CN101225742A - Construction method of shallow buried underground excavating tunnel super large section using PBA method - Google Patents

Construction method of shallow buried underground excavating tunnel super large section using PBA method Download PDF

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Publication number
CN101225742A
CN101225742A CNA2007100599130A CN200710059913A CN101225742A CN 101225742 A CN101225742 A CN 101225742A CN A2007100599130 A CNA2007100599130 A CN A2007100599130A CN 200710059913 A CN200710059913 A CN 200710059913A CN 101225742 A CN101225742 A CN 101225742A
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tunnel
construction
arch
pba
excavation
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CNA2007100599130A
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CN100464055C (en
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童顺军
黄广锴
安建平
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中铁十八局集团有限公司
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Abstract

The invention relates to a method of shallow embedment and concealed excavation based on the PBA method for construction on super large cross-section of tunnel, comprising the following steps: 1. to detect the geologic cavity over the wide span tunnel structure; 2. to arrange the ground dewatering well and the tunnel horizontal well; 3. to take the horizontal channels of vertical well as the front large pipe shed on the arch part of the main body and to inject for strengthening the terrain formation; 4. to carry out the supporting arch construction on the side span of small pilot tunnel and the supporting major arch construction on the main body; 5. to excavate the soil mass of lower cross section as the extended foundation and the central partition wall; 6. to remove the bottom central partition wall section by section, construct bottom underlayer and waterproof layer, pour the reinforced concrete; 7. to remove the central partition wall of the upper part section by section and temporary steel shotcrete in the small pilot tunnel, construct the waterproof layer and concrete of the side wall and the main arch. The method of shallow embedment and concealed excavation based on the PBA method for construction on super large cross-section of tunnel has the advantages of guaranteeing the safety, quality and time limit of the construction, saving cost and enhancing work efficiency.

Description

Utilize the PBA method to carry out the job practices of shallow buried covered excavation tunnel large section

Technical field:

The invention belongs to a kind of construction techniques, the particularly a kind of PBA of utilization method is carried out the job practices of shallow buried covered excavation tunnel large section.

Background technology:

Present domestic construction technology level of striding the tunnel greatly, the job practices that is fit to select for use mainly contains cut and cover method and shallow burial hidden digging.Wherein shallow burial hidden digging comprises the double side wall pilot tunnel method again and is striding " PBA " method that adopted the subway station greatly.But, these methods for the surrounding enviroment complexity, underground utilities are intensive, geological conditions is poor, rich groundwater, and the big construction environment of section span all exists different defectives and limitation.

1, the operating mode that cut and cover method is various for traffic above-ground, underground utilities are various must be carried out pipeline and be changed to move with traffic and discongest during construction, the suffered interference of therefore constructing is big, long in time limit; In addition, carry out pipeline change temporarily move and sapce charge with high, less economical.

2, the shallow buried covered excavation double side wall pilot tunnel method of Cai Yonging,, surrounding enviroment complexity poor, relate to and influence the various construction environment of underground utilities for the tunnel geology condition, totally unfavorable to superstructure pipeline and surrounding enviroment security control, construction risk is big, analyzes theoretically to be difficult to guarantee safety.

And the PBA method is because its scope of application is wider, be applicable to stratum, the tunnel excavation that geological conditions is very poor, span is big, surface settlement is strict, and can reduce surface settlement, to remove the temporary lining workload less relatively, simplified construction technology, work efficiency is higher, thereby be applied in the construction of striding the subway station greatly, still also be not applied in the construction of longspan tunnel.

Summary of the invention:

Purpose of the present invention just is to overcome above-mentioned the deficiencies in the prior art, and provide a kind of PBA of utilization method to carry out the job practices of shallow buried covered excavation tunnel large section, this job practices can guarantee construction safety, quality and duration, but and cost saving, improves work efficiency.

