A method for ensuring bridge bearings meet the requirements of tension displacement and seismic consolidation

Abstract

This invention belongs to the field of bridge construction, specifically a method for ensuring bridge bearings meet the requirements of tension displacement and seismic consolidation. The method involves filling the relative sliding areas inside the bridge bearing with a medium, which is a soft, elastic material. Before filling, the medium is encapsulated in a medium membrane. During bridge tensioning, if the tensioning speed is less than the design value, the medium deforms, releasing the tension stress at the relative sliding areas inside the bridge bearing. During an earthquake, if the displacement speed exceeds the design value, the medium remains unchanged, thus consolidating the bridge bearing with the bridge deck and piers as a unified whole to jointly withstand seismic forces. This invention, by filling the bridge bearing with a medium, enables the bridge bearing to function normally during bridge erection and under special conditions such as earthquakes, thus improving the functionality of bridge bearings.

Description

Technical Field

[0001] This invention belongs to the field of bridge construction, specifically a method for enabling bridge bearings to meet the requirements of tension displacement and seismic consolidation. Background Technology

[0002] Bridge bearings are crucial components connecting the superstructure and substructure of a bridge. During normal bridge use, they reliably transfer the reaction forces and deformations of the superstructure to the substructure. However, during bridge construction, the transverse direction of the bridge beams often employs prestressed structures. After tensioning, the transverse support stiffness is high, but this prestressing is often constrained by the bridge bearings, posing safety hazards to the normal stress distribution of the beams. Sometimes, even under tensioning conditions, problems can occur with the bridge bearings or piers. Furthermore, during earthquakes, only the fixed bridge bearings bear the seismic forces. The piers and fixed bridge bearings are relatively large. If all bridge bearings could share the seismic forces during an earthquake, the size of the bearings and piers would be significantly reduced, greatly lowering the bridge's construction cost. Therefore, developing a method that allows bearings to both accommodate transverse tensioning displacement and remain firmly fixed during earthquakes is urgently needed. Summary of the Invention

[0003] In view of the above-mentioned problems of bridge bearings, the purpose of this invention is to provide a method for bridge bearings to meet the requirements of tension displacement and seismic consolidation.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] The method of this invention involves filling the relative sliding area inside the bridge bearing with a medium, which is a soft, elastic material. Before filling the medium, a medium membrane is used to wrap the medium. During bridge tensioning, if the tensioning speed is less than the design value, the medium deforms, releasing the tension stress at the relative sliding area inside the bridge bearing. During an earthquake, if the displacement speed is greater than the design value, the medium does not deform, thus fixing the bridge bearing, bridge deck, and piers into a unified whole to jointly withstand the seismic force.

[0006] Wherein: the medium is a shear thickening fluid.

[0007] The shear thickening fluid is a shock-absorbing gel, liquid glass, magnetic rubber, silicone, or bouncy clay.

[0008] The medium, by weight percentage, comprises: 3-8% polydimethylsiloxane, 40-60% hydroxyl-terminated polydimethylsiloxane, 3-8% methyl hydrosilicone oil, 2-7% dimethyldimethoxysilane, 4-9% polyethylene wax, 1-4% boric acid, 15-25% silica-boric acid, 1-6% titanium dioxide, and 1-3% glycerol.

[0009] The dielectric membrane is made of a material with good flexibility and high tensile elongation.

[0010] The sliding mating surfaces at the relative sliding points inside the bridge bearing are precision machined and polished, with a friction coefficient of 0.05 to 0.2.

[0011] The advantages and positive effects of this invention are as follows:

[0012] This invention fills the inside of the bridge bearing with a medium, allowing the bridge bearing to shift during bridge erection to avoid constraining prestress. In special conditions such as earthquakes, it becomes an integral part of the bridge deck and piers, jointly bearing seismic forces. Therefore, the bridge bearing can be used normally whether the bridge is being erected or during an earthquake, thus improving the function of the bridge bearing. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0014] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0015] Figure 3 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0016] Wherein: 1 is the upper support plate, 2 is the lower support plate, 3 is the middle liner plate, 4 is the rubber plate, 5 is the medium, 6 is the medium sliding point, and 7 is the movable guide bar. Detailed Implementation

[0017] The invention will now be described in further detail with reference to the accompanying drawings.

[0018] The method of this invention involves filling the relative sliding area inside the bridge bearing with a medium, which is a soft, elastic material. Before filling the medium, a medium membrane is used to wrap it. During bridge tensioning, the tensioning speed (which can be 10-35 mm / min) is less than the design value, causing the medium to deform and releasing the tension stress at the relative sliding area inside the bridge bearing. During an earthquake, the displacement speed (which can be 200 mm / s-800 mm / s) is greater than the design value, and the medium does not deform, thus fixing the bridge bearing, bridge deck, and piers into a whole to jointly bear the seismic force.

[0019] The medium in this embodiment can be a shear thickening liquid, preferably one of the following: shock-absorbing gel, liquid glass, magnetic rubber, silicone, or bouncy clay. Its components include: polydimethylsiloxane, hydroxyl-terminated polydimethylsiloxane, methyl hydrogen silicone oil, dimethyldimethoxysilane, polyethylene wax, boric acid, silica, titanium dioxide, glycerin, etc., as shown in the table below.

