JPH0594402U - Half PC crossbeam structure - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the workability of connecting half-PC girders and girders. [Structure] The half-PC girder 2 includes a step portion 4 on which the half-PC girder 3 is placed, and a stirrup streak 5 extending in a direction orthogonal to the step portion 4. The stirrup streak 5 is arranged between the half PC girder 2 and the half PC girder 3. Concrete 7 is placed between the half PC girder 2 and the half PC girder 3. [Effect] Since the half-PC beam is mounted on the stepped portion of the half-PC girder, use of a gusset plate and the necessity of providing a bracket can be eliminated, and the workability of connecting the half-PC beam can be improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a joint structure for half-PC girders, and more particularly to a joint structure for half-PC girders to which half-PC girders are connected.

[0002]

[Prior Art]

 Conventionally, half-PC girders are bridged between reinforced concrete columns, half-PC girders are bridged between these half-PC girders, and concrete is placed on these half-PC girders and half-PC girders. .. A gusset plate method and a bracket method are known for joining the half-PC large beam and the half-PC small beam.

In the gusset plate method, when precast concrete (PC) made of steel-framed reinforced concrete (SRC) is used for each beam, the steel frame is crossed from the half-PC girder in a direction orthogonal to its extending direction. Are exposed, the steel frames are exposed from the ends of the half-PC beam, the ends of a plurality of gusset plates are joined to these steel frames, and concrete is placed around these steel frames. On the other hand, when precast concrete (PC) made of reinforced concrete (RC) is used for each beam, a reinforcing plate is embedded in the joint of each beam, and the end of the reinforcing plate and the half-PC beam. The gusset plate buried in the bridge is joined and concrete is placed at the joints of these beams.

In the bracket method, a bracket is formed on the side wall of the half-PC girder so as to project, and the end of the half-PC girder is fitted into this bracket. The bracket is composed of a bottom portion that supports the bottom surface of the half-PC beam and side portions that support both side surfaces of the half-PC beam. Therefore, even when the SRC and RC PCs are used for each beam, the half PC girder is connected to the half PC girder without exposing the steel frame and the reinforcing bar.

[0005]

[Problems to be solved by the device]

 However, in the gusset plate method, since various reinforcing bars need to be welded and joined to the gusset plate to be buried, the shape is complicated and it can only enter at the end of the beam. It is difficult to obtain the required dimensional accuracy when joining beams, and forcible joining may lead to cracks, and improvements are desired. In the bracket method, since the formwork having a complicated shape is used for the large beam, the cost required for the formwork becomes great. Further, in a half-PC girder provided with a bracket, the bracket is exposed, which is not preferable in appearance.

The present invention effectively solves the above problems, and an object of the present invention is to provide a half PC girder joint structure with improved workability in connecting half PC girders and half PC girders.

[0007]

[Means for Solving the Problems]

 The half-PC girder joint structure of the present invention is a half-PC girder joint structure to which half-PC girders are connected. The half-PC girder has a side wall with an end of the half-PC girder. Is provided along the longitudinal direction of the half-PC girder, and a stirrup bar extends in a direction orthogonal to the stepped part, and the stirrup bar has an end connected to a cap tie. In addition, it is arranged between the side wall of the half PC girder and the end of the half PC girder, and concrete is placed between the side wall of the half PC girder and the end of the half PC girder. It is a feature.

[0008]

[Action]

 In the half-PC girder joint structure of the present invention, the end of the half-PC girder is placed on the step provided on the side wall of the half-PC girder. Since the stirrup streak extends in the direction perpendicular to the step, the mold for the half PC girder is demolded in the direction in which the stirrup streak extends. The stirrup streak is connected to the end of the half-PC girder and the end of the half-PC girder while the end is connected to the cap tie. The concrete is used to fix the stirrup stirrup because concrete is placed between the stairs and the section.

[0009]

【Example】

 An embodiment of the half PC girder joint structure of the present invention will be described below with reference to FIGS. As shown in FIG. 1, reference numeral 1 denotes a half-PC girder structure, reference numeral 2 denotes a half-PC girder, and reference numeral 3 denotes a half-PC girder. The stirrup streaks 22 are exposed on the upper wall surfaces of the half PC girders 2 and the half PC girders 3.

In the half-PC girder 2, as shown in FIG. 2, a step portion 4 on which an end portion of the half-PC girder 3 is placed is provided along the longitudinal direction of the half-PC girder 2. The joint portion structure 1 of the half PC girder 2 is formed in a convex shape in cross section, and the stirrup streak 5 extends in the direction orthogonal to the step portion 4.

The stirrup streak 5 is arranged between the side wall of the half-PC girder 2 and the end of the half-PC girder 3, and the upper end is connected to the cap tie 6 as shown in FIG. ing. The ends of the cap tie 6 and the stirrup streak 5 are inserted into the tubular clip 9 in an intersecting state, and are fastened with a fastener 10 provided on the clip 9. Here, the end portions of the cap tie 6 and the stirrup bar 5 may be joined by another joining method such as welding.

A concave cotter 8 is formed on the opposite surface of the side wall of the half PC girder 2 and the end of the half PC girder 3, and concrete 7 is placed on the step 4 between them. It has been cast.

A method of forming the half PC girder 2 in a factory or the like will be described with reference to FIG. As shown in FIG. 4, a plurality of main bars 16 are arranged parallel to the extending direction of the half-PC girder 2, and a stirrup bar 22 and a stirrup bar 5 are wound around the plurality of main bars 16, A beam form 15 is arranged around the. The beam formwork 15 is arranged on the bottom and side surfaces of the half PC girder 2. Here, the star-up bar 5 arranged in the joint section is composed of a head 17 arranged on the bottom surface of the half PC girder 2 and leg sections 18 arranged on both side surfaces. The reinforcement is arranged in a direction orthogonal to the extending direction of the girder 2.

