CN116425072B - Gapless continuous jacking method - Google Patents
Gapless continuous jacking method Download PDFInfo
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- CN116425072B CN116425072B CN202310707455.6A CN202310707455A CN116425072B CN 116425072 B CN116425072 B CN 116425072B CN 202310707455 A CN202310707455 A CN 202310707455A CN 116425072 B CN116425072 B CN 116425072B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000006073 displacement reaction Methods 0.000 claims abstract description 17
- 230000008569 process Effects 0.000 claims abstract description 10
- 230000007246 mechanism Effects 0.000 claims description 13
- 125000006850 spacer group Chemical group 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 15
- 230000005540 biological transmission Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 3
- 239000010720 hydraulic oil Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/46—Combinations of several jacks with means for interrelating lifting or lowering movements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
- B66F3/25—Constructional features
- B66F3/30—Constructional features with positive brakes or locks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F2700/00—Lifting apparatus
- B66F2700/05—Hydraulic jacks
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention relates to a gapless continuous jacking method. The invention comprises that at least one group of first hydraulic jacks and one group of second hydraulic jacks are arranged at the lower end of a structure to be lifted, and the hydraulic jacks are provided with automatic self-locking nuts, so that absolute safety of lifting with load can be ensured; each group of first hydraulic jacks and each group of second hydraulic jacks can synchronously stretch and retract through corresponding hydraulic control systems and jack up a structure to be jacked, and supporting devices for enabling the first hydraulic jacks and the second hydraulic jacks to generate vertical displacement are arranged below the first hydraulic jacks and the second hydraulic jacks respectively; one of the first hydraulic jack and the second hydraulic jack is extended to lift the structure to be lifted to a preset height, and the other one is moved upwards to a preset position and extended to be retracted after being connected with the structure to be lifted, and the above processes are alternately repeated. The invention can realize the gapless continuous lifting of the large-sized structure, and improves the working efficiency while safely lifting.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a gapless continuous jacking method.
Background
The hydraulic cylinder (i.e. hydraulic jack) lifting heavy load is a common construction method in engineering, especially when a heavy load workpiece with a weight of more than hundreds of tons is lifted or horizontally installed, the hydraulic lifting is almost the only viable option, and because the hydraulic jack has unsafe accident potential such as oil leakage, pipe explosion and the like due to the sealing of an internal piston. In order to solve the potential safety hazard that the hydraulic oil pipe is damaged or the oil cylinder is damaged in a sealing way, the hydraulic jack with a mechanical lock nut is arranged in the conventional hydraulic jack specification, and the mechanical lock nut on the hydraulic jack is manually rotated and screwed after the hydraulic jack lifts the structure in place, so that the lifted structure bears force through the mechanical lock nut and the outer cylinder wall of the hydraulic jack, and the damage of the hydraulic oil pipe or the damage of the oil cylinder seal can not cause the potential safety hazard to the structure. However, the method of manually tightening the locking nut cannot realize real-time protection of the hydraulic jack on the structural object in the jacking process, and particularly, when a larger structural object is jacked, a plurality of hydraulic jacks are needed for jacking at the same time, and at the moment, due to the limitation of environmental conditions, a plurality of manual jacking processes cannot be arranged for synchronously tightening the locking nut in real time, and the potential safety hazard of jacking cannot be eliminated.
The protection device for the mechanical screw rod automatic following supporting mechanism is characterized in that a group of follow-up supporting mechanisms are added while a hydraulic oil cylinder synchronously lifts a heavy object, so that safety during heavy load lifting can be ensured, but the protection device has the defects that after lifting in place, gaps between cushion blocks cannot be eliminated, uneven stress of the screw rod follow-up supporting mechanisms can be caused when a plurality of screw rod follow-up supporting mechanisms are simultaneously and intensively supported, damage to the screw rod follow-up supporting mechanisms and overlarge local stress to a heavy load structural member are caused, structural damage is caused, and stress and transverse deflection to a bridge beam body are easily generated.
Disclosure of Invention
In order to solve the technical problems, the invention provides the gapless continuous jacking method, which can realize the gapless continuous jacking of a large-sized structure, and greatly improve the working efficiency of jacking construction while realizing safe jacking.
