JP4939028B2 - Propulsion pipe connection device - Google Patents

Description

  The present invention relates to a connecting device for a propulsion pipe used for constructing a pipe line in the ground. More specifically, the propulsion pipe is housed in a steel sheath or pipe, and a blade tip body provided at the tip of the propulsion pipe is used as a propulsion pipe. While drilling in the ground by rotating the steel pipe, the steel pipe and the propulsion pipe are simultaneously propelled into the ground, and after the penetration, the propulsion pipe is pulled out of the steel pipe and the pipe. In the double casing type pipe construction method in which the pipe is completed by inserting and laying the main pipe, and then filling the gap between the steel sheath and the main pipe with a filler, the propulsion pipes are connected and sequentially joined. The present invention relates to a connection device used for adding.

  The pipe construction by the above-mentioned double casing type pipe construction method is to install a propulsion unit in the starting shaft and set a steel sheath with a steel propulsion pipe of a predetermined length inside the propulsion unit. The tip of the cutting edge steel pipe and the eccentric tip pipe and the tip of the cutting edge propulsion pipe are provided with a cutting edge body projecting from the tip of the eccentric tip pipe. In addition to press-fitting, the blade body is rotated together with the propulsion tube to excavate the ground, and after the completion of the first steel sheath and the propulsion tube, the propulsion unit is separated from the steel sheath and the propulsion tube, and retracted. The second steel sheath and pipe and the propulsion pipe are set in the propulsion unit, the steel sheath and pipe are connected by welding, and the propulsion pipe is added by connection with a connecting device.

  Next, press-fitting with the propulsion device and rotation of the blade body promotes the steel pipe and tube, and repeats the above steps until the eccentric tube and blade body reach the reaching shaft. Remove the leading pipe, pull out only the propulsion pipe to the starting shaft while leaving the steel sheath and pipe, collect it on the ground while disconnecting this propulsion pipe, and then use a PVC pipe etc. in the steel sheath The main pipe is inserted and laid, and the steel casing and the gap between the pipe and the main pipe are filled with a filler to complete the double casing pipe.

  Conventionally, as shown in FIGS. 13 (a) and 13 (b), a propulsion pipe connecting device used for constructing a double casing type pipe as described above has a rectangular plate on the outer peripheral surface of one end of the propulsion pipe 1. A plurality of engagement pieces 2 are arranged at regular intervals along the circumferential direction, and a cylindrical shape in which one end portion of the other propulsion tube 1 to be connected to the outer periphery of the other end portion of the propulsion tube 1 is fitted. The fitting cylinder 3 is fixed so as to protrude from the other end.

  A portion of the fitting cylinder 3 protruding from the propelling tube 1 is provided with the same number of L-shaped engagement notches 4 as the engagement pieces 2. It consists of an axial guide 4a that is opened and a circumferential bent portion 4b that is bent from the inner end of the axial guide 4a. It is reinforced.

  The axial guide portion 4a and the circumferential bending portion 4b of the L-shaped engagement notch 4 have a width that allows the engagement piece 2 to be inserted and removed, and the inner end of the circumferential bending portion 4b is bent when the propulsion pipe 1 is connected. The engagement piece 2 along the direction becomes a rotation direction contact allowance 4c, and the engagement piece 2 and the L-shaped engagement notch 4 move relative to each other in the axial direction and rotate in the circumferential direction. Is engaged with the inner end abutting allowance 4c of the circumferentially bent portion 4, so that the propulsion pipes 1 and 1 are detachably connected, and the outer peripheral surface of one end of the propulsion pipe 1 is connected to the L-shaped engagement. A stopper member 6 that holds the engagement piece 2 in a non-rotating state is detachably attached to a position of the joint notch 4 facing the axial direction guide portion 4a.

