JPS6149049A - Pc member of beam - 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] (Industrial application field) The present invention relates to PC members such as beams.

(Prior Art) A PC beam 1a shown in FIG. 4 has been proposed as a PC member. The PC beam consists of a PC portion 2a, a reinforcing bar cage 3a, and an expanded metal 4a. PC part 2a
The inside is hollow and the top end is open, and the reinforcing bars 3a are buried in the PC part except for the top end, and the metal is placed on the inner surface of the hollow part and fixed with a rib (not shown). PCCl
In the 2O manufacturing method, a metal 4a is set inside the reinforcing bar cage 3a and fixed with a frame, an outer formwork is assembled on the outside of the reinforcing bar cage, and concrete is poured between the metal and the outer formwork using the metal as the inner formwork. and form a beam. The method for using the Pc beam 1a is to install the PC beam and pour the entire slab concrete, and at the same time, pour the concrete into the hollow part of the iPc beam 1a, and fix it to the entire slab 6 at the upper end of the reinforcing bar 3a. hand,
This PC beam is integrated with the slab.

(Problem to be solved by the invention 9 However, with conventional PC members, all metal reinforcing bars are placed inside the cage, so it takes time and effort to insert and set.
Moreover, it requires a rib to hold the metal, and the thickness of the PC part becomes thicker, making the PC member heavier.
The fixing performance between concrete and metal is poor when forming the material.

(Means for solving all problems) The PC HBB1011 of the present invention has the PC parts 2, 12
and reinforcing bar cages 3 and 13 and wire meshes 4 and 14, and PCj
J has a hollow part 21.121i between the axes, the reinforcing bar cage is located on the inner surface of the hollow part, and the wire mesh is attached to the outside of the reinforcing bar cage to cover the outer part. The portion covered by the wire meshes 4, 14 is the entire outer periphery of the reinforcing bars 3° 13 or the outside portion of the car located within the PC portions 2, 12. Rebar 3
．． 13 includes those assembled in advance by welding or the like in a factory, and those arranged in a cage shape using grid wires on site.

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

In FIG. 1, the PC portion 2 of the PC beam 1 has a hollow portion 21 and is open at the top. The reinforcing bar 3 is the hollow part 2
It is located on the inner surface of PC part 1, and its upper end protrudes from the upper end of PC part 2 toward the upper blade. Note that the reinforcing bars 3 have stirrups 33 wrapped around the upper end reinforcements 32 and lower end reinforcements 31, and the upper end reinforcements are arranged when the PC beam 1 is constructed. P at reinforcing bar 3
The outer part located within the C part 2 is covered with a wire mesh 4.

This wire mesh is stretched over the cage as a reinforcing steel stirrup 33 with full strength.

Here, manufacturing of the PC beam 1 will be explained.

First of all, the outer pcf of reinforcing steel and 3! Paste the wire mesh 4 on the part located within iB 2 using the stirrup 33 as a frame, then set the entire outer form with a predetermined cover thickness on the outside of the wire mesh, and finally set the wire mesh and outer form. All concrete will be poured during this period. During concrete pouring, the wire mesh 4 functions as an inner formwork, and the mesh part becomes a rough surface to improve adhesion to concrete, and the PC part can also be used as a structure.

Next, how to use the PC beam 1 will be explained with reference to FIGS. 1 and 2. After installing the PC beam 1 and assembling the slab formwork, arrange the upper end reinforcement 32 inside the upper end of the reinforcing bar 3,
After placing slab reinforcement, pour slab concrete,
At the same time, concrete 5 is also poured inside the 'ik PC beam 1'. In this way, the upper ends of the reinforcing bars 3 of the PC beam 1 are buried and fixed in the slab concrete, and the PC beam and the floor 6 are integrated.

FIG. 3 shows another embodiment. In this example, the PC member is P
It is CCl2O. The PCCl2O configuration is also substantially the same as PC beam 1. 12 is the PC part, 13 is the reinforcing cage,
14 is a wire mesh attached to the outer surface of the reinforcing cage. The PC section 12 has a hollow space 121 in the axial direction, and both upper and lower ends of this hollow space are open, and concrete 5 is placed therein during use.

(Effects of the Invention) As explained above, according to the present invention, a wire mesh is stretched on the outside of the reinforcing bar cage and is attached to the mesh reinforcing bars, so that the thickness of the PC part can be reduced compared to the conventional method. The weight of the PC member can be reduced because it is not thick and no ribs are required, making it easier to install, requiring only a small lifting machine, and the mesh part has a rough surface, making the PC material easier to install.
The adhesion performance of the parts to concrete is increased and the PC parts can also be used as structures.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a PC beam, Fig. 2 is a sectional view showing the state of use, Fig. 3 is a sectional view of a PC column, and Fig. 4 is a sectional view of a conventional PC beam. 1.11... PC member, 2, 12... PC part, 2
1.121...Hollow part, 3,13...Rebar cage, 4
゜14...wire mesh. that's all

Claims (1)

[Claims] A PC part having a hollow part in the axial direction, a reinforcing bar cage located on the inner surface of the hollow part, and a wire mesh attached to the outside of the reinforcing bar cage and covering the outer subdivision of the reinforcing bar cage located in the PC part. PC parts such as beams.