CN103821060B - A kind of construction method of existing highway soft foundation Treating technology - Google Patents
A kind of construction method of existing highway soft foundation Treating technology Download PDFInfo
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- CN103821060B CN103821060B CN201410078536.5A CN201410078536A CN103821060B CN 103821060 B CN103821060 B CN 103821060B CN 201410078536 A CN201410078536 A CN 201410078536A CN 103821060 B CN103821060 B CN 103821060B
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Abstract
The invention discloses a kind of construction method of existing highway soft foundation Treating technology, comprise in the setting-out of stake position, construction of diaphragm wall, prestress wire stretch-draw and embankment and arrange the steps such as high-pressure rotary jet grouting pile, the present invention effectively can improve the intensity of existing highway soft foundation, its settlement amount after construction of effective control, do not affect existing speedway to be open to traffic and to avoid embankment dig on a wide area and to construct the expense produced, solve the technical barrier of existing highway soft foundation settlement after construction.
Description
Technical field
The present invention relates to a kind of highway soft foundation reinforcement means, be specifically related to a kind of construction method of existing highway soft foundation Treating technology.
Background technology
Speedway is very high to foundation requirement, must reach the service object that " fast, safety, economy, comfortable " is such after building up.If road surface is ups and downs, the comfortableness of driving will be affected, hinder the quick of driving, and road surface pocket or the end of the bridge discrepancy in elevation cause and jump car and the impact force that produces, pavement roughness can be made to aggravate further, form vicious circle, the probability that subgrade defect produces will strengthen further, and then affect traffic safety and cause tremendous economic to lose, reinforcing strengthening must be carried out to its roadbed.At present conventional subgrade strengthening method mainly comprises cushion, slip casting method, rotary churning pile method, closes bedding, compaction pile, reinforced earth etc., but exists when said method is used for both wired reinforcings and affect circuit operation, Part Methods cannot improve soil property or there is the problems such as consolidation effect is undesirable.Therefore, for the deficiency in above-mentioned conventional method punishment settlement of soft foundation technology and limitation, invent a kind of existing highway soft foundation Treating technology not affecting existing line operation extremely urgent.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, under solving vehicle cycle dynamic loading, speedway relative settlement problem is runed in Soft Soil Districts, the invention provides a kind of construction method of existing highway soft foundation Treating technology.
Technical scheme: for solving the problems of the technologies described above, the construction method of a kind of existing highway soft foundation Treating technology provided by the invention, comprises the following steps:
1) according to embankment situation and the geological conditions of existing speedway, the construction lofting of diaphragm wall position is carried out along embankment direction; , stake footpath long according to the stake of designing requirement, pile spacing and angle of inclination, on the both sides side slope of embankment of existing speedway, carry out the construction lofting of high-pressure rotary jet grouting pile position;
2) according to the diaphragm wall degree of depth and the intensity of design, construction diaphragm wall, and every 50 ~ 100m, reinforcement cage skeleton is set in diaphragm wall;
3) utilize horizontal directional drilling machine, by steel strand horizontal through ground, arranging 0.5 ~ 0.8m place, below the diaphragm wall top of reinforcement cage skeleton, fixing also tension steel strand, becomes prestress wire; Intensity and the stretch-draw intensity of prestress wire are determined according to designing requirement;
4) utilize jet grouting pile driving machine, according to designing requirement, on existing Effect on Embankment Slope of Expressway, Construction of High Pressure Jet Grouting Pile is tilted to existing highway soft foundation;
5) above-mentioned steps 1 is repeated) ~ 4), complete overall existing highway soft foundation punishment construction.
As preferably, described step 2) in, construction of diaphragm wall first do before digging foundation trench protection foundation trench suitable for reading lead wall, with mud off; By the wide segmentation grooving dark in wall of wall of design, be symmetrical arranged a pair reinforcement cage skeleton every 50 ~ 100m in the diaphragm wall of roadbed both sides, with tremie concrete, form one section of steel concrete diaphragm wall.Diaphragm wall adopts waterproof concrete material, gel material content: adopt during cobble and must not be less than 370kg/m
3, adopt during rubble and must not be less than 400kg/m
3, water-cement ratio must not be greater than 0.55, and the slump must not be less than 180mm.
