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

Abstract

The invention provides a construction method for pulling out a large-tonnage jack of an offshore large-diameter steel pipe pile. The construction method comprises the following steps that S10, a pulling-out platform is built; s20, a jack and a counter-force frame are installed; s30, the steel pipe pile is pulled out, specifically, the steel pipe pile is pulled out through a jack, and in the pulling-out process of the steel pipe pile, the steel pipe pile is cut in a segmented mode; and S40, the replacement steel pipe pile is driven in. The existing construction platform is fully utilized, mechanical equipment is invested as little as possible, the structural stress is clear and definite, the structure is simple, the operation is convenient, the steel consumption is reduced, the construction difficulty is reduced, the construction efficiency is improved, and the construction safety is ensured. The method provides a good solution for pulling out the steel pipe pile in engineering, and has good economic benefits and social benefits.

Description

Technical Field

[0001] The invention belongs to the field of steel pipe pile construction for large offshore bridges, and in particular relates to a large-tonnage jack pulling-out construction method for large-diameter steel pipe piles at sea. Background Art

[0002] The pile foundation of large offshore bridges usually uses permanent steel pipe piles according to the bridge's force requirements. During the insertion process, the steel pipe piles may encounter isolated rocks or other historical construction waste, causing deformation and tilting 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, the construction is difficult, and the construction period is long. Summary of the invention

[0003] In view of this, the present invention aims to propose a large-tonnage jack extraction construction method for large-diameter offshore steel pipe piles, so as to reduce the construction difficulty 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 jack extraction construction method for large-diameter offshore steel pipe piles comprises the following steps:

[0006] S10: Build the unplugging platform:

[0007] The extraction platform is set up around the steel pipe pile to be extracted, and the extraction platform is lower than the top surface of the steel pipe pile;

[0008] S20: Install the jack and reaction frame:

[0009] A reaction frame is installed on the top of the steel pipe pile to be pulled out, and several jacks are arranged around the steel pipe pile to be pulled out. The jacks are set on the pulling out platform and their push rods are upward against the reaction frame;

[0010] S30: Steel pipe pile extraction:

[0011] Step 1: Several jacks work simultaneously to lift the reaction frame upwards, and pull the steel pipe pile out to a height equal to the stroke of the jacks;

[0012] Step 2: Retract the jack push rod to its original position, place a cushion between the jack and the reaction frame, and prepare for the next jacking;

[0013] Step 3: Repeat steps 1 and 2 in sequence to pull out the steel pipe pile:

[0014] During the extraction process of the steel pipe pile, when the steel pipe pile is extracted to the set cutting height each time, the steel pipe pile is cut at the set cutting position, and the cut part of the steel pipe pile is promptly lifted off the site. Then, a reaction frame is reinstalled at the top of the remaining part of the steel pipe pile, and the operation in step 30 is repeated until the entire steel pipe pile is extracted;

[0015] S40: Driving of replacement steel pipe piles:

[0016] After the steel pipe pile is extracted, a new steel pipe column is promptly driven at the extraction position.

[0017] Furthermore, in step S10, an extraction platform is erected using the existing platform 12:

[0018] An uplift pile is driven on the side of the steel pipe pile to be extracted that is away from and adjacent to the existing steel pipe pile. An uplift pile longitudinal beam is provided on the uplift pile. The connection line between the steel pipe pile to be extracted and its adjacent steel pipe pile is perpendicular to the uplift pile longitudinal beam. Two main cross beams are provided on the left and right sides of the steel pipe pile to be extracted. One end of each main cross beam is supported on the corbel of the existing steel pipe pile, and the other end is supported on the uplift pile longitudinal beam. A cushion beam corresponding to the jack is provided between the two main cross beams, and the jack is arranged on the corresponding cushion beam.

[0019] Furthermore, the reaction frame is a "field" - shaped frame structure formed by connecting cross beams and longitudinal beams; the number of jacks 1 is four, and they are arranged at the central positions of the four side frames of the corresponding "field" - shaped frame.

[0020] Furthermore, before installing the reaction frame on the steel pipe pile, stiffening plates are arranged at positions near the top inside the steel pipe pile. The stiffening plates are arranged along the diameter direction of the steel pipe pile and are fixedly connected to the two side walls of the steel pipe pile.

[0021] Furthermore, stiffening ribs are vertically arranged at positions near the top inside the inner wall of the steel pipe pile.

[0022] Furthermore, the jacking stroke of the jack is 20 cm.

[0023] Furthermore, the steel pipe pile is cut once every 60 cm of extraction.

