JPS5923120Y2 - Segment roundness holding device - Google Patents

Description

[Detailed description of the invention] This invention is a segment perfect circle holding method that holds segments in a perfect circle from the shield machine side, which is used in the shield construction method when constructing underground railways, water supply and sewerage systems, cable burial ditches, public ditches, etc. It is related to the device.

Circumferentially divided segments made of steel, conchnaut, ductile, etc., used to semi-permanently support tunnels in soft ground excavated by shield machines, are used as connections between segments when assembled into a ring shape. This may cause misalignment or unevenness.

Furthermore, even after assembly, the segments assembled into perfect circles may be deformed due to their own weight, the earth pressure of the surrounding soft ground, and the water pressure load.

In this way, if there is a misalignment or difference in level at the segment connection part, or if the perfect circle is deformed, the accuracy of tunnel construction will decrease, ground loss will occur due to water leakage from the segment connection part, and the gap between the shield machine and the segment will decrease. Problems such as damage to the tail seal, which seals out soil and water from the surrounding soft ground, may occur.

In order to solve such problems, an example of a conventional device used to hold assembled segments in a perfect circle will be explained with reference to Figs. 1 and 2. This involves excavating into the mountains to the left in Figure 1.

Segments C assembled in a circle are already lined up behind the shield machine a, and the tail seal b attached to the tail end of the shield machine a seals between the shield machine a and the segment C. It is protected from soil and water from entering.

Furthermore, the segment L-d, which is currently being assembled, is attached to the front end of the segment C, which has already been assembled into a circular shape.

A rear workbench g that extends horizontally to the rear is attached to the center of the shield machine a, on which a segment holding device e is attached, and two supports I.
The arc-shaped support shoe h is pressed by the jack f against the inner surface of segment) C one ring before the segment) d to be assembled, thereby preventing steps or deformation from occurring.

However, in the conventional device shown in FIGS. 1 and 2, the segment holding device e is rigidly connected to the rear workbench g that is integrated with the shield machine a, so the shield machine cannot be held in the segment holding state. When propelling the segment (a), an excessive force is applied to the segment holding device (e) and the segments (c) and (d), causing the segment holding device (e) to fall over or the segment (c) to be moved.
, d may be damaged.

In addition, when a motion such as pitching, rolling, or yawing occurs in shield machine a, the same motion is transmitted to segment holding device e, making it impossible to hold segment C, or the steering response of shield machine a may be affected when holding a segment. There were drawbacks such as a decrease in

Further, other examples of conventional devices will be explained with reference to FIGS. 3 and 4, where a' is a shield machine, b' is a tail seal, and C'
is a segment that has already been assembled into a circular shape, d' is a segment that is currently being assembled, and a segment holding device e' is installed at the rear of shield machine a' in a state independent of shield machine a'. , the shield machine a' and the segment holding device e' are connected to the traction wire h.
’ are connected.

Arc-shaped support shoes i, i are attached to the upper and lower parts of the segment holding device e', respectively, and are adapted to press against the inner surface of the segment C' by the action of the support jacks f'.

As shown in Fig. 3, the lower support shoe i is attached with a sled g' to prevent falling, and when the shield machine a' is propelled, the support jack f' is retracted and the sled g' is stabilized. While maintaining balance, the shield machine a' is propelled by the traction wire h' and the segment I
- The holding device e' is being pulled.

In the conventional device shown in FIGS. 3 and 4, when the segment I/holding device e' is stationary, it is stabilized by the fall prevention sled g', but when it is moved, it is shielded by the traction wire h'. It will be drawn along with the propulsion of machine a.

For this reason, the followability of the segment holding device e' to the shield machine a' is poor, and when the segment holding device e' is pulled forward, the semen 1 to the holding device e' get caught in the connection part of the segment holding device and fall over. Therefore, it is necessary to clean dirt, foreign matter, etc. from the inner surface of the segment C', which has the disadvantage of reducing workability and workability.

