CN101158161A - Underwater no-bottom closing concrete boxed cofferdam and method of use thereof - Google Patents
Underwater no-bottom closing concrete boxed cofferdam and method of use thereof Download PDFInfo
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- CN101158161A CN101158161A CNA2007101133585A CN200710113358A CN101158161A CN 101158161 A CN101158161 A CN 101158161A CN A2007101133585 A CNA2007101133585 A CN A2007101133585A CN 200710113358 A CN200710113358 A CN 200710113358A CN 101158161 A CN101158161 A CN 101158161A
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Abstract
An underwater concrete boxed cofferdam without bottom sealing and an application method solves the shortcomings that the traditional steel cofferdam construction requires to pour thick concrete to seal the bottom; the consumption of steel material is large; the construction period is long; and the bearing platform quality is not easy to be controlled. The underwater concrete boxed cofferdam without bottom sealing is poured together with the concrete bearing platform; an upper part of the concrete boxed cofferdam is provided with a contemporary surf board cofferdam; and the surf board is dissembled after the concrete bearing platform is poured and completed. The concrete boxed cofferdam can be produced by factory prefabrication; the construction quality is easy to be controlled; the installation is convenient, simple and quick, which can accelerate the construction progress; the construction period is shortened reasonably and economically with reliability and safety; at the same time, the boxed cofferdam can play a seawater erosion prevention effect, which improves the durability of the engineering. The invention is mainly suitable for working in shallow water.
Description
Technical field:
The present invention relates to employed a kind of critical component and the application process of this parts in implementing the construction of highrise pile cap construction under water when highrise pile cap is built under water.
Background technology:
Domestic and international at present highrise pile cap under water all adopts traditional steel box method, its steel suspended box cofferdam is the interim stop water that designs for highrise pile cap construction in the water, its effect is to block water by the side plate of steel suspended box cofferdam and base plate, for bearing platform construction provides anhydrous dried place construction environment.Steel box construction needs at first in processing factory steel cofferdam machine-shaping, with large ship or transportation by driving to the job site, install with large-scale floating crane, hydraulic test sink in place after, the suspension rod anchoring is set, through artificial at least 1～2 meters thick bottom concretes under water of leak stopping after-pouring under water, after treating that concrete strength reaches requirement, extract the water in the casing out, carry out the bottom concrete leveling after, just can carry out bearing platform construction.After cushion cap is finished, remove the steel box.This method construction period is long, and the operation at sea amount is big, and material usage is big, and the bearing platform construction quality is wayward.If back cover is unsuccessful, then may cause raising of absolute altitude at the bottom of the cushion cap during secondary back cover, bring great risk to construction.
Summary of the invention:
The object of the present invention is to provide a kind of underwater no-bottom closing concrete boxed cofferdam, this casing adopts batch production prefabricated, quality is controlled easily, easy for installation, quick, the energy accelerating construction progress, simultaneously concrete boxed cofferdam itself can be used as permanent structure and prevents that cushion cap from avoiding sea water intrusion, has improved the durability of agent structure greatly.The present invention also provides the application process of underwater no-bottom closing concrete boxed cofferdam in implementing the construction of highrise pile cap construction under water.
The technical scheme that technical solution problem of the present invention is taked is: underwater no-bottom closing concrete boxed cofferdam, it is characterized in that, and the open topped of column casing, the bottom is provided with at the bottom of the case, the sealing of cylinder case wall; Be provided with the gap between the interior metope of casing and the external surface of cushion cap, box height is with the dimension of platform unanimity; Case bottom preformed hole quantity is identical with the bored pile quantity of same pier position, and the diameter of preformed hole is bigger than the diameter of drilled pile steel casing, and the center of preformed hole is corresponding with the center relative position of bored pile; The pre-buried pre-embedded bolt that is used to connect washboard in case wall top, preformed hole border, case bottom is provided with sealing air bag preformed groove; Pre-buried anchor plate at the bottom of the case.
The underwater no-bottom closing concrete boxed cofferdam application process is characterized in that, underwater no-bottom closing concrete boxed cofferdam and concrete bearing platform is built be integral, and the concrete jacket upper box part is installed interim washboard cofferdam, removes washboard after cushion cap concreting is finished.
