CN111827322B - Steel hanging box device for checking and maintaining underwater bearing platform of existing bridge - Google Patents
Steel hanging box device for checking and maintaining underwater bearing platform of existing bridge Download PDFInfo
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- CN111827322B CN111827322B CN202010730477.0A CN202010730477A CN111827322B CN 111827322 B CN111827322 B CN 111827322B CN 202010730477 A CN202010730477 A CN 202010730477A CN 111827322 B CN111827322 B CN 111827322B
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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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Abstract
A steel hanging box device for checking and maintaining an existing bridge underwater bearing platform is a rectangular steel box body with an opening at the upper part, and comprises side plates and a bottom plate; the steel hanging box device is formed by combining two long side plates, two short side plates and a bottom plate; the middle part of the length of the long side plate is divided into two parts with the same shape and size, a bolt structure is arranged at the divided part, and the two divided side plates are connected through the bolt structure; the bottom plate is respectively connected with the long side plate and the short side plate; the middle part of the bottom plate is preset with a vacancy which comprises an area occupied between a pile foundation hole and a pile foundation hole; the bottom plate is separated from the middle part in the length direction, and the steel hanging box is divided into two parts which are connected by means of a bolt structure. The steel hanging box device is designed into a left part and a right part, long side plates of the two parts are connected by adopting a bolt structure, and a bottom plate is matched with a pile foundation below an underwater bearing platform, so that the problem that the existing bridge underwater bearing platform and a pier stud cannot be subjected to drainage construction for a long time is solved, the steel hanging box device can be repeatedly used, and the construction cost is reduced.
Description
Technical Field
The invention relates to a steel hanging box device for checking and maintaining an existing bridge underwater bearing platform, and belongs to the technical field of bridge construction.
Background
When constructing bridge piers, pillars, and bearing platforms in water, a cofferdam is usually manufactured in advance, then water in the cofferdam is pumped out, and then the bearing platforms and the pillars are constructed.
The steel suspension box cofferdam is of a bottom structure, is suspended in water after sinking to a designed height, is sealed with underwater concrete after the construction of the drilled pile is finished, and forms the cofferdam after drainage. The construction of the steel suspension box cofferdam is also divided into a pile-first weir-second method and a weir-first pile-second method.
The steel suspension box cofferdam is a box-shaped structure used as a waterproof structure when a foundation of a water pier is built. The planar shape of the steel suspension box cofferdam is mostly circular, rectangular or polygonal, and the side wall plates are mostly steel structures with hollow sandwich walls. The steel suspension box is of a suspension structure, and the bottom of the steel suspension box does not touch a riverbed after sinking, so the steel suspension box is provided with a bottom plate. At present, the deep water high pile cap construction is widely applied, and the structure of the deep water high pile cap construction mainly comprises four parts, namely a side plate, a bottom plate, an inner support and a suspension system, as shown in figure 2.
After the deepwater pile foundation is completed, the steel suspension box is installed and placed by using hoisting equipment, so that the whole steel suspension box (and later back cover concrete) is suspended at the top of a steel pile casing of the pile foundation, then the underwater concrete is poured to back cover, after the back cover concrete forms strength, the steel suspension box is combined with the back cover concrete, and is anchored on the steel pile casing of the pile foundation through concrete, after water is pumped out, the original steel suspension box suspension system is removed, and then a series of bearing platforms and piers (columns) are constructed.
With the increasingly wide application of pile foundations, bridge construction also changes the ground coverage in a turning manner, and bridges across rivers and the seas are continuously emerging, the pile foundations are mostly adopted for the bridge construction, then a bearing platform is built below the water surface, and then piers (columns) are constructed, namely the bearing platform and part of the piers (piles) are below the normal water level.
The pile foundation is a foundation form with high bearing capacity and wide application range, and consists of a plurality of piles (called pile group) buried in the foundation and the pile group which are combined to work together. The upper part of the bridge pier is connected with all the piles into a whole by the bearing platform, and piers or columns are built on the bearing platform to form a complete bridge pier platform system.
