Hoisting device and method for full-caliber pile foundation reinforcement cage

Abstract

The device comprises an I-shaped steel hanging bracket, distance adjusting trolleys and a hanging tool, the I-shaped steel hanging bracket comprises a transverse support and a longitudinal support which are perpendicularly intersected, the distance adjusting trolleys are installed on the transverse support and the longitudinal support respectively, and the distance adjusting trolleys are connected with the pile foundation reinforcement cage to be hoisted through the hanging tool; the annular reinforcing ring is made of I-shaped steel, the two ends of the transverse support and the two ends of the longitudinal support are connected with the inner circumferential face of the annular reinforcing ring respectively, the safety in the hoisting process and the installation quality of the reinforcement cage can be improved, repeated utilization can be achieved, and the construction cost is saved.

Description

Technical Field

[0001] The invention belongs to the technical field of steel structure beam hoisting, and in particular relates to a device and method for hoisting a full-diameter pile foundation steel cage. Background Art

[0002] Reinforced concrete bored piles are widely used in industrial and civil construction, railways, highways and other construction fields. Lowering the steel cage into the borehole is a very important step in the construction of bored piles.

[0003] The steel cage is a prefabricated concrete component, usually used to strengthen the earthquake resistance and pressure bearing capacity of concrete structures. The steel cage is usually columnar and is welded from three parts: cross bars, longitudinal bars and stirrups. During the construction of cast-in-place piles, the steel cage is first hoisted into the pile hole, and then the conduit is inserted for concrete pouring. During the hoisting process of the steel cage, efficient and safe hoisting equipment should be used as much as possible.

[0004] There are two traditional methods for lifting steel cages: Method 1: Reinforce the lifting point of the steel cage with steel bars in the horizontal direction, form a certain angle between the main hook wire rope and the steel cage, and slowly lift it. At the same time, the auxiliary hook of the crane lifts the lower part of the steel cage, cooperates with the main hook to stand up the steel cage, and then uses the main hook to lower the steel cage to the hole mouth; Method 2: Use H-shaped steel to make a shoulder pole sling. The main hook wire rope is parallel to the main reinforcement of the steel cage. The main hook uses the shoulder pole to lift the steel cage. At the same time, the auxiliary hook of the crane lifts the lower part of the steel cage, cooperates with the main hook to stand up the steel cage, and then uses the main hook to lower the steel cage to the hole mouth. Method 1 The steel wire rope is hoisted at a certain angle to the steel cage, which is likely to cause deformation of the steel cage, affect the quality of the steel cage, and the steel cage is also easy to fall off, causing safety accidents. Method 2 The lifting device cannot be adjusted according to the cage diameter of the steel cage and the thickness of the steel bars. If you encounter steel cages with different diameters and steel bars, you need to customize the lifting device, which reduces construction efficiency. At the same time, both methods require the cooperation of the crane's auxiliary hook to erect the steel cage, which will cause the steel cage to shake violently and is unsafe.

[0005] Chinese patent CN116838115A proposes a steel cage hoisting device and a steel cage hoisting method, wherein a first adjusting device and a second adjusting device are arranged along the length direction of the steel bar. The steel bars of different sizes are fixed by adjusting the clamping of the first adjusting device and the second adjusting device respectively. Steel cages of different diameters and specifications can be hoisted, but the device cannot be reused and the stability of the steel cage during erection cannot be guaranteed.

[0006] Chinese patent CN219469427U proposes a construction steel cage hoisting pole, which uses a steel clamp sleeve to achieve the hoisting and locking of the steel cage, greatly improving the preparation speed before lifting the steel cage. However, it can only be used for lifting a steel cage of one specification, and cannot guarantee the stability of the steel cage during the erection process. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a device and method for lifting a full-diameter pile foundation steel cage in response to the above-mentioned problems. The device climbs the column to the vicinity of the positioning point through the dynamic control device of the arms and legs of a mimicking human, and then simulates the manual positioning method through a mechanical arm.

[0008] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a full-diameter pile foundation steel cage hoisting device, characterized in that it includes an I-beam hanger, a distance-adjusting trolley and a hoisting device, the I-beam hanger includes a vertically intersecting transverse support and a longitudinal support, the distance-adjusting trolley is respectively installed on the transverse support and the longitudinal support, and the distance-adjusting trolley is connected to the pile foundation steel cage to be hoisted through the hoisting device.

