JPH07173865A - Coupling for underground building - Google Patents

Abstract

PURPOSE:To improve the strength of a coupling by a method wherein outer and inner peripheral movable cutoff members, which are formed of a resilient material, are fixed between the end parts of a pair of opposite underground structures and a yield strength member is disposed between the two movable cutoff members. CONSTITUTION:Cylinder anchoring members 4 and 4' are fixed to stepped parts 3 and 3' formed in the inner peripheries of the opposite end parts of culverts 1 and 1'. Outer and inner peripheral movable cutoff members 6 and 7, both formed of a rubber, having annular constriction parts 6a and 7a in a U-shape in cross section and anchoring flanges 6b and 7b, respectively, are disposed to a cutoff member 7. In this case, a yield strength member 9, formed of a bar steel having a curved part 9a and an anchoring part 9b is disposed in a gap 8 between the cutoff members 6 and 7. Further, anchoring parts 6b, 7b and 9b are fixed to the anchoring member 4 through a bolt 10. This constitution supports the cutoff member by the yield strength member even when a high earth pressure is exerted on the cutoff member owing to the occurring of an earthquake and improves corrosion resistance and durability since the yield strength member is surrounded with the cutoff member.

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 disclosed in Japanese Patent Publication No. 63-58982 proposed by the present applicant has, as shown in the sectional view of FIG. 14, a pair of opposed underdrain a, a'ends. 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 peripheral 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 ' In the space formed between the flexible water blocking member e and the flexible water blocking member e, protective materials f and f'for preventing bulging deformation of the joint cross section of the flexible water blocking member e in the horizontal axis direction are arranged. is there. It should be noted that g and g ′ are frame bodies having flanges h, h ′, j and j ′ and end face portions i and 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 on a pair of annular anchoring boxes m, m ′ attached to the end faces of a pair of underdrain a, a ′ to be connected have a fixed range. It is inserted and connected so as to be movable inside and not to come off, and the space between the anchoring boxes is disposed outside the annular row of the plurality of load-bearing members, and the end portions are provided on the side walls n and n'of the anchoring boxes. A watertight connection is made by each flexible water-blocking member Q in the shape of a short tube in which is fixed, and a cylindrical body t slightly shorter than the initial distance between the side walls n, n'of both anchoring boxes is loosely fitted to the outer periphery of each load-bearing member. It is a thing. In this joint, a flexible water blocking member Q by external water pressure is provided by loosely fitting a tubular body t on the outer periphery of a load bearing member p.
By preventing the load bearing member p from sagging into the load bearing member p, the load bearing member p supported by the anchoring boxes m and m ′ is formed to have a necessary minimum strength, which improves the handleability of the load bearing member p and saves the material. It is intended to

[0004]

In recent years, various new technologies for constructing deep underground structures have been developed and put into practical use against the backdrop of increasing social demands for advanced utilization of underground spaces. Large-scale excavation, which was not possible with the construction method, has become possible due to the generalization of the underground continuous wall construction method, and the technological progress of the shield construction method has enabled the construction of large-depth and large-diameter tunnels. Large-scale projects are underway in various places using technology. In this way, as the size and depth of underground structures are rapidly increasing, there is a demand for appropriate performance for joints that are indispensable for ensuring the safety of structures, and there is a demand for higher performance. There is.

However, the joint described in Japanese Patent Publication No. 63-58982 (FIG. 14) 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 regarding extension displacement, when extension displacement occurs and sand 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 also suppressed to this extremely small amount. This amount corresponds to the expansion and contraction joint width that is generally provided for civil engineering buildings, and it is difficult to absorb the elongation displacement caused by large ground movement due to an earthquake or the like.

Further, since the joint described in Japanese Patent Publication No. 61-37515 (FIG. 15) 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. In addition, it is possible to cope with a large elongation displacement caused by ground deformation due to an earthquake, etc., but the structure is complicated and the joints m and m ′ are required, so that the joint There is a problem that it becomes large in size, laborious to mount, and expensive to manufacture. Further, when the metal load bearing member is used inside a high humidity underdrain, a problem that the load bearing member is easily corroded and the life of the load bearing member is shortened is likely to occur.

The present invention has been made in order to solve the problems of the above-mentioned conventional joints when dealing with the sophistication of joint performances due to the increase in depth of underground structures, and it is relatively small and simple. Despite its unique 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 underground structure joint with excellent corrosion resistance and rich durability. Is to provide.

