JP4409587B2 - Precast composite beam consisting of steel and concrete beams - Google Patents

Description

  The present invention relates to a precast composite beam composed of a steel beam and a concrete beam used as a structural material for a main girder of a bridge or a floor of a building.

  Conventionally, as the main girder of the bridge, an H-shaped steel material having an upper flange at the upper end of the web and a lower flange at the lower end is used, and the entire upper flange, web and lower flange of the H-shaped steel material are embedded in the concrete, Further, a precast composite girder composed of an H-shaped steel beam, an upper flange concrete beam, a lower flange concrete beam and a web concrete having a structure in which reinforcing bars are arranged along the upper surface of the upper flange and embedded in the upper flange concrete is known. .

  The above-mentioned precast composite girder is called a pre-beam, and a plurality of precast composite girders are juxtaposed in the bridge width direction with the lower flange concrete beam embedding the lower flange on the bridge pier, and the upper flange is embedded. It is a structure in which a concrete floor slab is formed by a flange concrete beam, and is a structural material that is designed with strength by an H-shaped steel material having upper and lower flanges and concrete that covers the upper and lower flanges and the web.

  However, the precast composite girder composed of the above H-shaped steel material and the concrete in which the entire H-shaped steel material is embedded is very expensive and heavy, and increases the overall bridge cost such as bridge design and erection work including bridge pier design. It is the cause.

  Furthermore, the precast composite girder in which the entire H-shaped steel material is embedded in the concrete lacks the rationality that allows for an unnecessarily high strength margin, and is required to be improved.

  The present invention fundamentally reviews the structure of the H-shaped steel material in the preceding example and the precast composite girder in which the whole is embedded with concrete, and intends to solve the problem.

Precast composite beams made of steel beams and concrete beams according to the present invention includes a main girder or box-shaped steel beam that is used as a structural material of the floor of the building of bridges, to limit the parallel web the upper end of the box section steel beams having a basic structure consisting disposed a concrete beam Te.

Precast composite beams according to the present invention when Yojutsu uses a long box-shaped steel beams to a plurality of parallel webs from the upper surface of the seat plate in the erection direction launched together, the box parallel web upper end of the box section steel beams comprising a Turkey Nkurito beam extends parallel to the shaped steel beams, with take structure of burying the parallel web upper end 該Ko Nkurito beams, embedded in the upper logger Nkurito the beam and inserted through the reinforcement to the parallel web upper and achieving integral rigid structured by, as well as a bridging unit drives out the seat plate of the box-shaped steel beams, in which the upper logger Nkurito beam was concrete slab forming unit I following.

The structure of the composite by the above Symbol box section steel beams and concrete beams and the web transmural interpolation strong muscles, those which attained significant weight and cost of the precast composite beams.

The present invention while implementing the basic structure complexed on Symbol box section steel beams and concrete beams, to a structure projecting left and right joint from the left and right sides of the concrete beam.

The left and right joints are formed by left and right U-shaped bars projecting from the left and right side surfaces of the concrete beam, and at least one leg is embedded while a pair of leg base ends of the U-shaped bars are embedded in the concrete beam. The part is inserted into the upper end of the parallel web, and the U-shaped bar is used as a reinforcing bar embedded in the concrete beam, and functions as a left and right joint means.

The composite beam on piers drives out seat plate of the box-shaped steel beams, or beam receiving device while erection with intervals in parallel supported buildings, with allowed to protrude the fitting into intervals of the precast composite beams The cast-in-place concrete is cast within the interval to embed the joint, and a concrete floor slab of a bridge or a building is formed with the concrete beam and cast-in-place concrete.

  The precast composite beam according to the present invention can achieve significant weight reduction at low cost while satisfying required strength.

  The best mode for carrying out the present invention will be described below with reference to FIGS.

  The present invention eliminates the H-shaped steel material in the preceding example and the structure in which the whole is embedded with concrete, and the precast composite beam P composed of the steel beam 1 and the concrete beam 2 that drastically solves the above problems inherent in the structure. Is to provide.

