How to build a concrete wall using form ties

Abstract

By integrating a member for locking the form 51 with the form tie 1, the form 52 can be stably fixed and can be reused any number of times. [Solution] The shaft body 2 is equipped with a rod-shaped shaft having a locking disc portion 3 at one end which fits into a through hole opened in a formwork 51 for pouring concrete and secures the formwork 51, a male threaded portion 5 formed at the other longitudinal end of the shaft body 2 for fastening a washer 57 and a nut 58, and a separator connecting portion 4 formed continuously with the locking disc portion 3 side of the shaft body 2 and having a female threaded portion 7 into which the male threaded portion 5 of a separator 52 screws into.

Description

[Technical field]

[0001] The present invention relates to a method for constructing a concrete wall using Form-Tie (registered trademark), which functions as a form tightening metal fitting that tightens and holds the form when pouring concrete. [Background technology]

[0002] Conventionally, when constructing a concrete structure, as shown in Fig. 13, a pair of concrete forms (form panels) 51 made of steel plates, plywood, etc., and a form separator 52 for maintaining the internal space of the form 51 at a specified dimension are used to harden the ready-mixed concrete into a desired shape. The separator 52 is a steel rod-like member with threads on both ends for fixing the form 51. A pair of P cones are attached to both ends of the separator 52 to support the form 51 from the inside. (Registered Trademark) 53 is attached to fix and hold the formwork 51, and the formwork is assembled.

[0003] The P-con 53 is a generally conical synthetic resin-made formwork holder. The P-con 53 is a holder with a female thread, one side of which is screwed to the separator 52, and the other side of which is screwed to the male thread. The male thread is screwed to the female thread of a connector 55 having a locking disk 54. The formwork 51 is sandwiched between the P-con 53 and the locking disk 54 of the connector 55 to fix the formwork 51. A form tie 56 is connected to the male thread of the connector 55, a washer 57 and a nut 58 are attached to the form tie 56, and a single pipe 59 and a crosspiece 60 are sandwiched between the formwork 51 to prevent deformation of the formwork 51 (see FIG. 14(c)). In addition, a construction method has also been proposed in which the connector 55 is omitted and the form tie 56 is directly connected to the P-con 53. Concrete is poured into the space within the formwork 51 and allowed to harden, after which the form ties 56, connectors 55 and P-con 53 are removed, and the formwork 51 is removed. This completes the construction of the concrete wall.

[0004] Conventional concrete wall construction methods often involve the processes shown in Figures 14(a), (b), (c) and Figures 15(d), (e), (f). When assembling the formwork 51, first, as shown in FIG. 14(a), the concrete formwork 51 is sandwiched, and the connector 55 is connected to the P-con 53 with the form tie socket S1, and the form tie 56 is fastened to it. 、 It is a member that functions as a stopper attached to both ends of the separator 52. The P-con 53 is used for the finishing part, and can be removed and reused after the concrete hardens. The form tie 56 is a metal fitting that fixes the formwork panel 51 with the single pipe 59 and the crosspiece 60. A set of P-con 53, connector 55 and separator 52 is hand-assembled on the opposite side of the formwork 51 and then attached and fastened to the formwork 51 as shown in Fig. 14(b). This is also fastened using socket S1. This separator 52 is a rod made of iron or the like that determines the thickness of the concrete wall, and its length can be changed depending on the construction. As shown in Figure 14(c), Formwork 51 with crosspiece 60 Hit the single pipe 59, Single Tube 59 A washer 57 is placed on the form tie 56, and the nut 58 of the form tie 56 is tightened. The formwork 51 is fixed with a single pipe 59 and a crosspiece 60.

[0005] Next, the formwork 51 on the opposite side is fixed as shown in Fig. 15(d). As in Figs. 14(a) and (c), the form tie 56 is clamped between the connector 55 and the form tie socket S3, and then tightened to the P-con 53. As shown in FIG. 15(e), the formwork 51 is fixed with a single pipe 59 and a crosspiece 60, and the nut 58 of the form tie 56 is tightened with a long socket S2. Finally, as shown in FIG. 15(f), concrete is poured inside both formworks 51 to form concrete walls and foundations.

