1947-07-17 — Page 9

"TWO-WAY

TALKIE"

THE CHINA MAIL, THURSDAY, JULY 17, 1947.

ENGINEERING: Continued From

World's Longest Welded Girder Bridge

of

What is thought to be the 7 in. for the 30-ft. shore spans, In fabrication, the web plates longest we'ded continuous- the flange plates ranging in were first Inld out and flame girder bridge in existence has thickness from 2 in, to 1 cut to the correct profile, allow been built cross the River des in. Web plates in thick areance being made for the dead web details were Miles Bra at St. Rose, about 16 used throughout, with heavy land. All

welded in place. The miles north of Montreal. The plate stiffeners over the bear then

and inside stilleners at flange plates were butt-welded, river forms one of the branches inga Into whieb the St. Lawrence intermediate

These pressed or rolled to the correct points,

and then assembled on divides at Montreal Island and lutter consist of 6 in, by 3% curve

webs, being squared and da uned mainly by small pleasure la. by 6/16 in. angles, foe the eraft, so that the hydroom re-welded to the webs; they are held in position by temporary Continuous flet welds quired is limited. The feature calculated to provide buckling | hraven, of the bridge of interest and strength equivalent to conven- were then ninde niterifately, at Importance is the fact that it tional double-angle stiffeners, the loji and bollo flanges, in consists of a welded rontlóuous-Every second stiffener is capped sequence which limited over- W girder 1,500 ft. long. rather to form a seat for a floorbenin, all vertical distortion to a in. The than its height above the river being faced and welded to the maximum

fori shenr only. anges and web plates, which or any speria' problem present girder weba ed in the construction of the The sidewalks are carried in had been left long, were then piers. The bridge Kes on the cantilever brackets, similarly lume-ent to the final length and main runt from Montreal to faced and welded to the girder preqarel for fleld welding. the Laurentides Park and ear- webs for shear only. They are Adjoining girder sections were connected to the fluorbeams by then nasamb'ed in correct align

ment, and the flat and

field tenslon straps passing over the girders. The girder ottor splier hntes were drilled from langes are braced by knee bracaleel templates, femporary field kets for every floorbem in the splice plates being drilled from the sami. templates. When the compression zone and for alter- nute Boorbeams elsewhere, girder sertions werd in position Over the piers, the doorbrams in the field, the splice plates were sveured to them by. pina, are deep welded girder sections, proportioned to act as a bear this assuring correct anaembly. The devision, of the Departing frame adequate for al!

Splice Plates ment of Public Works of the intern forees, Nos permunere i Erection was carried out by

• *Province of Quebec to adopt a top or bottom lateral are pro-f means of a derrick traveller, a ***Welded continaus girder of visted, the concrete deck luring portable steel bent being used Anchi uaprevedented length was en'vulated to resist all interal for supporting the central gir Based on the lisfactory per loads, Light temporary dinį der sections of each span be formance of a number of abort. į Konals were installed for allsen for the pier sections were In er bridges enllying the same [ing the girders- during erection, Type of FoneCurtion. The mat,jbát were removed after the con- 446 ft. long, was built in 192screte of the deck had been at St. Anne de la Perade on the poured. main Toad between Mustreal and Québec. The cost of this

Page Eight

From Page

Home-Building Scheme

Take the case of Mr. & Mrs. Souza and their family of three. They are better" off financially than Mr. Wong and want

ground larger house and more for which they take up 60 shares. At 0% Interest thefr

monthly payments would be $530, while at 2%, they would be $405. AL- though a good percentage of the payments would

be saving Mr. Souza might not be in position to scrape together the, difference of $120 each month. If the rate Interest in over 24 the Souzas will have to be content with smaller house with less ground,

Profits Pooled

Suppose that, after three years, building costs drop. Mr. & Mrs. Smith who are new arrivals in the Colony require the name ne commodation for their family a the Souzas. It is suggested that they should pay the same month- ly installments as Mr. Souza. The profits all go into the anal and are distributed between the mem- bera in direct proportion to the paid-up value of the shares they

Rate of interest

per annum Amortisation

(Continued From Page Eight)

PAYMENTS PER ANNUM

6%

4%

2.2%

$1,000.

$1,000.

$1,000 $1,000

Interest

2,000

1,000

1,200

1,000

Crown Rent

130

130

180

130

Assessment inx 17% of

$125.00 per month.

250

256

200

250

Property tax 4% on

$125.00 per month.

00

00

CO

Management fea

192

132

102

00 TO%

$4,239

$3,896

$3,438.

