CN110172871A - Plateau Permafrost Regions High Speed Railway Subgrade and its construction method - Google Patents
Plateau Permafrost Regions High Speed Railway Subgrade and its construction method Download PDFInfo
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- CN110172871A CN110172871A CN201910502181.0A CN201910502181A CN110172871A CN 110172871 A CN110172871 A CN 110172871A CN 201910502181 A CN201910502181 A CN 201910502181A CN 110172871 A CN110172871 A CN 110172871A
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- 238000010276 construction Methods 0.000 title claims abstract description 32
- 230000002787 reinforcement Effects 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 17
- 239000002689 soil Substances 0.000 claims abstract description 15
- 239000004575 stone Substances 0.000 claims abstract description 12
- 230000010412 perfusion Effects 0.000 claims abstract description 4
- 238000005553 drilling Methods 0.000 claims description 16
- 230000003014 reinforcing effect Effects 0.000 claims description 11
- 238000003466 welding Methods 0.000 claims description 8
- 239000004568 cement Substances 0.000 claims description 7
- 230000036571 hydration Effects 0.000 claims description 6
- 238000006703 hydration reaction Methods 0.000 claims description 6
- 239000003351 stiffener Substances 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 4
- 108010053481 Antifreeze Proteins Proteins 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 241000209140 Triticum Species 0.000 claims description 3
- 235000021307 Triticum Nutrition 0.000 claims description 3
- 230000002528 anti-freeze Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 230000000873 masking effect Effects 0.000 claims description 3
- 230000003020 moisturizing effect Effects 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 239000002985 plastic film Substances 0.000 claims description 3
- 229920006255 plastic film Polymers 0.000 claims description 3
- 230000011218 segmentation Effects 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 244000025254 Cannabis sativa Species 0.000 claims description 2
- 230000015271 coagulation Effects 0.000 claims description 2
- 238000005345 coagulation Methods 0.000 claims description 2
- 210000003205 muscle Anatomy 0.000 claims description 2
- 238000005336 cracking Methods 0.000 abstract description 2
- 238000013459 approach Methods 0.000 abstract 1
- 230000004224 protection Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000013019 agitation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000007560 sedimentation technique Methods 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- E01B1/001—Track with ballast
-
- 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
- E01B2/003—Arrangement of tracks on bridges or in tunnels
-
- 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
- E01B2/006—Deep foundation of tracks
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D1/00—Bridges in general
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/06—Arrangement, construction or bridging of expansion joints
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/08—Damp-proof or other insulating layers; Drainage arrangements or devices ; Bridge deck surfacings
- E01D19/086—Drainage arrangements or devices
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/10—Railings; Protectors against smoke or gases, e.g. of locomotives; Maintenance travellers; Fastening of pipes or cables to bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/10—Railings; Protectors against smoke or gases, e.g. of locomotives; Maintenance travellers; Fastening of pipes or cables to bridges
- E01D19/103—Parapets, railings ; Guard barriers or road-bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/35—Foundations formed in frozen ground, e.g. in permafrost soil
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The present invention relates to Plateau Permafrost Regions High Speed Railway Subgrade and its construction methods, the road structure bottom is stake, and stake top is the groove-shaped supporting board of armored concrete, and groove-shaped supporting board includes the floor of bottom plate and two sides, it is equipped with graded broken stone on bottom plate, track structure is set on graded broken stone；Stake is mechanical hole perfusion post, and elongated arrangement of reinforcement, stake bottom gos deep into ever-frozen ground, bar dowel is added near frozen soil natural permafrost table.The present invention applies Permafrost Area pile foundation computational theory, it fully considers and freezes and melt two states, the pile foundation support board structure of design had both solved the technical problems such as Permafrost Area subgrade settlement, frost heave, cracking, inhomogeneous deformation, roadbed earthwork exploitation, railway land occupation can be reduced again, facilitate wild animal normal pass, provides technological approaches and method for Permafrost Area high speed railway construction.
Description
Technical field
The present invention relates to a kind of roadbeds, and in particular to a kind of Plateau Permafrost Regions High Speed Railway Subgrade and its construction
Method.
Background technique
High-speed railway subgrade is subject to the basis of track structure and train load, is the important component of railway engineering,
It is the key project for guaranteeing train high speed, safety, comfortable operating system.Subgrade engineering should also have in addition to should have basic function
There are enough intensity, rigidity, stability and durability, guarantee that roadbed is smooth, guarantees railway basis safety steady in a long-term.High-speed iron
Road post-construction settlement of subgrade control standard is shown in Table 1.
