JP4333896B2 - Detachment prevention device for expansion joints - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a device for preventing an expansion joint portion from being detached from a receiving pipe cylindrical body and an insertion cylindrical body connected in the middle of a fluid transport pipe such as a water pipe, a gas pipe, and a plant pipe.
[0002]
[Prior art]
As a device for preventing the detachment of the expansion joint portion in this type of fluid transport pipe, for example, a stopper type device as described in JP-A-2001-263565 is known.
[0003]
FIG. 6 is a cross-sectional view of the stopper-type detachment prevention device. The detachment prevention device 01 has a receptacle cylindrical body 02 and an insertion cylindrical body 03. The receptacle cylindrical body 02 is an insertion cylindrical body. A cylindrical portion 03a of 03 is supported by a sealing device 04 so as to be slidable and sealable. The stopper portion 03b of the insertion tubular body 03 is movable within the range of the annular groove 05 formed on the inner surface of the receiving tubular body 02, and a relative pulling force or pushing force is applied to both the tubular bodies 02 and 03. When acted, the stopper portion 03b comes into contact with the side wall portion 02A or 02B of the receiving end tubular body 02 to prevent the both from being detached.
[0004]
Further, during transportation of the detachment prevention device 01 and during piping work, the tubular bodies 02 and 03 are temporarily connected to the flanges 02C and 03c so that the expansion joints do not move relative to each other. Connected by 06.
[0005]
However, the above-mentioned detachment prevention device 01 is constructed with a connecting bolt 06, and after connecting to the fluid transport pipe, it must be used with the connecting bolt removed in order to perform an expansion joint function due to an earthquake or ground subsidence, The removal was particularly troublesome when the hydraulic performance test was carried out in the ground.
[0006]
Therefore, a tie rod system as shown in FIG. 7 is also known as an expansion joint detachment prevention device that eliminates the troublesome work of removing the connecting bolt after embedding. FIG. 7 is a cross-sectional view of a conventional tie rod type separation preventing device. The separation prevention device 08 has a receiving end tubular body 09 having a spherical portion 09a at one end and a sealing device 010 connected to the receiving end tubular body 09. It is composed of an insertion cylindrical body 011 having a spherical surface portion 011a at one end supported so as to be slidable and sealable.
[0007]
The separation preventing device 08 includes a flange 012b of the swing pipe joint 012 having a spherical surface 012a fitted on the spherical surface 09a and a flange 013b of the swing pipe joint 013 having a spherical surface 013a fitted on the spherical face 011a. The tie rods 015 to be connected are immovably connected. The tie rod 015 is formed with a reduced diameter portion 015a that can be broken when an abnormal load such as an earthquake or ground subsidence is applied.
[0008]
Therefore, the receiving tubular body 09 and the insertion tubular body 011 are maintained in an immobile state by the tie rod 015 during transportation, construction of the separation preventing device 08, or a hydraulic performance test after embedding. However, when an abnormal load such as an earthquake or ground subsidence is applied, the reduced diameter portion 015a is broken and the function as an expandable joint can be exhibited. The expansion / contraction range at this time is a range in which the protrusion 011b formed on the outer peripheral surface of the insertion tubular body 011 contacts the ring protrusion 09b formed at the tip of the receiving tubular body 09 or the annular protrusion 09c provided in the vicinity of the sealing device 010. Is limited to.
[0009]
[Problems to be solved by the invention]
However, in the above-described conventional tie rod type separation preventing device 08, the relative movement between the receiving tubular body 09 and the insertion tubular body 011 is restrained by the tie rod 015, and when the tie rod 015 breaks, it is a separate part from the tie rod 015. Since the protrusion formed on a certain insertion tubular body 011 is configured to be prevented from being detached by engaging the ring body 09b and the annular protrusion 09c of the receiving tubular body 09, the structure is complicated. In addition, once the reduced diameter portion for setting the breaking force was set, it was difficult to change it.
