NL1012857C2 - Jetty. - Google Patents

Description

SCAFFOLDING

The invention relates to a scaffold comprising a upright suitable for being erected substantially vertically from a surface, and a girder 5 suitable for connecting to at least a aforementioned upright via a coupling means.

In practice, various scaffolding is known, for example from a straight scaffolding running alongside a building, especially in new construction, to a complex extension scaffolding around an industrial installation. The group of scaffolding can be divided into pipe coupling scaffolding, system scaffolding and frame scaffolding.

The traditional jetty comprises 7 groups of parts: - long pipes, varying in length from approx. 2.5 to 4.5 m; - called short pipes, short-cuts or sleepers, varying in length from approx. 1.5 to 3 m; 15 - universal joints; - rotary joints; - planks; - welding couplings; - foot plates.

20 Advantages are great flexibility, cheap, relatively few parts.

Disadvantages are: heavy parts, long construction time, loose couplings, leveling of longitudinal beams, risk of falling loose parts and required dexterity during assembly and disassembly.

The system scaffolding includes: 25 - uprights with fixed coupling points in approx. 4 sizes ranging from 0.5 to 3 m; - sleepers in approx. 4 sizes ranging from 0.7 to 3 m; - diagonals in approx. 4 sizes; - planks; 30 - adjusting spindles.

Advantages are here: more connections (up to 8) per coupling point, all at one fixed height, simple coupling principle.

1012857 -2-

Disadvantages are: uprights are provided with fixed coupling points, so that flexibility is limited, limited stroke of 0.5 m, coupling points make uprights extra heavy, additional space required by coupling points during storage.

The frame scaffolding includes: 5 - more or less flatly extending tube frames, approx. 6 types in different heights and widths; - planks; - diagonals; - railings; 10 - adjusting spindles.

The number of frames required quickly rises to six. The frames usually have a limited width of 0.7 - 1 m, otherwise they can no longer be handled. In total, this scaffolding has at least 9 different constituent parts and it is not yet possible to assemble all types of scaffolding.

15 Advantages are: short construction time, relatively short lengths, so light parts, no loose couplings, relatively little adjustment work.

Disadvantages are: low flexibility, fixed tube lengths, fixed stroke approx. 0.5 m, relatively expensive, many protruding parts, many length couplings in connection with short lengths, non-correctable skew for damaged parts.

20 One of the problems in scaffolding is high absenteeism among scaffolders. It is believed that this is mainly due to (too) high demands placed on the musculoskeletal system of the scaffolder during scaffolding construction.

In view of all these objections, 25 people are increasingly opting for the use of an aerial work platform and scaffolding is mainly used for long-term projects and support works.

Solution directions that have already been taken are to reduce the weight of the scaffolding parts by replacing steel with aluminum and by reducing the piece length of the scaffolding tube from approx. 6m to approx. 4m. In practice, the choice for 30 aluminum turned out to be disappointing because of the level of the investment, greater vulnerability and increased risk of theft due to the higher market value.

1012857 -3-

For the lower scaffolding classes, a good and effective solution can be found in the existing frame scaffold by dimensioning. However, for heavier scaffolding classes where traditional scaffolding or system scaffolding is now used, there is a need for a more flexible scaffold with a high construction speed and to be built with light equipment.

The object which is now aimed at with the invention is to provide a scaffolding which has a great flexibility, is light in weight and more generally satisfactory in an ergonomic sense, quick to set up and dismantle and all this with a favorable price-quality ratio. After all, as cheap as the traditional scaffold is in terms of weight, construction speed and safety, it leaves a lot to be desired.

Improvements are achieved according to the invention in a first aspect if the scaffolding is characterized in that the coupling means comprises a clamping ring which can be removed from the upright or which can be fitted around it, as well as a clamping pivot therein which is rotatable for a substantially vertical axis during normal operation. clamping a first longitudinal beam which can be inserted through it, as well as connecting means for releasably connecting a second longitudinal beam to the clamping ring.

This achieves that the scaffold has a high degree of flexibility; the height at which the clamping ring is mounted can be freely chosen and the distance between the uprights in the longitudinal direction can be varied widely: if the uprights are close together, the longitudinal beam is, as it were, pushed through the clamp over a great distance and the longitudinal beam extends diagonally in the scaffolding. However, the uprights can also be spaced at any distance smaller than the length of the side member.

