Pier-beam seismic connection device and bridge

Abstract

The present invention belongs to the technical field of bridge engineering, and specifically provides a pier-beam seismic connection device and a bridge, including an upper steel plate for connecting with a main beam and a lower steel plate for connecting with a pier, the upper steel plate and the lower steel plate are fixedly connected by a plurality of vertical steel plates, two adjacent vertical steel plates and the upper steel plate and the lower steel plate are respectively enclosed to form a plurality of separate semi-enclosed spaces that are connected front to back, one of the two adjacent semi-enclosed spaces is filled with a cement-based composite material structure, and the two vertical steel plates in the other semi-enclosed space are welded and connected by a transverse partition. The device has a strong vertical connection stiffness and a weak horizontal connection stiffness, and can prevent a large horizontal force from being transmitted to the bridge piers and causing damage to the bridge piers on the basis of realizing vertical force transmission; on the other hand, by utilizing the strain strengthening characteristics of ECC and the plastic deformation capacity of the thin steel plate, the kinetic energy of the piers and beams under the action of an earthquake can be fully absorbed to prevent damage to the piers and beams in a strong earthquake.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a pier-beam seismic resistant connection device and a bridge. Background Art

[0002] In existing continuous bridges with superstructures, beams and piers are generally connected by bearings or pier-beam consolidation. Bearing connection means continuous beams, which have large negative bending moments at the support points. In earthquake zones, expensive seismic bearings are required to prevent bearing damage and main beam displacement. Pier-beam consolidation means rigid frame bridges, which can reduce the main beam bending moment and control the main beam displacement to a certain extent. However, the pier-beam consolidation point is easily damaged in earthquakes because it shares a large bending moment. When bridges are connected by piers and beams, they usually have better mechanical properties and economy. However, in high-intensity earthquake zones, the pier-beam consolidation point often becomes a weak link in earthquake damage, and its seismic resistance and repairability after earthquake damage need to be improved. Once damaged, repair is quite difficult. Summary of the invention

[0003] The purpose of the present invention is to overcome the problems of poor earthquake resistance and difficulty in repair of the beam-pier connection structure in the prior art.

[0004] To this end, the present invention provides a pier-beam seismic connection device, including an upper steel plate for connecting to a main beam and a lower steel plate for connecting to the pier, the upper steel plate and the lower steel plate are fixedly connected by a plurality of vertical steel plates, and two adjacent vertical steel plates and the upper steel plate and the lower steel plate respectively enclose a plurality of separate front-to-back semi-enclosed spaces, one of the two adjacent semi-enclosed spaces is filled with a cement-based composite material structure, and the two vertical steel plates of the other semi-enclosed space are welded and connected by a transverse partition.

[0005] Preferably, the device comprises a plurality of vertical steel plates, and both ends of each of the vertical steel plates are respectively welded to the upper steel plate and the lower steel plate.

[0006] Preferably, the upper steel plate is connected to the main beam by anchor bolts, and the lower steel plate is connected to the pier by anchor bolts.

[0007] Preferably, the cement-based composite material structure and the transverse partitions are arranged alternately in each of the semi-enclosed spaces.

[0008] Preferably, the semi-enclosed spaces include at least three.

[0009] Preferably, the two outermost semi-enclosed spaces are filled with a cement-based composite material structure.

[0010] Preferably, the cement-based composite material structure is a cast-in-place structure.

[0011] Preferably, a bolt is provided on the side of the vertical steel plate facing the cement-based composite material structure, and one end of the bolt extends into the cement-based composite material structure.

[0012] The present invention also provides a bridge, comprising a continuous beam and a pier, and also comprising the pier-beam seismic-resistant connecting device as described above, wherein the continuous beam and the pier are fastened to each other by at least one of the pier-beam seismic-resistant connecting devices.

