JP2021110094A - casing - Google Patents

Abstract

To provide a casing improved in work efficiency, reduced in power consumption and bringing preferable labor safety, in hoisting and hanging, burying in the ground, mutual connection or pulling-up works in a casing method.SOLUTION: A casing 1 has a body part 2 and connection parts 10. The body part 2 has a body part side inner pipe 3 and a body part side outer pipe 4. The body part side inner pipe 3 is connected to inner peripheral edges of base end side flanges 14, and the body side outer pipe 4 is connected to outer peripheral edges of the base end side flanges 14. The connection part 10 has an outer end side flange 13, the base end side flange 14, a connection part side inner pipe 11 and reinforcement ribs 12. The connection part side inner pipe 11 is separately connected to the inner peripheral edges of the outer end side flange 13 and the base end side flange 14. The reinforcement ribs 12 are arranged along an outer peripheral surface of the connection part side inner pipe 11. The outer end side flange 13 is provided with bolt insertion holes 15 for inserting bolts.SELECTED DRAWING: Figure 3

Description

The present invention relates to a casing used in a casing construction method. More specifically, the present invention relates to an improvement of a casing buried in the soil in order to stabilize the hole wall when a vertically long hole is excavated in the soil by constructing a casing method.

Such casings are arranged in advance to a predetermined length, and are used by being connected in the axial direction according to the depth of the holes.
The casings were generally connected by welding the subsequent casings when the previous casing was buried to a desired depth.
On the other hand, in order to save the trouble of welding at the site, there is also a method (lock pin type) in which the connecting parts are welded to both ends of the casing in advance and the connecting parts are mechanically fastened to each other with bolts and nuts at the site. It has been adopted.
Patent Document 1 discloses a technique related to the present invention.

JP-A-2017-8489

A casing having a lock pin type connecting portion includes a main body portion and a connecting portion welded to the end portion thereof. The main body is made of an elongated cylindrical steel pipe, and its thickness is relatively thick in order to secure sufficient mechanical rigidity.
As a result, the amount of steel used has increased, raising manufacturing costs. In addition, since a thick steel material is used, the weight is increased, and as a result, transportation, burying, drawing and other operations are hindered.

The present invention has been made to solve the above problems, and is defined as follows.
That is, it is a casing used in the casing method, and the casing includes a main body portion and a connecting portion.
The main body is provided with an inner tube on the main body side and an outer pipe on the main body side, and a space is opened between the inner and outer pipes on the main body side.
The connecting portion is provided with an outer end side connecting edge and a base end side tangent edge.
The main body side inner tube of the main body is connected to the inner peripheral edge of the base end side connecting edge, and the main body side outer pipe is connected to the outer peripheral edge of the base end side connecting edge.
A casing in which a receiving portion for mechanical connecting means is formed on the connecting edge on the outer end side of the connecting portion.

In the casing of the first aspect of the present invention defined in this way, the main body has a double structure including an inner tube and an outer tube. By having a double structure in the main body, sufficient rigidity can be ensured in the main body even if a thin plate is used for the inner tube and the outer pipe. As a result, it is possible to reduce the weight of each step as compared with the conventional main body portion using a thick steel material. As a result of the weight reduction, the material cost of the main body and the entire casing is reduced.

In the above, it is preferable to adopt the connecting portion having the following configuration.
The connecting portion includes an outer end side flange as an outer end side connecting edge, a base end side flange as a base end side connecting edge, a connecting part side inner pipe, and a reinforcing rib, and the connecting part side inner pipe is the outer side. It is connected to the inner peripheral edge of the end side flange and the inner peripheral edge of the base end side flange, the reinforcing ribs are arranged along the outer peripheral surface of the connecting portion side inner pipe, and the outer end side flange is of a mechanical connecting means. A pin hole is provided as a receiving portion.

In the connecting portion of the above structure, the base end side flange is welded to the end portion of the main body portion. By connecting the inner tube on the connecting portion side to the inner peripheral edge of the outer end side flange and the base end side flange, the outer peripheral edge of the outer end side flange is exposed. As a result, a work space for connecting the outer end side flanges is secured. The distance between the outer end side flange and the base end side flange shall be a length that does not interfere with the use of tools such as impact. In addition, the width of each flange shall be wide enough to receive bolts and nuts.

The connection between the flanges on the outer end side is by passing a bolt from one side through a pin hole formed in each of them in the axial direction of the casing and screwing it into a nut from the other side. Of course, by fastening other mechanical elements through the pin holes, the outer flanges can be connected to each other.

