Auxiliary equipment for slab formwork construction and method for constructing slab concrete using the same

Abstract

To reduce the number of workers and the labor required for installation of girder materials, and to improve the workability by removing an auxiliary tool for slab formwork construction from the girder materials before concrete is poured.SOLUTION: A temporary hanging portion 13, which temporarily hangs on the upper end of a girder material 23, consists of: a formwork upper end placing portion 13a that is placed on the upper end of a wall formwork 3; a hook portion 13b that extends downward from the tip of the formwork upper end placing portion 13a and is hung onto the upper end of the wall formwork 3 when the girder material 23 is installed; and a connecting portion 13c that extends from the rear end of the formwork upper end placing portion 13a to a girder material receiving portion 11 and is connected with the girder material receiving portion 11, and goes down to a position lower than the formwork upper end placing portion 13a by a length approximately equal to the outer diameter R1 of a joist 22. Between the hook portion 13b and the girder material receiving portion 11, a first space S1 that accommodates at least the top end of the wall formwork 3 and a second space S2 that is a movable area of the girder material receiving portion 11, are be formed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an auxiliary tool for slab formwork construction for installing joists used in slab formwork construction for concrete buildings, and a joist construction method using the same. [Background technology]

[0002] In the construction of slab forms for concrete buildings, for example, the height of the support materials for the joists was adjusted in advance, and one worker was placed on each side of a pair of wall forms, with two more workers lifting the joists to the required position and securing them with the support materials, while the workers on both sides of the wall forms secured the ties to the joists (at their tops).This required three to four workers.

[0003] Therefore, as a publicly known technology to facilitate slab formwork construction work, for example, an auxiliary device for slab formwork construction has been proposed that includes a hanging portion to be placed on the top surface of the wall formwork, a locking claw that is bent downward from the tip of the hanging portion and is located on the inner surface of the side formwork to hang on the structure constructed with the side formwork, a continuous portion that is bent downward from the hanging portion, a joist mounting portion that extends horizontally from this continuous portion, and a joist fixing means provided on the mounting portion (see, for example, Patent Document 1). In the installation work of joists using the slab formwork construction auxiliary equipment described in Patent Document 1, the slab formwork construction auxiliary equipment is installed at the upper end of each side of the wall formwork, and the joists are stretched between the slab formwork construction auxiliary equipment installed at the upper end of the wall formwork on both sides.This makes it easy to install joists using the slab formwork construction auxiliary equipment, making it easier to position and attach joists and floor joists during slab formwork construction, and reduces the number of parts that are damaged when the formwork is dismantled. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 3-95444 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the installation work of joists using the auxiliary equipment for slab formwork construction described in Patent Document 1, when considering the number of people required for the work of installing the joists, it is assumed that first one worker will be positioned on each end of a pair of wall formworks, and the auxiliary equipment for slab formwork construction will be attached to the upper ends of both sides of the wall formwork, and then another two workers (or two workers with auxiliary equipment attached) will lift the joists and place them on the upper ends of both sides of the wall formwork on the mounting section of the auxiliary equipment for slab formwork construction and secure them in place.There is almost no difference in the number of workers required compared to when the auxiliary equipment for slab formwork construction is not used, and there is still room for improvement in terms of simplifying the work.

[0006] Furthermore, on page 8, lines 4 to 15 of Patent Document 1, it is stated that when removing the slab formwork construction auxiliary equipment when dismantling the slab formwork, the hanging claws of the slab formwork construction auxiliary equipment are embedded in the hardened concrete structure, so the slab formwork construction auxiliary equipment can be removed by hitting it with a crowbar or the like. This means that the slab formwork construction auxiliary equipment of Patent Document 1 has the problem of poor workability.

[0007] Therefore, the present invention has been made in consideration of these problems, and aims to provide an auxiliary device for slab formwork construction that can reduce the number of workers and the amount of work required to install joists, and that can be removed from the joists before pouring concrete to improve workability, and a construction method using the same. [Means for solving the problem]

