CN105274985A - Steel pipe pile internally provided with multiple arc-shaped stiffening ribs and construction method of steel pipe pile - Google Patents

Abstract

The invention discloses a steel pipe pile internally provided with multiple arc-shaped stiffening ribs. The steel pipe pile is composed of a steel pipe and the stiffening ribs. The stiffening ribs are evenly arranged on the inner side wall of the steel pipe. The two sides of the stiffening ribs are welded to the inner side wall of the steel pipe through fillet welds in the vertical direction. A pouring region is formed between each stiffening rib and the inner side wall of the steel pipe. The stiffening ribs are arranged overall or partially. The multiple arc-shaped stiffening ribs are arranged. The construction method of the steel pipe pile includes four steps. The steel pipe pile is more scientific in design, reasonable in structure, excellent in stress performance, safe, reliable, beneficial to design manufacturing, low in weight, less in steel consumption, low in transport and construction cost, more convenient and practical.

Description

A steel pipe pile with multiple arc-shaped stiffeners and its construction method

technical field

The invention relates to a steel pipe pile and a construction method thereof, in particular to a steel pipe pile with a plurality of arc-shaped stiffening ribs inside and a construction method thereof.

Background technique

With the development of the national economy and the advancement of science and technology, the development of energy is advancing from land to sea, including offshore oil and offshore wind power. The current marine engineering foundation forms include gravity foundation, single pile foundation, multi-pod foundation, jacket foundation, high pile cap foundation, floating foundation and suction cylinder foundation. Pile foundation has obvious advantages in design, manufacture and construction. Taking offshore wind farms as an example, under most water depth and wind turbine load conditions, steel pipe pile monopile foundation is the preferred foundation form.

With the increase of sea water depth and the increase of the single unit capacity of the fan unit, the diameter of the single pile foundation steel pipe is also increasing. With the increase of the pile diameter, the wall thickness of the steel pipe pile also increases according to the specifications, and the single pile foundation of the offshore steel pipe pile is mostly an open pile. The plug effect is weak, the lateral frictional resistance provided by the soil inside the pile is much worse, and the bearing capacity of the pile tip is very low, and sufficient pile length is needed to ensure the vertical bearing capacity of a single pile. All the above factors lead to a significant increase in steel consumption , The cost of materials increases, the difficulty of processing increases, and other costs such as transportation and construction caused by the self-weight of the structure also increase accordingly, which affects the economics of the project. Therefore, there is a need for a ribbed steel pipe pile and a construction method thereof that are safe, reliable, conducive to design and manufacture, reduce dead weight, and reduce costs such as materials and transportation and construction.

Contents of the invention

In order to solve the shortcomings in the above problems, the present invention provides a steel pipe pile with a plurality of arc-shaped stiffeners inside and a construction method thereof.

In order to solve the above technical problems, the technical solution adopted by the present invention is: a steel pipe pile with multiple arc-shaped stiffeners inside, which is composed of steel pipes and stiffeners; the stiffeners are evenly arranged on the inner wall of the steel pipe; The two sides of the rib are vertically welded on the inner wall of the steel pipe with fillet welds; a pouring area is formed between the stiffener and the inner wall of the steel pipe.

The setting method of the stiffener is general setting or partial setting. The number of stiffeners is multiple, and the shape is arc-shaped.

The steps of its construction method are:

a. In the steel structure processing plant, the steel pipe is rolled into shape and welded in sections to form a whole;

b. The stiffener 2 is vertically welded to the inner wall of the steel pipe with a fillet weld;

c. Transport the assembled whole pile to the pile site by a special transport ship, use corresponding equipment to carry out piling construction and drive the pile body to the design elevation, and then carry out anti-scouring treatment of riprap;

d. According to the design requirements, pour concrete in the pouring area formed between the stiffener and the inner wall of the steel pipe, and carry out other subsequent construction and installation after it reaches the design strength.

The invention is more scientific in design, reasonable in structure, superior in mechanical performance, safe and reliable, conducive to design and manufacture, light in weight, less in steel materials, low in transportation and construction costs, and more convenient and practical.

Description of drawings

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a schematic cross-sectional view of the present invention (without pouring concrete).

Fig. 2 is a schematic cross-sectional view of the present invention (poured concrete).

