JP7199161B2 - Method for constructing cutoff wall structure, hollow segment for constructing cutoff wall structure, scaffold attached to hollow segment, and cutoff wall structure with scaffold - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for constructing a cutoff wall structure, a hollow segment for constructing the cutoff wall structure, a scaffold attached to the hollow segment, and a cutoff wall structure including the scaffold.

Conventionally, when reinforcing and repairing structures such as bridge piers built in water such as rivers, rivers, harbors and seawalls built along the coast, In order to secure a dry work space, it is necessary to construct a cutoff wall using a cofferdam (see Patent Document 1, for example).

JP 2011-58172 A

By the way, in order to construct the water stop wall cw around the pier, a segment plate sp made of steel is used to form the wall portion of the water stop wall cw. These segment plates sp are loaded on barges and, as shown in FIG. 15(a), are lifted by lifting machines cm installed at bridge piers bl on the water and lowered into the water. The water stop wall cw is assembled by connecting or fixing the segment plates sp placed in water to each other by a diving operator (hereinafter referred to as "diver").
Construction of such a cutoff wall cw requires a large machine such as a lifting machine cm, and most of the construction work must be done underwater by divers. The underwater work by the divers must be continued over the entire circumference of the pier bl and until the cutoff wall cw emerges from the water surface in the height direction, which places a heavy burden on the divers performing the underwater work. .
After forming a dry work space ws by draining the water between the pier and the cutoff wall cw to perform work such as reinforcement and repair of the pier bl, the worker removes the water from the cutoff wall cw. You must descend into the workspace ws. Therefore, as shown in FIG. 15(b), after the water is discharged from between the water stop wall cw and the bridge pier bl, it is necessary to build a scaffolding wf on the inner wall side of the water stop wall cw.
As described above, the construction work of the conventional water stop wall cw required the installation work of the scaffolding wf on the water stop wall cw in addition to the work by divers, and the work load was heavy.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and provides a method for constructing a cutoff wall structure capable of reducing the work load and construction equipment at the time of construction, and a hollow segment for constructing the cutoff wall structure. , a scaffold attached to the hollow segment and a cutoff wall structure with the scaffold.

In order to solve the above problems, according to the present invention, hollow segments having internal spaces defined by wall surfaces are connected in the horizontal direction and the vertical direction to stop water between a structure at least partially submerged in water. A step (A) of installing a scaffold on the side of the hollow segment floating on the water surface forming the outer wall and the inner wall of the water stop wall structure. and a step (B) of stacking and connecting another hollow segment to the hollow segment on which the scaffold is installed on the scaffold.

The method further comprises a step (C) of, after repeating the steps (A) and (B) to stack the hollow segments up to a predetermined height, injecting a liquid into the internal space of the lowermost hollow segment. is preferred.

Furthermore, in order to solve the above problems, according to the present invention, a water cutoff wall structure that secures a watertight space between a structure that is at least partially submerged is constructed, and an internal space is defined by a wall surface. The defined hollow segment is formed with mounting portions for attaching scaffolding for construction work of the water stop wall structure on the outer side forming the outer wall and the inner side forming the inner wall of the water stopping wall structure. It is characterized by

Furthermore, in order to solve the above problems, according to the present invention, a water cutoff wall structure that secures a watertight space between a structure that is at least partially submerged is constructed, and an internal space is defined by a wall surface. A scaffolding releasably attached to a defined hollow segment for engaging attachments formed on the exterior of said hollow segment forming the outer wall and the interior forming the inner wall of said cutoff wall structure. It is characterized by having a joint.

Furthermore, in order to solve the above-mentioned problems, according to the present invention, hollow segments connected in the horizontal direction and the vertical direction and having an internal space defined by a wall surface, and a hollow segment detachably attached to the hollow segments are provided. a scaffolding comprising: said hollow segment having mounting portions for mounting said scaffolding on an outer side forming an outer wall and an inner side forming an inner wall; said scaffolding and said mounting portion formed in said hollow segment; It is characterized by having an engaging portion for engagement.

It is also preferred to provide steps between the scaffolds in longitudinally adjacent hollow segments.

According to the present invention, it is possible to reduce the work load and construction equipment at the time of construction.

1 is a schematic diagram of a cutoff wall structure according to an embodiment of the present invention; FIG. FIG. 4 is a diagram for explaining the configuration of rectangular segments of hollow segments that construct a water cutoff wall structure; FIG. 4 is a diagram for explaining the configuration of connecting segments of hollow segments that construct a water cutoff wall structure; FIG. 10 is a diagram for explaining the configuration of rectangular segments of other hollow segments that construct the water cutoff wall structure; FIG. 10 is a diagram for explaining the configuration of connecting segments of other hollow segments that construct the water cutoff wall structure; FIG. 10 is a schematic diagram showing a scaffold attached to a hollow segment; FIG. 4 is a diagram for explaining the configuration of a scaffold; FIG. 6 is a view showing a state in which pipe members are attached to the hollow segments shown in FIGS. 2 to 5 of the cutoff wall structure; FIG. 2 is a schematic plan view of a cutoff wall structure; It is a figure for demonstrating the construction method of a cutoff wall structure. It is a figure for demonstrating the construction method of a cutoff wall structure. It is a figure for demonstrating the construction method of a cutoff wall structure. It is a figure which cuts and shows a part of cutoff wall structure. FIG. 11 is a diagram for explaining the configuration of a scaffolding according to a modified example; It is the schematic which shows the construction process of the conventional waterproof wall.

Preferred embodiments of the present invention will be described with reference to the drawings. It should be noted that the embodiment shown below is an example, and various embodiments can be made within the scope of the present invention.

FIG. 1 is a schematic diagram of a cutoff wall structure according to this embodiment. FIG. 2 is a see-through perspective view showing a rectangular segment of a hollow segment with the inside visible, (a) is a perspective view of the rectangular segment viewed from the outer plate side, and (b) is a rectangular segment viewed from the inner plate. Fig. 3 is a perspective view seen from the side; FIG. 3 is a see-through perspective view showing the connecting segments of the hollow segments with the inside visible, (a) is a perspective view of the connecting segments as seen from the outer plate side, and (b) is a perspective view of the connecting segments viewed from the inner plate. Fig. 3 is a perspective view seen from the side; FIG. 4 is a see-through perspective view showing a rectangular segment of another hollow segment in which the inside can be seen, (a) is a perspective view of the rectangular segment as seen from the outer plate side, and (b) is the rectangular segment. It is the perspective view seen from the inner plate side. FIG. 5 is a see-through perspective view showing the connecting segment of another hollow segment with the inside visible, (a) is a perspective view of the connecting segment as seen from the outer plate side, and (b) is the connecting segment. It is the perspective view seen from the inner plate side. FIG. 6 is a schematic diagram showing the scaffolding attached to the hollow segment. FIG. 7 is a diagram for explaining the configuration of the scaffold. FIG. 8 is a diagram showing a state in which pipe members are attached to the hollow segments shown in FIGS. 2 to 5 of the cutoff wall structure.

<Water stop wall structure>
For example, as shown in FIG. 1, the cut-off wall structure 100 forms a work space ws around the pier bl when reinforcing or repairing the pier bl erected in water such as a river or the sea. Therefore, it is formed surrounding the bridge pier bl. The cutoff wall structure 100 is assembled in a cylindrical shape by stacking a plurality of annular structures (connecting bodies) 1 in the height direction h with respect to the cutoff wall structure 100 and connecting them to each other.
Scaffolds 27 are provided along the circumferential direction of each annular structure 1, and steps 27l are provided between the scaffolds 27 of adjacent annular structures 1 in the height direction h (see FIG. 13). . Workers can go back and forth between scaffolds 27 at different heights via stairs 27l.

