A concrete air content detection system and detection method

Abstract

The embodiment of the present application relates to a concrete air content detection system and detection method, the detection system includes a negative pressure chamber and a detection chamber that can be placed on the negative pressure chamber, a connecting pipe located in the detection chamber, a negative pressure pipe whose first end is connected to the top surface of the negative pressure chamber, a vacuum module whose input end is connected to the negative pressure chamber, a pressure gauge whose detection end extends into the negative pressure chamber, and a sealing unit provided on the detection chamber, wherein the first end of the connecting pipe is connected to the bottom surface of the detection chamber, the second end of the negative pressure pipe can pass through the connecting pipe, and the sealing unit is used to block the second end of the negative pressure pipe. The concrete air content detection system and detection method disclosed in the embodiment of the present application can improve the detection speed of concrete air content.

Description

Technical Field

[0001] The present application relates to the technical field of quality detection, and in particular to a concrete air content detection system and detection method. Background Art

[0002] The voids formed by concrete materials, admixtures and gases produced during mixing will seriously affect the density of concrete. Currently, the equipment used on site has many operating steps and is relatively cumbersome to use. Summary of the invention

[0003] The embodiments of the present application provide a concrete air content detection system and a detection method, which can improve the detection speed of concrete air content.

[0004] The above-mentioned purpose of the embodiment of the present application is achieved through the following technical solutions:

[0005] In a first aspect, an embodiment of the present application provides a concrete air content detection system, comprising:

[0006] A negative pressure chamber and a detection chamber that can be placed on the negative pressure chamber;

[0007] A connecting tube is located in the detection chamber, and a first end of the connecting tube is connected to the bottom surface of the detection chamber;

[0008] A negative pressure tube, the first end of which is in communication with the top surface of the negative pressure chamber and the second end of which can pass through the connecting tube;

[0009] A vacuum module, an input end of which is connected to the negative pressure chamber;

[0010] A pressure gauge, the detection end of which extends into the negative pressure chamber; and

[0011] The sealing unit is arranged on the detection chamber and is used for sealing the second end of the negative pressure tube.

[0012] In a possible implementation manner of the first aspect, the connecting pipes are arranged in an MxN matrix form, where M and N are both natural numbers greater than zero;

[0013] The arrangement form of the negative pressure pipe is the same as that of the connecting pipe.

[0014] In a possible implementation of the first aspect, an elastic connecting tube is provided on the inner wall of the connecting tube;

[0015] In the axial direction of the elastic connecting tube, a plurality of annular sealing cavities are arranged at intervals on the inner wall of the elastic connecting tube.

[0016] In a possible implementation of the first aspect, the device further includes an annular sealing chamber, the annular sealing chamber including a first annular sealing groove provided on the top surface of the negative pressure chamber and a second annular sealing groove provided on the bottom surface of the detection chamber;

[0017] The negative pressure pipe is located in the area surrounded by the first annular sealing groove;

[0018] The connecting pipe is located in the area surrounded by the second annular sealing groove;

[0019] It also includes a valve connected to the annular sealing chamber, and the valve is arranged on the negative pressure chamber or the detection chamber.

[0020] In a possible implementation of the first aspect, there are multiple annular sealing chambers;

[0021] In the direction close to the negative pressure tube, the front annular sealing cavity is located in the area surrounded by the rear annular sealing cavity;

[0022] It also includes a connecting groove arranged on the negative pressure chamber and / or the detection chamber, and the connecting groove is sequentially connected with the multiple annular sealing cavities.

[0023] In a possible implementation manner of the first aspect, the sealing unit includes:

[0024] Electric cylinder, located in the testing room;

[0025] A pressure plate, provided on the piston of the electric cylinder; and

[0026] Elastic sealing pads are evenly distributed on the working surface of the pressing plate;

[0027] The electric cylinder can push the elastic sealing pad to abut against the second end of the negative pressure tube.

[0028] In a possible implementation of the first aspect, scale lines are provided on the inner wall of the detection chamber;

[0029] In a direction perpendicular to the bottom surface of the detection chamber, a plurality of scale lines are arranged at intervals.

[0030] In a first aspect, an embodiment of the present application provides a method for detecting air content in concrete, comprising:

[0031] Lay the sample flat on the bottom surface of the test chamber, with the height of the sample lower than the length of the connecting tube;

[0032] Calculate the remaining space volume of the detection room;

[0033] Extract the air in the negative pressure chamber until the negative pressure chamber is in a vacuum state;

[0034] Connect the testing room and the negative pressure room;

[0035] Obtaining the pressure value in the negative pressure chamber after a specified time; and

[0036] Calculate the gas content in the sample based on the pressure value. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of a concrete air content detection system provided in an embodiment of the present application.