Concrete job practices the steps include:
1) concrete boxed cofferdam is prefabricated: concrete boxed cofferdam is integral prefabricated at precasting yard, and integral hoisting goes out fortune;
2) concrete boxed cofferdam handling and installing and fixing: casing is prefabricated finish after, adopt crane ship to load onto ship out to transport to and specify the pier position, the field by using crane ship is installed, concrete boxed cofferdam is transferred to the design elevation position; Utilize suspension bracket to be suspended on the steel casing temporarily, and utilize the back-pressure bracket temporary fixed;
3) the sealing air bag that is installed between casing bottom preformed groove and the bored pile steel casing is inflated sealing; Drain the water in the casing behind the sealing, and adjust casing level and upper-lower position, pre-embedded steel slab on the concrete boxed cofferdam inner bottom plating and drilled pile steel casing are welded fixing, remove crane ship suspension hook and back-pressure bracket, thereby finish system conversion with connecting steel plate; End face after concrete boxed cofferdam is installed is concordant with the cushion cap concrete;
4) washboard is installed: washboard adopts whole splicing, when low tide, connects into integral body by washboard flange in the bottom dish and casing wall top pre-embedded bolt, establishes foam watertight rubber bar between washboard and the concrete boxed cofferdam;
5) bearing platform construction: after the system conversion, form dry application worker condition in the concrete boxed cofferdam, according to drawing colligation cushion cap reinforcing bar, reinforcing bar binding is finished and after the assay was approved, is carried out the cushion cap concrete pouring; Concrete build finish and reach requirement after remove washboard, bearing platform construction is finished.
In job practices of the present invention, after the casing installation, the high-strength elastic foam that 2cm is thick is bonded on the inboard concrete wall of casing with seccotine, seccotine was bonded between cushion cap and the casing in the slit after cushion cap was finished, can prevent that the cushion cap concrete from causing the casing crack because of expanding with heat and contract with cold, can prevent that also moisture content from entering, and plays the elastic telescopic effect.
In job practices of the present invention, cushion cap build finish remove washboard before, the end face slit is dark to 2cm between labor cleaning's cushion cap and the casing, and with the thick watertight rubber bar pay the seam of 2cm.This rubber strip water-swellable can avoid seawater to be seeped in the slit between casing and cushion cap, guarantees that cushion cap avoids the erosion of seawater.
Underwater no-bottom closing concrete boxed cofferdam of the present invention and application process thereof, cancelled the large-sized concrete back cover, concrete boxed cofferdam adopts batch production prefabricated, quality is controlled easily, and is easy for installation, quick, the energy accelerating construction progress, shorten construction period, reduce the operation at sea amount, concrete boxed cofferdam itself can be used as permanent structure and prevents that cushion cap from avoiding sea water intrusion simultaneously, has improved the durability of agent structure greatly.Have the characteristics quick, economic, safe, efficient, that engineering is more durable.
Description of drawings
Fig. 1 is concrete boxed cofferdam and constructing structure figure thereof;
Fig. 2 is a back-pressure bracket schematic diagram;
Fig. 3 is concrete boxed cofferdam construction total technological process figure.
Among the figure: 1 concrete boxed cofferdam, 2 steel casings, 3 back-pressure brackets, 4 anchor ears, 5 bolts, 6 mortars, 7 sealing capsules, 8 dowels, 9 anchor plates, 10 connect steel plate, 11 pre-embedded bolts, 12 watertight rubber bars, 13 washboards, 14 shaped steel ribbed stiffeners.
The specific embodiment
The primary structure design
As Fig. 1, this programme technical pattern is divided into permanent structure and temporary structure two parts.Wherein permanent structure partly comprises: concrete boxed cofferdam 1, anchor plate 9, sealing capsule 7 etc.; Temporary structure partly comprises: washboard 3, back-pressure bracket 3, suspension bracket, watertight rubber bar 12.
