Magnetic levitation rail transit bridge vertical channel structure and construction method

Abstract

The invention discloses a vertical channel structure of a magnetic suspension rail transit bridge, and relates to the technical field of magnetic suspension bridge accessory engineering, the vertical channel structure comprises a channel foundation, a curtain board and an evacuation staircase, the channel foundation comprises a plurality of pile foundations and a foundation, and the pile foundations are jointly connected with the foundation; the foundation is connected with two symmetrically-distributed separating type stand columns in the transverse bridge direction through embedded steel bars, embedded parts are arranged in the separating type stand columns, a space is reserved between the two separating type stand columns in advance, evacuation stairs are installed in the reserved space, and a magnetic levitation uplink and a magnetic levitation downlink are arranged at the top ends of the two separating type stand columns respectively. Rail structures are arranged in the maglev ascending line and the maglev descending line, under the daily condition, maintainers can reach the bridge floor through the evacuation stairs to conduct maintenance operation, passengers can reach the vertical channel from the interval evacuation platform to rapidly get off the bridge in the emergency condition, and on the basis that passenger evacuation and maintainer passing are met, the maintenance efficiency is greatly improved. And the arrangement requirements of maglev trains and equipment can also be met.

Description

Technical Field

[0001] The present invention relates to the technical field of maglev bridge auxiliary projects, and particularly to a vertical passage structure and construction method for a maglev rail transit bridge. Background Art

[0002] For suburban maglev rail transit lines, the station spacing is relatively large, and the line preferably adopts elevated laying. The interval length often exceeds 3 kilometers. Although maglev elevated bridges mainly serve train passage, it is a necessary function for maintenance personnel to go up and down the bridge and for emergency evacuation in case of emergencies in the elevated section of rail transit. To improve the efficiency of evacuating passengers in case of emergencies and at the same time take into account the quick up and down of maintenance personnel on the bridge, it is necessary to set up a vertical passage on the elevated section bridge.

[0003] Traditional passenger railways are usually laid outside the city, and are not sensitive to problems such as bridge landscape and land occupation. Their maintenance and personnel evacuation channels are generally set separately. Among them, the evacuation channel is usually set on the outside of the bridge and is connected to the evacuation platforms arranged on both sides of the bridge deck. And the traditional train track structure is relatively low, and the beam part usually adopts large box girders. Maintenance personnel on the bridge deck facilities can easily cross the track to complete the maintenance of the entire bridge deck. For suburban railways, especially maglev rail transit, factors such as land occupation reduction, cost reduction, construction period saving, and improvement of bridge urban landscape must be considered. Therefore, the evacuation platform is usually set in the center of the bridge deck. And maglev rail transit adopts running with the rail held, and the combined height of the track structure and the rail support beam exceeds 1 m, and it is basically impossible for people to cross the track. Therefore, the traditional evacuation channel can no longer meet the maglev evacuation requirements. At present, with the progress of bridge design and construction technology, the double-track juxtaposed U-shaped beam has become a trend in the urban rail field, especially in the field of maglev elevated bridges due to its unique advantages. The relatively high web structure of the U-shaped beam and its mechanical properties further increase the difficulty of setting up the evacuation channel.

[0004] In summary, there is currently a lack of a feasible, highly safe, less land-occupying, good-looking in landscape, simple in construction, and cost-effective method to solve the problem of personnel going up and down the maglev elevated section bridge. Summary of the Invention

[0005] In view of the above technical problems, the present invention discloses a vertical passage structure for a maglev rail transit bridge, which includes a passage foundation, a parapet, and an evacuation staircase. The passage foundation includes pile foundations and a foundation. A plurality of pile foundations are provided, and the plurality of pile foundations are jointly connected to the foundation. Reinforcing bars are embedded in the foundation. In the transverse direction of the bridge, the foundation is connected with two symmetrically distributed separated columns through the embedded reinforcing bars. Embedded parts are arranged in the separated columns. A space is reserved in advance between the two separated columns, and an evacuation staircase is installed in the reserved space. A maglev up-line and a maglev down-line are respectively arranged at the tops of the two separated columns. Track structures are arranged in both the maglev up-line and the maglev down-line. The centers of the maglev up-line and the maglev down-line respectively coincide with the centers of the two separated columns.

