305results about "Track maintainence" patented technology

A Railroad Surveying and Monitoring System configured on a mobile platform for surveying, monitoring, and analyzing rail position and superstructure and terrain substructure of railroad tracks (20a,b) or other structures. The system employs two or more High Accuracy Differential Global Positioning System devices (110,112), ground penetrating radar devices (116), terrain conductivity instruments (118), optical cameras (124), and data receivers and processors (126), which in turn process, display, and store the data in a usable database. Precise coordinate data generated from a High Accuracy Global Positioning System provides both location data for subsurface sensors and surface sensors and rail position coordinates to monitor track displacements during track inspection in real time.

The invention provides a polyurethane resin composition, a preparation method and application thereof. The polyurethane resin composition comprises a component A and a component B, wherein the component A contains polyolein polyatomic alcohol, a plasticizer, an anti-settling agent and other auxiliary agents; the component B is isocyanate or prepolymer of the isocyanate; and the mass ratio of the A to the B is 10:1-1:10. A pouring material containing the resin composition can be used as a patching material for a cement road bed, a boss resin layer and a mortar packing layer of a railway plate-type unballasted track and has the advantages of high water resistance, ageing resistance and low temperature resistance, long service life and capability of being used at a low temperature.

The invention provides an unsaturated resin composition as well as a preparation method and a purpose thereof, wherein the unsaturated resin composition contains a component A and a component B, the component A contains an acrylic resin or a prepolymer thereof, a diluent, a toughening agent, a thixotropic agent and other assistants; the component B contains a peroxide initiator and a plasticizer,and the mass ratio of A to B is 100:1 to 100: 50. The preparation method of the composition is simple and is beneficial to rapid production. A repairing material containing the composition and used as a railway plate type ballastless track cement road bed, a boss resin layer and a mortar filling layer solves the problems of poor water resistance, impact resistance, aging resistance and low temperature resistance existing in the traditional repairing material.

The invention discloses a railroad bed repair method without affecting existing running conditions. The method comprises the following steps of: determining the destroy section position and the destroy type of a bed; drilling grouting holes on two sides of the destroy section bed; determining a grouting method and a grouting material according to the destroy type and the destroy section position; and grouting the grouting material into the bed by using the grouting method through the grouting holes. The construction of the scheme does not occupy the railway running space, does not affect normal running of the railway, and can perform reinforcement from the surface of the bed to the deep place of dozens of meters below the bed. The foundation and the ground surface do not need to be dug during construction, so the method has low labor intensity, high mechanization degree and short construction period, effectively treats frost boiling, sinking, extrusion, freezing injury and the like, improves the bearing capacity of the bed and improves the drainage resistance of the bed.

The invention provides a center line deviation rectifying method for a ballastless track of a high-speed railway of a roadbed segment. The method includes the following steps that the center line deviation amount and settling amount of a ballastless track line are measured; measured data are analyzed, and in combination of the track structure characteristics, lifting points and jacking points are arranged at the lower portion and the side face of a whole roadbed of a ballastless track structure; lifting devices are installed on the lifting points, the whole roadbed of the ballastless track and an upper structure are finely lifted, after an interface between the whole roadbed and graded gravel is jacked to be loosened, the lifting devices are unloaded, and the whole roadbed falls back; jacking devices are installed on the jacking points, and through grouped loading and level-by-level jacking, the ballastless track line is rectified to a designed position; and after line center line deviation rectification is finished, line restoration operation is conducted, a gap in the lower portion of the whole roadbed of the ballastless track is filled with polymer cement mortar, and line smoothness is restored through a fine adjustment fastener system. By the adoption of the method, the problem of center line deviation of the ballastless track line of the roadbed segment can be safely, rapidly and effectively solved within a skylight time, and line smoothness is restored.

The invention discloses a straddle type monorail transportation rigid framework system, and relates to track beams and piers in a straddle type monorail transportation system. In order to increase smooth of lines, reduce the number of monorail transportation track beam expansion joints, eliminate cast steel tension supports, reduce abrasion to rubber wheels and construction cost, and prolong service life of vehicles, the straddle type monorail transportation rigid framework system is designed. The straddle type monorail transportation rigid framework system is composed in a multi-connected rigid frame bridge mode, a rigid frame bridge is formed by connecting concrete track beams which are prefabricated by a workshop on pier bent cap top surfaces through wet joints in a simple support into continuous method, the track beams are prefabricated by the workshop, adjacent two-connected rigid frame bridges are connected through seamless expansion joints or joint plates or plate type rubber expansion joints, and seamlessness of the straddle type monorail transportation lines is achieved.

