CN114112637B - Method and device for detecting concrete strength of miniature pile in peat frozen soil area - Google Patents
Method and device for detecting concrete strength of miniature pile in peat frozen soil area Download PDFInfo
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- CN114112637B CN114112637B CN202111504905.9A CN202111504905A CN114112637B CN 114112637 B CN114112637 B CN 114112637B CN 202111504905 A CN202111504905 A CN 202111504905A CN 114112637 B CN114112637 B CN 114112637B
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- 239000002689 soil Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000003415 peat Substances 0.000 title claims abstract description 16
- 239000012530 fluid Substances 0.000 claims abstract description 152
- 238000012546 transfer Methods 0.000 claims abstract description 29
- 238000007789 sealing Methods 0.000 claims abstract description 24
- 238000005086 pumping Methods 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 claims abstract description 7
- 230000000875 corresponding effect Effects 0.000 claims description 43
- 238000001514 detection method Methods 0.000 claims description 29
- 239000004568 cement Substances 0.000 claims description 17
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
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- 238000010998 test method Methods 0.000 claims 1
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- 238000010257 thawing Methods 0.000 description 7
- 230000015271 coagulation Effects 0.000 description 6
- 238000005345 coagulation Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 238000001879 gelation Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
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- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
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- 230000003028 elevating effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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Abstract
The invention relates to a method for detecting the concrete strength of a miniature pile in a peat frozen soil area, which comprises the following steps: s10: providing a pressure cavity of the sealing kettle body containing concrete with a variable pressure condition by injecting a pressurized fluid, and providing the pressure cavity of the sealing kettle body containing concrete with a variable temperature condition based on a heat transfer effect of the heating fluid; s20: and (3) performing a setting and hardening reaction on the concrete, pumping pressurized fluid into a fluid conveying pipeline extending into the concrete body when the preset moment is reached, observing the form change of the concrete at the pipe orifice of the fluid conveying pipeline through a visual window of the sealed kettle body, and recording a fluid pressure value P corresponding to the preset form at each moment.
Description
Technical Field
The invention relates to the technical field of pile foundation construction in a frozen soil area, in particular to a method and a device for detecting the concrete strength of a miniature pile in a peat frozen soil area.
Background
The frozen soil area is geology and refers to the upper fracture zone of the frozen soil, the rock layer and the frozen bedrock with the annual average temperature under the negative temperature condition for a long time. Frozen soil is a soil medium which is extremely sensitive to temperature, contains abundant underground ice, and a certain amount of unfrozen water exists in the frozen soil.
Frozen soil has a certain rheological property, and the long-term strength of the frozen soil is far lower than the instant strength characteristic. Because of these characteristics, construction of engineering structures in frozen soil areas must face two major hazards: frost heaving and thawing, frost heaving generally refers to segregated frost heaving caused by moisture migration in soil mass frost heaving; and thawing and sinking means that the temperature of a frozen layer rises, frozen soil is thawed, ice crystals in the frozen soil are thawed into water, the volume of a soil body is reduced, and cracks formed during frost heaving of the original structure of the soil body are closed during thawing to generate thawing and sinking.
Microposts are usually composed of a permanent iron sleeve with an inner diameter of not more than 300mm, a load-bearing cage or a set of reinforcement cages in the centre of the hole and concrete filling the voids between them. Before the site construction of a concrete pile foundation in a frozen soil area, most engineering parties pay attention to safety risks and quality control in the early freezing stage and the excavation process, and synchronous monitoring is basically completed through corresponding monitoring equipment, and due to the fact that the frost heaving, thawing and sinking changes of the frozen soil area have certain hysteresis, the knowledge of relevant personnel on the thawing and sinking mechanism and the effect thereof of the frozen soil area is insufficient, and more problems often occur in the actual site construction process, particularly in the soil thawing and consolidation stage.
