CN109706952A - Large-scale well-sinking construction method - Google Patents

Large-scale well-sinking construction method Download PDF

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Publication number
CN109706952A
CN109706952A CN201811586980.2A CN201811586980A CN109706952A CN 109706952 A CN109706952 A CN 109706952A CN 201811586980 A CN201811586980 A CN 201811586980A CN 109706952 A CN109706952 A CN 109706952A
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China
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construction
sinking
open caisson
caisson
concrete
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龙敏健
徐福昌
柏志诚
李莹磊
黄宇凡
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Sixth Construction Co Ltd of China Construction Fourth Engineering Division Co Ltd
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Sixth Construction Co Ltd of China Construction Fourth Engineering Division Co Ltd
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Abstract

The invention discloses a kind of large-scale well-sinking construction methods, include the steps that open caisson pre-processing and caisson sinking construction;Wherein, open caisson pre-processing includes measurement review, excavation of foundation pit, caisson cutting edge support pad and caisson structure production;Caisson sinking construction includes cut the earth sinking, the setting of construction joint and processing and the dry back cover construction of open caisson.Be able to solve the open caisson present in existing large-scale well-sinking construction in soft layer using the above construction method prevents uneven subsidence, prominent heavy, control from sinking and being reduced to constructing technology problems such as ground disturbances eventually in draining and non-drainage subsidence, it is effectively prevent the problems such as prominent heavy, super heavy, partially heavy, realizes high-quality, efficient and controllable construction.

Description

Large-scale well-sinking construction method
Technical field
The present invention relates to a kind of large-scale well-sinking construction methods, belong to architectural engineering construction technique field.
Background technique
Open caisson is the works of pit shaft shape, it is sunk after overcoming borehole wall frictional resistance by self gravity with cutting the earth in well To designed elevation, then passes through concrete sealing bottom and clog wellhole, become the basis of Bridge Pier or other structures object.One As construction Bridge Piers foundation pit, sewage pumping station, large equipment base, people's air defense shelter, shield assembly well, underground driveway with It is used when the water conservancy project foundation construction enclosure device of station.Due to open caisson complied with developing country to the investments of some foundation engineerings and The economy of materials considers and Building Engineering Design takes into account basic and protection works the requirements being used in combination, in protection works Construction also mostly use.The size and embedded depth of open caisson all very flexibly, diameter have from brick open caisson it is super to hundreds of meters Large-scale well-sinking;Also a meter even rice up to a hundred differ the depth buried from several meters to tens, thus can be applicable in different requirement of engineering.It applies In work method compared with heavy excavation method, construction open caisson occupied area is small, can largely reduce earth volume excavated volume, avoids native around The collapsing of side.
Currently, many large-scale well-sinking engineerings being completed both at home and abroad, have accumulated certain technical experience.But due to air curtain The problems such as construction is complicated, and pressure-air consumption is big, and subsidence velocity is not easy to control, and error correct technical difficulty is big, many technical sides The popularization of case is restricted.From age, Europe starts to be widely applied to indentation thixotropic slurry between the borehole wall and soil is rubbed with reducing side The method of resistance.With the construction in more river, gulf over strait, strait Bridge, deep water foundation is greatly developed headed by China, Japan, is sunk Thus well construction technology obtains very big breakthrough.It is heavy heavy open caisson, deep water armored concrete have been developed in Nanjing Yangtze River Bridge Well and steel open caisson.Create multinomial first in bridge construction history.Construction of Wuhu Changjiang River Bridge be the domestic public affairs built using sheet stringer structure, The dual-purpose bridge of iron, its abutment production are also built with open caisson.Urban district especially dense in building, it is ensured that week Enclose the safety of building.Another advantage of open caisson construction is that inner space is available, is not required to sheet pile maintenance, and bearing capacity is high, with The continuous innovation of construction technology and construction machinery, at home and abroad all obtained more being widely applied and developing and in weak soil Occupy increasingly consequence in the Construction of Deep Foundation of underground structure.
