JP2001323476A - Cofferdam constuction method and cofferdam structural body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cofferdam construction method capable of easily constructing, whithout using any special apparatus, structural body for forming a working environment in dry condition around piers. SOLUTION: The cofferdam construction method comprises a process A for connecting a plurality of cofferdam members 4 together in annular form at a predetermined site while setting them afloat on water, each of the members having an exterior wall part, an interior wall part and a cavity part; a process B for completing the cofferdam structural body by stacking cofferdam structure 4, other than cofferdam annular members 4, each opened on its sides to be abutted against the adjacent cofferdam members 4 to construct a cylindrical structural body 6 and at the same time injecting water into the cavity parts of the cofferdam structures 4 constituting the cylindrical structural body 6, then adjusting the upper end of the cylindrical structural body 6 so that it is always located at an appropriate height above the surface of water 15; and stopping the stacking work of cofferdam members 4 when the cylindrical structural body 6 is finally grounded in the water; and a process C for draining water preset in an area surrounded by the cofferdam structural body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temporary deadline construction method and a temporary deadline structure for creating a work space under dry conditions suitable for construction when constructing underwater structures such as piers. About the body.

[0002]

2. Description of the Related Art When performing repair work on an existing pier, it is necessary to create a work space around the pier under dry conditions, that is, under conditions not buried by water. For this purpose, first, a temporary closing structure consisting of a cylindrical wall is constructed around the pier, and then the water existing in the area surrounded by the temporary closing structure is drained, and repair work on the pier is performed. A series of operations are performed to create a dry working environment that can be operated. When constructing the temporary closing structure, there is a horizontally extending beam above the pier to support the road to be erected. It is physically impossible to transport the member for the temporary closing structure having an increased height to the construction site and sink it in the vertical direction.

In order to solve this problem, for example, Japanese Patent Application Laid-Open No. H11-13064 discloses, as shown in FIG.
A circular rail 105 is rotatably arranged and supported in a horizontal plane on a fixed frame 104 directly fixed to a bracket 103 protruding from a beam portion 102 of a pier 101 via a wire, and a plurality of units are wound around the circular rail 105. Apparatus 10
6 and the circular rail 105 is rotated by a rotary drive mechanism disposed on the fixed frame 104, so that the entire circumference of the mounting ring 108 is closed at a predetermined fixed position. The member 107 is mounted ((a) in FIG. 17), the mounting ring 108 is lowered by the hoisting device 106, and the circular rail 105 is rotated by the rotation driving mechanism disposed on the fixed frame 104, and is fixed at a predetermined fixed position. Then, another closing member 107 is attached above the previously attached closing member 107 ((b) and (c) in FIG. 17), and by repeating this, the closing member 107 is settled while being assembled into a cylindrical shape ( A temporary closing method adapted to perform (d) in FIG. 17 is disclosed. According to this method, even when the water depth of the place where the temporary closing method is performed is deeper than the height of the space above the water surface, the closing member 107 can be assembled without any trouble.

[0004]

The technique described in the above publication has the advantage that the shut-off member can be assembled even in a place where the water depth is large, but requires tools such as a fixed frame, a circular frame, and a hoisting device. Requires a great deal of labor and money to manufacture and install these instruments. Also, fixed and circular frames can only be used for piers with a cross section of a certain diameter,
It is difficult to cope with the case where the cross section of the pier has various diameters or the cross section has a flat elliptical shape. That is, when there are various sizes and shapes of the cross section of the pier, it is necessary to prepare various fixtures and the like corresponding to them. Thus, the technique described in the above publication has a problem that it lacks versatility.

[0005] In view of the above-mentioned problems of the prior art, the present invention provides a temporary closing structure without any trouble even when the distance between the beam portion of the pier and the water surface is smaller than the depth of the water. It can be constructed, does not require special equipment and tools for constructing the temporary closing structure, and can handle any size or shape of the pier cross section, and is easy and quick. It is another object of the present invention to provide a temporary deadline construction method and a temporary deadline structure capable of constructing a temporary deadline structure at a low cost.

[0006]

According to a temporary closing method according to the first aspect, after a temporary closing structure consisting of a cylindrical wall is installed in water, the temporary closing structure is provided in an area surrounded by the temporary closing structure. A temporary closing work method for creating a work space under dry conditions suitable for construction, comprising: an outer wall portion, an inner wall portion facing the outer wall portion, the outer wall portion and the inner wall portion. A plurality of temporary shut-off members having a hollow portion existing therebetween are floated on water such that the outer wall portion and the inner wall portion form a wall extending in a vertical direction and the inner wall portion is located on the side of the work space. Step (A) of annularly connecting in a state where the outer and inner wall portions are similar to the temporary closing member connected in an annular shape, and a cavity in which a contact surface with an adjacent temporary closing member is opened. The temporary closing member having a portion is sequentially stacked to form a temporary closing member. At the same time as constructing the tubular structure, water is poured into the cavity of the temporary closing member constituting the tubular structure, and the upper end of the tubular structure is always positioned above the water surface. Adjusting the position so as to have a height, and finally, when the tubular structure comes into contact with the ground in water, stop the work of stacking the temporary closing members and complete the temporary closing structure ( B) and a step (C) of draining water existing in a region surrounded by the temporary closing structure. According to this structure, a temporary closing structure having a desired size and shape can be easily completed without any troublesome operation other than the operation of connecting a number of temporary closing members. .

