CN219219073U - Cofferdam water retaining structure for beach bridge foundation construction - Google Patents
Cofferdam water retaining structure for beach bridge foundation construction Download PDFInfo
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- CN219219073U CN219219073U CN202320258576.2U CN202320258576U CN219219073U CN 219219073 U CN219219073 U CN 219219073U CN 202320258576 U CN202320258576 U CN 202320258576U CN 219219073 U CN219219073 U CN 219219073U
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Abstract
The application relates to a beach bridge foundation construction is with cofferdam manger plate structure, it includes: the water retaining cofferdam comprises a ground water retaining section and an underground inserting section; the earth-retaining cofferdam is arranged in the water-retaining cofferdam and comprises a ground earth-retaining section and an underground earth-retaining section, and an installation space is formed between the ground earth-retaining section and the ground water-retaining section; an interlayer platform disposed in the installation space. The interlayer platform is used as an internal support of the water retaining cofferdam, and jointly withstands the water head pressure at a high water level with the water retaining cofferdam, and is used as a ground foundation and a mechanical operation platform during construction of the retaining cofferdam; therefore, the interlayer platform is used as a mechanical construction channel to carry out construction of a bored pile foundation and a retaining cofferdam, and then the bearing platform construction can be carried out after precipitation, so that the consumption of a bored platform structure and the consumption of back cover concrete during the construction of the bored pile are saved in the construction process, and the construction on water is changed into land construction, so that the construction is more convenient.
Description
Technical Field
The application relates to the field of bridge construction, in particular to a cofferdam water retaining structure for beach bridge foundation construction.
Background
The bridge foundation is the lowest part of the bridge structure which is in direct contact with the foundation at present, and is an important component part of the lower structure of the bridge. A portion of the formation that is subjected to the load from the foundation is called the foundation. After the foundation and the foundation are subjected to various loads, the foundation and the foundation generate stress and deformation, and in order to ensure the normal use and safety of the bridge, the foundation and the foundation must have enough strength and stability, and the deformation should be within an allowable range.
In some related technologies, the common construction method of the foundation in the construction process of the large-span bridge foundation is as follows: firstly, erecting a drilling platform, then, utilizing the drilling platform to perform drilling pile construction, then, setting a cofferdam, after bottom sealing concrete in the cofferdam, pumping water, and finally, performing bearing platform construction. But has the following problems:
in the construction mode, a large number of steel structures are needed to be put into for erecting a drilling platform, the cofferdam is also needed to be provided with back cover concrete, the temporary structures are more to be put into, and the working procedures are complicated. Therefore, how to avoid erecting a drilling platform and save the consumption of back cover concrete is a problem to be solved.
Disclosure of Invention
The embodiment of the application provides a cofferdam water retaining structure for beach bridge foundation construction to solve among the related art when the beach bridge foundation is under construction, need throw in a large amount of steel construction and carry out the problem of erecting of drilling platform.
In a first aspect, a cofferdam water retaining structure for beach bridge foundation construction is provided, which comprises:
the water retaining cofferdam comprises a ground water retaining section and an underground insertion section, and the elevation of the ground water retaining section relative to a ground line is larger than a first design water level;
the earth-retaining cofferdam is arranged in the water-retaining cofferdam and comprises a ground earth-retaining section and an underground earth-retaining section, and an installation space is formed between the ground earth-retaining section and the ground water-retaining section;
the interlayer platform is arranged in the installation space, and the inner side and the outer side of the interlayer platform are respectively propped against the water retaining cofferdam and the retaining cofferdam; the elevation of the ground soil retaining section and the interlayer platform relative to the ground line is larger than the second design water level and smaller than the first design water level.
In some embodiments, the water dam comprises a plurality of connected sheet pile structures.
In some embodiments, the retaining cofferdam comprises an inner support and an outer support, wherein the outer support is of a sheet pile structure, and the inner support comprises ring beams and supporting pipes; the sheet pile structure is connected with the ring beam.
In some embodiments, the ring beam is rectangular in shape, and the four corners of the ring beam are provided with first reinforcing rods, and second reinforcing rods are arranged between two opposite side walls.
In some embodiments, a slope trestle is arranged on the interlayer platform, and a rigid panel is laid on the top surface of the interlayer platform or hardened.
In some embodiments, the ramp bridge comprises:
the bearing beam comprises a bailey beam or a longitudinal beam;
the high steel pipe piles are connected to the bottom of the spandrel girder and distributed along the length direction of the spandrel girder; the elevation of the tops of the high steel pipe piles relative to the interlayer platform is gradually reduced or increased along the length direction of the bailey beam;
and the bridge deck is paved on the top of the spandrel girder.
