JPH0589598U - Tunnel excavator - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an excavator capable of excavating the upper and lower stages of a large-section tunnel with one unit. [Structure] A main link 9 that connects a swinging platform 6 and a main arm 10 and is swingable in the front-rear direction.
A link jack 15 for driving the main link 9 in the same direction, and a boom link jack 17 for vertically rotating the main arm 10. Furthermore, the main arm 10
Of the connecting arm 11, which is swingably supported in the left and right direction at the tip of the boom, a boom knuckle jack 19 which drives the connecting arm 11 in the same direction, and a cutter which is swingably supported in the up and down direction at the tip of the connecting arm 11. The boom 12 and the boom tilt jack 21 that drives the cutter boom 12 in the same direction are provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a tunnel excavator for a large section.

[0002]

[Prior Art]

 Excavation of large cross-section tunnels with a diameter of around 10 m is often done in two steps to prevent collapse of the face.

That is, the upper stage is first excavated to carry out support and primary lining, and then the lower stage is excavated and provided with support and primary lining. The lower face is up to several tens of meters behind the upper face, and each face has a face excavator and a shearing machine.

[0004]

[Challenges for devising]

 However, in such a two-step digging method, it is necessary to separately prepare work machines such as an excavator for the upper tier and the lower tier, and the number of workers increases accordingly, so the cost becomes higher. There was a problem.

In order to solve the above problems, an object of the present invention is to provide an excavator capable of excavating the upper stage and the lower stage of a large-section tunnel with one unit.

[0006]

[Means for achieving the object]

 The present invention includes a main link that connects a swinging platform and a main arm and can swing in the front-rear direction, a link jack that drives the main link in the same direction, and a boom link jack that rotates the main arm up and down. A connecting arm that is swingably supported in the left-right direction at the tip of the main arm, a boom knuckle jack that drives the connecting arm in the same direction, and a swingable vertical motion at the tip of the connecting arm. It has a cutter boom and a boom tilt jack that drives the cutter boom in the same direction.

[0007]

[Action]

 The boom link jack causes the main arm to rotate between an upward position and a downward position. Also, by driving the cutter boom up and down with the boom tilt jack, the cutter head at the tip of the cutter boom moves vertically in a wide range.

On the other hand, the turning of the platform and the boom knuckle jack driving the connecting arm to the left and right cause the cutter head to move greatly in the left and right directions.

Further, by driving the link jack to rotate the main link back and forth, the cutter head also moves back and forth.

Since the moving range of the cutter head is large in this way, it is possible to excavate a large cross section with one excavator, and by excavating the upper stage several meters ahead of the lower stage, the upper stage precedes the lower stage. It is possible to carry out lining and carry out two-step digging.

[0011]

【Example】

 1 to 3 show an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes an excavator that is driven by a crawler 2, and a platform 6 is rotatably supported on a frame 3 to which the crawler 2 is mounted via a slewing bearing 4 and an arc-shaped slide pad 5. It The frame 3 includes outriggers 7 and 8 on the front and rear.

A cutter boom 12 is supported on the platform 6 via a main link 9, a main arm 10 and a connecting arm 11, and a cutter head 13 for cutting a face is attached to the tip of the cutter boom 12.

The main link 9 has one end hinged to the platform 6 and the other end hinged to the base end of the main arm 10. A link jack 15 is supported at an intermediate portion of the main link 9 via a trunnion 14. The tip of the link jack 15 is connected to the platform 6, and the main link 9 rotates forward and backward according to the expansion and contraction of the link jack 15.

A boom link jack 17 is supported at an intermediate portion of the main arm 10 via a trunnion 16. The boom link jack 17 has its tip hinged to the front part of the platform 6 so as to be substantially parallel to the main link 9.

The connecting arm 11 is supported at the tip of the main arm 10 via a knuckle pin 18 so as to be swingable in the lateral direction. A boom knuckle jack 19 is supported on the side surface of the main arm 10, and its tip is connected to a bracket 20 protruding from the connecting arm 11. The tip of the connecting arm 11 rotates left and right according to the expansion and contraction of these boom knuckle jacks 19.

The cutter boom 12 is vertically swingably connected to the tip of the connecting arm 11, and the cutter head 13 at the tip is moved up and down according to the extension and contraction of the boom tilt jack 21 interposed between the cutter boom 12 and the connecting arm 11. Turn to.

As shown in FIGS. 2 and 3, one boom link jack 17 and one boom knuckle jack 19 are provided on the left and right sides of the main arm 10 and the connecting arm 11, respectively.

