CN201991012U - Composite pile foundation for treating railway soft soil foundation - Google Patents

Composite pile foundation for treating railway soft soil foundation Download PDF

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Publication number
CN201991012U
CN201991012U CN 201120034624 CN201120034624U CN201991012U CN 201991012 U CN201991012 U CN 201991012U CN 201120034624 CN201120034624 CN 201120034624 CN 201120034624 U CN201120034624 U CN 201120034624U CN 201991012 U CN201991012 U CN 201991012U
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China
Prior art keywords
stake
foundation
stressed
composite pile
main stress
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Expired - Lifetime
Application number
CN 201120034624
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Chinese (zh)
Inventor
孙红林
顾湘生
蒋兴锟
赵新益
熊林敦
陈尚勇
李丹
黄三强
刘好正
彭志鹏
沈伟升
余雷
朱先锋
吴成杰
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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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Priority to CN 201120034624 priority Critical patent/CN201991012U/en
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Publication of CN201991012U publication Critical patent/CN201991012U/en
Anticipated expiration legal-status Critical
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Abstract

The utility model discloses a composite pile foundation for treating a railway soft soil foundation, which comprises primary stressed piles and secondary stressed piles. The primary stressed piles are arranged in an embankment core stress area, the secondary stressed piles are arranged outside the embankment core stress area, the embankment core stress area is an area below 45-angle spread angle ranges on two sides of a ballastless track support layer, a hardcore bed is arranged at the tops of the primary stressed piles and the secondary stressed piles, and a reinforced concrete raft is arranged at the top of the hardcore bed. The reinforced concrete raft is added to the top of the hardcore bed at the tops of the primary stressed piles, so that foundation settlement can be reduced effectively, stability of a low embankment under long-term load effect of a train can be guaranteed, and the composite pile foundation is simple in structure, convenient in construction, applicable to treatment of the soft soil foundation.

