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CN-224227835-U - Deep water foundation

CN224227835UCN 224227835 UCN224227835 UCN 224227835UCN-224227835-U

Abstract

The deep water foundation is designed into a rectangular buoyancy tank, and the section of the buoyancy tank is designed into a honeycomb shape so as to resist the pressure of water. The bottom plate of the honeycomb is provided with preformed holes so that piles can smoothly pass through, and the buoyancy tank is fixed on the sea floor through the piles. During construction, the foundation can be constructed on the water surface by utilizing the buoyancy of water, so that the influence of water pressure is avoided. When the pile is used, the buoyancy of water to the buoyancy tank is utilized to bear the weight of all bridges, and the pile bears the weight of a running vehicle. By the method, the pier foundation can be built in the water area with the depth of more than 100 meters, and the construction difficulty of the deepwater foundation is solved.

Inventors

  • GENG YONGTIAN

Assignees

  • 耿永田

Dates

Publication Date
20260512
Application Date
20250319

Claims (3)

  1. 1. A deep water foundation is characterized in that the foundation (1) is designed into a rectangular reinforced concrete box body, the cross section of the foundation is designed into a honeycomb shape, the box body is composed of a bottom plate (8) and honeycomb walls, reserved holes (7) are formed in the bottom plate (8), 4 hydraulic supporting legs (3) are arranged at four corners of the bottom of the foundation (1), the foundation (1) is fixed on the sea floor through piles (4), the thickness and the distance of the honeycomb walls are determined according to the depth of sea water, the number of the honeycombs is determined according to the weight of a bridge, and the number of the piles (4) is determined according to the weight of a running vehicle.
  2. 2. The foundation (1) according to claim 1, characterized in that the hydraulic leg (3) consists of a bracket (15), a hydraulic jack (16), a support bar (17), a pipe clamp (18), a base (20).
  3. 3. The foundation (1) according to claim 1, wherein the pile (4) consists of a prefabricated sleeve (25), a prefabricated pile tip and post-cast reinforced concrete (31), the sleeve (25) consists of the prefabricated reinforced concrete (10) and a steel cylinder (13), the steel cylinder (13) is arranged outside, the upper end and the lower end of the steel cylinder (13) are provided with inner flanges (11) and reinforcing plates (14), screw holes (12) are formed in the upper surface of the inner flanges (11), and the sleeve (25) is connected with the sleeve (25) through bolts.

Description

Deep water foundation Technical Field The invention relates to a pier foundation for deep sea, which is used for constructing the foundation in a deep water area exceeding 100 meters by utilizing the buoyancy of water and avoiding the influence of the boiled water. Background The full length of the bridge of the harbor Zhuhai and Macao is 55 km, wherein the main bridge is 29.6 km, and the maximum water depth is 44 meters. Because the construction difficulty of the deep water foundation is very high, a bridge tunneling mode is adopted to build a cross-sea bridge, two artificial islands are needed to be built in the sea, and a tunnel is arranged between the two artificial islands, so that the bridge building period is long for nearly 9 years, the construction cost is particularly high, and the cost is 1269 hundred million RMB. Jongzhou strait 19.4 km at the narrowest, 114 m at maximum water depth and 44 m at average water depth. According to the design scheme, the highway-railway dual-purpose sea-crossing bridge is constructed by using the existing construction technology, the construction difficulty of the highway-railway dual-purpose sea-crossing bridge is far more than that of a bridge of a port Zhuhai and Macao, and the budget cost is more than 1400 hundred million RMB, and the highway-railway dual-purpose sea-crossing bridge can be constructed by using the existing construction technology. In addition, there are some unpredictable factors, so the Jongzhou strait bridge is not operated until now because of the great difficulty of foundation construction, high cost and the like. The key point of bridge construction is that the foundation can be built in deep water. Deep water foundation construction is a difficult problem because water has pressure, and the deeper the water is, the greater the pressure is, and the foundation construction difficulty increases with the increase of the water depth, so that the foundation cannot be constructed. The bridge of port Zhuhai and Macao has the maximum water depth of 44 meters, the bridge pier foundation cannot be constructed, but the bridge pier foundation has the maximum water depth of 114 meters, and is less likely to be constructed, so that the bridge cannot be constructed in the Jongzhou strait by the traditional construction method. In another idea, the water has another characteristic, namely buoyancy. If the pressure of water can be avoided, the buoyancy of the water is fully utilized, the difficulty and the cost of deep water foundation construction can be greatly reduced, and the difficulty of deep water foundation construction is solved. Disclosure of Invention The foundation is designed into a buoyancy tank, and the buoyancy tank is fixed on the sea floor through piles. The buoyancy of the buoyancy tank is utilized to bear the weight of the pier foundation and all the weights at the upper part, namely all the weights are constant. The weight of the driving vehicle, i.e. the live load, is carried by the pile. The foundation can be constructed on the water surface, avoids the influence of boiled water, and is constructed by adopting a conventional method. Only the pile is constructed underwater, so that the construction difficulty is very small and the construction is easy to achieve. The foundation is designed into a rectangular reinforced concrete box body, the section of the rectangular reinforced concrete box body is designed into a honeycomb shape, the pressure of seawater is resisted by the honeycomb wall, and the box body consists of a bottom plate and the honeycomb wall. The preformed hole is arranged on the bottom plate so that the pile can smoothly pass through the bottom plate, and the pre-buried steel pipe is arranged above the preformed hole. Four corners of the bottom of the foundation are provided with 4 hydraulic supporting legs, and the foundation is fixed on the sea bottom through piles. The thickness and spacing of the honeycomb walls are determined based on the depth of the seawater. According to the weight of the bridge, the number of the honeycombs is determined so as to adjust the buoyancy of the foundation in water. The number of piles is determined according to the weight of the driving vehicle. The hydraulic support leg consists of a bracket, a hydraulic jack, a supporting rod, a pipe clamping device, a sealing device and a base, and the design bearing capacity of the hydraulic support leg is more than 1000 tons. The diameter of the pile is 3m, and the design bearing capacity is more than 1000 tons. The pile consists of prefabricated sleeve, prefabricated pile tip and post-cast reinforced concrete. The sleeve consists of prefabricated reinforced concrete and a steel cylinder, wherein the steel cylinder is arranged in the sleeve, and the prefabricated reinforced concrete is arranged outside the sleeve. The sleeve length was 3m and the wall thickness was 150mm. The upper and lower ends of the steel cylinder are provided with an inner