The invention discloses a system and method for high-speed railway subgrade settlement restoration. The system comprises at least eight lifting components, at least eight hydraulic lifting devices, a hydraulic distribution device, an automatic control system and a grouting device, wherein the at least eight lifting components are arranged at preset lifting points on a base plate, and every lifting component comprises a connecting part and a lifting part; every hydraulic lifting device is arranged between a high-speed railway subgrade and the lifting part of the lifting component; the hydraulic distribution device is connected with every hydraulic lifting device through hydraulic pipelines; the automatic control system controls the hydraulic distribution device to provide preset hydraulic pressure for every hydraulic lifting device so as to lift the base plate to a preset height of the high-speed railway subgrade; and the grouting device pours slurry in gaps formed between the base plate and the high-speed railway subgrade through slurry pipelines so as to support the base plate after the slurry is solidified. The invention further provides a method for track plate and base plate integrated lifting type high-speed railway subgrade settlement restoration.

In a method of surveying a track (9), a first or mobile measuring vehicle (1) and a second or stationary measuring vehicle (2) are placed at a distance apart from one another on a track section to be measured. A reference line (14) is formed by a laser beam emitted from the stationary measuring vehicle (2). At the start of each measuring cycle, by using a GPS receiver (19), the relative position of the stationary measuring vehicle (2) with reference to a fixedly installed GPS reference station (29) located adjacent to the track section is determined, the said GPS reference station being known within a terrestrial coordinate system. The reference line (14) is aligned with the mobile measuring vehicle (1) on the basis of the determined position data, and the track surveying operation is carried out by advancing the mobile measuring vehicle (1) while changes of the actual track position relative to the reference line (14) are registered.

Described herein are methods of improving the durability of concrete by the infusion of the concrete with a low-viscosity oligomeric solution, and subsequent curing of the oligomeric solution to form a high toughness polymer. Also described herein are compositions containing concrete and high toughness polymers, and formed articles made from concrete and high toughness polymers. The methods and compositions are useful for improving the durability of concrete roads and structures, as well as the durability of repairs to concrete roads.

The invention provides a roadbed having a pile-net combination structure and a construction method thereof, which solves the technical problems that soft-soil foundation in superlarge area cannot be treated effectively and post-construction settlement cannot be effectively overcome in the prior art. The roadbed comprises prestress tubular piles (1), prestress tubular pipe caps (2), a prestress tubular pile ground beam (3) and a cushion layer (4), wherein the cushion layer (4) sequentially consists of a first gravel cushion layer (5), a first medium-coarse sand cushion layer (6), a geogrid (7), a second medium-coarse sand cushion layer (8) and a second gravel cushion layer (9) from bottom to top. The thickness of each gravel cushion layer is 25mm, the grain diameter of gravel in the gravel cushion layers is smaller than or equal to 3mm, the silt content of the gravel cushion layers is smaller than or equal to 5%, the thickness of each medium-coarse cushion layer is 5mm, the silt content of the medium-coarse cushion layers is smaller than or equal to 5%, bidirectional tension strength of the geogrid (7) is larger than or equal to 80 kilonewton/m, extension rate of the geogrid (7) is smaller than or equal to 15%, and compacting factor of the cushion layer (4) is smaller than 0.9. The invention further discloses a construction method of the roadbed. The roadbed is low in general manufacturing cost and has excellent economic benefits and popularization value.

The invention provides an auxiliary driving and operating system for a large road maintenance machine for railways. The system comprises a vehicle body, a running and operating video pickup module, a video data switching module and a video display module, wherein the running and operating video pickup module is used for acquiring a running condition of the vehicle body in a running and operating state and a video image of a corresponding key operating part from each predetermined angle; the video data switching module is used for switching the video image acquired by the a running and operating video pickup module to the video display module; and the video display module is used for displaying the image switched by the video data switching module. The system can assist a large road maintenance machine operator in observing the running and operating state of the vehicle body at any time during working and accurately judging the condition of the vehicle body, changes the traditional operating mode of the operator, reduces operation error, equipment damage or personnel injury because the operator cannot directly observe the corresponding key position of the vehicle body, reduces the working strength of the operator, and improves the operating efficiency of the vehicle.

A glyde-rail apparatus removably attached to a carrier such as an excavator to enable the excavator to mount and demount at any point along a railroad track and to travel along the railroad track without damaging the railroad track. The glyde-rail apparatus comprises a front swing arm assembly having a pair of rail wheels which removably attaches to one end of a frame of the excavator and a back swing arm assembly having a pair of rail wheels which removably attaches to a second end of the frame of the excavator. A pair of hydraulic cylinders positioned on the front swing arm assembly and another pair of hydraulic cylinders positioned on the back swing arm assembly enable the rail wheels to be raised or lowered onto the railroad track. A hard rubber cover attaches to the track of the excavator.

The invention relates to a fast production method of track beams and belongs to the technical field of bridge engineering. The production method includes: combining and assembling prefabricated steel box segments (1), prefabricated connecting slabs (2), cast-in-place concrete (3) or prefabricated metal contact surface structures (4), which are designed preliminarily, thus quickly producing track beams which meet the field requirements and which are optional in length, height, curve radius and plane turning angle and optional in wheel-track contact surface linearity and size. The method has the advantages that the track beams different in size and shape can be quickly produced by the production method, and used as the substitute for track beams damaged in operation of straddle monorail transit, or used as a temporary track-beam structure for passage of bridge girder erection machines, on construction sites such as tunnels and deep trenches that a crane approaches with difficulty or at which the crane functions with difficulty during construction of monorail transit systems.

