Formwork holding cone

Abstract

To provide a form-retaining cone used in the construction of concrete walls, and a socket used to remove the cone. [Solution] A formwork retaining cone (100) having a through hole portion (H), at least a portion of the opening cross section of which has a shape having n curved portions (22a, 22b, 22c, 22d, 22e, 22f) (n is a natural number greater than or equal to 3) arranged at intervals in the circumferential direction, and n linear portions (23a, 23b, 23c, 23d, 23e, 23f) connecting adjacent curved portions, and which is less likely to cause localized stress concentration when removed from a concrete wall, and a socket used to remove the cone.

Description

[Technical Field]

[0001] This invention relates to a formwork retaining cone (hereinafter sometimes simply referred to as a "cone") used in the construction of concrete walls, and a socket used to remove the cone. [Background technology]

[0002] There are two types of cones used in the construction of concrete walls: those that are embedded directly into the concrete wall, and those that are removable. Of these, removable cones usually have a hexagonal hole into which a socket that corresponds to the shape of the hole is inserted, allowing them to be removed from the concrete wall (see Patent Document 1 and Non-Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-056824 [Non-patent literature]

[0004] [Non-Patent Document 1] Kondotec Co., Ltd. website https: / / www.kondotec.co.jp / products / frame / 09203TC05050.html

[0005] However, with cones with hexagonal holes, stress is concentrated at the corners when the concrete hardens, which can cause chipping. Metal or alloy cones are often used repeatedly, so chipping at the corners can reduce the durability of the cone and even cause damage to the cone itself. Furthermore, with cones with circular holes, there is a risk that the cone will not fit securely into the socket. DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0006] The present invention was made in consideration of the above circumstances, and its object is to provide a cone that is less likely to cause localized stress concentration when removed from a concrete wall, and a socket used to remove the cone. [Means for solving the problem]

[0007] The present invention has the following configuration.

[0008] (1) A formwork holding cone having a through hole portion, and at least a portion of the opening cross section of the through hole portion has a shape having n curved portions (n ​​is a natural number greater than or equal to 3) arranged at intervals in the circumferential direction, and n linear portions connecting adjacent curved portions.

[0009] (2) A formwork holding cone having the configuration described in (1) above, wherein n is 5 or 6.

[0010] (3) A formwork holding cone having the configuration described in (1) or (2) above, wherein the curved portion is arc-shaped.

[0011] (4) A formwork holding cone having the configuration described in any one of (1) to (3) above, wherein the curved portions are arranged at equal intervals.

[0012] (5) A formwork holding cone having the configuration described in any one of (1) to (4) above, at least a portion of which is made of metal or an alloy.

[0013] (6) A form-holding cone having the configuration described in any one of (1) to (5) above, which is provided with a socket engaging portion that engages with a socket having a shape corresponding to the through-hole portion.

[0014] (7) A socket used in a formwork holding cone described in any one of (1) to (5) above, wherein the cross section perpendicular to the axis of the portion that engages with the through hole portion of the formwork holding cone has a shape corresponding to the opening cross section. [Effects of the Invention]

[0015] The cone of this invention is less likely to experience localized stress concentration when removed from a concrete wall, preventing chipping of the cone. This improves the durability of the cone and increases the number of times it can be used repeatedly. Furthermore, the socket of this invention makes it possible to easily remove the cone while preventing chipping. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a schematic perspective view of a cone according to an embodiment of the present invention; [Figure 2] 1 is a schematic view of one opening (opening 2) of the cone of the embodiment as viewed from the axial direction. [Figure 3] FIG. 2 is a schematic internal structural view of the cone of the embodiment as viewed from a direction perpendicular to the axis. [Figure 4] FIG. 2 is a schematic diagram showing a usage form of the cone of the embodiment. [Figure 5] FIG. 2 is a schematic perspective view of a socket used to remove the cone according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0017] An embodiment of the present invention will be described below with reference to the drawings.

[0018] 1. Corn 100 The cone 100 of this embodiment is used to hold a form when casting a concrete wall or the like, and as shown in Fig. 1, has a conical main body 1 having a through-hole H. The main body 1 also has openings 2 and 3.

[0019] In this specification, a predetermined region of the main body 1 extending from the opening 2 toward the opening 3 in the axial direction (A) is referred to as a region 24. In this embodiment, the region where the socket locking portion 21 is provided is the same as the region 24.

[0020] As shown in FIG. 3, the opening 2 has a socket engaging portion 21 that engages with the socket, and the opening 3 has a separator engaging portion 31 that engages with the separator S.

[0021] As shown in Figure 4, cones 100 are used in pairs, and when casting a concrete wall or the like, a separator is inserted through each opening 3 and engaged with the separator engagement portion 31, and each opening 2 is positioned so as to contact the formwork. Then, after the concrete poured into the formwork has hardened, cones 100 are removed from the concrete wall by the sockets.

[0022] The size of the main body 1, that is, the length and width in the axial direction (A), is not particularly limited and may be changed appropriately depending on the size of the concrete wall to be cast, etc.

[0023] At least a part of the main body 1, for example, the socket engaging portion 21, is made of metal or an alloy. However, the entire main body 1 may be made of metal or an alloy, particularly iron.

