JPH09221760A - Temporary coffering structure and method of construction thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a temporary coffering structure, by which the labor of the execution of works can be saved, the term of works be shortened and economical execution, etc., be carried out, and a method of construction thereof. SOLUTION: This temporary coffering structure is constituted by providing a cylindrical temporary body 1 being constructed around a pier 2 built in water so as to surround the pier 2, intercepting water and ensuring a working space in the periphery of the pier 2 and anchor bodies 3 being installed at the lower end section of the cylindrical temporary body 1, being fixed onto the footing section 2a of the pier 2 and fastening the cylindrical temporary body 1 onto a footing section 2a. The cylindrical temporary body 1 is constructed cylindrically in such a manner that a plurality of liner plates are connected and mounted mutually in the periphery and height direction of the pier 2 and water-expansive water stops are interposed to the mutual joining sections of the liner plates.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underwater temporary structure (hereinafter referred to as "temporary cut-off structure") mainly used for repair work of an existing bridge pier constructed in water such as a river and its construction method. Regarding

[0002]

2. Description of the Related Art When repairing a pier that has been built in water such as a river and has become painful over the years, a temporary enclosure for blocking the flow of the river around the pier to secure a prescribed work space. As a result, it is necessary to construct a temporary deadline structure.

FIG. 7 shows an example of a conventional example of this kind of temporary shut-off structure. In the figure, reference numeral 20 is an inner temporary structure constructed around the pier 21 in a cylindrical shape so as to surround the pier 21,
22 is a pier located inside the temporary structure 20 around the pier 21
An outer temporary structure constructed in a cylindrical shape so as to surround 21 and a reference numeral 23 is a filling material filled between the inner temporary structure 20 and the outer temporary structure 22. Reference numeral 20a is a liner plate that is installed around the bridge pier 21 while being connected to each other, and forms a liner plate that forms the inner temporary structure 20, and 22a is a corrugated sheet that is installed while being connected to each other around the bridge pier 21, that is the outer temporary structure 22. .

[0004]

The conventional temporary cut-off structure is constructed in this way, and the liner plates 20a and the corrugated seats 22a are joined together only by bolts and nuts. No particular measures have been taken to stop water. For this reason, the inner temporary structure
Since it is possible to block the river only after filling the filling material 23 between the 20 and the outer temporary structure 22, not only a lot of temporary materials are needed, but also a triple structure complicates the construction. However, there were problems such as inevitably increasing the scale, requiring a lot of labor, and unavoidable extension of the construction period.

Further, this type of temporary shut-off structure is a pier 21.
Although it will be removed at the same time as the completion of the repair work, there was a problem that not only the removal work was structurally troublesome, but also the reuse of materials was troublesome.

The present invention has been made in order to solve the above problems, and provides a temporary cut-off structure and a construction method thereof, which enables labor saving in construction, shortening of construction period, economical construction and the like. To aim.

[0007]

A temporary cutoff structure according to the present invention is constructed around a structure constructed in water so as to surround this structure, and water is dammed to surround the structure. A tubular temporary body that secures a work space, and an anchor body that is attached to the lower end portion of the tubular temporary body and that is fixed to the footing portion of the structure to fix the tubular temporary body to the footing portion. Is built with.

The tubular temporary body is composed of a plurality of steel segments, P
The C segment or the liner plate is connected to each other in the circumferential direction and the height direction of the structure, and the water swelling water blocking material is interposed at the joint between the steel segment, the PC segment or the liner plate. The water blocking body is constructed in a tubular shape and is attached to the lower end portion of the anchor body, and is interposed between the anchor body and the footing portion to stop water between the tubular temporary body and the footing portion. It is configured.

Further, the water blocking body is constituted by a plurality of guide liners and a water-expandable water blocking material filled between the guide liners, and the guide liner is formed by the weight of the tubular temporary body. It is configured to be crushed and come into close contact with the footing portion together with the water-swellable water blocking material.