The soil body is to generate thaw collapse, frost heave and bad jelly containing the basic place that ice is that ever-frozen ground is different from other class ground
The basic place of native phenomenon.Often there is Thick Underground Ice and hight-ice-content permafrost near ever-frozen ground natural permafrost table, due to
It is buried shallowly, and the influence of the natural factors such as climate, ecology, microrelief, hydrologic condition and various human activities is easy to melt,
The permafrost protections technologies such as existing slabstone air cooling, ventilation duct, heat pipe are difficult to ensure that thaw collapse, frost-heaving deformation do not occur for ever-frozen ground,
It is unable to satisfy the requirement of high-speed railway sedimentation techniques standard.
Summary of the invention
The object of the present invention is to provide a kind of Plateau Permafrost Regions High Speed Railway Subgrade and its construction methods, meet
Plateau Permafrost Regions use demand.
The technical scheme adopted by the invention is as follows:
Plateau Permafrost Regions High Speed Railway Subgrade, it is characterised in that:
The road structure bottom is stake, and stake top is the groove-shaped supporting board of armored concrete, and groove-shaped supporting board includes bottom plate and two sides
Floor is equipped with graded broken stone on bottom plate, track structure is arranged on graded broken stone；
Stake is mechanical hole perfusion post, and elongated arrangement of reinforcement, stake bottom gos deep into ever-frozen ground, bar dowel is added near frozen soil natural permafrost table.
On the bottom plate of groove-shaped supporting board, graded broken stone two sides be arranged facilities network column.
On the bottom plate of groove-shaped supporting board, cable trough is set on the outside of facilities network column.
Upright railing is provided on the floor of groove-shaped supporting board two sides.
Outside drain hole is provided on the floor of groove-shaped supporting board.
Stake is directly rigidly connected with groove-shaped supporting board, stake top insert plate bottom.
Groove-shaped supporting board end is taken and is put on the bracket of abutment end face setting by the road structure and bridge joint.
The expansion joint of 3cm, filled and process rubber slab in expansion joint are reserved between groove-shaped supporting board end and abutment tail.
The construction method of Plateau Permafrost Regions High Speed Railway Subgrade, it is characterised in that:
The following steps are included:
Step 1: pile driving construction:
(1) drilling construction of every pile is carried out continuously, and promotes drill bit when shutting down for some reason, has the drilling machine of drilling rod, by drill bit lift-off hole
Bottom 5m or more, other drilling machines propose drill bit outside hole；
(2) after pore-forming reaches design altitude, hole quality and the heavy quarrel situation of bottom hole are checked；It is timely entered after passed examination
Next process；Stake bottom is reported when existing containing native ice sheet by construction program in time；
(3) it is carried out continuously when casting concrete；Safeguard measure is taken in aperture, prevents aperture loosened soil from falling into hole；
(4) molding temperature is not higher than 10 DEG C when concreting；
(5) after pile foundation construction, the processing of pile foundation anti-freeze expansion is carried out by design requirement, and be monitored to stake week ground temperature；
(6) after pile driving construction is completed 28 days, pile quality detection is carried out to whole foundation piles using low strain reflected wave method, and according to setting
Meter requires to carry out foundation pile loading test, to examine its bearing capacity；
Step 2: groove-shaped supporting board construction:
(1) plate is poured using the lower concrete segmentation of the heat of hydration, and pre-buried railing bolt when pouring reserves drain hole；
(2) to reduce concrete shrinkage, the match ratio of concrete, early stage small using heat of hydration low-shrinkage as far as possible are reasonably adjusted
High-strength cement reduces cement consumption, reduces the ratio of mud, and reinforces wet curing work；
(3) in concreting, chance rain and snow weather must not be soaked before masking measure, concrete should be taken to be not up to final set；
(4) longitudinally reinforced reinforcing bar is arranged in the construction joint position of continuous slab, and stiffener quantity is the 50% of longitudinal reinforcement, and reinforcing bar is straight
The same longitudinal reinforcement of diameter, stiffener are inserted into two sides concrete depth and are not less than 1m；
(5) longitudinal reinforcement uses flash-butt welding in plate, and strength of welded joint is not less than the tensile strength of reinforcing bar itself；Welding connects
Head is located to meet with stresses and smaller part and mutually stagger, and the welding point of longitudinal reinforcement is not more than the 50% of longitudinal reinforcement quantity；It is same
Root reinforcing bar sets connector less；
(6) it after plate construction, is covered in time, moisturizing, insulated curing 1~2 month；When using covering and heat insulating, template is outer and coagulation
The insulating layer of native surface covering, newly-laid concrete surface spreads layer of plastic film；
(7) it after curing period, to avoid the exposure of its long-time, is influenced by temperature change, plate face covering is not less than the wheat of 5cm thickness
Grass is protected.
