Mortar spraying device and method applied to inner wall of tunnel

Abstract

The invention discloses a mortar spraying device and method applied to the inner wall of a tunnel, the mortar spraying device comprises a transfer frame detachably mounted on a tunnel construction vehicle, a walking piece capable of walking along the arc shape of the tunnel is mounted on the transfer frame, a radial telescopic arm is mounted on the walking piece, and the radial telescopic arm is connected with the transfer frame. The radial telescopic arm is connected with an adjustable double-head spraying mechanism through a sliding seat, a longitudinal driving mechanism is installed between the adjustable double-head spraying mechanism and the sliding seat, and a wet-type elastic rolling mechanism is installed on the adjustable double-head spraying mechanism. According to the method, continuous spraying operation on the inner wall of the tunnel is achieved on the basis of the device, and mortar is firmly attached to the inner wall of the tunnel. The spraying efficiency can be effectively improved, the situation of slurry falling is avoided, it is guaranteed that the thickness of a slurry spraying layer is uniform, and the construction quality of the inner wall of a tunnel is improved. The device is suitable for the technical field of mortar spraying on the inner wall of the tunnel.

Description

Technical Field

[0001] The present invention belongs to the technical field of tunnel construction, and in particular, relates to a mortar spraying device and method applied to the inner wall of a tunnel. Background Art

[0002] At present, in the process of tunnel construction, after the shield machine excavates the tunnel to form it, it is necessary to anchor the steel bars on the inner wall of the tunnel, and then tie the steel skeleton; after the tying is completed, the concrete mortar is sprayed on the inner wall of the tunnel and covers the steel skeleton, thereby ensuring the strength and flatness of the inner wall of the tunnel. However, in the existing mortar spraying process, after the mortar is sprayed on the inner wall of the tunnel, part of the mortar will fall off the tunnel and fall, affecting the quality of the spraying. In order to overcome this defect, it is necessary to check while spraying, and after finding the area where the mortar is falling, manually apply concrete mortar to fill the missing parts of the spraying layer. Moreover, the existing spraying equipment often has uneven spraying, resulting in uneven thickness of the spraying layer, which affects the strength of the inner wall of the tunnel. Therefore, there is an urgent need for a mortar spraying equipment to improve the spraying efficiency, avoid the situation of mortar falling, and ensure that the thickness of the spraying layer is uniform, so as to improve the quality of the inner wall construction of the tunnel. Summary of the invention

[0003] The present invention provides a mortar spraying device and method applied to the inner wall of a tunnel, which are used to improve the spraying efficiency, avoid mortar falling, ensure the uniform thickness of the spraying layer, and improve the quality of the inner wall construction of the tunnel.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows: A mortar spraying device applied to the inner wall of a tunnel comprises an adapter frame detachably mounted on a tunnel construction vehicle, a running member capable of moving along the arc shape of the tunnel is mounted on the adapter frame, a radial telescopic arm is mounted on the running member, the radial telescopic arm is connected to an adjustable double-head spraying mechanism via a sliding seat, a longitudinal driving mechanism is mounted between the adjustable double-head spraying mechanism and the sliding seat, and a wet elastic rolling mechanism is mounted on the adjustable double-head spraying mechanism.

[0005] Furthermore, the adapter frame includes an adapter seat detachably connected to the arched guide rail, and the adapter seat is detachably connected to the tunnel construction vehicle; the running member is a moving slide, which is assembled on the arched guide rail and moves along the arched guide rail.

[0006] Furthermore, the sliding seat includes a seat body detachably connected to the radial telescopic arm, a longitudinal slide rail extending along the length direction of the tunnel is constructed on the seat body, and the adjustable double-head spraying mechanism is slidably assembled on the longitudinal slide rail.

[0007] Furthermore, the longitudinal drive mechanism includes a drive motor mounted on the base body, a longitudinal lead screw is coaxially connected to the output shaft of the drive motor, and the longitudinal lead screw is threadedly connected to the lower portion of the adjustable double-head spraying mechanism.

[0008] Furthermore, the adjustable double-head spraying mechanism includes a spray shell with sliding bars symmetrically constructed on both sides of the lower part. The spray shell is slidably connected to the longitudinal slide rail through the two sliding bars. A spray chamber is formed in the spray shell. Two V-shaped spray nozzles are constructed at one end of the spray shell close to the tunnel wall. A slurry inlet connected to the spray chamber is opened on the spray shell, and the slurry delivery pipe is connected to the spray chamber through the slurry inlet.

