阅读说明：本技术 一种客运专线无砟轨道结构快速推移更换施工方法 (Construction method for rapidly pushing and replacing ballastless track structure of passenger special line ) 是由 方登 许国华 王凯 李虎 夏壵 邓林权 吴刚 张亚恒 冯汇慧 雷民 于 2020-05-18 设计创作，主要内容包括：本发明公开一种客运专线无砟轨道结构快速推移更换施工方法,包括采用拆换仰拱结构对病害区域进行整治的过程,分为三个阶段：准备阶段、关键阶段和恢复阶段；所述关键阶段至少包括分段凿除沟槽及道床板、架设钢便梁、铺设木枕轨排、隧道底开挖拆换仰拱及填充层、端部预应力锚固加固、道床浇筑的步骤；在分段凿除沟槽及轨道板中,通过分段、分块的方式将轨道板推移出槽,施工效率高、速度块、安全性好；利用了施工天窗进行作业、铁路运营线施工,考虑到行车安全、施工界限、工艺流程等因素影响,施工方法和步骤安排合理。(The invention discloses a rapid pushing and replacing construction method for a ballastless track structure of a passenger special line, which comprises the process of adopting a disassembled and replaced inverted arch structure to treat a damaged area, and comprises the following three stages: a preparation phase, a key phase and a recovery phase; the key stage at least comprises the steps of chiseling a groove and a track bed board in sections, erecting a steel beam, paving a wood sleeper track panel, excavating and replacing an inverted arch and a filling layer at the bottom of a tunnel, anchoring and reinforcing prestressed force at the end part and pouring the track bed; in the sectional chiseling of the groove and the track plate, the track plate is pushed out of the groove in a sectional and blocking mode, so that the construction efficiency is high, the speed is high, and the safety is good; the construction skylight is utilized for operation and railway operation line construction, the influence of factors such as driving safety, construction boundaries, process flows and the like is considered, and the construction method and the steps are reasonably arranged.)

1. A construction method for rapidly pushing and replacing a ballastless track structure of a passenger dedicated line is characterized by comprising the step of adopting a disassembled and replaced inverted arch structure to treat a damaged area, and comprises the following three stages: a preparation phase, a key phase and a recovery phase;

the preparation stage at least comprises the steps of construction preparation, temporary engineering, lining side wall anchor rod reinforcement, bed slab pin anchoring, steel plate reinforcement, steel rail unlocking and cutting in an operation area, stress dispersion and joint connection;

the key stage at least comprises the steps of chiseling a groove and a track bed board in sections, erecting a steel beam, paving a wood sleeper track panel, excavating and replacing an inverted arch and a filling layer at the bottom of a tunnel, anchoring and reinforcing prestressed force at the end part and pouring the track bed;

the recovery stage at least comprises the steps of groove recovery, original rail reset and fine adjustment, welded steel rail and seamless line recovery, rail fine adjustment and steel rail polishing, field cleaning, completion acceptance check, constant speed recovery, temporary construction channel plugging and post-construction rail state monitoring.

2. The rapid pushing and replacing construction method for the ballastless track structure of the passenger dedicated line is characterized in that the construction preparation comprises the steps of preparing water, electricity, machine tools, materials and personnel before construction, wherein a seamless line displacement observation scale is pasted at the interval of 5-200 m from the two ends of the distance regulation range in advance; the lining side wall anchor rod reinforcement is to adopt an anchor rod to reinforce the lower structures and the strata on the two sides of the tunnel of the reinforcement section, the anchor rod is a hollow grouting anchor rod, and after the anchor rod is tensioned, the slurry is supplemented to the gap between the anchor head of the anchor rod and the free section of the anchor rod; the pin anchors of the track bed boards are that the track bed boards at two ends outside the regulation range are strengthened and connected with the tunnel foundation, the track bed boards at two ends are drilled in a row every other sleeper within a continuous range of 15m, and at least 4 pins are arranged in each row; and the steel plate is reinforced on the inner side of the lining, and the reinforcing is carried out after the construction of the anchor rod is finished.

