A method of simulating installation of a steel pile into a skirt pile sleeve and a simulation pile

Abstract

The application discloses a method for simulating installation of a steel pile in a skirt pile sleeve and a simulation pile. The method can ensure that a packer serving between the skirt pile sleeve and the steel pile achieves the effect of expansion sealing in the later stage, and guarantees that concrete slurry is not leaked. In addition, the application also discloses a simulation pile. According to different pipe diameters of the skirt pile sleeve, a series of coiled pipe sections are designed and manufactured, so that the pipe diameter range is fully covered, the simulation pile can be repeatedly matched, material waste is reduced, construction procedures are optimized, and construction strength is reduced.

Description

Technical Field

[0001] This invention relates to the field of offshore oil pipeline installation, specifically to a method for simulating the installation of steel piles on a skirt pile sleeve and a simulated pile. Background Technology

[0002] In nearshore marine engineering, pile-based jackets are the most common and economical fixed marine structures in offshore oil engineering. Jackets are classified into shallow-water jackets and deep-water jackets based on their service depth. Steel piles are tubular steel structures used to fix pile-based jackets. They penetrate the skirt sleeve of the deep-water pile-based jacket and are driven below the seabed mud surface, serving as a crucial connection to ensure the jacket is firmly anchored to the seabed. The steel piles are in close contact with the packers at the upper and lower ends of the skirt sleeve. The inner wall of the skirt sleeve, the upper and lower packers, and the outer wall of the steel pile inside the skirt sleeve form a closed annular space. After concrete slurry is driven in and hardens, the steel piles, the skirt sleeve, and even the entire jacket form a rigid connection, ensuring the jacket is firmly anchored to the seabed. This ensures that the jacket remains relatively stationary with the modules under various complex mechanical conditions such as waves and currents during service, guaranteeing safe operation for both the jacket and the modules.

[0003] The onshore construction of deep-water jacket structures generally adopts the horizontal construction method. After the prefabricated skirt pile sleeves are welded together, packers need to be installed according to the manufacturer's information. In order to ensure that the packers achieve an expansion seal between the skirt pile sleeves and the steel piles during later service and to prevent concrete slurry from leaking out, a section of simulated pile needs to be made during onshore construction. The packers inserted into the skirt pile sleeves are then used for onshore testing to ensure a good sealing effect.

[0004] Currently, during on-site construction, simulated piles often require the on-site sourcing of materials to re-roll single pipe sections based on the different diameters of the skirt pile sleeves. These temporary pipe sections are then temporarily inserted into the packers of the skirt pile sleeves for sealing tests, and discarded after use. This process is intensive, inefficient, and the temporary single pipe sections are not universally compatible with packers of different skirt pile diameters, resulting in low reuse rates and material waste. Summary of the Invention

[0005] This invention provides a method for simulating the installation of steel piles in a skirt pile sleeve and a simulated pile, which can simulate the insertion of steel piles and can adapt to skirt pile sleeves of different pipe diameters.

[0006] To solve the above-mentioned technical problems, the present invention provides a method for simulating the installation of steel piles on a skirt pile sleeve and a simulated pile, which is achieved through the following steps:

[0007] S1. Based on the inner wall dimensions of the skirt pile sleeve to be installed on site, prefabricate two sections of outer pipe, two sections of inner pipe, pipe connecting rod, steel plate, ear-type lifting points and horse rack, and assemble them, ensuring that the simulated pile can be inserted into the inner wall of the skirt pile sleeve.

[0008] S2. After the simulated pile is prefabricated, it is lifted horizontally by a crane using the lugs on the tubular connecting rod, ensuring that the simulated pile is level during the lifting process.

[0009] S3. After the simulated pile is hoisted horizontally and without tilting, the simulated pile is slowly and horizontally inserted into the skirt pile sleeve by a crane.

[0010] S4. Insert the simulated pile into the middle position of the packer to complete the assembly of the simulated pile;

[0011] S5. After assembly, pressure test is carried out according to the relevant pressure test procedure to ensure that the packer airbag expands and wraps the simulated pile, thus completing the pressure test and completing the method of installing the simulated steel pile on the skirt sleeve.

