US3399438A - Guiding means for sliding shuttering for building structures with slightly inclined and vertical concrete walls - Google Patents

Description

3,399,438 DING Se t. 3, 1968 G. ROHLF GUIDING MEANS FOR SLIDING SHUTTERING FOR BUIL STRUCTURES WITH SLIGHTLY INCLINED AND VERTICAL CONCRETE WALLS 4 Sheets-Sheet 1 Filed July 14, 1965 Sept. 3, 1968 (3 ROHLF' 3,399,438

GUIDING MEANS FOR SLIDING SHUTTERING FOR BUILDING STRUCTURES WITH SLIGHTLY INCLINED AND VERTICAL CONCRETE WALLS Filed July 14, 1965 4 Sheets-Sheet 2 Fly. 3

p 1968 G. ROHLF GUIDING MEANS FOR SLIDING SHUTTERING FOR BUILDING STRUCTURES WITH SLIGHTLY INCLINED AND VERTICAL CONCRETE WALLS 4 Sheets-Sheet 5 Filed July 14, 1965 Sept. 3, 1968 ROHLF GUIDING MEANS FOR SLIDING SHUTTERING FOR BUILDING STRUCTURES WITH SLIGHTLY INCLINED AND VERTICAL CONCRETE WALLS Fild July 14, 1965 4 Sheets-Sheet 4 United States Patent 3,399,438 GUIDING MEANS FOR SLIDING SHUTTERING FOR BUILDING STRUCTURES WITH SLIGHTLY INCLINED AND VERTICAL CONCRETE WALLS Giinter Rohlf, Goebenstrasse 18,

Dusseldorf, Germany Filed July 14, 1965, Ser. No. 471,818

5 Claims. (Cl. 25-131) ABSTRACT OF THE DISCLOSURE Sliding framework for building concrete structures wherein a plurality of horizontally adjustable shuttering plate guides are mounted from a support with a plurality of shuttering plates being suspended from the guides, and means for lifting the plates.

Each guide has two parallel limbs to the inner side of which facing one anotherthe plates are secured with the limbs being interconnected via a girder to which theliftingmeans is affixed. The limbs have downward exten sions of sufficient length to reach a hardened concrete wall portion and with which movably mounted members on the extensions would be engageable to guide the plate guides.

This invention relates to sliding formwork for building molded concrete structures with slightly inclined walls, such as chimneys for example. With the systems of slidable formwork hitherto known it has usually only been possible to produce walls with vertical surfaces. Insofar as at tempts have been made to build structures with slightly inclined wall surfaces, this has been done with inadequate means and there was no assurance that the inclination would be maintained constant. By use of the guiding formwork according to this invention it is possible to produce 3,399,438 Patented Sept. 3, 1968 the transverse girders are provided at their ends with a number of bores, which can be selected according to the desired distance between the two limbs. In view of the stresses to which the guiding device is subjected, it is advantageous to stiffen the outer limb, for instance wholly or partly with latticework or a solid wall construction. The lower part of the inner limb may also have a stiffening structure, the upper girders of which then form a supporting grating for a working platform. The shuttering plates are preferably stiffened on the outside by vertically extending girder sections. Through the webs of these girder sections tubes are passed in a horizontal direction, these tubes being uniformly adapted to the curvature of the shuttering plates and acting as a supplementary annular stiffening.

One embodiment of the invention is illustrated by way of example, in connection with the building of a concrete chimney, in the accompanying drawings, in which:

FIGURE 1 shows a guiding device in side elevation;

FIGURE 2 shows in plan a sector-shaped portion of a horizontally arranged grating;

FIGURE 3 shows a front view of the shuttering plate, with an indication of the position of the vertically extending stiffening girders and the horizontally extending tubular girders;

FIGURE 4 and 5 show horizontal sections through the shuttering plates, which indicate the arrangement of the structures with slightly inclined Wall surfaces withthe assurance that a definite inclination will be reliablymaintained. Such a possibility is particularly advantageous when concrete chimneys of great height are-to be built, and in which the slightest error in the adjustment of the inclination would be noticeable. r

