CN212151328U

CN212151328U - Precast pile lifting appliance

Info

Publication number: CN212151328U
Application number: CN202020442047.4U
Authority: CN
Inventors: 周兆弟
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2020-12-15
Anticipated expiration: 2030-03-31

Abstract

The utility model provides a precast pile lifting appliance, which comprises a lifting beam and at least two gripping mechanisms, wherein the lifting beam is controlled by a hoisting device to perform actions such as lifting, translation and the like, and the gripping mechanisms are distributed on the lifting beam at intervals along the longitudinal direction for gripping precast piles; the gripping mechanism comprises a gripping component and a gripping driving mechanism, the gripping component is provided with two movable gripping bodies which are arranged in sequence along the transverse direction, and the gripping driving mechanism can drive at least one movable gripping body to approach or depart from the other movable gripping body; like this, through setting up two at least grabbing mechanism, can be favorable to precast pile hoist to lift by crane the security and the stability of process.

Description

Precast pile lifting appliance

Technical Field

The utility model belongs to building construction equipment field, concretely relates to precast pile hoist.

Background

Along with the vigorous development of the building industry, the precast concrete precast pile with high construction speed becomes a concrete product with larger demand in precast components in China. At present, a batch of precast concrete piles are generally precast in a factory in advance, and then the precast concrete piles are conveyed to a construction site by uniformly adopting a conveying tool, so that the precast concrete piles are stacked after being produced and formed, and the stacked precast concrete piles are moved to the conveying tool in the process of moving the stacked precast concrete piles to the conveying tool, and the precast concrete piles are moved by using a lifting tool. The traditional lifting appliance generally adopts steel wire rope binding, then the concrete precast pile is moved to a specified position, the binding is not easy to control by the method, the problems of steel wire rope sliding and abrasion breakage are easily caused, great potential safety hazards are brought to the lifting work, and the steel wire rope binding and lifting are time-consuming and labor-consuming.

Therefore, a large number of concrete precast pile lifting appliances have been developed, for example, in the prior art, a precast pile lifting appliance includes a gripper including a first gripper and a second gripper, both of which are arc-shaped; the upper ends of the first gripper and the second gripper are hinged through a connecting shaft, the lower ends of the first gripper and the second gripper are separated from each other, and the arc-shaped openings are oppositely arranged; and the locking mechanism is arranged on the first gripper and the second gripper and used for locking and unlocking the first gripper and the second gripper. Above-mentioned hoist blocks the precast pile through the tongs and carries out hoist and mount work, can reduce the precast pile landing for hoist and mount work is safe and reliable relatively. However, during use it was found that: due to the fact that the size and the shape of the hand grip are determined, the requirement for hoisting precast piles of different sizes and pile shapes is difficult to meet; and because only one group of grippers is used for grabbing the precast pile, the stability of the hoisting process is difficult to ensure.

Therefore, the existing precast pile lifting appliance obviously still has inconvenience and defects in structure and use, and therefore, a stable and safe precast pile lifting appliance mode needs to be found.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a stable, safe precast pile hoist.

For solving the above technical problem, the utility model provides a precast pile hoist, include: the device comprises a hanging beam controlled by hoisting equipment and at least two gripping and clamping mechanisms distributed on the hanging beam at intervals along the longitudinal direction; the grabbing and clamping mechanism comprises grabbing and clamping components and grabbing and clamping driving mechanisms, the grabbing and clamping components are provided with two movable grabbing and clamping bodies which are arranged in sequence along the transverse direction, and the grabbing and clamping driving mechanisms can drive at least one movable grabbing and clamping body to be close to or far away from the other movable grabbing and clamping body.

Furthermore, the gripping mechanism further comprises an adjustable mounting seat, and the adjustable mounting seat is mounted on the lifting beam and integrates the gripping assembly and the gripping driving mechanism.

Furthermore, the movable type grabbing clamp body comprises a clamping plate, a sliding piece capable of sliding along the adjustable mounting seat is arranged at the top of the clamping plate, and the clamping plate is connected with the adjustable mounting seat in a sliding mode through the sliding piece.

Furthermore, the sliding part is provided with a sliding groove, and the adjustable mounting seat is provided with a sliding rail matched with the sliding groove so as to be matched with the sliding part to move on the adjustable mounting seat; or the adjustable mounting seat is provided with a sliding groove, and the sliding piece is provided with a sliding rail matched with the sliding groove so as to be matched with the sliding piece to move on the adjustable mounting seat.