  As shown in FIG. 13A, the connection of the propulsion pipe as described above is performed by moving one end of the subsequent propulsion pipe 1 closer to the other end of the preceding propulsion pipe 1 and moving the subsequent propulsion pipe 1 in the axial direction. Then, the engaging piece 2 enters the axial guide portion 4a of the L-shaped engaging notch 4, and at the same time, the outer connecting tube 7 and the inner connecting tube 8 provided at the ends of the two propulsion pipes 1 and 1 are fitted together in a watertight manner. After that, the propulsion tube 1 is rotated in the bending direction of the L-shaped engagement notch 4, and the engagement piece 2 is engaged with the inner end contact margin 4c of the circumferential bending portion 4b as shown in FIG. 13B. After that, if the stopper member 6 is attached to the outer surface of the propulsion pipe 1 facing the axial direction guiding portion 4a, both the propulsion pipes 1 and 1 are coupled in the axial direction and the rotational direction, and the propulsive force of the propulsion pipe 1 is The rotation transmitted by the abutment of the end surfaces of both the propulsion pipes 1 and 1 and the rotation given at the time of propulsion is the engagement piece 2 and the circumferential bending portion 4. It is transmitted by the abutment margin 4c of the inner end of.

  Further, when the connection between the two propulsion pipes 1 and 1 is released, after the stopper member 6 is removed, the propulsion pipe 1 is rotated so that the engagement piece 2 moves from the circumferential bent portion 4b to the axial guide portion 4a. It can be pulled out by giving axial movement.

  In the above-described double casing type pipe construction method, for the purpose of reducing construction costs, etc., it is required to reduce the diameter of the starting shaft and to reduce the size of the propulsion unit installed therein. 1 is required to be shortened.

  By the way, in the connection device for the propulsion pipe 1 described above, the contact allowance 4c between the engagement piece 2 and the inner end of the L-shaped engagement notch 4 ensures the transmission of the rotational force applied at the time of propulsion in order to transmit the rotation. Accordingly, the engagement piece 2 needs to have a long length L along the axial direction of the propulsion pipe 1 so that the strength of the contact allowance 4c can be sufficiently secured.

  As described above, when the length L of the engagement piece 2 becomes longer, the width of the circumferential bent portion 4b formed in the fitting tube 3 becomes wider, and as a result, the fitting tube 3 protrudes from the propelling tube 1. The length of the propulsion tube 1 becomes longer, and the entire length of the propulsion tube 1 becomes longer.

  However, simply shortening the length of the propelling pipe 1 while keeping the structure of the conventional connecting device as it is, the number of times of connection during the propulsion of the propelling pipe 1 is increased, the construction becomes complicated, and the work efficiency is remarkably increased. At the same time, the increase in the number of connecting devices makes it impossible to achieve a reduction in construction cost. For this reason, the increase in the number of times of connection work is suppressed as much as possible, and the propulsion pipe 1 is within a proper length range. It is desirable that the diameter of the starting shaft can be reduced by shortening the length.

  Accordingly, an object of the present invention is to connect a propulsion pipe that can shorten the projection length of the fitting tube from the propulsion pipe in the connection device for the propulsion pipe, and can shorten the entire length of the propulsion pipe accordingly. To provide an apparatus.

In order to solve the above problems, the present invention provides a plurality of engagement pieces along the circumferential direction on the outer peripheral surface of one end of the propulsion pipe, and is not connected to the outer periphery of the other end of the propulsion pipe. The fitting tube that fits one end of the mating propulsion tube is fixed so that it protrudes from the other end, and the portion protruding from the propulsion tube of the fitting tube opens at the tip edge of the fitting tube The number of L-shaped engagement notches comprising an axial direction guiding portion and a circumferential bent portion that is bent from the inner end of the axial direction guiding portion is equal to the number of the engagement pieces. By connecting the notches relative to each other in the axial direction and rotating in the circumferential direction, they are engaged to connect the propulsion pipe, and at the outer peripheral surface of one end of the propulsion pipe, the L-shaped engagement notch Removable stopper member that keeps the engagement piece in a non-rotating state at the position facing the axial direction guide The connecting device of the propulsion tube as attached, the tip outer periphery of the fitting tubular is reinforced by the ring-shaped strip fitted around, the stopper member, a ring-shaped outer peripheral surface of one end of the propulsion tube connected A configuration in which the L-shaped engagement notch is prevented from coming off from the axial direction guiding portion by being detachably fixed with a bolt at a position closer to the inner side than the front end edge of the band plate is adopted.