The invention has the following advantages that
1, pile foundation support board structure applies Permafrost Area pile foundation computational theory, fully considers and freezes and melt two states, solves
The technical problems such as permafrost area embankment of having determined sedimentation, frost heave, cracking and inhomogeneous deformation, it is ensured that high-speed railway high speed, peace
Entirely, it comfortably runs.
2, pile foundation construction uses churning driven dry method hole creating technology, and speed of fulfiling hole is fast, hole wall rule, the thermal agitation to frozen soil
It is small, frozen soil environment is disturbed less, the construction quality of drilled pile bored concrete pile can be increased substantially；Due to there is no mud, also subtract significantly
Few pollution to environment, favorable environment protection.
3, the conventional thought that roadbed is continuous band-shaped entity structure object is breached, roadbed earthwork exploitation is greatly lowered, subtracts
Few railway land occupation takes soil site, is conducive to protection of permafrost area vegetation, environmental protection.
4, space is conducive to wild animal normal pass, migrates, multiplies and lives between stake, is conducive to ecological environmental protection.
Detailed description of the invention
Fig. 1 is cross-sectional view of the present invention；
Fig. 2 is front elevation of the present invention.
In figure, 1- facilities network column, 2- railing, 3- cable trough, 4- drain hole, 5- graded broken stone, 6- groove-shaped supporting board, 7-
Stake, 8- bracket, 9- abutment.
Specific embodiment
The present invention will be described in detail With reference to embodiment.
The present invention relates to a kind of Plateau Permafrost Regions High Speed Railway Subgrade, the road structure bottom is stake 7, stake
Top is the groove-shaped supporting board 6 of armored concrete, and groove-shaped supporting board 6 includes the floor of bottom plate and two sides, is equipped with graded broken stone 5 on bottom plate
Track structure is arranged on graded broken stone 5 in (mixing 5% cement)；Stake 7 is mechanical hole perfusion post, and elongated arrangement of reinforcement, the ratio of reinforcement is no less than
0.6%, stake diameter 1m, 4.6~5m of lateral stake spacing, 5~7m of longitudinal stake spacing, pore-forming use rotary drilling rig dry method pore-forming technique, stake
Basis considers to freeze and melt two states, and there are certain degrees of safety.Foundation soil within the scope of 1.5 times of natural permafrost table depth
Disregard freezing force or frictional force, disregards freezing force containing native ice sheet.Stake bottom must not be placed in containing on native ice sheet.Stake bottom is deeply frozen for many years
Soil adds bar dowel, separately according to engineering geological condition when frozen soil natural permafrost table is nearby hight-ice-content permafrost to resist soil
The lifting by frost power that frost heave generates.Stake 7 is directly rigidly connected with groove-shaped supporting board 6, stake top insert plate bottom 0.1m.
6 thickness 1.0m of groove-shaped supporting board, width is according to classification of track, main track number, line spacing, Widening on Curve, shoulder width, electricity
The factors such as cable slot, contact net pillar types and type of foundation, which calculate, to be determined.
On the bottom plate of groove-shaped supporting board 6,5 two sides of graded broken stone be arranged facilities network column 1.On the bottom plate of groove-shaped supporting board 6, basis
Cable trough 3 is set on the outside of net column 1.Upright railing 2 is provided on the floor of 6 two sides of groove-shaped supporting board.The floor of groove-shaped supporting board 6
On be provided with outside drain hole 4.
6 end of groove-shaped supporting board is taken and is put on the bracket 8 of 9 end face of abutment setting by the road structure and bridge joint.Slot
The expansion joint of 3cm, filled and process rubber slab in expansion joint are reserved between 9 tail of 6 end of type supporting plate and abutment.
Work progress of the invention are as follows:
1, it rather fills out when arranging drilling construction place and does not dig as far as possible, reduce the thermal agitation to original place table foundation soil.