In the construction method for a temporary cut-off structure according to the present invention, a cylindrical temporary structure installed around a structure constructed in water is constructed so as to surround the structure on the water surface,
An anchor body and a water stop body are attached to the lower end portion of the tubular temporary body, and then the tubular temporary body together with the anchor body and the water stop body is lowered into water and installed on the footing portion of the structure. Next, the anchor body is fixed on the footing portion by a plurality of anchor bolts.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION

First Embodiment of the Invention 1 to 5 show an example of the temporary cut-off structure according to claim 1 of the present invention. In the drawings, reference numeral 1 is constructed in a tubular shape having a predetermined diameter and around the pier 2. A tubular temporary body that is installed to block the flow of the river around the pier 2 and secure a working space in a predetermined space.
Is an anchor body attached to the lower end of the tubular temporary body 1 and fixed on the footing portion 2a of the pier 2 to fix the tubular temporary body 1 on the footing portion 2a of the pier 2, and Reference numeral 4 is attached to the lower end of the anchor body 3,
In addition, the water blocking body is interposed between the anchor body 3 and the footing portion 2a of the pier 2 to stop the water between the footing portion 2a and the anchor body 3.

The tubular temporary body 1 is composed of a plurality of steel segments, PC segments, or liner plates 5 (hereinafter referred to as "liner") formed from a steel plate or a PC plate into a flat plate shape or an arc shape having a predetermined curvature. A plate 5 ") is connected to each other in the circumferential direction and the height direction of the pier 2 by a plurality of joining bolts 6 and a joining nut 10 screwed to the joining bolts 6 so as to surround the pier 2, It is constructed in the shape of an elliptic cylinder or a rectangular cylinder (Figs. 2 (a), (b),
(c)).

The liner plate 5 made of a steel plate is corrugated to ensure rigidity against water pressure (see FIG. 4). Further, the water-swellable water blocking material 7 is interposed between the joints between the liner plates 5 adjacent to each other, so that the waterproof treatment of the joints between the liner plates 5 is surely performed. The water blocking material 7 is easily attached by applying it to the connecting ribs 5a protruding from the peripheral edge of the liner plate 5 or sticking a tape-shaped one to the connecting ribs 5a.

If there is a risk that the tubular temporary body 1 cannot sufficiently secure the rigidity against water pressure due to the reason that the diameter of the tubular temporary body 1 is extremely large, etc., the liner plates 5, 8 5 A plurality of ring-shaped reinforcing rings 8 made of shaped steel such as H-shaped steel are rotated in the height direction of the tubular temporary body 1 at predetermined intervals (see Fig. 3 (a)), and the strength is still increased. If there is a shortage, it is reinforced by installing a plurality of reinforcing columns 9 made of shaped steel such as H-shaped steel at predetermined intervals between the liner plates 5 and 5 adjacent to each other in the circumferential direction of the tubular temporary body 1. (See Figure 3 (b)).

In this case, the reinforcing ring 8 and the reinforcing column 9
Are connected between the liner plates 5 and 5 that are adjacent to each other, and connect the connecting rib 5a protruding from the edge of the liner plate 5, the reinforcing ring 8 and the reinforcing column 9 to the plurality of connecting bolts 6. It is fixed to the tubular temporary body 1 by joining them with the nut 10.

Further, by interposing a water-expandable water blocking member 7 at the abutting portion between the connecting rib 5a and the reinforcing ring 8 and at the abutting portion between the connecting rib 5a and the reinforcing strut 9, these joints are joined together. Water stop treatment is surely done.

The anchor body 3 is formed of a shaped steel such as a channel steel into a ring shape having substantially the same diameter as that of the tubular temporary body 1.
Anchor liner 3a attached to the lower end of the anchor pier and horizontal projections on both sides of the anchor liner 3a.
A fixing flange 3b fixed on the footing portion 2a of
A plurality of stiffeners 3c that are vertically attached to the corners of the anchor liner 3a and the fixed flange 3b and reinforce the fixed flange 3b, and are projected on the anchor liner 3a at predetermined intervals in the longitudinal direction of the anchor liner 3a. And a plurality of anchor bolts 3d (FIG. 5).
(a)).

The anchor body 3 is an anchor bolt 3d.
Through the bolt holes of the connecting ribs (the connecting ribs 5a of the liner plate 5) projecting from the lower end of the tubular temporary body 1, and the fixing nut 11 is screwed into the tip portion of the tubular temporary body 1. It is attached to the lower end of the. The anchor body 3 is fixed by bolting the fixing flange 3b onto the footing 2a of the pier 2 with a plurality of anchor bolts 12 (see FIG. 5 (a)). Further, a water-swelling water blocking material 7 is interposed between the anchor liner 3a and the connecting rib 5a to perform the water blocking treatment of this portion.