  An outer connecting cylinder and an inner connecting cylinder at one end of the propulsion pipe are provided to fit inside and outside at the inner position of the fitting cylinder when the propulsion pipe is connected. You may make it seal a fitting surface watertight.

In addition, a plurality of engagement pieces are provided along the circumferential direction on the outer peripheral surface of one end of the propulsion pipe, and one end of the mating propulsion pipe is connected to the outer periphery of the other end of the propulsion pipe The fitting cylinder is fixed so as to protrude from the other end, and the axial guide part that is opened at the tip edge of the fitting cylinder is formed on the protruding part of the fitting cylinder and the axial guide part. The number of engagement notches made up of circumferentially bent portions that are bent from the inner end of each of the engagement pieces is equal to the number of the engagement pieces, and the engagement pieces and the engagement notches are relatively moved in the axial direction and rotated in the circumferential direction. Thus, in the propulsion tube connecting apparatus in which the two are engaged to connect the propulsion tube, an outer connecting tube whose cross-sectional shape extends linearly in the axial direction at one end of the propulsion tube, and the propulsion tube Inner connection that fits inward to the outer connection tube of the mating propulsion tube that connects to the other end The provided, fixed to the outer peripheral surface of the outer connecting tube side of the propulsion tube the engaging piece, in which a structure fixed to the outer peripheral surface of the inner connecting tube side of the propulsion tube the fitting cylinder.
Here, in the propulsion pipe, a short pipe having an outer diameter equal to that of the main body is connected to both ends of the main body using a steel pipe by welding, and the tip of the short pipe positioned at one end portion extends linearly in the axial direction. A plurality of engaging pieces are welded and fixed at regular intervals in the circumferential direction from the outer connecting cylinder to the outer peripheral surface of the short pipe, and the tip of the short pipe located at the other end becomes the inner connecting cylinder. The fitting cylinder is welded to the outer diameter of the short pipe provided with the inner connection cylinder .

  The engagement piece is formed in an L shape in which the axial linear portion and the circumferential linear portion are bent at a right angle, and the axial guide portion of the L-shaped engagement notch is an opening through which the entire circumferential length of the engagement piece passes. The circumferential bent portion has a width and a circumferential length in which the circumferential linear portion can be accommodated, and a rotational contact amount between the engagement piece and the L-shaped engagement notch is L-shaped. In the joint notch, there are two places, that is, the rotation direction side edge of the axial direction guiding portion and the inner end of the circumferential bending portion.

  In this way, by using the rotation direction side edge of the axial direction guide portion as the rotation direction contact margin of the engagement piece, the L-shaped engagement cut formed in the width of the circumferential linear portion of the engagement piece and the fitting cylinder The width of the circumferentially bent portion of the notch can be reduced. As a result, the length of the fitting tube protruding from the propulsion tube is shortened, and the entire length of the propulsion tube can be shortened accordingly.

According to the present invention, the outer periphery of the end of the fitting tube is reinforced with the outer ring-shaped strip, and the stopper member is positioned on the outer peripheral surface of one end of the connected propelling tube on the inner side of the tip edge of the ring-shaped strip. Since it is secured to the position near the axial guide part of the L-shaped engagement notch by removably fixing it with a bolt, the connection state of the propulsion pipe can be reliably maintained.

In addition, an outer connecting tube and an inner connecting tube are provided at one end of the propelling tube and an inner connecting tube at the other end so as to fit inside and outside at the inner position of the fitting tube when the propelling tube is connected. Since the fitting surface is sealed, the connecting portion of the propulsion pipe can be watertight.

