JPH086861B2 - Underdrain fittings - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint for a culvert such as a water supply system, a sewer system, a common ditch, an underpass, a tunnel, and a submerged box.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Examined Patent Publication No. 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. 5, this joint is composed of a plurality of annular anchor members b, b'which are attached to the end faces of a pair of underdrain a, a'to be connected and which are 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 anchor members b and b'by preventing the flexible water blocking member d from sagging into the load bearing member c due to external water pressure by loosely fitting the cylindrical body f around the load bearing member c. 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.

[0003]

In this type of joint, the inner peripheral side and the outer peripheral side made of rubber, synthetic resin or the like are formed on the outer side of the annular row of the cylindrical body f loosely fitted to the outer periphery of each load bearing member c. Although the flexible water blocking members d and e are arranged coaxially with the annular row of the tubular body f, the flexible water blocking members d and e are long in the outer space of the inner circumferential flexible water blocking member d between the anchoring members b and b ′. It is conceivable that the leak will fill during the year. In this case, the inner circumferential side flexible water blocking member d is held by the water pressure so as to lean on the tubular 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, or the like. If the water does not flow out of the joint because it is filled with things, the water in the space between the anchoring members b and b'is compressed and the water pressure rises sharply, causing the inner side flexible water stop. Since the cylinder body c and the load bearing member f are pressed through the member d,
The flexible water blocking member d on the inner peripheral side, the cylindrical body c, and the proof member f
May be deformed or destroyed.

The present invention has been made in order to solve the problem of the above-mentioned conventional underdrain joint using the load-bearing member, and is intended to solve the problem of the flexible water-stop member on the inner peripheral side between both anchor members. Providing an improved underdrain joint that can prevent deformation and damage to each member of the joint due to rise in water pressure when the joint undergoes a sudden deformation due to an earthquake etc. when the space on the outer peripheral side is filled with water leakage Is what you are trying to do.

[0005]

SUMMARY OF THE INVENTION The underdrain joint for achieving the above object of the present invention is arranged circumferentially with a pair of annular anchor members attached to the end faces of a pair of underdrain to be connected. The end portions of the plurality of load-bearing members are inserted and connected so as to be movable within a certain range and cannot be removed, and the two anchoring members are arranged outside the annular row of the load-bearing members. Watertightly connected by flexible water blocking members on the inner and outer sides of a short cylinder whose ends are fixed to both anchoring members, and from the initial spacing of both anchoring members on the outer periphery of each load-bearing member. In an underdrain joint in which a slightly shorter tubular body is loosely fitted, a cushioning material is provided between the tubular body and the flexible water blocking member on the inner peripheral side, the cushioning material being compressed and deformed when a hydraulic pressure of a preset value or more is applied. It is characterized by.

The present invention can also be applied to an underdrain joint of a type that uses a load-bearing member but does not loosely fit the cylindrical body on its outer periphery. In this case, the underdrain joint that achieves the above-mentioned object of the present invention comprises a plurality of load-bearing members circumferentially arranged on a pair of annular anchor members attached to the end faces of a pair of underdrain to be connected. The ends of the anchoring members are inserted and connected so as to be movable within a certain range and cannot be removed, and the two anchoring members are arranged outside the annular row of the plurality of load-bearing members and the ends of the anchoring members are connected to each other. In the joint of the underdrain watertightly connected by the flexible water blocking members on the inner and outer peripheral sides of the fixed short tubular shape, a preset value or more is set between the yield strength member and the flexible water blocking member. It is characterized in that a cushioning material that is compressed and deformed when receiving water pressure is provided.

In one aspect of the present invention, the cushioning material is flexible from the cylinder body or the bearing member of the cushioning material accommodating cylinder arranged so as to surround the cylinder body or the bearing member. It is filled in the internal space on the side of the water blocking member, and the cushioning material storage cylinder is formed such that the distance between the inner walls thereof is slightly larger than the outer diameter of the cylindrical body or the proof member. It is what

[0008]

According to the present invention, the cushioning member is compressed and deformed when a hydraulic pressure of a preset value or more is applied between the cylindrical body or the strength member that is loosely fitted around the strength member and the flexible water blocking member on the inner circumference side. By installing the material, if this preset value is set to a value that exceeds the water pressure received by the water filling the space between the anchoring members in the inner circumference side flexible waterproofing member during normal times, both underdrain conduits at the time of an earthquake occur. 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.