In the temporary closing work method, the following method can be employed to prevent water from entering the work space. That is, in the temporary closing construction method in which the temporary closing structure is installed around a footing of a building (a bridge pier or the like) to be subjected to the construction, the temporary closing construction method is performed between the step (B) and the step (C). Next, the next step, that is, using the temporary closing member having a guide rail extending in the vertical direction on the outer surface of the inner wall portion, filling the gap between the temporary closing structure and the footing. An extendable portion (e.g., a simple cylinder configured so that a thickness dimension can be adjusted within a certain range) and a locking portion (e.g.,
When no external force is applied, the projection is made to project in the horizontal direction by the force of the spring, and when pushed from the outside, it can be stored inside against the force of the spring). The device is slid downward along the guide rails which are extended in a straight line in the vertical direction by stacking the temporary closing members. When reaching the position of the cutoff member, the locking portion of the water-blocking auxiliary device is locked to the lower end (lower surface) of the lowermost temporary closing member, and the telescopic portion of the water-blocking auxiliary device is extended. Then, a step of contacting the waterproofing auxiliary device with the footing to prevent water from entering from below may be included (claim 2). According to this structure, since the gap between the temporary closing structure and the footing is filled with the water-blocking auxiliary device, water does not enter the working space from below. In addition, since the locking portion is locked to the temporary closing member at the lowermost end of the auxiliary device for water shielding, it does not move upward due to water pressure or the like from below.

In order to prevent water from entering the working space,
Instead of the above method, the following method can be adopted. That is, in the temporary closing construction method in which the temporary closing structure is installed around a footing of a building to be subjected to the construction, the following steps (B) and (C) are performed between the steps (B) and (C). In the process, that is, a temporary closing member having a guide rail extending in the vertical direction on the outer surface of the inner wall portion is used, and a thickness slightly smaller than a distance between the temporary closing structure and the footing (specifically, Specifically, the water-impedance assisting device having a size adjusted to be several cm smaller than the above-described distance) and having a locking portion is linearly and vertically extended by stacking the temporary closing members. Slid downward along the guide rails joined and connected to each other, and when the water shielding auxiliary device reaches the position of the lowermost temporary closing member, the locking portion is The lowermost temporary closing member With engaged on the end (lower surface), by filling a water-impervious material below the impermeable auxiliary instrument, the step of preventing the entrance of water from below, it is sufficient included (claim 3). According to this structure, first, the gap between the temporary closing structure and the footing is partially filled by the water blocking auxiliary device, and only a small gap (for example, a gap having a thickness dimension of 100 mm or less) is formed. Will remain. And
By supplying a water-blocking material to the gap, it is possible to effectively prevent water from entering the working space from below.

In any of the above-mentioned methods that can be used to prevent water from entering the working space, the following method is used as a method of blocking water at the corners of the temporary closing structure formed in a rectangular tubular shape. Can be adopted. That is, at the corners of the temporary closing structure formed by connecting the temporary closing members to each other substantially vertically in the horizontal direction,
Between the above step (B) and the above step (C), the next step, that is, the distance between the temporary closing structure and the footing (the thickness dimension of the gap having an L-shaped cross section, , Which has a slightly smaller thickness dimension than that of a corner portion and has a locking portion (for example,
Attaching the adjustment plate to adjust the thickness dimension), along the guide rails which are linearly extended and joined in a straight line to the temporary closing member forming a corner of the temporary closing structure, Sliding downward, when the corner portion impervious auxiliary device reaches the position of the lowermost temporary closing member, the locking portion of the corner portion impervious auxiliary device is moved to the lowermost end position. The method may further include a step of locking the lower end (lower surface) of the temporary cutoff member and filling a water blocking material below the corner water blocking auxiliary device to prevent water from entering from below. (Claim 4). With this configuration, the gap between the corner of the temporary closing structure and the footing can be completely filled, and water can be completely prevented from entering the working space.

A temporary closing structure according to a fifth aspect of the present invention is a temporary closing structure installed as a cylindrical wall in water, and a temporary closing member, which is a constituent unit of the temporary closing structure, is horizontally moved. And a temporary closing member, wherein the temporary closing member is provided with an outer wall portion extending in a vertical direction for preventing water from entering from outside, and a vertical direction facing the outer wall portion. Having an inner wall portion extending to the outer wall portion and the inner wall portion, and in a state where the cavities of the temporary closing member are communicated with each other, water is supplied into the hollow portion of the temporary closing member. It is characterized by being stored. With this configuration, when constructing the temporary closing member, the upper end of the cylindrical structure including the temporary closing member is always adjusted by adjusting the amount of water injected into the cavity of the connected temporary closing member. The temporary closing member can be connected at a predetermined height above the water surface because it can be positioned at a certain height above the water surface. In addition, when the temporary closing structure is removed, the water in the cavity of the temporary closing member is gradually drained, so that the temporary closing structure can be gradually lifted upward. It can be performed at a predetermined height above.

