CN110453732B - Device for immediately and accurately measuring thickness of sediment layer and slurry performance index - Google Patents
Device for immediately and accurately measuring thickness of sediment layer and slurry performance index Download PDFInfo
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- CN110453732B CN110453732B CN201910803380.5A CN201910803380A CN110453732B CN 110453732 B CN110453732 B CN 110453732B CN 201910803380 A CN201910803380 A CN 201910803380A CN 110453732 B CN110453732 B CN 110453732B
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Abstract
The invention relates to a device for instantly and accurately measuring the thickness of a sediment layer and the performance index of slurry, which comprises a measuring main pipe, a one-way sealing device and a one-way throttle valve, wherein the one-way sealing device is arranged above the measuring main pipe; the inside of the one-way throttle valve is provided with a plugging ball body, and a thrust piston capable of moving up and down is arranged below the plugging ball body. The device simple structure, it is easy and simple to handle, can accurate reaction hole bottom sediment layer thickness, mud proportion, mastercontrol index such as sand content, solve the problem of relying on subjectivity error such as experience, easily use widely. The combination of the components makes the detection process simpler and more convenient, and effectively overcomes the misjudgment of the slurry performance index due to insufficient experience of managers; after the detection is finished, the device is convenient to disassemble and easy to clean.
Description
Technical Field
The invention relates to a device for instantly and accurately measuring the thickness of a sediment layer and a slurry performance index, and belongs to the technical field of civil engineering construction detection.
Background
Pile foundation construction is a concealed project, and cast-in-situ bored piles are the most common construction mode, and the construction quality directly influences the quality and safety of the whole bridge or building. The construction process of the cast-in-situ bored pile comprises the working procedures of drilling, cleaning, placing a reinforcement cage, pouring concrete and the like. In the drilling process, in order to prevent the hole wall from collapsing, a slurry wall protection method is usually adopted, and certain requirements are imposed on the consistency of slurry and the thickness of mud skin of the wall protection. The mud proportion, the sand content and the thickness of the sediment layer are important indexes for controlling the whole construction process in the hole cleaning process, however, the measurement of the mud proportion and the sand content in the construction process is not accurate, and the operator mostly adopts data measured by the mud near the top of the hole, so that the mud is generally safe, and the mud index at the bottom of the hole and the thickness of the sediment layer are the most concerned indexes in the construction process. The method of measuring the thickness of the sediment layer by adopting a measuring rope and a counterweight is mostly adopted, the method is difficult to accurately obtain the specific thickness of the sediment layer at the bottom of the hole, the obtained thickness is mostly in great relation with the experience of management workers, and great subjective errors exist.
The measurement of the main control performance index of the slurry and the thickness of a sediment layer in the construction process of the cast-in-situ bored pile has the following problems:
1. the operator often takes the slurry at the orifice position to measure the indexes of slurry proportion, sand content, consistency and the like, and obviously, the slurry solution concentration at the orifice position is smaller, and the performance index of the obtained slurry is not consistent with the performance index of the slurry at the bottom of the hole.
2. At present, the thickness of the sediment layer is mainly judged by the experience of management personnel, and a method of measuring a rope and adding a balance weight is more and more, so that a specific accurate value of the thickness of the sediment layer is difficult to provide.
3. The existing slurry performance index is as follows: mud weight, sand content, consistency, sediment layer thickness, etc. The measurement tool and the sampling device of the main control mud index are still difficult to adapt to the requirements of the current engineering construction by adopting the traditional method.
And the existing construction technology can not accurately and immediately obtain the hole bottom slurry index and the hole bottom sediment layer thickness, so that the construction quality has great hidden trouble problems, and the construction quality hidden troubles such as floating of a reinforcement cage and pipe blockage caused by concrete pouring in the subsequent construction process, even generation of pile bottom virtual slag, mud clamping of a pile body and the like are easily caused. Therefore, the invention provides a device capable of measuring the thickness of the sediment layer, the sand content of the mud at the bottom of the hole and the specific gravity of the mud in real time and accurately.
