Tool for removing deposits from the core material of a continuous underground wall.

Abstract

To provide an accretion removal tool of a core material of a continuous wall which removes an accretion attached to a male joint, prevents a foreign matter from entering into a female joint, facilitates construction, and does not require a special device for construction.SOLUTION: An accretion removal tool 5 for removing an accretion attached to a core material 2 of an underground continuous wall used when it is build by connecting a female joint 30 of a core material 3 to a male joint 20 of a core material 2 of a built underground continuous wall, includes a body part 50 having an upper surface 50a in contact with a lower end opening 30a of an internal space part 301 of the male joint 30, a reinforcement material 7 embedded in the body part 50, and a notch 51 which surrounds an extension piece 200 and an anti-slip piece 201 of the male joint 20, and is engaged with the male joint 20 so as to be slidable in the longitudinal direction of the male joint 20, wherein the outer shape of the upper face 50a is larger than the inner shape of the lower end opening 30a other than the notch 51.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a sediment removal tool for removing sediment, particularly at the joint of the core material of a diaphragm wall.

Background Art

[0002] Some diaphragm walls use a core material mainly made of steel. The diaphragm wall using the core material is constructed by connecting H-shaped core materials with male joints or female joints at both ends of the flange at the joint part in the excavated part of the excavated ground, building them in multiple layers, and filling the surrounding with a filler.

[0003] Specific construction methods include a method of replacing the stabilizing fluid with concrete after building the core material in the excavated part of the ground filled with the stabilizing fluid, and a method of constructing soil mortar by in-situ soil mixing while excavating the excavated part and building the core material therein.

[0004] When building such a core material in the stabilizing fluid or soil mortar, especially when connecting a female joint to the male joint of the already built core material to build the core material, if sediment or the like adheres to the male joint, the adherent may enter the inside of the female joint of the core material to be built, hinder the progress of the core material, and make it difficult to build the core material.

[0005] When it becomes difficult to build the core material, the following problems occur. ・When rebuilding the core material, it takes time and effort to pull up the core material, and the productivity at the site is greatly reduced. ・If the core material that cannot be built is forcibly pulled out, the joints of the previously built core material may be deformed or damaged. ・If the core material cannot be built to the normal position, there will be adverse effects such as the inability to ensure the specified specifications of the diaphragm wall, or the need to reinstall the coupler for reinforcing bar connection during the construction of the structure, or the deterioration of the quality of the structure.

[0006] Furthermore, as described in Patent Document 1, a conventional method for constructing a ribbed wall has been proposed in which a male joint is inserted into a female joint to connect steel ribbed wall members in an excavated section of the ground, the area around them is filled with soil mortar, a guide hole is formed by drilling a hole in the soil mortar inside the female joint on the unexcavated side of the ground, the excavator is lowered while passing a guide material for the excavator through the guide hole to excavate the unexcavated section, steel ribbed wall members are connected and erected in this excavated section, and the area around them is filled with soil mortar.

[0007] This method of constructing interconnected walls makes it difficult for foreign objects to enter the joints when installing the interconnected wall members, and allows all interconnected wall members to be installed at a stable height. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2014-101712 [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] However, the method of constructing a continuous wall as described in Patent Document 1 above does not involve connecting female joints to already placed male joints and then erecting them. Instead, it requires tedious work such as scraping away the soil mortar that has penetrated the inside of the joints to form guide holes, which not only makes the construction time-consuming and laborious, but also requires a special excavator equipped with guide materials. The problem that this invention aims to solve is to provide a tool for removing deposits from the core material of a continuous underground wall that removes deposits attached to the male joint, prevents deposits such as soil attached to the male joint from entering the inside of the female joint, and is easy to install and does not require special construction equipment. [Means for solving the problem]

