CN109371763A - A kind of phreatic high is low to fill out shallow cut subgrade in swelling soil zone construction method - Google Patents

A kind of phreatic high is low to fill out shallow cut subgrade in swelling soil zone construction method Download PDF

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Publication number
CN109371763A
CN109371763A CN201811376694.3A CN201811376694A CN109371763A CN 109371763 A CN109371763 A CN 109371763A CN 201811376694 A CN201811376694 A CN 201811376694A CN 109371763 A CN109371763 A CN 109371763A
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subgrade
loading plate
plate
reinforced concrete
low
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CN201811376694.3A
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CN109371763B (en
Inventor
陈远洪
曾长贤
刘国
骆斌
王双权
马克丰
陈俊
叶龙振
高杰
吴红岩
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China Railway Siyuan Survey and Design Group Co Ltd
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China Railway Siyuan Survey and Design Group Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01BPERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B2/00General structure of permanent way

Abstract

The present invention relates to track bed technical field of structures, fill out shallow cut subgrade in swelling soil zone construction method in particular to a kind of phreatic high is low.Foundation soil is excavated to subgrade bed bottom surface;In subgrade bed bottom surface construction reinforced bar concrete-pile;Pouring reinforcement concrete raft plate;Pour loading plate;In Reinforced Concrete Raft plate and loading plate two sides backfill infiltration soil;Start to fill bedding packing layer in the upper surface of loading plate;The underground water of the construction drainage ditch on the side ground of the separate roadbed of infiltration soil, communicated drainage ditch and infiltration soil, discharge Reinforced Concrete Raft plate lower section and two sides makes the filler on loading plate be in drying regime.Road structure of the invention is sufficiently integrated using stake and raft plate overall structure, filler displacement and draining limit for height, successfully solves that swelled ground is acted on expansion arch risk by full water and bedding is risen soil disease.

