SU926146A1 - Steel and reinforced concrete span structure of bridge - Google Patents

Description

(B) CROSS-FLAT

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The invention relates to bridge construction and can be used in the construction of steel-reinforced concrete superstructures, mainly road collapsible bridges of small and medium spans.

The steel concrete bridge span is known, including metal-doubled main main beams united by transverse links and a reinforced concrete slab reinforced from blocks of blocks reinforced on them, the carriageway combined with head beams fixed to the main beams reinforced on the main beams OJ.

A disadvantage of the known span structure is the considerable complexity of the installation and the impossibility of multiple use of blocks of reinforced concrete slabs due to the need to lay a large amount of solid concrete for the expansion of the bridge.

Dineni slab blocks with metal main beams.

The closest in technical essence and the achieved effect to the proposed invention is a steel-concrete superstructure of the bridge, including cross-linked metal I-beam main bridges and. reinforced concrete block from the blocks of the roadway with the location of the longitudinal seams above. main beams, fitted along the edges of facing each other blocks, butt plates and embedded elements of fastening the slab blocks to the upper along at least the main beams themselves by means of high-strength bolts, the embedded elements being made as protruding from the blocks of the anchored plates, and the gaps between the reversed the edges of the bolts to each other and between the supporting surfaces of the blocks and the upper ones of the main beams themselves are filled with grout 2.

A disadvantage of the well-known span structure is the considerable complexity of installation and the impossibility of using reinforced concrete slab 0 collapsible bridges in view of the presence of wet processes and the almost impossible reuse of slab blocks after their disassembly.

The purpose of the invention is to reduce the labor intensity of installation and to ensure the possibility of using reinforced concrete slabs in collapsible bridges by eliminating wet processes and ensuring the turnover of slab blocks.

This goal is achieved by the fact that, in connection with concrete, the span of the bridge, which includes cross-sectioned metal I-beam main beams and a reinforced concrete slab of reinforced concrete blocks on them, with longitudinal seams over the main beams, along the edges facing each other. blocks by butt plates and embedded elements of fastening blocks to upper ones by at least the main beams by means of high-strength bolts, embedded elements are made in each block slabs in the form of a rigid frame located along the perimeter of the block and made of reinforced channels, at least the lower shelves of channels and concrete blocks are made with coaxial holes for high-strength bolts, butt plates fixed on the upper adjacent shelves of channels, the frame of adjacent slab blocks, and the slab reinforcement is attached “in welding to the reinforcing ribs of the frame of each slab block located opposite each other. At the same time, the holes for high-strength bolts for fastening the slab blocks to at least the main beams can be made in the concrete blocks in the lower height of their parts, and the holes coaxial with them in the frame of each of the blocks are made only. In the lower shelves of the channels, and the nuts for high-strength bolts are fixed on the lower shelves of channels in concrete blocks. The holes for high-strength bolts for fastening the slab blocks to at least the main beams can be formed in the concrete blocks to their full height, and the holes coaxial with them in the frame of each of the blocks are made in the upper and lower shelves of channels. Slab blocks can be fitted with bottom mounted to the rigid frame of each of the blocks.

intermediate elements, made in the form of detachably attached to the upper sections of the main beams of the profile sections having at least the lower supporting shelf. Wherein

5 frames At least parts of the slab blocks can be filled with self-squeezing concrete.

FIG. L is a cross section of the span, to the right of the axis of symmetry of which a variant with a reinforced concrete slab having through holes for high-strength bolts is presented, and to the left is a variant with a reinforced concrete slab having non-through holes for high-strength bolts; figure 2 - section aa in figure 1 with concreted and nezabetonirovannye framework blocks of the plate, as well as with parts of the main beams without a plate; Figure 3 shows a horizontal section through a rigid frame of a slab block with holes only in the lower shelves of the channels; Fig. 4 shows a section BB, Fig. 3; Fig. 5 shows a variant of the span with fastening to the main beams of the slab, the blocks of which are made with blind holes for high-strength bolts; Fig. 6 shows the mentality of the rigid frame of the plit.block block for the variant with non-through holes in the slab (section B-B in Fig. 5); in fig. 7 is a variant of the span structure with fastening to the main beams of the slab, the blocks of which are made with through holes for high-strength bolts; Fig. 8 is a variant of the superstructure with an elevated location of the reinforced concrete slab and intermediate elements in the form of channels; figure 9 is the same, with intermediate elements in the form of I-beams; Fig. 10 shows a fragment of the facade of a superstructure with an elevated location of the reinforced concrete slab; 5, FIG. 11 is the facade of the temperature-continuous span; 12 shows the facade of a partially-continuous span with an elevated location of the reinforced concrete slab and an elongated intermediate element in the overhead sections; Fig. 13 shows the construction of a transverse junction of blocks of a plate with an end-to-end stop; Fig. 1 shows the same, with a gap filled with a solution and a rubroidic gasket between the ends of the slab blocks facing each other; Fig. 15 shows the structure of a hinged transverse joint of slab units located at an elevated level; Fig. 16 shows the construction of a transverse junction of the slabs of the slab, located at an elevated level, using transverse intermediate elements mounted on transverse links in the plane of the joint.