[0010] The invention according to claim 1 is a material removal tool for removing material adhering to a core material in a continuous underground wall that is constructed by connecting a female joint of another core material to a male joint of one core material that has already been erected, comprising: a main body made of mortar having a lower end opening contact portion that abuts against a lower end opening that forms an opening at the lower end of the internal part of the female joint; a reinforcing member embedded in the main body; and a notch formed in the main body that surrounds the portion of the male joint that is arranged in the internal part of the female joint and engages with the male joint so as to be slidable along the longitudinal direction of the male joint, wherein the outer shape of the lower end opening contact portion is larger than the inner shape of the lower end opening except for the notch. The invention according to claim 2 is a core material adhering removal tool according to claim 1, characterized in that the main body portion has a tapered side surface that narrows downwards, and the outer shape of the lower end opening contact portion is larger than the outer shape of the lower end opening, except for the notched portion. The invention according to claim 3 is a core material adhering removal tool according to claim 1 or 2, characterized in that the main body portion has tapered sides that narrow downwards and a flat bottom surface. The invention according to claim 4 is a core material adhering removal tool according to any one of claims 1 to 3, characterized in that the notch is formed to create a clearance between it and the male joint, and projections are formed on the surfaces of the notch that sandwich the plate-shaped portion of the male joint from both sides, and the projections are in contact with the plate-shaped portion. The invention according to claim 5 is a core material adhering removal tool according to any one of claims 1 to 4, characterized in that a mounting portion for attachment to the lower end opening is formed in the lower end opening contact portion. The invention according to claim 6 is a core material adhering removal tool according to claim 5, characterized in that the mounting portion comprises a protrusion that engages with the lower end opening. The invention according to claim 7 is a core material adhering removal tool according to any one of claims 1 to 6, characterized in that the main body is made of mortar. The invention according to claim 8 is a core material adhering removal tool according to any one of claims 1 to 7, characterized in that the reinforcing material is wire mesh. The invention according to claim 9 is a core material adhering removal tool according to any one of claims 1 to 8, wherein the main body portion has cylindrically formed sides. The following are also acceptable alternative inventions. Means 1 This is a material removal tool for removing material adhering to a core material in a continuous underground wall constructed by connecting a female joint of another core material to a male joint of a core material that has already been erected, and comprises a main body having a lower end opening contact portion that abuts against a lower end opening that forms an opening at the lower end of the internal part of the female joint, a reinforcing member embedded in the main body, and a notch formed in the main body that surrounds the portion of the male joint that is arranged in the internal part of the female joint and engages with the male joint so as to be slidable along the longitudinal direction of the male joint, wherein the outer shape of the lower end opening contact portion is larger than the inner shape of the lower end opening except for the notch.

[0011] Means 2 The main body portion is characterized by having tapered sides that narrow downwards, and the outer shape of the lower end opening contact portion is larger than the outer shape of the lower end opening, except for the notched portion. Means 1 This is a tool for removing deposits from the core material described above.

[0012] Means 3 The main body is characterized by having tapered sides that narrow downwards, and a flat bottom surface. Means 1 or Means 2 This is a tool for removing deposits from the core material described above.

[0013] Means 4 The notch is formed to create a clearance between it and the male joint, and the surfaces of the notch that sandwich the plate-shaped portion of the male joint from both sides have protrusions that contact the plate-shaped portion. Any of means 1 through 3 It is a tool for removing deposits on the core material described in

[0014] Means 5 is characterized in that a mounting portion for mounting to the lower end opening is formed at the lower end opening contact portion Any of means 1 through 4 It is a tool for removing deposits on the core material described in

[0015] Means 6 The mounting portion is characterized by including a convex portion that engages with the lower end opening Means 5 It is a tool for removing deposits on the core material described in

[0016] Means 7 The main body is characterized by being composed of mortar Any of means 1 through means 6 It is a tool for removing deposits on the core material described in

[0017] Means 8 The reinforcing material is characterized by being a wire mesh Any of means 1 through means 7 It is a tool for removing deposits on the core material described in

[0018] Means 9 The main body has a side surface formed in a cylindrical shape Any of means 1 through means 8 It is a tool for removing deposits on the core material described in

Advantages of the Invention

[0021] In addition, the main body has tapered sides that narrow downwards, and the bottom surface is flat, which reduces resistance during installation, improves the effectiveness of removing attached materials, and makes it less likely for the tip of the attached material removal tool to be damaged when installing the core material.