Furthermore, the gripping and clamping driving mechanism is installed on the adjustable installation seat and comprises a driving portion and a transmission portion, the transmission portion is fixedly installed with the sliding piece of the movable gripping and clamping body, and the driving portion can drive the sliding piece to move along the adjustable installation seat through the transmission portion so as to drive the movable gripping and clamping body to move.

Furthermore, the movable grabbing clamp body also comprises a hanging rod, the hanging rod is provided with lifting hooks, the lifting hooks are fixedly arranged at the bottom of the hanging rod, any two lifting hooks are approximately positioned at the same height, and preferably, the lifting hooks and the hanging rod are integrally arranged;

preferably, the contact surface of the lifting hook and the precast pile is provided with an anti-slip pad;

preferably, the hooks are wedge-shaped.

Further, the jib is installed in the vertical both sides of splint, and splint and slider set up the first through-hole and the second through-hole that supply the jib to pass respectively, and the jib can be in first through-hole and second through-hole free rotation.

Furthermore, the grabbing and clamping mechanism further comprises a driving mechanism in transmission connection with the hanging rod through a connecting arm, the driving mechanism is installed on the sliding part, and the driving mechanism can drive the connecting arm to deflect so as to drive the hanging rod to rotate around the central axis of the hanging rod.

Furthermore, the driving mechanism is a telescopic oil cylinder or an air cylinder, and a telescopic rod of the telescopic oil cylinder or the air cylinder is in transmission connection with the suspender through a connecting arm.

Furthermore, the suspender comprises a first telescopic rod and a second telescopic rod, the second telescopic rod is movably sleeved on the first telescopic rod, the first telescopic rod can axially move along the second telescopic rod, and a limiting structure for preventing the first telescopic rod from being separated from the second telescopic rod is arranged between the first telescopic rod and the second telescopic rod.

Compared with the prior art, the precast pile lifting appliance provided by the utility model comprises a lifting beam and at least two gripping mechanisms, wherein the lifting beam is controlled by a hoisting device to perform actions such as lifting, translation and the like, and the gripping mechanisms are distributed on the lifting beam at intervals along the longitudinal direction for gripping precast piles; the gripping mechanism comprises a gripping component and a gripping driving mechanism, the gripping component is provided with two movable gripping bodies which are arranged in sequence along the transverse direction, and the gripping driving mechanism can drive at least one movable gripping body to approach or depart from the other movable gripping body; like this, through the grab clamp mechanism that two at least intervals set up, can be favorable to precast pile hoist to lift by crane the security and the stability of process.

Drawings

Fig. 1 is a schematic structural diagram of a precast pile spreader in an embodiment of the present invention;

fig. 2 is a schematic structural view of a gripping mechanism according to an embodiment of the present invention;

FIG. 3 is a schematic structural view of the gripper driving mechanism according to the embodiment of the present invention;

FIG. 4 is a schematic structural view of one embodiment of a gripper assembly in an embodiment of the present invention;

fig. 5 is a schematic structural view of a precast pile hoisted by a precast pile sling in an embodiment of the present invention;

figure 6 is a schematic structural view of yet another embodiment of a gripper assembly in an embodiment of the present invention.

In the drawings:

1. a hanging beam; 11. a sliding guide rail;

100. a precast pile lifting appliance;

2. a gripping mechanism; 21. a gripper assembly; 211. a movable grasping body; 212. a splint; 2121. a slider; 2122. a chute; 213. a boom; 2131. a hook; 2132. a first telescopic rod; 2133. a second telescopic rod; 22. a gripper drive mechanism; 221. a drive section; 222. a transmission section; 2221. a connecting seat; 23. an adjustable mounting seat; 231. a slider; 232. a slide rail; 24. a drive mechanism; 241. a connecting arm;

200. and (6) prefabricating the pile.

Detailed Description

In order to facilitate understanding of the technical solutions of the present invention, the following detailed description is made with reference to the accompanying drawings and specific embodiments.

