CN110258512A - It constructs in a kind of basement rock the method for diaphram wall - Google Patents
It constructs in a kind of basement rock the method for diaphram wall Download PDFInfo
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- CN110258512A CN110258512A CN201910453526.8A CN201910453526A CN110258512A CN 110258512 A CN110258512 A CN 110258512A CN 201910453526 A CN201910453526 A CN 201910453526A CN 110258512 A CN110258512 A CN 110258512A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
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Abstract
The invention discloses a kind of methods for diaphram wall of constructing in basement rock, specifically includes the following steps: S1, measurement prepare: the horizontal control point provided according to owner, to the planar conductor line of laying one closure of foundation pit periphery, in the work progress of diaphram wall, axis cultellation uses method of polar coordinates, according to foundation pit peripheral closure conducting wire and datum mark, launch each main shaft control point, then go out each axis with total station pilot measurement, in work progress, repetition measurement is periodically carried out to conducting wire, axial reference control point, the present invention relates to technical field of building construction.The method of construction diaphram wall in the basement rock, by using the combination trench machine being made of rotary drilling rig and impact holing drilling machine, effectively solve the problems, such as that the chute forming machine of normal construction in basement rock can not construct, accelerate construction speed, improve construction efficiency, it avoids being easy to produce a large amount of sediments when subsequent placement steel reinforcement cage, integrated operation is more convenient, and integrated operation efficiency is higher.
Description
Technical field
The present invention relates to technical field of building construction, the method for construction diaphram wall in specially a kind of basement rock.
Background technique
For diaphram wall excavation technology originating from Europe, it is to use mud and underwater pouring according to well-digging and oil drilling
The method of concrete and grow up, diaphram wall is that foundation engineering uses a kind of trench machine on the ground, along depth
The periphery axis of excavation project excavates out a long and narrow deep trouth under the conditions of mud off, and after clear slot, steel is hung in slot
Then muscle cage builds up a unit groove section with tremie method underwater concreting with tremie method, so carry out paragraph by paragraph, build up in underground and connect together
Continuous armored concrete wall, as intercept water, antiseepage, load-bearing, water-retaining structure, this law feature is: Construction Vibration is small, wall stiffness
Greatly, good integrity, speed of application is fast, can save the cubic metre of earth and stone, can be used in intensive building building deep foundation pit support and carries out inverse make
Method construction, can be used under various geological conditions, including construction etc. in sandy soil layer, partial size 50mm sandy gravel stratum below, be suitable for
Basement, market place builet below the ground, parking lot, oil cellar, retaining wall, the deep foundation of skyscraper, the contrary sequence method of construction of buildings are applied
Work building enclosure, deep pond, hole and vertical shaft of industrial building etc..
Existing diaphragm wall is when being constructed, and when bottom is basement rock, bucket tooth can not be inserted into it by being self-possessed by grab bucket
In, it is just unable to complete the movement that closure grabs soil, therefore in harder stratum, hydraulic grab is unable to complete drilling construction, and
Comprehensively grooving cannot be cleared up in work progress, cause to be easy to produce a large amount of sediments when subsequent placement steel reinforcement cage,
Integrated operation is more inconvenient, and integrated operation efficiency is lower.
Summary of the invention
(1) the technical issues of solving
In view of the deficiencies of the prior art, it the present invention provides a kind of method for diaphram wall of constructing in basement rock, solves
When bottom is basement rock, bucket tooth can not be inserted by grab bucket by being self-possessed, and just be unable to complete the movement that closure grabs soil, therefore harder
Stratum in, hydraulic grab is unable to complete drilling construction, and cannot comprehensively clear up grooving in work progress, causes
A large amount of sediments are easy to produce when subsequent placement steel reinforcement cage, integrated operation is more inconvenient, the lower problem of integrated operation efficiency.
