Rock-penetrating pile sinking construction method for offshore foundation pile

Abstract

According to the rock-penetrating pile sinking construction method for the offshore foundation pile, an adopted construction platform comprises an upper platform body and a lower platform body, installation is convenient, and the structure is stable; the guide structures are arranged on the upper platform and the lower platform respectively, and the pushing devices are arranged at the positions of the guide structures, so that a good positioning and guiding effect can be achieved on a foundation pile or a steel casing, the accuracy and perpendicularity of the sinking position of the foundation pile and the steel casing are guaranteed, and the device can be suitable for structures with different diameters such as the steel casing and the foundation pile. The lower platform comprises a bottom layer truss, a middle layer truss and an upper layer truss, the guide cylinder is arranged on the outer side of the middle layer truss, a fence is arranged around the middle layer truss, a stair is arranged between the middle layer truss and the upper layer truss, and constructors firstly go down to the upper layer truss of the lower platform from the upper platform and then go down to the middle layer truss through the stair. Therefore, a constructor can adjust the foundation pile or the steel casing in the guide cylinder on the middle-layer truss and observe the construction condition in real time.

Description

Technical Field

[0001] The invention belongs to the technical field of offshore construction, and in particular relates to a rock-penetrating pile-sinking construction method for offshore foundation piles. Background Art

[0002] With the proposal of the "dual carbon" goal, the wind power industry has developed rapidly as one of the important means to achieve this goal. The number of installed capacity has increased year by year, and offshore wind power has ushered in new opportunities. However, with the continuous increase in the capacity of wind turbines and the scale of single wind farms, the wind farms are farther and farther from the shore and the water depth is getting deeper. As offshore power transmission efficiency and safety and stability are increasingly frequent, offshore booster stations are used more and more frequently. In most cases, offshore booster stations use a four-pile jacket foundation with a post-pile method. However, in the Datang Hainan Danzhou project, the foundation geology of the booster station contains rock interlayers, and the rock strata are weathered to varying degrees, so piles cannot be directly sunk. During construction, drilling and rock penetration are required. In order to ensure construction efficiency and quality, a special construction platform has been developed. Summary of the invention

[0003] The present invention mainly aims to overcome the deficiencies of the prior art and provides a rock-penetrating pile-sinking construction method for offshore foundation piles.

[0004] The present invention is achieved through the following technical solutions:

[0005] A rock-penetrating pile construction method for offshore foundation piles, wherein the construction platform used comprises an upper platform and a lower platform;

[0006] The upper platform comprises an upper platform body, a plurality of upper guide openings are arranged on the upper platform body, and a plurality of jacking devices are arranged around each guide opening, which are used to fine-tune the position of the foundation pile or steel casing in the guide opening and to adapt to the foundation pile and steel casing of different diameters; a plurality of vertical fixing columns are arranged on the upper platform body, the bottom of the vertical fixing column extends out of the upper platform body for a certain length, and the bottom of the vertical fixing column is used to be inserted into the lower platform and docked with the lower platform; a hoisting connection part is arranged on the top of the vertical fixing column;

[0007] The lower platform comprises a lower platform body, on which a plurality of vertical positioning piles are arranged, and a docking sleeve for docking with the vertical fixing column of the upper platform is arranged on the top of the vertical positioning pile, and the bottom of the vertical fixing column is inserted into the docking sleeve, so that the upper platform is fixedly installed on the lower platform; a plurality of guide cylinders are arranged on the lower platform body, and the guide cylinders are located directly below the guide opening of the upper platform, and a plurality of jacking devices are also arranged around each guide cylinder;

[0008] The construction method comprises the following steps:

[0009] Step 1: hoist and transport the lower platform to the target location at sea, so that the bottom of the lower platform is supported on the seabed;

[0010] Step 2: Hoist the upper platform, insert the bottom of the vertical fixing column of the upper platform into the docking sleeve at the top of the vertical positioning pile of the lower platform, and lock and fix it, so that the upper platform is stably fixed on the lower platform;

[0011] Step 3: Deploy rock drilling related equipment on the upper platform;

