An environmentally friendly dust removal process for cable tunnel construction

Abstract

The invention discloses an environmentally friendly dust removal process for cable tunnel construction, wherein the dust extracted from the tunnel is removed by a dust removal and demisting unit and then the gas is discharged; the upper and lower ends of each third baffle plate are respectively connected to the upper inner wall and the lower inner wall of the second muffler box, and the rear end of each third baffle plate is connected to the rear end inner wall of the second muffler box; a fourth baffle plate is arranged between each two adjacent third baffle plates, and the upper and lower ends of each fourth baffle plate are respectively connected to the upper inner wall and the lower inner wall of the second muffler box, and the front end of each fourth baffle plate is connected to the front end inner wall of the second muffler box; the two ends of the dust removal and demisting box are respectively provided with an air inlet end and an air outlet end, and the liquid generated in the dust removal and demisting unit is recycled through a circulation connection unit. The invention has the advantages of improving the dust removal effect, improving the construction environment, and avoiding the situation that the dust removal effect is reduced due to blockage and the shutdown is caused to affect the construction efficiency.

Description

Technical Field

[0001] The invention relates to an environmental protection process, and in particular to an environmental protection dust removal process for cable tunnel construction. Background Art

[0002] Compared with cable trenches, jacking pipes and other cable laying methods, cable tunnels have obvious advantages in many aspects. For example, cable tunnels can greatly reduce the road section occupied by cable lines, reduce external force damage and mechanical damage to cables, eliminate chemical corrosion of harmful substances in the soil to the cable protective layer, make maintenance or replacement faster and more convenient, and allow new cables to be added without damage. However, existing cable tunnels are usually built in the city center, so there are the following problems in specific construction:

[0003] 1) A large amount of dust will be generated during the construction of the cable tunnel. If it is not properly ventilated and dust-removed, it will not only endanger human health, but also pollute the environment. Although there are some dust removal devices in the prior art, for the use environment with a large amount of dust, the gas discharged after the dust removal by the existing dust removal equipment cannot completely achieve the dust removal effect. At the same time, after a certain period of dust removal, the dust removal effect becomes poor because it cannot be cleaned during operation. Stopping the machine for cleaning will delay the construction efficiency.

[0004] 2) Too high dust concentration will affect visibility, making it difficult for construction workers to see the surrounding construction environment, and causing accidents due to deviations in movement and operational errors. Dust spreads to mechanical parts, causing mechanical wear, increasing maintenance costs, and affecting the progress of construction.

[0005] 3) Cable tunnel construction sites are usually close to residential areas, thus causing noise pollution to sensitive surrounding areas.

[0006] 4) Wastewater (including construction wastewater, rock foundation fissure water and spray dust reduction wastewater, etc.) will be generated during the construction process. The water body has high turbidity and is generally alkaline. If this type of construction wastewater is directly discharged into the urban pipeline network or the surrounding environment without treatment, it will inevitably cause pipeline blockage and environmental pollution.

[0007] Therefore, those skilled in the art are committed to providing an environmentally friendly dust removal process that can effectively solve the cable tunnel construction problem. Summary of the invention

[0008] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide an environmentally friendly dust removal process that can effectively solve the problem of cable tunnel construction.

[0009] To achieve the above object, the present invention provides an environmentally friendly dust removal process for cable tunnel construction, comprising the following steps:

[0010] S1: The dust extracted from the tunnel is removed by a dust removal and mist removal unit and then the gas is discharged;

[0011] The dust removal and demisting unit comprises a dust removal and demisting box, and dust is sent into the dust removal and demisting box through an exhaust unit; dust is removed by a packing unit and a spray mechanism arranged in the dust removal and demisting box;

[0012] The exhaust unit includes a first muffler unit and a second muffler unit arranged on both sides of the exhaust unit; a sound insulation layer is arranged on the outer wall of the exhaust unit; the first muffler unit includes a first muffler box, an air inlet pipe connected to the first muffler box is arranged on the first muffler box, and a plurality of first drain ports are arranged at the bottom of the first muffler box;

[0013] A plurality of first baffle plates are arranged in the first muffler box, and the upper and lower ends of each of the first baffle plates are respectively connected to the upper inner wall and the lower inner wall of the first muffler box, and the rear end of each of the first baffle plates is connected to the rear end inner wall of the first muffler box; a second baffle plate is arranged between each two adjacent first baffle plates, and the upper and lower ends of each of the second baffle plates are respectively connected to the upper inner wall and the lower inner wall of the first muffler box, and the front end of each of the second baffle plates is connected to the front end inner wall of the first muffler box; a first spray unit is arranged on the top of the first muffler box;

[0014] The second muffler unit comprises a second muffler box, an air outlet pipe is arranged at the rear end of the second muffler box, a plurality of third baffle plates are arranged in the second muffler box, the upper and lower ends of each of the third baffle plates are respectively connected to the upper inner wall and the lower inner wall of the second muffler box, and the rear end of each of the third baffle plates is connected to the rear end inner wall of the second muffler box; a fourth baffle plate is arranged between each two adjacent third baffle plates, the upper and lower ends of each of the fourth baffle plates are respectively connected to the upper inner wall and the lower inner wall of the second muffler box, and the front end of each of the fourth baffle plates is connected to the front end inner wall of the second muffler box; the two ends of the dust removal and demisting box are respectively provided with an air inlet end and an air outlet end,

[0015] S2: At the same time, the liquid produced in the dust removal and demisting unit is circulated through the circulation connection unit.