[0008] In order to solve the above problems, the auxiliary equipment for slab formwork construction according to the present invention comprises a beam receiving part that is inserted into and detachably attached to the tip of a beam that supports the sheathing boards that make up the slab formwork via joists, and a temporary hanging part that is provided on the beam receiving part and is temporarily hung on the upper end of the wall formwork, the beam receiving part having a pair of opposing surfaces that are spaced apart by a distance equal to or greater than the thickness of the tip of the beam, and one of the pair of opposing surfaces is provided with a beam fixing screw that threads into a screw hole and presses the tip of a threaded rod against the side of the tip of the beam to detachably fix the tip of the beam to the beam receiving part, and the temporary hanging part The mounting portion has a formwork upper end mounting portion that is placed on the upper end of the wall formwork, a hooking portion that extends downward from the tip of the formwork upper end mounting portion and is hooked onto the upper end of the wall formwork when the joist is being installed, and a connecting portion that extends from the rear end of the formwork upper end mounting portion toward the joist support portion and is connected to the joist support portion, and is lower than the formwork upper end mounting portion by a length approximately equal to the outer diameter of the joist, and the distance between the hooking portion and the joist support portion is greater than the sum of the thickness of the upper end of the wall formwork in the direction from the hooking portion toward the joist support portion and the length of the joist support portion. In addition, in the auxiliary tool for slab formwork construction according to the present invention, the beam receiving portion has left and right side plate portions as the pair of opposing surfaces, and a bottom plate portion connecting the left and right side plate portions, The left and right side plate portions and the bottom plate portion have lower end portions on the wall formwork side that are cut out. The auxiliary tool for slab formwork construction according to the present invention is also characterized in that continuous reinforcing ribs are provided on the upper surfaces of the beam receiving portion and the temporary hanging portion. Furthermore, the method for constructing slab concrete using slab formwork construction auxiliary tools according to the present invention comprises the steps of: fixing any of the above-mentioned slab formwork construction auxiliary tools to the tip of the joists; hooking the hooking parts of the slab formwork construction auxiliary tools fixed to the tip of the joists onto the upper ends of the wall formwork, lifting the joists and placing the formwork upper end mounting parts on the upper ends of the wall formwork; supporting the undersides of the lifted joists with support materials; removing the slab formwork construction auxiliary tools from the joists supported by the support materials; and installing a slab formwork via joists on the joists from which the slab formwork construction auxiliary tools have been removed, and pouring slab concrete into them. [Effects of the Invention]

[0009] Between the hook portion of the auxiliary device for slab formwork construction according to the present invention and the beam receiving portion The distance between the upper end of the wall formwork in the direction from the hook to the joist support is greater than the sum of the thickness of the upper end of the wall formwork in the direction from the hook to the joist support and the length of the joist support. Because of this, it is possible to attach a slab formwork construction auxiliary device to the tip of the joist in advance, hook its hooking part onto the upper end of the wall formwork, and then lift the rear end of the joist using the boundary between the hooking part and the upper end mounting part of the formwork as a fulcrum, thereby reducing the number of workers and effort required to install the joist and improving workability. Also, The distance between the hook and the beam receiving part is greater than the sum of the thickness of the upper end of the wall formwork in the direction from the hook to the beam receiving part and the length of the beam receiving part. This makes it possible to remove the auxiliary equipment for slab formwork construction attached to the tip of the joists from the joists before pouring the slab concrete, thereby improving workability in this respect as well. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a front view showing an embodiment of a slab formwork construction auxiliary device according to the present invention attached to a joist and the joist lifted to its installation position. [Figure 2] 1A and 1B are a front view and a plan view, respectively, of an auxiliary device for slab formwork construction according to an embodiment of the present invention. [Figure 3]1A and 1B are a rear view and a bottom view, respectively, of an auxiliary tool for slab formwork construction according to an embodiment of the present invention. [Figure 4] 1A and 1B are a left side view and a right side view, respectively, of an auxiliary device for slab formwork construction according to an embodiment of the present invention. [Figure 5] 1(a) to 1(c) are diagrams showing the steps of a construction method using an auxiliary tool for slab formwork construction according to an embodiment of the present invention. [Figure 6] (a) to (c) are enlarged front views of the main part showing the state in which the hooking part is hooked onto the upper end of the wall formwork during the hooking process of the construction method using the slab formwork construction auxiliary device of an embodiment of the present invention. [Figure 7] 1(a) to 1(c) are diagrams showing the steps of a construction method using an auxiliary tool for slab formwork construction according to an embodiment of the present invention. [Figure 8] 1(a) to 1(c) are diagrams showing the procedure for removing a slab formwork construction auxiliary device from a state in which joists are supported by support materials at their installation positions using the slab formwork construction auxiliary device according to an embodiment of the present invention. [Figure 9] 1A and 1B are diagrams showing the steps for removing a slab formwork construction auxiliary device from a state in which a joist is supported at its installation position by a support material, using an embodiment of the slab formwork construction auxiliary device according to the present invention. [Figure 10] 1(a) to 1(c) are a plan view, a front view, and a bottom view, respectively, of an auxiliary device for slab formwork construction according to a second embodiment of the present invention. [Figure 11] 1(a) to 1(c) are a rear view, a left side view, and a right side view, respectively, of an auxiliary device for slab formwork construction according to a second embodiment of the present invention. [Figure 12] 1(a) to 1(c) are a plan view, a front view, and a bottom view, respectively, of an auxiliary device for slab formwork construction according to a third embodiment of the present invention. [Figure 13] 10(a) to 10(c) are a rear view, a left side view, and a right side view, respectively, of an auxiliary device for slab formwork construction according to a third embodiment of the present invention. [Figure 14]10(a) to 10(c) are a plan view, a front view, and a bottom view, respectively, of an auxiliary device for slab formwork construction according to a fourth embodiment of the present invention. [Figure 15] 10(a) to 10(c) are a rear view, a left side view, and a right side view, respectively, of an auxiliary device for slab formwork construction according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] The following describes embodiments of auxiliary equipment for slab formwork construction and a construction method using the same according to the present invention. Note that the embodiments described below are merely examples of the present invention, and the present invention is not limited to the following embodiments, and can be modified as appropriate within the scope of the invention's technical concept.

