CN111962536A - Round combined cofferdam of seasonal water area bridge rock-socketed foundation and construction method - Google Patents
Round combined cofferdam of seasonal water area bridge rock-socketed foundation and construction method Download PDFInfo
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- CN111962536A CN111962536A CN202010755934.1A CN202010755934A CN111962536A CN 111962536 A CN111962536 A CN 111962536A CN 202010755934 A CN202010755934 A CN 202010755934A CN 111962536 A CN111962536 A CN 111962536A
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- cofferdam
- pile
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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
- E02D27/12—Pile foundations
- E02D27/14—Pile framings, i.e. piles assembled to form the substructure
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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
- E02D27/42—Foundations for poles, masts or chimneys
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
Abstract
The invention discloses a circular combined cofferdam for construction of a rock-socketed foundation of a seasonal water area bridge and a construction method. The circular secant pile cofferdam is formed by staggered arrangement of secant piles A and secant piles B, the top beam is of a reinforced concrete structure, the secant piles A and the secant piles B are connected into a whole through anchor bars reserved at the tops of the secant piles, the double-wall steel cofferdam is of a traditional structure in the prior art, the bottom of the double-wall steel cofferdam is hollow and is connected with the top beam, and the connecting section is provided with shear steel bars and poured with cabin-clamping concrete for water stop. The secant pile A is a plain concrete pile with an anchor bar at the top or a reinforced concrete pile with a rectangular reinforcement cage, and the secant pile B is a reinforced concrete pile with a circular reinforcement cage or a reinforced concrete pile with a rectangular reinforcement cage. The invention has short construction period, low construction risk, less resource consumption and low construction cost.
Description
Technical Field
The invention belongs to the field of cofferdam construction of bridge foundations, and particularly relates to a circular combined cofferdam capable of being continuously constructed in a flood period with island building conditions in a dry season and a construction method.
Background
The construction of the underwater bearing platform of the bridge needs to utilize a cofferdam as a supporting structure to form a dry working environment. The construction of the underwater bearing platform is influenced by the hydrogeological conditions at the bridge site, a plurality of cofferdam structural forms are derived, wherein the secant pile cofferdam is suitable for the operation environment of shallow water areas or underground seepage, and the double-wall steel cofferdam is suitable for the operation environment with the water depth of more than 10 m. The bridge foundation construction in the seasonal water area has the distinct characteristics that the water level is low in a dry season, even a river bed is exposed, the water level is high in a flood season, even a pier column needs to be constructed with a plurality of sections to discharge water. The secant pile and the double-wall steel cofferdam are combined to form the combined cofferdam, the bridge pile foundation and the secant pile cofferdam can be synchronously constructed in the dry season, the high double-wall steel cofferdam is connected with the combined cofferdam, the bearing platform and the pier stud can be continuously constructed in the flood season, and the construction efficiency is higher compared with that of the traditional single cofferdam structure. The limit of navigation condition receives, and the appearance of bridge embedded rock cushion cap is comparatively general, and the double-walled steel cofferdam is compared to the combination cofferdam and can be avoided blasting under water, and the earth and rockfill excavation under the large surface water also can avoid setting up construction platform on water, and is more economical, high-efficient. The existing combined cofferdam technology has a rectangular shape and an 8-shaped shape, such as patent publication numbers CN 209194552U, CN209941708U and CN110144915A, the configuration of the combined cofferdam is mostly adapted to the shape of a bearing platform, and when the bearing platform is circular or square, the circular combined cofferdam provided by the invention is more economical. The existing combined cofferdam technology for constructing the underwater foundation has the following problems:
1. the rectangular combined cofferdam provided in the patent with the publication number of CN 209194552U is suitable for perennial deep water bare rock foundations, the seasonal underwater foundation provided by the invention has poor navigation conditions in a dry period, the hoisting equipment on water is limited, and the double-wall steel cofferdam is difficult to float and install.
2. The rectangular combined cofferdam proposed in the patent with the publication number of CN 209194552U needs to be provided with an overwater construction platform to construct an underwater snap pile, and the number of working procedures is large.
3. The double-wall steel cofferdam in the rectangular combined cofferdam proposed in the patent with publication number CN 209194552U needs to be provided with a hollow connecting section at the bottom, concrete pouring holes are formed in the connecting section, and a closed steel plate is arranged at the bottom of the conventional section, so that the construction details are more.
