阅读说明：本技术 一种基于箱筒式稳桩平台的施工方法 (Construction method based on box-cylinder type pile stabilizing platform ) 是由 米刘芳 张佩良 何福渤 丁文智 陈强 高永生 刘宝发 陈官禄 王辉 赵雨来 易振 于 2019-09-17 设计创作，主要内容包括：本发明公开了一种基于箱筒式稳桩平台的施工方法,依次通过将箱筒、钢管、固定桁架和移动桁架组装的稳桩平台拖至施工地点、通过对箱筒同步同速抽气固定稳桩平台、将移动桁架上提至水面以上并固定后在其上安装打桩架和抱桩器、将大直径钢管桩吊入抱桩器内并利用其上的顶推装置调节垂直度、大直径钢管桩自沉入泥至稳定状态后沉桩至设计标高位置；移动稳桩平台并重复上述工序直至施工完成；该基于箱筒式稳桩平台的施工方法操作方便,且在施工过程中采用的稳桩平台结构简单,极大提高箱筒式稳桩平台的水平承载力及施工效率,并进一步有效保证大直径钢管桩的施工质量,适用于不同水深、地质条件下的大直径钢管桩施工。(The invention discloses a construction method based on a box-tube type pile stabilizing platform, which comprises the steps of sequentially dragging a pile stabilizing platform assembled by a box tube, a steel tube, a fixed truss and a movable truss to a construction site, synchronously exhausting air at the same speed from the box tube to fix the pile stabilizing platform, lifting the movable truss above the water surface and fixing the truss, then installing a pile driving frame and a pile embracing device on the pile driving frame, hoisting a large-diameter steel tube pile into the pile embracing device, adjusting the verticality by utilizing a pushing device on the pile driving frame, sinking the large-diameter steel tube pile into mud to a stable state and then sinking the pile to a designed elevation position; moving the pile stabilizing platform and repeating the procedures until the construction is finished; the construction method based on the box-cylinder type pile stabilizing platform is convenient to operate, the pile stabilizing platform adopted in the construction process is simple in structure, the horizontal bearing capacity and the construction efficiency of the box-cylinder type pile stabilizing platform are greatly improved, the construction quality of the large-diameter steel pipe pile is further effectively guaranteed, and the construction method is suitable for large-diameter steel pipe pile construction under different water depths and geological conditions.)

1. A construction method based on a box-tube type pile stabilizing platform is characterized in that the box-tube type pile stabilizing platform adopted by the method comprises four box tubes (1), four steel tubes (3), a fixed truss (4), a movable truss (6), a pile driving frame (7) and a pile embracing device (8); wherein, the four steel pipes (3) are respectively vertically arranged and fixed at the centers of the top surfaces of the four box cylinders (1); the fixed truss (4) is of a cubic structure with an opening part on one side, and four top corners of the fixed truss are respectively fixed on the side walls of the bottom ends of the four steel pipes (3), so that the four box barrels (1) are simultaneously supported at the four top corners of the fixed truss (4); the size and the structure of the movable truss (6) and the fixed truss (4) are the same, four vertex angles of the movable truss are respectively provided with a sleeve (6), each sleeve (6) is vertically arranged, the inner diameter of each sleeve is matched with the outer diameter of the steel pipe (3), and the movable truss (6) is enabled to be capable of adjusting the distance in the axial direction of the steel pipe relative to the fixed truss (4) by respectively sleeving the four sleeves (6) on the four steel pipes (3); the opening part of the movable truss (6) and the opening part of the fixed truss (4) are positioned at the same side; the pile driving frame (7) is fixed at the center of the top surface of the movable truss (6); the pile embracing device is fixed on the side wall of one side of the pile driving frame (7), is positioned above the opening part of the movable truss (6), and comprises at least two annular embracing arms (8) positioned on the same axis, and a plurality of pushing devices are uniformly distributed on each annular embracing arm (8) along the circumferential direction;

the specific construction method based on the box-cylinder type pile stabilizing platform comprises the following steps:

s1, putting the pile stabilizing platform formed by assembling the four box barrels (1), the four steel pipes (3), the fixed truss (4) and the movable truss (6) into water through a slide way or land hoisting equipment, and dragging the pile stabilizing platform in a floating state to a construction site by using a tugboat;

s2, connecting the air pumping holes of the four tanks (1) with an air pump through pipelines respectively, and pumping the air in each tank at the same speed simultaneously to ensure that the four tanks (1) sink to preset positions synchronously under the action of negative pressure and are in a stable state;

