Complex for tunnel excavation in weak ground

FIELD: mining, particularly to excavate Metro tunnels in instable rock with ground structure keeping in undamaged state.

SUBSTANCE: complex comprises working tool made as removable faceplate 10 with cutters 11 arranged over faceplate surface, protective shell made as cantilever 14 fixedly secured to faceplate 10 perimeter, working tool advancing mechanism 13 and block laying means. Removable faceplate 10 is provided with windows 17 for preliminary face weakening and cut rock removal and with two hydraulic cylinders for faceplate 10 retention. The hydraulic cylinders have extendible stops 15 and is fastened to rotary lever 5 installed on load-bearing frame 2 of block laying means connected to advancing mechanism 13. One end of rotary lever 5 is provided with grip 6 for tubing 7, which may be substituted for hydraulic hammer 8.

EFFECT: increased tunnel excavation rate and operational safety, decreased time of prior tunnel lining, improved tunnel shaping accuracy and increased advancing speed.

7 dwg

 

The complex is intended for carrying out excavations in unstable rocks in the underground space beneath the city buildings of great intensity and representing architectural or historical value.

The known method [for RF patent No. 2209978, IPC E21D 9/00, publ. 2003] the construction of shallow tunnels using tunnel shield. The method of tunnel construction includes the construction of the inlet and outlet ditches, driving from the output of the pit along the constructed tunnel guide hole with a gasket in it fixing pipes, placement in the input jacking pit station, the extension of the well while carrying out the processes of extrusion of the bore of the mounting pipe under the action of the jacking station, excavation in the mine and its shipment, the lining of the tunnel. Squeezing the mounting pipe is produced by introducing into the well fixed on the front end of the shield of the pressure cylinder and subsequent exposure through him at her. The extension of the guide bore monitoring pressure cylinder in the lower part of the shield in the pit, having in cross section the form of an arch, base width which exceeds the diameter of the guide bore and the top of which is inscribed the contour of the guide hole. Device for tunnel construction includes a shield with nagourney what under and hydraulic cylinders control, jacking station and installation for development and transportation of soil. The shield is provided with a screw-down cylinder fixedly attached by one end to the front end of Nieuport section. Its shell is made in cross-section in the form of an arch, base width which exceeds the outer diameter of the pressure cylinder and the outer contour of the latter in its cross-section are inserted in the outer contour of the top of the shell. Installation for development and transportation of soil placed over the pressure cylinder in the lower part of the shield. However, the workings with such a tunneling shield impossible for the excavation of tunnels and chambers, especially auxiliary minor length, as the cost and time of the workings increase due to the complexity of installation and dismantling works, also this method requires a large amount of drilling and high complexity of the service.

There is also known a method of tunneling [RF patent No. 2167300, IPC E21D 9/00, publ. 2001] in moderately and weakly resistant soils. The method includes the installation of security screens from pipes and rock excavation under the protection of these screens. The pipe with the cut on the ends of the teeth is pushed parallel to the axis of the tunnel from the tunneling shield around the perimeter of the tunnel with simultaneous periodic turns clockwise and counterclockwise, or in what adenium around the axis, and when tunneling in clay soils before pushing pipe shield unload the rock in front of the face of the wells that are on the path of the tunnel. The device for implementing the method comprises a tunneling shield, drilling machine for attenuation of the array and protective screens. The use of this method, the workings reduces the cost of finishing tunnel, but this method requires very large amounts of drilling operations, difficulty moving the drilling machine within the tunnel complex and low performance.

It is known device [RF patent No. 2096622, IPC E21D 9/00, publ. 1997], where for the construction of tunnels deep under the surface in moderately and weakly resistant soils are encouraged to use the advanced lining. The inventive device for the construction of tunnels deep under the surface in moderately and weakly resistant soils by the method of anticipatory lining has a self-propelled gantry frame, on which are mounted front and rear arc guides of the same diameter, in which each side of the tunnel there are movable carriage with the console and the drive motion of the hinge connected to the longitudinal frame with slots that have podlesochna machine equipped with hydraulic cylinders longitudinal movement connected to the longitudinal frame, n is each carriage has a lifting cylinder, one end supported on the console of the carriage, and the other associated with longitudinal lifting frame with swing, each podlesochna the machine is made with the possibility of rotation of the cutting body in the plane of the cutting at a right angle and cutting grooves in the sole of the tunnel along its walls. However, such a device has the following disadvantages: protect only the upper part of the tunnel, the difficulty of inscribing in the dimensions section workings electric machine, the cycle of operation.

It is known device [RF patent No. 2211925, IPC E21D 9/06, publ. 2003], adopted as a prototype for the construction of tunnels large extent under the sea or river bottom are encouraged to use mechanized tunneling shield without excavation provided shallow shield from the bottom of the sea or the river to the arch, the height of which varies from 1 to 10 m, depending on soil type and profile of the bottom. The objective of the invention is to improve the functionality and efficiency of the shield. Mechanised shield consists of item destruction of rock, shell shield for safe operations and placement mechanisms of movement imposed on the supporting ring, the sealing device to prevent rocks in the tunnel and contains a blank separating the work area from the face wall, the perimeter of which are mounted brands oity. The element of destruction breeds made in the form of tapered faceplate reversing the rotation elements of the cutting blade and the cells that serves liquefied soil to the vaulted part of the shield and create conditions spreading soil over the tunnel and the water space. The diameter of the tapered faceplate may exceed the diameter of the shield, and in this embodiment, the axis of the shield is shifted by the difference of the diameters. The disadvantages of this device are large metal tunneling machine, the complexity of assembling and dismantling and low productivity.