Further, the cushioning material is filled from the cylinder body or the strength member of the cushioning material storage cylinder arranged so as to surround the cylinder body or the strength member to the inner circumferential side flexible water blocking member side, and the inner wall of the storage cylinder. By forming the distance between them to be slightly larger than the outer diameter of the tubular body or the load bearing member, the storage barrel is attached to the outer peripheral surface of the tubular body or the load bearing member in accordance with the compressive deformation of the cushioning material and the original state restoring operation. Although it is possible to slide along the radial direction of the joint, it is possible to prevent the cushioning material from dropping into the space inside the storage cylinder on the side opposite to the cylinder body or the proof member.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a cross-sectional view showing a normal state of an embodiment of the present invention, and FIG. 2 shows a state of the same embodiment when both underdrains connected by a joint are displaced toward each other when an earthquake occurs. 4 is a cross-sectional view, FIG. 3 is a view showing two cylindrical bodies and a load-bearing member which are adjacent to each other in the AA line arrow view in FIG.
[Fig. 4] is a graph showing compression characteristics of various materials that can be used as a cushioning material.

The joint 1 of this embodiment has a structure similar to that of the conventional underdrain joint shown in FIG. 5 as a whole (a circular one in which segments are assembled and secondary winding concrete is placed on the inner periphery thereof). In FIG. 1 and FIG. 2, only the main part is shown.

The joint 1 has anchoring members 2 and 2'which are respectively fixed to opposite surfaces of a pair of underdrain (not shown). The anchoring members 2, 2 'are formed in an annular shape along the end surface of the culvert. Side wall 2 of this anchoring member 2, 2 '
a, 2a ', holes 4 for inserting the 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 drawing, a plurality of the same load-bearing members 5 are actually arranged annularly at equal pitches in the circumferential direction along the side walls 2a, 2a 'of the anchoring member. I have.

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 ', bolts 8, 8' screwed and washers 8a, 8a '.

Further, the washers 8a and 8a 'have holes 4,
It is formed larger than 4 'to prevent 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 the bar 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, flexible water blocking members 10 and 11 having different diameters on the outer peripheral side and the inner peripheral side, which are formed in a short cylindrical shape from rubber, synthetic resin or the like, are arranged in the cylindrical shape. It is arranged coaxially with the annular row of bodies 9. Both ends of the tubular flexible water blocking members 10 and 11 are attached to the extended portions 2b and 2b 'and the side walls 2a and 2a' of the anchor members 2 and 2 ', respectively. 2'is watertightly connected. In addition, 13 and 13 'are holding members for holding the inner circumferential flexible water blocking member 11 in a predetermined shape. Further, 12 is a skin plate which is arranged 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 spot-welded to the other of the anchor members 2, 2 ', and is configured to be easily peeled off when there is a ground change.

Between each of the cylinders 9 and the inner peripheral surface of the flexible water blocking member 11 on the inner peripheral side, a rectangular tube-shaped cushioning material accommodating cylinder 14 is arranged so as to surround the cylinders 9. . A cushioning material 15 is filled in the internal space from the tubular body 9 inside the storage cylinder 14 to the inner circumferential side flexible water blocking member 11 side. As shown in FIG. 3, the storage cylinder 14 is formed such that the distance between the inner walls thereof is slightly larger than the outer diameter of the cylindrical body 9, and therefore the storage cylinder 14 is formed.
Can slide in the radial direction of the joint along the outer peripheral surface of the tubular body 9 following the compressive deformation of the cushioning material 15 and the return to the original state. It does not fall into or protrude into the internal space of the side storage cylinder.

As the cushioning material 15, the deformation amount with respect to the water pressure received by the water filled in the space between the side walls 2a and 2a 'of the anchoring members 2 and 2'in the inner circumferential side flexible water blocking member 11 in a normal state. It is desirable to use a material that has a small amount of deformation, and in which the amount of deformation increases rapidly when the water pressure is exceeded, in order to increase the amount of compressive deformation during an earthquake. As a material satisfying such conditions, the foamed resin such as the medium expanded polystyrene shown in FIG. 4 shows the largest amount of compressive deformation with respect to the increase of the water pressure, and then the reaction force such as the foamed rubber and the buffer rubber is relatively large. Although rubber with a low shape can be mentioned, foamed resin does not return to the original state once it is compressed and deformed, so there is a problem that it cannot be used repeatedly and repeatedly.This point rubber returns to the original state when the water pressure returns to normal after compression deformation. This is the most advantageous material because the compressive deformation operation can be repeated when an earthquake occurs again. Therefore, in this embodiment, foamed rubber is used as a cushioning material.
With respect to the size of the cushioning material storage cylinder 14 in the shape of a rectangular tube, the type of the cushioning material filled therein, the filling amount, etc., the water generated by the compressive deformation of the cushioning material escapes when the water pressure rises when an expected earthquake occurs. It may be calculated from the required size of the space and set appropriately.

