Concrete formwork

Abstract

To provide a concrete formwork which can easily eliminate positional deviation even if the positional deviation occurs in the concrete formwork when an iron pin is fixed. [Solution] The concrete formwork comprises a formwork body (10) and a plurality of box-shaped iron pin-through sections (20) fixed to the formwork face (12a) and the face (12b) opposite the formwork face (12a) of the formwork body (10), and iron pins (50) are passed through the iron pin-through sections (20) to fix the formwork body (10) to an installation face (G) by the iron pins (50), forming a concrete formwork (1), and comprises a fine adjustment mechanism (100) that can finely adjust the relative position of the iron pin-through sections (20) based on the position of the iron pins (50) when the iron pins (50) are fixed.

Description

[Technical Field]

[0001] The present invention relates to concrete forms. [Background technology]

[0002] A technique has been known in the past in which a concrete formwork is fixed to a construction site and concrete is poured into the area defined by the concrete formwork (see, for example, Patent Document 1). In Patent Document 1, the concrete formwork is fixed by passing iron pins through holes in the concrete formwork and driving the iron pins into the installation surface. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-101039 Summary of the Invention [Problem to be solved by the invention]

[0004] Generally, iron pins that secure concrete forms are driven in with a hammer drill or similar. However, there is a problem in that the vibrations generated when driving the pins can cause the concrete forms to shift from their original positions. While it is possible to pull out the iron pins and start over, this is not an easy task because the iron pins are firmly fixed to the installation surface. Therefore, the object of the present invention is to solve the above-mentioned problems and to provide a concrete formwork that can easily correct any misalignment that occurs in the concrete formwork when fixing iron pins. [Means for solving the problem]

[0005] One aspect of the present invention is a concrete formwork comprising a formwork body and a plurality of box-shaped iron pin passing sections fixed to the surface of the formwork body opposite the formwork surface, wherein iron pins are passed through the iron pin passing sections and the formwork body is fixed to the installation surface by the iron pins, and the concrete formwork is provided with a fine adjustment mechanism that can freely fine-adjust the relative position of the iron pin passing sections based on the position of the iron pins when the iron pins are fixed. [Effects of the Invention]

[0006] According to the present invention, it is possible to provide a concrete formwork that can easily eliminate any misalignment that may occur in the concrete formwork when fixing iron pins. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view of a concrete formwork according to a first embodiment. [Figure 2] FIG. 3 is a diagram schematically illustrating a state in which a reinforcing portion according to the first embodiment is viewed from the front side. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] FIG. 2 is an explanatory diagram of the operation of the first embodiment. [Figure 5] FIG. 10 is a diagram schematically illustrating a state in which a reinforcing portion according to a second embodiment is viewed from the front side. [Figure 6] FIG. 6 is a plan view of FIG. 5. DETAILED DESCRIPTION OF THE INVENTION

[0008] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0009] [1. First embodiment] FIG. 1 is a perspective view of a concrete formwork 1 according to the first embodiment. The concrete formwork 1 is installed for laying concrete. The concrete formwork 1 functions as a wall that supports the side edges of the concrete. The concrete formwork 1 is made of steel.

[0010] The concrete formwork 1 has a formwork main body (formwork main body) 10 that extends in a predetermined direction and has a generally L-shaped cross section. The formwork main body 10 has a base plate 11 that is placed on an installation surface G (see Figure 2) such as a roadbed, and a frame plate 12 that extends upward from one widthwise end of the base plate 11. The other widthwise end of the base plate 11 has a bent portion 13 that is bent upward. The frame plate 12 has a formwork surface 12a that contacts the concrete, and an inner surface 12b that is the surface opposite to the formwork surface 12a.

[0011] Hereinafter, the direction in which the concrete formwork 1 extends will be referred to as the left-right direction. In addition, the side of the base plate portion 11 where the bent portion 13 is formed will be referred to as the front side, and the side where the frame plate portion 12 is formed will be referred to as the rear side. In the drawings, the front-to-rear direction is indicated by the X axis, the left-to-right direction is indicated by the Y axis, and the up-down direction is indicated by the Z axis. In addition, in the drawings, the arrow direction of the X axis is indicated as the forward direction, the arrow direction of the Y axis is indicated as the leftward direction, and the arrow direction of the Z axis is indicated as the upward direction.