[0016] Preferably, the air inlet end is connected to the air exhaust unit through a connecting pipe; the spray mechanism includes a secondary dust removal nozzle and a perforated nozzle;

[0017] A plurality of first dust removal areas are arranged in intervals in the dust removal and demisting box, each of the first dust removal areas is provided with a first isolation head plate and a first isolation tail plate, both sides and the upper end of the first isolation head plate are connected to the inner wall of the dust removal and demisting box, the lower end of the first isolation head plate is arranged at intervals with the bottom end of the dust removal and demisting box, both sides of the first isolation tail plate are connected to the inner wall of the dust removal and demisting box, and the upper and lower ends of the first isolation tail plate are arranged at intervals with the upper and lower ends of the dust removal and demisting box respectively;

[0018] A first stuffing box and a plurality of secondary dust removal nozzles are arranged in each of the first dust removal areas, each of the secondary dust removal nozzles is arranged at the upper end of the dust removal and demisting box body, and the first stuffing box is connected to the dust removal and demisting box body and is located directly below the secondary dust removal nozzles;

[0019] A second dust removal area and a third dust removal area are arranged in the dust removal and demisting box at intervals, the second dust removal area is located between the first dust removal area and the third dust removal area, the second dust removal area is provided with a second isolation head plate and a second isolation tail plate, both sides and the upper end of the second isolation head plate are connected to the inner wall of the dust removal and demisting box, the lower end of the second isolation head plate is arranged at intervals with the bottom end of the dust removal and demisting box, both sides of the second isolation tail plate are connected to the inner wall of the dust removal and demisting box, and the upper and lower ends of the second isolation tail plate are respectively arranged at intervals with the upper and lower ends of the dust removal and demisting box; a perforated nozzle and a second stuffing box are arranged in the second dust removal area, each of the perforated nozzle and the second stuffing box is simultaneously connected to the second isolation head plate and the second isolation tail plate, and the second stuffing box is located directly below the perforated nozzle;

[0020] The third dust removal area is provided with a third isolation head plate and a third isolation tail plate, both sides and the upper end of the third isolation head plate are connected to the inner wall of the dust removal and demisting box body, the lower end of the third isolation head plate is spaced apart from the bottom end of the dust removal and demisting box body, both sides of the third isolation tail plate are connected to the inner wall of the dust removal and demisting box body, and the upper and lower ends of the third isolation tail plate are spaced apart from the upper and lower ends of the dust removal and demisting box body respectively; a third stuffing box is provided in the third dust removal area, and stuffing is provided in the first stuffing box, the second stuffing box and the third stuffing box;

[0021] A condensation unit is disposed between two adjacent first dust removal zones, and a condensation unit is also disposed between the second dust removal zone and the first dust removal zone and the third dust removal zone;

[0022] The condensation unit includes a plurality of inclined plates respectively connected to the first isolation head plate, the first isolation tail plate, the second isolation head plate, the second isolation tail plate and the third isolation head plate. Two adjacent inclined plates form a group. The openings of the two inclined plates in each group gradually become smaller from top to bottom. A diamond-shaped piece connected to the dust and demisting box is arranged below the two inclined plates in each group, and ventilation ducts are formed on both sides of the diamond-shaped piece.

[0023] Preferably, the exhaust unit comprises a pipe, a fan is arranged in the pipe, the input end and the output end of the pipe are respectively connected to the first muffler box and the second muffler box; the input end of the pipe is detachably connected to the first muffler box, and the output end of the pipe is detachably connected to the second muffler box; the input end of the pipe is arranged obliquely higher than the output end; the sound insulation layer is sound-absorbing cotton, and the sound-absorbing cotton is arranged on the outer wall of the pipe;

[0024] The first spray unit includes a first water inlet pipe arranged at the top of the first muffler box, a plurality of first nozzles are arranged on the first water inlet pipe, each of the first nozzles extends into the first muffler box and is connected to the upper inner wall of the first muffler box; the first nozzles are arranged on both sides of each of the first baffle plates; a mounting groove is arranged at the top of the first muffler box, the first water inlet pipe is arranged in the mounting groove, a plurality of positioning columns are arranged in the mounting groove, the top plate is located above the first water inlet pipe, and is detachably connected to the first muffler box through each of the positioning columns;

[0025] A plurality of first drainage outlets are arranged on both sides of the first baffle plate and the second baffle plate, and a plurality of first drainage grooves used in conjunction with the first drainage outlets are arranged at the bottom of the first silencer box body, and the water outlet end of each first drainage groove is connected to a water collecting box, and a water outlet is arranged on the water collecting box.

[0026] Preferably, the front half of the second muffler box is a spraying area, and a second spraying unit is arranged in the spraying area. The second spraying unit includes a plurality of second spray heads, and the input end of each second spray head extends upward through the second muffler box and is connected to the second water inlet pipe;

[0027] A plurality of second drain outlets are arranged in the second muffler box, and a second drain trough for use with the second drain outlet is arranged at the lower end of the second muffler box, and the water outlet end of the second drain trough is connected to the water collecting tank; the first muffler box and the second muffler box are both provided with guide grooves, and two adjacent first drain outlets and two adjacent second drain outlets are connected through each of the guide grooves.

[0028] Preferably, the circulation connection unit includes a first water delivery pipe and a second water delivery pipe, the lower half of the dust removal and demisting box is connected to each of the secondary dust removal nozzles through the first water delivery pipe, the water inlet end of the perforated nozzle is connected to the water outlet end of the second water delivery pipe, the water inlet end of the second water delivery pipe is simultaneously connected to the lower half of the dust removal and demisting box and the external pipe, the first water delivery pipe and the second water delivery pipe are both provided with water pumps; the first water delivery pipe and the second water delivery pipe are both provided with valves for closing or opening the first water delivery pipe and the second water delivery pipe; the perforated nozzle includes a perforated main pipe and a plurality of perforated sub-pipes, the perforated main pipe is detachably connected to the second isolation head plate and the second isolation tail plate, and is connected to the second water delivery pipe, and the water inlet end of each of the perforated sub-pipes is connected to the perforated main pipe.

[0029] Preferably, a self-cleaning unit is provided at the air outlet end, and the air is discharged after being dusted by the dust removal and demisting unit and then entering the self-cleaning unit for self-cleaning and dust removal;

[0030] The self-cleaning unit comprises an outer box body, the front end of the outer box body is provided with an air inlet, which is connected to the air outlet, the rear end of the outer box body is provided with an air outlet, and a rear cover is provided at the air outlet;

[0031] An inner cylinder is arranged in the outer box body, and a plurality of air outlet holes are opened along the length direction of the inner cylinder. An extension cylinder penetrating the inner cylinder is arranged at the front end of the inner cylinder, and the front end of the extension cylinder extends out of the outer box body through the air inlet. Two connecting pieces are arranged in the outer box body, and the rear half of the inner cylinder and the front half of the extension cylinder are respectively connected to the inner wall of the outer box body through the connecting pieces;

[0032] The inner wall of the front half of the extension tube is provided with a plurality of air inlet nozzles, and the outer box is provided with a filter cover, which is rotatably sleeved on the inner tube, and each of the air outlet holes is located in the filter cover;

[0033] The bottom of the outer box is provided with a sewage outlet.

