What are the characteristics of reinforced concrete sleepers

In real life, this reinforced concrete sleeper is still very useful, and the role is also very large, and some advantages and disadvantages of this reinforced concrete sleeper will be introduced below. In addition to saving a lot of high-quality steel, concrete sleepers also have the advantages of long service life, good track stability, and can meet the requirements of high speed and large volume. It has played a great role in promoting seamless lines.

Its disadvantage is that the stiffness is large, the elasticity is poor, the pressure and vibration acceleration of the track bed are increased, thereby aggravating the pulverization of the ballast, causing the subsidence of the track to increase, and the running part of the locomotive has an adverse effect. For this purpose, tough ballast and elastic cushioning on the sleepers are required.

Reinforced concrete sleepers have a long service life, high stability, small maintenance workload, and the damage rate and scrap rate are much lower than those of wooden sleepers. On seamless lines, reinforced concrete sleepers are on average 15 to 20% more stable than wooden sleepers, making them suitable for high-speed passenger lines.

Summary. Rail fasteners are also known as intermediate coupling parts. Rail fittings for fastening rails and under-rail components.

According to the type of sleeper, it is divided into two categories: wooden sleeper line fastener and concrete sleeper line (other types of concrete under-track component line) fasteners. The standard type of wooden sleeper line fastener is a backing plate and an ordinary road stud fastener.

The pull-out resistance of the road stud is small, and it is easy to float up in the process of driving, causes the backing plate to vibrate, aggravates the wear and tear of the wooden sleeper, for this reason increase the anti-wear cushion layer under the backing plate or use the spring road nail or the threaded road nail instead. In order to increase the longitudinal resistance of the line, the seamless line sleeper section needs to add line anti-climb equipment, or adopt a new type of fastener.

Concrete rail under the component line fastener, must solve the connection mode of road stud and concrete and concrete material rigidity, poor insulation performance and other two aspects of the problem. Buckle rigid fasteners and elastic elastic fasteners are commonly used in China. Between the bottom of the rail and the concrete under-rail component, be provided with the elastic cushion under the rail to improve the elasticity of the vertical direction of the line; The connection mode between the road stud and the concrete rail under-rail component adopts sulfur anchorage.

What are the types of track concrete sleeper fasteners, and what are the components.

Rail fasteners are also known as intermediate coupling parts. Rail fittings for fastening rails and under-rail components. According to the type of sleeper base training, the car is divided into two categories: wooden sleeper line fastener and concrete sleeper line (other types of concrete rail component line) fasteners.

The standard type of wooden sleeper line fastener is a backing plate and an ordinary road stud fastener. The pull-out resistance of the road stud is small, and it is easy to float up in the process of driving, causes the backing plate to vibrate, aggravates the wear and tear of the wooden sleeper, for this reason increase the anti-wear cushion layer under the backing plate or use the spring road nail or the threaded road nail instead. Seamless line sleeper section, in order to increase the longitudinal resistance of the line, need to add line anti-climb equipment, hole or adopt a new type of fastener.

Concrete rail under the component line fastener, must solve the connection mode of road stud and concrete and concrete material rigidity, poor insulation performance and other two aspects of the problem. Buckle rigid fasteners and elastic elastic fasteners are commonly used in China. Between the bottom of the rail and the concrete under-rail component, be provided with the elastic cushion under the rail to improve the elasticity of the vertical direction of the line; The connection mode between the road stud and the concrete rail under-rail component adopts sulfur anchorage.

Hope it helps, dear

Pro, hello briefly describe the limitations of reinforced concrete sleepers There are problems with reinforced concrete sleepers: 1. Fasteners are connected with sleepers, and sulfur anchorage is currently used, due to the inherent slow expansion characteristics of sulfur anchors to form embedded road nail hole cracks, and pollute the environment, now urban rail transit has been replaced by embedded nylon casing. All kinds of damage to sleepers, such as concrete looseness, peeling, splitting, cracking, etc., are generally related to poor manufacturing quality, such as concrete water-cement ratio, external admixture, rebar position, rebar tension, health temperature, etc., and the quality management of manufacturing should be strengthened.

