CN114575204A - Accurate lifting method for turnout of ballastless crossover line for settlement of operating high-speed rail - Google Patents
Accurate lifting method for turnout of ballastless crossover line for settlement of operating high-speed rail Download PDFInfo
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- CN114575204A CN114575204A CN202210287335.0A CN202210287335A CN114575204A CN 114575204 A CN114575204 A CN 114575204A CN 202210287335 A CN202210287335 A CN 202210287335A CN 114575204 A CN114575204 A CN 114575204A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B29/00—Laying, rebuilding, or taking-up tracks; Tools or machines therefor
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
- E01B1/002—Ballastless track, e.g. concrete slab trackway, or with asphalt layers
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2/00—General structure of permanent way
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B29/00—Laying, rebuilding, or taking-up tracks; Tools or machines therefor
- E01B29/04—Lifting or levelling of tracks
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B7/00—Switches; Crossings
- E01B7/10—Frogs
- E01B7/14—Frogs with movable parts
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Abstract
The invention discloses a method for accurately lifting a turnout of a ballastless crossing for settlement of an operating high-speed rail, which comprises the steps of determining the lifting range and the lifting amount of the turnout of the ballastless crossing, and arranging strain gauges and grouting filling holes; grouting lifting holes are arranged in a non-double-line integral structure section of the turnout along the line direction at intervals in a left-right asymmetric zigzag manner; grouting lifting holes are formed in the double-line integral structure section at rectangular intervals; selecting appropriate grouting materials to lift each area according to the points, connections, frog and crossover sections of the turnout; monitoring concrete tensile strain at different positions of the turnout, and adjusting the lifting sequence and height according to the concrete tensile strain to prevent the turnout concrete from cracking; debugging the turnout after lifting is finished, and if the turnout cannot work, carrying out local complementary lifting until the turnout works normally; and after the grouting filling hole is lifted to the target line shape, filling a high-fluidity low-expansibility grouting material into the grouting filling hole. The invention solves the problem of poor control precision of the ballastless crossover turnout lifting, ensures the structural stability of the lifted track, and does not influence the normal work of the turnout and the next-day on-line traffic.
Description
Technical Field
The invention relates to the technical field of high-speed rail line maintenance, in particular to a method for accurately lifting turnouts of ballastless crossover lines for high-speed rail settlement.
Background
In recent years, high-speed railways in China are developed rapidly, the operation mileage breaks through 4 kilometers, and the pressure of passenger traffic in China is greatly relieved. In China, a ballastless track structure is mainly paved on a high-speed railway, and the ballastless track ensures high-speed, stable and safe running of a train by virtue of good integrity and smoothness of the ballastless track, so that the requirements of rapidness and comfortableness of people in traffic trip are met. However, the integrity of the ballastless track structure also limits the repairability of the line smoothness, i.e., the line irregularity can only be repaired within the allowable adjustable range of the fastener system.
Due to the reasons of complex geological conditions, regional uneven settlement and the like, the ballastless tracks of the subgrade and the section of the individual operation line have larger settlement and greatly exceed the adjustable range of a fastener system, particularly for a ballastless crossover turnout structure, the adjustable quantity of the fasteners is smaller, the geometrical state of the tracks is more difficult to repair, a train has to travel at a limited speed, and the high-speed, safe and comfortable operation of the train is directly influenced.
In addition, the patent CN103074828B discloses a system and a method for lifting a sinking track bed of a railway ballastless track by using an injection method, wherein materials are injected into the bottom of the track bed for lifting in a certain sequence through a grouting pipe by equipment, and the elevation is monitored. The patent provides a lifting thought and a grouting sequence of a settlement ballast bed, but key process parameters such as grouting materials, grouting pressure and flow, grouting rhythm and the like are not involved, and the implementation is not strong. In addition, the scheme adopts the process of firstly grouting the curtain and then lifting, so that the problem of the separation of a curtain grouting area is inevitably caused, the structural stress and stability are influenced, the distance between lifting points is small, the cross influence exists, and the lifting precision is not high;
the invention discloses a ballastless track roadbed high polymer grouting lifting method which is only suitable for a common ballastless track line and is not suitable for lifting turnouts which are wider and have higher lifting precision requirements, the lifting force which can be formed by grouting materials is not described, and grouting intervals, grouting sequence and the like are not suitable for lifting turnouts of ballastless cross lines;
the invention discloses a grouting lifting rapid repairing method for a settled ballastless track, which is disclosed in the prior patent CN103410063B, and specifies that grouting lifting holes are arranged in quincuncial piles, are only suitable for lifting a common ballastless track with the width of the ballastless track unchanged along with the length, and are not suitable for lifting a ballastless single turnout with the width of the ballastless track changed along with the length; the grouting material used by the turnout junction lifting device does not have clear lifting force, and the accurate lifting of the turnout junction structure cannot be ensured;
the invention discloses a grouting bag for grouting and lifting a ballastless track and a manufacturing and using method thereof in the prior patent CN104153260B, wherein the grouting bag needs to be placed at the bottom of a ballastless track plate, which is time-consuming and labor-consuming; and for turnouts with wider widths, the operation of plugging the grouting bag becomes more difficult; the method has low lifting precision on the turnout structure;
the invention discloses a lifting device for repairing a differential settlement ballastless track and a construction method thereof, which are disclosed in the prior patent CN113403886A, wherein a connecting rod needs to be arranged in an expansion joint between a normal ballastless track and a ballastless track to be lifted in a penetrating manner, and the lifting device is only suitable for lifting a common ballastless track structure with the expansion joint and is not suitable for lifting a turnout structure without a proper expansion joint for the operation.
