Cable body lifting device and lifting method for steel strand cable construction

Abstract

The present invention relates to a cable body lifting device and lifting method for steel strand cable construction, belonging to the technical field of bridge construction. It comprises a snap-on hanger, the snap-on hanger is vertically arranged at the pipe mouth of the cable guide tube, the top of the snap-on hanger is connected to the anchor plate through a fixed rope; a lifting device is hung on the snap-on hanger, a cable body is provided below the lifting device, a lifting rope is tied around the cable body and both ends of the lifting rope are hung on the lifting device; the lifting device drives the lifting rope to move up and down, driving the cable body to move up and down synchronously. The snap-on hanger comprises two oppositely arranged columns, the tops of the two columns are fixedly connected by a cross brace, the bottom ends of the columns are respectively provided with clamping plates, the clamping plates are respectively provided with clamping slots, the clamping slots are clamped to the pipe mouth of the cable guide tube; the cross brace is provided with a threading hole. The structure of the present application is compact, suitable for different construction conditions, easy to install, can provide lifting tension in different directions, and has reasonable force.

Description

Technical Field

[0001] The invention relates to a cable body lifting device and a lifting method for steel strand cable construction, belonging to the technical field of bridge construction. Background Art

[0002] Strand cables are typically installed in two ways: one is to assemble the components after they are shipped to the site, and the other is to assemble them at the manufacturer before shipping them to the site. For projects requiring on-site assembly, during the initial tensioning phase, due to the low cable tension, the first few strands must bear both their own weight and the weight of the HDPE outer casing. This is especially true for large strands, which are not only long but also have a small angle with the beam surface, resulting in significant sag. Strand threading is typically performed from the top row to the bottom row, primarily to prevent strand tangling during threading. Therefore, if the cable sag is significant, the cable and the center of the cable guide at the beam end will not be aligned. The already threaded strands may sag to the bottom edge of the cable guide, leaving no room for threading the next row of strands. This necessitates the use of auxiliary tools to lift and hoist the already threaded strands to make room for threading the next few rows of strands. In addition, due to construction errors, the cable body may still be eccentric in different directions with the cable guide tube after tensioning, making it difficult to install the shock absorber and requiring the cable body to be pulled to correct the deviation.

[0003] like Figure 1 As shown, the portal column hangers used in the past have the following problems: 1) large size and inconvenient transportation; 2) for construction conditions such as the front-point hanging basket, the bridge deck is poured after the cables are initially stretched, and there is no platform to place the portal column hanger at this time; 3) the height of each cable guide tube is different, and the portal column hanger must be higher than the height of the highest cable guide tube. Only in this way can it achieve universality; 4) the lifting force effect is not good. The portal column hanger is placed on the beam surface, and the force direction is perpendicular to the beam surface. In fact, each cable has a different angle with the beam surface, which means that the tension provided by the portal column hanger during lifting is not perpendicular to the cable body, and the cable body only bears part of the tension; 5) when the cable body and the cable guide tube deviate in different directions, because the portal column hanger can only provide a tension in the direction perpendicular to the beam surface, it cannot correct the eccentricity in other directions. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a cable lifting device and lifting method for steel strand cable construction in response to the above-mentioned existing technology. The device has a compact structure, is suitable for different construction conditions, is easy to install, can provide lifting tension in different directions, has reasonable force, and can also play a certain auxiliary role in the installation of auxiliary components.

[0005] The technical solution adopted by the present invention to solve the above-mentioned problems is: a cable lifting device for steel strand cable construction, including a snap-on hanger, which is vertically arranged at the pipe mouth of the cable guide tube, and the top of the snap-on hanger is connected to the anchor plate through a fixed rope; a lifting device is hung on the snap-on hanger, and a cable body is provided under the lifting equipment, and a lifting rope is tied around the cable body and both ends of the lifting rope are hung on the lifting equipment; the lifting equipment drives the lifting rope to rise and fall, driving the cable body to rise and fall synchronously.

[0006] The snap-on hanger includes two oppositely arranged columns, the tops of the two columns are fixedly connected by a cross brace, and clamping plates are respectively provided at the bottom ends of the columns. The clamping plates are respectively provided with clamping slots, and the clamping slots are clamped on the pipe openings of the rope guide tube; a wire threading hole is provided on the cross brace, one end of the fixing rope is tied to the wire threading hole, and the other end is tied to the anchor plate.

[0007] A reinforcing strut is also provided, and the reinforcing strut is fixed between the two columns.

[0008] The cross braces and columns are respectively made of section steel, and the reinforcing braces are made of rectangular steel plates or round steel.

[0009] A lifting lug is provided at the bottom of the cross brace, and the lifting equipment is hung on the lifting lug.