The temporary closing structure may be provided with a water-blocking auxiliary device to prevent water from entering a working space formed inside the temporary closing structure. . That is, in the temporary closing structure installed around a footing of a building to be constructed, the temporary closing member includes a guide rail extending in a vertical direction on an outer surface of the inner wall portion, And the guide rail is
The temporary closing structure and the footing are linearly extended and joined in a vertical direction across the plurality of temporary closing members stacked in the vertical direction, and are connected to the guide rail of the temporary closing member at the lowermost end. An elastic portion (e.g., a simple cylinder configured so that the thickness dimension can be adjusted within a certain range by a simple cylinder) and a locking portion (e.g., an external force When it is not applied, it protrudes in the horizontal direction by the force of the spring, and when pushed from the outside, it is configured to be stored inside against the force of the spring). The locking portion can be configured so as to be fixed to the lower end (lower surface) of the lowermost temporary closing member and to be attached in a state of contacting the footing. 6). With this configuration, since the gap between the temporary closing structure and the footing is filled with the water-blocking auxiliary device, water does not enter the working space from below. Further, since the locking portion of the auxiliary device for water blocking is in contact with and locked to the lower surface of the temporary closing member at the lowermost end, it does not move upward due to water pressure or the like from below.

In order to prevent water from entering the working space, the following configuration may be used instead of the above configuration. That is, in the temporary closing structure installed around a footing of a building to be constructed, the temporary closing member includes a guide rail extending in a vertical direction on an outer surface of the inner wall portion, The guide rail extends linearly in the vertical direction across the plurality of temporary closing members stacked in the vertical direction and is joined, and the guide rail of the temporary closing member at the lowermost end is connected to the guide rail. It has a thickness slightly smaller than the distance between the temporary closing structure and the footing (specifically, a thickness adjusted to be several cm smaller than the distance), and has a locking portion. A water-blocking auxiliary device is attached with the locking portion locked to the lower end (lower surface) of the lowermost temporary closing member, and a water-blocking material is filled below the water-blocking auxiliary device. Configuration so that Can (claim 7). According to this structure, first, the gap between the temporary closing structure and the footing is partially filled by the water blocking auxiliary device, and only a small gap (for example, a gap having a thickness dimension of 100 mm or less) is formed. Will remain. Since the water blocking material is supplied to the gap, it is possible to effectively prevent water from entering the working space from below.

In any of the above configurations, it is possible to further include a water blocking means at a corner of the temporary closing structure formed in a rectangular cylindrical shape. That is, the temporary closing structure is formed by connecting the temporary closing members to each other substantially vertically in the horizontal direction and forming a corner of the temporary closing structure at a corner of the temporary closing structure. The guide rail of the temporary closing member at the lower end is slightly longer than the distance between the temporary closing structure and the footing (the thickness of a gap formed in an L-shaped cross section, and there are two of them). A corner portion having a small thickness (specifically, a thickness adjusted to be several centimeters smaller than the above distance) and having a locking portion, It is attached so as to be engaged with the lower end (lower surface) of the lowermost temporary closing member, and is configured to be filled with a water-blocking material below the corner-portion water-blocking auxiliary device. it can. With this configuration, the gap between the corner of the temporary closing structure and the footing can be completely filled, and water can be completely prevented from entering the working space.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 are front views for explaining an example of the construction method of the present invention, FIG. 5 is a perspective view showing an example of a temporary closing member used in the present invention, and FIG. FIG. 7 is a diagram showing an example of a means for connecting in the directions.
FIG. 8 is a front view showing another construction example according to the present invention, FIG. 8 is a view taken along the line AA in FIG. 7, and FIG. FIG. 10 is a perspective view, FIG. 10 is a front view of the water impervious auxiliary device, FIG. 11 is a rear view of the water impervious auxiliary device, FIG. 12 is a plan view of the water impervious auxiliary device, and FIG.
(A) is a side view showing the water-blocking auxiliary device in a state in which the locking portion is housed and the expansion and contraction portion is not extended, and (b) is
FIG. 14 is a side view showing the water-impedance auxiliary device in a state where the locking portion protrudes and the expansion and contraction portion is extended. FIG. FIG. 15 is a vertical cross-sectional view showing a contacting state, and FIG. 15 shows a water-shielding auxiliary device attached to the temporary closing structure,
FIG. 16 is a vertical cross-sectional view showing a state where the water-impermeable material is filled, FIG. 16 is a horizontal cross-sectional view showing a position where a corner water-impedance auxiliary device is installed, and FIG. 17 is a diagram showing a conventional construction method.

In the construction method of the present invention, as shown in FIG. 1, first, around a pier 3 located below a beam portion 2 supporting a road 1, a plurality of constituent units of a temporary closing structure are provided. The box-shaped temporary closing member 4 is floated, and the temporary closing member 4 is connected in the horizontal direction while using the positioning device 5 to assemble the annular structure 6 around the pier 3. In this specification, the term “annular structure” refers to a structure having a horizontal section such as a rectangular shape, a square shape, a circular shape, and an elliptical shape formed by connecting temporary closing members (ie, , A closed structure capable of partitioning the outside and the inside).

The positioning device 5 is an extendable rod-shaped device for setting the distance between the vertical wall of the pier 3 and the temporary closing member 4 to a predetermined size. 4
And a roller that rotates in accordance with the vertical movement of the temporary closing member 4 is provided at the other end, and a contact plate for contacting the vertical wall of the pier is provided at the other end. I have. The distance between the roller and the contact plate can be adjusted to a desired size by adjusting the length of the main body having the jack mechanism.

A muddy water intrusion prevention device 7 and a grounding mounting device 8 are mounted in advance below the temporary closing member 4 used to form the lowermost layer of the temporary closing structure. The muddy water intrusion prevention device 7 is to be brought into contact with a vertical wall of a footing 10 (a base unit integrally formed at a lower end of a pier) mounted on an upper end of a concrete column 9 buried deep in the ground. And a jack 7b for pushing the brush 7a toward the vertical wall of the footing 10. The brush portion 7a is pressed against the vertical wall portion of the footing 10 by the jack portion 7b to prevent intrusion of muddy water from below. The brush part 7a
Is composed of a large number of steel wires coated with grease, and a plurality of scale-like steel plates provided so as to cover them from above. The grounding attachment 8 is a member that forms a grounding portion of the temporary closing structure, and has a tapered shape at the bottom, so that when it lands on the mud (water bottom) 24 in water, it is placed in the soil by an appropriate depth. The buried and constructed temporary closing structure is prevented from moving in the horizontal direction.

