Construction method for pulling out large-tonnage vibratory hammer of offshore large-diameter steel pipe pile

Abstract

The invention provides a construction method for pulling out a large-tonnage vibratory hammer of an offshore large-diameter steel pipe pile. The construction method comprises the following steps that S10, part of an existing platform on the periphery of a waste steel pipe pile is dismantled; s20, moving the floating crane on which the vibratory pile hammer is hoisted to a construction position for pulling out the steel pipe pile; s30, a vibratory pile hammer is fixedly connected with the top end of the pipe wall of the waste steel pipe pile; s40, the vibratory pile hammer vibrates the steel pipe pile, while the vibratory pile hammer vibrates the steel pipe pile, the floating crane takes up the cable, and the steel pipe pile is pulled out at a time; and S50, after the steel pipe pile is pulled out, a new steel pipe pile is driven again according to the design requirement. According to the construction method, on-site mechanical equipment is fully utilized, the waste steel pipe pile is pulled out at a time, the steel consumption is reduced, the construction progress is accelerated, and the construction safety is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of offshore bridge construction, and in particular relates to an offshore large-diameter steel pipe pile large-tonnage vibration hammer pulling construction method. Background Art

[0002] The pile foundation of large offshore bridges usually uses permanent steel pipe piles according to the stress requirements of the bridge. During the insertion process, the steel pipe piles may encounter isolated rocks or other historical construction waste, causing deformation and tilt of the steel pipe piles, making it impossible for the bored piles to be drilled into holes. At this time, the steel pipe piles need to be pulled out. Due to the limitations of offshore environmental conditions, the pulling out is difficult and the construction period is long. In traditional solutions, full-rotation drilling rigs and live casing drilling rigs are usually used as pulling out equipment. Due to the heavy drilling rigs, the platform transformation project is large and the construction period is long. Summary of the invention

[0003] In view of this, the present invention aims to propose a large-tonnage vibratory hammer extraction construction method for large-diameter offshore steel pipe piles, so as to extract the discarded steel pipe piles in one go and improve the construction efficiency.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] A large-tonnage vibratory hammer extraction construction method for large-diameter offshore steel pipe piles, characterized in that it includes the following steps:

[0006] S10: Remove part of the existing platform around the abandoned steel pipe piles to form an operating space around the steel pipe piles;

[0007] S20: Install the vibratory pile hammer on the hoisting end of the wire rope on the floating crane, and move the floating crane to the construction position for pulling out the steel pipe pile;

[0008] S30: The vibratory pile hammer is connected and fixed to the top of the waste steel pipe pile wall;

[0009] S40: Turn on the power of the vibratory pile hammer, and the vibratory pile hammer performs a vibrating operation on the steel pipe pile. While the vibratory pile hammer is vibrating the steel pipe pile, the floating crane retracts the cable and pulls out the steel pipe pile at one time.

[0010] S50: After the steel pipe piles are pulled out, new steel pipe piles are driven in according to the design requirements.

[0011] Furthermore, in step S10, a stiffening plate is provided inside the steel pipe pile within a range of 2000 mm from the top.

[0012] Furthermore, the stiffening plate is arranged through the center of the steel pipe pile, and the left and right edges of the stiffening plate are respectively connected to the inner wall of the steel pipe pile.

[0013] Furthermore, several stiffening plates are provided and are evenly arranged inside the steel pipe piles.

[0014] Furthermore, the vibrating pile hammer vibrates the steel pipe piles at a low frequency.

[0015] Furthermore, anti-collision piers are driven at the position between the floating crane and the existing platform.

[0016] Compared with the prior art, the method for extracting large-tonnage vibrating hammers of large-diameter steel pipe piles in the sea according to the present invention has the following advantages:

[0017] The method for extracting large-tonnage vibrating hammers of large-diameter steel pipe piles in the sea according to the present invention can make full use of on-site mechanical equipment, make less modification to the existing steel platform, greatly improve the extraction speed of abandoned steel pipe piles, save the consumption of steel, speed up the construction progress, and ensure the construction safety. Description of the Drawings

[0018] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0019] Figure 1 is the front view of the layout relationship among the floating crane, the vibrating pile hammer and the steel pipe piles in the embodiment of the present invention;

[0020] Figure 2 is the top view of the layout relationship among the floating crane, the vibrating pile hammer and the steel pipe piles in the embodiment of the present invention.

