A structure for connecting bridge piers and roads and its construction method.

Abstract

This invention discloses a structure and construction method for connecting a bridge pier and a road. The structure includes a bridge pier and a road located outside the bridge pier. A settlement plate is installed at the connection between the bridge pier and the road. The settlement plate includes a fixed block and a sliding block that are in contact with each other and can slide relative to each other. Lubricating grease is applied to the contact surfaces of the fixed block and the sliding block. The fixed block is connected to the side surface of the bridge pier, and the sliding block is connected to the side surface of the road. This structure allows for uniform settlement of the road at the bridge pier, and the construction method is simple and rapid.

Description

Technical Field

[0001] This invention relates to the fields of road design and construction, and in particular to a structure for connecting bridge piers and roads and its construction method. Background Technology

[0002] The construction of urban elevated roads is progressing rapidly. Due to land constraints, roads beneath these elevated roads are typically built very close to the bridge piers. Bridge piers generally use bored piles, resulting in minimal settlement. However, even with expensive soft soil treatment techniques, settlement is still inevitable for surface roads on soft soil foundations. Article 7.7.1 of the Road Design Code JTG D30-2015, "Specifications for Highway Subgrade Design," stipulates that for expressways and Class I highways, the allowable post-construction settlement at the junction of piers and embankments is ≤0.10m; at culverts, box culverts, and underpasses, ≤0.20m; and for general road sections, ≤0.30m. The allowable post-construction settlement regulations for expressways and arterial roads in urban road subgrade design codes are consistent with those for highways. However, in bridge structures, uneven settlement of piers and abutments can cause internal structural forces. Therefore, these settlements are generally strictly controlled. The uneven settlement of conventional bored pile piers and abutments is controlled to within 2cm. Therefore, the settlement of piers and abutments is less than that of the road itself.

[0003] As can be seen from the above design specifications, once a road connects with a bridge, the bridge piers and abutments constrain the road's settlement. Taking the entire road as an example, if only a portion connects to the bridge, the constrained section settles more slowly, while the unconstrained section settles more quickly, resulting in differential settlement in both the width and length directions, causing the road to appear wavy. For ground-level roads under elevated highways, due to the spaced arrangement of bridge piers, settlement reduction technologies are not only costly but also insufficient to prevent the damage caused by differential settlement.

[0004] When differential settlement occurs between roads and bridge piers, and the difference exceeds 0.5%, it can cause vehicles to bounce, leading to driving discomfort and safety accidents. In severe cases, it can cause vehicles to collide with bridge piers.

[0005] In view of the above problems, the present invention designs a structure for connecting bridge piers and roads and a construction method thereof, which leads to this case. Summary of the Invention

[0006] This invention provides a structure for connecting bridge piers and roads, and a construction method thereof. This structure allows for uniform settlement of the road surrounding the bridge piers and abutments, and the construction method is simple and rapid. Specifically, this invention is achieved through the following technical solutions:

[0007] A structure for connecting a bridge pier and a road includes a bridge pier and a road located outside the bridge pier. A settlement plate is provided at the connection between the bridge pier and the road. The settlement plate includes a fixed block and a sliding block that are in contact with each other and can slide relative to each other. Lubricating grease is provided on the contact surfaces of the fixed block and the sliding block. The fixed block is connected to the side surface of the bridge pier, and the sliding block is connected to the side surface of the road.

[0008] Furthermore, the coefficient of friction u between the fixed block and the sliding block f ≤0.08.

[0009] Furthermore, the fixing block includes a polytetrafluoroethylene plate and a rubber plate that are stacked and connected together. The rubber plate is used to contact the side surface of the bridge pier, and the polytetrafluoroethylene plate is used to contact the sliding block.

[0010] Furthermore, several oil storage pits are provided on the surface of the polytetrafluoroethylene plate that is in contact with the sliding block.

[0011] Furthermore, the total area of ​​the oil storage pit accounts for 20% to 30% of the surface area of ​​the oil storage pit, and the depth of the oil storage pit is 2±0.5mm.

[0012] Furthermore, the polytetrafluoroethylene sheet and the rubber sheet are bonded together by vulcanization.

[0013] Furthermore, the sliding block includes a stainless steel plate.

[0014] Furthermore, the road surface is higher than the top surface of the bridge pier cap, and a retaining wall flush with the edge of the cap is set on the top surface of the cap, with a settlement plate extending between the road and the retaining wall.

[0015] A construction method for a structure connecting a bridge pier and a road includes the following steps:

[0016] S1. Connect the fixing block to the side surface of the completed bridge pier;

[0017] S2. The other side surface of the fixed block is in contact with and adheres to one side surface of the sliding block. Lubricant is applied between the two, and tape is used to temporarily fix the fixed block and the sliding block.

