JP7601710B2 - Mounting bracket for load cell for formwork and formwork structure - Google Patents

Description

The present invention relates to a formwork load cell mounting bracket for mounting a load cell that measures the lateral pressure applied to a formwork when concrete is poured, and to a formwork structure.

In the formwork structure for constructing concrete structures, in order to prevent the formwork from being destroyed due to the concrete pressure being too high when pouring concrete, a technology has been proposed in which a load cell is provided in the separator to measure the lateral pressure applied to the formwork when concrete is poured (see, for example, Patent Document 1). In this technology, a load cell body equipped with a female thread that screws into the separator and a screw rod for screwing into the formwork tightening rod is provided between the formwork (dam plate) and the horizontal end thick material.

Japanese Utility Model Application Publication No. 03-16037

However, in the technology described in the above patent document, the load cell body is installed between the formwork (dam plate) and the horizontal end member, so when changing the installation position of the load cell body, the horizontal end member and the end member pressing fittings (washers), etc. must be removed, resulting in poor workability.

The present invention has been made in consideration of these problems, and aims to provide a load cell mounting bracket for formwork and a formwork structure that allows the load cell mounting position to be easily changed without removing the horizontal end thick material or the end thick material holding bracket, improving workability.

In order to solve the above problems, the load cell mounting bracket for formwork of the present invention comprises a load cell fixing stand which is attached to the opposite side of the end thick material abutment portion of the end thick material holding bracket and to which a load cell is fixed, and a fixing nut which screws onto a threaded rod which passes through the end thick material holding bracket and the load cell and fixes the load cell to the load cell fixing stand, and is characterized in that the load cell fixing stand has a fastening nut accommodating section which accommodates a fastening nut which screws onto the threaded rod to press the end thick material holding bracket against the end thick material, and a tool opening into which a tool can be inserted to rotate the fastening nut accommodated in the fastening nut accommodating section.
Furthermore, the formwork load cell mounting bracket of the present invention is also characterized in that the load cell fixing stand is provided with a positioning protrusion that fits into a positioning hole provided on the outer surface of the thick material holding bracket.
In addition, the formwork structure of the present invention is a formwork structure in which the outsides of each of a pair of dam boards installed at a predetermined distance by a separator are supported by an end thick material and an end thick material pressing bracket, and a formwork load cell mounting bracket as described in claim 1 or claim 2 is attached to the opposite side of the end thick material of the end thick material pressing bracket, and a load cell is fixed to the load cell fixing stand of the formwork load cell mounting bracket with the fixing nut.

According to the present invention, the load cell that measures the lateral pressure applied to the formwork during concrete pouring is installed on the opposite side of the end thick material abutment part of the end thick material holding fitting via a load cell fixing stand, and is fixed by a fixing nut provided separately from the fastening nut that fastens the end thick material holding fitting and the end thick material. Therefore, even if the mounting position of the load cell needs to be changed, the mounting position of the load cell can be easily changed without removing the lateral end thick material or the end thick material holding fitting, improving workability.

