CN109680676A - A kind of ventilating shaft building enclosure and its construction method - Google Patents

A kind of ventilating shaft building enclosure and its construction method Download PDF

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Publication number
CN109680676A
CN109680676A CN201811600406.8A CN201811600406A CN109680676A CN 109680676 A CN109680676 A CN 109680676A CN 201811600406 A CN201811600406 A CN 201811600406A CN 109680676 A CN109680676 A CN 109680676A
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CN
China
Prior art keywords
wall
mud
concrete
construction
grooving
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Pending
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CN201811600406.8A
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Chinese (zh)
Inventor
常顺
朱连臣
王有旗
程杰
窦存龙
蔡咏麟
项勇
薛林
刘普前
辛柱桥
宋昱宇
李苗
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China Railway 25th Bureau Group Co Ltd
Fifth Engineering Co Ltd of China Railway 25th Bureau Group Co Ltd
Original Assignee
China Railway 25th Bureau Group Co Ltd
Fifth Engineering Co Ltd of China Railway 25th Bureau Group Co Ltd
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Application filed by China Railway 25th Bureau Group Co Ltd, Fifth Engineering Co Ltd of China Railway 25th Bureau Group Co Ltd filed Critical China Railway 25th Bureau Group Co Ltd
Priority to CN201811600406.8A priority Critical patent/CN109680676A/en
Publication of CN109680676A publication Critical patent/CN109680676A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/18Bulkheads or similar walls made solely of concrete in situ
    • E02D5/187Bulkheads or similar walls made solely of concrete in situ the bulkheads or walls being made continuously, e.g. excavating and constructing bulkheads or walls in the same process, without joints
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00Handling building or like materials for hydraulic engineering or foundations
    • E02D15/02Handling of bulk concrete specially for foundation or hydraulic engineering purposes

Abstract

The invention discloses a kind of ventilating shaft building enclosure and its construction methods, it is characterized in that, it is gone along with sb. to guard him using diaphragm wall the following steps are included: S1: surveying and locating, measuring is required to go out subterranean wall axial line control stake according to putting outside, S2: construction of guide wall, wall is led using " ┓ ┏ " type monolithic reinforced concrete structure, S3: continuous wall trench construction, it is constructed using hydraulic grab bucket grooving machine, each width diaphram wall should job-hop construction on same straightway, S4: fabrication of reinforcing cage, according to the quantity of grooving equipment and the actual conditions of construction site, steel reinforcement cage is concentrated by processing factory and carries out accessory processing, it is transported to on-site assembly, set up assembling steel reinforcement cage platform in scene;S5: setting concrete conduit, concrete perfusion use quick coupling steel conduit, and mouth is higher than bottom hole under conduit, hangs and pours frame, connects conduit;S6: wall concrete is poured, beneficial effects of the present invention: uses this construction technique, be conducive to improve production efficiency, facilitate personnel placement, materials allocating guarantees construction quality.

Description

A kind of ventilating shaft building enclosure and its construction method
Technical field
The invention belongs to architectural construction technology technical fields, and in particular to a kind of ventilating shaft building enclosure and its construction method.
Background technique
Ventilating shaft needs diaphram wall to go along with sb. to guard him it, and diaphram wall is that foundation engineering uses a kind of digging on the ground Groove mechanical under the conditions of mud off, excavates out a long and narrow deep trouth along the periphery axis of deep excavation project, after clear slot, Steel reinforcement cage is hung in slot, then builds up a unit groove section with tremie method underwater concreting with tremie method, is so carried out paragraph by paragraph, on ground Under build up continuous armored concrete wall together, as intercept water, antiseepage, load-bearing, water-retaining structure.
Arrangement for the construction technology of diaphragm wall, will have a direct impact on the efficiency of construction, while also will affect construction quality, Urgent need develop it is a kind of facilitate construction, guarantee the construction technique of construction quality.
Summary of the invention
For the arrangement of the construction technology of diaphragm wall in the prior art, the efficiency of construction will have a direct impact on, while also can shadow The problem of ringing construction quality provides a kind of ventilating shaft building enclosure and its construction method.