(2) technical solution
In order to achieve the above object, the present invention is achieved by the following technical programs: continuous under construction ground in a kind of basement rock
The method of wall, specifically includes the following steps:
S1, measurement prepare: the horizontal control point provided according to owner is led to the plane of laying one closure of foundation pit periphery
Line, in the work progress of diaphram wall, axis cultellation uses method of polar coordinates, according to foundation pit peripheral closure conducting wire and benchmark
Point launches each main shaft control point, then goes out each axis with total station pilot measurement, in work progress, to conducting wire, axial reference control
System periodically carries out repetition measurement, and especially in foundation pit periphery, datum mark may be because diaphragm wall displacement and walk about, cut the earth end and bottom
Plate, which pours, to be finished, it is necessary to be checked according to the origin that owner provides peripheral closure conducting wire, axial reference control point, be adjusted
It is whole, and axial line control test point is laid in base surface；
S2, construction of guide wall: leading wall is to guarantee therefore the most important condition of diaphragm wall precision carries out technology before the construction line-putting
It tells somebody what one's real intentions are, it is stringent to check, guarantee that line setting is accurate, leads when wall performs and relax 50mm, be to guarantee grab bucket, drill bit, steel reinforcement cage
And the disengaging of fore shaft case is more smooth, to guarantee diaphragm wall because of grooving precision and not invading station architecture boundary, guarantees simultaneously
Diaphragm wall central axes are deviated 100mm in unwrapping wire by inwall structural thickness outward, lead wall 140mm above ground level suitable for reading, to prevent
Only rubbish and rainwater pour pollution or dilution mud in guide groove, when leading wall and excavating top, if outside upper body be able to maintain it is vertical from
Immediately, then exterior sheathing is replaced with upper wall, avoided in backfill, otherwise outside sets template, and after concrete strength reaches design requirement, wall back is used
It is stained with and rams packing reality, prevent surface water from penetrating into slot, slot section is caused to be caved in, after the completion of construction of guide wall, spread 40mm thickness in slot bottom
50# cement mortar can be used as temporarily to store up slurry before slot section is not excavated or change slurry ditch；
The production of S3, steel reinforcement cage: steel reinforcement cage integral manufacturing, integral lifting, longitudinal reinforcement uses butt welding when steel reinforcement cage is processed
Or mechanical connection, transverse steel are connect using spot welding with longitudinal reinforcement, girder rib uses single welding, and length is not less than 10d, connector
Position will mutually stagger, and welding point percentage is not greater than 50% in same jointing, and vertically and horizontally girder rib intersection needs
Spot welding, intersection point needs whole spot welding within the scope of steel reinforcement cage surrounding 0.5m, and overlap joint dislocation and joint test should meet armored concrete rule
Model requirement, reinforcing bar guarantee straight, and clean surface is without greasy dirt, internal 50% spot welding of intersection point, on steel reinforcement cage truss and steel reinforcement cage suspension centre
100% spot welding is needed at lower 1m；
The preparation of S4, mud: brand-new mud match ratio is adjusted according to actual situations of construction, and general relative density is
1.06t/m3, due to the variation of material properties, the mud of every batch of brand-new will be to its performance, such as viscosity, relative density, pH value, glue
Body etc. is tested, and the mud for meeting technical requirements just allows using mud is sent into new stock tank by slurry mixer, then by newly starching
Pond flows into circulation stock tank and is put into circulatory pool in new stock tank after static 24 hours, box cut section is sent into from circulatory pool, from slot section
In the mud that cements out flow into sedimentation basin and carry out gravity precipitating it is clear to take surface away with water pump after gravity precipitates 16 hours stabilizations
Dilute part pulp-water exhausts waste residue to circulatory pool, and by four layers of strainer filtering, remaining slurry regeneration recycling, waste pulp
Designated place is thrown aside by slurry transport truck；
S5, trenching construction: the guide hole of subdrilling diameter 800 before cell wall machine grooving is drilled into scar absolute altitude from ground with drilling machine, bores
After complete guide hole, grooving is carried out with cell wall machine, has vertical minimum display device then to carry out on cell wall machine when deviation is greater than 1/500
Rectification work, grab bucket working width 2.7m, and the control length of opening of the pre-buried I-shaped steel tank section of diaphragm wall is 7.0 meters, a standard cell section
Needing three width to grab could complete, and when passing through layer of sand, grooving speed should not be too fast, to harder middle decomposed rock and micro- decomposed rock, grab
Bucket lip cutting is motionless, need to carry out boring or jet-bedding, unit groove section grooving are flushed to another-end, every punching from one end in a slot section plane
One layer of rock of 0.5m thickness is once sunk clearly with cell wall machine and is cut, and target efficiency can be improved in this way, and jet-bedding extremely designs 0.1m under the absolute altitude of bottom,
