JP2006083548A - Joint structure of buried structure and method of connecting the buried structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint structure for protecting and reinforcing a flexible watertight rubber installed across two adjacent cans in the joint structure connecting, to each other, the cans forming a buried structure, and a method of reinforcing the joint structure. <P>SOLUTION: The primary watertight rubber 20 is installed across the opening parts of the adjacent two cans 10a and 10b. At the opening center x side of the primary watertight rubber 20, a flexible secondary watertight rubber 21 is installed across the cans, and foam beads 27 are filled between the primary watertight rubber 20 and the secondary watertight rubber 21. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a joint structure in a buried structure such as a buried tunnel and a shield tunnel, and a connection method thereof.

Conventionally, as described in Patent Document 1, a pair of underdrains to be connected, an annular attachment member attached to each end face of the pair of undercovers, and an outer peripheral side between the pair of attachment members A culvert joint comprising a primary water stop member provided and a short cylindrical secondary water stop member provided on the inner peripheral side between the pair of attachment members is known.
This undercarriage joint is provided with a buffer material in the space between the primary water stop member and the secondary flexible water stop member, and when the water pressure exceeding the preset value is applied to this space, the buffer material is compressed. It is characterized by deformation. In addition, according to the joint of the underdrain, even if an earthquake occurs in a state where water is accumulated in the space, both underdrains are displaced in a direction approaching each other, and the space becomes narrow, the cushioning material As a result of the compression deformation, a water escape area is secured, and an increase in water pressure in the space leading to the destruction of the secondary flexible water-stopping member can be prevented.
JP-A-7-91574

  However, as shown in FIGS. 1 to 5 of Patent Document 1, in the space between the primary water-stopping member and the secondary flexible water-stopping member, foamed resin, foam rubber, and air as a cushioning material Providing a bag, an annular rubber tube or the like is difficult because the cushioning material itself is a member having a certain size. In particular, the placement of the cushioning material in the space with respect to a joint structure that has already been constructed requires a large work such as removing all the secondary flexible water-stopping members. Have difficulty.

  Accordingly, an object of the present invention is a joint structure using a flexible water-stopping rubber for connecting openings of embedded boxes, and the water-stopping rubber is reinforced to increase the water pressure. It is providing the joint structure which can be protected from destruction by, and the connection method of the buried structure which can form this joint structure by a simple method.

In order to achieve the above object, the present invention provides:
(1) A joint structure for connecting openings of embedded boxes,
A primary waterproof rubber sandwiched or spanned between the openings of the two boxes to be connected;
A flexible secondary waterproof rubber stretched between the openings of the two boxes to be connected, closer to the opening center side of the box than the primary waterproof rubber,
A joint structure of an embedded structure, wherein foamed beads are filled between the primary water-stopping rubber and the secondary water-stopping rubber,
(2) The joint structure according to (1), wherein the foamed beads are subjected to compression deformation when subjected to a water pressure equal to or higher than a preset value.
(3) Among the openings of one box in the two boxes, a space is provided along the inner peripheral surface of the opening of the one box closer to the opening center side of the box than the secondary waterproof rubber. A plurality of ribs projecting to the other box side,
The joint structure of the embedded structure according to the above (1) or (2), wherein the ribs prevent the secondary waterproof rubber from extending to the inner space side of the box,
(4) Provided with a tertiary waterproofing rubber having flexibility, which is stretched between the openings of the two boxes to be connected, closer to the center of the opening of the box than the secondary waterproofing rubber. The joint structure of an embedded structure according to (1) or (2), characterized in that
(5) A method for connecting the openings of two buried boxes,
A primary waterproof rubber that seals the outer peripheral side and a secondary waterproof rubber that seals the inner peripheral side are attached between the openings, and the space between the openings is closed by the primary waterproof rubber and the secondary waterproof rubber. A method for connecting an embedded structure, characterized by filling foam beads into
(6) The embedded structure connecting method according to (5), wherein the filling of the expanded beads is performed by causing the expanded beads to flow into the space together with air.
(7) The filling of the foam beads is performed through a gap between the secondary water-stopper rubber and the opening, and the filling is performed from the gap. Connection method of buried structure,
I will provide a.