Description

A kind of phreatic high is low to fill out shallow cut subgrade in swelling soil zone construction method
Technical field
The present invention relates to track bed technical field of structures, fill out shallow cut expansion dirt road in particular to a kind of phreatic high is low Base construction method.
Background technique
Under phreatic high high-speed railway it is low fill out shallow cut subgrade in swelling soil zone generally using bedding range is changed fill out infiltration soil, ground Base is handled using Net Pile Composite Ground.The treatment measures are able to satisfy subgrade settlement control and require, but are millimeter for deformation requirements The high-speed railway of grade, there are still some problems: the high-speed railway of current some operations is because swelled ground water swelling has occurred in succession Some arch diseases, Net Pile Composite Ground do not fully consider anti-upper arch action, and swelled ground is acted on more by full water under phreatic high Easily expand deformation, change fill out processing after banket weight cannot resist arch load when roadbed easily arch up, it is serious to also cause rail Road structure squeeze crack is destroyed, and traffic safety is threatened;Bedding is impregnated by water under phreatic high simultaneously, is back and forth made in train high speed dynamic load It easily rises soil under industry disease, causes to squeeze outside roadbed and track settlement, influence the stationarity of high-speed rail train.
Having Patent No. " CN106049196A " entitled, " flexible pile and stake raft combine ballastless track roadbed construction with section The Chinese invention patent of method ", the patent describe a kind of roadbed construction method with stake raft structure, the stakes of this method construction Raft structure can carry out part isolation to the underground water below roadbed, avoid impregnating expansion soil expansion because of the underground water below stake raft After be applied directly on roadbed.But the structure only actually considers the groundwater effect immediately below roadbed, due to underground water Mobility, the underground water of roadbed two sides can equally have an adverse effect to roadbed, easily rise soil disease, and the patent Keeping the structure of construction practical is exactly to intercept underground water below stake raft, but such closure is actually unfavorable for entire roadbed Safety, stake raft is immersed in underground water, affords soil swelling active force, water buoyancy and roadbed pressure, active force is more Complexity need to increase closeer longer stake and increase project cost, it is easy to cause entire subgrade defect.
Summary of the invention
Present invention aim to the existing stake raft structures for solving to mention in above-mentioned background technique to be applied to high underground water The problem of be easy to causeing subgrade defect when the area of position, provide that a kind of phreatic high is low to fill out shallow cut subgrade in swelling soil zone construction method.
The technical solution of the present invention is as follows: a kind of phreatic high is low to fill out shallow cut subgrade in swelling soil zone construction method, feature exists In: the following steps are included:
1, foundation soil is excavated to subgrade bed bottom surface, is excavated temporary drainage structure and is excluded seepage in foundation seepage;
2, it drills in subgrade bed bottom surface, transfers steel reinforcement cage, pour perfusion reinforced concrete pile;
3, levelling excavation ground basal plane, binds raft plate steel mesh, pouring reinforcement concrete raft plate and by itself and armored concrete Stake is connected as one;
4, it is located in track load coverage in Reinforced Concrete Raft plate upper surface and pours loading plate;
5, it is located at backfill infiltration soil outside track load coverage in Reinforced Concrete Raft plate and loading plate two sides;
6, start to fill bottom layer of subgrade packing layer in the upper surface of loading plate and surface layer of subgrade bed packing layer forms track bed;
7, construction drainage ditch, communicated drainage ditch and infiltration soil on side ground of the infiltration soil far from roadbed, discharge reinforcing bar Below concrete raft plate and the underground water of two sides makes the filler on loading plate be in drying regime.
In the further step 3, the method for connection Reinforced Concrete Raft plate and reinforced concrete pile are as follows: binding raft Reinforced concrete pile upper end steel reinforcement cage is connect by plate steel mesh with raft plate steel mesh, and then casting concrete is by armored concrete Stake top portion and upper end bar and raft plate steel mesh are poured in one.