[Cyclic structure]
The annular structure 1 includes an annular structure 1A positioned at the bottom of the cutoff wall structure 100 in the height direction h, and an annular structure 1B stacked and connected to the annular structure 1A in the height direction h. and
The annular structure 1A is configured to have a rectangular shape in plan view by connecting hollow segments 10A in the lateral direction l. The annular structure 1B is configured to have a rectangular shape in a plan view by connecting the hollow segments 10B in the horizontal direction l.
The hollow segment 10A includes a substantially rectangular parallelepiped rectangular segment 2 and a connecting segment 4 connecting the rectangular segments 2 at a corner portion C so as to form a right angle with each other. The hollow segment 10B includes a substantially rectangular parallelepiped rectangular segment 6 and a connecting segment 8 connecting the rectangular segments 6 at corners C so as to form a right angle with each other.
For convenience of explanation, the length direction (horizontal direction) of the rectangular segments 2 and 6 and the connecting segments 4 and 8 is "l", the height direction (longitudinal direction) is "h", and the width direction (thickness direction) is Let it be "w".

As shown in FIG. 2, the rectangular segment 2 of the hollow segment 10A has an internal space S1 defined by a wall surface. The rectangular segment 2 includes three outer plates 21 forming the outer wall of the water cutoff wall structure 100, three inner plates 22 forming the inner wall of the water cutoff wall structure 100, the outer plates 21 and the inner and walls covering the space between the plates 22 .
The walls include an upper plate 23 that covers the rectangular segment 2 from above in the height direction h, a lower plate 24 that covers from the lower side, and two lateral plates that cover the rectangular segment 2 from the sides in the length direction l. plate 25;
The rectangular segment 2 is formed like a box with a hollow internal space S1 defined by an outer plate 21, an inner plate 22, an upper plate 23, a lower plate 24, and a side plate 25. As shown in FIG. The rectangular segment 2 further has two partition plates (partition walls) 26 that partition the internal space S1 perpendicularly to the height direction h. The rectangular segment 2 is equally divided into three internal spaces S1, and the internal spaces S1 are connected to each other.

The outer plate 21 has a rectangular shape in plan view, and is a so-called liner plate formed of a straight steel sheet pile having a wavy portion formed by curving a steel plate into a wavy shape, for example. The wavy portion is formed to undulate in the thickness direction w along the height direction h.
The outer plates 21 are arranged along the height direction h.

Each inner plate 22 is arranged to face each outer plate 21 in parallel. The inner plate 22 is rectangular in plan view, and is, for example, a so-called liner plate formed of a straight steel sheet pile having a wavy portion formed by bending a steel plate into a wavy shape. The wavy portion is formed to undulate in the thickness direction w along the height direction h.
The inner plate 22 arranged at the highest position in the height direction h is formed with a communication portion that allows a fluid such as air to flow between the outside of the rectangular segment 2 and the internal space S1 of the rectangular segment 2. . The flow section includes a flow port (not shown) formed in the inner plate 22 and a hose or the like attached to the flow port for supplying air from the outside to the internal space S1. and a connection member V1 to which the pipe member T1 (see FIG. 8) is connected. A known valve member having an air supply/exhaust valve function is used as the connection member V1.
When the connection member V1 is opened, the outside and the internal space S1 are communicated, and air can be supplied from the outside to the internal space S1, and air can be discharged (exhausted) from the internal space S1 to the outside. . When the connection member V1 is closed, the communication between the outside and the internal space S1 is cut off, and the supply of air from the outside to the internal space S1 is prevented.
In the inner plate 22 arranged at the lowest position in the height direction h, there is formed a flow-through portion that allows a fluid such as water (liquid) to flow between the outside of the rectangular segment 2 and the internal space S1 of the rectangular segment 2. It is The flow section includes a flow port (not shown) formed in the inner plate 22 and a hose or the like attached to the flow port for supplying water from the outside to the internal space S1. and a connection member V2 to which the pipe member T2 (see FIG. 8) is connected. A known valve member having a water supply/drainage valve function is used for the connection member V2.
When the connection member V2 is opened, the outside and the internal space S1 are communicated with each other, allowing water to be injected from the outside into the internal space S1 and allowing water to be discharged (drained) from the internal space S1 to the outside. If the connection member V2 is closed, the communication between the outside and the internal space S1 is cut off, and the inflow and outflow of water from the outside to the internal space S1 is prevented.

The upper plate 23 is made of a rectangular steel plate in a plan view, and covers the space between the outer plate 21 and the inner plate 22 from above in the height direction h. The upper plate 23 extends along the outer plate 21 and the inner plate 22 in the length direction l, and protrudes from the outer plate 21 and the inner plate 22 by a predetermined length in the width direction w. The upper plate 23 is welded with the outer plate 21 and the inner plate 22 along the longitudinal direction l.
A plurality of through holes 23a are formed at equal intervals along the length direction l in the projecting portion of the upper plate 23 projecting from the outer plate 21 and the inner plate 22 by a predetermined length in the width direction w. A bolt (not shown) for connecting the rectangular segment 2 and a rectangular segment 6 or a connecting segment 8 to be superimposed on the rectangular segment 2, which will be described later, is inserted through the through hole 23a.
Mounting holes (mounting portions) 23b for mounting the scaffolding 27 are formed in portions of the projecting portion where the through holes 23a are not formed, for example, between adjacent through holes 23a. The mounting holes 23b are formed at predetermined intervals from each other.

The lower plate 24 is made of a rectangular steel plate in plan view, and covers the space between the outer plate 21 and the inner plate 22 from below in the height direction h. The lower plate 24 extends along the outer plate 21 and the inner plate 22 in the length direction l, and protrudes from the outer plate 21 and the inner plate 22 in the width direction w by a predetermined length. The lower plate 24 is welded with the outer plate 21 and the inner plate 22 along the longitudinal direction l.
A plurality of through holes 24a are formed at equal intervals along the length direction l in the projecting portion of the lower plate 24 projecting from the outer plate 21 and the inner plate 22 by a predetermined length in the width direction w. A bolt (not shown) for connecting a water stop plate (not shown) to the rectangular segment 2 is inserted through the through hole 24a.
Mounting holes (mounting portions) 24b for mounting the scaffolding 27 are formed in portions of the projecting portion where the through holes 24a are not formed, for example, between adjacent through holes 24a. The mounting holes 24b are formed at predetermined intervals from each other. The mounting hole 24b is formed at a position aligned with the mounting hole 23b in the upper plate 23 in the height direction h.

The side plate 25 is formed of a steel plate having a rectangular shape in plan view, and covers the space between the outer plate 21 and the inner plate 22 from the side (horizontal direction l side). The side plates 25 extend along the outer plate 21 and the inner plate 22 in the height direction h, and protrude from the outer plate 21 and the inner plate 22 in the width direction w by a predetermined length. The side plate 25 is welded to the outer plate 21 and the inner plate 22 along the height direction h.
A plurality of through holes 25a are formed at equal intervals along the height direction h in the portion of the side plate 25 that protrudes from the outer plate 21 and the inner plate 22 by a predetermined length in the width direction w. A bolt (not shown) for connecting the rectangular segment 2 and the connecting segment 4 and the rectangular segment 2 adjacent to the rectangular segment 2 in the lateral direction l is inserted through the through hole 25a.

The partition plate 26 is made of a rectangular steel plate in a plan view. The partition plate 26 is provided between a pair of the outer plate 21 and the inner plate 22 that are adjacent in the height direction h and face each other. The rectangular segment 2 has an internal space S1 divided into three equal parts by two partition plates 26 .
The partition plate 26 extends along the outer plate 21 and the inner plate 22 in the length direction l, and has protruding portions that protrude from the outer plate 21 and the inner plate 22 in the width direction w by a predetermined length. The partition plate 26 is welded to the outer plate 21 and the inner plate 22 along the length direction l and welded to the side plates 25 along the width direction w.
The partition plate 26 is formed with through holes 26a for connecting (communicating) the divided internal spaces S1. The positions and number of through holes 26a are not particularly limited.
Two mounting holes (mounting portions) 26b are formed in the projecting portion of the partition plate 26 for mounting the scaffolding 27 thereon. Mounting holes 26b of the projecting portion are formed at positions aligned with the mounting holes 23b and 24b in the upper plate 23 and the lower plate 24, respectively.

