CN211645961U

CN211645961U - Flexible main abutment of multistage abutment of whole bridge of removable attenuator

Info

Publication number: CN211645961U
Application number: CN202020045317.8U
Authority: CN
Inventors: 黄福云; 何凌峰; 单玉麟; 刘征峰; 周志明
Original assignee: Fuzhou University
Current assignee: Fuzhou University
Priority date: 2020-01-10
Filing date: 2020-01-10
Publication date: 2020-10-09
Anticipated expiration: 2030-01-10

Abstract

The utility model relates to a flexible main abutment of multistage abutment of whole bridge of removable attenuator, including girder, draw board, the wiring road surface that sets gradually, from last down be equipped with main abutment, rigidity expansion basis in proper order between girder and the draw board, be equipped with secondary abutment between draw board and the wiring road surface, main abutment and rigidity expand between the basis through the prestressing tendons drawknot as an organic whole, be provided with a plurality of attenuator between main abutment peripheral part and the rigidity expansion basis. The self-resetting capability and the anti-overturning capability of the integral bridge abutment under the action of the earthquake are provided by the prestressed tendons. Meanwhile, a damper is arranged between the main bridge abutment and the rigid expansion foundation, the side force resistance is improved by the damper, the earthquake energy is consumed, and the damaged damper after the earthquake can be replaced. The combination of the prestressed tendons and the damper not only has good self-resetting capability, but also has higher energy consumption capability, and can reduce the damage and damage of the abutment to a certain extent. The bridge is suitable for integral bridges with higher requirements on deformation and seismic performance.

Description

Flexible main abutment of multistage abutment of whole bridge of removable attenuator

Technical Field

The utility model relates to a flexible main abutment of multistage abutment of whole bridge of removable attenuator.

Background

The seismic problem of bridges is always the focus of attention in the engineering and academic circles. Although the bridge design specifications of various countries have detailed anti-seismic design methods and requirements, a plurality of bridges still have failure and collapse in every earthquake. China is a multi-earthquake country, and earthquake activities are frequent and high in magnitude. Seismic activity is mainly distributed in southwest, northwest, south China, Taiwan strait and other areas, and bridges are distributed more in these areas. Although the seamless bridge has better earthquake-resistant performance than the seam bridge, the research on the earthquake resistance is still a very important subject.

The upper structure and the lower structure of the integral bridge are connected into a whole, expansion joints, supports and bridge abutments are not arranged, and the integral bridge is characterized by adopting a flexible foundation; the longitudinal bridge deformation of the upper structure is accommodated by the lower structure and the foundation, which is the deformation characteristic of the integral bridge. The whole bridge has higher redundancy, the occurrence of beam falling when earthquake and flood are avoided, and the damage of wing walls and supports is reduced or avoided. In a high-intensity earthquake active area, the whole bridge is undoubtedly a very suitable bridge type. However, even if the earthquake-resistant calculation is carried out on a specific integral bridge, at present, few research reports are available, and only the general bridge earthquake-resistant design method can be used for processing. The reason is that in the dynamic analysis of the whole bridge, a key problem which is how to deal with the interaction between the soil body and the structure, including the anti-seismic action between the platform and the post soil, the pile and the pile soil, and the possible guide plate and the roadbed or the wiring road surface, is not solved well. At the abutment, the abutment deformation depends on the relative stiffness of the abutment, the pile foundations and the decking, and the lateral stiffness of the post-abutment soil and the pile-side soil. Conversely, the response of the post-abutment soil is related to the deformation of the abutment.

Just because the substructure and the superstructure of the integral bridge are connected into a whole, the dynamic characteristics and the earthquake-resistant performance analysis of the integral bridge are different compared with the traditional slotted bridge. The integral bridge has the advantages of good integrity and high redundancy and has certain adverse factors under the action of earthquake. After the main beam and the bridge abutment are connected into a whole, the structural rigidity is increased, the period is reduced, the total seismic shear force is larger than that of the traditional seam bridge, and most of the total seismic shear force is borne by the bridge abutment pile foundation, so that the pile foundation can bear higher seismic action, and the bridge abutment is one of the weakest parts of the whole bridge.

