A kind of efficient urban rail transit U-shaped segment beam structure and storage and transportation method

Abstract

The application discloses a kind of efficient urban rail transit U-shaped segment beam structure and storage transportation method for construction, including cross segment;The cross segment is constituted by first bottom plate, first web and first wing plate;The first bottom plate is connected with the first web that is inclined to the outside on both sides, and the first wing plate is located on the top surface of the first web and extends to the outside, and the upper and lower surfaces of the first wing plate are both horizontal plane.The application solves the problems of large occupied area of U-shaped segment beam prefabrication yard, inefficient transportation, aggravating urban road congestion, prefabrication yard construction and high transportation cost and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of construction engineering. More particularly, the present application relates to a construction efficient urban rail transit U-shaped segmental beam structure and a storage and transportation method. BACKGROUND

[0002] There are two laying methods for urban rail transit: underground lines and elevated lines. The construction cost and operation cost of elevated lines are lower than those of underground lines, and most suburban rail transit lines in large and medium-sized cities at home and abroad are planned to be elevated lines. In the selection of beam type of elevated lines, the U-shaped segmental beam has the advantages of high quality, high efficiency, energy saving and environmental protection of the fabricated bridge, and also has the characteristics of safety, beauty, high noise reduction and high cross-section utilization, and is an ideal beam type for urban rail transit. The development and application of U-shaped segmental beam technology is in a stage of rapid promotion internationally.

[0003] The traditional U-shaped segmental beam has a shape of a thin-walled open bottom, which is composed of a bottom plate, a web plate and a flange plate to form a U-shaped cross section. Common U-shaped segmental beam cross sections are shown in Figure 1

[0004] The flange plate of the traditional cross section 1 has a small width, and the inner width of the top opening is lower than the outer width of the bottom plate, which cannot meet the demand of double-layer storage. The cross sections 2 and 3 widen the width of the flange plate, and can generally meet the demand of double-layer storage through special support design, but as the number of storage layers increases, on the one hand, the height is relatively high and the stability is poor, and on the other hand, the outer side of the web plate and the bottom plate of the lower beam body bear a large tensile stress, which generally cannot be stored for three or more layers. Therefore, for the U-shaped segmental beam precast yard, in order to achieve the rated beam storage capacity, a large area of land needs to be rented to store the precast segmental beam, which increases the construction cost of the precast yard.

[0005] After the storage period of the U-shaped segmental beam is over, it needs to be transported to the construction site for erection by a flatbed trailer. Due to the characteristics of the current U-shaped segmental beam cross section, the double-layer storage and transportation method will face the problem of limited urban road clearance, so it can only be transported single-pile. This results in low transportation efficiency of the U-shaped segmental beam, and due to the increase in train frequency, large vehicle type and slow transportation speed, the original traffic capacity of the urban road is reduced. SUMMARY

[0006] The purpose of the present application is to consider the whole life cycle cost optimization, propose a U-shaped segmental beam with reasonable stress, comprehensive function and construction efficiency, and solve the problems of large land occupation of U-shaped segmental beam precast yard, low transportation efficiency, aggravation of urban road congestion, high construction cost of precast yard and transportation cost.

[0007] ​The technical solution adopted by the present invention to solve this technical problem is: a U-shaped segmental beam structure for constructing efficient urban rail transit, including a mid-span segment; the mid-span segment is composed of a first bottom plate, a first web plate and a first wing plate; the first bottom plate is connected to the two sides of the first web plate that are inclined outwards, the first wing plate is located on the top surface of the first web plate and extends outwards, and the upper and lower surfaces of the first wing plate are both horizontal.

[0008] Preferably, the bottom surface of the first base plate is horizontal, the top surface of the first base plate has a bidirectional or unidirectional transverse slope, the first base plate contains a number of horizontally arranged prestressed ducts, and a shear key is provided in the middle of the end face of the first base plate;

[0009] Pre-embedded channels are provided at intervals on the inner wall of the first web plate. The cable bracket is connected to the pre-embedded channels by T-bolts to support the signal communication cable. The first web plate contains several prestressed pipes. Several shear keys are arranged at intervals on the end face of the first web plate.

[0010] A steel-structured widening platform is installed at the junction of the first wing plate and the first web plate; a guardrail is arranged on the outer side of the upper surface of the first wing plate, and the guardrail is connected to the concrete beam through embedded parts; the first wing plate contains several prestressed ducts; and several shear keys are arranged at intervals on the end face of the first wing plate.

