CN204849508U - Roadbed structure of soft soil foundation highway road bridge changeover portion - Google Patents
Roadbed structure of soft soil foundation highway road bridge changeover portion Download PDFInfo
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- CN204849508U CN204849508U CN201520512565.8U CN201520512565U CN204849508U CN 204849508 U CN204849508 U CN 204849508U CN 201520512565 U CN201520512565 U CN 201520512565U CN 204849508 U CN204849508 U CN 204849508U
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Abstract
The utility model discloses a roadbed structure of soft soil foundation highway road bridge changeover portion, it is through burying tubular product underground in the road bed work progress to in that wherein the backing sand is perhaps native, after the construction of road bed body is accomplished, transport sand or soil, trade and fill out foam concrete, play surcharge preloading and reduced the effect that the ground subsides, reduced the road bed dead weight, reduced the road bed accumulation and subsided, obviously reduced weak soil foundation stabilization processing costs and shortened the time limit for a project.
Description
Technical field
The utility model belongs to technical field of civil engineering, is specifically related to a kind of road structure of Freeway on Soft Ground road-bridge transition section.
Background technology
High-grade highway (comprising speedway) after operation is open to traffic soon, ubiquity problem: roadbed occurs sedimentation in various degree at the position adjacent with abutment, bridge is sedimentation hardly then, the sedimentation official post vehicle at this position by time produce and jump and impact, thus additional impact load is caused to bridges and culverts and road surface, make driver and passenger feel discomfort of jolting, even cause vehicle deceleration, serious caused traffic accident, affects traffic safety; Especially for expressway bridge head roadbed on soft foundation, often just need keep in repair every 2-3, often cause operation costs expensive.Therefore, problem of bumping at bridge-head is technical barrier in the urgent need to address.
Bumping at bridge-head on soft foundation is the technical problem of a more complicated, usually by the impact of many uncertain factors, as weak soil thickness and character thereof, the effect for the treatment of of soft foundation, roadbed filling height, the construction quality of bridge back filling, design parameters, settlement calculation method, irrational design, construction and management etc.Usually the main cause that bumping at bridge-head produces can be summarised as the following aspects:
(1) the bad sedimentation caused of ground soil property; Bridges and culverts is usually located at place, gully, and groundwater table is higher, has weak soil in southern area more, this type of native natural moisture content is greater than liquid limit, and natural void ratio is large, normal containing organic, compressibilty is high, and shear strength is low, once be disturbed, natural structure is easily damaged, and intensity just significantly reduces, and Bridgehead by Blastig filled height is larger, generation base stress is relatively large, under Vehicle Load, more easily cause the subsidence of foundations, and stabilization lasts and often lasts for several years and even many decades.Time filling roadbed on soft foundation, weak soil can be made to produce immediate settlement, primary consolidation sedimentation and secondary consolidation settlement.
(2) bridge back filling compression causes the sedimentation of roadbed; Because the platform back of the body work plane when road roller rolls that bankets is little, particularly around embed-type pillar abutment platform cap, general road roller cannot operation, this just causes the fill compaction degree on bridge approach and cone slope not reach standard, under the repeated action of wheel load, roadbed filling is compressed gradually, after being open to traffic, produce Compression Settlement in a period of time.
(3) depression that causes of hard and soft sudden change; Bridge is normally supported on the rigid structures on rock stratum, has larger integral rigidity, and the relative flexible body that belongs to of road be connected with it, there is the larger characteristic of the little flexibility of rigidity, belong to elasticoplastic body.Obviously, the existence of this poor rigidity must cause between road and abutment and produces larger elasticity and plastic strain difference.
Along with the fast development of speedway, in order to ensure vehicle high-speed, safety and even running, in design life, the settlement amount after construction on general provision road surface should be less than 30cm, and approach embankment relative settlement should be less than 10cm.And the weak soil of deep compression layer and mollisol roadbed are difficult to meet above-mentioned requirements, so consolidation process must be carried out to the ground of roadbed laying place before roadbed paving; Method conventional at present mainly contains discharging consolidation, cement mixing pile, embankment stake etc.Consolidation is both economical, but ensures that time duration of abundant precompressed is long; Embankment stake expressway bridge head of being everlasting is arranged, and reduce relative settlement Be very effective, but cost is higher.
Therefore need exploitation one badly and both meet road-bridge transition section relative settlement requirement, road structure both economical again while that the duration being shorter.
Summary of the invention
The utility model provides a kind of road structure of Freeway on Soft Ground road-bridge transition section, has both met road-bridge transition section relative settlement requirement, both economical again while that the duration being shorter.
