Small-section tunnel lining safety protection construction structure

Abstract

The invention relates to the technical field of tunnel lining protection, in particular to a small-section tunnel lining safety protection construction structure which comprises a middle main driving unit, a center walking mechanism is installed at the bottom of the middle main driving unit, and multi-fulcrum supporting mechanisms are arranged on the front side and the rear side of the middle main driving unit correspondingly. Each multi-fulcrum supporting mechanism is driven by the middle main driving unit, each supporting end of each multi-fulcrum supporting mechanism abuts against the inner wall of an arc-shaped lining in a tunnel, and grouting holes allowing grout to be injected are formed in the front side and the rear side of each arc-shaped lining at the top correspondingly; and a slurry treatment unit is arranged on one side of each multi-fulcrum supporting mechanism. According to the method, when the arc-shaped lining is installed in the small-section tunnel, primary fixing is completed through expansion bolts, and in order to guarantee the supporting and protecting effect when the tunnel is used as a pressure type desilting tunnel, the stability and effective protecting strength of a supporting structure formed in the tunnel are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel lining protection, in particular to a small-section tunnel lining safety protection construction structure. Background Art

[0002] The design and construction of small-section tunnels require comprehensive consideration of multiple factors, including geological conditions, hydraulic conditions, construction technology, application requirements, etc. Through reasonable design and careful construction, the safe, stable and efficient operation of small-section tunnels can be ensured.

[0003] Among them, small-section tunnels are often used as pressurized sand-drainage tunnels to flush away silt deposited in reservoirs or to empty reservoirs in preparation for air defense inspections. Since the interior is filled with water and there is a certain internal water pressure, it is generally necessary to design lining safety protection inside the circular section to ensure the stability and safety of the entire tunnel structure under pressure in the later stage. The construction is generally completed with the help of construction equipment.

[0004] After searching, a patent document with patent application number CN214366094U discloses a small-section hydraulic tunnel lining construction structure, whose main structure includes a bottom plate arranged at the bottom of the hydraulic tunnel, side plates are arranged on both sides of the bottom plate along the side walls of the hydraulic tunnel, guide rails are arranged on the bottom plate along the direction of the hydraulic tunnel, a construction support frame is arranged on the guide rail through walking wheels, a curved side formwork is arranged on the side of the construction support frame through a side telescopic mechanism, and a curved top formwork is arranged on the top of the construction support frame through a top telescopic mechanism. Both the side formwork and the top formwork are composed of a number of steel formworks, which are spliced ​​and combined to form a hydraulic tunnel construction formwork in combination with the side plates, a square warehouse opening is arranged on the side formwork with a warehouse door, and a circular warehouse opening is arranged on the top formwork.

[0005] It can be seen from the above structure that it mainly converts the hydraulic system of the traditional lining trolley into a manual screw so that it can be effectively combined with the fixed combined steel formwork. However, when fixing the steel formwork, only the formwork frame is used to complete the pressure positioning. When using this structure to deal with a pressurized sand-draining tunnel, there are the following problems: First, it is difficult to form a uniform pressure of the entire formwork frame on the inner wall formwork of the tunnel by relying on the mechanical pressure on the two arc-shaped ends of the formwork frame, especially when the formwork size is large, the middle part of the formwork lacks force and the support effect is poor; second, the structure of the split formwork using side formwork and top formwork in the prior art has certain defects in the overall support capacity, especially when supporting a pressurized sand-draining tunnel with a full water structure, there are great safety hazards.

[0006] Based on this, the present invention designs a new structure that can effectively assist in the safe protection construction of a compressed sand-draining tunnel lining, so as to better solve the problems existing in the prior art. Summary of the invention

[0007] The present invention solves one of the above technical problems, and the technical solution adopted is: a small-section tunnel lining safety protection construction structure, including a central total drive unit, a central walking mechanism is installed at the bottom of the central total drive unit, and multi-support mechanisms are respectively arranged on the front and rear sides of the central total drive unit, and each of the multi-support mechanisms is driven by the central total drive unit. Each support end of each multi-support mechanism is respectively abutted against the inner wall of the arc lining in the tunnel, and each arc lining is fixed to the inner wall of the tunnel by expansion bolts and an annular slurry filling cavity is reserved between the inner wall of the tunnel, and grouting holes for slurry injection are respectively arranged on the front and rear sides of each arc lining at the top, and a slurry processing unit is respectively arranged on one side of each multi-support support mechanism, and the slurry processing unit is used to grout into the corresponding grouting hole above it, and an end walking mechanism is arranged at the bottom of each slurry processing unit, and each end walking mechanism is in a synchronous motion state with the central walking mechanism.

[0008] In any of the above schemes, it is preferred that the central total drive unit includes a fixed central gear box, a driving gear and a driven gear are arranged at intervals in the gear cavity of the central gear box, a rotating gear is meshed above the middle of the driving gear and the driven gear, and the rotating gear is meshed with the driving gear and the driven gear at the same time, a rigid center tube is fixedly inserted in the central cavity of the rotating gear, front and rear ends of the rigid center tube are movably extended to the outside of the gear cavity and are respectively connected and cooperated with the multi-point support mechanism, and a position control motor is fixedly installed at the end of the gear shaft of the driving gear, and the position control motor is fixed inside the gear cavity.