[0012] Embodiment 1. <Slab formwork construction auxiliary device 1 of embodiment 1> The auxiliary device 1 for slab formwork construction according to the first embodiment of the present invention is detachably attached to the tip of a beam 23 that supports, via joists 22, the slab sheathing 21 that constitutes the slab formwork 2, and is configured with a beam support portion 11, a beam fixing screw 12, a temporary hanging portion 13, a reinforcing rib portion 14, etc. The beam support portion 11, the temporary hanging portion 13, and the reinforcing rib portion 14 are made of steel plate and joined by welding, but they may of course be formed as a single unit, or may be made of resin or the like as long as the strength to support the beam 23 can be ensured.

[0013] In FIG. 1, reference numeral 31 denotes a wall sheathing board, 32 denotes a vertical end thick member, 33 denotes a horizontal end thick member, 34 denotes a formwork fastening metal fitting, and 35 denotes a separator.

[0014] (Joist support part 11) 1 and 2, the beam support 11 is detachably attached to the tip of the beam 23 and is configured so that the tip of the beam 23 can be inserted between top plate 11a and bottom plate 11b, and left and right side plate portions 11c, 11c, which are spaced apart at a distance roughly the same as or slightly larger than the thickness of the tip of the beam 23. When the tip of the beam 23 is inserted into the beam support 11, the tip of the beam 23 abuts against the second connecting portion 13d of the temporary hanging portion 13, which joins the beam support 11 and the temporary hanging portion 13. Furthermore, the lower ends of the side plate portions 11c, 11c of the beam support 11, which face the wall formwork 3, that is, the lower left corner when viewed from the front, are diagonally notched.

[0015] The side plate portions 11c, 11c of the beam support portion 11 form a pair of opposing surfaces, and of the left and right side plate portions 11c, 11c, one of the side plate portions 11c has a through hole (not shown) through which the threaded rod portion 12a of the beam fixing screw 12 passes, and is also provided with a nut portion 11d having a female threaded hole into which the threaded rod portion 12a screws.

[0016] Therefore, after inserting the tip of the beam 23 into the beam receiving portion 11, the beam fixing screw 12 that threads into the nut portion 11d can be rotated to fix the tip of the beam 23 with the tip of the screw rod portion 12a, and the beam receiving portion 11 can be removed from the beam 23 by rotating it in the opposite direction.

[0017] (Fixing screw part 12) The fixing screw portion 12 is composed of a threaded rod portion 12a that screws into a female threaded hole in a nut portion 11d provided on one of the pair of side plate portions 11c, 11c of the beam support portion 11, and a handle portion 12b provided at the rear end of the threaded rod portion 12a.By grasping the handle portion 12b and rotating the threaded rod portion 12a that screws into the nut portion 11d, the tip of the threaded rod portion 12a is pressed against the side of the beam 23, and the tip of the beam 23 is removably fixed to the beam support portion 11.

[0018] (Temporary hanging part 13) The temporary hanging portion 13 is formed by cutting a single steel plate into a predetermined shape and then bending the cut steel plate. As shown in FIG. 1, the temporary hanging portion 13 comprises a form upper end placing portion 13a on which the upper end of the wall formwork 3 is placed, a hooking portion 13b which is hooked onto the upper end of the wall formwork 3 as shown in FIG. 6(a) and the like, which will be described later, when installing the joists 23, a first connecting portion 13c which extends obliquely from the rear end of the form upper end placing portion 13a toward the joist receiving portion 11, and a second connecting portion 13c which extends vertically from the first connecting portion 13c and blocks about half of the front of the joist receiving portion 11. 2(a) and 3(a), a first space S1 is formed between the hooking portion 13b and the beam receiving portion 11 on the side of the hooking portion 13b below the formwork upper end mounting portion 13a, in which the upper end of the wall formwork 3 is accommodated, while a second space S2, which is the range of movement of the beam receiving portion 11, is formed on the side of the first connecting portion 13c below the formwork upper end mounting portion 13a and below the first connecting portion 13c.