[0008]

Means and Actions for Solving the Problems A joint for an underground structure which achieves the above-mentioned object of the present invention extends over a stepped portion formed on the inner peripheral surface of the ends of a pair of opposed underground structures. , A flexible water-proof outer circumference, each of which is formed in a short tubular shape made of an elastic material such as rubber or synthetic resin, and has an annular constriction portion that bulges toward the inner peripheral side and anchoring flange portions that extend from both sides of the constriction portion. Member and inner flexible water blocking member are fixed to each anchoring flange portion, and a bending-resistant member having a curved portion and anchoring portions extending from both sides of the curved portion is formed so that the curved portion extends to the inner peripheral side. It is characterized in that it is disposed between the outer peripheral flexible water blocking member and the inner peripheral flexible water blocking member, and is fixed to the stepped portion at the anchoring portion.

According to the present invention, the outer circumferential flexible water blocking member and the constricted portion of the inner circumferential flexible water blocking member are bulged toward the inner circumferential side over the inner circumferential surface of the end of the underground structure. Since it was installed between the flexible water blocking members so that the bending part of the load bearing member was extended to the inner circumference side, the joint between the underground structures opened due to ground movement, and the earth and sand entered the joint. Even if a large earth pressure is applied to the outer peripheral flexible water blocking member, the outer peripheral flexible water blocking member is able to withstand a large earth pressure by being supported by the cross-section tensile strength of the inner peripheral side proof member. Therefore, by setting the strength of the load bearing member appropriately, 20m
It is possible to sufficiently cope with a large earth pressure of 3 kg / cm ² or more at the above high depth.

Further, even when a large elongation displacement occurs due to a ground change due to an earthquake or the like, the outer circumference flexible waterproof member can be stretched by a curved proof member while being pressed by the earth and sand and pressure-bonded to the proof member. (Ie, until the load bearing member is straight). As the displacement progresses, the bearing ring becomes a straight line, but the bearing ring and bearing plate exert a stopper function to prevent the joint from being damaged by excessive displacement. Therefore,
By setting the dimensions of the bulging portion of the flexible water blocking member and the curved portion of the proof member in accordance with the required amount of extensional displacement, large extensional displacement can be sufficiently accommodated.

Further, according to the present invention, since the outer circumferential flexible water blocking member and the inner circumferential flexible water blocking member whose constricted portions are bulged toward the inner circumferential side are respectively provided, the joint is protected from earth pressure from the outside. In addition to being able to deal with it, it is possible to deal with the internal water pressure from inside the joint. Moreover, even if the outer peripheral flexible waterproofing member may be partially damaged due to the earth and sand with strong earth pressure invading from the outside, the joint expands and displaces due to expansion and contraction and uneven settlement during an earthquake. 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 as a joint having an anti-scratch structure and a seismic resistant structure can be exhibited.

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 strength member sealed by the inner and outer flexible water stopping members. Since the cross-section tensile strength of the member is used, the cross-section of the load-bearing member can be made significantly smaller than that in the case of supporting the pressure by using the cross-section rigidity force, that is, the cross-section resistance moment, thus saving the material cost. This can contribute to the reduction of manufacturing cost.

Further, in this structure, the load-bearing member, which is usually made of steel, is arranged in a sealed state in the gap between the flexible water blocking members, and is not exposed inside the high-humidity underground structure. In addition, since the gap between the two flexible water blocking members is extremely narrow and the oxygen supply is cut off, corrosion of the load bearing member is prevented and the durability of the joint can be improved.

Further, according to one aspect of the present invention, a joint for an underground structure is characterized in that a filling material made of an elastic material is attached to a space formed by the constricted portion of the outer circumferential flexible water blocking member.

Normally, joints with a constant width are set on the center outer surface of the joint cross section on the concrete frame around the joint. However, when the joint width is widened due to ground movement and the earth and sand enter the joints, this filling is performed. If there is no material, the sand and sand that enter the joint and the groundwater pressure will easily enter and fill the constricted part of the outer perimeter flexible waterproofing member, and due to the filled sand and sand, the displacement followability of the joint will be reduced. Although it may be hindered and the allowable displacement of the joint may be reduced, the mounting of the filler can overcome such a problem.

In one embodiment of the present invention, the bending portion of the load-bearing member is composed of a plurality of curved rod-shaped members arranged at appropriate intervals in the circumferential direction of the joint, and the anchoring portion has both end portions of the rod-shaped member. It is composed of a plate-shaped member fixed in.

In another embodiment of the present invention, the load-bearing member is an integrally-molded member whose curved portion is continuous in the circumferential direction of the joint, and the anchor portion has the members forming the curved portion at both ends thereof. It is composed of a fixed plate member.

[0018] In still another embodiment of the present invention, the load-bearing member is an integrally molded member having a curved portion continuous in the circumferential direction of the joint, and the anchored portion is integral with the member forming the curved portion. It is composed of a plate-shaped member molded into.

Further, in another aspect of the present invention, the anchoring portion of the load bearing member is sandwiched 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 edge of the anchoring portion is present inside at least one outer edge of the flexible water blocking members.