As shown in FIG. 3, the connecting segment 4 is L-shaped in a plan view and connects the rectangular segments 2 that are in a positional relationship orthogonal to each other. The connecting segment 4 has an internal space S2 defined by a wall surface. The connection segment 4 includes six outer plates 41 forming the outer wall of the water cutoff wall structure 100, six inner plates 42 forming the inner wall of the water cutoff wall structure 100, the outer plates 41 and the inner and walls covering the space between the plates 42 .
The walls include an L-shaped upper plate 43 that covers the connecting segment 4 from above in the height direction h, a lower plate 44 that covers the connecting segment 4 from below, and an L-shaped lower plate 44 that covers the connecting segment 4 from the side. It has two side plates 45 covering from the bottom.
The connecting segment 4 is formed into an L-shaped box shape in plan view with a hollow internal space S2 defined by an outer plate 41, an inner plate 42, an upper plate 43, a lower plate 44, and a side plate 45. As shown in FIG. The connecting segment 4 further has two partition plates (partition walls) 46 that partition the internal space S2 perpendicularly to the height direction h. The connecting segment 4 is equally divided into three internal spaces S2, and the internal spaces S2 are connected to each other.

The outer plate 41 has three first plates 47 and three second plates 48. The first plates 47 and the second plates 48 are connected to each other through connecting members so as to form a right angle. there is The first plate 47 is elongated with respect to the second plate 48 .
Each first plate 47 is rectangular in plan view, and is, for example, a so-called liner plate formed of a straight steel sheet pile having a wavy portion formed by bending a steel plate into a wavy shape. The wavy portion is formed to undulate in the width direction w along the height direction h.
Each first plate 47 is arranged along the height direction h.

Each second plate 48 is rectangular in plan view, and is a so-called liner plate formed of a straight steel sheet pile having a wavy portion formed by bending a steel plate into a wavy shape. The wavy portion is formed to undulate in the width direction w along the height direction h.
Each second plate 48 is arranged along the height direction h.

Each inner plate 42 is arranged to face each outer plate 41 in parallel. The inner plate 42 includes three first plates 49 and three second plates 50, and the first plates 49 and the second plates 50 are connected to each other at right angles through connecting members. there is The first plate 49 is elongated with respect to the second plate 50 .

Each first plate 49 is rectangular in plan view, and is, for example, a so-called liner plate formed of a straight steel sheet pile having a wavy portion formed by bending a steel plate into a wavy shape. The wavy portion is formed to undulate in the width direction w along the height direction h.
Each first plate 49 is arranged along the height direction h.
Each second plate 50 has a rectangular shape in plan view, and is a so-called liner plate formed of a straight steel sheet pile having a wavy portion formed by curving a steel plate into a wavy shape, for example. The wavy portion is formed to undulate in the width direction w along the height direction h.
Each second plate 50 is arranged along the height direction h.
The first plate 49 arranged at the highest position in the height direction h is formed with a communication portion that allows a fluid such as air to flow between the outside of the connecting segment 4 and the internal space S2 of the connecting segment 4. there is The flow section includes a flow port (not shown) formed in the first plate 49 and a hose or the like attached to the flow port for supplying air from the outside to the internal space S2. and a connection member V1 to which the pipe member T1 of is connected. A known valve member having an air supply/exhaust valve function is used as the connection member V1.
When the connection member V1 is opened, the outside and the internal space S2 are communicated, and air can be supplied from the outside to the internal space S2, and air can be discharged (exhausted) from the internal space S2 to the outside. . When the connection member V1 is closed, the communication between the outside and the internal space S2 is cut off, and the supply of air from the outside to the internal space S2 is prevented.
Note that the connection member V1 may be provided on the second plate 50 instead of the first plate 49 .

The first plate 49 arranged at the lowest position in the height direction h has a flow-through portion that allows a fluid such as water (liquid) to flow between the outside of the connecting segment 4 and the internal space S2 of the connecting segment 4. formed. The flow section includes a flow port (not shown) formed in the first plate 49 and a hose or the like attached to the flow port for supplying water from the outside to the internal space S2. and a connection member V2 to which the pipe member T2 of is connected. A known valve member having a water supply/drainage valve function is used for the connection member V2.
When the connection member V2 is opened, the outside and the internal space S2 are communicated with each other, allowing water to be injected from the outside into the internal space S2 and allowing water to be discharged (drained) from the internal space S2 to the outside. . When the connection member V2 is closed, the communication between the outside and the internal space S2 is cut off, and the inflow and outflow of water from the outside to the internal space S2 is prevented.
Note that the connection member V2 may be provided on the second plate 50 instead of the first plate 49 .

The upper plate 43 is formed of an L-shaped steel plate in plan view, and covers the space between the outer plate 41 and the inner plate 42 from above in the height direction h. Upper plate 43 extends along first plate 47 and second plate 48 of outer plate 41 and first plate 49 and second plate 50 of inner plate 42 and extends from outer plate 41 and inner plate 42 . It protrudes by a predetermined length in the width direction w. The upper plate 43 is welded to the uppermost outer plate 41 and inner plate 42 .
A plurality of through-holes 43a are formed at equal intervals along the length direction l in the projecting portion of the upper plate 43 projecting from the outer plate 41 and the inner plate 42 by a predetermined length in the width direction w. A bolt (not shown) for connecting the connecting segment 4 and a rectangular segment 6 and a connecting segment 8 which are superimposed on the connecting segment 4 (described later) is inserted through the through hole 43a.
Mounting holes (mounting portions) 43b for mounting the scaffolding 27 are formed in portions of the projecting portion where the through holes 43a are not formed, for example, between adjacent through holes 43a. The mounting holes 43b are formed at predetermined intervals from each other.

The lower plate 44 is formed of an L-shaped steel plate in plan view, and covers the space between the outer plate 41 and the inner plate 42 from below in the height direction h. Lower plate 24 extends along first plate 47 , second plate 48 of outer plate 41 , first plate 49 and second plate 50 of inner plate 42 and extends from outer plate 41 and inner plate 42 . It protrudes by a predetermined length in the width direction w. The lower plate 44 is welded to the outer plate 41 and the inner plate 42 provided below.
A plurality of through-holes 44a are formed at equal intervals along the length direction l in the projecting portion of the lower plate 44 projecting from the outer plate 41 and the inner plate 42 by a predetermined length in the width direction w. A bolt (not shown) for connecting a water stop plate (not shown) is inserted through the through hole 44a.
Mounting holes (mounting portions) 44b for mounting the scaffolding 27 are formed in portions of the projecting portion where the through holes 44a are not formed, for example, between adjacent through holes 44a. The mounting holes 44b are formed at predetermined intervals from each other. The mounting hole 44b is formed at a position aligned with the mounting hole 43b in the upper plate 43 in the height direction h.

The side plate 45 is made of a rectangular steel plate in plan view, and covers the space between the outer plate 41 and the inner plate 42 from the side. The side plates 45 extend along the outer plate 41 and the inner plate 42 in the height direction h, and protrude from the outer plate 41 and the inner plate 42 in the width direction w by a predetermined length. The side plate 45 is welded to the outer plate 41 and the inner plate 42 along the height direction h.

A plurality of through-holes 45a are formed at equal intervals along the height direction h in the projecting portions of the side plates 45 projecting from the outer plate 41 and the inner plate 42 by a predetermined length in the width direction w. A bolt (not shown) is inserted through the through hole 45a for connecting the rectangular segments 2 that are adjacently connected in the length direction l.

