JPS6332944B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is capable of reliably preventing the flow of concrete, and also uses a structural member for preventing the flow of concrete as a ruler so that the height of the top of the concrete is precisely constant. The purpose of the present invention is to provide a construction method for pouring and dumping formwork that can also be used as a ruler for concrete slabs and has excellent workability.

Traditionally, when concrete is poured into slabs, the flow of concrete has been prevented by inserting crosspieces or plywood between the slab ribs as weir plates, and by inserting lath from the plastering base between the slab ribs to act as weir plates. how to,
○ This was done by inserting expanded metal such as TS35 between the slab muscles and using it as a weir plate. However, when using these methods, the position of the weir plate is unstable and the concrete may flow out. In particular, method ○B requires demolition work, and methods ○B and ○C In method ○c, the upper and lower ends of the lath or expanded metal are exposed to the concrete surface or are located very close to the surface, resulting in incomplete concrete coverage, and in method ○c, the expanded metal itself The thickness of the slab is large and it is difficult to cut it into dimensions according to the slab thickness and reinforcement spacing.
There are many drawbacks, and no method has yet been established that yields satisfactory results.

In view of this current situation, the present inventors have established the necessary or desirable conditions for concrete pouring of slabs, such as the fact that concrete does not flow out, the ability to double as a ruler for the height of the concrete top, and the following: A frame method was adopted, which did not require dismantling work, and a formwork structure was adopted that allowed conventional reinforcing work to be carried out, in other words, the troublesome work of inserting slab reinforcement horizontally from the side was not necessary. We set conditions such as , double reinforcement for slab reinforcement, and the ability to easily adapt to changes in reinforcement spacing, and developed a construction method that satisfies all of these conditions.

Embodiments of the present invention will be described in detail below with reference to the drawings.

First, prior to reinforcing work, plywood slab formwork 1
A lower end angle 2 having a size equal to the concrete cover thickness required for the slab reinforcement is nailed and fixed at the planned joint position above.

Next, the slab lower end reinforcements 3 are arranged so that they are supported on the lower end angles 2, that is, the lower end angles 2 are used as spacers to ensure a predetermined covering thickness.

In parallel with this, or prior to or after the reinforcement of the slab bottom reinforcement 3, a plurality of studs A made of thin iron plates etc. are attached to the bottom angle 2 avoiding the position of the bottom reinforcement 3 of the slab. Stand up on frame 1.

As shown in the figure, this stud A is made by bending a thin iron plate 4 etc. into a substantially V-shape or substantially U-shape when viewed from above so that it can be elastically deformed in the bending direction by grip force, and has symmetrical upper and lower edges. A pair of notches 4a . . . , 4b .

The width of the notches 4a..., 4b... is set larger than the thickness of the lower end angle 2, and when the stud A is grasped and elastically deformed inward in the bending direction, the notches 4b... are set to be larger than the thickness of the lower end angle 2. to lock it to,
The spacing between the plate parts of the stud A is widened by the elastic restoring force, so that both edges of the notch 4b come into close contact with the rising part of the lower end angle 2. B is a hole to facilitate pouring concrete into stud A.

Next, a thin expanded metal 5 whose rigidity is increased by horizontal ribs a is placed along the front edge of the stud A, and the expanded metal 5 is attached to one end using a binding wire or as shown in the figure.
The expanded metal 5 is fixed to the stud A with a clip 6 made of a metal wire having a hook at the other end that engages with the bent portion of the stud A.

After that, the slab upper reinforcement 7 is arranged above the expanded metal 5. In this case, the vertical width of the expanded metal 5 is set accurately, and the structure is configured such that the lower rib 5a abuts on the slab lower end reinforcement 3 and the slab upper end reinforcement 7 contacts the upper rib 5a as shown in the figure. Then, the expanded metal 5 serves as a spacer to maintain the slab upper end reinforcement 7 at a predetermined height.

