CN112710536A - Cement soil compressive strength quality detection device and test method - Google Patents
Cement soil compressive strength quality detection device and test method Download PDFInfo
- Publication number
- CN112710536A CN112710536A CN202011462809.8A CN202011462809A CN112710536A CN 112710536 A CN112710536 A CN 112710536A CN 202011462809 A CN202011462809 A CN 202011462809A CN 112710536 A CN112710536 A CN 112710536A
- Authority
- CN
- China
- Prior art keywords
- compressive strength
- cement soil
- detecting
- quality
- cylinder
- 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
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
-
- 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
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a device and a method for detecting the compressive strength quality of cement soil, which relate to the technical field of the compressive strength quality detection of cement soil, and the device for detecting the compressive strength quality of cement soil comprises the following components: a cylinder; a platen mounted on the cylinder; the driving device is used for driving the pressing plate to move along the radial direction of the cylinder; the first detection device is arranged on the pressing plate and used for detecting the deformation of the hole wall of the drilled hole in the radial direction of the cylinder under the action of the pressing plate; and a second detecting device mounted on the driving device for detecting the pressure of the pressing plate in the radial direction of the cylinder. The device and the test method can be used for accurately detecting the compressive strength of the cement soil vertical reinforced composite foundation entity at different depths, evaluating the uniformity and integrity of the cement soil vertical reinforced composite foundation in the depth direction, accurately positioning the defect position, ensuring the quality of the cement soil vertical reinforced composite foundation and ensuring the engineering safety.
Description
Technical Field
The invention relates to the technical field of cement soil compressive strength quality detection, in particular to a cement soil compressive strength quality detection device and a cement soil compressive strength quality detection method.
Background
At present, the construction quality detection method of the cement-soil vertical reinforced composite foundation mainly comprises drilling and core pulling, and sampling for carrying out a compressive strength test. During the drilling and coring process of the cement soil vertical reinforced composite foundation, the part with poor quality is often cracked, damaged and deformed, and only the part with good quality can obtain a complete core sample suitable for a compressive strength test. It can be seen that the core sample test piece obtained by the traditional core drilling method and subjected to compressive strength is often the part with better quality, while the part with poorer quality affects the engineering quality. Therefore, the compressive strength test result obtained by the core drilling method is incomplete, has insufficient representativeness, is unsafe overall, is unfavorable for engineering safety, and has practical significance for researching and developing a more comprehensive detection method.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the above-mentioned problems in the prior art. Therefore, the embodiment of the invention provides a device for detecting the compressive strength quality of cement soil, which can accurately detect the compressive strength of a cement soil foundation.
The cement soil compressive strength quality detection device comprises a cylinder; a platen mounted on the cylinder; the driving device is used for driving the pressing plate to move along the radial direction of the cylinder; the first detection device is arranged on the pressing plate and used for detecting radial deformation of the hole wall of the drilled hole under the action of the pressing plate; and the second detection device is arranged on the driving device and used for detecting the radial pressure of the pressing plate.
According to the embodiment of the first aspect of the invention, the number of the pressing plates is 2-4, and the pressing plates are uniformly distributed on the same circumference of the cylinder. 2 ~ 4 clamp plates of evenly distributed on the circumference provide the counter-force each other, make the device keep the atress balanced, simple structure is exquisite.
According to an embodiment of the first aspect of the invention, the driving means comprises a piston connected to the pressure plate for driving the pressure plate to press against the borehole wall.
According to an embodiment of the first aspect of the invention, the stroke of the piston is 5-30 mm.
According to an embodiment of the first aspect of the present invention, the driving device further comprises an oil pump and an oil pipe, the oil pump being connected to the piston through the oil pipe.
According to an embodiment of the first aspect of the invention, the pressure plate has an arcuate surface, the arcuate surface being the face of the pressure plate that contacts the bore wall.
According to an embodiment of the first aspect of the present invention, the first detection means is a displacement gauge and the second detection means is a pressure gauge.
According to the embodiment of the first aspect of the invention, the device for detecting the compressive strength quality of the cement soil further comprises a depth measuring rope, wherein the depth measuring rope is connected with the cylinder, and the depth of the cylinder hoisted into the drill hole is automatically recorded by the depth measuring rope through a counter.
According to an embodiment of the first aspect of the present invention, the material of the cylinder is one of stainless steel and galvanized steel.
