CN202194082U

CN202194082U - Road hinged hollow bridge plate with reinforced transverse external prestress

Info

Publication number: CN202194082U
Application number: CN201120282485XU
Authority: CN
Inventors: 王海良; 任权昌; 杨新磊; 董鹏
Original assignee: Tianjin Urban Construction College
Current assignee: Tianjin Urban Construction College
Priority date: 2011-08-05
Filing date: 2011-08-05
Publication date: 2012-04-18
Anticipated expiration: 2021-08-05

Abstract

The utility model relates to a road hinged hollow bridge plate with reinforced transverse external prestress, which belongs to the bridge construction technical field. The hollow bridge plate is characterized in that bar planting is performed on the wet-joint parts on the top and the beam end part of each hollow plate span center web through 12 steels bars; the external end of each planted bar is inverted L-shaped; five transverse prestressed steel strands are equipped on the lower part of each bridge span center top plate; a bunch of 7 phi 5 unbonded prestressed steel wires is adopted in each steel strand; and the transverse prestressed steel strands penetrate and fix the hollow bridge plates which are arranged side by side. By equipping connecting steel bars on the end face of an articulated slab with an original bridge floor dismounted, the connection between a bridge deck and the hollow plate is enhanced and the load is transversely distributed in a more uniform way. By equipping the transverse external prestressed steel bars among the parts near the span center of each hinged hollow plate span through current construction tools, the transverse connection between plates is reinforced. By adopting a comprehensive control method, the disease existing in the hinged hollow bridge plate and characterized by force on a single plate can be fundamentally solved.

Description

The hinged horizontal external prestressing strengthening voided slab of highway

Technical field

The utility model belongs to the bridge construction technical field.

Background technology

At present; Road bridge is owing to receive cause influences such as design, construction, use; The bridge floor that continuous hinged hollow slab bridge technology behind the first freely-supported of a lot of employings is arranged; Exist bridge floor the crack to occur, plate span centre basal crack transfinites, and so-called " veneer is stressed " phenomenon occurs, the reason that this disease takes place is mainly in the following aspects:

1, deck paving thickness is less, is generally 8cm, and the direction across bridge reinforcing bar is encrypted in the bridge deck pavement near each bridge pier fulcrum; Encrypt spacing and be generally 5cm, other location gap is generally 15cm, and the bearing that the fulcrum place is provided with has retrained the lateral deformation of hollowcore slab to a certain extent; Therefore near each hollowcore slab stressed more even fulcrum; And near the span centre each hollowcore slab since the bridge deck pavement reinforcing bar that spacing is set is bigger, not enough to each plate horizontal restrain, make each plate unbalance stress;

2, the transmission of vertical shear realizes by hinged structures between the hinged hollowcore slab of assembling; Transmission through this shearing realizes the lateral transport and the distribution of traffic load, and when bond strength between plate was not enough to resist the vertical shear that traffic load produces, the joint sealing material concrete can ftracture under the driving load action between plate; The torsional interaction that each plate produces owing to the side vertical shear; Aggravate crack on concrete between plate, under the driving load action, so-called " veneer is stressed " phenomenon occurred; This cross direction profiles with the design hollowcore slab is not inconsistent certainly; The appearance of " veneer is stressed " phenomenon makes some plate stressed excessive, ftractures so that exceed the permission field of load of plate;

The existence of disease has a strong impact on durability of structures, and traffic safety is also constituted harm, rebuilds like complete removal; Not only influence traffic operation; Invest also greatlyyer, for making full use of existing bridge construction, it is very necessary that the hinged hollow slab bridge of disease is carried out horizontal external prestressing strengthening.

Summary of the invention

The purpose of the utility model is: provide a kind of highway hinged horizontal external prestressing strengthening voided slab, it can reinforce voided slab effectively, solves the stressed problem of voided slab veneer.

The technical scheme of the utility model is: at each hollowcore slab span centre web top, the wet seam areas of beam end carries out bar planting with

12 reinforcing bars; The bar planting outer end is for falling " L " type; 5 transverse prestress steel bundles are set below the top board in every width of cloth spanning; Every a branch of 7 Φ of steel Shu Caiyong 5 un-bonded prestressed steel strands, transverse prestress steel bundle runs through the voided slab that fixedly is arranged side by side.

The beneficial effect of the utility model is: on the articulated slab end face after removing original bridge floor connecting reinforcement is set, has increased being connected of bridge deck and hollowcore slab, make the load cross direction profiles more even;

Utilize existing construction tool, prestressed reinforcement outside the weft element is set between near each hinged hollowcore slab span centre, strengthened each plate and laterally connected.

