CN1322204C - Preset stiff core rammed concrete pile and its construction method - Google Patents
Preset stiff core rammed concrete pile and its construction method Download PDFInfo
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- CN1322204C CN1322204C CNB2004100938795A CN200410093879A CN1322204C CN 1322204 C CN1322204 C CN 1322204C CN B2004100938795 A CNB2004100938795 A CN B2004100938795A CN 200410093879 A CN200410093879 A CN 200410093879A CN 1322204 C CN1322204 C CN 1322204C
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Abstract
The present invention discloses a preset stiff core rammed cement soil pile and a construction method, which is suitable for the field of civil engineering to ground foundation. The preset stiff core rammed cement soil pile comprises a rammed cement soil pile, wherein a stiff core pile is arranged in a pile body of the rammed cement soil pile. The pile length of the stiff core pile is greater than or equal to the 2/3 length of the preset stiff core rammed cement soil pile. The material of the pile body of the stiff core pile is plain concrete or reinforced concrete. The construction method comprises steps that the stiff core pile is prefabricated; a hole is formed; the cement soil pile is rammed by a stiff core ramming hammer; the prefabricated stiff core pile is placed; a cement soil pile ring around the stiff core pile is rammed by a hollow core ramming hammer to a hole opening; the pile is formed, etc. Because the material of the pile body of the stiff core pile is the plain concrete or the reinforced concrete, and the stiff core pile is embedded and preset in the pile body of the cement soil pile rammed by the stiff core to certain length. The single-pile bearing capacity of the construction method can enhance more than 30 percent, and more than 20 percent of manufacturing cost is saved. The present invention has the advantages of high pile type single-pile bearing capacity, little pile body deformation, convenient construction, low manufacturing cost, no pollution and no noise and has obvious economical and social benefits.
Description
Technical field
The present invention relates to cement earth pile and job practices thereof, especially preset stiff core rammed concrete pile and job practices thereof are applicable to civil engineering-foundation field.
Background technology
" rammed concrete pile " of the prior art, it is with cement and soil by a certain percentage behind the mix, layering filling tamped pile in the stake hole.Its bearing capacity of single pile is by two conditional decisions: the one, stake week soil a collateral resistance and the end resistance of stake end soil, the 2nd, the load that pile is subjected to will guarantee pile body safety; Bearing capacity of single pile is got the low value in above two conditions.Because rammed concrete pile pile shaft material intensity is low, the maximum bearing capacity of single pile of decision rammed concrete pile can not surpass the maximum load that stake can bear when guaranteeing pile body safety, therefore, when the stake of rammed concrete pile when reaching its maximum bearing capacity of single pile, strengthen again that the rammed concrete pile stake is long can not to improve its bearing capacity of single pile yet.In addition, rammed concrete pile is because pile shaft material is the cement-soil material, and the cement-soil material is compared with concrete material, and its modulus of elasticity is low, so pile body has a certain amount of compressive strain during the rammed concrete pile load-bearing, this deformation ratio concrete pile distortion is big.Because rammed concrete pile has the shortcoming of low bearing capacity of single pile and timber pile body deformability, has limited the application of compaction soil-cement pile scope.
Summary of the invention
Technical problem to be solved by this invention is to overcome the deficiency that prior art exists, and the preset stiff core rammed concrete pile that a kind of bearing capacity of single pile is big and the pile body distortion is little is provided.Another technical problem to be solved by this invention is that the preset stiff core rammed concrete pile job practices that a kind of bearing capacity of single pile is big and the pile body distortion is little is provided.
For solving the problems of the technologies described above, preset stiff core rammed concrete pile of the present invention comprises rammed concrete pile and preset stiff core.In the described rammed concrete pile pile body core stake energetically is set, the stake of described strength core stake is long more than or equal to 2/3rds of preset stiff core rammed concrete pile length.
Described strength core stake stake top area is more than or equal to presetting 20% of described stiff core rammed concrete pile stake top area.
The stake of described strength core is a preformed pile, and the stake cross section is circular, annular or square.
The material of described strength core stake pile body is plain concrete or steel concrete.
For solving the problems of the technologies described above, the job practices of preset stiff core rammed concrete pile of the present invention may further comprise the steps:
(a) pore-forming: adopt rammed concrete pile common process pore-forming;
(b) construction strength core stake stake end following pile body: the rammed concrete pile technology following rammed concrete pile of stiffness stake stake end of constructing routinely;
(c) place the stiffness stake:, in the stake hole, place the stake of strength core with the displacement of aperture rammer machine;
(d) preset compacting strength core stake cement-soil anchor ear on every side: aperture rammer machine is resetted, use the construction of hollow hammer ram, rammed concrete pile requires to finish the construction of rammed concrete anchor ear in the long scope of strength core stake stake routinely;
(e) equipment displacement, next pile of constructing.
The stake of described strength core is placed in the middle, vertical in described stake hole.
The hollow size of the hollow hammer ram of described (d) step is than the big 50mm of strength core stake maximum diameter of pile.
