CN103015413B - Construction method of composite pile with implanting-in rigid-body embedded into hard bearing stratum - Google Patents
Construction method of composite pile with implanting-in rigid-body embedded into hard bearing stratum Download PDFInfo
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Abstract
The invention discloses a construction method of a composite pile with an implanting-in rigid-body embedded into a hard bearing stratum. The method comprises the following steps: configurating drill rods and drill bits: configurating an upper drill rod used for large-diameter stirring and a lower drill rod used for small-diameter stirring in the hard bearing stratum according to soil layer distribution, and aligning a pile implanting machine to the soil position required by a design; grouting and drilling: using the pile implanting machine to drill and stir the soil through stirring blades of the upper drill rod and helical blades of the lower drill rod, meanwhile, pouring cement paste to the stirring soil, and drilling and stirring to the predetermined depth in place; withdrawing the rods: lifting the drilling rods to quit the stirring soil; implanting the pile: utilizing the pressure and vibration function of the pile implanting machine to embed the rigid body into the hard bearing stratum, so that the composite pile is formed. The method has the benefits that no slurry is transported outwards, the adjacent soil cannot be extruded, the bearing capacity of the pile body can be greatly improved, and the range of application is wide; and the method has the advantages of convenience for pile forming, fast construction speed, low construction cost, high bearing capacity and the like.
Description
Technical field
The present invention relates to a kind of construction technology of engineering pile, particularly relate to one and be applicable to common soil layer, for the novel pile body of pressure-bearing and resistance to plucking---strong stirring soil interplantation rigid body embeds the construction method of hard bearing stratum composite pile, and this novel pile body can be used as pressure bearing pile or the uplift pile in each field of civil engineering.
Background technology
At present, each field of the civil engineerings such as construction work, hydraulic engineering, road and bridge engineering, bored pile is the most frequently used pile body, it has the advantages such as construction technology maturation, equipment is simple, applicability is strong, but also there is the shortcomings such as cost is high, bore forming complex process, quality control requirement are high, especially drilled pile technique adopts mud off technology soil body drilling need be become mud to carry out outward transport process.Drilled pile mud outward transport process contaminated environment, is city problem anxious to be resolved, directly jeopardizes popularization and the utilization of conventional borehole castinplace pile.The piling technique how seeking not need mud to transport outward is one of R&D direction of current geotechnical engineering.
Squeeze into or be pressed into Prefabricated Reinforced Concrete Square Pile in each field of civil engineering or pile tube is also pile body the most frequently used at present.This stake has the advantages such as reliable in quality, speed of application is fast, cost is low.But this is a kind of Squeezing Soil Pile, comparatively large on periphery impact in pile, especially in city construction, because soil compaction jeopardizes the safety of peripheral path, underground utilities and building.This unfavorable factor limits the application of the Squeezing Soil Pile such as Prefabricated Reinforced Concrete Square Pile or pile tube.In addition, squeeze into or be pressed into preformed pile also exist some soil layers cannot or the problem that puts in place of very difficult pile, therefore to overcome the new pile body of above-mentioned conventional piles shortcoming of far-reaching significance in research and development.
How above-mentioned various pile body, in coastal deep soft soil, because soil nature is poor, pile side friction is very low, improves pile side friction, increases the bearing capacity of stake, is also the problem being worth solving.
Strong stirring soil interplantation rigid pile of the present invention embeds hard bearing stratum composite pile technology and develops under this background just.This new technology has pile convenience, applicability is strong, pile quality is reliable, speed of application is fast, cost is low, bearing capacity is high, without soil compaction and without the need to advantages such as mud outward transport process, also solve the low problem of deep soft soil Lateral frictional resistance simultaneously.This new technology apply the needs meeting current city sustainable development, also for great amount of investment has been saved in engineering construction, of far-reaching significance.
Summary of the invention
The invention provides a kind of construction method of novel pile body, the mud existed when solving conventional borehole filling pile construction outward transport problem, and directly squeeze into the soil compaction problem of preformed pile existence.
