Water mist curtain dust suppression device for tunnel construction

Abstract

The utility model belongs to the technical field of tunnel construction, and specifically relates to a water mist curtain dust reduction device for tunnel construction, including a mist nozzle and a support stand for supporting the water mist nozzle, the support stand including a stand body and a plurality of adjustable support components, the adjustable support component including a fixed cylinder, a screw, an adjusting member and a U-shaped bracket, the fixed cylinder is fixedly connected to the stand body, the adjusting member is threadedly connected to the screw, the adjusting member can abut against one end of the fixed cylinder away from the stand body, the U-shaped bracket is fixedly connected to the screw, and the water mist nozzle can be sunk into the U-shaped bracket. In the utility model, the adjustable support component can support water mist nozzles of different specifications, so that the support stand can be applicable to tunnels of various structures, and has good universality. Moreover, each adjustable support component is not fixedly connected to the water mist nozzle, and the water mist nozzle can be quickly replaced, avoiding cutting and welding operations, and the operation is simple, which is conducive to improving construction efficiency and reducing construction costs.

Description

Technical Field

[0001] The utility model belongs to the technical field of tunnels, and in particular relates to a water mist curtain dust reduction device used for tunnel construction. Background Art

[0002] During tunnel construction, drilling and blasting operations, concrete spraying, ballast loading and ballast transportation, and tunnel boring machine excavation will generate a large amount of dust, which seriously affects the environment and facilities of the construction site and causes harm to the health of on-site construction workers. Therefore, dust removal technical measures must be taken in tunnel engineering to control the dust concentration below the allowable concentration. Water mist curtain dust reduction is one of the tunnel dust removal technologies. It uses a water curtain to isolate the dust generated during the excavation of the face and allows the dust to fall with the water curtain particles. At present, the water mist curtain dust reduction device usually includes a water mist nozzle and a support frame for supporting the water mist nozzle. In order to ensure the stability of the water mist nozzle, the water mist nozzle is usually welded to the support frame. The device is mostly designed according to its own engineering construction structure and is not universal in general use. Once the construction is completed and it is used in other tunnels, if the water mist nozzle does not match the tunnel structure, it will lead to poor dust reduction effect. The water mist nozzle needs to be cut and removed from the support frame, and then a water mist nozzle matching the tunnel structure is welded. The operation is cumbersome and affects the construction efficiency. Utility Model Content

[0003] The utility model aims to provide a water mist curtain dust reduction device for tunnel construction, so as to solve the problem of poor universality of traditional water mist curtain dust reduction devices.

[0004] In order to achieve the above-mentioned purpose, the scheme of the utility model is: a water mist curtain dust reduction device for tunnel construction, including a mist nozzle and a supporting frame for supporting the water mist nozzle, the supporting frame including a frame body and a plurality of adjustable supporting components, the adjustable supporting components including a fixed cylinder, a screw, an adjusting member and a U-shaped bracket, the fixed cylinder is fixedly connected to the frame body, the adjusting member is threadedly connected to the screw, the adjusting member can be abutted against one end of the fixed cylinder away from the frame body, the U-shaped bracket is fixedly connected to the screw, and the water mist nozzle can be sunk into the U-shaped bracket.

[0005] The working principle and beneficial effects of this solution are as follows: In this solution, the adjustable support assembly on the main body of the platform can adjust the effective support length of the adjustable support assembly by rotating the adjustment member and changing the position of the adjustment member on the screw rod, so as to cooperate with the support of water mist nozzles of different specifications. Moreover, each adjustable support assembly is not fixedly connected to the water mist nozzle and can be quickly disassembled to avoid cutting and welding operations, so as to quickly complete the replacement of the water mist nozzle. Therefore, the support platform in this solution can be applied to tunnels of various structures, has good universality, and avoids cutting and welding operations when replacing the water mist nozzle. It is simple to operate, which is conducive to improving construction efficiency and reducing construction costs.

[0006] Optionally, a plurality of adjustable support assemblies are symmetrically arranged along the vertical center line of the platform body.

[0007] In this solution, the adjustable support assembly is symmetrical to the support points of the water mist nozzle, thereby achieving balanced support for the water mist nozzle.

