CN109024316B - Bridge body lifting system installed on bridge pier - Google Patents

Abstract

The invention discloses a bridge girder body lifting system installed on a bridge pier, which comprises a bridge pier fixing device and a lifting assembly, wherein a horizontal supporting platform is formed on the upper surface of the bridge pier fixing device, the lifting assembly comprises upward jacks which are arranged on the supporting platform along the circumferential direction of the bridge pier, and the lifting system is characterized in that the lifting assembly also comprises a horizontal annular force-equalizing ring, the force-equalizing ring is sleeved outside a support at the upper end of the bridge pier, the upper surface of the force-equalizing ring is a jacking force-applying surface connected with the bridge, and the lower surface of the force-equalizing ring is a jacking force-applying surface connected with the upper end of the jack. The invention is specially used for the integral beam body lifting system of the bridge with the lower structure without the capping beam, has simple structure, good fixing effect and stability and convenient construction, can better realize synchronous jacking and protect the safety of construction.

Description

A bridge beam lifting system installed on a bridge pier

technical field

The invention relates to the field of highway bridge engineering, in particular to a bridge beam body lifting device installed on the top of a pier.

Background technique

At present, most of the bridges in service in my country (especially the curved continuous box girder bridges) will experience different degrees of expansion joint damage after several years of use, such as shear damage, bulging on both sides, etc. In addition, a large number of bridges Certain longitudinal and lateral displacements will occur under various dynamic effects (such as earthquakes, vehicle-vessel collision, etc.), and also under some static forces (such as expansion joints stuck, temperature effects, eccentricity of static and dynamic loads, etc.) Generates displacement in any direction and accumulates gradually over time. These bridges with beam deviation have seriously threatened the safety of road operation. In addition, it is very necessary to lift them as a whole, replace the bearings or reset them laterally, so as to fundamentally solve the problem.

For the research on the overall lifting equipment of the bridge, the PLC synchronous jacking method is often used in China, but a lot of engineering practice shows that this method still has some problems. If a certain jack leaks or is damaged, the result is that the construction is not carried out according to the synchronous jacking, which often causes greater stress, and even causes the accident of the bridge being destroyed and killed. Therefore, how to design a method that can better achieve synchronous jacking, minimize the local stress at the jacking position, and ensure the safety in the construction process has become a problem to be considered and solved.

CN201520232817 discloses a support for lifting a highway bridge. It is a device for realizing bridge jacking based on the installation of bridge piers. Specifically, two arc-shaped fixing pieces along the circumference of the bridge pier are used. The support platform realizes the jacking support of the jack.

The solution of the above-mentioned patent can realize the jack installation based on the structural form of the bridge pier. But there are still the following defects: 1. In the process of jacking, there is excessive stress concentration at the action position of the jack, which leads to the possibility of partially jacking the beam itself, the jacking support effect is poor, and the jacking synchronization is relatively poor. Difference. 2. In the fixed structure, the two arc-shaped fixed pieces are directly attached to the circumferential surface of the bridge pier, and then the pressure generated by the screw forcibly buckles and deforms to realize the tightening, so that the friction force can easily offset the deformation force, and then The pressing effect is reduced, and the stability of the device itself is poor.

SUMMARY OF THE INVENTION

In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is: how to provide an installation with a simple structure, which can avoid excessive local stress at the jacking position, improve the jacking synchronization, and improve the fixing reliability and device stability. Bridge girder lift system on piers.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions:

A bridge beam lifting system installed on a bridge pier, comprising a bridge pier fixing device and a lifting component, the bridge pier fixing device includes two oppositely arranged fixing pieces, the fixing pieces are arranged vertically and have an arc shape in the horizontal direction, and the fixing pieces are along the circumference of the bridge pier. The bridge pier fixing device also includes fastening bolts arranged horizontally corresponding to the position of the gap between the two fixing pieces and used to generate the fastening and deformation of the fixing pieces. A horizontal support platform is formed on the upper surface of the fixing device, and the lifting assembly includes upward jacks arranged on the support platform along the circumferential direction of the bridge pier. Outside the support at the upper end of the bridge pier, the upper surface of the equalizing ring is the jacking force application surface connected to the bridge, and the lower surface of the equalizing ring is the jacking force receiving surface connected to the upper end of the jack.

