JPS584053A - Precast concrete plate - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a PC board, and particularly to an improvement of a PC board in which a reinforcing bar joint sleeve (hereinafter referred to as a sleeve) is disposed inside the PC board.

Conventionally, a sleeve disposed inside a PC board has been disposed such that one opening thereof is located flush with the lower end surface of the PC board. Inside the sleeve, a joint reinforcing bar having a length approximately equal to the height of the PC board is placed such that one end is located approximately at the center of the sleeve and the other end protrudes from the upper end surface of the PC board. During construction, the reinforcing bars protruding above the vertically installed PC boards should be covered with other PCC boards.
The plate end sleeve openings are fitted and then grout is injected into the sleeve to bond. In such a PC board, the length of the reinforcing bars for joints that protrudes upward is not sufficient, and there is an inconvenience in fitting the sleeve to the reinforcing bars.

In addition, the reinforcing reinforcing bars placed near the lower end of the PC board are
Since it is disposed on the side surface of the sleeve, there is a drawback that the cover thickness cannot be ensured by a PC board having a normal thickness.

The present invention has been made in view of the above points, and includes arranging the lower opening of the sleeve above the lower end surface of the PC board and providing an insertion hole between the opening of the sleeve and the lower end surface of the PC board. This makes it easier to insert reinforcing bars for the joint into the sleeve during erection, and furthermore, the reinforcing bars placed at the ends of the PCC board are placed below the sleeve, so the outer diameter of the sleeve can also be increased. To provide a PC board that can be placed inside and that can ensure a sufficient cover thickness.

The present invention will be described below based on illustrated embodiments.

In Figures 1 to 3, (1) is a sleeve, and the PC
There is a lower opening at approximately the center of the thickness of plate (2)! A plurality of I(3) are arranged so as to be located above the lower end surface (4) of the PC board (2). This sleeve (1) is formed into a cylindrical shape in which the diameter of the center part is larger than the diameter of both ends,
There is a grout inlet (5) on the side near the lower opening (3).
is provided. This grout inlet (5) communicates with the outside via a hole (6) provided in the PC board (2).

Further, a discharge port (for discharging air within the sleeve (1) during grout injection) is provided near the upper opening;
This discharge port also communicates with the outside like the inlet (5). Furthermore, the inner surface of the sleeve (1) is formed with concavities and convexities (7) for adhering grout that will be injected later.

(8) is the PC from the lower opening (3) of the sleeve (1).
This is an insertion hole that penetrates to the lower end surface (4) of the plate (2). This hole (8) has a diameter on the outer surface side of the PC board (2).
) is formed in a tapered shape so as to be larger than the diameter of the opening (3). (9) is a reinforcing bar for the joint, which has a length approximately equal to the height of the PC board (2), one end of which is located approximately at the middle arrow within the sleeve (1), and the other end of which
It is arranged so as to protrude upward from the upper end surface of the plate (2).

To explain the case of joining the PC board (2) according to the above configuration, from above the joint reinforcing bar (9) protruding from the upper surface of the PC board (2) located on the lower side, the PC board placed on the upper side Fit the insertion hole (8) opened in the lower end surface (4) of (2), and then insert the hole (6) in the PC board (2).
Then, grout is injected into the sleeve (1) and the insertion hole (8) through the grout inlet (5) to join them. In this way, when fitting the sleeve (1) and the reinforcing bar for the joint (9), it is easier to assemble the sleeve (1) because the diameter of the opening is larger than that of a conventional PC board, and the upper part of the reinforcing bar for the joint (9) Since the protrusion length increases as the sleeve (1) moves upward, the worker can perform the joining work in a comfortable posture.

In addition, the insertion hole (8) is not limited to the case where it is formed in the conical shape as described above, but also when the opening on the lower end surface (4) side of the PC board (2) is 1 circle, or when the hole (8) It goes without saying that various shapes can be applied to the hole (8), such as when a part of the hole (8) has a tapered part while the other part has a cylindrical shape.

Thus, 00 is a reinforcing reinforcing bar placed near the lower end of the PC board (2). This reinforcing bar α0 is arranged further below the lower end of the sleeve (1) and at a position substantially in contact with the wall surface of the insertion hole (8). Therefore, conventional PC
Compared to the board, the reinforcing bar α0 can be placed closer to the center of the board thickness, and the thickness of the reinforcing bar 01, that is, the distance from the surface of the reinforcing bar 01 to the surface of the PC board (2), can be measured by optical spectroscopy. can be secured.

Here, a method for manufacturing a PC board according to the present invention will be explained. Generally, when manufacturing PC boards, a formwork is assembled on the bed,
After placing reinforcing bars and other necessary parts within the formwork, concrete is poured.

When a sleeve is placed inside a PC board, conventionally, as shown in Fig. 4, a cylindrical rubber or the like is placed at the sleeve (1) casting position of the formwork U. The threaded rod Q'◆ is inserted through the elastic body U so that the elastic body Q4 is located within the formwork. A pull-out stopper α→ is provided at the tip of the threaded rod 0, and a nut (1) is screwed onto the outside of the formwork αη. ).

Thereafter, when the threaded rod Q4 is rotated and moved to the outside of the formwork Oη, the elastic body αJ is compressed in the axial direction and simultaneously expands in the radial direction, thereby pressing and fixing the inner peripheral surface of the sleeve (1).

In this state, concrete is poured into the formwork αη to form a PC board. On the other hand, when manufacturing the PC board according to the present invention, as shown in FIG. After arranging the parts with the bottom a facing toward the formwork 01, the same steps as in the conventional manufacturing method described above are carried out. And formwork αυ
When demolding, the sleeve (1) is disposed above the lower end surface by removing the cone 0 and the elastic body α field, and the sleeve (1) is oriented from the lower end surface toward the opening of the sleeve (1). Thus, a PC board having a tapered insertion hole formed therein can be manufactured.

As described above, according to the present invention, the sleeve is disposed above the lower end surface of the PC board, and an insertion hole is provided between the openings of the sleeve on the end surface of the PCC board, so that joints can be easily prevented during erection. Low alloy sleeves can be easily made into reinforcing bars. Further, by disposing reinforcing bars below the sleeve, the reinforcing bars can be positioned inward from the outer surface of the sleeve, and a sufficient cover thickness can be ensured.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the present invention; Figure 1 is a front view, Figure 2 is a side view, Figure 3 is a bottom view, and Figure 4 shows a conventional PC board manufacturing method. FIG. 5 is a partial cross-sectional view showing the method for manufacturing a PC board according to the present invention.

Claims (2)

[Claims] (1) In a precast concrete plate with a reinforcing bar joint sleeve arranged inside, the lower opening of the reinforcing bar joint sleeve is arranged above the lower end surface of the precast concrete plate, and the opening of the sleeve and the bottom of the precast concrete plate are arranged. A precast concrete plate characterized by having an insertion hole bored between the end faces. (2) In a precast concrete plate with a reinforcing bar joint sleeve arranged inside, the lower opening of the reinforcing bar coupling sleeve is arranged above the lower end surface of the precast concrete plate, and the opening of the sleeve and the bottom of the precast concrete plate 1. A precast concrete plate, characterized in that an insertion hole is bored between the end faces, and reinforcing reinforcing bars at the lower end of the precast concrete plate are arranged below the reinforcing bar joint sleeve.