In-situ radial compression detection device and detection method for steel sleeve grouting quality

Abstract

The present invention relates to an in-situ radial compression detection device and detection method for the quality of steel sleeve grouting, and belongs to the technical field of connection quality detection of prefabricated concrete structure engineering. The in-situ radial compression detection device for the quality of steel sleeve grouting includes a detection device, a pressure device, and a data acquisition device; the detection device is used to clamp the steel sleeve and apply a radial load to the steel sleeve, the pressure device is used to apply pressure to the detection device, and the data acquisition device is used to collect test data information transmitted by the detection device and the pressure device; the data acquisition device is externally connected to a computer. The in-situ radial compression detection device for the quality of steel sleeve grouting provided by the present invention does not require pre-embedded detection elements, and does not require carrying large-scale detection equipment. The dedicated in-situ radial compression detection device for the quality of sleeve grouting for steel connection is easy to operate, simple and easy to use, less affected by the on-site environment, and has high accuracy in data results.

Description

Technical Field

[0001] The invention relates to an in-situ radial compression detection device and a detection method for the grouting quality of a steel sleeve, and belongs to the technical field of connection quality detection of assembled concrete structure engineering. Background Art

[0002] Compared with the traditional cast-in-place structural system, the prefabricated structural system has significant advantages and has achieved very good results in practical application. Prefabricated components are centrally produced by factories, with unified size standards and a high degree of industrialization; prefabricated components are directly assembled on site, with low construction noise and no seasonal impact, and a short construction period; there is less demand for building materials on site, less material waste, and easy control and reuse of construction waste. In order to meet the growing labor costs in social development and the increasing attention of the country to energy conservation and environmental protection, prefabricated building structures have begun to enter a new stage of development.

[0003] The key to prefabricated concrete structures lies in its connection technology, among which steel sleeve grouting connection is a popular method. The steel sleeve is a combination of a specially processed sleeve, matching grouting material and steel bars. When connecting the steel bars, fast-hardening, non-shrinkage grouting material is injected to connect the steel bars and sleeves by relying on the bonding and bite action between the materials. Since the steel sleeve grouting connection has the advantages of convenient construction, firmness, reliability, economy, durability and strong practicality, it can better solve the problem of steel bar connection in prefabricated concrete structures. It is currently a commonly used method for connecting stressed steel bars in engineering.

[0004] The connection nodes of prefabricated components are theoretically weak links in prefabricated concrete structures, so the quality of steel sleeve grouting connections directly affects the safety of the structure. Studies have shown that grouting defects have a significant impact on the bearing capacity and deformation performance of steel sleeve grouting connection specimens. However, in actual projects, due to problems such as technology, management, and workers' sense of responsibility, the quality of steel sleeve grouting is difficult to guarantee. Summary of the invention

[0005] In view of the above-mentioned deficiencies, the present invention provides an in-situ radial compression detection device and method for the grouting quality of a steel sleeve.

[0006] The present invention adopts the following technical solution:

[0007] The in-situ radial compression detection device for the grouting quality of steel sleeves described in the present invention comprises a detection device, a pressurizing device, and a data acquisition device; the detection device is used to clamp the steel sleeve and apply a radial load to the steel sleeve, the pressurizing device is used to apply pressure to the detection device, and the data acquisition device is used to collect test data information transmitted by the detection device and the pressurizing device; the data acquisition device is externally connected to a computer.

[0008] The in-situ radial compression detection device for the grouting quality of steel sleeves described in the present invention comprises a crossbeam, a first column, a second column, a base, a hydraulic jack, a displacement sensor, an L-shaped baffle, and a displacement sensor; a crossbeam is provided above the base, and the crossbeam and the base are connected through a first column and a second column; the hydraulic jack is embedded in the base, and the piston end of the hydraulic jack faces the bottom end surface of the crossbeam; a square pressure strip is provided on the bottom end surface of the crossbeam, and a square steel bar is provided on the piston end of the hydraulic jack, and the steel sleeve is placed between the hydraulic jack and the crossbeam; an L-shaped baffle is provided on one side of the piston end of the hydraulic jack; the displacement sensor is fixed to the base by a clamp, and the detection end of the displacement sensor is connected to the piston end of the hydraulic jack through the L-shaped baffle.