With being interchangeable slurry after the clear complete heavy quarrel of cell wall machine grab bucket, using rotary drilling rig along construction of guide wall circular hole, then again with band rectangle hammer
Percussive drill basement rock remaining between circular hole is punched out construction, it is heavy to be then purged bottom hole using method of air lifting reverse circulation
Slag obtains construction of diaphragm wall slot section；
S6, grooving cleaning: natural sedimentation also is being carried out simultaneously in brush wall process bracket groove section, is starting clear bottom after wall to be brushed
Work occurs until plummet touches real feeling, shows the cleaning of slot bottom sediment in place, after the completion of steel reinforcement cage decentralization, concreting
Before, slot bottom sediment is detected using plummet again, if slot bottom sediment exceeds 10cm, using direct circulation conveying newly starch into
Slot, control flume bottom sediment be less than 10cm, for improve joint impervious and shear behavior, to leading width wall at continuous wall connector
Body seam carries out brush wall cleaning, and brush wall swipes at least 8 times repeatedly up and down, until on brush wall device without mud after, continue using brush
Wall device butt joint brush wall 2-3 times, thoroughly brush connector sediment, brush wall tool uses special brush wall device, brush wall must borehole cleaning it
Preceding progress；
S7, steel reinforcement cage are hung: horizontal hanging beam or hanger are applied in the lifting of steel reinforcement cage, and suspension centre arrangement and lifting method will prevent
Steel reinforcement cage is caused to deform when hanging, when lifting cannot be such that steel reinforcement cage lower end tows on the ground, to prevent causing lower end bar bending to become
Shape should be fastened in steel reinforcement cage lower end to be swung after preventing steel reinforcement cage from slinging in the sky and drag messenger with human control, be inserted into steel reinforcement cage
When, it is most important that make steel reinforcement cage aligned units slot section, in vertical and accurate insertion groove, when steel reinforcement cage is entered in slot, hangs
Dot center must alignment slot section center, then decline slowly, must be noted that at this time should not be because of lifting arm swing or due to other influences
So that steel reinforcement cage is generated horizontal swing, causes landslip of the sides of the trench；
S8, filling concrete: being carried out using tremie method by underwater gliders method, but is being started that coagulation is perfused with conduit
To prevent mud to be mixed into concrete before soil, a pipe close can be hung in conduit, will manage interior mud by the concrete pressure poured into
It squeezing out, concrete wants continuous pouring and measures filling concrete amount and lifting height, and the mud overflowed sends mud-settling pit back to,
When using two catheter perfusions simultaneously in same slot section, its spacing should not exceed 3m, and conduit is not preferably greater than away from slot section connector
1.5m, when starting perfusion, conduit bottom end is not preferably greater than 500mm away from slot bottom, and concrete surface should uniformly rise, the coagulation at each conduit
The height difference on native surface is not preferably greater than 0.5m, and concrete must be perfused before final set and finish；
S9, the processing of wall section connector: diaphram wall is formed by many wall section spelling groups, to keep continuously applying between wall section
Work, connector use locking notch pipe technique, i.e., before slot section concrete is perfused, in the end of slot section, a pre-inserted diameter and groove width are equal
Steel pipe, i.e. steel pipe is extracted slowly after concrete initial set, so that end is formed half blind mortise shape and connect shape by locking notch pipe, also with good grounds
Wall body structure stress needs and rigid joint is arranged, so that first latter two wall section unifies.
Preferably, twice support up and down is set every 2 meter amperes after demoulding in the S2, supports use >=80mm diameter round log
With [10 channel steel supports, while forbidding heavy-duty machinery before concrete is not up to design strength close to wall walking is led, it prevents from leading wall change
Shape.
It preferably, is the thickness for guaranteeing protective layer in the S3, horizontal direction sets 2-3 column locating pad on steel reinforcement cage width
Block, the vertical spacing of each column cushion block are arranged by 3m.
Preferably, jet-bedding is constructed using domestic ZP-3 percussive drill in the S5, is equipped with rectangular block stamp, block stamp planar dimension
For 0.76mX1.2m, integral cast steel, weight selects weight under the limitation of drilling machine traction function as far as possible.
Preferably, if steel reinforcement cage smoothly in insertion groove, cannot hang out immediately, find the cause and solve in the S7,
It hangs, cannot insert by force again after repairing slot if necessary, steel reinforcement cage otherwise can be caused to deform or make landslip of the sides of the trench, generate
A large amount of sediments.
Preferably, filling concrete uses concreting in water in the S8, and conduit selects the round screw thread of D=250 quick
Conduit is hung groove inlet section specified position with concreting frame, installs square-shaped hopper at the top of conduit by joint categories, concrete surface
The rate of climb is no less than 2.0m/h, and depth is preferably 2-6m in conduit Transducers Embedded in Concrete, and slump is tested before concreting
Degree, concrete test block is carried out in casting process: when construction of diaphragm wall, each unit groove section concrete should make pressure resistance
1 group of test specimen of degree, every 5 slot sections should make 1 group of impermeability pressure test specimen, and make a record.