[0012] A simulated pile includes two outer pipes, two inner pipes, several steel plates, a tubular connecting rod, lug-type suspension points, and a support frame. The two inner pipes are fixed to both ends of the tubular connecting rod by the steel plates. One end of the steel plate is fixed to the inner wall of the inner pipe, and the other end is fixed to the outer wall of the tubular connecting rod. The two outer pipes are respectively located around the two inner pipes. Several bolts are provided on the wall of the inner pipe. The bolts are threaded to the inner pipe. The tail end of the bolt passes through the wall of the inner pipe and abuts against the inner wall of the outer pipe, so that there is a gap between the inner pipe and the outer pipe. The support frame is provided between the outer wall of the inner pipe and the inner wall of the outer pipe for fixing the inner pipe and the outer pipe.

[0013] Furthermore, three steel plates are provided between the inner tube and the outer tube at one end.

[0014] The technical effect of this invention is as follows: This invention discloses a method for simulating the installation of steel piles in skirt pile sleeves. By making a section of simulated pile during construction on land and inserting a packer into the skirt pile sleeve for land testing, it can ensure that the packer achieves an expansion seal between the skirt pile sleeve and the steel pile during later service, thus preventing concrete slurry from leaking out.

[0015] The present invention also discloses a simulated pile, which can design and manufacture a series of rolled pipe sections according to different pipe diameters of the skirt pile sleeve, so that the pipe diameter range is fully covered, can be reused, reduce material waste, optimize construction procedures, and reduce construction intensity. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the simulated pile in this invention.

[0017] Figure 2 This is the left view of the simulated pile in this invention.

[0018] Figure 3 This is the front view of the simulated pile in this invention.

[0019] Figure 4 This is a three-dimensional schematic diagram of the simulated pile and packer before they are snapped together in this invention.

[0020] Reference numerals: 1-Tube connecting rod; 2-Inner tube; 3-Outer tube; 4-Steel plate; 5-Bolt; 6-Horse rod; 7-Ear-type lifting lug; 8-Packard. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0022] Examples, such as Figure 1 As shown, this invention discloses a method for simulating the installation of steel piles on a skirt pile sleeve, and the specific implementation of each step is as follows:

[0023] S1. Based on the inner wall dimensions of the skirt pile sleeve installed on site, prefabricate two outer pipe sections 3, two inner pipe sections 2, tubular connecting rod 1, steel plate 4, ear-type lifting points and horse-shaped support 6, and assemble them to ensure that the simulated pile can be inserted into the inner wall of the skirt pile sleeve.

[0024] S2. After the simulated pile is prefabricated, it is lifted horizontally by a crane using the lug-type lifting points on the tubular connecting rod 1, and the simulated pile is kept horizontal during the lifting process.

[0025] S3. After the simulated pile is hoisted horizontally and without tilting, the simulated pile is slowly and horizontally inserted into the skirt pile sleeve by a crane.

[0026] S4. Insert the simulated pile into the middle position of the packer 8 to complete the assembly of the simulated pile;

[0027] S5. After assembly, pressure test is carried out according to the relevant pressure test procedure to ensure that the packer 8 airbags expand and wrap around the simulated pile, thus completing the pressure test and completing the method of installing the simulated steel pile on the skirt sleeve.

[0028] A simulated pile includes two outer pipes 3, two inner pipes 2, several steel plates 4, a tubular connecting rod 1, lug-type suspension points, and a support frame 6. The two inner pipes 2 are fixed to both ends of the tubular connecting rod 1 by the steel plates 4. One end of the steel plate 4 is fixed to the inner wall of the inner pipe 2, and the other end is fixed to the outer wall of the tubular connecting rod 1. The two outer pipes 3 are respectively located around the two inner pipes 2. Several bolts 5 are provided on the wall of the inner pipe 2. The bolts 5 are threaded to the inner pipe 2, and the tail end of the bolt 5 passes through the wall of the inner pipe 2 and abuts against the inner wall of the outer pipe 3, creating a gap between the inner pipe 2 and the outer pipe 3. The support frame 6 is provided between the outer wall of the inner pipe 2 and the inner wall of the outer pipe 3 for fixing the inner pipe 2 and the outer pipe 3. Six steel plates 4 are provided between the inner pipe 2 and the outer pipe 3.