s3, lifting the movable truss (6) upwards to a position above the water surface, fixing four sleeves of the movable truss on corresponding positions of four steel pipes, installing a pile driving frame (7) at the center of the top surface of the movable truss (6), installing a pile embracing device on the pile driving frame (7), and enabling an annular embracing arm (8) on the pile driving frame to be coaxially arranged and located above the opening parts of the fixed truss (4) and the movable truss (6);

s4, opening a plurality of annular embracing arms (8) of the pile embracing device, closing the embracing arms after the large-diameter steel pipe piles (10) are hung into the pile embracing device, and adjusting the verticality of the large-diameter steel pipe piles through a plurality of pushing devices arranged on the annular embracing arms (8);

s5, hoisting a pile driving hammer for pile sinking construction after the large-diameter steel pipe pile is self-sunk into mud to a stable state until the large-diameter steel pipe pile is sunk to a designed elevation position;

s6, opening an arm of the pile embracing device, moving the pile driving frame and the pile embracing device down to the bottom of the steel pipe again along with the movable truss (6) and fixing, then inflating the box cylinder through an air pump, pulling up the box cylinder pile stabilizing platform under the action of buoyancy to recover to a floating state, and dragging the box cylinder pile stabilizing platform to the next construction site by using a tug boat;

and S7, repeating the steps S2-S6 until the large-diameter steel pipe piles of the rest machine positions are completely sunk.

2. The construction method of a box-and-tube-based pile stabilization platform according to claim 1, wherein the size of the opening portions of the fixed truss (4) and the movable truss (6) is adapted to the diameter of the large-diameter steel pile so that the large-diameter steel pile can be disposed inside the opening portions of the fixed truss (4) and the movable truss (6).

3. The construction method of the box-tube-based pile stabilizing platform according to claim 1, wherein a plurality of reinforcing ribs are uniformly distributed on the bottom end side wall of each steel tube (3) along the circumferential direction, each reinforcing rib is vertically arranged, the inner side of each reinforcing rib is fixed on the side wall of the steel tube (3), and the bottom side of each reinforcing rib is fixed on the top surface of the box tube (1).

4. The box-and-tube-based pile stabilization platform construction method according to claim 1, characterized in that in step S3, when the mud layer under the mud surface at the sinking position of the pile stabilization platform is deep enough, the box (1) is a box with at least one gas compartment inside; when the sludge layer under the sludge surface at the sinking position of the pile stabilizing platform is shallow or is difficult to sink under vacuum negative pressure, the box barrel (1) adopts a box internally provided with at least one gas compartment and at least one water bag.

Technical Field

The invention relates to the technical field of offshore wind power large-diameter steel pipe pile construction, in particular to a construction method based on a box-cylinder type pile stabilizing platform.

Background

The offshore wind turbine foundation mainly comprises a gravity type foundation, a single-pile foundation, a jacket foundation, a bearing platform foundation and the like, wherein the single-pile foundation has the advantages of simplicity in manufacture, no need of seabed arrangement, strong adaptability to terrain, quickness in construction and the like, and is most widely applied to the wind turbine foundation. Along with the increasing power of offshore wind power generators, the diameter, the length and the weight of a large-diameter steel pipe pile single-pile foundation are also increased, and the construction quality and the construction efficiency of the single-pile foundation directly influence the engineering quality and the engineering efficiency.

Published patent application 201611027834.7 discloses a box cylinder pile guide frame and construction process thereof, and it includes box cylinder, truss, steel stand and stop device, and box cylinder top rigid coupling has the truss, and truss top rigid coupling has truss top steel sheet, the rigid coupling has the steel stand on the truss top steel sheet, is connected with stop device through the ring flange on the steel stand, and stop device includes upper and lower layer guide frame platform and upper and lower layer guide frame outrigger mechanism. The pile group construction can be carried out by adjusting the telescopic distance and the rotating angle through the guide frame platform and the overhanging mechanism, the purpose of convenient and rapid installation and movement is realized by utilizing the construction process of vacuumizing, negative pressure sinking of the box-tube structure, and the defect that only small-diameter pile group foundations can be constructed and large-diameter steel pipe piles cannot be constructed is overcome.