The invention discloses a ballastless track base plate post-cast strip breaking device, system and method, and relates to the technical field of concrete breaking equipment. The device comprises a lateral locking mechanism which is fixed on a rack. The rack is also fixedly provided with a guide shaft, and the rack is further provided with a driving mechanism which slides along the guide shaft anda lifting mechanism which enables the driving mechanism to move up and down. The output end of the driving mechanism is provided with a hollow shaft, and the input end of the hollow shaft is is connected with a rotary joint; and the output end of the hollow shaft is further fixedly provided with a high-pressure spray head, wherein the high-pressure spray head communicates with the interior of thehollow shaft. According to the ballastless track base plate post-cast strip breaking device, system and method, a post-cast strip can be broken without using an oppositely-cover plate, and during theconstruction, a reinforcement cage structure can be maximally retained, so that a concrete structure is removed without damaging reinforcing steel bar, and accordingly the breaking speed of the post-cast strip is improved by 20 times-50 times.

The invention provides a comprehensive maintenance operation car for railways. The invention adopts the following technical scheme: two bogies are arranged below a car body; a hydrodynamic drive device for providing power hangs below the car body; a cab is arranged at the front end of the car body; a maintenance operation material platform is arranged at the rear end of the cab; different operation devices can be installed on the maintenance operation material platform to form the maintenance operation cars with different functions; and the different operation devices mainly include a whole-carriage heavy track car, a permanent way maintenance car, an operation car for contact wire, a bridge inspection car, a high-altitude operation car and the like. The comprehensive maintenance operation car has the following advantages: the comprehensive maintenance operation car realizes the functions of singly transporting the staff and the operation equipment to the operation site and completing relevant maintenance operations and simultaneously can transport the waste materials after operations.

The invention discloses a method for treating cracks at seam positions of CRTS II ballastless track plates. Based on special laws of cracks, the method guarantees the durability of a ballastless track structure by performing special waterproof treatment on cracks. The method for treating cracks comprises the following steps: cutting cracks; treating base surfaces; and pouring low-viscosity polyurethane waterproof material and high-viscosity organosilicon material in the cut cracks. The method is simple in construction, is convenient, economic, durable and reliable, and is suitable for the repairing operation of skylight points of cracks at seam positions of CRTS II ballastless track plates. Through the adoption of the method, the durability of the ballastless track structure can be significantly improved, so that the method is suitable for improving the durability of reinforced concrete structures with a large crack-width variation range.

A method for aligning measured track data collected from a railroad track to correct geographic location information for geometric parameters in the measured track data includes steps for (a) obtaining track geography data for use as reference data in data alignment; (b) reconstructing the track geography data to simulate in form and in coverage of length the measured track data to be aligned; (c) comparing the reconstructed reference data to the measured track data to identify a relative misalignment value between the data types; and (d) using the value identified through comparison to correct the geographic location information contained in the measured track data.

The invention discloses a collapsed loess subgrade base treatment method for a railway with speed more than 200km, and belongs to the technical field of railway construction. The collapsed loess subgrade base treatment method for the railway with speed more than 200km comprises the following steps of 1, using two culverts or two bridges as a construction unit; firstly using a cement soil compaction pile to eliminate the collapsibility of the loess on a foundation in a way of first two sides and then middle part and row separation construction; then, adopting a pipe sinking method to form a hole in the cement soil compaction pile; 2, adopting a CFG (cement flyash gravel) pile to reinforce the foundation, wherein the CFG pile is drilled by a long spiral drilling machine; 3, cleaning the soil between the piles, forming a cement bedding layer, testing and checking, and entering the subgrade body filling procedure after qualification is confirmed. The collapsed loess subgrade base treatment method mainly solves the technical problems that the setting requirement is high, the collapsed loess is generally in the saturation state, and the difficulty in control of settling amount is higher after the construction of the subgrade of the railway with speed more than 200km.

The invention discloses templates for expansion joints of a foundation in a plate type ballastless track. A second-layer template is positioned between a first-layer template and a third-layer template and keeps a distance from both the first-layer template and the third-layer template; the first-layer template and the second-layer template are similar and are both a vertical steel plate which is high on the left, low on the right and provided with a steel plate bent in a running direction in the middle, the lower part of the vertical steel plate is provided with notches, and the upper part of the vertical steel plate is connected with ear plates; and the second-layer template consists of three sections of vertical steel plates which are high on the right, low on the right and disconnected, the middle section is a steel plate bent in the running direction, the left and right sections are flat steel plates, the lower parts of the three sections of vertical steel plates are provided with notches and the upper parts of the three sections of vertical steel plates are connected with ear plates. The invention also discloses a method for constructing the expansion joints of the foundation in the plate type ballastless track. The method contributes to the realization of streamlined construction operation, improves construction efficiency, realizes the accurate control over water drainage counter slopes on two sides of the foundation and ensures the height smoothness of a top face of the foundation.