In order to solve the technical problems, the invention provides a gapless continuous jacking method, which comprises the following steps:
at least one group of first hydraulic jacks and one group of second hydraulic jacks are arranged at the lower end of the structure to be lifted; each group of first hydraulic jacks and each group of second hydraulic jacks are connected to a hydraulic control system, each group of first hydraulic jacks and each group of second hydraulic jacks can synchronously stretch and retract independently through the corresponding hydraulic control system and lift the structure to be lifted, and a supporting device for enabling the first hydraulic jacks and the second hydraulic jacks to vertically displace is arranged below each first hydraulic jack and each second hydraulic jack;
one of the first hydraulic jacks and the second hydraulic jacks extends out, the structure to be lifted is lifted to a preset height, the other group is moved upwards to a preset position through a supporting device and extends out to be retracted after being connected with the structure to be lifted, and the above processes are alternately repeated.
In one embodiment of the present invention, further comprising:
each group of the second hydraulic jacks upwards move through a respective supporting device while each group of the first hydraulic jacks extends out;
when each group of the first hydraulic jacks extend to a first preset stroke, each group of the second hydraulic jacks upwards generate a first preset displacement through the corresponding supporting device;
each group of the second hydraulic jacks start to extend, and each group of the first hydraulic jacks are in an extending state continuously until each group of the first hydraulic jacks start to retract after being connected to the structure to be lifted;
when each group of the first hydraulic jacks retract to an initial state, each group of the first hydraulic jacks upwards generate second preset displacement through the corresponding supporting device;
when each group of second hydraulic jacks extend to a second preset stroke, each group of first hydraulic jacks start extending, and each group of second hydraulic jacks are in an extending state continuously until each group of first hydraulic jacks are connected to the structure to be lifted, and each group of second hydraulic jacks start retracting.
In one embodiment of the present invention, the first preset stroke and the second preset stroke are equal.
In one embodiment of the present invention, the first preset stroke is 2/3 of the total stroke of the first hydraulic jack, and the second preset stroke is 2/3 of the total stroke of the second hydraulic jack.
In one embodiment of the present invention, the first preset displacement is equal to the first preset stroke, and the second preset displacement is twice as large as the first preset stroke or the second preset stroke.
In one embodiment of the present invention, the first hydraulic jack and the second hydraulic jack include:
the upper end of the oil cylinder is provided with a supporting part;
the lower end of the piston rod is provided with a supporting base;
the lock nut is connected with the piston rod through threads and is provided with external teeth in the circumferential direction;
the limiting cover is connected to the lower end of the oil cylinder and covers the locking nut;
the driving mechanism comprises a driving gear which extends into the limiting cover and is meshed with the external teeth of the lock nut, and is used for driving the lock nut to move along the piston rod;
the limiting ring is connected with the piston rod and positioned at the lower side of the locking nut;
when the piston rod is retracted, the lock nut moves to a position in contact with the limiting ring; when the piston rod is lifted, the lock nut moves to a position contacting the limiting cover.
In one embodiment of the present invention, the structure to be lifted includes a bridge beam body, the bridge beam body includes at least two lifting surfaces arranged in parallel, and the first hydraulic jack and the second hydraulic jack are linearly distributed along the parallel surfaces and are arranged at intervals.
In one embodiment of the invention, the support device comprises a spacer block stacked below the first hydraulic jack and the second hydraulic jack, the height of the spacer block being equal to the first preset stroke and/or the second preset stroke;
and/or, the support device comprises:
the outer cylinder is arranged on the foundation, and a plurality of groups of locking inclined planes are circumferentially distributed on the side wall of the outer cylinder along the axial direction;
the inner cylinder coaxially moves in the outer cylinder, the upper end of the inner cylinder is used for being connected with the first hydraulic jack or the second hydraulic jack, a plurality of groups of notches corresponding to a plurality of groups of locking inclined planes are circumferentially distributed on the side wall of the inner cylinder along the axial direction, and the distance between two groups of axially adjacent notches is equal to the first preset stroke and/or the second preset stroke;
the annular bracket is connected in the inner cylinder and is arranged corresponding to each group of notch;
the limiting mechanism comprises limiting blocks which are elastically connected to the annular support and correspond to the notches, a telescopic rotating shaft coaxially arranged in the inner cylinder, a driving assembly for driving the telescopic rotating shaft to rotate around the axis of the driving assembly, and pull ropes which are axially distributed on the telescopic rotating shaft and are elastically connected with the limiting blocks;
the pull rope can be pulled or loosened through the rotation of the telescopic rotating shaft, so that the limiting block stretches radially along the notch, when the pull rope is loosened, the limiting block can extend along the notch and radially slide to a locking inclined plane position along the outer cylinder, and the inner wall of the inner cylinder is locked and matched with the outer cylinder through the inclined plane so as to limit the axial movement of the inner cylinder.