The fixed flange 3b is an anchor liner.
Continuously in the longitudinal direction of 3a, or anchor liner 3a
The vertical stiffeners 3c may be installed at predetermined intervals in the longitudinal direction of the anchor liner 3a. In addition, for example, a chemical anchor is used for the anchor bolts 12, and the anchor bolts 12 have an appropriate number and installation intervals so that the tubular temporary body 1 does not fall or slide due to wave force or water flow. It is decided and used.

The waterproof body 4 includes two guide liners 4a and 4a attached to the lower end of the anchor liner 3a along the longitudinal direction of the anchor liner 3a, and the guide liner 4
It is configured to have a water-swellable water blocking material 4b filled between a and 4a. The water blocking body 4 is interposed between the anchor liner 3a and the footing portion 2a, and the water blocking material 4b absorbs water and expands, so that the water blocking treatment between the anchor body 3 and the footing portion 2a is performed. Is surely done.

Further, the guide liner 4a is formed of a shape member which is relatively easily deformed by the weight of the tubular temporary body 1 and the tightening of the anchor bolts 12, and therefore,
The guide liners 4a, 4a are crushed and deformed due to the weight of the tubular temporary body 1 and the tightening of the anchor bolts 12, and the water blocking material 4b is brought into close contact with the footing portion 2a to further ensure water blocking.

FIG. 5 (b) shows the structure of the water blocking body 4 when the installation surface of the footing portion 2a is inclined. As the left and right guide liners 4a, different sizes are used depending on the inclination of the installation surface. There is.

Embodiment 2 of the Invention Next, the construction method of the temporary shutoff structure according to the fifth aspect of the present invention will be described in order (see FIGS. 6 (a) to 6 (e)).

First, the workbench 13 is assembled around the pier 2. The work platform 13 is assembled by building a plurality of columns 13a on the footing portion 2a of the pier 2 and straddling a scaffolding plate 13b on the water surface of the columns 13a (see FIG. 6 (a)).

A suspension stand 14 for suspending the tubular temporary body 1 before being installed is attached to the upper side of the work table 13.
The suspension base 14 is equipped with a winch 14a, and
14 is fixed to the pier 2 (see Fig. 6 (a)).

Next, the tubular temporary body 1 is assembled on the workbench 13 in a state of being suspended by the winch 14a of the suspension base 14, and the anchor body 3 is attached to the lower end portion of the tubular temporary body 1 and The water blocking body 4 is attached to the lower end of the anchor body 3 to complete the temporary cut-off structure (see FIG. 6 (b)).

Next, the temporary cut-off structure constructed in this way is gradually lowered into water and installed on the footing portion 2a (see FIG. 6 (c)). Then, the anchor body 3 is fixed onto the footing portion 2a by a plurality of anchor bolts 12 (see FIG. 6 (d)).

Further, the water in the temporary cutoff structure is pumped out to secure a working space around the pier 2 (see FIG. 6 (e)).

After the repair work of the bridge pier 2 is completed, water is supplied into the temporary shut-off structure to make the water pressure inside and outside the same, and the anchor bolt 12 is cut to pull up the temporary shut-off structure at once with the winch 14a to remove it. Alternatively, the tubular temporary body 1 is disassembled in water, and the liner plates 5 are individually pulled up by the winches 14a and removed.

In any of the removing methods, since the liner plate 5 is not particularly cut, all the liner plates 5 can be reused.

[0031]

EFFECTS OF THE INVENTION The temporary cutoff structure according to the present invention is constructed as described above, and is constructed so as to surround the structure constructed in water and to surround the structure by blocking water. A tubular temporary body for ensuring a working space, and an anchor body attached to the lower end of the tubular temporary body and fixed to the footing portion of the structure to fix the tubular temporary body to the footing portion. Built with and, in particular,
The tubular temporary body has a plurality of steel segments, PC segments or liner plates connected to each other in the circumferential direction and the height direction of the structure, and the steel segment,
It is constructed in a tubular shape by interposing a water-expandable water blocking material at the joint between the PC segments or the liner plates, and is interposed between the anchor body and the footing portion so as to connect the tubular temporary body and the footing portion. And a water-expandable water-blocking material filled between the guide liners, and a tubular temporary structure. Since the guide liner is crushed by the weight of the body and is brought into close contact with the footing part together with the water-swellable water blocking material, a temporary cutoff structure having an extremely high water blocking property can be easily constructed in a short period of time. In addition to being able to do so, there is an effect that the cost can be significantly reduced.