In recent years, as socio-economic development and people's living standard requirement are higher and higher, environmental problem causes weight increasingly Depending on, and the processing problem of municipal sewage therein is increasingly urgent in each big city.Since the pumping plant for being used as sewage treatment is most It is built with open caisson, application prospect of the sink well technique in municipal works is more wide.Therefore to sinking well engineering construction technology research It is of great significance to.
However, the scale of caisson structure is big, work area soil layer is complicated, the physico-mechanical properties of different soil are widely different, and And be it is heterogeneous, anisotropic, exist there are many uncertain factor, complexity, diversity along with construction environment And variability, so that the construction of open caisson has the feature of dynamic uncertainty.The open caisson of soft layer is in the case where draining and not draining It prevents from uneven subsidence, prominent heavy, control heavy eventually in heavy and reduces to be that modern project is applied to constructing technology problems such as ground disturbances The problem of work.Open caisson construction engineering involves a wide range of knowledge, as soil mechanics, engineering geology, hydrogeology, structural mechanics and management, Monitoring, construction etc..No matter difficult points some so theoretically or in numerical simulation there is no final conclusion that can reflect so far.Most grinds Study carefully all be according in construction a certain moment, certain privileged site measurement data, analyzed, controlled with construction personnel's engineering experience System has and biggish blindness and is restricted by information feedback time, there is certain time lag, this to how to prevent it is prominent it is heavy, It is super that heavy, partially heavy there are apparent randomnesss.Therefore, such construction method be also do not comply with modern construction it is high-quality, efficiently and Controllable trend, once loss caused by accident occurs will be huge.Therefore open caisson construction especially large-scale well-sinking is applied Work method carry out innovation be very it is necessary to.
Summary of the invention
The object of the present invention is to provide a kind of large-scale well-sinking construction methods, to overcome existing large-scale well-sinking construction method to deposit Deficiency.
Technical scheme is as follows:
A kind of large-scale well-sinking construction method, includes the steps that open caisson pre-processing and caisson sinking construction;Wherein, before open caisson Phase processing includes measurement review, excavation of foundation pit, caisson cutting edge support pad and caisson structure production;Caisson sinking construction includes cutting the earth Sinking, the setting of construction joint and processing and the dry back cover construction of open caisson.
Wherein, measurement review includes the following steps: according to coordinate control point, height datum point, to open caisson Outside Dimensions into Row review;Control height is marked with red paint in open caisson surrounding, axial location is controlled by horizontal layout requirement setting open caisson center Point, while establishing plane survey control system;According to measurement of higher degree datum mark, measurement of higher degree control system is established, elevation is surveyed It leads near open caisson, and 4 temporary bench marks is set in open caisson surrounding, high process control is implemented to the whole process of well sinking.
Wherein, excavation of foundation pit includes the following steps: foundation pit by 1:1.5 gradient heavy excavation;When earth excavation depth is less than 6m When, it is excavated using digging machine;When cutting depth is greater than 6m, soil, daily earth excavation control amount are adopted using 2 fluid pressure type grab claws 800~1000m3, side slope and the reserved at least 30cm thickness of substrate are modified using hand excavation.
Wherein, caisson cutting edge support pad includes the following steps: that open caisson bed course adds concrete cushion to pour using in yellow ground base Method, bed course only do blade foot and bottom every brush interleaving agent on beam, concrete cushion, then install blade foot and borehole wall template on it, Casting concrete;Sand in sand bedding course selection is layered watering of vibrating with plate vibrator, controls dry weight > 1.56t/m3, ground will be clearly Reason leveling, if sand bedding course, makes top surface be maintained at the same horizontal plane, controls its absolute altitude within 10mm deviation with level, and Placing sand is tamped in its gap, with the compactness of cuttage detection sand bedding course;In one laminin concrete cushion of sand bedding course upper berth.
Wherein, when caisson structure makes, borehole wall production concreting is divided into 3 stages;Specifically include following two steps It is rapid:
S1. falsework makes: well body wallboard, ground beam blade foot are all made of combined type wooden model, and wooden model is using thick glued board, wood Shelves use flitch, and glued board wants straight flange system angle when making, and numbers, and are fixed with split bolt, bracket is set up using steel pipe feet hand Operating platform;It is padded under scaffold mobile jib with wooden unit or channel steel;
S2. concreting: pouring and smash use pumping, poker vibrator vibration compacting, conserves after casting and compacting of concrete, to mixed Watering is wet at solidifying soil covering.
