CN105332382B - Adjacent river foundation ditch builds island cofferdam clay water stop construction method - Google Patents
Adjacent river foundation ditch builds island cofferdam clay water stop construction method Download PDFInfo
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- CN105332382B CN105332382B CN201510717000.8A CN201510717000A CN105332382B CN 105332382 B CN105332382 B CN 105332382B CN 201510717000 A CN201510717000 A CN 201510717000A CN 105332382 B CN105332382 B CN 105332382B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/02—Restraining of open water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/02—Restraining of open water
- E02D19/04—Restraining of open water by coffer-dams, e.g. made of sheet piles
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Abstract
Island cofferdam clay water stop construction method is built the invention provides a kind of adjacent river foundation ditch, belongs to river course deep-foundation pit engineering water-stop technology field, including：Build island cofferdam construction：Outside foundation ditch predeterminated position, construction cofferdam；Clay seepproof screen is constructed：The construction clay seepproof screen between foundation ditch predeterminated position and the cofferdam；Excavation of foundation pit：Excavated in foundation ditch predeterminated position, obtain foundation ditch；Internal model supporting box is lifted：The internal model supporting box of pre-production is lifted into the predeterminated position to cushion cap foundation ditch, and the internal model supporting box is positioned and reinforced；Bearing platform construction：Poured in foundation ditch and obtain cushion cap；Internal model supporting box is removed, cofferdam demolition and river course are cleared up.The construction method is by setting clay seepproof screen, using the physical characteristic that clay block-water performance is high and plasticity is strong, meet neighbouring river course cushion cap foundation ditch sealing requirement, reach foundation ditch water-stagnating effect, lifted by internal model supporting box, Safety Construction of Deep Foundation Pit stabilization is ensured, while internal model supporting box can be used as cushion cap template.
Description
Technical field
The present invention relates to river course deep-foundation pit engineering water-stop technology field, build island in particular to a kind of adjacent river foundation ditch and enclose
Weir clay water stop construction method.
Background technology
Current small and medium river channel bridge accounts for more than the 85% of existing highway bridge total amount.Korneforos cushion cap foundation ditch and neighbouring river cushion cap base
Hole is very common, and rapid river not only influences cushion cap base pit dewatering efficiency, and building enclosure can be caused to undertake larger oozing
Saturating pressure, is that deep foundation pit precipitation increased certain technical difficulty.
The key of neighbouring river course Deep Foundation Works Construction Technology is patching, river course rich groundwater and buried depth is shallow, base
Hole support engineering often brings certain difficulty of construction because of problem of groundwater.Country construction project field is adjacent to river course base at present
Hole water-stop technology, mainly there is three kinds of processing methods：One kind is by rotary churning pile water stopping curtain；Second is added using two-stage dewatering well
Water seal curtain；The third is steel sheet-pile cofferdam sealing construction.But above-mentioned three kinds of water-stopping methods, its scope of application all has very big
Limitation, and cycle engineering time is long, construction cost is big.It is not suitable for small-sized river course and the less deep basal pit work of foundation ditch size
Journey.
The content of the invention
Island cofferdam clay water stop construction method is built the invention provides a kind of adjacent river foundation ditch, it is intended to improve above mentioned problem.
What the present invention was realized in：
A kind of adjacent river foundation ditch builds island cofferdam clay water stop construction method, including：
Build island cofferdam construction：Outside cushion cap foundation ditch predeterminated position, construction cofferdam；
The island cofferdam construction of building includes outside steel-wire stone wall construction；
The outside steel-wire stone wall construction：Using building stones to wire basket filling dress cage, wire basket is from outside to inside successively
Lay, form outside steel-wire stone wall；
The island cofferdam construction of building is filled including cofferdam；
Fill in the cofferdam：Slag is built in the inner side use of the outside steel-wire stone wall to fill, form cofferdam；
Inner side steel-wire stone wall construction：The inner side steel-wire stone wall construction it is described build island cofferdam construction after；
The inner side steel-wire stone wall construction：Between cushion cap foundation ditch predeterminated position and cofferdam, wire basket is filled using building stones is filled
Cage, wire basket is successively laid from the inside to the outside, forms inner side steel-wire stone wall；
Clay seepproof screen is constructed：Between cushion cap foundation ditch predeterminated position and the cofferdam and the inner side steel-wire stone wall
The position construction clay seepproof screen in outside；
Excavation of foundation pit：Excavated in cushion cap foundation ditch predeterminated position, obtain cushion cap foundation ditch；
Internal model supporting box is lifted：Using being lifted to cushion cap base as the internal model supporting box of cushion cap template for pre-production
Predeterminated position in hole, and the internal model supporting box is positioned and reinforced；
Cushion cap retaining wall is poured：After the completion of internal model supporting box lifting, in the internal model supporting box and cushion cap base
Casting concrete between the inwall in hole, obtains cushion cap retaining wall；
Bearing platform construction：Poured in cushion cap foundation ditch and obtain cushion cap；
Internal model supporting box is removed, cofferdam demolition and river course are cleared up.