[0009] The in-situ radial compression detection device for the grouting quality of steel sleeves described in the present invention comprises a pressurizing device which is a manual hydraulic pump and a pressure sensor; the manual hydraulic pump is connected to the hydraulic jack through a pipeline, and a ballast force is applied to the hydraulic jack through the manual hydraulic pump; the pressure sensor is connected to the manual hydraulic pump.

[0010] The in-situ radial compression detection device for the grouting quality of steel sleeves described in the present invention, the data acquisition equipment includes data acquisition device one and data acquisition device two; data acquisition device one is connected to the displacement sensor to obtain real-time data of the displacement sensor; data acquisition device two is connected to the pressure sensor to obtain real-time data of the pressure sensor.

[0011] The detection method of the in-situ radial compression detection device for the grouting quality of steel sleeves described in the present invention comprises the following steps:

[0012] Step 1: Obtain sleeves, grouting materials and steel bars used at the construction site, make sleeve specimens with full grouting and no defects, and cure them in a natural environment for 3 days;

[0013] Step 2, using an in-situ radial compression detection device to perform a radial loading test on the sleeve specimen until the grouting material inside the sleeve is destroyed, and measuring the maximum radial load P that the fully grouted sleeve can withstand;

[0014] Step 3, cleaning the surface of the grouting sleeve that has been grouted for 3 days at the construction site;

[0015] Step 4: Use a red oil-based marker with a tip diameter of 0.5 mm to mark all positioning points between the grouting port and the grout outlet on the sleeve surface;

[0016] Step 5, use the detection device to load each measuring point of the steel sleeve to be detected one by one and record the displacement value at each measuring point, and draw the displacement distribution curve based on the principle of influence line, and judge the position, length and thickness of the grouting defect by the position of the fluctuation in the displacement value distribution curve, the wavelength and the peak; make the detection part of the device clamp the sleeve, load the sleeve at the measuring point according to the mark, take the maximum load of 0.7P, record the displacement value, and then transfer to the next adjacent measuring point for loading until all measuring points are detected; then, based on the principle of influence line, connect the displacement values ​​of each measuring point on the coordinate diagram, and draw the displacement value distribution curve of each measuring point of the current sleeve. For the sleeve with full grouting, the displacement values ​​of each measuring point are basically the same, with a difference of no more than 4μm; when the measuring point enters the grouting defect area, the displacement value measured at the measuring point will increase significantly compared with the grouting full area; when the measuring point leaves the grouting defect area, the displacement value measured at the measuring point drops back to the normal range. The location of the abnormal fluctuation found in the displacement value distribution curve can be determined as the location where the grouting defect occurs.

[0017] Among them, the wavelength of abnormal fluctuation can be regarded as the length of grouting defect. According to the relationship between abnormal fluctuation wavelength, peak value and grouting defect thickness established through a large number of experiments in advance, the thickness of grouting defect can be obtained by substituting the wavelength and peak value of current abnormal fluctuation into the relationship.

[0018] Step 6: Roughly judge whether the sleeve fullness meets the requirements based on the length and thickness of the defect.

[0019] The detection method of the in-situ radial compression detection device for the grouting quality of steel sleeves described in the present invention is characterized in that: in step 4, the sleeve specimen is subjected to a radial loading test using the in-situ radial compression detection device, the device is started to apply load continuously and evenly, and the loading speed is 0.01 to 0.02 MPa per second until the specimen is destroyed, and at least three groups of prepared steel sleeves are repeatedly measured after the detection, and the maximum radial load P that each group of steel sleeves can withstand is recorded; the average value of the maximum load P is obtained, and the error of each group is within ±15%.

