CN111948076A - Method for testing surface hardness of grouting material in sleeve grouting hole and grout outlet hole - Google Patents
Method for testing surface hardness of grouting material in sleeve grouting hole and grout outlet hole Download PDFInfo
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses a method for testing the surface hardness of grouting material in a sleeve grouting hole and a grout outlet hole, which adopts a DL-type Leeb hardness tester and a measuring point positioning module sleeved on an impact tube of the DL-type Leeb hardness tester to perform a matched test, wherein the measuring point positioning module comprises a supporting ring and an adjusting block, the supporting ring is used for positioning a measuring point, through holes for sleeving are formed in the supporting ring and the adjusting block, and an endoscopic observation mirror for observing the inside of the pore passage is also arranged on the adjusting block; the test method comprises the following steps: s1: determining the diameter of the detection surface according to the size of the plugging plug; s2: judging the maximum measuring point number of the detection surface according to the specified edge distance value and the specified distance value of the measuring points; s3: selecting a prefabricated part to be detected, and determining the number of actual measuring points on a detection surface; s4: performing surface hardness test under the cooperation of the measuring point positioning module; s5: and obtaining a detection result according to the test data of the plurality of test points. The invention has the advantages of convenient operation, easy control of the distance and the margin of the measuring points and high accuracy of the measured data.
Description
Technical Field
The invention relates to the technical field of assembly type buildings, in particular to a method for testing the surface hardness of grouting materials in a sleeve grouting hole and a grout outlet hole.
Background
Prefabricated structures are currently of great interest and use worldwide. Compared with the traditional concrete structure, the fabricated structure has the advantages of low construction cost, high construction speed, short construction period, high engineering quality, environmental friendliness, low energy consumption and the like. The sleeve grouting connection is a main mode of steel bar connection in the current assembly type, and the connection quality directly influences the safety performance and the service performance of the whole structure. As a key technology of an assembly type concrete structure, the sleeve grouting connection is mainly used for connecting steel bars of vertical members at important positions in the structure, the connection principle shows that the quality of grouting materials is an important factor influencing the whole connection, and the quality of the grouting materials is judged mainly through the strength of the grouting materials. The solid strength of the grouting material is a key factor for ensuring the grouting connection performance of the steel bar sleeve. In actual engineering, the strength of the grouting material is influenced by complex field construction environment and age, even the situation that the actual strength cannot meet the design requirement due to the fact that design water consumption is artificially increased to increase the mobility and poor-quality grouting material is used exists, and serious potential safety hazards are buried in the whole building structure. Therefore, it is necessary and important to accurately and reliably detect the strength of the sleeve grouting material.
The Jiangsu labour engineering construction standard DB 32/T3754-2020 Integrated concrete Structure testing technical Specification proposes that the solid strength of the grouting material is tested by a surface hardness method. The method is a method for estimating the compressive strength of the grouting material by testing the hardness value of the outer end face of the grouting material in the grouting channel or the grout outlet channel and according to the correlation between the surface hardness and the compressive strength. The standards further specify the appearance quality requirements and the measuring point distribution of the detection equipment and the detection surface. The detection equipment adopts a DL-type Leeb hardness tester. The appearance quality of the detection surface should be full of slurry, the surface is smooth and flat, and the number of air holes is small. The measuring points are uniformly distributed in the detection surface, the same measuring point can be tested for only 1 time, and the distance between any two measuring points and the distance between any measuring point and the edge of the detection surface are not smaller than 3 mm; 3-6 surface hardness values are collected by each sleeve, 16 points are tested by each prefabricated part, and 16 surface hardness values are counted.
However, in the actual detection process, it is found that when the existing DL-type richter hardness tester is used for testing the hardness of the grouting material surface in the sleeve grouting hole and the grout outlet hole, the following difficulties and disadvantages exist: (1) because the sleeve is arranged at the bottom of the prefabricated part and is short in length, even if a detector squats down, the grouting pipe and the grout outlet pipe of the sleeve are still positioned below the horizontal visual height of the detector, so that the condition inside a pore channel is difficult to directly observe, and the efficiency of inspecting the appearance quality of the detection surface is reduced; (2) when multi-point springback is carried out on a single detection surface, the detection surface cannot be observed in real time, and a conventional size measuring tool is difficult to enter a pore passage to measure the distance between the measurement points, so that the distance between the measurement points and the edge of the detection surface cannot meet the requirements of relevant standards; (3) in the existing DL-type Leeb hardness tester, a supporting ring is designed not to be abutted against a detection surface, but is abutted against two sides of a notch parallel to the detection surface above the detection surface to guide an impact tube to vertically abut against the detection surface; however, the grouting end faces in the grouting hole and the grout outlet hole are often not completely parallel to the wall surface, the wall surface flatness at the opening of the hole channel is difficult to ensure, and the existing supporting ring cannot extend into the hole channel to abut against the detection surface due to large size, so that the impact tube is perpendicularly abutted against the detection surface only by the experience of detection personnel in a state without fixed guide; the impact tube is a thin steel tube with the outer diameter of 4.5 mm and the wall thickness of 0.75 mm, and is difficult to ensure to be vertical to a detection surface only by the self-abutting, so that the accuracy and reliability of test data cannot be ensured.
Therefore, for standardizing the application of a surface hardness method to detect the entity strength of the sleeve grouting material, the detection precision is ensured, the detection efficiency is improved, besides the structural and functional improvement and promotion of a DL-type Leeb hardness tester, a testing method for the surface hardness of the grouting material in the sleeve grouting hole and the grout outlet hole is further developed.
Disclosure of Invention
The invention aims to provide a method for testing the surface hardness of grouting material in a sleeve grouting hole and a grout outlet hole, which effectively ensures the detection precision and improves the detection efficiency, and the distance between the measuring points and the edge distance are easy to control during detection.
