A ductile waterproof coating spraying device for tunnel construction and a construction method thereof

Abstract

The present application relates to the field of tunnel vault spraying technology, in particular to a ductility waterproof coating spraying device for tunnel construction and a construction method thereof, a first gear and a third gear are arranged on a rotating rod and are respectively meshed with a first toothed plate and a third toothed plate, a first bevel gear is connected to an end of the rotating rod, and the first bevel gear is perpendicularly meshed with a second bevel gear, the beneficial effects are as follows: the driving of the adjusting telescopic rod is utilized to synchronously drive the transmission gear set to move, so that the nozzle pipe is recycled, the purpose of protecting the nozzle pipe is achieved, when descending, the third toothed plate is moved to cut off the communication with the feeding pipeline, the first toothed plate is moved to increase the liquid storage inner cavity, and the purpose of reducing the internal air pressure is achieved, the residual liquid in the upper end port of the nozzle pipe flows back to the liquid storage inner cavity under the action of the air pressure, the nozzle pipe port is prevented from being blocked, and the service life and spraying precision of the nozzle pipe are further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of spraying technology of tunnel vault, in particular to a flexible waterproof coating spraying device for tunnel construction and a construction method thereof. BACKGROUND

[0002] After the tunnel construction is formed, the inner wall of the tunnel needs to be waterproofed, and the common treatment method is to spray flexible waterproof coating. In the prior art, a worker manually holds a spray head to spray the tunnel.

[0003] However, in the actual spraying process, the length of the tunnel is long and the height is high, and a supporting bracket needs to be matched. However, due to the different radii of the vaults, the adaptability of the existing mechanical spraying is poor.

[0004] After spraying is completed, the port of the nozzle has a small inner diameter, which easily causes residual liquid to adhere, thereby easily causing the nozzle to be blocked. Therefore, the prior art needs to use a thimble to clean the port of the nozzle before spraying, and the unblocking of the thimble easily causes damage to the nozzle, thereby reducing the spraying precision. SUMMARY

[0005] The purpose of the present application is to provide a flexible waterproof coating spraying device for tunnel construction and a construction method thereof to solve the problems raised in the background.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0007] A flexible waterproof coating spraying device for tunnel construction, the spraying device comprises:

[0008] A spraying frame is installed in the tunnel through a plurality of groups of symmetrical rollers, the upper end of the spraying frame is provided with a material tank loaded with flexible waterproof coating, the material tank is connected to a spray head through a material pump and a feeding pipeline, and a driving assembly is arranged in the spraying frame to drive the spray head to rotate along the vault arc of the upper end of the tunnel;

[0009] The inner cavity of the spray head is arranged as a liquid storage cavity, a nozzle pipe is elastically mounted at the upper end of the liquid storage cavity, the upper end of the nozzle pipe extends to the outer side of the spray head, an upper pressing plate is fixedly connected to the outer wall of the upper end of the nozzle pipe, the lower end of the upper pressing plate is connected to the upper end of the nozzle through an adjusting telescopic rod, a lateral slide is arranged at the left side of the liquid storage cavity, a piston is slidably mounted in the lateral slide, a first tooth plate extending to the outer side of the lateral slide is transversely connected to the outer side of the piston, a sealing plate is transversely slidably mounted between the lower end of the liquid storage cavity and the feeding pipeline, a through opening communicating the inner cavity of the feeding pipeline and the liquid storage cavity is arranged on the sealing plate, a third tooth plate extending to the outer side of the spray head is arranged on the other side of the sealing plate, and the first tooth plate and the third tooth plate are transversely and horizontally arranged;

[0010] A linkage assembly is arranged on the upper end of the second toothed plate, and a transmission gear set is arranged on the lower end of the third toothed plate. The transmission gear set comprises a rotating shaft, a first bevel gear and a second bevel gear. The rotating shaft is arranged at the front end of the first toothed plate and the third toothed plate, and the rotating shaft is provided with a first gear and a third gear which are respectively engaged with the first toothed plate and the third toothed plate. The first bevel gear is connected to the end of the rotating shaft, and the first bevel gear is vertically engaged with the second bevel gear. The second bevel gear is laterally and synchronously connected with a second gear which is engaged with the second toothed plate.