[0009] In any of the above schemes, it is preferred that the central walking mechanism includes two central wheel frames fixedly installed at an interval at the bottom of the central gear box, a central dual-axis motor is fixedly arranged between the two central wheel frames, the ends of the two output shafts of the central dual-axis motor are respectively connected to the central wheel axles, the ends of the central wheel axles are movably passed through the mounting holes on the central wheel frames and are respectively connected to the central wheels, and the central dual-axis motor is fixedly connected to the central gear box at the bottom of the central total drive unit through the central motor frame.

[0010] In any of the above schemes, it is preferred that the multi-point support mechanism includes the horizontally arranged rigid central tube, the center of the rigid central tube is provided with a central slurry delivery pipe cavity for the slurry to pass through, the two ends of the central slurry delivery pipe cavity are respectively connected with the interior of the slurry processing unit at its corresponding position, circumferential positioning components are respectively installed on the outer sides of the front and rear ends of the rigid central tube, a plurality of radial support members are fixedly installed on the outer side wall of the circumferential positioning component at uniform intervals along its circumference, the outer end of each of the radial support members is used to abut the arc lining at its current position, and an end slurry delivery pipe cavity connected with the central slurry delivery pipe cavity is provided at the center of the circumferential positioning component, and the end of the end slurry delivery pipe cavity extends to the interior of the slurry processing unit at its corresponding position.

[0011] In any of the above schemes, it is preferred that the circumferential adjustment component includes a disc planetary carrier fixedly mounted on the outer side wall of the end portion of the rigid central tube, a plurality of planetary gear shafts are evenly fixed on the end face of the disc planetary carrier along its circumference, a planetary gear is cooperatively mounted on each of the planetary gear shafts, an outer gear ring is arranged on the periphery of each of the planetary gears, the outer gear ring and each of the planetary gears are mutually meshed, a central sun gear mutually meshed therewith is arranged on the inner side of each of the planetary gears, a sun gear shaft is arranged at the center of the central sun gear, the sun gear shaft is a hollow structure with both ends passed through, and the internal cavity is the end slurry delivery pipe cavity, the inner end of the sun gear shaft is movably and sealingly clamped in the central slurry delivery pipe cavity of the rigid central tube, the sun gear shaft is coaxially arranged with the rigid central tube and there is relative rotation, the slurry flows along the central slurry delivery pipe cavity and the end slurry delivery pipe cavity in the conveying state, a protective bin is integrally formed on the outer side wall of the outer gear ring, and protective end covers are arranged at both ends of the protective bin.

[0012] In any of the above schemes, it is preferred that the radial support member includes a radial telescopic cylinder fixedly mounted on the outer wall of the protective bin of the circumferential positioning assembly, the end of the piston rod of each radial telescopic cylinder is fixedly mounted with a support frame, a rigid support sphere is arranged in the mounting cavity of the support frame, both ends of the rigid support sphere are respectively movably inserted into the axial hole corresponding to the support frame through the center axis thereof, and each of the rigid support spheres is used to press against the inner wall of the arc lining at its corresponding position in the working state.

[0013] In any of the above schemes, it is preferred that the slurry processing unit includes a slurry storage box horizontally arranged on one side of the circumferential positioning assembly, the end walking mechanism is installed at the bottom of the slurry storage box, a slurry storage cavity is arranged inside the slurry storage box, the end of the end slurry delivery pipe cavity is connected to the inside of the slurry storage cavity, a slurry mixer is installed inside the slurry storage cavity, the slurry mixer is driven by a mixing motor fixedly installed on the outer wall of the slurry storage box, and a slurry mixer is installed on the outer wall at the slurry discharge hole on the other side of the slurry storage cavity. A grouting pipe with a grouting pump is installed, and a retractable bellows section is provided on the top of the grouting pipe. A grouting rigid pipe is connected to the top of the bellows section, and an adjusting platform is fixedly installed on the outer wall of the grouting rigid pipe. Grouting control electric cylinders are fixed at intervals on the top of the slurry storage box. The top of the piston rod of each grouting control electric cylinder is fixed on the adjusting platform and is used to drive the adjusting platform and the grouting rigid pipe thereon to rise and fall. The grouting rigid pipe is inserted into the grouting hole at the corresponding position when working.

[0014] In any of the above schemes, it is preferred that a slurry guide pipe is installed on the end face side wall of the slurry storage box located at the rear end, the interior of the slurry guide pipe is connected to the interior of the slurry storage cavity, and the feed end of the slurry guide pipe is connected to the downstream grouting equipment through a connecting flange.

[0015] In any of the above schemes, it is preferred that the end walking mechanism includes two end wheel frames fixedly installed at an interval at the bottom of the slurry storage box, an end dual-axis motor is fixedly arranged between the two end wheel frames, the ends of the two output shafts of the end dual-axis motor are respectively connected to the end wheel axles, the ends of the end wheel axles are movably passed through the mounting holes on the end wheel frames and are respectively connected to the end wheels, and the end dual-axis motor is fixedly connected to the bottom of the slurry storage box through the end motor frame.