With this configuration, the anchoring portion of the load bearing member has its outer end edge surrounded by at least one of the outer end portions of both flexible water blocking members, so that corrosion is prevented and the durability of the joint is improved. It can be further enhanced.

[0021]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 7 show one embodiment of a joint for an underground structure according to the present invention, and FIG. 1 is a sectional view of the joint,
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 a perspective view showing the left half of the load bearing member in FIG. 1, FIG. 4 is a perspective view showing a modified example of the load bearing member, and FIGS. 5 and 6 are various rod-shaped members to plate-shaped members constituting the load bearing member. FIG. 7 is a view showing a fixing method, and FIG. 7 is a perspective view of the push plate.

In FIG. 2, reference numerals 1 and 1'indicate an underdrain, which has a circular cross section formed by casting concrete. The opposite ends of the pair of underdrain 1, 1'are
They are connected by the joint 2 according to the present invention.

The underdrain joint 2 is, as shown in FIG.
A step portion 3 is formed on the inner peripheral surface side peripheral edge of the opposite ends of the underdrain 1, 1 ′.
3'is formed. Since the structure of the stepped portion 3'is exactly the same as that of the stepped portion 3, the reference numerals used for the stepped portion 3 and the like are numbered with a dash, and the description of the stepped portion 3'and the like will be omitted.

Outer peripheral surfaces 3a, 3a 'of the step portions 3, 3'
A cylindrical anchoring member 4, 4'is fixed to the outer peripheral flexible stopper formed of an elastic material such as rubber or synthetic resin in a short tubular shape between the anchoring members 4, 4 '. A water member 6 is provided. The outer peripheral flexible water blocking member 6 has a cross section of approximately U at the center thereof.
It has an annular constricted portion 6a that bulges toward the inner peripheral side of the character. Further, anchoring flange portions 6b extending from both sides of the constricted portion 6a in the axial direction of the underdrain and closely contacting with the inner peripheral surface of the anchoring member 4 and reaching the end surface portion 3b of the step portion are integrally formed. A reinforcing cloth (not shown) may be embedded in the outer peripheral flexible water blocking member 6 to increase its strength. In addition,
The reinforcing cloth may be provided on both the outer peripheral flexible water blocking member and the inner peripheral flexible water blocking member. Further, the outer end portion 6c of the anchoring flange portion 6b of the outer peripheral flexible water blocking member 6 projects to the inner peripheral side.

Between the anchor members 4 and 4 ', the inner circumference flexible water stop formed on the inner circumference side of the outer circumference flexible water stop member 6 from an elastic material such as rubber or synthetic resin in a short cylinder shape. A member 7 is provided. The inner circumferential flexible water blocking member 7 has a cross section of approximately U at the center thereof.
It has an annular constricted portion 7a that bulges toward the inner peripheral side of the character. Also, extending from both sides of the constricted portion 7a in the axial direction,
An anchoring flange portion 7b that is in contact with an inner end surface of an outer end portion 6c of the anchoring flange portion of the outer peripheral flexible water blocking member 6 is integrally formed.

Outer peripheral flexible water blocking member 6 and inner peripheral flexible water blocking member 7
In the small gap 8 formed between the curved portion 9a and the curved portion 9a, a load bearing member 9 having a curved portion 9a having a substantially U-shaped cross section and anchored portions 9b extending in the axial direction from both sides of the curved portion 9a is formed. And the anchoring portion 9b is located 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. It is held, and the outer edge 9c of the anchoring portion 9b is the outer edge 6 of the outer peripheral flexible water blocking member 6.
It is arranged so that it exists inside c.

Anchoring flange portion 6 of the outer peripheral flexible water blocking member 6
b, the anchoring flange portion 7b of the inner circumferential flexible water blocking member 7 and the anchoring portion 9b of the proof member 9 are formed by screwing a nut 11 into a bolt 10 penetrating these members and the anchoring member 4 and 11 and the anchoring flange portion 7b of the inner circumference flexible water blocking member 7, a pressing plate 12 is interposed, and the nut 11 is tightened to be crimped to the inner peripheral surface of the anchoring member 4 so that each is watertight. It is fixed to.

In this embodiment, as shown in FIG. 3, the bending portion 9a of the proof member 9 is composed of a plurality of curved bar-shaped members 13 such as steel bars arranged at appropriate intervals in the circumferential direction of the joint 2. The anchoring portion 9b is composed of a plate-shaped member 14 such as a separate steel plate to which a plurality of rod-shaped members 13 are fixed by nuts 15 at both threaded ends thereof.
By arranging a plurality of plate-shaped members 14 in the circumferential direction, an annular bearing member 9 is formed as a whole. 14a
Is an insertion hole for the bolt 10. The curved portion of the rod-shaped member 13 should be set to have a corner portion with a curvature as large as possible so that the entire shape is close to a semi-circle in order to easily support the load acting on the outer peripheral flexible waterproof member by its tensile strength. Is preferred.

