JPH07317089A - Joint for underground structure - Google Patents

Abstract

PURPOSE:To obtain a joint for an underground structure capable of resisting large groundwater pressure and earth pressure in high depth by comparatively small-sized and simple structure and capable of corresponding to large displacement in all directions and having excellent corrosion resistance and abounding in durability. CONSTITUTION:The bent section of a bearing element 90 is placed and inserted into a bearing pipe in the bearing pipe under the state, in which bearing bars are bent in a turn or at a plurality of times, and the bearing element 90 is constituted between an outer-circumferential flexible cut-off member 6 and an inner-circumferential flexible cut-off member 7 fixed while being cossed at the end sections of culverts 1, 1'. The bearing element 90 is placed in a space 8 formed between both flexible cut-off members 6, 7, and a bearing mechanism 9, in which anchoring sections 93 are mounted at both end sections of the bearing bars projected from both-end opening sections of the bearing pipe of the bearing element 90, is fixed at both culvert end sections through the anchoring sections 93.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of joints for structures constructed underground such as water and sewage systems, subways, common ditches, tunnels, underpasses, underground malls and various underground tunnels.

[0002]

2. Description of the Related Art In conventional joints for underwater conduits such as water and sewers, subways, common ditches, and caverns, tubular frame bodies are attached to opposite ends of a pair of cylindrical underdrain pipes facing each other. , Both ends of a flexible water blocking member formed in the shape of a short cylinder from an elastic body such as rubber or synthetic resin are watertightly attached to the inner peripheral surface of the frame body to form a culvert due to uneven settlement of the ground. There is a type that absorbs the relative displacement and stops the water between these culverts. As an example, the joint described in Japanese Patent Publication No. 63-58982 proposed by the applicant of the present invention, as shown in the cross-sectional view of FIG. 24, has an inner circumference of the end portions of a pair of opposed underdrains a and a ′. It is formed in the shape of a short cylinder made of an elastic material such as rubber or synthetic resin and straddles the stepped portions b and b ′ formed on the surface, and has an annular constricted portion c bulging toward the inner peripheral side at the center. Further, a flexible water blocking member e having anchoring flange portions d and d ′ extending from both sides of the constricted portion c is fixed at the anchoring flange portions d and d ′, and the step portions b and b ′ and the flexible portion. In the space formed between the flexible water blocking member e and the flexible water blocking member e, protective members f and f'for preventing the flexible water blocking member e from bulging and deforming in the axial direction are arranged. In addition, g, g '
Is a frame body having flanges h, h ', j, j', and end surface portions i, i ', and k is a joint material.

As another type of underdrain joint, for example, Japanese Patent Publication No. 61-37515 proposed by the present applicant.
There is known an underdrain joint provided with a load bearing member as described in Japanese Patent Laid-Open Publication No. 2004-242242. This joint, as shown in FIG.
The end portions of a plurality of load-bearing members p arranged at intervals in the circumferential direction in a pair of annular anchoring boxes m, m ′ attached to the end faces of a pair of underdrain a, a ′ to be connected are within a certain range. Is inserted and connected so as not to come off, and the both anchoring boxes are arranged outside the annular row of the plurality of load-bearing members, and end portions are formed on the side walls n and n'of both anchoring boxes. A cylindrical body t which is watertightly connected by each fixed short tubular flexible water blocking member Q and is slightly shorter than the initial distance between the side walls / n, n'of both anchoring boxes on the outer periphery of each load bearing member.
It is a loose fit. This joint is supported by the anchoring boxes m and m'by loosely fitting the cylindrical body t around the outer periphery of the load bearing member p to prevent the flexible water blocking member Q from sagging into the load bearing member p due to external water pressure. It is intended that the load-bearing member p is formed to have the minimum necessary strength to improve the handleability of the load-bearing member p and save the material.

[0004]

In recent years, various new technologies have been developed and put into practical use for the construction of deep underground structures against the backdrop of increasing social demands for advanced utilization of underground spaces. Deep drilling, which was not possible with the construction method, is now possible due to the generalization of the underground continuous wall construction method, etc.
The technological progress of the shield construction method has enabled the construction of large-depth and large-diameter tunnels, and large-scale projects are underway nationwide using the new technology. As the size and depth of underground structures are rapidly increasing in this way, suitable performance is required for joints that are essential for ensuring the safety of structures.

However, the joint (FIG. 24) described in Japanese Patent Publication No. 63-58982 has a structure of 1 kg / cm.
It can withstand outside water pressure of about ^2, but depth is 20m.
It is not possible to cope with the large earth pressure of about 3 kg / cm ² that the joint receives at the high depth. Also, this joint can handle shear displacement up to about 30 cm, but with respect to extensional displacement, when extensional displacement occurs and earth and sand enter the open joint, it expands to the inner peripheral side. Constricted part c of water blocking member
The space s is clogged with earth and sand, and this earth and sand makes extension of the flexible water blocking member e substantially impossible. Therefore, the allowable extensional displacement of the flexible water blocking member e is limited to about 20 mm,
Therefore, the allowable elongation displacement of the joint is suppressed to this extremely small amount. This amount is equivalent to the expansion and contraction joint width that is generally provided for civil engineering and construction, and it is difficult to absorb the elongation displacement caused by large ground movement due to uneven settlement of the ground or earthquake.

Further, since the joint described in Japanese Patent Publication No. 61-37515 (FIG. 25) has a structure having a proof member, it can sufficiently cope with a large earth pressure exceeding 3 kg / cm ² at a high depth of 20 m or more. Although it is possible to cope with the large elongation displacement caused by the ground movement due to an earthquake, etc., the structure is complicated and the joints m and m'are required. However, there is a problem in that it becomes large in size, it takes a lot of time to install it, and the manufacturing cost becomes high. Further, when a metal bearing member is used inside a high humidity underdrain, the bearing member is apt to corrode and the life of the bearing member is shortened.

The present invention has been made in order to solve the problems of the above-mentioned conventional joints when dealing with the sophistication of the joint performances due to the increase in depth of underground structures. Despite its simple structure, it can withstand large earth pressure at high depths, can cope with large elongation displacement caused by ground changes due to earthquakes, etc., and has an improved underdrain joint with excellent corrosion resistance and high durability. Is to provide.

