A method for retrofitting a steel skirt plate at the bottom of a large concrete anchor

Abstract

The present invention discloses a method for retrofitting a steel skirt plate at the bottom of a large concrete anchor, which relates to the technical field of the method for retrofitting a steel skirt plate. S1: After all the manufacturing work of the main body of the steel skirt plate is completed, it is transported by land or by sea to a semi-submersible barge. S2: The jig is lapped and transferred onto the semi-submersible barge for fixing and positioning. S3: The fixing steel skirt plate support is processed and manufactured, and hydraulic jacking cylinders are evenly placed under the skirt plate support, and then the main body of the steel skirt plate is hoisted and placed on the skirt plate support. S4: The main body of the steel skirt plate is driven to move by the hydraulic jacking cylinders. After the anchor main body and the main body of the steel skirt plate are preliminarily installed through the installation mechanism, the accurate alignment connection between the main body of the steel skirt plate and the anchor bolts is completed. By this method, the prefabrication difficulty of the concrete anchor is effectively reduced, and at the same time, the performance requirements for the crane ship and the semi-submersible barge are also greatly reduced, the selectivity of the ship machinery resources is increased, and the input of the construction cost is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of the method for retrofitting a steel skirt plate, and particularly relates to a method for retrofitting a steel skirt plate at the bottom of a large concrete anchor. Background Art

[0002] At present, the commonly used anchoring foundation types in the construction technology field of deep - sea floating wind turbines at home and abroad include embedded anchor foundation, pile - anchor foundation, suction - anchor foundation and gravity - anchor foundation. Among them, the most obvious defect of the embedded anchor foundation is that the mud penetration is shallow, and the anchoring efficiency and horizontal bearing capacity are low; the pile - anchor foundation and the suction - anchor foundation have high requirements for the performance of construction equipment, and the gravity - anchor foundation is large in volume and heavy in weight; considering the advantages and disadvantages of the above four types of anchoring foundations, the advantages of the gravity - anchor foundation and the embedded anchor foundation can be combined to form a steel - skirt - type gravity - anchor foundation with better adaptability.

[0003] In the steel - skirt - type concrete anchor, the concrete structure mainly plays a role of counterweight by its own gravity, which can effectively ensure the mud penetration depth of the steel skirt plate; and the steel skirt plate can also greatly improve the horizontal bearing capacity of the gravity anchor, breaking the limitation that the gravity - anchor foundation only relies on the self - gravity of the anchor to provide the horizontal bearing capacity. On the premise of meeting the design requirements, the volume of the concrete anchor can be effectively reduced, and the difficulty of prefabricating large - volume concrete can be reduced. At the same time, the weight of a single steel - skirt - type concrete anchor can be effectively reduced, and the sea transportation and construction costs can be greatly reduced.

[0004] However, for this new type of hybrid anchor foundation - the steel - skirt - type concrete anchor, there is currently no construction method related to the combined assembly of the steel skirt plate and the concrete anchor, which increases the difficulty of prefabricating the concrete anchor. At the same time, the requirements for the performance of the crane ship and the semi - submersible barge are also increased, the selectivity of ship - machine resources is reduced, the investment in construction costs is increased, and the construction efficiency is reduced. Therefore, a method for retrofitting the steel skirt plate at the bottom of a large concrete anchor is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for retrofitting the steel skirt plate at the bottom of a large concrete anchor. The specific manifestation is that during the prefabrication construction process of the large concrete anchor, the upper anchor plate and the fastening anchor bolts of the steel skirt plate embedded parts are arranged in place, and then the concrete anchor is poured. The steel skirt plate is manufactured in a steel structure factory according to the design drawings and transported to the semi - submersible barge. Through reasonable coordination and cooperation of ship - machines and the synchronous hydraulic jacking construction mode, the combined assembly construction of the steel skirt plate and the concrete anchor on the semi - submersible barge is achieved.