[0006] A form tie 71 of a type that omits the P-con 53 and is directly connected to the separator 52 has also been proposed. For example, Patent Document 1, JP 2005-155280 A, "Form tie loosening prevention device," discloses a form tie comprising a shaft body that is screwed at one end of the shaft to the end of a separator that constitutes a concrete pouring formwork, a clamping body that has a center portion with a through hole of the shaft body, the shaft body is passed through the through hole and assembled so as to be movable in the axial direction of the shaft body, and has a butter pipe pressing portion on each side of the center portion, and a nut body that is screwed to a male thread formed on the shaft body and tightens the clamping body from the other axial end side of the shaft body. The proposed form tie loosening prevention device has a head and a pair of elastic legs, the head having a through hole formed therein that has a hole shape following the outer shape of the nut body and is large enough to accommodate the nut body, a gap is formed between the inner surfaces of the pair of elastic legs that can accommodate the central part of the clamping body, and the pair of elastic legs each have an engagement claw formed thereon that resiliently engages with the edge portion facing the axial end of the shaft body at the central part of the clamping body when the nut body is inserted into the through hole.

[0007] 16, form tie 71 of Patent Document 1 has a female threaded portion 72 into which the male threaded portion of separator 52 screws, and a locking disk portion 73 that abuts against formwork 51 is formed in the opening of this female threaded portion 72, and continuous with this is a shaft body 74, and continuous with this shaft body 74 are male threaded portion 75 for tightening a washer and a nut, which are formed continuously in the longitudinal direction. The tip of male threaded portion 75 is formed with a rotation engagement portion 76 that tightens form tie 71 to separator 52 with a form tie socket and is inserted when removing.

[0008] FIG. 17 is an explanatory diagram showing a process for constructing a concrete wall using form ties 71 that are directly connected to separators 52. As shown in Figs. 17(a) and (b), the form tie 71 is inserted through the formwork 51. holeThe male threaded portion 52a of the form tie 71 is protruded from the form tie 71. The female threaded portion 72 of the form tie 71 is screwed into this protruding male threaded portion 52a. In the same manner, the form tie 71 is attached to the formwork 51 on the opposite side.

[0009] Next, as shown in FIG. 17(c), ready mixed concrete is poured between both forms 51. Once hardened, the form ties 71 are removed from the separators 52, and the forms 51 are also removed, completing the work (FIG. 17(c)). 7 (d)). In the illustrated example, the crosspieces 60, single pipes 59, washers 57 and nuts 58 for fixing the formwork 51 are omitted.

[0010] Various techniques have been proposed for fixing the formwork when pouring concrete. For example, in Patent Document 2, Japanese Patent No. 6960549 "P-concrete substitute structure for formwork," a P-concrete substitute structure is proposed in which a separator buried in concrete and a male threaded rod penetrating the formwork are connected with a cylindrical nut, a flange ring with a flat flange on the back surface and a tapered elastic material with a larger diameter on the formwork side than on the separator side is inserted between the outer periphery of the male threaded rod and the curing concrete. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] JP 2005-155280 A [Patent Document 2] Patent No. 6960549 Summary of the Invention [Problem to be solved by the invention]

[0012] However, in a construction method in which a form tie 71 is directly connected to a separator 52, as disclosed in Patent Document 1 "Form tie loosening prevention device," the male thread portion 52a of the separator 52 remains protruding significantly from the wall surface in the hardened concrete after the formwork is removed as shown in Figure 17(d), which causes the problem that subsequent processing is complicated.

[0013] The inventor of this invention focused on adding the function of P-con to the form tie. The male thread of the separator does not protrude too far from the concrete surface after hardening, making post-processing smooth. In addition, it was thought that the installation work of the formwork before pouring the concrete could be completed quickly.

[0014] The present invention has been devised to solve such problems. That is, the object of the present invention is to provide a method for constructing a concrete wall using form ties that can stably fix a form by integrating a member for locking the form into the form tie and can be reused any number of times. [Means for solving the problem]

[0015] The present invention Used in the construction of concrete walls The form tie is a form tie (1) that uses a separator (52) to hold a pair of forms (51) that form a space for pouring concrete at a predetermined distance, a rod-shaped shaft body (2) having at one end a locking disk portion (3) for fixing the form (51) by being fitted into a through hole opened in the form (51) for pouring concrete; a male thread portion (5) formed on the other longitudinal end of the shaft body (2) for fastening a washer (57) and a nut (58); and a separator connecting portion (4) having a female thread portion (7) formed continuously with the locking disc portion (3) side of the shaft body (2) and into which the male thread portion of a separator (52) screws.

[0016] The locking disk portion (3) may be configured to be separable from the shaft body (2). It is desirable to attach a cylindrical body (401) that can be inserted and removed to the outer periphery of the separator connecting portion (4).

[0017] The female thread portion (7) formed in the separator connecting portion (4) is threaded to a length (L1) that does not reach from the opening end of the separator connecting portion (4) to the position where the locking disc portion (3) is formed. The female thread portion (7) formed in the separator connecting portion (4) is threaded over a length (L2) from the opening end of the separator connecting portion (4) to beyond the position where the locking disc portion (3) is formed.

