JPH0349141Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to a crushing blade used in a construction machine that performs so-called pile cap processing, which is a process of destroying the head of a concrete pile to expose reinforcing bars for joining.

[Prior art and its problems]

There are various types of such pile head processing machines, such as a pinching type and a cutting type, but as an example, as shown in FIG. 52 is slidably supported toward the inner center of the frame, and a crushing blade 53 is attached to the tip of this hydraulic cylinder 52 (Japanese Patent Laid-Open No. 54-66505, Utility Model Laid-Open No. 54-74107). Publication No.).

According to this, as shown in FIG.
Since the surplus parts of the parts can be successively crushed while being surrounded by the support frame 51, the work can proceed safely and efficiently.

However, as shown in FIG.
A is shaped like an arc so as to match the outer periphery of the concrete pile P, and is pressed against the pile P by making line contact or surface contact. Therefore, the surface pressure applied to the pile P becomes small, and since it is a simple compression failure, the cylinder requires a large force.

The conventional crushing blade 53 has no horizontal wedge effect,
If there is a slight variation in the four blades, the balance will immediately be lost and large tensile stress will occur. Concrete, on the other hand, is strong in compression but weak in tension.

Compressive strength x 1/10 to 15 = tensile strength, but if the tensile stress exceeds the allowable value, vertical cracks will occur in the pile P and it will break in an unexpected way.

Furthermore, since the lower surface of the tip of the crushing blade 53 is cut off horizontally, the cutting edge tends to drag upward the reinforcing bars 54 exposed after the external concrete of the pile P is broken, easily causing bending or breakage.

[Purpose of invention]

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
External pressure is applied to the concrete pile as evenly and as dispersed as possible, without applying a large force to the hydraulic cylinder, and to prevent lopsided breaks. To provide a crushing blade for a pile head processing machine that does not cause damage due to dragging.

[Key points of the idea]

However, according to the present invention, the purpose of this lever is to install four pressing destruction devices with crushing blades attached to their tips in four directions (front, rear, left, and right) on the outside of the upper and lower through holes in the center of the fuselage frame, which is suspended horizontally using wire ropes, etc. This is achieved by providing a pile cap processing machine in which the crushing blade has a plurality of apexes arranged in a horizontal direction, and a tapered lower surface that is concave inward from the apex.

[Example of idea]

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 3 is a partially cutaway perspective view of the pile cap processing machine equipped with the crushing blade of the present invention, Fig. 4 is a partially cutaway plan view of the same, and Fig. 5 is a front view of the same. The body frame has a vertical through hole 2 in the center.

The fuselage frame 1 is located outside the through hole 2, and has four
In order to arrange a total of four press breaking devices 3 in the same direction, the storage protrusions 1a of the devices 3 are formed to protrude in four directions. The space between the adjacent housing protrusions 1a is largely gouged inward to secure a recess 4 there, and as a result, the overall shape of the frame 1 is made into a cross shape. 5 in the figure is a wire rope fixing hook attached to the upper surface of the storage protrusion 1a of the fuselage frame 1;
Reference numeral 6 designates a hydraulic equipment storage box similarly provided on the upper surface of the fuselage frame 1, and within the box 6, flow valves 7 and 8 and a check valve 9 are also stored.

The crushing device 3 is composed of a crushing blade 10 and a hydraulic cylinder 11 for sliding the crushing blade 10. As shown in FIG. 10a are arranged horizontally at intervals.

Further, the crushing blade 10 has a tapered lower surface 10b that is concave inward from the top portion 10a as shown in FIG.

This crushing blade 10 has flat crushing heads 15 arranged at a distance above it, and a holder 16.
The holder 16 is welded to the end face of the hydraulic cylinder 11 via the holder 16 and bolted to the end face of the hydraulic cylinder 11. The outer periphery of the hydraulic cylinder 11 is supported by a holder 12 with a collar and a bush interposed therebetween, and the end of the cylinder rod 11a facing outward is made circular and is received by a spherical seat 13 fixed to the fuselage frame 1 side. . In the figure, reference numeral 14 indicates a fixing pin that fixes the rod 11a and the seat 13 with some play.