The invention also provides a cement soil compressive strength quality detection test method, which is carried out by adopting the device and comprises the following steps:
arranging a drill hole on the axis of the pile number to be detected;
cleaning loose attachments and sediments at the bottom of the hole of the drill hole;
hoisting a cement soil compressive strength quality detection device into a to-be-detected position in a drill hole along with an oil pipe and a sounding rope;
starting an oil pump to pressurize, pushing a pressure plate to the hole wall of the cement soil vertical reinforced composite foundation drill hole by a piston under the action of the oil pump, and collecting pressure of the pressure plate and deformation data of the hole wall;
changing the hanging depth of the device into the drill hole, repeating the previous step, and collecting the pressure of the pressure plates at different depths in the drill hole and the deformation data of the hole wall;
determining the compressive strength of the cement soil according to the pressure-deformation relation of a pressure plate with an experimental depth in the drilled hole of the cement soil vertical reinforced composite foundation;
and (5) obtaining a representative value of the compressive strength of the whole drill hole by integrating the compressive strengths of the drill holes at different depths.
Based on the technical scheme, the embodiment of the invention at least has the following beneficial effects: the compressive strength of different depths in the drill hole is determined by collecting the pressure and deformation data of different depths in the drill hole, the compressive strength of different depths of the cement soil vertical reinforced composite foundation entity is accurately detected, the uniformity and integrity of the cement soil vertical reinforced composite foundation in the depth direction are evaluated, the defect position is accurately positioned, the quality of the cement soil vertical reinforced composite foundation is ensured, and the engineering safety is ensured.
Drawings
The invention is further described below with reference to the accompanying drawings and examples;
FIG. 1 is a schematic structural diagram of a device for detecting compressive strength and quality of cement soil according to an embodiment of the present invention;
fig. 2 is a schematic top view of a cylinder according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
According to the traditional core drilling method, the effective compressive strength core sample test piece mainly comprises a part with good quality, and the part with poor quality is broken, so that the effective compressive strength core sample test piece is difficult to obtain, and the test result is inaccurate.
Referring to fig. 1, a first embodiment of the present invention provides a device 10 for detecting compressive strength and quality of cemented soil, where the device 10 for detecting compressive strength and quality of cemented soil includes: cylinder 11, platen 12, drive device 20, first detection device, and second detection device.
Wherein, the pressing plate 12 is arranged on the cylinder 11; the driving device 20 is used for driving the press plate 12 to move along the radial direction of the cylinder 11; the first detection device is arranged on the pressure plate 12 and used for detecting the deformation of the hole wall of the drill hole 2 in the radial direction of the cylinder 11; and second detecting means is mounted on the driving means for detecting the pressing force of the pressing plate 12 in the radial direction of the cylinder 11. Through the pressure of the different degree of depth in gathering drilling 2 and the data of deformation, confirm the compressive strength of the different degree of depth in drilling 2, the compressive strength of the different degree of depth of accurate detection cement soil foundation 1 entity to evaluation cement soil foundation 1 is at homogeneity, the integrality of depth direction, and the defective position is pinpointed, ensures cement soil vertical reinforcing composite foundation 1's quality, guarantees engineering safety. Meanwhile, the compression strength quality detection test period is short, and the construction period is not delayed. In addition, the quality detection cost of the cement soil foundation is also reduced.
It should be noted that the first detecting means is a displacement gauge 31 and the second detecting means is a pressure gauge. In order to obtain accurate hole wall deformation data, the measuring range of the displacement meter 31 is recommended to be 5-30 mm, and the minimum division value is not less than 0.01 mm; similarly, the range of the pressure gauge is recommended to be 0-50 MPa, and the minimum division value is not less than 0.1 MPa.
The number of the pressing plates 12 is 2-4, and the pressing plates 12 are evenly distributed on the same circumference of the cylinder 11. The pressing plates 12 which are uniformly distributed on the same circumference in the cylinder 11 detect the radial deformation of the pressing plates 12 on the hole wall of the drilled hole 2 of the cement soil vertical reinforced composite foundation 1 through the displacement meter 31 arranged in the pressing plates 12 in the cylinder and detect the radial pressure of the pressing plates 12 through the pressure gauge arranged in the oil pump in the cylinder, so that the radial deformation and the radial pressure data of the hole wall of the drilled hole 2 can be more accurately detected, and more accurate compressive strength representative values can be obtained.
