No-trestle water bridge pile foundation and bearing platform construction method and cofferdam thereof

Abstract

The invention discloses a no-trestle water bridge pile foundation and bearing platform construction method and a cofferdam thereof, and belongs to the field of construction of water bridges. The cofferdam comprises a locking port steel pipe pile and a cofferdam surrounded by purlins thereof; no diagonal brace is arranged in the cofferdam; an opening structure is arranged on one side, near a bank, of the cofferdam, and includes an opening formed in the side, near the blank of the cofferdam, and a section of aisle arranged in the opening and communicated with the opening; the aisle consists of a locking port steel pipe pile and purlins thereof; and a construction road extending from a shore levee extends to reach the opening of the cofferdam via the aisle. The construction method comprises the following steps: steel plate piles are beaten in place; a mud surface in the cofferdam is leveled; steel protection cylinders are beaten to finish construction of drilling piles; soil in the cofferdam is dig to a designed mud surface elevation, and pile heads are drilled out; bottom sealing concrete is cast according to a designed thickness; after the bottom sealing concrete reaches the strength, a bearing platform is cast; and after the bearing platform reaches the strength, the cofferdam is dismounted. The method can largely save the construction cost and improve the construction efficiency.

Description

technical field [0001] The invention belongs to the field of bridge construction over water, and is suitable for cast-in-situ construction of bridge pile foundations and caps where the main pier is located on a bank with good geological conditions, and there are dry seasons and Fengshui periods, especially in dry seasons where the water level is within 5m above the mud surface . Background technique [0002] 1) Equipment (or temporary structures) used in traditional crafts: [0003] At present, the pile foundation under the bridge cap in the water area is constructed using a drilled platform. The steel casing is used as a device to stabilize the hole wall, prevent the hole from collapsing, isolate the surface water, guide the drill bit and fix the pile position. Drilling, sinking of steel cages, and pouring of concrete; while the construction of caps is generally realized by steel sheet pile cofferdam, earth-rock cofferdam, steel hanging box, steel sleeve box and other stru...

AI Technical Summary

Problems solved by technology

The construction of conventional bridge caps needs to set up water-retaining and water-proof structures, such as steel sheet piles, earth-rock cofferdams, steel hanging boxes or steel sleeve boxes, and these structures are all closed around, and the construction in variable water is land construction. Because in the water, it is necessary to build trestles and supporting trestles from the shore to the bearing platform to form a whole with the drilling platform to ensure that the drilling rig and other construction equipment can be in place and constructed on the drilling platform, which requires a lot of steel and labor. cost, after the pile foundation construction is completed and before the construction of the cap, it is necessary to dismantle the previously built trestle and drilling platform. The erection and dismantling of this kind of trestle and support trestle will increase the construction cost, affect the construction efficiency and prolong the construction period

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