In one embodiment of the invention, the driving assembly comprises a rocker arm, the rocker arm is connected with a transmission shaft, the telescopic rotating shaft is provided with a first bevel gear, and the transmission shaft is provided with a second bevel gear matched with the bevel gear.
In one embodiment of the invention, when the required jacking height of the structure to be jacked is larger than the maximum height of the inner cylinder extending out of the outer cylinder, a cushion block is stacked at the lower end of the outer cylinder.
Compared with the prior art, the technical scheme of the invention has the following advantages:
according to the gapless continuous jacking method, two groups of hydraulic jacks with automatic self-locking nuts and the supporting device are arranged, one group extends to jack the structure to be jacked to the preset height, the other group moves upwards to the preset position through the supporting device and extends to be connected with the structure to be jacked and then retracts, the above processes are alternately repeated, gapless continuous jacking of a large-sized structure can be achieved, safe jacking is achieved, and meanwhile the working efficiency of jacking construction is greatly improved.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings.
Fig. 1 is a schematic view of the first hydraulic jack and the second hydraulic jack arrangement of the present invention.
Fig. 2 is a schematic front view of the first hydraulic jack and the second hydraulic jack arrangement of the present invention.
Fig. 3 is a schematic view of the structure of the hydraulic jack of the present invention.
Fig. 4 is a schematic view of the hydraulic jack of the present invention in an extended state.
Fig. 5 is a schematic view of the retracted state of the hydraulic jack of the present invention.
Fig. 6 is a schematic view of the structure of the supporting device of the present invention.
Fig. 7 is a schematic cross-sectional structure of the supporting device of the present invention.
Fig. 8 is a schematic view of the alternate lifting of the first and second hydraulic jacks of the present invention.
Fig. 9a is a schematic view showing an initial state in which the first or second hydraulic jack is lifted by the supporting means.
Fig. 9b is a schematic view of a first preset displacement of the first or second hydraulic jack raised by the support means.
Fig. 9c is a schematic view of two first preset displacements of the first or second hydraulic jack raised by the support means.
Fig. 9d is a schematic view of three first preset displacements of the lifting of the first or second hydraulic jack by means of the support device.
Fig. 9e is a schematic view of four first preset displacements of the lifting of the first or second hydraulic jack with the support device.
Fig. 9f is a schematic view of lifting the outer tub.
Fig. 9g is a schematic view of stacking the pods under the support apparatus.
Description of the specification reference numerals:
100a, a first hydraulic jack; 100b, a second hydraulic jack; 200. a support device; 300. a hydraulic control system; 400. a structure to be lifted;
1. an oil cylinder; 2. a piston rod; 3. a driving mechanism; 4. a lock nut; 5. an antifriction plate; 6. a bolt; 7. a drive gear; 8. a limiting ring; 9. a screw; 10. a limiting cover;
210. an outer cylinder; 220. an inner cylinder; 230. an annular bracket; 240. a limiting block; 250. a telescopic rotating shaft; 251. a first helical gear; 260. a pull rope; 270. a rocker arm; 271. a transmission shaft; 272. a second helical gear; 280. and (5) cushion blocks.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the invention and practice it.
In the present invention, if directions (up, down, left, right, front and rear) are described, they are merely for convenience of description of the technical solution of the present invention, and do not indicate or imply that the technical features must be in a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, "a plurality of" means one or more, and "a plurality of" means two or more, and "greater than", "less than", "exceeding", etc. are understood to not include the present number; "above", "below", "within" and the like are understood to include this number. In the description of the present invention, the description of "first" and "second" if any is used solely for the purpose of distinguishing between technical features and not necessarily for the purpose of indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the present invention, unless clearly defined otherwise, terms such as "disposed," "mounted," "connected," and the like should be construed broadly and may be connected directly or indirectly through an intermediate medium, for example; the connecting device can be fixedly connected, detachably connected and integrally formed; can be mechanically connected, electrically connected or capable of communicating with each other; may be a communication between two elements or an interaction between two elements. The specific meaning of the words in the invention can be reasonably determined by a person skilled in the art in combination with the specific content of the technical solution.