[0011] Preferably, the driving assembly comprises a motor-driven rotating shaft, the lower end of the feeding pipe is fixedly sleeved on the rotating shaft, the material box is fixed on the side wall of the feeding pipe, and the upper end of the spraying frame is fixedly installed with a limiting rotating rail. The outer wall of the middle section of the feeding pipe is provided with a limiting block which is rotatably installed on the limiting rotating rail.

[0012] Preferably, the upper end of the spraying frame is provided with an adjusting frame driven by a lifting cylinder, the adjusting frame is arranged in a double-layer structure, two groups of adjusting assemblies which are distributed in front and back are slidingly inserted on the adjusting frame of the upper layer, the adjusting assembly comprises a plurality of linearly arranged lifting sleeves, a fixing column corresponding to the lifting sleeve is vertically and fixedly installed on the adjusting frame of the lower layer, the lower end of the lifting sleeve is elastically sleeved on the upper end of the fixing column, the upper end of a pair of adjusting assemblies which are distributed in front and back is fixedly installed with a flexible rotating rail, the feeding pipe is rotatably installed in the gap between the pair of flexible rotating rails, the limiting block on the feeding pipe is rotatably inserted on the flexible rotating rail, and the driving assembly is installed at both ends of the adjusting frame.

[0013] Preferably, the upper end of the lifting sleeve is provided with a top ball, a first spring is compressed between the lifting sleeve and the fixing column, the first spring is located in the inner cavity of the lifting sleeve, and the lower end of the first spring abuts against the upper end surface of the fixing column. A pneumatic clamp plate is arranged in the rear inner cavity of the adjusting frame, and the pneumatic clamp plate is tightly clamped on the outer wall of the lifting sleeve.

[0014] Preferably, the driving assembly comprises a pair of winding motors which are symmetrically distributed left and right, a traction rope is wound on each of the pair of winding motors which are distributed left and right, and the middle section of the traction rope is fixedly bound on the spray head.

[0015] Preferably, the upper end of the nozzle pipe is sleeved with a second spring, the upper end of the second spring abuts against the lower end surface of the upper pressing plate, the lower end of the nozzle pipe is provided with a limiting ring which is compressed on the upper end inner wall of the liquid storage cavity, a thimble is vertically inserted in the inner cavity of the nozzle pipe, and the outer diameter of the thimble is smaller than the inner diameter of the nozzle pipe.

[0016] Preferably, the lower end of the nozzle pipe is provided with a lifting transverse groove, the lower end of the ejector pin is fixed on the inner wall of the liquid storage cavity through a fixed beam, and the lower end of the lifting transverse groove is opposite to the fixed beam.

[0017] Preferably, the lower end of the nozzle pipe is provided with a lifting transverse groove, the lower end of the ejector pin is fixed on the inner wall of the liquid storage cavity through a fixed beam, and the lower end of the lifting transverse groove is opposite to the fixed beam.

[0018] Preferably, the second bevel gear and the second gear are installed on the same rotating shaft, the rotating shaft bearing is rotatably installed in the side wall of the nozzle, and the second gear is located at the front end of the second toothed plate.

[0019] A construction method is realized by the above-mentioned spraying device for the ductile waterproof coating for tunnel construction, and the construction method comprises the following steps:

[0020] S1: transporting the spraying frame into the tunnel, designing the driving assembly and the rotating rail according to the upper end vault arc of the tunnel, and then installing the nozzle on the driving assembly along the rotating rail;

[0021] S2: under the action of the material pump, the ductile waterproof coating is transported to the nozzle, the angle of the nozzle is adjusted through the rotation of the driving assembly, and the upper end vault of the tunnel is uniformly sprayed through rotation;

[0022] S3: after the spraying is completed, the nozzle pipe is lowered by adjusting the telescopic rod, so that the nozzle pipe is stored in the liquid storage cavity, in the process of lowering, the second toothed plate is synchronously pulled down, then the first toothed plate and the third toothed plate are synchronously slid transversely through the transmission of the transmission gear set, then in the sliding process of the third toothed plate, the sealing plate is cut off from the communication with the feeding pipeline, the sliding of the first toothed plate increases the volume of the liquid storage cavity, and the internal pressure is reduced, so that the residual liquid in the nozzle pipe port flows back to the liquid storage cavity under the action of the atmospheric pressure.

