JPS5810540B2 - How to join precast concrete plates - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for joining precast concrete plates in concrete prefabricated construction,
The method of arranging the joining reinforcing bars in a three-dimensional manner without adding welding or splicing reinforcing bars to the joining reinforcing bars embedded in the plate makes the work easier, economically advantageous, and has improved performance. This provides excellent precast concrete board joints.

Conventionally, when joining precast plates, as shown in Fig. 1, reinforcing bars 3 and 3 are attached to the protruding reinforcing bars 2 and 2' on the end faces of the plates (precast concrete plates 1 and 1').
The method used is to perform welding work using a metal pipe to connect the parts, and then fill the parts with concrete to unite them.

However, since this method involves welding work on site, it is economically disadvantageous because it requires advanced technology.Also, since it involves welding within a narrow space formed by the plate end faces, it is difficult to work, and as a result, It also had many flaws in terms of functionality.

In addition, as another method of the prior art, as shown in Fig. 2, a plate (
Vertical reinforcing bars 4, 4' are placed in a closed loop formed by superimposing a part of the auxiliary annular reinforcing bars 13 on the annular reinforcing bars 12, 12', etc. protruding from the end face of the precast concrete plate 1.1'). There is also a method in which the spaces formed by the end surfaces of the plates are filled with concrete to integrate them.

However, this method is economically disadvantageous because a large number of vertical reinforcing bars are inserted into the closed loop, and the space formed by the end face of the plate has circular reinforcing bars for joining protruding from four sides in the horizontal plane. As a result, the substantial space in the horizontal section becomes narrow, making it difficult to pour concrete filler from above and ensure it reaches the bottom, which tends to cause defects in the performance of the joint.

The present invention improves the shortcomings of the conventional method of connecting precast concrete plates, and provides a joining method that is superior in terms of workability, economy, and performance of the joint, and will be described in detail with reference to the drawings below.

FIG. 3a is a plan view of an embodiment of the present invention, FIG. 3A is a sectional view taken along line bb' of FIG. 3A, and FIG.
Fig. 2 is a cross-sectional view taken along line c-c' of Fig. 1, in which reinforcing bars 22 and 22' extending annularly in the vertical plane are provided in advance at the joint of the end faces of the opposing precast concrete plates 1 and 1'.

When the reinforcing bars 22 and 22' are precast (precast) plates 1 and 1' are placed facing each other in a predetermined position, they are at mutually shifted positions as shown in Figure 3a in terms of planes, and as shown in Figure 3 in elevation. They polymerize together to form a closed loop.

Furthermore, a reinforcing bar 12° 12' extending annularly in a horizontal plane is provided in advance at the joint portion of the end face of the precast plates 11, 11c which are connected perpendicularly to the precast plates 1, 1'.

Next, the auxiliary annular reinforcing bar 23 passes through the vertical inner closed loop formed by the protruding reinforcing bars 22 and 22' of the precast plates 1 and 1', and perpendicularly crosses the protruding reinforcing bars 12 and 12' of the precast plates 11 and 11'. A part of the precast plates 1, 1' and 11.11' overlaps in the horizontal plane to form closed loops, and after passing vertical reinforcing bars 4.4' through these closed loops, the end faces of the precast plates 1, 1' and 11.11' The created space is filled with concrete and connected by the strong cantilevering action of the reinforcing bars and concrete.

According to the present invention, there is no need to perform welding work or other reinforcing bar joining work on site, so the work is easy and economical.
．． 22', the auxiliary annular reinforcing bar 23 penetrates in a bar shape, and the protruding reinforcing bars 12 and 12' of the precast plate 11°11'
Vertical reinforcing bars 4, 4' are inserted in a bar-like manner to form a strong joint.

Furthermore, the protruding reinforcing bars 22, 22' overlap in the vertical plane, and the protruding reinforcing bars 12, 12' overlap in the horizontal plane, resulting in a three-dimensional arrangement, which creates a space in the horizontal section for filling with concrete poured from above. It has a relatively large amount of margin, improves workability, and fills with defect-free, dense concrete.The number of reinforcing bars inserted in the vertical direction is also reduced compared to conventional technology, and it is superior in terms of performance and economy. Construct a joint.

FIG. 4 is a plan view of another embodiment of the present invention, in which three precast boards are connected in a single shape.

In FIG. 4, reinforcing bars 22 extending annularly in a vertical plane are provided in advance on the end face of one precast board 1, and two precast boards 21 are disposed opposite to the precast board 1 in the perpendicular and angular directions. At the joint of the end face of .21', there is a reinforcing bar 12.12 that extends annularly in the horizontal plane.
' is set in advance.

Next, the auxiliary annular reinforcing bar 23 passes through the closed loop in the vertical plane of the protruding annular reinforcing bar 22 of the precast plate 1, and partially overlaps with the protruding reinforcing bar 12° 12' of the precast plate 2L21' in the horizontal plane, so that each After forming closed loops and passing vertical reinforcing bars 4, 4' through these closed loops, the space formed by the end faces of precast plates 1 and 21, 21' is filled with concrete.

As explained above, the method for joining precast concrete plates of the present invention eliminates the need to perform reinforcing bar joining work by welding or other methods, and uses the three-dimensional arrangement of annular reinforcing bars in horizontal and vertical planes to connect orthogonal walls. A strong cantilevering effect can be achieved with a small number of reinforcing bars for all of the plates, and the concrete filling performance is also improved, which has the advantage of being economically advantageous and having excellent performance.

[Brief explanation of the drawing]

Figures 1 and 2 are explanatory diagrams of a conventional connection method for connecting four precast concrete plates, and Figure 3a is an embodiment of the present invention, illustrating a method for connecting four precast concrete plates in a medium letter shape. Figure 3 is a cross-sectional view taken along line bb' of Figure 3a, and Figure 3C is a cross-sectional view taken along line bb' of Figure 3a.
FIG. 4 is an explanatory diagram of a method for connecting three precast concrete plates in a T-shape according to another embodiment of the present invention. 1.1', 11.11', 21.21'... Precast concrete plate, 12.12'... Protruding circular reinforcing bars (in the horizontal plane), 22.22'... Protruding circular reinforcing bars (in the vertical plane) )
, 13, 23...Auxiliary annular reinforcing bar, 4.4'...Vertical penetrating reinforcing bar.

Claims (1)

[Claims] 1. In a method of joining precast concrete plates, the reinforcing bars extending outward from the end faces of two opposing precast plates are arranged in a circular shape in a vertical plane, and overlapped with each other so that they are offset from each other when the precast plates are connected. The precast plates are placed so as to protrude in advance, and the precast plates are placed opposite each other so that the protruding reinforcing bars form a closed loop in a vertical plane.The auxiliary annular reinforcing bars are passed through this closed loop, and the precast plates are placed at right angles to the two precast plates. The reinforcing bars extending outward from the end faces of the other third or third and fourth precast plates to be connected in the direction are arranged annularly in the horizontal plane and part of the auxiliary annular reinforcing bars and the third or fourth precast plates. The protruding annular reinforcing bars of the third and fourth precast plates are positioned so that they overlap each other and form a closed loop in the horizontal plane.By inserting vertical reinforcing bars into this closed loop, the orthogonal precast plates are joined. A method for joining precast boards, characterized in that bolts are formed in both directions of the precast boards, and then the spaces formed by the end faces of the three or four precast boards are filled with concrete and connected.