Since many of these platforms are located below the normal water level, a cofferdam is required for water-proof construction during construction. Therefore, various types of steel pouring boxes or steel hanging boxes are produced, but the current steel pouring boxes or steel hanging boxes can only be used for the construction of the bearing platform and the pier stud of a newly-built bridge, and the following problems exist:
the method comprises the steps that after a bearing platform or a pier stud is completed, because the bearing platform or the pier stud exists or partially exists, if the existing cofferdam is damaged, the bearing platform or the pier stud needs to be isolated again, and a subsequent process is completed, the existing steel suspension box cannot be installed and positioned due to the bottom;
a water-proof bridge is arranged on the steel hanging box, and the steel hanging box is arranged on the steel hanging box.
Disclosure of Invention
The invention aims to solve the technical problem that a steel hanging box device capable of being checked and maintained is installed on an existing bridge underwater bearing platform, the steel hanging box device is convenient to install, simple to hoist and easy to disassemble, and the structural rigidity and stability can meet requirements, and the steel hanging box device for checking and maintaining the existing bridge underwater bearing platform is provided.
According to the technical scheme, the steel hanging box device for checking and maintaining the underwater bearing platform of the existing bridge is provided with the rectangular structure on most of the bearing platform, so that the rectangular steel box body with the upper opening is arranged according to the shape of the bearing platform and comprises the side plates and the bottom plate. The steel hanging box device is formed by combining two long side plates, two short side plates and a bottom plate; the steel hanging box device is formed by combining two long side plates, two short side plates and a bottom plate; the middle part of the length of the long side plate is divided into two parts with the same shape and size, a bolt structure is arranged at the divided part, and the two divided side plates are connected through the bolt structure; the bottom plate is respectively connected with the long side plate and the short side plate; the middle part of the bottom plate is preset with a vacancy which comprises an area occupied between a pile foundation hole and a pile foundation hole; the bottom plate is separated from the middle part in the length direction, and the steel hanging box is divided into two parts which are connected by means of a bolt structure.
Each side of the side plate of the steel hanging box device is 0.2-0.6 m longer than the bearing platform, namely, a gap of 0.1-0.3 m is formed between each surface of the bearing platform and the opposite surface of the steel hanging box; the height of the side plate steel plate is determined according to the construction water level and the height of the bearing platform, the bottom of the side plate steel plate is 0.3-0.5 m lower than the bottom of the bearing platform, and the upper part of the side plate steel plate is 1-1.5 m higher than the construction water level.
The vacancy of the area occupied between the pile foundation hole and the pile foundation hole means that about 1/2 pile diameter width is reserved on the outer side of the short side bottom plate pile foundation and upwards tilted by about 0.3-0.5 m at an angle of 65-75 degrees; the long side edge is parallel and level to be close to the edge of the pile foundation, the edge is tilted by 75-85 degrees by about 0.3-0.5 m, 1/2 pile diameters are reserved to facilitate the fixing and positioning of the bottom of the steel hanging box, and the tilted part cannot leak out when the bottom sealing underwater concrete is poured.
