A device and method for detecting the fullness of grouting of steel bar sleeve

Abstract

The present invention relates to a device and method for detecting the fullness of grouting of a steel sleeve. The steel sleeve of a prefabricated concrete structure is provided with a grouting outlet and a grouting outlet; it includes a first air chamber, a barometer, an air pump, a gas balance connecting pipe and a second air chamber, the first air chamber is connected to the barometer and the air pump through a pipeline; one end of the gas balance connecting pipe is connected to the air outlet on the first air chamber, and the other end is detachably connected to the second air chamber and the prefabricated concrete structure steel sleeve, and a first gas valve is provided on the gas balance connecting pipe; the second air chamber is connected to a water valve. The present invention can meet the needs of quality control of the grouting construction process of the steel sleeve and rapid detection of the fullness after grouting, and has the advantages of fast testing speed, high efficiency, high precision, stability and low cost, and provides efficient detection equipment for effectively detecting the quality acceptance of the grouting construction of steel sleeves in prefabricated concrete structures.

Description

Technical Field

[0001] The invention relates to the technical field of building quality detection, and in particular to a device for detecting the grouting fullness of a steel bar sleeve in an assembled concrete structure. Background Art

[0002] Prefabricated concrete structure is the main structural type of industrialized building. For prefabricated concrete structure, the core is the connection technology of stress-bearing steel bars. At present, most of the vertical connections of stress-bearing steel bars in prefabricated concrete structures are connected by sleeve grouting. Due to the complex structure of the steel sleeve grouting connection and the fact that it is a hidden project, the detection technology of the grouting quality inside the sleeve has not made any breakthroughs, which has become a recognized difficulty in the industry. Whether the sleeve grouting is full directly affects the shear bearing capacity and seismic resistance of the structure. In the "JGJ 1-2014 Technical Code for Prefabricated Concrete Structures", the requirements for component connections are clearly defined. Since the application of prefabricated houses in China, the industry has been studying the detection method of grouting fullness to achieve the purpose of controlling construction quality. However, the steel sleeve connection structure is a multi-layer alternating medium, such as Figure 1 As shown, it includes a first concrete member, a first steel bar, a sleeve, a second steel bar, a second concrete member, a grouting hole and a grouting hole, wherein metal and non-metal media are alternately present, and the mortar body is very thin in radial direction, generally 5 mm or 6 mm, which makes it impossible to effectively detect it using existing engineering non-destructive testing methods. Although there are some qualitative means, there is currently no reliable quantitative testing technology. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a device for detecting the fullness of the grouting of the steel sleeve. The device is based on the principle of the standard atmospheric pressure equation and accurately measures the fullness of the grouting material according to the relationship between the change in the air pressure in the first air chamber and the volume of the grouting filling defect, so as to achieve the purpose of judging whether the grouting material is filled or how much is not filled during the construction process and whether it is qualified.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A device for detecting the fullness of grouting of a steel sleeve, wherein the assembled concrete structure steel sleeve has a grout outlet and a grouting outlet;

[0006] The device includes a first air chamber, a barometer for detecting the air pressure in the first air chamber, an air pump for conveying gas into the first air chamber, a gas balance connecting pipe and a second air chamber, wherein the first air chamber is connected to the barometer and the air pump via a connecting pipe; one end of the gas balance connecting pipe is connected to the air outlet on the first air chamber, and the other end is detachably convertible to connect the second air chamber and the assembled concrete structure steel bar sleeve; a second air valve is provided on the gas balance connecting pipe; and the second air chamber is connected to a water valve.

[0007] The present invention is a device for detecting the fullness of grouting of steel sleeves.

[0008] Furthermore, the pressure gauge is connected to a pipeline connecting the air pump and the first air chamber.

[0009] The present invention is a device for detecting the fullness of grouting of a steel sleeve as described above, further comprising:

[0010] A first air valve is arranged on the pipeline between the pressure gauge and the first air chamber.

[0011] The present invention is a device for detecting the fullness of grouting of a steel sleeve as described above, further, the device

[0012] The assembled concrete structure includes a first concrete component, a first steel bar, a sleeve, a second steel bar, and a second concrete component. The first steel bar is prefabricated in the first concrete component and extends into the sleeve. The sleeve is prefabricated near one end of the first concrete component and passes through the end of the first concrete component. The second steel bar is prefabricated in the second concrete component and one end extends out of the end of the second concrete component to form a connecting section. The connecting section is located in the sleeve and is fixed by injecting concrete slurry through a grouting port.