[0009] Furthermore, a slurry regulating member is provided in the spraying chamber and between the inlet ends of the two spray nozzles, and connecting shafts coinciding with the axis thereof are respectively constructed at both ends of the slurry regulating member, and the two connecting shafts are rotatably connected to the two opposite end walls of the spraying shell respectively, and one connecting shaft is transmission-connected to the spraying shell through an angle adjustment assembly, and a plate-shaped dividing gate is movably connected to one end of the spraying shell close to the tunnel peripheral wall and between the two spray nozzles, and one end of the plate-shaped dividing gate extending into the spraying chamber elastically abuts against the outer surface of the slurry regulating member.

[0010] Furthermore, the angle adjustment assembly includes a power motor installed on the spray shell, a first synchronous pulley is coaxially installed on the output shaft of the power motor, and a second synchronous pulley is coaxially installed on the corresponding connecting shaft, and the first synchronous pulley and the second synchronous pulley are connected by a synchronous transmission belt.

[0011] Furthermore, the slurry regulating member is a structure made of a hollow elastic rubber material, and its cross-section is an elliptical structure. A conducting channel connected to the inner cavity of the slurry regulating member is opened on a connecting shaft, and a medium conducting tube is rotatably connected to the connecting shaft. The medium conducting tube is connected to the inner cavity of the slurry regulating member through the conducting channel.

[0012] Furthermore, the wet elastic rolling mechanism includes two wet pressing rollers arranged side by side, and the circumferential surface of each wet pressing roller is covered with water seepage holes connected to the inner cavity of the wet pressing roller, and a water seepage layer is arranged on the outer circumferential surface of the wet pressing roller. Transfer rods are coaxially constructed at both ends of each wet pressing roller, and each transfer rod is rotatably connected to an elastic telescopic rod, and the elastic telescopic rod is fixed to the spray shell through an adapter plate. The transfer rods on the same side of the two wet pressing rollers are rotatably connected to the two ends of the connecting pipe, respectively, a joint pipe is installed on the connecting pipe, and solenoid valves are respectively installed at the two ends of the connecting pipe.

[0013] The present invention also discloses a method for applying the mortar spraying device to the inner wall of a tunnel as described above, comprising the following steps: Step 1. Drive the tunnel construction vehicle to the location of the tunnel to be sprayed; Step 2. Control the radial telescopic arm to drive the adjustable double-head spraying mechanism to move toward the inner wall of the tunnel to a predetermined distance; Step 3. Start the mortar pump to pump the mortar in the mortar mixing kettle into the adjustable double-head spraying mechanism, and then spray the mortar onto the tunnel wall by the adjustable double-head spraying mechanism; Step 4. During the spraying operation in step 3, the running member is controlled to move on the adapter frame so as to drive the adjustable double-head spraying mechanism to move along the circumferential direction of the tunnel wall, and the adjustable double-head spraying mechanism moves from one side of the tunnel wall to the other side; Step 5. During the spraying process, the wet elastic rolling mechanism performs wet rolling with water on the surface formed by the spraying; Step 6. When the adjustable double-head spraying mechanism moves from one side of the tunnel wall to the other side, the tunnel construction vehicle is set up to move forward a predetermined distance; then the running parts are controlled to move in the reverse direction on the adapter frame to perform the spraying operation synchronously; Step 7. Repeat steps 1 to 6 to continuously spray the surrounding surface of the tunnel.