Compared with prior art, the present invention has following beneficial effect: because the material of strength core stake pile body is plain concrete or steel concrete, the stake of strength core embeds certain-length in the preset stiff core rammed concrete pile pile body, bearing capacity of single pile can improve more than 30%, cost is saved more than 20%, this type bearing capacity of single pile height, pile body deformation are little, easy construction, cheap, pollution-free, noiselessness, have tangible economic benefit and social benefit.
Description of drawings
The schematic diagram of Fig. 1 preset stiff core rammed concrete pile of the present invention.
Reference numeral: the 1. stake of strength core, 2. rammed concrete pile.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is described in detail.
Fig. 1 is a preset stiff core rammed concrete pile, the figure shows out the structure of preset stiff core rammed concrete pile, has reflected that preset stiff core rammed concrete pile is made up of rammed concrete pile and the stake of strength core, and the stiffness stake is positioned at rammed concrete pile stake core.
As shown in Figure 1, preset stiff core rammed concrete pile of the present invention comprises rammed concrete pile.Core stake energetically is set in the rammed concrete pile pile body, and the stake of strength core stake is long more than or equal to 2/3rds of preset stiff core rammed concrete pile length.Strength core stake stake top area is more than or equal to presetting 20% of described stiff core rammed concrete pile stake top area.The stake of strength core is a preformed pile, and the stake cross section is circular, annular or square.The material of strength core stake pile body is plain concrete or steel concrete.
In Fig. 1 embodiment, in ground, make rammed concrete pile 2 by the pile facility, when the compacting of rammed concrete pile 2 highly reaches the stake end design elevation of strength core stake 1, strength core stake 1 is placed in the stake hole of rammed concrete pile 2, with hammer ram rammed concrete mix, until the stake top, finish the making of preset stiff core rammed concrete pile from bottom to top.
Determining of bearing capacity of single pile characteristic value of the present invention:
According to the geotechnical investigation data of pile top load and project site, press stake footpath and pilespacing that national regulation or local rules are tentatively determined rammed concrete pile, determine bearing capacity of single pile characteristic value R with following formula
a:
R
a＝q
paA
p+u
pΣq
sial
i
In the formula: R
a-vertical bearing capacity of single pile paricular value;
q
Pa, q
Sia-rammed concrete pile stake end end resistance, pile side resistance characteristic value, calculate by local results of dead load statistical analysis;
A
p-rammed concrete pile stake bottom cross sectional area;
u
p-rammed concrete pile pile body peripheral length;
l
iThe thickness of-Di i layer ground.
By stake long L, i.e. the L=Σ l that can obtain preset stiff core rammed concrete pile after the above formula calculating
i
Long 2/3rds of the long L of preset stiff core rammed concrete pile that is not less than of stake of strength core stake, strength core stake stake top area is not less than 20% of preset stiff core rammed concrete pile stake top area.
Strength core stake concrete strength of pile should satisfy the Design of Bearing Capacity requirement of stake, and pile strength should conform to the following formula requirement:
Q≤0.75A
pf
c
In the formula: f
c-concrete axial compressive strength design load; By existing " Code for design of concrete structures " value;
Single-pile vertical orientation power design load when Q-makes up substantially corresponding to load effect;
A
p-pile body cross-sectional area.
The stake type of strength core of the present invention stake:
The stake of strength core is a preformed pile, and the stake cross section is circular, annular or square, and material of body of a pile is plain concrete or steel concrete.
Job practices of the present invention:
The technological process of preset stiff core rammed concrete pile is: the stake of prefabricated strength core, pore-forming, with real core hammer ram rammed concrete pile, place the stake of prefabricated strength core, with hollow hammer ram compacting strength core stake cement-soil anchor ear on every side to the aperture, pile finishes.Concrete construction sequence is:
(a) pore-forming: adopt rammed concrete pile common process pore-forming;
(b) construction strength core stake stake end following pile body: the rammed concrete pile technology following rammed concrete pile of stiffness stake stake end of constructing routinely;
(c) place the stiffness stake: with the displacement of aperture rammer machine, in the stake hole, place the stake of strength core, guarantee that the stake of strength core is placed in the middle in the stake hole, vertical.
(d) preset compacting strength core stake cement-soil anchor ear on every side: aperture rammer machine is resetted, change hollow hammer ram (the hollow size is than the big 50mm of strength core stake maximum diameter of pile), rammed concrete pile requires to finish the construction of rammed concrete anchor ear in the long scope of strength core stake stake routinely.
(e) equipment displacement, next pile of constructing.
Preset stiff core rammed concrete pile of the present invention detects:
When preset stiff core rammed concrete pile was used for pile foundation or composite foundation, its detection method was carried out current national codes or local rules in pile foundation or the composite foundation field.
Beneficial effect of the present invention: (1) bearing capacity of single pile can improve more than 30%; (2) cost is saved more than 20%; (3) should Stake type bearing capacity of single pile height, pile body deformation are little, easy construction, cheap, pollution-free, noiselessness, have obvious economy Benefit and social benefit.
