A handheld rapid detection device and detection method for the grouting pressure of precast slabs

Abstract

The present invention discloses a handheld rapid detection device and method for the grouting pressure of precast slabs, belonging to the technical field of building quality inspection. The detection device includes a composite rubber stopper and a handheld measurement host; the composite rubber stopper is a disposable item, and the composite rubber stopper includes a rubber stopper installed in the slurry overflow port of the sleeve. A measuring rod is coaxially arranged inside the rubber stopper, and the measuring rod can move axially; the handheld measurement host is located outside the slurry overflow port of the sleeve and is arranged axially. The handheld measurement host includes a chassis, and a pressure sensor, a single-chip microcomputer, a display screen, and a rechargeable battery are electrically connected inside the chassis. A limiting end that contacts and limits the slurry overflow port of the sleeve is provided at the left end of the chassis, and a handle is provided at the right end of the chassis. The handheld rapid detection device for the grouting pressure of precast slabs provided by the present invention has a simple structure, low production cost, convenient use, sensitive measurement, high detection efficiency, can perform multiple measurements and obtain real-time pressure values.

Description

Technical Field

[0001] The present invention belongs to the technical field of building quality inspection, and more specifically, relates to a handheld rapid detection device and method for the grouting pressure of precast slabs. Background Technique

[0002] As a structural form that conforms to the industrialized production method, precast concrete slabs have the advantages of fast construction, low labor intensity, low noise pollution, and easy control of product quality, and have become the mainstream development direction of the international construction industry. At present, the vertical connection of stressed steel bars in precast concrete structures mostly uses sleeve cement grouting connection. Due to the complex structure of the steel sleeve grouting connection and it being a concealed project, the detection technology for the grouting quality inside the sleeve has not been broken through, becoming a recognized difficulty in the industry. The Ministry of Housing and Urban-Rural Development issued the industry standard "Technical Specification for Precast Concrete Structures" as early as 2014, which clearly stipulates the requirements for component connections. Whether the grouting inside the sleeve is full directly affects the shear bearing capacity and seismic resistance of the structure.

[0003] The cement grouting material contains solid particles and has adhesiveness. It will expand slightly during curing and is prone to adhering to the measuring instruments that come into contact with it. After using a conventional instrument to complete the slurry pressure measurement and immediately withdrawing the instrument, slurry leakage will occur. After the slurry cures, the conventional instrument will be contaminated or damaged by the adhesion of cement and it is very difficult to perform re-measurement. Therefore, it is difficult to measure the cement grouting pressure using conventional hydraulic gauges, pneumatic gauges, and diaphragm pressure gauges.

[0004] At present, there are many methods for detecting the fullness of sleeve grouting connection of precast concrete slabs, mainly including the embedded wire pulling method, the embedded sensor method, the endoscope method, the ultrasonic method, the X-ray method, the industrial CT technology, etc.

[0005] Chinese Patent CN208255027U discloses a sleeve grouting fullness detection device based on the embedded wire pulling method. Its essence is to embed a wire at the slurry outlet of the sleeve. After grouting and curing, the embedded wire is pulled, and the grouting fullness is judged according to the pulling load value.

[0006] Chinese Patent CN105223344A discloses a method and detector for detecting the fullness of steel sleeve grouting in precast concrete structures by the embedded sensor method. Its essence is to embed a sensor inside the sleeve, collect specific excitation signals of the sensor, and judge the fullness of sleeve grouting according to the change of amplitude.

[0007] Chinese Patent CN109211909A discloses a method for detecting the grouting fullness of a sleeve based on core drilling. Its essence is to drill a hole in the slurry outlet hole of the sleeve, insert the endoscope probe into the sleeve from the slurry outlet hole of the sleeve, and judge the grouting fullness in the sleeve according to the endoscope display result. The above three methods will cause certain damage to the prefabricated building, and in actual engineering detection, it is relatively difficult to insert the sensor into the assembled sleeve.

[0008] Chinese Patent CN109470769A discloses a method and system for detecting the grouting fullness of a sleeve by ultrasonic reflection method. Its essence is to utilize the characteristic that the propagation speed of ultrasonic waves is different in a sleeve with dense grouting and a sleeve with grouting voids, and adopt the first wave arrival time method to judge the grouting degree in the sleeve. Since the ultrasonic wave propagates fast in concrete and the detection distance is short, and the time difference between the ultrasonic wave propagating along a straight line and along the sleeve wall is small, the sensitivity of detecting the grouting fullness of the sleeve is not high.

