CN105386473A - Method for detecting pile foundation post grouting quality based on multi-point ejection type sensor measurement technology - Google Patents
Method for detecting pile foundation post grouting quality based on multi-point ejection type sensor measurement technology Download PDFInfo
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- CN105386473A CN105386473A CN201510672906.2A CN201510672906A CN105386473A CN 105386473 A CN105386473 A CN 105386473A CN 201510672906 A CN201510672906 A CN 201510672906A CN 105386473 A CN105386473 A CN 105386473A
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- reinforcing cage
- slip casting
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000005516 engineering process Methods 0.000 title abstract description 8
- 238000005259 measurement Methods 0.000 title abstract description 4
- 239000002689 soil Substances 0.000 claims abstract description 25
- 238000007569 slipcasting Methods 0.000 claims description 24
- 230000003014 reinforcing effect Effects 0.000 claims description 23
- 210000003205 muscle Anatomy 0.000 claims description 19
- 238000001514 detection method Methods 0.000 claims description 18
- 239000002002 slurry Substances 0.000 claims description 15
- 238000000691 measurement method Methods 0.000 claims description 8
- 238000013461 design Methods 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000004064 recycling Methods 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 abstract 4
- 239000011440 grout Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 12
- 230000008859 change Effects 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 239000004568 cement Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 238000007596 consolidation process Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 229920002472 Starch Polymers 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 235000019698 starch Nutrition 0.000 description 3
- 239000008107 starch Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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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- 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)
Abstract
The invention discloses a method for detecting pile foundation post grouting quality based on a multipoint ejection type sensor measurement technology, which comprises the following steps of (1) installing a sensor: fixing a sensor with a hydraulic cylinder or a pneumatic cylinder on a main rib of the reinforcement cage, wherein the acquisition signal input end of an external acquisition instrument is connected with the output end of the sensor; the sensors are arranged upwards along the bottom of the reinforcement cage; (2) fixedly mounting a reinforcement cage in a pile hole of a pre-dug cast-in-place pile; (3) after the reinforcement cage is placed in place, the sensor is ejected out by using a hydraulic cylinder or a pneumatic cylinder, and the ejected sensor is contacted with the hole wall of the cast-in-place pile; (4) pouring concrete into the pile hole of the cast-in-place pile; (5) reading the numerical values measured by the sensors at all depths before grouting by using an acquisition instrument; (6) grouting; (6) after grouting, reading the numerical values measured by the sensors at all depths after grouting by using an acquisition instrument; the distribution state of the grout in the soil body on the pile side can be obtained through the comparison of numerical values before and after grouting.
Description
Technical field
The present invention relates to a kind of method based on multiple spot ejecting type sensor measurement techniques detection of pier foundation post jacking quality, belong to bridge pile foundation detection field.
Background technology
Pile foundation post-grouting technology injects the slurries that can play cementation solidifying effect by the soil body to stake end and stake side, strengthen, solidify the soil body of stake end and stake side, can effectively reduce stake long, improve pouring pile bearing capacity, reduce pile body settling amount, the reduction of erection time, reduction castinplace pile the advantage such as construction costs, pile foundation post-grouting technology is with the obvious advantage, application prospect is good, is widely applied in recent years in fields such as traffic, building, water conservancies.
But, because pile foundation belongs to concealed work, pile foundation post grouting construction quality is difficult to judge, the changeable complexity of geological conditions, the slurry formula preset in slip casting process, grouting pressure, mud jacking amount is after mud jacking operation is implemented, the evaluation difficulty of its concrete grouting result is very large, mainly evaluate stake by measurement ultimate bearing capacity of single pile up till now whether to meet design requirement, the method can only be randomly drawed a part and carry out representativeness detection, the evaluation of pile foundation slip casting effect in enormous quantities cannot be applicable to, and cannot directly evaluate grouting result, indirectly can only reflect grouting result.In existing detection means, for the consolidation effect of slurries bottom pile body and in pile peripheral earth, not yet there is preferable quality detection method at present.