The present invention eliminates the above-mentioned conventional drawbacks, is not affected by pitching, rolling, yawing, etc. of the shield machine, and smoothly follows the shield machine when moving forward. , a guide rail attached to the workbench in the front-rear direction (tunnel axis direction), a stay material located on both sides of the workbench that expands and contracts in the vertical direction, and a stay material attached to both the upper and lower ends of the stay material. an arc-shaped gripper shoe, one end of which is connected to one of the stay material or the workbench via a spherical joint, and the other end of which is pivotally connected to the other of the stay material or the workbench, and the stay material is moved along the guide rail. A front and rear sliding jack for movement, a balance jack having one end attached to the stay material and a shoe having the other end abutted against the side surface of the workbench, a bracket fixed to the stay material, and the bracket. When the gripper shoe is attached to the inner periphery of the ring-shaped segment, it floats from the guide rail, and when the gripper shoe is separated from the segment, it is placed on the guide rail. The object of the present invention is to provide a segment perfect circle holding device characterized by comprising a shoe as described above.

Next, an embodiment of the present invention will be described with reference to FIGS. 5 and 6.

In Fig. 5, 1 is a shield machine, 2 is a tail seal,
3 is a segment that has already been assembled into a circular shape.

The shield machine 1 is integrally formed with a vertical support 4, to which a rear workbench 5 is attached.

The rear workbench 5 is always supported horizontally by a support stay 6, and guide rails 7 are fixed to both sides of the upper surface in the front-back direction as shown in FIG.

As is clear from FIG. 6, stay members 8 are vertically positioned on both sides of the rear workbench 5.

The lower end of the stay member 8 is fitted into another stay member 9, and a gripper jack 10 is installed between the stay members 8 and 9, so that the stay members 8 and 9 can be expanded and contracted in the vertical direction. There is.

Arc-shaped gripper shoes 11 are attached to the upper end of the stay member 8 and the lower end of the stay member 9, respectively. When the stay members 8 and 9 contract, the gripper shoe 11 becomes separated from the segment 3.

The left half of Figure 6 is a sectional view taken along the line AA in Figure 5, and the stay material 8,
9 shows the extended state, and the right half of Fig. 6 shows the 5th
The sectional view taken along the line B-B in the figure shows the state in which the stay members 8 and 9 are contracted.

A laterally protruding bracket 12 is fixed to the stay member 8, and one end of a front and rear slide jack 14 (see FIG. 5) is connected to this via a pin 13.

The other end of the front and rear slide jack 14 is connected to a bracket 16 on the rear workbench 5 via a spherical joint 15.

The mounting positions of the pin 13 and the spherical joint 15 may be reversed from this embodiment.

One end of a balance jack 17 is further attached to the stay member 8 so that a shoe 18 at the other end of the balance jack 17 comes into contact with the side surface of the rear workbench 5.

Further, a shoe 19 is attached to the lower surface of the bracket 12, and when the stay members 8 and 9 contract, the shoe 19 comes into contact with the upper surface of the guide rail 7, and the stay members 8 and 9 are moved onto the guide rail 7 via the bracket 12. It is designed to be supported while hanging.

When the front and rear slide jacks 14 are operated in this state, the shoes 19 slide on the guide rails 17, and the stay members 8,
9 will move in the front-back direction.

At this time, the shoe 18 slides along the side surface of the rear workbench 5 to prevent the stay members 8 and 9 from being displaced in the left-right direction.

Next, the operation of the segment circularity holding device of the present invention described above will be explained with reference to FIGS. 7 to 9.

Segments 3 assembled in a circle as shown in Figure 7
A shield jack 2 is installed between the front end of the shield machine 1 and the shield machine 1.
0 is inserted, the stay members 8 and 9 are extended by the gripper jack 10, and the inner surface of the segment 3 assembled in a circular shape is pressed by the gripper shoe 11 to correct the misalignment, step, deformation, etc. of the segment 3. and hold it in a perfect circle.