For constructing a frozen soil area structure, the hydration heat generated during on-site concrete pouring can inject external heat into a foundation so as to disturb the original frozen soil for many years, so that the structural stability of the frozen soil area can be influenced, the micro pile can improve the effective bearing capacity of the foundation to strengthen the stability of the foundation, the real-time cementing strength of the concrete has an important influence on the strength performance of the micro pile structure and the stability of the frozen soil area during concrete pouring, and due to various unchanged factors of on-site construction and the relative hysteresis of data monitoring, a large number of detection devices and methods for indoor simulation test of the cementing strength of the concrete are provided in the prior art.
However, the following problems remain common in the prior art: visual monitoring of the concrete gelation process cannot be realized, namely microscopic changes of the concrete in each coagulation period cannot be observed, and the change trend of the gelation strength and time related changes cannot be obtained based on the difference of the concrete in each coagulation period, so that only a final evaluation result of the concrete gelation strength is obtained, and the method is not comprehensive and accurate enough; secondly, the microscopic state change of the concrete cannot be intuitively monitored, so that the invasion resistance of the concrete to stratum fluid is not remarkably embodied; in addition, the stratum environment which can be simulated in the prior art is limited, and particularly, the simulation of the corresponding pressure and temperature states of the in-situ stratum under different depths is lacking, so that the experimental result and data are usually unreliable, and a certain convincing force is lacking; more importantly, when engineering is carried out according to the experimental simulation data, accurate and effective data support cannot be provided for site construction, so that unexpected construction cost can be increased, and particularly, problems which are difficult to predict can be caused additionally for pile foundation construction in a frozen soil area.
Accordingly, there remains a need in the art for at least one or more of the technical problems that remain to be solved. The invention aims to provide a detection method and a detection device with visual and high simulation effects for measuring the cementing strength change of micro pile concrete in a frozen soil area in real time in each coagulation period.
Furthermore, there are differences in one aspect due to understanding to those skilled in the art; on the other hand, since the applicant has studied a lot of documents and patents while making the present invention, the text is not limited to details and contents of all but it is by no means the present invention does not have these prior art features, but the present invention has all the prior art features, and the applicant remains in the background art to which the right of the related prior art is added.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a simulation detection method and device for the strength of micro pile concrete in a peat and frozen soil area, and aims to solve at least one or more technical problems in the prior art.
In order to achieve the above purpose, the invention provides a simulation detection method for the strength of micro pile concrete in a peat frozen soil area, which at least comprises the following steps: s10: providing a pressure cavity of the sealing kettle body containing concrete with a variable pressure condition by injecting a pressurized fluid, and providing the pressure cavity of the sealing kettle body containing concrete with a variable temperature condition based on a heat transfer effect of the heating fluid; s20: and (3) performing a setting and hardening reaction on the concrete, pumping pressurized fluid into a first fluid conveying pipeline extending into the concrete body when the preset moment is reached, observing the form change of the concrete at the pipe orifice of the first fluid conveying pipeline through a first transparent window of the sealing kettle body, and recording a fluid pressure value P corresponding to the preset form at each moment.
Preferably, the step S20 further comprises: before the initial setting of the concrete, recording a first demulsification pressure P when bubbles of a predetermined size are generated at the orifice of the first fluid conveying pipeline 1 And a second breaking pressure P when at least a single complete bubble is generated at the orifice of the first fluid delivery line 2 At this time the concrete has a bond strength of alpha P 1 +βP 2 Wherein α=β=0.5; recording the demulsification pressure P when the concrete at the orifice of the first fluid conveying pipeline fluctuates, vibrates or cracks during initial setting of the concrete 3 And the cementing strength of the concrete at the corresponding moment is characterized by the concrete.
Preferably, the detection method of the present invention further comprises: after the steps S10-S20, the concrete in the pressure cavity is enabled to continuously carry out a setting and hardening reaction, and when a preset moment is reached, the pressurized fluid is pumped into a second fluid conveying pipeline extending into the pressure cavity side pressure chamber of the sealing kettle body, so that the pressurized fluid enters a gap between the concrete and the wall surface of the sealing kettle body; when the loosening generated between the cement sheath and the inner wall of the kettle body is observed through the second transparent window corresponding to the second fluid conveying pipeline, the pumping of the fluid is stopped, and the pumping pressure at the moment is recorded to represent the cementing strength between the simulated cement sheath and the steel casing, wherein the pumping pressure is positively correlated with the cementing strength between the cement sheath and the well wall.
