CN112095448A - Assembled shock absorbing device for high-speed railway bridge and its application method and replacement method - Google Patents

Abstract

The invention discloses a shock absorbing device for an assembled steel plate shear wall of a high-speed railway bridge. An anti-seismic bearing is arranged at the top center of a prefabricated pier column. The shock absorbing device includes a plurality of groups of shock absorbing units evenly distributed around the anti-seismic bearing. Each group of shock absorbing units includes T-shaped main body, horizontal energy dissipation plate, angle steel, vertical energy dissipation plate, and anchoring members; horizontal energy dissipation plate is symmetrically arranged on the inner side of the wing plate of the T-shaped main body, and angle steel is symmetrically arranged on both sides of the web plate. The corner is located in the angle between the flange and the web of the T-shaped main body, and two rows of anchoring members are arranged on the outside of the flange that are symmetrical about the center plane in the length direction; The horizontal arm and the anchoring member are connected by high-strength bolts and nuts to form an integral part; the two sets of integral parts are arranged relatively symmetrically with the web of the T-shaped main body, on both sides of the web of the two T-shaped main bodies and the angle steel on both sides. Vertical energy dissipation plates are inserted between the vertical arms respectively, and then connected by high-strength bolts and nuts to form a shock absorbing unit.

Description

Assembled shock absorbing device for high-speed railway bridge and its application method and replacement method

technical field

The invention belongs to the field of bridge shock absorption, in particular to an assembled shock absorption device for a high-speed railway bridge, an application method and a replacement method thereof.

Background technique

The direct damage caused by an earthquake to a bridge is the damage and collapse of the bridge structure. The connection node between the bottom of the bridge beam and the top of the pier column is the weak link of the bridge structure and the key link of seismic design.

In recent years, with the continuous development of seismic bearing technology, seismic bearing technologies such as lead-core rubber seismic bearings and pendulum sliding friction bearings have been continuously developed in the engineering practice of bridge earthquake resistance. These bearings bear both vertical gravity and horizontal earthquake load. In order to ensure the safety of the seismic bearing, damping tenons are often installed in the project to dissipate part of the seismic energy and reduce the horizontal displacement of the bearing. However, at present, the damping tenon is often made of cantilevered bar, which has the following defects:

The lateral stiffness provided to the structure is limited, and the seismic contribution is correspondingly limited;

Most of them have complex structures and are often integrally connected to the bridge structure. The construction cost is relatively high, and the dismantling and replacement are difficult and time-consuming, which is not conducive to the rapid recovery of the seismic performance of the bridge structure after earthquakes;

Energy is consumed by bending deformation, and the deformation is not easy to be monitored, which is not conducive to bridge structural health monitoring and damage identification.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a shock absorbing device with simple structure, quick replacement, easy deformation monitoring and strong shock resistance.

The high-speed railway bridge assembled steel plate shear wall shock absorbing device provided by the present invention is provided with an anti-seismic bearing at the top center of the prefabricated pier. Seismic unit, each group of shock absorbing units includes T-shaped main body, horizontal energy dissipation plate, angle steel, vertical energy dissipation plate, and anchoring member; the inner side of the wing plate of the T-shaped main body is symmetrically arranged with horizontal energy dissipation plate, and both sides of the web are symmetrically arranged There is angle steel, the corner of the angle steel is located in the angle between the wing plate and the web plate of the T-shaped main body, and two rows of anchoring members are arranged on the outside of the wing plate that are symmetrical about the center plane in the length direction; The horizontal energy dissipation plate, the horizontal arm of the angle steel and the anchoring member are connected by high-strength bolts and nuts to form an integral part; the two sets of integral parts are arranged relatively symmetrically with the webs of the T-shaped main bodies, and the two sets of integral parts are arranged on the webs of the two T-shaped main bodies. Vertical energy dissipation plates are inserted between the vertical arms of the angle steel on the side and both sides, respectively, and then connected by high-strength bolts and nuts to form a shock-absorbing unit.

In an embodiment of the above technical solution, the anchoring member includes a positioning box body and four anchoring steel bars, the positioning box body is a hollow cuboid formed by welding four side plates and an end plate, and the shape of the anchoring steel bars is L. The horizontal arm of each anchoring steel bar faces outward, and the end of the vertical arm is welded with the corner of the positioning box.

