 5-1 It is linked to be entirety with bow member one 1-1 and bow member three 3-1, and applies gunite concrete and form preliminary bracing, remove afterwards and erect support temporarily 1-4 and 3-4.
Preferably, shown in reference picture 2- Fig. 3 and shown in Fig. 4-Fig. 5, above-mentioned left side base tunnel top bar 1 setting two bundle anchor cable one 1-3, left side base tunnel is got out of a predicament or an embarrassing situation 2 setting anchor cable two 2-3, right side base tunnel top bar 3 setting two bundle anchor cable three 3-3, and left side is led Get out of a predicament or an embarrassing situation 4 setting anchor cable four 4-3 in hole.
Preferably, with reference to shown in Fig. 8 and Figure 10, the supporting of above-mentioned left side abutment wall top bar 7 includes bow member seven 7-1 and lock Foot anchor pole one 7-2, abutment wall get out of a predicament or an embarrassing situation 7 supporting in left side includes bow member nine 9-1 and lock foot anchoring stock two 9-2.
As shown in figure 12, delayed 1 135m of central core soil top bar 11 excavates.
As shown in figure 13, central core soil 12 delayed 1 150m that get out of a predicament or an embarrassing situation excavate.
Preferably, with reference to shown in Fig. 9 and Figure 11, the supporting of above-mentioned right side abutment wall top bar 8 includes bow member eight 8-1 and lock Foot anchor pole three 8-2, abutment wall get out of a predicament or an embarrassing situation 10 supporting in right side includes bow member ten 10-1 and lock foot anchoring stock four 10-2.
Preferably, with reference to shown in Figure 14, the supporting of above-mentioned inverted arch 13 includes a steelframe 13-1, delayed 1 of inverted arch 13 at the beginning of inverted arch 155m to 160m excavates, and after the completion of excavation, applies a steelframe 13-1 at the beginning of inverted arch, and applies gunite concrete in time, completes whole A just system closing cyclization.
Embodiment 2: a kind of construction method of weak surrounding rock large section tunnel excavation supporting structure, weak surrounding rock super large breaks Face tunnel divides six-zone digging supporting using top bar double side wall, gets out of a predicament or an embarrassing situation and divides seven excavation supportings using benching tunnelling method.Open in tunnel Before digging, advanced φ 42mm ductule 14 is set in 144 ° of arch scope and carries out arch advance support, afterwards according to certain order, will Tunnel cross-section is divided into 13 parts and is excavated, and specifically includes following steps:
Step one, ductule advance support act under, first excavate left side base tunnel top bar, in an approximate triangle, Bottom width 9.56m, high 4.55m, area 27m2, and timely During Initial Stage Construction supporting bow member one, lock foot anchoring stock one and median septum i18 are interim Perpendicular support one, and complete gunite concrete operation;
After step 2, delayed left side base tunnel top bar 5m, then excavate left side base tunnel get out of a predicament or an embarrassing situation, in approximate trapezoidal, a upper bottom Wide 9.56m, lower bottom width 11.61m, high 2.91m, area 31m2, the longitudinal mileage direction of left and right sides excavation got out of a predicament or an embarrassing situation by left side base tunnel must Must stagger construction, distance should be not less than 2m, timely During Initial Stage Construction supporting bow member two, lock foot anchoring stock two, median septum i18 erect support temporarily Two and bottom i18 interim inverted arch stull steelframes one, and complete gunite concrete operation, now, left side wall base tunnel has formed independence Closed-loop construct;
Step 3, after left side base tunnel top bar excavation supporting completes 35m, start construction left side base tunnel arch 3 hole prestressed anchor Rope, three hole prestress anchorage cables are considered as reserving apart from tunnel center line distance respectively 3.5m, 6.0m, 12.0m, anchor cable construction stand Muck removal, transport channel, complete to hole, cast anchor after left side anchor cable, slip casting, after tension process, left side wall base tunnel forms " looped cables Arch supporting construction ", " the looped cables arch supporting construction " of left side wall base tunnel should closely follow left side base tunnel face, with face distance Should control in 34-36m;
