Concrete formwork

Abstract

To provide a concrete formwork that allows for easy correction of positional misalignment even if misalignment occurs in the concrete formwork when fixing iron pins. [Solution] The concrete formwork comprises a formwork body (10) and a plurality of box-shaped iron pin insertion parts (20) fixed to the surface (12b) of the formwork body (10) opposite to the formwork surface (12a), and the formwork body (10) is fixed to the installation surface (G) by passing iron pins (50) through the iron pin insertion parts (20), and the concrete formwork (1) comprises a fine adjustment mechanism (100) that allows for fine adjustment of the relative position of the iron pin insertion parts (20) with respect to the position of the iron pins (50) when the iron pins (50) are fixed.

Description

Technical Field

[0001] The present invention relates to a concrete formwork.

Background Art

[0002] Conventionally, a technique of fixing a concrete formwork at a construction site and placing concrete in a range partitioned by the concrete formwork is known (see, for example, Patent Document 1). In Patent Document 1, an iron pin is passed through a hole in the concrete formwork and driven into the installation surface to fix the concrete formwork.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Generally, an iron pin for fixing a concrete formwork is driven in with a hammer drill or the like. However, there is a problem that the concrete formwork may be displaced from its original installation position due to the vibration during driving. Although it is conceivable to pull out the iron pin and re-do it, since the iron pin is firmly fixed to the installation surface, the re-doing work is not easy. Therefore, an object of the present invention is to solve the above-described problems and provide a concrete formwork that can easily eliminate misalignment even if misalignment occurs in the concrete formwork when fixing an iron pin.

Means for Solving the Problems

[0005] An aspect of the present invention is a concrete formwork comprising a formwork body and a plurality of box-shaped iron pin insertion parts fixed to the surface of the formwork body opposite to the formwork surface, wherein iron pins are passed through the iron pin insertion parts 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 allows for fine adjustment of the relative positions of the iron pin insertion parts with respect to 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 makes it easy to correct positional misalignment even if misalignment occurs in the concrete formwork when fixing iron pins. [Brief explanation of the drawing]

[0007] [Figure 1] This is a perspective view of the concrete formwork according to the first embodiment. [Figure 2] This diagram schematically shows the reinforcing portion according to the first embodiment as viewed from the front. [Figure 3] This is a cross-sectional view taken along line III-III in Figure 2. [Figure 4] This is an explanatory diagram of the operation of the first embodiment. [Figure 5] This diagram schematically shows the reinforcement portion according to the second embodiment as viewed from the front. [Figure 6] Figure 5 is a plan view. [Modes for carrying out the invention]

[0008] The embodiments for carrying out the present invention will be described in detail below with reference to the attached drawings.

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

[0010] The concrete formwork 1 has a formwork body (formwork body) 10 with a substantially L-shaped cross-section that extends in a predetermined direction. The formwork body 10 has a base plate 11 that is installed on an installation surface G such as a roadbed (see Figure 2), and a form plate 12 that extends upward from one end in the width direction of the base plate 11. A bent portion 13 that is bent upward is formed at the other end in the width direction of the base plate 11. The form plate 12 has a formwork surface 12a that abuts against the concrete, and an inner surface 12b which is the surface opposite to the formwork surface 12a.

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

[0012] The substrate portion 11 and the frame plate portion 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-shaped upper surface portion 21 extending in the left-right direction, a rectangular plate-shaped left side portion 22 extending downward from the left end of the upper surface portion 21, and a rectangular plate-shaped right side portion 23 extending downward from the right end of the upper surface portion 21. The upper surface portion 21 and the side portions 22 and 23 are fixed at their rear ends to the inner surface 12b, which is the front surface of the frame plate portion 12. The side portions 22 and 23 are fixed at their lower ends to the upper surface of the substrate portion 11. The reinforcing portion 20, which is inverted U-shaped when viewed from the front, is closed at the rear and bottom. Therefore, the reinforcing portion 20 forms a box shape with the front open.

