CN110294427B - Method for replacing steel wire rope of main hoisting system of large tower crane - Google Patents
Method for replacing steel wire rope of main hoisting system of large tower crane Download PDFInfo
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- CN110294427B CN110294427B CN201910431871.1A CN201910431871A CN110294427B CN 110294427 B CN110294427 B CN 110294427B CN 201910431871 A CN201910431871 A CN 201910431871A CN 110294427 B CN110294427 B CN 110294427B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
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Abstract
The invention belongs to the technical field of constructional engineering, and particularly relates to a method for replacing a steel wire rope of a main hoisting system of a large tower crane, which is suitable for the large tower crane of power station construction engineering. The method adopts a tower crane main hoisting winch on a tower crane to provide hoisting power, and sequentially pulls a new steel wire rope, recovers an old steel wire rope, winds the new steel wire rope and winds a main hoisting system steel wire rope; the replacement of the main hoisting steel wire rope of the large-scale tower crane is completed under the condition that other hoisting machinery is not matched. The steel wire rope replacing work site is saved, the construction efficiency is improved, the construction progress of the building engineering is guaranteed from the side face, the operation is simple and convenient, the requirement on the technical skill of personnel is low, the construction safety of the personnel is guaranteed, in addition, the investment of mechanical equipment in each link is reduced, the environmental pollution is low, and the cost is reduced to a great extent.
Description
Technical Field
The invention belongs to the technical field of constructional engineering, and particularly relates to a method for replacing a steel wire rope of a main hoisting system of a large tower crane, which is suitable for the large tower crane of power station construction engineering.
Background
The tower crane plays an important role in the project construction of modern coal-fired power stations, and the phenomenon that the steel wire rope of a main hoisting system is scrapped can occur due to various reasons in the using process. The main hoisting steel wire rope of the tower crane is often replaced by the cooperation of other movable hoisting machinery to integrally remove the main hoisting mechanism of the tower crane and hoist the main hoisting mechanism off the ground, and the main hoisting mechanism is hoisted in place and installed again by the cooperation of the movable hoisting machinery after the steel wire rope is replaced on the ground. The large tower crane has higher requirements on the length and the tonnage of a movable hoisting mechanical arm needing to be matched because of higher height.
Disclosure of Invention
Aiming at the technical problems, the invention provides a method for replacing a steel wire rope of a main hoisting system of a large tower crane, which can rapidly complete the replacement of the main hoisting steel wire rope of the large tower crane under the condition of not needing the cooperation of other hoisting machinery.
The invention is realized by the following technical scheme:
a method for replacing a main hoisting system steel wire rope of a large tower crane adopts a tower crane main hoisting winch arranged on the tower crane to provide hoisting power, sequentially pulls a new steel wire rope, recovers an old steel wire rope, winds the new steel wire rope and penetrates through the main hoisting system steel wire rope, so that the old steel wire rope and the new steel wire rope mutually help to realize interchange, and the replacement of the main hoisting steel wire rope of the large tower crane can be completed without the cooperation of other hoisting machinery. Further, the method specifically comprises:
(1) construction preparation: all old steel wire ropes of a main hoisting system of the tower crane are received on a main hoisting winch drum of the tower crane; placing a new steel wire rope reel with a new steel wire rope and an empty steel wire rope reel for collecting old steel wire ropes on the ground below a tower crane balance arm;
defining one end of an old steel wire rope fixed on a winding drum of the main hoisting winch as an old steel wire rope A end, and the other end of the old steel wire rope fixed on the winding drum of the main hoisting winch as an old steel wire rope B end; defining one end of a new steel wire rope fixed on the new steel wire rope reel as a new steel wire rope A end, and the other end of the new steel wire rope fixed on the new steel wire rope reel as a new steel wire rope B end;