Concrete boxed cofferdam 1 (steel bar concrete casing) structure design, installation instructions:
The open topped of column casing, bottom are provided with at the bottom of the case, the sealing of cylinder case wall; Be provided with the gap between the interior metope of casing and the external surface of cushion cap, box height is with the dimension of platform unanimity; Case bottom preformed hole quantity is identical with the bored pile quantity of same pier position; The pre-buried pre-embedded bolt 11 that is used to connect washboard in case wall top, preformed hole border, case bottom is provided with sealing air bag preformed groove; Pre-buried anchor plate 9 at the bottom of the case, be positioned at case with the dowel 8 of anchor plate 9 one at the bottom of.
Strength grade of concrete: concrete adopts the marine durable concrete, and protective layer thickness is got 50mm.Concrete configuration should be selected high grade cement and the good high-quality aggregate of grating for use, and cement and aggregate should meet Ministry of Communications's standard " concrete for marine works structural anticorrosion erosion tecnical regulations " regulation and code requirement (JTJ275-2000).
The casing prefabricate and install technology requires:
(1) casing preformed hole plan-position should be determined according to field measurement stake position, so that reduce alignment error.
(2) casing lifting rigging adopts existing typing steel strand rigging.
(3) the casing sealing adopts inflation sealing capsule.
(4) casing is installed and must be taken advantage of the ebb tide construction operation, according to the reasonable scheduling job of the effect time.
When (5) casing is connected with the steel casing, should guarantee weldquality.
(6) the top washboard adopts the round platform nut to be connected with concrete boxed cofferdam, should guarantee when prefabricated that the position is accurate.
When (7) washboard being installed, inner support should be installed.
Coagulate the cross dimensions of soil suite case and determine according to dimension of platform, general casing length and width size is than the big 2cm of the every side of cushion cap, highly with the dimension of platform unanimity.Concrete casing side thickness 30cm, the thick 40cm of base plate, this size can be calculated the back according to cross dimensions, the water pressure of casing, the lateral pressure of building the concrete generation and impact force etc. and suitably adjust.
The concrete boxed cofferdam bottom is according to the actual quantity and the position reserving hole of bored pile, preformed hole quantity is identical with the bored pile quantity of same pier position, the diameter of preformed hole is bigger than the diameter of drilled pile casing, and the center of preformed hole is identical with the center relative position of bored pile.
Suspension bracket: suspension bracket is the interim instrument of lifting concrete boxed cofferdam, is made up of steel frame and hoist cable.Steel frame is with the shaped steel polygonal frame that is welded, uniform eight following hoist cables under the framework, and eight following hoist cables are used to hang concrete boxed cofferdam, uniform four hangers on the framework, the last hoist cable that is connected with hanger links to each other with crane ship.
Back-pressure bracket 3: the effect of back-pressure bracket is to prevent the concrete boxed cofferdam come-up.As Fig. 1, Fig. 2, a casing is established eight groups of back-pressure brackets, and the upper end is fixed on the steel casing 2 by anchor ear 4 (each up and down), and the lower end is supported on the cover box plate, prevents that casing is with moving on the water buoyancy because of after drawing water in the casing.The back-pressure bracket structure is by three i iron Π type that is welded, and the i iron in upper end is welded on the anchor ear, i iron lower end, both sides diagonal brace on the cover box plate, diagonal brace horizontal angle 60 degree.
Anchor ear 4: the effect of anchor ear is fixing back-pressure bracket, provides downward support force to prevent the casing come-up.The anchor ear structure is two half round bar steel plated constructions, radius is identical with the steel casing, orchid is managed in every semicircle steel plate termination, thereby the fastening anchor ear that makes in the termination of two semi-circular steel plates is fixed on the steel casing with high-strength bolt 5, plug rubber skin is to increase frictional resistance in the anchor ear, and every cover anchor ear is established fixedly high-strength bolt of 6 covers altogether.
Each steel casing is all established sealing capsule, back-pressure bracket and anchor ear.
