Gravity type block pier prefabricated block hoisting device and installation method

Abstract

The application relates to the technical field of hydraulic construction engineering, in particular to a gravity type block pier prefabricated block hoisting device and a mounting method, wherein the hoisting beam comprises an upper beam, a rotary support structure and a lower beam; the upper beam is connected with the lower beam through the rotary support structure; the rotary support structure and the lower beam are linearly arranged along the axis of the upper beam in sequence; two transmission assemblies are slidably connected in the lower beam, and the two transmission assemblies are located on the two sides of the support structure. The application has the effects of ensuring the angle adjustment between the prefabricated concrete blocks, pushing the rear block to move to the alignment direction of the front block through the hydraulic telescopic arm, ensuring the alignment through the push arm crossbar, significantly improving the underwater installation stability of the prefabricated blocks, facilitating the control of the block installation seam width and the edge line, avoiding the problems of the through cracks, the angle defects, the large tooth deviation, the uneven block spacing, the large structural size deviation and the like.

Description

Technical Field

[0001] This invention relates to the technical field of water conservancy engineering, and in particular to a gravity-type block wharf prefabricated block hoisting device and installation method. Background Technology

[0002] Gravity wharves are wharves that maintain stability by the weight of the structure itself and the fill material. They can be further divided into block wharves, caisson wharves, buttresses, seated cylindrical wharves, and cast-in-place concrete or masonry structures. They have advantages such as good integrity, strong load-bearing capacity, good durability, and convenient maintenance. Among them, gravity block wharves are more widely used in areas with good geological conditions.

[0003] As the main structure of the wall, the wharf blocks are generally precast concrete. Their precast quality and installation accuracy directly determine the safety and stability of the wharf structure. Especially under harsh environments, high acceptance standards, and strict management requirements, how to ensure the accurate installation of precast blocks underwater has become the key to the quality control of gravity block wharves.

[0004] Currently, the installation of precast blocks generally adopts a conventional bottom-up installation method. However, due to limitations such as natural conditions, the performance of construction machinery, and the skill level of divers and crane operators, it is not easy to control the width of the block installation joints and the edge lines. This often leads to problems such as through cracks, missing corners, excessive misalignment, uneven block spacing, and large deviations in structural dimensions. These issues affect the function of the wharf, not only increasing the cost of defect remediation during construction and delaying the construction period, but also directly impacting the safety, economy, and reliability of the wharf during its service life. Summary of the Invention

[0005] To facilitate the control of block installation joint width and edge lines, and reduce the occurrence of phenomena such as through cracks, missing corners, excessive misalignment, uneven block spacing, and large deviations in structural dimensions, this invention provides a gravity-type block wharf prefabricated block hoisting device and installation method.

[0006] The gravity-type precast block hoisting device and installation method for a block wharf provided by this invention adopts the following technical solution:

[0007] Preferably, the lifting beam includes an upper beam, a slewing support structure, and a lower beam. The upper beam is connected to the lower beam through the slewing support structure, and the slewing support structure and the lower beam are arranged linearly along the central axis below the upper beam.

[0008] The lower beam has two internal sliding connections of two transmission components, which are located on both sides of the support structure. Each transmission component has two self-locking rotary devices fixedly connected to its bottom. The output shaft of each rotary device is connected to a hanger rod at its end. The four hangers are arranged in pairs, and each pair of hangers is arranged linearly.

[0009] Two hydraulic telescopic arms are fixedly connected to both sides of the lower beam. Each pair of corresponding hydraulic telescopic arms is symmetrically distributed on both sides of the slewing support structure. The operator can operate only one side of the hydraulic telescopic arm to push the precast concrete block in one direction. After pushing the distance exceeds the rated distance, the operator can operate the other side of the hydraulic telescopic arm to push the precast concrete block back, so that multiple precast concrete blocks are aligned.

