JP2004176404A - Cylindrical component capable of changing tip diameter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylindrical component capable of changing a tip diameter and elastically shrinking and expanding a diameter on a tip side of a peripheral wall. <P>SOLUTION: The peripheral wall of the cylindrical member in which a space is formed on an inner side is formed by arranging many fins in which side end sides are slidably joined alternately or sequentially in a circular shape so that the diameter on the tip side of the peripheral wall is elastically contracted or expanded. The fins are curved or bent in the outer peripheral direction, and the cylindrical member has a conically tubular shape in which the tip side is expanded on the whole. A side end of the fin is slidably joined with the other adjacent side end. The adjacent fins are partially and mutually overlapped in the peripheral direction to form the peripheral wall sealed with an outer peripheral part on the whole. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a tubular member whose tip diameter can be changed.
[0002]
[Prior art]
[Non-Patent Document 1] The Japan Anchor Association homepage The above website (http://www.japan-anchor.or.jp/) has an anchor body conventionally installed in the ground and an anchor head attached to a structure. A ground anchor method is described, in which the landslides are connected by a tensile member called a tendon, and the sliding of the landslide mass is stopped by the pull-out resistance of the anchor body to stabilize the structure.
[0003]
The ground anchor method has a feature that, by applying prestress to tendon, it is possible to improve the effect of suppressing slippage at a stage where tendon elongation is small, that is, at a stage where the amount of deformation due to landslide or the like is small. It is widely used in the field of civil engineering and construction, such as prevention of overturning and lifting of structures, temporary retaining and earth retaining.
[0004]
When the ground anchor method is briefly described according to the ground anchor construction procedure on the website,
1. As shown in FIG. 13 (a), a casing pipe D is drilled from a structure (retaining wall) A formed on the unstable ground surface to a ground (base) B to be fixed by a drilling machine or the like. Insert 2. As shown in FIG. 13B, grout material G made of cement milk or mortar is filled in casing pipe D, and tendon F is further inserted. 3. As shown in FIG. 13 (c), a part of the casing pipe D is pulled out, grout material G is injected under pressure, an anchor body G 'is formed on the base B, and the casing is pulled out. As shown in FIG. 13 (d), the tendon F is prestressed between the anchor body G 'and the structure A, and the unstable ground is formed by the base B and the structure A via the anchor body G'. Compression of the layers.
[0005]
[Problems to be solved by the invention]
However, in the above-mentioned ground anchor method, since the grout material G in the casing cannot be removed, when the casing is pulled out, a gap between the tendon and the portion of the unstable ground layer to be compressed cannot be secured. Has a problem that the unstable ground layer can hardly be compressed due to the prestress of tendon F.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the cylindrical member capable of changing the tip diameter according to the present invention has a large number of fins that are joined alternately or sequentially so that the side ends thereof are slidably arranged in a circular shape so as to form a continuous peripheral wall. The first feature is that the peripheral wall has a structure in which the diameter on the distal end side can be elastically reduced or enlarged, and a space is formed inside the distal end side of the peripheral wall.
[0007]
The second feature is that each fin is curved or bent in the outer peripheral direction, and as a whole, has a conical cylindrical shape whose tip end side is enlarged.
[0008]
Third, a side end of each fin is slidably joined to another adjacent side end.
[0009]
Fourthly, the adjacent fins are partially overlapped and joined to each other in the circumferential direction to form a peripheral wall that is hermetically sealed with the outer peripheral portion as a whole.
[0010]
Fifth, the present invention is characterized in that a ring-shaped regulating member which is extrapolated to the outer peripheral side of the peripheral wall and expands / contracts the diameter to increase / decrease the diameter at the distal end side of the peripheral wall is provided.
[0011]
Sixth, a cylindrical regulating member is provided on the outer peripheral side of the peripheral wall so as to be slidable along the axis of the peripheral wall, and is inserted into and removed from the peripheral wall to enlarge or reduce the diameter of the distal end side of the peripheral wall. It is characterized by having been provided.
[0012]
Seventh, when the fin slides in a cylindrical tube or hole in the axial direction, the fin 6 guides the adhering matter on the inner peripheral surface of the cylindrical body into the inner peripheral wall when the fin slides in the axial direction. The distal end portion is curved or bent in the axial direction, the distal end portion is in contact with the inner peripheral surface of the cylinder or the hole, and the fin 7 guides the axial movement in the cylinder or the hole during the feeding operation. Features.