[0022] In addition, the notch is formed to create a clearance between it and the male joint, and the inner surface of the notch that sandwiches the plate-shaped part of the male joint from both sides has protrusions that contact the plate-shaped part. This allows for smooth sliding during installation, and the protrusions contact the plate-shaped part to restrict the deformation of the deposit removal tool toward the inside of the notch due to the pressure received on the sides, thereby preventing damage.

[0023] In addition, since a mounting portion is formed at the lower end opening contact portion for attachment to the lower end opening, the material removal tool does not shift away from the female joint when the core material is erected, and the material removal tool does not separate from the core material even with vibrations when the core material is erected or movement in the pulling direction when it is re-drilled, preventing the removed material from entering the interior of the female joint from the lower end opening.

[0024] In addition, since the main body is made of mortar, the strength of the adhering material removal tool can be increased.

[0025] In addition, the main body is reinforced with embedded reinforcing material, which prevents cracking of the adhering material removal tool.

[0026] In addition, since the reinforcing material is made of wire mesh, it can be manufactured inexpensively and easily.

[0027] In addition, because the main body has cylindrically shaped sides, the strength of the main body can be increased. [Brief explanation of the drawing]

[0028] [Figure 1] Plan view of a continuous underground wall. [Figure 2] An exploded perspective view of the main parts when the first embodiment of the present invention is used as a core material. [Figure 3] A perspective view of the main part when the first embodiment of the present invention is used as a core material. [Figure 4] A perspective view of the first embodiment of the present invention. [Figure 5] A plan view of the main part when the first embodiment of the present invention is used as a core material. [Figure 6] A plan view of a second embodiment of the present invention. [Figure 7] A longitudinal cross-sectional view of the main part of the second embodiment of the present invention and the female joint. [Figure 8] A perspective view of a third embodiment of the present invention. [Figure 9] An exploded perspective view showing an example of a mold for manufacturing a deposit removal tool according to a third embodiment of the present invention. [Figure 10A] A perspective view of the formwork for a third embodiment of the present invention, a tool for removing deposits. [Figure 10B] A plan view of the formwork for a deposit removal tool according to a third embodiment of the present invention. [Modes for carrying out the invention]

[0029] Embodiments of the present invention will be described below with reference to the drawings. It goes without saying that the present invention is not limited to these embodiments.

[0030] [First Embodiment] A first embodiment of the present invention will be described with reference to Figures 1 to 4. Figure 1 is a plan view of a continuous underground wall in which the first embodiment is used, and Figures 2, 3, and 4 are exploded perspective views, perspective views, and perspective views of the main components when the deposit removal tool of the first embodiment is used as a core material, respectively.

[0031] As shown in Figure 1, the underground continuous wall 1 is constructed by interlocking steel core members 2 having male joints 20 and core members 3 having female joints 30 in a trench (excavation section 10) formed by excavating the ground, and then embedding them in soil mortar 4.

[0032] The core material 2 has an H-shaped cross-section, with a web 21 that runs along the thickness direction of the underground continuous wall 1 and flanges 22 that run along the extension direction of the underground continuous wall 1 at both ends of the web 21, and male joints 20 are provided at both ends of the flanges 22. The male joint 20 has a T-shaped horizontal cross section, with plate-shaped retaining pieces 201 extending outwards in the thickness direction of the underground continuous wall 1 from the tip of a plate-shaped extension piece 200 that extends outwards in the extension direction of the underground continuous wall 1 from the flange 22.

[0033] The core material 3 has an H-shaped cross-section, with a web 31 that runs along the thickness direction of the underground continuous wall 1 and flanges 32 that run along the extension direction of the underground continuous wall 1 at both ends of the web 31, and female joints 30 are provided at both ends of the flanges 32.

[0034] The female joint 30 has a C-shaped horizontal cross-section in which a slit 300 is formed facing outward in the direction of extension of the underground continuous wall 1, and an internal cavity 301 is formed inside the slit. The slit 300 allows the extension piece 200 of the male joint 20 to be inserted, but the retaining piece 201 cannot pass through. The internal cavity 301 is sized to accommodate the retaining piece 201. The lower end of the internal cavity 301 of the female joint 30 is open, forming a lower end opening 30a with a C-shaped cross-section.

