Attachment Remover for Core Material of Submerged Continuous Wall

Abstract

To provide an accretion removal tool of a core material of an underground continuous wall which removes an accretion attached to a male joint and prevents entry of a foreign matter to the inside of a female joint, and is easily constructed and dispenses with a device for special construction.SOLUTION: An accretion removal tool 5 for removing an accretion attached to a core material 2 of an underground continuous wall used when a female joint 30 of a core material 3 is connected to a male joint 20 of a core material 2 of a previously built underground continuous wall includes a body part 50 having an upper surface 50a in contact with a lower end opening 30a of an inner space part 301 of the female joint 30, and a notch part 51 which surrounds a retaining piece 201 and an extension piece 200 of the male joint 20 and is slidably engaged in a longitudinal direction of the male joint 20, wherein an outer shape of the upper surface 50a is larger than an inner shape of a lower end opening 30a other than the notch part 51.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a soil removing tool for removing soil, 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. In a diaphragm wall using a core material, an H-shaped core material having male joints or female joints at both ends of the flange is connected to each other at the joint part in the excavated part of the excavated ground, and a plurality of them are built in, and the periphery thereof is filled with a filler for construction.

[0003] As a specific construction method, there are 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 excavating, and a method of constructing soil mortar by the in-situ soil mixing method 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 the female joint to the male joint of the already built core material and building the core material, if soil or the like adheres to the male joint, the adherent will enter the inside of the female joint of the core material to be built, hinder the progress of the core material, and it may be 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 labor to pull up the core material, and the productivity at the site is greatly reduced. · If the core material that cannot be built in is forcibly pulled out, the joints of the core materials built in advance may be deformed or damaged. · When the core material cannot be built to the normal position, there are adverse effects such as the inability to ensure the predetermined specifications of the diaphragm wall, or the need to reattach the coupler for reinforcing bar connection during the construction of the structure, or the deterioration of the quality of the structure.

[0006] Conventionally, as described in Patent Document 1, while excavating the ground, a male joint is inserted into the female joint in the excavated part, and a steel sheet pile wall member is built while connecting them. Then, the surrounding is filled with soil mortar, a guide hole is formed by drilling the soil mortar inside the female joint on the side of the unexcavated part of the ground, and while passing the guide material of the excavator through the guide hole, the excavator is lowered to dig deeper into the unexcavated part. While connecting the steel sheet pile wall member to the excavated part, a method of building it and filling the surrounding with soil mortar has been proposed.

[0007] According to this method of constructing a sheet pile wall, it is difficult for foreign matter to enter inside the joint when building the sheet pile wall member, and all the sheet pile wall members can be built at a stable height.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0009] However, the method of constructing a sheet pile wall as described in Patent Document 1 above does not connect and build a female joint to a male joint that has already been arranged. Instead, cumbersome operations such as shaving the soil mortar that has entered inside the joint to form a guide hole are required. This not only takes time and effort in construction, but also requires a special excavator equipped with a guide material. The problem to be solved by the present invention is to provide an attachment remover for the core material of a diaphragm wall that removes the attachments adhering to the male joint and prevents attachments such as earth and sand adhering to the male joint from entering the inside of the female joint, and moreover, is easy to construct and does not require special construction equipment.

