Polishing unit, polishing device and polishing method for tunnel secondary lining template

Abstract

The invention relates to a grinding unit, a grinding device and a grinding method for a tunnel secondary lining formwork. The grinding unit comprises a main frame, and the bent shape of the main frame is matched with the shape of the outer surface of the secondary lining formwork; a motor and a gear transmission mechanism are arranged in the main frame, the gear transmission mechanism comprises a driving gear and a plurality of driven gears, the driving gear is connected with an output shaft of the motor, the driven gears are arranged in the length direction of the main frame to form a driven gear row, and brushes are connected to the driven gears; the vertical supporting assembly is a telescopic mechanism, the lower end of the vertical supporting assembly is connected with the top of the main frame, and the upper end of the vertical supporting assembly is used for being connected with the tunnel wall of the tunnel; the two ends of the transverse supporting assembly are used for being connected with the side face of the main frame and a plug plate of the secondary lining trolley respectively, and the transverse supporting assembly is perpendicular to the vertical supporting assembly. The polishing device comprises a plurality of polishing units which are connected in sequence. The secondary lining formwork is ground in the mode that the grinding device is fixed and the secondary lining trolley moves, the structure of the secondary lining formwork is simplified, and the grinding efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of grinding devices, and in particular relates to a grinding unit, a grinding device and a grinding method for a tunnel secondary lining template. Background Art

[0002] In tunnel construction, the cleaning of the outer surface of the secondary lining formwork is of great significance to the quality of concrete pouring. The traditional method of relying on manual handheld cleaning tools such as brooms and scrapers has obvious disadvantages. Its work efficiency is low. Due to the large area of ​​the formwork, manual cleaning is time-consuming and labor-intensive, which greatly increases time and labor costs and slows down the construction progress. The cleaning effect is also not ideal. It is difficult to clean thoroughly and evenly. Residual debris can easily cause quality problems such as pockmarks and honeycombs in the secondary lining concrete, affecting the durability and aesthetics of the tunnel. In addition, the tunnel is closed and poorly ventilated. Manual cleaning exposes construction workers to dust pollution and faces health and safety risks.

[0003] In the currently disclosed prior art, the device for grinding the secondary lining template generally completes the grinding and cleaning by walking along the outer surface of the secondary lining template. The walking methods mainly include the following: (1) For example, CN210530867U discloses an attached automatic cleaning and grinding tunnel secondary lining trolley template device, which adopts an electric-driven magnetic walking trolley to walk along the secondary lining template to achieve template grinding; (2) For example, CN118181070A discloses a tunnel lining trolley template grinding device, which adopts a ring track outside the secondary lining template, and the grinding machine can move along the ring track to grind the outer surface of the secondary lining template. In addition, there are also CN115351663A and CN219027033U adopting the second method, and CN117484345A adopting the first method.

[0004] In the above-mentioned grinding methods, corresponding structures are required to realize the movement of the grinding device on the outer surface of the second lining formwork. The structure is relatively complex and the cost is high. In addition, since the contact area between the grinding device used and the second lining formwork is small, it takes a long time to complete the grinding, which slows down the construction progress. Summary of the invention

[0005] The purpose of the present invention is to provide a grinding unit, a grinding device and a grinding method for a tunnel secondary lining formwork, wherein the device can be fixed on the tunnel wall and remain motionless, and the outer surface of the secondary lining formwork is ground during the movement of the secondary lining trolley, and after the grinding is completed, it is transferred to the secondary lining trolley and moves forward with the secondary lining trolley, thereby improving the grinding efficiency and cleaning effect of the secondary lining formwork.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a grinding unit for a tunnel secondary lining template, comprising a main frame, the main frame is curved in an arc shape in the length direction, and its curved shape is consistent with the shape of the outer surface of the secondary lining template; a motor and a gear transmission mechanism are arranged in the main frame, the gear transmission mechanism comprises a driving gear and a plurality of driven gears, the driving gear is connected to the output shaft of the motor, and the plurality of driven gears are arranged along the length direction of the main frame to form a driven gear row, each driven gear is connected to a brush, and the brush is located below the main frame; A vertical support assembly, which is a telescopic mechanism, the lower end of which is connected to the top of the main frame, and the upper end of which is used to connect to the wall of the tunnel; A transverse support assembly, one end of which is connected to a side surface of the main frame, and the other end is connected to a plug plate on the secondary lining trolley; The lateral support assembly and the vertical support assembly are perpendicular to each other.