Claims (7)
1. the job practices of a preset stiff core rammed concrete pile is characterized in that, may further comprise the steps:
(a) pore-forming: adopt rammed concrete pile common process pore-forming;
(b) construction strength core stake stake end following pile body: the rammed concrete pile technology following rammed concrete pile of stiffness stake stake end of constructing routinely;
(c) place the stiffness stake:, in the stake hole, place the stake of strength core with the displacement of aperture rammer machine;
(d) the cement-soil anchor ear around the stake of compacting strength core: aperture rammer machine is resetted, use the construction of hollow hammer ram, rammed concrete pile requires to finish the construction of rammed concrete anchor ear in the long scope of strength core stake stake routinely;
(e) equipment displacement, next pile of constructing.
2. the job practices of preset stiff core rammed concrete pile according to claim 1 is characterized in that, the stake of described strength core is placed in the middle, vertical in described stake hole.
3. the job practices of preset stiff core rammed concrete pile according to claim 1 is characterized in that, the hollow size of the hollow hammer ram of described (d) step is than the big 50mm of strength core stake maximum diameter of pile.
4. one kind by the made preset stiff core rammed concrete pile of the described job practices of claim 1, comprise rammed concrete pile, it is characterized in that, in the described rammed concrete pile pile body core stake energetically is set, the stake of described strength core stake is long more than or equal to 2/3rds of preset stiff core rammed concrete pile length.
5. preset stiff core rammed concrete pile according to claim 4 is characterized in that, described strength core stake stake top area is more than or equal to presetting 20% of described stiff core rammed concrete pile stake top area.
6. preset stiff core rammed concrete pile according to claim 4 is characterized in that, the stake of described strength core is a preformed pile, and the stake cross section is circular, annular or square.
7. preset stiff core rammed concrete pile according to claim 4 is characterized in that, the material of described strength core stake pile body is plain concrete or steel concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100938795A CN1322204C (en) | 2004-12-09 | 2004-12-09 | Preset stiff core rammed concrete pile and its construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100938795A CN1322204C (en) | 2004-12-09 | 2004-12-09 | Preset stiff core rammed concrete pile and its construction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1619064A CN1619064A (en) | 2005-05-25 |
| CN1322204C true CN1322204C (en) | 2007-06-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100938795A Expired - Fee Related CN1322204C (en) | 2004-12-09 | 2004-12-09 | Preset stiff core rammed concrete pile and its construction method |
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| CN (1) | CN1322204C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104929109B (en) * | 2015-05-20 | 2017-09-19 | 骆嘉成 | Displaced type pressure is poured water the long-spiral drilling machine used in soil composite pile and its construction method and construction method |
| CN104929110B (en) * | 2015-05-20 | 2017-07-14 | 孙文 | The long-spiral drilling machine used in variation rigidity composite pile and its construction method and construction method |
| CN106759394A (en) * | 2016-12-27 | 2017-05-31 | 天津大学 | The box-like composite foundation of composite pile cement earth pile partition group |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1074262A (en) * | 1992-12-19 | 1993-07-14 | 中国建筑科学研究院地基基础研究所 | The rammed concrete pile technology that is used to lay the foundations |
| CN1260425A (en) * | 1998-12-18 | 2000-07-19 | 邹宗煊 | Making method for reinforced concrete stiff-core cement soil composite pile and its pile and construction equipment |
| JP2003221828A (en) * | 2001-11-20 | 2003-08-08 | Geotop Corp | Burying method for prefabricated pile |
| CN2587933Y (en) * | 2002-12-25 | 2003-11-26 | 曾毅学 | Reinforced cement composite pile |
| CN2613518Y (en) * | 2003-03-04 | 2004-04-28 | 饶英伟 | Long core concrete composite pile |
| CN2658220Y (en) * | 2003-07-15 | 2004-11-24 | 饶之帆 | Cement soil compound pile with abnormal concrete |
-
2004
- 2004-12-09 CN CNB2004100938795A patent/CN1322204C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1074262A (en) * | 1992-12-19 | 1993-07-14 | 中国建筑科学研究院地基基础研究所 | The rammed concrete pile technology that is used to lay the foundations |
| CN1260425A (en) * | 1998-12-18 | 2000-07-19 | 邹宗煊 | Making method for reinforced concrete stiff-core cement soil composite pile and its pile and construction equipment |
| JP2003221828A (en) * | 2001-11-20 | 2003-08-08 | Geotop Corp | Burying method for prefabricated pile |
| CN2587933Y (en) * | 2002-12-25 | 2003-11-26 | 曾毅学 | Reinforced cement composite pile |
| CN2613518Y (en) * | 2003-03-04 | 2004-04-28 | 饶英伟 | Long core concrete composite pile |
| CN2658220Y (en) * | 2003-07-15 | 2004-11-24 | 饶之帆 | Cement soil compound pile with abnormal concrete |
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| Publication number | Publication date |
|---|---|
| CN1619064A (en) | 2005-05-25 |
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Assignee: Tianjin University Research Institute of Architectrual Design & Urban Planning Assignor: Tianjin University Contract record no.: 2011120000144 Denomination of invention: Preset stiff core rammed concrete pile and its construction method Granted publication date: 20070620 License type: Exclusive License Open date: 20050525 Record date: 20110816 |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070620 Termination date: 20201209 |