In any case, a preset value is set to a value that exceeds the water pressure received by the water filled in the inner circumferential side flexible water blocking member 11 in normal times, and if the water pressure is less than this preset value, the water pressure is hardly deformed. It is necessary to select, as the cushioning material, a material that causes compressive deformation when exceeds this value.

An annular space member 16 made of expanded polystyrene is inserted in the gap between the pair of anchor members 2 and 2'as a space securing and cushioning member.

Next, the operation of the joint of the culvert will be described. In normal times, the side walls 2a of the anchor members 2, 2 ',
Even if the outer peripheral side space of the inner peripheral side flexible water blocking member 11 between 2a ′ is filled with water leakage, the water pressure of this water is less than a preset value at which the buffer material 15 in the buffer material storage cylinder 14 causes compressive deformation. Therefore, the cushioning material 15 is not deformed, and the inner flexible water blocking member 11 is supported on the cushioning material storage cylinder 14 as shown in FIG.

When an earthquake occurs and both underdrains are displaced toward each other, the side walls 2a, 2a 'of the anchor members 2, 2'.
Since the space on the outer peripheral side of the flexible water blocking member 11 on the inner peripheral side also narrows, the water filled in this space is compressed and the water pressure rises above a preset value. Then, the cushioning material 15 filled in the cushioning material storage cylinder 14 is compressed and deformed as shown in FIGS. 2 and 3, and the cushioning material storage cylinder 14 is compressed by moving to the position shown by the dotted line in FIGS. 2 and 3. Create an escape area for the water that is about to be destroyed, and prevent an excessive rise in water pressure. At this time, the air contained in the cushioning material escapes into the joint from both sides of the cushioning material storage cylinder 14.

At this time, the amount of water that can be absorbed per one pitch P (FIG. 3) of the tubular body 9 is P × H (the amount of lowering of the inner peripheral side flexible water blocking member 11).

When the earthquake stops and both underdrains return to their original state, the inner circumferential flexible water blocking member 11 returns to the position shown by the solid line in FIGS. 1 and 3. In this embodiment, since foamed rubber is used as the cushioning material 15, the cushioning material 15 once compressed and deformed.
Automatically returns to its original bulge. Along with this, the cushioning material storage cylinder 14 also moves upward in the drawings and returns to the position shown by the solid line in FIGS. 1 and 3.

[0027]

[Modification] The cushioning material is not limited to that of the above-mentioned embodiment. For example, a plurality of annular rubber tubes are filled with air so that the space between the cylinder body 9 and the inner circumferential side flexible water blocking member 11 is reduced. It is possible to make various modifications such as interposing them in parallel with each other, or filling a hollow ring with a cushioning material such as foamed rubber and interposing it between the cylindrical body 9 and the inner circumferential side flexible water blocking member 11. . However, such a ring-shaped cushioning material is difficult to mount, and there are various problems such as the possibility that it may not be able to return to its original position if the position shifts when an earthquake occurs. Example 1
Since the shock-absorbing material storage cylinder 14 is attached to the single cylinder body 9, the construction is easy, and when the earthquake stops, the shock-absorbing material can be reliably restored to its original state, so that the shock-absorbing material functions repeatedly. This is the most desirable embodiment.

The present invention is not limited to the type of joint having the bearing member 5 in which the cylindrical body 9 is loosely fitted in the bar 7 as in the above embodiment, but the type in which the bar 7 is used but the cylindrical body 9 is not loosely fitted. It can also be applied to an underdrain joint using a load bearing member.

The present invention can be applied not only to the underdrain made of the segment and the secondary rolled concrete of the above-mentioned embodiment but also to the underdrain made of other materials. The shape of the culvert may be any of a circle, an ellipse, a square, and a polygon. Cylinder 9
The cross section is not limited to a circular shape, but may be a quadrangular shape or other shapes.