[0034] Preferably, the specific method of dust removal in the self-cleaning unit is to pour water into the outer box until the lower end of the filter cover contacts with the water, so as to facilitate the cleaning of the filter cover when it rotates. The gas containing dust is sent into the inner cylinder through the fan, and the dust is humidified by the air inlet nozzle when passing through the extension cylinder. After the humidified dust enters the inner cylinder together with the gas, it enters between the inner cylinder and the filter cover through the air outlet. At this time, the gas is blown onto the filter cover to drive the filter cover to rotate. At the same time, the gas passes through the filter cover, and the humidified dust is attached to the filter cover. When the rotating filter cover contacts with the water located in the outer box 1, the dust attached to the filter cover is cleaned, and the gas is discharged through the rear cover.

[0035] Preferably, the air outlet holes are arranged in a spiral array along the length direction of the inner tube; the connecting member includes a plurality of connecting rods, and the connecting rods are arranged in a circular array around the center line of the inner tube.

[0036] Preferably, a water supply pipe is provided on the outer wall of the front half of the extension tube, each of the air inlet nozzles is connected to the water outlet end of the water supply pipe, and the water inlet end of the water supply pipe is connected to the external pipe; a plurality of guide plates are provided between the filter cover and the inner tube, one end of each of the guide plates is connected to the inner wall of the filter cover, and the other end of each of the guide plates is spaced apart from the inner tube.

[0037] Preferably, the rear cover comprises a horn section and a straight connecting section, the cross-section of the horn section gradually decreases from the front end to the rear end, and the rear end of the horn section is connected to the front end of the straight connecting section; an overflow pipe is provided on one side of the outer box body.

[0038] The beneficial effects of the present invention are as follows: on the one hand, the present invention reduces dust during the cable tunnel construction process, avoiding harm to the health of operators, and at the same time, due to the reduction of dust, the number of machine maintenance times is reduced, not only the maintenance cost is reduced, but also the maintenance of the machine is avoided to affect the construction progress; on the other hand, by reducing the dust concentration, the construction environment is improved, the visibility is improved, and accidents caused by poor vision are avoided; in addition, noise can be reduced and construction wastewater can be avoided from causing pipe network blockage and environmental pollution; and the structure of the present invention realizes step-by-step dust removal, and the treatment effect for large dust quantities is particularly obvious. At the same time, it cooperates with the self-cleaning unit for automatic cleaning to avoid blockage and reduce the dust removal effect, and there is no need to stop the machine for treatment, thereby improving the dust removal and construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a specific structural schematic diagram of the dust removal and demisting unit in the present invention.

[0040] Figure 2 yes Figure 1 Schematic diagram of the local enlarged structure at point A in the middle.

[0041] Figure 3 It is a structural schematic diagram of the coordinated use of the exhaust unit with the first silencer unit, the second silencer unit and other components in the present invention.

[0042] Figure 4 It is a structural schematic diagram of the first muffler unit in the present invention.

[0043] Figure 5 It is a schematic structural diagram of the second muffler unit in the present invention.

[0044] Figure 6 It is a structural schematic diagram of the first baffle plate and other components being arranged in the first muffler box.

[0045] Figure 7 yes Figure 6 Schematic diagram of the local enlarged structure at point B in the middle.

[0046] Figure 8 It is a schematic diagram of a top view of the structure in which the first baffle plate and the second baffle plate are arranged in the first muffler box.

[0047] Fig. 9 It is a schematic diagram of the three-dimensional structure in which the third baffle plate and the fourth baffle plate are arranged in the second muffler box.

[0048] Fig.10 It is a schematic diagram of a top view of the structure in which the third baffle plate and the fourth baffle plate are arranged in the second muffler box.

[0049] Fig.11 It is a structural schematic diagram of a self-cleaning unit.

[0050] Fig.12 It is another three-dimensional structural schematic diagram of the self-cleaning unit.

[0051] Fig.13 Schematic diagram of the structure in which the outer box is not provided in the self-cleaning unit.

[0052] Fig.14 It is a structural schematic diagram of a self-cleaning unit in which a plurality of air outlet holes are provided on the inner cylinder.

[0053] Fig.15 It is a structural schematic diagram of the cooperation between the filter cover and the outer box in the self-cleaning unit.

[0054] Fig.16 It is a structural schematic diagram of a guide vane provided in a filter cover of a self-cleaning unit. DETAILED DESCRIPTION

[0055] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0056] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0057] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "setting", 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.

[0058] like Figures 1 to 16 As shown, an environmentally friendly dust removal process for cable tunnel construction includes the following steps:

[0059] S1: The dust extracted from the tunnel is removed by the dust removal and mist removal unit 1 and then the gas is discharged;

[0060] The dust removal and demisting unit 1 includes a dust removal and demisting box 2, and dust is sent into the dust removal and demisting box 2 through an exhaust unit 60; dust is removed by a packing unit and a spray mechanism arranged in the dust removal and demisting box 2;

[0061] The exhaust unit 60 includes a first muffler unit 61 and a second muffler unit 62 arranged on both sides of the exhaust unit 60; a sound insulation layer is arranged on the outer wall of the exhaust unit 60; the first muffler unit 61 includes a first muffler box 63, an air inlet pipe 65 connected to the first muffler box 63 is arranged on the first muffler box 63, and a plurality of first drain ports 66 are arranged at the bottom of the first muffler box 63;

[0062] A plurality of first baffle plates 67 are arranged in the first muffler box 63, and the upper and lower ends of each of the first baffle plates 67 are respectively connected to the upper inner wall and the lower inner wall of the first muffler box 63, and the rear end of each of the first baffle plates 67 is connected to the rear end inner wall of the first muffler box 63; a second baffle plate 68 is arranged between each two adjacent first baffle plates 67, and the upper and lower ends of each of the second baffle plates 68 are respectively connected to the upper inner wall and the lower inner wall of the first muffler box 63, and the front end of each of the second baffle plates 68 is connected to the front end inner wall of the first muffler box 63; a first spray unit 69 is arranged on the top of the first muffler box 63;

[0063] The second muffler unit 62 includes a second muffler box 70, a rear end of the second muffler box 70 is provided with an air outlet pipe 71, a plurality of third baffle plates 72 are provided in the second muffler box 70, the upper and lower ends of each of the third baffle plates 72 are respectively connected to the upper inner wall and the lower inner wall of the second muffler box 70, and the rear end of each of the third baffle plates 72 is connected to the rear end inner wall of the second muffler box 70; a fourth baffle plate 73 is provided between each adjacent two third baffle plates 72, the upper and lower ends of each of the fourth baffle plates 73 are respectively connected to the upper inner wall and the lower inner wall of the second muffler box 70, and the front end of each of the fourth baffle plates 73 is connected to the front end inner wall of the second muffler box 70; the two ends of the dust removal and demisting box 2 are respectively provided with an air inlet end 3 and an air outlet end 5,

[0064] S2: At the same time, the liquid generated in the dust removal and demisting unit 1 is circulated and reused through the circulation connection unit.