A kind of ventilating shaft construction method of enclosure structure, which is characterized in that gone along with sb. to guard him using diaphragm wall, comprising the following steps:
S1: surveying and locating requires measuring to go out subterranean wall axial line control stake, control stake setting protection stake, elevation according to putting outside Scene is introduced, using survey method is closed back, bench mark in field is set, the absolute altitude for leading wall and diaphram wall is controlled with this;
S2: construction of guide wall leads wall using " ┓ ┏ " type monolithic reinforced concrete structure,
S3: continuous wall trench construction is constructed, each width diaphram wall is answered on same straightway using hydraulic grab bucket grooving machine Job-hopping construction, supplies mud by mud system, and for Slurry Storage in steel mud pit, mud uses swelling mud, and CMC is added and increases Stick, soda ash auxiliary material match, and are claimed by storage hopper screw conveyor, pound, quantitative water tank, slurry mixer, medicament storage Liquid Preparation equipment is prepared, and mud circulation is conveyed and recycled with slush pump, forms mud circulation line by slush pump and hose: During grooving, mud injects box cut section by circulating box, and side is excavated marginal not and entered, during clear slot, using Pump breath countercirculate, Mud is pumped into slot by circulating box, and mud is extracted into sand filter in slot, after physical treatment, returns to circulatory pool, during concrete pouring, Top mud returns to sand filter, passes into disuse;
S4: fabrication of reinforcing cage is collected according to the quantity of grooving equipment and the actual conditions of construction site, steel reinforcement cage by processing factory Middle progress accessory processing, is transported to on-site assembly, assembling steel reinforcement cage platform is set up at scene;
S5: setting concrete conduit, concrete perfusion use quick coupling steel conduit, and mouth is higher than bottom hole under conduit, hangs and pours Frame connects conduit;
S6: pouring wall concrete, and when concrete is perfused, to inflate bladders as water proof bolt, concrete tank car is directly sent concrete on conduit Funnel in, water velocity control will synchronize progresss at 2~6 ms/h, perfusion at each conduit, holding concrete face is horizontal State rises, and concrete face height difference is not greater than 300mm, and conduit pipe laying value should be controlled in 2m~6m, and filling process will be carried out continuously, Break period must not exceed 30 minutes, is poured into wall top position and wants superfilled 0.5m, recycles after bladders emersion mud liquid level.
On the basis of above scheme, the construction procedure that the step S2 leads wall is as follows:
S21 surveying setting-out: it is made according to diaphram wall axis and leads wall shoveling boundary line;
S22 channel excavation: after surveying and locating, wall is led using the mechanical method excavation combined with manual amendment of cutting the earth, is dug Native absolute altitude is controlled by manual amendment, forbids to backbreak, and according to practical geological condition, substrate is tamped to or is laid with 5 cm thick, 15 coagulation Soil padding;
It S23 formwork erection and pours concrete: leading wall and meet native face clay model, inside uses punching block and steel pipe support, and concrete placings are using insertion Formula vibrator vibrates, using layering, it is symmetrical, pour sequence in parallel;
S24 demoulding and propping: concrete can be with demoulding after reaching some strength, while support is layered on interior wall, prevents from leading Wall inwardly squeezes;
S25 backfill: it leads after wall torn mould and propping open, should lead wall behind back-filling in layers cohesive soil immediately and be compacted;
S26 construction joint: answering dabbing at construction of guide wall seam, construction joint should be staggered with underground continuous wall connector;
S27 leads wall maintenance: when leading wall and making rear natural curing to 70% design strength or more, can carry out grooving work Industry;
S28 leads wall framing: after construction of guide wall, drawing framing line on leading wall top face immediately, indicates unit with red paint The number of slot section, while every width wall top absolute altitude is measured, it is labeled on construction drawing, in case having good grounds.
On the basis of above scheme, the step S3 continuous wall trench construction technology is as follows:
S31 preparation of construction,
Before chute forming machine grooving, check wall top absolute altitude, verticality, spacing, axis etc. is led, technical staff will accurately exist Lead on wall with paint mark box cut fragment position, often grab width position, first open width grooving width position, steel reinforcement cage lay-down position, Mud liquid level, and slot segment number is marked, chute forming machine, dump truck are in place, remove unit groove section and lead wall support, are leading wall two Side is built a dam, and rubbish incidental in slot section is removed completely, is connected mud tube and is simultaneously tried to send mud, checks its whether unimpeded and spillage, and Leak detection is sent into the various performance indicator Ying Youxiang of mud in slot then to mud is injected in the width section to wall top or less 30cm is led Thin recording is for future reference,
The control of S32 grooving verticality,
Before grooving, using the flatness of vehicle-mounted level meter adjustment grooving equipment, during grooving, using in grooving equipment Verticality instrument and automatic deviation rectifying device guarantee grooving verticality, and grooving vertical precision must not be lower than design requirement, joint The deviation of any depth of center line of adjacent two slots section is not greater than the result value of groove depth × verticality 1/300,
S33 grooving is excavated,
It is divided by slot section, framing job-hopping construction, standard cell section uses " three methods " milling slot, i.e., every width construction of diaphragm wall When, first grab soil at both sides, after grab the center soil body, repeatedly excavate until design slot bottom absolute altitude until, angle groove section press elder generation it is short The principle of long side excavates molding behind side, and when grooving, mud should be filled into unearthed amount, to guarantee mud liquid level in defined height Degree should not fill into mud when grabbing bucket driving, should carry out connector processing to closure width section and connection width section, be carried out with brush wall device Brush wall after grooving to absolute altitude, should first carry out a cleaning bottom of hole after shovel wall, and 50cm or so is removed in grab bucket every time when cleaning bottom of hole, it is ensured that slot bottom Heavy quarrel thickness is not more than 10cm, and control errors are in code requirement, after cleaning bottom of hole, carry out borehole cleaning with Pump breath countercirculate method.
