A construction method of shear hinge design of prefabricated steel spring floating slab track

Abstract

The present application relates to the field of floating slab track technology, and particularly relates to a shear hinge design construction method of a prefabricated steel spring floating slab track, which comprises the following steps: during the installation of the shear hinge: when the shear hinge is located in a straight line and a circular curve section, a flat pad is arranged between the shear plate and the surface of the prefabricated floating slab; when the shear hinge is located in a transition curve section, a corresponding specification of height-adjusting pad and wedge-shaped pad are arranged according to the height difference on one side of the adjacent prefabricated floating slab, the height-adjusting pad and the wedge-shaped pad are arranged between the shear plate and the surface of the prefabricated floating slab on the corresponding side, and the height-adjusting pad is arranged above the wedge-shaped pad; after the flat pad, the wedge-shaped pad and the height-adjusting pad are installed, the shear hinge and the prefabricated floating slab are connected and fixed. The present application has the advantages that the installation requirements of the shear hinge in different sections are met, the adjustment of the shear hinge in different sections is facilitated, and the construction efficiency and the construction quality are improved.

Description

Technical Field

[0001] This invention relates to the field of floating slab track technology, and in particular to a shear hinge design and construction method for prefabricated steel spring floating slab tracks. Background Technology

[0002] Existing floating slab track beds generally use top-mounted shear hinges as the connection device between adjacent floating slabs. This device is located above the track slab and is fixed to the concrete at both ends by anchor bolts, which can accommodate relative displacement along the longitudinal direction of the rail to a certain extent. However, its "one-time casting, one-time shaping" installation method has a fundamental contradiction with the dynamic changes in the actual geometric conditions of the track, especially in the adjustment problems of straight, circular curve, and transition curve sections.

[0003] In common shear hinges, the anchor bolts are permanently embedded in the slab after concrete pouring, leaving no room for on-site adjustment of their planar position and height. Once pouring is complete, even minor misalignment of the holes cannot be corrected by adjusting the bolt position. Forcibly tightening the bolts will generate assembly stress within the hinge structure, creating a potential for fatigue fracture later. Furthermore, with the design of subway lines, the types of sections are constantly changing—from straight sections to curved sections and transitional curves. How to adapt the top-mounted shear hinge to these changes is a pressing technical problem that needs to be solved. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the prior art by providing a design and construction method for a shear hinge of a precast steel spring floating slab track. An adjustment structure for different sections is set below the shear plate of the shear hinge, allowing the shear hinge to easily adapt to the requirements of different sections and to be easily adjusted.

[0005] The objective of this invention is achieved through the following technical solutions: A shear hinge design and construction method for a precast steel spring floating slab track, comprising a shear hinge spanning between adjacent precast floating slabs, characterized in that: the construction method includes: During the installation of the shear hinge: When the shear hinge is located in a straight or circular curve section, the flat pad is provided between the surface of the shear plate and the surface of the prefabricated floating slab. When the shear hinge is located in a transition curve section, the height adjustment pad and the wedge-shaped pad of the corresponding specifications are set according to the superelevation difference of the adjacent precast floating slab. The height adjustment pad and the wedge-shaped pad are set between the surface of the shear plate and the surface of the precast floating slab on the corresponding side, wherein the height adjustment pad is set on the wedge-shaped pad. After installing the flat pad, the wedge pad, and the height adjustment pad, the shear hinge and the prefabricated floating plate are connected and fixed.

[0006] During the prefabrication of the precast floating slab, a sleeve is embedded inside it, and bolt holes matching the sleeve are opened on the shear plate of the shear hinge. The bolt holes correspond to the positions of the sleeve. The connection between the shear plate and the precast floating slab is achieved by screwing in the bolt holes and the screws inside the sleeve. The screws are locked and fixed by nuts.

[0007] The flat pad, wedge pad, and height adjustment pad are prefabricated in modular specifications. When the shear hinge is located in a transition curve section, its superelevation difference is compensated by stacking the height adjustment pad and wedge pad.

[0008] The wedge-shaped pad is provided in one layer, and the height adjustment pad is provided in one or more layers.

[0009] The flat pad, the height adjustment pad, and the wedge-shaped pad are each provided with mounting holes that match the bolt holes, and each pad is fixed by the cooperation of the screw and the nut.

[0010] The flat pad and the wedge-shaped pad are elastic buffer pads.

[0011] The height adjustment pad is a rigid steel pad.

[0012] The bolt holes on one side of the shear plate are longitudinal elongated oval holes, and the bolt holes on the other side are transverse elongated oval holes.

[0013] The shear plate is provided with a plurality of bolt holes arranged in an array.

