Combined steel pile cofferdam provided with water swellable waterproof rubber fore shaft

A water-swellable rubber and waterproof lock technology, which is applied in sheet pile walls, buildings, and foundation structure engineering, etc., can solve the problem that the draw hooks on both sides are not easy to be centered and aligned straightly, the strength and stiffness of the draw hook lock are low, and the draw hook lock Problems such as easy deformation of the mouth by force, achieve the effect of repeated reuse, simplify the construction process of the lock, and reduce the workload of on-site construction

Inactive Publication Date: 2013-01-30
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For the new-type fabricated combined steel pile cofferdam structure, if the hook-type lock of the outer welded plate band of the large-diameter steel pipe pile and the hook lock of the Larsen steel sheet pile are used to occlude and connect each other, the welded plate band during pile sinking construction The hook-shaped lock is easy to be deformed by force, and the hooks on both sides are not easy to be centered and straightly occluded. The strength and stiffness of the hook-type lock are low,

Method used

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  • Combined steel pile cofferdam provided with water swellable waterproof rubber fore shaft
  • Combined steel pile cofferdam provided with water swellable waterproof rubber fore shaft
  • Combined steel pile cofferdam provided with water swellable waterproof rubber fore shaft

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Effect test

Embodiment 1

[0034] The combined steel pile cofferdam with water-swellable rubber waterproof lock of the present invention consists of steel pipe piles, U-shaped steel sheet piles, Ω-shaped steel lock female parts, Ω-shaped water-swellable rubber tubes, and locks. It consists of round steel rods, bentonite mixture filler, channel steel connectors and H-shaped steel piles. Steel pipe piles are used as long piles in the cofferdam structure, U-shaped steel sheet piles are used as short piles in the cofferdam structure, and Ω-shaped steel locks The Ω hole-shaped water-expandable rubber tube is embedded in the mouth parent part as the waterproof lock body part, the round steel rod of the lock part is inserted into the Ω-hole-shaped water-expandable rubber tube, and the Ω-hole-shaped water-expandable rubber tube and the lock part The cavities between the steel rods are filled and compacted with bentonite mixture filler.

[0035] The locking mother part is composed of a hot-rolled steel bar and a...

Embodiment 2

[0041] The construction method of the combined steel pile cofferdam with water-swellable rubber waterproof lock of the present invention comprises the following steps:

[0042] Step 1: Determine the plane size of the waterproof cofferdam according to the range of hydraulic structures or bridge piers, clean up the riverbed, avoid encountering obstacles at the position where the steel piles are inserted, take precise stakeout measurements, and install guide frames;

[0043] Step 2: At the construction site, the steel pipe piles are blanked, and the channel steel connectors are welded on the outside of the steel pipe piles. Then, the Ω hole-shaped steel lock female part and the strip embedded with the Ω hole-shaped water-swellable rubber tube The finished product is welded on the outside of the channel steel connector to form a long pile of waterproof cofferdam, and the long pile is driven into the design depth;

[0044] The weight ratio of step 3 preparation is: bentonite conten...

Embodiment 3

[0047] A cofferdam is rectangular in shape, 15 meters long and 10 meters wide, the water depth of the cofferdam is 10 meters, and the underwater excavation depth of the pier foundation is 5 meters. Steel pipe piles with a diameter of 800mm and a wall thickness of 16mm are selected as the long piles of the cofferdam, and the length of the steel pipe piles is designed to be 30 meters. Cold-formed U-shaped steel sheet piles with a width of 1200mm, a height of 300mm, and a wall thickness of 14mm are selected as the short piles of the cofferdam. The length of the U-shaped steel sheet piles is designed to be 24 meters. H350*250*10*14 shaped steel supports are used to reinforce U-shaped steel sheet piles, and the length of H-shaped steel piles is designed to be 26 meters. The hot-rolled forming process is used to produce the Ω-shaped steel lock female part. The shape of the lock female part is square on the outside and circle on the inside. The outer surface is a square with a width ...

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Abstract

The invention discloses a combined steel pile cofferdam provided with a water swellable waterproof rubber fore shaft, which comprises cofferdam pegs and cofferdam long piles used for connecting two adjacent cofferdam pegs. Each cofferdam peg comprises a U-shaped steel sheet pile and a fore shaft sub-part, and the left and right ends of each U-shaped steel sheet pile are respectively and fixedly connected with one fore shaft sub-part. Each cofferdam long pile comprises a steel pipe pile, a fore shaft parent part arranged at the outer side of the steel pipe pile, and a water swellable rubber liner arranged in the fore shaft parent part; a tubular inner cylinder matched with each fore shaft sub-part and a notch connecting the interior of each tubular inner cylinder with the exterior of each tubular inner cylinder are arranged on the fore shaft parent part; each water swellable rubber liner is fixedly arranged on the inner wall of the corresponding tubular inner cylinder; each fore shaft sub-part is sleeved into the corresponding tubular inner cylinder; and bentonite compound filler is filled in a gap between each fore shaft sub-part and each water swellable rubber liner. By taking the combination of a rigid steel pile and a flexible steel pile to have complementary advantages, the combined steel pile cofferdam has good water resistance; the fore shaft is reliable in connection; the material of the combined steel pile cofferdam is easy to obtain; and the combined steel pile cofferdam is strong in integral structural rigidity and low in cost and is quick to construct.

Description

technical field [0001] The invention belongs to the field of deep water foundation construction, and relates to a cofferdam structure of civil engineering, in particular to a combined steel pile cofferdam. Background technique [0002] The cofferdam structure is a temporary structure in the construction of bridge foundations and hydraulic structures, and its function is to retain soil and water. When the water depth is shallow, soil bag cofferdams and wooden sheet pile cofferdams are generally used; in rivers with deep water and high flow velocity, steel sheet pile cofferdams, steel pipe pile cofferdams, and steel box cofferdams are generally used. [0003] Steel sheet pile cofferdam is the most commonly used form of cofferdam. Larsen steel sheet pile is a type of steel with hook lock. Steel sheet pile has the characteristics of light weight, convenient construction, reusability, and low cost. It has been widely used in construction. Domestically produced cold-formed Larse...

Claims

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Application Information

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IPC IPC(8): E02D19/04E02D5/08C04B28/26
Inventor 徐文平陈有春杨海荣沈旭鸿计翔苏刘石先旺
Owner SOUTHEAST UNIV
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