Interplantation rigid body embeds a construction method for hard bearing stratum composite pile, comprises the steps:
1), drilling rod and drill bit is configured, the top rod stirred for major diameter and the bottom drilling rod stirred for minor diameter in hard bearing stratum is configured according to clay distribution, the special drill of air impact should be worn to embed basement rock, and pile driver is aimed at the soil body position of designing requirement;
2), slip casting is crept into, pile driver to be crept into the soil body by the stirring vane of top rod and the helical blade of bottom drilling rod and stirs, inject cement paste by grouting equipment to the stirring soil body simultaneously, and spray that baric flow air is auxiliary to be stirred, creep into and be stirred to desired depth and put in place;
3), move back bar, promote drilling rod, the drill bit of top and the bottom drilling rod and stirring vane, helical blade are exited the stirring soil body;
4), plant stake, utilize the pressure of pile driver and vibrating function that rigid body is embedded hard bearing stratum;
5), form composite pile, after stirring the soil body and cement paste Homogeneous phase mixing, condense into cement-soil, wrap rigid body and form composite pile.
When soil body top is Soft Soil Layer, when bottom is hard bearing stratum, and designing requirement rigid body to enter hard bearing stratum dark, pile driver only can being installed the drill bit of top rod and stirring vane for stirring the soil body, creeping into desired depth, stopping creeping into; When implanting rigid body, by pile driver, rigid body is directly pressed into hard bearing stratum.
Stirring vane stirs the circular diameter of formation at 600 ~ 1800mm; Described cement mixing ratio is 15% ~ 25%.
Designing requirement rigid body enters hard bearing stratum when comparatively deeply even entering in horizon d, stirring vane, helical blade, drill bit that pile driver should configure top rod, bottom drilling rod and match with upper and lower part drilling rod.
In step 2) in, when bottom rod bit enters hard bearing stratum, helical blade to hard bearing stratum even horizon d carry out stirring and creep into, while stirring is crept into, improve and inject the concentration of cement paste, creep into the designing requirement degree of depth, connect down by step 3), 4), 5) construction.The cement paste injected in the rod boring of aforementioned bottom and hard bearing stratum stir native formation and strengthen cement-soil, and cement additive ratio is 40%; The circular diameter that helical blade stirrer is formed is greater than rigid body diameter 100 ~ 200mm, is less than cement-soil diameter.
When the soil nature of soil body top and the bottom soil layer is all better, the stirring vane on drilling rod is equal with the circular diameter that helical blade stirrer is formed, the large 100 ~ 500mm of specific rigidity body diameter; The cement additive ratio of cement-soil is 20% ~ 30%.
Rigid body can be the prefabricated pile body of the various cross sectional shapes such as prefabricated reinforced concrete pile tube, ring pile tube, square pile, hollow square pile or various forms steel pipe pile.
It is 0.3 ~ 1.0 m/min that pile driver creeps into speed, and stirring the speed of rotation is 16 ~ 30 revs/min.
Pile driver drilling rod is made up of upper and lower two parts, top rod with spiral stirring vane spaced apart and drill bit, bottom drilling rod with continuous distributed helical blade and there is the basement rock drill bit of auxiliary air impact function.
When pile driver creeps into stirring, by cement paste and stirring soil body uniform stirring, in order to better stirring, the head of drill bit sprays baric flow air and is used for auxiliary stirring.Gas sprays from drill bit head, impacts on the one hand to the soil body crept into, and when gas overflows in stirring soil on the other hand, has an auxiliary effect of stirring to stirring soil.
In the coastal soil body, there is deep Soft Soil Layer, because soil nature is poor, general pile body is difficult to solve the low problem of pile side friction, and the Novel pile body that the present invention adopts can improve pile side friction according to the character of the soil body, increases the bearing capacity of stake.
If Soft Soil Layer, by adopting large diameter stirring size, the small diameter rigid body of itself and interplantation is made to form compound pile body.Cheap cement-soil is utilized to expand the peripheral diameter of pile body, increase surface area and the pile side friction of pile body, solve the problem that weak soil frictional force is low, reach the effect increasing pile capacity, pile side friction and the anti-bearing strength of pile body (providing primarily of rigid body) are matched.If soil body proterties is better, then can reduce agitation pile diameter, the strong stirring function that a machine is provided can stir the soil body smoothly, and it stirs diameter and is as the criterion can meet pile side friction requirement after forming compound pile body.The drill bit of head zone of strong stirring drilling rod and the rigid body of the diameter of helical blade and implantation of this special stake machine match.This drill bit and helical blade are conducive to rigid body and enter hard bearing stratum even horizon d.Enter after hard bearing stratum (basement rock) puts in place when stake machine drill enters stirring, inject certain high-intensity cement paste, make the rigid body of implantation and hard bearing stratum can better be in conjunction with, to guarantee that compound bearing capacity of pile tip reaches requirement of strength.
