CN111307875A - Resistivity method based sleeve grouting compactness detection device and method - Google Patents
Resistivity method based sleeve grouting compactness detection device and method Download PDFInfo
- Publication number
- CN111307875A CN111307875A CN202010130621.7A CN202010130621A CN111307875A CN 111307875 A CN111307875 A CN 111307875A CN 202010130621 A CN202010130621 A CN 202010130621A CN 111307875 A CN111307875 A CN 111307875A
- Authority
- CN
- China
- Prior art keywords
- sleeve
- grouting
- electrode probe
- metal sleeve
- grout
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
- G01N27/07—Construction of measuring vessels; Electrodes therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
- G01N27/08—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid which is flowing continuously
- G01N27/10—Investigation or analysis specially adapted for controlling or monitoring operations or for signalling
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/20—Investigating the presence of flaws
Abstract
The invention discloses a sleeve grouting compactness detection device and method based on a resistivity method, wherein an electrode probe is arranged in a grouting metal sleeve, and an externally-connected portable comprehensive tester excites current signals to be transmitted on a cable and the probe, so that when media around the electrode probe are changed, the resistance measured by the probe is also changed, and further, the resistance signals received by the portable comprehensive tester are also changed, displayed on a display and finally stored in a data storage device of the portable comprehensive tester; finally, remote transmission and uploading of detection data are carried out through a wireless network, and therefore the region with insufficient grouting inside the metal sleeve is effectively detected. Compared with other detection methods, the method has the advantages of high detection precision, convenience in implementation and certain use value.
Description
Technical Field
The invention belongs to the field of assembled structure detection, and particularly relates to a device and a method for detecting compactness of a grouting metal sleeve based on a resistivity method.
Background
Along with the rapid development of economy and urbanization in China, the building industrialization process is accelerated, and the traditional cast-in-place building technology cannot meet the development requirements of the building industry due to unreasonable resource allocation, low construction mechanization degree and poor construction work environment. The assembly type building is a standardized green building form which is developed in recent years, has high efficiency and rapidness in construction, saves energy, protects environment and ensures quality, and is valued by the building industry.
The earthquake resistance and integrity of the fabricated building are important influencing factors restricting the development of the fabricated building, and in order to improve the earthquake resistance and integrity of the fabricated building, reliable connection between fabricated building components needs to be ensured. The common assembly type building connection mode mainly comprises steel bar sleeve grouting connection, the integrity of the assembly type building is effectively guaranteed by the connection mode, the shock resistance of the assembly type building is correspondingly improved, and the assembly type building connection mode is widely applied to building structures such as a building assembly type shear wall, a bridge assembly type box girder and a bridge pier.
The steel bar sleeve is mainly composed of an assembly type building component connecting steel bar and a sleeve. Currently, the conventional method for detecting the grouting compactness degree in the grouting metal sleeve is to adopt methods such as unidirectional tension, high stress repeated tension and compression test, large deformation repeated tension and compression test and the like for a grouting metal sleeve connecting joint test piece; however, the defects of the sleeve grouting material are concealed, so that the concrete defect positions of the grouting sleeve cannot be well known by detecting the compaction degree of the sleeve grouting material by the conventional method, so that the constructor can be conveniently and pertinently reinforced. On the basis of a nondestructive detection method, the positions and the degrees of the defects of the compactness of the sleeve grouting material cannot be accurately judged by an ultrasonic method, an impact echo method, an infrared thermal imaging method and the like, and the detection precision is low; although the X-ray industrial CT method can clearly obtain the internal structure, compactness and defect distribution images of the grouting metal sleeve and realize the grouting compactness detection of the grouting metal sleeve, the method has the problems of overlarge and complicated test equipment and high manufacturing cost of a detection instrument, and the methods also have the problems of ray radiation, environmental pollution and the like, which are harmful to human bodies, so the X-ray industrial CT method cannot be industrially applied.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a device and a method for detecting the grouting compactness of a sleeve based on a resistivity method.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a sleeve grouting compactness detection device based on a resistivity method comprises a grouting metal sleeve, a pouring template, a portable intelligent tester and an electrode probe; the electrode probe is sequentially connected with the pouring template and the portable intelligent tester through a pressure-resistant anticorrosive waterproof cable, and the pouring template has a waterproof function; the portable intelligent tester can detect the resistance value of the grouting sleeve corresponding to the electrode probe in real time and record the resistance value; the electrode probe penetrates through the grouting metal sleeve from top to bottom until the bottom of the grouting metal sleeve; the electrode probe has the characteristics of no water adhesion and no dry and wet concrete adhesion.
