JP3677446B2 - Seismic duct structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe structure in which a pipe joint portion has no separation preventing function in a pipe line having no separation preventing function.
[0002]
[Prior art]
In the joint type of ductile pipes used for construction of liquid transportation facilities such as water and sewage (hereinafter referred to as pipes), the joints such as A type, K type and T type shown in FIG. 13 to FIG. Although it has, it does not have a function of preventing separation. That is, in the A-shaped joint and the K-shaped joint shown in FIGS. 13 and 14, the insertion port 2a of the second tube 1 is inserted into the reception port 1a of the first tube 1, and between the reception port 1a and the insertion port 2a. After the rubber ring 3 is interposed, the push ring 4 is fastened to the receiving flange 1b with T bolts and nuts 5, and the rubber ring 3 is press-fitted by the fastening. The T-shaped joint shown in FIG. 15 has a configuration in which after inserting the rubber ring 3 in the receiving port 1a, the insertion port 2a is inserted into the receiving port 1a.
[0003]
Any of these joint structures absorbs expansion and contraction between the tubes 1 and 1 by moving the second tube 1 in the axial direction with respect to the first tube 1 as long as the insertion port 2a does not come out from the receiving port 1a. In addition, it exhibits ground following performance 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 joints, a lock ring 6 is provided on the inner surface of the receiving port 1a, a projection 7 is provided on the insertion port 2a, and the projection 7 is engaged with the lock ring 6 so that the insertion port 2a is removed from the receiving port 1a. Stop.
[0005]
In recent years, since seismic resistance is desired, the expansion joints with the above-mentioned separation prevention function such as NS, S, and SII have been adopted for the pipes. Something without a blocking function 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.
[0006]
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. 18, ring-shaped plates 11 and 12 are respectively fitted to the receiving port 1a and the insertion port 2a, 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.
[0007]
[Problems to be solved by the invention]
In the joint structure shown in FIG. 18, since one plate 12 is fixed to the insertion port 2a by biting, if a large pulling force acts 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.
[0008]
It is an object of the present invention to reliably prevent the separation when the function is added to a pipeline having no separation prevention function.
[0009]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention first assumes a pipe joint comprising a flanged receiving port, spans a flange between adjacent flanges of the pipe, and the flange connects the flanges. It was decided to regulate separation.
[0010]
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 possibility of breakage of the separation preventing function is minimized.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
As an embodiment of the present invention, the insertion opening of the second pipe is removably inserted into the receiving opening with the flange of one pipe, and the insertion opening of the third pipe is inserted into the receiving opening with the flange of the second pipe. In the pipe structure in which the pipe is constructed in the same manner thereafter, a retaining rod is spanned between the flanges of the adjacent tubes, and the retaining rod is inserted into the receptacles of both the tubes. A configuration is adopted in which the flange is allowed to extend so that the mouth does not come out and is locked to the flange so as to prevent further extension.
[0012]
As a means for locking the retaining rod to the flange, a retaining member is fitted into the flange, the retaining rod is inserted into the retaining member, and the end of the retaining rod is detached from the retaining member. A structure provided with a stopping projection can be employed. 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.
[0013]
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 the flanges by bypassing the insertion wheel in the case of having a pushing wheel such as an A-shaped or K-shaped joint and a T bolt / nut. is there.
[0014]
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.
[0015]
【Example】
FIG. 1 and FIG. 2 show an embodiment. This embodiment relates to a pipe line formed by a K-shaped joint, and a half ring-shaped locking member 20 is fitted to the flange 1b of each receiving port 1a. 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.
[0016]
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 the U-shaped portion 23 is fitted to the flange 1b of the receiving port 1a. 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 locking member 20 and the retaining rod 30 are attached by excavating the required length around the existing pipeline (excavation groove H) as shown by a chain line in FIG.
[0017]
The pipe formed by the pipes 1... Connected by the locking member 20 and the retaining rod 30 has the insertion port 2a with respect to the receiving port 1a when the pipes 1. It moves within the range regulated by the retaining rod 30 and absorbs the displacement to maintain water tightness. 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, if the displacement amount of the insertion port 2a with respect to the receiving port 1a does not reach the allowable value in the joint portion of the adjacent tubes 1, 1, with the force from the tube 1 side from which the retaining is prevented, The tube 1 is moved until the amount of displacement reaches an allowable value. In this way, the pipe having this configuration absorbs the expansion and contraction by the whole pipe.
[0018]
The number and thickness of the retaining rods 30 in the pipe circumferential direction are appropriately set in consideration of the extension force of the applied joint portion. In addition, instead of the PC steel rod, a PC steel wire can be used for the retaining rod 30. Since the elongation of these rods (wires) 30 is short, it is not necessary to consider the withdrawal of the joint.
[0019]
FIG. 3 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.
[0020]
In the embodiment shown in FIGS. 4 to 8, the locking member 20 has a saddle shape straddling the flange 1b. FIGS. 5 and 6 show the receiving side 20a, and FIGS. 7 and 8 show the insertion side. The thing 20b is shown. In either case, it is composed of a transmission portion (projection piece) 26 through which the retaining rod 30 is 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.
[0021]
In this embodiment, as shown in FIG. 4 (a), both locking members 20a and 20b are fitted into one joint, and the locking members 20a and 20b are provided with hook-shaped portions 27 as shown in FIG. 4 (b). Shift in the circumferential direction and engage with the 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.
[0022]
In this embodiment, the position of the retaining rod 30 between each joint portion is shifted in the circumferential direction sequentially toward the tube axis direction, but as shown in FIG. 9 in both the locking members 20a and 20b. In addition, by making the hole 29 of the retaining rod 30 a long hole or shifting in the circumferential direction, the retaining rod 30 can be on the same axis over the entire length in the tube axis direction.
[0023]
The embodiment shown in FIGS. 10 to 11 is obtained by dividing the locking members 20a and 20b in accordance with the number of retaining rods 30 (divided saddle pieces 20a ′ and 20b ′). In this embodiment, as shown in FIG. 10, the divided saddle pieces 20 a ′ and 20 b ′ are fastened with the halved restraining tool 28 of 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.
[0024]
FIG. 12 shows a construction example in the case of a T-shaped joint. This embodiment can also employ the adjusting bolt 25 shown in FIG.
[0025]
【The invention's effect】
As described above, according to the present invention, the flange is spanned between the flanges of the adjacent pipes, and the contact between the flanges is regulated by the flange to prevent the joint portion from coming out. The effect is certain.
[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. An Example is shown, (a) is a principal part cutting front view, (b) is a principal part cutting | disconnection right side view. FIG. 4 shows another Example, (a) is a principal part cutting front view, (b) FIG. 5A is a perspective view of the receiving side locking member of the same embodiment. FIG. 6A is a left side view of the locking member, and FIG. Front view, (c) is the right side view. FIG. 7 is a perspective view of the insertion port side locking member of the embodiment. FIG. 8A is a left side view of the locking member, and FIG. Cut front view, (c) is the right side view. [FIG. 9] (a), (b) is a side view of the other side of the locking member. [FIG. 10] Another embodiment is shown. FIG. 11B is a sectional view taken along the line AA of FIG. 11A. FIG. 11A is a receiving side of the same embodiment. FIG. 12 is a perspective view of the split saddle piece, FIG. 13B is a perspective view of the insertion side split saddle, FIG. 12C is a perspective view of the restraint tool, and FIG. Fig. 14 is a cross-sectional view of an essential part of a K-shaped pipe joint. Fig. 15 is a cross-sectional view of an essential part of a T-shaped pipe joint. ] Cross-sectional view of relevant parts of SII type pipe joint [Fig. 18] Cross-sectional view of relevant parts of conventional example
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 locking projection (nut)
25 Adjustment bolt 26 Transmission part (projection piece)
27 Hook-shaped part (hook)
28 Restraint 30 Retaining rod (PC steel bar, PC steel wire)
31 Nut (Protrusion for retaining)
35 Restraint