3. The rapid pushing and replacing construction method for the ballastless track structure of the passenger dedicated line as claimed in claim 1, wherein the temporary engineering comprises the steps of forming a temporary channel, groove moving, drainage of a ditch and cable moving; dredging peripheral drainage facilities and arranging temporary drainage pipes in the process of arranging the temporary channel to prevent surface water from being poured; the grooves are changed into the grooves which are temporarily led and drained through seamless steel pipes respectively embedded in ditches at two sides, and the ditches at two sides use waterproof plugging cement mortar to plug gaps between the side groove walls and the seamless steel pipes; after the groove is constructed again, removing the seamless steel pipe and the plugging mortar, and recovering normal drainage of the side ditch; the drainage of the ditch is to guide the water at the upstream to the downstream and plug the water outlet points of the crack and the inverted arch surface of the ditch; and the cables in the cable grooves on the two sides are changed into cables which are hung on the side walls of the tunnel during construction.

4. The rapid pushing and replacing construction method for the ballastless track structure of the passenger dedicated line as claimed in claim 1, wherein the step of chiseling the groove and the track slab comprises the steps of chiseling the groove, cutting the track slab, and pushing the track slab out of the groove; the process flow of the cutting seam of the track bed plate comprises the steps of cutting area division, fastener dismantling, joint clamping plate dismantling, rail lifting and unloading, partition cutting, rail resetting, rail rechecking fine adjustment, fastener tightening, temporary anchoring and joint cutting waterproof treatment.

5. The rapid pushing and replacing construction method for the ballastless track structure of the passenger dedicated line as claimed in claim 4, wherein the area cutting range for dividing the cutting area is as follows: the D area is a real seam partition area; the area A is a horizontal pushing area, and the longitudinal track plate is removed and chiseled; the area B is a transverse pushing area I, and a symmetrical removing area is integrally and quickly pushed transversely; the area C is a transverse pushing area II, and a symmetrical removing area is integrally and quickly pushed transversely; and completing construction of the area A, the area B and the area C in a circulating construction mode in the step of pushing the track plate out of the groove, wherein the area B is temporarily supported by a mechanical jack or a poured mortar bag, and the area C is supported by installing I-shaped steel longitudinal beams, rubber supports and sleepers when subsection parts are removed.

6. The rapid pushing and replacing construction method for the ballastless track structure of the passenger dedicated line as claimed in claim 1, wherein the tunnel bottom excavation and replacement inverted arch and the filling layer are divided into a plurality of units by a full-width sectional groove jumping regulation method, and each unit is circularly operated for a plurality of times; each circulation comprises the steps of excavating an inverted arch lining, constructing a foundation anchor rod, locally expanding and excavating, cleaning a substrate, replacing and filling, planting ribs, constructing inverted arch reinforcing steel bars, constructing waterproof measures of all seams and pouring concrete in the inverted arch; and carrying out next circulation after the concrete in each circulation reaches the strength.

7. The rapid pushing and replacing construction method for the ballastless track structure of the passenger dedicated line as claimed in claim 1, wherein the track bed pouring is performed by dismantling the overhead line reinforcing system section by using a skylight time, constructing the double-block track slab section by section and recovering the line.

8. The rapid pushing and replacing construction method for the ballastless track structure of the passenger dedicated line as claimed in claim 1, wherein the process flow of the track bed pouring comprises the steps of (1) coarse track adjusting and positioning, (2) paving the steel bar net tied under the line and the assembled double-block concrete sleeper on an inverted arch backfill layer, step (3) installing longitudinal and transverse formworks, step (4) fine track adjusting, and step (5) track bed pouring and maintenance.

9. The rapid pushing and replacing construction method for the ballastless track structure of the passenger dedicated line according to claim 8, wherein the track pouring is segmented construction, the construction is divided into field operation units, and the steps (1) to (4) are repeated until all track bed boards in the renovation area are poured.

10. The rapid pushing and replacing construction method for the ballastless track structure of the passenger dedicated line is characterized in that the whole process of the preparation stage, the key stage and the recovery stage comprises track state monitoring.

Technical Field

The invention relates to the technical field of track construction, in particular to a rapid pushing and replacing construction method for a ballastless track structure of a passenger special line.

Background

High-speed railways are characterized by high speed and high density, and their objectives are high safety and high riding comfort, so that a track structure must have high ride comfort and high stability. The core of high smoothness is to keep the good geometric state of the track structure; high stability refers to the ability of the track to maintain high ride comfort and balanced elasticity, maintaining part availability and integrity under high speed operating conditions. If the stability of the rail is difficult to guarantee, the necessary maintenance or quick replacement must be carried out.

