CN110528545B - Construction method of foundation deep-buried drainage blind ditch - Google Patents
Construction method of foundation deep-buried drainage blind ditch Download PDFInfo
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- CN110528545B CN110528545B CN201810510755.4A CN201810510755A CN110528545B CN 110528545 B CN110528545 B CN 110528545B CN 201810510755 A CN201810510755 A CN 201810510755A CN 110528545 B CN110528545 B CN 110528545B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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Abstract
A construction method of a foundation deep-buried drainage blind ditch is used for effectively improving the construction safety of the deep-buried drainage blind ditch with a small cross section, ensuring the construction quality and the drainage performance and saving the engineering cost. The method is mainly characterized in that a blind ditch excavation area is marked in a partitioning mode and divided into a full-section excavation area and a local excavation area which are separated from each other along the length direction of the blind ditch excavation area, a full-section excavation area blind ditch foundation pit is constructed in a layered excavation mode firstly, hollow permeable anchor rods are adopted for supporting the foundation pit on two sides in a layered mode, and then the bottom of the foundation pit excavated in the full-section excavation area is excavated to the two sides of the blind ditch undermining excavation area.
Description
Technical Field
The invention relates to geotechnical engineering, in particular to a construction method of a foundation deep-buried drainage blind ditch.
Background
The drainage blind ditch is widely applied to the expansive rock soil foundation of the high-speed railway and the foundation with a higher underground water level, the underground water level can be effectively reduced by arranging the drainage blind ditch, the influence of the underground water on the roadbed structure of the high-speed railway is reduced, and the expansion rock soil is prevented from causing overlarge upwarp deformation of the high-speed railway under the action of water and being difficult to repair. In order to reduce the influence of underground water level on a roadbed structure under many conditions, particularly to construct a ballastless track high-speed railway in an expansive rock-soil area, the depth of the arranged drainage blind ditch is large, sometimes reaches 4-5m, but the cross section of the drainage blind ditch is usually about 1m, so that how to realize the rapid and safe construction of the drainage blind ditch with a deep-buried small cross section and ensure the construction quality are problems which need to be solved urgently.
Disclosure of Invention
The invention aims to solve the technical problem of providing a construction method of a foundation deep-buried drainage blind ditch, so as to effectively improve the construction safety of the deep-buried drainage blind ditch with small cross section, ensure the construction quality and the drainage performance and save the labor cost.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention relates to a construction method of a foundation deep-buried drainage blind ditch, which comprises the following steps:
firstly, displaying a set boundary line of a drainage blind ditch on a ground mark line at the position of the drainage blind ditch;
secondly, marking the blind ditch excavation area in a partitioning manner, and dividing the blind ditch excavation area into a full-section excavation area and a local excavation area which are spaced along the length direction of the blind ditch excavation area;
thirdly, carrying out layered excavation construction on the blind ditch foundation pit in the full-section excavation area, and carrying out foundation pit supporting by adopting hollow permeable anchor rods on two sides in layers until the bottom of the foundation pit;
fourthly, performing blind trench cut excavation on the bottom of the local excavation region to two sides at the bottom of the foundation pit excavated in the full-section excavation region;
constructing a blind ditch waterproof foundation at the bottoms of the full-section excavation area and the local excavation area;
placing a drainage pipe with an opening in the waterproof foundation, filling the fixed drainage pipe with the cleaned crushed stone, and filling the cleaning crushed stone in the excavation groove of the local excavation area;
seventhly, placing bagged medium coarse sand wrapped by water-permeable geotextile bags on two sides of the foundation pit in layers at the top of the waterproof foundation of the full-section excavation area, and filling and cleaning broken stones in the middle until the top surface of the construction is high;
constructing a concrete sealing layer on the top of the blind ditch of the full-section excavation area.