Summary of the invention
In order to overcome the existing above-mentioned shortcoming for existing with the detection method of the consolidation effect of slurries in pile peripheral earth bottom pile body, the invention provides a kind of method based on multiple spot ejecting type sensor measurement techniques detection of pier foundation post jacking quality, the method adopts multipoint mode pressure sensor measuring technique, utilize the method for designing of hydraulic pressure or air pressure liftout attachment, can detect the grouting result of pile foundation post-grouting technology, the slurries distribution situation in the soil body, thus provide detection data for the effect evaluating pile foundation post jacking; In addition for the construction characteristic of pile foundation, utilize the liftout attachment method for designing of hydraulic pressure or air pressure, greatly improve the contact effect of sensor and hole wall, thus improve certainty of measurement and accuracy.
The technical solution used in the present invention is:
Based on the method for multiple spot ejecting type sensor measurement techniques detection of pier foundation post jacking quality, it is characterized in that: comprise the steps:
(1), sensor installation: the sensor of band hydraulic cylinder or pneumatic cylinder is fixed on the main muscle of reinforcing cage, described sensor is fixedly connected with the piston rod of hydraulic cylinder or pneumatic cylinder, the output of the collection signal sensor input connection of outside Acquisition Instrument; Multiple sensor is upwards arranged along the bottom of reinforcing cage, the spacing of adjacent sensors at 50cm ~ 100cm, and from the lower arrangement from upper sensor by close to dredging; Measuring cable, hydraulic tube or pneumatic tube is bundled in by main muscle by steel wire;
(2), install reinforcing cage: install reinforcing cage at the stake holes internal fixtion of the castinplace pile dug in advance, described reinforcing cage comprises by many vertical settings and the main muscle of circular array and horizontal interval are welded on the multiple hoop stirrups on described main muscle;
(3), the ejecting of sensor: after reinforcing cage is in place, utilize hydraulic cylinder or pneumatic cylinder to be ejected by sensor, the sensor after ejecting contacts with the hole wall of castinplace pile;
(4) toward concreting in the stake holes of castinplace pile;
(5), after concrete reach design strength 70% or more, the numerical value that before utilizing Acquisition Instrument to read slip casting, the sensor of each degree of depth records;
(6), slip casting;
(6), slip casting terminates, after maintenance is reinforced, and the numerical value that after recycling Acquisition Instrument reads slip casting, the sensor of each degree of depth records; The distribution of slurries in Pile side soil body can be obtained by the contrast of numerical value before and after slip casting.
Described sensor is pressure sensor or Ph sensor.
Described hydraulic cylinder or pneumatic cylinder are fixed on main muscle by fixed support.
In the present invention, pile foundation post-grouting technology refers at bored pile piling and after reaching some strength, by being embedded in the madjack pipe in stake week or pile body in advance, use in the high-pressure injection pump slurries pressure pile end soil layer that can play cementation solidifying effect and pile peripheral earth, thus sediment of the hole bottom, bearing course at pile end and mud cake around pile utilize the infiltration of slurries, fill, densification, the effect such as splitting and consolidation, change physical property and the mechanical state of original soil body, the intensity of pile-end soil and Pile side soil is improved, improving end resistance and frictional force in side-pile in varying degrees, and then reduce the settling amount of stake, improve the bearing capacity of stake.
Pile foundation post jacking, after slurries inject, by detecting undisturbed soil and mud composite soil to the change of pile body pressure, and the pile body height that cement paste arrives, and then reflects the general effect of mud jacking.Utilize multipoint mode pressure sensor to test out composite soil to the change value of pressure of pile body and instead starch the height reached, reflect the grouting result of cement paste.
