CN113135488B

CN113135488B - Precast pile hoist

Info

Publication number: CN113135488B
Application number: CN202110449166.1A
Authority: CN
Inventors: 李明胜; 陈喜栓; 高伟; 蒋慧超; 陈军; 袁敏磊; 蒋昆志
Original assignee: China Coal Yangtze River Infrastructure Co ltd
Current assignee: China Coal Yangtze River Infrastructure Co ltd
Priority date: 2021-04-25
Filing date: 2021-04-25
Publication date: 2022-06-10
Anticipated expiration: 2041-04-25
Also published as: CN113135488A

Abstract

The application relates to a precast pile lifting appliance, which belongs to the technical field of mechanical lifting equipment, and comprises a fixing sleeve and a lifting appliance body connected with the fixing sleeve, wherein a plurality of hooks are arranged on the fixing sleeve, the lifting appliance body is connected with the hooks, an automatic unhooking device is arranged on the lifting appliance body, and the automatic unhooking device comprises an unhooking mechanism and a locking mechanism which are connected with each other. When lifting the precast pile, at first, locate fixed cover on the precast pile to fix between fixed cover and the precast pile, then be connected between hoist and the couple through locking mechanism, can lift by crane the precast pile through the hoist. After the precast pile is pre-buried inside the foundation ditch, can break away from the connection between couple and the hoist through unhooking mechanism, need not artifical high altitude construction and dismantle the hoist from the couple, reduce the potential safety hazard that high altitude construction caused.

Description

Precast pile hoist

Technical Field

The application relates to the technical field of mechanical hoisting equipment, in particular to a precast pile lifting appliance.

Background

The precast pile is suitable for treating foundation such as silt, mucky soil, cohesive soil, silt, sandy soil, artificial filling soil and the like, and the main construction method is to bury the precast pile after drilling by using special equipment.

In the construction process of the precast pile by adopting an embedding method, the precast pile needs to be hoisted. In the correlation technique, in the process of hoisting and conveying the precast pile, firstly, a fixed sleeve is sleeved at one end of the precast pile, the fixed sleeve is fixed on the precast pile, then, a lifting hook on the fixed sleeve is hoisted through a lifting appliance, the precast pile can be hoisted, the prefabricated pile is inserted into a drilled hole of a foundation to be embedded, and then, the lifting appliance is separated from the lifting hook on the fixed sleeve through manual high-altitude operation.

Aiming at the related technologies, the inventor thinks that the potential safety hazard exists when an operator works aloft to separate the lifting appliance from the lifting hook on the fixed sleeve.

Disclosure of Invention

In order to improve the problem that there is the potential safety hazard in operator's high altitude construction, this application provides a precast pile hoist.

The application provides a precast pile hoist adopts following technical scheme:

the utility model provides a precast pile hoist, includes fixed cover and the hoist body of being connected with fixed cover, fixed sheathe in is provided with a plurality of couples, the hoist body is connected with the couple, be provided with automatic unhook device on the hoist body, automatic unhook device includes interconnect's unhook mechanism and locking mechanism.

Through adopting above-mentioned technical scheme, when lifting by crane the precast pile, at first, locate the precast pile with fixed cover to fixing between fixed cover and the precast pile, then being connected between hoist and the couple through locking mechanism, can lifting by crane the precast pile through the hoist. After the precast pile is pre-buried inside the foundation ditch, can break away from the connection between couple and the hoist through unhooking mechanism, need not artifical high altitude construction and dismantle the hoist from the couple, reduce the potential safety hazard that high altitude construction caused.

Optionally, the hanger body comprises a lifting box and a lifting hook, and the automatic unhooking device is installed in the lifting box;

the unhooking mechanism comprises a control plate and a rotating assembly, one end of the control plate is rotatably arranged in the hoisting box, and the rotating assembly is arranged in the hoisting box and used for driving the control plate to rotate;

the control panel has seted up the arc hole along its length direction, the lifting hook includes fixed connection's dead lever and fixed hook, the gag lever post is worn to be equipped with by the dead lever one end of keeping away from the fixed hook, the gag lever post slides and wears to locate in the arc hole, detain mutually between fixed hook and the couple.