Take measure of comprehensive, can solve hinged hollow slab bridge " veneer is stressed " disease at all.

Description of drawings

Fig. 1 is that the utility model is reinforced flow chart;

Fig. 2 be the utility model monolithic beam 1/2 stride newly water bridge floor bar planting layout plan;

Fig. 3 is the utility model span centre bar planting facade arrangement diagram;

Fig. 4 is the utility model bridge pier end bar planting facade arrangement diagram;

Fig. 5 is that the utility model transverse prestress steel bundle is arranged elevation;

Fig. 6 is the vertical arrangement diagram of the utility model single span transverse prestress steel bundle.

The specific embodiment

Below in conjunction with accompanying drawing the utility model is done and to be further described:

As shown in the figure, the 1st, voided slab, the 2nd, bar planting, the 3rd, transverse prestress steel bundle.

Whether successful how to strengthen with striding transverse integral stress performance between each hollowcore slab is to reinforce key; The present invention starts with from increasing with the method for striding transverse splicing between each hollowcore slab; Through increase the deck paving layer thickness, strengthen the bridge deck pavement reinforcing bar, strengthen bridge deck pavement and each plate connection, to hinge seam concrete handle make more closely connected between each plate, apply weft element outside measure realization such as each plate transverse splicing of prestressed reinforcement reinforcement through near top, cross section span centre; Strengthening between each plate in the transverse splicing; Carbon fiber reinforcement, reinforcement are carried out in existing crack; To seal existing crack, improve the supporting capacity of span centre stress area, prevent the stress corrosion of prestressed reinforcement.

This type bridge reinforcement means should be main with transversely strengthening mainly, and considers the sealing in existing crack and the reinforcement of tensile zone.

Reinforce flow process and see Fig. 1.

1, deck paving is handled

Original deck paving Thickness Design is generally 8cm, might can not reach by this thickness during construction;

For increasing deck paving rigidity, improve the effect that the hollowcore slab lateral force is transmitted, make each plate stressed more even, remove original deck paving, under the situation of breaking off a friendship, pour into a mould the deck paving concrete again;

The deck paving layer thickness is increased to 12cm, and improves concrete grade to the C40 waterproof concrete, and the bridge floor reinforcing bar changes Φ 10 into, and spacing changes 12 * 12cm into;

Bituminous concrete thickness is kept the concrete standard of former 7cm water proofing asphalt;

2, the hinge seam is handled

After cleaning out original deck paving, clear up original hinge seam concrete, will cut with scissors seam with clear water and rinse well, perfusion C50 microdilatancy mortar, mortar requires that suitable degree of mobilization is arranged, early strong characteristics, and its expansion characteristics should be tested before construction;

3, connect steel plate between the seam

After waiting to remove original deck paving, check immediately between former seam to connect steel plate whether sealing-off, distortion, as have above situation, should weld or change steel plate and firm welding again;

4, hollowcore slab top bar planting

For strengthening the connection effect between hollowcore slab and deck paving; At each hollowcore slab span centre web top, the wet seam areas of beam end carries out bar planting with

12 reinforcing bars; The one of which end makes down " L " type, to strengthen the connection effect of bridge deck and hollowcore slab;

In the bar planting process, should avoid original hogging moment steel bundle in the beam, can damage anything but; Bar planting is arranged and is illustrated to see Fig. 2,3,4.

5, transverse prestress applies

5 transverse prestress steel bundles are set below the top board in every width of cloth spanning, every a branch of 7 Φ of steel Shu Caiyong 5 un-bonded prestressed steel strands, every steel bundle tension stress is 65% of a proof stress, steel bundle ground tackle adopts interchangeable, so that maintenance from now on;

After treating that steel Shu Zhangla finishes, the seal cap in steel bundle end, interior notes butter is anticorrosion; Transverse prestress is arranged and is illustrated to see Fig. 5,6.

6, the vertical span centre of hollowcore slab is vertically strengthened

After removing deck paving, carbon fiber reinforcement is pasted in the plate span centre bottom flange that the crack occurs, the one, strengthen its supporting capacity, the 2nd, primary fracture is sealed, in case steel strand stress corrosion.

Claims

1. hinged horizontal external prestressing strengthening voided slab of highway; Comprise voided slab; It is characterized in that: at each hollowcore slab span centre web top, the wet seam areas of beam end carries out bar planting with

12 reinforcing bars; The bar planting outer end is an inverted L shape; 5 transverse prestress steel bundles are set below the top board in every width of cloth spanning; Every a branch of 7 Φ of steel Shu Caiyong 5 un-bonded prestressed steel strands, transverse prestress steel bundle runs through the voided slab that fixedly is arranged side by side.