JPH0791574A - Coupling for culvert - Google Patents

Abstract

PURPOSE:To securely prevent deformation and breakage of members of a coupling due to an earthquake or the like by disposing a damper capable of being compressively deformed by a water pressure between annular anchoring members fixed to the ends of a pair of culverts to be connected and flexible water stoppers provided around the fixing members. CONSTITUTION:A coupling 1 is provided with a fixing members 2, 2' fixed at the opposite surfaces of a pair of culverts. A large-diameter cylindrical body 9 is loosely fitted to a bar 7 of a durable member 5 for connecting the fixing member 2, 2' within a predetermined range in such a manner as to be brought into or out of relative contact with each other. A primary and a secondary flexible water stopper 10, 11 are disposed coaxially on the outer periphery of an annular row of the cylindrical body 9. An annular damper 15 such as foam rubber compressively deformed if a water pressure therein exceeds a given value due to an earthquake or the like is provided in a space 14 defined by the anchoring members 2, 2' and the primary and secondary flexible water stoppers 10, 11. Consequently, it is possible to restrain an increase in water pressure, and prevent deformation and breakage of the members of the coupling.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underdrain joint for water supply / sewerage / communal ditches, underpasses, tunnels, burial boxes and the like.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Examined Patent Publication Sho 61-37515.
There is known an underdrain joint provided with a load bearing member as described in Japanese Patent Laid-Open Publication No. 2004-242242. As shown in FIG. 7, this joint is composed of a plurality of annular anchor members b, b'attached to the end faces of a pair of underdrain a, a'to be connected and arranged at intervals in the circumferential direction. The end portion of the load bearing member c is inserted and connected so as to be movable within a certain range and cannot be detached, and the two anchoring members are arranged outside the annular row of the plurality of load bearing members and are attached to each other. Short cylindrical inner and outer flexible water blocking members d and e are watertightly connected to the outer periphery of each load-bearing member and slightly shorter than the initial spacing of both anchoring members. The cylindrical body f is loosely fitted. This joint is supported by the anchoring members b and b'by loosely fitting the cylindrical body f on the outer periphery of the load bearing member c to prevent the flexible water blocking member d from sagging into the load bearing member c due to external water pressure. The load bearing member c can be formed to have the necessary minimum strength to improve the handleability of the load bearing member c and save the material.

Further, as disclosed in, for example, Japanese Patent Publication No. 2-22818, a pair of underdrain a, a'on the outer peripheral side of an anchor member b, b'attached to the end faces of a '. A water blocking member i made of incompressible rubber, synthetic resin or the like for primary water blocking is attached to the extended portions h and h ′, and an anchoring member b,
It is known that a flexible water blocking member j made of rubber, synthetic resin or the like for secondary water blocking is attached to the inner peripheral side of b '. As shown in FIG. 8, this joint is provided by abutting the short tubular bodies 1, 1'on the intermediate portion k of the flexible water blocking member j, and the abutting portions m, m'of the short tubular bodies 1, 1 '. And the anchoring members b and b ', the ends n and n'of the flexible waterproofing member are clamped, and the flexible waterproofing member j is anchored to the flexible waterproofing member j by tightening and fixing them with a shrimp vise 0, 0'. Member b,
This is intended to improve the waterproofness between b '.

[0004]

[Problems to be Solved by the Invention] Japanese Patent Publication No. 61-37
In the joint of the type described in Japanese Patent No. 515, a rubber member is provided on the outer side of the annular row of the tubular body f loosely fitted to the outer circumference of each load bearing member c
Flexible water blocking members d and e made of synthetic resin or the like on the inner and outer peripheral sides are arranged coaxially with the annular row of the tubular body f, but on the inner peripheral side between both anchoring members b and b '. It is conceivable that the space on the outer peripheral side of the flexible water blocking member d may be filled with water leakage over a long period of time.
In this case, the inner circumferential side flexible water blocking member d is held by the water pressure so as to lean against the cylindrical body f, and this state continues as long as the joint maintains the initial state of installation. In this way, an earthquake occurs when the space on the outer peripheral side of the flexible water blocking member d on the inner peripheral side between the anchor members b and b ′ is filled with water, and the two culverts a and a ′ approach each other. When it is displaced, there is no particular problem as long as water flows out through the gap of the skin plate g, one end of which is spot welded, to the outside, but the permeability of soil on the outer periphery of the joint is small, or the outer periphery of the joint has a concrete structure. If the water does not flow out of the joint because it is filled with something or the like, the water in the space between the anchoring members b and b'is compressed and the water pressure rises sharply to prevent water from flexing. Cylindrical body c through member d
Also, since the force resisting member f is pressed, there is a risk that the inner circumferential side flexible water blocking member d, the cylinder c, and the force resisting member f may be deformed or destroyed.

