JP2005009603A - Pipe joint structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint structure of high strength. <P>SOLUTION: In this pipe joint structure composed of two single pipes 10, 10, an insert pipe 20 inserted between the single pipes 10, 10 adjacent to each other, and a pin 30, the insert pipe 20 is fitted and inserted in the single pipes 10, 10, first holes 11 formed on wall faces opposite to each other, of an end part of the single pipe 10 and second holes 21 penetrated through the insert pipe 20 are communicated and connected by the pin 30, whereby the single pipes 10, 10 adjacent to each other are connected. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe joint structure, and more particularly to a pipe joint for inserting a surveying instrument or the like into a borehole formed in the ground.
[0002]
[Prior art]
When building shafts, inclined shafts, tunnels, etc. on the ground, a stability survey of the target ground is conducted in advance.
For this investigation, for example, the core obtained by boring is observed, and the geological distribution status, crack status, and fracture zone status are grasped, and a borehole camera or CCD camera is inserted into the borehole to directly drill. There are methods for observing the inside of a hole and investigating the surface of the layer, the running of cracks, and the opening width of cracks in the ground.
When investigating by the latter method, the borehole camera and CCD camera are attached to the end of an iron pipe such as a boring rod or a PVC pipe (hereinafter collectively referred to as an insertion pipe) into the borehole. At this time, a pipe having a certain length is inserted while being added according to the depth of the boring hole.
This pipe joint structure includes a screw type and a connection type via a socket.
[0003]
[Problems to be solved by the invention]
The conventional pipe joint structure described above has the following problems.
<A> Since the threaded portion of the threaded type is thin with respect to the outer shape of the pipe, it is weak in strength. In addition, threading is expensive to manufacture.
<B> Since the socket connected with the socket is fixed with an adhesive, the member cannot be reused without disassembling it without cutting the member.
Also, it takes time for the adhesive to cure, and there is a risk of disconnection if this adhesion is incomplete.
Furthermore, in the type in which the socket is attached to the outside of the pipe, the cross section becomes large, and the protruding portion becomes an obstacle during insertion.
[0004]
OBJECT OF THE INVENTION
The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide a pipe joint structure that does not become a weak point in strength.
It is another object of the present invention to provide a pipe joint structure that is inexpensive to manufacture.
It is another object of the present invention to provide a pipe joint structure that can be easily disassembled after use and reused.
It is another object of the present invention to provide a pipe joint structure that is easy to connect and has no danger of disconnection.
It is another object of the present invention to provide a pipe joint structure in which no protrusion is generated on the peripheral surface of the pipe.
The present invention achieves at least one of these objects.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the pipe joint structure of the present invention is a pipe joint structure comprising two single pipes, an insert pipe fitted between adjacent single pipes, and a pin. The insert pipe is inserted into the single pipe, and a first hole provided in a wall surface facing the single pipe end and a second hole provided through the insert pipe are formed with the pin. By connecting and connecting, adjacent single tubes are connected to each other.
[0006]
In the pipe joint structure described above, the pin inserted through the first hole does not protrude from the peripheral surface of the single pipe.
[0007]
In the pipe joint structure described above, the peripheral surface of the single pipe including the first hole is covered with a sealing body after the pin is inserted into the first hole. It is.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0009]
<A> Overall Structure FIG. 1 is an exploded perspective view of a pipe joint structure, FIG. 2 is a transverse sectional view, and FIG. 3 is a sectional view along the axial direction of the pipe.
The present invention is a pipe joint structure comprising two single pipes 10, 10, an insert pipe 20 inserted between adjacent single pipes, and a pin 30. The insert pipe 20 is inserted into the single pipe 10. By connecting and connecting the first hole 11 provided in the opposite wall surface of the end of the single pipe 10 and the second hole 21 provided penetrating the insert pipe 20 with the pin 30, the single pipe 10, It is the structure which connects 10 mutually.