The beneficial effects that technical scheme that this application provided brought include:
the embodiment of the application provides a cofferdam water retaining structure for beach bridge foundation construction, wherein when the cofferdam water retaining structure is used, an operation area is arranged at the periphery of a bearing platform construction area, and a water retaining cofferdam is arranged at the periphery of the operation area; the water retaining cofferdam comprises a ground water retaining section and an underground insertion section, and the elevation of the ground water retaining section relative to a ground line is larger than a first design water level; the earth-retaining cofferdam is arranged in the water-retaining cofferdam and comprises a ground earth-retaining section and an underground earth-retaining section, and an installation space is formed between the ground earth-retaining section and the ground water-retaining section; the interlayer platform is arranged in the installation space, and the inner side and the outer side of the interlayer platform are respectively propped against the water retaining cofferdam and the retaining cofferdam; the elevation of the ground soil retaining section and the interlayer platform relative to the ground line L is larger than the second design water level and smaller than the first design water level.
Through the arrangement, the operation equipment can be installed on the interlayer platform, the interlayer platform is used as an internal support of the water retaining cofferdam, and jointly withstands the water head pressure at a high water level with the water retaining cofferdam, and meanwhile, the interlayer platform is also used as a ground foundation and a mechanical operation platform during construction of the soil retaining cofferdam, and a drilling pile platform does not need to be additionally erected, so that the safety of the excavation process of the soil retaining cofferdam is ensured. The water level in the retaining cofferdam is reduced to the level in the soil retaining cofferdam, then a foundation pit is excavated, a foundation pit cushion layer is constructed in a dry operation mode, and finally, bearing platform construction is carried out without the operation of back cover concrete, so that the drilling platform structure and the back cover concrete consumption during the construction of the drilling pile are saved, the water construction is changed into land construction, and the construction is more convenient.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a top view of a cofferdam water retaining structure for beach bridge foundation construction provided in an embodiment of the present application;
fig. 2 is an installation schematic diagram of a cofferdam water retaining structure for beach bridge foundation construction in construction, which is provided by the embodiment of the application.
In the figure: 1. a water retaining cofferdam; 2. a retaining cofferdam; 3. an interlayer platform; 4. slope trestle; 5. bearing platform; 6. a second reinforcing rod; 7. a first reinforcing rod; h1, a first design water level; l, land line; h3, a second design water level; h2, the ground line elevation.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
The applicant finds that by using a common bridge foundation construction method in actual construction, when constructing a beach, a temporary structure needs to be erected, the construction needs to be dismantled after completion, collapse easily occurs during excavation, water enters into a cofferdam when flood season and tide are encountered, water is pumped for many times, and water seepage has a great influence on the quality of back cover concrete, so that the problems are based on the above.
The embodiment of the application provides a cofferdam water retaining structure for beach bridge foundation construction and a construction method, which are used for solving the problem that a large number of steel structures are required to be put into for erecting a drilling platform when a bridge foundation is constructed on the beach in the related art.
Referring to fig. 1 and 2, a beach bridge foundation construction method includes the following steps:
s1, setting an operation area at the periphery of a bearing platform construction area, and setting a water retaining cofferdam 1 at the periphery of the operation area, wherein the top standard height of the water retaining cofferdam 1 is more than 0.5m above the water level which is met by ten years;
s2, performing sand filling island construction in an operation area, and filling the beach ground elevation above a normal water line in the construction period to form an interlayer platform 3;
s3, installing operation equipment on the interlayer platform 3, constructing a retaining cofferdam 2 in a bearing platform construction area and an operation area by using the operation equipment, and constructing a bored pile foundation in the operation area to form a cofferdam water retaining structure for beach bridge foundation construction; wherein the top standard height of the retaining cofferdam 2 is consistent with the elevation of the interlayer platform 3; the working equipment can be a slope trestle 4; constructing a slope trestle 4 serving as a connecting channel between a construction channel and an interlayer platform 3, paving a rigid panel in the whole area of the interlayer platform 3 serving as a mechanical construction channel, and constructing a bored pile foundation and a retaining cofferdam 2;
s4, performing precipitation operation in the retaining cofferdam 2, and lowering the water level of the retaining cofferdam 2 to at least 0.5m below the elevation of the bottom of the bearing platform; and excavating a bearing platform construction area by using operation equipment, and then carrying out bearing platform construction to form a bridge foundation.
S5, dismantling the water retaining cofferdam 1 and the soil retaining cofferdam 2.
