Tunnel door closing type collapse bottom bypassing curve rescue method

Abstract

The invention relates to the technical field of tunnel engineering, in particular to a tunnel door closing type collapse bottom bypassing curve rescue method. According to the tunnel door closing type collapse bottom bypassing curve rescue method, the rescue channel is formed in the stratum below the tunnel, the tunnel collapse body is avoided, safety construction of the rescue channel is rapidly conducted, and therefore the situation that the collapse body is directly tunneled through a mechanical device, consequently, the collapse body is disturbed, and the secondary collapse risk is increased is effectively avoided; and the hindrance of a steel frame and an anchor rod possibly existing in the collapse body to tunneling is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel engineering, and more particularly to a tunnel door-closing type landslide bottom bypass curve rescue method. Background Art

[0002] The scale of tunnel construction in my country is huge, and tunnel collapse occurs from time to time. The so-called tunnel collapse refers to the situation where the construction workers are working on the tunnel face and the partially constructed tunnel behind them collapses, trapping the construction workers in front of them and making them unable to leave the dangerous area. This situation usually occurs when the secondary lining is not built in time and the primary lining in the collapsed area does not have enough support. When a tunnel collapse occurs, the construction workers are trapped in a small dangerous area, and the rapid rescue of the trapped people becomes a top priority.

[0003] At present, there are some rapid rescue methods for tunnel door collapse. For example, the Chinese invention patent with patent publication number CN104481582A discloses a rapid rescue method for tunnel door collapse. The method uses a spiral excavation pipe jacking pipe curtain equipment to set a steel pipe that can accommodate at least one person at the bottom of the tunnel door collapse area. The steel pipe passes through the bottom of the door collapse area to reach the construction area in the cave, forming an escape passage for trapped people. The Chinese invention patent with patent publication number CN109488366A discloses a rapid rescue device, which forms a safe and reliable rescue passage by jacking steel jacking pipes into the collapse body section by section until the steel jacking pipes pass through the collapse body, so as to achieve rapid and safe rescue of trapped people.

[0004] The above-mentioned closed-door tunnel collapse rescue methods mostly use mechanical devices to directly excavate the collapsed body. Since the tunnel collapsed body is an accumulation body, its structure is extremely unstable. The mechanical device is easy to disturb it during the excavation process, which may cause secondary collapse, endangering the safety of trapped and rescue personnel. In addition, tunnel collapses often occur in areas with weak and broken surrounding rocks. In such areas, the tunnel arch and side walls are often supported by steel frames and anchor rods. After the collapse occurs, the arch frames and anchor rods are buried inside the collapsed body, which greatly hinders the normal excavation of the rescue equipment and delays the rescue time. Forced excavation will cause greater disturbance to the collapsed body and may cause secondary collapse of the tunnel. Summary of the invention

[0005] The purpose of the present invention is to provide a method for detouring curve rescue at the bottom of a tunnel with closed doors, to build a rescue channel in the stratum below the tunnel, to avoid the tunnel collapse body and to quickly and safely construct the rescue channel, thereby effectively avoiding direct excavation of the collapse body by mechanical devices, causing disturbance of the collapse body and increasing the risk of secondary collapse, as well as obstruction to excavation caused by steel frames and anchor rods that may exist inside the collapse body.

[0006] In order to achieve these purposes and other advantages according to the present invention, a tunnel door-closed type landslide bottom bypass curve rescue method is provided, comprising the following steps:

[0007] S1. Set up a workstation in a safe area near the collapsed body in the tunnel, and dig a starting tunnel at the bottom of the tunnel between the workstation and the collapsed body;

[0008] S2. Install a reaction frame at the work station;

[0009] S3, the curved rescue equipment is tiltedly arranged on the reaction frame, the propulsion system thereof is fixedly connected to the reaction frame, and the excavation end of the curved rescue equipment faces the starting tunnel entrance;

[0010] S4, the curved rescue equipment starts to open the rescue channel, enters the stratum below the tunnel from the starting hole and then digs along the arc. The curved rescue equipment bypasses the collapsed body and enters the area where people are trapped in the tunnel, so that the rescue channel is connected with the area where people are trapped in the tunnel;

[0011] S5. The curved rescue equipment continues to dig to the entrance of the personnel passage above it and enters the tunnel. The trapped persons enter the personnel passage, pass through the personnel passage and reach the safe area in the tunnel, thus completing the rapid rescue of the trapped persons.