(2) and (3) dragging the new steel wire rope: connecting the end B of an old steel wire rope with one end of a guide rope, and sliding the other end of the guide rope onto the ground; the main hoisting winch of the tower crane starts to pay off the rope, simultaneously drags and draws a guide rope sliding to the ground, and takes the guide rope as a guide to enable an old steel wire rope to fall down according to the required space and direction until the end B of the old steel wire rope falls to the position of a new steel wire rope reel on the ground, the main hoisting winch of the tower crane stops paying off the rope, the end B of the old steel wire rope is disconnected with the guide rope, and the end B of the old steel wire rope is connected with the end B of a new steel wire rope;
the tower crane main hoisting winch starts to take up the rope, the B end of the new steel wire rope is lifted to the position of the tower crane main hoisting winch, a section of new steel wire rope at the lower part of the B end of the new steel wire rope is fixed on a tower crane balance arm frame near the tower crane main hoisting winch, and the connection between the B end of the old steel wire rope and the B end of the new steel wire rope is removed;
connecting the end B of the old steel wire rope with one end of a guide rope, and sliding the other end of the guide rope onto the ground;
(3) and (3) recovering the old steel wire rope: the main hoisting winch of the tower crane starts to pay off the rope, simultaneously pulls the guide rope which slips to the ground, and takes the guide rope as the guide to enable the old steel wire rope to fall down according to the required space and direction until the end B of the old steel wire rope falls to the position of the empty steel wire rope drum on the ground, the main hoisting winch of the tower crane stops paying off the rope, the connection between the end B of the old steel wire rope and the guide rope is untied, and the end B of the old steel wire rope is fixed on the empty steel wire rope drum;
the tower crane main lifts the winch to continue releasing the rope, rotates the empty steel wire rope reel and orderly winds the old steel wire rope onto the empty steel wire rope reel; when the old steel wire rope has a certain length on the main hoisting winch of the tower crane, fixing a section of the old steel wire rope at the lower part of the A end of the old steel wire rope on a balance arm frame of the tower crane near the main hoisting winch, and then removing the A end of the old steel wire rope from a fixed point on a winding drum of the main hoisting winch;
(4) winding a new steel wire rope: fixing the B end of a new steel wire rope on a main hoisting winch of the tower crane, removing the connection between the new steel wire rope and a balance arm frame of the tower crane, and starting to take up the rope by the main hoisting winch of the tower crane until the new steel wire rope is completely wound on a winding drum of the main hoisting winch of the tower crane;
connecting the A end of a new steel wire rope with the A end of an old steel wire rope, removing the connection between the A end of the old steel wire rope and a balance arm frame of a tower crane, starting releasing the rope by a main hoisting winch of the tower crane, and orderly and completely dropping the old steel wire rope on the ground and winding the old steel wire rope on a corresponding empty steel wire rope winding drum; the connection between the A end of the new steel wire rope and the A end of the old steel wire rope is removed, and the main hoisting winch starts to take up the rope until the new steel wire rope is completely wound on a winding drum of the main hoisting winch;
(5) threading and winding of a steel wire rope of a main hoisting system of the tower crane: and (5) penetrating and winding the steel wire rope of the main hoisting system, and finishing construction.
Further, the step (2) of connecting the B end of the old steel wire rope with the B end of the new steel wire rope and the step (4) of connecting the a end of the new steel wire rope with the a end of the old steel wire rope specifically include:
overlapping the A end of the new steel wire rope with the A end of the old steel wire rope, or overlapping the B end of the new steel wire rope with the B end of the old steel wire rope; the total length of the lap joint is 1000-1500mm, the lap joint is fixed by a plurality of steel wire rope chucks, and the distance between every two adjacent steel wire rope chucks is 6-7 times of the diameter of the steel wire rope.
Further, in the construction preparation process in the step (1), the tower crane is operated to rotate the balance arm of the tower crane to a position which is relatively open to the lower ground; and setting the new wire rope reel and the empty wire rope reel on the empty ground below the balance arm of the tower crane.
Further, in the step (2) of drawing the new steel wire rope, the new steel wire rope at the lower part of the B end of the new steel wire rope is fixed on a balance arm frame of the tower crane near a main hoisting winch of the tower crane, and the method specifically comprises the following steps: and fixing the new steel wire rope at the position of not less than 3m below the B end of the new steel wire rope on a tower crane balance arm frame near the main hoisting winch through a steel wire rope head, a shackle and a steel wire rope chuck.
