Connecting device of concrete formwork and timbering member

Abstract

To provide a connecting device that allows easy and reliable operation of a wedge plate as means for connecting an upper end of a timbering member to two upper and lower horizontal battens of a concrete formwork when the concrete formwork 1 is supported by a diagonal timbering member 11.SOLUTION: A connecting device 16 includes: a vertically oriented upper and lower receiving member 21 that is connected to an upper end of the timbering member 11; a T-shaped pressing member 19 that sandwiches two upper and lower horizontal battens 6a and 6b between itself and the receiving member; a rod-shaped body 18 that is integrated with the T-shaped pressing member 19 and passes through a through hole 22 in the receiving member 21; and a wedge plate 23. A stopper member 27 that can slide only between a one-end cylindrical portion 18b connected to a thick bar-shaped portion 18a and a bottom plate portion 21c of the receiving member 21 is fitted playfully to the thick bar-shaped portion 18a equipped with a wedge hole 17a of the rod-shaped body 18.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a connecting device between a concrete formwork and a support member, which can be used as a means for connecting the upper end of a support member whose lower end is fixed in position, for example, on the road surface side, to the horizontal sway bar of the concrete formwork, in order to hold the concrete formwork, whose upper end is free and not connected to other existing structures, in a predetermined posture, such as a concrete formwork when building a guardrail on the side of an elevated road.

Background Art

[0002] For example, on the side of the road surface of an elevated road, a concrete wall called a guardrail that stands up from the road surface is constructed. The formwork for constructing this concrete wall is constructed by inner and outer formworks that form a concrete pouring space. The inner and outer formworks are connected to each other by a separator that maintains the interval between the two formworks. The outer formwork can be extended downward from the road surface of the road structure and fixed to the outer surface of the road structure to be held in a vertical posture. However, the inner formwork only has its lower end placed on the road surface of the road structure, and its upper end is free and not connected to other existing structures. Therefore, in order to hold the inner concrete formwork in a predetermined posture, for example, as shown in Patent Document 1, an inclined support member is interposed between the horizontal sway bar near the upper end of the inner formwork and the road surface of the road structure.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The conventional connecting device between a concrete formwork and a shoring member described in Patent Document 1 pivotally supports a receiving member that abuts against the outer sides of two upper and lower horizontal braces near the upper end of the inner formwork at the upper end of the shoring member, and inserts a rod-shaped body protruding inward from the receiving member inward between the two upper and lower horizontal braces. A wedge plate must be driven downward into a vertical wedge hole provided in this rod-shaped body between the horizontal brace and the formwork plate inside it. That is, since the horizontal brace of the concrete formwork abuts against the outer side of the peripheral side plate attached around the formwork plate, a space is secured between the horizontal brace and the formwork plate inside. The wedge plate driving operation is performed inside the horizontal brace using this space. Especially in a place near the upper side of the formwork, the formwork peripheral side plate located above the horizontal brace gets in the way and the operation of the wedge plate driving hammer cannot be easily performed.

Means for Solving the Problems

[0005] The present invention proposes a connecting device between a concrete formwork and a shoring member that can solve the above-mentioned conventional problems. The connecting device according to the present invention is shown with reference numerals used in the description of the following embodiments enclosed in parentheses for easy understanding of the relationship with the embodiments. In a connecting device (16) for connecting the upper end of an inclined shoring member (11) that supports a concrete formwork (3) and two upper and lower horizontal braces (6a, 6b) of the concrete formwork (3), When the connecting device (16) includes a rod-shaped body (18) having a wedge hole (17a), a T-shaped pressing member (19) integrally connected to the inner end of the rod-shaped body (18), a receiving member (21) that sandwiches the upper and lower two horizontal flapping members (6a, 6b) between the upper and lower protruding arm portions (19a, 19b) of the T-shaped pressing member (19), and a wedge plate (23). The receiving member (21) has a cross-sectional groove shape with left and right side plate portions (20a, 20b) and a bottom plate portion (20c) that sandwich the upper and lower two horizontal flapping members (6a, 6b) on the front side. The bottom plate portion (20c) is provided with a through hole (22) through which the rod-shaped body (18) passes. The wedge plate (23) is driven into the wedge hole (17a) of the rod-shaped body (18) that protrudes outside the receiving member (21) through the through hole (22). The lower end of the receiving member (21) when it is in the vertical direction intersecting the upper and lower two horizontal flapping members (6a, 6b) is connected to the upper end of the support member (11). The rod-shaped body (18) is composed of a one-end cylindrical portion (18b) where the tip of the central shaft portion (19c) of the T-shaped pressing member (19) is integrally welded, and a thick plate rod-shaped portion (18a) with a rectangular cross-section from this one-end cylindrical portion (18b) to the other end. The wedge hole (17a) is provided so as to penetrate the thick plate rod-shaped portion (18a) in its thickness direction. On the inner peripheral edge of the through hole (22) provided in the receiving member (21), the upper and lower protruding arm portions (19a, 19b) of the T-shaped pressing member (19) can rotate the thick plate rod-shaped portion (18a) of the rod-shaped body (18) only within a range of 90 degrees between a vertical posture parallel to the length direction of the receiving member (21) and a horizontal posture perpendicular to the length direction of the receiving member (21). The thick plate rod-shaped portion (18a) of the rod-shaped body (18) is configured such that a stopper member (27) is loosely fitted between the one-end cylindrical portion (18b) and the bottom plate portion (20c) of the receiving member (21) to allow only movement in the length direction of the thick plate rod-shaped portion (18a).

