A lead plate structure with a T-shaped load transfer bar and a construction method thereof

Abstract

The present invention provides a lead plate structure with a T-shaped load transfer bar and a construction method, which includes a first lead plate and a second lead plate located between the main beam and the connecting road surface. The joints of the first lead plate and the second lead plate are connected by a T-shaped load transfer bar. One end of the T-shaped load transfer bar is anchored on the first lead plate, and the other end is anchored on the second lead plate. The T-shaped load transfer bar includes a steel bar, and a round steel plate is fixedly connected to one end of the steel bar. A micro-motion structure is installed on the steel bar at one end of the round steel plate. The present invention can prevent uneven settlement through the T-shaped load transfer bar and transfer the longitudinal tensile displacement generated when the temperature drops to all lead plates, so that gaps appear between all lead plates and the expansion joint plate. However, the width of the gaps is less than the gap width limit that will cause cracks in the asphalt pavement, avoiding the problem that the gap width between the first lead plate and the first expansion joint plate exceeds the gap width limit that will cause cracks in the asphalt pavement.

Description

Technical Field

[0001] The present invention relates to a guide plate structure with a T-shaped load transfer bar and a construction method thereof. Background Art

[0002] For a bridge without expansion joints (hereinafter referred to as a seamless bridge), connecting steel bars are provided to connect the bridge and the guide plate. In a seamless bridge, multiple guide plates (multi-section guide plates) and multiple expansion joint plates are often arranged in series along the longitudinal direction of the bridge to absorb the longitudinal displacement transmitted from the bridge. Conventionally, traditional load transfer bars are arranged between the multi-section guide plates to prevent uneven settlement. Engineering practice has found that the cracks in the asphalt pavement with multi-section guide plates mainly appear at the position between the first guide plate and the first expansion joint plate. This is because the traditional load transfer bars cannot transmit the longitudinal tensile displacement. When the temperature drops and the main girder shrinks, the first guide plate near the bridge is in tension, and the longitudinal tensile displacement cannot be transmitted to the second guide plate. The gap width between the first guide plate and the first expansion joint plate is greater than the limit value of the gap width that will cause cracks in the asphalt pavement, resulting in cracks in the asphalt pavement. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to propose a guide plate structure with a T-shaped load transfer bar and a construction method thereof, so as to solve the problem that the gap width between the first guide plate and the first expansion joint plate exceeds the limit value of the gap width that will cause cracks in the asphalt pavement.

[0004] The present invention is implemented as follows: A guide plate structure with a T-shaped load transfer bar includes a first guide plate and a second guide plate located between the main girder and the connecting road surface. The joints of the first guide plate and the second guide plate are connected by a T-shaped load transfer bar. One end of the T-shaped load transfer bar is anchored on the first guide plate, and the other end is anchored on the second guide plate. The T-shaped load transfer bar includes a steel bar, and a round steel plate is fixedly connected to one end of the steel bar. A micro-motion structure is installed on the steel bar at one end of the round steel plate.

[0005] Further, the micro-motion structure includes a box body. The round steel plate is sleeved in the box body. Foam debris is filled between the side of the round steel plate away from the steel bar and the inner wall of the box body, and a rubber ring is filled between the side of the round steel plate close to the steel bar and the inner wall of the box body.

[0006] Further, the box body includes a plastic tube box. The plastic tube box is sleeved on the round steel plate. A plastic tube cover is sleeved at the connection of the steel bar and the round steel plate. One end of the plastic tube cover is sleeved outside the plastic tube box, and the other end is sleeved on the steel bar. The plastic tube box is coated with a metal sleeve, and the metal sleeve is sleeved on the end of the plastic tube cover outside the plastic tube box.

[0007] Further, putty filler is applied on the inner wall surfaces of the plastic tube box and the plastic tube cover to fill the gaps. Asphalt is applied on the surface of the middle section of the steel bar at the joints corresponding to the first guide plate and the second guide plate, and polyethylene film is wrapped to prevent corrosion.

[0008] Furthermore, both the first guiding slab and the second guiding slab are formed by concrete casting. A No. 1 expansion joint board is clamped at the joint of the first guiding slab and the second guiding slab. A No. 2 expansion joint board is clamped between the second guiding slab and the connecting road surface. The first guiding slab is fixedly connected to the main beam through connecting steel bars.

[0009] Furthermore, a sliding material layer is laid below the first guiding slab, the second guiding slab, the No. 1 expansion joint board and the No. 2 expansion joint board. Behind the abutment filling soil after compaction is below the connecting road surface and the sliding material layer.