Further, the peripheral surface of the single tube 10 including the first hole 11 may be covered with the sealing body 40 after the pin 30 is inserted into the first hole 11 as necessary.
Hereinafter, each member will be described in detail.
[0010]
<B> Single tube The single tube 10 is a cylindrical member having a certain length, and the cross-sectional shape thereof may be, for example, circular or rectangular.
As the single pipe 10, necessary ones can be selected according to the load or application applied to the single pipe 10. For example, a pipe for steel pipe can be used.
It is preferable that the length of the single pipe 10 is set so that it can be easily carried by one worker.
[0011]
First holes 11 are formed at both ends of the single tube 10 at a predetermined distance from the end surface of the single tube 10.
The first hole 11 is formed in a wall surface facing the single tube 10 perpendicular to the axial direction of the single tube 10.
The 1st hole 11 is a hole which penetrates and arrange | positions the pin 30 mentioned later, Comprising: The edge part of the pin 30 is located in each 1st hole 11 which opposes, respectively. The first hole 11 has a shape that is not too large than the outer shape of the pin 30. For example, when the cross-sectional shape of the pin 30 is a round shape, the first hole 11 opens a round shape that is slightly larger than the pin 30.
The first hole 11 does not necessarily have to penetrate the wall of the single tube 10, and may have a bottomed structure formed from the inside to the outside of the single tube 10. Leave it through.
The first hole 11 is preferably formed so as to pass through the axis of the single tube 10.
[0012]
<C> Insert pipe The insert pipe 20 is a member that is fitted over and inserted into the adjacent single pipes 10, and stresses (axial stress and bending stress) generated in the single pipes 10, 10. It can propagate to the matching single tube 10.
It is preferable that the insert pipe 20 has a shape inscribed in the inner diameter of the single pipe 10 described above. As the insert pipe 20, for example, a pipe for steel pipe can be used.
[0013]
At both ends of the insert pipe 20, second holes 21, 21 penetrating the wall surface at a predetermined distance from the end surface are formed.
The second holes 21, 21 are formed on the opposite wall surface of the insert pipe 20 in a direction perpendicular to the axial direction of the insert pipe 20, and the pin 30 inserted through the first hole 11 of the single pipe 10 is inserted into the second hole 21, 21. Penetrate and place.
For example, when the first hole 11 provided in the single pipe 10 is provided so as to pass through the axis of the single pipe 10, the pin 30 is provided when the second hole 21 is provided so as to pass through the axis of the insert pipe 20. Can be arranged in communication with each of the holes 11 and 21. When such a form is used, the axial centers of the single pipe 10 and the insert pipe 20 can be made to coincide with each other by connecting the pins 30, and without mutually biasing the stress with respect to the axial force, Propagation is possible.
[0014]
A plurality of second holes 21 may be provided on the wall surface at the same distance from the end face of the insert pipe 20. That is, a plurality of holes can be provided on the wall surface of the insert pipe 20 at intervals in the circumferential direction. Accordingly, when the insert pipe 20 is inserted into the single pipe 10, the second hole 21 can be easily found from the first hole 11, and the pin 30 can be easily inserted.
The second hole 21 is formed at a sufficient interval from the end of the insert pipe 20.
The second holes 21 and 21 provided at both ends of the insert pipe 20 are preferably provided on the same axis on the peripheral surface of the insert pipe 20.
[0015]
<D> The pin pin 30 is a rod-like member that is continuously inserted into the first hole 11 provided in the single pipe 10 and the second hole 21 provided in the insert pipe 20.
The pins 30 propagate the force acting on the insert pipe 20 and the single tube 10 to each other through shearing on the pins 30. Therefore, a member having a structure that can resist the shearing force is used. For example, a solid steel material such as round steel can be used for the pin 30.
[0016]
The pin 30 is formed in such a length that it can be passed over the opposing holes 11 and 11 while being inserted through the first hole 11, and preferably the tip of the pin 30 is not protruded from the peripheral surface of the single tube 10. To do. That is, the length of the pin 30 is preferably larger than the inner diameter of the single tube 10 and smaller than the outer diameter.
