CN106948366B - Barrel-shaped foundation and auxiliary assembly convenient for controlling verticality and construction method - Google Patents

Abstract

The invention discloses a barrel-shaped foundation and an auxiliary component convenient for controlling verticality and a construction method, wherein the barrel-shaped foundation comprises a barrel-shaped foundation body which is an inverted barrel body, three positioning sleeves which are uniformly distributed along a ring shape and penetrate through a top plate of the barrel body are arranged on the inner wall of the barrel body, and a water inlet and outlet valve connected with a water pumping system is arranged on the upper end surface of the barrel body; the auxiliary assembly comprises a triangular locating rack and three locating steel piles vertically driven into the seabed by using the triangular locating rack; the barrel-shaped foundation is movably sleeved on the three positioning steel piles, and the barrel body is immersed into the sea to contact the seabed and is penetrated to the designed depth. According to the invention, the problem of perpendicularity in the penetration process of the barrel-shaped foundation is converted into the problem of perpendicularity of the positioning steel pile, so that the perpendicularity of the barrel-shaped foundation automatically meets the requirement as long as the perpendicularity of the positioning steel pile meets the requirement, and subsequent leveling and correction are not needed, so that the construction process of the barrel-shaped foundation is greatly simplified, the construction difficulty is greatly reduced, the offshore operation time is shortened, and the construction cost is reduced.

Description

A barrel-shaped foundation and auxiliary components for easy control of verticality and construction method

Technical areas:

The present invention relates to offshore platforms and offshore wind turbine foundations, specifically to a suction barrel foundation, and in particular to a barrel foundation and auxiliary components and construction methods that facilitate vertical control.

Background technique:

The barrel foundation was produced in Norway in the 1990s. It is a circular plate foundation with a skirt. Due to its characteristics of reducing the amount of work, saving investment, shortening offshore construction time, and being reusable, it has been gradually used in Offshore platforms and offshore wind turbine foundations.

The barrel-shaped foundation needs to be kept vertical during the sinking process. If it tilts to a certain extent, it needs to be leveled to keep it vertical, otherwise its function will be affected. Reference [1] introduces the construction of barrel foundation in an oil field in the Bohai Sea. During the construction process, the barrel foundation tilted, the barrel wall suffered excessive deformation and cracks, and soil plugging was serious, resulting in the failure of the barrel foundation construction. end. It can be seen that how to effectively control and maintain the verticality during the sinking process of barrel foundation is one of the key technologies in the construction process of barrel foundation.

In particular, the configurations of barrel foundations are becoming increasingly diverse. For example, Chinese patent announcement numbers CN205742258U, CN205857222U, CN205444224U, CN204940320U, CN205188994U, CN204626445U, etc. disclose a variety of new barrel-shaped foundation configurations. These designs enrich the functions of the barrel-shaped foundation, but at the same time, to a certain extent, they also increase the number of barrel-shaped foundations. The difficulty of sinking construction. The current various design configurations of barrel foundations give less consideration to the convenience and feasibility of the construction process.

If some auxiliary structures are added to the structure of the barrel foundation to facilitate construction, ensure the verticality of the barrel foundation sinking, and shorten the offshore construction time, the construction difficulty and construction cost of the barrel foundation can be greatly reduced, thereby promoting the barrel foundation Application of fundamentals in engineering. It can be seen that it is necessary to explore the barrel foundation configuration suitable for offshore construction and promote the innovation and progress of the existing barrel foundation construction technology.

References: [1] Zhang Yifei. Case analysis of tubular foundation installation failure[J]. Shipbuilding Technology, 2014, 6:16-19.

Contents of the invention:

In order to make up for the shortcomings of the existing technical problems, the purpose of the present invention is to provide a barrel-shaped foundation, auxiliary components and a construction method that facilitate control of verticality. Three positioning casings are evenly arranged on the barrel-shaped foundation to guide the verticality of the barrel-shaped foundation. It penetrates straight into the seabed to facilitate sinking construction.