In conclusion, as the ballastless crossover turnout is of an asymmetric structure, the ballastless crossover turnout can be stably lifted horizontally, adjacent lifting points are not affected with each other, and the arrangement of grouting lifting holes and the grouting lifting sequence are very critical. Therefore, a method for accurately lifting an operation high-speed rail settlement ballastless crossover turnout is urgently needed to meet the requirement for accurately lifting the ballastless crossover turnout.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the accurate lifting method for the ballastless crossover turnout of the operation high-speed rail settlement, which can effectively solve the problem of poor control on the lifting precision of a special track structure of the ballastless crossover turnout, can also ensure the stability of the track structure after lifting, ensure that the lifting does not influence the normal work and the next-day accurate point traffic of the ballastless crossover turnout, and keep the repairability of the subsequent settlement again.
The invention discloses a method for accurately lifting turnouts of ballastless crossover lines for settlement of an operating high-speed rail, which comprises the following steps of:
determining the lifting range and the lifting amount of a ballastless crossover point, and laying a plurality of strain gauges and a plurality of grouting filling holes at intervals on two sides of the ballastless crossover point;
for the non-double-line integral structure section of the ballastless crossover turnout, a plurality of grouting lifting holes are distributed along the line direction according to the shape of a left-right asymmetrical 'T' -shape with a certain hole interval; for a double-line integral structure section of the ballastless crossover turnout, a plurality of grouting lifting holes are distributed in a rectangular and certain hole intervals along the line direction;
dividing sections according to a switching part, a connecting part, a frog part and a crossover part of the ballastless crossover point, and selecting grouting materials with different expansion lifting forces to be suitable for the sections to lift the sections;
in the lifting process, monitoring the concrete tensile strain conditions of different parts of the ballastless crossover turnout, and adjusting the lifting sequence and the single-point lifting height according to the concrete tensile strain conditions to ensure that the ballastless crossover turnout concrete does not crack;
after the lifting on the same day is finished, operating the ballastless crossover turnout to see whether normal switching can be carried out, if the ballastless crossover turnout cannot normally work, locally supplementing and lifting according to elevation data until the ballastless crossover turnout can normally work;
after the turnout is lifted to a target linear shape, high-fluidity low-expansibility grouting materials are filled into the grouting filling holes, and accurate lifting of the turnout of the settlement ballastless crossover of the operating high-speed rail is completed;
when the line foundation is settled again, the process is repeated, and the ballastless crossover turnout is accurately lifted.
As a further improvement of the invention, the lifting range and the lifting amount of the ballastless crossover turnout are determined by adopting a level gauge or a rail inspection trolley.
As a further improvement of the invention, a plurality of strain gauges are paved on a supporting layer of the ballastless crossover point and two sides of a track bed board of the ballastless crossover point at intervals of not more than 2m along the paving direction of the ballastless crossover point.
As a further improvement of the invention, a plurality of grouting filling holes are paved on two sides of a track bed plate of the ballastless crossover point at intervals of not more than 2m along the paving direction of the ballastless crossover point.
As a further improvement of the invention, the hole spacing of a plurality of grouting lifting holes which are distributed in a shape of a non-bilateral symmetry zigzag is not more than 10m, and the punching depth is more than 1cm after penetrating through the bottom of a turnout supporting layer of a ballastless crossover and entering the surface layer of a foundation bed;
the distance between rectangular corner points of the grouting lifting holes distributed in a rectangular mode is not more than 10m along the line direction, the distance between the rectangular corner points and the line transverse direction is not more than 8m, and the distance between the rectangular corner points and the outer edge of a supporting layer of the ballastless crossover turnout is not more than 0.3 m.