In an embodiment of the above technical solution, a circular hole is formed at the center of the end plate, and the nut is welded at the circular hole.

In an embodiment of the above technical solution, the height of the positioning box is greater than twice the thickness of the nut.

In an embodiment of the above technical solution, the material of the horizontal energy dissipation plate is mild steel or memory alloy.

In an embodiment of the above technical solution, the vertical energy dissipation plate is a flat steel plate or a corrugated steel plate.

The application method of the above-mentioned shock absorbing device provided by the present invention includes the following steps:

(1) When prefabricating the beam body, the anchoring members of each shock absorbing unit are pre-buried at the bottom of the beam body according to the design position, and the anchoring members are fixed with the anchoring steel bars facing upward;

When prefabricating piers, the anchoring members of each damping unit are pre-buried at the top of the piers according to the design positions, and the anchoring members are fixed with the positioning box facing upwards;

(2) Assemble the T-shaped main body, the horizontal energy dissipation plate, the angle steel and the bolts of the shock absorbing unit into a T-shaped integral part, so that the two sides of the web of the T-shaped main body and the vertical arms of the angle steel on the corresponding side are formed for Install the insertion slot of the steel plate, and do not connect the bolts between the vertical arm of the angle steel and the web of the T-shaped main body;

The T-shaped integral parts are connected and fixed with the nuts on the pre-buried anchoring members on the pier column and the beam body through bolts on site;

(3) Insert two energy-dissipating plates into the insertion grooves on the T-shaped integral piece at the top of the pier column, and connect and fix them with bolts and nuts after adjusting the position;

(4) When the beam body is hoisted after the pier column is hoisted, the insertion grooves on the T-shaped integral part at the bottom of the beam body should be aligned with the installed vertical energy dissipation plates on the top of the pier column, and then connected by bolts and nuts. tight.

The method for replacing the vertical energy-consuming plate of the above-mentioned shock absorbing device provided by the present invention includes the following steps:

(1) Remove the bolts and nuts between the upper side of the vertical energy dissipation plate and the T-shaped main body and the vertical arm of the angle steel, and then remove the bolts and nuts between the lower side of the vertical energy dissipation plate and the T-shaped main body and the vertical arm of the angle steel. Remove the bolts and nuts, so that the vertical energy dissipation plate is in a free state;

(2) Pull out the vertical energy dissipation board along the insertion slot;

(3) Insert the replacement plate along the insertion slot and lock it with bolts and nuts.

The invention adopts the method of setting around the anti-seismic support, and then multiple groups of shock-absorbing units are evenly distributed around the anti-seismic support, and the structural components of the shock-absorbing unit are detachably connected by high-strength bolts and nuts, and the anchoring components are in The beam body and pier column are pre-embedded and fixed during factory prefabrication. The T-shaped main body, horizontal energy dissipation plate and angle steel of the shock absorbing unit can be assembled into two T-shaped integral parts by bolts and nuts, and the two T-shaped integral parts are The vertical energy dissipation plate and bolts and nuts are connected and locked. The present invention has the following advantages:

The shock absorption unit is equipped with horizontal energy dissipation plates and vertical energy dissipation panels. Steel plates are used as the main components of the shear resistance function, especially the vertical energy dissipation panels are used as steel plate shear walls. In line with the mechanical properties of the material used, it can use less steel to provide greater shear resistance; vertical energy dissipation panels are used as the first line of defense against earthquakes for daily inspection and replacement after ordinary damage; horizontal energy dissipation panels are used as The second line of defense is used to increase the damping of the structure during large earthquakes to consume seismic energy and greatly improve the seismic capacity of the bridge;

The structural parts of the shock absorption unit are prefabricated in the factory, and high-strength bolts are used to connect the structural parts, which can reduce the unfavorable factors such as unstable quality caused by on-site welding work while ensuring the structural strength and rigidity;

The vertical energy dissipation plate forms a steel plate shear wall, and the upper and lower sides are detachably connected to the T-shaped main body respectively. The vertical energy dissipation plate can be quickly replaced when the bridge structure undergoes large earthquake damage and deformation; When the structure needs to be redesigned and reinforced, the shock absorption device can also be modified by adjusting the type and material properties of the vertical energy dissipation plate, so that the seismic performance of the bridge structure can be improved by modifying the shock absorption device;

The out-of-plane buckling deformation of the vertical energy dissipation panel is obvious. Not only can the actual working conditions be observed through the drone camera, but also digital monitoring can be performed by setting strain gauges along the length of the vertical energy dissipation panel. method for structural health monitoring and damage identification of bridges.