[0009] Chinese Patent CN108663385A discloses a mobile detection device for the grouting fullness of a steel bar sleeve. Its essence is to perform tomographic imaging on the inside of the sleeve according to the principle of X-ray flaw detection, and judge the grouting fullness in the sleeve. However, the detection instruments of both methods are relatively bulky, and the detection efficiency is low and the detection cost is high, so it is difficult to popularize and apply in actual engineering detection.

[0010] Chinese Patent CN215339849U discloses a monitor for the grouting fullness of a sleeve. Its essence is to form a communicating vessel with the sleeve through a communicating pipe, and observe the height of the slurry in the communicating pipe to judge whether the sleeve is grouted full, but it is impossible to accurately know the true pressure in the communicating pipe. In this measurement method, the grouting material must enter the plastic pipe for measurement, which causes waste of the grouting material.

[0011] Chinese Patent CN214035820U discloses an oil pressure alarm based on an elastic diaphragm. The oil pressure acts on the sensing part, and by judging whether the sensing part and the detection part are conducted, the pressure state of the oil is judged. This patent can only judge whether the oil pressure is normal or too low, and cannot measure the specific oil pressure value.

[0012] Chinese Patent CN201748103U discloses an isolation type pressure limiting valve. One side of the piston is connected with a spring whose expansion and contraction is controlled by a regulator, and the other end face and the lower part of the inner cavity of the valve housing form a cavity communicated with the fluid storage soft bag. When the fluid pressure in the pipeline is too large, the piston moves upward, causing the fluid pressure in the pipeline to drop. It is a method of pressure regulation and cannot measure the specific fluid pressure in the pipeline.

[0013] Chinese patent CN1385685 discloses a pressure sensor that measures pressure by controlling the deformation of a film of the pressure sensor through a positioner or a force transmitter. When the film structure in the patent encounters a viscous slurry, the slurry will stick to the film, making it impossible to perform multiple measurements.

[0014] In summary, in the prior art, when measuring the grouting pressure in the sleeve, the detection device has one or more of the following problems: inconvenient installation, insensitive measurement, low detection efficiency, high detection cost, easy waste of grouting material, difficulty in multiple measurements and inability to measure real-time values. Summary of the invention

[0015] In view of the defects of the prior art, the purpose of the present invention is to provide a handheld prefabricated board grouting pressure rapid detection device and method, aiming to solve the problems in the prior art such as inconvenient installation of the detection device, insensitive measurement, low detection efficiency, high detection cost, easy waste of grouting material, difficulty in multiple measurements and inability to measure real-time values.

[0016] To achieve the above-mentioned purpose, the present invention provides a handheld prefabricated board grouting pressure rapid detection device, which is used to measure the grouting pressure in a sleeve, including a composite rubber plug and a handheld measuring host; the composite rubber plug is a disposable item, and the composite rubber plug includes a rubber plug installed in a sleeve overflow port, and a measuring rod is coaxially arranged in the rubber plug, and the measuring rod can move axially; the handheld measuring host is located outside the sleeve overflow port and is arranged axially, and the handheld measuring host includes a chassis, and an electrically connected pressure sensor, a single-chip microcomputer, a display screen and a rechargeable battery are arranged in the chassis, a limit end that contacts and limits the overflow port of the sleeve is provided at the left end of the chassis, and a handle is provided at the right end of the chassis.

[0017] Furthermore, the rubber stopper is axially provided with a through hole, the measuring rod is inserted into the through hole, the left end of the rubber stopper is provided with a guide groove, the left end of the measuring rod is provided with a guide portion corresponding to the guide groove, and the right end of the measuring rod is provided with a measuring portion in contact with the pressure sensor.

[0018] Furthermore, the chassis is also provided with a Type-C interface for data transmission with an external host, and a Bluetooth communication module for data transmission with a mobile phone.

[0019] Furthermore, the cross-section of the measuring rod is I-shaped.

[0020] Furthermore, a data storage module is also provided in the chassis for storing the data of the pressure sensor and the measured real-time pressure value of the slurry.

