CN101173499A - Method and device for underwater construction of bridge piers - Google Patents

Abstract

The purpose of the present invention is to solve the problem that the bridge pier can continue to be constructed after being submerged in water. It uses a steel sleeve box in the construction of the bridge foundation, inserts it into the pier body for a certain length, and uses the suspended beam set It is positioned and suspended on the underwater pier to form a closed waterless space to provide underwater pier construction operations. Compared with the prior art, the bridge pier construction steel box of the present invention has thin cofferdams, no formwork, light weight, easy splicing, easy dismantling, small surrounding water area, convenient hoisting, assembly and disassembly on site, and low construction difficulty. It can effectively reduce the amount of filling, greatly reduce the amount of construction, save costs, and is easy to dismantle and clean.

Description

Method and device for underwater construction of bridge piers

technical field

The invention relates to a bridge erection engineering method, in particular to a bridge pier underwater construction method and an auxiliary device.

Background technique

With the rapid development of my country's national economy, the construction of roads and railways has also developed rapidly. Therefore, bridge erection has become a key project in transportation construction, especially in the construction of small and medium river bridges. Our country has a long history of bridge construction. A number of famous bridges such as "Zhaozhou Bridge" are shining in the splendid culture of the Chinese nation for 5,000 years. At present, our country has been able to skillfully build long, long-span, deep-water foundation bridges. However, this The inventor believes that in the current construction of bridge piers in China, especially in the construction of deep-water rapids, there are certain problems, because most of the construction of bridge piers is carried out above the water surface, and the water level of some rivers varies more with seasonal changes. Large, or other reasons cause water level changes (such as: downstream dam water storage), which will cause the bridge piers under construction to be submerged, which will stop the construction of the bridge piers, and only wait for the water level to recede before the bridge piers can be constructed. Due to special circumstances, the water level cannot be receded, and the construction of bridges can only be abandoned or rebuilt, resulting in huge investment losses. In this way, people have invented the construction method of pier cofferdam, in which the steel box is a kind of surrounding water structure used in the underwater foundation construction of bridges, and it provides a water-free working space for the underwater foundation construction. The top of the pile or the steel casing of the foundation pile, the working platform is the support, and the casing is suspended in the water. It is composed of the inner plate, the bottom plate and the suspension system. The construction method is to first use the steel sleeve to surround the working face of the pier column construction , pouring concrete at the bottom of the casing to seal, after the concrete reaches a certain strength, pump water, carry out the reinforcement binding of the entire tie beam and pier column, install the formwork, and finally pour concrete to complete the construction of the tie beam and pier column in the water. This construction method The bottom steel casing is required to be large enough to completely surround the two foundation columns of the double-column pier, and to have sufficient rigidity and strength. Therefore, the weight of the casing is large, the one-time investment is large, and the construction is difficult. Moreover, the bottom plate Concrete cannot be removed, which increases the difficulty of subsequent construction. Therefore, someone has invented a patent for bridge pier construction, such as: a new method for deep-water channel construction pier cofferdam construction (application number is 200510048420). Build the outer frame (2) at the designed pier in the river, place the outer formwork (1) on the outer frame (2) close to the steel pipe surface, build the inner frame (5), and place the inner frame (5) close to the steel pipe surface Layer formwork (4), then fill soil (3) between the outer formwork (1) and the inner formwork (4), pump out the accumulated water in the cofferdam (6), and then the pier can be built in the cofferdam (6). construction. But because the cofferdams used above are double-layered, with ribbed plates inside, the cofferdam structure is huge, it is difficult to make, waste wood, the cost is high, and the workload of on-site hoisting, assembling and dismantling is large. Therefore, people are looking for a cofferdam. An economical and practical construction method for pier cofferdams that is easy to splice, easy to dismantle, small in enclosure area, light in weight, low in construction difficulty.

Contents of the invention

The purpose of the present invention is to solve the problem that the submerged pier can continue to be constructed upwards, and to improve the method and device for underwater construction of the pier used in bridge foundation construction.

The method that realizes the present invention is like this:

First, build a floating platform on the water surface at the pier construction site, process the steel box on the shore, process the bottom plate of the steel box on the platform, and then assemble the first section of steel box on the bottom plate of the bottom steel box, and use it on the platform after the assembly is completed. The crane lifts the entire section of the steel box, puts it into the water, and then assembles the next section of the steel box on top of the steel box, then pours concrete or water into the cavity of the steel box to make it sink, and repeats the assembly of the steel box The beam and the inner support of the steel box are submerged until the beam of the suspended steel box reaches a certain position from the top surface of the pier body, and then the plane position of the steel box is adjusted, and the pier under the position of the suspended steel box beam is launched by the diver The body is leveled with steel plates, and then water pressure is poured into the cavity of the steel sleeve box, so that the steel sleeve box is placed on the top of the pier body. After the steel sleeve box is positioned on the pier body, the core concrete in the pier body cavity and the bottom of the steel sleeve box are sealed. For the underwater concrete pouring of concrete, after the concrete strength meets the design requirements, the water in the steel casing box is drained to form a closed water-free space, and the pier body construction can be carried out in the steel casing box. After the pier body construction is out of the water, Cutting and dismantling part of the steel box under water can complete the underwater construction of the bridge pier.

