US1460115A - Reenforced-concrete railway and the like sleeper - Google Patents

Description

June 26, 1923. 1.460.115

D. H. STENT REENFORCED CONCRETE RAILWAY AND THE LIKE SLEEPER Filed Jan. 12, 1923 4 Sheets-Sheet l June26, 1923. 1,460,115

D. H. STENT REENFORCED CONCRETE RAILWAY AND THE LIKE SLEEPER Filed Jan. 12. 1923 4 Sheets-Sheet 2 "a aw I k c k :I LLMEIIHHI jinn 111.1

ATT'X June 26, 1923. 1.460.115

. D. H. STENT REENFORGED CONCRETE RA ILWAYAND THE LIKE SLEEPER Filed Jan. 12 1923 4 Sheets-Sheet s A-rry.

4 Sheets-Sheet 4 D. H. STENT REENFORCED CONCRETE RAILWAY AND THE LIKE SLEEPER Filed Jan. 12,

June 26, 1923.

Patented June 2%, 15925.

htthllS DUDLEY HEPBURN STENI, OF DELHI, INDIA.

nnnnroscnn-cononnrs nerrwar Ann was LIKE srnnrns.

Application filed January l2, 1923. Serial No. 612,238.

To all whom. it may ay/warn:

Be it known that l, DUDLEY HErBURN STENT, subject of the King of Great Britain, residing at No. 4 Un'derhill Road, Delhi, India, have invented new and useful Improvements in ReenforcechGoncrete Railway and the like Sleepers, of which the following is a specification.

This invention relates to reenforced concrete sleepers for railways or tramways of the separate pot or block type interconnected in pairs by a transverse bar, which serves either as a tie or a strut.

It has already been proposed to provide ineach pot of the sleeper a'transverse tubular guide socket extending right through the pot for the reception of the respective end of the tie or strut bar.

Such transverse tubular guidesocket also serves the function of correctly positioning in the mould the upper and lower metallic reinforcements of the pot which are in practice tied to the guide socket, inasmuch as the two ends of the guide socket are both located at and protrude from the surface of the cast concrete pot and can therefore be held in correct positionrelative to the respective surface of the mould.

Now for the sake of considerable economy it is desirable to have the tie or strut bar as short as possible, but such short bar would be too short to extend right through both the pots of the sleeper. ence, and also to effect economy, the tubular guide socket need not extend right through the pot.

The tubular guide socket for the end of the tie or strut bar has to be properly positioned in the mould and also is correlated to the correct positioning of the metallic reinforcements of the pot, and a tie or strut bar socket precariously held by one end only in the mould cannot be reliably positioned.

A member of the intertied reinforcement and guide socket can be brought to the sur face of the mould and thus provide an ad ditional. positioning bearing, but in the case of the reinforcement, which is of mild steel, the exposure to atmospheric influences 0 would rapidly set up rust resulting in local if not complete disintegration of the concrete pot.

According to the present invention, a short tie or strut bar socket having a single exposed end with means for positioning such socket in the concrete are employed.

The above disadvantage of exposure of the reinforcement is overcome,by providing that the member providing additional mould bearing for the intertied reinforcement and single exposed ended tubular guide socket is of a material resistant to atmospheric influences.

For example, a rod of the reinforcement can be brought nearly to the surface and be covered by a cement or brass cap flush with the surface of the concrete.

Alternatively at a suitable point or points of its length the embedded portion of the guide socket itself, which is of cast iron, may have an arm or arms extending to the surface. A further alternative is to arrange for the outer end or mouth of the guide socket, with the reinforcement secured to the latter, to protrude sufficiently from the surface of the concrete that it can be firmly positioned and held in a recess provided at the joint between the upper and lower portions of themould, for instance either by the clamping action of the closed mould or by a transverse pin passed through the walls of the recess of the mould and the mouth of the socket.

(lonveniently the covering device for a positioning rod of the reinforcement is arranged to serve as an abrasion or wear resistant member, being for instance a bar of cast iron on the upper surface to take the wear at the rail seat of the pot, or at the portions of the under surface of the base thereof exposed to impact of heaters in packing ballast beneath the pot.

' A representative example and modifications of the invention, are illustrated on the accompanying drawings, in which Fig. 1 is a side elevation of two concrete pots interconnected by a tie bar and constituting a complete sleeper, and

Fig. 2 is a plan thereof. Figs. 3, 4 and 5 are respectively side elevation, plan and transverse section, on a larger scale, showing the arrangement of the tie barguide socket, the reinforcement and the abrasion bars.

Flg. 6 is a transversesection of a modification.

Flgt't 7, and 9 are respectively side elevation, end elevation and plan, on a still larger scale, of a rail seat abrasion reslsting bar.

Fig. 10 is a fragmentary transverse sectional elevation showing an alternative method of securing the abrasion resisting bar to the. reinforcement.

Fig. 11 is a fragmentary transverse sectional elevation illustrating a method of positioning the reinforcement without employing an abrasion resisting bar.

. Fig. 12 is a sectional elevation of a portion of a mould with means for positioning the guide socket, and-Fig. 13 is a corresponding end elevation.

act arethe two pots of the sleeper interconnected by a tie bar Z), the ends of which bar enter tubular guide sockets c embedded in the pots a, the bar bbeing secured-ineach socket 0 by a single transverse cotter, pin, keyor bolt d.