[0008] Optionally, there are two groups of adjustable support components located at the top of the stand body, the two groups of adjustable support components are tilted, and a connecting rod is provided between the fixed cylinders of the two groups of adjustable support components.

[0009] In this solution, the fixing cylinders in the two groups of adjustable support assemblies that are tilted are connected by a connecting rod, thereby enhancing the stability of the two groups of adjustable support assemblies.

[0010] Optionally, an oblique rod is provided between the fixing cylinder in the adjustable support assembly located on both sides of the platform body and the platform body.

[0011] In this solution, the fixed cylinder and the stand body are connected by an oblique rod, so that the adjustable support components located on both sides of the stand body are subjected to an oblique support force, thereby improving the stability of the adjustable support components located on both sides of the stand body.

[0012] Optionally, casters are fixedly mounted on the bottom end of the platform body, and the casters can move the platform body along the tunnel.

[0013] In this solution, the design of casters facilitates the movement of the entire device in the tunnel, thereby adjusting the position of the water mist curtain.

[0014] Optionally, one end of the water mist nozzle is closed, and the other end of the water mist nozzle is open and equipped with a pressure relief valve. The water mist nozzle is connected to a high-pressure air duct and a high-pressure water pipe, and both the high-pressure air duct and the high-pressure water pipe are equipped with stop valves. A plurality of water mist nozzles are installed on the water mist nozzle.

[0015] In this scheme, both high-pressure gas and high-pressure liquid enter the water mist nozzle, and the liquid is atomized and sprayed out through the water mist nozzle by mutual squeezing, acceleration or shearing between the gas medium and the liquid medium, thereby forming a high-pressure water curtain particle fog shielding belt, so that the dust falls with the water particles and cannot spread outward. In addition, the setting of the pressure relief valve allows the water mist nozzle to release pressure when the internal pressure is too high, thereby improving the safety of the device.

[0016] Optionally, a one-way valve is also installed on the high-pressure air duct, and the one-way valve is located between the water mist nozzle and the stop valve, and the one-way valve guides the high-pressure air to the water mist nozzle.

[0017] In this solution, the setting of the one-way valve can not only prevent the air flow from flowing back, but also prevent the liquid from entering the high-pressure air duct.

[0018] Optionally, the open end of the water mist nozzle is connected to a discharge pipe, and an end of the discharge pipe away from the water mist nozzle extends to a temporary water pit in the tunnel.

[0019] In this scheme, once the pressure in the water mist nozzle exceeds the opening pressure of the pressure relief valve, the liquid and gas in the water mist nozzle are discharged into a temporary water pit in the tunnel through the discharge pipe to avoid direct discharge of liquid onto the tunnel floor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of a water mist curtain dust suppression device used in tunnel construction in Embodiment 1 of the utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the adjustable support assembly in the first embodiment of the utility model;

[0022] Figure 3 It is a schematic structural diagram of a water mist curtain dust suppression device used for tunnel construction in the second embodiment of the utility model. DETAILED DESCRIPTION

[0023] The following is further described in detail through specific implementation methods:

[0024] The marks in the drawings of the specification include: water mist nozzle 1, pressure relief valve 2, high-pressure air duct 3, high-pressure water pipe 4, stop valve 5, one-way valve 6, water mist nozzle 7, stand body 8, adjustable support assembly 9, fixed cylinder 901, screw 902, adjustment piece 903, U-shaped bracket 904, connecting rod 10, inclined rod 11, caster 12, discharge pipe 13.

[0025] Embodiment 1

[0026] This embodiment is basically Figure 1As shown: a water mist curtain dust suppression device for tunnel construction, comprising a water mist nozzle 1 and a support frame for supporting the water mist nozzle 1, one end of the water mist nozzle 1 is closed, the other end of the water mist nozzle 1 is open and equipped with a pressure relief valve 2, the water mist nozzle 1 is connected with a high-pressure air pipe 3 and a high-pressure water pipe 4, both of which are equipped with a stop valve 5, and a one-way valve 6 is also installed on the high-pressure air pipe 3, the one-way valve 6 is located between the water mist nozzle 1 and the stop valve 5, and the one-way valve 6 guides the high-pressure air to the water mist nozzle 1. A plurality of water mist nozzles 7 are installed on the water mist nozzle 1, and the water mist nozzles 7 located on both sides of the vertical center line of the support frame are symmetrically arranged along the vertical center line of the support frame.