[0065] The air inlet end 3 is connected to the exhaust unit 60 through a connecting pipe; the spray mechanism includes a secondary dust removal nozzle 6 and a perforated nozzle 7;

[0066] A plurality of first dust removal areas 8 are arranged in intervals in the dust removal and demisting box 2, and each of the first dust removal areas 8 is provided with a first isolation head plate 9 and a first isolation tail plate 10, both sides and the upper end of the first isolation head plate 9 are connected to the inner wall of the dust removal and demisting box 2, the lower end of the first isolation head plate 9 is arranged at intervals with the bottom end of the dust removal and demisting box 2, both sides of the first isolation tail plate 10 are connected to the inner wall of the dust removal and demisting box 2, and the upper and lower ends of the first isolation tail plate 10 are arranged at intervals with the upper and lower ends of the dust removal and demisting box 2 respectively;

[0067] A first stuffing box 11 and a plurality of secondary dust removal nozzles 6 are provided in each of the first dust removal areas 8. Each of the secondary dust removal nozzles 6 is provided at the upper end of the dust removal and demisting box body 2. The first stuffing box 11 is connected to the dust removal and demisting box body 2 and is located directly below the secondary dust removal nozzles 6.

[0068] The dust removal and demisting box body 2 is provided with a second dust removal area 12 and a third dust removal area 13 at intervals, the second dust removal area 12 is located between the first dust removal area 8 and the third dust removal area 13, the second dust removal area 12 is provided with a second isolation head plate 15 and a second isolation tail plate 16, both sides and the upper end of the second isolation head plate 15 are connected to the inner wall of the dust removal and demisting box body 2, the lower end of the second isolation head plate 15 is spaced apart from the bottom end of the dust removal and demisting box body 2, both sides of the second isolation tail plate 16 are connected to the inner wall of the dust removal and demisting box body 2, and the upper and lower ends of the second isolation tail plate 16 are spaced apart from the upper and lower ends of the dust removal and demisting box body 2 respectively; a perforated nozzle 7 and a second stuffing box 17 are provided in the second dust removal area 12, each of the perforated nozzle 7 and the second stuffing box 17 are simultaneously connected to the second isolation head plate 15 and the second isolation tail plate 16, and the second stuffing box 17 is located directly below the perforated nozzle 7;

[0069] The third dust removal zone 13 is provided with a third isolation head plate 18 and a third isolation tail plate 19, both sides and the upper end of the third isolation head plate 18 are connected to the inner wall of the dust removal and demisting box body 2, the lower end of the third isolation head plate 18 is spaced apart from the bottom end of the dust removal and demisting box body 2, both sides of the third isolation tail plate 19 are connected to the inner wall of the dust removal and demisting box body 2, and the upper and lower ends of the third isolation tail plate 19 are spaced apart from the upper and lower ends of the dust removal and demisting box body 2 respectively; a third stuffing box 20 is provided in the third dust removal zone 13, and stuffing is provided in the first stuffing box 11, the second stuffing box 17 and the third stuffing box 20;

[0070] A condensation unit 200 is disposed between two adjacent first dust removal zones 8, and a condensation unit 200 is also disposed between the second dust removal zone 12 and the first dust removal zone 8 and the third dust removal zone 13;

[0071] The condensation unit 200 includes a plurality of inclined plates 201 respectively connected to the first isolation head plate 9, the first isolation tail plate 10, the second isolation head plate 15, the second isolation tail plate 16 and the third isolation head plate 18. Two adjacent inclined plates 201 form a group. The openings of the two inclined plates 201 of each group gradually become smaller from top to bottom. A diamond-shaped piece 202 connected to the dust removal and demisting box 2 is arranged below the two inclined plates 201 of each group, and ventilation ducts 203 are formed on both sides of the diamond-shaped piece 202.

[0072] The exhaust unit 60 includes a pipe 75, in which a fan is arranged, and the input end and the output end of the pipe 75 are respectively connected to the first muffler box 63 and the second muffler box 70; the input end of the pipe 75 is detachably connected to the first muffler box 63, and the output end of the pipe 75 is detachably connected to the second muffler box 70; the input end of the pipe 75 is arranged obliquely higher than the output end; the sound insulation layer is sound-absorbing cotton, and the sound-absorbing cotton is arranged on the outer wall of the pipe 75;

[0073] The first spray unit 69 includes a first water inlet pipe 76 arranged at the top of the first muffler box 63, and a plurality of first nozzles 77 are arranged on the first water inlet pipe 76, each of which extends into the first muffler box 63 and is connected to the upper inner wall of the first muffler box 63; the first nozzles 77 are arranged on both sides of each first baffle plate 67; a mounting groove 78 is arranged at the top of the first muffler box 63, the first water inlet pipe 76 is arranged in the mounting groove 78, and a plurality of positioning columns 79 are arranged in the mounting groove 78, and the top plate 80 is located above the first water inlet pipe 76, and is detachably connected to the first muffler box 63 through each of the positioning columns 79;

[0074] A plurality of first drain outlets 66 are provided on both sides of the first baffle plate 67 and the second baffle plate 68, and a plurality of first drain grooves 81 used in conjunction with the first drain outlets 66 are provided at the bottom of the first silencer box 63, and the water outlet end of each first drain groove 81 is connected to a water collecting box 82, and a water outlet is provided on the water collecting box 82.

[0075] The front half of the second muffler box 70 is a spraying area 83, and a second spraying unit 86 is disposed in the spraying area 83. The second spraying unit 86 includes a plurality of second spray heads 87. The input end of each second spray head 87 extends upward through the second muffler box 70 and is connected to the second water inlet pipe 90.

[0076] A plurality of second drain outlets 91 are arranged in the second silencer box 70, and a second drain groove 92 used in conjunction with the second drain outlet 91 is arranged at the lower end of the second silencer box 70, and the water outlet end of the second drain groove 92 is connected to the water collecting tank 82; the first silencer box 63 and the second silencer box 70 are both provided with a guide groove 93, and two adjacent first drain outlets 66 and two adjacent second drain outlets 91 are connected through each of the guide grooves 93.

