CN101173495B - Thick collapsible loess subgrade groundwork structure - Google Patents
Thick collapsible loess subgrade groundwork structure Download PDFInfo
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- CN101173495B CN101173495B CN2007100505966A CN200710050596A CN101173495B CN 101173495 B CN101173495 B CN 101173495B CN 2007100505966 A CN2007100505966 A CN 2007100505966A CN 200710050596 A CN200710050596 A CN 200710050596A CN 101173495 B CN101173495 B CN 101173495B
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- 239000002689 soil Substances 0.000 claims abstract description 15
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 11
- 239000004567 concrete Substances 0.000 claims description 52
- 229910000831 Steel Inorganic materials 0.000 claims description 44
- 239000010959 steel Substances 0.000 claims description 44
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- 239000012791 sliding layer Substances 0.000 claims description 5
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- 238000010276 construction Methods 0.000 abstract description 19
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Abstract
The invention discloses a deep collapsible loess roadbed, belonging to a foundation structure, comprising reinforced concrete piles (10), reinforced concrete joists (20), and reinforced concrete bearing sheets (30), wherein the reinforced concrete piles (10) are arranged in groups at intervals along the longitudinal direction of the foundation, the pile body is fixed with a bearing stratum after penetrating the soil in vertical direction; the reinforced concrete joists (20) are rigidly connected at the top of each group of reinforced concrete piles (10); the reinforced concrete bearing sheets(30), extending along the longitudinal direction of the foundation, are supported on the reinforced concrete joists (20) and connected with the reinforced concrete joists (20). The structure can strictly control settlement after construction and differential settlement of collapsible loess and deep collapsible loess foundation. The reinforced structure of the invention is a pile-slab system. The invention has the advantages of strong adaptability, good integral property, high stiffness, small deformation, great depth for dispose of poor soil layer and convenient construction. The invention successfully solves the technical problem of uneven settlement and large settlement due to the collapse, and can well meet the design requirements for passenger dedicated railway line with speed of up to300 to 350 km/h.
Description
Technical field
The present invention relates to the road foundation structure, particularly a kind of structure of deep collapsible loess subgrade ground.
Background technology
Collapsible loess is quarternary a kind of special deposit, it has the engineering properties of a series of uniquenesses, it has a lot of macroscopic macrovoids under native state, and often accompany because the formed piping porosity of biological agent, natural section becomes vertical joint, having certain opposing and move ability with densification, is a kind of unsaturated under-compacted soil.Under natural moisture, its compressibilty is lower, and intensity is higher, but when meeting water-soaked, the intensity of soil significantly reduces, the saturated yielding distortion that causes under additonal pressure or the gravity pressure at additonal pressure and soil, be the de-stabilise distortion that a kind of deflection is big, subsidence velocity is fast, big to engineering structures harmfulness.China railways is realizing great-leap-forward development, and Line for Passenger Transportation is more and more higher to the settlement request of foundation engineering, and strict settlement after construction control is had higher requirement to Measures for Making Ground and Foundation.Collapsible loess foundation, thick collapsed loess foundation particularly, owing to saturated yielding cause uneven settlement of foundation and settling amount excessive be long-standing technical barrier in the railway construction, conventional foundation treatment mode, fill out such as changing, ram by force, soak in advance etc., be difficult to meet design requirement.
Summary of the invention
Technical problem to be solved by this invention provides a kind of thick collapsible loess subgrade groundwork structure, and this foundation structure can strictly be controlled the settlement after construction and the relative settlement of collapsible loess, thick collapsed loess foundation.
The present invention solves this technical problem the technical scheme that is adopted: thick collapsible loess subgrade groundwork structure of the present invention, it is characterized in that it comprises: steel bar concrete pile, lay along ground longitudinal separation grouping, its pile body vertically penetrates behind the soil body fixed with bearing stratum; The steel concrete joist is rigidly connected with it at the top of each group steel bar concrete pile; The steel concrete bearing sheet along the ground longitudinal extension, is supported on the steel concrete joist and is attached thereto; Flexible cushion has been filled in the below of described steel concrete bearing sheet on the soil body, be equipped with the rigidity bed course between this flexible cushion and the steel concrete bearing sheet bottom surface.
