A wire rope hoist for a tower crane

Abstract

The application relates to a hoisting rope tower steel strand traction fixing device and a use method thereof. A hoisting assembly is installed on the top of a hoisting rope tower, a traction steel strand is connected with the hoisting assembly and a second connecting cylinder, then the end is passed through an anchorage steel strand through hole and is lowered to a target position at the bottom of the tower; the connecting end of the traction steel strand is arranged at the target position and a first connecting cylinder is installed; then the first connecting cylinder and the second connecting cylinder are connected through a connecting piece; the hoisting assembly is started, and the traction steel strand is pulled to the top of the hoisting rope tower. The above device and construction steps enable detachable connection between the traction steel strand and the pulled steel strand, the traction steel strand and the pulled steel strand can pass through the through hole, the pulled steel strand is quickly and accurately pulled through the anchor plate under the traction of the traction steel strand under the action of the hoisting machine and is not affected by high-altitude wind force; the installation efficiency of the traction steel strand is improved, the traction steel strand is not affected by the lifting height or the operation space of the self-propelled crane, and the construction is facilitated.

Description

Technical Field

[0001] This application relates to the field of bridge construction technology, and in particular to a steel strand traction and fixing device for suspension towers and its usage method. Background Technology

[0002] With the continuous development of urbanization, the construction of large bridges is increasing. During bridge rotation or jacking construction, the cantilever beam end may deflect excessively, exceeding the safety limits of existing structures or buildings, thus affecting construction. Therefore, measures need to be taken during construction to control the deflection height at the beam end. For steel structure bridges, a common method is to install a cable-stayed tower away from the cantilever end, pull steel strands from the top of the cable-stayed tower, and then connect them to the sling device on the cable-stayed tower to hold the cantilever end in place, thereby reducing the deflection height at the cantilever end.

[0003] When the span of a cantilever beam is large or the height of a cable-stayed tower is high, the installation of the traction steel strands often requires first hoisting them using a tower crane or similar device, then temporarily fixing them by threading the strands through the sling tower and at the cantilever end, and finally tensioning them to the design force value. The specific steps are as follows:

[0004] One end of the steel strand to be pulled is lifted from bottom to top using a tower crane and pulled to the anchor plate of the cable tower. The anchor plate is then inserted and temporarily fixed. Finally, the other end of the steel strand to be pulled is temporarily fixed to the cantilever end during construction.

[0005] During the above construction process, the traction of the steel strands from bottom to top is greatly affected by the high-altitude environment, making it difficult to align the threading holes of the anchor plates, which increases the installation difficulty and reduces work efficiency. In addition, for many bridge construction projects without tower cranes, this construction method uses self-propelled cranes for lifting, which has the disadvantages of insufficient lifting height or limited working space. Summary of the Invention

[0006] This application provides a steel strand traction and fixing device for cable-stayed towers and its usage method, to solve the problems in related technologies, such as the difficulty in operation due to insufficient lifting height or limited working space when using bottom-up traction of the steel strand in bridge construction projects without tower cranes, and the significant impact of the high-altitude environment on bottom-up traction of the steel strand when using tower cranes to traction the steel strand in cantilever beams with large spans or cable-stayed towers with high heights, which increases the difficulty of installation and reduces work efficiency.

[0007] In a first aspect, a steel strand traction and fixing device for a suspension tower is provided, comprising:

[0008] The first connecting cylinder is used to connect the pulled steel strand;

[0009] The second connecting cylinder is used to connect the traction steel strand;

[0010] A connector that coaxially and detachably connects the first connecting cylinder and the second connecting cylinder; the diameters of the first connecting cylinder, the second connecting cylinder, and the connector are all smaller than the diameter of the anchor steel strand threading hole;

[0011] A winch assembly is used to connect to the end of the traction steel strand away from the second connecting cylinder; the winch assembly is used to be installed on the top of the sling tower.

[0012] In some embodiments, the connector includes a tapered clamping structure and a connecting sleeve, one end of which is fixedly connected to the second connecting cylinder, and the other end is provided with a tapered threaded connecting groove; the tapered clamping structure is threadedly connected in the tapered threaded connecting groove, and the tapered clamping structure is connected to the first connecting cylinder.

[0013] In some embodiments, the first connecting cylinder is provided with a channel for accommodating the pulled steel strand, and a limiting ring is provided at one end of the first connecting cylinder that is connected to the connector.