Effect of the Invention

[0006] When the connecting device between the concrete formwork and the supporting member of the present invention is in use, a T-shaped pressing member in a horizontal posture is inserted toward the concrete formwork between two upper and lower horizontal braces arranged at an appropriate height on the outer side of the concrete formwork to be held in a posture. The T-shaped pressing member is rotated 90 degrees around its central axis, and both upper and lower protruding arm portions are switched to a vertical posture on the back side of the two upper and lower horizontal braces. The receiving member in a vertical posture externally fitted to the rod-shaped main body integrated with the central axis portion of the T-shaped pressing member is applied to the outer sides of the two upper and lower horizontal braces, and a wedge plate is inserted into the wedge hole of the rod-shaped main body protruding from the receiving member, and the rear end wide portion of this wedge plate is struck with a hammer and pressed in. As a result, both upper and lower protruding arm portions in the vertical posture of the T-shaped pressing member located inside the two upper and lower horizontal braces and the receiving member in the vertical posture located outside the two upper and lower horizontal braces approach and move toward each other, and as a result of sandwiching the two upper and lower horizontal braces from both the inside and the outside, the entire connecting device is fixed to the two upper and lower horizontal braces. By the above operation, since the upper end of the supporting member can be connected to the two upper and lower horizontal braces arranged at an appropriate height on the outer side of the concrete formwork, the lower end of the supporting member in an inclined formwork support posture with respect to the concrete formwork is fixed on the surface of the existing structure by a conventionally well-known method, and the concrete formwork can be held in a predetermined posture. Of course, it is also possible to connect the connecting device at the upper end to the two horizontally oriented braces at an appropriate height of the concrete formwork as described above with the lower end of the supporting member locked at a predetermined position on the surface of the existing structure.

[0007] The connecting device 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 the two horizontal upper and lower battens at an appropriate height of the concrete formwork. However, compared with the conventionally well-known configuration described in Patent Document 1, the driving position of the wedge plate is outside the receiving member that sandwiches the batten from the outside, that is, the wedge hole of the rod-shaped body protruding outside the concrete formwork, that is, the place that completely projects outside the concrete formwork, and there is no place that restricts the working space for driving the wedge plate. Therefore, the wedge plate driving operation can be easily and surely performed. Moreover, according to the configuration of the present invention, the following special effects can be expected.

[0008] That is, the rod-shaped body having the wedge hole can be configured by using a conventionally well-known rod-shaped body with a wedge hole for formwork assembly. As shown in FIG. 6, this conventionally well-known rod-shaped body with a wedge hole for formwork assembly has a cylindrical member with a cylindrical portion 18b of an appropriate length left at one end, and the remaining entire region is pressure-formed into a flat shape to form a thick plate rod-shaped portion 18a. A groove-shaped portion 18c is formed along the length direction on one side (surface) of the thick plate rod-shaped portion 18a, and wedge holes 17a and 17b are provided in the groove-shaped portion 18c. A large-diameter flange portion 18d is provided at the end of the cylindrical portion 18b remaining at one end, and a connecting screw hole 18e is provided concentrically from the end face of the large-diameter flange portion 18d. When this is diverted to the rod-shaped body in the present invention, since the length of the one-end cylindrical portion 18b is long, it is cut to the required minimum length, and the end face of the central shaft portion of the T-shaped pressing member is abutted against the end face of the length-adjusted one-end cylindrical portion 18b and welded, so that the rod-shaped body having the wedge hole and the T-shaped pressing member are integrated, and the main components of the connecting device can be realized simply and inexpensively. On the other hand, the through hole provided in the bottom plate portion of the receiving member, that is, the through hole with a diameter that allows the thick plate rod-shaped portion of the rectangular cross section of the rod-shaped body to rotate, is provided with protrusions at two positions in the diameter direction of the inner peripheral edge of the through hole, and the rotation range of the thick plate rod-shaped portion is limited to 90 degrees, making the operation during use easier. However, it is actually difficult to configure the space between the protrusions on both sides in the diameter direction to be so small that the one-end cylindrical portion of the rod-shaped body cannot pass through. Therefore, as a result, the through hole becomes a through hole into which the one-end cylindrical portion of the rod-shaped body can enter.