[0035] As shown in Figures 2 and 3, when installing the already erected diaphragm wall 1 by connecting the female joint 30 of the core material 3 (the other core material) to the male joint 20 of the core material 2 (one core material), the attached material removal tool 5 is used.

[0036] As shown in Figure 4, the deposit removal tool 5 has a main body 50 which includes a flat upper surface 50a and a flat lower surface 50b, and the lower surface 50b has an outer diameter smaller than the outer diameter of the upper surface 50a, forming a frustoconical shape. The outer surface 50c of the main body 50 is tapered. That is, the main body 50 has a tapered surface 50c that narrows downwards.

[0037] The main body portion 50 has a notch portion 51 that opens to the side surface 50c and extends from the upper surface 50a to the lower surface 50b. The notch 51 has a T-shaped horizontal cross-section similar to the cross-section of the male joint 20, surrounds the extended piece 200 and retaining piece 201 of the male joint 20 which are located in the internal cavity 301, and can be slidably engaged with the male joint 20 along the longitudinal direction of the male joint 20.

[0038] As shown in Figure 5, the upper surface 50a of the main body portion 50 abuts against the lower end opening 30a of the C-shaped cross-section of the female joint 30, forming a lower end opening abutment portion. The outer diameter of the upper surface 50a is larger than the outer diameter of the inner cavity 301 of the female joint 30. That is, the outer shape of the lower end opening abutment portion is formed to be larger than the inner shape of the lower end opening 30a, except for the notch portion 51.

[0039] Furthermore, the outer diameter of the upper surface 50a of the main body 50 is slightly larger than the outer diameter of the lower end opening 30a of the female joint 30. In other words, the outer shape of the lower end opening contact portion is formed to be larger than the outer shape of the lower end opening 30a, except for the notched portion 51.

[0040] The horizontal cross-section of the notch 51 is made slightly larger than the horizontal cross-section of the male joint 20 to create a clearance between the male joint 20 and the notch 51, in order to allow smooth sliding along the longitudinal direction of the male joint 20 of the deposit removal tool 5. However, if the clearance is made too large, a large amount of deposits will enter, so it should be adjusted as appropriate.

[0041] Inside the notch 51, projections 501 are formed along the entire length in the vertical direction on both side walls 500 (surfaces that sandwich the plate-like portion from both sides) that face each other, sandwiching the extension piece 200 of the male joint 20. The tips of the projections 501 abut against the extension piece 200. Since there is no projection on the side wall 500 facing the retaining piece 201, the male joint 20 and the adhering material removal tool 5 can be adjusted in position by the amount of clearance in the extension direction of the extension piece 200, increasing the degree of freedom during installation.

[0042] Alternatively, the projections 501 may be formed on the side walls 500 of the male joint 20 that are opposite each other, with the retaining piece 201 in between, so that their tips abut against the retaining piece 201. In this case, if no protrusion is provided on the side wall 500 facing the extension piece 200, the male joint 20 and the deposit removal tool 5 can be adjusted in position by the amount of clearance in the extension direction of the retaining piece 201, increasing the degree of freedom during installation.

[0043] Furthermore, while it is preferable for the adhering material removal tool 5 to be made of steel, similar to the core materials 2 and 3, to reduce manufacturing costs, it may be formed by molding a hollow case consisting of multiple concentric outer shells and multiple ribs separating the outer shells from hard plastic, and then filling the inside with mortar. In addition, making the ribs honeycomb-shaped in plan view will increase strength. Moreover, the hard plastic may be manufactured using a 3D printer.

[0044] The underground continuous wall 1 is constructed by sequentially connecting core materials 2 and 3 within soil mortar 4 prepared in the excavated section 10 of the excavated ground. As shown in Figures 2 and 3, the adhering material removal tool 5 is used when installing a core material 3 (another core material) having a female joint 30 to a core material 2 (one core material) having a male joint 20 of an already installed underground continuous wall 1.

