A pile-lifting and splicing guide device and construction method for large-diameter pipe piles

Abstract

This invention relates to a pile lifting and splicing guide device for large-diameter pipe piles, comprising a guide device (4) that cooperates with the pile head (3), which includes a first splicing cylinder (41) and a second splicing cylinder (42). The upper half of the first splicing cylinder (41) is higher than the upper half of the second splicing cylinder (42) to form a semi-annular guide hoop (4a), and the lower half forms a complete annular clamp (4b). The two splicing cylinders are connected by a connecting plate (43) and fastening bolts (44). A reinforcing rib (45) is connected between the connecting plate (43) and the splicing cylinder. A steel rope lug (46) is connected to the outer surface of the annular clamp (4b). Each steel rope lug (46) is connected to an automatic clamping device (6), and a clamp tightening device (7) is provided on the annular clamp (4b). The advantages of this invention are that it can lift pipe piles stably and effectively, protect the pile head safely and economically, and smoothly splice the pile quickly and safely, greatly improving the safety and stability of the pipe pile construction process.

Description

Technical Field

[0001] This invention relates to the field of road and bridge construction technology, and in particular to a pile-lifting and splicing guide device and construction method for large-diameter pipe piles. Background Technology

[0002] Prestressed high-strength concrete pipe piles, hereinafter referred to as PHC pipe piles, are hollow reinforced concrete piles formed by prestressing steel bars, high-speed centrifugal molding of the pile body, and high-temperature and high-pressure steam curing. They have advantages such as high pile formation efficiency, small pile defects, high pile strength, and flexible control of pile length, overcoming the disadvantages of bored piles that are prone to defects. However, high-speed railway bridges have high requirements for the bearing capacity of pile foundations, so the application of these small-diameter pipe piles with a bearing capacity of less than 3500kN in high-speed railway bridges is limited. Larger diameter pipe piles are needed to provide higher bearing capacity to meet the needs of large-scale projects.

[0003] PHC pipe piles are prefabricated in the factory and then transported to the construction site. Once on site, they need to be hoisted according to their location. Current on-site hoisting techniques mostly employ two-point lifting or hook lifting. During two-point lifting, improper operation can easily lead to steel cable slippage and breakage, ultimately causing the pipe pile to slip and break, seriously threatening the lives of on-site construction personnel. Hook lifting damages the protective slurry layer on the inner wall of the pipe pile, inevitably causing wear and tear on the pile body and affecting economic and safety benefits. Furthermore, during hammer driving, the pile head lacks protection; due to the repeated impact load of the hammer, the pile head often cracks, breaks, or deforms.

[0004] The large-diameter PHC pipe piles for high-speed railway bridges are over forty meters long in total. Each pipe pile consists of three welded sections. The welding process is significantly affected by human factors. During pile driving, human operation, environment, and geological conditions all influence the verticality of the entire pipe pile. Therefore, workers need to control the verticality using a level. Existing pile splicing devices are not very effective and are rarely used during on-site pile driving due to their complexity. Using machinery for hoisting and welding during pile splicing is inefficient and extremely dangerous.

[0005] In summary, the current construction processes of large-diameter PHC pipe piles, including hoisting, driving, and splicing, present various problems due to factors such as equipment, human operation, environment, and geological conditions. Hoisting processes suffer from issues like steel cable slippage and pipe pile breakage; driving processes are characterized by pile head cracking, damage, or deformation; and splicing processes are characterized by low efficiency and high operational risks. Summary of the Invention

[0006] The purpose of this invention is to solve the problems of high safety risks, easy damage to pile heads, low splicing efficiency, and high risk factor in the existing large-diameter PHC pipe pile hoisting. It provides a pile hoisting and splicing guide device for large-diameter pipe piles, which can stably and effectively hoist the pipe pile, safely and economically protect the pile head, and quickly and safely splice the pile smoothly, greatly improving the safety and stability of the pipe pile construction process.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A pile-joining guide device for large-diameter pipe piles includes a first pipe pile and a second pipe pile to be joined. The pile heads of the first pipe pile and the second pipe pile are respectively connected to guide devices. The guide devices include two semi-circular splicing cylinders, namely a first splicing cylinder and a second splicing cylinder. The two have the same radius and thickness, and the height of the first splicing cylinder is greater than that of the second splicing cylinder. When the first splicing cylinder and the second splicing cylinder are connected to form a cylinder that matches the pile head, the upper half of the first splicing cylinder, which is higher than the second splicing cylinder, forms a semi-circular guide hoop, and the lower half of the cylinder forms a complete annular clamp.