The partition plate 46 is formed of an L-shaped steel plate in plan view. The partition plate 46 is provided between a pair of the outer plate 41 and the inner plate 42 that are adjacent in the height direction h and face each other. The connecting segment 4 has an internal space S2 divided into three equal parts by two partition plates 46 .
The partition plate 46 extends along the longitudinal direction l along the first plate 47 and the second plate 48 of the outer plate 41 and the first plate 49 and the second plate 50 of the inner plate 42, It has protruding portions that protrude from the plate 41 and the inner plate 42 in the width direction w by a predetermined length. The partition plate 46 is welded to the outer plate 41 and the inner plate 42 along the length direction l, and welded to the side plates 45 along the width direction w.
The partition plate 46 is formed with through holes 46a for connecting (communicating) the divided internal spaces S2. The positions and number of through holes 46a are not particularly limited.
A mounting hole (mounting portion) 46b for mounting the scaffolding 27 is formed in the projecting portion. The mounting holes 46b of the projecting portion are formed at positions aligned with the mounting holes 43b and 44b in the upper plate 43 and the lower plate 44, respectively.

As shown in FIG. 4, the rectangular segment 6 of the hollow segment 10B has an internal space S3 defined by a wall surface. The rectangular segment 6 includes two outer plates 61 forming the outer wall of the water cutoff wall structure 100, two inner plates 62 forming the inner wall of the water cutoff wall structure 100, the outer plates 61 and the inner and walls covering the space between the plates 62 .
The walls include an upper plate 63 that covers the rectangular segment 6 from above in the height direction h, a lower plate 64 that covers from the lower side, and two lateral plates that cover the rectangular segment 6 from the sides in the length direction l. plate 65;
The rectangular segment 6 is formed like a box with a hollow internal space S3 defined by an outer plate 61, an inner plate 62, an upper plate 63, a lower plate 64, and a side plate 65. As shown in FIG. The rectangular segment 6 further has one partition plate (partition wall) 66 that partitions the internal space S3 perpendicularly to the height direction h. Although the rectangular segment 6 is equally divided into two internal spaces S3, the internal spaces S3 are connected to each other.

The outer plate 61 has a rectangular shape in a plan view, and is a so-called liner plate formed of a straight steel sheet pile having a wavy portion formed by bending a steel plate into a wavy shape, for example. The wavy portion is formed to undulate in the thickness direction w along the height direction h.
The outer plates 61 are arranged along the height direction h.

Each inner plate 62 is arranged to face each outer plate 61 in parallel. The inner plate 62 is rectangular in plan view, and is, for example, a so-called liner plate formed of a straight steel sheet pile having a wavy portion formed by bending a steel plate into a wavy shape. The wavy portion is formed to undulate in the thickness direction w along the height direction h.
The inner plates 62 are arranged along the height direction h.
The inner plate 62 arranged highest in the height direction h has a connecting member V1, and the inner plate 62 arranged lowest in the height direction h has a connecting member V2. Each connecting member V1, V2 has the same function as the connecting member V1, V2 in the rectangular segment 2. FIG. The inner plate 62 has the same configuration as the inner plate 22 of the rectangular segment 2 .

The upper plate 63 is made of a rectangular steel plate in plan view, and covers the space between the outer plate 61 and the inner plate 62 from above in the height direction h.
The rectangular segment 6 and the rectangular segment 6 overlapping the rectangular segment 6 are formed in the through hole 63a formed in the projecting portion of the upper plate 63 projecting from the outer plate 61 and the inner plate 62 by a predetermined length in the width direction w. Alternatively, a bolt (not shown) for connecting with the connecting segment 8 is inserted.
Mounting holes (mounting portions) 63b for mounting the scaffolding 27 are formed between the adjacent through holes 63a. The mounting holes 63b are formed at predetermined intervals from each other. The upper plate 63 has the same configuration as the upper plate 23 of the rectangular segment 2 .

The lower plate 64 is made of a rectangular steel plate in plan view, and covers the space between the outer plate 61 and the inner plate 62 from above in the height direction h.
A through hole 64a formed in a projecting portion of a lower plate 64 projecting from the outer plate 61 and the inner plate 62 by a predetermined length in the width direction w includes a rectangular segment 6 and a rectangular segment 6 below the rectangular segment 6. A bolt (not shown) for connecting the segments 2, 6 or the connecting segments 4, 8 is inserted.
Mounting holes (mounting portions) 64b for mounting the scaffolding 27 are formed between the adjacent through holes 64a. The mounting holes 64b are formed at predetermined intervals from each other. The lower plate 64 has the same configuration as the lower plate 24 of the rectangular segment 2 .

The side plate 65 is formed of a steel plate having a rectangular shape in plan view, and covers the space between the outer plate 61 and the inner plate 62 from the side (horizontal direction l side).
A through hole 65a formed in a projecting portion of a side plate 65 projecting from the outer plate 61 and the inner plate 62 by a predetermined length in the width direction w includes the rectangular segment 6 and the rectangular segment 6 in the lateral direction l. A bolt (not shown) for connecting the adjacent rectangular segment 6 and connecting segment 8 is inserted. The side plates 65 have the same configuration as the side plates 25 of the rectangular segment 2 .

The partition plate 66 is made of a rectangular steel plate in a plan view. The partition plate 66 is provided between a pair of the outer plate 61 and the inner plate 62 that are adjacent in the height direction h and face each other. The rectangular segment 6 has an internal space S3 that is divided into two by one partition plate 66 . The partition plate 66 is formed with through holes 66a for connecting (communicating) the divided internal spaces S3. The positions and number of through holes 66a are not particularly limited.
A mounting hole (mounting portion) 66b for mounting the scaffolding 27 is formed in a projecting portion of the partition plate 66 that projects from the outer plate 21 and the inner plate 22 by a predetermined length in the width direction w. The mounting holes 66b are formed at predetermined intervals from each other. The mounting holes 66b are formed at positions aligned with the mounting holes 63b and 64b in the upper plate 63 and the lower plate 64, respectively. The partition plate 66 has the same configuration as the partition plate 26 of the rectangular segment 2 .

As shown in FIG. 5, the connecting segment 8 is L-shaped in a plan view and connects the rectangular segments 6 that are in a mutually orthogonal positional relationship. The connecting segment 8 has an internal space S4 defined by a wall surface. The connection segment 8 includes four outer plates 81 forming the outer wall of the water cutoff wall structure 100, four inner plates 82 forming the inner wall of the water cutoff wall structure 100, the outer plates 81 and the inner and walls covering the space between the plates 82 .
The walls include an L-shaped upper plate 83 that covers the connecting segment 8 from above in the height direction h, a lower plate 84 that covers the connecting segment 8 from below, and an L-shaped lower plate 84 that covers the connecting segment 8 from the side. It has two side plates 85 covering from the bottom.
The connecting segment 8 is formed like a box with a hollow internal space S4 defined by an outer plate 81, an inner plate 82, an upper plate 83, a lower plate 84 and a side plate 85. As shown in FIG. The connecting segment 8 further has one partition plate (partition wall) 86 that partitions the internal space S4 perpendicularly to the height direction h. The connecting segment 8 is equally divided into two internal spaces S4, and the internal spaces S4 are connected to each other.

The outer plate 81 has two first plates 87 and two second plates 88. The first plates 87 and the second plates 88 are connected to each other through connecting members so as to form a right angle. there is The first plate 87 is elongated with respect to the second plate 88 .
Each of the first plate 87 and the second plate 88 has a rectangular shape in a plan view. is a plate. The wavy portion is formed to undulate in the width direction w along the height direction h. The outer plate 81 has the same configuration as the outer plate 41 of the connecting segment 4 . The outer plate 81 has the same configuration as the outer plate 41 of the connecting segment 4 .

The inner plate 82 has two first plates 89 and two second plates 90, and the first plates 89 and the second plates 90 are connected to each other at right angles via connecting members. . The first plate 89 is elongated with respect to the second plate 90 .
Each of the first plate 89 and the second plate 90 has a rectangular shape in plan view, and is formed of a straight steel sheet pile having a wavy portion formed by bending a steel plate into a wavy shape, for example, a so-called liner. is a plate. The wavy portion is formed to undulate in the width direction w along the height direction h.

