CN101608448B - Pile-forming method for cement paste spraying multi-directional core entraining mixing pile - Google Patents
Pile-forming method for cement paste spraying multi-directional core entraining mixing pile Download PDFInfo
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Abstract
The invention provides a pile-forming method for a cement paste spraying multi-directional core entraining mixing pile, which is characterized in that (1) a mixing pile machine is in position and leveled, and a bit aims at a pile position; (2) a drill pipe downward stirs and cuts soil along a guide frame until the designed depth; (3) after the drill pipe reaches the predetermined design depth, concrete are locally and continuously sprayed and stirred at the tip of the pile for more than 10 to 30 seconds; (4) the drill pipe is lifted; (5) concrete spraying is carried out while stirring; the drill pipe is lifted to the surface of earth or the designed elevation to finish the construction of a signal multi-directional mixing pile; (6) the tip of the pile of a core pile passes through a central hole of a jacking pile platform and is inserted into the center of the finished multi-directional mixing pile; (7) after the core pile sinks by self-weight and is penetrated into a certain depth ofthe mixing pile, the core pile is collated along two directions and the verticality of the core pile is regulated; the core pile is continuously sunken without any unmistakable; and (8) the core pileis pressed by hydraulic static force until the designed appointed depth. The method can realize the synchronous implementation of the mixing pile and the core pile operation, has high working efficiency, convenient construction, and low construction noise; the stress of the pile body is more reasonable and the pile shaft has high strength.
Description
Technical field
The present invention relates to a kind of construction foundation working process, particularly relate to the cement mortar spraying multi-directional core mixing pile piling method in the Soft Ground.
Background technology
At the reinforcement of soft soil problem, China Ministry of Metallurgical Industry, build and grind institute and propose to stir deeply processing mode in the seventies.The eighties, the unidirectional cement-soil mixing pile machine of single shaft (being commonly called as pile dusting machine) of the common exploitation of the 4th surveying and designing institute of the Ministry of Railways and Wuhan engineering machinery research institute is succeedd in reinforcement of soft soil, obtains many-sided identification.For many years, cement mixing method in application because of reasons such as apparatus and process and stratum, pile quality is wayward, often do not reach designing requirement, many accidents resulting from poor quality of projects have taken place, cause people that quality, reinforcement depth, the consolidation effect of cement mixing method have been produced suspection, influenced the application of cement mixing method.
Number of patent application is 200810197379.4 multi-direction multi-shaft stirring concrete earth pile machine, multidirectional stirring technique has been proposed, stir though reached, do not emit slurry, the purpose that work efficiency is high, but its shortcoming is a cement earth pile to be improved limited to weak soil layer intensity, pile strength is low, can not reach speedway, the requirement of railway bed treatment of soft foundation, the particularly requirement of high-speed railway settlement after construction (near zero sedimentation), if adopt the CFG stake, preformed pile, rigid pile such as castinplace pile are handled, when the very major part of pile shaft material intensity is not brought into play as yet, the pile soil horizon bearing capacity that reached capacity, cause the waste of pile shaft material, and pile crown must do pile cover, otherwise the destruction of thrusting is upwards taken place easily, it is loaded down with trivial details to construct, very uneconomical.
Number of patent application is 02275785.6 the concrete-cored deep cement mixing pile that adds, is before the cement mixing method initial set, to be pressed into pre-rounding wedge shape or the stake of square wedge shape concrete core, or the stake of strike-on concrete spouting core, form core mixing pile.The utility model according to scientific research and testing core stake parameter is, the ratio of core stake top cross-sectional area and agitation pile cross-sectional area is 0.15～0.80, the ratio of core pile length and agitation pile length is 0.35～0.9, the ratio of core stake lateral area and agitation pile lateral area is greater than 0.18.Different with traditional various stakes, it has design adjustability, bearing capacity ambiguity characteristics, and its key technology is core stake design.This core mixing pile improves 1～5 times of bearing capacity than conventional agitation pile, even is higher than castinplace pile more than 15%, makes workmanship and safety obtain reliable guarantee.Under the comparable prerequisite of service condition, bigger reduction pile foundation engineering cost.This patent has proposed to add the core stake, adds the difficult point that the core stake becomes foundation construction but how to make things convenient for to make.