< example one >

With reference to fig. 1, 2, 4 and 5, the present embodiment provides a precast pile spreader 100, the precast pile spreader 100 comprising: the precast pile driving device comprises a hanging beam 1 and three grabbing and clamping mechanisms 2, wherein the hanging beam 1 is controlled by hoisting equipment (such as a crane, a traveling crane, a wharf crane and the like) and can perform lifting, translation and other actions, and the three grabbing and clamping mechanisms 2 are longitudinally distributed on the hanging beam 1 at intervals and are used for grabbing and clamping precast piles; of course, the utility model provides a precast pile hoist 100 sets up at least two or more grab clamp mechanisms 2 can. Thus, by arranging at least two gripping and clamping mechanisms 2, the weight can be uniformly distributed according to the length of the precast pile 200, and the safety and the stability of the precast pile lifting appliance 100 in the lifting process are facilitated; the gripping mechanism 2 comprises a gripping component 21, a gripping driving mechanism 22 and an adjustable mounting seat 23, the adjustable mounting seat 23 is mounted on the lifting beam 1, and the gripping component 21 and the gripping driving mechanism 22 are integrated; the gripping and clamping driving mechanism 22 can drive the gripping and clamping assembly 21 to grip and clamp the precast pile.

For the convenience of subsequent understanding, "longitudinal" is defined as a direction parallel to the length direction of the precast pile 200 when the precast pile spreader 100 grips the precast pile 200; "transverse" is defined as a direction perpendicular to the longitudinal direction.

Specifically, the gripper assembly 21 and the gripper driving mechanism 22 are integrated into the adjustable mounting seat 23 and slidably connected to the suspension beam 1 through the adjustable mounting seat 23, and the adjustable mounting seat 23 can drive the gripper assembly 21 to approach and/or move away from each other. Set up like this, can slide along hanging beam 1 through adjustable mount pad 23 to drive and grab clamp subassembly 21 and remove, with the distance between the adjustment grab clamp subassembly 21, thereby with wait to lift by crane precast pile length looks adaptation, and then be favorable to improving the commonality of hoist.

Preferably, in this embodiment, the precast pile spreader 100 includes three gripping and clamping mechanisms 2 distributed at intervals along the longitudinal direction of the suspension beam 1, a gripping and clamping assembly 21 is installed below each adjustable installation seat 23, the length direction of the adjustable installation seat 23 is approximately perpendicular to the length direction of the suspension beam 1, the adjustable installation seat 23 has two symmetrically arranged sliders 231, the suspension beam 1 has sliding rails 11 corresponding to the number and the positions of the sliders, and the sliders 231 can slide back and forth along the sliding rails 11, so as to drive the gripping and clamping assemblies 21 to approach and/or move away from each other, so as to adjust the slider 2121 to a position suitable for lifting a precast pile, so as to adapt to the length dimension of the precast pile to be lifted, which is beneficial to improving the universality and safety of the precast pile spreader 100. Of course, a sliding block can be arranged on the hanging beam 1, and a sliding guide rail corresponding to the sliding block is arranged on the adjustable mounting seat 23; the number and the position of the sliding block and the sliding guide rail are not limited, and the sliding block and the sliding guide rail can slide relative to each other as long as the sliding block and the sliding guide rail correspond to each other and can be arranged according to actual requirements in practical application. Wherein, a driving device can be provided for driving the adjustable mounting seat 23 and making the adjustable mounting seat 23 slide on the hanging beam to adjust the distance between the gripper assemblies 21; of course, the distance between the gripper assemblies can also be achieved by manually pushing and pulling the gripper assemblies.

Referring to fig. 2, 4 and 5, in the present embodiment, the gripper assembly 21 has two movable gripper bodies 211 arranged in sequence in the transverse direction, and the gripper driving mechanism 22 can drive at least one movable gripper body 211 to move toward or away from another movable gripper body 211; this enables the clamping and unclamping action of the precast pile 200.