[0012] The beneficial effects of the present invention are:

[0013] In the closed-door tunnel landslide curve rescue method of the present invention, a curve rescue device with a small radius curve excavation function is used to excavate in the stratum below the tunnel to bypass the landslide body in the tunnel to form a rescue channel, and the trapped personnel leave the trapped area through the personnel channel on the curve rescue device. Compared with the commonly used method of excavating in the landslide body, the closed-door tunnel landslide curve rescue method of the present invention can effectively avoid the mechanical device directly excavating the landslide body to cause disturbance of the landslide body and increase the risk of secondary collapse, as well as the obstruction of excavation by steel frames and anchor rods that may exist inside the landslide body, and can quickly complete the excavation of the rescue channel.

[0014] On the basis of the above technical solution, the present invention can also be improved as follows:

[0015] Furthermore, in the described method of detour curve rescue at the bottom of a tunnel with closed doors, after the work station is selected in S1, the site is leveled and the foundation is reinforced and ground anchors are pre-buried at the work station, and when the reaction frame is installed at the work station in S2, the reaction frame is connected to the ground anchor to fix it at the work station.

[0016] The beneficial effect of adopting the above further scheme is: in this further scheme, by pre-burying ground anchors at the workstation, the reaction frame is fixed to the workstation through the ground anchors. Furthermore, in the above-mentioned method for detouring the curve rescue at the bottom of a tunnel with closed doors, before the curve rescue equipment in S4 starts to open the rescue channel, a pulling force away from the starting hole is applied to the curve rescue equipment by a crane arranged in the tunnel, so that the curve rescue equipment slides stably on the reaction frame toward the starting hole.

[0017] The beneficial effect of adopting the above further scheme is: in this further scheme, a pulling force away from the starting hole is applied to the curve rescue equipment through a crane, so that the main body of the curve rescue equipment will neither be lifted nor allowed to slide down, so that the curve rescue equipment can slide stably on the reaction frame toward the starting hole.

[0018] Furthermore, in the above-mentioned tunnel closed-door collapse bottom bypass curve rescue method,

[0019] The curve rescue equipment comprises:

[0020] The shield body comprises a front shield and a rear shield, wherein the front shield and the rear shield are hinged, and a direction adjustment mechanism for adjusting the connection angle is provided between the two;

[0021] A knife disc, which is arranged at the front end of the front shield;

[0022] A pipe segment component, comprising a first pipe segment and a plurality of second pipe segments, wherein the front end of the first pipe segment is hinged to the tail shield, and the plurality of second pipe segments are hingedly connected end to end, and the front end of the second pipe segment located at the front end is hinged to the rear end of the first pipe segment;

[0023] A propulsion system connected to the rear end of the second pipe section at the rear end;

[0024] A slag discharge system, comprising a slag conveying device disposed in the front shield, wherein a feed end of the slag conveying device is connected to a discharge end of the cutter disc;

[0025] A personnel passage is formed between the shield body and the pipe segment component, and a hatch is provided on the tail shield or the pipe segment component.