In a preferred embodiment the connecting means comprise a substantially annular thickened part on the clamping ring.

This makes it possible to achieve a simple coupling between a longitudinal beam and a clamping ring, whereby it is not critical in which radial direction the longitudinal beam extends exactly from the upright.

Preferably, the connecting means comprise a clamping jaw at or near one end of a longitudinal beam.

1012857 -4-

This achieves that a longitudinal beam with a clamping jaw grips around the annular thickened part of the clamping ring in order to fix it in the longitudinal direction.

In an embodiment in which the scaffolding also comprises a cross beam which is suitable for fixing a upright in the transverse direction and which is suitable for connecting via the coupling means to at least one upright, the scaffolding is characterized in that the coupling means comprises an adapter is to cooperate with the clamping ring on one side, and suitable for cooperating with a crossbeam on another end in which intermediate piece the clamp can be suspended.

The coupling means thus fulfills the coupling functions between the upright, the longitudinal beam and the cross beam, whereby the coupling with the upright is effected by wrapping the clamping ring around the upright, the coupling with a first longitudinal beam is effected via clamping jaw and clamping ring , the coupling to a second longitudinal beam is effected via a clamp through which the longitudinal beam is pushed through, which clamp is rotatable about an axis which is essentially vertically oriented in operating condition, and the coupling of said parts to a cross beam is realized via a intermediate piece that can be connected to the crossbar and is suitable for holding the rotatable clamp. The fixed part of the clamping ring and the intermediate piece can be made in one piece, for example as a casting.

It should be noted here that where reference is made in this application to longitudinal and transverse beams, this should also be understood to mean a transverse beam extending in a direction other than the indicated longitudinal or transverse direction. For example, according to the invention it is also possible to use a coupling described herein as a connection with a longitudinal beam as a connection with a cross beam or with a cross-beam providing diagonal beam.

In one embodiment, the clamp is movable in the spacer in the sense that it is also rotatable about a shaft extending substantially horizontally perpendicular to the longitudinal axis of the longitudinal beam during normal operation.

This achieves that the longitudinal beam can also be arranged inclined.

i u ï ö i -5-

In a further embodiment, the upright, cross and / or longitudinal beam are formed substantially from hollow tube with cross-sectional diameters measured to the outside, a largest dimension G, where G is greater than or equal to 50 mm and smaller or equal to 70 mm.

This ensures that the upright and the beams are easy to handle by hand.

In a further preferred embodiment, the scaffold is characterized in that the upright is a round tube with an outer diameter between 55 and 60 mm, more preferably about 57 mm.

According to the invention, the optimum of stiffness, strength and handling is at said 57 mm.

In a preferred embodiment where the tube is steel, it has a wall thickness between 1.4mm and 2.6mm, more preferably between 1.6mm and 2.0mm, and more preferably about 1.8 mm.

A post with a diameter of 57 mm with a wall thickness of about 1.8 mm and a length of about 4 meters weighs about 10 kg, which is considerably less than the almost 15 kg weighing an equally long post of the known scaffolding tube.

In yet another embodiment, the scaffold according to the invention is characterized in that the cross and / or the longitudinal girder is mainly formed of hollow tube with a substantially rectangular cross-section.

The cross and longitudinal beams are mainly loaded on bending in the vertical plane, and hardly on bending in the horizontal plane. Thus, provided the beams are properly positioned, it has advantages to differentiate the stiffness and strength on bending in the two mentioned planes and to provide a beam that is higher than wide in operating condition, effectively providing the same functionality in stiffness and strength, but at a lower weight is achieved.

Preferably, on the outwardly facing side, the tube has a transverse profile with rounded edges with a radius of curvature of at least 15 mm.

Such a tube can be grasped in a pleasant manner and is therefore also excellent in terms of ergonomics in addition to weight.

1012857 -6-

Preferably the uprights and / or the girders are provided with indelible reference distance markings.

This achieves that the clamping rings and clamps can be fastened in a desired location quickly and efficiently. The construction can be based on a reference plane that consists of, for example, leveled upright supports, from which the scaffold layers can be applied effectively and quickly at one height by using the spacer markings on the uprights by using the clamping rings on each upright in the same way. to be mounted with respect to corresponding distance markings.

The spacing markings are preferably formed by marked dented spots on the circumference of the uprights and / or the beams.

