RU199890U1 - Device for fastening pipe steel piles in the support base of offshore hydraulic structures - Google Patents

Abstract

The utility model relates to the construction of offshore structures, namely, to the technology of fastening steel pipe piles in the support base of offshore hydraulic structures (platforms). The technical result of the device for fastening steel pipe piles in the support base of offshore hydraulic structures is to increase the reliability of the fastening of piles in the guide sleeves of the support bases due to the use of a device equipped with rolling rollers, a drive mechanism and a feed mechanism that ensure uniform plastic deformation of the pile material along the entire circumference of the circular groove in the guide sleeve with a geometry corresponding to the profile of the rolling rollers and the presence of a cylindrical area of contact between the outer surface of the pile wall and the inner surface circular groove of the guide sleeve, which increases the strength of the joint in the axial direction.

Description

The utility model relates to the construction of offshore structures, namely, to the technology of fastening pipe steel piles in the support foundation of offshore hydraulic structures (platforms).

There is a known method of fastening steel pipe piles in the support base of stationary offshore hydraulic structures (platforms), as well as a device for its implementation under the patent for invention RU 2689471 dated 01.08.2018 (published on 28.05.2019), which provides for the use of a device equipped with hydraulic jacks, providing unclamping of the pile in the area of location of the inner circular grooves of the guide sleeves.

The main disadvantage is that this device implements a local effect on the inner wall of the pile during fastening in the guide sleeves of the support base of the offshore stationary platform and does not ensure uniform distribution of the pipe along the entire circumference, which reduces the reliability of fastening.

The objective of the declared useful model is to create a device that provides fastening of pipe piles in the support base of offshore hydraulic structures with the elimination of the above disadvantages. The technical result of the claimed utility model is to increase the reliability of pile fastening in the guide sleeves of the support base due to the use of a device equipped with rolling rollers, a drive mechanism and a feed mechanism that ensure uniform plastic deformation of the pile material along the entire circumference of the circular groove in the guide sleeve with a geometry corresponding to the profile of the rolling rollers, and the presence of a cylindrical section of contact of the outer surface of the pile wall with the inner surface of the circular groove of the guide sleeve, which increases the strength of the joint in the axial direction.

The technical result is achieved by fixing pipe piles in the support base of stationary offshore structures, in which the support base of the offshore structure is installed on the seabed, the pipe piles are driven through the guide sleeves of the support base into the seabed, the device equipped with rolling rollers is lowered into the pile so that the rolling rollers were located symmetrically with respect to the horizontal plane passing through the middle of the inner circular groove of the guide sleeve, and the keys located on the supporting base of the device coincided with the keyways made on the end of the pile, which excludes the possibility of turning the device during operation; by means of the drive, the rollers are given a rotational movement relative to the pile axis, pressure is created in the hydraulic system of the hydraulic cylinder, while the hydraulic cylinder rods impart radial movement to the rolling rollers with respect to the pile axis, while the rollers press on the inner surface of the pile until the pressure reaches a value at which the stress in the pipe body the pile reaches the yield point of the pile material, thus the combination of two movements - rotational and translational - ensures uniform plastic deformation of the pile material along the entire circumference of the circular groove in the guide sleeve with a geometry corresponding to the profile of the rolling rollers, while the gap in the vertical plane between the rollers ensures the formation of a cylindrical the area of contact of the outer surface of the pile wall with the inner surface of the circular groove of the guide sleeve, while control over the process of unclamping the pile material is carried out by changing the pressure in the hydraulic system of the hydraulic cylinder the core and the magnitude of the torque, at the end of the deformation process, the rods together with the rollers return to their original position, the device is lifted.

In this case, the fixation against axial rotation of the device during operation can be provided with a device of another type, for example, a hydraulic cylinder with one or more rods equipped with linings in the form of a cylindrical sector corresponding to the geometry of the inner wall of the pile, or a block of hydraulic cylinders with similar linings.

In this case, the hydraulic cylinder contains at least two rods that can move in radial directions with respect to the axis of the pile, imparting radial movement to the rolling rollers.

In this case, the working body of the device contains at least two blocks of rolling rollers.

In this case, a spring or hydraulic return of the rod to its original position is used.

In addition, the hydraulic cylinder can be replaced with a device of a different type (for example, mechanical) that tells the rollers the required amount of axial displacement with a force sufficient for the pressure to reach a value at which the stress in the pipe pile body reaches the yield point of the pile material.

In this case, the fastening of the hydraulic cylinder, or a similar device, is carried out by means of flanges or seat nests directly to the device body or an bracket fixed to the device body. In this case, the working body of the device has the ability to axially move relative to the axis of the pile when fastening the pile in several sequentially located internal circular grooves of the guide sleeve with the possibility of fixing in positions when the rolling rollers are located symmetrically relative to the horizontal plane passing through the middle of the inner circular groove of the guide sleeve.

