CN220035488U - Novel foundation arch seat that enlarges of truss arched bridge - Google Patents

Abstract

The novel enlarged foundation arch base of truss arch bridge has effectively reduced foundation excavation amount, reduced environmental impact, reduced arch base dead weight, reduced base stress, greatly reduced masonry amount and reduced engineering cost. The bridge comprises an expansion foundation and a base body, wherein the base body is arranged at intervals along a transverse bridge and is fixedly combined with the expansion foundation into a whole, a boundary pier is fixedly connected with the base body at the top surface of the base body, and an arch ring chord member is fixedly connected with the base body at the front inclined surface of the base body.

Description

Novel foundation arch seat that enlarges of truss arched bridge

Technical Field

The utility model relates to the technical field of bridge engineering, in particular to an arch base foundation structure of a large-span truss arch bridge in a region with poor geological conditions.

Background

The arch bridge has various structural forms, attractive appearance, high rigidity and other characteristics, is one of the main bridge types in China for a long time, is still largely built in China even in the period of 40 years of large construction with increasingly abundant bridge types, and achieves the achievement of great attention in the aspects of design, construction and the like.

The arch bridge structure has great self weight, and the arch ring is mainly a bearing member, so that when no tie bar is arranged, the arch springing bears larger vertical force and larger horizontal force. Therefore, the arch bridge has higher requirement on the bearing capacity of the foundation, and the large-span arch bridge foundation with thrust usually adopts a large-scale enlarged foundation or a large-scale pile group foundation.

The conventional large-scale enlarged foundation is generally constructed by adopting an open cut foundation method, the size of the foundation is larger, the proportion of the base stress caused by the dead weight to the total base stress is larger, the excavation amount is larger, the construction is convenient, the process is mature, the construction period is shorter, and the foundation is particularly suitable for arch foundations in areas with better geological conditions. The large pile group foundation is a pile foundation formed by a plurality of piles, and the pile foundation has a large pile foundation number, so that the pile cap of the pile group foundation has a large size, the distance between pile foundation front edges and the embedded depth of the pile cap are ensured, the excavation amount of the large pile group foundation is large, and the construction cost is relatively high.

In summary, constructing an arch bridge in a region with better geological conditions, the expansion foundation is still the first choice of the arch base foundation according to the economy and construction convenience of the expansion foundation, but the conventional expansion foundation is adopted in a region with poorer geology, because the base stress is larger, the arch base size is often required to be increased, the arch base dead weight is increased after the arch base size is increased, and the base stress is further increased, so that the arch base of the expansion foundation loses the competitive advantage. Therefore, it is necessary to create a new type of enlarged foundation abutment for use in poor geological conditions to solve the problems of large excavation and masonry of the enlarged foundation abutment.

Disclosure of Invention

The utility model aims to solve the technical problems of expanding a foundation arch base of a truss arch bridge, so as to effectively reduce the foundation excavation amount, reduce the influence on the environment, lighten the arch base dead weight and reduce the substrate stress, greatly reduce the masonry amount and save the engineering cost. The technical scheme adopted for solving the technical problems is as follows:

the utility model relates to a novel expansion foundation arch base of a truss arch bridge, which comprises an expansion foundation and a base body, and is characterized in that: the seats are arranged at intervals along the transverse bridge direction and are fixedly combined with the enlarged foundation into a whole, the boundary piers are fixedly connected with the seats on the top surface of the seats, and the arch ring chords are fixedly connected with the seats on the front inclined surfaces of the seats.

The technical scheme provides a novel truss type arch bridge expansion foundation arch base structure, an arch base body is covered, and a foundation is expanded. The method is characterized in that: the beneficial effects of the utility model are mainly shown in the following aspects:

1. the chord members and the juncture piers are fixedly connected with the arch support body, the load is transferred to the enlarged foundation through the arch support body, and finally the load is transferred to the foundation, and the transfer path is clear and reasonable;

2. when the foundation is constructed, the traditional open cut method is adopted, the process is mature and simple, the construction risk is low, the construction period is short, and the economy is good;

3. compared with the traditional arch base of the enlarged foundation or the large pile group foundation, the building material is utilized to the greatest extent, the arch base dead weight is reduced, the base stress is reduced, the masonry quantity is greatly reduced, and the foundation excavation quantity is reduced;

the utility model effectively solves the problems of safety and economy of bridge foundation construction in areas with poor geology or higher environmental protection requirements.