4. The existing combined cofferdam has internal supports, and needs to consume materials and install time.
5. The adaptability of the existing combined cofferdam and a circular cushion cap or a square cushion cap is poor.
Disclosure of Invention
Therefore, in order to solve the above-mentioned disadvantages, the present invention provides a circular combined cofferdam of a quaternary water-area bridge rock-socketed foundation and a construction method thereof.
The invention is realized in such a way that a round combined cofferdam of a seasonal watershed bridge rock-socketed foundation is constructed, and the round combined cofferdam comprises a round secant pile cofferdam, a crown beam at the top of a secant pile and a round double-wall steel cofferdam arranged on the crown beam; it is characterized in that; the circular secant pile cofferdam is formed by staggered arrangement of secant piles A and secant piles B, the crown beam is of a reinforced concrete structure, the secant piles A and the secant piles B are connected into a whole through anchor bars reserved at the tops of the secant piles, the bottom of the circular double-wall steel cofferdam is hollow and is connected with the crown beam, and the connecting section is provided with shear steel bars and poured with cabin-clamping concrete for stopping water; the connecting section is provided with shear steel bars and poured with sandwiched concrete for seepage prevention; the secant pile A is a plain concrete pile with an anchor bar at the top or a reinforced concrete pile with a rectangular reinforcement cage, and the secant pile B is a reinforced concrete pile with a circular reinforcement cage or a reinforced concrete pile with a rectangular reinforcement cage.
The round combined cofferdam of the seasonal water area bridge rock-socketed foundation is characterized in that the combined cofferdam is a circular combined cofferdam; the secant pile A is a plain concrete pile with an anchor bar at the top or a reinforced concrete pile with a rectangular reinforcement cage, and the secant pile B is a reinforced concrete pile with a circular reinforcement cage or a reinforced concrete pile with a rectangular reinforcement cage.
The round combined cofferdam of the seasonal water area bridge rock-socketed foundation is characterized in that the combined cofferdam is a circular combined cofferdam; the width of the cross section of the crown beam is larger than the distance between the inner wall plate and the outer wall plate of the double-wall steel cofferdam, a space is reserved for the embedded part, and the top of the crown beam is provided with an annular steel plate embedded part which is welded with the inner wall plate and the outer wall plate of the double-wall steel cofferdam.
The round combined cofferdam of the seasonal water area bridge rock-socketed foundation is characterized in that the combined cofferdam is a circular combined cofferdam; the projection of the center line of the circular secant pile cofferdam, the crown beam and the circular double-wall steel cofferdam on the plane is circular.
The round combined cofferdam of the seasonal water area bridge rock-socketed foundation is characterized in that the combined cofferdam is a circular combined cofferdam; the circular double-wall steel cofferdam comprises a wall plate unit consisting of an inner wall plate, an outer wall plate and wall plate stiffening ribs, wherein the wall plate unit is connected through a circumferential truss to form a block piece, the block piece is connected to form the circular double-wall steel cofferdam integrally, and a vertical partition plate is arranged between the wall plates to divide the double-wall steel cofferdam into a plurality of chambers.
A construction method of a round combined cofferdam of a seasonal water area bridge rock-socketed foundation is characterized in that; comprises the following steps:
step one, building an island in a dry season to form an operation platform construction main structure pile foundation, constructing an secant pile cofferdam on an island surface according to the shape and size of the cofferdam, and synchronously constructing the main structure pile foundation and the secant pile;
step two, processing the double-wall steel cofferdam block piece on site or in a factory;
thirdly, chiseling pile head concrete after the construction of the secant pile is finished, constructing a crown beam and an embedded part on the pile head concrete, and anchoring the secant pile head reinforcing steel bars and anchor bars with the crown beam;
step four, assembling and splicing double-wall steel cofferdam blocks on the crown beams, welding the inner and outer wall plates of the steel cofferdam with the embedded parts on the crown beams, and pouring concrete in the clamping bins of the connecting sections of the steel cofferdam for seepage prevention;
and fifthly, excavating foundation pits in the cofferdam, pouring cushion concrete, and constructing a bearing platform and a pier stud. Excavation of the foundation pit in the cofferdam can be synchronously performed with assembly of the double-wall steel cofferdam.
