CN108842819A - A kind of urban track traffic cable run method for tunnel construction - Google Patents

A kind of urban track traffic cable run method for tunnel construction Download PDF

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Publication number
CN108842819A
CN108842819A CN201811044177.6A CN201811044177A CN108842819A CN 108842819 A CN108842819 A CN 108842819A CN 201811044177 A CN201811044177 A CN 201811044177A CN 108842819 A CN108842819 A CN 108842819A
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China
Prior art keywords
pile
construction
bracing members
steel sheet
steel
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CN201811044177.6A
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CN108842819B (en
Inventor
刘子义
苏学虎
李祥飞
柏长东
张�浩
张威
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Ceec Anhui Electric Power Construction First Engineering Co Ltd
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Ceec Anhui Electric Power Construction First Engineering Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00Independent underground or underwater structures; Retaining walls
    • E02D29/10Tunnels or galleries specially adapted to house conduits, e.g. oil pipe-lines, sewer pipes ; Making conduits in situ, e.g. of concrete ; Casings, i.e. manhole shafts, access or inspection chambers or coverings of boreholes or narrow wells
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00Independent underground or underwater structures; Retaining walls
    • E02D29/16Arrangement or construction of joints in foundation structures
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/02Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
    • E02D31/025Draining membranes, sheets or fabric specially adapted therefor, e.g. with dimples
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D33/00Testing foundations or foundation structures

Abstract

The invention discloses a kind of urban track traffic cable run method for tunnel construction, include the following steps:Step S1, surveying setting-out;Step S2, pile driving construction is gone along with sb. to guard him;Step S3, bracing members are installed;Step S4, earth excavation;Step S5, floor structure is constructed:Tunnel structure is constructed using discrete method;Steel plate pile cutoff and bored concrete pile are continuously constructed, and the construction of bored concrete pile segment structure is carried out after pile cutoff is perfused and reaches intensity;Step S6, bracing members are removed;Step S7, treatment of construction joints;Step S8, side wall and top board structure construction;Step S9, side and top plate backfilling of earthwork.The present invention uses building enclosure steel sheet pile combination filling pile construction integration Base hole supporting technology, and fender post is squeezed into ground, it is made to be interconnected to constitute entirety, reduces construction cost, reduces environmental disruption, improves construction efficiency;By upper and lower twice bracing members, using I-steel and it is welded with elongated steel plate and batten plate and floor is joined into a stress entirety, improves the security and stability of support system.

Description

A kind of urban track traffic cable run method for tunnel construction
Technical field
The invention belongs to cable run technical field of construction, and in particular, to a kind of urban track traffic cable run tunnel Pipeline construction method.
Background technique
In recent years, as China's city size expands at double, infrastructure falls behind problem and shows, Urban Transportation contradiction It becomes increasingly conspicuous.Urban track traffic advantage safe with its, punctual, quick is widening city space, is making city quick stereo It plays a greater and greater role in terms of transportation network and improvement urban traffic environment.It is sent out according to urban sustainable development in each big city in the whole nation The needs that exhibition and urban transportation develop in a healthy way, all in positive planning construction urban rail traffic project, the defeated change of urban track traffic Electric line adheres to subway work feature, and occupancy aboveground space as few as possible mitigates the influence to urban development, this allows for ground The lower such a save space in cable tunnel, the preferable overhead cabling method of security performance are widely used, but constantly to underground Supporting is put forward higher requirements before cable tunnel construction is excavated in deeper inside construction.