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

[0014] The reinforcing portions 20 are arranged in plurality in the left-right direction which is the longitudinal direction. In the present embodiment, five reinforcing portions 20 are arranged. The reinforcing portions 20 are arranged at equal intervals in the longitudinal direction of the formwork main body portion 10.

[0015] FIG. 2 is a diagram schematically showing a state of the reinforcing portion 20 according to the first embodiment as viewed from the front side. Immediately below the pin-through holes 21a of the reinforcing portion 20, that is, in the substrate portion 11 of the formwork main body portion 10, pin-through holes 11a penetrating in the thickness direction are formed. In the present embodiment, the pin-through holes 11a are formed to have the same size as the pin-through holes 21a. The upper pin-through holes 21a and the lower pin-through holes 11a are connected by a guide pipe 25 extending in the vertical direction.

[0016] In the present embodiment, the guide pipe 25 is fixed to the upper surface portion 21 and the substrate portion 11 in a state where the guide pipe 25 is inserted into the pin-through holes 21a and 11a. Therefore, the inner diameter of the guide pipe 25 defines the inner diameters of the pin-through holes 21a and 11a. Hereinafter, the upper end of the guide pipe 25 is also referred to as the pin-through hole 21a. Also, the lower end of the guide pipe 25 is also 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 portion 51 extending in the vertical direction, a tapered tip portion 52 provided at the lower end of the shaft portion 51, and a disk-shaped head portion 53 provided at the upper end of the shaft portion 51. The head portion 53 has a larger diameter than the shaft portion 51. Here, the shaft portion 51 has a smaller diameter 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 is movable in the radial direction within the guide pipe 25. The head portion 53 is formed to be larger than the outer diameter of the guide pipe 25.

[0018] When the iron pin 50 is passed through the reinforcing portion 20 and inserted into the installation surface G, the concrete formwork 1 is fixed to the installation surface G. Thereby, the concrete formwork 1 can be stationary against the pressure applied to the concrete formwork 1 during the placing of concrete.

[0019] In the concrete formwork 1 of the present embodiment, among the five reinforcing parts 20, the left and right end reinforcing parts 20 are provided with fine adjustment mechanisms 100 (refer to FIG. 1).

[0020] FIG. 3 is a sectional view taken along line III-III of FIG. 2. In FIGS. 2 and 3, in the reinforcing part 20 provided with the fine adjustment mechanism 100, the guide pipe 25 is vertically divided. That is, the fine adjustment mechanism 100 has an upper guide pipe 25a and a lower guide pipe 25b as the guide pipe 25. The upper guide pipe 25a is fixed to the upper surface part 21. The lower guide pipe 25b is fixed to the substrate part 11. A predetermined adjustment space S having an up-and-down width is formed between the upper guide pipe 25a and the lower guide pipe 25b.

[0021] According to the adjustment space S, elongated holes 22a and 23a extending in the front-rear direction are respectively formed in the left and right side surface parts 22 and 23. The elongated holes 22a and 22b are rectangular holes penetrating the side surface parts 22 and 23 in the thickness direction.

[0022] The positions occupied by the elongated holes 22a and 23a in the up-and-down direction overlap with the adjustment space S. In the present embodiment, the positions occupied by the elongated holes 22a and 23a in the up-and-down direction are included in the positions occupied by the adjustment space S in the up-and-down direction.

[0023] Also, the positions occupied by the elongated holes 22a and 23a in the front-rear direction overlap with the adjustment space S. In the present embodiment, the front end faces 22a1 and 23a1 (refer to FIG. 3) of the elongated holes 22a and 23a are located in front of the guide pipe 25. The rear end faces 22a2 and 23a2 (refer to FIG. 3) of the elongated holes 22a and 23a are located behind the guide pipe 25.

