CN106351210B - A kind of mixing prefabricated pile and pile sinking construction method - Google Patents

A kind of mixing prefabricated pile and pile sinking construction method Download PDF

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Publication number
CN106351210B
CN106351210B CN201610876097.1A CN201610876097A CN106351210B CN 106351210 B CN106351210 B CN 106351210B CN 201610876097 A CN201610876097 A CN 201610876097A CN 106351210 B CN106351210 B CN 106351210B
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China
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pile
sections
stake
mixing
prefabricated pile
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CN106351210A (en
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何国富
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Sinopec Engineering Group Co Ltd
Sinopec Shanghai Engineering Co Ltd
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Sinopec Engineering Group Co Ltd
Sinopec Shanghai Engineering Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/24Prefabricated piles
    • E02D5/30Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D7/00Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
    • E02D7/02Placing by driving
    • E02D7/06Power-driven drivers

Abstract

The invention discloses it is a kind of mixing prefabricated pile and it is a kind of suitable for above cover the 4th be coating it is relatively thin, it is lower crouch it is severely-weathered or weathering bedrock formation top surface change greatly situation mixing prefabricated pile pile sinking construction method.The mixing prefabricated pile among stake reserve hollow channel, including A section with B sections, described A sections on B sections of the top, the A section concrete strength grade is B sections of ratio high;The mixing prefabricated pile and pile sinking construction method overcome on overlaying bedrock fluctuating place, and prefabricated stake top absolute altitude is not in place, the technological deficiency that stake end can not reliably take root;And the cost waste for effectively reducing cutting pile crown, greatly improved the bearing capacity and pile foundation job stability of stake.