Through adopting above-mentioned technical scheme, after the precast pile is pre-buried inside the foundation ditch, through the runner assembly rotation control panel, because the position between fixed hook and the couple remains unchanged, when consequently the control panel rotates, the gag lever post can slide along the lateral wall in arc hole, when the tip lateral wall contact in gag lever post and arc hole, and when runner assembly continued to drive the control panel pivoted, the dead lever will tend to the slope gradually, misplace gradually between fixed hook and the couple, can be with the separation and connection between fixed hook and the couple.

Optionally, the locking mechanism includes a locking sheet, the rotation center of the one end control panel of locking sheet length direction rotates to be connected, the length direction of locking sheet is provided with one end open-ended guide way, the guide way runs through the thickness direction of locking sheet, the gag lever post is inserted and is located the guide way, the gag lever post is followed the length direction of guide way slides.

Through adopting above-mentioned technical scheme, when the control panel rotated, when the gag lever post removed along the length direction in arc hole, can slide along the length direction of guide way, when the gag lever post moved towards rotating assembly's direction along the length direction of guide way, the stay was close to each other with the fixed hook gradually, and final fixed hook offsets with the stay, can be with the couple spacing in the fixed hook.

Optionally, the control panel with the stay all sets up to two, two the control panel, and two the stay all sets up along the central plane symmetry of dead lever width direction.

Through adopting above-mentioned technical scheme, two control panels and two stay can support the both ends of gag lever post, can drive two control panels simultaneously through rotating assembly and rotate to drive the fixed hook motion that can be more, realize the locking between fixed hook and the couple and break away from.

Optionally, the rotating assembly comprises a worm wheel, a worm and a motor, the worm wheel is fixedly connected with the control panel, the worm and the worm are meshed with each other, and an output shaft of the motor is connected with the worm;

and an emergency stop switch is arranged on the side wall of the fixed hook and is electrically connected with the motor.

Through adopting above-mentioned technical scheme, the starter motor, the output shaft of motor rotates and drives the worm and rotate, drives the worm wheel through the worm and rotates to can drive the control panel and rotate, the control panel rotates and makes the stay towards the direction motion of fixed hook, after the stay touches towards the one end of fixed hook and the scram switch on the fixed hook, scram switch control motor stall motion, the control panel will stall to reduce the waste of resource and the damage of reduction equipment. The position of the hook is limited through the locking sheet, so that the hook and the fixed hook are not easy to unhook.

Optionally, a clamping mechanism for locking the precast pile is arranged in the fixed sleeve, the clamping mechanism comprises a plurality of arc-shaped clamping pieces, a screw is fixed on one surface of each arc-shaped clamping piece facing the inner wall of the fixed sleeve, each screw is slidably arranged on the side wall of the fixed sleeve in a penetrating manner, each screw is sleeved with a driving sleeve in a threaded manner, and the end part of the driving sleeve is rotatably connected with the inner wall of the fixed sleeve;

the hooks are positioned at two ends of the diameter of the fixed sleeve, two arc-shaped clamping pieces which are arranged close to the two hooks are first clamping pieces, the rest arc-shaped clamping pieces are second clamping pieces, and first pull ropes are fixed at two ends of the two first clamping pieces;

the two first pull ropes positioned on the same first clamping piece penetrate through the second clamping piece in a sliding mode along the circumferential direction of the precast pile, penetrate out of the screw rod on the other first clamping piece and are fixed with the end portion of the hook.

Through adopting above-mentioned technical scheme, when lifting by crane the couple through the hoist body, the hoist body exerts the force to the couple, and the couple exerts force to first stay cord, can exert the opposite direction in the both ends of first card to inside the second card is worn to locate by first stay cord, can hold the precast pile tightly through a plurality of first cards of two first stay cord drives and second card, make the precast pile be difficult to be in the disconnection with fixed cover at the in-process that lifts by crane.