The installation method of the steel hanging box device for checking and maintaining the existing bridge underwater bearing platform comprises the following steps:
(1) preparing a long side plate, a short side plate and a bottom plate of the steel hanging box according to the shape structure of the existing underwater pile foundation and a bearing platform; each side of the hanging box is 0.2-0.6 m longer than the bearing platform, namely a gap of 0.1-0.3 m is formed between the bearing platform and the steel hanging box; the height of the steel plate is determined according to the construction water level and the height of the bearing platform, the bottom of the steel plate is 0.3-0.5 m lower than the bottom of the bearing platform, and the upper part of the steel plate is 1-1.5 m higher than the construction water level;
(2) the middle parts of the two long side plates in the length direction are respectively divided into two blocks with the same left and right length, and a bolt structure is arranged at the separation part;
(3) excavating a vacancy including an area occupied between a pile foundation hole and a pile foundation hole on the bottom plate, reserving about 1/2 pile diameter width on the outer side of the short side bottom plate pile foundation, and tilting about 0.3-0.5 m upwards at an angle of 65-75 degrees; the long side edge is flush with the edge close to the pile foundation, and the edge is tilted by about 0.3-0.5 m at an angle of 75-85 degrees; the bottom plate is divided into two blocks with equal length in the length direction;
(4) respectively vertically installing, connecting and fixing the half bottom plate, the short side plate and the two half long side plates, wherein the bolt structures of the half long side plates face outwards; the left half steel hanging box and the right half steel hanging box form the steel hanging box device;
(5) during construction, a temporary fixing and hoisting system is arranged on an existing bridge pier or column, the left and right two half-width steel hanging boxes are respectively hoisted by a hoist and fixed on the hoisting system which is installed in advance, fine adjustment is carried out by tools such as a chain block and the like, when the left and right two half-width steel hanging boxes are basically in place, the left and right two half-width steel hanging boxes are connected into a whole by bolts from top to bottom at bolt reserved hole positions, and at the moment, a gap of 0.1-0.3 m is reserved between the steel hanging boxes and a bearing platform so as to pour bottom sealing underwater concrete;
(6) if the side edge of the bearing platform needs to be inspected and maintained, the gap between the steel suspension box and the bearing platform needs to be widened to 0.5-1.5 m so as to meet the operation requirement of personnel on machines and tools; the thickness of the back cover is determined according to the requirement of the inspection part of the bearing platform, and the principle is that the back cover has enough water sealing capacity and can complete the related inspection of the bearing platform; after the underwater concrete pouring is finished, water can be pumped in the steel hanging box, an inner support is arranged in the box during water pumping, and the box body is reinforced while water pumping is carried out, so that the stability and firmness of the box body are ensured;
(7) after water pumping and internal support are finished, performing necessary subsequent construction or inspection and maintenance construction on the bearing platform and the pier body;
(8) after subsequent construction or inspection and maintenance construction is completed, water can be injected into the steel hanging box, so that the water pressure inside and outside the steel hanging box is balanced, the relevant inner supports are removed while water is injected, the bolts at the two sides are pulled out upwards synchronously until the water pressure inside and outside the steel hanging box is balanced, the steel hanging box is knocked to the left side and the right side properly, the steel hanging box is separated from underwater concrete and is removed in a left-right mode, and therefore the corresponding construction process is completed, and the detached steel hanging box can be reused.
The steel hanging box device has the advantages that the steel hanging box device is designed into the left part and the right part, the long side plates of the two parts are connected by the bolt structures, the bottom plate is matched with the pile foundation below the underwater bearing platform, the problem that the existing bridge underwater bearing platform and pier stud cannot be subjected to drainage construction for a long time is solved, the steel hanging box device can be repeatedly used, and the construction cost is reduced. The invention does not change the existing construction conditions and requirements, does not change the existing construction method, only needs to divide the specially-made steel hanging box into a left hanging box and a right hanging box to be hung in place and connected into a whole by the bolt, reduces underwater construction, improves the safety of engineering, has convenient operation, less supporting equipment, is easy to accept by constructors and can be operated skillfully quickly.
The product of the invention is suitable for the condition that a newly-built bridge or an existing bridge with an underwater cushion cap or pier stud which is constructed needs to adopt a cofferdam for drainage construction, and is particularly suitable for underwater related inspection and maintenance of the existing bridge.
Drawings
FIG. 1 is a schematic view of the construction of a steel suspension box according to the present invention;
FIG. 2 is a schematic view of a conventional steel suspension box;
FIG. 3 is a schematic view of a side plate and bottom plate connection structure;
FIG. 4 is a schematic diagram of a structure of a preset vacancy of a bottom plate;
FIG. 5 is a schematic diagram of the steel suspension box in position underwater and after underwater concrete pouring.
Detailed Description
The concrete implementation mode of the steel hanging box device for the inspection and maintenance of the existing bridge underwater bearing platform is shown in figure 1.
