CN103195432A - Weak surrounding rock, tunnel intersection and arc-shaped pilot tunnel construction method - Google Patents

Weak surrounding rock, tunnel intersection and arc-shaped pilot tunnel construction method Download PDF

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Publication number
CN103195432A
CN103195432A CN2013100740266A CN201310074026A CN103195432A CN 103195432 A CN103195432 A CN 103195432A CN 2013100740266 A CN2013100740266 A CN 2013100740266A CN 201310074026 A CN201310074026 A CN 201310074026A CN 103195432 A CN103195432 A CN 103195432A
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China
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intersection
construction
hole
supporting
arc base
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CN2013100740266A
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Chinese (zh)
Inventor
陈汉
徐冬青
杨金有
徐高山
杨志安
庞前凤
杨成宁
张明睿
武安
张峰辉
王昌贵
熊文标
徐小燕
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中铁二十二局集团第一工程有限公司
中铁二十二局集团有限公司
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Priority to CN2013100740266A priority Critical patent/CN103195432A/en
Publication of CN103195432A publication Critical patent/CN103195432A/en

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Abstract

The invention discloses a weak surrounding rock, tunnel intersection and arc-shaped pilot tunnel construction method. The method is characterized by consisting of the following steps: (1) excavating and supporting a mouth of a transverse hole; (2) constructing an advancing large pipe roof; (3) excavating and supporting a body of the transverse hole; (4) performing transverse hole inverted arch construction and bottom plate construction; (5) performing intersection door opening construction; (6) performing direct top brushing type excavation and supporting on an arc-shaped pilot tunnel; (7) mounting and supporting an upper guide arch frame of a front hole; (8) disassembling the temporary support of the arc-shaped pilot tunnel; (9) excavating and supporting the front hole by a step method; (10) constructing lining reinforced concrete on the body of the transverse hole; (11) excavating and supporting the front hole and adding a temporary inverted arch; (12) constructing a front hole inverted arch and adding a temporary cross brace; (13) constructing an inverted arch on the intersection front hole; (14) constructing lining reinforced concrete on the intersection; and (15) shifting to normal construction of the front hole. The arc-shaped pilot tunnel construction section is smaller than the front hole excavating section; the potential safety hazards of the arch change of the weak surrounding rock are avoided; the temporary work amount is small; the construction efficiency is high; the transverse hole at the intersection does not climb; and the stressed effect of the special-shaped arch frame of the front hole is good.

Description

A kind of Support System in Soft Rock Tunnels intersection arc base tunnel job practices
Technical field
The present invention relates to a kind of Support System in Soft Rock Tunnels intersection arc base tunnel job practices.
Background technology
Along with the development of Chinese national economy and technology, infrastructures such as China's traffic have welcome new development peak period, and the development of traffic engineering such as railway, highway rapidly.Engineering such as current rail, highway is for satisfying the needs of place, duration and environmental protection etc., a large amount of situations that adopt the intersection tunnel construction in the constructing tunnel.In the intersection hole of tunnel section construction, the excavation in construction hole, back usually causes the country rock in construction hole and the disturbance of structure earlier, and influence is the stability in construction hole earlier, even the unstable failure of the hole structure that causes constructing in advance.Equally, after build the hole structure environment be the established tunnel caused secondary state of stress of constructing in advance, the construction of elder generation's built tunnel is most important equally to the stability of back built tunnel, therefore, intersect in the tunnel construction, the influence in two holes is mutual, guarantee the stability of cross tunnel, need influencing each other of network analysis country rock and cross tunnel construction, rationally arrange sequence of construction.
Summary of the invention
Technical problem to be solved by this invention provides a kind of Support System in Soft Rock Tunnels intersection arc base tunnel job practices, has solved the problems referred to above.
Technical problem to be solved by this invention is achieved through the following technical solutions:
A kind of Support System in Soft Rock Tunnels intersection arc base tunnel job practices is characterized in that: be made up of following steps: (1) Heng Dong hole excavation and supporting; (2) implement to do leading bassoon canopy; (3) horizontal hole barrel excavation and supporting; (4) horizontal hole inverted arch construction and base plate construction; (5) intersection door opening construction; (6) the arc base tunnel formula of directly caunching is excavated and supporting; (7) Zheng Dongshang leads bow member installation and supporting; (8) remove the temporary lining of arc base tunnel; (9) benching tunnelling method is implemented the just wide open supporting of digging; (10) perform horizontal hole barrel lining cutting steel bar concrete; (11) just wide openly dig supporting and add interim inverted arch; (12) perform positive hole inverted arch, and add false stull; (13) perform positive hole, intersection inverted arch; (14)) perform intersection lining cutting steel bar concrete; (15) change positive hole normal construction over to.
