CN113174948A

CN113174948A - Large split type replacing pile driver for underwater pile driving operation

Info

Publication number: CN113174948A
Application number: CN202110371556.1A
Authority: CN
Inventors: 訚耀保; 喻展祥
Original assignee: Tongji University
Current assignee: Tongji University
Priority date: 2021-04-07
Filing date: 2021-04-07
Publication date: 2021-07-27
Anticipated expiration: 2041-04-07
Also published as: CN113174948B

Abstract

The invention relates to a large split type secondary driving device for underwater pile driving operation, which comprises a first secondary driving device and a second secondary driving device which are formed by combining an upper part and a lower part, wherein the first secondary driving device is integrally in a cylindrical frustum shape, the bottom surface of the first secondary driving device is provided with an annular hollow groove, a central stress column positioned in the center of the bottom surface is formed by the annular hollow groove, the second secondary driving device is in a hollow cylindrical frustum structure, the annular upper end surface of the second secondary driving device is in contact with the lower end surface of the first secondary driving device, and the annular lower end surface of the second secondary driving device is respectively and uniformly provided with a plurality of gas circulation grooves along the circumference.

Description

Large split type replacing pile driver for underwater pile driving operation

Technical Field

The invention relates to a technology of parts of a hydraulic hammer pile driving system in the field of engineering machinery, in particular to a large split type replacing pile for underwater pile driving operation.

Background

In recent years, with the increase of social demands on the construction of large-scale infrastructures such as high-rise buildings, sea-crossing bridges, offshore wind power and the like, the pile foundation industry is facing high-speed modern development. Taking offshore wind power engineering as an example, the maximum pile diameter of a single pile used for constructing a wind turbine foundation platform at present reaches 6.5 meters, the design depth of the pile exceeds 150 meters at the deepest, and when a large pile foundation is driven to the design depth, a large hydraulic pile hammer is usually required to be used for hammering for ten thousand times, so that the pile driving system is required to have high enough reliability.

Nowadays, the maximum pile driving energy of the hydraulic pile driving hammer can be 4000KJ, and in a hydraulic pile driving system, a transmission device for driving the pile driving energy has the function of protecting a pile head, is also one of devices causing the largest energy loss in the pile sinking process, and is easy to damage because the transmission device is used as an anti-striking component. Most of the existing replacement beats designed and produced in China are small cylindrical replacement beats, the design and production experience of large replacement beat parts is lacked, and the transportation of the large replacement beat parts is a difficult problem to be solved urgently.

Chinese patent CN110241732A discloses a replacement device without replacing pile cap, which is realized by adding an adjusting sleeve to match pile foundations of different sizes, but is limited by the structure of the adjusting sleeve, and the replacement body can only be designed into a 'convex' structure, which cannot satisfy the current construction of large pile foundations.

Chinese patent CN209941679U discloses a take-over device with deflector and spacing strip, its structure makes processing more convenient, can also lighten the gross weight simultaneously, alleviates and hangs heavy load, but also only is applicable to the construction of minor diameter pile foundation, then still can face difficult processing and difficult transportation scheduling problem to large-scale pile foundation.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a large split type secondary pile for underwater pile driving operation.

The purpose of the invention can be realized by the following technical scheme:

the utility model provides an underwater pile driving operation is with large-scale split type instead dozen, includes that the fashioned first of upper and lower combination is instead dozen and the second is instead dozen, first instead dozen whole be cylindrical frustum type, annular fretwork groove has been seted up to its bottom surface, form the central authorities stress column that is located bottom surface center department through annular fretwork groove, the second instead beat for hollow cylindrical frustum type structure, the lower terminal surface contact of its annular up end and first instead dozen, and a plurality of gas circulation grooves are evenly seted up respectively along the circumference to its annular lower terminal surface.

The second secondary tap is internally provided with an upper cylindrical cavity and a lower conical cavity which are communicated.

The upper cylindrical cavity is communicated with the space of the annular hollow groove, and the lower conical frustum-shaped cavity is communicated with the outside through a plurality of gas circulation grooves.

The inner diameter of the upper end face of the second replacing punch is smaller than the outer diameter of the annular hollow groove at the bottom of the first replacing punch.

The outer diameter of the upper end face of the second pad is larger than the maximum outer edge diameter of the first pad.

The maximum outer edge diameter of the second replacement pile is 6.65m, and the diameter of a pile body suitable for the large split type replacement pile is 4.5-6.5 m.

The first and second tie bars are forged by alloy structural steel, the yield strength limit is greater than 800MPa, and the upper limit of applicable piling energy is 3500-4000 KJ.

The depth D of the annular hollow groove₃Not exceeding the first thickness D₁0.15 times of.

The gas circulation groove is a straight groove with a depth D₅No more than 30mm, no more than 100mm in width, and no more than 8 in number.

The cross section of the annular hollow groove is in a semi-water-drop shape, and the outer edge of the annular hollow groove is smoothly connected with the lower end face of the second displacement.

Compared with the prior art, the invention has the following advantages:

the invention creatively designs the split type structure, so that the replacing component with the same size has smaller weight, is easier to design and process, and simultaneously solves the transportation problem of the ultra-large replacing component. In addition, the replacing piling is also provided with structures such as a central stress column, an annular hollow groove and a gas circulation groove, so that the service life of a replacing piling part can be prolonged, the loss of piling energy on the replacing piling can be reduced, and the underwater piling operation can be realized.

Drawings

Fig. 1 is a schematic view of the main structure of the present invention.

Fig. 2 is a half-section structural view of the first rotary beater.

Fig. 3 is a half-sectional structural view of a second rotary beater.

Fig. 4 is a schematic bottom structure diagram of a second alternative dozen.