Step 4, after left side wall base tunnel forms complete " looped cables arch supporting construction " 10m, that is, left side wall base tunnel top bar is opened Dig supporting and complete 45m, start right side base tunnel top bar excavation supporting operation, in an approximate triangle, bottom width 9.56m is high 4.55m area, 27m2, timely During Initial Stage Construction supporting bow member three, lock foot anchoring stock three, median septum i18 erect support three, injection coagulation temporarily Native preliminary bracing operation, right side base tunnel top bar excavation, supporting, during propulsion, should ensure that left side wall base tunnel has all the time " the looped cables arch supporting construction " of molding, and advanced right side base tunnel top bar excavation supporting is not less than 10m;
After step 5, delayed right side base tunnel top bar 5m, that is, left side wall base tunnel top bar excavation supporting completes 50m, on the right side of excavation Base tunnel is got out of a predicament or an embarrassing situation, in approximate trapezoidal, upper bottom width 9.56m, lower bottom width 11.61m, high 2.91m, area 31m2, get out of a predicament or an embarrassing situation Left and right sides excavates longitudinal mileage direction and must stagger construction, and distance should be not less than 2m, timely During Initial Stage Construction supporting bow member four, locks foot Anchor pole four, median septum i18 erect support four and bottom i18 interim inverted arch stull steelframes two, gunite concrete preliminary bracing operation temporarily, Now, right side wall base tunnel has formed independent closed-loop construct;
Step 6, after right side base tunnel top bar excavation supporting completes 35m, that is, left side wall base tunnel top bar excavation supporting completes 80m, starts construction right side arch 3 hole prestress anchorage cable, three hole prestress anchorage cables apart from tunnel center line distance respectively 3.5m, 6.0m, 12.0m, anchor cable construction stand is considered as reserved muck removal, transport channel;Treat right side anchor cable complete to hole, cast anchor, slip casting, After tension process, right side wall base tunnel forms " looped cables arch supporting construction ";" the looped cables arch supporting construction " of right side wall base tunnel Should should control in 35m immediately following right side base tunnel face and face distance;
Step 7, right side wall base tunnel formed " looped cables arch supporting construction " 10m after, i.e. left side wall base tunnel top bar excavation supporting Complete 90m, start the excavation supporting operation of mid-board top, in approximate trapezoidal, upper bottom width 5.65m, lower bottom width 3.21m, High 4.73m, area 20m2, complete preliminary bracing bow member five and gunite concrete preliminary bracing operation;Then remove on mid-board Portion left and right side i18 erects support temporarily;
Step 8, delayed mid-board top 5m, that is, left side wall base tunnel top bar excavation supporting complete 95m, excavate mid-board bottom, In approximate trapezoidal, upper bottom width 3.21m, lower bottom width 2.76m, high 2.91m, area 7.5m2, before excavation, first remove mid-board Bottom left and right side i18 erects support and left and right sidewall base tunnel bottom i18 interim inverted arch stull temporarily;
After step 9, delayed mid-board bottom 10m, that is, left side wall base tunnel top bar excavation supporting completes 105m, and excavation supporting is left Abutment wall top bar, in approximate trapezoidal, upper bottom width 6.15m, lower bottom width 4.71m, high 3.59m, area 20m2, apply in time Preliminary bracing bow member seven, lock foot anchoring stock seven and gunite concrete preliminary bracing operation;
After step 10, delayed leftwall top bar 5m, that is, left side wall base tunnel top bar excavation supporting completes 110m, and excavation supporting is right Abutment wall top bar, in approximate trapezoidal, upper bottom width 6.15m, lower bottom width 4.71m, high 3.59m, area 20m2, apply in time Preliminary bracing bow member eight, lock foot anchoring stock eight and gunite concrete preliminary bracing operation;
Step 11, delayed leftwall top bar 10m, that is, left side wall base tunnel top bar excavation supporting complete 115m, excavation supporting Leftwall is got out of a predicament or an embarrassing situation, in approximate trapezoidal, upper bottom width 4.71m, lower bottom width 2.56m, high 3.86m, area 14m2, apply in time Make preliminary bracing bow member nine, lock foot anchoring stock nine and gunite concrete preliminary bracing operation;
