JP3035427U - Screw used in small diameter buried pipe propulsion method - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a screw in which wings do not damage the inner surface of an embedded pipe. SOLUTION: A shaft portion 41 that is connected to a drive means and rotates
And a cylindrical screw base portion 21 having a length obtained by dividing the shaft portion 41 into a plurality and capable of inserting the shaft portion 41, and a blade portion 22 provided on the outer periphery of the screw base portion 21 for a predetermined pitch. It consists of screw base 21 and wing 22
And are integrally molded with resin.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a screw inserted into an embedded pipe for use in a small-diameter embedded pipe propulsion method.

[0002]

[Prior art]

 Conventionally, there have been two methods of construction for promoting a small-diameter buried pipe: press fitting and excavation propulsion. The former forcedly press-fits the buried pipe without excavating, and although the work is simple, it was limited to the case where the buried pipe could withstand the press-fitting. In the latter, a screw conveyor was installed inside the buried pipe, and the earth and sand excavated at the tip of the buried pipe passed through the inside of the buried pipe to be discharged.

Therefore, the screw conveyor installed inside the buried pipe must always rotate relative to the buried pipe in order to send the earth and sand excavated at the tip of the buried pipe backward. The wing sometimes caused minor damage to the inner surface of the buried pipe. A technique for avoiding this has been disclosed in Japanese Utility Model Laid-Open No. 5721/1993. This is because the roller is attached to the blade of the screw, the blade of the screw does not directly contact the buried pipe, and the roller can roll in the rotation direction of the screw, thereby reducing the friction with the inner surface of the buried pipe. It was

[0004]

[Problems to be solved by the device]

 However, in the above technology, when the screw conveyor used in a small-diameter buried pipe is used, the screw conveyor is small in size according to the buried pipe. Was expensive. In addition, when the size of the roller was increased in order to facilitate manufacturing, the weight of the entire screw conveyor was large and the frictional resistance with the buried pipe was also large, which was a problem.

The present invention has been made in view of the above points, and an object of the present invention is to provide a screw that does not rely on rollers or the like, and whose wings do not damage the inner surface of the buried pipe.

[0006]

[Means for Solving the Problems]

 In view of this, the present invention relates to a screw which is arranged in a small-diameter buried pipe to be propelled and which is conveyed to the rear to discharge the earth and sand excavated at the tip in the propulsion direction, is connected to the drive means and rotates. And a cylindrical screw base part having a length obtained by dividing the shaft part into a plurality of parts and capable of inserting the shaft part, and a blade part for a predetermined pitch provided on the outer periphery of the screw base part. The gist is a screw used in the small-diameter buried pipe propulsion method, characterized in that the blade and the wing are integrally molded with resin.

Further, it is preferable that the screw base portion is a screw base portion that is prevented from sliding in the circumferential direction of the shaft portion when it is inserted by the shaft portion, and the wing portion is further screwed by the shaft portion. It is preferable that the wing portion is capable of connecting adjacent edge sides when inserting the base portion. Further, the present invention relates to a screw which is arranged in a small-diameter buried pipe to be propelled and which is conveyed to the rear for discharging earth and sand excavated at the tip of the propulsion direction, is connected to a driving stage and rotates. And a cylindrically shaped screw base portion that can be inserted through the shaft portion, a through hole provided at an appropriate position of the screw base portion, and a through hole of the through hole when the screw base portion is inserted through the shaft portion. Engagement recesses provided on the surface of the shaft portion that match the position, threaded members that engage with the engagement recesses while penetrating through the through holes, and wings with a predetermined pitch provided on the outer periphery of the screw base. Part, a connecting hole provided in the vicinity of an edge where the wing is adjacent, and a fastening member that is fastened while penetrating the connecting hole, and connects the screw base and the wing. When integrally molded with resin In, and the gist also screw that Oite use small diameter buried pipe jacking method, each wing portion is provided characterized by comprising in the can configure disk Liu shape by connecting a plurality of screw base.

The engagement recess may be an engagement groove formed in a groove shape that is continuous in the axial direction on the surface of the shaft portion. Further, in this case, the engagement recess is an engagement groove formed in a groove shape which is continuous on the surface of the shaft portion in the axial direction, and a stopper is provided at one end of the shaft portion and a fixing portion is provided at the other end thereof. It is preferable that the nut is detachably provided.