Further, the clay seepproof screen construction：Clay is packed, and clay bag is transported to the default position of cushion cap foundation ditch
Filling in groove of being formed between cofferdam is put, clay bag layering is piled up, laid and do not pack between adjacent two layers clay bag layer
Argillic horizon, clay bag layer and argillic horizon form clay seepproof screen.
Seepproof screen is made using clay, block-water performance is high and plasticity is strong, substantially reduces the infiltration in Excavation Process.
By outside steel-wire stone wall of constructing, the drainage that blocks water can be played a part of, and water resistant stream scouring capability is strong,
For excavation of foundation pit provides good construction basis, while ensure that the stabilization after excavation of foundation pit.
By inner side steel-wire stone wall of constructing, reinforcement effect is played to cushion cap foundation ditch periphery, it is ensured that Excavation Process
Middle cofferdam stabilization.
Further, the internal model supporting box includes multiple side plates, and multiple side plates join end to end, and to surround upper and lower ends equal
The casing of opening, is provided with triangular support bracket between two side plates of arbitrary neighborhood, be provided between two relative side plates
Horizontal shore.
By setting triangular support bracket and horizontal shore on internal model supporting box, internal model supporting box is enhanced to holding
The inner support effect in stylobate hole, makes structure more firm.
Further, the excavation of foundation pit includes that foundation ditch is cut the earth and withdrawal；
The foundation ditch is cut the earth：Cut the earth in cushion cap foundation ditch predeterminated position, obtain the cushion cap foundation ditch of pre-set dimension；
The withdrawal：During foundation ditch shoveling, the water in cushion cap foundation ditch is pumped.
By withdrawal, the water in cushion cap foundation ditch is pumped, to carry out bearing platform construction in cushion cap foundation ditch.
Further, the excavation of foundation pit also includes foundation ditch desilting；
The foundation ditch desilting：After the completion of foundation ditch shoveling, by the silt displacement in cushion cap foundation ditch, sludge is discharged.
The mud in cushion cap foundation ditch is removed, to carry out bearing platform construction in cushion cap foundation ditch.
Further, the excavation of foundation pit also includes back cover cushion construction；
The back cover cushion construction：After the completion of the foundation ditch desilting, back cover bed course is poured in cushion cap bottom of foundation ditch.
By pouring back cover bed course, bearing platform construction is convenient for, while ensureing suspended deck structure size specification.
The beneficial effects of the invention are as follows：By setting clay seepproof screen, neighbouring river course foundation ditch sealing requirement is met well,
Clay not only can be very good to reduce river infiltration, can also maintain the stabilization of the cofferdam soil body.And reduce or cut-off foundation ditch oozes
Water and underground water are contacted with river course, reach foundation ditch water-stagnating effect, are lifted by internal model supporting box, it is ensured that deep foundation pit construction
Safety and stability, while internal model supporting box can be used as cushion cap template.The construction method drops compared with traditional handicraft (such as steel sheet pile)
Low difficulty of construction, it is simple and easy to apply, accelerate construction speed；Material is greatly saved, the duration is shortened, has saved and has been constructed into
This；Construction equipment less investment, foundation pit supporting construction stability is high, and construction operation is convenient.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, below will be attached to what is used needed for embodiment
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, thus be not construed as it is right
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this
A little accompanying drawings obtain other related accompanying drawings.
Fig. 1 is the constructing structure signal that adjacent river foundation ditch provided in an embodiment of the present invention builds island cofferdam clay water stop construction method
Figure；
Fig. 2 is the constructing structure section that adjacent river foundation ditch provided in an embodiment of the present invention builds island cofferdam clay water stop construction method
Schematic diagram；
Fig. 3 is the internal model support case that adjacent river foundation ditch provided in an embodiment of the present invention is built in the clay water stop construction method of island cofferdam
The plan of body；
Fig. 4 is the internal model support case that adjacent river foundation ditch provided in an embodiment of the present invention is built in the clay water stop construction method of island cofferdam
The elevation of body；
Fig. 5 is the internal model support case that adjacent river foundation ditch provided in an embodiment of the present invention is built in the clay water stop construction method of island cofferdam
The side elevational view of body；
Fig. 6 is the cross-bridges that adjacent river foundation ditch provided in an embodiment of the present invention builds the cushion cap in the clay water stop construction method of island cofferdam
To sectional drawing；
Fig. 7 is that the cushion cap that adjacent river foundation ditch provided in an embodiment of the present invention is built in the clay water stop construction method of island cofferdam is excavated
Plan；
Fig. 8 is the vertical bridge that adjacent river foundation ditch provided in an embodiment of the present invention builds the cushion cap in the clay water stop construction method of island cofferdam
To sectional drawing；
Fig. 9 is the signal that adjacent river foundation ditch provided in an embodiment of the present invention builds the cushion cap in the clay water stop construction method of island cofferdam
Figure；
Figure 10 builds the technique stream of island cofferdam clay water stop construction method for adjacent river foundation ditch that second embodiment of the invention is provided
Cheng Tu.