Preferably, 2 sets conduits are set in "-" type and " ┐ " type groove section, in slot section 3 sets of conduits of setting of " Z " type, two sets Conduit spacing is not preferably greater than 3 meters, and conduit away from groove end less than 1.5 meters, put in conduit apart from about 50cm centimetres of slot bottom by conduit Enter water proof bladders, sphere diameter is Ф 250mm, hangs slush pump in notch, connects mud veclamation pipeline, leads directly to adjustment pond.
A kind of ventilating shaft building enclosure, the diaphragm wall made of above-mentioned construction method, the interior outside each one of the diaphragm wall Uniaxial mixing pile cell wall is arranged to reinforce.
Beneficial effects of the present invention:
Using this construction technique, is conducive to improve production efficiency, facilitates personnel placement, materials allocating guarantees to apply Working medium amount.
Detailed description of the invention
Fig. 1 is the floor map of the diaphragm wall of one embodiment of the invention;
Fig. 2 leads wall construction section for one embodiment of the invention and sees figure;
Fig. 3 is one embodiment of the invention protective layer cushion block detail drawing;
Fig. 4 is one embodiment of the invention structure principle chart;
Fig. 5 is one embodiment of the invention slurrying flow chart;
Fig. 6 is one embodiment of the invention mud circulation technology process;
Fig. 7 is one embodiment of the invention construction of diaphragm wall technique flow chart.
Specific embodiment
With reference to the attached drawing in the embodiment of the present invention, technical scheme is described further.
As shown in Figure 1, the floor map of the diaphragm wall to be constructed, a kind of ventilating shaft construction method of enclosure structure, using ground Lower diaphragm wall is gone along with sb. to guard him, and process flow chart is as shown in fig. 7, comprises following steps:
S1: surveying and locating;
Measuring is required to go out subterranean wall axial line control stake according to putting outside, protection stake must be arranged in control stake, and elevation introduces scene, adopts With survey method is closed back, bench mark in field is set, the absolute altitude for leading wall and diaphram wall is controlled with this;
S2: construction of guide wall;
Before continuous wall trench underground, it should pour and lead wall.It leads wall production and accomplishes well construction, lead the quality of wall quality directly Sideline and the absolute altitude for influencing diaphram wall, are that grooving equipment is oriented to, and are that storage mud stablizes liquid level, safeguard the top soil body Stablize, the important measures for preventing the soil body from collapsing, construction of guide wall sequence is identical as ground-connecting-wall.
Leading wall is the key that guarantee that diaphram wall position is accurate and grooving quality, due to wall top construction machinery load compared with Greatly, therefore using " ┓ ┏ " type monolithic reinforced concrete structure wall is led.Its clear span is 10-12cm bigger than diaphram wall thickness, leads Wall top mouth and ground are flat, rib thickness 200mm, and clear span 1100mm (clear span 1120mm in bellend) in standard paragraphs, depth 2.2m are led Wall is inserted into undisturbed soil 15cm, and leads wall top face higher than level of ground water 1.5m or more, and leading wall strength grade of concrete is C25, must not Spillage.The construction joint for leading wall should be staggered with underground continuous wall connector, lead wall top adjustment it is above ground level be not less than 10 centimetres, to prevent Only the surface water flows into slot, pollutes mud.It leads wall top face and is made into level, consider that ground line gradient influences, it is in place to be made into 10 ~15 centimetres of steps.It leads wall construction section and sees Fig. 2.
Construction of guide wall method:
S21 surveying setting-out: it is made according to diaphram wall axis and leads wall shoveling boundary line.
S22 channel excavation: after surveying and locating, wall is led using the mechanical method excavation combined with manual amendment of cutting the earth.It digs Native absolute altitude is controlled by manual amendment, forbids to backbreak.According to practical geological condition, substrate is tamped to or is laid with 5 cm thick, 15 coagulation Soil padding.
It S23 formwork erection and pours concrete: leading wall and meet native face clay model, inside uses punching block and steel pipe support, and concrete placings are using insertion Formula vibrator vibrates, and using being layered, pouring sequentially symmetrically, in parallel, prevents from that wall is caused to translate because of concrete placings unevenness.
S24 demoulding and propping: concrete can be with demoulding after reaching some strength, while support is layered on interior wall, prevents from leading Wall inwardly squeezes, the lumps of wood (100mm × 100mm) horizontal space 2.0m, between the upper and lower away from for 1.0m.It is strong to reach design in the concrete for leading wall Before degree, any heavy-duty machinery and transporting equipment is forbidden to pass through beside it.
S25 backfill: it leads after wall torn mould and propping open, should lead wall behind back-filling in layers cohesive soil immediately and be compacted.
S16 construction joint: answering dabbing at construction of guide wall seam, construction joint should be staggered with underground continuous wall connector.
S17 leads wall maintenance: when leading wall and making rear natural curing to 70% design strength or more, can carry out grooving work Industry.
S28 leads wall framing: after construction of guide wall, drawing framing line on leading wall top face immediately, indicates unit with red paint The number of slot section;Every width wall top absolute altitude is measured simultaneously, is labeled on construction drawing, in case having good grounds.