Also in the joint described in Japanese Patent Publication No. 2-22818, similarly, the space p between the primary water blocking member i and the secondary flexible water blocking member j is filled with water leakage for a long time. In this case, when the earthquake occurs, the water in the space p may be compressed and the primary water blocking member i and the secondary flexible water blocking member j may be destroyed.

Further, in the joint described in Japanese Patent Publication No. 61-37515, since a space Q exists between the flexible water blocking member e on the outer peripheral side and the skin plate g, this space Q is filled with water leakage. In that case, the water in the space Q may be compressed when the earthquake occurs, and the flexible water blocking member e may be destroyed.

The present invention has been made in order to solve the problems of the above-mentioned conventional joints of each underdrain, and is the outer peripheral side of the flexible water blocking member on the inner peripheral side or the outer peripheral side between both anchoring members. To provide an improved underdrain joint that can prevent deformation and damage of each member of the joint due to increase in water pressure when the joint undergoes sudden deformation due to an earthquake or the like in a state where the space is filled with water leakage. To do.

[0008]

The underdrain joint that achieves the above-mentioned object of the present invention is a primary stop provided on the outer peripheral side between annular anchor members attached to the end faces of a pair of underdrain to be connected. In a joint of an underdrain comprising a water member and a second tubular flexible water blocking member provided on the inner peripheral side between the anchor members, the primary water blocking member and the secondary flexible water blocking member And a cushioning material that is compressed and deformed when a water pressure equal to or higher than a preset value is received.

In one aspect of the present invention, underdrain joints for achieving the object of the present invention are provided on an outer peripheral side and an inner peripheral side between annular anchor members attached to end faces of a pair of underdrain to be connected. A skin having a primary flexible waterproof member and a secondary flexible waterproof member, and further extending over the outer peripheral surfaces of the ends of both the underdrain so as to cover the primary flexible waterproof member and the joints of the underdrain. In an underdrain joint having a space between the plate and a plate, a space between the primary flexible water blocking member and the skin plate is provided with a cushioning material that compressively deforms when a water pressure of a preset value or more is applied. It is characterized by.

[0010]

According to the present invention, the water pressure above the preset value is applied to the space between the primary water blocking member and the secondary flexible water blocking member or the space between the primary water blocking member and the skin plate. By providing a cushioning material that compresses and deforms when received, if this preset value is set to a value that exceeds the water pressure that the flexible water blocking member receives by the water filled in the space during normal times, both underdrain conduits will occur when an earthquake occurs. When the two are displaced in the direction of approaching each other, the water pressure rises to a value exceeding this preset value, and the cushioning material compresses and deforms to create a space for water to escape, so that load-bearing members, tubular bodies, flexible water blocking members, etc. It is possible to prevent an increase in water pressure that would otherwise cause deformation or breakage of the joint component.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 (a) is a cross-sectional view showing a normal state of one embodiment of the present invention, and FIG. 1 (b) is the same view when both underdrains connected by a joint are displaced in a direction approaching each other when an earthquake occurs. It is sectional drawing which shows the state of an Example.

The joint 1 of this embodiment has a structure similar to that of the conventional joint having a load bearing member shown in FIG. 7 (a circular one in which segments are assembled and secondary winding concrete is cast on the inner periphery thereof). In FIG. 1, only the main part is shown.

The joint 1 has anchoring members 2 and 2'fixed to opposite surfaces of a pair of underdrain (not shown), respectively. The anchor members 2, 2'are formed in a ring shape along the end face of the underdrain. Side wall 2 of this anchoring member 2, 2 '
a and 2a 'are holes 4 for inserting a load bearing member and for allowing the load bearing member to move within a certain range after the load bearing member is inserted,
4'is provided facing each other.