Further, in the step (3) of recovering the old steel wire rope, the step of fixing the old steel wire rope at the lower part of the end a of the old steel wire rope on the boom of the tower crane balance arm near the main hoisting winch specifically comprises the following steps: when the old steel wire rope is remained for 2-5m on the main hoisting winch of the tower crane, the old steel wire rope 3m below the A end of the old steel wire rope (namely the fixed point of the old steel wire rope on the winding drum of the main hoisting winch) is fixed on a balance arm frame of the tower crane near the main hoisting winch through a steel wire rope head, a shackle and a steel wire rope chuck.
Further, the guide ropes in the step (2) and the step (3) adopt hemp ropes; the length of the guide rope is greater than the height of the large tower crane.
The invention has the beneficial technical effects that:
the method provided by the invention can rapidly complete the replacement of the main hoisting steel wire rope of the large-scale tower crane under the condition of not needing the cooperation of other hoisting machinery; the construction method has the advantages that the working site for replacing the steel wire rope is saved, the construction efficiency is improved, the construction progress of the building engineering is ensured from the side, the operation is simple and convenient, the requirement on the technical skill of personnel is lower, the construction safety of the personnel is ensured, in addition, the investment of mechanical equipment in each link is reduced, the environmental pollution is less, and the cost is reduced to a great extent; compared with the conventional method, the method is more time-saving, labor-saving and economical, and is suitable for replacing the main hoisting steel wire ropes of various large and medium-sized tower cranes and the steel wire ropes of various high-altitude winches.
Drawings
FIG. 1 is a schematic flow chart of a method for replacing a steel wire rope of a main hoisting system of a large tower crane according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a preparation stage of the method in an embodiment of the invention;
FIG. 3 is a schematic diagram of the stages in the process of pulling a new wire rope according to an embodiment of the invention;
FIG. 4 is a schematic diagram of the stage of recovering old steel wire ropes according to the method of the embodiment of the present invention;
FIG. 5 is a schematic diagram of a new wire rope winding stage according to the method of the present invention;
FIG. 6 is a schematic view of a lap joint structure of a new steel cord and an old steel cord in an embodiment of the present invention;
reference numerals: 1. a tower crane; 2. a tower crane main hoisting winch; 3-1, an A end of an old steel wire rope; 3-2, the B end of the old steel wire rope; 4. an empty wire rope drum; 5. a new wire rope drum; 6-1, new steel wire rope B end; 6-2, a new steel wire rope A end; 7. a tower crane balance arm frame.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
On the contrary, the invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in the following detailed description of the present invention, certain specific details are set forth in order to provide a better understanding of the present invention. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details.
Aiming at the problems that in the prior art, the main hoisting steel wire rope of the tower crane is replaced, other movable hoisting machinery is often matched to integrally remove the main hoisting mechanism of the tower crane and lift the main hoisting mechanism off the ground, and the movable hoisting machinery is matched to re-lift the main hoisting mechanism in place and install the main hoisting mechanism after the steel wire rope is replaced on the ground; the large tower crane has higher requirements on the length and the tonnage of a movable hoisting mechanical arm needing to be matched due to higher height.