[0016] In any of the above schemes, it is preferred that a blocking sleeve is sleeved and fitted on the outer wall of the expansion bolt between the inner wall of the tunnel and each of the arc-shaped linings, and the blocking sleeve is located in the slurry filling cavity. When slurry is injected into the slurry filling cavity, the slurry solidifies and bonds the arc-shaped lining and the inner wall of the tunnel.

[0017] In any of the above schemes, it is preferred that the slurry injected into the slurry filling cavity is filled in the slurry filling cavity in a continuously flowing state and forms a grouting bonding layer structure.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. In the present invention, expansion bolts are used to complete the initial fixation when installing the arc lining inside the small-section tunnel. In order to ensure the support and protection effect when the tunnel is used as a pressurized sand-draining tunnel, the present invention designs a small-section tunnel lining safety protection construction structure to cooperate with the support installation and grouting operations in the slurry filling cavity, thereby ensuring the stability of the support structure formed inside the tunnel and the effective protection strength.

[0020] 2. The small-section tunnel lining safety protection construction structure of the present invention can continuously move along the extension direction of the small-section tunnel during construction. When the arc lining installation construction is required, it can be moved into place. After it is in place, support positioning and grouting operations are carried out at the same time to achieve the filling of waterproof slurry inside the slurry filling cavity and the reinforcement of the original arc lining support, thereby improving the safety of tunnel support and waterproof protection.

[0021] 3. In the present invention, when each arc lining is pressed and positioned, radial expansion support can be performed according to the inner diameter of the current tunnel. At the same time, circumferential rotation and pressing can be performed as needed during support, thereby ensuring stable pressing of the arc lining during grouting operations, reducing the occurrence of arc lining falling off due to excessive slurry pressure, and improving safety during construction.

[0022] 4. In the present invention, when grouting reinforcement is carried out, the top construction method of the two ends of the arc lining is adopted, and grouting can be simultaneously performed from the grouting holes at both ends. The waterproof slurry can be injected from the top of the slurry filling cavity and flow quickly and fill the entire slurry filling cavity, thereby forming a reinforcement layer connecting the inner wall of the tunnel and the arc lining. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, the elements or components are not necessarily drawn according to the actual scale.

[0024] Figure 1 It is a schematic diagram of the structure of the present invention under internal installation state.

[0025] Figure 2 for Figure 1 Schematic diagram of the internal partial cross-sectional structure.

[0026] Figure 3 It is a schematic diagram of the three-dimensional structure of the two multi-support point support mechanisms in the present invention.

[0027] Figure 4 It is a schematic diagram of the three-dimensional structure of the circumferential positioning assembly of the present invention.

[0028] Figure 5 It is a schematic side structural diagram of the slurry processing unit of the present invention.

[0029] Figure 6 It is a schematic diagram of the internal structure of the middle main drive unit of the present invention.

[0030] Figure 7 It is a side structural schematic diagram of the multi-support point support mechanism of the present invention.

[0031] Figure 8 It is a partially enlarged schematic diagram of the internal structure of the rigid central tube and the central wheel shaft of the present invention in cooperation and insertion.

[0032] In the figure, 1, tunnel; 2, arc lining; 3, expansion bolt; 4, slurry filling cavity; 5, grouting hole; 6, middle gear box; 7, gear cavity; 8, driving gear; 9, driven gear; 10, rotating gear; 11, rigid central tube; 12, position control motor; 13, central wheel frame; 14, central dual-axis motor; 15, central wheel axle; 16, central wheel; 17, central motor frame; 18, central slurry delivery pipe cavity; 19, end slurry delivery pipe cavity; 20, protective bin; 21, radial telescopic cylinder; 22, support frame; 23, rigid support sphere; 24, slurry storage box; 25, slurry storage cavity; 26, Slurry mixer; 27. Mixing motor; 28. Slurry discharge hole; 29. ​​Grouting pump; 30. Slurry discharge pipe; 31. Corrugated pipe section; 32. Grouting rigid pipe; 33. Adjustment platform; 34. Grouting control electric cylinder; 36. Slurry guide pipe; 37. End wheel frame; 38. End double-axis motor; 39. End wheel axle; 40. End wheel; 41. End motor frame; 42. Blocking sleeve; 43. Disc planetary frame; 44. Planetary wheel axle; 45. Planetary gear; 46. Outer ring gear; 47. Center sun gear; 48. Sun wheel axle; 49. Protective end cover; 50. Semicircular clamping ring; 51. Limiting inner convex. DETAILED DESCRIPTION

[0033] The following is a detailed description of the embodiments of the technical solution of the present invention in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present invention. Figure 1-Figure 8 as shown in .

[0034] Embodiment 1: A small-section tunnel lining safety protection construction structure comprises a central total drive unit, a central walking mechanism is installed at the bottom of the central total drive unit, and multi-point support mechanisms are respectively arranged on the front and rear sides of the central total drive unit, and each of the multi-point support mechanisms is driven by the central total drive unit, and each supporting end of each of the multi-point support mechanisms is respectively abutted against the inner wall of the arc lining 2 in the tunnel 1, and each of the arc linings 2 is fixed to the inner wall of the tunnel 1 by expansion bolts 3 and an annular slurry filling cavity 4 is reserved between the inner wall of the tunnel 1, and grouting holes 5 for slurry injection are respectively arranged on the front and rear sides of each of the arc linings 2 at the top, and a slurry processing unit is respectively arranged on one side of each of the multi-point support mechanisms, and the slurry processing unit is used to grout into the corresponding grouting hole 5 above it, and an end walking mechanism is arranged at the bottom of each of the slurry processing units, and each of the end walking mechanisms is in a synchronous motion state with the central walking mechanism.