FIG. 4 shows a modification of the proof member 9 shown in FIG. In the load bearing member 9 of FIG. 3, a plurality of rod-shaped members 13 are fixed to one plate member 14, whereas the load bearing member 9 of FIG. 4 is one rod member for one plate member 16. The difference is that 13 is fixed by a nut 15. 15
a is an insertion hole for the bolt 10.

As a method of fixing the rod-shaped member 13 forming the curved portion 9a of the load-bearing member 9 to the plate-shaped member 9b forming the anchored portion 9b, a rod-shaped member having a thread cut as shown in FIGS. 3 and 4 is used. Method of fixing the end of 13 with a nut (Fig. 5
In addition to (a)), as shown in FIG.
3 is welded to the inner peripheral surface of the end of the plate member 14, FIG.
As shown in FIG. 5C, the end portion of the rod-shaped member 13 is bent at a right angle and welded to the inner peripheral surface of the projecting end portion 14a of the plate-shaped member 14, as shown in FIG. 5D. A method of bending the end portion of 13 and welding the tip end thereof to the edge of the plate-shaped member 14, the straight end of the rod-shaped member 13 as shown in FIG. Method of welding to the edge, FIG. 6
As shown in FIG. 6 (b), a through hole 14b is provided at the end of the projecting plate member 14, and the end of the rod member 13 is inserted into the through hole 14b and welded. As shown, the end portion of the plate-shaped member 14 is bent to the inner peripheral side at a right angle, and a gap is formed between the bent end portion and the inner peripheral flexible water blocking member 7, and the rod-shaped member is formed in this gap. Various fixing methods such as a method of inserting the end portion of 13 and welding to the bent end portion of the plate member 14 can be used. An appropriate one may be selected and used in consideration of the purpose of use, the place of use, etc. of the inner joint of these various fixing methods.

As shown in FIG. 7, the push plate 12 has bolts 1
Zero insertion holes 12a are provided at appropriate intervals. In addition, screwing portions 12b are provided on one surface of the push plate 12 at appropriate intervals. In this embodiment, the threaded portion 12b is shown by welding the bulky bolt, but the invention is not limited to this, and the push plate 1 is not limited to this.
Any material that can be fastened to the push plate 12 by screwing a protective material 17, which will be described later, with a bolt 18 such as one in which the screw is directly screwed to 2 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 method of attaching the protective member 17, without using the members 12b and 18 shown in FIG. 7, with respect to a part of the bolt 10, the end portion of the bolt 10 on the side of the underdrain shaft is extended so that the protective member 17 is penetrated by a nut. The protective material 17 can also be tightened and attached.

A protective material 17 is provided in the space formed between the step portion 3 and the inner circumferential flexible water blocking member 7. The protection member 17 prevents the inner flexible water stop member 7 from bulging and deforming in the axial direction of the underdrain, 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 for this purpose, 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 inner peripheral surface of the push plate 12, the outer peripheral surface thereof abuts on the end surface portion 3b of the step portion 3, and the inner side surface of the protective material 17 is the constricted portion 7a of the inner peripheral flexible water blocking member 7. And is indirectly fixed to the anchoring member 4 by abutting on the side surface thereof. That is,
The protection member 17 is fixed to the pressing plate 12 by a bolt 18, and the pressing plate 12 is fixed to the anchoring member 4 indirectly by fixing the pressing plate 12 to the anchoring member 4 with a fastening bolt 10 and a nut 11. .

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 joints between the underdrain 1 and 1'in normal times.

The filling material 20 made of an elastic material is provided over substantially the entire space formed by the constricted portion 6a of the outer peripheral flexible water blocking member 6.
Are filled in a state in which pressure resistance is strengthened by compressing laterally or vertically. When the joint is opened and the earth and sand accompanied by earth pressure intrudes into the joint, the earth and sand load accompanied by the earth pressure directly acts on the filler 20. Therefore, as the filler 20, a material having strength and elastic repulsive force capable of following the expansion and contraction displacement of both the flexible water blocking members 6 and 7 and the load bearing member 9 while supporting the load thereof is selected. Foam rubber, cushion rubber,
Styrofoam and the like are particularly suitable. When a foamed elastic material is used as a joint material or a filler, a water-impermeable, closed-cell material may be used, but it is water-permeable and has open cells that do not shrink and deform even when water pressure acts. It is desirable to use the one with sex. In the case of a closed-cell elastic body, a material having a high hardness with a small amount of compression due to external pressure (external water pressure and earth pressure) is used (for example, high quality sponge, styrofoam, etc.). Further, in the case of a water-permeable elastic body, an open-cell material that does not shrink and deform even when water pressure acts and has hardness that prevents earth pressure from entering earth is used. In the case of this embodiment, the joint material and the filler are shown as separate bodies, but it goes without saying that they may be the same body.