[0010] Preferably, the lower beam has a groove inside, and a serrated track is fixedly connected inside the groove. Each transmission component includes a support frame, and a dual-axis motor is fixedly connected inside each support frame. The two output ends of each dual-axis motor are driven by moving gears. The outer surface of each moving gear meshes with the outer surface of the serrated track. The top of each boom is fixedly connected to the bottom of the corresponding support frame. The boom is an L-shaped boom. The dual-axis motor can drive the boom to move below the lower beam, thereby allowing the boom to penetrate into precast concrete blocks of different sizes to construct different block wharves.

[0011] Preferably, each of the hydraulic telescopic arms includes a push arm longitudinal rod and a push arm cross rod, and the outer surface of each push arm cross rod is slidably connected to the interior of the corresponding push arm longitudinal rod. The precast concrete block is clamped and pushed by the extension and retraction of the hydraulic telescopic arm.

[0012] Preferably, the top of the upper beam has several lifting points, and three slewing bearing motors are fixedly connected to the top of the upper beam. Each slewing bearing motor has an output gear connected to the end of its output shaft. The slewing support structure includes a driven disc with teeth inside. The outer surface of each output gear meshes with the outer surface of the teeth. The top of the driven disc is rotatably connected to the interior of the upper beam, and the bottom of the driven disc is fixedly connected to the interior of the lower beam.

[0013] By adopting the above technical solution, the rotation of the slewing bearing motor drives the lower beam and the precast concrete block to rotate, thereby changing the angle of the precast concrete block.

[0014] An installation method for a gravity-type block wharf hoisting device includes the following steps:

[0015] Step A: Establish underwater installation baselines and design and manufacture precast concrete blocks;

[0016] Step B: Connect the precast concrete blocks to the lifting beam;

[0017] Step C: The floating crane lifts the lifting beam;

[0018] Step D: Lower the precast concrete block along the baseline position, and align and install the precast concrete block.

[0019] Preferably, in step A, the specific construction steps for manufacturing precast concrete blocks include:

[0020] A precast concrete block with four lifting holes is constructed, the interior of each lifting hole being adapted to the bottom of the lifting rod, and each lifting hole being vertically connected and narrower at the top and wider at the bottom.

[0021] Preferably, in step B, the specific construction steps for connecting the precast concrete block to the lifting beam include:

[0022] The slewing device is started and rotated 90° until the L-shaped head of the boom is aligned with the long side of the lifting hole. The floating crane lifts the lifting beam and lowers it. The boom is lowered into the lifting hole and passes through the precast concrete block. The slewing device rotates 90° and locks itself. The angle of the boom can be changed by the slewing device to facilitate the lifting or lowering of the boom through the precast concrete block.

[0023] In step C, the specific construction steps for the floating crane to lift the lifting beam include: each lifting point has a sling inserted inside, the sling is suspended on the hook of the floating crane, and the hook of the floating crane is equipped with a GPS antenna measurement system to locate the center of gravity of the precast concrete block, ensuring the accuracy of the installation.

[0024] Preferably, in step D, the specific construction steps for lowering the precast concrete block along the baseline position include:

[0025] d1. The floating crane suspends the precast concrete block above the baseline, stops moving the floating crane, and slowly lowers the precast block to the baseline position to form the front block;

[0026] The specific construction steps for aligning, lowering, and installing the precast concrete blocks include:

[0027] d2. The floating crane suspends other precast concrete blocks on one side of the front precast concrete block to form a rear block, and activates the slewing support structure and each hydraulic telescopic arm to align the front block and the rear block.

[0028] d3. The floating crane slowly lowers the rear block to its final position.

[0029] Preferably, in step d2, the specific construction steps for activating the slewing support structure and each hydraulic telescopic arm, and aligning the front and rear blocks, include:

[0030] The angle of the rear block is adjusted by activating the slewing support structure until one side of the rear block is fully aligned and overlapped with one side of the front block. The two or more precast concrete blocks are then aligned by using the hydraulic telescopic arm to push them together.

