JPH11293699A - Stirring and digging device for the ground - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent local wear of a chain. SOLUTION: This stirring and digging device is provided with a base machine, a cutter post 12, a chain 14, and a digging bit 16. The chain 14 has a pin 14a and a link plate 14b. The cutter post 12 is arranged on an inner peripheral side of the chain 14 turning in an endless manner. The digging bit 16 is provided with a mounting plate 16a and a bit 16b which is provided and protrudes on the mounting plate 16a, and the mounting plate 16a is provided and fixed between the link plates 14b of the chain 14. A plurality of rotary rollers 26 are provided between the cutter post 12 and the chain 14. The rotary roller 26 is rotatably supported on a stepped part 12a provided on both ends and both side faces in the direction of width of the cutter post 12. Moreover, an upper end face of the rotary roller 26 comes into contact with and supports a lower end face of the link plate 14b of the chain 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground excavation device and, more particularly, to a chain. The present invention relates to an improved technique of a trencher-type stirring excavator.

[0002]

2. Description of the Related Art In a construction work for constructing a structure in a place where a ground is dug down, usually, an earth retaining wall is constructed to excavate the inside. Various methods of constructing such retaining walls have been proposed, and among them, a method of excavating in situ soil, mixing with a hardening material, and stirring is known.

[0003] As a ground stirring and excavating device used in such a construction method, for example, as disclosed in Japanese Patent Application Laid-Open No. Hei 7-34447, a chain having an excavating bit is attached endlessly to a cutter post. Let me go around
A chain that excavates in-situ soil by mixing and agitating with hardened material by circulating the chain. There is a trencher type in situ stirring excavator.

[0004] Such a chain. In the trencher type in situ stirring excavator, while circulating the chain,
A jack provided on the ground presses this against the ground, excavating and agitating the ground with a drill bit, and injecting a hardening material from inside the cutter post.

However, this type of chain. The trencher-type in-situ stirring excavator has the following technical problems.

[0006]

That is, in the above-described stirring and excavating apparatus, when the chain is pressed against the ground, the chain comes into contact with the smooth sliding surface of the cutter post and moves in a circulating manner.

[0007] A drill bit is mounted on the chain at every other position with respect to the chain link. However, in such a state, for example, when excavating hard ground, a large force is applied to the excavation bit due to the excavation resistance of the ground, and as a result, a large rotational moment acts on the chain link, and the cutter post slides. In terms of surface, the chain link is in local contact.

[0008] In such a contact state, the part that is in local contact wears more than the other part. If local wear occurs on the slide surface or the chain, the drill bit is scooped. There has been a problem that the angle is greatly changed, the excavation efficiency is reduced, and the chain is worn or broken.

SUMMARY OF THE INVENTION The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a ground stirring and excavating apparatus capable of preventing occurrence of local wear. is there.

[0010]

In order to achieve the above object, the present invention provides a cutter post supported on a base machine so as to be vertically movable, and a chain stretched around the cutter post so as to be capable of circulating and moving. And a drill bit fixed to the chain. In the trencher-type ground stirring and excavating apparatus, a plurality of rotating rollers rotatably supported by the cutter post are arranged along a circulating movement direction of the chain, and the chain is abutted and supported by the rotating roller. I made it. According to the ground stirring and excavating apparatus configured as described above, the chain circulates while abutting on the rotating roller, so that local wear of the cutter post and the chain can be prevented.
The rotating rollers may be arranged such that at least two of the rotating rollers always contact one link plate provided with the pins at both ends. According to this configuration, since at least two abut on one link plate, the link plate can be stably supported by the rotating roller.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 4 show an embodiment of a ground stirring and excavating apparatus according to the present invention.

The ground stirring and excavating apparatus shown in FIG. 1 includes a base machine 10, a cutter post 12, and a chain 14.
And a drill bit 16. Base machine 10
Has a telescopic arm 18, and a support frame 20 is attached to the telescopic arm 18.

On the front side of the support frame 20, a moving frame 22 is movably supported in the left-right direction, and the cutter post 12 is supported by the moving frame 22 so as to be vertically movable. The moving frame 22 is pressed by the jack 23 toward the ground to be excavated.

The chain 14 is stretched around the cutter post 12 in an endless manner so as to be capable of circulating and moving.
Details of the state of attachment of the chain 14 to the cutter post 12 are shown in FIGS. As shown in FIG. 3, the chain 14 has a pin 14a and a link plate 14b.

The chain 14 has a pair of link plates 14b opposed to both ends of the pins 14a, and the pins 14a penetrate through both end portions of the two linked link plates 14b such that both ends in the longitudinal direction overlap each other. Are arranged as follows.