Description of drawings

FIG. 1 is a schematic diagram of a use state of the present invention.

FIG. 2 is a schematic view of FIG. 1 after the beam body is hidden.

FIG. 3 is a schematic structural diagram of a group of shock absorbing units in FIG. 2 .

FIG. 4 is an enlarged schematic cross-sectional view of the transverse center plane of the anchored member in FIG. 3 .

FIG. 5 is an enlarged schematic structural diagram of the anchoring member in FIG. 3 .

FIG. 6 is a schematic diagram of the replacement process of the vertical energy-consuming plate of the shock absorbing unit.

Detailed ways

1 and 2, it can be seen that the high-speed railway bridge assembled steel plate shear wall damping device disclosed in this embodiment includes multiple sets of damping units arranged around the support at the center of the top of the pier column.

It can be seen from Figures 1 to 3 that each group of shock absorbing units includes two groups of T-shaped main bodies 1 and their connected horizontal energy dissipation plates 2, angle steel 3, anchoring members 4 and assembly components of fasteners. The webs of the T-shaped main body are arranged relative to each other, and the vertical energy dissipation plate 5, the angle steel 3 and the fastener are connected to form an I-shaped integral part of the assembly main body structure in cross section.

3 and 4, it can be seen that the top surface of the wing plate of the T-shaped main body 1 is symmetrically connected with two rows of anchoring members 4 about its lengthwise center plane, and the lower side of the wing plate is symmetrically connected with a horizontal energy dissipation plate 2 and an angle steel. 3.

In order to enhance the deformation ability and energy dissipation effect of the horizontal energy dissipation plate 2, the horizontal energy dissipation plate should be made of mild steel with a lower yield point or a high damping material such as a shape memory alloy.

In order to enhance the deformation ability and energy dissipation effect of the vertical energy-dissipating plate, the vertical energy-dissipating plate should be made of metal materials with low yield point.

2 to 5, it can be seen that the anchoring member 4 includes an L-shaped steel bar 41, a connecting plate 42 and an end plate 43. The four L-shaped steel bars 41 are arranged with vertical arms corresponding to four corners of a rectangle and horizontal arms facing outwards. The connecting plates 42 are welded between the tops of the vertical arms of the adjacent L-shaped steel bars, and then the end plates 43 are welded to form an integral piece with a positioning box and anchoring bars at four corners.

High-strength bolts and nuts are used for the fasteners between the structural parts, so corresponding bolt mounting holes need to be opened on the T-shaped main body, horizontal energy dissipation plate, angle steel and vertical energy dissipation plate.

The bolt mounting holes on the T-shaped main body 1, the horizontal energy dissipation plate 2 and the vertical energy dissipation plate 5 are all set as round holes with a diameter slightly larger than the diameter of the bolts. Precise correspondence of hole positions on structural parts. For example, the circular hole on the horizontal energy dissipation plate 2 can be processed and then fixed on the corresponding position on the T-shaped main body 1 by means of a tool, and then the T-shaped main body 1 can be processed according to the hole position on the horizontal energy dissipation plate 2. so that the positions of the circular holes on the two structural parts correspond to each other.

The two arms of angle steel 3 need to be machined with bolt mounting holes. In order to facilitate the connection operation on the construction site and eliminate the cumulative error during installation, the bolt mounting holes of the side arms of the angle steel are set as waist round holes along the length of the angle steel. The width of the hole is slightly larger than the diameter of the bolt.

In addition, in order to further facilitate the connection operation, the positions of the openings on the arms on both sides of the angle steel can be dislocated.

Since the anchoring member 4 of the shock absorbing unit needs to be pre-buried during the factory prefabrication of the beam body and the pier column, the nut of the fastener needs to be welded to the circular hole at the center of the sealing plate during the factory fabrication of the anchor, so as to facilitate the Field bolt installation operations.

