CN110939148A - Construction method of double-wall steel suspension box cofferdam serving as drilling platform - Google Patents
Construction method of double-wall steel suspension box cofferdam serving as drilling platform Download PDFInfo
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- CN110939148A CN110939148A CN201911237071.2A CN201911237071A CN110939148A CN 110939148 A CN110939148 A CN 110939148A CN 201911237071 A CN201911237071 A CN 201911237071A CN 110939148 A CN110939148 A CN 110939148A
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/18—Foundations formed by making use of caissons
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/52—Submerged foundations, i.e. submerged in open water
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Abstract
The invention mainly relates to a construction method of a double-wall steel suspension box cofferdam serving as a drilling platform. In the construction method, the steel suspension box is transported to a pier position in a floating mode, the position of the steel cofferdam is preliminarily located through the locating anchor pier, and the steel pile casing is inserted and located for accurate locating. And (3) after the steel cofferdam is filled with water and sinks to the designed elevation, fixing a hanging pile, laying a drilling supporting platform, constructing a drilling cast-in-place pile and sealing the bottom of the cofferdam. The construction of the steel suspension box cofferdam mainly plays a role in providing a drilling supporting platform and a bearing platform construction waterless operation space. The position of the cofferdam is fixed under the condition of tidal reciprocating flow by inserting and beating the positioning steel pile casings in time, so that the engineering quality and the construction operation safety are ensured. By synchronous construction of the 'weir' and the 'pile', the engineering cost is saved, and valuable experience is provided for the double-wall steel suspension box cofferdam and the deep water foundation construction of similar engineering in the future.
Description
Technical Field
The invention belongs to the technical field of deepwater foundation construction, and particularly relates to a construction method of a double-wall steel hanging box cofferdam serving as a drilling platform.
Background
With the continuous development of economic construction in China, more and more bridges span large rivers, and most of underwater bridge pile foundations and bearing platforms need to be constructed by means of steel cofferdams. At present, three cofferdam structural forms, namely a steel sheet pile cofferdam, a steel boxed cofferdam and a steel suspension box cofferdam are mainly used for building the deep water foundation of the bridge. In the deep water foundation construction, when the bridge underwater foundation is a high pile bearing platform, the steel suspension box cofferdam is widely used.
The steel suspension box steel cofferdam has two kinds of modes of assembling in assembling, carries out whole assembly floating transportation and carries out the segment at pier position department and assemble respectively at the formulation precast yard, carries out the segment at the pier position and assembles the time, and general work load is great, and the aquatic operation degree of difficulty is big. Meanwhile, when the drilling construction is carried out in the prior art, the Bailey beams are arranged on the steel suspension box cofferdam to build the drilling platform.
Disclosure of Invention
The invention provides a construction method of a double-wall steel suspension box cofferdam which is also used as a drilling platform, and particularly relates to a construction method of a double-wall steel suspension box cofferdam under the action of tidal reciprocating flow under severe hydrological conditions.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a construction method of a double-wall steel suspension box cofferdam serving as a drilling platform comprises the following steps:
s1, assembling the double-wall steel hanging box cofferdam, performing a kerosene penetration experiment to ensure that all inspection items of the cofferdam are qualified, and marking a water level line on an outer side wall plate;
s2, after the cofferdam is launched into water, carrying out primary positioning to the pier position by integral floating, and inserting and beating a positioning steel casing by using a floating crane after the primary positioning is finished;
s3, after the cofferdam is positioned, slowly sinking the cofferdam, enabling the draft to be stable from floating to the designed height, hanging the pile for fixing, and inserting and driving the non-directional steel pile casing to enable the steel cofferdam and the positioning steel pile casing to form a whole;
s4, drilling is carried out on the top of the double-wall steel suspension box cofferdam by a supporting platform; after the construction of the drilling supporting platform is completed, the construction of the cast-in-situ bored pile is carried out;
s5, after the cofferdam and the pile wall are cleaned, pouring bottom sealing concrete, and after the bottom sealing concrete reaches a certain strength, converting a suspension system of the cofferdam; and after the cofferdam is in a stable state, pumping water in the cofferdam, cutting off redundant steel pile casings, dismantling the hanging rods, chiseling pile heads, and performing subsequent process construction.
Further, in the step S1, the assembly sequence of the double-wall steel hanging box cofferdam is that a steel stool fetal membrane, a bottom plate, a bottom compartment, a side plate and an inner support are installed; and carrying out a kerosene penetration experiment after the installation is finished, ensuring that all inspection items of the cofferdam are qualified, and adopting red and white paint on the outer side wall plate as a water level line mark.