[0029] Simulated piles are prefabricated through the following steps:

[0030] 1. Prefabricate a section of tubular connecting rod 1, and prefabricate a simulated pile head of the corresponding size according to the inner wall size of the skirt pile sleeve installed on site, ensuring that the outer diameter of the simulated pile head is smaller than the inner wall of the skirt pile sleeve;

[0031] 2. Prefabricate two ear-type lifting points, make circular holes in ear-type lifting lugs 7, and install them symmetrically on the outer wall of the tubular connecting rod 1 after prefabrication, for the purpose of adjusting the simulated pile lifting and positioning;

[0032] 3. Precast two sections of simulated pile inner pipe 2, and precast six rectangular steel plates 4;

[0033] 4. The ends of the tubular connecting rod 1 are placed at the center of the inner tube 2 of the simulated pile;

[0034] 5. Fix one end of the three rectangular steel plates 4 to the inner wall of the inner tube 2 and the other end to the outer wall of the tubular connecting rod 1, ensuring that the angle between two adjacent steel plates 4 is 120°. Install the other end in the same way as the inner tube 2 of the pile.

[0035] 6. Make three circular holes on the outer wall of the inner tube 2 of the simulated pile on both sides, and the positions of the holes are as follows: Figure 2 As shown;

[0036] 7. After the hole is opened, three sets of bolts 5 of the same size as the round hole are installed. The circumferential angle between two adjacent sets of bolts 5 is 120°, and the bolts 5 are threaded to the inner tube 2.

[0037] 8. Prefabricate two sections of simulated pile outer pipe 3, and insert the installed tubular connecting rod 1 and two sections of inner pipe 2 into the two sections of simulated pile outer pipe 3 respectively;

[0038] 9. Rotate bolt 5 so that the tail end of bolt 5 abuts against the inner wall of outer tube 3 for initial fixation;

[0039] 10. Weld the 6-pile frame to the two outer pipe sections 3 and the two inner pipe sections 2 for secondary fixation, thus completing the prefabrication of the adjustable simulated pile.

[0040] The above-described embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the claims.

Claims

1. A simulated pile, characterized in that: The device includes two outer tubes, two inner tubes, several steel plates, a tubular connecting rod, lug-type lifting points, and a support frame. The two inner tubes are fixed to both ends of the tubular connecting rod by the steel plates. One end of the steel plate is fixed to the inner wall of the inner tube, and the other end is fixed to the outer wall of the tubular connecting rod. The two outer tubes are respectively located around the two inner tubes. Several bolts are provided on the wall of the inner tube. The bolts are threaded to the inner tubes. The tail end of the bolt passes through the wall of the inner tube and abuts against the inner wall of the outer tube, creating a gap between the inner tubes and the outer tubes. The support frame is provided between the outer wall of the inner tube and the inner wall of the outer tube for fixing the inner tubes and the outer tubes.

2. The simulated pile according to claim 1, characterized in that: Three steel plates are provided between the inner tube and the outer tube at one end.

3. A method for installing a simulated pile as described in claim 1 or 2 onto a skirt pile sleeve, characterized by the following steps: S1. Based on the inner wall dimensions of the skirt pile sleeve to be installed on site, prefabricate two outer pipe sections, two inner pipe sections, a tubular connecting rod, a steel plate, lug-type lifting points, and a support frame. The two inner pipe sections are fixed to both ends of the tubular connecting rod by the steel plate. One end of the steel plate is fixed to the inner wall of the inner pipe, and the other end is fixed to the outer wall of the tubular connecting rod. The two outer pipe sections are respectively located around the two inner pipe sections. Several bolts are provided on the pipe wall of the inner pipe. The bolts are threaded to the inner pipe. The tail end of the bolt passes through the pipe wall of the inner pipe and abuts against the inner wall of the outer pipe, so that there is a gap between the inner pipe and the outer pipe. The support frame is provided between the outer wall of the inner pipe and the inner wall of the outer pipe for fixing the inner pipe and the outer pipe. The simulated pile is assembled to ensure that the simulated pile can be inserted into the inner wall of the skirt pile sleeve. S2. After the simulated pile is prefabricated, it is lifted horizontally by a crane using the lugs on the tubular connecting rod, ensuring that the simulated pile is level during the lifting process. S3. After the simulated pile is hoisted horizontally and without tilting, the simulated pile is slowly and horizontally inserted into the skirt pile sleeve by a crane. S4. Insert the simulated pile into the middle position of the packer to complete the assembly of the simulated pile; S5. After assembly, pressure test is carried out according to the relevant pressure test procedure to ensure that the packer airbag expands and wraps the simulated pile, thus completing the pressure test and completing the method of installing the simulated steel pile on the skirt sleeve.

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