1 is a plan view showing a formwork on the side to which a load cell is attached using a formwork load cell mounting bracket according to a first embodiment of the present invention. FIG. 1 is a perspective view showing the side of a formwork on which a load cell is attached using a load cell mounting bracket for a formwork of embodiment 1 of the present invention, and on which the load cell is provided. FIG. FIG. 1 is an enlarged perspective view showing a load cell mounted using a formwork load cell mounting bracket according to the first embodiment of the present invention. 1 is a front view showing a formwork on the side to which a load cell is attached using a formwork load cell mounting bracket according to a first embodiment of the present invention. FIG. 1A to 1C are a perspective view, a front view, and a side view, respectively, of a load cell fixing stand that constitutes a load cell mounting bracket for a formwork according to a first embodiment of the present invention. 5A to 5C are a plan view, a cross-sectional view along line AA in FIG. 5C, and a bottom view of a load cell fixing stand that constitutes a load cell mounting bracket for formwork according to the first embodiment of the present invention. 1A and 1B are front views showing procedures 1 and 2 for mounting a load cell using a formwork load cell mounting bracket according to the first embodiment of the present invention. 1A and 1B are front views showing steps 3 and 4 of mounting a load cell using a formwork load cell mounting bracket according to the first embodiment of the present invention. 1A to 1C are a perspective view, a front view, and a side view, respectively, of a load cell fixing stand that constitutes a load cell mounting bracket for a formwork according to a second embodiment of the present invention. 9(a) to 9(c) are a plan view, a bottom view, and a cross-sectional view along line BB in FIG. 9(c), respectively, of a load cell fixing stand that constitutes a load cell mounting bracket for a formwork according to a second embodiment of the present invention. 11A to 11D are respectively a perspective view, a bottom view, a front view, and a cross-sectional view along line CC in FIG. 11C of a load cell fixing stand that constitutes a load cell mounting bracket for a formwork according to a third embodiment of the present invention. 11 is an oblique view of a load cell fixing stand and a thick material pressing bracket which constitute a formwork load cell mounting bracket of embodiment 3 according to the present invention. FIG. 13(a) to 13(f) are respectively a perspective view, a front view, a bottom view, a front view, a left side view, and a right side view of a load cell fixing stand that constitutes a load cell mounting bracket for a formwork according to embodiment 4 of the present invention, and a cross-sectional view taken along line D-D in FIG. 13(e). 13 is an oblique view of a load cell fixing stand and a thick material pressing bracket which constitute a formwork load cell mounting bracket of embodiment 4 of the present invention. FIG.

Below, embodiments 1 to 3 of the load cell mounting bracket for formwork and the formwork structure according to the present invention will be described with reference to the drawings. Note that the embodiments 1 to 3 described below are merely examples of the present invention, and the present invention is not limited to the following embodiments 1 to 3, and can be modified as appropriate within the scope of the creativity of the technical concept of the present invention.

Embodiment 1.
The following describes a formwork load cell mounting bracket 1 and a formwork structure according to the first embodiment of the present invention. First, the formwork structure in which the formwork load cell mounting bracket 1 of the first embodiment is used and a load cell 9 is installed will be described.

<Configuration of formwork structure>
The formwork for pouring concrete is constructed such that the outside of each of the dam panels 2, 2 is supported by vertical end thick members 3a and horizontal end thick members 3b on both sides of a separator 8a provided to hold the dam panels 2, 2 at a specified distance, as shown in Figure 1, and the horizontal end thick members 3b are held down by end thick member holding fittings 7 fastened by fastening nuts 6 that screw onto threaded rods 5.

The threaded rods 5 are connected to the shafts (not shown) of the cones 8b connected to both sides of the separator 8a via the axle feet 4 at the ends of the threaded rods 5. Note that the formwork structure shown in Figure 1 shows a state in which the load cell 9 is installed on the outside of the thick end material pressing bracket 7 on the right side of the figure using the formwork load cell mounting bracket 1 of embodiment 1.

As shown in Figures 3 and 4, the thick end material pressing fitting 7 is composed of a back plate 7a in which a screw rod through hole (not shown) through which the screw rod 5 passes, and a pair of side plate parts 7b, 7b that are bent 90 degrees from both the left and right sides of the back plate part 7a and extend so as to face each other. The end surfaces of the pair of side plate parts 7b, 7b are provided with two thick end material abutment parts 7b1 that are cut out according to the outer shape of the horizontal thick end material 3b so that the horizontal thick end material 3b made of a round pipe or the like can be securely pressed down, and these two thick end material abutment parts 7b1 are configured to press down the two horizontal thick end materials 3b. The members and structures that make up the formwork described above are well known.

<Configuration of formwork load cell mounting bracket 1 and the like according to embodiment 1>
The formwork load cell mounting bracket 1 of embodiment 1 is provided, for example, on the outside of the end thick material pressing bracket 7 that presses the horizontal end thick material 3b as shown in Figures 1 to 4, i.e., on the opposite side of the end thick material abutment portion 7b1 and the horizontal end thick material 3b, and fixes the load cell 9 installed between the load cell fixing frame 11 and the fixing nut 12.

(Load cell fixed stand 11)
As shown in Figures 5 and 6, the load cell fixing stand 11 is composed of a cell fixing base 11a on which the load cell 9 is installed, legs 11b provided on the underside of the cell fixing base 11a, and a stand installation base 11c provided at the lower end of the legs 11b so as to face the cell fixing base 11a.