The invention has the beneficial effects as follows, with the stake plate body is as ruggedized construction, have that compliance is strong, overall performance good, rigidity is big, distortion is little, it is big to handle bad soil depth, the characteristics of easy construction, and its top and ballastless track structure have better coupling, reasonable link, adapt to high speed traveling, can satisfy 300～350 kilometers passenger dedicated railway line designing requirement of design speed per hour well.Be used for collapsible loess foundation, particularly the thick collapsed loess foundation effect is remarkable, has successfully solved to be caused the technical barrier that differential settlement and settling amount are excessive by saturated yielding.
Description of drawings
This manual comprises following six width of cloth accompanying drawings:
Fig. 1 is the longitudinal section schematic diagram of thick collapsible loess subgrade groundwork structure of the present invention;
Fig. 2 is the sectional drawing along A-A line among Fig. 1;
Fig. 3 is the sectional view along B-B line among Fig. 1;
Fig. 4 is the vertical view of adjacent two single-unit bearing sheet binding sites in the thick collapsible loess subgrade groundwork structure of the present invention;
Fig. 5 is the longitudinal section schematic diagram of adjacent two single-unit bearing sheet binding sites in the thick collapsible loess subgrade groundwork structure of the present invention;
Fig. 6 is the longitudinal section schematic diagram of adjacent two single-unit bearing sheet binding sites in the thick collapsible loess subgrade groundwork structure of the present invention.
Member, toponym and pairing mark among the figure: steel bar concrete pile 10, steel concrete joist 20, gag lever post 21, steel concrete bearing sheet 30, single width bearing sheet 30a, single width bearing sheet 30b, single-unit bearing sheet 31, single-unit bearing sheet 32, single-unit bearing sheet 33, transverse expansion joint 34, longitudinal extension seam 35, stayed mast 36, guide thimble 37, limit casing 38, rigidity bed course 41, flexible cushion 42, sliding layer 43.
The specific embodiment
The present invention is further described below in conjunction with drawings and Examples.
With reference to Fig. 1, thick collapsible loess subgrade groundwork structure of the present invention comprises: steel bar concrete pile 10, to lay along the grouping of ground longitudinal separation, and it is fixed with bearing stratum that its pile body vertically penetrates the soil body (soft soil horizon, yellow soil horizon of collapsibility) back; Steel concrete joist 20 is arranged on the top of respectively organizing steel bar concrete pile 10 and is rigidly connected with it; Steel concrete bearing sheet 30 extends along the ground length direction, is supported on the steel concrete joist 20 and is attached thereto.With reference to Fig. 2 and Fig. 3, flexible cushion 42 has been filled in the below of described steel concrete bearing sheet 30 on the soil body, is equipped with rigidity bed course 41 between this flexible cushion 42 and steel concrete bearing sheet 30 bottom surfaces.With reference to Fig. 3, described steel concrete joist is equipped with rigid pad layer 41 20 times.The setting of rigidity bed course 41 can be played the effect of water proof, leveling and reinforcement substrate effectively, prevents that substrate from producing bigger relative settlement in concrete placement, also is convenient to the casting and constructing of steel concrete bearing sheet 30, steel concrete joist 20 simultaneously.Generally speaking, rigidity bed course 41 should adopt the C25 concrete to lay, and thickness is chosen as 0.1m, and flexible cushion 42 can adopt sixteen dirt to lay, and thickness is chosen as 0.4m.The present invention as ruggedized construction, has that compliance is strong, overall performance good with stake plate body system, and rigidity is big, distortion is little, and it is big to handle bad soil depth, and the characteristics of easy construction can satisfy well and design 300～350 kilometers passenger dedicated railway line designing requirement of speed per hour.Be used for collapsible loess foundation, particularly the thick collapsed loess foundation effect is remarkable, has successfully solved to be caused the technical barrier that differential settlement and settling amount are excessive by saturated yielding.
