JPS587787B2 - Precast concrete banno Setsugohouhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for joining three or more precast concrete plates in concrete prefabricated construction. Alternatively, there is a method in which the joint is completed by filling the closed space formed by the plates with concrete, without adding the joining work using spliced reinforcing bars, etc., which facilitates the work and achieves a joint that is functionally and aesthetically superior. is obtained.

Conventionally, when joining precast concrete plates, as shown in Figure 1, the reinforcing bars 2 and 2' protruding from the end faces of the plates are welded, spliced reinforcing bars, etc. are connected, and then concrete is applied to these parts. A method of filling and integrating them is being used.

However, this method requires a work space at that location, so the joint 3 is open, and the filled concrete portion is largely exposed on the side of the joint, which affects the workability, water resistance, and wall finish of the joint. It had many aesthetic defects.

Also, in the method of joining three or more precast concrete plates, according to the prior art, 8a and 8b
As shown in the figure, after connecting the reinforcing bars 3, 3' and 4, 4' protruding from the end surface of the plate by welding or splicing reinforcing bars, etc., these parts are filled with concrete and integrated. is being carried out.

However, since this method requires a working space at that location, the joint 5 is open, and the filled concrete portion is largely exposed on the side of the joint, resulting in functional problems such as workability, water resistance, and wall finish of the joint. , which had many aesthetic defects.

Furthermore, it is also known that a ring reinforcing bar is provided in advance at the joint end of the precast concrete plate to form a closed loop, and the joint is performed by the wedge action of the filling concrete in the closed loop (for example, Japanese Patent Application Laid-Open No. 49-9-9) 8
0 1 4), when a precast concrete plate is hung vertically during assembly, it is necessary to shift it horizontally so as not to collide with the annular reinforcement of the adjacent precast concrete plate, which causes problems in alignment with the lower precast concrete plate. there were.

An object of the present invention is to improve the above-mentioned drawbacks of the prior art, and to provide a joining method that is functionally and aesthetically superior in terms of workability, water resistance, and wall finish of the joint.

Before describing the embodiments of the present invention, for convenience of explanation, a case of two precast concrete plates will be described.

As shown in Figures 2a, b, and c, a recess 21 is formed at the joint end of the precast concrete plate 11, and a reinforcing bar 12 extending annularly from the bottom 22 of the recess is previously installed at the joint end of the precast concrete plate. It is being

The reinforcing bars 12 extend outward from the joint end surface 23.

Further, as is clear from the figure, the annular surface of the reinforcing bar 12 is parallel to the surface of the precast concrete plate.

Next, as shown in FIG. 3, two precast concrete plates are butted and arranged so that the reinforcing bars 12 and 12' overlap.

The mounting positions of the reinforcing bars 1 2 and 1 2' on the precast concrete plates 11 and 11' are as follows.
, 1 and 2' must be installed in a position so that they overlap.

Furthermore, these reinforcing bars 12 and 12' are not in contact with each other, and the precast concrete plates 11 and 11' are placed vertically in the drawing.
The reinforcing bars 12, 12' may be provided in such a position that they can be moved relative to each other, thereby facilitating the suspension of the concrete plate.

That is, it can be suspended in alignment with the precast concrete plate or foundation below.

The ring reinforcing bars 1 2 and 1 2' are the 6th reinforcing bars due to the overlapping relationship.
As shown in the figure, an annular closed loop is formed and the precast concrete plates 11, 11'' are firmly connected by the wedge action of the concrete poured into the interior 24 of this closed loop.

Next, each gray cast concrete plate 11, 11
The space 13 formed by the recess ' is filled with concrete as shown in FIG.

FIGS. 4 and 5 respectively show an example of a double row of annular reinforcing bars on one precast concrete plate and a double row of annular reinforcing bars on both precast concrete plates.

In this way, the number may be further increased depending on the thickness of the connection portion and the required connection strength.

According to this method, there is no need to perform reinforcing bar joining work by welding or other methods, so the joint space 13 for filling with concrete can be of a closed type, and both sides of the plate form joints with small gaps, and the concrete It does not require a formwork for filling, is easy to work with, and is advantageous in terms of water resistance and wall aesthetics.