S3: continuous wall trench construction;
S4: lifting steel reinforcement cage;
Assembling steel reinforcement cage platform
According to the quantity of grooving equipment and the actual conditions of construction site, steel reinforcement cage concentrates progress accessory to add by processing factory Work is transported to on-site assembly, and scene need to set up 3, assembling steel reinforcement cage platform, and the platform size set up is 6m × 28m.
According to the bar spacing of design, the design position of joint bar, built-in fitting and reinforcing bar connector draws control label, with Guarantee the laying precision of steel reinforcement cage and built-in fitting, rack carries out levelling using instrument using No. 10 channel steel production, and channel steel is welded into It is grid-like.Steel reinforcement cage platform flatness is the precondition of steel reinforcement cage processing quality, therefore stringent in platform manufacturing process Its flatness is controlled, and also wants its flatness of periodic inspection in use.
Fabrication of reinforcing cage shifts to an earlier date 5 days to the predetermined accessory of reinforcing bar concentrated processing factory according to unit groove section size, incites somebody to action within 2 days in advance Accessory is sent to construction site, and on-site assembly main reinforcement uses straight screw sleeve connector.According to slot section size, horizontal bar is carried to flat On platform, is put well by design spacing, place into longitudinal reinforcement and weld, it is desirable that be crossed as right angle (being spaced apart truss position) in length and breadth;Lower layer After reinforcing bar connects, the reinforcing bar protection block of lower layer is welded, truss welding is carried out, truss and lower layer's steel pipe is made to be adjusted to right angle; It welds support muscle, top bars and lateral tie and suspension centre again to reinforce, steel reinforcement cage is shelved a little etc., last welded reinforcement connector. Welding quality meets design requirement, it should be noted that strict control welding quality at suspension centre reinforcement.It must be by inspection after fabrication of reinforcing cage It tests, can lift by crane after meeting the quality standard requirement into slot.There is the slot section of H profile steel connector, steel reinforcement cage connect guarantee welding with fashioned iron Area, weld seam are answered full, and intensity is met the requirements.Steel reinforcement cage is connect through distributing reinforcement and I-steel edge of a wing welding by both sides with i shaped steel It connects in succession, fusion length 100mm.
Reinforcing bar cage hoisting and the requirement hung:
(1) after steel reinforcement cage and conduit hang slot, Ying Huitong designing unit carries out acceptance of concealed work to unit groove section, closes It can pouring underwater concrete after lattice.
(2) unit groove section steel reinforcement cage preferably integrally assembly and sinking.When steel reinforcement cage must be segmented, welding or machinery are preferably used even It connects, splice position is preferably selected in stress smaller part, and should meet existing national standards " Code for design of concrete structures " (GB50010) to the pertinent regulations of reinforcing bar connection.It should be noted that upper and lower section reinforcing bar contraposition is accurate when construction, guarantee that steel reinforcement cage is straight.
(3) during lifting by crane, steel reinforcement cage should have enough rigidity, and longitudinal reinforcement truss can be used and main reinforcement plane is oblique The methods of tie rod, it is ensured that the protective layer thickness of reinforcing bar, the method that protective layer cushion block can be used when placement.
(4) using welding, pad must be secured in the reinforcing bar crosspoint at least 50% of steel reinforcement cage, and interim galvanized wire binding point exists Reinforcing bar should be removed all before entering slot.
(5) after steel reinforcement cage is in place should in 4 hours casting concrete, failed casting concrete more than 4 hours, should be steel Muscle cage tune rises, again back into slot after rinsing well.
(6) preferably there are the gap 500mm, end and junction block or the phases of steel reinforcement cage two sides between the lower end and slot bottom of steel reinforcement cage The gap of 100mm~150mm should be reserved between adjacent wall section concrete connector face.
(7) steel reinforcement cage should take effective measures in production, transport, hoisting process prevents steel reinforcement cage from deforming, in steel reinforcement cage On have at built-in fitting and built-in fitting should be covered using polyethylene foam sheet, built-in fitting is dug out when in order to need.
(8) dimensions of reinforcing bar connector, level are to vertical positioning please according to Ben Tu and the related drawing of main structure It carries out.
The selection of steel reinforcement cage suspension centre material, conduit storehouse arrangement are reinforced with steel reinforcement cage
(1) selection of suspension centre material: according to this engineering steel reinforcement cage weight, general reinforcement cage hoisting suspension centre is selected Round steel, " L " steel bar cage increase bi-steel support, are arranged at suspension centre, and every 6m is arranged one grade.First water of steel reinforcement cage topmost Flat muscle is reinforced with upper and lower two grade III steel Φ 32mm.
Steel reinforcement cage generates not recoverable deformation in hoisting process in order to prevent, and all kinds of steel reinforcement cages are respectively provided with longitudinal bending resistance Truss, corner shape steel reinforcement cage also need to add positioning brace etc..
(2) setting in conduit storehouse: conduit storehouse being arranged according to slot section width, referring to specification, the coverage of every conduit For 2m, two conduits are set, two conduit spacing are not greater than 3m, are not greater than 1.5m according to slot end spacing.
