CN106907161B - A kind of tunnel slope caunches special construction method - Google Patents

A kind of tunnel slope caunches special construction method Download PDF

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Publication number
CN106907161B
CN106907161B CN201710297255.2A CN201710297255A CN106907161B CN 106907161 B CN106907161 B CN 106907161B CN 201710297255 A CN201710297255 A CN 201710297255A CN 106907161 B CN106907161 B CN 106907161B
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tunnel
main tunnel
shaft
main
arch
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CN106907161A (en
Inventor
叶宇
余卫华
白明禄
方佳
刘永阔
常岩
李经纬
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China Railway 21st Bureau Group Co., Ltd.
China Railway Group Co., Ltd.
No.5 Engineering Corporation Limited of CR22G
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CHINA RAILWAY 22ND CONSTRUCTION BUREAU Co Ltd
No5 Engineering Corp Ltd Of Cr22g
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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
    • E21D11/102Removable shuttering; Bearing or supporting devices 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
    • E21D11/04Lining 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
    • E21D11/105Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
    • 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
    • E21D11/107Reinforcing elements therefor; Holders for the reinforcing elements
    • 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 belongs to technical field of tunnel construction, a kind of tunnel slope is disclosed to caunch special construction method, it will intersect into main tunnel section and resolve into small cavities, then respectively to two sides excavation section by section, using service gallery composite lining structure as basic point, main tunnel preliminary bracing structure in small cavities is supported, stable three-legged structure is formed, small cavities are rapidly completed to two sides main tunnel and implement the construction conversion that benching tunnelling method excavates;Inclined shaft proximity main tunnel intersects fare register, in intersection interface, enter main tunnel tunnel cutting using small base tunnel is excavated, it attentions branch steelframe at the beginning of hole in pilot tunnel internal frame, and erect and a little act on 5 Pin of the inclined shaft splicing top Men Liang, implement to be bolted, completes the firm system of early stage closed loop support, then excavate by three step normal direction two sides into main tunnel standard section, construct base tunnel when need to reserve the main tunnel just Zhi Houdu and reserved 40cm deformation amount of sinking.The present invention can minimize the security risk during main tunnel ripping construction, and time effects are reduced to most short.

Description

A kind of tunnel slope caunches special construction method
Technical field
It caunches special construction method the invention belongs to technical field of tunnel construction more particularly to a kind of tunnel slope.
Background technique
In constructing tunnel field, inclined shaft is mature into main tunnel construction technology, mostly with " inclined shaft extends and tunnels a distance in parallel To main tunnel working face, then dig paragraph by paragraph, supporting immediately forms main tunnel preliminary bracing structure " or " oblique way is close to main tunnel phase Mileage 10m paragraph is handed over, inclined shaft vault elevation is gradually raised and is applied at the intersection after incline sinking to main tunnel excavation contour line Reinforcing ring enters main hole using hangar tunnel and is excavated, main tunnel steelframe is stopped in reinforcing ring in hangar tunnel in inclined shaft and main tunnel intersection At upper and opposite side main tunnel top bar arch springing " engineering method carry out, apply in other similar Tunnel Engineering than wide at home.
When first method turns around to remove extension lower curved section steelframe supporting in Large-span loess tunnels application due to it, easily Cause country rock sedimentation and deformation, or even landslide that inclined shaft is caused to fail into main tunnel, is not easy to be controlled surrouding rock deformation from technical standpoint.
Second method applies the theory of hangar tunnel though using climbing and caunching, it is used at inclined shaft proximity main tunnel Raise inclined shaft vault elevation and infall setting reinforcing ring way there are larger drawbacks, first is that, inclined shaft rise-span ratio increase, (must encrypt steelframe, Enhanced support measure) stringent to preliminary bracing structural requirement, lining cutting easily forms large area arch after applying back Portion comes to nothing phenomenon, unfavorable to control settlement deformation;Second is that the reinforcing ring and inclined shaft liner structure of inclined shaft and main tunnel intersection Linking (or bottomed) rigidity and stability and insufficient, stress condition is uneven, may cause the drawing crack of main tunnel prop.Three It is that hangar tunnel (or pilot tunnel) is in Large-span loess tunnels construction, and structure stress anisotropy is complicated and changeable, and hangar tunnel stress condition is most Greatly, hangar tunnel steelframe spacing is arranged, and advance support, lock foot measure etc. answer emphasis to consider.
To ensure to wear village section under the 2# inclined shaft shallow embedding of the village Shang Ge tunnel, inclined shaft into main tunnel construction safety, reduce tunnel with just Hole transposition section collapsing risk responds headquarter comprehensively and " gives top priority to what is the most important, makes overall plans, scientific arrangement, balanced construction, abiding by The principle of regulations, continuous tissue ", to quickly complete inclined shaft, main tunnel transposition section support system closure, especially to 2# inclined shaft into main tunnel Arrangement and method for construction is studied: advance support, strengthening supporting, the monitoring and measuring technology of analogy under-traverse tunnel carry out supplement optimization and set Meter, gate frame technique complementary of the analogy across both wired bridge structures intersection section main tunnel steelframe are stopped over door type beam design.It examines Worry loess tunnel self structure is unstable, and self-stability is poor, the fast feature of stresses re-distribution, designs small pilot drive headroom profile and expands Big 40cm considers.
Summary of the invention
For domestic similar tunnel problem of the existing technology, caunch special project the present invention provides a kind of tunnel slope Construction method.
The present invention is implemented as follows:
92 ° of inclined shaft and the main tunnel plane angle of cut, in inclined shaft close to fare register is intersected with main tunnel, main tunnel intersects mileage with inclined shaft It rises, main tunnel tunnel cutting is entered using small base tunnel;
It attentions branch steelframe at the beginning of hole in pilot tunnel internal frame, excavates by three step normal direction two sides into main tunnel standard section, constructing pilot tunnel When need to reserve main tunnel just Zhi Houdu and the prearrangement of deformation amount amount of sinking.