Referring to fig. 1 to 2, the gapless continuous jacking method of the present invention comprises:
at least one group of first hydraulic jacks 100a and one group of second hydraulic jacks 100b are arranged at the lower end of the structure 400 to be lifted; wherein each group of the first hydraulic jacks 100a and each group of the second hydraulic jacks 100b are connected to a hydraulic control system 300, each group of the first hydraulic jacks 100a and each group of the second hydraulic jacks 100b can synchronously stretch and retract and lift the structure 400 to be lifted independently through the corresponding hydraulic control system 300, and a supporting device 200 for enabling the supporting device to vertically displace is arranged below each of the first hydraulic jacks 100a and each of the second hydraulic jacks 100b;
one of the first hydraulic jacks 100a and the second hydraulic jacks 100b is extended to lift the structure to be lifted to a predetermined height, and the other is retracted after being moved up to a predetermined position by the supporting device 200 and extended to be docked with the structure to be lifted 400, and the above-described process is alternately repeated.
Specifically, the method further comprises:
while each set of the first hydraulic jacks 100a is extended, each set of the second hydraulic jacks 100b is moved upward by the respective supporting means 200;
when each group of the first hydraulic jacks 100a extends to a first preset stroke, each group of the second hydraulic jacks 100b generates a first preset displacement upwards through the corresponding supporting device 200;
each group of the second hydraulic jacks 100b starts to extend, and each group of the first hydraulic jacks 100a is in an extending state continuously until each group of the first hydraulic jacks 100a starts to retract after each group of the second hydraulic jacks 100b is connected with the structure to be lifted;
when each group of the first hydraulic jacks 100a is retracted to the initial state, each group of the first hydraulic jacks 100a generates a second preset displacement upwards through the corresponding supporting device 200;
when each set of second hydraulic jacks 100b extends to a second preset stroke, each set of first hydraulic jacks 100a starts to extend, and each set of second hydraulic jacks 100b continues to be in an extending state until each set of second hydraulic jacks 100b starts to retract after each set of first hydraulic jacks 100a is connected to the structure to be lifted.
Specifically, the first preset stroke and the second preset stroke are equal.
Specifically, the first preset stroke is 2/3 of the total stroke of the first hydraulic jack 100a, and the second preset stroke is 2/3 of the total stroke of the second hydraulic jack 100b, in this embodiment, one total stroke is 10cm.
Specifically, the first preset displacement is equal to the first preset stroke, and the second preset displacement is twice as large as the first preset stroke or the second preset stroke.
Referring to fig. 3 to 5, the first and second hydraulic jacks 100a and 100b include:
the upper end of the oil cylinder 1 is a supporting part;
the lower end of the piston rod 2 is provided with a supporting base;
the lock nut 4 is connected to the piston rod 2 through threads and is provided with external teeth in the circumferential direction;
the limiting cover 10 is connected to the lower end of the oil cylinder 1 and covers the lock nut 4;
a driving mechanism 3, which comprises a driving gear 7 extending into the limit cover 10 and meshed with the external teeth of the lock nut 4, and is used for driving the lock nut 4 to move along the piston rod 2;
a limiting ring 8 connected to the piston rod 2 and located below the lock nut 4;
wherein, when the piston rod 2 is retracted, the lock nut 4 moves to a position contacting the limit ring 8; when the piston rod 2 is lifted, the lock nut 4 moves to a contact position with the limiting cover 10.
Specifically, the driving mechanism 3 may selectively drive a motor; a friction reducing plate 5 is arranged on the contact surface of the limiting ring 8 and the mechanical lock nut; the lock nut cover is fixedly connected with the oil cylinder 1 by adopting a screw 9; the gear is fixedly connected with the output shaft of the driving motor coaxially through a bolt 6.