Means for Solving the Problems

[0010] The invention according to claim 1 is an attachment removing tool for removing attachments adhering to a core material of a diaphragm wall used when connecting a male joint of one core material of an already constructed diaphragm wall to a female joint of another core material and constructing them. The attachment removing tool includes a main body portion having a lower end opening contact portion that contacts a lower end opening portion forming an opening at the lower end of the inner space of the female joint, and a notch portion formed in the main body portion that surrounds a portion of the male joint disposed in the inner space of the female joint and is slidably engaged along the longitudinal direction of the male joint. The outer shape of the lower end opening contact portion is larger than the inner shape of the lower end opening portion except for the notch portion, the main body portion includes a tapered side surface that narrows downward on the side surface, and 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 notch portion. It is an attachment removing tool for a core material characterized by this. The invention according to claim 2 is an attachment removing tool for removing attachments adhering to a core material of a diaphragm wall used when connecting a male joint of one core material of an already constructed diaphragm wall to a female joint of another core material and constructing them. The attachment removing tool includes a main body portion having a lower end opening contact portion that contacts a lower end opening portion forming an opening at the lower end of the inner space of the female joint, and a notch portion formed in the main body portion that surrounds a portion of the male joint disposed in the inner space of the female joint and is slidably engaged along the longitudinal direction of the male joint. The outer shape of the lower end opening contact portion is larger than the inner shape of the lower end opening portion except for the notch portion, the main body portion includes a tapered side surface that narrows downward on the side surface, and the lower surface of the main body portion is flat. It is an attachment removing tool for a core material characterized by this. The invention according to claim 3 is an attachment removing tool for removing attachments adhering to a core material of a diaphragm wall used when connecting a male joint of one core material of an already constructed diaphragm wall to a female joint of another core material and constructing it. The attachment removing tool includes a main body portion having a lower end opening contact portion that contacts a lower end opening portion forming an opening at the lower end of the inner cavity of the female joint, and a notch portion formed in the main body portion that surrounds a portion of the male joint disposed in the inner cavity of the female joint and is slidably engaged along the longitudinal direction of the male joint. The outer shape of the lower end opening contact portion is larger than the inner shape of the lower end opening portion except for the notch portion, and the notch portion is formed so as to have a clearance with the male joint. Protrusions that contact the plate-like portion are formed on the surfaces of the notch portion that sandwich the plate-like portion of the male joint from both sides. The attachment removing tool for a core material is characterized by this. The invention according to claim 4 is an attachment removing tool for removing attachments adhering to a core material of a diaphragm wall used when connecting a male joint of one core material of an already constructed diaphragm wall to a female joint of another core material and constructing it. The attachment removing tool includes a main body portion having a lower end opening contact portion that contacts a lower end opening portion forming an opening at the lower end of the inner cavity of the female joint, and a notch portion formed in the main body portion that surrounds a portion of the male joint disposed in the inner cavity of the female joint and is slidably engaged along the longitudinal direction of the male joint. The outer shape of the lower end opening contact portion is larger than the inner shape of the lower end opening portion except for the notch portion, and the lower end opening contact portion includes an attachment portion provided for being attached and fixed to the lower end opening portion. The attachment removing tool for a core material is characterized by this. The invention according to claim 5 is the attachment removing tool for a core material according to claim 4, characterized in that the attachment portion includes a convex portion that engages with the lower end opening portion. Also, the following may be another invention. Configuration 1 is a deposit remover for removing deposits adhering to a core material of a diaphragm wall used when connecting a female joint of another core material to a male joint of one core material of an already constructed diaphragm wall. The deposit remover includes a main body portion having a lower end opening contact portion that contacts a lower end opening portion forming an opening at the lower end of the inner cavity of the female joint, and a notch portion formed in the main body portion, surrounding a portion of the male joint disposed in the inner cavity of the female joint, and slidably engaged along the longitudinal direction of the male joint. 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 portion, and the main body portion is provided with a tapered side surface that narrows downward on the side surface. The deposit remover for the core material is characterized in that. Configuration 2 is characterized in that the outer shape of the lower end opening contact portion is larger than the outer shape of the lower end opening except for the notch portion. Configuration 1 The deposit remover for the core material according to. Configuration 3 is characterized in that the lower surface of the main body portion is a flat surface. Configuration 1 or Configuration 2 The deposit remover for the core material according to. Configuration 4An attachment remover for removing attachments adhering to a core material of a diaphragm wall used when connecting a male joint of one core material of an already constructed diaphragm wall to a female joint of another core material and constructing them. The attachment remover includes a main body portion having a lower end opening contact portion that contacts a lower end opening portion forming an opening at the lower end of the inner space of the female joint, and a notch portion formed in the main body portion that surrounds a portion of the male joint disposed in the inner space of the female joint and is slidably engaged along the longitudinal direction of the male joint. The outer shape of the lower end opening contact portion is larger than the inner shape of the lower end opening portion except for the notch portion, and the notch portion is formed so as to have a clearance with the male joint. Protrusions that contact the plate-like portion are formed on the surfaces of the notch portion that sandwich the plate-like portion of the male joint from both sides. The attachment remover for the core material is characterized by this. Configuration 5 An attachment remover for removing attachments adhering to a core material of a diaphragm wall used when connecting a male joint of one core material of an already constructed diaphragm wall to a female joint of another core material and constructing them. The attachment remover includes a main body portion having a lower end opening contact portion that contacts a lower end opening portion forming an opening at the lower end of the inner space of the female joint, and a notch portion formed in the main body portion that surrounds a portion of the male joint disposed in the inner space of the female joint and is slidably engaged along the longitudinal direction of the male joint. The outer shape of the lower end opening contact portion is larger than the inner shape of the lower end opening portion except for the notch portion, and an attachment portion for attaching and fixing to the lower end opening portion is formed in the lower end opening contact portion. The attachment remover for the core material is characterized by this. Configuration 6 The attachment portion includes a convex portion that engages with the lower end opening portion, which is characterized. Configuration 5 The attachment remover for the core material according to the above. Also, Furthermore The following may also be another invention. The means 1 is an attachment remover for removing attachments adhering to the core material of a diaphragm wall used when connecting the female joint of another core material to the male joint of one core material of an already constructed diaphragm wall. The attachment remover includes a main body portion having a lower end opening contact portion that contacts a lower end opening forming the opening at the lower end of the inner space of the female joint, and a notch portion formed in the main body portion that surrounds a portion of the male joint disposed in the inner space of the female joint and is slidably engaged along the longitudinal direction of the male joint. 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 portion, which is a characteristic of the attachment remover for the core material.