Summary of the invention
The purpose of the present invention is to provide a kind of urban track traffic cable run method for tunnel construction, are gone along with sb. to guard him by setting Structural steel sheet pile combination filling pile construction integration Base hole supporting technology improves construction matter while ensuring safe construction Amount and efficiency.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of urban track traffic cable run method for tunnel construction, includes the following steps:
Step S1, surveying setting-out
1) measuring goes out to control stake on the working face of leveling;
2) measuring goes out the position of foundation pit enclosure pile center line, gutter;Stake is controlled according to three benchmark at scene, using warp Periphery measuring goes out the interim control stake of foundation pit enclosure stake at the scene for latitude instrument, total station, level;
3) need to be arranged interim control stake according to construction;
Step S2, pile driving construction is gone along with sb. to guard him
The pattern of pattern foundation pit supporting structure be respectively adopted for:
Steel sheet pile supporting:When excavation of foundation pit depth be less than or equal to 6.0m when, and periphery without building and away from road farther out Construction surface, twice steel shotcrete support is added using Lashen IV type steel sheet pile;
Cast-in-situ bored pile supporting:When foundation depth is greater than 6.0m or periphery is closer there are building or apart from road When, use diameter to add twice steel shotcrete support for the cast-in-situ bored pile of 0.6m;According to excavation of foundation pit depth, accordingly extend support pile Length guarantees that pile body anchors into base depth not less than 2.0m;
1) steel sheet pile construction
(1) it examines and correction steel sheet pile
Visual examination and material evaluation are carried out to the steel sheet pile marched into the arena;
(2) steel sheet pile is set
Using voluntarily oscillatory type steel sheet pile special-purpose machinery inserting piling, steel plate is broken after taking first pilot hole in region harder for soil property The method of stake;
2) bored pile construction
After drilling machine is in place, using pile driving construction is jumped, after concreting in 3 days, spud in outside 3 times of stake diameter ranges;It is boring Monitoring center position deviation during hole, drilling depth, bull stick verticality and oil pressure variation, encounter underground obstacle or collapse hole, When the aqueous condition of underground, stop drilling and promote drilling rod in time, after inspection processing, can continue operation;Drilling is completed, borehole cleaning terminates Afterwards, it is put into steel reinforcement cage, casting concrete in time;
Step S3, bracing members are installed:
According to earth excavation depth, twice are completed using ф 609x16/12 steel pipe bracing members in time and are set up;
Steel sheet pile:Longitudinal divisions excavation pit, at lower 0.5 meter of the designed elevation of cutting depth to first of bracing members When, first of bracing members is installed;When at lower 0.5 meter of the designed elevation of excavation pit depth to second bracing members, installation the Two bracing members;
Bored concrete pile:After bored concrete pile and crown beam concrete strength reach the 100% of design strength, longitudinal divisions excavation pit When to lower 0.5 meter of bottom elevation of hat, first of bracing members is installed;Longitudinal divisions excavation pit is designed to second bracing members and is marked When at 0.5 meter of relative superiority or inferiority, second bracing members are installed;First of bracing members is supported directly in crown beam, and second bracing members are in steel Purlin position;
Step S4, earth excavation
1) pit retaining monitoring
To foundation pit supporting system deformation, surrounding building, the deformation observation of important pipeline and foundation pit top before earth excavation Sedimentation, displacement, level of ground water project reasonable Arrangement monitoring point, real-time monitoring understand the stability state of foundation pit;
2) pit earthwork excavates
The building enclosure that cast-in-situ bored pile, steel sheet pile and bracing members are constituted in every layer of earth excavation completion, sets up bracing members Afterwards, it just can be carried out the excavation construction of subsoil side;During earth excavation, reinforce the statistical analysis of monitoring measurement, real-time monitoring The deformation displacement of supporting construction and the differential settlement of the soil body;
Step S5, floor structure is constructed:
Tunnel structure is constructed using discrete method;Steel plate pile cutoff and bored concrete pile are continuously constructed, and steel plate pile cutoff supporting construction is completed Earth excavation structure construction afterwards carries out the construction of bored concrete pile segment structure after pile cutoff is perfused and reaches intensity;
Step S6, bracing members are removed
1) bracing members dismounting first discharges bearing stress, unclamps movable end by root and removes disk;
2) steel sheet pile bracing members are removed and bored concrete pile is removed:It is removable after bottom plate and side wall concrete reach design strength 100% Except second bracing members, after in tunnel, main structure concrete strength reaches design strength 100%, dismountable first of steel branch Support;Bracing members extract steel sheet pile and examine ambient enviroment before steel sheet pile is extracted after removing, take corresponding measure, reduce to week The destruction in collarette border;The sequence of pile pulling is opposite with stake sequence is set;After pile body is extracted, stake holes is backfilled in time with graded sand and stone;It pulls out Except steel sheet pile is pulled out jointly using vibration hammer and crane;
Step S7, treatment of construction joints
Wall horizontal construction joint, which stays in, to be higher by wall of the backplate surface not less than 300mm;Horizontal construction joint pours coagulation Before soil, by its surface laitance and eliminating impurities, it is then laid with net slurry or painted concrete interface treating agent, cement-base infiltration crystallization The materials such as type water-repellent paint repave 30-50mm thick 1:1 cement mortar, and timely casting concrete;
Step S8, side wall and top board structure construction
Side wall and top plate carry out waterproof construction;
Step S9, side and top plate backfilling of earthwork
Backfill is tamped according to design requirement back-filling in layers;During earth filling tamping, filler answers placement in layers, layering to ram Real, every layer of compacting counting is 3~4 times, completes construction.
