CN104594331B - A kind of method that highway high roadbed culvert foundation is reinforced - Google Patents
A kind of method that highway high roadbed culvert foundation is reinforced Download PDFInfo
- Publication number
- CN104594331B CN104594331B CN201510049597.3A CN201510049597A CN104594331B CN 104594331 B CN104594331 B CN 104594331B CN 201510049597 A CN201510049597 A CN 201510049597A CN 104594331 B CN104594331 B CN 104594331B
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- CN
- China
- Prior art keywords
- foundation
- rubble
- groove
- culvert
- high roadbed
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/0023—Slurry
Abstract
A kind of highway high roadbed culvert foundation reinforcement means, comprises the following steps: (1) by excavator along being parallel to culvert axis direction digging up and filling in groove；(2) in backfill groove, backfill rubble, and at rubble space grout injection, slip casting and rubble collectively form stabilization zone, are used for undertaking upper load together with foundation soil；(3), after perfusion completes 69 days, use static load test inspection consolidation effect, after power to be lifted meets design requirement, carry out top structures construction and embankment.The present invention uses excavator along culvert axis direction milling slot, and backfills rubble grout injection and forms stabilization zone, stabilization zone and both sides foundation soil shared upper load, forms a kind of novel two-way enhancement type composite foundation.Adjusting foundation stiffness by being adjusted between groove depth and groove spacing, comparing compared with similar techniques is the high roadbed culvert foundation reinforcement means that a kind of low cost, easily operation, applicability be wide, quality is easily guaranteed that.
Description
Technical field
The present invention relates to technical field of building construction, a kind of highway high roadbed culvert foundation reinforcement means.
Background technology
The highway high roadbed culvert overlying depth of fill is usually more than 10 m, and have even can be more than 50 m.Owing to filled load is big, the ground of culvert bears bigger vertical load, and culvert foundation exists stress collection and neutralizes the problems such as excessive deformation, easily causes the disease of the differential settlement of culvert and excessive sedimentation etc..These diseases the most then cause culvert cracking, seepage or ponding, heavy then cause culvert structure to destroy, even occur collapsing, and have a strong impact on normally using of culvert and highway.
At present, the foundation stabilization measure to highway high roadbed culvert mainly fills out Sand-gravel-cushion Technioue to change.Change and fill out Sand-gravel-cushion Technioue and be that the supporting course under buildings or structures basis is weaker, when can not meet superstructure load to the requirement of ground, soft layer a range of under basis is cut out, then backfills intensity bigger sand, sandstone or dirt etc. the method being compacted the supporting course as ground.Although changing and filling out Sand-gravel-cushion Technioue to be to a certain degree to play improve foundation capability and reduce the effect of ground decrement, but it is not enough that it still suffers from the following aspects: (1) is changed and filled out Sand-gravel-cushion Technioue and process the degree of depth and be usually no more than 3m, is unsuitable for the process of deeper soft foundation；(2) change and fill out the compactness of Sand-gravel-cushion Technioue sandstone filler and be difficult to ensure；(3) large area changes back-up sand hardcore long construction period, and cost is high, big to environmental disruption.
Summary of the invention
It is an object of the invention to propose in order to avoid above-mentioned the deficiencies in the prior art a kind of low cost, high-reliability, be prone to adjust control, wide adaptability, highway high roadbed culvert foundation reinforcement means that Technical Economy is good.
One highway high roadbed culvert foundation reinforcement means of the present invention, it is adaptable to the high roadbed culvert foundation of Lack of support is reinforced, and comprises the following steps:
(1) by excavator along being parallel to culvert axis direction digging up and filling in groove；
(2) in backfill groove, backfill rubble, and at rubble space grout injection, slip casting and rubble collectively form stabilization zone, are used for undertaking upper load together with foundation soil；
(3), after perfusion completes 6-9 days, use static load test inspection consolidation effect, after power to be lifted meets design requirement, carry out top structures construction and embankment.
Described backfill groove excavation width is equal to the grab bucket width of excavator.
Described backfill groove cutting depth is determined by load test according to ground requirement for bearing capacity.