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

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

[0026] A retaining element 45 is supported at the pointed end of each wedge member 41 and 42. The retaining element 45 is formed to be larger in the vertical direction than the vertical width of the elongated holes 23a and 22a. When the guide surface 43 is in contact with the front-rear end faces 22a1, 23a1, 22a2, and 23a2 of the elongated holes 22a and 23a, and the retaining element 45 is in contact with the side portions 22 and 23, that is, when the wedge members 41 and 42 are prevented from coming out by the retaining element 45 while the guide surface 43 is in contact with the front-rear end faces 22a1, 23a1, 22a2, and 23a2 of the elongated holes 22a and 23a, the wedge members 41 and 42 are configured to retract from the guide pipe 25. In other words, in this case, the wedge members 41 and 42 are configured to move to a position where they do not come into contact with the iron pin 50 that passes through the guide pipe 25 (see Figure 3). Hereinafter, when the guide surface 43 is in contact with the front-rear end faces 22a1, 23a1, 22a2, and 23a2 of the elongated holes 22a and 23a, and the retaining element 45 is in contact with the side portions 22 and 23, the wedge members 41 and 42 will be referred to as moving to the "adjustment start position".

[0027] The blunt sides of the wedge members 41 and 42 are supported by heads 46. The heads 46 are formed to be larger in the vertical direction than the vertical width of the elongated holes 23a and 22a. The heads 46 and retainers 45 prevent the wedge members 41 and 42 from falling out of the elongated holes 22a and 23a. The heads 46 may be omitted.

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

[0029] Figure 4 is an explanatory diagram of the operation of the first embodiment. Figure 4 shows the operation to correct positional misalignment, in which the fine adjustment mechanism 100 moves the concrete formwork 1 forward when it has shifted backward from the reference position during construction. In Figure 4, the position of the center 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. Furthermore, the reference position during construction is indicated by N.

[0030] The concrete formwork 1 is positioned according to a string line (not shown) that indicates the reference point during construction. When the concrete formwork 1 is aligned with the string line, the wedge members 41 and 42 are set to the adjustment start position. Then, the iron pin 50 is passed through the pin hole 21a of the reinforcing part 20 and inserted along the guide pipe 25, with its tip 52 piercing the installation surface G. In this state, if the iron pin 50 is driven in, for example, with a hammer drill, the iron pin 50 will pierce the installation surface G, and its head 53 will come 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] In this process, vibrations from the hammer drill were transmitted to the concrete formwork 1, sometimes causing the concrete formwork 1 to be fixed to the installation surface G in a position misaligned from the reference point. In contrast, this embodiment is configured to eliminate the misalignment of the concrete formwork 1 using a fine adjustment mechanism 100.

[0032] Specifically, as shown in Figure 4, the wedge members 41 and 42, which are set at the adjustment start position, are struck with a hammer on the head 46 of the wedge member 41 to push the wedge member 41 toward the tip. As the wedge member 41 is pushed in, the clamping surface 44 of the wedge member 41 comes into contact with the shaft portion 51 of the iron pin 50 (see dashed line in Figure 4). Furthermore, as the wedge member 41 is pushed in, the wedge shape of the wedge member 41 causes the distance between the iron pin 50 and the guide surface 43 to widen (see dashed line in Figure 4). In other words, relative to the iron pin 50, which is fixed to the installation surface G and does not move, the concrete formwork 1 moves forward by an amount δ. Therefore, if the concrete formwork 1 is shifted backward from the reference position during construction, this misalignment can be corrected.

[0033] Then, the remaining wedge member 42 is hammered to push it towards the tip and bring it into contact with the iron pin 50. By hammering the wedge members 41 and 42 on both sides as appropriate, the iron pin 50 is clamped between the wedge members 41 and 42 on both sides, and the reinforcing part 20 is fixed via the pair of wedge members 41 and 42. As a result, it is possible to install the concrete formwork 1 with the positional deviation from the reference position during construction eliminated. Therefore, it is possible to prevent concrete from being poured while the formwork is misaligned, and it is easier to align the position of the construction joint with the position of the cutter joint to be installed after the concrete hardens, thus reducing the likelihood of construction defects.