[0008]

A joint for an underground structure of the present invention that achieves the above-mentioned object extends over a step portion formed on each of the inner peripheral surfaces of the end portions of a pair of opposed underground structures. An outer peripheral flexible waterproof member having a short cylindrical shape made of an elastic material such as rubber or synthetic resin and having an annular concave portion formed on the inner periphery thereof and anchoring flange portions on both sides of the concave portion; An inner circumferential flexible water blocking member formed in a short tubular shape made of an elastic material such as synthetic resin and having an annular concave portion formed on the outer periphery thereof and anchoring flange portions on both sides of the concave portion, respectively. While fixed at each anchoring flange portion, the elongated proof bending member is inserted into a bending position regulating hollow member of a predetermined length in a state where it is bent once or plural times in the longitudinal direction, and the bending position regulation of the proof bending member is performed. Outside the end of the hollow member A space where the bending position regulating hollow member is formed by an annular recess of the outer peripheral flexible water blocking member and an annular recess of the inner peripheral flexible water blocking member. It is characterized in that it is fixed to the step portion through the anchor portion so as to be located inside.

According to the above structure, the outer peripheral flexible water blocking member is disposed on the inner peripheral surface of the end of the underground structure with the concave portion as the outer peripheral side, and the inner peripheral flexible water blocking member is formed in the concave portion. The bending position regulating hollow member, which is disposed as the inner peripheral side, is provided with a slender proof bending member bent in its longitudinal direction once or plural times in a space formed between the recesses of the both flexible water blocking members. Since a load bearing mechanism having anchoring portions at both ends projecting outward from the end of the bending position regulating hollow member of the load bearing bending member inserted through the load bearing bending member is arranged, the joint between the underground structures opens due to ground movement and the earth and sand Even if the water penetrates into the joint and a large earth pressure is applied to the outer peripheral flexible water blocking member, the outer peripheral flexible water blocking member is supported by the load bearing mechanism.

In the yield strength mechanism, the bending path of the yield strength bending member in the bending position restricting hollow member is restricted by the inner surface of the bending position restricting hollow member, and the opening width of the bending position restricting hollow member is set in the bending position restricting hollow member. It exhibits a flat ring shape that bends as a diameter and connects both ends of the bent portion in a substantially straight line along the inner surface of the bending position regulating hollow member, and when a tensile force acts on both ends of this proof bending member, the proof bending member The flexion position regulation hollow member regulates free deformation, and the flexures at both ends are pulled together, and the interval between the flexures at both ends gradually narrows. This is caused by the bent portion extending and the adjacent portion newly bending (the bending portion moves in the longitudinal direction of the proof bending member), and the resistance force related to the movement of the bending portion at this time. Acts as tensile strength. That is, since free bending deformation is restricted by the bending position restricting hollow member, the bending portion of the yield strength bending member moves, and the force required for this movement acts as tensile strength. The yield strength bending member eventually becomes linear, and this linear state becomes the extension limit.

In such a load bearing mechanism, the pressure at the time of supporting the outer peripheral flexible water blocking member acts in a direction substantially orthogonal to the bending position regulating hollow member, while the underdrain connected by the ground movement due to an earthquake or the like is connected. At the time of displacement in the separating direction, a force pulling the yield strength bending member to both sides acts. The tensile force acting on the yield strength bending member at the time of displacement of the underground structure is an order of magnitude larger than the tension force acting on the yield strength bending member when supporting earth pressure through the outer peripheral flexible water blocking member, and therefore, By setting the material and diameter of the yield strength bending member and the opening width of the bending position regulating hollow member so that it does not expand with respect to earth pressure and allows displacement of the underground structure,
It is possible to sufficiently cope with a large earth pressure exceeding 3 kg / cm ² at the above high depth.

Even if the underground structures are separated from each other due to a ground change due to an earthquake or the like and a large stretch displacement occurs in the outer peripheral flexible waterproof member, the outer peripheral flexible waterproof member is pressed by the earth and sand and the load bearing mechanism (bending position regulation). It is possible to freely extend up to the extension limit of the proof bending member in a state of being crimped to the outer surface of the hollow member. Therefore, by setting the length of the bending position regulating hollow member and the bending overlap amount of the yield strength bending member in the bending position regulating hollow member according to the required amount of elongation displacement, it is possible to sufficiently cope with a large elongation displacement.

Further, according to the present invention, since the outer circumferential flexible water blocking member and the inner circumferential flexible water blocking member are provided, the joint can cope with earth pressure from the outside, and at the same time, the joint can be protected from the inside of the joint. Internal water pressure can also be dealt with. In addition, even if there is a possibility that the outer circumference flexible waterproofing member may be partially damaged due to the earth and sand that have entered the outside and are accompanied by strong earth pressure due to expansion and displacement of the joint due to expansion and contraction such as earthquakes and uneven settlement. Since the inner circumference flexible water blocking member can fulfill the secondary water blocking function, the safety of the joint is improved, and high performance can be exhibited as a joint having an anti-scratch and earthquake resistant structure.

Further, according to the present invention, when a large earth pressure is applied to the outer flexible water blocking member, the earth pressure is supported by the load bearing mechanism sealed by the inner and outer flexible water blocking members. Since the wire member uses the tensile strength due to the deformation in the shape regulated by the bending position regulation hollow member, the cross-section of the load-bearing member can be changed as compared with the case of supporting the pressure by utilizing the cross-section rigidity force, that is, the cross-section resistance moment. The size can be significantly reduced, the material cost can be saved, and the manufacturing cost can be reduced.

Further, in this structure, the load-bearing mechanism, which is usually made of a steel member, is arranged in a sealed state in the space between the flexible water blocking members and is not exposed, so that it is high in the underdrain. Even when used in a temperature environment, corrosion can be prevented and the durability of the joint can be increased.

In one embodiment of the present invention, the concave portion of the outer peripheral flexible water blocking member is formed by an annular constricted portion which bulges toward the outer peripheral side, and the concave portion of the inner peripheral flexible water blocking member is an inner peripheral portion. It is formed by an annular constriction that bulges to the side.

Further, according to one aspect of the present invention, at least a part of a space formed by the constricted portions of the outer circumferential flexible water blocking member and the inner circumferential flexible water blocking member is filled with a filler made of an elastic body. Characterize.