The invention consists essentially in the feature that the members for guiding the shuttering plates are adjustably arranged at the margin of a horizontally sup ported disc or plate, that the guiding members consist of two stiffened parallel limbs, to the inner sides of which (facing one another) the shuttering plates are secured, these limbs being connected with one another by a trans- .verse girder, to which the lifting appliances are attached,

and that underneath the shuttering plates gliders or rollers guided by the concrete Wall are provided at the lower ends of the limbs. 1

In a preferred form of construction of the invention, for the building of chimneys, the horizontally supported plate is a circular disc, and the guiding members are radially adjustable relatively to the edge of this disc. The horizontally arranged disc, as regards its lateral position, is guided by the already hardened concrete beneath the shuttering skin.

It is particularly advantageous to construct the disc as a grating, wherein radially extending girders are provided which pass between the limbs of the guiding device. To enable the guiding devices to be radially adjusted relatively to the grating, there may be provided, between the grating and the limbs, an adjusting member in the nature of a turnbuckle, while on the other side, between the transverse girders of the limbs and the radially ex tending girders, guiding devices are provided.

The guiding device is preferably adjustable for a definite wall thickness. In order to provide this adjustability, for the purpose of changing the distance between the limbs,

vertical stiffening girders and the position of the horizontal tubular girders;

FIGURE 6 is a sectional view corresponding to the section line VIVI in FIGURE 5;

FIGURE 7 is a view on an enlarged scale of part of the device illustrated in FIGURE 1 for the production of the limbs; and

FIGURE 8 is a view corresponding to the section line VIIIVIII in FIGURE 7.

In the device illustrated in FIGURE 1, for the guidance of a slidable mold, use is made of hydraulic lifting appliances. The hydraulic lifting appliances illustrated may, however, be replaced by mechanical means. The apparatus as a whole is supported upon a ferro-concrete post 20, shown in cross-section and cast in local shuttering.

This post should be about 1.50 meters high. As a lifting appliance there is employed, in a known manner, a jack rod 21. At the upper part of the jack rod is shown a recovery tube 22. All these parts, however, are not directly connected with the invention, and may be replaced by other lifting devices. At the upper end of the pack rod there is a lifting device 9, which may be a hydraulically operated jack.

The actual guiding device consists of two parallel limbs 1a and 1b, which are connected with one another approximately centrally by a transverse girder 8. The limbs are connected the top by two parallel transverse girders 2a and 2b. The distance between the limbs 1a and 1b is determined by the thickness of the concrete wall to be produced. In order that the appliance may be adjustable to different thicknesses, a plurality of holes are provided in all the transverse girders 8, 2a, and 2b, so that the distance between the limbs 1a and 1b can be varied. The transverse girder 8, in this constructional example, serves as a yoke which is fixedly connected with the lifter 9.

In the upper part of the device there is a sector-shaped grating, comprising individual girders 10a which extend radially. Between each girder 10m and the associated transverse girder 2a is a sleeve 3, with right-handed and left-handed screw threads, in the manner of a turnbuckle, one end of the bolt of which is secured upon a transverse flange of the girder 10a, while the other end is secured to the transverse girder 2a. By rotating the turnbuckle 3 the relative positions of the girder 10a and the limbs 1a and 1b can accordingly be altered.

For thispurpose, between the flanges of the transverse girders 2a and 2b and the flanges of the girder a, rollers or similar devices (not shown) are mounted to facilitate sliding. In this constructional example the limb 1a is braced by a truss consisting of the girders 6a, 6b, 6c, 6d and 6e. Instead of this truss, a solid wall construction may of course in part be employed. On the other side, namely, at the lower part of the limb 1b, a truss 7a, 7b, 7c is likewise provided, which at the same time serves to support a working platform. At the lower ends of the limbs 1a and 1b there are rollers or gliders 4a and 4b, which are adjustable to a definite thickness of the wall 20 by means of set screws 5.