  In the joint structure of the embedded structure shown in (1) above, the foam beads filled between the primary water-stop rubber and the secondary water-stop rubber are completely foamed, particulate or spherical foam plastic It is. That is, the expanded beads are not expanded or pre-expanded beads (so-called expandable beads) that are raw materials for production such as expanded polystyrene, but are completely expanded and expanded beads (expanded beads). ).

  In the above joint structure, since the space between the primary waterproof rubber and the secondary waterproof rubber is filled with foam beads having a high compressibility, for example, two boxes connected by an earthquake or the like Even when displacement occurs in the direction in which the distance between the apertures of the first and second openings becomes narrow and excessive water pressure is applied to the above space, the escape beads can be secured by compressing the foam beads, and the secondary stop can be secured. It is possible to prevent an increase in water pressure in the space leading to the destruction of water rubber.

  As shown in the above (2), it is preferable that the expanded bead be compressed and deformed when subjected to a pressure equal to or higher than a preset value. This is because, for example, if the foam beads are immediately compressed and deformed by filling the space with water, even if the above-mentioned displacement occurs and an excessive water pressure is applied to the space, This is because the compressible margin (deformation allowance) of the foam beads disappears or decreases, and the effect of preventing the increase in water pressure in the space leading to the destruction of the secondary water-stopping rubber is impaired. Although not limited to this, the pressure value at which compression deformation occurs in the foamed beads is, for example, a value that exceeds the water pressure received by the secondary waterproof rubber by the water filled in the space during normal times. It is preferable to set.

According to the joint structure of the embedded structure shown in (3) above, for example, when the secondary waterproof rubber is under water pressure, the secondary waterproof rubber is used to open the box forming the embedded structure. It is possible to prevent the rib from being extended toward the center side by the rib. Therefore, it is possible to prevent a situation in which creep occurs in the secondary water-stopping rubber and the strength thereof decreases.
According to the joint structure of an embedded structure shown in (4) above, another waterproof rubber (tertiary waterproof rubber) is provided at the center of the opening of the box forming the embedded structure rather than the secondary waterproof rubber. ), The water stop between the openings of the box can be further ensured.

According to the connection method of the buried structure shown in (5) above, a simple operation of filling the space between the openings closed by the primary water-stopping rubber and the secondary water-stopping rubber with the foam beads is performed. Thus, it is possible to prevent a situation in which the secondary water stop rubber excessively extends toward the center of the opening of the box.
Moreover, according to the connection method of the embedded structure shown in the above (6), the foamed beads can be easily moved on the airflow, so that the primary waterstop rubber and the secondary waterstop rubber The operation of filling the space between the openings closed by the foamed beads can be easily performed.

According to the connection method of the embedded structure shown in (7) above, even if the openings of the box forming the embedded structure are already connected with the secondary waterproof rubber, The filling operation of the foam beads into the space can be performed without a time-consuming process of removing all the water rubber.
Therefore, according to the embedded structure connection method shown in the above (5) to (7), it is possible to save time and labor when forming the joint structure of the embedded structure according to the present invention.

  According to the present invention, a simple structure is installed on the joint structure of the buried structure, and the bridge is spanned between the openings of the two boxes to be buried by a simple method. By protecting the waterproof rubber having flexibility, the joint structure of the buried structure can be reinforced.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view showing an embodiment of a joint structure of an embedded structure according to the present invention, and FIG. 2 is an explanatory view showing an example of a reinforcing method of the joint structure of the embedded structure.
In the embodiment shown in FIG. 1 and FIG. 2, the boxes 10a and 10b that form the embedded structure include, for example, a substantially rectangular parallelepiped, and include a cavity that leads from one surface to a surface facing this surface. Or a substantially cylindrical body. In FIGS. 1 and 2, a substantially rectangular parallelepiped box is shown.

One box 10a includes an outer circumferential surface 12a and an inner circumferential surface 13a that defines a cavity inside the box. Further, the opening end 11a in the opening of the box 10a has a direction from one opening end to the other opening end (in the case where the box is a substantially cylindrical body, its axial direction. Hereinafter, “connection direction”) It has a gasket beam 14a protruding along z.
The other box 10b includes an open end 11b, an outer peripheral surface 12b, an inner peripheral surface 13b, and a gasket beam 14b, as with the one box 10a. As shown in FIG. 1, when two boxes 10a and 10b are arranged with their openings facing each other, each part of the other box 10b is arranged symmetrically with the one box 10a. .