Optionally, every the both ends of second card length direction all articulate there is the bracing piece, a plurality of spouts have been seted up on the inner wall of fixed cover, every the bracing piece is inserted towards the one end slope of fixed cover and is located the spout, every the direction slope that two bracing pieces on the second card carried on the back mutually, every the one end that the bracing piece stretched into the spout all is connected with the second stay cord, every the second stay cord on two bracing pieces on the second card extends towards relative direction and with the end fixing of couple.

Through adopting above-mentioned technical scheme, when lifting by crane the couple through the hoist body, the hoist body exerts the force to the couple, and the couple exerts the force to the second stay cord, can exert force towards relative direction with two bracing pieces of same group through the second stay cord, makes the bracing piece can towards relative slip, and the tip of bracing piece will exert thrust to the second card, makes to support tightly between second card and the precast pile, makes the precast pile further be difficult to be in the disconnection with fixed cover at the in-process that lifts by crane.

Optionally, the length of the supporting rod is 1.1 times to 1.2 times of the distance between the outer wall of the second clamping piece and the inner wall of the fixing sleeve.

Through adopting above-mentioned technical scheme, can exert force to the second card, make and can support tightly between second card and the precast pile.

Optionally, each arc card is provided with the skid resistant course in the one side of keeping away from fixed cover.

Through adopting above-mentioned technical scheme, can increase the frictional force between arc card and the precast pile, further make difficult to break away from between precast pile and the fixed cover and be connected.

In summary, the present application includes at least one of the following beneficial technical effects:

1. through the arrangement of the unhooking mechanism and the locking mechanism, the lifting appliance is not required to be disassembled from the hook in the manual high-altitude operation, and the effect of reducing potential safety hazards caused by the high-altitude operation is achieved;

2. through the arrangement of the first pull rope and the second pull rope, the effect that the precast pile is not easily disconnected from the fixed sleeve in the hoisting process can be achieved;

3. through the setting of scram switch, after locking between stay and the couple, can control the motor stall, play the effect that reduces the waste of resource and reduce the damage of equipment.

Drawings

Fig. 1 is a schematic view of the overall construction of a precast pile spreader in an embodiment of the present application;

fig. 2 is a schematic view of the internal structure of a spreader body in an embodiment of the present application;

fig. 3 is a schematic view of the internal structure of the pouch;

FIG. 4 is an enlarged schematic view of portion A of FIG. 3;

FIG. 5 is a schematic diagram of the connection relationship between the arc-shaped cards;

FIG. 6 is a schematic view of the initial position of the hook and retainer hook;

FIG. 7 is a schematic view showing the engagement position of the hook and the fixing hook;

fig. 8 is a schematic position diagram of the mutual limiting and locking between the hook and the fixing hook.

Description of reference numerals: 1. fixing a sleeve; 11. hooking; 12. a chucking mechanism; 121. a first card; 1211. a first pull cord; 1212. an anti-slip layer; 122. a second card; 1221. a support bar; 1222. a chute; 1223. a second pull cord; 123. a screw; 124. a drive sleeve; 13. mounting blocks; 131. mounting holes; 2. a hanger body; 21. lifting the box; 211. a control lever; 22. lifting a lifting hook; 221. fixing the rod; 222. a fixed hook; 2221. a scram switch; 223. a limiting rod; 3. an automatic unhooking device; 31. a unhooking mechanism; 311. a control panel; 3111. an arc-shaped hole; 312. a rotating assembly; 3121. a worm gear; 3122. mounting grooves; 3123. a worm; 3124. a motor; 32. a locking mechanism; 321. a locking piece; 3211. a locking lever; 322. a guide groove; 33. a first gear; 34. a second gear; 4. and (6) prefabricating the pile.

