Point-loaded lifting fork for lifting standing formwork panels

Description

[0002] Field of the invention:

[0003]

[0004]

[0001] The present invention relates to a point-loaded lifting fork for lifting standing formwork panels.

[0005]

[0006] Background

[0007]

[0002] When erecting modern buildings and structures made of concrete or with a concrete foundation, formwork and formwork systems are currently used. Traditional steel formwork systems are not very user-friendly, mainly due to their heavy weight and unwieldy size. For the same reason, virtually all assembly is carried out by crane. Formwork equipment spread over an unnecessarily large area on a construction site is a sign of poor storage routine. Clutter on the construction site makes it difficult to keep track of equipment, and the first impression of the construction site is then poor.

[0008]

[0009]

[0003] A disadvantage of crane transport in connection with formwork assembly is, among other things, that the parts are lifted / shipped as small packages, most often with only one leaf size at a time. On the construction site, formwork leaves are often transported over long distances. Transporting formwork in small units by crane over long distances takes time, and often has to be done at the expense of other work. Lack of crane capacity on a construction site can soon mean reduced progress and hence greater costs. Transport of formwork constitutes a significant cost, externally in that formwork is often transported over long distances to and from the construction site and internally at the construction site in that formwork equipment is transported in small packages by crane in connection with intermediate storage, assembly, demolition, loading onto a truck, etc.

[0010]

[0011]

[0004] Norwegian patents 321441 and 337204 describe a pallet system for transporting standing formwork members for transporting formwork assemblies on pallets and a method for lifting such a pallet via a strap which in turn has two or more attachment points to the standing formwork members. This leads to manual work to attach the strap arrangement to the standing formwork members and it is demanding to move one by one the formwork members. However, attaching a lifting strap to standing members is not a good solution due to the great height. Picking up and dropping off members in a work cycle will soon constitute a significant working time for a work team.

[0012]

[0013]

[0005] A solution according to the present invention will enable a completely new, safer, faster and simpler transport of formwork panels from a pallet to the intended location than with known systems, b1.a. by the fact that panels can be transported from a standing position on a pallet, and lifted and transported by crane, car and forklift without complicated fastening systems. Standing panels can make better use of a storage space, in addition to the fact that standing panels can then be made more complete with associated scaffolding floors, scaffolding brackets, framework for corner panels. With formwork panels that have scaffolding floors permanently attached to all main panels, a formwork system with fewer parts is achieved and which can then be built and demolished much faster. With one scaffolding floor and two scaffolding brackets per panel, this represents a significant volume saving regarding storage, shipping and assembly, wastage and maintenance.

[0014]

[0015]

[0006] There is therefore a need for a lifting fork that can be quickly maneuvered to a standing member's recessed lifting point and securely attached to a pallet with standing formwork members. As well as formwork members with a scaffolding floor permanently attached to the framework.

[0016]

[0017]

[0007] However, with a point-loaded lifting fork according to the invention described here, the above-described disadvantages and limitations are avoided, and further advantages are achieved with the invention as described with the features stated below and in the patent claims.

[0018]

[0019] Summary

[0020]

[0008] The present invention provides a device for lifting formwork members, wherein the device comprises an elongated horizontal member comprising a first and second end and at least a first and a second attachment point for attaching a lifting device, wherein the horizontal member at its first end comprises a weight element and a vertical element provided at the second end of the horizontal member, wherein the vertical element comprises an upper and lower end and is projecting downwards from the horizontal member and a hook body provided at the lower end of the vertical element, wherein the hook body projects towards the first end of the horizontal member a distance such that an attachment point on the hook body is on a vertical line with a lifting device which is centred between the first and second attachment points.

[0021]

[0022]

[0009] In one embodiment of the invention, the lifting device is a strap, a rope, a metal wire or other suitable elongated bodies for lifting which is attached at one end to a device for providing lift.

[0023]

[0024]

[0010] In a further embodiment, the device for providing lift is a hoisting crane, lifting crane, crane truck or winch.

[0025]

[0026]

[0011] In a further embodiment, the lifting device is divided at its lower end towards the lifting fork into a first and second part and wherein the elongated horizontal element comprises a first and second attachment point for attachment to the first and second part, respectively, of the lifting device.

[0027]

[0028]

[0012] In a further embodiment, the weight element is movable and attachable along the length of the horizontal element to change the center of gravity of the lifting fork.

