JPH0637801B2 - Architectural concrete member and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION “Industrial field of application” The present invention relates to a concrete member for construction (for example, a concrete plate, a concrete beam, etc.) that contains a reinforcing linear body such as a long fiber therein, and the production thereof. It is about the method.

“Prior Art” Conventionally, as this type of concrete member, there is a so-called fiber cement board. This is a concrete or mortar in which a fiber such as carbon fiber or steel fiber having a length of about 20 to 30 mm is kneaded and molded into a plate shape, or the fiber is directly sprayed onto the surface of a concrete plate before hardening. It is a thing. Since these are high-strength concrete materials having higher tensile strength than simple concrete plates, they have been widely used in recent years for precast members and members that receive a large tensile force.

"Problems to be solved by the invention" By the way, the tensile strength of such a concrete member is
Depending on the length and direction of the fibers in the concrete, the more the fibers are aligned in the direction in which tensile force is applied, the more
The longer the fiber length, the higher the fiber length. However,
In the conventional concrete member (fiber cement board),
Since the fibers are mixed in the mortar in an arbitrary direction, there are many structurally useless fibers, and the length of the fibers that can be used is limited because of the kneading or direct spraying method. was there.

On the other hand, as a concrete member that solves such a difficulty, it is considered that a large number of long steel wires or the like are embedded inside along the entire length in the width direction or the longitudinal direction.
However, in such a concrete member, the work of stretching a large number of steel wires one by one becomes extremely complicated during manufacturing.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a novel concrete member that has high tensile strength and the like and is easy to manufacture, and a manufacturing method thereof. .

[Means for Solving Problems] In order to achieve such an object, the concrete member of the present invention is a concrete or mortar, and a linear member such as long fibers or steel wire is hooked on a guide tool and folded back to meander. It is embedded in a state and a plurality of linear portions of the linear body are aligned and extended in a predetermined direction.

Further, the manufacturing method of the present invention, a plurality of guide tools are attached to the inner surface of the concrete forming mold, and the linear members for reinforcement are hooked on these guide tools and folded back while being stretched in the mold. After that, it is a method of placing concrete or mortar in the formwork.

[Operation] According to the concrete member of the present invention, a plurality of linear portions directed in a predetermined direction efficiently enhance the tensile strength in the direction, and these linear portions guide a long linear body. It can be efficiently formed at once by hooking it on and folding it back.

Further, according to the manufacturing method of the present invention, by hooking the long linear body on the guide and folding it back, a desired amount of the linear body can be obtained in a desired position at a desired position, and a uniform tension force can be applied. It can be easily stretched in the condition that it is applied.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 shows a concrete member (concrete plate in this embodiment) according to the present invention, and reference numeral 1 in the drawing is a plate-like body obtained by hardening concrete or mortar. In the vicinity of the peripheral edge of the plate-shaped body 1, a guide tool 2 such as a pulley is provided with a second guide.
As shown in the drawing, a plurality of upper and lower two pieces are embedded along the peripheral edge of the plate-like body 1, and these guide tools 2 are used as fixing jigs in the vicinity of the upper surface and the lower surface inside the plate-like body 1 for reinforcing lines. The body 3 is stretched vertically and horizontally. That is, the linear body 3
Is a plurality of linear portions 4 extending in the vertical direction (vertical direction in FIG. 1) and a plurality of linear portions extending in the lateral direction (horizontal direction in FIG. 1) between the guide tools 2 arranged on the edges facing each other. Straight part 5
And a plurality of folded-back portions 6 that half-circulate the outer circumference of each guide tool 2 and continuously connect all the linear portions 4 and 5. Further, in other words, in this embodiment, two grids formed by bending just one line are vertically embedded in parallel. However, the linear body 3
Is formed by aligning or twisting a plurality of long fibers (for example, carbon fibers or glass fibers in the form of filament yarn) or fine steel wires.

In the concrete member thus configured, the plurality of straight line portions 4 and 5 extending in the vertical direction and the horizontal direction efficiently increase the tensile strength in that direction without waste. Moreover, these straight portions can be efficiently formed at once by folding back the long linear body 3.

Next, a method for manufacturing the concrete member will be described in the order of steps.

(I) As shown in FIG. 3, a square saucer-shaped mold 7 for molding a concrete plate is prepared, and the guide 2 is provided on the inner surface of the side wall of the mold 7 as shown in FIG. Removably attached.