Further, in the step S1, the assembly of the double-wall steel suspension box cofferdam is performed by dividing the side plate into a plurality of unit blocks according to the structural features of the cofferdam, the unit blocks are assembled one by one in the assembly area after being processed and formed in the manufacturing area, and the inner and outer wall plates are staggered during the block division and are not blocked at the position of the bay plate.
Further, after the cofferdam is launched into water in the step S2, the cofferdam is transported to the position of a pier in an integral floating mode, preliminary positioning is carried out by adopting a positioning ship and anchor pier positioning method, meanwhile, measurement data are collected in real time at the top distribution point of the steel cofferdam, and an anchoring system is adjusted repeatedly until the tail position of the cofferdam is accurate to achieve the preliminary positioning; and after the preliminary positioning is finished, inserting and beating the positioning steel casing by using the floating crane, inserting and beating a first steel casing, finely adjusting the position of the cofferdam, and then sequentially inserting and beating the other positioning steel casings to ensure that the cofferdam is accurately positioned within an error range.
Further, after the cofferdam is launched in step S2, when the tug decelerates to drag the cofferdam to a certain position away from the pier, the steel wire rope of the anchor pier system is connected to initially position the cofferdam, and after the jack connected with the anchor pier accurately positions the cofferdam, the positioning steel casing is inserted.
Further, after the cofferdam is positioned in the step S3, the cofferdam is slowly sunk in a mode of evenly injecting water into the bulkhead and the side wall, the draft is stabilized to the designed height from floating, the pile is hung and fixed, the non-oriented steel pile casing is inserted and driven, the vertical support is formed by utilizing the upper guide ring and the bracket of the positioning pile, and the wedge block is used for wedging between the lower guide ring and the steel pile, so that the steel cofferdam and the positioning steel pile casing form a whole;
further, in the step S4, drilling is carried out on the top of the double-wall steel suspension box cofferdam by depending on the platform; arranging inclined struts on the steel cofferdam and the steel pile casings, laying longitudinal and transverse distribution beams and steel plates to form a supporting platform, performing cast-in-place bored pile construction after the construction of the drilling supporting platform is completed, and constructing according to the sequence of firstly constructing a non-positioning pile and then constructing a positioning pile in the drilling sequence; in the construction process, cofferdam pile hanging is carried out immediately after one pile is finished.
Furthermore, in the step S4, the supporting platform for drilling is built on the top of the double-wall steel suspension box cofferdam, and the supporting platform is basically composed of inclined supports on the steel cofferdam, supports on steel pile casings, longitudinal and transverse distribution beams and steel plates.
Further, in the step S5, after the cofferdam and the pile casing wall are cleaned, bottom sealing concrete pouring is performed, before bottom sealing in the cofferdam, concrete balance weights are poured in the double walls of the cofferdam, areas are poured in layers by symmetry on the cofferdam according to bottom compartments, the method of pulling balls out one by full-distribution pipes is adopted for bottom sealing concrete pouring, the cofferdam is sequentially divided into compartments and blocks at the middle and the two ends, the pouring is performed in different times, each area is poured according to the principle of diagonal angle and symmetry from a low point to a high point, after the bottom sealing concrete reaches a certain strength, the conversion of a hanging system of the cofferdam is performed, after the cofferdam is in a stable state, water is pumped in the cofferdam, redundant steel pile casings are cut off, suspenders are removed, pile heads are chiseled, and subsequent procedures such as large-volume concrete bearing platforms are.
Furthermore, in step S5, the pouring principle of the back cover concrete is to pour areas of the cofferdam symmetrically in layers according to the bottom compartments, the back cover concrete pouring is performed by a method of fully distributing the conduits to pull out the balls one by one, the pouring is performed in a cabin-by-cabin and block-by-block manner sequentially from the middle to the two ends, the pouring is completed in multiple times, each area is poured according to a principle of diagonal angle and symmetry from a low point to a high point, the system conversion of the cofferdam is completed, and the preparation for the construction of the bearing platform in the cofferdam is.
Compared with the prior art, the invention has the following beneficial effects:
1) the steel suspension box cofferdam is mainly transported to a pier position in an integral floating mode for accurate positioning, so that the construction period is saved, the difficulty of marine operation is reduced, and the construction quality is improved compared with a method for assembling sections in deep water;
2) according to the drilling supporting platform, corbels are directly welded on the steel cofferdam and the steel casing to support, the distribution beams are laid, and the triangular stiffening plates are used for positioning the distribution beams, so that the requirements of drilling machine construction are met.