Further, the tunnel slope caunch special construction method specifically includes the following steps:
(1) inclined shaft is designed as V grade of moulded lining Support types of loess tunnel into main tunnel intersection section original.Consider inclined shaft into The construction of main tunnel Special zone, surrouding rock stress condition, reinforce inclined shaft supporting parameter, and increase deformation allowance to 15cm, It is 20m (inclined shaft strengthening segment schematic diagram See Figure 3) that segment length is reinforced in inclined shaft lining cutting.Resistance to compression lining cutting section supporting parameter: arch wall erects I20a profile steel frame, spacing 0.6m amount to 33 Pin, and bent wall band inverted arch resistance to compression lining cutting uses C40 concrete, and structure reinforcing bars are using double Layer HRB400 Ф 20mm reinforcing bar, main reinforcement spacing 20cm, net protective layer thickness 5cm;Inverted arch use C40 concrete, most thick 115cm, Reinforcing bar uses HRB400 Ф 20mm reinforcing bar, and main reinforcement spacing 20cm, net protective layer thickness 5cm, distributing reinforcement is using 14 steel of HRB400 Ф Muscle, spacing 25cm hook muscle and use 8 reinforcing bar of HPB300 Φ, indulge circumferential direction spacing 20cm × 25cm;
(2) in main tunnel leftwall and inclined shaft intersection, using erecting five Pin I25a profile steel frames side by side, and at the top of arch Door beam is set to support main tunnel top arch, door beam uses 5 Pin I25a I-steel weldings, and Men Liang rides upon inclined shaft arch;
(3) connection of door beam, which is all made of, is bolted, in the construction process, it is necessary to install, guarantee according to design drawing position Column, crossbeam position are accurate.UsingFoot anchor tube is locked, secured with column and beam welding respectively, anchor tube length is 5.0m, For reinforced door beam integral stability, concrete continuous footing is arranged in door beam column footing, and cross sectional dimensions 1.87m × 0.6m is long 1.0m, I-shaped steel feet welding steel size 50cm (width) × 75cm (length) × 16mm (thickness) are used with strip footing pre-embedded steel slab The connection of M27 × 70mm high-strength bolt (note: strip footing pre-embedded steel slab having a size of 50cm (width) × 75cm (length) × 16mm (thickness), Steel plate welds 22 dowel of Ф, joint length 65cm).
For reinforced door beam entirety stability under loading, lateral connection, welding beam and slope invert is arranged in door joist steel arch bottom First branch steelframe design is consistent, is placed between two Pin steelframe of slope invert, and gunite concrete forms entirety;
(4) climbing is caunched slope mouth lining cutting is performed after carry out main tunnel ripping construction again, while according to main track tunnel with just Hole vault height difference is big, and pilot tunnel excavates for the first time fills ramp climbing ratio of slope 33%, after pilot drive drilling depth 3m, carries out second The rammer stone that bankets fills ramp, and ratio of slope 21% of climbing is climbed 19.5 meters of section;
(5) integrating tunnel stress condition erects the parallel main tunnel middle line of a Pin at interval of 60cm within the scope of tunnel arch Gate temporary support erects the gate temporary support of the parallel main tunnel middle line of a Pin within the scope of tunnel haunch at interval of 80cm, on Portion's height is more than the main tunnel outer 40cm, that is, anticipated settlement 40cm of design excavation contour line, and it is list that 22 Pin, which are arranged, in gate support altogether Solely design;
(6) lower curved section excavate and just branch after the completion of, into main tunnel work of caunching start before, in the intersection of inclined shaft and main tunnel Place applies 10m secondary lining;Inclined shaft lining cutting uses formwork jumbo lining cutting, and concrete is mixed and stirred using automatic gauge blending station, pumps Concrete construction process;
(7) pilot tunnel construction is carried out;Perpendicular to main tunnel middle line hand excavation's clear span 2.5m pilot tunnel, at interval of 60cm in tunnel The gate pilot tunnel temporary support of the parallel main tunnel middle line of a Pin is erected, upper height is more than the main tunnel outer 40cm of design excavation contour line, 23 Pin are arranged in gate support altogether;Gate temporary support is processed using I 20b steelframe, and supporting leg and horizontal gird part are using welding, often A supporting leg position respectively set up and down 4 root long degree 2.0m,Foot anchor tube is locked, arch sets l=3.5m, spacing 40cmIn advance Ductule, outer 10~40 ° of the limb of main tunnel middle line right side ductule, left side is set as 9 °;
(8) after pilot tunnel is excavated to left side from the right side of main tunnel, pilot tunnel arch crossbeam is not removed, it is tampered to be mounted directly 4 Pin Main tunnel steelframe, steelframe right side are located on the joist of inclined shaft oral area reinforcing ring, are equipped with ring flange by 60cm spacing on joist, It is connected firmly with joist using high-strength bolt;It is anchored on ground on the left of steelframe with lock foot anchor tube, after dowel and mesh sheet are installed Gunite concrete installs wall rock's level element, reinforces monitoring;It is filled up between main tunnel circumferential direction steelframe and joist with gunite concrete, It must not there are gaps;The Φ 42mm that long 4m is respectively applied at steelframe merogenesis and at arch springing locks foot anchor tube two;
(9) 1# inclined shaft is into main tunnel after big mileage direction carries out excavation supporting a distance in advance, then carries out trolley in hole and spell It fills, spelling takes extension hanging ring in trolley hole, and the scheme of elevator machine equipment lifting load-bearing panel is utilized to implement;Most according to lifting appliance Big lifting distance, the design of long rope length in reserve, main tunnel preliminary bracing headroom suitably amplify, and amplify 50cm by headroom, simultaneously Inverted arch fill surface reduces 30cm by design altitude and accounts for.
The step (6) further comprises: tunnel-liner guarantees that its middle line, level, cross dimensions, headroom size meet and sets Meter requires, no matter every lining cutting circulation length will measure setting-out, review is checked;Formwork jumbo is accurately in place, template face light Sliding smooth, spillage, seam be not tightly neat;Template is conscientiously rebuild after demoulding, keeps every section of liner joint smooth, the outer light of interior reality;
One of deformation joint is being set close to main tunnel side simultaneously, is preventing from generating crack due to differential settlement;
In view of construction machinery construction operability, while considering that main track tunnel and main tunnel vault height difference are big, is analyzed, led The earthwork is filled to inclined shaft main tunnel when hole is excavated for the first time, fills ramp ratio of slope 33%, after pilot drive tunnels 3m, carries out the The secondary stone that bankets that rams fills ramp, and ratio of slope 21% of climbing is climbed 19.5 meters of section.Main tunnel I25a I-shaped steel feet falls in lower curved section door Frame is connected using 10 × M27 high-strength bolt, and junction steel plate δ=16mm thick steel plate, door frame upper beam junction steel plate is in advance in reinforcing bar In-site installation is transported to after processing factory's welding.