Description

A kind of composite pile foundation that is used to handle the railway soft foundation
Technical field
The utility model relates to a kind of pile foundation, particularly a kind of composite pile foundation that is used to handle the railway soft foundation.
Background technology
High-speed railway requires very strict to the settlement after construction of roadbed---and have the requirement of tiny fragments of stone, coal, etc. track to be not more than 100~150mm, non-fragment orbit is not more than 15mm, and CFG stake net composite foundation is one of present high-speed railway soft foundation main methods.But there are the following problems for CFG stake net composite foundation:
1, to low light fill, under the long term of train dynamic load, geo-grid can produce creep, and the soil arch that the stake top forms may be destroyed, and can not guarantee the long-time stability of bedding;
2, because the embankment load is generally less, the intensity performance degree of CFG stake is low, causes waste.
Summary of the invention
In order to solve in the prior art owing to hang down light fill under the long term of train dynamic load, geo-grid may produce bigger creep, the soil arch that causes the stake top to form may be destroyed, the intensity of CFG stake is brought into play the low problem of degree simultaneously, and the utility model embodiment provides a kind of composite pile foundation that is used to handle the railway soft foundation.Described technical scheme is as follows:
A kind of composite pile foundation that is used to handle the railway soft foundation, comprise: be positioned at the main stress stake in the stressed district of core of bank and be positioned at inferior stressed stake outside the stressed district of core of bank, the stressed district of described core of bank is following zone in the 45 ° of angle of flare scopes in non-fragment orbit supporting layer both sides, described main stress stake and time stressed stake stake top are provided with hardcore bed, and the hardcore bed end face that is positioned at described main stress stake stake top is provided with steel concrete raft plate.
Particularly, the spacing of described main stress stake is the diameter of 5~6 times of stakes, and like this, the intensity of main stress stake performance degree height has been saved cost.
Further, the thickness of described steel concrete raft plate is 0.4~0.6m, and this thickness has been avoided the punching failure of stake to steel concrete raft plate, has reduced foundation settlement, has guaranteed the long-time stability of bedding.
Further, the thickness of the hardcore bed that described main stress stake stake top is provided with is 0.1~0.3m, and this thickness can be adjusted a distribution of top stress, and assurance stake soil is born load jointly.
Again further, be positioned at the middle geo-grid that is equipped with of the hardcore bed in the stressed stake described time, the end face of described main stress stake stake top steel concrete raft plate is concordant with time stressed stake stake top hardcore bed end face, is convenient to follow-up construction like this.
The beneficial effect that the technical scheme that the utility model embodiment provides is brought is: compared to existing technology, the utility model embodiment is by adding steel concrete raft plate at the hardcore bed end face that is positioned at described main stress stake stake top, because the decrement of stake-raft plated construction system is very little, and the stake end enters relative hard formation, therefore can effectively reduce foundation settlement, can also guarantee the low stability of light fill under the long-term dynamic load effect of train, and simple in structure, easy construction.In addition,, reach 5~6 times of stake footpaths, can more make full use of strength of the mixing pile, saved cost because pile spacing of the present utility model is bigger than composite foundation.
Description of drawings
Fig. 1 is the construction status architecture schematic diagram of the composite pile foundation that is used for the high-speed railway soft foundation that provides among the utility model embodiment.
Among the figure, 1 main stress stake, 2 stressed stakes, 3 hardcore beds, 4 steel concrete raft plates, 5 geo-grid, 6 beddings, 7 tracks, 8 crust layers, 9 weak soil layers, 10 relative hard formations.
The specific embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, the utility model embodiment is described in further detail below in conjunction with accompanying drawing.
As shown in Figure 1, a kind of composite pile foundation that is used to handle the railway soft foundation that the utility model provides, comprise: be positioned at the main stress stake 1 and the inferior stressed stake 2 that is positioned at outside the stressed district of core of bank in the stressed district of core of bank, the stressed district of described core of bank is following zone in the 45 ° of angle of flare scopes in non-fragment orbit supporting layer both sides, described main stress stake 1 and time 2 tops of stressed stake are provided with hardcore bed 3, and hardcore bed 3 end faces that are positioned at 1 top of described main stress stake are provided with steel concrete raft plate 4.The spacing of described main stress stake 1 is the diameter of 5~6 times of stakes, and like this, the intensity of main stress stake 1 performance degree height has been saved cost.The thickness of described steel concrete raft plate 4 is 0.4~0.6m, and this thickness has been avoided the punching failure of stake to steel concrete raft plate 4, has reduced foundation settlement, has guaranteed the long-time stability of bedding 6.The thickness of the hardcore bed 3 that 1 top of described main stress stake is provided with is 0.1~0.3m, and this thickness can be adjusted a distribution of top stress, and assurance stake soil is born load jointly.Be equipped with geo-grid 5 in the middle of being positioned at described the hardcore bed 3 in the stressed stake 2, the end face of 1 top of described main stress stake steel concrete raft plate 4 is concordant with time 2 top hardcore bed 3 end faces of stressed stake, is convenient to follow-up construction like this.
When the utility model is specifically implemented, soft foundation to below, the stressed district of the core of embankment (in the 45 ° of angle of flare scopes in non-fragment orbit supporting layer both sides), adopt composite pile foundation described in the utility model to handle, the stake end of above-mentioned main stress stake 1 and time stressed stake 2 should penetrate weak soil layer 9 and enter relative hard formation 10 certain depths; And a stake end stratum can not be too hard, must can guarantee described main stress stake 1 with inferior stressed 2 be friction pile; Described in addition main stress stake 1 should be adopted semi-rigid stake, for example Low Intensity Concrete Piles, CFG stake etc., and described stressed stake can be adopted semi-rigid stake or flexible pile, for example Low Intensity Concrete Piles, CFG stake, agitation pile etc.; Arrangement of reinforcement is determined according to structural calculation in the thickness of described steel concrete raft plate 4 and the plate.Described steel concrete raft 4 plate both sides grounds adopt stake net composite foundation to handle.After composite pile foundation of the present utility model has been constructed, lay bedding 6 and track 7 etc. more above it.
The above only is preferred embodiment of the present utility model, and is in order to restriction the utility model, not all within spirit of the present utility model and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.