[0038] Figure 2 It is a structural schematic diagram of the top surface of a negative pressure chamber provided in an embodiment of the present application.

[0039] Figure 3 It is a structural schematic diagram of the bottom surface of a detection chamber provided in an embodiment of the present application.

[0040] Figure 4 yes Figure 1 Enlarged schematic diagram of part A.

[0041] In the figure, 11, negative pressure chamber, 12, detection chamber, 13, connecting pipe, 14, negative pressure pipe, 15, vacuum module, 16, pressure gauge, 17, sealing unit, 21, elastic connecting pipe, 22, annular sealing chamber, 3, negative pressure sealing chamber, 31, first annular sealing groove, 32, second annular sealing groove, 33, valve, 34, connecting groove, 171, electric cylinder, 172, pressure plate, 173, elastic sealing pad, 4, scale line. DETAILED DESCRIPTION

[0042] The technical solution in this application is further described in detail below in conjunction with the accompanying drawings.

[0043] See also Figure 1 , is a concrete air content detection system disclosed in an embodiment of the present application, the system consists of a negative pressure chamber 11, a detection chamber 12, a connecting pipe 13, a negative pressure pipe 14, a vacuum module 15, a pressure gauge 16 and a sealing unit 17. Taking the situation during use as a reference, the negative pressure chamber 11 is placed on a horizontal plane, and the detection chamber 12 needs to be placed on the top surface of the negative pressure chamber 11, that is, the bottom surface of the detection chamber 12 will be in direct contact with the top surface of the negative pressure chamber 11.

[0044] A plurality of connecting tubes 13 are provided in the detection chamber 12. The first end of the connecting tube 13 is connected to the bottom surface of the detection chamber 12, and the second end is connected to the space inside the detection chamber 12. That is, the function of the connecting tube 13 is to connect the space inside the detection chamber 12 with the external space.

[0045] The first end of the negative pressure tube 14 is connected to the top surface of the negative pressure chamber 11, and the second end can pass through the connecting tube 13. That is, the second end of the negative pressure tube 14 can be directly inserted into the detection chamber 12 to connect the space in the negative pressure chamber 11 with the space in the detection chamber 12.

[0046] The input end of the vacuum module 15 is connected to the negative pressure chamber 11, and its function is to extract the gas in the negative pressure chamber 11 and reduce the air pressure in the negative pressure chamber 11. The detection end of the pressure gauge 16 extends into the negative pressure chamber 11, and its function is to detect the air pressure in the negative pressure chamber 11.

[0047] The sealing unit 17 is disposed on the detection chamber 12 and functions to seal the second end of the negative pressure tube 14 to prevent the gas in the detection chamber 12 from flowing into the negative pressure chamber 11 when the vacuum module 15 evacuates the negative pressure chamber 11 .

[0048] In conjunction with a specific testing process, the staff pours a certain amount of concrete into the testing chamber 12. The pouring method can be to open the feeding end on the testing chamber 12. After pouring the concrete, let it stand for a period of time so that the concrete can flow to a self-leveling state, or the staff can shake the testing chamber 12 back and forth on a horizontal plane to speed up the flow of concrete.

[0049] Of course, during this process, the sealing unit 17 may also be used to block the second end of the connecting pipe 13 to prevent concrete from flowing into the interior of the connecting pipe 13 .

[0050] Next, the detection chamber 12 is placed on the top surface of the negative pressure chamber 11. During this process, each negative pressure tube 14 can be inserted into the corresponding connecting tube 13. After the bottom surface of the detection chamber 12 contacts the top surface of the negative pressure chamber 11, the relative positions of the two are adjusted.

[0051] Then, the sealing unit 17 is adjusted so that the sealing unit 17 blocks the second end of the negative pressure tube 14 (that is, the end extending into the detection chamber 12). The vacuum module 15 starts to work and extracts the gas in the negative pressure chamber 11 until the value displayed on the pressure gauge 16 reaches the required value, and then the vacuum module 15 stops working.

[0052] Then the sealing unit 17 breaks away from the second end of the negative pressure tube 14 (that is, the end extending into the detection chamber 12 ), and the air in the detection chamber 12 begins to enter the negative pressure chamber 11 . At the same time, the gas in the concrete on the bottom surface of the detection chamber 12 also begins to escape and enter the detection chamber 12 or the negative pressure chamber 11 .

[0053] During this process, the value displayed on the pressure gauge 16 will gradually increase. After reaching the specified time, the value displayed on the pressure gauge 16 is recorded, and then the corresponding air content in the concrete is queried according to the table.

[0054] The theoretical analysis is as follows:

[0055] The volume of the space inside the negative pressure chamber 11 is S1, and the volume of the remaining space after adding concrete into the detection chamber 12 is S2. If S2 is temporarily used as the volume of the space inside the detection chamber 12, then after a portion of the gas in the negative pressure chamber 11 is extracted or completely extracted, the negative pressure chamber 11 is connected to the detection chamber 12, and the value displayed on the pressure gauge 16 is determined, which is recorded as D1 here.