[0006] Further, the track structure includes a top cap, which is fixedly connected to the separated column and is arranged in the longitudinal direction of the bridge. The top cap is connected with an intermediate standard U-beam through an intermediate standard beam support. The inside of the intermediate standard U-beam is a track area. The top cap is a reinforced concrete structure or a prestressed reinforced concrete structure.

[0007] Further, a mounting distance not less than that of the evacuation staircase is reserved between the top caps connected to the two separated columns.

[0008] Further, a track bed is arranged in the track area. The track bed is fixedly connected to the inner side of the intermediate standard U-beam. Maintenance passages are arranged on both sides of the track bed. A floating slab is fixedly installed on the track bed.

[0009] Further, parapets are respectively installed on both sides of the track area. The parapets are connected to the intermediate standard U-beam. The parapets are cast-in-place reinforced concrete. The outer surface of the parapets is consistent with the outer surface of the intermediate standard U-beam. The parapets are connected to the top cap. An intermediate evacuation platform is connected to one side of the upper parapet on the outside of the intermediate standard U-beam.

[0010] Further, the evacuation staircase includes a staircase for people to get off the bridge. The staircase is arranged between the two separated columns. The staircase is connected to the two intermediate evacuation platforms. The staircase descends between the separated columns in a folded manner. Multiple staircase platforms are arranged according to the actual on-site situation. The staircase platforms are arranged at the folded positions of the staircase.

[0011] Further, the staircase is made of steel structure or reinforced concrete structure. The staircase is connected to the embedded parts in the separated columns. Railings are installed on both the inside and outside of the staircase. A screen door is arranged at the bottom end of the staircase.

[0012] The present invention also provides a construction method for the vertical passage structure of a maglev rail transit bridge. The specific steps are as follows:

[0013] Step 1: Construct the channel foundation. During construction, first construct multiple pile foundations and then the foundation;

[0014] Step 2: Construct the separated columns. Set up brackets, tie steel bars, install templates, and pour concrete according to the positions of the separated columns. Construct the separated columns to the designed height. When constructing the separated columns, the embedded parts for fixing the stairs should be installed at appropriate positions.

[0015] Step 3: Construction of the top cap. The construction of the top cap should be carried out on a full-floor bracket or a bracket installed on a separate column. After installing the bottom template of the top cap, tie the steel bars and install the side templates. Install the prestressed steel bars and corrugated pipes according to the requirements. Notches are reserved at both ends of the top cap.

[0016] Step 4: After the construction of the shield and track structure and the top cap is completed, the shield and the bridge deck structure, rail support platform and cable trough are constructed. The shield is connected through the embedded parts embedded in the top cap;

[0017] Step 5: Construct the standard U-beam of the interval. The standard U-beam of the interval is prefabricated or cast on site. The ends of the standard U-beam of the interval are overlapped in the notches reserved at both ends of the top cap and fixed by the standard beam support pad stone and standard beam support constructed in advance.

[0018] Step 6: Construction of stairs, which are cast-in-place reinforced concrete structures or factory-made steel structures;

[0019] Step 7: Construct the auxiliary structure of the stairs. After the above steps are completed, construct the railings, shielding doors and protective nets according to the overall progress of the project.

[0020] Compared with the prior art, the present invention has the following advantages: (1) By juxtaposing separate columns in a vertical line direction and arranging evacuation stairs in the gaps between the separate columns, maintenance personnel can reach the bridge deck via the evacuation stairs for maintenance work under normal circumstances. In the event of an emergency, passengers can reach the vertical passage from the interval evacuation platform and quickly get off the bridge. In addition to meeting the requirements for passenger evacuation and maintenance personnel passage, the present invention can also meet the layout requirements of maglev trains and equipment.

[0021] (2) The present invention forms a side elevation that is consistent with the standard beam of the section by setting shields on both sides of the track area. This not only meets the needs of cable laying in the section, but also reduces the abruptness of the landscape caused by the change of structural type, making the bridge facade harmonious and consistent, and greatly improving the landscape effect.

[0022] (3) The vertical off-bridge passage of the maglev bridge provided by the present invention occupies less site, and the construction period is comparable to that of the bridge pier, which can greatly save the construction period. By setting stairs between the separated columns, it can effectively prevent unauthorized personnel from entering the bridge, improve the safety of personnel passage, enhance the psychological sense of security of the evacuated personnel, and reduce the possibility of the stairs being exposed to rain to a certain extent, thereby improving the service life of the stairs and the durability of the structure.

