Excavating – Ditcher – Having endless digger
Patent
1999-06-03
2000-12-05
Will, Thomas B.
Excavating
Ditcher
Having endless digger
405154, 305 60, 305191, E02F 504, E02F 510, B62D 5508
Patent
active
061549886
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to build machines for overhauling, more specifically replacement of the insulating coating of the main oil and gas pipelines or pipelines for other applications, namely to machines for digging under pipelines of a broad range, mostly of large diameters for the height sufficient for the pipeline repair in the trench, without its lifting. The invention also relates to the caterpillar travelling units preferably for movement over pipelines or other extended bodies of a round, elliptical, oval, or other convexo-curvilinear cross-sectional shape.
BACKGROUND ART
Known is a machine for digging under pipelines, containing symmetrically located end effectors made in the form of rotary posts with the driven spiral mills with the right-hand direction of blade turn for the mill located on the left side in the direction of the machine movement and left-hand direction for the right mill, and the breast located behind the spiral mills (USSR Auth. Cert. #1263765, cl. E02F 5/06, 1986). However, in view of the fact that the breast is made common for both end effectors and fastened on their posts, the self-digging of the machine under the pipeline is impossible. As the posts rotate around the horizontal longitudinal axes with the spiral mills moved out from under the pipeline, the posts do not fall within the trench clearance limits, thus requiring digging of the latter using additional mechanisms or manually. Besides, with the mentioned direction of the blade turns the mills rotation proceeds in such a way, that the upper blades are moving in the direction opposite to that of the machine movement, which results in the soil throwing over the breast with the increase of the mills rotation speed.
Known is a machine for pipeline digging, incorporating posts with the driven spiral mills mounted on telescopic shafts (USSR Auth. Cert. # 1198166, cl. E02F 5/02, 1985). However, the design of the telescopic shaft, of the drive for its extension and assembly of its mounting on the post, is complex, unreliable, not capable of standing high loads and with a large diameter of the pipeline, cannot practically fall within clearance limits of the post. Besides, the absence of breasts lowers the effectiveness and performance of the spiral mills.
Known is a machine for digging under the pipeline which incorporates the frame, symmetrically located end effectors made in the form of posts placed on both sides of the pipeline and mounted on a frame with the capability of forced rotation around the horizontal longitudinal axes, and driven rotors mounted on the lower ends of the posts by means of vertical shafts located on both sides of the pipeline, and mounted on the frame travelling unit of the stepping type (USSR Auth. Cert. # 24882, cl. E02F 5/08, 1976). In view of the large dimensions of the rotors and of the posts rotation around the horizontal longitudinal axes with the rotors moved out from under the pipeline, they do not fall within clearance limits of the trench, thus, firstly not permitting the machine to be moved over the pipeline with the rotors brought apart, for instance for by-passing an insurmountable obstacle, and secondly, requiring digging up the trench for the machine mounting-dismantling. In order to prevent the rotors jamming under the pipeline, the axes of the posts rotation should be maximum close to the vertical plane of the pipeline symmetry, thus not permitting the travelling unit to be placed between them, thereby increasing the machine overall dimensions. The absence of the breasts adversely affects the quality of the trench bottom under the pipeline. The upper end faces of the rotors coming closer to the pipeline lower surface for its cleaning from the soil, increases the probability of the pipeline damaging. Besides, the stepping travelling unit has comparatively large overall dimensions, complex design and is complicated to operate. Here, the average speed of the machine movement is more than 2 times lower than the speed of rotors feed to the soil face, thus lowering the ma
REFERENCES:
patent: 3429132 (1969-02-01), Martin
patent: 3877237 (1975-04-01), Norman
patent: 4395158 (1983-07-01), Brooks
patent: 5601383 (1997-02-01), Zanin
patent: 5639185 (1997-06-01), Saxon
Bykov Alexandr V.
Chernaev Valery D.
Dzhardzhimanov Alexandr S.
Ibragimov Marat Sh.
Koval Andrei B.
Aktsionernoe obschestvo otkrytogo tipa Aktsionernaya kompania po
Mammen Nathan
National Stock Company
Obschestvo s orgranichennoi otvetstvennoshtju Nauchno issledovat
Will Thomas B.
LandOfFree
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