The invention has the following advantages: the invention discloses a circular combined cofferdam for construction of a rock-socketed foundation of a seasonal water area bridge and a construction method. The circular secant pile cofferdam is formed by staggered arrangement of secant piles A and secant piles B, the top beam is of a reinforced concrete structure, the secant piles A and the secant piles B are connected into a whole through anchor bars reserved at the tops of the secant piles, the double-wall steel cofferdam is of a traditional structure in the prior art, the bottom of the double-wall steel cofferdam is hollow and is connected with the top beam, and the connecting section is provided with shear steel bars and poured with cabin-clamping concrete for water stop. The secant pile A is a plain concrete pile with an anchor bar at the top or a reinforced concrete pile with a rectangular reinforcement cage, and the secant pile B is a reinforced concrete pile with a circular reinforcement cage or a reinforced concrete pile with a rectangular reinforcement cage. The invention has short construction period, low construction risk, less resource consumption and low construction cost.
Drawings
FIG. 1 is a vertical layout view of the circular combined cofferdam of the present invention;
FIG. 2 is an enlarged schematic view of FIG. 1 at A;
FIG. 3 is a plan view of a patent bitten pile of the present invention;
FIG. 4 is an enlarged schematic view corresponding to B in FIG. 3;
FIG. 5 is a plan view of a patent crown according to the present invention;
fig. 6 is a plan layout view of the circular double-wall steel cofferdam of the invention.
Wherein: 1-circular secant pile cofferdam, 2-secant pile A, 3-secant pile B, 4-rectangular steel reinforcement cage, 5-circular steel reinforcement cage, 6-crown beam, 7-crown beam embedded part, 8-circular double-wall steel cofferdam, 9-wallboard unit, 10-circumferential truss, 11-clamping concrete, 12-compartment plate, 13-compartment, 14-island body, 15-main pile foundation, 16-bearing platform, 17-pier column, 18-leveling layer concrete and 19-rock stratum.
Detailed Description
The present invention will be described in detail with reference to fig. 1 to 6, and the technical solutions in the embodiments of the present invention will be clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 6, the invention provides a round combined cofferdam of a quarterly water-area bridge rock-socketed foundation by improvement, which comprises a round snap pile cofferdam 1, a crown beam 6 at the top of the snap pile and a round double-wall steel cofferdam 8 arranged on the crown beam. The circular secant pile cofferdam 1 is formed by staggered arrangement of secant piles A2 and secant piles B3, the crown beam 6 is of a reinforced concrete structure, the secant piles A2 and the secant piles B3 are connected into a whole through anchor bars reserved at the tops of the secant piles, the circular double-wall steel cofferdam 8 is of a traditional structure in the prior art, the bottom of the circular double-wall steel cofferdam is hollow and connected with the crown beam 6, and the connecting sections are provided with shear steel bars and poured with cabin-clamping concrete 11 for seepage prevention. Secant pile A2 is the plain concrete pile that the anchor bar was established at the top or sets up the reinforced concrete pile of rectangle steel reinforcement cage 4, secant pile B3 is the reinforced concrete pile that sets up circular steel reinforcement cage 5 or sets up the reinforced concrete pile of rectangle steel reinforcement cage 4.
As shown in figure 1, during the implementation, earth and stones are filled on the river bed surface at the pier position in the dry season to form an island 14 serving as a construction platform of a main pile foundation 15 and a circular secant pile cofferdam 1, the elevation of the top surface of the island 14 is determined according to the water level change condition of the years and the available construction time, and the principle is that the excavation of foundation pits of the main pile foundation 15, the circular combined cofferdam and a bearing platform 16 can be completed in the dry season. And constructing a main pile foundation 15 on the island body 14 by adopting conventional pore-forming equipment, and synchronously constructing the circular secant pile cofferdam 1, wherein the blocks of the circular double-wall steel cofferdam 8 can be synchronously manufactured on the back field. Before the main body pile foundation 15 is finished, the crown beam 6 is constructed in sections according to the site conditions. And after the site is cleaned, excavating a 16-foundation pit of the bearing platform, and synchronously installing 8 circular double-wall steel cofferdams on the top beams 6. And pouring the double-bin concrete 11 according to the installation progress of the circular double-wall steel cofferdam 8. A slag hole is reserved in the circular double-wall steel cofferdam 8, and a dry-place operation space is formed after the pile cap foundation pit is excavated and closed. And cleaning the foundation of the combined cofferdam, pouring leveling layer concrete 18, and continuously constructing a bearing platform 16 and pier studs 17 in sequence in the flood period until water flows out to finish the underwater foundation engineering.
As shown in fig. 3, circular, spud cofferdams 1 alternate in the order of spud a2 followed by spud B3. The rectangular reinforcement cage 4 is adopted when the secant pile A2 must be reinforced according to stress requirements, the size of the rectangular reinforcement cage 4 is smaller than the net distance between the edges of two adjacent piles, and the reinforcement cage is prevented from being damaged in the drilling process of the secant pile B3. The pile bottoms of the round secant pile cofferdam 1 are embedded into the rock stratum 19 to form a closed water-stop space.
