CN2753787Y

CN2753787Y - Low prestress degree three-steel concrete continuous beam

Info

Publication number: CN2753787Y
Application number: CN 200420105403
Authority: CN
Inventors: 蒙云
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-12-02
Filing date: 2004-12-02
Publication date: 2006-01-25
Anticipated expiration: 2014-12-02

Abstract

The utility model relates to a three-steel concrete continuous beam with low prestressing, which comprises a bar mat and a steel-fiber concrete bridge surface, wherein a strut beam is composed of box beams and butt plates, and the box beams are arranged at intervals and are connected into the integration through the lapping of the butt plates. The continuous beam is formed by connecting longitudinally single and parallel strong-steel wire prestressing, the bar mat is laid on the upper side and the continuous bridge surface of steel-fiber concrete is poured, and the continuous beam is formed. Compared with the present prestressing T beam which is used universally, the prestressing of the utility model is 50 to 60 percent lower than that of the present prestressing T beam, is also 20 to 40 percent lower than that of some prestressing beams, and has long service life which is prolonged by above 50 percent compared with the same kind of bridges. The three-steel concrete continuous beam also solves the problem of the continuous expansion joint for middle and small span-beam bridges, and has the advantages of running smoothly and reducing the engineering repair load caused by the damage of the expansion joint position of the present bridge surface. The utility model provides an economic bridge type with good technical performance for the continuous bridge beam of which the span is less than 50 meters.

Description

Lower-prestressed degree three steel concrete continuous beams

Technical field

The utility model relates to a kind of bridge of new structure, is specifically related to a kind of lower-prestressed degree three steel concrete continuous beams, belongs to technical field of bridge engineering.

Background technology

Traditional continuous girder bridge generally only is used to stride the above long-span bridge beam of footpath 50m because construction technology is complicated, and cost is higher than simply supported girder bridge, and the construction period is long.It all is to adopt simple beam structure with interior bridge that existing highway is striden footpath 50m, and as shown in Figure 1, the simply supported girder bridge structure is made up of several continuous cast-in-situ box girders 1, steel mesh reinforcement 2, concrete bridge deck 3 usually, and the shrinkage joint 4 between the cast-in-situ box girder 1 adopts pitch to connect.The simply supported beam of this structure adopts ordinary reinforced concrete or prestressed reinforced concrete construction usually, exists material usages such as steel many, and depth of section is big, the defective that cost is high; And deck expansion joint is more, influences the speed of a motor vehicle unavoidably, also exists driving steadily and problem such as comfortableness is relatively poor.Traffic design department all is that approach by the bridge floor connecting technique is to reduce the shrinkage joint for a long time, but facts have proved in a large number, effect is also not really desirable, after a large amount of simply supported girder bridges use certain time limit, the damaged of position, shrinkage joint often takes place, and the maintenance engineering quantity is big, blocks the traffic, become the difficult problem that traffic department deeply worries about, restricted the development of transport development to a certain extent.Along with high-grade highway, Freeway Development and application are increasingly extensive, the beam bridge of striding below the 20m of footpath except that land-service road vapour-20, extension-100 class of loading partly adopts the plate girder of reinforced concrete, adopts full prestressing T beam or plate-girder usually.And full prestressing T beam or plate-girder also are to adopt ordinary concrete to build, though concrete has crushing resistance preferably, tensile property is relatively poor, still have the problem of lacking in cost height, application life.

Summary of the invention

Problem to be solved in the utility model is to have above-mentioned technological deficiency at simply supported beams such as full prestressing T beam and plate-girders, and a kind of lower-prestressed degree is provided, the prestress steel material use quantity is few, cost is low, the new type of continuous beam of long service life.

The purpose of this utility model is achieved in that lower-prestressed degree three steel concrete continuous beams, comprises case beam, steel fiber reinforced concrete bridge floor, and girder is made up of case beam, attachment strap; The case distance between girders is arranged by the attachment strap overlap joint and is fused; Case beam and attachment strap are made by reinforcing bar, gauze wire cloth, steel fiber reinforced concrete composite material; Vertically connect, lay steel mesh reinforcement above and build steel fibrous concrete continuous deck formation continuous beam with single Shu Pinghang high tensile steel wire prestressing force.