As preferably, in described step 3), the upper end of prestress wire exposes diaphragm wall external surface 30 ~ 40cm, to place external anchor steel plate; Intensity and the stretch-draw intensity of prestress wire are determined according to designing requirement; External anchor steel plate is rectangular steel plates, and its length is 400 ~ 800mm, and wide is 300 ~ 500mm, and thickness is 20 ~ 50mm.After external anchor steel plate arranges, Shi Hanzhang is carried out to it.The size of Shi Hanzhang requires to determine according to soft base self character and soft base Deformation control.Outside prestress wire and external anchor steel plate, be coated with red paint or pitch thin layer does preservative treatment, to improve the corrosion resistance of prestress wire, extend its application life.
As preferably, in described step 4), along angle 10 ° ~ 90 ° inclined drills with horizontal plane on the side slope of embankment of existing speedway both sides, continue to creep into soft base after creeping into embankment, reach design elevation.Embankment bilateral symmetry arranges high-pressure rotary jet grouting pile, and often arrange and put 3 ~ 5 high-pressure rotary jet grouting piles in the every side of embankment, pile spacing 1.5 ~ 2.2m, stake reaches designing requirement.High-pressure rotary jet grouting pile adopts intensity to be the ordinary portland cement of 42.5, and water/binder ratio is 1:1 ~ 1:2.Grouting Pipe hoisting velocity is 10 ~ 15cm/min; Rotary speed is 10 ~ 20r/min.Slurry pressure is 18 ~ 22MPa; Flow is 55 ~ 60L/min.Air pressure is 0.5 ~ 0.9MPa; Flow is 0.6 ~ 0.7m
3/ min.After being disposed, drawing hole embankment section cement paste and backfill.
Beneficial effect: the present invention can effectively control weak soil lateral displacement by the combination of diaphragm wall and prestress wire, and the running pulp problem in Construction of High Pressure Jet Grouting Pile; High-pressure rotary jet grouting pile can realize reinforcement to the soft base in existing embankment bottom, metathesis, improves bearing capacity of foundation soil on the whole, reduces Embankment Subsidence.The present invention effectively can improve the intensity of existing highway soft foundation and control its settlement amount after construction, be applicable to run in soft soil foundation the long-term settlement that speedway causes due to factor impacts such as vehicle cycle dynamic loads administer, this technical method does not affect existing speedway and is open to traffic and avoids embankment dig on a wide area and to construct the expense produced, and has that construction is simple, short construction period and an advantage such as expense is low.
Accompanying drawing explanation
Fig. 1 is the longitudinal profile structural representation of the embodiment of the present invention;
Fig. 2 is the A-A sectional view of Fig. 1;
In figure: 1 embankment, 2 supercrusts, 4 high-pressure rotary jet grouting piles, 5 external anchor steel plates, 6 prestress wires, 7 diaphragm walls, 8 Soft Soil Layer grounds, 9 hardpan grounds, 10 reinforcement cage skeletons, 11 side slope of embankment.
Detailed description of the invention
The specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing.Protection scope of the present invention is not limited only to the description of present embodiment.
Structure after adopting the construction method of a kind of existing highway soft foundation Treating technology of the present embodiment to administer as illustrated in fig. 1 and 2, comprise the embankment 1 below supercrust 2, high-pressure rotary jet grouting pile 4 is furnished with in side slope of embankment 11, below embankment 1, the hardpan ground 9 of both sides moves towards diaphragm wall 7 consistent and arranged in parallel with having in Soft Soil Layer ground 8 with supercrust 2, in diaphragm wall 7, compartment of terrain is provided with reinforcement cage skeleton 10, in relative reinforcement cage skeleton 9, stretch-draw has prestress wire 6, and the end of prestress wire 6 is provided with external anchor steel plate 5.
During construction, the construction method of a kind of existing highway soft foundation Treating technology of the present embodiment comprises the following steps:
Step one, smooth location, the setting-out of stake position.
Smooth location, the setting-out of stake position, according to embankment 1 situation and the geological conditions of existing speedway, carries out diaphragm wall 7 setting-outs along embankment 1 direction; According to the pile spacing of designing requirement, on the both sides side slope of embankment 11 of existing speedway, carry out the stake position setting-out of high-pressure rotary jet grouting pile 4 by designing requirement.
Step 2, construction of diaphragm wall.
