JPH0213538Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention relates to an improvement of an attachment for forming a culvert in soil, which is equipped on an earthmoving vehicle such as a bulldozer.

[Conventional technology]

For example, when developing land at the foot of a mountain, if the cultivated land has multiviscous muddy soil or wetland soil, a drainage culvert is installed in the soil in order to improve the soil. It is well known that trenchers and rift yanks equipped with bulldozers are used to accomplish this task. However, in the case of a trencher, it is a machine exclusively used for digging trenches for burying drainage pipes for underdrains, and it is impossible to form an underdrain only by digging trenches. For this reason, the pipe cannot be formed unless the pipe is laid in the excavated trench and then backfilled with earth and sand, and the work required to form the culvert becomes extensive and costs a huge amount of money. It was hot. On the other hand, in the case of a rift yank, the purpose is to form a drainage ditch by ripping alone, and as with the trencher, it is impossible to form a culvert with the rift yank itself. In particular, it is extremely difficult to form drainage ditches in soft soil by just ripping, and for this reason, the reality is that the drainage efficiency of soft soil cannot be improved and the soil cannot be improved. . In addition, for example, in the trench-forming device for a culvert-type drainage ditch disclosed in Utility Model Application No. 53-104037, a horizontal shaft body is provided at the tip of the trench-forming device mounting plate, and a hollow bullet body is connected to the rear end. A configuration is disclosed in which a screw rod is passed through the hollow of the cylinder and screwed to the shaft. However, with the above configuration, the bullet body needs to be formed hollow, and sufficient strength cannot be obtained.In addition, since the screw rod is screwed in the front and back direction, stress is applied to the screwed part when excavating the culvert, and furthermore, the bullet body is When lifting the body above the ground, there is a drawback that the load is applied in the direction perpendicular to the screw.

[Problem that the invention attempts to solve]

This idea was devised in view of the above circumstances, and its main challenges were to make the underdrain forming body replaceable, but also to prevent load from being applied to the screwed part when excavating the underdrain or pulling it up to the ground, and to increase the strength. An object of the present invention is to provide an attachment for forming an elevated underdrain.

[Means to solve the problem]

In order to solve the above-mentioned problems, this invention is an attachment for forming an underdrain in which a underdrain forming body is attached to the tip of a shank that is mounted on an earthmoving vehicle and extends downward. (b) the underdrain forming body has a generally bullet-shaped body with a circular cross-section and a pointed front end; (d) a side that communicates with the bottom of the mounting groove and extends in the diametrical direction and faces the mounting groove; (e) Insert bolts from the bottom side of the underdrain forming body to removably fasten the underdrain forming body and shank. We are taking technical measures to do so.

[Effect]

When the tip of the shank is inserted into the mounting groove of the approximately bullet-shaped underdrain forming body, the front end side of the shank abuts within the mounting groove and is fitted without any gap. Further, the shank side bolt hole fitted in the mounting groove and the underdrain forming body side bolt hole are aligned, and the bolt is inserted into the hole from the bottom side of the underdrain forming body, and the underdrain forming body is fastened to the shank and removably connected.

