JP2581167B2 - Segment perfect circle holding device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for holding a segment of an underground passage in a circular shape, which is vertically arranged in at least two stages.

[Prior art] There are various types of conventional single-hole shield excavators, such as earth pressure shields, mud pressurized shields, hand digging, semi-mechanical digging, and mechanical digging shields, all of which are newly assembled. The fresh segment is deformed flat by the earth pressure until the surrounding ground is solidified by the ground solidifying agent.

If the roundness of a segment is lacking, various problems occur, such as the inability to assemble the next segment and obtaining a calculated strength.

Therefore, the conventional shield machine has a perfect circle holding device a at the rear as shown in FIGS. 5 and 6, and an arc-shaped support member at the top and bottom of the newly assembled segment b.
The segments b and c are brought into contact with each other, and are pressed in the expanding direction by the perfect circular holding jacks e and f arranged between the support members c and d, thereby maintaining the perfect circle of the segment b until the surrounding ground is solidified.

[Problems to be Solved by the Invention] However, in recent years there has been a remarkable spread of subways in cities, but since subways etc. infringe underground rights and need to be compensated on private land, it is necessary to pass under public roads. Is normal. If a subway with multiple tracks runs in parallel, a width of about 7 m on each side and a total of about 7 m in the middle is required, so a total width of about 21 m is required.

However, in this case, the route of the subway is critically influenced by the presence or absence of a wide road.

Then, they came up with the idea of arranging the single holes in the vertical direction.
It is an object of the present invention to maintain the roundness of upper and lower segments when excavating a plurality of tunnels in a vertical direction.

Means for Solving the Problems According to the present invention, a discontinuous annularly assembled segment is vertically arranged so as to be in contact with a discontinuous portion, a cross beam is passed over the discontinuous portion, and a support member having an arcuate curved surface on the outside. And a flat support member are connected by at least a pair of telescopic rods, and a perfect circular holding unit in which a perfect circular holding actuator is attached to each of the telescopic rods is provided in each of the upper and lower segments. A perfect circle for a segment, wherein said flat support members are movably provided in the excavating direction so as to be able to abut against the upper and lower surfaces of said cross beam, respectively, and said circular actuators are connected in parallel. It concerns the holding device.

[Operation] By arranging the upper and lower perfect circle holding units in the upper and lower discontinuous annular segments respectively and driving the respective true circular holding actuators in parallel, the support member having the arc-shaped curved surface of each of the upper and lower units is moved to the upper and lower segments. , And the plate-like support members of the upper and lower units abut the upper and lower surfaces of the cross beam, respectively, and the perfect circle of the segment is held by all the support members. The cross beam between the flat support members receives only a compressive force, and hardly receives a deformation stress.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 and FIG. 2 show an embodiment of the present invention, in which two shield excavators are vertically arranged to assemble segments 1 and 2 on the inner peripheral wall of a hole having a gourd-shaped cross section.
Each of the segments 1 and 2 has a shape in which a discontinuous annular member is connected by a discontinuous portion.
And divided into an upper hole 5 and a lower hole 6.

The perfect circle holding units 7, 8 are arranged in the holes 5, 6, respectively.
The perfect circular holding units 7 and 8 include a support member 9 having an arcuate curved surface on the outside that can be in close contact with the curved surfaces of the segments 1 and 2, and a flat support member 10 that can be in close contact with the upper or lower surface of the cross beam 3.
Are connected at both ends through a spherical shaft 13 and a spherical seat 14 by a pair of parallel telescopic rods 11 and 12, respectively. Hydraulic jack 19, between brackets 17, 18 provided on cylinder portion 15 and rod 16 of telescopic rods 11, 12, respectively.
The telescopic rods 11 and 12 can be expanded and contracted by attaching 20. Further, the hydraulic jacks 19, 20, 21 and 22 of the upper and lower perfect circle holding units 7 and 8 are connected as usual so that hydraulic pressure can be supplied from the hydraulic pump 23.

In the figure, reference numeral 24 denotes a cushioning material such as a rubber plate provided on the contact surface of the flat support member 10 with the cross beam 3, 25 denotes a movable deck provided at the rear of the shield machine, and 26 denotes a telescopic rod 11, 12. 3 shows a hanging bracket provided on the side.

Because it was configured as described above, after excavating with the upper and lower shield excavator or the upper and lower integrated shield excavator and assembling the segments 1 and 2 so that the cross-sectional shape becomes a gourd shape, the ground solidifying agent was applied to the outer ground When the hydraulic oil is supplied to the cylinders of the hydraulic jacks 19, 20, 21 and 22 by the hydraulic pump 23, the rods of the hydraulic jacks 19, 20, 21 and 22 project, and each telescopic jack expands and contracts. The rods 11, 12, 27, 28 are extended.