What before digging foundation trench, first do protection foundation trench was suitable for reading leads wall; with mud off; wide and the dark segmentation grooving by the wall of design; place every 50 ~ 100m in the diaphragm wall of reinforcement cage skeleton 10(roadbed both sides and be arranged symmetrically with reinforcement cage skeleton 10; displace slurry coat method with tremie concrete, form one section of reinforced concrete wall.Sequential production becomes diaphragm wall 7 piecemeal.Diaphragm wall 7 should adopt waterproof concrete, gel material content: adopt during cobble and must not be less than 370kg/m
3, adopt time rubble (the present embodiment is rubble) and must not 400kg/m be less than
3(the present embodiment is 420kg/m
3), it is 0.52 that water-cement ratio must not be greater than 0.55(the present embodiment), it is 185mm that the slump must not be less than 180mm(the present embodiment).
Step 3, prestress wire is arranged and stretch-draw.
Reinforcement cage skeleton 10 position (the present embodiment is 0.5m) is had at the downward 0.5 ~ 0.8m in diaphragm wall 7 top, a prestress wire 6 is arranged symmetrically with along embankment cross section, make it run through and be reinforced roadbed, and to ensure that the upper end of prestress wire 6 exposes diaphragm wall 7 external surface 30 ~ 40cm(the present embodiment be 35cm), to place external anchor steel plate 5, described prestress steel twist line strength 6 is determined according to designing requirement with stretch-draw intensity; External anchor steel plate 5 is rectangular steel plates, and its long 400 ~ 800mm(the present embodiment is 500mm), the wide 300 ~ 500mm(of being the present embodiment is 300mm), thickness is 20 ~ 50mm(the present embodiment is 25mm).After external anchor steel plate 5 arranges, Shi Hanzhang is carried out to it.The size of Shi Hanzhang need meet the deformation requirements of ground.Outside prestress wire 6 and external anchor steel plate 5, be coated with red paint or pitch thin layer does preservative treatment, to improve the corrosion resistance of prestress wire 6 and external anchor steel plate 5, extend its application life.
Step 4, in existing Expressway Embankment, Construction of High Pressure Jet Grouting Pile.
In existing Expressway Embankment, along angle 10 ° ~ 90 ° (the present embodiment 4 borings are respectively 20 °, 45 °, 60 °, the 75 °) inclined drill with horizontal plane on both sides side slope of embankment 11, continue to creep into ground after creeping into embankment, reach design elevation.Embankment bilateral symmetry arranges high-pressure rotary jet grouting pile 4, often arrange and put 3 ~ 5 (the present embodiment is 4) high-pressure rotary jet grouting piles 4 in the every side of embankment, pile spacing 0.1 ~ 2m(the present embodiment is 1m), stake reaches designing requirement (stake of the present embodiment 4 pile is long is respectively 9m, 13m, 18m, 25m).High-pressure rotary jet grouting pile 4 adopt intensity be 42.5 ordinary portland cement, water/binder ratio is 1:1 ~ 1:2(the present embodiment is 1:1.25).Grouting Pipe hoisting velocity 10 ~ 15cm/min(the present embodiment is 12cm/min); Rotary speed 10 ~ 20r/min(the present embodiment is 15r/min).Slurry pressure is 18 ~ 22MPa(the present embodiment is 20MPa); Flow is 58 ~ 60L/min(the present embodiment is 60L/min).Air pressure is 0.5 ~ 0.9MPa(the present embodiment is 0.6MPa); Flow is 0.6 ~ 0.7m
3/ min(the present embodiment is 0.7m
3/ min).After being disposed, drawing hole embankment section cement paste and backfill.
Repeat above-mentioned steps one to four, finally complete existing highway soft foundation punishment construction.
The mode that the present invention adopts diaphragm wall, prestress wire to combine with high-pressure rotary jet grouting pile, by diaphragm wall Shi Hanzhang, what can realize existing highway soft foundation is compacted, effectively limits the sedimentation and deformation of ground; By high-pressure rotary jet grouting pile, the reinforcement to existing embankment, displacement can be realized, the compactness of roadbed can be improved on the whole, improve the function controlling Embankment Subsidence.The present invention effectively improves the strength and stability of existing highway soft foundation, effectively limit the sedimentation of embankment and ground, and overcome the defect be open to traffic by embankment heavy excavation again construction infection, the advantage such as there is simple, easy to operate, the short construction period of construction and operating expenses is low.
