JPH0635332U - Excavator for underground wall with variable cross section - Google Patents

Abstract

(57) [Summary] [Purpose] While excavating the cutter drum horizontally while displacing it in the direction orthogonal to the rotation axis, the cutter drum can be extended laterally with a small stroke of the drive hydraulic cylinder. I will let you. [Structure] An upper end portion of a vertical piece portion 5a of an L-shaped bracket 5 is rotatably attached to a lower end portion of a main body frame 4 via a horizontal hinge shaft 6, and a horizontal piece portion 5 of the L-shaped bracket 5 is attached.
The drum base 3 is integrally attached to the lower surface of b, and the cutter drum 2 is provided below the drum base 3. The other ends of the first link plate 7 whose one end is connected to the upper end of the L-shaped bracket vertical piece 5a and the other end of the second link plate 8 whose one end is connected to the tip of the L-shaped bracket horizontal piece 5b The tip of the piston rod of the hydraulic cylinder 9 is connected to the point where the cylinder is connected, and the base end side of the cylinder is connected to the main body frame 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an underground wall excavator having a rotary cutter drum at the bottom of a frame such as a hydro-phrase excavator, and in particular, the cutter drum is laterally displaced in the excavation groove to form a cross-sectional shape of the groove. The present invention relates to an excavation device for a ground wall with a variable cross section, which has the function of changing

[0002]

[Prior art]

 For the purpose of setting the rigidity distribution of the wall surface of the underground wall to be constructed in an arbitrary pattern, or expanding the part of the wall surface to partially increase the wall thickness for the purpose of avoiding obstacles in the ground. The wall body may be locally expanded in the horizontal longitudinal direction of the wall surface. An underground wall with a partially different cross-sectional shape is called a variable-section underground wall. In order to construct the above-mentioned underground wall with a variable cross section, the width of the excavation trench is partially enlarged, or the excavation is locally extended within the trench in the horizontal longitudinal direction of the wall surface.

When excavating a trench for an underground wall with a hydro phrase excavator or the like, a frame provided with a rotary cutter drum at the bottom is hung while the rotation axis of the cutter drum is kept substantially horizontal. In addition, the excavation work is generally carried out in a posture in which the direction of the rotation axis matches the width direction of the groove (the thickness direction of the underground wall). In order to excavate the groove for the underground wall with the variable cross section with this type of excavating device, the cutter drum is displaced in the excavating groove in the direction of its rotation axis, and the excavation is performed so that the side surface of the groove is widened. In some cases, the cutter drum is displaced in the direction orthogonal to the rotation axis direction and the groove is extended and excavated in the horizontal longitudinal direction.

As the latter device for excavating a groove for an underground wall with a variable cross section by displacing a cutter drum in a direction orthogonal to its rotation axis, a configuration as shown in FIG. No. 62-10323).

In the apparatus of FIG. 1, two cutter drums 32 are mounted on the lowermost part of a main body frame 31 in a left-right symmetrical arrangement. Each cutter drum 32 is mounted on the lower part of a T-shaped drum base 33, and is attached to the main body frame 31 via the drum base 33. The drum base 33 is attached rotatably around horizontal hinge shafts 34 located at both lower ends of the main body frame 31, and the rotary shaft of the cutter drum 32 is parallel to the hinge shaft 34 so that the device is in a suspended state. And the cutter drum 32 becomes horizontal. Therefore, by rotating the drum base 33 about the hinge shaft 34, the cutter drum 32 is displaced in the direction orthogonal to the rotation shaft. This outward displacement is the displacement of the cutter drum 32 for partially expanding the trench.

A hydraulic cylinder 35 is attached to each of the drum bases 33 as a driving unit that rotationally displaces the cutter drum 32 together with the drum base 33. The hydraulic cylinder 35 connects almost the center of the upper surface side of the drum base 33 and the central portion of the main body frame 31. When the hydraulic cylinder 35 is contracted, the cutter drum 32 approaches the center directly below the main body frame 31, and the hydraulic cylinder When 35 is extended, the cutter drum 32 is displaced so as to project to the side of the body frame 31.

