CN110670419A - Method for renovating waterproof and drainage structure of ballastless track roadbed - Google Patents
Method for renovating waterproof and drainage structure of ballastless track roadbed Download PDFInfo
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- CN110670419A CN110670419A CN201911002693.7A CN201911002693A CN110670419A CN 110670419 A CN110670419 A CN 110670419A CN 201911002693 A CN201911002693 A CN 201911002693A CN 110670419 A CN110670419 A CN 110670419A
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- 238000009418 renovation Methods 0.000 claims description 3
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Classifications
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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
- E01B1/008—Drainage of track
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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
- E01B37/00—Making, maintaining, renewing, or taking-up the ballastway or the track, not provided for in a single one of groups E01B27/00 - E01B35/00
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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
- E01B2204/00—Characteristics of the track and its foundations
- E01B2204/07—Drainage
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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
- E01B2204/00—Characteristics of the track and its foundations
- E01B2204/11—Embedded tracks, using prefab elements or injecting or pouring a curable material
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Railway Tracks (AREA)
Abstract
The application provides a method for renovating a waterproof and drainage structure of a ballastless track subgrade, which comprises the following steps: chiseling a first closed layer and a first-stage crushed stone layer in the area between the ballastless track lines; excavating a working well in the inter-line area, transversely jacking a drainage assembly into the bottom layer of the foundation bed of the roadbed, and filling gaps at the periphery of the drainage assembly; arranging a water collecting well in the working well, wherein the drainage assembly is communicated with the water collecting well so as to drain liquid in the water collecting well out of the ballastless track; pouring concrete on the surface layer of the foundation bed of the roadbed avoiding the water collecting well in the inter-line area to form a second closed layer, wherein the height of the second closed layer is lower than that of the supporting layer of the ballastless track; sealing the caulk between the second closure layer and the support layer. The technical problem of the drainage effect that current ballastless track road bed high closed waterproof and drainage structure exists is not good is solved.
Description
Technical Field
The application relates to the field of geotechnical engineering, in particular to a method for renovating a waterproof and drainage structure of a ballastless track roadbed.
Background
Referring to fig. 1, the conventional ballastless track 100 ' includes a support layer 110 ' and a track slab 120 ' located above the support layer 110 ', and the roadbed waterproof and drainage structure of the ballastless track 100 ' includes a high-closure waterproof and drainage structure, which includes: the first-stage gravel layer 1 ' arranged above the foundation bed 200 ' in the area between the ballastless tracks 100 ' and the first sealing layer 2 ' arranged above the first-stage gravel layer 1 ', the height of the first sealing layer 2 ' is higher than that of the track slab 120 ', the second-stage gravel layer 3 ' is arranged on the road shoulder, the third sealing layer 4 ' is arranged above the second-stage gravel layer, and the height of the third sealing layer 4 ' is higher than that of the track slab 120 '. By the design, water liquid in the inter-line area is transversely discharged from the upper surface of the first sealing layer 2', and the normal operation of the high-speed rail is seriously influenced due to poor water discharging effect, so that hidden danger is brought to the safe operation of the high-speed rail.
Disclosure of Invention
In view of this, an embodiment of the present application is expected to provide a method for renovating a waterproof and drainage structure of a ballastless track subgrade, which solves the technical problem of poor drainage effect existing in the existing ballastless track subgrade highly-closed waterproof and drainage structure, and in order to solve the technical problem, the technical scheme of the embodiment of the present application is implemented as follows:
the embodiment of the application provides a method for renovating a waterproof and drainage structure of a ballastless track subgrade, which comprises the following steps:
chiseling a first closed layer and a first-stage crushed stone layer in the area between the ballastless track lines;
excavating a working well in the inter-line area, transversely jacking a drainage assembly into the bottom layer of the foundation bed of the roadbed, and filling gaps at the periphery of the drainage assembly;
arranging a water collecting well in the working well, wherein the drainage assembly is communicated with the water collecting well so as to drain liquid in the water collecting well out of the ballastless track;
pouring concrete on the surface layer of the foundation bed of the roadbed avoiding the water collecting well in the inter-line area to form a second closed layer, wherein the height of the second closed layer is lower than that of the supporting layer of the ballastless track;
sealing the caulk between the second closure layer and the support layer.