Reference numeral 5 is a proof member disposed between the side walls 2a and 2a 'of the anchor member. Although only one load bearing member 5 is shown in the figure, a plurality of load bearing members 5 are actually arranged along the side walls 2a and 2a 'of the anchor member in the circumferential direction at a regular pitch in a plurality of annular shapes. There is.

The load-bearing member 5 has a bar 7 having both ends inserted into the spaces 6 and 6'of the housing portions of the anchoring members 2 and 2'through holes 4 and 4 ', and a bar 7 of the bar 7, respectively. Screw part 7 at both ends
a, 7a ', screwed bolts 8, 8'and washers 8a, 8a'.

Further, the washers 8a and 8a 'have holes 4,
It is formed larger than 4'and prevents the bar 7 from coming out of the holes 4,4 '. In this way, both end portions of the load bearing member 5 are inserted into the spaces 6 and 6'and cannot be removed.

With the above construction, the proof member 5 connects the anchor members 2, 2'so that they can relatively approach and separate within a certain range.

The bar 7 of each load bearing member 5 has an inner diameter of 7
A cylindrical body 9 having a diameter larger than the diameter is loosely fitted. This cylinder 9
Is formed to be slightly shorter than the initial distance between the anchor members 2, 2 '. Each tubular body 9 forms an annular row together with each load bearing member 5.

At the outer peripheral position of the annular row of the cylindrical body 9, a primary cylinder (outer peripheral side) formed of rubber, synthetic resin or the like into a short cylindrical shape.
And secondary (inner peripheral) different diameter flexible water blocking members 10, 11
Are arranged coaxially with the annular row of cylinders 9. Both ends of the flexible water blocking members 10 and 11 of the cylindrical shape are extended portions 2b and 2b 'of the anchor members 2 and 2'and side walls 2a and 2a'.
And the anchoring members 2 and 2'are water-tightly connected to each other. Incidentally, 13 and 13 'are holding members for holding the secondary flexible water blocking member 11 in a predetermined shape. Further, 12 is a skin plate which is disposed over the outer peripheral surfaces of the anchor members 2, 2 ', one end of which is welded to one of the anchor members 2, 2', and the other end is It is point-welded to the other of the anchoring members 2 and 2 ', so that it can be easily peeled off when there is a ground change.

Side walls 2a, 2a 'and 1 of the anchor members 2, 2'
An annular cushioning material 15 is arranged in a space 14 formed by the next flexible water blocking member 10 and the secondary flexible water blocking member 11.

As the cushioning material 15, the amount of deformation is small with respect to the water pressure received by the water filled in the space 14 of the flexible water blocking members 10 and 11 at normal times, and when the water pressure is exceeded, the amount of deformation becomes sharp. A larger material is desirable because it increases the amount of compressive deformation during an earthquake. As a material satisfying such conditions, a foamed resin such as a medium styrofoam material shown in FIG. 6 shows the largest amount of compressive deformation with an increase in water pressure,
Next, there are rubbers with relatively low reaction forces such as foamed rubber and cushioning rubber, but once the foamed resin does not return to its original shape once it is compressed and deformed, it has the drawback that it cannot be used repeatedly. Is the most advantageous material because if the water pressure returns to normal after compressive deformation, it will return to its original state and can repeatedly perform compressive deformation when another earthquake occurs. Therefore, in this embodiment, foamed rubber is used as the cushioning material.

In any case, the flexible water blocking member 1 is normally used.
A preset value is set to a value that exceeds the water pressure received by 0 and 11 filled with water, and a material that causes compression deformation when the water pressure exceeds this value is selected as a cushioning material, even if the water pressure is less than this preset value. It is necessary to.

Next, the operation of this underdrain joint will be described. In normal times, even if the space 14 is filled with water leakage, the water pressure of this water is less than a preset value that causes the cushioning material 15 to undergo compressive deformation. The members 10, 11 are held in the position shown in FIG.

