CN111636294A - A high-pier and large-span station bridge structure for high-speed railway in difficult and dangerous mountainous areas - Google Patents

Abstract

A high-pier and large-span station bridge structure for high-speed railways in difficult mountainous areas. Under the premise of meeting the normal overtaking of trains and the minimum horizontal space spacing requirements for passengers starting, arriving and alighting at the station, it avoids setting up high-pier and large-span platform bridges separately, significantly reducing engineering costs. cost, and the bridge construction is safer and more convenient. The bridge pier is composed of left and right piers arranged at intervals in the transverse bridge direction. The bridge span is composed of left and right beams arranged side by side. The left beam is located on the left pier and the right beam is located. The body is located on the right pier, forming two side-by-side high-pier and long-span prestressed concrete girder bridges. On the left beam body, the left platform, the left line to the departure line and the left line of the railway main line are set in order from the outside to the inside, and the right beam body is set from the outside to the inside. The right line of the line is arranged laterally symmetrically on the left beam body and the right beam body.

Description

A high-pier and large-span station bridge structure for high-speed railway in difficult and dangerous mountainous areas

technical field

The invention relates to bridge engineering, in particular to a high-pier and large-span station bridge structure for a high-speed railway in difficult and dangerous mountainous areas.

Background technique

In recent years, the construction of long-span bridges on high-speed railways in mountainous areas in my country has achieved rapid development. The terrain in difficult and dangerous mountainous areas has large fluctuations, the space is narrow, and the site conditions are difficult to meet the requirements of the station yard; and the high-speed railway has high technical standards, large curve radius, and difficult to extend. Therefore, high-speed railways in difficult and dangerous mountainous areas often set the station platform on the bridge, set up the platform bridge, and make full use of the only mountain passage and yard to set up the station. Combined with the scale of high-speed railway stations in mountainous areas, station bridges generally consist of platforms, station-to-departure lines and main railway lines. Take the 4-line railway (line 2 main line + line 2 station-to-departure line) + 2 platforms as an example, the two-line main line is located in the middle, the trains passing the station can directly cross the line, and the 1-line station-to-departure line + 1 platform (the length of the platform is generally 450m, the width is 8m, and a canopy is set on the platform). The two main lines in the middle are set on one bridge, that is, a double-line bridge is used. The station arrival and departure lines and the platform on both sides are independently set up with single-width bridges to pass through. The combined construction of the station and bridges of the whole station adopts a total of 5 bridges to pass through. That is, 1 double-track bridge + 4 single-track bridges; ② In order to reduce the horizontal width of the bridge, set the 1-line main line + 1-line station arrival and departure line on the same bridge, and the platform part is set up with a separate platform bridge, so that the whole station A total of 4 bridges are used to pass through the joint construction part of the station and bridge, namely 2 double-track bridges + 2 platform bridges; ③ Another arrangement method is to arrange the railway line and the platform separately, that is, the middle 4-line railway (the 2-line main line The +2 line to and from the line) are set on the same bridge, that is, the 4-line bridge, and the platforms on both sides are respectively passed through platform bridges, and the combined part of the station bridges of the whole station is crossed by 3 bridges in total, that is, 1 bridge with 4 bridges. Line bridge + 2 platform bridges.

The above three layout methods have the following shortcomings: the three layout methods are the plan of setting up bridges on both sides of the platform separately. The width of the platform is 8m. beautiful. The above three layout methods can still meet the requirements for low and small-span station bridges in the plain area. However, for high-speed railway station bridges in difficult and dangerous mountainous areas, in order to make full use of the space, the stations are often set in river valleys, and the station bridges need to use high-pier and large-span bridges to pass through. The distance between railway lines of station bridges is usually 6.5m. The above three layout methods cannot meet the space requirements of separate piers for each bridge. Therefore, for the high-pier and large-span station bridges of high-speed railways in mountainous areas, the current layout methods have certain limitations, and cannot solve the problem of the interference of the substructures of each bridge. Moreover, for the platform only used for passengers to get on and off, a separate large-span bridge needs to be set up, resulting in a great waste of building materials, and each bridge is constructed independently, which not only increases the number of construction tools and takes a long construction period, but also has the problem of mutual interference during construction. Affecting construction safety, it is neither economical nor beautiful.

Therefore, for the high-pier and long-span station bridge of the high-speed railway in the difficult and dangerous mountainous areas, it is urgent to find an economical, beautiful and reasonable bridge deck layout method to solve the problem of setting up the station in the narrow space of the high-speed railway in the difficult and dangerous mountainous area.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a high-pier and large-span station bridge structure for a high-speed railway in difficult and dangerous mountainous areas, which avoids setting high piers separately on the premise of meeting the requirements of the normal overtaking of trains and the minimum horizontal space spacing requirements for passengers departing, arriving and alighting at the station. The large-span platform bridge significantly reduces the project cost, and the bridge construction is safer and more convenient.

