CN201835198U

CN201835198U - Drainage roadbed for high underground water level

Info

Publication number: CN201835198U
Application number: CN2010205117894U
Authority: CN
Inventors: 刘建华; 李万百; 向祖全; 陈彩华; 陈海列; 刘长江; 袁裕银; 邓昕; 周勇; 杨玉深; 王亚鹏
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-08-25
Filing date: 2010-08-25
Publication date: 2011-05-18
Anticipated expiration: 2020-08-25

Abstract

The utility model relates to a drainage roadbed for a high underground water level, which adopts the methods of prevention, drainage and desludging and can effectively prevent disoperation of underground water on a roadbed. A permeable layer is arranged under a road structure, underground water is drained to blind channels at the two sides through the permeable layer, and a soft permeable pipe is arranged in the blind channels. Water is drained to a collector well through the blind channels and the soft permeable pipe and then is drained into a road rainwater system to be drained away through a drainage horizontal pipe.

Description

A kind of draining roadbed that is used for phreatic high

Technical field

The utility model relates to a kind of draining roadbed that is used for phreatic high, relates to urban road and highway, particularly roadbed.

Technical background

The roadbed of urban road and highway plays a part carrying, and requiring must be closely knit, even, stable, prevents the water intrusion roadbed." urban road design specifications " (CJJ37-90) requires: " when groundwater table is close to or higher than the road bottom land throughout the year, should adopt water proof measures such as separation layer, confining bed, to cut off phreatic supply "; " highway subgrade design specifications " (JTG D30-2004) requires: " when the influence on groundwater subgrade stability, should take to tackle ejectment underground water or fill the good measures such as material of seepage of water in the embankment bottom ".Comprehensive is exactly that the method for taking to prevent, arrange, dredge prevents the infringement of underground water to roadbed.

Solving main method at present is to increase embankment, ways such as gutter ejectment are set in the road both sides, but some area is subjected to condition restriction can't take said method to solve, the following bridge on highway of wearing is subjected to clearance limited can't increase embankment, especially urban road, grade elevation is subjected to the restriction of the urban planning control absolute altitude or the road absolute altitude that joins, and soil, road both sides utilizes problem that gutter etc. can not be set.If can not solve the subgrade drainage problem effectively, groundwater table rises or under the capillary water effect, the soil moisture content under the roadbed reaches capacity and becomes wet soft state, can't bear the road surface load and sedimentation, finally will cause the road surface to damage.

Summary of the invention

The purpose of this utility model is to solve groundwater level region, the problem of roadbed unstability under groundwater effect.The method that the utility model is taked to prevent, arranged, dredges can prevent the infringement of underground water to roadbed effectively.The infiltration french drain is located at the sidewalk outside, does not influence the setting of various pipelines under the sidewalk, and land used is general on the sidewalk outside makes a concession 5～10 meters and just can build permanent construction, is commonly used for to afforest or stop, and french drain is arranged on does not influence the land used function herein.

The utility model is realized by following technology:

Road structure layer on terrain vehicle trade 10 and sidewalk 11 is provided with roadbed pervious layer 15 2 times, the arranged outside french drain 3 on sidewalk 11.Underground water or capillary water rise, isolated by waterproofing geomembrane 14 on road structure layer 2 times, water by roadbed pervious layer 15 rows to both sides french drain 3, again by 4 rows of the flexible porous tubes in the french drain 3 to collecting well 5, enter rainwater inspection well 7 by dewatering horizontal tube 6.Draining roadbed plan view is seen Fig. 1.

Description of drawings

Fig. 1 is a kind of draining roadbed plan view that is used for phreatic high;

Fig. 2 is the I-I section road Cross Section figure of Fig. 1;

Fig. 3 is the II-II section road Cross Section figure of Fig. 1;

Fig. 4 is the A drawing of Fig. 2;

Fig. 5 is the III-III sectional drawing of Fig. 3.

Specific implementation method

Construction sequence is: the excavation roadbed, dig 30 centimetres down again according to road structure layer 2 bottom surface absolute altitude, and the roadbed horizontal wall inscription is with road axis 9 boundary aspect both sides, the gradient is consistent with road surface 10, locates to excavate french drain 3 for about 2 meters in 12 outsides, sideline, sidewalk, sees Fig. 2, the french drain size is seen Fig. 4, unit centimetre.The aspect of french drain should be consistent with the road aspect, and the gradient equals road grade but should not be less than 0.3%.French drain 3 is established collecting well 5 in the position of corresponding rainwater inspection well 7, and size is seen Fig. 5, unit centimetre.Adopt dewatering horizontal tube 6 to be connected between collecting well 5 and the rainwater inspection well 7, the gradient 0.5%～1% is advisable, and sees Fig. 3.Dewatering horizontal tube 6 adopts 200 millimeters draining double-wall corrugated pipes of φ.

Roadbed rolls shop, back plastics geo-grid 13, the plastics geo-grid adopts aperture 25.4 * 25.4 two-way geo-grid, the seam overlap joint is no less than 15 centimetres in length and breadth, plastics geo-grid 13 is spread to the edge of french drain 3, the roadbed pervious layer 15 of 30 cm thicks paves on plastics geo-grid 13, adopt the road roller grinding compacting, at roadbed pervious layer 15 upper berth one deck waterproofing geomembranes 14.Waterproofing geomembrane 16 is spread in the sidewall of french drain 3 and bottom surface, fills out the seepy material of 10 cm thicks in the french drain 3 earlier, lays 200 millimeters flexible porous tubes 4 of φ, fills up french drain pervious layer 17 in both sides and top, sees Fig. 4.Roadbed pervious layer 15 and french drain pervious layer 17 adopt sand gravel or rubble, and plastics geo-grid, waterproofing geomembrane, flexible porous tube are the finished product that market can be purchased.

Construction selects the dry season to carry out the worker as far as possible, otherwise should take the temporary drainage measure to reduce water level.After above-mentioned draining roadbed is finished, can be by normal operation builder's road structure and sidewalk, earthing grinding compacting on the french drain.

Claims

1. draining roadbed that is used for the high water level area, mainly comprise: pervious layer (1), french drain (3), flexible porous tube (4), collecting well (5), dewatering horizontal tube (6), underground water is by the french drain (3) of pervious layer (1) row to the road both sides, infiltrate flexible porous tube (4) row to collecting well (5), enter the road rain water system by dewatering horizontal tube (6) again.

2. a kind of draining roadbed that is used for the high water level area according to claim 1 is characterized in that: described pervious layer (1) is positioned at road structure layer (2) below.

3. a kind of draining roadbed that is used for the high water level area according to claim 1 is characterized in that: be plastics geo-grid (13) below the described pervious layer (1), above and be waterproofing geomembrane (14) between the road structure layer (2).

4. a kind of draining roadbed that is used for the high water level area according to claim 1 is characterized in that: described pervious layer (1) is demarcated to both sides aspect french drains (3) with road axis (9).

5. a kind of draining roadbed that is used for the high water level area according to claim 1 is characterized in that: fill seepy material (15) in the described pervious layer (1), described french drain (3) fills seepy material (17).

6. a kind of draining roadbed that is used for the high water level area according to claim 1 is characterized in that: the position in corresponding rainwater inspection well (7), the french drain of road both sides (3) is provided with collecting well (5).

7. a kind of draining roadbed that is used for the high water level area according to claim 1 is characterized in that: collecting well (5) adopts dewatering horizontal tube (6) to be communicated with rainwater inspection well (7).