The technical solution of the present invention is as follows:

A barrel-shaped foundation and auxiliary components that facilitate control of verticality are characterized in that they include a barrel-shaped foundation, the main body of the barrel-shaped foundation is an inverted barrel, and the inner wall of the barrel is provided with three positioning points evenly distributed along the ring and penetrating the top plate of the barrel The upper end of the casing and barrel is equipped with an inlet and outlet valve connected to the water pumping system;

The auxiliary components include a triangular positioning frame and three positioning steel piles driven vertically into the seabed;

The barrel-shaped foundation is movablely mounted on three positioning steel piles, and the barrel is sunk into the sea to contact the seabed and penetrate to the designed depth.

The barrel-shaped foundation and auxiliary components that facilitate control of verticality are characterized in that three positioning sleeves sandwiching each other at 120° are welded to the inner wall of the barrel, and the upper part of the positioning sleeves is higher than the top plate of the barrel. The lower port of the positioning sleeve is in the shape of a blade pointing toward the barrel wall, and the upper end surface of the barrel is also provided with an inlet and outlet valve connected to the water pumping system.

The barrel-shaped foundation and auxiliary components that facilitate control of verticality are characterized in that the triangular positioning frame is composed of three sleeves welded to each other with steel pipes, and two reinforcing ribs are provided up and down at each welding point. The center distance between each sleeve is equal to the center distance between the three positioning sleeves on the barrel.

The barrel-shaped foundation and auxiliary components that facilitate control of verticality are characterized in that the positioning steel pile is composed of a bottom section of a positioning steel pile and a plurality of standard sections of a positioning steel pile connected and assembled in sequence from bottom to top. The lower end of the bottom section of the steel pile is provided with a tapered pile tip, and the upper end of the positioning steel pile bottom section is provided with a threaded connection hole;

One end of the standard section of the positioning steel pile is equipped with a threaded tenon, and the other end of the standard section of the positioning steel pile is also provided with a threaded connection hole. The threaded tenon and the threaded connection hole match each other. By screwing the threaded tenon of the standard section of the positioning steel pile into the bottom The threaded connection holes of joints or other standard joints realize mutual fixation and connection.

The barrel-shaped foundation and auxiliary components that facilitate control of verticality are characterized in that the inner diameter of the positioning sleeve on the barrel is equal to the inner diameter of the sleeve on the triangular positioning frame, and the inner diameter of both is greater than the outer diameter of the positioning steel pile by 1 ~2cm.

A construction method for barrel-shaped foundations and auxiliary components that facilitates control of verticality, which is characterized by including the following steps:

1). Driving the first positioning steel pile:

According to the design parameters, the threaded tenon is screwed into the threaded connection hole, and the bottom section of a positioning steel pile and the standard sections of multiple positioning steel piles are assembled with each other to form a positioning steel pile. The first positioning steel pile is driven vertically in the designated sea area. Root positioning steel pile;

2) Drive the other two positioning steel piles:

Put a sleeve of the triangular positioning frame around the first positioning steel pile that has been driven, and then drive the other two positioning steel piles into the seabed based on the restrictions and positioning functions of the other two sleeves, and finally drive the three positioning steel piles into the seabed. Parameters such as center distance, plumb degree, and depth of penetration of positioning steel piles meet the design requirements;

3) Insert the barrel-shaped foundation:

Take out the triangular positioning frame from the three positioning steel piles, lift the barrel so that the three positioning sleeves cover the three positioning steel piles and gradually sink. After the positioning steel piles are exposed on the top surface of the barrel, put the triangular positioning frame on the three positioning steel piles. piles, and the barrel slowly sinks into the sea along the positioning steel piles until it touches the seabed;

4) The barrel-shaped foundation penetrates into the seabed:

Open the pumping system connected to the inlet and outlet valve of the barrel to extract negative pressure, so that the barrel penetrates into the seabed along the positioning steel piles to the designed depth under the action of its own weight and negative pressure;

5) Remove some positioning steel piles:

Take out the triangular positioning frame from the three positioning steel piles, and rotate, screw out, and remove the standard sections of the positioning steel piles above the top of the barrel one by one, while leaving the positioning steel piles below the top of the barrel to complete the barrel. Body foundation sinking and penetration construction.