(3) beneficial effect
The present invention provides a kind of methods for diaphram wall of constructing in basement rock.Have compared with prior art following beneficial
Effect: the method for diaphram wall of constructing in the basement rock, specifically includes the following steps: S1, measurement prepare, S2, construction of guide wall,
The production of S3, steel reinforcement cage, the preparation of S4, mud, S5, trenching construction, S6, grooving cleaning, S7, steel reinforcement cage are hung, S8, concrete
Perfusion, S9, the processing of wall section connector, by using the combination trench machine being made of rotary drilling rig and impact holing drilling machine, effectively
It solves the problems, such as that the chute forming machine of normal construction in basement rock can not construct, accelerates construction speed, improve construction efficiency, after avoiding
A large amount of sediments are easy to produce when continuous placement steel reinforcement cage, integrated operation is more convenient, and integrated operation efficiency is higher.
Specific embodiment
It is clearly and completely described below in conjunction with the technical solution in the embodiment of the present invention, 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 every other embodiment obtained without making creative work belongs to what the present invention protected
Range.
The embodiment of the present invention provides a kind of technical solution: a kind of method for diaphram wall of constructing in basement rock specifically includes
Following steps:
S1, measurement prepare: the horizontal control point provided according to owner is led to the plane of laying one closure of foundation pit periphery
Line, in the work progress of diaphram wall, axis cultellation uses method of polar coordinates, according to foundation pit peripheral closure conducting wire and benchmark
Point launches each main shaft control point, then goes out each axis with total station pilot measurement, in work progress, to conducting wire, axial reference control
System periodically carries out repetition measurement, and especially in foundation pit periphery, datum mark may be because diaphragm wall displacement and walk about, cut the earth end and bottom
Plate, which pours, to be finished, it is necessary to be checked according to the origin that owner provides peripheral closure conducting wire, axial reference control point, be adjusted
It is whole, and axial line control test point is laid in base surface；
S2, construction of guide wall: leading wall is to guarantee therefore the most important condition of diaphragm wall precision carries out technology before the construction line-putting
It tells somebody what one's real intentions are, it is stringent to check, guarantee that line setting is accurate, leads when wall performs and relax 50mm, be to guarantee grab bucket, drill bit, steel reinforcement cage
And the disengaging of fore shaft case is more smooth, to guarantee diaphragm wall because of grooving precision and not invading station architecture boundary, guarantees simultaneously
Diaphragm wall central axes are deviated 100mm in unwrapping wire by inwall structural thickness outward, lead wall 140mm above ground level suitable for reading, to prevent
Only rubbish and rainwater pour pollution or dilution mud in guide groove, when leading wall and excavating top, if outside upper body be able to maintain it is vertical from
Immediately, then exterior sheathing is replaced with upper wall, avoided in backfill, otherwise outside sets template, and after concrete strength reaches design requirement, wall back is used
It is stained with and rams packing reality, prevent surface water from penetrating into slot, slot section is caused to be caved in, after the completion of construction of guide wall, spread 40mm thickness in slot bottom
50# cement mortar can be used as temporarily to store up slurry before slot section is not excavated or change slurry ditch；
The production of S3, steel reinforcement cage: steel reinforcement cage integral manufacturing, integral lifting, longitudinal reinforcement uses butt welding when steel reinforcement cage is processed
Or mechanical connection, transverse steel are connect using spot welding with longitudinal reinforcement, girder rib uses single welding, and length is not less than 10d, connector
Position will mutually stagger, and welding point percentage is not greater than 50% in same jointing, and vertically and horizontally girder rib intersection needs
Spot welding, intersection point needs whole spot welding within the scope of steel reinforcement cage surrounding 0.5m, and overlap joint dislocation and joint test should meet armored concrete rule
Model requirement, reinforcing bar guarantee straight, and clean surface is without greasy dirt, internal 50% spot welding of intersection point, on steel reinforcement cage truss and steel reinforcement cage suspension centre
100% spot welding is needed at lower 1m；
The preparation of S4, mud: brand-new mud match ratio is adjusted according to actual situations of construction, and general relative density is
1.06t/m3, due to the variation of material properties, the mud of every batch of brand-new will be to its performance, such as viscosity, relative density, pH value, glue
Body etc. is tested, and the mud for meeting technical requirements just allows using mud is sent into new stock tank by slurry mixer, then by newly starching
Pond flows into circulation stock tank and is put into circulatory pool in new stock tank after static 24 hours, box cut section is sent into from circulatory pool, from slot section