  Furthermore, when an outer connecting tube is provided at one end of the propelling tube and an inner connecting tube is fitted at the other end so as to fit inside and outside, the inner connecting tube fits inside the connecting tube, and the propulsion tube end of the outer connecting tube The projecting length from the portion can be shortened, thereby contributing to the shortening of the propulsion pipe.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  In the first embodiment of FIGS. 1 to 8, FIGS. 1 and 2 show the initial construction state at the starting shaft in the double casing type pipe construction method, and the propulsion device 12 is installed in the starting shaft 11. A steel sheath 14 that is installed and contains a steel propelling tube 13 of a predetermined length is set in the propulsion unit 12, and an eccentric tip conduit 15 and the most advanced propulsion are provided at the tip of the state-of-the-art steel sheath 14. A cutting edge main body 16 protruding from the eccentric tip conduit 15 is provided at the tip of the pipe 13, and the steel sheath 14 and the propelling pipe 13 held by the clamp mechanism 17 of the propulsion unit 12 are simultaneously press-fitted into the ground by the action of the jack 18. At the same time, without rotating the steel sheath 14, the blade body 16 is rotated together with the propulsion tube 13 to excavate the ground, and after the first steel sheath 14 and the propulsion tube 13 are completely propelled, the propulsion unit 12 is Retracted from steel sheath 14 and propulsion tube 13 The second steel sheath 14 and the propulsion tube 13 are set in the propulsion unit 12, the steel sheath 14 is connected by welding, the propulsion tube 13 is added by connection by the connecting device 19, and the eccentric tip conduit 15 The above steps are repeated until the cutting edge body 16 reaches the reaching shaft.

  After confirming the arrival, the eccentric tip pipe 15 is removed, the steel pipe 14 is left in the ground, and only the propulsion pipe 13 is pulled out to the start shaft 11, and the propulsion pipe 13 is disconnected and recovered on the ground. Thereafter, a main pipe (not shown) using a PVC pipe or the like is inserted into the steel sheath 14 and connected, and the gap between the steel sheath 14 and the main pipe is filled with a filler. Complete the pipeline of the heavy casing.

  As shown in the sectional views of FIGS. 3 and 7, the propulsion pipe 13 used in the double casing type pipe construction method is a short pipe 13b having an outer diameter equal to that of the main body at both ends of the main body 13a using a steel pipe. And 13c are connected to the coaxial center by welding, and the connecting device 19 has a plurality of engaging pieces 20 arranged at regular intervals along the circumferential direction on the outer peripheral surface of the short tube 13b located at one end. The fitting cylinder 21 fitted with one end of the mating propulsion pipe 13 to be connected to the outer periphery of the other short pipe 13c is fixed so as to protrude from the other end. A ring projecting from the propelling tube 13 is provided with the same number of L-shaped engagement notches 22 opened at the tip edge of the fitting tube 21 as the engagement piece 20, and the outer periphery of the tip of the fitting tube 21 is fitted outside. It has a structure reinforced with a strip-shaped strip 23.

  As shown in FIG. 6B, FIG. 7 and FIG. 8, the inner connecting tube 24 is connected to the short tube 13b located at one end of the propulsion tube 13, and the outer connecting tube 25 is connected to the short tube 13c located at the other end. By connecting the propulsion pipe 13 so as to fit inside and outside at the inner position of the fitting cylinder 21, the fitting surfaces of the inner connecting cylinder 24 and the outer connecting cylinder 25 are sealed in a watertight manner with a sealing material 26, The propulsive force is transmitted at the end surface where the connecting cylinder 24 and the outer connecting cylinder 25 abut, and the propelling pipe 13 is connected in a watertight manner.

  The L-shaped engagement notch 22 includes an axial guide portion 22a that opens at the front end edge of the fitting tube 21, and a circumferential bent portion 22b that is bent at a right angle from the inner end of the axial guide portion 22a. The engagement piece 20 is formed in an L shape corresponding to the L-shaped engagement notch 22 so that the engagement piece 20 can be engaged with and disengaged from the L-shaped engagement notch 22. The propulsion pipe 13 is connected by engaging the two in the axial direction relative to 22 and rotating in the circumferential direction.