When an earthquake occurs and both culverts are displaced toward each other, the space 14 also narrows, so this space 14
The water filled inside is compressed and the water pressure rises above the preset value. Then, the cushioning material 15 is compressed and deformed as shown in FIG. 1 (b) to reduce the volume and create an escape area for the water that was about to be compressed, and prevent an excessive rise in water pressure. At this time, the air contained in the cushioning material 15 is compressed and stays in the cushioning material 15.

When the earthquake stops and both underdrains return to the original state, the flexible water blocking members 10 and 11 return to the state shown in FIG. 1 (a).
Further, since foamed rubber is used as the cushioning material 15, when the water pressure falls below the preset value, the cushioning material 15 once deformed by compression automatically returns to the original swelling state.

FIG. 2 shows another embodiment of the present invention.
FIG. 2A is a cross-sectional view showing a normal state, and FIG. 2B is a cross-sectional view showing a state similar to FIG. 1B when an earthquake occurs. In this embodiment and the embodiment described below, the same constituent elements as those in the embodiment of FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

In this embodiment, a bellows-shaped air bag 16 is used as a cushioning member arranged in the space 14, and a plurality of air bags 16 are arranged in an annular shape in the space 14. This air bag 16 is a space 14
The material is made of a material that retains an elongated shape as shown in FIG. 1 (a) below the preset value of the water filled therein and sharply reduces when the water pressure exceeds the preset value.

In this embodiment, the space 14
Is reduced as shown in FIG. 2 (b), the airbag 1
By compressing and deforming 6 to reduce the volume, an escape area for water is created, and an excessive rise in water pressure is prevented. At this time, the air in each air bag 16 stays in the air bag 16 in a compressed state.

FIG. 3 shows another embodiment of the present invention.
FIG. 3A is a sectional view showing a state under normal conditions, and FIG. 3B is a sectional view showing a state similar to FIG. 1B at the time of occurrence of an earthquake.

In this embodiment, two annular rubber tubes 17 are used as cushioning materials arranged in the space 14. These rubber tubes 17 are connected to an air pump (illustrated) via rubber tubes 18, and the rubber tubes 17 are always filled with air so that the rubber tubes 17 are not filled with air.
Retains its expanded shape, but when the water pressure of the water in the space 14 exceeds a preset value, the sensor installed in the air pump detects this water pressure and opens the air valve to remove the air in the rubber tube 17. It is designed to release rapidly to the outside.

Therefore, in this embodiment, when the space 14 is reduced as shown in FIG. 3 (b) at the time of an earthquake, the rubber tube 17 is compressed to have a flat shape and its volume is reduced, so that the escape area of water is prevented. create.

FIG. 4 is a sectional view showing another embodiment of the present invention in a normal state. The joint 20 of this embodiment has the same structure as the conventional joint shown in FIG. 8 as a whole.

The joint 20 is an anchoring member 22, 2 fixed to the mutually facing surfaces of a pair of underdrain 21, 21 ', respectively.
A short cylindrical primary water blocking member 23 made of incompressible rubber, synthetic resin or the like is disposed on the extended portions 22a, 22a 'on the outer peripheral side of 2'. Further, the secondary flexible water blocking member 2 made of flexible rubber, synthetic resin or the like is provided on the inner peripheral side of the anchoring members 22, 22 '.
4 are provided. The intermediate portion 2 of the flexible water blocking member 24
Short cylinders 25, 25 'are provided in contact with 4a, 24a', and contact plates 25a, 25 'of the short cylinders 25, 25' are provided.
The ends 24b and 24b 'of the flexible water blocking member 24 are sandwiched between a'and the side walls 22b and 22b' of the anchor members, and are clamped and fixed by the shrimp vise 26, 26 '. 27 is an underdrain
It is a joint seal material inserted in the joint between 1 and 21 '.

In this embodiment, the side walls 22b, 22b 'of the anchor members 22, 22' are similar to the embodiment shown in FIG.
An annular cushioning member 29 made of foam rubber having a low reaction force is disposed in a space 28 formed by the primary water blocking member 23 and the secondary flexible water blocking member 24. The function of this cushioning material 29 is the same as that of the cushioning material 15 of FIG.

FIG. 5 shows a problem at the time of an earthquake when the space between the primary flexible water blocking member 10 and the skin plate 12 is filled with water in the joint of the type including the proof member 5 shown in FIGS. FIG. 5A shows an example of the space 14
5 is a cross-sectional view showing a normal state when there is no water in FIG.
FIG. 1B is a sectional view showing a state similar to that of FIG.