Further, steel sheet pile visual examination described in step S2 includes:Surface defect, length, width, height, thickness, The contents such as end squareness ratio, straightness and fore shaft shape, correct the steel sheet pile for not meeting shape need, to reduce piling Difficulty and pile position deviation;Steel sheet pile correction includes surface-defect repairing, end plane correction, pile body flexure and twist correcting, stake Body local deformation correction and fore shaft straightening.
Further, set described in step S2 steel sheet pile the specific steps are:Before setting stake, measurement and positioning unwrapping wire, stake It is in place by line insertion;When piling, start squeezing into position and direction and controlling precision for set first and second piece of steel sheet pile, every dozen It is primary to enter 1m measurement;The allowable error set is:Stake top absolute altitude deviation ± 100mm, steel sheet pile misalignment of axe ± 100mm, steel plate Pile verticality deviation is 1%;Whether within the allowable range above-mentioned deviation is monitored in time, timely correction when exceeding allowed band.
Further, borehole cleaning mode described in step S2 carries out borehole cleaning using flat double-door type scouring bit.
Further, first of bracing members erection described in step S3 is rest directly upon on first of waist rail beam, second Bracing members erection is placed in steel purlin;Steel purlin is welded using 20mmQ235 steel plate and common Two bors d's oeuveres work 45b fashioned iron, I-steel Using elongated steel plate and batten plate and floor is welded with, being allowed to connection becomes a stress entirety, and steel purlin is with being fixed on fender post Angle bar frame support, steel purlin, bracing members set up manually cooperation lifting appliance placed;Bracing members set up pre-add axis Power uses hydraulic jack;Support is outer assembled using foundation pit, and lifting appliance lifts by crane whole installation.
Further, pit retaining monitoring described in step S4 the specific steps are:
(1) ground settlement observation monitoring:Bury ground settlement point in the ground hardened outside foundation pit;With impact drill or spiral Drilling machine is 100~200mm in surface drilling diameter, depth to it is broken wear maturing until, then squeeze into grow 1000~ 1500mm, diameter 16mm screw thread round end reinforcing bar, surrounding are tamped with normal sand;The location arrangements 3 other than far from construction infection range A above firm height datum point, using above-mentioned firm height datum point as Fixed Initial Point, composition levelling network is joined ground settlement It surveys;
(2) bracing members axle power monitors:Bracing members are vertically welded in mounting rack on support fixed end when setting up, and when welding protects The center at the center and support of demonstrate,proving mounting rack point-blank, is then steadily placed in axle power meter in mounting rack;Using axis Power meter tests the axial compressive force of support;
(3) water level monitoring:When the outer water level hole of foundation pit is laid, after getting into design requirement depth using drilling machine, it is embedded in hole Drainage plastic bushing, caliber 50mm;The water surface is directly read to the depth of nozzle using water-level gauge, subtracts the water surface with the elevation of nozzle Depth determines water level elevation, to implement to monitor to level of ground water.
Further, discrete method described in step S5 construction the specific steps are:1) reinforced bar engineering:The overlap joint for binding connector is long Degree, joint style and joint location should meet design and regulatory requirements;2) installation of template and its bracket must be installed strictly and be applied Work technical solution carries out, and does not answer spillage at form joint;3) water-proof concrete preferably uses ready mixed concrete, enters to pump slump Control is in 120-160mm;Concrete should continuous placing, preferably stay construction joint less.
Further, the stress of support release described in step S6, which is used, is put into active end for 2 30 tons of hydraulic jacks, And guarantee that jack top power is consistent, the production brackets fixation of two jack is integral, connect after oil pipe can turn on pump apply Prestressing, prestress application in place after, in time by movable end gad block take out, remove connection after slowly put down.
Further, the specific method of waterproof construction is in step S8:Side wall and waterproof roofing concrete are by adjusting matching Composition and division in a proportion or Mixed With Admixture, admixture measure are formulated, and seepage-resistant grade cannot be less than P6;Structurally waterproof uses concrete knot The mode that structure self waterproofing is combined with waterproof roll;Buried rubber watertight strip in top plate and the use of wallboard deformation joint, 30mm Thick polyethylene low ratio foamed joint filling, 30*30 two-component polysulfide sealant filleting.
