and sand fill were categorised during loading at the borrow areas accord- of material passing a no. 200 B.S. ing to the percentage by dry weight sieve. As the category determined the destination of the barge, it was necessary to develop a rapid and re- liable method of testing.
A pycno- meter method was developed and a large series of check tests made by comparison with the standard labora- tory method.
Further analyses were made to de- termine whether the few tests for which time was available, usually three in each 1,200 cu. yd. barge- load, gave results which were repre- sentative for the barge load as a whole.
An extensive soil testing program- me, including more than 120 con- solidated-drained triaxial tests and 290 undrained triaxial tests, was un- dertaken to determine the engineering properties of the foundation material at the ten instrumented cross-sections. It was thus possible to keep a close watch on the shear strength of the foundation material at any stage of construction.
As mentioned the Hydraulics Re- search Station undertook a model in- vestigation of the closure of the main dam. One of their findings was that the probable maximum velocity dur- ing tidal flow over the original sea- bed mud during closure would be 4.0 ft./sec. A series of model tests was made on site to examine the erodability characteristics of sea-bed mud at velocities above 4 ft./sec. and thus to determine whether or not erosion is likely to occur. The model consisted of a small flume with an undisturbed sample of sea-bed mud set in its invert in which the velocity of water was varied by adjusting the inclination of the flume. The inves- tigation concluded that a tidal velo- city of 6 ft./sec. would cause significant erosion of the sea-bed mud. Acknowledgment
No.
APPENDIX
DETAILS OF PLANT EMPLOYED ON THE WORKS
Marine Plant
Туре
Grab dredger-placer "Biarritz"
1
1
Bucket dredger "Haiphong"
Bucket dredger "Yau Wing" Cutter suction dredgers
"St. Jean de Luz"
"La Rhune"
"Yau Keung"
Size or Capacity
2 x 1,100 b.h.p. (diesel-electric)
2 x 22 cu. yd. buckets (mud dredging)
2 x 18 cu. yd. buckets (decomposed rock
placing). 720 b.h.p. (diesel-electric) 96 x 0.65 cu. yd. Steam. Direct-drive 40 x 1.00 cu. yd.
2 x 500 b.h.p. 24 in. dia.
2 x 200 b.h.p.
12 in. dia.
330 b.h.p.
18 in. dia.
440 b.h.p.
"Yau Po"
18 in. dia.
3
Grab dredger placers Lima 2400
7 cu. yd.
Bucyrus Erie 71B
4 cu. yd.
Remarks
Average cycle time 100 seconds.
Each bucket is under independent semi-auto-
matic control. Maximum trolley travel 120 ft.
Belt speed 16/22/28 buckets/min.
Belt speed 15 buckets/ min.
Bucyrus Erie 51B Self-propelled barges
3 cu. yd.
1,200 cu. yd.
400 to 600 cu. yd.
12 sets of bottom open- ing doors. 2 "Shottel" units each of 180 h.p. 2 barges self-propelled with I "Shottel" unit each.
5
14
Dumping barges, miscellaneous
17
Tugs
6 of 150 h.p.
11 of 360 h.p.
1
Rock skip handling
pontoon crane
"Artha 11"
32
Rock skips
22 cu. yd.
Towed in trains of ten each.
6
Cargo barges (sub-contractors')
500 tons
Land Plant
No.
Type
5
Loading conveyors
1
Demag wheel excavator
40 in.
3
Bucyrus Erie 718
42 cu. yd.
excavators
no
2
Bucyrus Erie 51B
3 cu. yd.
excavators
2
Caterpillar 988 traxcavators
5 cu. yd.
22 cu. yd.
12 cu. yd.
The author wishes to thank Mr. J. K. Holt, Resident Engineer, Mr. C. J. Dunnicliff, Senior Assistant Re- sident Engineer, and other members of his staff who have helped with the preparation of the paper, and Messrs. Societe Francaise d'Entreprise de Dragages et de Travaux Publics for permission to publish fig. 1.5.
3 Caterpillar 977
traxcavators
2 2 22-
1
Caterpillar 955
traxcavators
Bulldozers,
miscellaneous
Trucks
Sub-contractors' lorries
Crushing plant
14 Rock drills, various
Size or Capacity
48 in.
Remarks
2,000 cu. yd./hr. 1,500 cu. yd./hr.
18 cu. yd.
3 cu. yd.
200 cu. yd./hr.
Report on Berlin Housing Congress
(Continued from page 53)
of
public or private agencies; about the acquisition and re-use of land; about the ultimate ownership of compulsory purchased land: about merits emphyteusises over freeholds: about problems of rehousing and reinstalla- tion, (who pays for the removal, for
Far East Architect & Builder November, 1967
by Prof. W. G. Gregory
instance); and about programming and phasing and so on.
It will be apparent that the con- ference ranged widely over the general subject, many aspects of which warranted a separate con- ference; the merit of this lay in in-
dicating that many of the problems were by no means unique and some courage could be derived from this (though as has been said the ap- proach to the solution itself is likely to be unique).
It also indicated that, though there may have been originally a tendency towards regarding urban renewal as some kind of mystic, many architects. planners, sociologists and economists were working to similar ends uncon- cerned with precise definitions, but very much concerned with bettering man's environment and improving his social condition.
63
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