[0006] The purpose of the present invention can be realized through the following technical solutions:

[0007] A method for retrofitting the steel skirt plate at the bottom of a large concrete anchor specifically includes the following steps;

[0008] S1. Fabrication of the steel skirt plate main body: Locate a steel structure factory according to the design drawings and process the steel skirt plate main body according to the drawings. After all the fabrication work of the steel skirt plate main body is completed, transport it by land or sea to the semi-submersible barge;

[0009] S2. Design and fabricate a jig according to the size and weight of the precast concrete anchor main body, then complete the lap joint of the jig and transport it onto the semi-submersible barge for fixed positioning;

[0010] S3. After the lap joint of the jig is completed, fabricate and process the fixed steel skirt plate support, evenly place three hydraulic jacking cylinders under the skirt plate support, then lift the steel skirt plate main body and place it on the skirt plate support. At the same time, correct and fix the position of the steel skirt plate main body on the skirt plate support through the fixing mechanism;

[0011] S4. Precisely place the concrete anchor main body on the jig, drive the steel skirt plate main body to move through the hydraulic jacking cylinders. After the preliminary installation of the anchor main body and the steel skirt plate main body through the installation mechanism, then complete the precise alignment connection between the steel skirt plate main body and the anchor bolts, and the combined assembly construction of the anchor main body and the bottom steel skirt plate main body can be completed.

[0012] As a further solution of the present invention: The installation mechanism includes an installation shell, the installation shell is fixedly installed on the steel skirt plate main body, a first inclined block is movably installed in the installation shell, a telescopic sleeve rod is fixedly installed between the first inclined block and the inner wall of the installation shell, a first spring is sleeved outside the telescopic sleeve rod, the first spring is fixedly installed between the first inclined block and the inner wall of the installation shell, a fixing rod is fixedly installed at the corresponding position of the bottom of the anchor main body and the installation shell, a second inclined block is fixedly installed at the bottom of the fixing rod, and the inclined surfaces of the first block and the second inclined block are in contact with each other.

[0013] As a further solution of the present invention: A kidney-shaped groove is opened on one side of the installation shell, a one-way threaded rod passes through the kidney-shaped groove, and the one-way threaded rod is fixedly installed on the first inclined block.

[0014] As a further solution of the present invention: A threaded ring is sleeved outside the one-way threaded rod, and the threaded ring is threadedly connected with the one-way threaded rod.

[0015] As a further solution of the present invention: The fixing mechanism includes a fixing shell, the fixing shell is fixedly installed on the skirt plate support, a bidirectional threaded rod is rotatably installed in the fixing shell, two threaded seats are threadedly connected to the bidirectional threaded rod, a side plate is fixedly installed on the threaded seat, the side plate is located above the skirt plate support, and a limiting disk is fixedly installed on the bidirectional threaded rod.

[0016] As a further solution of the present invention: A motor is fixedly installed in the fixing shell through a fixing ring, and the rotating end of the motor is fixedly connected to one end of the bidirectional threaded rod.

[0017] As a further solution of the present invention: a second spring is fixedly installed on the side plate, and a fixing plate is fixedly installed at one end of the second spring away from the side plate.

[0018] As a further solution of the present invention: a telescopic guide rod is fixedly installed between the fixing plate and the side plate.

[0019] As a further solution of the present invention: a slide rail is fixedly installed on the inner wall of the fixed shell, and the bottom of the threaded seat is slidably installed on the slide rail.

[0020] As a further solution of the present invention: a plurality of anti-slip strips are fixedly installed on the fixing plate.

[0021] Beneficial effects of the present invention:

[0022] (1) In the present invention, the method for post-installing the steel skirt plate can realize the development of multiple construction work surfaces, effectively reduce the construction period, and improve the construction efficiency. The specific manifestation is that during the prefabrication construction of the large concrete anchor block, the upper anchor plate and fastening anchor bolts of the steel skirt plate embedded parts are arranged in place, and then the concrete anchor block is poured. The steel skirt plate is manufactured in a steel structure factory according to the design drawings and transported to the semi-submersible barge. Through reasonable coordination of ship machinery and the synchronous hydraulic jacking construction mode, the construction of the combined assembly of the steel skirt plate and the concrete anchor block on the semi-submersible barge is achieved. By this method, the prefabrication difficulty of the concrete anchor block is effectively reduced, and at the same time, the performance requirements for the crane ship and the semi-submersible barge are also greatly reduced. The selectivity of ship machinery resources is increased, and the investment in construction costs is effectively reduced;