【Example】

Preferred embodiments of this invention will be described below with reference to the drawings. In FIG. 3, A is a bulldozer (hereinafter referred to as a dozer) exemplified as an earthmoving vehicle, and the rear of the dozer A is equipped with a ripper device B. Using the shank holder C of this ripper device B, the attachment 1 of this invention is attached. This attachment 1 includes a shank 2 whose upper end side is fitted into and aligned with the shank holder C so as to be freely insertable and removable, and which is engaged and held by a lock pin P, and a shank 2 for forming an underdrain which is fastened and fixed to the lower end of the shank 2. It consists of 3. In more detail based on Figures 1 and 2, the shank 2 is made of 80Kg/mm ^2nd grade high-tensile steel plate, and its lower part is gently curved toward the front in a roughly J-shape. A double-edged cutting edge portion 20 is formed at the front end edge. This cutting edge portion 20 is provided to improve excavation performance when forming an underdrain, which will be described later. Further, the lower end side of the shank 2 is formed as an underdrain forming body attachment piece part 21, and the attachment piece part 21 has a vertical front end side 21a, a bottom side 21b perpendicular to the side, and a shank side bolt hole 21c opened in the bottom side. It has On the other hand, the underdrain forming body 3 has a conical shape on the front end side and is made of hardened high chromium steel.
0 is the underdrain forming body attachment piece portion 21 of the shank 2.
A mounting groove 31 is formed for fitting and alignment. Furthermore, when the mounting groove 31 is fitted into and aligned with the underdrain forming body mounting piece 21, the underdrain forming body 3 has a bolt hole 32 that inevitably matches and communicates with the shank side bolt hole 21c of the mounting piece 21. The lower opening of the bolt hole 32 has a bolt 4 for fastening the underdrain forming body.
A counterbore 32a is formed for housing the head 40 of the head. In this way, the underdrain forming body 3 is inserted into the shank side bolt hole 21c with the mounting groove 31 fitted and aligned with the underdrain forming body mounting piece portion 21 of the shank 2 as described above.
and the bolt 4 through the underdrain forming body side bolt hole 32.
It is fastened and fixed in a replaceable manner. The required number of attachments 1 constructed as described above are attached and held in the shank holder C of the dozer A for use. In this case, as shown in FIG. 3, a preparatory hole 6 for forming an underdrain is previously provided in the clayey soil 5, and the dozer A is moved to position the attachment 1 directly above this hole. Next, the existing reaper hydraulic system of the dozer A is controlled to lower the underdrain forming body 3 of the attachment 1 to a predetermined depth position within the preparation hole 6. Therefore, when the dozer A is run, the attachment 1 is pulled and the front end cutting edge 20 of the shank 2 of the attachment forms a vertically long incision groove 50 in the soil 5, and at the same time, the inside of the soil 5 is cut. As the underdrain forming body 3 is propelled, an underdrain 51 having a hole diameter corresponding to the outer diameter of the circumferential body portion 30 of the underdrain forming body 3 is formed. Therefore, the same number of underdrains 51 as the number of attachments 1 installed on the shank holder C can be formed at the same time. In the above embodiments, the underdrain forming body 3 is only fastened with two bolts 4;
It can be easily replaced with another pre-prepared underdrain forming body having a different outer diameter. For this reason, by preparing in advance a plurality of types of underdrain forming bodies with different diameters and selecting the underdrain forming body with a desired diameter from among them and replacing it with the shank 2, the underdrain 51 with the pore diameter corresponding to the quality of the soil 5 can be formed. can be easily formed. Further, the underdrain forming body 3 is shown in FIG. 5 or 6.
As shown in the figure, fins 30a extending radially outward may be integrally formed on the circumferential trunk portion 30. According to the underdrain forming body 30 with the fins 30a, as shown in FIG. 7 or 8, the branch water guide groove 51 has a shape corresponding to the cross section of the fin 30a.
A or 51b can be easily formed.

[Effect of the idea]

As described above, according to this invention, when the underdrain forming body is attached to the shank in a replaceable manner, the stress applied during excavation can be received by the front end of the shank that fits into and abuts the mounting groove of the underdrain forming body. It will not affect the parts. Further, when the underdrain forming body is pulled up to the ground, the direction is the same as the fixed bolt, so there is no risk of applying excessive force. Furthermore, there is no need to form the underdrain forming body hollow,
Since the tip of the shank is fitted into the attachment groove to form a solid shape, the strength of the underdrain forming body can be further increased. By equipping an earthmoving vehicle with the underdrain formation attachment formed in this manner and driving the vehicle, the underdrain forming body at the lower end of the attachment is propelled through soil such as clay. A culvert corresponding to the cross-sectional shape of the formed body is immediately formed, and the culvert formation work can be easily and efficiently carried out only by driving an earthmoving vehicle, and the cost required for this work in vast cultivated areas is greatly reduced. be able to. Moreover, since the underdrain forming body is removably fastened to the shank, it can be easily replaced with another underdrain forming body with a different diameter. You can select and set it as you like.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of an attachment according to a preferred embodiment of this invention, Fig. 2 is a sectional view taken along the line - - of Fig. 1, and Fig. 3 is a culvert formed by equipping a bulldozer with the attachment. FIG. 4 is a sectional view taken along the line - in FIG. 3, FIGS. 5 and 6 are perspective views showing different culvert forming bodies, and FIGS. FIG. 7 is a cross-sectional view of a culvert formed by the culvert forming body of FIG. 6; 1...Attachment, 2...Shank, 3...
...Culvert forming body, A... Earthmoving vehicle, C... Shank holder.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In an attachment for forming a culvert in which a culvert forming body is attached to the tip of a shank that is attached to an earthmoving vehicle and extends downward, the shank has an opening at its tip surface and extends in the height direction. In addition to forming a bolt hole on the shank side, the underdrain forming body has a generally bullet-shaped body with a circular cross-section and a pointed front end, opens along the front and back of the body, and is recessed in the diametrical direction to form a shank side bolt hole. A mounting groove is formed that abuts the front end side of the shank and is fitted without a gap, and communicates with the bottom of the mounting groove, extends in the diametrical direction, and is open on the side facing the mounting groove, so that when the shank is installed, it is connected to the shank side bolt hole. An attachment for forming an underdrain, characterized in that a bolt hole on the side of the underdrain forming body is provided that can be matched, and a bolt is inserted from the bottom side of the underdrain forming body to removably connect the underdrain forming body and the shank. (2) Claim 1 of the utility model registration claim, characterized in that the portion opening into the bottom surface of the underdrain forming body at the lower end of the bolt hole on the underdrain forming body side is formed as a counterbore portion that accommodates the head of the bolt. Attachment for forming a culvert as described. (3) The attachment for forming an underdrain according to claim 1, wherein a fin extending radially outward is integrally formed on the circumferential body of the underdrain forming body. (4) The attachment for forming an underdrain according to claim 1, wherein a cutting edge is formed on the front edge of the shank.