[0021] Further, an alarm module electrically connected to the pressure sensor is also provided inside the chassis. A safety pressure value is preset on the alarm module. If the pressure value measured by the pressure sensor is greater than the safety pressure value, the alarm module will issue an alarm.

[0022] Further, both the guiding portion and the measuring portion are disc structures.

[0023] A method for quickly detecting the grouting pressure of precast slabs includes the following steps:

[0024] S1. According to the grouting construction specification, install the composite rubber plug at the slurry overflow port of the sleeve.

[0025] S2. Hold the handle and align the limiting portion on the handheld measuring host with the end of the sleeve slurry overflow port, so that the pressure sensor and the end of the measuring rod are aligned and fitted. Then push the handheld measuring host along the axial direction of the sleeve slurry overflow port, so that the pressure sensor fits the measuring rod, and push the measuring rod to move left until the end face of the limiting portion fits the end face of the sleeve slurry overflow port.

[0026] S3. The single-chip microcomputer collects the data of the pressure sensor, calculates through the pressure algorithm, and compensates for the friction force received when the measuring rod moves left, calculates the pressure of the slurry in the sleeve, and displays the pressure value on the display screen.

[0027] S4. According to the grouting construction situation, repeat steps S2 and S3 at regular intervals to measure the pressure of the slurry in the sleeve. Synchronously display and compare the pressure values obtained from each measurement on the display screen. If the pressure values measured each time gradually tend to be the same, it indicates that the slurry in the sleeve is full.

[0028] Generally speaking, compared with the prior art through the above technical solutions conceived by the present invention, the following beneficial effects are obtained:

[0029] (1) The handheld precast slab grouting pressure rapid detection device of the present invention adopts a split design, including two parts: a composite rubber plug and a handheld measuring host. The rubber plug and the measuring rod in the composite rubber plug are separately installed in the sleeve slurry overflow port, which can achieve quick installation and seal the sleeve slurry overflow port to avoid waste of grouting material. At the same time, the handheld measuring host can be used alone. The construction personnel only need to hold the handle of the handheld measuring host, make the pressure sensor fit the measuring rod and gently push the measuring rod to perform the measurement. The measurement has high sensitivity and convenient operation. The overall structure is simple and ingenious, greatly reducing the detection cost and being convenient to use; the composite rubber plug is a disposable item, which can be used for multiple measurements after one installation. There is no need to disassemble and assemble after grouting is completed, greatly reducing the work intensity of construction personnel.

[0030] (2) In addition, inside the handheld measurement host, a single-chip microcomputer is used to collect the data of the pressure sensor, perform pressure calculations, and compensate for the frictional force to obtain the real-time pressure value of the slurry inside the sleeve. At the same time, it can be synchronously displayed on the display screen for convenient reading. Multiple measurements can be carried out. According to the progress of the grouting construction, the pressure of the slurry inside the sleeve is measured at regular intervals, and the measured pressure values are synchronously displayed and compared on the display screen to facilitate the judgment of whether the grouting is full.

[0031] (3) Moreover, a limiting part for limiting the overflow port of the sleeve is provided on the chassis, which can prevent the pressure sensor from being affected by external pressure during use and affecting the measurement result of the pressure of the slurry inside the sleeve. An alarm module is provided to prevent damage to the handheld measurement host due to excessive pressure. A data storage module is provided to save the data of the pressure sensor and the real-time measured pressure value. It can perform data transmission with an external host through a Type-C interface, and a Bluetooth communication module for data transmission with a mobile phone is also provided, which can transmit the measured pressure value to the mobile phone for convenient data recording and sharing. Description of the Drawings

[0032] Figure 1 is a schematic structural diagram of a handheld rapid detection device for the grouting pressure of precast wall panels provided by the present invention;

[0033] The structures corresponding to the various numerical markings in the drawings are: 1 - sleeve, 2 - rubber stopper, 3 - sleeve overflow port, 4 - measuring rod, 5 - limiting part, 6 - handle, 7 - pressure sensor, 8 - single-chip microcomputer, 9 - display screen, 10 - rechargeable battery, 11 - Type-C interface, 12 - Bluetooth communication module, 13 - rechargeable battery. Detailed Embodiments

