DD218922A1 - CORE TUBE FOR LOCKERGESTEIN CALLING - Google Patents

Abstract

The invention relates to a core tube closure for loose rock exploration and is particularly suitable for soil sampling from kohaesionlosen and wasserfuehrenden layers. The aim of the invention is to make it possible with simple means a complete and as possible undisturbed core gain. The technical object of the invention is to develop a core tube closure for the loose rock exploration, which opposes the entry of the core into the core tube no additional resistance, is easy to handle, safe and tight closes and can be used in different core tube systems. According to the invention, this object is achieved in that a spring guide tube is arranged in a core tube, in which closure springs are located over the entire circumference, which are insertable into the inner cross section of the core tube and form a hemispherical closure.

Description

embodiment

The invention will be explained in more detail below using an exemplary embodiment. The sectional view of a rope core tube used with a hollow screw, which is equipped with the core tube closure on which the invention is based, is shown in FIG. 1 for clarity. ^! _r '

A Seilkerninnenrohr, which consists of a transition piece 1 with attached Außrohr 2 and .Innenrohr 3 is mounted in a known manner with a Overshot on a rope in the equipped with a drill bit 21 lower hollow screw segment 22 and at the upper end with a normal lock (not shown) locked in the lower hollow screw segment 22.

Further centering of the cable core inner tube is effected by the locking pins 17 arranged in the drill bit 21, which engage in the groove of the guide ring 16 when the cable core inner tube is suspended. The spring-loaded locking bolt 17, which are guided in a guide 18 and the pressure of which is adjustable by means of the adjusting screws 20 and the compression springs 19, continue to have the task of triggering the core tube closure when pulling the cable core inner tube filled with the drill core 23. The release takes place by the displacement of the guide ring 16 with the closure sleeve 14 relative to the spring guide tube 10 against the force of the compression springs 15, which are arranged between the closure sleeve 14 and the connecting sleeve 13. The closure springs 9 can enter through the resulting gap between the closure sleeve 14 and the spring guide tube 10 in the inner cross section of the inner core Seilkernrohres and hermetically complete the cross section. The closure springs 9 sever the drill core 23 at this point. The pushing out of the guided by the spring guide tube 10 and the outer tube 2 closing springs 9 takes place by means of the prestressed compression spring 5, which acts on the stationary with the spacer ring 8 spring connection ring 6. The bias of the compression spring 5 can be adjusted by means of the spacer ring 4.

The setting of the extension stroke of the closure springs 9 takes place through the spacer ring 8. The closure springs 9 are fixed by cylinder screws 7 on the spring connection ring 6. Between outer tube 2 and inner tube 3, a thrust ring 24 is attached, which serves as a stop for the spring guide tube 10. On the outer tube 2, a shock ring 12 is arranged as a stop for the connecting sleeve 13. To accommodate the entering core 23 may be housed between the inner tube 3 and the spring guide tube 10, a film tube 11 which is pulled out through the core 23 and the core 23 includes.

Claims (1)

-1- 255 839 1 Invention claim: Core tube closure for the loose rock exploration, which is arranged in a core tube used in a drilling apparatus, characterized in that the core tube closure of a spring guide tube (10), in the over the entire circumference evenly distributed over a spring connecting ring (6) arranged closure springs (9) are provided in that the spring connection tube (6) is connected to a compression spring (5), the spring guide tube (10) is designed to be closable on one side with a closure sleeve (14) located in a connection sleeve (13), between the connection sleeve (13) and the closure sleeve (14 ) over the entire circumference evenly distributed compression springs (15) are arranged, the closure sleeve (1Ί) with a guide ring (16) and the connecting sleeve (13) are connected to the core tube and the guide ring (16) by means of locking pins (17) in the drilling device is arranged.
For this 1 page drawings Core tube closure for loose rock exploration
Field of application of the invention The invention relates to a core tube closure for the loose rock exploration, which is used in the removal of soil samples from the unconsolidated rock, preferably from cohesionless and water-bearing layers. Characteristic of the known technical solutions Are known core tube caps and core catcher of different construction, the use of which depends on the cohesion of the layers to be drilled. Core layers are successfully used in cohesive layers. In water-bearing, cohesionless layers, e.g. Spring baskets, which are pushed upwards when entering the core, rubber slats or flap catcher used with more or less success. Water-bearing, cohesionless materials require a tight core tube closure if leakage is to be prevented. For these cases, solutions are known with flap systems, with a spring cage, which is pressed by the incoming material up or hydraulically operated closures, in which a tube, in which the sample is registered, is hydraulically closed at the bottom. The solutions mentioned except for the hydraulic termination without exception the disadvantage that they oppose the entering into the core tube sample material a more or less large resistance. In these cases, this makes further entry impossible, whereby the core profit is reduced and errors can occur. In the majority of cases, these systems can not achieve a sufficiently tight seal. In addition, that z. B. flap systems are constructed very complicated. The use of a hydraulic lock either requires the use of flushing, which in many cases is not possible, or one must lead an additional line, which requires additional effort and complicated technologies, to the bottom hole. Object of the invention ¹ The aim of the invention is to provide with simple means a complete and undisturbed as possible core gain in the removal of soil samples from the loess rock, preferably from cohesionless and water-bearing layers. . ·. · .., Explanation of the essence of the invention The technical object of the invention is to develop a core tube closure for the loose rock exploration, which opposes the entry of the core into the core tube no additional resistance, is simple and manageable, safe and tight closes and can be used in different core tube systems. According to the invention the object is achieved in that in a arranged in a drilling core tube, a spring guide tube is provided in which are distributed over the entire circumference uniformly distributed over a spring connecting ring arranged closure springs. At the side facing away from the drill bit of the spring guide tube of the spring connection ring, with the attached thereto closure springs, which are guided in the spring guide tube, and provided on the spring connection ring compression spring. The drill bit facing the side of the spring guide tube is formed by a closure sleeve located in a closure sleeve closable. Within the ferrule distributed over the entire circumference acting on the closure sleeve springs are installed. The core tube with the core tube closure arranged therein is locked and centered by locking pins arranged in the drill bit via a guide ring in the drilling device which is connected to the closure sleeve. The guided in the spring guide tube closure springs are biased and formed at its opposite end of the spring connection ring so that they form a hemispherical closure in the closed state of the core tube closure. The extension length of the closure springs can be adjusted by a spacer ring arranged between spring guide tube and guide ring. ,. In the open state, the closure springs are biased in the closed by the closure sleeve spring guide tube. In the closed state, the spring guide tube is open and the Verschiußfedern are pushed by acting on the spring connection ring force of the compression spring in the inner cross section of the core tube. The triggering of the KernroHrverschlusses takes place when pulling the core tube. In this case, the closure sleeve is moved against the force of the compression sleeve located between the closure sleeve and ferrule and released the spring guide tube for the entry of the closure springs in the inner cross section of the core tube. The closure springs penetrate the core core located in the core tube and close the core tube. '' The solution according to the invention is distinguished from the known solutions in that in the retracted state of the core tube closure ensures a smooth inner wall of the core tube and thus the drill core unhindered entry into the core tube is made possible. The core tube closure according to the invention is designed to be safe and tight closing, relatively simple in construction and uncomplicated in handling and maintenance. It can be used in different core tube systems and can be combined with a tube provided for receiving the core, which tube is arranged inside the core tube and is drawn off by the entering core and encloses it.