Step 12, delayed RightWall top bar 10m, that is, left side wall base tunnel top bar excavation supporting complete 120m, excavation supporting RightWall is got out of a predicament or an embarrassing situation, in approximate trapezoidal, upper bottom width 4.71m, lower bottom width 2.56m, high 3.86m area 14m2, apply in time Make preliminary bracing bow member ten, lock foot anchoring stock ten and gunite concrete preliminary bracing operation;
Step 13, delayed right side abutment wall are got out of a predicament or an embarrassing situation 15m, and that is, left side wall base tunnel top bar excavation supporting completes 135m, in excavation Portion's Core Soil top bar, in approximate trapezoidal, upper bottom width 13.32m, lower bottom width 16.97m, high 3.59m area 54m2
Step 14, delayed central core earthen platform rank 15m, that is, left side wall base tunnel top bar excavation supporting complete 150m, in excavation Portion's Core Soil is got out of a predicament or an embarrassing situation, in approximate trapezoidal, upper bottom width 16.97m, lower bottom width 20.17m, high 3.13m, area 58m2
Step 15, delayed central core soil are got out of a predicament or an embarrassing situation 6m, and that is, left side wall base tunnel top bar excavation supporting completes 156m, and excavation is faced upward Arch, in an approximate triangle, bottom width 20.13m, high 2.59m, area 41m2, a steelframe at the beginning of inverted arch of primary support is installed, and When apply gunite concrete, complete tunnel cross-section single loop and excavate and first Zhi Zuoye, so circulate, complete whole tunnel excavation Supporting operation.
The above, the only specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, and any Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, all should contain Cover within protection scope of the present invention, therefore, protection scope of the present invention should be defined by described scope of the claims.

Claims (9)

1. a kind of weak surrounding rock large section tunnel excavation supporting structure it is characterised in that: include top supporting and bottom supporting, Top supporting includes the supporting in left side base tunnel top bar (1), left side base tunnel the is got out of a predicament or an embarrassing situation supporting of (2), right side base tunnel top bar (3) Supporting, right side base tunnel get out of a predicament or an embarrassing situation the supporting of (4), the supporting of mid-board top (5), the supporting of mid-board bottom (6), bottom is propped up The supporting of (9) that shield includes the supporting in left side abutment wall top bar (7), left side abutment wall is got out of a predicament or an embarrassing situation, the propping up of right side abutment wall top bar (8) Shield, right side abutment wall get out of a predicament or an embarrassing situation (10) supporting, central core soil top bar (11) supporting, central core soil get out of a predicament or an embarrassing situation (12) Supporting and the supporting of inverted arch (13), left side base tunnel get out of a predicament or an embarrassing situation (2) ratio left side base tunnel top bar (1) excavate delayed 5m, right side base tunnel Top bar (3) excavates delayed 45m than left side base tunnel top bar (1), and right side base tunnel gets out of a predicament or an embarrassing situation (4) than left side base tunnel top bar (1) Excavate delayed 50m, mid-board top (5) excavate delayed 90m than left side base tunnel top bar (1), and mid-board bottom (6) lead than left side Delayed 95m is excavated in hole top bar (1), and delayed 105m, left side are excavated than left side base tunnel top bar (1) in left side abutment wall top bar (7) Abutment wall get out of a predicament or an embarrassing situation 9 ratio left side base tunnel top bar (1) excavate delayed 115m, right side abutment wall top bar (8) is than left side base tunnel top bar (1) excavate delayed 110m, right side abutment wall get out of a predicament or an embarrassing situation (10) ratio left side base tunnel top bar (1) excavate delayed 120m, central core soil Top bar (11) than left side base tunnel top bar (1) excavate delayed 135m, central core soil get out of a predicament or an embarrassing situation (12) appear on the stage than left side base tunnel Rank (1) excavates delayed 150m, and inverted arch (13) excavates delayed 155-160m than left side base tunnel top bar (1).
