CN102619218B - Rear slotting reinforcing cage CFG and piling method thereof - Google Patents
Rear slotting reinforcing cage CFG and piling method thereof Download PDFInfo
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- CN102619218B CN102619218B CN201210116281.8A CN201210116281A CN102619218B CN 102619218 B CN102619218 B CN 102619218B CN 201210116281 A CN201210116281 A CN 201210116281A CN 102619218 B CN102619218 B CN 102619218B
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Abstract
The invention discloses a kind of rear slotting reinforcing cage CFG, comprise cement, flyash and crushed stone compound packed layer, it is characterized in that: it also comprises the cage type framework being fixedly connected with formation primarily of some main muscle with stirrup, described cement, flyash and crushed stone compound packed layer dense packing effect is at cage type lower portion and extension covers cage type framework periphery.The present invention by arranging cage type framework in cement, flyash and crushed stone compound packed layer, the present invention is made to can be used for sloped ground, partly fill out and partly dig ground and mud, silt soil strata etc. and easily produce the consolidation process that larger horizontal force and settlement after construction control very strict high-speed railway foundation, greatly strengthen CFG Compound Foundation horizontal shear intensity, guarantee the sedimentation of high-speed railway subgrade and stable to meet the demands.In addition, the present invention has obvious Social benefit and economic benefit.Under the same terms, rear slotting reinforcing cage CFG compared with small bore stake (diameter 60cm), cost savings nearly 1/3.
Description
Technical field
The present invention relates to the foundation consolidating technology field of railway, highway, water conservancy and civilian construction, be specifically related to a kind of rear slotting reinforcing cage CFG and piling method thereof.
Technical background
High-speed railway subgrade engineering requires high to sedimentation especially differential settlement, fill out partly dig ground and the soft foundation such as mud, mucky soil adopts the treatment technology such as bored pile, pile tube owing to easily producing larger horizontal force for sloped ground, partly, processing cost is high.CFG is as a kind of complex ground treatment means of routine, because of its easy construction, easy to control the quality, cost is lower and extensively use in railway engineering, but often quality problems occur by the impact of many factors when processing the soft foundation such as mud, mucky soil.
Summary of the invention
The object of the invention is for above-mentioned technical problem, a kind of rear slotting reinforcing cage CFG and piling method thereof are provided, the method can keep its fastening strength when carrying out consolidation process to soft foundations such as sloped ground, mud, mucky soils, and advantage of lower cost.
For realizing this object, rear slotting reinforcing cage CFG designed by the present invention, comprise cement, flyash and crushed stone compound packed layer, it is characterized in that: it also comprises the cage type framework being fixedly connected with formation primarily of some main muscle with stirrup, described cement, flyash and crushed stone compound packed layer dense packing effect is at cage type lower portion and extension covers cage type framework periphery.
Length >=the 6m of described cage type framework, the bottom of described cage type framework is conical mount, some radial stiffeners are provided with in described cage type framework, described some radial stiffeners form radial reinforcing bar internal reservation space in cage type framework, and described radial reinforcing bar internal reservation is spatially located at the center of cage type framework.
Length >=the 12m of described cage type framework, the middle part of described cage type framework is fixedly connected with locator.
Maximum particle diameter≤the 2cm of described cement, flyash and crushed stone compound packed layer medium stone.
The piling method of above-mentioned rear slotting reinforcing cage CFG, it comprises the steps:
Step 1) to put at high-speed railway sloped ground or soft foundation maintenance to be added and get out stake holes;
Step 2) in described stake holes, pour into cement, flyash and crushed stone compound, form cement, flyash and crushed stone compound packed layer;
Step 3) cement, flyash and crushed stone compound packed layer ot-yet-hardened in described stake holes time insert cage type framework, the insertion time of whole cage type framework is no more than 30 minutes;
Step 4) after the cement, flyash and crushed stone compound intensity in stake holes reaches 80% of age strength, cut pile crown to design elevation, namely form required rear slotting reinforcing cage CFG.