The beneficial effects of the present invention are:

1. The present invention provides three vertical, hollow positioning sleeve holes on the inner wall of the barrel. The size of the positioning sleeve holes is small. This auxiliary structure will not significantly increase the difficulty of making and sinking the barrel-shaped foundation, and is economical. and practicality;

2. The present invention transforms the verticality problem during the sinking process of the barrel-shaped foundation into the verticality problem of the positioning steel piles. As long as the verticality of the three positioning steel piles meets the requirements, the verticality of the barrel-shaped foundation automatically meets the requirements without the need for Subsequent leveling and correction; the verticality of the positioned steel piles is easier to achieve, thus reducing the construction difficulty of the barrel foundation as a whole;

3. After the construction of the barrel foundation of the present invention is completed, the positioning steel piles below the top surface of the barrel foundation continue to be retained, which can continuously position and restrict the barrel foundation to ensure the verticality of the barrel foundation during subsequent use. Obviously good for the project.

Picture description:

Figure 1 is a top view of the barrel-shaped foundation of the present invention.

Figure 2 is a bottom view of the barrel-shaped foundation of the present invention.

Figure 3 is a cross-sectional view of the barrel foundation of the present invention.

Figure 4 is a schematic diagram of positioning steel pile accessories and assembly of the present invention.

Figure 5 is a schematic structural diagram of the triangular positioning frame of the present invention.

Figure 6 is a schematic diagram of the first positioning steel pile constructed according to the present invention.

Figure 7 is a schematic diagram of the completion of construction of three positioning steel piles according to the present invention.

Figure 8 is a schematic diagram of three positioning steel piles inserted into the barrel-shaped foundation of the present invention.

Figure 9 is a schematic diagram of the barrel-shaped foundation penetrating into the seabed according to the present invention.

Figure 10 is a schematic diagram of the barrel-shaped foundation construction completed according to the present invention.

Explanation of reference signs: 1. Barrel; 2. Water inlet and outlet valve; 3. Positioning sleeve; 4. Positioning steel pile bottom section; 5. Conical pile tip; 6. Threaded connection hole; 7. Positioning steel pile standard section ; 8. Threaded tenon; 9. Triangular positioning frame; 10. Sleeve; 11. Reinforced rib; A. Sea level; B. Sea bed surface.

Detailed ways:

See attached picture:

A barrel-shaped foundation and auxiliary components for easy control of verticality, including a barrel 1 and a positioning sleeve 3. Three positioning sleeves 3 are symmetrically and evenly welded on the inner wall of the barrel 1 of the barrel-shaped foundation. The construction is based on triangular positioning. Three vertical positioning steel piles are pre-installed on the frame 9, and then the three positioning casings 3 of the barrel-shaped foundation are placed around the three positioning steel piles and sunk into the sea to contact the seabed. Under the action of the dead weight and the pressure difference between the inside and outside of the barrel, the barrel-shaped foundation is The foundation penetrates into the seabed to the design depth, and the verticality of the barrel foundation can be automatically satisfied during the entire process, thus forming a new barrel foundation that is easy to construct.

Three positioning sleeves 3 are welded symmetrically and evenly on the inner wall of the barrel-shaped foundation barrel 1. The upper part of the positioning sleeve 3 passes through and is higher than the top plate of the barrel-shaped foundation. The lower part of the positioning sleeve 3 is in the shape of a knife edge pointing toward the barrel wall. It facilitates the sinking of the barrel-shaped foundation, as shown in Figures 1 and 2.

The connection lines between the three positioning sleeves 3 on the barrel 1 and the central axis are 120° to each other, as shown in Figure 3: the positioning sleeves 3 are welded and connected to the inner wall of the barrel, and the lower part is blade-shaped, which can reduce the resistance of sinking. Easy to construct. The top of the positioning sleeve 3 is higher than the top plate of the barrel foundation, which has no effect on the sealing property inside the barrel. The three positioning casings 3 are designed to utilize the stability of the triangle to ensure that the overall stability of the subsequent three positioning steel piles meets the construction requirements.