Accordingly, the support member 9 of the upper perfect circle holding unit 7 abuts on the upper apex of the upper segment 1 and the flat support member 10 abuts on the upper surface of the cross beam 3. Similarly, the support member 9 of the lower perfect circle holding unit 8 contacts the lower apex of the lower segment 2 and the flat support member 10
Abuts the lower surface of.

At this time, if any of the telescopic rods 11, 12, 27, and 28 precedes, the hydraulic jacks 19, 20, 21, and 22 are connected in parallel. When the member comes into contact with the segments 1 and 2 or the cross beam 3, the extension is temporarily stopped, and only the other telescopic rods extend and catch up. Accordingly, no biasing force is applied to the upper and lower segments 1 and 2 and the cross beam 3, and a perfect circular holding force is evenly applied.

Pressure is applied to the cross beam 3 from the upper and lower surfaces, but the pressure from the upper and lower surfaces is substantially equal because the hydraulic jacks 19, 20, 21, and 22 are connected in parallel, and only the compressive force acts on the cross beam 3. I do. Therefore, little force is applied to the bolt 4 for fixing the cross beam 3, and a small bolt is sufficient for strength.

In this way, the roundness of the upper and lower segments 1 and 2 is held by the respective roundness holding units 7 and 8, and after the outer ground is solidified, the rods of the hydraulic jacks 19, 20, 21 and 22 are pulled in. Thereby, each telescopic rod 11, 12, 27, 28 is shortened. First, the rod 16 and the support member 9 of the unit 7 on the upper side are lowered, and the suspending bracket 26 rides on the movable deck 25,
Next, the cylinder portion 15 and the plate-like support member 10 are lifted up and moved forward by one stroke to the newly assembled next segment portion while being supported by the movable deck 25 as a whole. The lower unit 8 is similarly moved forward by one stroke.

The device for holding a perfect circle of a segment according to the present invention is not limited to the above-described embodiment, and the connecting structure between the telescopic rod and the support member is formed by connecting the brackets 29 and 30 and the pin 31 shown in FIG. The structure may be a direct connection fixed structure shown in FIG. 4, a hydraulic cylinder or the like may be used as a perfect circular holding actuator, and not only two vertical stages but also three or more stages may be arranged. It goes without saying that various changes can be made without departing from the spirit of the invention.

[Effects of the Invention] As described above, according to the device for holding a perfect circle of the segment of the present invention, the perfect circular holding unit is provided on the upper and lower sides, and the perfect circular holding is driven in parallel via the cross beam passing to the middle part of the segment. Since the actuator maintains a perfect circle,
The roundness of the vertically arranged segments can be maintained, and the pressure from the upper and lower segments can be offset by the cross beams, so that the cross beams and the support structure of the cross beams are not increased, thereby reducing construction costs. Various excellent effects can be achieved, such as possible.

[Brief description of the drawings]

FIG. 1 is an explanatory view of one embodiment of the present invention, FIG. 2 is a schematic explanatory view of a drive circuit of a hydraulic jack in FIG. 1, and FIG. 3 is another example of a support structure of a support member in FIG. Diagram,
FIG. 4 is a view showing still another example of the support structure of the support member in FIG. 1, FIG. 5 is a view showing an example of a shield machine,
FIG. 6 is a view showing a state in which the segment is held in a perfect circle by the perfect circle holding device shown in FIG. 1, 2 is a segment, 3 is a cross beam, 4 is a bolt, 7, 8 is a perfect circular holding unit, 9, 10 is a support member, 11, 12, 27, 28 are telescopic rods, 15 is a cylinder, 16 Are rods, 19, 20, 21, 22
Indicates a hydraulic jack, 25 indicates a movable deck, and 26 indicates a suspension bracket.

Claims (1)

(57) [Claims] 1. A discontinuous annularly assembled segment is vertically arranged so as to be in contact with a discontinuous portion, a cross beam is passed over the discontinuous portion, and a supporting member having an arc-shaped curved surface on the outside and a flat supporting member are provided. Connected by at least a pair of telescopic rods,
A perfect circle holding unit having a perfect circle holding actuator attached to each of the telescopic rods is provided in each of the upper and lower segments so that an arc-shaped curved surface can be brought into contact with each segment, and each flat support member is connected to the upper and lower surfaces of the cross beam. A perfect circular holding device for a segment, wherein each of the perfect circular holding actuators is connected in parallel so as to be movable in the excavation direction so as to be able to abut against the segment.