For pile foundation post jacking reinforcing scope, the Detection of content using multipoint mode pressure sensor measuring technique to carry out grouting result mainly comprises:
1, novel multipoint mode sensor mainly utilizes self conductive rubber, and the elasticity of conductive rubber is fixed on vertical main muscle by fixed support, and sensor ejects the rear free elastic deformation utilizing rubber, allows it naturally be adjacent to boring pile lining.
2, in pile foundation post jacking process, the soil body of the mud skin soil in the above certain altitude of stake end and mud skin soil periphery is reinforced within the scope of one fixed width, and then affect its pressure to pile body, improve pile side resistance, adopt multipoint mode pressure sensor can detect slurries stake week distribution and instead starch height, thus evaluation slip casting is to the improvement effect of pile side friction.
Beneficial effect of the present invention is embodied in:
1, compared with existing detection method, multipoint mode pressure sensor can accurately measure the change of the soil body to the pressure of pile body, when not needing special device, after can accurately measuring mud jacking, soil pressure is to the change of pile body pressure, can detect the mud jacking scope that stake side is interior in a big way, detection efficiency improves greatly.
2, novel multipoint mode pressure sensor has easy for installation, adopts fluid pressure type extrusion method or cylinder ejector apparatus design method, and device is simple and firm, is convenient to on-the-spot construction.
Accompanying drawing explanation
Fig. 1 a is multipoint mode pressure sensor schematic diagram (before ejecting) of the present invention.
Fig. 1 b is multipoint mode pressure sensor schematic diagram of the present invention (after ejecting).
Fig. 2 a is that sensor of the present invention ejects front schematic diagram.
Fig. 2 b is that sensor of the present invention ejects rear schematic diagram.
Fig. 3 is the cross-sectional drawing of reinforcing cage of the present invention.
Fig. 4 a is the A-A sectional view of Fig. 3.
Fig. 4 b is the B-B sectional view of Fig. 3.
Fig. 5 is the technology of the present invention implementation process schematic diagram.
Detailed description of the invention
With reference to Fig. 1 a to Fig. 5, based on the method for multiple spot ejecting type sensor measurement techniques detection of pier foundation post jacking quality, comprise the steps:
(1), sensor installation: the sensor 1 of band hydraulic cylinder or pneumatic cylinder 2 is fixed on the main muscle 51 of reinforcing cage 5, described sensor 1 is fixedly connected with the piston rod 21 of hydraulic cylinder or pneumatic cylinder, the output of the collection signal sensor input connection 1 of outside Acquisition Instrument 7; Multiple sensor 1 is upwards arranged along the bottom of reinforcing cage 5, the spacing of adjacent sensors 1 at 50cm ~ 100cm, and from the lower arrangement from upper sensor by close to dredging; Measuring cable, hydraulic tube or pneumatic tube 4 is bundled in by main muscle by steel wire;
(2), install reinforcing cage: install reinforcing cage 5 at the stake holes internal fixtion of the castinplace pile dug in advance, described reinforcing cage 5 comprises by many vertical settings and the main muscle 51 of circular array and horizontal interval are welded on the multiple hoop stirrups 52 on described main muscle;
(3), the ejecting of sensor: after reinforcing cage 5 is in place, utilize hydraulic cylinder or pneumatic cylinder 2 to be ejected by sensor 1, the sensor 1 after ejecting contacts with the hole wall 6 of castinplace pile;
(4) toward concreting in the stake holes of castinplace pile;
(5), after concrete reach design strength 70% or more, the numerical value that before utilizing Acquisition Instrument 7 to read slip casting, the sensor of each degree of depth records;
(6), slip casting;
(6), slip casting terminates, after maintenance is reinforced, and the numerical value that after recycling Acquisition Instrument 7 reads slip casting, the sensor of each degree of depth records; The distribution of slurries in Pile side soil body can be obtained by the contrast of numerical value before and after slip casting.
Described sensor 1 is pressure sensor or Ph sensor.
