JPH0617509A - Reinforced truss and semi-pc plate therewith - Google Patents

Abstract

PURPOSE:To make assembling operation easier. CONSTITUTION:Eacb loop 3 is formed of a reinforcing bar in an endless riong form, consisting of two parallel bars and a circular arced part to connect the ends of bath the bars, In the loop 3, the length of each bar is equalized to the distance between main beams 1 and 2 when assembling the truss, and three loops 3 as one set are formed. so that the three loops 3 of each set constitute each side of one triangle. Two main bars 1 and 2 are inserted into each loop 3, the main bar 1 to be the upper chord member is lifted up, and the loops 3 are combined together for each set to construct a reinforced truss T.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a reinforcing bar truss, and a half PC plate in which the reinforcing bar truss is reinforced and a lower chord main bar is embedded in concrete.

[0002]

2. Description of the Related Art As a reinforcing bar truss to be embedded in a half-PC board as a reinforcing material, for example, Omnia reinforcing bar and Kaiser truss reinforcing bar are well known. However, these reinforcing bar trusses have many connecting points between the reinforcing bars. Yes, it takes time to assemble because all of them are welded. Conventional half P that dealt with this
Examples of the C plate and the reinforcing bar trusses arranged therein are, for example, JP-A-61-126254 and JP-A-63.
There is one described in Japanese Patent Laid-Open No. 125760.

The structure of a reinforcing bar truss disclosed in Japanese Patent Laid-Open No. 61-126254 has a rib structure that surrounds the entire main bar consisting of the upper main chord and the lower main chord of the upper and lower chords, which are opposed to each other in parallel with each other at a predetermined interval. A half-PC board is constructed by winding a reinforcing bar so that the longitudinal cross-section has a triangular or rectangular shape, and arranging the reinforcing bar truss so that the lower chord main reinforcing bar is embedded in concrete.

Further, in the structure of the reinforcing bar truss disclosed in Japanese Patent Laid-Open No. 63-125760, one upper chord main bar and two lower chord main bars are arranged in parallel with each other with a predetermined interval. The upper chord main bar and each lower chord main bar are connected and fixed by a plurality of strip-shaped metal plates at plural positions in the longitudinal direction to form a triangular cross section, and the lower chord main bar of the reinforcing bar truss is embedded in concrete. The half-PC board is constructed by arranging as follows.

The connection between the respective main bars and the strip-shaped metal plate is carried out by wrapping the main bars at the ends of the strip-shaped metal plates and sandwiching them, and crimping them with a hydraulic tool for sleeve crimping at the main joint. In general, the reinforcing bar truss is assembled in a factory and transported to the site.

[0006]

However, in the above-mentioned reinforcing bar truss and the half PC board using the reinforcing bar truss, the reinforcing bar truss described in JP-A-61-126254 was assembled at the factory. When the reinforcing bar truss is transported to the site by a truck or the like, there is a problem that the reinforcing bar truss is bulky and is surrounded by ribs so that the reinforcing bar truss easily loses its shape.

Further, in the reinforcing bar truss described in Japanese Patent Laid-Open No. 63-125760, the upper and lower main bars are connected and fixed by the band-shaped metal plates, so that the shape is hard to lose, but the main bars are connected and fixed. In order to do so, it is necessary to process and manufacture a special strip-shaped metal plate, and it is troublesome because it is assembled by crimping with a hydraulic tool for sleeve crimping.

The present invention has been made in view of the above problems, and an object thereof is a rebar truss which can be easily assembled and a half PC plate using the truss.

[0009]

In order to achieve the above object, the reinforcing bar truss of the present invention has an upper chord main bar and a lower chord main bar,
A plurality of loop reinforcements formed in an endless annular shape are stretched between two adjacent main reinforcements of the plurality of main reinforcements, which are arranged in parallel with each other at predetermined intervals, and have a longitudinal sectional shape. It is characterized by being assembled into a triangle or a rectangle.

A plurality of the reinforcing bar trusses are arranged at a predetermined interval in a direction orthogonal to the longitudinal direction of the reinforcing bar truss, and auxiliary bars whose axes are oriented in the arrangement direction of the reinforcing bar truss group are arranged in the longitudinal direction of the reinforcing bar truss. It is advisable to construct a half-PC board by arranging a plurality of bars along the line and placing concrete so that the lower chord main bars and auxiliary bars of the above-mentioned reinforcing bar truss are embedded in the concrete.

[0011]

In the reinforcing bar truss of the present invention, the corresponding two main reinforcements are passed through the respective loop reinforcements so that the loop reinforcements are laid between the two main reinforcements. It is easy to put on and take off the loop muscles, and when transporting from the factory to the site, the main muscles and the loop muscles are carried separately, so there is no bulkiness or loss of shape during transportation, and the upper main string and the lower main string It is possible to construct a reinforcing bar truss having a triangular or rectangular vertical cross section simply by suspending a plurality of loop reinforcing bars in sequence between the upper and lower chord main bars and between the lower chord main bars, and then hoisting the upper chord main bars.

Further, even if loop bars are attached between the main bars at the factory, they can be placed on a truck or the like in a state of being developed in a plane, so that they are bulky or lose their shape when transported to the site. There is nothing to do. Also in this case, the reinforcing bar truss can be easily assembled on the spot simply by lifting the upper main string. Then, a plurality of the assembled reinforcing bar trusses are arranged in a form, and auxiliary bars are arranged so as to connect the reinforcing bar trusses and concrete is placed, whereby a half-PC board is manufactured.