[0020] In the detection method of the in-situ radial compression detection device for the grouting quality of steel sleeves described in the present invention, the measuring point marks in step 3 are all offset to the same side of the measuring points by a certain distance, and the offset distance is half of the width of the layering strip, so that the mark position is exactly at the edge of the layering strip during loading. When drawing the measuring point marks, try to avoid the measuring points being at the shear keys or ring ribs. If individual measuring points are at the shear keys or ring ribs, the measuring point positions can be appropriately offset.

[0021] According to the detection method of the in-situ radial compression detection device for the grouting quality of steel sleeves described in the present invention, the position where the displacement distribution curve fluctuates greatly is the location where the defect exists, the wavelength of the curve is the length of the defect, and the thickness of the defect can be determined by the wavelength and peak value of the curve.

[0022] The detection method of the in-situ radial compression detection device for the steel bar sleeve grouting quality described in the present invention is that when the grouting defect length is less than 1.4 times the steel bar diameter, the sleeve grouting quality meets the requirements; when the grouting defect thickness is less than 4 mm, the sleeve grouting quality meets the requirements; when the grouting defect does not meet the first two requirements at the same time, the sleeve grouting quality does not meet the requirements. Beneficial Effects

[0023] The in-situ radial compression detection device for the steel bar sleeve grouting quality provided by the present invention does not require pre-embedded detection elements and does not require carrying large-scale detection equipment. The special in-situ radial compression detection device for the steel bar connection sleeve grouting quality is easy to operate, simple and practical, less affected by the on-site environment, and has high data result accuracy.

[0024] The in-situ radial compression detection device for the grouting quality of steel sleeves provided by the present invention has a simple structure, and most of the main components are ready-made commodities, which do not need to be produced independently. The production and processing of other parts are very easy, and the final assembly is also very simple, which is easy to promote; the device is suitable for detecting grouting sleeves of various sizes and has good adaptability; the device can not only detect the void defects caused by leakage, but also detect the defects caused during grouting; the loading form of the device is changed from the original cylindrical loading to square bar loading, which is more stable; the detection accuracy of the device is high and has a good detection effect.

[0025] The in-situ radial compression detection method for the grouting quality of steel sleeves provided by the present invention can intuitively judge the position and length of grouting defects through the position of fluctuations in the displacement value distribution curve as well as the wavelength and the peak, and can roughly infer the thickness of the grouting defects through the wavelength and the peak, without the need for a large number of samples as a control group. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A three-dimensional view of the device of the present invention;

[0027] Figure 2 It is a front view of the detection part of the device used in the present invention;

[0028] Figure 3 is a top view of the detection portion of the device used in the present invention;

[0029] Figure 4 It is a left side view of the detection part of the device adopted by the present invention;

[0030] Figure 5 It is a right side view of the detection part of the device adopted by the present invention;

[0031] Figure 6 It is a front view of the detection part of the device used in the present invention in a test state;

[0032] Figure 7 is a top view of the detection part of the device of the present invention in a test state;

[0033] Figure 8a It is a schematic diagram of measuring points of the present invention;

[0034] Figure 8b It is a schematic diagram of measuring point offset of the present invention;

[0035] Fig. 9 It is a displacement distribution curve diagram of each steel sleeve specimen tested by the present invention. DETAILED DESCRIPTION