Further, the drainage assembly comprises a sleeve and a drainage pipe sleeved in the sleeve.
Furthermore, the side wall of the sleeve is provided with a slurry leakage hole.
Further, the step of excavating a working well in the inter-line area, transversely jacking a drainage assembly into the bottom layer of the foundation bed of the roadbed, and filling gaps at the periphery of the drainage assembly comprises the following steps:
arranging a bracket between the sleeve and the drain pipe to separate the sleeve and the drain pipe;
plugging a gap between the end part of the sleeve and the bottom layer of the foundation bed to form a first plugging layer, plugging a gap between the end part of the drain pipe and the end part of the sleeve to form a second plugging layer, and forming a grouting hole and an exhaust hole on the first plugging layer or the second plugging layer;
and injecting slurry from the grouting holes until the slurry completely fills the gaps at the periphery of the drainage assembly, and blocking the grouting holes and the exhaust holes.
Further, the support is arranged between the sleeve and the drain pipe at intervals;
and/or the length of the sleeve is 40 cm-60 cm;
and/or the grouting hole and the exhaust hole are arranged on the first plugging layer or the second plugging layer far away from the working well.
Further, concrete is poured on the surface layer of the foundation bed of the roadbed, which is avoided from the water collecting well, of the inter-line area to form a second closed layer, and the step that the height of the second closed layer is lower than that of the supporting layer of the ballastless track comprises the following steps: and reserving a ditch in the inter-line area, wherein the ditch is communicated with two adjacent water collecting wells.
Furthermore, the ditch is a longitudinal slope of 0.1-0.5%.
Further, the remediation method comprises:
chiseling a third sealing layer and a second-stage crushed stone layer of a road shoulder of the ballastless track;
and pouring concrete on the road shoulder to form the fourth closed layer, wherein the height of the fourth closed layer is lower than that of the supporting layer.
Further, the fourth sealing layer is 3% -6% of a cross slope.
Further, an end of the second sealing layer adjacent to the support layer is higher than an end of the second sealing layer adjacent to the gutter.
According to the method for renovating the waterproof and drainage structure of the ballastless track subgrade, the water collecting well is arranged in the area between lines, the drainage assembly is transversely jacked into the foundation bed, the drainage assembly is quickly arranged on the basis that the original ballastless track is not damaged, and the renovation of the waterproof and drainage structure of the subgrade can be quickly realized within the time of a skylight. The drainage prevention structure of the ballastless track subgrade is constructed, liquid in the ballastless track and in the peripheral area is collected to the water collecting well, the liquid in the water collecting well is discharged out of the ballastless track through the drainage assembly, the liquid is prevented from being accumulated on the ballastless track, drainage is rapid, and the drainage effect is good. The second seal prevents the infiltration of liquids into the subgrade through the earth's surface. Because the height of the second sealing layer is lower than that of the supporting layer of the ballastless track, the defects of gap, white slurry emission, slurry leakage and mud emission of the surface layer of the foundation bed and the like at the junction of the supporting layer and the track slab can be conveniently found in time, and the treatment is easy.
Drawings
Fig. 1 is a schematic cross-sectional view of a waterproof and drainage structure of a ballastless track subgrade in the prior art;
fig. 2 is a flowchart of a method for renovating a waterproof and drainage structure of a ballastless track subgrade in an embodiment of the application;
fig. 3 is a schematic cross-sectional view of a waterproof and drainage structure of a ballastless track subgrade in an embodiment of the application;
FIG. 4 is a cross-sectional view of a drainage assembly in the bottom layer of a foundation bed in an embodiment of the present application;
fig. 5 is a flowchart of another method for renovating a waterproof and drainage structure of a ballastless track subgrade in the embodiment of the application.
Reference numerals: a ballastless track 100; a support layer 110; a track plate 120; a bed bottom layer 210; a bed skin 220; a drain assembly 10; a sleeve 11; a drain pipe 12; a bracket 13; a water collection well 20; a second sealing layer 30; a gutter 40; a fourth sealing layer 50; a working well 300; a grouting hole 400; and an exhaust hole 500.
