CN111254799A

CN111254799A - Assembled composite structure bridge and construction method

Info

Publication number: CN111254799A
Application number: CN202010200909.7A
Authority: CN
Inventors: 向建军; 李瑜; 贺耀北; 李文武; 崔剑峰; 杨云逸
Original assignee: Hunan Provincial Communications Planning Survey and Design Institute Co Ltd
Current assignee: Hunan Provincial Communications Planning Survey and Design Institute Co Ltd
Priority date: 2020-03-20
Filing date: 2020-03-20
Publication date: 2020-06-09

Abstract

The invention discloses an assembled composite structure bridge, which comprises at least two steel girders and at least two prefabricated bridge decks, wherein each prefabricated bridge deck comprises two frame steel plates vertical to the steel girders and a concrete main body positioned between the two frame steel plates, and two connecting plates, set firmly two at least lower steel sheets of being parallel with the steel girder between two frame steel sheets, concrete body lays down on the steel sheet of connecting, and lower steel sheet upside and frame steel sheet inboard all set firmly the shear force spare that is used for connecting the concrete body, and the outside of two frame steel sheets is located to two connecting plates branches, has set firmly the polylith arm-tie between the frame steel sheet of connecting plate and homonymy, adjacent two through high strength bolt fixed connection, each lower steel sheet downside sets firmly high strength bolt and passes through high strength bolt and each steel girder one-to-one fixed connection between the connecting plate of prefabricated decking. The invention has the advantages of high industrialization degree, light dead weight, quick erection and installation, disassembly and maintenance and the like.

Description

Assembled composite structure bridge and construction method

Technical Field

The invention relates to the technical field of bridge engineering, in particular to an assembled composite structure bridge and a construction method.

Background

The medium-small span bridge is a bridge with a single-hole span of 5-40 m and occupies a large proportion in the bridge construction of expressways, national and provincial main roads and municipal engineering.

The traditional medium and small span bridge is generally a concrete beam bridge, and although the design and construction technology is mature and the construction cost is low, the traditional medium and small span bridge also has the defects of long construction period, great self-weight and the like; the steel beam bridge can greatly shorten the construction period and reduce the dead weight, but the construction cost is higher, and the steel beam bridge is difficult to be widely applied. The steel for the main beam and the concrete for the bridge deck plate in the composite beam structure are tensioned and compressed, so that the characteristics of the two materials are fully exerted, and the advantages of the two bridges are combined. In recent years, the steel girder and concrete bridge deck plate combined beam structure is greatly developed in small and medium span bridges. However, when the conventional steel plate combined bridge is constructed, the following disadvantages are mainly caused: 1. the steel main beam has a large number of on-site welding processes, the construction is complicated, and the welding quality control difficulty is high; although the hot rolled section steel has good performance and low unit price, the hot rolled section steel is limited by the production process, the beam height and the size, and generally cannot be used as a main bearing component of a bridge structure; 2. the bridge deck is made of concrete materials, in order to meet the stress requirement, the plate thickness of more than 25cm is generally adopted, the self weight is large, the beam height is high (the height-span ratio is generally 1/18-1/25), and the consumption of steel and bridge lower structure materials is large; 3. the upper concrete structure has a large number of cast-in-place wet joints, the field workload is large, the quality is not easy to control, the concrete structure is a weak point of the structure, the construction period is long for meeting the requirement of the age of concrete, and the rapid construction of the bridge is greatly limited; 4. the connecting part of the concrete bridge deck is not detachable, and the maintenance and the secondary utilization cannot be carried out.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide an assembled composite structure bridge which has high industrialization degree and light dead weight, can be quickly erected and installed, and can be disassembled for maintenance.

The invention further provides a construction method of the fabricated composite structure bridge.