The positioning steel pile is assembled from a positioning steel pile bottom section 4 and a plurality of positioning steel pile standard sections 7. One end of the positioning steel pile bottom section 4 is a cone-shaped pile tip 5, and the other end of the positioning steel pile bottom section 4 is There is a hollow section with a built-in thread 6 inside. One end of the positioning steel pile standard section 7 is a threaded tenon 8. The other end of the positioning steel pile standard section 7 is a hollow section with a built-in thread 6. The threaded tenon 8 and the built-in thread 6 To match each other, mutual fixation and connection can be achieved by screwing the threaded tenons 8 of the standard section 7 of the positioning steel pile into the built-in threads 6 of the bottom section 4 or other standard sections 7, as shown in Figure 4.

Generally, the length of the bottom section 4 of the positioning steel pile is the same as the length of the standard section 7 of the positioning steel pile. The positioning steel pile standard section 7 can be standardized, standardized and large-scale production to meet the needs of different depths under different circumstances. By screwing the threaded tenon 8 and the built-in thread 6 into each other, the positioning steel pile can be extended and continued.

The main function of the positioning steel pile is to guide the barrel-shaped foundation to penetrate vertically into the seabed. During the construction process, the horizontal and vertical loads it receives are small, so its cross-sectional size does not need to be too large, as long as it can maintain the verticality of the barrel-shaped foundation. Just the degree. Although it is called "positioning steel pile", it is actually a "positioning steel rod". Preferably, the outer diameter of the positioning steel pile is 10~25cm.

The triangular positioning frame 9 is made of steel pipes welded to each other between three sleeves 10. Two reinforcing ribs 11 are provided up and down at each welding point. The center distance between each sleeve 10 is equal to the three positioning sleeves on the barrel 1. The center distances between 3 are equal, as shown in Figure 5. The hollow inner diameter of the positioning sleeve 3 on the barrel 1 is equal to the inner diameter of the sleeve 10 on the triangular positioning frame 9. The hollow inner diameter of the positioning sleeve 3 on the barrel 1 is 1~2 cm larger than the outer diameter of the positioning steel pile.

The function of the triangular positioning frame 9 is to accurately locate and limit the positions of the three positioning steel piles, so that the three positioning steel piles can be inserted into the seabed in a vertical state. The distance between the central axes of the three positioning steel piles is the three positioning positions on the barrel 1 The distance between the central axes of casing 3.

In fact, during the construction process, multiple triangular positioning frames 9 can be used as needed to constrain the three positioning steel piles at different positions to ensure the accuracy of the verticality and position of the positioning steel piles. Only if the verticality and spacing of the three positioning steel piles meet the requirements can the verticality of the subsequent barrel-shaped foundation meet the requirements. Positioning steel piles should have sufficient strength and rigidity to maintain the plumb characteristics of the barrel foundation during the construction process.

It can be seen that this technology transforms the verticality requirements of ensuring the barrel-shaped foundation into the verticality requirements of positioning steel piles. With rich experience in the construction of various types of steel piles, the verticality of positioning steel piles is easier to achieve, thereby reducing the difficulty of construction of barrel-shaped foundations. the goal of.

The hollow inner diameter of the positioning casing 3 is 1 to 2 cm larger than the outer diameter of the positioning steel pile, so that the barrel-shaped foundation can be placed on the positioning steel pile and slide into the seabed smoothly. In order to reduce mutual friction, lubricant can even be applied on the inner wall of the positioning sleeve 3 and the outer wall of the positioning steel pile.

A construction method for barrel-shaped foundations and auxiliary components that facilitates control of verticality is described in detail as follows:

1). Driving the first positioning steel pile:

According to the design parameters, the threaded tenon 8 is screwed into the built-in thread 6, and the bottom section 4 of one positioning steel pile and the standard sections 7 of multiple positioning steel piles are assembled with each other to form a positioning steel pile. Drive the first positioning steel pile vertically in the sea area designated by the design, as shown in Figure 6.