[0011] Preferably, the widening platform consists of a support fixed on the pre-embedded channel, a longitudinal channel steel arranged above the support, and a steel plate arranged on the top surface of the longitudinal channel steel.

[0012] The steel plate is seamlessly connected to the concrete of the first wing plate.

[0013] Preferably, multi-functional rods are provided at intervals on the outer vertical surface of the first wing plate for placing electromechanical facilities; the multi-functional rods are connected to the outer vertical surface of the first wing plate through embedded parts;

[0014] An arc-shaped PE pipe is pre-embedded inside the first wing plate to pass the signal communication cable from the cable bracket to the internal space of the multi-functional pole.

[0015] Preferably, it also includes a pier top segment; the pier top segment is composed of a second bottom plate, a second web plate and a second wing plate; the second bottom plate is connected to the two sides of the second web plate that are inclined outwards, the second wing plate is located on the top surface of the second web plate and extends outwards, and the upper and lower surfaces of the second wing plate are both horizontal.

[0016] Preferably, the bottom surface of the second base plate is horizontal, and the top surface of the second base plate has a two-way or one-way transverse slope; several post-tensioned anchors are provided on the end face of the second base plate;

[0017] Pre-embedded channels are provided at intervals on the inner wall of the second web plate. The cable bracket is connected to the pre-embedded channels by T-bolts to support the signal communication cable. The second web plate contains several prestressed ducts. Several post-tensioned anchors are provided on the end face of the second web plate.

[0018] A steel-structured widening platform is installed at the junction of the second wing plate and the second web plate; a guardrail is arranged on the outer surface of the upper surface of the second wing plate, and the guardrail is connected to the concrete beam through embedded parts; multi-functional poles are set at intervals on the outer vertical surface of the second wing plate for placing electromechanical facilities; the multi-functional poles are connected to the outer vertical surface of the second wing plate through embedded parts; curved PE pipes are embedded inside the second wing plate for passing signal communication cables from the cable bracket to the internal space of the multi-functional poles; the second wing plate contains several prestressed ducts; several post-tensioned anchors are installed on the end face of the second wing plate.

[0019] Preferably, the steel plate of the widened platform located at the second wing plate is in line with the concrete of the second wing plate.

[0020] Preferably, the pier top segment is connected to the pier via a bearing.

[0021] This invention also provides a method for storing and transporting efficient U-shaped segmental beam structures for urban rail transit. The storage method is as follows: before the widening platform, guardrails, and multi-functional poles are installed on the pier top segments and mid-span segments, several pier top segments / mid-span segments are stacked using semi-rigid supports. The self-weight of the upper segment of the pier top segment / mid-span segment is transferred to the upper part of the first / second wing plate of the lower segment through the semi-rigid supports. After being transferred to the bottom layer, the bottommost pier top segment / mid-span segment is transferred to the concrete abutment through the semi-rigid supports. For each layer of segments, the supports are located on the same vertical centerline.

[0022] The segment transportation method is as follows: after stacking two segments, place them on a steel pedestal and anchor them to a flatbed trailer with fixing ropes.

[0023] The present invention offers at least the following beneficial effects: It proposes a U-shaped segmental beam for efficient urban rail transit construction, employing an outward-inclined web and horizontal flange structure. This design balances rational stress distribution and comprehensive functionality, while also enabling multi-layer stacking, thus improving storage and transportation efficiency. It addresses the problems of large prefabrication yard footprints, inefficient transportation, exacerbation of urban traffic congestion, and high construction and transportation costs associated with U-shaped segmental beams.

[0024] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0025] Figure 1 These are three common cases of U-shaped segmental beam cross-sections;

[0026] Figure 2 This is a typical elevation layout diagram of the U-shaped segmental beam of the present invention;

[0027] Figure 3 This is a cross-sectional layout diagram of the mid-span segment of the bridge according to the present invention;

[0028] Figure 4 This is a cross-sectional layout diagram of the bridge pier top segment of the present invention;

[0029] Figure 5 This is the main view of the multi-segment storage of the present invention;

[0030] Figure 6 This is a side view of the multi-segment storage of the present invention;

[0031] Figure 7 This is a schematic diagram of the segmented multi-layer transportation of the present invention.