For railway ground, described steel concrete bearing sheet 30 vertically is combined into along ground by at least two single-unit bearing sheets usually, as shown in Figure 1 single- unit bearing sheet 31,32,33 etc.Two longitudinal ends of each single-unit bearing sheet overlap respectively on thereunder the steel concrete joist 20, vertically are rigidly connected with the steel concrete joist 20 at least two intervals between the two ends.Leave longitudinal extension seam 35 between the relative longitudinal terminal surface of adjacent two single-unit bearing sheets.With reference to Fig. 2, Fig. 3 and shown in Figure 4, as be used for the reinforcing of a double track railway roadbed, then described each single-unit bearing sheet laterally is combined into along ground by two single width bearing sheet 30a, 30b, leaves transverse expansion joint 34 between the relative transverse end surface of two single width bearing sheet 30a, 30b.With reference to Fig. 6, be equipped with sliding layer 43 between the steel concrete joist 20 of described single-unit bearing sheet two longitudinal ends and its below.Transverse expansion joint 34, longitudinal extension seam 35 and sliding layer 43 can reduce the influence of thermal stresses and creep of concrete etc.It is 2cm that 35 common width are stitched in transverse expansion joint 34, longitudinal extension, generally can fill in high resiliency polyamine fat in seam in the construction, and joint plate is set, and the seam version should adopt the pitch fibers material to make.Sliding layer 43 can preferably adopt PFY composite polyethylene geomembrane to make, its material technology index is: mass area ratio 250/0.25 (g/m), thickness 3.0mm ultimate strength 18.5kN/m, elongation at break 30～100%, tearing resistance 57kN/m, CBR bursting strength 2.93kN.
For improving the overall performance of stake plated construction system, can adopt or comprehensively adopt following technique measures:
With reference to Fig. 4 and Fig. 5, described single-unit bearing sheet is horizontally arranged at interval in the one longitudinal end along the guide thimble 37 of ground longitudinal extension, at the then corresponding stayed mast 36 that stretches in the guide thimble 37 that is provided with of longitudinal end of another adjacent with it single-unit bearing sheet.
With reference to Fig. 6, the lateral separation is set with the limit casing 38 of setting in the longitudinal end of described single-unit bearing sheet, the cross section of limit casing 38 is along the bar shaped of ground longitudinal extension, the then corresponding gag lever post 21 that upwards stretches in the limit casing 38 that is set with on the steel concrete joist 20 of its below.
The main muscle of described steel bar concrete pile 10 upwards penetrates steel concrete joist 20 and fixedlys connected with the main muscle of reinforced concrete bearing sheet 30.
The site operation of collapsible loess collapsible loess foundation structure of the present invention can carry out usually as follows:
(1) preparation of construction, construction plant should be removed foreign material, smooth compacting;
(2) the construction reinforced bar concrete pipe base 10, and sequence of construction is: test setting-out, auger is in place, boring, pore-forming detect, clear hole, clear hole detection, descending reinforcing cage, concrete perfusion;
(3) construction reinforced bar concrete joist 20, sequence of construction is: excavation of foundation pit, cut pile crown, steel bar concrete pile 10 nondestructive testings, lay substrate bed course (rigidity bed course 41), reinforcing bar binding, formwork erection, concrete perfusion, form removal maintenance, pit backfill;
(4) construction reinforced bar concrete bearing platform plate 30, sequence of construction is: excavation of foundation pit, 20 nondestructive testings of steel concrete joist, laying substrate bed course (flexible cushion 42, rigidity bed course 41), reinforcing bar binding, formwork erection, concreting, form removal maintenance, pit backfill.