[0007] The beneficial effects are as follows: the grinding unit of the present invention is a component unit of the grinding device, which can be spliced ​​in sequence along the circumference of the secondary lining formwork and fixed on the tunnel wall through a vertical support assembly, so that the secondary lining formwork can be ground by keeping the grinding device stationary and the secondary lining trolley moving, and the contact area between the grinding unit and the secondary lining formwork is large, especially after the grinding device is formed, the secondary lining formwork can be covered in the circumferential direction, so that the secondary lining trolley only needs to move once to complete the grinding operation of the secondary lining formwork, which greatly improves the grinding efficiency and also improves the efficiency of the secondary lining construction.

[0008] The vertical support assembly adopts a telescopic mechanism. After grinding is completed, the telescopic mechanism can control the main frame of the grinding unit to fall and dock with the horizontal support assembly fixed on the trolley head plate. After docking, the vertical support assembly is manually removed from the hole wall, reducing the manual workload of recovering the grinding device.

[0009] The vertical support assembly and the horizontal support assembly are vertically arranged, so that no matter whether the grinding device is installed on the hole wall or on the plug plate, there is no need to adjust the posture of the main frame, which further simplifies the installation and disassembly process of the grinding device.

[0010] Furthermore, an oil tank is arranged in the main frame, and a plurality of oil outlet pipes are connected to the oil tank. The oil outlet pipes extend from the bottom of the main frame and are provided with oil injection nozzles.

[0011] The beneficial effect is that oil or a release agent can be sprayed onto the polished area through the oil spray nozzle, so as to facilitate the demoulding of the formwork after the second lining construction.

[0012] Furthermore, the lateral support assembly adopts a telescopic mechanism or a support rod with flange plates at both ends.

[0013] The beneficial effect is that the main function of the lateral support assembly is to fix the main frame on the plugging plate of the secondary lining trolley, so either a telescopic mechanism or a non-telescopic structure such as a support rod can be used. When a telescopic mechanism is used, the telescopic part can be retracted to align with the side of the main frame, which is convenient for better connection.

[0014] As an option, the telescopic mechanism includes a fixed outer cylinder, an electromagnet, a spring and a telescopic rod body; the telescopic rod body is movably arranged in the fixed outer cylinder, one end of the telescopic rod body extending out of the fixed outer cylinder is connected to the main frame, one end of the telescopic rod body located in the fixed outer cylinder is connected to the spring, and the other end of the spring is connected to the inner end surface of the fixed end of the fixed outer cylinder, the electromagnet is located around the spring, and the magnetic force generated by the electromagnet when it is energized can attract the telescopic rod body to retract into the fixed outer cylinder.

[0015] The beneficial effect is that a simple and easy telescopic mechanism controlled by an electromagnet is provided, and the telescopic range of the telescopic rod can be achieved by controlling the current.

[0016] Furthermore, an end plate is provided on one end of the telescopic rod body facing the electromagnet, and the diameter of the end plate is larger than the diameter of the telescopic rod body.

[0017] The beneficial effect is that the telescopic rod body can be better telescoped by using the end plate with a larger diameter in cooperation with the electromagnet.

[0018] As another option, the telescopic mechanism is a hydraulic rod or an electric push rod.

[0019] The beneficial effect is that two other telescopic mechanisms are provided for users to choose according to their needs, thereby expanding the application scope of the present invention.

[0020] Specifically, the driven gear row is provided with two rows, and adjacent driven gears in the two rows are meshed and connected.

[0021] The beneficial effect is that more brushes can be arranged to further increase the contact area with the second lining template and improve the grinding efficiency.

[0022] The present invention also proposes a grinding device for a tunnel secondary lining template, comprising a plurality of grinding units as described above, wherein the plurality of grinding units are connected in sequence along the circumference of the secondary lining template.

[0023] The beneficial effect is that the second lining formwork is polished by the grinding device being stationary while the second lining trolley is moving. The contact area between the grinding device and the second lining formwork is large, and the second lining formwork can be covered in the circumferential direction. In this way, the second lining trolley only needs to move once to complete the polishing operation of the second lining formwork, which greatly improves the polishing efficiency and also improves the efficiency of the second lining construction.

