JP7300841B2 - JOINT STRUCTURE OF DIAMOND WALL AND CONSTRUCTION METHOD OF DIAMOND WALL - Google Patents

Description

TECHNICAL FIELD The present invention relates to a diaphragm wall joint structure and a diaphragm wall construction method.

2. Description of the Related Art Conventionally, as a diaphragm wall such as an earth retaining wall, there is known a rigid joint that rigidly joins horizontal reinforcing bars that are connected to jointed steel plates as disclosed in Patent Document 1, for example.
In recent years, a diaphragm wall is required to have a transmission mechanism capable of transmitting shear force in the vertical direction. As a joint method for transmitting a vertical shear force, a method using a jointed steel plate joint in which a protruding angle member (protruding member) is installed on a partition steel plate is known. Specifically, the shear force in the vertical direction of the general portion is supported as a vertical load by the bearing pressure stress of the protruding member, and the load is transmitted to the partition plate via the welded portion with the partition plate. In addition, there is also a type in which the load is transmitted from the welded portion of the partition plate to the ridge member, and through the bearing force of the concrete, a wall-to-wall joint portion is provided to transmit the load as a vertical load to the general portion.

As a joint method between elements in such a diaphragm wall, first, a preceding excavation portion for constructing a preceding element is excavated every other section. Specifically, joint steel plate joints are installed inside adjacent pre-excavated sections that are excavated by skipping one section, reinforcing bar cages are erected, and concrete is poured to construct front-rear elements (preceding continuous walls). . At this time, the position of the welded steel plate joint is arranged at a position spaced apart from the right and left end faces of the preceding excavation portion by a predetermined distance. In other words, there is a state where unplaced portions are formed on both side portions of the preceding element.
Then, the trailing elements are constructed between the leading elements. Specifically, the portion remaining between the preceding excavated portions is excavated to form the subsequent excavated portion. As a result, the unplaced portion is connected to the trailing excavation portion to form an excavation space between the preceding elements. Then, a reinforcing bar cage is erected in this excavation space, and concrete is placed to construct a trailing element (a trailing continuous wall).

JP-A-11-269870

However, the conventional connecting method between elements in a diaphragm wall has the following problems.
In other words, in the conventional case, the uncut portion is excavated twice during excavation of the preceding excavation portion and during excavation of the subsequent excavation portion, so the amount of stabilizer used during excavation increases. In addition to the problems, the construction efficiency is also inefficient.

In addition, since the uncut portion remains uncut for a long time, there is a risk that the trench wall will collapse.
Furthermore, since there is an uncut portion, it is necessary to arrange, for example, a partition steel plate over the entire circumference to prevent concrete from leaking into the trailing excavation portion of the adjacent trailing element. Moreover, since it is necessary to integrate the reinforcing bar cage with the partition steel plate in the preceding excavation portion of the preceding element, there is room for improvement in this respect.

The present invention has been made in view of the above-mentioned problems, and can eliminate the need for a moat rest with a simple structure, can perform stable construction, and can improve construction efficiency. It is an object of the present invention to provide a diaphragm wall joint structure and a diaphragm wall construction method capable of reducing construction costs.

In order to achieve the above object, the joint structure for a diaphragm wall according to the present invention is a joint structure for a diaphragm wall that is arranged to join adjacent elements while transmitting shear force in the vertical direction. A fixed partition plate that is spaced apart from the joint surface of the other adjacent element in one of the elements, and a fixed partition plate that extends from both ends of the fixed partition plate toward the joint surface side of the other element. A connecting plate is separated from the fixed partition plate in the longitudinal direction, which is the direction in which the diaphragm wall extends in the lateral direction, and is detachably provided between projecting ends of the pair of connecting plates. and a partition plate, wherein projecting ends of the pair of connecting plates are in contact with excavation side surfaces facing each other in the wall thickness direction of the one element, and the fixed partition plate and reinforcing bars embedded in the element. and are not connected to each other, and at least one of the front and rear surfaces of the fixed partition plate is provided with a ridge extending in the horizontal direction .

Further, a method for constructing a diaphragm wall according to the present invention is a method for constructing a diaphragm wall using the above-described joint structure, wherein one of the adjacent elements to be joined is placed first. a step of excavating a portion for constructing an element to form a pre-excavated portion; a step of installing a joining plate joint having the movable partition plate; a step of incorporating a reinforcing bar into the preceding excavated portion; a step of pouring concrete into the preceding excavated portion; Excavating a portion to be constructed to form a trailing excavation portion; removing the movable partition after excavating the trailing excavation; and pouring concrete into the trailing excavation from which the movable partition has been removed. and a step of casting.