[0010] A construction method for a guiding slab structure with T-shaped load transfer bars:

[0011] (1) Precast T-shaped load transfer bars: Apply putty filler on the inner wall of the plastic tube box, then fill foam debris into it. Weld the round steel plate to the steel bar, put the steel bar and the round steel plate into the plastic tube box, place the round steel plate on the foam debris, install the rubber ring into the plastic tube box and place it on the round steel plate. Apply putty filler on the inner wall of the plastic tube cover and then cover it on the plastic tube box to seal it. Put the metal sleeve on the plastic tube box and the plastic tube cover to fix it. Apply asphalt on the middle section surface of the steel bar and wrap it with a polyethylene film to isolate corrosion.

[0012] (2) Pass the fabricated T-shaped load transfer bars through the No. 1 expansion joint board, and perform vertical support and positioning through brackets. Then place them on the behind the abutment filling soil where the sliding material layer has been pre-laid. Then pour the first guiding slab and the second guiding slab at both ends of the T-shaped load transfer bars respectively. The first guiding slab is cast and fixedly connected to the main beam through pre-set connecting steel bars. A No. 2 expansion joint board is pre-clamped between the second guiding slab and the connecting road surface.

[0013] Compared with the prior art, the present invention has the following beneficial effects: Through the T-shaped load transfer bars, uneven settlement can be prevented and the longitudinal bridge direction tensile displacement generated when the temperature drops can be transferred to all the guiding slabs, so that gaps appear between all the guiding slabs and the expansion joint boards. However, the width of the gaps is less than the gap width limit value that will cause cracks in the asphalt pavement, avoiding the problem that the gap width between the first guiding slab and the first expansion joint board exceeds the gap width limit value that will cause cracks in the asphalt pavement. In the specific implementation process, if the gap width does not meet the requirements, it can be solved by serially adding guiding slabs with T-shaped load transfer bars along the longitudinal bridge direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic structural diagram of an embodiment of the present invention;

[0015] Figure 2 Front view of the T-shaped load transfer bar in the embodiment of the present invention;

[0016] Figure 3 Construction step 1 of the embodiment of the present invention;

[0017] Figure 4 Step 2 of the construction steps of the embodiment of the present invention;

[0018] Figure 5 Step 3 of the construction steps of the embodiment of the present invention;

[0019] Figure 6 Step 4 of the construction steps of the embodiment of the present invention;

[0020] Figure 7 Step 5 of the construction steps of the embodiment of the present invention;

[0021] Figure 8 Step 6 of the construction steps of the embodiment of the present invention;

[0022] Figure 9 Step 7 of the construction steps of the embodiment of the present invention;

[0023] Figure 10 Step 8 of the construction steps of the embodiment of the present invention;

[0024] Figure 11 Step 9 of the construction steps of the embodiment of the present invention.

[0025] In the figure: 1 - First guide plate; 2 - Second guide plate; 3 - No. 1 expansion joint board; 4 - T-shaped load transfer bar; 5 - No. 2 expansion joint board; 6 - Connecting road surface; 7 - Connecting steel bar; 8 - Main beam; 9 - Sliding material layer; 10 - Backfill behind abutment; 11 - Steel rod; 12 - Round steel plate; 13 - Rubber ring; 14 - Foam debris; 15 - Putty filler; 16 - Plastic cylinder cover; 17 - Plastic cylinder box; 18 - Metal sleeve; 19 - Asphalt; 20 - Polyethylene film; 21 - Bracket. Specific embodiments

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0029] As Figure 1-2As shown in the figure, this embodiment provides a guide plate structure with a T-shaped load transfer bar, which includes a first guide plate 1 and a second guide plate 2 located between the main beam 8 and the connecting road surface 6. The joint of the first guide plate and the second guide plate is connected by a T-shaped load transfer bar 4. One end of the T-shaped load transfer bar is anchored on the first guide plate, and the other end is anchored on the second guide plate. The T-shaped load transfer bar includes a steel bar 11, and a circular steel plate 12 is fixedly connected to one end of the steel bar. A micro-motion structure is installed on the steel bar at one end of the circular steel plate.

[0030] In this embodiment, the micro-motion structure includes a box body. The circular steel plate is sleeved in the box body. Foam debris 14 is filled between the side of the circular steel plate away from the steel bar and the inner wall of the box body, and a rubber ring 13 is filled between the side of the circular steel plate close to the steel bar and the inner wall of the box body.

[0031] In this embodiment, the box body includes a plastic tube box 17. The plastic tube box is sleeved on the circular steel plate. A plastic tube cover 16 is sleeved at the connection of the steel bar and the circular steel plate. One end of the plastic tube cover is sleeved outside the plastic tube box, and the other end is sleeved on the steel bar. The plastic tube box is wrapped with a metal sleeve 18, and the metal sleeve is sleeved on the end of the plastic tube cover outside the plastic tube box.