[0036] In order to make the purpose and technical solution of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] like Figures 1 to 7 As shown, the present invention provides an in-situ radial compression detection device for the grouting quality of a steel sleeve, comprising a detection part A, a pressurizing part B and a data acquisition part C; the detection part A is responsible for clamping the sleeve and applying a radial load to the sleeve D, and the main components include a crossbeam 1, a column 2, a column 3, a base 4, a hydraulic jack 5 and a displacement sensor 6; the crossbeam 1 and the base 4 are connected by the columns 2 and 3, wherein the column 2 and the crossbeam 1 are an integral whole, and the column 3 is detachable; the hydraulic jack 5 is embedded in the base 4 and fixed to the base 4 by bolts 502 and nuts 503; there is a square pressure strip 101 on the crossbeam 1, and there is a square pressure strip 101 on the jack 5 The shaped steel bar 501 is used as a pressure bar when applying radial load; the displacement sensor 7 is fixed to the base 4 by the clamp 8, and the measuring rod 701 of the displacement sensor 7 is against the L-shaped baffle 6, and the L-shaped baffle 6 is fixed on the piston of the jack 4; the pressurizing part B includes a pressure sensor 10 and a manual hydraulic pump 11, which are responsible for pumping hydraulic oil to provide clamping force to the detection part A; the data acquisition part B includes a data acquisition device 12 of the displacement sensor 7 and a data acquisition device 13 of the pressure sensor 10, which are responsible for collecting the data obtained by the detection part A and the pressurizing part B and inputting them into the computer, which can display the displacement and load change curves during the loading process.

[0038] The length of the crossbeam 1 is 100-150mm (preferably 130mm), the width is 20-25mm (preferably 22mm), the height is 45-55mm (preferably 50mm), and the opening width is 9-11mm (preferably 10mm); the diameters of the columns 2 and 3 are 9-11mm (preferably 10mm), the length of the column 2 is 200-250mm (preferably 225mm), and the length of the column 3 is 150-200mm (preferably 175mm); the length of the base 4 is 10 0-150mm (preferably 135mm), width is 75-85mm (preferably 82mm), height is 40-50mm (45mm); the length of the hydraulic jack 5 is 60-70mm (preferably 64mm), width is 40-50mm (preferably 48mm), height is 35-45mm (41mm); the length of the square steel bar 101 and the square pressure strip 501 is 25-35mm (preferably 30mm), width and height are 3-6mm (preferably 4mm). The long limb of the L-shaped baffle 6 is 60-70mm (preferably 66mm), the short limb is 20-30mm (25mm), and the thickness is 3-5mm (preferably 4mm).

[0039] One side of the cross beam 1 and the base 4 is provided with an opening, so that the position of the column 3 can be adjusted at will to adapt to grouting sleeves D of different diameters.

[0040] The columns 2 and 3 are connected to the base 4 by nuts 201, 202 and 302. By rotating nuts 201, 202 and 302, the relative distance between the beam 1 and the base 4 can be adjusted to accommodate grouting sleeves D of various diameters.

[0041] The column end of the column 3 is provided with a column cap 301 , the width of the column cap 301 is slightly smaller than the opening width of the crossbeam 1 and the base 4 , and the length of the column cap 301 is greater than the opening width of the crossbeam and the base.

[0042] The displacement sensor fixture 8 is welded to the base 4 and cannot be disassembled.

[0043] The readings of the displacement sensor 7 are viewed on the data acquisition device 12, and the readings of the pressure sensor 10 can be viewed on its own display screen.

[0044] The method for using the in-situ radial compression detection device for the grouting quality of steel sleeves comprises the following steps:

[0045] 1) Line connection

[0046] Connect the circuits in the device, including the connection between the displacement sensor 7 and the data acquisition device 12, the connection between the pressure sensor 10 and the data acquisition device 13, the connection between the data acquisition device 12 and the data acquisition device 13 and the computer, and turn on the power supply;

[0047] 2) Device debugging

[0048] To debug the device, first, rotate the pressure relief valve 1102 on the manual pump counterclockwise, and tighten the pressure relief valve 1102 clockwise after the reading returns to zero; then, rotate the bolt 801 on the displacement sensor fixture 8 counterclockwise, and when the clamping of the fixture 8 becomes slightly loose, slightly adjust the position of the displacement sensor 7 so that the sensor reading is between 200-500μm, and then tighten the bolt 801 to fix the displacement sensor;

[0049] 3) Device placement

[0050] Loosen the nut 302 of the column 3 at the base 4, rotate the column 3 and remove it, rotate the crossbeam 1 to make the crossbeam 1 parallel to the grouting sleeve D, extend the crossbeam 1 along the gap of the grouting sleeve D until the crossbeam 1 completely enters the other side of the grouting sleeve D, and rotate the crossbeam 1 to make it perpendicular to the grouting sleeve D;

