SU992645A1 - Structure of joint of temperature-unsplit bridge span constructions in over supports portions - Google Patents

Description

The invention relates to bridge construction and can be used in the construction of temperature-continuous spans of bridges.

A known design of the interface of temperature-undereferenced bridge span structures in abutting sections, including precast beams with ribs ... and slabs of the carriageway, transverse reinforcing slab outlets, and also monolithic longitudinal joints between slabs of adjacent beams [13.

The disadvantage of this design of the interface is the low strength of the ultimate joints due to the limited length of the interface, which leads to the formation of monolithing in the concrete, longitudinal joints of transverse cracks of large opening and crack formation and destruction of the coating on the interface.

The closest to the proposed technical essence and the achieved effect is the design of the interface of temperature-continuous spans of the bridge in the supporting sections, including precast beams, each of which is made in the form of a rib and a roadway plate formed with it in one piece with non-concrete sections having transverse and longitudinal reinforcing outlets, as well as monolithic transverse and longitudinal seams between the plates of adjacent beams. The plate above the end sections of the ribs of the beams is removed [2].

The disadvantages of the known design of the interface are reduced bearing capacity and strength of the monolithic transverse seam between the plates of adjacent beams due to a sharp change in the cross-section of the ribs and the costal part of the plates of the carriageway in the interface.

The purpose of the invention is to increase the bearing capacity of the interface design in the plane of the transverse seam between the plates of adjacent beams.

This goal is achieved by the fact that in the design of the interface of temperature-continuous continuous spans of the bridge in the supporting sections, including precast beams, each of which is made in the form of a rib and a roadway plate formed with it in one piece with unfinished end sections having transverse and longitudinal reinforcing outlets, as well as monolithic transverse and longitudinal seams between the plates of adjacent beams, the end sections of the plates of each beam are made with nadrebny zones, and the interface design is equipped with and longitudinal vertical 5 gaskets adjacent to the lateral ‘faces of the supracostral zones of the plates of each beam.

Figure 1 shows the interface design outside the longitudinal seam, a longitudinal section through 10; figure 2 is the same, a view in plan; in Fig.Z - section aa in Fig.2; figure 4 - end section of the beam, axonometric projection. fifteen

The interface design includes prefabricated beams 1 with ribs 2 and plates 3 of the carriageway made integrally with them, having transverse 4 and longitudinal 5 reinforcing outlets. The plates 3 are made with non-concreted end sections 6 and are united by monolithic longitudinal 7 and transverse 8 seams in the supporting sections. When concreting 25, additional reinforcing rods 9 were used. The monolithic concrete of the transverse seam 8 is separated from the side faces 10 of the supracostral zones 11 of the slabs adjacent to the last vertical __ longitudinal spacers 12.

The proposed design of the interface works as follows.

Due to the presence of nadrebny zones 11, the cross-section plates and reinforcement of the ribs 2 remain unchanged, which enhances the cross-section of the beams in the supporting sections at their mating ends and, at angular deviations of the ends of the beams, ensures reliable operation and durability of the interface and coating (not 40. shown). The separation of the lateral faces 10 of the supracostric zones 11 of the plates 3 with gaskets 12 ensures the independence of the operation of the costal zones 11 from the concrete monopolizing the transverse seam 8, 45 which has less rigidity than the costal region of the plate and is more deformative in comparison with it.

Thus, the gaskets 12 prevent the destruction of the concrete of monolithicity of the transverse seam at angular deformations of the ends also due to the increased width of the transverse seam, which increases crack resistance.

The elastic conjugation of the concrete by monolinging the transverse seam and the rib areas of the plates 3 by means of gaskets 12 ensures smoothing of the angular deformations of the beams and thereby eliminates the possibility of damage to the waterproofing and clothing of the roadway (not shown).

The use of the proposed design of the interface will increase the bearing capacity of the transverse seam by ensuring the deformability of the operation of the interface due to the exclusion of changes in the ribs and costal zones of the plates.

Claims (2)

as well as monolithic transverse and longitudinal seams between the plates of adjacent beams, the end sections of the plates of each beam are made with upper ribs, and the mating structure is provided with longitudinal vertical gaskets adjacent to the lateral faces of the secondary ribs of the plates of each beam. Fig. 1 shows the mating structure outside the longitudinal seam, a longitudinal section, in Fig. 2, the same, plan view; on fig.Z - section aa in figure 2; 4 is a condo section of a beam, an axonometric projection. The structure of the mating includes prefabricated beams 1 with ribs 2 and plates 3 of the roadway, which are made in one piece with them, having transverse 4 and longitudinal reinforcement 5. The plates 3 are made with non-concrete end sections b and are joined by homogenized longitudinal 7 and transverse 8 seams in the supra-supporting sections. During concreting, additional reinforcing rods 9 were used. The concrete for monolithing transverse ridge 8 is separated from the side faces 10 of the suturing zones 11 of the slabs adjacent to the last vertical longitudinal spacers 12. The proposed coupling structure works as follows. Due to the presence of nadreberny zones 11 sectional plates and the reinforcement of the rib 2 remain unchanged, which reinforces the cross section of the beams in the supra-support sections in their adjacent ends, and when angularly defining the ends of the beams, both bake the reliability of operation and durability of the mating and cover (not shown ) The separation of the lateral faces 10 of the sub-ribs 11 of the plates 3 with pads 12 ensures the independence of the operation of the sub-ribs of the 11 from the concrete of the joint joint of the transverse seam 8, which is less rigid than the sub-rib of the plate and compared to it more deformative. Thus, the gaskets 12 prevent the concrete from breaking down the joint seam at the corner deformations also due to the increased width of the transverse seam, which increases the crack resistance, Elastic coupling of the concrete to the monolith of the transverse seam and the scraper zones of the plates 3 by means of the gaskets 12 ensures smoothing of the corner deformations of the beams and thereby eliminates the possibility of damage to the waterproofing and clothing of the roadway (not shown). The use of the proposed mating design will provide an increase in the bearing capacity of the transverse seam by ensuring the deformability of the mating operation due to the exclusion of changes in the edges and sub-rib zones of the plates. The invention of the interface design of the temperature-continuous span structures of the bridge in the supra-support sections, including prefabricated beams, each of which is made in the form of a rib and a roadway plate formed in one piece with it, with unfinished end sections, having transverse and longitudinal reinforcement and also monolithic transverse and longitudinal seams between the plates of adjacent beams, characterized in that, in order to increase the bearing capacity of the mating structure in the plane of the transverse seam between They are adjacent to the beams, the end sections of the slabs of each beam are made with nodal zones, and the mating design is provided with longitudinal vertical gaskets adjacent to the lateral faces of the hypochial zones of the slabs of each beam. Sources of information taken into account in the examination 1.Methodical recommendations for the design and construction of temperature-continuous span bridges on highways. M., Publishing House of Union, 1977, p. 1415, Fig.3. 2. Methodical recommendations on design and. the construction of temperature-continuous span bridges on highways. M., Publishing House of Union, 1977, p. 1213, fig. 2 a, 5 (prototype). J / / /. lyf i nrtKf f "t.J "Fwz.V