[0023] Compared with the prior art, the beneficial effects of the present application are:

[0024] The present application adjusts the spraying frame, adapts to the arc of the tunnel vault, drives the transmission gear set through the telescopic rod, realizes the recovery of the nozzle pipe, protects the nozzle pipe, cuts off the communication with the feeding pipeline through the movement of the third toothed plate in the process of lowering, drives the first toothed plate to move, increases the liquid storage cavity, reduces the internal pressure, makes the residual liquid in the nozzle pipe port flow back to the liquid storage cavity under the action of the atmospheric pressure, avoids the blockage of the nozzle pipe port, and further improves the service life and spraying precision of the nozzle pipe. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 Structure diagram of embodiment 2 of the application;

[0026] Figure 2 Structure diagram of embodiment 3 of the application;

[0027] Figure 3 Structure diagram of embodiment 4 of the application; Figure 1 Structure diagram of embodiment 5 of the application;

[0028] Figure 4 Structure diagram of the spray head of the application;

[0029] Figure 5 Structure diagram of the sealing plate of the application;

[0030] Figure 6 Structure diagram of the nozzle pipe of the application;

[0031] Figure 7 Structure diagram of the spray head of the application.

[0032] In the figure: 1, tunnel; 2, spraying frame; 3, roller; 4, driving assembly; 5, material box; 6, limiting rotary rail; 7, feeding pipeline; 8, limiting block; 9, material pump; 10, adjusting frame; 11, winding motor; 12, traction rope; 13, spray head; 14, fixed column; 15, lifting cylinder; 16, flexible rotary rail; 17, lifting sleeve; 18, nozzle pipe; 19, first spring; 20, pneumatic clamping plate; 21, upper pressing plate; 22, second spring; 23, ejector pin; 24, lateral slide; 25, piston; 26, liquid storage cavity; 27, limiting ring; 28, fixed beam; 29, rotary lever; 30, first toothed plate; 31, second toothed plate; 32, first gear; 33, third toothed plate; 34, first bevel gear; 35, second gear; 36, second bevel gear; 37, sealing plate; 38, rubber plug; 39, transverse slide groove; 40, third spring; 41, through opening; 42, adjusting telescopic rod; 43, third gear; 44, lifting transverse groove. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0034] Please refer to Figures 1 to 7 The application provides a technical solution:

[0035] Embodiment 1:

[0036] A kind of ductility waterproof coating spraying device for tunnel construction, spraying device includes spraying frame 2 and linkage assembly, spraying frame 2 is installed in tunnel 1 by left-right symmetrical multiple groups of rollers 3, the upper end of spraying frame 2 is provided with material tank 5 loaded with ductility waterproof coating, material tank 5 is connected with spray head 13 by material pump 9 and feed pipe 7, drive assembly 4 in spraying frame 2 is provided, which drives spray head 13 to rotate along the arch crown of tunnel 1 upper end.

[0037] Convenient transportation is realized by roller 3 in tunnel 1 of spraying frame 2, to adapt long distance tunnel 1 spraying operation, material tank 5 and material pump 9 are used to feed spray head 13, to achieve the purpose of spraying, drive assembly 4 is used to drive spray head 13 to rotate along the arch crown, to realize full-angle spraying.

[0038] The inner cavity of spray head 13 is set as liquid storage cavity 26, the upper end of liquid storage cavity 26 is elastically mounted with nozzle pipe 18, the upper end of nozzle pipe 18 extends to the outside of spray head 13, and the upper end of nozzle pipe 18 is fixedly connected with upper pressing plate 21, and the lower end of upper pressing plate 21 is connected with the upper end of spray head 13 by adjusting telescopic rod 42.

[0039] Telescopic rod 42 is used to realize the telescopic installation of nozzle pipe 18, to realize the storage and extension of nozzle pipe 18, and to improve the protection of nozzle pipe 18.

[0040] The left side of liquid storage cavity 26 is provided with lateral slide 24, piston 25 is slidably installed in lateral slide 24, and first tooth plate 30 extending to the outside of lateral slide 24 is connected to the outside of piston 25.

[0041] By setting the cooperation of lateral slide 24 and piston 25, the sliding of piston 25 in lateral slide 24 is used to adjust the pressure in liquid storage cavity 26.

[0042] Sealing plate 37 is slidably installed between the lower end of liquid storage cavity 26 and feed pipe 7, and through opening 41 is provided on sealing plate 37, which communicates the inner cavity of feed pipe 7 with liquid storage cavity 26.

[0043] Sealing plate 37 and through opening 41 are used to realize the communication of feed pipe 7 and liquid storage cavity 26.