An example of the temporary closing member 4 is shown in FIG. 5, for example. The temporary closing member 4 has a rectangular parallelepiped box shape that is open only at the top. More specifically, the temporary closing member 4 includes a frame 4 forming an outline of an outer shape.
a (longitudinal direction), 4b (short direction and height direction), and a bottom surface, two longitudinal side wall surfaces, and two plate-like bodies 4c, 4d attached to the lateral direction. 4e
Consists of Here, the two side walls in the longitudinal direction (the surface on which the plate-like body 4d is attached) prevent water existing around (outside) the annular temporary closing structure at the time of constructing the temporary closing structure. And an inner wall portion located on the side facing the outer wall portion (the side on which the work space for construction is formed). Further, the frame portions 4b existing at the upper end and the lower end of the two lateral side surfaces (the surface on which the plate-like body 4e is attached) in the short direction are provided in the temporary closing structure
A horizontally extending beam portion interposed between the outer wall portion and the inner wall portion is formed. In order to avoid bending of the plate-shaped member 4d due to water pressure or to reinforce the temporary closing member 4, the plate-shaped member 4d
d, 4e, reinforcing members 4f, 4c
It is good to provide 4 g.

The plate-like members 4c, 4e attached to the bottom surface and the two side wall surfaces in the lateral direction are composed of frames 4a, 4b.
It is attached so that it can be removed from the server, and is removed when the temporary closing members 4 are connected to each other. As a result, a communication path in which the hollow portions 11 communicate with each other is formed between the temporary closing members 4 that are connected adjacently in the horizontal direction and the vertical direction, and a cylindrical structure including the temporary closing members 4 is formed. Water is gradually accumulated from below to above by the water injection over the entire cavity of the body.

A plate having the same size as the plate 4c on the bottom surface may be attached to the upper surface of the temporary closing member 4 and detached when the temporary closing member 4 is connected. In this case, the temporary closing member 4 having an upper opening is inclined for some reason while floating on the water, and there is no possibility of causing an accident such as intrusion of water and sinking in the water, which is convenient. The size of the temporary closing member 4 shown in FIG. 5 is not particularly limited, but usually, the width in the longitudinal direction is 1,500 to 2,0,0.
Approximately 00mm, width in the short direction (width of contact surface) 1,000 to 1,500
It is about mm and the height is about 1,000 to 1,500 mm.

In order to connect the temporary closing members 4 to each other in the horizontal direction, as shown in FIGS. 5 and 6, a connecting means 12 provided near the edge of the side wall surface in the short direction is used. Connecting means 12
Can be inserted with a slide-type pin 13 capable of forming a protrusion protruding in the horizontal direction from the frame 4b of the temporary closing member 4, and a slide-type pin 13 provided on the frame 4b of another adjacent temporary closing member 4. And a recess (not shown). For example, as shown in FIG. 6, the slide pin 13 is attached so as to be able to move in the horizontal direction by a cylinder mechanism 14 arranged on the back side.

FIG. 6A shows a state in which the slide pin 13 is retracted into the frame 4b, and FIG.
Shows a state in which the slide pin 13 protrudes outward from the inside of the frame 4b and can be inserted into the recess of the adjacent temporary closing member 4. Note that the connecting means is shown in FIG.
In addition to those shown in FIG. 6, any means (for example, bolts and nuts) can be used as long as the temporary closing members 4 can be closely connected to each other. The operation of connecting the temporary closing members 4 in the horizontal direction is performed by a worker on a boat. The temporary closing member 4 is, as described above,
Since it has the hollow portion 11 (see FIG. 5), it does not sink even when placed on the water surface, only the lower portion sinks below the water surface, and the upper portion floats on the water with the upper surface appearing on the water surface 15. Therefore, the worker can perform the connection work of the temporary closing member 4 while on the boat.

A rubber packing is interposed between the temporary closing members 4 connected in the horizontal direction in order to prevent water from entering. The rubber packing is formed in a shape that can be attached to the peripheral portion of the connection surface (the lateral side wall surface) of the temporary closing member 4. Note that, instead of the rubber packing, another sealing material that can form a watertight structure may be used.

When connecting the temporary closing members 4 in the horizontal direction and constructing an annular structure 6 having a rectangular or square shape around the pier 3, to fix the corners of the annular structure 6 The connecting means such as the sliding pin 13 and the temporary closing member 4
The temporary shutoff members 4 forming the corners of the annular structure 6 are fixed in a watertight state by disposing them at an appropriate position on the side wall portion or by using an elongate member having an L-shaped cross section. Such a method may be adopted.

As the temporary closing member 4, a member having an outer wall portion and an inner wall portion having a curved surface such that a cross section cut in a horizontal direction becomes an arc shape may be used. In this case, if the temporary closing members 4 are connected in the horizontal direction, a plurality of temporary closing members 4
Is formed. In order to make the diameter of the circular structure a desired size, the temporary closing member 4 may be manufactured so that the outer wall portion and the inner wall portion have a curvature corresponding to the diameter. Further, a temporary closing member having an outer wall portion and an inner wall portion having such an arc-shaped curved surface, and a temporary closing member 4 having a flat outer wall portion and an inner wall portion (a temporary closing member as shown in FIG. 5). By assembling together, it is also possible to construct an annular structure 6 having a horizontal cross section in which both ends are semicircular and the middle is rectangular.