[0019] The second space S2, which serves as the movable range, is a space for moving the slab formwork construction auxiliary tool 1 up and down, using the boundary between the hanging part 13b of the slab formwork construction auxiliary tool 1 and the formwork upper end mounting part 13a as a fulcrum, and the provision of this space makes it possible to lift the rear end of the joist 23 with the hooking part 13b of the slab formwork construction auxiliary tool 1 attached to the tip of the joist 23 hooked onto the upper end of the wall formwork 3. Furthermore, as shown in Figure 6 (to be described later) and other figures, when the hooking part 13b of the slab formwork construction auxiliary tool 1 attached to the tip of the joist 23 is hooked onto the upper end of the wall formwork 3 and when the formwork upper end mounting part 13a is placed on the upper end of the wall formwork 3, the slab formwork construction auxiliary tool 1 does not interfere with the formwork fixing device 34 (see Figure 1) that secures the wall formwork 3. Furthermore, after the installation of the joists 23 is completed, it also functions as the space necessary to remove the slab formwork construction auxiliary equipment 1 attached to the tip of the joists 23, as shown in Figures 8 and 9 described below.

[0020] For example, the longitudinal length of the joist 23 in the second space S2, which is the range of motion, is made longer than at least the length L4 in the same direction of the joist support part 11 (see Figure 2(a)), so that even when the formwork upper end mounting part 13a of the slab formwork construction auxiliary device 1 is placed on the upper end of the wall formwork 3, the slab formwork construction auxiliary device 1 can be slid in the longitudinal direction of the sliding joist 23 toward the wall formwork 3 and removed from the tip of the joist 23.

[0021] Specifically, the length L1 of the upper end mounting portion 13a of the formwork (see FIG. 2(a)) is equal to or greater than the thickness T1 of the wall sheathing board 31, the thickness T2 of the vertical end thick member 32, and the length L4 of the joists 23 of the left and right side plate portions 11c, 11c of the joist receiving portion 11. In other words, L1≧T1+T2+L4 This makes it possible to secure a large space for removing the slab formwork construction auxiliary device 1, making it easier to remove.

[0022] However, in the slab formwork construction auxiliary device 1 of embodiment 1, the vertical length H2 (see Figure 2(a)) of the left and right side panel portions 11c, 11c is slightly larger than the thickness T3 (see Figure 1) of the beam 23.Therefore, when removing the slab formwork construction auxiliary device 1 from the tip of the beam 23, if the slab formwork construction auxiliary device 1 can be slid from the tip of the beam 23 toward the wall formwork 3 so that the beam support portion 11 can be removed from the tip of the beam 23 by rotating the beam support portion 11 in the direction away from the wall formwork 3 as shown in Figure 9, etc., which will be described later, even if the beam support portion 11 has not been completely removed from the tip of the beam 23, the length L1 (see Figure 2(a)) of the formwork upper end mounting portion 13a does not need to satisfy L1≧T1+T2+L4.

[0023] Furthermore, the sum of the length L1 (see FIG. 2(a)) of the formwork upper end mounting portion 13a and the horizontal length L2 (see FIG. 2(a)) of the first connecting portion 13c is at least equal to or greater than the thickness T1 (see FIG. 1) of the wall sheathing 31, the thickness T2 (see FIG. 1) of the vertical end member 32, the outer diameter R2 (see FIG. 1) of the horizontal end member 33, and the protruding length L3 (see FIG. 1) of the formwork fastening fitting 34 from the horizontal end member 33. In other words, L1+L2≧T1+T2+R2+L3 If this formula is not satisfied, and if the horizontal end thick members 33 or formwork fastening fittings 34 are installed at the upper end of the wall formwork 3, there is a high possibility that the slab formwork construction auxiliary equipment 1 at the tip of the joist 23 will interfere with the horizontal end thick members 33 or formwork fastening fittings 34. Therefore, it is desirable to determine the horizontal lengths L1 and L2 of the formwork upper end mounting part 13a and the first connecting part 13c so as to satisfy this formula.

[0024] 1 and 2(a), the hooking portion 13b is formed to extend obliquely downward at an angle of (90+α) degrees from the tip of the formwork upper end mounting portion 13a. The reason why the angle between the hooking portion 13b and the formwork upper end mounting portion 13a is set to an angle of (90+α) degrees rather than 90 degrees is to make it easier to hook the hooking portion 13b of the slab formwork construction auxiliary device 1 of the embodiment onto the upper end of the wall formwork 3, thereby improving workability, as shown in Figures 6(a) and (b) described below.

[0025] The first connecting portion 13c is a portion that extends diagonally from the rear end of the formwork upper end mounting portion 13a toward the second connecting portion 13d at an angle of (90+β) degrees, and by descending at an angle of (90+β) degrees, the descending length (height difference) H1 (see Figure 2(a)) from the joint with the formwork upper end mounting portion 13a to the joint with the lower end portion 12c2 of the first connecting portion 13c, which is the joist support portion 11, is approximately the same as the outer diameter R1 of the joist 22.