[0014] Since the present invention adopts the above-mentioned structure, compared with the prior art, the technical progress achieved is that: the present invention drives the tunnel construction vehicle to travel in the tunnel, and stops the tunnel construction vehicle at the construction node; then controls the radial telescopic arm to move toward the inner wall of the tunnel, so that it drives the adjustable double-head spraying mechanism to approach the tied steel bar skeleton; then, controls the running piece to move on the adapter frame, so that the running piece drives the adjustable double-head spraying mechanism to move in an arc through the radial telescopic arm, and at the same time, controls the adjustable double-head spraying mechanism to perform spraying operations, so as to realize the circumferential continuous spraying of mortar on the surrounding wall of the tunnel; during the spraying process, since the adjustable double-head spraying mechanism is used for the spraying operation, the adjustable double-head spraying mechanism realizes primary spraying and secondary spraying, and forms a primary spraying layer and a secondary spraying layer on the inner wall of the tunnel respectively, and the secondary spraying layer is located outside the primary spraying layer. The wet elastic rolling mechanism of the present invention elastically rolls the primary spray layer in a wet state, so that the primary spray layer is gradually dense, and the bonding strength between the primary spray layer and the inner wall of the tunnel is improved; and because of the wet rolling, the wet elastic rolling mechanism is not easy to stick to the primary spray layer, avoiding the damage to the surface of the primary spray layer; the secondary spray layer of the present invention is used to supplement the primary spray layer to ensure that the tunnel surface is flat and smooth after spraying. At the same time, after the wet elastic rolling mechanism rolls the primary spray layer, a layer of liquid binding film will be formed on the surface of the primary spray layer. When the secondary spray layer is formed on the liquid binding film, due to the surface tension of the liquid binding film, the secondary spray layer with a thickness much lower than the primary spray layer is stabilized on the primary spray layer, and with the change of time, the liquid binding film gradually penetrates into the primary spray layer and the secondary spray layer, and finally the primary spray layer and the secondary spray layer are integrated. After completing the circumferential spraying of the area of ​​the tunnel, the present invention controls the tunnel construction vehicle to move to the next node along the length direction of the tunnel to continue to repeat the above-mentioned spraying operation. The present invention can also control the tunnel construction vehicle to move forward while spraying, so that the inner wall of the tunnel is continuously sprayed in a wavy and circuitous form, and adjacent spraying trajectories partially overlap to avoid incomplete spraying and ensure the adequacy of the spraying. In summary, the present invention can effectively improve the spraying efficiency, avoid the occurrence of slurry falling, and ensure that the thickness of the spraying layer is uniform, thereby improving the quality of the tunnel inner wall construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0016] In the attached picture: Figure 1 It is a structural schematic diagram of an embodiment of the present invention; Figure 2 This is a schematic structural diagram of the connection between the adapter frame and the running member according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of an embodiment of the present invention after removing the adapter frame and the running gear; Figure 4 for Figure 3 a side view of the structure shown; Figure 5 It is a structural schematic diagram of the connection between the adjustable double-head spraying mechanism and the wet elastic rolling mechanism according to an embodiment of the present invention; Figure 6 This is a schematic structural diagram of the connection between the radial telescopic arm, the sliding seat and the longitudinal driving mechanism according to an embodiment of the present invention; Figure 7 This is a schematic structural diagram of an adjustable double-head spraying mechanism according to an embodiment of the present invention; Figure 8 It is a cross-sectional view of the structure of the adjustable double-head spraying mechanism according to an embodiment of the present invention; Fig. 9 It is a schematic diagram of the connection between the slurry adjustment member and the angle adjustment component in the adjustable double-head spraying mechanism according to an embodiment of the present invention; Fig.10 It is a structural schematic diagram of the wet elastic rolling mechanism according to an embodiment of the present invention.