[0045] The notched portion 51 of the deposit removal tool 5 is fitted and attached to the upper end of the male joint 20 of the already erected core material 2. The cross section of the notched portion 51 has a clearance greater than the cross section of the male joint 20, but the projection 501 contacts the extended piece 200 by sandwiching it, so it does not descend once attached to the upper end.

[0046] Next, the core material 3 is erected so as to connect the female joint 30 of the core material 3 to the already erected male joint 20. Specifically, the core material 3 is erected so that the extension piece 200 of the male joint 20 is inserted into the slit 300 of the female joint 30, and the extension piece 200 is inserted into the internal cavity 301.

[0047] At this time, the upper surface 50a of the deposit removal tool 5 attached to the male joint 20 comes into contact with the lower end opening 30a of the female joint 30. Adhesive or double-sided tape may be applied to the upper surface 50a of the deposit removal tool 5 to secure it to the lower end opening 30a. This adhesive or double-sided tape corresponds to the attachment portion formed on the upper surface 50a for attachment to the lower end opening 30a. By providing a mounting section, the material removal tool 5 does not shift from the female joint 30 when the core material 3 is erected, and the material removal tool 5 does not separate from the core material 3 even with vibrations from a vibro-hammer used during erection or movement of the core material 3 in the pulling direction when re-nailing, thus preventing the removed material from entering the internal cavity 301 of the female joint 30 through the lower end opening 30a.

[0048] Alternatively, the material removal tool 5 may be attached to the lower end opening 30a of the female joint 30 first, and then the cross section of the notch 51 may be slid to match the cross section of the male joint 20 of the core material 2 to install the core material 3.

[0049] As the core material 3 is erected, the deposit removal tool 5 also slides downward along the longitudinal direction of the male joint 20 (Figure 3). This removes soil and other debris attached to the male joint 20 of the core material 2. Since the deposit removal tool 5 has tapered sides 50c, there is little resistance when erecting it and the deposit removal effect is high. Furthermore, since the lower surface 50b of the adhering material removal tool 5 is flat, the tip is less likely to be damaged during installation.

[0050] The outer shape of the upper surface 50a of the deposit removal tool 5, which is the contact portion with the lower end opening, is larger than the inner shape of the lower end opening 30a of the female joint 30, except for the notch 51. Therefore, when installing the core material 3, it is possible to prevent the removed deposits from entering the internal cavity 301 from the lower end opening 30a of the female joint 30. The outer shape of the upper surface 50a, which is the contact portion of the lower end opening of the deposit removal tool 5, is larger than the outer shape of the lower end opening 30a of the female joint 30, except for the notch 51. Therefore, the frictional resistance applied to the female joint 30 of the core material 3 as it descends following the deposit removal tool 5 can be reduced, allowing for smoother installation.

[0051] The notch 51 of the deposit removal tool 5 is formed to create a clearance between it and the male joint 20. Therefore, during installation, the pressure on the side surface 50c may cause the portion opening to the side surface 50c to deform or become damaged. This tendency is particularly high when the side surface 50c has a tapered side that narrows downwards. The side walls 500 that sandwich the extension piece 200 of the male joint 20 in the notch 51 from both sides have projections 501 that contact the extension piece 200. This allows for smooth sliding during installation, and the projections 501 contact the extension piece 200, preventing it from deforming inward towards the notch 51 due to the pressure on the side surface 50c, thus preventing damage.

[0052] [Second Embodiment] A second embodiment of the present invention will be described below with reference to Figures 6 and 7. Note that the same parts as in the first embodiment will not be described, and only the differences will be explained.

[0053] As shown in Figures 6 and 7, a C-shaped protrusion 52 is integrally formed on the upper surface 50a of the main body 50 of the deposit removal tool 5, which is the contact area with the lower end opening. The outer diameter of the protrusion 52 is slightly larger than the inner diameter of the internal cavity 301 of the female joint 30, and a guide surface 520 is formed on the upper outer circumference of the protrusion 52, which slopes inward as it extends upward. As shown in Figure 7, the deposit removal tool 5 is fixed to the female joint 30 by forcibly fitting and engaging the protrusion 52 with the inner circumference of the lower end opening 30a of the female joint 30. This protrusion 52 corresponds to the mounting portion for attachment to the lower end opening 30a formed on the upper surface 50a.