[0018] S3. On the outside of the bridge piers, road construction is carried out, and the road is connected to the sliding block.

[0019] Furthermore, if the road surface is higher than the top surface of the bridge pier cap, step S4 is added: a retaining wall flush with the edge of the cap is installed on the top surface of the cap, and a settlement plate is extended between the road and the retaining wall.

[0020] The beneficial effects of this invention are as follows:

[0021] The fixed block and the sliding block can slide relative to each other. The road settlement is greater than the bridge pier settlement. Therefore, the road settlement causes the sliding block to move relative to the fixed block. At this time, the road settlement and the bridge pier settlement are separate and do not restrain each other. If the road structure and geological conditions are basically the same, the road surface near the bridge pier will settle synchronously with the road surface far away, and the road surface will remain flat, thus reducing differential settlement. If the road is a retaining wall, the part near the bridge pier will settle synchronously with the retaining wall far away, and the retaining wall will not crack.

[0022] If the road surface is higher than the top surface of the bridge pier cap, a retaining wall flush with the edge of the cap is installed on the top surface of the cap. The settlement plate also separates the road from the retaining wall, so the settlement of the road is not affected by the bridge pier and retaining wall.

[0023] The entire settlement slab structure is simple, the construction method is relatively convenient, and the construction is relatively economical. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a structural embodiment of the connection between a bridge pier and a road provided by the present invention;

[0025] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0026] Figure 3 This is a schematic diagram of an embodiment of a settling plate provided by the present invention;

[0027] Figure 4 This is a schematic diagram of an embodiment of a polytetrafluoroethylene (PTFE) sheet provided by the present invention.

[0028] Among them: 1. Settlement plate; 11. Fixing block; 111. Polytetrafluoroethylene plate; 1111. Oil storage pit; 112. Rubber plate; 12. Sliding block; 2. Bridge pier; 21. Column; 22. Foundation; 3. Road; 4. Retaining wall. Detailed Implementation

[0029] Preferred embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be more thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0030] In the following description, certain specific details are set forth for the purpose of illustrating various embodiments of the invention to provide a thorough understanding of these embodiments. However, those skilled in the art will recognize that embodiments may be practiced without one or more of these specific details. In other instances, well-known apparatuses, structures, and techniques associated with this disclosure may not have been shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0031] Unless the context requires otherwise, throughout the specification and claims, the word “comprising” and its variations, such as “including” and “having”, shall be understood to have an open, inclusive meaning, that is, to be interpreted as “including, but not limited to”.

[0032] Throughout this specification, references to "one embodiment" or "some embodiments" indicate that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment. Furthermore, a particular feature, structure, or characteristic may be combined in any manner in one or more embodiments.

[0033] Furthermore, the terms "first," "second," etc., used in the specification and claims are used only for clarity of description to distinguish between different objects, and do not limit the size or other order of the objects they describe.

[0034] like Figure 1 , 2 As shown, a structure connecting a bridge pier and a road includes a bridge pier 2, a road 3, and a settlement plate 1. The settlement plate 1 is disposed on the outer side of the bridge pier 2. The settlement plate 1 includes a sliding block 12 and a fixed block 11 that are in contact with each other and can slide relative to each other. Lubricating grease is applied to the contact surface between the sliding block 12 and the fixed block 11 to reduce the coefficient of friction between the two blocks and ensure the coefficient of friction u between the sliding block 12 and the fixed block 11. f ≤0.08. The fixed block 11 is used to connect with the outer surface of the bridge pier 2, and the sliding block 12 is used to connect with the road 3. Therefore, in the horizontal direction, a structure connecting the bridge pier and the road includes the bridge pier 2, the settlement plate 1, and the road 3 in sequence. The settlement of the road 3 is greater than the settlement of the bridge pier 2. Therefore, the settlement of the road 3 causes the sliding block 12 to move relative to the fixed block 11. At this time, the settlement of the road 3 and the settlement of the bridge pier 2 are separate and do not interfere with each other.

[0035] In a specific bridge pier structure, the bridge pier 2 includes a column 21 and a foundation 22. The column 21 rests on the foundation 22. When the road surface of the road 3 is higher than the top surface of the foundation 22 of the bridge pier 2, a retaining wall 4 is set on the side of the road 3. The retaining wall 4 rests above the top surface of the foundation 22 of the bridge pier 2. The settlement plate 1 extends upward to the space between the road 3 and the retaining wall 4. In the extended settlement plate 3, the fixing block 11 is connected to the retaining wall, and the sliding block 12 is connected to the road 3.