[0031] Preferably, in step d2, the specific construction steps for activating the slewing support structure and each hydraulic telescopic arm to align the front and rear blocks include: after the side alignment, activating the hydraulic telescopic arm, pushing the crossbars close to the rear block until two sides of the rear block are aligned with the two sides corresponding to the front block, and the four pusher crossbars together clamp a precast concrete block to prevent the precast concrete block from shaking during suspension, causing serious damage and rendering it unusable, thus facilitating the protection of the precast concrete block and reducing financial losses and construction time.

[0032] In summary, the present invention has the following beneficial technical effects:

[0033] 1. In this method, the angle of the precast concrete blocks can be adjusted through the slewing support structure, so that the sides of the rear block and the front block are in full contact, ensuring the angle between the precast concrete blocks is corrected. The hydraulic telescopic arm pushes the rear block to move in the direction of alignment with the front block, and the alignment is ensured by the push arm crossbar. This significantly improves the underwater installation stability of the precast blocks, facilitates the control of the block installation joint width and edge line, and avoids problems such as through cracks, missing corners, excessive misalignment, uneven block spacing, and large deviations in structural dimensions. At the same time, it can also minimize the presence of divers during the block alignment and installation process. This method has the advantages of high mechanization, fewer construction procedures, low operation risk, high installation accuracy, short construction period, and good quality of subsequent component installation.

[0034] 2. In this method, the direction of the boom's L-shaped head is changed by a slewing device, allowing the boom to quickly penetrate or detach from the precast concrete block. The position of the boom is changed by a transmission component, which helps the lifting beam adapt to different types of precast concrete blocks and construct block wharves of different specifications. The self-locking function of the slewing device allows the boom to bear the weight of the precast concrete block. The hydraulic telescopic arm clamps the precast concrete block. The cooperation between the boom and the hydraulic telescopic arm can prevent the precast concrete block from swaying significantly during suspension. When the center of gravity of the precast concrete block shifts due to factors such as sea winds or the movement of the floating crane, it helps to prevent cracks from appearing in the precast concrete block itself. Attached Figure Description

[0035] Figure 1 This is a three-dimensional structural diagram of the gravity-type block wharf precast block hoisting device and installation method of the present invention when hoisting precast concrete blocks.

[0036] Figure 2 yes Figure 1 The front view;

[0037] Figure 3 yes Figure 1 Top view;

[0038] Figure 4 yes Figure 3 A sectional view along line AA.

[0039] Figure 5 This is a three-dimensional structural diagram of the lifting beam in the gravity-type block wharf prefabricated block hoisting device and installation method of the present invention;

[0040] Figure 6 This is a schematic diagram of the structure of the precast concrete block in the gravity-type block wharf precast block hoisting device and installation method of the present invention;

[0041] Figure 7 This is a schematic diagram of the structure after multiple precast concrete blocks are stacked and installed in the gravity-type block wharf precast block hoisting device and installation method of the present invention.

[0042] Figure 8 This is a schematic diagram of the structure of multiple precast concrete blocks installed side by side in the gravity-type block wharf precast block hoisting device and installation method of the present invention.

[0043] Figure 9 yes Figure 1 A magnified view of the local structure at point B.

[0044] Explanation of reference numerals in the attached drawings: 1. Upper beam; 11. Lifting point; 12. Slewing bearing motor; 13. Output gear; 2. Slewing bearing structure; 21. Driven disc; 22. Gear; 3. Lower beam; 4. Slewing device; 5. Lifting rod; 6. Hydraulic telescopic boom; 61. Push arm longitudinal rod; 62. Push arm cross rod; 7. Precast concrete block; 8. Support frame; 81. Moving gear; 82. Sawtooth track. Detailed Implementation

[0045] The following is in conjunction with the appendix Figure 1-9 The present invention will be described in further detail below.

[0046] This invention discloses a gravity-type precast block hoisting device and installation method for a block wharf.

