CN102505702A - Double-wall concrete open caisson and construction method thereof - Google Patents
Double-wall concrete open caisson and construction method thereof Download PDFInfo
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- CN102505702A CN102505702A CN2011103100756A CN201110310075A CN102505702A CN 102505702 A CN102505702 A CN 102505702A CN 2011103100756 A CN2011103100756 A CN 2011103100756A CN 201110310075 A CN201110310075 A CN 201110310075A CN 102505702 A CN102505702 A CN 102505702A
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Abstract
The invention relates to a double-wall concrete open caisson and a construction method thereof which are used for improving the bearing strength of the open caisson and lowering the construction cost. The double-wall concrete open caisson comprises a concrete outer well wall, an inner well wall, an inner partition wall, a heat-insulation layer and a bottom sealing plate, wherein the inner well wall and the outer well wall are connected by the inner partition wall, and the heat-insulation layer is filled in cavities formed by the inner well wall, the outer well wall and the inner partition wall and is made of anti-freezing sand or furnace slag. The construction method disclosed by the invention comprises the following steps of: pouring the open caisson, constructing the open caisson, sealing the bottom, back-filling the heat-insulation layer and the like. According to the double-wall concrete open caisson disclosed by the invention, structure stress can be optimized, the lateral pressure bearing capability is strong, and a double-wall sandwich back-filled by anti-freezing sand and furnace slag can take the place of conventional masonry gas concrete building blocks to insulate heat; in addition, the inner wall and outer wall of the double-wall concrete open caisson are cast in one step, thus the construction difficulty is reduced, the safety coefficient of construction operation is improved, the construction period can be largely shortened, and the construction cost is reduced.
Description
Technical field
The present invention relates to a kind of underground structure and job practices, particularly double-walled concrete open caisson and continuous job practices belong to construction engineering technical field.
Background technology
Open caisson construction generally is applied to build more, structure in the work-yard narrow be not suitable for a cubic metre of earth heavy excavation, the higher easy generation quicksand of groundwater table or subside, the deep foundation ditch under the condition such as soil mechanics unstable properties handles and constructs.At present, open caisson construction is the structure that after open caisson finishes, begins the construction drawing design in open caisson inside again, and there is long, shortcoming such as construction cost is high, single wall opposing cubic metre of earth lateral pressure is low of construction period in this job practices.Fast development along with novel chemical industry and super large output chemical project; On-the-spot underground structure more and more irregularization and maximization; Caisson structure is also increasing; Simple dependence increases wall thickness and solves an open caisson wall opposing cubic metre of earth lateral pressure and can not satisfy construction requirement, how to optimize caisson structure stressed, strengthen open caisson and receive force intensity, reduce construction cost and difficulty of construction becomes open caisson technology problem demanding prompt solution.
Summary of the invention
The present invention be used to overcome the defective of prior art and provide a kind of bearing strength high, be convenient to implement, double-walled concrete open caisson and job practices that construction cost is low.
The alleged problem of the present invention solves through following technical scheme:
A kind of double-walled concrete open caisson; Its special feature is: comprise the outer borehole wall of concrete, the interior borehole wall, internal partition wall and insulation layer and back cover plate in the formation; Connect by internal partition wall between the inside and outside borehole wall; Said insulation layer is filled in the cavity that is made up of the inside and outside borehole wall and internal partition wall, and insulation layer is antifreeze sand or slag.
Above-mentioned double-walled concrete open caisson, the cross section of the said inside and outside borehole wall constitutes " returning " shape, and back cover plate is positioned at the open caisson bottom; Borehole wall bottom is provided with the sword pin outside; Sword pin top is provided with groove, and the plate body periphery of back cover plate is provided with the oblique cutting angle, and top, oblique cutting angle is provided with convex tendon; The angle coupling of said oblique cutting angle and sword pin, said convex tendon and groove are chimeric.
Above-mentioned double-walled concrete open caisson, the interior borehole wall and outer borehole wall spacing 0.8m-1.2m, the outer borehole wall is thick to be 0.7-0.9m, the thick 0.5-0.7m of the interior borehole wall, internal partition wall thickness are 0.5m-0.8m, spacing 0.8m-1.2m; Said sword pin angle is 40-65 °.