In the present invention, the preceding excavated portion of one preceding element is excavated, and a joint structure (joint structure) is provided with a fixed partition plate, a connecting plate, and a movable partition plate at the end of the preceding excavated portion on the side of the succeeding element, which is the joining side. plate joint) is arranged so that the movable partition plate is on the trailing element side. Next, after excavating the trailing excavation portion of the other trailing element, concrete is placed in the preceding excavation portion. At this time, since the protruding ends of the pair of connecting plates are in contact with the excavation side surfaces facing each other in the wall thickness direction of the preceding excavation, the cast concrete can be placed without leaking to the succeeding excavation. can be done.

Further, when excavating the trailing excavation section, the movable partition plate is attached, so that the excavated soil does not enter the space between the fixed partition plate and the movable partition plate. It is possible to prevent excavated soil from adhering to the trailing excavated portion. Therefore, by removing the movable partition plate after excavating the trailing excavation portion and pouring concrete into the trailing excavation portion, the concrete can be brought into close contact with the fixed partition plate for integration. As a result, the adjacent elements can be joined while transmitting a shear force in the vertical direction.

As described above, according to the present invention, it is possible to eliminate the need for an unexcavated portion and to carry out stable construction work by installing the joint plate joint having a simple structure in the pre-excavated portion. Therefore, construction efficiency can be improved, and construction costs can be reduced.

In addition , the vertical shear force between the concrete placed in the element and the fixed partition plate is supported by the bearing stress of the ridges provided on the fixed partition plate, and the vertical load is transmitted to the fixed partition plate. be able to. Therefore, it is possible to more reliably join the adjacent elements while transmitting the shear force in the vertical direction.

In the diaphragm wall joint structure according to the present invention, the connecting plate gradually extends outward in the wall thickness direction from both ends of the fixed partition plate toward the projecting end. is preferred.

In this case, the load due to the concrete placed in the excavated portion of the element can be released to the excavated side surface of the excavated portion while directing it outward in the wall thickness direction along the inclined connecting plate. Therefore, the load applied to the fixed partition plate can be kept small, the position and attitude of the fixed partition plate can be prevented from being deviated, and stable construction work can be performed.

In the diaphragm wall joint structure according to the present invention, a guide groove extending in the vertical direction is formed in the protruding end of the connecting plate, and the movable partition plate extends in the vertical direction along the guide groove. It may be characterized by being provided so as to be movable and detachable from the guide groove.

In the present invention, the movable partition plate can be moved upward along the guide groove by grasping the upper part of the movable partition plate and pulling it up. In this case, even if earth and sand adhere to the movable partition plate, it can be easily lifted up, and labor-intensive detachment work such as bolting is not required, and the partition plate can be easily removed from the connecting plate.

Further, in the joint structure for a diaphragm wall according to the present invention, the fixed partition plate is provided with reinforcing ribs projecting in a direction intersecting the surface direction of the fixed partition plate and extending in the vertical direction. may be characterized.

In this case, since the fixed partition plate is reinforced by the reinforcing ribs, the structure can withstand the load of the concrete placed in the excavated portion of the element, and stable construction can be performed.
Moreover, since the reinforcing rib protrudes from the fixed partition plate toward the excavated portion, it is possible to improve the adhesion with the concrete placed in the excavated portion, thereby achieving more reliable integration.
Moreover, in the joint structure of the diaphragm wall according to the present invention, it is preferable that the movable partition plate is a flat plate.

According to the diaphragm wall joint structure and the diaphragm wall construction method of the present invention, it is possible to eliminate the need for a moat rest with a simple structure, to perform stable construction, and to improve construction efficiency. Improvement can be aimed at and reduction of construction cost can be aimed at.

1 is a partially broken perspective view showing a construction state of a diaphragm wall according to an embodiment of the present invention; FIG. FIG. 4 is a perspective view showing the upper portion of the joint plate joint; FIG. 4 is a plan view of the joint plate joint viewed from above; FIG. 4 is a cross-sectional view taken along the line AA shown in FIG. 3, which is a longitudinal cross-sectional view of the upper portion of the joint plate joint; (a) to (c) are diagrams showing a construction procedure for a diaphragm wall. 5(a) to 5(c) are diagrams showing the construction procedure of the diaphragm wall following FIG. 5(c).