[0007]

[Problems to be solved by the device]

 In the conventional apparatus shown in FIG. 1, the drum base 33 is hinge-coupled to the main body frame 31, and the drum base 33 itself is rotationally displaced by the hydraulic cylinder 35 so that the cutter drum 32 is laterally projected. However, even if the rotation angle of the drum base 33 is increased considerably, the lateral extension of the cutter drum 32 does not become so large. In other words, the amount of displacement of the cutter drum 32 cannot be made large, so the expansion dimension that can be expanded and excavated in one operation is small, and if a large expansion dimension is required, the expansion and excavation must be repeated several times. There wasn't.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide an excavating device for an underground wall with variable cross section, which displaces a cutter drum in a direction orthogonal to a rotation axis thereof to perform an extended excavation. The purpose is to realize a compact mechanism that allows the cutter drum to be extended laterally greatly with a small stroke of the hydraulic cylinder.

[0009]

[Means for Solving the Problems]

 The excavation device for a variable section underground wall according to the present invention is formed in an L-shape with a vertical piece and a horizontal piece, and the upper end of the vertical piece is connected to the lower end of the body frame via a horizontal hinge shaft. And a drum base integrally attached to the lower surface of the lateral piece of the L-shaped bracket, and a cutter drum mounted on a lower portion of the drum base. A first link plate whose one end is connected to the upper end of the L-shaped bracket vertical piece, a second link plate whose one end is connected to the tip of the L-shaped bracket horizontal piece, and the first link plate A piston rod tip is connected to a point at which the other ends of the link plate and the second link plate are connected to each other, and a hydraulic cylinder connected to the main body frame on the cylinder base end side is provided.

[0010]

[Action]

 The drum base is attached to the main body frame via the L-shaped bracket. Since the upper end of the vertical piece of the L-shaped bracket is attached to the main body frame by the hinge shaft, the swing center of the cutter drum (the hinge shaft) is located considerably above the cutter drum. The L-shaped bracket is connected to the hydraulic cylinder via the two link plates, and the expansion and contraction of the hydraulic cylinder causes the L-shaped bracket to rotate about the hinge shaft. Therefore, the cutter drum can be greatly extended in the lateral direction with a small stroke of the hydraulic cylinder.

[0011]

【Example】

 FIG. 2 shows a schematic configuration of an excavation device for an underground wall with a variable cross section according to an embodiment of the present invention. In FIG. 2, 2 is a cutter drum, 3 is a drum base, 4 is a main body frame, and 5 is an L-shaped bracket.

The L-shaped bracket 5 is formed in an L shape by a vertical piece 5a and a horizontal piece 5b, and the drum base 3 is integrally fixed to the lower surface of the horizontal piece 5b. The drum base 3 has a T-shaped structure, and is equipped with a cutter drum 2 driven by a hydraulic motor in a direct drive system on both sides of a vertical portion thereof.

In the embodiment shown in FIG. 2, two cutter drums 2 are provided at the bottom of the main body frame 4 in a symmetrical configuration. That is, there are two parallel hinge shafts 6 that are horizontal in the suspended state of the frame 4 at both ends of the lower portion of the main body frame 4, and the L-shaped brackets 5 are attached to the hinge shafts 6 respectively. The two L-shaped brackets 5 are arranged face to face, and the upper end of each vertical piece 5a is connected to the hinge shaft 6 so as to be rotatable about the shaft 6. The rotary shaft of the cutter drum 2 attached to the L-shaped bracket 5 via the drum base 3 and the hinge shaft 6 are arranged in parallel. Therefore, when the L-shaped bracket 5 is rotated around the hinge shaft 6, the cutter drum 2 is displaced in the direction orthogonal to the rotation shaft thereof, and the cutter frame 2 projects laterally of the main body frame 4.