Because the tube, for example, has a slit-shaped and a round dent alternately at a distance of 125 mm, it is easy to transpose a measure on an upright or beam to an opposite or adjacent upright or beam during construction.

In the context of the present application, rights are also requested for a longitudinal beam on one side provided with an openable and closable clamping jaw, as well as for a clamping jaw with a fixed and a jaw movable about a pivot point, wherein the movable jaw is moved by moving a carrying member , for example, and preferably a wedge, is openable and closable, the entrainer acting on a portion of the movable jaw located on the side of the pivot facing away from the jaw, as well as for riser pipe provided with indelible distance markings, all per se and as shown and described herein.

This will now be further elucidated with reference to a drawing 25, in which:

Fig. 1 part of a scaffold according to the invention;

Fig. 2 a coupling means according to the invention;

Fig. 3 a stand according to the invention;

Fig. 4 a shortening according to the invention; FIG. 5 a coupling means according to the invention in bottom view;

Fig. 6 a side view of a coupling means according to the invention;

Fig. 7 shows a beam clamp according to the invention in top and side view.

1 012857 -7-

In FIG. 1 is 1 an upright on which clamping ring 4 rests. Clamping ring 4 is connected to intermediate piece 7 in which clamp 5 is suspended. This suspension is such that clamp 5 is rotatable about an axis vertically oriented during normal operation. Clamp 5 holds the longitudinal beam 3 passed through it in place. The intermediate piece 7 is provided with a projection (not shown) which protrudes into, connects to and is connected to cross beam 2. The scaffold on the side (not shown) of cross beam 2, for example, looks mirror-like, in which case The upright 1 is hollow round steel pipe with a diameter of about 57 mm and beams 2 and 3 are made of hollow steel pipe with a flattened cross section, for example preferably 60 mm high, 30 10 mm wide and rounded at the top and bottom with a radius of curvature of 15 mm.

In FIG. 2, a coupling according to the invention between upright 1, cross beam 2 and longitudinal beam 3 is shown in detail. The various connections between the upright and the beams are secured by means of wedges 8. Upright 1 and clamping ring 15 are clamped coupled in that a hinged clamping ring part is wrapped around the upright 1 and is tightened against a fixed clamping ring part, whereby the upright 1 is clamped in the clamping ring 4 by driving wedge 8 which protrudes through the hinged and the fixed clamping ring part sticking bolt. Upright 1 and longitudinal beam 3 are clamped together by placing clamping jaw 6 with the upper jaw over the edge of the clamping ring 4 and closing the hinged lower jaw against the bottom of the clamping ring, which is effected by a wedge 8 which is attached to the jaw the opposite side of the hinge extends through the upper jaw and cooperates with the lower jaw to drive into the clamping jaw 6. Cross beam 2 and longitudinal beam 3 are clamped coupled by driving a wedge 8 between clamp 5 and a clamping member operating in clamp 5 suspended on the longitudinal beam 3.

In FIG. 3, a part of a steel upright 1 is shown provided with spacing markings 9 and 10, applied to a pitch of, for example, 125 mm in the form of round or slotted indentations 9, 10, respectively. These markings 9, 10 which can also be applied to the beams 30 make fitting and measuring easier, making assembly easier. The steel upright 1 preferably has a length of maximum 4 meters, an outer diameter of approximately 57 mm and an inner diameter of approximately 53.4 mm.

In FIG. 4, crossbar 2, also referred to as shortening 2, is shown in an embodiment according to the invention in which a coupling comprising clamping ring 5 and intermediate piece 7 with rotatable clamp 5 projects into and is connected to crossbar 2. Bolt 11 is provided with an opening for piercing a wedge 8 for enclosing the movable part 14 of clamping ring 4. Furthermore, a stop 12 is shown for securing gangways which can be placed over the bricks 2 laterally against sliding.

In FIG. 5, 13 denotes a part of the coupling which can be inserted and fitted in the shortening 2, which is essentially hollow tube. It can be clearly seen how the movable part 14 of the clamping ring can be folded around a post and clamped by striking a wedge through the opening in bolt 11.

In FIG. 6, the suspension of clamp 5 in the intermediate piece 7 is indicated. The coupling can be inserted into a cross beam 2 with part 13 and be connected thereto.