[0035] The small-section tunnel lining safety protection construction structure as a whole can move and position along the direction of the tunnel 1 when the walking mechanisms at each end and the central walking mechanism move synchronously. Before the construction of this structure, it is necessary to wait for the installation and positioning of each arc lining 2 on the inner wall of the tunnel 1 to be completed in advance inside the tunnel 1. When the arc lining 2 is installed, start this construction structure to enter the tunnel 1, start the walking mechanisms at each end and the central walking mechanism to move synchronously, and drive the entire structure to shift to the middle section of the arc lining 2 as needed in the moving state. After moving into place, starting the middle total drive unit can drive the multi-point support mechanism at both ends to rotate as needed. After rotation, control its radial expansion and contraction and press against the inner wall of each arc lining 2 at the corresponding position, so as to ensure the stable support of each arc lining 2 structure at the current position. Fine-tuning displacement can be achieved in the support state. After displacement, the slurry treatment unit is aligned with the grouting hole 5 above, and the alignment is controlled. Then, the external grouting equipment starts to grout into the slurry treatment unit at the rear end. The slurry flows to the slurry treatment unit at the front end under the action of the channel, waiting for grouting.

[0036] During grouting, the slurry processing unit is started, and the slurry continuously enters the slurry filling cavity 4. The grouting parameters are observed and controlled, and the grouting is stopped after the slurry filling cavity 4 is filled with slurry.

[0037] During the grouting process, the stability of the support of the arc lining 2 inside the tunnel 1 can be ensured by relying on the multi-point support mechanism.

[0038] In any of the above schemes, it is preferred that the central total drive unit includes a fixed central gear box 6, and a driving gear 8 and a driven gear 9 are arranged at intervals in the gear cavity 7 of the central gear box 6. A rotating gear 10 is meshed above the middle of the driving gear 8 and the driven gear 9, and the rotating gear 10 is meshed with the driving gear 8 and the driven gear 9 at the same time. A rigid center tube 11 is fixedly inserted in the central cavity of the rotating gear 10, and the front and rear ends of the rigid center tube 11 are both movable to pass through the outside of the gear cavity 7 and are respectively connected and cooperated with the multi-point support mechanism, and a position control motor 12 is fixedly installed at the end of the gear shaft of the driving gear 8, and the position control motor 12 is fixed inside the gear cavity 7.

[0039] It should be noted that when the central total drive unit in the present invention is working, the positioning motor 12 in the central gear box 6 can drive the driving gear 8 to rotate. When the driving gear 8 rotates, it can drive the rotating gear 10 and the rigid center tube 11 fixed thereon to follow the rotation. During the rotation, the power can be transmitted to the circumferential positioning components at both ends thereof, thereby driving each multi-point support mechanism to rotate and adjust the fixed axis under the action of the circumferential positioning components. When the adjustment is in place, the various radial support members on the multi-point support mechanism are controlled to extend radially, thereby achieving the purpose of effectively supporting the arc lining 2.

[0040] In any of the above schemes, it is preferred that the central walking mechanism includes two central wheel frames 13 fixedly installed at an interval at the bottom of the central gear box 6, and a central dual-axis motor 14 is fixedly arranged between the two central wheel frames 13, and the ends of the two output shafts of the central dual-axis motor 14 are respectively connected to the central wheel axle 15, and the ends of the central wheel axle 15 are movable through the mounting holes on the central wheel frames 13 and are respectively connected to the central wheels 16, and the central dual-axis motor 14 is fixedly connected to the central gear box 6 at the bottom of the central total drive unit through the central motor frame 17.

[0041] The central walking mechanism is used to drive the entire structure on its top to move. When the central walking mechanism is working, the central dual-axis motor 14 is started to operate. When the central dual-axis motor 14 operates, it can drive the central wheels 16 on both sides to rotate, thereby driving the entire structure to move.

[0042] In any of the above schemes, it is preferred that the multi-support support mechanism includes the horizontally arranged rigid central tube 11, and a central slurry delivery pipe cavity 18 for slurry to pass through is arranged at the center of the rigid central tube 11, and both ends of the central slurry delivery pipe cavity 18 are respectively connected with the interior of the slurry processing unit at its corresponding position, and circumferential positioning components are respectively installed on the outer sides of the front and rear ends of the rigid central tube 11, and a plurality of radial support members are fixedly installed on the outer side wall of the circumferential positioning component at uniform intervals along its circumference, and the outer end of each radial support member is used to abut the arc lining 2 at its current position, and an end slurry delivery pipe cavity 19 connected with the central slurry delivery pipe cavity 18 is arranged at the center of the circumferential positioning component, and the end of the end slurry delivery pipe cavity 19 extends to the interior of the slurry processing unit at its corresponding position.