Detailed Description
The present application will now be described in further detail with reference to the accompanying drawings and specific examples. In the description of the present application, "inter-line area" refers to an area between two ballastless tracks, "cross slope" refers to a transverse slope of each component of ballastless track roadwidth and trackside belt, "longitudinal slope" refers to a longitudinal slope of the extending direction of ballastless track, "up" and "down" orientation or position relationship is based on the normal use state of ballastless track, such as the orientation or position relationship shown in fig. 3, "cm" refers to international unit centimeter, it should be understood that these orientation terms are only used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as limiting the present invention.
Referring to fig. 2 and 3, an embodiment of the present application provides a method for renovating a waterproof and drainage structure of a ballastless track subgrade, including:
s01, chiseling a first closed layer and a first-stage gravel layer in the area between ballastless track lines;
s02, excavating a working well in an on-line area, transversely jacking a drainage assembly into the bottom layer of the foundation bed of the roadbed, and filling gaps at the periphery of the drainage assembly;
s03, arranging a water collecting well in the working well, and communicating the drainage assembly with the water collecting well so as to discharge liquid in the water collecting well out of the ballastless track;
s04, pouring concrete on the surface layer of the foundation bed of the roadbed avoiding the water collecting well in the inter-line region to form a second closed layer, wherein the height of the second closed layer is lower than that of the supporting layer of the ballastless track;
and S05, sealing the caulking joint between the second closing layer and the supporting layer.
In the prior art, a ballastless track adopts a highly-closed drainage structure, referring to fig. 1, serious diseases such as slurry pumping between a first closed layer 2 'and a track plate 120', mortar separation between the track plate 120 'and a supporting layer 110', damage and crack separation of a mortar layer (not shown) and the like often occur, and the cause of the disease is often difficult to find after the disease occurs, so that the renovation is difficult. The expansion joints and gaps of the ballastless track are usually closed by adopting a silicone caulking method, and subsurface infiltration of surface water is difficult to isolate. The reason for this is that the drainage of the high-sealed drainage structure is not smooth, rainwater easily enters the first sealing layer 2 ', and since the height of the first sealing layer 2 ' is higher than that of the track slab 120 ', small diseases generated in a short time often cannot be found through line investigation, so that serious water accumulation in the first sealing layer 2 ' gradually occurs, and under the high-speed load impact vibration of a train, serious diseases such as slurry turning and mud pumping between the first sealing layer 2 ' and the track slab 120 ', mortar separation between the track slab 120 ' and the supporting layer 110 ', mortar layer damage, crack separation and the like gradually occur, and on the other hand, since the height of the first sealing layer 2 ' is too high, the above-mentioned diseases are not easy to treat.
In the embodiment of the application, an electric pick or an air pick matched with an air compressor can be used for chiseling a first sealing layer 2 ' and a first-stage crushed stone layer 1 ' (please refer to fig. 1) of the existing ballastless track high-sealing waterproof and drainage structure, and a thicker part of the first sealing layer 2 ' can be cut into blocks by a cutting machine and then chiseled, and an output line is transported by a flat car or a trolley.
Referring to fig. 3, a working well 300 is excavated in the inter-line area for subsequent construction operations. The drainage assembly 10 is transversely jacked into the foundation bed bottom layer 210 of the roadbed, specifically, the drainage assembly 10 is transversely jacked into the foundation bed bottom layer 210 from the working well 300 by using a miniature pipe jacking device, and the drainage assembly 10 can also be jacked into the foundation bed bottom layer 210 from the side of the foundation bed bottom layer 210 far away from the inter-line area by using the miniature pipe jacking device. The roadbed comprises a foundation bed surface layer 220 and a foundation bed bottom layer 210, the foundation bed surface layer 220 bears the dynamic stress generated by train load and is large, and the arrangement of the drainage assembly 10 on the foundation bed bottom layer 210 is beneficial to maintaining the structural stability of the drainage assembly 10 and is also beneficial to maintaining the structural stability of the roadbed. In addition, in some embodiments, the foundation bed surface layer 220 includes graded broken stones, in which case, since the graded broken stones have greater strength, the drainage assembly 10 is disposed on the foundation bed bottom layer 210, and the drainage assembly 10 can be rapidly disposed into the foundation bed bottom layer 210 without damaging the original ballastless track 100, so that the treatment of the waterproof and drainage structure of the foundation bed can be rapidly realized in the skylight time. Filling the gap around the drainage assembly 10 prevents the gap around the drainage assembly 10 from becoming a communication channel for the groundwater and other liquids, and also serves to stabilize the drainage assembly 10.
