Formwork panel, formwork system and method for mounting a tie rod

Abstract

The disclosure relates to a formwork panel comprising: a formwork panel member having a front side for delimiting a space to be filled with concrete, a back side opposite the front side and a through-opening extending from the front side to the back side for allowing passage of a tie rod therethrough, the through-opening having a first cross-sectional area; an adjustment member extending across the through-opening of the formwork panel member, the adjustment member having a through-hole with a second cross-sectional area smaller than the first cross-sectional area of the through-opening of the formwork panel member, the through-hole being moveable relative to the front side of the formwork panel member. Furthermore, the disclosure relates to a formwork system and a method using such formwork panel.

Claims

1. A formwork panel comprising: a formwork panel member having a front side for delimiting a space to be filled with concrete, a back side opposite the front side and a through-opening extending from the front side to the back side for allowing passage of a tie rod therethrough, the through-opening having a first cross-sectional area; wherein an adjustment member extending across the through-opening of the formwork panel member, the adjustment member having a through-hole with a second cross-sectional area smaller than the first cross-sectional area of the through-opening of the formwork panel member, the through-hole being moveable relative to the front side of the formwork panel member, the through-hole being displaceable in a direction lying in the main plane of the formwork panel member, and the through-hole of the adjustment member is moveable in all directions parallel to the front side of the formwork panel member, the adjustment member having a disc element with the through-hole formed therein, wherein the disc element has a third cross-sectional area larger than the first cross-sectional area of the formwork panel member, the disc element being slidably arranged at the front side or back side of the formwork panel member.

2. The formwork panel according to claim 1, wherein a fastening device with a fastening element for securing the adjustment member at a given position of the through-hole with respect to the formwork panel member.

3. The formwork panel according to claim 2, wherein the fastening element is a wedge or a leaf spring.

4. The formwork panel according to claim 3, wherein the fastening element, in a state of the adjustment member demounted from the formwork panel member, is undetachably, but linearly moveably and tiltably connected to the disc element.

5. The formwork panel according to claim 1, wherein the disc element has a first disc and a second disc, the first disc being rotatably arranged in the through-opening of the formwork panel member, the second disc being rotatably arranged in a receiving opening of the first disc, the second disc having the through-hole for passing the tie rod therethrough.

6. The formwork panel according to claim 5, wherein the receiving opening is eccentrically arranged at the first disc and/or that the through-hole is eccentrically arranged at the second disc.

7. The formwork panel according to claim 6, wherein the disc element has a third disc fixed to the first disc and securing the second disc to the first disc.

8. The formwork panel according to claim 7, wherein a lock, for securing the disc element to the formwork panel member.

9. The formwork panel according to claim 8, wherein the second disc is tiltable with respect to the first disc.

10. The formwork panel according to claim 9, wherein the second disc, at its back side, has a spherical indentation and, at its front side, has a spherical surface, the adjustment member having a first edge for a linear contact with the spherical indentation of the second disc, the adjustment member having a second edge for a linear contact with the spherical surface of the second disc, the spherical indentation and the spherical surface of the second disc having the same center point.

11. A formwork system comprising: a formwork panel according to claim 10; a tie rod projecting through the through-hole of the adjustment member.

12. A formwork panel comprising: a formwork panel member having a front side for delimiting a space to be filled with concrete, a back side opposite the front side and a through-opening extending from the front side to the back side for allowing passage of a tie rod) therethrough, the through-opening having a first cross-sectional area; wherein an adjustment member extending across the through-opening of the formwork panel member, the adjustment member having a through-hole with a second cross-sectional area smaller than the first cross-sectional area of the through-opening of the formwork panel member, the through-hole being moveable relative to the front side of the formwork panel member, the through-hole being displaceable in a direction lying in the main plane of the formwork panel member, and the through-hole of the adjustment member is moveable in all directions parallel to the front side of the formwork panel member, the adjustment member has a disc element with the through-hole formed therein, wherein the disc element has a first disc and a second disc, the first disc being rotatably arranged in the through-opening of the formwork panel member, the second disc being rotatably arranged in a receiving opening of the first disc, the second disc having the through-hole for passing the tie rod therethrough.

Description

BRIEF DESCRIPTION OF FIGURES

(1) The invention will be further explained with respect to exemplary embodiments shown in the drawings.

(2) FIGS. 1 to 3 show a formwork system having two opposed formwork panels arranged in horizontal distance to one another to define a pouring space to be filled with concrete, a number of tie rods connecting the two formwork panels as well as an arrangement of reinforcement bars inside the pouring space between the formwork panels.