[0026] This is because, even if the hooking portion 13b of the slab formwork construction auxiliary device 1 at the tip of the joist 23 is hooked onto the upper end of the wall formwork 3 as described below, the rear end of the joist 23 is lifted and the underside of the joist 23 is supported by the support material 24, and after the slab formwork construction auxiliary device 1 is removed from the tip of the joist 23, a slab sheathing board 21 is installed on top of the joist 23 via a joist 22, the height of the slab sheathing board 21 will be equal to the height of the upper end of the wall formwork 3, making it possible to remove the slab formwork construction auxiliary device 1 before pouring concrete, thereby improving workability.

[0027] (Reinforcing rib 14) The reinforcing rib 14 is joined to the upper plate portion 11a of the joist support portion 11, the hook portion 13b of the temporary hanging portion 13, the upper surface of the formwork upper end mounting portion 13a and the first connecting portion 13c, thereby reinforcing the strength of the entire slab formwork construction auxiliary device 1.

[0028] <Construction method using auxiliary tool 1 for slab formwork construction according to the embodiment> Next, a construction method using the slab formwork construction auxiliary tool 1 of the embodiment configured as above will be described.

[0029] (From the installation of auxiliary equipment 1 for slab formwork construction to the installation of beams 23) First, as shown in Figure 5(a), the slab formwork construction auxiliary tool 1 is attached and fixed only to the tip end side of the slab formwork construction auxiliary tool 1. Specifically, after inserting the tip end of the slab formwork 23 into the slab formwork support part 11 of the embodiment, the handle part 12b of the fixing screw part 12 is grasped and the threaded rod part 12a is rotated, thereby pressing the tip end of the threaded rod part 12a against the side of the slab formwork 23 and fixing the slab formwork 23 to the slab formwork support part 11.

[0030] After the joists 23 are raised to the height of the upper end of the wall formwork 3, support materials 24 are installed at predetermined positions below the joists 23 to support the joists 23. Nails 25 or the like are driven into the underside of the joists 23 in accordance with the positions of nail holes (not shown) in the support base 24a (see Figure 5(b)) at the upper end of the support materials 24.

[0031] Next, adjust the height of the support material 24 if necessary, and then lean the support material 24 against the wall formwork 3 on the side where the slab formwork construction auxiliary device 1 at the tip of the joist 23 is not hooked, as shown in Figure 5(b), for example, on the right side of Figure 5(b).

[0032] Next, the worker takes the joist 23 with the slab formwork construction auxiliary device 1 attached as shown in Figure 5(a) and hooks the hook portion 13b of the slab formwork construction auxiliary device 1 at the tip onto the upper end of the wall formwork 3 as shown in Figure 6(a).

[0033] Here, when the angle α formed by the formwork upper end mounting portion 13a and the hooking portion 13b is a right angle of 90 degrees, it is necessary to hook the hooking portion 13b onto the upper end of the wall formwork 3 at a position close to halfway, for example, up to approximately 30 mm from the tip of the hooking portion 13b, as shown in Figure 6(b).

[0034] However, in the slab formwork construction auxiliary device 1 of the embodiment, the angle (90 + α) formed between the formwork upper end mounting portion 13a and the hooking portion 13b is, for example, 105 degrees, which is larger than 90 degrees, as shown in Figure 2(a).Therefore, when the hooking portion 13b of the slab formwork construction auxiliary device 1 of the embodiment is hooked onto the upper end of the wall formwork 3 as shown in Figure 6(a), it is only necessary to hook a length of approximately 20 mm from the tip of the hooking portion 13b onto the upper end of the wall formwork 3, thereby improving workability.

[0035] With the hooking portion 13b of the slab formwork construction auxiliary tool 1 at the tip of the joist 23 hooked to the upper end of the wall formwork 3 as shown in Figure 6(a), the worker lifts the rear end of the joist 23 as shown in Figure 7(a) and places the support material 24 leaning against the wall formwork 3 underneath the joist 23 as shown in Figure 7(b). The worker then secures the joist 23 and the first support material 24 with nails or the like near the wall formwork 3 on the side where the slab formwork construction auxiliary tool 1 is not hooked. The worker then installs the support material 24 at the installation positions marked with nails 25 on the joist 23, including near the wall formwork 3 on the side where the slab formwork construction auxiliary tool 1 is hooked. When lifting the rear end of the joist 23, it may be temporarily placed on a tripod 26 or the like and then lifted to the desired position.

[0036] 7(b) from the back side to the front side or vice versa, and then, to prevent misalignment of the multiple joists 23, they are connected in a direction perpendicular to the longitudinal direction of the joists 23 using connecting members 27 or the like. Nails 25 or the like are used to connect the connecting members 27 to the joists 23.