Parameters such as the plumbness and depth of the positioning steel piles meet the design requirements. Generally, the penetration depth of positioning steel piles should be greater than the penetration depth of barrel foundation.

2) Drive the other two positioning steel piles:

Put a sleeve 10 of the triangular positioning frame 9 around the first positioning steel pile that has been driven, and then drive the other two positioning steel piles into the seabed based on the restriction and positioning functions of the other two sleeves 10. Finally, the center distance, plumb degree, soil penetration depth and other parameters of the three positioning steel piles met the design requirements, as shown in Figure 7.

The sinking posture of the barrel-shaped foundation relies on the guidance and restraint of the positioning steel piles. Therefore, the positioning steel piles should be able to resist various loads during the construction process without lateral movement and tilt. The strength of each component should be able to withstand the combination under complex working conditions. No buckling or deformation occurs under the action of load, and the plumb state can still be maintained.

3) Insert the barrel-shaped foundation:

Take out the triangular positioning frame 9 from the three positioning steel piles, lift the barrel-shaped foundation so that the three positioning sleeves 3 cover the three positioning steel piles and gradually sink. After the positioning steel piles expose the top surface of the barrel-shaped foundation, lift the triangular positioning frame 9 It is placed on three positioning steel piles, and the barrel-shaped foundation is slowly sunk into the sea along the positioning steel piles until it touches the seabed, as shown in Figure 8.

The purpose of promptly covering the three positioning steel piles with the triangular positioning frame 9 is to maintain the verticality of the positioning steel piles. When the three positioning steel piles are assembled together, the overall rigidity is greater and to prevent individual positioning steel piles from being tilted due to local loads during the process.

4) The barrel-shaped foundation penetrates into the seabed:

Open the pumping system connected to the inlet and outlet valve 2 of the barrel foundation to extract negative pressure, so that the barrel foundation penetrates into the seabed along the positioning steel piles to the design depth under the action of its own weight and negative pressure, as shown in Figure 9.

When the verticality of the three positioning steel piles meets the requirements, the barrel-shaped foundation penetrates into the seabed along the three positioning steel piles, and its verticality automatically meets the requirements. There is no need for leveling and repeated checks during the construction process. The construction process is greatly simplified, the construction difficulty is greatly reduced, the offshore operation time is shortened, and the construction cost is reduced.

5) Remove some positioning steel piles:

Take out the triangular positioning frame 9 from the three positioning steel piles, and rotate, screw out and remove the positioning steel pile standard sections 7 above the top surface of the barrel foundation one by one, while leaving the positioning steel piles below the top surface of the barrel foundation still retained. , thereby completing the sinking construction of the barrel-shaped foundation, as shown in Figure 10.

After the barrel foundation is sunk and in place, the positioning steel piles that are higher than the top surface of the barrel foundation will affect subsequent construction and also affect the waterway in the area, so they need to be removed. During the design process of the positioning steel piles, subsequent lifting, If necessary, remove the standard section 7 of the positioning steel pile by screwing out the built-in thread 6 in the opposite direction through the threaded tenon 8. However, the positioning steel piles below the top surface of the barrel foundation do not need to be removed. It will not affect subsequent construction, and retaining this section is beneficial to maintaining the verticality of the barrel foundation during subsequent work.

The present invention sets three vertical positioning sleeves on the inner wall of the barrel. The size of the positioning sleeves is small. This auxiliary structure does not significantly increase the difficulty of making and sinking the barrel foundation, and is economical and practical; The verticality problem during the penetration process of the barrel foundation is transformed into the verticality problem of the positioning steel piles. As long as the verticality of the three positioning steel piles meets the requirements, the verticality of the barrel foundation automatically meets the requirements without subsequent leveling. And correction; the verticality of positioning steel piles is easier to achieve, thus reducing the construction difficulty of barrel foundation as a whole.