The steel suspension box device for checking and maintaining the underwater bearing platform of the existing bridge is based on the rectangular bearing platform, is a rectangular steel box body with an upper opening, and comprises side plates and a bottom plate. The steel hanging box device is formed by combining two long side plates, two short side plates and a bottom plate; the middle part of the length of the long side plate is divided into two parts with the same shape and size, a bolt structure is arranged at the divided part, and the two divided side plates are connected through the bolt structure; the bottom plate is respectively connected with the long side plate and the short side plate; the middle part of the bottom plate is preset with a vacancy which comprises an area occupied between a pile foundation hole and a pile foundation hole; the bottom plate is separated from the middle part in the length direction, and the steel hanging box is divided into two parts which are connected by means of a bolt structure.
The bottom plate of this embodiment steel hanging box device is a rectangle steel sheet, and bottom plate middle part reservation has the breach region between four pile foundation holes and the pile foundation hole: the position of the underwater pile foundation A, B, C, D is shown in fig. 4, and the central positions of the four pile foundations are rectangular. A1A2 is the cross-sectional diameter of the A pile foundation bore, B1B2 is the cross-sectional diameter of the B pile foundation bore, C1C2 is the cross-sectional diameter of the C pile foundation bore, D1D2 is the cross-sectional diameter of the D pile foundation bore; a1, B1, B2, C2, C1, D1, D2 and A2 form a vacancy boundary of an area occupied by the pile foundation hole and the pile foundation hole in the middle of the bottom plate in advance; A2D2 and B2C2 are respectively tilting parts reserved outside the pile diameter width of the short side bottom plate pile foundation hole 1/2; A1B1 and C1D1 are respectively tilting parts reserved on the inner sides of the external tangents of the two pile foundation holes of the long-side bottom plate. The middle part of the bottom plate of the reserved gap area in the length direction is cut into two blocks, and the two blocks are symmetrical left and right.
The side panel and base panel connection is shown in figure 3. The split steel suspension box is characterized in that a short side plate is vertically installed and fixed on a bottom plate which is divided into two halves in the width direction of the bottom plate, two divided half long side plates are vertically installed and fixed on two sides in the length direction of the bottom plate, and a bolt structure is installed at one outward end of each long side plate to form a left part and a right part which can be connected into the whole steel suspension box.
In the embodiment, the steel suspension box is in place underwater, as shown in fig. 5 (a), the steel suspension box device connected by the bolt is installed on an underwater bearing platform of a bridge, a bottom plate of the steel suspension box is attached to the bottom surface of the bearing platform, and bottom sealing underwater concrete is to be poured.
The situation after the underwater concrete pouring of the steel hanging box is shown in fig. 5 (b), after the underwater concrete pouring is finished, water can be pumped in the steel hanging box, the inner support is installed in the box during water pumping, water pumping and reinforcement are carried out simultaneously, and the stability and firmness of the box body are ensured. And after the water pumping and the inner support are finished, carrying out necessary subsequent construction or carrying out inspection and maintenance construction on the bearing platform and the pier body.
After subsequent construction or inspection and maintenance construction is completed, if the steel hanging box is to be disassembled, water can be injected into the steel hanging box so as to balance the water pressure inside and outside the steel hanging box, the related inner supports are disassembled while water is injected, the bolts at the two sides are synchronously pulled out upwards until the water pressure inside and outside the steel hanging box is balanced, the steel hanging box is properly knocked to the left and right, the steel hanging box is separated from underwater concrete and is disassembled from the left and right, and therefore the corresponding construction process is completed, and the disassembled steel hanging box can be repeatedly used.
