CN108625412A - A kind of long-short pile combined enclosure structure stress and deformation on-the-spot test method - Google Patents
A kind of long-short pile combined enclosure structure stress and deformation on-the-spot test method Download PDFInfo
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- CN108625412A CN108625412A CN201810625605.8A CN201810625605A CN108625412A CN 108625412 A CN108625412 A CN 108625412A CN 201810625605 A CN201810625605 A CN 201810625605A CN 108625412 A CN108625412 A CN 108625412A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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Abstract
A kind of long-short pile combined enclosure structure stress and deformation on-the-spot test method, include the following steps：（1）Determine the position of experiment pile cutoff；（2）Determine the combination of test pile；（3）Determine the length of test pile；（4）Pile body deformation and deformation measurement；（5）Data acquire.Solve the problems, such as long-short pile combined enclosure structure stress and deformation on-the-spot test well.The test device that the present invention uses includes test pile, steel reinforcement cage, inclinometer pipe, inclinometer, embedded type concrete strain gauge and data collecting instrument.Long-short pile combined enclosure structure stress of the present invention and deformation on-the-spot test method provide effective research technique for the stressing conditions and stress transfer mechanism for studying long-short pile combined enclosure structure pile.Test method of the present invention, can accurately measure internal force and the displacement of long-short pile combined enclosure structure, and effective information is provided for long-short pile combined enclosure structure design, and design method is simple and practical, have good application and popularization value.
Description
Technical field
The present invention relates to a kind of long-short pile combined enclosure structure stress and deformation on-the-spot test method, the tests of dependent territory wood engineering
Method field.
Background technology
The rapid development utilized with urban underground space, the requirement to related foundation pit enclosure technology also correspondingly improve.
Foundation pit enclosure structure is usually provisional structure will cause the waste of human and material resources if excessively pursuing safety.
Currently, the method for the foundation pit enclosure design isometric stake of generally use, but in the moment of flexure of the following pile body in foundation pit bottom surface with depth
Degree increases and is gradually reduced, and the flexural loading capacity of pile body lower part does not obtain adequately when being laid out pile by the form of isometric stake
It plays, is also unable to fully the principle using soil condition and pile soil common action, causes increase and the project cost of duration
Waste.So it is increasingly common in engineering using long-short pile combined enclosure structure, but at present still without offer in specification
The method of long-short pile combined enclosure structure design, and mostly using model test, but model test asking due to the likelihood ratio
Topic can not accurately reflect practical long-short pile combined enclosure structure stress and deformation.Therefore, a kind of rational length of simplicity is found
Stake combined enclosure structure stress and deformation on-the-spot test method, be one has the technical issues of engineering application value very much.
Invention content
The object of the present invention is to which in view of the above existing problems in the prior art, the present invention provides a kind of long-short pile groups to surround
Protection structure stress and deformation on-the-spot test method.
To achieve the goals above, the present invention provides the following technical solutions：A kind of long-short pile combined enclosure structure stress and
On-the-spot test method is deformed, steps are as follows：
(1) position for determining experiment pile cutoff determines examination according to the physical location and excavating condition of live foundation pit enclosure structure
Test the position of stake；The foundation pit enclosure structure is cast-in-situ bored pile；
(2) determine that the combination of test pile, the combination of test pile are：One long stake, one stub, a long stake
Two stubs, three stubs of a long stake, two long stakes, two stubs；
(3) length for determining test pile is lengthened or shortened on the basis of isometric stake is long originally；
(4) pile body stress and deformation measurement；
(5) data acquire.
The pile body stress and deformation measurement include：
(1) concrete embedded type strain gauge spacing and number are designed：According to the long determining concrete embedded type strain gauge of stake
Spacing and number；
(2) embedded type concrete strain gauge is bound：Embedded type concrete strain gauge is bound according to the spacing of design in steel
On muscle cage, the position of embedded type concrete strain gauge binding needs on same root reinforcing bar；Strain gauge conducting wire end position needs to use
Electric adhesive tape prevents terminal stud to be contaminated and cannot be with the good connection of data collecting instrument as safeguard measure；Embedded type concrete
Strain gauge conducting wire need to continue along steel reinforcement cage toward steel reinforcement cage top, and exceed steel reinforcement cage 2-3m；
(3) inclinometer pipe is bound：By the effective thin wire binding of deviational survey on steel reinforcement cage, the position of binding is opposite in strain gauge
On position；Inclinometer pipe both ends need to do Seal treatment, prevent inclinometer pipe from being blocked by sundries such as silts；Inclinometer pipe top need to be shorter than steel
Muscle cage top end 40-50cm, inclinometer pipe top is destroyed when preventing pile crown from abolishing；
(4) steel reinforcement cage is hung：The steel reinforcement cage that inclinometer pipe and strain gauge are tied up will have been bound to hang onto in the stake holes of pore-forming；
(5) pouring underwater concrete：The pouring underwater concrete in the stake holes for having hung steel reinforcement cage；
(6) pile crown is abolished：The pile crown of test pile is abolished into 0.8-1m, exposes the conducting wire of inclinometer pipe and strain gauge；
(7) inclinometer pipe lengthens：Each inclinometer pipe of test pile lengthens 1.5m；
(8) Guan Liang is constructed：After pile crown is abolished and lengthened with inclinometer pipe, Guan Liang construction is carried out.