Above-mentioned double-walled concrete open caisson job practices, it carries out according to following step:
A. pour into a mould open caisson: fluid concrete double-walled open caisson, can sink after concrete strength reaches 100%;
B. open caisson construction: before cutting the earth that all foreign material removings in the wellhole are clean, the mode that the shoveling of sword underfooting side is excavated according to symmetric position subregion, symmetry district is simultaneously carried out, and is divided into six districts according to the open caisson profile during construction; Each two district of wherein long end hole wall; Each district of the minor face borehole wall, earlier from two districts of the mutual correspondence of the minor face borehole wall simultaneously symmetries draw and dig sword underfooting necromancer, stop excavation when digging to the sword underfooting 100～200mm; Four district's while symmetries of the mutual correspondence of long then end hole wall are drawn and are dug sword underfooting necromancer; Stop excavation when digging to the sword underfooting 100～200mm, dig two corresponding each other districts of the minor face borehole wall again according to aforesaid way then, dig four corresponding each other districts of long end hole wall then again; So repeatedly with digging with falling; Stop to sink 24 hours when the double-walled open caisson is reduced to apart from design elevation 150mm place steadily, smoothly continuously, observe open caisson self sinking situation, adjust in place then;
C. back cover: the double-walled open caisson is sink to design elevation and carries out the back cover plate construction after stable, and 500mm thick rubble in shop is clamp-oned in the mud in the shaft bottom earlier, builds the thick plain concrete of 300mm then;
D. backfill insulation layer: antifreeze sand of backfill or slag in the cavity that the inside and outside borehole wall and internal partition wall constitute constitute insulation layer.
Above-mentioned double-walled concrete open caisson job practices must be with heavy with survey in the open caisson construction step, and in time three kinds of method for correcting error are adopted in correction, and the one, vertical missing 50mm according to well azimuth, adjusts the offside digging depth when having a down dip; The 2nd, when tilting when vertical missing 50mm is above, the eccentric pressurization at the top; The 3rd, proofread and correct when having any problem, local jetting reduces frictional resistance outside well.
Main feature of the present invention is following: 1 double-walled concrete open caisson bears the side pressure ability in the sinking process and when using strong; Internal partition wall is connected in the bulk strength that had both increased the borehole wall between the inside and outside borehole wall; Increase the rigidity of open caisson in the sinking process again; Structure and security maintenance are united two into one, increased safety factor; Double-walled construction optimize structure stressed in, antifreeze sand of backfill or slag can replace routine to build by laying bricks or stones and add the aerated concrete block insulation in the interlayer of double-walled; 3. the completion because double-walled concrete open caisson inwall, outer wall are once cast; Make and partly descend the construction operation task to accomplish construction in advance on ground, reduced difficulty of construction and improved the construction operation safety factor, can shorten the construction period greatly and reduce construction cost; Through measuring and calculating; Adopt the inventive method to build the double-walled concrete open caisson and compare with traditional heavy excavation and stake supporting method, expense is merely 1/3rd of conventional method, and the engineering time is about 1/2nd of conventional method; 4. job practices of the present invention has solved that the work-yard is narrow can't carry out problems such as soil excavation is prone to subside in a cubic metre of earth heavy excavation, muck foundation, phreatic high ground and the drift sand ground, has also solved open caisson simultaneously and has gone along with sb. to guard him the construction difficult problem of constructing simultaneously and sinking simultaneously with drawing design utility structure.
Description of drawings
Fig. 1 is a double-walled concrete open caisson plan view of the present invention;
Fig. 2 is the longitudinal section sketch map (not in scale) of double-walled concrete open caisson of the present invention;
Fig. 3 is the enlarged drawing of borehole wall part outside the A portion among Fig. 2;
Fig. 4 is the enlarged drawing of A portion back cover plate part among Fig. 2.
Each label is in the accompanying drawing: 1, insulation layer, 2, the interior borehole wall, 3, the outer borehole wall, 4, internal partition wall, 5, back cover plate, 6, the sword pin, 7, groove, 8, the oblique cutting angle, 9, convex tendon.