After the formation of the annular structure 6 comprising the temporary closing member 4, as shown in FIG. 2, another surface of the annular structure 6 is placed on the upper surface of the annular structure 6 using a crane 22 installed on a ship 21. The temporary closing members 4 are stacked to construct a cylindrical structure 6 including two layers of the temporary closing members 4. After that, the same stacking operation is repeated to gradually increase the height of the tubular structure 6. At this time, the temporary closing member 4 to be newly stacked is
Before being mounted on the ring-shaped structure 6 by the crane 22, the bottom plate 4c and the plate-like body 4e of the lateral side wall surface (and the upper surface when the plate-like body is also attached to the upper surface). Plate-shaped body).

A rubber packing or other sealing material capable of forming a watertight structure is interposed between the two temporary closing members 4 which are vertically overlapped with each other to prevent water from entering. The rubber packing or the like may be previously attached to the peripheral portion of the upper or lower surface of the temporary closing member 4, that is, the upper or lower surfaces of the frames 4a and 4b extending in the horizontal direction. In order to connect the two temporary closing members 4 that are vertically overlapped with each other, for example, holes for bolt insertion are formed in frames 4a and 4b extending in the horizontal direction of the temporary closing member 4, and the bolts and What is necessary is just to connect using a nut.

As the height of the tubular structure 6 comprising the temporary closing member 4 gradually increases, the height of the tubular structure 6 increases.
An appropriate amount of water is appropriately poured into the opening of the temporary closing member 4 located at the uppermost layer (the part opened upward leading to the internal cavity 11), and the upper end of the tubular structure 6 from the water surface The height is adjusted so that it is kept almost constant by buoyancy. Thereby, the tubular structure 6 can be gradually sunk downward, and the work of stacking the temporary closing members 4 one by one on the upper surface of the tubular structure 6 is always performed from the water surface 15 in a predetermined manner. Height.

When the lower end of the tubular structure 6 comprising the temporary closing members 4 reaches the bottom of the water and no longer sinks below, the operation of stacking the temporary closing members 4 is stopped. Thus, as shown in FIG. 3, the temporary closing structure 23 is completed. In the temporary closing structure 23, the grounding attachment 8 at the lower end is embedded in the mud 24 at the bottom of the water, and the upper end, that is, the upper surface of the temporary closing member 4 on the uppermost layer is appropriately positioned above the water surface 15. It is constructed as protruding by height. The water area surrounded by the temporary closing structure 23 is the temporary closing structure 23.
It is a closed water area without a communication path with the water area outside.

Next, as shown in FIG. 3, a work table 25 is built on the upper surface of the temporary closing structure 23 in order to drain water existing in a region surrounded by the tubular temporary closing structure 23. Then, the drainage device 26 is placed on the work table 25. The drainage device 26 includes a suction device 27, a suction pipe 28, a sand settling tank 29, and a drain pipe 30. To drain, first, footing 1
The water is sucked and pumped upward by a suction device 27 and a suction tube 28 connected to the suction device 27 which are sunk downward until the sand comes in contact with the water. The water is supplied to the temporary closing structure 23 by the drain pipe 30.
To the outside of the The area surrounded by the temporary closing structure 23 is drained once, and if a dry state as shown in FIG. 4 appears, the brush portion 7a of the muddy water intrusion prevention device 7
However, since it contacts the vertical wall of the footing 10 to prevent infiltration of muddy water from below, it is possible to maintain the working environment formed around the pier 3 under dry conditions.

When the water depth at the location where the temporary closing structure 23 is constructed is large and the water pressure from outside the temporary closing structure 23 is large, the outer wall of the temporary closing structure 23 is It is only necessary to take measures such as extending a rope with an anchor diagonally between the mud 24 at the bottom of the water.

After the repair work on the pier 3 is completed, the temporary closing structure 23 may be removed by performing the removing operation in the reverse order of the method of constructing the temporary closing structure 23. That is,
First, the suction device 27 of the drainage device 26 is connected to the temporary closing structure 23.
, The drain pipe 30 is directed toward the working space inside the temporary closing structure 23, and the temporary closing structure 23 is placed in a region (working space) surrounded by the temporary closing structure 23. Pour water until it is almost at the same height as the water surface around. Next, the drainage device 26 and the worktable 25 are removed, and the drainage device 2 is removed.
6 is stopped near the temporary closing structure 23,
Cavity 11 of temporary closing member 4 constituting temporary closing structure 23
(Refer to FIG. 5) The water existing inside is gradually pumped up and drained. Then, the temporary closing structure 23 rises upward, so if the temporary closing members 4 are sequentially removed from above,
Finally, all the temporary closing members 4 can be collected.

FIGS. 7 and 8 show the case where the water depth is large and the cross section of the pier 31 is large (distance from the upper surface of the footing to the water surface: 15 m, width of the pier in the longitudinal direction: 25 m, width of the pier in the lateral direction). : 5m). Temporary deadline structure 32
Is constructed by connecting a number of temporary closing members 4 on the footing 33 horizontally and vertically at an appropriate distance from the vertical wall of the pier 31. The construction procedure is the same as in the case of FIGS. Temporary deadline structure 32
In order to prevent water from entering from outside, a water-stopping material such as underwater concrete is poured between the temporary closing member 4 located at the lowermost layer and the upper surface of the footing 33, thereby providing a watertight structure. What is necessary is just to form.

