CN104088307A - Method for detecting vertical bearing capacity of pile foundation - Google Patents
Method for detecting vertical bearing capacity of pile foundation Download PDFInfo
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- CN104088307A CN104088307A CN201410347026.3A CN201410347026A CN104088307A CN 104088307 A CN104088307 A CN 104088307A CN 201410347026 A CN201410347026 A CN 201410347026A CN 104088307 A CN104088307 A CN 104088307A
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Abstract
The invention provides a method for detecting the vertical bearing capacity of a pile foundation. When vertical static load detection in vertical bearing capacity of the pile foundation is conducted, the method includes the steps that (1) a detecting part used for detecting the bearing capacity is installed at the top of the pile foundation to be detected; (2) a girder used for detection is installed at the top of the detecting part; (3) one or more lifting parts are arranged on the girder used for detection, and a medium container for weight balancing is lifted through the lifting parts; (4) media corresponding to a required load are injected into the medium container; (5) the detecting part is used for conducting vertical bearing capacity detection. When the method is used for conducting single pile pulling resistance detection, the lifting and weight-balancing mode is also used. The method has the advantages of being simple and convenient to operate, high in safety, wide in application range and the like.
Description
Technical field
The present invention is mainly concerned with the engineering detecting field in construction work, refers in particular to a kind of being used for pile foundation is carried out to the method that vertical bearing capacity detects.
Background technology
Along with the developing rapidly of builing industry and marine economy, the continuous propelling of project to enclose sea areas and rolling up of traffic Bridge engineering, adopt the construction work of pile foundation more and more, for the vertical bearing capacity of single pile of pile foundation, require also more and more higher.Meanwhile, along with being widely used of pile foundation, the impact of the ever-changing and human factor of execution conditions, pile quality and single pile bearing capacity are often difficult to effectively be guaranteed in engineering practice.The Important Project quality accident being caused by pile quality reason or bearing capacity of foundation soil reason happens occasionally.For guaranteeing the country and people's property, life security, just should first guarantee the safety of engineering structures, the bearing capacity of pile foundation that particularly belongs to concealed work must meet designing requirement.Therefore, the detection technique for vertical bearing capacity just becomes particularly outstanding and important.
Vertical bearing capacity comprises pile foundation vertical compressive resistance and anti-pulling capacity, traditional pile foundation vertical compressive resistance and anti-pulling capacity detection method have: accumulation load method, common anchored pile-testing method, deep-well in-situ test method, self-anchored method, self-balancing approach and anchor ear method etc., various detection methods all have advantage separately above, but also have, have separately following shortcoming or deficiency, for example:
1, the shortcoming of accumulation load method and deficiency are: required static load balance weight body is large, amount is large, counterweight platform and support heavy so that transportation, to install, remove workload huge, testing staff's labour intensity is greatly, poor stability, detection time is very long, testing cost is very high; And often the restriction because of transportation, place and natural conditions cannot normally detect.
2, the shortcoming of common anchored pile-testing method is: must dig two ~ tetra-anchoring piles in engineering pile surrounding to be checked, this has just significantly increased pile foundation testing cost and has detected time again.
3, the shortcoming of deep-well in situ detection method and deficiency are: can only detect bearing capacity of foundation soil, then by stake footpath, concrete strength of pile and pile quality situation, carry out theoretical calculate, cannot direct-detection to the uplift resistance of the vertical compression bearing capacity of pile foundation, can not to cannot carry out deep-well in-situ test drilled pile, revolve and dig stake, vibropile, luoyang spade stake, pile tube and pile for prestressed pipe and detect, more can not detect for the resistance to plucking of stake.
4, the shortcoming of self-anchored method, self-balancing approach is with not enough: be not suitable for vibropile, hammering castinplace pile, drilled pile, revolve the vertical bearing capacity detection of digging stake, luoyang spade stake, pile for prestressed pipe and prefabricated tubular pile.
5, the shortcoming of anchor ear method is: only can detect for the resistance to plucking of pile tube, and because its method is to apply huge normal pressure in pile tube outside, and make anchor ear method and pile lining generation frictional force (being uplift resistance F).Anchor ear and pressurized equipment processing difficulties are easy to make because local compression is excessive pile crown to destroy simultaneously, and the security reliability of detection is lower, there is no promotional value.
