JP2854562B2 - Inner smooth flexible joint for culvert - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
The present invention relates to a flexible joint for a culvert such as a cave.

[0002]

2. Description of the Related Art As shown in a sectional view of FIG. 12, a conventionally used joint has a step on a circumferential surface of a pair of rectangular culverts a and a 'facing each other. Part b,
b ', and the both ends d and d' of a short tubular flexible water-stopping member e which is made of a flexible member such as rubber or synthetic resin and has a constricted portion c bulging inward at the center. There is a type which is mounted on the peripheral surfaces of the steps b and b 'in a watertight manner to absorb the relative displacement of the culvert accompanied by uneven settlement of the ground and to stop water between these culverts. . Here, k is a joint material.

As a joint of the same type, there is a joint described in Japanese Patent Publication No. 63-58982 proposed by the present applicant. As shown in the cross-sectional view of FIG.
A pair of opposed culverts a and a 'are formed in a short cylindrical shape made of an elastic material such as rubber or synthetic resin over a stepped portion b or b' formed on an inner peripheral surface of an end portion of the end. And at the center, an annular constriction c bulging inwardly, and the constriction c
A flexible water blocking member e having anchoring flanges d, d 'extending from both sides of the anchoring flanges d, d',
Protective members f and f 'for preventing the flexible water-stopping member e from bulging in the axial direction are provided in a space formed between the step portions b and b' and the flexible water-stopping member e. It is arranged. Here, g and g 'are frames having flanges h, h', i and i 'and end faces j and j', and k is a joint material.

[0004]

The joint shown in FIG. 12 has a structure in which the joint is recessed into the steps b and b 'with respect to the inner peripheral surface 1 of the culvert. There is an inconvenience that objects, earth and sand, etc., accumulate in the steps b, b ', and that the foot of the common groove or the like deteriorates during traffic during maintenance and inspection. In addition, when elongation or uneven settlement occurs between the culverts a and a ', the dents and steps between the culverts a and a' further increase,
The above inconveniences increase.

[0005] In the joint shown in FIG. 13, the inner circumferential surface of the culvert is formed substantially flush with the inner circumferential surface of the culvert by the protective members f and f ′ arranged at the steps b and b ′ in normal times. Although the above-mentioned inconvenience can be prevented in the joint 12, it is unavoidable that a dent or a step occurs when the culverts a and a ′ elongate or unequally subside.

[0006] Other than the above, as a joint of a culvert having an inner surface smoothing function, Japanese Patent Publication No. 49-31484 and Japanese Utility Model Publication No.
There are various joints described in Japanese Patent Publication No. 31780, Japanese Patent Publication No. 55-37673, and Japanese Patent Publication No. 62-23134, and the joints described in Japanese Patent Publication No. 49-31484 are flexible water shutoff by external water pressure. The joint described in Japanese Utility Model Publication No. 49-31780 has a defect that the member swells to the inner peripheral side. The joint is smooth at the initial stage of installation, but avoids dents and steps when elongation or uneven settlement occurs between the culverts. Not be able to speak
The joints described in JP-B-37-73 and JP-B-62-23134 have a problem that the structure is complicated, the installation is troublesome, and the cost is high.

The present invention has been made in view of the above-mentioned problems of the conventional culvert joints. The present invention relates to a case where the inner surface of the culvert is smooth at the time of installation, and the culvert is stretched or unevenly settled between the culverts. However, an object of the present invention is to provide an inner surface smooth flexible joint for a culvert which can prevent dents and steps from occurring between the culverts, has a simple structure, and is easy to mount.

[0008]

According to a first aspect of the present invention, there is provided a culvert inner smooth flexible joint according to the present invention, wherein a step formed on an inner peripheral surface of an end portion of a pair of opposed culverts. A flat portion formed of a flexible material such as rubber or synthetic resin, and extending in the center of the joint in the axial direction, and a flat portion extending in the joint axial direction from both ends of the flat portion to the outer peripheral side. A flexible water blocking member having a bulging bulging portion and anchoring flange portions extending from both sides of the bulging portion is fixed at the anchoring flange portion, and an inner peripheral surface of the flat portion of the flexible water stopping member is fixed. A pair of abutting plates extending in substantially the same plane as the inner peripheral surface of the culvert in contact with a part thereof are fixed to each culvert, and a pair of flat plates of the flexible water blocking member are supported on the outer peripheral surface. The support plate is fixed to each culvert.

In the joint according to the present invention, the height of the flexible water blocking member from the outer peripheral surface of the anchoring flange portion to the outer peripheral surface of the flat portion may be from the center of the flat portion to the bulging portion. Is formed to be larger than the width up to the inner surface in the axial direction of the joint.

