Concrete injection pressure testing device

Abstract

The invention discloses a concrete spraying pressure testing device, and belongs to the field of concrete spraying construction, the concrete spraying pressure testing device comprises a collecting plate used for collecting concrete falling after spraying, the bottom end of the collecting plate is connected with a guide rail through a sliding adjusting structure, the top end of the collecting plate is provided with a target plate, and one side of the target plate is provided with a nozzle used for spraying concrete; the target plate is provided with a pressure measuring structure used for monitoring injection pressure, and the pressure measuring structure is connected with the data collecting and monitoring device through a signal transmission line. By adopting the concrete injection pressure testing device, various experimental data of concrete injection strike can be tested in real time, and support is provided for improving the concrete injection quality and reducing the rebound rate.

Description

Technical Field

[0001] The invention relates to the technical field of concrete spraying construction, in particular to a concrete spraying pressure testing device. Background Art

[0002] Anchor spraying support is the combination of high-pressure spraying of cement concrete and metal anchors driven into the rock formation to reinforce the rock formation. It is currently the main form of support for rock shafts in mines, and is also a widely used support technology in tunnels, dams, water conservancy facilities, and underground projects. The key link in anchor spraying support operations is spraying concrete, which is to mix and stir cement, sand, gravel, and accelerators in a certain proportion, load them into a sprayer, and use compressed air or other power to make the concrete flow along the pipeline to the nozzle and spray on the rock surface to solidify and harden. According to its construction process, it is divided into dry spraying and wet spraying. Spraying concrete technology has the advantages of simple process, fast construction, wide application, and low cost. It has the functions of sealing the surface and maintaining the strength of the rock around the tunnel.

[0003] During the concrete spraying process, the motion state of the jet flow field determines the spraying quality. The jet flow field of shotcrete belongs to the three-phase flow field of gas, solid and liquid, and its shape is complex. Real-time testing of the size of concrete spraying pressure and the distribution law of spraying pressure at different positions is of great significance for studying the concrete jet flow field.

[0004] The "2020 Shotcrete Materials and Engineering Technology and Application Development Report" points out that the average rebound rate of dry shotcrete is 20%-40%, while the wet shotcrete method is relatively reduced by about 10%. Rebound not only affects the shotcrete process and wastes concrete, but also affects the quality of the project and creates safety hazards. The rebound problem of shotcrete is essentially a collision problem between concrete particles and the shotcrete surface. In order to control the rebound rate, it is necessary to consider the kinetic energy loss of shotcrete on the shotcrete surface and study the relationship between the rebound rate and the concrete shotcrete pressure.

[0005] Studying the jet flow field of shotcrete, reducing the rebound rate, ensuring the thickness and strength of the sprayed layer are crucial to the quality and cost of anchor spraying support. Therefore, a concrete spraying pressure testing device is provided to monitor the concrete spraying pressure and distribution under different spraying parameters in real time, and can be used to obtain a spraying layer close to the actual working conditions. Then, while meeting the concrete spraying quality, the concrete mix ratio and spraying parameters are adjusted to reduce the rebound rate and cost of the shotcrete, which is a problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0006] The purpose of the present invention is to provide a concrete spraying pressure testing device, which can simulate on-site construction conditions and obtain the concrete spraying pressure at different spraying distances in real time, so as to provide support for improving the concrete spraying quality and reducing the rebound rate.

[0007] To achieve the above-mentioned purpose, the present invention provides a concrete spraying pressure testing device, comprising a collecting plate for collecting concrete dropped after spraying, the bottom end of the collecting plate is connected to a guide rail through a sliding adjustment structure, a target plate is arranged at the top of the collecting plate, one side of the target plate is a nozzle for spraying concrete, a pressure measuring structure for monitoring the spraying pressure is arranged on the target plate, and the pressure measuring structure is connected to a data acquisition monitoring device through a signal transmission line.

[0008] Preferably, the sliding adjustment structure includes a sliding block, the top end of the sliding block is connected to the bottom end of the collecting plate, the sliding block is provided with a sliding groove adapted to the guide rail, the guide rail is arranged in the sliding groove and is slidably connected to the sliding groove.

