JPH0932492A - Segment and conduit comprising the segment - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a segment capable of continuously propelling a shield machine. SOLUTION: Front and rear end faces c and d corresponding to the longitudinal direction of the pipe mound are formed by spiral curved surfaces parallel to each other, and end faces e and f corresponding to the circumferential direction of the pipe ditch pass through a central axis n of the pipe ditch. It is composed of a plane located on the plane.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe conduit segment and a pipe conduit formed by spirally assembling the segment.

[0002]

2. Description of the Related Art The excavation cycle in the shield method is
It consists of four processes: excavation of the ground, intake of excavated soil, promotion of shield machine and segment assembly.

[0003]

Among these, the segment assembling is performed because the shield machine is propelled in a temporarily stopped state, and therefore the shield machine is intermittently propelled. The propulsion speed of the machine slows down. The present invention has been made to solve such a problem, and an object of the present invention is to provide a segment capable of continuously propelling a shield machine and a pipe containing the segment. It is in.

[0004]

[Means for Solving the Problems] That is, according to the segment of the present invention, the front and rear end faces corresponding to the longitudinal direction of the pipe are composed of spiral curved surfaces parallel to each other, and the end faces corresponding to the circumferential direction of the pipe are the pipe culverts. It is composed of a plane located on a plane passing through the central axis of. On the other hand, the pipe of the present invention composed of the segments is composed of a spiral ring group that advances by a distance equal to the length in the front-rear direction of the segment every time one ring is assembled.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the segment L of the present invention has a curved plate shape, and the front and rear end faces c and d corresponding to the front-rear direction of a pipe m to be described later are spiral curved surfaces parallel to each other. End face e corresponding to the circumferential direction of the culvert m,
f is composed of a plane located on a plane passing through the central axis n of the pipe m. Further, g indicates the outer surface of the segment, and h indicates the inner surface of the segment.

FIG. 2 shows a state in which a pipe m is constructed by using the segment L divided into 8 per ring by a shield machine i having 16 shield jacks j. The assembling order of the segments L is performed from a position farthest from the shield jack i, in other words, a position where at least one of the two shield jacks is fully extended.

In FIGS. 2 and 3, the segment L43 is
Corresponding to this, since the shield jack j13 is fully extended, only the shield jacks j12 and j13 are contracted, and the pipe m
And a gap between the shield jacks j12 and j13,
The segment L43 is about to be assembled. When the assembly of the segment L43 is completed, the shield jacks j12 and j13 are extended, and the resulting force is applied to the segment L43 to share the propulsive force of the shield machine i.

Even while the segment L43 is assembled, the shield machine i continues to excavate. When the shield jacks j12 and j13 participate in the propulsion of the shield machine i, the shield jack j11 extends almost at the same time. In the cut state, the shield jacks j10 and j11 are contracted to make a space for the next segment (not shown).

Thereafter, the segments L are spirally assembled in the same procedure to complete the pipe m. In the present invention, in order to prevent the seams of the segments from being aligned, the segment 21
Is the minimum length, the length of the segment 29 is the maximum length, and the other segments, that is, the segments 22 to 2
The length of 8 is the same. Then, in adjacent rings, a small segment and a large segment are alternately used at only one place, respectively, and when two rings are assembled, they are designed to return to the same pattern.

When A is the rear lowermost point of the segment 21 and B is the rear lowermost point of the segment 29, the pitch of the spiral ring is equal to the length of the segment L in the front-rear direction.

[0011]

As described above, according to the present invention, the shield machine can be continuously propelled without stopping. Therefore, it becomes possible to construct an underground tunnel more efficiently than before, and the construction period can be shortened.

[Brief description of drawings]

FIG. 1 is a perspective view of a segment according to the present invention.

FIG. 2 is an explanatory view showing how segments are assembled in a spiral shape by a shield machine.

FIG. 3 is an explanatory view showing an assembly order of segments.

[Explanation of symbols]

 c, d end face corresponding to the longitudinal direction of the pipe e, f end face corresponding to the circumferential direction of the pipe m m pipe n n central axis of the pipe

Claims (2)

[Claims] 1. The front and rear end faces corresponding to the front-rear direction of the pipe are composed of spiral curved surfaces parallel to each other, and the end faces corresponding to the circumferential direction of the pipe are located on a plane passing through the central axis of the pipe. A segment consisting of. 2. A pipe comprising a group of spiral rings that advance by a distance equal to the length of the segment in the front-rear direction each time one ring is assembled.