The construction steps form a water retaining cofferdam 1, a soil retaining cofferdam 2 and an interlayer platform 3 for the installation of operation equipment, wherein the interlayer platform 3 is used as an internal support of the water retaining cofferdam 1, and jointly withstands the water head pressure at a high water level with the water retaining cofferdam 1 and is used as a ground foundation and a mechanical operation platform for the construction of the soil retaining cofferdam 2; the retaining cofferdam 2 ensures the safety of the excavation process and avoids the risk of collapse. In addition, the two-layer water retaining structure formed by the water retaining cofferdam 1, the soil retaining cofferdam 2 and the interlayer platform 3 prevents external water from penetrating into the bearing platform construction area, and the water construction becomes land construction, so that the operation and quality of the bottom sealing concrete are ensured.
Because temporary structures such as a bored pile platform and the like do not need to be erected in the steps, the bearing platform construction can be carried out without setting back cover concrete, the boring platform structure and the back cover concrete dosage during the bored pile construction are saved, the water construction is changed into land construction, and the construction is more convenient. Therefore, the construction quality and the progress are not affected, the investment of a temporary structure is reduced, and the cost is reduced.
In some preferred embodiments, excavating the cap construction area comprises the following specific steps:
precipitation is carried out in the retaining cofferdam 2 until the water level is reduced below the design position of the bottom surface of the bearing platform, so that the bearing platform construction can be carried out without setting back cover concrete;
excavating a bearing platform construction area to form a foundation pit, and continuously dewatering in the construction process to ensure that the water level is at least reduced to 0.5 meter below the elevation of the bottom of the bearing platform; and a cushion layer is arranged at the bottom of the foundation pit in dry operation construction.
Through the mode, the inside of the foundation pit is dry, the operation of bottom sealing concrete is not needed, and the cushion layer is directly arranged, so that the concrete consumption in the process of building a bridge foundation is reduced, and the cost is reduced.
In some preferred embodiments, in order to facilitate the entry of the working equipment onto the inter-layer platform 3 and the walking of the constructors on the water retaining cofferdam 1 and the earth retaining cofferdam 2, the following arrangement is made:
a slope trestle 4 is arranged on the interlayer platform 3, and a rigid panel is paved on the top surface of the interlayer platform 3 or hardened to form a construction channel; and (3) conveying the operation equipment to the interlayer platform 3 by using the slope trestle 4, and constructing the bored pile foundation and the retaining cofferdam 2.
Wherein, slope landing stage 4 includes: the bearing beam comprises a bailey beam or a longitudinal beam; high steel pipe piles and bridge decks; the high steel pipe piles are connected to the bottom of the spandrel girder and distributed along the length direction of the spandrel girder; the elevation of the tops of the high steel pipe piles relative to the interlayer platform 3 is gradually reduced or increased along the length direction of the bailey beam; and the bridge deck is paved on the top of the spandrel girder. And the formed slope trestle 4 is used as a connecting channel between the construction channel and the interlayer platform 3 to carry out construction of the bored pile foundation and the inner cofferdam.
The application also provides a beach bridge foundation construction is with cofferdam manger plate structure, it includes: the water retaining cofferdam 1, the soil retaining cofferdam 2 and the interlayer platform 3.
The water retaining cofferdam 1 comprises a ground water retaining section and an underground insertion section, and the elevation of the ground water retaining section relative to a ground line L is larger than a first design water level H1; the first design water level H1 is a ten-year-first high water level or a hundred-year-first water level; the elevation of the specific ground water retaining section relative to the ground line L is higher than the elevation of the first design water level H1 by more than 0.5 m.
The earth-retaining cofferdam 2 is arranged in the water-retaining cofferdam 1 and comprises a ground earth-retaining section and an underground earth-retaining section, and an installation space is formed between the ground earth-retaining section and the ground water-retaining section; the vertical length of the underground soil retaining section is greater than that of the underground inserting section, and the vertical length of the ground water retaining section is greater than that of the ground soil retaining section, so that the influence of flood season and tide is avoided.
The interlayer platform 3 is arranged in the installation space, and the inner side and the outer side of the interlayer platform are respectively propped against the water retaining cofferdam 1 and the retaining cofferdam 2; the elevation of the ground soil retaining section and the interlayer platform relative to the ground line L is larger than the second design water level H3 and smaller than the first design water level H1, and the second design water level H3 is a normal water level line in the construction period; the ground line level of the ground line L is H2 shown in fig. 2. The top surface of the interlayer platform 3 is paved with a rigid panel or hardened to be used as a mechanical construction channel, so that the personnel and mechanical approach operation is satisfied. The interlayer platform 3 adopts sand filling to build islands to fill the beach ground elevation above the normal water line in the construction period.