[0010]
The present invention has been made in view of the above problems, and the pressing member that restricts relative movement between the receiving tubular body and the insertion tubular body also functions as a component for preventing separation, thereby simplifying the configuration. And it aims at providing the detachment prevention device of the expansion joint part by which the setting of breaking force is easy.
[0011]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention comprises a receptacle cylindrical body and an insertion cylindrical body connected in the middle of a fluid transport pipe, and the cylindrical portion of the receptacle cylindrical body is a cylindrical portion of the insertion cylindrical body. A device for preventing the separation of the expansion joint that supports the sliding and sealing,
A plurality of boss portions are projected evenly on the outer periphery of the cylindrical portion of the receptacle tubular body on the side of the insertion tubular body , a screw hole having a predetermined depth for receiving a pressing member in the boss portion, and a through angle at a bottom portion of the screw hole. A hole is formed toward the center of the cylinder ,
A plurality of ring grooves are engraved on the outer periphery of the cylindrical portion of the insertion cylindrical body, and a bulging portion provided with an annular seal groove on the receiving cylindrical body side is formed,
An annular seal member that is slidably contacted with an inner periphery of the cylindrical portion of the receptacle cylindrical body is attached to the annular seal groove of the bulge portion,
The pressing member is screwed into the screw hole, a pin body including a shaft portion having a square cross section with a lower end surface as a contact surface, a circular head portion that can be inserted into the screw hole at the upper end, and the pin body. A V-shaped groove having the same shape as the ring groove on the outer periphery of the cylindrical portion of the insertion cylindrical body is formed at the same pitch on the tip abutting surface of the shaft portion. ,
By the screwing of the push screw, the V groove on the tip contact surface of the shaft portion is pressed and engaged with the ring groove of the insertion cylindrical body,
Only when an abnormal load is applied to the fluid transport pipe, both the cylindrical bodies slide relative to the pressing force of the pressing member, and the sliding range is inserted into the pin body of the pressing member. It is characterized by preventing withdrawal is regulated by the bulged portion of the cylindrical body.
According to this feature, the pin body is inserted into the screw hole of the boss portion, the shaft portion of the pin body is inserted into the through-angle hole at the bottom of the screw hole, the push screw is screwed into the screw hole, and the shaft portion is Since the V groove on the tip contact surface is pressed and engaged with the ring groove of the insertion cylindrical body, relative sliding between the receiving cylindrical body and the insertion cylindrical body is reliably prevented, and an abnormal load is applied to the fluid transport pipe. When it acts, the structure can be simplified by providing the function of preventing separation, and the set load at which relative movement starts when an abnormal load is applied can be adjusted by adjusting the pushing force against the pressing member.
[0013]
Further, since no rotational force acts on the pin body, it is possible to accurately adjust the set load at which the relative movement starts without crushing the ring groove.
[0014]
In the expansion joint separation preventing device, the abnormal load is preferably larger than the load due to water pressure applied in the water pressure performance test.
If it does in this way, the attachment / detachment work of a test jig will be easy by maintaining an expansion joint part in a fixed state at the time of a water pressure performance test, and accurate performance test data can be obtained.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the expansion joint part detachment preventing device of the present invention will be described with reference to FIGS. 1, 2, 4, and 5. 1 is a cross-sectional view showing a state in which a gate valve provided in the middle of a water supply main and a water supply main are connected via an expansion joint, FIG. 2A is a cross-sectional view of the expansion joint, and FIG. Fig. 4A is a cross-sectional view taken along the line BB of Fig. 1A and a view taken in the direction of arrow C. Fig. 4 is an enlarged view of portion A of Fig. 1. It is a perspective view of a pressing member.
[0016]
In FIG. 1, P is a water supply main pipe such as a fluid transport pipe. When the gate valve V is attached to this water supply main pipe P, the separation preventing device 1 for the expansion joint portion of the present invention is simultaneously connected in an uninterrupted water state. Is done.