Preferably, as the pressure in the first fluid transfer line increases, and when bubbles form at the orifice of the first fluid transfer line and float or a crack is generated, a pressure value P corresponding to when the real-time flow rate of the pressurized fluid fluctuates is defined as the cementing strength of the concrete.
Preferably, the invention provides a device for detecting the concrete strength of a miniature pile in a peat and frozen soil area, which at least comprises: a sealed vessel having a pressure chamber for receiving concrete, and a first pressure chamber and a second pressure chamber connected to a top and a side of the pressure chamber, respectively, a heating unit configured to supply heat energy to the vessel, wherein the first pressure chamber is in communication with an input line for injecting a pressurized fluid into the first pressure chamber, a first fluid transfer line is connected to a side of the sealed vessel, and at least a portion of an end of the first fluid transfer line is configured to be inserted into the concrete in the pressure chamber from the side, wherein at least a portion of a surface of the sealed vessel corresponding to the first fluid transfer line is configured as a first transparent window having graduations.
Preferably, at least one second fluid conveying pipeline is further connected to the side face of the sealing kettle body, and at least part of the output end of the second fluid conveying pipeline is configured to extend into the second pressure chamber, wherein at least part of the surface of the sealing kettle body corresponding to the second fluid conveying pipeline is configured as a second transparent window with graduations.
Preferably, the first fluid delivery line is configured as a detachable transparent pipeline, and the first fluid delivery line is parallel or perpendicular to the first transparent window, wherein the first fluid delivery line is disposed in a gap with the first transparent window.
Preferably, the first pressure chamber is connected to a pressurized fluid pump unit with a buffering device, which is configured to inject pressurized fluid into the first pressure chamber so that the pressure chamber containing the concrete is under the corresponding formation pressure.
Preferably, the pressure chamber top of the sealing attachment is provided with at least one isolating layer for separating the pressurized fluid from the concrete, and the pressurized fluid is a liquid that is mutually immiscible with the concrete.
Preferably, the concrete strength detecting apparatus of the present invention further comprises: a flow rate detection device for acquiring the flow rate of the pressurized fluid in the fluid delivery line in real time; a fluid delivery device for injecting pressurized fluid into the sealed vessel; the pressure detection device is used for acquiring the pressure value P of the pressurized fluid in real time; wherein each device is disposed on each fluid input line and communicatively coupled to a control portion.
The beneficial technical effects of the invention include:
1. the change of bubbles at the orifice of the pressurizing pipe can be visually observed through the visual window so as to determine the change condition of the cementing strength of the concrete in the coagulation hardening process, and the cementing strength of the concrete can be determined by combining the reading of a high-precision flowmeter or a pressure meter, so that the whole monitoring process is simple and easy to operate, and the data is accurate and reliable;
2. the corresponding ground temperature and the ground pressure of the micro pile construction section in the frozen soil area can be referred to, so that the concrete is coagulated and hardened under the condition of the corresponding ground temperature and the ground pressure, the cementing strength of the concrete can be measured at any hydration moment of the concrete, and a change curve of the cementing of the concrete relative to time can be obtained;
3. before construction of a site problematic stratum, a ground test can be performed, concrete is placed under the ground temperature and the ground pressure of the corresponding stratum, and is coagulated and hardened, so that whether the concrete meets the strength requirement of a building protection structure is checked, and the cost increase and construction period delay caused by misoperation can be greatly reduced;
4. the device can also be used for detecting the cementing strength of concrete in the process of exploitation and cementing of conventional oil gas and unconventional energy, namely, after waiting for hardening of the concrete and cementing of the concrete with the inner wall of the kettle body, the cementing strength of an interface of the cementing is obtained by measuring a pressure value;
5. the device can be used for the construction of the future underground space, and can simulate the development condition of the concrete cementing strength of the constructed underground space building in the construction process, such as the on-site concrete filling pile (the condition of underground water development), so that the cost of the construction of the future underground space can be greatly reduced;
6. the device can be used for simulation experiments before geological disaster prevention engineering construction so as to provide real and reliable experimental basis for implementation of corresponding protection engineering, and thus, before the corresponding engineering is developed, the construction parameters of each construction link related to the cement coagulation process are controlled and adjusted, so that the cementing strength of concrete can better meet the strength requirement of geological disaster frequent sections on corresponding protection structures.