The water collecting well 20 is arranged in the working well 300, the water collecting well 20 can be cast in situ by adopting a template containing reinforcing steel bars, and can also be prefabricated in advance, and the construction time can be saved by adopting the water collecting well 20 prefabricated in advance. The drainage assembly 10 is communicated with the water collecting well 20, so that a water outlet (not shown) communicated with the drainage assembly 10 can be reserved in the manufacturing process of the water collecting well 20, a water outlet can be formed in the water collecting well 10 after the water collecting well 20 is manufactured, liquid in the water collecting well 20 is discharged out of the ballastless track 100 from the drainage assembly 10 through the water outlet, and the liquid is prevented from being accumulated on the ballastless track 100 to affect the safety of the ballastless track 100.
Concrete is poured on the surface layer 220 of the foundation bed of the water collecting well 20 avoiding the inter-line areas to form a second closed layer 30, and the second closed layer 30 plays a waterproof role and prevents liquid from the ballastless track 100 from permeating into the foundation bed. The height of the second sealing layer 30 is lower than that of the supporting layer 110 of the ballastless track 100, so that the liquid of the ballastless track 100 is collected to the water collection well 20 and discharged through the water collection well 20. Specifically, the second closing layer 30 may be formed using fiber concrete casting.
Sealing the caulk between the second closure layer 30 and the support layer 110, comprising: the caulking joint between the second sealing layer 30 and the supporting layer 110 is cleaned, an antifouling adhesive tape is adhered to the adjacent area at the periphery of the caulking joint, the antifouling adhesive tape can be needless, the antifouling adhesive tape is used for preventing an interface agent and a sealing material from polluting the adjacent area at the periphery of the junction, the interface agent is coated on the surface of the caulking joint, the interface agent can be needless, the interface agent is used for improving the surface performance of the junction, the sealing effect of the sealing material is better realized, the caulking joint is filled with a filler, the filler is a material with a waterproof sealing effect, such as a silicone sealant or a polyurethane sealant, liquid is prevented from entering the second sealing layer 30, the supporting layer 110 and/or a roadbed from the caulking joint, and the antifouling adhesive tape is dismantled.
The method for renovating the waterproof and drainage structure of the ballastless track subgrade provided by the embodiment of the application has the advantages of simple construction method, high construction efficiency and short construction period, and is convenient for completing construction in a skylight period. The formed water-proof and drainage structure of the ballastless track subgrade is constructed, liquid in the ballastless track 100 and in the peripheral area is collected to the water collecting well 20, the liquid in the water collecting well is discharged out of the ballastless track 100 through the drainage assembly 10, the liquid is prevented from being accumulated on the ballastless track 100, the drainage is rapid, the drainage effect is good, the second sealing layer 30 prevents the liquid from penetrating into the subgrade through the earth surface, and therefore serious diseases such as slurry pumping between the first sealing layer and the track plate 120, mortar separation between the track plate 120 and the supporting layer 110, mortar layer damage, gap and the like are avoided. On the other hand, the height of the second sealing layer 30 is lower than that of the supporting layer 110 of the ballastless track 100, so that whether the joint between the supporting layer 110 and the track slab 120 has the defects of gap, white slurry leakage, slurry overflow and mud leakage of the surface layer of the foundation bed, and the like, can be found in time, and the treatment is easy.
In one embodiment of the present application, referring to fig. 4, a drainage assembly 10 includes a casing 11 and a drainage pipe 12 sleeved in the casing 11. Because the drainage assembly 10 needs to be transversely jacked into the foundation bed 210, the sleeve 11 with stronger stress capacity is firstly jacked into the foundation bed 210, and then the drainage pipe 12 for drainage is sleeved in the sleeve 11. Specifically, a drill hole is drilled in the foundation bed bottom layer 210 through a drill rod of the micro pipe jacking device, the casing 11 is detachably connected to the micro pipe jacking device, the casing 11 is jacked into the drill hole through the micro pipe jacking device, the casing 11 and the micro pipe jacking device are separated, and the casing 11 is left in the drill hole, so that the casing 11 is left in the foundation bed bottom layer 210. The jacket 11 may also be used later to withstand the earth pressure, water pressure and road traffic loads from the subgrade to maintain the structural strength of the drainage assembly 10. In one embodiment, the casing 11 may be a metal pipe, such as a galvanized steel pipe, a copper pipe, etc., and has a strong structural strength, so as to not only support the compressive stress and the bending moment, but also to transversely push the casing 11 into the bed bottom layer 210. The drain pipe 12 may be an organic polymer pipe such as a polyvinyl chloride pipe, a polyethylene pipe, or a high-density polyethylene pipe, and the above structure is inexpensive in cost and has a long service life.