[0026] The beneficial effect of adopting the above further scheme is: in this further scheme, before the curve rescue equipment works, the trajectory of its excavation in the stratum below the tunnel, that is, the position of the rescue channel, is pre-set, and the curve rescue equipment excavates according to the pre-set trajectory. During the excavation process, the curve rescue equipment uses the propulsion system as a power source to push the first pipe section and the shield body forward, and the cutterhead at the front end of the shield body realizes rapid excavation under variable stratum conditions. The shield body can play a temporary support for the rescue channel and withstand the cutterhead rock-breaking reaction force and cutterhead anti-torque generated by the excavation of the cutterhead. At the same time, the shield body adopts a hinged mode of the front shield and the rear shield. The connection between the front shield and the rear shield is hinged and sealed to ensure that the slag and the like in the rock formation do not enter the curve rescue equipment, and can withstand a certain water pressure. The connection angle between the front shield and the rear shield is adjusted by the direction adjustment mechanism to adjust the direction of the cutterhead at the front end of the front shield and change the excavation direction of the cutterhead. When the curved rescue equipment is excavating in a curve along the length direction of the tunnel in the stratum below the tunnel, the moving trajectory of the curved rescue equipment is a curve, and the rescue channel dug by the curved rescue equipment is also curved. The connection angle between the front shield and the rear shield changes with the actual situation of the rescue tunnel. After each advancement of the propulsion system, the steering mechanism adjusts the connection angle of the front shield and the rear shield according to the pre-set rescue channel path, so that the front shield can be excavated according to the predetermined trajectory. The length of a single first pipe section can only meet the excavation of a shorter rescue channel. In order to meet the excavation of a longer rescue channel, multiple second pipe sections are set at the rear end of the first pipe section according to actual needs, and the length of the pipe section component is further extended. Multiple second pipe sections are arranged in sequence along the length direction of the curve rescue equipment and are hinged head to tail. The front end of the second pipe section at the front end is hinged to the rear end of the first pipe section, and the rear end of the second pipe section at the rear end is connected to the propulsion system. In this way, the second pipe section at the rear end can be pushed by the propulsion system to push the shield and the pipe section component forward. At this time, the connection angle between the second pipe section and the adjacent first pipe section or second pipe section changes with the actual situation of the rescue tunnel, ensuring that the curve rescue equipment moves smoothly in the rescue channel. Similarly, the connection between the second pipe section and the adjacent first pipe section or second pipe section is hinged and sealed to ensure that the slag and stones in the rock formation do not enter the curve rescue equipment and can withstand a certain water pressure. The second pipe section is connected to the adjacent first pipe section or second pipe section through a spherical ring steering structure. The spherical ring steering structure is a commonly used pipeline connection structure in the shield machine field. It ensures the articulation between the pipe segments and the sealing between the two. The pipeline connection structure specifically includes a rotating outer spherical connection ring and an inner spherical connection ring. The outer spherical connection ring is set at the rear end of the front pipe segment, and the inner spherical connection ring is set at the front end of the rear pipe segment.A personnel passage is formed between the shield body and the pipe section component, and a hatch is provided on the tail shield or the pipe section component. When the curve rescue equipment is excavating, the personnel passage is closed by the hatch; after the curve rescue equipment reaches the area where the personnel are trapped and the rescue passage is exposed to the surface, the rescue hatch is opened to realize the connection between the personnel passage and the rescue passage, and the trapped construction personnel can enter the personnel passage, leave the area where the personnel are trapped in the tunnel through the personnel passage, and enter the safe area in the tunnel. At the same time, the present invention sets a slag conveying device in the front shield, connects the feeding end of the slag conveying device with the discharging end of the cutter disc, and timely transports the rock and soil broken during the excavation of the cutter disc to the rear end through the slag conveying device to ensure the normal operation of the cutter disc. In order to facilitate the movement of the second pipe section to between the top ring and the last pipe section, a swing arm crane is provided, and the swing arm crane is installed between the top ring and the support frame, and the second pipe section is hoisted to between the top ring and the last pipe section by the swing arm crane.

[0027] Furthermore, in the method for detouring around the curve to rescue the bottom of a tunnel with closed doors, after each advancement of the propulsion system, the first pipe segment is hinged at the rear end of the tail shield or the second pipe segment is hinged at the rear end of the rearmost pipe segment.

[0028] The beneficial effect of adopting the above further scheme is that in this further scheme, the lengths of the first pipe section and the second pipe section are the same and equal to the propulsion stroke of the propulsion system. After the propulsion system propels the shield forward for the first time, it returns to its original state and installs the first pipe section at the rear end of the tail shield. At this time, the propulsion system conflicts with the first pipe section, and the propulsion system can propel the first pipe section forward by one thread. After returning to its original state again, the second pipe section can be installed behind the first pipe section, and so on. After each propulsion stroke of the propulsion system, a new pipe section is installed.

[0029] Furthermore, in the method for detouring curved rescue at the bottom of a tunnel with closed doors, when the curved rescue equipment is excavating a straight section of the rescue channel, the steering mechanism is locked; when the curved rescue equipment is excavating a curved section of the rescue channel, the steering mechanism adjusts the connection angle of the front shield and the rear shield once after each propulsion stroke of the propulsion system.

[0030] The beneficial effect of adopting the above further solution is that in this further solution, when the curved rescue equipment excavates the straight section of the rescue channel, the steering mechanism is locked to prevent the front shield and the rear shield from rotating, causing the front shield to deflect. When the curved rescue equipment excavates the curved section of the rescue channel, after each stroke of the propulsion system, the steering mechanism adjusts the connection angle of the front shield and the rear shield according to the preset rescue channel path, so that the front shield excavates according to the predetermined trajectory.

[0031] Furthermore, in the described method for detour curve rescue at the bottom of a tunnel with closed doors, the cutterhead is provided with a roller and a scraper.

