CN101608455B - Cavity backfill type pile soil bearing capacity adjusting device - Google Patents
Cavity backfill type pile soil bearing capacity adjusting device Download PDFInfo
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- CN101608455B CN101608455B CN2008100390878A CN200810039087A CN101608455B CN 101608455 B CN101608455 B CN 101608455B CN 2008100390878 A CN2008100390878 A CN 2008100390878A CN 200810039087 A CN200810039087 A CN 200810039087A CN 101608455 B CN101608455 B CN 101608455B
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- cavity
- pile
- bearing capacity
- adjusting device
- concrete
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Abstract
The invention provides a cavity backfill type pile soil bearing capacity adjusting device. The device comprises a cylindrical steel component, wherein the top end of the cylindrical steel component is fixedly connected with a top cover; and the top cover is provided with a concrete casting hole and an exhaust inspection hole. The device is characterized in that the device can be freely deformed in the vertical direction in a cavity state; and after concrete is cast in the cavity, the device can ensure force transfer. After pile construction is carried out at certain height from the designed elevation, the adjusting device is placed on the top of the pile to form a pile top cavity; the adjusting device has small vertical rigidity, can be probably deformed freely in the early phase of the construction of the upper structure; upper load is not transferred to a foundation pile, and is transferred to the natural foundation through a bottom board; and foundation soil can participate in construction in advance. When the upper structure is constructed to certain degree according to the design requirement, concrete is cast into the cavity, and the pile and the foundation soil share the added load according to the rigidity proportion. The device has clear and definite concept on the bearing capacity of the pile and the soil, is advantageous to sufficient mobilization of the bearing capacity of the foundation soil, reduces the number of piles, and saves construction cost.
Description
Technical field:
The present invention relates to the civil construction field, relate in particular to the base apparatus of bridge, building or structure, is a kind of cavity backfill type pile soil bearing capacity adjusting device.
Background technology:
Building and structure often adopt the composite pile foundation of pile soil common action.Because the rigidity of stake is much larger than the rigidity of natural ground, stake is inevitable earlier stressed, and only after pile foundation produced moderate finite deformation, foundation soil just participated in work.Higher for the foundation soil supporting capacity, but still be not enough to bear whole loads, and pile foundation is out of shape less situation, usually has to sacrifice the bearing capacity of foundation soil self, only bears upper load by stake.The distribution of bearing capacity between the stake soil, all the time be a mystery, design is based upon on the basis of experience, for addressing this problem, some experts and scholars recently try out on the stake top and add rubber pad, under the effect of upper load, the less rubber pad of rigidity can produce bigger distortion, makes foundation soil participate in carrying work in advance, and upper load is distributed to stake and natural ground according to rigidity.But rubber pad is set needs complicated computational analysis, and makes rubber pad separately according to project situation, and cost is higher, therefore applies being subjected to certain limitation.
Summary of the invention:
The object of the present invention is to provide a kind of cavity backfill type pile soil bearing capacity adjusting device, described this cavity backfill type pile soil bearing capacity adjusting device can solve the problem that composite pile foundation in the prior art fails to make the bearing capacity of natural ground soil to be given full play to.
Cavity backfill type pile soil bearing capacity adjusting device of the present invention is made of a tubular steel member, and the top of described tubular steel member is fixedly connected with top cover, and described top cover is provided with concrete irrigation hole and exhaust inspection eye.
Further, described cavity cylindrical member is drum type, under vertical uniform load q, and can Free Transform.
Further, described concrete irrigation hole is arranged on the top cover top, and extends to basic end face.
Further, be provided with the exhaust inspection eye in the described top cover, and extend to basic end face.
Further, the upside of described top cover is fixedly connected with concrete pouring pipeline and exhaust inspection pipeline, and described concrete pouring pipeline is communicated with cavity, and described exhaust checks that pipeline is communicated with cavity, and the double as anchoring usefulness of pipeline is checked in concrete pouring pipeline and exhaust.
Operating principle of the present invention is: after the construction of stake proceeds to certain altitude apart from design elevation, adjusting device is placed on the stake top, adjusting device can be near Free Transform under the vertical force effect, and concrete irrigation hole and exhaust inspection eye on the top cover extend the foundation slab face.Need by design then, after foundation soil bears a certain amount of load, build the concrete in the described cavity again.Concrete work progress is: the pile foundation injection; Lay cavity backfill type pile soil bearing capacity adjusting device on the stake top; Water and smash the concrete base plate; Superstructure construction when natural ground is stressed when acquiring a certain degree, suspends the loading of superstructure; In cavity, build concrete; After the concrete of after-pouring meets the requirements of intensity, continue the construction of superstructure.
The present invention compares with prior art, and its effect is tangible.The present invention is at the cavity state, and this device is at vertical energy Free Transform; Behind the concrete in having built cavity, can guarantee the transmission of power.Concrete, the present invention utilizes the Free Transform of tubular cavity in the superstructure work progress, and upper load is reached natural ground, makes foundation soil participate in carrying work in advance.When superstructure is constructed to a certain degree, build the concrete in the cavity, pile foundation and foundation soil bore jointly and newly added load this moment.This device is to stake, the distribution of soil bearing capacity, and clear concept, clear and definite, be beneficial to the supporting capacity of the foundation soil of mobilizing to the fullest extent, particularly have the supporting capacity of the foundation soil of good bearing capacity, thereby reduce the quantity of stake, save construction cost.