[0036] 1. Sliding block 12.

[0037] like Figure 3 As shown, the sliding block 12 includes a stainless steel plate, the grade of which is 06Cr17Ni12Mo2 or 06Cr19Ni13Mo03, and its surface finish is not lower than grade 11, i.e. Ra0.1~0.2um 8k mirror stainless steel. The product performance standard should comply with GB / T 4237-2015 "Hot-rolled stainless steel plates and strips", and the product requirements should meet the provisions of clause 5.3.3 of JT / T4-2019 "Roller bearings for highway bridges".

[0038] The thickness of the stainless steel sheet is between 1mm and 3mm, with 2mm being the preferred thickness.

[0039] II. Fixing block 11.

[0040] like Figure 3 As shown, the fixing block 11 includes a polytetrafluoroethylene plate 111 and a rubber plate 112, and the polytetrafluoroethylene plate 111 and the rubber plate 112 are bonded together by vulcanization.

[0041] Polytetrafluoroethylene sheet 111 is made of polytetrafluoroethylene (PTEE) or modified polytetrafluoroethylene, with a thickness of 3-4 mm, and its performance should comply with JT / T 901.

[0042] like Figure 3 As shown, one surface of the polytetrafluoroethylene sheet 111 is bonded to the rubber sheet 112, and the other surface is used to contact the fixing block 11, as shown. Figure 4 As shown, a plurality of oil reservoirs 1111 are provided on the surface of the polytetrafluoroethylene plate 111 that contacts the fixing block 11. The total area of ​​the oil reservoirs 1111 on this side surface accounts for 20% to 30% of the area of ​​this side surface. The depth of the oil reservoirs 1111 is 2±0.5 mm, and the oil reservoirs 1111 are circular or elliptical. The design of the oil reservoirs 1111 can extend the service life of the grease and can store a larger amount of grease.

[0043] The function of the PTFE plate 111 is to reduce the coefficient of friction between the sliding block 12 and the fixed block 11. When the PTFE plate 111 comes into contact with the stainless steel plate (with silicone), the coefficient of friction u... f=0.06.

[0044] The rubber sheet 112 is made of neoprene rubber or natural rubber; the thickness of the rubber sheet 112 is between 8mm and 12mm, preferably 10mm; the hardness of the rubber sheet 112 meets 60±5IRHD, and its physical properties should meet the requirements of Article 5.3.1 of JT / T4-2019 "Road Bridge Plate Rubber Bearings".

[0045] The rubber sheet 112 reduces the requirements for the surface flatness of the bridge pier 2; at the same time, the settlement plate 1 is installed between the bridge pier 2 and the road 3. When the road 3 descends relative to the bridge pier 2, a settlement joint appears at the junction of the two. At this time, the rubber sheet 112 also serves to block the settlement joint to prevent water seepage or soil exposure. The rubber sheet 112 also buffers the lateral impact of vehicle loads on the road surface of the road 3.

[0046] 3. Lubricating grease.

[0047] The material of the lubricating grease can be selected as 5201-2 silicone grease, and its performance should meet the requirements of a certain product in HG / T2502.

[0048] Lubricating grease is applied to the surface of the polytetrafluoroethylene plate 111 where the oil reservoir 111 is provided. Therefore, lubricating grease is applied between the sliding block 12 and the fixed block 11, that is, lubricating grease is applied between the stainless steel plate and the polytetrafluoroethylene plate 111. At this time, the coefficient of friction (u) between the polytetrafluoroethylene plate 111 and the stainless steel is... f ≤0.08).

[0049] IV. Road 3.

[0050] Road 3 consists of, from bottom to top, foundation pit crushed stone or roadbed filling material, cement-stabilized crushed stone base course, and asphalt concrete surface course. The connection between road 3 and sliding block 12 is achieved by utilizing the friction between the side surface of road 3 and sliding block 12 (generally with a friction coefficient of around 0.3).

[0051] When the road surface of Road 3 is higher than the top surface of the abutment 22 of Bridge Pier 2, a concrete retaining wall 4 shall be added to the top surface of the abutment 22 of Bridge Pier 2. The side of the retaining wall 4 shall be flush with the side of Bridge Pier 2, and the top surface of the retaining wall 4 shall be flush with Road 3. When the fixing block 11 and the slider 12 are placed, they shall be flush with the top of the retaining wall 4, and the fixing block 11 shall be in close contact with the side of the retaining wall 4 and the side of Bridge Pier 2. To prevent the backfill material around Bridge Pier 2 from blocking the vertical sliding of the slider 12, the roadbed fill material within 30cm of the bottom plate of the settlement slab shall be plain soil backfill, and block materials shall be avoided.