[0014] The advantages of this invention are: it meets the installation requirements of shear hinges in different locations, facilitates the adjustment of shear hinges according to different locations, and improves construction efficiency and quality; it has low construction difficulty, leaves sufficient margin for on-site construction, and adapts to various working conditions; and it has sufficient strength, stability, and durability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall installation structure of the present invention; Figure 2 This is an installation plan view of the present invention; Figure 3 for Figure 2 AA section view (when in straight and circular curve sections); Figure 4 for Figure 2 AA profile (when in a transition curve section); Figure 5 for Figure 2 BB profile (when in straight and circular curve sections); Figure 6 for Figure 2 BB profile (when in the transition curve section). Detailed Implementation

[0016] The features and other related features of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate understanding by those skilled in the art: like Figure 1-6 As shown in the figure, each of the markings represents: 1. Precast floating slab, 2. Shear hinge, 3. Precast floating slab, 4. Shear plate, 5. Longitudinal long oval bolt hole, 6. Transverse long oval bolt hole, 7. Flat washer, 8. Sleeve, 9. Screw, 10. Flat washer, 11. Anti-loosening double nut, 12. Height adjustment shim, 13. Wedge shim.

[0017] Example: Figures 1 to 6 As shown, the shear hinge design and construction method for the precast steel spring floating slab track in this embodiment is used for the design and installation of shear hinges. These shear hinges are used to coordinate the deformation of adjacent precast floating slabs. Shear hinges 2 are installed at the joint positions of adjacent precast floating slabs along the track direction. In this embodiment, using... Figure 1 Taking this example, precast floating slab 1 and precast floating slab 3 are two adjacent precast floating slabs. A shear hinge 2 is positioned between precast floating slab 1 and precast floating slab 3, with one part connected to precast floating slab 1 and the other part connected to precast floating slab 3. This shear hinge 2 is an upper-mounted flat plate type shear hinge, positioned above the precast floating slab. In this embodiment, two sets of shear hinges 2 are provided at each slab joint location. The two sets of shear hinges 2 are symmetrically arranged along the longitudinal direction of the track on both sides of the slab joint and located outside the rail. Figure 1 The structure shown is only the shear hinge 2 structure on one side; the shear hinge 2 structure on the other side, which is not shown, is the same.

[0018] like Figure 2 As shown, the shear hinge 2 in this embodiment includes a shear plate 4, which is the main body of the shear hinge 2. Six longitudinally arranged elongated oval bolt holes 5 are provided on one side, and six transversely arranged elongated oval bolt holes 6 are provided on the other side. The two sets of bolt holes on both sides are symmetrically arranged along the transverse centerline of the shear plate 4. Figure 3 As shown, several sleeves 8 are pre-embedded in the precast floating slab, and the number and position of the sleeves 8 correspond one-to-one with the longitudinal elongated oval bolt holes 5 and the transverse elongated oval bolt holes 6.

[0019] In this embodiment, longitudinal elongated oval bolt holes 5 and transverse elongated oval bolt holes 6 are provided to accommodate the lateral and longitudinal construction deviations of the precast floating slab. The longitudinal elongated oval bolt holes 5 are used to accommodate the longitudinal construction deviations of the precast floating slab, while the transverse elongated oval bolt holes 6 are used to accommodate the lateral construction deviations of the precast floating slab. The spacing between each bolt hole and the distance between the bolt holes and the edge of the shear plate 4 both meet the requirements for bolt hole spacing.

[0020] When the shear plate 4 is placed above the precast floating slab, each longitudinal elongated oval bolt hole 5 and each transverse elongated oval bolt hole 6 is aligned with a sleeve 8. A screw 9 is passed through the bolt hole from above and screwed into the tube hole of the sleeve 8. Then, a flat washer 10 is fitted onto the part of the screw 9 that extends out of the surface of the shear plate 4 and the anti-loosening double nut 11 is tightened to fix the screw 9, thereby connecting and fixing the shear plate 4 to the precast floating slab.

[0021] like Figure 3 or Figure 4 As shown, in this embodiment, the sleeve 8 is embedded in the concrete along with the precast floating slab. The sleeve 8 is made of 45# steel or Q355C steel with a strength grade of not less than 8. An internal thread matching the external thread of the screw 9 is provided on the inner wall of the sleeve 8's bore. The inside of the sleeve 8 is coated with oil and protected with a sealing cap. When applying oil, a brush or similar tool should be used to evenly apply lithium-based grease to the surface of the internal thread, and anti-corrosion treatment should be performed before oiling. The anti-loosening double nut 11 is made of 45# steel with a strength grade of not less than 8.

[0022] In this embodiment, to adapt the shear hinge 2 to the requirements of different locations, different methods are adopted according to different locations: 1) Straight lines and curved sections: Combination Figure 3 and Figure 5 As shown, a flat pad 7 is provided between the shear plate 4 and the precast floating slab as a buffer pad. The flat pad 7 is made of pressure-resistant hard rubber material and has a stiffness of 500-700KN / mm.