Described bassoon canopy directly sets a ring in arch, Heng Dong hole, pipe canopy circumferential distance 0.5m, and every 20m is long, and leading the reinforcing implemented in horizontal hole and intersection part.
Benching tunnelling method construction, the supporting of steel bow member are adopted in described horizontal hole; Changeover portion steel bow member adopts fan-shaped layout; This fan-shaped part steel bow member basis adopts C30 steel concrete to enlarge the basis, and arch springing is directly imbedded in the concrete.
In the horizontal cavity portion minor face 3m scope of intersection, preliminary bracing thickness is increased to 35cm, to increase the bearing capacity of intersection part.
Described whole horizontal hole addition inverted arch in time seals into ring; When inverted arch excavates, face is carried out linked network, and spray the thick C20 concrete sealing of 10cm.
Describedly at Heng Dong and Zheng Dong intersection section door frame is set, the door frame normal is parallel with positive hole center line, weld type gooseneck on this door frame, and at crossbeam bolts at two ends connecting-type steel post, for positive hole steelframe provides the platform of stopping over.
Described horizontal hole enters positive hole and adopts the arc base tunnel, and the supporting of temporary steel bow member is adopted in the supporting of arc base tunnel, and laterally the temporary steel bow member is arranged on steel bow member top, positive hole, and the control of arc base tunnel excavation face is dug 30cm on the face just wide open, and preliminary bracing is as permanent protection.
After the construction of described arc base tunnel is finished, begin the supporting of topping bar of positive hole, positive hole steel bow member is installed, positive hole steel bow member base support is on rock mass or horizontal portal frame crossbeam, and special-shaped bow member length and arc are adjusted accordingly.
The temporary lining of described arc base tunnel and positive hole 3.5m scope are topped bar after supporting finishes, and remove the vertical temporary steel bow member of arc base tunnel, change the construction of positive hole over to;
The construction of described positive hole takes benching tunnelling method to reserve the construction of core local method, earlier by arc base tunnel position to little mileage direction construction to horizontal hole minor face, finish the preliminary bracing of topping bar, about stagger and fall step, finish the preliminary bracing of getting out of a predicament or an embarrassing situation; Again to the construction of big mileage direction to horizontal hole long limit, finish the preliminary bracing of topping bar, about stagger and fall step, finish the preliminary bracing of getting out of a predicament or an embarrassing situation;
After the positive cavity portion working space in intersection provides, the horizontal cavity portion lining cutting in the intersection of in time constructing, and guarantee to top bar face apart from being no more than 25m apart from positive hole.
The just wide open supporting employing benching tunnelling method that digs adds interim inverted arch, after 25m formation working space is finished in the construction of topping bar, suspend the construction of topping bar, carry out middle bench excavation, supporting, the bow member of topping bar be connected to middle step, middle step construction apart from top bar 5m apart from the time, step construction in the time-out, get out of a predicament or an embarrassing situation excavation, supporting are connected to bow member and get out of a predicament or an embarrassing situation, and form the construction of three benching tunnelling methods.
Described positive hole inverted arch excavation supporting takes to add false stull, get out of a predicament or an embarrassing situation construction apart from step 5m apart from the time, stop barrel excavation, branch carries out inverted arch, fill concrete construction;
Positive hole, intersection inverted arch excavation supporting is constructed to little mileage direction from big mileage, excavates 5 Pin steel bow members at every turn, adds false stull behind the excavation, in time seals into ring;
After the positive cavity portion inverted arch in intersection applies and finishes, apply the positive cavity portion lining cutting in intersection immediately.
During described horizontal hole construction, inverted arch at the bottom of the tunnel is set;
After caunching and finish in the intersection, directly enter the construction of positive hole, should preferentially apply horizontal hole and the barrel lining cutting of the positive hole of intersection section.