[0020]

[0021]

[0022] At room temperature, the medium itself is between a liquid and a solid. The shear stress and shear strain rate of the medium are not always linearly related. The surface tension of the medium will change due to the pressure or impact speed. The greater the pressure and the faster the impact, the greater the increase in tension. In ideal conditions, under extremely strong force and rapid impact, the medium itself will become a temporary solid.

[0023] The dielectric membrane in this embodiment is made of a material with good flexibility and high tensile elongation, which can better release the fluid properties of the medium itself. For example, a PE membrane or a PVC membrane can be used.

[0024] In this embodiment, the sliding mating surfaces at the relative sliding points inside the bridge bearing are precision machined and polished, with a friction coefficient of 0.05 to 0.2.

[0025] Example 1

[0026] like Figure 1 As shown, the bridge bearing in this embodiment includes an upper bearing plate 1, a lower bearing plate 2, a middle liner plate 3, and a rubber plate 4. The middle liner plate 3 is located between the upper bearing plate 1 and the lower bearing plate 2, and the rubber plate 4 is disposed between the middle liner plate 3 and the lower bearing plate 2. In this embodiment, the medium sliding area 6 between the middle liner plate 3 and the lower bearing plate 2 is filled with a medium 5. The medium, by mass percentage, consists of 3% polydimethylsiloxane, 50% hydroxyl-terminated polydimethylsiloxane, 8% methyl hydrogen silicone oil, 7% dimethyldimethoxysilane, 4% polyethylene wax, 4% boric acid, 15% silica-boric acid, 6% titanium dioxide, and 3% glycerol.

[0027] Example 2

[0028] like Figure 2 As shown, the bridge bearing in this embodiment includes an upper bearing plate 1, a lower bearing plate 2, a middle liner plate 3, and a rubber plate 4. The middle liner plate 3 is located between the upper bearing plate 1 and the lower bearing plate 2 and consists of two layers. The rubber plate 4 is installed between the lower middle liner plate 3 and the lower bearing plate 2. In this embodiment, the medium sliding area 6 between the upper and lower middle liners 3 is filled with a medium 5. The medium, by mass percentage, consists of 8% polydimethylsiloxane, 40% hydroxyl-terminated polydimethylsiloxane, 3% methyl hydrogen silicone oil, 2% dimethyldimethoxysilane, 9% polyethylene wax, 4% boric acid, 25% silica-boric acid, 6% titanium dioxide, and 3% glycerol.

[0029] Example 3

[0030] like Figure 3As shown, the bridge bearing in this embodiment includes an upper bearing plate 1, a lower bearing plate 2, a middle liner plate 3, a rubber plate 4, and a movable guide bar 7. The middle liner plate 3 is located between the upper bearing plate 1 and the lower bearing plate 2, and the rubber plate 4 is disposed between the middle liner plate 3 and the lower bearing plate 2. The movable guide bar 7 is installed on the upper bearing plate 1. In this embodiment, the medium sliding area 6 between the movable guide bar 7 and the upper bearing plate 1 is filled with a medium 5, which, by mass percentage, consists of 5% polydimethylsiloxane, 60% hydroxyl-terminated polydimethylsiloxane, 5% methyl hydrogen silicone oil, 4% dimethyldimethoxysilane, 6% polyethylene wax, 4% boric acid, 10% silica-boric acid, 4% titanium dioxide, and 2% glycerol.

Claims

1. A method of satisfying both the post-tensioning displacement and the seismic anchorage of a bridge bearing, characterized by: The medium is filled in the relative sliding position inside the bridge support, the medium is soft and elastic material, and the medium is wrapped by a medium film before being filled; when the bridge is tensioned, the tension speed of the bridge is less than the design value, the medium is deformed, and the tension stress is released at the relative sliding position inside the bridge support; When the earthquake occurs, the displacement speed of the earthquake is greater than the design value, the medium is not deformed, the bridge support, the bridge deck and the bridge pier are integrated as a whole to bear the earthquake force together; The medium is shear thickening liquid. The medium is composed of the following components in percentage by mass: 3-8% of polydimethylsiloxane, 40-60% of hydroxyl-terminated polydimethylsiloxane, 3-8% of methyl hydrogen-containing silicone oil, 2-7% of dimethyldimethoxysilane, 4-9% of polyethylene wax, 1-4% of boric acid, 15-25% of silica boric acid, 1-6% of titanium dioxide and 1-3% of glycerol.

2. The method of satisfying both the tensile displacement and seismic anchorage requirements of a bridge bearing according to claim 1, wherein: The medium film is made of material with good flexibility and large tensile elongation.

3. The method of satisfying both the tensile displacement and seismic anchorage requirements of a bridge bearing according to claim 1, wherein: The sliding matching surface of the relative sliding position inside the bridge support is finely processed and polished, and the friction coefficient is 0.05-0.2.

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