Figure acceptance of the bid note is respectively：
Cofferdam 101；Clay seepproof screen 102；Cushion cap foundation ditch 103；Cushion cap 104；Outside steel-wire stone wall 105；Inner side steel
Silk gabion wall 106；Internal model supporting box 107；Side plate 108；Triangular support bracket 109；Horizontal shore 110；River course 111；River
Dike barricade 112；
Build island cofferdam construction S1001；Clay seepproof screen construction S1002；Excavation of foundation pit S1003；Bearing platform construction S1004；It is interior
Mould supporting box is removed, cofferdam demolition and river course clear up S1005；Preparation of construction S1006；Internal model supporting box makes S1007；It is interior
Mould supporting box lifts S1008.
Specific embodiment
The key of neighbouring river course Deep Foundation Works Construction Technology is patching, river course rich groundwater and buried depth is shallow, base
Hole support engineering often brings certain difficulty of construction because of problem of groundwater.Country construction project field is adjacent to river course base at present
Hole water-stop technology, mainly there is three kinds of processing methods：One kind is by rotary churning pile water stopping curtain；Second is added using two-stage dewatering well
Water seal curtain；The third is steel sheet-pile cofferdam sealing construction.But above-mentioned three kinds of water-stopping methods, its scope of application all has very big
Limitation, and cycle engineering time is long, construction cost is big.It is not suitable for small-sized river course and the less deep basal pit work of foundation ditch size
Journey.
In consideration of it, designer of the invention is by long-term exploration and trial, and multiple experiment and effort, constantly
Reform and innovation, devise a kind of adjacent river foundation ditch and build island cofferdam clay water stop construction method, by setting clay seepproof screen 102, very
The sealing requirement of neighbouring 111 cushion cap foundation ditch of river course 103 is met well, and clay not only can be very good to reduce river infiltration, can be with
Maintain the stabilization of the soil body of cofferdam 101.And reduce or cut-off cushion cap foundation ditch 103 seeps water and underground water and river course 111 are contacted,
The water-stagnating effect of cushion cap foundation ditch 103 is reached, S1008 is lifted by internal model supporting box, it is ensured that the deep construction safety of cushion cap foundation ditch 103 is steady
It is fixed, while internal model supporting box 107 can be used as cushion cap template.
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Present invention implementation generally described and illustrated in accompanying drawing herein
The component of example can be arranged and designed with a variety of configurations.Therefore, reality of the invention below to providing in the accompanying drawings
The detailed description for applying example is not intended to limit the scope of claimed invention, but is merely representative of selected implementation of the invention
Example.Based on the embodiment in the present invention, what those of ordinary skill in the art were obtained under the premise of creative work is not made
Every other embodiment, belongs to the scope of protection of the invention.
First embodiment
Fig. 1~Fig. 9 is referred to, a kind of adjacent river foundation ditch is present embodiments provided and is built island cofferdam clay water stop construction method, fitted
For medium or smallsized river, constructed using the bridge neighbour river cushion cap 104 of building island cofferdam and korneforos cushion cap foundation ditch 103.The construction method
Including：
Build island cofferdam construction S1001：Outside the predeterminated position of cushion cap foundation ditch 103, construction cofferdam 101.
Clay seepproof screen construction S1002：The construction clay seepproof screen between the predeterminated position of cushion cap foundation ditch 103 and cofferdam 101
102。
Excavation of foundation pit S1003：Excavated in the predeterminated position of cushion cap foundation ditch 103, obtain cushion cap foundation ditch 103.
Internal model supporting box lifts S1008：The internal model supporting box 107 of pre-production is lifted to cushion cap foundation ditch 103
Predeterminated position, and internal model supporting box 107 is positioned and reinforced.
Bearing platform construction S1004：Poured in cushion cap foundation ditch 103 and obtain cushion cap 104.
Internal model supporting box remove, cofferdam demolition and river course cleaning S1005, including clay seepproof screen 102 dismounting.Remove
Internal model supporting box 107, can reduce the waste of material in work progress, and material saving, the tank material pulled down can Reusability.
The both sides in river course 111 are river levee barricade 112, and the river levee barricade 112 of side is constructed wherein.