With this structure, when the joint is opened and the earth and sand enter the joint, it is possible to prevent the constriction from being reversed by the appropriate repulsive force of the filler.

In one embodiment of the present invention, the proof bending members are formed of rod-shaped members and are arranged at appropriate intervals in the circumferential direction of the joint, and the anchoring portions are fixed to the rod-shaped members at both ends thereof. It is composed of a plate-shaped member.

Further, in another embodiment of the present invention, the load bearing mechanisms are arranged at appropriate intervals in the circumferential direction of the joint, the load bearing bending member is formed of a rod-shaped member, and the anchor portion is the rod-shaped member. The member is a plate-like member fixed at both ends thereof.

In yet another embodiment of the present invention,
The load bearing mechanism is arranged at an appropriate interval in the circumferential direction of the joint,
The proof bending member is formed of a strip-shaped plate, and the anchoring portion is formed of a plate-shaped member to which the strip-shaped plate is fixed at both ends.

In another embodiment of the present invention, the load-bearing mechanism is arranged at appropriate intervals in the circumferential direction of the joint, the load-bearing bending member is formed by a strip-shaped plate, and the anchoring portion is formed by the strip-shaped plate. And a plate-shaped member formed integrally.

Further, in another aspect of the present invention, the anchoring portion of the load bearing mechanism is provided between the anchoring flange portion of the outer peripheral flexible water blocking member and the anchoring flange portion of the inner peripheral flexible water blocking member. And the outer end edge of the anchoring portion is present inside at least one outer end edge of the both flexible water blocking members.

With this structure, since the outer end edge of the anchoring portion of the load bearing member is surrounded by the outer end portions of both flexible water blocking members, corrosion is prevented and the durability of the joint can be further enhanced. .

In still another aspect of the present invention, an annular rigid body is disposed between the outer end surface of the anchoring flange portion of the outer peripheral flexible water blocking member and the step portion with or without a frame body. It is characterized by

With this structure, when earth pressure acts on the load bearing mechanism via the outer peripheral flexible water blocking member, the annular rigid body is attached to the outer peripheral flexible water blocking member of the outer wall of the load bearing mechanism. To prevent excessive compression of the anchoring flange.

[0027] In still another aspect of the present invention, the anchoring portion of the load bearing mechanism comprises the anchoring flange portion of the outer peripheral flexible water blocking member and the anchoring flange portion of the inner peripheral flexible water blocking member. The first nut, which is arranged between the members, is fastened to the anchoring flange portion of the outer peripheral flexible waterproof member with the anchoring portion of the load bearing mechanism by the first nut screwed into the bolt penetrating each member. It is characterized in that the anchoring flange portion of the inner circumference flexible water blocking member is tightened to the anchoring portion of the load bearing mechanism by a second nut that is screwed. With this configuration, tightening can be performed securely and strongly.

[0028]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is a sectional view of an embodiment of a joint for an underground structure according to the present invention, FIG. 2 is a perspective view when the joint of the present invention is applied to an underdrain, and FIG. 1 is a sectional view taken along line I-I of FIG. . FIG. 3 is an enlarged sectional view of a load bearing element of a load bearing mechanism, FIG.
3 is a plan view equivalent to FIG. 3, FIG. 5 is a perspective view showing the left half of the load bearing mechanism in FIG. 1, FIGS. 6A and 6B are partial sectional views showing the joint mounting structure, and FIG. FIG. 8 is a perspective view showing a modified example of the mechanism, FIGS. 8 and 9 are views showing various fixing structures of the load bearing bending member of the load bearing mechanism to the anchoring portion, and FIG. 10 is a perspective view of the push plate.

In FIG. 2, 1, 1'denotes an example of a culvert which has a circular cross section formed by pouring concrete. Stepped portions 3, 3 ′ are formed on the inner peripheral surface side edges of the opposed ends of the pair of underdrain 1, 1 ′, and the cylindrical frame body 4,
4'is fixed. Shape of frame 4'and underdrain 1 '
Since the mounting structure is exactly the same as that of the frame body 4, the reference numerals used for the frame body 4 and the like will be denoted by the numbers with a dash and the description of the frame body 4'and the like will be omitted.

The frame body 4 is made of iron or resin, and has an annular outer peripheral side flange portion 4a fixed to a step portion 3 formed on the inner peripheral surface of the end portion of the underdrain 1 and an outer peripheral side flange portion 4a. End face portion 4b extending toward the axis of 1 and end face portion 4b
And an annular inner peripheral side flange portion 4c extending on the inner peripheral surface of the end portion of the underdrain 1. 4d is a rising portion that projects outward from the outer peripheral flange 4a. The flange 4c is for increasing the cross-sectional rigidity of the frame body 4 and for facilitating the transportation and installation work thereof, and if the rigidity of the frame body can be secured even if 4c is omitted, it is not necessary.

The outer peripheral flange portion 4 of the frame bodies 4 and 4 '
An outer peripheral flexible water blocking member 6 formed of an elastic body such as rubber or synthetic resin in a short tubular shape is disposed between a and 4a '. The outer peripheral flexible water blocking member 6 has an annular constricted portion 6a at the center thereof, which has a substantially U-shaped cross section and bulges toward the outer peripheral side. In addition, it extends from both sides of the constricted portion 6a in the axial direction of the underdrain, and comes into close contact with the outer peripheral flange portion 4a of the frame body 4 and the end view.
An anchoring flange portion 6b reaching b is integrally formed. A reinforcing cloth A is embedded in the outer peripheral flexible water blocking member 6 in order to increase its strength. The reinforcing cloth A may be adhered to the inner and outer surfaces of the outer peripheral flexible water blocking member without being embedded, and may not be provided when the load is small or there is no danger of external damage such as earth and sand. Further, it may be provided on both the outer circumference flexible water blocking member 6 and the inner circumference flexible water blocking member 7 or only on the outer circumference flexible water blocking member 6.