(3) reinforcing of steel reinforcement cage: steel reinforcement cage is reinforced at suspension centre using truss.
Steel bar cage protecting layer setting
To guarantee that the thickness of protective layer meets native face 7cm, soil face 7cm is carried on the back, it is fixed to set two column for horizontal direction on steel reinforcement cage width Position cushion block, the vertical spacing of each column cushion block are arranged by 4m, as shown in Figure 3.
S5: setting concrete conduit;
Concrete requirement
Diaphram wall uses commerical ready-mixed concrete, and strength grade uses C35, P8 underwater concrete.With general underwater mixed The construction characteristic of solidifying soil casting, the slump are controlled in 180~220mm, should there is good workability.Meet the resistance to compression of design requirement The indexs such as strength grade, anti-permeability performance and elasticity modulus.It is carried out by qualified testing inspection unit according to design document before construction Mix Ratio Test, test report are sent out the mixed station of quotient after supervising engineer examines and are executed.
Conduit arrangement
Concrete perfusion use internal diameter forQuick coupling steel conduit, save a length of 2m.Mouth is away from bottom hole under conduit 500mm should not be too large or too small.Specific requirement is as follows:
It hangs and pours frame, connect conduit, generally use two sets of conduits, conduit mouth is about 50cm away from bottom hole, be should not be too large or mistake It is small.
Conduit makees leakproofness experiment on ground, and pressure is controlled in 0.6-0.7MPa.In "-" type and " ┐ " type groove section setting 2 Conduit is covered, 3 sets of conduits are set in the slot section of " Z " type, two sets of conduit spacing are not preferably greater than 3 meters, and conduit is not preferably greater than away from groove end 1.5 meters, about 50cm centimetres of conduit lift-off slot bottom.Conduit wants up and down smooth in steel reinforcement cage, be perfused before using conduit into Slurry is changed at the secondary clear bottom of row Pump breath countercirculate, and baffle is arranged on notch, in case concrete falls into slot and pollutes mud.
Water proof bladders is put into conduit, sphere diameter is Ф 250mm.
Slush pump is hung in notch, connects mud veclamation pipeline, leads directly to adjustment pond.
S6: wall concrete is poured;
After preparation, it is desirable that concrete deliverability is in 36m3/ H or so, supplied materials uniformly continuous, workability is good, collapses Degree of falling is 18~22cm, and undesirable concrete should return goods.
When concrete is perfused, to inflate bladders as water proof bolt, concrete tank car is directly sent concrete in supravasal funnel, pours speed Degree control is at 2~6 ms/h.It to synchronize progress when perfusion at each conduit, keep concrete face to be in a horizontal state risings, concrete face height Difference is not greater than 300mm.In filling process, concrete is sent constantly into conduit, has often poured 1-2 vehicle concrete, copes with supplied materials number formulary and actual measurement The number formulary that concrete face depth is reflected in slot is proofreaded once with lining rope, and the two should be consistent substantially, and measurement data will record completely.It leads Pipe pipe laying value should be controlled in 2m~6m, when conduit >=6m or so pipe laying value, should remove a section conduit, the conduit of dismounting is specified Position is rinsed well, is stacked neatly, when concrete is not smooth, can be carried up and down conduit, amplitude is in 30cm or so.Filling process is wanted It is carried out continuously, the break period must not exceed 30 minutes, is poured into wall top position and wants superfilled 0.5m.
It is recycled after bladders emersion mud liquid level, in case continuing to use, opens and poured simultaneously in concrete, start slush pump recycling mud, Last 5m or so mud is then pumped into waste pulp pond as seriously polluted.
In 4 vehicle last from scheduled plan, often pours a vehicle and survey a concrete face absolute altitude, it will last required concrete amount notice stirring It stands.Concrete can terminate after pouring to absolute altitude.Pouring concrete construction is as shown in Figure 4.
In pouring underwater concrete, if being mixed into mud in discovery conduit leak, blocking or concrete, should stop to fill immediately into Row processing, and make a record.
Pull connector case and concrete sample
(1) it opens and pours the first vehicle concrete, sampling does one group of test block on side, when test block reaches pre-hardening (finger has pressed finger mark) (about 4-5 hours), can carry connector case, primary, promotion amplitude 30cm or so be carried every 5-10 minutes later, in concrete pouring After 6-8 hours, pull up connector case with crane.Specific crane shows tonnage pulling force etc. to control jacking speed.
(2) formally start the time of lifting sub case, the concrete test block done when should be to start placing concrete reaches eventually The solidifying state time experienced is foundation, does not such as do test block, start to promote connector case should start 7 hours of placing concrete with Afterwards, as commerical ready-mixed concrete added retarding water reducer, start hydraulic lifting machine and the connector case time is promoted also to need to postpone.
(3) during hydraulic lifting machine promotes connector case, record sheet poured according to on-site concrete, calculates connector case The height for allowing to pull is forbidden early pull out, pull out more.
(4) crawler crane promotes connector case, artificial cooperative job, segmentation disassembly.
