JPH09165860A - Joint structure of precast concrete floor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain sufficient stress transmission, rapidness of work and labor saving. SOLUTION: The joint end parts of precast concrete floor plates 2, 3 are opposedly disposed on the upper face of a beam. Looped connecting reinforcements protruded horizontally with an appropriate space from these joint end parts are inserted between opposed connecting reinforcements 5 so as to be lap-arranged, and a bar reinfrocement 6 protruded from the upper face of the beam is inserted into the connecting reinforcements 4, 5. Reinforcing bars 7 are orthogonally arranged on the upper faces of the connecting reinforcements 4, 5, and cast-in-place concrete 9 is placed between the joint end parts 8.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a joint structure for a precast concrete floor.

[0002]

2. Description of the Related Art In recent years, prefabricated building materials have been developed due to the extreme shortage of skilled engineers and labor saving in construction work, and the use of precast concrete floorboards for floors is expected to increase. This is because, especially in office buildings, it is desired to use a precast concrete floorboard instead of the deck plate construction method that has been conventionally used, that is, the construction method in which concrete is placed after reinforcing bars and wiring on thin steel plates. Is.

The construction method using the precast concrete floorboards makes it possible to use it as a working floor immediately after laying the precast concrete floorboards without the work of placing concrete, and to reduce the amount of concrete laid down as a whole, It has the advantage of being able to realize various working environments, and the biggest advantage is that it is a labor-saving construction method that is very effective for mechanized construction, which will spread further in the future.

[0004] In joining such precast concrete floorboards, connecting bars protruding from joint ends arranged opposite to each other or a metal object is directly welded to the beam, and concrete is placed between these joint ends. I am going. However, there has been a problem that the welding work of the joint bar is not only affected by the weather, but also the amount of work on site is increased and it is not possible to speed up the work and save labor. Therefore, in order to solve these problems, a connection structure has been developed in which connection bars are arranged in layers, and there is a connection structure as shown in FIG.

In this connection structure, a loop-shaped connecting bar 20 projecting vertically from the joint end at an appropriate interval is inserted between opposing connecting bars 21 and stacked, and the overlapping connecting bars are connected. Through bars 23 are laid in 22 and concrete 25 is placed between the joint ends 24.

[0006]

However, in the joint structure as described above, sufficient stress cannot be transmitted unless the reinforcing bar is arranged in the overlapping portion of the connecting bar, and moreover, it is troublesome to arrange the reinforcing bar. There is a problem in that it is not possible to speed up and save labor on site.

The present invention has been made in view of the above problems, and an object thereof is to achieve a connection structure of precast concrete floorboards which can achieve sufficient stress transmission, speedy field work and labor saving. That is.

[0008]

[Means for Solving the Problems] Means for solving the above-mentioned problems are as follows. Joining ends of a precast concrete floorboard are opposed to each other on the upper surface of a beam, and the joining ends are horizontally arranged at appropriate intervals. The protruding loop-shaped connecting muscles are inserted between the opposing connecting muscles to be overlaid, and the rod-shaped muscles protruding from the beam upper surface are inserted into the loops of these connecting muscles, and the upper surface of the connecting muscles. Reinforcing bars are arranged orthogonally to each other, and it is assumed that cast-in-place concrete is placed between the joint ends. The loop-shaped connecting bars protruding from the are inserted between the opposing connecting bars and stacked, and reinforcing bars are orthogonally arranged on the upper surfaces of these connecting bars, and on the lower surface between the joint ends. Set the bottom plate And the poured concrete is pouring, the beam is steel beam or reinforced concrete beams, the connecting muscles and that projecting from the at least the upper or lower side of the end face at the connection end.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 is a cross-sectional view of a joint structure of a full precast concrete floorboard, Fig. 2 is a plan view of the same, Fig. 3 (1) is a cross-sectional view of a connecting end portion of a full precast concrete floorboard, and (2) and (3) are the same. FIG.