Drawings
FIG. 1 shows a process flow diagram of a peat soil region micro pile in accordance with a preferred embodiment;
FIG. 2 is a schematic diagram of a preferred structure of a device for simulating and detecting the strength of micro pile concrete in a peat frozen soil area;
FIG. 3 is a preferred partial enlarged view of a first transparent window of a preferred embodiment provided by the present invention;
FIG. 4 is a schematic illustration of a preferred configuration of a first fluid transfer line within a first transparent window according to one preferred embodiment of the present invention;
FIG. 5 is a preferred partial enlarged view of a second transparent window of a preferred embodiment provided by the present invention;
fig. 6 is a schematic flow chart of a method for simulating and detecting the concrete strength of a micro pile in a peat frozen soil area.
List of reference numerals
101: a mounting base; 102: a lifting frame; 103: sealing the kettle body; 104: a heating unit; 105: an isolation layer; 106: a buffer device; 107: a flow rate detection device; 108: a fluid delivery device; 109: a control unit; 110: a pressure detection device; 1a: a first transparent window; 1b: a second transparent window; 2a: a first fluid transfer line; 2b: a second fluid transfer line; PF (: pressurized fluid; CP: concrete; 3a: sealing the interface of the kettle body; 3b: and (5) cementing an interface.
Detailed Description
The following detailed description refers to the accompanying drawings.
Fig. 1 shows a construction process of a micro pile, and specifically, a basic construction process of a micro pile includes: s1, drilling a drilling machine to locate, S2, forming holes, S3, cleaning the holes, S4, placing reinforced materials and backfilling stones, S5, grouting and piling, wherein the S5, grouting and piling sequentially comprises the steps of S51, preparing slurry, S52, primary grouting, S53, secondary grouting and the like.
In the prior art, the cementing strength of concrete is generally expressed by the viscosity and the pressure of the concrete, but the method for converting the viscosity of the concrete into the cementing strength of the concrete is widely used at present, however, the cementing strength of the concrete obtained through the viscosity conversion is not visual enough. Therefore, the invention adopts a pressure mode to represent the cementing strength of the concrete, namely, the demulsification pressure of the fluid in the concrete is used for representing the cementing strength of the concrete.
According to a preferred embodiment, the invention provides a simulation detection method for the concrete strength of a micro pile in a peat frozen soil area, which can be used for simulating and detecting the measurement of the corresponding cementing strength of concrete at each coagulation moment in the grouting process in the pile foundation construction field of the frozen soil area, and specifically, the method can comprise the following steps:
s10: providing a pressure cavity of the sealing kettle body containing concrete with a variable pressure condition by injecting a pressurized fluid, and providing the pressure cavity of the sealing kettle body containing concrete with a variable temperature condition based on a heat transfer effect of the heating fluid;
s20: and (3) performing a setting and hardening reaction on the concrete in the pressure cavity, pumping pressurized fluid into a fluid conveying pipeline extending into the concrete body when a preset moment is reached, observing the form change of the concrete at the pipe orifice of the fluid conveying pipeline through a visual window of the sealing kettle body, and recording a fluid pressure value P corresponding to a preset form at each moment.
Preferably, the pressure value of the fluid may be obtained by a fluid pressure detection device.
