JP2020125661A - Joint structure of underground continuous wall, and construction method of underground continuous wall - Google Patents

Abstract

To make an unexcavated portion unnecessary with a simple structure, to perform a stable construction, to improve construction efficiency, and to decrease construction cost.SOLUTION: A joint structure of an underground continuous wall comprises: a fixed partition plate 11 disposed apart from a joint surface 3a included in a precedent element 1A and adjacent to a following element 1B; a pair of connection plates 12 extending from both ends 11a,11a of the fixed partition plate 11 toward the joint surface 3a side adjacent to the following element 1B; and a movable partition plate 13 separated from the fixed partition plate 11 in a longer direction X1 and provided detachably to each of protruding end portions 12a,12a of the pair of connection plates 12,12; in which the protruding end portions 12a of the pair of connection plates 12,12 are in contact with an excavation side faces 3b facing each other in a wall thickness direction X2 of the precedent element 1A.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a joint structure for an underground continuous wall and a method for constructing an underground continuous wall.

BACKGROUND ART Conventionally, as an underground continuous wall such as a mountain retaining wall, there has been known one that employs a rigid joint which is a rigid joint of horizontal reinforcing bars connected to a joined steel plate as shown in Patent Document 1, for example.
In recent years, there has been a demand for a transmission mechanism capable of transmitting a shear force in the vertical direction on the underground continuous wall. As a joint method for transmitting the vertical shearing force, a method using a jointed steel plate joint in which a convex angle member (projection member) is installed on a partition steel plate is known. Specifically, the vertical shearing force of the general portion is supported as a vertical load by the bearing stress of the ridge member, and the load is transmitted to the partition plate via the welded portion with the partition plate. Further, there is also one in which an inter-wall joint portion is provided which transmits the load from the welded portion of the partition plate to the ridge member and transmits it as a vertical load to the general portion via the bearing force of concrete.

As a joint method between elements in such an underground continuous wall, first, the preceding excavation portion for constructing the preceding element is excavated every other section. Specifically, the jointed steel plate joints are installed inside the adjacent preceding excavation parts that have been excavated by skipping one section, and a rebar cage is built and concrete is placed to construct the preceding and succeeding elements (preceding continuous walls). .. At this time, the joints of the steel plate joints are arranged at positions separated from the left and right end surfaces of the preceding excavation portion by a predetermined distance. That is, it is in a state in which the casting remaining portions are formed on both sides of the preceding element.
Then, a trailing element is installed between the leading elements. Specifically, the trailing excavation portion is formed by excavating the remaining portion between the preceding excavation portions. As a result, the remaining casting section is connected to the trailing excavation section to form an excavation space between the preceding elements. Then, a rebar cage is built in this excavation space and concrete is placed to construct a trailing element (trailing continuous wall).

JP, 11-269870, A

However, the conventional method of joining elements between underground walls has the following problems.
That is, in the conventional case, since the unexcavated portion is excavated twice during the excavation of the leading excavation portion and during the excavation of the trailing excavation portion, the amount of stabilizing liquid required for excavation increases. There are problems and construction efficiency is also inefficient.

Further, since the uncut portion is left in a bare state for a long time, the groove wall may be collapsed.
Further, since there is an uncut portion, it is necessary to prevent the concrete from leaking to the trailing excavated portion of the adjoining trailing element by arranging, for example, a partition steel plate over the entire circumference. 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 that respect.

The present invention has been made in view of the above-mentioned problems, can eliminate the need for a moat-remaining portion with a simple structure, can perform stable construction, and can improve construction efficiency, An object of the present invention is to provide a joint structure for a continuous underground wall and a method for constructing a continuous underground wall that can reduce the construction cost.

In order to achieve the above-mentioned object, the joint structure of an underground continuous wall according to the present invention is a joint structure of an underground continuous wall arranged for joining adjacent elements in a state in which a vertical shearing force is transmitted. And a fixed partition plate disposed apart from the joint surface of the other adjacent element in one of the elements, and extending from both ends of the fixed partition plate toward the joint surface side of the other element. A pair of connecting plates and a movable partition plate that is separated from the fixed partition plate in the length direction and is detachably provided at the projecting end portions of the pair of connecting plates. The end portion is in contact with the excavation side surface facing the wall thickness direction of the one element.

