JP3165363B2 - Precast concrete floor joint structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for precast concrete floors.

[0002]

2. Description of the Related Art In recent years, prefabrication of building materials has been progressing due to an extreme shortage of skilled engineers and labor saving at construction sites, and the use of precast concrete floorboards for floors is expected to increase in the future. This is because, particularly in office buildings, the use of precast concrete floor boards is desired in place of the conventionally used deck plate method, that is, a method of placing concrete after arranging and wiring on thin steel plates. It is.

[0003] The construction method using a precast concrete slab eliminates the need for concrete casting work and can be used as a work floor immediately after the precast concrete slab is laid. There is an advantage such as realization of a simple working environment, and the greatest advantage is that it is a very effective labor-saving method for mechanized construction that will be further spread in the future.

[0004] Such precast concrete floor slabs are joined by directly connecting connecting bars or metal pieces protruding from joint ends arranged opposite to each other to a beam, and casting concrete between these joint ends. Have gone. However, there is a problem that the welding operation of the joining bars is not only affected by the weather but also that the amount of on-site work is increased, so that the on-site work cannot be sped up and labor can be saved. In order to solve these problems, a connecting structure in which connecting bars are overlapped and arranged has been developed, as shown in FIG.

[0005] In this connection structure, a loop-shaped connecting bar 20 protruding vertically at an appropriate distance from the joint end is inserted between opposing connecting bars 21 to be overlapped and arranged, and the overlapping connecting bars are provided. A through-bar 23 is arranged in the inside 22, and concrete 25 is cast between the joint ends 24.

[0006]

However, in the above-described joint structure, sufficient stress cannot be transmitted unless a reinforcing bar is arranged in the overlapping portion of the connecting bars, and furthermore, the work for arranging the connecting bar requires much time. There was a problem that it was not possible to achieve quick and labor-saving on-site work.

The present invention has been made in view of the above problems, and an object of the present invention is to achieve a connection structure of a precast concrete floor plate capable of achieving sufficient stress transmission, speeding up on-site work, and saving labor. That is.

[0008]

Means for solving the above-mentioned problems are provided by the precast controller according to the first aspect of the present invention.
Junction structure cleat floor, the joint end portion of the precast concrete floor on the upper surface of the beam are opposed, upper and lower positions projecting from the horizontal shape with suitable intervals from these joint ends
The loop-shaped connecting bars are inserted between the connecting bars facing each other and arranged in an overlapping manner, and the bar bars projecting from the upper surface of the beam are inserted into the loops of these connecting bars , and
Reinforcing bars are orthogonally arranged on the upper surface and the upper surface of the lower connecting bar ,
3. A precast concrete according to claim 2 , wherein cast-in-place concrete is cast between the joining ends.
The joining structure of the cleat floor is such that the joining ends of the precast concrete slabs are opposed to each other, and the upper and lower two-step loop-shaped connecting bars projecting horizontally at appropriate intervals from these connecting ends are connected to each other. Reinforcing bars are orthogonally arranged on the upper surface of the upper connecting bar and the upper surface of the lower connecting bar, and a bottom plate is installed on the lower surface between the joint ends to cast in place concrete. The precast concrete floor according to claim 3 , characterized in that
The joint structure according to claim 1, wherein the beam is a steel beam or a precast reinforced concrete beam.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view of a joint structure of a full precast concrete floor slab, FIG. 2 is a plan view of the same, FIG. 3 (1) is a cross-sectional view of a connection end of the full precast concrete floor slab, and (2) and (3) are the same. It is a longitudinal cross-sectional view.

FIG. 1 shows an embodiment of a joint structure of a full precast concrete slab placed on a steel beam, in which joint ends of full precast concrete slabs 2 and 3 are arranged on a steel beam 1 to face each other. The upper and lower two-step loop-shaped connecting bars 4 protruding from the end faces of these joining ends are connected to the connecting bars 5 of the facing full precast concrete floor plate 3.
It is inserted between them and arranged in layers.

A rod-like bar 6 such as a stud bolt protruding from the upper surface of the steel beam 1 is inserted into the connecting bars 4 and 5, and the upper connecting bars 4a and 5a and the lower connecting bars 4a.
b, reinforcement bars 7 with the bar 6 sandwiched on the upper surface of
Are orthogonally arranged, and cast-in-place concrete 9 is cast between the joint ends 8 to join the full precast concrete floorboards 2 and 3 to each other.

[0012] Full precast concrete floorboards 2, 3
The upper connection streaks 5a and the lower connection streaks 5b protrude horizontally at an appropriate distance from each other at an end face at the joint end. The upper connecting line 5a and the lower connecting line 5
3b, as shown in FIG. 3 (2), is formed in a loop shape and overlaps vertically, and is protruded at a position shifted from the connecting bars 4a, 4b of the facing full precast concrete floor plate 2. ing. That is, the connecting bars 4a, 4b are inserted between the facing connecting bars 5a, 5b in a state where the full precast concrete floorboards 2, 3 are arranged facing each other.

As shown in FIG. 3 (3), the connection line 5 is provided only in the upper connection line 5a or in the lower connection line 5b.
It can also be protruded only.

