JP2651503B2 - Joining method of half precast concrete beam and half precast concrete beam - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a half-precast concrete girder and a half-precast girder which can easily join a half-precast girder and a small girder with each other and can obtain a reliable anchoring force. And a method for joining the same.

[Problems to be solved by conventional technology and invention]

In recent years, in construction of buildings, as a means to save labor and improve workability, large beams and small beams are converted to half precast concrete (hereinafter referred to as half PC),
A method of combining a half PC slab with this has been increasingly adopted.

Therefore, when both the girder and the girder are made into half PC,
When connecting the PC girder and the girder, the lower strut of the girder does not receive the tensile force.Therefore, a small girder seat is formed at the bottom of the girder. There has been proposed a joining method of joining a girder and a girder without placing the lower streak of the girder by placing the upper half concrete of the girder and the half PC girder. However, according to the current structural regulations, it is required to fix the lower streak of the girder. Therefore, in order to fix the lower streak of the girder, it is necessary to protrude the extra length of the lower streak from the small mouth of the half PC small beam. In order to hit the beam on the steel beam of the reinforcement or the SRC structure, the lower strut is bent or constructed.In the case of the half PC girders, the extra length of the lower strut of the small beam is fixed to the half PC girders. It was impossible.

[Problems to be solved by the present invention]

In view of the above situation, the present invention has been conceived with an object to establish a method of joining a half-PC large beam and a half-PC small beam, in which a half-PC large beam and a small beam can be easily joined to each other and a secure fixation can be obtained. Things.

[Means for solving the problem]

In order to solve the above problems, the present invention is to project and embed the curved portion of the U-shaped anchor streaks in advance on both joint surfaces of the half PC girders and half PC girders, The joint surfaces are set to face each other, and dowels are inserted into loops formed by the protruding curved portions of the U-shaped anchoring bars. Thereafter, the upper half concrete of the girder, the upper half concrete of the girder, and the slab Concrete is casted in one piece, and half PC girders and half PCs are used to embed the protrusions of the anchoring streaks in concrete.
It features a method of joining with PC beams.

(Operation)

Since the U-shaped anchoring bars are embedded at the same time when the half-PC girders and half-PC small beams are produced at the factory, productivity is good, and the anchoring of the half-PC girders and half-PC small beams is performed by joining the joint surfaces of both beams. Simply buttocks, insert dowels into the loop formed by the two protruding curved parts that protrude from both joint surfaces, and insert this into the upper half concrete of the girder, the upper half concrete of the girder, and the slab concrete. Since it is embedded at the same time, half PC without any extra length of anchoring protrusion of lower streaks of small beams
Anchoring of the girder and the half PC beam becomes possible, the construction is easy, and both beams are anchored by the plug effect of both U-shaped anchoring bars and dowel bars, so that a secure anchoring force can be obtained.

〔Example〕

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

FIG. 1 is a longitudinal sectional view in the direction of a small beam at a joint between a half PC large beam and a half PC small beam constructed by the method of the present invention;
FIG. 2 is a horizontal cross-sectional view of the joint, and FIG. 3 is a side view of a half PC beam.

In the figure, 1 is a girder, and a lower half PC girder 2
And an upper half girder 3 cast with cast-in-place concrete in the upper half, and an upper bar 4, a lower bar 5, a stirrup 6, and a reinforcing bar 7 are arranged inside.

Numeral 8 denotes a small beam joined to the large beam 1, which is formed by a lower half half PC beam 9 and an upper half upper beam 10 cast by cast-in-place concrete. Streak 11, lower muscle 1
2. Stirrups 13 are arranged.

The joint between the girder 1 and the girder 8 is formed with a concave-shaped receiving portion 2a which receives the edge of the half-PC girder 9 at the junction of the half-PC girder 2 and the joint of the half-PC girder 9 An inclined surface 9a is formed by retreating the upper surface of the small beam 9. And half PC beam 2
U-shaped anchoring bars 14 and 15 are embedded in the receiving wall surface and the small slope 9a of the half PC beam 9 by respectively projecting the curved portions 14a and 15a appropriately from the slope 9a and the receiving wall surface. 1
A U-shaped dowel 17 shown in FIG. 4 is inserted into a loop portion 16 formed by the four curved portions 14a and 15a.
The projecting curved portions 14a and 15a of 14 and 15 are buried when the upper half concrete of the girder, the upper half concrete of the girder and the slab concrete are cast in place.