[0018] The separator connecting portion (4) has a cylindrical or truncated cone shape.

[0019] The method for constructing a concrete wall using form ties of the present invention comprises a pair of formwork (51) Without using a P-con Separators (52) and form ties (1) Using A method for constructing a concrete wall using form ties that are fixed at predetermined intervals to form a concrete pouring space, comprising the steps of: Form tie (1) teeth , For formwork for pouring concrete(51) Direct hit A rod-shaped shaft body (2) having a locking disk portion (3) at one end for fixing; a male thread portion (5) formed on the other longitudinal end of the shaft body (2) for fastening a washer (57) and a nut (58); A locking disc portion (3) is formed on the shaft body (2) so as to be continuous with the locking disc portion (3). Pass it through the through hole opened in the formwork (51), Male thread of separator (52) (52a) directly and a separator connecting portion (4) having a female thread portion (7) that screws into the separator connecting portion (4). It is , The first one In the through hole of the formwork (51), The first Insert the separator connection part (4) of the form tie (1) and lock the disk part (3) of the form tie (1) but, Applicable The first one Outside the formwork (51) directly Current Attached like a barrel and The male thread portion on one side of the separator (52) (52a) To, The first form tie (1) a step of screwing the female thread portion (7) of the separator connecting portion (4); Similarly , the second one Through holes in the formwork (51) , 2nd Insert the separator connector (4) of the form tie (1) and a step of attaching the form tie (1) so that the locking disk portion (3) directly contacts the outside of the second formwork (51); The male thread portion on the other side of the separator (52) (52a) To, The second Separator connection (4) of form tie (1) of a step of screwing the female thread portion (7); The locking disk portions (3) of the form ties (1) screwed into the male threaded portions (52a) of one separator (52) are disposed on the outsides of the pair of formworks (51), each A crosspiece (60) is placed on the formwork (51), a single pipe (59) is placed on the crosspiece (60), a washer (57) is placed on the single pipe (59), the male threaded portion (5) of the form tie (1) is passed through the washer (57), and the male threaded portion (5) is Tighten the nut (58) A pair and a step of fixing the formwork (51).

[0020] In addition, the method for constructing a concrete wall using the form tie of the present invention comprises a pair of formwork (51) Without using a P-con Separators (52) and form ties (1) Using A method for constructing a concrete wall using form ties that are fixed at predetermined intervals to form a concrete pouring space, comprising the steps of: Form tie (1) teeth , A hole in the formwork (51) for pouring concrete Through the hole , the formwork (51) Directly to A rod-shaped shaft body (2) having a locking disk portion (3) at one end for fixing; a male thread portion (5) formed on the other longitudinal end of the shaft body (2) for fastening a washer (57) and a nut (58); The male thread of the separator (52) is formed continuously with the locking disk portion (3) of the shaft body (2). directly and a separator connecting portion (4) having a female thread portion (7) that is screwed into the separator connecting portion (4). It is , The first one In the through hole of the formwork (51), The first Insert the male threaded portion (5) of the form tie (1) into the locking disc portion (3) of the form tie (1). but Applicable The first one Inside the formwork (51) directly Current Attached like a barrel and The male thread portion on one side of the separator (52) (52a) To, The first form tie (1) a step of screwing the female thread portion (7) of the separator connecting portion (4); Similarly, Insert the second form tie (1) into the through hole of the second formwork (51). Male threaded part (5) a step of inserting the form tie (1) into the second formwork (51) so that the retaining disk portion (3) of the form tie (1) directly contacts the inside of the second formwork (51); The male thread portion on the other side of the separator (52) (52a) To, The second a step of screwing the female thread portion (7) of the separator connecting portion (4) of the form tie (1); The locking disk portions (3) of the form ties (1), each of which is screwed into the male threaded portions (52a) of one separator (52), are disposed inside the pair of formworks (51), each A crosspiece (60) is placed on the formwork (51), and the crosspiece (60) is Single pipe(59) Hit , applicable Single pipe(59) Place the washer (57) on the The male thread portion (5) of the form tie (1) is passed through the washer (57) and then Tighten the nut (58) A pair and a step of fixing the formwork (51). Effect of the Invention

[0021] In the method for constructing a concrete wall using the form tie (1) of the present invention, To Since the P-concrete 53 is not used, one step in the assembly process of the formwork (51) is eliminated, and the work time can be shortened. In addition, the weight and size of the holder for the formwork (51) can be reduced. Moreover, because the separator connection part (4) is added to the conventional form tie shape, and this replaces the P-con 53, the male thread part (52a) of the separator (52) does not remain protruding significantly from the wall surface after the concrete hardens. Since there is no need for adjustment work, the construction work time of the concrete wall can be shortened. The form tie (1) can be passed through the through holes in the formwork (51) from either the outside or the inside.

