CN205501830U - Cable support tower construction removable support - Google Patents

Abstract

The utility model relates to a mobile support for cable tower construction. The system includes a steel pipe, a climbing frame, a lifting frame, a hoop, a chain hoist and a safety wire rope, wherein four steel pipes are provided and are respectively fixed around the cable tower, and It can be extended vertically and used as a guide rail for fixing and climbing the climbing frame and lifting frame. The climbing frame has three layers and is fixed on four steel pipes, and each layer of climbing frame is arranged along the circumference of the cable tower to surround the cable tower. , the lifting frame is fixed on four steel pipes, arranged along the circumference of the cable tower, surrounding the cable tower, and located above the uppermost climbing frame, and the hoop is set on the steel pipe to support the climbing frame or lifting frame. The chain hoist is connected between two adjacent climbing frames, or between the climbing frame and the lifting frame, and the safety wire rope is connected between two adjacent layers of climbing frames, or between the climbing frame and the lifting frame. Compared with the prior art, the auxiliary support system of the utility model can simplify the construction process and reduce the construction risk.

Description

Cable tower construction mobile support

technical field

The utility model belongs to the field of bridge construction, in particular to a mobile support for cable tower construction.

Background technique

At present, the overturning process and the climbing formwork process are often used in the construction of cable towers in China. Among them, the overturning construction is that the formwork of the top section of the cable tower in the above section is used as the fixed section and the load-bearing part, and the formwork removed from the upper section is installed for construction, and scaffolding needs to be erected as a construction platform; the climbing formwork is composed of climbing formwork, climbing frames, and Climbing equipment is composed of pre-embedded track shear members in the poured section, hydraulic jacking construction section by section along the track, and hanging scaffolding on the self-climbing formwork can save the external scaffolding in the construction process.

At present, the commonly used auxiliary supports for cable tower construction in China include scaffolding and climbing formwork supports. Scaffolding is built layer by layer using steel pipes, scaffolding boards, etc. Due to the limitation of the erection height, if it is used for a high tower, it needs to be erected and dismantled in sections using a conversion platform. There are many control factors for high-altitude operations, and the construction safety risk is great. The climbing formwork support is based on the hydraulic climbing formwork and is lifted synchronously with the climbing formwork. However, if it is used for a cable tower with a variable cross-section, the track is pre-embedded and the installation accuracy is poor, making the construction difficult.

The Chinese patent with the publication number CN 103898836 A discloses a construction method for the steel slanted leg prestressed support of the H-shaped cable tower of the cable-stayed bridge, which is used in the field of bridge construction. It uses steel slanted leg brackets and arch frames for construction The beam avoids the installation and removal of a large number of steel pipe supports in the high-altitude support method in the prior art, reduces the installation of embedded parts and later repair work during cable tower construction, reduces the workload and materials of high-altitude welding, and greatly reduces the risk of high-altitude operations. At the same time, it also avoids the problems of the reserved compression of the high bracket and the difficulty in setting the camber of the pre-embedded corbel bracket; The horizontal outward component of the downforce is offset by the prestressed steel strand pre-applied at the horizontal tie bar, and the vertical component of the oblique downward force on the lower node is borne by the cable tower. In addition, the asynchronous construction of the cable tower and the beam avoids the high-altitude dismantling and installation of the formwork and climbing frame of the beam side construction cable tower, reduces safety risks, and shortens the construction period. However, the above construction method is only applicable to H-type cable towers of cable-stayed bridges, but not applicable to the construction of cable towers with other cross-sectional shapes.

Contents of the invention

The purpose of this utility model is to provide a mobile tower construction bracket that simplifies the construction process and reduces construction risks in order to overcome the above-mentioned defects in the prior art.

The purpose of this utility model can be achieved through the following technical solutions:

Mobile support for cable tower construction. The system includes steel pipes, climbing frames, lifting frames, hoops, chain hoists and safety wire ropes. There are four steel pipes, which are respectively fixed around the cable tower and can be extended vertically. As a guide rail for fixing and climbing the climbing frame and lifting frame; the climbing frame has three layers, fixed on four steel pipes, and each layer of climbing frame is arranged along the circumference of the cable tower to surround the cable tower; the lifting The frame is fixed on four steel pipes, arranged along the circumference of the cable tower, enclosing the cable tower, and located above the uppermost climbing frame; the hoop is arranged on the steel pipe to support the climbing frame or lifting frame; The chain hoist is connected between two adjacent climbing frames, or between the climbing frame and the lifting frame; the safety wire rope: is connected between the adjacent two layers of climbing frames, or between the climbing frame and the lifting frame between.

Further, the climbing frames on the uppermost layer and the climbing frames on the middle layer are connected as a whole through trusses.

Further, a shaped steel platform is set between the bottommost climbing frame and the cable tower for bottom closure.

Further, it also includes a movable climbing ladder arranged between two adjacent climbing frames or between the climbing frame and the lifting frame.