Technical scheme of the present invention is: a kind of PBA of utilization method is carried out the job practices of shallow buried covered excavation tunnel large section, it is characterized in that: carry out according to the following step:

(1) detects for cavity, longspan tunnel superstructure stratum;

(2) arrange horizontal well in surface precipitation well and the hole;

(3) utilize vertical shaft transverse passage-way (pipe canopy operating room) to apply the leading bassoon canopy in main body arch, and pre-grouting and reinforcing stratum;

(4) little pilot tunnel of construction and pre-buried connecting reinforcement;

(5) set up little pilot tunnel grid bow member, and be connected with pre-buried connecting reinforcement;

(6) to just propping up concrete perfusion fill concrete behind in the pilot tunnel;

(7) excavation left and right side arch is set up the main arch grid, and is connected with pre-buried connecting reinforcement;

(8) pilot tunnel under pilot tunnel and the right side applies mid-board and bottom to support temporarily under on the left of the excavation;

(9) the section soil body applies expansion basis and median septum under the excavation;

(10) bottom median septum is removed in segmentation, and construction bottom cushion, waterproofing course are built steel concrete;

(11) segmentation remove temporary steel support in top median septum and the little pilot tunnel, apply abutment wall and main arch waterproofing course, concrete.

Above-mentioned bassoon canopy apply the method that adopts the seamless steel pipe segmentation to set, longitudinal lap joint between every section.

The construction of above-mentioned bassoon canopy adopts the boring static pressure to head into method construction, equipment choosing HXY-500M geological drilling rig.

The detection in cavity, above-mentioned longspan tunnel superstructure stratum adopts ground penetrating radar to detect the GPR technology.

Above-mentioned little pilot tunnel grid adopts overlap welding to be connected with embedded bar, and the main arch grid adopts overlap welding to be connected with connecting reinforcement, makes it to connect into integral body with little pilot tunnel grid.

The present invention has following advantage and good effect:

(1) broken through in the past " PBA " method and only limited to and be used for multispan multilayer underground station and parking lot shallow buried and underground excavated engineering project project, " PBA " method that solved is applied to an integrated technology difficult problem in the shallow buried covered excavation single span large section tunnel.

(2) adopt ground penetrating radar to detect the detection in cavity, stratum, the section of striding tunnel structure top greatly of (GPR) technology, it is poor to have solved at formation condition, and the surrounding enviroment complexity is constructed and disturbed under the big situation, carry out how carrying out the difficult problem that the cavity, stratum is detected before shallow buried covered excavation strides constructing tunnel greatly;

(3) adopt the treatment measures of horizontal well precipitation in well point+hole, ground, " PBA " method that solved is effectively striden the difficult problem of tunnel shallow buried covered excavation groundwater treatment when constructing greatly at water enrichment area.

(4) adopt the boring static pressure to head into, and set up pipe canopy operating room way at the agent structure middle part, it is limited to have solved construction operation space, and upper pipeline is intensive, under the high situation of pipe roof construction precision, settlement request, and the technical difficult problem that the pipe canopy of growing up applies;

(5) after the grid steelframe connects job practices, solved that to stride tunnel " PBA " worker's method button arch working security greatly poor, twice button arch connects the not high technical difficult problem of precision;

(6) select rational temporary lining dismounting, support replacement method and two lining concrete support systems for use, guaranteed to stride greatly the safety of structure in the tunnel double-lining construction temporary lining demolishing process, guaranteed the construction quality of large section concrete structure.

Description of drawings:

Fig. 1 is construction process figure of the present invention.

Fig. 2 is a precipitation well construction process chart.

Fig. 3 is that bassoon canopy in main body arch is provided with schematic diagram.

Fig. 4 is a pipe canopy section construction floor map.

Fig. 5 is the pipe roof construction flow chart.