In described step 3, as the length < 4m of cage type framework, adopt the pressure cage type framework of 1300 ~ 1600KN, and ensure the verticality of cage type framework, after in cage type framework insertion cement, flyash and crushed stone compound packed layer more than 3m, back and forth by cage type framework handling about 30cm, then adjust verticality and transfer cage type framework.
In described step 3, when the length of cage type framework is 4 ~ 6m, fix plank at the top of cage type framework, adopt the pressure plank of 4000 ~ 6000KN, cage type framework is inserted in cement, flyash and crushed stone compound packed layer, presses down in process and control the verticality of cage type framework well.
In described step 3, when the length of cage type framework is greater than 6m, by plate vibration inserter, cage type framework is inserted in cement, flyash and crushed stone compound packed layer, described plate vibration inserter comprises plate vibrator, top board, the card tip and steel pipe, wherein, top board is fixedly connected with plate vibrator, and one end of described steel pipe is fixedly connected with top board; Steel pipe is placed in cage type framework, and is fixedly connected with cage type framework by the card tip, and described top board is placed in the top of cage type framework, and the other end of described steel pipe is pyramidal structure, and the other end of steel pipe is fixedly connected with the bottom of cage type framework.
Cement in described cement, flyash and crushed stone compound packed layer: flyash: sand: rubble: Admixture: the ratio of water is 190: 118: 823: 1091: 3.08: 178.
In described cement, flyash and crushed stone compound packed layer, the slump of cement, flyash and crushed stone compound is 180mm ~ 200mm.
The present invention by arranging cage type framework in cement, flyash and crushed stone compound packed layer, the present invention is made to can be used for sloped ground, partly fill out and partly dig ground and mud, silt soil strata etc. and easily produce the consolidation process that larger horizontal force and settlement after construction control very strict high-speed railway foundation, greatly strengthen CFG Compound Foundation horizontal shear intensity, guarantee the sedimentation of high-speed railway subgrade and stable to meet the demands.In addition, the present invention has obvious Social benefit and economic benefit.Under the same terms, rear slotting reinforcing cage CFG compared with small bore stake (diameter 60cm), cost savings nearly 1/3.
The present invention has following advantage relative to ordinary Portland cement flyash gravel pile on the whole:
(1) pile body top bulk strength increases.The rear slotting relative ordinary Portland cement flyash gravel pile of reinforcing cage CFG, because top is inserted with reinforcing cage, the intensity of stake is taken on a new look greatly, and globality is better.
(2) pile body horizontal shear strength strengthens
Rear slotting reinforcing cage CFG stake is after insertion reinforcing cage, and pile body upper level shear resistance strengthens, and is more suitable in the larger basement process of the horizontal shears such as sloped ground.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is that the I-I of Fig. 1 is to sectional view;
Fig. 3 is the structural representation in the present invention as the length >=6m of cage type framework 4;
Fig. 4 is that the A-A of Fig. 3 is to sectional view;
Fig. 5 is the structural representation in the present invention as the length >=12m of cage type framework 4;
Fig. 6 is the structural representation that middle plateform of the present invention vibration inserter inserts cage type framework;
Wherein, the main muscle of 1-, 2-stirrup, 3-cement, flyash and crushed stone compound packed layer, 4-cage type framework, 5-locator, 6-plate vibration inserter, 6.1-plate vibrator, 6.2-top board, the 6.3-card tip, 6.4-steel pipe, the radial stiffener of 7-, 8-conical mount, the radial reinforcing bar internal reservation space of 9-.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail:
Rear slotting reinforcing cage CFG as shown in the figure, comprise cement, flyash and crushed stone compound packed layer 3, it also comprises the cage type framework 4 being fixedly connected with formation primarily of some main muscle 1 with stirrup 2, and cement, flyash and crushed stone compound packed layer 3 dense packing effect covers cage type framework 4 periphery inner also extension of cage type framework 4.Above-mentioned cage type framework 4 is reinforcing cage.