[0024] The present invention further proposes a grinding method for a tunnel secondary lining template, which adopts the grinding device and comprises the following steps: In the first step, after the demoulding of the first ring and the second lining is completed, the vertical support assembly of the grinding unit is anchored on the hole wall by anchors, and the horizontal support assembly is fixed on the outside of the plugging plate of the second lining trolley and is not connected to the main frame. Multiple grinding units are arranged in sequence along the circumference of the hole wall to form a grinding device; The second step is to control the vertical support components of each grinding unit to extend and retract upward, driving the main frame to move toward the cave wall as a whole; The third step is to start the motor to drive the brush to rotate, and then start the second lining trolley to move forward. During the process of moving forward, the rotating brush polishes the outer surface of the second lining template; The fourth step is to turn off the motor in the main frame after grinding is completed, reverse the second lining trolley back to the initial position, and lower the main frame of the grinding unit to the corresponding lateral support assembly position, connect the main frame with the corresponding lateral support assembly, and remove the connection between the vertical support assembly and the hole wall.

[0025] The beneficial effect is that the second lining formwork is polished by the grinding device being stationary while the second lining trolley is moving. The contact area between the grinding device and the second lining formwork is large, and the second lining formwork can be covered in the circumferential direction. In this way, the second lining trolley only needs to move once to complete the polishing operation of the second lining formwork, which greatly improves the polishing efficiency and also improves the efficiency of the second lining construction.

[0026] Furthermore, when the polishing unit is provided with an oil tank and an oil spray nozzle, during the polishing process, the oil spray nozzle sprays oil or a release agent onto the polished area.

[0027] The beneficial effect is that oil or a release agent can be sprayed onto the polished area through the oil spray nozzle, so as to facilitate the demoulding of the formwork after the second lining construction.

[0028] The beneficial effects of the present invention are as follows: the present invention uses the form of fixing the grinding device and moving the second lining trolley to grind the outer surface of the second lining template. Since the grinding device does not need to move, its structure can be simplified. The main frame on the grinding device is bent to match the shape of the second lining template, so that the brushes are arranged at the bottom of the main frame, which can effectively fit the outer surface of the second lining template and be consistent with the circumferential size of the second lining template. Therefore, the grinding of the entire second lining template can be completed during one trip of the second lining trolley, which significantly improves the grinding efficiency.

[0029] The vertical support assembly of the present invention adopts various forms of telescopic mechanisms to connect with the cave wall, and the lifting and lowering of the main frame can be controlled as needed, so that the main frame can be better positioned to the position required for grinding. For example, when the height of the second lining trolley is not enough, the main frame can be lowered a greater distance to facilitate the grinding of the second lining template by the brush; and when the second lining trolley is at a higher position, the amplitude of the main frame's descent can be reduced to avoid hindering the rotation of the brush. In addition, the setting of the telescopic mechanism can also facilitate the recovery of each grinding unit. After the grinding is completed, the second lining trolley needs to return. After returning to its position, the telescopic mechanism can drop the main frame so that the main frame and the transverse support assembly connected to the plug plate on the second lining trolley are aligned, which facilitates the main frame to be directly connected to the transverse support assembly, thereby avoiding the need to remove the main frame from the cave wall and then connect it to the transverse support assembly, simplifying the recovery operation of the grinding unit and reducing the workload of the operator.

[0030] The lateral support assembly of the present invention adopts a fixed mechanism or a telescopic mechanism. When the telescopic mechanism is adopted, after the grinding unit falls, it can be positioned through the lateral telescopic mechanism and quickly connected to the side of the main frame of the grinding unit, thereby reducing the requirements for the moving position accuracy of the secondary lining trolley and further reducing the control difficulty.

