Expansion joint structure of bridge

Abstract

The invention provides an expansion joint structure of a bridge. The expansion joint structure is characterized by comprising a longitudinal beam assembly and a plurality of cross beam assemblies, the longitudinal beam assembly comprises a middle beam and two side beams, first springs used for enabling the middle beam to reset in the axial direction are arranged at the two ends of the middle beam, and the first springs are kept in a compressed state. The peripheral surface of the cross beam is a cylindrical surface, the two ends of the cross beam are supported by the two supporting roller frames respectively, and the cross beam can rotate on the supporting roller frames along the axis of the cross beam; the middle beam is horizontally arranged above the cross beams, the axial direction of the middle beam is perpendicular to the axial direction of the cross beams, the lower side face of the middle beam makes contact with the peripheral faces of the cross beams, and the middle beam can slide back and forth on the cross beams in the axial direction of the middle beam. By adopting the expansion joint structure, the service life of the expansion joint can be prolonged, and the use and maintenance cost of the expansion joint can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of expansion joints of bridges, in particular to an expansion joint structure of a bridge. Background Art

[0002] During the use of the bridge, in order to prevent the bridge deck from deforming when it is subjected to thermal expansion and contraction caused by the ambient temperature or external forces, expansion joints are usually set between two bridge sections, between a bridge section and an abutment, or at the hinged position of the bridge, and relevant devices for achieving bridge expansion and contraction are installed in the expansion joints. The structural forms of expansion joints currently mainly include butt-jointed expansion joints, modular support expansion joints, shear expansion joints, etc.

[0003] The digital model supported expansion joint can be used for expansions of more than 80mm. It mainly includes a cross beam, a middle beam and two side beams. The two side beams are connected to the bridge sections on both sides of the expansion joint, and the middle beam is set between the two side beams. The cross beam is set vertically below the middle beam to support the middle beam and the two side beams.

[0004] Digital model supported expansion joints can compensate for the longitudinal displacement of bridge beams and slabs along the direction of the bridge. However, in actual use, due to the influence of lateral winds, vehicle driving and other factors on the bridge, external forces along the lateral direction of the bridge will be applied to the expansion joints, especially the center beam, causing the center beam to move back and forth along its own axial direction. This displacement causes mutual friction between the center beam and the cross beam. As the frequency of this displacement increases, the wear between the center beam and the cross beam intensifies, which will not only cause the settlement and displacement of the center beam, affecting the passage of vehicles, but also seriously affect the service life of the expansion joint and increase the maintenance and use costs. Summary of the invention

[0005] In view of the problems of the background technology, the present invention provides an expansion joint structure for a bridge to solve the problems of short service life of the expansion joint and high maintenance and use costs.

[0006] To achieve the purpose of the present invention, the present invention provides an expansion joint structure of a bridge, wherein the expansion joint is used to connect two adjacent bridge sections, and the two adjacent bridge sections are recorded as a left bridge section and a right bridge section, and the innovation point is that: it includes a longitudinal beam assembly and a plurality of cross beam assemblies; the longitudinal beam assembly includes a middle beam and two side beams, the middle beam and the side beams are arranged in parallel in the axial direction, the two side beams are symmetrically arranged on the left and right sides of the middle beam, the two side beams are fixedly connected to the left bridge section and the right bridge section respectively, and a spacing is arranged between the side beams and the middle beam; an end baffle is respectively arranged on the outer side of both ends of the middle beam, and the end baffle is composed of a plate A and a plate B perpendicular to each other, the plate A is pre-embedded and fixed in the left bridge section or the right bridge section, and the plate B is perpendicular to the axial direction of the middle beam; both ends of the middle beam are provided with a first spring for resetting the middle beam in the axial direction, one end of the first spring is fixedly connected to the end face of the middle beam, and the other end of the first spring contacts the inner side face of the plate B; A plurality of crossbeam assemblies are distributed along the axial direction of the middle beam; a single crossbeam assembly comprises a crossbeam, two supporting roller frames and two rectangular frames; the two rectangular frames are respectively embedded in the concrete of the left bridge section and the right bridge section, one end of the rectangular frame is open, and the openings of the two rectangular frames are arranged opposite to each other; the two supporting roller frames are respectively fixedly arranged in the two rectangular frames, a single supporting roller frame comprises two rollers and two supporting frames, the lower parts of the two supporting frames are fixedly connected to the lower side surfaces in the rectangular frames, the two rollers are respectively hinged to the upper parts of the two supporting frames, and the rollers can rotate along their own axes; the outer peripheral surface of the crossbeam is a cylindrical surface, the two ends of the crossbeam are respectively supported by the two supporting roller frames, the axial direction of the rollers is arranged parallel to the axial direction of the crossbeam, the roller surfaces of the two rollers of the single supporting roller frame are in contact with the outer peripheral surface of the crossbeam, and the crossbeam can rotate along its own axis on the supporting roller frame; the axial direction of the crossbeam is arranged horizontally, the end face of the crossbeam is spaced from the inner side surface of the rectangular frame on the same side, and the axial directions of the plurality of crossbeams are arranged parallel to each other; The center beam is horizontally arranged above the cross beam, the axial direction of the center beam is perpendicular to the axial direction of the cross beam, the lower side of the center beam contacts the outer peripheral surfaces of the plurality of cross beams, and the center beam can slide back and forth along its own axial direction on the cross beam.

