US2678166A

US2678166A - Reinforced concrete railway sleeper

Info

Publication number: US2678166A
Application number: US133155A
Authority: US
Inventors: Mork Sverre Alfred
Original assignee: Individual
Current assignee: Individual
Priority date: 1949-12-15
Filing date: 1949-12-15
Publication date: 1954-05-11
Anticipated expiration: 1971-05-11

Description

May 11., 1954 s. A. MoRK REINFORCED CONCRETE RAILWAY SLEEPER Filed Dec. 15. 1949 l v Heinrs Patented May 11, 1954 REINFORCED CONCRETE RAILWAY SLEEPER Sverre Alfred Mork, Trondheim, Norway Application December 15, 1949, Serial No. 133,155

(Cl. 23S-84) 1 Claim. l

This` invention relates to a railway sleeper made of reinforced concrete, preferably with an asphalt covering when necessary against alkaline water and poisonous soil. Itconsists of three concrete parts. The third part, which is of cylindrical or the like form, is arranged between the two other parts and together with pads iill up the space between these. The two parts of the sleeper on both sides of said third part are resiliently secured together by members holding a hard-rubber washer.

The invention also provides for improvements as tol the fastening of the rails to the sleeper. These improvements also include arrangements in order to reduce the effect of wheel shocks against the rail joints, particularly in curves, and thereby reduce the stress on the resilient connecting means of the sleeper parts.

`The type of concrete sleepers previously made in two parts is now improved by the three parts system, that gives a double adjusting possibility for widening of the track width at curves.

`The essential features of the present invention are as follows: Each of the two end parts of the sleeper consists of reinforced concrete and are on the transversal sides, which face each other, formed in such a way that they embrace a third part 1of the sleeper, which part has a cylindrical or the like form andis made of concrete. Between the two outer parts of the sleeper, and between each of them and the cylindrical part, are provided pads of perforated sheet metal formed like rasps and with asphaltA paper or other suitable material pressed down and against both sides oi the perforated metal plates. The connecting arrangement between the two end parts of the sleeper comprises longitudinal bolts, which are joined to each other in pairs by means of transverse bolts. The shanks of the top pair of longitudinal bolts may be looped preferably substantially at the middle, while the Shanks of the lower pair of bolts are preferably straight.

According to a feature of the invention transversal eyebolts are screwed into threaded pipes, which pipes are oiled on their inside and are cast into `the end parts of the sleeper. Between the iron washers and the nuts of the longitudinal connecting bolts and the transverse eyebolts are provided washers of hard-rubber or the like to giveexibility. i i

i The fastening of the rails to the sleeper is eifected by means of anchoring bolts whose heads grip across the rails, each bolt being held in a branched socket cast into the sleeper, and having at the end of the bolt a projecting toe which projects under a shoulder of the branch of the socket, preferably under a piece of hard steel Welded to said shoulder and secured there by a lock bolt placed at the back side of the anchoring bolt in the socket. The heads of the bolt grip across the tie plate.

The bolts are interlocked by a cover clinched over their heads, tying them together.

The socket is to be filled with pitch oil which lubricates and prevents formation of rust as well as wear and tear. and makes it easy to replace the bolts.

The bolts for fastening the rails to the sleeper have arrangments to counteract the pressure sideways. For this purpose the head of the anchor bolt on the outer side of the rail is provided with an upward extension which serves as a bearing for a shaft carrying a wheel of hard rubber which thrusts against the web of the rail.

In order to prevent sleepers from sliding along the rails on steep gradients, the anchoring bolts are provided with a set screw and a lock nut, that when tightened hold the sleepers in place relatively to the rails. Between the tieplate and the concrete sleeper is placed a plate which is perforated and formed like a rasp on both sides, on which sides are pressed asphalt paper or the like material.

Each of the outer parts is provided with reinforcing members for prestressing the concrete.

The above described railway sleeper has essential advantages:

Owing to the third cylindrical concrete part between the outer parts of the sleeper, adjustment of the distance between the rails in curves can easily be performed by dividing the difference in rail gauge by one half on each of the outer parts of the sleepers. The spaces between each of the outer parts and the cylindrical part of the sleeper are lled with pads, as mentioned above.

The parts of concrete sleeper will be held in proper place. The stresses on the connecting bolts and sleeper parts are likewise reduced by the flexible arrangement of the hard-rubber washers and the hard-rubber wheel against the rails.

By making the sleeper in the way described the production may be simplied, as each of the j outer parts of the sleeper are alike, an advantage not obtained when the parts are made with key and slot. As the transverse eyebolts are screwed into oil pipes and because of the washers of hardrubber between the nuts of the longitudinal bolts andthe transversal eyebolts, easy replacement of Fig. 3 shows details of the three main parts of the sleeper, with the pads andthe pipes, that are moulded into the end parts of the sleeper.

Fig. 4 shows in perspective said pads and the cylindrical part of the sleeper, whichistobe embraced by the pads.