Fig. 3 is a perspective view of Fig. 1 (without pouring concrete).

Fig. 4 is a perspective view of Fig. 2 (poured concrete).

detailed description

As shown in Figures 1-4, the present invention consists of a steel pipe 1 and stiffeners 2; the stiffeners 2 are evenly arranged on the inner side wall of the steel pipe 1, and the stiffeners 2 are arranged in a full-length or partial arrangement. The number of stiffeners 2 is 4 or more, and the shape of the stiffeners 2 is arc or other curved forms.

Both sides of the stiffener 2 are vertically welded on the inner wall 1 of the steel pipe 1 by fillet welds 3 or other methods; a pouring area is formed between the stiffener 2 and the inner wall of the steel pipe 1; the pouring area can be poured or not Pouring concrete 4.

Construction method of the present invention is:

a. The steel pipe 1 is rolled into shape in a steel structure processing plant and welded in sections to form a whole;

b. The stiffener 2 is vertically welded on the inner wall of the steel pipe 1 by fillet weld 3 or other methods, and other auxiliary structures can also be assembled in the factory in advance;

c. Transport the assembled whole pile to the pile site by a special transport ship, use corresponding equipment to carry out piling construction and drive the pile body to the design elevation, and then carry out anti-scouring treatment of riprap;

d. According to design requirements, pour concrete 4 into the pouring area formed between the stiffener 2 and the inner wall of the steel pipe 1, and perform other subsequent construction and installation after it reaches the design strength.

Adding multiple arc-shaped stiffeners to large-diameter steel pipe piles can reduce the wall thickness of the steel pipes and the total amount of steel used. The small area formed by the arc ribs will form a complete soil plug during pile driving, which can increase the bearing capacity of the pile end. According to the design requirements Concrete can be poured into the interval between the arc-shaped ribs behind the soil plug and the outer wall of the steel pipe, which can increase the rigidity of the pile body, reduce the corrosion area of the pile body, and improve the durability of the structure. Improve the internal frictional resistance of the pile and the bearing capacity of the pile tip. Concrete can be poured into the section formed by the arc-shaped rib and the steel pipe pile wall, which can significantly increase the stiffness of the pile body. Under the same design requirements, the pile length will be effectively reduced, and the The cost of materials, transportation, construction, etc., has good economy. In addition, when concrete is poured into the compartment formed by the arc-shaped rib and the steel pipe pile wall, the corrosion area of the pile body can be reduced, and the durability of the structure can be improved.

The above-mentioned embodiments are not limitations to the present invention, and the present invention is not limited to the above-mentioned examples. Changes, modifications, additions or substitutions made by those skilled in the art within the scope of the technical solution of the present invention also belong to this invention. protection scope of the invention.

Claims (4)

1. A steel pipe pile with multiple arc-shaped stiffeners inside, characterized in that it is composed of steel pipes (1) and stiffeners (2); the stiffeners (2) are evenly arranged on the inner side of the steel pipe (1) on the wall; both sides of the stiffener (2) are vertically welded to the inner wall (1) of the steel pipe (1) by fillet welds (3); between the stiffener (2) and the inner wall of the steel pipe (1) Create a perfusion zone. 2. The steel pipe pile with a plurality of arc-shaped stiffeners inside according to claim 1, characterized in that: The arrangement of the stiffeners (2) is full-length or partial. 3. The steel pipe pile provided with a plurality of arc-shaped stiffeners according to claim 1 or 2, characterized in that: the number of the stiffeners (2) is multiple and the shape is arc-shaped. 4. The steel pipe pile with a plurality of arc-shaped stiffeners inside according to claim 1-3, characterized in that: the steps of its construction method are: a. In the steel structure processing plant, the steel pipe (1) is rolled into shape and welded in sections to form a whole; b. The stiffener (2) is vertically welded to the inner side wall of the steel pipe (1) with a fillet weld (3); c. Transport the assembled whole pile to the pile site by a special transport ship, use corresponding equipment to carry out piling construction and drive the pile body to the design elevation, and then carry out anti-scouring treatment of riprap; d. According to design requirements, pour concrete (4) into the pouring area formed between the stiffener (2) and the inner wall of the steel pipe (1), and carry out other subsequent construction and installation after it reaches the design strength.