[0051] 4) Clamping sleeve

[0052] Insert the previously removed column 3 along the opening on one side of the base 4 and the beam 1 until the column cap 301 at the end of the column 3 completely exceeds the edge of the beam 1. Rotate the inserted column 3 so that the column 3 cannot be withdrawn. Adjust the position of the detection part A of the device so that the edge of the pressure strip 101 coincides with the mark CD1 of the first measuring point that has been drawn. Rotate nuts 201, 202, and 302 to bring the base 4 close to the beam 1 until the pressure strips 101 and 501 just clamp the grouting sleeve D. Record the initial displacement value U of the measuring point 1. min1 ,;

[0053] 5) Software Operation

[0054] Open the data acquisition software of the displacement sensor 7 and the data acquisition software of the pressure sensor 10, and open the real-time curve interface;

[0055] 6) Loading operation

[0056] Prepare a stopwatch or other timekeeping instrument. With the pressure relief valve tightened, lift the pressure rod 1101 of the manual pump 11 to the highest position. When the timing starts, slowly press the pressure rod 1101 by hand and observe the changes in the oil pressure curve displayed on the computer. Keep the growth of the oil pressure curve at roughly the same speed. Each loading process should be controlled within 30 seconds. When the oil pressure displayed on the computer reaches the specified value, stop loading.

[0057] 7) Pressure relief reflux

[0058] Rotate the pressure relief valve 1102 on the manual pump 11 counterclockwise to allow the hydraulic oil to flow back into the manual pump 11 until the oil pressure drops to zero. Record the maximum displacement value U of the measuring point 1. max1 And save the collected files;

[0059] 8) Calculation of deformation

[0060] The radial deformation S1=U of the grouting sleeve D after the loading at measuring point 1 is completed max1 -U min1 ;

[0061] 9) Move to the next measuring point

[0062] Rotate the nuts 201, 202 and 203 to loosen the clamping of the sleeve D, and move the detection part A to the next detection point to continue the detection.

[0063] like Figure 8a , Figure 8b to Figure 9 As shown, the present invention provides an in-situ radial compression detection method for the grouting quality of a steel bar connection sleeve, comprising the following steps:

[0064] Step 1: Preparation and curing of full sleeve specimens

[0065] (1.1) Preparation of fully grouted sleeve specimens: Obtain sleeves and grouting materials used at the construction site and steel bars of appropriate length. After assembly, use grouting equipment to inject the mixed grouting material from the grouting port until the grouting port overflows. Repeat the injection of grouting material from the grouting port at least 3 times after an interval of 30 seconds to complete the fully grouted sleeve specimen;

[0066] (1.2) Curing of grouting full sleeve specimens: The prepared full sleeve specimens are placed under natural conditions and cured at room temperature for 3 days.

[0067] Step 2: Determine the maximum radial load P that the fully grouted sleeve can withstand.

[0068] (2.1) After the curing period of the full sleeve specimens, the full sleeve specimens and the ungrouted sleeve specimens are prepared for testing, and the radial loading points are marked on the sleeve surface in the middle of the steel bar anchorage so that the loading path passes through the center of the middle cross section of the sleeve;

[0069] (2.2) Place the specimen between the upper and lower loading heads to ensure that the loading point coincides with the marking point; start the device to apply load continuously and evenly at a loading rate of 0.01 to 0.02 MPa per second until the specimen is destroyed. When the test is completed, record the maximum radial load that the steel sleeve can withstand; repeat the test on at least three groups of grouting-filled sleeve specimens and finally calculate the average value of the maximum load P. The error of each group should be within ±15%.