[0009] As a result, the receiving member of the connecting device before use moves toward the side where the T-shaped pressing member is located, one end cylindrical portion of the rod-shaped body enters into the through hole, and the rod-shaped body with a wedge hole can rotate freely without any restriction on the rotation angle with respect to the receiving member, and the function of limiting the rotation range of the thick plate rod-shaped portion to 90 degrees is lost. As a result, at the beginning of the next use, after performing a rotation operation so that the rod-shaped body having a wedge hole and the T-shaped pressing member are in a predetermined orientation with respect to the receiving member, the receiving member is pulled out with respect to the rod-shaped body, and one end cylindrical portion of the thick plate rod-shaped portion is made to escape from the through hole of the receiving member and the thick plate rod-shaped portion is returned into the through hole of the receiving member. In other words, unnecessary operations are required when using the connecting device, and a problem occurs that the work cannot be efficiently performed. As one means for avoiding such a problem, it is conceivable to fix a stopper member for preventing the one end cylindrical portion from entering into the through hole of the receiving member by welding or the like at the boundary portion between the thick plate rod-shaped portion and the one end cylindrical portion of the rod-shaped body. However, not only the stopper member but also a welding cost for accurately welding the stopper member at a predetermined position is required, and it does not become a complete problem solution.

[0010] According to the configuration of the present invention described above, a stopper member is loosely fitted in the thick plate rod-shaped portion of the rod-shaped body so as to be movable only in the length direction of the thick plate rod-shaped portion between the one end cylindrical portion and the bottom plate portion of the receiving member. Since the thick plate rod-shaped portion has a rectangular cross section, the stopper member may be provided with a rectangular through hole through which the thick plate rod-shaped portion can pass. The outer diameter of the stopper member may be a size that can be loosely fitted with a margin between the left and right side plate portions of the receiving member, and the thickness may be such that the required strength can be ensured. Therefore, it can be manufactured very simply and inexpensively, and the assembly is completed only by loosely fitting this stopper member in the thick plate rod-shaped portion of the rod-shaped body prior to the receiving member. Therefore, it can be said that there is almost no risk of adversely affecting the manufacture of the connecting device. Moreover, due to the incorporation of the stopper member, there is no risk that the one end cylindrical portion of the rod-shaped body will enter up to the position of the through hole of the receiving member. In the through hole provided for passing the rod-shaped body through the receiving member, the thick plate rod-shaped portion of the rod-shaped body is surely positioned, and the functions of the two protrusions provided at two diametric positions on the inner peripheral edge of the through hole are surely exerted, so that the posture switching of the T-shaped pressing member with respect to the receiving member is restricted within a range of 90 degrees, and the problems described in detail above have been surely solved.

[0011] Specifically, when implementing the present invention described above, the central shaft portion (19c) of the T-shaped pressing member (19) and the rod-shaped body (18) are such that when the upper and lower protruding arm portions (19a, 19b) of the T-shaped pressing member (19) are in the vertical posture direction, the wedge plate (23) inserted into the wedge hole (17a) of the rod-shaped body (18) is inclined obliquely with respect to the length direction of the receiving member (21), and the tip side of the wedge plate (23) protrudes laterally of the receiving member (21), and they can be welded and fixed. According to this configuration, there is no need to increase the length of the receiving member so that the tip portion of the wedge plate does not interfere with the connecting portion between the lower end of the receiving member and the upper end of the support member, as in the case where the wedge body is driven into a vertical posture parallel to the length direction of the receiving member. The receiving member can be configured to have the minimum required length, thereby reducing costs.