[0044] On the other side of the sealing plate 37, a third toothed plate 33 extending to the outside of the nozzle 13 is provided. The first toothed plate 30 and the third toothed plate 33 are arranged horizontally parallel. The linkage assembly includes a second toothed plate 31 and a transmission gear set. The upper end of the second toothed plate 31 is connected to the lower end of the upper pressure plate 21. The transmission gear set is installed at the lower end of the third toothed plate 33. The transmission gear set includes a rotating rod 29, a first bevel gear 34, and a second bevel gear 36. The rotating rod 29 is located at the front end of the first toothed plate 30 and the third toothed plate 33, and the rotating rod 29 is provided with gears respectively connected to the first toothed plate 30 and the third toothed plate 33. The first gear 32 and the third gear 43 are meshed and connected by the first toothed plate 30 and the third toothed plate 33. The first bevel gear 34 is connected to the end of the rotating rod 29. The first bevel gear 34 meshes perpendicularly with the second bevel gear 36. The second gear 35 is synchronously connected to the side of the second bevel gear 36. The second gear 35 is meshed and connected to the second toothed plate 31. The second bevel gear 36 and the second gear 35 are mounted on the same rotating shaft. The rotating shaft bearing is rotatably mounted in the side wall of the nozzle 13. The second gear 35 is located at the front end of the second toothed plate 31.

[0045] By adjusting the telescopic rod 42, the upper pressure plate 21 is driven to descend, which in turn pulls the second toothed plate 31 to descend. During the descent, the second toothed plate 31 meshes with and drives the second gear 35 to rotate, which in turn pulls the second bevel gear 36 and the first bevel gear 34 to rotate. This, in turn, drives the rotating rod 29 to rotate synchronously. The rotation of the rotating rod 29 drives the first gear 32 and the third gear 43 to rotate. The first gear 32 and the third gear 43 drive the first toothed plate 30 and the third toothed plate 33 to slide laterally through meshing transmission. During the sliding of the third toothed plate 33, the sealing plate 37 cuts off the connection with the feed pipe 7. The sliding of the first toothed plate 30 increases the volume of the liquid storage cavity 26 and reduces the internal pressure, causing the residual liquid in the nozzle pipe 18 port to flow back into the liquid storage cavity 26 under atmospheric pressure.

[0046] Example 2: Figure 1 As shown, in order to ensure the stability of the rotation drive, the drive assembly 4 includes a motor-driven rotating shaft, the lower end of the feed pipe 7 is fixedly sleeved on the rotating shaft, the material box 5 is fixed on the side wall of the feed pipe 7, the upper end of the spray frame 2 is fixedly installed with a limit rail 6, and the outer wall of the middle section of the feed pipe 7 is provided with a limit block 8 that is rotatably installed on the limit rail 6.

[0047] By setting the limit rail 6 and the limit block 8, the rotation angle of the feed pipe 7 is limited and supported, ensuring the smoothness of the rotation adjustment.

[0048] Example 3: As Figure 2 As shown, based on Example 1, due to the varying curvature of the tunnel 1 arch, the angle of track switching is difficult to precisely match.

[0049] The upper end of the spraying frame 2 is provided with an adjusting frame 10 driven by a lifting cylinder 15, the adjusting frame 10 is provided in a double-layer structure, two groups of adjusting assemblies are slidingly inserted on the upper adjusting frame 10 and are distributed in front and back, the adjusting assembly comprises a plurality of groups of linearly arranged lifting sleeves 17, a fixed column 14 corresponding to the lifting sleeve 17 is vertically and fixedly installed on the lower adjusting frame 10, the lower end of the lifting sleeve 17 is elastically sleeved on the upper end of the fixed column 14, the upper end of the front and back distributed pair of adjusting assemblies is fixedly installed with a flexible rotating rail 16, the feeding pipeline 7 is rotatably installed in the gap between the front and back distributed pair of flexible rotating rails 16, the limiting block 8 on the feeding pipeline 7 is rotatably inserted on the flexible rotating rail 16, and the driving assembly 4 is installed at both ends of the adjusting frame 10.

[0050] The lifting cylinder 15 is arranged to drive the adjusting frame 10 to rise, so that the lifting sleeve 17 is abutted against the arc surface of the arch top, and the length of the plurality of groups of lifting sleeves 17 is adapted to the arch degree under the extrusion of the arch top.