Each inner plate 82 is arranged to face each outer plate 81 in parallel. The inner plate 82 has a connecting member V1 on a first plate 89 arranged on the upper side in the height direction h, and a connecting member V2 on the first plate 89 arranged on the lower side in the height direction h. Each connecting member V1, V2 has the same function as the connecting member V1, V2 in the connecting segment 4. FIG. The inner plate 82 has the same configuration as the inner plate 42 of the connecting segment 4 .
The connecting member V1 and the connecting member V2 may be provided on the second plate 90 instead of the first plate 89. FIG.

The upper plate 83 is formed of an L-shaped steel plate in plan view, and covers the space between the outer plate 81 and the inner plate 82 from above in the height direction h.
A through hole 83a formed in a protruding portion of an upper plate 83 that protrudes from the outer plate 81 and the inner plate 82 by a predetermined length in the width direction w includes a connecting segment 8 and a rectangular segment 6 overlapping the connecting segment 8. Alternatively, a bolt (not shown) for connecting with the connecting segment 8 is inserted. Upper plate 83 has the same configuration as upper plate 43 of connecting segment 4 .
Mounting holes (mounting portions) 83b for mounting the scaffolding 27 are formed in portions of the projecting portion where the through holes 83a are not formed, for example, between adjacent through holes 83a. The mounting holes 83b are formed at predetermined intervals from each other. Upper plate 83 has the same configuration as upper plate 43 of connecting segment 4 .

The lower plate 84 is formed of an L-shaped steel plate in plan view, and covers the space between the outer plate 81 and the inner plate 82 from below in the height direction h. Lower plate 84 has the same configuration as lower plate 44 of connecting segment 4 .
A through-hole 84a formed in a protruding portion of a lower plate 84 that protrudes from the outer plate 81 and the inner plate 82 by a predetermined length in the width direction w includes a connecting segment 8 and a rectangular lower side of the connecting segment 8. A bolt (not shown) for connecting the segments 2, 6 or the connecting segments 4, 8 is inserted.
Mounting holes (mounting portions) 84b for mounting the scaffolding 27 are formed in portions of the projecting portion where the through holes 84a are not formed, for example, between adjacent through holes 84a. The mounting holes 84b are formed at predetermined intervals from each other. Lower plate 84 has the same configuration as lower plate 44 of connecting segment 4 .

The side plate 85 is made of a rectangular steel plate in a plan view, and covers the space between the outer plate 81 and the inner plate 82 from the side (lateral direction l side).
A through hole 85a formed in a protruding portion of a side plate 85 protruding from the outer plate 81 and the inner plate 82 by a predetermined length in the width direction w includes the connecting segment 8 and the connecting segment 8 in the lateral direction l. A bolt (not shown) for connecting adjacent rectangular segments 6 is inserted. The side plates 85 have the same configuration as the side plates 45 of the connecting segment 4 .

The partition plate 86 is formed of an L-shaped steel plate in plan view. The partition plate 86 is provided between a pair of the outer plate 81 and the inner plate 82 that are adjacent to each other in the height direction h and face each other. The connecting segment 8 has an internal space S4 that is divided into two by one partition plate 86 . The partition plate 86 is formed with through holes 86a for connecting (communicating) the divided internal spaces S4. The positions and number of through-holes 86a are not particularly limited.
A mounting hole (mounting portion) 86b for mounting the scaffolding 27 is formed in a protruding portion of the partition plate 86 that protrudes from the outer plate 81 and the inner plate 82 by a predetermined length in the width direction w. The mounting holes 86b are formed at predetermined intervals from each other. The partition plate 86 has the same configuration as the partition plate 46 of the connecting segment 4 .

As shown in Figure 6, a scaffold 27 is attached to each rectangular segment 2,6 and connecting segment 4,8. Workers overlap and connect the rectangular segments 2 , 6 and the connecting segments 4 , 8 on the scaffold 27 .
It should be noted that scaffolding 27 is attached to arbitrarily selected rectangular segments 2,6 and connecting segments 4,8. Also, the scaffolds 27 attached to the sides of the outer plates 21, 41, 61, 81 and the inner plates 22, 42, 62, 82 are not limited to being provided at the same positions as shown in FIG. The scaffolds 27 may be attached at different height positions on the outer plates 21, 41, 61, 81 and the inner plates 22, 42, 62, 82, respectively.

As shown in FIG. 7, the scaffolding 27 includes a steel cloth plate portion 27a on which a worker sits, and outer plates 21, 41, 61, 81 or inner plates 22 at both ends in the length direction l of the cloth plate portion 27a. , 42, 62, 82, and a fence portion 27c provided on the opposite side of the cloth plate portion 27a to the engaging portion 27b.
The cloth plate portion 27a includes a pair of steel support members 27a1 extending in the length direction l, three steel support members 27a2 connecting the support members 27a1 in the width direction w, the support members 27a1, and a plate member 27a3, such as expanded metal, placed on the plate member 27a2.

Engagement portions 27b for attaching the scaffolding 27 to the hollow segments 10A and 10B are provided at both end portions in the length direction l of one support member 27a1. The engaging portion 27b extends in a direction (height direction h) orthogonal to the plate member 27a3. Both ends of the engaging portion 27b are provided with protruding portions 27b1 protruding at right angles to the side opposite to the cloth plate portion 27a. A cylindrical member 27b2 made of steel is attached to the surface of each projecting portion 27b1 facing downward in the height direction h.
The upper cylindrical member 27b2 and the lower cylindrical member 27b2 form upper plates 23, 43, 63, 83, lower plates 24, 44, 64, 84 and partition plates 26 in the rectangular segments 2, 6 and connecting segments 4, 8. , 46, 66, 86 are inserted from above by appropriately selecting mounting holes 23b, 43b, 63b, 83b; 24b, 44b, 64b, 84b;

A fence portion 27c is provided on the other support member 27a1. The fence portion 27c is composed of a pair of frame members 27c1 each having one end connected to the support member 27a1 or the support member 27a2 and extending upward in the height direction h, and connecting the frame members 27c1 to each other in the length direction l. It has two frame members 27c2.
In the scaffolding 27, reinforcing members 27d are provided between the supporting members 27a2 and the engaging portions 27b at both ends in the length direction l of the cloth plate portion 27a.

As shown in FIG. 8, in a state in which the rectangular segments 2 and 6 and the connecting segments 4 and 8 are connected to each other in the length direction l to form the circular structures 1A and 1B, the circular structures 1A and 1B are formed in the circumferential direction. Two tube members T1, T2 are provided along.
The pipe member T1 includes a plurality of connecting portions T1a that are detachably connected to the connecting members V1 attached to the flow portions, and at least one supply/discharge portion T1b that communicates with the outside and enables air intake and exhaust. have.
The pipe member T2 has a plurality of connecting portions T2a that are detachably connected to the connecting members V2 attached to the flow portions, and at least one water supply/discharge portion T2b that communicates with the outside and enables water supply and drainage. are doing.

The side plates 25, 65 of the rectangular segments 2, 6 and the side plates 45, 85 of the connecting segments 4, 8, which are adjacent to each other in the height direction h, are offset in the circumferential direction of the annular structures 1A, 1B. position. That is, the vertically adjacent rectangular segments 2, 6 and connecting segments 4, 8 are arranged in a zigzag pattern.