The adjacent river foundation ditch that the present embodiment is provided builds island cofferdam clay water stop construction method by setting clay seepproof screen 102,
The sealing requirement of 111 cushion cap foundation ditch of neighbouring river course 103 is met well, and clay not only can be very good to reduce river infiltration, may be used also
To maintain the stabilization of the soil body of cofferdam 101.And reduce or cut-off cushion cap foundation ditch 103 seep water and underground water and river course 111 connection
System, reaches the water-stagnating effect of cushion cap foundation ditch 103, by internal model supporting box 107, it is ensured that the deep construction safety of cushion cap foundation ditch 103 stabilization,
Internal model supporting box 107 can be used as cushion cap template simultaneously.The construction method is reduced and applied compared with traditional handicraft (such as steel sheet pile)
Work difficulty, it is simple and easy to apply, accelerate construction speed；Material is greatly saved, the duration is shortened, construction cost has been saved；Apply
Construction equipment less investment, the supporting construction stability of cushion cap foundation ditch 103 is high, and construction operation is convenient.
On the basis of the adjacent river foundation ditch that above-described embodiment is provided builds the technical scheme of island cofferdam clay water stop construction method,
Further, building island cofferdam construction S1001 includes that outside steel-wire stone wall construction and cofferdam are filled.
Outside steel-wire stone wall construction：Using building stones to wire basket filling dress cage, wire basket is successively laid from outside to inside,
Steel-wire stone wall 105 on the outside of being formed.
Fill in cofferdam：Filled using building slag in the inner side of outside steel-wire stone wall 105, form cofferdam 101.
Steel-wire stone wall 105 on the outside of by constructing, can play a part of the drainage that blocks water, and water resistant stream scouring capability
By force, for excavation of foundation pit S1003 provides good construction basis, while ensure that the stabilization after excavation of foundation pit S1003.
The construction method also includes inner side steel-wire stone wall construction, and inner side steel-wire stone wall construction is applied building island cofferdam
After work S1001.
Inner side steel-wire stone wall construction：Between the predeterminated position of cushion cap foundation ditch 103 and cofferdam 101, using building stones to steel
Silk cage filling dress cage, wire basket is successively laid from the inside to the outside, steel-wire stone wall 106 on the inside of formation.
Steel-wire stone wall 106 on the inside of by constructing, plays reinforcement effect, it is ensured that foundation ditch is opened to the periphery of cushion cap foundation ditch 103
Dig the stabilization of cofferdam 101 during S1003.
Clay seepproof screen construction S1002：In the outside of inner side steel-wire stone wall 106 construction clay seepproof screen 102.By clay
Pack, and by clay bag be transported between the predeterminated position of cushion cap foundation ditch 103 and cofferdam 101 formed fill in groove, by clay
Bag layering is piled up, and the argillic horizon not packed is laid between adjacent two layers clay bag layer, and clay bag layer forms clay and stops with argillic horizon
Waterwall 102.
Seepproof screen is made using clay, block-water performance is high and plasticity strong, during substantially reducing excavation of foundation pit S1003
Infiltration.
Excavation of foundation pit S1003 includes that foundation ditch is cut the earth and withdrawal.
Foundation ditch is cut the earth：Cut the earth in the predeterminated position of cushion cap foundation ditch 103, obtain the cushion cap foundation ditch 103 of pre-set dimension.
Withdrawal：During the shoveling of cushion cap foundation ditch 103, the water in cushion cap foundation ditch 103 is pumped.
By withdrawal, the water in cushion cap foundation ditch 103 is pumped, to carry out bearing platform construction in cushion cap foundation ditch 103
S1004。
Excavation of foundation pit S1003 also includes foundation ditch desilting.
Foundation ditch desilting：After the completion of the shoveling of cushion cap foundation ditch 103, by the silt displacement in cushion cap foundation ditch 103, sludge is discharged.
Excavation of foundation pit S1003 also includes back cover cushion construction.
Back cover cushion construction：After the completion of foundation ditch desilting, back cover bed course is poured in the bottom of cushion cap foundation ditch 103.
The mud in cushion cap foundation ditch 103 is removed, and pours back cover bed course, be convenient for bearing platform construction S1004, while protecting
The card physical dimension specification of cushion cap 104.
The construction method also includes that internal model supporting box lifts S1008, and cushion cap foundation ditch 103 is obtained in excavation of foundation pit S1003
Afterwards.
Internal model supporting box lifts S1008：The internal model supporting box 107 of pre-production is lifted to cushion cap foundation ditch 103
Predeterminated position, and internal model supporting box 107 is positioned and reinforced.
Lifting internal model supporting box 107, realizes the inner support of cushion cap foundation ditch 103 in cushion cap foundation ditch 103, has consolidated cushion cap
Foundation ditch 103, it is ensured that the personal safety of workmen during bearing platform construction S1004；Lifting internal model supporting box 107 simultaneously can make
It is the template of cushion cap retaining wall, to carry out bearing platform construction S1004.