Further, the construction method of the underground continuous wall according to the present invention is a construction method of the underground continuous wall for constructing the underground continuous wall by using the joint structure described above, and one of the adjacent elements to be joined is preceded. A step of excavating a portion for constructing an element to form a preceding excavation portion, and a fixed partition plate, the connecting plate, and the movable partition plate at the end of the preceding excavation portion on the joining side in the longitudinal direction. A step of installing a joining plate joint, a step of placing concrete in the preceding excavation portion, a step of excavating a portion that constructs a posterior element that is joined to the preceding element to form a posterior excavating portion, and The method is characterized by including a step of removing the movable partition plate after excavating the trailing excavation portion, and a step of placing concrete in the trailing excavation portion from which the movable partition plate has been removed.

According to the present invention, the preceding excavation portion of one preceding element is excavated, and the joint structure including the fixed partition plate, the connecting plate, and the movable partition plate at the end on the trailing element side which is the joining side of the preceding excavation portion Plate joint) 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 projecting ends of the pair of connecting plates are in contact with the excavation side surfaces of the preceding excavation portion that face each other in the wall thickness direction, the concrete that is placed must be placed without leaking to the trailing excavation portion side. You can

Also, when excavating the trailing excavation part, 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, and the fixed partition plate It is possible to prevent excavated soil from adhering to the trailing excavation part side. Therefore, by removing the movable partition plate after the excavation of the trailing excavation unit and placing concrete in the trailing excavation unit, it is possible to bring the concrete into close contact with the fixed partition plate for integration. As a result, the adjacent elements can be joined together while the vertical shearing force is being transmitted.

As described above, according to the present invention, by the labor-free work of installing the joining plate joint having a simple structure in the preceding excavation portion, the uncut portion can be eliminated, and stable construction can be performed. Therefore, the construction efficiency can be improved and the construction cost can be reduced.

Further, in the joint structure of the underground continuous wall according to the present invention, it is preferable that a ridge extending in the horizontal direction is provided on at least one of the front and back surfaces of the fixed partition plate.

In this case, the vertical shearing force between the concrete cast 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 fixed. Can be transmitted to. Therefore, it is possible to more reliably join the adjacent elements to each other in a state where the shearing force in the vertical direction is transmitted.

Further, in the joint structure of the underground continuous wall according to the present invention, the connecting plate gradually extends toward the outer side in the wall thickness direction from both ends of the fixed partition plate toward the protruding end. Is preferred.

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

Further, in the joint structure of the underground continuous wall according to the present invention, a guide groove extending in the vertical direction is formed at the projecting end of the connecting plate, and the movable partition plate extends in the vertical direction along the guide groove. It may be 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 gripping and lifting the upper portion of the movable partition plate. In this case, even if earth and sand adhere to the movable partition plate, the movable partition plate can be easily pulled up, and laborious work such as bolt fastening is not required, and the movable partition plate can be easily removed.

Further, in the underground continuous wall joint structure according to the present invention, the fixed partition plate is provided with a reinforcing rib protruding in a direction intersecting the surface direction of the fixed partition plate and extending in the vertical direction. May be a feature.

In this case, the fixed partition plate is reinforced by the reinforcing ribs, so that the structure can withstand the load of concrete cast in the excavated portion of the element, and stable construction can be performed.
Moreover, since the reinforcing ribs project from the fixed partition plate toward the excavated portion, it is possible to improve the adhesiveness with the concrete placed in the excavated portion and achieve more reliable integration.

According to the joint structure of the underground continuous wall of the present invention, and the method for constructing the underground continuous wall, it is possible to eliminate the moat remaining portion with a simple structure, and it is possible to perform stable construction, and to improve the construction efficiency. It is possible to improve, and it is possible to reduce the construction cost.

It is a partially broken perspective view which shows the construction state of the underground continuous wall by embodiment of this invention. It is a perspective view which shows the upper part of a joining plate joint. It is the top view which looked at the joining board joint from the upper part. It is the sectional view on the AA line shown in FIG. 3, and is a longitudinal cross-sectional view of the upper part of a joining plate joint. (A)-(c) is a figure which shows the construction procedure of an underground continuous wall. (A)-(c) is a figure which shows the construction procedure of an underground continuous wall following FIG.5(c).