The end surface in the connection direction z of the gasket beam 14a is a connection surface 15a with the adjacent box 10b, and will be described later between the connection surface 15a and the corresponding connection surface 15b in the other box 10b. The primary waterproof rubber 20 is clamped.
Of the gasket beam 14a, the opening center side x of the box 10a is a fastening surface 16a for fixing a secondary water-stopping rubber 21 to be described later with a bolt 22, and this fastening surface 16a and the other side A secondary water-stopping rubber 21 described later is stretched between the corresponding fastening surface 16b in the box 10b.

In the embodiment shown in FIG. 1 and FIG. 2, the joint structure connecting two adjacent boxes has a primary waterproof rubber 20, a flexible secondary waterproof rubber 21, and a primary waterproof rubber. 20 and a foam bead 27 filled in a space between the secondary water stop rubber 21.
As described above, the primary waterproof rubber 20 is sandwiched between the connection surfaces 15a and 15b of the gasket beams 14a and 14b in the two boxes 10a and 10b to be connected. The primary waterproof rubber 20 is an essential component in the present invention, and is continuously disposed along the outer peripheral surfaces 12a and 12b of the box between the open ends 11a and 11b of the boxes 10a and 10b. It is an endless member.

  Examples of the primary water-stopping rubber include flexible water-stopping rubbers (flexible joints) such as the so-called Gina-type rubber gasket shown in FIG. There are so-called crown seal joints used in the joint structure of a sinking box. When the primary water-stopping rubber is a flexible joint such as an omega joint or a crown seal joint, the primary water-stopping rubber is not compressed or sandwiched between the two boxes, but between the two boxes. Arranged over.

  As described above, the secondary waterproof rubber 21 is stretched between the fastening surfaces 16a and 16b of the gasket beams 14a and 14b in the two boxes 10a and 10b to be connected. The secondary water-stopping rubber 21 is an essential component in the present invention, and is closer to the opening center side of the box than the primary water-stopping rubber 20 between the open ends 11a and 11b of the two boxes 10a and 10b. x is an endless member having flexibility, which is continuously disposed along the inner peripheral surfaces 13a and 13b of the box.

The secondary waterproof rubber is not particularly limited except that it is a flexible waterproof rubber. For example, various shapes of flexible joints such as a so-called omega joint shown in FIG. Can be mentioned.
The foam beads 27 filled in the space between the primary waterproof rubber 20 and the secondary waterproof rubber 21 are essential components in the present invention.

The material of the expanded beads is not particularly limited, and various expanded plastics such as expanded polystyrene can be adopted.
The particle size of the foamed beads may be set as appropriate from the viewpoint of easy filling of the space between the primary water-stopping rubber 20 and the secondary water-stopping rubber 21 and a large deformation allowance due to compression. Therefore, the particle diameter of the expanded beads is not particularly limited, but usually varies from a small particle diameter of about several millimeters to a diameter of about several centimeters (for example, a softball large one). Can be set within the range. Further, for example, from the viewpoint of improving the filling rate of the expanded beads in the space, expanded beads having different particle diameters may be mixed and used.

The pressure value at which compression deformation occurs in the expanded beads can be appropriately set by adjusting the resin material forming the expanded beads, the compounding agent in the resin, the formulation thereof, and the like.
In addition, for example, when the joint structure of the buried structure is buried at a position where the water depth is 30 m, about 3 kg of water pressure is applied to the buried structure, and water leakage occurs from the primary water blocking rubber 20. If there is, a water pressure of about 3 kg is applied to the secondary water stop rubber 21 without applying a special load. Therefore, for example, when the embedded structure is embedded at the above water depth, it is required to use the foamed beads 27 having a pressure required to crush the particles of 3 kg or more.

  A method for filling the space between the primary waterproof rubber 20 and the secondary waterproof rubber 21 with the foam beads 27 is not particularly limited. For example, an attachment member for the secondary waterproof rubber 21 is used. The space may be filled with foam beads 27 after a partial clearance is provided between the secondary waterproof rubber and the box opening by partial removal. Since each foamed bead has a small particle size, the filling operation of the foamed bead can be performed without removing the entire secondary waterproof rubber 21.