[0023] (2) In the present invention, the installation mechanism is set to initially install the anchor block main body and the steel skirt plate main body, further strengthen the stability between the installations of the anchor block main body and the steel skirt plate main body, and at the same time ensure the position stability between the anchor block main body and the steel skirt plate main body when the anchor bolts are installed;

[0024] (3) In the present invention, the fixing mechanism can fix the position of the steel skirt plate main body on the skirt plate support, and further achieve the purpose of correcting and fixing the position of the steel skirt plate main body, making the installation between the anchor block main body and the steel skirt plate main body more convenient. Brief description of the drawings

[0025] The following further describes the present invention with reference to the drawings.

[0026] Figure 1 is the three-dimensional structure schematic diagram of the present invention;

[0027] Figure 2 is the structure schematic diagram of the steel skirt plate and the anchor block of the present invention;

[0028] Figure 3It is a schematic structural diagram of the jig of the present invention;

[0029] Figure 4 It is a schematic structural diagram of the steel skirt plate of the present invention;

[0030] Figure 5 It is a schematic structural diagram of the skirt plate bracket of the present invention;

[0031] Figure 6 It is a schematic structural diagram of the installation mechanism of the present invention;

[0032] Figure 7 It is a schematic internal structural diagram of the installation shell of the present invention;

[0033] Figure 8 It is a schematic obliquely side structure diagram of the skirt plate bracket of the present invention;

[0034] Figure 9 It is a schematic structural diagram of the fixing mechanism of the present invention;

[0035] Figure 10 It is a schematic structural diagram of the fixing plate of the present invention.

[0036] In the figure:

[0037] 1, semi-submersible barge; 2, jig; 3, skirt plate bracket; 4, installation mechanism; 5, anchor body; 6, anchor bolt; 7, steel skirt plate body; 8, fixing mechanism; 9, hydraulic jacking cylinder; 41, installation shell; 42, first inclined block; 43, telescopic sleeve rod; 44, fixing rod; 45, second inclined block; 46, kidney-shaped groove; 47, one-way threaded rod; 48, threaded ring; 49, first spring;

[0038] 81, fixing shell; 82, side plate; 83, bidirectional threaded rod; 84, threaded seat; 85, motor; 86, fixing plate; 87, second spring; 88, telescopic guide rod; 89, slide rail; 810, limiting disc; 811, anti-slip strip. Detailed implementation manners

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0040] Embodiment 1

[0041] Please refer to Figures 1-10 As shown, the present invention is a method for retrofitting the steel skirt plate at the bottom of a large concrete anchor, which specifically includes the following steps;

[0042] S1. Fabrication of the steel skirt plate main body 7: Locate a steel structure factory according to the design drawings and process the steel skirt plate main body 7 in accordance with the drawings. The upper anchor plate and anchor bolts 6 are prefabricated in advance and embedded at the precast site of the concrete anchor block main body 5. Meanwhile, the pads, vertical plates, and gusset plates of the steel skirt plate main body 7 are intensively processed, and the splicing and welding are completed. After ultrasonic testing and non-destructive testing, the anti-corrosion coating can be applied. After all the fabrication work of the steel skirt plate main body 7 is completed, it is transported by land or sea to the semi-submersible barge 1;

[0043] S2. Design and fabricate a jig 2 based on the size and weight of the precast concrete anchor block main body 5. The jig 2 is mainly composed of a Bailey truss and profiled steel. Then, the jig 2 is completed in splicing and transported onto the semi-submersible barge 1 for fixed positioning. First, the semi-submersible barge 1 is berthed at the dock to transfer the jig 2 materials onto the ship. Then, arrange construction workers to complete the splicing of the jig 2 on the semi-submersible barge 1 using a truck crane and other construction tools. At the same time, at the positions of the hull structure supports or ribs and stiffeners of the semi-submersible barge 1, ensure that the load borne by the entire jig 2 is within the range of the deck load of the semi-submersible barge 1;