[0070] Step 3: Clean the surface of the grouting sleeve

[0071] At the construction site, clean the surface of the grouting sleeve that has been grouted for 3 days. First, use a small shovel to scrape off the grouting material that flows out of the sleeve surface during grouting, and then use sandpaper to further polish the traces that are not scraped clean until they are smooth;

[0072] Step 4: Draw the mark of the positioning point on the sleeve surface

[0073] First, place the tape measure flat on the surface of the sleeve, ensuring that the tape measure is parallel to the axis of the sleeve, and then use a red oil-based marker with a tip diameter of 0.5 mm to draw positioning points every 5 mm between the grouting port and the grouting outlet on the sleeve surface;

[0074] When marking the positioning measuring points on the sleeve surface, the measuring point marks are offset to the same side of the measuring points by a certain distance, which is half the width of the beading strip, so that the marking position is exactly at the edge of the beading strip when loading; when drawing the measuring point marks, try to avoid the measuring points being at the shear key or ring rib. If individual measuring points are at the shear key or ring rib, the measuring point position can be appropriately offset;

[0075] Step 5: Draw a displacement distribution map and identify defects

[0076] Use the detection device to load at each measuring point and record the displacement value at each measuring point, and draw the displacement distribution curve based on the principle of influence line. The position and length of the grouting defect can be intuitively judged by the position of the fluctuation in the displacement value distribution curve, as well as the wavelength and peak. The thickness of the grouting defect can be roughly estimated by the wavelength and peak.

[0077] Step 6: Determine the quality of sleeve grouting

[0078] The length and thickness of the defect can be used to roughly judge whether the sleeve grouting quality meets the requirements. When the grouting defect length is less than 1.4 times the steel bar diameter (considering the anchoring length to be 8 times the steel bar diameter), the sleeve grouting quality meets the requirements; when the grouting defect thickness is less than 4mm, the sleeve grouting quality meets the requirements; when the grouting defect does not meet the first two requirements at the same time, the sleeve grouting quality does not meet the requirements. Example

[0079] Taking the GTXQ4-14 fully grouting sleeve as an example, the test specimen is designed for common horizontal grouting defects and simulated using ABAQUS finite element software. With the help of the concrete constitutive model and the mechanical test results of the Sino-German Xinya grouting material, the constitutive relationship of the grouting material is established to simulate the mechanical properties of the grouting material. Tie binding constraints are used between the sleeve and the grouting material, and between the grouting material and the sleeve. The displacement distribution curves of each steel sleeve are shown in Fig. 9 The defects are shown in Table 1.

[0080] Table 1 Grouting defects of steel sleeve specimens

[0081] Steel sleeve test piece Specific circumstances of grouting defects BM Grouting full B-2D-3mm Defect in the middle of horizontal grouting, length is 2 times the diameter of the steel bar, thickness is 3mm B-2D-6mm Defect in the middle of horizontal grouting, length is 2 times the diameter of the steel bar, thickness is 6mm B-2D-9mm Defect in the middle of horizontal grouting, length is 2 times the diameter of the steel bar, thickness is 9mm

[0082] It can be seen from the curve that when the loading position is within the horizontal grouting defect range, the radial deformation of the sleeve will increase, and the closer the loading position is to the middle of the defect, the greater the deformation; when the defect thickness is larger, the deformation is also larger. This shows that the in-situ radial compression detection method is theoretically feasible.