[0013]
Eighth, a hollow pipe that communicates with the space inside the peripheral wall and discharges extraneous matter introduced inside the peripheral wall to the outside of the cylinder or the hole is attached to the base end side of the tubular member 3. I have.
[0014]
Ninth, the casing is a casing pipe D in the ground anchor method.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a side view of a discharge pipe 1 formed by using a tubular member of the present invention to discharge and extract grout material from a casing pipe of a ground anchor method, wherein the discharge pipe 1 is a tip of a pipe 2. Has a structure in which the tubular member 3 of the present invention is attached.
[0016]
Then, in the work process of FIG. 13 (c) of the ground anchor method described above, after the grout material G is injected under pressure and before the casing D is extracted, the main discharge pipe 1 is inserted into the casing pipe D as shown in FIG. By inserting, the grout material G in the casing pipe D can be extracted, and after the casing D is extracted, the discharge pipe 1 covers the outer periphery of the tendon F, and the tendon F and the pipe 2 of the discharge pipe 1 are removed. Is formed between them.
[0017]
At this time, the discharge pipe 1 is on the unstable ground layer side, but since the tendon F and the discharge pipe 1 are not integrated, the gap around the tendon F becomes a gap between the tendon F and the unstable ground layer. Thereby, the unstable ground layer is compressed between the base B and the structure A by the prestress applied to the tendon F, and an effective ground anchor method is performed.
[0018]
Next, the structure of the tubular member 3 will be described. As shown in FIG. 3, the cylindrical member 3 has two types of fins 6 and 7 on the end surface side of a cylindrical main body 4 attached to the pipe 2 so that the adjacent fins are mutually adjacent to the other side end. They are slidably overlapped with each other, joined together, sealed as a whole with the outer peripheral portion, and are arranged circularly so as to form a peripheral wall having a space formed inside.
[0019]
As shown in FIG. 4, each fin 6, 7 has an outer peripheral side of the pipe 2 at an intermediate portion so that the diameter of a circle C <b> 1 where the tip of the fin 6 is a chord is larger than the outer diameter of the main body 4. The main body 4 is bent or curved on the outer peripheral side, and has a conical cylindrical shape with the distal end side enlarged as a whole.
[0020]
One type of the fins 7 is such that the tip side is located at the center of the main body 4 such that the diameter of the circle C2 where the tip of each fin 7 is a chord is smaller than the diameter of the above C1 and larger than the outer diameter of the main body 4. It is bent or curved toward.
[0021]
The entirety of the cylindrical member 3 is made of resin by molding all of the parts 4, 6 and 7 constituting the cylindrical member 3 with resin, and FIGS. 4 (a) and 4 (b). As shown in (1), the adjacent fins slide with each other, and the diameter of the distal end side of the tubular member 3 (the distal end side of both fins 6, 7) is elastically reduced or enlarged.
[0022]
Next, the structure of the main body 4 of the tubular member 3 will be described. As shown in FIG. 5, the main body 4 has a hollow cylindrical shape, and fin mounting projections 8 for inserting and supporting the one type of fin 7 on one end face 4a are circularly arranged at a predetermined pitch. It is provided. At this time, the fin mounting projection 8 has a plate-like shape, and has a structure in which a slit 9 for inserting the fin 7 is formed on the tip side.
[0023]
A fin mounting projection 11 for mounting the other type of fin 6 is formed between the fin mounting projections 8, and the fin 6 can be inserted and mounted between opposing adjacent surfaces of the adjacent fin mounting projections 8. It has become.
[0024]
On the other hand, a step 13 (see FIG. 9) is formed on the inner peripheral surface of the main body 4 so that the inner diameter d1 (see FIG. 9) on the fin mounting protrusion 8 side is equal to the inner diameter d2 on the opposite side of the fin mounting protrusion 8 (see FIG. 9). 9).
[0025]
Next, the structure of the fin 7 will be described. As shown in FIG. 6, the fin 7 is provided with a rib 16 in the longitudinal direction at the center of the back surface of the base plate 14 curved or bent in a dogleg shape, and the upper end of the rib 16 at one end (tip) side. A plate 17 is fixed parallel to the base plate 14 so as to protrude from the tip of the base plate 14.
[0026]
A configuration in which the distal end of the plate 17 is curved or bent toward the base plate 14 outside the distal end of the base plate 14, and a rib 18 reaching the rear surface of the base plate 14 is provided on the front surface of the plate 17. Has become.