[0017]
It should be noted that a thin plate-like member (a collar portion) may be provided at one end of the pin 30 perpendicularly to the pin 30 axis. As a result, the pin 30 inserted into the first hole 11 can be easily installed because the hook is caught on the peripheral surface of the single tube 10, and only by fixing only this hook to the single tube 10, The pin 30 can be prevented from falling off, and the thickness thereof is thin, so that it does not hinder the insertion.
[0018]
<E> Sealing body Sealing body 40 is a member that covers first hole 11 formed in single tube 10, and for example, a known adhesive tape or an elastic member such as a rubber band can be used.
If the inserted pin 30 does not fall out, the sealing body 40 does not necessarily have to be disposed in both the first holes 11 and 11 facing each other, and covers only a part of the opening of the first hole 11. There may be.
[0019]
【Example】
Below, the example which uses the joint structure of the pipe of this invention for the elongate pipe used when inserting investigation equipment (in this example a borehole camera) into the boring hole formed in the ground is demonstrated.
[0020]
<I> Production of a pipe joint structure The insert pipe 20 is inserted into the single pipe 10 cut to a required length by approximately half.
Next, another single pipe 10 is inserted into the insert pipe 20 protruding by half, and the single pipes 10 and 10 are brought into contact with each other.
After firmly placing the single pipe 10 so as not to roll, a hole penetrating from the upper part to the lower part is drilled in the wall surface of the single pipe 10 using a known drilling tool such as a drill. Thus, the first holes 11 and 11 and the second holes 21 and 21 are formed in the single pipe 10 and the insert pipe 20 at a time, respectively. These holes 11 and 21 are formed in a direction perpendicular to the axis of the single tube 10 and through the axis of the single tube 10. At this time, the first hole 11 and the second hole 21 are provided at a sufficient interval from each member end. Thus, the axial stress can be propagated through the pin 30 without breaking the end portions of the single pipe 10 and the insert pipe 20.
[0021]
Similarly, holes 11 and 21 are formed in adjacent single tubes 10. This position is preferably provided on the same axis of the peripheral surface of the single tube 10 with respect to the holes 11 and 21 previously formed. Thereby, the opening directions of the holes 11 and 11 become the same direction, and when the adjacent pins 30 and 30 are inserted, the single tubes 10 and 10 can be connected without rotating the single tube 10, so that the connection becomes easy.
In this way, the single pipe 10 in which the first hole 11 is formed and the insert pipe 20 in which the second hole 21 is formed are produced, the rod-shaped steel material is cut into a required length, and the pin 30 is formed. To complete the joint structure.
[0022]
<B> The members 10, 20, and 30 are carried into the pipe assembly site in a disassembled state.
One end of the insert pipe 20 is inserted into the end of the single pipe 10. The insert pipe 20 is fitted so that the first hole 11 of the single pipe 10 communicates with the second hole 31 of the insert pipe 20.
After connecting the first hole 11 and the second hole 21, the pin 30 is inserted.
The pin 30 is inserted through the first hole 11, the second hole 21, and the hollow of the insert pipe 20 in the order of the second hole 21 formed on the opposing wall surface and the first hole 11.
After the entire length of the pin 30 is inserted into the first hole 11, the first hole 11 is covered with the adhesive tape 40. If the adhesive tape 40 is doubled or tripled as necessary, the adhesive tape 40 contacts the hole wall of the boring hole, and even if one of them is peeled off, the adhesive tape 40 is covered with the remaining adhesive tape 40. Therefore, the pin 30 can be prevented from falling off.
[0023]
Next, another single pipe 10 is inserted into the protruding insert pipe 20.
The single tube 10 is also inserted until the end surface comes into contact with the other single tube 10 while the first hole 11 is aligned with the second hole 21 of the insert pipe 20, and the pin 30 is inserted. Then, the 1st hole 11 is covered with the adhesive tape 40, and both the single tubes 10 and 10 are connected.