Further, the outer peripheral side flange portion 4 of the frame bodies 4 and 4 '
Between the a and 4a ', an inner circumference flexible water stop member 7 formed of an elastic body such as rubber or synthetic resin in a short cylindrical shape is disposed on the inner circumference side of the outer circumference flexible water stop member 6. There is. The inner peripheral flexible water blocking member 7 has an annular constricted portion 7a at the center thereof, which has a substantially U-shaped cross section and bulges toward the inner peripheral side. Also this constricted part 7
An anchoring flange portion 7b extending in the axial direction from both sides of a and reaching the end surface portion 4b of the frame body 4 is integrally formed.

A load bearing mechanism 9 is provided in a space 8 formed between the constricted portion 6a of the outer circumferential flexible water blocking member 6 and the constricted portion 7a of the inner circumferential flexible water blocking member 7.

As shown in FIGS. 3 and 4, in the load bearing mechanism 9, a load bearing bar 91 formed of a metal rod having a predetermined diameter and having elasticity as a load bending member is bent once or a plurality of times (FIG. 3). (FIG. 4 shows a case where the bending pipe is bent once), and the bending portion is formed in a bending pipe 92 having a predetermined diameter and a predetermined length as a bending position regulating hollow member.
The load-bearing element 90 is formed by being positioned inside 2 and the load-bearing element 90 is formed, and the anchoring portions 93 are provided at both ends of the load-bearing bar 91 protruding from the both-end openings of the load-bearing pipe 92 of the load-bearing element 90. ing.

The load-bearing pipe 92 is formed of a flexible metal pipe, a cloth-wrapping type rubber hose, a flexible plastic pipe, or the like.

The bending path of the load bearing bar 91 in the load bearing pipe 92 is restricted by the inner surface of the load bearing pipe 92.
In the vicinity of both ends of the load bearing pipe 92, the load bearing pipe 92 is bent with the opening width as a diameter, and the bent portions at both ends have a flat ring shape in which the bent portions are connected in a substantially straight line along the inner surface of the load bearing pipe 92.

In this embodiment, the anchoring portion 93 is composed of a separate plate-like member 14 such as a steel plate fixed by nuts 15 at both threaded ends of the proof bar 91 as shown in FIG. Is. By arranging a plurality of the plate-shaped members 14 in the circumferential direction, the load bearing mechanism 9 in which the load bearing elements 90 are annularly arranged at predetermined intervals is formed as a whole. 14a
Is a through hole of the bolt 10.

In the load bearing mechanism 9, the anchoring portion 93 is sandwiched between the anchoring flange portion 6b of the outer peripheral flexible water blocking member 6 and the anchoring flange portion 7b of the inner peripheral flexible water blocking member 7. Further, the outer edge 93a of the anchoring portion 93 is arranged so as to be present inside the outer edge 6c of the outer peripheral flexible water blocking member 6 and the outer end edge 7c of the inner peripheral flexible water blocking member 7, and Thus, the load bearing pipe 92 is provided in the approximate center of the space 8.

Anchoring flange portion 6 of the outer peripheral flexible water blocking member 6
b, the anchoring flange portion 7b of the flexible water blocking member 7 and the anchoring portion 93 of the proof member 9 screw the nut 11 onto the bolt 10 penetrating these members and allow the inner periphery of the nut 11 and the nut 11 to penetrate. The push plate 12 is interposed between the flexible water member 7 and the anchoring flange portion 7b, and the nut 11 is tightened to be crimped to the inner peripheral surface of the outer peripheral flange portion 4a of the frame body 4, so that each is watertight. It is fixed. At the time of this fixing, Fig. 6 (a)
As shown in FIG. 3, the anchoring flange portion 6b of the outer peripheral flexible waterproofing member 6 is sandwiched between the inner peripheral surface of the outer peripheral flange portion 4a of the frame body 4 and the anchoring portion 93 of the load bearing mechanism 9, and these members are joined together. Screw the primary nut 11-1 onto the bolt 10 that penetrates it, and tighten it.
Further, the anchoring flange portion 7b of the inner circumference flexible water blocking member 7 and the pressing plate 12 are sequentially stacked, and the secondary nut 11-
A more effective tightening is possible if the two-stage tightening and fixing of 2 is tightened. Further, FIG. 6 (b) shows that the outer end of the anchoring flange 6b of the outer peripheral flexible water stop member 6 is closer to the outer end of the anchoring portion 93 of the load resisting member 9 and the outer end of the outer peripheral flange 4a of the frame body. A fixed amount is kept in the center line direction of the joint cross section, and a rigid body 50 made of steel, hard synthetic resin, or the like is arranged in the portion formed so as to be tightened and fixed in two stages as described above.

The load is applied from the outer peripheral flexible waterproofing member 6 to the proof bar 9
1 acts on the inner end portion of the anchor portion 93, but since the anchor portion 93 is made of a steel material or the like having a constant cross-sectional rigidity, the load is applied to the inner surface of the rigid body 50 and the frame. The load can be supported with the body flange 4a, the outer circumferential flexible water blocking member, and the outer surface of the primary nut 11-1 tightened with the bolt 10 penetrating near the center of the anchoring portion 93 as a fulcrum. it can. Therefore, the load can be transmitted to the frame body 4 without applying a load to the anchoring flange portions 7b and 6b of the inner and outer circumference flexible water blocking members.

Therefore, there is no fear that the waterproofing performance will decrease due to aged creep that occurs when the anchoring flange portions 6b and 7b receive a load, and reliable and stable tightening can be performed. The joint is compatible with.

FIG. 7 shows a modification of the proof mechanism 9 shown in FIG. In the load bearing mechanism 9 of FIG. 5, a plurality of load bearing elements 90 are fixed to one plate member 14, whereas in the load bearing mechanism 9 of FIG. 7, one load bearing element is attached to one plate member 16. The difference is that they are fixed by the nut 15. Reference numeral 15a is an insertion hole for the bolt 10.