Under flexible load conditions such as highway, railway treatment of soft foundation, seek a kind of foundation treatment mode of technical feasible, economical rationality, particularly important under the condition of greatly developing high-speed railway at present.
Summary of the invention
The purpose of this invention is to provide a kind of cement mortar spraying multi-directional core mixing pile piling method, can realize that agitation pile and core stake operation carry out synchronously, increase work efficiency greatly, easy construction, pile body is stressed more to become rationally the pile strength height.
In order to achieve the above object, cement mortar spraying multi-directional core mixing pile piling method of the present invention is characterized in that:
1., with in place, the leveling of multidirectional core mixing pile machine, drill bit stake position;
2., start mixer, its drilling rod is stirred downwards along leading truck cuts soil, open simultaneously and send stock pump to soil body spraying cement mortar, the simultaneously forward and reverse rotation of bit blades is stirred up to projected depth;
3., reach the predetermined design degree of depth after, continue whitewashing on the spot at the stake end and stir more than 10～30 seconds, stake end cement mortar and soil are stirred;
4., promote drilling rod, simultaneously, send stock pump to continue to soil body spraying cement mortar, the forward and reverse rotation of bit blades continues to stir cement-soil, the purpose of whitewashing this moment is blocked for fear of mouth spray;
5., whitewashing while stirring, promote drilling rod to the face of land or design elevation, finish the construction of single multidirectional agitation pile;
6., start hoist engine, utilize the knot that can be undone by a pull lifting of steel cable end to play the core stake, the stake point of core stake passes the centre bore of piling platform, inserts completed multidirectional agitation pile center;
7., the core stake in deadweight sinking injection agitation pile behind the certain depth, check and adjust the verticality of core stake along both direction, confirms errorless back continuation core sag;
8., when the core stake can not be sunk under the effect of deadweight, the after top dead center of oil cylinder will be moved on the piling platform, the manipulation oil cylinder is descending, clamper is started working, firmly with the core pile holder tight in, the piling platform continues to come downwards to the lower dead center of oil cylinder, so repeatedly, until the core stake is continued to press to the design designated depth, finish the construction of multidirectional core mixing pile, the piling platform is hydraulic pressure piling platform or vibration piling platform.
Described multidirectional core mixing pile is multidirectional short core agitation pile or multidirectional long core agitation pile.
Described multidirectional core mixing pile is column core mixing pile or T shape core mixing pile.
Described core stake is single-unit or more piece, adopts welding between the stake of more piece core, rivets or is threaded.
Because agitation pile and add core construction and realize carrying out synchronously, high efficiency, easy construction; Add core and adopt hydraulic pressure to press core, it is little to add core stake noise than vibrating type or paddle type mill, and the impact force that core stake simultaneously is subjected to is little, is not easy to produce the phenomenon that fractures, and the stress of core stake also improves, and pile body is stressed more to become rationally the pile strength height.
This cement mortar spraying multi-directional core mixing pile piling method also is applicable to the construction of mortar spraying multi-directional core mixing pile.
Cement mortar spraying multi-directional core mixing pile piling method of the present invention, can realize that agitation pile and core stake operation carry out synchronously, can be according to upper load and geological condition, adopt construction technologies such as short core, long core, cylindricality core, the stake of T core flexibly, high efficiency, easy construction, construction noise is little, pile body is stressed more to become rationally, the pile strength height, and the engineering construction cost is low.
Description of drawings
Fig. 1 is the drill bit stake position view of the embodiment of the invention.
Fig. 2 stirs downwards to cut earthy attitude schematic diagram.