2. a kind of weak surrounding rock large section tunnel excavation supporting structure according to claim 1 it is characterised in that: left side The supporting of base tunnel top bar (1) includes bow member one (1-1), lock foot anchoring stock one (1-2), erects support one (1-4) and prestressed anchor temporarily Rope one (1-3), left side base tunnel get out of a predicament or an embarrassing situation (2) supporting include bow member two (2-1), lock foot anchoring stock two (2-2), temporarily erect support two (2-5), interim inverted arch stull steelframe one (2-4) and prestress anchorage cable two (2-3), the supporting in left side base tunnel top bar (1) and a left side Side base tunnel get out of a predicament or an embarrassing situation (2) supporting preliminary bracing formed closure ring.
3. a kind of weak surrounding rock large section tunnel excavation supporting structure according to claim 1 it is characterised in that: right side The supporting of base tunnel top bar (3) includes bow member three (3-1), lock foot anchoring stock three (3-2), prestress anchorage cable three (3-3) and erects temporarily Support three (3-4), base tunnel the get out of a predicament or an embarrassing situation supporting of (4) in right side includes bow member four (4-1), lock foot anchoring stock four (4-2), prestress anchorage cable four (4-3), erect support four (4-5) and interim inverted arch stull steelframe two (4-4), the supporting on right side base tunnel top bar (3) and right side temporarily Base tunnel get out of a predicament or an embarrassing situation (4) supporting preliminary bracing formed closure ring.
4. a kind of weak surrounding rock large section tunnel excavation supporting structure according to claim 1 it is characterised in that: in every The supporting on wall top (5) includes bow member five (5-1), is linked to be entirety with bow member one (1-1) and bow member three (3-1).
5. a kind of weak surrounding rock large section tunnel excavation supporting structure according to claim 1 it is characterised in that: left side Base tunnel top bar (1) setting two bundle anchor cable one (1-3), left side base tunnel get out of a predicament or an embarrassing situation (2) setting anchor cable two (2-3), on the base tunnel of right side Step (3) setting two bundle anchor cable three (3-3), and left side base tunnel get out of a predicament or an embarrassing situation (4) setting anchor cable four (4-3).
6. a kind of weak surrounding rock large section tunnel excavation supporting structure according to claim 1 it is characterised in that: left side The supporting of abutment wall top bar (7) includes bow member seven (7-1) and lock foot anchoring stock one (7-2), and left side abutment wall is got out of a predicament or an embarrassing situation the supporting of (7) Including bow member nine (9-1) and lock foot anchoring stock two (9-2).
7. a kind of weak surrounding rock large section tunnel excavation supporting structure according to claim 1 it is characterised in that: right side The supporting of abutment wall top bar (8) includes bow member eight (8-1) and lock foot anchoring stock three (8-2), right side abutment wall get out of a predicament or an embarrassing situation (10) Shield includes bow member ten (10-1) and lock foot anchoring stock four (10-2).
8. a kind of weak surrounding rock large section tunnel excavation supporting structure according to claim 1 it is characterised in that: inverted arch (13) supporting includes a steelframe (13-1) at the beginning of inverted arch.