In this embodiment, the driving device 20 includes a piston 22, the piston 22 is connected to the pressure plate 12, and the piston 22 is used for driving the pressure plate 12 to press the wall of the borehole, as shown in fig. 1. The platen 12 is moved in the radial direction of the cylinder 11 by the drive of the piston 22. Further, the driving device 20 includes an oil pump and an oil pipe, and the oil pump is connected to the piston 22 through the oil pipe. An oil pressure gauge 23 is arranged on the oil pipe, so that technicians can conveniently observe the oil pressure. It is to be noted that the cylinder 21 is provided on the axis of the cylinder 11, i.e., at a position where the plurality of pistons 22 intersect. When detecting the compressive strength of soil cement, start the oil pump, the oil pump passes through oil pipe drive piston 22 motion, and piston 22 drives clamp plate 12 and follows the motion of 11 radial directions of drum for 2 pore walls of clamp plate 12 extrusion drilling, the radial displacement data of pore wall are gathered to displacement meter 31, and simultaneously, the radial pressure data that clamp plate 12 received are gathered to the pressure gauge. In addition, in order to ensure the stability of the output oil pressure of the oil pump, the stroke of the piston 22 is recommended to be 5-30 mm, and the output oil pressure of the oil pump is recommended to be 0.1-70 MPa.
As a modification of the above embodiment, the pressure plate 12 has an arcuate surface, which is the surface of the pressure plate 12 that contacts the wall of the hole. The contact surface of the pressure plate and the hole wall is designed to be an arc surface, so that the pressure plate 12 is in full contact with the hole wall, the contact area is increased, a more accurate radial deformation value is obtained when the pressure plate 12 extrudes the hole wall, and the accuracy of the finally calculated compressive strength representative value is ensured. In the present embodiment, the area of the arc surface of the pressing plate 12 is preferably 50 to 200cm2. The area of the arc surface of the pressure plate 12 can be modified according to the actual situation, for example, the area can be adjusted to 100cm square and 150cm square according to the size of the aperture of the drill hole 22And the like.
As a further improvement of the above embodiment, the device 10 for detecting the compressive strength and quality of cement soil further comprises a depth measuring rope, wherein the depth measuring rope is connected with the cylinder 11, and the depth of the cylinder 11 suspended into the borehole 2 is automatically recorded by the depth measuring rope through a counter. When the embodiment of the invention is used for detecting the compression strength quality, the detection device is hung into the drill hole 2 of the cement-soil vertical reinforced composite foundation 1 by the depth measuring rope, and meanwhile, the depth of the cylinder 11 hung into the drill hole 2 is recorded by connecting the depth measuring rope with the counter.
The cylinder 11 is made of one of stainless steel and galvanized steel. The working environment of the embodiment of the invention belongs to a humid environment, and the material of the cylinder 11 is recommended to be stainless steel or galvanized steel in the embodiment of the invention, so that the cylinder 11 is prevented from rusting and corroding in use. In this embodiment, the diameter of the cylinder 11 is preferably 60 to 145mm, the length is preferably 100 to 1000mm, and the diameter of the cylinder 11 should be 5 to 30mm smaller than the diameter of the actual drilled hole 2. In practical application, the diameter of the adjusting cylinder 11 is 10mm, 20mm smaller than the diameter of the actual borehole 2 according to the diameter of the conventional borehole 2.
The embodiment of the second aspect of the invention provides a quality detection test method for the compressive strength of cement soil, which comprises the following steps:
arranging a drill hole 2 on the axis of the pile number to be detected;
cleaning loose attachments and sediments at the bottom of the hole of the drill hole 2;
detecting the quality of the drill hole 2;
hoisting a cement soil compressive strength quality detection device 10 into a to-be-detected position in the drill hole 2 along with an oil pipe and a sounding rope;
starting an oil pump to pressurize, pushing the pressure plate 12 to the wall of the cement foundation drilling hole by the piston 22 under the action of the oil pump, and collecting pressure of the pressure plate 12 and deformation data of the wall of the hole;
changing the hanging depth of the device into the drill hole, repeating the previous step, and collecting the pressure of the pressure plates at different depths in the drill hole 2 and the deformation data of the hole wall;
determining the compressive strength of the cement soil according to the pressure-deformation relation of the pressure plate 12 of the experimental depth in the cement soil foundation drill hole measured actually;
and (5) obtaining a representative value of the compressive strength of the whole drill hole by integrating the compressive strengths of the drill holes at different depths.
