WO1988003848A1

WO1988003848A1 - A method for fastening a detail onto a surface of a building structure, and a jig for making a hole for carrying out the method

Info

Publication number: WO1988003848A1
Application number: PCT/SE1986/000543
Authority: WO
Inventors: Folke Strid; Roland Halvarsson
Original assignee: ANDAROSA AB
Current assignee: ANDAROSA AB
Priority date: 1986-11-28
Filing date: 1986-11-28
Publication date: 1988-06-02
Anticipated expiration: 1989-05-28
Also published as: SE448072B; SE8502714L; SE8502714D0

Abstract

In order to attach an object to the facade of a building a first horizontal hole (4) is drilled in the facade into a floor slab (3), and a second hole intersecting said first hole is drilled from below in the floor slab (3) inside the building. A fastening bolt is placed in the first hole (4) and an element locking the fastening bolt against withdrawal is introduced in the second hole (5). For drilling the second hole a drilling jig (22) is used having a centre pin (23) which is introduced into the first hole and which carries one end of a system of rigid bars (24, 25, 26), the other end of which carries a drilling bushing (27) which, by means of the bar system, is always kept in such direction that its axis (27') intersects the axis (4') of the first hole (4).

Description

A METHOD FOR FASTENING A DETAIL ONTO A SURFACE OF A BUILDING STRUCTURE, AND A JIG FOR MAKING A HOLE FOR CARRYING OUT THE METHOD

The present invention concerns a method for attaching an object to a surface of a building construction, such as the facade of a concrete building. The invention also concerns a drilling jig for drilling, in a building structure, holes hecessary for performing the method.

A problem primarily when rebuilding building constructions is to attach attachment objects to a surtace of the construction. As a typical example can be mentioned the problem of mounting on an existing house facade of concrete fastening elements for balconies. It has hitherto been necessaty to resort to casting-in fastening elements, which has brought about great damage to the builsing, or use of expansion-shell bolts, which become unsafe in course of time.

The problem mentioned is solved in an advantageous manner by utilizing the method and the drilling jig adapted for performance thereof stated in the appended claims.

The invention will now be described under reference to the accompanying drawings, wherein fig. 1 is a vertical section through a facade wall and a connecting floor slab showing an example of a fastening element mounted according to the invention, fig. 2 shows a drilling jig for drilling of holes necessary for that factening element, fig. 3 shows another embodiment of a drilling jig according to the invention, which comprises an increased possibility of adjustmemnt of the drill bushing, fig. 4 is a section along the line IV-IV of fig. 3, fig. 5 shows a third embodiment of a drilling jig according to the invention, fig. 6 shows a variant of that embodiment, while figs. 7, 8 and 9 are a cross section, a horizontal central longitudinal section, and a vertical longitudinal section, respectively, through a chain used in this variant.

In fig. 1 is shown a vertical section through the facade of a concrete building having two facade elements 1 and 2 and a floor slab 3. In order to mount onto the facade any kind of attachment object, such as a balcony, according to the invention firstly a horizontal first hole 4 is drilled in the floor slab 3. Thereafter, a second hole 5 intersecting the first hole 4, preferably under right angle, is drilled from below in the floor slab. In the second hole 5 is introduced a cylindrical nut 5, into which from outside the facade through the hole 4 is threaded a fastening screw 7 threaded in both ends. For facilitated positioning the cylindrical nut 6 preferably has a hexagonal head 8, by which the nut can be held by a socket wrench. After completed mounting a lid 9 can be placed in the drill hole 5 and sealing compound 10 be applied around the screw 7 in the drill hole 4. To the screw 7 can now be safely mounted any attachment object desired.

For drilling of the hole 5 a drilling jig according to the invention is used. An embodying example of such is shown in fig. 2. The drilling jig shown therein comprises a cylindrical centre pin 12, an arm 13 rigidly connected and radially directed thereto, an arm 14 attachable thereto under right angle, and, finally, a drilling bushing 15 rigidly connected to the inner free end of the arm 14, the axis 15' of which being directed towards the axis of the centre pin 12.