The step (7) further comprises: pilot tunnel vault, side wall arch hang@20*20,Then steel mesh sprays 25cm Thick C25 concrete;Settlement observation point is arranged by 3m spacing in pilot tunnel arch;Reinforce mapping in pilot tunnel work progress and geology is pre- Survey work;Base tunnel construction muck removal is all made of loading machine and has bad luck to entrucking at inclined shaft lay-by, is transported to spoil disposal area outside hole outside.
The step (8) further comprises: joist uses bolt in repacking steelframe upside flange plate and strengthening segment steelframe Connection;Steelframe foot is welded as II type joint at haunch on the right side of main tunnel, welds 32 channel steels, and to increase arch springing stability, bottom falls within 2 On the longitudinal 20 × 20cm lumps of wood of root, steelframe is suitable in across the inclined shaft range of main tunnel;
It determines and first constructs to big mileage after the completion of caunching, then construct to small mileage;In pilot tunnel after the completion of main tunnel preliminary bracing, The gib at the big mileage end of pilot tunnel is removed, main tunnel top bar excavation and support is carried out, uses the interim inverted arch of three steps by design The big mileage direction excavation of normal direction, supporting 35m, carry out inverted arch in time and inverted arch filling performs, and face continues to tunnel to 100m and stop It only constructs and closes face, the inverted arch that follows up in time, filling lift by crane lining cutting panel operation creation for trolley assembly rear and front end and apply Space is done, it is assembled to carry out lining trolley;It pushes away trolley to inclined shaft and main tunnel intersection in time after the completion of trolley is assembled and pours building lining, Construction is preceding to arrange concrete transfer pipeline to main tunnel lining trolley, inclined shaft with implementing in main tunnel series connection of pumps in inclined shaft into main tunnel transposition section Conveying, inclined shaft is interior to carry out overall process with positive in-cavity construction, monitors with journey intercommunication, it is ensured that lining cutting, which pours, to be rapidly completed;
Meanwhile after big mileage supporting closing cyclization, situation is analyzed according to monitoring measurement, remove in due course pilot tunnel temporary support into The excavation supporting work of the small mileage section of row stops excavation supporting, and inverted arch construction of following up, performs when small mileage section is constructed to 40m Inclined shaft, the small mileage secondary lining of main tunnel intersection section, give large and small mileage face tunneling construction by normal process circulation again; According to design, construct by main tunnel Ve support lining standard section;
When small mileage stops excavation supporting, u-turn carries out big mileage main tunnel top bar excavation and support; DK213+520- DK213+560 uses three step provided core soil method excavation constructions.
Further comprise: main tunnel supporting parameter, lower curved section main tunnel are designed as V e composite lining, preliminary bracing parameter: pre- Deflection 40cm is stayed, arch wall sets I25a i-beam frame, spacing 0.6m/ Pin;Arch, wall paper are setSteel mesh, size of mesh opening 20 × 20cm;22 dowel of Φ, 1.0 meters of circumferential spacing are set between steelframe;Arch, wall spray C25 concrete, spray concrete with a thickness of 35cm.
Advantages of the present invention and good effect are as follows: specific technique is caunched compared with prior art using tunnel, there is operation The characteristics of simplicity, save the cost, rapid construction.
(1) it is constructed using the prior art: needing the 10m range at proximity tunnel main tunnel, gradually raise inclined shaft preliminary bracing Vault elevation, inclined shaft headroom dig, and increase inclined shaft arch specification and size, then main tunnel steelframe is stopped on inclined shaft arch.① Inclined shaft is turned up section and digs 5~7m3/m of project amount;2. inclined shaft is turned up section and uses I20a I-steel, spacing is encrypted to 0.6m/ Pin, is put down Every linear meter(lin.m.) increases steel using amount 193Kg/m, total 10m, increases steel using amount 1930Kg altogether, and inclined shaft and main tunnel junction increase by 3 Pin I25a annular brace steelframe, every Pin 1.7t, increases 5.1t altogether;3. every Pin I20a steelframe welding and assembly, need 6 scaffolders, It works 5 hours and completes welding, installation, need 10 working days, loading machine coordinative construction altogether;4. main tunnel I25a abnormal shape steelframe is average every Pin 1.23t/ Pin, totally 13 Pin, increases steel using amount: 1.93+5.1+1.23*13=23.02t;It is additional to increase earthwork: 67m3,; Total man-hour requirement: 6 people × 5 hour × 10 day=300 working hours, overall mechanical machine-team need: 0.5 × 10=5 mechanical one-shift.
(2) using tunnel caunch specific technique construction: need at proximity tunnel main tunnel 10m range, by original design arch It is adjusted to I20b arch, spacing is adjusted to 0.6m, and inclined shaft and main tunnel intersection increase by 5 Pin I25a welding I-shaped door type beams, then will Main tunnel steelframe is stopped on door beam.1. inclined shaft proximity main tunnel strengthening segment uses I20b I-steel, spacing is encrypted to 0.6m/ Pin, is put down Every linear meter(lin.m.) increases steel using amount 102Kg/m, total 10m, increases steel using amount 1020Kg altogether, and inclined shaft and main tunnel junction increase by 5 Pin I25a annular brace steelframe, every Pin 0.85t, increases by 4.25 altogether;3. every Pin I20a steelframe welding and assembly, need 6 scaffolders, It works 3 hours and completes welding, installation, need 6 working days, loading machine coordinative construction altogether;4. main tunnel I25a abnormal shape steelframe is average every Pin 0.67t/ Pin, totally 15 Pin, increases steel using amount: 1.02+4.25+0.67*15=15.32t;Total man-hour requirement: 6 people × 3 hour × 6 days=108 working hours, overall mechanical machine-team need: 1 × 6=6 mechanical one-shift.