[0027]
At this time, both the base plate 14 and the plate 17 gradually increase in width toward the distal end of the base plate 14 up to the distal end portion of the base plate 14, and further, only the plate 17 has a distal end extending from the portion facing the distal end of the base plate 14. Is gradually reduced toward the tip, and the plate 17 is sharpened. With the above configuration, the slits 19 are formed by the plate 17 and the base plate 14 on both left and right sides of the rib 16 in the guide fin 7.
[0028]
As shown in FIGS. 7A and 7B, the other end (base end) of the rib 16 is inserted into the slit 9 of the fin mounting projection 8 from inside the main body 4 so that the fin 7 is inserted. Are protruded from the main body 4 in a state of being curved or bent in the outer circumferential direction of the main body 4, and are arranged in a circle at a predetermined pitch on the end 4 a side of the main body 4.
[0029]
At this time, the curved or bent portion of the fin 7 in the outer circumferential direction of the main body 4 is formed at the top of the curved or bent portion of the plate 17, and the tip of the plate 17 is moved from the top to the center of the main body 4 by the shape of the plate 17. It will bend or bend towards it.
[0030]
Next, the structure of the fin 6 will be described. As shown in FIG. 8, the fin 6 is provided with a rib 22 in the longitudinal direction from the curved portion toward one end (base end) side on the back surface of the raking plate 21 bent or curved in a U-shape. The parallel plate 23 is fixed to the upper surface of the rib 22 in parallel with the scraping plate 21. Thereby, a slit 24 is formed on the left and right sides of the rib 22 by the parallel plate 23 and the raking plate 21.
[0031]
Then, as shown in FIGS. 7A and 7C, the fins 6 are bent or bent by inserting the fin mounting projections 8 adjacent to the respective slits 24, so that the fins 6 have the distal ends outside the main body 4. It is attached so as to bend or bend toward the main body 4 to protrude.
[0032]
As a result, the fins 6 are located between the fins 7 and arranged in a circle at a predetermined pitch on the end 4a of the main body 4, that is, both types of the fins 6, 7 are alternately arranged in a circular shape. FIG. 7B illustrates the fins 7 by solid lines and the fins 6 by imaginary lines, and FIG. 7C illustrates the fins 7 by imaginary lines and the fins 6 by solid lines.
[0033]
At this time, the tip positions of the fins 6 substantially coincide with the tip positions of the base plate 14 in the fins 7, and by attaching the fins 6 and the fins 7 to the main body 4, the tip portions of the plates 17 of the fins 7 are It protrudes from the tip of the base plate 14 and curves or bends toward the center of the main body 4 as described above.
[0034]
As a result, the tip of the cylindrical member 3 has a ridge formed by the tip of the plate 17 and a valley formed by the ridgeline of the tip of the adjacent plate 17 and the tip of the plate 21, and the base of the ridge (the valley portion). The tip has a substantially maximum diameter, and the peak is bent or curved inward toward the tip.
[0035]
As shown in FIG. 7, when the fin 6 is attached to the main body 4, both ends of the plate 21 are inserted into the slits 19 of the adjacent fin 7, and the plate 21 and the plate 17 21 and the ribs 16 of the guide fins 7 overlap with a gap provided between them.
[0036]
At the base end side of the rib 16 in the fin 7, a portion projecting from the outer peripheral surface of the fin mounting projection 8 in a state where the rib 16 is inserted into the slit 9 of the fin mounting projection 8 is prevented from coming off in the radial direction. A projection 26 having an arrow shape in plan view is provided. Further, an engaging portion 27 is provided on a portion of the fin 6 opposed to the protruding portion 26 when the fin 6 is attached to the main body 4 so as to engage with the protruding portion 26 and prevent the protruding portion 26 from coming off to the front end side. I have.
[0037]
Thus, the projections 26 prevent the fins 7 from coming off the fin mounting projections 8 in the radial direction, and also prevent the fins 7 from coming off to the tip end side by the engagement of the engaging portions 27 and the projections 26. Therefore, the tubular member 3 does not decompose during use.
