SU1671868A1 - Method of determining the positions of a tunnel shield set in curved sections of roadway - Google Patents

Abstract

This invention relates to the excavation of shafts. The goal is to increase the reliability of determining the position of the tunnel shield complex during the penetration process for each step of the shield movement. Prior to penetration, the design points of the location of the center of the shield, which represent the intersection points of the radius of the design curve of the tunnel axis with the direction of penetration, are predetermined in advance. Find the angle of rotation of the center of the shield for each step of the shifter and in accordance with it determine the corresponding coordinates of two points located on opposite sides relative to the design curve of the axis of the tunnel. One of the points is the intersection point of the shield knife with the longitudinal radius of the design curve of the axis of the tunnel passing through the subsequent design center of the shield and coinciding with the direction of the front measuring rod (MR). The other point is the intersection point of the shield tail with the radius of the design axis of the tunnel, passing through the previous center of the shield and coinciding with the direction of the rear MR, respectively. When advancing the tunnel shield complex along the tunnel, the design removal of the Knife and Tail points of the shield from the tunnel axis is compared with the actual distance determined by the front and rear horizontal MR at the corresponding points. At the same time, horizontal MRs are located on the shield complex at an angle to each other equal to the central angle, and with the possibility of moving them along the radii at which the axes are located. 1 il.

Description

This invention relates to the excavation of shafts.

The aim of the invention is to improve the reliability of determining the position of the tunnel shield complex during the penetration process for each step of the shield movement.

The drawing shows schematically the section of the curve of the route of the tunnel being constructed, a plan view.

This method is carried out as follows.

Before penetrating, the shield complex is mounted on a shield chamber located in a circular curve with the radius of the design axis of the tunnel R, passing through the center C. In the middle of the shield shell, a metal table for the instrument with the center NI is welded to the end

they tighten spatial polygonometry in terms of basic underground accuracy. The last base mark is denoted by d. The measurement of the length of the section Ci-III i is directly performed and the angle is determined at Ci /. Then, all the parameters of the triangle CiLUi are calculated, which are indicated as follows: CiLUi ach, UCi 81, Tshg E, and the coordinates of the points IMhsch and Usch are determined. Having obtained the value of E, they find the difference E-R and obtain a new design point P0 (the sequence number of the shield advance). Then the triangle CiLUin0 is solved and the final design parameters YO.XO are calculated, n. So./30 and Pk P0.

After that, along the design curve of the tunnel axis from the point P0, they lay the distances equal to the step of full advancement of the shield P1, P2, PzPk. From the center C of the design curve of the axis of the tunnel, lead through points P1, P2. PzPk radii. The central angle y is determined by the formula

siny

J r

ABOUT)

where I is the length of the shield polygon line;

R is the radius of the curve of the design axis of the tunnel.

After that, the angle of rotation of the center of the shield is determined for each step of the advancement / using the formula

180 ° 00 00 - arc siny.

(2)

Then, the coordinates of points P1, P2PzPk are calculated, the control of which is carried out by adjoining the stroke to the center of the curve using the formula

Y4 sln () R + YK; Xu cos (OK + / 3) -R + Hk.

(3)

Next, the coordinates in the coordinates and their distribution are determined. The magnitude of the skew depends on the accuracy of determining the center angle y. Appearances in coordinates appear as a result of the adjoining of the stroke to the center of a circular curve and are scattered with the opposite sign directly to the coordinates of the points.

