JPH03103598A - Flexible joint for closed conduit - Google Patents

Abstract

PURPOSE:To increase workability and cutting off effect of water even if a compressive or tensile displacement is caused in a closed conduit, by providing collars in exterial and interial cylinders respectively and interposing cutting off ring packings of water between the collars. CONSTITUTION:At least one piece of first collar 6 is formed as a unit at the inner peripheral face of an external cylinder 3 fitted at the end of one of cylinders in a closed conduit and at least two pieces of second collars 15, 16 are formed as a unit at the outer peripheral face of an internal cylinder 11 fitted at the end of the other cylinder. Next, water cutting off ring packings 20, 21 are interposed respectively in the space surrounded by the external and internal cylinders 3, 11 and the first and second collars 6, 15, 16. And when a compressive or tensile displacement is caused in the closed conduit, the clearance between the first collar 6 and one of the second collars 15, 16 becomes narrow and one of the interposed water cutting off packings 20, 21 is compressed to become effective in cutting off of water.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to flexible joints used in underdrains, such as flexible joints for shield segments and flexible joints for box culverts.

In culverts such as 1L underground drainage channels, each unit of the cylindrical structure (hereinafter referred to as a segment) is made of elastic flexible joints in order to absorb displacement of the culvert due to earthquakes or ground subsidence and prevent damage. are interconnected using

Conventionally, such a flexible joint as shown in FIG. 12 has been used.

The flexible joint 01 is made of a solid elastic member such as soft rubber or rubber containing reinforcing fibers and has a rectangular cross-sectional shape. Steel outer frame segments 02 each having a cylindrical shape and having a flange 02a facing inward are arranged on both sides of the flexible joint 01, and the flexible segment l- 03 is being constructed.

Flange portion 0 of the flexible joint 01 and outer frame segment l-02
2a is provided with a large number of holes 04 parallel to the center of the cylindrical body, a bolt l-05 is passed through the holes 04, and a nut 06 is inserted into the hole 04.
The flexible joint 01 and the outer frame segment }02 are tightened.

Standard segment 0 made of steel or concrete
7 has flanges 07a formed inward at both ends thereof, and the standard segment 07 is connected to the above-described flexible segment 03 by tightening bolts 08 and nuts 09, and the underdrain is connected to the flexible segment 03. has been done.

When constructing the underdrain, the flexible joint 01 is connected to the bolt 04.
The work is carried out by tightening the nut 05 to a compressed state of 40 to 60%, and then loosening the nut 05.

By compressing and arranging the flexible joint 01 in this manner, when displacement occurs in the underdrain, the restoring force of the flexible joint 01 is used to absorb the displacement.

As mentioned above, the displacement of the culvert was absorbed by using the restoring force due to the compression of the flexible joint 01, so during construction, the ratio of the flexible joint 01 was set at 40 to 60%. It had to be compressed, and the compression required considerable labor and time-consuming construction.

Also, if the culvert is suddenly displaced, the flexible joint 01 will be compressed.
cannot follow the displacement, and a gap is created between the flexible joint o1 and the outer frame segment 02, and at the same time as water flows into the gap, earth and sand flows into the gap, causing the flexible joint 01 and the outer frame segment 02 to flow into the gap. The water-stop performance between the two may deteriorate.

Further, the flexible joint 01 compressed to 40 to 60% suffered from creep, and even when no load was applied to the flexible joint 01, it did not return to its original state by 100%, resulting in a decrease in water-stopping properties.

The present invention relates to a flexible joint for an underdrain that overcomes such difficulties, and includes at least one piece on the inner circumferential surface of an outer cylindrical body attached to the end of one cylindrical body of the underdrain. A first flange is integrally formed, and the at least two second N parts are integrally formed on the outer peripheral surface of the inner cylinder attached to the end of the other cylindrical body of the underdrain, and the outer cylinder It is characterized in that a ring-shaped water-stop packing is interposed in each space surrounded by the body, the inner cylindrical body, the first flange, and the second flange.

In the present invention, when compressive displacement occurs in the underdrain, the gap between the first flange and the second flange becomes narrower, and the ring-shaped water stop packing interposed between the first flange and the second flange is compressed. It has a water-stopping effect.