2, pore-forming uses " dry method " pore-forming technique, should not take band drilling mud practice.Steel pile casting it is embedding using pressurization, hammering or
Vibratory drilling method, casing bottom should be placed in Upper Limit of Permafrost or less not less than 0.5 m.
3, drilled pile construction
(1) drilling construction of every pile should be carried out continuously, and drill bit should be promoted for some reason by shutting down, and had the drilling machine of drilling rod, should be mentioned drill bit
From bottom hole 5m or more, other drilling machines should propose drill bit outside hole.
(2) after pore-forming reaches design altitude, situations such as being cut that should sink to hole quality and bottom hole is checked；After passed examination
Next process should be timely entered, the intermittent time is unsuitable too long.Stake bottom should be reported in time when existing containing native ice sheet by construction program.
(3) it should be carried out continuously when casting concrete；Aperture should take safeguard measure, prevent aperture loosened soil from falling into hole.
(4) molding temperature should not be higher than 10 DEG C when concreting.
(5) after pile foundation construction, the processing of pile foundation anti-freeze expansion is carried out by design requirement, and should supervise to stake week ground temperature
It surveys.
(6) after pile driving construction is completed 28 days, pile quality detection, and root are carried out to whole foundation piles using low strain reflected wave method
Foundation pile loading test is carried out according to design requirement, to examine its bearing capacity.
4, groove-shaped supporting board is constructed
(1) plate is poured using the lower concrete segmentation of the heat of hydration.Pre-buried railing bolt when pouring reserves drain hole.
(2) to reduce concrete shrinkage, the match ratio of concrete should be reasonably adjusted, uses heat of hydration low-shrinkage small as far as possible
Early stage high-strength cement, reduce cement consumption, reduce the ratio of mud, and reinforce wet curing work.
(3) in concreting, chance rain and snow weather must not be soaked before masking measure, concrete should be taken to be not up to final set.
(4) longitudinally reinforced reinforcing bar is arranged in the construction joint position of continuous slab, and stiffener quantity is the 50% of longitudinal reinforcement, steel
The same longitudinal reinforcement of muscle diameter, stiffener are inserted into two sides concrete depth and are not less than 1m.
(5) longitudinal reinforcement uses flash-butt welding in plate, and strength of welded joint is not less than the tensile strength of reinforcing bar itself；Weldering
Connector should be located to meet with stresses and smaller part and mutually stagger, and the welding point of longitudinal reinforcement should not exceed longitudinal reinforcement quantity
50%；Same root reinforcing bar Ying Shaoshe connector.
(6) it after plate construction, should be covered in time, moisturizing, insulated curing 1~2 month.When using covering and heat insulating, outside template
With the insulating layer of concrete surface covering, the material of dampness should not be used, it also should not be by the direct bedding of thermal insulation material in tide
Wet concrete surface, newly-laid concrete surface should spread layer of plastic film.
(7) it after curing period, to avoid the exposure of its long-time, is influenced by temperature change, plate face covering is thick not less than 5cm
Wheat straw protected.
The contents of the present invention are not limited to cited by embodiment, and those of ordinary skill in the art are by reading description of the invention
And to any equivalent transformation that technical solution of the present invention is taken, all are covered by the claims of the invention.
Claims (9)
1. Plateau Permafrost Regions High Speed Railway Subgrade, it is characterised in that:
The road structure bottom is stake (7), and stake top is the groove-shaped supporting board (6) of armored concrete, and groove-shaped supporting board (6) includes bottom plate
With the floor of two sides, it is equipped with graded broken stone (5) on bottom plate, track structure is arranged on (5) in graded broken stone；
Stake (7) is mechanical hole perfusion post, and elongated arrangement of reinforcement, stake bottom gos deep into ever-frozen ground, short steel is added near frozen soil natural permafrost table
Muscle.
2. Plateau Permafrost Regions High Speed Railway Subgrade according to claim 1, it is characterised in that:
On the bottom plate of groove-shaped supporting board (6), graded broken stone (5) two sides setting facilities network column (1).
3. Plateau Permafrost Regions High Speed Railway Subgrade according to claim 2, it is characterised in that:
Cable trough (3) are set on the bottom plate of groove-shaped supporting board (6), on the outside of facilities network column (1).
4. Plateau Permafrost Regions High Speed Railway Subgrade according to claim 3, it is characterised in that:
Upright railing (2) are provided on the floor of groove-shaped supporting board (6) two sides.