In order to solve the technical problems, the invention adopts the following technical scheme:

an assembled composite structure bridge comprises at least two steel main beams and at least two prefabricated bridge decks, the prefabricated bridge deck comprises two frame steel plates vertical to the steel girder, a concrete main body positioned between the two frame steel plates and two connecting plates, wherein at least two lower connecting steel plates parallel to the steel girder are fixedly arranged between the two frame steel plates, concrete body lays in down on the connection steel sheet, down the connection steel sheet upside with frame steel sheet inboard all sets firmly and is used for connecting the shear force piece of concrete body, two the connecting plate branch is located two the outside of frame steel sheet has set firmly the polylith arm-tie between the frame steel sheet of connecting plate and homonymy, adjacent two through high strength bolt fixed connection, each between the connecting plate of prefabricated decking the connection steel sheet downside sets firmly high strength bolt and through high strength bolt and each steel girder one-to-one fixed connection down.

As a further improvement of the above technical solution: the prefabricated bridge deck further comprises a top plate, the top plate is fixedly arranged on the frame steel plate, the connecting plate and the pull plate, and the upper surface of the top plate is flush with the upper surface of the concrete main body.

As a further improvement of the above technical solution: the shear piece is welded with the frame steel plate, the pull plate is welded with the connecting plate and the frame steel plate, and the top plate is welded with the frame steel plate, the connecting plate and the pull plate.

As a further improvement of the above technical solution: the concrete main body is a UHPC main body.

As a further improvement of the above technical solution: the shear pieces and the high-strength bolts are provided with a plurality of rows, and the rows are staggered mutually.

As a further improvement of the above technical solution: and a gap is reserved between the hole for the high-strength bolt to pass through on the steel main beam and the high-strength bolt.

As a further improvement of the above technical solution: the steel girder is hot-rolled steel, and the steel girder includes a plurality of sections, passes through concatenation steel sheet and high strength bolt fixed connection between the adjacent section.

As a further improvement of the above technical solution: the steel girder is an H-shaped section beam, each hole of the steel girder comprises three sections, the thickness of the flange of the middle section is larger than that of the flanges of the two end sections, the thickness of the flange of the middle section of the side span is the same as that of the flange of the middle section of the midspan, and the thickness of the flange of the two end sections of the side span is larger than that of the flange of the two end sections of the midspan.

As a further improvement of the above technical solution: and a steel beam is arranged between every two adjacent steel girders, vertical stiffening plates and horizontal stiffening plates are arranged on the steel girders, and the vertical stiffening plates and the horizontal stiffening plates are fixedly connected with the steel beam through splicing steel plates and high-strength bolts.

A construction method of the composite structure bridge comprises the following steps:

s1: prefabricating steel main beam segments, steel cross beams and prefabricated bridge decks in a factory;

s2: transporting the steel girders to a construction site, completing splicing of each hole of steel girder on the ground, hoisting the steel girders through the whole holes of a crane, and installing a steel beam after all the steel girders in one hole are hoisted in place;

s3: constructing hole by hole, and then longitudinally connecting the steel main beams;

s4: the prefabricated bridge deck is transported to a construction site, and the prefabricated bridge deck is hoisted in a whole block by a crane so that the high-strength bolt at the lower side of the lower connecting steel plate penetrates through a preset hole position on the steel girder to realize primary positioning;

s5: after all the prefabricated bridge deck plates of all the holes are hoisted in place, the prefabricated bridge deck plates which are longitudinally adjacent are tightly propped, then the connecting plates are connected and fastened through high-strength bolts to form a whole, and after the construction of each hole is finished, the prefabricated bridge deck plates between two adjacent spans are synchronously connected;

s6: and connecting and fastening the prefabricated bridge deck and the steel main beam to form an integral structure.

Compared with the prior art, the assembled composite structure bridge has the advantages that:

1) the whole structure is prefabricated in a factory, welding construction is not needed on the site, and the steel girder can be factory hot-rolled H-shaped steel, so that the quality is good and the unit price is low; the concrete main body is poured, vibrated and steamed in a factory in a programmed way, the factory size is standard, the strength is uniform, and the controllability of the structural quality is excellent.

