CN107268690A - A kind of detection method of carrier pile bearing capacity - Google Patents
A kind of detection method of carrier pile bearing capacity Download PDFInfo
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- CN107268690A CN107268690A CN201710185284.XA CN201710185284A CN107268690A CN 107268690 A CN107268690 A CN 107268690A CN 201710185284 A CN201710185284 A CN 201710185284A CN 107268690 A CN107268690 A CN 107268690A
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/10—Miscellaneous comprising sensor means
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Piles And Underground Anchors (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
The present invention provides a kind of detection method of carrier pile bearing capacity, characterized in that, carrier pile is hammered using weight, by controlling hammering energy pile body is produced vertical displacement, by the shift value and the soil nature of bearing course at pile end of measure, the vertical bearing capacity of the pile is judged.Specific implementation step is：1）The pile crown of carrier pile to needing to detect carries out reinforcement protection；2）Above pile crown, lift free-falling after certain altitude using weight and impact pile crown, by controlling hammering energy pile body is produced downward vertical displacement, measure and record the shift value；3）Repeat step 2）Hammering operation, when the gross energy repeatedly hammered reaches setting value, stop hammering and recording the total displacement numerical value of pile body；4）Carrier equal calculation area A is judged by the soil nature of total displacement numerical value, bearing course at pile endeValue, then according to AeValue calculates the vertical bearing capacity of the pile.The detection method has accurate result, efficient quick and lower-cost feature advantage.
Description
Technical field
The present invention relates to field of civil engineering, the detection method of the bearing capacity of more particularly to a kind of.
Background technology
Foundation as building foundation, its construction quality how, the size of bearing capacity directly influence building
The life-span of thing and safety.Therefore after ground foundation engineering construction is completed, the detection of bearing capacity is carried out to it and is judged between right and wrong
It is often important.At present for the detection method of pile foundation quality, mainly pass through the vertical carrying energy of static load test detection of pier foundation
Power, and aid in examining the integrality of pile body with low-strain dynamic measure method, wherein static load test is usually to utilize preloading or dependence
Anchoring pile etc. provides the mode of counter-force, and because the load required for static load test is very big, therefore either, accumulation load method is still first applied
Work pulling resistant anchor pile, the set-up procedure of its detection method is more, elapsed time is long, in the case where inspecting several piles by random samples will more than ten days very
To the longer time, and the cost and fee charged of detection are very high, and the testing cost of single stake is all more than tens thousand of members.
Carrier pile is the pile foundation technology that a kind of superior in quality and economic advantages developed in recent years are protruded, and its particularity exists
In carrier pile is made up of concrete pile body and carrier, and carrier is the bearing capacity main source of this, and carrier is connected by weight
It is continuous that inserts is carried out to ram so as to form what is be typically made up of concrete, compacting inserts and solid soil, and carrier
Stress and equivalent area and the property of pile-end soil body are closely related.During carrier is formed, the compactness and filler of carrier
Amount is controlled by penetration, and the bearing capacity formula R of carrier pilea=fa×AeIn core parameter Ae
Value is also by penetration and is reinforced soil layer soil nature and draws, therefore for carrier pile, in fixed heavy tamping energy
Under penetration, be carrier pile bearing capacity collection neutralize core body show, further, can be according to this of carrier pile
Characteristic, relevance is found out between pile penetration and its bearing capacity and is actually implemented.
The content of the invention
The problem of present invention is in order to solve above-mentioned and propose, it is therefore intended that a kind of detection of carrier pile bearing capacity is provided
Method, this method for carrier pile characteristic and bearing mechanism, to hammer the method for displacement and by controlling hammering energy so that
Simply, effectively, clearly judge and calculate the bearing capacity of carrier pile, testing result is accurate, excellent effect and cost is relatively low.
The detection method of a kind of carrier pile bearing capacity of the present invention, it is characterised in that hammer carrier pile using weight, pass through
Control hammering energy makes pile body produce vertical displacement, by the shift value and the soil nature of bearing course at pile end of measure, judges the root
The vertical bearing capacity of stake.
