Connection structure between concrete mold and timbering member

Abstract

To provide a support structure holding a concrete mold 1 with a mold clamp 8 attached on an upper end of an oblique timbering member 9, ensuring that the operation of a wadge plate 17 of the mold clamp 8 is carried out easily and securely.SOLUTION: A mold clamp 8 of the present invention is provided with: a receiving member 16 oriented vertically, with its lower end rotatably supported to swing freely on an upper end of a timbering member 9; a clamping member 17 clamping two horizontal battens 4b between the receiving member and itself; and a wedge plate 18, wherein a bar-like body 19 penetrating the receiving member 16 through the space between two horizontal battens 4b is consecutively arranged on the clamping member 17, and the clamping member 17 is allowed to be switched between an action posture orthogonal to the horizontal battens 4b and a put-in / out posture parallel to the horizontal battens 4b around the bar-like body as the rotational center axis to clamp and fix the two horizontal battens 4b between the clamping member 17 in the action posture and the receiving member 16 by inserting the wedge plate 18 into a wedge hole 21 of the bar-like body 19 downward outside the receiving member 16.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a connecting structure between a concrete formwork and a support member, which can be utilized as a means of connecting the upper end of a support member whose lower end is fixed to the road surface side to the horizontal batten of a concrete formwork, in order to hold the concrete formwork, whose upper end is free and not connected to other structures, in a predetermined posture, such as a concrete formwork used to build a parapet wall on the side of an elevated road. [Background technology]

[0002] For example, on the side of the road surface of an elevated road, a concrete wall called a parapet is constructed, which rises from the road surface. The formwork for constructing this concrete wall is constructed by inner and outer formworks that are connected to each other by separators to form a concrete pouring space. Since the upper end of this formwork is free and not connected to other structures, in order to hold the concrete formwork in a predetermined position, for example, a support member is interposed diagonally between a horizontal batten near the upper end of the inner formwork and the road surface. As shown in Patent Document 1, a formwork clamp is attached to the upper end of the support member, which connects the support member to the horizontal batten near the upper end of the concrete formwork. This formwork clamp is equipped with a wedge plate that holds the horizontal batten between a receiving member pivotally supported on the upper end of the support member so as to be freely swingable. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-96166 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional configuration described in the above Patent Document 1, the wedge plate of the form clamp must be driven downward into the wedge hole of the rod-shaped body that is provided so as to protrude from the receiving member to the inside of the horizontal batten. That is, the horizontal batten of the concrete formwork abuts against the outer edge of the side plate attached to the periphery of the formwork plate, so a space is secured between the horizontal batten and the formwork plate on the inside. The wedge plate is driven inside the horizontal batten using this space, and the formwork side plate located above the horizontal batten gets in the way, particularly near the upper edge of the formwork, making it difficult to operate the wedge plate driving hammer. [Means for solving the problem]

[0005] The present invention proposes a connection structure between a concrete form and a support member that can solve the above-mentioned problems of the prior art. The connection structure of the present invention, in which the reference symbols used in the description of the embodiments described later are enclosed in parentheses for ease of understanding of the relationship with the embodiments described later, is a support structure in which a concrete form (1) is supported by an inclined support member (9), and a form clamp (8) is attached to the upper end of the support member (9) so as to be detachably attached to two horizontal battens (4b) arranged in parallel above and below and provided on the form (1). In the connection structure between the concrete form and the support member, the form clamp (8) comprises a vertical receiving member (16) whose lower end is pivotally supported at the upper end of the support member (9) around a horizontal support shaft (15) so as to be swingable, and a clamping member (16) which clamps the two horizontal battens (4b) between the receiving member (16). The clamping member (17) is provided with a rod-shaped main body (19) which passes between the two horizontal flap members (4b) and penetrates the receiving member (16). The clamping member (17) is rotated around the rod-shaped main body (19) in an operating position where the clamping member (17) is perpendicular to the two horizontal flap members (4b) and parallel to the vertical length direction of the receiving member (16), and in an extending / retracting position where the clamping member (17) is parallel to the two horizontal flap members (4b). The rod-shaped main body (19) is configured to be switchable between the receiving position and the clamping member (17), and a wedge hole (21) is provided in the rod-shaped main body (19) for inserting the wedge plate (18) downward on the outside of the receiving member (16). When the clamping member (17) is in the operating position, the wedge plate (18) is inserted downward into the wedge hole (21), thereby clamping and fixing the two horizontal flaps (4b) between the receiving member (16) and the clamping member (17). Effect of the Invention