[0032] The beneficial effect of adopting the above further scheme is: in this further scheme, the cutter disc is provided with a roller cutter and a scraper, and the efficient cutting ability and wear resistance of the roller cutter are utilized for excavation, and the scraper is used to clean the excavated soil on the periphery, thereby preventing direct wear of the outer edge of the cutter disc and ensuring the accuracy of the excavation diameter.

[0033] Furthermore, in the said method for detouring curve rescue at the bottom of a tunnel with closed doors, the said steering mechanism comprises a plurality of steering cylinders, and both ends of the said steering cylinders are respectively hinged to the said front shield and the said rear shield.

[0034] The beneficial effect of adopting the above further scheme is: in this further scheme, multiple groups of directional adjustment cylinders are evenly distributed along the circumferential direction of the front shield or the tail shield. By adjusting the stroke and pressure of each directional adjustment cylinder, the multiple groups of directional adjustment cylinders cooperate with each other to adjust the connection angle between the front shield and the tail shield, thereby achieving the purpose of adjusting the equipment posture and controlling the excavation direction.

[0035] Furthermore, in the above-mentioned method for rescuing a tunnel-door-closed collapse bottom detour curve, the slag discharge system further includes a slag conveying device, and the slag conveying device includes:

[0036] A chain track, the front end of which extends to the discharging end of the slag conveying device, and the rear end of which extends into the pipe segment component and is flexibly connected to the tail shield and the top wall of the pipe segment component respectively;

[0037] A track crane slidably disposed on the chain track;

[0038] The slag bag is detachably connected to the track crane, and the track crane can drive the slag bag to move to the discharge end of the slag conveying device.

[0039] The beneficial effect of adopting the above further scheme is: in this further scheme, if the rock and soil output by the slag conveying device are all placed in the tail shield, a large amount of rock and soil will accumulate in the tail shield, affecting the normal operation of the curve rescue equipment. The curve rescue equipment needs to stop to clear the slag before excavating, so a slag conveying device is set up. When the curve rescue equipment excavates forward, the slag is transported by the slag conveying device, and the rock and soil output by the slag conveying device in the tail shield is transported backward, thereby avoiding the accumulation of rock and soil in the tail shield, and the curve rescue equipment does not need to stop to clear the slag. Since the tail shield and the pipe segment component are hinged, they are not suitable for rigid tracks, so the chain track is flexibly connected on the top wall of the tail shield and the pipe segment component. The chain track is flexible and can adapt to the rotation between the tail shield and the pipe segment component. The rail crane moves back and forth on the chain track, and a hook is arranged at its lower end. The slag bag filled with slag at the discharge end of the slag conveying device is hung on the hook. The rail crane drives the slag bag below it to move backward to the pipe section component, and replaces it with an empty slag bag at the discharge end of the slag conveying device, thereby ensuring that the slag is always collected by the slag bag at the discharge end of the slag conveying device, so that the curve rescue equipment does not need to stop for slag cleaning.

[0040] Furthermore, in the described method of detour curve rescue at the bottom of a tunnel with closed doors, the chain track is composed of multiple sub-tracks, the sub-tracks are provided in the tail shield, the first pipe section and the second pipe section, and the sub-tracks are connected to the tail shield and the top wall of the pipe section component through multiple flexible chain hangers.

[0041] The beneficial effect of adopting the above further scheme is: in this further scheme, the adjacent sub-tracks are connected by track transition blocks, so that multiple sub-tracks are spliced ​​into a long chain track, so that after adding a new second pipe segment, the sub-track in the new second pipe segment is connected to the chain track in the front pipe segment, so that the track crane can move to the second pipe segment at the rear. The sub-track is flexibly connected to the top wall of the tail shield and the pipe segment component through multiple flexible chain hangers. When the chain track is deformed, the stability of the chain track is ensured by the buffering of the flexible chain hangers.

[0042] Furthermore, in the tunnel door closing type landslide bottom bypass curve rescue method, the propulsion system includes:

[0043] Support frame;

[0044] A propulsion cylinder, which is arranged on the support frame;

[0045] A top ring is connected to the telescopic rod of the propulsion cylinder.

[0046] The beneficial effect of adopting the above further scheme is: in this further scheme, the propulsion system adopts a structure similar to that of the pipe jacking machine, the front end of the top ring is connected to the last pipe segment, and the shield body and the pipe segment components are moved forward by the propulsion cylinder. Then the propulsion cylinder drives the top ring to reset, and the second pipe segment is added between the top ring and the last pipe segment. After the connection of the second pipe segment is completed, the shield body and the pipe segment components are pushed forward again by the propulsion cylinder.