In order to solve the technical problem, the invention provides a method for testing the surface hardness of grouting materials in a sleeve grouting hole and a grout outlet hole, which adopts a DL-type Leeb hardness tester and a measuring point positioning module sleeved on an impact pipe of the DL-type Leeb hardness tester to perform a matched test, wherein the measuring point positioning module comprises a supporting ring and an adjusting block, the supporting ring is used for positioning a measuring point, one end of the supporting ring is used for abutting against a detection surface, the other end of the supporting ring is connected with the adjusting block, and the supporting ring and the adjusting block are provided with through holes for sleeving; the adjusting block is provided with an endoscopic observation mirror for observing the inside of a grouting channel and/or a grout outlet channel of the sleeve; the axial length of the supporting ring is greater than the distance from the detection surface to the surface of the prefabricated part, the radial maximum dimension of the supporting ring is less than or equal to the diameter of the detection surface, the maximum thickness from the inner wall of the impact pipe positioned in the radial direction of the impact pipe to the outer wall of the supporting ring is greater than or equal to the larger value of the specified edge distance value and the specified distance value of the measuring points, and the minimum thickness from the inner wall of the impact pipe positioned in the radial direction of the impact pipe to the outer wall of the supporting ring is greater than or equal to the smaller value;
the test method comprises the following steps:
s1: determining the diameter of the detection surface; surveying the plugging size of a grouting opening and a grout outlet on the surface of a plugging prefabricated part in a construction site, and determining the actual diameter of a grouting hole channel and the actual diameter of a detection surface in the grout outlet hole channel of the sleeve according to the diameter of the end surface of the plugging input end;
s2: calculating the maximum measuring point number of the detection surface; calculating the maximum measuring point number which can be bounced by the detection surfaces in the grouting channel and the grout outlet channel respectively according to the actual diameter of the detection surface, the edge distance specified value and the distance specified value of the measuring points;
s3: determining the number of actual measuring points of the detection surface; selecting prefabricated components, and determining the distribution condition of a plurality of measuring points to be detected in a single prefabricated component on a detection surface meeting the requirement according to the maximum measuring point number of the detection surface, the number of sleeves contained in a single prefabricated component, the fullness of grouting materials in a grouting channel and a grout outlet channel of the sleeves and the apparent quality of the detection surface; if the actual measuring point number of a single detection surface is larger than the maximum measuring point number after distribution, the prefabricated part is reselected;
the actual measuring point number of the distributed single detection surface is less than or equal to the maximum measuring point number, and then the next step can be carried out on the prefabricated part;
s4: testing the surface hardness; testing according to the actual measuring point quantity and a corresponding operation method;
when the number of actual measuring points of the detection surface is 1, extending the measuring point positioning module into a corresponding grouting channel or a slurry outlet channel and abutting against the detection surface, taking the impact pipe as an axis, rotating the supporting ring for a circle, if the supporting ring exceeds the edge of the detection surface, indicating that the edge distance does not meet the requirement, adjusting the position until the supporting ring rotates for a circle, enabling the supporting ring to be tangent to the edge of the detection surface or to be positioned on the inner side, and performing impact test at the position;
when the number of actual measuring points of the detection surface is 2, the measuring point positioning module extends into a corresponding grouting channel or a grout outlet channel and abuts against the detection surface, the supporting ring abuts against the edge of the detection surface at a halving position to perform bounce test, when the supporting ring is bounced, an endoscopic observation mirror is used for observing whether the supporting ring is tangent to the edge of the detection surface and observing whether the supporting ring covers the bounced measuring points, the first measuring point can meet the requirement that the supporting ring is tangent to the edge of the detection surface to perform bounce test, and the second measuring point can meet the requirement that the supporting ring is tangent to the edge of the detection surface and the supporting ring does not cover the bounced measuring points to perform bounce test;
when the number of actual measuring points of the detection surface is 3, the measuring point positioning module extends into a corresponding grouting channel or a grout outlet channel and abuts against the detection surface, the supporting ring abuts against the trisection position of the edge of the detection surface to perform bounce test, when the supporting ring is bounced, an endoscopic observation mirror is used for observing whether the supporting ring is tangent to the edge of the detection surface or not and observing whether the supporting ring covers the bounced measuring points or not, the first measuring point meets the condition that the supporting ring is tangent to the edge of the detection surface to perform bounce test, and the second measuring point and the third measuring point need to meet the condition that the supporting ring is tangent to the edge of the detection surface and the supporting ring does not cover the bounced measuring points to perform bounce;
when the number of actual measuring points of the detection surface is 4, the measuring point positioning module extends into a corresponding grouting channel or a grout outlet channel and abuts against the detection surface, the supporting ring abuts against the edge of the detection surface at a quartering position to perform bounce test, when the supporting ring is bounced, an endoscopic observation mirror is used for observing whether the supporting ring is tangent to the edge of the detection surface and observing whether the supporting ring covers the bounced measuring points, the first measuring point can meet the condition that the supporting ring is tangent to the edge of the detection surface to perform bounce test, and the second measuring point, the third measuring point and the fourth measuring point can meet the condition that the supporting ring is tangent to the edge of the detection surface and the supporting ring does not cover the bounced measuring points to perform bounce test;
s5: and obtaining a detection result according to the test data of the plurality of test points.
Further, in S2, the maximum number of measuring points of the detection surface is determined according to the following formula;
when D +2b is more than or equal to D and less than 2D +2b + c, the maximum measuring point number of the detection surface is 1;
when it is satisfied with
Then, the maximum measuring point number of the detection surface is 2;
when it is satisfied with
Then, the maximum measuring point number of the detection surface is 3;
when it is satisfied with
Then, the maximum measuring point number of the detection surface is 4;
d is the actual diameter of the detection surface, D is the diameter of the measuring point, b is the specified value of the side distance of the measuring point, c is the specified value of the distance between the measuring points, and the maximum number of the measuring points of the detection surface is determined by comparing the diameter of the detection surface with the parameters on the left side and the right side in the four formulas.
Furthermore, the wall thickness of the supporting ring is uniform, the specified edge distance value of the measuring points is equal to the specified distance value, and the wall thickness of the supporting ring is used for controlling the distance from the measuring points to the edge of the detection surface to which the measuring points belong and the distance between the measuring points.
Furthermore, the outer wall surface of the supporting ring is of a reducing structure;
when the specified edge distance of the measuring points is greater than the specified distance value, the reducing convex surface of the supporting ring is used for controlling the distance from the measuring points to the edge of the detection surface to which the measuring points belong, the reducing concave surface of the supporting ring is used for controlling the distance between the measuring points and the measuring points, the distance from the inner wall of the shock tube positioned in the radial direction of the shock tube to the reducing convex surface of the supporting ring is greater than or equal to the specified edge distance value of the measuring points, and the distance from the inner wall of the shock tube positioned in the radial direction of the shock tube to the;
when the specified edge distance of the measuring points is smaller than the specified distance value, the reducing concave surface of the supporting ring is used for controlling the distance from the measuring points to the edge of the detection surface to which the measuring points belong, the reducing convex surface of the supporting ring is used for controlling the distance between the measuring points and the measuring points, the distance from the inner wall of the shock tube positioned in the shock tube radial direction to the reducing concave surface of the supporting ring is larger than or equal to the specified edge distance value of the measuring points, and the distance from the inner wall of the shock tube positioned in the shock tube radial direction to the reducing convex surface of.