[0022] The length of the male thread of the separator (52) that protrudes from the wall surface after the concrete has hardened can be freely changed by adjusting the length of the female thread (7) drilled in the separator connecting part (4). Of course, it is also possible to configure it so that it does not protrude from the concrete wall surface. [Brief description of the drawings]

[0023] [Figure 1] 1A, 1B, and 1C are a front view, a left side view, and a right side view, respectively, of a form tie of the present invention. [Diagram 2] FIG. 1 is an explanatory diagram showing a method of constructing a concrete wall using the form tie of the present invention, in which (a) is the state before the form tie is connected to the separator, (b) is the state after the separator connecting part of the form tie is connected to the separator, and (c) is a cross-sectional view of the state in which two formwork pieces are configured. [Diagram 3] FIG. 1 is an explanatory diagram showing a method for constructing a concrete wall using the form tie of the present invention, in which (d) is a cross-sectional view of the state in which a single pipe and a batten are attached to a formwork, (e) is a cross-sectional view of the state in which concrete has been poured into the completed formwork, and (f) is a cross-sectional view of the state in which the form tie and formwork have been completely removed from the concrete wall. [Figure 4] FIG. 1 shows modified form tie 1, where (a) is a front view of the state in which a separate locking disc portion is attached to the shaft body, and the locking disc portion is shown in cross section, (b) is a side view of the locking disc portion only, and (c) is a front view of the state in which the separate locking disc portion is attached to the shaft body. [Diagram 5] 1 shows modified form tie 2, where (a) is a front view of the state in which a separate locking disc portion is attached to the shaft body, the locking disc portion being shown in cross section, (b) is a side view of the locking disc portion only, and (c) is a front view of the state in which the separate locking disc portion is attached to the shaft body. [Figure 6] FIG. 3 shows modified example 3 of the form tie, where (a) is a front view of a cylindrical body attached to the separator connecting portion, and (b) is a cross-sectional view of the concrete with the form tie and formwork removed from the concrete wall. [Figure 7] 4 shows a fourth modified example of the separator connecting portion, in which (a) shows a state in which the cylindrical body is attached to the stepped portion of the separator connecting portion, and (b) shows a state in which the cylindrical body is attached to the stepped portion of the separator connecting portion. [Figure 8] FIG. 11 shows a fifth modified example of a separator connection portion, in which (a) is a front view of a form tie, and (b) is a cross-sectional view of concrete with the form tie and formwork removed from a concrete wall. [Figure 9] FIG. 13 shows a sixth modified example of a separator connection portion, in which (a) is a front view of a form tie, and (b) is a cross-sectional view of concrete with the form tie and formwork removed from a concrete wall. [Figure 10] 13A and 13B are cross-sectional views showing the length of the female thread portion opened in the separator connecting portion, in which (a) is a state in which the female thread portion is short (variant 7), and (b) is a state in which the female thread portion is longer than (a) (variant 8). [Figure 11] FIG. 11 is an explanatory diagram showing another method of constructing a concrete wall using the form tie of the present invention, in which (a) is the state before the form tie is connected to the separator, (b) is the state after the separator connecting part of the form tie is connected to the separator, and (c) is a cross-sectional view of the state in which two formwork pieces are formed. [Figure 12] FIG. 11 is an explanatory diagram showing a method of constructing a concrete wall using another method of form ties, where (d) is a cross-sectional view of the state in which single pipes and battens are attached to the formwork, (e) is a cross-sectional view of the state in which concrete has been poured into the completed formwork, and (f) is a cross-sectional view of the state in which the form ties and formwork have been completely removed from the concrete wall. [Figure 13] This is an explanatory diagram showing how a form tie is fastened to a conventional separator using a P-con and a connector. [Figure 14] 13(a), (b), and (c) are explanatory diagrams showing the process of fastening form ties to a conventional separator using P-con and connectors to fix the formwork. [Figure 15] (d), (e), and (f) are explanatory diagrams showing the work process of fastening the form ties to the conventional separator using P-con and connectors to fix the formwork. [Figure 16] FIG. 1 is a front view showing a conventional form tie that is directly fastened to a separator. [Figure 17] 13(a), (b), (d) and (c) are explanatory diagrams showing the process of fastening a form tie to fix a formwork using a conventional form tie that is fastened directly to a separator. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] The present invention relates to a pair of formwork Without using a P-con Separators and form ties Using Fix at a specified interval to form a space for pouring concrete How to build a concrete wall It is. EXAMPLES