[0009] Preferably, threaded holes are provided on both sides of the slider, and bolts for fixing the slider on the guide rail are provided in the threaded holes.

[0010] Preferably, the target plate has a square shape, and ribs for fixing are arranged on the sides of the target plate.

[0011] Preferably, the pressure measurement structure includes a plurality of pressure sensors, and the pressure sensors are arranged in a circular arrangement from the center of the target plate to the outside in a circumferential distribution.

[0012] Preferably, the pressure sensor is connected to the target plate via a base, a through hole is provided on the base, a hole groove corresponding to the through hole is provided on the target plate, both the through hole and the hole groove are provided with internal threads, and the pressure sensor is locked and connected to the through hole and the hole groove via external threads.

[0013] Preferably, the data acquisition monitoring device includes a host computer and a data acquisition card, the pressure sensor is connected to the data acquisition card via a signal transmission line, and the data acquisition card is connected to the host computer.

[0014] Preferably, the host computer includes a host for processing the collected data and a display for displaying the concrete spraying pressure in real time.

[0015] Therefore, the present invention adopts a concrete spraying pressure testing device of the above structure, which has the following beneficial effects: (1) The device of the present invention can test the concrete spraying pressure, rebound rate, and effective spraying area in real time, and can subsequently test the spraying layer thickness and strength, thereby providing experimental data support for improving the concrete spraying quality and reducing the rebound rate; (2) The device of the present invention can be used to study the injection pressure, rebound rate, and effective injection area under different injection modes such as different material ratios, different nozzle structural parameters, different injection distances, and different injection angles, so as to further optimize the injection process.

[0016] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 It is a schematic diagram of the arrangement of the pressure sensor according to an embodiment of the present invention; Figure 3 This is a schematic diagram of installing a pressure sensor according to an embodiment of the present invention.

[0018] Reference numerals 1. Guide rail; 2. Nozzle; 3. Slider; 4. Collecting plate; 5. Target plate; 6. Base; 7. Pressure sensor; 8. Rib plate; 9. Bolt; 10. Signal transmission line; 11. Data acquisition card; 12. Host computer. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages disclosed in the embodiments of the present invention clearer, the embodiments of the present invention are further described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention and are not intended to limit the embodiments of the present invention. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions.

[0020] It should be noted that the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or server that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products or devices.

[0021] Like reference numerals and letters denote similar items in the following drawings, and thus, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0022] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0023] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Example like Figure 1 As shown, a concrete spraying pressure test device according to the present invention comprises a collecting plate 4 for collecting concrete dropped after spraying, and the bottom end of the collecting plate 4 is connected to the guide rail 1 through a sliding adjustment structure. The collecting plate 4 can collect the concrete that rebounds and drops, and the mass of the dropped concrete and the mass of the total sprayed concrete are measured by an electronic scale or other tools to calculate the rebound rate. The rebound rate is calculated according to the following formula: Rebound rate (%) = (m1 / m0) × 100, where m1 is the mass of the concrete that rebounds and drops, and m0 is the mass of the total sprayed concrete.

[0025] The sliding adjustment structure includes a slider 3, the top of which is connected to the bottom of the collecting plate 4, and a sliding groove adapted to the guide rail 1 is provided on the slider 3, and the guide rail 1 is provided in the sliding groove and slidably connected to the sliding groove. Threaded holes are provided on both sides of the slider 3, and bolts 9 for fixing the slider 3 on the guide rail 1 are provided in the threaded holes. The target distance can be adjusted by sliding the slider 3 on the guide rail 1 according to the test requirements.

[0026] A target plate 5 is arranged at the top of the collecting plate 4. The target plate 5 is in a square shape. Ribs 8 are welded on the side of the target plate 5. The ribs 8 are used to assist in fixing the target plate 5. A nozzle 2 for spraying concrete is arranged on one side of the target plate 5. A pressure measuring structure for monitoring the spraying pressure is arranged on the target plate 5. Figure 2 As shown, the pressure measurement structure includes a plurality of pressure sensors 7, and the pressure sensors 7 are arranged in a circular arrangement from the center of the target plate 5 to the outside in a circumferential distribution. Figure 3 As shown, the pressure sensor 7 is connected to the target plate 5 through the base 6, the base 6 is provided with a through hole, the target plate 5 is provided with a hole groove corresponding to the through hole, the through hole and the hole groove are both provided with internal threads, and the pressure sensor 7 is locked and connected with the through hole and the hole groove through external threads. According to the change of pressure from inside to outside, the size of the target plate 5 (replace target plates 5 of different sizes) and the number of pressure sensors 7 can be appropriately adjusted to measure the effective spraying range of concrete. The measuring medium of the pressure sensor 7 is sharp and frictional, such as mud, sand and stone.