Because the sleeper is a beam placed on the uneven elastic foundation (gravel track bed), different degrees of residual deformation are produced under the action of train load, which will cause the change of the sleeper supporting conditions, and at the same time cause the change of the sleeper stress, therefore, the correct tamping operation is the main influencing factor to improve the stress condition of the sleeper and reduce the damage rate of the sleeper. 2. It is difficult to repair the subgrade bed or the track bed when the slurry is turned in the operation of the reinforced concrete sleeper; Lack of maintenance slag destruction imitation and repair supporting equipment; Wide sleepers are prone to longitudinal cracks and cracks, so strict management of manufacturing, construction and maintenance should be strengthened, so as to give full play to the superiority of reinforced concrete sleepers. Due to the more complex force, the concrete sleeper is more likely to crack in special parts such as ruts, which bear large impact force; The specifications of each group of turnouts are varied, and when individual turnouts are damaged, it is difficult to replace them; When the turnout replaces the rail rail type, the turnout sleeper can not be universal, resulting in the turnout sleeper that has not reached the service life to be removed in advance, and can not give full play to the superiority of the concrete turnout sleeper.

Second, the advantages of reinforced concrete sleepers: reinforced concrete sleepers have long service life, high stability, small maintenance workload, damage rate and scrap rate are much lower than wooden sleepers, on seamless lines, the stability of reinforced concrete sleepers is increased by 15 20% on average than wooden sleepers, therefore, especially suitable for high-speed passenger lines. For example, the Shinkansen in Japan and the high-speed trunk line in Russia are laid on it, of course, the reinforced concrete sleeper also has disadvantages, especially the weight is much larger than the wooden sleeper.

For details, please refer to the relevant content of "Concrete Cement Sleepers are Favored, and the Performance Characteristics Are Further Convex and Visible"] The above content is mainly to tell you about the problems existing in reinforced concrete sleepers, and I hope this section can help you solve some problems.

Concrete sleeper models are divided into type, type, new type and type.

Since 1956, China has developed a prestressed concrete sleeper as of the end of 2002, the total number of concrete sleepers has reached 100 million, accounting for 76 percent of the total number of various types of sleepers, of which 8.37 million sleepers, accounting for 5.2 percent of the total number of concrete sleepers, 96.18 million concrete sleepers, accounting for 59.2 percent of the total number of concrete sleepers, and 69 type sleepers still have 43.6 million, accounting for 32.2 percent of the total number of concrete sleepers, and there are about 10,000 bridge sleepers.

However, due to historical reasons, the bearing capacity of each type of sleeper does not fully match the conditions of the line laid in use, resulting in some sleepers being damaged in advance, and some of the damage is even more severe. Statistics of the autumn inspection of 2002: the damage rate of the type pillow pants, the damage rate of the old type pillow pants, and the loss rate of the type and 69 type pillow injuries are %.

Answer]: C hot-rolled round steel bar is made of carbon structural steel or low-alloy structural steel by hot rolling, its strength is low, but it has good plasticity, high elongation, easy to bend and form, easy to weld and other special buried points, can be used for small and medium-sized concrete structures under the lead of steel bars or stirrups, and as a raw material for cold working (cold drawing, cold drawing, cold rolling). CRB550 is a steel bar for ordinary reinforced concrete.

Cold-drawn low-carbon steel wire shall not be used as prestressed steel bar. The heat-treated steel bar has high strength, low material use, good anchorage, and stable stress reduction of pre-Huai liquid, which is mainly used as a prestressed reinforced concrete sleeper.

Concrete sleeper models are divided into type, type, new type and type.