<Method of constructing water stop wall structure>
Next, a method for constructing and dismantling the cutoff wall structure 100 according to the embodiment of the present invention will be described with reference to FIGS. 9 to 12. FIG. FIG. 9 is a schematic plan view of a cutoff wall structure according to an embodiment of the present invention. 10 to 12 are diagrams for explaining a method for constructing and dismantling a cutoff wall structure according to an embodiment of the present invention.
For example, when reinforcing or repairing a bridge pier bl erected in water such as a river or sea, it is necessary to temporarily secure a dry work space ws around the pier bl. A temporary construction method for securing a work space ws is generally called an underwater cofferdam or a temporary cofferdam, and is particularly called a cofferdam construction method in the present invention. The cutoff wall structure 100 is used in the cofferdam construction method.
In general, the cutoff wall structure 100 formed by the cofferdam construction method has sufficient resistance to static water pressure due to surrounding water, flowing water pressure due to water flow, wave pressure due to waves, etc. Strength and waterproof performance are required.
As shown in FIG. 9, before constructing the cutoff wall structure 100, a vertical steel frame 9 is driven into the water bottom around the pier bl with a predetermined gap from the pier bl. Next, a strut 91 is installed between the vertical frame 9 and the pier bl.

Next, first, the rectangular segment 2 and the connecting segment 4 are lowered onto the water surface wl from the barge loaded with the hollow segments 10A and 10B. Each internal space S1, S2 of the rectangular segment 2 and the connecting segment 4 is densely configured with respect to the outside. That is, even if the rectangular segment 2 and the connecting segment 4 are lowered onto the water surface wl, the rectangular segment 2 and the connecting segment 4 remain floating without being completely submerged.
Note that the rectangular segment 2 and the connecting segment 4, which are first lowered onto the water surface wl, maintain a state in which they partially float above the water surface wl due to their own buoyancy, so the scaffolding 27 may not be attached.

The rectangular segment 2 and the connecting segment 4 lowered on the water surface wl are connected to each other in the lateral direction 1 so as to surround the bridge pier bl to construct the annular structure 1A. Specifically, the operator brings the side plates 25, 45 of the plurality of rectangular segments 2 and the connecting segments 4 floating on the water surface wl into contact with each other so that the through holes 25a, 45a are aligned with each other. By inserting bolts through the holes 25a and 45a and fastening nuts to the bolts, the rectangular segment 2 and the connecting segment 4 adjacent to each other in the lateral direction l are connected.
Here, the pipe member T1 is connected to the connection member V1 of each flow section provided on the inner plates 22 and 42 of the rectangular segment 2 and the connecting segment 4 of the annular structure 1A, and the connection member V2 of each flow section is connected to the pipe member T1. Connect the pipe member T2. It should be noted that illustration of the pipe members T1 and T2 is omitted in FIGS.

Next, on the annular structure 1A floating on the water surface wl, the rectangular segments 6 and the connecting segments 8 are stacked and connected to the annular structure 1A, and connected in the horizontal direction l to form the annular structure 1B. To construct.
The connection of the rectangular segment 6 and the connecting segment 8 to the annular structure 1A consists of through holes 23a and 43a in the upper plates 23 and 43 of the rectangular segment 2 and connecting segment 4, and the lower plates 64 and 64 of the rectangular segment 6 and connecting segment 8. This is done by aligning the through holes 64a, 84a in 84, inserting bolts, and attaching nuts.
Here, the rectangular segment 6 and the connecting segment 8 on the circular structure 1A are installed at opposing positions on the circular structure 1A so that the circular structure 1A does not tilt due to the weight of the rectangular segment 6 and the connecting segment 8. It is preferable to continue

The rectangular segments 6 and connecting segments 8 connected to the annular structure 1A are aligned with the adjacent rectangular segments 6 and connecting segments 8 in the through holes 65a and 85a of the side plates 65 and 85, respectively. By inserting bolts through the mutually aligned through holes 65a and 85a and fastening nuts to the bolts, the rectangular segments 6 and connecting segments 8 adjacent in the lateral direction l are connected to each other to construct the annular structure 1B. Thereby, the cyclic structure 1B is connected to the cyclic structure 1A.
Here, the connecting members V1 provided on the inner plates 62 and 82 of the rectangular segment 6 and the connecting segment 8 are also connected to the pipe members T1, and the connecting members V2 are also connected to the pipe members T2.

Next, as shown in FIG. 10(a), outer plates 21, 21 are attached to arbitrarily selected rectangular segments 2; Attach the scaffold 27 on the side of 41, 61, 81 and inner plates 22, 42, 62, 82 (step (A)). For example, of the two upper and lower columnar members 27b2 in the height direction h of the two left and right engaging portions 27b in the length direction l of the scaffolding 27, the lower columnar member 27b2 is replaced with the upper plate of the rectangular segment 2 and the connecting segment 4 23, 43 and the mounting holes 61b, 81b of the lower plates 64, 84 of the rectangular segment 6 and the connecting segment 8, and the upper cylindrical member 27b2 is inserted into (engaged with) the rectangular segment 6 and the connecting segment. It is inserted (engaged) into the attachment holes 66b, 86b of the partition plates 66, 86 of the segment 8.

As shown in FIG. 10(b), another rectangular segment 6 and connecting segment 8 are stacked on the annular structure 1B to which the scaffolding 27 is attached and connected in the lateral direction l to construct the annular structure 1B. . An operator gets on the scaffold 27 and connects the rectangular segments 6 and the connecting segments 8 from the outer plates 61, 81 and the inner plates 62, 82 (step (B)).

As shown in FIG. 11(a), another cyclic structure 1B is constructed on the cyclic structure 1B constructed by repeating the above steps (A) and (B). When the annular structural bodies 1B are stacked over a plurality of stages, the annular structural bodies 1B are in a floating state due to the air present in the internal spaces S3 and S4. In this state, some of the annular structures 1B reach a predetermined height above the water surface wl. The “predetermined height” is, for example, a height at which work space (a space for stacking the annular structures 1) cannot be secured above the water surface wl by the stacked annular structures 1B, or a height at which construction work is performed at height. It is.

In order to secure the work space, as shown in FIG. 11B, the rectangular segment 2 is connected to the connecting member V2 of the rectangular segment 2 and the connecting segment 4 in the annular structure 1A through the supply/discharge portion T2b of the pipe member T2. and water wa is injected from the outside into the connecting segment 4 (step (C)).

The internal spaces S1 divided by the partition plates 26 of the rectangular segments 2 are connected to each other by the through holes 26a, and the internal spaces S2 divided by the partition plates 46 of the connecting segments 4 are connected to each other by the through holes 46a. Therefore, the internal spaces S1 and S2 of each rectangular segment 2 and connecting segment 4 are filled with water wa. The air in the internal spaces S1 and S2 is discharged to the outside through the supply/discharge portion T1b of the pipe member T1.
The annular structure 1A sinks in water due to the weight of the rectangular segments 2 and the connecting segments 4 and the weight of the water wa. As the cyclic structure 1A sinks, the cyclic structure 1B connected in an overlapping manner also sinks, and the cyclic structure 1B above the water surface wl sinks in the water. Thus, a new working space is formed on the water surface wl.

Again, when the annular structures 1B are stacked up to a height where the work space cannot be secured, as shown in FIG. form again. This operation is repeated until the water stop plates attached to the lower plates 24, 44 of the annular structure 1A reach the bottom of the water or the footing of the pier bl.
Finally, as shown in FIG. 12(b), all the rectangular segments 6 and connecting segments 8 whose inner spaces S3 and S4 are not filled with water wa are filled with water (step (D)). As a result, the cutoff wall structure 100 as a whole is filled with water wa.

After the construction of the cutoff wall structure 100, the water wa in the inner space of the cutoff wall structure 100 formed to surround the pier bl with a gap therebetween is drained by a pump or the like, thereby removing the water around the pier bl. provide a working space ws of a dry space. Thus, the cutoff wall structure 100 is constructed.
After the work space ws is secured, the stairs 27l are installed at predetermined positions in the circumferential direction of the cutoff wall structure 100 between the scaffolds 27 adjacent in the height direction h. This allows movement to scaffolds 27 installed at different height positions.
The pipe members T1 and T2 may remain attached to the cutoff wall structure 100 when the working space ws of the dry space is secured, and the water wa is pumped to secure the working space ws. In the process of draining water by, for example, it may be removed from each connection member V1, V2 as appropriate.