According to a preferred embodiment, the step of observing microscopic changes in the concrete at the orifice of the first fluid transfer line through the first transparent window and recording the pressure value P representing the bond strength of the concrete at the same time comprises:
before the initial setting of the concrete, the concrete generates bubbles with a certain size due to the pressure generated at the pipe orifice of the first fluid conveying pipeline, and when the diameter of the bubbles is observed to be about 1mm through the first transparent window on the sealing attachment, the pressure at the moment is the first demulsification pressure P 1 With the continuous pumping of the pressurized fluid, the concrete generates complete bubbles, and the pressure at the moment is the second demulsification pressure P 2 The cementing strength of the concrete at the corresponding moment is alpha P 1 +βP 2 And thus characterizes the cement strength of the concrete at the corresponding moment, and preferably α=β=0.5; when the concrete is initially set, the concrete is coagulated into paste, and the cementing strength at the moment is the pressure value reflected by the fluid pressure and/or flow detection equipment when the concrete of the first fluid conveying pipeline fluctuates, vibrates or cracks, the cementing strength of the concrete at the corresponding moment is P 3 。
For this reason, based on the above-mentioned method for detecting the concrete strength of the micro pile in the peat and frozen soil area, the invention provides a device for detecting the concrete strength of the micro pile in the peat and frozen soil area by using the method, as shown in fig. 2, the device may include one of the following components:
a mounting base 101;
a lifting frame 102 composed of two independent brackets disposed on both sides of the top of the mounting base 101;
a sealed vessel 103 which is installed above the installation base 101 in such a manner as to be connected to the elevating frame 102 and which has a pressure chamber for accommodating concrete to be measured;
a heating unit 104, which is installed between the sealed vessel 103 and the installation base 101 in such a manner as to be connected to the elevation frame 102, and which is configured to supply heat energy to the sealed vessel 103.
According to a preferred embodiment, when it is desired to provide the temperature of the corresponding formation to the sealed vessel 103, the heating unit 104 may be raised to a desired position by the elevator 102 to heat the sealed vessel 103.
In particular, to simulate an environment where formation temperatures range from approximately zero degrees to hundreds of degrees celsius, the heating unit 104 preferably employs a water-oil bath or sand bath to provide a high temperature environment above hundreds of degrees celsius.
According to a preferred embodiment shown in fig. 2, a first pressure chamber is arranged above the pressure chamber of the sealed tank 103, the first pressure chamber being configured to accommodate a fluid medium having a pressure such that a pressure state corresponding to different formation depths is provided to the concrete in the pressure chamber. To this end, a pressurized fluid pump unit with a buffer device 106 is connected to the top of the first pressure chamber, by means of which a fluid medium, such as a fluid medium having a certain pressure, can be supplied into the first pressure chamber to provide the concrete in the pressure chamber with the pressure state of the respective stratum. Preferably, the buffer device 106 is a buffer tank for stabilizing the pressure of the fluid so as to gently and slowly press the fluid into the sealed vessel 103.
Further, a second pressure chamber (not shown) may be provided on the side of the pressure chamber of the sealed vessel 103, and a fluid medium having a certain pressure may be supplied to the second pressure chamber by a pump device, similar to the first pressure chamber, so as to simulate the pressure state corresponding to the intrusion of each formation fluid at different depths into concrete or a cement sheath.
According to a preferred embodiment shown in fig. 2, at least part of the surface of the sealing pot 103 corresponding to the pressure chamber is configured as a first transparent window 1a, and at least part of the side of the sealing pot 103 corresponding to the second pressure chamber is configured as a second transparent window 1b. Preferably, the first transparent window 1a and the second transparent window 1b may be configured in the form of magnifying glass in order to clearly observe microscopic changes of concrete inside the pressure chamber and microscopic changes of concrete when external fluid is intruded. Further, scale marks can be arranged on the first transparent window 1a and the second transparent window 1b, so that an experimenter can observe the change of fluid bubbles in the sealed kettle body through the transparent windows and record corresponding data.
According to a preferred embodiment shown in fig. 2, the pressure chamber top of the sealed kettle body 103 is provided with an isolating layer 105 for isolating the pressurized liquid in the first pressure chamber above it from the concrete inside the pressure chamber. Preferably, the pressurized fluid injected into the first pressure chamber is a liquid that is immiscible with concrete.
According to a preferred embodiment shown in fig. 2, a plurality of fluid transfer lines are connected to the sides of the sealed vessel 103. Preferably, a valve for controlling the on-off of the input pipeline is arranged above each fluid conveying pipeline.