FIG. 8 is a sectional view showing another embodiment of the joint according to the present invention. In the embodiments shown in FIG. 8 and subsequent figures, 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 embodiment shown in FIG.
Only the main parts of the joint are indicated by reference numerals, and the details are omitted. The embodiment of FIG. 8 is symmetrical with respect to the center line X, and the illustration on the right side is omitted.

In the embodiment shown in FIG. 8, a cylindrical frame 24 is fixed to the step portion 3. The frame body 24 is made of iron or resin, and has an outer peripheral flange portion 24a fixed to the step portion,
It is provided with an end surface portion 24b extending from the outer peripheral side flange portion 24a toward the axis of the underdrain 1 and a rising portion 24c protruding outward from the outer peripheral flange portion 24a.

In this embodiment, the anchoring portion 9b of the proof member 9 is formed in a plate shape, and a through hole 9f is formed in the protruding end portion thereof, and the through hole 9f is bent in a U shape. The end of the rod-shaped curved portion 9a is inserted so that its threaded tip faces the inner peripheral side, and the tip thereof is the nut 16
It is fixed at.

In this embodiment, both flexible water blocking members 6,
7 and the bearing member 9 are fixed, the anchoring flange portion 6b of the outer peripheral flexible waterproof member 6 is provided between the inner peripheral surface of the outer peripheral flange portion 24a of the frame body 24 and the anchoring portion 9b of the bearing member 9. The primary nut 11-1 is screwed and tightened on the bolt 10 penetrating these members.
A strong tightening is realized by sequentially stacking the anchoring flange portion 7b and the pressing plate 12 and fixing the secondary nut 11-2 to the through bolt 10 by two steps.

Further, in this embodiment, the outer end edge 6d of the outer peripheral flexible water blocking member 6 terminates on the inner side as compared with the embodiment of FIG. 1, and the outer end edge 9c of the proof member is the end face of the frame body 24. Part 24
It has been extended to b. An annular rigid body 50 made of steel, hard resin, or the like is disposed between the outer edge 6d of the flexible water blocking member 6 and the end surface portion 24b of the frame body 24.

In the rigid body 50, the fixing portion of the flexible water blocking member is locally compressed by the large force acting on the fixing portion of the strength member in the fixing portion of the joint subjected to the earth pressure, and the compression force causes a lapse of time. It is installed in order to avoid harmful deformation such as a creep phenomenon that occurs, and to prevent the water-stopping property and fixing property of the fixing portion from being impaired, and to install the bolt 10 and the primary nut 11-1. Together, they are effective.

When the joint receives an external pressure such as earth pressure, the external pressure is applied to the filler 20 and the constricted portion 6 of the outer circumferential flexible water blocking member 6.
is transmitted to the curved portion 9a of the proof member 9 through a, and the fixing portion 9
The load is supported by the protruding end 9f of b. When the protruding end 9f of the fixing portion 9b receives a heavy load, the fixing portion 9 of the proof member 9
When the vicinity of the central portion of b is simply supported and fixed by the bolt 10, the nut 11-1, etc., the fixing portion 9b tries to rotate around the penetration portion of the bolt 10 due to the load. Therefore, the fixing flange 6 of the outer circumference flexible water blocking member 6
fixing flange 7b of the outer peripheral portion of b and the inner peripheral flexible water blocking member 7
The vicinity of the base of the curved portion 7a and the curved portion 7a is extremely compressed, which causes plastic deformation (creep phenomenon) or the like due to long-term use and makes the fixing portion unstable, resulting in deterioration of the fixing degree and water leakage. . In order to prevent this, the rigid body 50 is provided, and the position where this rigid body 50 exists and the mounting position of the primary nut 11-1 mounted on the bolt 10 are used as the fulcrum of the plate-shaped fixing portion 9b from the curved portion 9a. Flange portions 6b and 7b of the flexible water blocking member supporting the transmitted load.
It is intended to avoid or reduce the load that acts on 6b and 7b to suppress the local compressive displacement.

By this method, it is possible to provide a joint having higher pressure resistance and improved water-stopping property and fixing property.

The rigid body 50 is the frame 24 or the fixing portion 9
It may be integrally welded to b or may be inserted as a separate body.

FIG. 9 is a sectional view showing another embodiment of the joint according to the present invention. In this embodiment, the load bearing member 2
1 is a bar-shaped member 13 and a plate-shaped member 1 in the embodiment of FIG.
4 (FIGS. 3 and 4), as shown in the perspective view of FIG. 10 (a), the curved portion 21a is made of a strip-shaped steel plate having a U-shaped cross section, and the anchor portion 21b is the curved portion. The plate-shaped member is integrally formed with the member forming the. When the load bearing member 21 is integrally formed in this way, the load bearing member 21 can be easily manufactured by bending the steel sheet, and therefore the working and the assembly of the joint are easy. Reference numeral 21c in FIG. 10 is a through hole for inserting the bolt 10.