In technique scheme, as the length >=6m of cage type framework 4, the bottom design of this cage type framework 4 is conical mount 8, some radial stiffeners 7 are provided with in described cage type framework 4, some radial stiffeners 7 form radial reinforcing bar internal reservation space 9 in cage type framework 4, and described radial reinforcing bar internal reservation space 9 is positioned at the center of cage type framework 4.Reinforcing cage cage body top, bottom uniform force in decentralization process can be made by improving reinforcing cage structure, transfer smoothly, and cage body and pile body be without destruction.Described radial reinforcing bar internal reservation space 9 facilitates the steel pipe of plate vibration inserter 6 to insert 6.4 and centering.
In technique scheme, as the length >=12m of cage type framework 4, the centering in stake decentralization process controls comparatively difficulty, adopts outside in the middle part of cage type framework 4 to be welded with the directed support of ear and locator 5.Above-mentioned locator 5 welds after adopting 2 Φ 16 bar bendings side by side, and bending height is 5cm.Hoop often organizes uniform welding 4, and every 3m welds one group.
In technique scheme, the maximum particle diameter≤2cm of described cement, flyash and crushed stone compound packed layer 3 medium stone.The too little pile body structure requirement that can not meet CFG of the maximum particle diameter of above-mentioned rubble, then easily causes cage type framework 4 to transfer difficulty too greatly.In addition in the decentralization process of cage type framework 4 because of ballast grain sizes extrude too greatly and mutually after the uniformity of destructible material of body of a pile, coarse-fine aggregate segregation is serious.
The piling method of above-mentioned rear slotting reinforcing cage CFG, it comprises the steps:
Step 1) to put at high-speed railway sloped ground or soft foundation maintenance to be added and get out stake holes;
Step 2) in described stake holes, pour into cement, flyash and crushed stone compound, form cement, flyash and crushed stone compound packed layer 3;
Step 3) cement, flyash and crushed stone compound packed layer 3 ot-yet-hardened in described stake holes time insert cage type framework 4, general control starts to insert cage type framework 4 in 5 minutes after cement, flyash and crushed stone compound packed layer 3 sends into hole, and the insertion time of whole cage type framework 4 is no more than 30 minutes; After cage type framework 4 inserts, moving long spiral drilling machine is constructed to next position, hole.When processing soft stratum, easily altering hole phenomenon, should construct every hole.
Step 4) after the cement, flyash and crushed stone compound intensity in stake holes reaches 80% of age strength, cut pile crown to design elevation, namely form required rear slotting reinforcing cage CFG.Similar with castinplace pile, in order to ensure the intensity on stake top, generally all can 0.2 ~ 0.5m longer than designing pile length, be called empty stake, after pile, need to adopt artificial or plant equipment to cut.
Step 5) carry out detection of construction quality after pile.After having constructed 28 days, the frequency by 0.2% carries out Single pile static load test and boring and coring detects, and evaluates strengthening quality.Carry out low strain dynamic dynamic test detection pile integrity by the frequency of 10% simultaneously.
In technique scheme, under standard curing condition, cube (150mm × 150mm × 150mm) intensity should reach C20 standard to cement, flyash and crushed stone compound packed layer 3 the 28 day length of time.
In described step 3, as the length < 4m of cage type framework 4, the mode manually pressed down is used to adopt the pressure cage type framework 4 of 1300 ~ 1600KN, and ensure the verticality of cage type framework 4, when cage type framework 4 to insert in cement, flyash and crushed stone compound packed layer 3 after more than 3m, back and forth by cage type framework 4 handling about 30cm, then adjust verticality and transfer cage type framework 4.