[0009] Both sides of the first and second splicing tubes are fixed with a pair of axially arranged connecting plates. The two connecting plates on the corresponding sides are connected by fastening bolts. A set of triangular reinforcing ribs are connected between the connecting plates and the splicing tubes. A set of steel rope lugs that cooperate with the pile hoisting steel rope are connected to the outer surface of the ring clamp to facilitate stable pile hoisting and splicing.

[0010] Each steel rope lug is connected to an automatic clamping device, and the ring clamp is also equipped with a clamp tightening device to improve the connection strength and stability between the splicing cylinder and the pipe pile.

[0011] Furthermore, the clamp tightening device includes a matching fastening steel rope and a tightening seat. The tightening seat is fixed to one side of the connecting plate and includes a base inside the protective housing. A guide shaft is fixed in the middle of the base, and the outer surface of the guide shaft is provided with an external thread. A locking ratchet is sleeved on the guide shaft, and the middle of the locking ratchet is provided with an internal thread that mates with the external thread. The locking ratchet is connected to the guide shaft through the internal and external threads. A set of external rods is connected to the upper surface of the locking ratchet. The external rods extend out of the protective housing and are connected to a tightening handle. The main body of the locking ratchet is also provided with a through hole, and one side of the through hole is provided with an inclined locking screw hole. The upper end of the locking screw hole passes through the upper surface of the locking ratchet, and the lower end is connected to the through hole. A matching locking screw is connected inside the locking screw hole. The locking screw passes through the upper end of the locking screw hole and extends downward into the through hole. One end of the fastening steel rope is a circular end and the other end is a movable end. The circular end is sleeved on the outside of the connecting rod and is limited by the tightening handle to prevent it from falling off. The movable end is wrapped with a ring clamp and then passes through the through hole of the locking ratchet and is limited by the lower end of the locking screw to prevent it from falling off. A matching limiting pawl is also provided on one side of the locking ratchet. The limiting pawl is connected to a switch outside the protective housing through the pawl shaft to control whether the pawl is engaged with the ratchet.

[0012] Furthermore, the axis of the through hole is set parallel to the axis of the guide shaft, the angle between the axis of the locking screw hole and the axis of the through hole is 30°~40°, and the lower end of the locking screw is set as a bevel end. When the locking screw is screwed into the locking screw hole, the bevel end of the locking screw is parallel to the through hole.

[0013] Furthermore, the inclined end of the locking screw hole is provided with an anti-slip pad to protect the fastening steel rope while increasing the friction and locking force between the steel rope and the locking screw.

[0014] Furthermore, the outer surface of the annular clamp is provided with a continuous annular rope groove. The annular rope groove has an annular opening parallel to its axis. The loose end of the fastening steel rope is inserted into the annular rope groove and wrapped around the annular clamp once. The ratio of the diameter of the annular rope groove to the diameter of the fastening steel rope is 1.2:1 to 1.4:1. The width of the annular opening is smaller than the diameter of the fastening steel rope, so that the steel rope can be embedded in the rope groove while observing the position of the steel rope.

[0015] Furthermore, the protective housing is provided with an opening and closing door, which is positioned directly below the locking ratchet. A limiting hole is provided between the opening and closing door and the protective housing, and the movable end of the fastening steel rope extends into the protective housing through the limiting hole and connects to the through hole of the locking ratchet.

[0016] Furthermore, the automatic clamping device includes a rotating plate and a fan-shaped plate. The annular clamp is provided with a set of connection ports corresponding to the steel rope lugs. The lower end of the steel rope lugs is connected to one side of the rotating plate through a hinge shaft. The rotating plate is located inside the connection port. The other side of the rotating plate is connected to the fan-shaped plate through a fixed shaft. The curvature of the fan-shaped plate is the same as the curvature of the inner wall of the annular clamp, and its thickness gradually decreases from top to bottom. The side of the fan-shaped plate facing the outer wall of the pipe pile is provided with rubber protrusions for secondary clamping of the pipe pile when the lugs are lifted.

[0017] To further achieve the objectives of this invention, a construction method for splicing and connecting large-diameter pipe piles is also provided, the specific steps of which are as follows:

[0018] (1) Assemble the first pipe pile: The guide device is looped around the first pipe pile and fastened by fastening bolts and reinforcing ribs. During assembly, the upper half of the semi-circular guide hoop is flush with the pile head of the first pipe pile, and the lower half of the annular clamp is fastened to the first pipe pile.