Wherein, it cuts the earth to sink to including the following steps: that, according to rain pump room open caisson size, earth excavation is with mechanical excavation It is main, stage excavation, hand excavation's auxiliary;Wide earthen platform is stayed at blade foot, manually successively cutting;Method is to be layered in order gradually Toward blade foot direction skiving soil layer, when native ridge can't stop the extruding of blade foot and rupture, open caisson just breaks ground under Gravitative Loads sinking; It comprehensively, uniformly, is symmetrically carried out when cutting soil along blade foot direction, its uniform and stable is made to sink;Blade foot lower part cubic metre of earth is cleared up when digging; Soil is being taken from stopping at 20~30cm of projected depth, is sinking down into designed elevation according to self weight.
Wherein, the setting and processing of construction joint are such that construction joint using joint form;The borehole wall vertically tie up by secondary reinforcing bar Before bundle and casting and compacting of concrete, combines surface laitance layer at construction joint all to cut the old and new, expose aggregate, remove completely, it is wet After carry out disturbing concrete.
Wherein, the dry back cover construction of open caisson first does throwing rubble before including the following steps: back cover, and water filter well is arranged, and makes shaft bottom Water be all pooled in water filter well, be discharged with water pump;It will be washed at blade foot concrete dabbing before construction of bottom plates, then symmetrically A laminin concrete cushion uniformly is poured, after intensity reaches 30%, binds baseplate reinforcing bar, casting concrete bottom plate;It is cast in whole A open caisson area higher slice is carried out by four circumferential centers, and is made firm by ramming closely knit;During concrete curing 14d, in the sump of back cover In it is continual draw water, so that underplate concrete is not subject to hydraulic pressure, underplate concrete reaches design strength through maintenance and pump house is whole Structure all completes, top plate casting completion rear enclosed sump.
Beneficial effects of the present invention: using the above construction method be able to solve present in the construction of existing large-scale well-sinking The open caisson of soft layer prevents uneven subsidence in draining and non-drainage subsidence, dashes forward and sink, control heavy eventually and reduction to stratum The constructing technology problems such as disturbance effectively prevent the problems such as prominent heavy, super heavy, partially heavy, realize high-quality, efficient and controllable construction.
Specific embodiment
Below with reference to embodiment, the invention will be further described, but not as any limitation of the invention.
The specific implementation step and technical essential of large-scale well-sinking construction of the invention include following aspects:
1. open caisson pre-processing
1.1. measurement review
According to coordinate control point, height datum point, open caisson Outside Dimensions are checked, review the main contents include: it is heavy Well height, axial location equidimension deviation situation, and fill in setting-out list report management review.
Control height is marked with red paint in open caisson surrounding, axial location is controlled by horizontal layout requirement setting open caisson center It is processed, while establishing plane survey control system.
According to measurement of higher degree datum mark, measurement of higher degree control system is established, elevation survey is led near open caisson, and in open caisson 4 temporary bench marks are arranged in surrounding, implement high process control to the whole process of well sinking.
1.2. excavation of foundation pit
Foundation pit presses 1:1.5 gradient heavy excavation, natural ground elevation 5.00m, and it is 2.2m that open caisson, which plays heavy absolute altitude, digs depth and is 2.80m。
When earth excavation depth is less than 6m, excavated using EX-300 digging machine;When cutting depth is greater than 6m, using 2 1m3Fluid pressure type grab claw adopts soil, 800~1000m of daily earth excavation control amount3, side slope and substrate reserve 30cm thickness and use people Work excavates finishing.
1.3. caisson cutting edge support pad
Construction blade foot support pad at slope to absolute altitude 3.50m.
(1) blade foot supporting module: for this open caisson bed course using concrete cushion casting method is added in yellow ground base, bed course only does sword Then foot and bottom install blade foot and borehole wall template, casting concrete every brush interleaving agent on beam, concrete cushion on it.