Further, the grouting metal sleeve comprises a hollow metal sleeve, a rubber plug, a pre-embedded steel bar, a connecting steel bar and a rubber plug; the upper side and the lower side of the hollow metal sleeve are respectively provided with a grout outlet and a grout filling port; the embedded steel bars and the connecting steel bars are respectively embedded in the upper end and the lower end of the hollow metal sleeve; the rubber plug is plugged at the grout outlet; the rubber stopper is connected to the top of the hollow metal sleeve.
Further, the rubber buffer is equipped with the through-hole that supplies embedded bar and electrode probe to penetrate.
Furthermore, the embedded steel bars and the connecting steel bars are on the same straight line.
Furthermore, except the end part of the electrode probe, the surface of the electrode probe is coated with hydrophobic materials; the hydrophobic coating material has the characteristics of no water adhesion and no dry and wet concrete adhesion.
Further, the electrode probe adopts 200-400-mesh irregular quartz sand for sand blasting treatment.
Further, the electrode probe can be installed in 3 ways: inside the accessible top rubber buffer inserts metal sleeve, also accessible rubber stopper gets into inside the metal sleeve from the grout outlet, also can insert inside the metal sleeve with connecting reinforcement after parallelly connected.
Further, the hydrophobic material is a polysilazane modified material; the polysilazane modified material comprises 10 parts of polysilazane, 0.4 part of silane coupling agent, 0.2 part of silicon dioxide and 0.08 part of perfluoropolyether in parts by weight; and after the sand blasting process is finished, the polysilazane modified material is sintered on an electrode probe by using tetrafluoroethylene.
A sleeve grouting compactness detection method based on a resistivity method is characterized in that the device of claim 8 is used for detecting a grouting metal sleeve according to the following steps:
① inserting an electrode probe from top to bottom through a rubber plug at the top of the hollow metal sleeve until the bottom of the hollow metal sleeve, and then connecting the electrode probe with the pouring template and the portable intelligent tester in sequence through a cable;
② opening the portable intelligent tester, observing the resistance value of each electrode probe before grouting, and setting a threshold range;
③ grouting the metal sleeve, and recording the resistance change measured by the electrode probe during the rising of the slurry level in the sleeve;
④, if the resistance value measured by the electrode probe at a certain depth in the sleeve is reduced to a set threshold range, the position is full of grout, if the resistance value measured by the electrode probe is not reduced to the set threshold range after the grouting is finished, the position is not full of grout, and if the resistance value measured by the electrode probe is reduced to the set threshold range before the grouting is finished and then is restored to the resistance value before the grouting, the grout level at the position falls back and the grout is not full.
⑤ if there is the defect in the discovery grout sleeve plumpness, then paste the two-dimensional code on this grout sleeve surface, adopt portable intelligent tester's bar code scanner to scan this two-dimensional code simultaneously, the record lacks this grout sleeve serial number with the saving, reinforces the reinforcement for the later stage and provides positional information.
Furthermore, the electrode probe can be embedded in a plurality of positions in the sleeve according to the detection position requirement, so that the grouting fullness detection at different depths is realized.
The invention has the beneficial effects that: the invention forms a current loop with the electrode probe through the portable intelligent tester; when the medium around the probe changes, the measured resistance value also changes, and then the resistance value range is compared with the resistance value range of the grouting material set by the intelligent tester, the grouting fullness result of the sleeve is given in real time, and finally the detection data is stored in the portable intelligent tester. Compared with the prior art, the invention has the advantages of low detection cost, convenient carrying of equipment and extremely high detection precision.
Drawings
The invention is further described with reference to the following figures and examples.
FIG. 1 is a schematic diagram of the general structure of the present invention;
FIG. 2 is a schematic structural view of the rubber stopper of the present invention;
fig. 3 is a schematic structural view of the electrode probe penetrating through a rubber stopper.