[0013]

Embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the reinforcing bar truss T includes three main bars 1 and 2.
And a large number of loop muscles 3 that connect the main muscles 1 and 2. Each loop bar 3 is formed in advance into an endless annular shape by using a reinforcing bar, and two parallel rod portions 2a and a pair of arc portions 2 connecting the ends of both rod portions 2a are formed.
b, and the two bar portions 2a have a gap between them so that the main bars 1 and 2 can be inserted, and the length of each bar portion 2a is the main bar 1 when the truss is assembled. ，
It is formed to be equal to the distance between the two.

A plurality of sets of three loop streaks 3 are prepared, and as shown in FIG. 2, each of the three loop streaks 3 of each set constitutes one side of a triangle. By inserting the two main muscles 1 and 2 into the respective loop muscles 3, the respective loop muscles 3 are laid across the main muscles 2 to make the three main muscles 1 and 2 parallel. Next, the main bar 1 serving as the upper chord member is lifted up, and the loop bar 3 is brought close to each set to construct the reinforcing bar truss T as shown in FIG.

The reinforcing bar truss T constructed as described above has a triangular cross section, but the main reinforcing bars 1 and 2 are four, and the number of the loop reinforcing bars 3 of each set is four, and the same as above. And the two main bars 1 serving as the upper chord members are suspended, a reinforcing bar truss T having a rectangular vertical cross section is constructed as shown in FIG.
In addition, the gap between the two rod portions 2a in the loop muscle 3 is reduced toward the center in the longitudinal direction so that the main muscles 1 and 2 passing through the loop muscle 3 extend from the arc portion 2b to the rod portion. 1a Two rod portions 2a connecting the two arc portions 2b of the loop streak 3 so as not to move to the central portion side.
Does not have to be a straight line.

Further, in the above example, the three loop streaks 3 constituting the set are respectively brought close to each other, but as shown in FIG. Further, the assembling of the loop muscles 3 to the main muscles 1 and 2 may be carried out on site, or
It may be assembled in advance in a factory, and may be loaded on a truck or the like in a state of being developed in a plane as shown in FIG.

Even when the loop bar 3 is assembled between the main bars 1 and 2 at the factory and can be carried to the site, it can be carried in a flatly developed state, so that it does not become bulky and does not have to worry about losing its shape. At the site, the reinforcing bar truss T can be easily constructed simply by lifting the upper chord main bar 1. In the manufacture of the half-PC board P using the reinforcing bar truss T, the constructed reinforcing bar truss T having a triangular cross section is placed in the mold 5 so that the longitudinal directions thereof are parallel to each other as shown in FIG. Array multiple,
The upper chord main bar 1 of the reinforcing bar truss T group is lifted and fixed by a supporting member 4 made of H-shaped steel or the like, and a plurality of main bars 6 which are auxiliary bars are connected so as to connect the lower chord main bar 2 of the reinforcing bar truss T group, After arranging the axes in the direction orthogonal to the longitudinal direction of the reinforcing bar truss T and arranging them at a predetermined interval from each other,
Concrete 7 is poured into the formwork 5 to a height such that the lower chord main reinforcement 2 and the auxiliary reinforcement 6 are buried. Then, after the concrete 7 is hardened, the form 5 is removed to manufacture the desired half-PC board P.

Further, by using a reinforcing bar truss T having a rectangular cross section,
A half-PC board P manufactured by the same procedure as above is illustrated in FIG. An example of constructing a floor slab using the manufactured half-PC board P is, as shown in FIG. 6, hoisting the manufactured half-PC board P with a lifting machine (not shown) to a target position. Move to the half PC board P
Is laid for the floor formwork, and styrofoam 8 is placed between the reinforcing bar trusses T instead of the formwork, and in some cases, after the appropriate reinforcement is performed on the upper part, cast concrete 9 is cast. By constructing, an integrated synthetic floor slab is constructed.

By embedding the Styrofoam 8, the constructed synthetic floor slab becomes light in weight.

[0020]

As described above, the reinforcing bar truss of the present invention does not become bulky during transportation, does not lose its shape, and can be easily assembled on site by only lifting the upper main string. it can. By using the reinforcing bar truss, the half-PC board can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a perspective view showing a reinforcing bar truss of an embodiment according to the present invention.

FIG. 2 is a diagram showing a reinforcing bar truss in an unfolded state according to an embodiment of the present invention.

FIG. 3 is a side view showing a reinforcing bar truss of an embodiment according to the present invention and a half PC board using the same.

FIG. 4 is a side view showing a reinforcing bar truss according to a second embodiment of the present invention and a half-PC board using the same.

FIG. 5 is a perspective view showing a reinforcing bar truss of a second embodiment according to the present invention.

FIG. 6 is a side view showing a synthetic floor slab using a half-PC board of an example according to the present invention.

[Explanation of symbols]

 1, 2 Main reinforcement 3 Loop reinforcement 6 Auxiliary reinforcement 7, 9 Concrete T Reinforcing bar truss P Half PC plate

Claims (2)

[Claims] 1. A plurality of upper chord main bars and lower chord main bars are arranged in parallel with each other at a predetermined interval, and a plurality of endless loops are formed between two adjacent main bars of the plurality of main bars. Reinforced truss, characterized in that it is assembled so that the vertical cross-sectional shape becomes a triangle or a rectangle by being hung over the loop reinforcement of. 2. The reinforcing bar truss according to claim 1, wherein a plurality of reinforcing bar trusses are arranged at a predetermined interval in a direction orthogonal to the longitudinal direction of the reinforcing bar truss, and auxiliary bars whose axes are oriented in the array direction of the reinforcing bar truss group. A half PC, in which a plurality of bars are arranged along the longitudinal direction of the reinforcing bar truss, and concrete is placed so that the lower chord main bars and auxiliary bars of the reinforcing bar truss are embedded in the concrete. Board.