KR20150081690A - Casing for Ground Test to Offshore - Google Patents

Abstract

The present invention relates to a casing installed to make a condition similar to an excavation work in the deep sea on the ground to perform an excavation test. More specifically, the casing can maintain straightness while the casing is positioned on the excavated ground. To achieve the purpose, the present invention is the casing connecting unit casings to be positioned inside a pipe reinforcing a drilling hole formed on the ground. The present invention comprises: a plurality of flexible spacers installed in a convex shape toward the outside on an outer circumferential surface of the unit casing; and a rotation preventing pins fixated to the outer circumferential surface of the unit casing.

Description

{Casing for Ground Test to Offshore}

The present invention relates to a casing installed to carry out an excavation test by similarly forming a deep-water excavation condition on the ground, and in particular, is capable of maintaining straightness in positioning a casing on an excavated ground.

As deep drilling should be done for drilling, drilling conditions should be established on the ground similar to the drilling conditions in order to dry the drilling rig before the excavation test.

In order to create conditions similar to deep-sea excavation conditions on the ground, the ground is first excavated to a predetermined depth, and concrete is cured after casting to form a rock-like condition.

In placing the concrete in the perforated hole thus excavated, the casing is installed in the perforation hole to secure the straightness of the excavation point. The straightness of the casing is important in the excavation test.

In the past, a unit length casing was inserted into the perforation hole and another unit casing was welded or screwed into the raised casing, and inserted into the perforation hole by the length of the unit casing.

By inserting the casing into the perforation hole and pouring and curing the concrete through the casing, the concrete cured in the perforation hole will have similar conditions to the rocks at the deep excavation point.

However, in the case of the conventional casing, there is a problem that the casing is bent or the straightness is lost during pouring and curing of the concrete.

Korean Patent Publication No. 10-2005-0051412 (published on Jun. 1, 2005)

The present invention has been made in order to solve the problems of the prior art as described above, and it is an object of the present invention to provide a ground test method for deep water excavation, which can maintain a proper position of a casing while concrete is placed and cured through a casing inserted in a perforation hole The purpose is to provide caging.

In order to achieve the above object, according to the present invention, there is provided a casing for connecting unit casings so as to be located inside a pipe for reinforcing a perforation hole formed in a ground, wherein the casing is provided with an outer circumferential surface convexly curved And the rotation preventing pins are fixed to the outer circumferential surface of the unit casing.

In addition, according to a preferred embodiment of the present invention, one end of the flexible spacer having a curved length in the middle is welded and fixed to the unit case, and the outwardly curved portion is in contact with the inner circumferential surface of the pipe to generate a repulsive force.

In addition, according to a preferred embodiment of the present invention, the anti-rotation pins are fixed to the outer circumferential surface of the unit casing at an equal angle, and are formed in a multi-layered structure with intervals in the longitudinal direction of the unit casing.

Also, according to a preferred embodiment of the present invention, the rotation preventing pins and the flexible spacers are mounted on the unit casing located at the lowermost end of the casing inserted in the perforations.

As described above, the ground test casing for deep water excavation according to the present invention prevents twisting and warping of the casing by the rotation preventing pin fixed to the outer peripheral surface of the unit casing located at the lowermost stage, It is possible to maintain the correct position. Therefore, by maintaining the straightness of the casing accurately, accurate testing can be performed at the time of the subsequent excavation test.

1 is a conceptual view showing a ground test casing for deep water excavation according to the present invention,
FIG. 2 is a perspective view of the first unit casing shown in FIG. 1,
FIG. 3 is a conceptual view showing a state where concrete is laid and cured through the casing shown in FIG. 1. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a ground test casing for deep sea excavation according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of a first unit casing shown in FIG. 1, and FIG. 3 is a cross-sectional view of a concrete test apparatus according to a first embodiment of the present invention. FIG. And Fig.