Disclosure of Invention
Technical problem to be solved
In order to solve the problems in the prior art, the invention provides a device for instantly and accurately measuring the thickness of a sediment layer and the slurry performance index.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
a device for instantly and accurately measuring the thickness of a sediment layer and the performance index of slurry comprises a measuring main pipe, a one-way sealing device and a one-way throttle valve, wherein the one-way sealing device is arranged above the measuring main pipe; the inside of the one-way throttle valve is provided with a plugging ball body, and a thrust piston capable of moving up and down is arranged below the plugging ball body.
In a preferred embodiment, the outer surface of the pipe wall of the main measurement pipe is provided with sedimentation layer thickness limits for different formation pile foundations.
In a preferred embodiment, the one-way sealing device, the measuring main pipe and the one-way throttle valve are in threaded connection, and a sealing ring is arranged at the connection position.
In a preferred embodiment, a readable pH meter is arranged on the inner wall of the main measuring pipe.
In a preferred embodiment, a detachable filtering sand net is arranged in the upper port of the one-way sealing device, and the filtering sand net is arranged above the piston. The detachable filtering sand screen can be removed in the sampling process, and the detachable filtering sand screen can be installed when the sand content is measured.
Furthermore, detachable filters the sand screen and is equipped with the draw-in groove that can joint filters sand screen border for one-way closing device inner wall, filters the sand screen card and connects in the draw-in groove, mountable or dismantlement when needing.
In a preferred embodiment, the thrust piston comprises a push rod which can be extended or retracted into the one-way throttle valve and a stop plate which is arranged next to the blocking ball and which, in the lowest position inside the one-way throttle valve, closes the one-way throttle valve.
In a preferred embodiment, the lower port of the one-way closing device is provided with a counterweight connecting device.
In a preferred embodiment, the upper port of the one-way throttle valve is provided with a counterweight connecting device.
In a preferred embodiment, a graduated measuring string is attached to the counterweight attachment means (to facilitate sampling and measuring bore depth).
In a preferred embodiment, the counterweight attachment means is made of steel sleeve or a metal material with a large mass.
In order to ensure that the sampling device can overcome the resistance of slurry and sink to the bottom of a hole in the sampling process, the lower port of the one-way sealing device and the upper port of the one-way throttle valve are provided with the counterweight connecting devices to play double roles of increasing the weight of the sampling device and connecting the upper component and the lower component with the measurement pipeline component, and a steel sleeve is generally adopted, so that the sampling device has larger mass.
(III) advantageous effects
The invention has the beneficial effects that:
the device for instantly and accurately measuring the thickness of the sediment layer and the mud performance index, provided by the invention, forms a multifunctional device capable of integrating in-hole mud sampling and mud performance main control index detection by assembling and combining all components in the sampling process and the detection process. The combination of the components in the device of the invention enables the detection process to be simpler, more convenient and more effective, and overcomes the misjudgment of the mud performance index due to the insufficient experience of the manager, and after the detection is finished, the device is convenient to disassemble and easy to clean.
The device provided by the invention can aim at the main control indexes of slurry in the construction process of the cast-in-situ bored pile: the depth of a hole, the thickness of a sediment layer at the bottom of the hole, the pH value of slurry, the specific gravity of the slurry, the consistency of the slurry, the sand content and the thickness of the sediment layer in the secondary hole cleaning process are detected, and the performance index of the slurry in the cast-in-situ bored pile construction project can be accurately and timely measured so as to accurately guide the construction to reduce the uncertainty in the construction process and ensure the construction quality of a pile foundation.
