CN104594331A - Method for reinforcing road high-stacked culvert foundation - Google Patents
Method for reinforcing road high-stacked culvert foundation Download PDFInfo
- Publication number
- CN104594331A CN104594331A CN201510049597.3A CN201510049597A CN104594331A CN 104594331 A CN104594331 A CN 104594331A CN 201510049597 A CN201510049597 A CN 201510049597A CN 104594331 A CN104594331 A CN 104594331A
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- China
- Prior art keywords
- foundation
- culvert
- reinforcement means
- reinforcing
- high roadbed
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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
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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
- E02D3/12—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
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a method for reinforcing a road high-stacked culvert foundation. The method comprises the following steps: (1) excavating refilling grooves through an excavator along a direction parallel to the axial direction of a culvert; (2) refilling broken stones into the refilling grooves, and grouting cement paste into broken stone gaps, wherein the grouted cement paste and the broken stones are constructed into a reinforcing area for carrying upper load together with foundation soil; (3) checking the reinforcing effect by adopting a static load test after 6-9 days of the completion of grouting, and performing upper structure construction and roadbed filling after the design requirement is met by the carrying force. According to the method, the grooves are excavated with the excavator along the axial direction of the culvert, the reinforcing area is constructed by refilling the broken stones and grouting the cement paste, and the reinforcing area and foundation soil on both sides carry upper load together, thereby forming a novel bilaterally-reinforced composite foundation. The rigidity of the foundation is adjusted by adjusting the depths of the formed grooves and the distances among the formed grooves. Compared with the prior art, the method for reinforcing the road high-stacked culvert foundation is low in cost, is easy to operate, is wide in adaptability, and is easy for ensuring the quality.
Description
Technical field
The present invention relates to technical field of building construction, specifically a kind of highway high roadbed culvert foundation reinforcement means.
Background technology
Highway high roadbed culvert covers the depth of fill usually more than 10 m, what have even can more than 50 m.Because filled load is large, the ground of culvert bears larger vertical load, and culvert foundation exists stress and concentrates and the problem such as excessive deformation, easily causes the disease of the differential settlement of culvert and excessive sedimentation etc.These diseases gently then cause that culvert ftractures, seepage or ponding, heavy then cause culvert structure to destroy, and even occur collapsing, have a strong impact on the normal use of culvert and highway.
At present, mainly to change, Sand-gravel-cushion Technioue is filled out to the ground stabilization measure of highway high roadbed culvert.Change fill out Sand-gravel-cushion Technioue be bearing stratum under building basis weaker, when can not meet the requirement of superstructure load to ground, soft layer in certain limit under basis is cut out, then backfill larger sand, sandstone or the dirt etc. of intensity and compacting as the method for the bearing stratum of ground.Although changing and filling out Sand-gravel-cushion Technioue to be to a certain degree play the effect improving foundation capability and reduce ground decrement, but still there is the following aspects deficiency in it: (1) is changed and filled out Sand-gravel-cushion Technioue treating depth and be generally no more than 3m, is unsuitable for the process of darker soft foundation; (2) change the degree of compaction of filling out Sand-gravel-cushion Technioue sandstone filler not easily to ensure; (3) large area changes back-up sand hardcore long construction period, and cost is high, large to environmental disruption.
Summary of the invention
The object of the invention is to propose in order to avoid above-mentioned the deficiencies in the prior art a kind of low cost, high-reliability, be easy to adjust control, wide adaptability, highway high roadbed culvert foundation reinforcement means that Technical Economy is good.
A kind of highway high roadbed of the present invention culvert foundation reinforcement means, the high roadbed culvert foundation being applicable to Lack of support is reinforced, and comprises the following steps:
(1) be parallel to culvert axis direction digging up and filling in groove by excavator edge;
(2) in backfill groove, backfill rubble, and at rubble space grout injection, slip casting and rubble form stabilization zone jointly, be used from bear upper load with foundation soil one;
(3), after perfusion completes 6-9 days, adopt static load test inspection consolidation effect, after power to be lifted meets design requirement, carry out top structure construction and embankment.
Described backfill groove excavation width equals 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, carries out calculating and determining according to the method calculating area replacement ratio in theory of composite foundation.
The diameter of described rubble is 20-50mm, and mud content is less than 10%.
Described cement paste is plain-water slurry, and water/binder ratio is 0.4-0.45.
The invention has the beneficial effects as follows: the present invention adopts excavator along culvert axis direction milling slot, and backfill rubble grout injection formation stabilization zone, stabilization zone and both sides foundation soil shared upper load, form a kind of novel two-way enhancement type composite foundation.By being adjusted to spacing adjustment foundation stiffness between groove depth and groove, the high roadbed culvert foundation reinforcement means that comparing with existing similar techniques is a kind of low cost, easy to operate, applicability is wide, quality easily ensures.
Accompanying drawing explanation
Fig. 1 is the culvert structure schematic diagram after adopting the inventive method.
Mark in figure: 1-culvert, 2-ground, 3-backfills groove, 4-rubble, 5-cement paste, 6-stabilization zone.