The invention has the advantages that the excavation range of the foundation pit is reduced by arranging the full-section excavation area and the local excavation area, the excavation construction safety of the foundation pit is improved, and the engineering investment is saved; the blind ditches are arranged at intervals of full depth and local depth, so that the effect of reducing the underground water level can be achieved, and meanwhile, the full depth and local depth of the blind ditches can be arranged at intervals of full depth and local depth so as to prevent the underground water of the upper foundation from moving to the inner rock-soil body; the two sides of the foundation pit of the full-section excavation area are supported by the hollow permeable anchor rods, so that the safety of the foundation pit support can be ensured, the drainage effect can be realized, and the problem that the drainage channel needs to be drilled again for drainage because the traditional support structure seals the drainage channel is solved; the construction method has the characteristics of simple construction, good economy, good precipitation effect, environmental protection and the like, and has popularization and application values.
Drawings
The specification includes the following three drawings:
FIG. 1 is a plan sectional view of a construction method of a deep-buried drainage blind ditch for a foundation according to the present invention.
FIG. 2 is a schematic sectional view A-A of a method for constructing a deep foundation drainage blind ditch according to the present invention.
FIG. 3 is a schematic cross-sectional view B-B of the construction method of the foundation deep-buried drain blind ditch of the present invention.
The component names and corresponding labels are shown in the figure: the water-proof foundation comprises a water-proof foundation 1, a water drainage pipe 2, bagged medium coarse sand 3, cleaned broken stone 4, a sealing layer 5, a foundation rock-soil body 6, a hollow permeable anchor rod 7, a full-section excavation area I and a local excavation area II.
Detailed Description
The invention is further described below with reference to the accompanying drawings and examples.
Referring to fig. 1 to 3, a construction method of a foundation deep-buried drainage blind ditch comprises the following steps:
firstly, displaying a set boundary line of a drainage blind ditch on a ground mark line at the position of the drainage blind ditch;
secondly, marking the blind ditch excavation area in a partitioning manner, and dividing the blind ditch excavation area into a full-section excavation area I and a local excavation area II which are spaced along the length direction of the blind ditch excavation area;
thirdly, carrying out layered excavation construction on the blind ditch foundation pit in the full-section excavation area I, and carrying out foundation pit supporting on two sides by layers by adopting hollow permeable anchor rods 7 until the bottom of the foundation pit;
fourthly, performing blind ditch undermining excavation on the bottom of the local excavation region II from the bottom of the foundation pit excavated in the full-section excavation region I to two sides;
constructing a blind ditch waterproof foundation 1 at the bottoms of the full-section excavation area I and the local excavation area II;
placing the drainage pipe 2 with the opening in the waterproof foundation 1, filling the fixed drainage pipe with the cleaned crushed stone 4, and filling the cleaned crushed stone 4 in the excavation groove of the local excavation area II;
seventhly, placing bagged medium coarse sand 3 wrapped by permeable geotextile bags on two sides of the foundation pit in layers at the top of the waterproof foundation 1 of the full-section excavation area I, and filling and cleaning broken stones 4 in the middle until the top surface of the construction is high;
constructing a concrete sealing layer 5 on the top of the blind ditch of the full-section excavation area I.
In the fourth step, the excavation height of blind ditches at the bottom of the local excavation area II is generally not less than 0.5 m. The cross section of the waterproof foundation 1 is U-shaped.
Referring to fig. 1, the length direction of the blind ditch excavation area is divided into a full-section excavation area I and a local excavation area II which are separated from each other, so that the excavation range of the foundation pit is reduced, the construction safety of the foundation pit excavation is improved, and the engineering investment is saved. Referring to fig. 2 and 3, the blind ditches are arranged at intervals of full depth and local depth, so that the effect of reducing the underground water level can be achieved, and meanwhile, the movement of the ground rock-soil groundwater of the upper part of the foundation to the inner rock-soil body can be prevented due to the fact that the water permeability of the ground rock-soil body and the material of the full-depth blind ditches is obviously different. Excavation foundation ditch adopts cavity stock 7 that permeates water to strut, both can guarantee the safety of excavation supporting, can play the drainage effect again, has avoided traditional supporting construction to seal the problem that drainage channel need drill hole drainage again.
The construction method has the characteristics of simple construction, good economical efficiency, good precipitation effect, environmental protection and the like, and has popularization and application values.