[0013] Beneficial effects of the present invention: The pier-beam seismic connection device and bridge provided by the present invention include an upper steel plate for connecting with the main beam and a lower steel plate for connecting with the pier, the upper steel plate and the lower steel plate are fixedly connected by a plurality of vertical steel plates, two adjacent vertical steel plates and the upper steel plate and the lower steel plate are respectively enclosed to form a plurality of separate semi-enclosed spaces that are connected front to back, one of the two adjacent semi-enclosed spaces is filled with a cement-based composite material structure, and the two vertical steel plates of the other semi-enclosed space are welded and connected by a transverse partition. The device has a strong vertical connection stiffness and a weak horizontal connection stiffness, which can prevent large horizontal forces from being transmitted to the piers and causing damage to the piers on the basis of realizing vertical force transmission; on the other hand, by utilizing the strain strengthening characteristics of ECC and the plastic deformation capacity of thin steel plates, the kinetic energy of the piers and beams under earthquake action can be fully absorbed to prevent damage to the piers and beams in strong earthquakes.

[0014] The new pier-beam connection device has a compact and lightweight structure and low construction cost; it uses anchor bolts to connect the pier and beam respectively, which is easy to install and replace.

[0015] This technical solution is applicable to bridge engineering, especially conventional span rigid frame bridges or continuous beam bridges.

[0016] The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the pier-beam seismic connection device and the bridge of the present invention;

[0018] Figure 2 It is a top view schematic diagram of the pier-beam seismic-resistant connection device and the bridge of the present invention.

[0019] Explanation of the reference numerals: upper steel plate 1, lower steel plate 2, first vertical steel plate 3, second vertical steel plate 4, transverse partition 5, first cement-based composite material structure 6, second cement-based composite material structure 7, anchor hole 8, bolt 9. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0023] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a pier-beam seismic connection device, including an upper steel plate 1 for connecting to a main beam and a lower steel plate 2 for connecting to a pier, wherein the upper steel plate 1 and the lower steel plate 2 are fixedly connected via a plurality of vertical steel plates, and a plurality of separate front-to-back semi-enclosed spaces are enclosed between two adjacent vertical steel plates and the upper steel plate 1 and the lower steel plate 2, respectively, and one of the two adjacent semi-enclosed spaces is filled with a cement-based composite material structure, and the two vertical steel plates of the other semi-enclosed space are welded and connected via a transverse partition 5.

[0024] It can be seen that in a specific engineering application scenario, according to the bridge's own weight, load and earthquake impact stress, the appropriate thickness of the upper steel plate 1 is selected to be not less than 20mm, and the thickness of the lower steel plate 2 is not less than 10mm. The lateral thickness of the cement-based composite material structure is designed under the condition of satisfying the compressive strength, and then the corresponding position between the upper steel plate 1 and the lower steel plate 2 is welded and connected by vertical steel plates, and the vertical steel plates are thinner than the upper steel plate 1 and the lower steel plate 2. The cast-in-place cement-based composite material structure in the semi-enclosed space formed by the thin steel plate and the upper steel plate 1 and the lower steel plate 2 is ECC. Here, the semi-enclosed spaces on both sides are cast-in-place cement-based composite material structures, and the designed thickness of the cement-based composite material structure is 100mm. The two vertical steel plates in the middle semi-enclosed space are welded and connected by a transverse partition 5.

[0025] Specifically, three semi-enclosed spaces are formed between the upper steel plate 1, the lower steel plate 2, the first vertical steel plate 3, and the second vertical steel plate 4. The leftmost semi-enclosed space is used to cast the first cement-based composite material structure 6, the rightmost semi-enclosed space is used to cast the second cement-based composite material structure 7, and the middle semi-enclosed space is welded with a transverse steel plate, thus forming a pier-beam seismic connection device. The upper steel plate 1 is against the beam, and the lower steel plate 2 is against the pier.

[0026] On the one hand, the device transmits vertical stress through ECC, and utilizes the strain strengthening characteristics of ECC and the plastic deformation capacity of thin steel plates to fully absorb the kinetic energy of piers and beams under earthquake action, and prevent damage to piers and beams in strong earthquakes; on the other hand, the transverse diaphragm 5, which has a relatively weak horizontal connection stiffness compared to the high-strength vertical ECC, can prevent large horizontal forces from being transmitted to the bridge piers and causing damage to the bridge piers on the basis of achieving vertical force transmission. Among them, the transverse diaphragm 5 is a steel plate, and the transverse displacement stress can be dispersed by adjusting the thickness of the vertical steel plate, the thickness and number of the transverse diaphragm 5, so as to adjust the command performance of the seismic device. It is ensured that under the action of large impact forces such as earthquakes, the bridge will produce a certain horizontal displacement, and the device itself can absorb the horizontal displacement, so that the horizontal displacement is reduced and will not be transmitted to the piers, thereby improving the lateral connection flexibility between the beams and piers.

