CN206832653U - Negative pressure of vacuum tests the device of muck soil coefficient of friction - Google Patents
Negative pressure of vacuum tests the device of muck soil coefficient of friction Download PDFInfo
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- CN206832653U CN206832653U CN201720561333.0U CN201720561333U CN206832653U CN 206832653 U CN206832653 U CN 206832653U CN 201720561333 U CN201720561333 U CN 201720561333U CN 206832653 U CN206832653 U CN 206832653U
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Abstract
The utility model discloses a kind of device of negative pressure of vacuum test muck soil coefficient of friction, including cylindrical body, the one end open of cylindrical body, other end closing, the openend of cylindrical body is inserted in the soil body down, the blind end of the cylindrical body connects vavuum pump by pipe fitting, and cylindrical body is configured with the displacement measuring device of the vacuum degree measuring equipment of vacuum in measurable staving, the device for pressure measurement of measurable staving pressure and its measurable vertical direction shift length.It can measure to obtain side friction and maximum counter-force value when bearing upward pulling force that the cylindrical body is subject under various soil mass depth using said apparatus, and then obtain side friction and the maximum counter-force value that pile body may be subject under different depth, required pile body depth, quantity and the diameter set under various muck soils can be further calculated in advance by these data, pile foundation is preferably supported to upper building, at the same can avoid very much pile foundation dosage excessive and caused by waste.
Description
Technical field
It the utility model is related to a kind of device of negative pressure of vacuum test muck soil coefficient of friction.
Background technology
In construction building thing on muck soil, generally require to set pile foundation and supported, but different places and difference
Often there is larger difference in the frictional resistance and coefficient of friction that the muck soil of depth can provide, if it is possible to by measuring in advance
Obtaining frictional resistance and coefficient of friction of the pile body in the soil body under different depth can make designer preferably distribute stake rationally
The quantity and depth that base is set, can either ensure enough supporting forces, can avoid excessively setting pile foundation and causing to waste again.
Utility model content
In view of the deficiency of background technology, technical problem to be solved in the utility model is to provide a kind of negative pressure of vacuum test
The device of muck soil coefficient of friction, the device can measure to obtain side friction and friction system under muck soil different depth
Number.
Therefore, the device of negative pressure of vacuum test muck soil coefficient of friction provided by the utility model, including column barrel
Body, the one end open of cylindrical body, other end closing, the openend of cylindrical body are inserted in the soil body down, the cylinder
The blind end of shape staving connects vavuum pump by pipe fitting, and the cylindrical body is configured with the vacuum of vacuum in measurable staving
Spend the displacement measurement dress of measurement apparatus, the device for pressure measurement of measurable staving pressure and its measurable vertical direction shift length
Put, the vavuum pump be configured with it is controllable its vacuumize flow and open and close controller for vacuum pump, the vacuum degree measuring equipment,
Device for pressure measurement, displacement measuring device and controller for vacuum pump are connected with PLC, and PLC is according to the cylindrical body received
Interior vacuum setting value regulates and controls controller for vacuum pump, is measured in the PLC regulation processes according to the vacuum degree measuring equipment
Regulation and control of the vacuum data correction arrived to the controller for vacuum pump, the vacuum number of degrees in column barrel body are received as PLC
According to reaching setting value, and institute's displacement measurement device is detected to obtain the cylindrical body when stopping to bottom offset, the PLC
The pressure value that is subject to according to the cylindrical body that is now received from device for pressure measurement measurement, staving are conducted oneself with dignity, staving shift length
Frictional resistance is calculated with lateralarea inside and outside staving.
Said apparatus provided by the utility model can measure to obtain the cylindrical body under various soil mass depth by
To side friction and maximum counter-force value when bearing upward pulling force, and then obtain the side that pile body may be subject under different depth
Frictional resistance and maximum counter-force value, it is deep that the required pile body set under various muck soils can be further calculated in advance by these data
Degree, quantity and diameter, enable pile foundation preferably to be supported to upper building, at the same can avoid very much pile foundation dosage excessive and
Caused by waste.
