KR101658756B1

KR101658756B1 - Propulsion Pipe

Info

Publication number: KR101658756B1
Application number: KR1020160074924A
Authority: KR
Inventors: 이문승
Original assignee: 이문승
Priority date: 2016-06-16
Filing date: 2016-06-16
Publication date: 2016-09-21

Abstract

The present invention relates to a propulsion tube in which an expansive film (Q) of a water-swellable adhesive is stably formed and maintained in a pipe connecting operation by improving the structure of a propulsion pipe joint part, comprising: a pipe body arranged in a row and screwed together; A male screw portion formed at a front end portion in the longitudinal direction of the tube main body and having a front outer circumferential surface, a male screw formed subsequently to the front outer circumferential surface, and a rear outer circumferential surface formed subsequently to the male screw; And a female threaded portion formed at a longitudinal rear end of the tube body, the female threaded portion including an inner inner peripheral surface, a female thread formed subsequently to the inner inner peripheral surface, and an outer inner peripheral surface formed subsequently to the female thread, A first circular groove is formed by a difference in diameter between an outer circumferential surface and an inner circumferential inner surface and a second circular groove is formed by a difference in length between a rear outer circumferential surface and an outer circumferential inner surface at a rear end thereof, A part of the expansion adhesive is pushed forward and backward and remains in the first circular groove and the second circular groove to form an exponential film.

Description

Propulsion Pipe

The present invention relates to a propulsion tube, and more particularly, to a propulsion tube in which an expansive film of a water-swellable adhesive is stably formed and maintained in a pipe connecting operation by improving the structure of a propulsion pipe joint.

In order to bury the water / sewage and various facilities pipelines in the ground, the trench construction must precede, and such trench construction causes many problems such as causing dust and noise, especially obstructing traffic.

In recent years, as an alternative to the earthquake disaster prevention work, there has been a tendency to build a pipeline using a propulsion method (speed construction method) to solve these problems. In this method, a work hole with a depth of several meters is made in every section of a section where a pipeline is to be buried, then a boring machine is inserted into the tunnel to excavate the tunnel, and a hydraulic tube is repeatedly installed in a tunnel formed at the rear of the boring machine It is a method to construct a pipeline by injecting.

In the longitudinal direction of the propulsion pipe used in such a method, joints are usually provided so as to be interconnected to each other. Particularly, in the case of a propulsion pipe for water supply and drainage pipes, a waterproof property is required, .

In the following prior art documents, a packing material made of a rubber material is used as the packing material, and a metal ring for wrapping the packing material from the outside is additionally constituted. Since the packing material made of a rubber material deteriorates due to long-term use, There is a problem that the time required for the connection of the propulsion pipe is increased and the installation cost is increased because of the process of press fitting the ash into the concrete pipe and the addition of the metal ring.

KR 20-0393677 Y1 2005.08.25.

A problem to be solved by the present invention is to provide an expansive membrane in a joint portion of a propulsion tube by applying a water expanding adhesive having a property of shortening a construction time and reducing installation cost and expanding upon contact with water, So that the formation of the propellant is stably maintained.

In order to solve the above problems, the present invention provides a propulsion tube comprising: a tube body arranged in a row and screwed together; A male screw portion formed at a front end portion in the longitudinal direction of the tube main body and having a front outer circumferential surface, a male screw formed subsequently to the front outer circumferential surface, and a rear outer circumferential surface formed subsequently to the male screw; And a female threaded portion formed at a longitudinal rear end of the tube body, the female threaded portion including an inner inner peripheral surface, a female thread formed subsequently to the inner inner peripheral surface, and an outer inner peripheral surface formed subsequently to the female thread, A first circular groove is formed by a difference in diameter between an outer circumferential surface and an inner circumferential surface, and a second circular groove is formed by a difference in length between a rear outer circumferential surface and an outer circumferential inner surface at a rear end thereof, And an exponential film is formed in the first circular groove and the second circular groove.

Further, in the propulsion tube of the present invention, a spiral groove is further formed in the male screw or the female screw.

Further, in the propulsion tube of the present invention, the helical groove is formed between the male thread of the male screw and the female screw of the female screw, or between the female screw of the male screw and the female screw of the female screw.

In addition, the propelling tube of the present invention is characterized in that a cover is further provided on the upper part of the circular groove.

According to the propulsion tube of the present invention, the first circular groove formed in the front outer circumferential surface, the structure in which the length of the outer circumferential surface is longer than the length of the front outer circumferential surface, and the spiral groove formed between the male screw and the female screw, The expansive reliability of the present invention is improved because the film is formed stably and the exponential film is stably maintained in the press-in process.

Further, the construction time is shortened due to the simple fastening structure and the installation cost is reduced.