In sum, the technical solution used in the present invention is the powerful drilling stirring pile-grafting machine utilizing new research and development, utilize its single shaft strong stirring and creep into function, first by designing requirement, the soil body is carried out strong stirring and crept into, marginal not slurry is crept on limit simultaneously, form soil cement slurry, then utilize the lifting of pile driver, location, vibration or static pressure function to be implanted by rigid body and put in place, form composite pile.Hard bearing stratum or basement rock are entered to pile body, the powerful drilling agitating function utilizing pile driver special, by baric flow air impact grinding, after putting in place by designing requirement percussion drilling, rigid body is embedded in hard bearing stratum or basement rock, reach design bearing capacity requirement.
The invention has the beneficial effects as follows:
1, creep into stirring by special pile driver to the soil body, inject cement paste simultaneously to the stirring soil body, form flowing shape soil cement slurry, comparing the problem that conventional borehole castinplace pile needs to transport outward a large amount of mud contamination environment, there is not the problem of mud outward transport in the present invention;
2, because soil cement slurry is in flowing shape, when implanting rigid body, rigid body impels soil cement slurry up to move to the pressure that periphery soil cement slurry produces, and can not produce extruding to the periphery soil body;
3, because composite pile enters hard bearing stratum even in horizon d, the bearing capacity of pile body can greatly be improved;
4, expanded the peripheral diameter of pile body by cheap cement-soil, increase surface area and the pile side friction of pile body, solve the problem that weak soil frictional force is low, pile side friction and the anti-bearing strength of pile body are matched, improves the bearing capacity of pile body;
5, the special drill of professional pile driver outfit, utilizes the impact grinding function that baric flow air produces, can effectively creep in basement rock, ensure that compound pile body embeds horizon d;
6, by spraying baric flow air, making cement paste and stirring the full and uniform stirring of the soil body;
7, the present invention is applied widely, can provide different schemes, construct targetedly according to various soil mass, and conventional borehole stake compared by its composite pile formed and preformed pile has pile convenience, speed of application is fast, cost is low, bearing capacity advantages of higher.
Accompanying drawing explanation
Fig. 1 is the unitary construction figure of composite pile in the embodiment of the present invention 1;
Fig. 2 is the sectional view along A-A in Fig. 1;
Fig. 3 is the constructional drawing that in the embodiment of the present invention 2, composite pile embeds hard bearing stratum;
Fig. 4 is the sectional view along B-B in Fig. 3;
Fig. 5 is the sectional view along C-C in Fig. 3;
Fig. 6 is composite pile pile body structure figure in the embodiment of the present invention 3;
Fig. 7 is the sectional view along D-D in Fig. 6;
Fig. 8 is the force-mechanism figure of composite pile of the present invention;
Fig. 9 is the structure chart of construction pile driver drilling rod of the present invention.
Detailed description of the invention
Embodiment 1
First the top rod stirred for major diameter and the bottom drilling rod stirred for minor diameter in hard bearing stratum is configured according to clay distribution during composite pile construction, the special drill of air impact should be worn to embed basement rock, and pile driver is aimed at the soil body position of designing requirement.
As shown in Figure 9, pile driver drilling rod is made up of upper and lower two parts, top rod 4 and bottom drilling rod 5 are linked into an integrated entity by bindiny mechanism, top rod 4 with spiral stirring vane 6 spaced apart and drill bit, bottom drilling rod 5 with continuous distributed helical blade 7 and there is the basement rock drill bit of auxiliary air impact function.