In this embodiment, a space 30 formed between the primary flexible water blocking member 10 and the skin plate 12.
As in the embodiment shown in FIG. 1, an annular cushioning material 31 made of foamed rubber is provided therein.

In this embodiment, the space 30
As shown in FIG. 5 (b), when the contraction water pressure exceeds the preset value, the cushioning material 31 is compressed and deformed to reduce the water pressure to create an escape area for preventing the water pressure from excessively increasing.

In the present invention, the load bearing member 5 of the type in which the cylindrical body 9 is loosely fitted in the bar 7 as shown in FIGS. 1 to 3 and FIG.
Not only the joints that use a bar, but also the underdrain joints that use a load-bearing member that uses a bar but does not loosely fit the cylinder, and other spaces between the primary waterproofing member and the secondary flexible waterproofing member. It can be widely applied to the underdrain joints of the structure where water leakage may fill up.

The present invention also includes the segments of the above embodiment and
The present invention can be applied not only to the underdrain made of the second winding concrete but also to the underdrain made of other materials. The shape of the underdrain may be circular, elliptical, quadrangular or polygonal.

[0040]

As described above, according to the present invention, 1
Space between the secondary water blocking member and the secondary flexible water blocking member, or 1
By providing a cushioning material that compressively deforms when a water pressure equal to or greater than a preset value is applied in the space between the next flexible water blocking member and the skin plate, the preset water blocking member can be used to keep the preset value in the space. If you set a value that exceeds the water pressure received by the water that fills up with the water, the water pressure rises to a value that exceeds this preset value when the underdrain is displaced in the direction of approaching each other in the event of an earthquake, and the cushioning material compresses To create a space for water to escape,
It is possible to prevent an increase in water pressure that causes deformation or destruction of the joint constituent elements such as the load bearing member, the cylindrical body, and the flexible water blocking member.

[Brief description of drawings]

1 is a sectional view showing an embodiment of the present invention, FIG.
Shows the normal state, and Fig. 1 (b) shows the state when an earthquake occurs.

FIG. 2 is a sectional view showing another embodiment of the present invention.
2A shows a normal state, and FIG. 2B shows a state when an earthquake occurs.

FIG. 3 is a sectional view showing another embodiment of the present invention.
FIG. 3A shows a normal state, and FIG. 3B shows a state when an earthquake occurs.

FIG. 4 is a sectional view showing another embodiment of the present invention.

5 is a cross-sectional view showing still another embodiment of the present invention, FIG. 5 (a) is a normal view when there is no water in the space 14, FIG.
(B) is a figure which shows the state at the time of an earthquake.

FIG. 6 is a graph showing compression characteristics of a buffer material.

FIG. 7 is a cross-sectional view showing an example of a conventional underdrain joint.

FIG. 8 is a cross-sectional view showing another example of a conventional underdrain joint.

[Explanation of symbols]

 1, 20 Joint 2, 22 Anchoring member 10, 23 Primary water blocking member 11, 24 Secondary flexible water blocking member 15, 16, 17, 29, 31 Buffer material

Claims (2)

[Claims] 1. A primary water blocking member provided on an outer peripheral side between annular anchor members attached to end faces of a pair of underdrain to be connected, and a short member provided on an inner peripheral side between the anchor members. In an underdrain joint provided with a tubular secondary flexible water blocking member, when it receives a water pressure of a preset value or more between the primary water blocking member and the secondary flexible water blocking member, it is compressed and deformed. An underdrain joint characterized by having a cushioning material. 2. An outer peripheral side and an inner peripheral side provided between annular anchor members attached to the end faces of a pair of underdrain to be connected.
A skin plate provided with a second flexible water blocking member and a second flexible water blocking member, and further extending over the outer peripheral surfaces of the end portions of both the underdrain so as to cover the primary flexible water blocking member and the joints of the underdrain. In an underdrain joint having a space between the first and second flexible water blocking members, a cushioning material that compressively deforms when receiving a water pressure equal to or higher than a preset value is provided in the space between the primary flexible water blocking member and the skin plate. An underdrain joint.