In this way, after the force equalization ring is set, the lifting force surface of the bridge is enlarged, and the lifting force of the jack can be transmitted upward to the lower surface of the bridge evenly and reliably, which improves the synchronization of the lifting, and at the same time, it can reduce the local comparison. The large jacking load is dispersed on the entire working surface, which effectively reduces the local stress, prevents the occurrence of local compression damage on the bottom surface of the beam, and improves the jacking effect and stability.

Further, the force equalizing ring is obtained from two semi-circular annular stiffening plates, the ends of the stiffening plates have vertical edges for docking, and the vertical edges are provided with stiffening plate connecting bolts to connect the two stiffening plates as Equilibrium ring.

In this way, the force-equalizing ring does not need to be installed into the pier during bridge construction, and it is more convenient to install the force-equalizing ring when the device needs to be installed.

Further, the stiffening plate is made of boiling steel. It has low cost and good strength, and can better ensure the synchronization of jacking.

Further, the stiffening plate and its vertical edges are an integral steel plate. This is not welded, so as to reduce the residual stress and residual deformation of the welding and ensure the flatness of the stiffening plate.

Further, the lower surface of the stiffening plate is provided with a number of stiffening ribs arranged in the diametrical direction, the stiffening ribs are evenly arranged in the circumferential direction, and the stiffening ribs have a certain width so that the contact area between the upper end of a single stiffening rib and the stiffening plate is larger than the end face area of the upper end of the jack.

In this way, the stiffener can improve the rigidity of the stiffening plate itself, reduce the deformation, and can also act as a force transition between the jack and the stiffening plate, so that the jacking force of the jack can be distributed more evenly to the stiffening plate, so as to better improve the lifting force. Lifting force stability.

Further, a steel backing plate is correspondingly provided at the position where the top surface of the jack is in contact with the stiffening ribs, and the upper surface of the steel backing plate is in contact with at least two stiffening ribs.

In this way, the upper end face of each jack can be in contact with at least two stiffeners, so that the force is more uniform, and the overall stability of the lifting force is better guaranteed.

Further, the stiffening rib is obtained by welding the steel bar to the bottom surface of the stiffening plate.

This ensures the strength between the stiffener and the steel plate.

Further, in the bridge pier fixing device, a plurality of force-applying ribs extending horizontally outward in the diametrical direction are arranged on the outer peripheral surface of the fixing piece in the circumferential direction, and the outer ends of the force-applying ribs corresponding to the two fixing pieces are respectively connected to one. The inner side of the arc-shaped fastening sleeve, the two ends of the two fastening sleeves are provided with fastening connecting plates for butt-joint extending outward in the diameter direction, and a space for deformation is left between the opposite fastening connecting plates , the fastening bolts are fixedly connected between every two opposite fastening connection plates.

In this way, when the bridge pier fixing device is used, the tightening bolt first drives the tightening sleeve to produce inward compression deformation, and then relies on the force application rib to convert the compression deformation force into a diametrically applied force on the fixed piece. The inward pressure causes the fixing piece to be tightly fixed on the circumferential surface of the bridge pier. Compared with the method in which the fastening bolt is directly connected to the end of the fixed piece in the prior art, this structure relies on the fastening bolt to directly pull the fixed piece to fasten and deform and fit on the circumferential surface of the bridge pier, so that the fixed piece Its own deformation will be hindered by friction, which reduces the deformation and compression effect. At the same time, due to the inconsistent deformation effect, the size and direction of the inward compression force of the fixed piece will be unevenly distributed. If it is sufficient, the pressing force is greater, and the pressing force of the fixing piece away from the position of the fastening bolt is smaller. In this bridge pier fixing device, a suspended fastening sleeve is added, and the fastening sleeve is pulled and deformed by the fastening bolts, and then is converted into an inward pressing force on the fixed piece in the diameter direction by the force rib. In this way, the fixed piece is pressed by the force rib and then pressed to the circumferential surface of the bridge pier, so that the force is applied inward along the diameter direction, and the force direction is more balanced and consistent. At the same time, since the fastening sleeve is arranged in a space, its deformation is not limited by friction, so the fastening bolt can make the fastening sleeve better deform inwardly, thereby making the fastening bolt in the case of the same tightening amount. , which can produce a larger and more uniform inward pressing force on the fixed piece. Greatly improves the tightening effect and improves the stability of the device. In addition, the structure is also more conducive to the formation of a support platform above the fixing device, and is conducive to the installation and support of the jack.

Further, the fastening bolts are high-strength bolts. This can better improve the bolt tightening force.

Further, the fixing piece, the force-applying rib, the fastening sleeve and the fastening connecting plate are all made of steel material. This ensures better strength.

