Tunnel shield and seal assembly

 

(57) Abstract:

Usage: the invention relates to underground construction, namely the tunneling shields with the rotary blade section, and can be used in the construction of tunnels with small radii of curvature. The inventive tunnel shield consists of knife sections, casing, panel, hydraulic cylinders installed in the support rings knife section and the housing, and a sealing unit between the blade section and the housing. Panel hydraulic cylinders pivotally mounted on the blade section through the swivel bearing and freely installed in the bearing ring knife section, the front support ring and the rear support ring body shield. Panel cylinders rigidly attached to the front support ring body shield and freely installed in the bearing ring knife section. This will allow you to use shield of the cylinders as to move the shield, and to rotate the knife section. This eliminates the twisting and lateral displacement of the blade section or housing of the shield relative to each other. Seal Assembly between the blade section and the body is made in the form of a flexible sheet of elastic rings and elastic strip. Gabalawy groove housing a flexible sheet attached to the frame via an elastic gasket. The proposed sealing unit to allow for lateral displacement of the knife sections or housings relative to each other during rotation of the knife sections and to exclude the possibility of formation of unconsolidated clearances between the blade section and the body of the shield. 2 s and 5 C.p. f-crystals, 6 ill.

The invention relates to underground construction, namely the tunneling shields with the rotary blade section, and can be used in the construction of tunnels with small radii of curvature.

Known tunneling step, comprising a housing, a blade section mounted to rotate relative to the housing by means of hydraulic rams its rotation, plate cylinders and seal Assembly between the blade section and the housing. (Japan's bid N 61-4480, published. 1986).

The disadvantage of this shield is that to rotate the knife sections are additional cylinders, which complicate the design of the shield and the management of its movement.

In addition, the seal Assembly is made in the form of an elastic ring placed in the annular gap between the blade section and the body does not compensate for lateral displacement of the blade section as it is rotated to consider is the most closest to the technical essence and the achieved result is a tunneling shield, includes case with front and rear support rings, knife section with a support ring mounted to rotate relative to the housing, panel hydraulic cylinders installed in the support rings knife section and the housing, and a sealing unit between the blade section and the housing. (Japan's bid N 3-43435, CL E 21 D 9/06, published. 1991).

Knife section and the body of the specified shield has overlap each other and at the junction have a spherical surface. When this seal Assembly between the blade section and the casing is placed in the annular groove of the knife sections on the spherical surface of the body, to compensate for lateral displacement of the blade section as it is rotated relative to the body and increases the reliability of the sealing unit.

However, it requires precise fabrication of the spherical surfaces of the blade section and the casing installed lap.

Moreover, the shield does not prevent twisting of the knife sections or housings relative to each other, and the use of advanced hydraulic cylinder to rotate the knife section complicates the design of the shield and his service.

The objective of the invention is the ability and Uchenie transverse displacements and torsion of the blade section and the body of the shield relative to each other.

The problem is solved in that in the tunneling shield portion of the shield cylinders pivoted on knife sections and freely installed in the support rings knife section and the housing, and the other part of the shield cylinder is rigidly fixed to the casing and freely installed in the bearing ring knife section.

Part of the panel of the cylinders can be made with shanks, each shank hinged by means of hinge bearing on the blade section and freely mounted in the bearing ring knife section and the front support ring body shield. The other part of the shield cylinder may have a shank with thread, with each shank with thread rigidly attached to the front support ring body shield by means of the nut sleeve and washer, nut-sleeve freely mounted in the bearing ring blade section, and a washer placed between the body panel of the hydraulic cylinder and the front support ring body shield.

In this embodiment, the fastening of the shield cylinder liner panel hydraulic cylinder pivotally mounted on the blade section, the base has a spherical bearing surface which is located at a distance from the front of the th on the blade section, prior to its move. The front support ring body shield has a side body panel of the hydraulic cylinder spherical groove radius equal to the radius of the sphere of the spherical bearing surface of the liner panel hydraulic cylinder pivotally mounted on the blade section. Each nut-sleeve provided with a tapered side blade sections, and the angle of the cone nut bushing is not less than the angle of rotation of the knife section.