[0083] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An in-situ radial compression detection device for steel sleeve grouting quality, characterized in that: It includes a detection device, a pressure device, and a data acquisition device; the detection device is used to clamp the steel sleeve and apply a radial load to the steel sleeve, the pressure device is used to apply pressure to the detection device, and the data acquisition device is used to collect the test data information transmitted by the detection device and the pressure device; the data acquisition device is externally connected to a computer; The detection device comprises a crossbeam, a first column, a second column, a base, a hydraulic jack, a displacement sensor, an L-shaped baffle, and a displacement sensor; a crossbeam is arranged above the base, and the crossbeam is connected to the base through a first column and a second column; the hydraulic jack is embedded in the base, and the piston end of the hydraulic jack faces the bottom end surface of the crossbeam; a square pressure strip is arranged on the bottom end surface of the crossbeam, a square steel bar is arranged on the piston end of the hydraulic jack, and a steel sleeve is arranged between the hydraulic jack and the crossbeam; an L-shaped baffle is arranged on one side of the piston end of the hydraulic jack; the displacement sensor is fixed to the base by a clamp, and the detection end of the displacement sensor is connected to the piston end of the hydraulic jack through the L-shaped baffle; The pressurizing device is a manual hydraulic pump and a pressure sensor; the manual hydraulic pump is connected to the hydraulic jack through a pipeline, and a ballast force is applied to the hydraulic jack through the manual hydraulic pump; the pressure sensor is connected to the manual hydraulic pump; The data acquisition device comprises a data acquisition device 1 and a data acquisition device 2; the data acquisition device 1 is connected to the displacement sensor to obtain real-time data of the displacement sensor; the data acquisition device 2 is connected to the pressure sensor to obtain real-time data of the pressure sensor.

2. A detection method using the in-situ radial compression detection device for steel sleeve grouting quality according to claim 1, characterized in that: Here are the steps: Step 1: Obtain sleeves, grouting materials and steel bars used at the construction site, make sleeve specimens with full grouting and no defects, and cure them in a natural environment for 3 days; Step 2, using an in-situ radial compression detection device to perform a radial loading test on the sleeve specimen until the grouting material inside the sleeve is destroyed, and measuring the maximum radial load P that the fully grouted sleeve can withstand; Step 3, cleaning the surface of the grouting sleeve that has been grouted for 3 days at the construction site; Step 4: Use a red oil-based marker with a tip diameter of 0.5 mm to mark all positioning points between the grouting port and the grout outlet on the sleeve surface; Step 5, use the detection device to load each measuring point of the steel sleeve to be detected one by one and record the displacement value at each measuring point, and draw a displacement distribution curve based on the principle of influence line, and judge the position, length and thickness of the grouting defect by the position of the fluctuation in the displacement value distribution curve, the wavelength and the peak; make the detection part of the device clamp the sleeve, load the sleeve at the measuring point position according to the mark, take the maximum load of 0.7P, record the displacement value, and then transfer to the next adjacent measuring point for loading until all measuring points are detected; Step 6: Roughly judge whether the sleeve fullness meets the requirements based on the length and thickness of the defect.

3. The detection method of the in-situ radial compression detection device for steel sleeve grouting quality according to claim 2 is characterized in that: In step 4, the radial loading test of the sleeve specimen is carried out using an in-situ radial compression detection device, the device is started to continuously and evenly load, the loading speed is 0.01-0.02 MPa per second, until the specimen is destroyed, and at least three groups of prepared steel sleeves are repeatedly measured after the test, and the maximum radial load P that each group of steel sleeves can withstand is recorded; The average value of the maximum load P was obtained, and the error of each group was within ±15%.

4. The detection method of the in-situ radial compression detection device for steel sleeve grouting quality according to claim 2 is characterized in that: The measuring point marks in step 3 are all offset to the same side of the measuring point by a certain distance, and the offset distance is half of the width of the layering strip, so that the mark position is exactly at the edge of the layering strip during loading.

5. The detection method of the in-situ radial compression detection device for steel sleeve grouting quality according to claim 2 is characterized in that: The location where the displacement distribution curve fluctuates greatly is where the defect exists, and the wavelength of the curve is the length of the defect. The thickness of the defect can be determined by the wavelength and peak value of the curve.

6. The detection method of the in-situ radial compression detection device for steel sleeve grouting quality according to claim 2 is characterized in that: When the length of the grouting defect is less than 1.4 times the diameter of the steel bar, the sleeve grouting quality meets the requirements; when the thickness of the grouting defect is less than 4mm, the sleeve grouting quality meets the requirements; when the grouting defect does not meet the first two requirements at the same time, the sleeve grouting quality does not meet the requirements.

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