CN203320391U

CN203320391U - Deck type arch bridge with prestressed concrete pulling-and-pressing rods arranged between arch springing bearing platforms

Info

Publication number: CN203320391U
Application number: CN2013200949277U
Authority: CN
Inventors: 刘志才; 刘旭锴; 张强; 何铭; 唐颖; 张洪海; 曹景; 戴少雄; 李强; 赵传亮; 赵欣; 乔建刚
Original assignee: Tianjin Municipal Engineering Design and Research Institute
Current assignee: Tianjin Municipal Engineering Design and Research Institute
Priority date: 2013-03-01
Filing date: 2013-03-01
Publication date: 2013-12-04
Anticipated expiration: 2023-03-01

Abstract

The utility model belongs to the technical field of construction of bridges, and relates to a deck type arch bridge with prestressed concrete pulling-and-pressing rods arranged between arch springing bearing platforms. The deck type arch bridge comprises a main arch ring, the bearing platforms, pile foundations and a plurality of prestressed concrete pulling-and-pressing rods, wherein arc springings of the main arch ring are arranged in the bearing platforms; the two ends of a prestress steel strand penetrating through each prestressed concrete pulling-and-pressing rod are respectively anchored into the bearing platforms on the corresponding two sides; the main arch ring, the pile foundations and the prestressed concrete pulling-and-pressing rods are connected into a whole through the bearing platforms. The deck type arch bridge has the advantages as follows: 1, the prestressed concrete pulling-and-pressing rods are concrete members with bonded prestress therein, has no special corrosion prevention problems, and has favorable durability; 2, prestressed steel beams in the prestressed concrete pulling-and-pressing rods can be tensioned in place at one step in construction, and construction channels are not required to be reserved for tensioning step by step; 3, the push-and-pull prevention performance of the arch springings is large in horizontal stiffness, the horizontal displacement of the arch springings is small, and the capacity of the structure adapting to the overload is large.

Description

The Deck Arch Bridges of prestressed concrete strut and tie is set between a kind of arch springing cushion cap

Technical field

The utility model relates to a kind of Deck Arch Bridges structure, relates in particular between a kind of arch springing cushion cap the novel Deck Arch Bridges structure that the prestressed concrete strut and tie is set.

Background technology

On bear the bridge type that the formula arch bridge is a kind of ancient classics, profile is elegant graceful, its loading characteristic is: under load action, arch springing produces horizontal thrust, has greatly reduced the moment of flexure of main arch ring, is adapted at the reasonable regional Construction of geological conditions.Soft clay area is built Deck Arch Bridges, and the conventional method of opposing horizontal thrust has two kinds of methods: the one, and the Foundation Design of the large scale of construction of employing, such as multi-column pier foundation or open caisson foundation+anti-skid plate, the method cost is higher, and the duration is longer; The 2nd, adopt prestressing technique equilibrium level thrust, such as arrange external prestressing tendon in bridge deck, or epoxy full coat dress non-bending steel cable finished product flexible cable or parallel steel wire rope etc. are set between two arch springing cushion caps.All in all, the research of prestressing technique in Deck Arch Bridges and apply less, and current case history and achievement in research all adopt flexible cable, its weak point mainly is: the one, and durability is poor, although flexible cable has been used the safeguard measures such as epoxy coating or double-deck PE overcoat, but still need to change in the bridge life cycle management, during replacing, for the enough construction spaces of assurance, need will banket rejecting after platform, backfill again after replacing; The 2nd, construction inconvenience, flexible cable must load along with the construction of superstructure and grading tension progressively, and, in order to ensure the stretch-draw space, must retain the construction passage until the second stage of dead load completes.

The utility model content

In view of the deficiency of above-mentioned conventional practice method, the purpose of this utility model is the above-mentioned deficiency that overcomes prior art, provides a kind of and can resist horizontal thrust and the low novel Deck Arch Bridges that also can reduce difficulty of construction of cost.For achieving the above object, the technical solution that the utility model adopts is:

The Deck Arch Bridges of prestressed concrete strut and tie is set between a kind of arch springing cushion cap, comprise main arch ring, cushion cap and pile foundation prestressed concrete strut and tie, the arch springing of main arch ring is arranged in cushion cap, the two ends of passing the prestress wire of every prestressed concrete strut and tie are anchored at respectively in the cushion cap of homonymy, and main arch ring, pile foundation and prestressed concrete strut and tie are connected to form integral body by cushion cap.