Detailed description of the invention
Highway high roadbed culvert foundation reinforcement means of the present invention, the ground stabilization of high roadbed culvert 1 when being applicable to Lack of support, the method first by excavator on ground 2 along culvert axis direction digging up and filling in groove 3, backfill rubble 4 in backfill groove 3 after, grout injection 5 forms stabilization zone 6, make foundation soil 2 form a kind of novel composite foundation together with stabilization zone 6, reach the object of strengthening soft foundation.By being adjusted between groove depth and groove spacing adjustment foundation stiffness, being a kind of low cost, high-reliability, being easy to adjust control, wide adaptability, foundation reinforcement method that Technical Economy is good.
Specifically comprise the steps:
A: according to high roadbed culvert foundation requirement for bearing capacity, tentatively determine the degree of depth and the spacing of required digging up and filling in groove according to the method calculating area replacement ratio in theory of composite foundation, backfill Cao Zhong grouting and reinforcing district modulus is determined by laboratory test.
B: in ground, calculates the cutting depth and spacing determined according to previous step, adopt 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 in backfill groove, simultaneously grout injection stirring, make rubble homogeneous condensation form stabilization zone.To be onstructed complete 7 days after, adopt static load test inspection consolidation effect, checking bearing capacity of foundation soil whether meet the demands.
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.On-the-spot test below ground 3.6m place bearing capacity of foundation soil 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 mixing ballast grain sizes is 3-5cm, and the water/binder ratio of grout injection is 0.42.
During construction, adopt 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 adopt No. 325 Portland cement configuration cement pastes, the water/binder ratio of cement paste is 0.42, by the gap formation stabilization zone of grout pouring between rubble, carry out field static load test after slip casting completes 7 days and determine reached bearing capacity.After bearing capacity meets design requirement, carry out top structure construction and embankment.
Embodiment 2
Certain speedway 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 mixing ballast grain sizes is 4-5cm, and the water/binder ratio of grout injection is 0.42.
During construction, adopt 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 adopt No. 325 Portland cement configuration cement pastes, the water/binder ratio of cement paste is 0.42, by the gap formation stabilization zone of grout pouring between rubble, carry out after slip casting completes 7 days after field static load test determination bearing capacity meets design requirement, carrying out top structure construction and embankment.
Above-mentioned detailed description of the invention is the preferred embodiment of the present invention; be not for limiting enforcement of the present invention and right; all equivalences made according to the content described in the present patent application scope of patent protection change and modify, and all should be included within the scope of this real patent application.
Claims (6)
1. a highway high roadbed culvert foundation reinforcement means, is characterized in that comprising the following steps:
(1) be parallel to culvert axis direction digging up and filling in groove by excavator edge;
(2) in backfill groove, backfill rubble, and at rubble space grout injection, slip casting and rubble form stabilization zone jointly, be used from bear upper load with foundation soil one;
(3), after perfusion completes 6-9 days, adopt static load test inspection consolidation effect, after power to be lifted meets design requirement, carry out top structure construction and embankment.
2. highway high roadbed culvert foundation reinforcement means as claimed in claim 1, is characterized in that: described backfill groove excavation width equals the grab bucket width of excavator.
3. highway high roadbed culvert foundation reinforcement means as claimed in claim 1, is characterized 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, is characterized in that: the spacing between described backfill groove, carries out calculating and determining according to the method calculating area replacement ratio in theory of composite foundation.
5. highway high roadbed culvert foundation reinforcement means as claimed in claim 1, is characterized in that: the diameter of described rubble is 20-50mm, and mud content is less than 10%.
6. highway high roadbed culvert foundation reinforcement means as claimed in claim 1, it is characterized in that: described cement paste is plain-water slurry, water/binder ratio 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 |
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| 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 true CN104594331A (en) | 2015-05-06 |
| CN104594331B CN104594331B (en) | 2016-08-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106836034A (en) * | 2017-03-09 | 2017-06-13 | 山西省交通科学研究院 | A kind of high roadbed slab culvert flexibility off-load system and construction method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1088562A (en) * | 1996-09-10 | 1998-04-07 | Maeda Kousen Kk | Soil improvement method and soil improvement unit |
| JP2008019562A (en) * | 2006-07-11 | 2008-01-31 | Port & Airport Research Institute | Construction method of countermeasure against liquefaction under breakwater |
| CN103469781A (en) * | 2013-10-17 | 2013-12-25 | 中国建筑东北设计研究院有限公司 | Complete applying method of wall-column-combined ground treatment in coastal soft soil area |
-
2015
- 2015-01-30 CN CN201510049597.3A patent/CN104594331B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1088562A (en) * | 1996-09-10 | 1998-04-07 | Maeda Kousen Kk | Soil improvement method and soil improvement unit |
| JP2008019562A (en) * | 2006-07-11 | 2008-01-31 | Port & Airport Research Institute | Construction method of countermeasure against liquefaction under breakwater |
| CN103469781A (en) * | 2013-10-17 | 2013-12-25 | 中国建筑东北设计研究院有限公司 | Complete applying method of wall-column-combined ground treatment in coastal soft soil area |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106836034A (en) * | 2017-03-09 | 2017-06-13 | 山西省交通科学研究院 | A kind of high roadbed slab culvert flexibility off-load system and construction method |
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| Publication number | Publication date |
|---|---|
| CN104594331B (en) | 2016-08-17 |
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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 |
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