JPH0417669Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a shield jack for a shield tunneling machine, and in particular, to a shield jack that can double as a tension jack used during curved construction.

[Prior Art] Generally, curve construction using a shield excavator is carried out by the following means.

First, the overall structure is as shown in Figure 6.
A cutter c is provided on the front end b of the shield frame a, and a plurality of shield jacks d are provided on the inner circumferential portion of the frame a with their expansion and contraction directions directed in the axial direction of the frame a. This shield jacket d
The cylinder portion e is fixed to the shield frame a, and the rod portion f extends rearward. Furthermore, the rear part of the frame a is provided with a tail rib g for receiving a rear pulling force.

A segment h is assembled at the rear of the shield frame a to prevent collapse of the ground, etc., and when performing curved construction, the base end of the tension jack i is locked to this segment h. ,
One end of a tension wire k is attached to the tip of the rod portion j. Furthermore, tension wire k
The other end is attached to the tail rib g of the shield frame a.

When the shield excavator configured as described above changes the excavation route, the shield jack d on the inside l of the change curve (trajectory drawn when the shield excavator moves forward while changing the route) is driven. is stopped, a tension jack i is attached to the segment h on the inside l, and this jack i and the tail rib g are connected via a tension wire k.
Then, the tension jack i is used to pull the shield frame a on the inside of the modified curve l to the rear, and the shield jack on the outside of the modified curve m is pulled backward.
is extended, a reaction force is applied to the segment h, and the shield frame a is pushed forward in the excavation direction.

In this way, a rotational moment was generated in the shield tunneling machine to change the tunneling path.

[Problems to be solved by the invention] By the way, the above-mentioned conventional system has the following problems.

(1) When constructing a curved line, it is necessary to specially install a tension jack i to change the excavation path of the excavator itself.

(2) As the shield excavator advances in excavation during curve construction, it is necessary to periodically move the tension jack i forward.

(3) Due to (1) and (2), the cost of tension jack i and work costs such as relocation of jack i increase, and
Relocation work is dangerous.

(4) Since the tension jack i is installed on the inner periphery of the segment h, the empty space inside the tunnel becomes narrow, and especially in the case of a small diameter tunnel, it is difficult to secure the installation space for the tension jack i. There is.

The present invention was developed in view of the above points, and its purpose is to enable curved construction without providing a special tension jack, and to
An object of the present invention is to provide a shield jack for a shield excavator that improves workability and safety and can save labor.

[Means for Solving the Problems] In order to achieve the above object, the present invention connects the cylinder part to the front part in the shield frame and digs out a shoe provided in the rod part that extends and contracts from the cylinder part. In a shield jack for a shield excavator that moves the entire shield frame forward in the excavation direction by releasably engaging a segment disposed at the rear in the direction, the shoe is attached to the tip of the rod part. In addition to forming a shoe attachment part, a tension wire pulling bracket is formed, one end of which is locked to the segment, and the other end of the tension wire is locked.

[Operation] When the shield excavator moves straight through the ground, the shield jacks at opposing positions within the shield frame are simultaneously extended to take reaction force to the segments and move the entire shield frame forward.

When changing the excavation course, one end of the tension wire is attached to the shield jack on the inside of the change curve, which is the trajectory when the shield excavator moves forward while changing the course, and the other end is fixed to the segment.
Then, extension resistance is applied to the shield jack, and the shield jack on the outside of the change curve is extended to generate a rotational moment in the entire shield frame, thereby changing the excavation path.

[Example] An example of the present invention will be described below with reference to the accompanying drawings.

First, the overall structure will be explained based on FIG. 5.

Reference numeral 1 denotes a shield frame, and a cutter 3 is rotatably provided at the front end 2 of the shield frame. A plurality of shield jacks 4 are arranged at equal intervals on the inner circumference of the shield frame 1. The shield jack 4 has its expansion and contraction direction directed in the axial direction of the shield frame 1, and the rod portion 5 of the jack 4 extends rearward. Note that 6 is a tension wire, and 7 is a shield jacket.

In addition to the above-mentioned members, the shield frame 1 is provided with a mechanism for carrying out excavated earth and sand, an erector for extending segments, etc., although not shown.