Further, the thickness of the fastening sleeve is greater than the thickness of the fixing sheet. In this way, the smaller thickness of the fixing plate is beneficial to better increase the friction force, and the larger thickness of the fastening sleeve is beneficial to better relying on the deformation to provide the pressing force. The device can better make the device can firmly grasp the top of the pier pier, provide a good frictional reaction force for the working platform to prevent sliding during the jacking construction, and at the same time, it can better make the concrete on the top of the pier bear the three-way restraint state. , to prevent damage to the concrete on the top of the pier.

Further, the fastening connecting plate and the fastening sleeve are obtained by integral casting. The integrity can be better improved.

Further, the force-applying rib, the outer surface of the fixing piece and the inner surface of the fastening sleeve are fixed by welding. This is more convenient for construction and manufacturing and reduces manufacturing costs.

Further, the force-applying rib is a vertical plate-like structure, and the upper end of the force-applying rib and the upper end of the fastening sleeve are on the same horizontal plane. This is more convenient for the structure and bearing capacity of the support platform at the upper end of the pier fixing device.

Further, the upper surface of the force-applying rib and the upper end surface of the fastening sleeve is also supported and provided with a support ring plate which is in the shape of a horizontal ring as a whole, and the upper surface of the support ring plate constitutes a support platform and is used for installing the jack.

In this way, relying on the support ring plate to form the support platform can better facilitate the installation and load bearing of the jack, and improve the overall stability of the device.

Further, the support ring plate is made of steel material. This ensures better strength and stability.

Further, the supporting ring plate is obtained by connecting the two arc-shaped half-ring plates by connecting them with connecting bolts. This makes installation easier.

To sum up, the present invention is specially used for the overall lifting system of the beam body of the bridge without the cover beam in the lower structure, and has the advantages of simple structure, good fixing effect and stability, convenient construction, better synchronous lifting, and the ability to make the jack work. The local stress at the location is minimized to ensure the safety of the overall lifting equipment during the construction process. It can effectively improve the effect of jacking construction and protect the safety of construction.

Description of drawings

FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present invention.

FIG. 2 is a top view of the fixing portion of the single pier of FIG. 1, without the support ring plate.

FIG. 3 is a schematic top view of the structure of the single stiffening plate in FIG. 1 .

Detailed ways

The present invention will be further described in detail below with reference to the embodiments and accompanying drawings.

Preferred embodiment: As shown in Figures 1 to 3, a bridge beam body lifting system installed on a bridge pier includes a bridge pier fixing device and a lifting assembly, and the bridge pier fixing device includes two oppositely arranged fixing pieces 1, the fixing piece. 1. Vertically arranged and arc-shaped in the horizontal direction, the fixing piece 1 is abutted and fixed along the circumferential surface of the bridge pier 2, and there is a gap for deformation between the two fixing pieces 1. The pier fixing device also includes corresponding two fixing pieces Fastening bolts 3 arranged horizontally at the gap position for generating the fastening deformation of the fixing plate, a horizontal support platform is formed on the upper surface of the bridge pier fixing device, and the lifting assembly includes an upward jack 4 arranged on the support platform along the circumference of the bridge pier, wherein , the lifting assembly also includes a force-equalizing ring 5 that is in the shape of a horizontal ring as a whole. The force-equalizing ring 5 is set outside the support at the upper end of the bridge pier. The lower surface of the ring 5 is a jacking force-bearing surface connected to the upper end of the jack 4 .

In this way, after the force equalization ring is set, the lifting force surface of the bridge is enlarged, and the lifting force of the jack can be transmitted upward to the lower surface of the bridge evenly and reliably, which improves the synchronization of the lifting, and at the same time, it can reduce the local comparison. The large jacking load is dispersed on the entire working surface, which effectively reduces the local stress, prevents the occurrence of local compression damage on the bottom surface of the beam, and improves the jacking effect and stability.

The force equalizing ring 5 is obtained from two semicircular stiffening plates, the ends of the stiffening plates have vertical edges for butt joint, and the vertical edges are provided with stiffening plate connecting bolts to connect the two stiffening plates as Equalizing Ring 5.

In this way, the force-equalizing ring does not need to be installed into the pier during bridge construction, and it is more convenient to install the force-equalizing ring when the device needs to be installed.

Among them, the stiffening plate is made of boiling steel. It has low cost and good strength, and can better ensure the synchronization of jacking.

