Method and apparatus for drilling dewatering holes into a hollow-core slab

(19)

(11)

EP 0 940 236 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	09.01.2002 Bulletin 2002/02

(43)	Date of publication A2:
	08.09.1999 Bulletin 1999/36

(21)	Application number: 99660028.4

(22)	Date of filing: 17.02.1999

(51)	International Patent Classification (IPC)⁷: B28D 1/14

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

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Priority:

04.03.1998 FI 980490

(71)	Applicant: Addtek Research & Development Oy Ab
	03101 Nummela (FI)

(72)	Inventor:
	Kankkunen, Heikki 03600 Karkkila (FI)

(74)	Representative: Langenskiöld, Tord Karl Walter et al
	Oy Jalo Ant-Wuorinen Ab, Iso-Roobertinkatu 4-6 A 00120 Helsinki 00120 Helsinki (FI)

(54)	Method and apparatus for drilling dewatering holes into a hollow-core slab

(57) Method and apparatus for drilling dewatering holes into the lower surface of a concrete hollow-core slab (5). The apparatus comprises at least two drills (10) connected with a slab lifting crane. The drills (10) are attached to a detachable beam (9), and the apparatus is provided with at least two interchangeable beams with different mutual distances between the drills. The beam (9) is fastened to the apparatus by means of a quick-release fastener.

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