In the step 4, the method that pours loading plate are as follows: poured in the upper surface of Reinforced Concrete Raft plate The concrete of no-reinforcing-bar skeleton forms loading plate, and loading plate upper surface is made to be higher by underground water peak level not less than 0.2m.
The further loading plate is in casting process, and height, two sides are low among the upper surface of loading plate pours out The flowing water slope at least 2% gradient.
In the further step 4, the method for backfill infiltration soil are as follows: in Reinforced Concrete Raft plate and loading plate two sides Backfill infiltration soil flushes the upper surface of the infiltration soil of backfill with loading plate upper surface lowest point.
In the step 6, the method for filling bottom layer of subgrade packing layer are as follows: filled in the upper surface of loading plate Bottom layer of subgrade packing layer makes the upper surface of bottom layer of subgrade packing layer form the intermediate gradient at least 4% high, two sides are low.
The method for further filling surface layer of subgrade bed packing layer are as follows: fill surface layer of subgrade bed according to surface layer of subgrade bed compacting criteria and fill out Material, road bed shape are arranged according to high speed railway track pattern.In the further step 7, communicated drainage ditch and infiltration The method of soil are as follows: excavate multiple drain holes, drain hole edge along roadbed longitudinal gap on side side wall of the gutter cover to roadbed Roadbed extends laterally into infiltration soil, and height is not higher than the upper surface of loading plate.
Further multiple sluicing are excavated along 1~2m of roadbed longitudinal gap on the side side wall in gutter cover to roadbed Hole.
Further drain hole is excavated to position of the side wall apart from bottom of trench 0.3m or more of roadbed side in gutter cover.
Further the loading plate with a thickness of 0.3~1.0m is poured in Reinforced Concrete Raft plate upper surface.
Advantages of the present invention has: 1, road structure of the invention is sufficiently integrated is filled out using stake and raft plate overall structure, setting Material displacement and draining limit for height structure, successfully solve that swelled ground is acted on expansion arch risk by full water and bedding is risen soil disease Evil;
2, road structure of the invention avoids pest and disease risk, has ensured the smooth even running of high-speed railway, society's effect Benefit and economic benefit are obvious, while being compared to and carrying out aerial processing more saving expense using the stake of type of bridge and slab and girder With and reduce difficulty of construction;
3, road structure of the invention tolerance rainy season test, road structure are stablized, and have good use state.
Detailed description of the invention
Fig. 1: road structure schematic diagram of the invention;
Wherein: 1-reinforced concrete pile;2-Reinforced Concrete Raft plates;3-loading plates;4-bottom layer of subgrade packing layers; 5-surface layer of subgrade bed packing layers;6-gutters;7-infiltration soil;8-drain holes.
Specific embodiment
The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
For the Plain of Huanghua Area and the high Terrance Area of Nanyang Basin that the high railway line of Zheng ten thousand is walked, soil is expanded for phreatic high Based structures arch up in order to avoid roadbed is acted on by swelled ground water swelling power, and the present embodiment has poured below roadbed filling layer Stake raft structure.
As shown in Figure 1, the stake raft structure of the present embodiment includes the more reinforcing bars being vertically supported in below roadbed filling layer Concrete-pile 1 and the Reinforced Concrete Raft plate 2 for being fixed on 1 upper end of reinforced concrete pile.Reinforced concrete pile 1 is drill-pouring Stake, stake diameter are 0.6~1.0m.Reinforced Concrete Raft plate 2 is located at the underface of roadbed filling layer, is the plate knot of surfacing Structure, with a thickness of 0.5~0.8m.Reinforced Concrete Raft plate 2 can come roadbed filling layer and the isolation of lower section underground water, avoid Lower section soil body arch power is applied on packing layer.
The present embodiment has poured loading plate 3 in 2 upper surface of Reinforced Concrete Raft plate, and the carrying as road structure is basic, Loading plate 3 is the plain concrete plate structure of no-reinforcing-bar skeleton, and construction and building cost can be effectively reduced.Loading plate 3 it is upper End face is the low slope structure at least 2% gradient in intermediate high two sides.Loading plate 3 is that upper surface is higher by underground water highest water Position is not less than 0.2m, and plate thickness is 0.3~1.0m.