The steel concrete bridge span includes joint metal I-beam main beams 2 transverse 1 and longitudinal (not shown), and reinforced concrete slab 3 of the roadway with reinforcement 3 of the carriageway between the slab blocks above the main beams 2, reinforced on edges m facing each other blocks butt plates 5 made in the form of rigid frames 6. with the inlaying elements of fastening the blocks of the plate 3 to the upper along at least the main beams 2 by means of high -strength bolts 7 or 8.

The rigid frame 6 is made in each of the blocks of the plate 3 along the perimeter of the block of 9 reinforced reinforcement ribs 9 channels, and at least the lower shelves of the channels of the frame 6 and the concrete blocks of the plate 3 are made with coaxial holes, 10-12 for high-strength bolts, respectively 7 or 8. The butt plates 5 are fixed on the upper adjacent shelves of the channels of the frame 6 of the adjacent blocks of the slab 3 to perceive negative moments from the local load in order to reduce the percentage of slab reinforcement and also to increase the fatigue strength of the knots block attachment to the main beams. The reinforcement 13 of the reinforced concrete slab 3 pr1 is fastened by welding to the stiffening ribs 9 of the frame 6 located opposite each other of the frame 6 of each of the blocks of the plate 3 (Fig.6).

266, 6

The bridge span can be made in two versions (Figures 1 and 2). In the first embodiment, the holes 11 for high-strength bolts 7 5 of fastening the slab blocks to the main beams 2 and, possibly, to the transverse connections m 1, are made in the concrete of the blocks of the slab 3 in the lower height of their parts, and the holes coaxial to them 10 in the frame 6 of each block are made only in the lower shelves of channels, and the nuts And under the high-strength bolts 7 of normal length are installed on the lower shelves

15 channels of frame C with coaxial holes m 10 are fixed in the concrete of blocks against scrolling by means of, for example, sections of reinforcement 15 welded to the lower shelves of channels of channels (Fig. 5 and 6). The advantage of this option is the possibility of using bolts 7 of normal length, as well as in the absence of bolt heads protruding above the plate surface.

According to the second variant (Fig. 7), openings 12 for high-strength bolts 8 for securing blocks of plates 3 to the main beams 2 and, possibly, to the front links 3, are formed in concrete blocks to their full height, and coaxial to them holes 10 in the frame 6 of each of the blocks are made in the upper and lower shelves of channels. At the same time, high-strength bolts 8 are of considerable length (up to 250 mm).

The advantage of this option compared to the first one is the elimination of mortgage nuts and ensuring

The compression of concrete blocks of the slab with high-strength bolts, the disadvantage of projecting over the surface of the slab of the head of the bolts, their considerable length, as well as the need to install removable sleeves (not shown) to form through-holes 12 in the concrete blocks.