9. the construction party according to a kind of arbitrary described weak surrounding rock large section tunnel excavation supporting structure of claim 1-3 Method it is characterised in that: weak surrounding rock large section tunnel divides six-zone digging supporting using top bar double side wall, gets out of a predicament or an embarrassing situation and adopts platform Rank method divides seven excavation supportings;
Before tunnel excavation, advanced φ 42mm ductule (14) is set in 144 ° of arch scope and carries out arch advance support, afterwards According to certain order, tunnel cross-section is divided into 13 parts and is excavated, specifically include following steps:
Step one, ductule advance support act under, first excavate left side base tunnel top bar, in an approximate triangle, Bottom width 9.56m, high 4.55m, area 27m2, and timely During Initial Stage Construction supporting bow member one, lock foot anchoring stock one and median septum i18 are interim Perpendicular support one, and complete gunite concrete operation;
After step 2, delayed left side base tunnel top bar 5m, then excavate left side base tunnel get out of a predicament or an embarrassing situation, in approximate trapezoidal, a upper bottom Wide 9.56m, lower bottom width 11.61m, high 2.91m, area 31m2, the longitudinal mileage direction of left and right sides excavation got out of a predicament or an embarrassing situation by left side base tunnel must Must stagger construction, distance should be not less than 2m, timely During Initial Stage Construction supporting bow member two, lock foot anchoring stock two, median septum i18 erect support temporarily Two and bottom i18 interim inverted arch stull steelframes one, and complete gunite concrete operation, now, left side wall base tunnel has formed independence Closed-loop construct;
Step 3, after left side base tunnel top bar excavation supporting completes 35m, start construction left side base tunnel arch 3 hole prestressed anchor Rope, three hole prestress anchorage cables are considered as reserving apart from tunnel center line distance respectively 3.5m, 6.0m, 12.0m, anchor cable construction stand Muck removal, transport channel, complete to hole, cast anchor after left side anchor cable, slip casting, after tension process, left side wall base tunnel forms " looped cables Arch supporting construction ", " the looped cables arch supporting construction " of left side wall base tunnel should closely follow left side base tunnel face, with face distance Should control in 34-36m;
Step 4, after left side wall base tunnel forms complete " looped cables arch supporting construction " 10m, that is, left side wall base tunnel top bar is opened Dig supporting and complete 45m, start right side base tunnel top bar excavation supporting operation, in an approximate triangle, bottom width 9.56m is high 4.55m area, 27m2, timely During Initial Stage Construction supporting bow member three, lock foot anchoring stock three, median septum i18 erect support three, injection coagulation temporarily Native preliminary bracing operation, right side base tunnel top bar excavation, supporting, during propulsion, should ensure that left side wall base tunnel has all the time " the looped cables arch supporting construction " of molding, and advanced right side base tunnel top bar excavation supporting is not less than 10m;
After step 5, delayed right side base tunnel top bar 5m, that is, left side wall base tunnel top bar excavation supporting completes 50m, on the right side of excavation Base tunnel is got out of a predicament or an embarrassing situation, in approximate trapezoidal, upper bottom width 9.56m, lower bottom width 11.61m, high 2.91m, area 31m2, get out of a predicament or an embarrassing situation Left and right sides excavates longitudinal mileage direction and must stagger construction, and distance should be not less than 2m, timely During Initial Stage Construction supporting bow member four, locks foot Anchor pole four, median septum i18 erect support four and bottom i18 interim inverted arch stull steelframes two, gunite concrete preliminary bracing operation temporarily, Now, right side wall base tunnel has formed independent closed-loop construct;