Load bearing bar 91 of load bearing element 90 of load bearing mechanism 9
As a method of fixing to the plate-shaped member 14 forming the anchoring portion 93, as shown in FIGS. 5 and 7, a method of fixing the end portion of the proof bar 91 that is threaded with a nut (FIG. 8A) ), The load bearing bar 91 is attached to the plate-shaped member 1 as shown in FIG.
4 is welded to the inner peripheral surface of the end portion of No. 4, the end portion of the load bearing bar 91 is welded to the outer peripheral surface of the protruding edge 14a of the plate member 14, as shown in FIG. ) As shown in FIG. 9B, a method of welding the linear tip end of the proof bar 91 to the end edge of the plate member 14, and as shown in FIG. A method of inserting the end portion of the proof bar 91 into the through hole 14b and welding the same, as shown in FIG. 9 (b), the end portion of the plate member 14 is bent at a right angle to the inner peripheral side, A gap is formed between the bent end portion and the inner circumference flexible water blocking member 7, and the proof bar 9 is provided in this gap.
1 is inserted and welded to the bent end of the plate member 14, a through hole 14b is formed in the projecting end of the plate member 14 as shown in FIG. 9C, and this through hole is formed. Various fixing methods are possible, such as a method in which the end of the proof bar 91 bent inward on the inner peripheral side of 14b is threaded, the tip is inserted from the outer peripheral side, and the tip is fixed with a nut. An appropriate one may be selected and used in consideration of the purpose of use and the place of use of the middle joint of each of these fixing methods.

As shown in FIG. 10, the push plate 12 is provided with through holes 12a of the bolt 10 at appropriate intervals. In addition, screwing portions 12b are provided on one surface of the push plate 12 at appropriate intervals. In the present embodiment, the threaded portion 12b is shown by welding the bulky bolt, but the invention is not limited to this, and the protective member 17 described later such as one in which the push plate 12 is directly threaded is screwed by the bolt 18. Anything that can be fastened to the push plate 12 by fitting them together may be used. Further, the threaded portion 12b is used to fasten the protective member 17 with the bolt 18, and a large external force does not act on it. Therefore, it may be smaller than the number of the bolt insertion holes 12a.

As another mounting method of the protective material 17, FIG.
It is also possible to extend the end portion of the bolt 10 on the side of the underdrain axis of the bolt 10 without using 12b and 18 shown in FIG.

A protective member 17 is provided in the space formed between the frame body 4 and the inner flexible water blocking member 7. The protective material 17 prevents the inner circumferential flexible water blocking member 7 from bulging and deforming in the axial direction, isolates the bolt 10 and the nut 11 from the corrosive environment, protects them from external damage, and keeps the inner surface of the joint smooth. It is provided and is made of rubber, synthetic resin, or the like.

The protective member 17 is provided with a bolt insertion hole (not shown) for inserting the bolt 18.

The outer peripheral end surface of the protective member 17 abuts on the anchoring flange portion 7b of the inner peripheral flexible water blocking member 7, the outer peripheral surface thereof abuts on the end surface portion 4b of the frame body 4, and the inner side surface thereof prevents the inner peripheral flexible portion. The outer peripheral flange portion 4a of the frame body 4 is brought into contact with the side surface of the constricted portion 7a of the water member 7.
Is indirectly fixed to. That is, the protective material 17 is fixed to the pressing plate 12 by the bolts 18, and the pressing plate 12 is fixed to the outer peripheral flange portion 4a of the frame body 4 by the anchoring bolts 10 and the nuts 11, thereby indirectly connecting to the outer peripheral flange portion 4a. It is fixed.

In FIG. 1, reference numeral 19 is a joint material made of sponge rubber or the like which prevents soil and the like from entering the joint between the underdrain 1 and 1'in normal times.

When the joint 2 constructed as described above is displaced in the direction in which the connecting underdrains 1, 1 ′ are separated from each other due to an earthquake or ground movement, as shown by an assumed line in FIG. And the inner flexible water stop member 7 extends to form the constricted portion 6
The degree of constriction of a and 7a decreases. Earth pressure due to the sand and sand that has entered from the open joints acts on the upper surface (outer peripheral side) of the outer peripheral flexible water stop member 6, but the outer peripheral flexible water stop member 6 is supported by the load bearing mechanism 9 and is not reversed. Be blocked. In addition, in FIG. 11, the normal use position is shown by a solid line, and the connection culvert is shown by an assumed line in a state of being displaced to the allowable limit of the load bearing mechanism 9 (until the load bearing bar 91 of the load bearing element 90 becomes linear). is there.

Here, in the load bearing mechanism 9, when tensile force acts on both ends of the load bearing bar 91, free deformation of the load bearing bar is restricted by the load bearing pipes 92, and the bent portions at both ends are as shown by arrows in FIG. The gap between the bent portions on both ends gradually narrows. This occurs because the bent portion extends and the adjacent portion newly bends (the bent portion moves in the longitudinal direction of the load bearing bar), and the resistance force related to the movement of the bent portion at this time is generated. Acts as tensile strength. In other words, free bending deformation is caused by the yield pipe 92.
The bending portion of the proof bar 91 moves due to the restriction by the force, and the force required for this movement acts as tensile strength. The proof bar 91 finally becomes a straight line, and this straight line state becomes the extension limit.

In the load bearing mechanism 9 thus constructed, the pressure applied to support the outer peripheral flexible water blocking member 6 is set to the load bearing pipe 92.
On the other hand, when the culverts 1 and 1 ′ connected to each other are displaced in a direction away from each other due to ground movement due to an earthquake or the like, a force pulling the load bearing bar 91 to both sides acts. The tensile force acting on the proof bar 91 during the displacement of the underdrain 1, 1 ′ is orders of magnitude larger than the tensile force acting on the proof bar 91 when earth pressure is supported via the outer peripheral flexible water blocking member 6. By appropriately setting the material and diameter of the proof bar 91 and the opening width of the proof pipe 92, it is possible to set so as not to expand with respect to earth pressure and to allow the displacement of the underdrain 1, 1 '. it can.

Therefore, the underdrains 1 and 1'are separated from each other, and a large expansion displacement is generated in the outer peripheral flexible water blocking member 6, so that the outer peripheral flexible water blocking member 6 is pressed by the earth and sand and the load bearing mechanism 9 (bearing force pipe 9
Even if it is crimped to the outer surface of (2), if the load is below a certain amount (for example, allowable load), the load-bearing bar does not expand and it expands for the first time due to unequal subsidence due to ground subsidence or a strong pulling force during an earthquake. The load-bearing mechanism 9 can freely extend up to the extension limit of the load-bearing bar 91, and the length of the load-bearing pipe 92 or the stacking of the load-bearing bar 91 in the load-bearing pipe 92 can be adjusted according to the required amount of extensional displacement. By setting the amount and the number of polymerizations, it is possible to sufficiently cope with a large elongation displacement.