In the connecting portion, the outer end side flange and the base end side flange are connected by an inner tube. In other words, it does not have a double structure like the main body. Therefore, reinforcing ribs are arranged to ensure the mechanical rigidity of the connecting portion. This reinforcing rib is along the outer peripheral surface of the inner tube. Further, it is preferable that the flanges are bridged between the facing surfaces of the flanges.

Pipe through holes are formed in the outer end side flange and the base end side flange of the connecting portion. When the outer end side flange and the base end side flange are abutted, the pipe through holes formed in each flange shall communicate with each other.
It is preferable to attach a metal or synthetic resin socket to the pipe through hole of the outer flange. This socket fits into a socket attached to the other outer flange when the outer flanges are butted against each other. In other words, a male socket is attached to one pipe through hole of the outer end flange located at both ends of the casing, and a female socket is attached to the other outer flange. A pipe is hung between each socket. This pipe penetrates the pipe through hole of the flange on the base end side and penetrates the space between the outer and inner tubes of the main body. Since the pipe is arbitrarily selected according to the intended use, the diameter of the pipe through hole is appropriately selected according to the pipe and the flange portion on the outer end side according to the pipe socket. The pipe passed through the pipe hole of each flange is passed between the inner pipe and the outer pipe in the main body. As a result, the pipe is arranged along the casing while being protected in the main body. In order to pass the pipe, a space having a width larger than the outer diameter of the pipe is provided between the inner pipe and the outer pipe of the main body.

According to the casing having the above configuration, the pipe is passed through the space between the outer and inner tubes in the main body portion, and is also passed through the pipe through hole formed in the outer end side casing and the base end side casing in the connecting portion as well. Therefore, it does not protrude from the outer peripheral edge of each casing to the outside. That is, the pipe is not arranged outside the outer peripheral surface of the casing.
Furthermore, by attaching the socket to the outer end side casing, the pipes are connected via the socket even at the joint between the casings, which facilitates the connection work and the mechanical strength after the connection. As a result, durability is ensured.

On the other hand, in the conventional casing, since the double pipe structure is not adopted, the pipes are arranged along the outer surface of the casing. Specifically, a metal rail that protects the pipe is prepared, and this rail is axially welded to the outer surface of the casing. This rail was a resistance when rotating the casing. On the other hand, in the casing of the present invention, since the pipe is built in the wall, the rail is unnecessary.
Conventionally, the pipe inserted into the rail of one casing and the pipe inserted into the rail of the next casing have been connected via synthetic rubber or other flexible pipe. This was to facilitate alignment at the time of connection, but it was difficult to secure the mechanical strength of this part. On the other hand, in the present invention, since it can be performed by using a socket attached to the flange on the outer end side, not only the alignment at the time of connection becomes easy, but also the mechanical stability and durability after connection are achieved. Is improved.

It is preferable to provide a reinforcing material between the inner tube and the outer tube of the main body. By providing the reinforcing material, at least one of the inner pipe and the outer pipe can be made thinner. Therefore, further weight reduction of the main body and the casing can be achieved. The reinforcing material is preferably welded to the inner pipe. It is also possible to weld to the outer end side flange and the base end side flange. It is preferable that the reinforcing material has the same height as the width of the space between the inner pipe and the outer pipe. This is to support the outer pipe by contacting it with the outer pipe.

As an example of this reinforcing material, it is preferable to employ axial ribs in order to avoid interference with the pipe. Of course, it is also possible to provide a spiral rib in the circumferential direction of the main body portion and use this as a reinforcing material. In the case of such a reinforcing material, a notch is provided to prevent interference with the pipe.

(A) is a partially cutaway perspective view showing a casing used other than the deepest portion, and (B) is a partially cutaway perspective view showing a first casing used on the deepest portion side. (A) and (B) are perspective views showing a pair of upper and lower connecting portions in the casing of FIG. 1 (A). (A) is a vertical cross-sectional view at an arbitrary position along the central axis of the casing of FIG. 1 (A), (B) is a partial vertical cross-sectional view in (A), and (C) is in (A). It is a partial horizontal cross-sectional view along the arrow view of the CC line of.

Hereinafter, embodiments for carrying out the present invention will be described.
As shown in FIGS. 1 (A), 2 (A), (B), and 3 the casing 1 of the embodiment of the present invention, the casing 1 has a cylindrical shape as a whole and is located in the middle of the axial (vertical) direction. A main body 2 and a pair of upper and lower connecting portions 10 located on both sides of the main body 2 are provided.
The main body 2 is composed of a main body side inner pipe 3 and a main body side outer pipe 4 having a coaxial center inside and outside, and a cylindrical space 5 is located between the two. The main body side inner pipe 3 and the main body side outer pipe 4 are both made of vertically long steel pipes having a relatively thin wall thickness. In this example, the outer diameter of the entire casing 1 is about 1 m, and the total length (total height) in the axial direction is 6 m to 12 m.