Further, in S3, the number of the measuring points collected by each sleeve is 3 to 6, and when the requirement of the number of the measuring points is not met, the corresponding sleeve is directly removed.
Further, when the number of actual measuring points on the detection surface is 2, the measuring point positioning module is sleeved on an impact tube of a DL-type Leeb hardness tester, the adjusting block is held by hands, the supporting ring extends into a corresponding grouting channel or a corresponding grout outlet channel, the end face abuts against the detection surface, then the adjusting block is moved to drive the supporting ring to move and assist in observation through an endoscopic observation mirror, the position of the supporting ring for controlling the distance is tangent to the edge of the detection surface, the tangent position is selected in the 12 o 'clock direction, after the position is determined, the DL-type Leeb hardness tester is operated to flick, and after the flick operation is continuously performed in the 6 o' clock direction; when the supporting ring is flicked in the direction of 6 o' clock, whether the outer edge of the supporting ring covers the flicked measuring point needs to be observed through an endoscopic observation mirror, and if the flicked measuring point is covered, the adjusting block is finely adjusted, so that the supporting ring moves and the measuring point is exposed.
Further, when the number of actual measuring points on the detection surface is 3, the measuring point positioning module is sleeved on an impact tube of a DL-type Leeb hardness tester, the adjusting block is held by hands, the supporting ring extends into a corresponding grouting channel or a corresponding grout outlet channel, the end face abuts against the detection surface, then the adjusting block is moved to drive the supporting ring to move and assist in observation through an endoscopic observation mirror, the position of the supporting ring for controlling the distance is tangent to the edge of the detection surface, the tangent position is selected in the 12 o ' clock direction, after the position is determined, the DL-type Leeb hardness tester is operated to flick, and after the flick operation is continuously performed by selecting the 4 o ' clock direction and the 8 o ' clock direction; when the supporting ring is shot in the 4 o 'clock direction and the 8 o' clock direction, whether the outer edge of the supporting ring covers the shot measuring points needs to be observed through an endoscopic observation mirror, and if the outer edge of the supporting ring covers the shot measuring points, the adjusting block is finely adjusted, so that the supporting ring moves and the measuring points are exposed.
Further, when the number of actual measuring points on the detection surface is 4, the measuring point positioning module is sleeved on an impact tube of a DL-type Leeb hardness tester, the adjusting block is held by hands, the supporting ring extends into a corresponding grouting channel or a corresponding grout outlet channel, the end face abuts against the detection surface, then the adjusting block is moved to drive the supporting ring to move and assist in observation through an endoscopic observation mirror, the position of the supporting ring for controlling the distance is tangent to the edge of the detection surface, the tangent position is selected in the 12 o 'clock direction, after the position is determined, the DL-type Leeb hardness tester is operated to flick, and after the flick operation is continuously performed by selecting the 3 o' clock direction, the 6 o 'clock direction and the 9 o' clock direction; when the supporting ring is bounced in the 3 o ' clock direction, the 6 o ' clock direction and the 9 o ' clock direction, whether the outer edge of the supporting ring covers the bounced measuring point or not needs to be observed through an endoscopic observation mirror, and if the outer edge of the supporting ring covers the bounced measuring point, the adjusting block is finely adjusted, so that the supporting ring moves and the measuring point is exposed.
Further, the endoscope observation mirror is obliquely arranged and faces an end portion of the support ring on the side of the detection surface.
The invention has the beneficial effects that:
1. the interior of the sleeve grouting channel and the interior of the grout outlet channel are indirectly visually observed by utilizing the endoscopic observation mirror arranged on the detection equipment, so that the labor intensity of detection personnel is reduced, and the appearance quality of a detection surface can be quickly checked.
2. According to the end face diameters of the special blocking blocks of the grouting port and the grout outlet, the measuring points can be planned, the prefabricated parts can be selected preliminarily according to the planning, and then the number of qualified detection surfaces in the operation process cannot meet the requirement of all measuring point impact detection through on-site checking and further judgment of the prefabricated parts, so that unnecessary work repetition is avoided, and the detection efficiency is improved.
3. The radial maximum dimension of the supporting ring is smaller than or equal to the diameter of the detection surface, the supporting ring can be ensured to extend into a grouting channel and a grout outlet channel and be directly abutted against the detection surface, and the supporting ring guides the impact pipe to be vertically abutted against the detection surface, so that the vertical impact of the impact body on the detection surface is ensured, and the accuracy of surface hardness value test is improved.
4. When the detection surface is flicked, the interaction between the endoscopic observation mirror and the supporting ring is skillfully utilized to observe whether the supporting ring is tangent to the edge of the detection surface or not and whether the supporting ring covers the flicked measuring point or not, so that the distance and the edge distance of the measuring point are conveniently and accurately controlled.