Fig. 6 is a button arch construction schematic diagram.Wherein, Fig. 6-the 1st, construct little pilot tunnel and pre-buried connecting reinforcement schematic diagram; Button arch schematic diagram in Fig. 6-the 2nd, little pilot tunnel; Fig. 6-the 3rd, backfill pilot tunnel inner concrete schematic diagram; Fig. 6-the 4th, arch grid schematic diagram is also set up in excavation arch (No. 1 pilot tunnel), left side; Arch grid schematic diagram is also set up in Fig. 6-5 excavation arch, right side (No. 2 pilot tunnels); Fig. 6-the 6th, the excavation left side is pilot tunnel (No. 3 pilot tunnels) down, applies the bottom and supports schematic diagram temporarily; Fig. 6-the 7th, excavation arch, right side (No. 4 pilot tunnels) applies the bottom and supports schematic diagram temporarily.

The specific embodiment:

The yellow interval large section tunnel of reviving is four, No. ten line interconnection sidings of Beijing Metro section, is that single hole is three-way by the transition of single hole two-wire, and vault stalk type section is adopted in design.Simultaneously the section of striding tunnel is divided into the section of three kinds of different sizes again according to line alignment greatly: section E, mileage K2+240.3~K2+262.5, long 22.2m, span 15.076m, highly 9.3m; Section E ', mileage K2+262.5~K2+282.3, long 19.8m, span 15.937m, high 9.855m; Section F, mileage K2+282.3~K2+296.3, long 14.0m, span 17.5m, height 10.5m.Its job practices is carried out according to the following step: (as shown in Figure 1)

1, detect for cavity, longspan tunnel superstructure stratum:

This detection operations has adopted the advanced at present high-resolution U.S. to produce SIR-2 type ground penetrating radar detection system both at home and abroad.This ground penetrating radar configuration center frequency 100MHz antenna, the reliable detection degree of depth can satisfy this engineering demand about 6m.

Get along agent structure center, tunnel and tunnel external structure line outside 5m direction and arrange 3 surveys line, receive and carry out the data processing by the get off situation of back wave of instrument record according to reception antenna.

2, arrange horizontal well in surface precipitation well and the hole:

Survey data show the influence that the yellow interval section of striding greatly of Soviet Union is dived under water by tableland diving, interlayer mainly in the cutting depth scope according to geology is detailed.Tableland diving mainly is distributed in the scope of structure roof top 0.8~3.60m, and the top board top covers thicker farinose argillic horizon, the silty clay of Fu Shui is very easily liquefaction after the construction disturbance, become stream mud shape, tunnel excavation process kind is prone to caves in, falls the piece phenomenon, tunnel excavation disturbance and underflow are turned pale and are easily aggravated ground settlement in addition, have increased construction risk.According to " PBA " worker method characteristics, and, adopted the treatment measures of horizontal well precipitation in well point+hole, ground in the construction, guaranteed the safety of work progress in conjunction with the hydrology, geological condition.

(1) arranges the surface precipitation well.The precipitation well is arranged along the both sides, tunnel along line direction, spacing 6~8m, and cloth precipitation well is 20 altogether, adopts φ 400/50mm not have the sand cement pipe, and well casing twines 80 order nylon gauzes, and pipe is outer fills out φ 20~40mm filtrate to below ground 1.5m place.Anti-circulation and Churn drill rig pore-forming are adopted in construction, aperture 600mm, and the employing high-lift submersible pump is taken out, draining.As shown in Figure 2:

Concrete work progress is as follows:

A, the location of well

According to precipitation well location map, underground utilities distribution map and coordinate control point dispensing precipitation well well location.For guaranteeing safety, answer physical prospecting to verify the well location place after the location of well and have or not underground utilities, underground obstacle in conjunction with artificial luoyang spade.

B, artificial inspecting hole

Borehole diameter 1000mm whenever digs into 800mm, does retaining wall one time, and template supports between two parties, boxes out seam all around evenly, guarantees 10cm thickness.Every upper and lower two-layer retaining wall must overlap 50mm-100mm.Suspicious atural object to running in the borehole mustn't directly destroy, and can continue construction after site administrator's approval.

