Steel frame formwork for floating slab, track structure and construction method thereof

Abstract

The present invention provides a steel frame template for a floating plate, a track structure and a construction method thereof. The steel frame template comprises: a base plate (10), a transparent flexible structure (20) abutting against the lower surface of the base plate (10) and extending beyond the base plate on both sides thereof, a base center ditch mold (30) arranged at the center of the lower surface of the transparent flexible structure (20), longitudinal main steel sections (40) arranged on both sides of the upper surface of the base plate, and a plurality of transverse secondary steel sections (50) arranged on the upper surface of the base plate and connecting the longitudinal main steel sections on both sides thereof; a through hole (12) for adjusting the height and inclination of the base plate (10) is provided on the base plate (10) extending beyond the outer edge of the longitudinal main steel sections (40); and a grouting hole and an exhaust hole (13) for grouting and exhaust are provided on the base plate (10).

Description

Technical Field

[0001] The present invention relates to the field of rail transportation, and in particular to a steel frame template for a floating slab, a track structure and a construction method thereof. Background Art

[0002] To facilitate daily commuting, urban rail transit lines often pass through densely populated areas. However, train operation generates a series of vibrations and noise. To protect residents along the line from these disturbances, steel spring floating slab technology (hereinafter referred to as floating slabs, currently the highest-level vibration reduction measure) is often employed in these areas. Steel spring floating slabs are supported by evenly spaced isolators, separating them from the base to provide vibration isolation. Cast-in-place floating slabs require the base concrete to be poured first. After the base is cured, an isolation membrane, ditch covers, and steel cages are laid before the floating slab is cast.

[0003] However, subsequent floating slab construction can only proceed after the base concrete pouring is completed and cured to a certain strength. The floating slab requires the installation of an isolation membrane and gutter covers, and further curing after pouring. This results in a long construction cycle and does not meet the requirements for rapid subway construction. Furthermore, the base concrete upper surface lacks formwork, relying solely on on-site finishing. This can easily lead to gutter dimensional deformation and misalignment of the base, especially on curved sections, making construction quality difficult to guarantee. Both the base and the floating slab require a large amount of steel tying, slowing construction and causing material waste due to steel bar joints.

[0004] Therefore, new technologies and methods are needed to at least partially solve the problems existing in the existing technologies. Summary of the Invention

[0005] In view of the shortcomings and deficiencies in the prior art methods, the present invention provides a steel frame formwork for a floating slab, a steel frame floating slab and a construction method thereof.

[0006] According to one aspect of the present invention, a steel frame formwork for a floating slab is provided, characterized in that it comprises: a base plate (10), a transparent flexible structure (20) abutting against the lower surface of the base plate (10) and extending beyond the base plate on both sides thereof, a base center gutter mold (30) arranged at the center of the lower surface of the transparent flexible structure (20), longitudinal main steel sections (40) arranged on both sides of the upper surface of the base plate, and a plurality of transverse secondary steel sections (50) arranged on the upper surface of the base plate and connecting the longitudinal main steel sections on both sides thereof.

[0007] A through hole (12) for adjusting the height and inclination of the bottom plate (10) is provided on the bottom plate (10) extending beyond the outer edge of the longitudinal main steel section (40); and grouting holes and exhaust holes (13) for grouting and exhaust are provided on the bottom plate (10).

[0008] According to an embodiment of the present invention, an anchoring structure is provided on the substrate central ditch mold (30).

[0009] According to an embodiment of the present invention, the steel frame formwork for floating slabs further comprises an isolator outer cylinder (14), which is located at both ends of the transverse secondary steel (50) and connected to the longitudinal main steel (40).

[0010] According to an embodiment of the present invention, one end of the longitudinal main steel section (40) extends beyond the bottom plate, and the other end is located on the bottom plate and has a certain distance from the edge of the bottom plate.

[0011] According to an embodiment of the present invention, the steel frame mold for a floating slab further comprises a screw support structure (15) disposed in the through hole (12) and a sleeve outside the screw support structure.

[0012] According to another aspect of the present invention, a track structure comprising a floating slab is provided, comprising the steel frame formwork according to the present invention.