[0077] The circulating connection unit includes a first water delivery pipe and a second water delivery pipe. The lower half of the dust removal and demisting box 2 is connected to each of the secondary dust removal nozzles 6 through the first water delivery pipe. The water inlet end of the perforated nozzle 7 is connected to the water outlet end of the second water delivery pipe. The water inlet end of the second water delivery pipe is simultaneously connected to the lower half of the dust removal and demisting box 2 and the external pipe. The first water delivery pipe and the second water delivery pipe are both provided with water pumps; the first water delivery pipe and the second water delivery pipe are both provided with valves for closing or opening the first water delivery pipe and the second water delivery pipe; the perforated nozzle 7 includes a perforated main pipe 22 and a plurality of perforated sub-pipes 23. The perforated main pipe 22 is detachably connected to the second isolation head plate 15 and the second isolation tail plate 16, and is connected to the second water delivery pipe. The water inlet end of each perforated sub-pipe 23 is connected to the perforated main pipe 22.

[0078] The air outlet 5 is provided with a self-cleaning unit, and after being dusted by the dust removal and demisting unit 1, the air enters the self-cleaning unit for self-cleaning and dust removal before being discharged; the self-cleaning unit comprises an outer box 100, and an air inlet 102 is provided at the front end of the outer box 100, and is connected to the air outlet 5 through 102, and an air outlet 103 is provided at the rear end of the outer box 100, and a rear cover 105 is provided at the air outlet 103;

[0079] An inner cylinder 106 is provided in the outer box 100, and a plurality of air outlet holes 107 are provided along the length direction of the inner cylinder 106. An extension cylinder 108 penetrating the inner cylinder 106 is provided at the front end of the inner cylinder 106, and the front end of the extension cylinder 108 extends out of the outer box 100 through the air inlet 102. Two connecting pieces 109 are provided in the outer box 100, and the rear half of the inner cylinder 106 and the front half of the extension cylinder 108 are respectively connected to the inner wall of the outer box 100 through the connecting pieces 109;

[0080] The inner wall of the front half of the extension tube 108 is provided with a plurality of air inlet nozzles 130, and the outer box body 100 is provided with a filter cover 131, and the filter cover 131 is rotatably sleeved on the inner tube 106, and each of the air outlet holes 107 is located in the filter cover 131;

[0081] The bottom of the outer box body 100 is provided with a sewage outlet 132 . The specific method for dust removal in the self-cleaning unit is to pour water 99 into the outer box body 100 until the lower end of the filter cover 131 contacts with the water 99, so as to facilitate the cleaning of the filter cover 131 when it rotates. The gas containing dust is sent into the inner cylinder 106 through the fan, and when passing through the extension cylinder 108, the dust is humidified by the air inlet nozzle 130. After the humidified dust enters the inner cylinder 106 together with the gas, it enters between the inner cylinder 106 and the filter cover 131 through the air outlet 107. At this time, the gas is blown onto the filter cover 131 to drive the filter cover 131 to rotate. At the same time, the gas passes through the filter cover 131, and the humidified dust is attached to the filter cover 131. When the rotating filter cover 131 contacts with the water located in the outer box body 1, the dust attached to the filter cover 131 is cleaned, and the gas is discharged through the rear cover 105.

[0082] The air outlet holes 107 are arranged in a spiral array along the length direction of the inner tube 106 ; the connecting member 109 includes a plurality of connecting rods 152 , and the connecting rods 152 are arranged in a circular array around the center line of the inner tube 106 .

[0083] The outer wall of the front half of the extension tube 108 is provided with a water supply pipe 151, each of the air inlet nozzles 130 is connected to the water outlet end of the water supply pipe 151, and the water inlet end of the water supply pipe 151 is connected to the external pipe; a plurality of guide vanes 153 are provided between the filter cover 131 and the inner tube 106, and in the present invention, the number of the guide vanes 16 is three, and the three guide vanes are arranged in a circular array around the center line of the inner tube. One end of each of the guide vanes 153 is connected to the inner wall of the filter cover 131, and the other end of each of the guide vanes 153 is arranged at intervals with the inner tube 106. The rear cover 105 includes a horn section 155 and a straight connecting section 156, and the cross section of the horn section 155 gradually decreases from the front end to the rear end, and the rear end of the horn section 155 is connected to the front end of the straight connecting section 156; an overflow pipe 157 is provided on one side of the outer box 100. The advantage of setting the overflow pipe 157 is that when in use, the dusty gas enters the outer box body 100 through the extension tube 108 (the air intake speed reaches 20-30 meters per second, avoiding the wind speed being too fast and affecting the service life of the filter cover 131, and avoiding the wind speed being too slow and affecting the rotation of the filter cover 131); the dust will be humidified through the tuyere nozzle 130. In this process, as the gas flows into the outer box body 100, part of the water sprayed by the tuyere nozzle 130 will be humidified. To the outer box body 100, the water and the humidified dust will fall into the bottom of the outer box body 100, thereby raising the water level in the outer box body 100. In order not to affect the rotation of the filter cover 131 driven by the gas blown out of the air outlet 107, the operator will discharge the water in the outer box body 1 at regular intervals. After the overflow pipe 157 is provided, when the water level rises to the overflow pipe 157, it will be automatically discharged. The operator does not need to drain the water in the outer box body 1 at regular intervals, thereby further reducing the labor intensity of the operator.

[0084] When the self-cleaning unit is in use, 99% water is poured into the outer box 100. Fig.15 Where H is the height of the water level. Fig.15106), until the lower end of the filter cover 131 contacts with the water 99 (it can be slightly higher, but must be lower than the inner cylinder 106), so as to facilitate the cleaning of the filter cover 131 when it rotates, and the gas with dust is sent into the inner cylinder 106 through the fan, and when passing through the extension cylinder 108, the dust is humidified by the air outlet nozzle 130, and the humidified dust enters the inner cylinder 106 together with the gas, and then enters between the inner cylinder 106 and the filter cover 131 through the air outlet 107. At this time, the gas is blown onto the filter cover 131 to drive the filter cover 131 to rotate, and the gas passes through the filter cover 131 at the same time, and the humidified dust is attached to the filter cover 131, and when the rotating filter cover 131 contacts with the water in the outer box 100, the dust attached to the filter cover 131 is cleaned, and the gas is discharged through the rear cover 105. The present invention can be provided with multiple or single ones according to actual needs.