The technical scheme adopted by the present invention to solve its technical problems is as follows:

The high-pier and large-span station bridge structure of the high-speed railway in difficult mountainous areas of the present invention includes a bridge pier and a bridge span beam body located thereon. The bridge span is composed of a left beam body and a right beam body arranged side by side, the left beam body is located on the left bridge pier, and the right beam body is located on the right bridge pier, forming two side by side. A high-pier and large-span prestressed concrete girder bridge; the left beam body is set from the outside to the inside in order from the left platform, the left line to the departure line and the left line of the main railway line, and the right beam body is set from the outside to the inside. The platform on the right, the arrival and departure line of the right line and the right line of the main railway line are arranged horizontally symmetrically on the left beam body and the right beam body.

The left beam body and the right beam body adopt a prestressed concrete box girder structure, with a single-box single-chamber section or a single-box multi-chamber, and there is an intermediate gap between the inner flange end faces of the left and right beam bodies.

The left platform and the right platform are respectively arranged on the outer flanges of the left beam body and the right beam body.

The beneficial effects of the present invention are mainly reflected in the following aspects:

1. Set the platform for passengers to get on and off in the station as a part of the box girder of the main line bridge, which avoids setting up high-pier and large-span platform bridges separately, and significantly reduces the project cost;

2. The entire station area is a double-width bridge, which makes the bridge structure more concise and beautiful, with less construction interference and higher safety;

3. It is especially suitable for the deck layout of high-pier and large-span station bridges in difficult and dangerous mountainous areas. The structure is simple and beautiful, and it is perfectly integrated with the surrounding natural environment in the mountains and mountains, providing a good spatial solution for high-speed railway stations in mountainous areas.

Description of drawings

This manual includes the following four drawings:

1 is a schematic diagram of the bridge-span elevation layout of a high-pier and large-span station bridge structure of a high-speed railway in difficult and dangerous mountainous areas of the present invention;

Fig. 2 is a typical cross-sectional view of the high-pier and large-span station bridge structure of a high-pier and large-span high-speed railway in difficult and dangerous mountainous areas of the present invention;

3 is a schematic diagram of the layout of a high-pier and large-span station bridge structure bridge span of a high-pier and large-span high-speed railway in difficult and dangerous mountainous areas of the present invention;

FIG. 4 is an enlarged view of part A in FIG. 2 .

The figure shows the components, part names and corresponding marks:

The left platform 10, the left line to the departure line 11, the left line of the main railway line 12, the right line of the main railway line 13, the right line to the departure line 14, the right platform 15, the platform roof 16, the platform vertical wall 17, the platform canopy Column 18, canopy column base 19; bridge span beam body 20, left beam body 20a, right beam body 20b, intermediate gap 20c; pier 30, left pier 30a, right pier 30b; foundation 40.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

1 , 2 and 3 , a high-pier and large-span station bridge structure for a high-pier high-speed railway in difficult mountainous areas of the present invention includes a bridge pier 30 and a bridge span body 20 located thereon. The bridge pier 30 is composed of a left pier 30a and a right pier 30b which are arranged at intervals in the transverse bridge direction, and the bridge span beam body 20 is composed of a left pier 20a and a right pier 20b arranged side by side. 20a is located on the left pier 30a, and the right beam 20b is located on the right pier 30b, forming two side-by-side high pier and large-span prestressed concrete girder bridges. A station is set on the bridge deck of the beam body 20. The scale of the station is 4 railway lines + 2 platforms. The left beam body 20a is sequentially set with the left platform 10, the left line to the departure line 11 and the left side of the main railway line from the outside to the inside. Line 12, on the right beam body 20b, the right platform 15, the right line-to-departure line 14 and the right line 13 of the main railway line are sequentially arranged from the outside to the inside, and the left beam body 20a and the right beam body 20b are horizontally symmetrical. set up. Under the premise of meeting the requirements of the normal passing of trains and the minimum horizontal space distance required for departure, arrival and departure of passengers, it is avoided to set up platform bridges with high piers and large spans separately, which significantly reduces the project cost and makes bridge construction safer and more convenient. The entire station area is a double-width bridge, which makes the bridge structure more concise and beautiful, with less construction disturbance and higher safety.

Referring to FIG. 2 , the left beam body 20a and the right beam body 20b adopt a prestressed concrete box girder structure, with a single-box single-chamber cross-section or a single-box multi-chamber cross-section. There is an intermediate gap 20c between the end faces of the side flanges. The width of the intermediate gap 20c is 10 to 20 cm. While ensuring the layout of the bridge deck ballast bed, it is convenient for the construction of the beam body.

2 and 4 , the left platform 10 and the right platform 15 are respectively disposed on the outer flanges of the left beam body 20a and the right beam body 20b. The left platform 10 and the right platform 15 include a platform roof 16, a platform vertical wall 17 and a platform canopy column 18. The platform vertical wall 17 is arranged at intervals outside the left beam body 20a and the right beam body 20b. on the side flanges. The steel bars of the platform vertical wall 17 extend into the platform roof 16 and the left beam body 20a and the right beam body 20b to form an integral structure. Just above the outer web of the beam body 20b, the load of the canopy column is transmitted to the pier 30 and the foundation 40 through the web.