(3) FIGS. 4A to 4C schematically illustrate a number of situations in which the tie rod would collide with one of the reinforcement bars placed between the formwork panel members, requiring a displacement of the tie rod to avoid such collision.

(4) FIG. 5A and FIG. 5B show a first embodiment of an adjustment member to be arranged in a through-opening of one of the formwork panel members.

(5) FIG. 6 shows the adjustment member of FIGS. 5A, 5B in a state mounted to the through-opening of the formwork panel member.

(6) FIG. 7 is a sectional view along lines VII-VII in FIG. 6.

(7) FIGS. 8A to 8C is a sequence of sectional views illustrating the mounting of the adjustment member of FIG. 5a to FIG. 7 at the through-opening of the formwork panel member.

(8) FIGS. 9A, 9B show a second embodiment of an adjustment member to be arranged in the through-opening of the formwork panel member.

(9) FIG. 10 shows the adjustment member of FIGS. 9A, 9B in a state mounted to the through-opening of the formwork panel member.

(10) FIG. 11 is a sectional view along lines XI-XI in FIG. 10.

(11) FIGS. 12A to 12C is a sequence of sectional views illustrating the mounting of the adjustment member of FIGS. 9A, 9B, 10 and 11 at the through-opening of the formwork panel member.

(12) FIGS. 13A, 13B show a third embodiment of an adjustment member to be arranged in the through-opening of the formwork panel member.

(13) FIG. 14 shows the adjustment member of FIGS. 9A, 9B in a state mounted to the through-opening of the formwork panel member.

(14) FIG. 15 is a sectional view along lines XV-XV in FIG. 14.

(15) FIG. 16 is an exploded view of the adjustment member of FIGS. 14, 15.

(16) FIGS. 17A to 17C is a sequence of views illustrating the mounting of the adjustment member of FIGS. 13A, 13B, 14 and 15 at the through-opening of the formwork panel member.

(17) FIGS. 18A to 18E show the adjustment member of FIGS. 13A to 17C in different states adjusted to the arrangement of the tie rod.

(18) FIGS. 19 to 22 show a fourth embodiment of the adjustment member in a state mounted to the through-opening of the formwork panel member.

(19) FIG. 23 and FIG. 24 show a fifth embodiment of the adjustment member in a state mounted to the through-opening of the formwork panel member.

DETAILED DESCRIPTION

(20) FIGS. 1 to 3 show a formwork system 1 with two formwork panels 2 arranged in a horizontal distance from one another to define a space 3 to be filled with concrete for forming a wall element. The two formwork panels 2 are connected by means of tie rods (or anchor rods) 4 which are passed transversely to the formwork panels 2 through the space 3. Inside the pouring space 3, a plurality of steel reinforcement bars 5 are placed. Both vertical and horizontal reinforcement bars 5 may be used. Particularly in the construction of high-rise buildings, reinforcements 5 are densely packed in pouring space 3.

(21) FIGS. 4A to 4C illustrate that the tie rod 4 may collide with one of reinforcements 5 if restricted to a specific position. To avoid this problem, the tie rod 4 may be displaced sideward (i.e. horizontally), as shown in FIG. 4A; or upwards or downwards (see FIG. 4B); or a combination thereof (see FIG. 4C).

(22) To allow such repositioning of the tie rod 4, formwork system 1 comprises at least one adjustment member 6 connected to at least one of the formwork panels 2. In the shown example, the formwork panel 2 has a formwork panel member 7 with a planar front side 8 facing the pouring space 3 to be filled with concrete, a planar back side 9 opposite the front side 8 and beams 10 projecting backwards from back side 9 of formwork panel member 7. A through-opening 11 extends from the front side to the back side for allowing passage of the tie rod 4 therethrough. In the shown embodiment, the through-opening 11 is circular with a first diameter, which may be at least 50 mm, preferably at least 70 mm, more preferably at least 90 mm, in particular at least 100 mm.

(23) In a state mounted to the formwork panel member 7, the adjustment member 6 extends across the first diameter of through-opening 11 of formwork panel member 7. Adjustment member 6 has a circular through-hole 12 extending from the front side 8 to the back side 9 of the formwork panel member 7. In the shown embodiment, the through-hole 12 is circular with a second diameter which is smaller than the first diameter of the through-opening 11 of the formwork panel member 7. For adjusting the position of the through-hole 12 to the desired position of the tie rod 4, the through-hole 12 is moveable relative to the formwork panel member 7. In the shown example, the through-hole 12 is moveable in all directions so that the tie rod 4 between the two opposed formwork panel members 7 may be displaced and/or tilted sideward, upward/downward or any combination thereof. In the shown embodiment, the through-hole 12 may be displaced by more than 20 mm, preferably by more than 25 mm, more preferably by at least 30 mm, in all directions with respect to a central position of the through-hole 12 inside the through-opening 11 of the formwork panel member 7. Thus, in total the through-hole 12 is moveable by at least 40 mm horizontally and vertically.