Fig. 3 finishes downward stirring to cut earthy attitude schematic diagram.
Fig. 4 promotes the drilling rod view.
Fig. 5 finishes multidirectional agitation pile view.
Fig. 6 is that lifting plays core stake view.
Fig. 7 is that the core stake is in deadweight sinking injection agitation pile view.
Fig. 8 is a core sag stake view under the hydraulic static.
Fig. 9 finishes multidirectional core mixing pile construction view.
Figure 10 is the multidirectional mixing pile construction schematic diagram of T shape.
Figure 11 is that T shape adds the multidirectional agitation pile schematic diagram of core.
Figure 12 is the multidirectional agitation pile schematic diagram of long core.
Figure 13 is the multidirectional agitation pile schematic diagram of the long core of T shape.
The specific embodiment
Fig. 1 description of symbols: drill bit 1, drilling rod 2, bit blades 3.
Fig. 6 description of symbols: core stake 4.
The embodiment construction sequence of cement mortar spraying multi-directional core mixing pile piling method of the present invention is as follows:
1., with in place, the leveling of multidirectional core mixing pile machine, drill bit 1 align piles position (as Fig. 1);
2., start mixer, its drilling rod 2 is stirred downwards along leading truck cuts soil (as Fig. 2), open simultaneously and send stock pump to soil body spraying cement mortar, the slurry amount is 90% of total slurry amount, bit blades 3 simultaneously forward and reverse rotations are stirred up to projected depth;
3., reach the predetermined design degree of depth after, continue whitewashing on the spot at the stake end and stir more than 10～30 seconds (as Fig. 3), stake end cement mortar and soil are stirred;
4., promote drilling rod 2, simultaneously, send stock pump to continue to soil body spraying cement mortar, the slurry amount is 10% of total slurry amount, bit blades 3 forward and reverse rotations continue stirring concrete earth (as Fig. 4), the purpose of whitewashing this moment is blocked for fear of mouth spray;
5., whitewashing while stirring, promote drilling rod 2 to the face of land or design elevation, finish the construction (as Fig. 5) of single multidirectional agitation pile;
6., start hoist engine, utilize the knot that can be undone by a pull lifting of steel cable end to play core stake 4, the stake point of core stake 4 passes the centre bore of piling platform, inserts completed multidirectional agitation pile center (as Fig. 6);
7., core stake 4 in deadweight sinking injection agitation pile behind the certain depth, check and adjust the verticality of core stake 4 along both direction, confirms errorless back continuation core sag (as Fig. 7);
8., when core stake 4 can not be sunk under the effect of deadweight, the after top dead center of oil cylinder will be moved on the hydraulic pressure piling platform, the manipulation oil cylinder is descending, and clamper is started working, when firmly core stake 4 being clamped, the piling platform continues to come downwards to the lower dead center (as Fig. 8) of oil cylinder, so repeatedly, until core stake 4 is continued to press to the design designated depth, finish the construction (as Fig. 9) of multidirectional core mixing pile, the piling platform can be a hydraulic pressure piling platform, also can be with vibrating the piling platform.
Multidirectional core mixing pile is multidirectional short core agitation pile or multidirectional long core agitation pile, is multidirectional short core agitation pile in the present embodiment.Multidirectional long core mixing pile construction is adopted the vibration sinking tube instillation process.
Multidirectional core mixing pile is column core mixing pile or T shape core mixing pile, is the column core mixing pile in the present embodiment.To T shape core mixing pile, in lifting process, have one to stir the reaming operation.
Core stake 4 is single-unit or more piece, adopts between the stake of more piece core to be welded to connect, and in the present embodiment stake of more piece core.
Because agitation pile and add core construction and realize carrying out synchronously, high efficiency, easy construction; Add core and adopt hydraulic pressure to press core, it is little to add core stake 4 noises than vibrating type or paddle type mill, and the impact force that core stake 4 simultaneously is subjected to is little, is not easy to produce the phenomenon that fractures, and the stress of core stake 4 also improves, and pile body is stressed more to become rationally the pile strength height.