Published patent application 201910159922.X discloses a pile stabilizing platform, which comprises a truss structure, a plurality of sections of sleeves, sleeve anti-sinking assemblies, connecting flanges and anchor piles; the truss structure, the sleeve and the sleeve anti-sinking assembly form a pile stabilizing platform main body; four anchor pile channels are arranged in the pile stabilizing platform main body, and the pile stabilizing platform main body is sleeved on the anchor piles through the anchor pile channels; the pile stabilizing platform main body is provided with a bolt, and the anchor pile is provided with a jack; four corners of the truss structure are provided with truss anchor pile channels; the sleeve is a hollow cylindrical structure with a sleeve anchor pile channel arranged inside; the plurality of sections of sleeves are connected through the connecting flanges to form a sleeve whole, the top of the sleeve whole is fixed below the truss structure, and the bottom of the sleeve whole is provided with a sleeve anti-sinking assembly; an anchor pile channel of the anti-sinking component is arranged in the center of the sleeve anti-sinking component; the truss structure, the sleeve are integrally arranged with the anchor pile channel in the sleeve anti-sinking assembly in a coaxial mode. This steady pile platform makes steady pile platform can adapt to the operation of different depth of water through setting up the sleeve of different knots, and it is not enough that steady pile platform weight is big, needs large-scale boats and ships of lifting by crane to carry out the handling installation, and the efficiency of construction is low, and ship machine equipment cost is high.

Published patent application 201810493695.X discloses a pile stabilizing platform, which comprises a truss structure consisting of transverse steel pipes, longitudinal steel pipes and oblique steel pipes, wherein four corners of the truss structure are pile leg passage openings for pile legs to pass through, the bottoms of the pile legs are fixed in pile shoes, ring beams are sleeved on the pile legs, the lower end faces of the ring beams are fixedly connected with turnbuckles, connecting rods are vertically arranged on a first transverse steel pipe, a second transverse steel pipe, a third transverse steel pipe and a fourth transverse steel pipe, and when the pile stabilizing platform is adjusted to any position of the pile legs, the pile stabilizing platform and the pile legs are fixedly connected with the turnbuckles through the connecting rods; the center of steady pile platform is provided with the single pile entrance that supplies the single pile to pass through, and a plurality of hydraulic jack use the single pile entrance to be the annular array setting as the centre of a circle, and when the single pile setting was in single pile entrance department, hydraulic jack drive bracing piece's top moved towards the single pile, fixes a position the single pile through hydraulic jack. The invention effectively adjusts the levelness of the pile stabilizing platform and the verticality of a single pile, and has the defects of large weight of the pile stabilizing platform, low construction efficiency and high cost of ship machinery equipment because a large-scale hoisting ship is needed for hoisting and installation.

Disclosure of Invention

The invention aims to provide a construction method based on a box-cylinder type pile stabilizing platform, which solves the problems of low construction efficiency, high ship-plane configuration requirement and the like of the existing offshore wind power large-diameter steel pipe pile.

Therefore, the technical scheme of the invention is as follows:

a construction method based on a box-tube type pile stabilizing platform is characterized in that the box-tube type pile stabilizing platform adopted by the method comprises four box tubes, four steel tubes, a fixed truss, a movable truss, a pile driving frame and a pile embracing device; wherein, the four steel pipes are respectively vertically arranged and fixed at the centers of the top surfaces of the four box cylinders; the fixed truss is of a cubic structure with an opening part on one side, and four top corners of the fixed truss are respectively fixed on the side walls of the bottom ends of the four steel pipes, so that the four box barrels are simultaneously supported at the four top corners of the fixed truss; the sizes and the structures of the movable truss and the fixed truss are the same, four vertex angles of the movable truss and the fixed truss are respectively provided with a sleeve, each sleeve is vertically arranged, the inner diameter of each sleeve is matched with the outer diameter of the steel pipe, and the movable truss is enabled to be capable of adjusting the distance in the axial direction of the steel pipe relative to the fixed truss by respectively sleeving the four sleeves on the four steel pipes; the opening part of the movable truss and the opening part of the fixed truss are positioned at the same side; the pile driving frame is fixed at the center of the top surface of the movable truss; the pile embracing device is fixed on the side wall of one side of the pile driving frame and is positioned above the opening part of the movable truss, the pile embracing device comprises at least two annular embracing arms positioned on the same axis, and a plurality of pushing devices are uniformly distributed on each annular embracing arm along the circumferential direction;

the specific construction method based on the box-cylinder type pile stabilizing platform comprises the following steps:

s1, putting the pile stabilizing platform formed by assembling the four box cylinders, the four steel pipes, the fixed truss and the movable truss into water through a slide way or land hoisting equipment, and dragging the pile stabilizing platform in a floating state to a construction site by using a tugboat;