[0034] As described above, the concrete formwork 1 to which the present invention is applied comprises a formwork body 10 and a plurality of box-shaped reinforcing parts 20 fixed to the inner surface 12b of the formwork body 10 opposite to the formwork surface 12a. Iron pins 50 are passed through the reinforcing parts 20, and the formwork body 10 is fixed to the installation surface G by the iron pins 50. This concrete formwork 1 is equipped with a fine adjustment mechanism 100 that allows for fine adjustment of the relative position of the reinforcing parts 20 with respect to the position of the iron pins 50 when the iron pins 50 are fixed. With this configuration, the formwork body 10 can be finely adjusted relative to the iron pins 50 after they have been fixed in place. Therefore, even if the concrete formwork 1 is misaligned when the iron pins 50 are fixed in place, it is easy to correct the misalignment of the concrete formwork 1.

[0035] In this embodiment, the fine adjustment mechanism 100 includes elongated holes 22a and 23a provided in the side portions 22 and 23 of the reinforcing portion 20 that are perpendicular to the formwork surface 12a of the formwork body portion 10, and two wedge members 41 and 42 inserted into the elongated holes 22a and 23a with the iron pin 50 in between. With 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 components identical to those in the first embodiment described above may be denoted by the same reference numerals, and their descriptions may be omitted.

[0037] Figure 5 is a schematic diagram showing the reinforcing portion 20 according to the second embodiment as viewed from the front. Figure 6 is a plan view of Figure 5. In the concrete formwork 1 of the second embodiment, a fine adjustment mechanism 200 is provided instead 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 portion 222 extending downward from the left end of the upper surface portion 221, a rectangular plate-shaped right side 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 portions 222 and 223. The inner box 220 is formed to be slightly smaller than the reinforcing portion 20. The inner box 220 is housed in the reinforcing portion 20 (outer box, first member) which constitutes a box shape. The inner box 220 is housed so as to be movable in the front-rear direction along the box shape of the reinforcing portion 20. The reinforcing portion 20 corresponds to the outer box with respect to the inner box 220. Furthermore, the inner box 220 is prevented from coming off the reinforcing portion 20 by the bent portion 13 (see Figure 1).

[0039] The upper surface 221 and 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 correspond to the outer diameter of the shaft portion 51 of the iron pin 50. In other words, in this embodiment, when the iron pin 50 is passed through the guide pipe 225, the guide pipe 225 is formed to be such that there is no play with the iron pin 50.

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

[0041] The upper surface portion 21 of the reinforcing portion 20 is provided with an elongated pin-through hole 221a that extends in the front-to-back direction, instead of the circular pin-through hole 21a of the first embodiment. The pin-through hole 221a is longer in the front-to-back direction than the pin-through hole 21a. Similarly, the substrate portion 11 is also provided with an elongated pin-through hole 211a extending in the front-to-back direction, instead of the circular pin-through hole 11a of the first embodiment. The pin-through hole 211a is formed to be the same shape as the pin-through hole 221a.

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

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

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

[0045] If the concrete formwork 1 is misaligned from the reference point, the reinforcing section 20, which is the outer box, and the formwork body 10 to which the reinforcing section 20 is fixed are struck with a hammer in the direction that corrects the misalignment. At this time, since the bolts 227 are not fastened to the fastening section 226, the reinforcing section 20 and the inner box 220 are able to move relative to each other, and the inner box 220 is almost integral with the iron pins 50. Therefore, the reinforcing section 20 moves relative to the inner box 220. Thus, the misalignment of the concrete formwork 1 relative to the iron pins 50 can be corrected. After the misalignment is corrected, the bolts 227 are fastened to the fastening section 226, and the reinforcing section 20 and the inner box 220 are fixed together. In other words, the concrete formwork 1 is fixed to the iron pins 50 in a state where the misalignment has been corrected.

[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 well, the formwork body 10 can be finely adjusted relative to the iron pins 50 after the iron pins 50 have been fixed. For this reason, even if a misalignment occurs in the concrete formwork 1 when the iron pins 50 are fixed, it is easy to correct the misalignment of the concrete formwork 1.