Incidentally, the installation of the expanded metal 5, the fixing to the stud A, and the arrangement of the slab upper reinforcement 7 do not necessarily have to be carried out in the above order. For example, the expanded metal 5 may be installed in a lying position on the slab formwork 1, and after the slab top end reinforcement 7 is placed, the expanded metal 5 may be erected and fixed to the stud A; It is also possible to cut it to an appropriate length, insert it under the slab top reinforcement 7, and fix it to the stud A after the slab top reinforcement 7 is arranged.

Next, an upper end angle (this may be a joint bar with an appropriate cross-sectional shape) 8 having the same size as the lower end angle 2 is inserted into the notch 4a on the upper edge side of the stud A and locked between the studs A. erect.

In this state, the upper end angle 8 is in contact with the upper edge of the stud A, and since this stud A has a height equal to the thickness of the concrete slab minus the thickness of the angle, the upper end angle 8 is in contact with the upper edge of the stud A.
The top surface of will display the height of the concrete top. In other words, the upper end angle 8 has both the function as a weir plate portion located above the slab upper reinforcement 7 and the function as a ruler that indicates the height of the concrete top.

Then, place the slab concrete C ₁ on the slab formwork 1 on the expanded metal 5 side at the upper end angle 8.
Concrete concrete is poured to a height flush with the upper end surface, and then poured onto the slab formwork 1 on the stud A side to the same height as the slab concrete C ₁ , as shown by the imaginary line in Fig. 3. , a concrete slab of a predetermined thickness with just the right concrete cover thickness is constructed.

In addition, stud A and upper and lower end angles 8 and 2
As a general rule, they are buried, but depending on the situation, they may be recovered prior to the splicing process and used at other sites.

The present invention has the above-mentioned configuration, and the ribbed expanded metal is stably fixed in position, and the lower end angle is prevented from flowing below the slab lower end reinforcement, and the upper end angle is prevented from flowing above the slab upper end reinforcement. The expanded metal between these upper and lower angles functions as a waste formwork for preventing flow.
There is no risk of concrete flowing out unexpectedly, and the top angle also serves as a ruler to indicate the height of the top of the concrete, eliminating the need for a special ruler. In addition, because the expanded metal is used as the waste formwork, demolition work is labor-saving, and reinforcing work is the same as before, and there is no need to insert reinforcing bars at the top of the slab or the bottom end of the slab from the side. It does not impair construction efficiency. Moreover, since the expanded metal has ribs to increase its rigidity, it is possible to use thin expanded metal, making it easy to cut, and since the materials used are all processed at a low degree, they can be easily and inexpensively manufactured. I can,
Further cost reduction is possible by mass producing a limited number of types depending on the slab thickness.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, with FIG. 1 being a perspective view, FIG. 2 being an enlarged perspective view of a main part, and FIG. 3 being a longitudinal sectional view. 1... Slab formwork, 2... Lower end angle, 3...
...Slab bottom reinforcement, 4a, 4b...notch, 5...expanded metal, 5a...rib, 7...slab top reinforcement, 8...top angle, A...stud.

Claims (1)

[Claims] 1 After fixing the lower end angle at the planned splicing position on the slab formwork, place the slab lower end reinforcement above the lower end angle, and bend the slab in a substantially V-shape or substantially U-shape in plan view. A plurality of studs, each of which is elastically deformable and has a pair of notches formed at symmetrical positions on both upper and lower edges, are locked to the lower end angle via the notches on the lower edge side, and then horizontal ribs are An expanded metal having an appropriate vertical width is placed along the front edge of the stud and fixed to the stud, and after that, or prior to this, a slab top reinforcement is placed above the expanded metal, Next, the upper end angle is installed between the studs in a state where it is locked in the notch on the upper edge side, and slab concrete is placed on the expanded metal side, and then slab concrete is placed on the stud side. Concrete slab ruler-cum-use casting formwork construction method.