Claims (1)
1. A steel hanging box device for checking and maintaining an underwater bearing platform of an existing bridge is provided with a rectangular steel box body with an opening at the upper part according to the shape of the bearing platform, and comprises side plates and a bottom plate, and is characterized in that the steel hanging box device is formed by combining two long side plates, two short side plates and the bottom plate; the middle part of the length of the long side plate is divided into two parts with the same shape and size, a bolt structure is arranged at the divided part, and the two divided side plates are connected through the bolt structure; the bottom plate is respectively connected with the long side plate and the short side plate; the middle part of the bottom plate is preset with a vacancy which comprises an area occupied between a pile foundation hole and a pile foundation hole; the bottom plate is separated from the middle part in the length direction, and the steel hanging box is divided into two parts which are connected by a bolt structure;
each side of the side plate of the steel hanging box device is 0.2-0.6 m longer than the bearing platform, namely, a gap of 0.1-0.3 m is formed between each surface of the bearing platform and the opposite surface of the steel hanging box; the height of the side plate steel plate is determined according to the construction water level and the height of the bearing platform, the bottom of the side plate steel plate is 0.3-0.5 m lower than the bottom of the bearing platform, and the upper part of the side plate steel plate is 1-1.5 m higher than the construction water level;
the bottom plate is connected with the side plate by welding;
the installation method of the steel hanging box device comprises the following steps:
(1) preparing a long side plate, a short side plate and a bottom plate of the steel hanging box according to the shape structure of the existing underwater pile foundation and a bearing platform; each side of the hanging box is 0.2-0.6 m longer than the bearing platform, namely a gap of 0.1-0.3 m is formed between the bearing platform and the steel hanging box; the height of the steel plate is determined according to the construction water level and the height of the bearing platform, the bottom of the steel plate is 0.3-0.5 m lower than the bottom of the bearing platform, and the upper part of the steel plate is 1-1.5 m higher than the construction water level;
(2) the middle parts of the two long side plates in the length direction are respectively divided into two blocks with the same left and right length, and a bolt structure is arranged at the separated position;
(3) excavating a vacancy including an area occupied between a pile foundation hole and a pile foundation hole on a base plate, and dividing the base plate into two pieces with equal length in the length direction;
(4) respectively vertically installing, connecting and fixing the half bottom plate, the short side plate and the two half long side plates, wherein the bolt structures of the half long side plates face outwards; the left half steel hanging box and the right half steel hanging box form the steel hanging box device;
(5) during construction, a temporary fixing and hoisting system is arranged on an existing bridge pier or column, the left and right two half-width steel hanging boxes are respectively hoisted by a hoist and fixed on the hoisting system which is installed in advance, fine adjustment is carried out by a chain block tool, when the left and right two half-width steel hanging boxes are basically in place, the left and right two half-width steel hanging boxes are connected into a whole by bolts from top to bottom at bolt reserved hole positions, and at the moment, a gap of 0.1-0.3 m is reserved between the steel hanging boxes and a bearing platform so as to pour bottom sealing underwater concrete;
(6) if the side edge of the bearing platform needs to be inspected and maintained, the gap between the steel suspension box and the bearing platform needs to be widened to 0.5-1.5 m so as to meet the operation requirement of personnel on machines and tools; the thickness of the back cover is determined according to the requirement of the inspection part of the bearing platform, and the principle is that the back cover has enough water sealing capacity and can complete the related inspection of the bearing platform; after the underwater concrete pouring is finished, water can be pumped in the steel hanging box, an inner support is arranged in the box during water pumping, and the box body is reinforced while water pumping is carried out, so that the stability and firmness of the box body are ensured;
(7) after the water pumping and the internal support are finished, necessary subsequent construction or inspection and maintenance construction is carried out on the bearing platform and the pier body;
(8) after subsequent construction or inspection and maintenance construction is completed, water is injected into the steel hanging box, so that the water pressure inside and outside the steel hanging box is balanced, the related inner supports are removed while water is injected, the bolts on the two sides are pulled out upwards synchronously until the water pressure inside and outside the steel hanging box is balanced, the steel hanging box is knocked to the left side and the right side appropriately, the steel hanging box is separated from underwater concrete and is detached in left and right frames, and therefore the corresponding construction process is completed, and the detached steel hanging box can be reused.
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| CN202010730477.0A CN111827322B (en) | 2020-07-27 | 2020-07-27 | Steel hanging box device for checking and maintaining underwater bearing platform of existing bridge |
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| CN202010730477.0A CN111827322B (en) | 2020-07-27 | 2020-07-27 | Steel hanging box device for checking and maintaining underwater bearing platform of existing bridge |
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| CN111827322B true CN111827322B (en) | 2022-07-12 |
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