CN114482114A - A kind of screw pile-tube composite foundation structure based on fixed bracket and its construction method - Google Patents

Abstract

The invention discloses a helical pile-cylinder composite foundation structure based on a fixed bracket and a construction method thereof. The foundation structure includes a cylindrical foundation and a spiral pile, and adopts a plurality of fixed triangular brackets to cooperate with a large bearing structure to carry out the auxiliary force for the sinking of the spiral pile. The transmission, the force transmission effect is good. Multiple fixed triangular brackets can evenly transmit the auxiliary subsidence load provided by the screw piles to the top cover of the cylindrical foundation, avoiding the structural damage caused by the concentration of force on the top cover during the subsidence process. The vertical load is transmitted to the cylindrical foundation, but the rotational torque may not be transmitted to the cylindrical foundation; after the sinking is completed, the top cover, fixed bracket, bearing and sleeve of the cylindrical foundation can be integrated to further improve the bearing capacity of the foundation structure. . In addition, the above-mentioned structural form is simple, and each component is easy to manufacture, and has a good application prospect.

Description

A kind of screw pile-tube composite foundation structure based on fixed bracket and its construction method

technical field

The invention belongs to the technical field of offshore wind power, and in particular relates to a screw pile-tube composite foundation structure based on a fixed bracket and a construction method thereof.

Background technique

The development potential of offshore wind power in the eastern coastal areas of my country exceeds 200 million kilowatts, and the wind power energy reserves are very rich. Offshore wind power has the advantages of low turbulence, excellent wind resources, no occupation of arable land, and proximity to developed coastal areas in my country. In recent years, with the continuous improvement of the relevant policies of "carbon neutrality" and "carbon peaking" in various fields and the continuous maturity of offshore wind power technology, China's offshore wind power will usher in a new round of development boom, and it will gradually change from offshore to small Capacity-large cost is developing rapidly in the direction of deep sea-large capacity-low cost.

The tubular infrastructure is one of the infrastructure forms that has developed rapidly in the offshore wind power field in recent years. The cylindrical foundation is a wide and shallow foundation structure with a large area. After sinking, the soil in the cylinder can be effectively used, and it has good anti-overturning ability, which is very suitable for large-capacity offshore wind power with large horizontal loads. The tubular structure usually adopts air flotation towing and negative pressure sinking to complete the construction and installation, and the offshore operation period is short. However, for the environment with shallow water depth, the negative pressure extracted from the cylinder during the sinking process may not be able to meet the negative pressure requirements of the sinking, resulting in the failure of the sinking installation. Therefore, many scholars and engineering experts consider using suitable devices for auxiliary subsidence of cylindrical foundations. Recently, a screw pile-cylinder composite foundation structure combining screw piles and cylindrical foundations has been proposed, which utilizes the advantage of the controllable subsidence of the rotating screw piles to assist the sinking of the cylindrical foundation, so as to ensure that the cylindrical foundation is under the condition of under-negative pressure. The sinking operation can also be completed, which effectively reduces the installation risk. In addition, the screw piles further enhance the pullout resistance and compressive resistance of the overall structure due to the spiral blades embedded in the soil, and improve the bearing capacity.

However, there are certain technical difficulties in the current design scheme of the screw pile-tube composite foundation structure: the screw pile rotates through the overlying torque device to screw the pile body into the soil. The vertical force of the sink is evenly transmitted to the top cover of the cylindrical foundation, and the rotational torque is not transmitted to the cylindrical foundation. However, in most of the current designs, the contact area between the pile body and the cylinder body is small, the force transmission effect is not good, and there is a risk of local force damage; During the subsidence process, the cylindrical foundation also rotates with the screw pile. Obviously, the above-mentioned design defects make it difficult to popularize and apply the helical pile-tube composite foundation structure.

Therefore, the present invention proposes a screw pile-cylinder composite foundation structure based on a fixed bracket, which has good force transmission characteristics, and only transmits vertical force but not horizontal force, which greatly improves the performance of the screw pile-cylinder composite foundation structure. Actual applicable performance.