[0032] Explanation of reference numerals in the attached drawings: 1. Mid-span segment, 2. Pier top segment, 3. Support, 4. Pier, 5. Embedded channel, 6. Guardrail, 7. Multifunctional pole, 8. Shear key, 9. Signal communication cable, 10. Power cable, 11. Prestressed duct, 12. Track, 13. Post-cast track beam, 14. Cable support, 15. Widening platform, 16. Post-tensioned anchor, 17. Semi-rigid support, 18. Concrete platform, 19. Fixing rope, 20. Flatbed trailer. Detailed Implementation

[0033] The present invention will now be described in detail and completely with reference to the accompanying drawings. Those skilled in the art will be able to implement the present invention based on these descriptions. Before describing the present invention with reference to the accompanying drawings, it should be particularly noted that the technical solutions and features provided in various parts of the present invention, including the following description, can be combined with each other without conflict.

[0034] Furthermore, the embodiments of the present invention described below are generally only some, not all, of the embodiments of the present invention. Therefore, all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The specific implementation process is as follows:

[0036] like Figures 2 to 4 As shown, this invention proposes a U-shaped segmental beam for efficient urban rail transit construction. Based on beam type, it mainly consists of two types of segments: mid-span segment 1 and pier-top segment 2. A typical elevation of this structure is shown below. Figure 2 As shown, both the mid-span segment 1 and the pier top segment 2 are prefabricated in the prefabrication yard using the short-line matching method. After being transported to the site, they are hoisted and tensioned with prestressed steel strands by a bridge erecting machine to form the superstructure of the entire span bridge.

[0037] The mid-span segment 1 is composed of a first base plate, a first web plate, and a first wing plate. The first base plate is connected to the two sides of the first web plate, which is inclined outward. The first wing plate is located on the top surface of the first web plate and extends outward. The upper and lower surfaces of the first wing plate are both horizontal. The first base plate is the component that directly bears the load of a single-track or double-track subway train. The load is transferred to the first base plate of the U-shaped segment beam through the track 12 and the post-cast track beam 13.

[0038] This technical solution may also include the following technical details to better achieve the technical effect: the bottom surface of the first base plate is a horizontal plane, and the top surface of the first base plate has a two-way or one-way transverse slope to facilitate drainage; the first base plate contains several horizontally arranged prestressed pipes 11 for threading the prestressed steel strands of the first base plate during installation; a shear key 8 is provided in the middle of the end face of the first base plate to serve as a positioning tool for the first base plate during assembly.

[0039] Pre-embedded channels 5 are provided at intervals on the inner wall of the first web plate. The cable bracket 14 is connected to the pre-embedded channels 5 by T-bolts to support the signal communication cable 9. The power cable 10 is arranged in the space between the chamfer of the first web plate and the first base plate. The first web plate contains several prestressed pipes 11 for passing through the prestressed steel strands of the first web plate during installation. Several shear keys 8 are arranged at intervals on the end face of the first web plate, which are the main structures for transmitting shear force between segments.

[0040] The upper surface of the first wing plate supports the evacuation passage. To achieve a lightweight design of the segment and to fully utilize the gap between the train boundary space and the first wing plate, a steel widening platform 15 is installed at the junction of the first wing plate and the first web plate to widen the upper surface of the first wing plate, ensuring that the evacuation passage has sufficient width and facilitating pedestrians to descend from the train onto the evacuation platform. Guardrails 6 are arranged on the outer side of the upper surface of the first wing plate. The guardrails 6 are connected to the concrete beam through embedded parts to protect pedestrians from falling. The first wing plate contains several prestressed ducts 11 for threading the prestressed steel strands during installation. Several shear keys 8 are arranged at intervals on the end face of the first wing plate to serve as positioning tools for the first wing plate.

[0041] This technical solution may also include the following technical details to better achieve the technical effect: the widening platform 15 is composed of a bracket fixed on the pre-embedded channel 5, a longitudinal channel steel arranged above the bracket, and a stainless steel patterned steel plate arranged on the top surface of the longitudinal channel steel.

[0042] The stainless steel patterned steel plate is seamlessly connected to the first wing plate concrete. It is preferred to use stainless steel patterned steel plate, whose material and surface raised structure increase service life and safety.

[0043] This technical solution may also include the following technical details to better achieve the technical effect: multi-functional poles 7 are provided at intervals on the outer vertical surface of the first wing plate for placing electromechanical facilities such as signal lights, radios, WIFI, and lightning rods; the multi-functional poles 7 are connected to the outer vertical surface of the first wing plate through embedded parts;

[0044] An arc-shaped PE pipe is pre-embedded inside the first wing plate to pass the signal communication cable 9 from the cable bracket 14 to the internal space of the multi-functional pole 7.