Further, the climbing frame includes a main frame body and a guardrail, and the guardrail is arranged on the main frame body; a ladder channel is provided inside the climbing frame, and a steel wire mesh is arranged around the climbing frame to fully seal it.

Further, the platform and the guardrail of the lifting frame are closed with barbed wire.

Further, four steel bars are welded along the steel pipe wall at the bottom of the hoop as a safety support.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

1. The auxiliary support system of the utility model can be applied to tower cables with variable cross-sectional shapes or variable diameters. Only through this auxiliary support system, the construction of different cross-section sections of the entire tower cable can be completed without multiple sets of auxiliary supports, so the construction is convenient. , while saving installation and operation time, and can also reduce the production cost of the auxiliary bracket.

2. The auxiliary support of the utility model is mainly composed of steel pipes that can be extended vertically, a lifting frame, a climbing frame, a chain hoist, a safety wire rope, and a hoop. The structure is simple, and during the construction process, a tower crane is used to lift The height of a cable tower segment is raised, and the climbing frame is lifted by hanging on the lifting frame through a chain hoist, so it is convenient to lift up and down, and the support of the lifting frame or climbing frame is realized by locking the hoop, which is easy to operate.

3. Set the upper and lower ladder passages in the climbing frame, and set up movable ladders between two adjacent layers of climbing frames or between the climbing frame and the lifting frame to realize the movable operation between different layers.

4. A shaped steel platform is set between the bottom climbing frame and the cable tower to close the bottom of the pocket, and a steel wire mesh is set around the climbing frame to fully seal it. The platform and guardrail of the lifting frame are closed with barbed wire, and 4 pieces are welded along the steel pipe wall at the bottom of the hoop. Steel bars are used as insurance supports, therefore, the auxiliary support system of the utility model is stable and safe, and reduces construction risks.

Description of drawings

Fig. 1 is a structural schematic diagram of the auxiliary support system for cable tower construction of the present invention.

Numbers in the figure: 1 is steel pipe, 2 is lifting frame, 3 is climbing frame, 4 is hoop, 5 is chain hoist, 6 is safety wire rope, 7 is movable ladder, 8 is tower crane, 9 is ladder passage, 10 is Elevator, 11 is a cable tower segment.

detailed description

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example

As shown in Figure 1, a mobile support for cable tower construction, the system includes a steel pipe 1, a climbing frame 3, a lifting frame 2, a hoop 4, a chain hoist 5, a safety wire rope 6 and a movable ladder 7. Steel pipe 1 is provided with four, is respectively fixed around the cable tower, and can vertically lengthen, as climbing frame 3, the guide rail that lifting frame 2 fixes and climbs. The climbing frame 3 is provided with three layers, which are fixed on four steel pipes 1, and each layer of climbing frame 3 is arranged along the circumference of the cable tower to surround the cable tower. Frames 3 are connected as a whole by trusses. A profiled steel platform is set between the bottom climbing frame 3 and the cable tower to close the bottom of the pocket. The climbing frame 3 comprises a main frame body and a guardrail, and the guardrail is located on the main frame body; the upper and lower ladder passages 9 are set in the climbing frame 3, and the steel wire mesh is fully enclosed around the climbing frame 3. Lifting frame 2 is fixed on four steel pipes 1, is arranged along cable tower circumferential direction, and cable tower is enclosed in, and is positioned at the top of uppermost climbing frame 3, and the platform of lifting frame 2 and guardrail adopt barbed wire to seal. The hoop 4 is arranged on the steel pipe 1 for supporting the climbing frame 3 or the lifting frame 2, and 4 steel bars are welded along the steel pipe wall at the bottom of the hoop 4 as a safety support. The chain block 5 is connected between two adjacent climbing frames 3 , or between the climbing frame 3 and the lifting frame 2 . The safety wire rope 6 is connected between two adjacent climbing frames 3, or between the climbing frame 3 and the lifting frame 2. Movable climbing ladder 7 is arranged between adjacent two layers of climbing frames 3 or between climbing frame 3 and lifting frame 2 .

The construction method of the mobile support for cable tower construction comprises the following steps:

a. Through the embedded parts on the bearing platform, install four steel pipes 1 as the guide rails of the entire auxiliary support. The four steel pipes 1 are connected as a whole by cross-connection pipes. The steel pipe 1 is provided with a horizontal connection every 24 meters along the height direction. At the same time, the steel pipe 1 is provided with a wall attachment fixedly connected with the tower every 6 meters along the height direction; when connecting two steel pipes 1 for welding, the joint of the steel pipe is fully welded, and a stiffening steel plate is welded outside the joint of the steel pipe;

b. Install the bottom climbing frame: first install four hoops 4 on the steel pipe, use the hoops 4 locked on the steel pipe as a support, install the bottom climbing frame 3 in blocks, and install the remaining two layers of climbing frames for the same reason. frame 3 and lifting frame 2;

c. Hang a chain hoist 5 as a lifting power device between the two adjacent climbing frames 3, and between the climbing frame 3 and the lifting frame 2, and connect the safety wire rope 6;

d. After completing the cable tower construction of a segment, connect 4 steel pipes 1, use the tower crane 8 to raise the height of a cable tower segment of the lifting frame 2, and the uppermost climbing frame 3 is hung on the lifting frame 2 through the chain hoist 5 For lifting, the lower climbing frame 3 is lifted by hanging on the adjacent upper climbing frame 3 through the hand chain hoist 5, and the position of the hoop 4 is adjusted so that the hoop 4 is locked on the steel pipe 1 and supported at the new height of the climbing frame 3 or below the lifting frame 2 to complete a process cycle.

