Shield split launching device for extreme space

Abstract

The present invention provides a shield split starting device for use in a limited space. The split starting device includes a shield main machine, a telescopic muck conveying belt, a telescopic bridge and a hoisting system. The muck conveying belt is installed at the position of the shield muck outlet at the tail of the shield main machine through the bridge, and the hoisting system is installed on the bridge. The bridge includes two groups of parallel frames connected by horizontal connecting rods. Each group of frames includes a telescopic cross beam, fixed columns located at both ends of the telescopic cross beam, and height-adjustable columns. A track installation groove and a belt installation frame are provided on one side of the telescopic cross beam adjacent to the height-adjustable column. The hoisting system includes two hoisting tracks and a segment crane slidably connected between the two hoisting tracks. Each hoisting track is hingedly connected to the tail end of the shield main machine through a hinge member. The present invention can adjust the lengths of the bridge and the belt after the shield has advanced a certain distance, increase the single muck discharge volume, and thus improve the construction efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of shield construction, and particularly relates to a shield split launching device for use in a limited space, mainly for shield split launching in a limited space. Background Art

[0002] At present, the urban space has become extremely tense. In order to better promote the level of urbanization and further plan the development towards the underground space, the shield is often used as the first choice because its construction technology is adapted to the characteristics of the city. At present, during the shield construction process, the muck excavated by the shield machine is mainly transported to the muck pit through the muck conveying belt.

[0003] During the shield construction process, due to the restrictions of the surrounding environment or different uses of the underground space, the length, width or height of the station is often insufficient, resulting in the inability to place the trailing jacks of the shield machine at the position of the tunnel design axis, thus causing the shield launching station or launching shaft not to meet the overall launching requirements of the shield machine; or because the station structure is not standard, there is no dedicated muck outlet or the position of the sluice outlet deviates from the design axis, and the overall launching requirements cannot be met. In view of the above situation, split launching is generally adopted. Split launching means placing the shield body in the launching shaft and the trailing jacks on the ground, and then setting up a bridge at the shield tail for installing the trailing jack connection pipelines, the muck conveying belt and the hoisting system.

[0004] The existing split launch has the following defects: First, due to the limited space behind the shield tail of the split launch, the length of the muck conveyor belt is similarly restricted. To ensure the inclination angle and extension length of the belt, generally only the inclined section is retained and the horizontal part is removed; the transportation of the segment for shield launch is transferred by machinery such as forklifts, and some shield machines are also designed with segment trolleys, increasing the transfer process. At the same time, the installation space of the segment trolley affects the extension space of the muck hopper under the belt conveyor, resulting in less storage space for the muck hopper. Since shield launch is one of the processes with extremely high risks, using a small-sized muck hopper device cannot meet the requirements of rapid construction. Second, most of the existing bridge structures for split launch have fixed vertical and horizontal dimensions and cannot be reused in a repeated cycle under different working conditions (projects); moreover, all components in the bridge structure design are connected in a fixed form, without movable space and are not convenient for adjustment. When the muck conveyor belt needs to be extended or the hoisting system needs to be lengthened, no installation space can be provided, thus affecting the normal shield launch; and the existing bridge structure design is a truss structure, with a relatively large weight, and the front section of the bridge is connected to the H-frame inside the shield body. Third, during the existing ordinary shield launch process, horizontal transportation generally uses a rail-mounted electric locomotive, and vertical transportation generally has a separate hoisting wellhead, and the hoisting machinery uses a truck crane and other structures, all of which occupy a relatively large space and are not suitable for split launch with limited space. Fourth, during the split launch process, media such as oil, water, and gas are generally transmitted through pipelines. It is sufficient to ensure the supply of water and gas, but oil poses a safety risk to the pressure maintenance of the hydraulic system, etc. Summary of the Invention

[0005] Aiming at the problems existing in the background technology, the present invention provides a shield split launch device for extremely limited space. This shield launch device has been improved for the conveyor belt, bridge, and segment transportation and hoisting mechanism, enabling the entire set of devices to be applicable to the shield split launch with limited space, solving the problem of slow muck discharge speed during shield launch caused by limited space, and ensuring the safe operation of shield split launch.

[0006] In order to achieve the above technical objectives, the present invention provides a shield split launching device for use in a limited space, characterized in that: the split launching device includes a shield main machine, a telescopic muck conveying belt, a telescopic bridge and a hoisting system. The muck conveying belt is installed at the position of the shield muck outlet at the tail of the shield main machine through the bridge. The bridge includes two sets of parallel frames, which are connected by horizontal connecting rods. Each set of frames includes a telescopic cross beam, a fixed column and a height adjustable column. The fixed column and the height adjustable column are respectively arranged at both ends of the telescopic cross beam, and the fixed column is close to the shield main machine. On the side of the telescopic cross beam close to the height adjustable column, there are a track installation groove and a belt installation bracket; the hoisting system includes two hoisting tracks and a segment crane slidably connected between the two hoisting tracks. One end of each hoisting track is installed in the track installation groove through an adjusting mechanism, and the other end extends downward towards the fixed column, horizontally extends out of the bridge to the shield tail area, and is hingedly connected to the H-shaped steel at the tail end of the shield main machine through a hinge member. Each hoisting track is connected to the corresponding fixed column through an elastic support;