When the first hydraulic jack 100a and the second hydraulic jack 100b are operated and the piston rod 2 of the oil cylinder 1 is retracted, as shown in the figure, the lock nut 4 is quickly loosened to pass over the piston rod 2, and reaches the position of the limiting ring 8 of the piston rod 2, so that the piston rod 2 is conveniently retracted.
In the lifting process of the oil cylinder 1 under load, a hydraulic motor is started, the hydraulic motor rotates in the positive direction to drive a driving gear 7 and a large gear of a lock nut 4 to rotate clockwise on a piston rod 2 of the hydraulic jack, so that a gap between the lock nut 4 and a limiting cover 10 generated when the piston rod 2 stretches out during lifting is eliminated, the function of automatically following the screwing of the lock nut 4 is achieved, and the lifting of the piston rod 2 of the oil cylinder 1 is tracked in real time to be synchronously screwed. If the oil pipe of the oil cylinder 1 or the sealing of the oil cylinder 1 is accidentally damaged at this moment, the locking nut 4 and the limiting cover 10 are automatically screwed tightly and attached all the time in the jacking process, so that the functions of instantly bearing and safely protecting structural weights are achieved.
Specifically, the structure to be lifted 400 includes a bridge beam body, the bridge beam body includes at least two lifting surfaces that are parallel to each other, and the first hydraulic jack 100a and the second hydraulic jack 100b are linearly distributed along the parallel surfaces and are arranged at intervals.
Referring to fig. 6 to 7, the supporting device 200 includes a pad 280 stacked under the first and second hydraulic jacks 100a and 100b, and the height of the pad 280 is equal to the first and/or second preset strokes;
and/or, the supporting device 200 includes:
an outer cylinder 210 arranged on the foundation, wherein a plurality of groups of locking inclined planes are circumferentially distributed on the side wall of the outer cylinder 210 along the axial direction;
the inner cylinder 220 is coaxially movable in the outer cylinder 210, the upper end of the inner cylinder 220 is used for connecting the first hydraulic jack 100a or the second hydraulic jack 100b, a connecting flange can be arranged at the upper end of the inner cylinder 220, a plurality of groups of notches corresponding to a plurality of groups of locking inclined planes are circumferentially distributed on the side wall of the inner cylinder 220 along the axial direction, and the distance between two groups of axially adjacent notches is equal to the first preset stroke and/or the second preset stroke;
the annular bracket 230 is connected in the inner cylinder 220 and is arranged corresponding to each group of notches;
the limiting mechanism comprises limiting blocks 240 which are elastically connected to the annular support 230 (can pass through springs) and correspond to the notches, a telescopic rotating shaft 250 coaxially arranged in the inner cylinder 220, a driving assembly for driving the telescopic rotating shaft 250 to rotate around the axis of the telescopic rotating shaft, and pull ropes 260 which are axially distributed on the telescopic rotating shaft 250 and are elastically connected with the limiting blocks 240 (can pass through springs), wherein the telescopic rotating shaft 250 is axially and slidably connected to the inner cylinder 220;
the pull rope 260 can be pulled or loosened by rotating the telescopic rotating shaft 250, so that the limiting block 240 stretches radially along the notch, when the pull rope 260 is loosened, the limiting block 240 can extend along the notch and slide radially along the outer cylinder 210 to a locking inclined plane position, and the inner wall of the inner cylinder 220 is locked and matched with the outer cylinder 210 through an inclined plane, so that the axial movement of the inner cylinder 220 is limited.
Through the arrangement, the inner cylinder 220 and the outer cylinder 210 can be matched, the inner cylinder 220 can ascend along with the load, meanwhile, the bearing energy of the inner cylinder 220 is transferred to the outer cylinder 210, the cushion block 280 can be reduced or avoided from being overlapped below the jack, and the efficiency is further improved.
In this embodiment, the telescopic shaft 250 is formed by sleeving an inner shaft and an outer shaft with each other; in order to solve the problem that the friction force is too large due to the fact that the inner cylinder 220 and the outer cylinder 210 are not coaxial, the outer cylinder 210 is not fixed with a foundation.
Specifically, the driving assembly comprises a rocker arm 270, a transmission shaft 271 is connected to the rocker arm 270, the telescopic rotating shaft 250 is provided with a first bevel gear 251, and the transmission shaft 271 is provided with a second bevel gear 272 matched with the bevel gear.