13,238

Total payments per

month to the nearest $5.00

$285

Total payments

per annum

Note:

$356

$270

1. Water, insurance and repairs are al payable by Mr.

Wang,

2. Management for is based on offer expebson at $4,000 per .

month, 10,000 shares at 40cts, would yield this anunt.

hold. The important point that Mesara, Wong, Souza and Smith must realise in that the organisa- tion in theirs and its success will depend on the extent to which.

co-operate.

they are willing to 20-ton

ries maduly motor traffic. The rondway is

with 25 ft, wide, |"two 4-ft. sidewalks, and is de

Algned to

carry four 1.

vehirdes abreznt, or two 25 tons wide, hy dete, I replaces un ** o'i wouden bridge, eurried on Tork-filled timber cribs, which had been in continua service since 1810,

Disc Bearings

bridge compared very favour- | At the abutments, flush rond- Hably with that estimated for a why expansion Joints of the

riveted structure, and it was considered to present a better 34, appearance. I was followed, In 1937, by a 255-f1. bridge at Louisville, on the same roud. and shortly after by a 486-ft, bridge across the Bern-court Jiver, which lies some 20 miles South of the St. Lawrence. A further example was a bridge, 640 1. long, over the River

place. In connecting the soc tions, reliance was placed en- įtirely (90) the pinned splice plates, as it was impracticable tu enfoulate in advance the car- reet elevation of the partly- strained members. Levels taken after seven

spans had been

any other. Field we'ding was started after the third span had been assembled and was kept throughout at three

spans behind erection, which

was carried out from the south

the

over-lapping finger type are ferected showed an extreme er- tota: movement of 9.7 in. for first span and less than provided. These permit of a For in elevation of in. In the * in. half the bridge, which IN (2- quivalent to U temperature range from--40 deg. F. to 120 deg. F. The pier members which support the girders are provided with disc bearings to

qualise the lourds and have end of the bridge to the north, rullets varying from 5% in, to The procedure first adopted was Rouge at Calumet, 50 miles western are carried in

6 in. in diameter. The ru to commence welding at of Montreal.

nesis and centre of the web dates.pro- their direction of motion Is ceeding outwards to the flanges, 14 Spans

positively controlled. In the de- which were then butt-welded, The St. Rose bridge consists sign of the girders, calculation This regime was abandoned of 14 spans varying in length of moments and shears were when buckling was found to oe- from 90 ft. to 126 11. They are based on the momeat-distribh-¡ eur in the web during the disposed symmetrically about tion method, adjusted for varia- flange-we'ding operation, this "the central pier, to which the ble moments of inertia. Field being due apparently to the two main continuous girders joints were located as close as transfer of stresses when the nre fixed. These are spaced at practicable to points of least top splice plates of the flanges 32-ft. centres and carry a 52-moment in each Span. the gir were removed to permit welding Pft, wile comerete drek, & in. ders of the longest spans being to proceed. The mutter was thick under the roadway and G fabriented in lengths of 67 ft. dual with by flame-cutting the in. under the side-walks. The 6 in, and 18 ft. 6 in.; the cor- webs and re-welding them after brlige is in the form of a flat responding weights were 161 the flange we'ds had been cam- curve, the height at the central and 11 short tons. The total leted. A new procedure was --pler-being-8-ft-above-that-at-weight-of-structural-steel-in-the-then-adopted, the wobs being the Fabutments. The built-up bridge is 1.180 short tons, partly welded, for distances of girders vary in depth from equivalent to 1,520 b. per fund 12 in, from the top and bottom, ft. at the central pier to 4 ft. run.

(Continued at foot of next Col.)

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Also at the end of 20 years they the flanges then being welded | pay, no amortisation, no interest before the web welda were com and no management fee. ploted. The object aimed at The information supplied above was to ba'ance as far as possi- than to form any hard and fast

in intended

guide rather ble the longitudinal contraction, rulos. Bufficient details have been which amounted to about 6/32 | ***

upplied for any prospective in. per joint. The aplice holes home-owner to work out for him- In the flanges were plugged and self what he will be expected to we'ded over. Strength con- pay for the accommodation which aiderations did not arise, as the no might require for himself and net areas of the plates were his family. The cost of land, thy more than ample for the cal-time of repayment and the rate culated stresses. The bolt holes of interest he will be charged are in the webs were plug-welded therefore, Impossible to give any unknowns at the moment. It' la, for appearance.

Axed prices. The easier the tormi Poured In Sections the more will the scope of the Concrete for the deck was Building Society Increase In oured in sections, which ex- any caso, send in your nemam. ended between points of dead-mediately because the greater oad contraflexure in the gir- sunport we receive from the uvek fers, and which varied in shall be able to add to our repre munity the greater the weight we ength from 54 ft. to 92 ft. Bentations.

The concrete pour extended sver the roadway, the side walks and fanelas which maskëd

he sidewalk brackets giving a

Govt. Ald

There is no doubt that Govern- uniform external appearance, to ment will give, sympathetic con- the bridge throughout its sideration to any reasonable pro length. The forms used were posal and it is certain that with of 1-in, timber nalled to 2-in. Government assistance and whil by Gin and 2-in, by 8-in, ing co-operation from the com- stringers, which spanned the munity, the housing problem can spaces between the floorbèums,

be solved. The deck contains 3.200 cubic in the Hall of St. Andrew's A public meating will be hald furds of concrete and was pour Church, Kowloon, on Monday ed in 27 auctions at the rate of 28th July, 1947 ut dip.m., when one a day. No longitudinal or all will be given an coportunity nteral constructional joints to express their views. This moet were provided in the deck, Ex-| ing is not restricted to those who, perience had shown that there registered their

An Inter- names. is great difficulty in maintain Hugh Drags, Metropolitan

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