A roughly rectangular parallelepiped connection form 19 is arranged around the leg portion 18. This joint mold 19 is provided with a through hole 20 for penetrating the leg portion 18, one side surface of which is in close contact with the beam mold 15 and the other side surface of which is formed with a convex portion forming the cotter 8. ing. Of course, the connection form 19 may be divided into two pieces with the through hole 20 interposed therebetween. After that, concrete is cast into the beam form 15 and the beam form 15 and the connection form 19 are removed to form the half PC girder 2.

A method of connecting the half-PC girder 3 to the half-PC girder 2 thus formed will be described. The half PC girder 2 is bridged between the pillars erected on the ground. The end of the half PC beam 3 is placed on the step 4 of the half PC beam 2, and the cap ties 6 are connected to both ends of the stirrup streak 5. Concrete 7 is cast on the step 4 between the half PC girder 2 and the half PC girder 3. After that, by placing concrete on the upper end surfaces of the half PC girder 2 and the half PC girder 3, the exposed stirrup streaks 22 and the cap ties 6 are covered with this concrete, as shown in FIG. As shown, the half-PC girder 2 and the half-PC girder 3 are integrally formed. Although only the beams are shown in this figure, usually the slabs are integrally formed at the same time.

In such a half-PC girder joint structure 1, since a step portion 4 is provided on the side wall of the half-PC girder 2 in the longitudinal direction thereof, the end portion of the half-PC girder 3 is attached to the step portion 4. Is placed. Since the stirrup reinforcement 5 extends in the direction orthogonal to the stepped portion 4, the joint form frame 19 of the half PC girder 2 is demolded in the extending direction of the stirrup reinforcement 5.

The stirrup streak 5 is connected at its end to the cap tie 6 and is arranged between the side wall of the half PC girder 2 and the end of the half PC girder 3, and these half PC girders are connected to each other. Since concrete 7 was placed between the side wall of 2 and the end of the half PC beam 3, the stirrup streak 5 is fixed by this concrete 7. The cap tie 6 is fixed to the concrete cast on the half PC girders 2 and the half PC girders 3.

According to the half PC girder joint structure 1 as described above, the step portion 4 on which the end of the half PC girder 3 is placed is provided on the side wall of the half PC girder 2, so that the gusset plate Since the use and the need to provide a bracket can be eliminated and the half PC girder 2 can be made into a simple shape, the cost required for the formwork of the half PC girder 2 can be reduced. Further, since the half-PC beam 3 is installed on the step portion 4, the workability of connecting the half-PC beam 3 can be improved. Since the stirrup reinforcement 5 extends in the direction orthogonal to the stepped portion 4, the connection form 19 can be demolded in the extending direction of the stirrup reinforcement 5.

The stirrup streak 5 is arranged between the side wall of the half PC girder 2 and the end of the half PC girder 3, and the side wall of the half PC girder 2 and the end of the half PC girder 3 are connected to each other. Since the concrete 7 is placed in between, the concrete 7 can fix the stirrup reinforcement 5, and the half PC girder 2 and the half PC girder 3 can be connected. Therefore, the half-PC girder 2 and the half-PC girder 3 can be firmly joined. Furthermore, since the cotters 8 are provided on the opposing surfaces of the half-PC girder 2 and the half-PC girder 3, the shear strength between the half-PC girder 2 and the half-PC girder 3 can be improved.

[0020]

[Effect of the device]

 As described above, according to the joint structure of the half-PC girder of the present invention, since the side wall of the half-PC girder is provided with the step part for mounting the end of the half-PC girder, the use of the gusset plate, The need to provide brackets can be eliminated and the half PC girder can be made into a simple shape. For this reason, the costs required for the metal fittings and the formwork of the half-PC girder can be reduced, and the appearance of the joint structure of the half-PC girder and the half-PC girder can be integrated with that of the girder and girder. The structure of the joint part can be used. Further, since the half-PC beam is installed on the step, the workability of connecting the half-PC beam can be improved. Since the stirrup streak extends in the direction orthogonal to the step, the mold can be removed from the stirrup extending direction.

The stirrup streak is arranged between the side wall of the half PC girder and the end of the half PC girder, and a concrete is provided between the side wall of the half PC girder and the end of the half PC girder. Since it was placed, the stirrup reinforcement can be fixed with this concrete, and the half PC girder and half PC girder can be connected. Therefore, the effect that the half-PC girder and the half-PC girder can be firmly joined can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a joint structure of a half-PC girder of the present invention.

FIG. 2 is a perspective view showing the half-PC girder of FIG.

FIG. 3 is a perspective view showing a connecting portion between a stirrup bar and a cap tie shown in FIG.

FIG. 4 is a partial cross-sectional view showing a mold of a half PC girder.

FIG. 5 is a perspective view showing a state after connecting the half-PC large beam and the half-PC small beam.

[Explanation of symbols]

 1 Half PC girder joint structure 2 Half PC girder 3 Half PC girder 4 Steps 5 Stirrup 6 Cap tie 7 Concrete

Claims (1)

[Scope of utility model registration request] 1. A half PC to which a half PC beam is connected.
In the structure of the connection part of the girder, the half-PC girder is provided with a step portion on the side wall thereof on which an end of the half-PC girder is placed along the longitudinal direction of the half-PC girder. A stirrup muscle extends in the orthogonal direction, and the stirrup muscle has an end coupled to a cap tie,
It is arranged between the side wall of the half-PC girder and the end of the half-PC girder, and concrete is cast between the side wall of the half-PC girder and the end of the half-PC girder. Half PC crossbeam structure.