JPH01214670A - Attachment for reinforced concrete crushing and shearing - Google Patents

Abstract

PURPOSE:To make a span of service life longer in reducing the extent of wear in a blade by forming the shearing blade so as to cause an angle made by each reinforcement shearing blade formed in two jaws to become smaller than that made by each concrete crushing surface of both these jaws. CONSTITUTION:An attachment, bearing above caption, is constituted of a main jaw 2 and a sub-jaw 3 rockably attached to this main jaw 2, and each of reinforcement shearing blades 6a, 6b is formed in the respective bases. In addition, an angle alpha made by these blades 6a, 6b is constituted to be smaller than angle betamade by concrete crushing surfaces 2a, 3a of these jaws 2, 3. In the state that these jaws 2, 3 are opened, they bite into a concrete wall, crushing concrete into pieces, and at the time of shearing, the exposed reinforcement is sheared by the blades 6a, 6b without crushing the concrete. Consequently, any waste of energy consumption is eliminated, and war in these blades 6a, 6b is reduced so that durability is thus improvable.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an attachment to be attached to a construction machine,
In particular, it relates to attachments used for crushing concrete structures and shearing reinforcing bars.

[Conventional technology]

When demolishing and removing a concrete building or structure during rebuilding, etc., it is attached to a construction machine and operated from the construction machine to crush the concrete wall and shear the exposed reinforcing steel. Attachments are often used.

FIG. 6 shows an example of a conventional attachment for crushing concrete and shearing reinforcing steel.

This attachment 50 is configured so that it can be connected, for example, to an arm of a construction machine to which a packet for scooping gravel or the like is attached, in place of the packet. For example, when destroying and removing a concrete wall made of reinforced concrete structure, the hydraulic cylinder 52 is operated by the construction machine.
The upper jaw 51 and the auxiliary jaw 53 are engaged with each other in the y direction around the pin 54, so that the concrete wall 5
It is designed to crush 6.

[Problem that the invention seeks to solve]

In the configuration shown above, when the jaws 51 and 53 are engaged once, most of the concrete is crushed and removed, exposing the reinforcing steel inside. This reinforcing bar is sheared by shearing blades 55a and 55b formed at the bases of both jaws 51 and 53. In other words, the concrete wall 56 is connected to the concrete wall 56 for a length corresponding to approximately the entire length of each jaw portion 51.
of concrete will be crushed and removed. Next, the exposed reinforcing bars are sheared using shearing blades 55a and 55b. - times of shearing, the reinforcing bars are sheared only by a length corresponding to the width W of the blade, so instead of swinging both jaws in the x and y directions, they are lowered by a distance equal to the width W and the shearing work is performed sequentially. In this case, there are the following problems.

- In order to shear the exposed reinforcing steel with a length approximately equal to the length L of the jaws due to the engagement of the two jaws, first, the attachment body 50 with both jaws open is moved by a distance approximately equal to the width W of the shearing blade. The blade is lowered in the D direction, and with the exposed reinforcing bar held in the blade, both jaws are closed, thereby shearing the reinforcing bar. In this case, by lowering the entire attachment 50 by W, the tips of both jaws are attached to the concrete wall 56.
Of these, the parts where the concrete has not been crushed will be chewed. Therefore, the concrete will be crushed at the same time as the reinforcing bars are sheared.

Here, the concrete is crushed at the tip of each jaw 51, 53 because the distance from the pin 54 is long, and therefore the moment arm at the time of engagement is long, so some of the concrete is crushed at the tip of the jaw. However, it requires a large amount of energy to crush. In the work of shearing reinforcing bars by successively descending the distance corresponding to the width W of the shearing blade, the concrete is broken at the tip of the jaw each time, so the shearing work as a whole requires a large amount of energy and is uneconomical. be. In addition, a mechanism is also envisaged in which the formation width W of the shearing blade is made large, and in the most extreme case, the shearing blade is formed over the entire length of the jaw, thereby simultaneously shearing the reinforcing bars at the same time as crushing the concrete. However, with this configuration, in addition to crushing the concrete, it is necessary to shear all the exposed reinforcing bars at once, which requires an extremely large amount of energy. For this reason, the hydraulic pressure transmitted from the construction machine alone is completely insufficient in energy, making it virtually impossible to operate. Furthermore, even if it is possible to supply energy to operate the attachment, the attachment maintains its strength, resulting in a large size and heavy weight, which ultimately impairs workability. Furthermore, there are various problems such as the shearing blades coming into direct contact with the concrete during concrete crushing, and the shearing blades becoming worn out in a short period of time and becoming unusable, so this method is not a practical solution. I don't get it.

[Means for solving problems]

The present invention has been constructed in order to eliminate the above-mentioned problems, and has a structure in which the conventionally configured attachment is directly connected to the rebar shearing blade on the forming surface of the concrete crushing jaw. In other words, the problem is caused by the fact that the opening angle of the jaw and the opening angle of the shearing blade are the same. This is an attachment for crushing and shearing reinforced cocrete walls with a diameter smaller than the opening angle of the jaw.