As a further improvement of the present invention, in the process of grouting and lifting the ballastless crossover turnout, the stress-strain of the ballastless crossover turnout structure is detected by the multiple strain gauges to check the influence of lifting on the ballastless crossover turnout structure, which specifically includes:
during grouting and lifting, when the monitored pulling strain generated by the ballastless crossover turnout structure does not exceed the concrete limit pulling strain, the ballastless crossover turnout structure can be continuously lifted to a target through the grouting lifting hole;
when the monitored tensile strain generated by the ballastless crossover turnout structure is close to the concrete ultimate tensile strain, stopping grouting and lifting through a grouting lifting hole close to the measuring point, and grouting and lifting at a grouting lifting hole adjacent to the point until the tensile stress generated by each point does not exceed the concrete ultimate tensile strain after the stress is redistributed;
and repeating the operation until the ballastless crossover turnout line shape reaches the lifting target.
As a further improvement of the invention, for a non-double-line integral structure section in the ballastless crossover turnout, grouting and lifting a triangle formed by a zigzag shape are taken as a lifting unit, two points are lifted along the direction of a line, and then the rest point is lifted;
for the double-line integral structure section in the ballastless crossover turnout, the rectangle is used as a lifting unit for grouting lifting, four corner points of the rectangle are lifted firstly, and then the middle points of the four sides of the rectangle are lifted.
As a further improvement of the invention, for the double-line integral structure section in the ballastless crossover turnout, the grouting lifting takes a rectangle as a lifting unit, and can be lifted at a single point or at multiple points.
As a further improvement of the invention, the expansive force of the grouting materials of the switch part, the connecting part, the frog part and the crossover part of the ballastless crossover point is matched with the self weight of the ballastless track at the corresponding position;
the grouting material is a polyurethane material.
As a further improvement of the invention, the high-fluidity low-expansibility grouting material has an expansion rate of not more than 100% and a curing time of less than 40 s.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, for a non-double-line integral structure section in a ballastless crossover turnout, grouting lifting holes are arranged in a zigzag manner which is not bilaterally symmetrical and has a reasonable hole interval, and on one hand, a triangular structure formed in the zigzag manner can form a stable lifting unit; on the other hand, the lifting points are not affected with each other, the integral lifting of the ballastless crossover turnout structure is realized, and a foundation is laid for ensuring the smoothness of the lifted track structure; for a double-line integral structure section in a ballastless crossover turnout, grouting lifting holes are arranged according to a rectangle, on one hand, the rectangular arrangement holes are more stable for lifting an upper and lower double-line integral structure, and can realize integral lifting of six double-line tracks, thereby being beneficial to lifting linear control, improving the lifting precision of the turnout and ensuring the stability of the track structure after lifting;
the static strain test system is used for carrying out strain test, whether the tensile strain of a crack-free part before lifting in the lifting process exceeds the limit tensile strain of concrete is monitored, grouting of the hole position is stopped if the tensile strain of the crack-free part before lifting exceeds the limit tensile strain of the concrete, the hole is lifted after the hole is lifted until the hole is lifted in place, and the problem that the concrete is prone to cracking when a ballastless crossover point is lifted is solved.
According to the invention, based on the formula differentiation design of grouting materials with different expansion lifting forces, according to the design expansion lifting forces required by the lifting of the switch points, the connection parts and the double-line integral sections of ballastless crossover lines, grouting materials capable of forming different expansion forces are correspondingly selected for lifting different parts of the switches, so that the problems that the lifting force formed by the expansion reaction of the lifting materials adopted in the prior art is uncontrollable and the lifting precision of the lifting materials on the switch structures with continuously changed unit length and weight is poor are solved;
the turnout is operated after lifting is finished on the same day, and if the problem that the turnout sliding bed cannot be switched due to uneven lifting is caused, the line is lifted according to the linear monitoring condition to recover the smoothness of the turnout area and ensure that the turnout mechanism can normally work, so that the problem that the normal switching of the next day line is influenced because the turnout is easy to lose efficacy due to lifting of the turnout is solved.
