DE20207108U1 - Method for lengthways joining of concrete railway sleepers with sprung connectors secured to anchor bolts embedded into the sleepers near to the butting ends - Google Patents

Abstract

A method for end linking concrete railway sleepers has the butting ends fitted with bolts 940 embedded into the concrete. The lower ends of the bolts are flattened to provide a non rotating secure grip. The protruding ends of the bolts are threaded and are linked by a sprung connector secured to the bolts by nuts. The upper ends of the bolts are fitted with wire spirals embedded into the concrete and providing additional support to prevent chipping of the concrete and loosening of the bolts. The sleepers are made of reinforced concrete.

Description

Split concrete long sleeper

The invention relates to a split concrete long sleeper according to claim 1.

Concrete sleepers whose length exceeds the load width of the usual means of transport are also used in switches on railway tracks. In order to be able to transport such long concrete sleepers on normal transport carriers, they are designed as split long concrete sleepers that can be dismantled for transport and reassembled at the installation site. The split long concrete sleepers are usually connected by a vibration-damping connecting piece 5, which is clamped to the two sleepers using so-called through-bolt connections. With such through-bolt connections, a corresponding tube to accommodate a through-bolt is concreted into the end of the sleeper. The tubes of such through-bolt connections must, however, have a relatively large diameter in order to be able to accommodate the through-bolt. The longitudinal tensile forces acting within the sleepers must be guided around the tubes, which can lead to increased transverse tensile forces and the resulting formation of cracks.

The object of the invention is to provide a split concrete long sleeper of the type mentioned above, in which there is a lower risk of cracking.

This object is achieved by a split concrete long sleeper with the features of claim 1. Expedient embodiments and advantageous further developments of the invention are specified in the subclaims.

In the split concrete long sleeper according to the invention, the anchor screw embedded in concrete results in significantly lower transverse tensile forces within the sleepers, so that the risk of crack formation is reduced.

To absorb the connecting forces and to further limit the risk of cracking, concentric reinforcements are cast into the sleepers to the anchor bolts. These

In an advantageous design, reinforcement consists of an inner armor and an outer strapping.

Further features and advantages of the invention will become apparent from the following description of a preferred embodiment with reference to the drawing. They show:

Figure 1 shows the connection area of a split long sleeper in a plan view;

Figure 2 shows a longitudinal section of the connection area of the split long sleeper

along the line II-II of Figure 1 ;

Figure 3 shows a cross-section of the connection area of the split long sleeper along

the line III-III of Figure 1 and

Figure 4 an armour and a strapping in the original and

composite state.

Figures 1 and 2 show the two butt ends of two sleepers 1 and 2 of a split long concrete sleeper for switches on railway tracks. The sleepers 1 and 2, which are designed as prestressed concrete sleepers and are provided with prestressing reinforcement 3, each have a concreted anchor bolt 4 at their butt ends for connection to the other sleeper. The two sleepers 1 and 2 are connected by a vibration-damping connecting piece 5, which is clamped to the two sleepers 1 and 2 via nuts 6 and the two anchor bolts 4.

The anchor bolts 4 shown in Figures 2 and 3 have a lower hammer foot 7 and a shaft 8 with a threaded part 10 protruding over the upper side 9 of the sleepers 1 and 2, respectively. The anchor bolts 4 are concreted into the sleepers 1 and 2, respectively, in such a way that the widened side surfaces 11 of the hammer foot 7 shown in Figure 2 and produced by forming are arranged in the longitudinal direction of the sleeper and the narrower end surfaces 12 shown in Figure 3 are arranged transversely to the longitudinal axis of the sleeper.

On the top side of the sleepers 1 and 2, a circular recess 13 with a defined depth is provided, concentric with the anchor screw 4. Around this recess 13, in the

A reinforcement consisting of an inner armor 14 and an outer strapping 15 is concreted into sleepers 1 and 2, concentric with the anchor bolt 4. The armor 14 shown at the top in Figure 4 consists of a steel wire coil with 2.5 turns and extended ends. The strapping 15 shown below consists of a bent steel ring with overlapping ends. The armor 14 and strapping 15 are assembled as shown in the lower illustration of Figure 4 and welded at the points marked with the triangles. In the welded state, the armor 14 and the strapping 15 are concreted into sleepers 1 and 2.

The vibration-damping connecting piece 5, which is known per se, consists of a base plate 16 and a connecting plate 17, between which an element 18 made of vibration-damping material is arranged. The base plate 16 has a downwardly projecting cam 19 which fits into the recess 13 of one sleeper 2. The base plate also has a hole 20 for placing on the corresponding anchor screw 4. The connecting plate 17 has a cam 21 which fits into the recess 13 of the other sleeper 1 and a hole 22 for the corresponding anchor screw 4 of the other sleeper 1.

When assembling the split concrete long sleeper, the vibration-damping connecting piece 5 is placed over the upwardly protruding parts of the anchor bolts 4 in such a way that the downwardly protruding cams 19 and 21 fit exactly into the recesses 13 around the anchor bolts 4. The vibration-damping connecting piece 5 is then tightened using the anchor bolts 4, disc springs 23 and the nuts 6 with a defined tightening torque.

The stresses in the service condition are transmitted to the concrete sleeper via the vibration-damping connecting piece 5 with its two cams 19 and 21, primarily via the concrete contours around the anchor bolts 4.

Claims (6)

1. Divided long concrete sleeper with at least two concrete sleepers ( 1 , 2 ) which can be connected to one another via a vibration-damping connecting piece ( 5 ), which each have at least one connecting element at their butt ends for fastening the vibration-damping connecting piece ( 5 ), characterized in that the connecting element is an anchor screw ( 4 ) with a hammer foot ( 7 ) embedded in the prestressed concrete sleeper ( 1 , 2 ) and a threaded part ( 10 ) protruding beyond the upper edge ( 9 ) of the concrete sleeper ( 1 , 2 ). 2. Divided concrete long sleeper according to claim 1, characterized in that a concentric reinforcement ( 14 , 15 ) is arranged around the anchor screw ( 4 ) in the concrete sleepers ( 1 , 2 ). 3. Divided concrete long sleeper according to claim 2, characterized in that the reinforcement consists of an inner armouring ( 14 ) and an outer strapping ( 15 ) concentric therewith. 4. Divided concrete long sleeper according to claim 3, characterized in that the armoring ( 14 ) consists of a spiral bent from steel wire with several turns. 5. Divided concrete long sleeper according to claim 3 or 4, characterized in that the strapping ( 15 ) consists of a bent steel ring with overlapping ends. 6. Divided concrete long sleeper according to one of claims 3 to 5, characterized in that the armor ( 14 ) and the strapping ( 15 ) are welded together.