Beneficial effects of the present invention:
(1) present invention uses building enclosure steel sheet pile combination filling pile construction integration Base hole supporting technology, by fender post (pressure) is beaten with piling machine and enters ground, it is made to be interconnected to constitute entirety, reduces construction cost, reduces environmental disruption, improves construction Efficiency;
(2) present invention uses dispersive stress strong supporting, by upper and lower twice bracing members, while using I-steel and being welded with logical Long steel plate and batten plate and floor are allowed to be joined into a stress entirety, and the stress singly supported is avoided to concentrate, and improve support system Security and stability;
(3) present invention carries out planning in advance and reserves construction joint to the prior typesetting of progress of steel sheet pile construction position, before constructing really Scale cun control point and working procedure, and in strict accordance with working procedure fine-grained management, effectively control construction joint deviation;
(4) the present invention is based on the main structures that process is connected completely successively to construct, energy-efficient;
(5) tunnel main structure of the invention is constructed using discrete method, can effectively save the duration.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with embodiment, it is clear that described reality Applying example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is general Logical technical staff all other embodiment obtained without creative efforts belongs to what the present invention protected Range.
A kind of urban track traffic cable run method for tunnel construction, includes the following steps:
Step S1, surveying setting-out
1) measuring goes out to control stake on the working face of leveling.Coordinate and absolute altitude are controlled in the place provided according to design prospecting Position, measuring coordinate, high process control stake disk;
2) it is required according to construction drawing, measuring goes out the positions such as foundation pit enclosure pile center line, gutter;According to three bases at scene Quasi- control stake, using theodolite, total station, level etc., periphery measuring goes out the interim control stake of foundation pit enclosure stake at the scene;
3) need to be arranged interim control stake according to construction;
Step S2, pile driving construction is gone along with sb. to guard him
Integration engineering geology and hydrogeologic condition and economy etc., in conjunction with the factors such as excavation slope difficulty, base Hole supporting pattern be respectively adopted for:
Steel sheet pile supporting:According to design drawing, when excavation of foundation pit depth is less than or equal to 6.0m, and periphery without building and Away from the farther away construction surface of road, using Lashen IV type steel sheet pile+twice steel shotcrete support;
Cast-in-situ bored pile supporting:When foundation depth is greater than 6.0m or periphery is closer there are building or apart from road When, use diameter for the cast-in-situ bored pile of 0.6m+twice steel shotcrete support.According to excavation of foundation pit depth, accordingly extend support pile Length guarantees that pile body anchors into base depth not less than 2.0m;
1) steel sheet pile construction
(1) it examines and correction steel sheet pile
Visual examination and material evaluation are carried out to the steel sheet pile marched into the arena;Steel sheet pile visual examination includes:Surface defect, length The contents such as degree, width, height, thickness, end squareness ratio, straightness and fore shaft shape, to the steel sheet pile for not meeting shape need It is corrected, to reduce piling difficulty and pile position deviation;Steel sheet pile correction includes surface-defect repairing, end plane correction, stake Body flexure and twist correcting, pile body local deformation correction and fore shaft straightening etc.;
(2) steel sheet pile is set
Using voluntarily oscillatory type steel sheet pile special-purpose machinery inserting piling, steel plate is broken after taking first pilot hole in region harder for soil property The method of stake, specifically, measurement and positioning unwrapping wire, stake is inserted into place by line before setting stake;When piling, start first and second set Block steel sheet pile squeezes into position and direction and to control precision, and it is primary often to squeeze into 1m measurement;The allowable error set is:Stake top absolute altitude Deviation ± 100mm, steel sheet pile misalignment of axe ± 100mm, steel sheet pile perpendicularity deviation are 1%;Above-mentioned deviation is monitored in time whether Within the allowable range, timely correction when exceeding allowed band;
2) bored pile construction
After drilling machine is in place, using pile driving construction is jumped, after concreting in 3 days, spud in outside 3 times of stake diameter ranges;It is boring Monitoring center position deviation, drilling depth, bull stick verticality and oil pressure variation (corresponding to rock strength) etc., encounter during hole When the situations such as underground obstacle or collapse hole, underground water, stop drilling and promote drilling rod in time, after inspection processing, can continue to make Industry;Drilling is completed, after borehole cleaning, is put into steel reinforcement cage, casting concrete in time;Borehole cleaning mode uses flat double-door type borehole cleaning Drill bit carries out borehole cleaning;