At the rear of the shield frame 1, segments 8, which are assembled by the erector at the rear inside the shield frame 1, are provided all over the inner circumference of the tunnel in order to prevent the collapse of the ground.

The structure of the above shield jack 4 is shown in Figures 1 to 4.
It is as shown in the figure.

A bracket 10 for supporting the cylinder portion 9 of the shield jack 4 is provided at the base end (left end in the figure) of the cylinder portion 9 of the shield jack 4. At the other end of the rod portion 5 with the piston 11 attached to one end,
A shoe attachment portion 12 for attaching the shield jacket 7 is formed. Furthermore, this shoe attachment portion 12 is provided with a tension wire pulling bracket 13 for obtaining pulling force from the segment 8. Note that this bracket 13 is formed integrally with the shoe attachment part 12 in FIGS. 1 and 2, and is formed independently of the shoe attachment part 12 in FIGS. 3 and 4. installed.

In the shield jack 4 constructed as described above, the bracket 10 on the cylinder portion 9 side is attached to the shield frame 1, and the shoe attachment portion 12 side can pivot in the direction of the axis of the shield frame 1. This is shield frame 1
This is to absorb the force in the lateral direction (in the radial direction of the shield frame 1) that acts on the shield jack 4 that is in pressure contact with the segment 8 when turning in conjunction with changing the excavation course.

Next, the effect will be explained.

When the shield excavator moves straight through the ground, among the plurality of shield jacks 4 provided in the shield frame 1, the shield jacks 4 at opposite positions are made into a pair and extended simultaneously. As a result, shield jack 7 is connected to segment 8.
The entire shield frame 1 is moved forward by taking a reaction force. The number of shield jacks 4 to be driven varies from one to a plurality of sets depending on the required propulsive force.

When changing the excavation course, attach the tension wire 6 to the tension wire traction bracket 13 of the shield jack 4 located inside 14 of the change curve (the trajectory drawn when the shield excavator moves forward while changing the course). One end is attached and the other end is fixed to segment 8. Then, the hydraulic oil is pressurized by the relief valve on the extension resistance side 15 of the cylinder 9 of the shield jack 4 to provide extension resistance to the jack 4, and at the same time, the extension side 17 of the cylinder 9 of the shield jack 4 located on the outside 16 of the change curve Hydraulic oil is sent to extend the jack 4 to apply a rotational moment to the shield frame 1. At the same time, by excavating the face with the cutter 3, the shield frame 1 gradually changes the excavation direction. The lateral force acting on the shield jack 4 due to the deflection of the shield frame 1 in the excavation direction is absorbed by the jack 4 being rotatably mounted via the bracket 10 on the cylinder 9 side. Ru.

[Effects of the invention] In summary, the present invention provides the following excellent effects.

(1) No special tension jack was installed, and the existing shield jack was used to perform the function of the tension jack, so it was easy to install more tension jacks and to change the tension jack as the shield excavation machine progresses in excavation. Relocation is no longer necessary, reducing costs, improving safety, and improving work efficiency.

(2) The tension jack installed on the inner periphery of the segment is eliminated, so the work space becomes wider.

[Brief explanation of the drawing]

1 and 3 are partially cutaway views showing the shield jack of the present invention, FIG. 2 is a view taken along the - line in FIG. 1, and FIG. 4 is a view taken along the - line in FIG. FIG. 5 is a sectional view showing a shield tunneling machine equipped with the shield jack of the present invention, and FIG. 6 is a sectional view showing a conventional shield tunneling machine. In the figure, 1 is a shield frame, 4 is a shield jack, 5 is a rod portion of the shield jack, 6 is a tension wire, 8 is a segment, and 13 is a bracket for pulling the tension wire.

Claims (1)

[Scope of utility model registration request] The cylinder part is connected to the front part inside the shield frame, and a shoe provided on a rod part that extends and contracts from the cylinder part is removably engaged with a segment arranged at the rear in the excavation direction, thereby forming the entire shield frame. In the shield jack of the shield excavator which is moved forward in the excavation direction, a shoe attachment part for attaching the shoe is formed at the tip of the rod part, and a tension wire is fixed at one end to the segment. A shield jack for a shield excavator, characterized in that a tension wire traction bracket is formed to lock the other end.