When the temporary closing structure of the present invention is constructed around the footing (foundation) of a building (a pier, etc.), the water-blocking auxiliary device shown in FIG. Water can be prevented from entering.
Hereinafter, a structure for preventing water from entering will be described.

First, a guide rail 41 is attached to the outer surface of the inner wall portion 40 (the wall portion on which the working space is formed) of the temporary closing member 4.
Is fixed. In FIG. 9, the guide rails 41 have a T-shaped cross section, and are arranged on the surface of the temporary closing member 4 so as to extend in the vertical direction in a state of two parallel. When the temporary closing members 4 are stacked in the vertical direction, the guide rails 41 are continuously and linearly extended in the vertical direction and joined.

On the other hand, the water-blocking auxiliary device 42 is shown in FIGS.
As shown in FIG. 3, a sliding portion 43 having a structure slidable along the guide rail 41 and a width substantially equal to the width of the temporary closing member 4 (for example, about 1500 to 2000 mm) are provided. A base portion 44 fixed to the moving portion 43, a hard rubber contact portion 45 having substantially the same width dimension as the temporary closing member 4 and making contact with a footing (not shown); A telescopic part 4 interposed between the base part 44 and the contact part 45 for adjusting the thickness.
6 and a locking portion 47 that can be stored in the base portion 44. The expansion and contraction portion 46 is configured by, for example, a simple cylinder, and is in a normal state (a state (a) in FIG. 13).
Therefore, as long as the predetermined maximum dimension is not exceeded, the state can be changed to an extended state (state (b) in FIG. 13) by an arbitrary length until it comes into contact with the footing.
For example, as shown in FIG. 11, the locking portion 47 is provided with the water-blocking auxiliary device 42 so as not to hinder the installation of the two sliding portions 43.
Is provided near the center in the width direction. The locking portion 47 is provided with elastic means such as a spring, and is normally in a state shown in FIG. 13B, and is stored in the base portion 44 by being pushed from the outside. The total thickness of the base part 44, the elastic part 46, and the contact part 45 is, for example, 150 mm in the elastic part 46.
By performing expansion and contraction within the range, the size can be adjusted to an arbitrary size within the range of 200 to 350 mm.

FIG. 14 shows a state where the water-blocking auxiliary device 42 is submerged in water and is brought into contact with the footing 49 of the building 48. In FIG. 14, a guide rail 41 is provided on the outer surface of the inner wall portion 40 of the temporary closing structure 6 which is constructed in a tubular shape at an appropriate distance (for example, about 20 to 40 cm) from the footing 49 of the building 48. It extends vertically. Guide rail 41
After fitting the guide rail 41 and the sliding portion 43 of the water-shielding auxiliary device 42 at the upper end of the guide rail 41, the water-shielding auxiliary device 42 is slid downward along the guide rail 41. When the water-blocking auxiliary device 42 reaches the position of the temporary closing member 4 at the lowermost end, the locking portion 47 of the water-blocking auxiliary device 42 moves to the inner wall portion 4.
From the state in which it is stored in the base portion 44 in contact with the inner wall portion 40, it comes out of contact with the inner wall portion 40 and projects, and is brought into contact with the lower surface of the lowermost temporary closing member 4 and locked. .
In this state, the water-blocking auxiliary device 42 does not move upward even if it receives water pressure or the like from below because the locking portion 47 is in contact with the temporary closing member 4. Then, if the extendable portion 45 is extended until the contact portion 45 contacts the footing 49, the temporary closing structure 6 and the footing 4
9 can be completely filled and water can be prevented from entering from below. Thereafter, if water existing between the temporary closing structure 6 and the building 48 is drained, a work space under dry conditions can be formed around the building 48.

An adjusting section (adjusting plate) for adjusting the thickness, instead of the expandable section 46 and the abutting section 45 of the water shielding auxiliary device 42.
It is also possible to prevent water from penetrating by filling the space below the water-blocking auxiliary device 42 with a water-blocking material for the gaps that cannot be filled by the adjusting unit. In this case, as shown in FIG.
The distance between the footing 49 and the footing 49 is measured, and the water-blocking auxiliary device 51 is submerged in water so as to have a thickness slightly smaller than the distance. The auxiliary device 51 for water blocking includes a sliding portion 52,
It comprises a base part 53 and an adjustment part (adjustment panel) 54 having a predetermined adjusted thickness. The distance between the adjusting section 54 and the footing 49 is adjusted to be, for example, 100 mm or less. Thereafter, a predetermined liquid 56
(For example, two kinds of liquid materials which expand by mixing and become foamed resin) are supplied below the water-shielding auxiliary device 51, and the liquid material 56 reacts to form a water-blocking material 57 made of foamed resin. , It is possible to prevent water from entering from below. Typical examples of the liquid material 56 include a liquid containing a polyisocyanate component and a liquid containing a polyol component. If these two liquids are supplied in separate tubes and mixed below the water-blocking auxiliary device 51, they rapidly foam and harden into a rigid polyurethane foam. In order to supply the two kinds of liquids smoothly, as shown in FIG. 15, a guide path through which a pipe (hose) can be easily introduced may be formed as a cavity in the temporary closing member 4. . In addition, also in the structure shown in FIG. 14, the water blocking material 57 shown in FIG. 15 can be applied as an additional means.

