JPS603149Y2 - excavator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an excavator, and relates to an excavator suitable for use in excavating earth and sand immediately below the lower end to a uniform thickness when constructing a huge structure.

The well construction method is usually used to construct huge structures, and the important thing in this case is to excavate the earth and sand just below the bottom of the well to a uniform thickness so that the well sinks evenly.

- The excavation thickness for each excavation will vary depending on the size of the structure, ground condition, etc., but it is desirable to set it to an appropriate thickness according to the situation.

To this end, it is important to find a way to uniformly excavate the earth and sand just below the bottom end of the well.

However, since upward movement is restricted when removing earth and sand immediately below the bottom end of the well, uniform excavation cannot be performed using a packet or the like.

For example, Japanese Unexamined Patent Publication No. 52-35407 discloses a technique for excavating earth and sand immediately below the bottom end of a well by using an excavation packet and imparting a specific movement to the excavation packet.

However, with this technique, the drilling packet cannot be excavated along the inclination angle of the lower end portion of the well, and the movement of the drilling packet requires digging unnecessarily deep.

Therefore, it is not possible to excavate uniformly along the inclination angle of the bottom end of the well, which causes uneven settlement.

Also, it is not suitable for large wells due to the length of the arm.

The technique of using an excavator that can move freely under a well in order to excavate the lower part of a large well is well known and is disclosed, for example, in Japanese Patent Application Laid-Open No. 52-5905.

However, even excavation work along the slope angle cannot be performed using a normal packet.

Therefore, it is an object of the present invention to provide an excavator that can move along the inclination angle of the lower end of the well, thereby excavating earth and sand just below the lower end of the well to a uniform thickness.

According to the present invention, an excavator for excavating earth and sand immediately below the lower end of a structure to a uniform thickness is provided with a traveling body, an elevating arm is pivotally connected to the traveling body, and the excavator has a base plate. It has a first telescoping cylinder whose end is pivotally connected to the traveling body and whose piston tip is pivotally connected to the midpoint of the elevating arm, and a second telescoping cylinder on the elevating arm that causes the vibrator to stroke along the elevating arm. A cylinder is provided, a cutting blade is attached to the vibrating body, and a water injection hole for spraying a water jet is provided at the tip of the cutting blade.

Therefore, by aligning the elevating arm with the inclination angle of the bottom end of the well using the first telescoping cylinder, and inserting the cutting blade along the bottom end of the well via the vibrating body using the second telescoping cylinder, the water jet can be injected into the well. The lower end can be uniformly excavated by a distance corresponding to the thickness of the cutting blade (actually, it will be larger than the thickness of the cutting blade since a slight gap will be created).

The water jet makes it easy to excavate along the bottom edge of the well, even in hard ground.

Therefore, uniform well settlement can be obtained by uniform drilling operations.

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a running body, and in the illustrated example, the running body 1 is equipped with an endless track so that it can run, and is also equipped with a turning table 2.

3 It is an elevating arm bent into a dogleg shape, and its base end is pivoted 4 to the upper surface of the rotating table 2. The base end is pivoted 6 to the traveling body 1, and the tip of the piston is at the midpoint of the elevating arm 3. It is designed to be lifted up and down by the telescopic cylinder 5 which is pivoted.

Reference numeral 8 denotes a plate-shaped vibrating cutting blade, the base end of which is connected to a vibrating body 9 and vibrated by the vibrating body 9.

10.11 is a telescopic cylinder for giving a stroke to the vibrating cutting blade 8, and is of a double piston type, and a vibrating body 9 is attached to the telescopic cylinder 10.

By actuating the telescopic cylinder 10.11, the vibrating cutting blade 8 is therefore stroked.

Although not shown in the figure, a water jet hole is provided at the tip of the vibrating cutting blade 8 to spray a water jet.

Others A indicate a part of the lower end portion of the well, and its size is 50 to 60 m in diameter, and the lower end surface is a tapered surface a so that it can be easily sunk into the ground.

B is the ground. Next, the operation of the excavator with the above-mentioned configuration will be explained.

The telescopic cylinder 5 is operated to align the inclination angle of the vibrating cutting blade 8 with the tapered surface a at the lower end of the well.

Next, the vibrating body 9 is activated, and the cutting blade 8 cuts the earth and sand directly under the lower end surface of the well A, and the telescopic cylinder 10
．． 11 to move the cutting blade 8 forward.

Further, the traveling body 1 is gradually moved to excavate.

At this time, a water jet is injected from an injection hole (not shown) provided at the tip of the cutting blade 8 depending on the soil quality, so that the excavation can be carried out efficiently.

The excavation thickness shall be appropriate depending on the situation.

In this case, instead of excavating continuously from one location, excavation is performed sequentially at intervals such as A, C, etc., as shown in FIG.

The bottom of the well will be excavated one by one until it sinks safely.

Afterwards, similar work will be carried out to lay the huge structure.

Although the above-mentioned embodiment uses one elevating arm bent into a dogleg shape, for example, two straight arms can be pivoted and connected to form a dogleg shape to make an elevating arm. It can also be used as an arm.

As explained above, the excavator of the present invention can efficiently excavate the lower end of a structure to a predetermined uniform thickness when laying a huge structure, and can safely and efficiently excavate a huge structure. Can be built.

In particular, since the excavator of the present invention uses a vibrating cutting blade, even relatively hard soil can be excavated efficiently.

In addition, the first telescoping cylinder controls the elevation angle of the elevating arm, and the second telescoping cylinder controls the position where the cutting blade protrudes from the elevating arm, so the cutting blade can be cut at an angle that matches the inclination angle of the lower end of the well. can be inserted deep along the bottom edge of the well.

Therefore, excavation work on the underside of this type of structure becomes extremely easy.

In addition, even hard soil can be sufficiently excavated by jetting water, so excavation work can be carried out regardless of the soil type.

[Brief explanation of the drawing]

Figure 1 is a plan view of the excavator of the present invention, Figure 2 is a side view of the same,
FIG. 3 is a plan view showing a mode in which earth and sand at the lower end of a huge structure is excavated using the excavator of the present invention. 1... Running body, 2... Rolling stand, 3...
... Elevation arm, 5.10.11 ... Telescopic cylinder, 8 ... Vibrating cutting blade, 9 ... Vibrating body.

Claims (1)

[Scope of utility model registration request] An excavator that excavates earth and sand directly below the lower end of a structure to a uniform thickness is equipped with a traveling body, a lifting arm is pivotally connected to the traveling body, and the base end is pivoted to the traveling body. It has a first telescoping cylinder which is attached to the vertical axis and whose piston tip is pivotally connected to the midpoint of the vertical arm, and the vertical arm is further provided with a second telescopic cylinder which strokes the vibrating body along the vertical arm. An excavator characterized in that a cutting blade is attached to the vibrating body, and a water injection hole for spraying a water jet is provided at the tip of the cutting blade.