[0044] S3. After the jig 2 is completed in splicing, fabricate and process the fixed steel skirt plate support 3, and evenly place three hydraulic jacking cylinders 9 under the skirt plate support 3. Then, lift the steel skirt plate main body 7 and place it on the skirt plate support 3. During the process, accurately measure and position to fix the position of the steel skirt plate main body 7. If necessary, spot-weld the steel skirt plate main body 7 and the skirt plate support 3 with an electric welding machine. At the same time, correct and fix the position of the steel skirt plate main body 7 on the skirt plate support 3 through the fixing mechanism 8;

[0045] S4. After the erection of the concrete anchor main body 5 formwork 2, the fabrication of the skirt board support 3, and the fixation and positioning of the steel skirt board main body 7 and the hydraulic jacking cylinder 9 on the semi-submersible barge 1, the construction management personnel notify the semi-submersible barge 1 to immediately move to the front of the wharf and berth for mooring. The concrete anchor main body 5 is transported to the wharf using SPMT trolleys, and then the concrete anchor main body 5 is lifted onto the semi-submersible barge 1 by a crane ship. Slowly lower the hook to accurately place the concrete anchor main body 5 on the formwork 2. At this time, it is necessary to continuously adjust the position of the concrete anchor to basically align the anchor rod of the embedded part with the bolt holes of the backing plate on the steel skirt board. During the lowering process of the anchor, the surveyors need to continuously correct the deviation. Then the crane ship gradually unloads the load. When the concrete anchor is completely placed on the steel structure formwork 2 of the semi-submersible barge 1, notify the workers to release the lifting points above the anchor at this time. The remaining workers weld the limit clamping plates to the concrete anchor. At the same time, weld the diagonal braces around the anchor main body 5 and tie them with turnbuckles. Two steel skirt board main bodies 7 are assembled and fixed at the bottom of one concrete anchor main body 5. At this time, the construction management personnel guide the workers to synchronously perform the jacking operation on the hydraulic jacking cylinder 9, and drive the steel skirt board main body 7 to move through the hydraulic jacking cylinder 9. During the process, it is necessary to continuously fine-tune the levelness of the steel skirt board. Wait until the bolt holes of the steel skirt board main body 7 are accurately aligned with the anchor bolts 6. After the initial installation of the anchor main body 5 and the steel skirt board main body 7 through the installation mechanism 4, the construction management personnel then check the centering situation of each anchor bolt 6 and the bolt hole. It must be ensured that each anchor bolt 6 can pass through the bolt hole unobstructed and the thread on the anchor rod cannot be damaged. Then complete the accurate alignment connection between the steel skirt board main body 7 and the anchor bolts 6. The workers apply grease to the anchor bolts 6, and the professionals perform the initial tightening of the anchor bolts 6 and nuts. Then cooperate with the professionals for re-tightening and reach the torque required by the design to complete the combined assembly construction of the concrete anchor main body 5 and the bottom steel skirt board main body 7, and the combined assembly construction of the anchor main body 5 and the bottom steel skirt board main body 7 can be completed.

