JPH0545670Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a shield excavator capable of performing curved construction.

BACKGROUND ART Conventionally, a shield excavator capable of performing curved construction has been divided into two halves, front and rear, and a front body 31 and a rear body, which are connected via a pin 34 so as to be tiltable, as shown in the schematic cross-sectional plan view of FIG. 10, for example. In the shield main body 33 consisting of a shell 32, a plurality of shield jacks 36 each having a jack main body 36a connected thereto are provided in the front shell 31 having a cutter head 35, and the jack main body 36a is supported by the support portion 39 of the rear shell 32. A contact member 37 is provided at the operating end of the shield jack 36, and this contact member 37 is connected to the segment 38.
The front end of the front body 3
1 was tilted about the pin 34 with respect to the rear body 32 to perform curved construction.

Problems to be Solved by the Invention However, with the above-mentioned conventional configuration, when constructing a steep curve, the front body 31
As the front body 3 is tilted with respect to the rear body 32, the front body 3
The shield jack 36 supported by the rear body 32
There was a problem in that the direction of extension toward the segment 38 side also changed as the abutting member 37 did not accurately abut against the front end of the segment 38, making it impossible to reliably obtain propulsion force.

The object of the present invention is to solve the above-mentioned problems and provide a shield excavator that can reliably obtain propulsion even when working on steep curves.

Means for Solving the Problems In order to solve the above problems, the present invention provides a shield body consisting of a plurality of bodies that are divided into front and rear parts and connected to each other so as to be tiltable within a predetermined range, and an external shield body is provided at the front of the segment. A plurality of shield jacks are provided inside the rear end side shell to be fitted, and are supported so as to be movable in the front and back direction, and the shield jacks are fitted into the front side shell by engaging with the fixed side ends of the shield jacks. A retaining member for retaining the retaining member and a pressure receiving member with which the fixed side end face of the shield jack formed in the front body tilting plane and having an arcuate cross section or a spherical shape are slidably abutted, and the retaining member is , in the locking grooves formed along the front body tilting surface on both sides of the fixed end side of the shield jack,
Consists of retaining pawls that are provided opposite each other on the front body and whose tips engage with a gap in the front-rear direction to prevent them from coming out, and can abut the front end of the segment on the operating end of the shield jack. A contact member is provided.

Effect In the above configuration, when performing curved construction, the extension amount of the shield jack on the outside of the bend is made larger than that of the shield jack on the inside of the bend, so that the front side shell is connected to the rear end side shell. and tilt it.
Furthermore, each shield jack is extended by a predetermined amount and moved forward along the curved direction by the reaction force that presses the segment of the abutting member. At this time, the shield jack is supported by the rear body so as to be movable in the front and back direction, and the fixed end portion is slidably abutted on the pressure receiving member and is prevented from coming out by the retaining member to propel the shield jack. The force is reliably transmitted to the front side shell, and the direction of the shield jack is constant with respect to the rear shell regardless of the inclination of the front shell. Because it comes into contact with the
A stable propulsion force is always obtained.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

FIGS. 1 and 2 are a plan sectional view and a side sectional view showing a pressure holding type shield tunneling machine.
In FIGS. 1 and 2, 1 and 2 are the front and rear shells that are divided into front and rear parts and constitute the shield body 3. Connected so that they can tilt freely. That is, the front body hinge plate 6 is attached to the rear upper and lower positions in the front body 1 via the front body bracket 5.
and a rear body hinge plate 7 attached to the front upper and lower positions in the rear body 2 are rotatably connected by a pin 4. Reference numeral 8 denotes a tilting seal interposed at the overlapping portion of the front body 1 and the rear body 2.

Reference numeral 9 denotes a cutter head provided on the front surface of the front barrel 1, which is rotatably supported by a swing bearing 10 and rotationally driven by a drive device 11 via gears. 12 is the pressure chamber 1 at the rear of the cutter head 9
A screw conveyor penetrating the partition wall 14 forming the pressure chamber 13 conveys the earth and sand in the pressure chamber 13 to the rear body 2 side.

1 and 3, a plurality of shield jacks 15 are arranged around the front part of the rear body 2 at predetermined intervals in the front and back direction, and the jack main body 15a is fixed to the rear body 2. It is supported by a supporting member 16 so as to be slidable in the front-rear direction. The front end portion of the jack main body 15a is held by a retaining member 17 and a pressure receiving member 18 provided in the front body 1. That is, as shown in FIGS. 4a and 4b, the retaining member 17 has its distal end placed in a predetermined direction in the front-rear direction into a locking groove 19 formed horizontally facing the top and bottom sides of the front end of the jack main body 15a. A retaining pawl 20 that engages with a gap is provided to hold the jack main body 15a so as to be tiltable in the horizontal direction,
Also, it is configured to prevent the jack main body 15a from coming off in the front-rear direction. In addition, the pressure receiving member 18 has a planar receiving surface 22 formed on the rear surface of the pressure receiving body 21 protruding into the front body 1, and the front end surface of the jack main body 15a is formed into a convex spherical or circular arc shape on this receiving surface 22. A contact surface 23 formed in a planar shape (a spherical surface in the embodiment) is configured to come into slidable contact. The retaining claw 2
0 is fixed to the pressure receiving body 21.