The specific embodiment
Referring to Fig. 1, Fig. 2, its formation of double-walled concrete open caisson of the present invention comprises the outer borehole wall 3 of concrete, the interior borehole wall 2, internal partition wall 4 and back cover plate 5 and insulation layer 1, and the outer borehole wall, the interior borehole wall, internal partition wall all are to cast in advance, and insulation layer is filled after open caisson is accomplished.The borehole wall was outside in the said outer borehole wall was enclosed within, and back cover plate 5 is positioned at the open caisson bottom, is connected by internal partition wall between the inside and outside borehole wall, has improved the intensity of the borehole wall greatly, particularly the ability of opposing cubic metre of earth lateral pressure.Insulation layer is filled in the cavity of the inside and outside borehole wall and internal partition wall formation, and insulation layer adopts antifreeze sand or slag.The cross section of the inside and outside borehole wall of double-walled concrete open caisson embodiment illustrated in fig. 1 constitutes " returning " shape, can also be as required in the borehole wall, the outer borehole wall adopt other geometry of mating each other.Distance between the inside and outside borehole wall is 0.8m-1.2m, and the outer borehole wall is thick to be 0.7-0.9m, and the thick 0.5-0.7m of the interior borehole wall, internal partition wall thickness are 0.5m-0.8m, spacing 0.8m-1.2m.The sword pin of the outer borehole wall is the blade-like on inclined-plane for the inboard, and this structure can significantly reduce penetration resistance, and sword pin medial surface oblique angle B is 40-65 °.
Referring to Fig. 2-4, for improving the bonding strength of the outer borehole wall and back cover plate, the top of borehole wall sword pin 6 is provided with groove 7 outside; The periphery of back cover plate 5 is provided with oblique cutting angle 8; Top, oblique cutting angle is provided with convex tendon 9, the angle coupling of said oblique cutting angle C and sword pin B, and said convex tendon and groove are chimeric.
Double-walled concrete open caisson of the present invention adopts continuous form of construction work, and job practices comprises the steps:
(1) pours into a mould the double-walled concrete open caisson in advance according to the drawing project organization, must after concrete strength reaches 100%, can sink, be as the criterion with test cube in the same condition intensity in the construction.
(2) should all foreign material in the wellhole be removed before cutting the earth clean, check that its preparation is all ready after, can begin to cut the earth.For open caisson is evenly sunk, sword underfooting side cut the earth answer subregion, successively, symmetry carries out synchronously.To back-shaped double-walled concrete open caisson as shown in Figure 1, with the double-walled concrete open caisson be divided into 1., 2., 3., 4., 5., 6. six districts, wherein two long end hole walls are symmetrical set four districts, two minor face boreholes wall are symmetrical set two districts.Sequence of construction is drawn and is dug sword underfooting necromancer for 3., 4. distinguishing two groups of personnel's symmetries; Stop excavation when digging to the sword underfooting 100～200mm; 1., 2., 5., 6. distinguishing simultaneously four groups of personnel begins symmetry and draws and dig sword underfooting necromancer; Then 3., 4. the district begins symmetry again and draws and dig, so repeatedly with digging with falling stop excavation when digging to the sword underfooting 100～200mm.Earth excavation adopts manual work and mechanical engagement to cut the earth within the interior borehole wall.Concrete shoveling method is: cubic metre of earth employing hand excavation between the outer borehole wall and the interior borehole wall, cubic metre of earth employing excavator is by excavation around the middle mind-set between the interior borehole wall and the interior borehole wall.The double-walled concrete open caisson is reduced to apart from design elevation 150mm place steadily, smoothly, and stop to sink 24 hours this moment, observes open caisson self sinking situation, adjusts in place then.
(3) the double-walled open caisson can produce certain deflection in the sinking process continuously, and therefore the surveying work in the sinking process is very important, must in time find deflection with survey with heavy, and correction is in time avoided occurring big deflection and caused the correction difficulty.Before the double-walled well sinking of the present invention co-ordination is set on the borehole wall, and hangs up plumb bob in borehole wall corner, mark the horizontal ruler line from top to bottom at borehole wall end face simultaneously, in the sinking process, observe plumb bob and vertical line deflection situation at any time, the discovery deflection is rectified a deviation at any time.By the professional per hour repetition measurement once and carry out record control the open caisson resistance to overturning with this.
Usually adopt three kinds of method for correcting error continuously in the double-walled well sinking process: the one, produce when (when vertical missing 50mm is following) tilts on a small quantity, according to well azimuth, adjustment offside digging depth; The 2nd, produce when big (when vertical missing 50mm is above) tilts eccentric pressurization at the top; The 3rd, proofread and correct when having any problem, local jetting reduces frictional resistance outside well.