[0043] The multi-point support mechanism in the present invention mainly relies on the central rigid center tube 11 as the input of the rotational driving force. When the rigid center tube 11 rotates, it can drive the circumferential adjustment component fixed to its end to rotate along with it. Since the radial support members arranged on the outer wall of the circumferential adjustment component can rotate along with it, rotation adjustment is performed in the circumferential direction of the cross section of the tunnel 1. When adjusted into place, the arc lining 2 at the corresponding position is pressed against by the extension of each radial support member. When each radial support member is extended, it is independent of each other, and their respective extension lengths do not affect each other.

[0044] In addition, considering that the support is for the subsequent grouting action, the central grouting pipe cavity 18 is connected with the end grouting pipe cavity 19. After the connection, the slurry can be introduced through the end grouting pipe cavity 19 at the rear side and transported through the central grouting pipe cavity 18 into the front central grouting pipe cavity 18, and then enter the interior of the slurry processing unit to wait for grouting.

[0045] In any of the above schemes, it is preferred that the radial support member includes a radial telescopic cylinder 21 fixedly mounted on the outer wall of the protective bin 20 of the circumferential positioning assembly, and the end of the piston rod of each of the radial telescopic cylinders 21 is fixedly mounted with a support frame 22, and a rigid support ball 23 is arranged in the mounting cavity of the support frame 22, and the two ends of the rigid support ball 23 are respectively movably inserted into the axial holes corresponding to the support frame 22 through their center axes, and each of the rigid support balls 23 is used to press against the inner wall of the arc lining 2 at its corresponding position in the working state.

[0046] When the radial support member is working, the extension or contraction of the radial telescopic cylinder 21 can drive the rigid support ball 23 at its end to press against the inner wall of the arc lining 2 at the current position, thereby supporting the arc lining 2. In addition, since the current rigid support ball 23 can rotate around the axis hole, it is relatively convenient and quick to adjust the rotation displacement.

[0047] In any of the above schemes, it is preferred that the slurry processing unit includes a slurry storage box 24 horizontally arranged on one side of the circumferential positioning assembly, the end walking mechanism is installed at the bottom of the slurry storage box 24, a slurry storage cavity 25 is arranged inside the slurry storage box 24, the end of the end slurry delivery pipe cavity 19 is connected to the inside of the slurry storage cavity 25, a slurry mixer 26 is installed inside the slurry storage cavity 25, the slurry mixer 26 is driven by a mixing motor 27 fixedly installed on the outer wall of the slurry storage box 24, and a belt is installed on the outer wall at the slurry discharge hole 28 on the other side of the slurry storage cavity 25. There is a grouting pipe 30 with a grouting pump 29, and a retractable bellows section 31 is arranged on the top of the grouting pipe 30. A grouting rigid pipe 32 is connected to the top of the bellows section 31. An adjusting platform 33 is fixedly installed on the outer wall of the grouting rigid pipe 32. Grouting control electric cylinders 34 are fixed at intervals on the top of the slurry storage box 24. The top of the piston rod of each grouting control electric cylinder 34 is fixed on the adjusting platform 33 and is used to drive the adjusting platform 33 and the grouting rigid pipe 32 thereon to rise and fall. The grouting rigid pipe 32 is inserted into the grouting hole 5 at the corresponding position during operation.

[0048] The slurry processing unit designed in the present invention mainly relies on the slurry storage box 24 to temporarily receive the waterproof slurry delivered during operation. The waterproof slurry is temporarily stored in the slurry storage chamber 25 of the slurry storage box 24, and the fluidity of the slurry is maintained under the action of the slurry mixer 26. When the support is completed, the grouting pump 29 is started. Under the action of the grouting pump 29, the slurry in the slurry storage chamber 25 can be continuously transported upward and enter the grouting hole 5 through the corrugated pipe section 31 and the grouting rigid pipe 32. The slurry enters the slurry filling chamber 4 through the grouting hole 5 and fills the slurry filling chamber 4. Finally, the slurry is solidified to form a reinforcement layer for consolidating the arc lining 2 and the side wall of the tunnel 1.

[0049] The extension and retraction of the grouting control electric cylinder 34 can be controlled according to the inner diameter of the current tunnel 1, thereby controlling the lifting and lowering of the grouting rigid pipe 32 connected to the top of the grouting control electric cylinder 34, and finally driving the top of the grouting rigid pipe 32 to extend to the grouting hole 5 for grouting.

[0050] In any of the above schemes, it is preferred that a slurry guide pipe 36 is installed on the end face side wall of the slurry storage box 24 located at the rear end, the interior of the slurry guide pipe 36 is connected to the interior of the slurry storage chamber 25, and the feed end of the slurry guide pipe 36 is connected to the downstream grouting equipment through a connecting flange.

[0051] The slurry storage box 24 at the rear side is mainly used to receive external slurry by means of the slurry guide pipe 36 installed thereon, so that the slurry enters the slurry storage cavity 25 for temporary storage.