Hereinafter, a diaphragm wall joint structure and a diaphragm wall construction method according to an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the joint structure of the diaphragm wall according to the present embodiment constitutes the diaphragm wall 1 in the diaphragm wall 1 constructed on the ground G as an earth retaining structure or a foundation structure for buildings such as buildings. It is arranged to join adjacent elements 1A and 1B in a state in which vertical shear force is transmitted. The elements 1A and 1B are block-shaped wall bodies constructed by construction units per construction. As shown in FIG. 1, only two elements 1A and 1B are shown as the diaphragm wall 1 in this embodiment, but the diaphragm wall 1 has a large number of elements in one direction (a length described later). It can be constructed integrally and continuously in the direction X 1 ).

Here, the direction in which the elements 1A and 1B are joined and the direction in which the diaphragm wall 1 extends laterally is referred to as the length direction X1, and the thickness direction of the elements 1A and 1B is referred to as the wall thickness direction X2. , and the vertical direction is referred to as an up-down direction X3.

A diaphragm wall 1, like a conventional diaphragm wall, has a plurality of wall-like elements 1A and 1B which are provided in the ground with a predetermined width and are continuously and integrally joined along one direction. Thus, a wall body extending in the length direction X1 is constructed. The elements 1A and 1B are joined together via a joining plate joint 10. As shown in FIG. Here, the element with reference numeral 1A indicates a preceding element that is constructed earlier during construction, and the reference numeral 1B indicates a succeeding element that is joined to the side end portion of the preceding element 1A in the length direction X1.

The elements 1A and 1B are made of concrete 23 in which vertical reinforcing bars 21 and horizontal reinforcing bars 22 (see FIG. 6(a)) are embedded. Here, the spaces excavated when constructing the preceding element 1A and the succeeding element 1B are referred to as a preceding excavating portion 3A and a succeeding excavating portion 3B, respectively. The vertical reinforcing bars 21 and the horizontal reinforcing bars 22 can be integrated as a reinforcing bar cage.

As shown in FIGS. 2 and 3, the joining plate joint 10 includes a fixed partition plate 11 and a connecting plate 12 extending from both ends 11a of the fixed partition plate 11 toward the other element 1B (see FIG. 1) in the length direction X1. , 12, and a movable partition plate 13 which is separated from the fixed partition plate 11 in the length direction X1 and which is detachably provided between projecting end portions 12a of the pair of connection plates 12, 12. As shown in FIG. The height dimension of the joint plate joint 10 is set substantially equal to the depth dimension in the vertical direction X3 of the diaphragm wall 1 (elements 1A and 1B) to be constructed.

The fixed partition plate 11 has a width dimension smaller than the wall width of the elements 1A and 1B, and is separated from the joining surface of the succeeding element 1B (the other element) adjacent to the preceding element 1A (one element) in the length direction X1. Let it be arranged. That is, the fixed partition plate 11 is set smaller in width than the movable partition plate 13 .
Here, in the fixed partition plate 11, the surface where the fixed partition plates 11, 11 of the adjacent joint plate joints 10, 10 face each other is called the front surface 11b, and the opposite surface is called the back surface 11c.

As shown in FIGS. 2 to 4, a plurality of horizontally extending ridges 16 (16A, 16B) are provided on the front surface 11b and the back surface 11c of the fixed partition plate 11 at intervals in the vertical direction. ing. The protruding strips 16A and 16B are arranged with the tops of steel materials made of angle steel facing the outside of the fixed partition plate 11 and extend in the width direction of the fixed partition plate 11 . In this embodiment, they are positioned on both the left and right sides with reinforcing ribs 17 to be described later interposed therebetween. The first ridges 16A on the front surface 11b side and the second ridges 16B on the back surface 11c side are alternately displaced along the vertical direction when viewed from the side.

As shown in FIGS. 2 and 3, at the center of the fixed partition plate 11 in the wall thickness direction X2, there is a reinforcing rib 17 that protrudes in a direction orthogonal to the surface direction of the fixed partition plate 11 and extends in the vertical direction X3. is provided. Flanges 17 a arranged parallel to the surface direction of the fixed partition plate 11 are provided at both ends of the reinforcement rib 17 in the short side direction.