[0006] According to the above-mentioned configuration of the present invention, the form clamp is positioned outside the flap material to be clamped, and the rod-shaped body protruding from the outside of the receiving member is rotated to switch the clamping member to an in-and-out position parallel to the flap material to be clamped, and in this state, the form clamp is moved to the side where the flap material to be clamped is located, and the clamping member in the in-and-out position passes between the two upper and lower flap materials to enter the rear side of the flap material to be clamped. Next, the rod-shaped body is rotated 90 degrees to switch the clamping member from the in-and-out position to the working position, and the two upper and lower flap materials are clamped between the receiving member on the outside of the flap material and the clamping member on the inside of the flap material. After this, the wedge plate is pressed downwardly into the wedge hole of the rod-shaped body on the outside of the receiving member, so that the clamping member moves outward via the rod-shaped body and the receiving member moves inward relative to each other, and the two upper and lower flap materials can be clamped and fixed between them. Once the form clamps have been connected to the two horizontal flaps at the desired height of the concrete form in this way, the lower end of the support member connected to the lower end of the outer receiving member (or connected at this point) can be fixed to a specified position on the floor surface, and the support member can be interposed between the floor surface and the concrete form at a specified angle, thereby fixing the concrete form in a specified position. Of course, with the lower end of the support member locked in a specified position on the floor surface, it is also possible to connect the form clamp at the upper end to the two horizontal flaps at the desired height of the concrete form as described above.

[0007] The connection structure between the concrete formwork and the support member of the present invention can be used as described above to connect the upper end of the support member to a horizontal batten at the desired height of the concrete formwork, but compared to the conventional known structure such as that described in Patent Document 1, the wedge plate is driven into the wedge hole of the rod-shaped body that protrudes outward from the receiving member that holds the batten from the outside, and is a location that protrudes completely outside the concrete formwork, and there is nothing to limit the working space for driving the wedge plate from above. Therefore, the wedge plate can be driven in easily and reliably.

[0008] Specifically, when implementing the present invention, the penetrating direction of the wedge hole (21) provided in the rod-shaped body (19) can be inclined obliquely with respect to the vertical length direction of the clamping member (17) when in the working position, as viewed from the tip side of the rod-shaped body (19), and the tip of the wedge plate (18) driven obliquely downward into the wedge hole (21) can be positioned laterally shifted from the position directly above the connection part between the lower end of the receiving member (16) and the support member (9). With this configuration, it is no longer necessary to make the length of the receiving member long so that the connection part between the lower end of the receiving member and the support member does not interfere with the tip (lower end) of the wedge plate, as in the case where the wedge plate is driven directly downward from above, and the form clamp can be configured to be small and lightweight.

[0009] The rod-shaped body (19) is configured to have a rectangular cross section with both sides where the wedge hole (21) opens being wider, and the through hole (23) through which the rod-shaped body (19) is provided in the receiving member (16) can be shaped with protrusions (23a, 23b) on both sides in the diameter direction so that the clamping member (17) can rotate only within a 90-degree range between the working position and the insertion / removal position. With this configuration, the clamping member can rotate only within a 90-degree range between the working position in the up-down direction and the insertion / removal position in the horizontal direction with respect to the receiving member whose length direction is up-down when in use. Therefore, the operation of switching the clamping member between the working position in the up-down direction and the insertion / removal position in the horizontal direction can be easily and reliably performed compared to a case where the clamping member can rotate freely without any restrictions. Therefore, the form clamp can be easily and quickly connected to the batten material to be attached on the concrete formwork side, and the operation can be performed efficiently.