According to a preferred embodiment shown in fig. 2, a first fluid transfer line 2a is connected to the side of the sealed vessel 103, at least part of the end of the first fluid transfer line 2a being configured to be inserted sideways into the concrete in the pressure chamber, and at least part of the end of the first fluid transfer line 2a extending into the concrete being in the visible view of the first transparent window 1a, as shown in fig. 3.
Further, as shown in fig. 4, when the first fluid transfer line 2a is a transparent glass tube, it is necessary to keep the first transparent window 1a parallel or perpendicular to the wall surface with a certain gap (for example, about 1 mm).
Preferably, the first fluid transfer line 2a may be provided in a removable configuration to facilitate replacement after the experiment is completed. In addition, the fluid (gas or liquid) fed through the first fluid feed line 2a may be selected according to the specific circumstances. In particular, if the first fluid transfer line 2a is in a transparent form, it is possible to observe through it whether concrete is counter-invading into the first fluid transfer line 2 a.
According to a preferred embodiment shown in fig. 2, the inlet line in which the first fluid transfer line 2a is located is provided with two branch lines which are connected to the side of the sealed tank 103 and which each extend into the second pressure chamber at the side of the sealed tank 103. For ease of understanding, two branch lines extending into the second pressure chamber at the side of the sealed vessel 103 are defined as second fluid transfer lines 2b.
According to a preferred embodiment shown in fig. 5, the end of the second fluid transfer line 2b is in the visible region of the second transparent window 1b, and in particular, the end of the second fluid transfer line 2b is located between the sealing pot interface 3a of the sealing pot 103 and the pressure chamber.
According to a preferred embodiment shown in fig. 2, the various input lines for delivering pressurized fluid are mechanically and/or electrically connected to a control 109.
According to a preferred embodiment shown in fig. 2, the apparatus further comprises a flow rate and velocity detection device 107, a fluid delivery device 108 and a pressure detection device 110 arranged above each fluid delivery line, each device being communicatively connected to the control 109. Preferably, the control portion 109 is an integrated intelligent control unit, which is used for controlling the start and stop of each device on each fluid delivery pipeline and adjusting the working mode or state of each device.
Preferably, the flow rate and flow rate detection device 107 is a flowmeter for measuring the flow rate of fluid in each fluid delivery line, and the concrete bond strength can be determined by real-time readings of the flow rate and flow rate detection device 107 with high accuracy. For example, in the early stage of pressurization, as the pressure in the fluid delivery pipeline increases, the fluid flow rate displayed in real time by the flow rate detection device 107 is relatively uniform, when bubbles form at the orifice of the fluid delivery pipeline and float upwards or a crack is generated, the pressure in the fluid delivery pipeline is accompanied by tiny fluctuation, and the fluid flow rate displayed in real time by the flow rate detection device 107 is always fluctuated to a certain extent, and the pressure corresponding to the fluctuation moment is the cementing strength of the concrete.
Preferably, the fluid delivery device 108 is a booster pump for pumping pressurized fluid into the sealed vessel 103.
Preferably, the pressure detecting device 110 is a pressure gauge for reading the pressure value of the pressurized fluid in real time, and the pressure detecting device 110 has high accuracy, which ensures the true reliability of the data in the entire analog detecting process.
For easy understanding, the working principle and the detection method of the device are described in detail by taking the device as an example.