The specific implementation step of above-mentioned detection method is：
1）The pile crown of carrier pile to needing to detect carries out reinforcement protection；
2）Above pile crown, lift free-falling after certain altitude using weight and impact pile crown, by controlling hammering energy to make stake
Body produces downward vertical displacement, measures and records the shift value；
3）Repeat step 2）Hammering operation, when the gross energy repeatedly hammered reaches setting value, stop hammering and simultaneously record stake
The total displacement numerical value of body；
4）Carrier equal calculation area A is judged by the soil nature of total displacement numerical value, bearing course at pile endeValue, then according to AeValue is calculated
Draw the vertical bearing capacity of the pile.
In above-mentioned detection method, the weight that hammering energy refers to weight is multiplied by the height of weight drop.
In above-mentioned detection method, above-mentioned control hammering energy include to single hammer energy hole and repeatedly hammer it is total
The energy requirement of energy hole, wherein single hammering is more than the frictional resistance that pile body is produced with surrounding soil, if heavy tamping energy
It is too small, pile body can not be made to produce to bottom offset, while requiring to be less than the maximum impact intensity that pile shaft material is born, i.e. weight is hit
The energy beaten is no more than the feasible value of pile strength, to ensure that pile body is not damaged during hammering；The gross energy repeatedly hammered and the root
The hammering gross energy that carrier pile is used when measuring penetration in construction is closer to better.
Above-mentioned detection method is not limited to carrier pile, additionally it is possible to which other in situ concrete piles and precast concrete pile are carried out
The detection of bearing capacity, the pile foundation of type is held especially for end.
The specific implementation step 1 of above-mentioned detection method）In, it is above-mentioned reinforcement protection is carried out to pile crown to be included on pile crown and add
Neonychium or and add protective case in pile crown periphery, to improve the anti-fight intensity at pile crown position.
The specific implementation step 2 of above-mentioned detection method）In, displacement transducer is installed in pile crown position, to read, record simultaneously
The displacement data of pile body is exported, displacement transducer can set multiple to ensure that measurement is accurate, and displacement transducer is connected by displacement line
Controller, controller can connect computer or independent reading data.
The specific implementation step 2 of above-mentioned detection method）In, the energy of single hammering is not more than 210kN.m, is not damaging stake
It is better closer to 210kN.m on the premise of body；When the energy hole parameter is because measuring penetration in the carrier of construction stake end,
The hammer weight used for 3.5T, fall away from for 6m, the energy values of its single hammering are 210kN.m.
The specific implementation step 3 of above-mentioned detection method）In, the energy of single hammering is not more than 210kN.m；Repeatedly hammer
Gross energy is better closer to 630kN.m on the premise of pile body is not damaged, and is adjusted accordingly according to the weight of used weight
The number of times of hammering and fall away from, hammer into shape it is great should be reduced when 3.5T hammer number or reduction fall away from, hammer again be less than 3.5T when should increase
Hammer number or improve fall away from；When the energy hole parameter is because measuring penetration in the carrier of construction stake end, used
Hammer weight is 3.5T, fallen away from for 6m that the energy values that its single is hammered are 210kN.m, and the total energy numerical quantity of its three times hammerings is
630kN.m。
The specific implementation step 4 of above-mentioned detection method）In, above-mentioned carrier equal calculation area AeValue, according to total displacement number
Value, the soil nature of bearing course at pile end set span, preferably according to following form values.
The specific implementation step 4 of above-mentioned detection method）In, it is above-mentioned according to AeValue calculates the vertical carrying energy of the pile
Power, the calculation formula is Ra=fa×Ae, R in formulaaFor carrier pile vertical bearing capacity of single pile characteristic value, faFor after adjusting for depth
Carrier pile supporting course characteristic value of foundation bearing capacity.
