JP3145605B2 - Casing tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casing tube that is driven by an all-casing excavator to maintain a hole wall of a shaft or a foundation pile.

[0002]

2. Description of the Related Art As a casing tube of this type, there is a conventional one as shown in FIG. As shown in the figure, the body of the casing tube has a box-shaped structure composed of an outer plate 25, an inner plate 26, an inner rib 27, and upper and lower, left and right partition plates 28. After a plurality of ribs 29 are connected at right angles to the outer diameter surface of the extension 26, an upper flange 31, a lower flange 32 and a vertical flange 33 having bolt holes 30 for fastening at both ends are formed.

[0003] In the sealing method, a circumferential groove 34 and a straight groove 35 are provided so as to be concentric on one joining surface of the upper flange 31 and the vertical flange 33, and a compressive seal such as an O-ring 36 or a segment seal 37 is provided in the groove. Is inserted and fastened with the connecting bolt 38 and the nut 39, so that the lower flange 32 and the vertical flange 33 of the mating side are pressed against each other to completely seal the entire circumference.

[0004]

In a conventional casing tube, the upper and lower and the vertically divided connecting portions are of a flange type with bolts and nuts fastened.
It has a box-shaped structure consisting of an inner plate, inner ribs, and a partition plate. Many ribs are also used for flange mounting.

[0005] Therefore, there are disadvantages that the structure is complicated, sheet metal and welding man-hours are increased, welding distortion is large, extra work is required for correction, the production period is long, and the cost is high. In addition, it is required to reduce the thickness of the casing tube from the excavation performance at the time of driving, but there is a problem in terms of function because the thickness of the upper and lower and vertical connecting portions need to be increased for bolt and nut fastening. In addition, the weight is heavy and the cost is disadvantageous.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a casing tube in which the thickness of the upper and lower and vertically divided connecting portions can be reduced with a simple structure.

[0007]

Casing tube according to the present invention According to an aspect of the male vertical and longitudinal split connecting portion is fastened by a fastener superposed inner and outer two flanges, in a casing tube of the female joint system, the Casein
And the split casing tube
An arc-shaped groove is formed on the distal end surface of the inner male joint formed on the upper and lower connecting portions of the probe, and a straight groove that is concentric with the arc-shaped groove is formed on the distal end surface of the inner male joint formed on one of the vertical split connecting portions. respectively, each of the inner male join when inserting a compressible sealing material in these grooves jointed
The joint joint is completely sealed by pressing the tip end surface of the joint to the stepped flat surface of the mating female joint base. Further, it is preferable to use a lock pin that uses both bolts and nuts as the fastener, since the fastening can be performed more reliably. The lock pin is screwed
Having a blind lid to seal the joint prevents water from entering
It is suitable.

[0008]

According to the above construction, by forming the seal grooves on the end surfaces of the inner male joints of the upper and side connecting portions, the upper and lower circumferential grooves and the side straight grooves can be concentrically joined, and the outer female portion can be joined. The structure is pressed against the stepped flat surface of the joint base, so that groove processing is easy and a reliable seal around the entire circumference is possible.

In addition, since the connection system is a lap joint system consisting of two inner and outer plates, the thickness of the casing tube can be reduced, and recesses can be formed in the flange and rib portions as in the conventional flange fastening system. Since the outer surface is flat and the excavation resistance is low, the excavation performance can be improved, and the fuselage can be made into a single single-plate structure, or the outer and inner plates can be made thinner as a box-type structure. Significant cost reduction can be achieved by reducing man-hours.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is an overall structural view of a casing tube according to the present invention, FIG.
FIG. 3 is a structural view of a lock pin for fastening the upper and lower and vertical two-part connecting portion, and FIG. 4 is a construction state diagram of the all casing method.

In FIG. 4, an all-casing excavator 1
Is a machine that clamps the casing tube 2 that maintains the excavated hole wall and pushes it in while rotating or swinging,
The construction state of the all-casing method in which the earth and sand in the casing tube 2 is discharged by the excavation bucket 3 and the casing tube 2 penetrates to a predetermined depth is shown.

FIGS. 1 and 2 show an embodiment of a vertically divided structure.
There is a single body plate 4 in the center, a male joint 5 for vertical connection above it, a female joint 6 below it, and a vertical 2
A male joint 7 and a female joint 8 for split connection are fixed by lock pins 9 for fastening.

