Device for detecting concrete spraying speed

Abstract

The utility model discloses a device for detecting the spraying speed of concrete, which comprises a spraying pipe and a nozzle, a U-shaped pipe is arranged right above the spraying pipe at the joint of the nozzle and the spraying pipe, two ends of the U-shaped pipe are respectively connected and communicated with two symmetrical sides of the spraying pipe, and a pressure sensor is arranged at the top in the U-shaped pipe. According to the utility model, the U-shaped pipe is communicated with the spray pipe at the nozzle, so that the U-shaped pipe is filled with circulating concrete, the spraying speed of the concrete is calculated by measuring the pressure of the concrete on the U-shaped pipe, and construction personnel can conveniently control the pumping pressure to adjust the spraying speed of the concrete.

Description

Technical Field

[0001] The utility model belongs to the technical field of tunnel construction, and in particular relates to a device for detecting concrete spraying speed. Background Art

[0002] During tunnel construction, a large amount of shotcrete is used. However, in actual construction, a large amount of concrete rebounds after being sprayed onto the wall, resulting in a huge waste of resources and increasing the cost of construction. Reasonable adjustment of the spraying speed of shotcrete at the nozzle of the spray pipe can effectively reduce the rebound rate of shotcrete when it contacts the wall. At present, the spraying speed of concrete is basically controlled by construction workers through construction experience, resulting in unstable control of the rebound rate of shotcrete. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a device for detecting the concrete spraying speed in view of the above-mentioned deficiencies in the prior art, which can detect the spraying speed of concrete at the nozzle of the spray pipe without hindering the construction operation.

[0004] The technical solution adopted by the utility model is: a device for detecting concrete spraying speed, comprising a spray pipe and a nozzle, a U-shaped tube is arranged just above the spray pipe at the connection between the nozzle and the spray pipe, two ends of the U-shaped tube are respectively connected and communicated with two symmetrical sides of the spray pipe, and a pressure sensor is installed at the top of the U-shaped tube.

[0005] Preferably, the U-shaped tube is a hose, and a tube support is installed at the bottom of the U-shaped tube at a position symmetrical to the nozzle axis, and the bottom of the tube support is fixed to the outer wall of the nozzle through a support rod.

[0006] The beneficial effect of the utility model is that the utility model is connected with the spray pipe at the nozzle through the U-shaped tube, so that the circulating concrete fills the U-shaped tube, and the injection speed of the concrete is calculated by measuring the pressure caused by the concrete on the U-shaped tube, which makes it convenient for construction personnel to control the pumping pressure to adjust the concrete injection speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a cross-sectional schematic diagram of the utility model;

[0008] Figure 2 It is a schematic diagram of the structure of the utility model.

[0009] In the figure: 1. nozzle; 2. nozzle; 3. U-shaped tube; 4. pressure sensor; 5. pipe support; 6. support rod. DETAILED DESCRIPTION

[0010] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0011] Example

[0012] like Figure 1 and Figure 2 As shown, the device for detecting concrete spraying speed provided by this embodiment includes a nozzle 1 and a nozzle 2. A U-shaped tube 3 is provided just above the nozzle 1 at the connection between the nozzle 2 and the nozzle 1. The two ends of the U-shaped tube 3 are respectively connected and communicated with the two symmetrical sides of the nozzle 1. A pressure sensor 4 is installed at the top of the U-shaped tube 3. The U-shaped tube 3 adopts a hose. A pipe support 5 is installed at the bottom of the U-shaped tube 3 at a position symmetrical to the axis of the nozzle 1. The bottom of the pipe support 5 is fixed to the outer wall of the nozzle 1 through a support rod 6.

[0013] Working principle of the utility model: Since the concrete flowing at the nozzle 2 is turbulent, that is, the fluid velocity at different points in a vertical section of the nozzle 1 is not necessarily the same, we can only measure the average velocity of the fluid ejected at a certain moment. By setting a U-shaped tube 3, and connecting the two ends of the U-shaped tube 3 to the symmetrical two sides of the nozzle 1, and at this time, the U-shaped tube 3 is located directly above the nozzle 1, and the midpoint of the U-shaped tube 3 and the midpoint of the nozzle 1 are located on the same vertical plane;

[0014] When the fluid starts to move and moves stably, the U-shaped tube 3 is filled with concrete, and the height difference between the pressure sensor 4 located at the top of the U-shaped tube 3 and the central axis of the nozzle 1 is h. The mechanical energy of the concrete in the U-shaped tube 3 and the concrete in the nozzle 1 is conserved;

[0015] Assume that the average velocity of concrete in the pipeline is v1, the pipeline height is z1, and the pressure is the local atmospheric pressure (since nozzle 2 is connected to the outside, the opening of nozzle 2 is relatively large), that is, the relative atmospheric pressure is 0;

[0016] After the U-shaped tube 3 is filled with concrete, the flow velocity of the concrete in the U-shaped tube 3 is 0, the height of the pressure sensor 4 is z2, and the pressure is p0 relative to the atmospheric pressure.

[0017] When the nozzles are at the same height, the energy of the concrete in the U-tube 3 and the concrete in the nozzle 1 is conserved, which can be expressed by the Bernoulli equation: is a fixed value, so we can get:

[0018]

[0019] z2-z1 is the height difference between the pressure sensor 4 at the top of the U-shaped tube 3 and the central axis of the nozzle 1, which is h;

[0020] Right now

[0021]

[0022] It can be known from the above deduction that the average spraying speed of concrete at the nozzle can be obtained by the utility model by only obtaining the density of concrete and the local atmospheric pressure.

[0023] The above is only a preferred implementation of the present invention, but the protection scope of the present invention is not limited thereto, and any modification and replacement based on the technical solution and inventive concept provided by the present invention should be included in the protection scope of the present invention.

Claims

1. A device for detecting concrete spraying speed, comprising a spray pipe (1) and a nozzle (2), characterized in that: A U-shaped tube (3) is provided directly above the nozzle (1) at the connection between the nozzle (2) and the nozzle (1), and the two ends of the U-shaped tube (3) are respectively connected to and communicated with the two symmetrical sides of the nozzle (1), and a pressure sensor (4) is installed at the top of the U-shaped tube (3).

2. The device for detecting concrete spraying speed according to claim 1, characterized in that: The U-shaped tube (3) is a soft tube, and a tube support (5) is installed at the bottom of the U-shaped tube (3) at a position symmetrical to the axis of the nozzle (1), and the bottom of the tube support (5) is fixed to the outer wall of the nozzle (1) via a support rod (6).

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