In the construction method for a temporary shut-off structure according to the present invention, a cylindrical temporary body installed around a structure constructed in water is constructed so as to surround the structure on the water surface, An anchor body and a water stop body are attached to the lower end portion of the tubular temporary body, and then the tubular temporary body together with the anchor body and the water stop body is lowered into water and installed on the footing portion of the structure. , Next, since the anchor body is fixed on the footing portion by a plurality of anchor bolts, in particular, since the assembly of the tubular temporary body and the attachment of the anchor body and the water blocking body are all performed on the water surface, It has the advantages of extremely high safety and extremely high construction accuracy.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a temporary cutoff structure.

2 (a), (b), (c) are plan views of a temporary shut-off structure.

FIG. 3 (a) is an enlarged view of a portion A in FIG. 1 showing the structure of a connecting portion of liner plates adjacent to each other in the vertical direction of the tubular temporary body, and (b) is adjacent to the tubular temporary body in the circumferential direction. FIG. 3 is an enlarged view of a B portion in FIG. 2 (a) showing the structure of the connection portion of the liner plate.

FIG. 4 is a vertical sectional view of a liner plate.

5 (a) is an enlarged view of a portion C in FIG. 1 showing the structures of the anchor body and the water blocking body, and FIG. 5 (b) is a longitudinal sectional view showing the structure of the water blocking body.

6 (a), (b), (c), (d) and (e) are process drawings showing a method for constructing a temporary cut-off structure.

FIG. 7 is a cross-sectional view of a conventional example of a temporary cutoff structure.

[Explanation of symbols]

1 ... Cylindrical temporary body, 2 ... Bridge pier, 3 ... Anchor body, 4 ... Water stop body, 5 ... Liner plate (steel segment, PC segment, liner plate) 6 ... Joining bolt, 7 ... Water stop material, 8 ... Reinforcement Rings, 9 ... Reinforcing columns, 10 ... Joining nuts, 11 ... Fixing nuts, 12 ... Anchor bolts, 13 ... Workbench, 14 ... Suspension stand.

Front page continued (72) Inventor Yoshinori Motohara 4-7-19 Kitahama Chuo-ku, Osaka-shi, Osaka Sumitomo Building No. 3 Sumikin Steel Products Co., Ltd. (72) Masaki Matsuda Shinmachi, Nishi-ku, Osaka-shi, Osaka 3-2-2 Daiken Co., Ltd.

Claims (5)

[Claims] 1. A tubular temporary structure, which is constructed around a structure constructed in water so as to surround the structure and blocks a water to secure a working space around the structure, and the tubular structure. A temporary cut-off structure, comprising: an anchor body attached to a lower end of the temporary body and fixed to a footing portion of the structure to fix the tubular temporary body to the footing portion. 2. The tubular temporary body comprises a plurality of steel segments,
The PC segment or liner plate is installed by being connected to each other in the circumferential direction and the height direction of the structure, and the water-expandable water blocking material is interposed at the joint between the steel segment, PC segment or liner plate. The temporary cutoff structure according to claim 1, wherein the temporary cutoff structure is formed in a tubular shape. 3. A water stop body attached to the lower end portion of the anchor body and interposed between the anchor body and the footing portion to stop water between the tubular temporary body and the footing portion. The temporary cut-off structure according to claim 1 or 2, which is characterized. 4. The water blocking body is configured to have a plurality of guide liners and a water-expandable water blocking material filled between the guide liners, and the guide liner is formed by the weight of the tubular temporary body. The temporary cut-off structure according to claim 3, wherein the temporary cut-off structure is constructed so as to be crushed and come into close contact with the footing portion together with the water-expandable water blocking material. 5. A tubular temporary body installed around a structure constructed in water is constructed so as to surround the structure above the water surface, and an anchor body and a stopper are attached to the lower end of the tubular temporary structure. A water body, and then the tubular temporary body, together with the anchor body and the water stop body, is lowered into water and placed on the footing portion of the structure, and then the anchor body is placed on the footing portion. A method of constructing a temporary shut-off structure, which is characterized in that it is fixed to a plurality of anchor bolts.