[0007] The muck conveying belt is located between the two sets of frames, one end is installed on the belt installation bracket, and the other end extends downward and obliquely to the position of the shield muck outlet of the shield main machine. The muck conveying belt includes a belt support, a conveying belt, a driving belt roller and a driven belt roller. The belt support is connected to the bridge through multiple connecting brackets; the conveying belt is a telescopic belt, including a fixed area above the belt support and a telescopic area below the belt support. The telescopic area includes two first adjusting belt rollers and a second adjusting belt roller with different heights. After the belt in the telescopic area sequentially winds around the two adjusting belt rollers, its two ends respectively wind around the driving belt roller and the driven belt roller and are connected to the belt in the fixed area as a whole; on both sides of the belt support, two sets of chutes are symmetrically arranged. Each set of chutes includes two parallel strip-shaped grooves. The two ends of the two adjusting belt rollers are respectively slidably connected to the corresponding strip-shaped grooves, and under the control of the telescopic mechanism, the two adjusting belt rollers move in opposite directions along the corresponding strip-shaped grooves. At both ends of the belt roller at the high end of the muck conveying belt far from the shield muck outlet, hydraulic cylinders are symmetrically arranged. The two hydraulic cylinders are fixed on the belt installation bracket of the bridge through an installation base. Under the action of the hydraulic cylinders and the telescopic mechanism, the movement of the two adjusting belt rollers drives the belt in the telescopic area to stretch and extend or overlap and shorten.

[0008] Further technical solution of the present invention: The split starting device further includes a horizontal transportation system; the horizontal transportation system consists of a winch, a transportation trolley, and a pulley traction mechanism. The winch is installed at the position of the hoisting shaft. The pulley traction mechanism includes a traction steel wire rope and a first traction pulley and a second traction pulley respectively arranged on the front and rear sides of the transportation trolley. The first traction pulley is installed near the winch, and the second traction pulley is installed near the shield main machine. One end of the traction steel wire rope is fixed on the side of the transportation trolley near the winch, and the other end bypasses the roller of the winch and then successively bypasses the first traction pulley and the second traction pulley and is fixedly connected to the side of the transportation trolley away from the winch.

[0009] Preferred technical solution of the present invention: When the belt in the telescopic area of the conveying belt is in a contracted state, the first adjusting belt roller in the upper strip groove is located at the lower end of the strip groove, and the second adjusting belt roller in the lower strip groove is located at the upper end of the strip groove; the high-end part of the belt in the telescopic area of the conveying belt is integrated with the fixed-area belt around the high-end belt roller of the muck conveying belt, and after winding around the first adjusting belt roller in the upper strip groove from the high end to the low end, it returns from the low end to the high end and winds around the second adjusting belt roller and then extends towards the low end, and is integrated with the fixed-area belt around the low-end belt roller of the muck conveying belt; under the traction of the hydraulic cylinder and the adjustment of the telescopic mechanism, the belt in the telescopic area extends to extend the belt length of the horizontal section of the muck conveying belt, or contracts to shorten the belt length of the horizontal section of the muck conveying belt.

[0010] Preferred technical solution of the present invention: The driving belt roller is located at the high end away from the shield slag outlet, and the hydraulic cylinders are symmetrically arranged at both ends of the driving belt roller; there are a plurality of mounting holes on the belt mounting frame, and the mounting holes are equidistantly distributed on the belt mounting frame. The mounting base of the hydraulic cylinder is fixed on the belt mounting frame by bolts, and the mounting position is movable.

[0011] Further technical solution of the present invention: The telescopic mechanism includes a first adjusting screw rod arranged on both sides of each adjusting belt roller and a first control motor arranged at the end of each first adjusting screw rod. The control motor is fixed on the belt bracket, and the other end of the first adjusting screw rod is fixed on the belt bracket through a rotating bracket. Both ends of each adjusting belt roller are threadedly sleeved on the corresponding first adjusting screw rod on the corresponding side. The first adjusting screw rods on both sides of each adjusting belt roller rotate simultaneously under the action of the control motor, so as to drive the adjusting belt roller to move along the adjusting screw rod through the screw sleeve; the control motors of the first adjusting belt roller and the second adjusting belt roller move synchronously and in opposite directions.

[0012] Preferred technical solution of the present invention: The main driving motor of the muck conveying belt adopts a built-in motor, and the motor is arranged inside the driving belt roller; the length of the belt bracket is the length of the inclined section of the muck conveying belt, and retaining plates are arranged on both sides of the belt in the inclined section of the muck conveying belt.

[0013] The preferred technical solution of the present invention: The telescopic cross beam includes a fixed beam, a telescopic beam and a lateral adjustment oil cylinder. The fixed column is arranged at the free end of the telescopic beam, and its top end is hinged to the telescopic beam. The height-adjustable column is arranged at the free end of the fixed beam, and its top end is hinged to the fixed beam. A track installation groove is provided on the fixed beam. The telescopic beam and the fixed beam are nested and connected, and a plurality of adjustment screw holes are correspondingly provided at the connection part. The cylinder body of the lateral adjustment oil cylinder is installed on the fixed beam, and the piston end is installed on the telescopic beam through a bracket. Under the action of the lateral adjustment oil cylinder, the telescopic beam moves along the telescopic sleeve at the end of the fixed beam, and after moving to the set position, it is fixed and locked by a plurality of first locking bolts. The height-adjustable column includes a telescopic column and a longitudinal adjustment oil cylinder that are nested with each other, and the height of the telescopic column is adjusted under the action of the longitudinal adjustment oil cylinder. After adjusting to the set position, it is fixed and locked by a plurality of second locking bolts.

[0014] The preferred technical solution of the present invention: The bottom parts of the fixed column and the height-adjustable column are respectively provided with traveling mechanisms. The adjustment mechanism includes a second adjustment screw rod horizontally arranged in the track installation groove and a threaded adjustment sleeve fixedly arranged at the end of the hoisting track. The threaded adjustment sleeve is threadedly connected to the second adjustment screw rod. The two ends of the second adjustment screw rod are respectively rotatably connected to the ends of the track installation groove through bearings, and one end thereof extends out of the track installation groove and is provided with a control motor. The adjustment mechanism and the lateral adjustment oil cylinder work synchronously.