[0009]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. Since the present invention relates to a buried inner tube used by being inserted into the buried pipe in the small-diameter buried pipe propulsion method, first, an outline of the propulsion device for the small-diameter buried pipe and the propulsion method of the buried pipe is explained. To do. As shown in FIG. 1, the small-diameter buried pipe propulsion apparatus 1 is provided with a base 2 and parallel rails 3 and 4 on the base 2, and a space for moving forward and backward on the rails 3 and 4. Ride parts 5 and 6 and a propulsion part 7 supported by both slide parts 5 and 6 are provided. The propulsion unit 7 has a hydraulic motor 8 so that the propulsion unit 7 is transmitted to the drive shaft at the substantially center of the propulsion unit 7. Further, hydraulic cylinders 9 and 10 are built in the slide portions 5 and 6 so that they can advance and retreat on the rails 3 and 4 together with the propulsion portion 7. The rear end of the lead tube 11 is connected to the drive shaft of the propulsion unit 7, and this rotational force is transmitted, and the propulsion unit 7 moves forward to give a propulsion force. A tip conduit 12 provided with a direction correcting head is connected to the tip of the lead tube 11, and an excavating screw 13 can be connected to the rear portion of the lead tube 11. When the excavating screw 13 is connected to the lead tube 11, the rear end of the screw can be connected to the drive shaft of the propulsion unit 7 so that the driving force is transmitted and the propulsion unit 7 advances. The propulsion unit 7 has an annular embedded pipe contact portion 15 concentric with the drive shaft that is projected and supported in the propulsion direction side of the propulsion unit 7, and the embedded pipe 14 is supported by the contact portion 15. By abutting the rear ends, the position where the buried pipe should be placed is determined. That is, the buried pipe 14 whose rear end is in contact with the contact portion 15 can be arranged so as to surround the excavating screw 13 connected to the concentric drive shaft. Furthermore, the base member 2 of the propulsion device 1 is provided with an internal member 19 for supporting the vicinity of the front end of the buried pipe 14 and guiding the axis of the buried pipe 14 along the propelling direction. . Thereby, the buried pipe 14 can be propelled in a desired direction by the forward movement of the pushing portion 7. In addition, a transit 16 is installed behind the propulsion unit 7, the lead tube 11 and the drive shaft of the propulsion unit 7 are hollow, and the light emitted from the light-emitting body provided inside the front conduit 12 is It reaches the transit 16 through the above hollow interior, and the state of this light emitter can be confirmed. Then, it is possible to know the propulsion direction of the front conduit according to the state of the luminous body.

On the other hand, in the small-diameter buried pipe propulsion method using the propulsion device 1, first, as shown in FIG. 2 (a), the propulsion device 1 is installed in the starting shaft 17, and the propulsion device 1 is installed. Thus, the leading conduit 12 and the lead pipe 11 continuous with the leading conduit 12 are propelled to the reaching shaft. The propulsion at this time is performed by advancing and retreating the propulsion unit 7, and one lead tube 11 is propelled and then retracted, and the next lead tube 11 is added and propelled again. When the tip conduit 12 and the lead tube 11 are propelled, the light emitted from the luminous body in the tip conduit 12 is confirmed by the transit 16 at the rear of the propulsion unit 7 (on the right side in the figure), and whether or not it follows the planned direction. Continue to promote while making decisions. If the direction is different from the planned direction, the direction is corrected by performing a direction correction operation (changing the direction of the inclined surface) by the direction correction head (head having a inclined surface) of the leading conduit 12. Then, as shown in FIG. 2 (b), after the lead pipe 11 is propelled to the reaching shaft 18, the lead pipe 12 is removed and the screw 13 and the buried pipe so as to surround the screw 13 are attached to the propulsion device 1. 14 is installed, and the screw 13 is connected to the rearmost portion of the lead tube 11 to propel the screen 13 and the buried tube 14 at the same time. Subsequently, after propelling one screw 13 and the buried pipe 14, as shown in FIG. 2C, the propulsion unit 7 of the propulsion device 1 is retracted, and the next screw 13 and the buried pipe 14 are replenished. Promote again. In the case of the above-mentioned propulsion, since the reed tube 11 is guided as a guide, it is not necessary to correct the propulsion direction, and the leading conduit 12 is not necessary. Further, the lead pipe 11 that guides the propulsion direction is removed in the reaching vertical shaft 18 when it reaches the reaching vertical shaft 18, and the lead pipes 11 that reach the reaching vertical shaft 18 by the progress of the propulsion also sequentially arrive at the reaching vertical shaft 18. Remove at. In this way, after propelling the screw 13 and the buried pipe 14 between the starting shaft 17 and the reaching shaft 18, only the screw 13 is attracted by the propulsion unit 7 to make the inside of the buried pipe 14 hollow. The piping from the starting shaft 17 to the reaching shaft 18 is completed.