As a modification of the embodiment of FIG. 9, FIG.
As shown in (b) and (c), the curved portion 2 of the load bearing member 21.
1a is formed from a strip-shaped steel plate having a U-shaped cross section, and an anchor portion 21b
May be formed from a plate-shaped member separate from this, and these two members may be fixed to each other by bolting, welding or the like.

In each of the embodiments shown in FIGS. 1 and 9, the outer edge of the anchoring portion of the load bearing member is present inside the outer edge of both flexible water blocking members. It is effective and preferable for preventing corrosion of the anchored portion of the load-bearing member, but when such corrosion of the anchored portion does not pose a problem, the outer edge of the anchored portion is not always flexible. It does not have to exist inside the outer edge of the water blocking member, and as shown in FIG. 8, for example, the outer edge 9c of the load resisting member 9 extends beyond the outer edge 6d of the flexible water blocking member 6. May be.

Further, the constricted portions of the outer circumferential flexible water blocking member 6, the inner circumferential flexible water blocking member 7 and the proof member 9 are not limited to those having a U-shaped cross section as shown in the above-mentioned embodiments, and joints may be used. In the case of displacement, in order to improve the displacement followability of the flexible water blocking member and reduce the displacement resistance of the joint anchoring portion, for example, two M-shaped cross-sections may be provided that bulge inward. However, an arbitrary shape such as a bellows shape having three or more bulging portions can be selected.

Further, the joint portion other than the essential constituent elements of the present invention can be modified in various ways other than those described in the above embodiments. For example, regarding the frame 24,
In addition to what is shown in FIG. 8, a part of the protective material 17 may cover the inner peripheral side end surface of the frame body 24. With this configuration, the end surface on the inner peripheral side of the frame body 24 is not directly exposed to the high-humidity atmosphere in the underdrain, and the durability of the joint can be improved. A configuration in which 24b and 24c in FIG. 8 are removed is also possible.

Further, instead of assembling and constructing the entire joint by on-site construction, it is possible to make the frame body 4 unnecessary by assembling the underdrain 1, 1 into one unit at the factory.

In each of the above embodiments, the protective material 17
However, it goes without saying that the present invention can be applied to a joint that does not use a protective material.

FIG. 11 is a sectional view showing a modification of the embodiment shown in FIG. In this embodiment, the vertical portion 35a of the anchor member 35 having an L-shaped cross section is arranged so as to be interposed between the outer end edge 6d of the outer peripheral flexible water blocking member 6 and the end face of the step portion 3. The function of the vertical portion 35a is the same as that of the rigid body 50 in the embodiment of FIG.

FIG. 12 is a sectional view showing a modification of the embodiment shown in FIG. In this embodiment, the vertical portion 9d of the anchoring portion 9b of the load-bearing member having an L-shaped cross-section has the outer periphery flexible water blocking member 6.
It is arranged so as to be interposed between the outer edge 6d and the end face of the step portion 3. The function of this vertical portion 9d is the same as that of the rigid body 50 in the embodiment of FIG. When the vertical portion 35a of FIG. 11 and the vertical portion 9d of FIG. 12 are arranged, it is more effective to fix the two portions as shown in FIG. 8 when fixing.

FIG. 13 schematically shows the behavior of the flexible water blocking member, the load bearing member, and related members when the joint receives the earthquake motion and continuously expands and contracts in the horizontal direction in the embodiment of FIG. This is to explain that even if the joint is subjected to an earthquake motion and intrusion of sediment occurs at the joint, there is no harmful intrusion of sediment into the constricted part of the flexible member, and the seismic motion can be absorbed without hindrance.

In FIG. 13 (a), the joint in the state shown in FIG. 1 is stretched and displaced, the joint between the two underdrains 1, 1 is opened, and the sand 4
0 indicates the state of the flexible water blocking member and the proof member immediately before the occurrence of the earthquake motion invading the joint.

FIG. 13B shows a state in which the joint is compressed and displaced by the seismic motion occurring in the state of FIG. 13A, the filler 20 is compressed and contracted, and the joint follows the compressive displacement. Is.

Next, FIG. 13 (c) shows a state in which seismic motion accompanied by extensional displacement acts on FIG. 13 (b). In this case, the joint between the culverts 1 and 1 is shown in FIG.
Opening from the state of, the invading earth and sand increases to 40, and the constricted part of the flexible water blocking member and the curved part of the load bearing member are deformed to the state in which the upper part is opened due to the extension displacement of the joint,
The filler 20 that has been appropriately compressed and mounted in advance deforms following the open shape of the constriction due to the repulsive force and the shape restoring force, which prevents harmful sand and sand from entering the constriction. . Furthermore, the shape change that pulls up the bottom of the constricted portion caused by the extensional displacement of the joint compresses the filler 20, and its repulsive force acts so as to prevent the intrusion of sediment into the constricted portion.