Further, one end of the first link plate 7 is connected to the hinge coupling portion at the upper end of the vertical bracket portion 5a, and one end of the second link plate 8 is connected to the tip portion of the horizontal bracket portion 5b. It is connected. The first link plate 7 is slightly longer than the second link plate 8, and the other ends of both plates 7 and 8 are connected to each other. A hydraulic cylinder 9 is provided between the connecting point of the plates 7 and 8 and the body frame 4. The piston rod tip of the hydraulic cylinder 9 and the connection point 9a between the plates 7 and 8 and the base end of the hydraulic cylinder 9 and the connection point 9b between the body frame 4 are both rotatable by a pin parallel to the hinge shaft 6. It has become. Therefore, when the hydraulic cylinder 9 is reduced, the cutter drum 2 approaches the vertical center line of the main body frame 4 as shown on the right side of FIG. 2, and when the hydraulic cylinder 9 is extended, the cutter cylinder 2 is extended as shown on the left side of FIG. The drum 2 rotates together with the L-shaped bracket 5, and the cutter drum 2 moves away from the vertical center line of the main body frame 4 (extends in the lateral direction).

A general method of using the excavation device for a variable section underground wall having the above-described structure will be described below.

In order to perform a normal work for excavating a vertical groove having a constant width, the hydraulic cylinders 9 on both the left and right sides are contracted, and both L-shaped brackets 5 are brought close to each other and placed under the main body frame 4. And the distance between the axes of the two cutter drums 2 is minimized. That is, the entire apparatus is constructed vertically, the cable is suspended, and the groove is vertically excavated by the cutter drum 2 at the bottom.

In order to widen or expand the groove wall surface at an appropriate position in the vertical groove having a constant width excavated as described above, the rocking drive hydraulic cylinder 9 is appropriately extended. Then, the L-shaped bracket 5 rotates about the hinge shaft 6, the axial distance between the two cutter drums 2 is expanded, and the excavation wall surface is expanded and excavated horizontally inside the groove. When the cutter drum 2 is displaced by the amount corresponding to the predetermined expansion dimension, the hydraulic cylinder 9 is kept in that state, the entire apparatus expanded to the left and right is gradually lowered, and the excavation is further expanded downward.

FIG. 3 shows another embodiment of the present invention. In the embodiment shown in FIG. 2, two cutter drums 2 are arranged in parallel with an appropriate axial distance, but in the embodiment shown in FIG. 3, two cutter heads 2 are arranged in a straight line in series. . The structure for mounting the individual cutter drums 2 under the main body frame 4 (the structure of the drum base 3, the L-shaped bracket 5, the link plates 7 and 8, and the hydraulic cylinder 9) is the same as that of FIG. The hinge shafts 6 of are aligned.

[0019]

[Effect of device]

 As described above in detail, in the excavator for a variable section underground wall according to the present invention, the drum base equipped with the cutter drum is not directly hinged to the main body frame but is connected via the L-shaped bracket. Since the L-shaped bracket and the hydraulic cylinder are connected to each other by a hinge on the body frame, the swing center of the cutter drum (the hinge shaft of the L-shaped bracket) is positioned above the cutter drum. Therefore, the cutter drum can be greatly extended laterally with a small stroke of the hydraulic cylinder. Therefore, the expansion dimension in one expansion excavation can be made considerably larger than in the past, and the work efficiency of this type of trench excavation for underground wall with variable cross section is improved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a conventional excavation device for a variable section underground wall.

FIG. 2 is a schematic configuration diagram of an excavation device for an underground wall with a variable cross section according to an embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of an excavation device for an underground wall with a variable cross section according to another embodiment of the present invention.

[Explanation of symbols]

 2 Cutter drum 3 Drum base 4 Body frame 5 L-shaped bracket 5a Vertical piece 5b Horizontal piece 6 Hinge shaft 7 First link plate 8 Second link plate

Claims (1)

[Scope of utility model registration request] 1. A vertical piece and a horizontal piece are formed in an L shape,
The upper end of the vertical piece is attached to the lower end of the body frame so as to be rotatable via a horizontal hinge shaft, and is integrally attached to the lower surface of the horizontal piece of the L bracket. A drum base, a cutter drum mounted on a lower portion of the drum base, a first link plate having one end connected to an upper end of the L-shaped bracket vertical piece portion, and an L-shaped bracket horizontal piece portion. The second link plate, one end of which is connected to the tip portion, and the piston rod tip, which is connected to the point where the other end portions of the first link plate and the second link plate are joined, and the cylinder base end side of which is the main body. An excavation device for an underground wall of variable cross section, comprising: a hydraulic cylinder connected to a frame.