Bridge waterside foundation pit excavation and support method and support wall structure

Abstract

The invention discloses a bridge waterside foundation pit excavation and support method and a support wall structure. At least two rows of pile walls are horizontally gate-shaped, and earth is filled between one row of pile walls and the other row of pile walls. When the supporting of bridge waterside foundation pit is carried out by adopting the bridge waterside foundation pit excavation and support method, the original structural form of overlapping to form a grid-like structure or connecting to form an entity is changed into the structural form of overlapping the cement mixing piles along the straight line direction to form pile walls, wherein a certain space is left between two or multiple rows of pile walls, so that the earth surrounded by the pile walls can resist the outside water and earth pressure. Compared with the way of resisting the water and earth pressure by only depending on the thickened cement-earth wall, the use amount of cement and the shift of equipment are saved effectively. In addition, because a space is left among the pile walls, the disturbance of the post-constructed pile walls to the constructed pile wall earth structure, and the overall impermeability resisting capacity of the gravitational cement-earth wall can be improved. Therefore, when the supporting of the excavation of bridge waterside foundation pit is carried out by adopting the bridge waterside foundation pit excavation and support method, the construction cost of the gravitational wall can be reduced, and the supporting intensity of the excavation of foundation pit can be improved.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to a method for excavating and supporting foundation pits near water of bridges and a supporting wall structure. Background technique [0002] When bridges cross rivers, ponds and other waters, there are often piers on the shore close to the water. During the construction of bored pile foundations for these bridge piers, soil platforms are often filled at the waterside as drilling rig platforms, while pile foundation construction When carrying out the construction of caps after completion, it is usually necessary to set up various forms of cofferdams first. The choice of cofferdam form is related to the depth of excavation and the amount of water seepage: when the excavation depth is about 5-6 meters, the water seepage is large, or the water level outside the pit is high, steel sheet piles or locked steel pipes are usually used Pile cofferdam for support. Since the commonly used...

AI Technical Summary

Problems solved by technology

However, the use of steel sheet piles or steel pipe pile cofferdams has the following problems: First, to reduce the difficulty of excavating earthwork in the cofferdam, steel sheet pile or steel pipe pile cofferdams are usually set in a "gate" shape, that is, near the water bank and two sides, but no or less steel sheet piles or steel pipe piles are installed on the opposite side of the bank to facilitate the entry and exit of earth-borrowing machinery. In this case, it becomes very inconvenient to set closed rigid supports; other Second, the cost of piling, pulling out piles and fences of the steel sheet pile cofferdam is very high, and because the locked steel pipe pile is not a stereotyped product, the cost is even higher

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