[0054] [Third Embodiment] A third embodiment of the present invention will be described below with reference to Figures 8 to 10. Note that parts similar to those in the first and second embodiments will be omitted from the description, and only the differences will be explained.

[0055] The adhering material removal tool of this embodiment is made of mortar. The adhering material removal tool is formed by filling a formwork with mortar. In addition, reinforcing material is embedded inside the adhering material removal tool.

[0056] Figure 8 is a perspective view of the deposit removal tool 5. The deposit removal tool 5 has a main body portion 50 and a notched portion 51. In this embodiment, it does not have a protrusion as in the second embodiment, but it may have one.

[0057] The main body 50 has an upper surface 50a and a lower surface 50b. In addition, a cylindrical surface 50c2 is formed on the side surface 50c in addition to the tapered side surface 50c1. The cylindrical surface 50c2 is a side surface that is formed in a cylindrical shape downward from the upper surface 50a and is formed between the upper surface 50a and the tapered side surface 50c1.

[0058] The notch 51, formed across the upper surface 50a and the lower surface 50b, opens to the tapered side surface 50c1 and the cylindrical surface 50c2.

[0059] Inside the notch 51, projections 501 are formed on both side walls 500 facing each other with respect to the extension piece 200 of the male joint 20, extending along the entire length in the vertical direction. The function of the projections 501 is the same as that of the projections in the first and second embodiments.

[0060] The deposit removal tool 5 has a cylindrical surface 50c2 on its side surface 50c. Compared to the configurations of the first and second embodiments, in which the entire side surface of the deposit removal tool 5 is formed as a tapered surface, this configuration allows for a thickness equal to the height of the cylindrical surface 50c2 in the vertical direction, preventing the deposit removal tool 5 from cracking due to the upward force it receives when the core material is erected. Furthermore, since the thickness of the side surface 50c and the notched portion 51 can be made uniform, the material removal tool 5 can be prevented from cracking due to the lateral force it receives from the male joint 20 when the core material is erected.

[0061] Figure 9 is an exploded perspective view showing an example of a mold for manufacturing the deposit removal tool 5. The mold 6 includes a first outer frame 61, a second outer frame 62, and an inner frame 63. The first outer frame 61, the second outer frame 62, and the inner frame 63 are each formed from synthetic resin. The first outer frame 61, the second outer frame 62, and the inner frame 63 are each formed, for example, by a 3D printer.

[0062] Since the first outer frame 61 and the second outer frame 62 are divided into two parts and formed symmetrically, the first outer frame 61 will be explained, and the explanation of the second outer frame 62 will be omitted.

[0063] The first outer frame 61 has two flanges 611 that protrude outward along the mating surface with the second outer frame 62. Each flange 611 has two holes 612 formed in it.

[0064] The surfaces forming the outer shape of the deposit removal tool 5 of the first outer frame 61 include a cylindrical surface 613, a tapered surface 614, and a lower surface 615. The cylindrical surface 613 is the surface that forms the cylindrical surface 50c2 of the main body 50, the tapered surface 614 is the surface that forms the tapered side surface 50c1 of the main body 50, and the lower surface 615 is the surface that forms the lower surface 50b of the main body 50.

[0065] Two positioning recesses 616 are formed on the mating surface between one flange 611 of the first outer frame 61 and the second outer frame 62. Pins 631 of the inner frame 63 are inserted into the recesses formed by the positioning recesses 616 of the first outer frame 61 and the positioning recesses of the second outer frame 62.

[0066] An elongated recess 617 is formed on the lower surface 615 of the first outer frame 61, opening to the lower surface side of the second outer frame 62. When the first outer frame 61 and the second outer frame 62 are assembled, the elongated recess 617 connects with an elongated recess provided on the lower surface 625 of the second outer frame 62. Then, an elongated protrusion (not shown) provided on the lower surface of the inner frame 63 is fitted into the connected elongated recess to align it.