[0017]
The separation preventing device 1 includes, for example, a receiving tube cylindrical body 2 connected to the flange F1 of the gate valve V via the flange F, and an insertion cylinder connected to the flange F2 on the other end of the water supply main pipe P via the flange F. It has a joint portion composed of the body 4.
[0018]
As shown in FIGS. 2 (a) and 2 (b), a flange F is formed at one end of the cylindrical portion 5 and the boss portions 10 are projected evenly at four locations on the outer periphery of the other end side. In addition, the insertion cylindrical body 4 is formed with a flange F at one end of a cylindrical portion 6 having an inner diameter that can be inserted into the cylindrical portion 5, and a plurality of ring grooves 6 a serving as concave and convex V-shaped grooves on the outer periphery thereof. Are engraved at a minute pitch, and an annular seal member 8 is mounted in an annular seal groove 7a formed in the bulging portion 7 on the outer periphery of the other end side.
[0019]
Specifically, as shown in FIGS. 4 and 5, the boss portion 10 of the receptacle tubular body 2 is formed with a screw hole 14 having a predetermined depth toward the center for receiving a pressing member to be described later. A through-angle hole 15 having a smaller diameter than the screw hole 14 is formed at the bottom of the hole 14.
[0020]
The pressing member includes a pin body 16 including a shaft portion 16a having a rectangular cross section with a lower end surface as a contact surface, a circular head portion 16b that can be inserted into the screw hole 14 at an upper end, and a circular shape of the pin body 16. It is comprised from the press screw 12 which presses the head 16b, and the V groove | channel of the same shape as the ring groove 6a carved on the cylinder part 6 outer periphery of the insertion cylinder 4 at the front-end | tip contact surface of the axial part 16a 16c is engraved at the same pitch.
[0021]
Next, a procedure for assembling the separation preventing device will be described with reference to FIGS.
[0022]
First, when the gate valve V is connected between the water supply main pipes P cut in a predetermined length range in an undisturbed water state, as shown in FIG. The pin body 16 is inserted into the screw hole 14 formed in the portion 10, and then the push screw 12 is screwed into the screw hole 14 and screwed.
[0023]
Since the pin body 16 at this time is temporarily fixed, the push screw 12 is screwed in a little, and the tip of the pin body 16 is set in a state in which it can move backwards at least until it is flush with the inner peripheral surface of the cylindrical portion 5.
[0024]
Next, the annular seal member 8 at the distal end of the tubular portion 6 of the insertion tubular body 4 is received in the state where the distal end of the pin body 16 is moved backward to be flush with the inner peripheral surface of the tubular portion 5. It inserts in the inside of the cylinder part 5 and makes it the state of FIG.2 (b).
[0025]
When the separation preventing device 1 is assembled in this way, as shown in FIG. 1, the flange F of the receiving end tubular body 2 held in a state where the expansion joint portion is contracted to the flange F1 of the one end side of the gate valve V is reduced. Connecting. Subsequently, the flange F of the insertion cylindrical body 4 cylinder part 6 is moved to an axial direction, and it couple | bonds with the flange F2 of the water supply main pipe P other end cut | disconnected.
[0026]
When the detachment prevention device 1 is connected between the flange F1 provided at one end of the gate valve V and the flange F2 provided at the other end of the water supply main pipe P, the push screw 12 is screwed to screw the tip of the pin body 16 The V-groove 16c is pressed and engaged with the ring groove 6a on the outer periphery of the cylindrical portion 6.
[0027]
Next, the operation of the expansion joint when an abnormal load is applied to the water supply main pipe P will be described with reference to FIGS. FIG. 3A is an operation explanatory diagram when the separation preventing device moves in the compression direction due to an abnormal load, and FIG. 3B is an operation explanatory diagram when the separation prevention device moves in the pulling direction due to the abnormal load. .