Detailed Description

The present application is described in further detail below with reference to figures 1-8.

The embodiment of the application discloses precast pile hoist. Referring to fig. 1 and 2, a precast pile lifting appliance includes a fixing sleeve 1 sleeved on a precast pile 4, and a lifting appliance body 2 connected with the fixing sleeve 1, wherein the lifting appliance body 2 is used for lifting the precast pile 4. The circumference of fixed cover 1 evenly is provided with a plurality of couples 11, and in this embodiment, the quantity of couple 11 sets up to two, and the quantity of couple 11 also can be three or four, a plurality of couples 11 along the circumference align to grid of fixed cover 1 can. The inside of fixed cover 1 is provided with the chucking mechanism 12 that locks precast pile 4, makes the difficult phenomenon that takes off of production between fixed cover 1 and the precast pile 4. The hoist body 2 includes a hoisting box 21 and a hoisting hook 22, and the hoisting hook 22 is provided as a plurality of, and the number of the hoisting hook 22 is the same as that of the hooks 11, that is, two hoisting hooks 22 are connected with two hooks 11 in a mutually buckled manner. Be provided with automatic unhooking device 3 in lifting by crane case 21, automatic unhooking device 3 includes interconnect's unhooking mechanism 31 and locking mechanism 32, locks between lifting hook 22 and couple 11 through locking mechanism 32, lifts by crane when precast pile 4 and accomplishes the back, carries out the unhooking between lifting hook 22 and the couple 11 through unhooking mechanism 31, can break away from the connection between the fixed cover 1 of hoist body 2 and precast pile 4. In this embodiment, two automatic unhooking devices 3 are provided, and the two automatic unhooking devices 3 are respectively matched with the two hooks 11.

Referring to fig. 3, the chucking mechanism 12 includes a plurality of arc-shaped clamping pieces, the arc-shaped clamping pieces are divided into two groups, two arc-shaped clamping pieces adjacent to the hook 11 are first clamping pieces 121, and the other arc-shaped clamping pieces are second clamping pieces 122. One side that fixed cover 1 was kept away from to every first card 121 and every second card 122 all is provided with skid resistant course 1212, and skid resistant course 1212 is the rubber material to increase the frictional force between arc card and the precast pile 4. The first card 121 and the second card 122 are connected with the fixing sleeve 1 through a screw 123. One end of the screw rod 123 is fixed with the arc-shaped clamping piece, and the other end of the screw rod 123 is slidably arranged on the side wall of the fixed sleeve 1 in a penetrating manner. The screw rod 123 is sleeved with the driving sleeve 124 in a threaded manner, the end of the driving sleeve 124 is rotatably connected with the inner wall of the fixed sleeve 1, and the driving sleeve 124 is rotated, so that the arc-shaped clamping piece can move along the axis direction of the screw rod 123, and the fixed sleeve 1 and the precast pile 4 can be fixed and loosened.

Referring to fig. 3 and 4, a first pulling rope 1211 is fixed at each end of each first clamping piece 121, and the two first pulling ropes 1211 located on the same first clamping piece 121 sequentially penetrate through the second clamping piece 122, the other first clamping piece 121 and the screw 123 on the first clamping piece 121 along the circumferential direction of the precast pile 4. The fixing sleeve 1 is fixed with mounting blocks 13 at positions close to the hooks 11, mounting holes 131 are formed in the mounting blocks 13, the end portions of the hooks 11 are slidably inserted into the mounting holes 131, and one ends of the two first stay ropes 1211 extending out of the screw 123 are fixed with the end portions of the hooks 11 located on the mounting blocks 13.