When the peat frozen soil area micro pile concrete strength detection device is used, the concrete to be detected is accommodated in the sealed kettle body 103, the concrete is subjected to a setting and hardening reaction, and according to the detection requirement, a pressurized fluid is injected into a first pressure chamber above the pressure chamber through a pressurized fluid pump unit to provide the pressure chamber containing the concrete with the pressure state of the corresponding stratum, and a heating unit 104 is used to provide the pressure chamber containing the concrete with the temperature state of the corresponding stratum, after the setting and hardening reaction of the concrete is performed for a certain time, a fluid conveying device 108 is started to convey the pressurized fluid into the concrete through a first fluid conveying pipeline 2a, and meanwhile, the pressure value P at the same time is recorded based on microscopic changes of the concrete at the mouth of the first fluid conveying pipeline 2a observed from a first transparent window 1a: before the initial setting of the concrete, the concrete generates bubbles (for example, about 1 mm) with a certain size at the first transparent window 1a due to the fluid pressure, and the pressure at this time is the first demulsification pressure P 1 When the concrete generates at least a single complete bubble at the first transparent window 1a, the pressure at this time is calculated to be the second demulsification pressure P 2 The cementing strength of the concrete at the corresponding moment is alpha P 1 +βP 2 And thus characterizes the cement strength of the concrete at the corresponding moment, and preferably α=β=0.5; when the concrete is initially set, the concrete is gradually coagulated into paste, the cementing strength at the moment is the pressure value reflected by the pressure gauge when the concrete at the pipe orifice of the first fluid conveying pipeline 2a fluctuates, vibrates or generates cracks, and the cementing strength of the concrete at the moment is P 3 。
According to a preferred embodiment, the detection device of the invention can also be used for the analogue measurement of the bond strength between the casing and the concrete/cement paste in the field of oil and gas cementing at the corresponding ground temperature and ground pressure. Specifically, after the cementing strength of the concrete at each setting time is measured through the first fluid conveying pipeline 2a in a simulation manner, the concrete in the sealed kettle body 103 is enabled to continue to undergo a setting hardening reaction, after a preset time is reached, the second fluid conveying pipeline 2b is opened, smooth and slow fluid is continuously pumped into a gap between the cement sheath and the inner wall of the sealed kettle body 103, and observation is carried out through the second transparent window 1b on the side surface of the sealed kettle body 103, when looseness is observed between the cement sheath and the inner wall of the kettle body, pumping of the fluid is stopped, and pumping pressure at the moment is recorded, wherein the pumping pressure is the cementing strength between the cement sheath and the steel sleeve, and the pumping pressure is in positive correlation with the cementing strength between the cement sheath and the well wall.
Preferably, based on the peat frozen soil region micro pile concrete strength detection device provided by the invention, the stratum environment corresponding to the construction section of the frozen soil region micro pile can be simulated in advance, namely the temperature and pressure states of the corresponding stratum can be simulated. In order to meet the requirement of the corresponding micro pile structure on the concrete cementing strength, the cementing strength of the concrete corresponding to the formation temperature and pressure conditions obtained through experimental simulation can be compared with a theoretical value, so that various parameters in the actual cement construction process, such as the proportion of the concrete, the temperature, the pouring flow and the like, are adjusted based on experimental data.
In particular, the invention can also be applied to the field of geological disaster prevention, such as construction of retaining walls, slide-resistant piles and anchor cable structures, and the field of engineering grouting, such as secondary grouting of pile ropes of underground walls, post-pile grouting in the process of underground engineering construction, seepage-proofing grouting in the process of subway tunnel construction and the like.
It should be noted that the above-described embodiments are exemplary, and that a person skilled in the art, in light of the present disclosure, may devise various solutions that fall within the scope of the present disclosure and fall within the scope of the present disclosure. It should be understood by those skilled in the art that the present description and drawings are illustrative and not limiting to the claims. The scope of the invention is defined by the claims and their equivalents. The description of the invention encompasses multiple inventive concepts, such as "preferably," "according to a preferred embodiment," or "optionally," all means that the corresponding paragraph discloses a separate concept, and that the applicant reserves the right to filed a divisional application according to each inventive concept.
Claims (10)
1. The method for detecting the concrete strength of the micro pile in the peat frozen soil area is characterized by comprising the following steps of:
s10: providing a pressure chamber of the sealing kettle body containing concrete with a variable pressure condition by injecting a pressurized fluid into a first pressure chamber arranged above the pressure chamber of the sealing kettle, and providing the pressure chamber of the sealing kettle body containing concrete with a variable temperature condition based on a heat transfer effect of the heating fluid;
s20: the concrete is subjected to setting and hardening reaction, when the preset moment is reached, the pressurized fluid is pumped into a first fluid conveying pipeline which stretches into a concrete body, the form change of the concrete at the pipe orifice of the first fluid conveying pipeline is observed through a first transparent window of the sealing kettle body, and the fluid pressure value P corresponding to the preset form at each moment is recorded, wherein the first demulsification pressure P when bubbles with preset size are generated at the pipe orifice of the first fluid conveying pipeline is recorded before the initial setting of the concrete 1 And a second breaking pressure P when at least a single complete bubble is generated at the orifice of the first fluid delivery line 2 Obtaining the cementing strength of the concrete at the moment as alpha P 1 +βP 2 The method comprises the steps of carrying out a first treatment on the surface of the And recording the breaking pressure P when the concrete at the orifice of the first fluid conveying pipeline fluctuates, vibrates or cracks during initial setting of the concrete 3 The cement strength of the concrete at this point in time was characterized.