The detection method for bearer properties and bearing mechanism using carrier pile as the end-bearing pile of representative, using with construction stake
Identical hammer mode when holding carrier, but hammering energy is effectively controlled, on the premise of pile quality is not destroyed, appropriate reduction
The hammering energy of single but the number of times of increase hammering, make the gross energy that repeatedly hammers and are adopted when measuring penetration in construction
Hammering gross energy maintains an equal level, i.e., the total displacement settlement values of pile body are measured using the mechanism of the conservation of energy, further according to settlement number
Value and the soil nature of bearing course at pile end judge the bearing capacity of carrier pile.Working procedure and control when the detection method and stake end carrier
Parameter similar processed, bearing mechanism is identical with conservation of energy mechanism, therefore when judging bearing capacity, can be effectively equivalent using carrier
Reference area AeValue, the bearing capacity formula of carrier pile, therefore its testing result is very accurate, the actual bearer ability with stake
Unanimously.
Another technical characterstic of the detection method and advantage are, due to the effect of hammering sedimentation in detection process, to make pile body
Preferably combined with stake end carrier, can for quality problems such as the pile bottom sediment, the pile-end sediments that are likely to occur in work progress
Simply and effectively eliminated so as to avoid pile body sedimentation excessive, further improve pile foundation quality and preferably play holding for end body
Loading capability.
The detection process of this method is simple, requires extremely low to relevant device, and detection speed is fast, efficiency high, with tieing up at a slow speed
The dead-load detection method for holding loading method is compared, without anchoring pile of constructing, roping counterweight, level level preloading, without girder steel and jack
Deng instrument, its construction cost and expense are able to reduction at double.
Embodiment
Technical scheme is further illustrated in conjunction with Engineering Projects.
Engineering Projects 1：Beijing suburbs and counties under the jurisdiction of a large city office building pile foundation engineering, design is carrier pile, designing pile length 8m, stake footpath
600mm, bearing course at pile end is gravelly soil, it is desirable to which ultimate bearing capacity of single pile is 4000kN.Specifically detecting step is：1）It is first before detection
First the pile crown of the carrier pile to needing to detect carries out reinforcement protection, using a height of 700mm two pieces of semicircle stirrup banding pile crowns,
And the felt matter pallet that thickness is 80mm is laid on pile crown surface；2）800mm, pile body install 2 respectively at both sides under stake top surface
Individual displacement transducer, displacement transducer connects controller, controller connection computer by displacement line；3）Above pile crown, use
Weight is 3.5T flat elongated weight alignment pile crown, lifts free-falling impact pile crown after weight 3m, produces pile body downward
Vertical displacement, measure and record this shift value；4）Repeat hammering away from lifting weight according to falling for 3m, hammer 6 times
When hammering gross energy reaches 630kN.m afterwards, stop hammering, the pile body total displacement numerical value that measurement record is obtained is 12mm；4）Root
According to the soil nature of total displacement numerical value He the supporting course of the pile, table look-up and draw carrier equal calculation area AeIt is worth for 3.5 m2；5）Calculate
Carrier pile supporting course characteristic value of foundation bearing capacity f after adjusting for deptha, calculating parameter is that bearing stratum depth corrected Calculation is deep
Spend D=9.0m, native effective unit weight γ0=19.0kN/m3, ηd=4.4, calculation formula is fa=fak+ηd(D-1.5) γ0, calculate knot
Fruit fa=1152.4kPa；6）According to calculation formula Ra=fa×Ae, calculate the vertical limit bearing capacity R of the pilea=
4033kN, meets 4000kN design requirement.