As shown in fig. 1, the invention provides a method for replacing a steel wire rope of a main hoisting system of a large tower crane, which specifically comprises the following steps:
(1) construction preparation: all old steel wire ropes of a main hoisting system of the tower crane are received on a main hoisting winch drum of the tower crane; placing a new steel wire rope reel with a new steel wire rope and an empty steel wire rope reel for collecting old steel wire ropes on the ground below a tower crane balance arm;
defining one end of an old steel wire rope fixed on a winding drum of the main hoisting winch as an old steel wire rope A end, and the other end of the old steel wire rope fixed on the winding drum of the main hoisting winch as an old steel wire rope B end; defining one end of a new steel wire rope fixed on the new steel wire rope reel as a new steel wire rope A end, and the other end of the new steel wire rope fixed on the new steel wire rope reel as a new steel wire rope B end;
(2) and (3) dragging the new steel wire rope: connecting the end B of an old steel wire rope with one end of a guide rope, and sliding the other end of the guide rope onto the ground; the main hoisting winch of the tower crane starts to pay off the rope, simultaneously drags and draws a guide rope sliding to the ground, and takes the guide rope as a guide to enable an old steel wire rope to fall down according to the required space and direction until the end B of the old steel wire rope falls to the position of a new steel wire rope reel on the ground, the main hoisting winch of the tower crane stops paying off the rope, the end B of the old steel wire rope is disconnected with the guide rope, and the end B of the old steel wire rope is connected with the end B of a new steel wire rope;
the tower crane main hoisting winch starts to take up the rope, the B end of the new steel wire rope is lifted to the position of the tower crane main hoisting winch, a section of new steel wire rope at the lower part of the B end of the new steel wire rope is fixed on a tower crane balance arm frame near the tower crane main hoisting winch, and the connection between the B end of the old steel wire rope and the B end of the new steel wire rope is removed;
connecting the end B of the old steel wire rope with one end of a guide rope, and sliding the other end of the guide rope onto the ground;
(3) and (3) recovering the old steel wire rope: the main hoisting winch of the tower crane starts to pay off the rope, simultaneously pulls the guide rope which slips to the ground, and takes the guide rope as the guide to enable the old steel wire rope to fall down according to the required space and direction until the end B of the old steel wire rope falls to the position of the empty steel wire rope drum on the ground, the main hoisting winch of the tower crane stops paying off the rope, the connection between the end B of the old steel wire rope and the guide rope is untied, and the end B of the old steel wire rope is fixed on the empty steel wire rope drum;
the tower crane main lifts the winch to continue releasing the rope, rotates the empty steel wire rope reel and orderly winds the old steel wire rope onto the empty steel wire rope reel; when the old steel wire rope has a certain length on the main hoisting winch of the tower crane, fixing a section of the old steel wire rope at the lower part of the A end of the old steel wire rope on a balance arm frame of the tower crane near the main hoisting winch, and then removing the A end of the old steel wire rope from a fixed point on a winding drum of the main hoisting winch;
(4) winding a new steel wire rope: fixing the B end of a new steel wire rope on a main hoisting winch of the tower crane, removing the connection between the new steel wire rope and a balance arm frame of the tower crane, and starting to take up the rope by the main hoisting winch of the tower crane until the new steel wire rope is completely wound on a winding drum of the main hoisting winch of the tower crane;
connecting the A end of a new steel wire rope with the A end of an old steel wire rope, removing the connection between the A end of the old steel wire rope and a balance arm frame of a tower crane, starting releasing the rope by a main hoisting winch of the tower crane, and orderly and completely dropping the old steel wire rope on the ground and winding the old steel wire rope on a corresponding empty steel wire rope winding drum; the connection between the A end of the new steel wire rope and the A end of the old steel wire rope is removed, and the main hoisting winch starts to take up the rope until the new steel wire rope is completely wound on a winding drum of the main hoisting winch;
(5) threading and winding of a steel wire rope of a main hoisting system of the tower crane: and (5) penetrating and winding the steel wire rope of the main hoisting system, and finishing construction.
In this embodiment, the steel wire rope of the main hoisting system of QTZ2000(ZSC70240-062) type 80t tower crane manufactured by Nanjing Zhongsheng is replaced by an example, and the tower crane has the largest hoisting capacityThe lifting height is 127m, and the height of the main hoisting winch is 137 m; specification of the steel wire rope of the main hoisting system: 15TX7+ IWR-
The diameter of the steel wire rope: 36 mm; length of the steel wire rope: 660 m; the specific implementation method comprises the following steps:
(1) a construction preparation step, as shown in fig. 2, all old steel wire ropes of a main hoisting system of a tower crane (namely, a tower crane) are received on a winding drum of a main hoisting winch of the tower crane, and a specific operation method is executed according to the specification of the corresponding tower crane; defining one end of an old steel wire rope fixed on a winding drum of the main hoisting winch as an old steel wire rope A end, and the other end of the old steel wire rope fixed on the winding drum of the main hoisting winch as an old steel wire rope B end;
operating the tower crane to rotate, and rotating the balance arm of the tower crane to a position where the ground is open;
arranging a new steel wire rope reel with a new steel wire rope and a support on the open ground below a main hoisting winch of the tower crane, and arranging a set of empty steel wire rope reel and a support near the new steel wire rope reel; the new wire rope reel and the empty wire rope reel are not required to be arranged under a winch of a main hoisting system of the tower crane and need to be staggered as much as possible so as to avoid vertical crossing operation. The new steel wire rope is wound on the new steel wire rope reel, one end of the new steel wire rope fixed on the new steel wire rope reel is defined as a new steel wire rope A end, and the other end of the new steel wire rope fixed on the new steel wire rope reel is defined as a new steel wire rope B end;
preparing tools and materials, setting a safety warning area in a pulling mode, arranging personnel monitoring, carrying out technology and safety intersection on operating personnel and the like.