[0029]

[0030]

[0013] The second aspect of the invention relates to a system for lifting a standing formwork leaf using a point-loaded lifting fork according to any embodiment of the invention, wherein a standing formwork leaf comprises a centered vertically positioned V-pad which is a channel profile, and wherein the channel profile comprises a recess which is adapted to the attachment point of the lifting fork on the hook body.

[0031]

[0032]

[0014] In an embodiment of the second aspect, the invention relates to a formwork shutter which further comprises a scaffolding system, wherein the scaffolding system comprises scaffolding flooring mounted on the upper part of the shutter, railing supports are attached to a pivotable holder recessed in a V-pad on the shutter, the pivotable holder is rotated about an attachment point so that the holder is pivotable into an upright position.

[0033]

[0034]

[0015] In a further embodiment of the second aspect, the scaffolding system of the invention further comprises horizontal railing elements attached to at least one railing support.

[0035]

[0036]

[0016] In a further embodiment of the second aspect, the invention relates to at least one horizontal extension profile incorporated in at least one railing element for adapting the width of the railing.

[0037]

[0038] Brief description of the figures

[0039]

[0017] For a better understanding of the invention, a set of figures is provided. Like numerals on different figures describe the same feature.

[0040]

[0041] Fig. 1 shows a standing limb on a pallet.

[0042] Fig. 2 shows the formwork framework

[0043] Fig. 3 shows the formwork's lifting fork.

[0044] Fig. 4 shows a standing limb being lifted from a pallet in a vertical position.

[0045] Fig. 5 shows the lifting fork attached to a formwork member

[0046] Fig. 6 shows the lifting fork inserted from the side into a limb

[0047] Fig. 7 shows a section of formwork with a two-part scaffold floor on top of the formwork.

[0048] Fig. 8 shows a formwork with two-part scaffolding seen from above.

[0049] Fig. 9 shows a three module long railing with two supports spaced two modules apart.

[0050] Fig. 10 shows a three-module long railing.

[0051]

[0052]

[0018] Figure 1 shows the main formwork leaf 1 called H-leaf. The H-leaf 1 has locking profiles 2 with tie holes and recessed leaf locks at a distance of one module, two modules and one module, respectively, measured from the top. An H-leaf 1 is three modules wide. Vertical beams in the form of vertical V-pads 3 have a distance of one module continuously. Scaffolding floor 8 has the same width and length as an H-leaf and is permanently attached to all leaf sizes. In order to provide easy lifting of an H-leaf 1, there is a box-shaped V-pad 4 centered on the wide side of the H-leaf 1 which has a channel profile comprising a recessed opening 5 for the insertion of a lifting fork 9.

[0053]

[0019] Fig. 2 shows two H-limbs 1 connected together by a removable horizontal H-pad 6 spanning three vertical V-pads 3 and a limb joint 7. The H-pad 6 reduces the number of stay rows in addition to eliminating the use of a centered stay hole row in large H-limbs 1.

[0054]

[0055]

[0020] Figure 3 shows the formwork lifting fork 9. The lifting fork 9 consists of an elongated horizontal element 10 attached to a lifting strap 11 at a first and a second attachment point 12a, 12b. The lifting strap 11 is divided at its lower end towards the lifting fork into a first and second end 13a, 13b for attachment to the first and second attachment points 12a, 12b, respectively, on the lifting fork 9.

[0056]

[0057]

[0021] The horizontal element 10 comprises a first and a second end, where at its first end it comprises a weight element 14 and at its second end it comprises a vertical element 15 projecting down from the horizontal element 10. At the lower end of the vertical element there is provided a hook body 16 which projects towards the first end of the horizontal element 10 at a distance such that an attachment point on the hook body is on a vertical line 23 with the lifting strap 11 which is centred between the first and second attachment points 12a, 12b. The lifting strap 11 may be a strap, a rope, a metal wire or other suitable elongated bodies suitable for lifting.

[0058]

[0059]

[0022] In order for the lifting fork 9 to be balanced approximately level both with and without a load on the attached limb, so that the attachment point 17 is on a vertical line 23 with the lifting strap 11 and the moment from the weight element 14 is equal to the moment created by the vertical element 15 and the hook body 16. To achieve this, the horizontal distance from the center between the first and second attachment points 12a, 12b to the center of mass of the weight element 14 multiplied by the weight of the weight element 14 must be equal to the distance from the center between the first and second attachment points 12a, 12b to the center of mass of the vertical element 15 and the hook body 16 multiplied by the weight of the vertical element 15 and the hook body 16, given that the horizontal element 10 is in equilibrium around the lifting strap 11. In one embodiment of the invention, the horizontal element 10 is shorter than the vertical element 15 from the line of attack of the lifting strap than towards the weight element 14. In such an embodiment, the remaining elements must compensate for the decreasing moment from one side.This way, the lifting fork 9 will always be in the correct position.