Specifically, the movable clamping body 211 comprises a clamping plate 212, the clamping plate 212 is preferably of a structure which is thin at the bottom and thick at the top, when the precast pile to be lifted by the precast pile lifting appliance 100 is in a stacking state, the structural form of the clamping plate can play a role in guiding when the clamping plate 212 moves down to extend into the gap between the two precast piles 200, and the clamping plate 212 can extend into the gap between the two precast piles 200, so that the lifting efficiency of the precast pile lifting appliance 100 can be improved. A sliding part 2121 capable of sliding along the length direction of the adjustable mounting seat 23 is arranged at the top of the clamping plate 212, preferably, the sliding part 2121 is integrally arranged with the clamping plate 212, and the clamping plate 212 is slidably connected with the adjustable mounting seat 23 through the sliding part 2121; more specifically, the sliding member 2121 has a sliding slot 2122, and the adjustable mount 23 has a sliding rail 232 adapted to the sliding slot 2122 to move on the adjustable mount 23 in cooperation with the sliding member 2121; alternatively, the adjustable mount 23 has a sliding slot, and the sliding element 2121 has a sliding rail adapted to the sliding slot to cooperate with the sliding element 2121 to move on the adjustable mount 23. Wherein, the power that the movable clamping body 211 slides relative to the adjustable mounting seat 23 is provided by the clamping driving mechanism 22, so that the movable clamping body 211 of grabbing of the driving part is close to or away from each other to realize the adjustment of the distance between the movable clamping bodies, and then the different width sizes of the precast pile to be hoisted can be adapted, which is favorable for improving the universality of the precast pile hoisting tool 100.

Referring to fig. 2 and 3, the driving mechanism 22 is mounted on the adjustable mounting base 23, the driving mechanism 22 includes a driving portion 221 and a transmission portion 222, the transmission portion 222 is respectively mounted and fixed with the sliding member 2121 of the movable type gripper body, and the driving portion 221 can drive the sliding member 2121 to move along the adjustable mounting base 23 through the transmission portion 222 to drive the movable type gripper body 211 to move.

Preferably, the gripper assembly 21 includes two movable gripper bodies 211 arranged in sequence, the gripper driving mechanism 22 has a positive screw and a negative screw, the movable gripper bodies 211 are connected to the transmission part 222 through a connecting seat 2221, the transmission part 222 is in transmission connection with the positive screw and the negative screw, the driving part 221 drives the connecting seat 2221 to move through driving the positive screw and the negative screw, and further drives the movable gripper bodies 211 to move closer to or away from each other, in the present technical solution, the transmission part 222 is a ball nut; specifically, referring to fig. 3, the driving portion 221 operates to drive the lead screw to rotate, the rotation of the lead screw is converted into a linear motion of the transmission portion 222 along the lead screw, and the transmission portion 222 drives the slider 2121 connected to the connecting base 2221 to move linearly along the lead screw; the driving portion 221 drives the screw rod to rotate forward or backward, and the driving portion 222 drives the sliding member connected to the connecting seat 2221 to move linearly along the direction a or the direction B, so that the two movable grasping bodies 211 can move closer to or away from each other. Thus, the distance between the two movable gripping bodies 211 can be adjusted by sliding the two movable gripping bodies 211 to adapt to the width of the precast pile 200 to be lifted, which is beneficial to further improving the adaptability of the precast pile lifting appliance. In the embodiment, a specific embodiment is given for illustration, and the invention is not limited to the transmission form of the positive and negative lead screws and the ball nuts, and the movable gripper bodies 211 can not move; in actual use, the setting can be performed as required.

In this embodiment, referring to fig. 2 and 4, the movable grasping and clamping body 211 further includes a hanging rod 213, the hanging rod 213 has a hanging hook 2131, the hanging hook is wedge-shaped, preferably, the width of the hanging rod 213 and the hanging hook 2131 is less than or equal to the thickness of the clamping plate 212, the hanging hook 2131 is installed and fixed at the bottom of the hanging rod 213, any two hanging hooks 2131 are approximately at the same height, preferably, the hanging hook 2131 and the hanging rod 213 are integrally arranged; preferably, the contact surface of the lifting hook 2131 and the precast pile is provided with a non-slip mat. This is beneficial to increase the friction between the precast pile and the lifting hook 2131, thereby being beneficial to preventing the precast pile from slipping off, and further being beneficial to improving the safety of the precast pile lifting appliance 100.

The suspension rods 213 are mounted on both sides of the clamp plate 212 in the longitudinal direction, the clamp plate 212 and the sliding member 2121 are respectively provided with a first through hole and a second through hole through which the suspension rod 213 passes, and the suspension rod 213 can freely rotate in the first through hole and the second through hole.