Drawings
FIG. 1 is a schematic view of the overall structure of the apparatus of the present invention;
FIG. 2 is a schematic view of the structure of a one-way sealing device of the present invention;
FIG. 3 is a schematic structural view of a one-way throttle valve of the apparatus of the present invention;
FIG. 4 is a schematic view of the one-way throttle valve of the apparatus of the present invention in operation;
FIG. 5 is a schematic diagram of a sampling process of the apparatus of the present invention;
FIG. 6 is an enlarged schematic view of the device of FIG. 5 remaining closed short of the bottom of the well;
FIG. 7 is a schematic diagram of the sampling operation of the apparatus of FIG. 5 when it reaches the bottom of the well;
FIG. 8 is a schematic view of a hole depth measurement calculation of the apparatus of the present invention;
FIG. 9 is a schematic diagram of the detection of the thickness of the deposit layer in the apparatus of the present invention;
FIG. 10 is a schematic view of the mud weight measurement of the apparatus of the present invention;
FIG. 11 is a schematic diagram of the consistency index detection of the apparatus of the present invention;
FIG. 12 is a mud sand test chart of the apparatus of the present invention;
fig. 13 is an enlarged schematic view of the lower part of fig. 12.
[ description of reference ]
1: a measurement main pipe;
2: a one-way sealing device;
3: a one-way throttle valve;
4: a pH meter;
5: a piston;
6: pulling a rope;
7: plugging the ball body;
8: a thrust piston;
9: filtering a sand screen;
10: a counterweight connecting device;
11: a hoisting ring;
12: and a measuring rope with scales.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
Example 1
Aiming at the problem that the measurement of the main index of the mud performance and the thickness of the sediment layer at the bottom of the hole is inaccurate in the construction site of the existing cast-in-situ bored pile, the detection device for extracting the mud at the bottom of the hole and detecting the thickness of the sediment layer at the bottom of the hole and the main control performance index of the mud is provided. The construction links and the connection of the construction procedures of the cast-in-situ bored pile are precisely guided, and the construction quality of the pile foundation is ensured. As shown in fig. 1, the device comprises a transparent measuring main pipe 1 with scales, a one-way sealing device 2 is arranged at the upper end of the measuring main pipe 1, the one-way sealing device 2 is a main component for measuring the sand ratio, a one-way throttle valve 3 is arranged at the lower end of the measuring main pipe 1, the one-way throttle valve 3 is a main component for measuring the consistency, and all the components are in threaded connection and internally attached with sealing rings; all the parts can be freely disassembled and freely combined to form a sampling device and a multifunctional detection device for detecting the main control performance index of the slurry. Specifically, the main measurement pipe 1 can be provided with measurement pipelines with different diameters and depths according to different pile hole depth requirements. The surface of the pipeline of the main measuring pipe 1 is provided with scales with different precisions to meet the requirements of engineering practice. And the outer surface of the pipe wall is provided with sedimentation layer thickness limit values aiming at different stratum pile foundations.
Furthermore, a pH meter 4 capable of reading is attached to the inner wall of the main measuring pipe 1 so as to meet the requirement of the instant measurement of the acidity and alkalinity of the slurry during the construction of the bored pile in the special stratum.
As shown in fig. 2, the opening of the upper port of the unidirectional sealing device 2 is smaller than the lower port thereof, the lower port is matched with the pipe diameter of the main measurement pipe 1, a piston 5 is arranged inside the upper end of the unidirectional sealing device 2, a pull rope 6 is arranged on the piston 5, the upper port of the unidirectional sealing device 2 can be sealed or opened by pulling the pull rope 6, and a counterweight connecting device 10 is arranged at the lower port of the unidirectional sealing device 2; in order to ensure that the sampling device can overcome the resistance of slurry and sink to the bottom of the hole in the sampling process, the lower port of the one-way sealing device and the upper port of the one-way throttle valve are provided with counterweight connecting devices to play a dual role in increasing the weight of the sampling device and connecting the upper component and the lower component with the measurement pipeline component. The two sides of the counterweight connecting device are provided with circular hanging rings 11 which play a role in connecting the measuring rope with the sampling device. The counter weight connecting device 10 is connected with a measuring rope 12 with scales, which can be freely disassembled, through a lifting ring 11, in the upper port of the one-way sealing device 2, a filtering sand screen 9 is arranged above the piston 5, the installation of the filtering sand screen 9 can be provided with a clamping groove which can be clamped with the edge of the filtering sand screen on the inner wall of the one-way sealing device, and the filtering sand screen is connected in the clamping groove and can be installed or disassembled as required. In the sampling process, the piston 5 and a sampling device (particularly the sampling device formed by removing the filtering sand net 9 in figure 1) are pulled by the pull rope 6 to form a relative motion difference to control the opening and closing of the upper bottle mouth, so that the purpose of taking the slurry solution at the bottom of the hole is achieved, and simultaneously, the slurry samples at other depths are prevented from entering the inside of the sampling device. During the detection process, the sand filtering net 9 is installed, and the sampling instrument is inverted to form the sand rate detection device.