Further, the cushioning material accommodating cylinder 14 is not limited to the quadrangular cylinder as in the above-mentioned embodiment, but other shapes such as a polygonal cylinder can be used. Further, one side of the storage cylinder may be closed. A storage cylinder whose both sides are closed can also be used, but this is disadvantageous because the air inside the cylinder is compressed when the cushioning material is compressed, resulting in increased air resistance and impeding the compression of the cushioning material.

[0031]

As described above, according to the present invention, a water pressure of a preset value or more is provided between the cylindrical body or the strength member loosely fitted to the outer circumference of the strength member and the flexible water blocking member on the inner circumference side. By providing a cushioning material that compresses and deforms when receiving water, this preset value is set to a value that exceeds the water pressure received by the water filled in the space between the anchoring members by the flexible water stop member on the inner peripheral side during normal times. In the case of an earthquake, when both culverts are displaced toward each other in the event of an earthquake, the water pressure rises above this preset value, and the cushioning material compresses and deforms 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 body and the flexible water blocking member.

Further, the cushioning material is filled on the upper side of the cylinder body or the strength member of the cushioning material storage cylinder arranged so as to surround the cylinder body or the strength member, and the distance between the inner walls of the storage cylinder is adjusted to the cylinder body or the strength member. By forming the storage cylinder so as to be slightly larger than the outer diameter of the member, the storage cylinder slides in the radial direction of the joint along the outer peripheral surface of the cylindrical body or the load-bearing member following the compressive deformation of the cushioning material and the restoring operation to the original state. Although it can move, it is possible to prevent the cushioning material from dropping into the space inside the storage cylinder on the opposite side of the cylinder.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a normal state of an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state of the same embodiment when both underdrains connected by a joint are displaced toward each other when an earthquake occurs.

FIG. 3 is a view taken along the line AA in FIG.

FIG. 4 is a graph showing compression characteristics of a cushioning material.

FIG. 5 is a cross-sectional view showing a conventional underdrain joint.

[Explanation of reference numerals] 1 joint 2 anchoring member 5 proof member 9 cylindrical body 10 outer peripheral flexible water blocking member 11 inner peripheral flexible water blocking member 14 cushioning material storage cylinder 15 cushioning material

Claims (4)

[Claims] 1. The end portions of a plurality of load-bearing members arranged at intervals in the circumferential direction on a pair of annular anchor members attached to the end faces of a pair of underdrain to be connected can be moved within a certain range. In addition, a short cylindrical inner circumference is inserted and connected so as not to come off, and the two anchor members are arranged outside the annular row of the plurality of load bearing members, and the ends are fixed to the anchor members. Side and outer peripheral side watertight connection with a flexible watertight member, in the underdrain joint in which a cylinder slightly shorter than the initial interval of the both anchor members is loosely fitted to the outer periphery of each of the load-bearing members, in the cylinder A joint for an underdrain, characterized in that a cushioning material is provided between the flexible water blocking member on the inner peripheral side and which compressively deforms when a water pressure of a preset value or more is applied. 2. The end portions of a plurality of load-bearing members arranged at intervals in the circumferential direction on a pair of annular anchor members attached to the end faces of a pair of underdrain to be connected can be moved within a certain range. In addition, a short cylindrical inner circumference is inserted and connected so as not to come off, and the two anchor members are arranged outside the annular row of the plurality of load bearing members, and the ends are fixed to the anchor members. In an underdrain joint watertightly connected by flexible water stop members on the side and the outer circumference, compression is performed when a water pressure of a preset value or more is applied between the load-bearing member and the flexible water stop member on the inner circumference side. An underdrain joint characterized by having a cushioning material that deforms. 3. The cushioning material is filled from the cylinder body of the cushioning material storage cylinder arranged so as to surround the cylinder body to the inner space on the inner circumferential side flexible water blocking member side, The underdrain joint according to claim 1, wherein the cushioning material storage cylinder is formed such that a distance between inner walls thereof is slightly larger than an outer diameter of the cylinder body. 4. The cushioning material is filled in the inner space of the cushioning material storage cylinder arranged so as to surround the bearing member from the bearing member to the inner circumferential side flexible water blocking member side, The underdrain joint according to claim 2, wherein the cushioning material storage cylinder is formed such that a distance between inner walls thereof is slightly larger than an outer diameter of the load bearing member.