CN102296508A - Variable-stiffness composite foundation for highway - Google Patents
Variable-stiffness composite foundation for highway Download PDFInfo
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- CN102296508A CN102296508A CN2011101675829A CN201110167582A CN102296508A CN 102296508 A CN102296508 A CN 102296508A CN 2011101675829 A CN2011101675829 A CN 2011101675829A CN 201110167582 A CN201110167582 A CN 201110167582A CN 102296508 A CN102296508 A CN 102296508A
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Abstract
The invention relates to a variable-stiffness composite foundation for a highway. A purpose of the present invention is to provide a variable-stiffness composite foundation for a highway, wherein the composite foundation can regulate the differential settlement between a bridge head section of the highway and a transition section of the highway. The technical scheme for realizing the purpose of the present invention is that: the variable-stiffness composite foundation for the highway comprises the bridge head section and the transition section; in the bridge head section and the transition section, pile lengths or pile spaces of foundations piles are variable.
Description
Technical field
The invention belongs to the highway construction field, be specifically related to a kind of speedway and become the rigidity composite foundation.
Background technology
The principal element that causes pavement cracking and jumping car is the relative settlement (differential settlement) of roadbed, in other words, under the bigger situation of roadbed structural strain's, if settling ratio is more even, then can not produce harmful effect to driving; If opposite sedimentation is inhomogeneous, even maximum settlement or average settlement are controlled in a certain scope, the relative settlement of existence also causes the cracking on road surface easily or causes jumps the car phenomenon.Therefore, from the science and the importance of evaluation index, relative settlement is a governing factor more more crucial than maximum settlement.Particularly when clay distribution differed greatly, it is particularly important that the control of relative settlement seems.
Yet, in present ground Treatment Design, general only consider how to control maximum settlement and ignored control relative settlement.What usually adopted in the composite foundation cross section in traditional highway soft foundation Treatment Design is the mode that lays out pile that waits the long grade of stake pilespacing.The mode of laying out pile of even now can be controlled the maximum settlement or the average settlement of ground effectively, but the lateral variation sedimentation is still inevitable.The mode that lays out pile of end of the bridge section and changeover portion pilespacing such as also stake such as employing is long usually, end of the bridge section and changeover portion difference are the different of the long or pilespacing of stake, then between end of the bridge section and changeover portion,, can produce bigger longitudinal difference sedimentation because stake is long or the sudden change of pilespacing.The caused relative settlement of this conventional design meeting causes that the high sedimentation basin in low both sides, a lot of serious consequences: ⑴ middle part causes surface drainage in rainy season not smooth easily, the road-center position produces ponding, even in design, reserve 2% road horizontal wall inscription, still keep away middle part, unavoidable road surface ponding problem; ⑵ the relative settlement meeting of end of the bridge section and changeover portion is transmitted to the road surface gradually, thereby makes the road surface that laterally cracking take place.
From adjusting the angle of relative settlement because above embankment and the supercrust rigidity in stake top is limited, its to the effect of contraction of pile body a little less than, can not coordinate the relative settlement between each well.Therefore in the ground processing procedure, suitably carrying out the long and pilespacing adjustment of stake is to adjust the most feasible mode of relative settlement with the distribution rigidity of reasonably optimizing stake, also is the problem that presses for solution in the current design.
Summary of the invention
The objective of the invention is to overcome the defective of prior art, provide a kind of speedway that can adjust the relative settlement of speedway end of the bridge section and changeover portion to become the rigidity composite foundation.
The technical scheme that realizes the object of the invention is:
Speedway becomes the rigidity composite foundation, comprises end of the bridge section and changeover portion, and in described end of the bridge section and the changeover portion, the long or pilespacing of the stake of foundation pile changes.
Long or the pilespacing of stake in described end of the bridge section or the changeover portion changes, and further comprises following technical proposal:
(1) technical scheme of the long change pilespacing of stake such as
The foundation pile of described end of the bridge section and changeover portion is isometric, in described end of the bridge section, on the cross section along with the increase of embankment center radial distance, the foundation pile pilespacing increases gradually; In described changeover portion, on the cross section along with the increase of foundation pile and embankment center radial distance and with the increase of end of the bridge axial distance, pilespacing increases gradually.