The centre pin 12 with attached arm 13 is introduced in the first drilled hole 4. Parallel with the hole 4 a hole 16 is drilled in the facade element 2. From the inside of element 2 the arm 14 is introduced in the hole 16 and connected to the arm 13 by tightening of a screw 17. Means not shown is responible for the drilling bushing 15 being directed towards the centre line 4 of the hole 4. By means of a drill 18 guided in the drill bushing 15 the hole 5 is then drilled. For the drilling of the hole 16 a separate drillin jig can be used, or, it can be contemplated to use arm 13 for that purpose.

After the drilling jig has been removed the hole 16 can be filled with isolating material 19 and be closed from both ends by plugs 20, 21.

The embodiment of a drilling jig 22 according to the invention shown in figs. 3 and 4 comprises a centre pin 23 and a first bar 24, a second bar 25 and a third bar 26, the latter carrying a drilling bushing 27. The centre pin 23 here has the function of a self centering expander bolt and includes a screw 28 having threads 29 in one end and a head 30 in the other end. Around the screw 28 are arranged, counted from the head 30, a resilient sleeve 31, a rigid sleeve 32, a resilient sleeve 33, a rigid sleeve 34 and a washer 35. By means of a nut 36 the resilient sleeves 31 an 33 can be clamped between the screw head 30 and the sleeve 32, and, between the the sleeve 32 and the sleeve 34, respectively, so that they expand and fix the screw centrically in the hole 4.

The first bar 24 is rigidly fastened, e.g., welded, or rigidly fastenable, e.g., by means of a non-shown stop scre or a non-shown clamping joint, to the rigid sleeve 34, such that the the bar 24 upon tightening of the nut 36 can be fixed in any position desired in a radial plane about the screw 28.

The bars 24 and 25, and, 25 and 26, all having square cross section in this embodiment, are inter-connected by means of clamping joints 37 and 38, respectively. Each such joint comprises a solid block, in which are arranged relatively perpendicular openings 39, 40 and 41, 42, respectively, and slots 43, 44 and 45, 46, respectively. By means of screws 47, 48 and 49, 50, respectively, the jaws thus formed on either sides of the openings 39, 40 and 41, 42, resectively, and the associated slots are clampable about the rods 24, 25 and 25, 26, respectively. Thus, the drilling bushing can be positioned and fixed at every radial distance from the centre pin 23 and the hole 4, respectively, and in every axial position parallel thereto, limited only be the lengths of the rods 24, 25 and 25.

In the example now described the drilling jig is shown being introduced through a window opening 51 having a window frame 52 in the facade instead of through an opening made for the purpose.

The above-mentioned posibility to fix the rod 24, and with it the entire rod system 24, 25, 26 with the drilling bushing 27, in a radial plane about the screw 28, is for the case that a hole 4 has to be drilled in the area of an inner wall, and, thus, the drilling bushing 27 cannot be placed against the floor slab 3 straight below the hole 4. In this case, anyhow, a hole intersecting the hole 4 can be drilled, which hole then is inclined against the vertical plane.

In the embodiment shown in fig. 5 the centre pin is the same as the bolt 23 shown in fig. 3. In the rigid sleeve 34, however, in this instance is attached a holder 53 to which is pivotably connected a link 54 of a chain 55 containing several similar flat links, the last link 56 of which is pivotably connected to a drilling bushing 27 similar to the one according to fig. 3. It is realized that, the chain 55 having a high degree of precision, i.e. there being substantially no play between its links, the axis of the drilling bushing will always be directed towards the hole axis 4' as soon as the drilling bushing is brought into abutment with the slab 3 or to any other position where its axis is not parallel with the hole axis. In the position shown in fig. 5 the drilling bushing can be moved along the floor slab 3 to a position desired. This position easily ca be measured from the inside of the facade element 2.

A variant of the embodiment of fig. 5 is shown in fig. 6. Herein the conventional flat link chain is replaced with a chain 58 comprising pieces of quadrangular tubes preferably having rectangular profile. A cross section through such a chain is shown in fig. 7 and two mutually perpendicular longitudinal sections in figs. 8 and 9. Thus, the chain 58 comprises alternatmgly quadrangular tube pieces 59 and quadrangular tube pieces 60, the latter of which are housed within the former. In the long direction of the tube pieces there is no play between the tube pieces, whereas there is certain play in both directions in the short direction between the inner tube piece 60 and the outer tube piece 59 By means of rivets 61 or corresponding means the tube piece are pivotable relative each other. However, the pivotabilit is limited by abutment of the inner tube pieces internally of the outer tube pieces 59.