(2) And (3) dragging the new steel wire rope: and connecting the B end of the old steel wire rope completely wound on the drum of the main hoisting winch of the tower crane with one end of the guide rope in a knotting mode, and slowly sliding the other end of the wire rope to the ground from one side of the main hoisting winch of the tower crane. In the embodiment, the guide rope is a hemp rope with the length of 150m, the length of the hemp rope is greater than the height of the large tower crane, and the diameter of the hemp rope is 30 mm; the knotting mode of the connection part of the hemp rope and the steel wire rope has no special requirement, and the hemp rope only plays a role in guiding when the steel wire rope descends so as to prevent the steel wire rope from interfering with equipment, structures and the like below in the descending process.
And commanding the tower crane to hoist the main crane to unwind the rope, arranging two persons on the ground to drag the lower end of the hemp rope, using the hemp rope as a guide to enable the old steel wire rope to slowly fall down according to the required space and direction until the end B of the steel wire rope on the tower crane main hoisting winch descends to the ground and is guided to the position of the new steel wire rope reel through the hemp rope, and stopping the rope unwinding of the tower crane main hoisting winch. The connection between the B end of the old steel wire rope and the hemp rope is untied, and as shown in fig. 6, the B end of the new steel wire rope is lapped with the B end of the old steel wire rope; the total length of the lap joint is 1000-1500mm, the lap joint is fixed by a plurality of steel wire rope chucks, and the distance between every two adjacent steel wire rope chucks is 6-7 times of the diameter of the steel wire rope; preferably, the end of the old steel cord B is connected to the end of the new steel cord B by 5 steel cord clamps of 40 mm.
As shown in fig. 3, an 80t tower crane main hoisting winch is commanded to take up the rope, and 4 persons cooperate to rotate a new steel wire rope reel on the ground until the end part of a new steel wire rope B is lifted to the position of the tower crane main hoisting winch. The lower part of the B end of the new steel wire rope is not less than 3m and is fixed on a tower crane balance arm frame near a main hoisting winch through 1 steel wire rope head with the diameter of 24mm and the length of 2m, 1 shackle with the length of 5t and 3 steel wire rope clamps with the length of 40 mm. After the rope head of the steel wire rope is wound around a balance arm frame of the tower crane, two ends of the rope head of the steel wire rope are connected through shackles to form a steel wire rope ring surrounding the balance arm frame of the tower crane, and then a new steel wire rope at the lower part of the B end of the new steel wire rope is fixedly connected with the steel wire rope ring through a steel wire rope clamping head;
and (3) removing the connection between the B end of the old steel wire rope and the B end of the new steel wire rope, connecting the B end of the old steel wire rope with one end of a hemp rope (with the diameter of 30mm) with the length of 150m in a knotting mode, and slowly sliding the other end of the hemp rope to the ground from the outer side of a main hoisting winch of the tower crane. The knotting mode of the connection part of the hemp rope and the steel wire rope has no special requirement, and the hemp rope only plays a role in guiding when the steel wire rope descends so as to prevent the steel wire rope from interfering with equipment, structures and the like below in the descending process. The knotting mode of the connection part of the hemp rope and the steel wire rope has no special requirement, and the hemp rope only plays a role in guiding when the steel wire rope descends so as to prevent the steel wire rope from interfering with equipment, structures and the like below in the descending process.