Two methods comparison, tunnel caunch technology than prior art saving excavation project amount: steel is used in 67-0=67m3, saving Amount: 23.02-15.32=7.7t;Save working hour: 300-108=192 working hour;Mechanical one-shift: 5-6=-1 mechanical one-shift.Construction Economic benefits.
It is shown by Monitoring During The Access, is caunched specific technique using tunnel, surrouding rock deformation, landslide risk is effectively reduced, Accumulative settling amount only 3.5mm is surveyed, and quickly forms closed loop, saves 8 working days compared with the prior art.From safety, economy, skill Art, the tunnel specific technique that caunches is for optimal case in terms of progress.
Detailed description of the invention
Fig. 1 is that tunnel slope provided in an embodiment of the present invention caunches special construction method flow chart.
Fig. 2 is that Men Liang provided in an embodiment of the present invention takes structural schematic diagram.
Fig. 3 is main tunnel provided in an embodiment of the present invention and inclined shaft section relative position schematic diagram.
Fig. 4 is intersection main tunnel steelframe repacking provided in an embodiment of the present invention and joist thin portion schematic diagram.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to Limit the present invention.
Application principle of the invention is explained in detail with reference to the accompanying drawing.
The special construction method as shown in Figure 1, tunnel slope provided in an embodiment of the present invention caunches the following steps are included:
S101: 92 ° of inclined shaft and the main tunnel plane angle of cut, in inclined shaft close to fare register is intersected with main tunnel, main tunnel intersects with inclined shaft Mileage rises, and enters main tunnel tunnel cutting using small base tunnel;
S102: attentioning branch steelframe at the beginning of hole in pilot tunnel internal frame, excavates by three step normal direction two sides into main tunnel standard section, construction Main tunnel just Zhi Houdu and the prearrangement of deformation amount amount of sinking need to be reserved when pilot tunnel.
Application principle of the invention is further described combined with specific embodiments below.
1, basic construction process: benching tunnelling method excavates (short drilling depth) → abutment wall of getting out of a predicament or an embarrassing situation on the left of inclined shaft and erects steelframe, jetting cement → lag left side 3m excavate right side get out of a predicament or an embarrassing situation (short drilling depth) → wall stand stand steelframe, jetting cement → paragraph by paragraph excavate inclined shaft resistance to compression lining cutting face upward Encircle (FLOOR method is determined according to foundation bearing capacity) → installation inverted arch steelframe, jetting cement → and binds inclined shaft resistance to compression lining cutting inverted arch paragraph by paragraph Reinforcing bar → paragraph by paragraph pouring reinforced concrete inverted arch → applies 5 Pin I25a I-shaped steel door frame of transposition section → piecewise binding inclined shaft resistance to compression lining Build that two lined steel muscle → trolley is in place, formwork erection pours C40 concrete → demoulding → mechanical engagement and manually excavates small cavities' pilot tunnel → frame by Pin Vertical cavern I20b steelframe → main tunnel top bar fashioned iron erects within the scope of pilot tunnel → removes one heel post of pilot tunnel → main tunnel unilateral side step Main tunnel face → excavation other side main tunnel → closing face → interface section main tunnel two lining, main tunnel are excavated → closed to method to two sides It excavates.
2, inclined shaft is designed into main tunnel strengthening segment
Inclined shaft is designed as V grade of moulded lining Support types of loess tunnel into main tunnel intersection section original.Consider inclined shaft into main tunnel Special zone construction, surrouding rock stress condition, reinforce inclined shaft supporting parameter, and increase deformation allowance to 15cm, inclined shaft It is 10m that segment length is reinforced in lining cutting.Resistance to compression lining cutting section supporting parameter: arch wall erects I20a profile steel frame, and spacing 0.6m amounts to 17 Pin, resistance to compression lining cutting use C40 concrete, and structure reinforcing bars use bilayer HRB400 Ф 25mm reinforcing bar, and main reinforcement spacing 20cm is net to protect Thickness degree 5cm;Inverted arch uses C40 concrete, thick 60cm, and reinforcing bar uses HRB400 Ф 25mm reinforcing bar, and main reinforcement spacing 20cm is net to protect Covering thickness 5cm;Inverted arch filling uses C30 plain concrete, thick 72.9cm.
3, inclined shaft and main tunnel transposition section gantry design
Consider to lead arch in main tunnel to stop over the fastness of position, inclined shaft arch must provide a platform of firmly stopping over. In main tunnel leftwall and inclined shaft intersection, using erecting five Pin I25a profile steel frames side by side, and door beam is set at the top of arch and is come Main tunnel top arch is supported, door beam uses 5 Pin I25a I-steel weldings, and Men Liang rides upon inclined shaft arch.
Door beam connection, which is all made of, to be bolted, in the construction process, it is necessary to be installed, be guaranteed vertical according to design drawing position Column, crossbeam position are accurate.UsingFoot anchor tube is locked, secured with column and beam welding respectively, anchor tube length is 5.0m, is Concrete continuous footing is arranged in reinforced door beam integral stability, door beam column footing, and cross sectional dimensions 1.87m × 0.6m is long 1.0m, I-shaped steel feet welding steel size 50cm (width) × 75cm (length) × 16mm (thickness) are used with strip footing pre-embedded steel slab The connection of M27 × 70mm high-strength bolt (note: strip footing pre-embedded steel slab having a size of 50cm (width) × 75cm (length) × 16mm (thickness), Steel plate welds 22 dowel of Ф, joint length 65cm).
For reinforced door beam entirety stability under loading, lateral connection, welding beam and slope invert is arranged in door joist steel arch bottom First branch steelframe design is consistent, is placed between two Pin steelframe of slope invert, and gunite concrete forms entirety.
Climbing carries out main tunnel ripping construction after first performing slope mouth lining cutting before caunching again, it is contemplated that construction machinery construction Operability, while considering that main track tunnel and main tunnel vault height difference are big, through determining, pilot tunnel first time excavation fills ramp and climbs Slope ratio of slope 33%, after pilot drive drilling depth 3m, progress rams the stone that bankets for the second time and fills ramp, ratio of slope 21% of climbing, section of climbing 19.5 meters.
