CN209779429U - Landscape walking bridge applying cable tower structure - Google Patents

Abstract

The utility model relates to a landscape walking bridge applying a cable tower structure, which comprises a bridge deck steel box girder, a cable tower steel structure and steel cables and is characterized in that the whole bridge deck steel box girder adopts an arc plane structure, and the bottoms of the two ends of the bridge deck steel box girder are respectively provided with a bridge abutment foundation and a bridge pier foundation and are fixed by embedded parts; the bridge deck steel box girder is transversely not segmented along the cross section direction, is longitudinally divided into 3 sections of a north side span, a middle span and a south side span along the length direction, two adjacent sections of side spans are fixed through butt joints, two groups of cable tower steel structures are erected on each section of side span at equal intervals, and a steel cable is respectively pulled on the left and right of each group of cable tower steel structures. The utility model relates to an use view walking bridge of cable tower structure, structural design is slim and graceful, clean and tidy, pleasing to the eye.

Description

A Landscape Pedestrian Bridge Using Cable Tower Structure

[technical field]

The utility model relates to the technical field of pedestrian bridge construction, in particular to a landscape pedestrian bridge using a cable tower structure.

[Background technique]

In recent years, the construction of public infrastructure projects in my country has developed rapidly. Due to the different terrain conditions, more and more bridges, especially suspension bridges, have been constructed and used, which can greatly increase the span of roads and bridges and save engineering investment. The economic benefits are very obvious. It has been widely used in practical engineering.

[Content of the invention]

The purpose of the utility model is to improve on the basis of the prior art to obtain a landscape pedestrian bridge using a cable tower structure and its installation and construction method.

In order to achieve the above purpose, a landscape pedestrian bridge using a cable tower structure is designed, including a bridge deck steel box girder, a cable tower steel structure, and steel cables. It is characterized in that the bridge deck steel box girder adopts an arc-shaped planar structure as a whole , the abutment foundation and the pier foundation are respectively arranged at the bottom of both ends, and are fixed by embedded parts; There are 3 side spans, and the two adjacent side spans are fixed by butt joints. Two groups of cable tower steel structures are erected at equal intervals on each side span, and each group of cable tower steel structures pulls a steel cable on the left and right.

The landscape pedestrian bridge is a welded box-type three-span cable truss system with a main span of 54.75 meters and a span of 13.85 meters on both sides. The steel structure is welded, and the nodes are welded or pinned.

The north side span length is 28.4m, the bridge deck width is 8m, and the section height is 0.75-0.9m; the mid-span length is 25.6m, the bridge deck width is 8m, and the section height is 0.69-0.9m; Height 0.75 ~ 0.9m.

The steel structure of the cable tower includes a cable tower body, a cable connecting plate, an intermediate steel box girder, and a cantilever beam. And both are 1.5 times the transverse length of the middle steel box girder. The panel of the cable tower body inserted into the middle steel box girder is obliquely fixed, and it is segmented at the connection between the bottom end of the cable tower and the main box girder, so that the overall slope of the cable tower body is 45. °, the two ends of each cable tower body are respectively fixed to the panel of the middle steel box girder with a cable connecting plate for fixing the steel cable.

The butt joint adopts segmental steel beams, palm towers, code boards, and middle closing sections. The segmental steel beams are fixed to one end of one of the side spans of the two adjacent sections via the palm tower, and one end of the other side span is fixed with a middle closing section. segment, and the middle segment is merged through the code board.

The pedestrian bridge has 2 abutments and 2 piers, and the embedded parts at the abutments are bonded by 8 The lower end of the anchor bar is equipped with 160X160X40 anchor plates, each of which is prestressed with 550KN; the embedded parts of the pier include spherical joint compression bearing embedded parts and tension and compression bar structure embedded parts, and the anchor bars of the tension and compression bar structure embedded parts are plug-welded with the anchor plate through the hole , the anchor bars are 8 D=32mm HRB400 steel bars, the anchor plate D=70mm, and the thickness t=30mm.

