CN111593717A - Novel pore pressure static sounding device for pile foundation performance test - Google Patents
Novel pore pressure static sounding device for pile foundation performance test Download PDFInfo
- Publication number
- CN111593717A CN111593717A CN202010465961.5A CN202010465961A CN111593717A CN 111593717 A CN111593717 A CN 111593717A CN 202010465961 A CN202010465961 A CN 202010465961A CN 111593717 A CN111593717 A CN 111593717A
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- jack
- pile foundation
- friction sleeve
- cylinder body
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
Abstract
The invention relates to a novel piezocone penetration test device for pile foundation performance test, which comprises a signal device, a vibrating string type strain gauge, a force sensor, a jack, a filter, a vibrating string type pressure sensor and a cone probe. The signal device is fixed in the friction sleeve, and the cable passes through the upper part of the probe and is connected with an acquisition system on the ground; one end of the rubber hose is connected with the jack cylinder body, and the other end of the rubber hose penetrates out of the upper part of the probe to be connected with an external pressurization system; the vibrating wire strain gauges are symmetrically arranged on the inner wall of the friction sleeve, and the force sensors are fixed at symmetrical positions on two sides of the lower part of the friction sleeve; two sides of the lower part of the friction sleeve are connected with two filters; the vibrating wire type pressure sensor is arranged at the bottom of the jack; the straight rod part of the conical head is arranged in the friction sleeve, and the steel rod can move up and down freely. The invention can measure the cone tip resistance, the side wall friction resistance and the pore water pressure in the penetration process, and can better research the bearing characteristic of the pile end in the working process of the pile foundation.
Description
Technical Field
The invention relates to a novel piezocone penetration test device for pile foundation performance test, and belongs to the technical field of geotechnical engineering test.
Background
The design of vertically loaded piles is very important in deep foundation pit engineering because the application of pile foundations can save a large amount of money. The stress-strain characteristics of the pile end soil play a key role in pile foundation design. Pile tip response includes both load bearing and settlement aspects. Current pile design methods assume that the pile tip response is governed by the bearing theory. Although generally safe, this method is somewhat crude and does not correctly account for soil deformation and settling. On-site static tests are often used to verify the design of the pile, however, in conventional static load tests it is difficult to mobilize the pile tip resistance sufficiently to analyze the pile tip response and to determine the proportion of the applied load that actually reaches the pile tip, and the potential residual load at the pile tip adds complexity to the analysis. At the same time, most pile foundation designs rely on information obtained from field surveys, particularly the results of field trials. Because the cone penetrometer and the pile have certain similarity, the piezocone penetration test technology is widely applied to the aspect of evaluating the bearing characteristic of the pile foundation. However, the piezocone penetration test technology cannot well reflect the stress-strain characteristics of the pile end soil, and is difficult to accurately reflect the stress state of the pile end soil of the pile foundation in the working process, so that a novel penetration test device needs to be developed to assist in the design of the pile.
Pile foundation detection is an essential important link in pile foundation engineering. When the pile foundation performance detection test is carried out on site, a large amount of manpower and material resources are consumed, the safety management of the site test is difficult, and the change condition of the soil body around the pile cannot be directly observed. Therefore, the method for evaluating the bearing characteristics of the pile foundation by means of the in-situ test technology is an efficient and convenient means. Meanwhile, the load displacement curve of the pile end has important significance for pile foundation design and bearing characteristic evaluation.
Disclosure of Invention
The technical problem is as follows: the invention aims to provide a multifunctional piezocone penetration test device and a test method for testing pile foundation performance, which have simple structure and convenient operation, can measure the cone tip resistance, the side wall friction resistance and the pore water pressure in the penetration process, and can better study the bearing characteristic of a pile end in the working process of a pile foundation.