[0046] Embodiment 2

[0047] On the basis of Embodiment 1, please refer to Figures 1-7As shown, the installation mechanism 4 includes an installation shell 41. The first inclined block 42 is installed through the provided installation shell 41. The installation shell 41 is fixedly installed on the steel skirt body 7, so that the first inclined block 42 can move simultaneously with the steel skirt body 7. The first inclined block 42 is movably installed in the installation shell 41. A telescopic sleeve rod 43 is fixedly installed between the first inclined block 42 and the inner wall of the installation shell 41. The movement of the first inclined block 42 is limited through the provided telescopic sleeve rod 43, which is beneficial to the movement of the first inclined block 42. A first spring 49 is sleeved outside the telescopic sleeve rod 43. The first spring 49 drives the first inclined block 42 to reset, which is beneficial to fixing the position of the second inclined block 45 through the first inclined block 42. The first spring 49 is fixedly installed between the first inclined block 42 and the inner wall of the installation shell 41. A fixing rod 44 is fixedly installed at the corresponding position of the bottom of the anchor body 5 and the installation shell 41. The second inclined block 45 is installed through the fixing rod 44. The bottom of the fixing rod 44 is fixedly installed with the second inclined block 45. The inclined surfaces of the first inclined block 42 and the second inclined block 45 are in contact with each other, which is beneficial to the interaction between the first inclined block 42 and the second inclined block 45.

[0048] A kidney-shaped groove 46 is formed on one side of the installation shell 41. The provided kidney-shaped groove 46 provides a moving range for the one-way threaded rod 47. The one-way threaded rod 47 penetrates through the kidney-shaped groove 46. The first inclined block 42 is driven to move through the provided one-way threaded rod 47, which is beneficial to limiting the position of the first inclined block 42. The one-way threaded rod 47 is fixedly installed on the first inclined block 42. A threaded ring 48 is sleeved outside the one-way threaded rod 47. The one-way threaded rod 47 is limited through the provided threaded ring 48, and then the first inclined block 42 is limited. The threaded ring 48 is threadedly connected with the one-way threaded rod 47.

[0049] Embodiment 3

[0050] On the basis of Embodiment 2, please refer to Figures 1-7As shown, the fixing mechanism 8 includes a fixing housing 81. The bidirectional threaded rod 83 is installed through the provided fixing housing 81. The fixing housing 81 is fixedly installed on the skirt plate bracket 3. A bidirectional threaded rod 83 is rotatably installed in the fixing housing 81. The threaded seat 84 is driven to move through the provided Basa. Two threaded seats 84 are threadedly connected to the bidirectional threaded rod 83. The threaded seat 84 drives the fixing plate 86 to move. A slide rail 89 is fixedly installed on the inner wall of the fixing housing 81. The provided slide rail 89 is beneficial for the movement of the threaded seat 84 and at the same time limits the threaded seat 84 to prevent the threaded seat 84 from rotating with the rotation of the bidirectional threaded rod 83, ensuring that the threaded seat 84 moves with the rotation of the bidirectional threaded rod 83. The bottom of the threaded seat 84 is slidably installed on the slide rail 89. A side plate 82 is fixedly installed on the threaded seat 84. The side plate 82 drives the fixing plate 86 to move. The side plate 82 is located above the skirt plate bracket 3. A limit disk 810 is fixedly installed on the bidirectional threaded rod 83. The provided limit disk 810 limits the range of one end of the threaded seat 84. A motor 85 is fixedly installed in the fixing housing 81 through a fixing ring. The provided motor 85 drives the bidirectional threaded rod 83 to rotate, providing power for the rotation of the bidirectional threaded rod 83. The rotating end of the motor 85 is fixedly connected to one end of the bidirectional threaded rod 83. A second spring 87 is fixedly installed on the side plate 82. The provided second spring 87 exerts a force on the fixing plate 86, which is beneficial for the fixing plate 86 to fix the steel skirt plate body 7. The end of the second spring 87 away from the side plate 82 is fixedly installed with a fixing plate 86. The position of the steel skirt plate body 7 is corrected and fixed through the fixing plate 86. A plurality of anti-slip strips 811 are fixedly installed on the fixing plate 86. The provided fixing plate 86 increases the friction force on the steel skirt plate body 7 of the fixing plate 86, further improving the fixing effect of the fixing plate 86 on the steel skirt plate body 7. A telescopic guide rod 88 is fixedly installed between the fixing plate 86 and the side plate 82. The provided telescopic guide rod 88 guides and limits the fixing plate 86.