[0014] The conical clamping structure includes multiple conical blocks, which are arranged in a circle with the center of the limiting ring as the center; the multiple conical blocks enclose a clamping space for clamping the central straight strand of the pulled steel strand, and the channel is connected to the clamping space;

[0015] The larger end of the conical block is provided with a stop block, and this end passes through the limiting ring; the outer diameter of the retaining ring formed by the multiple stop blocks is larger than the inner diameter of the limiting ring, and the outer diameter of the retaining ring formed by the multiple stop blocks is smaller than the inner diameter of the first connecting cylinder.

[0016] When the connecting sleeve and the tapered clamping structure are connected, the clamping space is reduced to fix the central straight steel wire.

[0017] In some embodiments, one side of the conical block located in the clamping space is an arc-shaped surface, and an arc-shaped fastening protrusion is provided on the arc-shaped surface.

[0018] In some embodiments, there are multiple arc-shaped fastening protrusions, which are evenly spaced along the length of the first connecting cylinder.

[0019] In some embodiments, an arc-shaped rubber strip is provided between two adjacent arc-shaped fastening protrusions.

[0020] In some embodiments, the outer periphery of the cross-section of the connecting sleeve is hexagonal.

[0021] In some embodiments, the second connecting cylinder has an installation space and a riveting hole is provided on its outer surface; a rivet is provided in the riveting hole;

[0022] When the traction steel strand is fixed in the installation space, one end of the rivet extends radially into the installation space along the second connecting cylinder and abuts against the traction steel strand, while the other end is located in the rivet hole.

[0023] Secondly, a method for using a steel strand traction and fixing device for a suspension tower is provided, comprising:

[0024] Install the winch assembly on the top of the cable-stayed tower;

[0025] The operation for pulling a single strand of steel wire is as follows:

[0026] Connect one end of the traction steel strand to the winding part of the winch assembly; connect the other end to the second connecting cylinder, and then pass the end through the anchor steel strand through the bundle hole and lower it to the target position at the bottom of the tower.

[0027] The connecting end of the steel strand to be pulled is set at the target position, and the first connecting cylinder is installed; then the first connecting cylinder and the second connecting cylinder are connected using a connector.

[0028] Start the hoisting assembly to pull the traction steel strand to the top of the suspension tower.

[0029] In some embodiments, after a single traction steel strand passes through the anchor steel strand threading hole, it is temporarily fixed using a clamp.

[0030] After the temporary fixing operation is completed, the steel strand traction fixing device for the sling tower is disconnected from the single traction steel strand and moved to the set position; then the installation of the next traction steel strand is carried out.

[0031] The beneficial effects of the technical solution provided in this application include:

[0032] This application provides a steel strand traction and fixing device for a cable-stayed tower and its usage method. During use, a winch assembly is installed on the top of the cable-stayed tower. One end of the traction steel strand is connected to the winch assembly; the other end is connected to a second connecting cylinder. This end then passes through the anchor steel strand's threading hole and is lowered to the target position at the bottom of the tower. The connecting end of the traction steel strand is placed at the target position, and a first connecting cylinder is installed. Then, the first and second connecting cylinders are connected using connectors. The winch assembly is activated to pull the traction steel strand to the top of the cable-stayed tower. Through the above device and construction steps, the traction steel strand and the traction steel strand are detachably connected, facilitating their connection on the ground. Simultaneously, the entire device connecting the traction steel strand and the traction steel strand can pass through the threading hole, allowing the traction steel strand to quickly and accurately pass through the anchor plate under the traction of the winch, unaffected by high-altitude winds. Therefore, the installation efficiency of the traction steel strand is improved, and a crane is not required for lifting. It is not affected by the lifting height or working space of a self-propelled crane, has a simple structure, and is easy to construct. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A schematic diagram illustrating the connection state between the connector and the first connecting cylinder and the second connecting cylinder provided in the embodiments of this application;

[0035] Figure 2 A schematic diagram showing the connection between the pulled steel strand and the first connecting cylinder and the conical clamping structure provided in an embodiment of this application;

[0036] Figure 3 This is a schematic diagram showing the connection between the traction steel strand and the first connecting cylinder and connecting sleeve provided in an embodiment of this application.

