CN1837802A - Electrical resistivity survey method for monitoring construction quality of reinforce concrete and prestressed concrete - Google Patents
Electrical resistivity survey method for monitoring construction quality of reinforce concrete and prestressed concrete Download PDFInfo
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- CN1837802A CN1837802A CN 200510033608 CN200510033608A CN1837802A CN 1837802 A CN1837802 A CN 1837802A CN 200510033608 CN200510033608 CN 200510033608 CN 200510033608 A CN200510033608 A CN 200510033608A CN 1837802 A CN1837802 A CN 1837802A
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Abstract
This invention relates to an electrical resistivity survey method for monitoring construction quality of reinforce concrete and prestressed concrete which comprises, applying electric detection method to test the w/c value and compressive strength of concrete mixture and cement grout, in-situ monitoring quality with quantitative index to prevent void, honeycomb and other problems as lack of vibration, as well as the concrete segregation as over vibration. This invention can monitor pipe state during grouting to ensure quality and eliminate hidden danger.
Description
The scene that the present invention relates to reinforced concrete and prestressed concrete construction quality is detected and monitoring technique.
Reinforced concrete and prestressed concrete construction quality problems mainly show and are:
1) concrete strength field control difficulty, segregation, bleeding, rainwater and construction water etc. also can have influence on the actual water cement ratio and the intensity of concrete part;
2) concrete pouring quality is poor, the deficiency of vibrating can cause problems such as cavity, honeycomb, dew muscle, crossing shakes then phenomenons such as concrete disintegration, pitted skin can occur, and non-uniform beam, prestress anchor head and prestress pipe below, reinforcing bar compact district etc. all are the positions that concrete is difficult to build;
3) prestress pipe of especially curved rope and long rope, because mud jacking leakiness, there are air, ponding in the pipe, and the grout bleeding etc., make pipeline top and cable core form cavity, under the effect of pressure, the temperature difference, balloon agent gas etc., the normal passage that is communicated to mud jacking hole or plasma discharge hole that forms has a strong impact on the corrosion formation the cable wire of high-stress state is stressed.
These problems not only influence the outward appearance of works, more influence intensity, bearing capacity and the permanance of structure.Owing to lack effectively on-the-spot the detection in real time and monitoring means, be the major reason of puzzlement civil engineering construction quality all the time; Prestress pipe mud jacking leakiness also is the serious common quality defect of prestressed reinforced concrete construction.
The purpose of this invention is to provide that a kind of principle is simple, method is reliable, easy to use, can be deep into and implement the reinforced concrete and the prestressed concrete construction quality monitoring technology that detect in framework of steel reinforcement and the prestress pipe, adopt electric exploring method to detect the water cement ratio and the compressive strength of concrete mix and grout, by the concrete pouring quality of quantizating index on-site supervision, preventing owes to shake causes concrete problems such as cavity, honeycomb, dew muscle to occur, and reaching shakes the phenomenon of concrete disintegration occurs; By prestress pipe mud jacking process inner air tube, ponding, thin pulp being got rid of the monitoring of situation, the monitoring of situations such as the detection by quantitative of cement consistency and process of setting bleeding reaches and guarantees squeezing quality, eliminates the purpose of serious hidden danger of quality.
The invention is characterized in that electrical resistivity survey instrument (1) is connected to the sensor of being made up of fixed electorde (13) (3) by lead (2), sensor (3) is sent in concrete mix (4) or the grout (5), measure the resistance or the resistivity of concrete mix (4) or grout (5), different its resistance of match ratio or the also different principle of resistivity according to concrete mix (4) or grout (5), detect the match ratio situation of change of concrete mix (4) or grout (5), analyze its match ratio, water cement ratio, intensity and pouring quality reach the purpose that reinforced concrete and prestressed concrete construction quality are detected and monitor.