The pair of connecting plates 12, 12 gradually extend outward in the wall thickness direction X2 from both ends 11a, 11a of the fixed partition plate 11 toward the projecting end portion 12a. The projecting ends 12a of the pair of connecting plates 12, 12 are in contact with the excavated side surface 3b of the leading element 1A facing in the wall thickness direction X2.

The projecting end portion 12a of each connecting plate 12 is formed with a guide groove 18 extending over the connecting plate 12 in the vertical direction X3. The guide groove 18 extends in the vertical direction X3 and is formed by a pair of strip-shaped guide plates 181 and 182 that are arranged facing each other with a predetermined gap therebetween. The guide plates 181 and 182 are arranged with the plate surface direction parallel to the surface direction of the fixed partition plate 11 , and open on the side facing the other guide groove 18 . The pair of guide grooves 18, 18 are provided so as to guide the side edge 13a of the movable partition plate 13 so as to be slidable in the vertical direction X3 and to be detachable.

The movable partition plate 13 is provided so as to be movable in the vertical direction X<b>3 along the pair of guide grooves 18 , 18 and detachable from the guide grooves 18 , 18 . A space R is formed between the movable partition plate 13 and the fixed partition plate 11 when the movable partition plate 13 is mounted in the guide groove 18 .

The movable partition plate 13 is provided only when the diaphragm wall 1 is constructed. That is, the movable partition plate 13 of the joint plate joint 10 provided in the preceding excavated portion 3A during the concrete placement of the preceding element 1A moves along the guide groove 18 at the timing of excavating the succeeding excavated portion 3B of the succeeding element 1B. It is lifted upward and separated from the pair of connecting plates 12 , 12 . In other words, as shown in FIG. 1, the movable partition plate 13 does not remain in the concrete 23 of the constructed diaphragm wall 1 and form a part of the structure (see FIG. 6(c)).

The construction procedure of the diaphragm wall constructed in this manner will be described with reference to the drawings.
First, as shown in FIG. 5(a), among the adjacent elements 1A and 1B joined to a predetermined location where the diaphragm wall 1 is to be constructed, the ground G for constructing the preceding element 1A is excavated to form the preceding excavation portion 3A. Form.

After that, as shown in FIG. 5B, a fixed partition plate 11, a connecting plate 12, and a movable partition plate 13 are provided at the end (joint excavation surface 3a) on the joint side in the length direction X1 of the preceding excavation portion 3A. The joint plate joint 10 is installed. At this time, the joint plate joint 10 is arranged such that the fixed partition plate 11 faces the center of the longitudinal direction X1 of the preceding excavation portion 3A, and the movable partition plate 13 faces the joint excavation surface 3a.

Next, as shown in FIG. 5(c), the ground G on which the trailing element 1B adjacent to the leading element 1A will be constructed is excavated to form the trailing excavated portion 3B. When excavating the trailing excavating section 3B, since the movable partition plate 13 is attached, excavated soil does not enter the space R between the fixed partition plate 11 and the movable partition plate 13, and the fixed partition plate 11 and the movable partition plate 13 are fixed. It is possible to prevent excavated soil from adhering to the trailing excavated portion 3B side of the partition plate 11 .

Next, as shown in FIG. 6(a), reinforcing bars (vertical reinforcing bars 21 and horizontal reinforcing bars 22) are incorporated into the preceding excavation section 3A, and concrete 23 is poured. At this time, as shown in FIG. 1, the protruding end portions 12a of the pair of connecting plates 12, 12 are in contact with the excavation side surfaces 3b, 3b facing in the wall thickness direction X2 of the preceding excavation portion 3A. Concrete 23 can be placed without leaking to the trailing excavation section 3B side.

After that, as shown in FIG. 6(b), the end portion of the joining side in the length direction X1 of the trailing excavation portion 3B (the side of the element 1C joined to the trailing element 1B shown in FIG. 6(c)). , the joint plate joint 10 is installed. Then, as shown in FIG. 6B , the trailing excavation section 3B incorporates reinforcing bars (vertical reinforcing bars 21 and horizontal reinforcing bars 22) in the same manner as the preceding excavating section 3A.
As shown in FIG. 6(c), after the trailing excavation section 3C is excavated, the movable partition plate 13 is pulled up and moved upward along the guide groove 18 to be removed as shown in FIG.