[0010] The lifting equipment is a hand hoist or an electric hoist.

[0011] A method for lifting a cable body lifting device for steel strand cable construction, the method comprising the following steps:

[0012] Step 1: Install the clip-on hanger on the cable guide pipe opening;

[0013] Step 2: Pass one end of the fixing rope through the connection hole and fix it, and fix the other end of the fixing rope on the anchor plate;

[0014] Step 3: Hang the hook at one end of the lifting equipment on the lifting lug;

[0015] Step 4: Wrap the rope around the cable body and hang both ends of the rope on the hook at the other end of the lifting equipment;

[0016] Step 5: Start the lifting equipment, lift the lifting rope, and lift the rope body in the required direction;

[0017] Step 6: After the cable body is lifted, space is made between the cable body and the lower edge of the cable guide tube so that the cable threading construction of the steel strands below can continue until the cable threading construction of all the steel strands is completed.

[0018] The snap-on hanger is installed according to the direction in which the cable body needs to be lifted.

[0019] Compared with the prior art, the advantages of the present invention are: a cable hoisting device and method for steel strand cable construction, simple in structure, compact in size, and easy to install; the hoisting device is installed at the cable guide tube mouth and is perpendicular to the cable guide tube, and the cable guide tube and the cable body are in a straight line, eliminating the need for a construction platform and being unaffected by construction conditions; the device also provides more reasonable force distribution and better lifting effect. The present invention is not limited to lifting in a single direction and can be installed at any position around the cable guide tube. Regardless of the direction in which the cable body deviates, deviation correction can be achieved, which can assist in the installation of shock absorbers for auxiliary components.

[0020] This lifting device is also applicable to parallel steel wire rope projects. It is an auxiliary measure taken to correct the deviation of the rope body and rope guide tube when facilitating the installation of the shock absorber of the auxiliary component.

[0021] This technology is not limited to projects where the anchoring area is an anchor plate structure, but is also applicable to projects where the anchoring area is a steel anchor box structure, a concrete beam cable duct structure or a steel box beam cable duct. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the existing technology door column hanger

[0023] Figure 2 This is a schematic diagram of a cable body lifting device for steel strand cable construction according to an embodiment of the present invention;

[0024] Figure 3 for Figure 2 Schematic diagram of the middle clip-on hanger;

[0025] Figure 4 for Figure 3 Left view of the middle pallet and column;

[0026] Figure 5 for Figure 3 Right side view of the middle pallet and column;

[0027] In the figure, 1 is an HDPE outer sleeve, 2 is a cable body, 21 is a steel strand, 3 is a lifting device, 31 is a fixed rope, 32 is a clip-on hanger, 321 is a cross brace, 322 is a column, 323 is a reinforcing brace, 324 is a clamping plate, 325 is a lifting lug, 326 is a threading hole, 33 is an electric hoist, 34 is a lifting rope, 4 is an anchor plate, 5 is an anchor pull plate, and 51 is a cable guide. DETAILED DESCRIPTION

[0028] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0029] like Figure 2As shown in the figure, a cable hoisting device for steel strand cable construction in this embodiment comprises a cable guide tube 51, within which a cable body 2 is passed. An HDPE outer sleeve 1 is sleeved over the cable body 2, and an anchor plate 4 is inserted at one end of the cable body 2. The hoisting device 3 comprises a snap-on hanger 32, which is vertically fixed to the opening of the cable guide tube 51. The top of the snap-on hanger 32 is connected to the anchor plate 5 via a fixed rope 31, securing the snap-on hanger 32 to the cable guide tube 51. A lifting lug 325 is provided below the top of the snap-on hanger 32. The hook at the top of an electric hoist 33 is attached to the lifting lug 325. The cable body 2 is secured with a lifting rope 34, and the ends of the lifting rope 34 are attached to the hooks at the bottom of the electric hoist 33. Activating the electric hoist 33 drives the lifting rope to move upward and downward, causing the cable body to rise and fall synchronously, allowing the cable body to move in the desired direction.

[0030] like Figure 3 、 4 As shown in Figures 5 and 6, the clip-on hanger 32 comprises two opposing columns 322. The tops of the columns 322 are fixedly connected by a cross brace 321, and the bottoms of the columns 322 are fixedly connected by a reinforcing brace 323, forming a rectangular frame. A clamping plate 324 is provided at the bottom of each column 322. Each clamping plate 324 has a slot that engages the opening of the cable guide 51. The cross brace 321 has a threading hole 326, through which one end of the fixing rope is tied, and the other end of the fixing rope is tied to the anchor plate.

[0031] The cross braces and columns are made of section steel, preferably angle steel or channel steel for the cross braces and I-beam or channel steel for the columns. The reinforcing braces are made of rectangular steel plates or round steel.