[0023] (4) Compared with the traditional bridge evacuation passage, the off-bridge passage of the maglev bridge provided by the present invention reduces the project scale and has strong economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a front elevation view of the overall structure of the present invention.

[0025] Figure 2 It is a side view of the overall structure of the present invention.

[0026] Figure 3 It is a side view of the middle part of the overall structure of the present invention.

[0027] Figure 4 It is a top plan view of the overall structure of the present invention.

[0028] Figure 5 It is a schematic flow chart of the construction method of the vertical passage structure of the present invention.

[0029] Reference numerals in the drawings: 101 - pile foundation; 102 - foundation; 103 - separated column; 104 - top cap; 105 - fascia; 106 - stairs; 201 - stair landing; 202 - railing; 203 - shielding door; 204 - interval evacuation platform; 205 - interval standard U-beam; 301 - maglev up-line; 302 - maglev down-line; 303 - interval standard beam support; 304 - track area; 305 - maintenance passage; 306 - track support; 307 - floating slab. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0031] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0032] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "install", "connect", and "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0033] Embodiment: As Figures 1-4 shown, a vertical passage structure of a maglev rail transit bridge includes a passage foundation, a parapet 105, and an evacuation staircase. The passage foundation includes pile foundations 101 and a foundation 102. A plurality of pile foundations 101 are provided, and the plurality of pile foundations 101 are jointly connected to the foundation 102. Reinforcing bars are embedded in the foundation 102. Two symmetrically distributed separated columns 103 are connected to the foundation 102 in the transverse direction of the bridge through the embedded reinforcing bars. Embedded parts are provided inside the separated columns 103. A space is reserved in advance between the two separated columns 103, and the evacuation staircase is installed in the reserved space. A maglev up-line 301 and a maglev down-line 302 are respectively provided at the tops of the two separated columns 103. Track structures are provided inside both the maglev up-line 301 and the maglev down-line 302. The centers of the maglev up-line 301 and the maglev down-line 302 respectively coincide with the centers of the two separated columns 103. Through the above solution, in normal situations, the evacuation staircase facilitates maintenance personnel to reach the bridge deck for maintenance operations. In case of an emergency, passengers can quickly get off the bridge through the evacuation staircase. On the basis of meeting the evacuation of passengers and the passage of maintenance personnel, the layout requirements of maglev trains and equipment can also be met.

[0034] The track structure includes two top caps 104, which are respectively fixedly connected to two separated columns 103 and are arranged along the bridge longitudinal direction. By setting the top caps 104, sufficient space is provided for the installation of evacuation stairs. Each of the two top caps 104 is connected to an intermediate standard U-beam 205 through an intermediate standard beam support 303. The space between the two intermediate standard U-beams 205 is a track area 304 for the left and right maglev trains to run. The top cap 104 is a reinforced concrete structure or a prestressed reinforced concrete structure. An installation distance not less than that for the evacuation stairs is reserved between the top caps 104 connected to the two separated columns 103. A rail support 306 is arranged in the track area 304, and the rail support 306 is fixedly connected to the inner side of the intermediate standard U-beam 205. On both sides of the rail support 306 are maintenance channels 305 for maintenance personnel to walk on the beam surface and install cables. A suspension plate 307 is fixedly installed on the rail support 306. On both sides of the track area 304, a parapet 105 is respectively installed. The parapet 105 is connected to the intermediate standard U-beam 205. The parapet 105 is cast in situ with reinforced concrete, and the outer surface of the parapet 105 is flush with the outer surface of the intermediate standard U-beam 205. The parapet 105 is connected to the top cap 104. Through the above solution, the parapets 105 arranged on both sides of the track area 304 form a unified side elevation with the intermediate standard U-beam 205, which can not only meet the requirement of laying interval cables, but also reduce the sense of abruptness of the landscape caused by the change of structural types, making the external facade of the bridge harmonious and consistent, and greatly improving the landscape effect.