Claims (4)
1. a construction method for existing highway soft foundation Treating technology, is characterized in that comprising the following steps:
1) according to embankment situation and the geological conditions of existing speedway, the construction lofting of diaphragm wall position is carried out along embankment direction; , stake footpath long according to the stake of designing requirement, pile spacing and angle of inclination, on the both sides side slope of embankment of existing speedway, carry out the construction lofting of high-pressure rotary jet grouting pile position;
2) according to the diaphragm wall degree of depth and the intensity of design, construction diaphragm wall, and every 50 ~ 100m, reinforcement cage skeleton is set in diaphragm wall;
3) utilize horizontal directional drilling machine, by steel strand horizontal through ground, arranging 0.5 ~ 0.8m place, below the diaphragm wall top of reinforcement cage skeleton, fixing also tension steel strand, becomes prestress wire; Intensity and the stretch-draw intensity of prestress wire are determined according to designing requirement;
4) utilize jet grouting pile driving machine, according to designing requirement, on existing Effect on Embankment Slope of Expressway, Construction of High Pressure Jet Grouting Pile is tilted to existing highway soft foundation;
5) above-mentioned steps 1 is repeated) ~ 4), complete overall existing highway soft foundation punishment construction.
2. the construction method of a kind of existing highway soft foundation Treating technology according to claim l, is characterized in that: described step 2) in, reinforcement cage skeleton is symmetrical arranged in the diaphragm wall of roadbed both sides every 50 ~ 100m.
3. the construction method of a kind of existing highway soft foundation Treating technology according to claim l, is characterized in that: in described step 3), and the diameter of prestress wire, intensity and stretch-draw intensity are determined according to designing requirement.
4. the construction method of a kind of existing highway soft foundation Treating technology according to claim l, is characterized in that: in described step 4), and the angle of high-pressure rotary jet grouting pile and horizontal plane is 10 ° ~ 90 °; The intensity of high-pressure rotary jet grouting pile, length and angle of inclination are determined according to designing requirement.
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Cited By (1)
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| CN110004906A (en) * | 2019-04-04 | 2019-07-12 | 北京思创佳德桩工机械制造有限公司 | A method of Highway Settlement is administered using screw pile |
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| CN104894935B (en) * | 2015-04-03 | 2017-07-28 | 重庆大学 | A kind of existing highway or railroad embankment lighting subsidence control method |
| CN107858934A (en) * | 2017-12-13 | 2018-03-30 | 中铁二十三局集团有限公司 | The small spacing abutment constructing structure and its construction method of neighbouring running railway line |
| CN110144784A (en) * | 2019-06-13 | 2019-08-20 | 福建工程学院 | The town road and its construction method constructed based on prestressed concrete plate stake |
| CN110438851A (en) * | 2019-08-14 | 2019-11-12 | 广州大学 | A kind of rotary churning pile vibration isolation barrier and its construction method |
| CN110761337A (en) * | 2019-09-23 | 2020-02-07 | 中国地质大学（武汉） | Underground horizontal impervious layer construction method based on horizontal directional drilling technology |
| CN112941976B (en) * | 2019-12-11 | 2023-02-28 | 北京恒祥宏业基础加固技术有限公司 | Construction method for settlement, lifting and reinforcement of high-speed railway foundation in karst area |
| CN111962532A (en) * | 2020-07-16 | 2020-11-20 | 中铁十五局集团路桥建设有限公司 | Construction method for reinforcing existing railway roadbed side slope inclined high-pressure jet grouting pile |
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| JP4837849B2 (en) * | 2001-08-22 | 2011-12-14 | 株式会社テノックス | Construction method of soil cement composite pile |
| CN2793158Y (en) * | 2005-03-04 | 2006-07-05 | 铁道科学研究院铁道建筑研究所 | Porous pipe for cement casting at transitting section of present bridge |
| CN101886382B (en) * | 2010-06-22 | 2012-05-23 | 中铁第四勘察设计院集团有限公司 | Soft foundation reinforcing method of existing railway or highway subgrade construction |
| CN102864712B (en) * | 2012-10-16 | 2014-11-26 | 中铁第四勘察设计院集团有限公司 | Method and structure for micro-disturbance renovating of existing high speed railway subgrade deformation disease |
| CN102926303A (en) * | 2012-11-22 | 2013-02-13 | 河海大学 | Method for reinforcing soft soil foundation settlement control pile foundation bracket of high-grade highway in use |
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| CN110004906A (en) * | 2019-04-04 | 2019-07-12 | 北京思创佳德桩工机械制造有限公司 | A method of Highway Settlement is administered using screw pile |
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