(3) And (3) recovering the old steel wire rope:
and commanding the tower crane to lift the winch to pay off the rope, arranging two persons on the ground to drag the lower end of the hemp rope, using the hemp rope as a guide to enable the old steel wire rope to slowly fall down according to the required space and direction until the B end of the old steel wire rope on the tower crane main lifting winch descends to the ground and is guided to the position of an empty steel wire rope reel prepared on the ground in advance through the hemp rope, and stopping the rope paying off of the tower crane main lifting winch. And (5) the connection between the end B of the old steel wire rope and the hemp rope is untied, and the end part of the old steel wire rope B is fixed at the corresponding position of the empty steel wire rope reel.
As shown in fig. 4, the rope is released by continuously operating the main winch of the tower crane, 4 persons on the ground cooperate to rotate the empty steel wire rope reel, and the old steel wire rope is orderly wound on the empty steel wire rope reel. Until the old steel wire rope has 2 circles (about 3m) on the main hoisting winch of the tower crane, the old steel wire rope passes through 1 steel wire rope head with the diameter of 24mm and the length of 2m, 1 shackle with the length of 5t and 3 steel wire rope chucks with the length of 40mm at the position 3m below a fixed point (namely the A end of the old steel wire rope) on the winding drum of the main hoisting winch and is fixed on a balance arm frame of the tower crane near the main hoisting winch. After a steel wire rope head is wound around a balance arm frame of a tower crane, two ends of the steel wire rope head are connected through shackles to form a steel wire rope ring surrounding the balance arm frame of the tower crane, and then a new steel wire rope at the lower part of the A end of an old steel wire rope is fixedly connected with the steel wire rope ring through a steel wire rope clamping head;
and continuously operating the main hoisting winch of the tower crane to release the rope, guiding the A end of the old steel wire rope to be completely loosened and exposed, and dismantling the connection pair of the A end of the old steel wire rope and the main hoisting winch of the tower crane.
(4) Winding a new steel wire rope: as shown in fig. 5, fixing the B end of the new wire rope at a fixing point of the tower crane main hoisting winch, and then commanding the tower crane main hoisting system winch to wind the rope until the new wire rope is completely wound on the 80t tower crane main hoisting winch drum;
as shown in fig. 6, the a end of the new steel wire rope is connected with the a end of the old steel wire rope through the steel wire rope clamps, specifically, the a end of the new steel wire rope is lapped with the a end of the old steel wire rope, the total length of the lap joint is 1000-1500mm, 5 steel wire rope clamps with the length of 40mm are adopted to fix the lap joint, and the distance between the adjacent steel wire rope clamps is 6-7 times of the diameter of the steel wire rope.
Commanding a tower crane to lift a winch to pay off a rope, and 4 persons on the ground cooperate to rotate a steel wire rope reel, so that the old steel wire rope is orderly and completely dropped on the ground and wound on the corresponding steel wire rope reel;
and removing the connection between the old steel wire rope and the new steel wire rope, and commanding the main hoisting winch to take up the rope until the new steel wire rope is completely wound on the main hoisting winch drum.
(5) Threading and winding of a steel wire rope of a main hoisting system of the tower crane: and according to the steps and requirements shown in the specification of the tower crane, the steel wire rope of the main hoisting system is wound in a penetrating way, and the construction is finished.
And (5) finishing construction: and (5) after construction, cleaning all garbage on the construction site, recovering tools and instruments, and finishing work, material exhaustion and site cleaning.
In addition, the method is applied to the replacement of the steel wire rope of the main hoisting system of the 80t tower crane on the side of the No. 2 boiler of the Bakis Cacem coal-fired power plant project, and the accumulated time is 13 hours from the beginning of preparation work to the completion of construction and the arrival of the tower crane at the commissioning condition (including the rope collection of the old steel wire rope of the main hoisting system of the tower crane and the rethreading of the newly replaced steel wire rope). The diameter of the steel wire rope of the main hoisting system of the tower crane is 36mm, the length of the steel wire rope is 66m, and the weight of the steel wire rope is about 3.4 t.
The method is safe, efficient, simple and economical, and is suitable for replacing the steel wire ropes of medium and large tower cranes and other similar mechanical equipment. The whole process has low requirements on tools, operators and the like, has general real-time performance, and can control the implementation process. The current industry needs to rapidly and safely solve the practical problem of the scientific and technological achievement.