[0012] Further, a retaining portion (26) for preventing the pulling out from the wedge hole (17a) is provided at the tip narrow portion (24a) of the wedge plate (23), and the rear end wide portion (25a) of the wedge plate (23) is configured to be wider than the length of the wedge hole (23) so that it cannot pass from the wedge hole (23) to the side where the tip narrow portion (24a) is located. According to this configuration, with respect to the rod-shaped main body integrally provided with the T-shaped pressing member at the tip, the receiving member fitted to the rod-shaped main body and the wedge plate inserted into the wedge hole of the rod-shaped main body outside the receiving member are integrated without separating from each other, so that the handling of the connecting device before use becomes easy.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Best Mode for Carrying Out the Invention

[0014] Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. In FIG. 1, reference numeral 1 denotes a concrete formwork for constructing a guardrail wall on the side of a road, which is composed of an outer formwork 2 and an inner formwork 3. This concrete formwork 1 is well-known in the art. The outer formwork 2 and the inner formwork 3 are composed of formwork plates 2a, 3a and peripheral side frames 2b, 3b attached to the outer peripheral sides of these formwork plates 2a, 3a. The outer formwork 2 and the inner formwork 3 are connected by formwork interconnection means 4 in a plurality of upper and lower stages (two upper and lower stages in the illustrated example), and a concrete placing space with a predetermined width is formed between the outer formwork 2 and the inner formwork 3. The formwork interconnection means 4 for each stage is composed of two upper and lower horizontal braces 5a, 5b and 6a, 6b respectively arranged outside the outer formwork 2 and the inner formwork 3 at the same height and abutting against the outer sides of the peripheral side frames 2b, 3b, a separator 7, and well-known brace clamps 8 for fastening the two upper and lower horizontal braces 5a, 5b and 6a, 6b to both ends of the separator 7.

[0015] In the concrete formwork structure for constructing the guardrail wall shown in Fig. 1, the outer formwork 2 has a height that can be abutted against the side wall surface 9a of the existing road structure 9. The lower end region of the outer formwork 2 that abuts against the side wall surface 9a of the road structure 9 is fixed to the side wall surface 9a of the road structure 9 by an anchor 10 embedded in the road structure 9, two upper and lower horizontal bracing members 5a and 5b arranged outside the lower end region of the outer formwork 2, and a conventionally well-known bracing member clamp 8 that fastens the two upper and lower horizontal bracing members 5a and 5b to the outer end of the anchor 10. On the other hand, since the lower end of the inner formwork 3 is only placed and supported on the road surface 9b of the road structure 9, means for maintaining the standing posture is required. As means for maintaining this standing posture, an inclined support member 11 is installed between near the upper end of the inner formwork 3 and the road surface 9b of the road structure 9. This support member 11 is a conventionally well-known one, and includes a support column body 12 whose overall length can be adjusted in multiple stages, a screw shaft body 13 that is screwed to the upper end of the support column body 12 so as to be freely inserted and removed and adjusted, and an upward U-shaped connecting tool 14 that is attached to the upper end of the screw shaft body 13 and can rotate around the axis of the screw shaft body 13. The lower end of the support column body 12 is pivotally supported by a horizontal pivot 15a on a support base 15 fixed on the road surface 9b of the road structure 9, and the support column body 12 is supported so that the upper end of the support column body 12 can swing in the far and near direction with respect to the inner formwork 3. In Fig. 1, a screw-type bracing member clamp 8 is used, but a wedge-type one is also used. Also, as the illustrated horizontal bracing members 5a to 6b, round steel pipes are used, but square steel pipes may also be used.

[0016] As shown in FIGS. 2 to 5, the connecting device 16 according to the present invention includes a rod-shaped main body 18 having wedge holes 17a and 17b, a T-shaped pressing member 19 connected to the inner end side of the rod-shaped main body 18, and upper and lower horizontal braces 6a and 6b sandwiched between upper and lower protruding arm portions 19a and 19b of the T-shaped pressing member 19. It is composed of a receiving member 21 having left and right side plate portions 20a and 20b with a groove-shaped cross section, and a wedge plate 23. The wedge plate 23 is driven into the wedge hole 17a of the rod-shaped main body 18 that penetrates through a through hole 22 provided in a bottom plate portion 20c connecting the left and right side plate portions 20a and 20b of the receiving member 21 and protrudes to the outside of the receiving member 21. The receiving member 21 includes a pair of left and right connecting plate portions 20d formed by extending the left and right side plate portions 20a and 20b downward at the lower end when the receiving member 21 is in the vertical direction intersecting the upper and lower horizontal braces 6a and 6b. An upward U-shaped connector 14 at the upper end of the support member 11 is externally fitted to the pair of left and right connecting plate portions 20d, and the two are connected by a bolt 14a and a nut 14b that horizontally penetrate them. As shown in FIG. 2, recessed edge portions 19e and 20e into which the upper and lower horizontal braces (round steel pipes) 6a and 6b sandwiched between the inner sides of the upper and lower protruding arm portions 19a and 19b of the T-shaped pressing member 19 and the inner sides of the left and right side plate portions 20a and 20b of the receiving member 21 are fitted are formed.