Since the above-mentioned proof mechanism 9 prevents the elongation beyond the extension limit, the joint is highly safe and reliable.

FIG. 12 is a sectional view showing another embodiment of the joint according to the present invention. 12 and subsequent embodiments, the same components as those of the embodiment of FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted. Further, in the embodiments shown in FIG. 12 and subsequent figures, only the main part of the joint is shown by reference numerals, and the details are omitted.

In the embodiment shown in FIG. 12, the filling material 20 made of an elastic material is filled in the space formed between the proof member 9 and the constricted portion 6a of the outer circumferential flexible water blocking member 6. Therefore, it differs from the embodiment of FIG. As the filler 20,
When the joint is opened and the earth and sand enter the joint, the filler 20
The outer circumferential flexible water blocking member 6 is supported against the earth pressure applied to the outer circumferential flexible water blocking member 6 due to the repulsive force of the outer circumferential flexible water blocking member 6 and has elasticity sufficient to prevent the outer circumferential flexible water blocking member 6 from being crushed. A material is selected, and as such a material, foam rubber, cushion rubber, etc. are particularly suitable. With this configuration, the constriction 6a of the outer peripheral flexible water blocking member 6 can be more reliably prevented from being reversed.

FIG. 13 is a sectional view showing another embodiment of the joint according to the present invention. In this embodiment, in the load bearing mechanism 9, the load bearing bending member of the load bearing element 90 is different from the rod-shaped load bearing bar 91 in the embodiment of FIG. 1, and as shown in the perspective view of FIG. And
The anchoring portion 96 is made of a plate-shaped member that is integrally formed with a member that forms the load bearing plate 95. When the load bearing plate 95 is integrally formed in this way, the steel plate can be easily manufactured by bending, so that the working and the assembly of the joint are easy. Incidentally, 96a in FIG.
Is a through hole for inserting the bolt 10.

As a modification of the embodiment of FIG. 14, as shown in FIG. 15, a load bearing plate 97 is formed of a strip steel plate,
The anchoring portion 98 may be formed of a plate-shaped member that is separate from the anchoring portion 98, and these two members may be fixed to each other by bolting, welding, or the like.

In each of the above-mentioned embodiments, the outer edges of the anchoring portions 93, 96, 98 of the load bearing mechanism 9 are located inside the outer edges of the flexible water blocking members 6, 7. This structure is effective and preferable for preventing corrosion of the anchored portion of the load bearing mechanism, but if such corrosion of the anchored portion does not pose a problem, the outer end of the anchored portion is not always required. As shown in FIG. 16, the outer edge 93a of the anchoring portion 93 of the load bearing mechanism 9 does not have to be inside the outer edge of the both flexible water blocking members, and the outer edge 93a of the both flexible water blocking members is the outer edge 6c. , 7c may be extended.

Further, the constricted portions 6a, 7a of the outer circumferential flexible water blocking member 6 and the inner circumferential flexible water blocking member 7 are not limited to those having U-shaped cross sections as shown in the above-mentioned embodiments, but the joints are displaced. In this case, in order to improve the displacement followability of the flexible water blocking member and reduce the displacement resistance of the joint anchoring portion, an arbitrary shape such as a bellows shape having a plurality of constricted portions as shown in FIG. 17 is used. You can choose.

Furthermore, the degree of constriction of each constricted portion 6a, 7a of the outer circumferential flexible water blocking member 6 and the inner peripheral flexible water blocking member 7 can be appropriately changed based on conditions such as the displacement allowable set amount. As shown in FIG. 19, the proof force is applied to the inner circumference of the outer circumferential flexible water blocking member 6 and the outer circumference of the inner circumferential flexible water blocking member 7 without providing a constricted portion. Recesses 61, 71 extending in the circumferential direction of the joint so as to form a space 8 capable of accommodating the load bearing element of the mechanism 9.
May be formed.

Further, the joint portion other than the essential constituent features of the present invention can be variously modified in addition to those described in the above embodiments. For example, the frame 4 is also shown in FIG.
20, the inner peripheral flange portion 4c is arranged so as to extend to the peripheral surface of the second step portion 33 formed on the inner peripheral side of the step portion 3 shown in FIG. Alternatively, a part of the protective material 37 may cover the inner peripheral side flange portion 4c. With this configuration, the inner peripheral flange portion 4 of the frame body 4
Since c is not directly exposed to the high humidity atmosphere in the underdrain, the durability of the joint can be improved.

Further, instead of assembling and constructing the entire joint by construction on site, the frame 4 can be eliminated by adopting a method of assembling the underdrain 1, 1'into one unit at the factory.

Further, in each of the above embodiments, the protective material 1
7 is used, it goes without saying that the present invention can also be applied to a joint that does not use a protective material.

FIG. 21 is a sectional view showing still another embodiment of the present invention. In this embodiment, the outer end edge 6c of the outer peripheral flexible water blocking member 6 terminates inside as compared with the embodiment of FIG.
The outer edge 93a of the anchoring portion 93 of the load bearing mechanism 9 extends to the end surface portion 4b of the frame body 4. Between the outer edge 6c of the flexible water blocking member 6 and the end surface portion 4b of the frame body 4, annular rigid bodies 50, 50 'made of steel, hard resin or the like are arranged. Earth pressure acts, the outer peripheral flexible water blocking member 6 receives the pressure and is displaced in the inner peripheral direction, and the load bearing mechanism 9 supports it. A strong load is applied to the inside of the anchoring portion from the end of the load bearing mechanism 9. In the case where the bolts 10 and the nuts 11 are provided in the vicinity of the center of the anchoring portion 93 of the proof mechanism 9,
Since it is tightened by, etc., it is in a supporting and fixed state,
Due to the load, the anchor portion 93 tends to be rotationally displaced around the penetration portion of the bolt 10. Therefore, the flexible water blocking member 6
The outer portion of the anchoring flange 6b and the vicinity of the base of the curved portion of the anchoring flange 7b of the flexible water blocking member 7 are extremely compressed and deformed, and the anchoring portion becomes unstable, and the anchoring degree is reduced or water leakage occurs. Cause of. In order to prevent this, the rigid bodies 50 and 50 'are provided to suppress the compressive displacement of the side portions of the anchoring portion 6b of the outer peripheral flexible water blocking member 6. The rigid bodies 50, 50 'may be integrally welded to the frame bodies 4, 4'or the anchor portions 93, 93' of the load bearing mechanism 9 or may be inserted as separate bodies.