2. The method according to claim 1, wherein α=β=0.5 in the step S20.
3. The method of detection according to claim 1, wherein the method further comprises:
after the steps S10-S20, enabling the concrete in the pressure cavity to continuously undergo a setting and hardening reaction, and pumping the pressurized fluid to a second fluid conveying pipeline extending into a pressure cavity side pressure chamber of the sealed kettle body at a preset moment so as to enable the pressurized fluid to enter a gap between the concrete and the wall surface of the sealed kettle body;
when the occurrence of looseness between the cement sheath and the inner wall of the kettle body is observed through the second transparent window corresponding to the second fluid conveying pipeline, the pumping of the fluid is stopped, the pumping pressure at the moment is recorded to represent the cementing strength between the simulated cement sheath and the steel sleeve,
the pump-in pressure is positively correlated with the cementing strength between the cement sheath and the well wall.
4. The method according to claim 1, wherein as the pressure in the first fluid transport line increases, and when bubbles are formed at the orifice of the first fluid transport line and float upward or a crack is generated, a pressure value P corresponding to the fluctuation of the real-time flow rate of the pressurized fluid is defined as the cementing strength of the concrete.
5. A test device for use in the test method of any one of the preceding claims, the test device comprising at least:
a sealed kettle body (103) which is provided with a pressure cavity for containing concrete, the top and the side surface of the pressure cavity are respectively connected with a first pressure chamber and a second pressure chamber,
a heating unit (104) configured to supply heat energy to the sealed vessel (103),
wherein,
the first pressure chamber communicates with an input line for injecting pressurized fluid into the interior thereof,
a first fluid delivery line (2 a) is connected to the side of the sealed kettle body (103), and at least part of the end of the first fluid delivery line (2 a) is configured to be inserted into the concrete in the pressure cavity from the side, wherein at least part of the surface of the sealed kettle body (103) corresponding to the first fluid delivery line (2 a) is configured as a first transparent window (1 a) with graduations.
6. The device according to claim 5, wherein at least one second fluid transfer line (2 b) is further connected to the side of the sealed vessel (103), and at least part of the output end of the second fluid transfer line (2 b) is configured to extend into the second pressure chamber,
wherein at least part of the surface of the sealed kettle body (103) corresponding to the second fluid conveying pipeline (2 b) is configured as a second transparent window (1 b) with graduations.
7. The device according to claim 5, wherein the first fluid transfer line (2 a) is configured as a detachable transparent tube, and the first fluid transfer line (2 a) is parallel or perpendicular to the first transparent window (1 a),
wherein the first fluid delivery line (2 a) is arranged in a gap with the first transparent window (1 a).
8. The apparatus according to claim 5, wherein the first pressure chamber is connected to a pressurized fluid pump assembly having a buffering device (106), the pressurized fluid pump assembly being configured to inject pressurized fluid into the first pressure chamber such that the pressure chamber containing concrete is under a corresponding formation pressure condition.
9. The device according to claim 5, characterized in that the pressure chamber is provided on top with at least one isolating layer (105) for separating the pressurized fluid from the concrete.
10. The detection apparatus according to claim 5, characterized in that the detection apparatus further comprises:
a flow rate detection device (107) for acquiring in real time the flow rate of the pressurized fluid in the fluid delivery line;
a fluid delivery device (108) for injecting a pressurized fluid into said sealed vessel (103);
a pressure detection device (110) for acquiring in real time a pressure value P of the pressurized fluid;
wherein each device is disposed over each fluid input line and is communicatively coupled to a control (109).
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