[0015] The preferred technical solution of the present invention: The slide rails of the two hoisting tracks are arranged on the opposite sides. The two ends of the segment crane are respectively embedded in the slide rails through traveling wheels and move along the slide rails. The elastic support includes a support plate fixedly installed on the fixed column and a spring connecting the support plate and the hoisting track.

[0016] The preferred technical solution of the present invention: The split starting device further includes a temporary fuel tank and an oil pump arranged on the bridge. A fuel tank mounting plate is provided on the bridge, and the temporary fuel tank and the oil pump are both installed on the fuel tank mounting plate.

[0017] The beneficial effects of the present invention:

[0018] (1) The muck conveying belt of the present invention is set to be telescopic, and its length can be adjusted after the shield tunneling for a certain distance, which improves the single muck output volume, thereby improving the shield construction efficiency and ensuring the starting safety. The telescopic process of the telescopic belt is carried out by the rotation of the screw rod, which ensures the stability of the telescopic movement. Opposing pinch rollers are designed at the front and rear of the telescopic section to ensure the stable operation of the belt system and the cleaning of the surface.

[0019] (2) In the present invention, the telescopic part of the telescopic belt is arranged in the belt part below the muck conveying belt. During the telescopic process, the inclined surface of the belt itself will not be changed, which is convenient for carrying muck, reduces the difficulty of muck transportation, and increases the height of the lower belt, leaving more space for placing muck buckets below the muck conveying belt, and increasing the extension of the muck bucket in the direction of the slag outlet. When the belt is in the extended state, the length of the inclined part of the belt is not extended, but the length of the horizontal part is increased, which can increase the number of muck buckets and reduce the number of horizontal transportation times.

[0020] (3) Only the main machine of the shield machine is installed in the working well of the present invention. In order to improve the construction efficiency, a special bridge structure is designed. The bridge is designed with a separate frame structure, with fewer trusses, simple layout, and stable force. The bridge structure is designed with 4 columns and equipped with traveling wheels, which can travel independently, and the traveling wheel track can share the sleeper of the muck truck track without separate design. The bridge of the present invention can be adjusted vertically or horizontally. As the shield machine advances forward, the bridge structure can be continuously extended to increase the storage space for supporting devices. By changing the height of the rear part of the bridge, there is space for the muck bucket to move forward, ensuring the loading capacity of the muck bucket, reducing the difficulty of slag discharge, and ensuring continuous and rapid construction of the shield starting. Moreover, the telescopic structure of the bridge is designed as a telescopic sleeve, and a mechanical bolt is installed to lock it after the telescopic operation to ensure safety.

[0021] (4) The segment crane in the bridge of the present invention is designed with two forms of articulated connection and sliding connection. When the bridge expands and contracts horizontally, the end of the segment crane track can move along the sliding device. When the bridge expands and contracts vertically, the front end of the segment crane track can rotate around the articulated device. These two connection forms ensure that the force remains unchanged after the bridge structure size is adjusted and no abnormal force occurs. The front column structure of the bridge is designed with a buffer structure to ensure the stable force and safe operation of the track hoisting system and avoid shaking during the hoisting process. Its hoisting system can hoist to the assembly area at one time and directly assemble, avoiding frequent transfer and collision damage of the segments.

[0022] (5) There is only one hoisting wellhead in the present invention. Due to the limited horizontal transportation distance, a winch structure is adopted to reduce the occupied length, and the reciprocating motion is realized through the forward and reverse rotation transportation of the winch, avoiding the power problems on the uphill, downhill and horizontal sections.

[0023] (6) A relay station is designed for the hydraulic system of the present invention. A temporary oil tank and a hydraulic pump are installed on the bridge structure to transfer and store the oil fluid, ensuring the stable oil pressure and uninterrupted oil fluid of the hydraulic system. Description of the Drawings

[0024] Figure 1 is the structural schematic diagram of the present invention;

[0025] Figure 2It is a schematic structural diagram of the bridge in the present invention;

[0026] Figure 3 It is a schematic diagram of the contracted state of the cross beam and longitudinal beam of the bridge in the present invention;

[0027] Figure 4 It is a schematic diagram of the extended state of the cross beam and longitudinal beam of the bridge in the present invention;

[0028] Figure 5 It is a schematic diagram of the internal structure of the connection part between the hoisting track and the cross beam of the bridge in the present invention;

[0029] Figure 6 It is a longitudinal sectional view of the connection part between the hoisting track and the cross beam of the bridge in the present invention;

[0030] Figure 7 It is a schematic diagram of the connection between the hoisting track and the bridge column in the present invention;

[0031] Figure 8 It is a schematic diagram of the contracted state of the muck conveying belt in the present invention;

[0032] Figure 9 It is a schematic diagram of the belt layout in the contracted state;

[0033] Figure 10 It is a schematic diagram of the extended state of the muck conveying belt in the present invention;

[0034] Figure 11 It is a schematic diagram of the belt layout in the extended state;

[0035] Figure 12 It is a schematic structural diagram of the telescopic mechanism of the muck conveying belt in the present invention;

[0036] Figure 13 It is a schematic structural diagram of the horizontal transport trolley in the present invention;

[0037] Figure 14 It is a schematic diagram of the state where the belt is contracted and the bridge is extended in the present invention;

[0038] Figure 15 It is a schematic diagram of the state where both the bridge and the belt are extended in the present invention;

[0039] Figure 16 It is a schematic diagram of the horizontal transport trolley transporting segments in the present invention;

[0040] Figure 17 It is a schematic diagram of the horizontal transport school bus transporting the muck bucket in the present invention.