As described above, by mounting the compressed filling material 20 on the constricted portion of the flexible water blocking member, it is possible to absorb the earthquake motion that repeatedly expands and contracts without any trouble, and it is a highly safe earthquake resistant joint.

In each of the above embodiments, an example in which the joint of the underground construction is applied to the connection of the underdrain made of concrete is shown. However, the joint of the underground construction is not limited to the underdrain made of concrete, and the underground construction made of other materials is used. It may be applied to the construct.

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 may be constructed by assembling divided members. Further, this joint can be applied not only to an underground structure constructed by an open cutting method, but also to an underground structure constructed by a non-open cutting method such as a shield construction method.

[0063]

As is apparent from the above description, according to the present invention, the outer flexible water stop member and the narrowed portion of the inner flexible water stop member are formed over the inner peripheral surface of the end of the underground structure. It is arranged so as to bulge to the inner circumference side and is arranged between both flexible water blocking members so that the curved portion of the load bearing member extends to the inner circumference side. Even if the joint is opened and the earth and sand enter 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 tensile strength of the inner peripheral side strength-resistant member. Can withstand earth pressure. Therefore, by appropriately setting the strength of the load bearing member, 3 kg /
It can cope with a large earth pressure of cm ² or more.

Further, according to the present invention, since the curved portions of the rod-shaped or strip-shaped load bearing members arranged in parallel are arranged in the inner peripheral direction, a large amount of step displacement of the joint portion and displacement in all directions such as expansion and contraction displacement are small displacements. It can be easily absorbed by resistance.

Even if the joints between the underground structures are opened by the earthquake motion and the earth and sand enter the joints, there is no invasion of the earth and sand into the constricted part because of the filler attached to the constricted part of the outer flexible water blocking member. , It is possible to absorb the expansion and contraction of the joint due to the earthquake without any hindrance, and even if a large earth pressure is applied to the joint due to the earthquake motion, the load acting on the outer flexible water blocking member via the filler is applied to the inner peripheral side. It is possible to withstand a large earth pressure and water pressure by being supported by the tensile strength of the curved portion connected to the fixing portion of a certain strength member. The magnitude of this supporting force can be freely set by appropriately selecting the diameter and spacing of the load bearing members.

Further, since the load-bearing member serving as a load-bearing mechanism is completely surrounded by the inner and outer flexible water blocking members, and the gap between both flexible water blocking members is extremely narrow, the oxygen supply is cut off. Even if a steel material is used, since this load bearing member is configured to be isolated from the corrosive environment inside and outside the underdrain, it is a corrosion resistant and extremely durable joint.

Even when the joint undergoes a large elongation displacement due to ground movement or uneven subsidence due to an earthquake, the outer circumference flexible waterproof member is pressed by the earth and sand, and the curved proof member is pressed against the proof member. It can be freely stretched to the extent that it can be stretched (ie until the load bearing member is straight). As the displacement progresses, the bearing ring becomes a straight line, but the bearing ring and bearing plate exert a stopper function to prevent the joint from being damaged by excessive displacement. Therefore, by setting the dimensions of the bulging portion of the flexible water blocking member and the curved portion of the proof member in accordance with the required amount of extensional displacement, large extensional displacement can be sufficiently accommodated.

Further, the load bearing member is fixed to the inner peripheral surface of the end of the underground structure or the inner peripheral surface of the step portion, and since the load bearing member itself is deformed and expanded according to the expansion and contraction of the joint between the underground structures, There is no need for an anchor box to accommodate the end of the load-bearing member, and the structure of the entire joint can be simplified compared to a joint that uses a conventional load-bearing member, and the labor for mounting the joint can be saved. The manufacturing cost can be reduced.

Furthermore, the vicinity of the central portion of the fixing portion of the joint member is tightened in two steps by using bolts and nuts to form a supporting and fixing portion, and a rigid body portion is provided on the outer edge of the outer peripheral flexible member so that both portions serve as fulcrums. Since the load acting on the member can be supported and the load on the fixing flange of the flexible member can be reduced or released, plastic deformation (creep phenomenon) of the fixing flange portion due to the load can be avoided, and fixing can be achieved for long-term use. It is possible to provide reliable fixing while maintaining a high level of waterproofness of the part, and to provide a joint with high pressure resistance and high watertightness.