Brief description of the drawings
Fig. 1 is that the negative pressure of vacuum of the utility model the first embodiment offer tests the device of muck soil coefficient of friction
Structural representation.
Fig. 2 is that the negative pressure of vacuum that second of embodiment of the utility model provides is tested in the device of muck soil coefficient of friction
Cylindrical body structural representation.
Fig. 3 is the structure end view of the sleeve in Fig. 2.
Fig. 4 is the stress diagram of the cylindrical body in Fig. 1.
Fig. 5 is cylindrical body submergence depth and vacuum graph of a relation.
Fig. 6 is inverse side friction and vacuum graph of a relation.
Embodiment
Shown in reference picture 1, the negative pressure of vacuum that the first embodiment of the utility model provides tests muck soil coefficient of friction
Device, including cylindrical body 1, the one end open of cylindrical body 1, other end closing, the openend court of cylindrical body 1
Underthrust enters in the soil body 2, and the blind end of the cylindrical body 1 connects vavuum pump 3 by pipe fitting, and the cylindrical body 1 configures
There are the vacuum degree measuring equipment of vacuum in measurable staving, the device for pressure measurement of measurable staving pressure and measurable its to hang down
Displacement measuring device from Nogata to shift length, the vavuum pump 3 be configured with it is controllable its vacuumize flow and open and close vacuum
Pump controller, the vacuum degree measuring equipment, device for pressure measurement, displacement measuring device and controller for vacuum pump connect with PLC
Connect, PLC is computer, and PLC regulates and controls controller for vacuum pump, institute according to vacuum setting value in the cylindrical body 1 received
The vacuum data correction obtained according to the vacuum degree measuring equipment measurement in PLC regulation processes is stated to control the vavuum pump
The regulation and control of device, when the vacuum degrees of data that PLC is received in cylindrical body 1 reaches setting value, and institute's displacement measurement device
When detecting obtains the cylindrical body 1 and stopped to bottom offset, the PLC from device for pressure measurement measurement according to now receiving
Lateralarea calculates frictional resistance inside and outside pressure value, staving deadweight, staving shift length and the staving that cylindrical body 1 is subject to.
Shown in reference picture 1, in the above-described embodiments, connect and be provided with the pipe fitting of the vavuum pump 3 and cylindrical body 1
The check-valves 4 for preventing gas from inversely entering in column barrel body, the vacuum degree measuring equipment include controlling with vacuum digital display
Case 5, the one end of vacuum digital display control cabinet 5 is connected with the vavuum pump 3, the other end passes through communicating pipe 6 and the cylindrical body 1
Connection.
Shown in reference picture 1, in the above-described embodiments, institute's displacement measurement device includes being arranged on the cylindrical body
The reflector plate 7 at end and the total powerstation 8 for being arranged at the side of cylindrical body 1, total powerstation 8 are whole station type electronic distance meter, are one
Kind integrates light, mechanical, electrical high-tech measuring instrument.
Shown in reference picture 1, in the above-described embodiments, the device for pressure measurement includes being arranged at the cylindrical body 1
The pressure transmitter 9 of upper end, pressure transmitter 9 with the pressure sensor exported as standard signal be one kind receive pressure variations by
Ratio is converted to the instrument of standard output signals, and the pressure measurement diaphragm upper and lower surface of pressure transmitter 9 contacts top atmospheric pressure respectively
With air pressure in the cylindrical body 1 of bottom, the pressure transmitter 9 is connected with dc source both positive and negative polarity and forms loop, described
The signal output part of pressure transmitter 9 is connected with Dynamic Signal real-time analyzer 10, and Dynamic Signal real-time analyzer 10 and PLC connects
Connect.
