CN215252985U

CN215252985U - Prestressed hollow sandwich concrete-filled steel tube lattice type mixed jacket

Info

Publication number: CN215252985U
Application number: CN202022549208.2U
Authority: CN
Inventors: 王宇航; 仇逍逸; 周绪红; 王滨; 高山
Original assignee: Chongqing University
Current assignee: Chongqing University
Priority date: 2020-11-06
Filing date: 2020-11-06
Publication date: 2021-12-21
Anticipated expiration: 2030-11-06

Abstract

The utility model discloses a mixed jacket of prestressing force cavity intermediate layer steel pipe concrete lattice formula. The device consists of a fan, a steel tower cylinder, a switching device, a lattice type jacket and steel piles. The corner columns of the lattice type jacket are connected with the steel piles by flanges; the adapter device is arranged on the top of the conduit frame; the steel tower cylinder is connected with the upper part of the adapter device through a flange; the fan is arranged on the steel tower drum; the lattice type conduit frame can be triangular or quadrangular, and the corner columns are made of prestressed hollow sandwich steel pipe concrete; the inclined rods in the lattice type jacket adopt common steel pipes, and concrete is poured into the crossed nodes. The main components of the lattice type jacket adopt hollow sandwich steel pipe concrete and common steel pipes, the using amount of steel and concrete is reduced, full-length continuous prestress is applied to the main supporting rod pieces, the tensile property of the structure can be improved, the concrete is prevented from cracking, and the lattice type jacket is a brand-new offshore wind power jacket form.

Description

Prestressed hollow sandwich concrete-filled steel tube lattice type mixed jacket

Technical Field

The utility model relates to an offshore wind power generation technical field.

Background

Wind power has recently attracted attention worldwide as a clean energy source. Compared with common wind power, the offshore wind power generation system has the remarkable advantages of larger wind speed, more stable operation and longer available time, and the offshore wind power plant is close to large and medium-sized cities with dense population and huge power consumption demand, so that the offshore wind power generation system becomes the blue sea of the wind power industry and has huge potential.

The jacket type fan foundation is a foundation form which is used more in the current offshore wind power structure, and is suitable for the fields of large fans and deep sea. The foundation of the offshore wind power structure bears hydrodynamic load during operation, the fan can also bear the long-term action of the aerodynamic load, and the frequent alternating stress in the structure can possibly cause the fatigue failure of the node. The traditional jacket mostly adopts a lattice type steel pipe jacket, has high requirements on positioning and leveling precision and is difficult to level. The on-site assembling, grouting and hoisting period is too long, the underwater grouting quality requirement is high, and the control difficulty of the construction process and the design parameters is high.

Therefore, in order to effectively utilize abundant offshore wind power resources in China, simplify project implementation procedures and processes, improve construction quality, shorten installation and construction time and reduce fatigue failure at nodes, the structural form of the traditional jacket is improved, and a jacket form with optimal performance, cost and quality is developed.

Disclosure of Invention

The utility model discloses synthesize and provide a mixed jacket of prestressing force cavity intermediate layer steel pipe concrete lattice formula: the upper part is a steel tower cylinder, and the lower part is a lattice type jacket, so that the size of the member is reduced, and the wind load and the wave load on the jacket are obviously reduced. Each rod piece in the lattice type jacket mainly bears axial force, and the strength of materials is fully exerted. The corner post of lattice formula jacket adopts prestressing force cavity intermediate layer steel pipe concrete, reduces the quantity of steel and concrete when increasing rigidity, reduces the weight of each component, is convenient for transport and hoist and mount, and the intermediate layer concrete part sets up pretension method prestressing tendons, follows the whole stretch-draw of high full length, increases the stability and the tensile strength of structure. The oblique supporting member adopts a cross node to pour a concrete steel pipe, and the fatigue performance of the node is improved. The structure is simple, the vertical and the integral stability are good, and the jacket is a brand new fan jacket form. The structural system is completely assembled and constructed, and all components are produced in a standardized way in engineering or on site, so that the construction efficiency is obviously improved, the construction quality is ensured, and the construction measure cost is reduced.

