JP2832205B2 - Connection structure of precast concrete beam and precast concrete beam connection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention simplifies the production of precast concrete (hereinafter referred to as PC) girder and PC girder, and provides PC girder and PC girder.
The present invention relates to a joint structure between a PC girder and a PC girder, which can be easily joined to the girder, and in which the shear force between the PC girder and the PC girder is transmitted reliably.

[Problems to be solved by conventional technology and invention]

In recent years, in the construction of buildings, as a means of shortening the construction period and reducing the construction cost, a construction method in which large beams, small beams and the like are made into PCs has been often used.

However, if both the girder and the girder are made of PC, the lower streak of the girder cannot be fixed to the girder as in the conventional method without using a PC. Slightly retracted from the joint surface, pre-embedded in the PC beam and PC beam in this recessed space to protrude anchoring streaks, poured concrete in the space at the same time as the slab concrete was poured, and filled both PC beams and PC small beams. How to join the beams, or
A PC beam support is formed under the connection of the PC beam, and this
Various methods have been proposed, such as a method of mounting a PC girder and joining a PC girder and a PC girder without anchoring streaks.

However, the former joining method, in which both anchoring bars project from the connection surface of PC girders and PC girders, complicates the fabrication of PC girders and PC girders. The latter method of mounting the forehead has problems such as poor reliability in the transmission of the shearing force between the PC girders and the PC girder, and it is difficult to say that both methods are perfect bonding methods.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has been made to solve the problems.The production of the girder and the PC girder is simplified, and the connection between the PC girder and the PC girder is easy. In addition, the transmission of shear force between the PC beam and the PC beam is ensured.
It aims to provide a joint structure of the connection between PC girders and PC girder. .

[Means for solving the problem]

In order to solve the above-mentioned problem, the present invention forms a downward tapered surface at the fore end of a PC girder, and has an upward taper at the same inclination angle as the fore end taper surface of the PC girder at a connection portion of the PC girder. Surface, a bracket provided with a concave portion having a surface surrounding the left and right side surfaces and the bottom surface of the small beam edge is formed integrally with the large beam, and the small edge of the PC small beam is inserted into the concave portion of the bracket of the PC large beam, and the joint surface is formed. It is characterized by the joint structure of the connection between PC girders and PC girder whose gap is filled with expansion mortar.

[Action]

As described above, in the present invention, the PC girders and the PC girders are not made to protrude from the connection surface of the PC girders, so that the PC girders and the PC girders are simplified and can be easily manufactured. The assembling of the girder is as simple as inserting the gullet of the girder into the recess of the connection bracket of the PC girder, so that it is easy to assemble and disassemble. And the PC beam has its downward tapered surface
By contacting the upwardly tapered surface of the bracket at the connection of the PC girder, the shearing force applied to the PC girder is transmitted to the PC girder through the entire area of the girder of the girder due to the tapering effect of the tapered surface. Even if there is no anchoring streak between the small beams, a sufficiently reliable joining force can be obtained.

〔Example〕

 Hereinafter, the present invention will be described in detail based on the illustrated embodiment.

FIG. 1 is an exploded perspective view of a connection between a PC girder and a PC girder according to the present invention, and FIG. 2 is a longitudinal sectional view of a joined state.

In the figure, 1 is a PC girder, 2 is a PC girder to be joined to the PC girder 1, and 3 is a bracket formed integrally with the PC girder 1 at a connection portion of the PC girder 1. A downward tapered surface 2a is formed, and the bracket 3 of the PC girder 1 is
Upward tapered surface 4a facing the downward tapered surface 2a of the edge of the PC beam 2 at the same inclination angle, and the left and right side surfaces of the edge of the beam 2
There is provided a recess 4 in which surfaces 4b, 4b, 4c surrounding the bottom surface 2b and the bottom surface 2c are formed.

The outer shape of the bracket 3 may be a trapezoid having one side vertical in side view as shown in FIGS. 1 and 2, or a modified triangle in which the lower part of the hypotenuse of a right-angled triangle is cut vertically as shown in FIG.
Also, as shown in FIG. 4, a vertically long rectangle in a side view is optional.

As shown in FIG. 2, the PC beam 1 and the PC beam 2 are assembled by inserting the edge of the beam 2 into the recess 4 of the bracket 3 of the beam 1, as shown in FIG. Align the top of PC beam 1 To align PC beam 2 and PC beam 1
A level adjusting mortar 5 is mounted in a gap between the bottom surface 2c of the small beam 2 and the bottom surface 4c of the concave portion 4. Also, the upward tapered surface 4a of the bracket 4 and the downward tapered surface 2a of the PC beam 2 small opening
Is filled with an expanded mortar 6. After this, cast-in-place concrete 8 is attached to the slab formwork 7 assembled.
To build a slab.

〔The invention's effect〕

As described above, according to the present invention, a downward tapered surface is formed at the fore end of a PC girder, and a connection portion of the PC girder has an upwardly tapered surface that faces the fore end taper surface of the PC girder at the same inclination angle. And a bracket provided with a concave portion having a surface surrounding the left and right side surfaces and the bottom surface of the small beam edge is formed integrally with the large beam, and the small edge of the PC small beam is inserted into the concave portion of the bracket of the PC large beam, and a gap between the joint surfaces is formed. And filling with expanded mortar
The joint structure of the connection between PC beam and PC beam, PC beam and PC beam
Since both anchors do not protrude from the connection surface of the small beam,
The PC girder is simplified and easy to manufacture, and the assembly of the PC girder and the PC girder is as simple as inserting the girder of the girder into the recess of the connection bracket of the PC girder. It is easy to dismantle. And the PC beam has its downward tapered surface in contact with the upward tapered surface of the bracket at the connection of the PC beam, so that the shearing force acting on the PC beam is reduced to the entire cross-section of the beam by the tapered surface To the PC girder through the bridge, which provides a sufficiently reliable joining force without the anchoring between the PC girder and the PC girder, and the recess of the bracket changes according to the PC girder Even if not done, the bottom 2c of the PC beam 2 and the bottom of the recess 4
The level adjustment can be performed by a level adjustment mortar that is provided in the gap between the mortar 4c, and the like.

[Brief description of the drawings]

The drawings show an embodiment of the present invention, and FIG.
FIG. 2 is an exploded perspective view of a connection between a PC girder and a PC girder, FIG. 2 is a longitudinal sectional view of a joined state, and FIGS. 3 and 4 are side views of embodiments of brackets having different shapes. 1 ... precast concrete beam, 2 ... precast concrete beam, 2a ... downward tapered surface of precast concrete beam, 3 ... bracket, 4 ...
Concave part of bracket, 4a ... upward tapered surface of bracket, 5 ... level adjustment mortar, 6 ... expansion mortar.

Claims (1)

(57) [Claims] 1. A precast concrete beam having a downward tapered surface at its forehead, and a connection portion of the precast concrete girder having an upwardly tapered surface facing the small taper surface of the precast concrete beam at the same inclination angle. , Forming a bracket integrally provided with a concave portion having a surface surrounding the left and right side surfaces and the bottom surface of the small beam edge,
A joint structure between a precast concrete girder and a precast concrete girder, wherein the precast concrete girder is inserted into a recess of a bracket of the precast concrete girder, and a gap between joint surfaces is filled with expansion mortar.