[0012] Step 4: Insert the steel casing downward into the guide port of the upper platform and the guide tube of the lower platform in turn, adjust the jacking device around the guide port and the jacking device around the guide tube to make the steel casing reach a vertical state, and insert the bottom of the steel casing into the seabed mud surface; then put the drill bit into the steel casing, start the drill bit, drill downward, so that the steel casing and the drill bit move downward synchronously, pass through the rock layer, and reach the set depth;

[0013] Step 5: Remove the steel casing and drill bit upwards, and then insert the foundation pile into the guide port of the upper platform and the guide cylinder of the lower platform. By adjusting the jacking device around the guide port and the jacking device around the guide cylinder, make the foundation pile reach the vertical state and target position and align with the drill hole; then drive the foundation pile downward into the drill hole to reach the set depth.

[0014] In the above technical solution, the upper platform body is a rectangular frame structure, which is welded by cross beams, longitudinal beams and oblique support rods, and a flat plate is laid on the top surface of the upper platform body to form a construction platform, on which construction equipment can be set.

[0015] In the above technical solution, the number of guide openings is 4, arranged in a rectangular shape, and are respectively located at the 4 top corners of the upper platform body; the number of vertical fixed columns is 4, arranged in a rectangular shape; the number of vertical positioning piles is 4, distributed in a rectangular shape; the number of guide cylinders is 4, distributed in a rectangular shape.

[0016] In the above technical solution, the jacking device may adopt a hydraulic push rod, or may also adopt a manually adjustable jacking bolt structure.

[0017] In the above technical solution, the upper opening of the guide cylinder is provided with a conical guide ring with a diameter gradually expanding from bottom to top, so as to facilitate the insertion of the foundation pile or the steel casing into the guide cylinder.

[0018] In the above technical solution, the lower platform body includes a bottom truss, a middle truss and an upper truss arranged from bottom to top, and the bottom truss and the middle truss as well as the middle truss and the upper truss are connected by diagonal braces to form a stable connection structure.

[0019] In the above technical solution, the guide cylinder is located at the lower outer side of the middle truss of the lower platform body, and a fence is arranged around the middle truss, and stairs are arranged between the middle truss and the upper truss. Construction workers can first go down from the upper platform to the upper truss of the lower platform, and then go down to the middle truss through the stairs, so that the construction workers can adjust the foundation piles or steel casings in the guide cylinder on the middle truss and observe the construction situation in real time. The fence ensures the safety of the construction workers.

[0020] In the above technical solution, the guide cylinder is fixedly connected to the lower platform body via a connecting frame, and the inner end of the connecting frame is fixedly connected to the vertical positioning piles and the middle truss on the lower platform body, thereby ensuring the connection strength of the guide cylinder.

[0021] The advantages and beneficial effects of the present invention are:

[0022] The present invention realizes drilling holes on the seabed, passing through the seabed rock layer, and using steel casings to prevent the hole from collapsing; and after the drilling is completed, the construction platform of the present invention can also accurately and vertically sink the foundation piles into the borehole to the target depth. That is, guide structures are respectively provided on the upper platform and the lower platform of the construction platform of the present invention, and a jacking device is provided at the position of the guide structure, so that the foundation piles or steel casings can be well positioned and guided, ensuring the accurate position and verticality of the sinking of the foundation piles and steel casings, and can be applicable to structures with different diameters such as steel casings and foundation piles.

[0023] The construction platform of the present invention is formed by connecting and assembling an upper platform and a lower platform through vertical positioning piles, which is convenient for installation and has a stable structure.

[0024] The lower platform of the present invention includes a bottom truss, a middle truss and an upper truss arranged at intervals from bottom to top. The bottom truss and the middle truss, as well as the middle truss and the upper truss are connected by diagonal braces to form a stable connection structure. The guide cylinder is arranged at a lower position on the outer side of the middle truss, and a fence is arranged around the middle truss, and stairs are arranged between the middle truss and the upper truss. Construction workers can first go down from the upper platform to the upper truss of the lower platform, and then go down to the middle truss via the stairs, so that the construction workers can adjust the foundation piles or steel casings in the guide cylinder on the middle truss and observe the construction situation in real time. The fence ensures the safety of the construction workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is the front view of the construction platform of the present invention.

[0026] Figure 2 It is a side view of the construction platform of the present invention.