2) The transverse spacing of the steel main beams is about 2.8m, the UHPC (ultra high performance concrete) bridge deck is adopted, the thickness is only 14cm, the design requirements on strength and rigidity can be met, the transverse prestress of the bridge deck is not needed, and the structure is simple and reliable; compared with the common concrete material, the thickness of the plate is greatly reduced, and the self weight is reduced by 40%; after the UHPC is adopted by the bridge deck slab, the dead weight of the bridge structure is greatly reduced, and the hot-rolled H-shaped steel can be used as a main beam to bear main load.

3) The upper structure of the full bridge is light in weight, high in strength and strong in combined stress capacity, the high span ratio is reduced to 1/30 from 1/18-1/25, the linear position can be reduced, the length of the bridge is reduced, the adaptability to the under-bridge clearance is strong, and the advantages are obvious.

4) The bridge maintenance system is light and small in weight, is designed without closure, is not difficult for people to reach, is convenient to overhaul in the operation period, and is easy to make a bridge maintenance and regular inspection plan.

5) The full-structure bolt connection provides convenience for maintenance and replacement of components in the operation period, and can realize the dismantling, recycling and reusing of the bridge under the later special condition, and the service life cycle is good in economy.

The construction method of the assembled composite structure bridge has the advantages that:

1) the single-hole single steel main beam is generally 7t heavy, the single prefabricated bridge deck plate is 24t (30m prefabricated small box girder is generally 115t heavy), the total quality of the structure is far lower than that of the conventional form, the installation requirement can be met according to the hoisting capacity of the conventional crane, conventional equipment is utilized to the maximum extent, and the investment is saved.

2) The crane construction can accomplish to stop promptly and walk promptly, and occupation and the influence to the place are little, and this scheme is very fit for the overhead dilatation engineering to current urban road.

3) The whole structure is spliced only by using high-strength bolts in a construction site, no shear nails and no steel structure welding are used in the site construction, no concrete is cast in place, no working procedures such as UHPC steam curing and the like are used, the construction is very quick, and the quality is uniform and controllable.

Drawings

Fig. 1 is a schematic perspective view of a fabricated composite structural bridge according to the present invention.

Fig. 2 is a perspective view illustrating a prefabricated bridge deck according to the present invention.

Fig. 3 is a partially enlarged view of fig. 2.

Fig. 4 is a schematic perspective view of the prefabricated bridge deck of the present invention with the concrete body removed.

Fig. 5 is a partially enlarged view of fig. 4.

Fig. 6 is a perspective view of the steel main beam according to the present invention.

Fig. 7 is a schematic perspective view of a steel cross member according to the present invention.

Fig. 8 is a schematic structural view illustrating the prefabricated bridge deck being jacked up by using jacks.

The reference numerals in the figures denote: 1. a steel main beam; 11. a vertical stiffener plate; 12. a horizontal stiffener plate; 2. prefabricating a bridge deck; 21. a concrete body; 22. a lower connecting steel plate; 23. a frame steel plate; 24. a shear member; 25. a high-strength bolt; 26. a connecting plate; 27. pulling a plate; 28. a top plate; 3. a steel beam.

Detailed Description

The invention is described in further detail below with reference to the figures and specific examples of the specification.

As shown in fig. 1 to 8, the steel girder 1 is a hot-rolled section steel H-shaped section, the performance is good, the unit price is low, in this embodiment, a standard span of one hole 30m is taken as an example, the single-hole steel girder 1 is divided into 3 sections, different thicknesses are adopted, on the premise of meeting the stress requirement, the self weight of the steel girder 1 is further reduced, the steel girder 1 comprises a web plate, an upper flange plate, a lower flange plate, a vertical stiffening rib and a horizontal stiffening rib 12, and the plate sizes of the steel girder 1 formed by the midspan and the side span are different. The beam height of the midspan steel girder 1 is 900mm, and the web plate thickness is 16 mm; the width of the upper flange and the lower flange of the middle section is 300mm, and the thickness of the upper flange and the lower flange of the middle section is 32 mm; the width of the upper flange and the lower flange of the two end sections is 300mm, and the thickness of the upper flange and the lower flange of the two end sections is 18 mm;