Among them, the stiffening plate and its vertical edges are an integral steel plate. This is not welded, so as to reduce the residual stress and residual deformation of the welding and ensure the flatness of the stiffening plate.

Among them, the lower surface of the stiffening plate is provided with a number of stiffening ribs 7 arranged in the diametrical direction, the stiffening ribs 7 are evenly arranged in the circumferential direction, and the stiffening ribs have a certain width so that the contact area between the upper end of a single stiffening rib and the stiffening plate is greater than the end face area of the upper end of the jack.

In this way, the stiffener can improve the rigidity of the stiffening plate itself, reduce the deformation, and can also act as a force transition between the jack and the stiffening plate, so that the jacking force of the jack can be distributed more evenly to the stiffening plate, so as to better improve the lifting force. Lifting force stability.

Wherein, the position where the top surface of the jack contacts with the stiffening ribs is correspondingly provided with a steel backing plate 8, and the upper surface of the steel backing plate 8 is in contact with at least two stiffening ribs.

In this way, the upper end face of each jack 4 can be in contact with at least two stiffening ribs, so that the force is more uniform, and the overall stability of the lifting force is better guaranteed.

Among them, the stiffening rib 7 is obtained by welding a steel bar to the bottom surface of the stiffening plate.

This ensures the strength between the stiffener and the steel plate.

Among them, in the bridge pier fixing device, the outer peripheral surface of the fixing sheet 1 is circumferentially arranged with a plurality of force-applying ribs 9 extending horizontally outward along the diameter direction, and the outer ends of the force-applying ribs 9 corresponding to the two fixing pieces 1 correspond to each other. Connected to the inner side of an arc-shaped fastening sleeve 10, the two ends of the two fastening sleeves 10 have fastening connecting plates for butt joints extending outward in the diameter direction, and the opposite fastening connecting plates are left between them. With space for deformation, the fastening bolts 3 are fixedly connected between every two opposite fastening connecting plates.

In this way, when the bridge pier fixing device is used, the tightening bolt first drives the tightening sleeve to produce inward compression deformation, and then relies on the force application rib to convert the compression deformation force into a diametrically applied force on the fixed piece. The inward pressure causes the fixing piece to be tightly fixed on the circumferential surface of the bridge pier. Compared with the method in which the fastening bolt is directly connected to the end of the fixed piece in the prior art, this structure relies on the fastening bolt to directly pull the fixed piece to fasten and deform and fit on the circumferential surface of the bridge pier, so that the fixed piece Its own deformation will be hindered by friction, which reduces the deformation and compression effect. At the same time, due to the inconsistent deformation effect, the size and direction of the inward compression force of the fixed piece will be unevenly distributed. If it is sufficient, the pressing force is greater, and the pressing force of the fixing piece away from the position of the fastening bolt is smaller. In this bridge pier fixing device, a suspended fastening sleeve is added, and the fastening sleeve is pulled and deformed by the fastening bolts, and then is converted into an inward pressing force on the fixed piece in the diameter direction by the force rib. In this way, the fixed piece is pressed by the force rib and then pressed to the circumferential surface of the bridge pier, so that the force is applied inward along the diameter direction, and the force direction is more balanced and consistent. At the same time, since the fastening sleeve is arranged in a space, its deformation is not limited by friction, so the fastening bolt can make the fastening sleeve better deform inwardly, thereby making the fastening bolt in the case of the same tightening amount. , which can generate a larger and more uniform inward pressing force on the fixed piece. Greatly improves the tightening effect and improves the stability of the device. In addition, this structure is also more conducive to the formation of a support platform above the fixing device, and is conducive to the installation and support of the jack.

Among them, the fastening bolts 3 are high-strength bolts. This can better improve the bolt tightening force.

Wherein, the fixing piece, the force-applying rib, the fastening sleeve and the fastening connecting plate are all made of steel material. This ensures better strength.

Wherein, the thickness of the fastening sleeve 10 is greater than the thickness of the fixing sheet 1 . In this way, the smaller thickness of the fixing plate is beneficial to better increase the friction force, and the larger thickness of the fastening sleeve is beneficial to better relying on the deformation to provide the pressing force. The device can better make the device can firmly grasp the top of the pier pier, provide a good frictional reaction force for the working platform to prevent sliding during the jacking construction, and at the same time, it can better make the concrete on the top of the pier bear the three-way restraint state. , to prevent damage to the concrete on the top of the pier.

Wherein, the fastening connecting plate and the fastening sleeve 10 are obtained by integral casting. The integrity can be better improved.