(2) sand bedding course: according to the bearing capacity calculation in open caisson weight and bed course bottom ground, thickness takes 1m, and width is 5.0m, sand in selection are vibrated (thickness is less than 30cm) and are sprinkled water with plate vibrator layering, controls dry weight > 1.56t/m3, ground Clear up leveling, if sand bedding course, top surface made to be maintained at the same horizontal plane, with level control its absolute altitude 10mm deviation with It is interior, and placing sand is tamped in its gap, with the compactness of cuttage detection sand bedding course
(3) concrete cushion: the bearing area in order to expand caisson cutting edge reduces the compression to sand bedding course and saves sword The bed die of underfooting and the needs of formwork erection, in one layer of sand bedding course upper berth C15 plain concrete cushion layer, thickness 10cm, width is taken outside the borehole wall 28cm。
1.4. caisson structure
After the concrete cushion on sand bedding course reaches 70% intensity, according to its inner structural features, this engineering borehole wall system 3 stages are divided into as concreting.Production length is 5m for the first time, and it is 7.43m, third time production length that second, which makes length, Degree is 1.8m.
(1) falsework makes: well body wallboard, ground beam blade foot are all made of combined type wooden model, and the preparation of combined type wooden model is equal It is made by construction drawing and merogenesis height, wooden model uses 15mm thickness glued board, and Wooden Batten uses 35 × 85 flitches, 15mm thickness glued board system As when want straight flange to unite angle, it is assembled straight tight to guarantee form assembly, and number, split bolt is fixed, and bracket uses 48 steel pipe of Φ Foot hand sets up operating platform.Inside and outside scaffold building is constructed by operating instruction, sets diagonal brace and bridging, out-mould scaffold distance between tie rods is more 0.9 × 1.5m, in 1.8m, interior out-mould scaffold is padded under scaffold mobile jib with wooden unit or channel steel away from borehole wall 30cm for every layer of cross bar control, In order to avoid foot subordinate is heavy.
(2) concreting
It pours and smashes using pumping, poker vibrator vibration compacting, insert in process of vibrating and mention slowly fastly, mobile spacing is no more than shaking 1.5 times of tamper operating radius.It must not touch and hang template, reinforcing bar, built-in fitting.While every layer of presetting period is also controlled, every layer Casting and compacting of concrete controls within 0.5m, and uniformly upwards, forbids unilateral side to pour and smash, within 12 after casting and compacting of concrete hour in time Maintenance, it is wet to watering at concrete covering.
The seam crossing of two section concrete sets convex horizontal joint, and seam crossing is handled through dabbing and flushing, first spreads and concrete Novel concrete is poured again after interior slurry composition is one layer of mortar identical.
2. caisson sinking construction
2.1. it cuts the earth
According to rain pump room open caisson size, earth excavation is based on mechanical excavation, stage excavation, hand excavation's auxiliary.Often Layer is cut the earth with a thickness of 0.5m or so, and the earthen platform 1.2~1.5m wide is stayed at blade foot, manually successively cutting, everyone is responsible for 2~3m mono- Section.Method is layered in order gradually toward blade foot direction skiving soil layer, cuts 5~15cm every time, when native ridge can't stop squeezing for blade foot When pressing and rupturing, open caisson just breaks ground under Gravitative Loads sinking.It comprehensively, uniformly, symmetrically carries out, makes along blade foot direction when cutting soil Its uniform and stable is sunk.Blade foot lower part cubic metre of earth must be cleared up when digging.
When open caisson starts to sink and will be sink to designed elevation, periphery cutting depth is less than 30cm, avoids run-off the straight.Especially When within starting to sink to last 5m, plan-position and verticality will be paid special attention to keep correct for it, otherwise continue to sink It is not easy to adjust.Soil is being taken from 20~30cm of projected depth or so stopping, sinking down into designed elevation according to self weight.The soil dug out in open caisson Side transports to spoil ground with dump truck and stacks.
2.2. construction joint setting and processing
It is found according to previous engineering practice, construction joint is the weak link of open caisson leakage.Construction joint uses joint form. The borehole wall is vertically before the binding of secondary reinforcing bar and casting and compacting of concrete, it is necessary to and combine surface laitance layer at construction joint all to cut the old and new, Expose aggregate, removes completely, just can be carried out disturbing concrete after wet.