[0019] (2) Lifting the first pipe pile: The pile driver lifts the first pipe pile to the design position and places it upright by connecting the pile lifting steel rope to the steel rope lug on the guide device;

[0020] (3) Driving the first pipe pile: The pile driver is connected to the hammer by the pile hoisting steel rope to drive the first pipe pile to the design soil layer, leaving the last meter for splicing.

[0021] (4) Displacement of the guide device: The guide device is unfastened and moved to the pile head of the first pipe pile, so that the lower half of the annular clamp tightly hugs the first pipe pile and is slightly higher than the pile head of the first pipe pile, while the upper half of the semi-annular guide clamp is suspended to cooperate with the smooth guide connection of the second pipe pile.

[0022] (5) Pile splicing: Lift the second pipe pile and guide the first pipe pile to splice. Place the guide device on the second pipe pile and tighten it with the fastening bolts and triangular reinforcing bars. The pile driver is connected to the steel rope lug on the guide device through the pile lifting steel rope and lifted to the upper right of the first pipe pile. Move it to the left to the semi-circular guide hoop at the upper part of the first pipe pile. After alignment, lower it into the lower half of the annular clamp to complete the pipe pile guidance splicing.

[0023] (6) Disassembly and finishing: Disassemble the guide device, weld the first pipe pile and the second pipe pile to complete the pile splicing.

[0024] Further, in step (1), after the fastening bolts secure the guide device to the first pipe pile, the circular end of the fastening steel rope is fitted under the tightening handle of the locking seat, and the movable end is inserted into the annular rope groove of the ring clamp. After passing through the rope groove, it extends into the through hole of the locking ratchet and then out. Then, the locking screw is screwed into the locking screw hole until the lower end of the locking screw extends into the through hole and contacts the fastening steel rope and squeezes the space, so that the fastening steel rope is fixed in the through hole. Then, the locking ratchet can be rotated clockwise using the tightening handle, and at the same time, the switch is turned to make the limiting pawl contact and engage with the locking ratchet, so that the locking ratchet can only rotate clockwise. When the locking ratchet rotates upward along the guide shaft, it drives the fastening steel rope to tighten and wrap around the lower half of the guide shaft, thereby locking the ring clamp a second time.

[0025] Furthermore, in step (2), when the steel rope lug is lifted upward, the automatic clamping device connected to the steel rope lug begins to act on the internal pipe pile. The rotating plate is pulled from a horizontal state to an upward tilting state, causing the fan-shaped plate on the inner side of the annular clamp to deflect at an angle towards the pipe pile side, thereby generating an inward squeezing force on the outer surface of the pipe pile. At the same time, the squeezing of the fan-shaped plate and the rubber protrusions on its inner side increase the friction between the annular clamp and the pipe pile, thereby performing secondary tightening of the pipe pile.

[0026] Compared with the prior art, the advantages of the technical solution of the present invention are as follows:

[0027] (1) The guiding device of the present invention can be used for multiple purposes. It can not only lift pipe piles stably and effectively, but also protect the pile head safely and economically. At the same time, it can quickly and safely connect the piles smoothly. The device is simple to manufacture and easy to operate, which greatly improves the safety and stability of the pipe pile construction process.

[0028] (2) Compared with the traditional two-point lifting method for pipe piles, the structure of the present invention is more stable. The six lugs on the device can be well connected with the lifting steel rope to bear the weight of the pipe pile, avoiding problems such as steel rope slippage, steel rope breakage, and pipe pile slippage that may occur in two-point lifting. The entire lifting process is safer and more reliable.

[0029] (3) Compared with the traditional method of lifting pipe piles by hook, the device of the present invention tightly hooks the pipe pile during the lifting process, effectively protecting the pipe pile and avoiding damage to the protective layer of the inner wall of the pipe pile caused by directly lifting the pile with hook. The entire lifting process provides more complete protection for the pipe pile body.

[0030] (4) When assembling the present invention during the hammer driving process, the upper half of the semi-circular guide hoop is flush with the pile head, and the lower half of the annular clamp is tightly fastened to the first pipe pile. The annular clamp plays a certain role in protecting the pile head, avoiding the pile head cracking or deformation caused by the impact load of the heavy hammer.