[0017] Labeled parts: 100-adapter, 101-adapter seat, 102-arch guide rail, 200-radial telescopic arm, 300-sliding seat, 301-seat body, 302-longitudinal slide rail, 400-adjustable double-head spraying mechanism, 401-spraying shell, 402-sliding bar, 403-slurry inlet, 404-spraying chamber, 405-spraying nozzle, 406-slurry regulating member, 407-conduction channel, 408-plate-shaped partition gate, 409-connecting ear, 410-conical spring, 411-medium conduction tube, 412-connecting shaft, 413-power motor, 414-first synchronous pulley, 415-second synchronous pulley, 416-synchronous transmission belt, 417-slurry conveying pipe, 418-transmission ear, 500-wet elastic rolling mechanism, 501-wet pressing roller, 502-adapter ring, 503-plug-in rod, 504-plug-in tube, 505-telescopic spring, 506-adapter plate, 507-connecting tube, 508-solenoid valve, 509-connector tube, 600-longitudinal driving mechanism, 601-driving motor, 602-longitudinal lead screw, 700-moving slide. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0019] The present invention discloses a mortar spraying device for use on the inner wall of a tunnel. Figure 1-10As shown, it includes an adapter frame 100, a running piece, a radial telescopic arm 200, a sliding seat 300, an adjustable double-head spraying mechanism 400, a longitudinal drive mechanism 600 and a wet elastic rolling mechanism 500. Among them, the adapter frame 100 can be detachably installed on the tunnel construction vehicle, and the running piece is installed on the adapter frame 100, and the running piece can move along the arc shape of the tunnel. The radial telescopic arm 200 is installed on the running piece, and the radial telescopic arm 200 is connected with the adjustable double-head spraying mechanism 400 through the sliding seat 300, the longitudinal drive mechanism 600 is installed between the adjustable double-head spraying mechanism 400 and the sliding seat 300, and the wet elastic rolling mechanism 500 is installed on the adjustable double-head spraying mechanism 400. The working principle and advantages of the present invention are as follows: the present invention drives a tunnel construction vehicle to travel in the tunnel, and stops the tunnel construction vehicle at the construction node; then controls the radial telescopic arm 200 to move toward the inner wall of the tunnel, so that it drives the adjustable double-head spraying mechanism 400 to approach the tied steel bar skeleton; thereafter, controls the running piece to move on the adapter frame 100, so that the running piece drives the adjustable double-head spraying mechanism 400 to move in an arc through the radial telescopic arm 200, and at the same time, controls the adjustable double-head spraying mechanism 400 to perform a spraying operation, so as to realize the circumferential continuous spraying of mortar on the surrounding wall of the tunnel; during the spraying process, since the adjustable double-head spraying mechanism 400 is used for the spraying operation, the adjustable double-head spraying mechanism 400 realizes primary spraying and secondary spraying, and forms a primary spraying layer and a secondary spraying layer on the inner wall of the tunnel, respectively, and the secondary spraying layer is located outside the primary spraying layer. The wet elastic rolling mechanism 500 of the present invention elastically rolls the primary spray layer in a wet state, so that the primary spray layer is gradually dense, and the bonding strength between the primary spray layer and the inner wall of the tunnel is improved; and because of the wet rolling, the wet elastic rolling mechanism 500 is not easy to stick to the primary spray layer, avoiding the damage to the surface of the primary spray layer; the secondary spray layer of the present invention is used to supplement the primary spray layer to ensure that the tunnel surface is flat and smooth after spraying. At the same time, after the wet elastic rolling mechanism 500 rolls the primary spray layer, a layer of liquid binding film will be formed on the surface of the primary spray layer. When the secondary spray layer is formed on the liquid binding film, due to the surface tension of the liquid binding film, the secondary spray layer with a thickness much lower than the primary spray layer is firmly fixed on the primary spray layer, and as time changes, the liquid binding film gradually penetrates into the primary spray layer and the secondary spray layer, and finally the primary spray layer and the secondary spray layer are integrated. After the circumferential spraying of the area of ​​the tunnel is completed, the present invention controls the tunnel construction vehicle to move to the next node along the length direction of the tunnel to continue to repeat the above-mentioned spraying operation. The present invention can also control the tunnel construction vehicle to move forward while spraying, so that the inner wall of the tunnel is continuously sprayed in a wavy and circuitous form, and adjacent spraying tracks partially overlap to avoid incomplete spraying and ensure the adequacy of spraying.In summary, the present invention can effectively improve the spraying efficiency, avoid the occurrence of slurry falling, ensure the uniform thickness of the spraying layer, and improve the quality of tunnel inner wall construction.

[0020] As a preferred embodiment of the present invention, Figure 2 As shown, the adapter frame 100 includes an adapter seat 101 and an arched guide rail 102, and the adapter seat 101 is detachably connected to the arched guide rail 102, and the adapter seat 101 is detachably connected to the tunnel construction vehicle. The running member of this embodiment is a moving slide 700, which is assembled on the arched guide rail 102 and can move along the extension direction of the arched guide rail 102. The shape of the arched guide rail 102 of this embodiment is the same as the shape of the cross section of the tunnel, and the size of the arched guide rail 102 is 1 / 5-1 / 4 of the size of the tunnel cross section, so that the running member drives the adjustable double-head spraying mechanism 400 to move more flexibly, and ensures the adequacy of the spraying of the adjustable double-head spraying mechanism 400 to avoid the occurrence of dead angles. The radial telescopic arm 200 of this embodiment generally adopts a hydraulic cylinder or a pneumatic cylinder.

[0021] As a preferred embodiment of the present invention, Figure 3-6 As shown, the sliding seat 300 includes a seat body 301 and a longitudinal slide rail 302, the seat body 301 is detachably connected to the end of the radial telescopic arm 200 away from the running member, the longitudinal slide rail 302 is constructed on the seat body 301, and the longitudinal slide rail 302 extends along the length direction of the tunnel, and the adjustable double-head spraying mechanism 400 is slidably assembled on the longitudinal slide rail 302. The longitudinal driving mechanism 600 of this embodiment includes a driving motor 601 and a longitudinal lead screw 602, wherein the driving motor 601 is mounted on the seat body 301, the longitudinal lead screw 602 is coaxially connected to the output shaft of the driving motor 601, and a transmission ear 418 is constructed at the lower part of the adjustable double-head spraying mechanism 400, and the longitudinal lead screw 602 is threadedly connected to the transmission ear 418. The working principle and advantages of this embodiment are as follows: this embodiment controls the action of the drive motor 601 to drive the longitudinal screw 602 to rotate. Under the transmission of the longitudinal screw 602, the adjustable double-head spraying mechanism 400 moves along the length direction of the tunnel. When the tunnel construction vehicle is not moving, the inner wall of the tunnel in the target area can be longitudinally sprayed, and the running parts can reciprocate on the arched guide rail 102, thereby increasing the range of spraying and avoiding frequent starting and stopping of the tunnel construction vehicle.

