On-site Construction Technology of Segment Assembled Turnout Girder

Abstract

The present invention relates to an on-site construction process for segmental assembly turnout beams, comprising the following steps: constructing a plurality of support units at longitudinal intervals on a flat and hardened ground foundation, and using a gantry crane to sequentially hoist each segmental beam onto the support units; after all segmental beams are hoisted into place, fine-tuning the segmental beams and temporarily fixing them to the support units; punching, tensioning, and anchoring the steel bar bundles to achieve segmental beam assembly construction; hoisting the turnout rail assembly onto the bridge deck of the segmental assembly turnout beam and assembling it; after fine-tuning to meet the standards, using temporary fixing clips to fix the turnout rails in the track groove of the segmental assembly turnout beam; using a cross-line gantry crane unit to hoist the segmental assembly turnout beam onto the bridge pier; accurately aligning the turnout rails in the track groove with the embedded rails in the section and gluing them in place; removing the temporary fixing clips section by section, and pouring lightweight foamed concrete into the track groove to lock the turnout rails in place. This construction method is applicable to segmental assembly turnout box beams and segmental assembly turnout rail plate beams.

Description

Technical Field

[0001] The present invention relates to the technical field of turnout beams, and in particular to an on-site construction process for segment-assembled turnout beams. Background Art

[0002] A turnout is a connecting device used to allow rolling stock to transfer from one track to another. Turnouts maximize the line's capacity. Even on a single-track railway, laying turnouts and constructing a fork line longer than the length of the train allows trains to run in opposite directions. Therefore, turnouts play a vital role on railway lines.

[0003] A box girder is a type of beam used in bridge construction. It is hollow inside and has flanges on both sides of the upper portion. Reinforced concrete box girders are classified as precast or cast-in-place. A turnout box girder is used to install turnouts.

[0004] Existing turnout box girders are all full-span, extra-wide and extra-long. Due to limited transportation conditions at construction sites for mountainous (military and civilian) rail transit, full-span turnout box girders are difficult to transport to the construction site. Our company has designed a segmented turnout box girder system. These segments are transported to the construction site and assembled there to create a segmented, assembled turnout box girder. This method ensures that each segmented turnout box girder is neither too long nor too wide, adapting to various transportation conditions.

[0005] However, after the turnout segment box girder is transported to the construction site, how to quickly assemble it is also a problem that needs to be considered. Summary of the Invention

[0006] In order to solve the above technical problems, the present application provides an on-site construction process for segmentally assembled turnout beams.

[0007] This application is implemented through the following technical solutions:

[0008] The on-site construction process of segmental assembly turnout beams includes the following steps:

[0009] A plurality of support units are constructed longitudinally at intervals on a flat and hardened ground foundation, the plurality of support units being used to sequentially support the assembly construction of a plurality of segmental beams, and a post-tensioned prestressing channel is reserved in each segmental beam;

[0010] Use a gantry crane to hoist each segment beam onto the supporting unit in sequence;

[0011] After all the segmental beams are hoisted into place, fine-tune the segmental beams and temporarily fix them to the supporting units;

[0012] The steel bar bundles are punched, tensioned and fixed, and grouting and anchoring are performed to realize the assembly construction of segmental beams;

[0013] The turnout rail assembly is hoisted onto the bridge deck of the segmented turnout beam and assembled. After fine-tuning to meet the standards, the turnout rail is fixed in the rail groove of the segmented turnout beam using temporary fixing clips;

[0014] A cross-line gantry crane is used to lift the segmented turnout beams onto the bridge piers;

[0015] The turnout rails in the rail groove are precisely aligned with the embedded rails in the section and fixed with glue;

[0016] The temporary fixing cards are removed section by section, and lightweight foamed concrete is poured into the rail groove section by section to lock the turnout rails.

[0017] Optionally, the support unit includes at least one pair of I-beams, with or without positioning boundary lines adapted to the segmental beams. In particular, positioning boundary lines of standard width are engraved on both ends of the top surface of the upper flange of the I-beam according to the different widths of the segmental beams.

[0018] Optionally, segment beam positioning and fixing fixtures are installed at the left and right ends of the I-beam with bolts; after fine-tuning the segment beam, the segment beam is temporarily fixed using the left and right segment beam positioning and fixing fixtures.

[0019] In particular, the segmental beam positioning and fixing fixture includes a flange sleeve adapted to the flange of the I-beam and a limiting plate for laterally limiting the segmental beam. The bottom of the limiting plate is connected to the flange sleeve, and the flange sleeve has a threaded hole. The limiting plate may or may not be provided with a threaded hole, and the limiting plate and the flange sleeve may be manufactured integrally or not.

[0020] Optionally, a guide arc plate for guiding the falling beam is connected to the top of the limiting plate, and the guide arc plate and the limiting plate are manufactured integrally or not.

