:
Hong Kong Builder
11
F
VARIOUS TYPES OF STALLS
The piling upon which the building stands was carried out by the Vibro Piling Co., Ltd. Before commencing pilling, portions of the foundations of the previous build- ing were removed. This entailed the breaking up of large masses of lime and cement concrete with the aid of compressed air operating pavement breakers.
Below and encased in the cement concrete were hard- wood stringers and cross bearers dowelled into the hard- wood piles. As these were below the water table con- siderable pumping was necessary to enable their removal.
A total of 390 Vibro cast-in-situ piles of an everage length of 35 ft. were driven, ranging from 7'-6" to 61'-6′′ in length below the pile cappings.
The ground in which the piles were formed consisted chiefly of yellow clay and sand intermixed with a consi- derable quantity of boulders of various sizes, and, in order to displace these boulders and make way for the final pile, it was found necessary to drive down the piling tube fitted with a collapsible steel shoe and then extract the same before driving in the usual Vibro manner.
At
One of the features of the building is the lift. Des Voeux Road entrance to the New Central Market there is one "Express-S.M.S." Combined Passenger and Goods Lift. It is designed to carry twenty persons or a load of 3,000 lbs. at a speed of 200 feet per minute. It serves four floors and is pilot switch controlled by a lift attendant.
At each landing there is a lift position indicator which shows, by means of luminous figures on an opal glass screen, the floor at which the lift is standing.
The indicators also incorporate the call pushes and they therefore present a very attractive and neat arrange- ment.
Each landing opening is protected by three single leaf sliding doors of equal size. These doors all slide in one direction, each at a different speed, so that when fully opened they are concealed behind the enclosure with their leading edges in line with the entrance. The door panels are constructed of fireproof special sheet steel reinforced to resist stresses and are non-warping. Means are provided to open doors from the landing when the occasion arises.
The lift car bodywork is constructed of sheet steel and is cellulosed and polished just in the same manner as the landing doors.
There are two lights for illumination and one fan for ventilation inside the car. Also there is a trap door normally closed on the ceiling to provide for an emer- gency means of escape.
The controller and driving equipment are in the motor room on the roof. Also adequate safety devices are provided for the lift in that the main hoisting ropes are automatically equalised and a speed governor is provided so that in the event of over-speeding the lift will be stopped and the safety gear will come into opera- tion. Also there is a phase failure and phase reversal relay on the controller so that the lift will be inoperative in the event of an earth in any of the mains of the 3 phase supply and also when the phase rotation of the supply is reversed.
Page 5Page 6