Different media has different resistance or resistivity, can cause that respective change takes place metering circuit electrical measurement value (as parameters such as voltage, electric currents).Concrete mix of identical match ratio (4) or grout (5) have certain resistance or resistivity, sensor (3) with fixed electorde (13) composition, when concrete mix (4), grout (5) is because of match ratio, or bleeding when building, added when adding water, respective change can take place in the electrical measurement value of concrete mix (4) or grout (5), and water cement ratio has corresponding variation relation with cooperating when, also have correlationship with 28 days compressive strength of concrete or grout, therefore can utilize electric exploring method can be used to detect the water cement ratio and the compressive strength of concrete mix (4) or grout (5).When the coarse aggregate of concrete mix (4), the increase of fine aggregate ratio, the resistance value of medium increases; When the grout content of concrete mix (4) increases, the resistance value of medium reduces, therefore the coarse aggregate of concrete mix (4), fine aggregate, grout separate when producing segregation phenomenon, can obviously have influence on the variation of electrical measurement value, utilize the electrical measurement value to change the pouring quality state of energy qualitative detection concrete mix, prevent that problems such as pitted skin, honeycomb, cavity, dew muscle, segregation from appearring in concrete, plays the effect of construction monitoring.Utilize the electrical measurement value to change and be used to detect the eliminating situation of prestress pipe inner air and ponding, the water ash of grout or the situation of change of denseness, the science control mud jacking closed pore time.
The invention is characterized in that sensor (3) is installed in an end of rod member (6), rod member (6) can be hollow-core construction, lead (2) can pass through from the centre of rod member (6), with the pouring quality of inserted mode with the concrete mix (4) at place, machine testing template (7) deep.Therefore adopt electric exploring method monitored concrete pouring quality, can utilize feeler lever to be deep into narrow and small template (7), reinforcing bar (11) skeleton internal implementation with machine testing.
The another way of concrete pouring construction quality monitoring be with one or more sensors (3) fixed forms such as double faced adhesive tape (8), colligation are installed on the inwall of template (7) by adopting, below prestress anchor head (9) surface, prestress pipe (10) outer wall, the concrete such as compact district of reinforcing bar (11) position that is difficult to build, fixed point detects the pouring quality of concrete mix (4).
Use the squeezing quality of electric exploring method monitoring prestress pipe, it is characterized in that sensor (3) is sent to prestress pipe (10) inside, be used to detect the eliminating situation of prestress pipe (10) inner air (14), ponding (12) and the squeezing quality of grout (5), the qualitative identification cement consistency, the science control mud jacking closed pore time.Sensor (3) is sent to prestress pipe (10) inside, also can monitors the eliminating situation of the inner ponding of mud jacking preceding pipeline (12); Also can be used for detecting whether spillage or scurry slurry of concreting or pipeline pneumatic mortar process pipeline, in order to avoid cause line clogging.On two medial surfaces that are installed in positions such as the top of the recessed section of plastics prestress pipe (15) or bottom with top electrode (13) or sensor (3) in advance, lead (2) passes through from concrete (16), help improving on the characteristic portion plastics prestress pipe (15), the sensitivity of the eliminating situation of the interregional air of two electrodes (13) (14), ponding (12) monitoring and the accuracy that the squeezing quality of grout (5) is detected, but and tracing and monitoring grout (5) process of setting whether bleeding or shrinkage phenomenon take place.
Fig. 1 is with plug-in type monitored concrete pouring construction quality synoptic diagram.
Fig. 2 is with flush type monitored concrete pouring construction quality synoptic diagram.
Fig. 3 is a prestress pipe mud jacking construction quality monitoring synoptic diagram.
Fig. 4 is a fixed point monitoring prestress pipe mud jacking construction quality synoptic diagram.
The present invention utilizes different media that different resistance or resistivity are arranged, can cause that the principle of respective change takes place metering circuit electrical measurement value (as parameters such as voltage, electric currents), electrical resistivity survey instrument (1) is connected to the sensor of being made up of fixed electorde (13) (3) by lead (2), when the match ratio of concrete mix (4) or grout (5) changes, corresponding variation also takes place in its resistance or resistivity, can be used to predict the water cement ratio and the compressive strength of concrete mix (4) or grout (5); Its electrical measurement value also changes when segregation takes place concrete, and the degree of utilizing the concreting of electrical measurement value mutation analysis to vibrate prevents to occur because of owing to shake problems such as honeycomb, cavity, dew muscle; Reaching shakes causes concrete disintegration, plays the effect of concrete pouring construction quality monitoring.Sensor (3) is installed in an end of rod member (6), can be inserted into narrow and small template, framework of steel reinforcement internal implementation with machine testing, can detect the concrete pouring quality in template depths, and because of segregation, bleeding or add water etc., cause the local phenomenon out of control of concrete mix water cement ratio, guarantee that structure outward appearance and concrete bulk strength all can meet the demands.Sensor (3) can be used for the concrete pouring quality that concrete such as fixed point monitoring prestress anchor head (9), prestress pipe (10) below, reinforcing bar (11) compact district are difficult to build the position by hard-wired mode.Sensor (3) is sent to the exit or the deep of prestress pipe (10), can monitors the eliminating situation of the inner ponding of mud jacking preceding pipeline (12); Also can be used for detecting whether spillage or scurry slurry of concreting or pipeline pneumatic mortar process pipeline, in order to avoid cause line clogging; Whether the eliminating situation and grout (5) solidification process that are used to detect pipeline inner air (14), ponding (12), thin pulp during mud jacking defectives such as bleeding, contraction occur.The technical operation of electric exploring method reinforced concrete and prestressed concrete construction quality monitoring is easy, quick, can in time pinpoint the problems, and in time changes construction technology, and for improving construction quality, it is significant to reduce constructional deficiency.