[0037] (Removal of auxiliary equipment 1 for slab formwork construction) After the installation of the joists 23 is completed, the auxiliary equipment 1 for slab formwork construction is removed from the tip of the joists 23, and after the auxiliary equipment 1 for slab formwork construction is removed, the sheathing board 21 is installed via the joists 22 and the concrete for the slab is poured.

[0038] Specifically, as shown in Figure 8(a), the joist fixing screw 12 of the slab formwork construction auxiliary device 1 of the embodiment is loosened until the joist support portion 11 of the slab formwork construction auxiliary device 1 can be removed from the tip of the joist 23.

[0039] Next, as shown in Figure 8(b), slide (move) the slab formwork construction auxiliary device 1 from the tip of the joist 23 toward the wall formwork 3, which is to the left in the figure, and remove the joist support part 11 of the slab formwork construction auxiliary device 1 from the tip of the joist 23.

[0040] Here, if the slab formwork construction auxiliary device 1 is slid (moved) toward the wall formwork 3 and the joist support part 11 does not come completely out of the tip of the joist 23, making it difficult to remove it, the joist support part 11 can be removed from the tip of the joist 23 by lifting the temporary hanging part 13 and rotating the entire slab formwork construction auxiliary device 1 in the direction away from the wall formwork 3, as shown in Figure 8(c).

[0041] In this case, as shown in Figure 9(a), for example, the lower end of the joist support part 11 on the wall formwork 3 side is cut out, so that when the slab formwork construction auxiliary equipment 1 is removed, it is possible to prevent the joist support part 11 from interfering with the formwork fastening fittings 34, the horizontal end thick members 33, etc., thereby improving workability.

[0042] Then, when the beam support portion 11 of the slab formwork construction auxiliary device 1 comes out from the tip of the beam 23, the slab formwork construction auxiliary device 1 is lifted as shown in Figure 9(b), completing the work of removing the beam support portion 11 of the slab formwork construction auxiliary device 1 from the tip of the beam 23.

[0043] Thereafter, slab sheathing 21 is installed via joists 22 on top of the joists 23, which are supported by support members 24 and from which the slab formwork construction auxiliary device 1 has been removed, and then concrete is poured to form a concrete slab. At this time, because the drop length (height difference) H1 (see Figure 2(a)) of the first connecting part 13c of the slab formwork construction auxiliary device 1 is made approximately the same as the outer diameter R1 of the joists 22, the height of the slab sheathing 21 becomes equal to the height of the upper end of the wall formwork 3, and the slab formwork construction auxiliary device 1 can be removed before concrete is poured, improving workability.

[0044] <Summary of the auxiliary tool 1 for slab formwork construction according to the first embodiment> As explained above, the slab formwork construction auxiliary tool 1 according to the embodiment of the present invention comprises: a joist support part 11 detachably attached to the tip of the joist 23 that supports the sheathing boards 21 constituting the slab formwork 2 via the joists 22; and a temporary hanging part 13 provided on the joist support part 11 and temporarily hung on the upper end of the wall formwork 3. The temporary hanging part 13 comprises a formwork upper end placing part 13a that is placed on the upper end of the wall formwork 3; and a formwork upper end placing part 13a that extends downward from the tip of the formwork upper end placing part 13a and is used when the joists 23 are installed. and a connecting portion 13c extending from the rear end of the formwork upper end mounting portion 13a toward the joist receiving portion 11 and connected to the joist receiving portion 11, the connecting portion 13c being lower than the formwork upper end mounting portion 13a by a length substantially equal to the outer diameter R1 of the joist 22, and configured so that a first space S1 in which at least the upper end of the wall formwork 3 is accommodated and a second space S2 which is the range of movement of the joist receiving portion 11 are secured between the hooking portion 13b and the joist receiving portion 11.

[0045] Therefore, in the slab formwork construction auxiliary device 1 of the embodiment of the present invention, by securing the second space S2 which is the range of motion between the wall formwork 3 and the joist support part 11, it is possible to rotate the slab formwork construction auxiliary device 1 with the hook part 13b hooked onto the upper end of the wall formwork 3, using the boundary between the hook part 13b and the formwork upper end mounting part 13a as a fulcrum.

[0046] As a result, the slab formwork construction auxiliary device 1 can be attached to the tip of the joist 23, and the hooking portion 13b of the slab formwork construction auxiliary device 1 can be hooked onto the upper end of the wall formwork 3, and the rear end of the joist 23 can be lifted up so that the formwork upper end placing portion 13a can be placed on the upper end of the wall formwork 3.This makes it easy for a single worker to install the joist 23, significantly reducing the number of workers and effort required to install the joist 23 and improving workability.