[0047] Reference Figure 1 , 2 5. The lifting beam includes an upper beam 1, a slewing support structure 2 and a lower beam 3. The upper beam 1 is connected to the lower beam 3 through the slewing support structure 2. The slewing support structure 2 and the lower beam 3 are arranged linearly along the central axis below the upper beam 1.

[0048] The lower beam 3 has two internal sliding connections with two transmission components located on both sides of the support structure 2. Each transmission component has two self-locking rotary devices 4 (known technology) fixedly connected to its bottom. The output shaft of each rotary device 4 is connected to a boom 5. The four booms 5 are arranged in pairs, and each group of booms 5 is linearly arranged. Under the control of the crew, the two transmission components can drive the two groups of booms 5 to move simultaneously toward or away from the rotary support structure 2. Under the control of the crew, the two transmission components can also drive the two groups of booms 5 to move in the same direction or in opposite directions respectively. The distance between the two groups of booms 5 and their positions after movement is different from that of the rotary support structure 2. Under the control of the crew, the transmission components can also drive the booms 5 to move in sequence.

[0049] Reference Figure 3 , 4 5. Two hydraulic telescopic arms 6 (known technology) are fixedly connected to both sides of the lower beam 3. The hydraulic telescopic arms 6 can push different precast concrete blocks 7 to align with each other underwater. Each pair of corresponding hydraulic telescopic arms 6 are symmetrically distributed on both sides of the rotary support structure 2, which facilitates the precast concrete blocks 7 to ensure balanced force.

[0050] Reference Figure 1 , 5 9. The lower beam 3 has a groove inside, and a sawtooth track 82 is fixedly connected inside the groove. Each transmission component includes a support frame 8, and a dual-shaft motor is fixedly connected inside each support frame 8. The two output ends of each dual-shaft motor are driven by moving gears 81. The crew controls the start of the dual-shaft motor, which causes the moving gears 81 to rotate. In turn, the moving gears rotate through the meshing of the sawtooth track 82 with the moving gears, thereby changing the distance between the boom 5 and the slewing support structure 2 until the boom 5 moves to the appropriate position. The outer surface of each moving gear 81 meshes with the outer surface of the sawtooth track 82. The top of each boom 5 is fixedly connected to the bottom of the corresponding support frame 8. The boom 5 adopts an L-shaped boom.

[0051] Reference Figure 4 Each hydraulic telescopic boom 6 (known technology) includes a push arm longitudinal rod 61 and a push arm cross rod 62. The outer surface of each push arm cross rod 62 is slidably connected to the interior of the corresponding push arm longitudinal rod 61. The cross rod portion of the corresponding push arm cross rod 62 is in close contact with one side of the precast concrete block 7. Under the push of the push arm cross rod 62, the precast concrete block 7 is moved to one side. At the same time, when all four push arm cross rods 62 are in close contact with the same precast concrete block 7, the precast concrete block 7 can be clamped. When lifting and clamping the precast concrete block 7, all four push arm cross rods 62 are in close contact with the outer surface of the same precast concrete block 7 to prevent the precast concrete block 7 from being blown by the wind at sea and cracking under shaking. The length of the cross rod of the push arm cross rod 62 must exceed the width of the concrete block 7.

[0052] Reference Figure 1 , 4 9. Several lifting points 11 are provided on the top of the upper beam 1. Three rotary support motors 12 are fixedly connected to the top of the upper beam 1. The output shaft of each rotary support motor 12 is connected to an output gear 13. The rotary support structure 2 includes a driven plate 21. The driven plate 21 has teeth 22 inside. The outer surface of each output gear 13 meshes with the outer surface of the teeth 22. The top of the driven plate 21 is rotatably connected to the inside of the upper beam 1, and the bottom of the driven plate 21 is fixedly connected to the inside of the lower beam 3. The rotary support motors 12 control the output gears 13 to rotate. Then, through the meshing of the gears 13 and the teeth 22, the rotary support structure 2 rotates, thereby driving the lower beam 3 and the precast concrete block 7 to rotate, which facilitates the adjustment of the angle of the precast concrete block 7.