Drawings
FIG. 1 is a test flow diagram of the present invention;
FIG. 2 is a schematic illustration of the invention as tested;
FIG. 3 is a schematic view of a DL-type Leeb hardness tester of the invention in cooperation with a test point positioning module;
FIG. 4 is a schematic diagram of the operational testing of a station of the present invention;
FIG. 5 is a schematic view of the arrangement of two stations of the present invention;
FIG. 6 is a schematic diagram of the arrangement of three stations of the present invention;
FIG. 7 is a schematic diagram of the arrangement of four stations of the present invention;
FIG. 8 is a schematic diagram of the operational testing of a plurality of stations of the present invention;
FIG. 9 is a diagram showing the effect of the three measuring points bouncing on the third point according to the present invention;
FIG. 10 is a diagram showing the distribution effect of three measuring points after the end of the three-measuring-point flick;
FIG. 11 is a diagram showing the effect of the four-point flick on a second point;
FIG. 12 is a diagram showing the effect of the four-point flick on the third point according to the present invention;
FIG. 13 is a diagram showing the effect of the four-point flick of the invention;
FIG. 14 is a diagram showing the distribution effect of four measuring points after the end of the four-measuring-point flick;
FIG. 15 is a schematic view of a measuring point locating module when the specified value of the edge distance of the measuring point is greater than the specified value of the distance;
FIG. 16 is a schematic view of a measuring point locating module when the specified value of the edge distance of the measuring point is smaller than the specified value of the distance.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Referring to fig. 1 to 3, in an embodiment of the method for testing the surface hardness of the grouting material in the grouting holes and the grout outlet of the sleeve according to the present invention, 4 sleeves are arranged in a prefabricated part to be tested, the inner diameter of each grouting hole is about 23mm, the inner diameter of each grout outlet is about 14mm, the diameter of the plugging end surface of the rubber plug for plugging the grouting port is 19mm, and the diameter of the plugging end surface of the rubber plug for plugging the grout outlet is 12 mm. Taking relevant regulations in Jiangsu labor engineering construction standard DB 32/T3754-2020 'testing technical specification for an assembled integral concrete structure' as an example, the regulations stipulate that the distance between any two measuring points is not less than 3mm, the distance from any measuring point to the edge of a testing surface is not less than 3mm, the outer diameter of an impact tube in a DL-type Richter durometer body is 4.2mm, the diameter of an impact head in the impact tube is 3mm, and the wall thickness of the impact tube is 0.6 mm. And in the detection of the prefabricated part, 16 measuring points are measured in total, and 3 to 6 measuring points are collected by each sleeve.
After the maintenance of the sleeve grouting material in the prefabricated part 1 is finished, the test method is based on the existing DL-type Leeb hardness tester 2, and a test point positioning module 4 is sleeved on an impact tube 3 of the DL-type Leeb hardness tester so as to improve the test efficiency and the test precision; specifically, the measuring point positioning module comprises a supporting ring 5 and an adjusting block 6, the supporting ring is used for positioning the measuring point, one end of the supporting ring is used for abutting against the detection surface, the other end of the supporting ring is connected with the adjusting block, and through holes for sleeving are formed in the supporting ring and the adjusting block; the connection of the supporting ring and the adjusting block should be defined according to the structural form of the measuring point positioning module, the supporting ring and the adjusting block can be of an integral structure, the supporting ring and the adjusting block are fixedly connected, the supporting ring and the adjusting block can also be of a split structure, and when the supporting ring and the adjusting block are of the split structure, the supporting ring and the adjusting block are connected together in an abutting mode in the using process. The axial length of support ring is greater than the distance that detects face to prefabricated component surface, when making support ring one end butt when detecting the face, other end protrusion prefabricated component surface, thereby the regulating block can not take place to interfere with the prefabricated component surface, the support ring is axial trompil structure, support ring terminal surface and detection face butt back, the support ring sets up perpendicularly on detecting the face, thereby can guarantee by the impact pipe of the DL type Leeb sclerometer of its direction also perpendicular butt on detecting the face, reach the detection effect of perpendicular bullet hitting.
An endoscopic observation lens 8 for observing the inside of a grouting pore canal and/or a grout outlet pore canal of the sleeve is arranged on the adjusting block; the measuring point positioning module has a clamping and fixing function on a probe of the endoscopic observation mirror, and the endoscopic observation mirror is mainly used for observing the grouting channel and the detection surface in the grout outlet channel of the sleeve, the measuring point positioning module and the relative position relationship between the measuring point and the measuring point positioning module; the endoscope observation mirror can be set up in an inclined manner, the probe of the endoscope observation mirror is guaranteed to face the end of the supporting ring and the butt of the detection surface, the endoscope observation mirror can directly carry out image acquisition on the supporting ring and the butt of the corresponding detection surface, and the image position is centered, so that the observation is convenient.
The diameter of the front end face of the plugging plug matched with the slurry outlet pipe with the inner diameter of 14mm is 12mm, namely the diameter of the detection surface is 12mm, so that the radial maximum size of the support ring is set to be smaller than or equal to 12mm, and the support ring can be ensured to extend into all channels to be detected and abut against the detection surface; the inner diameter of the supporting ring is equal to the outer diameter of the impact pipe, so that the impact pipe can conveniently extend into the supporting ring, the positioning effect of the position of the measuring point is met, and the size from the measuring point to the outer surface of the supporting ring is controllable and known; in the actual use process, the relevant detection standard gives a specified value of the edge distance and a specified value of the distance of the measuring points, and the support ring structure needs to be properly adjusted according to the specified value of the edge distance and the specified value of the distance of the measuring points, so that the purpose of more convenient use is achieved. In this embodiment, since the specified values of the edge distance and the distance are both 3mm, which are specified in the Jiangsu labor engineering construction standard DB 32/T3754-2020 Integrated concrete Structure testing technical Specification, the annular wall thickness of the support ring is uniformly arranged to be concentric rings, and the wall thickness of the support ring is used for controlling the distance from the measuring point to the edge of the testing surface and the distance between the measuring point and the measuring point. At this time, the maximum value of the thickness dimension from the inner wall of the impact tube positioned in the radial direction of the impact tube to the outer wall of the supporting ring is equal to the minimum value, and the thickness dimension is more than or equal to the specified value of the edge distance and the specified value of the distance of the measuring points. In order to arrange the measuring points as many as possible in consideration of the small size of the detection surface, the thickness dimension from the inner wall of the impact tube to the outer wall of the supporting ring is set to be equal to the specified value of the edge distance of the measuring points and the specified value of the distance between the measuring points, namely the wall thickness of the supporting ring is set to be 2.4mm, namely, the specification of the edge distance of 3mm and the specification of the distance of 3mm in the specification standard can be met; because the 3 mm-diameter impact head on the DL-type Leeb hardness tester body is spherical, and the diameter of the indentation left after the impact on the detection surface is smaller than that of the impact head, even if the wall thickness of the supporting ring is arranged, the distance from the actually obtained measuring point to the edge of the detection surface is slightly larger than the specified edge distance value, and the distance between the obtained measuring point and the measuring point is slightly larger than the specified distance value.
