CN102635104A - Wedge-shaped Geocell cement reinforced soil structure for road-bridge connection and construction method thereof - Google Patents

Wedge-shaped Geocell cement reinforced soil structure for road-bridge connection and construction method thereof Download PDF

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Publication number
CN102635104A
CN102635104A CN2012101045405A CN201210104540A CN102635104A CN 102635104 A CN102635104 A CN 102635104A CN 2012101045405 A CN2012101045405 A CN 2012101045405A CN 201210104540 A CN201210104540 A CN 201210104540A CN 102635104 A CN102635104 A CN 102635104A
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China
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geotechnical grid
stabilized soil
cement
cement stabilized
layer
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CN2012101045405A
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Chinese (zh)
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汪益敏
陈页开
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South China University of Technology SCUT
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South China University of Technology SCUT
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Priority to CN2012101045405A priority Critical patent/CN102635104A/en
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Abstract

The invention relates to a wedge-shaped Geocell cement reinforced soil structure for road-bridge connection and a construction method thereof. The structure comprises cement stabilized soil (4), fillers and Geocells (3), wherein one ends of the Geocells (3) are fixed a bridge arch table back (2), the other ends of the Geocells (3) are fixed on a roadbed (5), the Geocells (3) are arranged in multi-layer way from top to bottom, the fillers and the cement stabilized soil (4) are filled between two adjacent layers of Geocells (3), the cement stabilized soil (4) is filled at one ends, closed to the bridge arch table back (2), of the Geocells (3), the length of the cement stabilized soil at the top layer is (1/2)-(3/4) of that of the Geocell at the top layer, the other parts of the Geocells (3) are filled with the fillers, and the lengths of the cement stabilized soil (4) and the Geocells (3) are gradually reduced in a layer-by-layer way so as to form a wedge shape or a frustum. The wedge-shaped Geocell cement reinforced soil structure and the method can effectively reduce a problem of bumping at a bridge-head, improve comfort and safety of traveling, simultaneously and extremely reduce maintenance cost for processing the bridge-head, and are obvious in economic benefit.