Step 6, after right side base tunnel top bar excavation supporting completes 35m, that is, left side wall base tunnel top bar excavation supporting completes 80m, starts construction right side arch 3 hole prestress anchorage cable, three hole prestress anchorage cables apart from tunnel center line distance respectively 3.5m, 6.0m, 12.0m, anchor cable construction stand is considered as reserved muck removal, transport channel;Treat right side anchor cable complete to hole, cast anchor, slip casting, After tension process, right side wall base tunnel forms " looped cables arch supporting construction ";" the looped cables arch supporting construction " of right side wall base tunnel Should should control in 35m immediately following right side base tunnel face and face distance;
Step 7, right side wall base tunnel formed " looped cables arch supporting construction " 10m after, i.e. left side wall base tunnel top bar excavation supporting Complete 90m, start the excavation supporting operation of mid-board top, in approximate trapezoidal, upper bottom width 5.65m, lower bottom width 3.21m, High 4.73m, area 20m2, complete preliminary bracing bow member five and gunite concrete preliminary bracing operation;Then remove on mid-board Portion left and right side i18 erects support temporarily;
Step 8, delayed mid-board top 5m, that is, left side wall base tunnel top bar excavation supporting complete 95m, excavate mid-board bottom, In approximate trapezoidal, upper bottom width 3.21m, lower bottom width 2.76m, high 2.91m, area 7.5m2, before excavation, first remove mid-board Bottom left and right side i18 erects support and left and right sidewall base tunnel bottom i18 interim inverted arch stull temporarily;
After step 9, delayed mid-board bottom 10m, that is, left side wall base tunnel top bar excavation supporting completes 105m, and excavation supporting is left Abutment wall top bar, in approximate trapezoidal, upper bottom width 6.15m, lower bottom width 4.71m, high 3.59m, area 20m2, apply in time Preliminary bracing bow member seven, lock foot anchoring stock seven and gunite concrete preliminary bracing operation;
After step 10, delayed leftwall top bar 5m, that is, left side wall base tunnel top bar excavation supporting completes 110m, and excavation supporting is right Abutment wall top bar, in approximate trapezoidal, upper bottom width 6.15m, lower bottom width 4.71m, high 3.59m, area 20m2, apply in time Preliminary bracing bow member eight, lock foot anchoring stock eight and gunite concrete preliminary bracing operation;
Step 11, delayed leftwall top bar 10m, that is, left side wall base tunnel top bar excavation supporting complete 115m, excavation supporting Leftwall is got out of a predicament or an embarrassing situation, in approximate trapezoidal, upper bottom width 4.71m, lower bottom width 2.56m, high 3.86m, area 14m2, apply in time Make preliminary bracing bow member nine, lock foot anchoring stock nine and gunite concrete preliminary bracing operation;
Step 12, delayed RightWall top bar 10m, that is, left side wall base tunnel top bar excavation supporting complete 120m, excavation supporting RightWall is got out of a predicament or an embarrassing situation, in approximate trapezoidal, upper bottom width 4.71m, lower bottom width 2.56m, high 3.86m area 14m2, apply in time Make preliminary bracing bow member ten, lock foot anchoring stock ten and gunite concrete preliminary bracing operation;
Step 13, delayed right side abutment wall are got out of a predicament or an embarrassing situation 15m, and that is, left side wall base tunnel top bar excavation supporting completes 135m, in excavation Portion's Core Soil top bar, in approximate trapezoidal, upper bottom width 13.32m, lower bottom width 16.97m, high 3.59m area 54m2
Step 14, delayed central core earthen platform rank 15m, that is, left side wall base tunnel top bar excavation supporting complete 150m, in excavation Portion's Core Soil is got out of a predicament or an embarrassing situation, in approximate trapezoidal, upper bottom width 16.97m, lower bottom width 20.17m, high 3.13m, area 58m2
Step 15, delayed central core soil are got out of a predicament or an embarrassing situation 6m, and that is, left side wall base tunnel top bar excavation supporting completes 156m, and excavation is faced upward Arch, in an approximate triangle, bottom width 20.13m, high 2.59m, area 41m2, a steelframe at the beginning of inverted arch of primary support is installed, and When apply gunite concrete, complete tunnel cross-section single loop and excavate and first Zhi Zuoye, so circulate, complete whole tunnel excavation Supporting operation.
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