CN102619218A - Back-insert steel reinforcement cage cement-flyash-gravel pile and pile-forming method thereof - Google Patents
Back-insert steel reinforcement cage cement-flyash-gravel pile and pile-forming method thereof Download PDFInfo
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- CN102619218A CN102619218A CN2012101162818A CN201210116281A CN102619218A CN 102619218 A CN102619218 A CN 102619218A CN 2012101162818 A CN2012101162818 A CN 2012101162818A CN 201210116281 A CN201210116281 A CN 201210116281A CN 102619218 A CN102619218 A CN 102619218A
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Abstract
The invention discloses a back-insert steel reinforcement cage cement-flyash-gravel pile. The back-insert steel reinforcement cage cement-flyash-gravel pile comprises a cement-flyash-gravel mixture filled layer, and is characterized by comprising a cage-shaped framework which is mainly formed by fixedly connecting a plurality of main bars with hoopings, and the cement-flyash-gravel mixture filled layer is densely filled in the cage-shaped framework, extends and is covered on the periphery of the cage-shaped framework. According to the back-insert steel reinforcement cage cement-flyash-gravel pile disclosed by the invention, the cage-shaped framework is arranged in the cement-flyash-gravel mixture filled layer, so that the back-insert steel reinforcement cage cement-flyash-gravel pile disclosed by the invention can be used for reinforcement treatment of high-speed railway foundations, such as slope foundations, semi-filled and semi-excavated foundations, mucky soil layers and the like, which are easy to produce greater horizontal force and very strict to control sedimentation after working, greatly enhance the horizontal shearing strength of the cement-flyash-gravel pile composite foundations and ensure that the sedimentation and the stability of the high-speed railway foundations can meet the requirements. In addition, the back-insert steel reinforcement cage cement-flyash-gravel pile disclosed by the invention has obvious social effects and economic benefits. Compared with a small drilled pile (the diameter is 60cm), the cost of the back-insert steel reinforcement cage cement-flyash-gravel pile can be saved by nearly 1/3 under the same conditions.
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 back and insert reinforcing cage CFG and piling method thereof.
Technical background
The high-speed railway subgrade engineering requires high to sedimentation especially differential settlement; For the slope ground, partly fill out soft foundations such as partly digging ground and mud, mucky soil and adopt treatment technologies such as bored pile, pile tube owing to being prone to produce bigger horizontal force, processing cost is high.CFG is handled means as a kind of composite foundation of routine; Because of its easy construction, easy to control the quality, the lower extensively utilization in railway engineering of cost, but receive influence of various factors that quality problems often take place when soft foundations such as processing mud, mucky soil.
Summary of the invention
The objective of the invention is to above-mentioned technical problem; Provide a kind of back to insert reinforcing cage CFG and piling method thereof; This method can keep its fastening strength when soft foundations such as slope ground, mud, mucky soil are carried out consolidation process, and cost is relatively low.
For realizing this purpose; The back slotting reinforcing cage CFG that the present invention designed; Comprise cement, flyash and crushed stone compound packed layer; It is characterized in that: it also comprises mainly and is fixedly connected the cage type framework that constitutes with stirrup by some main muscle, and said cement, flyash and crushed stone compound packed layer is closely knit, and to be filled in the cage type framework inner and extend and cover cage type framework periphery.
Length >=the 6m of said cage type framework; The bottom of said cage type framework is a conical mount; Be provided with some radially stiffeners in the said cage type framework; Said some radially stiffeners form the radially inner headspace of reinforcing bar in the cage type framework, the inner headspace of said radially reinforcing bar is positioned at the center of cage type framework.
Length >=the 12m of said cage type framework, the middle part of said cage type framework is fixedly connected with locator.
Maximum particle diameter≤the 2cm of said cement, flyash and crushed stone compound packed layer medium stone.
The piling method of reinforcing cage CFG is inserted in above-mentioned back, and it comprises the steps:
Step 1) gets out a hole at high-speed railway slope ground or soft foundation position to be reinforced;
Step 2) in said stake hole, pours into the cement, flyash and crushed stone compound, form cement, flyash and crushed stone compound packed layer;
Insert the cage type framework during cement, flyash and crushed stone compound packed layer ot-yet-hardened of step 3) in said stake hole, the insertion time of whole cage type framework is no more than 30 minutes;
Step 4) treat the cement, flyash and crushed stone compound intensity in the hole reach age strength 80% after, cut pile crown to design elevation, promptly form required back and insert the reinforcing cage CFG.
