JPH0823167B2 - 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. 4, 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 distance between 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. In an underdrain joint watertightly connected by flexible water-stop members on the inner and outer sides of a short cylinder whose ends are fixed to both anchor members, in the joint of the anchor members on the outer periphery of the load-bearing member. A cylindrical inner sleeve that is slightly shorter than the initial distance is loosely fitted, and a cylindrical outer sleeve that is slightly shorter than the initial distance between the anchoring members is loosely fitted to the outer circumference of the inner sleeve and the inner sleeve and the outer sleeve. Around the entire circumference, a cushioning material that compressively deforms when subjected to a water pressure above the planned value Wherein the or filled.

[0006]

According to the present invention, the space between the cylindrical inner sleeve and the outer sleeve is filled with the cushioning material which is compressed and deformed when it receives a water pressure equal to or more than the preset value.
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 will approach each other in the event of an earthquake. When displaced, the water pressure rises above this preset value, and the cushioning material compresses and deforms to create a space for water to escape, so it is possible to prevent deformation and destruction of joint components such as load bearing members and flexible water blocking members. It is possible to prevent the rise of water pressure.

Particularly, in the present invention, since the cushioning material is filled in the space between the cylindrical inner sleeve and the outer sleeve over the entire circumference, the direction of the force received by the sleeve is not limited, and the force can be applied from any direction. Even when receiving the shock, the cushioning material can perform the intended compressive deformation. Further, since the cushioning material may be filled in the space between the inner and outer sleeves over the entire circumference, the work is easier and the workability is better than the case where the cushioning material is filled only in the space on the flexible water blocking member side.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a view showing a main part of one embodiment of the present invention, a view taken along the line AA in FIG. 2, FIG. 2 is a cross-sectional view showing a normal state, and FIG. 3 is connected by a joint when an earthquake occurs. It is sectional drawing which shows the state of the same Example when both the underwater culverts which have moved are displaced in the direction which approaches mutually.

The joint 1 of this embodiment has a structure similar to that of the conventional underdrain joint shown in FIG. 4 as a whole (a circular one in which segments are assembled and secondary winding concrete is placed on the inner periphery thereof). 2 and FIG. 3, 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 walls 2 of the anchoring members 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 'are formed 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 manner, both ends of the load-bearing member 5 are undetachably inserted into the spaces 6, 6 '.

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

At the outer peripheral position of the annular row of the load bearing members 5,
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 tubular shape from rubber, synthetic resin, or the like, are arranged coaxially with the annular row. These cylindrical flexible water blocking members 10, 1
1 has extended portions 2b and 2b of the anchor members 2 and 2'at both ends thereof.
They are attached to b'and side walls 2a, 2a ', respectively, and water-tightly connect the anchoring members 2, 2'. 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.

A cylindrical inner sleeve 9 which is slightly shorter than the initial distance between the two anchoring members 2, 2'is loosely fitted on the outer periphery of the bar 7 of the proof member 5, and further the outer anchors 2, 2 ' The outer sleeve 17 having a cylindrical shape slightly shorter than the initial interval is loosely fitted, and the cushioning material 18 is filled in the tubular space between the inner sleeve 9 and the outer sleeve 17 over the entire circumference.

As the cushioning material 18, 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 materials satisfying such conditions, foamed resins such as styrofoam show the largest amount of compressive deformation in response to an increase in water pressure, and then there are materials of relatively low reaction force such as foamed rubber and buffer rubber. However, once the foamed resin has been compressed and deformed, it does not return to its original state, so there is a problem that it cannot be used repeatedly and repeatedly.This point rubber returns to its original state when the water pressure returns to normal after compression deformation, and an earthquake occurs again. It is the most advantageous material because it can be repeatedly compressed and deformed at times.

In this embodiment, rubber or foamed rubber is used as the cushioning material, and a large number of cavities 18a are formed over the entire circumference as shown in FIG. 1 in order to increase the amount of displacement during compression deformation. The type of cushioning material, the shape of the cavity, the filling amount, etc. may be calculated from the required size of the space where the water created by the compressive deformation of the cushioning material escapes when the expected water pressure rises and may be set appropriately. .