[0027] The support stand includes a stand body 8 and a plurality of adjustable support assemblies 9. In this embodiment, there are six sets of adjustable support assemblies 9, two of which are located at the top of the stand body 8, two of which are located on the left side of the stand body 8, and the remaining two of which are located on the right side of the stand body 8. Figure 2 As shown, the adjustable support assembly 9 includes a fixed cylinder 901, a screw 902, an adjusting member 903 and a U-shaped bracket 904. The fixed cylinder 901 is welded to the stand body 8. The adjusting member 903 is threadedly connected to the screw 902. The adjusting member 903 can abut against one end of the fixed cylinder 901 away from the stand body 8. The U-shaped bracket 904 is welded to the screw 902, and the water mist nozzle 1 can be immersed in the U-shaped bracket 904. Several adjustable support assemblies 9 are symmetrically arranged along the vertical center line of the platform body 8. There are two groups of adjustable support assemblies 9 located at the top of the platform body 8. The two groups of adjustable support assemblies 9 are tilted, and a connecting rod 10 is provided between the fixed cylinders 901 of the two groups of adjustable support assemblies 9, that is, the two ends of the connecting rod 10 are respectively welded to the two tilted fixed cylinders 901, thereby improving the stability of the adjustable support assembly 9 located at the top of the platform body 8; the fixed cylinders 901 in the adjustable support assemblies 9 located on both sides of the platform body 8 are connected to the platform body 8 by an inclined rod 11, that is, one end of the inclined rod 11 is welded to the platform body 8, and the other end of the inclined rod 11 is welded to the corresponding fixed cylinder 901, thereby obliquely supporting the adjustable support assemblies 9 located on both sides of the platform body 8; casters 12 are fixedly installed at the bottom end of the platform body 8, and the casters 12 can move the platform body 8 along the tunnel. In this embodiment, the casters 12 are universal wheels with brakes.

[0028] In actual use, a water mist nozzle 1 matching the tunnel structure is selected so that the water mist nozzle 1 fits the rock wall of the tunnel as closely as possible, thereby making the starting point of the water mist curtain fit the rock wall of the tunnel as closely as possible, reducing or even preventing dust from passing through the gap between the water mist nozzle 1 and the rock wall of the tunnel. The water mist nozzle 1 is supported by a support frame, specifically, the water mist nozzle 1 is sunk into each U-shaped bracket 904.

[0029] The high-pressure air duct 3 is connected to the high-pressure air circuit for tunnel construction through the air inlet hose, and the high-pressure water pipe 4 is connected to the high-pressure water circuit for tunnel construction through the water inlet hose. When the stop valve 5 is opened, both high-pressure water and high-pressure gas enter the water mist nozzle 1. The liquid is atomized and sprayed out through the water mist nozzle 7 by utilizing the mutual extrusion, acceleration or shearing operation between the gas medium and the liquid medium, thereby forming a high-pressure water curtain particle fog shielding belt (water mist curtain), so that the dust cannot diffuse outward as the water particles fall. During the process, when the internal pressure of the water mist nozzle 1 exceeds the opening pressure of the pressure relief valve 2, the liquid and gas in the water mist nozzle 1 are discharged through the open end (left end) of the water mist nozzle 1, so as to avoid the water mist nozzle 1 from exploding due to excessive internal pressure, thereby improving the safety of the device. In addition, when the position of the water mist curtain needs to be adjusted, the stand body 8 is pushed, and the casters 12 are rolled to move the device to a suitable position.