Description

Be used for wedge shape geotechnical grid cement earth structure and job practices that road and bridge connect
Technical field
The present invention relates to a kind of stable soil making roadbed that passes through, specifically be used for wedge shape geotechnical grid cement earth structure and job practices that road and bridge connect.
Background technology
At present both at home and abroad to the processing of this highway distress of bumping at bridge-head, the road-bridge transition section of being everlasting is provided with transition slab at bridge head, or carries out ground stabilization and handle, change like shallow-layer fill out, methods such as sand compaction pile, cement mixing pile, CFG stake and pile tube.From the engineering practice effect, relative settlement and transverse crack appear in transition slab at bridge head terminal road surface with the roadbed intersection easily, occur " secondary jumping car " problem easily, and its effect just will be jumped parking stall postpone and moved, and can not solve problem of bumping at bridge-head; When adopting the treatment of soft foundation mode,, can not eliminate the end of the bridge relative settlement because end of the bridge highway section embankment filled soil height is bigger at all; And adopt the flexible reinforcement technology of geosynthetics at the linkage section of geosynthetics with the end of the bridge platform back of the body, and can exist reinforcing rigidity not enough, the reinforcement body is stressed excessive and influence the problem of the deficiency of consolidation effect.Therefore it is imperative to study novel rational bridges and culverts platform back of the body packing technique.
Summary of the invention
The present invention overcomes deficiency of the prior art; Principle according to " rigid-flexibility transition " punishment bumping at bridge-head; A kind of wedge shape geotechnical grid cement reinforced earth bridges and culverts platform back of the body packing technique is provided, can reduces problem of bumping at bridge-head effectively, improve the comfortableness and the safety of driving; Greatly reduce simultaneously the maintenance costs that end of the bridge is handled, remarkable in economical benefits.
The objective of the invention is to realize through following technical scheme:
Utilize the novel stereochemical structure of geotechnical grid back-up coat and unique reinforcement mechanism; Formation good integrity, the flexible structure layer that rigidity is bigger adopt the modulus gradual change principle, consider ground and roadbed two parts sedimentation factor simultaneously; At road-bridge transition section the wedge shape stabilization zone is set; Arrange that through wedge shape cement stabilized soil and wedge shape geotechnical grid are set flexible structure layer one end is fixed in abutment, the other end links to each other with roadbed; Eliminate excessive relative settlement, realize the smooth transition of rigidity abutment and flexible subgrade modulus.
A kind of wedge shape geotechnical grid cement earth structure that is used for the road and bridge connection; Comprise cement stabilized soil 4, filler and geotechnical grid 3, an end of said geotechnical grid 3 is fixed on the bridges and culverts platform back of the body 2, and the other end is fixed on roadbed 5; Geotechnical grid 3 multilayer that laterally arranges from top to bottom; Filling filler and cement stabilized soil 4 between the adjacent two layers geotechnical grid 3, cement stabilized soil 4 are filled in the end of geotechnical grid 3 near the bridges and culverts platform back of the body 2, and the length of top layer cement stabilized soil is 1/2 ~ 3/4 of geotechnical grid length; All the other fill filler, and the length of cement stabilized soil 4 and geotechnical grid 3 is successively successively decreased from top to bottom and constituted wedge shape or terrace with edge.
The gradient of successively decreasing of preferred said cement stabilized soil 4 and geotechnical grid 3 is 1:1.The definition of the said gradient of successively decreasing is to reinforce height/(top layer length-bottom layer length).
Described a kind of job practices that is used for the wedge shape geotechnical grid cement earth structure of road and bridge connection may further comprise the steps:
(1) grade and the pressure of shaking
Foundation surface to the bridges and culverts platform back of the body 2 and the transitional region of roadbed flattens the pressure of shaking;
(2) lay bottom geotechnical grid, filler and cement stabilized soil
Geotechnical grid one end is fixed to the bridges and culverts platform back of the body 2, and the other end is fixed to roadbed, and stone adopts the artificial mode that combines with machinery; Earlier be filled to void and fill out thickness, again with the artificial dead angle of filling, leveling then with machinery; The stone of cement stabilized soil adopts the artificial mode that combines with machinery; Earlier be filled to void and fill out thickness, again with the artificial dead angle of filling, leveling then with machinery;
(3) compacting
Adopt the vibratory roller compacting;
(4) geotechnical grid, filler and cement stabilized soil and compacting are laid in repeating step (2) and (3); Finish compacting until the laying of top layer geotechnical grid.
The specification of said geotechnical grid 3 is the thick 1.25mm of geotechnical grid sheet material, lattice chamber height 10cm or 15cm, and weld apart from 40cm or 47cm the lattice chamber; Geotechnical grid intensity index: hot strength>=25MPa, stretch modulus>=650MPa, weld seam normal temperature peel strength>=100Ncm, low temperature brittleness temperature≤-50 ℃.
Beneficial effect of the present invention is:
1. economic benefit.Every year problem of bumping at bridge-head is repaired and needed to drop into substantial contribution to highway construction department, reduce the maintenance costs of annual end of the bridge processing.
2. social benefit.Reduce the highway bridgehead vehicle jump problem effectively, improve the comfortableness and the safety of driving, produce the good social benefit.
3. through cement stabilized soil and wedge shape geotechnical grid are arranged as wedge shape, eliminate excessive relative settlement, realize the smooth transition of rigidity abutment and flexible subgrade modulus.
Description of drawings
Fig. 1 is used for the sketch map of the wedge shape geotechnical grid cement earth structure of road and bridge connection for the present invention.
Among the figure: 1. foundation surface, 2. the bridges and culverts platform back of the body, 3. geotechnical grid, 4. cement stabilized soil, 5. roadbed end face.
The specific embodiment