[0034] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] Refer to Figure 1 , the present invention provides a handheld rapid detection device for the grouting pressure of precast wall panels, which is used to rapidly detect the pressure of the slurry inside the steel sleeve of the precast slab, and indirectly measure the fullness of the grouting inside the sleeve 1 by detecting the pressure of the slurry inside the sleeve 1. For example, Figure 1As shown, P and the arrow indicate the transmission direction of the grout pressure in the sleeve during grouting. It includes a composite rubber plug and a handheld measuring host. For ease of use, the composite rubber plug is a disposable item and is installed in the sleeve overflow port 3 before measurement. It does not need to be disassembled and assembled later, which reduces the work intensity of construction personnel. Specifically, the composite rubber plug includes a rubber plug 2 installed in the sleeve overflow port 3, and a measuring rod 4 is coaxially arranged in the rubber plug 2, which can move axially. The handheld measuring host is located outside the sleeve overflow port 3 and is arranged axially. It is used to cooperate with the measuring rod 4 to measure the pressure in the sleeve 1, and includes a chassis. An electrically connected pressure sensor 7, a single-chip computer 8, a display screen 9 and a rechargeable battery 10 are arranged in the chassis. A limit end 5 that contacts the sleeve overflow port 3 is provided at the left end of the chassis, and a handle 6 is provided at the right end of the chassis. In this embodiment, in order to further reduce production costs, the single-chip computer 8 adopts an STM32 single-chip computer.

[0036] Furthermore, the rubber stopper 2 is provided with a through hole in the axial direction, and the measuring rod 4 is inserted into the through hole; in order to guide the axial movement of the measuring rod 4, a guide groove is provided at the left end of the rubber stopper 2, a guide portion corresponding to the guide groove is provided at the left end of the measuring rod 4, and a measuring portion in contact with the pressure sensor is provided at the right end of the measuring rod 4, such as Figure 1 As shown, the cross section of the measuring rod 4 is an I-shaped, and the guide part and the measuring part are both disc structures. Before measuring with the handheld measuring body, the measuring rod 4 is pushed outward by the slurry under the pressure of the slurry inside the sleeve, and the end face of the guide part of the measuring rod 4 and the inner wall of the guide groove are in a fitting state.

[0037] In order to facilitate data transmission between the handheld measurement host and the external host, a Type-C interface 11 for data transmission with the external host (such as a host computer) is also provided in the chassis. At the same time, in order to facilitate data recording and sharing, a Bluetooth communication module 12 for data transmission with a mobile phone is also provided in the chassis.

[0038] In order to facilitate the handheld measuring host to store the data of the pressure sensor and the measured real-time pressure value of the slurry, a data storage module 13 is also provided in the chassis.

[0039] Furthermore, in order to prevent the handheld measuring host from being damaged due to excessive pressure, an alarm module electrically connected to the pressure sensor 7 is provided in the chassis. A safety pressure value is preset on the alarm module. If the pressure value measured by the pressure sensor is greater than the safety pressure value, the alarm module will sound an alarm.

[0040] When the handheld precast slab grouting pressure rapid detection device of the present invention is in use, the operator holds the handle 6 of the measuring host tightly, makes the pressure sensor 7 contact with the measuring section of the measuring rod 4, and slowly pushes the measuring rod 4 into the sleeve until it fits against the end face of the overflow port 3 of the sleeve by the limiting part 5 and cannot be pushed further. The STM32 single-chip microcomputer calculates the grout pressure in the sleeve by collecting the data of the pressure sensor, cooperating with the pressure extraction algorithm, and compensating for the friction force received at the front end of the measuring rod, and displays the measured data on the liquid crystal screen.

[0041] In addition, in this embodiment, the data storage module 13 uses a Flash chip and can store the pressure data obtained from each measurement. By sending a command to the data storage module 13 by the host computer, the stored pressure data can be read.

[0042] When the grout pressure in the sleeve can be stably maintained greater than a certain value, it can be considered that the inside of the sleeve is filled with grout. After the grout solidifies, the fullness in the sleeve will be guaranteed. On the construction site, it is necessary to measure the grout pressure at regular intervals before the grout solidifies. If the grout pressures measured multiple times are basically the same, it can be considered that there is no grout leakage and the fullness of the grout in the sleeve can be guaranteed.