[0032] In this embodiment, putty filler 15 is smeared on the inner wall surfaces of the plastic tube box and the plastic tube cover to fill the gaps. Asphalt 19 is smeared on the surface of the middle section of the steel bar at the joint of the first guide plate and the second guide plate, and a polyethylene film 20 is wrapped to prevent corrosion.

[0033] In this embodiment, both the first guide plate and the second guide plate are formed by concrete pouring. A first expansion joint board 3 is clamped at the joint of the first guide plate and the second guide plate, a second expansion joint board 5 is clamped between the second guide plate and the connecting road surface, and the first guide plate is fixedly connected to the main beam through a connecting steel bar 7.

[0034] In this embodiment, a sliding material layer 9 is laid under the first guide plate, the second guide plate, the first expansion joint board and the second expansion joint board to allow the first guide plate, the second guide plate, the first expansion joint board and the second expansion joint board to slide along the longitudinal bridge direction. Behind the abutment fill 10 is compacted under the connecting road surface and the sliding material layer.

[0035] Construction method of a guide plate structure with a T-shaped load transfer bar:

[0036] (1) Precast the T-shaped load transfer bar: As Figure 3 , after smearing putty filler on the inner wall of the plastic tube box, fill the foam debris into it. As Figure 4 , weld the circular steel plate to the steel bar, put the steel bar and the circular steel plate into the plastic tube box, and place the circular steel plate on the foam debris. As Figure 5 , install the rubber ring into the plastic tube box and place it on the circular steel plate. As Figure 6, apply putty filler on the inner wall of the plastic barrel cover and then cover it on the plastic barrel box to seal it, as Figure 7 , put the metal sleeve on the plastic barrel box and the plastic barrel cover to fix them, as Figure 8 , apply asphalt on the surface of the middle section of the steel bar and wrap it with a polyethylene film to isolate corrosion;

[0037] (2) As Figure 9 , pass the fabricated T-shaped load transfer bar through the first expansion joint board, and perform vertical support and positioning through the support 21, and then place it on the backfill soil behind the platform where the sliding material layer has been pre-laid, as Figure 10-11 , then pour the first guide plate and the second guide plate at both ends of the T-shaped load transfer bar respectively. The first guide plate is cast and fixedly connected with the main beam through the pre-set connecting steel bars. A second expansion joint board is pre-clamped between the second guide plate and the connecting road surface.

[0038] In the present invention, by arranging a T-shaped load transfer bar at the expansion joint board, when the temperature drops, the longitudinal tensile displacement transmitted by the bridge to the guide plate is distributed between all the guide plates and the expansion joint, so that the gap width generated between each guide plate and the expansion joint is less than the gap width limit that will cause cracks in the asphalt pavement. The T-shaped load transfer bar is composed of a steel bar and a round steel plate. A rubber ring is arranged on one side of the round steel plate close to the steel bar, and foam debris is arranged on the other side. Apply putty filler on the outer sides of a section of the steel bar, the round steel plate, the rubber ring and the foam debris close to the round steel plate to fill the gaps, and then wrap it with a plastic barrel cover, a plastic barrel box and a metal sleeve. Apply asphalt on the surface of the middle section of the steel bar and wrap it with a polyethylene film to prevent corrosion. A section of the steel bar far from the round steel plate is anchored in the concrete of the previous guide plate. A section of the steel bar, the plastic barrel cover and the metal sleeve close to the round steel plate are anchored in the concrete of the next guide plate. The T-shaped load transfer bar can prevent uneven settlement. The T-shaped load transfer bar can transmit the longitudinal tensile displacement. Taking the two-section guide plate as an example, when the temperature drops, the first guide plate close to the main beam is in tension, and the round steel plate of the T-shaped load transfer bar compresses the rubber ring. After the rubber ring reaches the compression limit, the second guide plate can be pulled. Gaps appear between the first guide plate and the first expansion joint board and between the second guide plate and the second expansion joint board, but the gap width is less than the gap width limit that will cause cracks in the asphalt pavement. If the gap width does not meet the requirements, it can be solved by serially adding guide plates with T-shaped load transfer bars along the longitudinal bridge direction. The T-shaped load transfer bar does not transmit the longitudinal compressive displacement. When the temperature rises, the first guide plate close to the main beam is in compression, and the longitudinal compressive displacement is transmitted to the first expansion joint board, causing the first expansion joint board to undergo compressive deformation; after the first expansion joint board reaches the compression limit, the longitudinal displacement is transmitted to the second guide plate and the second expansion joint board.