In this embodiment, the total height of the cable tower is 107.928m, the elevation of the tower top is +114.502m, and the height above the bridge deck is 81.107m. The section of the cable tower is transformed from a combination of "circle" and "square". The cable tower is a circular section section 39.0m down from the top of the tower, and then changes from a circular section to a rectangular section section at the bottom of the tower. The diameter of the top section of the tower is 6.5m, and the diameter of the section where the circular section begins to change to the rectangular section is 5.5m. The minimum size of the tower column. According to the structural characteristics of the cable tower, the position of the corbel and the construction requirements of the anchorage section of the cable-stayed cables on the upper tower column, the cable tower is divided into 19 construction sections. The 1st and 2nd sections of the cable tower are constructed using conventional double-row scaffolding, and the 3rd to 19th sections are constructed using the auxiliary support system of the utility model.

The steel pipe 1 adopts a large-diameter spiral steel pipe such as a steel pipe with an outer diameter of 80 cm or more. The height of the climbing frame 3 is 3.2m, the main frame body in the climbing frame 3 is 2m high, and the guardrail is 1.2m high; the height of the lifting frame 2 is 1.72 meters, and the three climbing frames are the main bodies of the auxiliary supports for cable tower construction. Insurance wire rope 6 external diameters adopt 28mm. The hoop 4 is provided with 4 corbels, the inner diameter of the hoop is Φ820mm, the panel is 12mm steel plate, the connecting flange is 12mm steel plate, the rib plate is 12mm steel plate, and the hoop flange is connected by 8 M20×100 8.8 grade high-strength bolts. The bolt hole is φ22.

After the cable tower construction is completed, the cable tower segment 11 is connected, the steel pipe 1 is connected to the height of the cable tower segment to be constructed, the hoisting frame 2 is lifted by the tower crane 8, and the hoop 4 is locked. Utilize the hand chain hoist 5 to lift the climbing frame 3 layer by layer, and lock the hoop 4, and hang the safety wire rope 6. Improve the movable ladder 7 and the ladder channel 9 to facilitate the construction workers to go up and down safely from the elevator 10 to the climbing frame.

The above description of the embodiments is for those of ordinary skill in the technical field to understand and use the utility model. It is obvious that those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described here to other embodiments without creative effort. Therefore, the utility model is not limited to the above-mentioned embodiments, and improvements and modifications made by those skilled in the art according to the disclosure of the utility model without departing from the category of the utility model should be within the protection scope of the utility model.

Claims (7)

1. A mobile support for cable tower construction, characterized in that the system includes steel pipes, climbing frames, hoisting frames, hoops, chain blocks and safety wire ropes, and the steel pipes are provided with four, which are respectively fixed around the cable tower , and can be extended vertically, as a guide rail for fixing and climbing the climbing frame and lifting frame; the climbing frame has three layers, fixed on four steel pipes, and each layer of climbing frames is arranged along the circumference of the cable The tower is enclosed inside; the lifting frame is fixed on four steel pipes, arranged along the circumference of the cable tower, surrounding the cable tower, and located above the uppermost climbing frame; the hoop is arranged on the steel pipe for Support the climbing frame or the lifting frame; the chain block is connected between two adjacent layers of climbing frames, or between the climbing frame and the lifting frame; the safety wire rope: connected between two adjacent layers of climbing frames, Or be connected between the climbing frame and the lifting frame. 2. A mobile support for cable tower construction according to claim 1, characterized in that the climbing frame on the uppermost layer and the climbing frame on the middle layer are connected as a whole by trusses. 3. The mobile support for cable tower construction according to claim 1, characterized in that, a shaped steel platform is set between the bottommost climbing frame and the cable tower to close the bottom of the pocket. 4. The mobile support for cable tower construction according to claim 1, further comprising a movable ladder arranged between two adjacent climbing frames or between the climbing frame and the lifting frame. 5. A kind of cable tower construction mobile support according to claim 1, is characterized in that, described climbing frame comprises main frame body and guardrail, and guardrail is arranged on the main frame body; Climbing frame is provided with ladder channel, Steel wire mesh is set around the climbing frame and is fully enclosed. 6. A mobile support for cable tower construction according to claim 1, characterized in that, the platform and guardrail of the lifting frame are closed with barbed wire. 7. A mobile support for cable tower construction according to claim 1, characterized in that four steel bars are welded along the steel pipe wall at the bottom of the hoop as a safety support.