After that, concrete 23 is placed. At this time, as shown in FIG. 1, the protruding end portions 12a of the pair of connecting plates 12, 12 are in contact with the excavation side surfaces 3b, 3b facing in the wall thickness direction X2 of the preceding excavation portion 3A. Concrete 23 can be placed without leaking to the trailing excavation portion 3C side.

Next, the operation of the above-described diaphragm wall joint structure and the diaphragm wall construction method will be described in detail with reference to the drawings.
In this embodiment, as shown in FIGS. 1, 5(a) to (c), and 6(a) to (c), the preceding excavation portion 3A of one preceding element 1A is excavated, and the preceding excavation A joint structure (joint plate joint 10) provided with a fixed partition plate 11, a pair of connecting plates 12, 12, and a movable partition plate 13 at the end of the portion 3A on the side of the trailing element 1A, which is the joint side, The movable partition plate 13 is arranged on the trailing element 1A side. Next, after excavating the trailing excavated portion 3B of the other trailing element 1B, concrete 23 is placed in the preceding excavated portion 3A. At this time, since the protruding ends 12a of the pair of connecting plates 12, 12 are in contact with the excavation side surfaces 3b, 3b facing in the wall thickness direction X2 of the preceding excavation portion 3A, the placed concrete 23 does not reach the succeeding excavation portion. It can be cast without leaking to the 3B side.

Further, when excavating the trailing excavating section 3B, since the movable partition plate 13 is mounted, excavated soil does not enter the space R between the fixed partition plate 11 and the movable partition plate 13. , the attachment of excavated soil to the trailing excavated portion 3B side of the fixed partition plate 11 can be prevented. Therefore, by removing the movable partition plate 13 after excavation of the trailing excavation portion 3B and pouring concrete 23 into the trailing excavation portion 3B, the concrete 23 can be brought into close contact with the fixed partition plate 11 to achieve integration. . As a result, the adjacent elements 1A and 1B can be joined while transmitting a shearing force in the vertical direction (vertical direction X3).

As described above, in the present embodiment, it is possible to eliminate the need for an uncut portion and to carry out stable construction work by installing the joint plate joint 10 having a simple structure in the preceding excavation portion 3A. . Therefore, construction efficiency can be improved, and construction costs can be reduced.

In addition, in this embodiment, the vertical shear force between the concrete placed in the elements 1A and 1B and the fixed partition plate 11 is supported by the bearing stress of the ridges 16 provided on the fixed partition plate 11. , its vertical load can be transmitted to the fixed partition plate 11 . Therefore, the adjacent elements 1A and 1B can be more reliably joined while transmitting shear force in the vertical direction.

Further, in this embodiment, the pair of connecting plates 12, 12 gradually extend outward in the wall thickness direction X2 from both ends 11a, 11a of the fixed partition plate 11 toward the projecting ends 12a, 12a. , the load of the concrete 23 placed in the excavated portions 3A, 3B of the elements 1A, 1B is directed outward in the wall thickness direction X2 along the inclined connecting plate 12, and the excavated side surfaces 3b of the excavated portions 3A, 3B can escape to Therefore, the load applied to the fixed partition plate 11 can be kept small, the position and posture of the fixed partition plate 11 can be prevented from shifting, and stable construction can be performed.

Further, in this embodiment, the movable partition plate 13 can be moved upward along the guide groove 18 by grasping the upper portion of the movable partition plate 13 and pulling it up. In this case, even if the earth and sand adhere to the movable partition plate 13, it can be easily pulled up, and it can be easily removed from the connecting plate 12 without requiring time-consuming detachment work such as bolt fastening.

In this embodiment, since the fixed partition plate 11 is reinforced by the reinforcing ribs 17, the structure can withstand the load of the concrete 23 placed in the excavated portions 3A and 3B of the elements 1A and 1B, and stable construction can be achieved. It can be carried out.
Moreover, since the reinforcing ribs 17 protrude from the fixed partition plate 11 toward the excavated portions 3A and 3B, it is possible to improve the adhesion with the concrete 23 placed in the excavated portions 3A and 3B and achieve more reliable integration. can be done.

As described above, in the diaphragm wall joint structure and the diaphragm wall construction method according to the present embodiment, a simple structure can eliminate the need for an uncut portion, and stable construction can be performed. Construction efficiency can be improved, and construction costs can be reduced.

Although embodiments of the diaphragm wall joint structure and the diaphragm wall construction method according to the present invention have been described above, the present invention is not limited to the above-described embodiments and is within the scope of the invention. can be changed as appropriate.