The utility model relates to a landscape pedestrian bridge using a cable tower structure and an installation and construction method thereof. The structure design is light, clean and beautiful.

[Description of drawings]

Figure 1 is the overall construction flow chart

Figure 2 is the transverse structural diagram of the bridge deck

Figure 3 Pedestrian Bridge Façade Layout

Figure 4 Segmental arrangement of bridge deck girders

Figure 5 Schematic diagram of bridge deck cross section

Figure 6 butt joint form of main steel box girder

Figure 7 Segmented field connection form of cable tower

Figure 8 Embedded parts positioning layout control

Figure 9 Embedded part setting of bridge pier

Marking description in the figure

1 deck steel box girder, 1.1 north side span, 1.2 middle span, 1.3 south side span

2 Cable tower steel structure, 2.1 Cable tower body, 2.2 Cable connection plate, 2.3 Intermediate steel box girder, 2.4 Cantilever beam,

3 steel cables

4 butt joints, 4.1 segmented steel beam, 4.2 palm tower, 4.3 yard board, 4.4 middle closing section,

5 Embedded parts of pier, 5.1 Embedded parts of spherical joint compression bearing, 5.2 Embedded parts of tension and compression bar structure, 6 Embedded parts of abutment.

[Detailed ways]

The technical scheme of the utility model is further described in conjunction with the accompanying drawings and embodiments, which is believed to be clear to those skilled in the art.

Example

The pedestrian bridge is a welded box-type three-span cable truss system with a main span of 54.75 meters and a side span of 13.85 meters. For steel structure welding, the joints are welded or pinned.

The pedestrian bridge crosses Zhangjiatang from south to north, with Huangpu River on the east and Longteng Avenue under construction on the west.

The steel structure engineering content of this bidding section is the production and installation of the corresponding embedded parts of the pedestrian bridge, the steel box girder of the bridge deck, the steel structure of the cable tower and the steel cables. The installation volume of the steel structure project is summarized in the following table (the weight includes hooks and other slings): the total length of the pedestrian bridge is 82.414m; the total steel consumption for steel structure design is about 241 tons (excluding embedded parts, cables, etc.); Q345C is adopted, and all steel components of this project are manufactured and processed by our Greenland Steel Structure Manufacturing Plant, and then transported to the construction site for hoisting.

As shown in Figure 1, a method of installation and construction of a landscape pedestrian bridge using a cable tower structure, including the production and installation of the corresponding embedded parts of the pedestrian bridge, bridge deck steel box girder, cable tower steel structure and steel cables, is characterized in that , with the following steps:

Step 1, segmental pre-assembly, including segmental assembly of bridge deck steel box girder and cable tower segmental assembly; the bridge deck steel box girder is not segmented horizontally along the section direction, and longitudinally divided into north side span and middle span along the length direction , South side span 3 sections; each single cable tower body is divided into sections at the connection between the bottom end of the cable tower and the main box girder; all steel components are manufactured and processed by the steel structure factory and then transported to the construction site for hoisting;

Step 2: Transport in sections. All the steel components of the sections are transported in sections one by one, and all the components are hoisted as they arrive; there is no on-site assembly site for this project, and all the components are hoisted as they arrive, and the assembly work is carried out in the air. In order to ensure the safe operation of floating cranes and transport ships, it is necessary to ensure the navigation capacity of the river (full load draft of floating cranes is 1.8 meters, and the full load draft of transport ships is 1.9 meters). Existing river channels are surveyed, and some shoal areas need to be dredged. The Huangpu River has two high tides and low tides every day. Our company mainly considers fore-tide operations, that is, floating cranes and transport ships enter the operation when the tide is high, complete the hoisting operation, and exit the site when the tide is low.