[0013] In the present invention, sealing rings are arranged at each connection point on the first air chamber, and a certain distance is ensured between the connecting pipe and the gas balance pipe at any position on the air chamber.

[0014] The first air chamber is filled with air at a certain pressure.

[0015] Through the above technical scheme, compared with the prior art, the present invention discloses a device for detecting the fullness of grouting of steel sleeves. The device can accurately measure and determine the volume of the un-grouted area in the grouting sleeve, meet the quality control of the steel sleeve grouting construction process of prefabricated concrete structures and the needs of rapid fullness detection after grouting, and has the advantages of fast testing speed, high efficiency, high precision, stability and low cost, providing efficient detection equipment for effective detection of prefabricated concrete structure construction quality acceptance work.

[0016] The present invention also provides a method for detecting the fullness of grouting of a steel bar sleeve, comprising the following steps: using the above-mentioned device for detection, specifically comprising the following steps:

[0017] 1. Experimental test

[0018] Step (1), accurately obtain the volume of the second air chamber, fill the second air chamber with water of known density, connect the other end of the gas balance connecting pipe to the second air chamber, ensure that all components are connected intact, and open the first air valve;

[0019] Step (2), pressurizing the first air chamber by an air pump to a certain pressure P ０ , close the first air valve, open the water valve, release n ml of water, open the second air valve, and after the air pressure is balanced, read the barometer value P 1， Repeat the above steps, and finally, close the second gas valve and draw a standard curve of volume and gas pressure;

[0020] 2. On-site testing

[0021] The first air chamber is pressurized by an air pump to a certain pressure P ０， Connect the other end of the gas balance connecting pipe to the assembled concrete structure steel sleeve, open the second gas valve, and read the pressure gauge value P after the gas is balanced. Ｘ， By P Ｘ The volume of the defect position inside the steel sleeve of the prefabricated concrete structure is obtained at the position on the standard curve.

[0022] The present invention provides a method for detecting the fullness of grouting of a steel sleeve as described above, and further, the steps of calibrating the second air chamber are as follows:

[0023] S1 weighs the weight of the second air chamber M0, accurate to 0.01g;

[0024] S2 fills the second air chamber (10) with water of known density and weighs M1;

[0025] S3 calculates the volume of the second air chamber, V 标 =(M1-M0) / ρ 水 .

[0026] The present invention provides a method for detecting the fullness of grouting of a steel sleeve as described above, and further, the steps of drawing a standard curve are as follows:

[0027] S1 Check that all components are connected properly and that the first and second gas valves are closed;

[0028] After the second air chamber S2 is filled with water for calibration, start the air pump, open the first air valve, and adjust the air pressure in the first air chamber so that the pressure reading on the barometer is constant to P0;

[0029] S3 adjusts the water valve to release 1ml of water from the second air chamber;

[0030] S4 opens the second air valve to allow the gas in the first air chamber to enter the second air chamber. After the air pressure stabilizes, read the barometer value P1;

[0031] S5 repeats the above steps, releasing 1 ml of water each time, until a total of 100 ml of water is released, and records P2, P3, P4 to P n The value of

[0032] S6 draws a curve, with the cumulative volume of water released as the abscissa and the air pressure as the ordinate, to draw a standard curve;

[0033] The present invention provides a method for detecting the fullness of grouting of a steel sleeve as described above, further comprising the step (ii) of conducting on-site testing.

[0034] Before S1 test, check that all components are connected intact to ensure normal operation;

[0035] S2 connects the gas balance connecting pipe to the slurry outlet of the sleeve;

[0036] S3 starts the air pump to make the pressure reading on the barometer constant to P0;

[0037] S4 Open the second air valve to inject the gas in the first air chamber into the defective position of the grouting sleeve. After the air pressure stabilizes, record the reading of the pressure gauge P X

[0038] S5 reads the volume V of the defect position against the standard curve.

[0039] The device for detecting the grouting fullness of the steel sleeve of the present invention can also be applied to the determination of the volume and density of irregular objects such as granular matter, special-shaped blocks, etc. The steel sleeve of the present invention can be a prefabricated concrete structure steel sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of the calibration of a device for detecting the grouting fullness of a steel sleeve according to the present invention;

[0041] Figure 2 It is a schematic diagram of the grouting sleeve of the present invention;

[0042] Figure 3 This is a working schematic diagram of a device for detecting the grouting fullness of a steel sleeve according to the present invention;

[0043] Figure 4 The invention discloses a marking curve of air pressure and released water volume during the working calibration process of a device for detecting the grouting fullness of a steel sleeve.