[0031] The vertical support assembly and the horizontal support assembly of the present invention are arranged perpendicular to each other. When the grinding unit is connected and switched with the hole wall and the plugging plate, the posture of the main frame does not need to be changed, which further simplifies the fixing process of the grinding unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic structural diagram of the grinding unit described in Example 1 of the present invention; Figure 2 It is a schematic diagram of the grinding unit in Embodiment 1 of the present invention being fixed on the tunnel wall; Figure 3 This is a front view of a grinding unit in Example 1 of the present invention; Figure 4 It is a front view of another grinding unit in Embodiment 1 of the present invention; Figure 5 is a schematic structural diagram of the grinding unit described in Example 2 of the present invention; Figure 6 is a schematic structural diagram of the grinding unit described in Example 3 of the present invention; Figure 7 Schematic diagram of the structure of the grinding unit in Embodiment 4 of the present invention; Figure 8 is a schematic diagram of the grinding device in the grinding process in Example 6 of the present invention; Fig. 9 It is a structural schematic diagram of a rotating plugging plate in the prior art; Markings in the figure: 1, vertical support assembly, 2, main frame, 3, horizontal support assembly, 4, fixed outer cylinder, 5, electromagnet, 6, spring, 7, telescopic rod body, 8, motor, 9, gear transmission mechanism, 10, fuel injection nozzle, 11, brush, 12, fuel tank, 13, support rod, 14, hydraulic rod; 100. Tunnel wall; 200. Secondary lining formwork; 300. Secondary lining trolley; 301. Trolley web; 401. Fixed part; 402. Rotating part. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the invention in any way.

[0034] Example 1 See attached Figure 1 , 2 As shown, a grinding unit for a tunnel secondary lining formwork comprises a vertical support assembly 1, a main frame 2 and a transverse support assembly 3. The vertical support assembly 1 and the transverse support assembly 3 are telescopic mechanisms of the same structure, and the support assembly is divided into vertical and transverse according to its installation position and installation posture. The vertical support assembly 1 is installed on the top of the main frame 2. When grinding is required, the vertical support assembly 1 connects the grinding device to the tunnel wall 100. The transverse support assembly 3 is installed on the side of the main frame 2. After grinding is completed, the transverse support assembly 3 connects the grinding device to the plug plate of the secondary lining trolley.

[0035] like Figure 1 As shown, taking the vertical support assembly 1 as an example, its structure includes a fixed outer cylinder 4, an electromagnet 5, a spring 6 and a telescopic rod 7. One end of the fixed outer cylinder 4 is a fixed end, which is used to be detachably connected to the cave wall through an anchor. The telescopic rod 7 is slidably arranged in the fixed outer cylinder 4, and the telescopic rod 7 extends from the other end of the fixed outer cylinder 4, and is used to be detachably connected to the top of the main frame 2 through bolts. An end plate with a diameter larger than the diameter of the telescopic rod 7 is fixed to the end of the telescopic rod 7 located inside the fixed outer cylinder 4, and a spring 6 is arranged between the end plate and the inner end surface of the fixed outer cylinder 4, and an electromagnet 5 is arranged around the spring 6. The magnetic force generated by the electromagnet 5 after being energized can act on the end plate to attract the telescopic rod 7 to move, and the distance moved by the telescopic rod 7 can be controlled by controlling the magnitude of the current.

[0036] For the lateral support assembly 3, the fixed end of the fixed outer cylinder 4 is used for detachable connection with the plug plate of the secondary lining trolley through bolts; the end of the telescopic rod body 7 extending from the fixed outer cylinder 4 is used for detachable connection with the side of the main frame 2 through bolts.

[0037] Furthermore, a shaft sleeve is provided on the fixed outer cylinder 4, and the telescopic rod body 7 is inserted into the shaft sleeve. The setting of the shaft sleeve can reduce the sliding friction of the telescopic rod body 7 and the wear on the fixed outer cylinder 4, and at the same time play a guiding role in the sliding of the telescopic rod body 7.

[0038] The main frame 2 is a strip frame with a rectangular cross section, which is bent into an arc in the length direction of the main frame 2 and matches the shape of the outer surface of the second lining template. A motor 8 and a gear transmission mechanism 9 are arranged inside the main frame 2. The gear transmission mechanism 9 includes a driving gear 901 and a driven gear row composed of a plurality of driven gears 902 arranged along the length direction of the main frame 2. The driven gear row is arranged in one row or two rows along the width direction of the main frame 2. Each driven gear 902 is rotatably mounted on the bottom plate of the main frame 2. A rotating shaft is connected below the driven gear 902, and the rotating shaft passes downward from the bottom plate of the main frame 2. A brush 11 is connected to the lower end of the rotating shaft. Since the main frame 2 is arc-shaped in the length direction, the brush 11 on the driven gear row can be fitted into a curved surface that matches the shape of the outer surface of the second lining template, so as to better contact the outer surface of the second lining template and reduce cleaning dead angles. The long strip structure of the main frame 2 can effectively increase the contact area between the brush 11 and the second lining template, and further through the splicing of multiple grinding units, the second lining template can be covered in the circumferential direction.