The test method of the DL-type Leeb hardness tester based on the structure size and the endoscopic observation function comprises the following steps:
firstly, determining the diameter of a detection surface; investigating and constructing plugging sizes of a grouting opening 9 and a grout outlet 10 on the surface of a plugging prefabricated part in a construction site, determining actual diameters of a grouting hole 11 and a detection surface 13 in a grout outlet hole 12 of a sleeve according to the end surface diameter of the plugging end of the plugging plug, wherein the diameter of the detection surface in the grouting hole is 19mm, and the diameter of the detection surface in the grout outlet hole is 12 mm;
then judging the maximum measuring point number; calculating the maximum measuring point number of each detection surface according to the actual diameter of the detection surface; in this example, the specified values of the edge distance of 3mm, the distance of 3mm and the diameter of the measuring point of 3mm are substituted into D +2 b. ltoreq.D < 2D +2b + c,
Calculating;
when D is more than or equal to 9mm and less than 15mm, the maximum measuring point number of the detection surface is 1; referring to fig. 4, the multi-point test requirement cannot be satisfied by moving;
when D is more than or equal to 15mm and less than 15.93mm, the maximum measuring point number of the detection surface is 2, and the method is shown in FIG. 5;
when D is more than or equal to 15.93mm and less than 17.49mm, the maximum measuring point number of the detection surface is 3, and the method is shown in FIG. 6;
when D is larger than or equal to 17.49mm, the maximum number of the measuring points of the detection surface is 4, and as shown in the reference of fig. 7 and 8, the movement space is enough, so that the multi-point test requirement can be met through movement;
judging through actual conditions, wherein the maximum measuring point number of the detection surface in the grouting pore channel is 4, the maximum measuring point number of the detection surface in the slurry outlet pore channel is 1, namely the maximum measuring point number of a single sleeve of the prefabricated part is 5;
then determining the number of actual measuring points of the detection surface according to the actual situation; selecting a specific prefabricated part, and determining the distribution condition of a plurality of measuring points to be detected in the single prefabricated part on the detection surface meeting the requirement according to the maximum measuring point number of the detection surface, the number of sleeves of the single prefabricated part, the filling degree of grouting materials in a grouting channel and a grout outlet channel of the sleeves and the apparent quality of the detection surface;
and (3) performing grouting material fullness inspection and apparent quality inspection on the detection surface on the prefabricated part, wherein the inspection result shows that the detection surface in one sleeve grouting pore channel is rough, the apparent quality of more air holes does not meet the detection requirement, and the detection surface cannot be used for collecting measuring points. After calculation, the maximum 16 measuring points (measuring points in 4 × 3 grouting channels + measuring points in 1 × 4 grout outlet channels + 16 measuring points in 16 grout outlet channels) can be tested in the four sleeves of the prefabricated component, namely all the detection surfaces are tested according to the maximum number of the measuring points, but one sleeve cannot be subjected to surface hardness test due to the fact that the detection surface in the grouting channel can only collect one measuring point on the detection surface in the grout outlet channel, and the requirement that a single sleeve collects 3-6 measuring points is not met, so that the component is reselected.
Five sleeves are distributed in the reselected component for grouting material fullness inspection and apparent mass inspection, and the inspection results show that grouting materials in grouting channels of the two sleeves are not full, the detection surfaces are incomplete, the detection surfaces in the grouting channels of the two sleeves are rough, the apparent mass of more air holes does not meet the detection requirements, and the sleeves cannot be used for collecting measuring points. After calculation, the prefabricated member can test 15 measuring points at most (measuring points in 4 × 3 grouting channels +1 × 3 slurry outlet channels are 15), that is, all the detection surfaces are tested according to the maximum number of measuring points, the requirement of testing 16 points by a single prefabricated member is still not met, and therefore, the member should be selected again.
And 5 sleeves are distributed in the reselected member again for checking the fullness and apparent quality of grouting material, the checking result completely meets the requirement, after calculation, the prefabricated member can test 25 measuring points at most, and the following measuring point distribution scheme is formulated for fully demonstrating the testing method of the invention: 4 measuring points are shot and struck in the grouting hole of the sleeve No. 1 and the sleeve No. 2, 1 measuring point is shot and struck in the grout outlet hole, 2 measuring points are shot and struck in the grouting hole of the sleeve No. 3, 1 measuring point is shot and struck in the grout outlet hole, 3 measuring points are shot and struck in the grouting hole of the sleeve No. 4, and 16 measuring points are calculated.
The actual measuring point number of the distributed single detection surface is less than or equal to the maximum measuring point number, and then the prefabricated part can be tested;
performing surface hardness test according to the number of the measuring points needing to be flicked on each detection surface; the operation method comprises the following steps that aiming at measuring point bouncing in the slurry outlet channels of the 1# sleeve, the 2# sleeve and the 3# sleeve, the measuring point positioning module extends into the corresponding slurry outlet channel and abuts against a detection surface, and bouncing tests can be carried out at any position on the detection surface;
aiming at the measuring point bouncing in the grouting pore passage of the No. 3 sleeve, the measuring point positioning module extends into the corresponding grouting pore passage and abuts against the detection surface, and then bouncing tests are carried out at two equal positions of the detection surface. During testing, the measuring point positioning module is sleeved on an impact pipe of a DL-type Leeb hardness tester, the adjusting block is held by hands, the supporting ring extends into the corresponding grouting hole, the end face abuts against the detection surface, then the adjusting block is moved to drive the supporting ring to move and assist in observation through an endoscopic observation mirror, the position of the supporting ring, which is used for controlling the edge distance of the measuring point, is tangent to the edge of the detection surface, the tangent position is selected in the 12 o 'clock direction, after the positioning is determined, the DL-type Leeb hardness tester is operated to flick, and after the positioning is determined, the flick operation is continued in the 6 o' clock direction; when the supporting ring is flicked in the direction of 6 o' clock, whether the outer edge of the supporting ring covers the flicked measuring point needs to be observed through an endoscopic observation mirror, and if the flicked measuring point is covered, the adjusting block is finely adjusted, so that the supporting ring moves and the measuring point is exposed.