In addition, when an elongation displacement occurs in the culvert, the distance between the other of the two second flanges and the first flanges becomes narrower, and the gap between the first flanges and the second flanges becomes narrower. Another ring-shaped water-stop packing interposed in the pipe is compressed and exerts a water-stop effect.

Further, the present invention provides that at least one first flange is integrally formed on the outer peripheral surface of the cylindrical body attached to the end of one cylindrical body of the underdrain, and the end of the other cylindrical body of the underdrain is The at least two second flanges are integrally formed on the inner peripheral surface of the outer cylinder attached to the outer cylinder, and are surrounded by the inner cylinder, the outer cylinder, the first collar, and the second collar. It is characterized in that a ring-shaped water-stop packing is interposed in each space, and the same effect as described above can be achieved.

An embodiment of the present invention illustrated in FIG. 1 and FIG. 5 will be described below.

FIG. 1 is a perspective view showing a state in which standard segments 1 made of steel or concrete in an underdrain are connected to each other by flexible segments 2.

The standard segment 1 is formed into a cylindrical shape by assembling a plurality of divided segments 1a.

The flexible segment 2 also includes an outer cylinder 3, an inner cylinder 11, ring-shaped water-stop packings 20 and 21, and a swelling rubber packing 22.
, a cover plate 23, and a presser plate 24.

The outer cylindrical body 3 is made up of a large number of divided cylindrical bodies 4, as shown in FIG. By moving the divided cylindrical body 4a from the inside to the outside when assembling the outer cylindrical body 3, the outer cylindrical body 3 can be moved inside the culvert. It is possible to assemble from both sides.

Further, a flange 6 is formed that extends inwardly from one end 5 of the outer cylinder 3 to the other end 8 with a predetermined distance therebetween.
Furthermore, a presser temporary support flange 7 is formed which projects further inward from the flange 6 toward the other end 8 at a predetermined distance.

An annular main beam 9 is welded to the other end 8 of the outer cylinder 3, and the main beam 9 is reinforced by a large number of vertical ribs 10 arranged circumferentially.

The inner cylindrical body 11 is composed of a large number of divided cylindrical bodies l, similar to the outer cylindrical body 3.
It is structured from 2 onwards.

The base 13 of the inner cylindrical body 11 has a cylindrical shape with the same diameter as the outer cylindrical body 3, and a locking portion 14 having a smaller diameter than the base 13 is formed on the distal end side of the base 13. 14 includes a flange portion 15 that sandwiches the flange portion 6 of the outer cylinder 3 toward the outside.
16 is formed and is adapted to fit into the outer cylinder body 3.

In addition, a large number of vertical ribs 1 are provided at the proximal end 17 of the cylindrical body 11.
The main girder 18 reinforced at 9 is welded.

Furthermore, the inner circumferential surface of the outer cylinder 3, the side surface of the flange 6, and the inner peripheral surface of the inner cylinder 1
A ring-shaped water-stop packing 2o having a circular cross-sectional shape and made of an elastic member such as rubber is interposed in a space A surrounded by the outer peripheral surface of the locking portion ■4 of l and the side surface of the flange portion 15. At the same time, the inner circumferential surface of the outer cylindrical body 3, the side surface of the collar 6, and the inner cylindrical body l1
A ring-shaped water-stop packing 21 having the same shape as the ring-shaped water-stop packing 20 is interposed in a space B surrounded by the outer peripheral surface of the locking portion 14 and the side surface of the collar portion 16 .

In addition, the inner surface of the end 5 of the outer cylinder 3 and the base work 3 of the inner cylinder l1
An annular swollen rubber packing 22 with an L-shaped cross section is interposed in a space surrounded by the outside of the swelling rubber packing 22 and the base 14a of the locking part 14, and the exposed outer surface of the swollen rubber packing 22 A cover plate 23 is integrally attached to the outer peripheral surface of the end portion 5 of the outer cylindrical body 3 so as to cover the outer cylindrical body 3.

Furthermore, a presser temporary 24 is applied to the inside of the locking portion 14, and the presser plate 24 is attached to the presser plate supporting crocodile portion 7 of the outer cylinder body 3 with bolts 24.
5 and a nut 26.

Since the first embodiment of the present invention is configured as described above, when displacement in the compression direction occurs in the underdrain, the outer cylindrical body 3 and the inner cylindrical body 11 come close to each other as shown in FIG. 6 and tsuba 16
The interval between the ring-shaped water-stop packing 21 and the flange 6 becomes narrower.
and is compressed by the flange 16 to increase water-stopping properties.