In the joint according to the third aspect, the flexible water blocking member and the corresponding plate are anchored to each culvert via a frame, and the support plate is formed integrally with the frame. It is characterized by the following.

In the joint according to the fourth aspect, the flexible water blocking member is anchored to the culvert via an anchoring plate provided on the inner peripheral surface of the anchoring flange. The plate is fixed to the anchoring plate via a connecting plate formed integrally and continuously with the joint axially outer end.

[0012]

According to the first aspect of the present invention, the pair of abutment plates contact a part of the inner peripheral surface of the flat portion of the flexible water blocking member and extend substantially flush with the inner peripheral surface of the culvert. In addition, since the flat portion of the flexible water blocking member is supported on the outer peripheral surface thereof by a pair of support plates, a joint having a smooth inner surface substantially flush with the inner peripheral surface of the culvert when the joint is installed. It is formed.
In addition, when an extension displacement occurs between culverts, that is, when a displacement occurs in a direction in which joints between adjacent culverts expand,
The bulging portion of the flexible water-stopping member, which is held between the support plate and the support plate, can follow the extension displacement between the culverts by linearly extending the bulging portion. Therefore, the inner peripheral surface of the flexible water blocking member can maintain a flat surface, and can maintain a substantially same smooth surface as the inner peripheral surface of the culvert.

Further, even when uneven settlement occurs in the culvert, the inner peripheral surface of the flexible water blocking member maintains a flat surface, and the two culverts are connected by the slope-shaped inner peripheral surface of the flexible water blocking member. Therefore, there is no sudden step difference unlike the conventional joint.

According to the second aspect of the present invention, the height of the outer peripheral surface of the flat portion from the outer peripheral surface of the anchoring flange portion of the flexible water blocking member is from the center of the flat portion to the inner surface of the bulging portion in the joint axial direction. Is formed so as to be larger than the width of the flexible water blocking member. By preventing the flat portion from bulging toward the outer periphery due to the force for swelling toward the inner periphery, it is possible to contribute to maintaining a smooth inner surface.

According to the third aspect of the present invention, the flexible water blocking member and the abutment plate are anchored to each culvert via the frame, and the support plate is formed integrally with the frame. The components can be assembled in advance in a factory to form a joint assembly, and the joint can be constructed by transporting the joint assembly to a construction site and casting concrete, thereby facilitating construction.

According to the fourth aspect of the present invention, the plate is fixed to the anchoring plate disposed on the inner peripheral surface of the anchoring portion of the flexible water blocking member via the integrally formed connecting plate. As a result, the exposed portion of the plate in the culvert which may be corroded can be minimized.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 to 9 show an embodiment in which the present invention is applied to a box culvert. FIG.
Fig. 2 is a perspective view of a box culvert, Fig. 3 and Fig. 4 are partial cross-sectional views showing each step of installing a joint, and Fig. 5 is a section extending between opposed culverts. FIG. 6 is a cross-sectional view showing a state of the joint when a displacement occurs, and FIG. 6 is a cross-sectional view showing a state of the joint when a displacement and unequal settlement are caused to extend between opposed culverts.

In FIG. 2, reference numeral 1 denotes a culvert joint according to the present invention, and reference numerals 2 and 2 'denote culverts composed of box culverts. Opposite ends of the pair of culverts 2, 2 'are connected by a joint 1 according to the present invention.

The joint 1 of the culvert, as shown in FIG.
A stepped portion 3 is provided on the inner edge of the culvert 2, 2 '.
3 'is formed. Reference numeral 21 indicates the culvert 2, 2 '.
Fig. 4 shows a filler made of an elastic material such as sponge rubber or the like filled in joints between them.

A flexible water-stopping member 4 formed in a short cylindrical shape made of an elastic material such as rubber or synthetic resin over the step portions 3 and 3 '.
Are arranged. In a state at the time of installation, the flexible water blocking member 4 has a flat portion 4a extending to the center in the axial direction of the joint, a bulging portion 4b bulging in the joint axial direction from both ends of the flat portion 4a on the outer peripheral side, and a bulging portion. It has an anchoring flange portion 4c extending outward from both sides of the portion 4b in the joint axial direction.
Anchors 5 and 5 'are embedded in outer peripheries 3a and 3a' of steps 3 and 3 'of culverts 2 and 2'.
Are anchoring bolt insertion holes 6a, 6a 'drilled in anchoring plates 6, 6' disposed on the inner peripheral surface of anchoring flange 4c, and anchors drilled in anchoring flange 4c. Cap nuts 5 at the heads of the anchors 5 and 5 'inserted into the attachment bolt insertion holes 4d
The anchors 5 and 5 'are anchored to the anchors 5 and 5' by anchoring bolts 7 and 7 '.