Referring to fig. 3, two ends of each second card 122 in the length direction are hinged to a support rod 1221, the inner wall of the fixing sleeve 1 is provided with a plurality of sliding grooves 1222, and the number of the sliding grooves 1222 is the same as that of the support rods 1221. Each support bar 1221 is obliquely inserted into the sliding slot 1222 toward one end of the fixing sleeve 1, and the two support bars 1221 on each second card 122 are obliquely inclined in opposite directions. In order to apply a pushing force to the arc-shaped card through the supporting rods 1221, the length of the supporting rods 1221 is 1.1 times to 1.2 times of the distance between the outer wall of the second card 122 and the inner wall of the fixing sleeve 1, and in this embodiment, the length of the supporting rods 1221 is 1.2 times of the distance between the outer wall of the second card 122 and the inner wall of the fixing sleeve 1.

Referring to fig. 4 and 5, a second pulling rope 1223 is connected to one end of each supporting rod 1221 extending into the sliding groove 1222, and two second pulling ropes 1223 of the same second clamping piece 122 are crossed and relatively pulled. In the initial state, the two support rods 1221 on the same second card 122 are located at the ends of the two sliding slots 1222 facing away from each other, and when a pulling force is applied to the second pulling rope 1223, the two support rods 1221 on the same second card 122 will move along the two sliding slots 1222 in opposite directions. The second pulling ropes 1223 of the two supporting rods 1221 of each second locking piece 122 extend in opposite directions from the inside of the mounting block 13 of the fixing cover 1 and are fixed to the ends of the hooks 11. The supporting rods 1221 may be disposed at both ends of the first card 121, and the second pulling rope 1223 is disposed at an end of the supporting rod 1221, and the mounting structure and the using method are the same as those of the supporting rod 1221 and the second pulling rope 1223 on the second card 122, and are not described herein again.

Referring to fig. 6, the unhooking mechanism 31 includes a control plate 311 and a rotating assembly 312 for driving the control plate 311 to rotate, a control rod 211 is fixedly disposed in the hoisting box 21, and a rotation center of the control plate 311 is fixedly rotatably sleeved on the control rod 211. The rotating assembly 312 comprises a worm wheel 3121, a worm 3123 and a motor 3124, a mounting groove 3122 is opened on the worm wheel 3121, a side wall of the control plate 311 is fixedly connected with a side wall of the mounting groove 3122, and a rotation center of the worm wheel 3121 is a rotation center of the control plate 311. The worm 3123 and the worm 3123 are engaged with each other, both ends of the worm 3123 are rotatably arranged on the side wall of the lifting box 21, and the motor 3124 is fixed on the side wall of the lifting box 21. Since the gear teeth on the circumference of the worm wheel 3121 are an incomplete circle, in order to facilitate the operation of the motor 3124, the fixing sleeve 1 is provided with a first gear 33 on the output shaft of the motor 3124, a second gear 34 is fixed on the end of the worm 3123, and the first gear 33 and the second gear 34 are driven by a belt. The first gear 33 has a pitch circle diameter 0.4 to 0.5 times the pitch circle diameter of the second gear 34, thereby providing a deceleration effect on the rotation of the worm 3123. In this embodiment, the motor 3124 is a stepping motor.

Referring to fig. 7, the control boards 311 are provided in two, and the two control boards 311 are arranged in parallel with each other. The lateral wall of the one end of worm wheel 3121 is kept away from to every control panel 311 sets up to the arc, has seted up arc hole 3111, the arc hole 3111 parallel arrangement of two control panels 311 on control panel 311 and along the length direction of keeping away from the arc side of worm wheel 3121. The distance between the side wall of the arc-shaped hole 3111 and the control lever 211 is gradually increased, and one end of the lifting hook 22 away from the hook 11 is inserted into the arc-shaped hole 3111. The lifting hook 22 comprises a fixed rod 221 and a fixed hook 222 which are fixedly connected, a limiting rod 223 is fixedly arranged at one end of the fixed rod 221, which is far away from the fixed hook 222, in a penetrating manner, and the limiting rod 223 is arranged in the arc-shaped hole 3111 in a sliding manner. A scram switch 2221 is arranged on the side wall of the fixed hook 222, and the scram switch 2221 is electrically connected with the motor 3124.