[0021] Optionally, when the segment beams are hoisted into place, a guide plate for controlling the longitudinal position is provided between two adjacent segment beams, and the guide plate is bonded and fixed to the segment beams. The guide plate is preferably a plastic sheet to prevent collision.

[0022] Optionally, the segmented assembled turnout beam is formed by splicing 7 segmented beams; corresponding to the positions of the 7 segmented beams on a flat and hardened ground basis, a pair of I-beams are fixedly arranged corresponding to each segmental beam as a supporting unit; the pair of I-beams are located at the beam ends of the corresponding segmental beams and are spaced apart from the corresponding beam end faces.

[0023] Optionally, running rails are laid on one side of the cross-line, and the mobile tarpaulin workshop moves on the running rails; the mobile tarpaulin workshop can move along the running rails to cover multiple segmental beams; the punching, tensioning, fixing, grouting and anchoring operations of the post-tensioned prestressed steel tendons are carried out in the mobile tarpaulin workshop.

[0024] Compared with the prior art, this application has the following beneficial effects:

[0025] 1. This application involves on-site segmental assembly of turnout beams, which facilitates transportation and is applicable to situations with limited transportation conditions, such as mountain rail transit;

[0026] 2. The assembly platform provided by this application is convenient for quick assembly on site, and the construction method is simple and easy to master;

[0027] 3. The turnout box girder of this application is provided with rail grooves, and the turnout rails are locked with lightweight foamed concrete, which combines the functions of track and bridge into one, saving workload, reducing construction costs, and having high cost performance;

[0028] 4. This construction method can be applied to segmental assembly of turnout box beams and segmental assembly of turnout rail plate beams. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the embodiments of the present application, constitute a part of this application, and do not constitute a limitation on the embodiments of the present invention.

[0030] Figure 1 is a top view of the platform body in the embodiment;

[0031] Figure 2 is a three-dimensional diagram of a rail plate beam and a portion of a supporting unit of one of the turnout sections in the embodiment;

[0032] Figure 3 Schematic diagram of a turnout section rail beam, part of the supporting unit and the control guide plate in one embodiment;

[0033] Figure 4 Schematic diagram of the embodiment of the segment beam positioning and fixing fixture when it is sleeved on the I-beam;

[0034] Figure 5 2. It is a structural diagram of the segment beam positioning and fixing fixture in the embodiment;

[0035] Figure 6 This is a schematic diagram of the 1-7 segment beams being hoisted onto the platform body;

[0036] Figure 7 1. is a top view of a segment-assembled turnout beam in an embodiment;

[0037] Figure 8 is a three-dimensional diagram of the segment-assembled turnout rail beam in the embodiment;

[0038] Figure 9 is a three-dimensional diagram of the segment-assembled turnout box girder in the embodiment;

[0039] Figure 10is a layout diagram of the construction site in the embodiment;

[0040] Figure 11 This is a schematic diagram of the segmented assembled turnout box girder erected on the bridge pier in the embodiment. DETAILED DESCRIPTION

[0041] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in a variety of different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0043] It should be noted that, in the absence of any conflict, the embodiments and features of the embodiments of the present invention may be combined with each other. It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to in conjunction with each other.

[0044] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0045] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships typically used when the inventive product is in use, or are commonly understood by those skilled in the art. These terms are intended solely to facilitate the description of the present invention and simplify the description, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," etc., etc., are used solely for distinction and should not be construed as indicating or implying relative importance.

[0046] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0047] In order to facilitate the assembly of segment beams, this embodiment provides an assembly platform for segment-assembled turnout beams. The assembly platform includes a flat and hardened ground foundation and a platform body. Figure 1 As shown, the platform body includes a plurality of support units arranged at intervals in the longitudinal direction, and the plurality of support units are used to sequentially support a plurality of segment beams.

[0048] In one possible design, a positioning boundary line 3 is provided on the support unit. In one possible design, the support unit includes a pair of I-beams 2, and the pair of I-beams 2 is used to support one of the segment beams. In particular, Figure 1-Figure 4 As shown, according to the different widths of the segment beams, positioning boundary lines 3 of standard width are engraved on both ends of the top surface of the upper flange of the I-beam 2.

[0049] In one possible design, Figure 4 As shown, segment beam positioning fixtures 4 are installed on the left and right ends of the I-beam 2. The left and right segment beam positioning fixtures 4 are used to temporarily fix the segment beam from both sides. Figure 5 As shown, the segmental beam positioning fixture 4 includes a flange sleeve 41 adapted to the flange of the I-beam 2 and a limiting plate 42 for laterally limiting the segmental beam. The bottom of the limiting plate 42 is connected to the flange sleeve 41. The flange sleeve 41 has a threaded hole 43, and bolts are inserted to fasten the flange sleeve 41 to the I-beam 2. Optionally, the limiting plate 42 also has a threaded hole 43, and bolts are inserted to fasten the flange sleeve 41 to the segmental beam during use.