For example, the configuration of the joint plate joint 10 in this embodiment can be changed as appropriate.
As an example, in this embodiment, the protrusions 16 (16A, 16B) extending in the horizontal direction are provided on the front surface 11b and the back surface 11c of the fixed partition plate 11. , the installation position, etc. can be changed as appropriate, and the ridge 16 can be omitted. For example, the ridges 16 may be provided only on the surface 11 b of the fixed partition plate 11 .

In addition, the pair of connecting plates 12 of the joint plate joint 10 of the present embodiment extend so as to gradually incline outward in the wall thickness direction X2 from both ends 11a of the fixed partition plate 11 toward the projecting end portion 12a. Although it is provided, it is not limited to this. For example, the fixed partition plate 11 may have substantially the same width as the element, and the connection plate 12 may be arranged parallel to the excavation side surface 3b of the excavation section.

Further, in this embodiment, as a structure for attaching and detaching the movable partition plate 13 to and from the connecting plate 12, the movable partition plate 13 is moved vertically along the guide groove 18 formed in the projecting end portion 12a of the connecting plate 12 and extending in the vertical direction. Although it is possible, it is not limited to this, and it is also possible to employ other attachment/detachment methods.

Furthermore, the fixed partition plate 11 is provided with reinforcing ribs 17 projecting in a direction intersecting the surface direction and extending in the vertical direction, but the shape and position of the reinforcing ribs 17 are limited to those of this embodiment. It is also possible to omit the reinforcing ribs 17 .

In addition, it is possible to appropriately replace the components in the above-described embodiments with well-known components without departing from the scope of the present invention.

Reference Signs List 1 diaphragm wall 1A leading element 1B trailing element 3A leading excavation section 3B trailing excavation section 10 joining plate joint 11 fixed partition plate 11b front surface 11c back surface 12 connecting plate 12a projecting end 13 movable partition plate 16, 16A, 16B convex Row 17 Reinforcement rib 18 Guide groove R Space X1 Length direction X2 Wall thickness direction X3 Vertical direction

Claims (6)

A diaphragm wall joint structure arranged to join adjacent elements while transmitting a vertical shear force,
a fixed partition plate spaced apart from the joint surface of the other adjacent element in one of the elements;
a connecting plate extending from both ends of the fixed partition plate toward the joint surface side of the other element;
a movable partition plate that is separated from the fixed partition plate in the longitudinal direction, which is the direction in which the diaphragm wall extends in the horizontal direction, and that is detachably provided between projecting ends of the pair of connecting plates; with
The protruding end portions of the pair of connecting plates are in contact with the excavated side surfaces facing each other in the wall thickness direction of the one element,
The fixed partition plate and the reinforcing bars embedded in the elements are not connected,
A joint structure for a diaphragm wall , wherein at least one of the front and back surfaces of the fixed partition plate is provided with a ridge extending in a horizontal direction . 2. The diaphragm wall according to claim 1 , wherein the connecting plate gradually extends outward in the wall thickness direction from both ends of the fixed partition plate toward the projecting end. joint structure. A guide groove extending in the vertical direction is formed in the projecting end of the connecting plate,
3. The diaphragm wall joint structure according to claim 1 , wherein the movable partition plate is provided so as to be vertically movable along the guide groove and detachable from the guide groove. . 4. The fixed partition plate according to any one of claims 1 to 3 , wherein the fixed partition plate is provided with reinforcing ribs projecting in a direction intersecting the surface direction of the fixed partition plate and extending in the vertical direction. Joint construction of the described diaphragm wall. The joint structure for a diaphragm wall according to any one of claims 1 to 4 , wherein the movable partition plate is a flat plate. A diaphragm wall construction method for constructing a diaphragm wall using the joint structure according to any one of claims 1 to 5 ,
excavating a portion of adjacent elements to be joined to form a preceding element to form a preceding excavation;
a step of installing a joint plate joint including the fixed partition plate provided with the ridge, the connecting plate, and the movable partition plate at the joint side end portion in the longitudinal direction of the preceding excavation portion;
a step of incorporating a reinforcing bar into the preceding excavation;
placing concrete in the preceding excavation;
excavating a portion for constructing a succeeding element that joins the preceding element to form a succeeding excavation;
a step of removing the movable partition plate after excavation of the trailing excavation section;
placing concrete in the trailing excavation section from which the movable partition plate has been removed;
A method for constructing a diaphragm wall, comprising:

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