[0032] Electric hoists can also be hand hoists.

[0033] A method for lifting a cable body lifting device for steel strand cable construction, comprising the following steps:

[0034] Step 1: The clip-on hanger is clipped onto the pipe opening of the cable guide tube. The clip-on hanger is installed according to the direction in which the cable body needs to be lifted.

[0035] Step 2: Pass one end of the fixing rope through the threading hole and fix it, and fix the other end of the fixing rope to the anchor plate or the bottom of the rope guide tube.

[0036] Step 3: Install the electric hoist and hang the hook on the top of the electric hoist on the lifting lug.

[0037] Step 4: Wrap the rope around the cable body and hang both ends of the rope on the hooks at the bottom of the electric hoist.

[0038] Step 5: Start the electric hoist, tighten and lift the rope to lift the rope in the required direction.

[0039] Step 6: After the cable body is lifted, space is made between the cable body and the lower edge of the cable guide tube, so that the cable threading construction of the lower steel strands 21 can continue until the cable threading construction of all steel strands is completed.

[0040] This application features a simple structure, compact size, and easy installation. The lifting device is installed at the conduit opening and perpendicular to the conduit, with the conduit and the theoretical center of the cable body aligned, eliminating the need for a construction platform and unaffected by construction conditions. Furthermore, the device provides a more balanced force distribution and improved lifting performance. This application is not limited to lifting in a single direction and can be installed anywhere around the conduit. Regardless of the cable body's deviation, it can be corrected, facilitating the installation of shock absorbers for auxiliary components.

[0041] The lifting device 3 is also applicable to parallel steel wire cable projects, and is an auxiliary measure taken to correct the deviation of the cable body and the cable guide tube when facilitating the installation of the auxiliary component shock absorber.

[0042] This technology is not limited to projects where the anchorage area is an anchor plate structure, but is also applicable to projects where the anchorage area is a steel anchor box structure, a concrete beam cable duct structure or a steel box beam cable duct.

[0043] In addition to the above embodiments, the present invention also includes other implementation methods. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of protection of the claims of the present invention.

Claims

1. A cable hoisting device for steel strand cable construction, characterized by: The lifting device is installed at the pipe opening of the cable guide tube and is in a vertical state with the cable guide tube. The lifting device includes a snap-on hanger, which is vertically arranged at the pipe opening of the cable guide tube. The top of the snap-on hanger is connected to the anchor plate through a fixed rope. A lifting device is hung on the snap-on hanger, and a cable body is provided below the lifting device. The cable body is tied with a lifting rope and the two ends of the lifting rope are hung on the lifting device. The lifting device drives the lifting rope to move up and down, thereby driving the cable body to move up and down synchronously. The clip-on hanger comprises two oppositely arranged upright posts, the tops of the two upright posts being fixedly connected by a cross brace, the bottom ends of the upright posts being provided with a clamping plate, each of the clamping plates being provided with a clamping slot, the clamping slot being clamped to the orifice of the cable guide tube; the cross brace being provided with a threading hole, one end of the fixing rope being tied to the threading hole, and the other end being tied to the anchor plate; A lifting lug is provided at the bottom of the cross brace, and the lifting equipment is hung on the lifting lug.

2. A cable hoisting device for steel strand cable construction according to claim 1, characterized in that: A reinforcing strut is also provided, and the reinforcing strut is fixed between the two columns.

3. A cable hoisting device for steel strand cable construction according to claim 2, characterized in that: The cross braces and columns are respectively made of section steel, and the reinforcing braces are made of rectangular steel plates or round steel.

4. The cable hoisting device for steel strand cable construction according to claim 1, characterized in that: The lifting equipment is a hand hoist or an electric hoist.

5. A method for lifting a cable body lifting device for steel strand cable construction according to any one of claims 1 to 4, characterized in that: The lifting method comprises the following steps: Step 1: Install the clip-on hanger on the cable guide pipe opening; Step 2: Pass one end of the fixing rope through the connection hole and fix it, and fix the other end of the fixing rope on the anchor plate; Step 3: Hang the hook at one end of the lifting equipment on the lifting lug; Step 4: Wrap the rope around the cable body and hang both ends of the rope on the hook at the other end of the lifting equipment; Step 5: Start the lifting equipment, lift the lifting rope, and lift the rope body in the required direction; Step 6: After the cable body is lifted, space is made between the cable body and the lower edge of the cable guide tube so that the cable threading construction of the steel strands below can continue until the cable threading construction of all the steel strands is completed.

6. The method for lifting a cable body lifting device for steel strand cable construction according to claim 5, characterized in that: The snap-on hanger is installed according to the direction in which the cable body needs to be lifted.

Images