The one-way throttle valve 3 is in an inverted cone shape, as shown in fig. 3 and 4, a counterweight connecting device 10 is arranged at an upper port of the one-way throttle valve 3, the counterweight connecting device 10 plays two roles of a counterweight and a connecting part, the counterweight connecting device 10 can be made of a steel sleeve, the counterweight connecting device 10 is connected with a measuring rope 12 with scales, a plugging sphere 7 is arranged inside the one-way throttle valve 3, a thrust piston 8 is arranged at the lower end of the plugging sphere 7, the thrust piston 8 comprises a baffle and a push rod, the push rod extends out of or retracts into a bottom hole of the one-way throttle valve 3, the baffle is close to the plugging sphere 7, and when the plugging sphere is at the lowest position inside the one-way throttle valve, the one-way throttle valve is sealed. The plugging ball 7 plays a role in controlling the opening and closing of the one-way throttle valve and determines whether to absorb muddy water into the measuring conduit or not and discharge the muddy water to clean the conduit. The thrust piston 8 jacks the plugging ball 7 through contact with the bottom of the hole, and mud water enters the sampling device from the bottom under the action of the internal and external pressure difference of the sampling device, so that a hole bottom mud solution is obtained successfully. The plugging ball 7 moves downwards to plug the lower outlet of the main measuring pipe 1 under the action of gravity when the sampling device is lifted, and water in the sampling device is prevented from flowing out.
The one-way throttle valve 3 is used for ensuring that the bottom muddy water of the hole smoothly enters the measuring main pipe 1 from the bottom of the device in the sampling process and ensuring that the muddy water in the pipeline cannot leak outwards.
The main measuring pipe in the device is vertically placed and stands still for 10-15 minutes, the solution is supposed to generate a cement layering phenomenon, and the thickness of a mud sediment layer is read through scales on the main measuring pipe.
The combination of the scale marked on the measuring rope 12 with the scale and the sampling device (the figure 1 is the integral structure of the device, and the sampling device is the sampling device after the sand filtering net 9 is removed) can realize the sampling of the mud at the bottom of the hole and the measurement of the depth of the hole; the thickness of the sediment layer is measured by keeping the sampling device still in the hole for a period of time and observing the thickness of the sediment layer of the main measuring pipe 1; the detection of the mud proportion can be realized by measuring the use of the main pipe 1 and the balance; the consistency detection can be realized by measuring the combination of the main pipe 1 and the one-way throttle valve 3 and removing the thrust piston and the plugging ball body to form a detection device of the slurry consistency; the sand content detection can be realized by measuring the combination of the main pipe 1 and the one-way sealing device 2 and assembling the filtering sand screen 9 for inverted use.
Example 2
For the detection device in example 1, the specific usage method is as follows:
the detection process is divided into two stages: a sampling process and a detection process. The mud sampler and the detection device are ingeniously combined together by utilizing the free disassembly and assembly functions of the device, so that the operation flow is simplified, and the influence of subjective factors of operators on results is avoided.
1. Sampling:
step 1: firstly, the sand filtering net 9 in the unidirectional sealing device 2 is removed, and a measuring rope 12 with scales and moved by a control device is tied at the unidirectional sealing device 2 and all parts are assembled.