In work progress, should determine the bearing capacity of single pile and the Bearing Capacity of Composite Foundation of cement mortar spraying multi-directional core mixing pile according to designing requirement and geological conditions, select that reasonably stake is long, stake footpath, cross sectional shape and area replacement ratio.
Carry out 20m when handling, should preferentially select short core agitation pile for use, generally adopt the stake of prefabricated reinforced concrete variable cross-section core with interior shallow layer foundation; When carrying out handling, should preferentially select long core agitation pile for use, generally adopt the stake of immersed tube bored cast-in-situ steel reinforced concrete uniform section core greater than the 20m deep foundation.
The stake footpath of multidirectional core mixing pile is generally 500mm, and pile spacing should be got 1.3～2.0m, road and bridge (road tunnel) changeover portion, culvert ground handle and should get the small value or encrypt.Core stake 4 is preferably down the square or truncated cone-shaped of cubic terrace with edge, and tip section should not be less than 200 * 200mm, and following end section should not be less than 100 * 100mm; The square column type cross section should not be less than 150 * 150mm; Cylindrical, tubular diameter should not be less than 200mm.Multidirectional when adding core T shape agitation pile when adopting, agitation pile enlarged footing diameter is generally 800mm～1000mm, the enlarged footing height generally be not more than stake long 1/4 (commonly used 1～3m).T core pile enlarged foot diameter is generally 400mm～600mm, and the enlarged footing height generally lacks 300mm～500mm than agitation pile enlarged footing height.
This cement mortar spraying multi-directional core mixing pile piling method also is applicable to the construction of mortar spraying multi-directional core mixing pile.
Cement mortar spraying multi-directional core mixing pile piling method of the present invention can realize that agitation pile and core stake 4 operations carry out synchronously; Adopt T shape core mixing pile, do not need to design pile cover, can increase pile spacing, save construction investment; High efficiency, easy construction, construction noise is little, and pile body is stressed more to become rationally, and the pile strength height can replace CFG stake, pile for prestressed pipe under certain condition; The economic benefit height saves 30～50% than CFG stake, pile tube comprehensive cost.
Claims (4)
1. cement mortar spraying multi-directional core mixing pile piling method is characterized in that:
1., with in place, the leveling of multidirectional core mixing pile machine, drill bit stake position;
2., start mixer, its drilling rod is stirred downwards along leading truck cuts soil, open simultaneously and send stock pump to soil body spraying cement mortar, the simultaneously forward and reverse rotation of bit blades is stirred up to projected depth;
3., reach the predetermined design degree of depth after, continue whitewashing on the spot at the stake end and stir more than 10 seconds, stake end cement mortar and soil are stirred;
4., promote drilling rod, simultaneously, send stock pump to continue to soil body spraying cement mortar, the forward and reverse rotation of bit blades continues stirring concrete earth;
5., whitewashing while stirring, promote drilling rod to the face of land or design elevation, finish the construction of single multidirectional agitation pile;
6., start hoist engine, utilize the knot that can be undone by a pull lifting of steel cable end to play the core stake, the stake point of core stake passes the centre bore of piling platform, inserts completed multidirectional agitation pile center;
7., the core stake in deadweight sinking injection agitation pile behind the certain depth, check and adjust the verticality of core stake along both direction, confirms errorless back continuation core sag;
8., when the core stake can not be sunk under the effect of deadweight, the after top dead center of oil cylinder will be moved on the piling platform, the manipulation oil cylinder is descending, clamper is started working, firmly with the core pile holder tight in, the piling platform continues to come downwards to the lower dead center of oil cylinder, so repeatedly, until the core stake is continued to press to the design designated depth, finish the construction of multidirectional core mixing pile, the piling platform is hydraulic pressure piling platform or vibration piling platform.