Detailed Description
As shown in fig. 1-3, a sleeve grouting compactness detection device based on a resistivity method comprises a grouting metal sleeve 1, a pouring template 4, a portable intelligent tester 2 and an electrode probe 3; the electrode probe 3 is sequentially connected with the pouring template 4 and the portable intelligent tester 2 through a pressure-resistant anti-corrosion waterproof cable 5, and the pouring template 4 has a waterproof function. The grouting metal sleeve 1 is composed of a hollow metal sleeve 11, a rubber plug 12, cement slurry 13, embedded steel bars 14, connecting steel bars 15 and a rubber plug 16; the upper side and the lower side of the hollow metal sleeve 11 are respectively provided with a grout outlet 111 and a grout inlet 112, the rubber plug 12 is positioned at the top of the hollow metal sleeve 11 and is provided with a through hole 121 for the embedded steel bar 14 and the electrode probe 3 to penetrate; the electrode probe 3 is connected to the portable intelligent tester 2 through a cable 5; the electrode probe 3 passes through the through hole 121 of the rubber plug 12 until reaching the inner part of the cylinder body of the hollow metal sleeve 11; the upper end and the lower end in the hollow metal sleeve 11 are respectively embedded with a pre-embedded steel bar 14 and a connecting steel bar 15; after the electrode probe 3, the embedded steel bars 14 and the connecting steel bars 15 are installed in the hollow metal sleeve 11, the hollow metal sleeve 11 is filled with the cement slurry 13 entering from the grouting opening 112, the slurry outlet 111 is blocked by the rubber plug 16, and the cement slurry 13 is solidified in the hollow metal sleeve 11; the electrode probe 3 has the characteristics of no water adhesion and no dry and wet concrete adhesion.
The portable intelligent tester 2 consists of a resistance testing and analyzing device, a display, a built-in power supply, a data storage device and a two-dimensional code scanner; the grouting compactness detection information two-dimensional code generating and printing function of the sleeve is achieved, the resistance value measured by the electrode probe 3 is obtained through a built-in resistance testing and analyzing device and is displayed on a display of the device in real time, field test data can be stored in a data storage device of the device in real time and can also be transmitted to a computer and a mobile phone end through a wireless network, the two-dimensional code on the surface of a prefabricated component where the sleeve is located is scanned through a two-dimensional code scanner, code scanning information is recorded, and grouting detection data and component information can be linked.
In the present embodiment, the electrode wire surface of the electrode probe 3 except for the tip portion is coated with a hydrophobic material. The electrode probe 3 is firstly subjected to sand blasting treatment by using irregular quartz sand with 200-400 meshes to ensure that the end part is not subjected to sand blasting.
The hydrophobic material comprises the following components: the polysilazane modified material comprises 10 parts of polysilazane, 0.4 part of silane coupling agent, 0.2 part of silicon dioxide and 0.08 part of perfluoropolyether in parts by weight; the hydrophobic material composition can also be as follows: after the sand blasting process is finished, a special process is adopted, and tetrafluoroethylene is sintered on the electrode.
As shown in fig. 1 to 3, the sleeve grouting compactness detection device based on the resistivity method can detect the grouting metal sleeve according to the following steps:
① the electrode probe 3 is inserted into the hollow metal sleeve 11 through the rubber plug 12 on the top of the sleeve, the upper part of the electrode probe 3 is connected with the cable 5, and the cable 3 is connected with the end of the portable intelligent tester 2 to be led out of the component pouring template 4 when the fabricated concrete component is poured;
② before grouting the hollow metal sleeve 11, connecting the cable 3 with the portable intelligent tester 2, starting up and observing the resistance value of each electrode probe 3 before grouting;
③ grouting the metal sleeve 11, and deducing the grouting fullness in the sleeve 11 according to the resistance value change condition measured by the electrode probe 3 in the slurry liquid level rising process in the sleeve 11;
④, if the resistance value measured by the electrode probe 3 at a certain depth in the sleeve 11 is reduced to a set threshold range, the grout at the position is full, if the resistance value measured by the electrode probe 3 is not reduced to the set threshold range after the grouting is finished, the grout at the position is not full, and if the resistance value measured by the electrode probe 3 is reduced to the set threshold range before the grouting is finished, the grout level at the position falls back and the grout is not full.
⑤ when some assembled component detects and finds that sleeve 11 is full of grout and has the defect, adopt the scanner scanning prefabricated component surface of intelligent tester 2 from the area to paste the two-dimensional code, can record and save defect component number, reinforce the reinforcement for the later stage and provide positional information.
⑥ the electrode wire of the present invention can be embedded in the sleeve 11, or embedded from the grout outlet 111 when the sleeve 11 is grouted, or inserted into the metal sleeve 11 after being bonded with the connecting steel bar 14, depending on the type of the sleeve 11.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention.
Claims (10)
1. A sleeve grouting compactness detection device based on a resistivity method comprises a grouting metal sleeve, a pouring template, a portable intelligent tester and an electrode probe; the portable intelligent tester is characterized in that the electrode probe is sequentially connected with the pouring template and the portable intelligent tester through a pressure-resistant, corrosion-resistant and waterproof cable, and the pouring template has a waterproof function; the portable intelligent tester can detect the resistance value of the grouting sleeve corresponding to the electrode probe in real time and record the resistance value; the electrode probe penetrates through the grouting metal sleeve from top to bottom until the bottom of the grouting metal sleeve; the electrode probe has the characteristics of no water adhesion and no dry and wet concrete adhesion.