Shown in reference picture 1, Fig. 5, Fig. 6, the dress of negative pressure of vacuum test muck soil coefficient of friction provided by the utility model
The method for putting measurement muck soil coefficient of friction, comprises the following steps：
A, the openend of the cylindrical body 1 is partially inserted into the muck soil for needing to measure coefficient of friction and kept
Cylindrical body 1 is in hermetic seal state, and the vacuum degree measuring equipment, the pressure test device are connected into the cylinder
The upper end of shape staving, cylindrical body 1 are connected by pipe fitting with the vavuum pump 3, and vavuum pump 3 connects the vavuum pump control
Device, the vacuum degree measuring equipment, device for pressure measurement, displacement measuring device and controller for vacuum pump are connected to PLC；
B, vavuum pump 3 is opened, vavuum pump 3 extracts the gas in the cylindrical body 1, when cylindrical body 1 drops to
Precalculated position and when no longer declining, sends control signal from PLC to controller for vacuum pump, promotes vavuum pump 3-dimensional to hold column barrel
Vacuum in body 1；
C, the vacuum degrees of data in the cylindrical body 1 is collected by PLC, the pressure that the upper end of cylindrical body 1 is subject to
Data and the dropping distance data of cylindrical body 1, and the inner ring with reference to where measuring the obtained inwall of cylindrical body 1 in advance is straight
Side friction of the cylindrical body 1 in the soil body under certain depth is calculated in outer annular diameter where footpath and outer wall and friction is
Number；
D, regulate and control controller for vacuum pump, promote vavuum pump 3 to increase and vacuumize flow, and step B, C is repeated and obtains not
With the side friction and coefficient of friction under depth.
Vacuum negative pressure device uses the structure of cylindrical body 1, and cylindrical body 1 is preferably steel drum, can be played very well
Sealing function, ensure the effect of vacuum.After being vacuumized to steel drum, certain vacuum degree can be produced, can be on air pump control panel
Read vacuum degree.Meanwhile steel drum can sink under atmospheric pressure and Action of Gravity Field, its deflection increment, which can use, comes card entirely
Instrument of standing measures, and its precision is 0.1mm, it is sufficient to meets test requirements document.With the increase of steel drum embedded depth, F air+G steel drums can be with
Side friction forms balance, and now referring to shown in Fig. 4, the calculation formula of the model is as follows：
So far, scene is tested three times altogether, and field data arranges as follows：
Table 1-1 first time test data tables
Second of test data table of table 1-2
Table 1-3 third time test data tables
In the above-described embodiments, in order to measure maximum counter-force value, after step D puller system can also be used slowly vertical
Pull up the column barrel:1, recorded by displacement measuring device under the time and the time that cylindrical body 1 moves moment
The value of thrust of application, deducting atmospheric pressure value and cylindrical body 1 that the cylindrical body 1 is subject to and its auxiliary device
After deadweight, you can obtain maximum counter-force numerical value of the cylindrical body 1 under different depth.
Shown in reference picture 2, Fig. 3, second of embodiment of the utility model and the first embodiment are essentially identical, and it is distinguished only
It is：In order to more accurately simulate frictional resistance and the coefficient of friction that different pile bodies are subject to, the inwall of the cylindrical body 1 and
The neck 11 of annular spread is offered on outer wall respectively, the neck 11 is embedded in the sleeve of simulation piles with different side wall material
12.Operator can use the material of different pile bodies that sleeve 12 is made, and inside and outside sleeve 12 is inserted in the neck 11 on inner and outer wall
In, it thus can simulate side friction and coefficient of friction that true pile body is subject under different depth.