For a transverse bridge, the post-abutment soil basically cannot play a role, and the first-order vibration mode of the whole bridge is generally in the transverse bridge direction, so that the transverse bridge direction damage of a pile foundation and an abutment is more prone to occur under the action of an earthquake. In order to ensure that the abutment has good transverse self-resetting capability and higher energy consumption capability and reduce the transverse damage and damage of the abutment to a certain extent, the flexible main abutment of the integral bridge multistage abutment with the replaceable damper is provided.

SUMMERY OF THE UTILITY MODEL

In view of the deficiencies of the prior art, the technical problem to be solved by the utility model is to provide a flexible main abutment of multistage abutment of whole bridge of removable attenuator.

In order to solve the technical problem, the technical scheme of the utility model is that: the utility model provides a flexible main abutment of multistage abutment of whole bridge of removable attenuator, is including the girder that sets gradually, draw board, wiring road surface, from last main abutment, rigidity expansion basis of down being equipped with in proper order between girder and the draw board, is equipped with the secondary abutment between draw board and the wiring road surface, and main abutment and rigidity expansion are as an organic whole through the prestressing tendons drawknot between the basis, are provided with a plurality of attenuator between main abutment peripheral part and the rigidity expansion basis.

Preferably, the abutment is a main abutment in a multistage abutment structure of the integral bridge, wherein the secondary abutment plays a role of soil retaining, and partial soil or no soil is filled between the main abutment and the secondary abutment.

Preferably, the main bridge abutment is arranged on the rigid expansion foundation, and grooves are formed in the top of the main bridge abutment and the bottom of the rigid expansion foundation.

Preferably, the prestressed tendons adopt unbonded prestressed tendons, unbonded prestressed tendons are arranged in the main bridge abutment, the top ends of the prestressed tendons are anchored in a groove in the top of the main bridge abutment through an anchorage device, and the bottom ends of the prestressed tendons are anchored in a groove in the bottom of the rigid expansion foundation.

Preferably, the bottom surface of the main bridge platform consists of a middle separation plane and rolling inclined planes on two sides.

Preferably, the dampers are symmetrically arranged on both sides of the main bridge abutment in the longitudinal direction and the transverse direction, the top ends of the dampers are anchored on the outer wall of the main bridge abutment, and the bottom ends of the dampers are anchored on the top surface of the rigid expansion foundation.

Compared with the prior art, the utility model discloses following beneficial effect has: the self-resetting capability and the anti-overturning capability of the integral bridge abutment under the action of the earthquake are provided by the prestressed tendons. Meanwhile, a damper is arranged between the main bridge abutment and the rigid expansion foundation, the side force resistance is improved by the damper, the earthquake energy is consumed, and the damaged damper after the earthquake can be replaced. The combination of the prestressed tendons and the damper not only has good self-resetting capability, but also has higher energy consumption capability, and can reduce the damage and damage of the abutment to a certain extent. The bridge is suitable for integral bridges with higher requirements on deformation and seismic performance.

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

Drawings

Fig. 1 is a side view of an embodiment of the present invention.

Fig. 2 is a partially enlarged view a of fig. 1.

Fig. 3 is a front view of the main abutment.

Fig. 4 is a top view of the main abutment.

Detailed Description

In order to make the aforementioned and other features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

As shown in fig. 1-4, the flexible main abutment of the multistage abutment of the whole bridge with the replaceable damper comprises a main beam 1, a leading plate 3 and a wiring road surface 4 which are sequentially arranged, a main abutment 12 and a rigid expansion foundation 5 are sequentially arranged between the main beam and the leading plate from top to bottom, a secondary abutment 2 is arranged between the leading plate and the wiring road surface, the main abutment and the rigid expansion foundation are integrally connected through a prestressed rib 6, and a plurality of dampers 7 are arranged between the peripheral part of the main abutment and the rigid expansion foundation. The flexibility of the thin-wall abutment body is utilized, and the self-resetting capability and the anti-overturning capability of the integral abutment under the action of the earthquake are provided through the prestressed tendons.