the width of the vertical stiffening rib 11 is 120mm, the thickness of the vertical stiffening rib is 11mm, the width of the horizontal stiffening rib 12 is 120mm, the thickness of the horizontal stiffening rib is 9mm, and the longitudinal bridge spacing position is 7.5 m; the height of the side span steel main beam 1 is 900mm, and the thickness of the web plate is 16 mm; the width of the upper flange and the lower flange of the middle section is 300mm, and the thickness of the upper flange and the lower flange of the middle section is 32 mm; the width of the upper flange and the lower flange of the two end sections is 300mm, and the thickness of the upper flange and the lower flange of the two end sections is 26 mm; the width of each vertical stiffening rib 11 is 120mm, the thickness of each vertical stiffening rib is 11mm, the width of each horizontal stiffening rib 12 is 120mm, the thickness of each horizontal stiffening rib is 9mm, and the longitudinal bridge spacing is 7.5 m;

the end part of a web plate of a section 1 of the steel girder is reserved with

Bolt holes are reserved on the upper flange

Bolt holes are reserved at the end parts of the lower flanges

The bolt holes, the vertical stiffening ribs 11 and the horizontal stiffening ribs 12 are all pre-welded with spliced steel plates with bolt holes.

The transverse spacing of the steel main beams 1 is 2.8m, the middle parts of the steel main beams are connected by steel cross beams 3 with I-shaped cross sections, and the longitudinal spacing of the steel cross beams 3 is 7.5m (namely corresponding to stiffening ribs on the steel main beams 1); the steel beam 3 adopts standard size and is further subdivided into a middle beam and a pier top beam, wherein the height of the middle beam is 350mm, the thickness of a web plate is 9mm, the width of a flange is 250, and the thickness of the flange is 14 mm; the pier top beam is 500mm in height, the web plate is 11mm in thickness, the flange width is 300, and the thickness is 18 mm.

The length of the single prefabricated bridge deck 2 in the longitudinal bridge direction is 3.0m, the length of the single prefabricated bridge deck 2 in the transverse bridge direction is 15.5m, the plate thickness is 14cm, and the weight of the single prefabricated bridge deck is 23 t. The bridge deck prefabricated structure comprises a UHPC main body and a steel plate connecting frame.

The bridge deck steel connecting structure mainly comprises a connecting steel plate 26,Frame steel plate 23, pulling plate 27, top plate 28, lower connecting steel plate 22. The connecting steel plate 26, the frame steel plate 23, the pulling plate 27, the top plate 28 and the lower connecting steel plate 22 are all connected together in a factory prefabrication welding mode, wherein the connecting steel plate 26 is a butt plate of two longitudinally adjacent prefabricated bridge deck plates 2, the thickness of the butt plate is 10mm, and bolt hole sites for connecting bridge decks are reserved; the frame steel plate 23 is a connecting plate with a UHPC main body, the thickness of the connecting plate is 14mm, and the side surface connected with the UHPC is welded with the frame steel plate

Shear nails; the pulling plates 27 are connecting plates between the connecting steel plates 26 and the frame steel plates 23, the thickness is 20mm, the number of the pulling plates is 30, and the transverse bridge spacing is 560 mm; the top plate 28 is used for keeping the surface of the prefabricated bridge deck 2 flat and has the thickness of 10 mm; the lower connecting steel plate 22 has the thickness of 12mm, 6 blocks in the transverse bridge direction, and the upper side for connecting with UHPC is welded with

A shear pin welded to the lower side of the steel main beam 1

High-strength bolt.