In the said step 3; When the length of cage type framework＜4m; Adopt the pressure of 1300～1600KN to press down the cage type framework, and guarantee the verticality of cage type framework, after surpassing 3m in the cage type framework insertion cement, flyash and crushed stone compound packed layer; With about cage type framework handling 30cm, adjust verticality again and transfer the cage type framework back and forth.
In the said step 3; When the length of cage type framework was 4～6m, the fixing plank at the top of cage type framework adopted pressing plank under the pressure of 4000～6000KN; The cage type framework is inserted in the cement, flyash and crushed stone compound packed layer, press down and control the verticality of cage type framework in the process well.
In the said step 3; When the length of cage type framework during greater than 6m; Through the plate vibration inserter cage type framework is inserted in the cement, flyash and crushed stone compound packed layer, said plate vibration inserter comprises plate vibrator, top board, the card tip and steel pipe, wherein; Be fixedly connected plate vibrator on the top board, an end of said steel pipe is fixedly connected with top board; Steel pipe places in the cage type framework, and is connected with the cage type frame fixation through the card tip, and said top board places the top of cage type framework, and the other end of said steel pipe is a pyramidal structure, and the other end of steel pipe is fixedly connected with the bottom of cage type framework.
Cement in the said cement, flyash and crushed stone compound packed layer: flyash: sand: rubble: Admixture: the ratio of water is 190: 118: 823: 1091: 3.08: 178.
The slump of cement, flyash and crushed stone compound is 180mm～200mm in the said cement, flyash and crushed stone compound packed layer.
The present invention is through being provided with the cage type framework in cement, flyash and crushed stone compound packed layer; Make the present invention can be used for the slope ground, partly fill out the bigger horizontal forces of easy generation such as partly digging ground and mud, silt soil strata and settlement after construction is controlled the consolidation process of very strict high-speed railway ground; Strengthen the horizontal shear strength of CFG composite foundation greatly, guaranteed the sedimentation and stable the meeting the demands of high-speed railway subgrade.In addition, the present invention has obvious social and economic benefit.Under the same terms, the back is inserted the reinforcing cage CFG and is compared cost savings nearly 1/3 with small bore stake (diameter 60cm).
The relative ordinary Portland cement flyash of the present invention broken stone pile has following advantage on the whole:
(1) pile body top bulk strength increases.The relative ordinary Portland cement flyash of reinforcing cage CFG broken stone pile is inserted in the back, and because of top is inserted with reinforcing cage, the intensity of stake is taken on a new look greatly, and globality is better.
(2) the horizontal shear resistance of pile body strengthens
The stake of reinforcing cage CFG is inserted after inserting reinforcing cage in the back, and pile body upper level shear resistance strengthens, and is more suitable in the bigger ground of horizontal shears such as slope ground is handled.
Description of drawings
Fig. 1 is a 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 when the length of cage type framework 4 >=6m among the present invention;
Fig. 4 is that the A-A of Fig. 3 is to sectional view;
Fig. 5 is the structural representation when the length of cage type framework 4 >=12m among the present invention;
Fig. 6 inserts the structural representation of cage type framework for middle plateform vibration inserter of the present invention;
Wherein, 1-master's muscle, 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, 7-stiffener, 8-conical mount, the 9-inner headspace of reinforcing bar radially radially.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed description:
Back slotting reinforcing cage CFG as shown in the figure; Comprise cement, flyash and crushed stone compound packed layer 3; It also comprises mainly and is fixedly connected the cage type framework 4 that constitutes with stirrup 2 by some main muscle 1, and cement, flyash and crushed stone compound packed layer 3 is closely knit, and to be filled in cage type framework 4 inner and extend and cover cage type framework 4 peripheries.Above-mentioned cage type framework 4 is a reinforcing cage.
In the technique scheme; Length >=6m when cage type framework 4; The bottom design of this cage type framework 4 is a conical mount 8; Be provided with some radially stiffeners 7 in the said cage type framework 4, some radially stiffeners 7 form the radially inner headspace 9 of reinforcing bar in cage type framework 4, and the inner headspace 9 of said radially reinforcing bar is positioned at the center of cage type framework 4.Can make reinforcing cage cage body top in the process of transferring, bottom stressed evenly through improving the reinforcing cage structure, transfer smoothly, and cage body and pile body do not have destruction.The inner headspace 9 of said radially reinforcing bar makes things convenient for the steel pipe insertion 6.4 and the centering of plate vibration inserter 6.
In the technique scheme, when the length of cage type framework 4 >=12m, the centering control difficulty comparatively in the process is transferred in stake, and being employed in the outside, cage type framework 4 middle parts, to add the directed support of weldering ear shape be locator 5.Weld side by side after above-mentioned locator 5 adopts 2 Φ 16 bar bendings, bending height is 5cm.Hoop evenly welds 4 for every group, and every 3m welds one group.