In the implementation process of the method, consumable materials are not needed, the used tools, materials and the like have turnover and universality, and any special materials or tools are not needed; the whole process needs 6 operators to cooperate, and no special skill requirement is required on the operators. The power of a winch of a main hoisting system of the tower crane is mainly used in the implementation process of the scientific and technological achievement, and the construction period is short. The method provided by the invention is mainly matched with the power and manpower of the main hoisting system of the tower crane in the implementation process, and has certain energy-saving benefit.
Claims (6)
1. A method for replacing a main hoisting system steel wire rope of a large tower crane is characterized in that a tower crane main hoisting winch arranged on the tower crane is adopted to provide hoisting power, a new steel wire rope is pulled, an old steel wire rope is recovered, the new steel wire rope is wound, and the main hoisting system steel wire rope is wound in a penetrating mode, so that the old steel wire rope and the new steel wire rope can mutually help to realize interchange, and the replacement of the main hoisting steel wire rope of the large tower crane can be completed without the cooperation of other hoisting machinery, and the specific method comprises the following steps:
(1) construction preparation: all old steel wire ropes of a main hoisting system of the tower crane are received on a main hoisting winch drum of the tower crane; placing a new steel wire rope reel with a new steel wire rope and an empty steel wire rope reel for collecting old steel wire ropes on the ground below a tower crane balance arm;
defining one end of an old steel wire rope fixed on a winding drum of the main hoisting winch as an old steel wire A end, and the other end of the old steel wire rope fixed on the winding drum of the main hoisting winch as an old steel wire B end; defining one end of a new steel wire rope fixed on the new steel wire rope reel as a new steel wire rope A end, and the other end of the new steel wire rope fixed on the new steel wire rope reel as a new steel wire rope B end;
(2) and (3) dragging the new steel wire rope: connecting the end B of an old steel wire rope with one end of a guide rope, and sliding the other end of the guide rope onto the ground; the main hoisting winch of the tower crane starts to pay off the rope, simultaneously drags and draws a guide rope sliding to the ground, and takes the guide rope as a guide to enable an old steel wire rope to fall down according to the required space and direction until the end B of the old steel wire rope falls to the position of a new steel wire rope reel on the ground, the main hoisting winch of the tower crane stops paying off the rope, the end B of the old steel wire rope is disconnected with the guide rope, and the end B of the old steel wire rope is connected with the end B of a new steel wire rope;
the tower crane main hoisting winch starts to take up the rope, the B end of the new steel wire rope is lifted to the position of the tower crane main hoisting winch, a section of new steel wire rope at the lower part of the B end of the new steel wire rope is fixed on a tower crane balance arm frame near the tower crane main hoisting winch, and the connection between the B end of the old steel wire rope and the B end of the new steel wire rope is removed;
connecting the end B of the old steel wire rope with one end of a guide rope, and sliding the other end of the guide rope onto the ground;
(3) and (3) recovering the old steel wire rope: the main hoisting winch of the tower crane starts to pay off the rope, simultaneously pulls the guide rope which slips to the ground, and takes the guide rope as the guide to enable the old steel wire rope to fall down according to the required space and direction until the end B of the old steel wire rope falls to the position of the empty steel wire rope reel on the ground, the main hoisting winch of the tower crane stops paying off the rope, the connection between the end B of the old steel wire rope and the guide rope is untied, and the end B of the old steel wire rope is fixed on the empty steel wire rope reel;
the tower crane main lifts the winch to continue releasing the rope, rotates the empty steel wire rope reel and orderly winds the old steel wire rope onto the empty steel wire rope reel; when the old steel wire rope has a certain length on the main hoisting winch of the tower crane, fixing a section of the old steel wire rope at the lower part of the A end of the old steel wire rope on a balance arm frame of the tower crane near the main hoisting winch, and then removing the A end of the old steel wire rope from a fixed point on a winding drum of the main hoisting winch;
(4) winding a new steel wire rope: fixing the B end of a new steel wire rope on a main hoisting winch of the tower crane, removing the connection between the new steel wire rope and a balance arm frame of the tower crane, and starting to take up the rope by the main hoisting winch of the tower crane until the new steel wire rope is completely wound on a winding drum of the main hoisting winch of the tower crane;
connecting the A end of a new steel wire rope with the A end of an old steel wire rope, removing the connection between the A end of the old steel wire rope and a balance arm frame of a tower crane, starting releasing the rope by a main hoisting winch of the tower crane, and orderly and completely dropping the old steel wire rope on the ground and winding the old steel wire rope on a corresponding empty steel wire rope winding drum; the connection between the A end of the new steel wire rope and the A end of the old steel wire rope is removed, and the main hoisting winch starts to take up the rope until the new steel wire rope is completely wound on a winding drum of the main hoisting winch;
(5) threading and winding of a steel wire rope of a main hoisting system of the tower crane: and (5) threading the new steel wire rope to the main hoisting system, and finishing construction.