In particular, when the nozzle 30 is inserted into the part where the mounting member of the secondary water blocking rubber 21 is partially removed, and the foam beads 27 are allowed to flow into the space together with air from the nozzle 30. The filling operation can be performed efficiently.
FIG. 3 is a cross-sectional view showing another embodiment of the joint structure of the buried structure of the present invention, and FIG. 4 is a perspective view for explaining the embodiment shown in FIG. In FIG. 4, in the joint structure shown in FIG. 3, one of the adjacent boxes, the primary waterproof rubber 20, the secondary waterproof rubber 21 and the like are omitted.

In the embodiment shown in FIGS. 3 and 4, the boxes 10a and 10b forming the embedded structure are the same as those in the embodiment shown in FIG.
In the embodiment shown in FIG. 3 and FIG. 4, the joint structure connecting two adjacent boxes has a primary water-stopping rubber 20, a secondary water-stopping rubber 21, a plurality of ribs 25, and a pressure-resistant plate 26. And tertiary water stop rubber 28. In addition, a space between the primary waterproof rubber 20 and the secondary waterproof rubber 21 is filled with foam beads 27.

In the embodiment shown in FIGS. 3 and 4, the primary waterproof rubber 20 and the secondary waterproof rubber 21 are the same as those in the embodiment shown in FIG. 1.
The plurality of ribs 25 are optional components in the present invention, and are attached to the open end 11a of one box 10a among the two boxes to be connected. A plurality of the ribs 25 are arranged along the inner peripheral surface 13a of the box 10a at a distance and protruding toward the other box 10b. Further, the rib 25 is disposed closer to the opening center side x of the box than the secondary waterproof rubber 21.

  The formation, number, and arrangement interval of the ribs 25 are not particularly limited, and when the secondary waterproof rubber 21 is subjected to a load to be extended toward the opening center side x of the box, What is necessary is just to set to the grade which can support the water stop rubber 21 and can suppress the expansion | extension. Further, when the pressure plate 26 described later is spanned between two or more adjacent ribs 25, the pressure plate 26 may be set to such an extent that the pressure plate 26 can be prevented from being deformed by the load. For example, but not limited to this, in a box having a total circumferential length of about 90 m along the outer peripheral surface in the opening, ribs having a width of about 1 cm are spaced along the inner peripheral surface of the box. In addition, when a steel plate (pressure plate) having a thickness of about 16 mm is arranged on the outer peripheral side of the box in this rib, the rib arrangement interval may be about 2 to 5 m. . In addition, the width of the ribs, the arrangement interval, the thickness of the pressure plate, etc. are determined according to the size of the water pressure acting on the box, and the required dimensions vary greatly depending on the working water pressure. It is. Therefore, it is necessary to calculate the required dimensions by calculating the strength each time the box is constructed.

The material of the rib 25 is not particularly limited. For example, when the attachment surface of the rib 25 in the box 10a is a metal, the rib 25 is preferably made of metal. In this case, since the rib 25 can be welded and fixed to the mounting surface of the box 10a, the mounting operation of the rib 25 can be simplified.
As described above, the rib 25 is fixed on one box 10a in two adjacent boxes, and one rib 25 is fixed to each of both boxes 10a and 10b. It is necessary to avoid it. By setting in this way, for example, due to an earthquake or the like, the rib 25 may be deformed or damaged even when the adjacent two boxes 10a and 10b are displaced or open. It is possible to prevent a problem such as breakage of a connection portion with the box 10a.

  As shown in FIG. 4, the plurality of ribs 25 are fixed only on one box 10a of two adjacent boxes, for example, a rib fixed to one box 10a, and the other The ribs fixed to the box 10b may be arranged regularly (for example, alternately). Even in this case, one rib needs to be fixed only on one of the two adjacent boxes.