[0011] Means 2 is characterized in that the main body portion has a tapered side surface that narrows downward on the side surface, 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 notch portion. Means 1 It is the attachment remover for the core material according to the above.

[0012] Means 3 is characterized in that the main body portion has a tapered side surface that narrows downward on the side surface, and the lower surface is a flat surface. Means 1 or Means 2 It is the attachment remover for the core material according to the above.

[0013] Means 4 is characterized in that the notch portion is formed so as to have a clearance with the male joint, and protrusions that contact the plate-shaped portion are formed on the surfaces that sandwich the plate-shaped portion of the male joint from both sides of the notch portion. Any one of Means 1 to Means 3 It is the attachment remover for the core material according to the above.

[0014] Means 5 is characterized in that an attachment portion for attaching to the lower end opening is formed in the lower end opening contact portion. Any one of Means 1 to Means 4 It is the attachment remover for the core material according to the above.

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

Effect of the Invention

[0016] In the deposit remover for the core material of the present invention, the notch portion surrounds the portion disposed in the inner space of the female joint of the male joint and slidably engages along the longitudinal direction of the male joint. Since the outer shape of the lower end opening portion contact portion is larger than the inner shape of the lower end opening portion of the female joint except for the notch portion, it can be easily attached to the core material when building the core material, remove deposits such as earth and sand adhering to the male joint, and prevent deposits from entering the inner space from the lower end opening portion of the female joint.

[0017] In addition, since the main body portion has a tapered side surface that narrows downward on the side surface and the outer shape of the lower end opening portion contact portion is larger than the outer shape of the lower end opening portion except for the notch portion, the resistance during building can be reduced, the removal effect of deposits can be enhanced, and the frictional resistance applied to the female joint of the core material that descends following the deposit remover can be reduced.

[0018] In addition, since the main body portion has a tapered side surface that narrows downward on the side surface and the lower surface is a flat surface, the resistance during building can be reduced, the removal effect of deposits can be enhanced, and the tip of the deposit remover is less likely to be damaged when building the core material.

[0019] In addition, the notch portion is formed so as to have a clearance with the male joint, and protrusions that contact the plate-shaped portion are formed on the inner surfaces that sandwich the plate-shaped portion of the male joint from both sides of the notch portion. Therefore, it slides smoothly during building, and the protrusions contact the plate-shaped portion to regulate and prevent the deposit remover from being damaged by deforming inward of the notch portion due to the pressure received by the side surface.