FIG. 1 shows an embodiment of a joint structure of a full precast concrete floor board placed on a steel beam. The joint ends of the full precast concrete floor boards 2 and 3 are arranged on the steel beam 1 so as to face each other. , The upper and lower two-tiered loop-shaped connecting bars 4 projecting from the end faces of these joint ends are the connecting bars 5 of the facing full precast concrete floorboard 3.
It is inserted between and stacked.

A bar-shaped bar 6 such as a stud bolt protruding from the upper surface of the steel beam 1 is inserted into each of the connecting bars 4 and 5, and the upper connecting bars 4a and 5a and the lower connecting bar 4 are inserted.
b and 5b, the reinforcing bar 7 with the bar-shaped bar 6 sandwiched therebetween.
Are laid out orthogonally, and in-situ cast concrete 9 is placed between the joining end portions 8 to join the full precast concrete floorboards 2 and 3 to each other.

Full precast concrete floorboards 2, 3
Has an upper connecting bar 5a and a lower connecting bar 5b protruding horizontally from the end surface at the joint end with appropriate intervals. These upper connecting bar 5a and lower connecting bar 5
As shown in (2) of FIG. 3, the b is formed in a loop shape and vertically overlaps with each other, and is projected at a position displaced from the connecting bars 4a and 4b of the facing full precast concrete floorboard 2 with each other. ing. That is, the connecting bars 4a and 4b are inserted between the connecting bars 5a and 5b facing each other in a state where the full precast concrete floorboards 2 and 3 are arranged to face each other.

Further, as shown in (3) of FIG. 3, the connecting bar 5 has only the upper connecting bar 5a or the lower connecting bar 5b.
It is also possible to project only.

An example of a method for constructing a joint structure for a full precast concrete floor according to the present invention will be described below with reference to FIG. First, the joint end of one full precast concrete floorboard 2 is placed on one side of the upper surface of the steel beam 1, and the joint end of the other full precast concrete floorboard 3 is placed on the opposite side, and the upper and lower stages are placed. The connecting muscles 5a and 5b are inserted between the connecting muscles 4a and 4b which face each other, and are stacked.

Next, reinforcing bars 7 are arranged orthogonally on the upper surfaces of the upper connecting bars 4a, 5a and the lower connecting bars 4b, 5b. The reinforcing bars 7 are connecting bars 4a, 4b, 5 when the full precast concrete floorboard 3 is placed on the steel beam 1.
It can also be placed on the upper surfaces of a and 5b in advance.

Next, a bar-shaped bar 6 such as a stud bolt is erected on the steel beam 1 in the loop of the connecting bars 4a and 4b, which is either erected in advance on the steel beam 1 or It is also possible to stand upright when the full precast concrete floorboards 2 and 3 are opposed to each other.

Next, in-situ cast concrete 9 is placed between the joint ends 8 with such reinforcement, and the full precast concrete floorboards 2 and 3 are joined to the steel beam 1 to obtain the synthetic effect. To be

FIG. 5 shows a joint structure of the full precast concrete floorboards 2 and 3 on the upper surface of the reinforced concrete beam 10 in place of the above-mentioned steel frame beam 1. The structure is the same as the above, and the same method is used. Join with.

Further, FIG. 6 shows a joint structure of a full precast concrete floor in which the full precast concrete floor is joined at another place other than the upper surface of the beam, and in this case also, the full precast concrete floor 2,
The joint ends of 3 are butted against each other, and the connecting bar 4
a and 4b are inserted between the connecting muscles 5a and 5b which face each other to form a stacked arrangement, and these connecting muscles 4a, 4b, 5a,
Reinforcing bars 7 are orthogonally arranged on the upper surface of 5b, and the space between the joint ends 8
The cast-in-place concrete 9 is poured into and joined. When the cast-in-place concrete 9 is poured, a temporary or permanent bottom plate 11 is attached to the lower surface between the joint end portions 8.