Next, shield jack 20, front and rear slide jack 14
is extended, and the shield machine 1 is excavated as shown in FIG. 8 with the stay members 8 and 9 intact.

The shoes 19 of the stay members 8 and 9 that press the gripper shoe 11 against the segment 3 are separated from the guide rail 7 at this time, and the stay members 8 and 9 are connected to the shield machine 1 via the pin 13 and the spherical joint 15. Since they are connected only by the front and rear slide jacks 14, even if pitching, rolling, yawing, etc. occur in the shield machine 1, the stay members 8 and 9 will not be affected.

When the shield machine 1 completes digging one ring of the segment 3, the gripper jack 10 is retracted to contract the stay materials 8 and 9 as shown in FIG. 9, and the gripper shoe 11 is separated from the segment 3 to remove the stay. The materials 8 and 9 are suspended on the guide rail 7.

In this state, the front and rear slide jacks 14 are retracted to move the stay members 8 and 9 forward by 1977 of the segment 3, and the shield jack 20 is retracted to assemble a new one-ring segment 3 in a circular shape, completing one process. .

As explained above, in the present invention, the stays that hold the segments in a perfect circle are connected to the shield machine only by the front and rear slide jacks via spherical joints, so pitching when the shield machine excavates, rolling,
The segments can be held in a correct circular shape without being affected by yawing or the like.

In addition, a balance jack with a shoe that comes into contact with the side of the workbench is attached to the stay material, so the stay material does not fall to the left or right, and when the stay material is drawn toward the shield machine, it is guided so that it does not deviate from the center. Circle along the rail.

It can be followed smoothly.

In addition, arc-shaped gripper shoes are attached to both the upper and lower ends of the stay material, so the segment pressing force is balanced, and it is possible to reliably correct misaligned segments, steps, deformations, etc., and the pressing force can be adjusted as desired. be able to.

Furthermore, the gripper shoe can slide on the guide rule when moving the gripper shoe forward.
When the shoe is activated, it separates from the guide rail, so when the segment is held perfectly circular, the shoe separates from the guide rail and becomes completely free, allowing the shield machine to rotate.
Even if it meanders, it does not interfere with the segment perfect circle holding device, and the device is not adversely affected by mechanical warping or galling.

Furthermore, since the structure is simple, maintenance is easy.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view of an example of a conventional device, FIG. 2 is a sectional view taken along line II-II in FIG. 1, FIG. 3 is a longitudinal sectional side view of another example of the conventional device, and FIG. 5 is a longitudinal sectional view of an embodiment of the present invention, the left half of FIG. 6 is a line AA of FIG. 5, and the right half is a line BB of FIG. 5. The sectional view and FIGS. 7 to 9 are operation explanatory views. 1... Shield machine, 5... Rear workbench, 7... Guide rail, 8, 9...
Stay material, 10...Gripper jack, 11
...Gripper shoe, 15 ... Spherical joint, 14 ... Front and rear slide jack, 17.
...Balance jack, 18... Shoe

Claims (1)

[Scope of utility model registration request] A workbench attached to the shield machine, a guide rail attached to the workbench in the front-rear direction, a stay material located on both sides of the workbench and capable of expanding and contracting in the vertical direction, and a stay material at both upper and lower ends of the stay material. The attached arc-shaped gripper shoe has one end connected to one of the stay material or the workbench via a spherical joint, and the other end is pivoted to the other end of the stay material or the workbench, and the stay material is connected to the guide rail. a balance jack having one end attached to the stay member and the other end having a shoe that abuts against the side surface of the workbench; a bracket fixed to the stay member; When the gripper shoe attached to the bracket is brought into contact with the inner periphery of the ring-shaped segment, it floats up from the guide rail, and when the gripper shoe is separated from the segment, it is placed on the guide rail. A segment circularity holding device characterized by comprising a shoe configured to hold a segment.