Integrating tunnel stress condition erects the duck eye of the parallel main tunnel middle line of a Pin within the scope of tunnel main tunnel at interval of 60cm Room preliminary bracing structure, upper height is more than the main tunnel outer 40cm, that is, anticipated settlement 40cm of design excavation contour line, in order to pacify Main tunnel steelframe is filled, it is individually designed that 22 Pin, which are arranged, in small cavities' steelframe altogether.
4, inclined shaft caunches scheme into main tunnel
(1) inclined shaft arch foot basis is applied
Inclined shaft proximity main tunnel 20m range, setting is reinforced, encrypts 33 Pin of steelframe altogether.
When getting out of a predicament or an embarrassing situation on the left of excavating, width 1.0m, the slot of deep 0.6m are excavated in abutment wall foot bottom, and pour C35 concrete and make arch springing Bottom strip footing hangs steel mesh to abutment wall in time and carries out just spray closing, installs I20a arch and welded H RB400 Φ 22 is vertical To dowel, haunch, arch springing steelframe unit junction respectively set 4 root longsLock foot anchor tube and with arch firm welding, lock 30 °~50 ° of the oblique angle of declination of foot anchor tube sprays the solidifying soil of C30 coagulation to design thickness 27cm, to inhibit steelframe to be made by surrouding rock stress again With sinking, feet steel plate, size 60cm × 60cm × 1.6cm are arranged to arch foot bottom, I-steel of getting out of a predicament or an embarrassing situation respectively welds 1 up and down Longitudinally connected [the 32a channel steel in road.
Excavate right side of getting out of a predicament or an embarrassing situation in time after 3m on the left of lag, working procedure is got out of a predicament or an embarrassing situation with left side.
(2) inverted arch is applied
To inclined shaft and main tunnel intersection, inverted arch is excavated immediately following getting out of a predicament or an embarrassing situation excavation supporting, in order to ensure inclined shaft caunches beaer System stablizes, and reduces later period main tunnel steelframe and stops in the deformation of sedimentation on inclined shaft door frame top, analyzes ground loading test result On the basis of, special reinforcement is carried out in inclined shaft and main tunnel intersection section inclined shaft liner structure and substrate when necessary, substrate is changed rammer and filled out The processing of 1m thickness 37 lime earth, layered rolling, compactness 0.97, after the completion of rolling, installation inverted arch I20b I-steel steelframe and and side The connection of wall steelframe, spray C25 concrete to design thickness.Inverted arch HRB400 Ф 25mm reinforcing bar, main reinforcement spacing 20cm are bound, formwork erection pours C40 concrete, inverted arch excavation supporting to main tunnel joins at mileage, and pours C40 reinforced concrete inverted arch in time.
(3) erection of gantry
After inverted arch concrete strength reaches design strength, in main tunnel leftwall and inclined shaft intersection, using erecting five Pin side by side I25a profile steel frame, and door beam is set to support main tunnel top arch at the top of arch, door beam is spelled using 5 Pin I25a I-steel Weldering, Men Liang ride upon inclined shaft arch.
In Fig. 2, lateral connection is arranged in door joist steel arch bottom, and welding beam and slope invert just branch steelframe design are consistent, It is placed between two Pin steelframe of slope invert, and gunite concrete forms entirety.It is anti-that liner structure is designed as C40 armored concrete Press Lining Ring.
Door beam connection, which is all made of, to be bolted, in the construction process, it is necessary to be installed, be guaranteed vertical according to design drawing position Column, crossbeam position are accurate.UsingFoot anchor tube is locked, secured with column and beam welding respectively, anchor tube length is 4.5m, to add Strong door beam integral stability, door beam column footing setting concrete continuous footing, cross sectional dimensions 1.87m × 0.6m, long 1.0m, I-shaped steel feet welding steel size 50cm (width) × 75cm (length) × 16mm (thickness), with strip footing pre-embedded steel slab using M27 × (note: strip footing pre-embedded steel slab is having a size of 50cm (width) × 75cm (length) × 16mm (thickness), steel plate weldering for the connection of 70mm high-strength bolt Meet 22 dowel of Ф, joint length 65cm).
(4) it applies inclined shaft and intersects strengthening segment lining cutting with main tunnel
After the completion of door frame, it is in place to push away trolley, and concrete is mixed and stirred using automatic gauge blending station, pump concrete construction Skill.Tunnel-liner must assure that its middle line, level, cross dimensions, headroom size meet design requirement, no matter every lining cutting circulation is long Short to measure setting-out, review checks.Formwork jumbo is accurately in place, and template face is smooth smooth, and spillage, seam be not tightly whole Together.Template is conscientiously rebuild after demoulding, keeps every section of liner joint smooth, the outer light of interior reality.
One of deformation joint is being set close to main tunnel side simultaneously, is preventing from generating crack due to differential settlement;Main tunnel and tiltedly Fig. 3 is seen in well profile relative position, and the repacking of intersection main tunnel steelframe and joist thin portion are shown in Fig. 4.
In figure, the arch of inclined shaft proximity main tunnel intersection 20m range reinforces tectonic sieving, is by by original I16 I-shaped Steel is adjusted to I20a I-steel steelframe, and spacing, which is encrypted to 0.6m, to be arranged, lifting inclined well and main tunnel transposition section composite lining structure Support capacity encircles that arch ring uniformly carries and tunnel structure is safe and stable provides guarantor for caunch operation, later period pressure from surrounding rock of inclined shaft Barrier.
(5) ramp is filled
In view of construction machinery construction operability, while considering that main track tunnel and main tunnel vault height difference are big, is analyzed, led The earthwork is filled to inclined shaft main tunnel when hole is excavated for the first time, fills ramp ratio of slope 33%, after pilot drive tunnels 3m, carries out the The secondary stone that bankets that rams fills ramp, and ratio of slope 21% of climbing is climbed 19.5 meters of section.Main tunnel I25a I-shaped steel feet falls in lower curved section door frame It is connected using 10 × M27 high-strength bolt, junction steel plate δ=16mm thick steel plate, door frame upper beam junction steel plate adds in reinforcing bar in advance In-site installation is transported to after factory's welding.