(24) In the embodiment shown in FIGS. 5A, 5B, 6, and 7, the adjustment member 6 has a disc element 13 with the through-hole 12 arranged centrally therein. Thus, the disc element 13 covers the through-opening 11 of the formwork panel member 7 except for the through-hole 12 of the disc element 13. The disc element 13 has a third diameter larger than the first diameter of the through-opening 11 of the formwork panel member 7 so that the disc element 13 is slidably arranged at the front side 8 of the formwork panel member 7. For keeping the disc element 13 in tight contact with the front side 8 of the formwork panel member 7, a fastening device 14 with a fastening element 15 is arranged at the back side 9 of the formwork panel member 7. The fastening element 15 is arranged for securing the adjustment member 6 at any position of the through-hole 12 with respect to the formwork panel member 7. The fastening element 15 is connected to the disc element 13 and with this connection the movement of the adjustment member 6 is limited to ensure that the through-opening 11 remains closed at all times to avoid leaking of concrete and an inadvertent detachment of the adjustment member 6. In the shown example, the fastening element 15 is a leaf spring 16 with two leaf spring arms 17 each pressed against the back side 9 of the formwork panel member 7. The fastening device 14 has a support plate 18 for supporting a support section 19 of the leaf spring 16 thereon. The support section 19 of the leaf spring 16 has a plurality of pairs of openings 20 spaced in a longitudinal direction of the leaf spring 16 and aligned with corresponding openings of the support plate 18. Adjustment screws 21 are passed through one of the plurality of pairs of openings 20 and connected to the support plate 18. Thus, the spring force may be adjusted by relocating one of the pairs of the adjustment screws 21 from one pair of openings 20 to another.

(25) In a state of the adjustment member 6 separate from the formwork panel member 7, the leaf spring 16 is undetachable from disc element 13, but slideable and tiltable with respect to the disc element 13. For this purpose, the leaf spring 16 has a longitudinal slot 23 that allows for a downward and upward movement of the leaf spring 16 with respect to the disc element 13. Furthermore, the leaf spring 16 is horizontally moveable on horizontal flanges 24 connected to the disc element 13. Thus, when detached from formwork panel member 7, the leaf spring 16 may both be tilted and moved upwards/downwards with respect to the disc element 13. This facilitates the mounting of the adjustment member 6 at the through-opening 11 of the formwork panel member 7, as will be explained below.

(26) FIG. 8A show the attachment of the adjustment member 6 at the through-opening 11 of the formwork panel member 7.

(27) In a first step, the adjustment member 6 is provided demounted from the formwork panel member 7. In this state, the fastening element 15 is tilted and moved upwards so that the fastening element 15 may be inserted through the through-opening 11 of the formwork panel member 7 (see FIG. 8A).

(28) Then, the disc element 13 may be brought in abutment with the formwork panel member 7 (see FIG. 8B).

(29) As soon as disc element 13 is in place, the fastening element 15 is pivoted backwards and slid downwards into its upright mounted state, in which the disc element 13 is pressed against the front side 8 of the formwork panel member 7 (see FIG. 8C).

(30) FIG. 9A and FIG. 9B show the adjustment member 6 with a different embodiment of the fastening element 15 which, in this case, is a wedge 25 cooperating with the flange 24 projecting from the disc element 13. The wedge 25 has a transverse element 26 which prevents an involuntary detachment of the wedge 25 from the disc element 13. By moving the wedge 25 downwards against the flange 24 the wedge 25 is blocked at the back side 9 of the formwork panel member 7 so that the disc element 13 is pressed against the front side 8 of the formwork panel member 7 (see FIGS. 10, 11).

(31) As can be seen from FIGS. 12A to 12C, the mounting of adjustment member 6 at the through-opening 11 by means of the wedge 25 is done in the same fashion as in the embodiment shown in FIGS. 8A to 8C. First, the wedge 25 is tilted and moved upwards to allow for the insertion of the wedge 25 into the through-opening 11 (see FIG. 12A). In this position, the disc element 13 may be brought in contact with the front side 8 of the formwork panel 7 surrounding the through-opening 11 (see FIG. 12B). As soon as the disc element 13 is in place, the wedge 25 is moved downwards to be blocked at the back side 9 of the formwork panel member 7 (see FIG. 12C).