Engineering Projects 2：The newly-built machine room pile foundation engineering of Jixian Tianjin paper plant, design is carrier pile, designs stake
Long 17m, stake footpath 400mm, bearing course at pile end is powder soil horizon, it is desirable to which ultimate bearing capacity of single pile is 1200kN.Specifically detecting step is：
1）The pile crown of carrier pile before detection first to needing to detect carries out reinforcement protection, using a height of 600mm two blocks of semicircle steel
Bind round banding pile crown, and the felt matter pallet for being 50mm in pile crown surface laying thickness；2）700mm, pile body both sides under stake top surface
Place installs 2 displacement transducers respectively, and displacement transducer connects controller, controller connection computer by displacement line；3）In stake
Head top, uses weight for 2T flat elongated weight alignment pile crown, and free-falling impact pile crown after lifting weight 3m makes pile body
Downward vertical displacement is produced, measures and records this shift value；4）Repeat hammering away from lifting weight according to falling for 3m,
Hammering gross energy is 600kN.m after hammering 10 times, stops hammering, and the pile body total displacement numerical value that measurement record is obtained is 17mm；
4）According to the soil nature of total displacement numerical value He the supporting course of the pile, table look-up and draw carrier equal calculation area AeIt is worth for 2.5m2；5）
Calculate the carrier pile supporting course characteristic value of foundation bearing capacity f after adjusting for deptha, calculating parameter is, bearing stratum depth amendment meter
Calculate depth D=19.5m, native effective unit weight γ0=10.0kN/m3, ηd=2, calculation formula is fa=fak+ηd(D-1.5) γ0, calculate
As a result fa=536.8kPa；6）According to calculation formula Ra=fa×Ae, calculate the vertical limit bearing capacity R of the pilea=
1342kN, meets 1200kN design requirement.
Engineering Projects 3：Tianjin Wuqing multi-storey building cell pile foundation engineering, design is carrier pile, designing pile length 8m,
Stake footpath 400mm, bearing course at pile end is powder soil horizon, it is desirable to which ultimate bearing capacity of single pile is 700kN.Specifically detecting step is：1）Detection
The pile crown of the preceding carrier pile first to needing to detect carries out reinforcement protection, using a height of 600mm two pieces of semicircle stirrup bandings
Pile crown, and the felt matter pallet for being 50mm in pile crown surface laying thickness；2）Under stake top surface 700mm, distinguish at pile body both sides
2 displacement transducers are installed, displacement transducer connects controller, controller connection computer by displacement line；3）Above pile crown,
Weight is used for 4T flat elongated weight alignment pile crown, free-falling impact pile crown after lifting weight 1.6m produces pile body
Downward vertical displacement, measures and records this shift value；4）Repeat hammering, hammer away from lifting weight according to falling for 1.6m
Hammering gross energy stops hammering close to 630kN.m after hitting 10 times, and the pile body total displacement numerical value that measurement record is obtained is 35mm；
4）According to the soil nature of total displacement numerical value He the supporting course of the pile, table look-up and draw carrier equal calculation area AeIt is worth for 2.3m2；5）
Carrier pile supporting course characteristic value of foundation bearing capacity fa after adjusting for depth is calculated, calculating parameter is, bearing stratum depth amendment meter
Calculate depth D=9.5m, native effective unit weight γ0=14.0kN/m3, ηd=1.6, calculation formula is fa=fak+ηd(D-1.5) γ0, meter
Calculate result fa=360.8kPa；6）According to calculation formula Ra=fa×Ae, calculate the vertical limit bearing capacity R of the pilea=
829kN, meets design requirement.
Claims (11)
1. a kind of detection method of carrier pile bearing capacity, it is characterised in that hammer carrier pile using weight, by controlling hammering energy
Amount makes pile body produce vertical displacement, by the shift value and the soil nature of bearing course at pile end of measure, judges that the vertical of the pile is held
Loading capability.
2. detection method according to claim 1, it is characterised in that its step is：
1）The pile crown of carrier pile to needing to detect carries out reinforcement protection；
2）Above pile crown, lift free-falling after certain altitude using weight and impact pile crown, by controlling hammering energy to make stake
Body produces downward vertical displacement, measures and records the shift value；
3）Repeat step 2）Hammering operation, when the gross energy repeatedly hammered reaches setting value, stop hammering and simultaneously record stake
The total displacement numerical value of body；
4）Carrier equal calculation area A is judged by the soil nature of total displacement numerical value, bearing course at pile endeValue, then according to AeValue is calculated
Go out the vertical bearing capacity of the pile.