In FIG. 7, the clamping jaw 6 is shown in more detail in top, side and side view. The clamping jaw has an upper jaw 15 and a projection 14 with which it can be attached to a beam, for example a longitudinal beam 3. To close the jaw, the lower jaw 16 is brought to the upper jaw 15 by rotation about hinge 18, in the embodiment shown by inserting a wedge (not shown) through opening 17 from top to bottom, such that the active wedge surface forces the lower jaw 16 to close. .

1012857

Claims (20)

Scaffold comprising a upright (1) suitable for erecting substantially vertically from a surface, at least two longitudinal beams (3) suitable for fixing the upright (1) in the longitudinal direction and suitable for coupling to the upright via a coupling means ( 1), characterized in that the coupling means comprises a clamping ring (4) which can be removed from the upright (1) and which can be fitted around a shaft (5) which can rotate substantially vertically during normal operation. for clamping a first longitudinal beam (3) which can be inserted through it, as well as connecting means (6) for detachably connecting a second longitudinal beam (3) to the clamping ring (4). Scaffold according to claim 1, characterized in that the connecting means (6) comprise a substantially annular thickened part on the clamping ring (4). Scaffolding according to claim 1 or 2, characterized in that the connecting means (6) comprise a clamping jaw at or near one end of a longitudinal beam (3). Scaffold according to one of the preceding claims, also comprising a cross beam (2) suitable for fixing the upright (1) in the transverse direction and suitable for connecting via the coupling means to a second upright (1), characterized in that the coupling means an intermediate piece (7) which is suitable for co-operating on one side with the clamping ring (4) and which is suitable for co-operating on another side (13) with the cross beam (2), in which intermediate piece (7 ) the clamp (5) can be suspended. Scaffold according to any one of the preceding claims, characterized in that the clamp (5) is movable in the intermediate piece (7) in the sense that it is also rotatable about a substantially horizontally oriented perpendicular to the longitudinal axis of normal operation. the longitudinal beam (3) running shaft. 1012857 -10- Scaffolding according to any one of the preceding claims, characterized in that the upright (1), the cross and / or the longitudinal girder (2,3) are mainly formed of hollow tube with a cross-section, diametrically to the outside measured, a largest dimension G, where G is greater than or equal to 50 mm and 5 is less than or equal to 70 mm. Scaffold according to claim 6, characterized in that the upright (1) is formed from a round hollow tube with a diameter between 55 and 60 mm. Scaffold according to claim 7, characterized in that the diameter is about 57 mm. Scaffold according to any one of claims 6-8, characterized in that the tube is made of steel and that the tube has a wall thickness between 1.4 and 2.6 mm. 15 Scaffold according to claim 9, characterized in that the tube has a wall thickness between 1.6 and 2.0 mm. 11. Scaffold according to claim 10, characterized in that the tube is made of steel and that the tube has a wall thickness of approximately 1.8 mm. Scaffolding according to any one of the preceding claims, characterized in that the cross and / or the longitudinal girder (2,3) are substantially formed of hollow tube of substantially rectangular cross section. 25 Scaffolding according to claim 12, characterized in that the tube on the outwardly facing side has a cross section with roundings with a rounding radius of at least 15 mm. Scaffolding according to claim 12 or 13, characterized in that the cross and / or the longitudinal girder (2,3) are essentially formed of hollow tube with a cross-section measured in diameter 1012857-11, measured diametrically to the outside, a smallest dimension K, where K is greater than or equal to 30 mm. Scaffold according to one of the preceding claims, characterized in that the uprights (1) and / or the girders (2,3) are provided with indelible reference distance markings (9,10). Scaffolding according to one of the preceding claims, characterized in that the spacing markings (9,10) are formed by dented spots (9,10) on the circumference of the uprights (1) and / or the beams (2,3). ). 17. Longitudinal beam (3) on one side with an open and closable clamping jaw (15,16,18). 18. Clamping jaw (15, 16, 18) provided with a section (14) suitable for connection to a longitudinal beam (3). Longitudinal beam (3) mainly consisting of a hollow tube with a clamping jaw (15,16,18) connected thereto, the clamping jaw being inserted into tube 20 with a part (14) and connected to the tube via that part (14) is. Scaffolding comprising uprights (1) and / or beams, characterized in that the uprights (1) and / or the beams (2,3) are provided with indelible reference distance markings (9,10). 1012857