[0041] In the figure: 1 - muck conveying belt, 100 - belt support, 101 - conveying belt, 102 - driving belt roller, 103 - driven belt roller, 104 - chute, 105 - hydraulic cylinder, 106 - first adjusting belt roller, 107 - second adjusting belt roller, 108 - mounting base, 109 - retaining plate, 110 - connecting bracket, 111 - first adjusting screw, 112 - first control motor, 113 - screw sleeve, 2 - telescopic bridge, 200 - telescopic cross beam, 2001 - fixed beam, 2002 - telescopic beam, 2003 - lateral adjusting cylinder, 2004 - first locking bolt, 201 - horizontal connecting rod, 202 - fixed column, 203 - height adjustable column, 204 - track mounting groove, 205 - belt mounting frame, 206 - traveling mechanism, 207 - longitudinal adjusting cylinder, 208 - second locking bolt, 209 - fuel tank mounting plate, 3 - shield muck outlet, 4 - shield main machine, 5 - hoisting track, 500 - slide rail, 6 - segment crane, 7 - elastic support, 700 - support plate, 701 - spring, 8 - hinge member, 9 - second adjusting screw, 10 - threaded adjusting sleeve, 11 - traveling wheel, 12 - second control motor, 13 - winch, 14 - transport trolley, 15 - towing wire rope, 16 - first towing pulley, 17 - second towing pulley, 18 - shield segment, 19 - muck bucket, 20 - temporary fuel tank, 21 - oil pump. Detailed implementation manners

[0042] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. The Figures 1 to 16 All are the drawings of the embodiments, which are drawn in a simplified manner and are only used to clearly and concisely illustrate the purpose of the embodiments of the present invention. The technical solutions shown in the drawings below are the specific solutions of the embodiments of the present invention and are not intended to limit the scope of the present invention to be protected. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0043] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings, or the orientation or positional relationships in which the products of the present invention are usually placed during use, or the orientation or positional relationships commonly understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0044] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and defined, terms such as "installation" and "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] An embodiment provides a shield split launch device for a limited space. The split launch device includes a shield main machine 4, a telescopic muck conveyor belt 1, a telescopic bridge 2, and a hoisting system. The muck conveyor belt 1 is installed at the position of the shield muck outlet 3 at the tail of the shield main machine 4 through the telescopic bridge 2. As Figure 13 shown, the split launch device further includes a horizontal transportation system. The horizontal transportation system consists of a winch 13, a transportation trolley 14, and a pulley traction mechanism. The winch 13 is installed at the position of the hoisting shaft. The pulley traction mechanism includes a traction steel wire rope 15 and a first traction pulley 16 and a second traction pulley 17 respectively arranged on the front and rear sides of the transportation trolley 14. The first traction pulley 16 is installed near the winch 13, and the second traction pulley 17 is installed near the shield main machine 4. One end of the traction steel wire rope 15 is fixed on the side of the transportation trolley 14 near the winch 13, and the other end winds around the roller of the winch 13 and then successively winds around the first traction pulley 16 and the second traction pulley 17 and is fixedly connected to the side of the transportation trolley 14 away from the winch 13. The transportation trolley 14 in the present invention can be used to transport tunnel segments, as Figure 16 shown, or can be used to transport muck buckets, as Figure 17 shown. The horizontal transportation system in the present invention realizes circular motion through the forward and reverse rotation transportation of the winch 13, avoiding power problems on uphill, downhill, and horizontal sections. The first traction pulley 16 near the winch 13 is a fixed pulley, ensuring that the height of the transportation steel wire rope is lower than the track surface and does not affect the driving of the transport vehicle. The position of this fixed pulley remains unchanged. Near the shield main machine 4, a fixed pulley is installed on the assembled segments as the second traction pulley 17 to achieve commutation. This fixed pulley moves forward synchronously with each extension of the track as the shield advances forward. When the distance is short, the length adjustment of the traction steel wire rope 15 is designed to extend on the side of the transportation trolley 14 near the winch 13. When the distance is long, it is designed at the middle position between the two traction fixed pulleys to ensure that the connection joint does not enter the drum of the winch 13 and ensure that the traction steel wire rope 15 is not damaged.