5, small cavities construct
After completing preparation, start to carry out small cavities' construction;It is small perpendicular to one 3.5m of main tunnel middle line hand excavation clear span Cavern, erects small cavities' supporting steelframe of the parallel main tunnel middle line of a Pin in tunnel at interval of 60cm, and upper height is more than main tunnel The outer 40cm (i.e. anticipated settlement 40cm) of excavation contour line is designed, in order to install main tunnel steelframe, small cavities' supporting steelframe is set altogether Set 22 Pin, be it is individually designed, height of landing leg and Auxiliary support are detailed in rear attached drawing;Small cavities' supporting steelframe is added using I 20b steelframe Work, supporting leg and horizontal gird part using welding, each supporting leg position respectively set up and down 4 root long degree 2.0m,Foot anchor tube is locked, Arch sets l=3.5m, spacing 40cmAdvanced tubule, outer 10~40 ° of the limb of main tunnel middle line right side ductule, left side is equal It is set as 9 °.To reinforce pilot tunnel entirety stress condition, increases steelframe support stiffness and stability, prevent arch ground chip off-falling, duck eye Room supporting steel arch top, side wall arch hang,Then steel mesh sprays 25cm thickness C25 concrete;It presses between 3m arch Away from setting settlement observation point, periodically it is monitored;In pilot tunnel work progress reinforce mapping and Geological Prediction work, such as with set Meter is not inconsistent, and timely feedbacks, and modifies supporting scheme.
Small cavities' supporting muck removal: since small cavities' excavated section is smaller, construction muck removal is all made of loading machine and has bad luck to inclined shaft Entrucking at lay-by is transported to spoil disposal area outside hole outside.
6, section main tunnel in intersection is excavated
After pilot tunnel is excavated to left side from the right side of main tunnel, pilot tunnel arch crossbeam is not removed, is mounted directly the tampered main tunnel of 5 Pin Steelframe, steelframe right side are located on the joist of inclined shaft oral area reinforcing ring, ring flange are equipped with by 60cm spacing on joist, with joist It is connected firmly using high-strength bolt;It is anchored on ground on the left of steelframe with lock foot anchor tube, injection is mixed after installing dowel and mesh sheet Solidifying soil, installs wall rock's level element, reinforces monitoring;It is filled up, must not be stayed with gunite concrete between main tunnel circumferential direction steelframe and joist There is gap.The Φ 42mm that long 4m is respectively applied at steelframe merogenesis and at arch springing locks foot anchor tube two.
Joist is connected by screw bolts in repacking steelframe upside flange plate and strengthening segment steelframe;Steel at haunch on the right side of main tunnel Frame foot is welded as II type joint, welds 32 channel steels, and to increase arch springing stability, bottom is fallen on 2 longitudinal direction 20 × 20cm lumps of wood, The steelframe is suitable in across the inclined shaft range of main tunnel.
In view of inclined shaft is into the working sequence of the two-way driving of main tunnel, main tunnel surrounding rock stability is poor, the assembled sky of lining trolley Between factor, determine caunch after the completion of first to big mileage construct, then to small mileage construct.Main tunnel preliminary bracing is completed in pilot tunnel Afterwards, the gib at the big mileage end of pilot tunnel is removed, main tunnel top bar excavation and support is carried out, is temporarily faced upward by design using three steps Encircle the big mileage direction excavation of normal direction, supporting about 35m, carries out inverted arch in time and inverted arch filling performs, face continues driving extremely 100m stops constructing and closes face, and the inverted arch that follows up in time, filling lift by crane the operation of lining cutting panel for trolley assembly rear and front end Creation performs space, and it is assembled to carry out lining trolley.Trolley to inclined shaft and main tunnel intersection is pushed away in time after the completion of trolley is assembled to pour Building lining arranges concrete transfer pipeline to main tunnel lining cutting in inclined shaft before construction to pour convenient for transposition section lining cutting into main tunnel transposition section Implement ground series connection of pumps in trolley, inclined shaft and main tunnel to convey, carry out overall process with positive in-cavity construction in inclined shaft, monitored with journey intercommunication, Ensure that lining cutting pours to be rapidly completed.
Meanwhile after big mileage supporting closing cyclization, situation is analyzed according to monitoring measurement, remove in due course pilot tunnel temporary support into The excavation supporting work of the small mileage section of row stops excavation supporting, and inverted arch construction of following up, performs when small mileage section is constructed to 40m Inclined shaft, the small mileage secondary lining of main tunnel intersection section, give large and small mileage face tunneling construction by normal process circulation again. According to design, construct by main tunnel Ve support lining standard section.
When small mileage stops excavation supporting, u-turn carries out big mileage main tunnel top bar excavation and support. DK213+520- DK213+560 uses three step provided core soil method excavation constructions.
7, trolley assembly section designs
2# inclined shaft is into main tunnel after big mileage direction carries out excavation supporting a distance in advance, then to carry out trolley in hole assembled, Through contacting with trolley producer, spelling takes extension hanging ring in this trolley hole, utilizes the scheme of elevator machine equipment lifting load-bearing panel Implement.According to lifting appliance maximum lifting distance, the design of long rope length in reserve, main tunnel preliminary bracing headroom is suitably amplified, Amplify 50cm by headroom, while inverted arch fill surface reduces 30cm by design altitude and accounts for.
8, main tunnel supporting parameter
Lower curved section main tunnel is designed as V e composite lining, preliminary bracing parameter: deformation allowance 40cm, arch wall set I25a I-beam frame, spacing 0.6m/ Pin;Arch, wall paper are setSteel mesh, 20 × 20cm of size of mesh opening;22 dowel of Φ is set between steelframe, 1.0 meters of circumferential spacing;Arch, wall spray C25 concrete, spray concrete with a thickness of 35cm.
9, construction precautions
1. slope mouth and main tunnel joint must lining cutting perform after can carry out climbing ripping construction.
2. locking foot anchor tube must be using U-shaped steel muscle and arch firm welding.
3. carrying out protection of the attention to inclined shaft arch wall splash guard and waterstop when ripping construction after lining cutting.
4. small pilot tunnel takes off quarrel, loading machine dress quarrel using excavator, dump truck fortune quarrel excavates 0.8 meter of cyclic advance.
5. when small pilot drive, paying attention to controlling vault absolute altitude, interior lateral edge main tunnel excavation contour line arrangement is just propped up at top, and pre- Stay 40cm construction error and deformation of sedimentation.