Step 3, hoisting in sections. The span of the pedestrian bridge is 13.85m*54.75m*13.85m, across Zhangjiatang Port. In order to meet the hoisting requirements, this plan uses a 180-ton floating crane to hoist the bridge deck girder. The name of the ship: Yanrong Thai 608 luffing crane ship;

Step 4, block assembly of the steel box girder, the steel box girder is not segmented horizontally (section direction), and is divided into 3 sections longitudinally (length direction), and the side spans of two adjacent steel box girder sections are fixed by butt joints, The three-section segmental member of the steel box girder has two longitudinal webs to form a box body or add a support to one side of its opening for temporary reinforcement;

Segmentation principle of steel box girder:

1 After segmentation, ensure that the frame has sufficient strength, stiffness and stability.

2 Comply with the steel structure construction process requirements and meet the welding feasibility requirements.

3 Reasonably distribute the size and weight of the segmented steel components to meet the requirements of transportation and hoisting.

4 Due to site conditions (e.g. working at heights), the welding workload and welding stress on site should be considered to reduce the amount of welding that requires penetration welding such as the butt joint of the main steel plate to ensure the welding quality.

5. The segmented member should be equipped with two longitudinal webs to form a box body as much as possible. If it cannot be satisfied, a support should be added to one side of the opening for temporary reinforcement before leaving the factory.

Step 5: After the steel box girder is installed, install the upper cable tower and steel cables. In order to ensure the stability of the steel beam during installation, set up temporary steel brackets on both banks. The steel brackets must meet the construction requirements through checking and calculation. . Set up two groups of cable tower steel structures at equal intervals on each side span through the temporary steel bracket, and complete the segmental installation, and then pull a steel cable on the left and right of each group of cable tower steel structures;

For the section at the connection between the cable tower and the steel box girder, the plate thicknesses used for the cable tower are: 80mm, 60mm, 50mm, 40mm, 30mm, etc., and the structure is complex. In order to meet the construction requirements and transportation requirements, the cable tower adopts a segmented construction process: the connection between the cable tower and the main box girder needs to be segmented. After the pylon is installed, on-site welding is carried out, and the weld seams of on-site welding are required to have a beautiful appearance. After the welding is completed, the ear plate is cut off and polished before painting.

Step 6, welding, painting, removal measures support etc. There are many butt welds on site in this project, especially during the installation of the closing section and the installation of the cable tower, the hoisting of the next section of the steel beam must be completed after welding. For the welding of the welds of the butt joints of the components, the welding of each piece of beam is considered to take 1 day; the erection of safety scaffolding and painting construction are arranged to be completed during the day, and the overlapping operation with welding is carried out, and the additional time taken is not considered. To sum up, this project is divided into 3 sections of steel box girder, and the installation is considered according to the comprehensive construction period of 2 days for each section.

Embedded parts installation technical scheme, the pedestrian bridge has 2 abutments and 2 piers in total, and the embedded parts are set as follows: 8 bonding parts are used for the embedded parts at the abutment The lower end of the anchor bar is equipped with a 160X160X40 anchor plate, each with a prestress of 550KN. The embedded parts of the bridge pier include the embedded parts of the spherical joint compression bearing and the embedded parts of the tension and compression rod structure. Among them, the anchor reinforcement of the embedded part of the tension and compression rod structure is plug-welded with the anchor plate through the hole, the anchor reinforcement is 8 D=32mm HRB400 steel bars, the anchor plate D=70mm, and the thickness t=30mm.

Installation of embedded parts:

1 Pile driving of the pedestrian bridge cap is completed, the reinforcement cage construction is completed, and the embedded parts are installed before concrete pouring. In order to ensure the installation size of the embedded parts and avoid the displacement of the embedded parts due to concrete extrusion during the concrete pouring process, the L75*6 angle steel is now welded into a bracket form and welded with the main reinforcement of the steel cage to make the deformation and displacement of the embedded parts Bits are controlled within the allowable error range. specific methods:

2 The general contractor provides construction control points, and uses SET2C total station to measure and locate the position of embedded parts. After the embedded parts are installed, the concrete is poured. During the concrete pouring process, the position of the embedded parts is measured and controlled in real time, and the displacement of the embedded parts is controlled within the allowable error range.