[0027] The device has the following advantages:

[0028] 1) The device is made of a combination of steel and engineered cementitious composite (ECC), which has good vertical support capacity, certain horizontal deformation capacity and bending resistance, so that the bridge structure is reasonably stressed.

[0029] 2) By utilizing the good plasticity of steel plates and ECC, the material properties can be used to fully consume the seismic energy when the bridge encounters a strong earthquake, so that the earthquake damage occurs within the device and does not extend to the main structure.

[0030] 3) The device adopts a detachable structure, which can be used for the reconstruction of existing bridges on the one hand, and can be quickly replaced after earthquake damage on the other hand.

[0031] 4) The device has a simple and compact structure. Multiple devices can be installed on one pier to fully adapt to changes in bridge type and span.

[0032] 5) By changing the thickness of the thin steel plate and the number of the middle transverse partitions 5, the command performance of the seismic device can be easily adjusted, the formation timing of the plastic hinge can be controlled, and the overall safety of the structure can be ensured.

[0033] In a preferred solution, the device comprises a plurality of vertical steel plates, and both ends of each of the vertical steel plates are respectively welded to the upper steel plate 1 and the lower steel plate 2. It can be seen that there can be two or more vertical steel plates, so that at least three semi-enclosed spaces are formed, and ECC can be cast in the semi-enclosed spaces or the transverse partitions 5 can be welded, and it is only necessary to ensure that the ECC is cast in the semi-enclosed space closest to the outside.

[0034] In a preferred solution, the upper steel plate 1 is connected to the main beam by anchor bolts, and the lower steel plate 2 is connected to the pier by anchor bolts. The device is detachably connected to the beam and the pier by anchor bolts. During the construction process, the lower steel plate 2 is first connected to the pier. Specifically, the lower steel plate 2 is provided with an anchor hole 8, which can be connected by anchor bolts. Generally, the lower steel plate 2 is connected to the pre-buried screws of the pier by anchor bolts to complete the detachable connection. Then the vertical steel plate and the transverse partition 5 are welded, and finally the ECC is poured. Then the upper steel plate 1 is welded to close it, and then the upper beam is covered. The upper steel plate 1 is provided with an anchor hole 8, and the upper steel plate 1 is connected to the main beam by anchor bolts. Anchor bolts are used to connect to the pier and the beam respectively. Screws are pre-buried in the pier and the beam to complete the anchor connection, which is easy to install and replace.

[0035] In a preferred solution, the cement-based composite material structure and the transverse partition 5 are alternately arranged in each of the semi-enclosed spaces. It can be seen that when there are more semi-enclosed spaces, multiple ECCs can be cast according to strength requirements, but the ECCs need to be separated, so the semi-enclosed space between two adjacent ECCs can be welded with a transverse partition 5.

[0036] In a preferred solution, the semi-enclosed spaces include at least three. When there are three semi-enclosed spaces, the two semi-enclosed spaces at the edge can be cast with ECC, and a transverse steel plate can be welded in the middle. When there are more semi-enclosed spaces, the two semi-enclosed spaces at the edge can be filled with a cement-based composite material structure. It is sufficient to ensure that there is ECC at the edge to improve the overall strength and stability.

[0037] In a preferred solution, the cement-based composite material structure is a cast-in-place structure. It can be a cast-in-place structure or a prefabricated structure. In order to facilitate construction, a cast-in-place structure is generally used.

[0038] In a preferred embodiment, a bolt 9 is provided on the side of the vertical steel plate facing the cement-based composite material structure, and one end of the bolt 9 extends into the cement-based composite material structure. Figure 1 As shown, three bolts 9 are embedded in the vertical steel plate before pouring the ECC. The bolts 9 are used to make the connection between the vertical steel plate and the ECC more secure.