1, the ground testing casing 100 is inserted into the perforation hole 1 formed in the ground with the unit casings 111 connected to each other, and the outer casing surface of the unit casing 111 The rotation preventing pins 130 and the flexible spacers 120 are mounted.

Below, the ground test casing for deepwater excavation constructed in this way is described in detail.

A steel pipe (3) is inserted into the perforation hole (1) formed in the ground to reinforce the ground. Then, the unit casing 111 is inserted into the perforation hole 1, that is, the steel pipe 3 while the other unit casing 111 is connected with the unit casing 111 prepared in advance standing upright.

2, among the first unit casing 111A inserted in the perforation hole 1, that is, the unit casing 111 connected in the vertical direction, so as to maintain the proper position of the casing 100, The rotation preventing pin 130 and the flexible spacer 120 are mounted on the unit casing 111A.

More specifically, the first unit casing 111A is fitted with the flexible spacers 120 at an equal angle along the outer peripheral surface, and the rotation preventing pins 130 are formed on the upper portion of the flexible spacer 120 to cover the outer peripheral surface of the first unit casing 111A And are arranged in a double layer at intervals in the longitudinal direction of the first unit casing 111A.

Here, the flexible spacer 120 is welded and fixed to the first unit casing 111A at one end of the flexible spacer 120 in a state in which the steel plate is curved as shown in FIG. At this time, the curved portion 121 has a convexly protruding shape outwardly of the first unit casing 111A.

The flexible spacer 120 protruding outwardly of the first unit casing 111A generates a repulsive force while elastically deforming the curved portion 121 by an externally applied force and is repelled by the repulsive force to the inside of the steel pipe 3 And the position of the casing 100 located therein is held. According to the feature of the flexible spacer 120, at least three or more flexible spacers 120 should be mounted along the circumference of the first unit casing 111A.

The flexible spacer 120 is mounted on the lower end of the first unit casing 111A and the rotation prevention pins 130 are mounted on the upper portion of the flexible spacer 120.

The rotation prevention pin 130 is fixed by welding a rectangular flat plate thickness surface to the outer peripheral surface of the first unit casing 111A. The rotation prevention pin 130 is also disposed on the outer peripheral surface of the first unit casing 111A, And are formed in a multi-layered manner with intervals in the longitudinal direction of the first unit casing 111A.

As shown in FIG. 3, the anti-rotation fin 130 prevents the casing 100 from being warped and twisted during the concrete pouring and curing process through the casing 100.

The first unit casing 111A on which the flexible spacer 120 and the rotation prevention pin 130 are mounted is erected on the upper portion of the perforation hole 1 through a crane and inserted into the perforation hole 1. [ The unit casings 111 are connected in the order of welding the next unit casing 111 to the upper end of the first unit casing 111A in a state where the upper end of the first unit casing 111A is located outside the perforation hole 1 Is inserted into the perforation hole (1).

Although the unit casings 111 are welded and connected in the above description, the unit casings 111 may be connected to each other at both ends of the unit casing 111 by screwing.

100: Kaying
111: Unit casing
111A: First unit casing
120: Flexible spacer
121:
130: Anti-rotation pin

Claims (4)

A casing in which unit casings are connected to be positioned inside a pipe for reinforcing a perforation hole formed in a ground,
A plurality of flexible spacers mounted on the outer circumferential surface of the unit casing in a convexly curved shape outwardly,
And a rotation preventing pin fixed to an outer circumferential surface of the unit casing.
The method according to claim 1,
Wherein one end of the flexible spacer having a curved middle portion is welded and fixed to the unit case, and a portion curved outwardly convex is brought into contact with the inner peripheral surface of the pipe to generate a repulsive force.
The method according to claim 1,
Wherein the rotation preventing pin is fixed to the outer circumferential surface of the unit casing at an equal angle and is formed in a multi-layered structure with intervals in the longitudinal direction of the unit casing.
4. The method according to any one of claims 1 to 3,
Characterized in that the unit casing located at the lowermost one of the casings inserted in the perforations is equipped with anti-rotation pins and flexible spacers.

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