The method for propelling the buried pipe propulsion apparatus 1 and the buried pipe 14 has been described above. Next, an embodiment of the screw will be described. As shown in FIGS. 3 and 4, the present embodiment includes a screw base portion 21 and a wing portion 22 integrally formed of plastic resin, and a shaft portion 41 that is rotated by transmitting a driving force. The screw base portion 21 is formed into a cylindrical shape, and the inner diameter thereof is slightly larger than the outer diameter of the shaft portion 41, so that the shaft portion 41 can be sufficiently inserted. Further, through holes 23, (24,) 25, 26 are provided at both ends of the screw base portion 21, and a screw member (for locking the screw base portion 21 in a state where the shaft portion 41 is inserted ( (Not shown) can be penetrated. Further, the blade portion 22 provided around the screw base portion 21 is formed with a screw for one pitch over the entire length L of the screw base portion 21. A connecting piece 27 is provided at one end of the wing 22 and is used for connecting to another wing of the same type. Therefore, the connecting piece 27 is provided with connecting holes 28 and 29, and at the other end of the wing portion 22 having no connecting piece 27, the connecting piece 27 is provided with a connecting hole. 30 and 31 are pierced. Therefore, the blade 22 is made into a screw having a plurality of pitches by abutting the connecting piece 27 on the main body of another adjacent wing portion and tightening it with a fastening member such as a bolt and a nut while penetrating the overlapping holes together. It is possible (see Figure 6).

On the other hand, the shaft portion 41 is configured to be long so that it can be inserted into the plurality of screw base portions 21, and is made of metal for transmitting the driving force. And, the engaging recesses 43a ... 43b, 43c, 44a ..., 44b, 45a ... 45b, which are used when the screw base 21 is locked on the surface of the main body 42 of the shaft portion 41, 45c is provided. In addition, a stopper 46 is provided at one end of the shaft main body 42 so as to determine the position of the screw base 21 to be inserted, and its outer diameter is substantially the same as the outer diameter of the screw base 21. is there. A male screw 47 is engraved on the other end so that a fixing nut 61 (FIG. 6) can be screwed into it, and a plurality of screw bases 21 are provided between the fixing nut 61 and the stopper 46. It is supposed to be installed. Further, an engaging portion 48 is provided at the tip of the male screw 47, and an engaged recess 49 for engaging with the engaging portion 48 is provided at the other end. Can be connected. In FIG. 4, the engaging portion 48 is formed by a male screw and the engaged recess is formed by a female screw.

With such a configuration, when the shaft portion 41 is fixed to a predetermined number of screw bases 21 in a fixed state, the screw members 51, 52, 53, 54 are screwed as shown in FIG. When any one of the through holes 23 to 26 (FIG. 3) of the base portion 21 is penetrated, the engaging recesses 43 (, 44) and 45 provided on the surface of the shaft body 42 are engaged with each other. Only the respective tips of the screw members 51, 52, 53, 54 can be engaged with the recesses 43 (, 44), 45. The engagement by the screw members 51, 52, 53, 54 exclusively locks the screw base portion 21 into which the shaft portion 41 is inserted so as not to slide in the circumferential direction of the shaft portion 41. Further, as described above, the fixing nut 61 (FIG. 6) is screwed into the male screw 47 (FIG. 4) engraved at the tip of the shaft main body 42, so that the fixing nut 61 and the stopper 46 have a plurality of positions. The screw base 21 can be fixed so as to sandwich it, and such fixing is exclusively to prevent the screw base 21 into which the shaft 41 is inserted from sliding in the axial direction of the shaft 41. In this way, the screw base portion 21 can be locked to the shaft portion 41.

As described above, by inserting the shaft portion 41 into the plurality of screw base portions 21 and connecting the adjacent blade portions 22 to each other, as shown in FIG. The screw can be formed. At this time, the connecting pieces 27 (see FIG. 3) provided on the wing portions 22a to 22d are connected to the main bodies of the adjacent wing portions 22b to 22e, and the connection is made by the fastening members 62 and 63. It is done by wearing it. Then, as described above, each of the screw base portions 21a to 21e inserted into the shaft portion 41 (FIG. 4) is set in the axial direction of the shaft portion 41 by the stopper 46 and the fixing nut 61. In addition to being fixed, the screw members 51, 52, 53 fix the shaft portion 41 in the circumferential direction. Therefore, the shaft portion 41 and the plurality of blade portions 22a to 22e forming a long screw are integrated, and the rotation of the shaft portion 41 causes the blade portions 22a to 22e to rotate in a spiral shape, and the soil and sand. The function as a conveyer that can convey the can be exhibited.