[0028]
First, normally, the detachment prevention device 1 connected between the gate valve V and the water supply main pipe is engaged with the ring groove 6a on the outer periphery of the cylindrical portion 6 by pressing and engaging the V groove 16c at the tip of the pin body 16; The cylindrical portion 5 of the receiving cylindrical body 2 and the cylindrical portion 6 of the insertion cylindrical body 4 are supported in a non-slidable state with a predetermined drag force. The drag is set to be equal to or higher than the load due to the water pressure applied in the water pressure performance test, for example.
[0029]
Next, when an excessive load such as an earthquake larger than the load due to the water pressure applied in the water pressure performance test is applied to the water supply main P, as shown in FIG. When a compressive load exceeding the drag force is applied, the tip of the cylindrical portion 5 of the receptacle cylindrical body 2 moves until it contacts the flange F of the insertion cylindrical body 4.
[0030]
3B, when a tensile load exceeding the drag acts in the axial direction of the water supply main pipe P, the tip end of the pin body 16 protruding into the cylindrical portion 5 is the cylinder of the insertion cylindrical body 4. It moves until it contacts the bulging part 7 of the outer periphery of the part 6 other end side.
[0031]
Therefore, according to the detachment preventing device 1 configured as described above, in the state where the cylindrical portion 5 of the receiving cylindrical body 2 supports the cylindrical portion 6 of the inserting cylindrical body 4 so as to be slidable and sealable, By pushing the pin body 16 toward the outer peripheral surface of the cylindrical portion 6 of the insertion cylindrical body 4 with the push screw 12 screwed into the screw hole 14 on the outer periphery of the cylindrical portion 5 of the cylindrical body 2, the abnormal load is supplied to the water supply main pipe. Only when acting on P, both the cylindrical portions 5 and 6 slide relative to each other against the pushing force of the pressing screw 12, and this sliding range is the cylindrical portion of the pin body 16 and the insertion cylindrical body 4. 6 Since it is regulated by the bulging portion 7 on the outer periphery on the other end side, mutual detachment can be prevented.
[0032]
Further, a plurality of concave and convex ring grooves 6a are formed on the outer peripheral surface of the cylindrical portion 6 of the insertion cylindrical body 4, and a V having the same shape as the ring groove 6a is formed on the contact surface of the tip end of the pin body 16 of the pressing member. Since the grooves 16c are engraved at the same pitch, the sliding movement of the receiving tubular body 2 and the insertion tubular body 4 is caused by the pressing engagement of the V groove 16c on the contact surface of the pin body 16 with the ring groove 6a. Can be reliably prevented. The V-groove 16c does not need to have the same shape as the ring groove 6a, and may be an uneven portion as long as it can be engaged with the ring groove 6a.
[0033]
Then, the pin member 16 of the pressing member is inserted into and protruded from the through-hole 15 formed in the bottom of the screw hole 14 into the inside of the cylindrical portion 5, and the ring groove on the outer peripheral surface of the cylindrical portion 6 of the insertion cylindrical body 4. Since it is supported so as to be movable toward 6a, the rotation of the pin body 16 is restricted, and the set load at which the relative movement starts can be accurately adjusted without crushing the uneven ring groove 6a.
[0034]
Further, as described above, the drag obtained by the press engagement between the V groove 16c at the tip of the pin body 16 and the ring groove 6a on the outer periphery of the cylindrical portion 6 is the hydraulic pressure that applies the abnormal load that becomes this limit in the hydraulic performance test. It is set as an excessive load such as an earthquake that is larger than the load due to, and at the time of hydraulic performance test, the expansion joint part is kept stationary, so it is easy to attach and remove the test jig, Not only can accurate performance test data be obtained, but also the handling of the separation prevention device during transportation and piping work is easy.
[0035]
【The invention's effect】
The present invention has the following effects.