Further, according to the present invention, when a large earth pressure is applied to the outer circumferential flexible water blocking member, the earth pressure is supported by the proof member, and the way of supporting the proof member utilizes the cross-section tensile strength of the proof member. Therefore, the cross-section of the load-bearing member can be significantly reduced as compared with the case of utilizing the cross-section rigidity, so that the material cost can be saved and the manufacturing cost can be reduced.

Further, by mounting the filler made of an elastic material on the constricted part of the flexible member, even if the joint is opened and the sand and sand enter the joint, the mounted filler causes the sand and sand to enter the constricted part. However, it overcomes the problem that the displacement following ability is hindered due to the intrusion of sediment and the allowable displacement of the joint decreases.

Other operational effects of the present invention will be apparent from the description in the above-mentioned section "Means and operations for solving problems".

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a joint for an underground structure according to the present invention.

FIG. 2 is a perspective view of an underdrain to which a joint of an underground structure of the invention is applied.

FIG. 3 is a partial perspective view showing an example of a load bearing member.

FIG. 4 is a partial perspective view showing another example of a load bearing member.

FIG. 5 is a diagram showing a method of fixing a rod-shaped member that constitutes a load bearing member to a plate-shaped member.

FIG. 6 is a diagram showing another method of fixing the rod-shaped member that constitutes the load bearing member to the plate-shaped member.

FIG. 7 is a perspective view of a push plate.

FIG. 8 is a sectional view showing another embodiment of the joint for the underground structure according to the present invention.

FIG. 9 is a cross-sectional view showing another embodiment of the joint for the underground structure according to the present invention.

10 is a perspective view of a load bearing member used in the embodiment of FIG. 9. FIG.

FIG. 11 is a sectional view showing another embodiment of the joint of the present invention.

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

FIG. 13 is a schematic diagram showing the operation of the joint of the underground structure according to the present invention when horizontal seismic motion is applied.

FIG. 14 is a cross-sectional view showing an example of a conventional underdrain joint.

FIG. 15 is a cross-sectional view showing another example of a conventional underdrain joint.

[Explanation of symbols]

 1, 1 ′ Underdrain 2 Joint 3 Step 6 Outer peripheral flexible water stop member 6a Constriction 6b Anchoring flange 7 Inner peripheral flexible water stop 7a Constriction 7b Anchoring flange 9 Bearing member 9a Curved anchor 9b Department

Claims (8)

[Claims] 1. A short cylindrical shape made of an elastic material such as rubber or synthetic resin, straddling a step formed on the inner peripheral surface of the end of a pair of opposed underground structures, While fixing the outer circumference flexible water blocking member and the inner circumference flexible water blocking member having an annular constriction portion bulging to the peripheral side and anchoring flange portions extending from both sides of the constriction portion at each anchoring flange portion, Between the outer circumferential flexible water blocking member and the inner circumferential flexible water blocking member, a yield strength member having a curved portion and anchor portions extending from both sides of the curved portion is formed so that the curved portion projects toward the inner peripheral side. A joint for an underground structure, characterized in that the joint is attached to the stepped portion at the anchoring portion. 2. The joint for an underground structure according to claim 1, wherein the space formed by the constricted portion of the outer peripheral flexible water blocking member is filled with a filler made of an elastic body. 3. The bending portion of the load-bearing member is composed of a plurality of curved rod-shaped members arranged at appropriate intervals in the circumferential direction of the joint, and the anchoring portion has the rod-shaped members fixed at both ends thereof. It consists of a plate-shaped member, The joint of the underground structure in any one of Claims 1-2. 4. The load-bearing member comprises a belt-shaped plate having a U-shaped cross section at the curved portion, and the anchoring portion is made of a plate-shaped member having the belt-shaped plates forming the curved portion fixed at both ends thereof. The joint for an underground structure according to any one of claims 1 to 2, characterized in that. 5. The load-bearing member, wherein the curved portion is a strip-shaped plate having a U-shaped cross section, and the anchoring portion is a plate-shaped member integrally formed with the strip-shaped plate forming the curved portion. The joint for an underground structure according to any one of claims 1 and 2, which is characterized. 6. An anchoring portion of the load bearing member 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 for an underground structure according to any one of claims 1 to 5, wherein an outer edge of the anchoring portion is present inside at least one outer edge of both of the flexible water blocking members. 7. An annular rigid body is arranged between the outer edge of the anchoring flange portion of the outer peripheral flexible water blocking member and the step portion with or without a frame body. The joint for an underground structure according to any one of 1 to 5. 8. An anchoring portion of the load bearing member is disposed 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. The first nut screwed to the bolt penetrating the member tightens the anchoring portion of the load-bearing member to the anchoring flange portion of the outer circumferential flexible waterproof member, and the second nut screwing to the bolt The joint for underground construction according to any one of claims 1 to 7, wherein the anchoring flange portion of the inner circumference flexible water blocking member is tightened to the anchoring portion of the load bearing member.