Specifically, the gripping mechanism 2 further includes a driving mechanism 24, the driving mechanism 24 is in transmission connection with the suspension rod 213 through a connecting arm 241 and is mounted on the slider 2121, and the driving mechanism 24 can drive the connecting arm 241 to deflect to drive the suspension rod 213 to rotate around the central axis of the suspension rod. More specifically, the driving mechanism 24 is a telescopic oil cylinder or an air cylinder, and a telescopic rod of the telescopic oil cylinder or the air cylinder is in transmission connection with the suspension rod 213 through a connecting arm 241; when the telescopic cylinder or the air cylinder drives the telescopic rod to extend or retract, the connecting arm 241 can be driven to act, and the suspension rod 213 is driven to rotate. The drive mechanism 24 can adjust the direction of the hook 2131 depending on whether the precast pile is to be hoisted or loosened 200. Set up like this, lift by crane the precast pile to the assigned position after, only need rotatory jib just can loosen the precast pile, be favorable to improving the efficiency that the precast pile lifted by crane.

It should be noted that: in this embodiment, in order to prevent the influence between the driving mechanisms 24 for driving the suspenders 213 in different movable grasping bodies, each driving mechanism 24 is set to a certain installation angle, so as to be beneficial to preventing the movable grasping bodies from colliding with the driving mechanism 24 when moving, so that the movable grasping bodies are disabled, and to be beneficial to avoiding the driving mechanism 24 from influencing the movement of the movable grasping bodies.

In this embodiment, the precast pile hoist can be favorable to the security and the stability of precast pile hoist process of lifting by crane through setting up two at least grab clamp mechanisms, can provide the support for the precast pile through setting up the lifting hook, further improves the security of hoist and mount. Specifically, when the precast piles are square piles with equal sections, the transverse arrangement distance between the two precast piles is larger than the thickness of the movable grasping and clamping body 211; when the precast pile is a variable cross-section square pile comprising a large cross-section and a small cross-section, the large cross-section sections of two adjacent variable cross-section piles can be mutually closed, and an avoiding space for the movable grasping and clamping body 211 to pass through is formed between the small cross-section sections of the two adjacent variable cross-section piles. Therefore, the driving mechanism is arranged to drive the connecting suspension rod, and when the movable grabbing and clamping body extends into or moves out of the gap between two adjacent precast piles, the suspension rod is driven to rotate around the axis of the suspension rod through the driving mechanism, so that the extension direction of the lifting hook is approximately parallel to the length direction of the precast pile to be lifted, and the movable grabbing and clamping body can extend into or move out of the gap between the precast piles; after the lower extreme of the movable clamp body of grabbing passes the clearance between the precast pile, can make the jib wind jib axial rotation through actuating mechanism's drive for the lifting hook is in same root precast pile bottom, and at the precast pile in-process of lifting by crane like this, the lifting hook can provide certain support for the precast pile, can improve the security that the hoist lifted by crane the process. When the precast pile lifting appliance lifts and lifts the square piles with equal cross sections or square piles with variable cross sections which are independently arranged, the movable grabbing and clamping bodies are respectively positioned at two sides of the precast pile to be lifted, the lifting rod is driven by the driving mechanism to rotate, so that the lifting hook is positioned at the bottom of the precast pile, and the precast pile is supported during lifting; also can set up two movable lifting hooks of grabbing the clamp relatively earlier, hoisting equipment removes the precast pile hoist, with movable grabbing clamp be in respectively waiting to lift by crane the precast pile both sides after, through grabbing the movable grabbing clamp of actuating mechanism drive and removing for the lifting hook is in unified precast pile bottom, lifts by crane the in-process at the precast pile hoist like this, and the lifting hook can provide certain support for the precast pile, can improve the security that the hoist lifted by crane the in-process.

< example two >

In the present embodiment, the same portions as those in the first embodiment are given the same reference numerals, and the same description is omitted.

The main difference between the precast pile spreader of the present embodiment and the first embodiment is the structure of the suspension rod.

Referring to fig. 6, the suspension rod 213 includes a first telescopic rod 2132 and a second telescopic rod 2133, the second telescopic rod 2133 is movably sleeved on the first telescopic rod 2132, the first telescopic rod 2132 can axially move along the second telescopic rod 2133, and a limiting structure for preventing the first telescopic rod 2132 from being separated from the second telescopic rod 2133 is disposed between the first telescopic rod 2132 and the second telescopic rod 2133. In this embodiment, in addition to the beneficial effects of the first embodiment, the following effects are also obtained by this configuration: in the hoisting process, when the clamping plate 212 extends into the gap between the two precast piles, the length of the first telescopic rod 2132 extending out of the second telescopic rod 2133 can be adjusted, so that the suspender 213 extends to the bottom of the precast pile, the length of the clamping plate 212 extending into the gap between the two precast piles is adjusted by the hoisting equipment, and the hoisting process of the lifting appliance is more reliable.