The data collection steps are：
(1) embedded type concrete strain gauge conducting wire end is connected on data collecting instrument, record foundation pit often excavates one layer of soil
The reading of layer, test are complete until excavation of foundation pit；
(2) inclinometer is put into inclinometer pipe, a data is recorded every 0.5m.
The method includes test pile, steel reinforcement cage, inclinometer pipe, inclinometer, embedded type concrete strain using test device
Meter and data collecting instrument.The embedded type concrete strain gauge is bound by the requirement spacing of design on steel reinforcement cage；The deviational survey
Effective thin wire binding is on steel reinforcement cage, and the position of binding is on the opposite position of embedded type concrete strain gauge；Binding is good to survey
The steel reinforcement cage of inclined tube and embedded type concrete strain gauge is hung onto in the stake holes of pore-forming；Embedded type concrete strain gauge end is logical
Conducting wire is crossed to connect with data collecting instrument.
The inclinometer is ZX-806B type inclinometers；The embedded type concrete strain is calculated as BX120-5AA.
The invention has the advantages that using provided by the invention kind of long-short pile combined enclosure structure stress and deformation scene
Test method can accurately measure internal force and the displacement of long-short pile combined enclosure structure, be long-short pile combined enclosure structure design
Effective information is provided, design method is simple and practical, has good application and popularization value.
Description of the drawings
Fig. 1 is test method flow chart of the present invention；
Fig. 2 is certain building site foundation pit enclosure plan view；
Fig. 3 is test pile strain gauge and inclinometer pipe layout drawing；
Fig. 4 is the vertical view of Fig. 3；
Fig. 5 is the a-quadrant enlarged drawing of Fig. 4；
Fig. 6 is experiment pile cutoff floor map；
Fig. 7 is A1 sections of test pile layout drawings in Fig. 2；
Fig. 8 is A2 sections of test pile layout drawings in Fig. 2；
Fig. 9 is A3 sections of test pile layout drawings in Fig. 2；
Figure 10 is ZX-806B type inclinometer movable probe schematic diagrames.
In figure：1 is test pile, and 2 be steel reinforcement cage, and 3 be Guan Liang, and 4 be inclinometer pipe, and 5 be embedded type concrete strain gauge, and 6 are
Electric wire, 7 be inclinometer pipe groove, and 8 be cement mixing pile, and 9 be foundation pit, and 10 be bottom of foundation ditch, and 11 be high guide wheel, and 12 be low guide wheel,
13 be cable.
Specific implementation mode
In conjunction with the drawings and specific embodiments to a kind of long-short pile combined enclosure structure stress proposed by the present invention and deformation
On-the-spot test method further illustrates that the embodiment is merely to illustrate the present invention and not limitation of the present invention.
Nanchang basement foundation ditch flat shape is rectangle, foundation pit long 122m, wide 58m, and excavation of foundation pit depth is
11.9m, pattern foundation pit supporting structure floor map are as shown in Figure 2.The present embodiment engineering makees building enclosure using cast-in-situ bored pile, and pile body is straight
Diameter 1m, centre-to-centre spacing 0.95m, a length of 19.80m of stake；Setting twice reinforced concrete support is set up in below ground 1.5m respectively
And at the positions 7.2m.
A kind of long-short pile combined enclosure structure stress of the present embodiment and deformation on-the-spot test method, as shown in Figure 1, include with
Lower step：
(1) position that experiment pile cutoff is determined according to the practical pattern foundation pit supporting structure situation in scene, as shown in Fig. 2, choosing 6 test piles
Section is divided into the areas A experiment pile cutoff and the areas B experiment pile cutoff.
(2) combination of test pile is determined：The areas A experiment pile cutoff is divided into A1 (one is long and the other is short), A2 (unexpected misfortune), A3
(length three is short)；The areas B experiment pile cutoff is divided into B1 (one is long and the other is short), B2 (unexpected misfortune), B3 (length three is short).Fig. 7, Fig. 8, Fig. 9
For be respectively the areas A test pile combination sectional view
(3) length of test pile is determined：The areas A test pile segment length the stake a length of 19.80m of stake, a length of 17.80m of stub stake；The areas B
Test pile segment length's stake a length of 19.80m of stake, a length of 16.80m of stub stake.