2.3. the dry back cover construction of open caisson
When open caisson sinks to designed elevation, sink through 2~3d stable, or through observing, adds up deflection in 8h and be not more than When 10mm, bottom sealing can be carried out.It is first done before back cover and throws rubble, and water filter well is arranged according to design requirement, make the water in shaft bottom It is all pooled in water filter well, is discharged with water pump, so that level of ground water be made to keep below bottom plate or less 100cm.It will before construction of bottom plates Washed at blade foot concrete dabbing, then symmetrically and evenly pour one layer 100 thick plain concrete cushion layer, intensity reach 30% with Afterwards, baseplate reinforcing bar, casting concrete bottom plate are bound.Pouring will be carried out in entire open caisson area higher slice by four circumferential centers, often Thickness 25cm, and make firm by ramming closely knit.It during concrete curing 14d, wants continual in the sump of back cover and draws water, keep bottom plate mixed Solidifying soil is not subject to hydraulic pressure, and underplate concrete reaches design strength and pump house entire infrastructure through maintenance and all completes, and top plate pours Sump could be closed after work.
3. open caisson construction difficult point and requirement
3.1. sink to tilting, displacement, the prevention and correction reversed
During well sinking, it sometimes appear that reinforce observing, find and adopt in time situations such as inclination, displacement, torsion Take measure.The possible cause generated to inclination has: the 1. soft or hard unevenness of soil property under blade foot;2. tearing blade foot poppet open, asymmetry is carried out, or It backfills not in time;3. it is uneven to cut the earth, make native face height great disparity in well;4. empty many under blade foot, make open caisson it is uneven suddenly under It is heavy;5. drainage sink, there is quicksand phenomenon in side in well;6. part is by ratchel or embedded puts;The outer spoir of well or construction lotus It carries and bias is generated to open caisson side.
It can be prevented for reason in operation.If open caisson has tilted, it can take and reinforce cutting the earth in the higher side of blade foot, And sandstone can be suitably backfilled in lower side, it is equipped with the outer jetting of well or partial eccentricity ballast when necessary, can all deflection be made to obtain It corrects.After its normotopia, then even laminating takes native sinking, if inclination is can to use wind due to being put by ratchel or damaged dirt Pick is broken into fritter taking-up.
Mostly since inclination causes, prevention displacement must avoid sinking under inclination conditions displacement producing cause, add Strong observation, timely correction inclination.Be displaced corrective action be usually it is intended that open caisson inclined in opposite directions, then along inclined direction under It is heavy, until when blade foot center and design centre position coincide, then inclination is corrected, the displacement generated because correcting inclined gravity effect can The side inclination for having intention displacement after correcting inclination, makes it generate displacement to displacement opposite direction and corrects.
It, can be by upper caused by well sinking generates the compound action that the reason of torsion is multiple different directions inclination and displacement Correction displacement is stated, method of tilting first corrects displacement, then corrects inclination, makes deviation within allowed band.
3.2. it prevents the super heavy measure of open caisson: 1. when open caisson is sink to close to designed elevation, splashing, slow down shoveling speed Degree;Increase the measure of borehole wall frictional resistance 2. can take to control;3. drainage sink can be taken and fill out concrete prefabricated board under caisson cutting edge The measure of block and throwing stone, it is super heavy to reach control open caisson.
3.3. bottom sealing safeguard against seepage: the joint treatment of bottom plate and the borehole wall is 1. carried out;2. pouring bottom plate coagulation One-time-concreting is completed when native, must not be stopped over, and avoids generating construction joint and causing leakage phenomenon;3. bottom plate and borehole wall junction Measures of preventing water is taken when necessary;4. open caisson be able to satisfy when anti-floating requires can packing ponding well, packing first cleans up, and packing must It closely knit must prevent from leaking.