[0053] Reference Figure 1 , 7 8. This includes the following operating steps:

[0054] Step A: Establish the underwater installation baseline. An underwater installation baseline is established in advance for positioning reference during block installation. Land-based surveyors lower a steel cable with sufficient weight (plumb bob) from the top of a positioning tower to the bottom of the water. This plumb line transfers the layout points given by the land-based surveyors to the bottom. Divers use the plumb line to mark points by inserting steel bars into the water. The two bottom marks are connected and tightened with a steel cable to form the underwater installation baseline.

[0055] Design and manufacture precast concrete blocks 7. The concrete blocks 7 are rectangular in shape, with protrusions and grooves precast on the upper and lower parts to facilitate improved installation and positioning accuracy and increase the stability of the overall dock structure after installation.

[0056] Step B: The precast concrete block 7 is connected to the lifting beam. After the lifting rod 5 is connected to the precast concrete block 7, the lifting beam is connected to the precast concrete block 7. Then, the floating crane changes the orientation of the precast concrete block 7 by driving the lifting beam to move.

[0057] Step C: The floating crane lifts the lifting beam. The precast concrete blocks 7 and other building materials, the floating crane, other power source devices, and control equipment such as the central control device are all located on the floating crane ship. The slewing support structure 2 is connected to the control equipment. Divers can guide the crew to operate the control equipment and start the slewing support structure 2 and the hydraulic telescopic boom 6 to align and adjust the precast concrete blocks 7.

[0058] Step D: Lower the precast concrete block 7 along the baseline position, and align and install the precast concrete block 7.

[0059] Reference Figure 1 , 6 In step A, the specific construction steps for manufacturing the precast concrete block 7 include:

[0060] A precast concrete block 7 with four lifting holes is constructed. The interior of each lifting hole is adapted to the bottom of the lifting rod 5. Each lifting hole is vertically connected, narrower at the top and wider at the bottom. The precast concrete block 7 is equipped with lifting holes that are adapted to each T-shaped head. During hoisting, the direction of the T-shaped lifting rod is adjusted so that the T-shaped head is aligned with the long side of the lifting hole of the precast block. The lifting rod is lowered, passing through the precast concrete block 7, until the T-shaped head reaches the lower wide space of the lifting hole. Then, the upper rotating device 4 of the T-shaped lifting rod is activated to rotate the lifting rod 90° and "lock" the lifting rod. At this time, the T-shaped lifting rod can stably lift the precast concrete block 7. When it is necessary to lower the precast concrete block 7, the rotating device 4 is unlocked, and the lifting rod is rotated 90° so that the T-shaped head is aligned with the long side of the lifting hole of the precast block. The floating crane drives the lifting rod to rise, which can separate the lifting beam from the precast concrete block 7.

[0061] In step B, the specific construction steps for connecting the precast concrete block 7 to the lifting beam include:

[0062] Start the slewing device 4 and rotate it 90° until the L-shaped head of the boom 5 is aligned with the long side of the lifting hole. The floating crane lifts the lifting beam and lowers it. The boom 5 is lowered into the interior of the lifting hole, passing through the precast concrete block 7. The slewing device 4 rotates 90° and locks itself.

[0063] In step C, the specific construction steps for the floating crane to lift the lifting beam include: each lifting point 11 has a sling inserted inside, the sling is suspended on the hook of the floating crane, and the hook of the floating crane is equipped with a GPS antenna measurement system (known technology).

[0064] Reference Figure 1 , 5 In step D, the specific construction steps for lowering the precast concrete block 7 along the baseline include:

[0065] d1. The floating crane suspends the precast concrete block 7 above the baseline, stops moving the floating crane, and slowly lowers the precast block to the baseline position to form the front block;

[0066] The specific construction steps for aligning and lowering the precast concrete blocks into position include:

[0067] d2. The floating crane suspends other precast concrete blocks 7 on one side of the front precast concrete block to form the rear block. The slewing support structure 2 and each hydraulic telescopic arm 6 are activated to align the front block and the rear block.