As shown in Figure 1-2, when soil body top is coastal ubiquitous soft soil layer, bottom is hard bearing stratum, designing requirement composite pile enter the degree of depth of hard bearing stratum more shallow time, the concrete construction method of composite pile is:
Pile driver only can install drill bit and the stirring vane 6 of top rod 4, by the stirring vane 6 on pile driver drilling rod, strong stirring is carried out to soft soil layer, inject cement paste simultaneously, creeping into stirring simultaneously, spray the auxiliary stirring of baric flow air, make the soil body form the soil cement slurry hole of diameter D1, utilize soil cement slurry in hole to form retaining wall, prevent from caving in.Wherein soil cement slurry is cement paste and the mixture stirring the soil body.The speed of creeping into of pile driver is 0.3 m/min, and Stirring speed is 16 revs/min.
Rod boring is stirred to the designing requirement degree of depth, stops creeping at the uniform velocity stirring, and is fully mixed by cement paste with the stirring soil body.
After cement paste fully mixes with the stirring soil body, then drilling rod is promoted, drill bit and stirring vane are exited the stirring soil body, utilize the pressure of pile driver and vibrating function are implanted by preformed rigid body 1 and embed in hard bearing stratum by rigid body 1, after soil cement slurry condensation, form the cement-soil 2 wrapping rigid body 1.
Rigid body 1 in embodiment is steel pipe pile, and diameter is 300 ~ 800mm, and the diameter D1 of cement-soil 2 is between 600 ~ 1800mm, and cement-soil 2 cement additive ratio is 15% ~ 25%.
Embodiment 2
As in Figure 3-5, when soil body top is soft soil layer, bottom is hard bearing stratum, and designing requirement composite pile enters in the comparatively dark even horizon d of the degree of depth of hard bearing stratum, and the concrete construction method of composite pile is:
First pile driver stirring vane 6, helical blade 7, the drill bit that should configure top rod 4, bottom drilling rod 5 and match with upper and lower part drilling rod;
The construction method of the soft soil layer in top is identical with the soft soil layer construction method in embodiment 1, all carry out major diameter mixing-filling by the 6 pairs of soil bodys of the stirring vane on pile driver drilling rod, the soil cement slurry hole of diameter D1 is formed in Soft Soil Layer, but the speed of creeping into of pile driver is 1 m/min, and Stirring speed is 30 revs/min.
Drill bit on bottom drilling rod 5 and helical blade 7 are when to hard bearing stratum, even horizon d creeps into, creep into speed and can be reduced to 0.3 m/min, Stirring speed is 16 revs/min, while creeping into stirring, improve the concentration injecting cement paste, to the designing requirement degree of depth, continue slip casting at the hard bearing stratum section of embedding, the reinforcement cement-soil 3 of diameter D2 after cement paste is condensed, can be formed.Complete after creeping into stirring, move back bar, implant rigid body 1, and utilize the vibration press-in function of pile driver to be embedded in hard bearing stratum or horizon d by rigid body 1 to put in place, until cement-soil 2 and strengthen cement-soil 3 condense after formation meet the composite pile of design bearing capacity requirement.
Strengthen the large 100 ~ 200mm of diameter D2 specific rigidity body 1 diameter D of cement-soil 3, be less than cement-soil 2 diameter D1.The cement additive ratio strengthening cement-soil 3 is 40%, and rigid body 1 is steel pipe pile.
Embodiment 3
As shown in fig. 6-7, when construction soil response levels soil nature is all better, but adopt and traditional squeeze into or be pressed into preformed pile pile and put in place and have any problem, adopt method of the present invention comparatively easy, Specific construction step is as follows:
Pile driver creeps into stirring by the stirring vane on drilling rod and helical blade to the soil body, while creep into slip casting while stirring, then hard bearing stratum or the horizon d degree of depth of designing requirement is entered, move back bar, utilize the vibration of pile driver and press-in function to be implanted by rigid body to put in place, form cement-soil 2 after cement paste condensation, cement-soil 2 wraps up rigid body 1 and forms the composite pile meeting requirement for bearing capacity.
Wherein stirring vane is equal with the circular diameter that helical blade stirrer is formed, the large 100 ~ 500mm of specific rigidity body 1 diameter, and diameter is cement-soil 2 cement additive ratio of D3 is 20% ~ 30%.Rigid body 1 is steel pipe pile, and wherein creeping into speed is 0.7 m/min, and Stirring speed is 23 revs/min.