[0007] As an optimization, the beam assembly also includes two limit frames, which are respectively arranged directly above the two ends of the beam. A single limit frame includes a buffer plate and a second spring. The buffer plate is horizontally arranged, the upper end of the second spring is connected to the inner side surface of the rectangular frame, the lower end of the second spring is connected to the upper side surface of the buffer plate, and the lower side surface of the buffer plate is opposite to the beam.

[0008] As an optimization, the axial direction of the second spring is arranged along the radial direction of the cross beam.

[0009] As an optimization, a water-retaining and dust-proof belt is arranged between the center beam and the side beam, and the water-retaining and dust-proof belt is made of rubber. The principle of the present invention is as follows: In order to solve the wear problem caused by the surface-to-surface friction between the center beam and the cross beam of the expansion joint, the present invention creatively designs the cross beam as a cylindrical structure, the axes of the cross beam and the center beam are arranged perpendicular to each other, the lower part of the cross beam is supported by the rollers of the support roller frame, the cross beam can roll along its own axis on the support roller frame, the cross beam and the center beam are in line contact, when the center beam moves on the cross beam, the cross beam rolls, which greatly reduces the wear degree between the contact surface of the cross beam and the center beam, delays the deformation of the two during use, improves the overall service life of the expansion joint, and reduces the maintenance and use costs; on the other hand, a first spring is arranged at both ends of the center beam, the elastic modulus or number of the spring can be determined according to the design parameters of the bridge and the designed traffic flow and bearing capacity, etc., the purpose is to ensure that the center beam can be displaced along its axial direction under the action of the lateral external force along the bridge or the impact force of the vehicle running, so as to absorb the energy of the above external force, and at the same time, the center beam can be reset without obvious deformation, thereby affecting the normal expansion and contraction of the expansion joint, further reducing the maintenance and use costs of the expansion joint, and improving the service life of the expansion joint.

[0010] As an optimization solution, limit frames are set above the two ends of each beam. When the bridge produces vertical displacement and deformation due to uneven settlement, the limit frames can adapt to the vertical displacement of the beam and provide effective protection for the beam, further extending the service life of the beam and even the entire expansion joint.

[0011] As a further optimization solution, a water-retaining and dust-proof strip is set between the center beam and the side beam to prevent water or harmful liquids on the bridge deck from entering the expansion joint and corroding the various components of the expansion joint. At the same time, it prevents dust and dirt from entering the gaps of the expansion joint and accumulating, affecting the normal expansion and contraction of the expansion joint, thereby reducing the degree of wear between the various components and further extending the service life of the expansion joint.

[0012] It can be seen that the present invention has the following beneficial effects: the use of the expansion joint of the present invention can extend the service life of the expansion joint and reduce the maintenance and use costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings of the present invention are as follows: Attached Figure 1 It is a schematic diagram of the structure of the present invention; Attached Figure 2 For attachment Figure 1 AA section view; Attached Figure 3 For attachment Figure 1 BB cross-sectional view; Attached Figure 4 For attachment Figure 2 C-direction view.