[0046] An embodiment provides a shield split launch device for a limited space, as Figures 2 to 4As shown in the figure, the telescopic bridge 2 includes two sets of parallel frames, which are connected by a horizontal connecting rod 201. Each set of frames includes a telescopic crossbeam 200, a fixed column 202, and a height-adjustable column 203. The telescopic crossbeam 200 includes a fixed beam 2001, a telescopic beam 2002, and a lateral adjustment oil cylinder 2003. The fixed column is close to the shield main machine 4. The fixed column 202 is arranged at the free end of the telescopic beam 2002, and its top is hinged to the telescopic beam 2002. The height-adjustable column 203 is arranged at the free end of the fixed beam 2001, and its top is hinged to the fixed beam 2001. When the height of the height-adjustable column 203 is adjusted, it will not affect the normal use of the bridge. A track installation groove 204 and a belt installation frame 205 are provided on the fixed beam 2001. A plurality of installation holes are provided on the belt installation frame 205, and the fixed position of the belt can be adjusted. The telescopic beam 2002 is nested with the fixed beam 2001, and a plurality of adjustment screw holes are correspondingly provided at the connection part. The cylinder body of the lateral adjustment oil cylinder 2003 is installed on the fixed beam 2001, and the piston end is installed on the telescopic beam 2002 through a bracket. Under the action of the lateral adjustment oil cylinder 2003, the telescopic beam 2002 moves along the telescopic sleeve at the end of the fixed beam 2001, and after moving to the set position, it is fixed and locked by a plurality of first locking bolts 2004. The height-adjustable column 203 includes a telescopic column and a longitudinal adjustment oil cylinder 207 that are nested with each other, and the height of the telescopic column is adjusted under the action of the longitudinal adjustment oil cylinder 207. After adjusting to the set position, it is fixed and locked by a plurality of second locking bolts 208. As Figure 1 shown, traveling mechanisms 206 are respectively provided at the bottoms of the fixed column 202 and the height-adjustable column 203. The split launch device further includes a temporary fuel tank 20 and an oil pump 21 provided on the telescopic bridge 2. A fuel tank mounting plate 209 is provided on the telescopic bridge 2. The fuel tank mounting plate 209 is mounted at a relatively empty position on the telescopic bridge 2, which will not affect the installation and use of other devices. The temporary fuel tank 20 and the oil pump 21 are both mounted on the fuel tank mounting plate 209. The temporary fuel tank 20 is communicated with the fuel tank of the shield machine itself and is connected to each hydraulic subsystem in the shield main machine 4 through a hydraulic pipeline to provide temporary hydraulic oil for shield launching. A liquid level sensor is provided in the temporary fuel tank 20, and the liquid level sensor is signal-connected to the control system of the oil pump 21, and the operation of the oil pump 21 can be controlled according to the liquid level in the fuel tank 20.

[0047] A split launch device for a shield in a limited space provided by the embodiment, such as Figures 1 to 4As shown in the figure, the hoisting system includes two hoisting rails 5 and a segment crane 6 slidably connected between the two hoisting rails 5. One end of each hoisting rail 5 is installed in the rail installation groove 204 through an adjusting mechanism, and the other end extends downward towards the fixed column 202, horizontally extending out of the bridge to the shield tail area, and is hingedly connected to the tail end of the shield main machine 4 through a hinge member 8. Each hoisting rail 5 is connected to the corresponding fixed column 202 through an elastic support 7; as Figure 5 and Figure 6 As shown in the figure, the adjusting mechanism includes a second adjusting screw 9 horizontally arranged in the rail installation groove 204 and a threaded adjusting sleeve 10 fixedly arranged at the end of the hoisting rail 5. The threaded adjusting sleeve 10 is threadedly connected to the second adjusting screw 9; both ends of the second adjusting screw 9 are rotatably connected to the ends of the rail installation groove 204 through bearings, and one end extends out of the rail installation groove 204 and is provided with a second control motor 12; the adjusting mechanism and the lateral adjusting oil cylinder 2003 work synchronously. As Figure 7 As shown in the figure, the slide rails 500 of the two hoisting rails 5 are arranged on opposite sides. Both ends of the segment crane 6 are respectively embedded in the slide rails 500 through walking wheels 11 and move along the slide rails 500; the elastic support 7 includes a support plate 700 fixedly installed on the fixed column 202 and a spring 701 connecting the support plate 700 and the hoisting rail 5.

[0048] A shield split launch device for a limited space provided by the embodiment, as Figure 1 As shown in the figure, the telescopic muck conveying belt 1, the inclined muck conveying belt corresponding to the shield muck outlet at the lower end, as Figures 8 to 11 As shown in the figure, the muck conveying belt 1 includes a belt support 100, a conveying belt 101, a driving belt roller 102 and a driven belt roller 103. The main drive motor of the muck conveying belt 1 is an in-built motor, and the motor is arranged inside the driving belt roller 102. The belt uses a material with a relatively high coefficient of friction; the driving belt roller 102 of the muck conveying belt is located at the high end away from the shield muck outlet 3. The hydraulic cylinders 105 are symmetrically arranged at both ends of the driving belt roller 102; the mounting bases 108 of the hydraulic cylinders 105 are fixed on the belt mounting frame 205 through bolts, and the mounting positions are movable. The length of the belt support 100 is the length of the inclined section of the muck conveying belt 1, and retaining plates 109 are arranged on both sides of the belt in the inclined section of the muck conveying belt 1. The muck conveying belt 1 is fixed on the telescopic bridge 2 through a connecting bracket 110, and multiple mounting positions for mounting the connecting bracket 110 are reserved on the telescopic bridge 2, which can be used to adjust the mounting position of the muck conveying belt 1; multiple connecting brackets 110 are provided, the lower ends are fixed on the belt support 100 of the muck conveying belt 1, and the upper ends are fixed on the telescopic bridge 2 through multiple screws; the telescopic bridge 2 is a length-adjustable telescopic bridge.