The present invention will be further described below in conjunction with embodiment.
Embodiment one: the quality monitoring of plug-in type concrete pouring construction
This structure is the 30mT beam as shown in Figure 1, because the deck-molding web is narrow, the honeycomb and scale phenomenon often appears in T beam water chestnut, web, the time have concrete springback intensity to be lower than the designing requirement phenomenon, the concrete pouring construction quality is difficult to ensure.
1. the demarcation of concrete strength prediction
Purpose: the concrete mix (4) with design mixture proportion preparation be a standard, demarcates because of bleeding, emanates, adds and its water cement ratio is changed after the water effect and the relation of electrical measurement value, concrete crushing strength respective change.
Scaling method: with the concrete mix (4) of design mixture proportion preparation concrete mix as standard, sensor (3) is inserted in the concrete mix (4), set and the fixing state of electrical resistivity survey instrument (1), the electrical measurement value Vr0 of the concrete mix of actual measurement standard, join in the concrete mix of standard respectively by the corresponding water yield that increases of Different Water-Cement Ratio grade again and suitably mix and stir, measure and write down corresponding electrical measurement value Vri respectively.Make the concrete sample of identical water cement ratio simultaneously, measure its corresponding concrete crushing strength R
0, Ri.As:
The calibration result of certain engineering concrete water-cement ratio and electrical measurement value
| Water cement ratio (W/C) | 0.50 | 0.567 | 0.633 | 0.70 | 0.90 | 0.967 | 1.167 |
| Electrical measurement value (Vri) | 20 | 18 | 16 | 14 | 10 | 8 | 5 |
| Concrete strength (Mpa) | 31.9 | 26.7 | 22.6 | 19.2 | 12.1 | 10.4 | 6.4 |
Analyze the correlationship of electrical measurement value and concrete mix water cement ratio, concrete crushing strength, the foundation of prediction concrete strength during as construction monitoring, and the feature alarm set point when determining detection.As setting:
The Vr value of correspondence was the intensity alarm set point when prediction concrete strength was 0.95R, was defined as Vra.
Can set the Vr value of predicting correspondence when concrete strength is 1.05R during strict demand and be alarm set point.
2. the demarcation of concrete disintegration degree detecting
Purpose: the concrete mix (4) with the design mixture proportion preparation is a standard, the situation of change when demarcating because of coarse aggregate and sand-cement slurry segregation.
Scaling method: the concrete mix of preparing with the match ratio of designing requirement (4) is the concrete mix of standard, tell coarse aggregate and the sand-cement slurry that the surface is stained with grout with mesh screen, unified instrument and equipment state with the concrete strength timing signal is a standard, sensor (3) is inserted in the concrete compound (4), the electrical measurement value Vr0 of actual measurement standard concrete mix, is stained with the electrical measurement value Vl of the coarse aggregate of grout
IV, sand-cement slurry electrical measurement value Vh
IV
The sand-cement slurry parts by weights is four parts, is added in the coarse aggregate that is stained with grout respectively and mixes all, survey respectively and read VlIII, Vl
II, Vl
IDifferentiation grade foundation as cavity, honeycomb degree:
Honeycomb I level 100% is stained with the Vr value of the coarse aggregate+75% sand-cement slurry correspondence of grout, is defined as Vl
I
Honeycomb II level 100% is stained with the Vr value of the coarse aggregate+50% sand-cement slurry correspondence of grout, is defined as Vl
II
Honeycomb III level 100% is stained with the Vr value of the coarse aggregate+25% sand-cement slurry correspondence of grout, is defined as Vl
III
Honeycomb IV level 100% is stained with the Vr value of the coarse aggregate+0% sand-cement slurry correspondence of grout, is defined as Vl
IV
The coarse aggregate parts by weights that is stained with grout is four parts, is added in the sand-cement slurry respectively and mixes all, survey respectively and read Vh
III, Vh
II, Vh
IDifferentiation grade foundation as the concrete disintegration degree:
Segregation I level 75% is stained with the Vr value of the coarse aggregate+100% sand-cement slurry correspondence of grout, is defined as Vh
I
Segregation II level 50% is stained with the Vr value of the coarse aggregate+100% sand-cement slurry correspondence of grout, is defined as Vh
II
Segregation III level 25% is stained with the Vr value of the coarse aggregate+100% sand-cement slurry correspondence of grout, is defined as Vh
III
Segregation IV level 0% is stained with the Vr value of the coarse aggregate+100% sand-cement slurry correspondence of grout, is defined as Vh
III
Should make the concrete sample of identical match ratio, measure its corresponding concrete crushing strength, and analyze its correlationship, so that when monitoring implements to monitor with the relative intensity index.