[0035] The evacuation stairs include a staircase 106 for people to get off the bridge and two interval evacuation platforms 204 for evacuation in the upward or downward direction in case of emergency. The staircase 106 is arranged between the two separated columns 103, and the staircase 106 is connected to the two interval evacuation platforms 204. The two interval evacuation platforms 204 are respectively located on one side of the upper parapet 105 outside the intermediate standard U-beam 205. The staircase 106 descends between the separated columns 103 in a folded manner. According to the actual situation on site, multiple landing platforms 201 are set, and the landing platforms 201 are set at the folding positions of the staircase 106. The staircase 106 is made of steel structure or reinforced concrete structure, and the staircase 106 is connected to the embedded parts in the separated columns 103. Railings 202 are installed on both the inner and outer sides of the staircase 106, and a screen door 203 is arranged at the bottom end of the staircase 106. Through the above solution, the evacuation stairs are arranged between the separated columns 103, occupying less space, greatly reducing the construction period, preventing unauthorized personnel from entering the bridge, and improving the safety of personnel passage.

[0036] As Figure 5 shown, a construction method for the vertical passage structure of a maglev rail transit bridge specifically includes the following steps:

[0037] Step 1: Construct the foundation of the construction passage. During construction, first construct multiple pile foundations 101, and then construct the foundation 102;

[0038] Step 2: Construct the separated column 103. Set up scaffolds, bind steel bars, install formworks and pour concrete according to the position of the separated column 103, and construct the separated column 103 to the designed height. During the construction of the separated column 103, embedments for fixing the staircase 106 shall be installed at appropriate positions.

[0039] Step 3: Construct the top slab 104. The construction of the top slab 104 shall be carried out on the full hall scaffold or the bracket installed on the separated column 103. After installing the bottom formwork of the top slab 104, bind steel bars and install the side formworks, position and install prestressed steel bars and corrugated pipes as required, and then pour concrete. After the concrete strength and elastic modulus reach the requirements, tension the prestressed steel bundles. Grooves shall be reserved at both ends of the top slab 104.

[0040] Step 4: Construct the parapet and track structure. After the construction of the top slab 104 is completed, construct the parapet 105, the bridge deck structure of the track area 304, the track support 306 and the cable trench. The parapet 105 is connected through the embedments pre-buried in the top slab 104. The track support 306 is a cast-in-place reinforced concrete structure. After the construction of the track support 306 is completed, install the floating slab 307 above the track support 306. The cable trench is set in the parapet 105 or the track area 304 according to the site requirements.

[0041] Step 5: Construct the standard U-shaped beam 205 for the interval. The standard U-shaped beam 205 for the interval is constructed by prefabrication or in-situ casting. The beam ends of the standard U-shaped beam 205 for the interval are lapped in the grooves reserved at both ends of the top slab 104 and fixed through the pre-constructed bearing pads and bearings for the standard beam of the interval.

[0042] Step 6: Construct the staircase 106. The staircase 106 is a cast-in-place reinforced concrete structure on-site or a steel structure staircase manufactured in the factory. When the staircase 106 is a steel structure staircase, lift the staircase 106 in blocks to the predetermined position and fix it through the embedments on the separated column 103. The upper end of the staircase 106 is connected to the interval evacuation platforms 204 in both the up and down directions.

[0043] Step 7: Construct the ancillary structures of the staircase 106. After the above steps are completed, construct the railing 202, the screen door 203 and the protective net according to the overall progress of the project. After the construction of the staircase 106 is completed, install the railing 202, the protective net and the screen door 203 at the lower end of the staircase 106 according to the site construction requirements.

[0044] Those skilled in the art can make various corresponding changes or deformations to the above technical methods and concepts, and all such changes or deformations should fall within the protection scope of the claims of the present invention.

Claims

1. A vertical passage structure for a maglev rail transit bridge, characterized in that: It includes a channel foundation, a shutter (105) and an evacuation staircase. The channel foundation includes pile foundations (101) and a foundation (102). A plurality of pile foundations (101) are provided, and the plurality of pile foundations (101) are jointly connected to the foundation (102). Steel bars are embedded in the foundation (102). In the transverse direction of the bridge, the foundation (102) is connected with two symmetrically distributed separated columns (103) through the embedded steel bars. Embedded parts are arranged in the separated columns (103). A space is reserved in advance between the two separated columns (103), and an evacuation staircase is installed in the reserved space. A maglev up-line (301) and a maglev down-line (302) are respectively arranged at the tops of the two separated columns (103). Track structures are arranged in both the maglev up-line (301) and the maglev down-line (302). The centers of the maglev up-line (301) and the maglev down-line (302) respectively coincide with the centers of the two separated columns (103).