Description

A kind of mixing prefabricated pile and pile sinking construction method
Technical field
The present invention relates to pile foundation engineering field more particularly to a kind of mixing prefabricated piles and pile sinking construction method.
Background technique
In China's wide geographic area, above covering the 4th is coating, lower this stratum condition ratio of the severely-weathered or middle weathered rocks that crouch Than being all.Especially in short hilly country, this soil layer with binary nature of pixel operation is very common.Since overlaying bedrock face becomes Change it is larger, using often encountered when pile foundation pile-type selection the problem of.Usual bored concrete pile is preferred embodiment, can be because stake is long It is adjusted at any time during construction pore-creating, but since there are construction qualities to control, sediment borehole cleaning is not in place, steel reinforcement cage for it Precast length not can determine that, long construction period, higher cost and the problems such as civilized construction without recommending to use, it is opposite prefabricated Stake (especially PHC) it is not in place despite the presence of absolute altitude and the problem of " to be beheaded ", but due to being of relatively low cost, constructing The advantages that quality and controllable period and more used.
However the cost of " beheading " is not although stinted using prefabricated pile, but still will appear another question.Stake top absolute altitude It is not in place, illustrate that an end may have arrived at bedrock surface, can not make a forcible entry into again, otherwise pile crown will be broken, and influence pile body Quality forms unstable outstanding pile, takes to design simultaneously because stake end cannot ensure to enter supporting course (basement rock) certain depth It is very unfavorable with vertical bearing capacity of single pile, or even deform and all there is certain hidden danger.Such case is relatively shallower for bedrock surface Place it is particularly disadvantageous.Find solve stake top absolute altitude of the prefabricated pile in overlaying bedrock fluctuating place be not in place, stake end can not be reliable The problem of taking root extremely is paid close attention to by engineers and technicians always, but there is no reliable technological means implementable at present.
Summary of the invention
In order to solve the above problem in the prior art, the present invention provides a kind of mixing prefabricated post and piling construction sides The technologies such as method overcomes on overlaying bedrock fluctuating place, and prefabricated stake top absolute altitude is not in place, stake end can not reliably take root lack It falls into, under conditions of holding prefabricated pile various technical advantages, the cost waste of cutting pile crown can be reduced, while improving holding for stake Loading capability, it is ensured that the stabilization of pile foundation has good Practical significance to China's pile foundation engineering.
First aspect of the present invention provides a kind of mixing prefabricated pile, and hollow channel is reserved among stake, and the mixing is pre- Stake processed includes A sections and B sections, described A sections on B sections of the top, the A section concrete strength grade is B sections of ratio high.
Preferably, the A section concrete strength grade is not less than C60, and the B section concrete strength grade is not more than C15.
Preferably, the mixing prefabricated pile pile body shape is cylindrical or cuboid.
Preferably, the section of the hollow channel is circle, and a diameter of 100-150mm is big to meet common Grouting Pipe It is small to be advisable.
Preferably, the section of the hollow channel is square, area 8000-18000mm2
Preferably, the A section for closing prefabricated pile and B sections of same sections, and described A sections and described B sections of arrangement of reinforcement method phase Together.
The mixing prefabricated pile overall length is L=LA+LB, and L, LA and LB can be used as three parameters, and pre-production is at different length Prefabricated pile, form pre-engineered serial pile-type, to adapt to different bedrock surface buried depth needs, wherein it is preferred that B segment length≤ 1m;It is further preferred that B segment length is 0.75m.
The mixing prefabricated pile that described A sections and described B section are formed, when production, can be segmented in a stake mould according to strength grade Pour pile.
Another aspect of the invention additionally provide it is a kind of suitable for above cover the 4th be coating, it is lower crouch it is severely-weathered or weathering The pile sinking construction method of the mixing prefabricated pile of bedrock formation, comprising the following steps:
Step 1: preparation mixing prefabricated pile as described in claim 1;
Step 2: being changed to weight after first time occurs jumping hammer with mixing prefabricated pile prepared in heavy hammer and low strike step 1 High strike mixes prefabricated pile, until last ten pile penetrations hit are less than 25-30mm, receive hammer and stops beating;
Step 3: using grouting pipe pass through pile body in hollow channel to lower part stake end, to stake end at slip casting, formed B sections Pile concrete fragment, bedrock surface surface weathering body, the part soil body and stake end bar are steady to pressure in the grouting and reinforcing body of one Stop slip casting after fixed.
Preferably, last ten pile penetrations hit are less than 25mm in the step 2.
Heavy hammer and low strike using drop hammer, any one in steam hammer, diesel hammer or hydraulic hammer, preferably diesel hammer.It is low to hit When pile monkey fall away between about 0.7m-1m, preferably from about 0.8m.
Pressure is not less than 1.0Mpa, preferably 1.0MPa during slip casting in the step 3.
The material of slip casting is cement base grout material in the step 2, forms B sections of pile concrete fragments, bedrock surface surface Weathering body, the part soil body and stake end bar are in the grouting and reinforcing body of one.