Step S3, bracing members are installed:
2 framves are completed using ф 609x16/12 steel pipe bracing members in time according to earth excavation depth according to drawing requirement If;
Steel sheet pile:Longitudinal divisions excavation pit, at lower 0.5 meter of the designed elevation of cutting depth to first of bracing members When, first of bracing members is installed;When at lower 0.5 meter of the designed elevation of excavation pit depth to second bracing members, installation the Two bracing members;
First of bracing members erection is rest directly upon on first of waist rail beam, and the erection of second bracing members is placed in steel purlin On;Steel purlin is welded using 20mmQ235 steel plate and common Two bors d's oeuveres work 45b fashioned iron, and I-steel uses and is welded with elongated steel plate and batten plate And floor, being allowed to connection becomes a stress entirety, and steel purlin is supported with the angle bar frame being fixed on fender post, and steel encloses Purlin, bracing members set up manually cooperation lifting appliance and are placed;Bracing members set up brace pre axial force and use hydraulic jack;Support Whole installation is lifted by crane using assembly, lifting appliance outside foundation pit;
Bored concrete pile:After bored concrete pile and crown beam concrete strength reach the 100% of design strength, longitudinal divisions excavation pit When to lower 0.5 meter of bottom elevation of hat, first of bracing members is installed;Longitudinal divisions excavation pit is designed to second bracing members and is marked When at 0.5 meter of relative superiority or inferiority, second bracing members are installed;First of bracing members is supported directly in crown beam, and second bracing members are in steel Purlin position;
Step S4, earth excavation
1) pit retaining monitoring
According to design drawing and code requirement, to foundation pit supporting system deformation, periphery buildings or structures, again before earth excavation The projects reasonable Arrangement monitoring point such as sedimentation, displacement, level of ground water at the top of the deformation observation and foundation pit of pipeline is wanted, real-time monitoring understands The stability state of foundation pit;
(1) ground settlement observation monitoring:Bury ground settlement point in the ground hardened outside foundation pit;With impact drill or spiral Drilling machine is 100~200mm in surface drilling diameter, depth to it is broken wear maturing until, then squeeze into grow 1000~ 1500mm, diameter 16mm screw thread round end reinforcing bar, surrounding are tamped with normal sand;The location arrangements 3 other than far from construction infection range A above firm height datum point, using above-mentioned firm height datum point as Fixed Initial Point, composition levelling network is joined ground settlement It surveys;
(2) bracing members axle power monitors:Bracing members are vertically welded in mounting rack on support fixed end when setting up, and when welding protects The center at the center and support of demonstrate,proving mounting rack point-blank, is then steadily placed in axle power meter in mounting rack;Using axis Power meter tests the axial compressive force of support;
(3) water level monitoring:When the outer water level hole of foundation pit is laid, after getting into design requirement depth using drilling machine, it is embedded in hole Drainage plastic bushing, caliber 50mm;The water surface is directly read to the depth of nozzle using water-level gauge, subtracts the water surface with the elevation of nozzle Depth determines water level elevation, to implement to monitor to level of ground water;
2) pit earthwork excavates
Excavation of foundation pit follows the principle of " from top to bottom, first support and dig afterwards, stage excavation is forbidden to backbreak ", cast-in-situ bored pile, steel The building enclosure that sheet pile and bracing members are constituted just can be carried out subsoil side after every layer of earth excavation is completed, sets up bracing members Excavate construction;During earth excavation, reinforce the statistical analysis of monitoring measurement, the deformation displacement and soil of real-time monitoring supporting construction The differential settlement of body;
Step S5, floor structure is constructed:
Tunnel structure is constructed using discrete method, with the 35kV of the Hefei rail transit Line 2 110kV main transformer station system integration For cable tunnel, tunnel overall length 1.65km, cable tunnel locations of structures is in the greenbelt on town road side, surrounding structure Build that object is intensive, underground utilities are complex;17 active sections are completely divided according to construction condition, as shown in table 1 below;Steel plate Pile cutoff and bored concrete pile are continuously constructed, and earth excavation structure construction after the completion of steel plate pile cutoff supporting construction, pile cutoff to be perfused reaches strong The construction of bored concrete pile segment structure is carried out after degree;
1) reinforced bar engineering:The lap of splice, joint style and the joint location of binding connector should meet design and regulatory requirements;