The jack is adopted in the jacking procedure and comprises a jack main body structure, a positioning steel plate and a supporting steel plate, wherein bolt holes are reserved in the positioning steel plate, the hole diameter and the space are the same as those of the upper flange reserved holes of the steel girder 1, and the jack is convenient to fix on the steel girder 1.

In the construction method of the embodiment, the steel girder 1 segment and the prefabricated bridge deck 2 are prefabricated in a factory and transported to a construction site. During construction, firstly, splicing of steel beams in each hole is completed on site, then the steel beams are hoisted in place, and the steel beams 3 are connected; after the steel beams are all in place, hoisting the prefabricated bridge deck 2 to the position above the installation position by using a crane, and enabling reserved bolts at the lower part of the lower connecting plate 22 to penetrate through corresponding bolt holes at the upper flange of the steel main beam 1; after each hole prefabricated bridge deck 2 is hoisted in place, the prefabricated bridge deck 2 is tightly propped and bolted; and after the prefabricated bridge deck 2 is completely connected, bolting the prefabricated bridge deck 2 and the steel girder 1, specifically the lower connecting plate 22 and the upper flange of the steel girder 1 to complete the integral structure.

The concrete construction method for the fabricated composite structure bridge comprises the following steps:

on one hand, the section steel main beam sections (three sections in the embodiment) are processed and manufactured by a section steel manufacturing factory, after the sections are completed, the hole forming of each section of main beam, the manufacturing and hole forming of the stiffening ribs and the welding of the shear nails are completed in the factory, the main beam is transported to a construction site after the hole forming, and the bolt splicing of each hole of the steel main beam is completed on the site.

Hoisting the steel beams by using a crane hole by hole, wherein 6 steel beams are arranged in each hole, and the beam distance is 2.8 m. After 6 girder steels reach predetermined position, connect steel crossbeam 3: firstly, bolting the pier top cross beam, and then installing the middle cross beam.

And finishing the steps one by one, and primarily connecting the two vertically adjacent hole steel beams through the splicing steel plates (namely the bolts are not screwed at the moment) until the steel beams are completely connected in place.

On the other hand, each plate and the shear nails of the steel connecting frame of the bridge deck 2 are prefabricated by a steel processing factory, welding work is completed, the steel connecting frame is transported to a special bridge deck production base, pouring, vibrating and steam curing work of UHPC is completed, and the bridge deck is transported to a construction site after being formed.

Hoisting the prefabricated bridge deck plates 2 to the mounting position one by using a crane, enabling the lower bolts to penetrate through the holes of the upper flange of the steel girder 1, and screwing (pre-tightening) the high-strength bolts; after the hoisting of each hole of the bridge deck is finished, a jack is installed and the bridge deck is tightly propped against the bridge deck, so that the longitudinal gap of the prefabricated bridge deck 2 is eliminated; the adjacent deck slab is then bolted (fully tightened) with high-strength bolts until the deck is fully installed and connected.

After the steel girder 1 and the prefabricated bridge deck 3 are completely installed, the connecting bolts between the steel girder segments and the connecting bolts between the prefabricated bridge deck 2 and the steel girder 1 are screwed down to form an integral structure.

And finally, completing the construction of the auxiliary facilities of the bridge deck.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.

Claims

1. The utility model provides an assembled integrated configuration bridge which characterized in that: including two piece at least steel girder (1) and two piece at least prefabricated decking (2), prefabricated decking (2) include two with steel girder (1) vertically frame steel sheet (23), be located concrete main part (21) between two frame steel sheet (23) and two connecting plate (26), two set firmly two at least lower steel sheet (22) parallel with steel girder (1) between frame steel sheet (23), concrete main part (21) lay in down on steel sheet (22), lower steel sheet (22) upside with frame steel sheet (23) inboard all sets firmly shear part (24) that are used for connecting concrete main part (21), two connecting plate (26) branch is located two the outside of frame steel sheet (23), set firmly polylith arm-tie (27) between connecting plate (26) and the frame steel sheet (23) of homonymy, the connecting plates (26) of two adjacent prefabricated bridge deck plates (2) are fixedly connected through high-strength bolts (25), and the lower side of each lower connecting steel plate (22) is fixedly provided with the high-strength bolts (25) and is fixedly connected with the steel main beams (1) in a one-to-one correspondence mode through the high-strength bolts (25).

