Om Materialprøvningens Udvikling i Norden
Og om Statsprøveanstaltens Virksomhed
År: 1909
Sted: Kjøbenhavn
Sider: 185
UDK: 6201(09)
Emne: Trykt hos J. Jørgensen & Co. (M. A. Hannover)
On the development of testing of materials in the north and on the work of the danish states testing laboratory in Copenhagen (english translation)
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162
s; in the first is placed the named knife-edge of the lever bearing
against the edge-pillow of the frame, in the second the knife-
edge which transfers the pressure to the pipe and in the third
a bolt furnished above with a center-mark for the applying of
the scale with the weight. It has namely been considered ap-
propriate not to suspend the scale on a knife-edge but to use a
suspension shown on a somewhat larger scale at p. 70 in fig.
26 and 27. In the steel-plate s is an oblong hole in which the
bolt b can be displaced in the longitudinal direction of the lever
and then be fastened, so that it is possible to attain that the pro-
portions remains continually 1:10 even if the length of the wooden
beam should be somewhat changed in drying up or swelling.
In the bolt head b is the center-mark where the taper of the
link B is applied. In the link the scale is suspended as shown
in fig. 25 and 27.
The loading is made by means of weights or by pouring water
into a bucket placed on the scale.
With this apparatus can be tested pipes where the outward
diameter is up to 32" (84 cm).
As indicated at p. 69 in fig. 25 the pipe is during the test
placed on a block O of pieces of beams and planks placed on
the concrete foundation K. The pressure is transferred to the
pipe through a piece of beam Q to the top of which is screwed
a piece of iron-plate where the knife-edge can touch.
Between the block and the pipe as well as between the piece
of beam Q and the pipe is placed a piece of felt of a thickness
of about 15 mm in order to spread the pressure as evenly as
possible over the whole length of the pipe. During the test the
pipe is placed in such a way that the whole length except the
socket is exposed to pressure.
As results of crushing-tests with clay- and cement-pipes, as
far as the knowledge of the Laboratory goes, have only been
published from few quarters, the Laboratory will here give all
results obtained until the 1st of July 1909.
In the Table VII below is given the result of the crushing-
tests with all clay-pipes tested up to the 1st of July 1909. In Table
VIII occurs the result of Ihe crushing-tests made with cement-
pipes up to the same date. The sign { means that two or more
pipes of the same dimensions were sent in and tested at the same
time.