Uv heading polygonometry and having project coordinates of points

P1, P2, Pzpk center of the shield for each advance, determine the position of the longitudinal axis of the shield relative to the tunnel route, i.e. determine the position of the knife and

tail shield. For this purpose, from the point of spatial polygonometry, Ci is carried out directly, passing through point P1 before its transfer with the subsequent radius,

passing through point P2 at point Hi (knife position, advance No. 1). Since this route, passing through point P-i, intersects the previous radius, we get the intersection point with the given radius Xi (tail position, advance No. 1). Similarly, from the point of spatial polygonometry, Ci is passed directly through all the points

P- | .P2, PzPk centers of the shield at each step

advances. On each straight line they denote

5 points Hi and Xi, denoting the positions of the knife and tail of the shield for each step of the advance. Since the points of the knife shield Hi and tail shield X | are on the same straight line with the points of the center of the shield, then as a result of

0 inverse geodesic tasks receive directional angles Hi-Hi and PGH |

The length of each section П | -Н (or П | -Х | is equal to the step of advancement of the shield, for example 1 m. Since the extension of the line

5 П | -Н | with respect to the side of the shield polygonometry, is no more than 2 mm, and the P | -X | and even less, this difference to find the coordinates Hi and X is not practical, therefore, neglecting this difference, the coordinates of the knife points Hi (Hi, H2, NzNk) and tail are calculated.

Xi (Xi, X2, Xs Xk) of the shield, i.e.

the design distance of these points from the axis of the tunnel along the direction of the corresponding

5 radius of the design curve of the axis of the tunnel for each step of advancement.

With the advancement of the mining shield complex along the tunnel route, the design removal of knife-N points and tail-Xi

The shield from the axis of the tunnel is compared with the actual one, determined by the front and rear horizontal measuring rails at the corresponding points. At the same time, horizontal measuring slats are placed on the shield complex at an angle to each other, equal to the central angle y, and with the possibility of moving them along the radii on which they are located. This makes it possible to increase the length of passage of the shield panel

0 complex from one platform.

As a result of a comparison of the design removal of the points of the knife and tail of the shield with respect to the design axis of the tunnel with the actual correction of the axis of the orifice shield complex.

When driving along a curved path when constructing a tunnel with the proposed method, the reliability of controlling the position of the head of the R plan is significantly improved due to the fact that

Theodolite pipes are always directed to the design point of the center of the shield, which makes it possible to control even the designative rotation of the axis of the tunnel boring complex, having a predetermined shield angle. Already before the next advancement, it is always known in advance what kind of jack must be turned on to issue a command.

Due to the presence of pre-calculated design coordinates of the knife and the tail of the shield at each shield angle of the corresponding step of advancement of the mining shield panel it is easy to control and, if necessary, adjust the actual position of the shield panel in the plan.

In addition, this method of controlling the advancement of the shield panel complex along the curved path allows the trip length to be increased from one platform three times, since all points of spatial polygonometry are predetermined, which makes it possible to shift the center of the shield outward from the design axis of the tunnel distance This offset, as a constant value, adds to the existing design calculations the coordinates of all points (the center of the shield, the knife and the tail of the shield). In accordance with this, the number of disassemblies and installations of the spacecraft is reduced, and, consequently, labor costs and the cost of tunneling are reduced.

Claims (1)

Claims of Invention A method for determining the position of a tunnel shield complex as it passes along curved sections of a route. consisting in transferring in nature the material points specified by the coordinates, including setting the working direction indicator to the working position along a predetermined direct at an arbitrarily selected point in space, the rectangular coordinates of which determine the previously selected conditional coordinate system, and setting in the path this straight horizontal measuring racks, which control the location of the material points in accordance with the given coordinates in the same coordinate system, characterized in that Accelerating the reliability of determining the position of the shield in the plan during the penetration process for each step of the shield movement, prior to the penetration, in plan are defined the design points of the center of the shield, which are the intersection points of the radius of the design curve of the tunnel axis from the forward direction of penetration, find the angle of rotation of the center of the shield for each step of the movement and in according to it, the corresponding coordinates of two points located on opposite sides of the design curve of the tunnel axis are determined, one of which is the intersection point of the shield knife with the extension of the radius of the design curve of the tunnel axis passing through the subsequent design center of the shield and coinciding with the direction of the front dimensional reiki and a friend is the point of intersection of the shield tail with the radius of the design axis of the tunnel, passing through the previous center of the shield and coinciding with the direction of the rear measuring rod.