The CRTS I plate-type ballastless track, the CRTS II plate-type ballastless track, the CRTS III plate-type ballastless track, the double-plate ballastless track and the like are widely applied to passenger special lines in China, but some problems such as expansion, cracks, plate breakage, sinking, arching, crack separation, slurry flooding and the like also occur in the use process, and some problems cannot be thoroughly solved by adopting a maintenance method aiming at the problems; the structural integrity of the track bed plate can be ensured only by replacing a ballastless track structure or a sleeper plate.

Because of the high-temperature longitudinal expansion and low-temperature longitudinal contraction of the ballastless track structure or the track plate, and because of the different performances of the materials such as the supporting layer (or the base), the track plate, the sleeper, the fastener, the track and the like, the sensitivity (temperature shrinkage induction) to the temperature is inconsistent, horizontal and vertical stress is generated, and an expansion or crack or broken plate is formed;

in the construction process, loose accumulation exists due to the fact that the top surface of the supporting layer is not cleaned completely; the construction is not in place or the top surface of the supporting layer is used as a construction transportation channel, so that the roughness of the supporting layer is reduced, the bed slab and the supporting layer are not firmly bonded, and a gap is easy to form; the construction temperature of the track bed plate is lower, and a larger temperature force is accumulated in the track bed plate at a high temperature, so that the lower gap of the track bed plate is enlarged, and even the track bed plate is caused to sink and arch;

and the dynamic load of the train also influences the construction, on one hand, concrete particles in and around the gap are crushed to further expand the gap, on the other hand, accumulated water in the gap is squeezed out, and fine particles in the gap are taken out to form track bed board slurry.

In addition, the high-speed railway in China has large transportation capacity and short skylight time; maintenance (or replacement) of a ballastless track structure or a track plate interferes with normal transportation order to form new potential safety hazard; the higher utilization rate of the line is influenced; the contradiction between transportation and maintenance (or replacement) is outstanding, and the popularization and application of the track slab with less maintenance or quick replacement have important significance in the operation period of the passenger special line.

Disclosure of Invention

The invention aims to provide a construction method for quickly pushing and replacing a ballastless track structure of a passenger special line, aiming at the problems in the prior art.

In order to achieve the purpose, the invention adopts the technical scheme that:

a construction method for rapidly pushing and replacing a ballastless track structure of a passenger special line comprises the steps of adopting a process of dismantling and replacing an inverted arch structure and reinforcing a damaged area, and comprises the following three stages: a preparation phase, a key phase and a recovery phase;

the preparation stage at least comprises the steps of construction preparation, temporary engineering, lining side wall anchor rod reinforcement, bed slab pin anchoring, steel plate reinforcement, steel rail unlocking and cutting in an operation area, stress dispersion and joint connection;

the key stage at least comprises the steps of chiseling a groove and a track bed board in sections, erecting a steel beam, paving a wood sleeper track panel, excavating and replacing an inverted arch and a filling layer at the bottom of a tunnel, anchoring and reinforcing prestressed force at the end part and pouring the track bed;

the recovery stage at least comprises the steps of groove recovery, original rail reset and fine adjustment, welded steel rail and seamless line recovery, rail fine adjustment and steel rail polishing, field cleaning, completion acceptance check, constant speed recovery, temporary construction channel plugging and post-construction rail state monitoring.

The construction method adopts a scheme of dismantling and replacing a supporting layer (road) or a base (bridge) and reinforcing a cast-in-place track bed plate structure at an upper arch section of a road (bridge) track, and adopts a scheme of dismantling and replacing an inverted arch structure and reinforcing a tunnel track upper arch section; can be divided into a plurality of circulating construction stages; the span of the steel temporary beam for overhead line is 4.70m, two steel temporary beams are erected at two sections at intervals in each construction stage, and two tunnel bottom replacement sections are constructed in a hop section.

The construction method is suitable for construction sections which are limited in external operation space of an operation line and poor in operation environment and relate to line operation safety, the track plate is divided into blocks by a road cutting machine (water drill) on the premise that driving safety is guaranteed to be the first position, the track plate is separated from the base plate by a rope saw, the track plates between the sleeper blocks are manually chiseled by an air blower matched with a small machine (an area A, a longitudinal track plate is uncovered and chiseled), the track plates at the sleeper block parts are removed by integral pushing (an area B, an integral rapid transverse pushing symmetric removal area, and an area C, an integral rapid transverse pushing symmetric removal area).

In the renovation process, the construction skylight (2-3 hours each time) is comprehensively utilized for operation and railway operation line construction, and the construction tasks are reasonably arranged by considering the influence of factors such as driving safety, construction boundaries, process flows and the like; the monitoring measurement is added in the treatment process, the construction can be adjusted in time when the track structure has large change, and the scheme is modified to ensure the safety.