[0012] The base plate 11 and the frame plate 12 are connected by a reinforcing portion (iron pin insertion portion) 20 that is formed in an inverted U-shape when viewed from the front. Specifically, the reinforcing portion 20 has a rectangular plate-like top surface 21 extending in the left-right direction, a rectangular plate-like left side surface 22 that extends downward from the left end of the top surface 21, and a rectangular plate-like right side surface 23 that extends downward from the right end of the top surface 21. The top surface 21 and the side surfaces 22, 23 are fixed at their rear ends to the inner surface 12b, which is the front surface of the frame plate 12. The side surfaces 22, 23 are fixed at their lower ends to the top surface of the base plate 11. The reinforcing portion 20, which is in an inverted U-shape when viewed from the front, is closed at the rear and bottom. Thus, the reinforcing portion 20 has a box-like shape that is open at the front.

[0013] A pin-through hole 21a is formed in the upper surface portion 21 so as to penetrate the upper surface portion 21 in the thickness direction. The pin-through hole 21a is formed in a circular shape. A pair of front and rear protrusions 24 extending in the left-right direction are formed behind the pin-through hole 21a.

[0014] A plurality of reinforcing portions 20 are arranged in the longitudinal direction, i.e., the left-right direction. In this embodiment, five reinforcing portions 20 are arranged. The reinforcing portions 20 are arranged at equal intervals in the longitudinal direction of the form body 10.

[0015] FIG. 2 is a diagram schematically illustrating the reinforcing portion 20 according to the first embodiment as viewed from the front side. Directly below the pin passage hole 21a of the reinforcing portion 20, i.e., in the base plate portion 11 of the formwork main body portion 10, a pin passage hole 11a penetrating in the thickness direction is formed. In this embodiment, the pin passage hole 11a is formed to be the same size as the pin passage hole 21a. The upper pin passage hole 21a and the lower pin passage hole 11a are connected by a guide pipe 25 extending in the vertical direction.

[0016] In this embodiment, the guide pipe 25 is fixed to the upper surface portion 21 and the base portion 11 with the guide pipe 25 inserted into the pin-through holes 21a, 11a. Therefore, the inner diameter of the guide pipe 25 defines the inner diameters of the pin-through holes 21a, 11a. Hereinafter, the upper end of the guide pipe 25 will also be referred to as the pin-through hole 21a. The lower end of the guide pipe 25 will also be referred to as the pin-through hole 11a.

[0017] An iron pin 50 is passed through the pin-through hole 21a. The iron pin 50 has a shaft 51 extending in the vertical direction, a tapered tip 52 provided at the lower end of the shaft 51, and a disk-shaped head 53 provided at the upper end of the shaft 51. The head 53 has a larger diameter than the shaft 51. Here, the shaft portion 51 has a diameter smaller than the inner diameter of the guide pipe 25. Therefore, when the iron pin 50 is passed through the guide pipe 25, the shaft portion 51 can move radially within the guide pipe 25. The head portion 53 is formed to be larger than the outer diameter of the guide pipe 25.

[0018] The iron pin 50 is passed through the reinforcing portion 20 and inserted into the installation surface G, thereby fixing the concrete formwork 1 to the installation surface G. This allows the concrete formwork 1 to remain stationary against the pressure applied to the concrete formwork 1 when concrete is poured.

[0019] In the concrete formwork 1 of this embodiment, the reinforcing parts 20 at both the left and right ends of the five reinforcing parts 20 are provided with fine adjustment mechanisms 100 (see FIG. 1).

[0020] FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2 and 3, in the reinforcing part 20 where the fine adjustment mechanism 100 is provided, the guide pipe 25 is divided into upper and lower parts. That is, the fine adjustment mechanism 100 has an upper guide pipe 25a and a lower guide pipe 25b as the guide pipes 25. The upper guide pipe 25a is fixed to the top surface part 21. The lower guide pipe 25b is fixed to the base part 11. A predetermined adjustment space S having a vertical width is formed between the upper guide pipe 25a and the lower guide pipe 25b.

[0021] Slots 22a, 23a extending in the front-rear direction are formed in the left and right side surface portions 22, 23, respectively, according to the adjustment space S. The slots 22a, 22b are rectangular holes that penetrate the side surface portions 22, 23 in the thickness direction.

[0022] The positions of the elongated holes 22a and 23a in the vertical direction overlap with the adjustment space S. In this embodiment, the positions of the elongated holes 22a and 23a in the vertical direction are included in the position of the adjustment space S in the vertical direction.