[0010] When the above configuration is adopted, the clamping member (17) is formed from a thick plate material, the rod-shaped main body (19) is formed from a round bar material (20) which is welded to the clamping member (17), and the region of this round bar material (20) from the round bar-shaped base (20a) welded to the clamping member (17) to the tip is formed into a rectangular cross-section with wide sides on both sides where the wedge hole (21) opens, and a separate member, for example a pin-shaped member (22) of a length protruding outward on both sides from the outer circumferential surface position of the round bar-shaped base can be attached to the end of the main body region (20b) of this rectangular cross-section on the side of the round bar-shaped base (20a) to prevent the round bar-shaped end portion (20a) from entering the through hole (23) through which the rod-shaped main body (19) passes which is provided in the receiving member (16). According to this configuration, even when the form clamp is not in use and the inner clamping member is closest to the outer receiving member, the rectangular cross-sectional area of ​​the rod-shaped body is located within the rod-shaped body through-hole of the receiving member, and even if the length of the rectangular cross-sectional area is not made long so that the rotation range is limited to within 90 degrees, the narrowed round rod-shaped end between the rectangular cross-sectional area and the inner clamping member does not enter the through-hole and is not interfered with by the protrusion provided in the through-hole, and the rod-shaped body does not rotate freely together with the clamping member. Therefore, the length of the rectangular cross-sectional area of ​​the rod-shaped body can be minimized to reduce costs. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a side view showing an example of a balustrade formwork structure to which the present invention is applied. [Diagram 2] FIG. 2A is a front view of the formwork clamp of the present invention in use, and FIG. 2B is an enlarged view of a portion X in FIG. 2A. [Diagram 3] FIG. 3 is a side view of the same in use. [Figure 4] FIG. 4 is a side view of a clamping member having a rod-shaped body of the formwork clamp of the present invention. [Diagram 5] 5 is an enlarged vertical sectional front view of a main part of the clamping member shown in FIG. [Figure 6]FIG. 6A is a vertical sectional side view of a receiving member used in the formwork clamp, and FIG. 6B is a rear view of the receiving member. [Figure 7] FIG. 7A is a front view showing a first stage of use of the formwork clamp, and FIG. 7B is an enlarged view of a portion Y in FIG. 7A. [Figure 8] FIG. 8 is a side view showing the second stage. [Figure 9] FIG. 9 is a side view showing the third stage. [Figure 10] FIG. 10A is a side view of a form clamp according to another embodiment of the present invention when use is completed, and FIG. 10B is a front view of the main part of FIG. 10A. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] A preferred embodiment of the present invention will be described below with reference to the attached drawings. In Fig. 1, 1 is a concrete formwork for constructing a parapet wall on the side of a road, and is composed of an outer formwork 2 and an inner formwork 3. This concrete formwork 1 is a conventionally known one, and the outer formwork 2 and the inner formwork 3 are composed of formwork plates 2a, 3a, side frames 2b, 3b attached to the outer periphery of the formwork plates 2a, 3a, two horizontal flaps 4a, 4b abutting the outer sides of the side frames 2b, 3b, a separator 5 for keeping the distance between the formwork plates 2a, 3a constant, and flaps clamps 6a, 6b connected to both ends of the separator 5 to fix and integrate the two horizontal flaps 4a, 4b to the formwork 2, 3, etc. In the concrete formwork 1 shown in the figure, round steel pipes are used for the two horizontal flaps 4a, 4b, but square steel pipes may also be used. Of course, the two horizontal battens 4a, 4b, separator 5, and batten clamps 6a, 6b are provided as a means 7 for connecting the two formworks on both sides, and are arranged in multiple vertical stages according to the height of the concrete formwork 1.

[0013] 1, the form clamp 8 according to the present invention is connected to the two upper and lower horizontal flaps 4b on the inner form 3 side of the both-side form-connecting means 7 located at the topmost stage, and the lower end of a support member 9, the upper end of which supports the form clamp 8, is connected by a horizontal support shaft 11 to a support member 10 fixed on the road surface at an appropriate distance from the inner form 3, and the support member 9 is inclined at a predetermined angle so as to move away from the inner form 3 as it approaches the lower end, thereby preventing the inner form 3 from tilting inward and outward, and ultimately holding the entire concrete form 1 in a predetermined attitude. Of course, the form clamps 8 and the support members 9 are arranged at appropriate intervals along the horizontal length of the concrete form 1. The support member 9 also comprises a double tube body 12 which can be expanded and contracted so that its overall length can be adjusted in multiple stages using a connecting pin 12a, a screw shaft portion 13 which is screwed into the screw hole at the tip of the upper tube body 12b of the double tube body 12 and can be freely extended and retracted by rotating forward and backward, and a U-shaped connecting fitting 14 which is open on the top and is connected to the upper end of the screw shaft portion 13. The formwork clamp 8 is connected to the upper end of the support member 9 via this U-shaped connecting fitting 14 so that it can swing freely around a horizontal support shaft 15 which is parallel to the longitudinal direction of the horizontal flank material 4b.