The technical scheme is as follows: the utility model provides a novel piezocone sounding device for pile foundation capability test which characterized in that, includes signal device, vibrating string formula strainometer, force transducer, jack, wave filter, vibrating string formula pressure sensor, circular cone probe, pressurization handle, relief valve, machine oil filler and rubber hose. The signal device is fixed in the friction sleeve, and the cable penetrates through the upper part of the conical probe and is connected with the acquisition system on the ground; one end of the rubber hose is connected with the cylinder body of the jack, and the other end of the rubber hose penetrates out of the upper part of the conical probe to be connected with an external pressurization system; the vibrating wire strain gauges are symmetrically arranged on the inner wall of the friction sleeve, and the force sensors are fixed at symmetrical positions on two sides of the lower part of the friction sleeve; two sides of the lower part of the friction sleeve are connected with two filters; the vibrating wire type pressure sensor is arranged at the bottom of the jack; the straight rod part of the conical probe is arranged in the friction sleeve, the steel rod can freely move up and down, and the steel rod is connected with the jack cylinder body through the vibrating string strain gauge.
Furthermore, the signal device comprises a signal acquisition module, a signal transmission module and a signal display module. The static sounding probe converts various measured values in the static sounding process into electric signals, and the signal acquisition module acquires the electric signals and converts the electric signals into digital signals; the signal acquisition module transmits the digital signal to the display module through a wired cable; and the display module displays data in the measuring process.
Further, the cylinder body external diameter of jack is 60 mm, and the internal diameter is 30mm, and the height is 140 mm. The diameter of a piston of the jack is 30mm, and the stroke is 100 mm; the bearing capacity of the jack is about 20kN, and the pressure of a cylinder body of the jack and the displacement of a piston are measured by a vibrating wire strain gauge arranged on the upper surface of the jack.
Furthermore, the straight rod part of the conical probe is arranged in a circular pipeline inside the friction sleeve and is connected with the jack cylinder body through a vibrating string type strain gauge; the outer diameter of the steel pipe is 60 mm, and the length is 500 mm.
Furthermore, the cylinder body of the jack is pressurized by a ground manual pressurization system, the piston is pushed to move after the pressure of the cylinder body is increased, the conical probe is pushed to be separated from the friction sleeve, and the straight rod part of the conical probe is welded with a protection device, so that the conical probe can be prevented from falling off in the soil under the pressure action of the jack.
Further, in the above-mentioned case,the conical probe part has two sizes, one type is cone angle 60 degrees, and the surface area of the conical head part is 70 cm2For static cone penetration testing; the other type is 120 degrees, and the surface area of the conical head part is 40 cm2And the test piece is used for consolidation compression tests.
Furthermore, the vibrating wire type pressure sensor measures the side wall friction in the static sounding process, the force sensor measures the cone tip resistance in the static sounding process, and the additional pressure sensor arranged in the hole of the jack can measure the pore water pressure of the cone tip.
Further, the vibrating wire type strain gauge comprises two end blocks, a lead wire, a coil assembly, a protection tube and the like.
Furthermore, the vibrating wire type pressure sensor comprises a ring, a diaphragm, a coil, a vibrating wire, a pressure-sensitive diaphragm, a sealing clapboard, waterproof epoxy resin, a cable and the like; the pressure-sensitive membrane is hermetically welded on the membrane box.
Drawings
FIG. 1 is a schematic view of a test apparatus according to the present invention;
FIG. 2 is a schematic view of an inner circular steel tube of the friction sleeve of the present invention;
in the figure: 1-a signal device, 2-a vibrating wire strain gauge, 3-a force sensor, 4-a jack, 5-a filter, 6-a vibrating wire pressure sensor, 7-a conical probe, 8-a pressurizing handle, 9-a release valve, 10-an engine oil filling port and 11-a rubber hose.
Detailed Description
The present invention will now be described more fully hereinafter with reference to the accompanying drawings.
The novel piezocone penetration test device for pile foundation performance test shown in fig. 1 comprises a signal device 1, a vibrating wire type strain gauge 2, a force sensor 3, a jack 4, a filter 5, a vibrating wire type pressure sensor 6, a conical probe 7, a pressurizing handle 8, a release valve 9, an engine oil filling port 10 and a rubber hose 11. The signal device is fixed in the friction sleeve, and the cable penetrates through the upper part of the conical probe and is connected with the acquisition system on the ground; one end of the rubber hose is connected with the cylinder body of the jack, and the other end of the rubber hose penetrates out of the upper part of the conical probe to be connected with an external pressurization system; the vibrating wire strain gauges are symmetrically arranged on the inner wall of the friction sleeve, and the force sensors are fixed at symmetrical positions on two sides of the lower part of the friction sleeve; two sides of the lower part of the friction sleeve are connected with two filters; the vibrating wire type pressure sensor is arranged at the bottom of the jack; the straight rod part of the conical probe is arranged in the friction sleeve, and the steel rod can move up and down freely.