Preferably, internal model supporting box 107 includes multiple side plates 108, multiple side plates 108 join end to end and surround upper and lower two
The casing that is open of end, is provided with triangular support bracket 109 between two side plates 108 of arbitrary neighborhood, relative two side plates 108 it
Between be provided with horizontal shore 110.
By setting triangular support bracket 109 and horizontal shore 110 on internal model supporting box 107, internal model branch is enhanced
Support casing 107 makes structure more firm the inner support effect of cushion cap foundation ditch 103.
The construction method is also poured including cushion cap retaining wall：After the completion of internal model supporting box lifting S1008, in internal model support
Casting concrete between the inwall of casing 107 and cushion cap foundation ditch 103, obtains cushion cap retaining wall.
Second embodiment
Fig. 1~Figure 10 is referred to, a kind of adjacent river foundation ditch is present embodiments provided and is built island cofferdam clay water stop construction method, should
Construction method is comprised the following steps that：
Preparation of construction S1006：
Construction technology prepares：According to the physical dimension size of cushion cap 104 and the position in river course 111, cofferdam 101 is designed,
Designed including filling material form, the physical dimension of cofferdam 101, internal model supporting box 107 and Specific construction technical requirements formulation.
Material prepares：The material of cofferdam 101 is mainly drawing house youngster steel-wire stone, builds slag, cobble, build island material for sand gravel,
Sealing clay, build slag etc..
Machinery prepares：According to this engineering of cofferdam 101 and the quantities of cushion cap foundation ditch 103 and specific construction period, reasonable disposition
Plant equipment.
Preparation at the construction site：By the use of the two sides road of river course 111 as temporary construction road, for various transport of materials and construction
The discrepancy of vehicle.Island position is built according to cofferdam 101, river levee existing utility is investigated, and take safeguard measure.Set according to site machinery
It is standby to be equipped with rational temporary electrical power supply.
Build island cofferdam construction S1001：
Construction block water before drainage：Analyzed according to field investigation and actual conditions, first carry out outside steel-wire stone wall construction,
So as to effectively prevent water burst, seepage problem.
Wire basket filling dress cage is first carried out using cobble and gravel, peripheral steel wire cage arrangement coordinates artificial using long-armed digging machine
Put, put requirement smooth-going, put order first to prolong one circle of the outer laying in cofferdam 101, after ground floor is put and finished, enter again successively
The row second layer and follow-up level wire basket are laid.Preferably, wire basket specification is：2m long, 1m wide, 1m high, mesh be 8cm ×
10cm, mesh wire diameter is 2.6mm.Steel-wire stone wall 105 on the outside of being formed.Peripheral steel wire gabion sets height and combines river depth
Determine higher than water surface elevation with riverbed sludge thickness degree and the design of cofferdam 101.
Fill in cofferdam：Carry out building slag on the inside of wall using long-armed digging machine while steel-wire stone 105 construction of wall in outside
Cofferdam is filled, while the stabilization of steel-wire stone wall 105 on the outside of ensuring.Depth is filled in cofferdam 101, is become silted up with river depth and riverbed
Mud layer thickness and cofferdam 101 are designed and are determined higher than water surface elevation.
Inner side steel-wire stone wall construction：After outside steel-wire stone wall 105 and cofferdam filling construction are finished, by surveying
Amount setting-out determines the size of cushion cap foundation ditch 103 and the facial plane position of cofferdam 101.Marked according to the projected depth of cushion cap 104 and cushion cap 104
Height, the steel-wire stone wall 106 on the inside of the periphery of cushion cap foundation ditch 103 3m scopes are set, its depth of burying exceedes the bottom 80cm of cushion cap 104
And it is higher by the stabilization of cofferdam 101 during water surface 1m ensures excavation of foundation pit S1003.
Clay seepproof screen construction S1002：
It is 0Khm/d using clay horizontal permeation after the overall construction of cofferdam 101 in stylobate of entertaining hole 103 is finished, vertical infiltration
It is 0Kvm/d, the physical characteristic that block-water performance is high and plasticity is strong fills one clay in the outside of inner side steel-wire stone wall 106
Seepproof screen 102, reduces the infiltration during excavation of foundation pit S1003.After clay is marched into the arena, manually being aided with machinery enters luggage for arrangement immediately
Bag, and set it is interim stack point, be transported through to groove is filled by machinery when to be onstructed, layering is piled up, and tiles one between every layer
The clay layer that layer is not packed.
Clay seepproof screen 102 fills length and width and is determined according to cofferdam 101 and the size of cushion cap 104.Depth is filled to exceed
The bottom 80cm of cushion cap 104 is simultaneously higher by water surface 1m.Placement in layers and compacting are carried out to filling clay during clay filling, to ensure to glue
Soil layer stabilization.In compacting process, strict control compacting equipment pressing power, it is to avoid in construction to periphery and outside steel wire stone
Cage wall 105 is damaged and displacement.