For this reason, separately there is practitioner to propose " a kind of detection method of static load of pile foundation ", although having overcome the first five, this invention plants the shortcoming and defect of detection method, resistance to compression and the resistance to plucking that can be applicable to the vertical bearing capacity in multiple place detect, but because the method is utilized three-dimensional stress principle, for detection of resistance to plucking bar processing and pile crown process must on-the-spot processing in time, and relatively high to the construction technology of dead man and carbon fiber, material requires also very high, to implementation process, causes difficulty and makes to promote difficult.Particularly the static load of pile foundation in river, river, lake, seawater is detected, can testing cost significantly be raise because loading difficulty, also cause enforcement very difficult simultaneously.
Summary of the invention
The technical problem to be solved in the present invention is just: the technical problem existing for prior art, the invention provides a kind of detection method of easy and simple to handle, safe, vertical bearing capacity that the scope of application is wider.
For solving the problems of the technologies described above, the present invention by the following technical solutions:
A detection method for vertical bearing capacity, when the erect static load in carrying out vertical bearing capacity detects, step is:
(1) at the top of pile foundation to be checked, the detection piece for detection of bearing capacity is installed;
(2) at the top of detection piece installation and measuring crossbeam;
(3) detecting with arranging more than one lifting part on crossbeam, by lifting part, lift counterweight medium container containing;
(4) in medium container containing, inject medium corresponding to required detection load;
(5) utilize detection piece to carry out vertical bearing capacity detection.
As a further improvement on the present invention: described detection piece is jack or load box.
As a further improvement on the present invention: described medium is water or sand.
As a further improvement on the present invention: the quantity of described lifting part and medium container containing is all set to even number, centered by pile foundation to be checked, is arranged symmetrically.
The present invention also provides a kind of detection method of vertical bearing capacity, and when the pile foundation uplift resistance in carrying out vertical bearing capacity detects, step is:
(1) side in pile foundation to be checked arranges a supporting component, detection piece is fixedly installed on this supporting component, and as the load-bearing basis of detecting with crossbeam, detect both ends or one end with crossbeam be positioned at intend detecting directly over;
(2) in detection, with the two ends on crossbeam, arrange respectively a lifting part, wherein one end lifts counterweight medium container containing by lifting part, and the other end is connected with the dead man in pile foundation to be checked by lifting part;
(3) in medium container containing, inject medium corresponding to required detection load;
(4), press the detection code requirement of uplift resistance, and according to the actual range at lifting part center, two ends and detection piece center, the maximum of utilizing lever and mechanics principle to calculate detection piece should have the gross weight of top power and mass, carries out the detection of uplift resistance.
As a further improvement on the present invention: described detection piece is jack or load box.
As a further improvement on the present invention: described medium is water or sand.
As a further improvement on the present invention: described supporting component is cast-in-situ steel reinforced concrete pier or plate.
Compared with prior art, the invention has the advantages that: the detection method of vertical bearing capacity of the present invention, adopt the mode of lifting counterweight, utilize in workplace existing medium as counterweight raw material, whole operating process principle is very simple, easy and simple to handle, safe, the scope of application is wider, and accuracy of detection is high; Loading form is more similar to actual bearer form, and still less, testing staff's labour intensity is lower for testing cost.
Accompanying drawing explanation
Fig. 1 is the structural principle schematic diagram of the specific embodiment of the invention 1.
Fig. 2 is the structural principle schematic diagram of the specific embodiment of the invention 2.
Marginal data:
1, pile foundation to be checked; 2, detection piece; 3, detection crossbeam; 4, lifting part; 5, counterweight water container; 6, supporting component; 7, dead man.
The specific embodiment
Below with reference to Figure of description and specific embodiment, the present invention is described in further details.
Embodiment 1: as shown in Figure 1, when the erect static load of the present invention in carrying out vertical bearing capacity detects, step is specific as follows:
(1) detection piece 2, in the installation of the top of pile foundation 1 to be checked for detection of bearing capacity, this detection piece 2 can adopt jack or load box according to actual needs, as long as can complete the demand of loading test.
(2), at the top of detection piece 2, the crossbeam 3 for detection with certain Rigidity and strength is installed, detect the top that is directly arranged in jack or load box 2 with crossbeam 3, configure according to actual needs its length and diameter, to meet the needs of real load detection, be as the criterion.
(3), detecting with arranging more than one lifting part 4 on crossbeam 3, by lifting part 4 liftings medium container containings 5 for counterweight, medium can be selected water or sand or other media of having taken according to concrete application place.Take aqueous medium as example, and this medium container containing 5 can be selected the water container of counterweight water tank or counterweight water bag or other types according to actual needs, as long as can the splendid attire water corresponding with bearing load; 4 of lifting parts can be selected the combination of suspension hook and lanyard or the combination of hanging wheel and stay cord or other form according to actual needs, as long as meet the reliable hanging to medium container containing 5.In order to guarantee the uniformity of load, can further the quantity of lifting part 4 and medium container containing 5 be all set to even number, and be arranged symmetrically centered by pile foundation 1 to be checked.