[0030] When the device in this embodiment is transferred to other tunnels, if the current water mist nozzle 1 does not match the tunnel structure, the current water mist nozzle 1 is removed and a new water mist nozzle 1 matching the tunnel structure is installed. Specifically, the adjusting member 903 is rotated so that the adjusting member 903 moves toward the U-shaped bracket 904, so that the U-shaped bracket 904 and the screw 902 can move toward the fixed cylinder 901, so that the U-shaped bracket 904 is separated from the water mist nozzle 1, and the water mist nozzle 1 can be removed. Subsequently, the new water mist nozzle 1 is lifted onto the support stand, and the U-shaped bracket 904 is pulled so that the water mist nozzle 1 is sunk into the U-shaped bracket 904, and then the adjusting member 903 is rotated in the opposite direction so that the adjusting member 903 is close to the fixed cylinder 901 and abuts against the fixed cylinder 901, thereby supporting the water mist nozzle 1.

[0031] To sum up, in this embodiment, the water mist nozzle 1 and the supporting frame are detachable, and the effective supporting length of the adjustable supporting assembly 9 is adjustable, so as to support water mist nozzles 1 of different specifications, avoiding cutting and welding operations when replacing the water mist nozzle 1. The operation is simple, which is conducive to improving construction efficiency and reducing construction costs. The supporting frame can be applied to tunnels of various structures and has good universality.

[0032] Embodiment 2

[0033] The difference between this embodiment and the first embodiment is that: Figure 3 As shown, the open end of the water mist nozzle 1 is connected to a discharge pipe 13, and one end of the discharge pipe 13 away from the water mist nozzle 1 extends to a temporary water pit in the tunnel.

[0034] In this embodiment, when the internal pressure of the water mist nozzle 1 reaches the opening pressure of the pressure relief valve 2, the liquid and gas in the water mist nozzle 1 are discharged into the temporary water accumulation pit of the tunnel through the discharge pipe 13, avoiding the liquid from being directly discharged onto the ground of the tunnel and causing water accumulation on the ground.

[0035] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the utility model. The specific implementation methods and other records in the specification can be used to explain the content of the claims.

Claims

1. A water mist curtain dust suppression device for tunnel construction, comprising a water mist nozzle and a support frame for supporting the water mist nozzle, characterized in that: The support stand includes a stand body and a plurality of adjustable support components, the adjustable support components include a fixed cylinder, a screw, an adjusting piece and a U-shaped bracket, the fixed cylinder is fixedly connected to the stand body, the adjusting piece is threadedly connected to the screw, the adjusting piece can abut against one end of the fixed cylinder away from the stand body, the U-shaped bracket is fixedly connected to the screw, and the water mist nozzle can be sunk into the U-shaped bracket.

2. The water mist curtain dust suppression device for tunnel construction according to claim 1 is characterized in that: A plurality of adjustable support components are symmetrically arranged along the vertical center line of the platform body.

3. The water mist curtain dust suppression device for tunnel construction according to claim 1 or 2, characterized in that: There are two groups of adjustable support components located at the top of the platform body. The two groups of adjustable support components are tilted, and a connecting rod is provided between the fixing cylinders of the two groups of adjustable support components.

4. The water mist curtain dust suppression device for tunnel construction according to claim 1, characterized in that: An oblique rod is provided between the fixing cylinder in the adjustable support assembly located on both sides of the platform body and the platform body.

5. The water mist curtain dust suppression device for tunnel construction according to claim 1, characterized in that: A caster is fixedly mounted on the bottom end of the platform body, and the caster can move the platform body along the tunnel.

6. The water mist curtain dust suppression device for tunnel construction according to claim 1, characterized in that: One end of the water mist nozzle is closed, and the other end is open and equipped with a pressure relief valve. The water mist nozzle is connected to a high-pressure air duct and a high-pressure water pipe, both of which are equipped with stop valves. A plurality of water mist nozzles are installed on the water mist nozzle.

7. The water mist curtain dust suppression device for tunnel construction according to claim 6, characterized in that: A one-way valve is also installed on the high-pressure air duct. The one-way valve is located between the water mist nozzle and the stop valve. The one-way valve guides the high-pressure air to the water mist nozzle.

8. The water mist curtain dust suppression device for tunnel construction according to claim 6, characterized in that: The open end of the water mist nozzle is connected with a discharge pipe, and an end of the discharge pipe away from the water mist nozzle extends to a temporary water accumulation pit in the tunnel.

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