[0047] In this embodiment, the fine adjustment mechanism 200 comprises a reinforcing part 20 as a first member and an inner box 220 as a second member. The reinforcing part 20 is fixed to the formwork body 10, and the inner box 220 is fixed to the installation surface G through iron pins 50. The reinforcing part 20 can be finely adjusted relative to the position of the inner box 220, and after the relative positions have been finely adjusted, it is equipped with fastening parts 226 and bolts 227 as fasteners to fix the reinforcing part 20 and the inner box 220. This configuration makes it easier to fix the reinforcing part 20 and the inner box 220 after correcting any misalignment, thus making it easier to fix the concrete formwork 1 in a state where the misalignment has been reliably corrected.

[0048] Furthermore, in this embodiment, the reinforcing part 20 is an outer box, and the inner box 220 is an inner box housed within the reinforcing part 20, which acts as the outer box. With this configuration, a portion of the fine-tuning mechanism 200 can be placed inside the reinforcing section 20, which acts as the outer casing, making it easier to control the overall size.

[0049] [3. Other Embodiments] The above embodiments illustrate one specific example of applying the present invention and do not limit the forms to which the invention is applied.

[0050] In the above embodiment, the fine adjustment mechanisms 100 and 200 were described as being provided only in the reinforcing parts 20 at both the left and right ends. However, they may also be provided in the reinforcing parts 20 other than those at both ends, specifically in the three reinforcing parts 20 in the central part.

[0051] In the above embodiment, a configuration was described in which five reinforcing parts 20 are provided in the concrete formwork 1, but the present invention can also be applied to a configuration in which two or more reinforcing parts 20 are provided.

[0052] In the second embodiment described above, a rectangular tubular structure was exemplified for the inner box 220, but it is not limited to this. For example, the inner box 220 may be a rectangular tubular shape with one side open to the bottom, or a rectangular parallelepiped shape with its front end closed. In other words, the inner box 220 can be any shape as long as sufficient strength is ensured and it can move in the front-rear direction within the box shape of the reinforcing part 20.

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

[0054] In the second embodiment described above, the elongated hole 22a through which the bolt 227 passes was the same as the elongated hole 22a in the first embodiment. However, the elongated hole through which the bolt 227 passes may be formed to match the amount of movement of the inner box 220 in the front-rear direction. In other words, instead of the elongated hole 22a in the first embodiment, an elongated hole of a different size may be used. [Explanation of Symbols]

[0055] 1. Concrete formwork 10 Formwork main body (formwork body) 12a Formwork surface 12b Inner surface (opposite side) 20. Reinforcement section (outer box, first component, iron pin insertion section) 22 Side surface (surface where the iron pin is inserted) 22a long hole 23 Side view (surface where the iron pin is inserted) 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 Bolt (fastener) G Installation surface

Claims

1. A concrete formwork comprising a formwork body and a plurality of box-shaped iron pin insertion parts fixed to the surface of the formwork body opposite to the formwork surface, wherein iron pins are passed through the iron pin insertion parts and the formwork body is fixed to the installation surface by the iron pins, When the iron pin is fixed, the system is equipped with a fine adjustment mechanism that allows for fine adjustment of the relative position of the iron pin insertion portion with respect to the position of the iron pin. Concrete formwork.

2. The aforementioned fine adjustment mechanism is The surface of the iron pin insertion portion, which is a long hole provided on a surface perpendicular to the formwork surface of the formwork body, Two wedge members are inserted into the aforementioned elongated hole with the iron pin in between, Equipped with, The concrete formwork according to claim 1.

3. The aforementioned fine adjustment mechanism is The iron pin insertion portion comprises a first member and a second member, The first member is fixed to the formwork body, The second member is fixed to the mounting surface through the iron pin, The first member is capable of finely adjusting its relative position with respect to the position of the second member, and is equipped with a fixing device for fixing the first member and the second member after the relative position has been finely adjusted. The concrete formwork according to claim 1.

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

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