A road structure for Freeway on Soft Ground road-bridge transition section, comprises soft foundation; Soft foundation is provided with roadbed, and roadbed is equipped with road surface structare layer; Some tubing is embedded with side by side perpendicular to direction of traffic, containing filler in described tubing in the roadbed of abutment.
Further, described tubing is imbedded and is filled soil or sand in tubing in roadbed filling process, after roadbed filling completes, changes and fill out as foam concrete in described tubing; The effect of surcharge preloading and reduction foundation settlement can be played.
Further, in described soft foundation, corresponding tubing position is provided with basement process structure, and coordinate basement process, the surcharge preloading in roadbed filling, can effectively reduce relative settlement between road and bridge, prevents " bumping at bridge-head " phenomenon.
The utility model reduces the load of roadbed body, can arrange the spacing of multi coil material and adjustment tubing as required, realize loss of weight ratio in various degree.
Advantageous Effects of the present utility model is: can reduce roadbed deadweight, reduce roadbed cumulative settling, obviously reduce reinforced soft soil ground disposal cost, and shorten the duration.
Accompanying drawing explanation
Fig. 1 is the schematic cross-sectional view of the utility model road structure.
Fig. 2 is the schematic longitudinal section of the utility model road structure.
Fig. 3 is the construction schematic diagram of the utility model road structure.
Wherein: 1. basement process structure; 2. foam concrete; 3. tubing; 4. roadbed; 5. road surface structare layer; 6. tubing axis.
Detailed description of the invention
In order to more specifically describe the utility model, below in conjunction with the drawings and the specific embodiments, the technical solution of the utility model is described in detail.
As depicted in figs. 1 and 2, the road structure of the utility model Freeway on Soft Ground road-bridge transition section, comprises soft foundation; Soft foundation is provided with roadbed 4, roadbed 4 is equipped with road surface structare layer 5; Some large diameter tubing 3 is embedded with side by side perpendicular to direction of traffic in the roadbed 4 of abutment; Tubing 3 fills in process at roadbed 4 and imbeds and fill soil or sand in tubing 3, after roadbed 4 has filled, the soil in tubing 3 or sand is transported, has changed and fill out foam concrete 2; Do the load being equivalent to reduce roadbed body like this, multi coil material and adjustment spacing can be set as required, realize loss of weight ratio in various degree.
In present embodiment, in soft foundation, corresponding tubing 3 position is provided with basement process structure 1, and coordinate basement process, the surcharge preloading during roadbed 4 fills, can effectively reduce relative settlement between road and bridge, prevents " bumping at bridge-head " phenomenon.
As shown in Figure 3, the work progress of present embodiment road structure is:
(1) complete cleaning and the finishing operations of foundation surface, carry out the construction of basement process subsequently;
(2) then start layered backfill, compaction in layers, until when filling out tubing axis 6, stop banketing, excavate the latter half tubing soil body according to the tubing position designed in advance;
(3) bury tubing underground, at the inner heap sand of tubing or soil, continue to banket in outside, and banketing near tubing adopts the compacting of Minitype manual compacting machine, prevents from destroying tubing;
(4) until when tubing top filled slope is greater than 0.5 ~ 1.0m, side allows mechanical ramming, and roadbed filling degree of compaction should meet code requirement;
(5), after roadbed filling completes, inner for the tubing soil body is transported, filled and process concrete;
(6) finally to construct paving.
As can be seen here, the utility model by burying tubing underground in subgrade construction process, and heap sand or soil wherein, after this body construction of roadbed completes, sand or soil transported, change and fill out foam concrete, serves surcharge preloading and reduce the effect of foundation settlement; Reduce roadbed deadweight, reduce roadbed cumulative settling, obviously reduce reinforced soft soil ground disposal cost, and shorten the duration.
Above-mentioned is can understand for ease of those skilled in the art and apply the utility model to the description of embodiment.Person skilled in the art obviously easily can make various amendment to above-described embodiment, and General Principle described herein is applied in other embodiments and need not through performing creative labour.Therefore, the utility model is not limited to above-described embodiment, and those skilled in the art are according to announcement of the present utility model, and the improvement made for the utility model and amendment all should within protection domains of the present utility model.
Claims (6)
1. a road structure for Freeway on Soft Ground road-bridge transition section, comprises soft foundation; Soft foundation is provided with roadbed, and roadbed is equipped with road surface structare layer; It is characterized in that: in the roadbed of abutment, be embedded with some tubing side by side perpendicular to direction of traffic, containing filler in described tubing.
2. road structure according to claim 1, is characterized in that: described tubing is imbedded and filled soil or sand in tubing in roadbed filling process; After roadbed filling completes, change in described tubing and fill out as foam concrete.
3. road structure according to claim 1, is characterized in that: in described soft foundation, corresponding tubing position is provided with basement process structure.