[0052] In any of the above schemes, it is preferred that the end walking mechanism includes two end wheel frames 37 fixedly installed at an interval at the bottom of the slurry storage box 24, and an end dual-axis motor 38 is fixedly arranged between the two end wheel frames 37, and the ends of the two output shafts of the end dual-axis motor 38 are respectively connected to end wheel axles 39, and the ends of the end wheel axles 39 are movably passed through the mounting holes on the end wheel frames 37 and are respectively connected to the end wheels 40, and the end dual-axis motor 38 is fixedly connected to the bottom of the slurry storage box 24 through the end motor frame 41.

[0053] When the end walking mechanism of the present invention is working, the end wheels 40 on the end wheel axles 39 are driven to rotate by the operation of the end dual-axis motor 38, so as to achieve a state of synchronous and speed operation with the center wheel 16.

[0054] In any of the above schemes, it is preferred that a blocking sleeve 42 is sleeved and fitted on the outer wall of the expansion bolt 3 between the inner wall of the tunnel 1 and each of the arc-shaped linings 2, and the blocking sleeve 42 is located in the slurry filling cavity 4. When slurry is injected into the slurry filling cavity 4, the slurry solidifies and bonds the arc-shaped lining 2 and the inner wall of the tunnel 1.

[0055] When the arc lining 2 is installed and fixed by using the expansion bolts 3, in order to ensure that an additional slurry filling cavity 4 is formed between the arc lining 2 and the inner wall of the tunnel 1, after the slurry is filled in the slurry filling cavity 4, the arc lining 2 and the inner wall of the tunnel 1 can be effectively bonded and fixed.

[0056] In any of the above schemes, it is preferred that the slurry injected into the slurry filling cavity 4 is filled in the slurry filling cavity 4 in a continuously flowing state and forms a grouting bonding layer structure.

[0057] Embodiment 2: Compared with Embodiment 1, this embodiment is different in that it also includes the following technical features:

[0058] In any of the above schemes, it is preferred that the circumferential adjustment component includes a disc planet carrier 43 fixedly mounted on the outer side wall of the end of the rigid center tube 11, and a plurality of planetary gear shafts 44 are evenly fixed along the circumference on the end face of the disc planet carrier 43, and a planetary gear 45 is mounted on each of the planetary gear shafts 44, and an outer gear ring 46 is arranged on the periphery of each of the planetary gears 45, and the outer gear ring 46 and each of the planetary gears 45 are meshed with each other, and a central sun gear 47 meshed with it is arranged on the inner side of each of the planetary gears 45, and the central sun gear 47 meshed with it is arranged on the inner side of each of the planetary gears 45. 7 is provided with a sun gear shaft 48 in the center of the movable clamping connection. The sun gear shaft 48 is a hollow structure with two ends passed through and the internal cavity is the end slurry delivery tube cavity 19. The inner end of the sun gear shaft 48 is movably and sealingly clamped in the central slurry delivery tube cavity 18 of the rigid center tube 11. The sun gear shaft 48 and the rigid center tube 11 are coaxially arranged and can rotate relative to each other. The slurry flows along the central slurry delivery tube cavity 18 and the end slurry delivery tube cavity 19 in the conveying state. A protective bin 20 is integrally formed on the outer side wall of the outer gear ring 46, and protective end covers 49 are provided at both ends of the protective bin 20.

[0059] It should be noted that: when the circumferential adjustment component is working, it relies on the rigid center tube 11 to input power. At this time, the center sun gear 47 is fixed, the outer ring gear 46 rotates as a passive part, and the disc planetary carrier 43 serves as an active part. When the rigid center tube 11 drives the disc planetary carrier 43 to operate, it can drive the disc planetary carrier 43 to rotate. During the rotation of the disc planetary carrier 43, each planetary gear 45 can rotate along the center sun gear 47. At this time, the outer ring gear 46 follows the rotation. When the outer ring gear 46 rotates, it can drive its circumferential radial support parts to rotate.

[0060] The sun gear shaft 48 and the rigid center tube 11 are plugged in and matched with each other. During the plugging process, there is relative rotation and the contact parts are kept relatively sealed, so as to ensure the sealing and leakage prevention when the waterproof slurry flows inside.

[0061] Semicircular clamping rings 50 are respectively installed on the upper and lower ends of the rigid center tube 11. A limiting inner protrusion 51 is provided on the inner wall of the semicircular clamping ring 50. The limiting inner protrusion 51 is used to cooperate with the annular groove on the outer wall of the sun gear shaft 48 at its corresponding position. The two semicircular clamping rings 50 are fixed to the ends of the rigid center tube 11.

[0062] When the rigid center tube 11 moves forward, the sun gear shaft 48 can be driven to move forward synchronously under the action of the limiting inner protrusion 51 .

[0063] Specific working principle: The construction structure as a whole can move and position along the direction of tunnel 1 under the synchronous movement of the walking mechanisms at each end and the central walking mechanism. Before the construction of this structure, it is necessary to wait for the installation and positioning of each arc lining 2 on the inner wall of tunnel 1 to be completed in advance inside tunnel 1.

[0064] After the arc lining 2 is installed, the construction structure is started to enter the tunnel 1, and the walking mechanisms at each end are started to move synchronously with the central walking mechanism, and the entire structure is driven to shift to the middle section of the arc lining 2 as needed during the movement.