As shown in each of the above-described drawings, the connecting portion 10 is composed of a ring-shaped outer end side flange 13 and a base end side flange 14, a cylindrical connecting portion side inner pipe 11, and a plate-shaped steel material. It is provided with a reinforcing rib 12 of the above.
The inner pipe 11 on the connecting portion side is connected by welding w between the inner peripheral edges of the flanges 13 and 14 on the outer end side and the base end side, and the plurality of reinforcing ribs 12 are on the outer peripheral surface of the inner pipe 11 on the connecting portion side. It is arranged along the axial direction of the inner pipe 11 and is welded here. The upper and lower ends can be welded to the inner peripheral edges of the outer end side / base end side flanges 13 and 14.
The wall thickness of the connecting portion side inner pipe 11 is the same as that of the main body portion side inner pipe 3 and the main body portion side outer pipe 4.

The main body side inner pipe 3 of the main body 2 is for the inner peripheral edge of each of the base end side flanges 14 of the pair of upper and lower connecting portions 10, and the main body side outer pipe 4 is for the outer peripheral edge of each base end side flange 14. They are individually connected by welding w.
As shown in FIGS. 2 (A), 2 (B), and 3 (A), a plurality of bolt through holes 15 are axially provided as pin holes in the circumferential direction of the outer end side flange 13 of the connecting portion 10. It is provided along. As shown in FIG. 3B, the bolt through holes 15 are capable of communicating with each other when the outer end side flanges 13 of the casings 1 adjacent to each other are in surface contact with each other, and the pair of upper and lower bolts. By inserting the bolt 23 into the through hole 15 and fastening the nut 24 to the tip side of the male screw in the bolt 23, the plurality of casings 1 can be firmly connected along the axial direction. The bolt through holes 15 are provided at substantially intermediate positions between the plurality of reinforcing ribs 12 in a plan view.

Further, as shown in each of the above-described drawings, a pair of pipe through holes are provided at symmetrical positions with the central axis sandwiched between the outer peripheral side and the inner peripheral edge sides of the flanges 13 and 14 on the outer end side and the proximal end side of each connecting portion 10. 16 is provided so as to be at the same position in the axial direction. For example, a metal or synthetic resin pipe P is inserted into the pipe through hole 16 along the axial direction of each of the plurality of casings 1. The pipe P is used to supply cooling water or oil pressure from the ground surface side to the vicinity of the excavation bit 9 of the casing 1a on the deepest side as described below.
A socket (not shown) is inserted into the paoip through hole 16 of each outer end side flange 13, and the pipe is connected to the socket. These sockets are in a fitting relationship with the sockets attached to the pipe through holes of the flanges 13 on the outer end sides of the adjacent casings.

As shown in FIGS. 3A and 3C, the space 5 located between the main body side inner pipe 3 and the main body side outer pipe 4 of the main body 2 is along the axial direction of the inner pipe 3. A plurality of reinforcing members 20 welded w are arranged, and further, a plurality of reinforcing members 21 welded w are arranged along the circumferential direction of the inner pipe 3. These reinforcing members 20 and 21 have a lattice shape as a whole in a side view.
At least one of these reinforcing members 20 and 21 can be omitted.

FIG. 1B is a perspective view showing a casing (first casing) 1a connected to the deepest portion (bottom stage) side of a plurality of casings 1 connected to each other.
As shown in FIG. 1B, the casing 1a is formed by the same main body 2 located in the middle in the axial direction, the similar connecting portion 10 located on the upper side of the main body 2, and the main body 2. It is provided with a tip portion 7 arranged on the lower side. The tip portion 7 is composed of a tip end side outer pipe 8 having a cylindrical shape as a whole, and a plurality of excavation bits 9 attached along the circumferential direction on the lower end surface of the outer pipe 8. The tip side outer pipe 8 is made of a relatively thick steel pipe, and its upper end surface is welded to the lower end surfaces of the main body side inner pipe / outer pipes 3 and 4 of the main body 2.
A through hole 6 having a circular cross section having substantially the same inner diameter penetrates inside (center side) of the main body portion 2, the tip portion 7, and the connecting portion 10 of the casings 1 and 1a.

The present invention is not limited to the forms described above.
For example, the thicknesses of the main body side inner pipe 3, the main body side outer pipe 4, and the connecting portion side inner pipe 11 of the main body portion 10 may be different from each other.
Further, the main body side inner pipe 3, the main body side outer pipe 4, and the connecting part side inner pipe 11 have a seamless pipe, a UO pipe having a welded portion w along the axial direction, and a UO pipe along the axial direction. A spiral pipe having a spiral welded portion w may be used.
Further, the main body side inner pipe 3 and the connecting side inner pipe 11 may be formed of the same single steel pipe, and in such a form, the inner peripheral edge of the base end side flange 14 of the connecting portion 10 is the flange. It becomes the end face on the inner peripheral side in 14.