2) the necessary stringent installation Technology scheme of the installation of template and its bracket carries out, and does not answer spillage at form joint;
3) water-proof concrete preferably uses ready mixed concrete, enters to pump slump control in 120-160mm;Concrete should Continuous placing preferably stays construction joint less;
Step S6, bracing members are removed
Bracing members dismounting first discharges bearing stress, unclamps movable end by root and removes disk;Support release stress is used 2 30 Ton hydraulic jack is put into active end, and guarantees that jack top power is consistent, and two jack production brackets are fixed into one It is whole, connect after oil pipe can turn on pump apply prestressing force, prestress application in place after, the gad block in movable end is taken in time Out, it is slowly put down after removing connection;
Steel sheet pile bracing members are removed:It is required according to design drawing, after bottom plate and side wall concrete reach design strength 100%, Dismountable second bracing members, after in tunnel, main structure concrete strength reaches design strength 100%, dismountable first of steel Support;Bracing members extract steel sheet pile and to examine ambient enviroment before steel sheet pile is extracted, take corresponding measure after removing, reduce Destruction to ambient enviroment;The sequence of pile pulling is generally opposite with stake sequence is set;After pile body is extracted, stake holes graded sand and stone is timely Backfill;Steel sheet pile is pulled out to pull out jointly using vibration hammer and crane;
Bored concrete pile support:It is removed with steel sheet pile bracing members consistent;
Step S7, treatment of construction joints
Wall horizontal construction joint should not stay in the junction of shearing maximum or bottom plate and side wall, stay in and be higher by backplate surface On wall not less than 300mm;Before horizontal construction joint casting concrete, then its surface laitance and eliminating impurities are laid with net The materials such as slurry or painted concrete interface treating agent, cement based penetration crystallization type water proofing paint repave 30-50mm thick 1:1 water Cement mortar, and timely casting concrete;
Step S8, side wall and top board structure construction
Side wall and waterproof roofing concrete are formulated by adjusting the measures such as match ratio or Mixed With Admixture, admixture, Its seepage-resistant grade cannot be less than P6;Structurally waterproof is using concrete structure self-waterproofing in such a way that waterproof roll combines;Top plate And buried rubber watertight strip in the use of wallboard deformation joint, 30mm thick polyethylene low ratio foamed joint filling, 30*30 two-component polysulfide are close Sealing filleting;
Step S9, side and top plate backfilling of earthwork
Backfill is tamped according to design requirement back-filling in layers;During earth filling tamping, filler answers placement in layers, layering to ram Real, every layer of compacting counting is 3~4 times, completes construction.
Present invention disclosed above preferred embodiment is only intended to help to illustrate the present invention.There is no detailed for preferred embodiment All details are described, are not limited the invention to the specific embodiments described.Obviously, according to the content of this specification, It can make many modifications and variations.These embodiments are chosen and specifically described to this specification, is in order to better explain the present invention Principle and practical application, so that skilled artisan be enable to better understand and utilize the present invention.The present invention is only It is limited by claims and its full scope and equivalent.

Claims (9)

1. a kind of urban track traffic cable run method for tunnel construction, which is characterized in that include the following steps:
Step S1, surveying setting-out
1) measuring goes out to control stake on the working face of leveling;
2) measuring goes out the position of foundation pit enclosure pile center line, gutter;Stake is controlled according to three benchmark at scene, using longitude and latitude Periphery measuring goes out the interim control stake of foundation pit enclosure stake at the scene for instrument, total station, level;
3) need to be arranged interim control stake according to construction;
Step S2, pile driving construction is gone along with sb. to guard him
The pattern of pattern foundation pit supporting structure be respectively adopted for:
Steel sheet pile supporting:When excavation of foundation pit depth is less than or equal to 6.0m, and periphery is applied without building and away from road is farther away Work face adds twice steel shotcrete support using Lashen IV type steel sheet pile;
Cast-in-situ bored pile supporting:When foundation depth is greater than 6.0m or when periphery is closer there are building or apart from road, adopt Add twice steel shotcrete support with the cast-in-situ bored pile that diameter is 0.6m;It is corresponding to extend supporting pile length according to excavation of foundation pit depth, Guarantee that pile body anchors into base depth not less than 2.0m;
1) steel sheet pile construction
(1) it examines and correction steel sheet pile
Visual examination and material evaluation are carried out to the steel sheet pile marched into the arena;
(2) steel sheet pile is set