[0039] For any of the technical solutions disclosed in the present invention as described above, unless otherwise stated, if a numerical range is disclosed, the disclosed numerical range is a preferred numerical range. Any person skilled in the art should understand that the preferred numerical range is only the numerical values with obvious technical effects or representativeness among many implementable numerical values. Since there are too many numerical values to enumerate, only some numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention. Moreover, the listed numerical values should not constitute a limitation on the protection scope of the present invention.

[0040] If the present invention discloses or involves components or structural members that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connected by bolts or screws), or can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integral structure (for example, manufactured by integral forming using a casting process) (except when it is obviously impossible to use the integral forming process).

[0041] In addition, for any of the technical solutions disclosed in the present invention as described above, the terms used to represent the positional relationship or shape, unless otherwise stated, include states or shapes that are approximate, similar, or close to them.

[0042] Any component provided by the present invention can either be assembled from multiple separate components or be a single component manufactured by an integral forming process.

[0043] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any person skilled in the art may use the technical content disclosed above to make changes or modifications into equivalent embodiments with equivalent changes. However, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A guiding plate structure with a T-shaped load transfer bar, characterized in that: It includes a first guide plate and a second guide plate located between the main beam and the connecting road surface. The joint of the first guide plate and the second guide plate is connected by a T-shaped load transfer bar. One end of the T-shaped load transfer bar is anchored on the first guide plate, and the other end is anchored on the second guide plate. The T-shaped load transfer bar includes a steel bar, and a round steel plate is welded to one end of the steel bar. A micro-motion structure is installed on the steel bar at one end of the round steel plate. The micro-motion structure includes a box body. The round steel plate is sleeved in the box body. Foam debris is filled between the side of the round steel plate away from the steel bar and the inner wall of the box body. A rubber ring is filled between the side of the round steel plate close to the steel bar and the inner wall of the box body. Both the first guide plate and the second guide plate are formed by concrete casting. A No. 1 expansion joint board is clamped at the joint of the first guide plate and the second guide plate. A No. 2 expansion joint board is clamped between the second guide plate and the connecting road surface. The first guide plate is fixedly connected to the main beam through connecting steel bars.

2. The lead plate structure with a T-shaped load transfer bar according to claim 1, characterized in that: The box body includes a plastic cylinder box. The plastic cylinder box is sleeved on the round steel plate. A plastic cylinder cover is sleeved at the connection of the steel bar and the round steel plate. One end of the plastic cylinder cover is sleeved outside the plastic cylinder box, and the other end is sleeved on the steel bar. The plastic cylinder box is wrapped with a metal sleeve, and the metal sleeve is sleeved on the end of the plastic cylinder cover outside the plastic cylinder box.

3. The lead plate structure with a T-shaped load transfer bar according to claim 2, characterized in that: Putty filler is smeared on the inner wall surfaces of the plastic cylinder box and the plastic cylinder cover to fill the gaps. Asphalt is smeared on the middle section surface of the steel bar at the joint corresponding to the first guide plate and the second guide plate, and a polyethylene film is wrapped to prevent corrosion.

4. The construction of the guiding plate with a T-shaped load transfer bar according to claim 3, characterized in that: A sliding material layer is laid under the first guide plate, the second guide plate, the No. 1 expansion joint board and the No. 2 expansion joint board. Behind the abutment fill is compacted under the connecting road surface and the sliding material layer.

5. A construction method of a guide plate structure with a T-shaped load transfer bar, adopting the guide plate structure with a T-shaped load transfer bar as described in claim 4, characterized in that: (1) Precast the T-shaped load transfer bar: smear putty filler on the inner wall of the plastic cylinder box, then fill foam debris into it, weld the round steel plate to the steel bar, put the steel bar and the round steel plate into the plastic cylinder box, place the round steel plate on the foam debris, put the rubber ring into the plastic cylinder box and place it on the round steel plate, smear putty filler on the inner wall of the plastic cylinder cover and then cover it on the plastic cylinder box to make it airtight, sleeve the metal sleeve on the plastic cylinder box and the plastic cylinder cover to fix it, smear asphalt on the middle section surface of the steel bar and wrap a polyethylene film to isolate it from corrosion; (2) Pass the fabricated T-shaped load transfer bar through the No. 1 expansion joint board, and perform vertical support and positioning through a bracket, then place it on the behind the abutment fill that has been pre-laid with a sliding material layer, and then pour the first guide plate and the second guide plate at both ends of the T-shaped load transfer bar respectively. The first guide plate is cast and fixedly connected to the main beam through pre-set connecting steel bars. A No. 2 expansion joint board is pre-clamped between the second guide plate and the connecting road surface.

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