Drawings
FIG. 1 is a principal flow diagram of an embodiment of the present invention;
FIG. 2 is a schematic view of a double-walled steel cofferdam anchor block positioning system according to an embodiment of the present invention;
FIG. 3 is a schematic view of a drilling support platform support distribution beam connection according to an embodiment of the invention;
FIG. 3(a) is a top view;
fig. 3(b) is a view in the front view direction.
Description of reference numerals:
1-double-wall steel suspension box cofferdam; 2-a cable; 3-positioning the ship; 4-an anchoring system; 5, anchoring the pier; 6-non-positioning steel casing; 7-positioning a steel casing; 8-transverse distribution beams; 9-longitudinal distribution beams; 10-supporting; 11-steel plate.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In order to make the objects and features of the present invention more comprehensible, embodiments accompanying the present invention are further described below. It is noted that the drawings are in greatly simplified form and employ non-precise ratios for the purpose of facilitating and distinctly aiding in the description of the patented embodiments of the invention.
Fig. 1 is a main flow chart of an embodiment of the invention, in the scheme of the invention, the assembly sequence of a double-wall steel suspension box cofferdam 1 is that a steel stool fetal membrane, a bottom plate, a bottom compartment, side plates and an inner support are installed, a kerosene penetration experiment is finally required, after the cofferdam is completely assembled, all items are qualified by inspection, and red and white paint is adopted on the outer side wall plate as a water level line mark.
Double-walled steel suspension box cofferdam 1 assemble, because the cofferdam curb plate is bulky, unable one-time machine-shaping, simultaneously in order to reduce welding deformation and accelerate the construction progress, divide the curb plate into a plurality of unit pieces according to cofferdam structure characteristics, the unit piece is assembled in the district of assembling after the machine-shaping in preparation district one by one, simultaneously for making steel cofferdam atress reasonable, it is concentrated to reduce welding stress, the interior outer wall board staggers during the piecing to not being in the piecing of bay board position.
As shown in figure 2, after the steel cofferdam 1 is launched into water, the steel cofferdam is transported to the position of a pier by integral floating, the preliminary positioning is carried out by adopting a positioning ship 3 and an anchor pier 5 positioning method, meanwhile, the measured data is collected at the top distribution point of the steel cofferdam in real time, and an anchoring system 4 is adjusted repeatedly until the position of the tail part of the cofferdam is accurate, so that the preliminary positioning is achieved. After the preliminary positioning is finished, inserting and beating a positioning steel casing by using a floating crane, inserting and beating a first steel casing, finely adjusting the position of the cofferdam, and then sequentially inserting and beating the other positioning steel casings to ensure that the cofferdam is accurately positioned within an error range;
after the cofferdam is launched, when the tug decelerates to drag the cofferdam to a certain position away from the pier, the cable 2 of the anchoring system 4 is connected to initially position the cofferdam, and after the jack connected with the anchor pier 5 is used for accurately positioning the cofferdam, the positioning steel pile casing 7 is inserted and beaten.
After the cofferdam is positioned, the cofferdam is slowly sunk in a mode of evenly injecting water into the bulkhead and the side wall, the draft is stabilized to the designed height from floating, the pile is hung and fixed, the non-directional steel pile casing 6 is inserted and driven, the vertical support is formed by utilizing the upper guide ring and the bracket of the positioning pile, and the lower guide ring and the steel pile are wedged and compacted by the wedge block to form a whole.
The construction of the drilling supporting platform is carried out at the top of the double-wall steel suspension box cofferdam. As shown in fig. 3, supports 10 are arranged on the steel cofferdam and the steel pile casing, transverse distribution beams 8, longitudinal distribution beams 9 and steel plates 11 are laid to form a supporting platform, bored pile construction is carried out after the construction of the drilling supporting platform is finished, and the drilling sequence is carried out according to the sequence of non-positioning piles 6 and positioning piles 7. In the construction process, cofferdam pile hanging is carried out immediately after one pile is finished.
The drilling supporting platform is built at the top of the double-wall steel suspension box cofferdam, the supporting platform is basically structurally characterized in that inclined supports 10 on the steel cofferdam and supports 10 on steel protective cylinders are arranged on the inclined supports 10, longitudinal distribution beams 9 and transverse distribution beams 8 are arranged on the supports 10 to provide bearing capacity for a drilling platform steel plate 11, and meanwhile, the distribution beams adopt triangular stiffening plates to limit displacement, so that the requirement of drilling machine construction is met.