In any case, a preset value is set to a value exceeding the water pressure received by the water filled in the inner circumferential side flexible water blocking member 11 at normal times, and the water pressure below this preset value causes almost no deformation, 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 this underdrain joint will be described. In normal times, the side walls 2a of the anchor members 2, 2 ',
Even if the space on the outer peripheral side of the flexible water blocking member 11 on the inner peripheral side between 2a 'is filled with water leakage, the water pressure of this water is less than a preset value at which the cushioning material 18 between the sleeves 9 and 17 causes compressive deformation. Therefore, the cushioning member 18 is not deformed, and the inner circumferential flexible water blocking member 11 is supported on the outer sleeve 17 as shown in FIG.

When an earthquake occurs and the two underdrains are displaced toward each other, the side walls 2a, 2a 'of the anchor members 2, 2'are.
Since the space on the outer peripheral side of the flexible water blocking member 11 on the inner peripheral side also intervenes, the water filled in this space is compressed and the water pressure rises to a preset value or more. Then, the cushioning material 18 filled between the sleeves 9 and 17 is compressed and deformed as shown in FIG. 3 to form an escape area for the water that is about to be compressed, and prevents an excessive increase in water pressure. At this time, the air contained in the cushioning material escapes into the joint from both sides of the sleeves 9 and 17.

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 in FIG. In this embodiment, since rubber or foamed rubber is used as the cushioning material 18, the cushioning material 18 once compressed and deformed automatically returns to the original swelling state. Along with this, the sleeve 9,
17 also moves upward in the figure and returns to the position shown in FIG.

Further, the present invention is not limited to the above-mentioned embodiment, but as shown in FIG.
Further, the inner sleeve 9 and the outer sleeve 17 provided with the cushioning material 18 of FIG. 1 may be loosely fitted.

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.

[0026]

As described above, according to the present invention, in the space between the cylindrical inner sleeve and the outer sleeve,
Since the cushioning material that compressively deforms when it receives a water pressure above the preset value is filled over the entire circumference, this preset value is normally set by the water filled in the space between the anchor members by the inner circumferential side flexible water blocking member. If you set a value that exceeds the received water pressure, when both culverts are displaced in the direction of approaching each other in the event of an earthquake, the water pressure will rise to a value exceeding this preset value, the buffer will compress and deform, and the water will escape. Since the space is created, 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 and the flexible water blocking member.

Particularly, in the present invention, since the cushioning material is filled in the space between the cylindrical inner sleeve and the outer sleeve over the entire circumference, the direction of the force received by the sleeve is not limited, and the force can be applied from any direction. Even when receiving the shock, the cushioning material can perform the intended compressive deformation. Further, since the cushioning material may be filled in the space between the inner and outer sleeves over the entire circumference, the work is easier and the workability is better than the case where the cushioning material is filled only in the space on the flexible water blocking member side. Have advantages.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a main part of one embodiment of the present invention and is a view taken along the line AA in FIG.

FIG. 2 is a cross-sectional view showing a normal state of an embodiment of the present invention.

FIG. 3 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. 4 is a sectional view showing a joint of a conventional underdrain.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joint 2 Anchoring member 5 Proofing member 9 Inner sleeve 10 Outer peripheral flexible water blocking member 11 Inner peripheral flexible water blocking member 17 Outer sleeve 18 Buffer material

Claims (1)

[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. In an underdrain joint watertightly connected by flexible water stop members on the outer and outer sides, a cylindrical inner sleeve, which is slightly shorter than the initial distance between the anchor members, is loosely fitted to the outer circumference of the load-bearing member. A cushioning material in which a cylindrical outer sleeve, which is slightly shorter than the initial distance between the anchoring members, is loosely fitted to the outer periphery, and which is compressed and deformed in the space between the inner sleeve and the outer sleeve when a water pressure higher than a predetermined value is applied. An underdrain joint characterized by being filled over the entire circumference.