[0014] The detailed structure of the formwork clamp 8 according to the present invention will be described below. As shown in Figures 2 and 3, the formwork clamp 8 comprises an upward-facing receiving member 16 whose lower end is supported by a U-shaped connecting bracket 14 at the upper end of the support member 9 so as to be able to swing freely around a horizontal support shaft 15, a clamping member 17 which clamps the two horizontal flaps 4b between the receiving member 16 and itself inside the receiving member 16, and a wedge plate 18. The receiving member 16 and the clamping member 17 have flaps fitting recesses 16a, 17a on their facing sides into which the upper and lower horizontal flaps 4b fit, and a rod-shaped main body 19 is connected to the clamping member 17 between the two upper and lower flaps fitting recesses 17a.

[0015] As shown in Figures 4 and 5, this rod-shaped main body 19 is composed of a thick plate-shaped rod portion 17b that is connected integrally to the clamping member 17 that is cut out from a thick plate, and a round bar material 20 having a round bar-shaped base portion 20a welded to the tip of this thick plate-shaped rod portion 17b.The main body region 20b of the round bar material 20 from the round bar-shaped base 20a to the tip is press-formed into a flat bar shape of a rectangular cross section with a wedge hole 21 that penetrates in the thickness direction. 2, when the clamping member 17 is viewed from the tip side of the rod-shaped body 19 and the clamping member 17 is in a vertical orientation, the long side of the rectangular cross section of the main body region 20b (the width direction of the wide side surface where the wedge hole 21 opens) is inclined at an angle of 45 degrees, so that the phases of the two are shifted by 45 degrees when the round bar material 20 (round bar base portion 20a) is butt-welded to the thick plate-shaped rod portion 17b of the clamping member 17. A pin-shaped member 22 longer than the diameter of the round bar base portion 20a is fixed by welding to one side of the end portion of the main body region 20b provided with the wedge hole 21 on the round bar base portion 20a side, with both ends protruding from both sides of the wide side surface of the main body region 20b.

[0016] As shown in Fig. 6, the receiving member 16 is formed by pressing a plate material into a U-shaped cross section, with a through hole 23 through which the rod-shaped body 19 passes in its bottom plate portion 16b, and two upper and lower flap fitting recesses 16a are formed on the side edges of left and right side plate portions 16c that are bent and connected from both sides of the bottom plate portion 16b on the side where the clamping member 17 is located. Bearing portions 16d that extend downward beyond the bottom plate portion 16b are formed on the left and right side plate portions 16c, and as shown in Fig. 2, these two bearing portions 16d are axially connected to the U-shaped connecting fitting 14 by the horizontal support shaft 15 in a state in which they fit inside the U-shaped connecting fitting 14 attached to the upper end of the support member 9. Furthermore, the U-shaped connecting fitting 14 is attached to the upper cylindrical shaft portion 13a of the threaded shaft portion 13 of the support member 9 so as to be freely rotatable around the upper cylindrical shaft portion 13a, and a handle bar 24 for rotating the threaded shaft portion 13 is freely attached to a diameter-direction through hole provided in the upper cylindrical shaft portion 13a on the lower side of this U-shaped connecting fitting 14.

[0017] As shown in Figures 2, 6B and 7, the through hole 23 through which the rod-shaped main body 19 passes, which is provided in the bottom plate portion 16b of the receiving member 16, is not a circular hole with a diameter larger than the width of the flat bar-shaped main body region 20b of the rod-shaped main body 19, but has a structure in which protrusions 23a, 23b protruding inward toward the center of the through hole 23 are provided on both diametrical sides of a circular hole with a diameter larger than the width of the main body region 20b. As explained above, the clamping member 17 and the rod-shaped main body 19 are configured so that when the clamping member 17 is in a vertical orientation, the direction in which the wedge plate is driven into the wedge hole 21 in the main body region 20b is tilted 45 degrees to one side or the left or right. At this time, as shown in Figure 2, the side edge portion located on the upper side of the main body region 20b, which is tilted 45 degrees, abuts against the upper side of the protrusion 23b on one side, and the side edge portion located on the lower side of the main body region 20b abuts against the lower side of the protrusion 23a on the opposite side. As a result, the wedge plate 18, which is inserted downward into the wedge hole 21 in the main body region 20b, is restrained in a state inclined 45 degrees to one side from the vertical orientation.