Step 2: the worker slowly puts the sampler into the slurry solution near the orifice as shown in fig. 5 while pulling the pull string 6 of the upper piston 5, and the one-way closing means 2 is closed as shown in fig. 6. The control of the graduated measuring line 12 and the pull line 6 allows the piston 5 and the device as a whole to be lowered at the same speed and to maintain a state of motion relative to the rest state. When the whole device falls to the bottom of the hole, the bottom of the whole device, namely the bottom of the one-way throttle valve 3, contacts the bottom of the hole to provide an upward reverse direction for the thrust piston 8The thrust piston is pushed to move upwards by force, so that the plugging ball body 7 is pushed to move upwards, and slurry solution in the hole enters the measuring main pipe 1 from the bottom of the one-way throttle valve 3 under the action of pressure difference. Meanwhile, the bottle stopper pull rope 6 is controlled to lower the piston 5 at the end part of the seal, the piston 5 moves downwards under the action of gravity and water pressure, the upper port of the one-way sealing device is opened, and solution can freely enter the measuring main pipe from the upper port, as shown in fig. 7. The measuring device keeps the state of the upper opening and the lower opening for 10 to 20 minutes, the reading of the measuring rope 12 with the scale is read in the period, and the reading L of the measuring rope of the measuring device1+ total length L of sampling device of sampler body2Length L of one-way closing device 23I.e. the measured hole depth, as shown in fig. 8. After the slurry solution enters the main measuring pipe 1 to generate a stable cement layering phenomenon, the upper end piston 5 is pulled to plug the upper end opening of the one-way sealing device 2 so as to ensure that the slurry solution at other depths can not mix up the liquid in the sampling device. And synchronously pulling up the measuring rope 12 with the scale and the pull rope 6 of the upper sealing piston at the same speed until the hole opening obtains the bottom solution of the hole.
2. And (3) detection process:
1. and (3) measuring the hole depth: actual hole depth measurement as described above for the sampling procedure, LHole(s)Reading L of sampler measuring rope1+ length L of the sampling device itself2Length L of one-way closing device 23. As shown in fig. 8.
2. And (3) measuring the thickness of the sediment layer at the bottom of the hole:
as the whole measuring device is kept still at the bottom of the hole for 10-15 minutes, and water and mud in the hole sequentially enter the rod, the mud-water boundary is clear, and the thickness of a mud layer can be accurately observed after the main measuring pipe is lifted up as shown in figure 9. The pressure in the hole and the pressure in the sampler are balanced, and the mud water in the measuring main pipe generates a layering phenomenon so as to ensure that the thickness of the sediment layer in the measuring main pipe is consistent with that of the sediment layer in the hole. While not a constant value of 10-15 minutes per se will depend on the particular formation and the operating environment, it is preferred that the pre-injection hole cleaning process leave the host pipe for a longer period of time to ensure stable cement stratification. And reading the scale reading at the muddy water layering position in the measuring main pipe to obtain the thickness of the sediment layer at the bottom of the hole.
3. And (3) measuring the acidity and the alkalinity of the slurry:
and reading the reading shown by the pH meter 4 in the measurement main pipe 1 to detect whether the pH value of the slurry solution meets the standard or not. A pH of > 7 indicates an alkaline slurry solution, and a pH of < 7 indicates that the slurry solution is acidic. A larger pH indicates a more basic property, and a smaller pH indicates a more acidic property. In particular, the drilling and pouring process of special stratum has strict requirements on the pH value of the slurry.
4. And (3) measuring the specific gravity of the slurry in the hole:
the mud weight is the ratio of the mud density to the pure water density.
A balance is matched with the main measurement pipe 1, and as shown in figure 10, the mass of the measurement pipeline is weighed as Wm, the mass of the slurry-containing solution is weighed as Ws, the volume reading is V, and the mass Ww of the same volume of water is weighed.
The mud weight is:
5. measurement of consistency index:
for the consistency test, the timing function of a stopwatch is matched, when the solution is measured at V of the main pipe 11When the scale is calibrated, as shown in fig. 11, the seal at the lowest end of the measuring device is pulled off at the same time when the timing is started, so that the slurry solution can flow out under the action of gravity until the liquid level solution scale is reduced to the set V2And stopping timing at the scales. Reading the leakage solution V1-V2The number of seconds required for the slurry solution. I.e. the consistency of the slurry solution. The common cast-in-situ bored pile measures 500mL, namely V, of the consistency of the slurry1-V2=500 mL. The consistency of underground diaphragm walls or other liquids can be corrected by using clear water to perform consistency test experiments and multiplying a certain coefficient.