[0023] 2) Transition curve sections: Combination Figure 4 and Figure 6 As shown, in the transition curve section, based on the superelevation difference between the two precast floating slabs, wedge-shaped pads 13 and height-adjusting pads 12 are provided as buffer pads between the shear plate 4 and the precast floating slab on one side, with the height-adjusting pads 12 located above the wedge-shaped pads 13. In this embodiment, a maximum of one layer of wedge-shaped pads 13, not exceeding 10mm, is provided under the shear plate 4, and the remaining height difference is resolved by adding height-adjusting pads 12. A flat pad 7 is used on the other side of the transition curve section.

[0024] In this embodiment, the flat pad 7 is available in two thicknesses: 5mm and 6mm. The wedge-shaped pad 13 is available in three thicknesses: 5-6mm, 5-7mm, and 5-8mm. Taking the 5-6mm thickness as an example, the lower end of the wedge-shaped pad 13 is 5mm thick, and the upper end is 6mm thick, with a uniform thickness variation between the lower and upper ends. The height adjustment pad 12 is made of Q355C material and is available in four thicknesses: 2mm, 3mm, 5mm, and 9mm. The height adjustment pad 12 undergoes galvanizing for corrosion protection.

[0025] In this embodiment, depending on the conditions of different locations, buffer plates or leveling plates are installed between the concrete of the shear hinge 2 and the precast floating slab during installation. The height is adjusted in a modular, layered manner, allowing the shear hinge 2 to adapt to various terrains. During layering, up to two layers of height-adjusting plates 12 can be installed, while only one layer of buffer plates is installed. The shear hinge 2 is installed after the precast floating slab has been lifted and leveled into place, ensuring that the planar and elevation deviations between the two precast floating slabs meet relevant design requirements.

[0026] In this embodiment, when the precast floating slab needs to be lifted and adjusted after the shear hinge 2 is installed, the shear hinge 2 is removed first, and each pad is reconfigured according to the height difference between the slabs during reinstallation.

[0027] Although the above embodiments have described the concept and embodiments of the present invention in detail with reference to the accompanying drawings, those skilled in the art will recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, and therefore will not be elaborated here.

Claims

1. A method for designing and constructing a shear hinge for a precast steel spring floating slab track, comprising a shear hinge spanning between adjacent precast floating slabs, characterized in that: The construction method includes: During the installation of the shear hinge: When the shear hinge is located in a straight or circular curve section, the flat pad is provided between the surface of the shear plate and the surface of the prefabricated floating slab. When the shear hinge is located in a transition curve section, the height adjustment pad and the wedge-shaped pad of the corresponding specifications are set according to the superelevation difference of the adjacent precast floating slab. The height adjustment pad and the wedge-shaped pad are set between the surface of the shear plate and the surface of the precast floating slab on the corresponding side, wherein the height adjustment pad is set on the wedge-shaped pad. After installing the flat pad, the wedge pad, and the height adjustment pad, the shear hinge and the prefabricated floating plate are connected and fixed.

2. The shear hinge design and construction method for a precast steel spring floating slab track according to claim 1, characterized in that: During the prefabrication of the precast floating slab, a sleeve is embedded inside it, and bolt holes matching the sleeve are opened on the shear plate of the shear hinge. The bolt holes correspond to the positions of the sleeve. The connection between the shear plate and the precast floating slab is achieved by screwing in the bolt holes and the screws inside the sleeve. The screws are locked and fixed by nuts.

3. The shear hinge design and construction method for a precast steel spring floating slab track according to claim 1, characterized in that: The flat pad, wedge pad, and height adjustment pad are prefabricated in modular specifications. When the shear hinge is located in a transition curve section, its superelevation difference is compensated by stacking the height adjustment pad and wedge pad.

4. The shear hinge design and construction method for a precast steel spring floating slab track according to claim 3, characterized in that: The wedge-shaped pad is provided in one layer, and the height adjustment pad is provided in one or more layers.

5. The shear hinge design and construction method for a precast steel spring floating slab track according to claim 1, characterized in that: The flat pad, the height adjustment pad, and the wedge-shaped pad are each provided with mounting holes that match the bolt holes, and each pad is fixed by the cooperation of the screw and the nut.

6. The shear hinge design and construction method for a precast steel spring floating slab track according to claim 1, characterized in that: The flat pad and the wedge-shaped pad are elastic buffer pads.

7. The shear hinge design and construction method for a precast steel spring floating slab track according to claim 1, characterized in that: The height adjustment pad is a rigid steel pad.

8. The shear hinge design and construction method for a precast steel spring floating slab track according to claim 1, characterized in that: The bolt holes on one side of the shear plate are longitudinal elongated oval holes, and the bolt holes on the other side are transverse elongated oval holes.

9. The shear hinge design and construction method for a precast steel spring floating slab track according to claim 1, characterized in that: The shear plate is provided with a plurality of bolt holes arranged in an array.

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