JPS60326Y2 - Concrete layer joint cutting device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a joint cutting device for creating vertical joints in a concrete layer cast using RCD (roller compaction dam) concrete or the like.

When constructing concrete layers using RCD concrete, after each layer is exposed using a bulldozer, etc.
It is necessary to perform joint cutting work before or after compaction of the concrete layer using a vibrating roller, and to fill the joints with joint material to prevent cracks caused by shrinkage of the concrete.

However, it is possible to apply joint cutting techniques such as installing a guide device in a limited area as in conventional road concrete. Therefore, a joint cutting board is attached to the tip of the vehicle body, and this joint cutting technique can be applied. A joint cutting device in which the cutting plate is press-fitted into the concrete layer using a hydraulic jack while vibrating vertically has been proposed and put into practical use. However, the vibration of the joint cutting plate causes disturbances on the concrete surface, or separation of cement components, resulting in the disadvantage that highly accurate joint cutting work cannot be performed.

The present invention was devised to eliminate the above-mentioned drawbacks, and its purpose is to attach a protrusion at the center of the lower side of the boom, which is attached to the vehicle body so that it can move up and down and rotate horizontally. By attaching the joint cutting board to be horizontally rotatable and installing a striking device to apply a downward impact force to the joint cutting board, problems such as disturbance of the concrete surface and separation of cement components are avoided. It is an object of the present invention to provide a joint cutting device capable of creating joints with high precision.

The structure of the present invention will be described with reference to an embodiment shown in the drawings. 1 is equipped with a crawler 2 at the bottom and a swivel table 3 at the top.
The vehicle body 1 is equipped with an engine room 4 and a cab 5 mounted on the swivel base 3 of the vehicle body 1 so as to be horizontally rotatable. It forms the basic part of construction machinery.

The boom 6 is composed of a plurality of bendably connected arms 6a, 6b, and 6c, and by connecting each arm with a hydraulic cylinder 6', the boom 6 as a whole can be controlled to move up and down. I have to.

Reference numeral 7 denotes a striking device attached to the tip of the boom 6, which in this embodiment is composed of a hydraulic breaker.This striking device 7 is connected to a flat joint cutting plate 8 via a shaft 7' attached to the lower end. A downward impact force is applied to the

The joint cutting board 8 is horizontally rotatably attached to the striking device 7, and includes a bin 9 protruding from the upper surface of the joint cutting board 8 and a hydraulic vibration motor 10 attached to the tip of the boom 6. By engaging with the fork 11 of
A hydraulic vibration motor 10 controls the horizontal rotation of the joint cutting plate 8 about a shaft 7'.

Reference numeral 12 denotes a protrusion provided at the pivot center of the lower edge of the joint cutting plate 8, and the lower end thereof is formed into a sharp point for positioning.

Next, the operation of the present invention constructed as described above will be explained.

First, the concrete will be poured out using a bulldozer, etc., as in the past.

After the sprinkling is completed, the traveling vehicle body 1 is placed on the surface of the concrete layer before or after compaction of the concrete layer by the vibrating roller, and the boom 6 is adjusted to rotate and the joint cutting plate 8 is placed on the surface of the concrete layer.
is set on the concrete surface in alignment with the planned joint cut line 13.

Next, when the striking device 7 is activated to apply a downward striking force to the joint cutting board 8, the joint cutting board 8 is inserted into the concrete layer by this striking force.

When the joint cutting board 8 is inserted to a predetermined depth and then pulled out, a joint is created (see FIG. 3A).

After creating a joint with a length corresponding to the adjustment allowance for the boom 6 in this way, the traveling vehicle body 1 is moved and the joint cutting plate 8 is set again, but at this time, the center of the traveling vehicle body 1 is
As shown in FIG. B, it may deviate from the planned joint cutting line 13.

In this state, even if the protrusion 12 of the joint cutting board 8 is set on the planned joint cutting line 13, the horizontal rotation angle of the boom 6 will cause the joint cutting board 8 to be aligned with the planned joint cutting line 13, as shown in the figure. Since the angle θ is present, the precision of the joint is reduced.

Therefore, in such a case, when the tip of the protrusion 12 is positioned on the planned line 13 and the hydraulic vibration motor 10 is activated, the joint cutting plate 8 pivots around the tip of the protrusion 12 and cuts the joint. By rotating the plate 8 by the same angle in the opposite direction to the boom 6, the joint cutting board 8 can be aligned with the planned joint cutting line 13, as shown in FIG. It is possible to create high-precision joints along the line.

In the above embodiment, a conventionally known hydraulic breaker is used as the striking device 7, and a joint cutting plate 8 is set in place of the chisel of the breaker.
The configuration of is arbitrary.

Furthermore, the boom 6 does not necessarily have to be substantially extendable and retractable as in the embodiment, but may just be one that can be controlled in elevation and horizontal rotation.

In short, the present invention is such that a joint cutting plate having a protrusion at the center of the lower side is horizontally rotatably attached to the tip of a boom that is attached to the traveling vehicle body so that it can be raised and lowered and horizontally rotated. Since it is equipped with a striking device that applies downward striking force, it is possible to create joints without giving unnecessary vibration to the concrete.
Therefore, in order to prevent the disturbance of the concrete surface and the separation of cement components caused by the preparation of joints, the boom and the joint cutting board having a protruding part at the center of the lower side are attached so as to be horizontally rotatable. Therefore, even if the position of the traveling vehicle body shifts, by positioning the tip of the protruding part on the planned line and rotating it, the joint cutting plate can always be set accurately on the planned joint cutting line, and the joint will not be left in place. Accuracy can be increased,
Furthermore, since conventional breakers can be used as is for the traveling vehicle body, boom, and striking device, the joint cutting device can be easily and inexpensively manufactured, and the operating rate of the traveling vehicle body, etc. can be improved to reduce the total cost. It has extremely useful practical effects such as:

[Brief explanation of drawings]

The drawings show an embodiment of the concrete layer joint cutting device according to the present invention, and Fig. 1 is an overall side view, and Fig. 2 is an overall side view.
The figure is a front view of the main parts of the same as above, and Figures 3A, B, and C are schematic plan views of the same as in the construction state. In the figure, 1 is a traveling vehicle body, 6 is a boom, 7 is a striking device, 8 is a joint cutting board, 10 is a hydraulic vibration motor, and 12 is a protrusion.

Claims (1)

[Scope of utility model registration request] A joint cutting plate having a protruding portion at the center of the lower side is attached to the tip of a boom which is attached to the traveling vehicle body so that it can be horizontally rotated as well as going up and down, and the joint cutting plate has a downward impact force. A concrete layer joint cutting board device characterized by being provided with a striking device for applying.