Of the present invention have a following beneficial effect:
There is following advantage in the scheme that Support System in Soft Rock Tunnels of the present invention intersection construction takes the arc base tunnel directly to caunch, more traditional gradual change horn mouth scheme and the little pilot tunnel scheme of caunching of turning of caunching:
(1) arc base tunnel construction section is much smaller than the just wide open section that digs, and has avoided weak surrounding rock to change the potential safety hazard that arch exists, safety factor height simultaneously.
(2) supporting of steel bow member is adopted in the temporary lining of arc base tunnel, and no longer remove the bow member disposable section top, positive hole that is installed in arch, removes during the construction of the positive hole of column bow member.The temporary works amount is little, and construction cost is low.
(3) directly form the operating mode of positive hole three step operations after caunch and finish in the intersection, the efficiency of construction height.
(4) intersection Heng Dong does not climb, and the special-shaped bow member stressed effect in positive hole is good.
After Support System in Soft Rock Tunnels arc base tunnel construction technology is adopted in the horizontal hole of tunnel 1#, the special Guizhou Duan Gaojia of Shanghai elder brother visitor village, improved the force-bearing situation of excavation back tunnel surrounding, reduce distortion and the displacement in tunnel, saved the duration, obtained remarkable economical and social benefit.The economic benefit of intersection, tunnel construction mainly is divided into two parts, and the one, temporary lining and the demolition cost in main hole advanced in the intersection, and the 2nd, the expense of saving the duration.Because traditional gradual change horn mouth enters the hole and generally need enlarge horizontal hole section in advance, therefore main cavity portion needs the extra steelframe supporting expense that increases, adopt the construction of arc pilot tunnel method to compare with traditional gradual change horn mouth method, the intersection is advanced temporary lining and the demolition cost in main hole and is saved 51.3 ten thousand yuan approximately, this worker method was only just finished the intersection with 42 days in the horizontal hole of 1#, Gao Jiatun tunnel and is handled, enter the hole than traditional gradual change horn mouth and saved approximately 18 days, about 34.2 ten thousand yuan of cost saving amounts to about 85.5 ten thousand yuan of cost saving.Because tunnel, high family village is the specially controlled engineering of Guizhou section of Shanghai elder brother visitor, reduced the duration of critical circuits by adopting Support System in Soft Rock Tunnels arc base tunnel construction technology, for special normally being open to traffic of Shanghai elder brother visitor provides guarantee, obtain the good social benefit.
Description of drawings
Fig. 1 construction flow chart of the present invention
The fan-shaped transition plane figure of the horizontal hole of Fig. 2 the present invention bow member
The horizontal portal shelf structure of Fig. 3 the present invention schematic diagram
Fig. 4 Heng Dong of the present invention intersection arc base tunnel construction schematic diagram
Fig. 5 Heng Dong of the present invention intersection arc base tunnel supporting schematic diagram
The horizontal hole of Fig. 6 the present invention changes working drawing behind the positive hole over to
As shown in the figure, 1-changeover portion steel bow member, 2-arc base tunnel, the positive hole of 3-steel bow member crossbeam, the positive hole of 4-steel bow member foothold, tread in the 5-, the horizontal hole of 6-steel bow member, the horizontal hole of 7-lining concrete, 8-cheats the bottom surface, 9-arc base tunnel pillar, the 10-bow member of topping bar in positive hole, the positive hole of 11-excavation line, positive hole, 12-intersection lining concrete, the highest vault line of 13-arc base tunnel
The specific embodiment
Shown in Fig. 1-6, the intersection constructure scheme comprises three parts, is respectively the horizontal cavity portion constructure scheme in intersection, the positive cavity portion constructure scheme in intersection, positive hole constructure scheme.
Characteristics according to Heng Dong intersection, tunnel section weak surrounding rock, shallow embedding bias voltage, by comparative analysis gradual change horn mouth the caunch horizontal hole climbing of method, intersection directly caunch pluses and minuses and the scope of application of job practices such as method, propose the arc pilot tunnel method and directly caunch, do not turn and directly enter the job practices in main hole.By optimizing horizontal hole constructure scheme; In conjunction with intersection i iron portal-framed structure support system; Adopt arc pilot tunnel method construction intersection, and form positive hole three step construction operating modes, guaranteed horizontal hole, tunnel safety, passed through intersection section construction smoothly, fast.
The horizontal cavity portion construction in intersection case:
(1) advance support: because horizontal hole barrel length is shorter, directly set a ring φ 108 bassoon canopies in arch, Heng Dong hole, pipe canopy circumferential distance 0.5m, every 20m is long, amounts to 26, and leading the reinforcing implemented in horizontal hole and intersection part.