Through the arrangement, the operation equipment can be installed on the interlayer platform 3, the interlayer platform 3 is used as an internal support of the water retaining cofferdam 1, and can jointly resist the water head pressure when the water retaining cofferdam 1 is at a high water level, and meanwhile, the water head pressure is also used as a ground foundation and a mechanical operation platform when the soil retaining cofferdam 2 is constructed, a drilling pile platform does not need to be additionally erected, and the soil retaining cofferdam 2 ensures the safety of the excavation process and avoids collapse.
In addition, the two-layer water retaining structure formed by the water retaining cofferdam 1 and the soil retaining cofferdam 2 has the following functions in limiting the elevation of the water retaining cofferdam 1, the soil retaining cofferdam 2 and the interlayer platform 3: the influence of flood season and tide is avoided to avoid outside water infiltration cushion cap construction area in, consequently can not influence the problem of construction quality and progress, also avoided drilling platform to set up, reduce temporary structure's input, alleviate the cost.
In some preferred embodiments, the water retaining cofferdam 1 comprises a plurality of connected sheet pile structures and is driven into the beach for a certain depth as a water retaining structure for the whole working area.
The retaining cofferdam 2 comprises an inner support and an outer support, wherein the outer support is of a sheet pile structure, and the inner support comprises ring beams and supporting pipes; the sheet pile structure is connected with the ring beam.
Further, the shape of the ring beam is rectangular, the first reinforcing rods 7 are arranged on the four corners of the ring beam, the second reinforcing rods 6 are arranged between the two opposite side walls, and the strength of the sheet pile is higher when the sheet pile is used for retaining soil due to the arrangement of the first reinforcing rods 7 and the second reinforcing rods 6, so that collapse in the excavating process is avoided, and the safety is improved.
In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description of the present application and simplification of the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
It should be noted that in this application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. 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 application. Thus, the present application 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. Cofferdam water retaining structure is used in construction of beach bridge foundation, its characterized in that includes:
the water retaining cofferdam (1) comprises a ground water retaining section and an underground insertion section, and the elevation of the ground water retaining section relative to a ground line (L) is larger than a first design water level (H1);
the earth-retaining cofferdam (2) is arranged in the water-retaining cofferdam (1) and comprises a ground earth-retaining section and an underground earth-retaining section, wherein an installation space is formed between the ground earth-retaining section and the ground water-retaining section;
an interlayer platform (3) which is arranged in the installation space and the inner side and the outer side of which are respectively propped against the water retaining cofferdam (1) and the soil retaining cofferdam (2); the elevation of the earth retaining section and the interbed platform relative to the earth line (L) is greater than the second design water level (H3) and less than the first design water level (H1).
2. The cofferdam water retaining structure for beach bridge foundation construction of claim 1, wherein:
the water retaining cofferdam (1) comprises a plurality of connected sheet pile structures.
3. The cofferdam water retaining structure for beach bridge foundation construction of claim 1, wherein:
the retaining cofferdam (2) comprises an inner support and an outer support, wherein the outer support is of a sheet pile structure, and the inner support comprises a ring beam and a supporting pipe; the sheet pile structure is connected with the ring beam.
4. A cofferdam water stop structure for beach bridge foundation construction as recited in claim 3, wherein:
the ring beam is rectangular in shape, the four corners of the ring beam are provided with first reinforcing rods (7), and second reinforcing rods (6) are arranged between two opposite side walls.
5. The cofferdam water retaining structure for beach bridge foundation construction of claim 1, wherein:
the interlayer platform (3) is provided with a slope trestle (4), and the top surface of the interlayer platform (3) is paved with a rigid panel or is subjected to hardening treatment.
6. Cofferdam water stop structure for beach bridge foundation construction as claimed in claim 5, characterized in that the slope trestle (4) comprises:
the bearing beam comprises a bailey beam or a longitudinal beam;
the high steel pipe piles are connected to the bottom of the spandrel girder and distributed along the length direction of the spandrel girder; the elevation of the tops of the high steel pipe piles relative to the interlayer platform (3) is gradually reduced or increased along the length direction of the bailey beam;
and the bridge deck is paved on the top of the spandrel girder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320258576.2U CN219219073U (en) | 2023-02-20 | 2023-02-20 | Cofferdam water retaining structure for beach bridge foundation construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320258576.2U CN219219073U (en) | 2023-02-20 | 2023-02-20 | Cofferdam water retaining structure for beach bridge foundation construction |
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| CN219219073U true CN219219073U (en) | 2023-06-20 |
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| CN202320258576.2U Active CN219219073U (en) | 2023-02-20 | 2023-02-20 | Cofferdam water retaining structure for beach bridge foundation construction |
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