[0043] Based on the above detection device, the present invention also provides a method for rapidly detecting the grouting pressure of precast slabs, which includes the following steps:

[0044] S1. Install the composite rubber plug on the overflow port of the sleeve according to the grouting construction specification;

[0045] S2. Hold the handle and align the limiting part on the handheld measuring host with the end of the overflow port of the sleeve, align the pressure sensor and the end of the measuring rod to fit, and push the handheld measuring host axially along the overflow port of the sleeve to make the pressure sensor fit against the measuring rod, and push the measuring rod to move left until the end face of the limiting part fits against the end face of the overflow port of the sleeve;

[0046] S3. The single-chip microcomputer collects the data of the pressure sensor, calculates the grout pressure in the sleeve through the pressure algorithm and compensates for the friction force received when the measuring rod moves left, and displays the pressure value on the display screen;

[0047] S4. According to the grouting construction situation, measure the grout pressure in the sleeve by repeating steps S2 and S3 at regular intervals, synchronously display and compare the pressure values obtained from each measurement on the display screen. If the pressure values measured each time gradually tend to be the same, it indicates that the grout in the sleeve is full.

[0048] Those skilled in the art can easily understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A handheld rapid detection device for the grouting pressure of precast slabs, used to measure the grout pressure inside the sleeve (1), characterized in that: It includes a composite rubber stopper and a handheld measuring host; the composite rubber stopper is a disposable item, and the composite rubber stopper includes a rubber stopper (2) installed in the overflow port (3) of the sleeve, and a measuring rod (4) is coaxially arranged in the rubber stopper (2), and the measuring rod (4) can move axially; the handheld measuring host is located outside the overflow port (3) of the sleeve and is arranged axially. The handheld measuring host includes a chassis, and a pressure sensor (7), a single-chip microcomputer (8), a display screen (9) and a rechargeable battery (10) which are electrically connected are arranged in the chassis. A limiting end (5) in contact with the overflow port (3) of the sleeve is arranged at the left end of the chassis, and a handle (6) is arranged at the right end of the chassis; A through hole is axially formed in the rubber stopper (2), the measuring rod (4) is arranged in the through hole, a guiding groove is arranged at the left end of the rubber stopper (2), a guiding part corresponding to the guiding groove is arranged at the left end of the measuring rod (4), and a measuring part in contact with the pressure sensor is arranged at the right end of the measuring rod (4).

2. The handheld precast slab grouting pressure rapid detection device according to claim 1, characterized in that: A Type-C interface (11) for data transmission with an external host and a Bluetooth communication module (12) for data transmission with a mobile phone are further arranged in the chassis.

3. The handheld precast slab grouting pressure rapid detection device according to claim 1, characterized in that: The cross section of the measuring rod (4) is in the shape of a Chinese character 'gong'.

4. The handheld precast slab grouting pressure rapid detection device according to claim 1, wherein: A data storage module (13) is further arranged in the chassis for storing the data of the pressure sensor and the real-time pressure value of the measured slurry.

5. The handheld precast slab grouting pressure rapid detection device according to claim 1, characterized in that: An alarm module electrically connected to the pressure sensor (7) is further arranged in the chassis. A safety pressure value is preset on the alarm module. If the pressure value measured by the pressure sensor is greater than the safety pressure value, the alarm module will give an alarm.

6. The handheld precast slab grouting pressure rapid detection device according to claim 1, wherein: Both the guiding part and the measuring part are in the structure of a disc.

7. A method for quickly detecting the grouting pressure of a precast slab realized by using the handheld precast slab grouting pressure quick detection device according to any one of claims 1-6, which includes the following steps: S1. Install the composite rubber stopper at the overflow port of the sleeve according to the grouting construction specification; S2. Hold the handle, align the limiting part on the handheld measuring host with the end of the overflow port of the sleeve, align the pressure sensor and the end of the measuring rod and fit them, and push the handheld measuring host axially along the overflow port of the sleeve to make the pressure sensor fit the measuring rod, and push the measuring rod to move left until the end face of the limiting part fits the end face of the overflow port of the sleeve; S3. The single-chip microcomputer collects the data of the pressure sensor, calculates the pressure of the slurry in the sleeve through a pressure algorithm and compensates for the friction force received when the measuring rod moves left, and displays the pressure value on the display screen; S4. According to the grouting construction situation, repeat steps S2 and S3 to measure the pressure of the slurry in the sleeve at intervals, synchronously display and compare the pressure values obtained each time on the display screen. If the pressure values measured each time gradually tend to be the same, it indicates that the slurry in the sleeve is full.

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