FI72371B - ANORDINATION FOR FRAME STEERING AV CONTAINER AVIAEMNINGSPLATTOR AV BETONG - Google Patents

Description

1 72371

Apparatus for making elongated concrete screeds

The invention relates to an apparatus for producing elongate screeds in concrete, as defined in the preamble of the appended claim.

Swedish patent application 8001663/7 discloses a method for producing concrete floors of high quality in relation to flatness and appropriate construction. That invention uses sliding rails for vibrating beams used in a floor manufacturing method using solid molds. Equipping the tiles with either holes or both holes and holders can provide continuous reinforcement, as a result of which no shrinkage cracks are created in the floor along these tiles.

In the manufacture of these tiles, a number of problems have been encountered, all of which have been solved by generally known techniques (e.g. by the use of hard-wearing cement grades). However, one problem has proven to be much more complex. It relates to the fact that when casting tiles, which is done in so-called radiator molds, the tiles must be linear. The difficulty is partly due to the fact that it is difficult to form sufficiently linear molds and that after repeated use, the molds become non-linear in shape due to their handling. According to the present invention, a device is proposed which enables manufacture using inexpensive molds suitable for imparting good linearity to tiles.

Molds are made by attaching mold tubes to a beam grate so that the top surface of the beams forms the bottom of the mold and two tubes on each side of the beams form the side surfaces of the mold. The mold is thus open at the top for placing reinforcement and pouring concrete. Mold tubes can be made in two halves that can be bent to the desired cross-sectional shape. The halves are then joined together by spot welding.

The use of injection molded aluminum has also been tried, but after treatment the condition of this product became really bad. Because this was the case, it was even less possible to produce tiles of the right shape. In addition to all this, aluminum has the disadvantage that it is corroded by concrete, as a result of which the surface of the product becomes rough.

It has proved possible to produce good quality tiles using the so-called radiator method. It is characterized by the fact that several tiles are produced simultaneously in a large mold. Thus, casting costs and casting work are reduced. However, there is still the problem of making the tiles linear. According to DE-177 548, this problem has been solved by using different clamps to bring the mold parts into the desired position, and according to US-2 883 728, clamps with perpendicularly arranged arms and adjustable arms have been used to solve the same problem.

According to the invention, this is solved by means of a device as defined in the characterizing part of the appended claim. According to the invention, the slabs are formed by means of parallel tubes located close to each other. In the mold, the outer sides of these pipes form the side boundary surfaces of the concrete. By placing these pipes on a base formed by the beams, the beams also provide a lower restraining surface. The beam base consists of a frame formed by strong beams, in which case the length of the frame can be 5-10 meters and the width 1-2 meters. Dimensions can be chosen to fully match the capacity of the lifting equipment (forklifts or overhead cranes) available at the workplace. Within the frames, the beams 3 72371 run at regular intervals, i.e. parallel to the long sides. The tubes are then positioned so that the beams form the underside of the mold. The invention means a system in which the pipes are fastened and straightened so that their linearity is at least as good as that of the beams.

As for pipes with an almost circular cross-section, the part of their circumference which is to form the base is somewhat flattened. This flattening is performed within a central angle of about 30-90 °. Attached to the center of this flattened surface is a rail in the shape of an inverted T. However, the rail is cut at regular intervals.

These breakpoints can occur, for example, every meter and can be 5 cm long. This can be varied within wide limits, and the dimensions presented above are only intended to facilitate the understanding of the operation. Slabs with the upper surface of which is in the same plane as the upper surface of the beams are placed at the same intervals as the rail break points on the beam base and between the beams. The plates are provided with a Y-shaped cut, the opening of which is arranged so that the web of the T-shaped rail fits the Y-shaped cut. The wider part of the Y-shape is used to adjust the rail in case the non-linearity of the tube would prevent direct insertion.

Both Figures 1 and 2 show an embodiment of the invention. Figure 1 shows the mold in cross section.

Figure 2 shows a plate between the beams, which together with the inverted T-shaped rail formed by the mold tube ensures that the mold tubes are in the correct position both vertically and horizontally. This is also important to achieve a good connection between the formwork pipes and the beams so that the concrete cannot leak. This causes fouling, but also, if concrete can leak, the formation of a so-called "burr" in the finished concrete product.

_______ TT “4 72371

Fig. 1 is a cross-sectional view showing the operation of the above-mentioned plate and the plate provided with a section. On top of two parallel beams 1 located close to each other, a pipe 3 is placed, the circumferential part of the lower part of which is planar.

This tube shows a T-rail 4, which at certain break points extends along the tube 3.

Figure 2 shows a top view of the plate 5. The plate 5 has a Y-shaped section 6 which is divided into an inner part 7 and an expandable outer part 8.

It is, of course, very important that the beam base is made of strong beams and that it is made exactly planar. The entire beam base is then placed on three or more supports, which in turn are provided with vibrators to ensure satisfactory casting.

Claims (1)

72371 Apparatus for casting elongate, highly linear concrete bodies in the so-called in a radiator-type mold, in which the molds are pipes (3) having a substantially circular cross-section, arranged above the beams (1), between those beams inside the frame running parallel to the longitudinal sides of the frame, the beams (1) forming the lower interfaces of the frame and two parallel forming its side interfaces, characterized in that the substantially circular cross-section of the tubes (3) is altered at its lower part so that the space between the two beams (1) is crossed by a planar part provided below by a longitudinal rail (4) with an inverted T and which is cut in the direction of the tubes (3) at several points equal to each other, that plates (5) with a Y-shaped cut (6-8) are fastened between the beams (1) and that the plates (5) are thus attached that all the cuts are turned in the same direction in the longitudinal direction of the beams and ova t so arranged that their upper surface is flush with the upper surface of the beams (1), that the distance between the plates (5) should be the same as the distance between the break points on the rail (4) with the pipes (3), so that the plates (5) 1) and by pressing the end surfaces of the rails (4) against the cuts of the plates (5), the rail (4) of the tube (3) is forced into the inner part (7) of the cut and the guide of the tube (3) is provided vertically and transversely.