The embodiment of the utility model provides an in, the abutment is the main abutment in the multistage abutment structure of whole bridge, and wherein secondary abutment undertakes the fender soil effect, fills partial soil or does not fill out soil between main, secondary abutment.

The embodiment of the utility model provides an in, the main bridge platform is installed on the rigidity enlarges the basis, and main bridge platform top and rigidity enlarge the bottom on basis and all are equipped with the recess.

The embodiment of the utility model provides an in, prestressing tendons adopts unbonded prestressing tendons, is equipped with unbonded prestressing tendons in the main bridge platform, and 8 anchor in the recess 9 at main bridge platform top are passed through on prestressing tendons top, and the bottom anchor is in the recess of rigidity expansion basis bottom.

In the embodiment of the present invention, the bottom surface of the main bridge platform is composed of a middle separation plane 10 and two rolling slopes 11.

The embodiment of the utility model provides an in, a plurality of attenuator is in the equal symmetrical arrangement of the longitudinal bridge of main abutment to, horizontal bridge to both sides, and attenuator top anchor is in main abutment outer wall, and bottom anchor enlarges basic top surface in the rigidity.

The application of the damper-replaceable integral bridge multistage abutment flexible main abutment is applied to an integral bridge.

The present invention is not limited to the above-mentioned best mode, and any person can derive the flexible main abutment of the whole bridge multistage abutment of the replaceable damper of other various forms under the teaching of the present invention. All the equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.

Claims

1. The utility model provides a flexible main abutment of multistage abutment of whole bridge of removable attenuator which characterized in that: the bridge comprises a main beam, a leading plate and a wiring road surface which are sequentially arranged, wherein a main bridge abutment and a rigidity expansion foundation are sequentially arranged between the main beam and the leading plate from top to bottom, a secondary bridge abutment is arranged between the leading plate and the wiring road surface, the main bridge abutment and the rigidity expansion foundation are integrated through a prestressed tendon, and a plurality of dampers are arranged between the peripheral part of the main bridge abutment and the rigidity expansion foundation.

2. The replaceable damper, integral bridge multistage abutment flexible main abutment of claim 1, wherein: the bridge abutment is a main bridge abutment in the integral bridge multistage bridge abutment structure, wherein the secondary bridge abutment plays a role in retaining soil, and partial soil or no soil is filled between the main bridge abutment and the secondary bridge abutment.

3. The replaceable damper, integral bridge multistage abutment flexible main abutment of claim 1, wherein: the main bridge abutment is arranged on the rigid expansion foundation, and grooves are formed in the top of the main bridge abutment and the bottom of the rigid expansion foundation.

4. The replaceable damper, integral bridge multistage abutment flexible main abutment of claim 3, wherein: the prestressed tendons adopt unbonded prestressed tendons, unbonded prestressed tendons are arranged in the main bridge abutment, the top ends of the prestressed tendons are anchored in a groove in the top of the main bridge abutment through an anchorage device, and the bottom ends of the prestressed tendons are anchored in a groove in the bottom of the rigid expansion foundation.

5. The replaceable damper, integral bridge multistage abutment flexible main abutment of claim 1, wherein: the bottom surface of the main bridge abutment consists of a middle separation plane and rolling inclined planes on two sides.

6. The replaceable damper, integral bridge multistage abutment flexible main abutment of claim 5, wherein: the dampers are symmetrically arranged on both sides of the longitudinal bridge direction and the transverse bridge direction of the main bridge abutment, the top ends of the dampers are anchored on the outer wall of the main bridge abutment, and the bottom ends of the dampers are anchored on the top surface of the rigid expansion foundation.