[0045] This technical solution may also include the following technical details to better achieve the technical effect: it also includes a pier top segment 2; the pier top segment 2 is composed of a second bottom plate, a second web plate and a second wing plate; the two sides of the second bottom plate are connected to the second web plate that is inclined outward, the second wing plate is located on the top surface of the second web plate and extends outward, and the upper and lower surfaces of the second wing plate are both horizontal.

[0046] This technical solution may also include the following technical details to better achieve the technical effect: the bottom surface of the second base plate is a horizontal plane, and the top surface of the second base plate has a two-way or one-way transverse slope to facilitate drainage; several post-tensioned anchors 16 are provided on the end face of the second base plate;

[0047] Pre-embedded channels 5 are provided at intervals on the inner wall of the second web. The cable bracket 14 is connected to the pre-embedded channel 5 by T-bolts to support the signal communication cable 9. The power cable 10 is arranged in the space between the chamfer of the second web and the second bottom plate. The second web contains several prestressed pipes 11 for passing through the prestressed steel strands of the second web during installation. Several post-tensioned anchors 16 are provided on the end face of the second web.

[0048] The upper surface of the second wing plate supports the evacuation passage. To achieve a lightweight design of the segment and to fully utilize the gap between the train boundary space and the second wing plate, a steel-structured widening platform 15 is installed at the junction of the second wing plate and the second web plate. This widens the upper surface of the second wing plate, ensuring sufficient width for the evacuation passage and facilitating pedestrian access from the train to the evacuation platform. Guardrails 6 are installed on the outer side of the upper surface of the second wing plate, connected to the concrete beam via embedded parts, to protect pedestrians from falls. Multifunctional poles 7 are spaced along the vertical outer surface of the second wing plate for placing signal lights and radios. The structure includes electromechanical facilities such as WIFI and lightning rods; the multi-functional pole 7 is connected to the outer vertical surface of the second wing plate through embedded parts; an arc-shaped PE pipe is embedded inside the second wing plate to pass the signal communication cable 9 from the cable bracket 14 to the internal space of the multi-functional pole 7; the second wing plate contains several prestressed pipes 11 for passing the prestressed steel strands through the second wing plate during installation; several post-tensioned anchors 16 are set on the end face of the second wing plate for anchoring the prestressed steel strands.

[0049] This technical solution may also include the following technical details to better achieve the technical effect: the steel plate of the widened platform 15 located at the second wing plate is smoothly connected to the concrete of the second wing plate, preferably using a stainless steel patterned steel plate, whose material and surface raised structure increase service life and safety.

[0050] This technical solution may also include the following technical details to better achieve the technical effect: the pier top segment 2 is connected to the pier 4 through the support 3.

[0051] In another embodiment, such as Figures 5 to 6 As shown, a method for storing and transporting efficient U-shaped segmental beam structures for urban rail transit is described. The storage method involves stacking several pier-top segments 2 and mid-span segments 1 using semi-rigid supports 17, before the installation of widening platforms 15, guardrails 6, and multi-functional poles 7. The self-weight of the upper segments of the pier-top segments 2 and mid-span segments 1 is transferred to the first / second wing plates of the lower segments via the semi-rigid supports 17. After reaching the bottom layer, the weight of the bottommost pier-top segments 2 and mid-span segments 1 is transferred to the concrete platform 18 via the semi-rigid supports 17. For each layer of segments, the supports are located on the same vertical centerline, and the vertical load is directly transferred to the foundation, resulting in minimal stress differences between the beam layers. During segment stacking, the overlapping heights of the upper and lower layers further compress the space and increase the overall stability during multi-layer storage. Due to the special design of the segment shape, up to five layers of segments can be stored. Figure 5 As shown.

[0052] like Figure 7 As shown, the segmental transportation method specifically involves transporting two segments simultaneously in a single trip. During transportation, two segments (either the pier top segment 2 or the mid-span segment 1) are stacked and placed on a steel platform, then anchored to a flatbed trailer 20 using fixing ropes 19. Multi-level segmental transportation is as follows: Figure 6 As shown. Due to the overlap of vertical spaces, the clearance requirements for two-story transport in urban road environments can be avoided. Transporting two vehicles at a time directly doubles the transport efficiency, alleviating urban traffic congestion to some extent.

[0053] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and embodiments shown and described herein.