3. concrete pouring construction quality on-site supervision
Electrical resistivity survey instrument (1) is adjusted to the state that timing signal is set, or in confirming the concrete mix (4) that its quality is consistent with designing requirement, is adjusted to standard state.Sensor (3) is inserted into enforcement detection in the concrete mix (4), the electrical measurement value of concreting process changes can be divided into three phases from low to high, the foundation of the calibration result that adopts the calibration result of concrete strength prediction and concrete disintegration degree detecting during as construction monitoring.
A. owe the stage of shaking
Actual measurement electrical measurement value is lower than Vl
IThe time, be judged to the concrete density deficiency, may form defectives such as honeycomb, should strengthen vibrating.
B. jolt ramming stage
The electrical measurement value should equal or near Vr during concrete mix jolt ramming
0Value.If electrical measurement value stabilization and be higher than Vrb during jolt ramming, think the requirement of concrete strength off-design, should further search reason, in time get rid of.
C. spend the stage of shaking
The electrical measurement value of position and top of vibrating after the jolt ramming is increased to Vh gradually
IValue, and the electrical measurement value below the position of vibrating may be lower than Vl
IThe time be to shake, should stop to vibrate of this position, the concrete mix intensity of serious segregation is low, is easy to generate contraction fissure, should handle.
Embodiment two: the quality monitoring of flush type concrete pouring construction
As shown in Figure 2, because prestress anchor head (9), prestress pipe (10) below are not easy with the monitoring of plug-in type method, use the monitoring of flush type fixed point monitoring method instead, the most difficult jolt ramming place of surface concrete is respectively pasted a sensor (3) with double faced adhesive tape (8) under prestress anchor head (9), prestress pipe (10) outer wall respectively, and uses lead (2) to be connected on the passage of electrical resistivity survey instrument (1) respectively.
All the other are with embodiment one.
Embodiment three: prestress pipe mud jacking construction quality monitoring I
As shown in Figure 3, this structure is the 30mT beam, adopts post-tensioned construction, checks behind the mud jacking that discovery mud jacking hole and plasma discharge hole grout are not full, and a pore is respectively arranged at the top.Begin to speak to check in the web side, find that there is the cavity of the about 2cm of a chord length, rise 1cm the pipeline top, there are flowing out, illustrate that there is wretched insufficiency in pipeline pneumatic mortar technology.
The demarcation of squeezing quality monitoring
Prepare the grout of grout (5) by the match ratio of designing requirement as standard, set electrical resistivity survey instrument (1) state, sensor (3) is inserted in the grout (5), the electrical measurement value Ur0 of the grout of actual measurement standard, scaling method as the concrete strength detection, join in the grout of standard respectively by the corresponding water yield that increases of Different Water-Cement Ratio grade again and suitably mix all, measure and write down corresponding electrical measurement value Uri respectively.Make the grout test specimen of identical water cement ratio simultaneously, measure 28 days compressive strength Ru of its corresponding grout
0, Rui.Analyze the corresponding relation of electrical measurement value and grout water cement ratio, grout compressive strength, and confirm the intensity alarming value of Construction control.
Measure construction water simultaneously, have the health water of calcium ion, fully solidified water mud the electrical measurement value, and the electrical measurement value when sensor surface is stained with grout in the air, the foundation during as monitoring.