[0027] Figure 3It is a front view of the upper platform of the construction platform of the present invention.

[0028] Figure 4 It is a top view of the upper platform in the construction platform of the present invention.

[0029] Figure 5 It is a top view of the vertical fixing column of the upper platform in the construction platform of the present invention.

[0030] Figure 6 FIG. 1 is a top view of the lower platform in the construction platform of the present invention, that is, Figure 1 A-section view.

[0031] Figure 7 It is a cross-sectional top view of the guide cylinder of the lower platform in the construction platform of the present invention.

[0032] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with specific embodiments.

[0034] An offshore construction platform comprises an upper platform 100 and a lower platform 200. The upper platform 100 is installed on the top of the lower platform 200.

[0035] The upper platform 100 includes an upper platform body 1. Preferably, the upper platform body 1 is a rectangular frame structure, which is welded by a cross beam 11, a longitudinal beam 12 and an oblique support rod 13, and a flat plate is laid on the top surface of the upper platform body 1 to form a construction platform, on which construction equipment can be set; four upper guide openings 14 are arranged on the upper platform body 1, and the four upper guide openings 14 are arranged in a rectangular shape and are respectively located at four vertex positions on the upper platform body 1; further, the guide opening 14 is a circular opening. During construction, the foundation piles (the foundation piles are steel pipe piles) or steel casings (the steel casings are used for rock-penetrating construction, and the construction process will be described in detail later) are inserted into the guide openings 14 to play a positioning and guiding role.

[0036] Four vertical fixing columns 15 are also provided on the upper platform body 1. Preferably, the four vertical fixing columns are arranged in a rectangular shape and are respectively located on the inner sides of the four guide openings 14 on the upper platform body 1. The bottom of the vertical fixing column 15 extends out of the upper platform body 1 for a certain length. The bottom of the vertical fixing column 15 is used to be inserted into the lower platform 200 and dock with the lower platform 200. A lifting connection part is provided on the top of the vertical fixing column 15. Preferably, the lifting connection part adopts a lifting hole structure 16 for connecting with the hook of the crane, so as to move the upper platform 100 by the crane to realize the installation and disassembly between the upper platform 100 and the lower platform 200. For further explanation, see the attached Figure 5 The vertical fixing column 15 is welded to the cross beam and longitudinal beam of the upper platform body 1 through a plurality of connecting rods 151 to form a stable connection structure.

[0037] A plurality of jacking devices 17 are also provided around the guide opening 14 on the upper platform body 1. The number of jacking devices is preferably 3-9, which are evenly arranged along the circumference of the guide opening 14. By adjusting the extension length of the jacking device, the front end of the jacking device acts on the outer wall of the foundation pile or steel casing in the guide opening 14, thereby achieving the effect of fine-tuning the position of the foundation pile or steel casing in the guide opening 14 and adapting to the foundation pile and steel casing of different diameters. Preferably, the jacking device can adopt a hydraulic push rod, or a manually adjustable jacking bolt structure.

[0038] The lower platform 200 includes a lower platform body 2, on which four vertical positioning piles 21 are arranged. The four vertical positioning piles 21 are distributed in a rectangular shape and serve as the main support of the entire lower platform 200; docking sleeves 21 for docking with the vertical fixing columns 15 of the upper platform 100 are arranged on the tops of the four vertical positioning piles 21, and the bottoms of the vertical fixing columns 15 are inserted into the docking sleeves 211 and locked and fixed, so as to achieve stable fixed installation of the upper platform 100 on the lower platform 200; further, preferably, the lower platform body 2 includes a bottom truss 22, a middle truss 23 and an upper truss 24 arranged at intervals from bottom to top, and the bottom truss 22 and the middle truss 23 as well as the middle truss 23 and the upper truss 24 are respectively connected by diagonal braces 27 to form a stable connection structure.