In the mud that cements out flow into sedimentation basin and carry out gravity precipitating it is clear to take surface away with water pump after gravity precipitates 16 hours stabilizations
Dilute part pulp-water exhausts waste residue to circulatory pool, and by four layers of strainer filtering, remaining slurry regeneration recycling, waste pulp
Designated place is thrown aside by slurry transport truck；
S5, trenching construction: the guide hole of subdrilling diameter 800 before cell wall machine grooving is drilled into scar absolute altitude from ground with drilling machine, bores
After complete guide hole, grooving is carried out with cell wall machine, has vertical minimum display device then to carry out on cell wall machine when deviation is greater than 1/500
Rectification work, grab bucket working width 2.7m, and the control length of opening of the pre-buried I-shaped steel tank section of diaphragm wall is 7.0 meters, a standard cell section
Needing three width to grab could complete, and when passing through layer of sand, grooving speed should not be too fast, to harder middle decomposed rock and micro- decomposed rock, grab
Bucket lip cutting is motionless, need to carry out boring or jet-bedding, unit groove section grooving are flushed to another-end, every punching from one end in a slot section plane
One layer of rock of 0.5m thickness is once sunk clearly with cell wall machine and is cut, and target efficiency can be improved in this way, and jet-bedding extremely designs 0.1m under the absolute altitude of bottom,
With being interchangeable slurry after the clear complete heavy quarrel of cell wall machine grab bucket, using rotary drilling rig along construction of guide wall circular hole, then again with band rectangle hammer
Percussive drill basement rock remaining between circular hole is punched out construction, it is heavy to be then purged bottom hole using method of air lifting reverse circulation
Slag obtains construction of diaphragm wall slot section；
S6, grooving cleaning: natural sedimentation also is being carried out simultaneously in brush wall process bracket groove section, is starting clear bottom after wall to be brushed
Work occurs until plummet touches real feeling, shows the cleaning of slot bottom sediment in place, after the completion of steel reinforcement cage decentralization, concreting
Before, slot bottom sediment is detected using plummet again, if slot bottom sediment exceeds 10cm, using direct circulation conveying newly starch into
Slot, control flume bottom sediment be less than 10cm, for improve joint impervious and shear behavior, to leading width wall at continuous wall connector
Body seam carries out brush wall cleaning, and brush wall swipes at least 8 times repeatedly up and down, until on brush wall device without mud after, continue using brush
Wall device butt joint brush wall 2-3 times, thoroughly brush connector sediment, brush wall tool uses special brush wall device, brush wall must borehole cleaning it
Preceding progress；
S7, steel reinforcement cage are hung: horizontal hanging beam or hanger are applied in the lifting of steel reinforcement cage, and suspension centre arrangement and lifting method will prevent
Steel reinforcement cage is caused to deform when hanging, when lifting cannot be such that steel reinforcement cage lower end tows on the ground, to prevent causing lower end bar bending to become
Shape should be fastened in steel reinforcement cage lower end to be swung after preventing steel reinforcement cage from slinging in the sky and drag messenger with human control, be inserted into steel reinforcement cage
When, it is most important that make steel reinforcement cage aligned units slot section, in vertical and accurate insertion groove, when steel reinforcement cage is entered in slot, hangs
Dot center must alignment slot section center, then decline slowly, must be noted that at this time should not be because of lifting arm swing or due to other influences
So that steel reinforcement cage is generated horizontal swing, causes landslip of the sides of the trench；
S8, filling concrete: being carried out using tremie method by underwater gliders method, but is being started that coagulation is perfused with conduit
To prevent mud to be mixed into concrete before soil, a pipe close can be hung in conduit, will manage interior mud by the concrete pressure poured into
It squeezing out, concrete wants continuous pouring and measures filling concrete amount and lifting height, and the mud overflowed sends mud-settling pit back to,
When using two catheter perfusions simultaneously in same slot section, its spacing should not exceed 3m, and conduit is not preferably greater than away from slot section connector
1.5m, when starting perfusion, conduit bottom end is not preferably greater than 500mm away from slot bottom, and concrete surface should uniformly rise, the coagulation at each conduit
The height difference on native surface is not preferably greater than 0.5m, and concrete must be perfused before final set and finish；
S9, the processing of wall section connector: diaphram wall is formed by many wall section spelling groups, to keep continuously applying between wall section
Work, connector use locking notch pipe technique, i.e., before slot section concrete is perfused, in the end of slot section, a pre-inserted diameter and groove width are equal
Steel pipe, i.e. steel pipe is extracted slowly after concrete initial set, so that end is formed half blind mortise shape and connect shape by locking notch pipe, also with good grounds
Wall body structure stress needs and rigid joint is arranged, so that first latter two wall section unifies.