  The engagement piece 20 is formed in an L shape in which an axial linear portion 20a and a circumferential linear portion 20b connected to the distal end side thereof are bent at a right angle, and the axial guide portion 22a of the L-shaped engagement notch 22 is engaged. The circumferential length of the piece 20 has an opening width through which the circumferential bending portion 22b has a width and a circumferential length in which the circumferential linear portion 20b can be accommodated. In the L-shaped engagement notch 22, The contact amount of the engagement piece 20 in the rotational direction is two locations, that is, the contact amount 22c by the rotation direction side edge of the axial direction guide portion 22a and the contact amount 22d located at the inner end of the circumferential direction bent portion 22b. Yes.

  Thus, in the engagement piece 20 and the L-shaped engagement notch 22, when the contact allowance in the rotation direction is set to the two contact allowances 22c and 22d as described above, the shaft that has not been used conventionally is used. The rotation direction side edge of the direction guiding portion 22a can be used as a rotation direction contact margin 22c of the engagement piece, and the contact margin 4c of the conventional engagement piece 2 and the L-shaped engagement notch 4 shown in FIG. When securing the same rotational transmission force, the width of the circumferential linear portion 20b of the engagement piece 20 is equal to the rotation direction abutting margin 22c of the engagement piece 20 corresponding to the rotation direction side edge of the axial direction guide portion 22a. The width | variety of the circumferential direction bending part 22b formed in the fitting cylinder 21 can be narrowed.

  As described above, by narrowing the width of the circumferential bent portion 22b of the L-shaped engagement notch 22, the length of the fitting tube 21 protruding from the propulsion tube 13 can be designed to be short. The overall length can be shortened accordingly.

  Engagement engaged with the L-shaped engagement notches 22 on the outer peripheral surface of one end portion of the propulsion pipe 13 at positions facing the axial direction guide portions 22a of the L-shaped engagement notches 22 at a plurality of positions when connected. A stopper member 27 that holds the rotation-preventing state of the piece 20 is detachably attached.

  As shown in FIG. 7, the stopper member 27 and a planar rectangular shape that fits in the remaining space of the axial guide portion 22 a to which the axial linear portion 20 a of the engagement piece 20 engages, and fits with the outer diameter of the propulsion pipe 13. The stopper 21 is formed in a plate shape having a thickness that fits in the gap between the inner diameters of the cylinder 21, and a retaining member 28 such as a bolt is detachably attached to the outer surface of the stopper member 27. By coming into contact with the edge, the L-shaped engagement notch 22 is prevented from coming off from the axial direction guiding portion 22a.

  Further, the stopper member 27 of the second embodiment shown in FIGS. 9 and 10 is an outer peripheral surface of one end portion of the connected propulsion pipe 13, and from the front end edge of the ring-shaped strip 23 when the propulsion pipe 13 is connected. A screw hole 29 is provided at a position closer to the inner side, and a stopper member 27 inserted into the axial direction guide portion 22a is connected to the screw hole 29 from a hole 31 of a bracket 30 welded to the stopper member 27 with a bolt 32. The mounting structure is such that it is detachably fixed to the axial direction guiding portion 22a of the shape engaging notch 22.

  In the third embodiment shown in FIGS. 11 and 12, an outer connecting tube 25 is provided on the short tube 13b located at one end of the propelling tube 13, and an inner connecting tube 24 is provided on the short tube 13c located on the other end. Further, when the propulsion pipe 13 is connected, it is provided so as to fit inside and outside at the inner position of the fitting cylinder 21, and the fitting surfaces of the outer connection cylinder 25 and the inner connection cylinder 24 are sealed with a sealing material 26 in a watertight manner. .

  When the inner connection cylinder 24 is arranged so as to be accommodated inside the fitting cylinder 21 in this way, the protruding length of the outer connection cylinder 25 is shortened, so that the inner connection cylinder 24 in the embodiment shown in FIG. There is an advantage that the entire length of the propelling tube 13 can be shortened by the amount.

  As shown in FIGS. 1 and 2, the propulsion pipe 13 is provided with a protective roller 33 on the outer periphery of the main body 13a so that the steel pipe and the rotation in the pipe 14 and the movement in the axial direction can be smoothly obtained. Can do.

  The connecting device according to the present invention has the above-described configuration. Next, a method for connecting the propulsion pipe in the double casing type pipe construction method will be described.