[0020] In addition, since an attachment portion for attachment to the lower end opening is formed at the lower end opening contact portion, the deposit remover does not shift from the female joint when building the core material, and the deposit remover does not separate from the core material during the vibration when building the core material or the movement in the pulling-out direction during re-driving, preventing the removed deposits from entering the inner space of the female joint from the lower end opening.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0022] Hereinafter, embodiments of the present invention will be described with reference to the drawings and the like. Needless to say, the present invention is not limited to the embodiments.

[0023] 〔First Embodiment〕 The first embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 is a plan view of the diaphragm wall in which the first embodiment is used, and FIGS. 2, 3, and 4 are an exploded perspective view, a perspective view of the main part, and a plan view of the main part, respectively, when the deposit remover of the first embodiment is used for the core material.

[0024] As shown in FIG. 1, the diaphragm wall 1 is constructed by alternately connecting a core material 2 made of steel and having a male joint 20 and a core material 3 having a female joint 30 in an excavation trench (excavation section 10) formed by excavating the ground, by engaging the male joint 20 and the female joint 30, and building them into the soil mortar 4.

[0025] The core material 2 has an H-shaped cross-section with flanges 22 along the extension direction of the diaphragm wall 1 provided at both ends of a web 21 along the thickness direction of the diaphragm wall 1, and male joints 20 are provided at both ends of the flanges 22, respectively. The male joint 20 has a T-shaped horizontal cross-section with retaining pieces 201 extending from the tip of an extended piece 200 in the form of a plate that extends the flange 22 outward in the extension direction of the diaphragm wall 1 and extending in both sides in the thickness direction of the diaphragm wall 1.

[0026] The core material 3 has an H-shaped cross-section with flanges 32 along the extension direction of the diaphragm wall 1 provided at both ends of a web 31 along the thickness direction of the diaphragm wall 1, and female joints 30 are provided at both ends of the flanges 32, respectively.

[0027] The female joint 30 has a C-shaped horizontal cross-section with a slit 300 formed toward the outside in the extension direction of the diaphragm wall 1, and an inner cavity 301 formed inside the slit. The slit 300 allows the extended piece 200 of the male joint 20 to be inserted, but the retaining piece 201 cannot pass through. The inner cavity 301 has a dimension for accommodating the retaining piece 201. The lower end of the inner cavity 301 of the female joint 30 is open, and a lower end opening 30a with a C-shaped cross-section is formed.

[0028] As shown in FIGS. 2 and 3, when connecting and building 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) of the already built diaphragm wall 1, an attachment removing tool 5 is used.

[0029] As shown in FIG. 4, the attachment removing tool 5 has a main body portion 50 with a flat upper surface 50a and a flat lower surface 50b, and has a frustum shape with the outer diameter of the lower surface 50b smaller than the outer diameter of the upper surface 50a. The side surface 50c on the outer periphery of the main body portion 50 is tapered. That is, the main body portion 50 is provided with a tapered side surface that narrows downward on the side surface 50c.

[0030] A notch portion 51 that opens to the side surface 50c is formed in the main body portion 50 across the upper surface 50a to the lower surface 50b. The notch portion 51 has a T-shaped horizontal cross-section similar to the cross-section of the male joint 20, surrounds the extension piece 200 and the retaining piece 201 of the male joint 20 disposed in the inner cavity portion 301, and can be slidably engaged along the longitudinal direction of the male joint 20 and the male joint 20.

[0031] As shown in FIG. 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 abutting portion. The outer diameter of the upper surface 50a is larger than the outer diameter of the inner cavity portion 301 of the female joint 30. That is, the outer shape of the lower end opening abutting portion is formed so as to be larger than the inner shape of the lower end opening 30a except for the notch portion 51.

[0032] Also, the outer diameter of the upper surface 50a of the main body portion 50 is slightly larger than the outer diameter of the lower end opening 30a of the female joint 30. That is, the outer shape of the lower end opening abutting portion is formed so as to be larger than the outer shape of the lower end opening 30a except for the notch portion 51.