FIG. 22 is a sectional view showing a modification of the embodiment shown in FIG. In this embodiment, the frame 4 is not provided, and the vertical portion 55a of the upper push plate 55 having an L-shaped cross section.
Is disposed so as to be interposed between the outer end edge 6c of the outer peripheral flexible water blocking member 6 and the end surface of the step portion 3. This vertical part 55
The function of a is the same as that of the rigid body 50 in the embodiment of FIG.

FIG. 23 is a sectional view showing a modification of the embodiment shown in FIG. In this embodiment as well, the frame 4 is not provided, and the vertical portion 93b of the anchoring portion 93 of the load bearing mechanism 9 having an L-shaped cross section forms the outer edge 6c of the outer circumferential flexible water blocking member 6 and the step portion 3. It is arranged so as to intervene between the end face. The function of the vertical portion 93b is that the rigid body 5 in the embodiment of FIG.
It is the same as 0. When the rigid body 50 of FIG. 21, the vertical portion 55a of FIG. 22, and the vertical portion 93b of FIG. 23 are arranged, it is effective to fix them in two stages as shown in FIG. 6A when fixing. Further, as shown in FIG. 6B, it is more effective to dispose a rigid body and fasten it in two stages.

In each of the above-mentioned embodiments, the example of applying the underdrain joint to the connection of the concrete underdrain has been shown, but the joint of the underground construction of the present invention is not limited to the concrete underdrain, and is made of other materials. It may be applied to various underground structures.

The sectional shape of the underground structure is not limited to the circular shape, and may be any of an elliptical shape, a quadrangular shape, and other polygonal shapes. Further, this underground structure may be an integral product or a dividing member. It may be assembled and configured.

[0070]

As is apparent from the above description, according to the present invention, the outer peripheral flexible water blocking member is disposed over the inner peripheral surface of the end portion of the underground structure with its concave portion on the outer peripheral side,
The inner peripheral flexible water blocking member is disposed with its concave portion on the inner peripheral side, and the elongated proof bending member makes one turn in the longitudinal direction in the space formed between the concave portions of the both flexible water blocking members. Since a load bearing mechanism having a anchoring portion at each end protruding outward from the end portion of the bending position regulating hollow member of the yield strength bending member that is inserted through the bending position regulating hollow member in a state of being bent multiple times is arranged, Even if the joints between the underground structures open due to fluctuations and the earth and sand enter the joints and a large earth pressure is applied to the outer circumference flexible water stop member, the outer circumference flexible water stop member is supported by the load bearing mechanism to generate a large earth pressure. Can bear.

In the load bearing mechanism, when both ends of the load bearing bending member are pulled, free bending is restrained by the bending position regulating hollow member and the bent portions at both ends are pulled up, and the resistance force at this time acts as tensile strength. It withstands the pulling force that acts on the yield strength bending member when supporting earth pressure through the outer circumference flexible water blocking member, and is a force bending member when the underground structure is displaced by an order of magnitude larger than this. By setting the gap of the load bearing mechanism, the material and diameter of the load bearing bending member, and the opening width of the bending position regulating hollow member so as to allow the displacement of the underground structure with respect to the acting pulling force,
It can sufficiently cope with a large earth pressure exceeding 3 kg / cm ² at a high depth of 0 m or more.

Further, even if the underground structures are separated from each other due to the ground movement due to an earthquake or the like and a large stretch displacement occurs in the outer circumferential flexible water blocking member, the outer circumferential flexible water blocking member is pressed by the sand and the load bearing mechanism (of It is possible to freely extend up to the extension limit of the yield strength bending member while being crimped to the bending position regulating hollow member outer surface). Therefore, it is possible to sufficiently cope with a large elongation displacement by setting the length of the bending position regulating hollow member and the bending polymerization amount and the number of times of polymerization of the yield strength bending member in the bending position regulating hollow member according to the required amount of elongation displacement. You can

Further, according to the present invention, since the outer circumferential flexible water blocking member and the inner circumferential flexible water blocking member are provided, the joint can cope with earth pressure from the outside, and at the same time, the joint from inside the joint can be treated. Internal water pressure can also be dealt with. In addition, even if there is a possibility that the outer circumference flexible waterproofing member may be partially damaged due to the earth and sand that have entered the outside and are accompanied by strong earth pressure due to expansion and displacement of the joint due to expansion and contraction such as earthquakes and uneven settlement. Since the inner circumference flexible water blocking member can fulfill the secondary water blocking function, the safety of the joint is improved, and high performance can be exhibited as a joint having an anti-scratch and earthquake resistant structure.

Further, according to the present invention, the load bearing mechanism for supporting the earth pressure acting on the outer circumferential flexible water blocking member utilizes the tensile strength due to the yield strength bending member being deformed in the shape regulated by the bending position regulating hollow member. Therefore, the cross-section of the load-bearing member can be made significantly smaller than that in the case where the pressure is supported by using the cross-section rigidity, the material cost can be saved, and the manufacturing cost can be reduced.

Further, in this structure, the load bearing mechanism which is usually made of a steel member is arranged in a sealed state in the space between both flexible water blocking members, and is exposed to the inside of a high humidity underground structure. Therefore, corrosion can be prevented and the durability of the joint can be improved.

Further, the load bearing mechanism is fixed to the inner peripheral surface of the end of the underground structure or the inner peripheral surface of the step, and the load bearing mechanism itself expands and contracts in accordance with expansion and contraction of joints between underground structures. , The structure of the joint as a whole can be simplified compared to the joint using the conventional load bearing member without the need for an anchoring box to accommodate the end of the load bearing member, and the labor for mounting the joint can be saved, and the manufacturing cost can be reduced. Can be reduced.