Internal model supporting box makes S1007：
According to the physical dimension of bridge bearing platform 104 and the internal model supporting box of the depth of burying of cushion cap 104 design cushion cap foundation ditch 103
107 physical dimension.With the physical dimension of cushion cap 104：As a example by 650cm long × 250cm wide × 220cm high, the internal model of cushion cap foundation ditch 103
Each side considers the lifting construction error of 20cm to the physical dimension of supporting box 107 on its basis, its size should be 670cm long ×
270cm wide × 240cm high, template thickness of slab uses 10mm steel plates, and floor is done using 10cm × 10cm channel-section steels.
Internal model supporting box 107 is made using the waste and old template splicing that site construction is produced, and chi is designed according to form box
It is very little, the piece number of required steel plate is calculated, it must be checked before spelling group, measured, classified, be numbered, using clod wash, heat is struck
(temperature is no more than 800~1000 DEG C), the method such as soldering, riveting are mended, cut off, spreading carries out template splicing trimming.While every mould
Plate butt welding length is equal with its plate length of side, during welding, presss from both sides flat with firm fixture, in order to avoid deformation, in welding, first butt welding,
Reinforcement of weld plate, hole for hoist must be made to internal model supporting box lifting S1008 suspension centres again.
Its plan-position and perpendicularity should be checked in welding process, should be to give correction when finding to incline；Casing has made
Cheng Hou, in cabinet wall point two-layer, spaced set triangular support bracket 109 and horizontal shore 110.The support rod member of support frame
Using the steel pipes of Φ 5, support rod member termination is welded to connect bar and jacking, for being welded with cabinet wall；During support frame erecting and welding,
Notice that absolute altitude is consistent, it is ensured that support frame is installed parallel with each side of casing.
Excavation of foundation pit S1003：
Foundation ditch is cut the earth：After the completion of cofferdam 101 is constructed, carried out using long-armed digging machine, cushion cap foundation ditch 103 must not push up and stack equipment
Deng debris, and there should be seepage control measure.Various preloadings (spoir and placing of material) highly must not exceed 1.5m, and away from hole, edge should be not less than
5m, machinery and locomotive passage should be not less than 2.0m away from hole edge.The earthwork is transported to regulation spoil ground by night in time.
Excavate cushion cap foundation ditch 103 when, as far as possible by pier cushion cap foundation ditch 103 cubic metres of earth once excavate.Dig to the soil of absolute altitude
Matter cushion cap foundation ditch 103 must not for a long time expose, disturbs or soak.In digging process, it is necessary to check the stable state of side slope at any time,
Side slope is according to 1：0.75 slope.
Withdrawal：Cushion cap foundation ditch 103 draws water when excavating, and sends special messenger to observe the dam body situation of cofferdam 101 when drawing water, and such as sends out
The abnormal conditions such as raw dam body depression, slip need to take measures in time, consolidation process.Basic initial stage draining should not be too fast, and draining is too
It is unfavorable for the stabilization of cofferdam 101 soon.Cofferdam 101 is compacted in time after water outlet；It was found that infiltration stops pumping, reinforcing cofferdam 101, safeguards
The safety of cofferdam 101.
Foundation ditch desilting：After the completion of excavation of foundation pit S1003, cushion cap foundation ditch 103 is carried out in time using hand fit's excavator
Desilting is slagged tap.
Back cover cushion construction：After the completion of desilting is slagged tap, 20cm thickness C20 concrete is poured to the bottom of cushion cap foundation ditch 103, in time
Back cover is carried out to cushion cap foundation ditch 103；Using pumping, concrete construction is carried out back cover concrete by, is pushed away from one side to another side during back cover
Enter, but guarantee is continuous, uninterrupted, do not stay seam, disposable completion.The top surface absolute altitude of bottom concrete must not be higher than cushion cap bed course
Bottom designed elevation, back cover concrete top surface ensures substantially smooth.Using manually pile crown is abolished, cushion cap foundation ditch 103 is recalled with 25T cranes,
After with the excavation crusher machine with crushing head, then spoil ground is transported to slag waggon；After the completion of cushion cap foundation ditch 103 is cleared up, check again for
Elevation, pours the C15 cushion cap blinding concretes of 10cm immediately after meeting the requirements.Cushion layer concrete top surface absolute altitude is not above design cushion cap
104 bottom absolute altitudes, after the cushion construction of cushion cap foundation ditch 103 is complete, calibrate pier shaft cross hairs, and cause outside cushion cap foundation ditch 103 with the line of ink marker
Side, and using rebar standardses stake positioning on cofferdam 101.So that the lifting of internal model supporting box 107 is in place.