In the present invention, in S2 after demoulding every 2 meter amperes set up and down twice support, support use >=80mm diameter round log with
[10 channel steel supports, while forbidding heavy-duty machinery before concrete is not up to design strength close to wall walking is led, it prevents from leading wall deformation.
It is the thickness for guaranteeing protective layer in S3, horizontal direction sets 2-3 column locating pad on steel reinforcement cage width in the present invention
Block, the vertical spacing of each column cushion block are arranged by 3m.
In the present invention, jet-bedding is constructed using domestic ZP-3 percussive drill in S5, is equipped with rectangular block stamp, block stamp planar dimension is
0.76mX1.2m, integral cast steel, weight select weight under the limitation of drilling machine traction function as far as possible.
In the present invention, if steel reinforcement cage smoothly in insertion groove, cannot hang out immediately, find the cause and solve, such as in S7
Fruit needs then to hang again after repairing slot, cannot insert by force, and steel reinforcement cage otherwise can be caused to deform or make landslip of the sides of the trench, generates big
Measure sediment.
In the present invention, filling concrete uses concreting in water in S8, and conduit selects the fast quick access of round screw thread of D=250
Conduit is hung groove inlet section specified position with concreting frame by head type, installs square-shaped hopper at the top of conduit, concrete surface it is upper
Lifting speed is no less than 2.0m/h, and depth is preferably 2-6m in conduit Transducers Embedded in Concrete, and the slump is tested before concreting,
Concrete test block is carried out in casting process: when construction of diaphragm wall, each unit groove section concrete should make compression strength
1 group of test specimen, every 5 slot sections should make 1 group of impermeability pressure test specimen, and make a record.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (6)
1. a kind of method for diaphram wall of constructing in basement rock, it is characterised in that: specifically includes the following steps:
S1, measurement prepare: the horizontal control point provided according to owner, the planar conductor line being closed to laying one of foundation pit periphery,
In the work progress of diaphram wall, axis cultellation uses method of polar coordinates, according to foundation pit peripheral closure conducting wire and datum mark, throws
Each main shaft control point is put, then goes out each axis with total station pilot measurement, in work progress, to conducting wire, axial reference control point
Repetition measurement is periodically carried out, especially datum mark may be because diaphragm wall displacement and walk about that shoveling terminates and bottom plate pours in foundation pit periphery
It builds and finishes, it is necessary to peripheral closure conducting wire, axial reference control point are checked according to the origin that owner provides, adjusted,
And axial line control test point is laid in base surface；
S2, construction of guide wall: leading wall is to guarantee therefore the most important condition of diaphragm wall precision is carried out before the construction line-putting and confided a technological secret,
Stringent review guarantees that line setting is accurate, leads when wall performs and relax 50mm, be to guarantee grab bucket, drill bit, steel reinforcement cage and fore shaft
Case disengaging is more smooth, to guarantee diaphragm wall because of grooving precision and not invading station architecture boundary, while guaranteeing inwall
Diaphragm wall central axes are deviated 100mm in unwrapping wire by structural thickness outward, wall 140mm above ground level suitable for reading are led, to prevent rubbish
It is poured in guide groove with rainwater and pollutes or dilute mud, when leading wall excavation top, if outside upper body is able to maintain vertical stand-up,
With upper wall replace exterior sheathing, avoid in backfill, otherwise outside set template, after concrete strength reaches design requirement, wall back be stained with rammer
Packing is real, prevents surface water from penetrating into slot, and slot section is caused to be caved in, and after the completion of construction of guide wall, spreads 40mm thickness 50# cement in slot bottom
Mortar can be used as temporarily to store up slurry before slot section is not excavated or change slurry ditch；
The production of S3, steel reinforcement cage: steel reinforcement cage integral manufacturing, integral lifting, longitudinal reinforcement uses butt welding or machine when steel reinforcement cage is processed
Tool connection, transverse steel are connect using spot welding with longitudinal reinforcement, and girder rib uses single welding, and length is not less than 10d, joint location
It mutually staggering, welding point percentage is not greater than 50% in same jointing, and vertically and horizontally girder rib intersection needs spot welding,