Other operational effects of the present invention will be apparent from the description of the above-mentioned "Means and Actions for Solving Problems" and the description of the specification.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment in which the present invention is applied to an underdrain.

FIG. 2 is a perspective view when the present invention is applied to an underdrain.

FIG. 3 is an enlarged sectional view of a load bearing element of a load bearing mechanism.

4 is a view corresponding to the plan view of FIG. 3. FIG.

FIG. 5 is a partial perspective view showing an example of a load bearing mechanism.

FIG. 6 is a cross-sectional view showing another embodiment of the method of anchoring each member of the joint.

FIG. 7 is a partial perspective view showing another example of the load bearing mechanism.

FIG. 8 is a diagram showing a method of fixing a load bearing bar constituting a load bearing mechanism to a plate member.

FIG. 9 is a diagram showing another method of fixing the load bearing bar constituting the load bearing mechanism to the plate member.

FIG. 10 is a perspective view of a push plate.

FIG. 11 is a view showing the operation of the joint according to the present invention.

FIG. 12 is a sectional view showing another embodiment of the joint according to the present invention.

FIG. 13 is a sectional view showing another embodiment of the joint according to the present invention.

FIG. 14 is a perspective view of a load bearing mechanism used in the embodiment of FIG.

FIG. 15 is a perspective view showing another embodiment of the load bearing mechanism.

FIG. 16 is a cross-sectional view showing a modified example of the anchoring portion of the load bearing mechanism.

FIG. 17 is a cross-sectional view showing a modified example of the flexible water blocking member.

FIG. 18 is a sectional view showing another embodiment of the joint according to the present invention.

FIG. 19 is a sectional view showing another embodiment of the joint according to the present invention.

FIG. 20 is a sectional view showing another embodiment of the joint according to the present invention.

FIG. 21 is a sectional view showing another embodiment of the joint according to the present invention.

FIG. 22 is a sectional view showing another embodiment of the joint according to the present invention.

FIG. 23 is a sectional view showing another embodiment of the joint according to the present invention.

FIG. 24 is a sectional view showing an example of a conventional underdrain joint.

FIG. 25 is a cross-sectional view showing another example of a conventional underdrain joint.

[Explanation of symbols]

 1,1 'Underdrain 2 Joint 6 Outer peripheral flexible water blocking member 6a Constricted portion 6b Anchored flange portion 61 Recessed portion 7 Inner peripheral flexible water stopped member 7a Constricted portion 7b Anchored flange portion 71 Recessed portion 9 Bearing mechanism 90 Bearing element 91 Strength Bar (proof bending member) 92 Proof pipe (hollow member for controlling bending position) 93 Anchoring portion 95 Proof plate (proof bending member) 96 Anchoring portion 98 Anchoring portion

Claims (9)

[Claims] 1. A short tubular shape made of an elastic material such as rubber or synthetic resin, straddling step portions formed on the inner peripheral surfaces of the end portions of a pair of opposed underground constructions,
An outer peripheral flexible waterproof member having an annular concave portion formed on the inner periphery thereof and anchoring flange portions on both sides of the concave portion, and a short tubular shape made of an elastic material such as rubber or synthetic resin,
An inner peripheral flexible water blocking member having an annular recess formed on the outer periphery thereof and anchoring flange portions on both sides of the recess is secured at each anchoring flange portion, and an elongated proof bending member has a long length. A bending mechanism which is inserted into a bending position regulating hollow member of a predetermined length in a state where it is bent once or a plurality of times in a direction, and which has an anchoring portion at each end protruding from the bending position regulating hollow member of the proof bending member, The step is formed through the anchoring portion such that the bending position regulating hollow member is located in the space formed by the annular recess of the outer peripheral flexible water blocking member and the annular recess of the inner peripheral flexible water blocking member. A joint for an underground structure, which is characterized by being fixed to the part. 2. The concave portion of the outer circumferential flexible water blocking member is formed by an annular constricted portion that bulges outward, and the concave portion of the inner circumferential flexible water blocking member bulges toward the inner circumferential side. 2. The constricted portion is formed.
Underground construction fittings described in. 3. A filling material made of an elastic material is filled in at least a part of a space formed between the outer circumferential flexible water blocking member and the inner circumferential flexible water blocking member. Joints for the listed underground structures. 4. The load-bearing mechanism is arranged at appropriate intervals in the circumferential direction of the joint, the load-bearing bending member is formed of a rod-shaped member, and the anchoring portion is formed by fixing the rod-shaped member at both ends thereof. The joint for an underground structure according to any one of claims 1 to 3, which is made of a plate-shaped member. 5. The load-bearing mechanism is arranged at appropriate intervals in the circumferential direction of the joint, the load-bearing bending member is formed of strip-shaped plates, and the anchoring portion is fixed to the both ends of the strip-shaped plates. The joint for an underground structure according to any one of claims 1 to 3, which is made of a plate-shaped member. 6. The load-bearing mechanism is arranged at appropriate intervals in the circumferential direction of the joint, the load-bearing bending member is formed by a strip-shaped plate, and the anchoring portion is formed integrally with the strip-shaped plate. It consists of a plate-shaped member.
The joint of the underground structure according to any one of 3 above. 7. An anchoring portion of the load bearing mechanism is sandwiched between an anchoring flange portion of the outer peripheral flexible water blocking member and an anchoring flange portion of the inner peripheral flexible water blocking member, and The joint of an underground construction according to any one of claims 1 to 6, wherein an outer edge of the anchoring portion is present inside at least one outer edge of the flexible water blocking members. 8. An annular rigid body is arranged between the outer end surface of the anchoring flange portion of the outer circumferential flexible water blocking member and the step portion with or without a frame body. 1-6
A joint for an underground structure according to any one of 1. 9. The anchoring portion of the load bearing mechanism is disposed between the anchoring flange portion of the outer peripheral flexible water blocking member and the anchoring flange portion of the inner peripheral flexible water blocking member. The first nut screwed to the bolt penetrating the member tightens the anchoring part of the load bearing mechanism to the anchoring flange part of the outer peripheral flexible waterproof member, and the second nut screwing to the bolt The joint for underground construction according to any one of claims 1 to 8, wherein the anchoring flange portion of the inner circumference flexible water blocking member is tightened to the anchoring portion of the load bearing mechanism.