[0038]
The cylindrical member 3 is configured as described above, and the outer diameter of the distal end side is reduced smoothly until the side end surface 21a of the plate 21 of the fin 6 and the rib 16 of the fin 7 abut. The insertion of the fins 7 into the fin mounting projections 8 is relatively loose (rack is large), and the resin fins 6 and 7, the guide fin mounting projections 8, and the elastic force of the main body 4 make the fin 7 complicated. The outer diameter of the tubular member 3 is smoothly expanded and returned from the reduced state by the minimum free-fitting support of the fins 7 without forming a support structure for the respective fins 6 and 7, The outer diameter of the distal end side of the member 3 expands and contracts elastically and smoothly.
[0039]
Further, since the peripheral wall of the cylindrical member 3 is formed by the plate 21 of the fin 6 and the base plate 14 and the plate 17 of the fin 7, the plate 21 and the base plate 14 overlap in the initial state, so that When the diameter is increased or decreased, the peripheral wall does not become discontinuous, and the outer diameter of the cylindrical member 3 is increased or reduced while maintaining the closed state except at both ends.
[0040]
The discharge pipe 1 is constructed by inserting the pipe 2 into the main body 4 from the end opposite to the fin mounting projection 8, and abutting the tip of the pipe 2 against the end face of the step 13 to fix the same. The tubular member 3 is positioned concentrically with the pipe 2 at the end of the pipe 2, and the inside of the peripheral wall of the tubular member 3 and the inside of the pipe 2 are communicated.
[0041]
With the above structure, in the ground anchor method using the discharge pipe 1 as described above, when scraping the grout material from the casing pipe D, first insert the pipe 2 into the tubular member 3 as described above, and fix both. As shown in FIG. 9, the discharge pipe 1 is inserted into the casing pipe D into which the grout material G is inserted, and is moved in the axial direction of the pipe portion 2.
[0042]
At this time, the maximum diameter of the cylindrical member 3 is elastically reduced such that the curved or bent top portion is in contact with the inner peripheral surface of the casing pipe D, and the tip of the fin 6 constituting the maximum diameter portion is formed inside the casing pipe D. The grout material G, which is an attached matter on the peripheral surface D ′ side, is introduced and guided into the inside of the peripheral wall of the tubular member 3.
[0043]
At this time, the ridges of the ridges and valleys that curve or bend inside the tubular member 3 guide the grout material G and feed it into the tubular member 3 to thereby introduce the grout material G into the casing pipe D. The grout material G introduced into the tubular member 3 is efficiently introduced into the tubular member 3, and the grout material G introduced into the tubular member 3 passes through the gap SS between the pipe 2 and the tendon F. It is discharged outside from the end.
[0044]
At this time, even if there is a step due to the joining portion in the casing pipe D and there is a different diameter portion, the outer diameter of the tubular member 3 is reduced by the plate 21 of the fin 6 sliding in the slit 19 of the fin 7. As described above, the fin 7 smoothly expands and contracts, and the top of the fin 7 follows the inner peripheral surface D 'of the casing pipe D easily and smoothly.
[0045]
As a result, the outer diameter of the cylindrical member 3 is changed to a size along the inner diameter of the casing pipe D, and the cylindrical member 3 comes into contact with the inner peripheral surface of the casing pipe D, so that the grout material G in the casing pipe D can be smoothly discharged. . At this time, since the discontinuous portion does not exist on the peripheral wall of the tubular member 3 as described above, the grout material does not leak from the peripheral wall of the tubular member 3 during the discharge operation of the grout material G.
[0046]
In addition, since the fins 6 slide between the slits 19 of the fins 7, the slides of the fins 6 are guided by the slits 19, so that the cylindrical member 3 in which there is no gap in the peripheral wall is smoothly expanded and contracted.
[0047]
Since the scraping tube 1 is constituted by the pipe 2, the main body 4, the fins 6, and the fins 7 of the tubular member 3, it can be disassembled to easily replace each part, and can be compactly carried. can do.
[0048]
As described above, the scraping tube 1 can feed or scrape the attached matter on the inner peripheral surface side of the cylindrical body while contacting the inner peripheral surface as described above. In addition to the feeding and discharging of the material G, the present invention can also be used for the operation of removing deposits inside a chimney, a water pipe, a drain pipe of a sludge in a plant, and the like.
[0049]
On the other hand, the tubular member 3 can be inserted into a hole such as a well and positioned by the elastic force of the tubular member 3 (fins 6, 7) to be used as a base member of the packing member. For example, as shown in FIG. 10, the present invention can be used when a well is dug in a ground where a contaminated groundwater fluidized bed 32 and a high-quality groundwater fluidized bed 33 have a plurality of layers below a surface stratum 31.