Wherein, the force-applying rib 9 and the outer surface of the fixing piece 1 and the inner surface of the fastening sleeve 10 are fixed by welding. This is more convenient for construction and manufacturing and reduces manufacturing costs.

The force-applying rib 9 is a vertical plate-like structure, and the upper end of the force-applying rib 9 and the upper end of the fastening sleeve 10 are on the same horizontal plane. This is more convenient for the structure and bearing capacity of the support platform at the upper end of the pier fixing device.

Wherein, the upper surface of the force applying rib 9 and the fastening sleeve 10 is also supported with a support ring plate 11 which is a horizontal ring as a whole, and the upper surface of the support ring plate 11 constitutes a support platform and is used for installing the jack.

In this way, relying on the support ring plate to form the support platform can better facilitate the installation and load bearing of the jack, and improve the overall stability of the device.

Wherein, the support ring plate 11 is made of steel material. This ensures better strength and stability.

Wherein, the support ring plate 11 is obtained by connecting two arc-shaped half-ring plates together with connecting bolts. This makes installation easier.

Claims (8)

1. A bridge beam body lifting system installed on a bridge pier, comprising a bridge pier fixing device and a lifting component, the bridge pier fixing device includes two oppositely arranged fixing pieces, the fixing pieces are vertically arranged and the horizontal direction is arc-shaped, and the fixing pieces are along the The circumferential surface of the bridge pier is butted and fixed tightly, and a gap for deformation is left between the two fixed pieces. The bridge pier fixing device also includes a horizontal arrangement corresponding to the position of the gap between the two fixed pieces. Fastening bolts for generating the fastening deformation of the fixed pieces A horizontal support platform is formed on the upper surface of the bridge pier fixing device, and the lifting assembly includes an upward jack arranged along the circumference of the bridge pier on the support platform. The upper surface of the equalizing ring is the jacking force application surface connected to the bridge, and the lower surface of the equalizing ring is the jacking force receiving surface connected to the upper end of the jack; The force equalizing ring is obtained from two semi-circular stiffening plates, the ends of the stiffening plates have vertical edges for docking, and the vertical edges are provided with stiffening plate connecting bolts to connect the two stiffening plates into a force equalizing ring. ; In the bridge pier fixing device, a plurality of force-applying ribs extending horizontally outward along the diameter direction are arranged on the outer peripheral surface of the fixing piece in the circumferential direction, and the outer ends of the force-applying ribs corresponding to the two fixing pieces are respectively connected to an arc-shaped rib. On the inner side of the fastening sleeve, both ends of the two fastening sleeves are provided with fastening connecting plates for butt-joint formed by extending outward in the diameter direction, and a space for deformation is left between the opposite fastening connecting plates. Fastening bolts are fixedly connected between each two opposite fastening connection plates. 2. The bridge girder lifting system installed on the bridge pier according to claim 1 is characterized in that, the lower surface of the stiffening plate is provided with a plurality of stiffening ribs arranged in the diametrical direction, the stiffening ribs are evenly arranged along the circumferential direction, and the stiffening ribs have A certain width makes the contact area between the upper end of a single stiffening rib and the stiffening plate larger than the end face area of the upper end of the jack. 3. The bridge girder body lifting system installed on the bridge pier as claimed in claim 2, characterized in that, a steel backing plate is correspondingly provided at the position where the top surface of the jack contacts the stiffening rib, and the upper surface of the steel backing plate is at least two stiffeners. rib contact. 4. The bridge beam lifting system installed on the bridge pier according to claim 2, wherein the stiffening rib is obtained by welding a steel bar to the bottom surface of the stiffening plate. 5 . The bridge girder lifting system installed on the bridge pier according to claim 1 , wherein the fixing piece, the force-applying rib, the fastening sleeve and the fastening connecting plate are all made of steel material. 6 . 6 . The bridge girder body lifting system installed on the bridge pier according to claim 5 , wherein the thickness of the fastening sleeve is greater than the thickness of the fixing sheet. 7 . 7. The bridge girder body lifting system installed on the bridge pier according to claim 5, wherein the upper end surface of the force-applying rib and the fastening sleeve is also supported and provided with a support ring plate that is in the form of a horizontal ring as a whole, and the support ring plate The upper surface constitutes a support platform and is used to install the jack. 8 . The bridge girder lifting system installed on the bridge pier according to claim 7 , wherein the support ring plate is obtained by connecting two arc-shaped half ring plates by connecting them with connecting bolts. 9 .

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