[0047] Furthermore, the method for detour curve rescue at the bottom of a tunnel with closed doors also includes a swing arm crane, which is arranged on the propulsion system.

[0048] The beneficial effect of adopting the above further scheme is: in this further scheme, in order to facilitate moving the second pipe section between the top ring and the last pipe section, a swing arm crane is set up, and the swing arm crane is installed between the top ring and the support frame. The second pipe section is lifted and installed between the top ring and the last pipe section by the swing arm crane.

[0049] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a schematic diagram of site preparation in the bottom detour curve rescue method described in one embodiment of the present invention;

[0051] Figure 2 It is a schematic diagram of the curve rescue device moving to the working position in the bottom detour curve rescue method described in one embodiment of the present invention;

[0052] Figure 3 It is a schematic diagram of the installation of the curve rescue equipment on the reaction frame in the bottom detour curve rescue method described in one embodiment of the present invention;

[0053] Figure 4 It is a schematic diagram of the bottom bypass curve rescue method described in one embodiment of the present invention when the curve rescue equipment starts to dig;

[0054] Figure 5 It is a schematic diagram of the curve rescue equipment excavating in the bottom bypass curve rescue method described in one embodiment of the present invention;

[0055] Figure 6 It is a structural schematic diagram of a curve rescue device described in another embodiment of the present invention;

[0056] Figure 7 It is a structural schematic diagram of a cutter disc described in another embodiment of the present invention;

[0057] Figure 8It is a structural schematic diagram of the direction adjustment mechanism described in another embodiment of the present invention;

[0058] Fig. 9 It is a structural schematic diagram of a slag discharge system according to another embodiment of the present invention;

[0059] Fig.10 It is a structural schematic diagram of a spherical ring steering structure described in another embodiment of the present invention;

[0060] Fig.11 It is a structural schematic diagram of a personnel passage described in another embodiment of the present invention.

[0061] Wherein, the reference numerals represent:

[0062] Cutter disc 1; shield body 2; front shield 2-1; tail shield 2-2; steering cylinder 3; slag conveying device 4-1; slag bag 4-2; track crane 4-3; chain track 4-4; flexible chain 4-5; pipe segment component 5; first pipe segment 5-1; second pipe segment 5-2; top ring 6-1; propulsion cylinder 6-2; support frame 6-3; swing arm crane 7; hatch 8; starting hole 9; reaction frame 10. DETAILED DESCRIPTION

[0063] The present invention is further described in detail below in conjunction with embodiments so that those skilled in the art can implement the invention with reference to the description.

[0064] It should be noted that, in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0065] like Figure 1-Figure 5 As shown, an embodiment of the present invention provides a tunnel door-closed collapse bottom detour curve rescue method, comprising the following steps:

[0066] S1. Site preparation: Figure 1 As shown, after the tunnel gate collapse occurs, a rescue starting site is set up as a work station in a safe area near the gate collapse body, and the site leveling, foundation reinforcement, anchor pre-embedding and other preparatory work are carried out at the work station according to the predetermined equipment starting rock entry angle, and the starting hole 9 is excavated at the bottom of the tunnel;

[0067] S2. Installation of reaction frame 10: Figure 2 As shown, the reaction frame 10 is moved to the working position and anchored;

[0068] S3, equipment into the workstation: Figure 3 As shown, the curve rescue equipment is transported to the work station, hoisted and placed on the reaction frame 10, the support frame of the curve rescue equipment is close to the reaction frame 10 back plate, and a limit tool is set on the reaction frame 10 to fix the curve rescue equipment, and the control system, hydraulic system and other components of the curve rescue equipment are hoisted into the work station;

[0069] S4, equipment connection, main engine lowering: connect the curve rescue equipment with the electric control system and hydraulic system pipelines, hang the assembly crane hook on the shield body and apply a certain tension force (neither lift the shield body nor let the shield body slide down), remove the limit tooling between the shield body and the support frame; push the equipment to the face: power on the equipment, the propulsion system applies a small propulsion force, and the assembly crane cooperates with the lowering hook to make the main engine move downward along the support frame track. When the propulsion cylinder completes a stroke, use the equipment crane to install the pipe segment, and then continue to push until the cutter head reaches the face;