[0018] The wedge plate 18 is connected to a tip portion 18a which tapers more rapidly than the end portion where the width of the area where the wedge action actually takes place (area where the width gradually increases) is at its minimum, and a retaining pin 25 is attached to the tip of this tip portion 18a to prevent the wedge plate 18 from slipping out of the wedge hole 21 of the rod-shaped main body 19. As a result, there is no risk of the clamping member 17 falling out of the receiving member 16 together with the rod-shaped main body 19, and by the retaining pin 25 pulling the wedge plate 18 out to a position adjacent to the wedge hole 21, the width of the wedge plate 18 located within the wedge hole 21 is greatly reduced, and the range of movement of the rod-shaped main body 19 and the clamping member 17 in pulling out of the receiving member 16 is greatly expanded.

[0019] An example of a method of using the form clamp 8 configured as above will be described. As shown in FIG. 1, among the horizontal flaps 4b forming the inner form 3 of the concrete form 1, the form clamp 8 is moved to the outside of the two horizontal flaps 4b at the top and bottom at the portion where the form clamp 8 is connected. At this time, the receiving member 16 of the form clamp 8 may be attached to the upper end of the support member 9, or the support member 9 and the receiving member 16 may be connected after the form clamp 8 is connected to the horizontal flaps 4b. As shown in FIG. 7 and FIG. 8, the clamping member 17 of the form clamp 8 is rotated 90 degrees in the rotatable direction together with the rod-shaped main body 19 from the upright working position to the insertion / removal position. At this time, as shown in the figure, the wedge plate 18 rotates by gravity so that the wide end side close to the center of gravity moves diagonally downward, but there is no risk of the wedge plate 18 falling off the wedge hole 21 of the rod-shaped main body 19 due to the fall-out prevention pin 25. Of course, the clamping member 17, which has been switched to the horizontal insertion / removal position, is maintained in that insertion / removal position by gravity acting on the wedge plate 18 and by the protrusions 23a, 23b of the through hole 23 preventing the rod-shaped body 19 from rotating further on its axis.

[0020] Next, the clamping member 17, which is in a horizontal insertion / removal position as shown in Fig. 8, is inserted horizontally from the outside between the two upper and lower horizontal flap members 4b to be clamped, and the wedge plate 18, which has its wide side end hanging down in this state, is rotated so as to be raised upward, and the clamping member 17 is rotated 90 degrees upward together with the rod-shaped main body 19 to the operating position, or the clamping member 17 is directly rotated 90 degrees upward to the operating position, so that the clamping member 17 clamps the two upper and lower horizontal flap members 4b between the upright vertical receiving member 16 as shown in Fig. 9. In this state, the wedge plate 18, which is in a diagonally downward position, is struck by striking the wide side end at the upper end into the wedge hole 21 of the rod-shaped main body 19, forcing the receiving member 16 and the clamping member 17 toward each other, and the two upper and lower horizontal flap members 4b can be firmly clamped and fixed between the two members 16, 17. As a result, the form clamp 8 is clamped and fixed to the two horizontal flaps 4b above and below the object to be clamped, in the state shown in Figures 2 and 3. The support member 9 having the form clamp 8 at its upper end is connected at its lower end to a support member 10 on the road surface via a horizontal support shaft 11, and the overall length of the support member 9 is adjusted by rotating the screw shaft portion 13 so that the inner form 3 is finally in a predetermined upright position, and the work is completed.

[0021] In the form clamp 8 of the above configuration, when the wedge plate 18 is driven in to clamp and fasten the two upper and lower horizontal flaps 4b between the receiving member 16 and the clamping member 17 in the operating position, the wedge plate 18 is pressed against the receiving member 16 while being inclined at an angle of 45 degrees to the receiving member 16, as shown in Figure 2. As a result, the narrowed tip of the wedge plate 18 moves laterally away from the means connecting the lower end of the receiving member 16 and the upper end of the support member 9, i.e., the connecting means consisting of the U-shaped connecting fitting 14 and the horizontal support shaft 15, so that the two do not interfere with each other. However, as shown in Fig. 10, if the length of the receiving member 16 can be extended downward and the position of the connecting means with the support member 9 can be lowered, there is no need to provide a phase difference of 45 degrees between the flat bar-shaped main body region 20b of the rod-shaped main body 19 in which the wedge hole 21 is provided and the clamping member 17, and it is also possible to configure so that the wedge plate 18 can be driven directly downward in parallel to the longitudinal direction of the receiving member 16. In this case, too, it is preferable to adopt the protrusions 23a, 23b employed in the above embodiment in the through hole 23 through which the rod-shaped main body 19 passes, provided in the receiving member 16, so that the clamping member 17 and the rod-shaped main body 19 can rotate forward and backward only within a range of 90 degrees. [Industrial Applicability]