Intersection point needs whole spot welding within the scope of steel reinforcement cage surrounding 0.5m, and overlap joint dislocation and joint test should meet armored concrete specification and want
It asks, reinforcing bar guarantee is straight, and clean surface is without greasy dirt, internal 50% spot welding of intersection point, steel reinforcement cage truss and the upper and lower 1m of steel reinforcement cage suspension centre
Place needs 100% spot welding；
The preparation of S4, mud: brand-new mud match ratio is adjusted according to actual situations of construction, and general relative density is 1.06t/
M3, due to the variation of material properties, the mud of every batch of brand-new will to its performance, such as viscosity, relative density, pH value, colloid into
Row test, the mud for meeting technical requirements just allow using mud is sent into new stock tank by slurry mixer, then is flowed by new stock tank
Circulation stock tank is put into circulatory pool in new stock tank after static 24 hours, is sent into box cut section from circulatory pool, replaces from slot section
Mud out flows into sedimentation basin progress gravity precipitating and takes the thin part in surface away with water pump after gravity precipitates 16 hours stabilizations
Pulp-water exhausts waste residue to circulatory pool, and by four layers of strainer filtering, and remaining slurry regeneration recycling, waste pulp are by mud
Transport vehicle throws aside designated place；
S5, trenching construction: the guide hole of subdrilling diameter 800 before cell wall machine grooving is drilled into scar absolute altitude from ground with drilling machine, is drilled and leads
Kong Hou carries out grooving with cell wall machine, has vertical minimum display device then to rectify a deviation on cell wall machine when deviation is greater than 1/500
Work, grab bucket working width 2.7m, and the control length of opening of the pre-buried I-shaped steel tank section of diaphragm wall is 7.0 meters, and a standard cell section needs
Three width, which are grabbed, to be completed, and when passing through layer of sand, grooving speed should not be too fast, to harder middle decomposed rock and micro- decomposed rock, sword of grabbing bucket
It cuts motionless, need to carry out boring or jet-bedding, unit groove section grooving are flushed to another-end from one end in a slot section plane, it is every to rush 0.5m
One layer of thick rock is once sunk clearly with cell wall machine and is cut, and target efficiency can be improved in this way, and 0.1m under jet-bedding to design bottom absolute altitude uses slot
After the clear complete heavy quarrel of wall machine grab bucket then i.e. interchangeable slurry is rushed with what is hammered into shape with rectangle again using rotary drilling rig along construction of guide wall circular hole
It hits drilling machine and basement rock remaining between circular hole is punched out construction, bottom hole sediment is then purged using method of air lifting reverse circulation,
Obtain construction of diaphragm wall slot section；
S6, grooving cleaning: natural sedimentation also is being carried out simultaneously in brush wall process bracket groove section, is starting clear basic skill or training after wall to be brushed
Make, occur until plummet touches real feeling, show the cleaning of slot bottom sediment in place, after the completion of steel reinforcement cage decentralization, concreting it
Before, slot bottom sediment is detected using plummet again, if slot bottom sediment exceeds 10cm, using direct circulation conveying newly starch into
Slot, control flume bottom sediment be less than 10cm, for improve joint impervious and shear behavior, to leading width wall at continuous wall connector
Body seam carries out brush wall cleaning, and brush wall swipes at least 8 times repeatedly up and down, until on brush wall device without mud after, continue using brush
Wall device butt joint brush wall 2-3 times, thoroughly brush connector sediment, brush wall tool uses special brush wall device, brush wall must borehole cleaning it
Preceding progress；
S7, steel reinforcement cage are hung: horizontal hanging beam or hanger are applied in the lifting of steel reinforcement cage, when suspension centre arrangement and lifting method will prevent lifting
Steel reinforcement cage is caused to deform, when lifting cannot be such that steel reinforcement cage lower end tows on the ground, to prevent causing lower end bar bending to deform, be
It is swung in the sky after preventing steel reinforcement cage from slinging, should be fastened in steel reinforcement cage lower end and drag messenger with human control, when being inserted into steel reinforcement cage, most
It is important that make steel reinforcement cage aligned units slot section, in vertical and accurate insertion groove, and when steel reinforcement cage is entered in slot, suspension centre center
Necessary alignment slot section center, then declines slowly, must be noted that not make reinforcing bar because of lifting arm swing or other influences at this time