Claims

1. A U-shaped segmental beam structure for efficient construction of urban rail transit, characterized in that, It includes a mid-span segment; the mid-span segment is composed of a first base plate, a first web plate and a first wing plate; the first base plate is connected to the two sides of the first web plate that are inclined outwards, the first wing plate is located on the top surface of the first web plate and extends outwards, and the upper and lower surfaces of the first wing plate are both horizontal. The bottom surface of the first base plate is horizontal, and the top surface of the first base plate has a two-way or one-way transverse slope; the first base plate contains several horizontally arranged prestressed ducts; a shear key is provided in the middle of the end face of the first base plate; Pre-embedded channels are provided at intervals on the inner wall of the first web plate. The cable bracket is connected to the pre-embedded channels by T-bolts to support the signal communication cable. The first web plate contains several prestressed pipes. Several shear keys are arranged at intervals on the end face of the first web plate. A steel-structured widening platform is installed at the junction of the first wing plate and the first web plate; a guardrail is arranged on the outer side of the upper surface of the first wing plate, and the guardrail is connected to the concrete beam through embedded parts; the first wing plate contains several prestressed ducts; several shear keys are arranged at intervals on the end face of the first wing plate. The widening platform consists of a support fixed on a pre-embedded channel, a longitudinal channel steel arranged above the support, and a steel plate arranged on the top surface of the longitudinal channel steel. The steel plate is seamlessly connected to the concrete of the first wing plate.

2. The U-shaped segmental beam structure for constructing efficient urban rail transit as described in claim 1, characterized in that, Multifunctional rods are installed at intervals on the outer vertical surface of the first wing plate for placing electromechanical facilities; the multifunctional rods are connected to the outer vertical surface of the first wing plate through embedded parts; An arc-shaped PE pipe is pre-embedded inside the first wing plate to pass the signal communication cable from the cable bracket to the internal space of the multi-functional pole.

3. The U-shaped segmental beam structure for constructing efficient urban rail transit as described in any one of claims 1 to 2, characterized in that, It also includes the pier top segment; the pier top segment is composed of a second bottom plate, a second web plate and a second wing plate; the second bottom plate is connected to the two sides of the second web plate that are inclined outwards, and the second wing plate is located on the top surface of the second web plate and extends outwards, and the upper and lower surfaces of the second wing plate are both horizontal.

4. The U-shaped segmental beam structure for constructing efficient urban rail transit as described in claim 3, characterized in that, The bottom surface of the second base plate is horizontal, and the top surface of the second base plate has a two-way or one-way transverse slope; several post-tensioned anchors are installed on the end face of the second base plate; Pre-embedded channels are provided at intervals on the inner wall of the second web plate. The cable bracket is connected to the pre-embedded channels by T-bolts to support the signal communication cable. The second web plate contains several prestressed ducts. Several post-tensioned anchors are provided on the end face of the second web plate. A steel-structured widening platform is installed at the junction of the second wing plate and the second web plate; a guardrail is arranged on the outer surface of the upper surface of the second wing plate, and the guardrail is connected to the concrete beam through embedded parts; multi-functional poles are set at intervals on the outer vertical surface of the second wing plate for placing electromechanical facilities; the multi-functional poles are connected to the outer vertical surface of the second wing plate through embedded parts; curved PE pipes are embedded inside the second wing plate for passing signal communication cables from the cable bracket to the internal space of the multi-functional poles; the second wing plate contains several prestressed ducts; several post-tensioned anchors are installed on the end face of the second wing plate.

5. The U-shaped segmental beam structure for constructing efficient urban rail transit as described in claim 4, characterized in that, The steel plate of the widened platform located at the second wing plate is seamlessly connected to the concrete of the second wing plate.

6. The U-shaped segmental beam structure for constructing efficient urban rail transit as described in claim 5, characterized in that, The pier top segment is connected to the pier via supports.

7. A method for storing and transporting efficient U-shaped segmental beam structures for urban rail transit as described in any one of claims 3 to 5, characterized in that, The specific storage method is as follows: Before the widening platform, guardrails, and multi-functional poles are installed on the pier top segment and the mid-span segment, several pier top segments / mid-span segments are stacked using semi-rigid supports. The self-weight of the upper segment of the pier top segment / mid-span segment is transferred to the upper part of the first / second wing plate of the lower segment through the semi-rigid supports. After being transferred to the bottom layer, the bottom pier top segment / mid-span segment is transferred to the concrete abutment through the semi-rigid supports. For each layer of segments, the supports are located on the same vertical centerline. The segment transportation method is as follows: after stacking two segments, place them on a steel pedestal and anchor them to a flatbed trailer with fixing ropes.

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