CN1847617A - Construction process of pushing in long and large box culvert under taxiway in airport - Google Patents

Abstract

The construction process of pushing in long and large box culvert under taxiway in airport includes top supporting with steel pipes of 325 mm diameter and pushing in box culvert, and features that it also includes digging small guide holes below the box culvert and controlling the subsidence in taxiway. The present invention can ensure the normal taking off, landing and rolling of airplane during construction and has high engineering precision and low cost.

Description

Construction process of pushing in long and large box culvert under taxiway in airport

Technical field

The invention belongs to field of civil engineering, particularly relate to construction technology at underground jacking long and large box culvert.

Background technology

Beijing Capital International Airport west runway is the main runway of international flight landing; the L taxiway that connects western runway and No. four aprons and No. 2 terminal aprons is one of the busiest taxiway in airport; it is many to slide sortie; heavy traffic; it not only bears sliding of aircraft, also is that the slideway that transportation between goods yard, North Area and 1, No. 2 terminal must usual friendship be crossed is transferred in the shipping of South Area, airport CA.Because lorry comes and goes and all will give in to each other with the aircraft that slides, often cause a lot of flights to stop sliding, waiting in line.This situation not only influences normally taking off of flight and causes a large amount of goods to overstock, and brings enormous economic loss to the airport, and what is more important has a strong impact on the flight Normal Take-Off And Landing and slides safety, influences international image.

Present domestic underground construction circle, the pipe canopy of employing are propped up to expand and mostly are ф 159mm pipe, and length only about 60m, is applicable to the pure bored tunnel of little span.If use the above steel pipe of ф 325mm once to squeeze into, length does not have above 100 meters, and low precision." airport news " " airport grade separation acceptance on examination obtains good " that publish in June, 2004, introduced in the grade separation engineering of airport, Xiamen in 2003 jacking seat frame bridge once, but this frame bridge is not worn the aircraft slideway under not being, but wears Fu Shalu under the road of airport, is the part of Fuzhou-Xiamen road training works." transport science and techonologies " 2004 the 4th phases, to have introduced in " Jacking Technique of High-Aperture Pipe Shed Support research " under the lineman's journey of railway suburbs, Guangzhou-Shenzhen railway and worn Shenzhen-Guangzhou superhighway, the pipe shed support greater than 400mm caliber, long 78m has been adopted in the crest enters box culvert construction.Domestic still do not have under the condition of not suspending, and builds up the precedent in tunnel under runway.

Summary of the invention

The technical issues that need to address of the present invention are: a kind of construction process of pushing in long and large box culvert under taxiway in airport is provided, can guarantee that aircraft constructs under the condition of not suspending, ensure the flight Normal Take-Off And Landing and slide safety, prevent to prick head, fine solution butt joint problem, engineering precision height, cost are low.

Technical solution of the present invention is: construction process of pushing in long and large box culvert under taxiway in airport, comprise pre-timbering with tubular prop, crest enters box culvert, it is characterized in that: further comprising in the box culvert bottom and dug little pilot tunnel and road face settlement Control technology, described pre-timbering with tubular prop adopts the supporting of diameter ф 325mm steel pipe.