6. small pilot tunnel uses rectangular cross section, 3.0 meters of clear span in section, highly according to main tunnel excavation contour line absolute altitude calculate into Row control, arch springing are forbidden vacantly, it is necessary to fall in solid foundation.
7. completely spraying concrete supporting using linked network at the top of small pilot tunnel, two sides abutment wall is closed using element spray 5~8cm thickness concrete, is encircleed Foot sprays 50cm concrete.
8. increasing monitoring measurement frequency during small pilot drive, according to metric data guiding construction, guarantee construction safety.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.

Claims (5)

  1. The special construction method 1. a kind of tunnel slope caunches, which is characterized in that the tunnel slope caunches special construction method Include: inclined shaft proximity main tunnel intersection fare register, in intersection interface, enters main tunnel tunnel cutting using small base tunnel is excavated, leading Hole internal frame is attentioned hole just branch steelframe, and is erected and a little acted on 5 Pin of the inclined shaft splicing top Men Liang, is implemented to be bolted, be completed in early days Then the firm system of closed loop support is excavated by three step normal direction two sides into main tunnel standard section, construct base tunnel when need to reserve just Just Zhi Houdu and reserved 40cm deforms the amount of sinking in hole;
    73 ° of inclined shaft and the main tunnel plane angle of cut intersect fare register in inclined shaft proximity main tunnel, and main tunnel intersects mileage with inclined shaft and rises, uses Small cavities enter main tunnel tunnel cutting;
    It attentions branch steelframe at the beginning of hole in pilot tunnel internal frame, excavates by three step normal direction two sides into main tunnel standard section, when constructing pilot tunnel needs Reserve main tunnel just Zhi Houdu and the prearrangement of deformation amount amount of sinking;
    The tunnel slope caunch special construction method specifically includes the following steps:
    (1) inclined shaft is designed as V grade of moulded lining Support types of loess tunnel into main tunnel intersection section original, considers inclined shaft into main tunnel Special zone construction, surrouding rock stress condition, reinforce inclined shaft supporting parameter, and increase deformation allowance to 15cm, inclined shaft It is 20m that segment length is reinforced in lining cutting;Resistance to compression lining cutting section supporting parameter: arch wall erects I20a profile steel frame, and spacing 0.6m amounts to 33 Pin, bent wall band inverted arch resistance to compression lining cutting use C40 concrete, and structure reinforcing bars use bilayer HRB400 Ф 20mm reinforcing bar, main reinforcement spacing 20cm, net protective layer thickness 5cm;Inverted arch uses C40 concrete, most thick 115cm, and reinforcing bar uses HRB400 Ф 20mm reinforcing bar, main Muscle spacing 20cm, net protective layer thickness 5cm, distributing reinforcement is using 14 reinforcing bar of HRB400 Ф, and spacing 25cm, hook muscle is using HPB300 Φ 8 reinforcing bars indulge circumferential direction spacing 20cm × 25cm;
    (2) in main tunnel leftwall and inclined shaft intersection, using erecting five Pin I25a profile steel frames side by side, and it is arranged at the top of arch Door beam supports main tunnel top arch, and door beam uses 5 Pin I25a I-steel weldings, Men Liang rides upon inclined shaft arch;
    (3) connection of door beam, which is all made of, is bolted, and usesLock foot anchor tube, secured with column and beam welding respectively, anchor tube Length is 4.5m, and door beam column footing is arranged concrete continuous footing, cross sectional dimensions 1.87m × 0.6m, and I-shaped steel feet and welds Plate size 50cm × 75cm × 16mm is met, is connect with strip footing pre-embedded steel slab using M27 × 70mm high-strength bolt, steel plate weldering 22 dowel of Ф, joint length 65cm are connect, lateral connection, welding beam and the first branch steelframe of slope invert is arranged in door joist steel arch bottom Design is consistent, is placed between two Pin steelframe of slope invert, and gunite concrete forms entirety;Liner structure is designed as C40 reinforcing bar Concrete anti-compression Lining Ring;
    (4) climbing is caunched slope mouth lining cutting is performed after carry out main tunnel ripping construction again, while being encircleed according to main track tunnel and main tunnel It is big to rise difference, pilot tunnel first time, which excavates, fills ramp climbing ratio of slope 33%, and after pilot drive drilling depth 3m, second of rammer of progress is filled out Native stone fills ramp, and ratio of slope 21% of climbing is climbed 19.5 meters of section;
    (5) integrating tunnel stress condition erects the gate of the parallel main tunnel middle line of a Pin within the scope of tunnel arch at interval of 60cm Temporary support, erects the gate temporary support of the parallel main tunnel middle line of a Pin within the scope of tunnel haunch at interval of 80cm, and top is high Degree is more than the main tunnel outer 40cm, that is, anticipated settlement 40cm of design excavation contour line, and it is individually to set that 22 Pin, which are arranged, in gate support altogether Meter;
    (6) lower curved section excavate and just branch after the completion of, into main tunnel work of caunching start before, applied in the intersection of inclined shaft and main tunnel Make 10m secondary lining;Inclined shaft lining cutting uses formwork jumbo lining cutting, and concrete is mixed and stirred using automatic gauge blending station, pumped concrete Native construction technology;
    (7) pilot tunnel construction is carried out;Perpendicular to main tunnel middle line hand excavation's clear span 3.5m pilot tunnel, erected in tunnel at interval of 60cm The gate pilot tunnel temporary support of the parallel main tunnel middle line of one Pin, upper height are more than the main tunnel outer 40cm of design excavation contour line, gate 22 Pin are arranged in support altogether;Gate temporary support is processed using I 20b steelframe, and supporting leg and horizontal gird part are using welding, Mei Gezhi Leg position respectively set up and down 4 root long degree 2.0m,Foot anchor tube is locked, arch sets l=3.5m, spacing 40cmIt is small in advance to lead Pipe, outer 10~40 ° of the limb of main tunnel middle line right side ductule, left side is set as 9 °;
    (8) after pilot tunnel is excavated to left side from the right side of main tunnel, pilot tunnel arch crossbeam is not removed, is mounted directly the tampered main tunnel of 4 Pin Steelframe, steelframe right side are located on the joist of inclined shaft oral area reinforcing ring, ring flange are equipped with by 60cm spacing on joist, with joist It is connected firmly using high-strength bolt;It is anchored on ground on the left of steelframe with lock foot anchor tube, injection is mixed after installing dowel and mesh sheet Solidifying soil, installs wall rock's level element, reinforces monitoring;It is filled up, must not be stayed with gunite concrete between main tunnel circumferential direction steelframe and joist There is gap;The Φ 42mm that long 4m is respectively applied at steelframe merogenesis and at arch springing locks foot anchor tube two;
    (9) 1# inclined shaft is into main tunnel after big mileage direction carries out excavation supporting a distance in advance, then assembled, the platform that carries out trolley in hole Spelling takes extension hanging ring in vehicle hole, and the scheme using elevator machine equipment lifting load-bearing panel is implemented;It is risen according to lifting appliance maximum Distance, the design of long rope length in reserve are hung, main tunnel preliminary bracing headroom suitably amplifies, and amplifies 50cm, while inverted arch by headroom Fill surface reduces 30cm by design altitude and accounts for.