By repeating the above connection work, a pipe having a required length is obtained.
[0024]
When the connecting portion has such a configuration, as in the conventional screw type, foreign matters such as sand enter the screw groove, so that the pipe does not rotate well, and there is no worry of troublesome connection.
Moreover, the present invention can connect the single tubes 10 and 10 only by the power of a human hand without using any tools.
[0025]
<C> Insert the borehole camera at the tip of the single tube 10 at the top of the insertion of the survey equipment, and insert it into the borehole.
When a CCD camera that projects only one direction of the borehole wall is used for this surveying instrument, the single tubes 10 to be joined may be marked continuously in a certain direction. As a result, it is possible to know the direction taken by the camera located behind the borehole from the ground.
Further, the joint surface of the single pipe 10 and the single pipe 10 may be filled with a sealing material or the like so as to be waterproof.
[0026]
The borehole camera placed in the back of the hole needs to be remotely controlled from the ground when performing various camera operations. When this operation is performed via a cable, the cable may be disposed in the single tube 10. As a result, it is possible to avoid the risk that the cable comes into contact with the hole wall and the outer surface of the cable is damaged or cut.
The single tube 10 is slowly inserted into the borehole and the borehole camera is lowered.
The single tube 10 is not necessarily prepared in a continuous state before the borehole camera is inserted into the hole, and may be joined together while the borehole camera is inserted into the borehole.
[0027]
<D> After disassembling the pipe, the single tubes 10, 10,... Are pulled up and the borehole camera is lifted to the ground.
After lifting the borehole camera, the adhesive tape 40 is peeled off as necessary, the pin 30 is removed from the hole 11, and the single tube 10 and the insert pipe 20 are disassembled.
As described above, the present invention can be easily disassembled by simply removing the adhesive tape 40 after use, so that the pipe is not cut during disassembly as in the conventional socket type, and is repeated at other locations. Can be used.
In addition to the borehole camera, a CCD camera or the like can be used as the survey device.
[0028]
【The invention's effect】
Since the joint structure of the pipe of the present invention is as described above, the following effects can be obtained.
<A> Since the structure is such that a hole is formed in a joint structure of a pipe made of a widely used member such as a single pipe, an insert pipe, and a pin, the manufacturing cost is low.
Moreover, the adjacent single pipes have strong strength because they are connected via an insert pipe having a larger cross section with pins arranged in directions different from the axial direction of the single pipes.
<B> Since the pin insertion port is covered with a sealing body to fix the pin, the pin can be easily removed just by removing the sealing body, and can be reused. In addition, since the operation is simple, the total cost is low from the point that it takes less time, and there is no worry of disconnection.
Furthermore, since there is no member which protrudes outside the single tube, there is no hindrance during use.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a pipe joint structure according to the present invention.
FIG. 2 is a cross-sectional view of a pipe joint structure.
FIG. 3 is a cross-sectional view of a pipe joint structure in the pipe axial direction.
[Explanation of symbols]
10 ·· Single tube 11 · · First hole 20 · · Insert pipe 21 · · Second hole 30 · · Pin 40 · · Sealing body

Claims (3)

A pipe joint structure consisting of two single pipes, an insert pipe fitted between adjacent single pipes, and a pin,
The insert pipe is inserted into the single pipe, and a first hole provided in a wall surface facing the single pipe end and a second hole provided through the insert pipe are communicated and connected with the pin. By connecting the adjacent single tubes,
Pipe joint structure. In the pipe joint structure according to claim 1,
The pin inserted into the first hole does not protrude from the peripheral surface of the single tube,
Pipe joint structure. In the joint structure of a pipe according to claim 1 or 2,
After inserting the pin through the first hole, the peripheral surface of the single tube including the first hole is covered with a sealing body,
Pipe joint structure.

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