[0070] S5. Equipment excavation: Figure 4 As shown in the figure, remove the hook, start the cutterhead, gradually increase the thrust of the propulsion system, adjust the cutterhead speed to the appropriate parameter, control the stroke of each steering cylinder of the steering mechanism, and make the shield body carry out rock breaking excavation, pipe segment and pipeline extension, slag removal and other construction along the predetermined route to open up the rescue channel;

[0071] S6. Personnel rescue: Figure 5 As shown in the figure, after each advancement of the propulsion system, the steering mechanism adjusts the connection angle of the front shield and the rear shield, so that the curved rescue equipment can be excavated according to the predetermined route and the rescue channel can be opened. The propulsion system continues to advance until the hatch is in a suitable position for personnel to enter and exit, locks the propulsion system and the steering mechanism, opens the hatch of the personnel channel, and implements personnel rescue and transfer.

[0072] Preferably, as another embodiment of the present invention, Figure 6-11 As shown, the curve rescue equipment includes:

[0073] The shield body 2 includes a front shield 2-1 and a rear shield 2-2, wherein the front shield 2-1 and the rear shield 2-2 are hinged, and a direction adjustment mechanism for adjusting the connection angle is provided between the two; a plurality of direction adjustment cylinders 3, wherein the two ends of the direction adjustment cylinders 3 are respectively hinged to the front shield 2-1 and the rear shield 2-2;

[0074] The cutterhead 1 is arranged at the front end of the front shield 2-1; the cutterhead 1 adopts a composite cutterhead 1 design, including a roller cutter and a scraper, which can achieve rapid excavation under variable formation conditions of 0-50MPa. The excavation diameter is 1.2m, which can meet the size requirements of personnel passage, slag discharge, maintenance, etc. and reduce the disturbance of the collapse, so as to achieve rapid excavation of the rescue channel;

[0075] The pipe segment component 5 is installed between the tail of the shield and the propulsion system. It is the force transmission structure of the propulsion system and provides support for the rescue channel. The pipe segment is a cylindrical structure to meet the construction requirements of rescue channels with different turning radii. The pipe segment component 5 includes a first pipe segment 5-1 and at least one second pipe segment 5-2. The front end of the first pipe segment 5-1 is hinged to the tail shield 2-2; at least one second pipe segment 5-2. When the second pipe segment 5-2 is provided in multiple pieces, the multiple second pipe segments 5-2 are in a state of being hingedly connected end to end, and the front end of the second pipe segment 5-2 located at the front end is hinged to the rear end of the first pipe segment 5-1, and the rear end of the second pipe segment 5-2 located at the rear end is connected to the propulsion system;

[0076] The propulsion system is connected to the rear end of the first pipe segment 5-1. The propulsion system is located at the rear end of the curve rescue machine and includes a top ring 6-1, a cylinder and a support frame 6-3. The top ring 6-1 and the cylinder are installed on the support frame 6-3. The front end of the top ring 6-1 is the pipe segment component 5. The thrust generated by the excavation cylinder acts on the pipe segment component 5 through the top ring 6-1, and is transmitted to the cutter head 1 through the pipe segment component 5 and the shield body 2, pushing the cutter head 1 to excavate forward.

[0077] A slag discharge system, comprising a slag conveying device 4-1 disposed in the front shield 2-1, wherein a feed end of the slag conveying device 4-1 is connected to a discharge end of the cutter head 1;

[0078] A personnel passage is formed between the shield body 2 and the pipe joint component 5, and a hatch 8 is provided on the tail shield 2-2 or the pipe joint component 5;

[0079] The steering mechanism comprises a plurality of steering cylinders 3, and two ends of the steering cylinders 3 are respectively hinged to the front shield 2-1 and the rear shield 2-2.

[0080] In this embodiment, when the curve rescue equipment is working, the rear end of the tail shield 2-2 is not connected to the first pipe section 5-1 in the initial state, and the connection angle between the front shield 2-1 and the tail shield 2-2 is adjusted by multiple sets of directional cylinders 3 to adjust the direction of the cutter head 1 at the front end of the front shield 2-1, thereby changing the excavation direction of the cutter head 1. Then the shield body 2 is pushed forward by the propulsion system, and the rescue channel is excavated in full section by the cutter head 1 at the front end of the shield body 2 during the movement. The propulsion system is reset after a single push, and the first pipe section 5-1 is placed behind the tail shield 2-2 and connected to it. The propulsion system then pushes the first pipe section 5-1 forward, and so on, and the installation of the second pipe section 5-2 is completed one by one. During the pushing process, the cutter head 1 at the front end of the shield body 2 excavates the rescue channel. When the curved rescue equipment is excavating, the personnel passage is closed by the hatch 8; after the curved rescue equipment reaches the trapped area and the rescue passage is exposed to the surface, the rescue hatch 8 is opened to connect the personnel passage and the rescue passage. At this time, the trapped construction workers can enter the personnel passage, leave the trapped area in the tunnel through the personnel passage, and reach the safe area in the tunnel.