  2. The special construction method 2. tunnel slope as described in claim 1 caunches, which is characterized in that the step (6) is further It include: that tunnel-liner guarantees that its middle line, level, cross dimensions, headroom size meet design requirement, no matter every lining cutting circulation length Setting-out will be measured, review checks;Formwork jumbo is accurately in place, and template face is smooth smooth, and spillage, seam be not tightly whole Together;Template is conscientiously rebuild after demoulding, keeps every section of liner joint smooth, the outer light of interior reality;
    One of deformation joint is being set close to main tunnel side simultaneously, is preventing from generating crack due to differential settlement;
    In view of construction machinery construction operability, while considering that main track tunnel and main tunnel vault height difference are big, through analyzing, pilot tunnel is first The earthwork is filled to inclined shaft main tunnel when secondary excavation, fills ramp ratio of slope 33%, after pilot drive tunnels 3m, is carried out second The rammer stone that bankets fills ramp, and ratio of slope 21% of climbing is climbed 19.5 meters of section;Main tunnel I25a I-shaped steel feet falls in the use of lower curved section door frame The connection of 10 × M27 high-strength bolt, junction steel plate δ=16mm thick steel plate, door frame upper beam junction steel plate is in advance in reinforcement yard In-site installation is transported to after welding.
  3. The special construction method 3. tunnel slope as described in claim 1 caunches, which is characterized in that the step (7) is further Include: pilot tunnel vault, side wall arch hang@20*20,Then steel mesh sprays 25cm thickness C25 concrete;Press 3m in pilot tunnel arch Settlement observation point is arranged in spacing;Reinforce mapping and Geological Prediction work in pilot tunnel work progress;Base tunnel construction muck removal is adopted It is had bad luck with loading machine to entrucking at inclined shaft lay-by, is transported to spoil disposal area outside hole outside.
  4. The special construction method 4. tunnel slope as described in claim 1 caunches, which is characterized in that the step (8) is further It include: to reequip joist on steelframe upside flange plate and strengthening segment steelframe to be connected by screw bolts;Steelframe foot at haunch on the right side of main tunnel It is welded as II type joint, welds 32 channel steels, to increase arch springing stability, bottom is fallen on 2 longitudinal direction 20 × 20cm lumps of wood, steelframe Suitable in across the inclined shaft range of main tunnel;
    It determines and first constructs to big mileage after the completion of caunching, then construct to small mileage;In pilot tunnel after the completion of main tunnel preliminary bracing, remove The gib at the big mileage end of pilot tunnel carries out main tunnel top bar excavation and support, uses the interim inverted arch normal direction of three steps by design Big mileage direction excavation, supporting 35m, carry out inverted arch in time and inverted arch filling performs, and face continues driving and stops applying to 100m Work simultaneously closes face, the inverted arch that follows up in time, filling, lifts by crane lining cutting panel operation creation for trolley assembly rear and front end and performs sky Between, it is assembled to carry out lining trolley;It pushes away trolley to inclined shaft and main tunnel intersection in time after the completion of trolley is assembled and pours building lining, construct Preceding to arrange concrete transfer pipeline to main tunnel lining trolley into main tunnel transposition section in inclined shaft, inclined shaft with implementing in main tunnel series connection of pumps is defeated It send, carries out overall process with positive in-cavity construction in inclined shaft, monitored with journey intercommunication, it is ensured that lining cutting, which pours, to be rapidly completed;
    Meanwhile after big mileage supporting closing cyclization, situation is analyzed according to monitoring measurement, dismounting pilot tunnel temporary support carries out small in due course The excavation supporting of mileage section works, and when small mileage section is constructed to 40m, stops excavation supporting, and inverted arch construction of following up, performs tiltedly Well, the small mileage secondary lining of main tunnel intersection section, give large and small mileage face tunneling construction by normal process circulation again;Root According to design, construct by main tunnel Ve support lining standard section;
    When small mileage stops excavation supporting, u-turn carries out big mileage main tunnel top bar excavation and support;DK213+520-DK213 + 560 use three step provided core soil method excavation constructions.
  5. The special construction method 5. tunnel slope as described in claim 1 caunches, which is characterized in that further comprise: main tunnel branch Parameter is protected, lower curved section main tunnel is designed as V e composite lining, and preliminary bracing parameter: deformation allowance 40cm, arch wall set I25a work Word steelframe, spacing 0.6m/ Pin;Arch, wall paper are setSteel mesh, 20 × 20cm of size of mesh opening;22 dowel of Φ, ring are set between steelframe To 1.0 meters of spacing;Arch, wall spray C25 concrete, spray concrete with a thickness of 35cm.
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CN108533295B (en) * 2018-02-01 2019-12-10 中铁十二局集团有限公司 Natural pilot tunnel top-lifting method
CN111255476A (en) * 2020-01-19 2020-06-09 中交一公局第四工程有限公司 Tunnel multi-section three-dimensional intersection construction method
CN111236961B (en) * 2020-02-29 2021-04-30 中建七局交通建设有限公司 Construction method of expandable mudstone orthogonal inclined shaft detachable portal frame
CN111520144A (en) * 2020-03-31 2020-08-11 中交一公局第四工程有限公司 Tunnel intersection small pilot tunnel construction method

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