[0044] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0045] 1. Defect location, 2. First concrete component, 3. First steel bar, 4. Sleeve, 5. Second steel bar, 6. Second concrete component, 7. Slurry outlet, 8. Grouting outlet, 9. Gas balance connecting pipe, 10. Second air chamber, 11. First air chamber, 12. Air outlet, 13. Water valve, 14. Pressure gauge, 15. Air pump, 16. First air valve, 17. Second air valve. DETAILED DESCRIPTION

[0046] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0047] like Figures 1 to 3 As shown, according to the device for detecting the grouting fullness of a steel sleeve according to an embodiment of the present invention, the steel sleeve in the assembled concrete structure has a grout outlet and a grouting outlet;

[0048] It includes a first air chamber 11, a barometer 14 for detecting the air pressure in the first air chamber, an air pump 15 for conveying gas into the first air chamber, a gas balance connecting pipe 9 and a second air chamber 10. The first air chamber 11 is connected to the barometer 14 and the air pump 15 through a connecting pipe; one end of the gas balance connecting pipe 9 is connected to the air outlet 12 on the first air chamber, and the other end is detachably convertible and connected to the second air chamber 10 and the assembled concrete structure steel sleeve; a second air valve 17 is provided on the gas balance connecting pipe 9; the second air chamber 10 is connected to a water valve 13.

[0049] Specifically, according to the device for detecting the fullness of grouting of a steel sleeve according to an embodiment of the present invention, a pressure gauge is connected to a pipeline connecting the air pump and the first air chamber, and can be used to monitor the air pressure in the first air chamber in real time.

[0050] In some embodiments, a first air valve 16 is provided on the pipeline between the air pump 15 and the first air chamber 11 to control the flow of gas between the air pump 15 and the first air chamber 11 .

[0051] Specifically, the device for detecting the fullness of grouting of a steel bar sleeve, the prefabricated concrete structure includes a first concrete component 2, a first steel bar 3, a sleeve 4, a second steel bar 5, and a second concrete component 6. The first steel bar is prefabricated in the first concrete component 2 and extends into the sleeve. The sleeve 4 is prefabricated near one end of the first concrete component 2 and passes through the end of the first concrete component 2. The second steel bar 5 is prefabricated in the second concrete component 6 and one end extends out of the end of the second concrete component 6 to form a connecting section. The connecting section is located in the sleeve 4 and is fixed by injecting concrete slurry through the grouting port 8.

[0052] The grouting material is injected into the sleeve 4 through the grouting port 8 by a grouting machine. During the grouting process, due to the complex structure of the sleeve grouting connection or manual operation, a defective position 1 is often formed in the sleeve, causing the grouting sleeve to be incomplete, affecting the shear bearing capacity and seismic resistance of the structure, and posing a safety hazard.

[0053] like Figure 1 As shown, the method for detecting the fullness of the grouting of the steel sleeve specifically comprises the following steps:

[0054] Step 1: Calibrate the second air chamber:

[0055] 1) Weigh the weight M0 of the second air chamber 10 to an accuracy of 0.01g;

[0056] 2. Fill the second air chamber 10 with water of known density and weigh M1;

[0057] 3. Calculate the volume of the second air chamber 10, V 标 =(M1-M0) / ρ 水 .

[0058] Step 2: Draw a standard curve

[0059] 1. Check that the connections of all components are intact and that the first gas valve 16 and the second gas valve 17 are closed;

[0060] 2. After the second air chamber 10 is filled with water for calibration, start the air pump 15, open the first air valve 16, adjust the air pressure of the first air chamber 11 so that the pressure reading of the barometer (14) is constant to P0, and close the first air valve 16;

[0061] 3. Adjust the water valve 13 to release 101 ml of water from the second air chamber;

[0062] 4. Open the second air valve 17 to allow the gas in the first air chamber 11 to enter the second air chamber 10. After the air pressure stabilizes, read the barometer value P1;

[0063] 5. Repeat the above steps, releasing 1 ml of water each time, until a total of 100 ml of water is released, and record P2, P3, P4 to P n The value of