[0013] According to another aspect of the present invention, a track structure comprising a floating slab is provided, comprising a base (60) cast by using the steel frame formwork according to the present invention and a floating slab (70).

[0014] According to an embodiment of the present invention, the track structure further comprises a steel rail (80) located on the floating plate, and the longitudinal main steel section (40) is located below the steel rail.

[0015] According to another aspect of the present invention, there is provided a method for constructing a track structure including a floating slab, comprising:

[0016] ① Laying a steel cage for pouring the base (60);

[0017] ② Laying the steel frame template according to the present invention on the steel cage;

[0018] ③ Using the through hole (12) to adjust the height and inclination of the steel frame template;

[0019] ④ Laying floating slab structural reinforcement;

[0020] ⑤ Using self-compacting concrete to cast the base, and observing the concrete casting of the base through a transparent flexible structure (20);

[0021] ⑥ After the base is poured and the concrete is initially set, the concrete floating slab (70) is poured using the steel frame formwork.

[0022] According to an embodiment of the present invention, the through hole (12) is a threaded hole, and step ③ includes setting a screw support structure in the through hole (12), and adjusting the height and inclination of the steel frame template by rotating the screw support structure.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. Solve the cumbersome construction steps of the original cast-in-place steel spring floating slab. The base and floating slab can be cast and maintained at the same time, greatly improving the construction speed.

[0025] 2. An adjustable template is set on the upper surface of the floating slab base to strictly control the geometric shape of the base, avoid deformation of the ditch size, misalignment of the bases on both sides, and improve the construction quality of the floating slab base.

[0026] 3. The original floating slab reinforcement structure was modified, replacing traditional rebar with frame-type steel sections. This reduced the number of steps involved in cutting, bending, tying, and welding rebar. The frame steel structure connects the isolator support points as a single unit, enhancing the overall load-bearing capacity of the floating slab. The longitudinal main steel sections are located directly beneath the rails, directly transmitting train loads and simultaneously supporting more isolators, minimizing dynamic subsidence of the floating slab and improving track smoothness. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the planar structure of a steel frame template according to an embodiment of the present invention;

[0028] Figure 2 A schematic cross-sectional view of a steel frame template according to an embodiment of the present invention;

[0029] Figure 3 A schematic cross-sectional view of the construction of a track structure including a floating slab according to an embodiment of the present invention;

[0030] Figure 4 FIG. 1 is another cross-sectional schematic diagram of the construction of a track structure including a floating slab according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to the accompanying drawings and implementation examples. The contents mentioned are intended to illustrate the principles of the present invention and are not intended to limit the present invention.

[0032] Figure 1 A schematic diagram of the planar structure of a steel frame template according to an embodiment of the present invention; Figure 2 Schematic diagram of the cross-sectional structure of the steel frame template according to the embodiment of the present invention. Figure 1 and 2The steel frame formwork for a floating slab according to the embodiment may include: a base plate 10, a transparent flexible structure 20 abutting against the lower surface of the base plate 10 and extending beyond the base plate on both sides; a base center gutter mold 30 disposed at the center of the lower surface of the transparent flexible structure 20; longitudinal main steel sections 40 disposed on both sides of the upper surface of the base plate; and a plurality of transverse secondary steel sections 50 disposed on the upper surface of the base plate connecting the longitudinal main steel sections on both sides. Vibration isolator holes 11 for isolators are provided in the base plate 10 at both ends of the transverse secondary steel sections 50; through holes 12 for adjusting the height and inclination of the base plate 10 are provided in the base plate 10 between the vibration isolator holes 11 on each side; and grouting holes and exhaust holes 13 for grouting and exhaust are provided in the base plate 10.

[0033] It should be understood that, in the present invention, the longitudinal direction refers to the length direction of the bottom plate 10 , and the transverse direction refers to the width direction of the bottom plate 10 .