Spacing between described backfill groove, calculates according to the method calculating area replacement ratio in theory of composite foundation and determines.
A diameter of 20-50mm of described rubble, clay content is less than 10%.
Described cement mortar is plain-water slurry, and the ratio of mud is 0.4-0.45.
The invention has the beneficial effects as follows: the present invention uses excavator along culvert axis direction milling slot, and backfills rubble grout injection and forms stabilization zone, stabilization zone and both sides foundation soil shared upper load, forms a kind of novel two-way enhancement type composite foundation.Adjusting foundation stiffness by being adjusted between groove depth and groove spacing, comparing compared with similar techniques is the high roadbed culvert foundation reinforcement means that a kind of low cost, easily operation, applicability be wide, quality is easily guaranteed that.
Accompanying drawing explanation
Fig. 1 is the culvert structure schematic diagram after using the inventive method.
Figure marks: 1-culvert, 2-ground, 3-backfills groove, 4-rubble, 5-cement mortar, 6-stabilization zone.
Detailed description of the invention
The highway high roadbed culvert foundation reinforcement means of the present invention, it is applicable to the foundation stabilization of high roadbed culvert 1 during Lack of support, the method first passes through excavator on ground 2 along culvert axis direction digging up and filling in groove 3, after backfilling rubble 4 in backfill groove 3, grout injection 5 constitutes stabilization zone 6, make foundation soil 2 constitute a kind of novel composite foundation together with stabilization zone 6, reach the purpose of strengthening soft foundation.Adjust foundation stiffness by being adjusted between groove depth and groove spacing, be a kind of low cost, high-reliability, be prone to adjust control, wide adaptability, foundation reinforcement method that Technical Economy is good.
Specifically include following steps:
A: according to high roadbed culvert foundation requirement for bearing capacity, primarily determines that according to the method calculating area replacement ratio in theory of composite foundation the degree of depth and the spacing of required digging up and filling in groove, backfill Cao Zhong grouting and reinforcing district modulus are determined by laboratory test.
B: in ground, calculates the cutting depth and spacing determined according to previous step, uses excavator along culvert axis direction digging up and filling in groove, and backfill well width is equal in excavator grab bucket.
C: backfill crushed rock filler, simultaneously grout injection being stirred in backfill groove, makes rubble homogeneous condensation form stabilization zone.To be onstructed complete 7 days after, use static load test inspection consolidation effect, checking foundation bearing capacity whether meet requirement.
Below in conjunction with specific embodiment, wood invention is described in further detail:
Embodiment 1
Certain mountainous area highway high roadbed culvert foundation is: 0-0.8m is miscellaneous fill, and 0.8-3.4m is silty clay: yellowish-brown；3.4-5.8m cohesive soil, yellow, taupe gray, plastic～hard plastic.At on-the-spot test below ground 3.6m, foundation bearing capacity is 240kPa, and high roadbed culvert foundation design ultimate bearing capacity is 320kPa, and bearing capacity can not meet design requirement.
Engineered fill groove cutting depth is 4.0m, and area replacement ratio is 40%, and incorporation ballast grain sizes is 3-5cm, and the ratio of mud of grout injection is 0.42.
During construction, use the grooving on ground of hydraulic crawler backacter, become groove depth to be about 3.5m, after grooving completes, carry out the artificial clear end, after the clear end, completes, the rubble of backfill diameter 3-5cm, and use No. 325 Portland cement configuration cement mortars, the ratio of mud of cement mortar is 0.42, by grout pouring formation stabilization zone, gap between rubble, slip casting carries out field static load test after completing 7 days and determines reached bearing capacity.After bearing capacity meets design requirement, carry out top structures construction and embankment.
Embodiment 2
Certain highway high roadbed culvert foundation is: 0-3m silty clay: grey, taupe gray, viscosity is strong；3-7m cohesive soil, yellow, taupe gray, hard plastic.
Engineered fill groove cutting depth is 3.5m, and area replacement ratio is 50%, and incorporation ballast grain sizes is 4-5cm, and the ratio of mud of grout injection is 0.42.