2. cement mortar spraying multi-directional core mixing pile piling method according to claim 1 is characterized in that: multidirectional core mixing pile is multidirectional short core agitation pile or multidirectional long core agitation pile.
3. cement mortar spraying multi-directional core mixing pile piling method according to claim 1 is characterized in that: multidirectional core mixing pile is column core mixing pile or T shape core mixing pile.
4. cement mortar spraying multi-directional core mixing pile piling method according to claim 1, it is characterized in that: the core stake is single-unit or more piece, adopts welding between the stake of more piece core, rivets or is threaded.
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| CN2009100633408A CN101608448B (en) | 2009-07-28 | 2009-07-28 | Pile-forming method for cement paste spraying multi-directional core entraining mixing pile |
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| CN101608448B true CN101608448B (en) | 2011-06-15 |
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| CN104032730A (en) * | 2014-04-29 | 2014-09-10 | 周兆弟 | Triangular plum-blossom-shaped shaped drilling pile and forming method thereof |
| CN104088274A (en) * | 2014-04-29 | 2014-10-08 | 周兆弟 | Quincunx drilling pile and forming method |
| CN104032735B (en) * | 2014-04-29 | 2016-09-28 | 周兆弟 | Triangle Flos Mume cement mixing method and manufacturing process |
| CN104878738A (en) * | 2015-06-02 | 2015-09-02 | 中铁第四勘察设计院集团有限公司 | Subgrade reinforcement structure for pond in deep soft soil area and construction method for subgrade reinforcement structure |
| CN105256795B (en) * | 2015-10-21 | 2017-07-14 | 江国华 | Hold type thread core built pile and its construction equipment and construction method in a kind of end |
| CN105625294A (en) * | 2016-02-05 | 2016-06-01 | 王继忠 | Composite foundation and construction method thereof |
| CN107044120A (en) * | 2017-04-20 | 2017-08-15 | 武汉谦诚桩工科技股份有限公司 | A kind of major diameter ultra deep stirs spray stiff composite pile and its construction method |
| CN108797629A (en) * | 2018-06-07 | 2018-11-13 | 北京星河园林景观工程有限公司 | A kind of construction method that highway bridge and culvert both sides are soft soil roadbed |
| CN108868590B (en) * | 2018-08-16 | 2023-12-08 | 北京城建勘测设计研究院有限责任公司 | Single-shaft cement-soil mixing pile drill bit |
| CN109056711B (en) * | 2018-08-31 | 2020-09-22 | 河海大学 | Nail-shaped stiffening core pile and construction method thereof |
| CN109235429A (en) * | 2018-10-12 | 2019-01-18 | 中铁六局集团有限公司 | A kind of multidirectional concrete-cored mortar mixing pile construction engineering method of marine facies geology |
| CN111364454A (en) * | 2020-03-30 | 2020-07-03 | 东南大学 | Construction method of variable cross-section composite pile |
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Application publication date: 20091223 Assignee: Wuhan fibercom Construction Group Co. Ltd. Assignor: Wuhan High Iron Pickets Work Technology Co.,Ltd. Contract record no.: 2014420000083 Denomination of invention: Pile-forming method for cement paste spraying multi-directional core entraining mixing pile Granted publication date: 20110615 License type: Exclusive License Record date: 20140529 |
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Assignee: Wuhan fibercom Construction Group Co. Ltd. Assignor: Wuhan High Iron Pickets Work Technology Co.,Ltd. Contract record no.: 2014420000083 Date of cancellation: 20150602 |
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Address after: 430062, Wuhan City, Hubei province Wuchang District 158 East Avenue, D classic building, room 1802 Patentee after: Wuhan Qiancheng Piling Technology Co., Ltd. Address before: 430062, Wuhan City, Hubei province Wuchang District 158 East Avenue, D classic building, room 1802 Patentee before: Wuhan High Iron Pickets Work Technology Co.,Ltd. |