2. The method for replacing the steel wire rope of the main hoisting system of the large tower crane according to claim 1, wherein the step (2) of connecting the B end of the old steel wire rope with the B end of the new steel wire rope and the step (4) of connecting the a end of the new steel wire rope with the a end of the old steel wire rope are specifically as follows:
overlapping the A end of the new steel wire rope with the A end of the old steel wire rope, or overlapping the B end of the new steel wire rope with the B end of the old steel wire rope; the total length of the lap joint is 1000-1500mm, the lap joint is fixed by a plurality of steel wire rope chucks, and the distance between every two adjacent steel wire rope chucks is 6-7 times of the diameter of the steel wire rope.
3. The method for replacing the steel wire rope of the main hoisting system of the large tower crane according to claim 1, wherein in the construction preparation process in the step (1), the tower crane is operated to rotate the balance arm of the tower crane to a position where the lower ground is relatively open; and setting the new wire rope reel and the empty wire rope reel on the empty ground below the balance arm of the tower crane.
4. The method for replacing the steel wire rope of the main hoisting system of the large tower crane according to claim 1, wherein in the step (2) of pulling the new steel wire rope, a section of the new steel wire rope at the lower part of the B end of the new steel wire rope is fixed on a tower crane balance arm frame near a tower crane main hoisting winch, and specifically comprises the following steps: and fixing the new steel wire rope at the position of not less than 3m below the B end of the new steel wire rope on a tower crane balance arm frame near the main hoisting winch through a steel wire rope head, a shackle and a steel wire rope chuck.
5. The method for replacing the steel wire rope of the main hoisting system of the large tower crane according to claim 1, wherein in the step (3) of recovering the old steel wire rope, a section of the old steel wire rope at the lower part of the A end of the old steel wire rope is fixed on a tower crane balance arm frame near a main hoisting winch, and the method comprises the following steps: when the old steel wire rope is left for 2-5m on the main hoisting winch of the tower crane, the old steel wire rope at least 3m below the A end of the old steel wire rope is fixed on a balance arm frame of the tower crane near the main hoisting winch through a steel wire rope head, a shackle and a steel wire rope chuck.
6. The method for replacing the steel wire rope of the main hoisting system of the large tower crane according to claim 1, wherein the guide rope in the steps (2) and (3) is hemp rope; the length of the guide rope is greater than the height of the large tower crane.
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| CN113845052A (en) * | 2021-10-15 | 2021-12-28 | 攀钢集团西昌钢钒有限公司 | Steel rope replacing method and steel rope replacing device |
| CN115180531A (en) * | 2022-07-29 | 2022-10-14 | 徐州建机工程机械有限公司 | Spatial layout structure for non-twisting of tower crane hoisting steel wire rope |
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| CN203284100U (en) * | 2013-06-05 | 2013-11-13 | 山东淄建集团有限公司 | Tower crane achieving automatic replacement of steel wire rope |
| CN205855858U (en) * | 2016-08-15 | 2017-01-04 | 欧阳致远 | A kind of derrick crane hoist rope passes around system |
| CN207175292U (en) * | 2017-09-22 | 2018-04-03 | 抚顺永茂建筑机械有限公司 | Derrick crane raising wiring system |
| CN109279519B (en) * | 2018-10-11 | 2020-04-21 | 湖北江汉建筑工程机械有限公司 | Method for replacing steel wire rope of tower crane hoisting mechanism |
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