(4), when reality is used, can be for example, in medium container containing 5, inject medium corresponding to required detection load, to inject the water detecting more than load twice.In other embodiments, should carry out counterweight according to actual conditions, to meet detection standard, be as the criterion.
(5), on the basis of step (4), utilize detection piece 2 to carry out vertical bearing capacity detection.In the present embodiment, oil pump is communicated with jack or load box, and carries out the detection of vertical bearing capacity by both cooperations.
From said process, in whole testing process, the medium of the counterweight medium using for easily taking in application scenario, take aqueous medium as example, while carrying out vertical bearing capacity detection in river, river, lake, seawater, can gather materials on the spot especially, without spending, buy.After detecting, directly discharge the water in medium container containing 5, and remove and detect with crossbeam 3 and detection piece 2, whole testing process easy accessibility, simple in structure, detect fast, safety, accurately.
Embodiment 2: as shown in Figure 2, when the pile foundation uplift resistance of the present invention in carrying out vertical bearing capacity detects (take be applied to one of land pile foundation be example), step is specific as follows:
(1) side in pile foundation 1 to be checked arranges a supporting component 6, and this supporting component 6 can be cast-in-situ steel reinforced concrete pier or plate, detection piece 2 is fixedly installed on this supporting component 6, and as the load-bearing basis of detecting with crossbeam 3.When practical operation, can after reaching design strength, supporting component 6, in its top center position, jack or load box be installed, then at the top of jack or load box, lay and detect with crossbeam 3, make to detect both ends or one end with crossbeam 3 be positioned at intend detecting 1 directly over.
(2) in detection, with the two ends on crossbeam 3, arrange respectively a lifting part 4, wherein one end is by lifting part 4 lifting counterweight medium container containings 5, and the other end is connected with the dead man 7 in pile foundation 1 to be checked by lifting part 4.Medium can be selected water or husky or other media of having taken according to concrete application place.Take aqueous medium as example, and this medium container containing 5 can be selected the water container of counterweight water tank or counterweight water bag or other types according to actual needs, as long as can the splendid attire water corresponding with bearing load; 4 of lifting parts can be selected the combination of suspension hook and lanyard or the combination of hanging wheel and stay cord or other form according to actual needs, as long as meet the reliable hanging to medium container containing 5.
(3), when reality is used, can be for example, in medium container containing 5, inject medium corresponding to required detection load, to inject the water detecting more than load twice.In other embodiments, should carry out counterweight according to actual conditions, to meet detection standard, be as the criterion.
(4), on the basis of step (4), press the detection code requirement of uplift resistance, and according to the actual range at two ends lifting part 4 centers and jack or load box center, the maximum of utilizing lever and mechanics principle to calculate jack or load box should have the gross weight of top power and mass.Oil pump is communicated with jack or load box, and carries out the detection of uplift resistance by both cooperations.
(5) after detecting, directly discharge the water in medium container containing 5, and remove and detect with crossbeam 3 and detection piece 2, whole testing process easy accessibility, simple in structure, detect fast, safety, accurately.
Be appreciated that when the uplift resistance that need to simultaneously carry out many detects, only lifting part 4 and the counterweight medium container containing 5 of some need to be set according to actual needs, and calculate load range.
Below be only the preferred embodiment of the present invention, protection scope of the present invention is also not only confined to above-described embodiment, and all technical schemes belonging under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, should be considered as protection scope of the present invention.
Claims (8)
1. a detection method for vertical bearing capacity, is characterized in that, when the erect static load in carrying out vertical bearing capacity detects, step is:
(1) at the top of pile foundation to be checked, the detection piece for detection of bearing capacity is installed;
(2) at the top of detection piece installation and measuring crossbeam;
(3) detecting with arranging more than one lifting part on crossbeam, by lifting part, lift counterweight medium container containing;
(4) in medium container containing, inject medium corresponding to required detection load;
(5) utilize detection piece to carry out vertical bearing capacity detection.
2. the detection method of vertical bearing capacity according to claim 1, is characterized in that, described detection piece is jack or load box.
3. the detection method of vertical bearing capacity according to claim 1, is characterized in that, described medium is water or sand.