Drawings
FIG. 1 is a schematic process flow diagram of a method for operating accurate lifting of a ballastless ferry turnout of a high-speed rail settlement disclosed by the invention;
FIG. 2 is a schematic diagram of grouting lifting holes distributed in a shape like the Chinese character 'ji' in a non-double-line integral structural section of the accurate lifting method for operating a ballastless transition line turnout of a high-speed rail disclosed by the invention;
FIG. 3 is a schematic diagram of a rectangular arrangement grouting lifting hole of a double-line integral structure section for operating a high-speed rail settlement ballastless crossover turnout accurate lifting method disclosed by the invention;
FIG. 4 is a schematic diagram of the distribution of the unit length weight of a ballastless crossover turnout in the method for accurately lifting a ballastless crossover turnout in high-speed rail settlement disclosed by the invention;
FIG. 5 is a schematic diagram of grouting materials with different expansive forces for different parts of ballastless crossover points for grouting and lifting the ballastless crossover points by the ballastless crossover point accurate lifting method for high-speed rail settlement disclosed by the invention;
FIG. 6 is a diagram of arrangement of grouting filling hole positions of a non-double-line integral structure section of the accurate lifting method for operating a high-speed rail settlement ballastless crossover turnout disclosed by the invention;
fig. 7 is a schematic diagram of arrangement of grouting filling hole positions of a double-line integral structure section in the method for operating accurate lifting of a ballastless transit turnout of high-speed rail settlement disclosed by the invention.
In the figure:
1. a ballastless crossover turnout; 2. a fastener; 3. a ballast bed plate; 4. a support layer; 5. a strain gauge; 6. grouting lifting holes; 7. and grouting to fill the hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention is described in further detail below with reference to the attached drawing figures:
the invention discloses a method for accurately lifting turnouts of ballastless crossover lines for settlement of an operating high-speed rail, which comprises the following steps of:
determining the lifting range and the lifting amount of the ballastless crossover point 1, and laying a plurality of strain gauges 5 and a plurality of grouting filling holes 7 at intervals on two sides of the ballastless crossover point 1;
for a non-double-line integral structure section of the ballastless crossover turnout 1, a plurality of grouting lifting holes 6 are distributed along the line direction in a left-right asymmetrical zigzag shape at a certain hole interval; for a double-line integral structure section of the ballastless crossover turnout 1, a plurality of grouting lifting holes 6 are distributed in a rectangular and certain hole intervals along the line direction;
dividing sections according to a switching part, a connecting part, a frog part and a crossover part of the ballastless crossover point 1, and selecting grouting materials with different expansion lifting forces to be suitable for the sections to lift the sections;
in the lifting process, monitoring concrete tension strain conditions of different parts of the ballastless crossover turnout 1, and adjusting the lifting sequence and the single-point lifting height according to the concrete tension strain conditions to ensure that the concrete of the ballastless crossover turnout 1 does not crack;
after the lifting on the same day is finished, operating the ballastless crossover turnout 1 to see whether normal switching can be carried out, if the normal switching cannot be carried out, locally supplementing and lifting according to elevation data until the ballastless crossover turnout 1 can normally work;
after the railway turnout 1 is lifted to the target linear shape, high-fluidity low-expansibility grouting materials are filled into the grouting filling holes 7, and the accurate lifting of the ballastless turnout 1 of the settlement high-speed railway is completed;
when the line foundation is settled again, the process is repeated, and the ballastless crossover turnout 1 is accurately lifted.
In the invention, for a non-double-line integral structure section in a ballastless crossover turnout 1, grouting lifting holes 6 are arranged in a shape of Chinese character 'ji' which is not bilaterally symmetrical and has reasonable hole spacing, on one hand, a triangular structure formed in a shape of Chinese character 'ji' can form a stable lifting unit; on the other hand, the lifting points are not affected with each other, the integral lifting of the ballastless crossover turnout 1 structure is realized, and a foundation is laid for ensuring the smoothness of the lifted track structure; for a double-line integral structure section in the ballastless crossover turnout 1, grouting lifting holes 6 are arranged according to a rectangle, so that on one hand, the rectangular arrangement holes are more stable for lifting an upper and lower double-line integral structure, the integral lifting of six double-line tracks can be realized, the linear control of lifting is facilitated, the lifting precision of the turnout is improved, and the stability of the track structure after lifting is ensured;
the static strain test system is used for carrying out strain test, whether the tensile strain of a crack-free part before lifting in the lifting process exceeds the limit tensile strain of concrete is monitored, grouting of the hole position is stopped if the tensile strain of the crack-free part before lifting exceeds the limit tensile strain of the concrete, the hole is lifted after the hole is lifted until the hole is lifted in place, and the problem that the concrete is prone to cracking when a ballastless crossover point is lifted is solved.