[0067] The inner frame 63 is a component for forming the notch 51 of the main body 50. The inner frame 63 has a T-shaped horizontal cross-section similar to the cross-section of the male joint 20. The inner frame 63 also has a recess 632 formed therein for forming the projection of the main body.

[0068] The inner frame 63 is provided so as to be in contact with the mating surface side of one flange 611, 621 of the first outer frame 61 and the second outer frame 62, over a portion of the cylindrical surface 613, 623 and the tapered surface 614, 624, and over a portion of the lower surface 615, 625 of the first outer frame 61 and the second outer frame 62.

[0069] Pins 631 are provided on the sides of the inner frame 63 that are in contact with the cylindrical surfaces 613, 623 and the tapered surfaces 614, 624, respectively. The lower surface of the inner frame 63 is provided with an elongated protrusion (not shown).

[0070] Figure 10A is a perspective view of the assembled formwork 6. Figure 9B is a plan view of the assembled formwork 6. The first outer frame 61 and the second outer frame 62 are assembled so as to sandwich the inner frame 63.

[0071] The two pins 631 of the inner frame 63 are inserted into recesses formed by the positioning recess 616 of the first outer frame 61 and the positioning recess of the second outer frame 62, respectively. This positions and fixes the inner frame 63 relative to the first outer frame 61 and the second outer frame 62.

[0072] Furthermore, the elongated protrusion (not shown) formed on the inner frame 63 is fitted into the elongated recess formed by the elongated recess 617 and the second elongated recess (not shown) of the first outer frame 61. This also positions and fixes the inner frame 63 relative to the first outer frame 61 and the second outer frame 62.

[0073] When the first outer frame 61 and the second outer frame 62 are assembled together, each hole 612 in the first outer frame 61 and each hole 622 in the second outer frame 62 form a single continuous hole. The first outer frame 61, the second outer frame 62, and the inner frame 63 are fixed together by inserting bolts, for example, into these holes and securing the inserted bolts with nuts.

[0074] As shown in Figure 10, a space for pouring mortar is formed in the assembled formwork 6. Reinforcement material 7 is placed in this space beforehand. Reinforcement material 7 is, for example, wire mesh. After the reinforcing material 7 is in place, mortar is poured. While non-shrink mortar is preferable, it is not limited to this type.

[0075] After proper curing, the formwork 6 is removed, and the adhering material removal tool 5 is completed.

[0076] As described above, the adhering material removal tool 5 of this embodiment is made of mortar. This increases the strength of the adhering material removal tool 5.

[0077] Furthermore, a reinforcing material 7 is embedded in the deposit removal tool 5. This further increases its strength and prevents cracking of the deposit removal tool 5.

[0078] Furthermore, the reinforcing material 7 is made of wire mesh. This allows the reinforcing material 7 to be manufactured inexpensively and easily.

[0079] [Other variations] The present invention is not limited to the embodiments described above. For example, the following are also included.

[0080] In this embodiment, the cross-section of the wall member is H-shaped, but other cross-sectional shapes are also possible. Furthermore, although the male joint has a T-shaped cross-section and the female joint has a C-shaped cross-section, it is not limited to these. Moreover, even if the male and female joints have cross-sections that are symmetrical around the connecting central axis, if one core material has an internal cavity and a slit, it corresponds to a female joint, and if the other core material has an extension piece and a retaining piece, it corresponds to a male joint.

[0081] In this embodiment, the core material was described as being embedded in soil mortar, but it may also be embedded in a stabilizing liquid or in the ground.

[0082] In this embodiment, the deposit removal tool was frustoconical in shape with a flat bottom surface, but it is not limited to this, and the main body may have a pointed tip. Also, in this embodiment, the deposit removal tool had tapered surfaces on its sides, but it is not limited to this, and it may be cylindrical. Furthermore, in this embodiment, the deposit removal tool was circular in plan view to match the female fitting, but it is not limited to this. Any external shape is acceptable as long as it is larger than the inner shape of the lower end opening that forms the opening at the lower end of the internal part of the female fitting.