[0023] Further, the positions of the elongated holes 22a, 23a in the front-rear direction overlap with the adjustment space S. In this embodiment, front end faces 22a1, 23a1 (see FIG. 3) of the elongated holes 22a, 23a are located forward of the guide pipe 25. Rear end faces 22a2, 23a2 (see FIG. 3) of the elongated holes 22a, 23a are located rearward of the guide pipe 25.

[0024] A pair of wedge members 41, 42 are inserted and attached into the elongated holes 22a, 23a. At this time, it is desirable that the wedge members 41, 42 are lightly press-fitted into the elongated holes 22a, 23a. The wedge members 41, 42 are made of steel. The wedge members 41, 42 pass through the left and right elongated holes 22a, 23a. The wedge members 41, 42 are arranged straddling the left side surface portion 22 and the right side surface portion 23. The wedge members 41, 42 in this embodiment have the same shape.

[0025] As shown in FIG. 3, the wedge members 41 and 42 have a guide surface 43 extending in the left-right direction and a clamping surface 44 inclined relative to the guide surface 43. The wedge members 41 and 42 are arranged so that the clamping surfaces 44 face each other across the guide pipe 25 in a plan view (see FIG. 3). Therefore, the wedge member 41 is arranged so that the guide surface 43 abuts against the front end surfaces 22a1 and 23a1 of the elongated holes 22a and 23a. The wedge member 42 is arranged so that the guide surface 43 abuts against the rear end surfaces 22a2 and 23a2 of the elongated holes 22a and 23a. The guide surface 43 can be guided by the front-rear end surfaces 22a1, 23a1, 22a2, and 23a2 of the elongated holes 22a and 23a.

[0026] A retainer 45 is supported on the pointed end of each of the wedge members 41 and 42. The retainer 45 is formed to be larger in the vertical direction than the vertical width of each of the elongated holes 23a and 22a. When the retainer 45 abuts against the side surfaces 22 and 23 with the guide surface 43 abutting against the front-rear end surfaces 22a1, 23a1, 22a2, and 23a2 of the elongated holes 22a and 23a, i.e., when the guide surface 43 abuts against the front-rear end surfaces 22a1, 23a1, 22a2, and 23a2 of the elongated holes 22a and 23a and the wedge members 41 and 42 are prevented from falling out by the retainer 45, the wedge members 41 and 42 are configured to retract from the guide pipe 25. In other words, the wedge members 41 and 42 are configured to move to positions where they do not abut against the iron pin 50 passing through the guide pipe 25 (see FIG. 3). Hereinafter, when the guide surface 43 abuts against the front-rear end faces 22a1, 23a1, 22a2, 23a2 of the elongated holes 22a, 23a and the retainer 45 abuts against the side portions 22, 23, this state is referred to as the wedge members 41, 42 moving to the "adjustment start position."

[0027] A head 46 is supported on the blunt side of the wedge members 41, 42. The head 46 is formed to be larger in the vertical direction than the vertical width of the elongated holes 23a, 22a. The head 46 and the retainer 45 prevent the wedge members 41, 42 from falling out of the elongated holes 22a, 23a. The head 46 may be omitted.

[0028] The upper guide pipe 25a, the lower guide pipe 25b, the elongated holes 22a and 22b, and the wedge members 41 and 42 constitute the fine adjustment mechanism 100 of this embodiment.

[0029] Figure 4 is an explanatory diagram of the operation of the first embodiment. Figure 4 shows the operation of moving the concrete formwork 1 forward using the fine adjustment mechanism 100 when the concrete formwork 1 is displaced rearward from the reference position during construction. In Figure 4, the center position of the shaft portion 51 of the iron pin 50 is indicated by L0. The position of the front end of the reinforcing portion 20 is indicated by L1. The reference position during construction is indicated by N.

[0030] The concrete formwork 1 is positioned in accordance with a level line (not shown) that indicates the reference point during construction. Once the concrete formwork 1 is aligned with the level line, the wedge members 41, 42 are set to the adjustment start position. Then, the iron pin 50 is passed through the pin-through hole 21a of the reinforcing part 20 and inserted along the guide pipe 25, until the tip 52 penetrates the installation surface G. In this state, when the iron pin 50 is driven with, for example, a hammer drill, the iron pin 50 penetrates the installation surface G and the head 53 comes into contact with the upper surface 21 of the reinforcing part 20. In this way, the concrete formwork 1 is fixed to the installation surface G.