Sensor (3) is placed in bottom and the top of descending recess corresponding to prestress pipe (10) in the T girder span, the bottom measuring point is mainly used in the eliminating situation that detects ponding in the preceding pipe of mud jacking, the top measuring point is mainly used in the monitoring of the eliminating situation of inner air tube, ponding, thin pulp, and be used for the curdled appearance monitoring of grout, as analyzing the grout bleeding, shrinking and come to nothing etc.Another sensor (3) is placed in the grout outlet place of prestress pipe (10), the eliminating situation of exit air, ponding, thin pulp when being used to detect mud jacking; Mud jacking to the electrical measurement value of managing inner top measuring point and grout outlet place measuring point all more than or equal to the intensity alarming value of Construction control, oneself is full closely knit to confirm mud jacking, voltage stabilizing stops mud jacking after 1.5Mpa to 2 minute again.Follow the tracks of the situation of change of detector tube inner top measuring point afterwards, the electrical measurement value gradually reduces the state near the grout full solidification time, show that pipeline pneumatic mortar is up-to-standard, and process of setting does not have bleeding, shrinkage phenomenon.
All the other are with embodiment one.
Embodiment four: prestress pipe mud jacking construction quality monitoring II
As shown in Figure 4, it is a grand bridge case beam, the long 120m of this sections rope, adopt vacuum grouting technology, check behind the mud jacking that discovery part mud jacking hole and plasma discharge hole grout are not full, there is a pore in the top, and wherein rope two ends anchor head mud jacking mud jacking hole and plasma discharge hole still has water to ooze out two days later, shows that still there is wretched insufficiency in pipeline pneumatic mortar technology.
Two electrodes (13) are installed in advance on plastics prestress pipe (15) sections, two electrodes (13) apart from 30cm, on plastics prestress pipe (15) sections, simulate virtual condition, scaling method with embodiment three, demarcate the corresponding relation of electrical measurement value and grout water cement ratio, grout compressive strength, and measure influence when having steel strand wires to exist, confirm the intensity alarming value of Construction control.Demarcate construction water simultaneously, have the health water of calcium ion, fully solidified water mud the electrical measurement value, and the electrical measurement value when electrode surface is stained with grout in the air, the foundation during as monitoring.
On the medial surface of the characteristic portions such as top of the recessed section of plastics prestress pipe (15) of structure, two electrodes apart from 30cm (13) are installed, lead (2) passes through from concrete (16), is connected on the passage of electrical resistivity survey instrument (1) to implement to detect.
All the other are with embodiment one and embodiment three.
Claims (5)
1. the invention is characterized in that electrical resistivity survey instrument (1) is connected to the sensor of being made up of fixed electorde (13) (3) by lead (2), sensor (3) is sent in concrete mix (4) or the grout (5), measure the resistance or the resistivity of concrete mix (4) or grout (5), different its resistance of match ratio or the also different principle of resistivity according to concrete mix (4) or grout (5), detect the match ratio situation of change of concrete mix (4) or grout (5), analyze its match ratio, water cement ratio, intensity and pouring quality reach the purpose that reinforced concrete and prestressed concrete construction quality are detected and monitor.
2. according to claim 1, it is characterized in that sensor (3) is installed in an end of rod member (6), rod member (6) can be hollow-core construction, and lead (2) can pass through from the centre of rod member (6), with the pouring quality of inserted mode with the concrete mix (4) at place, machine testing template (7) deep.
3. according to claim 1, it is characterized in that sensor (3) is fixedly mounted on the inwall of template (7) by double faced adhesive tape (8) etc., below prestress anchor head (9) surface, prestress pipe (10) outer wall, the concrete such as compact district of reinforcing bar (11) position that is difficult to build, fixed point detects the pouring quality of concrete mix (4).
4. according to claim 1, it is characterized in that sensor (3) is sent to prestress pipe (10) inside, be used to detect the eliminating situation of prestress pipe (10) inner air (14), ponding (12) and the squeezing quality of grout (5).