Internal model supporting box lifts S1008：
Back cover blinding concrete intensity reaches the 85% of design strength, internal model supporting box lifting S1008 is carried out, before lifting
Carry out body structure size, suspension centre welding and the delineation line of back cover bed course cushion cap 104 check to ensure that Hoisting Security and
Lifting accuracy in place.
After the internal model supporting box of cushion cap 104 lifting S1008 is finished, lifted by cross searching ray examination in place accurate
Degree, is adjusted in time if any deviation.Lifting it is in place it is errorless after carry out Template Location and reinforcing.
Bearing platform construction S1004：
Cushion cap retaining wall is poured：After the positioning of internal model supporting box 107 is reinforced, the retaining wall of cushion cap 104 is carried out using mixed mud pump truck
Concreting, treats that cushion cap breast wall concrete intensity reaches more than the 85% of design strength, can remove internal model supporting box
107。
Casing carries out the reinforcement fabrication of cushion cap 104 after the completion of removing, during reinforcement fabrication to each length of straigh line of reinforcing bar,
The strict tolerances such as transfer angle, crotch radius and straight segment length, so as to ensure correct position of the reinforcing bar in cushion cap 104
Put.The inspection of steel reinforcement bars of cushion cap 104 carries out the concrete pouring construction of cushion cap 104 after checking and accepting, strict control coagulation soil property in work progress
Measure and vibrate frequency, it is ensured that concrete pouring quality.After cushion cap 104 is poured, the debris such as the soil of surface adhesion are rinsed out in time.
Steel bar corrosion is prevented foot stall steel muscle swabbing mud is exposed, splice is protected in splice band plastic wire cap protective case
Shield.
Internal model supporting box is removed, cofferdam demolition and river course clear up S1005：
After the completion of construction, internal model supporting box 107 is removed, in time by the orderly release cofferdam 101 in upstream to downstream and clear
Reason river course 111.To keep river course 111 not contaminated as far as possible, cofferdam 101 is removed operation and is abolished by surface concrete, builds island material
Excavate, cofferdam 101 is cleared up, the desilting of river course 111.
Cofferdam is cleared up：Surface concrete layer is carried out using track-like belt crushing head excavator to be abolished, the backfill dug out
Material builds slag and grit stone, is abolished, excavated and concentrated stacking daytime, and night unification is outer to abandon to spoil ground.
River dredging：After the filling material complete liquidation of cofferdam 101 is finished, desilting work is carried out to riverbed, desilting length contains
The upstream of former cofferdam 101, downstream respectively increase 10-20 meters, have reduced bed level.Mud is excavated using upper arm digging machine, is used
Totally enclosed type tank car is abandoned outside carrying out, and fixed location is abandoned outside mud, and does the safeguard procedures such as water proof, isolation, prevents secondary pollution.
In sum, the adjacent river foundation ditch that the present embodiment is provided builds the technological principle of island cofferdam clay water stop construction method and is：
According to the physical dimension size of cushion cap 104 and the position in river course 111, island cofferdam 101 is built in design, is set in the periphery of cofferdam 101
The steel-wire stone of anti-current scour is filled as the drainage wall that blocks water, cofferdam 101 using building slag charge.Secondly in cushion cap foundation ditch
103 peripheral scopes set one firm wall of steel-wire stone, it is ensured that the stabilization of cofferdam 101 during excavation of foundation pit S1003.Utilize
Clay horizontal permeation is 0Khm/d, and vertical infiltration is 0Kvm/d, the physical characteristic that block-water performance is high and plasticity is strong, in second
One clay seepproof screen 102 is filled in steel-wire stone outside, reduces the infiltration during excavation of foundation pit S1003.Excavation of foundation pit S1003
After the completion of, using punching block inner support mode, bearing platform construction is carried out as the dado template of cushion cap 104 while firm cushion cap foundation ditch 103
S1004。
The adjacent river foundation ditch that the present embodiment is provided builds island cofferdam clay water stop construction method and reduces difficulty of construction, simple easy
OK, construction speed is accelerated；Material is greatly saved, the duration is shortened, construction cost has been saved；Construction equipment less investment,
The supporting construction stability of cushion cap foundation ditch 103 is high, and construction operation is convenient.