[0051] Working principle of the present invention: When the steel skirt plate main body 7 is driven by the hydraulic jacking cylinder 9 to move upward to the moving position, the second inclined block 45 enters the installation shell 41. As the steel skirt plate main body 7 continues to move upward, the inclined surface of the second inclined block 45 fits with the inclined surface of the first inclined block 42. As the first inclined block 42 continues to move upward with the steel skirt plate main body 7, the second inclined block 45 exerts a force on the first inclined block 42 to drive the first inclined block 42 to move towards the position close to the telescopic sleeve rod 43, and at the same time drives the first spring 49 and the telescopic sleeve rod 43 to be compressed. Until the bottom of the first inclined block 42 moves to the top of the second inclined block 45, the first spring 49 resets to drive the first inclined block 42 to move away from the telescopic sleeve rod 43, thereby fixing the second inclined block 45 through the first inclined block 42, and completing the preliminary installation of the steel skirt plate main body 7 and the anchor body 5; Before the steel skirt plate main body 7 drives the installation mechanism 4 to move upward, rotate the rotary threaded ring 48 to a position away from the installation shell 41 to release the position limitation of the one-way threaded rod 47. When the first inclined block 42 moves, it drives the one-way threaded rod 47 to move in the kidney-shaped groove 46. After the preliminary fixation of the steel skirt plate main body 7 and the anchor body 5 is completed through the installation mechanism 4, then rotate the threaded ring 48 to fit with the outer surface of the installation shell 41, thereby limiting the position of the one-way threaded rod 47, to prevent the one-way threaded rod 47 from being accidentally touched during the preliminary fixation of the steel skirt plate main body 7 and the anchor body 5 by the installation mechanism 4, resulting in a change in the position of the first inclined block 42. The position of the first inclined block 42 is fixed through the threaded ring 48. When it is necessary to release the preliminary installation between the installation mechanism 4 and the steel skirt plate main body 7 and the anchor body 5, first rotate the threaded ring 48 to make it away from the installation shell 41 to release the limit on the one-way threaded rod 47, and then drive the first inclined block 42 to move towards the position close to the telescopic sleeve rod 43 through the one-way threaded rod 47. Until the first inclined block 42 moves to a suitable position and then rotate the threaded ring 48 to fit with the outer surface of the installation shell 41, thereby realizing the position fixation of the first inclined block 42, which is beneficial to releasing the preliminary installation between the installation mechanism 4 and the steel skirt plate main body 7 and the anchor body 5.

[0052] After the steel skirt plate main body 7 is placed on the skirt plate support 3, start the motor 85 to drive the bidirectional threaded rod 83 to rotate, and at the same time drive the two threaded seats 84 to approach each other. Drive the side plates 82 on both sides to approach each other through the two threaded seats 84, and at the same time drive the fixing plates 86 to approach each other. At the same time, push the steel skirt plate main body 7 towards the center position of the skirt plate support 3 through the fixing plates 86 on both sides. Until the steel skirt plate main body 7 moves to the required position, the position of the steel skirt plate main body 7 on the skirt plate support 3 can be fixed through the fixing plates 86, so as to achieve the purpose of correcting and fixing the position of the steel skirt plate main body 7.

[0053] The above has described in detail an embodiment of the present invention, but the above content is only a preferred embodiment of the present invention and cannot be considered as defining the scope of implementation of the present invention. All equivalent changes and improvements made in accordance with the scope of the application of the present invention shall still fall within the scope covered by the patent of the present invention.