[0037] In the diagram: 1. First connecting cylinder; 2. Traction steel strand; 3. Second connecting cylinder; 4. Traction steel strand; 5. Connecting piece; 500. Conical clamping structure; 501. Connecting sleeve; 6. Central straight steel wire. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] This application provides a steel strand traction and fixing device for cable-stayed towers and its usage method, to solve the problems in related technologies, such as the difficulty in operation due to insufficient lifting height or limited working space when using bottom-up traction of the steel strand in bridge construction projects without tower cranes, and the significant impact of the high-altitude environment on bottom-up traction of the steel strand when using tower cranes to traction the steel strand in cantilever beams with large spans or cable-stayed towers with high heights, which increases the difficulty of installation and reduces work efficiency.

[0040] Please see Figures 1-3 A steel strand traction and fixing device for a suspension tower, comprising:

[0041] The first connecting cylinder 1 is used to connect the pulled steel strand 2;

[0042] The second connecting cylinder 3 is used to connect the traction steel strand 4;

[0043] The connector 5 detachably connects the first connecting cylinder 1 and the second connecting cylinder 3 coaxially; the diameters of the first connecting cylinder 1, the second connecting cylinder 3 and the connector 5 are all smaller than the diameter of the anchor steel strand through hole;

[0044] A winch assembly is used to connect to the end of the traction steel strand 4 away from the second connecting cylinder 3; the winch assembly is used to be installed on the top of the sling tower.

[0045] During operation, the winch assembly is installed on the top of the cable-stayed tower. One end of the traction steel strand 4 is connected to the winch assembly; the other end is connected to the second connecting cylinder 3. This end then passes through the anchor steel strand threading hole and is lowered to the target position at the bottom of the tower. The connecting end of the traction steel strand 2 is set at the target position, and the first connecting cylinder 1 is installed. Then, the first connecting cylinder 1 and the second connecting cylinder 3 are connected using the connector 5. The winch assembly is started to pull the traction steel strand 2 to the top of the cable-stayed tower. Through the above device and construction steps, the traction steel strand 2 and the anchor steel strand 4 are connected to the anchor steel strand 2. The traction steel strands 4 are detachably connected, facilitating their connection on the ground. The entire device connecting the pulled steel strand 2 and the traction steel strand 4 can pass through the threading hole from the ground, allowing the pulled steel strand 2 to quickly and accurately pass through the anchor plate under the traction of the traction steel strand 4, unaffected by high-altitude winds. Therefore, the installation efficiency of the pulled steel strand 2 is improved, and no crane is required for lifting. It is unaffected by the lifting height or working space of a self-propelled crane, has a simple structure, low mechanical configuration requirements, and is easy to construct.

[0046] In some preferred embodiments, the structure of the connector 5 is described in detail:

[0047] The connector 5 includes a conical clamping structure 500 and a connecting sleeve 501. One end of the connecting sleeve 501 is fixedly connected to the second connecting cylinder 3, and the other end is provided with a conical threaded connecting groove. The conical clamping structure 500 is threadedly connected in the conical threaded connecting groove, and the conical clamping structure 500 is connected to the first connecting cylinder 1.

[0048] This structure allows for detachable connections. In this case, the first connecting cylinder 1 is fixedly connected to the pulled steel strand 2; the second connecting cylinder 3 is fixedly connected to the pulling steel strand 4. While a compression connection can be used for the fixed connection, this makes disassembly inconvenient. Therefore, the following improvements are made:

[0049] The first connecting cylinder 1 has a channel for accommodating the pulled steel strand 2. The diameter of the first connecting cylinder 1 is larger than the diameter of the channel, with a difference of 1 mm. A limiting ring is provided at one end of the first connecting cylinder 1 that is connected to the connecting piece 5. The diameters of the first connecting cylinder 1 and the second connecting cylinder 3 are smaller than the anchor steel strand through hole, with a difference of 1 mm.

[0050] The conical clamping structure 500 includes multiple conical blocks, which are arranged in a circle with the center of the limiting ring as the center; the multiple conical blocks enclose a clamping space for clamping the central straight steel wire 6 of the pulled steel strand 2, and the channel is connected to the clamping space;

[0051] The larger end of the conical block is provided with a stop block, and this end passes through the limiting ring; the outer diameter of the retaining ring formed by multiple stops is larger than the inner diameter of the limiting ring, and the outer diameter of the retaining ring formed by multiple stops is smaller than the inner diameter of the first connecting cylinder 1.

[0052] When the connecting sleeve 501 and the conical clamping structure 500 are connected, the connecting sleeve 501 gradually brings the multiple conical blocks closer together, reducing the clamping space to fix the central straight steel wire 6.

[0053] With the above structural design, the traction steel strand 2 inside the first connecting cylinder 1 can be separated from or firmly connected to the connecting piece 5, which facilitates the traction of the next traction steel strand 2.