[0034] The bottom plate 10 of the steel frame formwork is a rigid structure, for example, it can be a thin steel plate, which can be used as a base 60 and a shared formwork with the floating plate 70 (see below). The bottom plate 10 serves as the formwork on the top of the base, controlling the flatness of the upper surface of the base, especially in curved sections, which can better control the superelevation of the base. It should be understood that the longitudinal edge of the bottom plate 10 can be substantially flush with the outer edge of the longitudinal main steel 40, and the through hole 12 exists as a part extending from the bottom plate. In this case, it is not necessary to form the vibration isolator hole 11, and the vibration isolator outer cylinder 14 can be directly provided on the transparent flexible structure 20 later (see attached). Figure 4 ); or the width of the bottom plate 10 can be larger, exceeding the outer edge of the longitudinal main steel section 40. In this case, vibration isolator holes 11 for vibration isolators can be provided on the bottom plates at both ends of the transverse secondary steel section 50, and the through holes 12 are provided on the bottom plate 10 between the vibration isolator holes 11 on each side.

[0035] A thin layer of transparent flexible structure 20, such as a flexible sheet or film, is attached to the lower portion of the rigid baseplate structure. The transparent flexible structure 20 extends laterally beyond the baseplate 10. The flexible structure can be made of materials such as PVC, PE, and PMMA. The flexible structure can adapt to different track heights and tunnel shapes. When encountering a tunnel wall, the flexible structure bends along it and adheres closely to it. The flexible structure also serves as a separator between the floating slab and the baseplate. Furthermore, during the pouring of the baseplate concrete, the compaction of the concrete can be observed through the transparent flexible structures on both sides, facilitating construction.

[0036] The base center gutter mold 30 is fixed below the rigid structure, that is, it can be set on the lower surface of the transparent flexible structure 20. An anchoring structure can also be provided on the center gutter mold 30. The anchoring structure generates an anchoring force after the base concrete is poured. When the floating slab is lifted, the base center gutter mold will be separated from the rigid structure and connected to the base as a whole.

[0037] The longitudinal main steel section 40 can replace most of the longitudinal stress-bearing reinforcement bars required for the original ordinary floating slab, and the main steel section can be set under the rail 80 to evenly distribute the train load. The transverse secondary steel section 50 can replace most of the transverse stress-bearing reinforcement bars required for the original ordinary floating slab, connect the vibration isolators on the left and right sides, and connect to the main steel section to form a stable frame stress-bearing structure. This frame stress-bearing structure can directly transmit the train load, so that more vibration isolators are stressed at the same time, maintaining stability, and can reduce the demand for floating slab structural reinforcement. In addition, the longitudinal main steel section can be a full-length conductor, which can replace the longitudinal reinforcement as a stray current collection system. As shown in the figure, one end of the longitudinal main steel section 40 can extend outward, and a notch is reserved at the other end to connect with the adjacent plate notch / extending structure.

[0038] The isolator outer tube 14 can be pre-fixed to the outside of the longitudinal main steel 40 at a position corresponding to the transverse secondary steel 50 as part of the steel frame template, or fixed when the floating slab is cast. The isolator outer tube 14 is used for subsequent installation of the isolator.

[0039] Through holes 12 can be evenly arranged between the vibration isolators on both sides of the bottom plate 10. For example, the through holes 12 can be threaded holes. Screw support structures 15 (see attached) are installed in the threaded holes. Figure 3 During construction, the inclination of the formwork (base plate) can be adjusted by rotating the screw to accommodate the superelevation of the curved line. A sleeve can be installed outside the screw support structure, and the screw support structure can be removed after the concrete pouring is completed.

[0040] In addition, grouting holes and vent holes 13 for grouting and exhaust are provided on the base plate 10. As shown in the figure, the grouting hole and vent hole 13 are set at the center of the base plate, passing through the base center ditch mold 30. Of course, they can also be set in other parts of the base plate as long as the base can be poured through the grouting hole and vent hole 13.

[0041] The steel frame template of the present invention can be made into different lengths according to the hoisting capacity and the size of the feed opening. As the template at the bottom of the floating slab, the steel frame template does not need to be removed and can be cast into an integral structure with the floating slab.