The utility model adopts high-performance composite materials---reinforcing bar, gauze wire cloth, the prefabricated or cast-in-place monolithic case beam of steel fiber reinforced concrete (being called for short three steel concretes) and attachment strap, because three steel concretes have higher tension, anti-compression property, the continuous beam volume is reduced greatly, saved material; Simultaneously because the stressed work of tensile region material participation structure, effectively solve middle or small problem of striding beam bridge continuous and adjustable seam, has driving steadily, minimizing because of the maintenance works amount of deck expansion joint position breakage, provided a kind of technical performance good economic bridge type for building the continuous girder bridge of striding below the 50m of footpath in the past.Especially adopt three steel work degree of prestressing lower by 50～60% than the prestressed T beam of present widespread usage, also lack 20 ~ 40% than the partial prestressing beam, long service life prolongs more than 50% than similar bridge.

In sum, the utlity model has following advantage:

(1) full-bridge is continuous, and it is comfortable, steady to drive a vehicle, and does not influence the speed of a motor vehicle, and the maintenance engineering quantity is few.

(2) structural performance, excellent in durability, prolong 50% or more than similar bridge application life.

(3) combination construction, convenient and swift, the reduction of erection time, difficulty of construction is little.

(4) construction costs reduces more than 10～15% than traditional prestressed T beam.

Description of drawings

The utility model is described in further detail below in conjunction with the drawings and specific embodiments.

Fig. 1 is traditional simply supported girder bridge and the continuous organigram of bridge floor;

Fig. 2 is the utility model three steel concrete continuous beam organigrams.

Fig. 3 is the structural representation of monolithic case beam.

Fig. 4 is the structural representation of attachment strap.

Preferred forms

As shown in Figure 2, lower-prestressed degree three steel concrete continuous beams, the high performance concrete that adopts reinforcing bar, gauze wire cloth and steel fiber reinforced concrete to be composited is built light-duty, high-strength thin-walled monolithic case beam 5 and is vertically set up traversing the getting final product of traction by the bridge formation machine, adopt three steel concrete attachment straps, 6 overlap joints, lay steel mesh reinforcement 7, steel fiber reinforced concrete bridge floor is mated formation and laterally is connected to integral body, by the logical bundle of longitudinal prestressing 8 the case beam vertically is connected to continuous beam again.Case beam 5 is laid three steel concrete attachment straps 6 between laterally, and vertically the parallel high-strength prestressed steel wire 8 with single Shu Qigen Φ 7 is connected to become continuous beam, lays steel mesh reinforcement above and builds the steel fibrous concrete continuous deck, the formation continuous beam.

The utility model degree of prestressing (high tensile steel wire consumption) lacks about 40%～60% than traditional prestressing force simply supported beam, sets up conveniently, and structural performance is good.Referring to Fig. 3, the utility model case beam 5 adopts high-performance composite materials---reinforcing bar, gauze wire cloth, prefabricated or cast-in-place the making of steel fiber reinforced concrete (being called for short three steel concretes); Case beam 5 is the convex shape structure; Both sides, case beam 5 top are provided with the boss that is used to place attachment strap, and the middle part is a hollow-core construction.Fig. 4 is the structural representation of attachment strap, adopts i.e. prefabricated or cast-in-place the making of three steel concretes of reinforcing bar, gauze wire cloth, steel fiber reinforced concrete equally.

The utility model is that a kind of high-strength, light-duty, easy construction, degree of prestressing are lower by 50～60% than common prestressing force freely-supported T beam, lower by 20～40% than partial prestressing beam, the new type of continuous beam of long service life 50%.It is continuous to be intended to solve the middle or small beam bridge of striding, reduce the shrinkage joint, driving reduces in the past the maintenance works amount because of the breakage of deck expansion joint position steadily fast, reduce the bridge cost, provide a kind of technical performance good economic structure for building the continuous girder bridge of striding below the 50m of footpath.

Claims

1. lower-prestressed degree three steel concrete continuous beams, comprise lower-prestressed three steel concrete case beams (5), steel fiber reinforced concrete bridge floor (9), it is characterized in that forming strutbeam by case beam (5), attachment strap (6), case beam (5) is spaced by attachment strap (6) overlap joint and fuses; Case beam (5) and attachment strap (6) are made by reinforcing bar, gauze wire cloth, steel fiber reinforced concrete composite material; Vertically connect, lay steel mesh reinforcement above and build steel fibrous concrete continuous deck formation continuous beam with single Shu Pinghang high tensile steel wire (8) prestressing force.

2. lower-prestressed degree three steel concrete continuous beams according to claim 1 is characterized in that described case beam (6) is the convex shape structure; Case beam (6) both sides, top are provided with the boss (10) that is used to place attachment strap, and the middle part is a hollow-core construction.