With conventional art, compare, the beneficial effects of the utility model are:

(1) the prestressed concrete strut and tie is the conventional interior bonded prestress concrete component of body, without special Anticorrosion, with the same life cycle of overall structure, need not change good endurance in practicality;

(2) in the construction, the prestressed strand in the prestressed concrete strut and tie can put in place by single tension before the complete main arch ring afterwards of bearing platform construction falls frame, need not reserve the repeatedly stretch-draw step by step of construction passage, constructed convenient;

(3) the anti-push-and-pull horizontal rigidity of arch springing is large, is with more than 3.5 times of flexible cable Deck Arch Bridges, also than nothing prestressing force, only arranges that the fixed-end arch of large scale of construction Foundation Design is large, therefore the arch springing horizontal movement is little, the ability that structure adapts to overload is large;

(4) the utility model adopts the conventional material conventional structure, and working procedure is few, therefore cost is low, the duration is short.

The accompanying drawing explanation

Fig. 1 is a kind of front view that the Deck Arch Bridges of prestressed concrete strut and tie is set of the utility model;

The left view that Fig. 2 is Fig. 1;

The A-A sectional drawing that Fig. 3 is Fig. 1.

In figure:

1---main arch ring 2---cushion cap 3---pile foundation

4---prestressed concrete strut and tie 5---prestress wire

The specific embodiment

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is further described.

The utility model is a kind of Deck Arch Bridges that the prestressed concrete strut and tie is set between the arch springing cushion cap, comprises main arch ring 1, cushion cap 2, pile foundation 3 and a plurality of prestressed concrete strut and tie 4.This structure is by the horizontal thrust of pile foundation 3 and the common opposing of prestressed concrete strut and tie 4 main arch ring 1 arch springing position, and wherein prestressed concrete strut and tie 4 is shared most of share.This structure can be designed by following flow process: (1) is calculated by the fixed-end arch without prestressed concrete strut and tie 4, tries to achieve vertical counter-force, moment of flexure and the horizontal thrust of arch springing; (2) carry out the design of pile foundation 3 according to the vertical counter-force of arch springing and the moment of flexure of trying to achieve, pay the utmost attention to single stake, adopt double-row pile while can't pass because of the single stake of Moment Influence; (3) obtain the aggregate level extensional rigidity of pile foundation 3; According to the axial rigidity of prestressed concrete strut and tie 4, should be 3.5 times and above requirement of the anti-push-and-pull rigidity of pile foundation 3 level, determine the sectional dimension of prestressed concrete strut and tie 4, can guarantee that so most of horizontal force born by prestressed concrete strut and tie 4 rather than pile foundation 3.(4) horizontal thrust of the fixed-end arch without prestressed concrete strut and tie 4 of total initial tensioning power of the interior prestress wire 5 of prestressed concrete strut and tie 4 >=1.45 times, be mainly to consider that every loss of prestress sum is probably 30% of initial tensioning power, and must guarantee in bridge state lower prestress concrete pulling depression bar 4 certain compressive stress deposit should be arranged.

Although the above is described the utility model in conjunction with figure; but the utility model is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment is only schematic; rather than restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; in the situation that do not break away from the utility model aim, can also make a lot of distortion, within these all belong to protection of the present utility model.

Claims

1. the Deck Arch Bridges of prestressed concrete strut and tie is set between an arch springing cushion cap, comprise main arch ring, cushion cap and pile foundation, the arch springing of main arch ring is arranged in cushion cap, it is characterized in that, described Deck Arch Bridges also comprises a plurality of prestressed concrete strut and ties, the two ends of passing the prestress wire of every prestressed concrete strut and tie are anchored at respectively in the cushion cap of homonymy, and main arch ring, pile foundation and prestressed concrete strut and tie are connected to form integral body by cushion cap.