It the 4th is coating that mixing prefabricated pile and its pile sinking construction method provided by the present invention, which are suitable for above covering, lower sleeping strong The binary nature of pixel operation soil layer such as weathering or middle weathered rocks, be particularly suitable for covering the 4th be coating it is relatively thin, it is lower crouch it is severely-weathered or in The situation that weathered rocks stratum top surface changes greatly has good Practical significance.
Compared with prior art, the invention has the following advantages:
1) mixing prefabricated pile and its pile sinking construction method provided by the present invention, overcome in overlaying bedrock fluctuating place On, prefabricated stake top absolute altitude is not in place, the technological deficiency that stake end can not reliably take root;
2) the cost waste of cutting pile crown can be effectively reduced in hollow high low-intensity mixing prefabricated pile provided by the present invention, Greatly improve the bearing capacity and pile foundation job stability of stake.
Detailed description of the invention
Fig. 1 is the elevation of mixing prefabricated pile of the present invention;In figure: 1- stake top, 2-A sections, 3-B sections, 4- ends, H-H For the horizontal cross-section for mixing prefabricated pile.
Fig. 2 respectively illustrates the H-H sectional view of the mixing prefabricated pile of embodiment 1 and embodiment 2;In figure: 5- hollow channel, 6- reinforcing bar.
Fig. 3 is the piling construction schematic diagram of the mixing prefabricated pile of embodiment 1.
Specific embodiment
The present invention is further elaborated With reference to embodiment, but the present invention is not limited to following embodiment party Formula.
Embodiment 1
A kind of mixing prefabricated pile is present embodiments provided, as shown in Figure 1, pile-type is that hollow high low-intensity mixes prefabricated pile, It is made of A and two sections of B, A sections are and the common consistent pile for prestressed pipe of national standard specification, LA, B sections of length and A sections of same sections, length Degree is LB;Pile body is cylindrical, the reserved hollow channel in centre;The section of the hollow channel is circle, the circular diameter For 100mm, pile body H-H sectional view is as shown in Figure 2 a.
Above-mentioned mixing prefabricated pile overall length is L=LA+LB, and L, LA and LB can be used as three parameters, and pre-production is at different length The prefabricated pile of degree forms pre-engineered serial pile-type, to adapt to different bedrock surface buried depth needs;The length of LB is 0.8m.
Wherein, consistent with common national standard specification, the concrete strength such as the pile body construction, material of A sections of stakes and reinforcing bar configuration Grade is C80;B sections of stakes use low-grade concrete intensity, and strength grade is C15, and arrangement of reinforcement method is identical as A section.
The hollow high low-intensity mixing prefabricated piles of A sections and B section compositions, when production, can be in a stake moulds according to strength grade Segmentation pours pile.
Embodiment 2
A kind of mixing prefabricated pile is present embodiments provided, as shown in Figure 1, pile-type is that hollow high low-intensity mixes prefabricated pile, It is made of A and two sections of B, A sections are and the common consistent pile for prestressed pipe of national standard specification, LA, B sections of length and A sections of same sections, length Degree is LB;Pile body is cuboid, the reserved hollow channel in centre;The section of the hollow channel is square, the square Area is 18000mm2, pile body H-H sectional view is as shown in Figure 2 b.
Above-mentioned mixing prefabricated pile overall length is L=LA+LB, and L, LA and LB can be used as three parameters, and pre-production is at different length The prefabricated pile of degree forms pre-engineered serial pile-type, to adapt to different bedrock surface buried depth needs;The length of LB is 0.8m.
Wherein, consistent with common national standard specification, the concrete strength such as the pile body construction, material of A sections of stakes and reinforcing bar configuration Grade is C80;B sections of stakes use low-grade concrete intensity, and strength grade is C15, and arrangement of reinforcement method is identical as A section.
The hollow high low-intensity mixing prefabricated piles of A sections and B section compositions, when production, can be in a stake moulds according to strength grade Segmentation pours pile.
Embodiment 3
A kind of pile sinking construction method for mixing prefabricated pile is present embodiments provided, piling principle is as shown in figure 3, include following Step:
Step 1: preparing mixing prefabricated pile described in embodiment 1;
Step 2: it is hit first using diesel hammer is low, each pile monkey is fallen away from about 0.8m, when first time occurring jumping hammer, Stake end meets with bedrock surface, then proceedes to diesel hammer high strike, stops beating until receiving hammer when down degree of last ten hits is less than 25mm;
Step 3: grouting pipe is inserted into an end by the hollow channel in pile body, to stake end at carry out pressure be The high-pressure slip-casting of 1.5Mpa, formed B sections of pile concrete fragments, bedrock surface surface weathering body, the part soil body and stake end bar in The grouting and reinforcing body of one, stopping slip casting after pressure stabilisation.The injecting paste material is mortar.
Mixing prefabricated pile and its pile sinking construction method provided in this embodiment, overcome on overlaying bedrock fluctuating place, Prefabricated stake top absolute altitude is not in place, the technological deficiency that stake end can not reliably take root;And can be effectively reduced cutting pile crown at This waste greatly improves the bearing capacity and pile foundation job stability of stake.
Specific embodiments of the present invention are described in detail above, but it is merely an example, the present invention is simultaneously unlimited It is formed on particular embodiments described above.To those skilled in the art, any couple of present invention carries out equivalent modifications and Substitution is also all among scope of the invention.Therefore, without departing from the spirit and scope of the invention made by equal transformation and Modification, all should be contained within the scope of the invention.