The present invention compared with prior art has following advantage: 1, little pilot tunnel builds up, at first verify the top and contained front of tunnel heading geology, the pre-supporting of face provides foundation during for jacking, next has reduced in the soil and has seeped water, behind the soil body discharging consolidation, intensity increases substantially, face stability strengthens, the most important thing is to contain the suitable chute surface in the end advances, thoroughly solved a problem of pricking, merging precision is far above code requirement, the discrepancy in elevation＜20mm of the present invention, left-right deviation is within 50mm, and settlement Control does/one three.2, the pre-timbering with tubular prop technology of growing up adopts ф 325mm, L=148m, engineering precision 24cm.3, box culvert jacking in soil, total frictional resistance equals following 5 sums, promptly contains upper and lower, left and right face pressure and takes advantage of scholar's body friction factor to add the frontal drag of sword pin.This engineering is contained the top buried depth and is reached 6m, and the pressure of such 4 faces is just very big, more than 20,000 ton of total top power, more rare at home, box culvert top easily splits, and back also may push up race, the present invention selects a kind of daily output chemical grout for use, it is constant for a long time that its better performances, Main Feature are that viscosity can keep, and meets underground water and do not decompose, in the scholar, do not permeate, drying shrinkage knot is hard, and box culvert is not by locking when resetting more than 3 months stopping to tunnel more than several days total pushing tow time to have guaranteed box culvert.The mud resistance-reducing efficiency reaches 60%-80%, and two joint culverts one are pushed up simultaneously and needed more than 8000 ton top power, are kept to more than 2400 ton, for smooth jacking successfully provides prerequisite.4, the aircraft taxi load reaches 4000kN, much larger than railway or highway load, thereby the security protection requirement is higher, and box culvert shallow embedding (the tunneling buried depth is 2.7m only), the long 142m of top journey, the jacking of not suspending, pavement slab does not have faulting of slab ends, road face sedimentation curvature ≯ 1/3000, sedimentation ≯ 30mm, little to the influence of surface structures facilities such as airport, thoroughly solve freight and cross the L taxiway interference of aircraft Normal Take-Off And Landing and safety problem, increase substantially shipping efficient.5, cost is low, and method is simple, remarkable in economical benefits, and every cavitation rice is 90,000 yuan, and adopts tunneling to be about 120,000 yuan, every cavitation rice is saved 30,000 yuan, saves 4,400,000 yuan altogether.

Specific embodiments

Describe embodiments of the invention below in detail.

Empty side line road engineering, pushing in long and large box culvert under taxiway in airport engineering length is 148m, width is 13.7m, height is 6.45m, is designed to diplopore 6m rectangle box culvert, adopts relay well method jacking construction, the chemical mud pit body lubrication drag reduction of Japan, little pilot tunnel control is pricked head and is come back.

1, the bassoon canopy protects the top pre-supporting technology in advance.

During the box culvert jacking, the front edge pin is subjected to rigidity control and box culvert to prick head to be influenced, can not design oversizely, 2.5m only, and the high 6.5m of soil body face, press lam angle of friction 11 degree angles from containing the end, after calculating the soil body plane of fracture, ten meters thick soil body slump districts will be arranged at box culvert front end face and top, the pipe shed support that present domestic underground construction circle adopts mostly is ф 159mm pipe, and length only is about 60m, is applicable to the pure bored tunnel of little span, the long 148m of this engineering, the disposable ф 325mm pipe canopy beyond example still at home of getting through.

The present invention adopts wireless signal remote control to survey and receives and the emission instrument, record three-dimensional coordinate and the attitude angle of drill bit in soil of Directing Station, make the guiding sole at drill bit place to theory orientation deflection by rotation, thereafter give the drilling rod applied thrust, make it to advance, thereby finish the pilot hole of long 148m along the correction of guide strip bevel direction.

After utilizing the interior drill rod end of pilot hole to install the enlarged footing of band jetting cutting soil additional, pilot hole is extended to about 350mm, with the mud cover hole wall is protected simultaneously.After finishing reaming, draw with drilling rod, with ф 325mm diameter, the steel pipe of thick 10mm, after progressively weldering connected, being used as power with large-scale hauling pipe rig was dragged to the other end with steel pipe from Kong Yiduan.Afterwards measurement and positioning errorless after, in pipe, pump into the C25 concrete, form the beam on the elastic foundation in the soil, canopy is firmly contained the front end certain limit top soil body, effectively prevents landslide.