Hereinafter, a joint structure for an underground continuous wall and a method for constructing an underground continuous wall 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 underground continuous wall according to the present embodiment constitutes the underground continuous wall 1 in the underground continuous wall 1 constructed in the ground G as a retaining structure of a building such as a building or as a basic structure. The elements 1A and 1B adjacent to each other are arranged to join each other while transmitting the shearing force in the vertical direction. Each of the elements 1A and 1B is a block-shaped wall body configured by a construction unit per construction. Note that, as shown in FIG. 1, in the present embodiment, only two elements 1A and 1B are shown as the underground continuous wall 1, but the underground continuous wall 1 has a large number of elements in one direction (length described later). It can be constructed integrally and continuously in the direction X2).

Here, the direction in which the elements 1A and 1B are joined and the direction in which the underground continuous wall 1 extends in the lateral direction is called the length direction X1, and the thickness direction of the elements 1A and 1B is the wall thickness direction X2. The vertical direction is called the vertical direction X3.

Like the conventional underground continuous wall, the underground continuous wall 1 continuously and integrally joins a plurality of wall-shaped elements 1A and 1B provided in the ground with a predetermined width in one direction. Then, a wall body extending in the length direction X1 is configured. The elements 1A and 1B are joined to each other via a joint plate joint 10. Here, the element indicated by reference numeral 1A indicates a preceding element that is constructed in advance during construction, and the reference numeral 1B indicates a succeeding element joined to a 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. 6A) are embedded. Here, the spaces excavated when constructing the leading element 1A and the trailing element 1B are referred to as a leading drilling portion 3A and a trailing drilling portion 3B, respectively. The vertical reinforcing bar 21 and the horizontal reinforcing bar 22 may be integrated as a reinforcing bar cage.

As shown in FIGS. 2 and 3, the joint 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 in the length direction X1 toward the other element 1B (see FIG. 1). , 12 and a movable partition plate 13 that is separated from the fixed partition plate 11 in the length direction X1 and is detachably provided between the protruding end portions 12a of the pair of connecting plates 12 and 12. The height dimension of the joining plate joint 10 is set to be substantially equal to the depth dimension in the vertical direction X3 of the underground continuous wall 1 (element 1A, 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 length direction X1 in the preceding element 1A (one element). It is arranged. That is, the width of the fixed partition plate 11 is set smaller than that of 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 referred to as a front surface 11b, and the opposite surface is referred to as a back surface 11c.

As shown in FIGS. 2 to 4, on the front surface 11b and the back surface 11b of the fixed partition plate 11, a plurality of ridges 16 (16A, 16B) extending in the horizontal direction are provided at intervals in the vertical direction. There is. The ridges 16</b>A and 16</b>B are arranged with the top of the steel material made of chevron steel facing the outside of the fixed partition plate 11 and extend in the width direction of the fixed partition plate 11. In the present embodiment, they are located on both the left and right sides with a reinforcing rib 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 arranged in a state of being alternately displaced along the vertical direction when viewed from the side.

As shown in FIGS. 2 and 3, a reinforcing rib 17 protruding in a direction orthogonal to the surface direction of the fixed partition plate 11 and extending in the up-down direction X3 is provided at the center portion of the fixed partition plate 11 in the wall thickness direction X2. It is provided. At both ends of the reinforcing rib 17 in the short side direction, flanges 17a arranged parallel to the surface direction of the fixed partition plate 11 are provided.

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 12a. The projecting end portions 12a of the pair of connecting plates 12, 12 are in contact with the excavation side surface 1b of the preceding element 1A that faces the wall thickness direction X2.

A guide groove 18 is formed on the protruding end 12a of each connecting plate 12 and extends over the entire connecting plate 12 in the up-down direction X3. The guide groove 18 extends in the up-down direction X3 and is formed by a pair of strip-shaped guide plates 181 and 182 that are arranged to face each other with a predetermined gap. The guide plates 181 and 182 are arranged such that the plate surface direction is parallel to the surface direction of the fixed partition plate 11, and are open to 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 to be slidable in the vertical direction X3 and detachable.

The movable partition plate 13 is provided so as to be movable in the up-down direction X3 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 underground continuous wall 1 is constructed. That is, the movable partition plate 13 of the joint plate joint 10 provided in the preceding excavation portion 3A when the preceding element 1A is poured into concrete is guided along the guide groove 18 at the timing when the following excavation portion 3B of the following element 1B is excavated. It is pulled up and separated from the pair of connecting plates 12, 12. That is, as shown in FIG. 1, the movable partition plate 13 does not remain in the concrete 23 of the constructed underground continuous wall 1 to form a structure (see FIG. 6C).