Fig. 5 shows in detail the transverse members consisting of the pipes with inside threadsftobe Y cast into the end parts of the sleeper, and the eyebolts to be screwed into the pipes.

Fig. 6 is an enlarged sectional View vof theanchorage bolts and the rail with the rail'tie-plate. The figure also-shows the arrangement to countei-act the pressure sideways of the train.

Fig. 7 shows in detail a planview of the pad used between the sleeper andthe rail tie-plate and which consists of a plate of sheet'metaLperforated and formed like a rasp, against the sides of which is pressed asphalt paper or similar material.

Fig. 8 is a detail view of the hard rubber washer. The reference. letters a and b indicate the two outer or end concrete parts of the sleeper and c the cylindrical concrete part, which is placed between the parts a and b. 'Between a and b respectively and between each of these parts and part c are provided pads, each consisting of plates d1 and e1, see Fig. 4, part of which has a half cylindrical profile to lt into half cylindrical recesses in the parts a and b and to embrace part c. The plates. di and e1 are perforated and serrated around the holes, so that both sides of the plates become similar to a rasp. Asphalt paper or other suitable material dz and e2 respectively is pressed against each side of the plates.

The longitudinal bolts which interconnect the outer or end parts of the sleeper consist of the numbers il and f2, which in their middle'part are looped, and of the numbers g1 and g2 which are straight. The bolts f1 and f2 interconnect the sleeper parts a and b by means of theeyebolts h1 and h2, each of which is screwed into a transverse and threaded pipe'k, moulded into part a, and further by means of the eyebolts 7'1 and i2, each screwed into another ppela'moulded into sleeper part b. The pipes 1c are lled with pitch oil and handy replacements of the eyebolts, if desired. Nuts` Z hold the longitudinal bolts to the transverse eyebolts.

Between each of the eyebolts jrandy'z and the nut l on the respecting longitudinal bolt is a` washer m made of hard-rubber, andalso a steel washer n. The bolts gi and g2 connect .the parts a and b by means of the eyebolts o1 and o2 and p1 and p2 screwed into pipes lc. Each 'of the eyelets 01 and oz is provided with a square hole which isengaged by a square portionat the end ofthe respecting tie bolts g1 and g2, each .of which is provided with a head q placed against the outside of the eyebolts. Each of the-bolts g1 and g2 is threaded on the opposite endand carries attaching nuts Z for securing to the eyebolts p1 and p2. As for the upper pair of bolts, Va lrubber 4 washer m. and a steel washer n are placed in between each of the eyebolts 101 and p2 and nut Z on the longitudinal bolt g1 and g2 respectively.

Between each of the rails c and the sleeper are placed an ordinary tie plate w and a pad ai, which pad, as above mentioned, consists of a perforated and raspformed sheet metal plate with asphalt paperpressed against both sides. The anchoringlof the Yrails .to the sleeper is such that vertical branching sockets are moulded into the sleeper and arranged for receiving a projection or bending of the bolt r or a: respectively, which Vbolts-connect `the rails with the sleeper. Each of the sockets also receives a lock bolt z' connected with the anchoring bolt by means of a cover a2. whichispressed down upon the heads of the anchoringboltandithe lockbolt, thus securing the bolts.

To counteract the sideways pressure on the rail from the train, the outer anchor bolt r (see Fig. 6) is provided with an arm s which carries a bearing for a shaft t, carrying a wheel u of hard-rubber or similar material, which the wheel vthrusts against the web of the rail o. In order to hold the `sleeper and the rail together with a tight grip, the anchoring bolts 'throughthe headare providedv witha set screw y and a lock nut, which will press the toe a: of the anchoring bolt-against the steel plate .e of the socket ae.

Letter indicates the reinforcing members, used to obtain the pre-stressed concrete structure.

I claim:

A rail anchoring device for securing a rail to a tie having a vertical bore therein formed with a laterally enlarged lower portion defining a downwardly facing inclined shoulder; said anchoring device comprising an anchoring bolt havingr a head extending laterally y,from one end for overlying the `base flange of a rail onthe tie and alaterally extending inclined toe projection on the other end formed to extend loosely through the vertical bore and to underlie the inclined shoulder in parallel relationship to the latter, a locking bolt having a shank dimensioned to extend into the vertical bore alongside said anchoring bolt and'to fill the bore for preventing lateral movement of `said anchoring bolt in the bore, a clamping bolt extending threadedly down through said head of the anchoring bolt for bearing at itslower end against the base iiangeof the secured rail to thereby urge said inclined toe projection into bearing engagement with the downwardly facing inclined shoulder so that the bearing engagement of the inclined toe projection and shoulder causes the anchoring bolt to'bear laterally against said locking bolt and prevent removal of the latter from the bore, an arm projecting upwardly from said head of the anchoring bolt, and a roller member mounted on the upper end ofsaid arm for engagement against the web of thesecured rail to resist outward lateral rolling movement of the latter.

vReferences Cited in the file of this patent Falk Feb. 24, 1925