In this embodiment, the signal device 1 includes a signal acquisition module, a signal transmission module, and a signal display module. The static sounding probe converts a measured value in the static sounding process into an electric signal, and the signal acquisition module acquires the electric signal and converts the electric signal into a digital signal; the signal acquisition module transmits the digital signal to the display module through a cable; the display module displays data in the measuring process in real time, and after the testing process is finished, the display module can store the data acquired in the testing process.
In this embodiment, the cylinder of the jack has an outer diameter of 60 mm, an inner diameter of 30mm and a height of 140 mm. The diameter of a piston of the jack is 30mm, and the stroke is 100 mm; the bearing capacity of the jack is about 20kN, and the pressure of a cylinder body of the jack and the displacement of a piston are measured by a vibrating wire strain gauge arranged on the upper surface of the jack.
In the embodiment, the straight rod part of the conical probe is arranged in a circular pipeline inside the friction sleeve and is connected with the jack cylinder body through the vibrating string type strain gauge; the outer diameter of the steel pipe is 60 mm, and the length is 500 mm.
In this embodiment, the cylinder body of jack is pressurized by the manual pressurization system on ground, and the piston motion is promoted to cylinder body pressure increase back, promotes circular cone probe and friction sleeve separation, and the straight pole portion welding of circular cone probe has protection device, can prevent that circular cone probe from droing in soil under the pressure effect of jack.
In this embodiment, the conical probe portion has two dimensions, one of which is a cone angle of 60 ° and a cone head portion surface area of 70 cm2For static cone penetration testing; the other type is 120 degrees, and the surface area of the conical head part is 40 cm2And the test piece is used for consolidation compression tests.
In this embodiment, the vibrating wire pressure sensor measures the side wall frictional resistance in the static sounding process, the force sensor measures the cone tip resistance in the static sounding process, and the additional pressure sensor installed in the hole of the jack can measure the pore water pressure of the cone tip.
In the present embodiment, the vibrating wire strain gauge includes two end blocks, a wire, a coil block, a protection tube, and the like.
In this embodiment, the vibrating wire pressure sensor is composed of a circular ring, a diaphragm, a coil, a vibrating wire, a pressure-sensitive diaphragm, a sealing partition plate, waterproof epoxy resin, a cable and the like; the pressure-sensitive membrane is hermetically welded on the membrane box.
The using principle and the method of the invention are as follows:
when the vibrating wire strain gauge is used for measuring the friction resistance of the side wall of the friction cylinder, under the action of an external load, the deformation of the structure enables the end blocks at two ends to relatively displace, so that the tension of the steel wire rope and the vibration frequency are changed. The electric coil and the permanent magnet on the wire send voltage pulses to the coil, which is then transmitted to a data recorder and computer through a signal cable. The vibration of the wire can generate alternating current in the coil; the frequency of the alternating current is similar to the vibration frequency of the wire and is measured by the same electronic coil and data recorder. The strain of the vibrating wire strain gauge is calculated by the following formula:
in the formula (I), the compound is shown in the specification,
is the strain in the micro-strain and,
is the frequency of vibration of the vibrating wire.
Before the test, a jack cylinder body in the probe is connected with a manual pressurization system on the ground through a rubber hose, and the main components of the manual pressurization system comprise a handle, a release valve, a hose connector, an engine oil filling screw, a dust cover and the like. The hose is provided with a pressure gauge for measuring and controlling the pressure change of the fluid in the jack. The static sounding test can be carried out by a hand-operated penetrometer, and the probe stops pressurizing after penetrating to a specified depth. And then, a manual pressurization system is controlled to apply pressure to the conical probe, the pressure is increased in an accumulated mode by a certain increment, and the displacement change condition of the conical probe under each stage of load is recorded.
Vibrating wire pressure sensors are designed for high pressure fluid pressure measurement. The sensor uses a pressure sensitive diaphragm attached to the vibrating wire element. The pressure sensitive diaphragm is welded on the diaphragm box and sealed. The fluid pressure causes deformation of the pressure sensitive diaphragm, causing a change in the vibrating wire frequency. The change in the resonant frequency is transmitted to the data logger device by a coil acting on the capsule wall.