(5) after connector case is extracted, protective equipment and obvious safety sign, the night position are disposed immediately in connector case position Red light has been installed to warn.
(6) every 100m3Concrete does one group of resistance to compression test block, less than 100m3By 100m3Meter, every 500m3Do one group of impervious examination Block.Per car concrete all has to field sampling, makees slump consistancy test, and discovery is underproof, retracts supply producer immediately, forbids It uses.
Underwater concreting technical measures
(1) guarantee the workability of concrete, slot should be poured into time after concrete to scene.To guarantee concrete in conduit Interior mobility prevents distress in concrete, presss from both sides mud phenomenon, and the casting of slot section concrete should keep concrete surface uniformly to rise, And continuous casting;
(2) 2~6 meters in conduit Transducers Embedded in Concrete, in order to avoid it is involved in the sediment of top of concrete or mud in concrete, shadow Concrete quality is rung, while in concrete casting, concrete cannot be trickled down in slot, pollute mud;
(3) the slot inner concrete face rate of climb, no less than 2 ms/h, otherwise not can guarantee the quality of concrete;
(4) concrete slump control must have concrete mix report before being poured concrete to 18cm~22cm, and Answer the on-the-spot test slump;
(5) concrete casting is carried out, conduit removes record, accident treatment record etc..
Mud system
Mud off requirement
(1) for such as foundation pit range there are mud, the weak scall of silt clay layer of sand, continuous wall trench is more difficult, Construction period is to avoid cell wall collapse hole, and mud face necessarily is greater than level of ground water 1m or more in slot, should suitably be mentioned in layer of sand construction High mud balance and viscosity increase mud storage level.
(2) mud should carry out Recovery Purifying reuse.Mud purification recycling can be used vibrating screen, cyclone, chute and The methods of sedimentation basin (coagulative precipitation) or forced dehydration.
(3) discarded mud should be handled by the pertinent regulations of environmental protection.
Mud pit setting
Slurry Storage uses steel mud pit, and capacity presses formula:
Qmax=n × V × K is calculated,
N --- for grooving number of segment simultaneously, n=1;
V --- it is unit groove maximum shoveling amount, HP3 ventilating shaft V=6 × 1.3 × 25.076=195.59m3
K --- it is mud redundancy, K=1.3;
That is it is Qmax=254.27m that a chute forming machine, which needs mud,3
Two hydraulic grab bucket grooving machines of HP3 ventilating shaft proposed adoption are constructed simultaneously, then the steel of eight 6m*3m*2m is laid at scene Mud pit, total 288m3.Mud pit location arrangements to consider to take into account the laying for being conducive to mud circulating line and mud materials and The transport of waste pulp, in order to prevent because the natural causes such as rainy day destroy mud property and quality, it is necessary to rain-proof facility be arranged.Mud pit Upper setting shield (yellow), mud canopy want secured, reliable, rain-proof, Fang Tai.
Mud match ratio
Subterranean wall constructs grooving using premium mud retaining wall, and mud composition uses swelling mud, CMC tackifier (carboxylic is added Methyl receives cellulose, also known as artificial paste), auxiliary materials, the mud experience composition and ratio such as soda ash it is new to prepare mud property index It is shown in Table 1, table 2.
1 mud experience of table proportion
Title material Water Bentonite (commodity clay) Additive (CMC) Soda ash (Na2CO3)
Match ratio 1000kg 80kg 1.3kg 4.5kg
Table 2 prepares mud property index
Mud match ratio should be according to the performance of material in construction, and soil property situation is practical to be adjusted.
Mud production
Slurrying equipment include storage hopper screw conveyor, pound claim, quantitative water tank, slurry mixer, medicament liquid receiver Deng.Medicament preparation is first carried out before stirring, soda ash liquid compound concentration is 1:10~1:5, compound concentration of the CMC liquid to high viscosity mud It is 1.5%.Water is first added to 1/3 when stirring, then CMC powder is slowly sprinkled into, bulk CMC is stirred into small with flexible axle blender Grain, continues to add water and stir.Prepared CMC liquid stands the rear 6h and can be used.Water is first added into mixing drum 1/3 before mud stirring After start blender, constantly add water simultaneously in quantitative water tank, be added bentonite, soda ash liquid, stir 3min after, be added CMC liquid after Continuous stirring.The mud being stirred should be stood to be used afterwards for 24 hours.Slurrying process is shown in Fig. 5.
Mud circulation
Mud circulation forms mud circulation line by slush pump and hose using 5 3PNL slush pump conveyings and recycling.
1. during grooving, mud by circulating box inject box cut section, side excavate marginal not enter, keep slurry liquid identity distance from 0.2 meter of metope or so is led, and is higher than 1 meter of level of ground water or more.
2. during clear slot, using Pump breath countercirculate, mud is pumped into slot by circulating box, and mud is extracted into sand filter in slot, After physical treatment, circulatory pool is returned.
3. during concrete pouring, top mud returns to sand filter, and the mud more than concrete top surface in 4 meters is discharged to waste pulp case, It passes into disuse in principle.