2. The vertical passage structure of a maglev rail transit bridge according to claim 1, characterized in that: The track structure includes a top cap (104). The top cap (104) is fixedly connected to the separated column (103) and the top cap (104) is arranged along the longitudinal direction of the bridge. The top cap (104) is connected with an interval standard U-beam (205) through an interval standard beam support (303). The inside of the interval standard U-beam (205) is a track area (304). The top cap (104) is made of reinforced concrete structure or prestressed reinforced concrete structure.

3. The vertical passage structure of a maglev rail transit bridge according to claim 2, characterized in that: A distance not less than the installation distance of the evacuation staircase is reserved between the top caps (104) connected to the two separated columns (103).

4. The vertical passage structure of a maglev rail transit bridge according to claim 3, characterized in that: A track support table (306) is arranged in the track area (304). The track support table (306) is fixedly connected to the inner side of the interval standard U-beam (205). Maintenance channels (305) are arranged on both sides of the track support table (306). A suspension plate (307) is fixedly installed on the track support table (306).

5. The vertical passage structure of a maglev rail transit bridge according to claim 4, characterized in that: Shutters (105) are respectively installed on both sides of the track area (304). The shutters (105) are connected to the interval standard U-beam (205). The shutters (105) are cast-in-place with reinforced concrete. The outer surface of the shutters (105) is consistent with the outer surface of the interval standard U-beam (205). The shutters (105) are connected to the top caps (104). An interval evacuation platform (204) is connected to one side of the shutter (105) on the outside of the interval standard U-beam (205).

6. The vertical passage structure of a maglev rail transit bridge according to claim 5, characterized in that: The evacuation staircase includes a staircase (106) for people to get off the bridge. The staircase (106) is arranged between the two separated columns (103). The staircase (106) is connected to the two interval evacuation platforms (204). The staircase (106) descends between the separated columns (103) in a folded manner. According to the actual situation on site, a plurality of staircase platforms (201) are set. The staircase platforms (201) are arranged at the folded positions of the staircase (106).

7. The vertical passage structure of a maglev rail transit bridge according to claim 6, characterized in that: The staircase (106) is made of steel structure or reinforced concrete structure. The staircase (106) is connected to the embedded parts inside the separated column (103). Railings (202) are installed on both the inner and outer sides of the staircase (106). A screen door (203) is provided at the bottom end of the staircase (106).

8. A construction method for a vertical passage structure of a maglev rail transit bridge according to any one of claims 1-7 above, characterized in that, The specific steps are as follows: Step 1: Construct the foundation of the construction passage. During construction, first construct multiple pile foundations (101), and then construct the foundation (102). Step 2: Construct the separated column (103). Set up the scaffold, tie the steel bars, install the formwork, and pour the concrete according to the position of the separated column (103), and construct the separated column (103) to the designed height. Embedded parts for fixing the staircase (106) should be installed at appropriate positions during the construction of the separated column (103). Step 3: Construct the top cap (104). The construction of the top cap (104) should be carried out on the full hall scaffold or the bracket installed on the separated column (103). After installing the bottom formwork of the top cap (104), tie the steel bars and install the side formwork, and position and install the prestressed steel bars and corrugated pipes according to requirements. Notch openings are reserved at both ends of the top cap (104). Step 4: Construct the parapet and track structure. After the construction of the top cap (104) is completed, construct the parapet (105), the bridge deck structure of the track area (304), the track support (306), and the cable trough. The parapet (105) is connected through the embedded parts buried in the top cap (104). Step 5: Construct the standard U-shaped beam (205) of the section. The standard U-shaped beam (205) of the section is constructed by prefabrication or in-situ casting. The beam ends of the standard U-shaped beam (205) of the section are lapped in the notch openings reserved at both ends of the top cap (104) and fixed by the pre-constructed standard beam bearing padstone and standard beam bearing of the section. Step 6: Construct the staircase (106). The staircase (106) is a cast-in-situ reinforced concrete structure on-site or a steel structure staircase manufactured in the factory. Step 7: Construct the ancillary structures of the staircase (106). After the above steps are completed, construct the railing (202), the screen door (203), and the protective net according to the overall progress of the project.

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