Further, the construction preparation comprises the steps of preparing water, electricity, machine tool equipment, materials and personnel before construction, wherein a seamless line displacement observation scale is pasted at intervals of 5-200 m from two ends of a distance regulation range in advance; the lining side wall anchor rod reinforcement is to adopt an anchor rod to reinforce the lower structures and the strata on the two sides of the tunnel of the reinforcement section, the anchor rod is a hollow grouting anchor rod, and after the anchor rod is tensioned, the slurry is supplemented to the gap between the anchor head of the anchor rod and the free section of the anchor rod; the pin anchors of the track bed boards are that the track bed boards at two ends outside the regulation range are strengthened and connected with the tunnel foundation, the track bed boards at two ends are drilled in a row every other sleeper within a continuous range of 15m, and at least 4 pins are arranged in each row; and the steel plate is reinforced on the inner side of the lining, and the reinforcing is carried out after the construction of the anchor rod is finished.

Further, the temporary engineering comprises the steps of arranging a temporary channel, groove moving, drainage of a ditch and cable moving; dredging peripheral drainage facilities and arranging temporary drainage pipes in the process of arranging the temporary channel to prevent surface water from being poured; the grooves are changed into the grooves which are temporarily led and drained through seamless steel pipes respectively embedded in ditches at two sides, and the ditches at two sides use waterproof plugging cement mortar to plug gaps between the side groove walls and the seamless steel pipes; after the groove is constructed again, removing the seamless steel pipe and the plugging mortar, and recovering normal drainage of the side ditch; the drainage of the ditch is to guide the water at the upstream to the downstream and plug the water outlet points of the crack and the inverted arch surface of the ditch; and the cables in the cable grooves on the two sides are changed into cables which are hung on the side walls of the tunnel during construction.

Further, the step of chiseling the groove and the track slab in sections comprises the steps of chiseling the groove, cutting a slot on the track slab and pushing the track slab out of the groove; the process flow of the cutting seam of the track bed plate comprises the steps of cutting area division, fastener dismantling, joint clamping plate dismantling, rail lifting and unloading, partition cutting, rail resetting, rail rechecking fine adjustment, fastener tightening, temporary anchoring and joint cutting waterproof treatment.

Further, the area cutting range of the divided cutting area is as follows: the D area is a real seam partition area; the area A is a horizontal pushing area, and the longitudinal track plate is removed and chiseled; the area B is a transverse pushing area I, and a symmetrical removing area is integrally and quickly pushed transversely; the area C is a transverse pushing area II, and a symmetrical removing area is integrally and quickly pushed transversely; and completing construction of the area A, the area B and the area C in a circulating construction mode in the step of pushing the track plate out of the groove, wherein the area B is temporarily supported by a mechanical jack or a poured mortar bag, and the area C is supported by installing I-shaped steel longitudinal beams, rubber supports and sleepers when subsection parts are removed.

Furthermore, the tunnel bottom excavation replacement inverted arch and the filling layer adopt a full-width sectional groove jumping regulation method, a plurality of units are divided, and each unit is circularly operated for three times; each circulation comprises the steps of excavating an inverted arch lining, constructing a foundation anchor rod, locally expanding and excavating, cleaning a substrate, replacing and filling, planting ribs, constructing inverted arch reinforcing steel bars, constructing waterproof measures of all seams and pouring concrete in the inverted arch; and carrying out next circulation after the concrete in each circulation reaches the strength.

Specifically, in the step of excavating, disassembling and replacing the inverted arch and the filling layer at the bottom of the tunnel, the inverted arch and the filling layer are equally divided into six units, after the first unit and the fourth unit of inverted arch lining is removed and replaced, when the design strength is 70%, the steel temporary beam is longitudinally moved by using the skylight time, the line in the range of the second unit and the fifth unit is erected, the line in the range of the first unit and the fourth unit is synchronously recovered by using the wooden sleepers, and then the tunnel bottom structure disassembling and replacing project in the range of the second unit and the fifth unit is constructed; and constructing according to the sequence to finish the dismounting and replacing of the tunnel structure of the third unit and the sixth unit.

Furthermore, the track bed pouring method is characterized in that a circuit overhead reinforcing system is dismantled section by using skylight time, a double-block type track slab is constructed section by section, and a circuit is recovered.