[0050]
In this case, the tubular member 3 is inserted by a pipe-shaped pushing member (not shown) so that the tips of the fins 6 and 7 face the opening of the hole 30 or the bottom of the hole, and the contaminated groundwater flowing layer 32 and the high-quality groundwater flow. By positioning at a position corresponding to the boundary portion of the layer 33 and filling a portion corresponding to the contaminated groundwater in the hole 30 with mortar M or the like, it is possible to prevent the contaminated groundwater from entering the hole 30.
[0051]
At this time, when the cylindrical members 3 are sequentially inserted, the mortar M is injected before the next cylindrical member 3 is inserted, and when the next cylindrical member 3 is inserted, the upper side of the inserted cylindrical member 3 is inserted. By discharging the mortar M through the tubular member 3 and the pipe, the space between the two tubular members 3 can be filled with the mortar M.
[0052]
By inserting a pipe 34 of a well through each tubular member 3 and providing a strainer 36 at a portion corresponding to the high-quality groundwater fluidized bed 33, high-quality groundwater can be pumped from the pipe 34.
[0053]
On the other hand, as shown in FIG. 11, a ring (regulation member) 42 whose diameter can be enlarged or reduced by an actuator 41 is extrapolated to the outer peripheral side of the peripheral wall of the cylindrical member 3 and to the tip side of the fins 6 and 7. By increasing or decreasing the diameter of the ring 42, the diameter of the peripheral wall of the cylindrical member 3 on the distal end side can be enlarged or reduced.
[0054]
As shown in FIG. 12, the cylindrical member 3 is attached to the tip of the arm 43, and a cylindrical member (restriction member) 44 inserted into and removed from the peripheral wall is attached to the outer periphery of the arm 43 and the main body 4 by a thrust. The outer diameter of the outer peripheral wall of the cylindrical member 3 can be enlarged and reduced by inserting the cylindrical member 44 into and out of the peripheral wall so as to be slidably fitted through the bearing 45. .
[0055]
In this case, the cylinder member 44 is attached to the actuator 17 such as an electric cylinder, and is slid by the actuator 47. A sensor 46 is provided on the cylinder member 44 side or the arm 43 side, and the slide position of the cylinder member 44 can be controlled by the sensor 46.
[0056]
In any of the above cases, by controlling the operation of the actuators 41 and 47, it is possible to control the enlargement / reduction of the diameter of the peripheral wall at the front end side. The cylindrical member 3 can be used as a gripping device such as a robot hand for catching harvested or thinned-out products for agricultural work.
[0057]
【The invention's effect】
According to the structure of the present invention configured as described above, a large number of fins forming a continuous peripheral wall move in the direction of increasing or decreasing the diameter on the distal side, so that the diameter on the distal side smoothly expands or contracts. At this time, each fin is curved or bent in the outer peripheral direction, and by making the cylindrical member as a whole a conical cylindrical shape having an enlarged distal end side, the diameter can be reduced smoothly and the restoring force can be increased. .
[0058]
In addition, by making the side end of each fin slidably joined to the other adjacent side end, the diameter can be more smoothly enlarged and reduced, and particularly, the adjacent fins are mutually connected in the circumferential direction. By forming a peripheral wall that is sealed from the outer peripheral part as a whole by partially overlapping and joining together, it is possible to prevent a gap from being formed in the peripheral wall when the diameter is increased.
[0059]
By providing a ring-shaped or cylindrical regulating member on the outer peripheral side of the peripheral wall and controlling the inner diameter of the distal end side of the peripheral wall, a robot hand for capturing parts of a production line or a medical device, or a harvest for agricultural work. -There is an effect that it can be used as a gripping device such as a robot hand for capturing thinned-out objects.
[0060]
On the other hand, the cylindrical member can be positioned by inserting the fin into a cylindrical tube or a hole while pressing the fin against the inner peripheral surface of the tube or the hole. There is also an effect that the fin can be used as a base member of the packing member by inserting and positioning the fins in close contact.
[0061]
Furthermore, the present cylindrical member can be inserted into a cylindrical tube or hole or the like with the fin pressed against the inner peripheral surface of the tube or hole, and can be slid in the axial direction. The fins introduce and guide the attached matter on the inner peripheral surface into the peripheral wall and feed the same to efficiently remove the attached matter in the tube or hole, and can smoothly clean the inner peripheral surface of the tube or hole. This has the effect.