[0085] In addition, after the gas passes through the filter cover 131, the gas in the lower half of the outer box 100 will contact the water, thereby causing the water in the outer box 100 to fluctuate. When the filter cover 131 contacts the fluctuating water, the cleaning effect of the filter cover 131 is further improved. At the same time, the distance between the inner wall of the filter cover 131 and the inner cylinder 106 can also be increased or decreased according to actual conditions.

[0086] Through systematic research on the generation process and elimination technology of environmental pollution in the mechanized construction of cable tunnels, an intensive environmental protection technology system that matches the mechanized construction of cable tunnels is formed to ensure that noise, dust, wastewater, etc. are consistently up to standard, reduce the footprint of the tunnel construction environmental protection system, reduce the energy and material consumption of system operation, ensure the standardization and safety of the construction site, and realize "green construction" for cable tunnel projects.

[0087] In the present invention, the specific method of using the exhaust unit 60 in conjunction with the first silencer unit 61 and the second silencer unit 62 is as follows: when in use, the gas containing dust is transported to the first silencer unit 61 through the air inlet pipe 65. Since the first baffle plate 67 and the second baffle plate 68 are staggered at intervals, the gas flow rate entering the first silencer unit 61 is reduced, so that the airflow noise is reduced. At the same time, water mist is sprayed through each first nozzle 77 to remove dust. At the same time, water is discharged from the first silencer unit 61 through the first drain port 66. The discharged water enters the water collecting box 82 through the first drain groove 81. The gas after noise reduction and dust removal in the first silencer unit 61 enters the second silencer unit 62 through the exhaust unit 60. The gas entering the second silencer unit 62 reduces the gas flow rate through the staggered third baffle plates 72 and the fourth baffle plates 73 to reduce noise. At the same time, the second nozzle 87 arranged on the spray area 83 is sprayed again for dust removal, and finally discharged through the air outlet pipe 71.

[0088] When the gas passes through the first muffler box 63 and the second muffler box 70, the first baffle plate 67, the second baffle plate 68, the third baffle plate 72 and the fourth baffle plate 73 arranged in the first muffler box 63 and the second muffler box 70 reduce the airflow speed to reduce the airflow noise.

[0089] Dust is removed by spraying through the first nozzle 77 and the second nozzle 87. At the same time, the dust adsorbed on the first baffle plate 67, the second baffle plate 68, the third baffle plate 72 and the fourth baffle plate 73 can also be washed by the first nozzle 77 and the second nozzle 87 to prevent the dust from being adsorbed on the first baffle plate 67, the second baffle plate 68, the third baffle plate 72 and the fourth baffle plate 73. In order to prevent the airflow from driving the water mist to flow out of the air outlet pipe 71, the present invention provides a spray area 83 in the second muffler unit 62, and the position of the spray area 83 is set in the front half of the second muffler box 70, so that after the dust is removed by the second nozzle 87 set at the spray area 83, the second half of the second muffler unit 62 is no longer sprayed, and the third baffle plate 72 and the fourth baffle plate 73 set in the second half of the second muffler unit 62 play a role of blocking and demisting the sprayed water mist, thereby preventing the airflow from driving the water mist to spray out of the air outlet pipe 71.

[0090] Through the specific structural setting of the exhaust unit 60, before the dust is sent into the dust removal and demisting box 2 through the exhaust unit 60, the exhaust unit can also perform dust removal once, thereby further improving the dust removal effect. Through the structure of the present invention, the treatment effect is particularly obvious for a large amount of dust.

[0091] At the same time, the present invention also has the following beneficial effects:

[0092] (1) Social benefits

[0093] At present, mechanized cable tunnel construction is still a relatively new technology with a certain threshold, and the standard requirements, technical processes, solutions, etc. related to environmental pollution control are very lacking. The technical solution of the present invention is conducive to promoting the standardized setting and operation of environmental pollution control systems for similar projects, and is conducive to changing the inherent impression that engineering construction is dirty and messy, forming a significant word-of-mouth effect and social reputation. While reducing the cost of land use, it also reduces the damage to the surrounding ecological environment and municipal infrastructure. It effectively avoids the adverse effects of construction on the surrounding personnel groups and ensures harmonious construction.

[0094] (2) Economic Benefits

[0095] The use of scientific and reasonable intensive environmental protection technologies and facilities can effectively achieve the goal of "four savings and one environmental protection" (energy saving, land saving, water saving, material saving, and environmental protection), effectively reduce the construction investment and operating costs of tunnel construction projects, and meet the corresponding requirements of green construction.

[0096] In addition, the research results of the present invention can be output to similar engineering projects through various forms such as process use, technical guidance, and system solutions, thereby generating direct economic benefits.

[0097] For a single cable tunnel construction project, the implementation of the present invention can reduce the floor space of environmental pollution control facilities by more than 60% (from more than 100 square meters to less than 40 square meters), and reduce the system operation cost by more than 20%. Direct output to similar projects through technical services, overall solution solutions, etc. can create direct economic benefits.

[0098] (3) Ecological and environmental benefits

[0099] The use of the present invention can ensure that various indicators such as dust, wastewater, sludge, noise, etc. stably meet the requirements of current environmental protection standards, avoid the environmental risks faced by cable tunnel construction, and have significant ecological and environmental benefits.

[0100] (4) Sustainable development benefits

[0101] In the present invention, environmental protection facilities can be continuously optimized and designed through overall technology upgrades, core unit optimization, information technology superposition, etc., to achieve more efficient operation, more convenient maintenance, and more timely supervision, which has significant sustainable development benefits.

[0102] (5) Project benefits

[0103] Through the present invention, the dust, noise and wastewater generated by the mechanized construction of the cable tunnel can stably meet the requirements of relevant standards. The implementation of the present invention creates conditions for continuous construction day and night and increases the window period for construction.

[0104] (6) Demonstration effect

[0105] The present invention realizes the standardized configuration of the environmental pollution control system for cable tunnel construction, changes the inherent impression of the construction site being dirty and messy, and forms a good demonstration effect.