  The precast composite beam P is used as a structural member for a bridge main girder or building floor, and is limited to a T-shaped steel beam or box-shaped steel beam 1 and the upper end 4 (web free end) of both webs 3. It has a basic structure consisting of a single concrete beam 2 arranged.

  The precast composite beam P shown in FIGS. 1 to 7 uses a T-shaped steel beam 1 that is long in the erection direction in which the web 3 is integrally raised from the upper surface of the seat plate 5, and the upper end of the web 3 of the T-shaped steel beam 1. 4, a concrete beam 2 extending in parallel with the T-shaped steel beam 1 is disposed, the upper end of the web 3 is embedded in the concrete beam 2, and a reinforcing bar 6 is inserted into the upper end of the web 3 so as to be inside the concrete beam 2. It has a configuration embedded in.

  The precast composite beam P shown in FIGS. 11 and 12 uses a box-shaped steel beam 1 which is long in the erection direction in which a plurality of parallel webs 3 are integrally raised from the upper surface of the seat plate 5. A concrete beam 2 extending in parallel with the box-shaped steel beam 1 is provided at the upper end of the parallel web 3, the upper end 4 of the parallel web 3 is embedded in the concrete beam 2, and a reinforcing bar 6 is provided at the upper end 4 of the parallel web 3. It has a configuration that is inserted and embedded in the concrete beam 2.

  As described above, the precast composite beam P is a single-concrete steel beam 1 or a single box-shaped steel beam 1 and a single concrete disposed only on the upper end 4 of the single web 3 or the upper end of the parallel web 3 of each steel beam 1. It has a composite beam structure consisting of beams 2.

  As shown in FIG. 13 and the like, the seat plate 5 of the T-shaped steel beam 1 or the box-shaped steel beam 1 is provided as a erection means on the bridge pier 7 in the bridge or on the beam receiver of the building, and the concrete beam 2 is used. It serves as a means for forming a concrete floor slab 8 in a bridge or a building.

  For example, in the case of a bridge, a plurality of precast composite beams P (concrete beams 2) are arranged in parallel in the bridge width direction while loading the lower surface of the seat plate 5 on the upper surface of the support 15 installed on the seat surface of the pier 7. A floor slab 8 is formed. A concrete layer and / or an asphalt layer 22 is cast on the top surface of the concrete floor board 8.

  The beam structure in which the T-shaped steel beam 1 or the box-shaped steel beam 1 is combined with the single concrete beam 2 eliminates the H-shaped steel material and the entire structure covered with concrete in the preceding example, and greatly reduces the weight and cost. Go down.

  In addition, while carrying out a basic structure in which the T-shaped steel beam or box-shaped steel beam 1 and the single concrete beam 2 are combined, left and right joints 9 are protruded from the left and right side surfaces (side surfaces extending in the bridge length direction) of the concrete beam 2. Make the structure.

  FIGS. 1 to 6 show a case where U-shaped bar 10 is projected from the left and right side surfaces of the concrete beam 2 as a specific example of the left and right joint 9.

  More specifically, at least one leg 10a is inserted into the upper end 4 of the web 3 while the base ends of the left and right U-shaped bars 10 are embedded in the concrete beam 2, and the reinforcing bars 6 are inserted. In addition, the U-shaped bent portion 10b of the left and right U-shaped bar 10 protrudes from the left and right side surfaces of the concrete beam 2 to form a large number of left and right joints 9 arranged at intervals in the web longitudinal direction. The U-shaped bar 10 functions as a joint while functioning as a reinforcing bar embedded in the concrete beam 2.

  2 is a front view showing only the left joint 9 in FIG. 5 and omitting the right joint 9, and FIG. 3 is a front view showing only the right joint 9 in FIG. 5 and omitting the left joint 9.

  As shown in FIGS. 4, 11, and 12, the upper end 4 of the web 3 of the T-shaped steel beam 1 or the box-shaped steel beam 1 includes a plurality of reinforcing bar insertion holes 11 in two rows in the vertical direction. The reinforcing bar insertion holes 11 in the upper row and the reinforcing bar insertion holes 11 in the lower row are arranged at the same interval and are shifted in the longitudinal direction of the web 3.