3. detection method according to claim 1 or 2, it is characterised in that the weight that above-mentioned hammering energy refers to weight is multiplied by
The height of weight drop.
4. detection method according to claim 1 or 2, it is characterised in that above-mentioned control hammering energy includes hammering single into shape
The energy hole hit and the gross energy control repeatedly hammered, the energy requirement of wherein single hammering are more than pile body and produced with surrounding soil
Raw frictional resistance, while requiring to be less than the maximum impact intensity that pile shaft material is born, that is, ensures that pile body is not damaged during hammering；It is many
The hammering gross energy that the gross energy of secondary hammering is used when measuring penetration in construction with the root carrier pile is closer to more
It is good.
5. detection method according to claim 1 or 2, it is characterised in that this method is not limited to carrier pile, additionally it is possible to right
Other in situ concrete piles and precast concrete pile carry out the detection of bearing capacity.
6. detection method according to claim 2, it is characterised in that above-mentioned steps 1）In, it is above-mentioned that reinforcing guarantor is carried out to pile crown
Shield be included on pile crown add neonychium or and add protective case in pile crown periphery.
7. detection method according to claim 2, it is characterised in that above-mentioned steps 2）In, displacement biography is installed in pile crown position
Sensor, to read, record and export the displacement data of pile body.
8. detection method according to claim 2, it is characterised in that above-mentioned steps 2）In, the energy of single hammering is not more than
210kN.m。
9. detection method according to claim 2, it is characterised in that above-mentioned steps 3）In, the energy of single hammering is not more than
210kN.m, the gross energy repeatedly hammered is better closer to 630kN.m.
10. detection method according to claim 2, it is characterised in that above-mentioned steps 4）In, above-mentioned carrier Equivalent Calculation face
Product AeValue, span is set according to the soil nature of total displacement numerical value, bearing course at pile end.
11. detection method according to claim 2, it is characterised in that above-mentioned steps 4）In, it is above-mentioned according to AeValue is calculated
The vertical bearing capacity of the pile, the calculation formula is Ra=fa×Ae, R in formulaaFor carrier pile vertical bearing capacity of single pile characteristic value,
faFor the carrier pile supporting course characteristic value of foundation bearing capacity after adjusting for depth.
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| CN201710185284.XA CN107268690B (en) | 2017-03-25 | 2017-03-25 | Method for detecting bearing capacity of carrier pile |
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| CN201710185284.XA CN107268690B (en) | 2017-03-25 | 2017-03-25 | Method for detecting bearing capacity of carrier pile |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110219293A (en) * | 2019-04-30 | 2019-09-10 | 魏井辉 | A kind of testing of bearing capacity of composite foundation device and detection method |
| CN115637695A (en) * | 2022-10-25 | 2023-01-24 | 中建四局土木工程有限公司 | Construction method of PHC prestressed high-strength concrete pipe pile |
| CN116136149A (en) * | 2023-02-21 | 2023-05-19 | 广州市市政工程设计研究总院有限公司 | Novel underwater mechanical rock drilling process parameter rapid determination method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110219293A (en) * | 2019-04-30 | 2019-09-10 | 魏井辉 | A kind of testing of bearing capacity of composite foundation device and detection method |
| CN115637695A (en) * | 2022-10-25 | 2023-01-24 | 中建四局土木工程有限公司 | Construction method of PHC prestressed high-strength concrete pipe pile |
| CN116136149A (en) * | 2023-02-21 | 2023-05-19 | 广州市市政工程设计研究总院有限公司 | Novel underwater mechanical rock drilling process parameter rapid determination method |
| CN116136149B (en) * | 2023-02-21 | 2023-10-31 | 广州市市政工程设计研究总院有限公司 | Novel underwater mechanical rock drilling process parameter rapid determination method |
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