Wherein the vertical drilling 2 adopts a geological drilling machine to perform hole forming, the diameter of the drilling 2 is 71-150 mm, the water inflow of a drill bit is 0-5L/min, the footage speed is 1-100 mm/min, and the inclination of the drilling 2 is not more than 0.5%; the underwater low-voltage light source can work normally in a humid environment, the underwater low-voltage light source is placed in the drill hole 2, and the drilling quality of the drill hole 2 is checked.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. The utility model provides a soil cement compressive strength quality detection device which characterized in that includes:
a cylinder;
a platen mounted on the cylinder;
the driving device is used for driving the pressing plate to move along the radial direction of the cylinder;
the first detection device is arranged on the pressing plate and used for detecting radial deformation of the hole wall of the drilled hole under the action of the pressing plate; and
and the second detection device is arranged on the driving device and used for detecting the radial pressure of the pressing plate.
2. The device for detecting the compressive strength and quality of cement soil according to claim 1, wherein: 2-4 press plates are provided, and the press plates are uniformly distributed on the same circumference of the cylinder.
3. The device for detecting the compressive strength and quality of cement soil according to claim 1, wherein: the driving device comprises a piston, the piston is connected with the pressing plate, and the piston is used for driving the pressing plate to extrude the hole wall of the drilled hole.
4. The device for detecting the compressive strength and quality of cement soil according to claim 3, wherein: the stroke of the piston is 5-30 mm.
5. The device for detecting the compressive strength and quality of cement soil according to claim 3, wherein: the driving device further comprises an oil pump and an oil pipe, and the oil pump is connected with the piston through the oil pipe.
6. The apparatus for testing the compressive strength and quality of cement soil according to any one of claims 1 to 3, wherein: the pressing plate is provided with an arc surface, and the arc surface is a surface of the pressing plate contacted with the hole wall.
7. The device for detecting the compressive strength and quality of cement soil according to claim 1, wherein: the first detection device is a displacement meter, and the second detection device is a pressure meter.
8. The device for detecting the compressive strength and quality of cement soil according to claim 1, wherein: the device for detecting the compression strength quality of the cement soil further comprises a depth measuring rope, wherein the depth measuring rope is connected with the cylinder, and the depth of the cylinder hung into the drilled hole is automatically recorded through a counter by the depth measuring rope.
9. The device for detecting the compressive strength and quality of cement soil according to claim 1, wherein: the cylinder is made of one of stainless steel and galvanized steel.
10. A cement compressive strength quality detection test method, characterized by being carried out by using the cement compressive strength quality detection device of any one of claims 1 to 9, the method comprising the steps of:
arranging a drill hole on the axis of the pile number to be detected;
cleaning loose attachments and sediments at the bottom of the hole of the drill hole;
hoisting a cement soil compressive strength quality detection device into a to-be-detected position in a drill hole along with an oil pipe and a sounding rope;
starting an oil pump to pressurize, pushing a pressure plate to the hole wall of the cement soil vertical reinforced composite foundation drill hole by a piston under the action of the oil pump, and collecting pressure of the pressure plate and deformation data of the hole wall;
changing the hoisting depth of the cement soil compressive strength quality detection device into the drill hole, repeating the previous step, and collecting the pressure of the pressing plate and the deformation data of the hole wall;
changing the hanging depth of the device into the drill hole, repeating the previous step, and collecting pressure of the pressure plate at different depths in the drill hole and deformation data of the hole wall;
determining the compressive strength of the cement soil according to the pressure-deformation relation of a pressure plate with an experimental depth in the drilled hole of the cement soil vertical reinforced composite foundation;
and (5) obtaining a representative value of the compressive strength of the whole drill hole by integrating the compressive strengths of the drill holes at different depths.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011462809.8A CN112710536A (en) | 2020-12-14 | 2020-12-14 | Cement soil compressive strength quality detection device and test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011462809.8A CN112710536A (en) | 2020-12-14 | 2020-12-14 | Cement soil compressive strength quality detection device and test method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112710536A true CN112710536A (en) | 2021-04-27 |