[0065] After moving into position, starting the middle main drive unit can drive the multi-point support mechanisms at both ends to rotate as needed. After rotation, the radial expansion and contraction is controlled to press against the inner walls of each arc lining 2 at the corresponding position, thereby ensuring stable support for each arc lining 2 structure at the current position, and fine-tuning displacement can be achieved under the support state.

[0066] After the displacement, the slurry processing unit is aligned with the grouting hole 5 above, and the alignment is controlled. Then, the external grouting equipment starts to grout the slurry processing unit at the rear end. The slurry flows to the front end of the slurry processing unit under the action of the channel, waiting for grouting. During grouting, the slurry processing unit is started, and the slurry continuously enters the slurry filling cavity 4. The grouting parameters are observed and controlled, and the grouting is stopped after the slurry filling cavity 4 is filled with slurry.

[0067] During the grouting process, the stability of the support of the arc lining 2 inside the tunnel 1 can be ensured by relying on the multi-point support mechanism.

[0068] Specifically, the grouting relies on the work of the slurry processing unit. When the slurry processing unit works, it mainly relies on the slurry storage box 24 to temporarily receive the waterproof slurry delivered. The waterproof slurry is temporarily stored inside the slurry storage cavity 25 of the slurry storage box 24, and the fluidity of the slurry is maintained under the action of the slurry mixer 26.

[0069] When the support is completed, the grouting pump 29 is started. Under the action of the grouting pump 29, the slurry inside the slurry storage chamber 25 can be continuously transported upward and enter the grouting hole 5 through the corrugated pipe section 31 and the grouting rigid pipe 32. The slurry enters the slurry filling chamber 4 through the grouting hole 5 and fills the slurry filling chamber 4. Finally, the slurry is solidified to form a reinforcement layer for consolidating the arc lining 2 and the side wall of the tunnel 1.

[0070] The extension and retraction of the grouting control electric cylinder 34 can be controlled according to the inner diameter of the current tunnel 1, thereby controlling the lifting and lowering of the grouting rigid pipe 32 connected to the top of the grouting control electric cylinder 34, and finally driving the top of the grouting rigid pipe 32 to extend to the grouting hole 5 for grouting.

[0071] In summary, it can be seen that in the present invention, when the arc lining 2 is installed inside the small-section tunnel 1, the expansion bolts 3 are used to complete the initial fixation. In order to ensure the support and protection effect when the tunnel 1 is used as a pressurized sand-draining tunnel 1, the present invention designs a small-section tunnel lining safety protection construction structure to cooperate with the support installation and grouting operations in the slurry filling cavity 4, so as to ensure the stability of the support structure formed inside the tunnel 1 and the effective protection strength; the small-section tunnel lining safety protection construction structure can continuously move along the extension direction of the small-section tunnel 1 during construction, and can cooperate to move into place when the arc lining 2 is installed and constructed. After it is in place, support positioning and grouting operations are carried out at the same time, so as to realize the filling of the waterproof slurry inside the slurry filling cavity 4 and the original The reinforcement of the support of the arc lining 2 improves the support safety and waterproof protection of the tunnel 1; when each arc lining 2 is pressed and positioned, radial expansion and contraction support can be performed according to the inner diameter size of the current tunnel 1, and circumferential rotation and pressing can be performed as needed during support, ensuring stable pressing of the arc lining 2 during grouting operation, reducing the occurrence of the arc lining 2 falling off due to excessive slurry pressure, and improving the safety during construction; when grouting reinforcement is performed, the top construction method of the two ends of the arc lining 2 is adopted, so that grouting can be performed from the grouting holes 5 at both ends at the same time, and the waterproof slurry can be injected from the top of the slurry filling cavity 4 and quickly flow and fill the entire slurry filling cavity 4, thereby forming a reinforcement layer connecting the inner wall of the tunnel 1 and the arc lining 2.

[0072] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. For those skilled in the art, any replacement improvements or changes made to the implementation methods of the present invention fall within the protection scope of the present invention.

[0073] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A small-section tunnel lining safety protection construction structure, characterized in that: It includes a central total drive unit, a central walking mechanism is installed at the bottom of the central total drive unit, and multi-point support mechanisms are respectively arranged on the front and rear sides of the central total drive unit, and each of the multi-point support mechanisms is driven by the central total drive unit. Each supporting end of each multi-point support mechanism is respectively abutted against the inner wall of the arc lining in the tunnel, and each of the arc linings is fixed to the inner wall of the tunnel by expansion bolts and an annular slurry filling cavity is reserved between the inner wall of the tunnel, and grouting holes for slurry injection are respectively arranged on the front and rear sides of each arc lining at the top, and a slurry processing unit is respectively arranged on one side of each multi-point support mechanism, and the slurry processing unit is used for grouting into the corresponding grouting hole above it, and an end walking mechanism is arranged at the bottom of each slurry processing unit, and each end walking mechanism is in a synchronous motion state with the central walking mechanism.