[0047] Furthermore, the length L1 in the longitudinal direction of the beam 23 in the movable range S is ensured to be at least longer than the length L4 in the same direction of the beam receiving portion 11.

[0048] Therefore, after the joists 23 are installed, a second space S2 is provided which provides a range of movement for sliding the slab formwork construction auxiliary device 1 in the direction of the wall formwork 3, making it easy and reliable to remove the formwork construction auxiliary device 1 before pouring the slab concrete, thereby improving workability in this respect as well.

[0049] In addition, in the slab formwork construction auxiliary tool 1 according to the embodiment of the present invention, the lower end of the joist receiving portion 11 on the wall formwork 3 side is configured to be cut out obliquely.

[0050] Therefore, when the slab formwork construction auxiliary device 1 is rotated, etc. to remove it from the tip of the joist 23, the notch at the lower end of the joist support part 11 prevents the joist support part 11 from interfering with the formwork fastening fittings 34 or the horizontal end thick member 33, thereby improving workability in this respect as well.

[0051] Furthermore, in the slab formwork construction auxiliary tool 1 according to the embodiment of the present invention, continuous reinforcing ribs 14 are provided on the upper surfaces of the joist receiving portion 11 and the temporary hanging portion 13 .

[0052] Therefore, it is possible to reinforce the strength of the entire auxiliary equipment 1 for slab formwork construction, and it becomes possible to reliably lift the joists 23 in a cantilevered state with the temporary hanging part 13 hooked onto the upper end of the wall formwork 3, thereby improving workability in this respect as well.

[0053] In addition, in the slab formwork construction auxiliary device 1 of the embodiment of the present invention, the beam support portion 11 is provided with side plate portions 11c, 11c that are spaced apart by a distance greater than the thickness of the beam tip and form a pair of opposing surfaces, and one of the left and right side plate portions 11c, 11c is provided with a beam fixing screw 12 that screws into a screw hole (not shown) and removably fixes the tip of the beam 23.

[0054] Therefore, the use of the beam fixing screws 12 makes it easy to fix and remove the tip of the beam 23 at the beam receiving portion 11, thereby improving workability in this respect as well.

[0055] <Variation 1> In the above embodiment, as shown in Figs. 1 to 4, etc., reinforcing ribs 14 are joined to the upper plate portion 11a of the joist receiving portion 11, the hook portion 13b of the temporary hanging portion 13, the formwork upper end placing portion 13a, and the upper surface of the first connecting portion 13c to reinforce the strength of the entire slab formwork construction auxiliary device 1. However, the present invention is not limited to this. For example, as shown in Figs. 10(a) to (c) and Figs. 11(a) to (c), the reinforcing ribs 14 may be omitted, and the length L1 of the formwork upper end placing portion 13a of the temporary hanging portion 13 may be appropriately shortened compared to the case shown in Figs. 1 to 4, etc. The length L1 of the upper end mounting portion 13a should be at least greater than the sum of the thickness T1 (see Figure 1) of the wall sheathing 31 and the thickness T2 (see Figure 1) of the vertical end thick member 32, thereby ensuring a first space S1 so that the formwork upper end mounting portion 13a can be placed on the upper end of the wall formwork 3, and the horizontal length L2 (see Figure 2(a)) and angle (90+β) of the first connecting portion 13c should be such that when the formwork upper end mounting portion 13a is placed on the upper end of the wall formwork 3, a second space S2 is secured between the wall formwork 3 and the tip of the joist 23, which will be the range of motion required to remove the joist support portion 11.

[0056] <Variation 2> Furthermore, in the above embodiment, the beam fixing screw 12 is described as being provided on one of the left and right side plate portions 11c, 11c of the beam receiving portion 11 as shown in Figures 1 to 4, etc., but the present invention is not limited to this, and it may of course also be provided on the bottom plate portion 11b of the beam receiving portion 11, for example, as in variant example 2 shown in Figures 12(a) to (c) and Figures 13(a) to (c). In the auxiliary tool 1' for slab formwork construction of this modified example 2, the length of the formwork upper end placing part 13a' is secured long, and only the vertically extending connecting part 13d' is provided without dividing it into the first connecting part 13c and the second connecting part 13d, and the temporary hanging part 13' is composed of the formwork upper end placing part 13a', the hooking part 13b', and the connecting part 13d', and the hooking part 13b' and the joist receiving part 13d' are provided below the formwork upper end placing part 13a'. 11, the temporary hanging portion 13 may be configured to have a formwork upper end placing portion 13a, a hooking portion 13b, a first connecting portion 13c and a second connecting portion 13d, and to secure the first space S1 and the second space S2, as in the embodiment shown in Figures 1 to 4, etc., or the slab formwork construction auxiliary device 1 of variant example 1 shown in Figures 10 and 11.

