Mechanised shield

 

The invention relates to tunnelling, more precisely, to construct using tunneling shields tunnels large extent under the sea or river bottom 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 the hoses. 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. 1 C.p. f-crystals. 6 Il.

Known mechanized shield with hydraulic prigruzkoj with cassono and the normal zone and consisting of the cutting body, the faceplate excavation, shell shield for safe operations, support ring with the mechanisms of movement of the main shaft with hydraulic motors, bottom walls, jacks lapping the gateway apparatus, the sealing device to prevent the ingress of soil into the tunnel from the face and other mechanisms /1/.

The disadvantages of this device is that when developing a soil cutter body with the content in the rock large fractions of gravel and boulders last broke down, needed replacement, and under certain hydrostatic pressure was the collapse of the face, and also had a leak thixotropic slurry into the soil and groundwater inflow to the pit, which led to stoppage of work and extra work and costs. In addition, when the length of the tunnel more than 1 km has created the need to overload the soil in wagons, construction of additional trunks and caisson. In some cases, has created the need for chemical fixation of the soil, isotropy and slurry additives, the use of additional equipment and materials associated with emergency.

The objective of the invention is to improve the functionality and efficiency of the shield.

The problem is solved by the fact that mechanized shield composed of an element of destruction rocks, shell shield for safe operations and placement mechanisms of movement imposed on the supporting ring, the sealing device to prevent rocks in the tunnel contains a blank separating the work area from the face wall, the perimeter of which are mounted the hose element and the destruction of the breed 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.

In another embodiment, the mechanized shield diameter tapered faceplate greater than the diameter of shita, and the axis of the shield is shifted by the difference of the diameters.

Due to the conical design of the faceplate, the use of water supplied under pressure, and the deaf partition changes the technology works, no hydraulicpowered. Reversing the rotation of the faceplate eliminates jamming of the faceplate and its breakdown. Through pipes to the water under pressure around the perimeter of the cutting part of the faceplate, the eroded soil with silt and thanks lobed cells during the rotation of the faceplate rises to the pivot part of the shield, creating conditions for the destruction of the top soil layer and, accordingly, the possibility of moving shield. Through education in the pit cutback ground it spreads over the tunnel and water.

When dense solidity of the ground a large extent used the shield with offset axis of the shield to pivot part, with table diameter greater than the diameter of the shield on the offset value to create a downhole space.

The proposed device is illustrated graphics.

In Fig.1 shows a longitudinal section of the shield. In Fig.2 is a cross section a-a of Fig.3 - cross section b-b of Fig.4 is a variant of the cross-section of the shield with offset axis, Fig.5 is a cross section C-C of Fig.6 is a cross section D-D.

Mechanised shield consists of a tapered faceplate 1, which is the cutting body of the shield, with a flow cell 2 and blades 3. The hose 4 is placed around the perimeter of the deaf perehara the AET gear 7, rack and pinion jacks 8 performing reverse rotation, the main shaft 9, jacks feeder 10 of the faceplate 1, the support ring of the shield 11, the water pipeline 12, legs 13 to supply faceplate 1, jacks Prodigy shield 14, the enclosure 15. The shield also comprises a sealing device 16, which prevents the ingress of soil into the tunnel and block covering the lining of the tunnel 17.

The device operates as follows. To start work, including the faceplate 1 and the water pipeline 12. Water under pressure from the hoses 4 blurs and part of the shield, freeing space for the promotion of the shield. Jacks feeder 10 feeds the faceplate 1 forward and create conditions for Prodigy shield jacks 14. Given the shallow slope of the tunnel in the soil under the influence of the sea water pressure on the upper arched portion of the shield, the arch collapses, forming a pit cutback primer and it allows for reversing the rotation of the faceplate 1 to avoid jamming and to promote the shield jacks Prodigy 14 forward on the face. Liquefied soil, mixed with mud, spread and compacted over the tunnel space. The sealing device 16, as the cuff pressure together with the ground on the outside of the tubbing or any other lining tunnel is ti use the shield with offset axis of the shield to pivot part.

Sources of information 1. RF patent 2151296, CL E 21 D 9/08, publ. 20.06.2000.

Claims

1. Mechanised shield composed of an element of destruction rocks, shell shield for safe operations and placement mechanisms of movement imposed on the supporting ring, the sealing device to prevent rocks in the tunnel, characterized in that it contains a blank separating the work area from the face wall, the perimeter of which are mounted the hose element and the destruction of the breed made in the form of tapered faceplate reversing the rotation elements of the cutting blade and cells.

2. Mechanised shield under item 1, characterized in that the diameter of the tapered faceplate greater than the diameter of the shield, and the axis of the shield is shifted by the difference of the diameters.

 

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