2. A small-section tunnel lining safety protection construction structure according to claim 1, characterized in that: The central total drive unit includes a fixed central gear box, in which a driving gear and a driven gear are arranged at intervals in a gear cavity of the central gear box, a rotating gear is meshed above the middle of the driving gear and the driven gear, and the rotating gear is meshed with the driving gear and the driven gear at the same time, a rigid center tube is fixedly inserted in the central cavity of the rotating gear, front and rear ends of the rigid center tube are both movable to the outside of the gear cavity and are respectively connected and cooperated with the multi-point support mechanism, a position control motor is fixedly installed at the end of the gear shaft of the driving gear, and the position control motor is fixed inside the gear cavity.

3. A small-section tunnel lining safety protection construction structure according to claim 2, characterized in that: The central walking mechanism includes two central wheel frames fixedly installed at an interval at the bottom of the central gear box, a central dual-axis motor is fixedly arranged between the two central wheel frames, the ends of the two output shafts of the central dual-axis motor are respectively connected to the central wheel axles, the ends of the central wheel axles are movably passed through the mounting holes on the central wheel frames and are respectively connected to the central wheels, and the central dual-axis motor is fixedly connected to the central gear box at the bottom of the central total drive unit through the central motor frame.

4. A small-section tunnel lining safety protection construction structure according to claim 3, characterized in that: The multi-support support mechanism includes the horizontally arranged rigid central tube, the center of which is provided with a central slurry delivery pipe cavity for slurry to pass through, the two ends of the central slurry delivery pipe cavity are respectively connected with the interior of the slurry processing unit at its corresponding position, circumferential positioning components are respectively installed on the outer sides of the front and rear ends of the rigid central tube, a plurality of radial support members are fixedly installed on the outer side wall of the circumferential positioning component at uniform intervals along its circumference, the outer end of each radial support member is used to abut the arc lining at its current position, and an end slurry delivery pipe cavity connected with the central slurry delivery pipe cavity is arranged at the center of the circumferential positioning component, the end of the end slurry delivery pipe cavity extends to the interior of the slurry processing unit at its corresponding position.

5. A small-section tunnel lining safety protection construction structure according to claim 4, characterized in that: The radial support member includes a radial telescopic cylinder fixedly mounted on the outer wall of the protective bin of the circumferential positioning assembly, the end of the piston rod of each radial telescopic cylinder is fixedly mounted with a support frame, a rigid support sphere is arranged in the mounting cavity of the support frame, the two ends of the rigid support sphere are respectively movably inserted into the corresponding axial holes of the support frame through their center axes, and each of the rigid support spheres is used to press against the inner wall of the arc lining at its corresponding position in the working state.

6. A small-section tunnel lining safety protection construction structure according to claim 5, characterized in that: The slurry processing unit includes a slurry storage box horizontally arranged on one side of the circumferential positioning assembly, the end walking mechanism is installed at the bottom of the slurry storage box, a slurry storage cavity is arranged inside the slurry storage box, the end of the end slurry delivery pipe cavity is communicated with the interior of the slurry storage cavity, a slurry mixer is installed inside the slurry storage cavity, the slurry mixer is driven by a mixing motor fixedly installed on the outer wall of the slurry storage box, a slurry discharge pipe with a grouting pump is installed on the outer wall at the slurry discharge hole on the other side of the slurry storage cavity, a retractable corrugated pipe section is arranged on the top of the slurry discharge pipe, a grouting rigid pipe is connected to the top of the corrugated pipe section, an adjustment platform is fixedly installed on the outer wall of the grouting rigid pipe, and grouting control electric cylinders are fixed at intervals on the top of the slurry storage box, the top of the piston rod of each of the grouting control electric cylinders is fixed on the adjustment platform and is used to drive the adjustment platform and the grouting rigid pipe thereon to rise and fall, and the grouting rigid pipe is cooperatively inserted into the grouting hole at the corresponding position during operation.

7. A small-section tunnel lining safety protection construction structure according to claim 6, characterized in that: A slurry guide pipe is installed on the end face side wall of the slurry storage box at the rear end, the interior of the slurry guide pipe is connected to the interior of the slurry storage cavity, and the feed end of the slurry guide pipe is connected to the downstream grouting equipment through a connecting flange.

8. A small-section tunnel lining safety protection construction structure according to claim 7, characterized in that: The end walking mechanism includes two end wheel frames fixedly installed at an interval at the bottom of the slurry storage box, an end dual-axis motor is fixedly arranged between the two end wheel frames, the ends of the two output shafts of the end dual-axis motor are respectively connected to the end wheel axles, the ends of the end wheel axles are movably passed through the mounting holes on the end wheel frames and are respectively connected to the end wheels, and the end dual-axis motor is fixedly connected to the bottom of the slurry storage box through the end motor frame.

9. A small-section tunnel lining safety protection construction structure according to claim 8, characterized in that: Blocking sleeves are sleeved and fitted on the outer walls of the expansion bolts between the inner wall of the tunnel and each of the arc-shaped linings. The blocking sleeves are located in the slurry filling cavity. When slurry is injected into the slurry filling cavity, the slurry solidifies and the arc-shaped lining and the inner wall of the tunnel are bonded and fixed.

10. A small-section tunnel lining safety protection construction structure according to claim 9, characterized in that: The slurry injected into the slurry filling cavity is filled in the slurry filling cavity in a continuously flowing state to form a grouting bonding layer structure.

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