The foregoing is only illustrative of the principles and operational steps of the method for constructing a blind drain for deep foundation burial, and is not intended to limit the invention to the specific constructions and steps shown and described, and accordingly all modifications and equivalents that may be employed fall within the scope of the claims.
Claims (3)
1. A construction method of a foundation deep-buried drainage blind ditch comprises the following steps:
firstly, displaying a set boundary line of a drainage blind ditch on a ground mark line at the position of the drainage blind ditch;
secondly, marking the blind ditch excavation area in sections, and dividing the blind ditch excavation area into a full-section excavation area (I) and a local excavation area (II) which are spaced along the length direction of the blind ditch excavation area;
thirdly, carrying out layered excavation construction on a blind ditch foundation pit in the full-section excavation area (I), and carrying out foundation pit support by using hollow permeable anchor rods (7) in layers until the bottom of the foundation pit is reached;
fourthly, performing blind trench cut excavation on the bottom of the local excavation region (II) from the bottom of the foundation pit excavated in the full-section excavation region (I) to two sides;
constructing blind ditch waterproof foundations (1) at the bottoms of the full-section excavation area (I) and the local excavation area (II);
placing a drain pipe (2) in the waterproof foundation (1), filling the fixed drain pipe with cleaned crushed stone (4), and filling the cleaned crushed stone (4) in an excavation groove of the local excavation area (II);
seventhly, placing bagged medium coarse sand (3) wrapped by permeable geotextile bags on two sides of the foundation pit in layers at the top of the waterproof foundation (1) of the full-section excavation area (I), and filling and cleaning broken stones (4) in the middle until the top surface elevation is constructed;
constructing a concrete sealing layer (5) on the top of the blind ditch of the full-section excavation area (I).
2. The construction method of the foundation deep-buried drain blind ditch according to claim 1, characterized in that: in the fourth step, the excavation height of blind ditches at the bottom of the local excavation area (II) is not less than 0.5 m.
3. The construction method of the foundation deep-buried drain blind ditch according to claim 1, characterized in that: the cross section of the waterproof foundation (1) is U-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810510755.4A CN110528545B (en) | 2018-05-24 | 2018-05-24 | Construction method of foundation deep-buried drainage blind ditch |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810510755.4A CN110528545B (en) | 2018-05-24 | 2018-05-24 | Construction method of foundation deep-buried drainage blind ditch |
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| Publication Number | Publication Date |
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| CN110528545A CN110528545A (en) | 2019-12-03 |
| CN110528545B true CN110528545B (en) | 2021-03-26 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104314090A (en) * | 2014-08-29 | 2015-01-28 | 中铁八局集团建筑工程有限公司 | Deep foundation pit bedrock drainage culvert and drainage system and drainage construction method thereof |
| KR20150065475A (en) * | 2013-12-05 | 2015-06-15 | 한국도로공사 | Side gutter for mountain ridge and construction method |
| CN107201908A (en) * | 2017-06-16 | 2017-09-26 | 中铁五局集团有限公司 | A kind of construction method of the regional buried Central drain in tunnel of bitter cold |
| CN107780425A (en) * | 2017-09-20 | 2018-03-09 | 太原理工大学 | A kind of large-scale yard drain french drain method to set up of banketing in Gullied Rolling Loess Region |
-
2018
- 2018-05-24 CN CN201810510755.4A patent/CN110528545B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150065475A (en) * | 2013-12-05 | 2015-06-15 | 한국도로공사 | Side gutter for mountain ridge and construction method |
| CN104314090A (en) * | 2014-08-29 | 2015-01-28 | 中铁八局集团建筑工程有限公司 | Deep foundation pit bedrock drainage culvert and drainage system and drainage construction method thereof |
| CN107201908A (en) * | 2017-06-16 | 2017-09-26 | 中铁五局集团有限公司 | A kind of construction method of the regional buried Central drain in tunnel of bitter cold |
| CN107780425A (en) * | 2017-09-20 | 2018-03-09 | 太原理工大学 | A kind of large-scale yard drain french drain method to set up of banketing in Gullied Rolling Loess Region |
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| CN110528545A (en) | 2019-12-03 |
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