[0033] The horizontal cross-section of the notch portion 51 is formed to be slightly larger than the horizontal cross-section of the male joint 20 in order to smoothly move the sliding of the male joint 20 of the deposit removing tool 5 along the longitudinal direction, so that a clearance can be formed between the male joint 20. Note that if the clearance is formed too large, a large amount of deposits will penetrate, so it is adjusted appropriately.

[0034] Inside the notch portion 51, protrusions 501 are formed over the entire length in the vertical direction on both side walls 500 (the surfaces sandwiching the plate-like portion from both sides) facing each other with the extension piece 200 of the male joint 20 interposed therebetween. The tip of the protrusion 501 is in contact with the extension piece 200. Since the side wall 500 facing the retaining piece 201 is not provided with a protrusion, the male joint 20 and the attachment removing tool 5 can be positionally adjusted by the amount of clearance in the extending direction of the extending piece 200, increasing the degree of freedom during installation.

[0035] In addition, the protrusion 501 may be formed on both side walls 500 facing each other with the retaining piece 201 of the male joint 20 interposed therebetween, and the tip may be brought into contact with the retaining piece 201. In this case, if no protrusion is provided on the side wall 500 facing the extending piece 200, the male joint 20 and the attachment removing tool 5 can be positionally adjusted by the amount of clearance in the extending direction of the retaining piece 201, increasing the degree of freedom during installation.

[0036] Note that it is desirable that the attachment removing tool 5 be made of steel like the core materials 2 and 3. However, in order to reduce the production cost, a hollow case composed of a plurality of concentric outer shells and a plurality of ribs partitioning between the outer shells may be molded from hard plastic, and mortar may be filled therein. Further, if the ribs are in a honeycomb shape in plan view, the strength is increased. Furthermore, 3D printing may be used for the molding of the hard plastic.

[0037] The diaphragm wall 1 is constructed by sequentially connecting the core materials 2 and 3 in the soil mortar 4 formed in the excavated portion 10 of the excavated ground. As shown in FIGS. 2 and 3, the attachment removing tool 5 is used when connecting and installing the core material 3 (the other core material) having the female joint 30 to the core material 2 (one core material) having the male joint 20 of the already installed diaphragm wall 1.

[0038] The notch portion 51 of the attachment removing tool 5 is fitted and attached to the upper end of the male joint 20 of the already installed core material 2. Although the cross section of the notch portion 51 has a clearance from the cross section of the male joint 20, since the protrusion 501 abuts with the extending piece 200 interposed therebetween, it does not drop in the state of being attached to the upper end.

[0039] Next, the core material 3 is inserted so that the female joint 30 of the core material 3 is connected to the male joint 20 that has already been inserted. Specifically, the core material 3 is inserted such that the extending piece 200 of the male joint 20 is inserted into the slit 300 of the female joint 30 and the extending piece 200 is disposed in the inner hollow portion 301.

[0040] At this time, the upper surface 50a of the deposit removing tool 5 attached to the male joint 20 abuts against the lower end opening 30a of the female joint 30. At this time, an adhesive or double-sided tape may be provided on the upper surface 50a of the deposit removing tool 5 so as to be fixed to the lower end opening 30a. This adhesive or double-sided tape corresponds to an attachment portion for attaching to the lower end opening 30a formed on the upper surface 50a. By providing the attachment portion, the deposit removing tool 5 does not shift from the female joint 30 when the core material 3 is inserted, and the deposit removing tool 5 also does not separate from the core material 3 during vibration such as a vibro hammer used during insertion or movement of the core material 3 in the pulling-out direction during reinsertion, preventing the removed deposits from entering the inner hollow portion 301 of the female joint 30 from the lower end opening 30a.

[0041] Note that the deposit removing tool 5 may be first attached to the lower end opening 30a of the female joint 30, and then the core material 3 may be inserted by sliding the cross section of the notch portion 51 to match the cross section of the male joint 20 of the core material 2.