And after the cofferdam and the pile wall are cleaned, pouring back cover concrete, pouring concrete in the double walls of the cofferdam for balancing weight before the back cover in the cofferdam, pouring areas of the cofferdam in a symmetrical and layered manner according to back bulkhead by the back cover of the cofferdam, adopting a method of pulling balls out one by fully distributing pipes, sequentially carrying out cabin division and block division on the middle and the two ends, pouring for multiple times, pouring each area according to the principle of diagonal angle and symmetry from a low point to a high point, and carrying out suspension system conversion on the cofferdam after the back cover concrete reaches a certain strength. After the cofferdam is in a stable state, pumping water in the cofferdam, cutting off redundant steel pile casings, dismantling the hanger rods and the pile heads, and performing subsequent process construction such as layered pouring of large-volume concrete bearing platforms;
according to the pouring principle of the back cover concrete, areas are symmetrically layered poured on the cofferdam according to the back bulkhead, the back cover concrete pouring adopts a method of fully distributing the guide pipes and pulling out the balls one by one, the pouring is finished in a split-cabin and split-block mode in sequence from the middle to the two ends, the pouring is finished in multiple times, each area is poured according to a diagonal and symmetrical principle from a low point to a high point, the system conversion of the cofferdam is finished, and the preparation for the construction of a bearing platform in the cofferdam is carried out.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A construction method of a double-wall steel suspension box cofferdam serving as a drilling platform is characterized by comprising the following steps:
s1, assembling the double-wall steel hanging box cofferdam, performing a kerosene penetration experiment to ensure that all inspection items of the cofferdam are qualified, and marking a water level line on an outer side wall plate;
s2, after the cofferdam is launched into water, carrying out primary positioning to the pier position by integral floating, and inserting and beating a positioning steel casing by using a floating crane after the primary positioning is finished;
s3, after the cofferdam is positioned, slowly sinking the cofferdam, enabling the draft to be stable from floating to the designed height, hanging the pile for fixing, and inserting and driving the non-directional steel pile casing to enable the steel cofferdam and the positioning steel pile casing to form a whole;
s4, drilling is carried out on the top of the double-wall steel suspension box cofferdam by a supporting platform; after the construction of the drilling supporting platform is completed, the construction of the cast-in-situ bored pile is carried out;
s5, after the cofferdam and the pile wall are cleaned, pouring bottom sealing concrete, and after the bottom sealing concrete reaches a certain strength, converting a suspension system of the cofferdam; and after the cofferdam is in a stable state, pumping water in the cofferdam, cutting off redundant steel pile casings, dismantling the hanging rods, chiseling pile heads, and performing subsequent process construction.
2. The construction method of the double-wall steel suspension box cofferdam doubling as a drilling platform as claimed in claim 1, wherein the assembling sequence of the double-wall steel suspension box cofferdam in step S1 is steel stool moulding bed, bottom plate, bottom compartment, side plate and inner support installation; and carrying out a kerosene penetration experiment after the installation is finished, ensuring that all inspection items of the cofferdam are qualified, and adopting red and white paint on the outer side wall plate as a water level line mark.
3. The method for constructing a double-wall steel suspension box cofferdam also used as a drilling platform as claimed in claim 2, wherein in the step S1, the assembly of the double-wall steel suspension box cofferdam is performed, the side plate is divided into a plurality of unit blocks according to the structural characteristics of the cofferdam, the unit blocks are assembled one by one in the assembly area after being processed and formed in the manufacturing area, and the inner and outer wall plates are staggered during the block division and are not blocked at the position of the bay plate.
4. The method for constructing the double-wall steel suspension box cofferdam serving as the drilling platform as claimed in claim 1, wherein the cofferdam is launched into the pier position in step S2 by integral floating, and the initial positioning is performed by using a positioning boat and anchor pier positioning method, and meanwhile, the measured data is collected at the top of the steel cofferdam in real time, and the anchoring system is adjusted repeatedly until the tail position of the cofferdam is accurate to achieve the initial positioning; and after the preliminary positioning is finished, inserting and beating the positioning steel casing by using the floating crane, inserting and beating a first steel casing, finely adjusting the position of the cofferdam, and then sequentially inserting and beating the other positioning steel casings to ensure that the cofferdam is accurately positioned within an error range.
5. The method for constructing the double-wall steel suspension box cofferdam serving as the drilling platform as claimed in claim 4, wherein after the cofferdam is launched in step S2, when the tug boat slows down to drag the cofferdam to a certain distance from the pier, the steel wire rope connected with the anchor pier system is used to initially position the cofferdam, and after the jack connected with the anchor pier is used to accurately position the cofferdam, the positioning steel casing is inserted.