Those skilled in the art are to be understood that; above-mentioned detailed description of the invention; and be not used to limit concrete scope of the present invention; any those skilled in the art; the technical scheme adopting equivalent replacement or equivalent transformation to be formed under the prerequisite not departing from design of the present invention and principle, all drops on application claims protection domain.
Claims (1)
1. interplantation rigid body embeds a construction method for hard bearing stratum composite pile, it is characterized in that: comprise the steps:
1), drilling rod and drill bit is configured, the top rod (4) stirred for major diameter and the bottom drilling rod (5) stirred for minor diameter in hard bearing stratum is configured according to clay distribution, the special drill of air impact should be worn to embed basement rock, and pile driver is aimed at the soil body position of designing requirement;
2), slip casting is crept into, pile driver to be crept into the soil body by the stirring vane (6) of top rod (4) and the helical blade (7) of bottom drilling rod (5) and stirs, inject cement paste by grouting equipment to the stirring soil body simultaneously, and spray that baric flow air is auxiliary to be stirred, creep into and be stirred to desired depth and put in place;
3), move back bar, promote drilling rod, the drill bit of top and the bottom drilling rod and stirring vane (6), helical blade (7) are exited the stirring soil body;
4), plant stake, utilize the pressure of pile driver and vibrating function that rigid body (1) is embedded hard bearing stratum;
5), form composite pile, after stirring the soil body and cement paste Homogeneous phase mixing, condense into cement-soil (2), wrap rigid body (1) and form composite pile;
Described soil body top is Soft Soil Layer, bottom is hard bearing stratum, designing requirement rigid body (1) enters hard bearing stratum when comparatively deeply even entering horizon d, and pile driver should configure top rod (4), bottom drilling rod (5) and the stirring vane (6) matched with upper and lower part drilling rod, helical blade (7), drill bit;
In step 2) while middle and lower part drilling rod (5) drill bit enters hard bearing stratum, improve the concentration injecting cement paste, connect down by step 3), 4), 5) construction; Aforementioned bottom drilling rod (5) is crept into the cement paste of middle injection and hard bearing stratum and is stirred soil and condense to be formed and strengthen cement-soil (3), and cement additive ratio is 40%;
Described bottom drilling rod helical blade (7) is stirred the circular diameter formed and is greater than rigid body (1) diameter 100 ~ 200mm, is less than cement-soil (2) diameter;
Described pile driver drilling rod is made up of upper and lower two parts, top rod (4) with spiral stirring vane (6) spaced apart and drill bit, bottom drilling rod (5) with continuous distributed helical blade (7) and there is the basement rock drill bit of auxiliary air impact function;
Described baric flow air sprays from the head of drill bit.
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| CN103243713A (en) * | 2013-05-07 | 2013-08-14 | 天津建城基业集团有限公司 | Method for planting prestressed pipe pile at one step |
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| CN108978641A (en) * | 2018-08-17 | 2018-12-11 | 江苏劲桩基础工程有限公司 | The construction method of compound strength stake |
| CN110306542B (en) * | 2019-06-24 | 2023-10-10 | 中冶集团武汉勘察研究院有限公司 | Construction method of cement concrete composite pile with high-pressure cement soil as inner core |
| CN111535315A (en) * | 2020-05-01 | 2020-08-14 | 黑龙江省寒地建筑科学研究院 | Construction method for drilling and grouting implanted pile |
| CN112502140A (en) * | 2020-12-09 | 2021-03-16 | 吉林东煤建筑基础工程公司 | Cement mixing implantation pile construction method and cement mixing implantation pile |
| CN113309088A (en) * | 2021-05-20 | 2021-08-27 | 江苏乐建建设有限公司 | Hole-leading pile-planting equipment and construction method |
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Effective date of registration: 20180615 Address after: 310058 104, room 6, 6 building, 553 ho Mu Road, Gongshu District, Hangzhou, Zhejiang. Patentee after: Hangzhou Nanlian Base Foundation Engineering Co., Ltd. Address before: 310000 16, B block, Rubo International Building, 673, Xihu District, Hangzhou, Zhejiang. Co-patentee before: Yan Ping Patentee before: Hangzhou Nanlian Civil Engineering Technology Co., Ltd. |