Family
ID=75541819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011462809.8A Pending CN112710536A (en) | 2020-12-14 | 2020-12-14 | Cement soil compressive strength quality detection device and test method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112710536A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117804943A (en) * | 2024-02-29 | 2024-04-02 | 湖南百舸水利建设股份有限公司 | Cement soil penetration test method and detection device thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201503375U (en) * | 2009-09-22 | 2010-06-09 | 袁兆华 | Radial loading and testing investment of drilling jack |
| CN104215515A (en) * | 2014-09-17 | 2014-12-17 | 中国地质大学（武汉） | Self-counterforce type deep hole batholith load test device and test method thereof |
| CN204154579U (en) * | 2014-07-29 | 2015-02-11 | 中铁第一勘察设计院集团有限公司 | The proving installation of soil body compression deformation modulus and intensity in a kind of deep hole |
| KR20160001975A (en) * | 2014-06-30 | 2016-01-07 | 현대제철 주식회사 | Strength test method of specimen |
-
2020
- 2020-12-14 CN CN202011462809.8A patent/CN112710536A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201503375U (en) * | 2009-09-22 | 2010-06-09 | 袁兆华 | Radial loading and testing investment of drilling jack |
| KR20160001975A (en) * | 2014-06-30 | 2016-01-07 | 현대제철 주식회사 | Strength test method of specimen |
| CN204154579U (en) * | 2014-07-29 | 2015-02-11 | 中铁第一勘察设计院集团有限公司 | The proving installation of soil body compression deformation modulus and intensity in a kind of deep hole |
| CN104215515A (en) * | 2014-09-17 | 2014-12-17 | 中国地质大学（武汉） | Self-counterforce type deep hole batholith load test device and test method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117804943A (en) * | 2024-02-29 | 2024-04-02 | 湖南百舸水利建设股份有限公司 | Cement soil penetration test method and detection device thereof |
| CN117804943B (en) * | 2024-02-29 | 2024-05-10 | 湖南百舸水利建设股份有限公司 | Cement soil penetration test method and detection device thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5978749A (en) | Pile installation recording system | |
| CN108277926B (en) | Slurry anchor connection part grouting plumpness detection method with detection hole | |
| CN107288162B (en) | Device and method for detecting pile bottom sediment thickness of bored concrete pile | |
| CN114135278B (en) | Intelligent identification and prediction system and method for perception-while-drilling bad geology | |
| CN104535421B (en) | Detecting instrument and method for performance of cross-linked polymer gel | |
| White et al. | Comparing cross-hole sonic logging and low-strain integrity testing results | |
| CN112710536A (en) | Cement soil compressive strength quality detection device and test method | |
| CN110725347A (en) | Real-time detection method and system for broken pile in concrete cast-in-place pile construction process | |
| CN111537439B (en) | System and method for automatically identifying and evaluating defects of pressure-bearing equipment | |
| CN106839960A (en) | It is a kind of for timber structure Tenon node size and the lossless detection method of internal flaw | |
| CN111103168A (en) | Layered sampling equipment for soil detection | |
| CN107449827A (en) | A kind of rock-fill concrete structural level quality determining method and rock-fill concrete structural level quality evaluating method | |
| CN112730074A (en) | Plastic concrete compressive strength quality detection device and test method | |
| CN211904685U (en) | Layered sampling equipment for soil detection | |
| CN207079640U (en) | A kind of cast-in-place concrete pile pile bottom sediment thickness detection apparatus | |
| CN210322636U (en) | High-precision drilling shearing testing device | |
| CN111560996A (en) | Defect detection and repair method for cast-in-place pile in constructional engineering | |
| CN108917620B (en) | Micro-damage detection device for thickness of highway engineering concrete member | |
| CN115112485B (en) | Soil strength, deformation characteristic and seepage characteristic integrated detection device | |
| CN220084430U (en) | Powder taking device for testing chloride ion content of reinforced concrete | |
| CN206671075U (en) | A kind of concrete sample damages Crack Detection experimental rig | |
| CN111650246A (en) | Defect detection method for building foundation cast-in-place pile | |
| CN111487175A (en) | Current stabilizing structure for probe measuring device in permeability coefficient in-situ measuring system | |
| CN214668335U (en) | Be used for building concrete engineering quality detection device | |
| CN215116282U (en) | Grouting sleeve detector |
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 |