(Ii) After fixing one end of the long linear body 3 to the form 7, the linear body 3 is guided to each guide tool (lower guide tool of the upper and lower two guide tools) as shown in FIG. 2 is hooked in the order of 2 (a), 2 (b), 2 (c) ... and folded back, and stretched between the guide tools 2 facing each other vertically in FIG. Then, when the linear body 3 reaches the guide tool 2 (d), a line between the guide tools 2 facing left and right in FIG. 5 is shown as 2 (e), 2 (f), 2 (g) ... The linear body 3 is stretched, and finally the tip (the other end) of the linear body 3 is pulled out of the form frame 7 as shown by the chain line in FIG. Tension over the entire length.

(iii) The same operation as (ii) above is performed on the upper guide tool 2.

(iv) Concrete or mortar is poured into the mold 7 and hardened.

(V) After removing the load and removing one end of the linear body 3 and all the guide tools 2 from the mold 7, the mold 7 is removed.

As described above, according to the present manufacturing method, by using the guide tool 2 attached to the inner surface of the mold 7, the plurality of straight line portions 4 and 5 are extremely easily and tightly tensioned. It is possible to pass. Moreover, it is possible to freely set the stretching direction, the stretching position, the stretching amount, and the like of the linear body 3.

In the above embodiment, the upper and lower guide members 2 are used, but the upper and lower two linear members 3 may be hooked on one guide member. Further, in the embodiment, two linear bodies 3 are stretched around the upper surface and the lower surface of the plate body 1, but one or three or more linear bodies may be provided. Further, the guide tool 2 is not limited to the pulley, and may be, for example, a hook-shaped hanging metal fitting. Further, the stretching direction of the linear body 3 is not limited to vertical and horizontal directions, but may be oblique, and the stretching state may be partial rather than total. Furthermore, although concrete plates have been described in the examples, the present invention can also be applied to concrete beams, concrete columns and the like.

"Effects of the Invention" As described above, the concrete member of the present invention has a plurality of straight line portions of a linear body in which a linear body such as a long fiber or a steel wire is embedded in a meandering state inside concrete or mortar. Since they are aligned in a predetermined direction and extended, the following effects are obtained.

Since a plurality of guides are provided along the peripheral edge of the concrete member, tension can be easily applied to one linear body by applying a load to one end of the linear body, and the linear portion The tensile strength in the extending direction can be efficiently increased without waste, and the pre-stressing pre-stress can be uniformly introduced into all straight portions. As a result, the quality of the concrete member can be made excellent. Moreover, since it is buried in a meandering state, it is extremely difficult to come out. That is, since it is tough and the linear body can be effectively used, it is highly economical.

Since the plurality of straight portions can be easily formed by hooking the guide member and bending a single linear body, the manufacturing operation is easy.

Further, the manufacturing method of the present invention, a plurality of guide tools are attached to the inner surface of the concrete forming mold, and the linear members for reinforcement are hooked on these guide tools and folded back while being stretched in the mold. After that, since concrete or mortar was placed in the formwork, the following effects can be obtained.

A desired amount of linear bodies can be stretched in a desired direction at a desired position of a concrete member.

Therefore, the linear member can be used very effectively to obtain a highly economical concrete member.

If appropriate tension is applied to the linear body, the tensile strength, cracking strength, etc. can be further improved, and this tension can be applied to multiple straight lines by applying a load to one end of the linear body. The parts can be applied simultaneously and uniformly. That is, a concrete member with excellent quality can be efficiently obtained.

[Brief description of drawings]

1 to 5 show an embodiment of the present invention, FIG. 1 is a schematic plan sectional view of concrete, and FIG. 2 is II-II of FIG.
Fig. 3 is a plan view showing a state in which a guide tool is attached to the mold, Fig. 4 is a view taken along the line IV-IV in Fig. 3, and Fig. 5 is a plan view for explaining the manufacturing method. Is. 1 ... plate-like body, 2 ... guide tool, 3 ... linear body, 4,5 ...
… Straight line part, 6 …… Folded part, 7 …… Form frame.

Claims (2)

[Claims] 1. In a concrete member for construction made by molding concrete or mortar, a reinforcing linear body is embedded in the concrete or mortar, and the linear body is composed of a plurality of linear bodies extending in a predetermined direction. A concrete member for construction characterized by having a straight line portion and a folded back portion which is hooked and folded back on a plurality of guide tools arranged on the inner peripheral edge portion of the concrete member, and which is a continuous folded back portion of these straight lined portions. . 2. A plurality of guides are attached to the inner surface of a concrete forming frame, and then a reinforcing linear member is hooked on the guides and folded and stretched in the form, after which the form is formed. A method for producing a concrete member for construction, which comprises producing concrete member by placing concrete or mortar in a frame.