As shown in Figure 1, roadbed filling layer include fill 3 upper surface of loading plate bottom layer of subgrade packing layer 4 and fill in Surface layer of subgrade bed packing layer 5 on bottom layer of subgrade packing layer 4, the lower end surface height of bottom layer of subgrade packing layer 3 is not less than infiltration soil 7 Upper surface.The upper surface of bottom layer of subgrade packing layer 4 is the low slope structure at least 4% gradient in intermediate high two sides.
In order to discharge the underground water of 2 lower section of Reinforced Concrete Raft plate and two sides, guarantee that roadbed filling layer is in drying always State reduces subgrade defect with this.The present embodiment is provided with discharge structure in 2 two sides of Reinforced Concrete Raft plate.As shown in Figure 1, It is included in the gutter 6 of roadbed two sides excavation and backfills the infiltration soil 7 between gutter 6 and Reinforced Concrete Raft plate 2.This 7 loose soil structures with hole of infiltration soil of embodiment, can be by smoothly hole water flowing by armored concrete The underground water discharge of 2 lower section of raft plate and two sides is into gutter 6.Upper surface of the upper surface of infiltration soil 7 without departing from loading plate 3.
Gutter 6 is towards the drain hole 8 for offering multiple connection infiltration soil 7 on the side side wall of roadbed, adjacent drain hole 8 Along roadbed 1~2m of longitudinal gap, 8 one end communicated drainage ditch 6 of drain hole, the other end extends to infiltration soil 7 along roadbed transverse direction Interior, 8 lower end of drain hole is lower than the upper surface of loading plate 3 apart from gutter 6 bottom of trench at least 0.3m, upper end.
Practice of construction the following steps are included: 1, excavate foundation soil to subgrade bed bottom surface, excavate one respectively with roadbed two sides The temporary drain that width is 0.2m, depth is 0.3m excludes seepage in foundation seepage;
2, it drills in subgrade bed bottom surface, transfers steel reinforcement cage, pour perfusion reinforced concrete pile 1;
3, levelling excavation ground basal plane, binds raft plate steel mesh, by 1 upper end steel reinforcement cage of reinforced concrete pile and raft plate steel mesh Binding and fixing connection, then casting concrete is by raft plate steel mesh and the 0.1~0.2m of top of reinforced concrete pile 1 and upper end bar It pours in one, forms Reinforced Concrete Raft plate 2;
4, it is located in track load coverage in 1 upper surface of Reinforced Concrete Raft plate and pours loading plate 3;
5, it is located at backfill infiltration soil 7 outside track load coverage in Reinforced Concrete Raft plate 2 and 3 two sides of loading plate, The upper surface for being backfilled to infiltration soil 7 is flushed with the upper surface of loading plate 3;
6, start to fill bottom layer of subgrade packing layer 4 in the upper surface of loading plate 3 and surface layer of subgrade bed packing layer 5 forms track road Base fills bottom layer of subgrade packing layer 4 according to bottom layer of subgrade compacting criteria, fills surface layer of subgrade bed according to surface layer of subgrade bed compacting criteria and fill out The bed of material 5, road bed shape are arranged according to high speed railway track pattern;
7, it takes patterning method to excavate two sides lateral sulcus foundation pit on the native 7 side grounds far from roadbed of infiltration, binds lateral sulcus steel Muscle pours lateral sulcus concrete and forms gutter 6, communicated drainage ditch 6 and infiltration soil 7, discharge Reinforced Concrete Raft plate 2 lower section and The underground water of two sides makes the filler on loading plate 3 be in drying regime.
As shown in Figure 1, the roadbed of the present embodiment longitudinally refers to the direction of vertical paper in Fig. 1, roadbed laterally refers to upper in Fig. 1 Lower direction, vertical direction refer to the left and right directions in Fig. 1.
The basic principles, main features and advantages of the present invention have been shown and described above.The technology of the industry Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this The principle of invention, various changes and improvements may be made to the invention without departing from the spirit and scope of the present invention, these changes Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its Equivalent defines.