[0081] Preferably, as another embodiment of the present invention, the second pipe segment 5-2 is connected to the adjacent first pipe segment 5-1 or the second pipe segment 5-2 via a spherical ring steering structure.

[0082] In this embodiment, the spherical ring steering structure is a commonly used pipeline connection structure in the shield machine field, which ensures the hinge between the pipe segments and the seal between the two. The pipeline connection structure specifically includes a rotatably connected outer spherical connection ring and an inner spherical connection ring, the outer spherical connection ring is arranged at the rear end of the front pipe segment, and the inner spherical connection ring is arranged at the front end of the rear pipe segment.

[0083] Preferably, as another embodiment of the present invention, the slag discharge system further includes a slag conveying device, and the slag conveying device includes:

[0084] A chain track 4-4, the front end of which extends to the discharge end of the slag conveying device 4-1, and the rear end of which extends into the pipe segment component 5, and is flexibly connected to the tail shield 2-2 and the top wall of the pipe segment component 5 respectively; the chain track 4-4 is spliced ​​by a plurality of sub-tracks, and the tail shield 2-2, the first pipe segment 5-1 and the second pipe segment 5-2 are all provided with the sub-tracks; the chain track 4-4 is connected to the tail shield 2-2 and the top wall of the pipe segment component 5 through a plurality of flexible chains 4-5;

[0085] A track crane 4-3, which is slidably arranged on the chain track 4-4;

[0086] The slag bag 4-2 is detachably connected to the track crane 4-3, and the track crane 4-3 can drive the slag bag 4-2 to move to the discharge end of the slag conveying device 4-1.

[0087] In this embodiment, the slag conveying device 4-1 adopts an axial screw conveyor, which is installed in the central area of ​​the front shield 2-1 and supported by a bracket to transport the rock and soil crushed by the cutter head 1 during excavation to the rear end to the slag bag 4-2. The slag bag 4-2 is set at the rear end of the axial screw conveyor and is suspended on the chain track 4-4 by a track crane 4-3 to transport the slag. The chain track 4-4 is suspended on the top of the rear shield and the pipe section through a flexible chain 4-5, and the chain track 4-4 between adjacent pipe sections is connected by a track transition block. The above-mentioned chain track 4-4 design enables the slag bag 4-2 to achieve rapid slag discharge on the track crane 4-3 when the slope is large and the pipe section turns and twists.

[0088] Preferably, as another embodiment of the present invention, the propulsion system comprises:

[0089] Support frame 6-3;

[0090] A propulsion cylinder 6-2, which is arranged on the support frame 6-3;

[0091] The top ring 6-1 is connected to the telescopic rod of the propulsion cylinder 6-2.

[0092] In this embodiment,

[0093] The back plate of the support frame 6-3 is close to the foundation pit wall, and the foundation pit wall provides the propulsion reaction force; when there is no foundation pit to start, the support frame 6-3 needs to be anchored on the tunnel floor, and the floor needs to be reinforced.

[0094] Preferably, as another embodiment of the present invention, it further comprises a swing arm crane 7, and the swing arm crane 7 is arranged on the propulsion system.

[0095] In this embodiment, after the propulsion system pushes the curved rescue equipment into the previous ring pipe segment, the swing arm crane 7 is used to lift the next ring pipe segment to the front end of the top ring 6-1, which can effectively improve the rescue excavation efficiency.

[0096] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the embodiments shown and described herein.