4. road structure according to claim 1, is characterized in that: when described tubing top filled slope is greater than 0.5 ~ 1.0m, and side allows mechanical ramming.
5. road structure according to claim 1, is characterized in that: after described roadbed filling completes, and is transported by inner for the tubing soil body, filled and process concrete.
6. road structure according to claim 1, is characterized in that: described roadbed filling process needs layered backfill, compaction in layers, until when filling out tubing axis, stops banketing, and excavates the latter half tubing soil body according to the tubing position designed in advance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520512565.8U CN204849508U (en) | 2015-07-15 | 2015-07-15 | Roadbed structure of soft soil foundation highway road bridge changeover portion |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520512565.8U CN204849508U (en) | 2015-07-15 | 2015-07-15 | Roadbed structure of soft soil foundation highway road bridge changeover portion |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106676994A (en) * | 2017-01-20 | 2017-05-17 | 浙江省交通规划设计研究院 | Foamed concrete embankment with adjustable load and construction method thereof |
| CN107447610A (en) * | 2017-06-11 | 2017-12-08 | 中铁二院工程集团有限责任公司 | A kind of high-speed railway transition segment structure and construction method |
| CN107700299A (en) * | 2017-10-12 | 2018-02-16 | 上海市政工程设计研究总院（集团）有限公司 | A kind of elevated bridge lower floor road structure and its construction method |
| CN111305095A (en) * | 2020-03-30 | 2020-06-19 | 中铁第五勘察设计院集团有限公司 | Pushing frame culvert for existing railway underpass |
| CN113073537A (en) * | 2021-04-25 | 2021-07-06 | 王拴保 | Bridge approach structure of highway engineering and construction method thereof |
| CN113136788A (en) * | 2021-04-14 | 2021-07-20 | 殷绍斌 | Bridgehead structure for reducing incidence of bridgehead vehicle bump and construction and maintenance method |
| CN114086472A (en) * | 2021-10-27 | 2022-02-25 | 中铁第四勘察设计院集团有限公司 | Construction method for controlling post-construction settlement of frame bridge |
-
2015
- 2015-07-15 CN CN201520512565.8U patent/CN204849508U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106676994A (en) * | 2017-01-20 | 2017-05-17 | 浙江省交通规划设计研究院 | Foamed concrete embankment with adjustable load and construction method thereof |
| CN107447610A (en) * | 2017-06-11 | 2017-12-08 | 中铁二院工程集团有限责任公司 | A kind of high-speed railway transition segment structure and construction method |
| CN107700299A (en) * | 2017-10-12 | 2018-02-16 | 上海市政工程设计研究总院（集团）有限公司 | A kind of elevated bridge lower floor road structure and its construction method |
| CN107700299B (en) * | 2017-10-12 | 2024-04-02 | 上海市政工程设计研究总院（集团）有限公司 | Overpass lower-layer ground road structure and construction method thereof |
| CN111305095A (en) * | 2020-03-30 | 2020-06-19 | 中铁第五勘察设计院集团有限公司 | Pushing frame culvert for existing railway underpass |
| CN113136788A (en) * | 2021-04-14 | 2021-07-20 | 殷绍斌 | Bridgehead structure for reducing incidence of bridgehead vehicle bump and construction and maintenance method |
| CN113136788B (en) * | 2021-04-14 | 2022-08-19 | 殷绍斌 | Bridgehead structure capable of reducing incidence of bridgehead bumping and construction and maintenance method |
| CN113073537A (en) * | 2021-04-25 | 2021-07-06 | 王拴保 | Bridge approach structure of highway engineering and construction method thereof |
| CN114086472A (en) * | 2021-10-27 | 2022-02-25 | 中铁第四勘察设计院集团有限公司 | Construction method for controlling post-construction settlement of frame bridge |
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Address after: No. 89 round City West Road, Xihu District, Hangzhou, Zhejiang Patentee after: Zhejiang transportation planning and Design Research Institute Co., Ltd. Address before: No. 89 round City West Road, Xihu District, Hangzhou, Zhejiang Patentee before: Zhejiang Provincial Plan Design&Research Institute of Communications |
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| CP03 | Change of name, title or address |
Address after: No. 928, yuhangtang Road, Xihu District, Hangzhou City, Zhejiang Province 310011 Patentee after: Zhejiang shuzhijiaoyuan Technology Co.,Ltd. Address before: 310006 No. 89 West Ring Road, Hangzhou, Zhejiang, Xihu District Patentee before: ZHEJIANG PROVINCIAL INSTITUTE OF COMMUNICATIONS PLANNING DESIGN & RESEARCH Co.,Ltd. |