JPH0380948B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for installing reinforcing bars for integrating partition concrete blocks in reinforced concrete construction.

Conventionally, the insertion reinforcement of concrete blocks was the first
As shown in the figure, a reinforcing bar 1 bent into an L shape is made to pass through the slab formwork 2 with one end and protrude further downward, and the other end is tied along the slab reinforcing bar 3 to make an inverted L shape.
Use a downward-pointing bar 1a in the shape of a letter, or tie it with one end pointing upwards and the other end along the slab reinforcing bar.
It was a letter-shaped floor rising insert 1b. These reinforcing bars are jointed to the upper ends of the vertical reinforcing bars of the concrete block partitions on the lower floor in the case of downward inserts, and are jointed to the vertical reinforcing bars of the concrete block partitions on the upper floor in the case of upright inserts. This is for jointing the lower end of reinforcing steel.

In this method, the downward inserts penetrate the slab formwork, making it difficult to remove the formwork later.
Moreover, the formwork itself has the disadvantage that it is unsuitable for repurposing as it creates flaws, and on the other hand, the floor riser bars have the disadvantage that they tend to collapse or move during concrete pouring.

The present invention aims to solve these drawbacks all at once.

That is, the gist of the present invention is to temporarily fix an insert having female threads on the upper and lower surfaces to a slab formwork, and to screw a threaded reinforcing bar with at least one end threaded from above the female thread to form an upright insert, After that, slab concrete is poured and the slab formwork is demolded, and another threaded reinforcing bar is screwed into the female thread on the lower surface of the insert exposed at the bottom of the slab, and this threaded reinforcing bar is attached to the floor below the slab. A method for constructing inserts for concrete blocks characterized by forming downward inserts for jointing to the upper ends of vertical reinforcing bars of concrete block partitions.

Embodiments of the present invention will be described below with reference to the drawings. Fig. 2 shows the insert 5 temporarily fixed to the slab formwork 2 with nails 4 etc. through the temporary fixing part 5a during concrete pouring, and Fig. 3 shows the insert 5 temporarily fixed to the slab formwork 2 through the temporary fixing part 5a with the upper female thread 5c provided on the upper surface. A state in which a threaded reinforcing bar 6 that has been threaded is screwed into the section to form a threaded floor upright insert 6a is shown. Incidentally, the lower surface of the insert 5 is also provided with a female thread 5b.
The lower female thread 5b and the upper female thread 5c may penetrate through each other.

In this state, after concrete is poured and the formwork is removed, another threaded reinforcing bar 6 is screwed into the exposed lower female thread 5b from below to form a threaded downward insert bar 6b (Fig. 4). . Note that the appropriate length for screwing in the reinforcing bars is approximately 25 mm. It goes without saying that the longitudinal reinforcing bars 8 of the concrete block are wrapped around these inserts to integrate the concrete block 9 and the reinforced concrete slab.

The insert used in the above method may be a conventional insert as shown in FIG. 5 as long as it has internal threads on the upper and lower surfaces, but preferably, the temporary fixing part 5a of the insert is attached to the flange as shown in FIG. The hole is shaped like a hole, projects laterally from the insert body, and has a width that prevents the hammer 7 from hitting the nail when driving a nail inserted into the hole. Then, the upper female thread 5c will not be distorted, and
To increase the resistance against falling when insert reinforcing bars 6a are attached.

As described above, according to the method of the present invention, there is no need to provide through holes in the formwork, and there is little fear that the reinforcing bars will collapse or move, so it is advantageous for reusing the formwork and facilitates construction. It has the effect of

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing the assembly of conventional concrete block inserts, and FIGS. 2 to 4 are longitudinal sectional views showing embodiments of the method according to the present invention in the order of construction. FIGS. 5 and 6 are elevational views of inserts for use in the present invention. 1... L-shaped reinforcing bar, 1a... Downward insert bar, 1b
...Floor riser, 2...Slab formwork, 3...
Slab reinforcing bar, 4...nail, 5...insert, 5a
...temporary fixing part (flange), 5b...lower female thread,
5c...Top female thread, 6...Threaded reinforcing bar (concrete block insert), 6a...Threaded floor rising bar, 6b...Threaded downward insert bar, 7...
...Hammer, 8...Vertical reinforcing bars, 9...Concrete block.

Claims (1)

[Claims] 1. Temporarily fasten an insert with female threads on the upper and lower surfaces to the slab formwork, and screw a threaded reinforcing bar with at least one end threaded from above the female thread to serve as a standing bar, and then pour slab concrete. , After demolding the slab formwork, screw another threaded reinforcing bar into the female thread on the bottom surface of the insert exposed on the bottom surface of the slab, and use this threaded reinforcing bar as a vertical reinforcement reinforcing bar of the concrete block partition on the floor below the slab. A construction method for a concrete block insert, which is characterized by forming a downward insert for jointing at the upper end.