[0106] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. An environmentally friendly dust removal process for cable tunnel construction, characterized in that: The following steps are involved: S1: The dust extracted from the tunnel is removed by a dust removal and mist removal unit (1) and then the gas is discharged; The dust removal and demisting unit (1) comprises a dust removal and demisting box (2), and dust is sent into the dust removal and demisting box (2) through an exhaust unit (60); dust is removed by the cooperation of a filler unit and a spray mechanism arranged in the dust removal and demisting box (2); The exhaust unit (60) comprises a first sound-absorbing unit (61) and a second sound-absorbing unit (62) arranged on both sides of the exhaust unit (60); an outer wall of the exhaust unit (60) is provided with a sound insulation layer; the first sound-absorbing unit (61) comprises a first sound-absorbing box (63); an air inlet pipe (65) connected to the first sound-absorbing box (63) is provided on the first sound-absorbing box (63); and a plurality of first drainage ports (66) are provided at the bottom of the first sound-absorbing box (63); A plurality of first baffle plates (67) are arranged in the first muffler box (63), the upper and lower ends of each first baffle plate (67) are respectively connected to the upper inner wall and the lower inner wall of the first muffler box (63), and the rear end of each first baffle plate (67) is connected to the rear end inner wall of the first muffler box (63); a second baffle plate (68) is arranged between each two adjacent first baffle plates (67), the upper and lower ends of each second baffle plate (68) are respectively connected to the upper inner wall and the lower inner wall of the first muffler box (63), and the front end of each second baffle plate (68) is connected to the front end inner wall of the first muffler box (63); a first spray unit (69) is arranged on the top of the first muffler box (63); The second muffler unit (62) comprises a second muffler box (70), the rear end of the second muffler box (70) is provided with an air outlet pipe (71), a plurality of third baffle plates (72) are provided in the second muffler box (70), the upper and lower ends of each of the third baffle plates (72) are respectively connected to the upper inner wall and the lower inner wall of the second muffler box (70), and the rear end of each of the third baffle plates (72) is connected to the rear end inner wall of the second muffler box (70); a fourth baffle plate (73) is provided between each two adjacent third baffle plates (72), the upper and lower ends of each of the fourth baffle plates (73) are respectively connected to the upper inner wall and the lower inner wall of the second muffler box (70), and the front end of each of the fourth baffle plates (73) is connected to the front end inner wall of the second muffler box (70); the two ends of the dust removal and demisting box (2) are respectively provided with an air inlet end (3) and an air outlet end (5), S2: The liquid generated in the dust removal and demisting unit (1) is circulated through the circulation connection unit; the air inlet end (3) is connected to the air exhaust unit (60) through a connecting pipe; the spray mechanism includes a secondary dust removal nozzle (6) and a perforated nozzle (7); A plurality of first dust removal areas (8) are arranged in intervals in the dust removal and demisting box (2), and each of the first dust removal areas (8) is provided with a first isolation head plate (9) and a first isolation tail plate (10), both sides and the upper end of the first isolation head plate (9) are connected to the inner wall of the dust removal and demisting box (2), the lower end of the first isolation head plate (9) is arranged at intervals with the bottom end of the dust removal and demisting box (2), both sides of the first isolation tail plate (10) are connected to the inner wall of the dust removal and demisting box (2), and the upper and lower ends of the first isolation tail plate (10) are arranged at intervals with the upper and lower ends of the dust removal and demisting box (2); A first stuffing box (11) and a plurality of secondary dust removal nozzles (6) are provided in each of the first dust removal zones (8); each of the secondary dust removal nozzles (6) is provided at the upper end of the dust removal and demisting box body (2); the first stuffing box (11) is connected to the dust removal and demisting box body (2) and is located directly below the secondary dust removal nozzles (6); The dust removal and demisting box (2) is provided with a second dust removal zone (12) and a third dust removal zone (13) at intervals, the second dust removal zone (12) is located between the first dust removal zone (8) and the third dust removal zone (13), the second dust removal zone (12) is provided with a second isolation head plate (15) and a second isolation tail plate (16), both sides and the upper end of the second isolation head plate (15) are connected to the inner wall of the dust removal and demisting box (2), the lower end of the second isolation head plate (15) is spaced from the bottom end of the dust removal and demisting box (2), The two sides of the second isolation tail plate (16) are connected to the inner wall of the dust removal and demisting box body (2), and the upper and lower ends of the second isolation tail plate (16) are respectively arranged at intervals from the upper and lower ends of the dust removal and demisting box body (2); a perforated nozzle (7) and a second stuffing box (17) are arranged in the second dust removal area (12), and each of the perforated nozzle (7) and the second stuffing box (17) is simultaneously connected to the second isolation head plate (15) and the second isolation tail plate (16), and the second stuffing box (17) is located directly below the perforated nozzle (7); The third dust removal zone (13) is provided with a third isolation head plate (18) and a third isolation tail plate (19), both sides and the upper end of the third isolation head plate (18) are connected to the inner wall of the dust removal and demisting box body (2), the lower end of the third isolation head plate (18) is spaced apart from the bottom end of the dust removal and demisting box body (2), both sides of the third isolation tail plate (19) are connected to the inner wall of the dust removal and demisting box body (2), and the upper and lower ends of the third isolation tail plate (19) are spaced apart from the upper and lower ends of the dust removal and demisting box body (2); a third stuffing box (20) is provided in the third dust removal zone (13), and stuffing is provided in the first stuffing box (11), the second stuffing box (17) and the third stuffing box (20); A condensation unit (200) is provided between two adjacent first dust removal zones (8), and a condensation unit (200) is also provided between the second dust removal zone (12) and the first dust removal zone (8) and the third dust removal zone (13); The condensation unit (200) comprises a plurality of inclined plates (201) respectively connected to a first isolation head plate (9), a first isolation tail plate (10), a second isolation head plate (15), a second isolation tail plate (16) and a third isolation head plate (18); two adjacent inclined plates (201) form a group; the openings of the two inclined plates (201) in each group gradually become smaller from top to bottom; a diamond-shaped piece (202) connected to the dust removal and demisting box (2) is disposed below the two inclined plates (201) in each group; ventilation ducts (203) are formed on both sides of the diamond-shaped piece (202). The exhaust unit (60) comprises a pipe (75), a fan is arranged in the pipe (75), the input end and the output end of the pipe (75) are respectively connected to the first sound-absorbing box (63) and the second sound-absorbing box (70); the input end of the pipe (75) is detachably connected to the first sound-absorbing box (63), and the output end of the pipe (75) is detachably connected to the second sound-absorbing box (70); the input end of the pipe (75) is arranged to be higher than the output end and tilted; the sound insulation layer is sound-absorbing cotton, and the sound-absorbing cotton is arranged on the outer wall of the pipe (75); The first spray unit (69) comprises a first water inlet pipe (76) arranged at the top of the first muffler box (63), a plurality of first spray heads (77) being arranged on the first water inlet pipe (76), each of the first spray heads (77) extending into the first muffler box (63) and connected to the upper inner wall of the first muffler box (63); the first spray heads (77) are arranged on both sides of each of the first baffle plates (67); a mounting groove (78) is arranged at the top of the first muffler box (63), the first water inlet pipe (76) is arranged in the mounting groove (78), a plurality of positioning columns (79) are arranged in the mounting groove (78), and a top plate (80) is located above the first water inlet pipe (76) and is detachably connected to the first muffler box (63) through each of the positioning columns (79); A plurality of first drainage ports (66) are provided on both sides of the first baffle plate (67) and the second baffle plate (68); a plurality of first drainage grooves (81) for use with the first drainage ports (66) are provided at the bottom of the first muffler box (63); a water outlet of each first drainage groove (81) is connected to a water collecting box (82); and a water outlet is provided on the water collecting box (82); A self-cleaning unit is provided at the air outlet end (5), and after being dusted by the dust removal and demisting unit (1), the air enters the self-cleaning unit for self-cleaning and dust removal before being discharged; The self-cleaning unit comprises an outer box (100), the front end of the outer box (100) is provided with an air inlet (102), which is connected to an air outlet (5) via the air inlet (102), the rear end of the outer box (100) is provided with an air outlet (103), and a rear cover (105) is provided at the air outlet (103); An inner cylinder (106) is arranged inside the outer box (100), and a plurality of air outlet holes (107) are opened along the length direction of the inner cylinder (106); an extension cylinder (108) penetrating the inner cylinder (106) is arranged at the front end of the inner cylinder (106); the front end of the extension cylinder (108) extends out of the outer box (100) through the air inlet (102); two connecting pieces (109) are arranged inside the outer box (100); the rear half of the inner cylinder (106) and the front half of the extension cylinder (108) are respectively connected to the inner wall of the outer box (100) through the connecting pieces (109); A plurality of air inlet nozzles (130) are arranged on the inner wall of the front half of the extension tube (108); a filter cover (131) is arranged inside the outer box (100); the filter cover (131) is rotatably sleeved on the inner tube (106); and each of the air outlet holes (107) is located inside the filter cover (131); The bottom of the outer box (100) is provided with a sewage outlet (132); The specific method of dust removal in the self-cleaning unit is to pour water (99) into the outer box (100) until the lower end of the filter cover (131) contacts the water (99), so that the filter cover (131) can be cleaned when it rotates. The gas containing dust is sent into the inner cylinder (106) through the fan. When passing through the extension cylinder (108), the dust is humidified by the air inlet nozzle (130). The humidified dust enters the inner cylinder (106) together with the gas. ), and then enters between the inner cylinder (106) and the filter cover (131) through the air outlet (107). At this time, the gas is blown onto the filter cover (131), driving the filter cover (131) to rotate. At the same time, the gas passes through the filter cover (131), and the humidified dust is attached to the filter cover (131). When the rotating filter cover (131) contacts the water in the outer box, the dust attached to the filter cover (131) is cleaned, and the gas is discharged through the rear cover (105); The air outlet holes (107) are arranged in a spiral array along the length direction of the inner cylinder (106); the connecting member (109) comprises a plurality of connecting rods (152), and the connecting rods (152) are arranged in a circular array around the center line of the inner cylinder (106).