[0014] In the attached figure: 1, middle beam; 2, side beam; 3, first spring; 4, cross beam; 5, support roller frame; 6, rectangular frame; 7, limit frame; 8, water-retaining and dust-proof belt; 9, end baffle; 51, roller; 52, support frame; 71, buffer plate; 72, second spring; 91, A plate; 92, B plate; 101, left bridge section; 102, right bridge section. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with the embodiments.

[0016] As attached Figure 1 To Attachment Figure 3 The expansion joint structure of the bridge shown in the figure is used to connect two adjacent bridge sections, and the two adjacent bridge sections are recorded as a left bridge section 101 and a right bridge section 102. The expansion joint structure includes a longitudinal beam assembly and a plurality of cross beam assemblies; the longitudinal beam assembly includes a middle beam 1 and two side beams 2, the middle beam 1 and the side beams 2 are arranged axially parallel, and the two side beams 2 are symmetrically arranged on the left and right sides of the middle beam 1, and the two side beams 2 are fixedly connected to the left bridge section 101 and the right bridge section 102 respectively, and the side beams 2 and the middle beam 1 are connected to each other. There is a spacing between them; an end baffle 9 is respectively arranged on the outer sides of both ends of the middle beam 1, and the end baffle 9 is composed of an A plate 91 and a B plate 92 which are perpendicular to each other, the A plate 91 is embedded and fixed in the left bridge section 101 or the right bridge section 102, and the B plate 92 is perpendicular to the axial direction of the middle beam 1; both ends of the middle beam 1 are provided with a first spring 3 for axially resetting the middle beam 1, one end of the first spring 3 is fixedly connected to the end face of the middle beam 1, and the other end of the first spring 3 contacts the inner side face of the B plate; A plurality of crossbeam assemblies are distributed along the axial direction of the middle beam; a single crossbeam assembly comprises a crossbeam 4, two support roller frames 5 and two rectangular frames 6; the two rectangular frames 6 are respectively pre-buried in the concrete of the left bridge section 101 and the right bridge section 102, one end of the rectangular frame 6 is open, and the openings of the two rectangular frames 6 are arranged opposite to each other; the two support roller frames 5 are respectively fixedly arranged in the two rectangular frames 6, and a single support roller frame 5 comprises two rollers 51 and two support frames 52, the lower parts of the two support frames 5 are fixedly connected to the lower side surfaces in the rectangular frames 6, and the two rollers 5 1 are respectively hinged to the upper parts of the two support frames 52, and the roller 51 can rotate along its own axis; the outer peripheral surface of the crossbeam 4 is a cylindrical surface, and the two ends of the crossbeam 4 are respectively supported by two support roller frames 5, and the axial direction of the roller 51 is arranged parallel to the axial direction of the crossbeam 4. The roller surfaces of the two rollers 51 of a single support roller frame 5 are in contact with the outer peripheral surface of the crossbeam 4, and the crossbeam 4 can rotate along its own axis on the support roller frame 5; the axial direction of the crossbeam 4 is arranged horizontally, and the end surface of the crossbeam 4 is spaced from the inner side surface of the rectangular frame 6 on the same side, and the axial directions of multiple crossbeams 4 are arranged parallel to each other; The center beam 1 is horizontally arranged above the cross beam 4, the axial direction of the center beam 1 is perpendicular to the axial direction of the cross beam 4, the lower side of the center beam 1 contacts the outer peripheral surfaces of multiple cross beams 4, and the center beam 1 can slide back and forth on the cross beam 4 along its own axial direction.

[0017] In order to avoid wear and deformation of the crossbeam 4 caused by the impact between the crossbeam 4 and the rectangular frame 6, the crossbeam assembly also includes two limit frames 7, and the two limit frames 7 are respectively arranged directly above the two ends of the crossbeam. A single limit frame 7 includes a buffer plate 71 and a second spring 72. The buffer plate 71 is horizontally arranged, the upper end of the second spring 72 is connected to the inner side surface of the rectangular frame 6, and the lower end of the second spring 72 is connected to the upper side surface of the buffer plate 71, and the lower side surface of the buffer plate 71 is opposite to the crossbeam 4.