[0042] As the core material 3 is inserted, the deposit removing tool 5 also slides and descends along the longitudinal direction of the male joint 20. (Fig. 3) Thereby, earth and sand adhering to the male joint 20 of the core material 2 are removed. Since the deposit removing tool 5 has a tapered side surface on the side surface 50c, the resistance during insertion is small and the deposit removing effect is high. Further, since the lower surface 50b of the deposit removing tool 5 is flat, the tip is less likely to be damaged during insertion.

[0043] The outer shape of the upper surface 50a, which is the contact portion of the lower end opening of the deposit removing tool 5, is larger than the inner shape of the lower end opening 30a of the female joint 30 except for the notch portion 51. Therefore, when the core material 3 is built in, it is possible to prevent deposits removed from the lower end opening 30a of the female joint 30 from entering the inner cavity 301. The outer shape of the upper surface 50a, which is the contact portion of the lower end opening of the deposit removing tool 5, is larger than the outer shape of the lower end opening 30a of the female joint 30 except for the notch portion 51. Therefore, the frictional resistance applied to the female joint 30 of the core material 3 that descends following the deposit removing tool 5 can be reduced, and the building-in can be performed smoothly.

[0044] Since the notch portion 51 of the deposit removing tool 5 is formed so as to have a clearance with the male joint 20, when building in, the portion that opens on the side surface 50c may be deformed or damaged so as to shrink due to the pressure received by the side surface 50c. In particular, this tendency becomes higher when the side surface 50c has a tapered side surface that narrows downward. Since the side walls 500 that sandwich the extension piece 200 of the male joint 20 of the notch portion 51 from both sides are formed with protrusions 501 that contact the extension piece 200, it slides smoothly when building in, and the protrusions 501 contact the extension piece 200 and regulate the deposit removing tool 5 from deforming inward of the notch portion 51 due to the pressure received by the side surface 50c, preventing damage.

[0045] 〔Second Embodiment〕 Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. 6 and 7. Note that descriptions of parts similar to those of the first embodiment will be omitted, and mainly different parts will be described.

[0046] As shown in FIGS. 6 and 7, a convex portion 52 having a C shape in plan view is integrally formed on the upper surface 50a, which is the contact portion of the lower end opening of the main body portion 50 of the deposit removing tool 5. The outer diameter of the convex portion 52 is slightly larger than the inner diameter of the inner cavity 301 of the female joint 30, and a guide surface 520 that inclines inward as it goes upward is formed at the upper end of the outer periphery of the convex portion 52. As shown in FIG. 7, the deposit remover 5 is fixed to the female joint 30 by forcibly fitting and engaging the convex portion 52 with the inner periphery of the lower end opening 30a of the female joint 30. This convex portion 52 corresponds to an attachment portion for being attached to the lower end opening 30a formed on the upper surface 50a.

[0047] 〔Other Modification Examples〕 The present invention is not limited to the above-described embodiments. For example, the following are also included.

[0048] In this embodiment, the cross-section of the wall member is H-shaped, but it can also be other cross-sectional shapes. Further, 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 this. Furthermore, even if the male joint and the female joint have a symmetric cross-section about the connection central axis, as long as one core material has an inner cavity and a slit, it corresponds to the female joint, and as long as the other core material has an extension piece and a retaining piece, it corresponds to the male joint.

[0049] In this embodiment, the description has been made with the core material built into the soil mortar, but it may also be a stabilizing liquid or something built into the ground.

[0050] In this embodiment, the deposit remover has a frustum shape and the lower surface is flat, but it is not limited to this, and the main body part may have a pointed tip. Further, in this embodiment, the deposit remover has a tapered surface on the side, but it is not limited to this, and it may be a cylindrical shape. Furthermore, in this embodiment, the deposit remover is circular in plan view according to the female joint, but it is not limited to this. As long as it is larger than the inner shape of the lower end opening forming the opening at the lower end of the inner cavity of the female joint, it may have any outer shape.

[0051] In this embodiment, the notch is formed so as to have a clearance with the male joint, but it is not limited to this. As long as the deposit remover is slidably engaged along the longitudinal direction of the male joint, it is not necessary to form a clearance. In that case, it is not necessary to provide a protrusion.