  The n-th left and right joints 9 from the end of the concrete beam 2 in the bridge length direction will be described. The upper leg (or lower leg) 10a of the left U-shaped bar 10 is connected to the upper (or lower) reinforcing bars. While inserting into the penetration hole 11, the lower leg part (or upper leg part) 10a of the right U-shaped bar 10 is penetrated to the reinforcement reinforcement penetration hole 11 of a lower row (or upper row), and right and left U-shaped bar material Ten pairs of leg portions (upper and lower leg portions) 10 a are embedded in the concrete beam 2 to form reinforcing bars 6.

  When the parallel web 3 is described again, the upper leg portion (or the lower leg portion) of the U-shaped bar 10 that forms the right joint 9 in the reinforcing bar insertion hole 11 in the upper row (or lower row) provided in both webs 3. ) A lower leg portion (or upper leg portion) 10a of the U-shaped bar 10 which inserts the left joint 9 in the lower row (or upper row) reinforcing bar insertion hole 11 provided in both webs 3 Insert.

  In any of the above cases, the U-shaped bent portion 10 b forming the joint 9 is oriented substantially perpendicular to the bridge length direction axis of the concrete beam 2.

  As shown in FIG. 13, the precast composite beam P is installed on the bridge pier 7 with the seat plate 5 or in parallel with the beam receiver of the building while being spaced in parallel. The joint 9 is protruded to the wall, and cast-in-place concrete 12 is placed in the interval to bury the joint 9, and the concrete beam 2 and cast-in-place concrete 12 form a concrete floor slab 8 of a bridge or a building. To do.

  At this time, the joint 9 made of the U-shaped bar 10 of each precast composite beam P can be connected to the joint 9 of the adjacent precast composite beam P in the longitudinal direction by arranging the reinforcing bar penetration holes 11 as described with reference to FIG. And the overlapping portions can be bound and connected with a connecting wire.

  The left and right U-shaped bar 10 can insert a pair of leg portions 10 a into the web 3. In this case, the arrangement structure of the reinforcing bar insertion holes 11 described with reference to FIG. 4 is not adopted. For example, two pairs of reinforcing bar insertion holes 11 into which the pair of leg portions 10a are inserted into the upper end 4 of the web are spaced in the longitudinal direction of the web. In other words, the left joint 9 and the right joint 9 can be alternately embedded in the cast-in-place concrete 12 by being spaced apart from each other in the longitudinal direction without overlapping in the longitudinal direction of the web.

  Next, FIG. 7 shows a case where the reinforcing bar 6 and the joint 9 are constituted by the straight bar member 13. In this illustration, the intermediate part of the straight bar 13 is penetrated into the reinforcing bar penetration hole 11 of the single web upper end 4 of the T-shaped steel beam 1 or the reinforcing bar penetration hole 11 of the parallel web upper end 4 of the box-shaped steel beam 1. The left and right joints 9 are configured by inserting and embedding in the concrete beam 2 and projecting both ends of the straight bar 13 from the left and right side surfaces of the concrete beam 2.

  In this case, a plurality of reinforcing bar insertion holes 11 are provided above and below the upper end of the web 3, and a straight bar member 13 is inserted into each of them to form a joint 9 composed of a plurality of bar members. As in the case of using the U-shaped bar 10, the joint 9 overlaps between adjacent precast composite beams P and is embedded in the cast-in-place concrete 12. The overlapping portion can be connected and connected with a connecting wire.

  Next, FIG. 8 to FIG. 10 show an example in which the joint 9 is constituted by a section steel 14 such as an L-shaped steel, an H-shaped steel, or a T-shaped steel having a relatively small diameter.

  In the above example, the intermediate part of the section steel 14 is inserted into the reinforcing bar insertion hole 11 at the upper end 4 of the single web of the T-shaped steel beam 1 or the reinforcing bar insertion hole 11 at the upper end 4 of the parallel web of the box-shaped steel beam 1. The left and right joints 9 are configured by being embedded in the concrete beam 2 and functioning as the reinforcing bars 6 and projecting both ends of the shaped steel 14 from the left and right side surfaces of the concrete beam 2.