In an embodiment of the present application, referring to fig. 4, a slurry leaking hole (not shown) is formed on a sidewall of the sleeve 11. The slurry can enter the gap between the sleeve 11 and the foundation bed bottom layer 210 and the gap between the sleeve 11 and the drain pipe 12 through the slurry leakage holes, so that the gap between the sleeve 11 and the foundation bed bottom layer 210 is prevented from being a flow channel of underground water, the grouting process can be reduced, and the construction period is shortened.
In an embodiment of the present application, referring to fig. 2, S02, the step of excavating a working well in an inter-line area, transversely jacking a drainage assembly into a bottom layer of a foundation bed of a roadbed, and filling gaps around the drainage assembly includes:
a bracket is arranged between the sleeve and the drain pipe to separate the sleeve and the drain pipe;
the method comprises the following steps of (1) plugging a gap between the end part of a sleeve and the bottom layer of a foundation bed to form a first plugging layer, plugging a gap between the end part of a drainage pipe and the end part of the sleeve to form a second plugging layer, and forming a grouting hole and an exhaust hole on the first plugging layer or the second plugging layer;
and injecting slurry from the grouting holes until the slurry completely fills the gaps at the periphery of the drainage assembly, and plugging the grouting holes and the exhaust holes.
In order to avoid that the inner wall of the sleeve 11 and the outer wall of the drain pipe 12 are attached together to affect the filling of the gap between the sleeve 11 and the drain pipe 12 when the gap between the sleeve 11 and the drain pipe 12 is filled later, a bracket 13 (see fig. 4) is arranged between the sleeve 11 and the drain pipe 12 to separate the sleeve 11 and the drain pipe 12.
The first blocking layer (not shown) blocks the gap between the end of the sleeve 11 and the bottom layer 210 of the foundation bed, so as to prevent the gap between the end of the sleeve 11 and the bottom layer 210 of the foundation bed from being communicated with the atmosphere, and the second blocking layer (not shown) blocks the gap between the end of the drain pipe 12 and the end of the sleeve 11, so as to prevent the gap between the end of the drain pipe 12 and the end of the sleeve 11 from being communicated with the atmosphere, so as to facilitate rapid grouting and filling of the gap around the drain assembly 10.
And (2) injecting slurry from the grouting hole 400 by using a high-pressure grouting pump, wherein a slurry leakage hole is formed in the side wall of the sleeve 11, the slurry enters a gap between the drain pipe 12 and the sleeve 11 and a gap between the sleeve 11 and the foundation bed bottom layer 210 along the slurry leakage hole, gas or liquid in the gap around the drainage assembly 10 is discharged from the exhaust hole 500, the slurry gradually fills the gap around the drainage assembly 10 from the slurry leakage hole until the slurry completely fills the gap around the drainage assembly 10, and grouting is stopped. The grouting holes 400 and the exhaust holes 500 can be formed in the first blocking layer or the second blocking layer, so that the purpose of quickly filling the peripheral gaps of the drainage assembly 10 is achieved, and the working efficiency is improved. Specifically, the grouting hole 400 is formed in the first blocking layer, slurry is injected from the grouting hole 400, the slurry gradually fills the gap between the sleeve pipe 11 and the foundation bed bottom layer 210, the slurry enters the gap between the drain pipe 12 and the sleeve pipe 11 through the slurry leakage hole, and the grouting hole 400 does not need to be formed in both the first blocking layer and the second blocking layer, so that the gap around the drainage assembly 10 can be completely filled. It is understood that a grouting hole 400 may be formed in the second blocking layer, and the principle is the same as that described above, and thus, the detailed description thereof is omitted.