[0031] At this time, vibrations from the hammer drill may be transmitted to the concrete formwork 1, causing the concrete formwork 1 to be fixed to the installation surface G in a position that is displaced from the reference position. In contrast, in this embodiment, the fine adjustment mechanism 100 is configured to be able to eliminate the positional displacement of the concrete formwork 1.

[0032] Specifically, as shown in FIG. 4, the head 46 of the wedge member 41 is struck with a hammer against the wedge members 41 and 42, which are set in the adjustment start position, to push the wedge member 41 toward the tip. As the wedge member 41 is pushed in, the clamping surface 44 abuts against the shaft 51 of the iron pin 50 (see the dashed line in FIG. 4). Furthermore, as the wedge member 41 is pushed in, the wedge shape of the wedge member 41 increases the distance between the iron pin 50 and the guide surface 43 (see the two-dot chain line in FIG. 4). In other words, the concrete formwork 1 moves forward by an amount δ relative to the iron pin 50, which is fixed to the installation surface G and does not move. Therefore, if the concrete formwork 1 is displaced rearward from its reference position during construction, this displacement can be eliminated.

[0033] The remaining wedge member 42 is then pushed toward the tip end, for example by hitting it with a hammer, until it abuts against the iron pin 50. Then, by appropriately hitting the wedge members 41, 42 on both sides, the iron pin 50 is clamped between the wedge members 41, 42 on both sides, and the reinforcing portion 20 is fixed via the pair of wedge members 41, 42. Therefore, the concrete formwork 1 can be installed in a state where any misalignment from the reference position during construction is eliminated. This prevents concrete from being poured while still misaligned, makes it easier to align the positions of the construction joints with the positions of the cutter joints that will be installed after the concrete has hardened, and also helps to prevent construction defects.

[0034] As described above, the concrete formwork 1 to which the present invention is applied comprises a formwork main body 10 and a plurality of box-shaped reinforcing members 20 fixed to the inner surface 12b of the formwork main body 10 opposite the formwork surface 12a, and the formwork main body 10 is fixed to the installation surface G by passing iron pins 50 through the reinforcing members 20. This concrete formwork 1 is provided with a fine adjustment mechanism 100 that can freely finely adjust the relative position of the reinforcing members 20 based on the position of the iron pins 50 when the iron pins 50 are fixed. According to this configuration, the form main body 10 can be finely adjusted relative to the iron pins 50 after the iron pins 50 are fixed. Therefore, even if the concrete form 1 is displaced when the iron pins 50 are fixed, the displacement of the concrete form 1 can be easily corrected.

[0035] In this embodiment, the fine adjustment mechanism 100 includes elongated holes 22a, 23a provided in the side portions 22, 23 of the reinforcing portion 20, which are perpendicular to the formwork surface 12a of the formwork main body portion 10, and two wedge members 41, 42 inserted into the elongated holes 22a, 23a with an iron pin 50 sandwiched between them. According to this configuration, the position of the concrete formwork 1 can be finely adjusted by the simple operation of pushing in the wedge members 41 and 42.

[0036] [2. Second Embodiment] Next, a second embodiment will be described. Note that the same components as those in the first embodiment will be given the same reference numerals, and the description thereof may be omitted.

[0037] Fig. 5 is a diagram schematically illustrating a state in which a reinforcing portion 20 according to the second embodiment is viewed from the front side, and Fig. 6 is a plan view of Fig. 5. In the concrete formwork 1 of the second embodiment, a fine adjustment mechanism 200 is provided in place of the fine adjustment mechanism 100.

[0038] The fine adjustment mechanism 200 of the second embodiment has an inner box 220. In this embodiment, the inner box 220 is configured in a rectangular tubular shape. Specifically, it has a rectangular plate-shaped upper surface portion 221, a rectangular plate-shaped left side surface portion 222 extending downward from the left end of the upper surface portion 221, a rectangular plate-shaped right side surface portion 223 extending downward from the right end of the upper surface portion 221, and a rectangular plate-shaped lower surface portion 224 connecting the lower ends of the left and right side surfaces 222, 223. The inner box 220 is formed to be one size smaller than the reinforcing portion 20. The inner box 220 is housed in the reinforcing portion 20 (outer box, first member) that forms a box shape. The inner box 220 is housed so as to be movable in the front-to-rear direction along the box shape of the reinforcing portion 20. The reinforcing portion 20 corresponds to the outer box relative to the inner box 220. The inner box 220 is prevented from coming off the reinforcing part 20 by the bent part 13 (see FIG. 1).

