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A kind of equal-load displacement lightweight soil to help wide roadbed structure, design and construction method

A lightweight soil and roadbed technology, applied in the field of geotechnical engineering, can solve the problem of excessive vertical or lateral deformation of the existing ballastless railway subgrade, reduce the vertical or lateral deformation of the ballastless railway subgrade, affect the smoothness and Comfort and other issues, to achieve the effect of reducing ecological environment damage, reducing pile breakage or pile breakage, and reducing vertical or lateral deformation

Active Publication Date: 2022-03-08
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is: aiming at the prior art: when the subgrade section is connected to the existing railway and the side width structure of the ballastless railway subgrade is constructed, it is easy to cause the vertical or lateral deformation of the existing ballastless railway subgrade to exceed the limit, threatening the safety of the train operation, and it may also affect the smoothness and comfort of the new railway in the lead-in section. It provides a kind of equal-load replacement of light-weight soil side wide subgrade structure, design and construction method, which can greatly reduce the cost of new subgrade in the existing The base of the ballastless railway subgrade forms additional stress, minimizes the vertical or lateral deformation of the existing ballastless track subgrade, and greatly reduces the eccentric force of the new subgrade structure to the existing ballastless track subgrade, while greatly saving construction the land

Method used

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  • A kind of equal-load displacement lightweight soil to help wide roadbed structure, design and construction method
  • A kind of equal-load displacement lightweight soil to help wide roadbed structure, design and construction method
  • A kind of equal-load displacement lightweight soil to help wide roadbed structure, design and construction method

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Embodiment 1

[0060] Such as Figure 1-2 As shown, a kind of equal-load replacement lightweight soil side wide subgrade structure described in this embodiment, refer to figure 1 , the present invention replaces the wide subgrade structure of lightweight soil side with equal load, including composite lightweight piles 1, which are arranged vertically and horizontally at intervals in the foundation 5 adjacent to the existing ballastless track subgrade 6; Pile 1 pile top; connecting steel bars 3, one end of which is anchored into the pile body, and one end is fixedly connected with the light soil tank 2; the soil filler layer 4 is filled in the light soil tank 2.

[0061] In the above scenario:

[0062] refer to figure 2 , the composite lightweight pile 1 includes a pile-forming lightweight body 11 and a composite reinforced cage 12 embedded therein, and the composite reinforced cage 12 is composed of vertical geogrids 121 and vertically spaced The set annular geogrid 122 is formed, the ve...

Embodiment 2

[0066] Such as Figure 1-4 As shown, a kind of design method of equal-load replacement light soil side wide subgrade structure described in embodiment 1 described in this embodiment, the method comprises the following steps:

[0067] ①. Preliminary determination of composite lightweight pile 1 pile diameter d 0 , the unit is m; the length of one composite light pile is l, the unit is m; the distance between one composite light pile is s, the unit is m;

[0068] ②. Determine the total weight W of the lightweight soil tank 2, the soil filling layer 4 and the upper track structure by the following formula z :

[0069] W z =(B-0.5mh)shγ n1 +(B-2d-0.5mh n2 )( n2 -γ n1 )sh n2 +

[0070] 2sb 1 q 1 +(s 1 -b 1 ) sq 0 -(B-mh-0.5m△h)(γ-γ n1 )△hs

[0071] where W z is the total weight of light soil tank 2, soil filler layer 4 and upper track structure, in kN; B is the top width of side-width subgrade, in m; b is the bottom width of side-width subgrade, in m; m is the exis...

Embodiment 3

[0079] Such as Figure 1-4 As shown, this embodiment shows the design method of equal-load replacement of light-weight soil side wide subgrade structure. The specific design process: the design speed of a new high-speed railway is 300km / h, and the line spacing is s 1 4.8m To introduce the existing ballastless railway, it is necessary to fill the roadbed adjacent to the existing ballastless track with a height of 3.2m and a slope ratio of 1.5 for side width construction. The stratum is silty clay, and the gravity γ is 19kN / m 3 . In order to eliminate the influence of the side width roadbed on the existing ballastless railway, the design intends to adopt the equal load replacement light soil side width roadbed structure of the present invention. During the design process, the cantilever thickness d of the light weight soil tank 2 is 1.0m, and the The foundation depth Δh is 1.0m, and the weight of light soil γ n1 To take 5kN / m 3 , thickness of soil filling layer h n2 To take ...

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Abstract

The invention relates to the field of geotechnical engineering, in particular to a structure, design and construction method of an equal-load replacement light-weight soil side wide roadbed structure, wherein the roadbed structure includes a material storage tank with an open top, and one side of the material storage tank has an inclined Cantilever, and can be in contact with the slope of the existing ballastless track subgrade. There is a support beam at the bottom of the storage tank, and a reinforcement pile assembly is connected to the bottom of the support beam. The reinforcement pile assembly includes reinforcement piles. The inside of the storage tank is from top to bottom. Layers of soil filler and light soil layers are successively filled. An equal-load replacement light-weight soil side wide subgrade structure of the present invention reduces the upper load of the reinforcement pile assembly, and the uplift force on the side wall of the reinforcement pile can be transmitted back to the lower foundation through the anchorage of the pile body, which can not only effectively Controlling the uplift deformation of the side width structure of the subgrade can also effectively bear the overall load of the structure and control the settlement deformation; it greatly saves construction land and reduces the damage to the ecological environment.

Description

technical field [0001] The invention relates to the field of geotechnical engineering, in particular to a subgrade structure, design and construction method for equal-load replacement of light-weight soil with side width. Background technique [0002] In recent years, with the rapid development of engineering buildings, it is inevitable to build new buildings (structures) adjacent to existing buildings (structures). [0003] Under the additional load of new (structure) buildings, the existing buildings (structure) may have uneven settlement, tilt instability and other diseases, and even cause major safety accidents. The subgrade section is connected to the existing railway. At this time, the new project will face the problem of building the side width of the existing ballastless railway subgrade. If this kind of side width construction project is not handled properly, it will easily cause vertical or sideways damage to the existing ballastless railway subgrade. If the later...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01B2/00E02D5/34G06F30/13G06F30/20G06F119/14
CPCE01B2/006E02D5/34
Inventor 陈伟志闵卫鲸孙晓周成吴沛沛
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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