[0031] (5) During the assembly of the present invention in the process of guiding pile splicing, the guiding device is unfastened and moved to the pile head of the first pipe pile. The upper half of the semi-circular guiding hoop is suspended in the air. The second pipe pile is lifted to the upper right of the first pipe pile, moved to the left to the upper half of the semi-circular guiding hoop, aligned and lowered into the lower half of the annular clamp. The semi-circular structure design can better cooperate with the second pipe pile to quickly and smoothly guide the pile splicing and improve the splicing efficiency.

[0032] (6) During the assembly process of the guide pile splicing, the guide device is unfastened and moved to the head of the first pipe pile, so that the lower half of the ring clamp tightly hugs the first pipe pile and is slightly higher than the head of the first pipe pile. The second pipe pile is lifted to the upper right of the first pipe pile and moved to the left to the upper half of the semi-circular guide clamp. After alignment, it is lowered into the lower half of the ring clamp. The lower half of the ring clamp is slightly higher than the head of the first pipe pile, which makes it easier to align and lower the pipe pile and also better control the verticality of the splicing. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the pile lifting and splicing guide device for large-diameter pipe piles according to the present invention.

[0034] Figure 2 This is a top view of the guiding device of the present invention;

[0035] Figure 3 This is a front view of the guiding device of the present invention;

[0036] Figure 4 This is a schematic diagram of the disassembly and reassembly of the splicing tube of the present invention;

[0037] Figure 5 This is a schematic diagram of the pile lifting process of the present invention;

[0038] Figure 6 This is a schematic diagram of the pile driving process of the present invention;

[0039] Figure 7 This is a schematic diagram of the guiding pile connection process of the present invention;

[0040] Figure 8 This is a schematic diagram of the guide device structure in this embodiment;

[0041] Figure 9 for Figure 8 A magnified view of part A;

[0042] Figure 10 This is an external structural diagram of the clamp tightening device in this embodiment;

[0043] Figure 11 This is a front view of the internal structure of the clamp tightening device in this embodiment;

[0044] Figure 12 This is a top view of the internal structure of the clamp tightening device in this embodiment;

[0045] Figure 13 This is a schematic diagram showing the fit between the locking screw hole and the locking screw in this embodiment;

[0046] Figure 14 This is a three-dimensional structural diagram of the automatic clamping device in this embodiment;

[0047] Figure 15 This is a schematic diagram of the internal structure of the automatic clamping device in this embodiment;

[0048] Figure 16 This is a diagram showing the distribution of the automatic clamping device on the annular clamp in this embodiment;

[0049] Figure 17 This is a flowchart of the pile splicing construction method for large-diameter pipe piles according to the present invention. Detailed Implementation Example

[0050] To make the present invention clearer, the following description, in conjunction with the accompanying drawings, further illustrates a pile-lifting and splicing guidance device and construction method for large-diameter pipe piles. The specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0051] See Figures 1-4 and Figures 5-7 A pile-joining guide device for large-diameter pipe piles includes a first pipe pile 1 and a second pipe pile 2 to be joined, wherein the pile heads 3 of the first pipe pile 1 and the second pipe pile 2 are respectively connected to guide devices 4, characterized in that:

[0052] The guide device 4 includes two semi-circular splicing cylinders, namely the first splicing cylinder 41 and the second splicing cylinder 42. The two have the same radius and thickness, and the height of the first splicing cylinder 41 is greater than that of the second splicing cylinder 42. When the first splicing cylinder 41 and the second splicing cylinder 42 are connected to form a cylinder that matches the pile head 3, the upper part of the first splicing cylinder 41, which is higher than the second splicing cylinder 42, forms a semi-annular guide hoop 4a, and the lower part of the cylinder forms a complete annular clamp 4b.

[0053] A pair of axially arranged connecting plates 43 are fixed on both sides of the first splicing tube 41 and the second splicing tube 42. The two connecting plates 43 on the corresponding sides are connected by fastening bolts 44. A set of triangular reinforcing ribs 45 are connected between the connecting plate 43 and the splicing tube. A set of steel rope lugs 46 that cooperate with the pile hoisting steel rope 5 are connected to the outer surface of the ring clamp 4b to facilitate stable pile hoisting and splicing.

[0054] Each steel rope lug 46 is connected to an automatic clamping device 6, and the annular clamp 4b is also equipped with a clamp tightening device 7 to improve the connection strength and stability between the splicing tube and the pipe pile.