1 is a front sectional view showing a propulsion tube according to the present invention.
FIG. 2 is a sectional view showing a fastening state of a propulsion tube according to the present invention. FIG.
3 is a cross-sectional view illustrating exponential film formation of a first circular groove in a propelling tube according to the present invention.
4 is a sectional view showing a spiral groove formed between the upper end of the male thread and the female thread in the propelling tube according to the present invention.
Fig. 5 is a cross-sectional view showing a helical groove formed on the base of male thread and female thread for comparison with the embodiment of Fig. 4; Fig.
Fig. 6 is a view for explaining the spacing (a) in the screwing process and the spacing (b) in the press-fitting process in the state where the helical grooves are formed on the side surfaces of the male thread and the female thread, Cross-section.
7 is a sectional view showing a cover formed at a distal end portion of a female screw portion in a propulsion tube according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a cross-sectional view showing a fastening state of a propulsion tube according to the present invention, and Fig. 3 is a cross-sectional view showing a state where the index of the first circular groove in the propulsion tube according to the present invention Sectional view showing film formation.

1, 2 and 3, the propulsion tube of the present invention comprises a tube main body 10, a male threaded portion 20 and a female threaded portion 30 formed at both ends in the longitudinal direction of the tube main body 10 In the case of a propelling tube, a leading tube disposed in the chamber immediately after the tentering machine, a final tube disposed at the final end of the excavated tunnel, and a plurality of standard tubes disposed between the leading tube and the final tube, The male screw portion 20 and the female screw portion 30 are omitted in the pipe and the final pipe.

That is, the mutual connection of the respective propulsion pipes is accomplished through screwing of the female thread portion 30 of the propulsion tube disposed at the front side and the male thread portion 20 of the propulsion tube disposed at the rear side. The operation of applying a water-expanding adhesive agent which is capable of expanding when the water-contacted portion 20 is brought into contact with water is performed. In the fastening process, the threaded portion D or other portion of the screw- (Hereinafter, referred to as an 'exponential membrane'), and the exponential membrane Q is stably maintained in the process of pressurizing the propulsion pipe by the hydraulic jack.

The pipe body 10 is formed into a cylindrical shape having the same outer circumferential portion in the longitudinal direction so as not to have a protrusion in the joint portion when connected to each other, And is made of a synthetic resin or a metal material having mechanical strength and rigidity so as not to generate cracks during press-fitting.

The male thread portion 20 is formed at a front end portion in the longitudinal direction as a part of the tube main body 10 and has a front outer peripheral surface 21, a male thread 27 formed subsequently to the front outer peripheral surface 21, And a rear outer circumferential surface 25 formed subsequently to the outer circumferential surface 25.

The female screw portion 30 is formed at the rear end portion in the longitudinal direction as a part of the tube main body 10 and has an inner side portion 21, a male screw portion 27, and a rear side outer peripheral surface 25 corresponding to the front outer peripheral surface 21, The inner circumferential surface 31 is formed with a female screw 35 and an outer circumferential inner surface 33. The length of the outer circumferential surface 33 is shorter than the length of the rear outer circumferential surface 25. [

In the present invention, the male screw portion 20 and the female screw portion 30 are not composed of only the male screw 27 and the female screw 35 as described above.

A first circular groove e is formed by a difference in diameter between the front outer peripheral surface 21 and the inner inner peripheral surface 31 and a rear outer peripheral surface 25 and an outer inner peripheral surface 33 are formed at the rear end, A part of the water expanding adhesive applied to the male screw 27 in the screwing process of the propelling tube is formed in the screwed portion of the male screw 27 and the female screw 35, (Q), and the remainder is pushed in the forward and backward direction and remains in the first circular groove (e) and the second circular groove (b) to form the exponential film (Q).

Then, the first circular groove (e) performs an overflow preventing function to prevent the water expansion adhesive from flowing into the propelling tube, and then the exponential film (Q) formed in the first circular groove (e) Water-tight function.

That is, in the case where the first circular groove (e) is not formed, when the water expanding adhesive is excessively applied during the application of the water expanding adhesive, the water expanding adhesive contacts the inner side contact of the male screw portion 20 and the female screw portion 30 The first circular groove (e) is formed by a water-swellable adhesive agent which is pushed forward at the threaded portion of the male screw (27) and the female screw (35) So that overflow of the water expansion adhesive is prevented.

As described above, the first circular groove (e) allows a worker to have a sufficient amount of coating in the process of applying the water-swellable adhesive, and relieves the psychological burden on the excessive amount of coating, thereby enhancing work convenience.

In addition, when water flowing into the propelling tube flows into the first circular groove (e), the exponential film (Q) formed in the first circular groove (e) expands due to contact with water, do.

FIG. 4 is a cross-sectional view illustrating a spiral groove formed between the upper end of the male thread and the female thread in the propulsion tube according to the present invention. FIG. 5 is a view for comparison with the embodiment of FIG. FIG. 6 is a cross-sectional view illustrating a spiral groove. FIG. 6 is a view for comparing the embodiment of FIG. 4 with the embodiment of FIG. 4 in a state in which a helical groove is formed on the side of a male thread and a female thread, Is a cross-sectional view illustrating the spaced apart state (b).

Referring to FIGS. 2 to 6, in the propulsion tube of the present invention, as described above, together with the exponential membrane (Q) formed in the first circular groove (e) and the second circular groove (b) The exponential film Q formed on the inner circumferential surface D increases the exponent of the propelling tube.