s2, connecting the air pumping holes of the four tanks with an air pump through pipelines respectively, and pumping the air in each tank at the same speed simultaneously to ensure that the four tanks sink to preset positions synchronously under the action of negative pressure and are in a stable state;

s3, lifting the movable truss upwards to a position above the water surface, fixing four sleeves of the movable truss on corresponding positions of four steel pipes, installing a pile driving frame at the center of the top surface of the movable truss, installing a pile embracing device on the pile driving frame, and enabling annular embracing arms on the pile driving frame to be coaxially arranged and to be positioned above the opening parts of the fixed truss and the movable truss;

s4, opening a plurality of annular embracing arms of the pile embracing device, closing the embracing arms after the large-diameter steel pipe pile is lifted into the pile embracing device, and adjusting the verticality of the large-diameter steel pipe pile through a plurality of pushing devices arranged on the annular embracing arms;

s5, hoisting a pile driving hammer for pile sinking construction after the large-diameter steel pipe pile is self-sunk into mud to a stable state until the large-diameter steel pipe pile is sunk to a designed elevation position;

s6, opening an arm of the pile embracing device, moving the pile driving frame and the pile embracing device down to the bottom of the steel pipe again along with the movable truss and fixing the pile driving frame and the pile embracing device, then inflating the box cylinder through an air pump, pulling up the box cylinder pile stabilizing platform under the action of buoyancy to recover to a floating state, and dragging the box cylinder pile stabilizing platform to the next construction site by using a tugboat;

and S7, repeating the steps S2-S6 until the large-diameter steel pipe piles of the rest machine positions are completely sunk.

Furthermore, the sizes of the opening parts of the fixed truss and the movable truss are matched with the diameter of the large-diameter steel pile, so that the large-diameter steel pile can be arranged on the inner sides of the opening parts of the fixed truss and the movable truss, and meanwhile, the size of the opening part meets the requirement that the whole truss keeps certain strength.

Furthermore, a plurality of reinforcing rib plates are uniformly distributed on the side wall of the bottom end of each steel pipe along the circumferential direction, each reinforcing rib plate is vertically arranged, the inner side of each reinforcing rib plate is fixed on the side wall of each steel pipe, and the bottom side of each reinforcing rib plate is fixed on the top surface of the box cylinder.

Further, in step S3, when the mud layer under the mud surface at the sinking position of the pile stabilizing platform is deep enough, the box barrel adopts a box barrel with at least one gas compartment inside, so as to ensure that the box barrel sinks to a predetermined position stably, and the inner cavity of the box barrel is filled with mud, so that the box barrel reaches a stable state in the mud; when the mud layer under the mud surface at the sinking position of the pile stabilizing platform is shallow or is difficult to sink under vacuum negative pressure, the box barrel adopts the box barrel internally provided with at least one gas bulkhead and at least one water bag, and after the box barrel is ensured to sink to a preset position stably, the space of the inner cavity of the box barrel, which is not filled with the mud, can fill the space, which is not filled with the mud, with the water filling water bag in a manner of pouring water into the water bag, so that the box barrel reaches a stable state in the mud.

Compared with the prior art, the construction method based on the box-cylinder type pile stabilizing platform is convenient to operate, the pile stabilizing platform adopted in the construction process is simple in structure, the horizontal bearing capacity and the construction efficiency of the box-cylinder type pile stabilizing platform are greatly improved, the construction quality of the large-diameter steel pipe pile is further effectively guaranteed, and the construction method is suitable for large-diameter steel pipe pile construction under different water depths and geological conditions.

Drawings

Fig. 1 is a schematic structural diagram of a box-barrel type pile stabilizing platform based on the construction method of the box-barrel type pile stabilizing platform;

fig. 2 is a schematic structural diagram of a box-cylinder type pile stabilizing platform in a floating state in the construction method based on the box-cylinder type pile stabilizing platform of the invention;

FIG. 3 is a schematic structural diagram of a box-cylinder type pile stabilizing platform in a pile feeding state in the construction method based on the box-cylinder type pile stabilizing platform of the invention;

FIG. 4 is a top view of the box-cylinder type pile stabilizing platform of the construction method based on the box-cylinder type pile stabilizing platform of the present invention;

fig. 5 is a side view of the box-barrel type pile stabilizing platform based on the construction method of the box-barrel type pile stabilizing platform.

Detailed Description

The invention will be further described with reference to the following figures and specific examples, which are not intended to limit the invention in any way.