[0022] The connection structure between a concrete formwork and a support member of the present invention can be utilized as a means of connecting the upper end of a support member, the lower end of which is fixed in position on the road surface side, to the horizontal batten of a concrete formwork, in order to hold the concrete formwork, whose upper end is free and not connected to other structures, in a predetermined posture, such as a concrete formwork used to build a parapet wall on the side of an elevated road. [Explanation of symbols]

[0023] 1 Concrete formwork 2 External formwork 2a,3a Formwork board 2b,3b side frame 3 Inner formwork 4a, 4b Two horizontal flap pieces, top and bottom 5. Separator 6a, 6b Flat material clamp 7 Connection means between formwork on both sides 8 Formwork clamps 9 Supporting members 10 Support member 11 Horizontal support shaft 12 Flexible double tube body 12a Connecting pin 12b Upper tube body 13 Spiral part 13a Upper cylindrical shaft 14 U-shaped connecting fitting 15 Horizontal support shaft 16 Supporting member 16a, 17a Flap material fitting recess 16b Bottom plate part 16c Left and right side panels 16d Bearing part 17 Clamping member 17b Thick plate rod 18 Wedge plate 19 Rod-shaped body 20 Round bar material 20a Round bar base 20b Flat bar-shaped body area 21 Wedge hole 22 Pin-shaped member 23 Through hole 23a,23b Protrusion 24 Handle bar for rotating the screw shaft 25 Locking pin

Claims

1. A concrete formwork is supported by an inclined support member, and a formwork clamp is attached to the upper end of the support member, which is detachably attached to two horizontal battens arranged in parallel above and below the formwork. In the connection structure between the concrete formwork and the support member, The formwork clamp comprises an upward-facing receiving member whose lower end is supported on the upper end of a support member so as to be freely swingable around a horizontal support shaft, a clamping member which clamps the two horizontal battens between the receiving member and the clamping member, and a wedge plate, the clamping member is connected to a rod-shaped main body which passes through the receiving member between the two horizontal battens, and the clamping member is configured to be switchable around the rod-shaped main body as the central axis of rotation between an operating position in which the clamping member is perpendicular to the two horizontal battens and parallel to the upward-downward length direction of the receiving member, and an insertion / retraction position in which the clamping member is parallel to the two horizontal battens, the rod-shaped main body being provided with a wedge hole through which the wedge plate is inserted downwardly on the outside of the receiving member, and when the clamping member is in the operating position, the two horizontal battens are clamped and fixed between the receiving member and the clamping member by inserting the wedge plate downward into the wedge hole.

2. 2. A connection structure between a concrete formwork and a support member as described in claim 1, wherein the penetrating direction of the wedge hole provided in the rod-shaped body is inclined obliquely with respect to the vertical length direction of the receiving member when in the working position, when viewed from the tip side of the rod-shaped body, and the tip of the wedge plate driven downward into the wedge hole is positioned laterally shifted from directly above the connection portion between the lower end of the clamping member and the support member.

3. 3. A connection structure between a concrete formwork and a support member as described in claim 1 or 2, wherein the rod-shaped body has a rectangular cross-section with wide sides on both sides where the wedge holes open, and the through hole through which the rod-shaped body passes and is provided in the receiving member is shaped with protrusions on both sides in the diameter direction so that the clamping member can rotate only within a 90 degree range between the working position and the insertion / removal position.

4. 4. A connection structure between a concrete formwork and a support member as described in claim 3, wherein the clamping member is formed from thick plate material, the rod-shaped main body is formed from round bar material, and the area of ​​the rod-shaped main body from the round bar base welded to the clamping member to the tip is formed into a rectangular cross-section with wide sides on both sides where the wedge holes open, and a member is attached to the end of the rectangular cross-section main body area on the round bar base side to prevent the round bar base from entering the through hole through which the rod-shaped main body passes.

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