[0017] As shown in FIG. 8, the wedge plate 23 has a narrow front end portion 24a and a wide rear end portion 25a. The narrow front end portion 24a is provided with a beveled portion 24b formed by obliquely cutting the tip side corner of the inner side 23a that slidably contacts the bottom plate portion 21c of the receiving member 21, and a recessed portion 24c formed at a position slightly away from the tip of the outer side 23b that slidably contacts the outer end of the wedge hole 17a. The wide rear end portion 25a is provided with a steeply inclined rising portion 25b having an increased inclination angle in the region adjacent to the rear end of the outer side 23b that slidably contacts the outer end of the wedge hole 17a. Therefore, the wide rear end portion 25a of the wedge plate 23 is longer than the entire length of the wedge hole 17a and is configured not to be able to pass through to the side where the narrow front end portion 24a is located from the wedge hole 17a. Further, a retaining portion 26 for preventing withdrawal from the wedge hole 17a is provided on the narrow front end portion 24a of the wedge plate 23 on the tip side of the recessed portion 24c. After inserting the narrow front end portion 24a of the wedge plate 23 into the wedge hole 17a, a headed pin 26a is inserted through a mounting hole provided in advance in the narrow front end portion 24a, and the tip portion of the headed pin 26a is caulked and attached.

[0018] As shown in Fig. 7, the rod-shaped body 18 is composed of a one-end cylindrical portion 18b to which the tip of the central shaft portion 19c of the T-shaped pressing member 19 is integrally welded, and a thick plate rod-shaped portion 18a with a rectangular cross-section from this one-end cylindrical portion 18b to the other end. On the surface side of this thick plate rod-shaped portion 18a, a shallow groove-shaped portion 18c is formed at the central position in the lateral width direction, and the wedge holes 17a and 17b are provided so as to penetrate from the surface side to the back side of the thick plate rod-shaped portion 18a in a state of being in series in the length direction of the thick plate rod-shaped portion 18a within the groove-shaped portion 18c. As shown in Fig. 6, the rod-shaped body 18 is configured by diverting a conventionally widely used rod-shaped body with wedge holes for assembling concrete formwork and the like. Specifically, as the connecting device 16 of the present invention, the outer wedge hole 17b is not used but left as it is. And on the one-end cylindrical portion 18b, a large-diameter flange portion 18c is integrally formed on the end face, and mounting screw holes 18d are provided concentrically from the end face of the one-end cylindrical portion 18b. However, as the rod-shaped body 18 in the present invention, since the overall length of the one-end cylindrical portion 18b is too long and the flange portion 18c is unnecessary, the tip portion including the flange portion 18c is cut to adjust the length of the one-end cylindrical portion 18b to the required dimension. Of course, the length of the thick plate rod-shaped portion 18a may be shortened to the length including only the inner wedge hole 17a.

[0019] The T-shaped pressing member 19 is formed by cutting a thick plate material with a plate thickness thinner than that of the thick plate rod-shaped portion 18a into a T shape, and the width of the central axis portion 19c thereof is about the diameter of the one-end cylindrical portion 18b. The front end surface of the central axis portion 19c of the T-shaped pressing member 19 is concentrically butted against the end surface of the one-end cylindrical portion 18b of the rod-shaped body 18 and fixed and integrated with each other by a welding portion 19d. When the front and back flat surfaces of the thick plate rod-shaped portion 18a in the rod-shaped body 18 are horizontally positioned during the welding integration of the rod-shaped body 18 and the T-shaped pressing member 19, the front and back flat surfaces of the T-shaped pressing member 19 are not horizontal but inclined at an angle of 45 degrees obliquely around the central axis of both the rod-shaped body 18 and the T-shaped pressing member 19. As shown in FIG. 4, this inclined direction is such that when the T-shaped pressing member 19 is in the vertical direction, the surface of the thick plate rod-shaped portion 18a of the rod-shaped body 18, that is, the surface with the groove-shaped portion 18c (the surface on the side where the wedge plate is driven into the wedge hole 17a) faces obliquely upward at an angle of 45 degrees.