4. according to the detection method of the vertical bearing capacity described in claim 1 or 2 or 3, it is characterized in that, the quantity of described lifting part and medium container containing is all set to even number, centered by pile foundation to be checked, is arranged symmetrically.
5. a detection method for vertical bearing capacity, is characterized in that, when the pile foundation uplift resistance in carrying out vertical bearing capacity detects, step is:
(1) side in pile foundation to be checked arranges a supporting component, detection piece is fixedly installed on this supporting component, and as the load-bearing basis of detecting with crossbeam, detect both ends or one end with crossbeam be positioned at intend detecting directly over;
(2) in detection, with the two ends on crossbeam, arrange respectively a lifting part, wherein one end lifts counterweight medium container containing by lifting part, and the other end is connected with the dead man in pile foundation to be checked by lifting part;
(3) in medium container containing, inject medium corresponding to required detection load;
(4), press the detection code requirement of uplift resistance, and according to the actual range at lifting part center, two ends and detection piece center, the maximum of utilizing lever and mechanics principle to calculate detection piece should have the gross weight of top power and mass, carries out the detection of uplift resistance.
6. the detection method of vertical bearing capacity according to claim 5, is characterized in that, described detection piece is jack or load box.
7. the detection method of vertical bearing capacity according to claim 5, is characterized in that, described medium is water or sand.
8. according to the detection method of the vertical bearing capacity described in claim 5 or 6 or 7, it is characterized in that, described supporting component is cast-in-situ steel reinforced concrete pier or plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410347026.3A CN104088307A (en) | 2014-07-21 | 2014-07-21 | Method for detecting vertical bearing capacity of pile foundation |
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| CN201410347026.3A CN104088307A (en) | 2014-07-21 | 2014-07-21 | Method for detecting vertical bearing capacity of pile foundation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106400856A (en) * | 2016-12-02 | 2017-02-15 | 广州建设工程质量安全检测中心有限公司 | Loading device and method for static load test of pile foundation |
| CN110331745A (en) * | 2019-07-12 | 2019-10-15 | 浙江欧感机械制造有限公司 | The method of plane of disruption engineering media filler is synchronously completed in the detection of self-balancing load box |
| CN111042225A (en) * | 2019-12-25 | 2020-04-21 | 武汉中岩科技股份有限公司 | Device and method for accurately measuring thickness of sediment of cast-in-situ bored pile |
| CN111335370A (en) * | 2020-03-13 | 2020-06-26 | 佛山市强稳新能源有限公司 | Pile foundation bearing capacity detection device |
| CN112832304A (en) * | 2021-01-04 | 2021-05-25 | 广东正强工程检测鉴定有限公司 | Pile foundation bearing capacity detection device and detection method thereof |
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| CN101831925A (en) * | 2010-06-01 | 2010-09-15 | 张百全 | Detection method for static load of pile foundation |
| CN102134859A (en) * | 2010-01-25 | 2011-07-27 | 常州市建筑科学研究院有限公司 | Uplift resistance test device for pre-stressed pipe pile |
| CN102535529A (en) * | 2011-12-08 | 2012-07-04 | 中铁五局（集团）有限公司 | Construction method of self-balancing method pile foundation bearing capacity test device |
| CN203066126U (en) * | 2012-12-31 | 2013-07-17 | 同济大学 | Test device for simulating vertical tension-compression load effect on pile foundations |
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| SU1283299A1 (en) * | 1985-08-07 | 1987-01-15 | Artyushenko Grigorij L | Apparatus for testing pile under static load |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106400856A (en) * | 2016-12-02 | 2017-02-15 | 广州建设工程质量安全检测中心有限公司 | Loading device and method for static load test of pile foundation |
| CN110331745A (en) * | 2019-07-12 | 2019-10-15 | 浙江欧感机械制造有限公司 | The method of plane of disruption engineering media filler is synchronously completed in the detection of self-balancing load box |
| CN111042225A (en) * | 2019-12-25 | 2020-04-21 | 武汉中岩科技股份有限公司 | Device and method for accurately measuring thickness of sediment of cast-in-situ bored pile |
| CN111042225B (en) * | 2019-12-25 | 2021-09-21 | 武汉中岩科技股份有限公司 | Device and method for accurately measuring thickness of sediment of cast-in-situ bored pile |
| CN111335370A (en) * | 2020-03-13 | 2020-06-26 | 佛山市强稳新能源有限公司 | Pile foundation bearing capacity detection device |
| CN112832304A (en) * | 2021-01-04 | 2021-05-25 | 广东正强工程检测鉴定有限公司 | Pile foundation bearing capacity detection device and detection method thereof |
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