Waste pulp processing
One mud disposal system being made of pulper, cyclone, reciprocating sieve and mud pit of scene setting, the system of mud Standby, storage, conveying, circulation, separation etc. are completed by mud disposal system.Heatable adobe sleeping platform and mud sediment are deposited in addition, building at the scene Pond and cesspool etc. guarantee that mud does not land, to reduce the pollution to environment.Unrenewable mud and concrete placings are set on inspection Solidfied material is transported to designated place with tank car and given up by the poor mud to swap out after sedimentation basin, cyclone, reciprocating sieve separating treatment It abandons, constructs sewage through precipitation and purification and after reaching discharge standard, be discharged into urban sewage pipeline.
A kind of ventilating shaft building enclosure, the diaphragm wall made of above-mentioned construction method, the interior outside each one of the diaphragm wall Uniaxial mixing pile cell wall is arranged to reinforce.
It will be appreciated that although an embodiment of the present invention has been shown and described, for the ordinary skill people of this field For member, it is possible to understand that a variety of changes can be carried out to these embodiments without departing from the principles and spirit of the present invention Change, modification, replacement and variant, the scope of the present invention is defined by the appended.

Claims (6)

1. a kind of ventilating shaft construction method of enclosure structure, which is characterized in that gone along with sb. to guard him using diaphragm wall, comprising the following steps:
S1: surveying and locating requires measuring to go out subterranean wall axial line control stake, control stake setting protection stake according to putting outside, and elevation introduces Scene is arranged bench mark in field, the absolute altitude for leading wall and diaphram wall is controlled with this using survey method is closed back;
S2: construction of guide wall leads wall using " ┓ ┏ " type monolithic reinforced concrete structure,
S3: continuous wall trench construction is constructed, each width diaphram wall should job-hop on same straightway using hydraulic grab bucket grooving machine Construction, supplies mud by mud system, and for Slurry Storage in steel mud pit, mud uses swelling mud, and CMC thickening is added Agent, soda ash auxiliary material match, and are claimed by storage hopper screw conveyor, pound, quantitative water tank, slurry mixer, medicament reservoir Preparation equipment is prepared, and mud circulation is conveyed and recycled with slush pump, forms mud circulation line by slush pump and hose: During grooving, mud injects box cut section by circulating box, and side is excavated marginal not and entered, during clear slot, using Pump breath countercirculate, mud Slurry is pumped into slot by circulating box, and mud is extracted into sand filter in slot, after physical treatment, returns to circulatory pool, during concrete pouring, on Portion's mud returns to sand filter, passes into disuse;
S4: fabrication of reinforcing cage, according to the quantity of grooving equipment and the actual conditions of construction site, steel reinforcement cage by processing factory concentrate into The processing of row accessory, is transported to on-site assembly, assembling steel reinforcement cage platform is set up at scene;
S5: setting concrete conduit, concrete perfusion use quick coupling steel conduit, and mouth is higher than bottom hole under conduit, hangs and pours frame, connects Conduit;
S6: wall concrete is poured.
2. ventilating shaft construction method of enclosure structure as described in claim 1, which is characterized in that the step S2 leads the construction step of wall It is rapid as follows:
S21 surveying setting-out: it is made according to diaphram wall axis and leads wall shoveling boundary line;
S22 channel excavation: after surveying and locating, wall is led using the mechanical method excavation combined with manual amendment of cutting the earth, mark of cutting the earth Height is controlled by manual amendment, forbids to backbreak, and according to practical geological condition, substrate is tamped to or is laid with 5 cm thick, 15 concrete mats Layer;
It S23 formwork erection and pours concrete: leading wall and meet native face clay model, inside uses punching block and steel pipe support, and concrete placings are using plug-in type vibration Device is smash to vibrate, using layering, it is symmetrical, pour sequence in parallel;
S24 demoulding and propping: concrete reaches can be with demoulding after some strength, while support is layered on interior wall, prevent from leading wall to Interior extruding;
S25 backfill: it leads after wall torn mould and propping open, should lead wall behind back-filling in layers cohesive soil immediately and be compacted;
S26 construction joint: answering dabbing at construction of guide wall seam, construction joint should be staggered with underground continuous wall connector;
S27 leads wall maintenance: when leading wall and making rear natural curing to 70% design strength or more, can carry out grooving operation;
S28 leads wall framing: after construction of guide wall, drawing framing line on leading wall top face immediately, indicates unit groove section with red paint Number, while measuring every width wall top absolute altitude, be labeled on construction drawing, in case having good grounds.