[0024] Compared with the prior art, the large - tonnage jack extraction construction method for large - diameter steel pipe piles in the sea of the present invention has the following advantages:

[0025] The present invention makes full use of the existing construction platform, minimizes the input of mechanical equipment, has a clear and definite structural force, a simple structure, convenient operation, saves the consumption of steel, reduces the construction difficulty, improves the construction efficiency, and ensures the construction safety. This method provides a good solution for the extraction of steel pipe piles in the project and has good economic and social benefits. Description of the Drawings

[0026] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 It is a main view of the platform for pulling out in the embodiment of the present invention;

[0028] Figure 2 for Figure 1 AA view;

[0029] Figure 3 for Figure 1 BB view;

[0030] Figure 4 for Figure 1 CC view;

[0031] Figure 5 A top view of a pull-out platform in an embodiment of the present invention;

[0032] Description of reference numerals:

[0033] 1. Jack; 2. Reaction frame; 3. Pad beam; 4. Main cross beam; 5. Pull-out pile longitudinal beam; 6. Pull-out pile; 7. Steel pipe piles to be pulled out; 8. Existing steel pipe piles; 9. Stiffening plate; 10. Existing steel pipe pile corbel; 12. Existing platform. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0035] 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.

[0036] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" 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 an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0037] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0038] A construction method for pulling out a large-tonnage jack of a large-diameter steel pipe pile in the sea includes the following steps:

[0039] S10: Build a pulling-out platform:

[0040] Utilize the existing platform 12 to build a pulling-out platform around the steel pipe pile 7 to be pulled out, and the pulling-out platform is lower than the top surface of the steel pipe pile.

[0041] As Figure 1-5 shown, the structure of the built pulling-out platform is obtained by simply modifying the existing platform 12:

[0042] Drive at least two anti-pulling piles 6 on the side of the steel pipe pile 7 to be pulled out away from the adjacent existing steel pipe pile 8. The at least two anti-pulling piles 6 are arranged side by side in a direction perpendicular to the connection line between the steel pipe pile to be pulled out and its adjacent steel pipe pile. Set an anti-pulling pile longitudinal beam 5 on the anti-pulling pile 6, and symmetrically set two main cross beams 4 on the left and right sides of the steel pipe pile to be pulled out. One end of the main cross beam 4 is supported on the corbel 10 of the existing steel pipe pile, and one end is supported on the anti-pulling pile longitudinal beam 5.

[0043] S20: Install the jack and the reaction frame:

[0044] Weld a reaction frame 2 on the top of the steel pipe pile 7 to be pulled out, and arrange several jacks 1 around the steel pipe pile 7 to be pulled out. For example, select a jack of model YSD500. The jack 1 is used as the pulling-out device to pull out the abandoned steel pipe pile. The jack 1 is arranged on the pulling-out platform and its push rod faces upward and abuts against the reaction frame 2. The hydraulic control device is placed at a position close to the jack (to facilitate observing the uniform jacking of the jack). Preferably, the reaction frame 2 is a "field"-shaped frame structure composed of cross beams and longitudinal beams, and vertical stiffeners are provided for reinforcement. Four jacks 1 are arranged at the center positions of the four side frames of the corresponding "field"-shaped frame. A cushion beam 3 corresponding to the jack 1 is arranged between the two main cross beams 4. The jack 1 is stably placed on the corresponding cushion beam 3. The cushion beam 3 is used to transfer the load of the jack 1 to the main cross beam 4. The main cross beam 4 bears the load transferred by the upper cushion beam 3, and the pulling-out pile longitudinal beam 5 is used to distribute the load to the anti-pulling pile 6.

[0045] S30: Steel pipe pile extraction:

[0046] Step 1: Turn on the high-pressure oil pump, and four jacks 1 push the crossbeam part of the jacking reaction frame 2 upward evenly at the same time to pull out. The lifting stroke of jack 1 is 20cm, that is, the jack pulls out the steel pipe pile 20cm at a time;

[0047] Step 2: Retract the push rod of jack 1 to its original position, and place 20cm of padding between the jack and the reaction frame to prepare for the next jacking;

[0048] Step 3: Repeat steps 1 and 2 in sequence to pull out the steel pipe pile:

[0049] During the vertical lifting and pulling process of the steel pipe pile, the jack 1 is lifted three times per cycle, that is, the steel pipe pile is cut once every 60 cm when the steel pipe pile is pulled out, and the cut part of the steel pipe pile is lifted away from the site in time by a floating crane, and then the reaction frame 2 is reinstalled on the top of the remaining part of the steel pipe pile. At this time, the push rod of the jack 1 abuts against the reaction frame 2, and the operation of step 30 is repeated until the entire steel pipe pile is pulled out;

[0050] S40: Replacement for driving steel pipe piles:

[0051] In order to ensure the overall stability of the platform and facilitate the smooth driving and positioning of the new casing, a new steel pipe column should be driven into the pulled-out position in time after the steel pipe pile is pulled out.