The method of joining the half PC girders and half PC girder constructed as described above is as follows. First, at the factory, the lower half of the girder rebar consisting of the upper strut 4, lower strut 5, stirrup 6, and reinforcement 7 The half P embedded with the curved portion 14a of the U-shaped fixing streak 14 protruding from the wall surface of the receiving portion 2a at the junction with the half PC beam 9 as appropriate.
The C beam 2 is manufactured. Also, while embedding the lower half of the beam rebar consisting of the upper streaks 11, the lower streaks 12, and the stirrups 13,
A half PC beam 8 is manufactured in which the curved portion 15a of the U-shaped fixing stud 15 is appropriately projected and embedded in the small slope 9a at the joint portion with the PC beam 2.

The half-PC girder 2 and the half-PC girder 8 are carried into the site, the half-PC girder 2 is supported by the support, and the fore-edge joint of the half-PC girder 9 having the slope 9a formed in the receiving part 2a of the juncture. Hang the lower edge. In this state, an open wedge-shaped space 18 is provided between the joints of the half PC girders 2 and the half PC girders 9.
The curved portions 14a and 15a of the U-shaped fixing bars 14 and 15 of the large beam 2 and the small beam 8 project into the space 18 by forming a loop with each other. Therefore, if a U-shaped dowel 17 is inserted into the loop portion 16 and then the upper half concrete of the girder, the upper half concrete of the girder, and the slab concrete are integrally cast, concrete is also formed in the wedge-shaped space 18. Filled and half
The PC girder and the half PC girder 9 are securely joined and fixed.

〔The invention's effect〕

As described above, the present invention relates to a half PC beam and a half beam.
The curved portions of the U-shaped anchoring bars are projected and embedded in both joint surfaces of the PC beams in advance, and the half-PC girders and half-PC beams are installed with the joint surfaces facing each other. Insert dowels into the loops formed by the projecting curved portions, and then cast the upper half concrete of the girders, the upper half of the small beams, and the slab concrete together. Embedded in concrete half PC girders and half
It is to join a PC beam, wherein the U-shaped anchor streaks,
The factory production of the half-PC girders and half-PC small beams is embedded at the same time, so productivity is good, and the fixing of the half-PC girders and half-PC small beams is achieved by simply joining the joint surfaces of the two beams, A dowel is inserted into the loop formed by the two projecting curved sections, and this is buried at the same time as the upper half concrete, the upper half concrete and the slab concrete of the girder. It is possible to fix the half PC large beam and the half PC small beam without the extra length of the protrusion of the lower strut, the construction is easy, and both beams are
The two U-shaped anchoring muscles and the dowel muscle are fixed by the plug effect, and a secure anchoring force is obtained.

Also, when the beam designed by the conventional construction method using cast-in-place concrete is formed into a half PC, the method according to the present invention has effects such as easiness.

[Brief description of the drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view in the direction of a small beam at a joint between a half-PC large beam and a half-PC small beam constructed by the method of the present invention, and FIG. Fig. 3 is a side view of a half PC girder, and Fig. 4 is a front view of a dowel streak. 1 girder, 2 girder, half precast concrete girder, 8 girder, 9 girder half precast girder, 14,1
5: U-shaped anchoring muscle, 14a, 15a: Curved portion of U-shaped anchoring muscle, 16
... loop part, 17 ... dowel streaks.

Claims (1)

(57) [Claims] (1) The joint surfaces of the half precast concrete girder and the half precast concrete girder are preliminarily provided with U
The semi-precast concrete girder and the half-precast concrete girder are placed with the joint surfaces facing each other, and the curved portions of the U-type anchoring streaks are formed between the projecting curved portions of the U-shaped anchoring streaks. The dowel is inserted in the loop part, and then the upper half concrete of the girder, the upper half concrete of the girder, and the slab concrete are integrally cast, and the protrusion of the anchoring streaks is embedded in the concrete. To join half precast concrete girder and half precast concrete girder.