Since the scaffolding 27 attached at the time of construction is still attached to the inner wall side of the cutoff wall structure 100, the worker uses the scaffolding 27 to create a working space ws secured as a dry space, The repair work of the pier bl is carried out while moving freely up, down, left and right.

Utilizing the work space ws, the cutoff wall structure 100 is dismantled after the reinforcement/repair work of the bridge pier bl is completed. After the water wa is introduced into the work space ws, the water is removed from the cutoff wall structure 100 to the annular structure 1B in order. If the pipe members T1 and T2 have been removed, the pipe members T1 and T2 are attached to the connecting members V1 and V2.
First, air is fed from the outside into the internal spaces S3 and S4 of the rectangular segment 6 and the connecting segment 8 of the annular structure 1B through the supply/discharge portion T1b of the pipe member T1, and the water wa in the internal spaces S3 and S4 is discharged. is discharged to the outside through the pipe member T2 (or the flow section). If the internal spaces S3 and S4 are communicated with the outside via the supply/discharge portion T1b of the pipe member T1, the water wa in the internal spaces S3 and S4 is discharged via the pipe member T2 (or the communication portion). You may make it suck and drain outside.
By repeating this operation a predetermined number of times, the mutually connected annular structures 1A and 1B begin to float.

Next, the rectangular segment 6 and the connecting segment 8 in the annular structure 1B that has floated above the water surface wl are released from their connected states, and the rectangular segment 6 and the connecting segment 8 are removed. By removing the rectangular segment 6 and the connecting segment 8, another annular structure 1B emerges from the water above the water surface wl. When this operation is repeated and the annular structure 1B does not float, air is again injected into the annular structure 1B to drain the water wa in the internal spaces S3 and S4 to the outside.

Finally, the water wa is discharged from the internal spaces S1 and S2 of the rectangular segments 2 and the connecting segments 4 that form the circular structure 1A, the circular structure 1A is lifted, and the rectangular segments 2 and the connecting segments 2 and the connecting segments 4 are discharged on the water surface wl. The dismantling of the cutoff wall structure 100 is completed by removing the segments 4 after releasing the mutual connection state.

According to the water cutoff wall structure 100 as described above, the outer plates 21, 41, 61, 81 and the inner plates 22, 42, 62, 82 of the rectangular segments 2, 6 and the connecting segments 4, 8 floating on the water surface have Since the scaffolding 27 is attached to it, the worker can connect the rectangular segments 2, 6 and the connecting segments 4, 8 in the horizontal direction l and the height direction h on the water surface wl. As a result, the connection work that divers have conventionally performed underwater can be performed above water, so that the burden of construction work of the cutoff wall structure 100 can be reduced.
Further, the scaffolding 27 includes an engaging portion 27b, and mounting holes 23b, 24b, 26b; 43b, 44b, 46b; 63b, 64b, 66b; Since the scaffolding 27 is detachable from the scaffolding 27, the worker can appropriately install the scaffolding 27 at a required position and remove the unnecessary scaffolding 27 as appropriate.

As shown in FIG. 15(b), in the conventional water stop wall cw, after discharging the water between the pier bl and the water stop wall to secure a dry work space ws, the inner wall side of the water stop wall It was necessary to assemble the scaffold wf in
On the other hand, in the cutoff wall structure 100, as shown in FIG. can be used. Thus, after securing the work space ws, the worker can go down into the work space ws via the scaffolding 27 on the inner wall side.
Furthermore, since the scaffolding 27 is detachable from the rectangular segments 2, 6 and the connecting segments 4, 8, the assembled scaffolding 27 can be freely removed in consideration of workability. As a result, a worker can freely change the arrangement of the scaffolds 27 in the cutoff wall structure 100. For example, in the cutoff wall structure 100, the individual scaffolds 27 can be arranged in a spiral shape on the inner wall side. Easy to install.
Moreover, since the stairs 27l are provided between the scaffoldings 27 provided at different height positions, the cutoff wall structure 100 can be easily moved in the vertical direction, and the bridge piers bl need not be repaired. Can be easily moved into position.

Moreover, when constructing the water cutoff wall structure 100 by stacking the annular structure 1B on the annular structure 1A, the annular structure 1A (rectangular segment 2 and connecting segment 4) constructed on the water surface wl and the annular structure The ups and downs of 1B (rectangular segment 6 and connecting segment 8) can be adjusted appropriately above the water surface wl by injecting and discharging water or air. Thus, there is no need to temporarily install a large-scale scaffolding on the bridge pier bl, and a suspension machine for suspending the rectangular segments 2, 6 and the connecting segments 4, 8, and the working height from the water surface wl can always be adjusted. The connection (and disassembly) of the annular structures 1A and 1B can be performed at a low position above the water surface wl, specifically at a position lower than the water surface wl.
That is, by constructing the cutoff wall structure 100 by adjusting the ups and downs of the annular structures 1A and 1B while stacking each of the annular structures 1A and 1B, it is possible to avoid construction work at a high place. At the same time, it is possible to effectively utilize the limited work space on the water surface to perform the construction work.

Since the cutoff wall structure 100 is constructed using box-shaped hollow segments 10A (rectangular segments 2 and connecting segments 4) and hollow segments 10B (rectangular segments 6 and connecting segments 8), for example, a liner plate Compared to conventional cutoff walls, the strength against static water pressure, running water pressure, wave pressure, etc. is improved. As a result, the number of struts 91 that support the cutoff wall structure 100 from the inside can be reduced, and a wide working space ws can be ensured.

In addition, since the cutoff wall structure 100 is constructed using the annular structures 1A and 1B that are rectangular in plan view, the distance between the pier bl and the bridge pier bl is smaller than that of circular annular structures such as circular or elliptical shape in plan view. can ensure a large working space ws.

In addition, since the inner spaces S1 to S4 of the hollow segments 10A and 10B of all the annular structures 1A and 1B constructing the waterproof wall structure 100 are filled with water, the strength of the waterproof wall structure 100 is and stability can be easily increased.

<Modification>
A hollow segment 10C and a scaffolding 27A according to a modification will be described below with reference to FIG. The hollow segment 10C will be described based on the hollow segment 10B, and the same components as those of the hollow segment 10B will be given the same reference numerals, and detailed description thereof will be omitted. In addition, the configuration described later can also be applied to the hollow segment 10A.
A scaffolding 27A having a different structure from the scaffolding 27 in the above embodiment is attached to the hollow segment 10C. The hollow segment 10C has two shaft members 30a projecting toward the upper plates 63, 83 instead of the mounting holes 64b, 84b in the lower plates 64, 84. As shown in FIG. The hollow segment 10C has a pair of steel tubular members 30 (only one is shown) inserted through mounting holes 66b, 86b in the partition plates 66, 86 and fitted over the shaft member 30a.
The tubular member 30 has a pair of rotating members 31 rotatable around the axis of the tubular member 30 . In the hollow segment 10C, a pair of tubular members 30 and a pair of rotating members 31 serve as mounting portions for the scaffolding 27A.
The rotating member 31 has a rotating portion 31a that is rotatably attached in parallel to the tubular member 30, and a supporting portion 31b that extends perpendicularly to the rotating portion 31a.

The scaffolding 27A is assembled to the mounting portion. The scaffolding 27</b>A has a plate member 32 such as expanded metal made of steel that is bridged over the support portion 31 b and a fence member 33 that is attached to the rotating member 31 . The plate member 32 has an engagement portion that engages with the support portion 31b, and the plate member 32 is fixed to the support portion 31b by engaging the engagement portion with the support portion 31b.
The fence member 33 has the same structure as the fence portion 27c of the scaffolding 27, and is detachably attached to the end portion of the support portion 31b opposite to the rotating portion 31a.
Before the scaffolding 27A is assembled, the pivot member 31 is stored along the outer plates 61, 81 and the inner plates 62, 82 of the rectangular segment 6 and the connecting segment 8. As shown in FIG. When assembling the scaffolding 27A on the hollow segment 10C, after rotating each rotating member 31 outward, the plate member 32 is attached to the support portion 31b, and the fence member 33 is attached. When dismantling the scaffolding 27A, the plate member 32 and the fence member 33 are removed from the support portion 31b, and the rotating member 31 is rotated toward the outer plate 61 and the inner plate 62. As shown in FIG.