Aiming at the measuring point bouncing in the grouting pore passage of the No. 4 sleeve, the measuring point positioning module extends into the corresponding grouting pore passage and abuts against the detection surface, and then bouncing test is carried out at the trisection position of the detection surface. During testing, the measuring point positioning module is sleeved on an impact tube of a DL-type Leeb hardness tester, the adjusting block is held by hands, the supporting ring extends into a corresponding grouting hole, the end face of the supporting ring abuts against a detection surface, then the adjusting block is moved to drive the supporting ring to move and assist in observation through an endoscopic observation mirror, the position of the supporting ring, which is used for controlling the edge distance of the measuring point, is tangent to the edge of the detection surface, the tangent position is selected in the 12 o ' clock direction, after the positioning is determined, the DL-type Leeb hardness tester is operated to flick, and after the flick operation is finished, the 4 o ' clock direction and the 8 o ' clock direction are selected to continue; when the supporting ring is shot in the 4 o 'clock direction and the 8 o' clock direction, whether the outer edge of the supporting ring covers the shot measuring points needs to be observed through an endoscopic observation mirror, and if the outer edge of the supporting ring covers the shot measuring points, the adjusting block is finely adjusted, so that the supporting ring moves and the measuring points are exposed;
and aiming at the impact of the measuring points in the grouting pore channels of the 1# sleeve and the 2# sleeve, the measuring point positioning module extends into the corresponding grouting pore channel and abuts against the detection surface, and then the impact test is carried out at the quartering position of the detection surface. During testing, the measuring point positioning module is sleeved on an impact tube of a DL-type Leeb hardness tester, the adjusting block is held by hands, the supporting ring extends into a corresponding grouting hole, the end face of the supporting ring abuts against a detection surface, then the adjusting block is moved to drive the supporting ring to move and assist in observation through an endoscopic observation mirror, the position of the supporting ring, which is used for controlling the edge distance of the measuring point, is tangent to the edge of the detection surface, the tangent position is selected in the 12 o 'clock direction, after the positioning is determined, the DL-type Leeb hardness tester is operated to flick, and after the flick operation is continuously performed in the 3 o' clock direction, the 6 o 'clock direction and the 9 o' clock direction; when the supporting ring is bounced in the 3 o ' clock direction, the 6 o ' clock direction and the 9 o ' clock direction, whether the outer edge of the supporting ring covers the bounced measuring point or not needs to be observed through an endoscopic observation mirror, and if the outer edge of the supporting ring covers the bounced measuring point, the adjusting block is finely adjusted, so that the supporting ring moves and the measuring point is exposed;
and finally, obtaining a detection result according to the test values of the plurality of test points.
Referring to fig. 9 and fig. 10, which are graphs showing the operation effect of the three measuring points, in the operation process, when the third measuring point is flicked, the front 2 measuring points are observed through an endoscopic observation mirror, so that the third measuring point is flicked after the avoidance is observed, and finally, three measuring points which accord with the specification are obtained.
Referring to fig. 11 and 14, a diagram of the operation effect of the four measuring points is shown, in the operation process, when the second measuring point is flicked, the first measuring point is observed through the endoscopic observation mirror, when the third measuring point is flicked, the first measuring point and the second measuring point are observed through the endoscopic observation mirror, and when the fourth measuring point is flicked, the first measuring point, the second measuring point and the third measuring point are observed through the endoscopic observation mirror, so that when the fourth measuring point is flicked after the observation is avoided, the four measuring points which meet the requirements are finally obtained.
In one embodiment, 5 sleeves are arranged in the prefabricated part, the inner diameter of a grouting hole is 18mm, the inner diameter of a grout outlet hole is 18mm, and the diameter of the end face of a plugging end of a rubber plug for plugging the grouting opening and the grout outlet is 16 mm. The single prefabricated part needs to measure 16 points in total, a single sleeve collects 3 to 6 measuring points, the diameter of an impact head of the DL-type Leeb hardness tester is 3mm, the specification specifies that the distance between any two measuring points is not less than 3mm, and the distance from any measuring point to the edge of a detection surface is not less than 3 mm. And (4) calculating according to a formula, wherein the maximum measuring point number of the detection surfaces in the grouting channel and the slurry outlet channel is 3. And (3) performing grouting material fullness inspection and apparent quality inspection on the detection surface of the prefabricated part, and finding out the inspection result: the surfaces of the detection surfaces in the grouting holes of the sleeve No. 1 and the sleeve No. 2 are rough, the apparent quality is unqualified, and the detection points cannot be acquired; the grout of the detection surface in the grout outlet hole of the 3# sleeve and the 4# sleeve is not full and can not be collected. At this time, after calculation, it is found that the prefabricated member can collect 18 measuring points at most (measuring points in 3 × 3 grouting ducts +3 out grouting ducts equal to 18), so that the following measuring point distribution scheme is made: the detection surfaces of the 1# and 2# sleeves in the slurry outlet channel are respectively impacted with 3 measuring points, the detection surfaces of the 3# and 4# sleeves in the slurry injection channel are respectively impacted with 3 measuring points, and the detection surfaces of the 5# sleeves in the slurry injection channel and the slurry outlet channel are respectively impacted with 2 measuring points.
In an embodiment, when the edge distance of the measuring points is greater than the predetermined distance, as shown in fig. 15, the supporting ring and the adjusting block are in a split structure, the outer wall surface of the supporting ring is in a diameter-variable structure, it can be considered that a diameter-variable protrusion 15 is further disposed on the annular surface of the supporting ring, the distance from the inner wall of the impact tube to the diameter-variable convex surface of the supporting ring (i.e., the outer surface of the diameter-variable protrusion) is greater than or equal to the predetermined edge distance of the measuring points, the distance from the inner wall of the impact tube to the diameter-variable concave surface of the supporting ring (i.e., the outer surface of the non-protruding portion of the supporting ring) is greater than or equal. The diameter-changing convex part is of a fan-shaped structure, and the center of the diameter-changing convex part is overlapped with the center of the supporting ring, so that the equal edge distance value is ensured when any point on the diameter-changing convex part is tangent to the edge of the detection surface. In this case, the angle range of the variable-diameter convex part in the embodiment can be within 90 degrees, so that the observation interference of the variable-diameter convex part on adjacent measuring points is reduced. The supporting ring and the adjusting block are designed to be of a split structure, so that when the rotating adjusting block drives the endoscope observation mirror to rotate for observation, the abutting position of the supporting ring is always kept unchanged.