  As shown in FIG. 9, the joint 9 made of the above-mentioned shape steel 14 is arranged so that the end faces of the adjacent precast composite beams P face each other on the same axis, as described in FIG. Embedded in cast-in-place concrete 12.

  Alternatively, as shown in FIG. 10, the joint 9 made of the shape steel 14 is embedded in the cast-in-place concrete 12 so as to overlap with the shape steel joint 9 of the adjacent precast composite beam P.

  When the joint 9 is formed by the shape steel 14, each joint 9 can be connected to each joint 9 of the adjacent precast composite beam P by using the connection hardware 16.

  14 to 16 show that the precast composite beam P composed of the steel beam 1 and the concrete beam 2 is not provided with the joint 9, but a plurality of composite beams P not having the joint 9 are in contact with or close to each other in the bridge length direction side surface. Thus, the case where the concrete floor slab 8 of a bridge or a building is formed in parallel in the bridge width direction is shown.

  More specifically, the precast composite beam P is composed of the T-shaped steel beam 1 or the box-shaped steel beam 1 and the single concrete beam 2 disposed only on the upper end 4 of the single web 3 or the parallel web 3. It has a basic structure in which the web upper end 4 is embedded in the beam 2.

  The single concrete beam 2 is provided with a fastening strip material insertion hole 17 that passes straight through the inside of the beam 2 and the upper end 4 of the web 3, and a fastening strip material such as a fastening rod or a fastening cable is provided in the penetration hole 17. 18 is inserted and the all single concrete beam 2 is fastened. Therefore, a concrete floor slab 8 of a bridge or a building is formed. A concrete layer and / or an asphalt layer 22 is cast on the top surface of the concrete floor board 8.

  The fastening strip material insertion hole 17 can be formed by inserting the elongated pipe material 19 into the single concrete beam 2 while penetrating the upper end 4 of the web 3. That is, the fastening material through-holes that are opened on the left and right side surfaces of the single concrete beam 2 are formed in the tube holes of the elongated tube material 19. In this case, the elongated pipe material 19 functions as a reinforcing bar for the single concrete beam 2. Alternatively, another reinforcing bar 6 made of the bar can be embedded in the concrete beam 2 while penetrating the web upper end 4 while the elongated pipe member 19 functions as a reinforcing bar.

  In other words, the precast composite beam P not having the joint 9 is placed on the bridge pier 7 of the bridge or the beam receiver of the building with the seat plate 5 of the T-shaped steel beam 1 or the box-shaped steel beam 1. A plurality of precast composite beams P are mounted in parallel in the bridge width direction and fastened by the fastening strip 18 as described above to form the concrete floor slab 8 in the bridge or building.

  The precast composite beam P shown in FIGS. 14 to 16 is constructed on site without using the cast-in-place concrete 12.

  The T-shaped steel beam 1 or the box-shaped steel beam 1 forming the precast composite beam P described in each example includes a case where a steel plate forming the web 3 and a steel plate forming the seat plate 5 are welded.

  In addition, as shown in FIGS. 13 and 16, the precast composite beam P in each example is laid horizontally on the bridge pier 7 or the beam support with the lower half of the web 3 and the seat plate 5 being bare. Thereafter, the lower half of the web 3 is embedded in the cast-in-place web-embedded concrete 23. That is, cast-in-place concrete can be placed between the lower surface of the single concrete beam 2 and the seat plate 5, and the lower half of the web 3 can be embedded in the cast-in-place concrete.

  Further, in each of the above examples, the U-shaped bar 10, the straight bar 13, the elongated pipe 19, and the connecting strip 18 may be made of metal or non-metal such as fiber reinforced plastic. .

  Further, in the cast-in-place concrete 12, another reinforcing bar 20 such as a reinforcing bar made of a braid with the joint 9 is embedded. Similarly, in addition to the reinforcing bar 6, another reinforcing bar 21 combined with the reinforcing bar 6 can be embedded in the single concrete beam 2.