(32) In the embodiment shown in FIGS. 13A, 13B, 14, 15 and 16, the disc element 13 has a first disc 13a and a second disc 13b. The first disc 13a is rotatably arranged in the through-opening 11 of the formwork panel member 7. The second disc 13b is rotatably arranged in a receiving opening 26 (see FIG. 16) of the first disc 13a. The second disc 13b has the through-hole 12 for passing tie rod 4 therethrough. The receiving opening 26 is eccentrically arranged within the circumference of the first disc 13a. In the same way, the through-hole 12 is eccentrically arranged within the circumference of the second disc 13b. The disc element 13 has a third disc 13c fixed to the first disc 13a, for example by means of screws 27 (see FIG. 16) to secure the second disc 13b to the first disc 13a. In this embodiment, the second disc 13b is rotatably arranged between the first disc 13a and the third disc 13c. The arrangement of the third disc 13c prevents an involuntary removal of the second disc 13b from the first disc 13a. The third disc 13c is also used to hold all components of disc element 13 together by using a single wedge element 34 (see below), in any position of the discs. The third disc 13c has a through opening 28 slightly smaller in diameter than the second disc 13b so that a peripheral region of the second disc 13b is axially secured by means of third disc 13c. Furthermore, the first disc 13a has a circumferential projection 29 engaging a corresponding circumferential recess 30 of second disc 13b to block an axial movement of the second disc 13b with respect to the first disc 13a in direction of the pouring space 3.

(33) In the shown embodiment, a frame 31 for disc element 13 is mounted at the through-opening 11 of the formwork panel member 7. The frame 31 has a hollow cylindrical insert 31a fitted into the through-opening 11 and fastening members 31b attached to the back side 9 of formwork panel member 7. At cylindrical member 31a, the frame 31 has attachment openings 32 for inserting a lock 33, here with a wedge element 34, which, in the locked state shown in FIGS. 13A, 13B, 14 and 15, holds the disc element 13 in place.

(34) In the shown embodiment, the frame 31 has a first sealing edge 43 for a linear sealing contact with the first disc. The first disc 13a has a second sealing edge 44 for a linear sealing contact with the second disc 13b.

(35) FIGS. 17A to 17C illustrate the arrangement of the tie rod 4

(36) in the disc element 13 having the first disc element 13a, the second disc element 13b and the third disc element 13c.

(37) First, tie rod 4 is passed through hollow cylindrical member 31a of the frame 31 while the disc element 13 is detached from the formwork panel member 7 (see FIG. 17A).

(38) Second, the tie rod 4 is passed through the through-hole 12 of the second disc 13b while the disc element 13 is still detached from the formwork panel member 7.

(39) Third, the through-hole 12 of the disc element 13 is moved relative to the formwork panel member 7 for adjusting the position of the through-hole 12 to the desired position of the tie rod 4. To this end, the first disc 13a and/or the second disc 13b are rotated depending on the position of the tie rod 4.

(40) Fourth, with the through-hole 12 in the correct position, the disc element 13 is put in place inside the frame 31 to fill out the through-opening 11 of the formwork panel member 7.

(41) Fifth, the disc element 13 is secured by means of the wedge element 34.

(42) FIGS. 19 to 22 show a variant of the embodiment illustrated in FIGS. 13A to 18. Not all parts are shown in all drawings.

(43) In this embodiment, the second disc 13b is tiltable with respect to first disc 13a. Thus, the second disc 13b may be tilted forward, backward, upward/downward (or a combination thereof) with respect to an upright position extending parallel to the front side 8 of the formwork panel member 7. As can best be seen in the detailed view of FIG. 20, the adjustment member 6 has a first circumferential edge 36 for a linear contact with a spherical indentation 35 at the back side of second disc 13b. The adjustment member 6 further has a second circumferential edge 37 for a linear contact with a spherical surface at the front side of the second disc 13b. The spherical indentation 35 at the back side and the spherical surface at the front side have the same center point to allow for the tilting of the second disc 13b.

(44) FIGS. 23, 24 show another variant of the embodiment of FIGS. 13A to 17C.

(45) In this embodiment, the lock 33 has a clamping tool 38 with a rail 38a having hooks 38b for connection with the frame 31. A clamping screw 39 is mounted on the rail 38a. By tightening the screw 39, the disc element 13 is secured to the formwork panel member 7. A spring 40 holds the tightening screw 39 in position before the screw 39 is tightened.

(46) FIGS. 23, 24 also show the tensioning of the tie rod 4 projecting through a waling 42 of the formwork panel 2 by means of a screw nut 41.