According to the invention, based on the differentiated design of the formula of the grouting materials with different expansion lifting forces, according to the design expansion lifting forces required by lifting of the switch part, the connecting part and the double-line integral section in the ballastless crossover point 1, grouting materials capable of forming different expansion forces are correspondingly selected for lifting different parts of the turnout, so that the problems that the lifting force formed by the expansion reaction of the lifting materials adopted in the prior art is uncontrollable and the lifting precision of the turnout structure with continuously changed weight per unit length is poor are solved;
the turnout is operated after lifting is finished on the same day, and if the problem that the turnout sliding bed cannot be switched due to uneven lifting is caused, the line is lifted according to the linear monitoring condition to recover the smoothness of the turnout area and ensure that the turnout mechanism can normally work, so that the problem that the normal switching of the next day line is influenced because the turnout is easy to lose efficacy due to lifting of the turnout is solved.
Specifically, the method comprises the following steps:
the lifting range and the lifting amount of the ballastless crossover turnout 1 are determined by adopting a level gauge or a rail inspection trolley.
Furthermore, a plurality of strain gauges 5 are paved on a supporting layer 4 of the ballastless crossover point and two sides of a track bed plate 3 of the ballastless crossover point 1 at intervals of no more than 2m along the paving direction of the ballastless crossover point 1.
Furthermore, a plurality of grouting filling holes 7 are paved on two sides of the track bed plate 3 of the ballastless crossover point 1 at intervals of not more than 2m along the paving direction of the ballastless crossover point 1.
Furthermore, the hole pitch of a plurality of grouting lifting holes 6 distributed in a shape of a zigzag in a non-bilateral symmetry mode is not more than 10m, and the punching depth is more than 1cm after penetrating through the bottom of a supporting layer 4 of a ballastless crossover turnout 1 and entering the surface layer of a foundation bed;
the distance between rectangular corner points of a plurality of grouting lifting holes 6 distributed in a rectangular mode along the line direction is not more than 10m, the distance between rectangular corner points along the line direction is not more than 8m, and the distance between the rectangular corner points and the outer edge of a supporting layer 4 of the ballastless crossover turnout 1 is not more than 0.3 m.
Further, in the process of grouting and lifting the ballastless crossover line turnout 1, the stress strain of the ballastless crossover line turnout 1 structure is detected through the plurality of strain gauges 5 so as to detect the influence of lifting on the ballastless crossover line turnout 1 structure, and the method specifically comprises the following steps:
when grouting and lifting, when the pulling strain generated by the monitored ballastless crossover turnout 1 structure does not exceed the concrete limit pulling strain, the turnout can be continuously lifted to a target through the grouting lifting hole 6;
when the monitored tensile strain generated by the ballastless crossover turnout 1 structure approaches the concrete ultimate tensile strain, stopping grouting and lifting through the grouting lifting hole 6 close to the measuring point, and grouting and lifting in the grouting lifting hole 6 adjacent to the point until the tensile stress generated by each point does not exceed the concrete ultimate tensile strain after the stress is redistributed;
and repeating the operation until the linear shape of the ballastless crossover turnout 1 reaches the lifting target.
Furthermore, for a non-double-line integral structure section in the ballastless crossover turnout 1, grouting and lifting a triangle formed in a zigzag shape to form a lifting unit, firstly lifting two points along the line direction, and then lifting the rest point; in the invention, each triangle formed by the zigzag forms a stable lifting unit, thereby not only ensuring that lifting points are not influenced with each other, but also realizing the integral lifting of the structure of the ballastless crossover turnout 1. For a double-line integral structure section in the ballastless crossover turnout 1, a rectangle is used as a lifting unit for grouting lifting, four corner points of the rectangle are lifted firstly, and then the middle points of four sides of the rectangle are lifted.
Furthermore, for the double-line integral structure section in the ballastless crossover turnout 1, the grouting lifting takes a rectangle as a lifting unit, and can be carried out by a single point or multiple points; according to the ballastless track structure, each rectangle forms a stable lifting unit, so that the lifting points are not influenced with each other, and the integral lifting of the ballastless track structure is realized.
Further, as the transverse sections of the ballastless cross-over turnouts 1 in the line direction are different, the weights of the ballastless cross-over turnouts are also different in unit length, the expansion force of the required grouting material is different, the expansion force of the grouting material is matched with the self weight of the ballastless track, the design expansion force of the grouting material is determined through matching calculation, and the polyurethane material with the corresponding formula is configured according to the design expansion force, namely, the switch portion, the connection portion, the frog portion and the cross-over portion of the ballastless cross-over turnout are correspondingly lifted by using two different expansion lifting force grouting materials. The expansive forces of grouting materials of a switching part, a connecting part, a frog part and a crossover part of a ballastless crossover point 1 are matched with the self weight of a ballastless track at a corresponding position; the grouting material in the present invention is preferably a polyurethane material.
Furthermore, the expansion rate of the high-fluidity low-expansibility grouting material is not more than 100%, and the curing time is less than 40 s.
Further, the grouting equipment for grouting a plurality of grouting lifting holes 6 is designed in the prior art, and is not described herein again.