[0060]

[0061]

[0023] A standing H-limb that stands on a pallet with other H-limbs will be hooked onto the attachment point 17 on the hook body 16 in the limb's recess 5 so that any weight becomes a point load acting in the same vertical line 23 as the lifting strap.

[0062]

[0063]

[0024] Figure 4 shows a pallet with standing H-legs 1 seen from the side. Hanging

[0064] leaf 1 is lifted into a vertical position with the point-loaded lifting fork 9 in the leaf

[0065] 1 center of gravity which is on the back of the V-pad 4. With a channel-shaped V-pad 4 and a cord or strap 11 attached to the lifting fork 9, a limb can then be quickly placed on and relieved of a lifting fork 9. The use of the lifting fork 9 is a prerequisite for

[0066] limbs may have fixed scaffold floors 8.

[0067]

[0025] A point-loaded lifting fork 9 compared to conventional rope suspension in connection with loading and assembly of hanging limbs will achieve that a hanging limb is held in the correct position even if the weight distribution of the limb is changed by attached loose parts. The lifting point 17 of the hook body is attached in a recess 5 in the centered V-pad 4 of the limb 1 which is a channel profile that will simplify the removal and attachment of a limb to the lifting fork.

[0068]

[0069]

[0026] Figure 5 shows the lifting fork 9 attached to a formwork leaf of the main leaf type 1, where the hook body 16 of the lifting fork 9 passes through the recess 5. A counter-holding peg 25 is attached to the pad 4 and is adapted to receive the lifting point 17 in that the counter-holding peg 25 and the lifting point 17 comprise corresponding contact surfaces when brought together. Said corresponding contact surfaces are connected to each other during lifting in a manner that creates an adhesion, for example in that the lifting point 17 comprises a positively shaped surface and the counter-holding peg 25 comprises a surface with a negative shape of the surface of the lifting point 17. The lifting fork 9 comprises in one embodiment a control strap 26 provided on the lifting fork 9 through an attachment point placed on the vertical element 15. With the control strap 26, the rotation of the lifting fork 9 about the vertical line 23 is controlled from the ground and is an important means for rapid supply and retrieval of individual members standing on a pallet.

[0070] The lashing strap 26 comprises at the opposite end from where it is attached to the lifting fork 9 a free end which a user can use to manipulate the position of the lifting fork 9 from the ground.

[0071]

[0072]

[0027] Figure 6 shows an H-leaf 1 where the lifting fork 9 is inserted from the side of the leaf 1. Such an application of the lifting fork 9 is advantageous, for example, when a damaged leaf 1 between two or more leaves on a pallet with standing leaves is to be removed or inserted.

[0073]

[0074]

[0028] In order for a lifting fork 9 as described here to be used on a formwork member with scaffolding, it is advantageous that a formwork member with a fixed scaffolding floor 8 is provided. Figure 7 shows a section of formwork with a two-part scaffolding floor 8, i.e. two opposing formwork members 1 have had their scaffolding floor 8 mounted on their upper tops with fixed fasteners. Scaffolding floor 8 is adapted to the width and thickness of a member and is permanently attached to all main members 1. Railing supports 18 are attached to a pivotable holder 19 recessed in V-pad 3 adapted to receive a railing support 1. The pivotable holder 19 is rotatable about a mounting point 20 so that the holder 19 pivots into an upright position when not in use, so that the holder 19 does not protrude beyond the edge of the scaffolding floor 8. The attachment point 20 may be a continuously supported bolt, either on one or two sides through a hole in the holder 19. On the inside of the formwork, the formwork plates 24 are illustrated.Formwork with two-part scaffolding 8 enables a good working position for an operator who then stands directly above the casting form. Such a two-part formwork prevents the framework from being soiled by concrete and contributes to a more comfortable working position for receiving concrete.

[0075]

[0076]

[0029] Figure 8 shows a formwork system with a two-part scaffold floor 8 seen from above. With a two-part scaffold floor from corner to corner inside, it simplifies passage (without costs / extra equipment) from one wall length to another, in addition to the fact that this scaffold then has an entrance without a fence in each corner.

[0077]

[0078]

[0030] Figure 9 shows a three-module structure where railing elements 21 are attached to two railing supports 18 at a distance of two modules. Figure 10 shows a three-module structure

[0079] long railing with railing elements 21 each with extension profiles 22 to adapt railings of obsolete limb sizes.