[0039] Furthermore, an oil tank 12 is provided in the main frame 2. An oil pipe connected to the oil tank 12 passes through the bottom plate of the main frame 2. An oil spray nozzle 10 is provided at the end of the oil pipe. The oil spray nozzle 10 sprays the oil or release agent in the oil tank 12 onto the cleaned second lining template.

[0040] Furthermore, the plurality of oil spray nozzles 10 are provided and arranged at intervals along the length direction of the main frame 2. Preferably, the orientations of the plurality of oil spray nozzles 10 are not completely the same, so that the oil spraying areas of the plurality of oil spray nozzles 10 can cover the outer surface of the second lining template.

[0041] Specifically, Figure 3 As shown, the main frame 2 of the grinding unit described in this embodiment is relatively short, and each main frame 2 is provided with a vertical support assembly 1 and a horizontal support assembly 3. When in use, the main frames 2 of multiple grinding units are sequentially arranged along the circumference of the secondary lining template, so that the length of the multiple grinding units after splicing can cover the circumferential area of ​​the outer surface of the secondary lining template. Or, as Figure 4 As shown, the grinding unit has a longer main frame 2, on which two or more vertical support assemblies 1 and transverse support assemblies 3 are arranged. Similarly, when in use, the main frames 2 of multiple grinding units are arranged sequentially along the circumference of the second lining template.

[0042] Example 2 The difference between this embodiment and embodiment 1 is that the structure of the lateral support assembly 3 is different from that of the vertical support assembly 1. Figure 5 As shown, the lateral support assembly 3 of this embodiment is a support rod 13 with flange plates at both ends, wherein the flange plate at one end is detachably connected to the side of the main frame 2 by bolts, and the flange plate at the other end is detachably connected to the plug plate of the secondary lining trolley by bolts. The support rod 13 only serves to fix the main frame 2 from the side and does not have a telescopic function.

[0043] Example 3 The difference between this embodiment and embodiment 2 is that the vertical support assembly 1 adopts a telescopic mechanism such as a hydraulic rod or an electric push rod, and a connecting flange is provided at the fixed end of the telescopic mechanism for anchoring and connecting with the tunnel wall, and the telescopic end of the telescopic mechanism is detachably connected to the top of the main frame 2 through the connecting flange. Figure 6 As shown, in this embodiment, a hydraulic rod 14 is used to connect with the main frame 2.

[0044] Example 4 The difference between this embodiment and embodiment 3 is that the lateral support assembly 3 adopts a telescopic mechanism such as a hydraulic rod or an electric push rod, and connecting flanges are provided at both ends of the telescopic mechanism, which are respectively connected to the plug plate on the secondary lining trolley and the side of the main frame 2 by bolts. Figure 7 As shown, in this embodiment, the lateral support assembly 3 uses a hydraulic rod 14 as a telescopic mechanism.

[0045] Example 5 A grinding device for a tunnel secondary lining template comprises a plurality of grinding units as described in any one of embodiments 1 to 4, wherein the plurality of grinding units are sequentially arranged along the circumference of the secondary lining template.