[0009] According to the above scheme, it also includes an annular reinforcement ring, which is made of I-beams, and the two ends of the transverse bracket and the longitudinal bracket are respectively connected to the inner circumference of the annular reinforcement ring.

[0010] According to the above scheme, the distance-adjusting trolley includes a U-shaped base and running wheels. The running wheels are respectively installed on both sides of the top of the U-shaped base through bearings. The running wheels on both sides are respectively configured to abut against the lower flange of the I-beam hanger and run along the lower flange of the I-beam hanger. A hook is provided at the bottom center of the U-shaped base.

[0011] According to the above scheme, the lifting device is a hand chain hoist, the top of the hand chain hoist is connected to the hook of the traveling wheel, and the bottom of the hand chain hoist is connected to the pile foundation reinforcement cage to be lifted.

[0012] According to the above scheme, the two sides of the walking wheel are stopped and positioned by a limiting mechanism, and the limiting mechanism includes a U-shaped limiting frame and a fastening bolt. The opening side of the U-shaped limiting frame is arranged toward the lower flange of the I-beam hanger, and the fastening bolt passes through the upper top plate of the U-shaped limiting frame and abuts against the top surface of the lower flange. The lower bottom plate of the U-shaped limiting frame is arranged in contact with the bottom surface of the lower flange, and by tightening the fastening nut configured with the fastening bolt, a clamping state is formed with the lower flange.

[0013] According to the above scheme, on the I-beam hanger, the adjacent transverse brackets and longitudinal brackets are welded to reinforce the I-beams to form a rectangular reinforcement frame.

[0014] According to the above scheme, the top ends of the transverse support and the longitudinal support are respectively provided with lifting ears, which are configured with the external crane.

[0015] According to the above solution, a rubber pad is provided between the lower base plate of the U-shaped limiting frame and the lower flange of the I-beam hanger.

[0016] According to the above scheme, there are four distance adjusting trolleys, which are symmetrically installed at the two ends of the horizontal support and the longitudinal support. Two of the distance adjusting trolleys are connected to the top of the pile foundation steel cage to be lifted, and the remaining two distance adjusting trolleys are connected to the bottom of the pile foundation steel cage to be lifted.

[0017] The method for hoisting a pile foundation reinforcement cage using a full-diameter pile foundation reinforcement cage hoisting device is characterized by comprising the following steps:

[0018] Step a, model selection: select the appropriate I-beam according to the diameter and weight of the steel cage, select the hand chain hoist model, adjustable trolley model, wire rope specification, and lug plate thickness according to the weight of the steel cage;

[0019] Step b, making an I-beam hanger: the annular reinforcement ring is reinforced with an I-beam bent into an arc, the rectangular reinforcement frame is reinforced with four I-beams forming a square, and the top ends of the horizontal bracket and the vertical bracket are respectively provided with lifting ears;

[0020] Step c, crane in place and adjustment: The mechanical crane is arranged in a leveled hoisting site, and the crane lifts the I-beam hanger to a height that can be operated by construction workers;

[0021] Step d, assembling the hoist: after adjusting the clearance of the running wheels of the four adjustable trolleys, install them to the lower flange of the I-beam hanger, adjust the spacing of the symmetrical adjustable trolleys, and then use the limit mechanism to fix the trolleys in the left and right directions. Hang the wire rope on the two adjustable trolleys at the bottom of the steel cage, and hang the hand chain hoist on the two adjustable trolleys at the top of the steel cage;

[0022] Step e, reinforcing the steel cage: the horizontal direction of the steel cage hanging point is reinforced with steel bars and the lifting lugs are welded;

[0023] Step f, lifting the steel cage: the crane slowly lifts up, and during the lifting process, the hand chain hoist is adjusted to ensure that the two lifting points on the upper part of the steel cage are also under force during the lifting process until the steel cage stands upright;

[0024] Step g, lower steel cage: the crane swings its arm to lower the steel cage into the hole of the cast-in-place pile, and slowly lowers it to place the first section of the steel cage on the bracket above the hole;

[0025] Step h, repeat the above steps, hoist the second steel cage, connect the two steel cages, and finally put the whole steel cage in place;

[0026] Step i, remove the limiting mechanisms on both sides of the distance adjusting trolley, adjust the distance between the distance adjusting trolleys according to the diameter of the steel cage, fix the two ends of the distance adjusting trolley with the limiting mechanisms, repeat the above steps, and you can realize the lifting of steel cages of different specifications.