3.4. prevent quicksand, gush soil, basement high measure: 1. to open caisson bottom progress compaction grouting: slip casting pitch of holes is 1.0m is arranged in blossom type.With the striaght cement suspension that the ordinary portland cement that strength grade is 42.5 stirs evenly, and mix Enter 2.0% waterglass coagulant.2. before excavation of foundation pit use deep-well precipitation, make water level be down to hole bottom surface below 0.5~ 1.0m.3. the gutter and sump in sinking watching in open caisson perform at any time with the sinking of open caisson, and ensure sump Always it is in lowest water level.4. first carrying out native shape before bottom sealing to arrange, it is allowed into pot bottom-shape, a steel is set at middle part and catchments Well is pooled to the water in shaft bottom all in sump, is discharged with water pump.
4. open caisson monitoring and protecting measure
Open caisson must carry out the sedimentation and torsion monitoring of overall process in construction.Monitoring is particularly significant, adequately Instruct caisson sinking construction, it is ensured that smoothly safety carries out for construction, and the measure of this engineering monitoring is as follows:
During well body sinking excavation construction, around foundation pit, the friendship of two axis and the borehole wall in length and breadth is mutually perpendicular to open caisson Four monitoring stations are arranged at position in point.After open caisson demoulding, between being popped up in length and breadth on the borehole wall of four instrument monitoring stations corresponding section It away from the line of ink marker for 200mm, on the outside of four datum marks of pilot measurement to foundation pit and is protected, the items before measuring, recording are original Numerical value, as the original foundation in monitoring from now on, to carry out analysis comparison.To control the inclined of well body during well sinking Tiltedly, torsional capacity.
Each monitoring station sets up a theodolite, is the monitoring according to progress well body torsional capacity with longitudinal line of ink marker on the borehole wall, It is compared and analyzed by the data that measurement obtains with original value, to control the torsional capacity of the borehole wall.Once torsional capacity closes on or surpasses Specification permissible value is crossed, must just be taken appropriate measures immediately.
Embodiment 1:
Hongqiao in Shanghai, east section, business district comprehensive reformation municipal administration conveyance system rainfall pumping station is mainly that a rain pump room is heavy Well.Open caisson is made having a size of 30.6m × 28.3m, high 14.23m using 3 times, 2 sinkings, and production height is for the first time 5m, first time submergence depth are 5m;Second of production height is 7.43m, then carries out second of sinking, depth 6.73m;Third Secondary production cover board is 1.8m.Well sinking uses drainage sink, takes soil using fluid pressure type grab claw, and well sinking uses afterwards in place Dry back cover.
It is above specific application example of the invention, there are other embodiments of the invention, all to use equivalent replacement Or the technical solution that equivalent transformation is formed, it all falls within protection scope of the presently claimed invention.

Claims (8)

1. a kind of large-scale well-sinking construction method, it is characterised in that: include the steps that open caisson pre-processing and caisson sinking construction;Its In, open caisson pre-processing includes measurement review, excavation of foundation pit, caisson cutting edge support pad and caisson structure production;Well sinking is applied Work includes cut the earth sinking, the setting of construction joint and processing and the dry back cover construction of open caisson.
2. large-scale well-sinking construction method according to claim 1, it is characterised in that the measurement review includes the following steps: According to coordinate control point, height datum point, open caisson Outside Dimensions are checked;Control height is marked with red paint in open caisson surrounding Degree, axial location are arranged open caisson center control point by horizontal layout requirement, while establishing plane survey control system;According to height Journey datum mark establishes measurement of higher degree control system, elevation survey is led near open caisson, and be arranged 4 in open caisson surrounding and face When bench mark, high process control is implemented to the whole process of well sinking.
3. large-scale well-sinking construction method according to claim 1, it is characterised in that the excavation of foundation pit includes the following steps: Foundation pit presses 1:1.5 gradient heavy excavation;When earth excavation depth is less than 6m, excavated using digging machine;When cutting depth is greater than 6m, Soil, 800~1000m of daily earth excavation control amount are adopted using 2 fluid pressure type grab claws3, side slope and substrate reserve at least 30cm Thickness is modified using hand excavation.