(2) steel bow member: benching tunnelling method construction, the supporting of I20 steel bow member, bow member spacing 60cm are adopted in horizontal hole.Changeover portion steel bow member adopts fan-shaped layout, and wherein the long 7m of minor face grows length of side 14m.Horizontal hole minor face steel bow member spacing 40cm, long limit 10 Pin steel bow member spacing 100cm, 8 Pin steel bow member spacing 60cm.Fan-shaped part steel bow member basis adopts C30 steel concrete to enlarge the basis, and arch springing is directly imbedded in the concrete.Ditch side steel bow member enlarges the basis and deepens 30cm, to eliminate the ditch to the influence on bow member basis.
(3) just prop up concrete: in the horizontal cavity portion minor face 3m scope of intersection (corresponding long edge lengths 4.8m), preliminary bracing thickness is increased to 35cm, to increase the bearing capacity of intersection part.
(4) inverted arch construction: complete horizontal hole addition inverted arch, in time seal into ring, with the globality of increase supporting, and limit the displacement in horizontal hole.When inverted arch excavates, face is carried out linked network, the net sheet adopts φ 8 round steel, and mesh spacing 20cm * 20cm sprays the thick C20 concrete sealing of 10cm.
(5) lining concrete: lining concrete thickness 40cm, adopt C30 steel concrete.The inside and outside main muscle of lining cutting reinforcing bar adopts Φ 22 screw-thread steels, longitudinal pitch 20cm, and hoop single hoop muscle adopts Φ 14 screw-thread steels, spacing 250mm.
(6) portal-framed structure: lead the problem that the steel bow member is stopped over for solving on the positive hole, intersection, at Heng Dong and Zheng Dong intersection section door frame is set, for positive hole steelframe provides the platform of stopping over.In Heng Dong and Zheng Dong intersection section, frame founds 3 Pin I20a steel bow members, and steel bow member normal is parallel with positive hole center line, at this steel bow member welding I25a shaped steel crossbeam, and at crossbeam bolts at two ends connection I25a shaped steel column, for positive hole steelframe provides the platform of stopping over.As shown in Figure 3.
(7) drainage measure
By collecting well is set near face, arrange 2~4 high-power suction pumps that water is extracted in the Heng Dong gutter, by the gutter water is discharged outside the hole.
The positive cavity portion constructure scheme in intersection
(1) arc base tunnel construction: horizontal hole enters positive hole and adopts the arc base tunnel, drill bursting construction, and excavator is taken off quarrel, and indivedual positions are manually held pneumatic pick and are had a shave.Arc base tunnel section 3.5m (wide) * 4m (height), the supporting of temporary steel bow member is adopted in the base tunnel supporting, and laterally the temporary steel bow member is arranged on steel bow member top, positive hole, and the control of arc base tunnel excavation face is dug 30cm on the face just wide open, and preliminary bracing is as permanent protection.Steel bow member model I18, spacing 1m, vertical bow member base support sees Fig. 4, Fig. 5 for details on rock mass.
(2) the intersection Zheng Dong supporting of topping bar: after the construction of arc base tunnel is finished, begin the supporting of topping bar of positive hole, the positive hole of 7 Pin steel bow member (steel bow member spacing 60cm) can be installed, positive hole, left side bow member base support is on rock mass, positive hole, right side bow member base support is on horizontal portal frame crossbeam, and the special-shaped bow member length in right side and arc are adjusted accordingly.
(3) change the construction of positive hole over to: the temporary lining of arc base tunnel and positive hole 3.5m scope are topped bar after supporting finishes, and remove the vertical temporary steel bow member of arc base tunnel, change the construction of positive hole over to.
Positive hole takes benching tunnelling method to reserve the construction of core local method, earlier by arc base tunnel position to little mileage direction construction to horizontal hole minor face, finish the preliminary bracing of topping bar, about stagger and fall step, finish the preliminary bracing of getting out of a predicament or an embarrassing situation.Again to the construction of big mileage direction to horizontal hole long limit, finish the preliminary bracing of topping bar, about stagger and fall step, finish the preliminary bracing of getting out of a predicament or an embarrassing situation.