The grouting holes 400 and the exhaust holes 500 are blocked, so that the grouting holes 400 and the exhaust holes 500 are prevented from being a circulation channel of underground water on one hand, and liquid from the outside is prevented from entering a roadbed through the grouting holes 400 and the exhaust holes 500 on the other hand.
It can be understood that if there is a situation that the grouting amount is not full in the gap around the drainage assembly 10, a plurality of grouting holes 400 and exhaust holes 500 may be provided, and the plurality of grouting holes 400 or the exhaust holes 500 may be provided on the first blocking layer, the second blocking layer, or both the first blocking layer and the second blocking layer.
In an embodiment, referring to fig. 3, in order to further facilitate grouting, a grouting hole 400 may be formed in the foundation bed surface layer 220 or the ballastless track 100, one end of the grouting hole 400 extends into a gap between the casing 11 and the foundation bed bottom layer 210, a high-pressure grouting pump is used for grouting from the other end of the grouting hole 400, the slurry gradually fills the gap between the casing 11 and the foundation bed bottom layer 210, and then the slurry gradually fills the gap between the casing 11 and the drain pipe 12 through the slurry leaking hole.
In one embodiment of the present application, referring to fig. 4, a bracket 13 is disposed between the sleeve 11 and the drainage pipe 12 at an interval. The spacing support 13 can better separate the sleeve 11 from the drain pipe 12, and is convenient for reducing the volume of the support 13 and being convenient for being arranged between the sleeve 11 and the drain pipe 12.
In one embodiment of the present application, the distance between two adjacent brackets 13 is 15cm to 30 cm. By adopting the design, the number of the brackets 13 can be reduced as much as possible under the condition of ensuring better separation of the sleeve 11 and the drain pipe 12, so that the cost is saved.
In order to further facilitate the construction of ballastless tracks with relatively narrow space, in an embodiment of the present application, please refer to fig. 3, the length of the casing 11 is 40cm to 60 cm. For example, 40cm, 45cm, 50cm, 55cm, 60 cm. It will be appreciated that a plurality of sleeves 11 may be used in combination to form a conduit having a length that meets the drainage distance requirements. Illustratively, a plurality of sleeves 11 may be connected back and forth to form a long drain line, and the connection between the plurality of sleeves 11 may be welded or screwed or connected by a joint. In a particular embodiment, two adjacent sleeves 11 are welded. The design is convenient for sealing the joint between the two sleeves 11 and preventing water from seeping out at the joint of the two sleeves 11. In another embodiment, two adjacent sleeves 11 are threaded. Not only the positioning connection between the two sleeves 11 is facilitated, but also the sealing performance between the two sleeves 11 is facilitated to be improved. In particular, it is possible that one end of the sleeve 11 has an external thread and the opposite end has a matching internal thread. It is also possible that the sleeve 11 comprises a first sleeve 11 and a second sleeve 11, the first sleeve 11 has internal threads at both ends, the second sleeve 11 has external threads at both ends adapted to the internal threads of the first sleeve 11, and the first sleeve 11 is screwed with the second sleeve 11. In yet another embodiment, two adjacent casings 11 are connected by a joint. This design facilitates further improvement of the sealing between the two sleeves 11. In particular, the joint may be a female or male joint or a band.
It should be noted that, when there are a plurality of casings 11, in a specific embodiment, the 1 st casing 11 may be detachably connected to the micro pipe jacking device, and the 1 st casing 11 is jacked into the borehole, further, the 1 st casing 11 may not be jacked into the borehole completely, but may be reserved outside the borehole for a certain length, for example, for a length of 5cm, and of course, may also be reserved for lengths of 4cm, 6cm, and the like. The part of the 1 st sleeve 11 reserved outside the drill hole is welded or screwed with one end of the 2 nd sleeve 11 or connected through a joint, the other end of the 2 nd sleeve 11 is detachably connected with the miniature pipe jacking equipment, the 2 nd sleeve 11 is jacked into the drill hole through the miniature pipe jacking equipment, similarly, the 2 nd sleeve 11 with a certain length can be reserved outside the drill hole or 5cm, and the part of the 2 nd sleeve 11 reserved outside the drill hole is used for being connected with the 3 rd sleeve 11. In this manner, depending on the depth of the borehole, a plurality of casings 11 may be sequentially jacked in the above-described manner.