[0042] Figure 3 A schematic cross-sectional view of the construction of a track structure including a floating slab according to an embodiment of the present invention; Figure 4This is another cross-sectional schematic diagram of the construction of a track structure including a floating plate according to an embodiment of the present invention. The following further illustrates how to use the steel frame formwork of the present invention for construction to realize the track structure including a floating plate of the present invention, in conjunction with the accompanying drawings:

[0043] ① Base reinforcement binding, that is, setting up a steel cage for pouring the base;

[0044] ② Laying the steel frame template of the present invention on the steel cage;

[0045] ③ Adjust the height and inclination of the steel frame template by rotating the screw support structure 15 in the steel frame template;

[0046] ④ Laying floating slab structural reinforcement. Since the steel frame template of the present invention has a certain frame structure, a small amount of structural reinforcement can be set;

[0047] ⑤ The grouting pipe and exhaust pipe are respectively inserted into the grouting hole and the exhaust hole 13, and the self-compacting concrete is poured through the grouting pipe and exhausted through the exhaust pipe. The concrete pouring condition of the base can be observed through the transparent flexible structure;

[0048] ⑥ After the base 60 is poured and the concrete has initially set, the floating slab 70 concrete can be poured.

[0049] The concrete of the base and floating slab can be cured simultaneously. Subsequent procedures are the same as those for ordinary steel spring floating slabs, such as installing sealing strips and other accessories, and installing the inner tube of the vibration isolator.

[0050] Although the present invention has been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned embodiments. Any professional and technical personnel familiar with the field can make some changes or modifications using the technical contents disclosed above without departing from the purpose of the present invention, which are all within the protection of the present invention.

Claims

1. A steel frame formwork for a floating slab, characterized in that: include: A bottom plate (10), a transparent flexible structure (20) abutting against the lower surface of the bottom plate (10) and extending beyond the bottom plate on both sides thereof, a base center water ditch mold (30) arranged at the center of the lower surface of the transparent flexible structure (20), longitudinal main steel sections (40) arranged on both sides of the upper surface of the bottom plate, and a plurality of transverse secondary steel sections (50) arranged on the upper surface of the bottom plate and connecting the longitudinal main steel sections on both sides thereof. A through hole (12) for adjusting the height and inclination of the bottom plate (10) is provided on the bottom plate (10) extending beyond the outer edge of the longitudinal main steel section (40); and grouting holes and exhaust holes (13) for grouting and exhaust are provided on the bottom plate (10).

2. The steel frame formwork for floating slab according to claim 1, characterized in that: An anchoring structure is provided on the base center water ditch mold (30).

3. The steel frame formwork for floating slab according to claim 1, characterized in that: It also includes a vibration isolator outer cylinder (14), which is located at both ends of the transverse secondary steel section (50) and is connected to the longitudinal main steel section (40).

4. The steel frame formwork for floating slab according to claim 1, characterized in that: One end of the longitudinal main steel section (40) extends beyond the bottom plate, and the other end is located on the bottom plate and has a certain distance from the edge of the bottom plate.

5. The steel frame formwork for floating slab according to claim 1, characterized in that: The invention also comprises a screw support structure (15) arranged in the through hole (12) and a sleeve outside the screw support structure.

6. A track structure comprising a floating plate, characterized in that: It comprises the steel frame formwork according to any one of claims 1-5.

7. A track structure comprising a floating plate, characterized in that: The invention comprises a base (60) and a floating slab (70) cast by using the steel frame formwork according to any one of claims 1 to 5.

8. The track structure according to claim 6 or 7, wherein: The invention also comprises a steel rail (80) located on the floating plate, and a longitudinal main steel section (40) is located below the steel rail.

9. A construction method for a track structure comprising a floating slab, characterized in that: include: ① Laying a steel cage for pouring the base (60); ② Laying the steel frame formwork according to any one of claims 1 to 5 on the steel cage; ③ Using the through hole (12) to adjust the height and inclination of the steel frame template; ④ Laying floating slab structural reinforcement; ⑤ Using self-compacting concrete to cast the base, and observing the concrete casting of the base through the transparent flexible structure (20); ⑥ After the base is poured and the concrete is initially set, the concrete floating slab (70) is poured using the steel frame formwork.

10. The method according to claim 9, characterized in that The through hole (12) is a threaded hole. Step ③ includes setting a screw support structure in the through hole (12) and adjusting the height and inclination of the steel frame template by rotating the screw support structure.

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