Specifically in this embodiment, 1 install embedded parts and temporary supports, 2 install GL-1 segmental steel box girder, 3 install GL-2 segmental steel box girder, 4. install 1#, 2#, 5#, 6 # Cable tower and corresponding cable, 5. Perform the first tension on the steel cables N1 and N2 corresponding to 1# cable tower and 6# cable tower, and check the elevation and position of the steel box girder, 6 .Install GL-3 segmental steel box girder, 7. Install 3#, 4# cable towers and corresponding cables for installation, 8. Perform the first tension on steel cables N5 and N6, and adjust other steel cables again cable, so that the cable force of the steel cable meets the design requirements.

Claims (6)

1. A landscape walking bridge applying a cable tower structure comprises a bridge deck steel box girder, a cable tower steel structure and steel inhaul cables, and is characterized in that the whole bridge deck steel box girder adopts an arc-shaped plane structure, and the bottoms of two ends of the bridge deck steel box girder are respectively provided with a bridge abutment foundation and a bridge pier foundation and are fixed by embedded parts; the bridge deck steel box girder is transversely not segmented along the cross section direction, is longitudinally divided into 3 sections of a north side span, a middle span and a south side span along the length direction, two adjacent sections of side spans are fixed through butt joints, two groups of cable tower steel structures are erected on each section of side span at equal intervals, and a steel cable is respectively pulled on the left and right of each group of cable tower steel structures.

2. the landscape foot bridge applying the cable tower structure as claimed in claim 1, wherein the landscape foot bridge is a welded box type three-span cable truss system, the main span is 54.75 m, the two-side span is 13.85 m, and the steel structures are welded, and the nodes are welded or pin-jointed.

3. The landscape foot bridge applying the cable tower structure of claim 1, wherein the north side span length is 28.4m, the bridge deck width is 8m, and the section height is 0.75-0.9 m; the length of the midspan is 25.6m, the width of the bridge deck is 8m, and the height of the cross section is 0.69-0.9 m; the south side span length is 28.4m, the bridge deck width is 8m, and the section height is 0.75-0.9 m.

4. The landscape walking bridge applying the cable tower structure as claimed in claim 1, wherein the cable tower steel structure comprises a cable tower body, a cable connecting plate, a middle steel box girder and a cantilever girder, both ends of the middle steel box girder in the transverse cross-sectional direction are fixed by the cantilever girder, the transverse lengths of the cantilever girders at both ends are equal and are 1.5 times of the transverse length of the middle steel box girder, the cable tower body is inserted into the panel of the middle steel box girder to be obliquely fixed, and is segmented at the joint of the cable tower bottom end and the main box girder, so that the overall inclination of the cable tower body is 45 degrees, and both ends of each cable tower body are respectively fixed with a cable connecting plate on the panel of the middle steel box girder to fix the steel cable.

5. The landscape foot bridge using the cable tower structure according to claim 1, wherein the butt joint comprises a segmented steel beam, a palm tower, a yard plate and a middle folding section, the segmented steel beam is fixed at one end of one side span of two adjacent segments through the palm tower, the middle folding section is fixed at one end of the other side span, and the middle folding section is combined through the yard plate.

6. The landscape foot bridge applying the cable tower structure according to claim 1, wherein the foot bridge has 2 bridge abutments and 2 bridge piers, and 8 embedded parts at the bridge abutments are bondedThe lower end of each anchor bar is provided with a 160X160X40 anchor plate, and each anchor plate is applied with 550KN prestress; the embedded part of the pier is provided with a spherical hinge compression support embedded part and a tension and compression rod structure embedded part, an anchor bar of the tension and compression rod structure embedded part is subjected to plug welding with an anchor plate perforation, the anchor bar is 8D (32 mm) HRB400 steel bars, the anchor plate D (70 mm) and the thickness t (30 mm).