In order to provide the possibility of increasing the length of the span to be covered using the same main beams made, for example, from wide-flanged or normal rolling I-beams, as when blocking a smaller span, the blocks of the plate 3 can be equipped with intermediate blocks attached to the rigid frame 6 of each block. elements 16, made in the form of connectors connected by means of bolts 17 to the upper, along the main beams, 2 sections of the profile having at least the lower supporting shelf (fig. 8 - 10). High-strength bolts 7 or 8 or factory welding (not shown) can be used to attach the intermediate elements 16 to the blocks of the plate 3. Intermediate elements 16 can be made in the form of segments of twin channels (Fig.8) or I-SPHIG.9). The use of intermediate elements 16 provides for the estimate of the location of reinforced concrete slab 3, which is increased in this case, a significant increase in the rigidity and strength of the main beams 2, which can be unified in the required rational range of spans lengths. At the same time, the extension of the range of lengths of overlapped spans can be achieved by making the span in the form of a temperature non-cutting (Fig. 11) or partially uncut (Fig. 12) structure with its support on the intermediate supports 18 through the movable support parts 19. P | In the form of a temperature-continuous construction (Fig.P), rigid longitudinal elements (channel bars of frames 6 and reinforcements of 13 blocks of the slab ensure that the tensile forces are perceived from the relaxed negative bending moment n d support 18. At the same time, to increase the crack resistance of the slab 3 above the supports 18, self-hardening concrete can be laid from the frames of 6 blocks of the slab, the compression of which during hardening i is due to reactions occurring in a closed box 6 of the channels of the corresponding blocks of the slab. During the passage of the span in the form of a partially continuous construction (FIG. 12), the continuity is ensured by fastening the upper beams 3 of the elongated intermediate elements 20, included in the joint with the main beam, onto the upper webs of the axle-adjacent bridge. and work on from the gib. At the same time, due to the use of self-priming concrete in the slab 3, overhead sections, as well as due to the inclusion of reinforcing bar and rigid longitudinal elements of frameworks & It turns out to be possible to include in the work with the adjacent main beams also the reinforced concrete slab of the roadway. The mounting joints of the main beams in all the described possible variants (Figures 10-12) include vertical 21 and lower half 22 butt plates. The function of the upper belt joints, KOBbix lining, is performed either by reinforced concrete slab 3 (Fig. 11) or by intermediate elements 16 (Fig. 10, 12). In figure 10, 13 - 16 presents possible options for the transverse joints of the plate 23 of the carriageway. While ensuring that the compressive force is transmitted by part through the end faces of the adjacent blocks of the plate, and partly by butt plates 5, the joint structures shown in FIGS. 10, 13, 15 and 1b or supported on cross-links 1 made of a hinged type can be applied. The design of the transverse joint can also be made without butt plates 5 by arranging the gap 2 between the end faces of adjacent slabs of the slab, laying a rubber jacket 25 in it and placing the solution into it when concreting the protective driving cloth 26 with a thickness of 3 - 5 cm, and a reinforcement mesh 27 is laid in the cross-sectional area, preventing cracking of the ride-over sheet 2b when a local load is applied to the slab between cross-links (Fig. 1). When disassembling the span, the concrete filling the gaps 2k is freely removed together with the roofing jacket 25. The blocks of the roadway slab can be concreted both before and after fixing the frameworks of the blocks on the main beams 2. In both cases the difference is in the hole diameter frame elements and upper main beams on the order of k - 6 mm, which greatly facilitates the installation of high-strength bolts securing the slab blocks to the main beams. The proposed span structure makes it possible to use it in prefabricated bridge structures, provides a significant reduction in the labor intensity of installation and an increase in the rate of assembly.

Claims (3)

1. An aggregate bridge span, including cross-linked metal I-beam main alkyes and a reinforced concrete block of the roadway reinforced from a block with the location of longitudinal seams above the main beams, fitted on the edges of facing blocks with butt plates and mortgages elements of fastening the slab blocks to the upper ones by themselves at least the main beams by means of high-strength bolts, characterized in that, in order to reduce the laboriousness of installation and ensure POSSIBILITY use of reinforced concrete slabs prefabricated bridges by avoiding | Efficient processes and provision of 4HBaeMoctH slab blocks, embedded elements are made in each of the slab blocks in the form of a rigid frame located around the perimeter of the block and made of subgroups inside the stiffeners of channels, and at least in the lower shelves of channels and concrete blocks are made coaxial holes for high-strength bolts, butt plates are fixed on the upper adjacent shelves of channels of the frame of adjacent blocks of the plate, the reinforcement of the plate is attached to the welding to the ribs opposite to each other the strength of the frame of each block plate. 2. The bridge span of claim 1, characterized in that the holes for the high-strength bolts for fastening the slab blocks at least to the main beams are made in the concrete blocks in the lower height of their parts, and coaxial holes in the frame of each block are made in the lower shelves of channels, and nuts for high-strength bolts are fixed on the lower shelves of channels in concrete blocks. 3. The superstructure of a bridge according to claim 1, wherein that the holes for high-strength bolts for fastening the slab blocks, at least to the main beams, are formed in the concrete of the blocks to their full height and coaxial to them holes in the frame each This unit is made in the upper and lower shelves of channels. k. The bridge span of claim 1-3, characterized in that, in order to ensure the possibility of increasing the length of the span, the slab blocks are equipped with intermediate elements attached to the rigid kajjKacy of each block, made in the form of detachably attached to the upper ones by themselves. the main beams of the sections of the metal profile having at least the lower support shelf. , 5 The span of the bridge in accordance with paragraph 1 - A, of which there are so that, in order to reduce the consumption of reinforcement for the reinforced concrete slab, the frameworks of at least part of the blocks The plates are filled with self-pressurized schims concrete. Sources of information taken into account in the examination 1. Gribshman E.E. Design of metal bridges. M., 19b9, with. 109-110, fig. 7 2. The study of steel and steel concrete superstructures bridges. Works ZNIIS, vol. 7b, 1970, p. 222-227, fig. AND. Fg / g / fT I II II Jl} 1 1mv If ffIt I II j II j; f1 / g. Fg / g f J5 // // , Лл.ЛГП7 / J Fg / g.ff fug. 7 Hf “R. t h o V h Ji fc fe EEC GB Phi. l / 26 J 7 webg 4444 ( FUG. / gv 5 3 M. / U / KUT UCHU: IS, fff. f  ge 8 d b S