Claims (4)

The insertion port 2a of the second tube 1 is removably inserted into the receiving port 1a with the flange 1b of the first tube 1, and the third tube 1 is inserted into the receiving port 1a with the flange 1b of the second tube 1 In the pipe structure in which the mouth 2a is inserted and removably inserted and the pipe line is constructed in the same manner,
The flanges 1b of the adjacent tubes 1,1, in 1b, fitted with their respective U-shaped cross section of the locking member 20 in the retaining state is fitted to the U-shaped portion 23 in the axial direction of the tube, at both A retaining rod 30 is inserted through the locking member 20 of the flanges 1b and 1b and is passed between the flanges 1b and 1b, and protrusions 31 for retaining from the locking member 20 are provided at both ends of the retaining rod 30. The retaining rods 30 provided respectively allow the extension between the flanges 1b and 1b so that the receiving port 1a and the insertion port 2a of the pipes 1 and 1 do not come out, and prevent further extension. A seismic duct structure which is locked to the flange 1b. Seismic piping structure according to claim 1, characterized in that screwed abutting bolts 25 to the flange 1 b from the side wall of said locking member. The insertion port 2a of the second tube 1 is removably inserted into the receiving port 1a with the flange 1b of the first tube 1, and the third tube 1 is inserted into the receiving port 1a with the flange 1b of the second tube 1 In the pipe structure in which the mouth 2a is inserted and removably inserted and the pipe line is constructed in the same manner,
A protruding piece 26 applied to the flanges 1b and 1b of the adjacent pipes 1 and 1 on the outer surface of the pipe 1 between the flanges 1b and 1b, and extends from the protruding piece 26 to the flange 1b toward the protruding piece 26. The locking members 20a and 20b, each of which includes a hook 27 for locking so as not to be disengaged, are respectively attached, and the retaining rods 30 are inserted into the protruding pieces 26 of the both locking members 20a and 20b, respectively. spanned between 26, the retaining locking member 20a at both ends of the rod 30, provided with a locking projection 31 from coming off the 20b respectively, the retaining rod 30 is received in the two pipe 1,1 A seismic duct structure characterized by being attached to the flange 1b so as to allow extension between the flanges 1b and 1b so that the opening 1a and the insertion opening 2a do not come out, and prevent further extension. Said engaging member 20a, 20b is the apparatus having divided in the circumferential direction of the tube 1, according to claim 3, characterized in that a restraining member 28 over the outer periphery the total length of the respective locking member Seismic pipeline structure.

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