[0039] In a preferred solution, the thickness of the upper steel plate 1 is greater than that of the lower steel plate 2. The upper steel plate 1 is thicker than the lower steel plate 2 because the upper steel plate 1 is subjected to the most original force, which includes impact force and lateral stress. The stress is relatively complex and rapid, so a thicker steel plate is required to meet the stress. The stress transmitted to the lower steel plate 2 through ECC is relatively gentle, so the thickness can be appropriately reduced to save materials.

[0040] The embodiment of the present invention further provides a bridge, comprising a continuous beam and a pier, and also comprising the pier-beam seismic connection device as described above, wherein the continuous beam and the pier are fastened and connected by at least one of the pier-beam seismic connection devices. Multiple pier-beam seismic connection devices can be installed at each connection, and the installation can be carried out according to the actual engineering needs. The pier-beam seismic connection device is connected to the continuous beam and the pier by anchor bolts, and is detachable, which is convenient for replacement and maintenance.

[0041] Beneficial effects of the present invention: The pier-beam seismic connection device and bridge provided by the present invention include an upper steel plate for connecting with the main beam and a lower steel plate for connecting with the pier, the upper steel plate and the lower steel plate are fixedly connected by a plurality of vertical steel plates, two adjacent vertical steel plates and the upper steel plate and the lower steel plate are respectively enclosed to form a plurality of separate semi-enclosed spaces that are connected front to back, one of the two adjacent semi-enclosed spaces is filled with a cement-based composite material structure, and the two vertical steel plates of the other semi-enclosed space are welded and connected by a transverse partition. The device has a strong vertical connection stiffness and a weak horizontal connection stiffness, which can prevent large horizontal forces from being transmitted to the piers and causing damage to the piers on the basis of realizing vertical force transmission; on the other hand, by utilizing the strain strengthening characteristics of ECC and the plastic deformation capacity of thin steel plates, the kinetic energy of the piers and beams under earthquake action can be fully absorbed to prevent damage to the piers and beams in strong earthquakes.

[0042] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are the same or similar to the present invention fall within the protection scope of the present invention.

Claims

1. A pier-beam seismic connection device, characterized in that: It comprises an upper steel plate for connecting with a main beam and a lower steel plate for connecting with a pier, wherein the upper steel plate and the lower steel plate are fixedly connected via a plurality of vertical steel plates, and two adjacent vertical steel plates are respectively enclosed with the upper steel plate and the lower steel plate to form a plurality of separate semi-enclosed spaces that pass through from front to back, wherein one of the two adjacent semi-enclosed spaces is filled with a cement-based composite material structure, and the two vertical steel plates of the other semi-enclosed space are welded and connected via a transverse partition; the device comprises a plurality of vertical steel plates, and the two ends of each of the vertical steel plates are respectively welded and connected to the upper steel plate and the lower steel plate; the upper steel plate is connected to the main beam by anchor bolts, and the lower steel plate is connected to the pier by anchor bolts.

2. The pier-beam seismic connection device according to claim 1, characterized in that: The cement-based composite material structure and the transverse partitions are arranged alternately in each of the semi-enclosed spaces.

3. The pier-beam seismic connection device according to claim 1, characterized in that: The semi-enclosed spaces include at least three.

4. The pier-beam seismic connection device according to claim 3, characterized in that: The two outermost semi-enclosed spaces are filled with a cement-based composite material structure.

5. The pier-beam seismic connection device according to claim 1, characterized in that: The cement-based composite material structure is a cast-in-place structure.

6. The pier-beam seismic connection device according to claim 1, characterized in that: A bolt is provided on the side of the vertical steel plate facing the cement-based composite material structure, and one end of the bolt extends into the cement-based composite material structure.

7. A bridge comprising a continuous beam and a pier, characterized in that: It also includes the pier-beam seismic-resistant connection device according to any one of claims 1 to 6, and the continuous beam and the pier are fastened to each other by at least one of the pier-beam seismic-resistant connection devices.

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