Fig. 5 is a cloud of first impact simulation stress for a drop-in (top).

Fig. 6 is a cloud of first impact simulation stresses.

Fig. 7 is a cloud of second impact simulation stresses.

Fig. 8 is a cloud of second stick (bottom) impact simulation stresses.

The notation in the figure is:

1. the device comprises a first replacing bar, a second replacing bar, a third replacing bar, a circular hollow groove, a fourth replacing bar, a central stress column, a fourth replacing bar, an annular hollow groove, a fourth replacing bar, a central stress column, a gas circulation groove, a central stress column, a gas circulation groove, and a gas circulation groove.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

Examples

As shown in figure 1, the invention provides a large split type secondary ramming for underwater piling operation, which consists of a first secondary ramming part (1) and a second secondary ramming part (2).

As shown in figure 2, the whole first secondary driving (1) is in a cylindrical frustum shape, the bottom of the first secondary driving (1) is provided with a central stress column (4) and an annular hollow groove (3), the initial thickness of the secondary driving center is reserved for the central stress column (4), and the problems of breakage and the like can be avoided in the driving process. The annular hollow groove (3) is used for enabling the piling energy to be transmitted downwards from the outer edge of the first secondary piling (1) more, and energy loss is reduced.

Fig. 3 is a half-section structural diagram of a second secondary rapping device (2), fig. 4 is a bottom structural diagram of the second secondary rapping device (2), and as shown in fig. 3 and 4, the second secondary rapping device (2) is a hollow cylindrical frustum structure, and a plurality of gas circulation grooves (5) are arranged at the bottom of the second secondary rapping device. The hollow annular structure can effectively reduce the weight of the replacing component and reduce energy loss, and gas in the pile is discharged out of the pile through the gas circulation groove (5), so that underwater pile driving operation can be realized.

Fig. 5 is a cloud chart of a first impact simulation stress of a secondary dozen (top), fig. 6 is a cloud chart of a first impact simulation stress of a secondary dozen (bottom), fig. 7 is a cloud chart of a second impact simulation stress of a secondary dozen (top), and fig. 8 is a cloud chart of a second impact simulation stress of a secondary dozen (bottom), as shown in fig. 5-8, under the impact force of 300MN, the maximum stress generated inside the primary dozen is 346.84MPa, the maximum stress generated inside the secondary dozen is 455.89MPa, which are both far below the strength limit of the structure of 800MPa, the safety factor is 1.75-2.31, and no obvious stress concentration phenomenon occurs, which indicates that the large split secondary dozen has sufficient safety and reliability.

The previous description of the disclosed embodiments is provided to facilitate the understanding and application of the present invention by those skilled in the art. It will be readily apparent to those skilled in the art that appropriate modifications can be made to the embodiments in combination with the practical application scenarios and the generic principles described herein can be applied to other embodiments without the use of any inventive faculty. Therefore, the present invention is not limited to the embodiments described herein, and those skilled in the art should make improvements and modifications to the present invention based on the disclosure of the present invention within the protection scope of the present invention.

Claims

1. The utility model provides an underwater pile driving operation is with large-scale split type instead dozen, its characterized in that, including upper and lower combination forming's first instead dozen (1) and second instead dozen (2), first instead dozen (1) whole be cylinder frustum type, annular fretwork groove (3) have been seted up to its bottom surface, form central stress column (4) that are located bottom surface center department through annular fretwork groove (3), second instead dozen (2) be hollow cylinder frustum type structure, the annular up end of its circle contacts with the lower terminal surface of first instead dozen (1), and a plurality of gas circulation grooves (5) are evenly seted up respectively along the circumference to the annular lower terminal surface of its circle.

2. The large split type secondary ramming device for underwater piling operation according to claim 1, wherein the second secondary ramming device (2) is internally provided with an upper cylindrical cavity and a lower truncated cone-shaped cavity which are communicated with each other.

3. The large split type piling device for underwater piling operation according to claim 2, wherein the upper cylindrical cavity is communicated with the space of the annular hollow groove (3), and the lower frustum-shaped cavity is communicated with the outside through a plurality of gas circulation grooves (5).

4. The large split type secondary piling device for underwater piling operation according to claim 1, wherein the inner diameter of the upper end surface of the second secondary piling device (2) is smaller than the outer diameter of the annular hollow groove (3) at the bottom of the first secondary piling device (1).

5. A large split type secondary pipe for underwater piling according to claim 1, wherein the outer diameter of the upper end face of the second secondary pipe (2) is larger than the maximum outer diameter of the first secondary pipe (1).

6. The large split type secondary pile driver for the underwater pile driving operation is characterized in that the maximum outer edge diameter of the second secondary pile driver is 6.65m, and the diameter of a pile body suitable for the large split type secondary pile driver is 4.5-6.5 m.

7. The large split type secondary ramming tool for underwater piling operation according to claim 1, wherein the first secondary ramming tool (1) and the second secondary ramming tool (2) are both forged from alloy structural steel, the yield strength limit is greater than 800MPa, and the upper limit of applicable piling energy is 3500-4000 KJ.

8. A large split type alternative piling device for underwater piling according to claim 1, wherein the depth D of the annular hollow groove (3)₃Not exceeding the first thickness D₁0.15 times of.

9. A large split type alternative piling device according to claim 1, wherein said gas circulation groove (5) is a straight groove with a depth D₅No more than 30mm, no more than 100mm in width, and no more than 8 in number.

10. The large split type secondary piling device for underwater piling operation according to claim 1, wherein the cross section of the annular hollow groove (3) is semi-water-drop-shaped, and the outer edge of the annular hollow groove is smoothly connected with the lower end face of the second secondary piling device (2).