The corner portion of the temporary closing structure 6 may be provided with the corner water-blocking auxiliary device 61. The corner-section water-impedance assisting device 61 is not provided with the elastic portion 45 as shown in FIG. Adjustment panel). That is, at the corner of the temporary closing structure 6,
As shown in FIG. 16, the temporary closing structure 6 and the footing 49
The thickness of the gap between them (the dimension shown as "a" in the figure)
And the thickness dimension of the gap perpendicular to the gap (dimension “b” in the figure) usually does not match, so that the L-shaped base 6
Along with 2, the adjusting section (adjusting panel) 63 is mounted on the larger dimension (the one indicated as “a” in the figure) so as to be adjusted so that the thickness of the gap becomes, for example, 100 mm or less. Then, by filling the space below the corner water-impedance assisting device 61 with a water-impervious material, the space that cannot be filled by the corner water-impedance assisting device 61 can be prevented from entering water from below. I just need.

The temporary closing method according to the present invention is applicable not only to repair work such as winding a reinforcing material around an existing pier,
The present invention can also be used when newly constructing a pier or when newly constructing, expanding, or repairing various underwater buildings other than the pier.

[0041]

According to the temporary closing method of the present invention, it is possible to easily connect a box-shaped temporary closing member to a desired temporary closing member while performing a water injection operation without using a special tool or the like. A temporary closing structure having a size and a shape can be completed. Also, the work of removing the temporary deadline structure after construction can be easily performed only by performing the reverse procedure of the work of constructing the temporary deadline structure. Therefore, the temporary closing method of the present invention is extremely useful as a construction method for forming a work space under a dry condition at a desired place in water.

[Brief description of the drawings]

FIG. 1 is a front view showing a first step in a temporary closing method according to the present invention.

FIG. 2 is a front view showing a second step in the temporary closing method according to the present invention.

FIG. 3 is a front view showing a third step in the temporary closing method according to the present invention.

FIG. 4 is a front view illustrating an example of a temporary closing structure completed by the temporary closing method of the present invention.

FIG. 5 is a perspective view showing an example of a temporary closing member used in the present invention.

FIG. 6 is a view showing an example of means for connecting temporary closing members in a horizontal direction.

FIG. 7 is a front view showing another construction example according to the present invention.

8 is a view in the direction of the arrow showing a state cut along the line AA in FIG. 7;

FIG. 9 is a perspective view for explaining a method of mounting the auxiliary device for waterproofing.

FIG. 10 is a front view of a water-blocking auxiliary device.

FIG. 11 is a rear view of the auxiliary device for waterproofing.

FIG. 12 is a plan view of an auxiliary device for waterproofing.

FIG. 13A is a side view showing the water shielding auxiliary device in a state in which the locking portion is stored and the expansion and contraction portion is not extended, and FIG. 13B is a side view showing the locking portion protruding and the expansion and contraction portion. It is a side view which shows the auxiliary | assistant device for water shielding in the state which extended.

FIG. 14 is a vertical cross-sectional view showing a state in which the water-blocking auxiliary device attached to the temporary closing structure comes into contact with a footing of a building (pier).

FIG. 15 is a longitudinal sectional view showing a state in which a water blocking material is filled below a water blocking auxiliary device attached to the temporary closing structure.

FIG. 16 is a cross-sectional view showing a position where a corner water impermeable auxiliary device is installed.

FIG. 17 is a front view showing an example of a conventional construction method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Road 2 Beam part 3 Bridge pier 4 Temporary closing member 5 Positioning device 6 Ring-shaped structure 7 Muddy water intrusion prevention device 8 Grounding mounting device 9 Concrete pillar 10 Footing 11 Hollow portion 12 Connecting means 13 Sliding pin 14 Cylinder mechanism 21 Ship Reference Signs List 22 Crane 23 Temporary shutoff structure 24 Water bottom 25 Workbench 26 Drainage device 27 Suction device 28 Suction pipe 29 Sedimentation tank 30 Drainage pipe 31 Bridge pier 32 Temporary shutoff structure 33 Footing 40 Inner wall 41 Guide rail 42, 51 43, 52 Sliding part 44, 53, 62 Base part 45 Contact part 46 Elastic part 47 Locking part 48 Building 49 Footing 54, 63 Adjusting part 55 Tube 56 Liquid material 57 Water-blocking material (foam resin) 61 Corner Water impervious auxiliary equipment 4a, 4b Frame 4c, 4d, 4e Plate 4f, 4g Reinforcement 7a Brush 7b Jack part 101 Bridge pier 102 Beam part 103 Bracket 104 Fixed frame 105 Circular rail 106 Winding device 107 Closing member 108 Mounting ring

Claims (8)