Next, to explain the usage and operation, the 6th
As shown in the figure, the fuselage frame 1 is hoisted horizontally using a wire rope 17 or a string-like member such as a chain, and once suspended above a predetermined pile P, it is lowered as it is, and the head of the pile P is attached to the through hole. 2 from below.

In the figure, reference numeral 18 denotes a hose holder that supports a hydraulic hose 19, and the hydraulic hose 19 connects the hydraulic cylinder 11 to a hydraulic unit 20 having a fixed operation panel and a control panel via the equipment in the box 6. In this way, the rod 11 of the cylinder 11
When a is extended, the cylinder 11 and the crushing blade 10 move toward the center of the hole 2, the top part 10a bites into the concrete of the pile P, and the pile P is crushed by receiving pressing forces from four directions. By the way, the biting of the crushing blade 10 is divided into eight parts as shown by the ▲ marks in FIG. will be added. Therefore, it is less likely that cracks will be concentrated on one side.

Further, as shown in FIG. 2, the top 1 of the crushing blade 10
Since the lower surface 10b of Oa is formed in a tapered shape concave inward, this lower surface 10b does not directly contact the reinforcing bars 54.

When the top part 10a of the crushing blade 10 breaks the concrete and hits the reinforcing steel, the crushing blade 10 breaks the concrete and hits the reinforcing steel 5, since the fuselage frame 1 is suspended and is free to move upward. move upward along.

By displacing the point of action of the crushing blade 10 in this way and by making the contact of the crushing blade 10 with the reinforcing bars 54 a line contact, the reinforcing bars 54 are dragged by the crushing blade 10 and bent randomly or broken. There will be nothing to do.

[Effect of idea]

As mentioned above, the crushing blade of the pile cap processing machine of the present invention is designed to apply external pressure to the concrete pile as evenly and as dispersedly as possible, and the hydraulic cylinder requires only a small amount of force, while also preventing uneven fractures. In addition, there is no risk of damaging the exposed reinforcing steel by dragging it with the tip of the blade.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an embodiment of the crushing blade of the present invention, Fig. 2 is a longitudinal cross-sectional side view of the main parts of the same, and Fig. 3 is a partially cutaway view of a pile cap processing machine using the crushing blade of the present invention. A perspective view, Figure 4 is a partially cutaway plan view of the same as above, and Figure 5 is a partially cutaway plan view.
Figure 6 is a front view of the same as above, Figure 6 is a front view showing the state of use of the same as above, Figure 7 is a plan view of a conventional pile cap processing machine, Figure 8 is a front view of the same as above.
The figure is a front view showing the state in which the same as above is used, and FIG. 9 is a side view of the crushing blade portion. DESCRIPTION OF SYMBOLS 1... Airframe frame, 1a... Storage protrusion, 2... Through hole, 3... Pressing destruction device, 4... Recess, 5...
Hook, 6... Hydraulic equipment storage box, 7, 8...
...Diversion valve, 9...Check valve, 10...Crushing blade,
10a...Top part, 10b...Tapered bottom surface, 1
1...Hydraulic cylinder, 11a...Cylinder rod, 12...Cylinder holder, 13...Spherical catch, 14...Fixing pin, 15...Crushing head, 1
6...Holder, 17...Wire rope, 18
... Hose holder, 19 ... Hydraulic hose, 20
... Hydraulic unit, 51 ... Support frame, 52
...Hydraulic cylinder, 53...Crushing blade, 53a...
Tip surface, 54...Reinforcing bar.

Claims (1)

[Scope of utility model registration request] In a pile cap processing machine that is equipped with four pressing breaking devices with crushing blades attached to their tips in four directions (front, rear, left and right) outside the upper and lower through holes in the center of the machine frame, which is suspended horizontally with wire ropes, etc., the crushing blades are A crushing blade for a pile cap processing machine, characterized in that it has a plurality of tops arranged in a horizontal direction, and a tapered lower surface that is concave inward from the tops.