Claims (10)

1. a kind of phreatic high is low to fill out shallow cut subgrade in swelling soil zone construction method, it is characterised in that: the following steps are included:
1) foundation soil, is excavated to subgrade bed bottom surface, is excavated temporary drainage structure and is excluded seepage in foundation seepage;
2) it, drills in subgrade bed bottom surface, transfers steel reinforcement cage, pour perfusion reinforced concrete pile (1);
3), levelling excavation ground basal plane, binds raft plate steel mesh, pouring reinforcement concrete raft plate (2) and by itself and armored concrete Stake (1) is connected as one;
4), it is located in track load coverage in Reinforced Concrete Raft plate (1) upper surface and pours loading plate (3);
5), it is located at outside track load coverage in Reinforced Concrete Raft plate (2) and loading plate (3) two sides and backfills infiltration soil (7);
6), start to fill bottom layer of subgrade packing layer (4) in the upper surface of loading plate (3) and surface layer of subgrade bed packing layer (5) forms rail Road Base;
7), in the construction drainage ditch (6) on the side ground of native (7) far from roadbed that seeps water, communicated drainage ditch (6) and infiltration are native (7), Below discharge Reinforced Concrete Raft plate (2) and the underground water of two sides makes the filler on loading plate (3) be in drying regime.
2. a kind of phreatic high is low as described in claim 1 fills out shallow cut subgrade in swelling soil zone construction method, it is characterised in that: institute In the step 3) stated, the method for connection Reinforced Concrete Raft plate (2) and reinforced concrete pile (1) are as follows: binding raft plate steel mesh, it will At the top of reinforced concrete pile (1) and upper end steel reinforcement cage is connect with raft plate steel mesh, and then casting concrete is by reinforced concrete pile (1) end bar and raft plate steel mesh are poured in one on.
3. a kind of phreatic high is low as described in claim 1 fills out shallow cut subgrade in swelling soil zone construction method, it is characterised in that: institute In the step 4) stated, the method that pours loading plate (3) are as follows: pour no-reinforcing-bar skeleton in the upper surface of Reinforced Concrete Raft plate (2) Concrete form loading plate (3), so that loading plate (3) upper surface is higher by underground water peak level not less than 0.2m.
4. a kind of phreatic high is low as claimed in claim 3 fills out shallow cut subgrade in swelling soil zone construction method, it is characterised in that: institute For the loading plate (3) stated in casting process, what height, two sides were low among the upper surface of loading plate (3) pours out has at least 2% The flowing water slope of the gradient.
5. a kind of phreatic high is low as described in claim 1 fills out shallow cut subgrade in swelling soil zone construction method, it is characterised in that: institute In the step 4) stated, the method for backfill infiltration native (7) are as follows: in Reinforced Concrete Raft plate (2) and the backfill infiltration of loading plate (3) two sides Native (7) flush the upper surface of the infiltration native (7) of backfill with loading plate (3) upper surface lowest point.
6. a kind of phreatic high is low as described in claim 1 fills out shallow cut subgrade in swelling soil zone construction method, it is characterised in that: institute In the step 6) stated, the method for filling bottom layer of subgrade packing layer (4) are as follows: fill bottom layer of subgrade in the upper surface of loading plate (3) and fill out The bed of material (4) makes the upper surface of bottom layer of subgrade packing layer (4) form the intermediate gradient at least 4% high, two sides are low.
7. a kind of phreatic high is low as described in claim 1 fills out shallow cut subgrade in swelling soil zone construction method, it is characterised in that: institute In the step 7) stated, the method for communicated drainage ditch (6) and the soil (7) that seeps water are as follows: on the side side wall of gutter (6) towards roadbed Multiple drain holes (8) are excavated along roadbed longitudinal gap, drain hole (8) extends laterally into infiltration native (7) along roadbed, high Degree is not higher than the upper surface of loading plate (3).
8. a kind of phreatic high is low as claimed in claim 7 fills out shallow cut subgrade in swelling soil zone construction method, it is characterised in that: Gutter (6) is towards excavating multiple drain holes (8) along 1~2m of roadbed longitudinal gap on the side side wall of roadbed.
9. a kind of phreatic high is low as claimed in claim 7 fills out shallow cut subgrade in swelling soil zone construction method, it is characterised in that: Excavate drain hole (8) in position of the side wall of gutter (6) towards roadbed side apart from bottom of trench 0.3m or more.
10. a kind of phreatic high as described in claim 1 or 4 is low to fill out shallow cut subgrade in swelling soil zone construction method, feature exists In: the loading plate (3) with a thickness of 0.3~1.0m is poured in Reinforced Concrete Raft plate (2) upper surface.
CN201811376694.3A 2018-11-19 2018-11-19 Construction method of high-groundwater-level low-filling shallow-excavation expansive soil subgrade Active CN109371763B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111395061A (en) * 2020-03-24 2020-07-10 中铁二院工程集团有限责任公司 Light roadbed structure of underpass operation bridge, design and construction method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4407747A1 (en) * 1994-03-08 1995-11-09 Porr Technobau Ag Train rail track securing system
BG61850B2 (en) * 1995-11-09 1998-07-31 Светомир АТАНАСОВ Railway road
CN202577167U (en) * 2012-03-07 2012-12-05 中铁第四勘察设计院集团有限公司 High groundwater level railway foundation bed and drainage structure
CN208072090U (en) * 2018-02-07 2018-11-09 中铁二院(成都)建设发展有限责任公司 A kind of lower soil property cutting high-speed railway ruggedized construction of bearing capacity
CN208072088U (en) * 2017-12-23 2018-11-09 中铁二院工程集团有限责任公司 Strong water abundant ground railway expensive soil cutting bedding construction

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4407747A1 (en) * 1994-03-08 1995-11-09 Porr Technobau Ag Train rail track securing system
BG61850B2 (en) * 1995-11-09 1998-07-31 Светомир АТАНАСОВ Railway road
CN202577167U (en) * 2012-03-07 2012-12-05 中铁第四勘察设计院集团有限公司 High groundwater level railway foundation bed and drainage structure
CN208072088U (en) * 2017-12-23 2018-11-09 中铁二院工程集团有限责任公司 Strong water abundant ground railway expensive soil cutting bedding construction
CN208072090U (en) * 2018-02-07 2018-11-09 中铁二院(成都)建设发展有限责任公司 A kind of lower soil property cutting high-speed railway ruggedized construction of bearing capacity

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111395061A (en) * 2020-03-24 2020-07-10 中铁二院工程集团有限责任公司 Light roadbed structure of underpass operation bridge, design and construction method

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