[0020] In the through-hole 22 provided in the receiving member 21 and through which the rod-shaped main body 18 passes, as shown in FIGS. 4 and 5, when the receiving member 21 is in the vertically upright position, on both sides in the horizontal diameter direction of the inner peripheral edge of the through-hole 22, there project symmetric right-angled triangular protrusions 22a and 22b with their tips facing the center of the through-hole 22. When the T-shaped pressing member 19 is in the vertical position parallel to the length direction of the receiving member 21, the wedge plate 23 driven into the wedge hole 17a of the rod-shaped main body 18 will be inclined obliquely downward at 45 degrees. At this time, as shown in FIG. 5A, among the two protrusions 22a and 22b, the upper inclined surface of one protrusion 22a is in surface contact with the upper half of the back surface of the thick-plate rod-shaped portion 18a of the rod-shaped main body 18, and the lower inclined surface of the other protrusion 22b is in surface contact with the lower half of the front surface of the thick-plate rod-shaped portion 18a, preventing the rod-shaped main body 18 from rotating further counterclockwise. It is possible to rotate the rod-shaped main body 18 clockwise from such a state. However, when the clockwise rotation angle reaches 90 degrees, as shown in FIG. 5B, among the two protrusions 22a and 22b, the lower inclined surface of one protrusion 22a is in surface contact with the lower half of the back surface of the thick-plate rod-shaped portion 18a of the rod-shaped main body 18, and the upper inclined surface of the other protrusion 22b is in surface contact with the upper half of the front surface of the thick-plate rod-shaped portion 18a, preventing the rod-shaped main body 18 from rotating further clockwise. That is, the T-shaped pressing member 19 is in a state where it can rotate forward and backward within a range of 90 degrees between the vertical position shown in FIG. 4 and the horizontal position shown in FIG. 11 with respect to the receiving member 21.

[0021] As shown in Fig. 7, a circular thick plate stopper member 27 provided with a rectangular through hole 27a through which a thick plate rod-shaped portion 18a of a rectangular cross-section can be inserted is loosely fitted to the rod-shaped main body 18 so as to be slidable in the longitudinal direction of the thick plate rod-shaped portion 18a. As shown by the phantom line in Fig. 7 and the solid line in Fig. 9, this stopper member 27 can slide over the entire area from the boundary position between the one end cylindrical portion 18b to the free end of the thick plate rod-shaped portion 18a. After the stopper member 27 is loosely fitted to the thick plate rod-shaped portion 18a of the rod-shaped main body 18, the receiving member 21 is loosely fitted to the thick plate rod-shaped portion 18a from the free end of the rod-shaped main body 18 using the through hole 22. At this time, it must be noted that the through hole 22 of the receiving member 21 and the thick plate rod-shaped portion 18a of the rod-shaped main body 18 are within the 90-degree range of forward and reverse rotation shown in Figs. 5A and 5B. Since the stopper member 27 has a diameter slightly smaller than the distance between the left and right side plate portions 20a and 20b of the receiving member 21, as shown in Figs. 2 and 9, the receiving member 21 slides to the vicinity of the starting end position of the thick plate rod-shaped portion 18a with the stopper member 27 received between the left and right side plate portions 20a and 20b. Finally, as shown by the solid line in Fig. 9, the state where the stopper member 27 is sandwiched between the one end cylindrical portion 18b of the rod-shaped main body 18 and the bottom plate portion 20c of the receiving member 21 becomes the limit position of the slide, and there is no possibility that the one end cylindrical portion 18b of the rod-shaped main body 18 enters the through hole 22 of the receiving member 21.

[0022] FIG. 10 illustrates a state where the stopper member 27 is not used. If the through-hole 22 of the receiving member 21 is sized such that the one-end cylindrical portion 18b can enter, when the receiving member 21 is slid toward the T-shaped pressing member 19 with the tip of the thick-plate rod-shaped portion 18a of the rod-shaped body 18 inserted into the through-hole 22 of the receiving member 21, as shown in FIG. 10, the receiving member 21 can slide to a position where the through-hole 22 enters the one-end cylindrical portion 18b of the rod-shaped body 18. If the welding portion 19d where the rod-shaped body 18 and the central shaft portion 19c of the T-shaped pressing member 19 are welded is also in a situation where the through-hole 22 can be overcome, the receiving member 21 will slide to a position reaching the central shaft portion 19c of the T-shaped pressing member 19. When the through-hole 22 of the receiving member 21 slides to a position reaching the one-end cylindrical portion 18b of the rod-shaped body 18 or the central shaft portion 19c of the T-shaped pressing member 19 in this way, the rod-shaped body 18 (or the central shaft portion 19c of the T-shaped pressing member 19) can freely rotate between the protrusions 22a and 22b on both sides in the diameter direction of the through-hole 22, and the function of restricting the rotation of the receiving member 21 by the protrusions 22a and 22b on both sides in the diameter direction of the through-hole 22 within a 90-degree range is lost, and the problems described above occur. However, in the configuration of the present invention incorporating the stopper member 27, such problems can be solved.