5. according to claim 1, it is characterized in that electrode (13) is directly installed on the medial surface of plastics prestress pipe (15), lead (2) passes through from concrete (16), detect plastics prestress pipe (15) inner air (14), ponding (12) between two electrodes (13) eliminating situation, grout (5) squeezing quality and solidify situation.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102444289A (en) * | 2011-11-18 | 2012-05-09 | 河海大学 | Concrete pouring and vibrating dynamic visualization monitoring method |
| CN102505857A (en) * | 2011-11-18 | 2012-06-20 | 河海大学 | Method for positioning vibrating trace of vibrating needle in concrete based on GPS (Global Positioning System) |
| CN102507658A (en) * | 2011-11-18 | 2012-06-20 | 河海大学 | Method for measuring concrete vibrating time in real-time |
| CN105275005A (en) * | 2015-10-16 | 2016-01-27 | 浙江工业大学 | Method for detecting pile foundation post-grouting quality by using electrical method well logging system |
| CN106124569A (en) * | 2016-08-30 | 2016-11-16 | 北京智博联科技股份有限公司 | A kind of for measuring the reinforced bar sleeve grouting probe of plumpness and method |
| CN106198641A (en) * | 2016-08-30 | 2016-12-07 | 北京智博联科技股份有限公司 | The probe of resistivity of media in measurement prefabricated concrete structure reinforced bar sleeve |
| TWI600818B (en) * | 2015-07-01 | 2017-10-01 | 崑山科技大學 | Concrete pouring saturation detecting device and method applied to template construction engineering |
| CN108037158A (en) * | 2017-12-29 | 2018-05-15 | 中冶建筑研究总院有限公司 | A kind of method and apparatus being detected using metal detection line to grouting material plumpness |
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| CN108802110A (en) * | 2018-05-31 | 2018-11-13 | 宁波联城住工科技有限公司 | Detection device and its detection method for measuring grout sleeve Grouted density |
| CN110208329A (en) * | 2019-06-24 | 2019-09-06 | 徐豫青 | A kind of sleeve Grouted density detection method and device |
| CN111189744A (en) * | 2020-03-16 | 2020-05-22 | 广西交通科学研究院有限公司 | Device and method for detecting grouting compactness of duct |
| CN114046821A (en) * | 2021-11-10 | 2022-02-15 | 山东高速股份有限公司 | Prestressed beam grouting monitoring device and monitoring process |
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| CN102444289A (en) * | 2011-11-18 | 2012-05-09 | 河海大学 | Concrete pouring and vibrating dynamic visualization monitoring method |
| CN102505857A (en) * | 2011-11-18 | 2012-06-20 | 河海大学 | Method for positioning vibrating trace of vibrating needle in concrete based on GPS (Global Positioning System) |
| CN102507658A (en) * | 2011-11-18 | 2012-06-20 | 河海大学 | Method for measuring concrete vibrating time in real-time |
| CN102444289B (en) * | 2011-11-18 | 2013-09-25 | 河海大学 | Concrete pouring and vibrating dynamic visualization monitoring method |
| CN102507658B (en) * | 2011-11-18 | 2013-09-25 | 河海大学 | Method for measuring concrete vibrating time in real-time |
| CN102505857B (en) * | 2011-11-18 | 2014-02-19 | 河海大学 | Method for positioning vibrating trace of vibrating needle in concrete based on GPS (Global Positioning System) |
| TWI600818B (en) * | 2015-07-01 | 2017-10-01 | 崑山科技大學 | Concrete pouring saturation detecting device and method applied to template construction engineering |
| CN105275005A (en) * | 2015-10-16 | 2016-01-27 | 浙江工业大学 | Method for detecting pile foundation post-grouting quality by using electrical method well logging system |
| CN106198641A (en) * | 2016-08-30 | 2016-12-07 | 北京智博联科技股份有限公司 | The probe of resistivity of media in measurement prefabricated concrete structure reinforced bar sleeve |
| CN106124569A (en) * | 2016-08-30 | 2016-11-16 | 北京智博联科技股份有限公司 | A kind of for measuring the reinforced bar sleeve grouting probe of plumpness and method |
| CN108107193A (en) * | 2017-12-15 | 2018-06-01 | 哈尔滨工业大学 | A kind of test device and method of fresh concrete education resistance energy |
| CN108037158A (en) * | 2017-12-29 | 2018-05-15 | 中冶建筑研究总院有限公司 | A kind of method and apparatus being detected using metal detection line to grouting material plumpness |
| CN108802110A (en) * | 2018-05-31 | 2018-11-13 | 宁波联城住工科技有限公司 | Detection device and its detection method for measuring grout sleeve Grouted density |
| CN110208329A (en) * | 2019-06-24 | 2019-09-06 | 徐豫青 | A kind of sleeve Grouted density detection method and device |
| CN111189744A (en) * | 2020-03-16 | 2020-05-22 | 广西交通科学研究院有限公司 | Device and method for detecting grouting compactness of duct |
| CN114046821A (en) * | 2021-11-10 | 2022-02-15 | 山东高速股份有限公司 | Prestressed beam grouting monitoring device and monitoring process |
| CN114046821B (en) * | 2021-11-10 | 2023-06-02 | 山东高速股份有限公司 | Prestressed beam grouting monitoring device and monitoring technology |
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