3. ventilating shaft construction method of enclosure structure as described in claim 1, which is characterized in that the step S3 continuous wall trench is applied Work technique is as follows:
S31 preparation of construction,
It before chute forming machine grooving, checks wall top absolute altitude, verticality, spacing, axis etc. is led, technical staff accurately will lead wall It is upper to mark box cut fragment position with paint, often grab width position, first open width grooving width position, steel reinforcement cage lay-down position, mud Liquid level, and slot segment number is marked, chute forming machine, dump truck are in place, remove unit groove section and lead wall support, build leading wall two sides Dam removes rubbish incidental in slot section completely, connects mud tube and simultaneously tries to send mud, checks its whether unimpeded and spillage, and hunt leak, Then to mud is injected in the width section to wall top or less 30cm is led, the various performance indicators for being sent into mud in slot should have detailed note Record it is for future reference,
The control of S32 grooving verticality,
Before grooving, using the flatness of vehicle-mounted level meter adjustment grooving equipment, during grooving, using vertical in grooving equipment Instrument and automatic deviation rectifying device are spent to guarantee grooving verticality, and grooving vertical precision must not be lower than design requirement, and joint is adjacent The deviation of any depth of center line of two slot sections is not greater than the result value of groove depth × verticality 1/300,
S33 grooving is excavated,
It is divided by slot section, framing job-hopping construction, when standard cell section is using " three methods " milling slot, i.e. every width construction of diaphragm wall, First grab soil at both sides, after grab the center soil body, repeatedly excavate until design slot bottom absolute altitude until, angle groove section by elder generation short side after The principle of long side excavates molding, and when grooving, mud should be filled into unearthed amount, with guarantee mud liquid level in defined height, When grab bucket driving, mud should not be filled into, connector processing should be carried out to closure width section and connection width section, carry out brush wall with brush wall device, After grooving to absolute altitude, a cleaning bottom of hole after shovel wall should be first carried out, 50cm or so is removed in grab bucket every time when cleaning bottom of hole, it is ensured that the heavy quarrel of slot bottom is thick Degree is not more than 10cm, and control errors are in code requirement, after cleaning bottom of hole, carry out borehole cleaning with Pump breath countercirculate method.
4. ventilating shaft construction method of enclosure structure as described in claim 1, which is characterized in that the step S5: setting concrete conduit When, 2 sets of conduits are set in "-" type and " ┐ " type groove section, 3 sets of conduits are set in the slot section of " Z " type, two sets of conduit spacing are unsuitable Greater than 3 meters, for conduit away from groove end less than 1.5 meters, conduit is put into water proof bladders, ball apart from about 50cm centimetres of slot bottom in conduit Diameter is Ф 250mm, hangs slush pump in notch, connects mud veclamation pipeline, leads directly to adjustment pond.
5. ventilating shaft construction method of enclosure structure as described in claim 1, which is characterized in that the step S6 when concrete is perfused, To inflate bladders as water proof bolt, concrete tank car is directly sent concrete in supravasal funnel, water velocity control 2~6 meters/it is small When, progress is synchronized at when perfusion each conduit, concrete face is kept to be in a horizontal state rising, and concrete face height difference is not greater than 300mm, leads Pipe pipe laying value should be controlled in 2m~6m, and filling process will be carried out continuously, and the break period must not exceed 30 minutes, be poured into wall top position Superfilled 0.5m is wanted, is recycled after bladders emersion mud liquid level.
6. a kind of ventilating shaft building enclosure, the diaphragm wall being process using construction method as described in any one in claim 1-5, Each row single shaft mixing pile cell wall in outside is reinforced in the diaphragm wall.
CN201811600406.8A 2018-12-26 2018-12-26 A kind of ventilating shaft building enclosure and its construction method Pending CN109680676A (en)

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CN110424486A (en) * 2019-07-12 2019-11-08 广州穗岩土木科技股份有限公司 A kind of construction method of nonstandard diaphragm wall
CN110725301A (en) * 2019-10-19 2020-01-24 湖北广元岩土工程有限公司 Underground continuous wall construction method
CN112962580A (en) * 2021-03-08 2021-06-15 中国建筑一局(集团)有限公司 Underground continuous wall refined roundness connection structure and construction method thereof
CN112962579A (en) * 2021-03-08 2021-06-15 中国建筑一局(集团)有限公司 Construction method of underground continuous wall of coastal push-filling area
CN113202083A (en) * 2021-04-29 2021-08-03 中铁六局集团有限公司 Construction method of underground continuous wall
CN113494076A (en) * 2021-07-20 2021-10-12 北京建工土木工程有限公司 Method for processing pile foundation left in diaphragm wall range

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110424486A (en) * 2019-07-12 2019-11-08 广州穗岩土木科技股份有限公司 A kind of construction method of nonstandard diaphragm wall
CN110725301A (en) * 2019-10-19 2020-01-24 湖北广元岩土工程有限公司 Underground continuous wall construction method
CN112962580A (en) * 2021-03-08 2021-06-15 中国建筑一局(集团)有限公司 Underground continuous wall refined roundness connection structure and construction method thereof
CN112962579A (en) * 2021-03-08 2021-06-15 中国建筑一局(集团)有限公司 Construction method of underground continuous wall of coastal push-filling area
CN113202083A (en) * 2021-04-29 2021-08-03 中铁六局集团有限公司 Construction method of underground continuous wall
CN113494076A (en) * 2021-07-20 2021-10-12 北京建工土木工程有限公司 Method for processing pile foundation left in diaphragm wall range

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