During construction, use the grooving on ground of hydraulic crawler backacter, become groove depth to be about 3.5m, after grooving completes, carry out the artificial clear end, after the clear end, completes, the rubble of backfill diameter 4-5cm, and use No. 325 Portland cement configuration cement mortars, the ratio of mud of cement mortar is 0.42, by grout pouring formation stabilization zone, gap between rubble, slip casting carry out after completing 7 days field static load test determine bearing capacity meet design require after, carry out top structures construction and embankment.
Above-mentioned detailed description of the invention is the preferred embodiment of the present invention; it is not for limiting the enforcement of the present invention and right; all equivalence changes made according to the content described in the present patent application scope of patent protection and modification, in the range of all should being included in this reality patent application.
Claims (5)
1. a highway high roadbed culvert foundation reinforcement means, it is characterised in that comprise the following steps:
(1) by excavator along being parallel to culvert axis direction digging up and filling in groove；Between between described backfill groove
Away from, calculate according to the method calculating area replacement ratio in theory of composite foundation and determine；
(2) in backfill groove, backfill rubble, and at rubble space grout injection, slip casting and the common structure of rubble
Become stabilization zone, be used for undertaking upper load together with foundation soil；
(3) after perfusion completes 6-9 days, using static load test inspection consolidation effect, power to be lifted meets
After design requires, carry out top structures construction and embankment.
2. highway high roadbed culvert foundation reinforcement means as claimed in claim 1, it is characterised in that:
Described backfill groove excavation width is equal to the grab bucket width of excavator.
3. highway high roadbed culvert foundation reinforcement means as claimed in claim 1, it is characterised in that:
Described backfill groove cutting depth is determined by load test according to ground requirement for bearing capacity.
4. highway high roadbed culvert foundation reinforcement means as claimed in claim 1, it is characterised in that:
A diameter of 20-50mm of described rubble, clay content is less than 10%.
5. highway high roadbed culvert foundation reinforcement means as claimed in claim 1, it is characterised in that:
Described cement mortar is plain-water slurry, and the ratio of mud is 0.4-0.45.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510049597.3A CN104594331B (en) | 2015-01-30 | 2015-01-30 | A kind of method that highway high roadbed culvert foundation is reinforced |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510049597.3A CN104594331B (en) | 2015-01-30 | 2015-01-30 | A kind of method that highway high roadbed culvert foundation is reinforced |
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| CN104594331A CN104594331A (en) | 2015-05-06 |
| CN104594331B true CN104594331B (en) | 2016-08-17 |
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| CN106703836A (en) * | 2016-12-29 | 2017-05-24 | 中铁隧道勘测设计院有限公司 | Treatment method of the bedding soft soil of existing circular shield tunnel |
| CN106836034B (en) * | 2017-03-09 | 2023-04-28 | 山西省交通科学研究院 | High-fill cover plate culvert flexible load shedding system and construction method |
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| JP3749995B2 (en) * | 1996-09-10 | 2006-03-01 | 前田工繊株式会社 | Ground improvement method and ground improvement body |
| JP4982632B2 (en) * | 2006-07-11 | 2012-07-25 | 独立行政法人港湾空港技術研究所 | Liquefaction countermeasure method under breakwater |
| CN103469781B (en) * | 2013-10-17 | 2016-06-08 | 中国建筑东北设计研究院有限公司 | Wall column in conjunction with basement process at the complete application process in coastal soft clay area |
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Inventor after: Ma Qiang Inventor after: Zhang Ke Inventor after: Xiao Henglin Inventor after: Li Lihua Inventor after: Liu Yongli Inventor after: Shi Hongcai Inventor after: Zhu Jian Inventor after: Xing Wenwen Inventor after: Hu Xing Inventor before: Ma Qiang Inventor before: Xiao Henglin Inventor before: Li Lihua Inventor before: Liu Yongli Inventor before: Shi Hongcai Inventor before: Zhu Jian Inventor before: Xing Wenwen Inventor before: Hu Xing |