[0083] In this embodiment, a clearance is formed between the notch and the male joint, but this is not limited to this. If the deposit removal tool is designed to slidably engage with the male joint along its longitudinal direction, a clearance does not need to be formed. In that case, a projection does not need to be provided.

[0084] In this embodiment, a mounting portion for attaching the deposit removal tool to the female joint is formed, but it is also possible not to attach it. Furthermore, although the mounting portion is fixed by adhesive or interlocking, it may be fixed by other means such as welding.

[0085] In the second embodiment, the adhering material removal tool has a continuous C-shaped protrusion on its upper surface that fits into the inner circumference of the female joint. However, multiple protrusions may be provided intermittently on the upper surface to fit into the female joint. Alternatively, the protrusions may be provided on all parts of the female joint that face the internal cavity, except for the notched portion.

[0086] In the third embodiment, the protrusion 52 of the second embodiment is not provided, but it may be provided. If a protrusion is provided in the third embodiment, for example, it may be provided by molding mortar. Alternatively, instead of creating the protrusions using the same material as the main body, i.e., mortar, the protrusions can be formed by embedding a separate component, such as a protrusion molded from synthetic resin, into the mortar before it hardens, causing a portion to protrude. This method is easier to implement than finishing the mortar. Furthermore, the reinforcing material 7 (for example, wire mesh) embedded inside the main body may be made to protrude from the top surface, thereby forming a protrusion. The reinforcing material can be used in conjunction with the protrusion without the need to provide a separate component for the protrusion.

[0087] Each technical aspect of any embodiment may be applied to other embodiments to form examples. [Explanation of symbols]

[0088] 1. Underground continuous wall 10 Excavation Section 2 Core material 20 Male joint 200 Extension piece 201 Retaining piece 21 Web 22 Flange 3 Core material 30 Female fittings 300 slits 31 Web 32 flange 4. Soil mortar 5. Tool for removing attached substances 50 Main body 51 Notch 500 side wall 501 Protrusion 52 Convex part 520 Guide surface 6 formwork 61 First outer frame 62. Second outer frame 63 Inner frame 7. Reinforcement material

Claims

1. A material removal tool for removing material adhering to one core material of a continuous underground wall, which is constructed by connecting the female joint of another core material to the male joint of one core material that has already been installed, The main body portion is formed including mortar and has a lower end opening contact portion that abuts against the lower end opening that forms an opening at the lower end of the internal part of the female joint, A reinforcing material embedded in the main body, The main body is formed with a notch that surrounds the portion of the male joint that is positioned in the internal cavity of the female joint, and that engages with the male joint in a slidable manner along the longitudinal direction, The outer shape of the lower end opening contact portion is larger than the inner shape of the lower end opening, except for the notched portion. A tool for removing deposits from core materials, characterized by the following features.

2. The main body has tapered sides that narrow downwards, The outer shape of the lower end opening contact portion is larger than the outer shape of the lower end opening portion, except for the notched portion. The core material attachment removal tool according to feature 1.

3. The main body has tapered sides that narrow downwards, and its bottom surface is flat. A tool for removing deposits from a core material according to claim 1 or 2.

4. The notch is formed so as to create a clearance between it and the male joint. On the surfaces of the notched portion that sandwich the plate-shaped portion of the male joint from both sides, protrusions are formed that are in contact with the plate-shaped portion. A tool for removing deposits from a core material according to claim 1 or 2.

5. The core material adhering removal tool according to claim 1 or 2, characterized in that an attachment portion for attachment to the lower end opening is formed in the lower end opening contact portion.

6. The core material adhering removal tool according to claim 5, characterized in that the mounting portion has a protrusion that engages with the lower end opening.

7. The main body is made of mortar, as described in claim 1 or 2, for removing deposits from a core material.

8. The core material removal tool according to claim 1 or 2, characterized in that the reinforcing material is a wire mesh.

9. The core material adhering removal tool according to claim 1 or 2, wherein the main body portion is provided with cylindrically formed sides.

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