Using voluntarily oscillatory type steel sheet pile special-purpose machinery inserting piling, steel sheet pile is beaten after taking first pilot hole in region harder for soil property Method;
2) bored pile construction
After drilling machine is in place, using pile driving construction is jumped, after concreting in 3 days, spud in outside 3 times of stake diameter ranges;It was drilling Monitoring center position deviation, drilling depth, bull stick verticality and oil pressure variation, encounter underground obstacle or collapse hole, underground in journey When aqueous condition, stop drilling and promote drilling rod in time, after inspection processing, can continue operation;Drilling is completed, after borehole cleaning, It is put into steel reinforcement cage, casting concrete in time;
Step S3, bracing members are installed:
According to earth excavation depth, twice are completed using ф 609x16/12 steel pipe bracing members in time and are set up;
Steel sheet pile:Longitudinal divisions excavation pit, when at lower 0.5 meter of the designed elevation of cutting depth to first of bracing members, peace Fill first of bracing members;When at lower 0.5 meter of the designed elevation of excavation pit depth to second bracing members, second steel is installed Support;
Bored concrete pile:After bored concrete pile and crown beam concrete strength reach the 100% of design strength, longitudinal divisions excavation pit to hat When at lower 0.5 meter of bottom elevation, first of bracing members is installed;Under longitudinal divisions excavation pit to second bracing members designed elevation When at 0.5 meter, second bracing members are installed;First of bracing members is supported directly in crown beam, and second bracing members are in steel purlin Position;
Step S4, earth excavation
1) pit retaining monitoring
Foundation pit supporting system deformation, surrounding building, the deformation observation of important pipeline and foundation pit top are settled before earth excavation, Displacement, level of ground water project reasonable Arrangement monitoring point, real-time monitoring understand the stability state of foundation pit;
2) pit earthwork excavates
The building enclosure that cast-in-situ bored pile, steel sheet pile and bracing members are constituted, after every layer of earth excavation is completed, sets up bracing members, It just can be carried out the excavation construction of subsoil side;During earth excavation, reinforce the statistical analysis of monitoring measurement, real-time monitoring supporting The deformation displacement of structure and the differential settlement of the soil body;
Step S5, floor structure is constructed:
Tunnel structure is constructed using discrete method;Steel plate pile cutoff and bored concrete pile are continuously constructed, soil after the completion of steel plate pile cutoff supporting construction Structure construction excavates in side, and the construction of bored concrete pile segment structure is carried out after pile cutoff is perfused and reaches intensity;
Step S6, bracing members are removed
1) bracing members dismounting first discharges bearing stress, unclamps movable end by root and removes disk;
2) steel sheet pile bracing members are removed and bored concrete pile is removed:After bottom plate and side wall concrete reach design strength 100%, dismountable Two bracing members, after in tunnel, main structure concrete strength reaches design strength 100%, dismountable first of bracing members;Steel Steel sheet pile is extracted after supporting removal and examines ambient enviroment before steel sheet pile is extracted, takes corresponding measure, is reduced to ring around The destruction in border;The sequence of pile pulling is opposite with stake sequence is set;After pile body is extracted, stake holes is backfilled in time with graded sand and stone;Pull out steel Sheet pile is pulled out jointly using vibration hammer and crane;
Step S7, treatment of construction joints
Wall horizontal construction joint, which stays in, to be higher by wall of the backplate surface not less than 300mm;Before horizontal construction joint casting concrete, By its surface laitance and eliminating impurities, then it is laid with net slurry or painted concrete interface treating agent, cement-base infiltration crystallization type is anti- The materials such as water paint repave 30-50mm thick 1:1 cement mortar, and timely casting concrete;
Step S8, side wall and top board structure construction
Side wall and top plate carry out waterproof construction;
Step S9, side and top plate backfilling of earthwork
Backfill is tamped according to design requirement back-filling in layers;During earth filling tamping, filler answers placement in layers, compaction in layers, often Layer compacting counting is 3~4 times, completes construction.
2. a kind of urban track traffic cable run method for tunnel construction according to claim 1, which is characterized in that step Steel sheet pile visual examination described in S2 includes:Surface defect, length, width, height, thickness, end squareness ratio, straightness and lock The contents such as mouth-shaped correct the steel sheet pile for not meeting shape need, to reduce piling difficulty and pile position deviation;Steel sheet pile Correction includes surface-defect repairing, end plane correction, pile body flexure and twist correcting, and pile body local deformation correction and fore shaft become Shape correction.