Since the load cell 9 has a disk or low cylindrical shape, the cell fixing base 11a is formed in a circular shape in a plan view to match the shape and size of the load cell 9, and a threaded rod through hole 11a1 through which the threaded rod 5 passes is formed in the center. Therefore, the inner diameter of the threaded rod through hole 11a1 is formed to be larger than the outer diameter of the threaded rod 5 and smaller than the outer diameter of the load cell 9 so that the load cell 9 can be installed.

The leg 11b is cylindrically shaped to fit the shape and size of the load cell 9, and has a fastening nut housing 11b1 that houses the fastening nut 6 that screws onto the threaded rod 5 and presses the end thick material pressing bracket 7 against the horizontal end thick material 3b, as well as a semicircular tool opening 11b2 that can receive a tool such as an adjustable spanner to rotate the fastening nut 6 housed in the fastening nut housing 11b1. Therefore, the leg 11b has an inner width and height that are greater than the width and thickness of the fastening nut 6.

The frame installation base 11c, like the cell fixing base 11a, is formed in a circular shape in a plan view and is provided with a fastening nut through hole 11c1 that is larger than the outer diameter of the fastening nut 6 screwed onto the threaded rod 5. The load cell fixing frame 11 is configured so that the leg 11b, which is provided with the fastening nut storage portion 11b1 and the tool opening 11b2, is sandwiched between the cell fixing base 11a and the frame installation base 11c, thereby improving the strength or durability of the entire load cell fixing frame 11.

(Fixing nut 12)
The fixing nut 12 is a nut that screws onto the threaded rod 5 to fix the load cell 9 to the cell fixing base portion 11a of the load cell fixing stand 11, and also temporarily fixes the horizontal end thick material 3b via the end thick material holding bracket 7, etc., and is a hexagonal nut like the fastening nut 6.

<Load cell 9>
The load cell 9 is used to measure the lateral pressure applied to the formwork when concrete is poured. It is a commonly available load cell that is disk-shaped or has a low cylindrical shape and has a threaded rod through hole (not shown) in its center through which the threaded rod 5 passes.

<Method of Using the Load Cell Mounting Bracket 1 of the First Embodiment>
Next, a method of using the load cell mounting bracket 1 of the first embodiment configured as above will be described with reference to the drawings.

As shown in Figure 1, in the formwork structure in which the outsides of the sheathing panels 2, 2 are held down by end-thickness material retaining fittings 7 via vertical end-thickness material 3a and horizontal end-thickness material 3b, respectively, on separators 8a provided to hold the sheathing panels 2, 2 at a specified distance, the end-thickness material retaining fittings 7 on both sides are firmly fastened by fastening nuts 6 that screw onto threaded rods 5.

When installing a load cell 9 using the load cell mounting bracket 1 of embodiment 1 in such a formwork structure, the load cell fixing stand 11, the load cell 9, and the fixing nut 12 that constitute the load cell mounting bracket 1 of embodiment 1 are passed in this order onto one side, for example, the threaded rod 5 as shown in FIG. 7(a).

Then, screw in the fixing nut 12 to fix the load cell fixing stand 11 to the outside of the thick end material clamping bracket 7 as shown in FIG. 7(b), and fix the load cell 9 to the cell fixing base 11a of the load cell fixing stand 11.

Next, as shown in FIG. 8(a), the fastening nut 6 that fastens the end thick material holding bracket 7 is loosened, and then concrete is poured into the formwork.

By loosening the fastening nut 6, the horizontal end members 3b and the like are fixed only by the fixing nut 12, so the lateral pressure acting on the formwork when pouring concrete can be accurately measured.

When removing the load cell 9 after concrete pouring is complete, insert a tool such as an adjustable spanner through the tool opening 11b2 (see Figures 5 and 6) in the leg 11b of the load cell fixing stand 11 again, tighten the fastening nut 6 as shown in Figure 8 (b) to press and fix the end thick material holding bracket 7 against the horizontal end thick material 3b, loosen the fixing nut 12 that secures the load cell 9, etc., and remove it from the threaded rod 5, and then remove the load cell 9 and load cell fixing stand 11.