Description of drawings:
Fig. 1 is the axial section structural representation of cavity backfill type pile soil bearing capacity adjusting device of the present invention.
Fig. 2 is the vertical view of cavity backfill type pile soil bearing capacity adjusting device of the present invention.
The specific embodiment:
Embodiment 1:
As depicted in figs. 1 and 2, cavity backfill type pile soil bearing capacity adjusting device of the present invention is made of a tubular steel member 1, and the top of described tubular steel member 1 is fixedly connected with top cover 2, and described top cover 2 is provided with concrete irrigation hole 41 and exhaust inspection eye 51.
Further, described tubular steel member 1 is drum type.
Further, described tubular steel member 1 is connected and composed up and down by two hollow frustum members.
Further, described concrete irrigation hole 41 is arranged on top cover 2 centers.
Further, be provided with the exhaust inspection eye 51 of two above numbers in the described top cover 2.
Further, be set with ribs 6 on the downside of described top cover 2.
Further, be set with four ribs 6 on the downside of described top cover 2,6 one-tenth intersecting parallels of described four ribs are arranged.
Further, the upside of described top cover 2 is fixedly connected with concrete pouring pipeline 4 and pipeline 1 is checked in exhaust, described concrete pouring pipeline 4 is communicated with concrete irrigation hole 41, described exhaust checks that pipeline 5 is communicated with exhaust inspection eye 51, all has been disposed radially a plurality of anchor slabs 7 on the outer wall of concrete pouring pipeline 4 and exhaust inspection pipeline 5.
The course of work of present embodiment is: after excavation pile construction proceeds to certain altitude apart from design elevation, tubular cavity 1 is placed on stake 3 tops, and form cavity between the stake 3, cavity 1 can be near Free Transform under the vertical force effect, concrete irrigation hole 41 on the top cover 2 and exhaust inspection eye 51 extend to foundation slab 8 above, need by design then, after foundation soil bears a certain amount of load, build the concrete 9 in the described cavity again.Concrete work progress is: the pile foundation injection; Lay cavity backfill type pile soil bearing capacity adjusting device on the stake top; Water and smash the concrete base plate; Superstructure construction when natural ground is stressed when reaching design and needing, suspends the loading of superstructure; In stake 3 tops and tubular cavity, build concrete 9; After the concrete 9 of after-pouring reaches desired strength, continue the construction of superstructure.
Claims (3)
1. cavity backfill type pile soil bearing capacity adjusting device, it is characterized in that: constitute by a tubular steel member, the top of described tubular steel member is fixedly connected with top cover, described top cover is provided with concrete irrigation hole and exhaust inspection eye, described tubular steel member is drum type, under vertical uniform load q, can Free Transform.
2. cavity backfill type pile soil bearing capacity adjusting device as claimed in claim 1 is characterized in that: described concrete irrigation hole is arranged on the top cover top, and extends to basic end face.
3. cavity backfill type pile soil bearing capacity adjusting device as claimed in claim 1 is characterized in that: be provided with described exhaust inspection eye in the described top cover, and extend to basic end face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100390878A CN101608455B (en) | 2008-06-17 | 2008-06-17 | Cavity backfill type pile soil bearing capacity adjusting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100390878A CN101608455B (en) | 2008-06-17 | 2008-06-17 | Cavity backfill type pile soil bearing capacity adjusting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101608455A CN101608455A (en) | 2009-12-23 |
| CN101608455B true CN101608455B (en) | 2011-05-18 |
Family
ID=41482353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100390878A Expired - Fee Related CN101608455B (en) | 2008-06-17 | 2008-06-17 | Cavity backfill type pile soil bearing capacity adjusting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101608455B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104711973A (en) * | 2015-01-07 | 2015-06-17 | 朱奎 | Construction method for small-diameter pile composite foundation |
| CN106592620A (en) * | 2016-12-16 | 2017-04-26 | 上海岩土工程勘察设计研究院有限公司 | Construction method of coordination device for guaranteeing pile-soil co-action |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2221210Y (en) * | 1994-11-09 | 1996-02-28 | 乔墩华 | Pile testing device |
| CN1699706A (en) * | 2005-05-30 | 2005-11-23 | 南京工业大学 | Pile tip displacement regulating device |
-
2008
- 2008-06-17 CN CN2008100390878A patent/CN101608455B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2221210Y (en) * | 1994-11-09 | 1996-02-28 | 乔墩华 | Pile testing device |
| CN1699706A (en) * | 2005-05-30 | 2005-11-23 | 南京工业大学 | Pile tip displacement regulating device |
Non-Patent Citations (5)
| Title |
|---|
| JP特开10-273917A 1998.10.13 |
| JP特开2003-160943A 2003.06.06 |
| JP特开2007-204994A 2007.08.16 |
| 宰金珉等.端承桩复合桩基及其设计方法.《工业建筑》.2008,第38卷(第01期),60-64,73. * |
| 王玉娥等.复合地基承载力设计方法的讨论与改进思路.《宁波高等专科学校学报》.2000,第12卷(第02期),33-38. * |
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| Publication number | Publication date |
|---|---|
| CN101608455A (en) | 2009-12-23 |
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Granted publication date: 20110518 Termination date: 20210617 |
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