[0050] In a possible design, the limiting plate 42 and the flange clamping sleeve 41 are manufactured in one piece. In particular, they can be integrally formed from steel plates.

[0051] like Figure 5 As shown, in a possible design, a guide arc plate 44 is connected to the top of the limit plate 42, and the guide arc plate 44 is used to guide the falling beam. The guide arc plate 44 and the limit plate 42 are manufactured integrally or not.

[0052] In one possible design, Figure 3As shown, the support unit also includes a guide plate 5 for controlling the longitudinal position of the segmental beam when it is hoisted into place. The guide plate 5 is bonded to the segmental beam. Optionally, a thin plastic sheet can be placed between two adjacent segmental beams as the guide plate 5 when the segmental beam is hoisted into place. The guide plate 5 can also prevent the ends of the two segmental beams from colliding.

[0053] The number of support units is reasonably set according to the number of segment beams. Figure 7-Figure 9 As shown, a segmented turnout beam 100 is constructed from seven segmented beams. These seven segmented beams are: first segment 11, second segment 12, third segment 13, fourth segment 14, fifth segment 15, sixth segment 16, and seventh segment 17. Each segment is integrally formed, and a post-tensioning prestressing channel is reserved within each segment. Accordingly, there are seven supporting units and seven pairs of I-beams 2.

[0054] It is worth noting that the segment assembled turnout beam 100 can be a box beam or a track plate beam. Figure 8 、 Figure 9 As shown in the figure, one possible design uses 15m-25m long segmental turnout box girders for plains and hilly areas; specifically, 20m and 25m box girders are used for plains and hilly areas. 5m and 10m track slab girders can be used for mountainous areas and mountaintops for easier transportation.

[0055] The bridge deck of the segmented turnout beam 100 has a concave bridge deck rail groove 101. In a possible design, the top surface of the segmented turnout beam 100 has a pair of main line rail grooves and a pair of side line rail grooves.

[0056] The on-site construction process for segment-assembled turnout beams disclosed in this embodiment includes the following steps:

[0057] S1, construction preparation;

[0058] At the mountain rail construction site, the turnout pier 6 in the station section has been completed, and the inner side of the cross-line has been compacted and hardened, and an assembly platform is being constructed.

[0059] Specifically, a 30m span, approximately 60m long, was selected for compacting and hardening the foundation for the mobile gantry crane's traveling wheels. Seven segmental beams were then constructed on the smooth, hardened ground. Each segmental beam was fixed with a pair of I-beams (2) as support units. Specifically, each I-beam (2) was positioned 0.6m from the end of the segmental beam. Multiple support units were used to sequentially support the segmental beams during assembly.

[0060] S2, laying running rails on a horizontal foundation.

[0061] like Figure 10As shown, in a possible design, the assembly platform covers an area of 25m*10m; the mobile tarpaulin workshop running rails are laid on the ground foundation of the assembly platform with a width of 9.5m. The mobile tarpaulin workshop running rails are 50m long and the shed is 9m wide.

[0062] S3, assembly and debugging of cross-line gantry crane-level mobile tarpaulin workshop.

[0063] S4, 1-7 segment beams are transported to the site in sections. Figure 6 、 Figure 10 As shown, a gantry crane is used to lift the segment beams in sequence 1-7 onto the assembly platform.

[0064] S5, all segment beams 1-7 are hoisted into place and accurately positioned by positioning boundary line 3; and temporarily fixed by segment beam positioning fixture 4.

[0065] S6, move the mobile tarpaulin workshop to the 1-7 segment beams to prepare for work in any weather.

[0066] S7, in the mobile tarpaulin workshop and on the assembly platform, the post-tensioned prestressed steel tendons are threaded through the pipes, tensioned, grouted and anchored. Specifically, the post-tensioned prestressed steel tendons are sequentially threaded through the post-tensioned prestressed ducts of the 1-7 segment beams, the prestressed steel tendons are tensioned and fixed, and grouting and anchoring are performed in the post-tensioned prestressed ducts, thereby assembling multiple segments together longitudinally. Figure 7 shown.

[0067] S8, remove the tarpaulin workshop, hoist the turnout rail assembly onto the bridge deck of the segmented turnout beam 100, and assemble it. After repeated fine-tuning to meet the standards, use temporary fixing cards to fix the turnout in the bridge deck rail groove 101 of the segmented turnout beam 100.

[0068] S9, installation of turnout signal transfer equipment, and initial manual electrical adjustments.