[0068] d3. The floating crane suspends the rear block and slowly lowers it to its final position.

[0069] Reference Figure 7 , 8 The specific construction steps for activating the slewing support structure 2 and each hydraulic telescopic boom 6, and aligning the front and rear blocks, include:

[0070] Start the slewing support structure 2 and adjust the angle of the rear block until one side of the rear block is fully aligned and overlapped with one side of the front block.

[0071] In step d2, the specific construction steps for activating the slewing support structure 2 and each hydraulic telescopic arm 6 and aligning the front and rear blocks include: after side adjustment and alignment, activating the hydraulic telescopic arm, pushing the push arm longitudinal rod 61 to push the push arm horizontal rod 62 to be close to the rear block, and pushing the push arm horizontal rod 62 to continue to push two sides of the rear block to be aligned with the two sides corresponding to the front block, so that the rear block and the front block are aligned side by side or parallel.

[0072] The weight of the precast concrete block is transferred to the hook of the floating crane by slings. The boom is inserted into the lifting hole slot of the precast concrete block 7 and bears the weight of the precast concrete block 7. The center of gravity of the suspended block can be obtained through the GPS system. The precast concrete block 7 is slowly lowered. When the side edge or side of the rear block contacts the side of the front block, and the accuracy of the rear block in the land and sea direction and the distance from the installation baseline are within a certain range, the floating crane stops moving.

[0073] Divers, waiting at a safe distance, enter the site and assist with final positioning. Based on the offset of the rear block relative to its designated installation position, the divers guide the crew to activate the slewing support structure 2, thereby adjusting the angle of the rear block to ensure full contact between the rear block and the side of the front block. After side alignment, the divers again guide the crew to activate the hydraulic telescopic boom 6, pushing the rear block towards alignment with the front block, and ensuring alignment via the push arm crossbar. In this way, the rear block can be safely aligned with the front block without any operation by the floating crane operator or crew.

[0074] After the rear block is aligned with the front block, the crane operator will continue to lower the rear block to its final position. The diver will then check the gaps and alignment again. When the diver checks and deems all gaps and offsets satisfactory and within the tolerances of the technical specifications, the lifting beam will be separated from the precast concrete block 7.

[0075] The hydraulic telescopic boom 6 retracts to its original position, the boom 5 rotates to the "unlocked" position, and then the floating crane operator slowly raises the elevator on the crane deck to repeat another installation cycle.

[0076] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A gravity-type precast concrete block hoisting device for a block wharf, characterized in that: The lifting beam includes an upper beam (1), a slewing bearing structure (2), and a lower beam (3). The upper beam (1) is connected to the lower beam (3) through the slewing bearing structure (2). The slewing bearing structure (2) and the lower beam (3) are arranged linearly along the central axis below the upper beam (1). The lifting beam is connected to a precast concrete block (7). The top of the upper beam (1) is provided with several lifting points (11). The top of the upper beam (1) is fixedly connected to three slewing bearing motors (12). The output shaft of each slewing bearing motor (12) is connected to an output gear (13). The slewing bearing structure (2) includes a driven plate (21). The driven plate (21) is provided with teeth (22). The outer surface of each output gear (13) meshes with the outer surface of the teeth (22). The top of the driven plate (21) is rotatably connected to the interior of the upper beam (1). The bottom of the driven plate (21) is fixedly connected to the interior of the lower beam (3). The lower beam (3) has two transmission components that are slidably connected inside, and the two transmission components are located on both sides of the slewing bearing structure (2); the lower beam (3) has a sliding groove inside, and a sawtooth track (82) is fixedly connected inside the sliding groove; each transmission component includes a support frame (8), and a dual-axis motor is fixedly connected inside each support frame (8); the two output ends of each dual-axis motor are driven by a moving gear (81), and the outer surface of each moving gear (81) meshes with the outer surface of the sawtooth track (82); Each of the transmission components is fixedly connected to two self-locking rotary devices (4) at the bottom. Each rotary device (4) has a drive rod (5) at the end of its output shaft. The four rods (5) are arranged in pairs, and each pair of rods (5) is arranged linearly. Two hydraulic telescopic arms (6) are fixedly connected to both sides of the lower beam (3). Each pair of hydraulic telescopic arms (6) are symmetrically distributed on both sides of the slewing bearing structure (2). Each hydraulic telescopic arm (6) includes a push arm longitudinal rod (61) and a push arm cross rod (62). The outer surface of each push arm cross rod (62) is slidably connected to the interior of the corresponding push arm longitudinal rod (61).