Claims

1. A tunnel door-closed collapse bottom detour curve rescue method, characterized in that: The following steps are involved: S1. Set up a workstation in a safe area near the collapsed body in the tunnel, and dig a starting tunnel at the bottom of the tunnel between the workstation and the collapsed body; S2. Install a reaction frame at the work station; S3, the curved rescue equipment is tiltedly arranged on the reaction frame, the propulsion system thereof is fixedly connected to the reaction frame, and the excavation end of the curved rescue equipment faces the starting tunnel entrance; S4, the curved rescue equipment starts to open the rescue channel, enters the stratum below the tunnel from the starting hole and then digs along the arc. The curved rescue equipment bypasses the collapsed body and enters the area where people are trapped in the tunnel, so that the rescue channel is connected with the area where people are trapped in the tunnel; S5. The curved rescue equipment continues to dig to the entrance of the personnel passage above it and enters the tunnel. The trapped persons enter the personnel passage, pass through the personnel passage and reach the safe area in the tunnel, thus completing the rapid rescue of the trapped persons.

2. A tunnel door-closed collapse bottom detour curve rescue method as claimed in claim 1, characterized in that: After the workstation is selected in S1, the site is leveled and the foundation is reinforced and ground anchors are pre-buried at the workstation. When the reaction frame is installed at the workstation in S2, the reaction frame is connected to the ground anchor to fix it at the workstation.

3. A tunnel door-closed collapse bottom detour curve rescue method as claimed in claim 1, characterized in that: Before the curve rescue equipment in S4 starts to open the rescue channel, a pulling force away from the starting tunnel entrance is applied to the curve rescue equipment through a crane installed in the tunnel, so that the curve rescue equipment can slide stably toward the starting tunnel entrance on the reaction frame.

4. A tunnel door-closed collapse bottom detour curve rescue method as claimed in claim 1, characterized in that: The curve rescue equipment comprises: The shield body comprises a front shield and a rear shield, wherein the front shield and the rear shield are hinged, and a direction adjustment mechanism for adjusting the connection angle is provided between the two; A knife disc, which is arranged at the front end of the front shield; A pipe segment component, comprising a first pipe segment and a plurality of second pipe segments, wherein the front end of the first pipe segment is hinged to the tail shield, and the plurality of second pipe segments are hingedly connected end to end, and the front end of the second pipe segment located at the front end is hinged to the rear end of the first pipe segment; A propulsion system connected to the rear end of the second pipe section at the rear end; A slag discharge system, comprising a slag conveying device disposed in the front shield, wherein a feed end of the slag conveying device is connected to a discharge end of the cutter disc; A personnel passage is formed between the shield body and the pipe segment component, and a hatch is provided on the tail shield or the pipe segment component; A swing arm crane is arranged on the propulsion system.

5. A tunnel door-closed collapse bottom detour curve rescue method as claimed in claim 4, characterized in that: After each propulsion stroke of the propulsion system, the first pipe segment is hinged at the rear end of the tail shield or the second pipe segment is hinged at the rear end of the rearmost pipe segment.

6. A tunnel door-closed collapse bottom detour curve rescue method as claimed in claim 4, characterized in that: When the curved rescue equipment excavates the straight section of the rescue channel, the steering mechanism is locked; when the curved rescue equipment excavates the curved section of the rescue channel, the steering mechanism adjusts the connection angle of the front shield and the rear shield once after each propulsion stroke of the propulsion system.

7. A tunnel door-closed collapse bottom detour curve rescue method as claimed in claim 4, characterized in that: The direction adjustment mechanism comprises a plurality of direction adjustment oil cylinders, and two ends of the direction adjustment oil cylinders are respectively hinged to the front shield and the rear shield.

8. A tunnel door-closed collapse bottom detour curve rescue method as claimed in claim 4, characterized in that: The slag discharge system further comprises a slag conveying device, and the slag conveying device comprises: A chain track, the front end of which extends to the discharging end of the slag conveying device, and the rear end of which extends into the pipe segment component and is flexibly connected to the tail shield and the top wall of the pipe segment component respectively; A track crane slidably disposed on the chain track; The slag bag is detachably connected to the track crane, and the track crane can drive the slag bag to move to the discharge end of the slag conveying device.

9. A tunnel door-closed collapse bottom detour curve rescue method as claimed in claim 8, characterized in that: The chain track is formed by splicing a plurality of sub-tracks, and the tail shield, the first pipe section and the second pipe section are all provided with the sub-tracks, and the sub-tracks are connected to the tail shield and the top wall of the pipe section component through a plurality of flexible chain hangers.

10. A tunnel door-closed collapse bottom detour curve rescue method as claimed in claim 4, characterized in that: The propulsion system comprises: Support frame; A propulsion cylinder, which is arranged on the support frame; A top ring is connected to the telescopic rod of the propulsion cylinder.

Images