JPS6168954A - Construction of outer wall using precast truss plate - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention provides a precast truss plate having a structure in which truss reinforcements are embedded in the back side of a precast concrete plate and a part of the reinforcement is exposed to the outside along the longitudinal direction. This relates to the construction method used for the outer wall.

(Prior Art) Conventionally, a precast truss plate 3 has a structure in which lath reinforcements 1 to 2 are buried in the back surface of a precast concrete plate 1 and a part thereof is exposed to the outside along the longitudinal direction, as shown in FIG. When constructing an outer wall using a truss plate, the bases of cap nut anchors 5 as shown in FIG. 1. Attach the base of the form tie 6 to the cap nut anchor 5. The inner formwork 4 is supported by the 7 langes 6A of the form ties 6 and the nuts 7, and in this state, cast-in-place concrete is poured into the gap 8 between the precast concrete 1-board 1 and the inner formwork 4. The exterior walls were being constructed.

(Problems to be Solved by the Invention) However, in this method of constructing an external wall, the bag nut anchors 5 must be buried in designated holes in the precast concrete plate 1 of the precast truss plate 3. There is a drawback that it requires a lot of work. Also,
Although it is necessary to provide an insertion hole for the form tie 6 in the inner formwork 4 in accordance with the position of the cap nut anchor 5 provided in advance,
In some cases, it may be impossible to provide the hole, and if there is a misalignment between the two, there is a drawback that the form tie 6 cannot be inserted.

The purpose of the present invention is to omit the need to bury a cap nut anchor in a precast concrete plate, to easily attach a form tie to a truss plate, and to easily align the form tie with a hole in an inner formwork. To provide a direction for constructing exterior walls using precast truss plates.

(Means of the present invention for solving problems) The present invention provides a precast truss plate having a structure in which truss reinforcements are embedded in the back surface of a precast concrete plate and a part thereof is exposed to the outside along the longitudinal direction. In the method of constructing an exterior wall using a precast truss plate, the precast truss plate is used as a frame, an inner formwork is arranged on the back side of the truss plate, and cast-in-place concrete is poured between the two to construct an outer wall. The present invention is characterized in that a plurality of form ties are erected on the exposed portions of the truss bars from the concrete plate via clamps, and the inner formwork is fixed with these form ties.

(Operation of the invention) When the form tie is erected on the exposed part of the truss bar using a clamp tool as described above, the form tie can be erected easily without using a bag nut anchor or the like which requires troublesome work. be able to. Further, depending on the work involved in attaching the form tie using a clamp tool, the attachment position can be arbitrarily selected, and the attachment position can also be easily changed. Therefore, alignment between the holes in the formwork and the form ties becomes easy.

(Example) Embodiments of the present invention will be described in detail below with reference to the drawings.

As shown in FIGS. 1 to 4, in the present invention, a cap nut anchor is not buried in the precast concrete plate 1 of the precast truss plate 3, but a truss bar 2 protruding from the back surface of the precast concrete plate 1 is buried. top 12
A form tie 6 is erected at A via a clamp tool 9.

The work of erecting the form ties 6 may be performed after the precast truss plate 3 has been erected at a predetermined position as shown in FIG. 2, or may be performed in advance on the ground. As the clamping tool 9, in this embodiment, a nut fitting 11 is arranged on the inner surface of the loop opening of a C-shaped clamping fitting 10.
A clamp bolt 12 in which the top reinforcement 2A of the truss reinforcement 2 that is in contact with the inner surface of the folded portion 10A of 0 is screwed into the nut fitting 11.
A structure is used in which the clamp member 10 is held together with the clamp fitting 10 by being held at the tip of the clamp member 10.

After the erection work of the truss plate 3 is completed, the inner formwork 4 is placed on the back side of the truss plate 3.
are placed through the spacer 13, the form tie 6 is passed through the hole of the intraocular form 4, and the inner form 4 is fixed with the flange 6A of the form tie 6 and the nut 7. Further, the inner formwork 4 is supported on the floor formwork 15 side by turnbuckles 14.

In this state, cast-in-place concrete is placed in the gap 8 between the precast concrete plate 1 and the inner formwork 4. After the cast-in-place concrete has hardened, turnbuckle 1
4 and the inner formwork 4 are removed.

FIG. 5 shows another example of the clamp tool 9. This clamp tool 9 has a structure in which a screw hole is directly provided in a C-shaped clamp metal fitting 10 and a clamp bolt 12 is screwed into the hole.

(Effects of the Invention) As explained above, in the method of constructing an exterior wall using precast truss plates according to the present invention, the work of erecting form ties is performed on exposed parts of truss bars using clamping tools, which requires troublesome work. Form ties can be easily erected without using a nut anchor or the like. In addition, according to the work involved in installing form ties using clamping tools, the installation position can be selected arbitrarily, and the installation position can be easily changed. This has the advantage that alignment can be easily performed.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of a precast truss plate provided with form ties according to the present invention, Fig. 2 is a cross-sectional view showing the process of constructing an outer wall groove according to the present invention, and Figs. 3 and 4 are A front view and a perspective view showing the relationship between the clamp fitting and the nut fitting used in this example, FIG. 5 is a perspective view showing another example of the clamp fitting, and FIG. 6 is a conventional precast truss. Fig. 7 is a cross-sectional view of a board with a form tie attached, and a perspective view of a conventional cap nut anchor, form tie, and nut in an exploded state. 1... Precast concrete plate, 2...
...Truss muscle, 2A...Top muscle, 3...
...Precast truss plate, 4...Inner formwork, 6...Form tie, 6A...7 Lange, 7...Nut, 8... ...Gap, 9
... Clamp fitting, 10... Clamp fitting, 11... Nut fitting, 12... Clamp bolt.

Claims (1)

[Claims] A precast truss plate with a structure in which truss bars are buried in the back of the precast concrete plate and a part of it is exposed to the outside along the longitudinal direction is used as the outer formwork, and the inner formwork is arranged on the back of the truss plate. In an external wall construction method using precast truss plates, in which an external wall is constructed by placing cast-in-place concrete between the two, each of the exposed portions of the truss reinforcements from the precast concrete plate is provided with a clamping tool. A method for constructing an exterior wall using precast truss boards, characterized in that a plurality of form ties are erected at the wall, and the inner formwork is fixed with these form ties.