As shown in fig. 3-5, before the construction of the crown beam 6, pile heads of the circular secant pile cofferdam 1 are chiseled off, pile head steel bars form a bell mouth, and annular stirrups are installed to anchor the crown beam 6. The crown beam embedded part 7 can be an annular steel plate and anchor bar type embedded part, and is manufactured and embedded in a segmented mode according to the hoisting capacity.
As shown in fig. 6, the circular double-wall steel cofferdam 8 is composed of wall plate units 9, circumferential trusses 10 and partition plates 12, and can be manufactured in a factory or processed on site. The circular double-wall steel cofferdam 8 is divided into a plurality of chambers 13 by the partition boards 12, the single chamber can be conveniently treated when water leakage occurs, and in addition, the vertical rigidity of the circular double-wall steel cofferdam 8 can be enhanced by the partition boards 12. And when the water level difference between the inside and the outside of the cofferdam in the flood period is larger, calculating and determining the water injection elevation in the bin 13.
A construction method of a circular combined cofferdam of a seasonal water area bridge rock-socketed foundation comprises the following steps:
step one, building an island in a dry season to form an operation platform construction main structure pile foundation, constructing an secant pile cofferdam on an island surface according to the shape and the size of the cofferdam, and constructing the main structure pile foundation and the secant pile synchronously.
And step two, processing the double-wall steel cofferdam block piece on site or in a factory.
And thirdly, chiseling pile head concrete after the secant pile is constructed, constructing a crown beam and an embedded part on the pile head concrete, and anchoring the secant pile head reinforcing steel bars and anchor bars with the crown beam.
And fourthly, assembling and splicing double-wall steel cofferdam blocks on the crown beams, welding the inner and outer wall plates of the steel cofferdam with the embedded parts on the crown beams, and pouring concrete in the clamping bins of the connecting sections of the steel cofferdam for seepage prevention.
And fifthly, excavating foundation pits in the cofferdam, pouring cushion concrete, and constructing a bearing platform and a pier stud. Excavation of the foundation pit in the cofferdam can be synchronously performed with assembly of the double-wall steel cofferdam.
The main difference and obvious beneficial effect of the invention compared with the existing combined cofferdam technology are: (1) the invention is suitable for seasonal underwater foundation construction, an operation platform is formed by building islands in a dry season, large-scale water hoisting equipment is not needed, the double-wall steel cofferdam is processed and transported in a factory or a construction field, the double-wall steel cofferdam is assembled at the top of a crown beam in a blocking manner, floating transportation is not needed, and the transportation and hoisting equipment are conventional; (2) the construction method can reduce the erection work of the overwater construction platform; (3) the double-wall steel cofferdam is of a traditional structure in the prior art and is simple in structure; (4) no inner support is arranged; (5) and the adaptability with a circular bearing platform or a square cofferdam is good. The construction method has the advantages of short construction period, low construction risk, less resource consumption and low engineering cost, and has obvious advantages in construction of the rock-socketed foundation of the seasonal water area bridge.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A round combined cofferdam of a seasonal watershed bridge rock-socketed foundation comprises a round secant pile cofferdam (1), a crown beam (6) at the top of a secant pile and a round double-wall steel cofferdam (8) arranged on the crown beam; it is characterized in that; the circular secant pile cofferdam (1) is formed by staggered arrangement of secant piles A (2) and secant piles B (3), the crown beam (6) is of a reinforced concrete structure, the secant piles A (2) and the secant piles B (3) are connected into a whole through anchor bars reserved at the tops of the secant piles, the bottom of the circular double-wall steel cofferdam (8) is hollow and is connected with the crown beam (6), and the connecting section is provided with shear steel bars and poured with cabin-clamping concrete for stopping water; the connecting section is provided with shear steel bars and poured with sandwiched concrete (11) for seepage prevention; secant pile A (2) is the plain concrete pile that the anchor bar was established at the top or sets up the reinforced concrete pile of rectangle steel reinforcement cage (4), secant pile B (3) is the reinforced concrete pile that sets up circular steel reinforcement cage (5) or sets up the reinforced concrete pile of rectangle steel reinforcement cage (4).