(2) etc. pilespacing becomes the long technical scheme of stake
The foundation pile of described end of the bridge section and changeover portion is equidistant, in described end of the bridge section, on the cross section foundation pile along with the increase of embankment center radial distance, stake is long to be increased gradually; In described changeover portion, on the cross section along with the increase of foundation pile and embankment center radial distance and with the increase of end of the bridge axial distance, stake is long to increase gradually.
Beneficial effect of the present invention is:
(1) after ground adopted composite foundation to handle, the maximum shear stress field was transferred to below the point, in the diffusion of ground depths, increases the stability of ground; Deng the long change pilespacing scheme of stake and wait pilespacing to become the rectangular case of stake and compare, the scope of the maximum shear stress field of the former pile body is bigger, and promptly the former can more effectively stop the lateral displacement of foundation soil body.
(2) become the rigidity composite foundation and can reduce highway, and wait the long change pilespacing of stake scheme, more can improve road-ability in pilespacing change rectangular cases such as the effect aspect the longitudinal difference settlement Control are better than in length and breadth to relative settlement.
(3) etc. the total cost of the long change pilespacing of stake scheme the rigidity Design scheme such as compares and has saved about 30%; Saved about about 24% Deng rigidity Design schemes such as the total cost of the pilespacing change rectangular case of stake compare.Become the rigidity composite foundation and can produce remarkable economic efficiency.
(4), become the pilespacing scheme and all be better than becoming the rectangular case of stake from many-sides such as design, construction control, quality examination, construction costs and field trial effects.
(5) become rigidity composite foundation method for designing and can effectively slow down the sedimentation of roadbed longitudinal difference, improve road-ability, also can save construction costs significantly simultaneously, remarkable economic efficiency and wide application prospect are arranged.
Description of drawings
Fig. 1 is the cross-sectional view of the embodiment of the invention 1;
Fig. 2 is the A-A sectional view of Fig. 1;
Fig. 3 is the cross-sectional view of the embodiment of the invention 2
Fig. 4 is the B-B sectional view of Fig. 3;
Fig. 5 is the C-C sectional view of Fig. 3.
The specific embodiment
The present invention realizes the gradual change of foundation stiffness, thereby reaches the purpose that reduces the relative settlement of roadbed vertical, horizontal by adjusting the long or pilespacing of stake of composite foundation.Be described further below in conjunction with embodiment and accompanying drawing.
Present embodiment is the embodiment that waits the speedway change rigidity composite foundation of the long change pilespacing of stake.
As illustrated in fig. 1 and 2, speedway becomes rigidity composite foundation 100, comprises end of the bridge section 1 and changeover portion 2.
As shown in Figure 2, the foundation pile 3 of end of the bridge section 1 and changeover portion 2 is isometric.As shown in Figure 1, in end of the bridge section 1, on the cross section along with the increase of embankment center 4 radial distances, foundation pile 3 pilespacings increase gradually; In changeover portion 2, on the cross section along with the increase of foundation pile and embankment center 4 radial distances and with the increase of end of the bridge section axial distance, pilespacing increases gradually.
Present embodiment is to wait pilespacing to become the embodiment that the long speedway of stake becomes the rigidity composite foundation.
As shown in Figure 3, the foundation pile 3 of end of the bridge section 1 and changeover portion 2 is equidistant.As shown in Figure 4, in end of the bridge section 1, on the cross section along with the increase of embankment center 4 radial distances, 3 of foundation pile are long to be increased gradually.As shown in Figure 5, in changeover portion 2, on the cross section along with the increase of foundation pile and embankment center 4 radial distances and with the increase of end of the bridge section axial distance, stake is long to increase gradually.
Claims (3)
1. speedway becomes the rigidity composite foundation, comprises end of the bridge section (2) and changeover portion (1), it is characterized in that, in described end of the bridge section (2) and the changeover portion, the long or pilespacing of foundation pile (3) changes.