5. Plateau Permafrost Regions High Speed Railway Subgrade according to claim 4, it is characterised in that:
Outside drain hole (4) are provided on the floor of groove-shaped supporting board (6).
6. Plateau Permafrost Regions High Speed Railway Subgrade according to claim 5, it is characterised in that:
Stake (7) and groove-shaped supporting board (6) are directly rigidly connected, stake top insert plate bottom.
7. Plateau Permafrost Regions High Speed Railway Subgrade according to claim 6, it is characterised in that:
Groove-shaped supporting board (6) end is taken and is put on the bracket (8) of abutment (9) end face setting by the road structure and bridge joint.
8. Plateau Permafrost Regions High Speed Railway Subgrade according to claim 7, it is characterised in that:
The expansion joint of 3cm, filled and process rubber slab in expansion joint are reserved between groove-shaped supporting board (6) end and abutment (9) tail.
9. the construction method of Plateau Permafrost Regions High Speed Railway Subgrade, it is characterised in that:
The following steps are included:
Step 1: pile driving construction:
(1) drilling construction of every pile is carried out continuously, and promotes drill bit when shutting down for some reason, has the drilling machine of drilling rod, by drill bit lift-off hole
Bottom 5m or more, other drilling machines propose drill bit outside hole；
(2) after pore-forming reaches design altitude, hole quality and the heavy quarrel situation of bottom hole are checked；It is timely entered after passed examination
Next process；Stake bottom is reported when existing containing native ice sheet by construction program in time；
(3) it is carried out continuously when casting concrete；Safeguard measure is taken in aperture, prevents aperture loosened soil from falling into hole；
(4) molding temperature is not higher than 10 DEG C when concreting；
(5) after pile foundation construction, the processing of pile foundation anti-freeze expansion is carried out by design requirement, and be monitored to stake week ground temperature；
(6) after pile driving construction is completed 28 days, pile quality detection is carried out to whole foundation piles using low strain reflected wave method, and according to setting
Meter requires to carry out foundation pile loading test, to examine its bearing capacity；
Step 2: groove-shaped supporting board construction:
(1) plate is poured using the lower concrete segmentation of the heat of hydration, and pre-buried railing bolt when pouring reserves drain hole；
(2) to reduce concrete shrinkage, the match ratio of concrete, early stage small using heat of hydration low-shrinkage as far as possible are reasonably adjusted
High-strength cement reduces cement consumption, reduces the ratio of mud, and reinforces wet curing work；
(3) in concreting, chance rain and snow weather must not be soaked before masking measure, concrete should be taken to be not up to final set；
(4) longitudinally reinforced reinforcing bar is arranged in the construction joint position of continuous slab, and stiffener quantity is the 50% of longitudinal reinforcement, and reinforcing bar is straight
The same longitudinal reinforcement of diameter, stiffener are inserted into two sides concrete depth and are not less than 1m；
(5) longitudinal reinforcement uses flash-butt welding in plate, and strength of welded joint is not less than the tensile strength of reinforcing bar itself；Welding connects
Head is located to meet with stresses and smaller part and mutually stagger, and the welding point of longitudinal reinforcement is not more than the 50% of longitudinal reinforcement quantity；It is same
Root reinforcing bar sets connector less；
(6) it after plate construction, is covered in time, moisturizing, insulated curing 1~2 month；When using covering and heat insulating, template is outer and coagulation
The insulating layer of native surface covering, newly-laid concrete surface spreads layer of plastic film；
(7) it after curing period, to avoid the exposure of its long-time, is influenced by temperature change, plate face covering is not less than the wheat of 5cm thickness
Grass is protected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910502181.0A CN110172871A (en) | 2019-06-11 | 2019-06-11 | Plateau Permafrost Regions High Speed Railway Subgrade and its construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910502181.0A CN110172871A (en) | 2019-06-11 | 2019-06-11 | Plateau Permafrost Regions High Speed Railway Subgrade and its construction method |
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| CN110172871A true CN110172871A (en) | 2019-08-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110820731A (en) * | 2019-12-05 | 2020-02-21 | 东莞嘉誉诚建设基础工程有限公司 | Construction process of cast-in-situ bored pile |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4407747A1 (en) * | 1994-03-08 | 1995-11-09 | Porr Technobau Ag | Train rail track securing system |
| RU2052007C1 (en) * | 1988-02-29 | 1996-01-10 | Петр Степанович Лобов | Railway track and method for its construction |
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