2. The round combined cofferdam of the rock-socketed foundation of the seasonal water conservancy project bridge of claim 1, wherein; secant pile A (2) is the plain concrete pile that the anchor bar was established at the top or sets up the reinforced concrete pile of rectangle steel reinforcement cage, secant pile B (3) is the reinforced concrete pile that sets up circular steel reinforcement cage or sets up the reinforced concrete pile of rectangle steel reinforcement cage.
3. The round combined cofferdam of the rock-socketed foundation of the seasonal water conservancy project bridge of claim 1, wherein; the width of the cross section of the crown beam (6) is larger than the distance between the inner wall plate and the outer wall plate of the double-wall steel cofferdam, a space is reserved for the embedded part, and the top of the crown beam is provided with an annular steel plate embedded part which is welded with the inner wall plate and the outer wall plate of the double-wall steel cofferdam.
4. The round combined cofferdam of the rock-socketed foundation of the seasonal water conservancy project bridge of claim 1, wherein; the projection of the center line of the circular secant pile cofferdam (1), the crown beam (6) and the circular double-wall steel cofferdam (8) on the plane is circular.
5. The round combined cofferdam of the rock-socketed foundation of the seasonal water conservancy project bridge of claim 1, wherein; circular double-walled steel cofferdam (8) constitute the wallboard unit by inside and outside wallboard, wallboard stiffening rib, and wallboard unit (9) link to each other through hoop truss (10) and form the piece, and the piece links into whole circular double-walled steel cofferdam, sets up vertical compartment wall (12) between the wallboard and divides double-walled steel cofferdam into a plurality of storehouses (13).
6. A construction method of a round combined cofferdam of a seasonal water area bridge rock-socketed foundation is characterized in that; comprises the following steps:
step one, building an island in a dry season to form an operation platform construction main structure pile foundation, constructing an secant pile cofferdam on an island surface according to the shape and size of the cofferdam, and synchronously constructing the main structure pile foundation and the secant pile;
step two, processing the double-wall steel cofferdam block piece on site or in a factory;
thirdly, chiseling pile head concrete after the construction of the secant pile is finished, constructing a crown beam and an embedded part on the pile head concrete, and anchoring the secant pile head reinforcing steel bars and anchor bars with the crown beam;
step four, assembling and splicing double-wall steel cofferdam blocks on the crown beams, welding the inner and outer wall plates of the steel cofferdam with the embedded parts on the crown beams, and pouring concrete in the clamping bins of the connecting sections of the steel cofferdam for seepage prevention;
fifthly, excavating foundation pits in the cofferdam, pouring cushion concrete, and constructing a bearing platform and a pier stud; excavation of the foundation pit in the cofferdam can be synchronously performed with assembly of the double-wall steel cofferdam.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010755934.1A CN111962536A (en) | 2020-07-31 | 2020-07-31 | Round combined cofferdam of seasonal water area bridge rock-socketed foundation and construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010755934.1A CN111962536A (en) | 2020-07-31 | 2020-07-31 | Round combined cofferdam of seasonal water area bridge rock-socketed foundation and construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113431065A (en) * | 2021-03-23 | 2021-09-24 | 中交一公局集团有限公司 | Rapid construction method and structure of occlusive pile and steel sleeve combined cofferdam |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209194552U (en) * | 2018-10-24 | 2019-08-02 | 湖北工业大学 | A kind of combined cofferdam for bridge foundation construction |
| CN110144915A (en) * | 2019-06-03 | 2019-08-20 | 四川公路桥梁建设集团有限公司 | 8-shaped interlocking pile-double-wall steel combined cofferdam and construction manipulation process |
| CN110172985A (en) * | 2019-06-27 | 2019-08-27 | 四川公路桥梁建设集团有限公司 | A kind of interlocking pile-double-wall steel combined cofferdam connection structure and construction manipulation process |
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2020
- 2020-07-31 CN CN202010755934.1A patent/CN111962536A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209194552U (en) * | 2018-10-24 | 2019-08-02 | 湖北工业大学 | A kind of combined cofferdam for bridge foundation construction |
| CN110144915A (en) * | 2019-06-03 | 2019-08-20 | 四川公路桥梁建设集团有限公司 | 8-shaped interlocking pile-double-wall steel combined cofferdam and construction manipulation process |
| CN110172985A (en) * | 2019-06-27 | 2019-08-27 | 四川公路桥梁建设集团有限公司 | A kind of interlocking pile-double-wall steel combined cofferdam connection structure and construction manipulation process |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113431065A (en) * | 2021-03-23 | 2021-09-24 | 中交一公局集团有限公司 | Rapid construction method and structure of occlusive pile and steel sleeve combined cofferdam |
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