Each jack 15, 17, 19, 21 is hydraulically driven. A hydraulic pump that supplies these hydraulic pressures and a prime mover that is a swing power source of the platform 6 are mounted on the rear portion of the frame 3.

Next, the operation will be described.

The excavator 1 is moved by the crawler 2 and grounds the front and rear outriggers 7 and 8 in a stopped state during excavation.

When excavating the upper section, as shown by the solid line in FIG. 1, the link jack 15 is retracted to hold the main link 9 in the rearward tilted position, and the boom link jack 17 is extended to extend the main arm 10. Increase the elevation angle of. In this state, if the boom link jack 17 is expanded and contracted and the platform 6 is rotated, the main arm 10 is rotated vertically and horizontally, and the rotating cutter head 13 is moved to a desired position in the excavation cross section.

Further, as the excavation progresses, the cutter head 13 needs to be advanced, and in that case, the link jack 15 is extended. This causes the main link 9 to rotate forward and the main arm 10 to move forward, so that the cutter head 1 also moves in a wide range in the front-rear direction as shown by the chain line around the solid line in FIG. In this way, the upper face of the cutting face is excavated by moving the cutter head 13 in a wide range in the vertical and horizontal directions and in the front and rear directions.

Further, by appropriately expanding and contracting the boom knuckle jack 19 and the boom tilt jack 21, the cutter boom 12 swings its head left and right and up and down, and the cutter head 13 comes into contact with rock mass from various angles. Therefore, the rock mass can be cut efficiently.

When the excavation of the predetermined section is completed, the excavator 1 is retracted to support the excavation section and perform the primary lining work. At this time, since the excavator 1 is located at the lower stage, it can be easily retracted.

After the primary lining of the upper stage is completed, the excavator 1 excavates the lower stage of the face. In this case, the boom link jack 17 is contracted so that the cutter head 13 is located below the face, and the elevation angle of the main arm 10 is reduced. At the beginning of excavation, the link jack 15 is contracted to hold the main link 9 in the backward tilt position. In this state, as in the case of excavating the upper stage, the main arm 13 is rotated vertically and horizontally by turning the platform 6 and expanding and contracting the boom link jack 17, and the boom knuckle jack 19 and the boom tilt jack 21 are appropriately expanded and contracted to excavate rock mass. To do. Further, the link jack 15 is extended and the cutter head 13 is advanced according to the progress of excavation.

When the excavation of the lower face of the face is completed in this way, support and primary lining are also applied to this portion, and then the excavator 1 moves forward to excavate the next span above the face.

In this way, by excavating the upper and lower stages, supporting work, and primary lining while advancing the upper stage by several meters ahead of the lower stage, two-stage excavation by one excavator 1 is performed. Therefore, the tunnel can be constructed safely and efficiently.

Since the excavator 1 moves the cutter head 13 by linking the link mechanism, the excavator 1 has few mechanical sliding parts and is less likely to be worn by sliding parts due to dust, and thus has excellent durability.

[0030]

[Effect of the device]

 As described above, according to the present invention, since the swinging platform and the main arm are connected by the main link and the main link is rotated by the link jack, the main arm moves forward according to the rotation of the main link. It can excavate a wide range. In addition, it is equipped with a connecting arm that swings left and right at the tip of the main arm, and a cutter boom that swings vertically at the tip of the connecting arm. Can be cut from various angles.

Therefore, the excavation work by the two-stage excavation of the tunnel having the large cross section can be performed by one excavator, which has a great effect on the efficiency of the tunnel excavation work.

[Brief description of drawings]

FIG. 1 is a side view of a tunnel excavator.

FIG. 2 is a plan view of the same seen from above.

FIG. 3 is a front view of the same.

[Explanation of symbols]

 1 Excavator 6 Platform 9 Main Link 10 Main Arm 11 Connecting Arm 12 Cutter Boom 13 Cutter Head 15 Link Jack 17 Boom Link Jack 19 Boom Knuckle Jack 21 Boom Tilt Jack

Claims (1)

[Scope of utility model registration request] 1. A main link that connects a swinging platform and a main arm and is swingable in the front-rear direction,
A link jack that drives the main link in the same direction, and a boom link jack that rotates the main arm up and down.
A connecting arm that is swingably supported in the left and right direction at the tip of the main arm, a boom knuckle jack that drives the connecting arm in the same direction, and a cutter boom that is swingably supported in the up and down direction at the tip of the connecting arm. , A tunnel excavator characterized by comprising a boom tilt jack for driving the cutter boom in the same direction.