2, little pilot tunnel and glide path technology

Bundle in a box culvert jack-in process phenomenon is difficult to avoid, and domestic engineering circle is headache for this reason always, and so big box culvert on weak soil, is certain to prick head again, can't solve the butt joint problem in case prick head.The present invention adopts containing the end and digs a little pilot tunnel, and for the making slideway provides the space, little pilot tunnel is of a size of wide 1.3m * high 1.9m, periphery with linked network spray 10cm, thick C20 concrete is a supporting and protection structure, by a Pin bow member, to be that ф 50mm steel pipe is curved be welded into bow member every 0.5m.

At the bottom of little pilot tunnel, lay 3 I20 i iron, by the gradient mix up, leveling, fixing with the support welding, the slideway of pumping C20 concrete pouring bar shaped thereafter, size 1.0m is wide * 0.6m is thick, the i iron end face flushes with the concrete end face, thereby slideway formation.In the box culvert jack-in process, little pilot tunnel supporting and protection structure is abolished with excavator.

3, chemical slurry lubrication technology

Box culvert is jacking in soil, and total frictional resistance equals following 5 sums, promptly contains upper and lower, left and right face pressure and takes advantage of soil body friction factor to add the frontal drag of sword pin.Use daily output chemical grout better performances, it is constant for a long time that Main Feature is that viscosity can keep, and chance underground water does not decompose, in soil, do not permeate, drying shrinkage knot is hard, guarantee box culvert stop to tunnel more than several days, total pushing tow time, box culvert was not by locking when resetting more than 3 months.

Stirring pumping is pressed by mud lubrication of the present invention system, and pumping pressure 0.15-0.4Mpa, pipeline are by house steward, branch diameter ф 40mm, and the slip casting one way valve is formed.

By spacing 3m, case end distance 1.5m place's cloth pipeline and one way valve connect long ф 40 high-pressure rubber pipes of one section 5m at each relay well place of casing around the box culvert appearance, and branch road starting point end mounting ball valve is with flexible control slip casting position and grouting amount.

4, road face settlement Control technology

The road face is arranged net, and monitors sedimentation with precision level, monitors the tense sedimentation at each control point.The T-S curve is associated to putting distance L with containing end, draws T-S-L figure, to find out the position that needs slip casting, the contingent sedimentation value in prediction the place ahead.

The Comprehensive Control measure mainly contains in the hole: 1) native jacking, 2 are eaten in strictness) guarantee the two-edged pin side plate outside sky that do not collapse, 3) guarantee that face does not reveal the pipe canopy, reveals the landslip of sword pin, 4) contain the front end base plate and can not backbreak 5) slip casting pressure regulation and pressurize.

Pipe canopy stress, strain measurement, the anti-pipe canopy amount of deflection of asking.

Contain back of the body soil pressure measurement.

Local ground grouting and reinforcing anti-settling outside the road face.

5, tunneling of two-way jacking closure segment and joint treatment technology

A two-way position that closes up is chosen in beyond the taxiway, beyond the sliding limit vertical distance 10m of L, reduces like this slideway settlement influence, and is stressed also safer.

Sword pin spacing 3-5m is advisable, and mainly considers the influence of an end pushing tow to the other end, and when connecting soon, the other end face soil body can cave in, and is dangerous.

Sword pin steel plate is not dismantled, and still plays the effect of retaining soil.The vertical distribution reinforcement ф 16 of box culvert, ф 20 adopt boring bar planting technology to connect.Box culvert hoop steel bar stress, because its broken end will cut length 10d in oblique triangle sword pin concrete, about 30cm scope adopts overlap welding to connect.Waterproofing course will be attached to sword pin steel plate inboard, two ends, carries out and hands over circle, will glue the square chance freight of 50 * 50mm account sealing rod at culvert plate end face.

Principal rod colligation order: outer earlier, internal layer again, back envelope template.

Locate to irritate concrete from low to high, press lift-up method to build concrete with the bottom-up band of concrete pump line.Establish exhaust, plasma discharge mouth at highest point.