[0052] In the present invention, before the reaction frame 2 is installed on the steel pipe pile, a stiffening plate 9 is arranged near the top of the steel pipe pile. The stiffening plate 9 is arranged along the diameter direction of the steel pipe pile and connected and fixed to the pipe walls on both sides of the steel pipe pile to reinforce the steel pipe pile and prevent the steel pipe pile from being deformed by force.

[0053] Based on the same principle, since the pull-out resistance of the steel pipe pile is relatively large when the jacking begins, it is necessary to set stiffening ribs vertically on the inner wall of the steel pipe pile near the top to prevent the top of the steel pipe pile from being deformed excessively.

[0054] 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 jack-out construction method for large-diameter steel pipe piles at sea, characterized in that: It includes the following steps: S10: Build a pulling-out platform: The pulling-out platform is built around the steel pipe pile to be pulled out, and the pulling-out platform is lower than the top surface of the steel pipe pile; S20: Install jacks and reaction frames: Install a reaction frame on the top of the steel pipe pile to be pulled out. Arrange several jacks around the steel pipe pile to be pulled out. The jacks are set on the pulling-out platform and their push rods face upward and abut against the reaction frame; S30: Pull out the steel pipe pile: Step 1: Several jacks work simultaneously to顶升 the reaction frame upward, and pull out the steel pipe pile by a height equal to the stroke of the jack; Step 2: The push rod of the jack retracts to its original position, and fill under the jack and the reaction frame to prepare for the next顶升; Step 3: Repeat Step 1 and Step 2 in sequence to pull out the steel pipe pile: During the process of pulling out the steel pipe pile, when the steel pipe pile is pulled out to the set cutting height each time, cut the steel pipe pile at the set cutting position, and timely lift the cut part of the steel pipe pile off the site. Then reinstall the reaction frame on the top of the remaining part of the steel pipe pile, and repeat the operation in Step 30 until the entire steel pipe pile is pulled out; S40: Drive in the replacement steel pipe pile: After the steel pipe pile is pulled out, drive in a new steel pipe column in time at the pulled-out position.

2. The method for pulling out a large-diameter steel pipe pile at sea using a large-tonnage jack according to claim 1, characterized in that: In Step S10, build the pulling-out platform by using the existing platform: Drive anti-pulling piles on the side of the steel pipe pile to be pulled out that is背离 the adjacent existing steel pipe pile. Set anti-pulling pile longitudinal beams on the anti-pulling piles. The connection line between the steel pipe pile to be pulled out and its adjacent steel pipe pile is perpendicular to the anti-pulling pile longitudinal beam. Set two main cross beams on the left and right sides of the steel pipe pile to be pulled out. One end of the main cross beam is supported on the corbel of the existing steel pipe pile, and the other end is supported on the anti-pulling pile longitudinal beam. Set a cushion beam corresponding to the jack between the two main cross beams, and the jack is set on the corresponding cushion beam.

3. The method for pulling out a large-diameter steel pipe pile at sea using a large-tonnage jack according to claim 1, characterized in that: The reaction frame is a "field"-shaped frame structure composed of cross beams and longitudinal beams; The number of jacks is four, and they are arranged at the center positions of the four side frames of the corresponding "field"-shaped frame.

4. The method for pulling out a large-diameter steel pipe pile at sea using a large-tonnage jack according to claim 1, characterized in that: Before installing the reaction frame on the steel pipe pile, set stiffening plates at a position close to the top inside the steel pipe pile. The stiffening plates are arranged along the diameter direction of the steel pipe pile and are connected and fixed to the two side pipe walls of the steel pipe pile.

5. The method for extracting a large-diameter steel pipe pile at sea by a large-tonnage jack according to claim 1, characterized in that: Stiffening ribs are vertically arranged at a position close to the top inside the inner wall of the steel pipe pile.

6. The method for pulling out a large-diameter steel pipe pile at sea using a large-tonnage jack according to claim 1, characterized in that: The jack顶升 stroke is 20 cm.

7. The method for pulling out a large-diameter steel pipe pile at sea using a large-tonnage jack according to claim 1, characterized in that: The steel pipe pile is cut once every 60 cm of pulling out.

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