[0027] The beneficial effects of the present invention are as follows: a device and method for hoisting steel cages of full-diameter pile foundations are provided, four adjustable-distance trolleys are used as hoisting points, and steel cages of different diameters can be hoisted by adjusting the distance between the trolleys. There is no need to re-customize the hoisting device, and it can be reused, thereby improving construction efficiency and saving construction costs; through four-point hoisting, it is ensured that the hoisting wire rope is parallel to the main bars of the steel cage, avoiding the problem of the steel wire rope and the steel cage being hoisted at a certain angle, thereby causing deformation of the steel cage, and ensuring the quality of the steel cage installation; during the process of erecting the steel cage, a hand winch is used to adjust the stress state of the wire rope, thereby solving the problem of large shaking during the process of the traditional method in which the auxiliary hook of the mechanical crane cooperates with the main hook to erect the steel cage, and improving the safety during the hoisting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic diagram of hoisting a reinforcement cage according to an embodiment of the present invention;

[0030] Figure 2 A top view of an I-beam hanger according to an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the installation of a distance-adjustable trolley according to an embodiment of the present invention;

[0032] Figure 4 A schematic diagram of a limiting mechanism according to an embodiment of the present invention;

[0033] Figure 5 The figure is a schematic diagram of the use of the limiting mechanism according to one embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0037] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0038] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0039] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0041] The features and performance of the present application are further described in detail below in conjunction with the embodiments.

[0042] like Figure 1 , Figure 2 As shown, a device for hoisting a full-diameter pile foundation reinforcement cage includes an I-beam hanger 1, a distance-adjusting trolley 2 and a hoist 3. The I-beam hanger includes a transverse support 4 and a longitudinal support 5 that intersect vertically. The distance-adjusting trolley is respectively mounted on the transverse support and the longitudinal support. The distance-adjusting trolley is connected to the pile foundation reinforcement cage 6 to be hoisted through the hoist.

[0043] Furthermore, an annular reinforcement ring 7 is provided outside the transverse bracket and the longitudinal bracket. The annular reinforcement ring is made of I-beams. The two ends of the transverse bracket and the longitudinal bracket are respectively connected to the inner circumference of the annular reinforcement ring. At the same time, on the I-beam hanger, the adjacent transverse brackets and the longitudinal brackets are welded to reinforce the I-beams to form a rectangular reinforcement frame 8. The annular reinforcement ring and the rectangular reinforcement frame both play a role of reinforcement to ensure the stability of the hoisting process.

[0044] like Figure 3 As shown, the distance-adjusting trolley includes a U-shaped base 9 and running wheels 10. The running wheels are respectively mounted on both sides of the top of the U-shaped base through bearings. The running wheels on both sides are respectively configured to abut against the lower flange of the I-beam hanger and run along the lower flange of the I-beam hanger. A hook 11 is provided at the bottom center of the U-shaped base.

[0045] There are four distance adjusting trolleys, which are symmetrically installed at the two ends of the horizontal support and the longitudinal support. Two of the distance adjusting trolleys are connected to the top of the pile foundation steel cage to be lifted, and the remaining two distance adjusting trolleys are connected to the bottom of the pile foundation steel cage to be lifted.

[0046] The above-mentioned lifting device can be a hand chain hoist, the top of the hand chain hoist is connected to the hook of the traveling wheel, and the bottom of the hand chain hoist is connected to the steel cage of the pile foundation to be lifted.

[0047] By moving the symmetrical distance-adjusting trolley and controlling the hoisting spacing, the hoisting of the full-caliber steel cage can be realized. The steel wire ropes at the four hoisting points are parallel to the main bars of the steel cage, ensuring that the steel cage will not deform during the hoisting process. During the erection of the steel cage, the two lowest steel wire ropes are always under stress. Since the distance between the two uppermost hoisting points and the hoisting is in a state of gradual increase during the erection process, the two upper hoisting points can be adjusted by the hand chain hoist to keep them under stress, thus ensuring that the steel cage is erected stably and safely. At the same time, the hand chain hoist keeps the four-point hoisting force at the same time, which can avoid the crane auxiliary hook from cooperating to erect the steel cage, avoid the shaking of the main hook and the auxiliary hook when the steel cage is hoisted at the same time, and the steel cage can be erected very stably.