[0022] As a preferred embodiment of the present invention, Figure 3 , 5As shown in Figures 7 and 8, the adjustable double-head spraying mechanism 400 includes a spraying shell 401, on both sides of the lower part of the spraying shell 401 are symmetrically constructed with sliding bars 402, the spraying shell 401 is slidably connected with the longitudinal slide rail 302 through the two sliding bars 402, a spraying chamber 404 is formed in the spraying shell 401, and two spraying nozzles 405 are constructed at one end of the spraying shell 401 close to the tunnel wall, the two spraying nozzles 405 are arranged in a V shape, a slurry inlet 403 is opened on the spraying shell 401, the slurry inlet 403 is connected to the spraying chamber 404, and a slurry conveying pipe 417 is connected to the spraying chamber 404 through the slurry inlet 403. In this embodiment, the mortar is pressurized and supplied to the spraying chamber 404 through the slurry delivery pipe 417, and then ejected from the two spray nozzles 405. As the spray shell 401 is driven to move along the circumference of the tunnel, the two spray nozzles 405 achieve the purpose of secondary spraying of the inner wall of the tunnel, so that a primary spraying layer and a secondary spraying layer are formed on the inner wall of the tunnel in sequence.

[0023] As a preferred embodiment of the present invention, Figure 7-9As shown, a slurry regulating member 406 is provided in the spraying chamber 404, and the slurry regulating member 406 is located between the inlet ends of the two spraying nozzles 405, and connecting shafts 412 are respectively constructed at both ends of the slurry regulating member 406, and the axis of the slurry regulating member 406 coincides with the axis of the two connecting shafts 412, and the two connecting shafts 412 are respectively rotatably connected to the two opposite end walls of the spraying shell 401. One of the connecting shafts 412 is transmission-connected to the spray shell 401 through an angle adjustment assembly, and a plate-shaped dividing gate 408 is movably connected to one end of the spray shell 401 close to the tunnel wall, and the plate-shaped dividing gate 408 is located between the two spray nozzles 405, and one end of the plate-shaped dividing gate 408 extending into the spray chamber 404 elastically abuts against the outer surface of the slurry regulating member 406. The plate-shaped dividing gate 408 is used to separate the connecting parts of the two spray nozzles 405 close to the inner wall of the tunnel, avoiding the connection between the two spray nozzles 405 except for the inlet end, thereby affecting the different slurry outputs of the two spray nozzles 405, and failing to achieve the effect that the thickness of the primary spray layer is greater than the thickness of the secondary spray layer. In addition, the present embodiment can adjust the flow rate and pressure of the slurry entering the two spray nozzles 405 by adjusting the angle adjustment component. At the same time, the plate-shaped partition gate 408 also changes its position accordingly, so that it is always in a separated state, thereby adjusting the spraying amount and spraying pressure of the two spray nozzles 405, and adjusting the thickness of the primary spraying layer and the thickness of the secondary spraying layer, ensuring that it can be firmly combined and firmly attached to the inner wall of the tunnel. In the present embodiment, two connecting ears 409 are symmetrically constructed at one end of the plate-shaped partition gate 408 extending out of the spraying chamber 404. The two connecting ears 409 are constructed at both ends of the length direction of the end of the plate-shaped partition gate 408. Conical springs 410 are fixed on both sides of each connecting ear 409, and the other end of each conical spring 410 is fixedly connected to the outer wall of the spray shell 401. Under the action of the conical spring 410, the plate-shaped partition gate 408 of this embodiment is always elastically pressed on the corresponding surface of the slurry regulating member 406 at one end thereof extending into the spray chamber 404, thereby playing a role of partition. In this embodiment, a linear electric cylinder can also be used to replace the conical spring 410. A spring is installed on the cylinder rod of the linear electric cylinder. The spring is connected to the outer end of the plate-shaped partition gate 408. The cylinder body of the linear electric cylinder is