Referring to fig. 8, the locking mechanism 32 includes two locking plates 321, in this embodiment, each locking mechanism 32 is provided with two locking plates 321, the two locking plates 321 are arranged in parallel, the two locking plates 321 are located between the two control plates 311, and one end of each locking plate 321 in the length direction is rotatably sleeved on the control rod 211. The locking sheet 321 is provided with a guide groove 322 with an opening at one end along the length direction of the locking sheet 321, the guide groove 322 penetrates through the thickness direction of the locking sheet 321, the locking sheet 321 is arranged in a U shape, the limiting rod 223 is inserted into the guide groove 322, the fixing rod 221 is located between the two locking sheets 321, and the limiting rod 223 slides along the length direction of the guide groove 322. Two control panels 311 and two locking strips 321 in two sets are arranged symmetrically along the central plane of the width direction of the fixing rod 221, and when the control panels 311 rotate, the lifting hook 22 can be driven simultaneously, so that the movement accuracy of the lifting hook 22 is improved.

Referring to fig. 8, the locking plate 321 is formed with two locking levers 3211 at both sides of the guide groove 322, and the locking lever 3211 bent toward the fixed hook 222 at an inner arc is longer than the locking lever 3211 toward an outer wall of the fixed hook 222. When the control panel 311 rotates, the limiting rod 223 moves along the length direction of the arc-shaped hole 3111, the limiting rod 223 moves along the length direction of the guide groove 322 towards the direction of the rotating assembly 312, the long locking rod 3211 gradually approaches the fixed hook 222, and finally abuts against the fixed hook 222, and the emergency stop switch 2221 is touched, the motor 3124 stops running, that is, the hook 11 can be reliably limited in the fixed hook 222 through the locking rod 3211.

The implementation principle of 4 hoists of precast pile of this application embodiment is: when lifting the precast pile 4, firstly, the fixing sleeve 1 is sleeved on the precast pile 4, the driving sleeve 124 is sequentially rotated, and the arc-shaped clamping pieces are sequentially abutted against the side wall of the precast pile 4. Then the fixed hook 222 and the hook 11 are mutually buckled and connected, the motor 3124 is started, the control panel 311 is driven to rotate, so that the locking rod 3211 of the locking sheet 321 can move towards the direction of the fixed hook 222, after the locking rod 3211 touches the emergency stop switch 2221, the motor 3124 stops running, the fixed hook 222 and the hook 11 are reliably connected, and the connection between the fixed hook 222 and the hook 11 is reliably limited through the locking rod 3211. And finally, hoisting the precast pile 4 by a crane. After the precast pile 4 is pre-buried inside the foundation pit, the motor 3124 is started, the motor 3124 rotates reversely, the locking rod 3211 on the locking sheet 321 moves towards the direction far away from the hook 11, and the locking sheet 321 cancels the limit of the hook 11. Meanwhile, the limiting rod 223 slides along the side wall of the arc-shaped hole 3111, when the limiting rod 223 contacts with the side wall of the end of the arc-shaped hole 3111, and the control plate 311 continues to rotate, the fixing rod 221 gradually tends to incline, the fixing hook 222 and the hook 11 are gradually dislocated, and the fixing hook 222 and the hook 11 can be disconnected.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a precast pile hoist, includes fixed cover (1) and hoist body (2) be connected with fixed cover (1), its characterized in that: the lifting appliance is characterized in that the fixing sleeve (1) is provided with a plurality of hooks (11), the lifting appliance body (2) is connected with the hooks (11), the lifting appliance body (2) is provided with an automatic unhooking device (3), and the automatic unhooking device (3) comprises an unhooking mechanism (31) and a locking mechanism (32) which are connected with each other;

the lifting appliance body (2) comprises a lifting box (21) and a lifting hook (22), and the automatic unhooking device (3) is arranged in the lifting box (21);