Although the abutting surface 23 is made flat and the jack main body 15a is brought into contact with it, as shown in FIG.
The abutment surface 23 of 5a is also made into a circular arc surface, or the contact surface 23 of the seventh
As shown in the figure, both the receiving surface 22 and the abutting surface 23 may have a spherical shape so as to abut and support the jack main body 15a.

On the other hand, the actuator 15 at the rear of the shield jack 15
At the rear end b, an abutting member 25 is disposed which can abut against the front end of a segment 24 which will be assembled inside the rear torso 2. Reference numeral 26 denotes a tail seal provided around the rear end of the rear torso 2.

Next, the effect will be explained.

In the case of straight line construction, the cutter head 9 is driven to excavate the ground, and the earth and sand in the pressure chamber 13 is conveyed rearward by the screw conveyor 12 while maintaining the face collapse pressure in the pressure chamber 13. Then, the contact member 25 is brought into contact with the front end of the segment 24 by each shield jack 15 to uniformly extend the actuating body 15b, and the propulsive force is supported by the pressure receiving body 21 to move the front body 1 to the rear body 2. move forward with Next, actuating body 1
Shorten 5. At this time, the jack main body 15a is prevented from being removed by the anti-removal claw 20, and movement to the rear is prevented. Then, a new segment 24 is assembled, and the shield jack 15 is operated again to move the shield main body 3 forward.

In the case of curved construction, as shown in FIG. 5, while driving the cutter head 9 and screw conveyor 12,
The extension amount of the shield jack 15 on the outside of the bend (on the right side in the direction of travel in FIG. 5) is made larger than that of the shield jack 15 on the inside of the bend, and the front body 1 is tilted in the direction A about the pin 4. At this time, each shield jack 15 moves only in the front-rear direction with respect to the rear barrel 2 and is supported by the support member 16 parallel to the axis of the rear barrel 2, so the contact member at the tip of the operating body 15a 25 properly abuts on a predetermined position of the front end of the segment 24 from the rear body axis direction. The front end of the jack main body 15a is tilted as shown by the imaginary line A in FIG.
Slide the top to make proper contact, and then attach the shield jack 1.
5 thrust can be reliably transmitted to the pressure receiving body 21. Therefore, segment 24 as before
It is possible to reliably obtain propulsive force without applying an unbalanced load to the front end of the vehicle. Next, the shield body 3 is operated by controlling the amount of extension of each shield jack 15.
move forward in a curved direction.

In the above embodiment, the shield main body 3 is connected to the front body 1.
Although it is divided into the rear body 2, it may be divided into three or more. In this case, the retaining member for holding the front end of the jack main body of the shield jack and the pressure receiving member may be provided in the intermediate barrel.

Further, although the front body 1 and the rear body 2 are tiltably connected by a pin 4, as shown in FIGS. 7 and 8, they are connected by a plurality of connecting jacks 23, and the front body torso 1 to rear torso 2
The shield main body 3 may be tilted relative to the main body 3 and propelled by the shield jack 15.

Furthermore, although a pressure holding type shield tunneling machine is shown in the above embodiment, the present invention is not limited to this type.

Effects of the invention As described above, according to the invention, even if the front side body tilts with respect to the rear end side body during curved construction,
The shield jack is supported by the rear side body so as to be movable in the front and back direction, and its fixed end is prevented from coming out by a retaining member, and the pressure receiving member transfers the propulsive force of the shield jack to the front side body. Therefore, the contact member at the operating end of the shield jack appropriately contacts the front end of the segment, and the propulsive force can be reliably obtained without producing an unbalanced load as in the conventional case. In addition, since the retaining member is composed of a retaining pawl that tiltably engages with the locking groove formed on the shield jack, the structure is extremely simple, and the propulsive reaction force applied to the shield jack is directly transmitted to the pressure receiving member. can be transmitted to.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention, FIGS. 1 and 2 are a plan sectional view and a side sectional view of the shield tunneling machine, and FIG. 3 is the same as that shown in FIG. 1.
4a and 4b are partially enlarged views shown in FIG. 1, and FIG. 7 is a perspective view showing another embodiment of the pressure receiving member, FIGS. 8 and 9 are a front sectional view and a side view showing a connecting jack, and FIGS. FIG. 11 is a schematic cross-sectional plan view showing a conventional example and a cross-sectional plan view explaining its operation. 1...Front body, 2...Rear body, 3...Shield body, 4...Pin, 15...Shield jacket, 1
5a... Jacket main body, 15b... Operating body, 16
... Support member, 17 ... Removal prevention member, 18 ... Pressure receiving member, 19 ... Locking groove, 20 ... Removal prevention claw,
24... Segment, 25... Contact member.

Claims (1)

[Scope of utility model registration request] A shield body is provided with a plurality of shells that are divided into front and rear parts and are connected to each other so as to be tiltable within a predetermined range. A shield jack is provided, and a retaining member that engages with the fixed side end of the shield jack to prevent the shield jack from coming out is provided in the front side body, and a retaining member that has an arcuate cross section or a spherical shape within the front body tilting plane. A fixed side end face of the shield jack formed on the shield jack is provided with a pressure receiving member that is slidably abutted, and the retaining member is formed on both sides of the fixed end side of the shield jack along the front body tilting surface. The locking grooves are provided with retaining pawls that are provided on the front body facing each other and whose tips engage with a gap in the front-rear direction to prevent them from coming off. A shield excavator characterized in that a contact member that can come into contact with a front end of a segment is provided.