[0048] Furthermore, both sides of the traveling wheel are stopped and positioned by a limiting mechanism, which includes a U-shaped limiting frame 12 and a fastening bolt 13. The opening side of the U-shaped limiting frame is arranged toward the lower flange of the I-beam hanger, and the fastening bolt passes through the upper top plate of the U-shaped limiting frame and abuts against the top surface of the lower flange. The lower bottom plate of the U-shaped limiting frame is arranged to fit the bottom surface of the lower flange, and a clamping state is formed with the lower flange by tightening the fastening nut configured with the fastening bolt.

[0049] Lifting ears 14 are respectively provided at both ends of the top of the transverse support and the longitudinal support for configuration with an external crane.

[0050] According to the diameter and weight of the steel cage, choose the appropriate specifications of the I-beam hanger. The I-beam has two functions: one is that the lifting lugs welded on the I-beam serve as lifting poles, and the other is that the I-beam's characteristics can serve as tracks for the adjustable distance trolley. Four lifting lugs are welded on the upper part of the I-beam, and the four-point lifting can ensure the stability of the lifting process. Four adjustable distance trolleys are set at the bottom of the I-beam. By moving the two trolleys symmetrically, the lifting spacing can be determined, thus realizing the lifting of the full-diameter steel cage.

[0051] Furthermore, a rubber pad 15 is provided between the lower bottom plate of the U-shaped limit frame and the lower flange of the I-beam hanger to avoid rigid contact and reduce vibration and prevent wear.

[0052] The method for hoisting a pile foundation reinforcement cage using the hoisting device comprises the following steps:

[0053] 1. Selection: According to the diameter and weight of the steel cage, select the appropriate specifications of I-beam, and according to the weight of the steel cage, select the hand chain hoist model, adjustable trolley model, wire rope specifications, and lug plate thickness.

[0054] 2. Make an I-beam hanger: The annular reinforcement ring is reinforced with an arc-shaped I-beam, and the rectangular reinforcement frame is reinforced with four I-beams in a square shape. Lifting ears are provided at both ends of the top of the horizontal and vertical brackets.

[0055] 3. Adjustment of the crane in place: The mechanical crane is arranged in a leveled lifting site, and the crane lifts the I-beam hanger to a height that the construction workers can operate.

[0056] 4. Assemble the hoist: After adjusting the clearance of the walking wheels of the four adjustable trolleys, install them to the lower flange of the I-beam hanger, adjust the spacing of the symmetrical adjustable trolleys, and then use the limit mechanism to fix the trolleys in the left and right directions. Hang the wire rope on the two adjustable trolleys at the bottom of the steel cage, and hang the hand hoist on the two adjustable trolleys at the top of the steel cage.

[0057] 5. Reinforce the steel cage: Reinforce the horizontal direction of the steel cage hanging point with steel bars and weld the lifting ears.

[0058] 6. Lifting the steel cage: The crane lifts slowly. During the lifting process, keep adjusting the hand winch to ensure that the two lifting points on the upper part of the steel cage are always under force during the lifting process until the steel cage stands upright.

[0059] 7. Lower reinforcement cage: Swing the crane arm to lower the reinforcement cage into the hole of the bored pile. Slowly lower it and place the first section of the reinforcement cage on the bracket above the hole.

[0060] 8. Repeat the above steps to hoist the second section of the steel cage, connect the two sections of the steel cage, and finally put the entire steel cage in place.

[0061] 9. Remove the limiting mechanisms on both sides of the distance adjusting trolley, adjust the distance between the distance adjusting trolleys according to the diameter of the steel cage, fix the two ends of the distance adjusting trolley with the limiting mechanisms, repeat the above steps, and you can realize the lifting of steel cages of different specifications.

[0062] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for hoisting reinforcement cages for full-diameter pile foundations, characterized in that: It includes an I-beam hanger, a distance-adjusting trolley and a sling. The I-beam hanger includes a transverse support and a longitudinal support that intersect vertically. The distance-adjusting trolley is respectively installed on the transverse support and the longitudinal support. The distance-adjusting trolley is connected to the pile foundation steel cage to be lifted through the sling.

2. The device for hoisting a full-diameter pile foundation reinforcement cage according to claim 1, characterized in that: It also includes an annular reinforcement ring, which is made of I-beam, and the two ends of the transverse bracket and the longitudinal bracket are respectively connected to the inner circumference of the annular reinforcement ring.

3. The device for hoisting a full-diameter pile foundation reinforcement cage according to claim 1 or 2, characterized in that: The distance-adjustable trolley includes a U-shaped base and running wheels. The running wheels are respectively installed on both sides of the top of the U-shaped base through bearings. The running wheels on both sides are respectively configured to abut against the lower flange of the I-beam hanger and run along the lower flange of the I-beam hanger. A hook is provided at the bottom center of the U-shaped base.