(4) back cover: the double-walled open caisson is sink to and begins to carry out the back cover plate construction after design elevation is stablized continuously; 500mm thick rubble in shop is clamp-oned in the mud in the shaft bottom earlier; Build the thick plain concrete of 300mm then, during back cover two steel plate collecting wells will be set, do not stop precipitation with submersible pump in the shaft bottom.
(5) backfill insulation layer is filled out antifreeze sand or slag in the cavity of the inside and outside borehole wall and internal partition wall formation, replace routine to build air-entrained concrete building block by laying bricks or stones, plays insulation effect.
The scope of application of the inventive method is: open caisson is long: 5m-60m, and wide: 5m-60m, height: 5m-60m.To with the double-walled concrete open caisson that highly surpasses 10m, to pour into a mould and need carry out by merogenesis, every joint highly is 5m-6m, after the first segment open caisson construction is accomplished, continues the excavation sinking and connect to build next joint, the open caisson construction method is the same.
Claims (5)
1. double-walled concrete open caisson; It is characterized in that: it comprises the outer borehole wall (3) of concrete, the interior borehole wall (2), internal partition wall (4) and insulation layer (1) and back cover plate (5); Connect by internal partition wall between the inside and outside borehole wall; Said insulation layer is filled in the cavity that is made up of the inside and outside borehole wall and internal partition wall, and insulation layer is antifreeze sand or slag.
2. double-walled concrete open caisson according to claim 1 is characterized in that: the cross section of the said inside and outside borehole wall constitutes " returning " shape, and back cover plate is positioned at the open caisson bottom; Borehole wall bottom is provided with the sword pin outside; Sword pin top is provided with groove (7), and the plate body periphery of back cover plate is provided with oblique cutting angle (8), and top, oblique cutting angle is provided with convex tendon (9); The angle coupling of said oblique cutting angle and sword pin, said convex tendon and groove are chimeric.
3. double-walled concrete open caisson according to claim 2 is characterized in that: the interior borehole wall and outer borehole wall spacing 0.8m-1.2m, and the outer borehole wall is thick to be 0.7-0.9m, the thick 0.5-0.7m of the interior borehole wall, internal partition wall thickness are 0.5m-0.8m, spacing 0.8m-1.2m; Said sword pin angle is 40-65 °.
4. the job practices of a construction such as claim 1 or 2 or 3 described double-walled concrete open caissons, it is characterized in that: it carries out according to following step:
A. pour into a mould open caisson: fluid concrete double-walled open caisson, can sink after concrete strength reaches 100%;
B. open caisson construction: before cutting the earth that all foreign material removings in the wellhole are clean, the mode that the shoveling of sword underfooting side is excavated according to symmetric position subregion, symmetry district is simultaneously carried out, and is divided into six districts according to the open caisson profile during construction; Each two district of wherein long end hole wall; Each district of the minor face borehole wall, earlier from two districts of the mutual correspondence of the minor face borehole wall simultaneously symmetries draw and dig sword underfooting necromancer, stop excavation when digging to the sword underfooting 100～200mm; Four district's while symmetries of the mutual correspondence of long then end hole wall are drawn and are dug sword underfooting necromancer; Stop excavation when digging to the sword underfooting 100～200mm, dig two corresponding each other districts of the minor face borehole wall again according to aforesaid way then, dig four corresponding each other districts of long end hole wall then again; So repeatedly with digging with falling; Stop to sink 24 hours when the double-walled open caisson is reduced to apart from design elevation 150mm place steadily, smoothly continuously, observe open caisson self sinking situation, adjust in place then;
C. back cover: the double-walled open caisson is sink to design elevation and carries out the back cover plate construction after stable, and 500mm thick rubble in shop is clamp-oned in the mud in the shaft bottom earlier, builds the thick plain concrete of 300mm then;
D. backfill insulation layer: antifreeze sand of backfill or slag in the cavity that the inside and outside borehole wall and internal partition wall constitute constitute insulation layer.
5. double-walled concrete open caisson job practices according to claim 4 is characterized in that: must be in the open caisson construction step with heavy with survey, and correction in time; Adopt three kinds of method for correcting error; The one, vertical missing 50mm when having a down dip, according to well azimuth, adjustment offside digging depth; The 2nd, when tilting when vertical missing 50mm is above, the eccentric pressurization at the top; The 3rd, proofread and correct when having any problem, local jetting reduces frictional resistance outside well.