And measuring whether the fluidity index of the mud meets the requirement, when the consistency of the solution is higher, adding the content of bentonite in the mud circulating pool to reduce the fluidity of the mud circulating pool, and when the consistency of the solution is lower, adding tap water to increase the fluidity of the mud, thereby accurately guiding the drilling process.
6. And (3) measuring the sand content of slurry in the hole:
the measurement main pipe 1 and the one-way sealing device 2 with the 200-mesh filtering sand screen 9 are combined into a sand content measurement device. As shown in figures 12 and 13, a graduated measuring line 12 is attached to the eye 11 and inverted so that the slurry solution flows out through the filtering sand screen 9 and the scale value V of the original solution is measured3The scale value of the solution at the end of the measurement is V4Frequently obtain V in engineering3-V4=100mL, weigh the mass m of the filtered sandaAnd divided by the product of the mud weight and the mud volume.
Sand content
Or the mass of the same volume of mud can be weighed as mgThen, then
。
The invention can efficiently and accurately measure the main control indexes of the slurry performance such as the slurry proportion, the sand content, the slurry consistency, the pH value and the like at any position (including the bottom of the hole) in the hole in the practical engineering, and overcomes the subjective error of the traditional method for measuring the index of the slurry at the hole opening. The concrete index guiding effect is achieved for accurately guiding the connection of the drilling process, the hole cleaning process and the working procedures of placing concrete and pouring and the like in the reinforcing cage during the construction of the cast-in-situ bored pile.
Simultaneously with the effectual combination of sampling process and measurement process together, make the testing process more simple and convenient effectively overcome because of the erroneous judgement of managers experience not enough to the mud performance index through the mutual combination of assembling of several kinds of parts, after the detection, convenient dismantlement is easily cleared up.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art can change or modify the technical content disclosed above into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (6)
1. A device for instantly and accurately measuring the thickness of a sediment layer and the performance index of slurry is characterized by comprising a measuring main pipe, a one-way sealing device and a one-way throttle valve, wherein the one-way sealing device is arranged above the measuring main pipe; a plugging ball is arranged in the one-way throttle valve, and a thrust piston capable of moving up and down is arranged below the plugging ball;
a pH meter capable of reading is arranged on the inner wall of the measuring main pipe;
a counterweight connecting device is arranged at the lower port of the one-way sealing device;
a counterweight connecting device is arranged at the upper port of the one-way throttle valve;
the counterweight connecting device is connected with a measuring rope with scales;
the specific use method of the device is as follows:
1) sampling:
step 1: the measuring rope with scales, which is moved by the control device, is tied at the one-way sealing device, and all parts are assembled;
step 2: slowly putting the sampler into the slurry solution, simultaneously tensioning a pull rope of a piston at the upper end, and controlling a measuring rope with scales and the pull rope to ensure that the piston and the device are integrally put down at the same speed and keep a motion state of a relative static state; when the whole device falls to the bottom of the hole, the bottom of the whole device, namely the bottom of the one-way throttle valve, contacts the bottom of the hole to provide an upward counter force for the thrust piston to push the thrust piston to move upwards so as to push the plugging ball to move upwards, and slurry solution in the hole enters the measuring main pipe from the bottom of the one-way throttle valve under the action of pressure difference; the plug pull rope is controlled to lower the piston at the end part of the seal at the same time, the piston moves downwards under the action of gravity and water pressure, and the unidirectional seal is realizedThe upper port of the port device is opened, the solution can freely enter the measuring main pipe from the upper port, the measuring device keeps the upper and lower opening state for 10-20 minutes, the reading of the measuring rope with the scales is read in the period, and the reading L of the measuring rope of the measuring device is read1+ total length L of sampling device of sampler body2Length L of the one-way closure3Namely, the measured hole depth is obtained, after the slurry solution enters the measuring main pipe to generate a stable cement layering phenomenon, the upper end piston is pulled to plug the upper end port of the one-way sealing device so as to ensure that the slurry solution with other depths can not mix up the liquid in the sampling device; synchronously pulling up the measuring rope with the scales and the pull rope of the upper sealing piston at the same speed until the orifice to obtain a hole bottom solution;