[0062]
At this time, even when a step or the like is present on the inner peripheral wall of the cylinder or the hole, the fins contact the step or the like due to the smooth expansion and contraction of the diameter on the distal end side of the peripheral wall, and the attached matter is smoothly removed. At the same time, it is possible to prevent the tubular member from being clogged in a tube or a hole.
[0063]
On the other hand, by providing a pipe communicating with the inside of the peripheral wall, the deposit can be smoothly discharged to the outside through the pipe.For example, the present tubular member can be used for a casing pipe in a ground anchor method. it can.
[0064]
In this case, the grout material in the casing pipe is sent out to form a space on the outer periphery of the tendon, so that there is an effect that an effective ground anchor method can be performed by the prestress applied to the tendon.
[Brief description of the drawings]
FIG. 1 is a side view of a discharge pipe.
FIG. 2 is a schematic diagram showing a state in which a grout material is scraped out using a discharge pipe.
FIG. 3 is a perspective view of a tubular member.
FIGS. 4A and 4B are front views of a tubular member, wherein FIG. 4A shows an enlarged state and FIG.
FIG. 5 is a perspective view of a main body of the tubular member.
6A is a plan view, FIG. 6B is a front view, and FIG. 6C is a bottom view of one type of fin alone.
FIGS. 7A and 7B show a state in which both fins are inserted, wherein FIG. 7A is a front view, and FIGS. 7B and 7C are side views showing one of the fins as a solid line and the other fin as an imaginary line.
8A is a plan view, FIG. 8B is a front view, FIG. 8C is a bottom view, and FIG. 8D is a side view of the other type of fin alone.
FIG. 9 is a cross-sectional view showing a state of scraping the grout material in the casing pipe.
FIG. 10 is an image diagram showing a state where the present tubular member is applied to a well.
FIG. 11 is a side view of a cylindrical member when applied to a robot hand using a ring.
FIG. 12 is a side view of a tubular member when applied to a robot hand using the tubular member.
FIGS. 13A to 13D are schematic diagrams sequentially showing a conventional ground anchor method.
[Explanation of symbols]
3 tubular member 6 fin 7 fin D casing pipe

Claims (9)

A large number of fins that are joined alternately or sequentially so that the side ends are slidably arranged are circularly arranged so as to form a continuous peripheral wall, and the distal end of the peripheral wall has a structure that can be elastically reduced or enlarged. A cylindrical member having a space formed inside the distal end side of which can change the distal end diameter. 2. The cylindrical member according to claim 1, wherein each of the fins is curved or bent in an outer peripheral direction, and has a conical cylindrical shape whose distal end is enlarged as a whole. 3. The tubular member according to claim 1, wherein a side end of each fin is slidably joined to another adjacent side end. 4. The tubular member according to claim 3, wherein the adjacent fins partially overlap with each other in the circumferential direction and are joined to each other to form a peripheral wall which is hermetically sealed from the outer peripheral portion. A change in the tip diameter according to claim 1, 2, 3, or 4, further comprising a ring-shaped regulating member that is extrapolated to the outer peripheral side of the peripheral wall and expands / contracts the diameter by enlarging / reducing the diameter. A cylindrical member that can be used. A cylindrical regulating member is provided on the outer peripheral side of the peripheral wall so as to be slidable along the axis of the peripheral wall, and is inserted into and removed from the peripheral wall to increase or decrease the diameter of the distal end side of the peripheral wall. A cylindrical member capable of changing the tip diameter of item 1 or 2 or 3 or 4. When the fin slides in a cylindrical tube or hole in the axial direction, a fin (6) whose leading end portion guides the attached matter on the inner peripheral surface of the cylindrical body into the inside of the peripheral wall; A fin (7) that is curved or bent in the axial direction, the tip portion is in contact with the inner peripheral surface of the cylinder or hole, and guides axial movement in the cylinder or hole during the feeding operation. A cylindrical member capable of changing the tip diameter of item 1 or 2 or 3 or 4. 8. A tip according to claim 7, wherein a hollow pipe communicating with the space inside the peripheral wall and discharging the adhering matter introduced inside the peripheral wall to the outside of the cylinder or the hole is attached to the base end side of the tubular member. A cylindrical member whose diameter can be changed. 9. The tubular member according to claim 7, wherein the tube is a casing pipe (D) in the ground anchor method.

Images