To. avoid protrusion of the outer end of the-socket 0 beyond the main profile of the pot a, so that it may not be liable to damage, the pot a is recessed around theouter end of thesocket a, which latter is exposed for a length 'only sufficient for the reception of the single securing cotter or the like 03. The exposed end of the socket c is thickened to withstand the stresses .causecl by the tie bar'securing means- To avoid unnecessary length of tie bar and socket, the socket 0 extends only partway through the-pot a. Its inner end is closed to prevent inflow'of wet concreteonmoulding'the pot a-.

c is an upper and f a lower metallic reinforcement, eachconsisting ofa grid of mild steel rods, in practice of any suitable configuration.

These two reinforcements e and f should occupy definitepositions in the mass of concrete relatively to the tubular'socket 0, which latter obviously must also be positioned.

I The reinforcements e, f and the socket 0 are therefore tied together, whlchensures -tl1eir correct mutual positions, but, owing to the socket 0 protruding at one side only, ithe'correct position'of the whole assemblage relatively to the mass of concrete, is notinsure'd solely by the interconnection of the reinforcements and socket,

The reinforcements being of mild steel must not be exposed to atmospheric-influences, therefore a more resistant exposed member is provided.

As shown in Figs. 3-5, bars 9 of cast are located at the surface of the concreteand connected to the upper reinforcemente. As

the pots-are usually cast inverted, these bars g provide the required additional *bearing against the bottom of the mould,;to-.position correctly the reinforcements e and 'f and socket a relatively to the mass of concrete forming the pot a.

iron

The bar 9 may be secured as shown in Figs. 3-5 and 7-9 by hooked lugs thereon engaging around the outer hoop bar of the upper reinforcement e, and tied by a :rod h bent beneath a shoulder at each end of the bar .9; this rodh also ties the two reinforcements 6 and 7' together, with the inner end of the socket a interposed .and tied to both.

Alternatively, as shown in Fig. 10, the end of the rod itmay be passed through a hole in the lug of the bar 9.

The bars 9 serveas-abrasion resistingbars beneath :the rail seat. As shown in Figs. 7-9, recesses a maybe provided in the bars 9 ;to" receive pins passed through holes :in

theflange of a rail, forthe purpose Of ,pre-

ventingendways movement or creep of {the latter. 7 Similarly to the abrasionresistingabars g on the upper-surface of thepot a, castgiron bars j-maybe provided at the surfaceof the base of:thepot where exposed toitheimpact of heaters packing ballast beneath :the ,pot.

These bars j are secured ina similar manner.to the bars g Another method of providing ,the additional bearing inthemould, is :by arms or webs, such as 70, extending from the socket c to the surface of the concrete. "The upper reinforcement e engages shoulders on the arms Zc and additionalarms Z;-may extend downwards to engage the dowger reinforcement f. As shown, jlower abrasion "re sisting bars jean also be provided.

.A simplermethodo'f providing the additional bearing in .the .mould ,is shown in Fig. 11. In .this construction the rod :5.

'which interties the upper and lower reinforcements e and f is brought nearly :tothe surface of the concrete and its enjdis covered by a cement or brass .cap m. This cap mensures the correct positioning relatively .to the mould, yet, ,in the finished pot, protects the mildsteel rod h from atmospheric influences.

Figs. .12; and -18show'hoW the jguidesocket c and the reinforcements f and e intertied therewith, can be positioned in the .mould and therefore in themass'of concrete without bringing any member, other than the mouth of thesocket, to the surface of the concrete. To effect this. a recess is pro- Vicled in thelower portion 0 of the mould at-the joint with ;the upper-portion p. The

protruding mouth ofthe socket cisofsuch length and is provided with shoulders '0 ef the socket e v and prevents upwardz canting ofthe outer-end thereof. ,Insmed of or in addition to the block g, a transverse pin walls of the recess a coincident with the transverse hole through the mouth of the socket c for the reception of the cotter (1.

Obviously abrasion bars 9 resting on the surface of the mould and connected to the upper reinforcement e and also the lower abrasion bars y, can be provided, even When the mouth of the socket 0 is held in a re cess n in the mould.

The base of each pot a is preferably so sloped as to relieve the tie bar 6 from excessive stress.

s, Fig. l, are the rails which are secured to the pots a by spikes or screws driven into wooden plug lined holes 6.

I claim:

1. In a concrete sleeper pot, a metallic reinforcement including wear plates at the top and bottom of the pot and a tubular tie bar guide socket exposed at one end only and correlated to and positioned by said reinforcement. s

2. In a concrete sleeper pot, a metallic reinforcenient a tubular tie bar guide socket exposed at one end. only, and exposed atmospheric and abrasionresistant means for positioning said reinforcement and guide socket.

3. In a concrete sleeper pot, a metallic reinforcement, a tubular tie bar guide socket exposed at one end only, and an exposed atmospheric resistant abrasion bar connected to said reinforcement.

4. In a concrete sleeper pot, a metallic reinforcement, a tubular tie bar guide socket exposed at one end only, and atmospheric resistant abrasion bars exposed at the rail seat and base of said pot connected to said reinforcement.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

' DUDLEY HEPBURN STENT.

\Vitnesses E. D. VENABLES, A. N. TAYLOR.

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