[0046] Example 6 A method for grinding a tunnel secondary lining template, such as Figure 8 As shown, the method uses the grinding device described in Example 1 or Example 2, and the specific steps are as follows: The first step is to grind the secondary lining template 200 on the secondary lining trolley 300 after demoulding the first ring secondary lining. The grinding unit is removed from the plugging plate of the secondary lining trolley 300, and the vertical support assembly 1 of the grinding unit is anchored to the tunnel wall by anchors. The grinding units are sequentially arranged and fixed along the circumference of the tunnel wall 100 to form a grinding device. After the grinding unit is removed, the horizontal support assembly 3 is kept fixed to the outer side of the plugging plate of the secondary lining trolley 300. In the second step, the electromagnet 5 of the grinding unit is energized to generate magnetic force, which attracts the telescopic rod 7 and drives the main frame 2 to move toward the cave wall 100 as a whole; The third step is to keep the electromagnet 5 powered on, start the motor 8, and drive the brush 11 to rotate; then start the secondary lining trolley 300 to move forward. During the process of moving forward, the rotating brush 11 polishes the outer surface of the secondary lining template 200, and the oil spray nozzle 10 sprays oil or a release agent on the outer surface of the secondary lining template 200; The fourth step is to turn off the motor 8 in the main frame 2 after the grinding is completed, and stop the oil spraying from the oil nozzle 10; the second lining trolley 300 reverses back to the initial position, the electromagnet 5 is powered off, and the main frame 2 of the grinding unit falls to the corresponding lateral support assembly 3 position, connect the main frame 2 with the corresponding lateral support assembly 3, and remove the connection between the vertical support assembly 1 and the cave wall 100 to complete the grinding.

[0047] When installing the grinding unit on the tunnel wall 100, the installation position is located in front of the secondary lining trolley 300, so as to avoid construction in the narrow space between the secondary lining formwork 200 and the tunnel wall 100, making it easier to install and fix. After the secondary lining trolley returns, it is also convenient for the main frame 2 to be docked and fixed with the transverse support assembly 3 left on the plug plate.

[0048] During the grinding process, the current of the electromagnet 5 can be adjusted to control the magnetic force and adjust the pressure of the brush 11 on the second lining template 200 to ensure the grinding effect.

[0049] Example 7 A method for grinding a tunnel secondary lining template, the method using the grinding device described in Example 3, the specific steps are as follows: The first step is to grind the second lining template 200 on the second lining trolley 300 after demoulding the first ring second lining. The grinding unit is removed from the plugging plate of the second lining trolley 300, and the fixed end of the hydraulic rod 14 of the grinding unit is anchored on the tunnel wall by an anchor. The grinding units are sequentially arranged along the circumference of the tunnel wall 100 and connected to the tunnel wall to form a grinding device. After the grinding unit is removed, the support rod 13 is kept fixed on the outer side of the plugging plate of the second lining trolley 300. In the second step, the telescopic end of the hydraulic rod 14 is retracted, driving the main frame 2 to move toward the cave wall 100 as a whole; The third step is to keep the hydraulic rod 14 in the retracted state, start the motor 8, and drive the brush 11 to rotate; then start the secondary lining trolley 300 to move forward. During the forward movement, the rotating brush 11 polishes the outer surface of the secondary lining template 200, and the oil spray nozzle 10 sprays oil or a release agent on the outer surface of the secondary lining template 200; The fourth step is to turn off the motor 8 in the main frame 2 and stop the oil spraying from the oil nozzle 10 after the grinding is completed; the secondary lining trolley 300 is reversed back to the initial position, and the telescopic end of the hydraulic rod 14 is extended to drop the main frame 2 to the corresponding lateral support assembly 3 position, so as to facilitate the connection between the main frame 2 and the corresponding lateral support assembly 3. After the connection, the connection between the hydraulic rod 14 and the cave wall 100 is removed to complete the grinding.

[0050] In the methods of Example 5 and Example 6, before grinding begins, the grinding units are transferred one by one from the plugging plate of the secondary lining trolley to the hole wall, and after grinding is completed, the grinding units fall one by one from the hole wall to the connection position on the plugging plate. Since the bending shape of the main frame 2 of each grinding unit is designed according to the shape of the secondary lining template 200, the main frame 2 cannot be installed on the same circumference when it is installed on the plugging plate of the secondary lining trolley due to the interference of adjacent main frames 2. For this reason, the installation positions of each main frame 2 on the plugging plate need to be staggered in the vertical direction. Specifically, any two adjacent lateral support assemblies 3 fixed on the plugging plate are arranged in a staggered manner, so that the adjacent main frames 2 are staggered up and down, which can solve the problem of mutual interference.

[0051] It should be noted that in Examples 5 and 6, the plugging plate on the secondary lining trolley is a rotating plugging plate commonly used in the art, such as Fig. 9 As shown, the rotary plugging plate generally includes a lower fixed portion 401 and an upper rotating portion 402, wherein the fixed portion 401 is fixed on the trolley belly plate 301, and the grinding unit is fixed to the fixed portion 401 at the lower portion of the plugging plate, which does not affect the rotation function of the rotating portion 402. Similar structures can also refer to the published patent CN 209011852 U. Therefore, the grinding device of the present invention does not involve the modification of the secondary lining trolley structure, and the existing secondary lining trolley can also adopt the grinding device of the present invention.