Washboard 13: the effect of washboard is to prevent that moisture from entering in the casing, be installed on the top of concrete boxed cofferdam 1, pre-embedded bolt 11 and rubber washer and the casing of the footing piece of washboard by concrete boxed cofferdam wall top connects into integral body, foam watertight rubber bar 12 is set between washboard and concrete boxed cofferdam end face, to stop moisture to infiltrate, forming inner watertight cavity, for pier cap reinforcing bar binding and concrete cast provide the dry application worker condition.Washboard 13 is the tubular steel work, and peripheral panel adopts steel plate, adopts shaped steel ribbed stiffener 14 to guarantee that its rigidity is indeformable, shaped steel is set in inside supports, with opposing external water pressure power.See Fig. 1 for details.
Job practices:
Underwater no-bottom closing concrete boxed cofferdam technology of the present invention, cushion cap cofferdam take concrete that end cover box structure is arranged, and build with concrete bearing platform to be integral, and the concrete jacket upper box part is installed interim washboard cofferdam, removes after cushion cap concreting is finished.
Concrete boxed cofferdam construction total technological process is seen Fig. 3.
Concrete boxed cofferdam is manufactured: concrete boxed cofferdam is integral prefabricated at precasting yard, and integral hoisting goes out fortune.Precast concrete casing template adopts the typing punching block, and existing specialized factory can make.
Concrete boxed cofferdam handling and installing and fixing: casing is prefabricated finish after, adopt crane ship to load onto ship out and transport to appointment pier position, on-the-spot place, pier position of by suspension bracket the concrete boxed cofferdam lifting being transferred appointment with crane ship, suspension bracket is placed on the steel casing of adjusting absolute altitude in advance, steel casing absolute altitude is adjusted to the right place according to design cushion cap absolute altitude and sling length calculated in advance, the temporary fixed facilities of facility such as back-pressure bracket are installed when low tide, are removed suspension bracket and back-pressure bracket in system conversion back.
In preformed hole border, the bottom of concrete boxed cofferdam sealing air bag preformed groove is set, after concrete casing hoisted in position is adjusted, the sealing air bag of installing between casing bottom preformed groove and castinplace pile steel casing in advance 7 is inflated, ponding in time of low water is drained casing, and adjust the casing horizontal level, with connecting steel plate 10 pre-buried anchor plate on the concrete jacket box plate 9 and steel casing 2 are welded, carry out permanent fixation after, remove suspension bracket and back-pressure bracket, thereby finish the system conversion.Mortar 6 is filled in sealing capsule 7 tops.
After the casing installation, the high-strength elastic foam that 2cm is thick is bonded on the inboard concrete wall of casing with seccotine, can prevent that the cushion cap concrete from causing the casing crack because of expanding with heat and contract with cold, play the elastic telescopic effect.
After the system conversion, the concrete boxed cofferdam end face is concordant with the cushion cap concrete, and the effect of washboard mainly is to create conditions for cushion cap dry application worker.
Transporting and depositing in the process, the reply steel work adopts corresponding measure to prevent distortion, and the member that deforms is needed orthopedic can the use before installation.
Bearing platform construction: after forming dry application worker condition in the washboard installation, concrete boxed cofferdam, cut stake, the cutter pile crown; According to drawing colligation cushion cap reinforcing bar, the cushion cap reinforcing bar machines and after the assay was approved, the mix ship is in place, cast cushion cap concrete, concrete curing.
After cushion cap is built and is finished and remove washboard, the end face slit is dark to 2cm between labor cleaning's cushion cap and the casing, and clogs this rubber strip water-swellable with the thick watertight rubber bar of 2cm, can avoid seawater to be seeped in the slit between casing and cushion cap, guarantee that cushion cap avoids the erosion of seawater.After the watertight rubber bar was installed, crane ship was in place, removed washboard.Removing the back washboard reuses when constructing next time.
The present invention mainly is suitable for the shallow sea operation.
Facts have proved that present technique not only guarantees the cushion cap quality easily, improves structure durability, and easy construction, fast, efficiently have good economic benefits, saved investment, have bigger application value for the bridge construction.