In this embodiment, since the height of the inner cylinder 220 is too high to affect the supporting stability, the extending height of the inner cylinder 220 is not very high, and is generally 5-10 first preset stroke heights; therefore, when the required jacking height of the structure to be jacked is greater than the maximum height of the inner cylinder 220 extending out of the outer cylinder 210, the outer cylinder 210 is lifted, and the cushion block 280 is stacked at the lower end of the outer cylinder 210, the whole supporting device 200 can be jacked continuously, and the process is shown in fig. 9a to 9 g.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present invention.
Claims (4)
1. The gapless continuous jacking method is characterized by comprising the following steps of:
at least one group of first hydraulic jacks (100 a) and one group of second hydraulic jacks (100 b) are arranged at the lower end of a structure (400) to be lifted; wherein each group of the first hydraulic jacks (100 a) and each group of the second hydraulic jacks (100 b) are connected to a hydraulic control system (300), each group of the first hydraulic jacks (100 a) and each group of the second hydraulic jacks (100 b) can synchronously stretch and retract and lift the structure (400) to be lifted independently through the corresponding hydraulic control system (300), and a supporting device (200) for enabling the first hydraulic jacks (100 a) and the second hydraulic jacks (100 b) to vertically displace is arranged below each;
one group of the first hydraulic jacks (100 a) and one group of the second hydraulic jacks (100 b) extend, the structure to be lifted is lifted to a preset height, the other group is retracted after being moved upwards to a preset position by a supporting device (200) and extended to be connected with the structure to be lifted (400), and the above processes are alternately repeated;
the method further comprises the steps of:
-each set of said second hydraulic jacks (100 b) is moved upwards by means of a respective support device (200) while each set of said first hydraulic jacks (100 a) is extended;
when each group of the first hydraulic jacks (100 a) extends to a first preset stroke, each group of the second hydraulic jacks (100 b) generates a first preset displacement upwards through a corresponding supporting device (200);
each group of second hydraulic jacks (100 b) starts to extend, and each group of first hydraulic jacks (100 a) is in an extending state continuously until each group of first hydraulic jacks (100 a) starts to retract after each group of second hydraulic jacks (100 b) is connected to the structure to be lifted;
when each group of the first hydraulic jacks (100 a) is retracted to an initial state, each group of the first hydraulic jacks (100 a) generates a second preset displacement upwards through a corresponding supporting device (200);
when each group of second hydraulic jacks (100 b) extends to a second preset stroke, each group of first hydraulic jacks (100 a) starts to extend, and each group of second hydraulic jacks (100 b) is continuously in an extending state until each group of first hydraulic jacks (100 a) is connected with the structure to be lifted, and each group of second hydraulic jacks (100 b) starts to retract;
the first preset stroke is equal to the second preset stroke;
the first preset stroke is 2/3 of the total stroke of the first hydraulic jack (100 a), and the second preset stroke is 2/3 of the total stroke of the second hydraulic jack (100 b);
the first preset displacement is equal to the first preset stroke, and the second preset displacement is twice as large as the first preset stroke or the second preset stroke;
the first hydraulic jack (100 a) and the second hydraulic jack (100 b) comprise:
the upper end of the oil cylinder (1) is a supporting part;
a piston rod (2) which is connected in a telescopic way in the oil cylinder (1) is arranged at the lower end of the piston rod;
the lock nut (4) is connected to the piston rod (2) through threads and is provided with external teeth in the circumferential direction;
the limiting cover (10) is connected to the lower end of the oil cylinder (1) and covers the locking nut (4);
the driving mechanism (3) comprises a driving gear (7) which extends into the limiting cover (10) and is meshed with the external teeth of the locking nut (4) so as to drive the locking nut (4) to move along the piston rod (2);
the limiting ring (8) is connected with the piston rod (2) and is positioned at the lower side of the locking nut (4);
wherein, when the piston rod (2) is retracted, the lock nut (4) moves to a position contacting the limiting ring (8); when the piston rod (2) is lifted, the lock nut (4) moves to a position contacting the limiting cover (10);
