JP2002129864A - Scraper device for scraping earth and sand on inner wall of casing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scraper device capable of effectively and safely scraping off earth and sand clinging to the wide diameter portion of a casing. SOLUTION: The scraper device for scraping earth and sand off the inner wall of a casing should be mounted at the end of an operating arm as it is pointed in a radial direction inside the casing which should be subjected to the operation of scraping earth and sand off. Scraper blades pointed in their extending direction are provided to protrude from both ends of an expansion sleeve which is free to expand and contract longitudinally. A fluid pressure cylinder for causing expansion and contraction of the sleeve is mounted within the sleeve.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scraper device for scraping off sediment adhered to the inner wall of a casing for manholes to be built underground in sewerage works and other types of casings to be built in grounds for various facility works. About.

[0002]

2. Description of the Related Art Conventionally, for example, in the construction of RC casings (reinforced concrete casings) for manholes,
Using a casing rotating press-in device, the casing is rotated and the casing is press-fitted for a fixed length, and the sediment in the casing is discharged using a clamshell bucket into the bucket. The method of scraping and discharging to the outside of the casing is adopted.

[0003] However, it is not easy to sufficiently remove the earth and sand adhering to the inner wall surface of the casing by the clamshell bucket. Particularly, the RC casing for manhole is provided at the lower end of the thick casing with a steel cylinder thinner than the casing. With the cutting edge formed by forming an excavating blade at the lower end edge of the body, the inner diameter of the cutting edge portion is wider than the inner diameter of the casing, so with the clamshell bucket, It is almost impossible to remove sediment attached to the inner wall.

Therefore, conventionally, a worker enters the casing and scrapes off the attached soil by hand using a scoop or the like. However, not only the work efficiency is poor, but also safety problems remain. Was.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to a scraper capable of efficiently and safely scraping off not only earth and sand adhering to the inner wall surface of a casing but also a continuous portion having a larger diameter than that of the casing. It is an object to provide a device.

[0006]

As a means for achieving the above object, the present invention relates to a scraper device to be attached to a tip of an operation arm in a state of being directed in a diametrical direction in a casing to be scraped. An inner wall of a casing in which scraper blades are respectively protruded toward both ends of a telescopic sleeve which is telescopically extendable in the longitudinal direction and a fluid pressure cylinder for expanding and contracting the telescopic sleeve is provided in the telescopic sleeve. A scraper device for scraping is proposed.

In the present invention, the "operation arm" may be a clamshell bucket, an arm of various other civil engineering machines which is replaced with a scraper device, or a specially designed scraper device. In addition, those arms are appropriately selected depending on the use, such as one that is extended and retracted or moved up and down by a driving device, one that is rotated, and one that is rotated together with extended and retracted or up and down movement. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0008]

FIG. 1 shows an example in which a telescopic arm to which a clamshell bucket is attached is used as an operating arm (A), and a scraper device (1) is used in place of the operating arm (A). The structure is as follows. In FIGS. 2 and 3, a double sleeve type telescopic unit is inserted into both ends of a main sleeve (2) open at both ends so as to be freely slidable from the open ends. A sleeve (4) is formed, and rubber plate-shaped scraper blades (5) made of rubber in this example are provided at both ends of the elastic sleeve (4).
(5) is fixed by set screws (6) and (6), respectively. When the scraper device (1) is connected to the operation arm (A) and positioned in the diametrical direction in the casing, the scraper blades (5) and (5) face the blade surface in parallel with the longitudinal direction of the casing. In this state, the blade tip is fixed so as to protrude in the direction in which the telescopic sleeve (4) extends.

(7) and (7) are guide grooves in the generatrix direction provided in both halves from the middle of the main sleeve (2).
(8) and (8) are slide pins that engage with the guide grooves (7) and (7) protruding near the inner end of the outer peripheral surface of the sub sleeves (3) and (3). 3) and (3) the sliding range is regulated and the rotation is stopped.

A hydraulic cylinder (9) is inserted into the expansion sleeve (4) as a means for driving the expansion and contraction of the expansion sleeve (4), and the base end of the hydraulic cylinder (9) is connected to the pin (1).
0), the tip of the piston rod (11) is connected to the inside of the outer end of the other sub-sleeve (3) by a pin (12).

(13) A pin hole (14) of two triangular plates projecting from the outer surface of the middle part of the main sleeve (2).
The bracket (13) is detachably connected to the eye plate (a) at the tip of the operation arm (A) by inserting and removing a pin. (15) and (15) are stoppers fixed to the bracket (13), which prevent rotation of the bracket (13) pin-connected to the eye plate (a) of the operation arm (A), and provide a scraper device. (1) is held at right angles to the operation arm (A).

The operation of the above example will be described below together with the operation.
The scraper device (1) connected to the operation arm (A)
As shown in FIG. 1 by a chain line, it is inserted into the manhole RC casing (C) pressed into the ground by the casing rotary press-fitting device, where the telescopic sleeve (4) is first extended by the extension drive of the hydraulic cylinder (9). The scraper blades (5), (5) at both ends are brought into contact with the inner wall surface of the casing (C),
In this state, the casing (C) is rotated by the rotary press-fitting device, and the scraper device (1) is moved up and down by expansion and contraction of the operation arm (A), whereby the casing (C) is moved by the scraper blades (5) and (5). ) Scraping residual earth and sand on the inner wall.

Next, the scraper device (1) is connected to the blade (E).
, And the hydraulic cylinder (9) is further extended and driven so that the scraper blade (5),
(5) The sediment layer (S) adhering to the inner wall surface of the cutting edge (E)
The casing (C) is rotated in the same manner as described above, and the scraper device (1) is moved up and down, whereby the scraper blade (5), In (5), the earth and sand layer (S) is scraped off.

After the scraping operation, the telescopic sleeve (4) is reduced by the reduction drive of the hydraulic cylinder (9), and then the scraper device (1) is pulled up from the casing (C).

[0015]

According to the scraper device for scraping off the soil on the inner wall of the casing according to the present invention, not only the earth and sand remaining on the inner wall of the casing but also the earth and sand adhering to a wide-diameter portion such as a blade port in the RC casing for manholes. By extending the telescopic sleeve by driving the fluid pressure cylinder and bringing the scraper blade into contact with the casing and the inner wall surface of the wide-diameter portion, the scraper blade can be reliably scraped off, improving work efficiency and improving safety. It is possible to achieve the securing of the nature.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a state in which a scraper device according to the present invention is inserted into an RC casing.

FIG. 2 is an enlarged vertical sectional front view of the scraper device.

FIG. 3 is an enlarged vertical cross-sectional plan view of a tip portion of the scraper device.

[Explanation of symbols]

 C RC casing for manhole A Operation arm 1 Scraper device 4 Telescopic sleeve 5 Scraper blade 9 Hydraulic cylinder

Claims (1)

[Claims] 1. A scraper device to be attached to a tip of an operation arm in a state where the scraper blade is directed in a diametrical direction in a casing to be subjected to earth and sand scraping work. A scraper device for scraping off the inner wall of a casing, wherein a fluid pressure cylinder for expanding and contracting the telescopic sleeve is provided inside the telescopic sleeve.