Hereinafter, an example of a method for constructing a joint structure of a full precast concrete floor according to the present invention will be described with reference to FIG. First, the joint end of one full precast concrete floor slab 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 slab 3 is placed on the other side, and the upper and lower stages are placed. Are inserted between the opposing connecting bars 4a and 4b, and are arranged in an overlapping manner.

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

Next, a bar-like bar 6 such as a stud bolt is erected on the steel beam 1 in the loop of the connecting bars 4a, 4b. When the full precast concrete floorboards 2 and 3 are opposed to each other, they can be erected.

Next, cast-in-place concrete 9 is cast between the jointed ends 8 where such reinforcements are arranged, and the full precast concrete slabs 2 and 3 are joined to the steel beam 1 to obtain the combined effect. Can be

FIG. 5 shows a joint structure of the full precast concrete floor plates 2 and 3 on the upper surface of the reinforced concrete beam 10 instead of the above-mentioned steel beam 1, and has the same configuration as above and a similar method. Join with.

FIG. 6 shows a joint structure of a full precast concrete floor in which a full precast concrete floor is joined at another place other than the upper surface of the beam.
3 are joined to each other so as to face each other.
a, 4b are inserted between the facing connecting bars 5a, 5b to be superposed and arranged, and these connecting bars 4a, 4b, 5a,
Reinforcing bars 7 are arranged orthogonally on the upper surface of 5b, and
Cast-in-place concrete 9 is joined to the joint. Further, when the cast-in-place concrete 9 is cast, a temporary or permanent bottom plate 11 is attached to the lower surface between the joining end portions 8.

[0020]

According to the present invention, the joining ends of the precast concrete slabs are arranged opposite to each other on the upper surface of the beam, and a loop-shaped connecting bar projecting horizontally at an appropriate distance from these connecting ends is provided between the facing connecting bars. Inserted and superimposed reinforcing bars are inserted into the loops of these connecting bars, and bar bars protruding from the upper surface of the beam are inserted. Reinforcing bars are orthogonally arranged on the upper surface of the connecting bars. Since the cast concrete is cast, the joining work can be speeded up and labor can be saved.

The joint ends of the precast concrete floor slabs are arranged to face each other, and loop-like connecting bars projecting horizontally at appropriate intervals from these connecting ends are inserted between the facing connecting bars and overlapped. 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 joining ends and cast-in-place concrete is poured, so that precast concrete floor plates are joined together. Also, the joining operation can be speeded up and labor can be saved.

[0022] Precast concrete floorboards can be quickly and easily joined to each other on steel beams or reinforced concrete beams.

The connecting bars project at least above or below the end surfaces at the joint ends, and reinforcing bars are orthogonally arranged on the upper surfaces of these connecting bars, so that the reinforcing bars function as orthogonal bars. 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 is a cross-sectional view of a connection end portion of a full precast concrete slab, (2) is a cross-sectional view taken along the line AA of (1), and (3) is a vertical cross-sectional view of a connection bar having only an upper portion. is there.

FIG. 4A is a cross-sectional view showing a method of joining a full precast concrete floor slab, and FIG. 4B is a plan view of the same.

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 position 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]

 DESCRIPTION OF SYMBOLS 1 Steel beam 2, 3 Precast concrete slab 4, 5, 20, 21 Connecting bar 6 Bar 7 Reinforcing bar 8, 24 Between joining ends 9, 25 Cast-in-place concrete 10 Precast reinforced concrete beam 11 Bottom plate

Continuation of the front page (56) References JP-A-49-73815 (JP, A) JP-A-58-178746 (JP, A) JP-A-49-21914 (JP, A) JP-A-49-113416 (JP, A) , A) Fully open 1979-109310 (JP, U) Fully open 1987-160017 (JP, U) Fully open 4-16208 (JP, U) Fully open 1979-126611 (JP, U) (58) Field surveyed (Int.Cl. ⁷ , DB name) E04B 5/02

Claims (3)

(57) [Claims] 1. A joint end of a precast concrete floor slab is arranged on the upper surface of a beam to oppose, and upper and lower two-stage loop-like connecting bars projecting horizontally from the joint end at an appropriate interval face each other. Inserted between the connecting bars, they are superimposed and arranged, and a bar-like bar projecting from the upper surface of the beam is inserted into the loop of these connecting bars, and the upper surface of the upper connecting bar and the lower bar are connected.
A reinforcing structure for reinforcing a precast concrete floor, wherein reinforcing bars are arranged orthogonally to the upper surface of the connecting bars, and cast-in-place concrete is cast between the connecting ends. 2. The joint ends of the precast concrete floor slabs are opposed to each other, and upper and lower two-stage loop-like connecting bars projecting horizontally at appropriate intervals from these connecting ends are provided between the facing connecting bars. Inserted and layered, top row
Reinforcement bars are orthogonally arranged on the upper surface of the connecting bar of the upper part and the upper surface of the lower connecting bar, and a bottom plate is installed on the lower surface between the joint ends and cast-in-place concrete is precast. Concrete floor joint structure. 3. The joint structure for precast concrete floors according to claim 1, wherein the beams are steel beams or precast reinforced concrete beams.