The device that realizes the method for underwater construction of bridge pier of the present invention is to be made of steel casing, steel casing bottom plate and steel casing inner support, suspension steel casing crossbeam, and steel casing is slightly larger than the pier body size of bridge pier, during construction The bottom plate of the steel casing covers the pier body of the underwater pier, one end of the steel casing supports the pier body of the bridge pier, and the other end supports the inner wall of the steel casing, and the hanging steel casing beam is arranged on the upper part of the steel casing.

The above-mentioned steel box is characterized in that the steel box is a double-walled airtight structure, which can float in water, and is assembled in sections, poured into the steel box cavity and sunk by concrete weight.

Compared with the prior art, the bridge pier construction method of the present invention has the following advantages:

1. Solve the problem that the pier can continue to be constructed after being submerged in water, and improve the underwater construction method of the pier used in the construction of the bridge foundation.

2. The cofferdam is thin, does not need templates, is light in weight, easy to splice and dismantle, has a small surrounding water area, is convenient to hoist, assemble and disassemble on site, and is less difficult to construct. It can effectively reduce the amount of filling, greatly reducing the construction volume and construction period Short, cost-saving, easy to dismantle and clean up, so it has broad market prospects.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is a working principle diagram of the implementation of the present invention.

FIG. 2 is a plan view of FIG. 1 .

Part numbers in the figure: pier body 1, steel box 2, steel box bottom plate 3, steel box cavity filled with concrete 4, steel box bottom sealing concrete 5, pier body inner cavity core-filled concrete 6, steel box inner support 7 , Suspension steel box beam 8.

Detailed ways

As shown in Figure 1, the device of the method for bridge pier underwater construction of the present invention is made of steel box 2, steel box bottom plate 3 and steel box inner support 7, suspension steel box beam 8, steel box cavity during construction Filled with concrete 4. The steel box 2 is slightly larger than the pier body 1. The steel box 2 is put on the pier body 1. There is a steel box bottom-sealing concrete 5 between the steel box bottom plate 3 and the pier body 1. There is a steel sleeve on the pier body 1. The box supports 7, and the upper part is provided with a suspension steel sheath crossbeam 8.

The implementation method of bridge pier underwater construction of the present invention is described in detail as follows:

Process the steel casing 2 in sections and blocks in the factory or on the shore, build a floating platform on the water surface at the pier construction site, first process the bottom plate 3 of the steel casing on the platform, and then assemble the first on the bottom plate 3 of the bottom steel casing Steel-section box, after the assembly is completed, use the gantry crane on the platform to lift the whole section of steel box 2, remove the bracket under the bottom plate 3 of the steel box, put the whole section of steel box into the water, and then assemble on it In the next section, the steel box 2, pour concrete 4 into the steel box cavity or water to make it sink, and repeat its assembly (including the installation of the hanging steel box beam 8 and the steel box inner support 7 ), the sinking process until the suspension steel box beam 8 reaches the position about 5cm away from the top surface of the pier body, and then adjust the plane position of the steel box 2, and the diving workers will launch the suspension steel box beam 8 on the pier body Pad it flat with a steel plate, and then fill the cavity of the steel casing 2 with heavy water pressure, so that the steel casing 2 is placed on the top of the pier body 1. After the steel casing 2 is positioned on the pier body, the core concrete 6 and the pier body cavity are filled. For the underwater concrete pouring of the bottom-sealing concrete 5 of the steel casing box, after the concrete strength meets the design requirements, the water in the steel casing box is drained, and the pier body construction can be carried out on the steel casing box 2. After the pier body is constructed out of the water, the Underwater cutting and dismantling part of the steel box 2.

Claims (3)

1. A method for underwater construction of a bridge pier, characterized in that: first a floating platform is built on the water surface at the pier construction place, the steel casing is processed on the bank, the steel casing bottom plate is processed on the platform, and then the bottom steel casing is Assemble the first section of steel box on the bottom plate. After the assembly is completed, use the crane on the platform to lift the whole section of steel box, put the whole section of steel box into the water, and then assemble the next section of steel box on top of the steel box. Then pour concrete or water into the cavity of the steel casing to make it sink, repeat the assembly of the steel casing beam and the inner support of the steel casing, and sink until the hanging steel casing beam reaches a certain position from the top surface of the pier, and then Adjust the plane position of the steel box, and let the divers go into the water to level the pier under the beam of the suspended steel box with steel plates, and then pour water into the cavity of the steel box to make the steel box rest on the top of the pier After the steel casing box is positioned on the pier body, the underwater concrete pouring of the core-filling concrete in the pier body cavity and the bottom-sealing concrete of the steel casing box is carried out. After the concrete strength meets the design requirements, the water in the steel casing box is drained to form an airtight In the anhydrous space, the pier body construction can be carried out in the steel sleeve box. After the pier body construction is out of the water, part of the steel sleeve box can be cut and removed underwater to complete the underwater construction of the bridge pier. 2. the device that the method for underwater construction of bridge piers as claimed in claim 1 adopts, is characterized in that: this device is to be made of steel box, steel box bottom plate, steel box inner support and suspension steel box beam , the size of the steel casing is slightly larger than the pier body of the pier. During construction, the bottom plate of the steel casing covers the pier body of the underwater pier. One end of the steel casing supports the pier body of the bridge pier, and the other end supports the inner wall of the steel casing. The steel sheath beam is arranged on the upper part of the steel sheath box. 3. The device adopted in the method for underwater construction of bridge pier according to claim 1, characterized in that: the steel casing is a double-walled closed structure, capable of self-floating in water, and adopts a segmented and assembled structure.

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