The technical principles of the present invention have been described above with reference to specific embodiments, but it should be noted that the above descriptions are only for explaining the principles of the present invention, and should not be interpreted as specifically limiting the scope of the present invention in any way. Based on the explanation here, those skilled in the art can conceive of other embodiments of the present invention or equivalent alternatives without creative efforts, and will fall into the protection scope of the present invention.

Claims

1. Precast pile hoist, its characterized in that includes: the device comprises a hanging beam controlled by hoisting equipment and at least two gripping and clamping mechanisms distributed on the hanging beam at intervals along the longitudinal direction; the grabbing and clamping mechanism comprises grabbing and clamping components and grabbing and clamping driving mechanisms, the grabbing and clamping components are provided with two movable grabbing and clamping bodies which are arranged in sequence along the transverse direction, and the grabbing and clamping driving mechanisms can drive at least one movable grabbing and clamping body to be close to or far away from the other movable grabbing and clamping body.

2. The precast pile spreader of claim 1, wherein the gripper mechanism further comprises an adjustable mount mounted to the lifting beam and integrating the gripper assembly and the gripper drive mechanism.

3. The precast pile spreader according to claim 2, wherein the movable gripping and clamping body comprises a clamping plate, a sliding member capable of sliding along the adjustable mounting seat is arranged on the top of the clamping plate, and the clamping plate is slidably connected with the adjustable mounting seat through the sliding member.

4. A precast pile spreader according to claim 3, wherein the sliding member has a sliding groove, and the adjustable mounting base has a sliding rail adapted to the sliding groove to cooperate with the sliding member to move on the adjustable mounting base; or the adjustable mounting seat is provided with a sliding groove, and the sliding piece is provided with a sliding rail matched with the sliding groove so as to be matched with the sliding piece to move on the adjustable mounting seat.

5. The precast pile spreader according to claim 3, wherein the gripping and clamping driving mechanism is mounted on the adjustable mounting seat, the gripping and clamping driving mechanism comprises a driving part and a transmission part, the transmission part is fixedly mounted on the sliding part of the movable gripping and clamping body, and the driving part can drive the sliding part to move along the adjustable mounting seat through the transmission part so as to drive the movable gripping and clamping body to move.

6. The precast pile spreader of claim 3, wherein the movable gripping body further comprises a suspension rod, the suspension rod is provided with a lifting hook, the lifting hook is fixedly arranged at the bottom of the suspension rod, and any two lifting hooks are approximately at the same height.

7. The precast pile spreader according to claim 6, wherein the suspension rod is installed at both longitudinal sides of the clamping plate, the clamping plate and the sliding member are respectively provided with a first through hole and a second through hole through which the suspension rod passes, and the suspension rod is freely rotatable in the first through hole and the second through hole.

8. The precast pile spreader of claim 7, wherein the gripping mechanism further comprises a driving mechanism in transmission connection with the boom through a connecting arm, and the driving mechanism is mounted on the sliding member, and the driving mechanism can drive the connecting arm to deflect to drive the boom to rotate around the central axis of the boom.

9. The precast pile spreader according to claim 8, wherein the driving mechanism is a telescopic cylinder or air cylinder, and a telescopic rod of the telescopic cylinder or air cylinder is in transmission connection with the boom through a connecting arm.

10. The precast pile lifting appliance according to claim 6, wherein the suspension rod comprises a first telescopic rod and a second telescopic rod, the second telescopic rod is movably sleeved on the first telescopic rod, the first telescopic rod can axially move along the second telescopic rod, and a limiting structure for preventing the first telescopic rod from being separated from the second telescopic rod is arranged between the first telescopic rod and the second telescopic rod.

11. A precast pile spreader according to claim 6, wherein the lifting hook is provided integrally with the boom.

12. The precast pile spreader according to claim 6, wherein the contact surface of the lifting hook and the precast pile is provided with a non-slip mat.

13. A precast pile spreader according to claim 6, wherein the lifting hook is wedge-shaped.