Claims (4)

1. it is a kind of suitable for above cover the 4th be coating, it is lower crouch it is severely-weathered or weathering bedrock formation mixing prefabricated pile pile sinking Construction method, which comprises the following steps:
Step 1: preparing a kind of mixing prefabricated pile;
Step 2: being changed to weight high strike after first time occurs jumping hammer with mixing prefabricated pile prepared in heavy hammer and low strike step 1 Prefabricated pile is mixed, until last ten pile penetrations hit are less than 25mm, hammer are received and stops beating;
Step 3: using grouting pipe pass through pile body in hollow channel to lower part stake end, to stake end at slip casting, formed B sections of pile bodies Broken concrete, bedrock surface surface weathering body, the part soil body and stake end bar are after pressure stabilisation in the grouting and reinforcing body of one Stop slip casting;
Wherein, the mixing prefabricated pile reserves hollow channel among stake, and the mixing prefabricated pile includes A sections and B sections, the A For section on B sections of the top, the A section concrete strength grade is B sections of ratio high;
B segment length≤the 1m;The A section concrete strength grade is not less than C60, and the B section concrete strength grade is little In C15;The mixing prefabricated pile pile body shape is cylindrical or cuboid;
Described A sections and B sections of same sections, and A sections are identical with B sections of arrangement of reinforcement method.
2. pile sinking construction method according to claim 1, which is characterized in that the section of the hollow channel is circle, Diameter is 100-150mm.
3. pile sinking construction method according to claim 1, which is characterized in that the section of the hollow channel is square, Its area is 8000-18000mm2
4. pile sinking construction method according to claim 1, which is characterized in that the pressure during slip casting in the step 3 Power is not less than 1.0Mpa.
CN201610876097.1A 2016-10-08 2016-10-08 A kind of mixing prefabricated pile and pile sinking construction method Active CN106351210B (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1386936A (en) * 2002-05-28 2002-12-25 立基工程有限公司 Combined rock-embedding pile and its construction method
CN1458346A (en) * 2003-04-30 2003-11-26 立基工程有限公司 Rock engaged combined pile and its construction method
CN1896383A (en) * 2005-07-14 2007-01-17 胡柏英 Steel-pipe concrete assembled pile of predrilled hole rock-embedded and its construction
CN201520973U (en) * 2009-10-20 2010-07-07 上海强劲基础工程有限公司 Precast pile with grouting hole
CN103741683A (en) * 2013-12-23 2014-04-23 浙江天润建设有限公司 Bag bottom expanding rigid-flexible combined pile and construction method thereof
CN102808403B (en) * 2011-05-30 2014-07-02 宝山钢铁股份有限公司 Precast tubular pile and construction method thereof
CN105908773A (en) * 2016-06-12 2016-08-31 上海勘测设计研究院有限公司 Two-stage socketed pile wind turbine foundation for shallow covering stratum foundation of offshore wind plant and construction method

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Publication number Priority date Publication date Assignee Title
CN1386936A (en) * 2002-05-28 2002-12-25 立基工程有限公司 Combined rock-embedding pile and its construction method
CN1458346A (en) * 2003-04-30 2003-11-26 立基工程有限公司 Rock engaged combined pile and its construction method
CN1896383A (en) * 2005-07-14 2007-01-17 胡柏英 Steel-pipe concrete assembled pile of predrilled hole rock-embedded and its construction
CN201520973U (en) * 2009-10-20 2010-07-07 上海强劲基础工程有限公司 Precast pile with grouting hole
CN102808403B (en) * 2011-05-30 2014-07-02 宝山钢铁股份有限公司 Precast tubular pile and construction method thereof
CN103741683A (en) * 2013-12-23 2014-04-23 浙江天润建设有限公司 Bag bottom expanding rigid-flexible combined pile and construction method thereof
CN105908773A (en) * 2016-06-12 2016-08-31 上海勘测设计研究院有限公司 Two-stage socketed pile wind turbine foundation for shallow covering stratum foundation of offshore wind plant and construction method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
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浅谈TSC桩与PHC桩组合桩在海峡青年交流营地项目中的应用;鲍国宁;《江西建材》;20160610;第96-97页 *

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