[0023] If the receiving member 21 is fitted into the thick-plate rod-shaped portion 18a of the rod-shaped body 18 until this state, a wedge plate 23 is inserted into the wedge hole 17a of the rod-shaped body 18 protruding outward from the through-hole 22 of the receiving member 21 from the surface side of the thick-plate rod-shaped portion 18a, from the tip narrow-width portion 24a in a state where the headed pin 26a is not attached. After that, the headed pin 26a is inserted into the mounting hole and the tip is caulked to complete the retaining portion 26. The assembly of the connecting device 16 is completed as above.

[0024] An example of the usage method of the connecting device 16 configured as described above will be described. As shown in FIG. 1, the connecting device 16 is attached at a position where it does not interfere with the batten clamps 8 that fasten the upper and lower two horizontal battens 6a and 6b of the upper part of the inner formwork in the concrete formwork 1 to the separator 7. That is, as shown in FIGS. 5B and 11, the T-shaped pressing member 19 is rotated 90 degrees clockwise to the horizontal position with respect to the receiving member 21 in the vertical up-and-down position, and the T-shaped pressing member 19 in this horizontal position is inserted between the upper and lower two horizontal battens 6a and 6b. In this state, the rod-shaped body 18 protruding outward from the receiving member 21 is pushed in, and the upper and lower protruding arm portions 19a and 19b of the T-shaped pressing member 19 are moved from between the upper and lower two horizontal battens 6a and 6b into the space between the upper and lower two horizontal battens 6a and 6b and the formwork plate 3a on the back side thereof. Next, the wedge plate 23 in a state where the tip narrow-width portion 24a is inserted into the wedge hole 17a of the rod-shaped body 18 is grasped, etc., and the rod-shaped body 18 is rotated 90 degrees counterclockwise to return the T-shaped pressing member 19 from the horizontal position to the vertical up-and-down position, and the upper and lower protruding arm portions 19a and 19b are moved to the back side of the upper and lower two horizontal battens 6a and 6b. After that, the wedge plate 23 inclined at 45 degrees obliquely in a state where the tip narrow-width portion 24a is fitted into the wedge hole 17a of the rod-shaped body 18 outside the receiving member 21 is struck with a hammer at its upper end, the rear-end wide-width portion 25a, and driven obliquely downward, so as to act to pull the rod-shaped body 18 outward with respect to the receiving member 21. As a result, as shown in FIGS. 2 to 4, the upper and lower two horizontal battens 6a and 6b are sandwiched between the receiving member 21 and the upper and lower protruding arm portions 19a and 19b of the T-shaped pressing member 19, and the connecting device 16 can be fixed to the upper and lower two horizontal battens 6a and 6b.

[0025] Once the connecting device 16 has been attached to the predetermined positions of the upper and lower two horizontal battens 6a and 6b as described above, connect the upper end of the support member 11 to the lower end of the receiving member 21 of the connecting device 16, or connect the lower end of the support member 11 that was connected to the lower end of the receiving member 21 of the connecting device 16 before attachment, as shown in Fig. 1, to the support base 15 mounted on the road surface 9b of the road structure 9 via the horizontal support shaft 15a. Finally, adjust the overall length of the support member 11 by adjusting the length of the support column 12 and finely adjusting the length by rotating the screw shaft 13 so that the inner formwork 3 assumes a predetermined upright posture, and the work is completed.

[0026] In addition, in the connecting device 16 having the above configuration, as shown in Figs. 2 to 4, when the wedge plate 23 is driven in, the wedge plate 23 is inclined at an angle of 45 degrees obliquely with respect to the receiving member 21, and its tip narrow portion 24a protrudes laterally from the side of the receiving member 21. However, if the means for connecting the lower end of the receiving member 21 and the upper end of the support member 11 (upward U-shaped connectors 14 or bolts and nuts 14a, 14b) do not interfere with the tip narrow portion 24a of the driven wedge plate 23, it is also possible to configure the driven wedge plate 23 to be in a vertically upright posture. Even in this case, it is desirable to incorporate the protrusions 22a and 22b employed in the above embodiment into the through holes 22 through which the rod-shaped main body 19 provided on the receiving member 21 penetrates, and configure the rod-shaped main body 18 and the T-shaped pressing member 19 to be rotatable forward and backward only within a range of 90 degrees with respect to the receiving member 21.