2. The gravity-type precast concrete block hoisting device for a block wharf according to claim 1, characterized in that: The top of each of the aforementioned rods (5) is fixedly connected to the bottom of the corresponding support frame (8), and the rods (5) are inverted T-shaped rods.

3. A method for installing precast concrete blocks for a gravity-type block wharf, characterized in that, The installation using the gravity-type precast concrete block hoisting device for the block wharf as described in claim 1 or 2 includes the following steps: Step A: Set up the underwater installation baseline and design and manufacture precast concrete blocks (7). Step B: The precast concrete block (7) is connected to the lifting beam; Step C: The floating crane lifts the lifting beam; Step D: Lower the precast concrete block (7) along the baseline position and align and install the precast concrete block (7).

4. The installation method of precast concrete blocks for gravity-type block wharf according to claim 3, characterized in that, In step A, the specific construction steps for manufacturing the precast concrete blocks (7) include: A precast concrete block (7) with four lifting holes is made, the interior of each of the lifting holes being adapted to the bottom of the lifting rod (5), and each of the lifting holes being through from top to bottom and narrower at the top and wider at the bottom.

5. The installation method of precast concrete blocks for gravity-type block wharf according to claim 4, characterized in that, In step B, the specific construction steps for connecting the precast concrete block (7) to the lifting beam include: Start the slewing device (4) and rotate it 90° until the inverted T-shaped head of the boom (5) is aligned with the long side of the lifting hole. The floating crane lifts the lifting beam and lowers it. The boom (5) is lowered into the interior of the lifting hole and passes through the precast concrete block (7). The slewing device (4) rotates 90° and locks itself. In step C, the specific construction steps for the floating crane to lift the lifting beam include: each lifting point (11) is internally connected to a sling, the sling is suspended on the hook of the floating crane, and the hook of the floating crane is equipped with a GPS antenna measurement system.

6. The installation method of precast concrete blocks for gravity-type block wharf according to claim 4, characterized in that, In step D, the specific construction steps for lowering the precast concrete block (7) along the baseline position include: d1. The floating crane suspends the precast concrete block (7) above the baseline, stops moving the floating crane, and slowly lowers the precast concrete block to the baseline position to form the front block; The specific construction steps for aligning and lowering the precast concrete blocks (7) for installation include: d2. The floating crane suspends other precast concrete blocks (7) on one side of the front precast concrete block to form a rear block, and starts the slewing bearing structure (2) and each hydraulic telescopic arm (6) to align the front block and the rear block. d3. The floating crane slowly lowers the rear block to its final position.

7. The installation method of precast concrete blocks for gravity-type block wharf according to claim 6, characterized in that, In step d2, the specific construction steps for activating the slewing bearing structure (2) and each hydraulic telescopic boom (6) and aligning the front and rear blocks include: Start the slewing bearing structure (2) Adjust the angle of the rear block until one side of the rear block is fully aligned and coincident with one side of the front block.

8. The installation method of precast concrete blocks for gravity-type block wharf according to claim 7, characterized in that, In step d2, the specific construction steps for activating the slewing bearing structure (2) and each hydraulic telescopic arm (6) to align the front block and the rear block include: after the side of the rear block is adjusted and aligned, the hydraulic telescopic arm is activated, and the push arm crossbar (62) is pressed against the rear block until two sides of the rear block are aligned with the corresponding two sides of the front block.

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