[0039] The upper surface 221 and the lower surface 224 of the inner box 220 are connected by a guide pipe 225. The inner diameter of the guide pipe 225 is formed to a size corresponding to the outer diameter of the shaft portion 51 of the iron pin 50. That is, in this embodiment, when the iron pin 50 is passed through the guide pipe 225, the guide pipe 225 is formed to a size such that there is no play with respect to the iron pin 50.

[0040] A fastening portion 226 is provided on one of the side surface portions 222, 223 of the inner box 220. In this embodiment, the fastening portion 226 is provided on the left side surface portion 222. The fastening portion 226 is provided to correspond to the position of the elongated hole 22a in the side surface portion 22 of the reinforcing portion 20. The fastening portion 226 is formed, for example, by a hole that penetrates the side surface portion 222 and a nut welded to the inner surface of the side surface portion 222. A bolt 227 inserted through the elongated hole 22a in the side surface portion 22 is fastened to the fastening portion 226. The fastening portion 226 and the bolt 227 form the fixture of this embodiment.

[0041] Instead of the circular pin passage holes 21a of the first embodiment, elongated pin passage holes 221a extending in the front-rear direction are provided in the upper surface portion 21 of the reinforcing portion 20. The pin passage holes 221a are holes that are longer in the front-rear direction than the pin passage holes 21a. Similarly, in place of the circular pin passage holes 11a of the first embodiment, elongated pin passage holes 211a extending in the front-rear direction are provided in the base plate portion 11. The pin passage holes 211a are formed in the same shape as the pin passage holes 221a.

[0042] In the right side surface portion 23, the long hole 23b of the first embodiment is omitted.

[0043] The inner box 220, the guide pipe 225, the fastening portion 226, the bolt 227, the reinforcing portion 20, and the pin-through hole 211a of the base portion 11 constitute the fine adjustment mechanism 200 of this embodiment.

[0044] Next, the operation of this embodiment will be described. In this embodiment, when the concrete formwork 1 is positioned in accordance with the level string (not shown), the iron pin 50 is passed through the pin-through hole 221a of the reinforcing part 20 and inserted along the guide pipe 225 of the inner box 220, and the tip part 52 is stuck into the installation surface G. In this state, when the iron pin 50 is driven with, for example, a hammer drill, the iron pin 50 is stuck into the installation surface G and the head part 53 comes into contact with the upper surface part 21 of the reinforcing part 20.

[0045] If the concrete formwork 1 is displaced from the reference position at this time, the reinforcing part 20, which is the outer box, and the formwork main body 10 to which the reinforcing part 20 is fixed are hit with a hammer in a direction that will eliminate the displacement. At this time, because the bolt 227 is not fastened to the fastening part 226, the reinforcing part 20 and the inner box 220 can move relative to each other, and the inner box 220 is substantially integral with the iron pin 50. Therefore, the reinforcing part 20 moves relative to the inner box 220. This makes it possible to eliminate the displacement of the concrete formwork 1 relative to the iron pin 50. Then, after the displacement is eliminated, the bolt 227 is fastened to the fastening part 226, and the reinforcing part 20 and the inner box 220 are fixed. In other words, the concrete formwork 1 is fixed to the iron pin 50 in a state where the displacement is eliminated.

[0046] As described above, in the concrete formwork 1 of the second embodiment, a fine adjustment mechanism 200 is provided instead of the fine adjustment mechanism 100 of the first embodiment. Therefore, in the second embodiment, as in the first embodiment, the formwork main body 10 can be finely adjusted relative to the iron pins 50 after the iron pins 50 are fixed. Therefore, even if the concrete formwork 1 is misaligned when the iron pins 50 are fixed, the misalignment of the concrete formwork 1 can be easily eliminated.