Claims (5)

1. composite pile foundation that is used to handle the railway soft foundation, comprise: be positioned at the main stress stake in the stressed district of core of bank and be positioned at inferior stressed stake outside the stressed district of core of bank, the stressed district of described core of bank is following zone in the 45 ° of angle of flare scopes in non-fragment orbit supporting layer both sides, described main stress stake and time stressed stake stake top are provided with hardcore bed, it is characterized in that the hardcore bed end face that is positioned at described main stress stake stake top is provided with steel concrete raft plate.
2. a kind of composite pile foundation that is used to handle the railway soft foundation according to claim 1 is characterized in that the spacing of described main stress stake is the diameter of 5~6 times of stakes.
3. a kind of composite pile foundation that is used to handle the railway soft foundation according to claim 1 and 2 is characterized in that the thickness of described steel concrete raft plate is 0.4~0.6m.
4. a kind of composite pile foundation that is used to handle the railway soft foundation according to claim 1 and 2 is characterized in that, the thickness of the hardcore bed that described main stress stake stake top is provided with is 0.1~0.3m.
5. a kind of composite pile foundation that is used to handle the railway soft foundation according to claim 1 and 2, it is characterized in that, be equipped with geo-grid in the middle of being positioned at described the hardcore bed in the stressed stake, the end face of described main stress stake stake top steel concrete raft plate is concordant with time stressed stake stake top hardcore bed end face.
CN 201120034624 2011-01-30 2011-01-30 Composite pile foundation for treating railway soft soil foundation Expired - Lifetime CN201991012U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201120034624 CN201991012U (en) 2011-01-30 2011-01-30 Composite pile foundation for treating railway soft soil foundation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201120034624 CN201991012U (en) 2011-01-30 2011-01-30 Composite pile foundation for treating railway soft soil foundation

Publications (1)

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CN201991012U true CN201991012U (en) 2011-09-28

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102535500A (en) * 2012-02-28 2012-07-04 上海现代建筑设计(集团)有限公司 Reducing and sinking pile-supported embankment for treating soft soil foundation under large-area stacked load at ground and design method for reducing and sinking pile-supported embankment
CN104153402A (en) * 2014-08-22 2014-11-19 中国建筑西南勘察设计研究院有限公司 Anti-floating pile composite foundation
CN105696426A (en) * 2016-04-06 2016-06-22 中铁第四勘察设计院集团有限公司 Construction method for treating adjacent existing railway line soft soil foundation and roadbed structure thereof
CN105714843A (en) * 2015-12-16 2016-06-29 中铁二院工程集团有限责任公司 Deep soft soil branch pile foundation strengthening structure
CN107268465A (en) * 2017-08-03 2017-10-20 中铁第勘察设计院集团有限公司 Deep embeded type stake, compound contignation and its construction method of culvert are set in karst region
CN110952388A (en) * 2019-12-17 2020-04-03 同济大学 High-speed railway wide roadbed compaction pile combined pile network foundation structure and design method
CN111188236A (en) * 2020-01-16 2020-05-22 西南交通大学 Soft soil foundation reinforcing structure under high embankment

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102535500A (en) * 2012-02-28 2012-07-04 上海现代建筑设计(集团)有限公司 Reducing and sinking pile-supported embankment for treating soft soil foundation under large-area stacked load at ground and design method for reducing and sinking pile-supported embankment
CN104153402A (en) * 2014-08-22 2014-11-19 中国建筑西南勘察设计研究院有限公司 Anti-floating pile composite foundation
CN105714843A (en) * 2015-12-16 2016-06-29 中铁二院工程集团有限责任公司 Deep soft soil branch pile foundation strengthening structure
CN105696426A (en) * 2016-04-06 2016-06-22 中铁第四勘察设计院集团有限公司 Construction method for treating adjacent existing railway line soft soil foundation and roadbed structure thereof
CN105696426B (en) * 2016-04-06 2018-06-12 中铁第四勘察设计院集团有限公司 It is a kind of to handle the construction method and its road structure for closing on both wired soft soil foundations
CN107268465A (en) * 2017-08-03 2017-10-20 中铁第勘察设计院集团有限公司 Deep embeded type stake, compound contignation and its construction method of culvert are set in karst region
CN110952388A (en) * 2019-12-17 2020-04-03 同济大学 High-speed railway wide roadbed compaction pile combined pile network foundation structure and design method
CN111188236A (en) * 2020-01-16 2020-05-22 西南交通大学 Soft soil foundation reinforcing structure under high embankment

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Granted publication date: 20110928