The pressure gauge is used for measuring the change of the fluid pressure inside the jack when the conical probe is pushed away from the friction sleeve. The main purpose of the pressure gauge installation is to measure and control the load of the manually pressurized system in order to perform consolidation compression tests.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.
Claims (9)
1. A novel piezocone penetration test device for pile foundation performance test is characterized by comprising a signal device, a vibrating string type strain gauge, a force sensor, a jack, a filter, a vibrating string type pressure sensor, a conical probe, a pressurizing handle, a release valve, an engine oil filling port and a rubber hose; the signal device is fixed inside the friction sleeve; one end of the rubber hose is connected with the cylinder body of the jack, and the other end of the rubber hose penetrates out of the upper part of the conical probe to be connected with an external pressurization system; the vibrating wire strain gauges are symmetrically arranged on the inner wall of the friction sleeve, and the force sensors are fixed at symmetrical positions on two sides of the lower part of the friction sleeve; two sides of the lower part of the friction sleeve are connected with two filters; the vibrating wire type pressure sensor is arranged at the bottom of the jack; the straight rod part of the conical probe is arranged in the friction sleeve, the steel rod can freely move up and down, and the steel rod is connected with the jack cylinder body through the vibrating string strain gauge.
2. The novel piezocone penetration test device for pile foundation performance test of claim 1, characterized in that: the signal device comprises a signal acquisition module, a signal transmission module and a signal display module; the static sounding probe converts a measured value in a static sounding process into an electric signal, and the signal acquisition module acquires the electric signal and converts the electric signal into a digital signal; the signal acquisition module transmits the digital signal to the display module through a cable; and the display module displays data in the measuring process.
3. The novel piezocone penetration test device for pile foundation performance test of claim 1, characterized in that: the outer diameter of a cylinder body of the jack is 60 mm, the inner diameter of the cylinder body is 30mm, and the height of the cylinder body is 140 mm; the diameter of a piston of the jack is 30mm, and the stroke is 100 mm; the bearing capacity of the jack is 20kN, and the pressure of the cylinder body and the displacement of the piston are measured by a vibrating wire strain gauge arranged on the upper surface of the jack.
4. The novel piezocone penetration test device for pile foundation performance test of claim 1, characterized in that: the straight rod part of the conical probe is arranged in a circular pipeline inside the friction sleeve and is connected with the jack cylinder body through the vibrating string type strain gauge; the outer diameter of the steel pipe is 60 mm, the length of the steel pipe is 500 mm, the wall thickness of the steel pipe is 5mm, and the length of the internal thread and the external thread is 25 mm.
5. The novel piezocone penetration test device for pile foundation performance test of claim 3, characterized in that: the cylinder body of the jack is pressurized by a ground manual pressurization system, and the piston is pushed to move after the pressure of the cylinder body is increased, so that the conical probe is pushed to be separated from the friction sleeve; the straight rod part of the conical probe is welded with a protection device.
6. The novel piezocone penetration test device for pile foundation performance test of claim 1, characterized in that: the conical probe part has two sizes, one type is cone angle 60 degrees, and the surface area of the conical head part is 70 cm2For static cone penetration testing; the other type is 120 degrees, and the surface area of the conical head part is 40 cm2And the test piece is used for consolidation compression tests.
7. The novel piezocone penetration test device for pile foundation performance test of claim 1, characterized in that: the vibrating wire type pressure sensor is used for measuring the side wall friction force in the static sounding process, the force sensor is used for measuring the cone tip resistance force in the static sounding process, and the additional pressure sensor arranged in the hole of the jack is used for measuring the pore water pressure of the cone tip.
8. The novel piezocone penetration test device for pile foundation performance test of claim 1, characterized in that: the vibrating wire type strain gauge comprises two end blocks, a lead, a coil assembly and a protection tube.