Claims (8)
1. thick collapsible loess subgrade groundwork structure is characterized in that it comprises: steel bar concrete pile (10), to lay along the grouping of ground longitudinal separation, and its pile body vertically penetrates behind the soil body fixed with bearing stratum; Steel concrete joist (20) is rigidly connected with it at the top of each group steel bar concrete pile (10); Steel concrete bearing sheet (30) along the ground longitudinal extension, is supported on the steel concrete joist (20) and is attached thereto; Flexible cushion (42) has been filled in the below of described steel concrete bearing sheet (30) on the soil body, be equipped with rigidity bed course (41) between this flexible cushion (42) and steel concrete bearing sheet (30) bottom surface.
2. thick collapsible loess subgrade groundwork structure according to claim 1, it is characterized in that: described steel concrete bearing sheet (30) vertically is combined into along ground by at least two single-unit bearing sheets; Two longitudinal ends of each single-unit bearing sheet overlap respectively on thereunder the steel concrete joist (20), vertically are rigidly connected with the steel concrete joist (20) at least two intervals between the two ends; Leave longitudinal extension seam (35) between the relative longitudinal terminal surface of adjacent two single-unit bearing sheets.
3. as thick collapsible loess subgrade groundwork structure as described in the claim 2, it is characterized in that: described single-unit bearing sheet lateral separation in the one longitudinal end is embedded with the guide thimble (37) along the ground longitudinal extension, the longitudinal end of another adjacent with it single-unit bearing sheet then correspondence be provided with the stayed mast (36) that stretches in the guide thimble (37).
4. as thick collapsible loess subgrade groundwork structure as described in the claim 3, it is characterized in that: the lateral separation is set with the limit casing (38) of setting in the longitudinal end of described single-unit bearing sheet, the cross section of limit casing (38) is along the bar shaped of ground longitudinal extension, on the steel concrete joist (20) of its below then correspondence be set with the gag lever post (21) that upwards stretches in the limit casing (38).
5. as thick collapsible loess subgrade groundwork structure as described in the claim 4, it is characterized in that: be equipped with sliding layer (43) between the steel concrete joist (20) of described single-unit bearing sheet two longitudinal ends and its below.
6. as thick collapsible loess subgrade groundwork structure as described in the claim 1,2,3 or 4, it is characterized in that: described each single-unit bearing sheet laterally is combined into along ground by two single width bearing sheets (30a, 30b), leaves transverse expansion joint (34) between the relative transverse end surface of two single width bearing sheets (30a, 30b).
7. thick collapsible loess subgrade groundwork structure according to claim 1 is characterized in that: be equipped with rigid pad layer (41) under the described steel concrete joist (20).
8. thick collapsible loess subgrade groundwork structure according to claim 1, it is characterized in that: the main muscle of described steel bar concrete pile (10) upwards penetrates steel concrete joist (20) and fixedlys connected with the main muscle of reinforced concrete bearing sheet (30).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100505966A CN101173495B (en) | 2007-11-23 | 2007-11-23 | Thick collapsible loess subgrade groundwork structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100505966A CN101173495B (en) | 2007-11-23 | 2007-11-23 | Thick collapsible loess subgrade groundwork structure |
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| Publication Number | Publication Date |
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| CN101173495A CN101173495A (en) | 2008-05-07 |
| CN101173495B true CN101173495B (en) | 2010-06-09 |
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| CN105040720A (en) * | 2015-07-31 | 2015-11-11 | 上海市政工程设计研究总院（集团）有限公司 | Anti-settling foundation structure |
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| CN111424481B (en) * | 2020-03-10 | 2021-05-25 | 西南交通大学 | A kind of expansive soil cutting structure |
| CN111270570B (en) * | 2020-03-16 | 2024-06-18 | 中铁二院工程集团有限责任公司 | Overhead soilless roadbed structure, roadbed assembly, roadbed system and construction method |
| CN111235969A (en) * | 2020-03-16 | 2020-06-05 | 中铁二院工程集团有限责任公司 | Overhead roadbed structure, roadbed assembly, roadbed system and construction method |
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