It is preferable that the material of the flexible water blocking member 4 has sufficient flexibility and strength. Flexible water blocking member 4
The reinforcing cloth 8 may be embedded as shown in the right side of FIG. 8 in order to enhance the strength.

Also, as shown in FIG.
2 extending in the circumferential direction on the outer peripheral surface of the anchoring flange portion 4c.
A water stopping ridge 4e is formed.

Referring to FIG. 8, the outer peripheral surface 4f of the flat portion 4a extends from the outer peripheral surface 4f of the anchoring flange portion 4c of the flexible water blocking member 4.
g from the center 4h of the flat portion 4a to the bulging portion 4
In order to prevent the flat portion 4a from bulging to the inner peripheral side, it is preferable that the flat portion 4a is formed to be larger than the width W to the joint axial direction inner side surface 4i.

The circumferentially extending contact plates 9 and 9 ′ made of a pair of steel plates are in contact with the inner peripheral surface 4 j of the flat portion 4 a of the flexible water blocking member 4 and the inner peripheral surfaces 2 a of the culverts 2 and 2 ′. , 2a 'are arranged to extend substantially on the same plane. On the anchoring plate 6 for the flexible water blocking member 4, there are provided rods 10, 10 'for fixing the plate.
Are welded, and cap nuts 11, 11 'are welded to the ends of the bars 10, 10'. On the other hand, this plate 9,
Attachment plates 12 and 12 'are welded to the outer peripheral surface of 9'. The attachment plates 12 and 12 'are placed on cap nuts 11 and 11', and as shown in FIG. 9, 9 'and bolt insertion holes 13, 1 formed in the mounting bags 12, 12'.
The mounting plates 12, 12 'are fixed to the cap nuts 11, 11' by hexagonal hole bolts 14, 14 'inserted through 3' and screwed to the cap nuts 11, 11 '.

On the outer peripheral side of the flat portion 4a of the flexible water blocking member 4, the oblique direction from the center of the outer peripheral portions 3a, 3a 'of the steps 3, 3' of the culverts 2, 2 'obliquely outwards in the joint axial direction. Rising portions 15a, 15a 'and anchoring flange portions 15 extending outward from the bases of the rising portions 15a, 15a' in the joint axial direction.
b, 15b 'and supporting plates 15, 1 extending in the circumferential direction
5 'is provided so as to support the flat portion 4a of the flexible water blocking member 4 on the outer peripheral surface. These support plates 15,
Numeral 15 'denotes cap nuts 16a, 16a' of anchors 16, 16 'buried in stepped outer peripheral portions 3a, 3a' of culverts 2, 2 'at anchoring flange portions 15b, 15b'.
Are attached to the culverts 2 and 2 'by bolts 18 and 18' which are screwed into the culverts 2 and 2 '. The tips of the support plates 15 and 15 ′ are rounded so as not to damage the flexible water blocking member 4.

The supporting plates 9, 9 'and the supporting plates 15, 15'
And the like extend in the circumferential direction and are formed in an annular shape as a whole, but are preferably formed as members that are divided into a plurality of portions in the circumferential direction for convenience of transportation and construction.

Next, a method for installing the joint of this embodiment will be described with reference to the partial sectional views of FIGS.

In the culverts 2, 2 ', anchors 5, 5' and 16, 16 'are set in advance in the formwork at the time of concrete casting, and after the concrete is cast, the die is removed, as shown in FIG. 3 (a). Anchors 5, 5 'and 16, 1
Reference numeral 6 'denotes outer peripheral portions 3a, 3' of steps 3, 3 'of culverts 2, 2'.
It remains buried in a '.

Next, as shown in FIG.
5 and 15 'are attached to anchors 16 and 16' by bolts 18 and 1
After the attachment at 8 ', the anchoring plates 6, 6' with the rods 10, 10 'welded thereon are mounted on the inner peripheral surface of the anchoring flange 4c of the flexible water blocking member 4, as shown in FIG. And the flexible water blocking member 4 is anchored by the bolts 7 and 7 ′ through the anchoring plate 6.
Attach to 5 '. Next, the contact plates 9, 9 'are attached to the mounting plates 12, 1
The joint shown in FIG. 1 is completed by attaching to the cap nuts 11 and 11 'via 2'.