2. The environmentally friendly dust removal process for cable tunnel construction as claimed in claim 1 is characterized in that: The front half of the second muffler box (70) is a spraying area (83), and a second spraying unit (86) is provided in the spraying area (83). The second spraying unit (86) includes a plurality of second spray heads (87), and the input end of each second spray head (87) extends upward through the second muffler box (70) and is connected to a second water inlet pipe (90); A plurality of second drainage ports (91) are arranged in the second muffler box (70); a second drainage groove (92) for use with the second drainage ports (91) is arranged at the lower end of the second muffler box (70); a water outlet of the second drainage groove (92) is connected to the water collecting tank (82); the first muffler box (63) and the second muffler box (70) are both provided with a guide groove (93); two adjacent first drainage ports (66) and two adjacent second drainage ports (91) are connected via the guide grooves (93).

3. The environmentally friendly dust removal process for cable tunnel construction as claimed in claim 2 is characterized in that: The circulation connection unit comprises a first water delivery pipe and a second water delivery pipe. The lower half of the dust removal and demisting box (2) is connected to each of the secondary dust removal nozzles (6) through the first water delivery pipe. The water inlet end of the perforated nozzle (7) is connected to the water outlet end of the second water delivery pipe. The water inlet end of the second water delivery pipe is simultaneously connected to the lower half of the dust removal and demisting box (2) and the external pipe. The first water delivery pipe and the second water delivery pipe are both provided with water pumps. The first water delivery pipe and the second water delivery pipe are both provided with valves for closing or opening the first water delivery pipe and the second water delivery pipe. The perforated nozzle (7) comprises a perforated main pipe (22) and a plurality of perforated sub-pipes (23). The perforated main pipe (22) is detachably connected to the second isolation head plate (15) and the second isolation tail plate (16), and is connected to the second water delivery pipe. The water inlet end of each of the perforated sub-pipes (23) is connected to the perforated main pipe (22).

4. The environmentally friendly dust removal process for cable tunnel construction as claimed in claim 3 is characterized in that: A water supply pipe (151) is arranged on the outer wall of the front half of the extension tube (108); each of the air inlet nozzles (130) is connected to the water outlet end of the water supply pipe (151); and the water inlet end of the water supply pipe (151) is connected to an external pipe; a plurality of guide plates (153) are arranged between the filter cover (131) and the inner tube (106); one end of each of the guide plates (153) is connected to the inner wall of the filter cover (131); and the other end of each of the guide plates (153) is arranged at a distance from the inner tube (106).

5. The environmentally friendly dust removal process for cable tunnel construction as claimed in claim 4 is characterized in that: The rear cover (105) comprises a horn section (155) and a straight connecting section (156); the cross section of the horn section (155) gradually decreases from the front end to the rear end; the rear end of the horn section (155) is connected to the front end of the straight connecting section (156); an overflow pipe (157) is provided on one side of the outer box body (100).

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