[0052] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Those skilled in the art should understand that the specific implementation modes of the present invention may be modified or replaced by equivalents with reference to the above embodiments. Any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention are within the scope of protection of the pending claims.

Claims

1. A grinding unit for a tunnel secondary lining formwork, characterized in that: It includes a main frame, which is curved in an arc shape in the length direction, and its curved shape is consistent with the shape of the outer surface of the secondary lining template; a motor and a gear transmission mechanism are arranged in the main frame, and the gear transmission mechanism includes a driving gear and a plurality of driven gears, the driving gear is connected to the output shaft of the motor, and the plurality of driven gears are arranged along the length direction of the main frame to form a driven gear row, and each driven gear is connected to a brush, and the brush is located below the main frame; A vertical support assembly, which is a telescopic mechanism, the lower end of which is connected to the top of the main frame, and the upper end of which is used to connect to the wall of the tunnel; A transverse support assembly, one end of which is used to connect to a side surface of the main frame, and the other end is used to connect to the plug plate on the secondary lining trolley; The lateral support assembly and the vertical support assembly are perpendicular to each other.

2. The grinding unit according to claim 1, characterized in that: An oil tank is arranged inside the main frame, and a plurality of oil outlet pipes are connected to the oil tank. The oil outlet pipes extend from the bottom of the main frame and are provided with oil injection nozzles.

3. The grinding unit according to claim 1 or 2, characterized in that: The lateral support assembly adopts a telescopic mechanism or a support rod with flange plates at both ends.

4. The grinding unit according to claim 3, characterized in that: The telescopic mechanism includes a fixed outer cylinder, an electromagnet, a spring and a rod body; the rod body is movably arranged in the fixed outer cylinder, one end of the rod body extending out of the fixed outer cylinder is connected to the main frame, one end of the rod body located in the fixed outer cylinder is connected to the spring, and the other end of the spring is connected to the inner end surface of the fixed end of the fixed outer cylinder. The electromagnet is located around the spring, and the magnetic force generated by the electromagnet when it is energized can attract the rod body to retract into the fixed outer cylinder.

5. The grinding unit according to claim 4, characterized in that: An end plate is arranged on one end of the rod body facing the electromagnet, and the diameter of the end plate is greater than the diameter of the rod body.

6. The grinding unit according to claim 3, wherein the telescopic mechanism is a hydraulic rod or an electric push rod.

7. The grinding unit according to claim 1, characterized in that: The driven gear rows are provided with two rows, and the adjacent driven gears in the two rows are meshed and connected.

8. A grinding device for a tunnel secondary lining formwork, characterized in that: It comprises a plurality of grinding units as described in any one of claims 1 to 7, and the plurality of grinding units are connected in sequence along the circumference of the second lining template.

9. A method for grinding a tunnel secondary lining formwork, characterized in that: The method uses the grinding device according to claim 8, comprising the following steps: In the first step, after the demoulding of the first ring and the second lining is completed, the vertical support assembly of the grinding unit is anchored on the hole wall by anchors, and the horizontal support assembly is fixed on the outside of the plugging plate of the second lining trolley and is not connected to the main frame. Multiple grinding units are arranged in sequence along the circumference of the hole wall to form a grinding device; The second step is to control the vertical support components of each grinding unit to extend and retract upward, driving the main frame to move toward the cave wall as a whole; The third step is to start the motor to drive the brush to rotate, and then start the second lining trolley to move forward. During the process of moving forward, the rotating brush polishes the outer surface of the second lining template; The fourth step is to turn off the motor in the main frame after grinding is completed, reverse the second lining trolley back to the initial position, and lower the main frame of the grinding unit to the corresponding lateral support assembly position, connect the main frame with the corresponding lateral support assembly, and remove the connection between the vertical support assembly and the hole wall.

10. The grinding method according to claim 9, characterized in that: When the polishing unit is provided with an oil tank and an oil spray nozzle, during the polishing process, the oil spray nozzle sprays oil or a release agent onto the polished area.

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