[0056] In the actual detection process, the gas in the concrete escapes, that is, the value displayed on the pressure gauge 16 will increase, which is recorded as D2 here. The difference between D2 and D1 is the value corresponding to the air content of the concrete. By querying the corresponding data in the table, the air content of the concrete placed in the detection chamber 12 at this time can be obtained.

[0057] After the detection is completed, a new detection chamber 12 can be immediately replaced to detect the next sample, which can effectively improve the detection speed.

[0058] See also Figure 2 and Figure 3 As a specific implementation of the concrete air content detection system, the connecting pipes 13 are arranged in a matrix form of MxN, and at the same time, the negative pressure pipes 14 are arranged in a matrix form of MxN, where M and N are both natural numbers greater than zero. This arrangement has two functions. The first is to facilitate manufacturing, and the second is to enable the space in the negative pressure chamber 11 and the space in the detection chamber 12 to be connected through multiple locations at the same time, which helps to improve the accuracy of the detection results.

[0059] It should be understood that when the negative pressure chamber 11 is connected to the detection chamber 12, the air pressure change in the detection chamber 12 is not uniform, but is related to the distance between the negative pressure tube 14. The closer to the negative pressure tube 14, the faster the air pressure changes. The speed of air pressure change will also directly affect the escape speed of air in the concrete.

[0060] Increasing the number of connecting tubes 13 and negative pressure tubes 14 and fully covering the space in the detection chamber 12 as much as possible can make the detection result more accurate.

[0061] See also Figure 4 As a specific implementation of the concrete air content detection system, an elastic connecting tube 21 is provided on the inner wall of the connecting tube 13, and a plurality of annular sealing cavities 22 are provided at intervals on the inner wall of the elastic connecting tube 21 in the axial direction of the elastic connecting tube 21. The elastic connecting tube 21 is used to improve the sealing performance and prevent the external air from flowing into the detection chamber 12 through the gap.

[0062] The role of adding multiple annular sealing cavities 22 is to increase the contact area between the elastic connecting tube 21 and the connecting tube 13, thereby improving the sealing effect. If the tube wall of the elastic connecting tube 21 is in direct contact with the connecting tube 13, in order to ensure convenient insertion, the inner diameter of the elastic connecting tube 21 must be increased, resulting in a decrease in the sealing effect. Using multiple annular sealing cavities 22 can take into account both the sealing effect and the convenience of use.

[0063] See also Figure 1As a specific implementation of the concrete air content detection system, a negative pressure sealing chamber 3 is added. The negative pressure sealing chamber 3 consists of a first annular sealing groove 31 arranged on the top surface of the negative pressure chamber 11 and a second annular sealing groove 32 arranged on the bottom surface of the detection chamber 12. The negative pressure pipe 14 is located in the area surrounded by the first annular sealing groove 31, and the connecting pipe 13 is located in the area surrounded by the second annular sealing groove 32.

[0064] The function of the negative pressure sealing cavity 3 is to improve the sealing performance of the connection between the negative pressure chamber 11 and the detection chamber 12 to prevent external air from flowing into the detection chamber 12 through the gap between the top surface of the negative pressure chamber 11 and the bottom surface of the detection chamber 12 .

[0065] The negative pressure sealing chamber 3 is connected to an external vacuum device via a valve 33 . The valve 33 can be installed on the negative pressure chamber 11 or on the detection chamber 12 .

[0066] In some possible implementations, the valve 33 is connected to the vacuum module 15 .

[0067] Furthermore, the number of negative pressure sealing chambers 3 is increased to multiple, and the diameters of these negative pressure sealing chambers 3 or the areas of the sealing regions are sequentially reduced, that is, in the direction approaching the negative pressure tube 14, the previous negative pressure sealing chamber 3 is located in the area enclosed by the next negative pressure sealing chamber 3.

[0068] These negative pressure sealed chambers 3 are connected via a connecting groove 34 , which is located on the top surface of the negative pressure chamber 11 or the bottom surface of the detection chamber 12 , or is divided into two parts, which are located on the top surface of the negative pressure chamber 11 and the bottom surface of the detection chamber 12 respectively.

[0069] See also Figure 1 As a specific implementation of the concrete air content detection system, the sealing unit 17 is composed of an electric cylinder 171, a pressure plate 172 and an elastic sealing pad 173. The electric cylinder 171 is located in the detection chamber 12, and the pressure plate 172 is set on the piston of the electric cylinder 171. It can move towards and away from the bottom surface of the detection chamber 12 under the drive of the electric cylinder 171.