  In order to connect the propulsion pipe 13 during the construction of the double casing type pipe construction method, one end of the subsequent propulsion pipe 13 as a connection thread as shown in FIG. 3, FIG. 9 (a), FIG. Is moved closer to the other end of the preceding propulsion pipe 13 propelled into the ground, the phase of the engagement piece 20 is aligned with the axial direction guiding portion 22a of the L-shaped engagement notch 22, and the subsequent propulsion pipe 13 is advanced in the axial direction. The one end of the subsequent propulsion pipe 13 is fitted into the fitting cylinder 21, and the engagement piece 20 is inserted into the axial direction guide portion 22a of the L-shaped engagement notch 22, and the two propulsion pipes 13, After the outer connecting tube 25 and the inner connecting tube 24 provided at the end of 13 are fitted in a watertight manner, the subsequent propulsion tube 13 is rotated in the bending direction of the circumferential bending portion 22b.

  Next, as shown in FIGS. 4A and 9B, the engagement piece 20 is engaged with the L-shaped engagement notch 22 and then connected as indicated by the arrow in FIG. 4B. The entire propulsion pipe 13 is pulled out slightly from the inside of the steel sheath 14 and the part of the fitting cylinder 21 is exposed to the outside from the end of the steel sheath 14 and is continued in this state as shown in FIG. If the stopper member 27 is attached to the outer surface of the propulsion pipe 13 facing the axial direction guide portion 22a, the propulsion pipes 13 and 13 are coupled in the axial direction and the rotational direction, and thereafter, FIG. As in a), if the entire connected propulsion pipe 13 and the subsequent steel sheath 14 are advanced, and the preceding steel sheath 14 in the ground and the end of the subsequent steel sheath 14 are connected by welding, Connection work is completed.

  The propulsive force of the propulsion pipe 13 that is press-fitted into the ground is transmitted by abutment between the end faces of the two propulsion pipes 13, and the rotation of the subsequent propulsion pipe 13 that is given by the propulsion unit 12 during propulsion is caused by the engagement pieces 20 and It is transmitted to the preceding propulsion pipe 13 by the contact allowances 22c and 22d of the shape engagement notch 22.

  Further, when disconnecting the two propulsion pipes 13 and 13 in order to remove the propulsion pipe 13 from the steel sheath 14, the stopper member 27 is removed with the connecting device 19 positioned in the starting shaft 11. After that, one end of the propelling tube 13 comes out from the fitting tube 21, and the propulsion tube 13 rotates and pivots so that the engagement piece 20 moves from the circumferential bending portion 22b to the axial guiding portion 22a. What is necessary is just to give the movement of a direction.

Longitudinal side view showing the initial construction state at the starting shaft in the double casing type pipe construction method Longitudinal side view showing the state where the steel sheath and the pipe and the propulsion pipe are added at the initial construction at the starting shaft in the double casing type pipe construction method The longitudinal side view before the connection which shows the connection apparatus of 1st Embodiment (A) The vertical side view of the engagement state of the engagement piece which shows the connection apparatus of 1st Embodiment, and an L-shaped engagement notch, (b) is the state which pulled out the propulsion pipe from steel sheaths and pipes a little. Vertical side view (A) is a vertical side view of the engagement state of the engagement piece and the L-shaped engagement notch showing the connection device of the first embodiment and the attachment state of the stopper member, and (b) is a view of the propulsion pipe and the steel sheath pipe. Longitudinal side view showing connection completion (A) is a longitudinal front view taken along arrow VIa-VIa in FIG. 5 (b), and (b) is a longitudinal side view showing an enlarged main part taken along arrow VIb-VIb in FIG. 5 (b). A longitudinal side view enlarging the main part of arrows VII-VII in FIG. The disassembled perspective view which shows the connecting device of 1st Embodiment (A) The vertical side view before the connection which shows the connection apparatus of 2nd Embodiment, (b) is the engagement state which shows the connection apparatus of 2nd Embodiment, and the engagement state of an L-shaped engagement notch A longitudinal side view of the (A) is a longitudinal side view of the engagement state of the engagement piece and the L-shaped engagement notch showing the connection device of the second embodiment and the mounting state of the stopper member, and (b) is an arrow b-b in (a). An enlarged side view of the main part The longitudinal side view before the connection which shows the connection apparatus of 3rd Embodiment The vertical side view which expanded the connection completion state of the propulsion pipe and steel sheath which show the connection apparatus of 3rd Embodiment (A) is a longitudinal side view before connection showing a conventional connecting device, (b) is a longitudinal side view showing a connection completion state of a propulsion pipe and a steel sheath or pipe.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Propulsion pipe 2 Engagement piece 3 Fitting cylinder 4 L-shaped engagement notch 5 Ring-shaped strip 6 Stopper member 11 Starting shaft 12 Propulsion machine 13 Propulsion pipe 14 Steel sheath pipe 15 Eccentric tip conduit 16 Cutting edge main body 17 Clamp mechanism 18 Jack 19 Connecting device 20 Engaging piece 21 Fitting cylinder 22 L-shaped engagement notch 23 Ring-shaped strip 24 Inner connecting cylinder 25 Outer connecting cylinder 26 Sealing material 27 Stopper member 29 Screw hole 30 Bracket 31 Hole 32 Bolt 33 Protective roller