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| CN2011103100756A CN102505702A (en) | 2011-10-13 | 2011-10-13 | Double-wall concrete open caisson and construction method thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104005419A (en) * | 2014-06-23 | 2014-08-27 | 洛阳城市建设勘察设计院有限公司 | Box culvert structure and construction method through sedimentation construction |
| CN105951864A (en) * | 2016-05-26 | 2016-09-21 | 上海二十冶建设有限公司 | Prevention method for soft soil foundation settlement caused by open caisson manufacturing |
| CN106545026A (en) * | 2016-10-27 | 2017-03-29 | 中交第二航务工程局有限公司 | Open caisson subregion based on remaining core soil in advance excavates method for sinking |
| CN107675928A (en) * | 2017-07-26 | 2018-02-09 | 喻天宝 | Well formula underground parking garage |
| CN108049419A (en) * | 2018-01-24 | 2018-05-18 | 中交二航局第四工程有限公司 | A kind of assembled open caisson partition wall cutting shoe structure |
| CN109706952A (en) * | 2018-12-25 | 2019-05-03 | 中建四局第六建筑工程有限公司 | Large-scale well-sinking construction method |
| CN110093942A (en) * | 2019-05-30 | 2019-08-06 | 安徽省交通控股集团有限公司 | A kind of assembled radical well foundation of two-wall hollow |
| CN110887381A (en) * | 2019-12-05 | 2020-03-17 | 马鞍山钢铁股份有限公司 | Method for replacing lining plate of furnace wall of annealing furnace |
| CN113174988A (en) * | 2021-04-30 | 2021-07-27 | 中国化学工程第十三建设有限公司 | Double-wall concrete open caisson structure and construction method |
| EP3936295A1 (en) * | 2020-07-07 | 2022-01-12 | Manuel Rojas Fernández-Fígares | Floating caissons, methods and apparatus for constructing floating caissons |
| CN115387366A (en) * | 2022-08-31 | 2022-11-25 | 中铁十五局集团有限公司 | Bottom sealing construction method for open caisson or cofferdam |
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Cited By (15)
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| CN104005419B (en) * | 2014-06-23 | 2016-04-20 | 洛阳城市建设勘察设计院有限公司 | The box culvert structure of sinking method construction and construction method |
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| CN105951864A (en) * | 2016-05-26 | 2016-09-21 | 上海二十冶建设有限公司 | Prevention method for soft soil foundation settlement caused by open caisson manufacturing |
| CN106545026A (en) * | 2016-10-27 | 2017-03-29 | 中交第二航务工程局有限公司 | Open caisson subregion based on remaining core soil in advance excavates method for sinking |
| CN107675928A (en) * | 2017-07-26 | 2018-02-09 | 喻天宝 | Well formula underground parking garage |
| CN108049419B (en) * | 2018-01-24 | 2024-02-02 | 中交二航局第四工程有限公司 | Assembled open caisson partition wall edge structure |
| CN108049419A (en) * | 2018-01-24 | 2018-05-18 | 中交二航局第四工程有限公司 | A kind of assembled open caisson partition wall cutting shoe structure |
| CN109706952A (en) * | 2018-12-25 | 2019-05-03 | 中建四局第六建筑工程有限公司 | Large-scale well-sinking construction method |
| CN110093942A (en) * | 2019-05-30 | 2019-08-06 | 安徽省交通控股集团有限公司 | A kind of assembled radical well foundation of two-wall hollow |
| CN110887381A (en) * | 2019-12-05 | 2020-03-17 | 马鞍山钢铁股份有限公司 | Method for replacing lining plate of furnace wall of annealing furnace |
| EP3936295A1 (en) * | 2020-07-07 | 2022-01-12 | Manuel Rojas Fernández-Fígares | Floating caissons, methods and apparatus for constructing floating caissons |
| WO2022008555A1 (en) * | 2020-07-07 | 2022-01-13 | Rojas Fernandez Figares Manuel | Floating caissons, methods and apparatus for constructing floating caissons |
| CN113174988A (en) * | 2021-04-30 | 2021-07-27 | 中国化学工程第十三建设有限公司 | Double-wall concrete open caisson structure and construction method |
| CN115387366A (en) * | 2022-08-31 | 2022-11-25 | 中铁十五局集团有限公司 | Bottom sealing construction method for open caisson or cofferdam |
| CN115387366B (en) * | 2022-08-31 | 2023-06-02 | 中铁十五局集团有限公司 | Bottom sealing construction method for open caisson or cofferdam |
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Application publication date: 20120620 |