[0021] Description of the Reference Numerals:

[0022] 1. Floating crane; 2. Vibrating pile hammer; 3. Abandoned steel pipe pile; 4. Completed steel pipe pile; 5. Existing platform; 6. Anti-collision pier. Detailed Embodiments

[0023] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0026] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0027] A construction method for pulling out large-diameter offshore steel pipe piles with a large-tonnage vibratory hammer, utilizing an existing platform 5, a floating crane 1, and a vibratory pile hammer 2. The discarded steel pipe piles 3 are vibrated by the vibratory pile hammer 2. The static friction between the steel pipe piles 3 and the surrounding soil layers is converted into dynamic friction. Since the dynamic friction is smaller than the static friction, the upward pulling resistance is reduced, and the floating crane 1 continues to provide an upward pulling force. This construction method can make full use of on-site mechanical equipment to pull out the discarded steel pipe piles at one time, greatly saving time. During the operation, the positional relationship between the floating crane 1, the existing platform 5, the discarded steel pipe piles 3, and the vibratory pile hammer 2 is as follows: Figure 1 , 2 As shown, the operation process includes the following steps:

[0028] S10: a stiffening plate is arranged within the abandoned steel pipe pile 3 within a range of 2000 mm from the top, and the stability of the connection between the steel pipe pile and the stiffening plate is ensured, the casing is reinforced, and then part of the existing platform 5 around the abandoned steel pipe pile 3 is removed to form an operating space convenient for operation around the abandoned steel pipe pile 3;

[0029] S20: Install the vibratory pile hammer 2 at the hoisting end of the steel wire rope of the floating crane 1 as a device for pulling out and re-driving piles, and ensure the stability of the connection between the floating crane 1 and the vibratory pile hammer 2; the floating crane is preferably a 1000-ton floating crane, and the vibratory pile hammer 2 is preferably a YZ-800B hydraulic vibratory pile hammer, and then move the floating crane 1 to the construction position for pulling out the abandoned steel pipe pile 3;

[0030] S30: The vibratory pile hammer 2 is connected and fixed to the top of the wall of the discarded steel pipe pile 3; the connection and fixing structure of the vibratory pile hammer and the steel pipe pile is a prior art and will not be described in detail here;

[0031] S40: Turn on the power of the vibrating pile hammer 2, and the vibrating pile hammer 2 performs a vibrating operation on the steel pipe pile 3. The steel pipe pile vibrates, and the static friction between the steel pipe pile and the surrounding soil layer is converted into dynamic friction. Since the dynamic friction is smaller than the static friction, the pull-out resistance can be reduced. While the vibrating pile hammer 2 vibrates the steel pipe pile 3 at a low frequency, the floating crane can continuously provide an upward pull-out force, and the floating crane slowly retracts the cable and the steel wire rope to slowly and all at once pull out the steel pipe pile. When the bottom of the steel pipe pile is pulled out of the soil layer, turn off the power of the vibrating hammer.

[0032] S50: To ensure the overall stability of the platform and facilitate the smooth driving and positioning of the new casing, new steel pipe piles must be driven in time according to the design requirements after the abandoned steel pipe piles are pulled out.

[0033] Preferably, the stiffening plate is arranged through the center of the steel pipe pile, and the left and right edges of the stiffening plate are respectively connected to the inner wall of the steel pipe pile. Further, there are several stiffening plates, which are evenly arranged in the steel pipe pile.

[0034] In the present invention, an anti-collision pier 6 is installed between the floating crane 1 and the existing platform 5 to prevent the floating crane 1 from colliding with the existing platform 5, thereby ensuring the stability of the existing platform 5 and ensuring that the steel pipe piles can be pulled out smoothly.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A large-tonnage vibratory hammer extraction construction method for large-diameter steel pipe piles at sea, characterized in that: The following steps are involved: S10: Remove part of the existing platform around the abandoned steel pipe piles to form an operating space around the steel pipe piles; S20: Install the vibratory pile hammer on the hoisting end of the wire rope on the floating crane, and move the floating crane to the construction position for pulling out the steel pipe pile; S30: The vibratory pile hammer is connected and fixed to the top of the waste steel pipe pile wall; S40: Turn on the power of the vibratory pile hammer, and the vibratory pile hammer performs a vibrating operation on the steel pipe pile. While the vibratory pile hammer is vibrating the steel pipe pile, the floating crane retracts the cable to pull out the steel pipe pile at one time; S50: After the steel pipe piles are pulled out, new steel pipe piles are driven in according to the design requirements.

2. The method for extracting large-diameter steel pipe piles at sea using a large-tonnage vibratory hammer according to claim 1, characterized in that: In step S10, a stiffening plate is arranged inside the steel pipe pile within a range of 2000 mm from the top.

3. The method for extracting large-diameter steel pipe piles at sea using a large-tonnage vibratory hammer according to claim 2, characterized in that: The stiffening plate is arranged through the center of the steel pipe pile, and the left and right edges of the stiffening plate are respectively connected to the inner wall of the steel pipe pile.

4. The method for extracting large-diameter steel pipe piles at sea using a large-tonnage vibratory hammer according to claim 2, characterized in that: There are several stiffening plates, which are evenly arranged inside the steel pipe piles.

5. The method for extracting offshore large-diameter steel pipe piles with a large-tonnage vibratory hammer according to claim 1, characterized in that: The vibratory pile hammer vibrates the steel pipe pile at a low frequency.

6. The method for extracting offshore large-diameter steel pipe piles with a large-tonnage vibratory hammer according to claim 1, characterized in that: A crash barrier is built between the floating crane and the existing platform.

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