(4) Internal forces and deformation measurement：
A, embedded type concrete strain gauge spacing is designed：As shown in Figures 2 and 3, the areas A test pile segment length stake is tied up every 1.5m
An embedded type concrete strain gauge 5 is pricked, 13 are installed per root long stake；Stub binds an embedded type concrete every 1.5m and answers
Become meter 5, each stub installs 10；The areas B test pile segment length stake binds an embedded type concrete strain gauge 5 every 1.5m, often
Root long stake installs 13；Stub binds an embedded type concrete strain gauge 5 every 1.5m, and each stub installs 9；Strain gauge
Conducting wire need to continue along steel reinforcement cage toward steel reinforcement cage top, and exceed steel reinforcement cage 2-3m；The specification that embedded type concrete strain gauge 5 is selected
Strain gauge conducting wire is connected data collecting instrument and reset by model BX120-5AA.
B, inclinometer pipe is bound：As shown in figure 3, the length of inclinometer pipe is 2m, by connector by 4 spreading of inclinometer pipe, inclinometer pipe
Both ends need to make Seal treatment, prevent the sundries such as silt from falling into pipe internal congestion pipeline；The effective thin wire of the deviational survey connected is tied up
It pricks on the opposite reinforcing bar of strain gauge；As shown in Figure 4, Figure 5 and Figure 6, the groove 7 of inclinometer pipe should be made to arriving base when inclinometer pipe is bound
On the inside of crater wall；Inclinometer pipe top need to be shorter than steel reinforcement cage top 40-50cm, prevent inclinometer pipe when broken pile head from being destroyed.
C, steel reinforcement cage is hung：The steel reinforcement cage for having bound inclinometer pipe 4 and embedded type concrete strain gauge 5 is hung onto into pore-forming
Stake holes in and pouring underwater concrete；
D, pile crown is abolished：The pile crown of test pile is abolished into 0.8m, exposes the conducting wire of inclinometer pipe and strain gauge；
E, inclinometer pipe lengthens：Each inclinometer pipe of test pile lengthens 1.5m；
F, Guan Liang is constructed：As shown in figure 3, after pile crown is abolished and lengthened with inclinometer pipe, carries out Guan Liang 3 and construct and expose deviational survey
Pipe 4 and embedded type concrete strain gauge conducting wire 6.
(5) data acquire
A, 6 end of concrete embedded type strain gauge conducting wire is connected on data collecting instrument, foundation pit excavates in three times, excavates deep
Degree is respectively 3.2m, 4m, 4.7m；Record foundation pit often excavates the reading of one layer of soil layer, and test is complete until excavation of foundation pit；
B, as shown in Figure 10, the movable probe of inclinometer is put into inclinometer pipe, the model ZX-806B types of inclinometer are surveyed
The high guide wheel 11 of oblique instrument, movable probe is directed at inclinometer pipe at the groove 7 on the inside of foundation pit walls, stablizes decentralization until from inclinometer pipe
Until the 20cm of bottom；Zeros data, it is primary toward pull-up every 0.5m after stablizing, after stablizing, record data.
Measurement data acquisition is until excavation of foundation pit is complete.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any, equivalent replacement, improvement for being done etc. are all included in the scope of protection of the present invention.
Claims (5)
1. a kind of long-short pile combined enclosure structure stress and deformation on-the-spot test method, which is characterized in that the method step is such as
Under：
（1）Determine that the position of experiment pile cutoff determines test pile according to the physical location and excavating condition of live foundation pit enclosure structure
Position；The foundation pit enclosure structure is cast-in-situ bored pile；
（2）Determine the combination of test pile, the combination of test pile is one of following manner：One long stake, one stub,
One long stake, two stubs, three stubs of a long stake, two long stakes, two stubs；
（3）The length for determining test pile is lengthened or shortened on the basis of isometric stake is long originally；
（4）Pile body stress and deformation measurement；
（5）Data acquire.