In an embodiment, when the edge distance specified value of the measuring point is smaller than the distance specified value, as shown in fig. 16, the supporting ring and the adjusting block are in a split structure, the annular wall thicknesses of the supporting ring are all equal, a reducing convex part 15 is further arranged on the annular surface of the supporting ring, the distance from the inner wall of the impact tube to the reducing convex surface of the supporting ring (namely the outer surface of the reducing convex part) is greater than or equal to the distance specified value of the measuring point, the distance from the inner wall of the impact tube to the reducing concave surface of the supporting ring (namely the outer surface of the non-convex part of the supporting ring) is greater than or equal to the edge distance specified value of the measuring point, the annular surface of the. The variable-diameter convex part is of a fan-shaped structure, and the center of the variable-diameter convex part is overlapped with the center of the supporting ring, so that when any point on the variable-diameter convex part is matched with an adjacent measuring point for observation, the distance is a specified value. The angle range of the diameter-variable convex part in the embodiment can reach 180 degrees, and the diameter-variable convex part can be directly matched with a plurality of measuring points in multi-measuring-point detection, so that the detection efficiency is improved, and the detection difficulty is reduced.
The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (9)
1. A method for testing the surface hardness of grouting materials in a sleeve grouting hole and a grout outlet hole is characterized in that a DL-type Leeb hardness tester and a measuring point positioning module sleeved on an impact tube of the DL-type Leeb hardness tester are adopted for matching test, the measuring point positioning module comprises a supporting ring and an adjusting block, the supporting ring is used for positioning a measuring point, one end of the supporting ring is abutted to a detection surface, the other end of the supporting ring is connected with the adjusting block, and through holes for sleeving are formed in the supporting ring and the adjusting block; the adjusting block is provided with an endoscopic observation mirror for observing the inside of a grouting channel and/or a grout outlet channel of the sleeve; the axial length of the supporting ring is greater than the distance from the detection surface to the surface of the prefabricated part, the radial maximum dimension of the supporting ring is less than or equal to the diameter of the detection surface, the maximum thickness from the inner wall of the impact pipe positioned in the radial direction of the impact pipe to the outer wall of the supporting ring is greater than or equal to the larger value of the specified edge distance value and the specified distance value of the measuring points, and the minimum thickness from the inner wall of the impact pipe positioned in the radial direction of the impact pipe to the outer wall of the supporting ring is greater than or equal to the smaller value;
the test method comprises the following steps:
s1: determining the diameter of the detection surface; surveying the plugging size of a grouting opening and a grout outlet on the surface of a plugging prefabricated part in a construction site, and determining the actual diameter of a grouting hole channel and the actual diameter of a detection surface in the grout outlet hole channel of the sleeve according to the diameter of the end surface of the plugging input end;
s2: calculating the maximum measuring point number of the detection surface; calculating the maximum measuring point number which can be bounced by the detection surfaces in the grouting channel and the grout outlet channel respectively according to the actual diameter of the detection surface, the edge distance specified value and the distance specified value of the measuring points;
s3: determining the number of actual measuring points of the detection surface; selecting prefabricated components, and determining the distribution condition of a plurality of measuring points to be detected in a single prefabricated component on a detection surface meeting the requirement according to the maximum measuring point number of the detection surface, the number of sleeves contained in a single prefabricated component, the fullness of grouting materials in a grouting channel and a grout outlet channel of the sleeves and the apparent quality of the detection surface; if the actual measuring point number of a single detection surface is larger than the maximum measuring point number after distribution, the prefabricated part is reselected;
the actual measuring point number of the distributed single detection surface is less than or equal to the maximum measuring point number, and then the next step can be carried out on the prefabricated part;
s4: testing the surface hardness; testing according to the actual measuring point quantity and a corresponding operation method;
when the number of actual measuring points of the detection surface is 1, extending the measuring point positioning module into a corresponding grouting channel or a slurry outlet channel and abutting against the detection surface, taking the impact pipe as an axis, rotating the supporting ring for a circle, if the supporting ring exceeds the edge of the detection surface, indicating that the edge distance does not meet the requirement, adjusting the position until the supporting ring rotates for a circle, enabling the supporting ring to be tangent to the edge of the detection surface or to be positioned on the inner side, and performing impact test at the position;
when the number of actual measuring points of the detection surface is 2, the measuring point positioning module extends into a corresponding grouting channel or a grout outlet channel and abuts against the detection surface, the supporting ring abuts against the edge of the detection surface at a halving position to perform bounce test, when the supporting ring is bounced, an endoscopic observation mirror is used for observing whether the supporting ring is tangent to the edge of the detection surface and observing whether the supporting ring covers the bounced measuring points, the first measuring point can meet the requirement that the supporting ring is tangent to the edge of the detection surface to perform bounce test, and the second measuring point can meet the requirement that the supporting ring is tangent to the edge of the detection surface and the supporting ring does not cover the bounced measuring points to perform bounce test;
when the number of actual measuring points of the detection surface is 3, the measuring point positioning module extends into a corresponding grouting channel or a grout outlet channel and abuts against the detection surface, the supporting ring abuts against the trisection position of the edge of the detection surface to perform bounce test, when the supporting ring is bounced, an endoscopic observation mirror is used for observing whether the supporting ring is tangent to the edge of the detection surface or not and observing whether the supporting ring covers the bounced measuring points or not, the first measuring point meets the condition that the supporting ring is tangent to the edge of the detection surface to perform bounce test, and the second measuring point and the third measuring point need to meet the condition that the supporting ring is tangent to the edge of the detection surface and the supporting ring does not cover the bounced measuring points to perform bounce;
when the number of actual measuring points of the detection surface is 4, the measuring point positioning module extends into a corresponding grouting channel or a grout outlet channel and abuts against the detection surface, the supporting ring abuts against the edge of the detection surface at a quartering position to perform bounce test, when the supporting ring is bounced, an endoscopic observation mirror is used for observing whether the supporting ring is tangent to the edge of the detection surface and observing whether the supporting ring covers the bounced measuring points, the first measuring point can meet the condition that the supporting ring is tangent to the edge of the detection surface to perform bounce test, and the second measuring point, the third measuring point and the fourth measuring point can meet the condition that the supporting ring is tangent to the edge of the detection surface and the supporting ring does not cover the bounced measuring points to perform bounce test;
s5: and obtaining a detection result according to the test data of the plurality of test points.