[0049] The muck conveying belt 1 in the embodiment, as Figures 8 to 11 shown, the conveying belt 101 is a telescopic belt, including a fixed area above the belt support 100 and a telescopic area below the belt support 100. The telescopic area includes two first adjusting belt rollers 106 and second adjusting belt rollers 107 with different heights. On both sides of the belt support 100, two groups of chutes 104 are symmetrically arranged. Each group of chutes 104 includes two parallel strip-shaped grooves. The two ends of the first adjusting belt roller 106 are slidably connected to the upper strip-shaped groove, and the two ends of the second adjusting belt roller 107 are slidably connected to the lower strip-shaped groove. Under the control of the telescopic mechanism, the two adjusting belt rollers move in opposite directions along the corresponding strip-shaped grooves. At both ends of the driving belt roller 102 at the high end of the muck conveying belt away from the shield muck outlet 3, hydraulic cylinders 105 are symmetrically arranged. The hydraulic cylinders 105 are fixed on the horizontal cross beam of the telescopic bridge 2 through the mounting base 108. Under the traction of the hydraulic cylinders 105 and the adjustment of the telescopic mechanism, the movement of the two adjusting belt rollers drives the belt in the telescopic area to stretch and extend, increasing the belt length of the horizontal section of the muck conveying belt 1, or overlapping and contracting to shorten the belt length of the horizontal section of the muck conveying belt 1. When the single stroke contraction of the hydraulic cylinder 105 is completed, the installation position of the connecting bracket 110 can be changed to repeat the telescoping to ensure that the belt is fully extended. As Figure 2 shown, when the belt in the telescopic area of the conveying belt 101 is in a contracted state, the first adjusting belt roller 106 in the upper strip-shaped groove is located at the low end of the strip-shaped groove, and the second adjusting belt roller 107 in the lower strip-shaped groove is located at the high end of the strip-shaped groove; the high-end part of the belt in the telescopic area of the conveying belt 101 is integrated with the belt in the fixed area around the high-end belt roller of the muck conveying belt 1, and after winding around the first adjusting belt roller 106 in the upper strip-shaped groove from the high end to the low end, it returns from the low end to the high end and winds around the second adjusting belt roller 107 and then extends towards the low end, being integrated with the belt in the fixed area around the low-end belt roller of the muck conveying belt 1; this design method can increase the height of the upper belt, thereby increasing the storage space for the muck bucket. As Figure 12 shown, the telescopic mechanism includes first adjusting screws 111 arranged on both sides of each adjusting belt roller and first control motors 112 arranged at the ends of each first adjusting screw 111. The first control motors 112 are fixed on the belt support 100. The other end of the first adjusting screw 111 is fixed on the belt support 100 through a rotating bracket. The two ends of each adjusting belt roller 106 are threadedly sleeved on the corresponding first adjusting screw 111 on the corresponding side through a screw sleeve 113. The first adjusting screws 111 on both sides of each adjusting belt roller rotate simultaneously under the action of the first control motor 112, thereby driving the adjusting belt roller to move along the adjusting screw through the screw sleeve 113; the first control motors 112 of the first adjusting belt roller 106 and the second adjusting belt roller 107 move synchronously and in opposite directions.

[0050] The following is a further description of the use of the present invention in conjunction with a specific embodiment. The shield main machine 4 in the embodiment uses an earth pressure balance shield machine. The slag discharge method is to transport the slag from the front of the cutter disc to the horizontal transportation slag bucket through a screw conveyor and a belt system. After being transported to the wellhead by the horizontal transportation system, it is lifted to the ground by the vertical transportation system to complete the slag discharge. Since the shield starting space of this construction project is limited, only large-scale split starting can be carried out. Large-scale split means no trolley installation, that is, only the shield main machine is installed in the working well. In order to improve the construction efficiency, a special bridge structure is designed, and the horizontal direction and rear side columns of the bridge are both retractable to meet the requirements of different sizes and slopes; and a retractable belt is provided to adapt to the use in wellheads of different lengths; the horizontal transportation system is designed with a low-profile transport vehicle, which can complete the transportation of pipe segments and slag at the same time, and is tractioned by a winch cycle, which can adapt to transportation of various slopes; the device is designed according to the different working conditions of the shield split starting, and fully considers the construction difficulty and risk, which provides convenience for efficient on-site construction and saves costs.

[0051] The bridge of the present invention is provided with a traveling mechanism 206, the lower surface of which is on the same horizontal line, and the traveling mechanism 206 can meet the weight requirement of the transported materials. In specific use, the hoisting track 5 and the telescopic slag conveying belt 1 are installed on the bridge, the upper end of the hoisting track 5 is installed in the track mounting groove 204 of the telescopic bridge 2 through the adjusting mechanism, the hoisting track 5 extends downward to the fixed column 202, and is connected to the fixed column 202 through the elastic bracket 7, and then extends horizontally to the shield area, and is connected to the H-shaped steel hinge of the shield tail of the shield main machine 4 through the hinge member 8; then the slag conveying belt 1 is installed on the telescopic bridge 2, the hydraulic cylinders at both ends of the active belt roller 102 of the slag conveying belt 1 are fixed on the belt mounting frame 205 of the telescopic bridge 2 through the mounting base 108, the temporary oil tank 20 and the oil pump 21 are installed on the oil tank mounting plate 209, and the trolley pipeline is installed and connected, and the shield can be started.