A construction procedure of the underground continuous wall configured in this way will be described based on the drawings.
First, as shown in FIG. 5(a), of the adjacent elements 1A and 1B that are joined to a predetermined location where the underground continuous wall 1 is to be constructed, the ground G that constructs 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) of the preceding excavation portion 3A on the joint side in the length direction X1. 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 preceding excavation portion 3A in the length direction X1 and the movable partition plate 13 faces the joint excavation surface 3a.

Next, as shown in FIG. 5C, the ground G that constructs the trailing element 1B adjacent to the leading element 1A is excavated to form the trailing excavating portion 3B. When excavating the trailing excavation section 3B, the movable partition plate 13 is attached, so that the 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 13 is fixed. It is possible to prevent the excavated soil from adhering to the trailing excavation portion 3B side of the partition plate 11.

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

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

Then, concrete 23 is poured. At this time, as shown in FIG. 1, since the projecting end portions 12a of the pair of connecting plates 12 and 12 are in contact with the excavation side surfaces 3b and 3b facing the wall thickness direction X2 of the preceding excavation portion 3A, they are placed. The concrete 23 can be placed without leaking to the trailing excavation portion 3B side.

Next, the operation of the joint structure for the underground continuous wall and the method for constructing the underground continuous wall described above will be described in detail with reference to the drawings.
In the present embodiment, as shown in FIGS. 1, 5A to 5C, and 6A to 6C, the preceding excavation portion 3A of one preceding element 1A is excavated and the preceding excavation is performed. A joint structure (joint plate joint 10) including a fixed partition plate 11, a pair of connecting plates 12 and 12, and a movable partition plate 13 at an end portion on the trailing element 1A side that is the joint side in the portion 3A, The movable partition plate 13 is arranged so as to be on the trailing element 1A side. Next, after excavating the trailing excavation portion 3B of the other trailing element 1B, concrete is placed in the leading excavation portion 3A. At this time, the projecting end portions 12a of the pair of connecting plates 12, 12 are in contact with the excavation side surfaces 3b, 3b of the preceding excavation portion 3A facing in the wall thickness direction X2. It can be placed without leaking to the side.

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

As described above, in the present embodiment, due to the effortless work of installing the joint plate joint 10 having a simple structure in the preceding excavation portion 3A, the uncut portion can be eliminated, and stable construction can be performed. it can. Therefore, the construction efficiency can be improved and the construction cost can be reduced.

Further, in the present embodiment, the vertical shearing force between the concrete cast in the elements 1A and 1B and the fixed partition plate 11 is supported by the bearing stress of the ridge 16 provided on the fixed partition plate 11. The vertical load can be transmitted to the fixed partition plate 11. Therefore, the adjacent elements 1A and 1B can be more reliably joined to each other while the shearing force in the vertical direction is transmitted.

In addition, in the present embodiment, the pair of connecting plates 12, 12 gradually extends 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 excavation side face 3b of the excavation parts 3A, 3B while directing the load due to the load of the concrete 23 cast on the excavation parts 3A, 3B of the elements 1A, 1B toward the outside in the wall thickness direction X2 along the inclined connecting plate 12. Can be escaped to. Therefore, the load applied to the fixed partition plate 11 can be suppressed to be small, the position and the posture of the fixed partition plate 11 can be prevented from shifting, and stable construction can be performed.

In the present embodiment, the movable partition plate 13 can be moved upward along the guide groove 18 by gripping and lifting the upper portion of the movable partition plate 13. In this case, even if the movable partition plate 13 is covered with earth and sand, it can be easily pulled up, and a troublesome work such as bolt fastening is not required, and the movable partition plate 13 can be easily removed from the connecting plate 12.