The pin 14a is provided with two link plates 14
b through the bushing 14c.
B is locked on the outer surface. The cutter post 12
It is arranged on the inner peripheral side of the chain 14 that goes around endlessly, and is appropriately extended by interconnecting those having the same structure.

At both ends of the cutter post 12, a pair of sprocket wheels 24 meshing with the chain 14 and circulating the chain 14 are arranged. In addition, inside the cutter post 12, an injection passage (not shown) for injecting the curing material is provided.

The drill bit 16 includes a mounting plate 16a.
And a bit 16b protruding from the mounting plate 16a.
The mounting plate 16a is fixed between the link plates 14b of the chain 14.

The arrangement of the drill bit 16 is determined by the chain 1
The fourth link plate 14b is provided for every other link plate 14b.

The above chain. The basic configuration of a trencher-type stirring and excavating apparatus is the same as that of a conventional stirring and excavating apparatus of this type. However, the stirring and excavating apparatus of the present embodiment has remarkable features in the points described below.

That is, in the stirring and excavating apparatus of this embodiment,
A plurality of rotating rollers 26 are interposed between the cutter post 12 and the chain 14. The rotating rollers 26 are adjacently arranged at predetermined intervals along the moving direction of the chain 14.

The interposition range of the rotary roller 26 is within a range where the chain 14 is parallel to the side surface of the cutter post 12, as shown in FIG.

In the case of this embodiment, the rotating roller 26 is
As shown in FIG. 3, the mutual position interval is set so that two link plates 14b are always in contact with one link plate 14b.

It is to be noted that the number of the rotating rollers 26 can be set not only so that two rollers always contact one link plate 14b but also the number thereof according to the length of the link plate 14b. Yes, three or more may always be in contact.

As shown in FIG. 4, each rotating roller 26
The cutter post 12 is rotatably supported by four stepped portions 12a provided at both corners on both ends and both side surfaces in the width direction.

The upper end surface of the rotating roller 26 is configured to contact and support the lower end surface of the link plate 14b of the chain 14. Both end edges in the width direction of the cutter post 12 are separated from the lower surface of the pin 14 a of the chain 14.

In the stirring and excavating apparatus constructed as described above, as shown in FIG. 1, while the chain 14 penetrates into the ground together with the cutter post 12, the jack 23 presses the excavating bit 16 against the ground, Chain 1
By circulating the 4, the excavation bit 16 agitates while excavating the ground.

Simultaneously with this operation, a hardening material is injected from the inside of the cutter post 12, and the hardening material and the excavated earth are mixed and stirred to form a hardened body in the ground. At this time, in the stirring and excavating apparatus of this embodiment, the chain 14
6 while abutting on the chain post 6, even when a large rotational moment is applied to the chain link when excavating hard ground, the cutter post 12 and the chain
Can prevent local wear.

In the case of this embodiment, the rotating roller 2
6 is arranged such that at least two are always in contact with one link plate 14b of the chain 14,
The link plate 14b can be stably supported by the rotating roller 26.

[0030]

As described above in detail in the embodiments,
ADVANTAGE OF THE INVENTION According to the ground stirring and excavating apparatus of the present invention, since local wear of both the chain and the cutter post is prevented, there is no shift in the rake angle of the excavating bit, and a decrease in excavating efficiency can be avoided. it can.

[Brief description of the drawings]

FIG. 1 is a front view and a side view of a construction state of a ground stirring and excavating apparatus according to the present invention.

FIG. 2 is a front view of the stirring and excavating apparatus of FIG. 1 in a state where a chain is attached.

FIG. 3 is an enlarged view of a main part of FIG. 2;

FIG. 4 is a sectional view taken along line AA of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Base machine 12 Cutter post 14 Chain 14a Pin 14b Link plate 16 Drilling bit 18 Telescopic arm 26 Rotary roller

Claims (2)

[Claims] 1. A chain comprising: a cutter post supported by a base machine so as to be movable up and down; a chain stretched around the outer circumference of the cutter post so as to be capable of circulating; and a drill bit fixed to the chain. . In the stirring and excavating apparatus for a trencher-type ground, a plurality of rotating rollers rotatably supported by the cutter post are arranged along a circulating movement direction of the chain, and the chain is abutted and supported by the rotating roller. An agitating and excavating device for ground, characterized in that: 2. The ground stirring and excavating apparatus according to claim 1, wherein at least two of said rotating rollers are always in contact with one link plate provided with said pins at both ends. .