the unhooking mechanism (31) comprises a control plate (311) and a rotating assembly (312), one end of the control plate (311) is rotatably arranged in the hoisting box (21), and the rotating assembly (312) is arranged in the hoisting box (21) and used for driving the control plate (311) to rotate;

the control panel (311) is provided with an arc-shaped hole (3111) along the length direction, the lifting hook (22) comprises a fixed rod (221) and a fixed hook (222) which are fixedly connected, a limiting rod (223) penetrates through one end, far away from the fixed hook (222), of the fixed rod (221), the limiting rod (223) penetrates through the arc-shaped hole (3111) in a sliding mode, and the fixed hook (222) is buckled with the hook (11);

the locking mechanism (32) comprises a locking sheet (321), one end of the locking sheet (321) in the length direction is rotatably connected with the rotation center of the control plate (311), a guide groove (322) with one open end is formed in the locking sheet (321) in the length direction, the guide groove (322) penetrates through the locking sheet (321) in the thickness direction, the limiting rod (223) is inserted into the guide groove (322), and the limiting rod (223) slides along the length direction of the guide groove (322);

the rotating assembly (312) comprises a worm wheel (3121), a worm (3123) and a motor (3124), the worm wheel (3121) is fixedly connected with the control plate (311), the worm (3123) is meshed with the worm (3123), and an output shaft of the motor (3124) is connected with the worm (3123);

the side wall of the fixed hook (222) is provided with a scram switch (2221), and the scram switch (2221) is electrically connected with the motor (3124).

2. A precast pile spreader according to claim 1, wherein: the control panel (311) with locking sheet (321) all sets up to two, two control panel (311), and two locking sheet (321) all sets up along dead lever (221) width direction's central plane symmetry.

3. A precast pile spreader according to claim 1, wherein: a clamping mechanism (12) for locking the precast pile (4) is arranged in the fixed sleeve (1), the clamping mechanism (12) comprises a plurality of arc-shaped clamping pieces, a screw rod (123) is fixed on one surface, facing the inner wall of the fixed sleeve (1), of each arc-shaped clamping piece, each screw rod (123) penetrates through the side wall of the fixed sleeve (1) in a sliding mode, a driving sleeve (124) is sleeved on each screw rod (123) in a threaded mode, and the end portion of each driving sleeve (124) is rotatably connected with the inner wall of the fixed sleeve (1);

the hooks (11) are positioned at two ends of the diameter of the fixed sleeve (1), two arc-shaped clamping pieces which are close to the two hooks (11) are first clamping pieces (121), the rest arc-shaped clamping pieces are second clamping pieces (122), and two ends of each first clamping piece (121) are respectively fixed with a first pull rope (1211);

two first pull ropes (1211) positioned on the same first clamping piece (121) are slidably arranged on the second clamping piece (122) along the circumferential direction of the precast pile (4), penetrate out of a screw rod (123) on the other first clamping piece (121), and are fixed with the end part of the hook (11).

4. A precast pile spreader according to claim 3, wherein: every second card (122) length direction's both ends all articulate there is bracing piece (1221), seted up a plurality of spout (1222) on the inner wall of fixed cover (1), every bracing piece (1221) is inserted towards the one end slope of fixed cover (1) and is located in spout (1222), every two bracing pieces (1221) on second card (122) incline to the direction that backs on the back mutually, every the one end that bracing piece (1221) stretched into spout (1222) all is connected with second stay cord (1223), every second stay cord (1223) on two bracing pieces (1221) on second card (122) extend towards relative direction and with the end fixing of couple (11).

5. A precast pile spreader according to claim 4, wherein: the length of the support rod (1221) is 1.1 to 1.2 times of the distance between the outer wall of the second clamping piece (122) and the inner wall of the fixing sleeve (1).

6. A precast pile spreader according to claim 3, wherein: every one side that fixed cover (1) was kept away from to the arc card all is provided with skid resistant course (1212).