Described hydraulic cylinder or pneumatic cylinder 2 are fixed on main muscle 51 by fixed support 3.
In the present embodiment, pile foundation post jacking, after slurries inject, by detecting undisturbed soil and mud composite soil to the change of pile body pressure, and the pile body height that cement paste arrives, and then reflects the general effect of mud jacking.Utilize multipoint mode pressure sensor to test out composite soil to the change value of pressure of pile body and instead starch the height reached, reflect the grouting result of cement paste.
Detection is carried out to pile foundation post jacking and adopts multipoint mode pressure sensor measuring technique, utilize the method for designing of hydraulic pressure or air pressure liftout attachment, directly carry out slip casting effect test to before and after pile foundation slip casting.
1, when tying up reinforcing cage, will be fixed on main muscle with hydraulic jack (band cylinder) multipoint mode pressure sensor (or cement paste ph sensor or pressure sensor), in main muscle, be connected and fixed support.Measure cable, hydraulic tube or pneumatic tube and be bundled in main muscle side by steel wire.Multipoint mode pressure sensor is up arranged from bottom reinforcing cage, and the end of from, up the spacing of each sensor is by close to dredging, and spacing is from 50cm ~ 100cm, and the height that sensor is arranged or quantity require to arrange with geologic information and relevant design according to stake is long.
2, after reinforcing cage is in place, utilizes hydraulic pressure (or air pressure) to be ejected by novel multipoint mode sensor, contact with hole wall, then toward drilled pile concreting.
3, after concrete reach design strength 70% or more, before slip casting, the soil pressure (or test ph value, or test pressure) of each degree of depth before special Acquisition Instrument test slip casting is utilized.
4, when slip casting terminates after certain maintenance consolidation time, then the soil pressure of each degree of depth after same procedure test slip casting is adopted.Thus the distribution of slurries in Pile side soil body can be obtained.
In the present embodiment, pressure becomes large or ph value increases, and namely illustrates that mud jacking is effective; The height that anti-slurry reaches is less, and namely grouting result is better.
Finally, it should be noted that above what enumerate is only specific embodiments of the invention.Obviously, the invention is not restricted to above embodiment, a lot of distortion can also be had.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention, all should think protection scope of the present invention.
Claims (3)
1., based on the method for multiple spot ejecting type sensor measurement techniques detection of pier foundation post jacking quality, it is characterized in that: comprise the steps:
(1), sensor installation: the sensor of band hydraulic cylinder or pneumatic cylinder is fixed on the main muscle of reinforcing cage, described sensor is fixedly connected with the piston rod of hydraulic cylinder or pneumatic cylinder, the output of the collection signal sensor input connection of outside Acquisition Instrument; Multiple sensor is upwards arranged along the bottom of reinforcing cage, the spacing of adjacent sensors at 50cm ~ 100cm, and from the lower arrangement from upper sensor by close to dredging; Measuring cable, hydraulic tube or pneumatic tube is bundled in by main muscle by steel wire;
(2), install reinforcing cage: install reinforcing cage at the stake holes internal fixtion of the castinplace pile dug in advance, described reinforcing cage comprises by many vertical settings and the main muscle of circular array and horizontal interval are welded on the multiple hoop stirrups on described main muscle;
(3), the ejecting of sensor: after reinforcing cage is in place, utilize hydraulic cylinder or pneumatic cylinder to be ejected by sensor, the sensor after ejecting contacts with the hole wall of castinplace pile;
(4) toward concreting in the stake holes of castinplace pile;
(5), after concrete reach design strength 70% or more, the numerical value that before utilizing Acquisition Instrument to read slip casting, the sensor of each degree of depth records;
(6), slip casting;
(6), slip casting terminates, after maintenance is reinforced, and the numerical value that after recycling Acquisition Instrument reads slip casting, the sensor of each degree of depth records; The distribution of slurries in Pile side soil body can be obtained by the contrast of numerical value before and after slip casting.