<Summary of the formwork load cell mounting bracket 1 of embodiment 1>
As described above, the formwork load cell mounting bracket 1 of embodiment 1 is composed of a cell fixing base portion 11a, legs 11b and a base installation base portion 11c on the outside of the end thick material holding bracket 7, and is equipped with a load cell fixing base 11 having a fastening nut accommodating portion 11b1 that accommodates the fastening nut 6 that fastens the end thick material holding bracket 7 and a tool opening 11b2 for receiving a tool that rotates the fastening nut 6 accommodated in the fastening nut accommodating portion 11b1, and a fixing nut 12 that screws onto the threaded rod 5 to fix the load cell 9 to the cell fixing base portion 11a of the load cell fixing base 11 and temporarily fixes the horizontal end thick material 3b via the end thick material holding bracket 7 etc.

Therefore, according to the load cell mounting bracket 1 for formwork and the formwork structure of the first embodiment of the present invention, the load cell 9, which measures the lateral pressure applied to the formwork when concrete is poured, is attached via the load cell fixing stand 11 provided on the outside of the end thick material holding bracket 7, i.e., on the opposite side of the end thick material abutment portion 7b1, and fixed with a fixing nut 12. Therefore, even if the mounting position of the load cell 9 needs to be changed, it is possible to easily change the mounting position of the load cell 9 without removing the horizontal end thick material 3b or the end thick material holding bracket 7, thereby improving workability.

In particular, in the formwork load cell mounting bracket 1 of embodiment 1, the load cell fixing stand 11 is configured so that the leg 11b, which is provided with the fastening nut storage portion 11b1 and the tool opening 11b2, is sandwiched between the cell fixing base portion 11a and the base installation base portion 11c, thereby improving the strength or durability of the entire load cell fixing stand 11.

In the above embodiment 1, the formwork load cell mounting bracket 1 is described as having a base 11c at the bottom end of the leg 11b of the load cell fixing base 11, as shown in Figures 6 and 7, but the present invention is not limited to this. For example, it is of course possible to use a load cell fixing base 11' that omits the base 11c, as shown in Figures 9(a) to (c) and 10(a) to (c).

Embodiment 2.
The formwork load cell mounting bracket 1 of the above embodiment 1 has been described using the load cell fixing base 11 consisting of the cell fixing base 11a, legs 11b, and base installation base 11c, which are circular in plan view, or the load cell fixing base 11' consisting of the cell fixing base 11a and legs 11b with the base installation base 11c omitted, but the load cell mounting bracket 1' of embodiment 2 will be described using an example in which a rectangular load cell fixing base 13 is used. Note that the fixing nut 12 is the same as that of embodiment 1, and therefore description thereof will be omitted.

Figures 11(a) to (d) are respectively a perspective view, a bottom view, a front view, and a cross-sectional view along line C-C in Figure 11(c) of the load cell fixing stand 13 constituting the load cell mounting bracket for formwork 1' of embodiment 2 of the present invention, and Figure 12 is a perspective view of the load cell fixing stand 13 and the thick end material pressing bracket 7' constituting the load cell mounting bracket for formwork 1' of embodiment 2.

The formwork load cell mounting bracket 1' of embodiment 2 uses a load cell fixing stand 13 that is composed of a cell fixing base 13a that is square in plan view and four legs 13b that are provided on the underside of the four corners of the cell fixing base 13a.

At the center of the cell fixing base 13a, a threaded rod through hole 13a1 is provided through which the threaded rod 5 constituting the formwork retaining metal fitting passes. The inner diameter of the threaded rod through hole 13a1 is larger than the outer diameter of the threaded rod 5 and smaller than the outer diameter of the load cell 9, allowing the load cell 9 to be installed.

The four legs 13b are rod-shaped, unlike the load cell fixing stands 11, 11' of the formwork load cell mounting bracket 1 of the first embodiment described above, and the fastening nut 6 is accommodated between the outer surface of the end thick material pressing bracket 7' surrounded by the four legs 13b and the cell fixing base 13a. In other words, in the case of the load cell fixing stand 13 of the second embodiment, the space surrounded by the four legs 13b becomes the fastening nut accommodation section in which the fastening nut 6 is accommodated, and the space between the two legs 13b becomes a tool opening into which a tool such as an adjustable spanner can be inserted.