2. The fabricated composite structural bridge of claim 1, wherein: the prefabricated bridge deck (2) further comprises a top plate (28), the top plate (28) is fixedly arranged on the frame steel plate (23), the connecting plate (26) and the pulling plate (27), and the upper surface of the top plate (28) is flush with the upper surface of the concrete main body (21).

3. The fabricated composite structural bridge of claim 2, wherein: the shearing pieces (24) are welded with the frame steel plates (23), the pull plates (27) are welded with the connecting plates (26) and the frame steel plates (23), and the top plates (28) are welded with the frame steel plates (23), the connecting plates (26) and the pull plates (27).

4. The fabricated composite structural bridge of claim 1, 2 or 3, wherein: the concrete main body (21) is a UHPC main body.

5. The fabricated composite structural bridge of claim 1, 2 or 3, wherein: the shear pieces (24) and the high-strength bolts (25) are provided with a plurality of rows, and the rows are staggered with each other.

6. The fabricated composite structural bridge of claim 1, wherein: and a gap is reserved between a hole for the high-strength bolt (25) to pass through on the steel main beam (1) and the high-strength bolt (25).

7. The fabricated composite structural bridge of claim 1, wherein: the steel girder (1) is hot-rolled steel, the steel girder (1) comprises a plurality of sections, and adjacent sections are fixedly connected through splicing steel plates and high-strength bolts (25).

8. The fabricated composite structural bridge of claim 7, wherein: the steel girder (1) is an H-shaped section beam, each hole of the steel girder (1) comprises three sections, the thickness of the flange of the middle section is larger than that of the flanges of the two end sections, the thickness of the flange of the middle section of the side span is the same as that of the flange of the middle section of the midspan, and the thickness of the flange of the two end sections of the side span is larger than that of the flange of the two end sections of the midspan.

9. The fabricated composite structural bridge of claim 6, 7 or 8, wherein: the steel girder comprises two adjacent steel girders (1), wherein steel crossbeams (3) are arranged between the two adjacent steel girders (1), vertical stiffening plates (11) and horizontal stiffening plates (12) are arranged on the steel girders (1), and the vertical stiffening plates (11) and the horizontal stiffening plates (12) are fixedly connected with the steel crossbeams (3) through splicing steel plates and high-strength bolts (25).

10. A construction method of the fabricated composite structural bridge as claimed in claims 1 to 9, wherein: the method comprises the following steps:

s1: prefabricating sections of a steel main beam (1), steel cross beams (3) and prefabricated bridge decks (2) in a factory;

s2: the steel main beams (1) are transported to a construction site, splicing of the steel main beams (1) in each hole is completed on the ground, the steel main beams (1) are hoisted in whole holes through a crane, and the steel cross beams (3) are installed after the steel main beams (1) in one hole are hoisted in place;

s3: constructing hole by hole, and then longitudinally connecting the steel main beams (1);

s4: the prefabricated bridge deck (2) is transported to a construction site, and the whole block of the crane is used for hoisting so that the high-strength bolt (25) at the lower side of the lower connecting steel plate (22) penetrates through a preset hole position on the steel girder (1) to realize primary positioning;

s5: after all the prefabricated bridge deck slabs (2) in each hole are hoisted in place, the prefabricated bridge deck slabs (2) which are longitudinally adjacent are jacked tightly, then the connecting plates (26) are connected and fastened into a whole through high-strength bolts (25), and after the construction of each hole is finished, the prefabricated bridge deck slabs (2) between two adjacent spans are synchronously connected;

s6: and connecting and fastening the prefabricated bridge deck (2) and the steel girder (1) to form an integral structure.