As an optimized solution, the width of the left platform 10 and the right platform 15 is 8.0m, the distance between the edge of the left platform 10 and the center of the left line to the departure line 11, the edge of the right platform 15 and the right line to the departure line The distance between the center of the line 14 is 1.75m, the distance between the left line to the departure line 11 and the left line 12 of the main railway line, the distance between the right line to the departure line 14 and the right line 13 of the main railway line is 6.5m, and the distance between the left line 12 of the main railway line The distance from the right line 13 of the main railway line is 5.0m.

The invention adopts the simple "vertical wall + top plate" structure to set the platform on the outer flange of the beam body of the main line bridge, avoids the high pier and large-span bridges being separately set on the platform, and can significantly reduce the engineering cost. The platform structure is simple, the force transmission is clear, the construction is convenient, and the construction period is short. It is a safe, economical, applicable and beautiful structure.

The applicant successfully applied the present invention to the bridge design of the Yanjin South Station Bridge of the Chongqing-Kunming High-speed Railway. The scale of Yanjin South Station is 4 railway lines (2 main line + 2 station arrival and departure line) + 2 platforms. The station is set on the Baishui River valley. The main line bridge adopts a rigid frame with a span of (68+128+68)m. The bridge spans the Baishui River, and the bridge deck is nearly 100m away from the river. If the traditional station bridge layout method is adopted, two rigid platform bridges with a span of (68+128+68)m and a bridge deck width of 9m need to be set up separately for this station, which will increase the cost by 33.792 million yuan. With the structure of the present invention, the platform is set on the flange part of the main line bridge, only the box girder needs to be slightly wider, and the foundation of the large span beam part of the main line is used, the structure is simple, the force is clear, and the additional platform part increases The construction cost is 10.560 million yuan. Compared with the original technology, the use of the present invention can save 23.232 million yuan in construction cost, greatly reduce the construction cost and simplify the station structure. It is in harmony with the surrounding environment, the station is more beautiful, and it has become a high-speed railway in difficult and dangerous mountainous areas. Iconic project.

The above only illustrates some principles of the present invention for the construction of a high-pier and large-span station bridge on a high-speed railway in difficult and dangerous mountainous areas. Corresponding modifications and equivalents that may be utilized belong to the scope of the patent application of the present invention.

Claims (5)

1. The utility model provides a big span station bridge structure of high mound of high-speed railway in difficult mountain area, includes pier (30) and the bridge span body (20) of sitting on it, characterized by: the bridge pier (30) is composed of a left bridge pier (30a) and a right bridge pier (30b) which are arranged at intervals in the cross bridge direction, the bridge span beam body (20) is composed of a left beam body (20a) and a right beam body (20b) which are arranged side by side, the left beam body (20a) is located on the left bridge pier (30a), and the right beam body (20b) is located on the right bridge pier (30b), so that two high-pier large-span prestressed concrete beam type bridges which are arranged side by side are formed; the left side beam body (20a) is sequentially provided with a left side platform (10), a left line to the departure line (11) and a railway main line left line (12) from outside to inside, the right side beam body (20b) is sequentially provided with a right side platform (15), a right line to the departure line (14) and a railway main line right line (13) from outside to inside, and the left side beam body (20a) and the right side beam body (20b) are transversely and symmetrically arranged.

2. The high-pier large-span station bridge structure of the high-speed railway in the hard mountainous area as claimed in claim 1, wherein: the left beam body (20a) and the right beam body (20b) adopt a single-box single-chamber section box beam or a single-box multi-chamber section box beam, and a middle gap (20c) exists between the end faces of the inner side flanges of the left beam body (20a) and the right beam body (20 b).

3. The high-pier large-span station bridge structure of the high-speed railway in the hard mountainous area as claimed in claim 2, wherein: the left platform (10) and the right platform (15) are respectively arranged on the outer side flanges of the left beam body (20a) and the right beam body (20 b).

4. A high pier large span station bridge construction of a high speed railway in a hard mountain area as claimed in claim 3, characterized in that: left side platform (10), right side platform (15) include platform roof (16), platform vertical wall (17) and platform canopy post (18), and platform vertical wall (17) cross-bridge sets up on the outside flange of left side width of cloth roof beam body (20a), right side width of cloth roof beam body (20b) to the interval, and the reinforcing bar of platform vertical wall (17) stretches into platform roof (16) and left side width of cloth roof beam body (20a), forms overall structure in right side width of cloth roof beam body (20b), and platform canopy post (18) set up in right-hand member roof beam body (20a), right side width of cloth roof beam body (20b) outside web through canopy post base (19).

5. The high-pier large-span station bridge structure of the high-speed railway in the hard mountainous area as claimed in claim 1, wherein: the width of the left side platform (10) and the right side platform (15) is 8.0m, the distance between the edge of the left side platform (10) and the center of the left line to the line (11), the distance between the edge of the right side platform (15) and the center of the right line to the line (14) are 1.75m, the distance between the left line to the line (11) and the left line (12) of the main railway line, the distance between the right line to the line (14) and the right line (13) of the main railway line are 6.5m, and the distance between the left line (12) of the main railway line and the right line (13) of the main railway line is 5.0 m.

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