In one embodiment of the present application, referring to fig. 3, the grouting holes 400 and the exhaust holes 500 are formed on the first sealing layer or the second sealing layer far from the working well 300. The grouting hole 400 is formed in the first plugging layer or the second plugging layer far away from the working well 300, a high-pressure grouting pump can conveniently conduct grouting through the grouting hole 400, the exhaust hole 500 is formed in the first plugging layer or the second plugging layer far away from the working well 300, when the exhaust hole 500 emits grout outwards, it is indicated that the gap at the periphery of the drainage structure 10 is filled with grout, and grouting conditions can be observed conveniently.
In an embodiment of the present application, please refer to fig. 2 and 3, the step of pouring concrete on a surface layer of a foundation bed of a roadbed of the water collecting well avoiding the inter-line region includes: and a ditch is reserved in the inter-line area and is communicated with two adjacent water collecting wells. That is to say, when the second sealing layer 30 is formed, a ditch template is placed, concrete is poured on the bed surface layer 220 of the inter-line area avoiding the water collecting well 20 to form the second sealing layer 30, after the second sealing layer 30 is constructed, the ditch template is removed, so that a ditch 40 is formed in the inter-line area, the ditch 40 is communicated with two adjacent water collecting wells 20, liquid in the inter-line area conveniently enters the water collecting well 20 through the ditch 40, and the liquid is discharged out of the ballastless track 100 through the drainage assembly 10. Specifically, the ditch template can adopt a pipeline with a set radius, and the pipeline can be fixed by adopting a buckling and pressing connecting piece.
In order to facilitate the liquid in the ditch 40 to enter the sump 20, in an embodiment of the present application, referring to fig. 3, the ditch 40 is a longitudinal slope of 0.1% to 0.5%.
In an embodiment of the present application, referring to fig. 5, the method for remedying includes:
s06, chiseling a third sealing layer and a second-stage gravel layer of a road shoulder of the ballastless track, and pouring concrete on the road shoulder to form a fourth sealing layer, wherein the height of the fourth sealing layer is lower than that of the supporting layer.
In the embodiment of the application, please refer to fig. 1, since the second-stage gravel distribution layer 3 'is disposed on the shoulder of the existing ballastless track 100', the third sealing layer 4 'is disposed above the second-stage gravel distribution layer', and the height of the third sealing layer 4 'is higher than that of the track slab 120'. Therefore, the third sealing layer 4 ' and the second-stage crushed stone layer 3 ' of the road shoulder of the existing ballastless track can be chiseled by the pneumatic pick matched with the electric pick or the air compressor, the thicker part of the third sealing layer 4 ' can be divided into blocks by the cutting machine and then chiseled, and the output line is transported by a flat car or a trolley. And concrete is poured on the road shoulder to form a fourth closed layer 50 (see fig. 3), and the height of the fourth closed layer 50 is lower than that of the supporting layer 110, so that liquid collected on the road shoulder of the ballastless track 100 can be conveniently discharged out of the ballastless track 100 from the upper surface of the fourth closed layer 50.
Specifically, the fourth closing layer 50 may be formed using fiber concrete casting.
It is understood that step S06 may be performed before any of the five steps S01, S02, S03, S04, S05, or after any of the five steps S01, S02, S03, S04, S05.
In order to further facilitate the liquid collected on the road shoulder of the ballastless track 100 to be discharged out of the ballastless track 100 from the upper surface of the fourth sealing layer 50, in an embodiment of the application, referring to fig. 3, the fourth sealing layer 50 is a 3% to 6% cross slope.