[0051] The upper end of the lifting sleeve 17 is provided with a top ball, the first spring 19 is compressed between the lifting sleeve 17 and the fixed column 14, the first spring 19 is located in the inner cavity of the lifting sleeve 17, the lower end of the first spring 19 is abutted against the upper end surface of the fixed column 14, the rear inner cavity of the adjusting frame 10 is provided with a pneumatic clamp plate 20, and the pneumatic clamp plate 20 is tightly clamped on the outer wall of the lifting sleeve 17.

[0052] The top ball is used to realize point contact with the arc surface of the arch top, the pneumatic clamp plate 20 is used to fix the height of the extruded lifting sleeve 17, then the adjusting frame 10 is driven to descend by the lifting cylinder 15, the flexible rotating rail 16 is installed at the upper end of the lifting sleeve 17, so that the flexible rotating rail 16 is adapted to the arch degree of the arch top, and finally the spray head 13 is installed on the flexible rotating rail 16.

[0053] The driving assembly 4 comprises a pair of winding motors 11 which are symmetrically distributed left and right, the pair of winding motors 11 which are symmetrically distributed left and right are both wound with a traction rope 12, and the middle section of the traction rope 12 is fixedly bound on the spray head 13.

[0054] The winding motor 11 is used to achieve the purpose of driving the spray head 13 to rotate left and right by traction winding of the traction rope 12, so as to adapt to full-angle spraying of the arch top of the tunnel 1.

[0055] In the embodiment 1, the upper end of the nozzle pipe 18 is sleeved with a second spring 22, the upper end of the second spring 22 is abutted against the lower end surface of the upper pressing plate 21, the lower end of the nozzle pipe 18 is provided with a limiting ring 27, the limiting ring 27 is compressed on the upper end inner wall of the liquid storage cavity 26, a thimble 23 is vertically inserted in the inner cavity of the nozzle pipe 18, and the outer diameter of the thimble 23 is smaller than the inner diameter of the nozzle pipe 18.

[0056] The nozzle tube 18 is elastically installed by setting a second spring 22. A pin 23 is set inside the nozzle tube 18 so that it can be sleeved with the pin 23 during the descent of the nozzle tube 18. Under the pressure of the pin 23, excess material is squeezed out, and the remaining residual paint flows back under the action of air pressure, thus avoiding the paint from accumulating into clumps at the port of the nozzle tube 18 and being difficult to clean.

[0057] The lower end of the nozzle tube 18 is provided with a lifting transverse groove 44, and the lower end of the ejector pin 23 is fixed to the inner wall of the liquid storage cavity 26 by a fixing beam 28. The lower end of the lifting transverse groove 44 is directly opposite the fixing beam 28.

[0058] By setting the lifting cross groove 44 in coordination with the fixed beam 28, the smooth lifting and lowering adjustment of the nozzle pipe 18 is ensured, and collisions with the fixed beam 28 are avoided.

[0059] Example 5: Figure 5 As shown, based on embodiment 4, a transverse groove 39 is provided on the lower inner wall of the nozzle 13. The sealing plate 37 is slidably inserted into the transverse groove 39. The length of the transverse groove 39 is greater than the length of the sealing plate 37. A third spring 40 is provided on the side of the sealing plate 37 near the transmission gear set. The third spring 40 is pressed between the side wall of the transverse groove 39 and the end face of the sealing plate 37. A rubber plug 38 is provided on the right side of the sealing plate 37.

[0060] The sealing plate 37 is elastically installed by setting a third spring 40, and then the sealing plate 37 is elastically reset by the third spring 40 when the transmission gear set is reset, and the end of the sealing plate 37 is sealed by the rubber plug 38 to avoid leakage.

[0061] A construction method based on the above-mentioned tough waterproof coating spraying device for tunnel construction, the construction method comprising:

[0062] S1: Transport the spraying frame 2 into the tunnel 1, design the drive assembly 4 and the rotating rail according to the curvature of the upper arch of the tunnel 1, and then install the spray head on the drive assembly 4 along the rotating rail;

[0063] S2: Under the action of the material pump 9, the tough waterproof coating is transported to the spray head 13. The angle of the spray head 13 is adjusted by the rotation of the drive component 4 to achieve uniform spraying of the upper arch of the tunnel 1.