[0055] See Figure 8 , Figures 10-12 The clamp tightening device 7 includes a fastening steel rope 71 and a tightening seat 72. The tightening seat 72 is fixed to one side of the connecting plate 43. It includes a base 721 located inside the protective housing 720. The base 721 has a conical structure. A guide shaft 722 is fixed in the middle. The outer surface of the guide shaft 722 is provided with an external thread 722a. A locking ratchet 723 is sleeved on the guide shaft 722. The middle part of the locking ratchet 723 is provided with an internal thread 723a that matches the external thread 722a. The locking ratchet 723 is connected to the guide shaft 722 through the internal and external threads. A set of external rods 724 are connected to the upper surface of the locking ratchet 723. The external rods 724 extend out of the protective housing 720 and are connected to the tightening handle 725.

[0056] See Figure 10 , 11 12 and 13, the main body of the locking ratchet 723 is also provided with a through hole 723b. The axis of the through hole 723b is set parallel to the axis of the guide shaft 722. An inclined locking screw hole 723c is provided on one side of the through hole 723b. The upper end of the locking screw hole 723c passes through the upper surface of the locking ratchet 723, and the lower end is connected to the through hole 723b. The angle between the axis of the locking screw hole 723c and the axis of the through hole 723b is 30°.

[0057] A locking screw 726 is connected inside the locking screw hole 723b. The locking screw 726 passes through the upper end of the locking screw hole 723c and extends downward into the through hole 723b. The lower end of the locking screw 726 is set as a bevel end 726a, and its bevel end 726a is provided with an anti-slip pad 726b. When the locking screw 726 is screwed into the locking screw hole 723c, the bevel end 726a of the locking screw 726 is parallel to the through hole 723b.

[0058] One end of the fastening steel rope 71 is a circular end 71a and the other end is a loose end 71b. The circular end 71a is sleeved on the outer rod 724 and is limited by the tightening handle 725 to prevent it from slipping off.

[0059] See Figure 8 , 9 10 and 11, the outer surface of the annular clamp 4b is provided with a continuous annular rope groove 8, the annular rope groove 8 is provided with an annular opening 8a parallel to its axis, the live end 71b of the fastening steel rope 71 is inserted into the annular rope groove 8 and wrapped around the annular clamp 4b once, the ratio of the diameter of the annular rope groove 8 to the diameter of the fastening steel rope 71 is 1.2:1, the width of the annular opening 8a is smaller than the diameter of the fastening steel rope 71, so that the steel rope can be embedded in the rope groove while observing the position of the steel rope;

[0060] The protective housing 720 is provided with an opening and closing door 7201, which is located directly below the locking ratchet 723. A limiting hole 720a is provided between the opening and closing door 7201 and the protective housing 720. The movable end 71b of the fastening steel rope 71 extends into the protective housing 720 through the limiting hole 720a and is connected to the through hole 723b of the locking ratchet 723. It is limited by the lower end of the locking screw 726 to prevent it from falling off.

[0061] See Figure 10 , 11 12. On one side of the locking ratchet 723, there is also a corresponding limiting pawl 727. The limiting pawl 727 is connected to the switch 729 outside the protective housing 720 through the pawl shaft 728, so as to control whether the pawl is engaged with the ratchet through the switch.

[0062] See Figure 14 , 15 16. The automatic clamping device 6 includes a rotating plate 61 and a fan-shaped piece 62. The annular clamp 4b is provided with a set of connection ports 11 corresponding to the steel rope lugs 46. The lower end of the steel rope lugs 46 is connected to one side of the rotating plate 61 through a hinge shaft 63. The rotating plate 61 is located inside the connection port 11. The other side of the rotating plate 61 is connected to the fan-shaped piece 62 through a fixed shaft 64. The curvature of the fan-shaped piece 62 is the same as the curvature of the inner wall of the annular clamp 4b, and its thickness gradually decreases from top to bottom. The side of the fan-shaped piece 62 facing the outer wall of the pipe pile is provided with rubber protrusions 621 for secondary clamping of the pipe pile when the lugs are lifted.

[0063] See Figure 5 , 6 The construction method for lifting and splicing large-diameter pipe piles using the aforementioned guiding device, as described in points 7 and 17, comprises the following steps, characterized by including:

[0064] (1) Assemble the first pipe pile: The guide device 4 ring is put on the first pipe pile 1 and is fastened by the fastening bolt 44 and the reinforcing rib 45. During assembly, the upper half of the semi-circular guide hoop 4a is flush with the pile head of the first pipe pile 1, and the lower half of the annular clamp 4b is fastened to the first pipe pile 1.