It is needless to say that various embodiments can be taken without departing from the spirit of the present invention. For example, in each of the drawings showing the embodiments, the shaft portion 41 is formed in a hollow cylindrical shape, but this is used in order to effectively use this hollow portion during construction for excavation propulsion (for example, water Supply, etc.) and to reduce the weight of the entire screw including the shaft portion 41. Therefore, if the hollow portion is not used and there is no need for weight reduction, a rod-shaped structure is used. May be In addition, the end shape of the screw base 21 is formed into a key shape. This is because when different torques are applied to the wing portions 22, the torque is dispersed to the peripheral screw base 21 and This is for alleviating the stress concentration on the screw members 51, 52, 53 and is effective when there is play between the engaging recesses 43, 44, 45 and the heads of the screw members 51, 52, 53. Depending on the material of the screw base 21 and the means for locking the shaft 41, it is not necessary to form it into a key shape. Further, the screw base portion 21 has a different end shape from the screw base portion 21e near the stopper 46 and the screw base portion 21a near the fixing nut 61 in FIG. 6, which contact the stopper 46 and the fixing nut 61. It is to be configured so that it is possible, and it is clear from the overall purpose that this difference in shape does not influence the present invention.

[0016]

[Effect of the invention]

 INDUSTRIAL APPLICABILITY As described above, according to the present invention, the screw, which is arranged in the propelled small-diameter buried pipe and conveys backward to discharge the earth and sand excavated at the forward end in the propulsion direction, is connected to the driving means and rotates. It consists of a shaft part, a cylindrical screw base with a length that divides the shaft part into multiple parts, and through which the shaft part can be inserted, and a wing part of a predetermined pitch provided on the outer periphery of the screw base part. Since the screw used in the small-diameter buried pipe propulsion method is characterized in that the screw base and the blade are integrally molded of resin, a plurality of screw bases are inserted by the shaft. The entire screw can be configured by doing this, and each screw base is provided with a wing that forms only a specified pitch.Therefore, each screw base and wing is made of resin. As a result, it is possible to reduce the overall weight, reduce the friction between the inner surface of the embedded pipe and the wing when mounted inside the buried pipe, and, when the wing contacts the inner surface of the buried pipe, It can prevent scratching. And, for that purpose, rollers or the like are not necessary. Further, since a load acts on each of the screw base portion and the wing portion and can be dispersed even when a large load is exerted as a whole, it can be made of a material such as a resin having no strength. Moreover, since the screw is composed of a plurality of blades, even if a part of the screw is damaged, it can be repaired by replacing only the blade and the screw base of the damaged part. Further, since the screw base portion and the wing portion can be integrally molded, it is possible to mold the fine shape without causing a problem, and it is also possible to mass-produce.

If the screw base is a screw base that prevents the shaft from sliding in the circumferential direction when it is inserted by the shaft, the rotational force applied to the shaft is transmitted to the wing. As a result, it is possible to obtain the effect of the screw conveyor by the blade portion. Furthermore, if the wing portion is a wing portion that can connect adjacent end sides when inserting the screw base portion by the shaft portion, separate wing portions provided on the screen base portion that is divided into a plurality of pieces are continuous. Therefore, a continuous screw can be formed around the shaft.

Further, the present invention is a screw which is arranged in a small-diameter buried pipe to be propelled and is conveyed to the rear for discharging earth and sand excavated at the tip of the propulsion direction, which is connected to a driving step to rotate. A shaft portion, a screw base portion of an appropriate length formed into a cylindrical shape capable of inserting the shaft portion, a through hole provided at an appropriate portion of the screw base portion, and when the screw base portion is inserted into the shaft portion, Engaging recesses provided on the surface of the shaft portion that match the positions of the through holes, screw members that engage with the engaging recesses while penetrating the through holes, and a predetermined pitch provided on the outer periphery of the screw base. The wing portion of the minute portion, the connecting hole provided in the vicinity of the end side adjacent to the wing portion, and the fastening member that is fastened while penetrating the connecting hole. Part and resin integrally The screw used in the small-diameter buried pipe propulsion method is characterized in that the screw is formed by molding and the blades provided on multiple screw bases are connected to form a screw shape. Therefore, by inserting multiple screw bases that have blades that form only a predetermined pitch with the shafts and locking them with screw members, the multiple screw bases are integrated with the shafts. An integral screw can be constructed by connecting the wing portions around it with a fastening member. Moreover, due to the engagement recess of the shaft portion and the screw member, the rotational force of the shaft portion is faithfully transmitted to each screw base portion, and is also transmitted to the integrally formed blade portion, thereby forming a screw conveyor. Can be operated.