[0064] 6. Draw a curve with the cumulative volume of water released as the horizontal axis and the air pressure as the vertical axis. Draw a standard curve, such as Figure 4 As shown;

[0065] Step 3: Field Testing

[0066] 1. Before testing, check that all components are connected properly to ensure normal operation;

[0067] 2. Connect the gas balance connecting pipe 9 to the slurry outlet 7 of the sleeve 4;

[0068] 3. Start the air pump 15 and adjust the first air valve 16 to make the pressure on the barometer constant to P0, and close the first air valve 16;

[0069] 4. Open the second air valve 17 to allow the gas in the first air chamber 11 to be injected into the defective position of the grouting sleeve. After the air pressure stabilizes, record the reading P of the pressure gauge;

[0070] 5. Compare with the standard curve and read the volume V of the defect location.

[0071] The method of the invention has high detection accuracy and is simple to operate.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for detecting the fullness of grouting of a steel sleeve, wherein the steel sleeve of an assembled concrete structure is provided with a grout outlet (7) and a grouting outlet (8); It is characterized in that The invention comprises a first air chamber (11), a barometer (14) for detecting the air pressure in the first air chamber, an air pump (15) for conveying air into the first air chamber, a gas balance connecting pipe (9), and a second air chamber (10); the first air chamber (11) is connected to the barometer and the air pump via a connecting pipe; one end of the gas balance connecting pipe (9) is connected to the air outlet (12) on the first air chamber, and the other end is detachably connected to the second air chamber (10) and the assembled concrete structure steel bar sleeve; a second air valve (17) is provided on the gas balance connecting pipe; the second air chamber (10) is connected to a water valve (13); and a first air valve (16) is provided on the pipeline between the barometer and the first air chamber; The detection method includes the following steps: Step 1: Draw a standard curve of volume and air pressure; S1 checks that the connections of the components are intact and that the first gas valve (16) and the second gas valve (17) are in a closed state; S2 After the second air chamber (10) is filled with calibration water, the air pump (15) is started, the first air valve (16) is opened, and the air pressure of the first air chamber (11) is adjusted so that the pressure reading of the barometer (14) is constant to P0; S3 adjusts the water valve (13) to release 1 ml of water from the second air chamber (10); S4 opens the second air valve (17) to allow the gas in the first air chamber (11) to enter the second air chamber (10), and after the air pressure stabilizes, reads the barometer value P1; S5 repeats the above steps, releasing 1 ml of water each time, until a total of 100 ml of water is released, and records the values ​​of P2, P3, P4 to Pn; S6 draws a curve, with the cumulative volume of water released as the abscissa and the air pressure as the ordinate, to draw a standard curve; Step 2: Field testing; Before S1 test, check that all components are connected intact to ensure normal operation; S2 connects the gas balance connecting pipe (9) to the slurry outlet (7) of the sleeve (4); S3 starts the air pump (15) and adjusts the first air valve (16) to make the pressure reading on the barometer constant to P0; S4: Open the second air valve (17) to allow the gas in the first air chamber (11) to be injected into the defective position of the grouting sleeve. After the air pressure stabilizes, record the reading PX of the pressure gauge. S5 reads the volume V of the defect position against the standard curve.

2. A method for detecting the fullness of grouting of a steel sleeve according to claim 1, characterized in that: The pressure gauge is connected to a pipeline communicating between the air pump and the first air chamber.

3. A method for detecting the fullness of grouting of a steel sleeve according to claim 1, characterized in that: The assembled concrete structure comprises a first concrete component (2), a first steel bar (3), a sleeve (4), a second steel bar (5), and a second concrete component (6); the first steel bar is prefabricated in the first concrete component (2) and extends into the sleeve; the sleeve (4) is prefabricated near one end of the first concrete component (2) and passes through the end of the first concrete component (2); the second steel bar (5) is prefabricated in the second concrete component (6) and one end extends out of the end of the second concrete component (6) to form a connecting section; the connecting section is located in the sleeve (4) and is fixed by injecting concrete slurry through a grouting port (8).

4. A method for detecting the fullness of grouting of a steel sleeve according to claim 1, characterized in that: The steps of calibrating the second air chamber are as follows: S1 weigh the weight M0 of the second air chamber (10) to an accuracy of 0.01 g; S2 fills the second air chamber (10) with water of known density and weighs M1; S3 calculates the volume of the second air chamber (10), Vstandard = (M1-M0) / ρwater.

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