Next, the operation of the joint having the above configuration will be described. At the time of installation of the joint and in a normal state where displacement such as extension displacement does not occur between the culverts, the joint 1 is in the state shown in FIG. 1 and the inner surface of the flexible water blocking member 4 is The flat portion 4a is in contact with the outer peripheral surface and is supported by the distal ends of the support plates 15, 15'a, and the flatness of the flat portion 4a is maintained while being held by the abutment plates 9, 9 'and the support plates 15, 15'. ing. The flat plates 4a of the flexible water-stopping member 4 form the flat inner surfaces 2a, 2'a of the culverts 2, 2 '.

In the case where an extension displacement occurs between the culverts 2 and 2 ', as shown in FIG.
a is held between the contact plates 9, 9 'and the support plates 15, 15', the bulging portion 4b extends linearly, and the joint 1 maintains the flatness of the flat portion 4a.追 Follow extension displacement between culverts. At this time, the flat portion 4a is swelled inward by the external water pressure. However, the height from the outer peripheral surface 4f of the anchoring flange portion 4c of the flexible water blocking member 4 to the outer peripheral surface 4g of the flat portion 4a. Since H is formed so as to be larger than the width W from the center 4h of the flat portion 4a to the inner side surface 4i of the bulging portion 4b in the axial direction of the joint, the bulging portion 4b is swelled outward in the joint axial direction by external water pressure. Force F1
By preventing the flat portion 4a from expanding toward the outer periphery in response to the force F2 for expanding the flat portion 4a toward the inner peripheral side, it is possible to contribute to maintaining a smooth inner surface.

Even if uneven settlement occurs between the culverts 2 and 2 ', the flat portion 4a of the flexible water blocking member 4 can maintain the flatness as shown in FIG. ′ Are connected by the slope-shaped flat portion 4a, so that there is no sudden step difference unlike the conventional joint.

Also in the case where the extension displacement and the unequal settlement occur between the culverts 2 and 2 ', as shown in FIG. 7, the flexible water blocking member 4 has the bulging portion as in the case of the extension displacement. 4b follows the displacement between the culverts by extending linearly. Therefore, also in this case, the flat portion 4a of the flexible water blocking member 4 maintains the flatness, and the two culverts 2, 2 'are connected by the slope-shaped flat portion 4a of the flexible water blocking member 4. . Therefore, even in this case, the culvert 2,
A sharp step between 2 'is prevented.

FIG. 10 is a partial sectional view of another embodiment of the joint according to the present invention. In the embodiments shown in FIG. 10 and subsequent figures, the same components as those in the embodiment in FIG.

In the embodiment shown in FIG.
Numeral 0 has an annular frame 31, and the flexible water blocking member 4 and the abutment plate 9 are anchored to the culvert 2 via the frame 31.
The frame body 30 includes a horizontal portion 31a extending in the joint axial direction along the outer peripheral portion 3a of the step portion 3 of the culvert 2, and a rising portion 31b rising from the horizontal portion 31a at a right angle along the end face of the step portion 3. The inner end of the horizontal portion 31a in the joint axial direction is bent obliquely outward in the joint axial direction to form a support plate 32. In this embodiment, the flexible water blocking member 4 is previously attached to the cap nut 5a of the anchor by the bolt 7 via the frame 31 in the factory, and the plate 9 is bolted to the cap nut 11 welded to the anchor attachment plate 6. The joint is completed by mounting the joint assembly 14 and transporting the joint assembly to a construction site and casting concrete. In this embodiment, since all the components of the joint are assembled to the frame 31 at the factory, it is only necessary to arrange the frame at a predetermined position and cast concrete at the construction site, and the construction is simple. Further, since the support plate 32 can be formed integrally with the frame 31, it can be easily assembled even in a factory.

FIG. 11 shows still another embodiment of the joint according to the present invention. In the joint 40 of this embodiment,
The flexible water blocking member 4 is formed by a collar 43 through a collar 43 via an anchoring plate 6 disposed on the inner peripheral surface of the anchoring flange 4c.
Mounted on The connecting plate 42 is formed continuously and integrally at the outer end of the joint plate 42 in the axial direction of the joint so that the connecting plate 42 is bent at right angles. It is welded on the peripheral surface. A space between the connecting plate 42 and the end face of the step 3 is filled with a caulking material 44. In this configuration, the area of the exposed portion of the plate in the culvert which may be corroded can be minimized.