[0039] The lower platform body 2 is provided with four guide cylinders 25, which are arranged in a rectangular shape and are located directly below the guide opening 14 of the upper platform. In addition, a plurality of push devices 251 are also provided around each guide cylinder 25. Figure 7Preferably, 3-6 jacking devices 251 are arranged on the wall of each guide cylinder 25, evenly distributed along the circumference of the guide cylinder, and the positions of the foundation piles or steel casings in the guide cylinder 25 are fine-tuned by these jacking devices 251, and the guide cylinder 25 of the lower platform is adapted to the foundation piles and steel casings of different diameters. In this way, during construction, the foundation piles or steel casings are inserted into the guide opening 14 of the upper platform, and then inserted into the guide cylinder 25 of the lower platform. The guide opening 14 positions and guides the upper section of the foundation piles or steel casings, and the guide cylinder 25 positions and guides the lower section of the foundation piles or steel casings, thereby achieving good positioning and guiding effects on the entire foundation piles and steel casings, and ensuring the accuracy and verticality of the sinking positions of the foundation piles and steel casings.

[0040] Furthermore, the upper opening of the guide cylinder 25 is provided with a tapered guide ring 252 (see attached Figure 1 ), so as to facilitate the insertion of the foundation pile or steel casing into the guide tube 25.

[0041] Furthermore, the guide cylinder 25 is located at the lower outer side of the middle truss 23 of the lower platform body 2, and a fence 231 is arranged around the middle truss 23, and a staircase 232 is arranged between the middle truss 23 and the upper truss 24. Construction workers can first go down from the upper platform to the upper truss 24 of the lower platform, and then go down to the middle truss 23 through the staircase 232, so that the construction workers can adjust the foundation piles or steel casings in the guide cylinder 25 on the middle truss 23 and observe the construction status in real time. The fence 231 ensures the safety of the construction workers.

[0042] Furthermore, the guide cylinder 25 is fixedly connected to the lower platform body 2 via a connecting frame 26. Preferably, the connecting frame 26 is composed of multiple connecting rods, and the inner ends of the connecting frames 26 are fixedly connected to the vertical positioning piles 21 and the middle trusses 23 on the lower platform body 2, thereby ensuring the connection strength of the guide cylinder 25.

[0043] The rock-penetrating pile construction method for offshore foundation piles using the above-mentioned construction platform comprises the following steps:

[0044] Step 1: Hoist and transport the lower platform to the target offshore location so that the bottom of the lower platform is supported on the seabed.

[0045] Step 2: Lift the upper platform so that the bottom of the vertical fixing column of the upper platform is inserted into the docking sleeve at the top of the vertical positioning pile of the lower platform, and lock it to achieve stable fixed installation of the upper platform on the lower platform.

[0046] Step 3: Deploy rock drilling related equipment on the upper platform.

[0047] Step 4: Insert the steel casing downward into the guide port 14 of the upper platform and the guide cylinder 25 of the lower platform in turn, adjust the jacking device around the guide port 14 and the jacking device around the guide cylinder 25, make the steel casing reach a vertical state, and insert the bottom of the steel casing into the seabed mud surface; then put the drill bit into the steel casing, start the drill bit, and drill downward, so that the steel casing and the drill bit move downward synchronously, pass through the rock layer, and reach the set depth.

[0048] Step 5: Take out the steel casing and drill bit upwards, and then insert the foundation pile into the guide port 14 of the upper platform and the guide cylinder 25 of the lower platform. By adjusting the jacking device around the guide port 14 and the jacking device around the guide cylinder 25, the foundation pile reaches a vertical state and a target position and is aligned with the borehole; then drive the foundation pile downward into the borehole to reach the set depth.

[0049] For ease of explanation, spatial relative terms such as "upper", "lower", "left", "right" and the like are used in the embodiments to illustrate the relationship of one element or feature shown in the figure relative to another element or feature. It should be understood that, in addition to the orientation shown in the figure, the spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be positioned "on" other elements or features. Therefore, the exemplary term "under" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0050] Furthermore, relational terms such as “first” and “second” and the like are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0051] The present invention is described above by way of example. It should be noted that, without departing from the core of the present invention, any simple deformation, modification or other equivalent replacement that can be made by those skilled in the art without inventive effort falls within the protection scope of the present invention.