[0018] In order to provide a better buffering effect, the axial direction of the second spring 72 is arranged along the radial direction of the cross beam 4 .

[0019] In order to prevent harmful liquids and solids from entering the expansion joint and affecting the normal use of the expansion joint and to increase the service life of the expansion joint, a water-retaining and dust-proof strip 8 is provided between the middle beam 1 and the side beam 2, and the water-retaining and dust-proof strip 8 is made of rubber.

Claims

1. An expansion joint structure of a bridge, wherein the expansion joint is used to connect two adjacent bridge sections, the two adjacent bridge sections are marked as a left bridge section and a right bridge section, and is characterized in that: It comprises a longitudinal beam assembly and a plurality of transverse beam assemblies; the longitudinal beam assembly comprises a middle beam and two side beams, the middle beam and the side beams are arranged in parallel in the axial direction, the two side beams are symmetrically arranged on the left and right sides of the middle beam, the two side beams are fixedly connected to the left bridge section and the right bridge section respectively, and a spacing is arranged between the side beams and the middle beam; an end baffle is arranged on the outer side of each end of the middle beam, the end baffle is composed of an A plate and a B plate perpendicular to each other, the A plate is embedded and fixed in the left bridge section or the right bridge section, and the B plate is perpendicular to the axial direction of the middle beam; both ends of the middle beam are provided with a first spring for resetting the middle beam in the axial direction, one end of the first spring is fixedly connected to the end face of the middle beam, and the other end of the first spring contacts the inner side face of the B plate; A plurality of crossbeam assemblies are distributed along the axial direction of the middle beam; a single crossbeam assembly comprises a crossbeam, two supporting roller frames and two rectangular frames; the two rectangular frames are respectively embedded in the concrete of the left bridge section and the right bridge section, one end of the rectangular frame is open, and the openings of the two rectangular frames are arranged opposite to each other; the two supporting roller frames are respectively fixedly arranged in the two rectangular frames, a single supporting roller frame comprises two rollers and two supporting frames, the lower parts of the two supporting frames are fixedly connected to the lower side surfaces in the rectangular frames, the two rollers are respectively hinged to the upper parts of the two supporting frames, and the rollers can rotate along their own axes; the outer peripheral surface of the crossbeam is a cylindrical surface, the two ends of the crossbeam are respectively supported by the two supporting roller frames, the axial direction of the rollers is arranged parallel to the axial direction of the crossbeam, the roller surfaces of the two rollers of the single supporting roller frame are in contact with the outer peripheral surface of the crossbeam, and the crossbeam can rotate along its own axis on the supporting roller frame; the axial direction of the crossbeam is arranged horizontally, the end face of the crossbeam is spaced from the inner side surface of the rectangular frame on the same side, and the axial directions of the plurality of crossbeams are arranged parallel to each other; The center beam is horizontally arranged above the cross beam, the axial direction of the center beam is perpendicular to the axial direction of the cross beam, the lower side of the center beam contacts the outer peripheral surfaces of the plurality of cross beams, and the center beam can slide back and forth along its own axial direction on the cross beam.

2. The expansion joint structure of a bridge according to claim 1, characterized in that: The crossbeam assembly also includes two limit frames, which are respectively arranged directly above the two ends of the crossbeam. A single limit frame includes a buffer plate and a second spring. The buffer plate is horizontally arranged, the upper end of the second spring is connected to the inner side of the rectangular frame, the lower end of the second spring is connected to the upper side of the buffer plate, and the lower side of the buffer plate is opposite to the crossbeam.

3. The expansion joint structure of a bridge according to claim 2, characterized in that: The axial direction of the second spring is arranged along the radial direction of the cross beam.

4. The expansion joint structure of a bridge according to any one of claims 1 to 3, characterized in that: A water-retaining and dust-proof belt is arranged between the middle beam and the side beam, and the water-retaining and dust-proof belt is made of rubber.

Images