In addition, in the present embodiment, since the fixed partition plate 11 is reinforced by the reinforcing ribs 17, a structure that can withstand the load of the concrete 23 cast in the excavated portions 3A and 3B of the elements 1A and 1B is provided, and stable construction can be performed. It can be carried out.
Moreover, since the reinforcing ribs 17 project from the fixed partition plate 11 toward the excavation portions 3A, 3B, it is possible to improve the adhesion with the concrete 23 cast in the excavation portions 3A, 3B to achieve more reliable integration. You can

As described above, in the joint structure of the underground continuous wall according to the present embodiment, and the method of constructing the underground continuous wall, it is possible to eliminate the uncut portion with a simple structure, and perform stable construction, The construction efficiency can be improved and the construction cost can be reduced.

Although the embodiment of the joint structure of the underground continuous wall and the method of constructing the underground continuous wall according to the present invention has been described above, the present invention is not limited to the above-described embodiment, and does not deviate from the spirit thereof. Can be changed appropriately.

For example, the configuration of the joint plate joint 10 in the present embodiment can be appropriately changed.
As an example, in the present embodiment, the ridges 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, but the number of the ridges 16 and the arrangement interval in the vertical direction are provided. The configuration such as the installation position can be changed as appropriate, and the ridge 16 can be omitted. For example, the ridges 16 may be provided only on the surface 11b of the fixed partition plate 11.

In addition, the pair of connecting plates 12 of the joint plate joint 10 of the present embodiment gradually extend toward the outer side in the wall thickness direction X2 from the both ends 11a of the fixed partition plate 11 toward the protruding end 12a. It is provided, but is not limited to this. For example, the width of the fixed partition plate 11 may be substantially the same as that of the element, and the connecting plate 12 may be arranged parallel to the excavation side surface 3b of the excavation portion.

Further, in the present 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 in the vertical direction along a vertically extending guide groove 18 formed in the projecting end 12a of the connecting plate 12. Although possible, the present invention is not limited to this, and other attachment/detachment methods can be adopted.

Furthermore, the fixed partition plate 11 is provided with a reinforcing rib 17 which projects in a direction intersecting the plane direction and extends in the vertical direction, but the shape and position of the reinforcing rib 17 are not limited to this embodiment. Alternatively, the reinforcing rib 17 can be omitted.

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

DESCRIPTION OF SYMBOLS 1 Underground continuous wall 1A Leading element 1B Trailing element 3A Leading excavation portion 3B Trailing drilling portion 10 Joining plate joint 11 Fixed partition plate 11b Surface 11c Back surface 12 Connecting plate 12a Projected end 13 Movable partition plate 16, 16A, 16B Convex Article 17 Reinforcing rib 18 Guide groove R Space X1 Length direction X2 Wall thickness direction X3 Vertical direction

Claims (6)

A joint structure for a continuous underground wall arranged to join adjacent elements in a state where a vertical shearing force is transmitted,
A fixed partition plate arranged apart from the joining 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,
While being separated from the fixed partition plate in the length direction, a movable partition plate detachably provided on the protruding end portions of the pair of connecting plates,
The joint structure of the underground continuous wall, wherein the projecting end portions of the pair of the connecting plates are in contact with the excavation side surfaces facing each other in the wall thickness direction of the one element. The joint structure of the underground continuous wall according to claim 1, wherein at least one of the front and back surfaces of the fixed partition plate is provided with a ridge extending in the horizontal direction. The underground plate continuation according to claim 1 or 2, wherein the connecting plate gradually extends toward the outside in the wall thickness direction from both ends of the fixed partition plate toward the protruding end portion. Wall joint structure. A guide groove extending in the vertical direction is formed at the protruding end of the connecting plate,
4. The underground 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. Continuous wall joint structure. 5. The fixed partition plate is provided with a reinforcing rib that protrudes in a direction intersecting the surface direction of the fixed partition plate and extends in the up-and-down direction. Joint structure of continuous underground wall described. A method of constructing an underground continuous wall using the joint structure according to claim 1, wherein the underground continuous wall is constructed by:
A step of forming a preceding excavation portion by excavating a part that constructs one preceding element of adjacent elements to be joined,
A step of installing a joint plate joint including the fixed partition plate, the connection plate, and the movable partition plate at the end portion on the joint side in the length direction of the preceding excavation portion,
A step of placing concrete in the preceding excavation section,
Forming a trailing excavation portion by excavating a portion that constructs a trailing element that is joined to the leading element,
After excavating the trailing excavation unit, a step of removing the movable partition plate,
A step of placing concrete in the trailing excavation part from which the movable partition plate has been removed;
A method for constructing an underground continuous wall, which comprises:

Images