9. The novel piezocone penetration test device for pile foundation performance test of claim 1, characterized in that: the vibrating string type pressure sensor consists of a circular ring, a diaphragm, a coil, a vibrating string, a lightning arrester, a thermistor, a sealing partition plate, waterproof epoxy resin and a cable; the pressure-sensitive diaphragm is sealed and welded on the diaphragm box, and the change of the vibrating wire frequency is transmitted to the data recording equipment by the coil on the diaphragm box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010465961.5A CN111593717A (en) | 2020-05-28 | 2020-05-28 | Novel pore pressure static sounding device for pile foundation performance test |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010465961.5A CN111593717A (en) | 2020-05-28 | 2020-05-28 | Novel pore pressure static sounding device for pile foundation performance test |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113047254A (en) * | 2021-03-30 | 2021-06-29 | 任明永 | Be used for seismic wave pore pressure static sounding testing arrangement |
| CN113737764A (en) * | 2021-09-02 | 2021-12-03 | 中铁时代建筑设计院有限公司 | Static sounding device and static sounding method |
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| CN101858075A (en) * | 2010-04-27 | 2010-10-13 | 东南大学 | Environmental static sounding probe for contaminated foundation soil |
| CN102174808A (en) * | 2011-02-24 | 2011-09-07 | 中国地质大学（武汉） | Piezocone penetration test (CPTU) prober of dual-deformed column |
| CN102817346A (en) * | 2012-08-27 | 2012-12-12 | 东南大学 | Acoustic static sounding probe used for site identification |
| EP2535460A1 (en) * | 2011-06-16 | 2012-12-19 | Hydro Geotechnique | Device for measuring the resistance to ground penetration |
| CN103088850A (en) * | 2013-01-17 | 2013-05-08 | 东南大学 | Cycle friction sleeve barrel device for evaluating periodic load pile side friction |
| CN103343530A (en) * | 2013-06-21 | 2013-10-09 | 东南大学 | Micro-scale pore pressure static sounding probe for effectively identifying extra-thin soil layer |
| CN106223305A (en) * | 2016-07-28 | 2016-12-14 | 东南大学 | A kind of automatic consideration energy correction and the dynamic driving instrument of dynamic response |
| CN107882011A (en) * | 2017-11-29 | 2018-04-06 | 东南大学 | A kind of miniature probe with temperature compensation function |
| CN109797728A (en) * | 2019-03-12 | 2019-05-24 | 东南大学 | A kind of two-stage combination cone head hole pressure static sounding perforation device |
-
2020
- 2020-05-28 CN CN202010465961.5A patent/CN111593717A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858075A (en) * | 2010-04-27 | 2010-10-13 | 东南大学 | Environmental static sounding probe for contaminated foundation soil |
| CN102174808A (en) * | 2011-02-24 | 2011-09-07 | 中国地质大学（武汉） | Piezocone penetration test (CPTU) prober of dual-deformed column |
| EP2535460A1 (en) * | 2011-06-16 | 2012-12-19 | Hydro Geotechnique | Device for measuring the resistance to ground penetration |
| CN102817346A (en) * | 2012-08-27 | 2012-12-12 | 东南大学 | Acoustic static sounding probe used for site identification |
| CN103088850A (en) * | 2013-01-17 | 2013-05-08 | 东南大学 | Cycle friction sleeve barrel device for evaluating periodic load pile side friction |
| CN103343530A (en) * | 2013-06-21 | 2013-10-09 | 东南大学 | Micro-scale pore pressure static sounding probe for effectively identifying extra-thin soil layer |
| CN106223305A (en) * | 2016-07-28 | 2016-12-14 | 东南大学 | A kind of automatic consideration energy correction and the dynamic driving instrument of dynamic response |
| CN107882011A (en) * | 2017-11-29 | 2018-04-06 | 东南大学 | A kind of miniature probe with temperature compensation function |
| CN109797728A (en) * | 2019-03-12 | 2019-05-24 | 东南大学 | A kind of two-stage combination cone head hole pressure static sounding perforation device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113047254A (en) * | 2021-03-30 | 2021-06-29 | 任明永 | Be used for seismic wave pore pressure static sounding testing arrangement |
| CN113737764A (en) * | 2021-09-02 | 2021-12-03 | 中铁时代建筑设计院有限公司 | Static sounding device and static sounding method |
| CN113737764B (en) * | 2021-09-02 | 2023-04-14 | 中铁时代建筑设计院有限公司 | Static sounding device and static sounding method |
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Application publication date: 20200828 |
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