6. The method for constructing the double-wall steel suspension box cofferdam serving as the drilling platform as claimed in claim 1, wherein after the cofferdam is positioned in step S3, the cofferdam is slowly sunk by uniformly injecting water into the bulkhead and the side wall, the draft is stabilized to the designed height from floating, the pile is hung and fixed, the non-directional steel casing is inserted and driven, the vertical support is formed by the upper guide ring and the bracket of the positioning pile, and the lower guide ring and the steel pile are wedged and compacted by the wedge block, so that the steel cofferdam and the positioning steel casing form a whole.
7. The construction method of the double-wall steel suspension box cofferdam doubling as the drilling platform as claimed in claim 1, wherein the drilling in step S4 is carried out by the construction of the supporting platform on the top of the double-wall steel suspension box cofferdam; arranging inclined struts on the steel cofferdam and the steel pile casings, laying longitudinal and transverse distribution beams and steel plates to form a supporting platform, performing cast-in-place bored pile construction after the construction of the drilling supporting platform is completed, and constructing according to the sequence of firstly constructing a non-positioning pile and then constructing a positioning pile in the drilling sequence; in the construction process, cofferdam pile hanging is carried out immediately after one pile is finished.
8. The construction method of the double-wall steel suspension box cofferdam doubling as the drilling platform as claimed in claim 7, wherein the construction of the drilling supporting platform in step S4 is carried out at the top of the double-wall steel suspension box cofferdam, and the supporting platform is composed of an inclined support on the steel cofferdam, a support on the steel casing, a longitudinal and transverse distribution beam and a steel plate.
9. The method for constructing a double-walled steel suspension box cofferdam doubling as a drilling platform as claimed in claim 1, it is characterized in that in the step S5, after the cofferdam and the pile casing wall are cleaned, the back cover concrete pouring is carried out, before the back cover in the cofferdam, the concrete in the double wall of the cofferdam is cast for balancing weight, the back cover of the cofferdam pours the areas of the cofferdam symmetrically and hierarchically according to the back bulkhead, the back cover concrete pouring adopts the method of fully distributing the guide pipes to pull out the balls one by one, the middle and the two ends are sequentially carried out in a cabin-by-cabin mode and a block-by-block mode, the pouring in multiple times is finished, each area is from a low, pouring according to the principle of diagonal angle and symmetry, after the bottom sealing concrete reaches a certain strength, carrying out hanging system conversion of the cofferdam, after the cofferdam is in a stable state, carrying out water pumping in the cofferdam, cutting off redundant steel pile casings, dismantling suspenders and pile heads, and carrying out subsequent process construction such as layered pouring of large-volume concrete bearing platforms.
10. The method for constructing the double-wall steel hanging box cofferdam used as a drilling platform as claimed in claim 9, wherein the pouring of the back cover concrete in step S5 is performed by symmetrically layering the cofferdam into the pouring areas according to the bottom compartments, the back cover concrete pouring is performed by a method of pulling balls out one by fully distributing pipes, the pouring is performed by dividing the cofferdam into compartments and blocks in sequence from the middle to the two ends, the pouring is performed by stages, each area is poured according to the principle of diagonal and symmetrical from the low point to the high point, the system conversion of the cofferdam is completed, and the preparation for constructing the bearing platform in the cofferdam is performed.
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| CN201911237071.2A CN110939148A (en) | 2019-12-05 | 2019-12-05 | Construction method of double-wall steel suspension box cofferdam serving as drilling platform |
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| CN201911237071.2A CN110939148A (en) | 2019-12-05 | 2019-12-05 | Construction method of double-wall steel suspension box cofferdam serving as drilling platform |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021232484A1 (en) * | 2020-05-19 | 2021-11-25 | 中交第四航务工程局有限公司 | Underwater positioning method for large-diameter ultra-long hdpe pipe |
| CN114934529A (en) * | 2022-07-11 | 2022-08-23 | 山东省水电设备厂 | Dry land operation-based construction method for front row pile pier of sewage disposal system and sewage disposal system |
| CN115492141A (en) * | 2022-10-21 | 2022-12-20 | 中铁二院工程集团有限责任公司 | Steel suspension box cofferdam structure and bottom plate and construction method thereof |
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| WO2021232484A1 (en) * | 2020-05-19 | 2021-11-25 | 中交第四航务工程局有限公司 | Underwater positioning method for large-diameter ultra-long hdpe pipe |
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| CN115492141B (en) * | 2022-10-21 | 2024-01-30 | 中铁二院工程集团有限责任公司 | Steel suspended box cofferdam structure, bottom plate thereof and construction method |
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