The connecting device of precast reinforced concrete slab on steel girder composite bridge

 

(57) Abstract:

The invention relates to the field of bridge engineering and can be used in steel and concrete spans of bridges to join the team reinforced concrete slab of the carriageway with the steel. The connecting device of precast reinforced concrete slab on steel girder composite bridge includes embedded elements in reinforced concrete slab of the carriageway, in which there are holes aligned with the holes in the main beam for connecting the plate with the beam. New according to the invention is that the anchoring device on the main beam in the form of metal beams, which has a horizontal bore in which is placed a cylindrical nut and inclined hole for the stud. The technical result of the invention is to improve reliability, maintainability, reduce material consumption and labor. 1 C.p. f-crystals, 2 Il.

The invention relates to the field of bridge engineering and can be used in steel and concrete spans of bridges to join the team reinforced concrete slab of the carriageway with the steel.

A device d is e details of reinforced concrete slabs in the form of a steel sleeve from the bottom to the top zone of the steel beams (EN 2133792, E 01 D 12/00).

It is also known connecting device composite superstructure of the bridge, including metal edge mounted on concrete slab, the lower ends of which are welded to the upper zone of the main beam span bridge (ed. St. SU 692927, E 01 D 12/00, 1979).

Known designs for combining precast reinforced concrete slab with a metal beam of the superstructure of the bridge have a number of disadvantages, the main of which is neremontolrigoden.

Closest to the proposed invention is a coupling device of composite steel and concrete bridge, including embedded items in concrete slab of the carriageway, in which there are holes aligned with the holes in the main beam of the superstructure of the bridge under high-strength bolts that connect the plate with the beam, and the elements of the mortgage is made in the form of a frame located around the perimeter of the plate and consisting of a reinforced from the inside with ribs and channels (ed. St. SU 926146, E 01 D 1/00, 1982).

The disadvantage of this coupling devices is quite high intensity, seremoniamestari, maintainability, reduce material consumption and labor.

This problem is solved due to the fact that the coupling device of precast reinforced concrete slab on steel girder composite bridge, including embedded elements in reinforced concrete slab of the carriageway, in which there are holes aligned with the holes in the main beam for connecting the plate with the beam, the anchor device on the main beam in the form of metal beams, which has a horizontal bore in which is placed a cylindrical nut, and an inclined hole for the stud.

The slope of the coaxial holes in the concrete slab and steel beam may vary depending on the direction of the forces occurring in the connecting device, and regulated voltage.

The invention is illustrated by drawings, where:

in Fig. 1 shows a connecting device in the incision across the span;

in Fig.2 - the same, along the span.

The device includes inset element (area with hole) 1, to which is welded anchor fittings 2 concrete slabs 3. The metal beam, consisting of walls 4 and the top po 7. Through the slanted holes in the fixed element 1, reinforced concrete slab 3 and the beam 6 is screwed into the cylindrical nut 7 pin 8 with a nut 9 and washer 10.

When installing the Board, the pin 8 is inserted into the hole laying element 1 (area), the hole in the concrete slab 3, the inclined hole in a metal beam 6 and is screwed into the nut 7 to the end. Then on the other end of the stud 8 is put on the washer 10 and is screwed in the nut 9 to the estimated effort. After that, the cell with the nut is filled with sealant.

Depending on the direction of the forces occurring in the connecting device, the slope of the coaxial holes in the concrete slab and steel beam may vary, and in the connecting device will regulate the voltage.

1. The connecting device of precast reinforced concrete slab on steel girder composite bridge, including embedded elements in reinforced concrete slab of the carriageway, in which there are holes aligned with the holes in the main beam for connecting the plate with the beam, characterized in that the anchoring device on the main beam in the form of metal beams, which has a horizontal bore in which is placed , the slope of the coaxial holes in the concrete slab and steel beam may vary depending on the direction of efforts, occur in the connecting device, and regulated voltage.

 

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SUBSTANCE: span structure includes reinforced concrete panel connected to steel beam by rests embedded in panel body and welded to steel sheet secured to beam. Steel sheet is connected to steel beam belt by high-strength bolts inserted in belt orifices. Orifices have circular shapes in over-pier zone, remainder orifice parts are oval and located so that major oval axis extends along longitudinal span structure axis. Lengths of oval orifices are variable and depend on degree of elastic deformation due to applying squeezing force to reinforced concrete. The greatest length is in preloaded reinforcement anchoring area and length is reduced towards over-pier zone. Ratio between maximal length a of oval orifice to length b of orifice located in over-pier zone and having minimal length a/b = 1.0 - 4.0. High-strength bolts inserted in oval orifices are closed with protective caps to protect bolts against concrete action. Cap contour mates to oval orifice outline. Method of span structure production involves concreting reinforced concrete panel and applying tensioning force to high-strength reinforcement on steel sheet having rests welded thereto and connected to steel beam, wherein steel sheet is connected to steel beam by high-strength bolts inserted in oval orifices and bolts are slackened before reinforcement tensioning. After that reinforced concrete panel resiliently reduces in length on beam belt under the influence of squeezing force and bolts slide along longitudinal orifice. Then protective caps are taken off and blots are tightened with desired force.

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EFFECT: increased safety against failure and durability of panel connection with steel bridge beam belt, which are equivalent to that of cast-in place panels.

2 cl, 2 dwg

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