<Others>
It should be noted that the present invention is not limited to the above-described embodiments, and can be appropriately modified within the scope of the present invention. For example, in the above embodiment, the internal spaces S1 to S4 in the hollow segments 10A, 10B are separated by the partition plates 26, 46, 66, 86. The partition plates 26, 46, 66, 86 may not be provided if the strength against water pressure, running water pressure, wave pressure, etc. is sufficient.

Further, in the above embodiment, the internal spaces S1 to S4 in the respective hollow segments 10A, 10B are divided into a plurality of stages by the partition plates 26, 46, 66, 86, but each hollow segment 10A , 10B have sufficient strength against hydrostatic pressure, running water pressure, wave pressure, etc., the partition plates 26, 46, 66, 86 may not be provided.
Also, the outer plates 21, 41, 61, 81 and the inner plates 22, 42, 62, 82 in the rectangular segments 2, 6 and the connecting segments 4, 8 may be one. , 66, 86 are not provided. The dimensions of the hollow segments 10A, 10B in the height direction h are appropriately changed according to the number of outer plates 21, 41, 61, 81 and inner plates 22, 42, 62, 82.

Further, in the above embodiments, the flow passages are formed in the inner plates 22, 42, 62, 82, but may be formed in the outer plates 21, 41, 61, 81.

In addition, in the above-described embodiment, the annular structures 1A and 1B are provided with the pipe members T1 and T2, respectively. The supply/discharge portions T1b and T2b of the pipe members T1 and T2 may be directly attached to the members V1 and V2), respectively.

Further, in the above embodiment, the internal spaces S1-S4 in each of the rectangular segments 2, 6 and connecting segments 4, 8 are independent of each other. However, for example, the internal spaces S1 to S4 of the respective rectangular segments 2, 6 and the connecting segments 4, 8 connected in the lateral direction l are formed with through holes in the side plates 25, 45, 65, 85 to mutually Upper plates 23, 43, 63, 83 and lower plates 24, 44 connect the internal spaces S1 to S4 of the rectangular segments 2, 6 and the connecting segments 4, 8 connected in the height direction h. , 64 and 84 may be formed with through holes to communicate with each other.
In this case, the flow-through portions may be provided, for example, in the rectangular segments 2 and 6 and the connecting segments 4 and 8 facing each other in the circumferential direction of the annular structures 1A and 1B. This can prevent the annular structures 1A and 1B from excessively tilting to one side when water is poured into the internal spaces S1 to S4.

In addition, although not described in the above embodiment, packing members (not shown) are provided at the connecting portions between the rectangular segments 2 and 6 and the connecting segments 4 and 8 for the purpose of stopping water. ing. That is, in each of the rectangular segments 2, 6 and connecting segments 4, 8, the walls of the upper plates 23, 43, 63, 83, the lower plates 24, 44, 64, 84 and the side plates 25, 45, 65, 85 A packing member is attached to the

Further, in the above embodiment, the water wa is supplied to the internal spaces S1 to S4 of the hollow segments 10A and 10B through the pipe member T2, but liquids other than the water wa may be used. Specifically, any liquid whose apparent specific gravity as a whole of the hollow segments 2, 4, 6, 8 into which the liquid is injected is greater than the specific gravity of the water, seawater, or the like with which the cutoff wall structure 100 is constructed. Just do it.

In the above-described embodiment, the cutoff wall structure 100 is formed in a rectangular shape in a plan view by the annular structures 1A and 1B which are rectangular in a plan view. The shape is not limited to this, and may be, for example, a triangular shape or a polygonal shape of pentagon or more in plan view. In this case, the rectangular segments 2 and 6 and the connecting segments 4 and 8 may be appropriately changed in design according to the planar view shape of the cutoff wall structure 100 .

In the above embodiment, the cutoff wall structure 100 is formed of the annular structures 1A and 1B. , 10C may be formed in a U-shape or a C-shape in plan view with respect to the wharf structure.

1A, 1B Annular structures 2, 6 Rectangular segments 21, 61 Outer plates 22, 62 Inner plates 23, 63 Upper plates 23b, 63b Mounting holes (mounting portions)
24, 64 Lower plate 24b, 64b Mounting hole (mounting part)
25, 65 side plate 26, 66 partition plate 26b, 66b mounting hole (mounting portion)
27 Scaffolding 27l Stairs 27b Engaging parts 4, 8 Connecting segments 41, 81 Outer plates 42, 82 Inner plates 43, 83 Upper plates 43b, 83b Mounting holes (mounting parts)
44, 84 Lower plate 44b, 84b Mounting hole (mounting part)
45, 85 side plate 46, 86 partition plate 46b, 86b mounting hole (mounting portion)
10A, 10B Hollow segments S1, S2, S3, S4 Internal space wl Water surface ws Working space (water-stopped space)

Claims (6)

A method for constructing a waterproof wall structure that secures a waterproof space between a structure that is at least partially submerged by connecting hollow segments in which an internal space is defined by a wall surface in the horizontal and vertical directions. and
step (A) of installing scaffolds on the hollow segment floating on the water surface on the side forming the outer wall and the side forming the inner wall of the water stop wall structure;
A step (B) of stacking and connecting other hollow segments to the hollow segment on which the scaffold is installed on the scaffold;
A method for constructing a cutoff wall structure, comprising: After stacking the hollow segments up to a predetermined height by repeating the steps (A) and (B), a step (C) of injecting a liquid into the internal space of the lowermost hollow segment is provided. The method for constructing a cutoff wall structure according to claim 1. An internal space provided by a wall surface provided for constructing a water cutoff wall structure that secures a watertight space between a structure that is at least partially submerged, based on the method according to claim 1 or 2. is a hollow segment defining
A hollow segment, wherein mounting portions for mounting a scaffold for construction work of the water cutoff wall structure are formed on the outer side forming the outer wall and the inner side forming the inner wall of the water cutoff wall structure. An internal space provided by a wall surface provided for constructing a water cutoff wall structure that secures a watertight space between a structure that is at least partially submerged, based on the method according to claim 1 or 2. A scaffold removably attached to a hollow segment defining a
A cloth board on which workers ride,
a plurality of engaging portions provided on the cloth plate portion outside the hollow segment forming the outer wall and inside forming the inner wall of the waterproof wall structure and engaging with mounting portions formed in the hollow segment ;
a railing portion provided on the cloth plate portion on the side opposite to the engaging portion ;
The engaging portion includes an engaging portion provided above the cloth plate portion when engaged with the mounting portion, and an engaging portion provided below the cloth plate portion.
A scaffold detachably attached to a hollow segment characterized by: a connecting body configured by connecting in the horizontal direction and the vertical direction hollow segments having internal spaces defined by wall surfaces;
a scaffold detachably attached to the hollow segments constituting the longitudinally connected body;
with
The hollow segment has at least three projections projecting from and laterally along the outer plate forming the outer wall and projecting from the inner plate forming the inner wall and extending laterally along the inner plate. and at least three projecting portions extending in the longitudinal direction, the projecting portions being formed with attachment portions that enable attachment of the scaffolding, the upper projecting portion in the longitudinal direction of the at least three projecting portions and the The projecting portion on the lower side is used for connection with the hollow segment constituting the connecting body connected in the longitudinal direction,
The water cutoff wall structure, wherein the scaffolding has an engaging portion that engages with the mounting portion formed on the projecting portion of the hollow segment. 6. A water stop wall structure according to claim 5, comprising steps between said scaffoldings in longitudinally adjacent hollow segments.

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