[0036]
(A) According to the invention of claim 1, the pressing member reliably prevents relative sliding between the receiving tubular body and the insertion tubular body, and also prevents the separation when an abnormal load acts on the fluid transport pipe. In addition, the configuration can be simplified and the set load at which relative movement starts when an abnormal load is applied can be adjusted by adjusting the pushing force with respect to the pressing member.
[0038]
Further, since no rotational force acts on the pin body, it is possible to accurately adjust the set load at which the relative movement starts without crushing the ring groove.
[0039]
(B) According to the invention of claim 2 , when the hydraulic performance test is performed, the expansion joint portion is maintained in an immobile state, so that the test jig can be easily attached and removed, and accurate performance test data can be obtained. Can do.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a device for preventing an expansion joint part from being detached according to an embodiment of the present invention, wherein a gate valve provided in the middle of a water supply main and a water supply main are connected via an expansion joint. It is sectional drawing shown.
2A is a cross-sectional view of an expansion joint, and FIG. 2B is a cross-sectional view taken along the line BB and a view in the direction of arrow C in FIG.
3A is an operation explanatory diagram when the separation preventing device moves in the compression direction due to an abnormal load, and FIG. 3B is an operation explanatory diagram when the separation prevention device moves in the pulling direction due to the abnormal load. is there.
4 is an enlarged view of a portion A in FIG.
FIG. 5 is a perspective view of a pressing member that presses against an outer peripheral surface of a cylindrical portion of an insertion tubular body of an expansion joint.
FIG. 6 is a cross-sectional view of a conventional stopper-type detachment prevention device.
FIG. 7 is a cross-sectional view of a conventional tie rod type separation preventing device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Detachment prevention apparatus 2 Receptor cylindrical body 4 Insert cylindrical body 5, 6 Tube part 6a Ring groove 7 Bulging part 7a Annular seal groove 8 Annular seal member 10 Boss part 12 Push screw 14 Screw hole 15 Through-angle hole 16 Pin body 16a Shaft portion 16b Circular head portion 16c V groove F, F1, F2 Flange P Water supply main pipe V Gate valve

Claims (2)

An expansion joint portion comprising a receptacle cylindrical body and an insertion cylindrical body connected in the middle of the fluid transport pipe, and the cylindrical portion of the receptacle cylindrical body supports the cylindrical portion of the insertion cylindrical body in a slidable and sealable manner Detachment prevention device,
A plurality of boss portions are projected evenly on the outer periphery of the cylindrical portion of the receptacle tubular body on the side of the insertion tubular body , a screw hole having a predetermined depth for receiving a pressing member in the boss portion, and a through angle at a bottom portion of the screw hole. A hole is formed toward the center of the cylinder ,
A plurality of ring grooves are engraved on the outer periphery of the cylindrical portion of the insertion cylindrical body, and a bulging portion provided with an annular seal groove on the receiving cylindrical body side is formed,
An annular seal member that is slidably contacted with an inner periphery of the cylindrical portion of the receptacle cylindrical body is attached to the annular seal groove of the bulge portion,
The pressing member is screwed into the screw hole, a pin body including a shaft portion having a square cross section with a lower end surface as a contact surface, a circular head portion that can be inserted into the screw hole at the upper end, and the pin body. A V-shaped groove having the same shape as the ring groove on the outer periphery of the cylindrical portion of the insertion cylindrical body is formed at the same pitch on the tip abutting surface of the shaft portion. ,
By the screwing of the push screw, the V groove on the tip contact surface of the shaft portion is pressed and engaged with the ring groove of the insertion cylindrical body,
Only when an abnormal load is applied to the fluid transport pipe, both the cylindrical bodies slide relative to the pressing force of the pressing member, and the sliding range is inserted into the pin body of the pressing member. separation preventing device for expansion joints, characterized in that to prevent the withdrawal is regulated by the bulged portion of the cylindrical body.   The expansion joint part separation preventing device according to claim 1, wherein the abnormal load is larger than a load due to water pressure applied in a water pressure performance test.

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