JPS5844140A - Joint method of hollow precast concrete panel - 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 involves forming a plurality of cavities parallel to the longitudinal direction of the rectangular concrete spring at appropriate intervals in the width direction of the panel, and a plurality of cavities buried along these cavities. This article relates to a method for joining hollow prestressed concrete panels (Shinkai Spuncrete), which is made by introducing prestressing using the cive retinsion method into PC@4 materials.

The 1st generation hollow prestressed concrete spring is molded without using a fixed formwork, which is used to manufacture general prestressed concrete springs. That is, the required number of PC@@ (PC steel wire is used) is stretched under tension above the long bed, and the soil is connected between the left and right side forms and between these two side forms. While moving an automatic extrusion molding machine equipped with a rod-shaped core for molding cavities from one end of the bed to the other, hard mixed concrete is poured so that a cavity is formed and the left and right sides are smooth. Next, we used the long concrete panels as a bed, stretched the same PC steel as before, and moved the automatic extrusion molding machine. A similar long concrete panel was formed on top of the previously formed panel, and the same process was repeated one after another to form a multilayered long concrete panel, and the concrete developed a specified strength. After, p
The tension force on the CY4 material is released, prestress is introduced, and the material is cut in layers to the desired length.

Therefore, in a hollow prestressed concrete panel, it is not possible to embed joining metal fittings as seen in general precast concrete panels. For this reason, at both ends in the longitudinal direction, joining iron 6, etc. is embedded in the cavity by post-processing, and connected to the steel H4 bodies such as columns and beams via the reinforcing bars, etc., but at both ends in the width direction of the panel. The joints are carried out using the following two types of joint construction methods.

7, as shown in FIGS. 5 and 6, a semicircular notch hole 20 is bored on both left and right sides of the spring μ, and a reinforcing bar 22 is welded to one end of the steel structure 21. The steel pipe 2B is welded, and the panels are placed side by side in such a way that the notch holes 20 and 20 face each other and are fitted with the steel pipe 2M.
This is a method of filling 0°20 with morta A/24. The other seven are, as shown in Figures 7 and 8, concave portions 2 that are arc-shaped when viewed from the spring/&/hand direction on both left and right sides of the panel.
5 and a recess for bolt insertion, while the steel structure 21
After placing the stud bolts 26 in #I contact with the stud bolts 26 and placing the panels facing each other in a predetermined position, a channel steel 27 with dimensions to fit into the circular concave portions 25 and 25 is attached to the stud bolts 26 with nuts 2.
8 and fill it with morta fi/24.

However, in these construction methods, the joining structure is such that force is transmitted through the mortar 24, so the joining strength of the panels depends only on the mortar/L/24, and the joining strength can be extremely low depending on the degree of filling of the mortar 24. This was considered to be a drawback of hollow prestressed concrete panels, as they lacked reliability in terms of joint strength.

In view of the above-mentioned circumstances, the present invention proposes a highly reliable joining method.In this invention, joining hardware is installed in advance on both left and right sides of a concrete panel so that the outer edge thereof is a 111th century concrete panel. The left and right sides of @-1 were also located inside, and the lower surface was located between the lower surface of the concrete panel and the concrete panel was buried so that the left and right sides of the concrete panel were penetrated in the panel thickness direction. The method is characterized in that a portion of the outer edge of the joining metal fitting is exposed by lifting it off, and these exposed portions are welded to the steel structure.

Embodiments of the present invention will be described below based on the drawings.

Figures 1 and 2 illustrate a hollow prestressed concrete spring/' (ill spancrete) A used in construction method 1 of the present invention, where 1 is a rectangular concrete panel with multiple hollow strips parallel to its longitudinal direction. 2..., and a plurality of PC steel materials buried along these cavities 2... (PC steel wires are used, but PC steel rods, PC steel wires may also be used.
) 3...Introducing prestress using the yoshi retension method.