The technical result of the invention is to eliminate these drawbacks of the device, namely the simplification of the structure and Assembly and dismantling of the complex.

The technical result is achieved by the fact that in the complex for the workings in moderately and weakly resistant rocks containing the working body in the form of a removable faceplate with blades across its surface, the protective sheath, the mechanism of movement of the working body and blogocracy, according to the invention a protective sheath made in the form of console, rigidly fixed with the opportunity to hold the roof, the sides and the bottom hole on the faceplate, which is made with Windows for pre-weakening slaughtering and cleaning of destroyed rock has two retaining its cylinders with you is bignami brakes and fixed to the rotary arm, installed on a frame of belcolade associated with the mechanism of movement, and at one end of the pivot arm is a clamp for tubing made with the possibility of replacing it with a hammer,

The use of more simple construction of the complex for the workings in moderately and weakly resistant rocks will reduce the time and amount of preliminary attachment.

The proposed complex is illustrated by drawings. Figure 1 shows a longitudinal section; figure 2 shows a view of a complex of figure 1; figure 3 shows a weakening of the array of bumps bit breaker; figure 4 and 5 shows the destruction of the face working body on the width of the ring lining; figure 6 - mounting goaf tubing; 7 - temporary retention faceplate telescopic tubes with boards and pins.

The complex consists of the uprights 1, frame 2, brace 3, the reinforcing beam 4. Blogocracy equipped with the swing lever 5 grip 6 for segment 7 (6) or for breaker 8 (figure 3). The rotary lever 5 with fasteners 9 has a working body in the form of a removable face-plate 10, on which the side face parts are the cutters 11 over the entire surface of the faceplate so that the entire set of cutters performs simultaneous destruction of the face. On a frame 2 mounted actuator 12 turnovers the Oia rotary lever 5, the transfer mechanism 13 belcolade, hydraulic equipment, electrical equipment and retractable platform (not shown). The retention of the roof, the sides and the bottom is a protective sheath in the form of console 14 rigidly mounted on a removable plate 10, and hold the faceplate 10 from tipping over is retractable stoppers 15 of the hydraulic cylinders 16, rigidly mounted on the removable plate 10. Pre-weakening of the face is carried out by the blows of the bit breaker 8 via provided in the faceplate 10 box 17 (2), through which also is the cleaning of destroyed rock.

To hold the removable faceplate 10 from tipping over in the end of the working cycle can also be used temporarily mount faceplate with telescopically extend metal pipes 18 (7) boards and pins. Boards laid close to the faceplate 10 for telescopically extend the metallic tubes 18, which are mounted in four or five rows of metal pins that are inserted into pre-drilled through the window 17 of the faceplate at the bottom of the bore-holes. The ends of the metal pipe 18 is slid into the wells developed in the sides of the excavation.

The complex is as follows (Fig.3-7). The grip 6 of the rotary lever 5 belcolade fix hammer 8 (figure 3). Using a pen is a mix of 13 blogocracy move on the width of the ring is finished (width tubing) and the blows of the chisel (peaks) breaker 8 produce preliminary weakening slaughter provided for through the window 17 in plate 10 (Fig 3). Next disconnect breaker 8 of the pivot arm 5 and the bracket 9 is fixed to the faceplate 10 on the rotary lever 5 (figure 4). After fixing faceplate 10 on the rotary lever 5 retractable stoppers 15 of the hydraulic cylinders 16 that holds the faceplate 10 from tipping over, return to the starting position. Include the actuator 12 of rotation of the pivot arm 5 and the faceplate 10 with the attached cutters 11, carry out the destruction of the breed, slaughter, and destruction of rock perform rotating movements of the pivot arm when rotated 180° the original one, then the other side. While the destruction of the species is carried out simultaneously with the retention of the roof over the whole cross section generation console 14 rigidly mounted on a removable plate 10. As the mining face of the faceplate 10 is pushed into the bottom output of the feed force of belcolade, a move which is performed by the movement mechanism 13. After completion of the face (figure 5) complex on the width of the ring is finished (width tubing) the faceplate 10 is disconnected from the pivot arm 5 belcolade put forward the stoppers 15 of the cylinders 16 of the faceplate 10, and the rotary lever 5 by means installed on it capture 6 attach the tubing 7 (6) for fastening a goaf. After installation of the tubing 7 across the section to develop zahvatu the pivot arm 5 is fixed hammer 8 (figure 3). Then the cycle repeats. At the end of each cycle a temporary holding table 10 from tipping over in addition to retractable stoppers 15 of the cylinders 16 of the faceplate 10, also can be carried out using telescopically extend metal pipes 18 (7) boards and pins.

The use of more simple construction of the complex for the workings in moderately and weakly resistant rocks will reduce the time and the volume on the pre-fixing and solve problems effectively excavations in moderately and weakly resistant rocks with higher performance.

Complex for the workings in moderately and weakly resistant rocks containing the working body in the form of a removable faceplate with blades across its surface, the protective sheath, the mechanism of movement of the working body and blogocracy, characterized in that the protective sheath is made in the form of a console, is rigidly fixed with the opportunity to hold the roof, the sides and the bottom hole on the faceplate, which is made with Windows for pre-weakening slaughtering and cleaning of destroyed rock has two retaining its cylinders with pull brakes and fixed to the rotary lever mounted on a frame of belcolade associated with the mechanism of movement, and one of the ends of the pivot arm is grip on the tubing I, made with the possibility of replacing it with a hammer.



 

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