[0025] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. <Configuration of the form tie of the present invention> FIG. 1 shows a form tie of the present invention, where (a) is a front view, (b) is a left side view, and (c) is a right side view. The form tie 1 of the present invention is a form holder having a rod-shaped shaft body 2 made of, for example, metal, a locking disk portion 3 for fixing a form 51 to one longitudinal end of the shaft body 2, a separator connecting portion 4 formed continuous with the locking disk portion 3, and a male thread portion 5 formed on the other end of the shaft body 2. The form tie 1 is used when a pair of formwork 51 that forms a space for pouring concrete is held at a predetermined distance by using a separator 52. Note that the form tie 1 is not limited to being made of metal, and can also be made of plastic as long as it is a material with strong strength.

[0026] <Configuration of shaft body and male thread> The shaft body 2 is a rod-shaped member, and has a flange-shaped locking disk portion 3 at one end in the longitudinal direction. The locking disk portion 3 is fitted to a through hole opened in a formwork 51 for pouring concrete. hole It is a member having the function of abutting against formwork 51 and fixing it in place. In the illustrated example, locking disc 3 is shown as being integrally formed with shaft body 2, but locking disc 3 may be of a type that fits onto shaft body 2 when it is in use. Also, in the illustrated example, locking disc 3 is circular, but it is of course not limited to a circular shape as long as it has a function of preventing it from coming loose.

[0027] The male thread portion 5 is a portion where the washer 57 and nut 58 are fastened. The positions of the washer 57 and nut 58 vary greatly depending on the thickness of the single pipe 59 and crosspiece 60 fixed with the washer 57, and further the number of single pipes 59 to be fixed. That is, they may be attached at a position away from the locking disk portion 3. Therefore, the length of the male thread portion 5 is several times longer than the length of the shaft body 2.

[0028] 1(a) and (c), a rotation engagement portion 6 is formed at the tip of the male thread portion 5, which is used to fasten the form tie 1 to the separator 52 with a form tie socket and is inserted when removing the form tie. In the illustrated example, the cross-sectional shape is hexagonal, but is not limited to this hexagon and can be square or polygonal.

[0029] <Separator connection configuration> The separator connecting portion 4 is a member formed continuously with the locking disk portion 3 side of the shaft body 2. This separator connecting portion 4 is literally a male thread portion of the separator 52. 52a When the separator connecting portion 4 is fastened to the separator 52 or detached from the separator 52, a form tie socket is inserted into the rotation engagement portion 6.

[0030] The separator connecting portion 4 has a cylindrical shape so that it can be easily removed after the concrete has hardened.

[0031] It is preferable that the female thread 7 drilled inside the separator connecting portion 4 is not drilled beyond the position of the locking disk portion 3 (toward the shaft body 2). This is to prevent the male thread 52a of the separator 52 from protruding too far from the hardened concrete wall surface.

[0032] <How to build a concrete wall> Fig. 2 is an explanatory diagram showing a method for constructing a concrete wall using the form tie of Example 1, where (a) is the state before the form tie is connected to the separator, (b) is the state after the separator connection part of the form tie is connected to the separator, and (c) is a cross-sectional view of the state in which two formwork sheets are formed. Fig. 3 is an explanatory diagram showing a method for constructing a concrete wall using the form tie of Example 1, where (d) is a cross-sectional view of the state in which a single pipe and a batten are attached to the formwork, (e) is a cross-sectional view of the state in which concrete has been poured into the completed formwork, and (f) is a cross-sectional view of the state in which the form tie and formwork have been completely removed from the concrete wall. A method for constructing a concrete wall using the form tie of Example 1 will be described. When assembling a form 51, as shown in Figs. 2(a) and (b), the separator connecting portion 4 of the form tie 1 is passed through a through hole of the concrete form 51, and the male thread portion of the separator 52 is inserted into the form tie socket. 52a The separator connecting portion 4 is screwed into the form tie 1 to fasten the form tie 1. Similarly, as shown in Fig. 2(c), another form tie 1 is fastened to the formwork 51 on the opposite side. The method shown in the figure is a fastening method in which the locking disc portion 3 of the form tie 1 is positioned on the “outside” of the through hole of the formwork 51.