Example 1:
after a certain high-speed railway traffic vehicle is operated, the cross-over line turnout 1 has large uneven settlement due to complex geological reasons, the maximum settlement amount is 60mm, the adjustment range of a fastener 2 system of the ballastless cross-over line turnout 1 is exceeded, and the smoothness of a track is influenced. The ballastless crossover turnout 1 with the uneven settlement is lifted and repaired by adopting the technology of the patent so as to recover the smoothness of the track. The process flow is shown in figure 1, and the specific implementation conditions are as follows:
1. determining the lifting range and the lifting amount of the ballastless crossover turnout 1, and laying a strain gauge 5
Specifically, the method comprises the following steps: the method comprises the steps of detecting the line shape of the ballastless crossover turnout 1 by adopting a level gauge, a rail inspection trolley and the like, determining the lifting range and the lifting amount, and arranging strain gauges 5 at intervals of no more than 2 meters with a supporting layer 4 of the ballastless crossover turnout 1 and a track bed plate 3 of the ballastless crossover turnout 1.
2. For a non-double-line integral structure section of the ballastless crossover turnout 1, a plurality of grouting lifting holes 6 are distributed along the line direction according to a left-right asymmetrical 'T' -shape with a certain hole interval; for a double-line integral structure section of the ballastless crossover turnout 1, a plurality of grouting lifting holes 6 are distributed in a rectangular shape along a line direction at certain hole intervals, as shown in fig. 2 and 3;
3. dividing sections according to a switching part, a connecting part, a frog part and a crossover part of the ballastless crossover point 1, and selecting grouting materials with different expansion lifting forces suitable for the sections to lift the sections;
specifically, the method comprises the following steps: dividing sections according to a switching part, a connecting part, a frog part and a crossover part of a ballastless crossover turnout 1, wherein the numbers of corresponding sleepers are respectively 1# -39 #, 40# -88 #, 89# -133 #, 134# -170 #; the point switch part and the connecting part are non-double-line integral turnout 1 areas, the frog part and the cross wire part are double-line integral turnout 1 areas, and the unit length change of calculation is shown in figure 4 along with the gradual increase of the sleeper number.
The cross sections of the ballastless cross-over points 1 in the line direction are different, the weights of the unit lengths of the ballastless cross-over points are different, the expansion force of the required grouting materials is different, when the ballastless track is lifted by utilizing the high polymer expansion force, the expansion force is too small to lift the track structure, the expansion force is too large, the lifting speed of the ballastless track is too high, and the elevation control of the ballastless cross-over points 1 is not facilitated, so when the ballastless cross-over points 1 are lifted, the selection of the expansion force of the grouting materials is also important, and the expansion force of the grouting materials is matched with the self weight of the ballastless track. The length of a ballastless crossover point of 7.2m is taken as a lifting unit, and a full-scale structural test proves that when a ballastless track is grouted and lifted, a circle with an effective lifting area approximate to the radius of 0.4m can be formed within about 20s (surface dry time of polyurethane grouting material expansion reaction), and the formed expansion lifting area is about 0.5024m2, so that the calculated lifting force required for lifting the switch part, the connecting part, the frog part and the crossover part of the ballastless crossover point 1 and the material expansion force adaptive to the lifting force are shown in table 1, namely the switch part, the connecting part, the frog part and the crossover part of the ballastless crossover point 1 corresponding to a grouting material A, B are respectively used. The designed expansion force of the grouting material is calculated and determined by the calculation method, and the polyurethane material with the corresponding formula is configured according to the designed expansion force, as shown in fig. 5.
TABLE 1 lifting force and corresponding material expansive force required for grouting lifting single point lifting of ballastless turnout junction
4. The non-double-line integral type turnout grouting lifting takes a triangle formed by a zigzag shape as a lifting unit, and the double-line integral type turnout grouting lifting takes a rectangle as a lifting unit
Specifically, the method comprises the following steps: as shown in fig. 2, T1, T2 and T3 are grouting lifting holes 6; during grouting lifting, two points are lifted along the line and the rest point is lifted, and the grouting sequence can be T1 → T2 → T3 by taking the example shown in FIG. 2 as an example. As shown in fig. 3, T1, T2, T3, T4, T7, T8, T10 and T11 are grouting lifting holes 6, and T5, T6, T1-4, T2-3, T5-6 and the like are auxiliary grouting lifting holes 6; during grouting lifting, the lifting can be performed point by point, and the lifting can be performed at multiple points in a rectangular shape, as shown in fig. 3 as an example, the grouting sequence can be T1 → T2 → T3 → T4, T1 → T4 → T3 → T2, T1, T2 → T3, T4, T1, T4 → T2, T3, T1, T2, T3 and T4, and the lifting can be performed simultaneously in multiple ways, and then grouting lifting is performed at the auxiliary grouting lifting hole 6 as required. The hole distribution method has the advantages that the triangle formed by the zigzag is used as a lifting unit for non-double-line integral turnout grouting lifting, the rectangle is used as a lifting unit for double-line integral turnout grouting lifting, the mutual influence among lifting points is guaranteed, the integral lifting of the ballastless crossover turnout 1 structure is realized, and the foundation is laid for guaranteeing the smoothness after the track structure is lifted.