Cage generates horizontal swing, causes landslip of the sides of the trench；
S8, filling concrete: it is carried out using tremie method by underwater gliders method, but before starting concrete perfusion with conduit
To prevent mud to be mixed into concrete, a pipe close can be hung in conduit, will be managed interior mud by the concrete pressure poured into and be squeezed out,
Concrete wants continuous pouring and measures filling concrete amount and lifting height, and the mud overflowed sends mud-settling pit back to, same
When using two catheter perfusions in one slot section simultaneously, its spacing should not exceed 3m, and conduit is not preferably greater than 1.5m away from slot section connector, opens
When beginning to be perfused, conduit bottom end is not preferably greater than 500mm away from slot bottom, and concrete surface should not rise uniformly, the concrete surface at each conduit
Height difference be not preferably greater than 0.5m, concrete must be perfused before final set and finish；
S9, the processing of wall section connector: diaphram wall is formed by many wall section spelling groups, to keep continuously constructing between wall section, is connect
Head uses locking notch pipe technique, i.e., before slot section concrete is perfused, a pre-inserted diameter and the equal steel of groove width in the end of slot section
Pipe, i.e. locking notch pipe extract steel pipe after concrete initial set slowly, so that end is formed half blind mortise shape and connect shape, also with good grounds wall
Structure stress needs and rigid joint is arranged, so that first latter two wall section unifies.
2. the method for diaphram wall of constructing in a kind of basement rock according to claim 1, it is characterised in that: torn open in the S2
After mould every 2 meter amperes set up and down twice support, support use >=80mm diameter round log with [10 channel steel supports, at the same forbid weight
Type machinery, close to wall walking is led, prevents from leading wall deformation before concrete is not up to design strength.
3. the method for diaphram wall of constructing in a kind of basement rock according to claim 1, it is characterised in that: be in the S3
Guarantee the thickness of protective layer, horizontal direction sets 2-3 column spacer pad on steel reinforcement cage width, and the vertical spacing of each column cushion block is set by 3m
It sets.
4. the method for diaphram wall of constructing in a kind of basement rock according to claim 1, it is characterised in that: rushed in the S5
Slot is constructed using domestic ZP-3 percussive drill, is equipped with rectangular block stamp, and block stamp planar dimension is 0.76mX1.2m, integral cast steel, weight
Amount selects weight under the limitation of drilling machine traction function as far as possible.
5. the method for diaphram wall of constructing in a kind of basement rock according to claim 1, it is characterised in that: in the S7 such as
Fruit steel reinforcement cage smoothly in insertion groove, cannot hang out immediately, find the cause and solve, hang again after repairing slot if necessary
It puts, cannot insert by force, steel reinforcement cage otherwise can be caused to deform or make landslip of the sides of the trench, generate a large amount of sediments.
6. the method for diaphram wall of constructing in a kind of basement rock according to claim 1, it is characterised in that: mixed in the S8
Solidifying soil perfusion uses concreting in water, and conduit selects the round screw thread quick coupling type of D=250, will with concreting frame
Conduit hangs groove inlet section specified position, installs square-shaped hopper at the top of conduit, the rate of climb of concrete surface is no less than 2.0m/h, leads
Depth is preferably 2-6m in pipe Transducers Embedded in Concrete, and the slump is tested before concreting, concrete is carried out in casting process
Test block: when construction of diaphragm wall, each unit groove section concrete should make 1 group of compression strength test, and every 5 slot sections should make
1 group of impermeability pressure test specimen, and make a record.
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| CN114411766A (en) * | 2022-03-01 | 2022-04-29 | 中煤江南建设发展集团有限公司 | Construction method of enclosure structure |
| CN114855849A (en) * | 2022-05-25 | 2022-08-05 | 暨南大学 | Rigid-flexible combined underground diaphragm wall anti-seepage joint and construction method thereof |
| CN116464033A (en) * | 2023-03-20 | 2023-07-21 | 中国建筑第四工程局有限公司 | Construction method for underground continuous wall under complex geological conditions |
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| CN114855849A (en) * | 2022-05-25 | 2022-08-05 | 暨南大学 | Rigid-flexible combined underground diaphragm wall anti-seepage joint and construction method thereof |
| CN116464033A (en) * | 2023-03-20 | 2023-07-21 | 中国建筑第四工程局有限公司 | Construction method for underground continuous wall under complex geological conditions |
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