These rollers or gliders, as seen in FIGURE 1 extend to at least the vertical extent of the shuttering plates below the lower edge of the shuttering plates 12a and 12b so that the rollers or gliders contact the surfaces of the concrete so far below the shuttering plates that the concrete against which they bear is substantially hardened or, in common parlance, has taken its permanent set.

The construction of the horizontal grating will be apparent from FIGURE 2. This illustration shows that girders 10a, 10b and 100 are arranged radially. These radial girders are stiifened by transverse girders 11a and 11b. Some of the radial girders 10b extend right to a centrally arranged plate or disc 18.

The shuttering plates 12a and 12b, also shown in FIG- URE 1, are stiffened by vertical girders 13a, 14a and 15a. This arrangement of the stifiening girders will be apparent from FIGURE 3. For radial stiffening, horizontal lengths of tubing 16 and 17 are used, the arrangement of which, as seen from the front, is shown in FIGURE 3. The relation between the individual stiffening girders with the shuttering plates 12a and 12a will be apparent from FIGURES 4 and 5. The skin of the shuttering consists of laminated high sheet-iron plates, in which shuttering plates 12a are fixedly arranged and the intervening shuttering plates 12a are displaceably arranged. The shuttering plates 1211 are fixed to the yoke structure by bolts extending through channel bars 13a and 13b. The displaceable intervening shuttering plates have upper and lower bent-over edges, which are slipped on to the fixed plates 12a This arrangement will be apparent from FIG- URE '6. As already mentioned, tubes 16 and 17 are provided, which are passed through bores in the angles and girders. These tubes are so dimensioned that due to their resilience they can assume any curvature, so that, since all these tubes are of the same dimensions, a circular shape for-med by these tubes is obtained. In order that these tubes may not be hampered by the interlocking of the shuttering, they are staggered in height. This arrangement is also shown in FIGURE 6.

FIGURE 7 is a view on a larger scale of the upper portion of the apparatus shown in FIGURE 1 and shows 4 how the girder 10a is guided between the girders 2 1 and 2b formed as slideways by means of rollers 24.

FIGURE 8 shows a section through a girder 10a of the girder grating, which is guided upon the girders 2a and 2b which are constructed as slideways, and which are secured to the parallel limbs 1a and 1b. The taper,- that is, the obliquity of the limbs, is obtained by actuating the turnbuckle 3, while the rollers 4a and 4b are guided by the hardened concrete.

I claim:

1. A mold for making annular concrete walls of considerable height and of varying diameter comprising a plurality of pairs of limbs, each pair of limbs lying in a vertical plane, and parallel to the inner and the outer surface of the annular wall being molded, shuttering plates mounted on each of said limbs, the shuttering plate mounted on one of said limbs to face the shuttering plate mounted on the other said limb of said pairs, the shuttering plates supported by each said pair of limbs slidably overlapping the shutterin plates supported by adjacent pairs of limbs, means to raise all of said pairs of limbs simultaneously, said limbs each extending downwardly from the lower edge of said shuttering plates a distance equal to at least the vertical extent of said shuttering plates and glider means at the extreme lower ends of each said limb contacting the already substantially hardened concrete structure.

2. The mold of claim 1 in which said glider means are rollers.

3. The mold of claim 1 in which said limbs are in the form of trusses.

4. The mold of claim 1 in which the limbs of each pair of limbs are adjustable in the vertical plane in which they lie to adjust the slope of the concrete wall being molded.

5. The mold of claim 1 in which means is provided to assemble the said limbs at dilferent distances from each other so that walls of a selected thickness can be molded.

References Cited UNITED STATES PATENTS 949,521 2/ 1910 Collins. 1,127,369 2/1915 Nash. 1,891,160 12/1932 Jesperson 249-17 X 2,617,168 11/1952 Johnson 25-131 X 2,621,389 12/1952 Van Heidenstam et al. 25-131 3,252,199 5/ 1966 Bossner 249-20 X FOREIGN PATENTS 602,963 4/ 1934 Germany.

203,088 9/ 1923 Great Britain.

864,377 4/ 1961 Great Britain WILLIAM J. STEPHENSON, Primary Examiner.

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