4. The device for hoisting a full-diameter pile foundation reinforcement cage according to claim 3, characterized in that: The lifting device is a hand chain hoist, the top of the hand chain hoist is connected to the hook of the traveling wheel, and the bottom of the hand chain hoist is connected to the pile foundation reinforcement cage to be lifted.

5. The device for hoisting a full-diameter pile foundation reinforcement cage according to claim 4, characterized in that: The two sides of the walking wheel are stopped and positioned by a limiting mechanism. The limiting mechanism includes a U-shaped limiting frame and a fastening bolt. The opening side of the U-shaped limiting frame is arranged toward the lower flange of the I-beam hanger. The fastening bolt passes through the upper top plate of the U-shaped limiting frame and abuts against the top surface of the lower flange. The lower bottom plate of the U-shaped limiting frame is arranged in contact with the bottom surface of the lower flange. By tightening the fastening nut configured with the fastening bolt, a clamping state is formed with the lower flange.

6. The device for hoisting a full-diameter pile foundation reinforcement cage according to claim 2 or 5, characterized in that: On the I-beam hanger, the adjacent transverse supports and longitudinal supports are welded to reinforce the I-beams to form a rectangular reinforcement frame.

7. The device for hoisting a full-diameter pile foundation reinforcement cage according to claim 5, characterized in that: The top ends of the transverse support and the longitudinal support are respectively provided with lifting ears, which are configured with an external crane.

8. The device for hoisting a full-diameter pile foundation reinforcement cage according to claim 5 or 7, characterized in that: A rubber pad is provided between the lower base plate of the U-shaped limiting frame and the lower flange of the I-beam hanger.

9. The device for hoisting a full-diameter pile foundation reinforcement cage according to claim 7, characterized in that: There are four distance-adjusting trolleys, which are symmetrically installed at the two ends of the horizontal support and the vertical support. Two of the distance-adjusting trolleys are connected to the top of the pile foundation steel cage to be lifted, and the remaining two distance-adjusting trolleys are connected to the bottom of the pile foundation steel cage to be lifted.

10. A method for hoisting a pile foundation reinforcement cage using the full-diameter pile foundation reinforcement cage hoisting device according to claim 9, characterized in that: The steps include: Step a, model selection: select the appropriate specifications of I-beam according to the diameter and weight of the steel cage, select the model of hand chain hoist, model of adjustable trolley, wire rope specifications, and lug plate thickness according to the weight of the steel cage; Step b, making an I-beam hanger: the annular reinforcement ring is reinforced with an arc-shaped I-beam, the rectangular reinforcement frame is reinforced with four I-beams to form a square, and the top ends of the horizontal bracket and the vertical bracket are respectively provided with lifting ears; Step c, crane in place and adjustment: a mechanical crane is placed on a leveled hoisting site, and the crane lifts the I-beam hanger to a height that is accessible to construction workers; Step d, assembling the lifting equipment: After adjusting the clearance between the running wheels of the four adjustable trolleys, install them on the lower flange of the I-beam hanger, adjust the spacing of the symmetrical adjustable trolleys, and then use the limit mechanism to fix the trolleys in both directions. Hang the wire ropes on the two adjustable trolleys that hoist the lower part of the steel cage, and hang the hand hoists on the two adjustable trolleys that hoist the upper part of the steel cage; Step e, reinforcing the steel cage: reinforce the horizontal direction of the steel cage hanging point with steel bars and weld the lifting lugs; Step f, lifting the steel cage: the crane slowly lifts up. During the lifting process, the hand chain hoist is adjusted to ensure that the two lifting points on the upper part of the steel cage are constantly stressed during the lifting process until the steel cage is upright. Step g, lower reinforcement cage: the crane swings its arm to lower the reinforcement cage into the bored pile hole, slowly lowering it to place the first section of the reinforcement cage on the bracket above the hole; Step h, repeat the above steps to hoist the second steel cage, connect the two steel cages, and finally put the whole steel cage in place; Step i: Remove the limiting mechanisms on both sides of the distance adjusting trolley, adjust the distance between the distance adjusting trolleys according to the diameter of the steel cage, fix the two ends of the distance adjusting trolley with the limiting mechanisms, and repeat the above steps to achieve the lifting of steel cages of different specifications.

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