The pressure plate 26 is an arbitrary component in the present invention, and is arranged so as to span between two or more ribs 25. Specifically, the pressure-resistant plate 26 is placed and fixed on a surface of the rib 25 on the opening outer peripheral surface side y of the box.
For example, as shown in FIG. 4, the rib 25 that fixes the pressure-resistant plate 26 needs to be fixed to only one box 10 a of the two boxes 10 a and 10 b to be connected. In addition, as described above, when the rib fixed to one box 10a and the rib fixed to the other box 10b are mixed, the pressure-resistant plate 26 is either box. It is necessary to be fixed only to the ribs 25 fixed to. In one pressure-resistant plate 26, a portion joined to a rib fixed to one box 10a and a portion joined to a rib fixed to the other box 10b are mixed. By preventing the rib 25 and the pressure-resistant plate 26 from being deformed or damaged or the connecting portion from being damaged even if the adjacent two boxes 10a and 10b are displaced or open. it can.

The material of the pressure plate 26 is not particularly limited, and examples thereof include a plate-like member such as a steel plate.
The tertiary water stop rubber 28 is an optional component in the present invention. As this tertiary waterproofing rubber, for example, a flexible joint such as the flexible joint shown in FIG.

  In the embodiment shown in FIG. 3, the tertiary water-stopping rubber (flexible joint) 28 is located closer to the opening center side x of the box than the secondary water-stopping rubber 21, and the opening ends 11 a and 11 b of the two boxes 10 a and 10 b. It is stretched between. Reference numerals 29a and 29b are attachment members for the third water stop rubber 28 fixed to the open ends 11a and 11b. The tertiary water stop rubber 28 is a so-called flexible joint, and is an endless member having flexibility, which is continuously arranged along the inner peripheral surfaces 12a and 12b of the box.

The tertiary waterproofing rubber is not particularly limited except that it is a flexible waterproofing rubber. In addition to the flexible joint shown in FIG. 4, various shapes of flexible joints should be adopted. Can do.
The present invention is not limited to the above description, and various design changes can be made within the scope of the matters described in the claims.

It is sectional drawing which shows one Embodiment of the joint structure of the embedded structure which concerns on this invention. It is explanatory drawing which shows an example of the reinforcement method of the joint structure of the embedded structure which concerns on this invention. It is a perspective view which shows other embodiment of the joint structure of the buried structure which concerns on this invention. It is a perspective view for demonstrating embodiment shown in FIG.

Explanation of symbols

10a, 10b Boxes 11a, 11b Open end 20 Primary waterproof rubber 21 Secondary waterproof rubber 25 Rib 26 Pressure-resistant plate 27 Foam beads 28 Tertiary waterproof rubber x Opening center side y Opening outer peripheral surface side

Claims (7)

It is a joint structure that connects the openings of the buried box,
A primary waterproof rubber sandwiched or spanned between the openings of the two boxes to be connected;
A flexible secondary waterproof rubber stretched between the openings of the two boxes to be connected, closer to the opening center side of the box than the primary waterproof rubber,
A joint structure for an embedded structure, wherein foamed beads are filled between the primary waterproof rubber and the secondary waterproof rubber.   2. The joint structure according to claim 1, wherein the foamed beads are compressed and deformed when subjected to a pressure equal to or higher than a preset value. Of the openings of one box in the two boxes, the other side of the opening of the one box is spaced closer to the center of the opening of the box than the secondary waterproof rubber, and the other With multiple ribs projecting to the box side,
The joint structure for an embedded structure according to claim 1 or 2, wherein the ribs prevent extension of the secondary waterproof rubber toward the inner space of the box.   It is characterized by further comprising a tertiary water-stopping rubber having flexibility, which is stretched between the openings of the two box bodies to be connected to the opening center side of the box body from the secondary water-stopping rubber. The joint structure of an embedded structure according to claim 1 or 2. It is a method of connecting the openings of two embedded boxes,
A primary waterproof rubber that seals the outer peripheral side and a secondary waterproof rubber that seals the inner peripheral side are attached between the openings, and the space between the openings is closed by the primary waterproof rubber and the secondary waterproof rubber. A method for connecting an embedded structure, characterized in that foam beads are filled.   6. The embedded structure connecting method according to claim 5, wherein the filling of the expanded beads is performed by allowing the expanded beads to flow into the space together with air.   The method for connecting an embedded structure according to claim 5 or 6, wherein the filling of the foam beads is performed through a gap between the secondary still rubber and the opening. .

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