2., as claimed in claim 1 based on the method for multiple spot ejecting type sensor measurement techniques detection of pier foundation post jacking quality, it is characterized in that: described sensor is pressure sensor or Ph sensor.
3., as claimed in claim 2 based on the method for multiple spot ejecting type sensor measurement techniques detection of pier foundation post jacking quality, it is characterized in that: described hydraulic cylinder or pneumatic cylinder are fixed on main muscle by fixed support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510672906.2A CN105386473A (en) | 2015-10-16 | 2015-10-16 | Method for detecting pile foundation post grouting quality based on multi-point ejection type sensor measurement technology |
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| CN201510672906.2A CN105386473A (en) | 2015-10-16 | 2015-10-16 | Method for detecting pile foundation post grouting quality based on multi-point ejection type sensor measurement technology |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105908789A (en) * | 2016-04-20 | 2016-08-31 | 浙江工业大学 | Method for comprehensively detecting pile foundation post-grouting quality by applying cable heating and optical fiber temperature measurement |
| CN105926683A (en) * | 2016-04-20 | 2016-09-07 | 浙江工业大学 | Novel method for detecting pile foundation post-grouting quality by using distributed optical fiber temperature measurement technology |
| CN108678036A (en) * | 2018-06-14 | 2018-10-19 | 中国建筑第八工程局有限公司 | The detecting system installation method of the lateral soil pressure of bored concrete pile |
| CN108755787A (en) * | 2018-06-14 | 2018-11-06 | 中国建筑第八工程局有限公司 | The detecting system of the lateral soil pressure of bored concrete pile |
| CN109868850A (en) * | 2019-01-28 | 2019-06-11 | 陕西水木盛元科技工程有限责任公司 | Detection of construction quality system, reinforcing construction technique and reinforcing construction device |
| CN111021359A (en) * | 2019-12-25 | 2020-04-17 | 中铁上海工程局集团有限公司 | Pressure-controllable intelligent post-grouting device and method for pile end and pile side of cast-in-situ bored pile |
| CN111676944A (en) * | 2020-07-24 | 2020-09-18 | 陕西建工第十二建设有限公司 | Undisturbed soil sensor installation device |
| CN111827981A (en) * | 2020-06-23 | 2020-10-27 | 中国五冶集团有限公司 | Manual hole digging pile pore-forming size inspection device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105908789A (en) * | 2016-04-20 | 2016-08-31 | 浙江工业大学 | Method for comprehensively detecting pile foundation post-grouting quality by applying cable heating and optical fiber temperature measurement |
| CN105926683A (en) * | 2016-04-20 | 2016-09-07 | 浙江工业大学 | Novel method for detecting pile foundation post-grouting quality by using distributed optical fiber temperature measurement technology |
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| CN108755787A (en) * | 2018-06-14 | 2018-11-06 | 中国建筑第八工程局有限公司 | The detecting system of the lateral soil pressure of bored concrete pile |
| CN109868850A (en) * | 2019-01-28 | 2019-06-11 | 陕西水木盛元科技工程有限责任公司 | Detection of construction quality system, reinforcing construction technique and reinforcing construction device |
| CN109868850B (en) * | 2019-01-28 | 2021-05-11 | 陕西水木盛元科技工程有限责任公司 | Construction quality detection system, reinforcement construction process and reinforcement construction device |
| CN111021359A (en) * | 2019-12-25 | 2020-04-17 | 中铁上海工程局集团有限公司 | Pressure-controllable intelligent post-grouting device and method for pile end and pile side of cast-in-situ bored pile |
| CN111827981A (en) * | 2020-06-23 | 2020-10-27 | 中国五冶集团有限公司 | Manual hole digging pile pore-forming size inspection device |
| CN111676944A (en) * | 2020-07-24 | 2020-09-18 | 陕西建工第十二建设有限公司 | Undisturbed soil sensor installation device |
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