Claims (5)
1. a kind of device of negative pressure of vacuum test muck soil coefficient of friction, it is characterized in that：Including cylindrical body, column barrel
The one end open of body, other end closing, the openend of cylindrical body are inserted in the soil body down, the closing of the cylindrical body
End by pipe fitting connection vavuum pump, the cylindrical body be configured with the vacuum degree measuring equipment of vacuum in measurable staving,
The displacement measuring device of the device for pressure measurement of measurable staving pressure and its measurable vertical direction shift length, the vacuum
Pump is configured with the controllable controller for vacuum pump that it vacuumizes flow and opened and closed, the vacuum degree measuring equipment, pressure measxurement dress
Put, displacement measuring device and controller for vacuum pump are connected with PLC, PLC is set according to vacuum in the column barrel body received
Definite value regulates and controls controller for vacuum pump, the vacuum obtained in the PLC regulation processes according to the vacuum degree measuring equipment measurement
Regulation and control of the data correction to the controller for vacuum pump, when the vacuum degrees of data that PLC is received in column barrel body reaches setting
Value, and institute's displacement measurement device is detected to obtain the cylindrical body when stopping to bottom offset, the PLC according to now from
Inside and outside pressure value, staving deadweight, staving shift length and the staving that the cylindrical body that device for pressure measurement measurement receives is subject to
Lateralarea calculates frictional resistance.
2. the device of negative pressure of vacuum test muck soil coefficient of friction according to claim 1, it is characterized in that：Described in connection
The check-valves for preventing that gas from inversely entering in column barrel body, the vacuum are provided with the pipe fitting of vavuum pump and cylindrical body
Spend measurement apparatus include with vacuum digital display control cabinet, vacuum digital display control cabinet one end is connected with the vavuum pump, the other end
It is connected by communicating pipe with the cylindrical body.
3. the device of negative pressure of vacuum test muck soil coefficient of friction according to claim 1, it is characterized in that：The displacement
Measurement apparatus includes being arranged at the reflector plate of the cylindrical body upper end and the total powerstation being arranged at beside cylindrical body.
4. the device of negative pressure of vacuum test muck soil coefficient of friction according to claim 1, it is characterized in that：The pressure
Measurement apparatus includes being arranged at the pressure transmitter of the cylindrical body upper end, the pressure measurement diaphragm upper and lower surface of pressure transmitter
Air pressure in top atmospheric pressure and the column barrel body of bottom is contacted respectively, and the pressure transmitter is connected with dc source both positive and negative polarity
And loop is formed, the signal output part of the pressure transmitter is connected with Dynamic Signal real-time analyzer, and Dynamic Signal divides in real time
Analyzer is connected with PLC.
5. the device of the negative pressure of vacuum test muck soil coefficient of friction according to claim 1 or 2 or 3 or 4, its feature
It is：The neck of annular spread is offered on the inner and outer wall of the cylindrical body respectively, the neck is embedded in simulation not
With the sleeve of pile body side-wall material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720561333.0U CN206832653U (en) | 2017-05-19 | 2017-05-19 | Negative pressure of vacuum tests the device of muck soil coefficient of friction |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720561333.0U CN206832653U (en) | 2017-05-19 | 2017-05-19 | Negative pressure of vacuum tests the device of muck soil coefficient of friction |
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| CN206832653U true CN206832653U (en) | 2018-01-02 |
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| CN201720561333.0U Active CN206832653U (en) | 2017-05-19 | 2017-05-19 | Negative pressure of vacuum tests the device of muck soil coefficient of friction |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107796754A (en) * | 2017-05-19 | 2018-03-13 | 浙江元本检测技术股份有限公司 | The apparatus and method that negative pressure of vacuum tests muck soil coefficient of friction |
| CN108844823A (en) * | 2018-06-20 | 2018-11-20 | 中交第二航务工程局有限公司 | Measure any depth soil layer side friction device and method |
-
2017
- 2017-05-19 CN CN201720561333.0U patent/CN206832653U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107796754A (en) * | 2017-05-19 | 2018-03-13 | 浙江元本检测技术股份有限公司 | The apparatus and method that negative pressure of vacuum tests muck soil coefficient of friction |
| CN107796754B (en) * | 2017-05-19 | 2024-04-23 | 浙江元本检测技术股份有限公司 | Device and method for testing friction coefficient of mucky soil by vacuum negative pressure |
| CN108844823A (en) * | 2018-06-20 | 2018-11-20 | 中交第二航务工程局有限公司 | Measure any depth soil layer side friction device and method |
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