C, digging pit assembles mud pit

For guaranteeing the drilling process water circulation and preserving boring and slag tap, enclose mud pit with aerated blocks at the scene, and in mud pit, lay Polypropylence Sheet, prevent that slurries from exposing, outsidely support with soil, after construction finishes with last residue except that clearing out a gathering place.

D, in place, the adjustment of rig

Need adjust the planeness of rig and the verticality of boring tower when rig is in place, real after the contraposition with the board headblock, guarantee that rig lays steadily.

E, boring

Should guarantee that in boring procedure the mud liquid level protects on the bucket at steel in the hole.Under the situation that formation condition allows, use the stratum from making the mud pore-forming as far as possible, if boring by the hole of easily collapsing drifting sand layer or during the serious stratum of lose returns, can adopt artificial pulping retaining wall to creep into, mud balance transfers to 1.1~1.3.

F, following pipe

Whether on request following Guan Qianying checks well casing looping nylon wire; No sand cement interface tube place will use Polypropylence Sheet Bao Yan, will guarantee verticality and weld tight when hypomere welds on the steel pipe.Well casing must be guaranteed in wellhole placed in the middle.

G, fill out filtrate

Filler must evenly slowly be inserted around well, avoids causing arch formation in the hole, if finding filtrate sinks should in time replenish filtrate, packed height is filled to underground 3m by designing requirement behind the well-flushing.

H, well-flushing

Adopt the pressure fan well-flushing, if sinking should be injected clear water when not enough in the well.

(2) arrange horizontal well in the hole.

From vertical shaft transverse passage-way excavation situation in early stage, arch and face water percolating capacity are bigger.Particularly the arch, tunnel is arranged in argillic horizon, and the ground deep-well precipitation can not form the precipitation funnel, forms stream mud in the digging process easily, causes that a large amount of peripheral soil layers run off, and cause face of land excess to sink easily.Through after the earnest analytical study, decision utilized vertical shaft transverse passage-way space before the section of striding constructing tunnel greatly, set up horizontal well to striding the tunnel direction greatly, and local backwater is shifted to an earlier date drainage, played the effect of leading precipitation during excavation.

Horizontal well is provided with 6 altogether, 30~40 meters of length.HXY-500M geological drilling rig pore-forming is adopted in construction, and the aperture is 108mm, lays φ 50mm spray of molten steel pipe then in the hole, and spray of molten steel pipe is outside and swathe two-layer 80 mesh filter screens, sees Fig. 7-2-4 for details.

Concrete work progress is:

Dispensing well location → rig is in place → and the pipe → sealing of hole → diversion of rig leveling, contraposition → spiral pore-forming → down is outside vertical shaft → draining goes out vertical shaft.

3, utilize the vertical shaft transverse passage-way to apply the leading bassoon canopy in main body arch, and pre-grouting and reinforcing stratum.

Φ 159 is adopted in the leading bassoon canopy design in the Soviet Union yellow interval three-way section of striding greatly arch, t=10.0mm, and the seamless steel pipe 1 of l=56.0m, spacing is 0.4m, carries out slip casting after pipe roof construction finishes, injecting paste material adopts cement paste.As shown in Figure 3.

Because disposable the setting of 56m long tube canopy is unfavorable for the control of pipe roof construction precision, the superstructure pipeline is various in addition, also is difficult to guarantee the superstructure pipeline safety.Comprehensive each side factor, we determine to adopt the scheme that the segmentation of 56m long tube canopy is set, and longitudinal lap joint length is 3m between the pipe canopy.

At first utilize the vertical shaft transverse passage-way as first section Guan Peng operating space, it is 25m that the pipe canopy sets length; When little pilot drive is to the K2+279.3 place in both sides then, little pilot tunnel of left line and the little pilot tunnel of right line are communicated with, be arranged to manage the canopy operating room, second section and the 3rd section pipe canopy utilize the operating room space to apply and each 20 meters long bassoon canopies to little mileage (E ' section) and big mileage (F section) direction respectively, as shown in Figure 4.