[0064] S3: After the spraying is completed, the nozzle tube 18 is lowered by adjusting the telescopic rod 42 to be accommodated in the liquid storage cavity 26. During the lowering process, the second tooth plate 31 is synchronously pulled down, and then the first tooth plate 30 and the third tooth plate 33 are synchronously driven to slide laterally by the transmission of the transmission gear set. During the sliding process of the third tooth plate 33, the sealing plate 37 is cut off from the communication with the feeding pipeline 7. The sliding of the first tooth plate 30 increases the volume of the liquid storage cavity 26, and the internal pressure is reduced. The residual liquid in the port of the nozzle tube 18 is returned to the liquid storage cavity 26 under the action of the atmospheric pressure.

[0065] While the embodiments of the application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the application, which is defined by the appended claims and their equivalents.

Claims

1. A ductile waterproof coating spraying device for tunnel construction, characterized in that: The spraying device comprises: A spraying frame (2) is installed in a tunnel (1) through a plurality of groups of symmetrical left and right rollers (3), an upper end of the spraying frame (2) is provided with a material box (5) loaded with a flexible waterproof coating, the material box (5) is connected with a spray head (13) through a material pump (9) and a feeding pipeline (7), and the spraying frame (2) is provided with a driving assembly (4) for driving the spray head (13) to rotate along an upper end arch of the tunnel (1); An inner cavity of the spray head (13) is arranged as a liquid storage cavity (26), an upper end of the liquid storage cavity (26) is elastically mounted with a nozzle pipe (18), an upper end of the nozzle pipe (18) extends to an outer side of the spray head (13), an upper end outer wall of the nozzle pipe (18) is fixedly connected with an upper pressing plate (21), the upper pressing plate (21) is connected with the upper end of the spray head (13) through an adjusting telescopic rod (42), a left side of the liquid storage cavity (26) is transversely provided with a lateral slide (24), the lateral slide (24) is slidably mounted with a piston (25), an outer side of the piston (25) is transversely connected with a first toothed plate (30) extending to an outer side of the lateral slide (24), a lower end of the liquid storage cavity (26) and the feeding pipeline (7) are transversely slidably mounted with a sealing plate (37), the sealing plate (37) is provided with a through opening (41) communicating an inner cavity of the feeding pipeline (7) and the liquid storage cavity (26), the other side of the sealing plate (37) is provided with a third toothed plate (33) extending to an outer side of the spray head (13), and the first toothed plate (30) and the third toothed plate (33) are transversely and parallelly arranged; A linkage assembly, the linkage assembly comprises a second toothed plate (31) and a transmission gear set, the upper end of the second toothed plate (31) is connected to the lower end of the upper pressing plate (21), the transmission gear set is installed at the lower end of the third toothed plate (33), the transmission gear set comprises a rotating rod (29), a first bevel gear (34) and a second bevel gear (36), the rotating rod (29) is located at the front end of the first toothed plate (30) and the third toothed plate (33), the rotating rod (29) is provided with a first gear (32) and a third gear (43) which are respectively meshed with the first toothed plate (30) and the third toothed plate (33), the first bevel gear (34) is connected to the end of the rotating rod (29), the first bevel gear (34) is perpendicularly meshed with the second bevel gear (36), the second bevel gear (36) is synchronously connected with a second gear (35) on the side, and the second gear (35) is meshed with the second toothed plate (31). The upper end of the spraying frame (2) is provided with an adjusting frame (10) driven by a lifting cylinder (15), the adjusting frame (10) is provided in a double-layer structure, two groups of adjusting assemblies are slidingly inserted on the upper adjusting frame (10) and are distributed at front and back intervals, the adjusting assembly comprises a plurality of groups of linearly arranged lifting sleeves (17), a fixed column (14) corresponding to the lifting sleeve (17) is vertically and fixedly installed on the lower adjusting frame (10), the lower end of the lifting sleeve (17) is elastically sleeved on the upper end of the fixed column (14), the upper ends of a pair of adjusting assemblies distributed at front and back are fixedly installed with flexible rotating rails (16), the feeding pipe (7) is rotatably installed in the gap between the pair of flexible rotating rails (16) distributed at front and back, the limiting block (8) on the feeding pipe (7) is rotatably inserted on the flexible rotating rail (16), and the driving assembly (4) is installed at the two ends of the adjusting frame (10).