Claims (5)
1. underwater no-bottom closing concrete boxed cofferdam is characterized in that, the open topped of column casing, and the bottom is provided with at the bottom of the case, the sealing of cylinder case wall; Be provided with the gap between the interior metope of casing and the external surface of cushion cap, box height is with the dimension of platform unanimity; Case bottom preformed hole quantity is identical with the bored pile quantity of same pier position, and the diameter of preformed hole is bigger than the diameter of drilled pile steel casing, and the center of preformed hole is corresponding with the center relative position of bored pile; The pre-buried pre-embedded bolt that is used to connect washboard in case wall top, preformed hole border, case bottom is provided with sealing air bag preformed groove; Pre-buried anchor plate at the bottom of the case.
2. the underwater no-bottom closing concrete boxed cofferdam application process is characterized in that, underwater no-bottom closing concrete boxed cofferdam and concrete bearing platform is built be integral, and the concrete jacket upper box part is installed interim washboard cofferdam, removes washboard after cushion cap concreting is finished.
3. underwater no-bottom closing concrete boxed cofferdam application process according to claim 2 is characterized in that step is:
1) concrete boxed cofferdam is prefabricated: concrete boxed cofferdam is integral prefabricated at precasting yard, and integral hoisting goes out fortune;
2) concrete boxed cofferdam handling and installing and fixing: casing is prefabricated finish after, adopt crane ship to load onto ship out to transport to and specify the pier position, the field by using crane ship is installed, concrete boxed cofferdam is transferred to the design elevation position; Utilize suspension bracket to be suspended on the steel casing temporarily, and utilize the back-pressure bracket temporary fixed;
3) the sealing air bag that is installed between casing bottom preformed groove and the bored pile steel casing is inflated sealing; Drain the water in the casing behind the sealing, and adjust casing level and upper-lower position, pre-embedded steel slab on the concrete boxed cofferdam inner bottom plating and drilled pile steel casing are welded fixing, remove crane ship suspension hook and back-pressure bracket, thereby finish system conversion with connecting steel plate; End face after concrete boxed cofferdam is installed is concordant with the cushion cap concrete;
4) washboard is installed: washboard adopts whole splicing, when low tide, connects into integral body by washboard flange in the bottom dish and casing wall top pre-embedded bolt, establishes foam watertight rubber bar between washboard and the concrete boxed cofferdam;
5) bearing platform construction: after the system conversion, form dry application worker condition in the concrete boxed cofferdam, according to drawing colligation cushion cap reinforcing bar, reinforcing bar binding is finished and after the assay was approved, is carried out the cushion cap concrete pouring; Concrete build finish and reach requirement after remove washboard, bearing platform construction is finished.
4. underwater no-bottom closing concrete boxed cofferdam application process according to claim 3, it is characterized in that, after the casing installation, the high-strength elastic foam that 2cm is thick is bonded on the inboard concrete wall of casing with seccotine, and seccotine was bonded between cushion cap and the casing in the slit after cushion cap was finished.
5. according to claim 3 or 4 described underwater no-bottom closing concrete boxed cofferdam application processes, it is characterized in that, cushion cap build finish remove washboard before, the end face slit is dark to 2cm between labor cleaning's cushion cap and the casing, and with the thick watertight rubber bar pay the seam of 2cm.
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Application publication date: 20080409 Assignee: Shandong Railway Road & Bridge Group Co., Ltd. Assignor: CRBC International Co., Ltd. Contract record no.: 2014370000057 Denomination of invention: Underwater no-bottom closing concrete boxed cofferdam and method of use thereof Granted publication date: 20100224 License type: Common License Record date: 20140415 Application publication date: 20080409 Assignee: Zhongjiao Second Highway Engineering Bureau Co., Ltd. Assignor: CRBC International Co., Ltd. Contract record no.: 2014370000058 Denomination of invention: Underwater no-bottom closing concrete boxed cofferdam and method of use thereof Granted publication date: 20100224 License type: Common License Record date: 20140415 Application publication date: 20080409 Assignee: Road & Bridge South China Engineering Co., Ltd. Assignor: CRBC International Co., Ltd. Contract record no.: 2014370000056 Denomination of invention: Underwater no-bottom closing concrete boxed cofferdam and method of use thereof Granted publication date: 20100224 License type: Common License Record date: 20140415 |
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