The perspective view of the precast compound beam which consists of a T-shaped steel beam and concrete beam which formed the right-and-left joint using U-shaped bar. Sectional drawing which shows the front view which shows the precast compound beam which consists of a T-shaped steel beam and concrete beam which formed the joint using the U-shaped bar material only with the left joint. Sectional drawing which shows the front view which shows only the right joint the precast compound beam which consists of a T-shaped steel beam and concrete beam which formed the joint using the U-shaped bar. The side view explaining the example of arrangement | positioning of the reinforcement reinforcement penetration hole arranged in the web upper end of the said T-shaped steel beam or a box-shaped steel beam. Sectional drawing which makes the front view the precast compound beam which consists of a T-shaped steel beam and a concrete beam which formed the right and left joint using U-shaped bar material. The top view of the precast compound beam which consists of a T-shaped steel beam and a concrete beam in FIG. Cross-sectional view of a precast composite beam consisting of a T-shaped steel beam and a concrete beam using straight bars made of left and right joints (can be applied to a box-shaped steel beam). Cross-sectional view of a precast composite beam consisting of a T-shaped steel beam and a concrete beam with left and right joints made of section steel, and can be used for box-shaped steel beams. Sectional drawing which shows the example which made the joint end surface formed with the shape steel of FIG. 8 contact | abutted or adjoined the adjacent joint end surface. Sectional drawing which shows the example which made the coupling formed with the shape steel of FIG. 8 and the adjacent coupling overlapped. Sectional drawing which makes the front view the precast compound beam which consists of a box-shaped steel beam and a concrete beam which formed the right-and-left joint using U-shaped bar material. The top view of the precast compound beam which consists of a box-shaped steel beam and a concrete beam in FIG. It is sectional drawing which shows the construction example of the precast composite beam which consists of a steel beam and a concrete beam in each illustration, and is a figure explaining the construction example as a typical example of the precast composite beam which consists of a T-shaped steel beam and a single concrete beam. A perspective view of a precast composite beam consisting of a T-shaped steel beam and a concrete beam that do not form a joint (can be applied to a box-shaped steel beam). Sectional drawing which looks at the front view of the precast compound beam which consists of a T-shaped steel beam and a concrete beam which do not form a joint. Sectional drawing which shows the construction example of the precast composite beam which consists of a T-shaped steel beam and concrete beam which do not form a joint.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... T-shaped steel beam or box-shaped steel beam, 2 ... Concrete beam, 3 ... Web, 4 ... Upper end of web, 5 ... Seat plate, 6 ... Reinforcement, 7 ... Bridge pier, 8 ... Concrete floor board, 9 ... Left and right joint DESCRIPTION OF SYMBOLS 10 ... U-shaped bar material, 11 ... Reinforcing bar penetration hole, 12 ... Cast-in-place concrete, 13 ... Straight bar material, 14 ... Shape steel, 15 ... Support, 16 ... Connection metal fitting, 17 ... Fastening material penetration hole , 18 ... fastening strip material, 19 ... elongated tube material, 20, 21 ... reinforcing bar, 22 ... concrete layer or / and asphalt layer, 23 ... web-embedded concrete, P ... precast composite beam.

Claims (3)

  Using a box-shaped steel beam that is long in the erection direction in which a plurality of parallel webs are integrally raised from the upper surface of the seat plate, a concrete beam extending in parallel with the box-shaped steel beam is provided at the upper end of the parallel web of the box-shaped steel beam, The concrete beam has a structure in which the upper end of the parallel web is embedded, a reinforcing bar is inserted into the upper end of the parallel web, and embedded in the concrete beam. Precast composite beam consisting of steel beam and concrete beam, characterized in that is a concrete floor slab forming means. Precast composite beams consisting claim 1 Steel beams and concrete beams, wherein the having the right and left fitting which projects from the left and right sides of the concrete beam. The left and right joints are formed of left and right U-shaped bars projecting from the left and right sides of the concrete beam, and a pair of leg base ends of the U-shaped bars are embedded in the concrete beam and at least one leg The precast composite beam comprising a steel beam and a concrete beam according to claim 2 , wherein the upper end of the web is inserted through the upper end of the web.

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