Furthermore, when displacement occurs in the elongation direction of the culvert, the outer cylinder 3 and the inner cylinder l1 separate as shown in FIG. One of the ring-shaped water-stop packings 20 is compressed and exhibits water-stop properties.

In the embodiments shown in FIGS. 1 to 5, ring-shaped waterproof packings 20 and 21 having circular cross-sections were used, but ring-shaped water-stop packings 20 and 21 having circular cross-sections were used. Ring-shaped water stop packing 30, 31. 32 may be used.

Furthermore, as shown in FIG. 9, a ring-shaped waterproof packing 33 is formed inside the elastic body, or a core material 35 formed of another material is placed inside the elastic body 34 as shown in FIG. A ring-shaped water stop packing 36 may be used.

Furthermore, in the embodiment shown in FIGS. 1 and 5, the outer cylinder 3
A flange 6 is provided on the inner surface of the flange 6 toward the inside thereof,
Two flanges 15. 16 were established,
As shown in FIG. 11, a flange 41 is provided on the outer surface of the inner cylindrical body 4o, and a flange 41 is provided on the inner surface of the outer cylindrical body 42 so as to sandwich the flange 4l inward. Two pieces of collar part 43. A similar effect can be obtained by using a flexible joint provided with 44.

As explained above, in the present invention, two ring-shaped waterproof packings are interposed between the flange formed on the outer cylinder and the flange formed on the inner cylinder. By using a flexible joint, there is no need to compress the ring-shaped water-stop packing during construction, improving workability.

In addition, different ring-shaped water-stop packings are compressed and act on the compressive and elongated displacements of the underdrain, so they have good followability, so earth and sand will not flow into the flexible joint.
In addition, since the ring-shaped water-stop packing is not compressed to a large extent, creep phenomenon does not occur, and it has good water-stop performance against compression displacement and extensional displacement, and has overall water-stop performance. will improve.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of the present invention, Fig. 2 is a view taken along arrow I-1 in Fig. 1, Fig. 3 is a cross-sectional view of Fig. 2, and Fig. 4 is a sectional view of Fig. 2. FIG. 5 is a longitudinal cross-sectional view of the flexible segment in a state where the underdrain is compressively displaced; FIG.
The figures are longitudinal cross-sectional views showing other embodiments, and FIG. 12 is a vertical cross-sectional view showing a conventional culvert. 1...Standard segment, 2...Flexible segment, 3
...Outer cylindrical body, 4...Divided cylindrical body, 5...End portion, 6
... Flange portion, 7... Flange portion for supporting the presser plate, 8... End portion, 9... Main girder, 10... Vertical rib, 11... Inner cylindrical body, 12... Divided cylindrical body, l3... base, 14...
Locking portion, 15. 16... Crocodile part, l7... End part, l
8... Main girder, l9... Vertical lip, 20. 21...
Ring-shaped waterproof packing, 22... Swelling rubber packing,
23... Cover plate, 24... Holding plate, 25.
...Bolt, 26...Nut, 30. 31. 32
．． 33... Ring-shaped water-stop packing, 34... Elastic body, 35... Core material, 36... Ring-shaped water-stop packing, 40... Inner cylinder body, 41... Flange, 42... ...Outer cylinder body, 43. 44...Tsubabe.

Claims (2)

[Claims] (1) At least one first flange is integrally formed on the inner peripheral surface of the outer cylinder attached to the end of one of the cylinders of the underdrain,
The at least two second flanges are integrally formed on the outer peripheral surface of the inner cylinder attached to the end of the other cylindrical body of the underdrain, and the outer cylinder, the inner cylinder, and the first collar are integrally formed. 1. A flexible joint for an underdrain, characterized in that a ring-shaped water-stop packing is interposed in a space surrounded by a first collar and a second collar. (2) At least one first flange is integrally formed on the outer peripheral surface of the inner cylinder that is attached to the end of one of the cylindrical bodies of the culvert, and The at least two second flanges are integrally formed on the inner peripheral surface of the attached outer cylinder, and a space surrounded by the inner cylinder, the outer cylinder, the first collar, and the second collar. A flexible joint for an underdrain, characterized in that a ring-shaped water-stop packing is inserted inside each joint.