Industrial Applicability

[0027] The connecting device for connecting the concrete formwork and the support member according to the present invention can be utilized as a means for connecting the upper end of the support member whose lower end is fixed in position on the road surface side to the horizontal batten of the concrete formwork in order to hold a concrete formwork, such as the one used when building a guardrail on the side of an elevated road, whose upper end is free and not connected to other structures, in a predetermined posture.

Explanation of Reference Numerals

[0028] 1 Concrete formwork 2 Outer formwork Formwork plates of types 2a and 3a Peripheral formwork of types 2b and 3b 3 Inner formwork 4 Formwork connection means Horizontal bracing members 5a, 5b, 6a, and 6b 7 Separator 8 Bracing clamp 9 Road structure 9a Side wall surface 9b Road surface 10 Anchor 11 Support member 12 Support column body 13 Screw shaft body 14 Upward U-shaped connector 14a Bolt 14b Nut 15 Support base 15a Horizontal support shaft 16 Connecting device 17a, 17b Wedge holes 18 Rod-shaped body 18a Thick plate rod-shaped part 18b One-end cylindrical part 18c Groove-shaped part 19 T-shaped pressing member 19a, 19b Upper and lower protruding arm parts 19c Central shaft part 19d Welded part 19e, 20e Recessed edge part 20a, 20b Left and right side plate parts 20c Bottom plate part 20d A pair of left and right connecting plate parts 21 Receiving member 22 Through hole 22a, 22b Protruding parts 23 Wedge plate 23a Inner side of the wedge plate 23b Outer side of the wedge plate 24a Tip narrow part of the wedge plate 24b Inclined side part 24c Concave part 25a Rear end wide part of the wedge plate 25b Steeply inclined rising part 26 Anti-drop part Pin with head 26a 27 Stopper member 27a Rectangular through-hole

Claims

1. In a connecting device for connecting the upper end of an inclined supporting and bracing member that supports a concrete formwork and two upper and lower horizontal bracing members of the concrete formwork, the connecting device comprises a rod-shaped body having a wedge hole, a T-shaped pressing member integrally connected to the inner end of the rod-shaped body, a receiving member that clamps two upper and lower horizontal bracing members between the upper and lower protruding arm portions of the T-shaped pressing member, and a wedge plate. The receiving member has a cross-sectional groove shape with left and right side plate portions and a bottom plate portion that clamp the two upper and lower horizontal bracing members on the front side. The bottom plate portion has a through hole through which the rod-shaped body penetrates. The wedge plate is driven into the wedge hole of the rod-shaped body that protrudes outside the receiving member through the through hole. The lower end of the receiving member when it is in an upward and downward direction intersecting the two upper and lower horizontal bracing members is connected to the upper end of the supporting and bracing member. The rod-shaped body comprises a one-end cylindrical portion where the tip of the central shaft portion of the T-shaped pressing member is integrally welded, and a thick plate rod-shaped portion with a rectangular cross-section from this one-end cylindrical portion to the other end. The wedge hole is provided so as to penetrate in the thickness direction of the thick plate rod-shaped portion. The through hole provided in the receiving member has protrusions on both sides in the diameter direction that enable the thick plate rod-shaped portion of the rod-shaped body to rotate only within a range of 90 degrees between a vertical posture in which the upper and lower protruding arm portions of the T-shaped pressing member are parallel to the length direction of the receiving member and a horizontal posture perpendicular to the length direction of the receiving member. A stopper member is loosely fitted on the thick plate rod-shaped portion of the rod-shaped body so as to enable only movement in the length direction of the thick plate rod-shaped portion between the one-end cylindrical portion and the bottom plate portion of the receiving member. A connecting device for a concrete formwork and a supporting and bracing member.

2. The central shaft portion of the T-shaped pressing member and the rod-shaped body are welded and fixed such that when the upper and lower protruding arm portions of the T-shaped pressing member are in the vertical posture, the wedge plate inserted into the wedge hole of the rod-shaped body is inclined obliquely with respect to the length direction of the receiving member, and the tip side of the wedge plate protrudes to the lateral side of the receiving member. The connecting device for a concrete formwork and a supporting and bracing member according to Claim 1.

3. The tip narrow-width portion of the wedge plate is provided with a retaining portion that prevents the pulling out from the wedge hole, and the rear-end wide-width portion of the wedge plate is wider than the length of the wedge hole and is configured so as not to be able to pass from the wedge hole to the side where the tip narrow-width portion is located. The connecting device between the concrete formwork and the support member according to claim 1 or 2.

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