The present invention is not limited to the above-mentioned specific embodiments. According to the above content, according to the common technical knowledge and common means in the field, without departing from the above-mentioned basic technical ideas of the present invention, the present invention can also make other equivalent forms. Modifications, replacements or changes all fall within the protection scope of the present invention.

Claims (2)

1. An offshore wind turbine foundation that facilitates control of verticality, including a barrel-shaped foundation and auxiliary components, characterized in that the barrel-shaped foundation main body is an inverted barrel, and the inner wall of the barrel is provided with three evenly distributed along the annular shape. , a positioning casing that penetrates the top plate of the barrel, and the upper end of the barrel is provided with an inlet and outlet valve connected to the water pumping system; the auxiliary components include a triangular positioning frame and three positioning steel piles driven vertically into the seabed using it; The barrel-shaped foundation is movablely mounted on three positioning steel piles, and the barrel is sunk into the sea to contact the seabed and penetrate to the designed depth; The inner wall of the barrel is welded with three positioning sleeves sandwiching each other at 120°. The upper part of the positioning sleeve is higher than the top plate of the barrel. The lower port of the positioning sleeve is in the shape of a blade pointing toward the barrel wall. The upper end surface of the barrel is also Equipped with water inlet and outlet valves connected to the water pumping system; The triangular positioning frame is composed of three sleeves welded to each other with steel pipes. Two reinforcing ribs are provided up and down at each welding point. The center distance between each sleeve is equal to the distance between the three positioning sleeves on the barrel. The distance between the centers is equal; The positioning steel pile is composed of a positioning steel pile bottom section and multiple positioning steel pile standard sections connected and assembled in sequence from bottom to top. The lower end of the positioning steel pile bottom section is provided with a tapered pile tip, and the upper end of the positioning steel pile bottom section is provided with a conical pile tip. There are threaded connection holes; one end of the standard section of the positioning steel pile is equipped with a threaded tenon, and the other end of the standard section of the positioning steel pile is also provided with a threaded connection hole. The threaded tenon and the threaded connection hole match each other. By tightening the thread of the standard section of the positioning steel pile The tenons are screwed into the threaded connection holes of the bottom section or other standard sections to achieve mutual fixation and connection; The inner diameter of the positioning sleeve on the barrel is equal to the inner diameter of the sleeve on the triangular positioning frame, and the inner diameters of both are 1 to 2 cm larger than the outer diameter of the positioning steel pile. 2. A construction method for offshore wind turbine foundations that facilitates control of verticality according to claim 1, characterized in that it includes the following steps: 1) Driving the first positioning steel pile: According to the design parameters, screw the threaded tenon into the threaded connection hole, and assemble the bottom section of one positioning steel pile and the standard sections of multiple positioning steel piles to form a positioning steel pile. Drive the first positioning steel pile vertically in the sea area designated by the design; 2) Driving the other two positioning steel piles: Put a sleeve of the triangular positioning frame on the first positioning steel pile that has been driven, and then drive the other two positioning steel piles based on the other two sleeves. The restriction and positioning functions are driven into the seabed, so that the center distance, plumbness and penetration depth of the three positioning steel piles finally meet the design requirements; 3) Insert the barrel-shaped foundation: Take out the triangular positioning frame from the three positioning steel piles, lift the barrel so that the three positioning casings cover the three positioning steel piles and gradually sink, and then the positioning steel piles are exposed on the top surface of the barrel, and then Place the triangular positioning frame on the three positioning steel piles, and slowly sink the barrel into the sea along the positioning steel piles until it touches the seabed; 4) Penetrating the barrel-shaped foundation into the seabed: Open the pumping system connected to the inlet and outlet valve of the barrel to extract negative pressure, so that the barrel penetrates into the seabed along the positioning steel piles to the design depth under the action of its own weight and negative pressure; 5) Remove some of the positioning steel piles: Take out the triangular positioning frames from the three positioning steel piles, and rotate, unscrew and remove the standard sections of the positioning steel piles above the top of the barrel one by one, and make them below the top of the barrel. The positioning steel piles will continue to be retained to complete the sinking and penetration construction of the barrel foundation.