(4) the horizontal cavity portion lining construction in intersection: after the positive cavity portion working space in intersection provided, the horizontal cavity portion lining cutting in the intersection of in time constructing guaranteed to top bar face apart from being no more than 25m apart from positive hole.
Positive hole constructure scheme, see Fig. 6:
(1) just wide openly digs supporting: just wide openly dig supporting and adopt benching tunnelling method to add interim inverted arch, guarantee to excavate the lateral stability of rear space.The construction of topping bar suspends the construction of topping bar after finishing and forming working space about 25m, carries out middle bench excavation, supporting, and the bow member of topping bar is connected to middle step.In step construction apart from top bar 5m apart from the time, step construction in the time-out, get out of a predicament or an embarrassing situation excavation, supporting are connected to bow member and get out of a predicament or an embarrassing situation, and form three benching tunnelling methods and construct.
(2) positive hole inverted arch excavation supporting: positive hole inverted arch excavation supporting takes to add false stull, guarantees to excavate the lateral stability of rear space.Get out of a predicament or an embarrassing situation construction apart from step 5m apart from the time, stop barrel excavation, branch carries out inverted arch, fill concrete construction.
(3) positive hole, intersection inverted arch excavation supporting: positive hole, intersection inverted arch excavation supporting is constructed from big mileage to little mileage direction (big mileage direction is Cheng Chenghuan), excavates 5 Pin steel bow members at every turn, adds false stull behind the excavation, in time seals into ring.
(4) the positive cavity portion lining cutting in intersection: after the positive cavity portion inverted arch in intersection applies and finishes, apply the positive cavity portion lining cutting in intersection immediately, intersection lining cutting segment length 11.2m, chassis can meet the demands.
Construction point:
(1) under the situation of shallow embedding bias voltage, during the construction of horizontal hole, inverted arch at the bottom of the tunnel must be set, with the displacement in the horizontal hole of effective restriction.
(2) less with the positive hole angle of the crossing because of Heng Dong, when carrying out arc base tunnel excavation and mucking out, excavator can't normally rotate, and considers the needs of safety and mechanical work, can be 4~4.5m with the width adjustment of arc base tunnel under situation about satisfying the requirements.
(3) after caunch and finish in the intersection, directly enter the construction of positive hole, should preferentially apply horizontal hole and the barrel lining cutting of the positive hole of intersection section.
(4) to pay much attention to monitoring measurement work in the construction, and reserve enough deflections.
(5) strengthen crossing preliminary bracing quality, especially crossing's i iron door frame, want when measuring unwrapping wire accurately, guarantee that door frame is vertical, must not invade limit.
(6) note the control length of bench, every length of bench should not be greater than 5m; Inverted arch, lining cutting simultaneously in time followed up, and guarantees construction safety.
When (7) face has water, should strengthen the ejectment water of face, avoid invading the bubble basis.

Claims (10)

1. a Support System in Soft Rock Tunnels intersection arc base tunnel job practices is characterized in that: be made up of following steps: (1) Heng Dong hole excavation and supporting; (2) implement to do leading bassoon canopy; (3) horizontal hole barrel excavation and supporting; (4) horizontal hole inverted arch construction and base plate construction; (5) intersection door opening construction; (6) the arc base tunnel formula of directly caunching is excavated and supporting; (7) Zheng Dongshang leads bow member installation and supporting; (8) remove the temporary lining of arc base tunnel; (9) benching tunnelling method is implemented the just wide open supporting of digging; (10) perform horizontal hole barrel lining cutting steel bar concrete; (11) just wide openly dig supporting and add interim inverted arch; (12) perform positive hole inverted arch, and add false stull; (13) perform positive hole, intersection inverted arch; (14)) perform intersection lining cutting steel bar concrete; (15) change positive hole normal construction over to.
2. Support System in Soft Rock Tunnels as claimed in claim 1 intersection arc base tunnel job practices, it is characterized in that: described bassoon canopy directly sets a ring in arch, Heng Dong hole, pipe canopy circumferential distance 0.5m, every 20m is long, and leading the reinforcing implemented in horizontal hole and intersection part.
3. Support System in Soft Rock Tunnels as claimed in claim 1 intersection arc base tunnel job practices, it is characterized in that: benching tunnelling method construction, the supporting of steel bow member are adopted in described horizontal hole; Changeover portion steel bow member adopts fan-shaped layout; This fan-shaped part steel bow member basis adopts C30 steel concrete to enlarge the basis, and arch springing is directly imbedded in the concrete;
In the horizontal cavity portion minor face 3m scope of intersection, preliminary bracing thickness is increased to 35cm, to increase the bearing capacity of intersection part.