the supporting device (200) comprises a cushion block (280) stacked below the first hydraulic jack (100 a) and the second hydraulic jack (100 b), and the height of the cushion block (280) is equal to the first preset stroke and the second preset stroke;
the support device (200) further comprises:
an outer cylinder (210) arranged on the foundation, wherein a plurality of groups of locking inclined planes are circumferentially distributed on the side wall of the outer cylinder (210) along the axial direction;
the inner cylinder (220) is coaxially movable in the outer cylinder (210), the upper end of the inner cylinder (220) is used for being connected with the first hydraulic jack (100 a) or the second hydraulic jack (100 b), a plurality of groups of notches corresponding to a plurality of groups of locking inclined planes are circumferentially distributed on the side wall of the inner cylinder (220) along the axial direction, and the distance between two groups of axially adjacent notches is equal to the first preset stroke and/or the second preset stroke;
the annular bracket (230) is connected in the inner cylinder (220) and is arranged corresponding to each group of notches;
the limiting mechanism comprises limiting blocks (240) which are elastically connected to the annular support (230) and correspond to the notches, telescopic rotating shafts (250) which are coaxially arranged in the inner cylinder (220), driving components which drive the telescopic rotating shafts (250) to rotate around the axis of the telescopic rotating shafts, and pull ropes (260) which are axially distributed on the telescopic rotating shafts (250) and are elastically connected with the limiting blocks (240);
the pull rope (260) can be pulled or loosened through rotation of the telescopic rotating shaft (250), so that the limiting block (240) stretches radially along the notch, when the pull rope (260) is loosened, the limiting block (240) can extend along the notch and slide radially along the outer cylinder (210) to a locking inclined plane position, and the inner wall of the inner cylinder (220) is matched with the outer cylinder (210) through inclined plane locking to limit axial movement of the inner cylinder (220).
2. A gapless continuous jacking method as claimed in claim 1, wherein said structure to be jacked (400) comprises a bridge beam body comprising at least two jacking surfaces arranged in parallel, said first hydraulic jack (100 a) and said second hydraulic jack (100 b) being arranged in a straight line along said jacking surfaces and at intervals.
3. A gapless continuous jacking method as claimed in claim 1, wherein said drive assembly comprises a rocker arm (270), said rocker arm (270) being connected to a drive shaft (271), said telescopic shaft (250) being provided with a first bevel gear (251), said drive shaft (271) being provided with a second bevel gear (272) cooperating with said bevel gear.
4. A gapless continuous jacking method as claimed in claim 1, wherein said spacer blocks (280) are stacked at the lower end of said outer cylinder (210) when the required jacking height of said structure to be jacked is greater than the maximum height of said inner cylinder (220) extending beyond said outer cylinder (210).
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107542035A (en) * | 2017-09-13 | 2018-01-05 | 无锡厚发自动化设备有限公司 | A kind of bridge jacking system |
| CN109264613A (en) * | 2018-11-29 | 2019-01-25 | 上海同罡建筑工程有限公司 | A kind of continuous jack-up system of building and its jacking method |
| CN111943074A (en) * | 2020-08-07 | 2020-11-17 | 江苏万川液压机械设备有限公司 | Follow-up self-locking jack |
| CN212292622U (en) * | 2020-04-03 | 2021-01-05 | 建研科技股份有限公司 | Double-acting hydraulic jack with automatic rotating nut locking mechanism |
| CN115676624A (en) * | 2022-11-08 | 2023-02-03 | 无锡市思进工业自动化设备有限公司 | Automatic stacking and jacking device for large-scale structure |
-
2023
- 2023-06-15 CN CN202310707455.6A patent/CN116425072B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107542035A (en) * | 2017-09-13 | 2018-01-05 | 无锡厚发自动化设备有限公司 | A kind of bridge jacking system |
| CN109264613A (en) * | 2018-11-29 | 2019-01-25 | 上海同罡建筑工程有限公司 | A kind of continuous jack-up system of building and its jacking method |
| CN212292622U (en) * | 2020-04-03 | 2021-01-05 | 建研科技股份有限公司 | Double-acting hydraulic jack with automatic rotating nut locking mechanism |
| CN111943074A (en) * | 2020-08-07 | 2020-11-17 | 江苏万川液压机械设备有限公司 | Follow-up self-locking jack |
| CN115676624A (en) * | 2022-11-08 | 2023-02-03 | 无锡市思进工业自动化设备有限公司 | Automatic stacking and jacking device for large-scale structure |
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| CN116425072A (en) | 2023-07-14 |
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