The technical scheme of the utility model as follows:

a prestressed hollow sandwich concrete-filled steel tube lattice type hybrid jacket comprises a fan, a steel tower cylinder, a switching device, a lattice type jacket and steel piles, wherein the fan is arranged on the steel tower cylinder; the corner columns in the lattice type jacket are connected with the steel piles, and lead hammers are kept on installation of the corner columns; the adapter device is connected with the lattice type conduit frame; the lower end of the steel tower cylinder is connected with the switching device; the pretensioned prestressed tendons are arranged in the interlayer concrete of the corner columns along the circumferential direction and are arranged along the vertical through length of the corner columns; the fan is arranged at the upper end of the steel tower cylinder; the centers of the circles of all the corner columns are connected in sequence to form a square or a triangle. The steel pile and the jacket corner post are connected by adopting a flange screw, 4 stiffening ribs with the length being 1.5 times to 2.5 times of the outer diameter length of the steel pipe are uniformly distributed along the circumferential direction of the steel pile and the corner post, the screw is sleeved with a plurality of gaskets, and the thickness of the gaskets is 0.1-2 mm; the length of an angle column in the lattice type jacket is between 15 and 25 meters, the section diameter of the angle column and the thickness of a steel pipe are gradually reduced along the height, the diameter change rate is not more than 10 percent, the angle column is prestressed hollow sandwich steel pipe concrete, 6-10 prestressed tendons are arranged on the sandwich concrete part and are tensioned by adopting a pretensioning method, and the prestressed tendons are prestressed steel strands before concrete is poured in a factory; the inclined rods in the lattice type jacket all adopt common steel pipes; the adapter coupling device adopts a concrete-filled steel tube combined shell, studs are welded in steel plates, concrete is poured, and brackets are arranged at the end part of the concrete-filled steel tube combined shell and are connected with a flange at the lower part of the steel tower cylinder through screws.

The angle post and the diagonal rod in the lattice type jacket are connected by welding seams, a hole is formed in an outer steel pipe of the angle post, the diagonal rod extends into the angle post and is connected with an inner steel pipe, a hole is formed in the end part of the diagonal rod, the prestressed tendon penetrates through the hole, and concrete with the length being 3-5 times of the diameter of the diagonal rod is poured at the intersection point of the diagonal rod; the end part of a corner post in the lattice type jacket is provided with a flange, 4 stiffening ribs with the length of 1.5 times to 2.5 times the outer diameter length of a steel pipe are uniformly distributed along the annular direction and are connected with the lower part of the switching device through a screw rod, and the switching device is provided with 4 stiffening ribs with the length of 1.5 times to 2.5 times the outer diameter length of the steel pipe at the joint of the screw rod.

The angle column in the lattice type jacket is provided with uniform perforated ring partition plates at the upper end and the lower end of a connecting joint, the number of the holes is 6-10, prestressed ribs penetrate through the holes, and 6-10 stiffening ribs with the length of 0.5-1.0 time of the outer diameter of the steel pipe are uniformly arranged along the circumferential direction of the perforated ring partition plates.

The utility model discloses following beneficial effect has for prior art:

(1) the jacket and the steel pile are connected through the multi-gasket flange, so that horizontal deviation generated during pile sinking can be adjusted, and the site construction efficiency is improved.

(2) All components are prefabricated in advance in a factory and are directly assembled on site, so that the construction efficiency is obviously improved, the construction quality is ensured, and the construction measure cost is reduced. The components are connected in a dry type, the construction process is simple and convenient, the construction period is shortened, and the environmental pollution is less.

(3) Each rod piece in the lattice type jacket adopts a standardized size, so that the production and processing efficiency is improved. The structure form is simple, and the installation is convenient. The prestressed hollow sandwich steel pipe concrete is adopted, the prestress enables the whole section of the steel pipe concrete to be pressed, the steel pipe forms a constraint effect on the concrete, and the strength and the ductility of the concrete are improved. The concrete is partially poured at the crossed nodes, so that the fatigue performance of the nodes can be effectively improved, the fatigue life is prolonged, the dead weight is slightly increased, and the material is saved. And (4) the prestressed tendons are tensioned by adopting a pre-tensioning method without an anchorage device, so that the on-site construction efficiency is improved.