Claims

1. A method for retrofitting a steel skirt plate at the bottom of a large concrete anchor, characterized in that Specifically, it includes the following steps; S1. Fabrication of the steel skirt board main body (7): According to the design drawings, find a steel structure factory to process the steel skirt board main body (7) according to the drawings. The upper anchor plate and anchor bolts (6) are processed in advance and embedded at the prefabrication site of the concrete anchor block main body (5). After all the fabrication work of the steel skirt board main body (7) is completed, it is transported by land or sea to the semi-submersible barge (1); S2. Design and fabricate a jig (2) according to the size and weight of the prefabricated concrete anchor block main body (5). Then, complete the lashing of the jig (2) and transport it onto the semi-submersible barge (1) for fixing and positioning; S3. After the lashing of the jig (2) is completed, fabricate and process the fixed steel skirt board support (3), and evenly place three hydraulic jacking cylinders (9) under the skirt board support (3). Then, lift the steel skirt board main body (7) and place it on the skirt board support (3). At the same time, correct and fix the position of the steel skirt board main body (7) on the skirt board support (3) through the fixing mechanism (8); S4. Accurately place the concrete anchor block main body (5) on the jig (2). Drive the steel skirt board main body (7) to move through the hydraulic jacking cylinder (9). After the initial installation of the anchor block main body (5) and the steel skirt board main body (7) through the installation mechanism (4), then complete the accurate alignment connection between the steel skirt board main body (7) and the anchor bolts (6), and the combined assembly construction of the anchor block main body (5) and the bottom steel skirt board main body (7) can be completed; The installation mechanism (4) includes an installation shell (41), the installation shell (41) is fixedly installed on the steel skirt board main body (7), a first inclined block (42) is movably installed in the installation shell (41), a telescopic sleeve rod (43) is fixedly installed between the first inclined block (42) and the inner wall of the installation shell (41), a first spring (49) is sleeved outside the telescopic sleeve rod (43), and the first spring (49) is fixedly installed between the first inclined block (42) and the inner wall of the installation shell (41). A fixing rod (44) is fixedly installed at the corresponding position of the bottom of the anchor block main body (5) and the installation shell (41), and a second inclined block (45) is fixedly installed at the bottom of the fixing rod (44). The inclined surfaces of the first inclined block (42) and the second inclined block (45) are in contact with each other.

2. The post-installation method of the steel skirt plate at the bottom of a large concrete anchor block according to claim 1, characterized in that A kidney-shaped groove (46) is opened on one side of the installation shell (41), and a one-way threaded rod (47) passes through the kidney-shaped groove (46). The one-way threaded rod (47) is fixedly installed on the first inclined block (42).

3. A method for retrofitting a steel skirt plate at the bottom of a large concrete anchor block according to claim 2, characterized in that, A threaded ring (48) is sleeved outside the one-way threaded rod (47), and the threaded ring (48) is threadedly connected to the one-way threaded rod (47).

4. A method for retrofitting a steel skirt plate at the bottom of a large concrete anchor block according to claim 1, characterized in that, The fixing mechanism (8) includes a fixing shell (81), the fixing shell (81) is fixedly installed on the skirt board support (3), a bidirectional threaded rod (83) is rotatably installed in the fixing shell (81), two threaded seats (84) are threadedly connected to the bidirectional threaded rod (83), a side plate (82) is fixedly installed on the threaded seat (84), the side plate (82) is located above the skirt board support (3), and a limiting disk (810) is fixedly installed on the bidirectional threaded rod (83).

5. A method for retrofitting a steel skirt plate at the bottom of a large concrete anchor block according to claim 4, characterized in that, A motor (85) is fixedly installed inside the fixed housing (81) through a fixing ring, and the rotating end of the motor (85) is fixedly connected to one end of a bidirectional threaded rod (83).

6. A method for retrofitting a steel skirt plate at the bottom of a large concrete anchor block according to claim 4, characterized in that, A second spring (87) is fixedly installed on the side plate (82), and a fixing plate (86) is fixedly installed at one end of the second spring (87) away from the side plate (82).

7. A method for retrofitting a steel skirt plate at the bottom of a large concrete anchor block according to claim 6, characterized in that, A telescopic guide rod (88) is fixedly installed between the fixing plate (86) and the side plate (82).

8. A method for retrofitting a steel skirt plate at the bottom of a large concrete anchor block according to claim 4, characterized in that A slide rail (89) is fixedly installed on the inner wall of the fixed housing (81), and the bottom of the threaded seat (84) is slidably installed on the slide rail (89).

9. A method for retrofitting a steel skirt plate at the bottom of a large concrete anchor block according to claim 6, characterized in that, A plurality of anti-slip strips (811) are fixedly installed on the fixing plate (86).

Images