In described step 3, when the length of cage type framework 4 is 4 ~ 6m, plank is fixed at the top of cage type framework 4, the mode using machine to press down adopts the pressure plank of 4000 ~ 6000KN, cage type framework 4 is inserted in cement, flyash and crushed stone compound packed layer 3, presses down in process and control the verticality of cage type framework 4 well.Press down middle control downforce and guarantee that reinforcing cage is indeformable.
The too small meeting of above-mentioned downforce makes reinforcing cage to press down to put in place, and downforce is crossed conference and caused reinforcing cage to be out of shape.
In above-mentioned steps 3, when the length of cage type framework 4 is greater than 6m, by plate vibration inserter 6, cage type framework 4 is inserted in cement, flyash and crushed stone compound packed layer 3, plate vibration inserter 6 comprises plate vibrator 6.1, top board 6.2, the card tip 6.3 and steel pipe 6.4, wherein, top board 6.2 is fixedly connected with plate vibrator 6.1, one end of steel pipe 6.4 is fixedly connected with top board 6.2; Steel pipe 6.4 is placed in cage type framework 4, and is fixedly connected with cage type framework 4 by the card tip 6.3, and top board 6.2 is placed in the top of cage type framework 4, and the other end of steel pipe 6.4 is pyramidal structure, and the other end of steel pipe 6.4 is fixedly connected with the bottom of cage type framework 4.The power of impulsing of plate vibration inserter 6 is utilized to transfer cage type framework 4 to projected depth.Recommend according to field trial: exciting force 9-16KN; Non-loaded amplitude 0.4-1.0 (MMM); Shake 50-100 (HZ) frequently.
In technique scheme, rear reinforcing cage CFG of inserting is owing to inserting thereafter the particularity of reinforcing cage, require high to the match ratio of material of body of a pile mix, for ensureing that strength of the mixing pile reaches C20 standard, simultaneously in order to the smooth insertion of follow-up reinforcing cage, need selected rational CFG stake (CFG) material of body of a pile match ratio.Cement in cement, flyash and crushed stone compound packed layer 3: flyash: sand: rubble: Admixture: the ratio of water is preferably 190: 118: 823: 1091: 3.08: 178.
In technique scheme, due to also will reinforcing cage be inserted after in compound fill orifice, be the smooth insertion ensureing reinforcing cage, must control concrete workability well.In described cement, flyash and crushed stone compound packed layer 3, the slump of cement, flyash and crushed stone compound is 180mm ~ 200mm.
The content that this manual is not described in detail belongs to the known prior art of professional and technical personnel in the field.
Claims (1)
1. insert the piling method of reinforcing cage CFG after one kind, described rear slotting reinforcing cage CFG comprises cement, flyash and crushed stone compound packed layer (3), it is characterized in that: it also comprises the cage type framework (4) being fixedly connected with formation primarily of some main muscle (1) with stirrup (2), described cement, flyash and crushed stone compound packed layer (3) dense packing effect covers cage type framework (4) periphery inner also extension of cage type framework (4); The bottom of described cage type framework (4) is conical mount (8), some radial stiffeners (7) are provided with in described cage type framework (4), described some radial stiffeners (7) form radial reinforcing bar internal reservation space (9) in cage type framework (4), and described radial reinforcing bar internal reservation space (9) is positioned at the center of cage type framework (4); The middle part of described cage type framework (4) is fixedly connected with locator (5); Maximum particle diameter≤the 2cm of described cement, flyash and crushed stone compound packed layer (3) medium stone;
Above-mentioned locator (5) welds after adopting 2 Φ 16 bar bendings side by side, and bending height is 5cm, and hoop often organizes uniform welding 4, and every 3m welds one group;
The piling method of this rear slotting reinforcing cage CFG comprises the steps:
Step 1) to put at high-speed railway sloped ground or soft foundation maintenance to be added and get out stake holes;