[0052] In the case of limited space, first Figure 1 As shown, the telescopic bridge 2 and the slag conveyor belt 1 are both in the retracted state. At this time, the belt has only an inclined section. The shield is started, and the segments are transported by the transport trolley 14. The shield segments are transported to the bottom of the telescopic bridge 2, and then the segments are transported to the shield tail by the lifting system for segment assembly. When the segments are lifted, the columns only support the slag conveyor belt 1. Figure 14As shown in the figure, the height of the rear height-adjustable column 203 is adjusted by the longitudinal adjustment cylinder 207 to increase the height of the tail of the belt conveyor. After adjusting to the appropriate height, it is fixed and locked by the second adjustment bolt 208. By adjusting the height of the tail of the muck conveying belt 1, the storage space of the muck bucket is increased. As the muck bucket moves forward filled away from the shield tail side, the height of the height-adjustable column 203 can be gradually reduced by the longitudinal adjustment cylinder 207, and the height of the tail of the belt conveyor is synchronously reduced, making the inclination of the muck-carrying surface of the belt conveyor smaller, facilitating muck carrying and improving construction efficiency. After the shield starts tunneling for a certain distance, when there is a little more space in the shield tail, the first adjustment bolt of the telescopic cross beam 200 of the telescopic bridge 2 can be loosened, and then the lengths of the two are adjusted by the transverse adjustment cylinder 2003. After adjusting to the appropriate length, it is fixed and locked by the first locking bolt 2004. While adjusting the length of the bridge, the second adjustment screw 9 is controlled by the control motor to adjust the hoisting track 5 to move accordingly, avoiding affecting the normal operation of the hoisting track 5 during the length adjustment process. At the same time, the first control motor 112 rotates the first adjustment screws 111 on both sides of the two adjustment belt rollers simultaneously, driving the two adjustment belt rollers to move simultaneously, and the moving directions of the two adjustment belt rollers are opposite. The first adjustment belt roller 106 in the upper chute moves upward, and the second adjustment belt roller 107 in the lower chute moves downward. While moving, the belt is pulled by the hydraulic cylinder 105 to stretch the belt. Since the stroke of the hydraulic cylinder 105 is limited, in order to meet the traction requirement for the moving distance, the position of the hydraulic cylinder 105 can be horizontally moved to ensure that the conveyor belt 101 can be fully unfolded, as Figure 15 shown. At this time, the horizontal section of the conveyor belt 101 is extended, so the number of muck buckets can be increased, and the muck discharging speed is accelerated, thereby improving the efficiency of the shield starting. After the split tunneling progresses 10 rings, the negative rings can be removed to increase the hoisting space. After tunneling about 50 m or meeting the storage length of the trolley, the above-mentioned bridge can be removed for secondary installation debugging and normal construction.

[0053] As mentioned above, this is only one embodiment of the present invention, and its description is relatively specific and detailed, but it should not be construed as a limitation to the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A shield split starting device for use in a limited space, characterized in that: The split launching device includes a shield main machine (4), a telescopic muck conveying belt (1), a telescopic bridge (2) and a hoisting system. The muck conveying belt (1) is installed at the position of the shield muck outlet (3) at the tail of the shield main machine (4) through the bridge (2). The bridge (2) includes two groups of parallel frames, which are connected by a horizontal connecting rod (201). Each group of frames includes a telescopic cross beam (200), a fixed column (202) and a height-adjustable column (203). The fixed column (202) and the height-adjustable column (203) are respectively arranged at both ends of the telescopic cross beam (200), and the fixed column is close to the shield main machine (4). On one side of the telescopic cross beam (200) close to the height-adjustable column (203), there are a track installation groove (204) and a belt installation frame (205); The hoisting system includes two hoisting tracks (5) and a segment crane (6) slidably connected between the two hoisting tracks (5). One end of each hoisting track (5) is installed in the track installation groove (204) through an adjusting mechanism, and the other end extends downward towards the fixed column (202), horizontally extends out of the bridge to the shield tail area, and is hinged to the H-shaped steel at the tail end of the shield main machine (4) through a hinge member (8). Each hoisting track (5) is connected to the corresponding fixed column (202) through an elastic support (7); The muck conveying belt (1) is located between the two groups of frames, one end is installed on the belt installation frame (205), and the other end extends downward and obliquely to the position of the shield muck outlet (3) of the shield main machine (4). The muck conveying belt (1) includes a belt support (100), a conveying belt (101), a driving belt roller (102) and a driven belt roller (103). The belt support (100) is connected to the bridge (2) through a plurality of connecting brackets (110); The conveying belt (101) is a telescopic belt, including a fixed area above the belt support (100) and a telescopic area below the belt support (100). The telescopic area includes two first adjusting belt rollers (106) and a second adjusting belt roller (107) with different heights. After the belt in the telescopic area sequentially winds around the two adjusting belt rollers, its two ends respectively wind around the driving belt roller (102) and the driven belt roller (103) and are connected to the belt in the fixed area as a whole; On both sides of the belt support (100), two groups of sliding grooves (104) are symmetrically arranged. Each group of sliding grooves (104) includes two parallel strip-shaped grooves. The two ends of the two adjusting belt rollers are respectively slidably connected to the corresponding strip-shaped grooves, and under the control of the telescopic mechanism, the two adjusting belt rollers move in opposite directions along the corresponding strip-shaped grooves. Hydraulic cylinders (105) are symmetrically arranged at both ends of the belt roller at the high end of the muck conveying belt away from the shield muck outlet (3). The two hydraulic cylinders (105) are fixed on the belt installation frame (205) of the bridge (2) through a mounting base (108). Under the action of the hydraulic cylinders (105) and the telescopic mechanism, the movement of the two adjusting belt rollers drives the belt in the telescopic area to stretch and extend or overlap and shorten.

2. The shield split launch device for use in a confined space according to claim 1, characterized in that: The split starting device further includes a horizontal transportation system; the horizontal transportation system consists of a hoist (13), a transportation trolley (14) and a pulley traction mechanism. The hoist (13) is installed at the position of the hoisting shaft. The pulley traction mechanism includes a traction steel wire rope (15) and a first traction pulley (16) and a second traction pulley (17) respectively arranged on the front and rear sides of the transportation trolley (14). The first traction pulley (16) is installed near the hoist (13), and the second traction pulley (17) is installed near the shield main machine (4). One end of the traction steel wire rope (15) is fixed on one side of the transportation trolley (14) near the hoist (13), and the other end is wound around the roller of the hoist (13) and then successively wound around the first traction pulley (16) and the second traction pulley (17) and fixedly connected to the side of the transportation trolley (14) far from the hoist (13).