2. The ductile waterproof coating spraying device for tunnel construction according to claim 1, characterized in that: The driving assembly (4) comprises a rotating shaft driven by a motor, the lower end of the feeding pipe (7) is fixedly sleeved on the rotating shaft, the material box (5) is fixed on the side wall of the feeding pipe (7), the upper end of the spraying frame (2) is fixedly installed with a limiting rotating rail (6), and the outer wall of the middle section of the feeding pipe (7) is provided with a limiting block (8) rotatably installed on the limiting rotating rail (6).

3. The ductile waterproof coating spraying device for tunnel construction according to claim 1, characterized in that: The upper end of the lifting sleeve (17) is provided with a top ball, the first spring (19) is compressed between the lifting sleeve (17) and the fixed column (14), the first spring (19) is located in the inner cavity of the lifting sleeve (17), and the lower end of the first spring (19) abuts against the upper end face of the fixed column (14), the rear inner cavity of the adjusting frame (10) is provided with a pneumatic clamping plate (20), and the pneumatic clamping plate (20) is tightly clamped on the outer wall of the lifting sleeve (17).

4. The ductile waterproof coating spraying device for tunnel construction according to claim 3, characterized in that: The driving assembly (4) comprises a pair of winding motors (11) symmetrically distributed left and right, a traction rope (12) is wound on each of the pair of winding motors (11) distributed left and right.

5. The ductile waterproof coating spraying device for tunnel construction according to claim 3, characterized in that: The upper end of the nozzle pipe (18) is sleeved with a second spring (22), the upper end of the second spring (22) abuts against the lower end face of the upper pressing plate (21), the lower end of the nozzle pipe (18) is provided with a limiting ring (27), the limiting ring (27) is compressed on the upper end inner wall of the liquid storage cavity (26), a thimble (23) is vertically inserted in the inner cavity of the nozzle pipe (18), and the outer diameter of the thimble (23) is smaller than the inner diameter of the nozzle pipe (18).

6. The ductile waterproof coating spraying device for tunnel construction according to claim 5, characterized in that: The lower end of the nozzle pipe (18) is provided with a lifting horizontal groove (44), the lower end of the thimble (23) is fixed on the inner wall of the liquid storage cavity (26) through a fixed beam (28), and the lower end of the lifting horizontal groove (44) is opposite to the fixed beam (28).

7. The ductile waterproof coating spraying device for tunnel construction according to claim 1, characterized in that: The lower end inner wall of the spray head (13) is transversely provided with a transverse sliding groove (39), the sealing plate (37) is slidingly inserted into the transverse sliding groove (39), the length of the transverse sliding groove (39) is greater than the length of the sealing plate (37), the side of the sealing plate (37) close to the transmission gear set is provided with a third spring (40), the third spring (40) is pressed between the side wall of the transverse sliding groove (39) and the end surface of the sealing plate (37), and the right side of the sealing plate (37) is provided with a rubber plug (38).

8. The ductile waterproof coating spraying device for tunnel construction according to claim 1, characterized in that: The second bevel gear (36) and the second gear (35) are installed on the same rotating shaft, the rotating shaft bearing is rotatably installed in the side wall of the spray head (13), and the second gear (35) is located at the front end of the second toothed plate (31).

9. A construction method using the ductile waterproof coating spraying device for tunnel construction according to any one of claims 1-8, characterized in that: The construction method comprises: S1: transporting the spraying frame (2) into the tunnel (1), designing the driving assembly (4) and the rotating rail according to the upper end vault curvature of the tunnel (1), and then installing the spray head on the driving assembly (4) along the rotating rail; S2: under the action of the material pump (9), the ductile waterproof coating is transported to the spray head (13), the angle of the spray head (13) is adjusted through the rotation of the driving assembly (4), and the upper end vault of the tunnel (1) is uniformly sprayed by rotation; S3: after spraying is completed, the nozzle pipe (18) is lowered by adjusting the telescopic rod (42) to drive the nozzle pipe (18) to be stored in the liquid storage inner cavity (26), in the descending process, the second toothed plate (31) is synchronously pulled down, and then the first toothed plate (30) and the third toothed plate (33) are driven to synchronously slide transversely through the transmission of the transmission gear set, and then in the sliding process of the third toothed plate (33), the sealing plate (37) is cut off in communication with the feeding pipe (7), the sliding of the first toothed plate (30) makes the volume of the liquid storage inner cavity (26) increase, the internal pressure decreases, and the residual liquid in the port of the nozzle pipe (18) flows back to the liquid storage inner cavity (26) under the action of atmospheric pressure.

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