connected to the outer surface of the spray shell 401, and the linear electric cylinder extends along the insertion direction of the plate-shaped partition gate 408. In this embodiment, during the adjustment of the slurry regulating member 406, the linear electric cylinder is controlled to move, and under the action of the spring, the end of the plate-shaped partition gate 408 is always elastically pressed on the slurry regulating member 406 according to a predetermined pressure, thereby improving the partition effect of the plate-shaped partition gate 408. The specific structure of the angle adjustment component of this embodiment is that the angle adjustment component includes a power motor 413, a first synchronous pulley 414, a second synchronous pulley 415 and a synchronous transmission belt 416.The power motor 413 is mounted on the spray shell 401, the first synchronous pulley 414 is coaxially mounted on the output shaft of the power motor 413, the second synchronous pulley 415 is coaxially mounted on the corresponding connecting shaft 412, and the first synchronous pulley 414 and the second synchronous pulley 415 are connected by a synchronous transmission belt 416. The specific structure of the slurry regulating member 406 in this embodiment is that the slurry regulating member 406 is a hollow elastic rubber material, the cross section of the slurry regulating member 406 is an elliptical structure, a conducting channel 407 is provided on one of the connecting shafts 412, the conducting channel 407 is connected to the inner cavity of the slurry regulating member 406, and a medium conducting pipe 411 is rotatably connected to the connecting shaft 412, and the medium conducting pipe 411 is connected to the inner cavity of the slurry regulating member 406 through the conducting channel 407. The working principle and advantages of this embodiment are as follows: in this embodiment, since the slurry regulating member 406 is a structure made of a hollow elastic rubber material, after the high-pressure medium is passed through the medium conducting tube 411 and the conducting channel 407 into the inner cavity of the slurry regulating member 406, the slurry regulating member 406 expands under the drive of the high-pressure medium, thereby changing the flow rate and pressure of the slurry entering the inlet ends of the two spray nozzles 405, so that the pressure and spraying amount of the mortar discharged from the two spray nozzles 405 are changed, thereby achieving the purpose of synchronously adjusting the thickness of the primary spray layer and the secondary spray layer. In this embodiment, the angle adjustment component is controlled to rotate the slurry adjustment member 406 in the spray chamber 404 by a certain angle, so that the flow rate of one of the spray nozzles 405 increases, and the flow rate of the other spray nozzle 405 decreases. The spray nozzle 405 with a large flow rate is used for spraying the primary spray layer, and the spray nozzle 405 with a small flow rate is used for spraying the secondary spray layer. After the running member moves from one end of the arched guide rail 102 to the other end, the running member is controlled to move in the opposite direction along the arched guide rail 102. At this time, the angle adjustment component is controlled to rotate the slurry adjustment member 406 in the spray chamber 404 until the spray flow rates of the two spray nozzles 405 are interchanged. In this way, in the process of the reverse movement of the adjustable double-head spraying mechanism 400, the purpose of spraying and forming the primary spray layer and the secondary spray layer in sequence is achieved. In this embodiment, the rotation angle of the slurry adjusting member 406 can be adjusted by the angle adjustment component, thereby adjusting the thickness of the primary spraying layer and the secondary spraying layer, that is, when the thickness of the primary spraying layer increases, the thickness of the secondary spraying layer decreases; conversely, when the thickness of the primary spraying layer decreases, the thickness of the secondary spraying layer increases. In this embodiment, the slurry adjusting member 406 is expanded by the medium or part of the medium in the slurry adjusting member 406 is discharged, thereby changing the expansion degree of the slurry adjusting member 406, thereby achieving the purpose of synchronously increasing or decreasing the thickness of the primary spraying layer and the secondary spraying layer.