[0033] As shown in FIG. 3(d), a crosspiece 60 is attached to the formwork 51. and set it to 60. Put the single pipe 59 on, put the washer 57 on the single pipe 59, and put the form tie 1 Male thread part 5 Tighten nut 58. Add The single pipe 59 and the crosspiece 60 are fixed to the formwork 51. Similarly, the opposite formwork 51 teeth Secure with another form tie 1. As shown in FIG. 3(e), raw By pouring concrete, concrete walls and foundations are created. Figure 3(f) shows the hardened concrete, with formwork 51 and single pipe 59. 、 The cross-sectional view shows a state in which the crosspiece 60 and the form tie 1 have been removed. As shown in the figure, the male thread portion 52a of the separator 52 does not protrude from the wall surface of the hardened concrete.

[0034] Since the form tie 1 of the present invention does not use the conventional P-con 53, one step is eliminated from the assembly process of the form 51, and the work time can be shortened. In addition, the weight and size of the holder for the form 51 can be reduced. The form tie 1 of the present invention has a shape in which the separator connecting portion 4 has been added to the shape of a conventional form tie, and therefore functions in place of the P-concrete 53. In this way, the male thread portion 52a of the separator 52 does not remain protruding significantly from the wall surface after the concrete hardens, and therefore there is no need to perform any adjustment work. 。 The construction work time for concrete walls can be shortened.

[0035] <Form tie variant 1 and variant 2 (with separate locking disk portion)> Fig. 4 shows modified form tie 1, (a) is a front view of a separate locking disc being attached to the shaft body, the locking disc is shown in cross section, (b) is a side view of the locking disc only, and (c) is a front view of the separate locking disc attached to the shaft body. Fig. 5 shows modified form tie 2, (a) is a front view of a separate locking disc being attached to the shaft body, the locking disc is shown in cross section, (b) is a side view of the locking disc only, and (c) is a front view of the separate locking disc attached to the shaft body. In the first modified form tie, the locking disc portion 301 is configured to be detachable from the shaft body 2. The form tie 1 shown in FIG. 1 shows the locking disc portion 301 molded integrally with the shaft body 2. However, this locking disc portion 3 (301) is not necessarily limited to being molded integrally with the shaft body 2. As in the first modified form tie, the locking disc portion 3 (301) may be configured to be retrofitted to the shaft body 2. For example, it may be necessary to increase the outer diameter of the locking disc portion 301 depending on the inner diameter of the through hole of the form 51. In such a case, a locking disc portion 3 with a short diameter cannot function to prevent it from coming off. Therefore, the locking disc 301 is configured to be easily replaced.

[0036] For example, as shown in FIG. 4, a screw thread 302 is provided in a hole drilled in the center of a locking disk portion 301, and a screw thread 201 that screws onto this screw thread 302 is also provided on the shaft body 2. 5, a configuration may be used in which a part of locking disc portion 303 is provided with a notch 304 that can be inserted into groove portion 202 formed around shaft body 2. Locking disc portion 303 is configured to be approximately U-shaped. In addition to this configuration, various other mounting structures are possible.

[0037] <Form tie variants 3 and 4 (attaching a cylinder to the separator connection part)> Figure 6 shows modified example 3 of the form tie, where (a) is a front view of a cylindrical body attached to the separator connection part, and (b) is a cross-sectional view of the concrete with the form tie and formwork removed from the concrete wall. The form tie 1 of the third modification has a cylindrical body 401 attached to the outer periphery of the separator connecting part 4, which can be inserted and removed. This cylindrical body 401 is a rubber tube or a hard or soft plastic tube with an inner diameter the same as the outer periphery of the separator connecting part 4. The cylindrical body 401 may have an inner diameter that provides sufficient adhesion or be made of a material that has adhesive strength so that it will not come off the separator connecting part 4 during construction or transportation.

[0038] When the form tie 1 is to be removed after the concrete has hardened within the formwork 51, the cylindrical body 401 separates from the separator connecting portion 4, allowing the form tie 1 to be easily removed from the concrete wall surface. The cylindrical body 401 remains within the concrete, but provides a water-stopping effect as is. When the cylindrical body 401 protrudes significantly from the concrete wall surface, it is removed or cut.

[0039] FIG. 7 shows a fourth modified example of the separator connecting portion, where (a) shows the state in which the cylindrical body is attached to the stepped portion of the separator connecting portion, and (b) shows the state in which the cylindrical body is attached to the stepped portion of the separator connecting portion. Also, the cylinder 401 can be attached to a part of the separator connecting part 4, and the part of the separator connecting part 4 can be made shorter in diameter so as not to create a step, i.e., it can be attached to a stepped part 402 formed partially thin. As shown in the figure, it can be attached only to the space between the separator 52 and the formwork 51, rather than the length of the separator connecting part 4, so that it remains in the concrete. If it is this length, then no post-processing process is required after the concrete hardens.