[Claims] 1. A work space under a dry condition suitable for construction after a temporary cutoff structure consisting of a cylindrical wall is installed in water and water in an area surrounded by the temporary cutoff structure is drained. A temporary cutoff construction method for producing an outer wall portion, an inner wall portion facing the outer wall portion, and a plurality of temporary cutoff members having a hollow portion existing between the outer wall portion and the inner wall portion, A step (A) of annularly connecting the outer wall portion and the inner wall portion to form a wall extending in a vertical direction and floating in water so that the inner wall portion is located on the side of the work space; For the temporary closing member connected to the temporary closing member having an outer wall portion and an inner wall portion similar to the above, and a hollow portion having an open contact surface with the adjacent temporary closing member, the temporary closing member is sequentially stacked. At the same time as constructing a cylindrical structure And water injection into the cavity of the provisional deadline members constituting the granulated material, the upper end of the tubular structure is always
Adjusted to have an appropriate height above the water surface, when the cylindrical structure finally touches the ground in water,
A step (B) of stopping the operation of stacking the temporary closing members to complete the temporary closing structure, and a step (C) of draining water existing in a region surrounded by the temporary closing structure. Temporary deadline construction method. 2. In the temporary closing method in which the temporary closing structure is installed around a footing of a building to be worked, the temporary closing method is performed between the step (B) and the step (C). Next step, that is, using a temporary closing member having a guide rail extending in a vertical direction on the outer surface of the inner wall portion, filling a gap between the temporary closing structure and the footing. The guide rail, which is extended and joined linearly in the vertical direction by stacking the temporary closing member, with a water-blocking auxiliary device having a telescopic portion provided so as to be able to expand and contract and a locking portion. When the water-blocking auxiliary device reaches the position of the lowermost temporary closing member, the locking portion of the water-shielding auxiliary device is moved to the lowermost temporary position. With the lower end of the shut-off member 2. The provisional deadline according to claim 1, further comprising a step of extending an expandable / contractible portion of the auxiliary device for waterproofing to contact the auxiliary device for waterproofing with the footing to prevent water from entering from below. Construction method. 3. The temporary closing method according to claim 1, wherein the temporary closing structure is installed around a footing of a building to be subjected to the construction, wherein the temporary closing structure is provided between the step (B) and the step (C). The next step, namely, using a temporary closing member provided with a guide rail extending in the vertical direction on the outer surface of the inner wall portion, and slightly less than the distance between the temporary closing structure and the footing The water-impedance auxiliary device having a small thickness and having a locking portion is slid downward along the guide rails which are linearly extended in the vertical direction by stacking the temporary closing members and joined. When the water-blocking auxiliary device reaches the position of the lowermost temporary closing member, the locking portion of the water-shielding auxiliary device is locked to the lower end of the lowermost temporary closing member. And the above-mentioned auxiliary equipment for impermeable The temporary closing work method according to claim 1, further comprising a step of filling a water blocking material below the space to prevent water from entering from below. 4. In a corner portion of the temporary closing structure formed by connecting the temporary closing members to each other substantially vertically in a horizontal direction, between the step (B) and the step (C). The next step, that is, a corner portion having a thickness slightly smaller than the distance between the temporary closing structure and the footing, and a corner portion having a locking portion, The temporary closing member forming the corner is slid downward along the guide rail which is extended in a straight line in the vertical direction and joined together, and the water shielding auxiliary device for the corner is located at the lowermost end. When the position of the temporary closing member is reached, the locking portion of the corner portion water-blocking auxiliary device is locked to the lower end of the lowermost temporary closing member and the lower portion of the corner portion water-blocking auxiliary device is Further comprising the step of filling with a water barrier material to prevent water from entering from below. Provisional deadline construction method described in 2 or 3. 5. A temporary closing structure installed as a cylindrical wall in water, wherein the temporary closing member, which is a constituent unit of the temporary closing structure, is constructed by connecting in a horizontal direction and a vertical direction. The temporary closing member includes an outer wall portion extending in a vertical direction for preventing water from entering from outside, an inner wall portion extending in a vertical direction opposite to the outer wall portion, and the outer wall portion; A temporary closing structure having a cavity between the inner walls, wherein water is stored in the cavity of the temporary closing member in a state where the cavities of the temporary closing member are communicated with each other. 6. The temporary closing structure installed around a footing of a building to be constructed, wherein the temporary closing member includes a guide rail extending vertically on an outer surface of the inner wall portion. And the guide rail is linearly extended in the vertical direction across the plurality of temporary shutoff members stacked in the vertical direction and joined, and the guide rail of the lowermost temporary shutoff member is provided. In addition, a water-shielding auxiliary device having a telescopic portion provided so as to be able to expand and contract so as to be able to fill a gap between the temporary closing structure and the footing, and a locking portion, 6. The temporary closing structure according to claim 5, wherein the temporary closing structure is attached in a state of being locked to a lower end of a lowermost temporary closing member and in contact with the footing. 7. The temporary closing structure installed around a footing of a building to be constructed, wherein the temporary closing member includes a guide rail extending vertically on an outer surface of the inner wall portion. And the guide rail is linearly extended in the vertical direction across the plurality of temporary shutoff members stacked in the vertical direction and joined, and the guide rail of the lowermost temporary shutoff member is provided. The auxiliary device for water shielding having a thickness slightly smaller than the distance between the temporary closing structure and the footing, and having a locking portion, connects the locking portion to the lowermost temporary closing member. The temporary closing structure according to claim 5, wherein the temporary closing structure is attached to a lower end in a state of being locked, and a water blocking material is filled under the auxiliary device for water blocking. 8. A corner of the temporary closing structure, wherein the temporary closing members are connected to each other substantially vertically in a horizontal direction, wherein a lower end of the temporary closing member forming a corner of the temporary closing structure is provided. A guide rail has a thickness slightly smaller than a distance between the temporary closing structure and the footing, and a corner water-blocking auxiliary device having a locking portion is provided to temporarily lock the locking portion at the lowermost temporary closing position. The temporary shutoff structure according to claim 6, wherein the temporary shutoff structure is attached to a lower end of the member in a state of being locked, and is filled with a waterproof material below the corner waterproofing device.