JP2512158Y2 - Excavator for underground wall with variable cross section - Google Patents

Description

[Detailed description of the invention] << Industrial application field >> This invention is an excavation for a variable section underground wall used for excavation of a section underground wall where the wall is partially widened and the rigidity distribution can be set as desired. Related to the device.

<< Prior Art >> Conventionally, as for a ground excavation device, it is known that a vertical clamshell bucket is used to pick up soil and excavate the ground, which is called a clamshell type. It is already known as seen in the publications such as 53-203.

<Problems to be solved by the invention> By the way, in the case of an underground wall with a variable cross section, the wall thickness is increased by widening a part of the wall in order to improve rigidity or avoid obstacles in the ground. For this reason, the groove side wall has to be excavated in the width direction, but a general excavating device such as the one disclosed in the above publication does not deal with excavation of the groove side wall, and other for excavating a widened portion. There is the inconvenience of requiring an auxiliary drilling rig. Then, the suspension excavator must be replaced each time, which is troublesome and inferior in workability.

The present invention has been made in view of the above background, and an object thereof is to provide an excavation device for a variable section underground wall which can excavate a groove as in the conventional case and can easily excavate a groove side wall. To do.

<Means for Solving the Problem> In order to achieve the above object, the present invention is a clamshell type that picks up earth and sand by a vertically movable clamshell bucket and excavates the ground. The upper edge is rotatably pivotally supported on the upper side surface part, and the lower edge is a side wall excavating member forming an excavating blade, and the side wall excavating member is driven around its pivot axis to maintain the state. And a position regulating means.

<Operation> With the above-described configuration, the side wall excavating member is rotated around its pivot axis by the drive of the position restricting means, so that the lower edge portion can be appropriately opened laterally.
The lower edge portion of the extended state, that is, the excavating blade is brought into sliding contact with the side wall of the groove as the clamshell bucket is suspended, and scrapes this.

<< Embodiment >> An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a front view showing a preferred embodiment of the underground wall excavator of the present invention, and FIG. 2 is a side view thereof.

This excavation device for underground wall with variable cross section is basically configured as a so-called clamshell type that excavates the ground by picking up earth and sand by a clamshell bucket 1 that can be vertically moved freely. That is, the clamshell bucket 1 is rotatably supported by the club frame 3 with the two buckets 2 and 2 facing each other, and between the club frame 3 and the buckets 2 and 2. Each hydraulic jack 4 is erected, the club frame 3 is fixed to the lower end of a kelly bar or the like (not shown) and is vertically moved freely, and both buckets 2 and 2 are moved by extending and retracting both hydraulic jacks 4 and 4. It is strongly opened and closed to catch dirt.

On the other hand, a side wall excavating member 5 is arranged on the side wall of the club frame 3. The side wall excavating member 5 is made of a plate material having a substantially rectangular shape and a substantially wedge shape in cross section, and is vertically arranged on a side wall portion of the club frame 3 which is an upper side surface of both buckets 2, 2 with an edge portion on the thick side facing upward. The thick edge (upper edge) is rotatably supported. An excavating blade 50 is formed at the thin wedge side edge (lower edge) of the side wall excavating member 5.

A hydraulic jack 6 is installed between the club frame 3 and the side wall excavating member 5, and by driving the jack rod 60 of the hydraulic jack 6 to extend and retract, the side wall excavating member 5 rotates about its pivot axis. Be moved. That is, the side wall excavating member 5 is rotationally driven by the hydraulic jack 6, and the lower edge portion thereof, that is, the excavating blade 50 is appropriately extended laterally. Further, the side wall excavating member 5 in the extended state is supported by the jack rod 60, and the hydraulic jack 6 serves as a position regulating means.

Now, FIG. 3 and FIG. 4 are sectional views of the excavation groove showing the excavation operation of the device of the present invention.

Since the excavation device for an underground wall with a variable cross section is the same as a conventional so-called clamshell type in a state where the side wall excavating member 5 is contracted and closed along the side surface of the club frame 3, in the conventional state, the groove 7 Excavate. At this time, a stabilizing liquid 8 such as a polymer for preventing the side wall from collapsing is formed in the groove 7.
Fill up.

Next, in the construction of the underground wall with a variable cross section, the side wall at a predetermined depth of the groove 7 must be excavated to form the widened portion 70. In this excavation, the side wall excavating member 5 is appropriately extended laterally. This can be done by suspending the clamshell bucket 1 while opening. That is, the sidewall excavation member 5 is the hydraulic jack 6
Is driven to rotate about its pivot axis, so that the lower edge portion, that is, the digging blade 50 can be appropriately laterally extended, and the digging blade 50 in the extended state can be moved to the clamshell bucket. With the suspension of No. 1, the side wall of the groove 7 is slidably contacted and scraped. In addition, excavation of this widened portion 70
Instead of shaving at a time, we decide to shave a few times. That is, the side wall excavating member 5 is sequentially opened little by little, and as shown in FIG. 4, shallow cutting is appropriately repeated to form the widened portion 70 having a predetermined width. This reduces the force required for one excavation.

That is, according to such a configuration, the side wall surface of the groove 7 can be easily excavated by appropriately extending the side wall excavating member 5. Further, since normal trench excavation can be carried out, there is no need for replacement as in the past, and workability is excellent.

<< Effects of the Invention >> As described above in detail in the embodiments, according to the excavation device for a variable section underground wall according to the present invention, the lower edge portion of the side wall excavating member, which is appropriately extended, that is, the excavating blade When the clamshell bucket is suspended, it comes into sliding contact with the side wall surface and scrapes it. For this reason, the widened portion can be easily excavated, and since the bucket is provided, if the side wall excavating member is contracted and closed, ordinary groove excavation can be performed as in the conventional case, and there is no need for replacement and excellent workability.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a side view thereof, and FIGS. 3 and 4 are sectional views of excavation grooves for explaining the excavation operation of the proposed device. 1 ... Clamshell bucket 2 ... Bucket 5 ... Side wall excavation member 50 ... Excavation blade 6 ... Hydraulic jacket (position control means)

Claims (1)

(57) [Scope of utility model registration request] 1. A clamshell type for picking up earth and sand by a vertically movable clamshell bucket for excavating the ground, the upper edge being rotatably pivoted at an upper side surface portion of the bucket. A variable cross section ground, characterized in that the supported lower edge portion is provided with a side wall excavating member forming an excavating blade, and position regulating means for driving the side wall excavating member around its pivot axis and maintaining the state. Excavation equipment for walls.