[0080]

[0081]

[0031] A system as described herein will enable a very simple railing by, among other things, the holder 19 for the support 18 being recessed into the V-pad 3 of the formwork.

[0082] Such formwork with built-in scaffolding and railings allows an operator to

[0083] has a foot on both wall sides during filling of the mold provided by the formwork. Such an invention also enables a formwork system

[0084] without loose scaffolding jacks and loose scaffolding floors, and which takes up less space and is far easier to move and build than ordinary known solutions. Scaffolding floors

[0085] without jacks simplifies both storage and handling of everything

[0086] formwork material.

[0087]

[0088]

[0032] Although specific embodiments of the invention have been described and illustrated herein, it is recognized that modifications and variations may readily occur to those skilled in the art, and accordingly, it is intended that the claims be interpreted to cover such modifications and equivalents.

[0089]

[0033] Reference numbers:

[0090] 1 Main limb, H-limb

[0091] 2 Limb lock

[0092] 3 V cushion, vertical beam

[0093] 4 Box-shaped V pillow, vertical

[0094] 5 Recess for lifting fork in box-shaped V pad 6 Demountable horizontal H pad

[0095] 7 Limb joint, joint between two main limbs 8 Scaffolding floor

[0096] 9 Forklift

[0097] 10 Elongated horizontal body

[0098] 11 Lifting strap

[0099] 12a, 12b First and second attachment points on the horizontal body 13a, 13b First and second end part of the lifting strap 14 Weight element

[0100] 15 Vertical element

[0101] 16 Hook part

[0102] 17 Attachment point of hook part

[0103] 18 Railing support

[0104] 19 Railing holder

[0105] 20 Rotation point, fastener

[0106] 21 Railing element

[0107] 22 Pull-out profiles

[0108] 23 Vertical line

[0109] 24 Formwork board

[0110] 25 Counterweight

[0111] 26 Steering strap

Claims

Claim 1. Point-loaded lifting fork (9) for lifting formwork members (1), comprising;- an elongated horizontal element (10) comprising a first and a second end and at least a first and a second attachment point (12a, 12b) for attaching a lifting device, wherein the horizontal element (10) at its first end comprises a weight element (14), and;- a vertical element (15) provided at the second end of the horizontal element (10), wherein the vertical element (15) comprises an upper and lower end and is projecting downwards from the horizontal element (10), and;- a hook body (16) provided at the lower end of the vertical element (15), wherein the hook body (16) projects towards the first end of the horizontal element (10) a distance such that an attachment point (17) on the hook body (16) is on a vertical line (23) with a lifting device (11) which is centred between the first and second attachment points (12a, 12b).2.Point-loaded lifting fork according to claim 1, wherein the lifting device (11) is a strap, a rope, a metal wire or other suitable elongated bodies for lifting which is attached at one end to a device for providing lift.

3. Point-loaded lifting fork according to claim 2, wherein the device for providing lift is a hoisting crane, lifting crane, crane truck or winch.

4. Point-loaded lifting fork according to one of the preceding claims, wherein the lifting device (11) is at its lower end towards the lifting fork divided into a first and second part (13a, 13b), and wherein the elongated horizontal element (10) comprises a first and second attachment point (12a, 12b) for attachment to the first and second part (13a, 13b), respectively, of the lifting device (11).

5. Point-loaded lifting fork according to one of the preceding claims, wherein the weight element (14) is movable and attachable along the length of the horizontal element (10) to change the center of gravity of the lifting fork (9).6.System for lifting a standing formwork leaf (1) using a point-loaded lifting fork (9) according to any one of claims 1-5, wherein a standing formwork leaf (1) comprises a centered vertically positioned V-pad (4) which is a channel profile, and wherein the channel profile comprises a recess (5) which is adapted to the attachment point (17) of the lifting fork on the hook body (16).

7. System according to claim 6, wherein the formwork leaf further comprises a scaffolding system, wherein the scaffolding system comprises: - scaffolding floor (8) mounted on the upper part of the leaf (1); - railing supports (18) are attached to a pivotable holder (19) recessed in the V-pad (3) on the leaf (1), the pivotable holder (19) is rotated about a fastening point (17) so that the holder (19) is pivotable into an upright position.

8. The system of claim 7, wherein the scaffolding system further comprises horizontal railing elements (21) attached to at least one railing post (18). 9.System according to claim 8, wherein the scaffolding system further comprises at least one horizontal extension profile (22) incorporated in at least one railing element (21) for adapting the width of the railing.