The present invention is a kind of, and to be used for the wedge shape geotechnical grid cement earth structure that road and bridge connect as shown in Figure 1; Comprise cement stabilized soil 4, filler and geotechnical grid 3, an end of said geotechnical grid 3 is fixed on the bridges and culverts platform back of the body 2, and the other end is fixed on roadbed 5; Geotechnical grid 3 multilayer that laterally arranges from top to bottom; Filling filler and cement stabilized soil 4 between the adjacent two layers geotechnical grid 3, cement stabilized soil 4 are filled in the end of geotechnical grid 3 near the bridges and culverts platform back of the body 2, and the length of top layer cement stabilized soil is 1/2 ~ 3/4 of geotechnical grid length; All the other fill filler, and the length of cement stabilized soil 4 and geotechnical grid 3 is successively successively decreased from top to bottom and constituted wedge shape or terrace with edge.
The gradient of successively decreasing of preferred said cement stabilized soil 4 and geotechnical grid 3 is 1:1.The definition of the said gradient of successively decreasing is to reinforce height/(top layer length-bottom layer length).
Heavy line is represented geotechnical grid length among Fig. 1, and the heavy line direction is a length direction, and the height of top layer geotechnical grid is the reinforcing height of geotechnical grid, and the height of the height of top layer cement stabilized soil-bottom cement stabilized soil is the reinforcing height of cement stabilized soil,
The definition of wedge shape is in how much: upper bottom surface is a rectangle, and bottom surface is a line segment of parallel upper bottom surface, and two is trapezoidal in four sides, and two is triangle, and the wedge that such polyhedron is used like the carpenter is so claim that this kind solid is a wedge shape.
The fixed form that geotechnical grid is fixed on the bridges and culverts platform back of the body 2 can adopt existing connected mode to connect as adopting hinge type.
Geotechnical grid is fixed on roadbed and can adopts drill rod or filler to fix.
A kind of job practices that is used for the wedge shape geotechnical grid cement reinforced structure that road and bridge connect does not have corresponding construction requirement as a kind of new method in the current specifications, existing details are as follows with its construction technology:
(1) grade and the pressure of shaking
Foundation surface 1 to geotechnical grid will be installed flattens the pressure of shaking;
(2) lay bottom geotechnical grid, filler and cement stabilized soil
A at first inspects for acceptance to the geotechnical grid material of buying before construction, and material must have product certificate and test report, every 5000m 2Answer random sampling and test, the result must reach material specification and performance requirement.
The geotechnical grid specification: the thick 1.25mm of geotechnical grid sheet material, lattice chamber height 10cm or 15cm, weld apart from 40cm or 47cm the lattice chamber; Geotechnical grid intensity index: hot strength>=25MPa, stretch modulus>=650MPa, weld seam normal temperature peel strength>=100Ncm, low temperature brittleness temperature≤-50 ℃.
B carries on the back 2 mounting fixing parts at the bridges and culverts platform; Before installing, fixture on the bridges and culverts platform back of the body 2, ejects a horizon by the design elevation requirement with the prepared Chinese ink line earlier; On horizon, mark the target cross point with invar tape with the 20cm spacing then, use ail gun (or electricity favourable turn) to squeeze into the expansion bolt of φ 10~φ 12 holdfasts or same size in the bridges and culverts platform back of the body 2 then, again mounting fixing parts; After all installing, the inspection installation quality.
C carries out reasonable disposition according to the size of layout area to the different specification size of geotechnical grid.At first; Adopt steel fine (must take certain anti-corrosion measure) or the hinge type latch of φ 6 that geotechnical grid is connected on the fixture; Move geotechnical grid one end to specified size; Be fixed to roadbed with drill rod or filler, firmly open the monoblock geotechnical grid again, adjacent geotechnical grid plate adopts the whole connection of hinge type latch.After geotechnical grid is opened in stretch-draw fully, fix with drill rod or filler all around, otherwise, forbid to carry out the subsequent processing construction.
D lattice chamber filler is identical with roadbed filling, requires filler particles even, and maximum particle diameter must not be greater than 5cm.The void of every layer of lattice chamber filler is filled out thickness and is not more than 30cm, but should not be less than 20cm.Stone adopts the artificial mode that combines with machinery, the uniform filler of water content spacer-frame chamber gradually, when mechanical void is filled out thickness and reached requirement, fills near the dead angle abutment with artificial with bulldozer, flattens then.The lattice chamber before the filler, does not forbid plant equipment to be gone above that.Cement stabilized soil can adopt the job mix mode; By the construction of existing subgrade strengthening soil job specfication, the cement stabilized soil filler requires to stir, and stone adopts the artificial mode that combines with machinery; With bulldozer the uniform filler of water content spacer-frame chamber gradually; When machinery void is filled out thickness and reached requirement, fill dead angle, leveling then near the abutment with artificial.
(3) compacting
Adopt the vibratory roller compacting;
Platform back of the body subgrade compaction and current specifications require basically identical.Adopt the vibratory roller compacting in the construction.Near the platform back of the body, adopt small vibrating compacting machine and the compacting of ramming equipment, lattice chamber layer mechanical ramming number of times should be higher than other layers 1~2 time.Through the cement stabilized soil of mix, shaping, should in the time delay that test is confirmed, accomplish and roll.
(4) geotechnical grid, filler and cement stabilized soil and the compacting on upper strata laid in repeating step (2) and (3); Finish compacting until the laying of top layer geotechnical grid.
After finishing, construction inspects for acceptance:
1. the abutment soft patch is inspected for acceptance with degree of compaction standard, and its construction pressure degree is identical with this position Subgrade Compaction;
2. abutment fixedly holdfast check by 2% of holdfast sum, require holdfast anchored force >=1kN;
3. the coordinative construction progress is carried out the on-the-spot test of projects such as sedimentation, the modulus of resilience, modulus of deformation to each abutment, obtains call parameter.