2. speedway according to claim 1 becomes the rigidity composite foundation, it is characterized in that the foundation pile of described end of the bridge section and changeover portion is isometric, in described end of the bridge section (1), on the cross section along with the increase of embankment center radial distance, the foundation pile pilespacing increases gradually; In described changeover portion (2), on the cross section along with the increase of foundation pile and embankment center (4) radial distance and with the increase of end of the bridge section (2) axial distance, pilespacing increases gradually.
3. speedway according to claim 1 becomes the rigidity composite foundation, it is characterized in that the foundation pile of described end of the bridge section and changeover portion is equidistant, in described end of the bridge section (1), on the cross section foundation pile along with the increase of embankment center (4) radial distance, stake is long to be increased gradually; In described changeover portion (2), on the cross section along with the increase of foundation pile and embankment center (4) radial distance and with the increase of end of the bridge section (2) axial distance, stake is long to increase gradually.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101675829A CN102296508A (en) | 2011-06-20 | 2011-06-20 | Variable-stiffness composite foundation for highway |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101675829A CN102296508A (en) | 2011-06-20 | 2011-06-20 | Variable-stiffness composite foundation for highway |
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| CN102296508A true CN102296508A (en) | 2011-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011101675829A Pending CN102296508A (en) | 2011-06-20 | 2011-06-20 | Variable-stiffness composite foundation for highway |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103046532A (en) * | 2012-12-31 | 2013-04-17 | 中国建筑西南勘察设计研究院有限公司 | Variable stiffness leveling prestressed pipe pile compound foundation |
| CN103510533A (en) * | 2012-06-15 | 2014-01-15 | 中国石油化工股份有限公司 | Rigidity-variable round raft foundation of steel storage tank |
| CN107808026A (en) * | 2017-09-14 | 2018-03-16 | 南京瑞迪建设科技有限公司 | A kind of storage tank composite foundation variable-stiffness leveling Optimization Design |
| CN110952389A (en) * | 2019-12-17 | 2020-04-03 | 同济大学 | Pile combined structure construction method for controlling uneven settlement of transition section of high-speed railway bridge |
| CN111364307A (en) * | 2020-04-10 | 2020-07-03 | 南通大学 | Roadbed reinforcing structure of road and bridge connecting section and construction process thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201850505U (en) * | 2010-11-18 | 2011-06-01 | 中交第一公路勘察设计研究院有限公司 | Rigid-flexible transition structure capable of preventing bumping at bridge-head |
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2011
- 2011-06-20 CN CN2011101675829A patent/CN102296508A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201850505U (en) * | 2010-11-18 | 2011-06-01 | 中交第一公路勘察设计研究院有限公司 | Rigid-flexible transition structure capable of preventing bumping at bridge-head |
Non-Patent Citations (2)
| Title |
|---|
| 孙红亮，马战旗，刘海军: "变桩长技术在处理桥头跳车中的数值模拟分析", 《福建建材》 * |
| 崔毓善，刘亚娟，杨晓华: "桩筏体系在处治桥头跳车病害中的应用", 《筑路机械与施工机械化》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103510533A (en) * | 2012-06-15 | 2014-01-15 | 中国石油化工股份有限公司 | Rigidity-variable round raft foundation of steel storage tank |
| CN103510533B (en) * | 2012-06-15 | 2015-09-02 | 中国石油化工股份有限公司 | Rigidity-variable round raft foundation of steel storage tank |
| CN103046532A (en) * | 2012-12-31 | 2013-04-17 | 中国建筑西南勘察设计研究院有限公司 | Variable stiffness leveling prestressed pipe pile compound foundation |
| CN107808026A (en) * | 2017-09-14 | 2018-03-16 | 南京瑞迪建设科技有限公司 | A kind of storage tank composite foundation variable-stiffness leveling Optimization Design |
| CN110952389A (en) * | 2019-12-17 | 2020-04-03 | 同济大学 | Pile combined structure construction method for controlling uneven settlement of transition section of high-speed railway bridge |
| CN111364307A (en) * | 2020-04-10 | 2020-07-03 | 南通大学 | Roadbed reinforcing structure of road and bridge connecting section and construction process thereof |
| CN111364307B (en) * | 2020-04-10 | 2021-11-30 | 南通大学 | Roadbed reinforcing structure of road and bridge connecting section and construction process thereof |
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Application publication date: 20111228 |