[0047] In this embodiment, the fine adjustment mechanism 200 includes a reinforcing part 20 as a first member and an inner box 220 as a second member, the reinforcing part 20 being fixed to the formwork main body 10, and the inner box 220 being fixed to the installation surface G through iron pins 50. The relative position of the reinforcing part 20 can be finely adjusted based on the position of the inner box 220, and includes fastening parts 226 and bolts 227 as fixing devices that fix the reinforcing part 20 and the inner box 220 together after the relative position has been finely adjusted. According to this configuration, since it is easy to fix the reinforcing part 20 and the inner box 220 after eliminating the misalignment, it is easy to fix the concrete formwork 1 in a state where the misalignment has been reliably eliminated.

[0048] In this embodiment, the reinforcing part 20 is an outer box, and the inner box 220 is an inner box housed in the reinforcing part 20 as the outer box. According to this configuration, a part of the fine adjustment mechanism 200 can be disposed inside the reinforcing part 20 serving as an outer box, which makes it easier to reduce the external size.

[0049] 3. Other Embodiments The above embodiment shows a specific example to which the present invention is applied, and does not limit the form to which the invention is applied.

[0050] In the above embodiment, the fine adjustment mechanisms 100, 200 are described as being provided only on the reinforcing portions 20 at both the left and right ends, but they may also be provided on reinforcing portions 20 other than the reinforcing portions 20 at both the left and right ends, specifically, on the three reinforcing portions 20 in the central portion.

[0051] In the above embodiment, the concrete formwork 1 is configured to have five reinforcing portions 20, but the present invention is also applicable to a configuration in which two or more reinforcing portions 20 are provided.

[0052] In the second embodiment, the inner box 220 has been exemplified as having a rectangular cylindrical shape, but is not limited thereto. For example, the inner box 220 may be a square cylindrical shape with one open side and a bottom, or a rectangular parallelepiped shape with its front side closed. In other words, the inner box 220 may have any shape as long as it has sufficient strength and can move in the front-rear direction within the box-shaped reinforcing part 20.

[0053] In the second embodiment, the bolt 227 and the fastening portion 226 are described as being provided on the left side surface portion 222 of the inner box 220, but they may also be provided on the right side surface portion 223. The bolt 227 and the fastening portion 226 may also be provided on the top surface portion 221, etc. Furthermore, the bolt 227 and the fastening portion 226 are not limited to being provided in only one location on the inner box 220, and may be provided in multiple locations. For example, the bolt 227 and the fastening portion 226 may be provided on both the left side surface portion 222 and the right side surface portion 223.

[0054] In the second embodiment, the elongated holes 22a through which the bolts 227 are passed are the same as those in the first embodiment, but elongated holes through which the bolts 227 are passed may be formed in accordance with the amount of movement of the inner box 220 in the front-rear direction. In other words, elongated holes of a different size may be used instead of the elongated holes 22a in the first embodiment. [Explanation of symbols]

[0055] 1 Concrete formwork 10 Formwork body (formwork body) 12a Formwork surface 12b Inner surface (opposite surface) 20 Reinforcement part (outer box, first member, iron pin insertion part) 22 Side part (surface of iron pin insertion part) 22a long hole 23 Side part (surface of iron pin insertion part) 23a long hole 41 Wedge member 42 Wedge member 50 iron pins 100 Fine adjustment mechanism 200 Fine adjustment mechanism 220 Inner box (second component) 226 Fastening part (fixing tool) 227 Bolts (fixtures) G Installation surface

Claims

1. A concrete formwork comprising a formwork body and a plurality of box-shaped iron pin insertion portions fixed to a surface of the formwork body opposite to the formwork surface, wherein iron pins are inserted into the iron pin insertion portions, and the formwork body is fixed to an installation surface by the iron pins, a fine adjustment mechanism that can finely adjust the relative position of the iron pin insertion part based on the position of the iron pin when the iron pin is fixed; Concrete formwork.

2. The fine adjustment mechanism includes: A long hole provided on a surface of the iron pin insertion portion that is perpendicular to the form surface of the form body; two wedge members inserted into the elongated holes with the iron pin between them; Equipped with The concrete formwork according to claim 1.

3. The fine adjustment mechanism includes: a first member and a second member that constitute the iron pin insertion portion; The first member is fixed to the formwork body, The second member is fixed to the installation surface through the iron pin, The first member is capable of finely adjusting a relative position based on the position of the second member, and includes a fixture that fixes the first member and the second member after the fine adjustment of the relative position. The concrete formwork according to claim 1.

4. the first member is an outer box; The second member is an inner box housed in the outer box. The concrete formwork according to claim 3.

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