As an alternative to the embodiment of the chain now described one can be contemplated where the the dimensions of the tube pieces contmously decrease from the holder 53 towards the drilling bushing 27.

It is realized that the vertical sections through the building construction shown may be horizontal sections as well, in which case the horizontal floor slab 3 would be a vertical wall and, thus, the axial directions of the hole 5 and the drilling bushings 15 and 27 would be horizontal.

Claims

1. A method of attaching an object to a surface of a building construction, c h a r a c t e r i z e d i n that a first hole (4) is drilled in said surface of the construction, that a centre means (12;23) is introduced in said first hole (4), that, starting from the centre means, a second hole (5) intersecting said first hole (4) is drilled in another surface of the building construction, that a fastening element (7) is introduced in said first hole (4), and, that a locking element (6) preventing withdrawal of the fastening element (7) is introduced in said second hole.

2. A drilling jig for drilling in a building construction two intersecting holes under performance of the method according to claim 1, said drilling jig including a centre means (12;23) introduceable in a first hole (4) pre-drilled in a surface of the building construction, and a drilling bushing (15;27) for drilling of a second hole (5) intersecting said first hole (4), c h a r a c t e r i z e d i n that the drilling bushing (15;27) is connected to the centre means (12;23) by means of a plurality of mutually connected, rigid means (13,14;

24, 25, 26; 54, 56; 59, 60) keeping the drilling bushing at a radial distance from the axis (4') of said first hole and axially displaced therealong, such that the axis (15';27') of the drilling bushing is permanently directed towards the axis (4') of said first hole.

3. A drilling jig according to claim 2, c h a r a c t e r i z e d i n that said rigid means constitutes a link system (24, 3, 25, 38, 26; 55; 58) adapted to allow the drilling bushing to be radially displaced relative to the centre means (23) while the axis (27') thereof is permanently directed towards the axis (4') of said first hole (4).

4. A drilling jig according to claim 3, c h a r a c t e r i z e d b y a rigid first bar (24) connected to the centre means (23) and extending in the radial direction thereof, connected thereto a rigid second bar (25) fixed in the direction of the axis (4') of the centre means (23), and, connected to said second bar a rigid third bar (29) directed towards the axis of the centre means, said third bar carrying in its free end the drilling bushing (27) such that the axis (27') thereof is perpendicular to the axis (4') of said first hole (4).

5. A drilling jig according to claim 4, c h a r a c t e r i z e d i n that said second bar (25) is displaceable in the longitudinal direction of said first bar (24) and in the longitudinal direction of itself, and that said third bar (26) is displaceable in the longitudina direction of said second bar (25) and in the longitudinal direction of itself.

6. A drilling jig according to claim 4 or 5, c h a r a c t e r i z e d i n that said bars (24,25,26) have polygonal profile, preferably quadrangular profile.

7. A drilling jigg according to claim 4, 5 or 6, c h a r a c t e r i z e d i n that said bars (24,25,26) are coupled to each other by means of clamping joints

(37, 38) which in their released state allow mutual displacement and in their clamped state fix two bars (24,25 and 25,26, respectively) relative to each other.

8. A driling jig according to any one of claims 4 - 7, c h a r a c t e r i z e d i n that the centre means (23) includes a bolt (28) which under centering is fastenable in said first hole (4.

9. A drilling jig according to any one of claims 4 - 8, c h a r a c t e r i z e d i n that said first bar (24) is positionable in different angular positions in a radial plane about the centre means (23).

10. A drilling jig according to claim 3, c h a r a c t e r i z e d b y a link system (55;58) being unpivotable in a radial plane about the centre means (23), but being pivotable in the axial direction of the centre means.

11. A drilling means according to claim 10, c h a r a c t e r i z e d i n that the link system includes a chain having flat links (54,56).

12. A drilling jigg according to claim 10, c h a r a c t e r i z e d i n that the link system (58) includes quadrangular tube pieces (59,60) partly introduced in each other and pivoted to each other, said tube pieces having no mutual play in the unpivotable direction of the link system but having limited mutual play in its pivotable direction.