In order to facilitate the liquid on the second sealing layer 30 to rapidly enter the water collecting well 10 and/or the ditch 40, in one embodiment of the present application, referring to fig. 3, the end of the second sealing layer 30 close to the supporting layer 110 is higher than the end of the second sealing layer 30 close to the ditch 40. Further, the slope between the end of the second sealing layer 30 adjacent to the support layer 110 and the end of the second sealing layer 30 adjacent to the gutter 40 is 3% to 6%.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and all the changes or substitutions should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A method for renovating a waterproof and drainage structure of a ballastless track subgrade is characterized by comprising the following steps:
chiseling a first closed layer and a first-stage crushed stone layer in the area between the ballastless track lines;
excavating a working well in the inter-line area, transversely jacking a drainage assembly into the bottom layer of the foundation bed of the roadbed, and filling gaps at the periphery of the drainage assembly;
arranging a water collecting well in the working well, wherein the drainage assembly is communicated with the water collecting well so as to drain liquid in the water collecting well out of the ballastless track;
pouring concrete on the surface layer of the foundation bed of the roadbed avoiding the water collecting well in the inter-line area to form a second closed layer, wherein the height of the second closed layer is lower than that of the supporting layer of the ballastless track;
sealing the caulk between the second closure layer and the support layer.
2. The method of remediating of claim 1, wherein the drain assembly comprises a casing and a drain tube nested within the casing.
3. The method of claim 2, wherein the sidewall of the casing is perforated with grout holes.
4. The method of claim 3, wherein the step of excavating a working well in the interline area to laterally push a drainage module into the bedding bed of the subgrade to fill the gaps around the drainage module comprises:
arranging a bracket between the sleeve and the drain pipe to separate the sleeve and the drain pipe;
plugging a gap between the end part of the sleeve and the bottom layer of the foundation bed to form a first plugging layer, plugging a gap between the end part of the drain pipe and the end part of the sleeve to form a second plugging layer, and forming a grouting hole and an exhaust hole on the first plugging layer or the second plugging layer;
and injecting slurry from the grouting holes until the slurry completely fills the gaps at the periphery of the drainage assembly, and blocking the grouting holes and the exhaust holes.
5. The method of remediating of claim 4, wherein the bracket is spaced between the casing and the drain pipe;
and/or the length of the sleeve is 40 cm-60 cm;
and/or the grouting hole and the exhaust hole are arranged on the first plugging layer or the second plugging layer far away from the working well.
6. The renovation method according to any one of the claims 1 to 5, characterized in that the step of casting concrete on the surface layer of the foundation bed of the roadbed avoiding the water collecting well in the inter-line areas to form a second closed layer, wherein the height of the second closed layer is lower than that of the supporting layer of the ballastless track comprises the following steps: and reserving a ditch in the inter-line area, wherein the ditch is communicated with two adjacent water collecting wells.
7. The method of claim 6, wherein the raceway is in a longitudinal slope of 0.1% to 0.5%.
8. The method of any one of claims 1 to 5, wherein the method comprises:
chiseling a third sealing layer and a second-stage crushed stone layer of a road shoulder of the ballastless track;
and pouring concrete on the road shoulder to form the fourth closed layer, wherein the height of the fourth closed layer is lower than that of the supporting layer.
9. The method of claim 8, wherein the fourth confinement layer has a cross slope of 3% to 6%.
10. The method of claim 6, wherein an end of the second sealing layer adjacent the support layer is higher than an end of the second sealing layer adjacent the gutter.
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| CN201911002693.7A CN110670419A (en) | 2019-10-21 | 2019-10-21 | Method for renovating waterproof and drainage structure of ballastless track roadbed |
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| CN201911002693.7A CN110670419A (en) | 2019-10-21 | 2019-10-21 | Method for renovating waterproof and drainage structure of ballastless track roadbed |
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| CN117403482A (en) * | 2023-12-14 | 2024-01-16 | 北京城建信捷轨道交通工程咨询有限公司 | Ballastless track road surface waterproof structure and construction method |
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Address after: 430061 No. 745 Peace Avenue, Yangyuan, Wuchang, Wuhan, Hubei Province Applicant after: China Railway Siyuan Group Engineering Construction Co., Ltd Applicant after: CHINA RAILWAY SIYUAN SURVEY AND DESIGN GROUP Co.,Ltd. Address before: 430061 No. 745 Peace Avenue, Yangyuan, Wuchang, Wuhan, Hubei Province Applicant before: GEOTECHNICAL ENGINEERING CO., LTD. OF CHINA RAILWAY SIYUAN SURVEY AND DESIGN GROUP Co.,Ltd. Applicant before: CHINA RAILWAY SIYUAN SURVEY AND DESIGN GROUP Co.,Ltd. |