After the other structural parts of the shock absorbing unit except the anchoring member 4 are completed in the factory, they can be assembled into a T-shaped main body 1, a horizontal energy dissipation plate 2, and an angle steel 3 through high-strength bolts and nuts. The energy dissipation plate 5 is not assembled and transported to the construction site, but the T-shaped integral part should pay attention to the gap between the vertical arm of the angle steel and the T-shaped main body web to meet the installation size of the vertical energy dissipation plate, so as to facilitate the vertical energy dissipation plate. Smooth installation on site.

The installation steps at the bridge construction site are as follows: First, connect the T-shaped integral parts to the anchoring members 4 embedded in the beam body and the pier column respectively through bolts, and connect the T-shaped integral parts at the top of the pier column through bolts and nuts. Two vertical energy dissipation boards 5; after the pier column is installed, the beam body is hoisted, so that the reserved socket slot on the T-shaped integral piece at the bottom of the beam body is connected to the vertical energy dissipation board that has been connected on the T-shaped integral piece at the top of the pier column. After the insertion is completed, the vertical energy dissipation plate 5 is connected and locked with the T-shaped main body 1 and the angle steel 3 through bolts and nuts. It can be seen from this that the space operation during the butt installation between the pier column and the beam body is simple and fast.

When the seismic intensity is small and the deformation of the vertical 5 reaches the replacement level, it is only necessary to remove the bolts and nuts for installing the vertical energy dissipation plate, and remove the vertical energy dissipation plate from the angle steel vertical arms of the two T-shaped integral parts. Pull it out from the insertion slot between the T-shaped main body web and replace it with a new vertical energy dissipation plate, and then reinstall the bolts and nuts, as shown in Figure 6, which is convenient and quick.

When the seismic intensity is large and the horizontal energy-consuming panels need to be replaced, the vertical energy-consuming panels and angle steel are also replaced at the same time, and the replacement operation is mainly the removal of bolts and nuts.

It can be seen from the above structure and replacement operation of the shock absorbing unit that the present invention has the advantages of factory prefabrication, on-site assembly, convenient detachable connection of high-strength bolts, etc., and through the design of replaceable vertical energy consumption, it not only facilitates the damage of the bridge structure Identification and health monitoring are also beneficial to the replacement of damaged structural components, so that the structure can restart the function, and the double shock absorption design of the vertical energy consumption plate and the horizontal energy consumption plate also enables the present invention to have multiple anti-vibration functions. The seismic capacity is greatly improved.

Specifically, the present invention has the following advantages compared with the damping tenon structure of the prior art:

The shock absorption unit is equipped with horizontal energy dissipation plates and vertical energy dissipation panels. Steel plates are used as the main components of the shear resistance function, especially the vertical energy dissipation panels are used as steel plate shear walls. In line with the mechanical properties of the material used, it can use less steel to provide greater shear resistance; vertical energy dissipation panels are used as the first line of defense against earthquakes for daily inspection and replacement after ordinary damage; horizontal energy dissipation panels are used as The second line of defense is used to increase the damping of the structure during large earthquakes to consume seismic energy and greatly improve the seismic capacity of the bridge;

The structural parts of the shock absorption unit are prefabricated in the factory, and high-strength bolts are used to connect the structural parts, which can reduce the unfavorable factors such as unstable quality caused by on-site welding work while ensuring the structural strength and rigidity;

The vertical energy dissipation plate forms a steel plate shear wall, and the upper and lower sides are detachably connected to the T-shaped main body respectively. The vertical energy dissipation plate can be quickly replaced when the bridge structure undergoes large earthquake damage and deformation; When the structure needs to be redesigned and reinforced, the shock absorption device can also be modified by adjusting the type and material properties of the vertical energy dissipation plate, so that the seismic performance of the bridge structure can be improved by modifying the shock absorption device;

The out-of-plane buckling deformation of the vertical energy dissipation panel is obvious. Not only can the actual working conditions be observed through the drone camera, but also digital monitoring can be performed by setting strain gauges along the length of the vertical energy dissipation panel. method for structural health monitoring and damage identification of bridges.