2. The method for testing the surface hardness of the grouting material in the grouting hole and the grout outlet hole of the sleeve according to claim 1, wherein the maximum number of the test points of the test surface is determined according to the following formula in S2;
when D +2b is more than or equal to D and less than 2D +2b + c, the maximum measuring point number of the detection surface is 1;
when it is satisfied with
Then, the maximum measuring point number of the detection surface is 2;
when it is satisfied with
Then, the maximum measuring point number of the detection surface is 3;
when it is satisfied with
Then, the maximum measuring point number of the detection surface is 4;
d is the actual diameter of the detection surface, D is the diameter of the measuring point, b is the specified value of the side distance of the measuring point, c is the specified value of the distance between the measuring points, and the maximum number of the measuring points of the detection surface is determined by comparing the diameter of the detection surface with the parameters on the left side and the right side in the four formulas.
3. The method for testing the surface hardness of the grouting material in the grouting hole and the grout outlet hole of the sleeve as claimed in claim 1, wherein the wall thickness of the supporting ring is uniform, the edge distance specified value and the distance specified value of the measuring points are equal, and the wall thickness of the supporting ring is used for controlling the distance from the measuring points to the edge of the detection surface to which the measuring points belong and the distance between the measuring points.
4. The method for testing the surface hardness of the grouting material in the sleeve grouting hole and the grout outlet hole as claimed in claim 1, wherein the outer wall surface of the supporting ring is of a reducing structure;
when the specified edge distance of the measuring points is greater than the specified distance value, the reducing convex surface of the supporting ring is used for controlling the distance from the measuring points to the edge of the detection surface to which the measuring points belong, the reducing concave surface of the supporting ring is used for controlling the distance between the measuring points and the measuring points, the distance from the inner wall of the shock tube positioned in the radial direction of the shock tube to the reducing convex surface of the supporting ring is greater than or equal to the specified edge distance value of the measuring points, and the distance from the inner wall of the shock tube positioned in the radial direction of the shock tube to the;
when the specified edge distance of the measuring points is smaller than the specified distance value, the reducing concave surface of the supporting ring is used for controlling the distance from the measuring points to the edge of the detection surface to which the measuring points belong, the reducing convex surface of the supporting ring is used for controlling the distance between the measuring points and the measuring points, the distance from the inner wall of the shock tube positioned in the shock tube radial direction to the reducing concave surface of the supporting ring is larger than or equal to the specified edge distance value of the measuring points, and the distance from the inner wall of the shock tube positioned in the shock tube radial direction to the reducing convex surface of.
5. The method for testing the surface hardness of the grouting material in the grouting hole and the grout outlet hole of the sleeve as claimed in claim 1, wherein in S3, the number of the testing points collected by each sleeve is 3 to 6, and when the requirement of the number of the testing points is not met, the corresponding sleeve is directly removed.
6. The method for testing the surface hardness of the grouting material in the grouting hole and the grout outlet hole of the sleeve according to claim 1, 3 or 4, wherein when the number of actual measuring points on the detection surface is 2, the measuring point positioning module is sleeved on an impact tube of a DL-type Richter hardness tester, an adjusting block is held by hand, a supporting ring is inserted into a corresponding grouting channel or grout outlet channel, the end surface of the supporting ring abuts against the detection surface, then the adjusting block is moved to drive the supporting ring to move and assist in observation through an endoscopic observation mirror, so that the position of the supporting ring for controlling the edge distance is tangential to the edge of the detection surface, the tangential position is selected in the 12 o 'clock direction, after the positioning is determined, the DL-type Richter hardness tester is operated to perform flicking, and after the flicking operation is finished, the flicking operation is continuously performed in the 6 o' clock direction; when the supporting ring is flicked in the direction of 6 o' clock, whether the outer edge of the supporting ring covers the flicked measuring point needs to be observed through an endoscopic observation mirror, and if the flicked measuring point is covered, the adjusting block is finely adjusted, so that the supporting ring moves and the measuring point is exposed.
7. The method for testing the surface hardness of the grouting material in the grouting hole and the grout outlet of the sleeve according to claim 1, 3 or 4, wherein when the number of actual measuring points on the detection surface is 3, the measuring point positioning module is sleeved on the impact tube of a DL-type Richter hardness tester, the adjusting block is held by hand, the supporting ring is inserted into the corresponding grouting channel or grout outlet channel, the end surface is abutted against the detection surface, then the adjusting block is moved to drive the supporting ring to move and assist in observation through an endoscopic observation mirror, so that the position of the supporting ring for controlling the edge distance is tangential to the edge of the detection surface, the tangential position is selected in the 12 o ' clock direction, after the positioning is determined, the DL-type Richter hardness tester is operated to perform flicking, and after the flicking operation is finished, the 4 o ' clock direction and the 8 o ' clock direction are selected to continue to perform flicking operation; when the supporting ring is shot in the 4 o 'clock direction and the 8 o' clock direction, whether the outer edge of the supporting ring covers the shot measuring points needs to be observed through an endoscopic observation mirror, and if the outer edge of the supporting ring covers the shot measuring points, the adjusting block is finely adjusted, so that the supporting ring moves and the measuring points are exposed.
8. The method for testing the surface hardness of the grouting material in the grouting hole and the grout outlet of the sleeve according to claim 1, 3 or 4, wherein when the number of actual measuring points on the detection surface is 4, the measuring point positioning module is sleeved on an impact tube of a DL-type Richter hardness tester, an adjusting block is held by hand, a supporting ring is inserted into a corresponding grouting channel or grout outlet channel, the end surface of the supporting ring abuts against the detection surface, then the adjusting block is moved to drive the supporting ring to move and assist in observation through an endoscopic observation mirror, so that the position of the supporting ring for controlling the edge distance is tangential to the edge of the detection surface, the tangential position is selected in the 12 o 'clock direction, after the positioning is determined, the DL-type Richter hardness tester is operated to flick, and after that the flick operation is continuously performed in the 3 o' clock direction, the 6 o 'clock direction and the 9 o' clock direction; when the supporting ring is bounced in the 3 o ' clock direction, the 6 o ' clock direction and the 9 o ' clock direction, whether the outer edge of the supporting ring covers the bounced measuring point or not needs to be observed through an endoscopic observation mirror, and if the outer edge of the supporting ring covers the bounced measuring point, the adjusting block is finely adjusted, so that the supporting ring moves and the measuring point is exposed.
9. The method for testing the surface hardness of the grouting material in the grouting hole and the grout outlet of the sleeve according to claim 1, wherein the endoscopic observation mirror is obliquely arranged and faces the end part of the supporting ring on the side of the detection surface.
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