Claims (4)

1. one kind is used for the wedge shape geotechnical grid cement earth structure that road and bridge connect; Comprise cement stabilized soil (4), filler and geotechnical grid (3); It is characterized in that an end of said geotechnical grid (3) is fixed on the bridges and culverts platform back of the body (2), the other end is fixed on roadbed (5); Geotechnical grid (3) multilayer that laterally arranges from top to bottom; Filling filler and cement stabilized soil (4) between the adjacent two layers geotechnical grid (3), cement stabilized soil (4) are filled in the end of geotechnical grid (3) near the bridges and culverts platform back of the body (2), and the length of top layer cement stabilized soil is 1/2 ~ 3/4 of geotechnical grid length; All the other fill filler, and the length of cement stabilized soil (4) and geotechnical grid (3) is successively successively decreased from top to bottom and constituted wedge shape or terrace with edge.
2. wedge shape geotechnical grid cement earth structure according to claim 1 is characterized in that the gradient of successively decreasing of said cement stabilized soil (4) and geotechnical grid (3) is 1:1.
3. wedge shape geotechnical grid cement earth structure according to claim 2 is characterized in that, the definition of the said gradient of successively decreasing is to reinforce height/(top layer length-bottom layer length).
4. the described a kind of job practices that is used for the wedge shape geotechnical grid cement earth structure of road and bridge connection of claim 1 is characterized in that, may further comprise the steps:
(1) grade and the pressure of shaking
The foundation surface of the bridges and culverts platform being carried on the back the transitional region of (2) and roadbed flattens the pressure of shaking;
(2) lay bottom geotechnical grid, filler and cement stabilized soil
Geotechnical grid one end is fixed to the bridges and culverts platform back of the body (2), and the other end is fixed to roadbed, and stone adopts the artificial mode that combines with machinery; Earlier be filled to void and fill out thickness, again with the artificial dead angle of filling, leveling then with machinery; The stone of cement stabilized soil adopts the artificial mode that combines with machinery; Earlier be filled to void and fill out thickness, again with the artificial dead angle of filling, leveling then with machinery;
(3) compacting
Adopt the vibratory roller compacting;
(4) geotechnical grid, filler and cement stabilized soil and compacting are laid in repeating step (2) and (3); Finish compacting until the laying of top layer geotechnical grid.
CN2012101045405A 2012-04-11 2012-04-11 Wedge-shaped Geocell cement reinforced soil structure for road-bridge connection and construction method thereof Pending CN102635104A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106087758A (en) * 2016-08-06 2016-11-09 桂林理工大学 A kind of construction method of the road and bridge attachment structure for slowing down bumping at bridge-head
CN106192649A (en) * 2016-07-21 2016-12-07 桂林理工大学 A kind of construction method processing problem of bumping at bridge-head
CN106284053A (en) * 2016-08-06 2017-01-04 桂林理工大学 A kind of road and bridge attachment structure effectively slowing down bumping at bridge-head
CN107905089A (en) * 2017-11-21 2018-04-13 中冶南方城市建设工程技术有限公司 A kind of reinforcement platform back of the body for preventing bumping at bridge-head and its construction method
CN110042715A (en) * 2019-04-29 2019-07-23 杭州悦为科技有限公司 The construction method of the hard and soft combination soil stabilization system of Abutment Back

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CN1455050A (en) * 2003-05-30 2003-11-12 长安大学 Highway bridge abutment wedge flexible attachment strap
CN2627055Y (en) * 2003-05-30 2004-07-21 长安大学 U-form abutment soft patch
KR20090130637A (en) * 2008-06-16 2009-12-24 한국철도기술연구원 Fill-up structure for back-area of rigid structure and construction method of the same
CN202730735U (en) * 2012-04-11 2013-02-13 华南理工大学 Wedge-shaped geocell cement reinforced soil structure for road and bridge connection

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106192649A (en) * 2016-07-21 2016-12-07 桂林理工大学 A kind of construction method processing problem of bumping at bridge-head
CN106087758A (en) * 2016-08-06 2016-11-09 桂林理工大学 A kind of construction method of the road and bridge attachment structure for slowing down bumping at bridge-head
CN106284053A (en) * 2016-08-06 2017-01-04 桂林理工大学 A kind of road and bridge attachment structure effectively slowing down bumping at bridge-head
CN107905089A (en) * 2017-11-21 2018-04-13 中冶南方城市建设工程技术有限公司 A kind of reinforcement platform back of the body for preventing bumping at bridge-head and its construction method
CN110042715A (en) * 2019-04-29 2019-07-23 杭州悦为科技有限公司 The construction method of the hard and soft combination soil stabilization system of Abutment Back

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Application publication date: 20120815