Claims

1. A rock-penetrating pile construction method for offshore foundation piles, characterized in that: The construction platform used consists of two parts: the upper platform and the lower platform; The upper platform comprises an upper platform body, a plurality of upper guide openings are arranged on the upper platform body, and a plurality of jacking devices are arranged around each guide opening, which are used to fine-tune the position of the foundation pile or steel casing in the guide opening and to adapt to the foundation pile and steel casing of different diameters; a plurality of vertical fixing columns are arranged on the upper platform body, the bottom of the vertical fixing column extends out of the upper platform body for a certain length, and the bottom of the vertical fixing column is used to be inserted into the lower platform and docked with the lower platform; a hoisting connection part is arranged on the top of the vertical fixing column; The lower platform comprises a lower platform body, on which a plurality of vertical positioning piles are arranged, and a docking sleeve for docking with the vertical fixing column of the upper platform is arranged on the top of the vertical positioning pile, and the bottom of the vertical fixing column is inserted into the docking sleeve, so that the upper platform is fixedly installed on the lower platform; a plurality of guide cylinders are arranged on the lower platform body, and the guide cylinders are located directly below the guide opening of the upper platform, and a plurality of jacking devices are also arranged around each guide cylinder; The construction method comprises the following steps: Step 1: hoist and transport the lower platform to the target location at sea, so that the bottom of the lower platform is supported on the seabed; Step 2: Hoist the upper platform, insert the bottom of the vertical fixing column of the upper platform into the docking sleeve at the top of the vertical positioning pile of the lower platform, and lock and fix it, so that the upper platform is stably fixed on the lower platform; Step 3: Deploy rock drilling related equipment on the upper platform; Step 4: Insert the steel casing downward into the guide port of the upper platform and the guide tube of the lower platform in turn, adjust the jacking device around the guide port and the jacking device around the guide tube to make the steel casing reach a vertical state, and insert the bottom of the steel casing into the seabed mud surface; then put the drill bit into the steel casing, start the drill bit, drill downward, so that the steel casing and the drill bit move downward synchronously, pass through the rock layer, and reach the set depth; Step 5: Remove the steel casing and drill bit upwards, and then insert the foundation pile into the guide port of the upper platform and the guide cylinder of the lower platform. By adjusting the jacking device around the guide port and the jacking device around the guide cylinder, make the foundation pile reach the vertical state and target position and align with the drill hole; then drive the foundation pile downward into the drill hole to reach the set depth.

2. The rock-penetrating pile construction method for offshore foundation piles according to claim 1 is characterized in that: The upper platform body is a rectangular frame structure, and a flat plate is laid on the top surface of the upper platform body.

3. The rock-penetrating pile construction method for offshore foundation piles according to claim 1 is characterized in that: There are four guide openings arranged in a rectangular shape, respectively located at four vertex positions on the upper platform body; there are four vertical fixing columns arranged in a rectangular shape.

4. The rock-penetrating pile construction method for offshore foundation piles according to claim 3 is characterized in that: The number of the vertical positioning piles is 4 and they are distributed in a rectangular shape; the number of the guide cylinders is 4 and they are distributed in a rectangular shape.

5. The rock-penetrating pile construction method for offshore foundation piles according to claim 1 is characterized in that: The jacking device adopts a hydraulic push rod, or a manually adjusted jacking bolt structure.

6. The rock-penetrating pile construction method for offshore foundation piles according to claim 1, characterized in that: The upper opening of the guide cylinder is provided with a conical guide ring with a diameter gradually expanding from bottom to top.

7. The rock-penetrating pile construction method for offshore foundation piles according to claim 1, characterized in that: The lower platform body includes a bottom truss, a middle truss and an upper truss which are arranged from bottom to top at intervals. The bottom truss and the middle truss as well as the middle truss and the upper truss are connected respectively by diagonal braces.

8. The rock-penetrating pile construction method for offshore foundation piles according to claim 7, characterized in that: The guide cylinder is located at the lower outer side of the middle truss of the lower platform body, and a fence is arranged around the middle truss, and a staircase is arranged between the middle truss and the upper truss.

9. The rock-penetrating pile construction method for offshore foundation piles according to claim 7, characterized in that: The guide cylinder is fixedly connected to the lower platform body through a connecting frame.

10. The rock-penetrating pile construction method for offshore foundation piles according to claim 9, characterized in that: The inner end of the connecting frame is fixedly connected to the vertical positioning piles and the middle truss on the lower platform body.

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