2. The device for detecting the grouting compactness of the sleeve based on the resistivity method according to claim 1, wherein the grouting metal sleeve comprises a hollow metal sleeve, a rubber plug, embedded steel bars, connecting steel bars and a rubber plug; the upper side and the lower side of the hollow metal sleeve are respectively provided with a grout outlet and a grout filling port; the embedded steel bars and the connecting steel bars are respectively embedded in the upper end and the lower end of the hollow metal sleeve; the rubber plug is plugged at the grout outlet; the rubber stopper is connected to the top of the hollow metal sleeve.
3. The device for detecting the grouting compactness of the sleeve based on the resistivity method according to claim 2, wherein the rubber plug is provided with a through hole for the embedded steel bar and the electrode probe to penetrate through.
4. The sleeve grouting compactness detection device based on the resistivity method according to claim 2, characterized in that: the embedded steel bars and the connecting steel bars are on the same straight line.
5. The device for detecting the grouting compactness of the sleeve based on the resistivity method according to any one of claims 1 to 4, is characterized in that: except the end head part, the surface of the electrode probe is coated with hydrophobic materials; the hydrophobic coating material has the characteristics of no water adhesion and no dry and wet concrete adhesion.
6. The sleeve grouting compactness detection device based on the resistivity method according to claim 5, characterized in that: the electrode probe is subjected to sand blasting treatment by using 200-400-mesh irregular quartz sand.
7. The sleeve grouting compactness detection device based on the resistivity method according to claim 5, characterized in that: the electrode probe is installed in 3 ways: inside the accessible top rubber buffer inserts metal sleeve, also accessible rubber end cap gets into inside the metal sleeve from the grout outlet, also can insert inside the metal sleeve with connecting reinforcement after parallelly connected.
8. The device for detecting the grouting compactness of the sleeve based on the resistivity method, according to the claim 5, is characterized in that the hydrophobic material is a polysilazane modified material; the polysilazane modified material comprises 10 parts of polysilazane, 0.4 part of silane coupling agent, 0.2 part of silicon dioxide and 0.08 part of perfluoropolyether in parts by weight; and after the sand blasting process is finished, the polysilazane modified material is sintered on an electrode probe by using tetrafluoroethylene.
9. A sleeve grouting compactness detection method based on a resistivity method is characterized in that the device of claim 8 is used for detecting a grouting metal sleeve according to the following steps:
① inserting an electrode probe from top to bottom through a rubber plug at the top of the hollow metal sleeve until the bottom of the hollow metal sleeve, and then connecting the electrode probe with the pouring template and the portable intelligent tester in sequence through a cable;
② opening the portable intelligent tester, observing the resistance value of each electrode probe before grouting, and setting a threshold range;
③ grouting the metal sleeve, and recording the resistance change measured by the electrode probe during the rising of the slurry level in the sleeve;
④, if the resistance value measured by the electrode probe at a certain depth in the sleeve is reduced to a set threshold range, the position is full of grout, if the resistance value measured by the electrode probe is not reduced to the set threshold range after the completion of the grout, the position is not full of grout, and if the resistance value measured by the electrode probe is reduced to the set threshold range before the completion of the grout, the level of the grout at the position falls back and the grout is not full.
⑤ if there is the defect in the discovery grout sleeve plumpness, then paste the two-dimensional code on this grout sleeve surface, adopt portable intelligent tester's bar code scanner to scan this two-dimensional code simultaneously, the record lacks this grout sleeve serial number with the saving, reinforces the reinforcement for the later stage and provides positional information.