Claims (8)

1. The utility model provides a high-speed railway bridge assembled steel sheet shear force wall damping device, the top central point department of putting of prefabricated pier stud is provided with shock-resistant support, its characterized in that: the device comprises a plurality of groups of damping units which are uniformly distributed around the anti-seismic support, wherein each group of damping units comprises a T-shaped main body, a horizontal energy dissipation plate, angle steel, a vertical energy dissipation plate and an anchoring member;

the inner sides of wing plates of the T-shaped main body are symmetrically provided with horizontal energy dissipation plates, two sides of a web plate are symmetrically provided with angle steels, the corner parts of the angle steels are positioned in an included angle between the wing plates and the web plate of the T-shaped main body, and the outer sides of the wing plates are provided with two rows of anchoring components which are symmetrical about the central plane of the wing plates in the length direction;

the wing plate, the horizontal energy dissipation plate, the horizontal arm of the angle steel and the anchoring member of the T-shaped main body are connected through high-strength bolts and nuts to form an integral part;

two sets of whole pieces are arranged with the web of T type main part symmetry relatively, insert respectively between the vertical arm of the web both sides of two T type main parts and both sides angle steel behind the vertical power consumption board through high strength's bolt, nut connection formation shock attenuation unit.

2. The damping device for the assembled steel plate shear wall of the high-speed railway bridge, according to claim 1, is characterized in that: the anchor component includes location box body and four anchor reinforcing bars, and the location box body is the hollow cuboid that forms by four blocks of curb plates and an end plate welding, and the shape of anchor reinforcing bar is the L type, and the horizontal arm of each anchor reinforcing bar is outside, the terminal of vertical arm welds with the bight of location box body.

3. The damping device for the assembled steel plate shear wall of the high-speed railway bridge, according to claim 2, is characterized in that: and a round hole is formed in the center of the end plate, and the nut is welded at the round hole.

4. The damping device for the assembled steel plate shear wall of the high-speed railway bridge, according to claim 3, is characterized in that: the height of the positioning box body is larger than twice of the thickness of the nut.

5. The damping device for the assembled steel plate shear wall of the high-speed railway bridge, according to claim 1, is characterized in that: the horizontal energy dissipation plate is made of mild steel or memory alloy.

6. The damping device for the assembled steel plate shear wall of the high-speed railway bridge, according to claim 1, is characterized in that: the vertical energy dissipation plate is a flat steel plate or a corrugated steel plate.

7. A method of using the shock absorbing device of claim 1, comprising the steps of:

(1) when the beam body is prefabricated, the anchoring components of the damping units are embedded at the bottom of the beam body according to the design position, and the anchoring components are fixed upwards by anchoring steel bars;

when the pier stud is prefabricated, the anchoring components of all the damping units are embedded in the top of the pier stud according to the designed position, and the anchoring components are fixed upwards by the positioning box body;

(2) assembling a T-shaped main body, a horizontal energy consumption plate, angle steel and bolts of the damping unit into a T-shaped integral piece, so that inserting grooves for installing steel plates are formed between two sides of a web plate of the T-shaped main body and vertical arms of the angle steel on the corresponding side respectively, and the vertical arms of the angle steel are not connected with the bolts between the web plate of the T-shaped main body;

the T-shaped integral part is respectively connected and fixed with nuts on anchoring components pre-embedded on the pier column and the beam body through bolts on site;

(3) inserting two energy dissipation plates into the insertion groove on the T-shaped integral part at the top of the pier stud, and adjusting the positions of the two energy dissipation plates and then fixing the energy dissipation plates through bolts and nuts;

(4) when the pier stud is hoisted and the rear beam body is hoisted, the insertion grooves on the T-shaped integral piece at the bottom of the beam body are respectively aligned and inserted with the vertical energy dissipation plates installed at the top of the pier stud, and then the vertical energy dissipation plates are connected and locked through bolts and nuts.

8. A method for replacing the vertical dissipative plate of the damping device according to claim 7, comprising the steps of:

(1) dismounting bolts and nuts between the upper side of the vertical energy dissipation plate and the T-shaped main body and the angle steel vertical arm, and then dismounting bolts and nuts between the lower side of the vertical energy dissipation plate and the T-shaped main body and the angle steel vertical arm to enable the vertical energy dissipation plate to be in a free state;

(2) drawing out the vertical energy dissipation plate along the insertion groove;

(3) and the replacement plate is inserted along the insertion groove and then is connected and locked through the bolt and the nut.

Images