[0052] In this embodiment, an attachment portion for attaching the deposit remover to the female joint is formed, but it may not be attached. Further, although the attachment portion is fixed by adhesion or concavo-convex fitting, it may be fixed by other means such as welding.

[0053] In the second embodiment, a convex portion continuous in a C shape is provided on the upper surface of the deposit remover and fitted to the inner circumference of the female joint. However, a plurality of intermittently provided convex portions may be provided on the upper surface and fitted to the female joint. Further, the convex portions may be provided on all portions facing the inner space of the female joint other than the notch portions.

[0054] Each technical matter in any of the embodiments may be applied to other embodiments as an example.

Explanation of Reference Numerals

[0055] 1 Diaphragm wall 10 Excavation part 2 Core material 20 Male joint 200 Extension piece 201 Retaining piece 21 Web 22 Flange 3 Core material 30 Female joint 300 Slit 31 Web 32 Flange 4 Soil mortar 5 Deposit remover 50 Body part 51 Notch part 500 Side wall 501 Protrusion 52 Convex part 520 Guide surface

Claims

An attachment remover for removing attachments adhering to a core material of a diaphragm wall used when connecting a female joint of another core material to a male joint of a core material of an already constructed diaphragm wall, a main body portion having a lower end opening contact portion that contacts an opening at the lower end of the inner cavity of the female joint, a notch portion formed in the main body portion, surrounding a portion disposed in the inner cavity of the female joint of the male joint, and slidably engaging along the longitudinal direction of the male joint, an outer shape of the lower end opening contact portion is larger than an inner shape of the lower end opening except for the notch portion, the main body portion has a tapered side surface that narrows downward on the side surface, an outer shape of the lower end opening contact portion is larger than an outer shape of the lower end opening except for the notch portion characterized by being an attachment remover for a core material. An attachment remover for removing attachments adhering to a core material of a diaphragm wall used when connecting a female joint of another core material to a male joint of a core material of an already constructed diaphragm wall, a main body portion having a lower end opening contact portion that contacts an opening at the lower end of the inner cavity of the female joint, a notch portion formed in the main body portion, surrounding a portion disposed in the inner cavity of the female joint of the male joint, and slidably engaging along the longitudinal direction of the male joint, an outer shape of the lower end opening contact portion is larger than an inner shape of the lower end opening except for the notch portion, the main body portion has a tapered side surface that narrows downward on the side surface, a lower surface of the main body portion is flat characterized by being an attachment remover for a core material.

3. An attachment remover for removing attachments adhering to a core material of a diaphragm wall used when connecting a female joint of another core material to a male joint of a core material of an already constructed diaphragm wall, A main body portion having a lower end opening contact portion that contacts a lower end opening portion forming an opening at the lower end of the inner cavity of the female joint; A notch portion formed in the main body portion, surrounding a portion of the male joint disposed in the inner cavity of the female joint, and slidably engaged along the longitudinal direction of the male joint; 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 portion; The notch portion is formed so as to provide a clearance with the male joint; Protrusions that contact the plate-shaped portion are formed on the surfaces of the notch portion that sandwich the plate-shaped portion of the male joint from both sides. An attachment removing tool for a core material, characterized by the above.

4. An attachment removing tool for removing attachments adhering to a core material of a diaphragm wall, which is used when connecting a female joint of another core material to a male joint of one core material of an already installed diaphragm wall, A main body portion having a lower end opening contact portion that contacts a lower end opening portion forming an opening at the lower end of the inner cavity of the female joint; A notch portion formed in the main body portion, surrounding a portion of the male joint disposed in the inner cavity of the female joint, and slidably engaged along the longitudinal direction of the male joint; 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 portion; The lower end opening contact portion includes an attachment portion provided for being attached and fixed to the lower end opening. An attachment removing tool for a core material, characterized by the above.

5. The attachment removing tool for a core material according to claim 4, wherein the attachment portion includes a convex portion that engages with the lower end opening.

Images