Drawings

Fig. 1 is an overall schematic view of the present invention;

FIG. 2 is a schematic view of a multi-shim flange connection;

FIG. 3 is a schematic view of a lattice jacket;

FIG. 4 is a schematic view of a diagonal member cross node;

FIG. 5 is a schematic view of a corner post connection node;

FIG. 6 is a schematic view of a ring spacer;

FIG. 7 is a schematic view of the adapter;

in the figure: 1-a fan, 2-a steel tower barrel, 3-a switching device, 4-a lattice jacket, 5-a steel pile, 6-a corner post, 7-a diagonal rod, 8-a flange, 9-a stiffening rib, 10-a gasket, 11-a prestressed tendon, 12-concrete, 13-a ring partition, 14-an inner steel pipe, 15-an outer steel pipe, 16-an inner steel plate, 17-an outer steel plate, 18-a bolt, 19-a screw and 20-a bracket.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

As shown in fig. 1, a prestressed hollow sandwich steel tube concrete lattice type hybrid conduit frame relates to the technical field of offshore wind power generation. The system comprises a fan (1), a steel tower cylinder (2), a switching device (3), a lattice type jacket (4) and a steel pile (5). The steel pile (5) is positioned in advance and sunk; the corner posts (6) in the lattice type jacket (4) are connected with the steel piles (5), and the lattice type jacket can be designed into a quadrilateral lattice type jacket or a triangular lattice type jacket; the adapter device (3) is connected with the lattice type conduit frame (4); the lower end of the steel tower tube (2) is connected with the switching device (3); the fan (1) is arranged at the upper end of the steel tower barrel (2);

as shown in figure 2, after the steel pile (5) is positioned and driven, flanges (8) are respectively arranged at the top of the steel pile (5) and the bottom of an angle column (6), 4 stiffening ribs (9) are arranged, a plurality of gaskets (10) with the thickness of 0.1-2 mm are arranged in the middle of the flanges, and a screw rod (19) penetrates through the gaskets to be connected with the angle column (6) of the lattice type guide pipe frame (4) and the steel pile (5).

As shown in fig. 3, the lattice jacket (4) is composed of corner posts (6) and diagonal rods (7). The steel pipes are all purchased from finished threaded steel pipes, the steel strength grades are Q390, Q420 and Q460, the concrete strength grades are C50-C80, and the thickness of the steel pipes is 8-16 mm. The angle columns are all vertical to the ground, the diameter of the bottom layer angle column is 1-1.5 m, and the diameter of the steel pipe and the thickness of the steel pipe are gradually reduced along with the increase of the height.

As shown in figure 4, the inclined rods (7) in the lattice type jacket (4) are made of common steel pipes, concrete (12) is partially poured at the cross joints, and the length of the concrete is 3-5 times of the diameter of the inclined rods (7). The end part of the diagonal rod is provided with a hole, and the prestressed tendon (11) passes through the hole.

As shown in figure 5, the corner columns (6) in the lattice type jacket (4) are made of prestressed hollow sandwich steel pipe concrete, the outer layer steel pipe (15) is provided with holes, and the inclined rods (7) penetrate through the holes and extend into the corner columns (6) to be connected with the inner layer steel pipe (14). 2 ring clapboards (13) are arranged above and below the connecting node.

As shown in figure 6, 6-10 holes and 6-10 stiffening ribs (9) are uniformly arranged in the annular partition plate (13) along the annular direction, the prestressed tendons penetrate through the holes in the end parts of the annular partition plate (13) and the inclined rod (7), and the prestressed tendons (11) are arranged along the through length.

As shown in fig. 7, the adapter (3) is composed of an outer steel plate (15), an inner steel plate (16) and concrete (12). The studs (18) are welded at certain intervals on the inner side of the outer steel plate (15) and the outer side of the inner steel plate (16), and then concrete (12) is poured. The upper part of the corner column (6) of the lattice type jacket (4) is provided with 2 stiffening ribs (9) which are connected with the lower part of the adapter device (3) through a screw rod (19). The upper part of the adapter device (3) is connected with a flange (8) at the lower part of the steel tower tube (2), and the screw rod (19) extends into the lower part of a bracket (20) in the adapter device (3).