In this case, there is a mechanism that imparts a rotational movement to the rollers relative to the pile axis.

The device may also include a hydraulic and / or power station, included in the hydroelectric power supply system, devices equipped with remote control.

The essence of the proposed method is illustrated by drawings:

fig. 1 is a diagram of a device equipped with rolling rollers, a drive mechanism and a feed mechanism that secures the pile in the inner circular grooves of the guide sleeves; fig. 2 is a diagram of a device with a locking mechanism against axial rotation in the form of four hydraulic cylinders with rods equipped with linings in the form of a spherical sector corresponding to the geometry of the inner wall of the pile,

Where

1 - steel pipe pile;

2 - guide sleeve;

3 - splined shaft;

4 - key;

5 - rolling roller;

6 - drive mechanism;

7 - hydraulic cylinder;

8 - hydraulic cylinder rod;

9 - plug;

10 - axis;

11 - bearing;

12 - split retaining ring;

13 - hydraulic cylinder of the locking mechanism;

14 - rod pad.

The method of fastening pipe steel piles in the support base of stationary offshore structures (platforms) using devices equipped with rolling rollers, a drive mechanism and a feed mechanism includes the following operations:

1. Facing the steel pipe pile (1) driven through the guide sleeves (2) of the installed support base of the structure on the seabed to the required size.

2. Making two keyways on the upper end of the pile (1).

3. Axial fixation of the splined shaft (3) in the working position with the transport (horizontal) arrangement of the device.

4. Lowering the device into the pile (1) until the base plane of the device contacts the end of the pile (1) and fixing the device by means of keys (4) in the end keyways. The preliminary fixation of the shaft in the working position ensures the arrangement of the rolling rollers (5) symmetrically relative to the horizontal plane passing through the middle of the inner circular groove of the guide sleeve (2).

5. Transmission of torque from the drive mechanism (6), consisting, for example, of a hydraulic motor-reducer and a gear train, to the splined shaft (3).

6. Building up pressure in the hydraulic cylinder system (7). In this case, the rods (8) of the hydraulic cylinder (7) through the forks (9) press on the axles (10), on which the rollers (5) are fixed on the bearings (11), moving them radially with respect to the axis of the pile (1).

7. When the pressure reaches the value at which the stress in the pile body (1) reaches the yield point of the pile material, plastic deformation (expansion) of the pile body (1) begins into the inner circular groove of the guide sleeve (2). Control over the process of unclamping (plastic deformation) of the pile material (1) is carried out by means of a device that analyzes data from the pressure sensors of the hydraulic cylinder (7) and the magnitude of the torque. A sharp increase in the indicators indicates that the outer surface of the pile (1) came into contact with the inner surface of the circular groove of the guide sleeve (2). The process of unclamping the pile (2) is over.

8. The rods (8) together with the rolling rollers (5) are returned to the transport position using the hydraulic system (or other return mechanism, for example, a spring).

9. Removing the split retaining ring (12).

10. Moving the working body of the device to the next working position. Fixation of the splined shaft (3) in working position by means of a split circlip (12). Unclenching the pile (1) into the inner circular groove of the guide sleeve (2) according to paragraphs. 5-8.

11. The device is being lifted. The process of fixing the pile (1) in the guide sleeve (2) of the support base is completed.

For a better understanding of the proposed utility model and to demonstrate the possibility of using various options for the fixation mechanism from the axial rotation of the device relative to the pile axis, Fig. 2 is presented. According to the shown figure, the keys 4 can be replaced by an alternative locking mechanism against axial rotation of the device relative to the axis of the pile, consisting of hydraulic cylinders 13, the rods 14 of which are equipped with linings in the form of a cylindrical sector corresponding to the geometry of the inner wall of the pile. This mechanism can be used in the case when it is not possible to make keyways on the end of the pile.

Claims (2)

1. A device for fastening pipe steel piles in the support base of offshore hydraulic structures, containing a drive mechanism consisting of a hydraulic motor-reducer and a gear transmission, transmitting torque to the splined shaft, a hydraulic cylinder attached to the body of the device containing two rods that can move in the radial direction with respect to the pile axis and press through the forks on the axes on which the rolling rollers are fixed on the bearings, moving them in the radial direction, while the working body of the device is designed to move relative to the pile axis with the possibility of fixing the splined shaft using a split retaining ring, and the rollers have the ability to receive a rotary motion through the drive. 2. The device according to claim 1, characterized in that the hydraulic cylinder is attached to the body of the device by means of flanges or seats.