[0069] S10, a bridge support is installed on the turnout pier 6, and a cross-line gantry crane is used to lift the segmented turnout beam 100 onto the pier 6, adjust the bridge support and fix it, and then the cross-line gantry crane is transferred to the site. Figure 11 As shown; Figure 11 The middle one is a segment-assembled turnout box girder, with a span of 20m and a spacing of 10m between piers 6; if it is a segment-assembled turnout track girder, the span is 10m.

[0070] S11, the turnout rails in the bridge deck track groove 101 and the section embedded rails are precisely aligned and glued and fixed.

[0071] S12, install the switch point rail electric control signal equipment and manually adjust the electrical and mechanical equipment into place.

[0072] S13, remove the temporary fixing cards of the turnout section by section, and pour lightweight foamed concrete into the bridge deck track groove 101 section by section. After all the construction is completed, the inside of the point rail section is fine-tuned to meet the standards.

[0073] S14: After all the switch beams, indoor and outdoor signal equipment, and electrical equipment in the station area are completed, power is turned on for electrical and mechanical fine-tuning until they meet the standards.

[0074] S15, construction is completed.

[0075] The above specific implementation methods further illustrate the purpose, technical solutions and beneficial effects of this application in detail. It should be understood that the above are only specific implementation methods of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. The on-site construction process of segmental assembly turnout beams is characterized by: The following steps are involved: A plurality of support units are constructed longitudinally at intervals on a flat and hardened ground foundation, the plurality of support units being used to sequentially support the assembly construction of a plurality of segmental beams, and a post-tensioned prestressing channel is reserved in each segmental beam; Use a gantry crane to hoist each segment beam onto the supporting unit in sequence; After all the segmental beams are hoisted into place, fine-tune the segmental beams and temporarily fix them to the supporting units; The steel bar bundles are punched, tensioned and fixed, and grouting and anchoring are performed to realize the assembly construction of segmental beams; The turnout rail assembly is hoisted onto the bridge deck of the segmented turnout beam and assembled. After fine-tuning to meet the standards, the turnout rail is fixed in the rail groove of the segmented turnout beam using temporary fixing clips; A cross-line gantry crane is used to lift the segmented turnout beams onto the bridge piers; The turnout rails in the rail groove are precisely aligned with the embedded rails in the section and fixed with glue; The temporary fixing cards are removed section by section, and lightweight foamed concrete is poured into the rail groove section by section to lock the turnout rails; The support unit includes at least one pair of I-beams, each having a positioning boundary line adapted to the segmental beam. Positioning boundary lines of standard width are engraved on both ends of the top surface of the upper flange of the I-beam according to the different widths of the segmental beam. Segment beam positioning fixtures are installed on the left and right ends of the I-beam with bolts; after fine-tuning the segment beam, the left and right segment beam positioning fixtures are used to temporarily fix the segment beam; The segment beam positioning and fixing fixture includes a flange sleeve adapted to the flange of the I-beam and a limiting plate for laterally limiting the segment beam. The bottom of the limiting plate is connected to the flange sleeve, and the flange sleeve has a threaded hole.

2. The on-site construction process for segment-assembled turnout beams according to claim 1 is characterized in that: The limit plate may or may not be provided with a threaded hole, and the limit plate and the flange sleeve may or may not be integrally manufactured; The top of the limiting plate is connected or not connected to a guide arc plate for guiding the falling beam, and the guide arc plate and the limiting plate are manufactured integrally or not.

3. The on-site construction process for segment-assembled turnout beams according to claim 1 is characterized in that: When the segment beam is hoisted into place, a guide plate for controlling the longitudinal position is provided between two adjacent segment beams, and the guide plate is bonded and fixed to the segment beam.

4. The on-site construction process for segment-assembled turnout beams according to claim 3 is characterized in that: The guide plate is a plastic thin plate.

5. The on-site construction process for segmented turnout beam assembly according to any one of claims 1 to 4, characterized in that: The segmented turnout beam is formed by splicing 7 segmental beams; On the level hardened ground, corresponding to the positions of the 7 segment beams, a pair of I-beams are fixedly set as supporting units corresponding to each segment beam; The pair of I-beams are located at beam ends of corresponding segment beams and are spaced apart from corresponding beam end surfaces.

6. The on-site construction process for segmented turnout beam assembly according to claim 5, characterized in that: Each I-beam is 0.6 m away from the end face of the corresponding segment beam.

7. The on-site construction process for segmented turnout beam assembly according to any one of claims 1 to 4 and 6, characterized in that: There are running rails on one side of the cross-line, and the mobile tarpaulin workshop runs on the running rails; The mobile tarpaulin workshop can move along the running rails to cover multiple segment beams; The punching, tensioning, fixing, grouting and anchoring operations of the post-tensioned prestressed steel tendons are carried out in the mobile tarpaulin workshop.

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