[0054] Furthermore, to strengthen the connection with the central straight steel wire 6, one side of the conical block located in the clamping space is an arc-shaped surface, and this arc-shaped surface is provided with arc-shaped fastening protrusions; there are multiple arc-shaped fastening protrusions, which are evenly spaced along the length direction of the first connecting cylinder 1. An arc-shaped rubber strip is provided between two adjacent arc-shaped fastening protrusions. The setting of the arc-shaped rubber strip increases the friction and reduces damage to the central straight steel wire 6.

[0055] Furthermore, since the connecting sleeve 501 needs to be rotated when connecting the connecting sleeve 501 and the conical clamping structure 500, the outer periphery of the cross-section of the connecting sleeve 501 is hexagonal to facilitate rotation using a wrench.

[0056] In some preferred embodiments, in order to connect the second connecting cylinder 3 to the traction steel strand 4 and facilitate passage through the threading hole, the second connecting cylinder 3 has an installation space and a riveting hole on its outer surface; a rivet is provided in the riveting hole; when the traction steel strand 4 is fixed in the installation space, one end of the rivet extends radially into the installation space along the second connecting cylinder 3 and abuts against the traction steel strand 4, while the other end is located in the riveting hole.

[0057] Of course, compression fitting or interference fit fitting can also be used.

[0058] Based on the above explanation, the traction steel strand 4 on the winch assembly uses the above structure for fixed connection. Since frequent disassembly is not required in actual use, this structure is unnecessary. Furthermore, the traction steel strand 4 on the winch assembly needs to be connected to different traction steel strands 2, requiring frequent disassembly. Therefore, a structure that allows for quick disassembly is needed, namely the aforementioned conical clamping structure 500 and the first connecting cylinder 1. This further accelerates the connection process during construction and speeds up the construction progress.

[0059] This application also proposes a method for using a steel strand traction and fixing device for a suspension tower, which includes the following steps:

[0060] Install the winch assembly on the top of the cable-stayed tower;

[0061] The operation for pulling a single pulled steel strand 2 is as follows:

[0062] One end of the traction steel strand 4 is connected to the winding part of the winch assembly; the other end is connected to the second connecting cylinder 3, and then the end is passed through the anchor steel strand through hole and lowered to the target position at the bottom of the tower.

[0063] The connecting end of the steel strand 2 to be pulled is set at the target position, and the first connecting cylinder 1 is installed; then the first connecting cylinder 1 and the second connecting cylinder 3 are connected by the connector 5.

[0064] Start the winch assembly to pull the steel strand 2 to the top of the cable tower.

[0065] Furthermore, after the single pulled steel strand 2 passes through the anchor steel strand threading hole, it is temporarily fixed using a clamp.

[0066] After the temporary fixing operation is completed, the steel strand traction fixing device for the sling tower is disconnected from the single traction steel strand 2 and moved to the set position; then the installation of the next traction steel strand 2 is carried out.

[0067] The above construction steps can be referred to in the following instructions:

[0068] P1. Wrap one end of the traction steel strand 4 around the winding part of the traction winch assembly. The winch assembly is placed on the working platform behind the anchor at the top of the cable tower.

[0069] P2. Connect the other end of the traction steel strand 4 to the second connecting cylinder 3, then pass the end through the anchor steel strand threading hole and lower it to the target position at the bottom of the tower; the target position is the position at the bottom of the tower where the traction steel strand 2 needs to be pulled.

[0070] P3. Cut the end of the steel strand 2 to be pulled flat, strip the outer winding steel wire, leaving the central straight steel wire 6, and the stripping length is slightly less than the length of the cone block.

[0071] P4. Pass the pulled steel strand 2 through the channel of the first connecting cylinder 1, and then insert the central straight steel wire 6 into the clamping space of the multiple conical blocks of the conical clamping structure 500.

[0072] P5. Connect the portion of the traction steel strand 4 located at the bottom of the tower to the second connecting cylinder 3. Then, bring the connecting sleeve 501 on the second connecting cylinder 3 into contact with the conical clamping structure 500. Then, rotate the conical clamping structure 500 to tighten multiple conical blocks to reduce the clamping space. Then, clamp the central straight steel wire 6.

[0073] P6. Check the stability of the steel strand structure, start the hoisting assembly at the top of the suspender tower, so that the pulled steel strand 2 can pass through the anchor plate quickly and accurately under the traction of the pulling steel strand 4.