[0065] (2) Secondary tightening of the clamp: The circular end 71a of the fastening steel rope 71 is fitted under the tightening handle 725 of the locking seat 72, and the movable end 71b is inserted into the annular rope groove 8 of the annular clamp 4b. After passing through the rope groove, it extends into the through hole 723b of the locking ratchet 723 and then out. Then, the locking screw 726 is screwed into the locking screw hole 723c until the lower end of the locking screw 726 extends into the through hole 723b and contacts the fastening steel rope 71, compressing the space, so that... Once the fastening steel rope 71 is fixed inside the through hole 723b, the ratchet 723 can be locked by rotating the tightening handle 725 clockwise. At the same time, the switch 729 is activated to make the limit pawl 727 engage with the locking ratchet 723, so that the locking ratchet 723 can only rotate clockwise. When the locking ratchet 723 rotates upward along the guide shaft 722, it drives the fastening steel rope 71 to tighten and wrap around the lower half of the guide shaft 722, thereby locking the annular clamp 4b a second time.

[0066] (3) Lifting the first pipe pile: The pile driver 9 is connected to the steel rope lug 46 on the guide device 4 through the pile lifting steel rope 5, and the first pipe pile 1 is lifted to the design position and placed upright;

[0067] (4) Secondary fastening of pipe pile: When the steel rope lug 46 is lifted upward, the automatic clamping device 6 connected to the steel rope lug 46 begins to act on the internal pipe pile. The rotating plate 61 is pulled from the horizontal state to the upward tilting state, which drives the fan-shaped plate 62 on the inner side of the ring clamp 4b to deflect at an angle towards the pipe pile side, thereby generating an inward squeezing force on the outer surface of the pipe pile. At the same time, the squeezing of the fan-shaped plate 62 and the rubber protrusion 621 on its inner side increase the friction between the ring clamp and the pipe pile, thereby performing secondary fastening of the pipe pile.

[0068] (5) Driving the first pipe pile: The pile driver 6 is connected to the hammer 10 through the pile lifting steel rope 5 to drive the first pipe pile 1 to the design soil layer, leaving the last meter for splicing.

[0069] (6) Displacement of the guide device: The guide device 4 is unfastened and moved to the pile head of the first pipe pile 1, so that the lower half of the annular clamp 4b tightly hugs the first pipe pile 1 and is slightly higher than the pile head of the first pipe pile 1, while the upper half of the semi-annular guide clamp 4a is suspended to cooperate with the smooth guide connection of the second pipe pile 2.

[0070] (7) Pile splicing: The second pipe pile 2 is lifted and the first pipe pile 1 is guided to splice. The guide device 4 is looped around the second pipe pile 2 and fastened by the fastening bolt 44 and the triangular reinforcing rib 45. The pile driver 9 is connected to the steel rope lug 46 on the guide device 4 through the pile lifting steel rope 5. It is lifted to the upper right of the first pipe pile 1 and moved to the left to the semi-circular guide hoop 4a at the upper part of the first pipe pile 1. After alignment, it is lowered into the lower half of the annular clamp 4b, thus completing the pipe pile guiding splicing.

[0071] (8) Disassembly and finishing: Disassemble the guide device 4 and the clamp tightening device 7, weld the first pipe pile 1 and the second pipe pile 2 to complete the pile connection.

[0072] The device of the present invention has a wide range of applications and can be used for pipe pile hoisting, pile driving and pile splicing. It effectively protects the pile head, improves the efficiency of pile splicing, and greatly enhances the safety and stability of pipe pile construction.