5. During lifting, monitoring concrete tensile strain conditions of different parts of a track bed plate 3 of the ballastless crossover point 1, and adjusting a lifting sequence and a single-point lifting height according to the concrete tensile strain conditions to ensure that concrete of the track bed plate 3 of the ballastless crossover point 1 does not crack;
specifically, the method comprises the following steps: ballastless crossover turnout 1 is at slip casting lifting in-process, along with track structure is by the jacking, track structure internal stress changes thereupon, and when track structure stress reached certain limit, the phenomenon of ftractureing probably can appear in track structure to influence track structure's service function. Therefore, in the process of grouting and lifting the ballastless crossover turnout 1, monitoring the stress strain of the ballastless track structure to check the influence of lifting on the ballastless crossover turnout 1 structure; when grouting and lifting, when the pulling strain generated by the monitored ballastless crossover turnout 1 structure does not exceed the concrete limit pulling strain of the track bed plate 3, the ballastless crossover turnout can be continuously lifted to a target through the grouting lifting hole 6; when the monitored pulling strain generated by the ballastless crossover turnout 1 structure is close to the concrete ultimate pulling strain of the track bed plate 3, stopping grouting and lifting through the grouting lifting hole 6 close to the measuring point, and grouting and lifting in the grouting lifting hole 6 adjacent to the point until the pulling strain generated by each point after stress redistribution does not exceed the concrete ultimate pulling strain of the track bed plate 3. And repeating the operation until the track line shape of the ballastless crossover turnout 1 reaches the lifting target.
6. After the lifting on the same day is finished, operating the ballastless crossover turnout 1 to see whether normal switching can be carried out, if the normal switching cannot be carried out, locally carrying out supplementary lifting according to elevation data until the ballastless crossover turnout 1 can normally work;
specifically, the method comprises the following steps: when the ballastless crossover turnout 1 is operated to switch after the completion of lifting on the day, as a result, the switch of the ballastless crossover turnout 1 is abnormal because the lifting height of the 86# to 98# sleeper of the ballastless crossover turnout 1 is slightly insufficient, and after the local compensation of the ballastless crossover turnout 1 in the section is lifted, the ballastless crossover turnout 1 recovers the normal work.
7. After the slurry is lifted to the target linear shape, the encrypted grouting filling hole 7 is filled by adopting a high-fluidity low-expansibility grouting material;
specifically, the method comprises the following steps: after the lifting to the target line shape is confirmed, the grouting filling hole 7 is encrypted, as shown in fig. 6 and 7; and filling the mixture by using a grouting material with high fluidity, expansion rate within 100% and curing time within 40s to recover the bonding between the support layer 4 of the ballastless crossover turnout 1 and the graded crushed stone layer on the surface layer of the foundation bed.
8. When the line foundation settles again, the lifting is still carried out according to the process.
And when the non-smoothness problem of the ballastless crossover turnout 1 occurs again due to the fact that the lower part soft soil foundation and the lower part foundation of the line continue to be unevenly settled caused by the complex reasons of construction close to the existing line and the like, the lifting repair is still carried out according to the process.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides an accurate lifting method of operation high-speed railway settlement ballastless crossover switch, its characterized in that includes:
determining the lifting range and the lifting amount of a ballastless crossover point, and laying a plurality of strain gauges and a plurality of grouting filling holes at intervals on two sides of the ballastless crossover point;
for the non-double-line integral structure section of the ballastless crossover turnout, a plurality of grouting lifting holes are distributed along the line direction according to the shape of a left-right asymmetrical 'T' -shape with a certain hole interval; for a double-line integral structure section of the ballastless crossover turnout, a plurality of grouting lifting holes are distributed in a rectangular and certain hole intervals along the line direction;
dividing sections according to a switching part, a connecting part, a frog part and a crossover part of the ballastless crossover point, and selecting grouting materials with different expansion lifting forces to be suitable for the sections to lift the sections;
in the lifting process, monitoring concrete tensile strain conditions of different parts of the ballastless crossover point, and adjusting the lifting sequence and the single-point lifting height according to the concrete tensile strain conditions to ensure that the concrete of the ballastless crossover point does not crack;
after the lifting on the same day is finished, operating the ballastless crossover turnout to see whether normal switching can be carried out, if the ballastless crossover turnout cannot normally work, locally supplementing and lifting according to elevation data until the ballastless crossover turnout can normally work;
after the turnout is lifted to a target linear shape, high-fluidity low-expansibility grouting materials are filled into the grouting filling holes, and accurate lifting of the turnout of the settlement ballastless crossover of the operating high-speed rail is completed;
when the line foundation is settled again, the process is repeated, and the ballastless crossover turnout is accurately lifted.