SUMMARY OF THE INVENTION

The purpose of this application is to propose a screw pile-cylinder composite foundation structure using fixed brackets for sinking force transmission and a construction method thereof. The shape of the foundation is stressed to ensure the safety of the structure.

The present invention is achieved through the following technical solutions:

A helical pile-cylinder composite foundation structure based on a fixed bracket, comprising a cylindrical foundation and a helical pile;

The cylinder-shaped foundation includes a cylinder wall, a cylinder top cover, a subdivision plate, a sleeve, a bearing and a fixed bracket; the cylinder top cover is connected to the upper end edge of the cylinder wall, the subdivision plate is arranged inside the cylinder wall, and the cylinder top cover is arranged on the inside of the cylinder wall. A through hole is formed in the center, the sleeve is arranged above the through hole, the bearing is arranged above the sleeve, and the fixing bracket is evenly arranged on the upper surface of the cylinder top cover in a radial shape and is fixedly connected with the bearing, the sleeve and the cylinder top cover;

The screw piles are arranged through the through holes of the bearing, the sleeve and the cylinder top cover, and the screw piles are rotatably connected to the bearing through a protruding ring on the pile wall.

In the above technical solution, the material of the cylinder wall is reinforced concrete or steel, the diameter is 30-40 m, and the height is 5-15 m.

In the above technical solution, the material of the cylinder top cover is reinforced concrete or steel.

In the above technical solution, the sub-division panels are arranged in a honeycomb shape.

In the above technical solution, the number of the fixing brackets is 4-8.

A construction method of a screw pile-cylinder composite foundation structure based on a fixed bracket is as follows:

The composite foundation structure is sunk at the target site, and the screw pile is rotated and sunk by the top torque equipment. During the sinking process, its auxiliary sinking force is transmitted to each fixed bracket through the bearing, and then evenly transmitted to the top cover of the cylinder through the fixed bracket. After being in place, the screw pile is locked with the bearing and the sleeve, which together become the bearing structure.

Compared with the prior art, the advantages of the present invention are:

The invention discloses a screw pile-tube composite foundation structure based on a fixed bracket and a construction method thereof. The foundation structure adopts a plurality of fixed triangle brackets and a large bearing structure to transmit the auxiliary force of the spiral pile sinking, and the force transmission effect is good. Multiple fixed triangular brackets can evenly transmit the auxiliary subsidence load provided by the screw piles to the top cover of the cylindrical foundation, avoiding the structural damage caused by the concentration of force on the top cover during the subsidence process. The vertical load is transmitted to the cylindrical foundation, but the rotational torque may not be transmitted to the cylindrical foundation; after the sinking is completed, the top cover, fixed bracket, bearing and sleeve of the cylindrical foundation can be integrated to further improve the bearing capacity of the foundation structure. . In addition, the above-mentioned structural form is simple, and each component is easy to manufacture, and has a good application prospect.

Description of drawings

Fig. 1 is a kind of top-view structural schematic diagram of a screw pile-cylinder composite foundation structure based on a fixed bracket;

Fig. 2 is a kind of bottom-view structural schematic diagram of a screw pile-cylinder composite foundation structure based on a fixed bracket;

FIG. 3 is a schematic diagram of an exploded structure of a screw pile-cylinder composite foundation structure based on a fixed bracket.

In the figure: 1. Cylinder wall; 2. Spiral pile; 2-1. Raised ring; 3. Bearing; 4. Sleeve; 5. Fixed bracket; 6. Cylinder top cover;

For those of ordinary skill in the art, other related drawings can be obtained from the above drawings without any creative effort.

Detailed ways

The technical solutions of the present invention are further described below in conjunction with specific embodiments.