The preferred embodiments of the present invention are the foregoing is only, is not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (6)
1. a kind of adjacent river foundation ditch builds island cofferdam clay water stop construction method, it is characterised in that including：
Build island cofferdam construction：Outside cushion cap foundation ditch predeterminated position, construction cofferdam；
The island cofferdam construction of building includes outside steel-wire stone wall construction；
The outside steel-wire stone wall construction：Using building stones to wire basket filling dress cage, wire basket is successively laid from outside to inside,
Form outside steel-wire stone wall；
The island cofferdam construction of building is filled including cofferdam；
Fill in the cofferdam：Slag is built in the inner side use of the outside steel-wire stone wall to fill, form cofferdam；
Inner side steel-wire stone wall construction：The inner side steel-wire stone wall construction it is described build island cofferdam construction after；It is described
Inner side steel-wire stone wall construction：Between cushion cap foundation ditch predeterminated position and cofferdam, using building stones to wire basket filling dress cage, steel
Silk cage is successively laid from the inside to the outside, forms inner side steel-wire stone wall；
Clay seepproof screen is constructed：Between cushion cap foundation ditch predeterminated position and the cofferdam and the inner side steel-wire stone wall outer side
Position construction clay seepproof screen；
Excavation of foundation pit：Excavated in cushion cap foundation ditch predeterminated position, obtain cushion cap foundation ditch；
Internal model supporting box is lifted：Using being lifted to cushion cap foundation ditch as the internal model supporting box of cushion cap template for pre-production
Predeterminated position, and to the internal model supporting box position and reinforce；
Cushion cap retaining wall is poured：After the completion of internal model supporting box lifting, in the internal model supporting box and cushion cap foundation ditch
Casting concrete between inwall, obtains cushion cap retaining wall；
Bearing platform construction：Poured in cushion cap foundation ditch and obtain cushion cap；
Internal model supporting box is removed, cofferdam demolition and river course are cleared up.
2. adjacent river foundation ditch according to claim 1 builds island cofferdam clay water stop construction method, it is characterised in that the clay
Seepproof screen is constructed：Clay is packed, and by clay bag be transported between cushion cap foundation ditch predeterminated position and cofferdam formed fill ditch
In groove, clay bag layering is piled up, the argillic horizon not packed, clay bag layer and argillic horizon are laid between adjacent two layers clay bag layer
Form clay seepproof screen.
3. adjacent river foundation ditch according to claim 1 builds island cofferdam clay water stop construction method, it is characterised in that the internal model
Supporting box includes multiple side plates, and multiple side plates join end to end and surround the casing that upper and lower ends are open, two institutes of arbitrary neighborhood
State and be provided with triangular support bracket between side plate, horizontal shore is provided between two relative side plates.
4. adjacent river foundation ditch according to claim 1 builds island cofferdam clay water stop construction method, it is characterised in that the foundation ditch
Excavation includes that foundation ditch is cut the earth and withdrawal；
The foundation ditch is cut the earth：Cut the earth in cushion cap foundation ditch predeterminated position, obtain the cushion cap foundation ditch of pre-set dimension；
The withdrawal：During foundation ditch shoveling, the water in cushion cap foundation ditch is pumped.
5. adjacent river foundation ditch according to claim 4 builds island cofferdam clay water stop construction method, it is characterised in that the foundation ditch
Excavating also includes foundation ditch desilting；
The foundation ditch desilting：After the completion of foundation ditch shoveling, by the silt displacement in cushion cap foundation ditch, sludge is discharged.
6. adjacent river foundation ditch according to claim 5 builds island cofferdam clay water stop construction method, it is characterised in that the foundation ditch
Excavating also includes back cover cushion construction；
The back cover cushion construction：After the completion of the foundation ditch desilting, back cover bed course is poured in cushion cap bottom of foundation ditch.
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| CN109915178B (en) * | 2019-03-29 | 2020-06-12 | 中国水利水电第三工程局有限公司 | Steel structure assisted jacking flow-reducing tunnel water plugging method |
| CN111364487A (en) * | 2020-03-19 | 2020-07-03 | 中铁隧道局集团有限公司 | Low-water-level combined cofferdam and construction method |
| CN115977124B (en) * | 2023-02-01 | 2023-09-01 | 甘肃省水利水电勘测设计研究院有限责任公司 | Automatic dismantlement formula is strutting arrangement under water based on hydrodynamic force |
| CN117888501B (en) * | 2024-03-15 | 2024-06-04 | 水利部交通运输部国家能源局南京水利科学研究院 | Method and system for in-situ stacking of formic nest islands after drying of lake sludge |
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| KR100989916B1 (en) * | 2010-02-23 | 2010-10-26 | 주식회사 한국종합기술 | Coffer dam structures for stream work and construction method |
| CN201778330U (en) * | 2010-08-03 | 2011-03-30 | 中建一局集团第三建筑有限公司 | Clay water-stop curtain wall |
| CN104762993A (en) * | 2015-02-11 | 2015-07-08 | 中国铁建大桥工程局集团有限公司 | Splicing type construction method of urban lake-passing tunnel |
| CN104805857B (en) * | 2015-05-06 | 2016-09-28 | 中铁十六局集团第三工程有限公司 | One detachably recycles bottomless steel jacket box and construction method thereof |
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