2. The method for accurately lifting the ballastless crossover turnout of the operating high-speed rail settlement according to claim 1, wherein the lifting range and the lifting amount of the ballastless crossover turnout are determined by adopting a level gauge or a rail inspection trolley.
3. The method for accurately lifting the settlement ballastless crossover point of the operating high-speed rail according to claim 1, wherein a plurality of strain gauges are laid on a supporting layer of the ballastless crossover point and on two sides of a bed plate of the ballastless crossover point at intervals of not more than 2m along the laying direction of the ballastless crossover point.
4. The method for accurately lifting an operating high-speed rail settlement ballastless crossover turnout according to claim 1, wherein a plurality of grouting filling holes are paved at intervals of not more than 2m on two sides of a track bed plate of the ballastless crossover turnout along the paving direction of the ballastless crossover turnout.
5. The method for accurately lifting the turnout of the settlement ballastless crossover of the operating high-speed rail according to claim 1, wherein the hole pitch of the grouting lifting holes distributed in the shape of a zigzag in a non-bilateral symmetry is not more than 10m, and the punching depth is more than 1cm from the bottom of a supporting layer of the turnout of the ballastless crossover and the surface layer of a foundation bed;
the distance between rectangular corner points of the grouting lifting holes distributed in a rectangular mode is not more than 10m along the line direction, the distance between the rectangular corner points and the line transverse direction is not more than 8m, and the distance between the rectangular corner points and the outer edge of a supporting layer of the ballastless crossover turnout is not more than 0.3 m.
6. The method for accurately lifting the ballastless transition line turnout during the operation of the high-speed rail settlement according to claim 1, wherein in the process of grouting and lifting the ballastless transition line turnout, the stress strain of the ballastless transition line turnout structure is detected through a plurality of strain gauges so as to check the influence of lifting on the ballastless transition line turnout structure, and the method specifically comprises the following steps:
during grouting and lifting, when the monitored pulling strain generated by the ballastless crossover turnout structure does not exceed the concrete limit pulling strain, the ballastless crossover turnout structure can be continuously lifted to a target through the grouting lifting hole;
when the monitored tensile strain generated by the ballastless crossover turnout structure is close to the concrete ultimate tensile strain, stopping grouting and lifting through a grouting lifting hole close to the measuring point, and grouting and lifting at a grouting lifting hole adjacent to the point until the tensile stress generated by each point does not exceed the concrete ultimate tensile strain after the stress is redistributed;
and repeating the operation until the ballastless crossover turnout line shape reaches the lifting target.
7. The accurate lifting method of the ballastless transition line turnout for operating high-speed rail settlement according to claim 1, wherein for a non-double-line integral structure section in the ballastless transition line turnout, grouting and lifting a triangle formed by a zigzag shape is taken as a lifting unit, two points are lifted along a line direction, and then the rest of the points are lifted;
for the double-line integral structure section in the ballastless crossover turnout, the rectangle is used as a lifting unit for grouting lifting, four corner points of the rectangle are lifted firstly, and then the middle points of the four sides of the rectangle are lifted.
8. The accurate lifting method for the turnout of the ballastless transition line for the operation of the high-speed rail settlement according to claim 1, wherein for a double-line integral structure section in the turnout of the ballastless transition line, a rectangular shape is used for grouting lifting as a lifting unit, and single-point lifting or multi-point lifting can be realized.
9. The accurate lifting method of an operating high-speed rail settlement ballastless crossover point according to claim 1, wherein the expansive force of the grouting material of the switch portion, the connection portion, the frog portion and the crossover portion of the ballastless crossover point is matched with the self weight of the ballastless track at the corresponding position;
the grouting material is a polyurethane material.
10. The method for accurately lifting the turnout of the settlement ballastless crossover of the operating high-speed rail according to claim 1, wherein the high-fluidity low-expansibility grouting material has an expansion rate of not more than 100% and a curing time of less than 40 s.
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Application publication date: 20220603 |