3. a kind of urban track traffic cable run method for tunnel construction according to claim 1, which is characterized in that step Set described in S2 steel sheet pile the specific steps are:Before setting stake, measurement and positioning unwrapping wire, stake is inserted into place by line;When piling, open The first and second piece of steel sheet pile set that begin squeezes into position and direction and to control precision, often squeezes into 1m measurement primary;The permission set Error is:Stake top absolute altitude deviation ± 100mm, steel sheet pile misalignment of axe ± 100mm, steel sheet pile perpendicularity deviation is 1%;Prison in time Whether within the allowable range to survey above-mentioned deviation, timely correction when exceeding allowed band.
4. a kind of urban track traffic cable run method for tunnel construction according to claim 1, which is characterized in that step Borehole cleaning mode described in S2 carries out borehole cleaning using flat double-door type scouring bit.
5. a kind of urban track traffic cable run method for tunnel construction according to claim 1, which is characterized in that step First of bracing members erection described in S3 is rest directly upon on first of waist rail beam, and the erection of second bracing members is placed in steel purlin On;Steel purlin is welded using 20mmQ235 steel plate and common Two bors d's oeuveres work 45b fashioned iron, and I-steel uses and is welded with elongated steel plate and batten plate And floor, being allowed to connection becomes a stress entirety, and steel purlin is supported with the angle bar frame being fixed on fender post, and steel encloses Purlin, bracing members set up manually cooperation lifting appliance and are placed;Bracing members set up brace pre axial force and use hydraulic jack;Support Whole installation is lifted by crane using assembly, lifting appliance outside foundation pit.
6. a kind of urban track traffic cable run method for tunnel construction according to claim 1, which is characterized in that step Pit retaining monitoring described in S4 the specific steps are:
(1) ground settlement observation monitoring:Bury ground settlement point in the ground hardened outside foundation pit;With impact drill or twist bit It is 100~200mm in surface drilling diameter, then depth squeezes into long 1000~1500mm, directly until breaking and wearing maturing Diameter 16mm screw thread round end reinforcing bar, surrounding are tamped with normal sand;Firm far from location arrangements 3 or more other than construction infection range Height datum point, for ground settlement using above-mentioned firm height datum point as Fixed Initial Point, composition levelling network carries out translocation;
(2) bracing members axle power monitors:Bracing members are vertically welded in mounting rack on support fixed end when setting up, and guarantee peace when welding The center at the center and support shelved point-blank, is then steadily placed in axle power meter in mounting rack;Using axle power meter To test the axial compressive force of support;
(3) water level monitoring:When the outer water level hole of foundation pit is laid, after getting into design requirement depth using drilling machine, drainage is embedded in hole Plastic bushing, caliber 50mm;The water surface is directly read to the depth of nozzle using water-level gauge, subtracts water surface depth with the elevation of nozzle Water level elevation is determined, to implement to monitor to level of ground water.
7. a kind of urban track traffic cable run method for tunnel construction according to claim 1, which is characterized in that step Discrete method described in S5 construction the specific steps are:1) reinforced bar engineering:Bind the lap of splice, joint style and the joint location of connector Design and regulatory requirements should be met;2) the necessary stringent installation Technology scheme of the installation of template and its bracket carries out, and template connects Spillage is not answered at seam;3) water-proof concrete preferably uses ready mixed concrete, enters to pump slump control in 120-160mm;Coagulation Soil should continuous placing, preferably stay construction joint less.
8. a kind of urban track traffic cable run method for tunnel construction according to claim 1, which is characterized in that step The stress of support release described in S6, which is used, is put into active end for 2 30 tons of hydraulic jacks, and guarantees that jack top power is consistent, The production brackets fixation of two jack is integral, connect after oil pipe can turn on pump apply prestressing force, prestress application arrives Behind position, the gad block in movable end is taken out in time, is slowly put down after removing connection.
9. a kind of urban track traffic cable run method for tunnel construction according to claim 1, which is characterized in that step The specific method of waterproof construction is in S8:Side wall and waterproof roofing concrete are by adjusting match ratio or Mixed With Admixture, blending Material measure is formulated, and seepage-resistant grade cannot be less than P6;Structurally waterproof uses concrete structure self-waterproofing and waterproof roll phase In conjunction with mode;Buried rubber watertight strip in top plate and the use of wallboard deformation joint, 30mm thick polyethylene low ratio foamed joint filling, 30*30 two-component polysulfide sealant filleting.
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