[0073] In addition to the embodiments described above, the present invention may have other implementations. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A pile-joining guide device for large-diameter pipe piles, comprising a first pipe pile (1) and a second pipe pile (2) to be joined, wherein the pile heads (3) of the first pipe pile (1) and the second pipe pile (2) are respectively connected to guide devices (4), characterized in that: The guiding device (4) includes two semi-circular splicing cylinders, namely the first splicing cylinder (41) and the second splicing cylinder (42). The two have the same radius and thickness, and the height of the first splicing cylinder (41) is greater than that of the second splicing cylinder (42). When the first splicing cylinder (41) and the second splicing cylinder (42) are connected to form a cylinder that matches the pile head (3), the upper part of the first splicing cylinder (41) is higher than the upper part of the second splicing cylinder (42) to form a semi-circular guide hoop (4a), and the lower part of the cylinder forms a complete annular clamp (4b). A pair of connecting plates (43) arranged along the axial direction are fixed on both sides of the first splicing tube (41) and the second splicing tube (42). The two connecting plates (43) on the corresponding sides are connected by fastening bolts (44). A set of triangular reinforcing ribs (45) are connected between the connecting plate (43) and the splicing tube. A set of steel rope lugs (46) that cooperate with the steel rope (5) of the hoisting pile are connected to the outer surface of the ring clamp (4b). Each steel rope lug (46) is connected to an automatic clamping device (6), and the ring clamp (4b) is also equipped with a clamp tightening device (7). The clamp tightening device (7) includes a matching fastening steel rope (71) and a tightening seat (72). The tightening seat (72) is fixed to one side of the connecting plate (43). It includes a base (721) located inside the protective housing (720). A guide shaft (722) is fixed in the middle of the base (721). The outer surface of the guide shaft (722) is provided with an external thread (722a). A locking ratchet (723) is fitted on the guide shaft (722). The middle of the locking ratchet (723) is provided with a locking ratchet (723). The locking ratchet (723) has an internal thread (723a) that mates with the external thread (722a). The locking ratchet (723) is connected to the guide shaft (722) through the internal and external threads. A set of external rods (724) are connected to the upper surface of the locking ratchet (723). The external rods (724) extend out of the protective housing (720) and are connected to a tightening handle (725). The main body of the locking ratchet (723) is also provided with a through hole (723b). An inclined lock is provided on one side of the through hole (723b). The upper end of the locking screw hole (723c) passes through the upper surface of the locking ratchet (723), and the lower end is connected to the through hole (723b). A matching locking screw (726) is connected inside the locking screw hole (723c). The locking screw (726) passes through the upper end of the locking screw hole (723c) and extends downward into the through hole (723b). One end of the fastening steel rope (71) is set as a ring end (71a), and the other end is set as a movable end (71b). The ring end ( 71a) It is sleeved on the outside of the external rod (724) and is limited by the tightening handle (725) to prevent it from falling off. The movable end (71b) is wrapped with the ring clamp (4b) and then inserted into the through hole (723b) of the locking ratchet (723) and is limited by the lower end of the locking screw (726) to prevent it from falling off. A matching limiting pawl (727) is also provided on one side of the locking ratchet (723). The limiting pawl (727) is connected to the switch (729) outside the protective housing (720) through the pawl shaft (728). The automatic clamping device (6) includes a rotating plate (61) and a fan-shaped piece (62). The annular clamp (4b) is provided with a set of connection ports (11) corresponding to the steel rope lugs (46). The lower end of the steel rope lugs (46) is connected to one side of the rotating plate (61) through a hinge shaft (63). The rotating plate (61) is located in the connection port (11). The other side of the rotating plate (61) is connected to the fan-shaped piece (62) through a fixed shaft (64). The curvature of the fan-shaped piece (62) is the same as the curvature of the inner wall of the annular clamp (4b), and its thickness gradually decreases from top to bottom. The side of the fan-shaped piece (62) facing the outer wall of the pipe pile is provided with rubber protrusions (621).

2. The pile lifting and splicing guide device for large-diameter pipe piles according to claim 1, characterized in that: The axis of the through hole (723b) is set parallel to the axis of the guide shaft (722). The angle between the axis of the locking screw hole (723c) and the axis of the through hole (723b) is 30°~40°. The lower end of the locking screw (726) is set as the inclined end (726a). When the locking screw (726) is screwed into the locking screw hole (723c), the inclined end (726a) of the locking screw (726) is parallel to the through hole (723b).

3. The pile lifting and splicing guide device for large-diameter pipe piles according to claim 2, characterized in that: The inclined end (726a) of the locking screw (726) is provided with an anti-slip pad (726b).

4. The pile lifting and splicing guide device for large-diameter pipe piles according to any one of claims 1 to 3, characterized in that: The outer surface of the annular clamp (4b) is provided with a continuous annular rope groove (8). The annular rope groove (8) has an annular opening (8a) parallel to its axis. The live end (71b) of the fastening steel rope (71) passes into the annular rope groove (8) and wraps around the annular clamp (4b) once. The ratio of the diameter of the annular rope groove (8) to the diameter of the fastening steel rope (71) is 1.2:1 to 1.4:

1. The width of the annular opening (8a) is smaller than the diameter of the fastening steel rope (71).

5. The pile lifting and splicing guide device for large-diameter pipe piles according to claim 4, characterized in that: The protective housing (720) is provided with an opening and closing door (7201), which is located directly below the locking ratchet (723). A limiting hole (720a) is provided between the opening and closing door (7201) and the protective housing (720). The movable end (71b) of the fastening steel rope (71) extends into the protective housing (720) through the limiting hole (720a) and connects to the through hole (723b) of the locking ratchet (723).