Further, as shown in the figure, the connecting ring reinforcing bars 12, 12' protruding from the ends of the concrete plates 11, 11' are located in a plane parallel to the surface of the concrete plates, and are arranged offset from each other in the horizontal plane. concrete plate 11,
There is no hindrance to the hanging and movement of the board 11, and therefore the erection work of the board is easy.

Furthermore, after the concrete plates are erected and arranged, the connecting circular reinforcing bars face each other and overlap to form a closed shape between the vertical planes, so that the wedge action of the concrete filled here creates a strong joint. There is no need for joining the reinforcing bars together.

Examples of the present invention will be described below.

FIG. 9 shows an embodiment in which connections are made in a T-shape.

The arrangement of the two precast concrete plates in the water direction is the same as in the case of connecting the two concrete plates, so corresponding parts are indicated by the same reference numerals and the explanation will be omitted.

However, one of the joining end surfaces 23, 23 (the upper one in FIG. 9) is provided so that the distance therebetween is wide in order to connect the third precast concrete plate 31.

This upper end surface 23, 23' may be flush with the recess bottom 22 in the case of a T-shaped connection.

The connection method in this embodiment will be described below.

Precast concrete plate 1 1 as in the previous example
, 1 1', in this embodiment, the auxiliary loop reinforcing bars 15 are further set to cross the closed loop formed by the nub-like reinforcing bars 1 2 and 12'.

As shown in the figure, the negular planes of the reinforcing bars 1 2 and 1 2' are parallel to the end faces of the concrete plates 11 and 11'.

Further, the annular reinforcing bars 32 of the third precast concrete plate 31 having a connection end having a structure similar to that of the precast concrete plate 11 of the above embodiment are placed in an overlapping relationship with the loop bars 15, and a closed loop is formed between them. Set to .

In this embodiment, the case is shown in which there is one circular reinforcing bar 32 and two loop bars, but depending on conditions such as the required strength and the thickness of the precast concrete plate 31, the loop bars may be singular or plural. good.

Next, in the same manner as in the first embodiment, the space formed between the connecting ends of the three precast plates is filled with concrete to join them together.

10 to 12 show still another embodiment of the present invention, 4
This is an example in which two precast concrete plates are connected in a cross shape.

In this case, a configuration similar to that of the second embodiment is also adopted in the lower part of the drawing to form a cross shape.

The corresponding partial pressures have the same symbols as in FIG.

Precast concrete plate 11, 1 in this example
Similar to the second embodiment, a large gap is provided between the lower end surfaces 23, 23 of 1' for connection of the fourth precast concrete plate 41.

Loop reinforcement 15 third precast concrete plate 31
and the fourth precast concrete plate 41.

The structure of the connecting end of the fourth precast concrete plate may be the same as that of the third precast concrete plate.

Regarding the connection method, after setting three precast concrete plates as in the previous embodiment, setting a fourth precast concrete plate in the same manner as the third precast concrete plate, and then filling with concrete.

In a T-shaped or cross-shaped connection, a vertical reinforcing bar 50 may be provided in the center of the connection to reinforce the connection.

Although not shown in the drawing, this also applies to the connection of two concrete plates.

As described above, according to the present invention, there is no need to perform drinking reinforcement joining work by welding or other methods, so the joining space 36 for concrete filling can be of a closed type.
Both sides of the plate form joints with small gaps, forming formwork for filling with concrete. It is not necessary, the work is easy, and it is advantageous in terms of water resistance and wall appearance.

Furthermore, the joining ring reinforcing bars 12, 12'H protruding from the ends of one set of concrete plates 11, 11' are parallel to the concrete plate surface, and are also arranged offset from each other in the horizontal plane, so the concrete plates 11 and 11', even if there are adjacent concrete plates, there is no problem in suspending and moving them in alignment with the underlying foundation, etc., and therefore, the work of erecting the concrete plates is easy.

Next, the connecting annular reinforcing bars 32, 42 protruding from the ends of the second set of concrete plates 31, 41 are the annular reinforcing bars 12, which overlapped after the first set of concrete plates were erected. Separately installed circular reinforcing bar 15 through 12'. 15' (parallel to the end face of the concrete plate), and the second set of plates can be similarly suspended and moved without any trouble, making the erection work easy.