[Effect]

Since the opening angle of the shearing blades formed on both jaws of the attachment body is smaller than the opening angle of these jaws, a single engagement of both jaws will cover a distance equivalent to the length of these jaws. When shearing exposed reinforcing bars, the tips of both jaws are opened a considerable distance apart, so concrete is hardly crushed when shearing reinforcing bars, reducing wasteful energy consumption.

〔Example〕

An embodiment of the present invention will be specifically described below with reference to the drawings.

In FIGS. 1 and 2, arrow 1 indicates the main body of the reinforced concrete crushing and shearing attachment.

2 is an upper jaw, 3 is a subsidiary jaw which is swingably attached to the upper jaw 2 via a pin 4, and both jaws 2 and 3 are brought into engagement and opened by the operation of a hydraulic cylinder 5. It is composed. 6a and 6b are reinforcing bar shearing blades formed at the bases of the main jaw 2 and the subjaw 3. Forming surfaces of these teeth 6a and 6b and concrete crushing surfaces 2a and 3a of each term
The angle α formed by these blades 6a and 6b when the attachment is activated is smaller than the angle β formed by the concrete crushing surfaces 2a and 3a. In the illustrated structure, in addition to shearing blades 6a and 6b formed in the longitudinal direction of each section 2 and 3, inner blades 7a and 7b are also provided perpendicularly to the shearing blades 6a and 6b.

The attachment main body 1 having the above structure is attached to the arm 8 of a construction machine or the like and crushes and shears cochlear structures.

3 to 5 show the operating state of the attachment described above.

First, with both jaws 2 and 3 of the attachment body 1 open, the attachment body 1 is placed against the reinforced concrete wall 56.
Place it so that it bites. In this state, both jaws are interlocked until the concrete crushing surfaces 2a and 3a of both jaws are almost parallel (see Fig. 4). In this way, the concrete is crushed by the repeated engagement of the jaws, and when the jaws are opened, the crushed concrete falls, exposing the reinforcing bars 10 as shown in FIG. In addition, if the reinforcing bars are not exposed after the two engagements, repeat the engagement several times to expose the reinforcing bars.

Next, when the reinforcing bars are exposed, the attachment body 1 is lowered by a distance W1 corresponding to the shearing blades 6a and 6b, and the exposed reinforcing bars are sheared. In this case, each month 6a and 6b
The angle formed by the jaw is smaller than the angle formed by both jaws, so
Even when the moons are engaged, the jaws 2 and 3 are separated by a considerable distance, so the movement of both jaws in the X and Y directions when shearing the reinforcing steel is slight, and when the reinforcing steel is shearing, the jaws 2 and 3 are separated by a considerable distance. It is possible to almost prevent the tip of the section from crushing the concrete. Therefore, exposed reinforcing bars 10 (see Figure 5)
When shearing, repeat rocking with a small rocking angle and
By lowering the attachment body 1 in the direction of
Only shearing of reinforcing bars can be performed.

Next, when shearing of the exposed reinforcing bars is completed, the concrete is crushed by almost completely interlocking the two jaws again as shown in FIG. 4, and the reinforcing bars are sequentially sheared in the same manner as described above.

In the case of the above operation, if the inner cutters 7a and 71b are provided in each section, as shown in FIG. 2, reinforcing bars 10 arranged in different directions can be sheared at once. Incidentally, in the case of an attachment that does not have an inner cutter, shearing is performed by operating the arm of the construction machine to tilt the attachment relative to the reinforcing steel.

〔effect〕

Since the opening angle of the shearing blades formed on both jaws of the attachment body is smaller than the opening angle of these jaws, a single engagement of both jaws exposes a distance equivalent to the length of these jaws. When shearing reinforced reinforcing bars, the ends of both jaws are opened a considerable distance apart, so the concrete in the concrete wall is hardly crushed during shearing, and wasteful energy consumption can be suppressed.

Further, since the shearing blade hardly comes into direct contact with concrete during concrete crushing, wear of the blade can be significantly reduced, and the life of the attachment can be maintained for a long time.

[Brief explanation of the drawing]

Figure 1 shows an example of the reinforced concrete crushing system of the present invention.
A side view of the shearing attachment, No. 20 is A- in Fig. 1.
A sectional view taken along line A, and Figures 3 to 4 are side views of the attachment shown in Figure 1, showing the operating state of the attachment. FIG. 5 shows a crushed state, FIG. 5 shows a state where exposed reinforcing bars are sheared, and FIG. 6 shows a side view of an attachment having a conventional configuration. 1... Attachment body 2... Main item 2a13a... Concrete crushing surface 6a, 6b... Reinforcement shearing blades 7a, 7b... Inner cutter 10... Rebar 56... Concrete wall α・・・Angle β formed by the reinforcing bar shearing blade ・・Angle formed by the concrete crushing surface

Claims (2)

[Claims] (1) In a device that crushes concrete and shears reinforcing bars in reinforced concrete structures by meshing two jaws with shearing blades formed at their bases, if both jaws open at a predetermined angle, An attachment for crushing and shearing reinforced concrete, characterized in that the shearing blade is formed so that the angle formed by the shearing blade is smaller than the angle formed by the concrete crushing surfaces of both jaws. (2) Claim (1) characterized in that each jaw is provided with an inner cutter so as to be substantially perpendicular to the shearing blade.
Attachments for crushing and shearing reinforced concrete as described in Section 1.