[0024] In this embodiment, the opening cross section (inner cross section of the socket engagement portion 21) of the through hole portion H in region 24 of the main body portion 1 has a shape having six curved portions (22a, 22b, 22c, 22d, 22e, 22f) arranged at equal intervals in the circumferential direction C, and six linear portions (23a, 23b, 23c, 23d, 23e, 23f) connecting adjacent curved portions. That is, as shown in FIG. 2, linear portion 23a connects curved portion 22a and curved portion 22b, linear portion 23b connects curved portion 22b and curved portion 22c, linear portion 23c connects curved portion 22c and curved portion 22d, linear portion 23d connects curved portion 22d and curved portion 22e, linear portion 23e connects curved portion 22e and curved portion 22f, and linear portion 23f connects curved portion 22f and curved portion 22a.

[0025] The shape and curvature of the curved portions 22a to 22f are not particularly limited, and may be an arc shape, for example, a semicircular shape as in this embodiment. The dimensions (radius of curvature, etc.) of each curved portion are also not particularly limited, and can be adjusted appropriately depending on the application. The shapes of the curved portions may all be the same, or some may be different. It is also preferable that the curved portions are arranged at equal intervals.

[0026] The shape of the linear portions 23a to 23f is not particularly limited, and may be curved as in this embodiment. That is, in this specification, the term "linear" is not limited to a straight line, but also includes a gentle curve with a larger radius of curvature than the curved portions 22a to 22f. The length of each linear portion is not particularly limited and can be adjusted appropriately depending on the application. The shapes of the linear portions may all be the same or some may be different.

[0027] 2. Socket 200 5, socket 200 of this embodiment has tip portion 4, which is the portion inserted into through-hole portion H from opening 2 of cone 100, having a shape corresponding to socket engaging portion 21 of cone 100. That is, the cross section of tip portion 4 in a direction perpendicular to the axis is similar in shape to the opening cross section of region 24 of cone 100, and has portions corresponding to curved portions (22a, 22b, 22c, 22d, 22e, 22f) and linear portions (23a, 23b, 23c, 23d, 23e, 23f) of cone 100.

[0028] 3.Effects When the cone 100 having the above configuration is removed from a concrete wall using the socket 200, the force applied by the rotation of the socket is easily dispersed among the curved portions. This makes it difficult for stress to concentrate locally at the socket engagement portion 21, making it possible to prevent damage to the cone 100. Furthermore, because the curved portions are connected by the linear portions, the load on the intersections of the curved portions can also be reduced.

[0029] In particular, in this embodiment, the curved portions of the cone 100 have the same shape and are arranged at equal intervals. This makes it easier for the rotational torque of the socket to be more evenly distributed on the inner circumferential surface of the socket engaging portion 21, and it is possible to further prevent stress concentration. This is expected to shorten the time required to remove the cone 100, reduce wear on the socket, and increase the number of times the cone can be reused.

[0030] Furthermore, such a cone 100 is less likely to break even when the rotational torque of the socket 200 is increased, making it easy to remove from the concrete wall. Furthermore, the cone 100 can be suitably used when molding a thick concrete wall, i.e., a concrete wall with large internal stress.

[0031] Furthermore, by using the socket 200 having the above configuration, the cone 100 can be easily removed from the concrete wall while preventing damage to the cone 100. Furthermore, since the load on the socket 200 is distributed, damage to the socket 200 itself can also be prevented.

[0032] 4. Variations (i) The number of curved portions and linear portions in the cross-sectional shape of the opening of region 24 of cone 100 is six, but the number is not particularly limited as long as it is three or more. However, considering the balance between the effect of dispersing stress generated in socket engaging portion 21 and processability, the number of curved portions and linear portions is preferably five or six.

[0033] (ii) In cone 100, the cross-sectional shape of opening 2 and the cross-sectional shape of through-hole portion H in region 24 are the same, but the cross-sectional shape of opening 2 may be different. That is, for example, the cross-sectional shape of the opening may be circular without providing socket engaging portion 21 in a predetermined region from opening 2 toward opening 3, and the region closer to opening 3 than that may be provided with socket engaging portion 21.

[0034] (iii) The shape of each curved portion is not limited to a circular arc, but may be an elliptical arc, a parabolic arc, a compound curve, etc. Furthermore, the radius of curvature of each curved portion may be constant or may vary in parts.

[0035] (iv) Each linear portion is not limited to a straight line or a gently curved line, but may be a broken line or a combination of straight lines and curves.

[0036] (vi) The material of the main body 1 is not limited to metals and alloys, but may be fiber-reinforced resin or high-strength plastic, which allows the weight and cost of the cone 100 to be reduced.

[0037] (vii) The tip 4 of the socket 200 may be provided with a tapered portion to improve insertion. In addition, the outer periphery of the tip 4 of the socket 200 may be provided with an uneven anti-slip surface, and may be configured to be compatible with a ratchet mechanism.

[0038] (viii) In this embodiment, the shape of each linear portion is a semicircular shape that protrudes outward, but it may also be a semicircular shape that protrudes inward. In this case, it is desirable that the intersection of each curved portion and each linear portion has a rounded shape.

[0039] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0040] 100...corn 1...Main body 2,3...Opening 200...socket

Claims

1. A formwork holding cone having a through hole portion, at least a portion of the opening cross section of which has a shape having n curved portions (n ​​is a natural number greater than or equal to 3) arranged at intervals in the circumferential direction, and n linear portions connecting adjacent curved portions.

2. 2. The formwork holding cone according to claim 1, wherein n is 5 or 6, and the curved portion is arc-shaped.

3. The form-holding cone according to claim 1 or 2, further comprising a socket engaging portion that engages with a socket having a shape corresponding to the through-hole portion.

Images