[0040] <Modifications 5 and 6 of Separator Connection Part> Fig. 8 shows modified example 1 of the separator connection part, (a) is a front view of the form tie, (b) is a cross-sectional view of the concrete with the form tie and formwork removed from the concrete wall. Fig. 9 shows modified example 6 of the separator connection part, (a) is a front view of the form tie, (b) is a cross-sectional view of the concrete with the form tie and formwork removed from the concrete wall. The shape of the separator connecting part 4 is not limited to a cylindrical shape. As shown in Fig. 8, it may be formed into a truncated cone shape as long as it can be easily removed after the concrete has hardened. Furthermore, as shown in Fig. 8, the shape of the separator connecting part 4 is not limited to a cylindrical shape or a truncated cone shape as long as it can be removed from the hardened concrete, such as a semi-spindle shape, within the range in which the locking disc part 3 has a function of preventing it from coming off from the through-hole of the formwork 51.

[0041] <Modifications 7 and 8 of Separator Connection Part> FIG. 10 is a cross-sectional view showing the length of the female thread portion opened in the separator connecting portion, where (a) is a state in which the female thread portion is short (variant 3), and (b) is a state in which the female thread portion is longer than (a) (variant 4). In the modified example 7 of the separator connecting part 4 shown in Fig. 10(a), the opened female thread part 7 is threaded with a length (L1) that does not reach from the open end of the separator connecting part 4 to the position where the locking disk part 3 is formed. This makes it possible to construct a concrete wall so that the male thread part 52a of the separator 52 does not protrude from the hardened concrete wall surface.

[0042] In a modified example 8 of the separator connecting part 4 shown in Fig. 10(b), the female thread part 7 is threaded with a length (L2) from the open end of the separator connecting part 4 to the position beyond the position where the locking disk part 3 is formed. This allows the construction of a concrete wall so that the male thread part 52a of the separator 52 protrudes from the wall surface of hardened concrete, as necessary. EXAMPLES

[0043] <Other methods of constructing concrete walls> Fig. 11 is an explanatory diagram showing another method of constructing a concrete wall using the form tie of the present invention, in which (a) shows the state before the form tie is connected to the separator, (b) shows the state after the separator connection part of the form tie is connected to the separator, and (c) is a cross-sectional view of the state in which two formwork sheets are formed. Other methods 1A and 1B are explanatory diagrams showing a method for constructing a concrete wall using form ties, in which (d) is a cross-sectional view of a single pipe and battens attached to a formwork, (e) is a cross-sectional view of concrete poured into the completed formwork, and (f) is a cross-sectional view of the concrete wall with the form ties and formwork completely removed. Another method for constructing a concrete wall using the form tie of the present invention will now be described. The method for constructing a concrete wall shown in Figures 2 and 3 is a fastening method in which the locking disk portion 3 of the form tie 1 is positioned on the "outside" of the through hole of the formwork 51. Even in this case, the male thread portion of the separator 52 does not protrude from the hardened concrete wall surface, but it is possible to position the male thread portion of the separator 52 further back into the concrete wall surface. this In Figures 11 and 12 The method shown in the figure is a fastening method in which the locking disk portion 3 of the form tie 1 is placed "inside" the through hole of the formwork 51. When assembling the formwork 51, as shown in FIG. 11(b), the male thread portion 5 of the form tie 1 is passed through the through hole of the concrete formwork 51, and the locking disk portion 3 is placed inside the through hole of the formwork 51. Then, the male thread portion of the separator 52 is fastened with the form tie socket. 52aThe separator connecting portion 4 is screwed into the form tie 1 to fasten the form tie 1. Similarly, as shown in Fig. 11(c), another form tie 1 is fastened to the formwork 51 on the opposite side.

[0044] As shown in FIG. 12(d), a crosspiece 60 is attached to the formwork 51. and set it to 60. Put the single pipe 59 on, put the washer 57 on the single pipe 59, and put the form tie 1 Male thread part 5 Tighten nut 58. Add The single pipe 59 and the crosspiece 60 are fixed to the formwork 51. Similarly, the formwork 51 on the opposite side is fixed with another form tie 1. As shown in FIG. 12(e), concrete is poured into the inside of both formworks 51 to form concrete walls and foundations. FIG. 12(f) shows the hardened concrete, with the formwork 51 and the single pipe 59. 、 The cross-sectional view shows a state in which the crosspiece 60 and the form tie 1 have been removed. As shown in the figure, the male thread portion 52a of the separator 52 does not protrude from the wall surface of the hardened concrete.