[0020]

EFFECTS OF THE INVENTION Joint ends of precast concrete floorboards are arranged on the upper surface of a beam so as to face each other, and loop-shaped connecting ribs projecting horizontally from these joining ends at appropriate intervals are provided between the opposing connecting ribs. Inserted and overlaid, bar-shaped bars protruding from the beam upper surface are inserted in the loops of these connecting bars, and reinforcing bars are orthogonally arranged on the upper surface of the connecting bars, and the site between these joint ends Since the concrete is poured, it is possible to speed up the joining work and save labor.

The joining ends of the precast concrete floorboards are arranged opposite to each other, and the loop-shaped connecting bars projecting horizontally from these joining ends at appropriate intervals are inserted between the connecting bars facing each other, and the overlapping reinforcing bars are arranged. Reinforcing bars are orthogonally arranged on the upper surface of these connecting bars, and a bottom plate is installed on the lower surface between the joint ends, and when cast-in-place concrete is poured, the precast concrete floor boards are joined together. In addition, it is possible to speed up the joining work and save labor.

Precast concrete floorboards can be joined quickly and easily on steel beams or reinforced concrete beams.

The connecting bar is provided so as to project at least above or below the end face at the joint end, and the reinforcing bar is arranged on the upper surface of these connecting bars so that the reinforcing bar functions as an orthogonal bar. Therefore, the bonding strength can be increased and the stress can be sufficiently transmitted.

[Brief description of the drawings]

FIG. 1 is a sectional view of a joint structure of a full precast concrete floor on a steel beam.

FIG. 2 is a plan view of a joint structure of a full precast concrete floor.

FIG. 3 (1) is a cross-sectional view of the connection end portion of the full precast concrete floorboard, (2) is a cross-sectional view taken along the line AA of (1), and (3) is a vertical cross-sectional view of the connecting bar only at the upper part. is there.

FIG. 4 (1) is a sectional view showing a method for joining full precast concrete floorboards, and FIG. 4 (2) is a plan view thereof.

FIG. 5 is a cross-sectional view of a joint structure of a full precast concrete floor on a precast reinforced concrete beam.

FIG. 6 is a cross-sectional view of a joint structure of a full precast concrete floor at a portion other than the upper surface of the beam.

FIG. 7 is a cross-sectional view of a joint structure of a conventional full precast concrete floor.

[Explanation of symbols]

 1 Steel beam 2, 3 Precast concrete floorboard 4, 5, 20, 21 Connection bar 6 Bar-shaped bar 7 Reinforcing bar 8, 24 Between joint ends 9, 25 Cast-in-place concrete 10 Precast reinforced concrete beam 11 Bottom plate

Claims (4)

[Claims] 1. A joining end portion of a precast concrete floorboard is arranged on the upper surface of a beam so as to face each other, and a loop-shaped connecting bar protruding horizontally from these joining ends at appropriate intervals is provided between the facing connecting bars. Inserted and overlaid, bar-shaped bars protruding from the beam upper surface are inserted in the loops of these connecting bars, and reinforcing bars are orthogonally arranged on the upper surface of the connecting bars, and the site between these joint ends Precast concrete floor joint structure characterized by pouring concrete. 2. The precast concrete floorboard has joint ends arranged opposite to each other, and loop-shaped connecting bars projecting horizontally from the joining ends at appropriate intervals are inserted between the facing connecting bars to overlap each other. Reinforcing bars are arranged on the upper surface of these connecting bars at right angles, and a bottom plate is installed on the lower surface between the joint ends, and cast-in-place concrete is placed, and the precast concrete floor is characterized by Junction structure. 3. The precast concrete floor joint structure according to claim 1, wherein the beam is a steel frame beam or a precast reinforced concrete beam. 4. The precast concrete floor joint structure according to claim 1 or 2, wherein the connecting bar is provided so as to project at least above or below an end face of the joint end.