Further, the technical process of pouring the track bed comprises the steps of (1) coarse adjustment and positioning of the track, step (2) laying of the reinforcing mesh tied under the track and the assembled double-block type concrete sleeper on an inverted arch backfill layer, step (3) installation of longitudinal and transverse formworks, step (4) fine adjustment of the track, and step (5) pouring and maintenance of the track bed.

Further, the track pouring is segmented construction, the construction is divided by field operation units, and the steps (1) to (4) are repeated until all the track bed boards in the renovation area are poured.

Further, track state monitoring is included in the whole process of the preparation phase, the key phase and the recovery phase.

Compared with the prior art, the invention has the beneficial effects that: 1. the construction method adopts a scheme of dismantling and replacing a supporting layer (road) or a base (bridge) and reinforcing a cast-in-place track bed plate structure at an upper arch section of a road (bridge) track, and adopts a scheme of dismantling and replacing an inverted arch structure and reinforcing a tunnel track upper arch section; through a plurality of circulating construction stages, the time points of railway skylights are fully utilized, and the rapid replacement of the track slab is completed under the condition that the normal transportation is not influenced; 2. the construction method is suitable for a bridge with limited operation space outside an operation line and poor operation environment and relates to a construction site with safe line operation, the track plate is cut in blocks on the premise of ensuring the driving safety as the first position, the track plate is separated from the base plate in blocks, the track plate among the sleeper blocks is chiseled, the track plate at the sleeper block part is constructed in an integral pushing and removing mode, and the construction efficiency is high, the speed is high, and the safety is good; 3. in the renovation process, the construction skylight is comprehensively utilized for operation and railway operation line construction, the influence of factors such as driving safety, construction boundary, process flow and the like is considered, and the construction method and the steps are reasonably arranged; 4. through the mode of subregion piecemeal, can wholly quick pass out the groove with the track board, practiced thrift the time to support temporarily, do not influence the normal time point operation of train.

Drawings

FIG. 1 is a schematic view of a transition plane (cross section) of K001+ 425- +451 section ditch in the trench changing step in the construction method according to the first embodiment of the present invention;

FIG. 2 is a schematic view of a transition plane (transverse direction) of K001+ 425- +451 section ditch in the trench modification step in the construction method according to the first embodiment of the present invention;

FIG. 3 is a reinforced cross-sectional view of the bolt lining the side wall according to the first embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view illustrating steel plate reinforcement in a construction method according to a first embodiment of the present invention;

fig. 5 is a schematic block diagram of the track slab in the step of pushing the track slab out of the groove in the construction method according to the first embodiment of the present invention;

fig. 6 is a longitudinal section view of a tunnel bottom in a step of excavating and replacing an inverted arch and a filling layer at the tunnel bottom in a construction method according to a first embodiment of the present invention;

fig. 7 is a cross-sectional view of a removal range of a lining inverted arch in a step of excavating a replacement inverted arch and a filling layer at a tunnel bottom in a construction method according to a first embodiment of the present invention;

fig. 8 is a cross-sectional view of a standard inverted arch structure after a lining inverted arch is removed and replaced in a step of excavating a removed inverted arch and a filling layer at a tunnel bottom in a construction method according to a first embodiment of the present invention;

fig. 9 is a reinforcement diagram of a standard inverted arch structure after the lining inverted arch is removed and replaced in the step of excavating and replacing the inverted arch and the filling layer at the bottom of the tunnel in the construction method according to the first embodiment of the present invention;

in the figure: 1. tunnel neutral (line neutral); 2. a top surface of the inner rail; 3. seamless steel pipes; 4. blocking mortar; 5. a drainage steel pipe; 6. reserving holes in the water blocking ridges; 7. the center of the tunnel bottom; 8. a track structure sideline; 9. a trench edge line; 10. water stopping ridges; 11. an anchor rod; 12. a steel plate; 13. anchoring depth; 14. longitudinal grounding steel bars; 15. a ground terminal; 16. connecting reinforcing steel bars; 17. a through ground wire; 18. a region D; 19. a region A; 20. a region B; 21. a region C; 22. a track plate; 23. a support layer; 24. an inverted arch; 25. the actual structure bottom surface line; 26. a first unit; 27. a second unit; 28. a third unit; 29. a fourth unit; 30. a fifth unit; 31. a sixth unit; 32. a dismantling range; 33; changing the filling range; 34. and (5) reinforcing the ribs.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "middle", "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.