3. A shield split launching device for use in a limited space according to claim 1 or 2, characterized in that: When the telescopic belt of the conveyor belt (101) is in a contracted state, the first adjusting belt roller (106) of the upper strip groove is located at the lower end of the strip groove, and the second adjusting belt roller (107) of the lower strip groove is located at the upper end of the strip groove; the high-end part of the telescopic belt of the conveyor belt (101) is integrated with the fixed belt around the high-end belt roller of the muck conveyor belt (1), and after winding around the first adjusting belt roller (106) in the upper strip groove from the high end to the low end, it returns from the low end to the high end and winds around the second adjusting belt roller (107) and then extends towards the low end, and is integrated with the fixed belt around the low-end belt roller of the muck conveyor belt (1); under the traction of the hydraulic cylinder (105) and the adjustment of the telescopic mechanism, the belt in the telescopic area extends or contracts the belt length of the horizontal section of the muck conveyor belt (1).

4. A shield split launch device for use in a confined space according to claim 1 or 2, characterized in that: The driving belt roller (102) is located at the high end far from the shield slag outlet (3), and the hydraulic cylinders (105) are symmetrically arranged at both ends of the driving belt roller (102); a plurality of mounting holes are provided on the belt mounting frame (205), and the mounting holes are equidistantly distributed on the belt mounting frame (205). The mounting base (108) of the hydraulic cylinder (105) is fixed on the belt mounting frame (205) by bolts, and the mounting position is movable.

5. A shield split launching device for use in a limited space according to claim 1 or 2, characterized in that: The telescopic mechanism includes first adjusting screws (111) arranged on both sides of each adjusting belt roller and first control motors (112) arranged at the ends of each first adjusting screw (111). The first control motors (112) are fixed on the belt bracket (100). The other ends of the first adjusting screws (111) are fixed on the belt bracket (100) through rotating brackets. Both ends of each adjusting belt roller are threadedly sleeved on the corresponding first adjusting screw (111) on each side through screw sleeves (113). The first adjusting screws (111) on both sides of each adjusting belt roller rotate simultaneously under the action of the first control motor (112), so as to drive the adjusting belt roller to move along the adjusting screw through the screw sleeve (113); the first control motors (112) of the first adjusting belt roller (106) and the second adjusting belt roller (107) move synchronously and in opposite directions.

6. The shield split launching device for a confined space according to claim 1 or 2, characterized in that: The main drive motor of the muck conveying belt (1) is an in-built motor, and the motor is arranged inside the driving belt roller (102); the length of the belt bracket (100) is the length of the inclined section of the muck conveying belt (1), and retaining plates (109) are arranged on both sides of the belt in the inclined section of the muck conveying belt (1).

7. A shield split launch device for use in a limited space according to claim 1 or 2, characterized in that: The telescopic cross beam (200) includes a fixed beam (2001), a telescopic beam (2002) and a lateral adjusting oil cylinder (2003). The fixed column (202) is arranged at the free end of the telescopic beam (2002), and its top end is hinged to the telescopic beam (2002). The height-adjustable column (203) is arranged at the free end of the fixed beam (2001), and its top end is hinged to the fixed beam (2001). A track installation groove (204) is arranged on the fixed beam (2001); the telescopic beam (2002) is nested with the fixed beam (2001), and a plurality of adjusting screw holes are correspondingly arranged at the connection part; the cylinder body of the lateral adjusting oil cylinder (2003) is installed on the fixed beam (2001), and the piston end is installed on the telescopic beam (2002) through a bracket. Under the action of the lateral adjusting oil cylinder (2003), the telescopic beam (2002) moves along the telescopic sleeve at the end of the fixed beam (2001), and after moving to the set position, it is fixed and locked through a plurality of first locking bolts (2004); the height-adjustable column (203) includes a telescopic column and a longitudinal adjusting oil cylinder (207) nested with each other, and the height of the telescopic column is adjusted under the action of the longitudinal adjusting oil cylinder (207). After adjusting to the set position, it is fixed and locked through a plurality of second locking bolts (208).

8. A shield split launch device for use in a limited space according to claim 1 or 2, characterized in that: The bottoms of the fixed vertical columns (202) and the height-adjustable vertical columns (203) are respectively provided with traveling mechanisms (206); the adjusting mechanism includes a second adjusting screw rod (9) horizontally arranged in the track installation groove (204) and a threaded adjusting sleeve (10) fixedly arranged at the end of the hoisting track (5), and the threaded adjusting sleeve (10) is threadedly connected with the second adjusting screw rod (9); both ends of the second adjusting screw rod (9) are rotatably connected with the ends of the track installation groove (204) through bearings, one end of which extends out of the track installation groove (204) and is provided with a second control motor (12); the adjusting mechanism and the lateral adjusting oil cylinder (2003) work synchronously.

9. A shield split launch device for use in a confined space according to claim 1 or 2, characterized in that: The slide rails (500) of the two hoisting tracks (5) are arranged on opposite sides, and both ends of the segment crane (6) are respectively embedded in the slide rails (500) through traveling wheels (11) and move along the slide rails (500); the elastic support (7) includes a support plate (700) fixedly installed on the fixed vertical column (202) and a spring (701) connecting the support plate (700) and the hoisting track (5).

10. A shield split launch device for use in a limited space according to claim 1 or 2, characterized in that: The split launching device further includes a temporary fuel tank (20) and an oil pump (21) arranged on the bridge (2), and a fuel tank mounting plate (209) is arranged on the bridge (2), and both the temporary fuel tank (20) and the oil pump (21) are installed on the fuel tank mounting plate (209).

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