[0074] P7. After the pulled steel strand 2 passes through the tower top anchor, use clamps to temporarily fix the pulled steel strand 2, then disconnect it from the pulling steel strand 4, and then move the winch assembly to the set position.

[0075] P8. Begin the traction of the next strand of steel cable.

[0076] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0077] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0078] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A suspension tower steel strand pulling fixture characterized by, It comprises: The first connecting barrel (1) is used for connecting the pulled steel strand (2); The second connecting barrel (3) is used for connecting the pulling steel strand (4); The connecting piece (5) coaxially connects the first connecting barrel (1) and the second connecting barrel (3); The diameters of the first connecting barrel (1), the second connecting barrel (3) and the connecting piece (5) are all smaller than the diameter of the anchorage steel strand through hole; The connecting piece (5) comprises a tapered clamping structure (500) and a connecting sleeve (501), one end of the connecting sleeve (501) is fixedly connected with the second connecting barrel (3), and the other end is provided with a tapered threaded connecting groove; The tapered clamping structure (500) is threadedly connected in the tapered threaded connecting groove, the tapered clamping structure (500) is connected with the first connecting barrel (1); The first connecting barrel (1) is provided with a channel for accommodating the pulled steel strand (2), and the end of the first connecting barrel (1) connected with the connecting piece (5) is provided with a limiting ring; The tapered clamping structure (500) comprises a plurality of tapered blocks, and the plurality of tapered blocks are circularly distributed with the center of the limiting ring as the center; The plurality of tapered blocks enclose a clamping space for clamping the central straight wire (6) of the pulled steel strand (2), and the channel is communicated with the clamping space; The larger end of the two ends of the tapered block is provided with a stop block, and the end is arranged to pass out of the limiting ring; The outer diameter of the stop ring enclosed by the plurality of stop blocks is greater than the inner diameter of the limiting ring, and the outer diameter of the stop ring enclosed by the plurality of stop blocks is smaller than the inner diameter of the first connecting barrel (1); When the connecting sleeve (501) and the tapered clamping structure (500) are connected, the clamping space is reduced to fix the central straight wire (6); The second connecting barrel (3) has a mounting space, and a riveting hole is arranged on the outer surface thereof; A rivet is arranged in the riveting hole; When the pulling steel strand (4) is fixed in the mounting space, one end of the rivet extends into the mounting space along the radial direction of the second connecting barrel (3) and abuts against the pulling steel strand (4), and the other end is located in the riveting hole; The winch assembly is used for connecting with the end of the pulling steel strand (4) away from the second connecting barrel (3); The winch assembly is used for being installed on the top of the tower of the tower crane.

2. The steel strand pulling fixing device for the tower crane as claimed in claim 1, wherein: The side surface of the tapered block in the clamping space is an arc surface, and the arc surface is provided with an arc fastening protrusion.

3. The steel strand pulling fixing device for the tower crane as claimed in claim 2, wherein: The number of the arc fastening protrusions is multiple, and the arc fastening protrusions are uniformly and interval distributed along the length direction of the first connecting barrel (1).

4. The steel strand pulling fixing device for the tower crane as claimed in claim 3, wherein: An arc rubber strip is arranged between the adjacent two arc fastening protrusions.

5. The steel strand pulling fixing device for the tower crane as claimed in claim 1, wherein: The outer peripheral shape of the cross section of the connecting sleeve (501) is hexagonal.

6. A method for using the steel strand pulling fixing device for the tower crane as claimed in any one of claims 1-5, wherein: The winch assembly is installed on the top of the tower of the tower crane. The operation of pulling a single pulled steel strand (2) is as follows: One end of the pulled steel strand (4) is connected with the winding part of the winch assembly; the other end is connected with the second connecting barrel (3), and then the end passes through the anchor steel strand threading hole and is lowered to the target position at the bottom of the tower; The connecting end of the pulled steel strand (2) is arranged at the target position, and the first connecting barrel (1) is installed; then the first connecting barrel (1) and the second connecting barrel (3) are connected by the connecting piece (5); Start the winch assembly to pull the pulled steel strand (2) to the top of the sling tower.

7. The method for using the steel strand pulling fixing device for a sling tower according to claim 6, characterized in that: After the single pulled steel strand (2) passes through the anchor steel strand threading hole, temporary fixing is performed by using a clamp; After the temporary fixing operation is completed, the steel strand pulling fixing device for a sling tower is disconnected from the single pulled steel strand (2) and is moved to a set position; then the installation of the next pulled steel strand (2) is performed.

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