Since 1956, China has developed a prestressed concrete sleeper as of the end of 2002, the total number of laying concrete sleepers has reached 100 million, accounting for 76% of the total number of various types of sleepers, of which 8.37 million sleepers, accounting for the total number of concrete sleepers, 96.18 million concrete sleepers, accounting for the total number of concrete sleepers, and 69 type sleepers are still 43.6 million, accounting for the total number of concrete sleepers, and there are about 10,000 bridge sleepers.

However, due to historical reasons, the bearing capacity of each type of sleeper is not completely matched with the line conditions laid in use, and the product quality is not satisfactory, resulting in some sleepers being damaged in advance, and some of the damage is even more serious, increasing the maintenance and repair workload, which is not conducive to driving safety. Statistics of the autumn inspection of 2002: the rate of occipital injury of type type, the rate of occipital injury of old type, and the rate of occipital injury of type 69 type.

Sleepers are divided into I, II, III classes according to their carrying capacity, of which type I is used for medium or light tracks; Type II is used for heavy and sub-heavy tracks; Type III is used for extra-heavy rails with 75kg m rails. At present, the main line is generally laid with new pillows and pillows. Due to the different conditions of application of the sleeper, the railway will be used reasonably and graded according to the requirements of different grades of the line in the construction of the new line and the renovation and maintenance of the old line.

The type sleeper is mainly used for heavy-load, speed-increasing railway lines, while the type sleeper is used for general positive lines.

The type has basically been phased out; Type is now the type used by most railways; New type: the improvement of the model is slightly larger in size; It is mainly used for heavy-haul railways; The new type is mainly the change of the eye distance of the guardrail on the bridge sleeper.

The sleeper is the basic component of the track, which is supported under the rail, transmits the pressure of the rail to the track bed, and effectively maintains the gauge and direction geometry of the rail.

Sleepers are divided into three types according to the type of structure: transverse and longitudinal sleepers, short and long rails, and wide sleepers;

According to the laying position, it is divided into three types: ordinary sleepers, turnout rails in turnout areas, and bridge rails;

According to the manufacturing material, it is divided into four types: wooden rails, reinforced concrete sleepers, steel sleepers, and plastic sleepers.

The position on the concrete sleeper that is used to place the rail is called (+).

Concrete sleepers are concrete products used as railway sleepers. The concrete sleeper product made of cement, sand, stone, water and admixture is mixed into a mixture in a certain proportion and injected into the combined model equipped with steel wire or steel bar and sleeper accessories, and is made of vibration forming or loading vibration molding, steam curing, loosening steel wire or steel bar, cutting the end of the sleeper, etc. It has the advantages of saving wood, long service life, laying tracks, less maintenance workload and low cost.

It is significantly better than wood in high-speed, heavy-haul, seamless and other railway applications. According to the structure, it is divided into whole annihilation guess asana, combined type and half pillow; According to the reinforcement mode, it is divided into reinforced concrete sleeper and prestressed reinforced concrete sleeper; According to the prestress application method, it can be divided into pre-tensioning method, post-tensioning method and continuous reinforcement method. According to the stupid gauge, it is divided into 1435mm standard gauge and mm narrow gauge concrete sleepers.

Concrete sleepers and ordinary sleepers differ in terms of use occasions and structural design.

Concrete bridge sleeper is a railway track support facility used for special occasions such as bridges and tunnels. Due to the complex terrain of bridges and tunnels, the foundation conditions are poor, so more solid and durable track support facilities are required. The concrete bridge sleeper is made of concrete, which has strong compressive strength and durability, and can withstand a large amount of impact and vibration force generated when the train is moving.

The ordinary sleeper is a kind of railway track support facility used for good general terrain and foundation conditions. Ordinary sleepers are usually made of materials such as wood, reinforced concrete or plastic, which have strong elasticity and cushioning capacity, which can reduce the damage to the railway track and the train itself when the train is moving.

In short, the concrete sleeper and the ordinary sleeper are different in the use occasions and structural design, and each has its own scope and characteristics.