The construction technology employing of pipe canopy is subjected to the operating space to influence the less boring static pressure method of heading into and constructs equipment choosing HXY-500M geological drilling rig.Construction technology as shown in Figure 5.

4, detain the arch construction, and finish according to following operation; As shown in Figure 6.

1. the little pilot tunnel of constructing is pre-buried connecting reinforcement 2 also; 2. set up grid 3 in the little pilot tunnel; 3. to a concrete perfusion backfill 4 behind just in the pilot tunnel; 4. excavate arch (No. 1 pilot tunnel), left side and set up arch grid 5; 5. excavate arch, right side (No. 2 pilot tunnels) and set up arch grid 6; 6, pilot tunnel (No. 3 pilot tunnels) under the excavation left side applies the interim support 7 in bottom; 7, excavation arch, right side (No. 4 pilot tunnels) applies the interim support 8 in bottom.Above-mentioned little pilot tunnel grid adopts overlap welding to be connected with embedded bar, when main body is excavated, adopts overlap welding to be connected main arch grid and connecting reinforcement, makes it to connect into integral body with little pilot tunnel grid

5, the section soil body applies expansion basis and median septum under the excavation;

6, bottom median septum is removed in segmentation, and construction bottom cushion, waterproofing course are built steel concrete;

7, segmentation remove temporary steel support in top median septum and the little pilot tunnel, apply abutment wall and main arch waterproofing course, concrete.

Claims (5)

1. job practices of utilizing the PBA method to carry out shallow buried covered excavation tunnel large section is characterized in that: carry out according to the following step:
(1) detects for cavity, longspan tunnel superstructure stratum;
(2) arrange horizontal well in surface precipitation well and the hole;
(3) utilize the vertical shaft transverse passage-way, promptly manage the canopy operating room, apply the leading bassoon canopy in main body arch, and pre-grouting and reinforcing stratum;
(4) little pilot tunnel of construction and pre-buried connecting reinforcement;
(5) set up little pilot tunnel grid bow member, and be connected with pre-buried connecting reinforcement;
(6) to just propping up concrete perfusion fill concrete behind in the pilot tunnel;
(7) excavation left and right side arch is set up the main arch grid, and is connected with pre-buried connecting reinforcement;
(8) pilot tunnel under pilot tunnel and the right side applies mid-board and bottom to support temporarily under on the left of the excavation;
(9) the section soil body applies expansion basis and median septum under the excavation;
(10) bottom median septum is removed in segmentation, and construction bottom cushion, waterproofing course are built steel concrete;
(11) segmentation remove temporary steel support in top median septum and the little pilot tunnel, apply abutment wall and main arch waterproofing course, concrete.
2. the PBA of utilization method according to claim 1 is carried out the job practices of shallow buried covered excavation tunnel large section, it is characterized in that: above-mentioned bassoon canopy apply the method that adopts the seamless steel pipe segmentation to set, longitudinal lap joint between every section.
3. the PBA of utilization method according to claim 1 is carried out the job practices of shallow buried covered excavation tunnel large section, it is characterized in that: the construction of above-mentioned bassoon canopy adopts the boring static pressure to head into method construction, equipment choosing HXY-500M geological drilling rig.
4. the PBA of utilization method according to claim 1 is carried out the job practices of shallow buried covered excavation tunnel large section, it is characterized in that: the detection in cavity, above-mentioned longspan tunnel superstructure stratum adopts ground penetrating radar to detect the GPR technology.
5. the PBA of utilization method according to claim 1 is carried out the job practices of shallow buried covered excavation tunnel large section, it is characterized in that: above-mentioned little pilot tunnel grid adopts overlap welding to be connected with embedded bar, the main arch grid adopts overlap welding to be connected with connecting reinforcement, makes it to connect into integral body with little pilot tunnel grid.
CNB2007100599130A 2007-10-17 2007-10-17 Construction method of shallow buried underground excavating tunnel super large section using PBA method CN100464055C (en)

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