[0024] As a preferred embodiment of the present invention, Figure 3 , 5As shown in Figure 10, the wet elastic rolling mechanism 500 includes two wet pressing rollers 501, which are arranged side by side at one end of the spray shell 401 close to the tunnel wall, and the two wet pressing rollers 501 are located between the two spray nozzles 405. The axis of each wet pressing roller 501 extends along the length direction of the tunnel. The circumference of each wet pressing roller 501 is covered with water seepage holes connected to the inner cavity of the wet pressing roller 501, and a water seepage layer is arranged on the outer circumference of the wet pressing roller 501. A transfer rod is coaxially constructed at both ends of each wet pressing roller 501, and an elastic telescopic rod is rotatably connected to each transfer rod, and the elastic telescopic rod is fixed to the spray shell 401 through a transfer plate 506. The transfer rods on the same side of the two wet pressing rollers 501 are rotatably connected to the two ends of the connecting pipe 507, and a joint pipe 509 is installed on the connecting pipe 507. Solenoid valves 508 are installed at the two ends of the connecting pipe 507. The elastic telescopic rod of this embodiment includes a plug-in rod 503, a plug-in tube 504, an adapter ring 502 and a telescopic spring 505, wherein the adapter ring 502 is rotatably mounted on the corresponding adapter rod, the plug-in rod 503 is constructed on the adapter ring 502, and one end of the plug-in rod 503 away from the adapter ring 502 is movably inserted in the plug-in tube 504, and the telescopic spring 505 is mounted on the outside of the plug-in rod 503, and the two ends of the telescopic spring 505 are respectively connected to the adapter ring 502 and the plug-in tube 504, and the plug-in tube 504 is fixed to the spray shell 401 through an adapter plate 506. The working principle and advantages of this embodiment are as follows: In this embodiment, liquid is passed into the wet pressing roller 501 through the connecting pipe 507, and the liquid penetrates into the water seepage layer through the water seepage hole, so that the water seepage layer is in a saturated state, and a layer of liquid film is formed on the surface of the water seepage layer, so that the wet pressing roller 501 will not stick when elastically rolling the primary spraying layer, and the surface of the primary spraying layer after rolling is ensured to be flat. In addition, this embodiment uses two wet pressing rollers 501 to roll the primary spraying layer twice, ensuring the density of the primary spraying layer and the flatness of its surface. In this embodiment, the electromagnetic valve 508 can be controlled to operate, so that the amount of liquid entering the wet pressing roller 501 is adjusted, so that the thickness of the liquid film should not be too thick, and the bonding strength between the secondary spraying layer and the primary spraying layer is ensured. In addition, the liquid film should not be too thin. When the liquid film is too thin, the wet pressing roller 501 will adhere to the surface of the primary spraying layer, affecting the quality of the mortar spraying construction.

[0025] The present invention also discloses a method for applying the mortar spraying device to the inner wall of a tunnel as described above, comprising the following steps: Step 1. Drive the tunnel construction vehicle to the location of the tunnel to be sprayed; Step 2. Control the radial telescopic arm 200 to drive the adjustable double-head spraying mechanism 400 to move toward the inner wall of the tunnel to a predetermined distance; Step 3. Start the mortar pump to pump the mortar in the mortar mixing kettle into the adjustable double-head spraying mechanism 400, and then spray the mortar onto the tunnel wall by the adjustable double-head spraying mechanism 400; Step 4. During the spraying operation in step 3, the running member is controlled to move on the adapter frame 100, so that the running member drives the adjustable double-head spraying mechanism 400 to move along the circumferential direction of the tunnel wall, and the adjustable double-head spraying mechanism 400 moves from one side of the tunnel wall to the other side; Step 5. During the spraying process, the wet elastic rolling mechanism 500 performs wet rolling with water on the surface formed by the spraying; Step 6. When the adjustable double-head spraying mechanism 400 moves from one side of the tunnel wall to the other side, the tunnel construction vehicle is set to move forward a predetermined distance; then the running parts are controlled to move in the reverse direction on the adapter frame 100 to perform the spraying operation synchronously; Step 7. Repeat steps 1 to 6 to continuously spray the surrounding surface of the tunnel.

[0026] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A mortar spraying device applied to the inner wall of a tunnel, characterized in that: It includes an adapter frame that can be detachably installed on a tunnel construction vehicle, a running member that can move along the arc shape of the tunnel is installed on the adapter frame, a radial telescopic arm is installed on the running member, the radial telescopic arm is connected to an adjustable double-head spraying mechanism through a sliding seat, a longitudinal driving mechanism is installed between the adjustable double-head spraying mechanism and the sliding seat, and a wet elastic rolling mechanism is installed on the adjustable double-head spraying mechanism.

2. A mortar spraying device applied to the inner wall of a tunnel according to claim 1, characterized in that: The adapter frame includes an adapter seat detachably connected to the arched guide rail, and the adapter seat is detachably connected to the tunnel construction vehicle; the running member is a moving slide, which is assembled on the arched guide rail and moves along the arched guide rail.

3. The mortar spraying device applied to the inner wall of a tunnel according to claim 1, characterized in that: The sliding seat comprises a seat body detachably connected to the radial telescopic arm, a longitudinal slide rail extending along the length direction of the tunnel is constructed on the seat body, and the adjustable double-head spraying mechanism is slidably assembled on the longitudinal slide rail.