4. large-scale well-sinking construction method according to claim 1, it is characterised in that the caisson cutting edge support pad includes as follows Step: for open caisson bed course using concrete cushion casting method is added in yellow ground base, bed course only does blade foot and bottom every beam, concrete mats Then brush interleaving agent on layer installs blade foot and borehole wall template, casting concrete on it;Sand in sand bedding course selection, is shaken with plate Dynamic device is layered watering of vibrating, and controls dry weight > 1.56t/m3, ground will clear up leveling, if sand bedding course, top surface be made to be maintained at same water In plane, its absolute altitude is controlled within 10mm deviation with level, and placing sand is tamped in its gap, detect sand pad with cuttage The compactness of layer;In one laminin concrete cushion of sand bedding course upper berth.
5. large-scale well-sinking construction method according to claim 1, it is characterised in that when the caisson structure makes, borehole wall system 3 stages are divided into as concreting;Specifically include following two steps:
S1. falsework makes: well body wallboard, ground beam blade foot are all made of combined type wooden model, and wooden model is adopted using thick glued board, Wooden Batten With flitch, glued board wants straight flange system angle when making, and numbers, and is fixed with split bolt, bracket sets up operation using steel pipe feet hand Platform;It is padded under scaffold mobile jib with wooden unit or channel steel;
S2. concreting: pouring and smash use pumping, poker vibrator vibration compacting, conserves after casting and compacting of concrete, to concrete It waters at covering wet.
6. large-scale well-sinking construction method according to claim 1, it is characterised in that the shoveling sinking includes the following steps: According to rain pump room open caisson size, earth excavation is based on mechanical excavation, stage excavation, hand excavation's auxiliary;It is stayed at blade foot Wide earthen platform, manually successively cutting;Method is layered in order gradually toward blade foot direction skiving soil layer, when native ridge can't stop blade foot Extruding and when rupturing, open caisson just breaks ground under Gravitative Loads sinking;When cutting soil along blade foot direction comprehensively, uniformly, symmetrically into Row makes its uniform and stable sink;Blade foot lower part cubic metre of earth is cleared up when digging;Soil is being taken from stopping at 20~30cm of projected depth, according to Self weight sinks down into designed elevation.
7. large-scale well-sinking construction method according to claim 1, it is characterised in that the setting and processing of the construction joint be Such: construction joint uses joint form;The old and new vertically before the binding of secondary reinforcing bar and casting and compacting of concrete, are combined construction joint by the borehole wall Place's surface laitance layer is all cut, and exposes aggregate, is removed completely, is carried out disturbing concrete after wet.
8. large-scale well-sinking construction method according to claim 1, it is characterised in that the dry back cover construction of open caisson includes such as Lower step: it is first done before back cover and throws rubble, and water filter well is set, be pooled to the water in shaft bottom all in water filter well, be discharged with water pump;Bottom It will be washed at blade foot concrete dabbing before plate construction, then symmetrically and evenly pour a laminin concrete cushion, intensity reaches After 30%, baseplate reinforcing bar, casting concrete bottom plate are bound;Be cast in entire open caisson area higher slice by four circumferential centers into Row, and make firm by ramming closely knit;It is continual in the sump of back cover to draw water during concrete curing 14d, hold underplate concrete not By hydraulic pressure, underplate concrete reaches design strength and pump house entire infrastructure through maintenance and all completes, top plate casting completion rear enclosed Sump.
CN201811586980.2A 2018-12-25 2018-12-25 Large-scale well-sinking construction method Pending CN109706952A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111042172A (en) * 2020-01-16 2020-04-21 中建七局安装工程有限公司 Construction method for large-volume special-shaped open caisson foundation
CN112695787A (en) * 2020-12-25 2021-04-23 中国水利水电第七工程局有限公司 Sinking soil taking construction method for open caisson at first section
WO2021243997A1 (en) * 2020-06-02 2021-12-09 江西基业科技集团有限公司 Self-sinking-type deep foundation pit retaining wall structure and construction method for underground space structure

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111042172A (en) * 2020-01-16 2020-04-21 中建七局安装工程有限公司 Construction method for large-volume special-shaped open caisson foundation
WO2021243997A1 (en) * 2020-06-02 2021-12-09 江西基业科技集团有限公司 Self-sinking-type deep foundation pit retaining wall structure and construction method for underground space structure
CN112695787A (en) * 2020-12-25 2021-04-23 中国水利水电第七工程局有限公司 Sinking soil taking construction method for open caisson at first section

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