[0070] The elastic sealing pads 173 are evenly distributed on the working surface of the pressing plate 172 , and can contact the second end of the connecting tube 13 and the second end of the negative pressure tube 14 to seal the second end of the connecting tube 13 and the second end of the negative pressure tube 14 .

[0071] See also Figure 1 As a specific implementation of the concrete air content detection system, a scale line 4 is added to the inner wall of the detection chamber 12. The function of the scale line 4 is to facilitate the staff to control the volume of the sample.

[0072] Furthermore, in a direction perpendicular to the bottom surface of the detection chamber 12 , a plurality of scale lines 4 are arranged at intervals.

[0073] The present application also discloses a method for detecting air content in concrete, comprising the following steps:

[0074] S101, spreading the sample on the bottom surface of the detection chamber 12, wherein the height of the sample is lower than the length of the connecting tube 13;

[0075] S102, calculating the remaining space volume of the detection chamber 12;

[0076] S103, extracting air from the negative pressure chamber 11 until the negative pressure chamber is in a vacuum state;

[0077] S104, connecting the detection chamber 12 and the negative pressure chamber 111;

[0078] S105, obtaining the pressure value in the negative pressure chamber 11 after a specified time; and

[0079] S106, calculating the gas content in the sample according to the pressure value.

[0080] The method has been explained in the above content and will not be repeated here.

[0081] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A concrete air content detection system, characterized in that: include: A negative pressure chamber (11) and a detection chamber (12) that can be placed on the negative pressure chamber (11); A connecting tube (13) is located in the detection chamber (12), and a first end of the connecting tube (13) is in communication with the bottom surface of the detection chamber (12); A negative pressure tube (14), a first end of which is in communication with the top surface of the negative pressure chamber (11), and a second end of which is capable of passing through the connecting tube (13); A vacuum module (15), the input end of which is connected to the negative pressure chamber (11); A pressure gauge (16), the detection end of which extends into the negative pressure chamber (11); and A sealing unit (17) is provided on the detection chamber (12) and is used to seal the second end of the negative pressure tube (14) so ​​as to connect or disconnect the negative pressure chamber (11) and the detection chamber (12); An elastic connecting tube (21) is provided on the inner wall of the connecting tube (13); In the axial direction of the elastic connecting tube (21), a plurality of annular sealing cavities (22) are provided at intervals on the inner wall of the elastic connecting tube (21); It also includes a negative pressure sealing chamber (3), the negative pressure sealing chamber (3) including a first annular sealing groove (31) provided on the top surface of the negative pressure chamber (11) and a second annular sealing groove (32) provided on the bottom surface of the detection chamber (12); The negative pressure pipe (14) is located in the area surrounded by the first annular sealing groove (31); The connecting pipe (13) is located in the area surrounded by the second annular sealing groove (32); It also includes a valve (33) connected to the negative pressure sealing chamber (3), the valve (33) being arranged on the negative pressure chamber (11) or the detection chamber (12); The number of negative pressure sealing chambers (3) is multiple; In a direction close to the negative pressure tube (14), the front negative pressure sealed cavity (3) is located within the area enclosed by the rear negative pressure sealed cavity (3); It also includes a connecting groove (34) provided on the negative pressure chamber (11) and / or the detection chamber (12), wherein the connecting groove (34) is sequentially connected to the plurality of negative pressure sealing chambers (3).

2. A concrete air content detection system according to claim 1, characterized in that: The connecting pipes (13) are arranged in a matrix form of MxN, where M and N are both natural numbers greater than zero; The arrangement form of the negative pressure tube (14) is the same as the arrangement form of the connecting tube (13).

3. A concrete air content detection system according to claim 1, characterized in that: The sealing unit (17) comprises: An electric cylinder (171) is disposed in the detection chamber (12); A pressure plate (172) is provided on the piston of the electric cylinder (171); and Elastic sealing pads (173) are evenly distributed on the working surface of the pressing plate (172); The electric cylinder (171) is capable of pushing the elastic sealing pad (173) to abut against the second end of the negative pressure tube (14).

4. A concrete air content detection system according to claim 1, characterized in that: The inner wall of the detection chamber (12) is provided with scale lines (4); In a direction perpendicular to the bottom surface of the detection chamber (12), a plurality of scale lines (4) are arranged at intervals.

5. A detection method for a concrete air content detection system according to any one of claims 1 to 4, characterized in that: include: Lay the sample flat on the bottom surface of the test chamber, with the height of the sample lower than the length of the connecting tube; Calculate the remaining space volume of the detection room; Extract the air in the negative pressure chamber until the negative pressure chamber is in a vacuum state; Connect the testing room and the negative pressure room; Obtaining the pressure value in the negative pressure chamber after a specified time; and Calculate the gas content in the sample based on the pressure value.

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