[0045] Furthermore, the present invention is not limited to the above-described embodiment of the invention, and of course can be modified in various ways without departing from the gist of the present invention, so long as the form tie 1 is integrated with a member that engages the formwork 51, so that the formwork 52 can be stably fixed and can be reused any number of times. [Industrial Applicability]

[0046] The method of constructing a concrete wall using the form tie of the present invention is not limited to use for concrete, but can be used for various formwork retainers as long as they are used as formwork. [Explanation of symbols]

[0047] 1 Form Tie 2-axis body 3 Locking disc 4 Separator connection part 401 Cylindrical body 5 Form-tied Male thread 7 Form-tied Female thread 51 Formwork 52 Separator 52a Separator male thread 57 Washer 58 Nut

Claims

1. A method for constructing a concrete wall using form ties, which fixes a pair of formworks (51) at a predetermined interval using separators (52) and form ties (1) without using P-concrete, to form a concrete pouring space, comprising: The form tie (1) is A rod-shaped shaft body (2) having a locking disk portion (3) at one end that is directly abutted against and fixed to a formwork (51) for pouring concrete; a male thread portion (5) formed on the other longitudinal end of the shaft body (2) for fastening a washer (57) and a nut (58); a separator connecting portion (4) having a female thread portion (7) which passes through a through hole formed in the form (51) and which is formed continuously with the locking disk portion (3) side of the shaft body (2) and which directly screws into a male thread portion (52a) of a separator (52); a step of inserting the separator connecting portion (4) of the first form tie (1) into the through hole of the first form frame (51) and attaching the form tie (1) so that the locking disc portion (3) of the form tie (1) directly contacts the outside of the first form frame (51); a step of screwing a female thread portion (7) of a separator connecting portion (4) of a first form tie (1) into a male thread portion (52a) on one side of the separator (52); Similarly, a step of inserting the separator connecting portion (4) of the second form tie (1) into the through hole of the second formwork (51) and attaching the form tie (1) so that the locking disc portion (3) of the form tie (1) directly contacts the outside of the second formwork (51); a step of screwing the female thread portion (7) of the separator connecting portion (4) of a second form tie (1) into the male thread portion (52a) on the other side of the separator (52); The locking disk portions (3) of the form ties (1) screwed into the two male threaded portions (52a) of one separator (52) are disposed on the outsides of the pair of formworks (51), and a step of fitting a crosspiece (60) to each formwork (51), fitting a single pipe (59) to the crosspiece (60), fitting a washer (57) to the single pipe (59), passing the male threaded portion (5) of the form tie (1) through the washer (57), and tightening a nut (58) to the male threaded portion (5) to fix the pair of formworks (51).

2. A method for constructing a concrete wall using form ties, which fixes a pair of formworks (51) at a predetermined interval using separators (52) and form ties (1) without using P-concrete, to form a concrete pouring space, comprising: The form tie (1) is a rod-shaped shaft body (2) having at one end a locking disk portion (3) which is inserted into a through hole in a concrete pouring formwork (51) and fixed directly against the formwork (51); a male thread portion (5) formed on the other longitudinal end of the shaft body (2) for fastening a washer (57) and a nut (58); a separator connecting portion (4) having a female thread portion (7) formed continuously with the locking disk portion (3) of the shaft body (2) and directly screwed into the male thread portion of a separator (52); a step of inserting the male thread portion (5) of the first form tie (1) into the through hole of the first formwork (51) and attaching the form tie (1) so that the locking disc portion (3) of the form tie (1) directly contacts the inside of the first formwork (51); a step of screwing a female thread portion (7) of a separator connecting portion (4) of a first form tie (1) into a male thread portion (52a) on one side of the separator (52); Similarly, a step of inserting the male thread portion (5) of the second form tie (1) into the through hole of the second formwork (51) and attaching the form tie (1) so that the locking disc portion (3) of the form tie (1) directly contacts the inside of the second formwork (51); a step of screwing the female thread portion (7) of the separator connecting portion (4) of a second form tie (1) into the male thread portion (52a) on the other side of the separator (52); The locking disk portions (3) of each form tie (1), which are screwed into both male threaded portions (52a) of one separator (52), are disposed inside a pair of formworks (51), and a step of fitting a crosspiece (60) to each formwork (51), fitting a single pipe (59) to the crosspiece (60), fitting a washer (57) to the single pipe (59), passing the male threaded portion (5) of the form tie (1) through the washer (57), and tightening a nut (58) to the male threaded portion (5) to fix the pair of formworks (51).

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