On both left and right sides at a predetermined position in the longitudinal direction of the concrete panel 1, there is a flat plate part 4, a pair of anchor parts 5 made of reinforcing bars welded to the upper surface of the flat plate part 4 and bent in an inverted prostrate position, and the other parts are also erected. A joining hardware 7 is constructed of a pair of upright portions 6 made of small-diameter reinforcing bars with a small amount of steel.
A state in which the outer edge of the flat plate portion 4 is located inside the left and right sides of the concrete spring/L/1, 91... and the lower surface is located flush with the lower surface S2 of the concrete spring A/1. It is buried in Note that each anchor part 5 is connected to the PC steel material 3 by means such as wire binding. Further, the amount of rise of the rising portions 6 from the lower surface of the flat plate portion 4 is such that the pcw4 material 3m material S is in contact with the upper surface of the rising portion 6.

Next, a method of joining the primary panel A and the steel frame construction 8 such as columns and beams will be explained.

As shown in Fig. 8 and Fig. 4, using holes not shown in the figures, on both the left and right sides of the concrete spring /L/1, and at the positions corresponding to the joining hardware 7... A circular cutout hole 9 is provided in the thickness direction of the panel, and a part of the outer edge of the flat plate portion 4 is protruded, and the panel A is placed on the steel structure 8. The panel A and the steel structure 8 are joined by inserting a welding rod through the notch hole 9 and welding the exposed outer edge of the flat plate R4 to the steel structure 8.

Even when a plurality of springs/I/A are arranged side by side with their left and right 8111 surfaces in close contact with each other, they can be joined in the same manner as in the case described in h.

As described above, the method for joining hollow pre-nutless concrete panels according to the present invention is such that the outer edges of the joining metal fittings are attached to the right and left sides of the concrete panel so that there is no problem in forming the panel by transferring the automatic extrusion molding machine. The concrete panel is buried so that the bottom surface is flush with the bottom surface of the concrete panel, and the left and right sides of the concrete panel are hung in a prone position penetrating in the thickness direction of the panel. Since a part of the outer edge of the hardware is exposed and this exposed part is welded to the steel structure, the lack of strong joint strength, which was considered to be a drawback of hollow prestressed concrete panels, and the joining by mortar filling butt are eliminated. Puffiness and other problems were eliminated, and highly reliable joining became possible.

[Brief explanation of drawings]

The drawings show an embodiment of the method for joining hollow prestressed concrete panels according to the present invention, in which Fig. 1 is a partially cutaway perspective view of the panel, Fig. 2 is a vertical sectional view of the main part, and Fig. 8 shows the joined state. FIG. 4 is a plan view of the main parts shown, and FIG. 4 is a sectional view taken along the line 1-g' in FIG. Fig. 5 is a plan view showing the conventional example, and Fig. 6 is h- of Fig. 5.
The seventh factor is a longitudinal sectional view showing another conventional example, and FIG. 8 is a sectional view taken along line e-c' in FIG. 7. A...Cavity prestressed concrete panel, Sl.
...Left and right sides, 52--Bottom surface, 1...Concrete panel, 2...Cavity, 3...pch
4 materials, 7... joining hardware, 8... steel structure. Figure 3-192- Figure 7 Figure 8

Claims (1)

[Claims] A plurality of cavities parallel to the longitudinal direction of the rectangular concrete panel are formed at appropriate intervals in the width direction of the panel, and zero number of PC ropes are buried along these cavities to pre-tension the concrete panel. In order to join a stress-introduced hollow breastless concrete panel to a steel structure, first place joining hardware on both left and right sides of the concrete panel so that its outer edges are located inside the left and right sides of the concrete panel. , and the concrete panel is buried so that its lower surface is located opposite to the lower surface of the concrete panel, and is hung so as to pass through both left and right sides of the concrete panel in the thickness direction of the panel, and the outside of the joining hardware described in 011 is installed. 1. A method for joining hollow prestressed concrete panels, which comprises exposing a portion of the edge and welding these exposed portions to the steel structure.