Step 2) in described stake holes, pour into cement, flyash and crushed stone compound, form cement, flyash and crushed stone compound packed layer (3);
Step 3) cement, flyash and crushed stone compound packed layer (3) ot-yet-hardened in described stake holes time insert cage type framework (4), the insertion time of whole cage type framework (4) is no more than 30 minutes; After cage type framework (4) inserts, moving long spiral drilling machine, to the construction of next position, hole, when processing soft stratum, easily being altered hole phenomenon, should be constructed every hole;
Step 4) after the cement, flyash and crushed stone compound intensity in stake holes reaches 80% of age strength, cut pile crown to design elevation, namely form required rear slotting reinforcing cage CFG;
Step 5) carry out detection of construction quality after pile, after having constructed 28 days, the frequency by 0.2% carries out Single pile static load test and boring and coring detects, and evaluates strengthening quality, carries out low strain dynamic dynamic test detection pile integrity by the frequency of 10% simultaneously;
In described step 3, when the length of cage type framework (4) is 4 ~ 6m, plank is fixed at the top of cage type framework (4), adopt the pressure plank of 4000 ~ 6000KN, cage type framework (4) is inserted in cement, flyash and crushed stone compound packed layer (3), presses down in process and control the verticality of cage type framework (4) well;
Cement in described cement, flyash and crushed stone compound packed layer (3): flyash: sand: rubble: Admixture: the ratio of water is 190:118:823:1091:3.08:178;
In described cement, flyash and crushed stone compound packed layer (3), the slump of cement, flyash and crushed stone compound is 180mm ~ 200mm;
In described step 3, as the length < 4m of cage type framework (4), adopt the pressure cage type framework (4) of 1300 ~ 1600KN, and ensure the verticality of cage type framework (4), after in cage type framework (4) insertion cement, flyash and crushed stone compound packed layer (3) more than 3m, back and forth by cage type framework (4) handling 30cm, then adjust verticality and transfer cage type framework (4);
In described step 3, when the length of cage type framework (4) is greater than 6m, by plate vibration inserter (6), cage type framework (4) is inserted in cement, flyash and crushed stone compound packed layer (3), described plate vibration inserter (6) comprises plate vibrator (6.1), top board (6.2), the card tip (6.3) and steel pipe (6.4), wherein, top board (6.2) is fixedly connected with plate vibrator (6.1), one end of described steel pipe (6.4) is fixedly connected with top board (6.2); Steel pipe (6.4) is placed in cage type framework (4), and be fixedly connected with cage type framework (4) by the card tip (6.3), described top board (6.2) is placed in the top of cage type framework (4), the other end of described steel pipe (6.4) is pyramidal structure, the other end of steel pipe (6.4) is fixedly connected with the bottom of cage type framework (4), utilize the power of impulsing of plate vibration inserter (6) to transfer cage type framework (4) to projected depth, the exciting force of described plate vibration inserter (6) is 9 ~ 16KN; The non-loaded amplitude of plate vibration inserter (6) is 0.4 ~ 1.0mm; The 50-100HZ frequently that shakes of plate vibration inserter (6);
Under standard curing condition, cube strength should reach C20 standard to cement, flyash and crushed stone compound packed layer (3) the 28 day length of time.
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| CN103243709B (en) * | 2013-05-20 | 2015-01-07 | 马春根 | Fast noise-free inserting construction method for super long reinforcement cage |
| CN107130590B (en) * | 2017-06-26 | 2022-04-22 | 中国核工业第二二建设有限公司 | Device for accurately inserting reinforcing steel bars into plain concrete pile and construction method |
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| CN1370893A (en) * | 2002-04-04 | 2002-09-25 | 中国建筑科学研究院 | Pile end mortar pre-pressing construction method and apparatus for long screw auger drilling deposited pile and CFG pile |
| CN1648353A (en) * | 2004-01-19 | 2005-08-03 | 北京市机械施工公司 | Concrete transplanting steel bar cage pile forming technical method of long screw hole drilling and center pump pressure |
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