DE10146818A1 - Reusable form insert to form recess in concrete, etc., for heating, ventilation and installation conductors; has hinge parts of galvanised steel plate that can be assembled and secured with bolts - Google Patents

Abstract

The insert has eight equally sized hinge parts (1) made of galvanised steel plate. The hinge parts are cut and the projections curved, so that they can each be assembled into one hinge. The hinge pieces are assembled and held with eight holder bolts (2), which are flanged at top and bottom, to form a moving frame. A locking bracket (3) is welded at the upper side of four hinge parts, to fit in locking latches on the other four hinge parts, that are secured with screws and stop nuts (5), to stabilise the side walls.

Description

This invention - reusable formwork insert - made of steel is particularly suitable for Recesses in concrete, in concrete slabs and ceiling ducts for heating, ventilation and Installation cables. The standard size is L 250 × W 250 × H 200 mm.

Furthermore, the formwork insert can also be used for larger recesses:

• 1. By producing a formwork insert with a larger size or
• 2. By assembling several standard inserts.

With two formwork inserts there is a recess z. B. for a gully in a floor slab or a ceiling guide for several pipes.

With four formwork inserts assembled in a square you get a slab opening for a fireplace.

The formwork insert made of galvanized sheet steel consists of eight equally large hinge parts ( 1 ) for the frame, eight retaining bolts ( 2 ), four locking tabs ( 3 ), four locking bolts ( 4 ), four screws with stop nuts ( 5 ) and a stabilizing plate ( 8 ).

The hinge parts ( 1 ) for the frame are cut out and the protrusions are bent so that when assembled they form a hinge. A cranked locking tab ( 3 ) is welded to four hinge parts ( 1 ) on the upper side, on the inside on the right.

By assembling all the hinge parts with the retaining bolts ( 2 ), which are crimped at the top and bottom, you get a self-moving frame.

By attaching the four locking bolts ( 4 ) to the other four hinge parts ( 1 ) using a screw and stop nut ( 5 ), the side walls of the formwork insert are stabilized.

A stabilizing plate ( 8 ) is used to achieve stabilization (against twisting).

It consists of two differently sized sheet metal strips ( 6 + 7 ), the right and left corners of which are each bent in a right-angled triangle by 90 °.

The smaller of the two curved parts is inserted into the larger part and tacked together so that a stabilizing plate ( 8 ) is obtained. It can be removed immediately after the concrete has been filled.

After the concrete has set, the four side walls are opened by folding up ( 9 ) the four locking bolts ( 4 ).

The pivots in the middle of each side wall are then knocked lightly pressed inwards.

This causes the formwork insert to contract ( Figure 2) and is therefore easy to remove. The formwork insert can also be made of different metals, plastic or in combination with other materials.

Formwork for recesses and ceiling ducts are still used in many cases sawn boards, made by nailing together and need after setting the concrete with a lot of effort, which makes them unusable up to 90%.

This type of formwork production involves a lot of work and material and therefore very expensive.

In contrast, the system of "reusable formwork insert" brings enormous relief and time saving.

The special advantages of the formwork insert are its simple production method, the fast and easy handling, its light weight and space-saving storage (thanks to Folding the frame).

The biggest advantage of using formwork, however, is the constant reusability and the result achieved cost savings compared to the conventional formwork described above.

With good care, removal of the residual concrete and oiling, you can achieve a very long time Period of use.  

Reusable formwork insert reference numeral

1

hinge part

2

retaining bolt

3

flap

4

locking latch

5

Screw and stop nut

6

sheet metal parts

7

sheet metal parts

8th

stability plate

9

folding

Claims (2)

1. The reusable formwork insert for the production of recesses in the concrete is a self-moving formwork element ( Figure 2), which can be made of different types of metal, plastic or in combination with other materials and in different sizes. 2. Formwork insert according to claim 1, characterized in that it consists of eight equal-sized and curved hinge parts ( 1 ), which are assembled and provided with eight retaining bolts ( 2 ), result in a movable frame. A stabilization of the side walls is achieved by welding four locking tabs ( 3 ) and attaching four locking bolts ( 4 ) using screws and stop nuts ( 5 ) on the upper side and the opposite pivot points of each side wall.
To stabilize against twisting, a stabilizing plate ( 8 ) is used at one of the four corners, which consists of two sheet metal parts ( 6 + 7 ) cut, bent and stapled to different sizes.