[0038]

As described above, according to the first aspect of the present invention, the pair of abutment plates contact a part of the inner peripheral surface of the flat portion of the flexible water blocking member and the inner peripheral surface of the culvert. And the flat portion of the flexible water blocking member is supported on its outer peripheral surface by a pair of support plates, so that it is substantially the same as the inner peripheral surface of the culvert when the joint is installed. A joint having a planar smooth inner surface is formed. In the case where the displacement occurs between the culverts, that is, when the joint between adjacent culverts expands, the flexible water blocking member is held between the support plate and the support plate. Thus, the bulging portion extends linearly, so that it can follow the extension displacement between the culverts. Therefore, the inner peripheral surface of the flexible water blocking member can maintain a flat surface, and can maintain a substantially same smooth surface as the inner peripheral surface of the culvert.

Further, even when uneven settlement occurs in the culvert, the inner peripheral surface of the flexible water blocking member is kept flat, and the two culverts are connected by the slope-shaped inner peripheral surface of the flexible water blocking member. Therefore, there is no sudden step difference unlike the conventional joint.

According to the second aspect of the present invention, the height of the outer peripheral surface of the flat portion from the outer peripheral surface of the anchoring flange portion of the flexible water blocking member is from the center of the flat portion to the inner surface of the bulging portion in the axial direction of the joint. Is formed so as to be larger than the width of the flexible water blocking member. By preventing the flat portion from bulging toward the outer periphery due to the force for swelling toward the inner periphery, it is possible to contribute to maintaining a smooth inner surface.

According to the third aspect of the present invention, the flexible water blocking member and the abutment plate are anchored to each of the culverts via the frame, and the support plate is formed integrally with the frame. The components can be assembled in advance in a factory to form a joint assembly, and the joint can be constructed by transporting the joint assembly to a construction site and casting concrete, thereby facilitating construction.

According to the fourth aspect of the present invention, the plate is fixed to the anchoring plate provided on the inner peripheral surface of the flexible water-stopping member anchoring portion via the integrally formed connecting plate. As a result, the exposed portion of the plate in the culvert which may be corroded can be minimized.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing one embodiment of an inner surface smooth joint for a culvert according to the present invention.

FIG. 2 is a perspective view of a box culvert to which the joint of FIG. 1 is applied.

FIG. 3 is a sectional view showing a construction procedure of the embodiment.

FIG. 4 is a sectional view showing a construction procedure of the embodiment.

FIG. 5 is a cross-sectional view showing a state at the time of elongation displacement of the joint of the embodiment.

FIG. 6 is a cross-sectional view showing the same embodiment at the time of uneven settlement.

FIG. 7 is a cross-sectional view showing a state of elongation and unequal settlement complex displacement of the joint of the embodiment.

FIG. 8 is a diagram showing details of a flexible water blocking member.

FIG. 9 is an enlarged sectional view showing the anchoring state of the plate.

FIG. 10 is a partial sectional view showing another embodiment of the joint of the present invention.

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

FIG. 12 is a partial sectional view showing an example of a conventional culvert joint.

FIG. 13 is a partial sectional view showing another example of a conventional culvert joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joint 2, 2 'Culvert 3, 3' Step part 4 Flexible water-stopping member 4a Flat buried part 4b Swelling part 4c Anchor flange 9, 9 'This plate 15, 15' Support plate

Claims (4)

(57) [Claims] 1. A short tubular member made of a flexible material such as rubber or synthetic resin is formed across a step formed on an inner peripheral surface of an end portion of a pair of opposed culverts, and has a central portion. A flexible water-stopping member having a flat portion extending in the joint axial direction, a bulge portion bulging in the joint axial direction on the outer peripheral side from both ends of the flat portion, and an anchoring flange portion extending from both sides of the bulge portion. Each of the culverts has a pair of abutment plates fixed at the anchoring flange portion and in contact with a portion of the inner peripheral surface of the flat portion of the flexible water blocking member and extending substantially flush with the inner peripheral surface of the culvert. And a pair of support plates for supporting the flat portion of the flexible water blocking member on the outer peripheral surface are fixed to each culvert. 2. The flexible water blocking member has a height from an outer peripheral surface of the anchoring flange portion to an outer peripheral surface of the flat portion from a center of the flat portion to an inner surface of the bulging portion in a joint axial direction. The inner surface smooth flexible joint for culverts according to claim 1, wherein the inner surface is formed to be larger than the width. 3. The flexible water blocking member and a corresponding plate are anchored to each culvert via a frame, and the support plate is formed integrally with the frame. Or the inner surface smooth flexible joint for culverts described in 2 or 3. 4. The flexible water blocking member is anchored to the culvert via an anchoring plate disposed on an inner peripheral surface of the anchoring flange portion, and the plate is attached to an outer end of the joint axial direction. The inner surface smooth flexible joint for culverts according to claim 1 or 2, wherein the joint is fixed to the anchoring plate via a connecting plate formed integrally with the part.