2) and (3) detection process:
(1) and (3) measuring the hole depth: actual hole depth measurement as described above for the sampling procedure, LHole(s)Reading L of sampler measuring rope1+ length L of the sampling device itself2Length L of the one-way closure3；
(2) And (3) measuring the thickness of the sediment layer at the bottom of the hole:
the whole measuring device is kept still at the bottom of the hole for 10-15 minutes, and water and mud in the hole sequentially enter the measuring main pipe, so that a mud-water boundary is clear, and the thickness of a mud layer can be accurately observed after the measuring main pipe is lifted; the pressure in the hole and the pressure in the sampler are balanced, and the mud water in the measuring main pipe generates a layering phenomenon so as to ensure that the thickness of the sediment layer in the measuring main pipe is consistent with that of the sediment layer in the hole; taking scale readings at the muddy water layering position in the main pipe to be measured as the thickness of the sediment layer at the bottom of the hole;
(3) and (3) measuring the acidity and the alkalinity of the slurry:
reading the reading indicated by a pH meter in the measurement main pipe to detect the pH value of the slurry solution;
(4) and (3) measuring the specific gravity of the slurry in the hole:
the mud proportion is the ratio of the mud density to the pure water density;
weighing the mass Wm of the measurement pipeline, the mass Ws of the slurry-containing solution, the volume reading V and the mass Ww of the same volume of water by using a balance matched with the measurement main pipe;
then the slurry isThe specific weight is as follows:
(5) measurement of consistency index:
the consistency test needs to be matched with the timing function of a stopwatch when the solution is at V of a measurement main pipe1When the scales are calibrated, the timing is started and the seal at the lowest end of the measuring device is pulled off at the same time, so that the slurry solution flows out under the action of gravity until the scales of the solution on the liquid level are reduced to the set V2Stopping timing at the scales; reading the leakage solution V1-V2The second required by the slurry solution is the consistency of the slurry solution;
(6) and (3) measuring the sand content of slurry in the hole:
the measurement main pipe and the one-way sealing device with the sand filtering net are utilized to combine a sand content measuring device, a measuring rope with scales is tied on a hanging ring, and the hanging ring is inverted to enable slurry solution to flow out through the sand filtering net and record and begin to measure the scale value of original solution to be V3The scale value of the solution at the end of the measurement is V4Weighing the mass m of the filtered sandaDividing by the product of the specific gravity of the slurry and the volume of the slurry;
sand content
Or weighing the same volume of mud with mass mgThen, then
。
2. The apparatus of claim 1, wherein the outer surface of the pipe wall of the measurement main pipe is provided with sedimentary layer thickness limits for different formation pile foundations.
3. The device of claim 1, wherein the one-way sealing device, the measuring main pipe and the one-way throttle valve are connected through threads, and sealing rings are arranged at the joints.
4. The device as claimed in claim 1, wherein a removable filtering sand screen is provided in the upper port of the one-way closing means, the filtering sand screen being disposed above the piston.
5. The apparatus of claim 1 wherein the thrust piston comprises a push rod that extends or retracts into the one-way throttle valve and a stop plate adjacent to the blocking ball that closes the one-way throttle valve when in a lowermost position within the one-way throttle valve.
6. The apparatus of any one of claims 1 to 5, wherein the counter-weight coupling is a steel sleeve or a sleeve made of a relatively massive metallic material.
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| CN209028082U (en) * | 2018-09-28 | 2019-06-25 | 中铁隧道局集团有限公司 | A kind of mud takes slag ability measurement device |
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| CN206804342U (en) * | 2017-06-21 | 2017-12-26 | 中交第一公路工程局有限公司 | Drag for slurry cylinder in a kind of priming concrete pile hole bottom |
| CN207268681U (en) * | 2017-09-29 | 2018-04-24 | 广州市诚铁监理咨询有限公司 | Pouring pile hole bottom slurry sampler |
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