Further, in the space 5 located between the main body side inner pipe 3 and the main body side outer pipe 4 of the main body 2, only one of the reinforcing members 20 and 21 is arranged or reinforced. A form in which both the materials 20 and 21 are not arranged may be used.
Further, at least one pipe P may be used, and in such a form, one pipe through hole 16 is provided for each of the outer end side and the proximal end side flanges 13 and 14. Moreover, a flexible resin hose or a metal pipe that is easily plastically deformed may be used for the pipe P.

Further, a recess (inrow) or the like for facilitating the positioning of the adjacent casings 1 and 1 may be formed in advance on the end surface of the outer end side flange 13 of the connecting portion 10 on the connecting side.
In addition, the reinforcing ribs 12 of the connecting portion 10 may be arranged in a slightly inclined posture with respect to the axial direction of the casings 1 and 1a.

In the embodiment, by inserting a mechanical connecting means typified by a bolt-nut in the axial direction of the casing, the outer-end side casings of adjacent casings, that is, the outer-end side connecting edges are mechanically connected to each other.
It is also possible to insert the mechanical connecting means in the radial direction (direction perpendicular to the axis) of the casing with respect to the connecting edge on the outer end side. For example, a connecting tooth extending in the axial direction is provided on the connecting edge on the outer end side, and this is overlapped with the connecting tooth on the connecting edge on the outer end side on the mating side in the radial direction. Then, a bolt or the like is inserted into the casing in the radial direction to connect the two. In this case, the connecting portion is a solid tubular member having the same thickness as the thickness of the main body (distance from the outer peripheral surface of the outer pipe to the inner peripheral surface of the inner tube), and one end edge (base end side connecting edge). The outer and inner tubes of the main body are welded. The above connecting teeth are formed on the other end edge (outer end side side edge).

In addition to the above, the casings 1 and 1a of the present invention can be changed to an appropriate form within a range that does not deviate from the gist of the present invention.

According to the present invention, in the lifting and hanging of a casing in the casing method, burying in soil, mutual continuous installation, and pulling work, work efficiency is improved, power consumption is reduced, and occupational safety is improved. Can certainly provide a preferred casing.

1,1a …… Casing 2 ……………… Main body 3 ……………… Main body side inner pipe 4 ……………… Main body side outer pipe 5 ……………… Space 10 ………… Connecting part 11 ………… Connecting part side inner pipe 12 ………… Reinforcing rib 13 ………… Outer end side flange 14 ………… Base end side flange 16 ………… Pipe through hole 20, 21… Reinforcing material 23 ………… Bolt P ……………… Pipe

Claims (6)

A casing used in the casing method
The casing includes a main body portion and a connecting portion, and has a main body portion and a connecting portion.
The connecting portion is provided with an outer end side connecting edge and a base end side tangent edge.
The main body portion includes a main body portion side inner tube and a main body portion side outer tube, the main body portion side inner tube is connected to the inner peripheral edge of the proximal end side connecting edge, and the main body portion side outer tube is connected to the proximal end side. Connected to the outer periphery of the connecting edge,
A casing in which a receiving portion for mechanical connecting means is formed on the connecting edge on the outer end side of the connecting portion. The connecting portion includes an outer end side flange as the outer end side connecting edge, a base end side flange as the base end side connecting edge, a connecting part side inner pipe, and a reinforcing rib.
The connecting portion side inner pipe is connected to the inner peripheral edge of the outer end side flange and the inner peripheral edge of the base end side flange.
The reinforcing ribs are arranged along the outer peripheral surface of the connecting portion side inner pipe.
The outer end side flange is provided with a pin hole as a receiving portion of the mechanical connecting means.
The casing according to claim 1, wherein the main body side inner pipe is connected to the inner peripheral edge of the base end side flange, and the main body side outer pipe is connected to the outer peripheral edge of the base end side flange. The outer end side flange and the base end side flange of the connecting portion are provided with pipe through holes for passing pipes.
The casing according to claim 2, wherein a space for passing the pipe is arranged between the main body side inner pipe and the main body side outer pipe of the main body. The casing according to claim 2 or 3, wherein a reinforcing material is disposed between the main body side inner pipe and the main body side outer pipe of the main body. The casing according to claim 3, wherein the pipe is further passed through the pipe through hole. The casing according to claim 5, wherein a socket is attached to the pipe through hole of the outer end side flange, and the pipe is connected to the socket.

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