In the technique scheme, the maximum particle diameter≤2cm of said cement, flyash and crushed stone compound packed layer 3 medium stones.The too little pile body structural requirement that can not satisfy CFG of the maximum particle diameter of above-mentioned rubble too greatly then causes cage type framework 4 to transfer difficulty easily.In the uniformity because of the too big extruding mutually of ballast grain sizes back destructible material of body of a pile of transferring in the process of cage type framework 4, the coarse-fine aggregate segregation is serious in addition.
The piling method of reinforcing cage CFG is inserted in above-mentioned back, and it comprises the steps:
Step 1) gets out a hole at high-speed railway slope ground or soft foundation position to be reinforced;
Step 2) in said stake hole, pours into the cement, flyash and crushed stone compound, form cement, flyash and crushed stone compound packed layer 3;
Insert cage type framework 4 during cement, flyash and crushed stone compound packed layer 3 ot-yet-hardeneds of step 3) in said stake hole; Generally be controlled at cement, flyash and crushed stone compound packed layer 3 and send into behind the hole and begin to insert cage type framework 4 in 5 minutes, the insertion time of whole cage type framework 4 is no more than 30 minutes; After cage type framework 4 inserted and finishes, the moving long spiral drilling machine was to next position, hole construction.When handling soft stratum, scurry the hole phenomenon easily, should be at a distance from the hole construction.
Step 4) treat the cement, flyash and crushed stone compound intensity in the hole reach age strength 80% after, cut pile crown to design elevation, promptly form required back and insert the reinforcing cage CFG.Similar with castinplace pile, in order to ensure the intensity on stake top, generally all can be called empty stake than the long 0.2～0.5m of designing pile length, need to adopt manual work or plant equipment to cut behind the pile.
Carrying out construction quality behind the step 5) pile detects.Construction was accomplished after 28 days, and the frequency by 0.2% carries out the single pile load test and boring and coring detects, and strengthening quality is estimated.Hang down the integrality that the stress drive test detects stake by 10% the frequency simultaneously.
In the technique scheme, cement, flyash and crushed stone compound packed layer 3 under the standard curing condition the 28 day length of time cube (150mm * 150mm * 150mm) intensity should reach the C20 standard.
In the said step 3; When the length of cage type framework 4＜4m; Use the artificial mode that presses down to adopt the pressure of 1300～1600KN to press down cage type framework 4, and guarantee the verticality of cage type framework 4, after surpassing 3m in the cage type framework 4 insertion cement, flyash and crushed stone compound packed layers 3; With about cage type framework 4 handling 30cm, adjust verticality again and transfer cage type framework 4 back and forth.
In the said step 3; When the length of cage type framework 4 is 4～6m; The fixing plank at the top of cage type framework 4; The mode of using machine to press down adopts pressing plank under the pressure of 4000～6000KN, and cage type framework 4 is inserted in the cement, flyash and crushed stone compound packed layers 3, presses down to control the verticality of cage type framework 4 in the process well.The control downforce guarantees that reinforcing cage is indeformable in pressing down.
The too small meeting of above-mentioned downforce makes reinforcing cage to press down and puts in place that downforce is crossed conference and caused the reinforcing cage distortion.
In the above-mentioned steps 3; When the length of cage type framework 4 during greater than 6m; Through plate vibration inserter 6 cage type framework 4 is inserted in the 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; Be fixedly connected plate vibrator 6.1 on the top board 6.2, an end of steel pipe 6.4 is fixedly connected with top board 6.2; Steel pipe 6.4 places in the cage type framework 4, and is fixedly connected with cage type framework 4 through the card tip 6.3, and top board 6.2 places the top of cage type framework 4, and the other end of steel pipe 6.4 is a pyramidal structure, and 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.Recommend according to field trial: exciting force 9-16KN; Non-loaded amplitude 0.4-1.0 (MMM); 50-100 (HZ) frequently shakes.
In the technique scheme; The reinforcing cage CFG is inserted owing to insert the particularity of reinforcing cage thereafter in the back; Match ratio to the material of body of a pile mix requires high; For guaranteeing that strength of the mixing pile reaches the C20 standard,, need selected rational CFG stake (CFG) material of body of a pile match ratio simultaneously for the smooth insertion of follow-up reinforcing cage.Cement in the 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 the technique scheme,, be to guarantee the smooth insertion of reinforcing cage, must control concrete workability well owing to also will insert reinforcing cage after in the compound fill orifice.The slump of cement, flyash and crushed stone compound is 180mm～200mm in the said cement, flyash and crushed stone compound packed layer 3.