In addition, the sealing unit is made in the form of a flexible sheet of elastic rings and elastic strip, flexible sheet placed in the annular groove of the knife sections with gaps that have elastic ring, and the annular groove of the housing shield flexible sheet attached to the frame via an elastic strip.

To solve this task required the whole set of essential features.

The fastening part of the frame cylinders through a swivel bearing on the blade section will provide rotation of the knife section in the desired direction. Rigid fastening another part of the shield cylinder body shield will provide movement of the body and knife section in the longitudinal direction. Free accommodation PEIE other part of the shield cylinder in the bearing ring knife section will not hinder the rotation of the knife section.

In addition, rigid fastening the other side panel of the cylinders to the front support ring body shield prevents lateral displacement and twisting of the knife sections and housing relative to each other.

The proposed layout of the sealing unit excludes the formation neoplatonically clearances between the blade section and the housing due to the possibility of flexible sheet that is installed in the annular groove of the knife section through the elastic ring and fixed in the annular groove of the housing of the shield through the elastic strip to bend when turning the knife sections and constantly interact with blade section and the body of the shield.

In Fig. 1 shows a tunneling shield with swivel blade section; Fig. 2 is a view As in Fig. 1; Fig. 3 section b-B in Fig. 2, node a hinged fastening panel of the hydraulic cylinder via a swivel bearing for the knife section; Fig. 4 section b-b In Fig. 2, node a rigid fastening of the panel of the hydraulic cylinder on the body of the shield; Fig. place 5 G of Fig. 3, seal Assembly of Fig. 6 section D-D in Fig. 3.

Tunnel shield includes knife section 1, building 2, plate cylinders 3 and 4 mounted in the support rings knife section is the possibility of rotation by the angle alpha relative to the housing 2 via the shield of the cylinders 3.

Each shield cylinder 3 is made with a shank 5, which is free (with a gap) is placed in the bearing ring 6 knife section 1 and the front support ring 7 of the housing 2, the housing panel of the hydraulic cylinder 3 is freely placed in the rear support ring 8 of the housing 2 of the shield.

The shank 5 pivoted on knife sections 1 through the ball bearing 9 mounted on the shaft 10, which is placed between the ribs of the supporting ring 6 knife section 1. The shank 5 has in the basis of spherical bearing surface with a radius of the sphere r1and the front support ring 7 of the housing 2 of the shield from the housing panel of the hydraulic cylinder 3 has a spherical recess of radius r2equal to the radius r1sphere spherical bearing surface of the shank 5.

Each shield cylinder 4 has a shank 11 with a thread, which is rigidly attached to the front support ring 7 of the housing 2 of the shield by means of the nut sleeve 12 and washer 13. Nut-the nut 12 is tapered from the side of the knife section 1 with a cone angle of not less than angle a blade section 1. Nut-the nut 12 is freely mounted in the bearing ring 6 knife section 1, and the washer 13 is placed between the body panel of the hydraulic cylinder 4 and the front pillars is it thus, that the spherical bearing surface of its shank 5 is located at a distance from the front support ring 7 of the housing 2 shield not less than the height of the washer 13 in the panel position of the hydraulic cylinder 3 to the beginning of its movement, so that the shield rods of the cylinders 3 and 4, respiradone when the shield advancing built in ring tunnel lining, would lie in one plane.

The support ring 6 knife section 1 is made from the side of the housing 2 with the bevel. The bevel angle g is made not less than angle a of rotation of the knife section 1 relative to the housing 2.

Seal Assembly between the blade section 1 and the housing 2 is installed with the possibility of compensation of the transverse displacements of the knife section 1 as it is rotated relative to the housing 2. For this purpose it is made in the form of a flexible sheet 14, the elastic ring 15 and the elastic strip 16.

The flexible sheet 14 is placed one end in the annular groove 17 of the knife sections 1 and at the other end in the annular groove 18 of the housing 2 of the shield.

In the annular groove 17 of the knife section 1 flexible sheet 14 is placed with a gap relative to the blade section 1, which is installed with an elastic ring 15. When this elastic ring 15 is placed in the grooves of the knife sections 1 and cover 19, and the cover body 2 and attached via elastic strip 16 and the cover 20.