However, since the water expanding adhesive application work and the screw tightening work are manually performed in the narrow work hole in which the hydraulic jack is installed, it is difficult to apply the water expansion adhesive to the male screw 27 constantly, The formation of the exponential film Q of the screw tolerance portion D may become poor due to the variation of the tolerance portion D. [

The present invention may further include a helical groove a formed between the male screw 27 and the female screw 35 so that the exponential film Q of the screw tolerance portion D can be stably formed and maintained.

Specifically, the helical groove (a) is a gap formed along one or both sides of the male screw (27) and the female screw (35), and the male screw (27b) A part of the thread is left by the female thread 35a to fill the space of the spiral groove a so that when the fastening is completed, a spiral exponential film Q is formed in the spiral groove a do.

The helical groove a may be selectively formed in the male screw 27 or the female screw 35. However, the male thread 27a or the base screw m of the female screw 35a may be formed by the driving force of the hydraulic jack, As shown in FIG. 5, when the helical groove a 'is formed in the base portion m, the strength and stiffness of the thread can be reduced by reducing the cross-sectional area.

In order to avoid the above case, when the helical grooves a '' are formed in the side surfaces n and n 'of the male thread 27a and the female thread 35a, as shown in Fig. 6, The male thread 27a and one side n of the female thread 35a are closely contacted to each other to be fastened (Fig. 6a), and then the other side n 'is closely contacted during the press fitting process ) Variation in the spacing of the threaded portion (D), and formation of the expired film (Q) can be inhibited.

Therefore, in the present invention, the height h of the male thread 27a is made shorter than the height h 'of the female thread 35a to avoid the above two cases, And a helical groove (a) is formed between the female screw boss (35b).

As described above, the water-swellable adhesive pushed to the end of the helical groove (a) in the screw tightening step is collected in the second circular groove (b) to form the circular exponential film (Q). However, since the soil of the tunnel may enter the second circular groove (b) and the formation of the exponential film (Q) may be inhibited during the indentation process, the cover (c ) May be further provided. As shown in Fig. 7, the cover c is provided in such a manner that it is detachably attached to the distal end portion of the female thread portion 30 by screwing.

As described above, in the propulsion tube of the present invention, the water introduced through the gaps of the screw fastening portions is inserted into the first circular groove (e), the exponential film (Q), the screw tolerance portion (D) The index membrane Q formed in the second circular groove b and the exponential film Q formed in the second circular groove b are blocked to maximize the exponential property of the joint portion of the propeller tube and the high- The reliability of the index of the propulsion tube according to the present invention is improved.

Meanwhile, in the present invention, the construction time is shortened by a simple coupling structure. However, in order to further shorten the construction time, both the male screw and the female screw may be constituted of two rows or three rows of square screws.

This is because the square screw is easier to tighten than the triangular screw, and the number of threads is two or three because of the limited length of the male and female threads when the lead is increased by increasing the pitch of the screw The number of male threads and female threads is reduced, so that the problem of deterioration of the fastening force due to the adoption of square screws may become greater, so that the number of threads is increased to enlarge the lead of the screws.

However, even if the male screw and the female screw are both composed of two rows or three rows of square screws, the tightening force is lower than that of the triangular screw, and the water expanding adhesive of the present invention complements the screw to secure the fastening force of the screw.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: pipe body
20: Male threads
21: front outer circumferential surface
25: rear outer circumferential surface
27: Male thread
30: Female threads
31: Inner inner circumferential surface
33: outer inner peripheral surface
35: Female threads

Claims

A tube main body 10 arranged in a row and fastened to each other;
A front outer circumferential surface 21 formed on the front end portion in the longitudinal direction as a part of the tube main body 10 and having a male thread 27 formed subsequently to the front outer circumferential surface 21 and a rear outer circumferential surface (20) including a threaded portion (25); And
And an inner inner circumferential surface 31 formed next to the inner inner circumferential surface 31 and an outer inner circumferential surface 31 formed next to the female screw 35. The inner inner circumferential surface 31, (30) including a female screw portion (33)
A first circular groove e is formed by a difference in diameter between the front outer circumferential surface 21 and the inner inner circumferential surface 31 at the front end when the screw is fastened and the first circular groove e is formed at the rear end by a difference in length between the rear outer circumferential surface 25 and the outer inner circumferential surface 33 A second circular groove b is formed and the threaded portion of the male screw 27 and the female screw 35 by the water expansion adhesive applied to the male screw 27, An exponential film Q is formed in the circular groove b,
The tube body 10 to be interconnected has the same outer periphery in the longitudinal direction,
Wherein the male screw (27) and the female screw (35) are provided with two rows or three rows of square screws, and the male screw (27) or the female screw (35) is further formed with a helical groove (a).

delete

The method according to claim 1,
The helical groove a is formed between the male thread 27a of the male thread 27 and the female thread 35b of the female thread 35 or between the male thread 27b and the female thread 35b, Is formed between the female threads (35a).

The method according to claim 1,
And a cover (c) is further provided on an upper portion of the second circular groove (b).