[0052] The fixing block 11 is connected to the bridge pier 2 by an adhesive, which can be epoxy resin.

[0053] The sliding block 12 can be connected to the road 3 via concrete. Alternatively, the sliding block 12 can be in direct contact with the road 3, achieving a connection through friction. Let the friction between the sliding block 12 and the road 3 be considered f1, and the friction between the sliding block 12 and the fixed block 11 be considered f2. As long as f1 > f2, the sliding block 12 and the road 3 will settle synchronously relative to the fixed block 11. Therefore, the connection between the fixed block 11 and the bridge pier 2, and the connection between the sliding block 12 and the road 3, in both descriptions, refers to the synchronous movement of the connected components.

[0054] V. A construction method for a structure connecting bridge piers and roads.

[0055] S1. The surface of the rubber plate 112 in the fixing block 11 is pasted on the outer side of the completed bridge pier 2.

[0056] S2. One side of the polytetrafluoroethylene plate 111 in the fixed block 11 is in contact with one side of the sliding block 12, and grease is applied between them. At the same time, the fixed block 11 and the sliding block 12 are temporarily fixed with tape, and the periphery of the settlement plate 1 is covered with a film to prevent dust.

[0057] S3. On the outside of the bridge pier 2, the road 3 is constructed, and the side of the road 3 is connected to the sliding block 12.

[0058] If the road surface of road 3 is higher than the top surface of the abutment 22 of bridge pier 2, then S4 is added and a retaining wall 4 is set on the side of road 3.

[0059] After the separate settlement plate 1 is installed, its fixing block 11 contacts the bridge pier 2, and its sliding block 12 connects with the road 3. The fixing block 11 and the sliding block 12 are in contact and can slide relative to each other, thus isolating the road 3 from the bridge pier 2. Due to the coefficient of friction u between the fixing block 11 and the sliding block 12... f Since the slope is ≤0.08, when road 3 settles, it is not constrained by bridge pier 2. Therefore, the road surface near the bridge pier 2 settles synchronously with the road surface far from the bridge pier 2, keeping the road surface flat and reducing differential settlement. If the road surface of road 3 is higher than the top surface of the abutment 22 of bridge pier 2, a retaining wall 4 is set on the side of road 3. The retaining wall 4 rests on the abutment 22, and the settlement plate 1 also separates the connection between road 3 and retaining wall 4. Therefore, the settlement of road 3 does not affect retaining wall 4, and retaining wall 4 will not crack.

[0060] Unless otherwise specified in this specification, all techniques described herein are conventional in the field.

[0061] The above are preferred embodiments of the present invention. Any other simple substitutions and modifications made under the premise of the present invention should be considered as falling within the protection scope of the present invention.

Claims

1. A construction method for a structure connecting a bridge pier and a road, comprising a bridge pier and a road located outside the bridge pier, wherein a settlement plate is provided at the connection between the bridge pier and the road, the settlement plate comprising a fixed block and a sliding block that are in contact with each other and can slide relative to each other, a lubricant is provided on the contact surface of the fixed block and the sliding block, the fixed block is connected to the side surface of the bridge pier, and the sliding block is connected to the side surface of the road; the fixed block comprises a polytetrafluoroethylene (PTFE) plate and a rubber plate that are stacked and connected, the rubber plate is used to contact the side surface of the bridge pier, and the PTFE plate is used to contact the sliding block; a plurality of oil reservoirs are provided on the surface of the PTFE plate that is in contact with the sliding block; the PTFE plate and the rubber plate are bonded together by vulcanization; the sliding block comprises a stainless steel plate; characterized in that: Includes the following steps: S1. Connect the fixing block to the side surface of the completed bridge pier; S2. The other side surface of the fixed block is in contact with and adheres to one side surface of the sliding block. Lubricant is applied between the two, and tape is used to temporarily fix the fixed block and the sliding block. S3. On the outside of the bridge piers, road construction is carried out, and the road is connected to the sliding block.

2. The construction method for a structure connecting bridge piers and roads according to claim 1, characterized in that: The coefficient of friction between the fixed block and the sliding block is uf≤0.

08.

3. The construction method for a structure connecting bridge piers and roads according to claim 1, characterized in that: The total area of ​​the oil storage pit accounts for 20% to 30% of the surface area of ​​the oil storage pit, and the depth of the oil storage pit is 2±0.5mm.

4. The construction method for a structure connecting bridge piers and roads according to claim 1, characterized in that: If the road surface is higher than the top surface of the bridge pier cap, a retaining wall flush with the edge of the cap shall be installed on the top surface of the cap, and a settlement plate shall be installed between the road and the retaining wall.

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