4. Support System in Soft Rock Tunnels as claimed in claim 3 intersection arc base tunnel job practices is characterized in that: described whole horizontal hole addition inverted arch, in time seal into ring; When inverted arch excavates, face is carried out linked network, and spray the thick C20 concrete sealing of 10cm.
5. Support System in Soft Rock Tunnels as claimed in claim 1 intersection arc base tunnel job practices, it is characterized in that: describedly at Heng Dong and Zheng Dong intersection section door frame is set, the door frame normal is parallel with positive hole center line, weld type gooseneck on this door frame, and at crossbeam bolts at two ends connecting-type steel post, for positive hole steelframe provides the platform of stopping over;
Described horizontal hole enters positive hole and adopts the arc base tunnel, and the supporting of temporary steel bow member is adopted in the supporting of arc base tunnel, and laterally the temporary steel bow member is arranged on steel bow member top, positive hole, and the control of arc base tunnel excavation face is dug 30cm on the face just wide open, and preliminary bracing is as permanent protection.
6. Support System in Soft Rock Tunnels as claimed in claim 1 intersection arc base tunnel job practices, it is characterized in that: after described arc base tunnel construction is finished, begin the supporting of topping bar of positive hole, positive hole steel bow member is installed, positive hole steel bow member base support is on rock mass or horizontal portal frame crossbeam, and special-shaped bow member length and arc are adjusted accordingly.
7. Support System in Soft Rock Tunnels as claimed in claim 1 intersection arc base tunnel job practices is characterized in that: the temporary lining of described arc base tunnel and positive hole 3.5m scope are topped bar after supporting finishes, and remove the vertical temporary steel bow member of arc base tunnel, change the construction of positive hole over to;
The construction of described positive hole takes benching tunnelling method to reserve the construction of core local method, earlier by arc base tunnel position to little mileage direction construction to horizontal hole minor face, finish the preliminary bracing of topping bar, about stagger and fall step, finish the preliminary bracing of getting out of a predicament or an embarrassing situation; Again to the construction of big mileage direction to horizontal hole long limit, finish the preliminary bracing of topping bar, about stagger and fall step, finish the preliminary bracing of getting out of a predicament or an embarrassing situation;
After the positive cavity portion working space in intersection provides, the horizontal cavity portion lining cutting in the intersection of in time constructing, and guarantee to top bar face apart from being no more than 25m apart from positive hole.
8. Support System in Soft Rock Tunnels as claimed in claim 1 intersection arc base tunnel job practices, it is characterized in that: the just wide open supporting employing benching tunnelling method that digs adds interim inverted arch, the construction of topping bar suspends the construction of topping bar after finishing 25m formation working space, carries out middle bench excavation, supporting, the bow member of topping bar is connected to middle step, in step construction apart from top bar 5m apart from the time, step construction in the time-out, get out of a predicament or an embarrassing situation excavation, supporting, bow member is connected to gets out of a predicament or an embarrassing situation, form the construction of three benching tunnelling methods.
9. Support System in Soft Rock Tunnels as claimed in claim 1 intersection arc base tunnel job practices, it is characterized in that: described positive hole inverted arch excavation supporting takes to add false stull, get out of a predicament or an embarrassing situation construction apart from step 5m apart from the time, stop barrel excavation, branch carries out inverted arch, fill concrete construction;
Positive hole, intersection inverted arch excavation supporting is constructed to little mileage direction from big mileage, excavates 5 Pin steel bow members at every turn, adds false stull behind the excavation, in time seals into ring;
After the positive cavity portion inverted arch in intersection applies and finishes, apply the positive cavity portion lining cutting in intersection immediately.
10. Support System in Soft Rock Tunnels as claimed in claim 1 intersection arc base tunnel job practices is characterized in that: during the construction of described horizontal hole, inverted arch at the bottom of the tunnel is set;
After caunching and finish in the intersection, directly enter the construction of positive hole, should preferentially apply horizontal hole and the barrel lining cutting of the positive hole of intersection section.
CN2013100740266A 2013-03-08 2013-03-08 Weak surrounding rock, tunnel intersection and arc-shaped pilot tunnel construction method CN103195432A (en)

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