Drawings

The specification includes four drawings as follows:

fig. 1 is a perspective view of a novel enlarged base abutment for a truss arch bridge of the present utility model:

FIG. 2 is a side view of a novel enlarged base abutment for a truss arch bridge of the present utility model:

fig. 3 is a general view of a construction of a novel expanded base abutment for a truss arch bridge of the present utility model:

fig. 4 is a schematic diagram of excavation of a novel expanded foundation abutment for a truss arch bridge according to the present utility model:

the components and corresponding indicia are shown: the foundation 10, the base 20, the arch ring chord 30, the boundary pier 40, the ground line D and the arch base contour line B are enlarged.

Detailed Description

The utility model will be further described with reference to the drawings and examples.

Referring to fig. 1 and 2, the novel expanded foundation abutment for a truss arch bridge according to the present utility model includes an expanded foundation 10 and a base 20, wherein the base 20 is disposed at intervals along a transverse bridge direction, and is integrally fixed with the expanded foundation 10, a boundary pier 40 is fixed with the base 20 on the top surface of the base 20, and an arch ring chord 30 is fixed with the base 20 on the front inclined surface of the base 20. The arch ring chord 30 is fixedly connected with the base 20 to transfer arch ring load to the base 20, the junction pier 40 is fixedly connected with the base 20 to transfer junction pier load to the base 20, the base 20 transfers load to the enlarged foundation 10, and finally the enlarged foundation 10 transfers load to the foundation, so that the transfer path is clear and reasonable. In order to make the substrate of the enlarged base 10 uniformly stressed, the edge of the bottom surface of the base 20 is not preferably greater than the thickness of the enlarged base 10 from the edge of the enlarged base 10. The top surface and the front inclined surface of the seat body 20 are required to meet the local bearing cross sections of the boundary piers 40 and the arch ring chords 30, and the inclination angle of the front inclined surface is determined according to the top surface and the bottom surface. According to the stress characteristics of the arch abutment, the size of the arch abutment body is optimized, and the self weight of the arch abutment is reduced, so that the substrate stress is reduced. And the position of the junction pier 40 can be adjusted in a certain range according to the requirement of the main girder span.

Referring to fig. 2, the rear portion of the enlarged base 10 is stepped.

Referring to fig. 4, the arch abutment is excavated by an open cut method, the process is mature, temporary excavation slope rates can be adopted in a foundation height range, permanent excavation slope rates are adopted in a range above the foundation height, and the foundation is not backfilled after excavation so as to reduce the weight of the arch abutment. The foundation arch base is enlarged by adopting the open cut method, the construction process is mature, the operation is simple, the safety risk is small, the construction period is short, and the economy is good.

Referring to fig. 1 to 4, the novel enlarged foundation abutment of the truss arch bridge of the present utility model is implemented as follows:

s1: cleaning the surface of a foundation, making surface intercepting drainage facilities, digging a slope to enlarge the bottom surface of the foundation 10, and performing slope protection within a certain range of the foundation.

S2: after the slope is excavated to the elevation of the substrate, the slope should be sealed in time, and the time interval for pouring the arch abutment concrete is shortened. Before pouring concrete on the arch base foundation, carefully removing the loosened rock blocks, and backfilling the hollow holes with concrete; if the bedrock surface has cracks, grouting and sealing should be performed first.

S3: installing a positioning bracket, binding reinforcing steel bars, and pouring concrete layer by layer according to the sequence of the marks (1) to (7) in fig. 3 (the layer pouring can be adjusted according to actual conditions). The relevant embedded parts should be arranged during pouring.

S4: the interfacing pier 40 and the main arch ring are constructed.

The foregoing is illustrative of the principles of the present utility model for a novel expanded base abutment for a truss arch bridge and is not intended to limit the utility model to the specific structure and application illustrated and described, but rather to cover all modifications and equivalents that may be employed, as long as they are within the scope of the utility model as defined in the appended claims.

Claims (2)

1. The utility model provides a novel foundation arch abutment that enlarges of truss arch bridge, includes enlarged foundation (10) and pedestal (20), characterized by: the seat body (20) is arranged at intervals along the transverse bridge direction, is fixedly connected with the expansion foundation (10) into a whole, the junction pier (40) is fixedly connected with the seat body (20) on the top surface of the seat body (20), and the chord member (30) is fixedly connected with the seat body (20) on the front inclined surface of the seat body (20).

2. A novel enlarged base abutment for a truss arch bridge as defined in claim 1, wherein: the rear part of the expansion foundation (10) is stepped.