The content that this manual is not done to describe in detail belongs to this area professional and technical personnel's known prior art.
Claims (10)
1. insert the reinforcing cage CFG after one kind; Comprise cement, flyash and crushed stone compound packed layer (3); It is characterized in that: it also comprises mainly by some main muscle (1) and is fixedly connected the cage type framework (4) that constitutes with stirrup (2), and said cement, flyash and crushed stone compound packed layer (3) is closely knit, and to be filled in cage type framework (4) inner and extend and cover cage type framework (4) periphery.
2. the reinforcing cage CFG is inserted in back according to claim 1; It is characterized in that: the length >=6m of said cage type framework (4); The bottom of said cage type framework (4) is conical mount (8); Be provided with some radially stiffeners (7) in the said cage type framework (4), said some radially stiffeners (7) form the radially inner headspace (9) of reinforcing bar in cage type framework (4), and the inner headspace of said radially reinforcing bar (9) is positioned at the center of cage type framework (4).
3. the reinforcing cage CFG is inserted in back according to claim 1 and 2, and it is characterized in that: the length >=12m of said cage type framework (4), the middle part of said cage type framework (4) is fixedly connected with locator (5).
4. the reinforcing cage CFG is inserted in back according to claim 3, it is characterized in that: the maximum particle diameter≤2cm of said cement, flyash and crushed stone compound packed layer (3) medium stone.
5. insert the piling method of reinforcing cage CFG like the said back of claim 4 for one kind, it comprises the steps:
Step 1) gets out a hole at high-speed railway slope ground or soft foundation position to be reinforced;
Step 2) in said stake hole, pours into the cement, flyash and crushed stone compound, form cement, flyash and crushed stone compound packed layer (3);
Insert cage type framework (4) during cement, flyash and crushed stone compound packed layer (3) ot-yet-hardened of step 3) in said stake hole, the insertion time of whole cage type framework (4) is no more than 30 minutes;
Step 4) treat the cement, flyash and crushed stone compound intensity in the hole reach age strength 80% after, cut pile crown to design elevation, promptly form required back and insert the reinforcing cage CFG.
6. the piling method of reinforcing cage CFG is inserted in back according to claim 5; It is characterized in that: in the said step 3, when the length of cage type framework (4)＜4m, adopt the pressure of 1300～1600KN to press down cage type framework (4); And the verticality of assurance cage type framework (4); After in cage type framework (4) inserts cement, flyash and crushed stone compound packed layer (3), surpassing 3m, with about cage type framework (4) handling 30cm, adjust verticality again and transfer cage type framework (4) back and forth.
7. the piling method of reinforcing cage CFG is inserted in back according to claim 5; It is characterized in that: in the said step 3; When the length of cage type framework (4) was 4～6m, the fixing plank at the top of cage type framework (4) adopted pressing plank under the pressure of 4000～6000KN; Cage type framework (4) is inserted in the cement, flyash and crushed stone compound packed layer (3), press down and control the verticality of cage type framework (4) in the process well.
8. the piling method of reinforcing cage CFG is inserted in back according to claim 5; It is characterized in that: in the said step 3; When the length of cage type framework (4) during greater than 6m; Through plate vibration inserter (6) cage type framework (4) is inserted in the cement, flyash and crushed stone compound packed layer (3), said 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 gone up and is fixedly connected plate vibrator (6.1), and an end of said steel pipe (6.4) is fixedly connected with top board (6.2); Steel pipe (6.4) places in the cage type framework (4); And through the card tip (6.3) be fixedly connected with cage type framework (4); Said top board (6.2) places the top of cage type framework (4), and the other end of said steel pipe (6.4) is a pyramidal structure, and the other end of steel pipe (6.4) is fixedly connected with the bottom of cage type framework (4).
9. the piling method of reinforcing cage CFG is inserted in back according to claim 5, it is characterized in that: cement in the said 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.
10. the piling method of reinforcing cage CFG is inserted in back according to claim 5, it is characterized in that: the slump of cement, flyash and crushed stone compound is 180mm～200mm in the said cement, flyash and crushed stone compound packed layer (3).
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| CN201210116281.8A CN102619218B (en) | 2012-04-19 | 2012-04-19 | Rear slotting reinforcing cage CFG and piling method thereof |
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Cited By (2)
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| CN103243709A (en) * | 2013-05-20 | 2013-08-14 | 马春根 | Fast noise-free inserting construction method for super long reinforcement cage |
| CN107130590A (en) * | 2017-06-26 | 2017-09-05 | 中国核工业第二二建设有限公司 | A kind of device and construction method that reinforcing bar is properly inserted to plain concrete pile |
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| CN102619218B (en) | 2015-09-30 |
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