[0027] The pressure measurement structure is connected to the data acquisition monitoring device through a signal transmission line 10. The data acquisition monitoring device includes a host computer 12 and a data acquisition card 11. The pressure sensor 7 is connected to the data acquisition card 11 through the signal transmission line 10, and the data acquisition card 11 is connected to the host computer 12. The host computer 12 processes the data to obtain the concrete injection pressure in real time. The host computer 12 includes a host for processing the collected data and a display for displaying the concrete injection pressure in real time.

[0028] When in use, concrete is sprayed onto the target plate 5 directly opposite the center of the nozzle through the nozzle 2, and then hits the sensing diaphragm of the pressure sensor 7 arranged in the annular array on the target plate 5 (the pressure sensor 7 is on the same side as the nozzle 2, and the sprayed concrete hits the pressure sensor 7). The pressure sensor 7 converts the spray pressure received into a current signal and outputs it to the data acquisition card 11. The data acquisition card 11 converts the current signal into a digital signal and transmits it to the host computer 12. The host computer 12 can display the spray pressure of sensors at different positions in real time after processing. After the sprayed concrete is solidified and formed on the simulated tunnel surface, a spray layer close to the real working condition can be obtained, and the thickness and strength of the spray layer can be tested using relevant instruments.

[0029] Therefore, the present invention adopts the above-mentioned concrete spraying pressure testing device to obtain various experimental data of concrete spraying impact in real time, providing support for improving the quality of concrete spraying and reducing the rebound rate.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A concrete spraying pressure testing device, characterized in that: It includes a collecting plate for collecting concrete dropped after spraying, the bottom end of the collecting plate is connected to the guide rail through a sliding adjustment structure, a target plate is arranged on the top of the collecting plate, one side of the target plate is a nozzle for spraying concrete, a pressure measuring structure for monitoring the spraying pressure is arranged on the target plate, and the pressure measuring structure is connected to the data acquisition monitoring device through a signal transmission line.

2. The concrete spraying pressure testing device according to claim 1 is characterized in that: The sliding adjustment structure comprises a sliding block, the top end of which is connected to the bottom end of the collecting plate, the sliding block is provided with a sliding groove adapted to the guide rail, the guide rail is arranged in the sliding groove and is slidably connected to the sliding groove.

3. The concrete spraying pressure testing device according to claim 2 is characterized in that: Threaded holes are arranged on both sides of the slider, and bolts for fixing the slider on the guide rail are arranged in the threaded holes.

4. The concrete spraying pressure testing device according to claim 1 is characterized in that: The target plate has a square shape, and ribs for fixing are arranged on the side of the target plate.

5. The concrete spraying pressure testing device according to claim 1 is characterized in that: The pressure measurement structure comprises a plurality of pressure sensors, and the pressure sensors are arranged in a circular manner from the center of the target plate to the outside in a circular distribution.

6. The concrete spraying pressure testing device according to claim 5 is characterized in that: The pressure sensor is connected to the target plate through a base, a through hole is arranged on the base, a hole groove corresponding to the through hole is arranged on the target plate, internal threads are arranged in the through hole and the hole groove, and the pressure sensor is locked and connected to the through hole and the hole groove through external threads.

7. The concrete spraying pressure testing device according to claim 1 is characterized in that: The data acquisition monitoring device comprises a host computer and a data acquisition card. The pressure sensor is connected to the data acquisition card through a signal transmission line, and the data acquisition card is connected to the host computer.

8. The concrete spraying pressure testing device according to claim 7 is characterized in that: The upper computer includes a host computer for processing the collected data and a display for displaying the concrete spraying pressure in real time.

Images