The tip of each of the four legs 13b is provided with a positioning portion 13b1 that is smaller than the outer diameter of the leg 13b.

For this reason, as shown in FIG. 12, a threaded rod through hole 7a1' through which the threaded rod 5 passes is provided on the outer surface of the back plate portion 7a' of the end thick material pressing bracket 7' to which the load cell fixing stand 13 of embodiment 2 is attached, and a positioning hole 7a2' into which the positioning portion 13b1 of each of the four legs 13b fits is provided.

Therefore, according to the load cell mounting bracket 1' for formwork and the formwork structure of the second embodiment of the present invention, the load cell 9 is fixed by the fixing nut 12 to the cell fixing base 13a of the load cell fixing stand 13 provided on the outside of the thick end material holding bracket 7', i.e., on the opposite side of the thick end material abutment portion 7b1'. As with the load cell mounting bracket 1 for formwork of the first embodiment, even if the mounting position of the load cell 9 needs to be changed, it is possible to easily change the mounting position of the load cell 9 without removing the horizontal thick end material 3b or the thick end material holding bracket 7, thereby improving workability.

In particular, in the case of the load cell mounting bracket for formwork 1' of embodiment 2, the legs of the load cell fixing stand 13 are composed of four rod-shaped legs 13b, making it possible to ensure a wide fastening nut storage area and tool opening, which also improves workability in this respect.

In addition, according to the load cell mounting bracket for formwork 1' of the second embodiment of the present invention, the lower ends of the four legs 13b of the load cell fixing frame 13 are provided with positioning portions 13b1, which are configured to fit into the positioning holes 7a2' of the thick material clamping bracket 7'. This prevents the load cell fixing frame 13 from shifting or falling off, improving workability, and improving the strength or durability of the entire load cell fixing frame 13 by fitting the positioning portions 13b1 of the legs 13b into the positioning holes 7a2' of the thick material clamping bracket 7'.

In the second embodiment of the formwork load cell mounting bracket 1', the positioning portion 13b1 is provided on each of the four rod-shaped legs 13b, but the present invention is not limited to this, and the positioning portion 13b1 may of course be omitted.

Embodiment 3.
In the above-mentioned embodiments 1 and 2 of the load cell mounting bracket for formwork 1, 1', 13, the load cell fixing frames 11, 11', 13 have been described as being constructed by joining a plurality of members, but in the load cell mounting bracket for formwork 1" of embodiment 3, an example of a load cell fixing frame 14 formed by cutting and bending a single metal plate will be described. Incidentally, the fixing nut 12 is the same as that in embodiments 1 and 2, and therefore description thereof will be omitted.

Figures 13(a) to (f) are respectively a perspective view, a front view, a bottom view, a front view, a left side view, and a right side view of the load cell fixing stand 14 constituting the load cell mounting bracket 1" for formwork according to embodiment 3 of the present invention, and a cross-sectional view taken along line D-D in Figure 13(e). Figure 14 is a perspective view of the load cell fixing stand 14 and the thick end material pressing bracket 7" constituting the load cell mounting bracket 1" for formwork according to embodiment 3.

As shown in Figs. 13(a) to (e), the load cell fixing stand 14 of the load cell mounting bracket for formwork 1" of embodiment 3 is made by cutting a single metal plate into a rectangular shape while taking into consideration the size of the load cell 9, and then bending it into a U-shape so that the load cell 9 can be accommodated, providing a back plate portion 14a, a first side portion 14b, and a second side portion 14c that is shorter in the vertical direction than the first side portion 14b, and a threaded rod through hole 14a1 is provided in the back plate portion 14a.

Two vertical cuts are made in the first side surface portion 14b, and the portion between the two cuts is left as is, while the portions on both sides are folded toward the second side surface portion 14c at the same location as the vertical length of the second side surface portion 14c to provide folded portions 14b1, 14b1, and the portion between the folded portions 14b1, 14b1 is used as a positioning portion 14b2.