If the engaging recess is an engaging groove formed in the shape of a groove that is continuous in the axial direction on the surface of the shaft portion, intermittent recesses are formed on the surface of the shaft portion while paying attention to the position. It is also possible to form a concave shape into which the screw member is to be engaged, by cutting a continuous groove portion without providing it. Further, in this case, the engagement recess is an engagement groove formed in a groove shape which is continuous on the surface of the shaft portion in the axial direction, and a stopper is provided at one end of the shaft portion and a fixing nut is provided at the other end thereof. If it is detachably provided, the engaging groove can prevent the screw base from sliding in the circumferential direction, and can also prevent the sliding in the axial direction by the stopper and the fixing nut. It is also possible to distribute the load to multiple.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an outline of a small diameter buried pipe propulsion device.

FIG. 2 is an explanatory view showing a propulsion method for a small diameter buried pipe.

FIG. 3 is a front view of a screw base portion and a wing portion of the embodiment.

FIG. 4 is a front view of a shaft portion of the embodiment.

FIG. 5 is a partial cross-sectional view showing a state where the shaft portion is inserted into the screw base portion.

FIG. 6 is a front view of a state in which a screw is configured.

[Explanation of symbols]

 1 Small Diameter Buried Pipe Propulsion Device 13 Screw 14 Buried Pipe 17 Starting Vertical Shaft 18 Reaching Vertical Shaft 21 Screw Base 22 Feather 23, 24, 25, 26 Through Hole 28, 29, 30, 31 Connection Hole 41 Shaft 42 Main Body 43,44,45 Engagement concave portion 46 Stopper 47 Male screw 48 Engaging portion 49 Engaged concave portion 51,52,53,54 Screw member 61 Fixing nut 62,63 Tightening member L Total length of screw base

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[Procedure amendment]

[Submission date] November 1, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 3

[Correction method] Change

[Correction contents]

Claims (6)

[Utility model registration claims] 1. Arranged in a propelled small diameter buried pipe,
In a screw that conveys backward to remove earth and sand excavated at the tip in the propulsion direction, a shaft portion that is connected to drive means and rotates, and a length obtained by dividing the shaft portion into a plurality, and the shaft portion. Characterized in that it comprises a cylindrical screw base portion through which the screw base can be inserted, and a wing portion for a predetermined pitch provided on the outer circumference of the screw base portion, and the screw base portion and the wing portion are integrally molded with resin. A screw used in the small diameter buried pipe propulsion method. 2. The screw used in the small-diameter buried pipe propulsion method according to claim 1, wherein the screw base portion is a screw base portion that is prevented from sliding in the circumferential direction of the shaft portion when it is inserted by the shaft portion. . 3. A screw used in a small-diameter buried pipe propulsion method, wherein the wing portion is a wing portion capable of connecting adjacent end sides when inserting the screw base portion by the shaft portion. 4. Arranged in a propelled small diameter buried pipe,
In a screw that conveys backward to remove earth and sand excavated at the tip in the propulsion direction, a shaft portion that is connected to drive means and rotates, and a screw of a suitable length formed into a cylindrical shape that can pass through this shaft portion. A base portion, a through hole provided at an appropriate position of the screw base portion, an engagement recess provided on the surface of the shaft portion corresponding to the position of the through hole when the screw base portion is inserted into the shaft portion, and the through hole A screw member that penetrates the inside and is engaged in the engagement recess, a wing portion for a predetermined pitch provided on the outer periphery of the screw base, and a connecting hole provided near the end side where the wing portion is adjacent. , Consisting of a fastening member that is fastened while penetrating the connecting hole, integrally molding the screw base portion and the blade portion with a resin, and each blade portion provided in a plurality of screw base portions. Connect and Screw used in the small-diameter underground pipes jacking method characterized by comprising in the can configure-menu form. 5. The screw used in the small-diameter buried pipe propulsion method according to claim 4, wherein the engagement recess is an engagement groove formed in a groove shape in which a surface of the shaft portion is continuous in the axial direction. 6. The engagement recess is an engagement groove formed in a groove shape which is continuous in the axial direction on the surface of the shaft portion, wherein a stopper is provided at one end of the shaft portion and a fixing nut is provided at the other end. The screw used in the small diameter buried pipe propulsion method according to claim 4, wherein the screw is detachably provided.