Claims (3)

A plurality of engaging pieces are provided along the circumferential direction on the outer peripheral surface of one end of the propulsion pipe, and the other end of the propulsion pipe is fitted with the one end of the mating propulsion pipe to be connected. The joint tube is fixed so as to protrude from the other end portion, and an axial direction guiding portion that is opened at the leading edge of the fitting tube at a portion protruding from the propelling tube of the fitting tube, and an inner portion of the axial direction guiding portion The same number of L-shaped engagement notches consisting of circumferential bent portions that are bent from the end are provided in the same number as the engagement pieces, and the relative movement of the engagement pieces and the L-shaped engagement notches in the circumferential direction and the circumferential direction. The propulsion pipe is connected by engaging both of them, and the engagement piece rotates around the outer peripheral surface of one end of the propulsion pipe at the position facing the axial guide portion of the L-shaped engagement notch when connected. In the propulsion pipe connecting device in which the stopper member that holds the stopped state is detachably attached,
The outer periphery of the end of the fitting tube is reinforced with a ring-shaped strip that fits outside, and the stopper member is positioned closer to the inner side than the tip edge of the ring-shaped strip on the outer peripheral surface of one end of the connected propelling tube. In addition, the propulsion pipe connecting device is characterized in that it is secured from the axial guide portion of the L-shaped engagement notch by being detachably fixed with a bolt .   An outer connecting cylinder and an inner connecting cylinder at one end of the propulsion pipe are provided to fit inside and outside at the inner position of the fitting cylinder when the propulsion pipe is connected. 2. The propulsion pipe connecting device according to claim 1, wherein the fitting surface is sealed. A plurality of engaging pieces are provided along the circumferential direction on the outer peripheral surface of one end of the propulsion pipe, and the other end of the propulsion pipe is fitted with the one end of the mating propulsion pipe to be connected. The joint tube is fixed so as to protrude from the other end portion, and an axial direction guiding portion that is opened at the leading edge of the fitting tube at a portion protruding from the propelling tube of the fitting tube, and an inner portion of the axial direction guiding portion The number of engagement notches comprising circumferentially bent portions that bend continuously from the end is equal to the number of the engagement pieces, and by the relative axial movement and rotation of the engagement notches and the engagement notches, In the propulsion pipe connecting device in which both are engaged to connect the propulsion pipe,
An outer connection tube whose cross-sectional shape extends linearly in the axial direction at one end of the propulsion tube, and an inner connection that fits inwardly into the outer connection tube of the mating propulsion tube that is connected to the other end of the propulsion tube A propulsion pipe connecting device in which a cylinder is provided, the engagement piece is fixed to the outer peripheral surface of the propulsion pipe on the outer connection cylinder side, and the fitting cylinder is fixed to the outer peripheral surface of the propulsion pipe on the inner connection cylinder side.

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