The length of the flexible sheet 14 is greater than the moving blade section 1 relative to the housing 2, to prevent loss of the elastic ring 15. The flexible sheet 14 is made, for example, from spring steel.

Tunnel shield works as follows.

Moving the tunneling shield on the slaughter carried out by the extension rod shield cylinders 3 and 4, razbirayuschihsya built in ring tunnel lining, and the body panel 4 cylinders rigidly mounted on the front support ring 7 of the housing 2 by means of nuts-sleeves 12 and washers 13, act through the front support ring 7 of the housing 2 on the blade section 1. Body shield cylinder 3 through the shank 5 also affect knife section 1, resulting in the shield is pushed onto the bottom.

To change the direction of penetration of the knife section 1 turn in the desired direction. For this panel the cylinders 4 and part of the shield cylinder 3 is disconnected and continue the extension of the rods of the other group shield cylinders 3, required to rotate the blade section 1. In this case shield cylinders 3 of this group freely placed in the support rings knife sections 1 and block 2 and the dependence from the chosen direction.

After moving the panel housings of the cylinders 3 by an amount equal to the height of the washers 13 shield cylinders 4, which corresponds to the rotation of the knife section 1 at the angle alpha, continue to move the shield in a selected direction, including the work of the panel of the cylinders 4 and another group called the cylinders 3.

When turning the knife section 1 nut sleeve 12, provided with a tapered and placed freely in the bearing ring 6 knife section 1, and the support ring 6, is made with a bevel angle g from the side of the housing 2 and the spherical recess of radius r2equal to the radius r1sphere spherical bearing surface of the shank 5, do not hinder the rotation of the knife section 1 on the angle a.

The proposed option of fixing the panel housings of the cylinders 4 having the shanks 11 are threaded with nuts-sleeves 12 and spacers 13 on the front support ring 7 of the housing 2 shield prevents twisting and lateral displacement of the knife sections 1 and block 2 of the shield relative to each other.

When turning the knife section 1 flexible sheet 14 cooperates with the knife section 1 through the elastic ring 15 and the housing 2 through the elastic strip 16, eliminating the possibility of formation of newplot arenim and rear support rings, knife section with a support ring mounted to rotate relative to the housing, panel hydraulic cylinders installed in the support rings of the knife section and the housing, and a sealing unit between the blade section and the housing, wherein the shield part of the cylinders pivoted on knife sections and freely installed in the support rings knife section and the housing, and the other part of the shield cylinder is rigidly fixed to the casing and freely installed in the bearing ring knife section.

2. Shield under item 1, characterized in that the shield part of the cylinders is made with shanks, each shank hinged by means of hinge bearing on the blade sections and placed freely in the bearing ring knife section and the front support ring body shield.

3. Shield under item 1, characterized in that the other part of the shield cylinder has a shank with thread, with each shank with thread rigidly attached to the front support ring body shield by means of the nut sleeve and washer, nut-sleeve freely mounted in the bearing ring blade section, and a washer placed between the body panel of the hydraulic cylinder and the front support ring to which is fixed on the blade section, the base has a spherical bearing surface which is located at a distance from the front support ring body shield at least the height of the washer in position panel hydraulic cylinder pivotally mounted on the blade section, prior to its move.

5. The shield on the PP.1 to 4, characterized in that the front support ring body shield has a side body panel of the hydraulic cylinder spherical groove radius equal to the radius of the sphere of the spherical bearing surface of the liner panel hydraulic cylinder pivotally mounted on the blade section.

6. The shield on the PP.1 and 3, characterized in that each nut is a sleeve provided with a tapered side blade sections, and the angle of the cone nut bushing is not less than the angle of rotation of the knife section.

7. O the node containing the sealing element mounted in the annular grooves of the knife section and the body of the shield with the possibility of compensation of the transverse displacements of the blade section as it is rotated, characterized in that the sealing element is designed in the form of a flexible sheet of elastic rings and elastic strip, flexible sheet placed in the annular groove of the knife sections with gaps that have elastic is

 

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