4. The mortar spraying device applied to the inner wall of a tunnel according to claim 3 is characterized in that: The longitudinal drive mechanism comprises a drive motor mounted on a seat body, a longitudinal lead screw is coaxially connected to the output shaft of the drive motor, and the longitudinal lead screw is threadedly connected to the lower part of the adjustable double-head spraying mechanism.

5. The mortar spraying device applied to the inner wall of a tunnel according to claim 3, characterized in that: The adjustable double-head spraying mechanism includes a spray shell with sliding bars symmetrically constructed on both sides of the lower part. The spray shell is slidably connected to the longitudinal slide rail through the two sliding bars. A spray chamber is formed in the spray shell. Two V-shaped spray nozzles are constructed at one end of the spray shell close to the tunnel wall. A slurry inlet connected to the spray chamber is opened on the spray shell, and the slurry delivery pipe is connected to the spray chamber through the slurry inlet.

6. The mortar spraying device applied to the inner wall of a tunnel according to claim 5, characterized in that: A slurry regulating member is provided in the spraying chamber and between the inlet ends of the two spray nozzles. Connecting shafts coinciding with the axis thereof are respectively constructed at both ends of the slurry regulating member. The two connecting shafts are rotatably connected to the two opposite end walls of the spraying shell respectively. One of the connecting shafts is transmission-connected to the spraying shell through an angle adjustment assembly. A plate-shaped dividing gate is movably connected to one end of the spraying shell close to the tunnel peripheral wall and between the two spray nozzles. One end of the plate-shaped dividing gate extending into the spraying chamber elastically abuts against the outer surface of the slurry regulating member.

7. The mortar spraying device applied to the inner wall of a tunnel according to claim 6, characterized in that: The angle adjustment assembly includes a power motor installed on the spray shell, a first synchronous pulley is coaxially installed on the output shaft of the power motor, and a second synchronous pulley is coaxially installed on the corresponding connecting shaft. The first synchronous pulley and the second synchronous pulley are connected by a synchronous transmission belt.

8. The mortar spraying device applied to the inner wall of a tunnel according to claim 7, characterized in that: The slurry regulating member is a structure made of a hollow elastic rubber material, and its cross-section is an elliptical structure. A conducting channel connected to the inner cavity of the slurry regulating member is opened on a connecting shaft, and a medium conducting tube is rotatably connected to the connecting shaft. The medium conducting tube is connected to the inner cavity of the slurry regulating member through the conducting channel.

9. The mortar spraying device applied to the inner wall of a tunnel according to claim 5, characterized in that: The wet elastic rolling mechanism includes two wet pressing rollers arranged side by side, the circumference of each wet pressing roller is covered with water seepage holes connected to the inner cavity of the wet pressing roller, a water seepage layer is arranged on the outer circumference of the wet pressing roller, and a transfer rod is coaxially constructed at both ends of each wet pressing roller, each of the transfer rods is rotatably connected with an elastic telescopic rod, and the elastic telescopic rod is fixed to the spray shell through a transfer plate, the transfer rods on the same side of the two wet pressing rollers are rotatably connected to the two ends of the connecting pipe, a joint pipe is installed on the connecting pipe, and solenoid valves are installed at the two ends of the connecting pipe.

10. A method for applying a mortar spraying device to a tunnel inner wall as claimed in any one of claims 1 to 9, characterized in that: The steps include: Step 1. Drive the tunnel construction vehicle to the location of the tunnel to be sprayed; Step 2. Control the radial telescopic arm to drive the adjustable double-head spraying mechanism to move toward the inner wall of the tunnel to a predetermined distance; Step 3. Start the mortar pump to pump the mortar in the mortar mixing kettle into the adjustable double-head spraying mechanism, and then spray the mortar onto the tunnel wall by the adjustable double-head spraying mechanism; Step 4. During the spraying operation in step 3, the running member is controlled to move on the adapter frame so as to drive the adjustable double-head spraying mechanism to move along the circumferential direction of the tunnel wall, and the adjustable double-head spraying mechanism moves from one side of the tunnel wall to the other side; Step 5. During the spraying process, the wet elastic rolling mechanism performs wet rolling with water on the surface formed by the spraying; Step 6. When the adjustable double-head spraying mechanism moves from one side of the tunnel wall to the other side, the tunnel construction vehicle is set up to move forward a predetermined distance; then the running parts are controlled to move in the reverse direction on the adapter frame to perform the spraying operation synchronously; Step 7. Repeat steps 1 to 6 to continuously spray the surrounding surface of the tunnel.

Images