In the case of the load cell fixing stand 14 of the load cell mounting bracket for formwork 1" of embodiment 3, the space surrounded by the back plate portion 14a, the first side portion 14b, and the second side portion 14c becomes the fastening nut storage portion in which the fastening nut 6 is stored, and also becomes the tool opening into which a tool such as an adjustable wrench can be inserted.

For this reason, as shown in FIG. 14, a threaded rod through hole 7a1' through which the threaded rod 5 passes is provided on the outer surface of the back plate portion 7a" of the thick end material pressing bracket 7" to which the load cell fixing stand 14 of embodiment 3 is attached, and a square positioning hole 7a2" into which the positioning portion 14b2 fits is provided.

Therefore, according to the load cell mounting bracket 1" for formwork and the formwork structure of the third embodiment of the present invention, as with the load cell mounting brackets 1, 1' for formwork of the first and second embodiments, even when changing the mounting position of the load cell 9, it is possible to easily change the mounting position of the load cell 9 without removing the horizontal end thick material 3b or the end thick material holding bracket 7, improving workability. In addition, since the load cell fixing stand 14 is formed in a U-shape, it is possible to ensure a wide opening for tools, which also improves workability in this respect.

In addition, in the formwork load cell mounting bracket 1" of embodiment 3 of the present invention, a positioning portion 14b2 is provided on the first side portion 14b of the load cell fixing frame 14 and is configured to fit into the positioning hole 7a2" of the end-thick material pressing bracket 7". This prevents the load cell fixing frame 14 from falling off, improving workability, and improving the strength or durability of the entire load cell fixing frame 14 by fitting the positioning portion 14b2 into the positioning hole 7a2" of the end-thick material pressing bracket 7".

In the embodiment 3 of the formwork load cell mounting bracket 1", the positioning portion 14b2 is provided on the first side portion 14b of the load cell fixing stand 14, but the present invention is not limited to this, and the positioning portion 14b2 may be omitted.

1, 1', 1"... load cell mounting bracket for formwork, 11, 11'... load cell fixing stand, 11a... cell fixing base, 11a1... threaded rod through hole, 11b... legs, 11b1... fastening nut storage section, 11b2... tool opening, 11c... stand installation base, 11c1... fastening nut through hole, 12... fixing nut, 13... load cell fixing stand, 13a... cell fixing base, 13b... legs, 13b1... positioning section, 14... load cell fixing stand 14, 14a... back plate section, 14a1... threaded rod through hole, 14b...first side portion, 14b1, 14b1...bent portion, 14b2...positioning portion, 14c...second side portion, 2...dam plate, 3a...vertical end thick material, 3b...horizontal end thick material, 4...axis foot, 5...threaded rod, 6...fastening nut, 7, 7', 7"...end thick material holding metal fittings, 7a, 7a', 7a"...back plate portion, 7a1, 7a1', 7a1"...threaded rod through hole, 7a2', 7a2"...positioning hole, 7b', 7b"...side plate portion, 7b1, 7b1', 7b1"...end thick material abutment portion, 8a...separator, 8b...cone, 9...load cell.

Claims (3)

A load cell fixing stand is attached to the opposite side of the end thick material abutment portion of the end thick material pressing fitting and to which the load cell is fixed;
a fixing nut that is screwed onto a threaded rod that passes through the end thick material pressing fitting and the load cell, and fixes the load cell to the load cell fixing frame;
The load cell fixing stand is characterized in that it has a fastening nut accommodating portion that accommodates a fastening nut that screws onto the threaded rod and presses the end thick material holding bracket against the end thick material, and a tool opening through which a tool that rotates the fastening nut accommodated in the fastening nut accommodating portion can be inserted. The formwork load cell mounting bracket according to claim 1,
A formwork load cell mounting hardware, characterized in that the load cell fixing stand is provided with a positioning protrusion that fits into a positioning hole provided on the outer surface of the end thick material pressing hardware. A formwork structure in which the outside of each of a pair of dam panels installed at a predetermined distance by a separator is supported by a thick material and a thick material pressing metal fitting, the formwork load cell mounting metal fitting described in claim 1 or claim 2 is attached to the side of the thick material pressing metal fitting opposite the thick material, and the load cell is fixed to the load cell fixing stand of the formwork load cell mounting metal fitting with the fixing nut.

Images