Select large fluidity for use, high-strength self-compacting concrete.Irritate when concrete seals arch at last and want slow, pump once stops, treats that air water arranged, and the concrete of emerging is starched to filling.Pre-buried madjack pipe, back ftercompction cement paste.

6, box culvert relay well and joint waterproofing

The every joint of the present invention is contained long 15m, and the place has established relay well and risen nest at every joint seam, and first joint must be established relay well, and other can establish one group of relay well by 2 joints, and to reduce seam, the culvert joint is long also to be adjustable to about 20m.

The internode waterproof: adopt the diameter at internode extruding ф 80mm, thick 1.5cm rubber tube is aided with joint filling cream grouting for water blocking later on again.

Claims (6)

1, construction process of pushing in long and large box culvert under taxiway in airport comprises pre-timbering with tubular prop, crest enters box culvert, it is characterized in that: further comprising in the box culvert bottom to have dug little pilot tunnel and road face settlement Control technology, and described pre-timbering with tubular prop adopts the supporting of diameter ф 325mm steel pipe.

2, construction process of pushing in long and large box culvert under taxiway in airport according to claim 1, it is characterized in that: at the bottom of little pilot tunnel, lay 3 No. 120 i iron, by the gradient mix up, leveling, fixing with the support welding, thereafter pumping C20 concrete pouring bar shaped slideway, the i iron end face flushes with the concrete end face.

3, construction process of pushing in long and large box culvert under taxiway in airport according to claim 1 and 2 it is characterized in that: further comprising mud and falls the resistance technology, adopts the daily output chemical grout.

4, construction process of pushing in long and large box culvert under taxiway in airport according to claim 3 is characterized in that: described road face settlement Control technology comprises:

The road face is arranged net, and monitors sedimentation with precision level, and the T-S curve is associated to putting distance L with containing end, draws T-S-L figure, finds out the position that needs slip casting, the contingent sedimentation value in prediction the place ahead;

The Comprehensive Control measure mainly contains in the hole: native jacking is eaten in strictness; Guarantee the two-edged pin side plate outside sky that do not collapse; Guarantee area and do not reveal the landslip of managing canopy, revealing the sword pin; Containing the front end base plate does not backbreak; Slip casting pressure regulation and pressurize;

Pipe canopy stress, strain measurement, the anti-pipe canopy amount of deflection of asking;

Contain back of the body soil pressure measurement;

Local ground grouting and reinforcing anti-settling outside the road face.

5, construction process of pushing in long and large box culvert under taxiway in airport according to claim 1 it is characterized in that: further comprising tunneling of two-way jacking closure segment and joint treatment technology:

A two-way position that closes up is chosen in beyond the taxiway, beyond the sliding limit vertical distance 10m of L;

Sword pin spacing 3-5m;

Sword pin steel plate is not dismantled, and the vertical distribution reinforcement ф 16 of box culvert, ф 20 adopt boring bar planting technology to connect, and box culvert hoop steel bar stress cuts length 10d, and about 30cm scope adopts overlap welding to connect;

Waterproofing course will be attached to sword pin steel plate inboard, two ends, carries out and hands over circle, will glue the square chance freight of 50 * 50mm account sealing rod at culvert plate end face;

Principal rod colligation order: outer earlier, internal layer again, back envelope template;

Locate to irritate concrete from low to high, press lift-up method to build concrete, establish exhaust, plasma discharge mouth at highest point with the bottom-up band of concrete pump line.

6, construction process of pushing in long and large box culvert under taxiway in airport according to claim 1 it is characterized in that: further comprising box culvert relay well and joint waterproofing:

Every joint is contained long 15m, and the place has established relay well and risen nest at every joint seam, and first joint must be established relay well, and other can establish one group of relay well by 2 joints, and the box culvert joint is long also to be adjustable to about 20m;

The internode waterproof: adopt the diameter at internode extruding ф 80mm, thick 1.5cm rubber tube is aided with joint filling cream grouting for water blocking later on again.