A seal groove 10 is circumferentially formed on the upper end surface of the upper inner male joint 5, and a segment seal 11 is inserted therein. A seal groove 12 is also formed in a straight shape on the side end surface of the male joint 7 on the inner side of the vertical split part, and is connected concentrically with the seal groove 10 on the upper end surface, and a segment seal 13 is formed in the circumferential segment. Seal 1
1 so as to be pressed downward.

In the illustrated example, the male and female joints 5 and 6 of the upper and lower connecting portions and the male and female joints 7 and 8 of the vertical split portion are formed separately from the body plate 4 and welded. (See FIG. 3), but may be formed integrally.

Considering the case where two female joints shown in FIG. 1 are connected up and down, when the female joint 6 is inserted into the male joint 5, the stepped flat surface 14 at the root of the female joint 6 It is pressed against the upper surface and the entire peripheral surface is completely sealed.

When the male joint 7 and the female joint 8 are joined to each other as shown in FIG.
Is pressed against the side surface of the segment seal 13 to completely seal the left and right vertical divided surfaces.

FIG. 3 shows the structure of the lock pin 9 used for fastening the overlapping portions of the male and female joints 5, 6, 7, and 8 in the vertical and vertical divisions. The lock pin 9 is composed of a lock pin body 18 in which the outer diameter side is tapered and a bolt 17 is rotatably sealed in the center, and the male joints 5, 7 and the female joints 6, which are vertically and vertically divided into two parts.
Female joints 6 into the tapered holes 19 and 20
The bolt 17 is screwed into the round nut 21 welded to the inner diameter side of the male joints 5 and 7 and fastened. A blind lid 23 is attached to the screw 22 of the round nut 21 by welding in order to prevent water from entering.

[0018]

As described above, the vertical split type casing tube of the present invention has an upper and lower and a vertical split portion which is a superposed joint type comprising two plates inside and outside, and a seal groove is formed on the end face of the inner male joint. And insert the sealing material,
The configuration in which the sealing material is pressed against the stepped flat surface at the base of the mating female joint has the following excellent features as compared with the conventional flange fastening type. Since the connecting portion can be made thinner than the flange type, the whole body can also be made thinner, the excavation resistance is reduced, and the performance is improved. Since it can be made thin, the structure is simple, the number of manufacturing steps is small, and the weight can be reduced, the manufacturing period is short, and the cost can be greatly reduced. By adopting a sealing method by pressing the male joint end surface and the stepped flat surface of the female joint root,
It is possible to provide a highly reliable casing tube with a perfect seal around the entire circumference, which is easy to groove and inexpensive.

[Brief description of the drawings]

FIG. 1 is an overall structural view of a casing tube according to one embodiment of the present invention.

FIG. 2 is a structural diagram of the same when it is vertically divided into two parts.

FIG. 3 is a structural view of the lock pin.

FIG. 4 is a construction state diagram of an all-casing method.

FIG. 5 is an overall structural view of a conventional casing tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 All casing excavator 2 Casing tube 3 Excavation bucket 4 Body plate 5 Male joint 6 Female joint 7 Male joint 8 Female joint 9 Lock pin 10 Seal groove 11 Segment seal 12 Seal groove 13 Segment seal 14 Stepped flat surface 15 Stepped flat surface 17 bolt 18 lock pin body 19 tapered hole 20 tapered hole 21 round nut 22 screw 23 blind lid

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-257369 (JP, A) JP-A-6-317096 (JP, A) JP-A-5-280292 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) E21B 17/00 E21B 17/02 E21B 17/08 E21B 7/20

Claims (3)

(57) [Claims] 1. A vertical and male vertical dividing connecting portion is fastened by a fastener superposed inner and outer two flanges, in a casing tube of the female joint system, the Keshi
The dividing tube is divided into two parts vertically, and each divided casing
An arc-shaped groove is formed on the distal end surface of the inner male joint formed on the upper and lower connecting portions of the tube, and a straight groove which is concentric with the arc-shaped groove is formed on the distal end surface of the inner male joint formed on one of the vertical split connecting portions. provided, each of the inner male Joy when inserting a compressible sealing material in these grooves jointed
The joint tube is completely sealed by pressing the distal end surface of the joint to the stepped flat surface of the mating female joint base portion. 2. The casing tube according to claim 1, wherein the fastener is a lock pin used in combination with a bolt and a nut. 3. The lock pin seals a threaded joint.
3. The casing tube according to claim 2, further comprising a blind lid.