2. a kind of long-short pile combined enclosure structure stress according to claim 1 and deformation on-the-spot test method, feature
It is, the pile body stress and deformation measurement include：
（1）Design embedded type concrete strain gauge spacing：According to the spacing and number of the long determining embedded type concrete strain gauge of stake；
（2）Bind embedded type concrete strain gauge：Embedded type concrete strain gauge is bound according to the spacing of design in steel reinforcement cage
On, the position of concrete embedded type strain gauge binding needs on same root reinforcing bar；Strain gauge conducting wire end position needs electricity consumption glue
Band prevents terminal stud to be contaminated and cannot be with the good connection of data collecting instrument as safeguard measure；Strain gauge conducting wire need to be along steel
Muscle cage continues toward steel reinforcement cage top, and exceeds steel reinforcement cage 2-3m；
（3）Bind inclinometer pipe：By deviational survey effective thin wire binding on steel reinforcement cage, the position of the binding position opposite in strain gauge
On；Inclinometer pipe both ends need to do Seal treatment, prevent inclinometer pipe from being blocked by sundries；Inclinometer pipe top need to be shorter than steel reinforcement cage top
40-50cm；
（4）Hang steel reinforcement cage：The steel reinforcement cage that inclinometer pipe and strain gauge are tied up will have been bound to hang onto in the stake holes of pore-forming and be perfused
Underwater concrete；
（5）Pile crown is abolished：The pile crown of test pile is abolished into 0.8-1m, exposes the conducting wire of inclinometer pipe and strain gauge；
（6）Inclinometer pipe lengthens：Each inclinometer pipe of test pile lengthens 1.5m；
（7）Guan Liang is constructed：After pile crown is abolished and lengthened with inclinometer pipe, Guan Liang construction is carried out.
3. a kind of long-short pile combined enclosure structure stress according to claim 1 and deformation on-the-spot test method, feature
It is, the data collection steps are：
（1）Embedded type concrete strain gauge conducting wire end is connected on data collecting instrument, record foundation pit often excavates one layer of soil layer
Reading, test are complete until excavation of foundation pit；
（2）Inclinometer is put into inclinometer pipe, a data are recorded every 0.5m.
4. a kind of long-short pile combined enclosure structure stress according to claim 1 and deformation on-the-spot test method, feature
Be, the method using test device include test pile, steel reinforcement cage, inclinometer pipe, inclinometer, embedded type concrete strain gauge and
Data collecting instrument；The embedded type concrete strain gauge is bound by the requirement spacing of design on steel reinforcement cage；The deviational survey is effective
Thin wire is bound on steel reinforcement cage, and the position of binding is on the opposite position of embedded type concrete strain gauge；Inclinometer pipe is bound
It is hung onto in the stake holes of pore-forming with the steel reinforcement cage of embedded type concrete strain gauge；Embedded type concrete strain gauge end is by leading
Line is connect with data collecting instrument.
5. a kind of long-short pile combined enclosure structure stress according to claim 4 and deformation on-the-spot test method, feature
It is, the inclinometer is ZX-806B type inclinometers；The embedded type concrete strain is calculated as BX120-5AA.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810625605.8A CN108625412A (en) | 2018-06-18 | 2018-06-18 | A kind of long-short pile combined enclosure structure stress and deformation on-the-spot test method |
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| CN201810625605.8A CN108625412A (en) | 2018-06-18 | 2018-06-18 | A kind of long-short pile combined enclosure structure stress and deformation on-the-spot test method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112197806A (en) * | 2020-09-25 | 2021-01-08 | 中煤科工开采研究院有限公司 | Method for installing equipment for monitoring movement deformation, hydrology and stress of coal mining subsidence area |
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| CN207062955U (en) * | 2017-04-20 | 2018-03-02 | 中南勘察设计院（湖北）有限责任公司 | The foundation pit supporting construction that a kind of thick long stake is combined with thin stub |
| CN108035388A (en) * | 2018-01-17 | 2018-05-15 | 杭州鲁尔物联科技有限公司 | Friction pile condition monitoring system and method |
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2018
- 2018-06-18 CN CN201810625605.8A patent/CN108625412A/en active Pending
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|---|---|---|---|---|
| CN102011415A (en) * | 2010-10-26 | 2011-04-13 | 珠海市建设工程质量监督检测站 | Method and device for detecting strain/stress of pile body by prestress pipe file field static load test |
| CN207062955U (en) * | 2017-04-20 | 2018-03-02 | 中南勘察设计院（湖北）有限责任公司 | The foundation pit supporting construction that a kind of thick long stake is combined with thin stub |
| CN108035388A (en) * | 2018-01-17 | 2018-05-15 | 杭州鲁尔物联科技有限公司 | Friction pile condition monitoring system and method |
Non-Patent Citations (1)
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| 石钰锋等: ""紧邻铁路偏压基坑围护结构变形与内力测试分析"", 《岩石力学与工程学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112197806A (en) * | 2020-09-25 | 2021-01-08 | 中煤科工开采研究院有限公司 | Method for installing equipment for monitoring movement deformation, hydrology and stress of coal mining subsidence area |
| CN112197806B (en) * | 2020-09-25 | 2021-08-06 | 中煤科工开采研究院有限公司 | Method for installing equipment for monitoring movement deformation, hydrology and stress of coal mining subsidence area |
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Application publication date: 20181009 |