[0057] <Variation 3> Furthermore, in the above explanations of the embodiment and variants 1 and 2, it has been explained that the tip of the beam 23 is fixed to the beam support portion 11 by the beam fixing screw 12, as shown in Figures 1 to 4 and Figures 10 to 13, etc. However, the present invention is not limited to this, and for example, as shown in Figures 14(a) to (c) and 15(a) to (c), it is of course also possible to use a wedge piece 15 instead of the beam fixing screw 12 and pass it through a wedge piece through hole provided in the left and right side plate portions 11c, 11c, so that the tip of the beam 23 is fixed to the beam support portion 11 by the wedge piece 15.

[0058] In this modified example 3, the joist receiving portion 11 is formed in a U-shape by the upper plate 11a and the side plates 11c, 11c on both sides without a bottom plate. It goes without saying that the bottom plate may be omitted in the embodiment shown in Figs. 1 to 4 and in modified example 1 shown in Figs. 10 and 11. Also, in the embodiment shown in Figs. 1 to 4 and modified examples 1 and 2 shown in Figs. 10 to 13, the diagonal notches at the lower ends of the side plates 11c, 11c of the joist receiving portion 11 on the wall formwork 3 side may be omitted, as shown in modified example 3. Also, in the slab formwork construction auxiliary tool 1" of modified example 3, which uses this wedge piece 15, the temporary hanging portion 13' may be composed of the formwork upper end placing portion 13a', the hooking portion 13b', and the connecting portion 13d', as in the slab formwork construction auxiliary tool 1' of modified example 2. [Explanation of symbols]

[0059] 1...Auxiliary equipment for slab formwork construction, 11...Joist support part, 11a...Upper plate part, 11b...Bottom plate part, 11c...Side plate part, 11d...Front plate part, 12...Joist fixing screw, 13...Temporary hanging part, 13a, 13a'...Formwork upper end placement part, 13b, 13b'...Hook part, 13c...First connecting part, 13d...Second connecting part, 13d'...Connecting part, 14...Reinforcing rib, 15...Wedge piece, S1, S1'...First space part, S2, S2'...Second space part, 2...Slab formwork, 21...Slab sheathing board, 22...Floor joist, 23...Joist, 3...Wall formwork, 31...Wall sheathing board, 32...Vertical end thick member, 33...Horizontal end thick member, 34...Formwork fastening fittings, 35...Separator.

Claims

1. The formwork is provided with a joist support part that is inserted into the tip of the joist that supports the sheathing board that constitutes the slab formwork via the joists and is detachably attached, and a temporary hanging part that is provided on the joist support part and is temporarily hung on the upper end of the wall formwork, The beam receiving portion is a pair of opposing surfaces spaced apart by a distance equal to or greater than the thickness of the tip of the beam, and one of the pair of opposing surfaces is provided with a beam fixing screw that screws into a screw hole and presses the tip of a threaded rod against the side of the tip of the beam to detachably fix the tip of the beam to the beam receiving part; The temporary hanging portion is A form upper end placement portion placed on the upper end of the wall formwork; a hook portion extending downward from the tip of the formwork upper end mounting portion and hooked onto the upper end of the wall formwork when the joist is installed; a connecting portion extending from the rear end of the form upper end mounting portion toward the beam receiving portion and connected to the beam receiving portion, the connecting portion being lower than the form upper end mounting portion by a length substantially equal to the outer diameter of the joist; This auxiliary device for slab formwork construction is characterized in that the distance between the hook portion and the beam support portion is greater than the sum of the thickness of the upper end of the wall formwork in the direction from the hook portion toward the beam support portion and the length of the beam support portion.

2. The auxiliary tool for slab formwork construction according to claim 1, The joist support portion has left and right side plate portions as a pair of opposing surfaces, and a bottom plate portion connecting the left and right side plate portions, and the lower ends of the left and right side plate portions and the bottom plate portion on the wall formwork side are cut out.This auxiliary device for slab formwork construction is characterized in that

3. The auxiliary tool for slab formwork construction according to claim 1 or 2, An auxiliary device for slab formwork construction, characterized in that continuous reinforcing ribs are provided on the upper surfaces of the joist receiving portion and the temporary hanging portion.

4. A step of fixing the slab formwork construction auxiliary device according to any one of claims 1 to 3 to the tip of the joist; a step of hooking the hooking portion of the slab formwork construction auxiliary device fixed to the tip end of the joist onto the upper end of the wall formwork, lifting the joist, and placing the formwork upper end placing portion on the upper end of the wall formwork; a step of supporting the lower surface of the lifted joist with a support material; A step of removing the slab formwork construction auxiliary device from the joists supported by the support material; a step of placing a slab formwork on the joists via floor joists from which the auxiliary equipment for slab formwork construction has been removed, and pouring the slab concrete.

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