6. A construction method for splicing large-diameter pipe piles using the device described in claim 5, comprising the following specific steps, characterized in that: Step 1, assemble the first pipe pile (1): put the guide device (4) around the first pipe pile (1) and fix it tightly with fastening bolts (44) and reinforcing ribs (45). During assembly, the upper half of the semi-circular guide hoop (4a) is flush with the pile head of the first pipe pile (1), and the lower half of the annular clamp (4b) is tightly fastened to the first pipe pile (1). Step 2, hoisting the first pipe pile (1): The pile driver (9) is connected to the steel rope lug (46) on the guide device (4) through the pile hoisting steel rope (5) to hoist the first pipe pile (1) to the design position and place it upright; Step 3, driving the first pipe pile (1): The pile driver (9) is connected to the hammer (10) through the pile hoisting steel rope (5) to drive the first pipe pile (1) to the design soil layer, leaving the last meter for splicing; Step 4, guide device (4) relocation: unfasten the guide device (4) and move it to the pile head of the first pipe pile (1), so that the lower half of the annular clamp (4b) tightly hugs the first pipe pile (1) and is slightly higher than the pile head of the first pipe pile (1), and the upper half of the semi-annular guide clamp (4a) is suspended to cooperate with the smooth guide connection of the second pipe pile (2). Step 5, Pile Connection: Lift the second pipe pile (2) and guide the connection between it and the first pipe pile (1). Place the guide device (4) around the second pipe pile (2) and fasten it with the fastening bolt (44) and the triangular reinforcing rib (45). The pile driver (9) is connected to the steel rope lug (46) on the guide device (4) through the pile lifting steel rope (5). Lift it to the upper right of the first pipe pile (1), move it to the left to the semi-circular guide hoop (4a) at the upper part of the first pipe pile (1), align it and lower it into the lower half of the annular clamp (4b). The pipe pile connection is then completed. Step 6, dismantling and finishing: dismantle the guide device (4), weld the first pipe pile (1) and the second pipe pile (2) to complete the pile connection.

7. The construction method for splicing and lifting large-diameter pipe piles according to claim 6, characterized in that: In step one, after the fastening bolt (44) secures the guide device (4) to the first pipe pile (1), the annular end (71a) of the fastening steel rope (71) is fitted under the tightening handle (725) of the locking seat (72), and the movable end (71b) is inserted into the annular rope groove (8) of the annular clamp (4b), passes out from the rope groove, and then extends into the through hole (723b) of the locking ratchet (723) and out. Then, the locking screw (726) is screwed into the locking screw hole (723c) until the lower end of the locking screw (726) extends into the through hole (723b) and is fastened. The steel rope (71) contacts and compresses the space, so that the fastening steel rope (71) is fixed in the through hole (723b). The locking ratchet (723) can be locked by rotating the tightening handle (725) clockwise. At the same time, the switch (729) is turned to make the limiting pawl (727) contact and engage with the locking ratchet (723), so that the locking ratchet (723) can only rotate clockwise. When the locking ratchet (723) rotates upward along the guide shaft (722), it drives the fastening steel rope (71) to tighten and wrap around the lower half of the guide shaft (722), thereby locking the ring clamp (4b) a second time.

8. The construction method for lifting and splicing large-diameter pipe piles according to claim 6, characterized in that: In step two, when the steel rope lug (46) is lifted upward, the automatic clamping device (6) connected to the steel rope lug (46) begins to act on the internal pipe pile. The rotating plate (61) is pulled from a horizontal state to an upward tilting state, causing the fan-shaped plate (62) on the inner side of the annular clamp (4b) to deflect at an angle towards the pipe pile, thereby generating an inward squeezing force on the outer surface of the pipe pile. At the same time, the squeezing of the fan-shaped plate (62) and the rubber protrusion (621) on its inner side increase the friction between the annular clamp (4b) and the pipe pile, thereby tightening the pipe pile a second time.

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