Example

A screw pile-cylinder composite basic structure based on a fixed bracket is composed of a cylinder wall 1 , a screw pile 2 , a bearing 3 , a sleeve 4 , a fixed bracket 5 , a cylinder top cover 6 , and a sub-division board 7 . Among them, the cylinder wall 1 is a reinforced concrete structure or a steel structure, the diameter and height are adjusted according to the actual project requirements, the diameter is generally 30-40m, and the height is generally 5-15m; Reinforced concrete structure, the diameter is the same as the diameter of the cylinder wall 1; a sleeve 4 is set in the middle of the cylinder top cover 6, the sleeve 4 is fixedly connected with the cylinder top cover 6, and the inner diameter is slightly smaller than the diameter of the screw pile 2; the screw pile 2 is inserted into the sleeve 4 , the diameter of the screw pile 2 is determined according to the specific engineering requirements, the screw pile 2 is provided with a ledge 2-1 on the pile wall, the screw pile 2 is installed in the bearing 3 through the ledge 2-1, and the screw pile 2 can rotate inside the sleeve 4 , and transmit the vertical load through the bearing 3; the bearing 3 is externally connected to the fixed bracket 5, the fixed bracket 5 is a steel structure tripod, 4 to 8 sets are evenly distributed in the 2 circles of the spiral pile, and the top of the fixed bracket 5 is fixedly connected with the bearing 3 , the lower part is fixedly connected with the top cover 6 of the cylinder.

During the sinking process, the screw pile 2 is rotated and sunk by the top torque equipment. During the sinking process, its auxiliary sinking force is transmitted to each fixed bracket 5 through the bearing 3, and then evenly transmitted to the cylinder top cover 6 through the fixed bracket 5 to ensure During the sinking process of the cylinder top cover 6, the force is uniform. After settling in place, the screw pile 2 is locked with the bearing 3 and the sleeve 4 to form a bearing structure together.

The present invention has been exemplarily described above. It should be noted that, without departing from the core of the present invention, any simple deformations, modifications or other equivalent replacements that those skilled in the art can do without creative effort fall into the scope of the present invention. the scope of protection of the invention.

Claims (6)

1. A screw pile-barrel composite foundation structure based on a fixed support is characterized in that: comprises a cylindrical foundation and a spiral pile;

the cylindrical foundation comprises a cylinder wall, a cylinder top cover, a subdivision plate, a sleeve, a bearing and a fixed support; the cylinder top cover is connected to the upper end edge of the cylinder wall, the compartment plate is arranged in the cylinder wall, a through hole is formed in the center of the cylinder top cover, the sleeve is arranged above the through hole, the bearing is arranged above the sleeve, and the fixed support is radially and uniformly arranged on the upper surface of the cylinder top cover and is fixedly connected with the bearing, the sleeve and the cylinder top cover;

the spiral pile penetrates through the through holes of the bearing, the sleeve and the cylinder top cover, and is rotatably connected with the bearing through a protruding ring on the pile wall.

2. A screw pile-tube composite foundation structure based on a fixing bracket according to claim 1, characterized in that: the cylinder wall is made of reinforced concrete or steel, the diameter of the cylinder wall is 30-40 m, and the height of the cylinder wall is 5-15 m.

3. A screw pile-tube composite foundation structure based on a fixing bracket according to claim 1, characterized in that: the top cover of the barrel is made of reinforced concrete or steel.

4. A screw pile-tube composite foundation structure based on a fixing bracket according to claim 1, characterized in that: the cabin separation plates are arranged in a honeycomb shape.

5. A screw pile-tube composite foundation structure based on a fixing bracket according to claim 1, characterized in that: the number of the fixed supports is 4-8.

6. A construction method of a spiral pile-cylinder composite foundation structure based on a fixed support is characterized by comprising the following steps:

the composite foundation structure sinks at a target place, the spiral pile sinks by the rotation of the top torque device, the auxiliary sinking force of the spiral pile is transmitted to each fixing support through the bearing in the sinking process, then the auxiliary sinking force is transmitted to the barrel top cover through the fixing supports, and after the spiral pile is sunk in place, the spiral pile is locked with the bearing and the barrel, and the spiral pile and the bearing and the barrel are of a bearing structure.

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