10. The method for detecting the grouting compactness of the sleeve based on the resistivity method according to claim 9, wherein the method comprises the following steps: according to the requirement of the detection position, the electrode probe can be embedded at a plurality of positions in the sleeve so as to realize the detection of grouting plumpness at different depths.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010130621.7A CN111307875A (en) | 2020-02-28 | 2020-02-28 | Resistivity method based sleeve grouting compactness detection device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010130621.7A CN111307875A (en) | 2020-02-28 | 2020-02-28 | Resistivity method based sleeve grouting compactness detection device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111307875A true CN111307875A (en) | 2020-06-19 |
Family
ID=71151862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010130621.7A Pending CN111307875A (en) | 2020-02-28 | 2020-02-28 | Resistivity method based sleeve grouting compactness detection device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111307875A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111983201A (en) * | 2020-08-04 | 2020-11-24 | 上海建工集团股份有限公司 | Electromagnetic type sleeve grouting construction stage slurry filling plumpness detection device and method |
| CN113702504A (en) * | 2020-07-28 | 2021-11-26 | 广州建筑产业研究院有限公司 | Sleeve grouting fullness detection method and computer equipment |
| CN114113557A (en) * | 2021-12-07 | 2022-03-01 | 哈尔滨工业大学 | Self-monitoring method for grouting fullness of steel bar sleeve connection |
| CN116297713A (en) * | 2023-03-23 | 2023-06-23 | 广州市市政工程试验检测有限公司 | Method and device for detecting grouting fullness of prestressed duct |
-
2020
- 2020-02-28 CN CN202010130621.7A patent/CN111307875A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113702504A (en) * | 2020-07-28 | 2021-11-26 | 广州建筑产业研究院有限公司 | Sleeve grouting fullness detection method and computer equipment |
| CN113702504B (en) * | 2020-07-28 | 2023-06-20 | 广州建筑产业研究院有限公司 | Sleeve grouting fullness detection method and computer equipment |
| CN111983201A (en) * | 2020-08-04 | 2020-11-24 | 上海建工集团股份有限公司 | Electromagnetic type sleeve grouting construction stage slurry filling plumpness detection device and method |
| CN114113557A (en) * | 2021-12-07 | 2022-03-01 | 哈尔滨工业大学 | Self-monitoring method for grouting fullness of steel bar sleeve connection |
| CN114113557B (en) * | 2021-12-07 | 2022-07-29 | 哈尔滨工业大学 | Self-monitoring method for grouting fullness of steel bar sleeve connection |
| CN116297713A (en) * | 2023-03-23 | 2023-06-23 | 广州市市政工程试验检测有限公司 | Method and device for detecting grouting fullness of prestressed duct |
| CN116297713B (en) * | 2023-03-23 | 2024-01-23 | 广州市市政工程试验检测有限公司 | Method and device for detecting grouting fullness of prestressed duct |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111307875A (en) | Resistivity method based sleeve grouting compactness detection device and method | |
| CN110146593B (en) | Method for detecting compactness of grouting sleeves in batches | |
| CN108802187B (en) | Grouting fullness detection method and system based on sleeve surface ultrasound | |
| CN113624946B (en) | Grouting compactness detection device and method based on piezoelectric sensor | |
| CN211647352U (en) | Grout outlet pipe capable of assisting in evaluating grouting compactness of fabricated structure in construction process | |
| CN111456114B (en) | Method for detecting thickness of pile body steel bar protection layer | |
| CN202974148U (en) | Tool for detecting burial depth of chuck of chassis of power transmission pole | |
| CN212301393U (en) | Sleeve grouting compactness detection device based on resistivity method | |
| CN210465310U (en) | Grouting metal sleeve compactness detection device based on electromagnetic wave time domain reflection | |
| CN111912867B (en) | Grouting metal sleeve compactness detection device and method based on electromagnetic wave time domain reflection | |
| CN110455678A (en) | A kind of packaged type bridges pier stud node Grouted density detection method | |
| CN113624810B (en) | Sleeve grouting compactness detection device and method based on capacitance method | |
| CN111443131B (en) | Method for detecting grouting compactness of steel bar sleeve | |
| CN108918310A (en) | A method of detection prefabricated concrete structure middle sleeve grouting material solid strength | |
| CN203551275U (en) | Portable in-service electric pole concrete compressive strength field measuring instrument | |
| CN203879485U (en) | Perpendicularity detecting device of bored pile | |
| CN206671246U (en) | A kind of plug device for being used to examine reinforced bar sleeve Grouted density | |
| CN206618756U (en) | Test the easy device that cement paste shrinks overall process | |
| CN212514192U (en) | Device for detecting compactness of grouting sleeve based on nail shooting method | |
| CN212957267U (en) | Slurry storage and discharge device for vertical steel bar sleeve grouting connection | |
| CN116067969A (en) | Nondestructive testing and evaluating method for grouting reinforcement effect of earthen site cracks | |
| CN108301398A (en) | A kind of TRD diaphragm walls quality evaluating method | |
| CN220953578U (en) | Electronic elevation instrument for concrete pouring | |
| CN210288501U (en) | Device for detecting thickness of pile body steel bar protection layer | |
| CN209247692U (en) | A kind of detection device of steel pipe column high grade rock sand concrete |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |