JP4741093B2 - Pipe line structure with deformed pipe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention comprises a pipe joint in which an insertion port of another pipe is inserted into a receiving port of one pipe in order in the pipe direction, and has a pipe joint in which at least one of the two pipes is a deformed pipe. It relates to the buried pipeline structure.
[0002]
[Prior art]
Liquid transport facilities such as water and sewage systems (hereinafter referred to as pipes) are constructed with pipe joints that are inserted into the inlets of one pipe in order in the pipe direction. It has a flexible structure that adapts to earthquakes and land subsidence to some extent by expansion and contraction and bending (removal and bending of the insertion slot with respect to the receiving port). As the pipe joint type in the flexible structure pipe, there are those having an expansion / contraction function such as A-type, K-type, and T-type shown in FIGS. As shown in FIGS. 18 and 19, the A-shaped joint and the K-shaped joint are inserted into the receiving port 1a of one tube 1 and the insertion port 2a of the other tube 1 is inserted into the receiving port 1a and the insertion port 2a. After the rubber ring 6 is interposed therebetween, the push ring 4 is fastened to the receiving flange 1b by T-bolts and nuts 5, and the rubber ring 6 is press-fitted by the tightening. As shown in FIG. 20, the T-shaped joint has a configuration in which after inserting the rubber ring 6 in the receiving port 1a, the insertion port 2a is inserted into the receiving port 1a.
[0003]
In any of these joint structures, as long as the insertion port 2a does not come out from the receiving port 1a, the other tube 1 moves in the tube axis direction with respect to one tube 1, thereby absorbing the expansion and contraction between the tubes 1 and 1. Therefore, it exhibits ground followability against ground subsidence due to secular change and ground deformation of joints during earthquakes, etc., and does not impair the water stop performance.
[0004]
However, when the amount of expansion and contraction assumed at the time of pipeline design is exceeded, for example in the case of a large earthquake, the insertion port 2a may come out from the receiving port 1a. For this reason, at the time of expansion and contraction, in order to maintain the water stop function, it is required that the separation preventing function works. As the joint structure having the separation preventing function, there are an NS-type joint, an SII-type joint, and the like shown in FIGS. In both the joints, the lock ring 3 is provided on the inner surface of the receiving port 1a, the projection 2b is provided on the insertion port 2a, and the projection 3b is engaged with the lock ring 3, so that the insertion port 2a is removed from the receiving port 1a. To prevent. In the figure, 3a is a centering rubber of the lock ring 3, and 3c is a backup ring.
[0005]
The pipes composed of pipe joints that have this allowance for expansion and contraction and the function to prevent separation (prevention of detachment function) have a chain structure. Thus, after the joint follows expansion and contraction and bends, and further extends to the limit, the pipe line is maintained by the separation preventing structure.
[0006]
In recent years, since seismic resistance is desired, a chain structure using an expansion joint with a detachment prevention function such as the NS, S, and SII types described above has been adopted for the pipe. A type with no withdrawal prevention function such as A type is used. For this reason, in order to make such a pipe line composed of a joint with a separation preventing function, it is possible to replace the pipe with a pipe line such as an NS type joint, but the cost becomes high.
[0007]
For this reason, conventionally, a technique for imparting a function to a pipeline having no separation preventing function has been developed, and one of them is disclosed in Japanese Patent Laid-Open No. 10-122456. In this technique, as shown in FIG. 23, ring-shaped plates 11 and 12 are fitted to the receiving port 1a and the insertion port 2a, respectively, and a lock member 13 is provided on the plate 12 of the insertion port 2a. By press-contacting the insertion port 2a with the bolt 14, the lock member 13 is inserted into the outer peripheral surface of the insertion port 2a to fix the plate body 12. The screw rod 15 is passed between the plate bodies 11 and 12, and the expansion and contraction between the receiving port 1a and the insertion port 2a is achieved by the contact and separation of the plate bodies 11 and 12 which are allowed by the nuts 16 at both ends of the screw rod 15. Stop withdrawal.
[0008]
In the flexible structure pipe using the joint B having the detachment prevention and expansion / contraction function, various bent pipes such as a curved pipe, a T-shaped pipe, and a fallen pipe are provided in the bent portion and the branched portion shown in FIG. Although 1 'is adopted, the non-average force P works on these pipe line portions due to the internal water pressure. At this time, if the pipe joint B is expandable / contractable, the function may cause the pipes 1, 1 ′ to move, creating a void in the ground and causing adverse effects such as depression on the upper road surface. . For this reason, normally, the joint composed of the deformed pipe 1 ′ is assumed to be an integrated one having no expansion and contraction and bending functions, so that the deformed pipe 1 ′ does not move relative to the other connecting straight pipes 1 due to the non-average force P. I have to.
[0009]
For example, in the pipe joint B shown in FIG. 23, as indicated by a chain line in FIG. 23, the nut 16 is brought into contact with the ring-shaped plate body 12 to reduce the movement width of the insertion port 2a to form an integrated pipe joint. . In the NS type joint, as shown in FIG. 24, in the pipe joint B ′ in which the insertion port 2a of the deformed tube 1 ′ is inserted into the straight tube receiving port 1a, the centering is provided on the inner surface of the receiving port 1a. A liner 9 is provided via a rubber 9a. The liner 9 prevents the insertion port 2a from being inserted, and the movement width of the projection 3b with respect to the lock ring 3 is reduced to form an integrated pipe joint. In the figure, 1c is a bending prevention protrusion. Further, as shown in FIG. 25, in the pipe joint B ″ in which the insertion port 2a of the straight tube 1 is inserted into the receiving port 1a of the deformed tube 1 ′, the movement width of the projection 3b with respect to the lock ring 3 is reduced. Then, an anti-bending ring 8a is connected to the outer surface of the insertion port 2a by a set bolt 8b to form an integrated pipe joint, and a joint B 'painted black in FIG. Yes (hereinafter the same).
[0010]
In addition, as shown in FIG. 30, as a common protective method common to A, T, K type general pipes and SII, NS type seismic pipes, concrete is enclosed so as to surround the deformed pipe 1 ′ where the non-average force P works. There is also a structure that resists the non-average force P by immobilizing the deformed pipe 1 'by the concrete block C.
[0011]
Furthermore, as shown in FIG. 31, there is a configuration in which concrete is cast so as to surround the middle of the deformed pipe 1 ′ and not in the whole, and the deformed pipe 1 ′ is fixed by the concrete block C. At this time, the gap between the insertion port 2a of the deformed tube 1 'and the receiving port 1a of the straight tube 1 is suppressed as the integrated joint B' shown in FIG.
[0012]
In the pipe line in which the parts of the deformed pipe 1 ′ are integrated using these integrated joints B ′ and B ″, even if the deformed pipe 1 ′ part is integrated, the subsequent straight pipe 1 can move. There is a risk that the joints B ′ and B ″ on which the non-average force P works include the straight pipe 1. For this reason, as shown in FIG. 29, also in the joint part of the straight pipe 1 and the straight pipe 1, the unstretchable integration is aimed at. In the joint B ′ between the straight pipes 1, as shown in FIGS. 26 and 27, the liner 9 is provided and integrated through the centering rubber 9 a in the same manner as described above. In the case of a pipeline, a KF joint structure shown in FIG. 28 may be employed. In this way, the integrated structure (length L in FIGS. 29 to 33) becomes longer, so that the braking force due to the ground reaction force Q and the tube friction force R is increased, and the non-average force P is resisted. Thus, the pipe movement in the pipe joint is effectively prevented.
[0013]
[Problems to be solved by the invention]
In the joint structure shown in FIG. 23, since one plate 12 is fixed to the insertion port 2a by biting, if a large pulling force is applied due to a large earthquake or the like, the biting force resists the pulling force. There is a risk that the insertion port 2a may come out of the receiving port 1a.
[0014]
In the structure shown in FIGS. 30 and 31, the installation of the concrete block C is complicated and causes an increase in cost. In the figure, F indicates a soft structure portion. In addition, it is difficult to secure a space for embedding the concrete block C in a congested place such as a recent urban pipe where the pipe line is complicated and bent pipes continue. In addition, in the straight pipeline shown in FIG. 32 (a), when another buried object D is newly installed on the pipeline, as shown by the oblique lines in FIG. 32 (b), as shown in FIG. Although it is necessary to make a detour (turn around), as shown in FIG. 33, when concrete block C is placed, the concrete curing time is required, so the construction period becomes longer and water flow is resumed. take time. Normally, water supply, sewage, industrial water supply, etc. are important lifelines that are indispensable for daily life and industrial activities. Therefore, it is preferable that the water cut-off time associated with renewal of existing pipelines and cut-off piping is as short as possible. Similarly, the construction period will be longer in the construction of new pipelines.
[0015]
Thus, conventionally, the joint portions B ′ and B ″ of the deformed pipe 1 ′ are immovable. However, the joint portion is also immobile with respect to the non-average force P, and is not subject to large ground fluctuations such as during an earthquake. As long as the insertion port 2a does not come out from the port 1a, it is preferable that the other tube 1 moves in the axial direction to follow the deformed tube 1 'to prevent breakage of the pipe line and ensure water stopping performance.
[0016]
The first object of the present invention is that the deformed pipe portion exerts a separation preventing force (generally 3DKN) at the time of an earthquake without placing concrete, and can resist non-average forces. The second problem is to follow large ground fluctuations such as the above, and to finally exhibit the ability to prevent separation.
[0017]
[Means for Solving the Problems]
In order to achieve the above first object, the present invention presupposes a pipe joint comprising a flanged receiving port, spanning a flange between adjacent flanges of the pipe, and by this flange, It was decided to regulate contact and separation.
[0018]
Since it is a flange provided at the receiving port, the flange has sufficient resistance unless it is damaged, and the flange is restricted as long as it does not cause damage to the flange and damage to the locking parts on both ends. Is done. For this reason, the joint portions at both ends of the deformed pipe are integrated, and the deformed pipe does not move due to the non-average force, and it is not necessary to integrate the pipe including the deformed pipe by a concrete block or the like.
[0019]
Further, in order to achieve the second problem, in the present invention, in the configuration in which the flange is spanned between the flanges, when the flange does not move with an average force against the flange and a large ground fluctuation occurs, It moved with respect to the flange to follow the fluctuation.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
As an embodiment of the present invention for achieving the first object, a pipe joint in which an insertion port of another pipe is inserted into a receiving port of one pipe is configured in order in the pipeline direction, and at least the two pipes are In the underground buried pipe structure having a pipe joint with one of the deformed pipes, a retaining rod is spanned between the flanges of the pipe joint at both ends of the deformed pipe, and both ends of the retaining collar are fixed to the flange, respectively. A configuration in which the gap between both flanges cannot be expanded can be adopted.
[0021]
As an example of a configuration in which the gap between the two flanges is not expandable, a locking member is fitted into the flange, the retaining rod is inserted into the locking member, and the retaining rod is prevented from coming off from the locking member. The thing provided with the protrusion for a use can be mentioned, A screwed nut etc. can be employ | adopted for the protrusion . At this time, if the bolt that contacts the flange is screwed in from the side wall of the locking member, the locking member and the flange can be securely fixed, and the influence of the fitting tolerance between the locking member and the flange is affected. Therefore, the construction accuracy of the design expansion / contraction amount of the pipe joint portion can be improved.
[0022]
The locking member includes a projecting piece applied to the outer surface of the pipe and a hook that extends from the projecting piece to the flange and engages, and the retaining member is inserted through the projecting piece. The end may be provided with a protrusion for preventing the locking member from coming off. In the case of a locking member having this configuration, there is an advantage that a retaining rod can be routed between flanges by bypassing the pressing wheel in the case of having a pressing wheel such as an A-shaped or K-shaped joint and a T bolt / nut. is there.
[0023]
In the structure of this locking member, if it is divided in the circumferential direction of the tube, it is preferable to provide a restraining member that extends over the entire outer circumference of each locking member to prevent the floating of each divided member.
[0024]
Also, in the middle of the retaining rod, a restraining tool is provided to reach the entire circumference of the deformed pipe, and with this restraining tool, the retaining rod is pressed against the outer peripheral surface of the pipe so that the retaining rod is aligned with the pipe as much as possible. Good.
[0025]
The embodiment of the present invention that achieves the second problem is that, in each of the above embodiments, one end of the retaining rod is fixed via an inclusion, and the inclusion is broken by an unbalanced force due to water pressure in the pipe. Instead, it is possible to adopt a configuration in which it is destroyed by the compressive force of the earthquake.
[0026]
The inclusions may be any as long as they exhibit their functions. For example, a foamed resin molded body can be adopted, and at that time, the foamed resin molded body is sandwiched between rigid plates, One in which one end of the retaining rod penetrates may be employed. Since the pressure is received by the rigid plate and uniformly applied to the entire resin molded body, even the foamed resin molded body can easily sufficiently withstand the non-average force.
[0027]
【Example】
One embodiment is shown in FIGS. 1 to 3, and this embodiment relates to a pipe line formed by a K-shaped joint. In the joint portion B between the straight pipes 1 and 1, the flange 1b of each receiving port 1a is divided in half. A ring-shaped locking member 20 is fitted, a retaining rod 30 made of a PC steel rod is inserted between the locking members 20, and nuts 31 are screwed and welded to both ends of the rod 30. The length of the retaining rod 30 is appropriately selected so that the space between the nuts 31 and 31 is the allowable extension length of the joint portion of both pipes 1 and 1. Further, the number of retaining rods 30 in the pipe circumferential direction is arbitrarily set to the equidistant.
[0028]
Further, in the joint portion B with the deformed pipe 1 ′, a retaining rod 30, a PC steel wire 30 ′ that can be bent, and the like are used, and the middle portion thereof is fastened by a half-constraint 35. As shown in FIG. 3, the restraining tool 35 is formed into a ring shape by fastening projecting pieces at both ends of the divided member with bolts and nuts 36. At this time, the nut 31 is brought into contact with the locking member 20 so that the gap between the flanges 1b and 1b cannot be expanded. If necessary, as shown in FIG. 29, the expansion between the adjacent straight pipes 1 and 1 between the joint portions is similarly disabled.
[0029]
The locking member 20 is formed into a ring shape by fastening the projecting pieces 21 and 21 at both ends of the half-divided divided member with bolts and nuts 22. The cross-section of the locking member 20 is U-shaped, and is fitted so that the flange 1b of the receiving port 1a enters the U-shaped portion 23. Protrusions 24 are formed on the both side walls of the U-shaped portion 23 at a circumference of about six equal parts, and the protrusions 24 are deeply locked to the flange 1b to reliably prevent left and right detachment. The number of protrusions 24 is arbitrary depending on the number of T bolts and nuts 5. The attachment of these locking members 20 and retaining rods 30 and 30 'is performed by excavating the required length around the existing pipeline (excavation groove H) as shown by the chain line in FIG.
[0030]
The pipe formed by the pipes 1, 1 ′, etc. connected to the locking member 20 by the retaining rods 30, 30 ′ is composed of the pipes 1,. With respect to the movement in the withdrawal direction, the insertion port 2a moves with respect to the receiving port 1a within a range regulated by the retaining rod 30, and the displacement is absorbed to maintain the watertightness. When the amount of displacement reaches an allowable amount, the nut 31 of the retaining rod 30 abuts against the locking member 20 to prevent further displacement, thereby preventing the insertion port 2a from coming out of the receiving port 1a. At this time, in the joint part B of the adjacent pipes 1 and 1, if the displacement amount of the insertion port 2a with respect to the receiving port 1a does not reach the allowable value, the force from the side of the tube 1 that is prevented from coming off is The tube 1 is moved until the displacement amount becomes an allowable value. On the other hand, in the joint portion B of the deformed pipe 1 ′, the deformed pipe 1 ′ and the adjacent straight pipes 1 and 1 are made immovable in the pipe axis direction by the retaining rods 30 and 30 ′ and integrated. . For this reason, it does not move by the non-average force P. In this way, the pipeline of this configuration absorbs the expansion and contraction by the entire pipeline while resisting the non-average force P.
[0031]
The number and thickness of the PC steel bars and the PC steel wires (retaining rods) 30 and 30 ′ in the pipe circumferential direction are appropriately set in consideration of the extension force of the applied joint portion B. Further, the elongation of these rods (wires) 30 and 30 'has a short wire length, and therefore does not need to be taken into consideration when the joint is pulled out.
[0032]
FIG. 4 shows an embodiment in which an adjustment bolt 25 is screwed into the other side wall of the U-shaped portion 23 of the locking member 20, and the locking member 20 is brought into contact with the flange 1b by contacting the bolt 25 with the flange 1b. Securely (without rattling). For this reason, the influence of the thickness tolerance etc. of the flange 1b decreases, and the construction accuracy of the design expansion / contraction amount can be increased.
[0033]
In the embodiment shown in FIGS. 5 to 9, the locking member 20 has a saddle shape straddling the flange 1b. FIGS. 6 and 7 show the receiving side 20a, and FIGS. 8 and 9 show the insertion side. The thing 20b is shown. Each includes a transmission portion (projection piece) 26 into which the retaining rods 30 and 30 'are inserted and locked, and a hook-shaped portion (hook) 27 locked to the flange 1b. Each locking member 20a, 20b is divided in half, and is fastened in a ring shape from the bolt / nut 22 as described above. In addition, the number of divisions of the locking member 20 including the locking members 20a and 20b is not limited to two and may be three or more.
[0034]
In this embodiment, as shown in FIG. 5 (a), both locking members 20a and 20b are fitted into one joint B, and the locking members 20a and 20b are hook-like portions 27 as shown in FIG. 5 (b). together with to shifting in the circumferential direction engaged to the flange 1b across flange 1b. At this time, the flange-like portion 27 and the locking piece 27a of the receiving side locking member 20a are inserted between the flange 1b and the push ring 4 so that the thickness t is made thinner than that of the opening side locking member 20b. It is easy. By reducing the thickness t of the receiving side locking piece 27a, the width w of the receiving side locking piece 27a is made wider than that of the insertion port side, and the same strength as the insertion port side with respect to the tensile force. It is said.
[0035]
In this embodiment, the positions of the retaining rods 30 and 30 'between the joint portions are shifted in the circumferential direction one by one in the direction of the pipe axis, but in both the locking members 20a and 20b, FIG. As shown in FIG. 3, the retaining rods 30 and 30 ′ can be made on the same axis over the entire length in the tube axis direction by making the holes 29 of the retaining rods 30 and 30 ′ long or by shifting in the circumferential direction.
[0036]
In the embodiment shown in FIG. 11 to FIG. 12, the locking members 20a and 20b are divided in accordance with the number of retaining rods 30 and 30 ′ in the above embodiment (divided saddle pieces 20a ′ and 20b ′). It is. In this embodiment, as shown in FIG. 11, the divided saddle pieces 20a ′ and 20b ′ are fastened with the half-constrained fixture 28 shown in FIG. As the fastening portion, either or both of the connecting portion of the transmission portion 26 and the hook-shaped portion 27 and the middle portion of the hook-shaped portion 27 are appropriately selected.
[0037]
FIG. 13 shows a construction example in the case of a T-shaped joint. The adjusting bolt 25 shown in FIG. 4 can also be adopted in this embodiment and each embodiment described later.
[0038]
In the embodiment shown in FIG. 14 to FIG. 17, the joint portion B which cannot be expanded, such as both ends of the deformed pipe 1 ′, is provided with a function of following ground changes such as an earthquake. 'Is a little longer, and an inclusion 40 that is not broken by the non-average force P of the water pressure in the pipe and broken by the compressive force due to the earthquake is interposed in the portion protruding from the locking member 20. As shown in FIGS. 14B and 15B, the inclusion 40 is obtained by integrating a foamed resin molded body 41 with an iron plate 42, and the strength of the molded body 41 is an added average. The power P is appropriately determined in consideration of the force P. As shown in FIGS. 14 and 16, the inclusion 40 may be interposed for each of the scissors 30 and 30 ′. However, as shown in FIGS. 15 and 17, the inclusion 40 may be ring-shaped, Moreover, several may be sufficient. 14 and 15 show the case of a K-type joint, and FIGS. 16 and 17 show the case of a T-type joint. Instead of the foamed resin molded body 41, other various materials can be adopted.
[0039]
In these embodiments, normally, due to the presence of the inclusion 40, the deformed pipe 1 ′ and the straight pipes 1 and 1 ′ on both sides thereof are fixed in the direction of the pipe axis by the retaining rods 30 and 30 ′. And are not moved by the non-average force P. If a large ground fluctuation such as an earthquake is applied, the inclusion 40 is destroyed due to the fluctuation, and the movement of one end of the retaining rods 30 and 30 ′ toward the locking member 20 is allowed. Also in the joint part B and the like, the movement in the tube axis direction is allowed to follow the fluctuation. Its follow-up is performed until the nut 31 abuts against the locking member 20 through the iron plate 42, thereafter is retained in the joint portion B of the two pipe 1, 1 'are.
[0040]
In these embodiments, the inclusions 40 are provided only at one end of the retaining rods 30 and 30 '. However, the inclusions 40 may be provided at the other end, that is, both ends of the retaining rods 30 and 30'. In this way, the follow-up width can be widened. Further, each example is a case of A, K, and T type joints, but it goes without saying that the present invention can also be applied to a joint having an anti-separation and expansion / contraction function such as NS and SII types. is there. In this case, in the joint B ′ shown in FIG. 29, an intervening structure of inclusions 40 in which the liner 9 is omitted is employed.
[0041]
The pipe structure of the deformed pipe according to the present invention can be adopted in any of new pipe laying work for fluid transportation piping including water supply, existing pipe renewal work, and pipe line change work accompanying other company pipe laying.
[0042]
【The invention's effect】
In the present invention, as described above, the flanges are spanned between the flanges at both ends of the deformed pipe, and the flanges are integrated with each other by using the flanges. The ability to prevent withdrawal can be applied. In addition, even if the installation location of the deformed pipe is close and the integrated length overlaps, by adding inclusions that are crushed by the seismic force, it is possible to continue the integration of the pipeline over a wide area during an earthquake. Can be prevented. In this way, it is possible to construct more flexible structures that are advantageous to earthquakes than pipes designed and constructed by conventional methods.
[Brief description of the drawings]
FIG. 1 is a partially cut front view of an embodiment. FIG. 2 shows the pipe joint portion of FIG. 1, (a) is a cut right side view, and (b) is a cut front view of the main part. FIG. 4 shows another embodiment, (a) is a cutaway front view of the main part, (b) is a right side view of the cut main part. FIG. 5 shows another embodiment, FIG. 6A is a cross-sectional view taken along the line AA of FIG. 6A. FIG. 6 is a perspective view of the receiving-side locking member of the same embodiment. FIG. The left side view of the stopper member, (b) is the same cut front view, (c) is the right side view [FIG. 8] The perspective view of the insertion side locking member of the same embodiment [FIG. FIG. 10B is a left side view of the locking member, FIG. 10B is a cutaway front view thereof, and FIG. 10C is a right side view thereof. FIG. 10A is a side view of another example of the locking member. Another embodiment is shown, (a) is a cutaway front view of the main part, (b) is a cross-sectional view taken along line AA of (a). 12 (a) is a perspective view of the receiving side split saddle piece of the embodiment, FIG. 12 (b) is a perspective view of the insertion side split saddle, and FIG. 12 (c) is a perspective view of the restraint tool. 14A is a cut front view of another embodiment, FIG. 14B is a cross-sectional view of the inclusion, and FIG. 15A is a cut view of the other embodiment. Front view, (b) is a cross-sectional view of the inclusions. [FIG. 16] Front cutaway view of the main part of another embodiment. [FIG. 17] Front cutaway view of the main part of another embodiment. FIG. 19 is a cross-sectional view of the main part of another pipe joint. FIG. 20 is a cross-sectional view of the main part of another pipe joint. FIG. 21 is a cross-sectional view of the main part of the other pipe joint. [Fig. 23] Cross-sectional view of the main part of another pipe joint [Fig. 24] Cross-sectional view of the main part of another pipe joint [Fig. 25] Cross-sectional view of the main part of other pipe joint [Fig. Cross-sectional view of the main part of the pipe fitting [Fig.27] FIG. 28 is a sectional view of the main part of another pipe joint. FIG. 29 is an explanatory diagram of piping. FIG. 30 is an explanatory diagram of conventional piping. FIG. 31 is an explanatory diagram of conventional piping. b) Both cutting piping explanatory diagram [Fig. 33] Cutting piping explanatory diagram [Explanation of symbols]
1, 1 'pipe 1a receiving port 1b receiving flange 2a insertion port 20, 20a, 20b locking member 20a', 20b 'split saddle piece 22 bolt / nut 23 locking member U-shaped portion 24 protruding portion of locking member 25 Adjustment bolt 26 Transmission part (projection piece)
27 Hook-shaped part (hook)
28 Restraint 30, 30 'Retaining rod (PC steel bar, PC steel wire)
31 nuts (stop for the butt section missing)
35 Restraint 40 Inclusion 41 Foamed resin molded body 42 Rigid plate (iron plate)

Claims (4)

A pipe joint (B) in which an insertion opening (2a) of another pipe (1, 1 ') is inserted into a receiving opening (1a) of one pipe (1, 1') is configured in order in the pipe line direction, In the underground buried pipe structure having a pipe joint (B) in which at least one of the two pipes is a deformed pipe (1 ′),
The profiled pipe (1 ') the U-shaped portion of the U-shaped cross section of the locking member (20) towards the flange the flange (1b) (1b) at both ends of the pipe joint (23) flange in (1b ) fitted so enters, flanges (1b which fitted the locking member (20), 1b) 'with to pass over the), the retaining rod (30' stop rod (30 exits between the end of) The locking member is inserted into the retaining member (30 '), and a retaining projection (31) is provided at the end of the retaining member (30'). A buried underground pipe structure characterized in that it cannot be expanded between both flanges (1b, 1b) by being fixed to 1b). A pipe joint (B) in which an insertion opening (2a) of another pipe (1, 1 ') is inserted into a receiving opening (1a) of one pipe (1, 1') is configured in order in the pipe line direction, In the underground buried pipe structure having a pipe joint (B) in which at least one of the two pipes is a deformed pipe (1 ′),
The profiled pipe (1 ') passing over the flange (1b) retaining rod between (30 at both ends of the pipe joint'), the locking member of the previous SL flange (1b) of the retaining rod (30 ') ( 20a, 20b) a projecting piece (26) applied to the outer surface of the pipe, and a hook (27 ) extending from the projecting piece (26) toward the flange (1b) and straddling the flange (1b). ), And the retaining rod (30 ′) is inserted through the protruding piece (26), and the retaining projection (31) from the locking member is attached to the end of the retaining rod (30 ′). A buried underground pipe structure characterized in that the space between the flanges (1b, 1b) is not expandable. A half-circular annular restraining tool (35) is provided on the middle outer periphery of the retaining rod (30 '), and the projecting pieces at both ends of the half-dividing member of the restraining tool (35) are fastened with bolts and nuts (36). it allows soil buried duct structure according to claim 1 or 2, characterized in that the tube (1 ') the retaining rod reached the entire periphery (30') to urge the Kangaishu surface. When the pipe joint (B) has a function of expanding and contracting in the pipe axis direction , the inclusion (40) is attached to one end of the retaining rod (30 ′) inserted through the locking member (20, 20a, 20b). the exit is provided a stop projection (31) with Mashimashi through, the inclusions (40) does not destroy the non-round force (P) by conduit pressure, and destroyed by the compressive force due to an earthquake, the One end of a retaining rod (30 ′) is allowed to move in the direction of the locking member (20, 20a, 20b) to allow movement of the deformed tube (1 ′) in the tube axis direction, and the retaining member When the protrusion (31) and the locking member (20, 20a, 20b) come into contact with each other, the pipe joint (B) of both the pipes (1, 1 ′) is to be prevented from coming off thereafter. The underground buried pipe structure according to any one of claims 1 to 3 .

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