JPH0433336B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a precast concrete floor plate that can integrate the entire floor and improve its water resistance.

(Prior art) Conventionally, when constructing the floor part of a structure, if the floor is made of cast-in-place concrete, shoring is installed from above the lower floor, the floor frame is constructed, reinforcing bars are placed, etc. Concrete pouring work is underway for the floor in question.

However, in the case of such on-site pouring, the upper surface of the concrete floor cannot be used as a work floor and shoring cannot be erected until the concrete floor has achieved a specified level of strength, so it is difficult to shorten the construction period. Then there was a problem.

Therefore, the floor was formed using precast concrete plates, and at the site the floor plates were mounted between beams and support walls, and only the mutual connections between the floor plates were made using bolts.
There is an increasing number of cases in which efforts are being made to save labor on site by welding or the like.

(Problems to be Solved by the Invention) However, in conventional precast concrete floor plates, mutual bonding is performed only at a predetermined number of joints as described above. Since it is filled with poured concrete, mortar, etc., it is difficult to integrate the entire floor compared to the above-mentioned cast-in-place concrete floor.

In other words, the PC floorboards are point-joined only at each joint, so when a horizontal force such as an earthquake is applied, stress is concentrated at the joint, and in order to function as a horizontal structure, the joint must be There was a problem that this part was a weak point in smooth stress transmission.

(Means for Solving the Problems) The present invention has been proposed in order to solve the problems of the conventional art. A precast concrete floor plate is used to form and secure a space that can be used immediately, and on the four sides around it, continuous in-situ joints of cast-in-place concrete are formed at a predetermined width, and the floor plates can be integrated with each other using a line joint method. It is characterized by:

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

1 and 2 show an embodiment of the present invention, and a precast concrete floor plate 1 according to the present embodiment has a rectangular shape on a plane, and has four parallel sides in the longitudinal direction and the transverse direction. Continuous on-site joints 4 of a predetermined width are formed along each side, and a working floor portion 5 is secured in the center.

That is, the central part 5 is formed as a completed part equal to the designed floor thickness, and on-site joint parts 4 having a plate thickness thinner than the designed floor thickness are continuously formed on the four sides around it. There is.

Therefore, when constructing a floor, by preparing a predetermined number of floor plates 1 as shown in FIG. A groove-shaped cast-in-place portion 7 is formed along the span direction of the beam 6 at the pair of joint portions 4, 4.

Further, both ends of the floorboard 1 in the longitudinal direction are placed between a beam or a wall (not shown), and are perpendicular to the span direction of the beam 6 at a pair of opposing joints 4, 4 of the adjacent floorboards 1, 1. Cast-in-place portions 7 similar to those described above are formed along the direction in which the holes are formed.

Therefore, concrete is poured into each cast-in-place portion 7 formed around the four circumferences of each floor plate 1, and is allowed to harden so that all floor portions have the designed floor thickness, and the floors of each floor are completed. .

In this embodiment, since the central part 5 of each precast concrete floor plate 1 is a previously completed part, it becomes a space that can be used immediately as a work floor, and the floor plate 1 is placed between the beams 6, 6, etc. After this, a worker can immediately get on the central part 5 and perform various tasks, and also can place construction tools and assemble the support 8 for the upper floor.

In addition, the in-situ joints 4 formed on the four sides are formed continuously in the beam span direction and the direction perpendicular to this, so after filling and hardening the cast-in-place concrete, each floor plate 1 has four circumferences. A continuous so-called line joint will be made along the
Compared to joining floorboards, it is much more possible to integrate the floor.

Therefore, when a horizontal force is applied, the horizontal force can be effectively transmitted as a highly rigid floor horizontal structure, and the horizontal strength can be increased.

In addition, if the span in the direction between the beams is quite large and it is difficult to construct a frame with one precast concrete floor plate 1, and the design conditions are such that two or more floor plates 1 are erected, the lengthwise direction of the floor plate 1 may be Both ends also need to be joined to opposite ends of the adjacent floorboard 1 in the longitudinal direction, but under such conditions, the precast according to this embodiment can be joined continuously on all four circumferences. The concrete floor plate 1 is optimal.

Regarding the structure of the end of the precast concrete floor plate 1, in addition to the built-in reinforcing steel type as shown in Fig. 3, the joining reinforcing bars 9 are attached to the work floor part as shown in Figs. 4 and 5. 5 or a predetermined number of joints may be made to protrude from the edge of the field joint 4, and any joining detail may be adopted depending on the required design strength, without departing from the gist of the present invention. It goes without saying that various modifications are possible.

(Effects of the Invention) The present invention is configured as described above, and can produce the following effects.

(1) Continuous line joints between the on-site joints formed around the four sides can integrate the entire floor and increase the horizontal strength.

(2) If the span in the direction between the beams is quite large and it is difficult to construct a frame with a single precast concrete floor plate 1, and the design conditions are such that two or more floor plates 1 are erected, the four circumferences will be line-jointed continuously. The precast concrete floor plate according to the present invention is the best possible.

(3) Since there is a working floor in the center where workers can immediately get on, it is extremely useful as it can improve the efficiency of on-site work and shorten the construction period.

[Brief explanation of drawings]

Figure 1 is a conceptual diagram of a precast concrete floor plate showing one embodiment of the present invention, Figure 2 is an explanatory diagram showing its construction mode, and Figures 3 to 5 are conceptual diagrams showing the configuration of the end of the floor plate. It is. 1... Precast concrete floor plate, 4...
Field joint part, 5...Working floor part.

Claims (1)

[Claims] 1 It is rectangular in plan, with a completed working floor part equal to the designed floor thickness in the center, and on-site joints with a plate thickness thinner than the designed floor thickness on the four sides around it. A precast concrete floor plate characterized by continuous sections having a predetermined width.