Dulong Mining Company

Title

Language

English

Source

The Marsman Magazine Volume I (No. 9) March 1937

Year

1937

Rights

In Copyright - Educational Use Permitted

Fulltext

MARCH, 1937] THE MARSMAN MAGAZINE 17 The Jubilee Reservior (Continued from page 15) Pitching The stone pitching on both of these dams was considered to be unique. As a general rule, stones forming pitching are laid horizontally, but as the rock fill forming the downstream part of was decided to use it for this purpose. The central part of the rock fill has settled to date about 4 feet, part of the settlement having occurred since the pitching was laid, but there. is no apparent evidence of this in its appearance. Steps on Face of Dam Although it is unusual to bring up a the Shing Mun Dam is not founded on dam in higher lifts than 5 or 6 feet, it rock but on comparatively soft material It was decided to construct the diaphragm it was certain that it would settle. in 20 foot lifts on the Shing Mun Dam. was thought that if the pitching were It is customary to bolt "soldiers" to laid at an angle of 45 ° in a series of the face of a dam to carry sliding panels alternating slopes~ the settle would not between them against which to place so easily be noticed, especially if joints the concrete but at Shing Mun, with were broken every few stones. So it the special and comparatively thin diawas that the design of the pitching was phragm, it seemed better to do a way first evolved purely to dissemble the with bolts, and the steps on the dam are effects of settlement, but on working the result of a study to that end. They out details it was noticed that the h d f 1 d l'k changing slopes led to the formation of ave prove very success u an i ewise afforded very convenient walka pointed arch and that the arches gave w~ys from one side of the dam to the additional strength to resist any ten- other. dency which the pitching may have had to slide downwards. It was decided to "break joint" every third stone by half the height of a course, which involved the insertion of snecking stones, and as blue granite was locally available it The estimate of cost of the works was $9,200,000, and although nearly $300,000 worth of extra works have been added, the whole works were completed for approximately $8,000,000. Dulong Mining Company The total advance for the month of February on the Sampaguita, Aurora, and Luna sections was 1,019.5 feet. A crew of 12 men completed 780 meters of road on the Bimmace-Bola:figet project. The survey to all the portals was completed during February and the map is expected to be completed in about six week's time. . An epidemic of influenza caused some trouble last month but all employees have recovered.

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