The specific production and installation method comprises the following steps:

prefabricating a steel pile (5) in a factory, purchasing spiral steel pipe products and completing welding work of the adapter device (3), the inclined rod (7), the flange (8), the stiffening rib (9), the annular partition plate (13) and the stud (18); tensioning and fixing the prestressed tendons (11) in a factory, then pouring hollow sandwich steel pipe concrete and an inclined rod (7) component, and completing the manufacture of the corner columns (6) and the inclined rods (7) in the lattice type jacket (4); after the steel piles (5) are positioned and sunk, and are connected and leveled through a multi-gasket flange, the lattice type jacket (4) is hoisted and connected through bolts, and the angle columns (6) are all kept to be installed with plumbs; after the lattice type jacket is pressed, hoisting the adapter device (3), and connecting the adapter device (3) with the corner post (7) through a bolt; then hoisting the steel tower barrel (2), and connecting the lower part of the steel tower barrel (2) with the adapter (3) through bolts; and finally, installing the fan (1) of the steel tower barrel (2).

Claims

1. A prestressed hollow sandwich steel pipe concrete lattice type mixed jacket comprises a fan (1), a steel tower cylinder (2), a switching device (3), a lattice type jacket (4) and steel piles (5); the method is characterized in that: the corner columns (6) in the lattice type jacket (4) are connected with the steel piles (5), and the mounting of plumbs is kept for the corner columns (6); the adapter device (3) is connected with the lattice type conduit frame (4); the lower end of the steel tower tube (2) is connected with the switching device (3); the pretensioned prestressed tendons (11) are arranged in the interlayer concrete of the corner columns (6) along the circumferential direction and are arranged along the vertical through length of the corner columns (6); the fan (1) is arranged at the upper end of the steel tower barrel (2); the centers of the circles of all the corner columns (6) are connected in sequence to form a square or a triangle.

2. The prestressed hollow sandwich concrete-filled steel tube lattice hybrid jacket according to claim 1, characterized in that: the steel pile (5) is connected with the jacket corner post (6) through a flange (8), 4 stiffening ribs (9) with the length being 1.5 times to 2.5 times of the length of the outer diameter of the steel pipe are uniformly distributed along the circumferential direction of the steel pile and the corner post, a plurality of gaskets (10) are sleeved on the screw rod, and the thickness of the gaskets is 0.1-2 mm; the length of an angle column (6) in the lattice type jacket (4) is 15-25 meters, the section diameter of the angle column and the thickness of a steel pipe are gradually reduced along the height, the diameter change rate is not more than 10%, the angle column (6) is prestressed hollow sandwich steel pipe concrete, 6-10 prestressed tendons are arranged on the sandwich concrete part, and the prestressed tendons (11) adopt prestressed steel strands and are tensioned before concrete is poured in a factory; the inclined rods (7) in the lattice type jacket (4) are all made of common steel pipes; the adapter coupling device (3) adopts a concrete-filled steel tube combined shell, studs (18) are welded in steel plates, concrete is poured, and a bracket (20) is arranged at the end part of the concrete-filled steel tube combined shell and is connected with a flange (8) at the lower part of the steel tower tube (2) through a screw rod (19).

3. The prestressed hollow sandwich concrete-filled steel tube lattice hybrid jacket as claimed in claim 2, wherein: the angle post is characterized in that an inclined rod (7) in the lattice type jacket (4) is connected with an angle post (6) through a welding seam, a hole is formed in an outer steel pipe (15) of the angle post, the inclined rod (7) extends into the angle post and is connected with an inner steel pipe (14), a hole is formed in the end portion of the inclined rod (7), a prestressed rib (11) penetrates through the hole, and concrete with the length being 3-5 times of the diameter of the inclined rod (7) is poured at the crossed joint of the inclined rod (7); the end part of a corner post (6) in the lattice type jacket (4) is provided with a flange (8), 4 stiffening ribs (9) with the length of 1.5 times to 2.5 times the outer diameter length of a steel pipe are uniformly arranged along the annular direction, the stiffening ribs are connected with the lower part of the adapter device (3) through a screw rod (19), and the adapter device (3) is provided with 4 stiffening ribs (9) with the length of 1.5 times to 2.5 times the outer diameter length of the steel pipe at the joint of the screw rod (19).

4. The prestressed hollow sandwich concrete-filled steel tube lattice hybrid jacket according to claim 3, wherein: the angle column (6) in the lattice type jacket (4) is provided with uniform perforated ring partition plates (13) at the upper end and the lower end of a connecting joint, the number of the holes is 6-10, the prestressed ribs (11) penetrate through the holes, and 6-10 stiffening ribs (9) with the length of 0.5-1.0 time of the outer diameter of the steel pipe are uniformly arranged along the circumferential direction of the perforated ring partition plates.