These joining ring reinforcing bars face each other in the vertical plane after the plates are arranged and overlap to form a closed shape.
The wedge action of the concrete filled here forms a strong joint, eliminating the need for joining reinforcing bars together.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a conventional technique for connecting two precast concrete plates; Figs. 2a, b, and C are side views showing the structure of the connecting end when two precast concrete plates are connected; They are a front view and a plan view. Fig. 3 is a side view showing the state of the connection in the case of the plan; Fig. 4 is a side view of another two-piece connection according to the present invention; Fig. 5 is a side view of still another two-piece connection according to the present invention; Figure 6 is a cross-sectional view taken along the line VI-Vl in Figure 3; Figure 7 is a cross-sectional view of
- Cross-sectional view along the line; Figure 8a is a side view showing a conventional technique in which three precast concrete plates are connected in a T-shape; Figure 8b is a conventional technique in which four precast concrete plates are connected in a cross shape. A side view showing the technique; Figure 9 is a side view showing the connection method according to the present invention when three precast concrete plates are connected in a T-shape; Figure 10 is a side view showing the connection method of the present invention in which three precast concrete plates are connected in a cross shape. A side view showing the connection method according to the present invention when
Cross-sectional view taken along the line XI-XI in the figure; Figure 12 is the ■-
■It is a cross-sectional view of the line. Explanation of symbols of main parts, 11, 11', 31, 41...
Precast concrete plate, 21, 214... Recess at connecting end, 22, 22'... Bottom of recess, 23, 23'
... End face of the connection end, 12, 12, 32, 42 ... Annular reinforcing bar, 15 ... Auxiliary loop reinforcing bar.

Claims (1)

[Scope of Claims] 1. In the method of connecting precast concrete plates, reinforcing bars extending outward from the end faces of the two precast concrete plates at the connecting ends of the two precast concrete plates are generally referred to as the plate surfaces of the precast concrete plates. The precast concrete plates are arranged in advance in an annular manner on parallel planes so that they shift and overlap with each other when they are connected, and the precast concrete plates are arranged with a gap between each end face, and the reinforcing steel A closed loop is formed on a plane substantially parallel to the plate surface of the precast concrete plate; an auxiliary annular reinforcing bar is placed in the closed loop so that its annular surface is substantially parallel to the end surface of the precast concrete plate; Crossing: At the connecting end of the third precast concrete plate, reinforcing bars extending outward from the end surface of the end are provided in advance in an annular shape on a plane substantially parallel to the plate surface of the third precast concrete plate. , the third precast plate is arranged in a direction substantially perpendicular to the two precast plates, so that a part of the auxiliary annular reinforcing bars and the annular reinforcing bars of the third precast concrete plate are shifted from each other and overlap, forming a closed loop. It doesn't seem to form;
Next, the space formed by the end portions of the three precast plates is filled with concrete, and the three precast concrete plates are connected in a T-shape. 2. In a method of connecting precast concrete plates: At the connecting ends of two precast concrete plates, reinforcing bars extending outward from the end faces of the ends are connected in a circular shape on a plane substantially parallel to the plate surfaces of the precast concrete plates. and, when the precast concrete plates are connected, the precast concrete plates are arranged in advance so that they shift and overlap with each other, and the precast concrete plates are arranged with a gap between their respective end faces, and the reinforcing bars are used to connect the gray cast concrete plates. A closed loop is formed on a plane substantially parallel to the plate surface; an auxiliary annular reinforcing bar is intersected by the closed loop so that its annular surface is substantially parallel to the end surface of the precast concrete plate; A reinforcing bar extending outward from the end surface of the connecting end of the precast concrete plate is provided in advance in an annular shape on a plane substantially parallel to the plate surface of the third precast concrete plate, and the third precast plate is arranged in a direction perpendicular to the two precast plates so that a part of the auxiliary annular reinforcing bars and the annular reinforcing bars of the third precast concrete plate are shifted from each other and overlap to form a closed loop;
Furthermore, reinforcing bars extending outward from the end surface of the opposite end at the connection end of the fourth precast concrete plate are provided in advance in an annular shape on a plane substantially parallel to the plate surface of the third precast concrete plate. A fourth precast plate is placed on the opposite side of the third precast plate, and the other part of the auxiliary annular reinforcing bars and the annular reinforcing bars of the fourth precast concrete plate are shifted and overlapped with each other to form a closed loop. There is nothing like that;
Next, the space formed by the end portions of the four precast plates is filled with concrete, and the four precast concrete plates are connected in a cross shape.