JP3193873U - Concrete formwork fixing device - Google Patents

Abstract

An object of the present invention is to provide a mold fixing device excellent in operability and efficiency for preventing floating of a form due to the pressure of ready concrete filled in a concrete form in concrete retaining wall construction. A locking tool capable of locking a movable traction bolt 3 having a shaft 8 into which a nut 4 can be fitted and a head 9 capable of locking a chain or the like to a formwork. 6, the inner surface provided in the traction tool main body 2 is passed through a smooth through hole, the nut 4 is fitted to the thread 10 of the protruding shaft portion 8, and the movable traction bolt 3 penetrates as the nut 4 rotates. The formwork traction tool 1 is capable of moving forward and backward through the hole. For fasteners to be used at the same time, a fixed bolt having a threaded shaft and a head that can lock a chain, etc. is passed through a through hole with a smooth inner surface provided in the spacer, and a protruding shaft The portion was used by being fitted and fixed in a screw hole provided in a fastener body having a projected area in the vertical direction larger than that of the spacer. [Selection] Figure 1

Description

  The present invention relates to a concrete formwork fixing device for fixing a concrete formwork used for concrete retaining wall construction.

  In the construction site of the concrete retaining wall, the formwork panels are installed so as to face each other along the front and back of the concrete retaining wall according to the shape of the concrete retaining wall to be constructed.

  In this case, in general, in order to fix the form panel so as not to be distorted or bulge, and to ensure the strength of the entire concrete formwork, the vertical support members are vertically spaced along the outer surface of the formwork panel. Is installed. Further, the entire concrete formwork is assembled by installing a horizontal support member on the vertical support member horizontally and at equal intervals so as to intersect the vertical support member.

  In assembling concrete formwork using this formwork panel, vertical support member, and horizontal support member, depending on the shape of the concrete retaining wall to be constructed, the formwork panel may be installed vertically or have a slope. It can be installed in various ways.

  Thereafter, the concrete retaining wall is constructed by pouring and filling the ready-mixed concrete into the assembled concrete formwork, further curing and hardening the ready-mixed concrete, and then removing the concrete formwork.

  In filling the ready-mixed concrete, in order to spread the ready-mixed concrete evenly to the corners of the concrete mold without any gaps, the vibrator is compacted by applying vibration to the ready-mixed concrete in the concrete mold. In this case, due to the weight and pressure of the ready-mixed concrete, a force that pushes and spreads the concrete formwork in the horizontal direction works.

  In particular, in the case of a concrete formwork that is assembled with an inclination on the formwork panel and the internal volume of the lower part is large, the weight of the ready-mixed concrete is concentrated in the lower part of the concrete formwork. . For this reason, not only the force to push the concrete formwork in the horizontal direction but also the upward force to lift the concrete formwork strongly acts.

  In order to maintain the shape of the concrete formwork against horizontal forces and hold both formwork panels at appropriate intervals so that the front and back formwork panels do not distort or bulge, multiple separators Is generally passed through both the formwork panels, and both ends of each separator are fixed with formwork holding cones.

  And for the upward lifting of concrete formwork, there is a method to prevent the lifting by fixing the concrete formwork to the anchor installed on the foundation concrete under the concrete formwork by using a chain or wire. It is common.

  In this case, to secure the concrete formwork, the chain is tensioned and pulled. As a means, a turnbuckle is interposed between the chain connected to the anchor and the chain connected to the concrete formwork. In the past, methods have been used to pull both chains by tightening the turnbuckle to prevent lifting.

  And as for the fixation of the concrete formwork using this turnbuckle, the fasteners and hooks as in Patent Document 1 and Patent Document 2, and the construction method using them have been proposed as conventional improvement measures. It is coming.

  However, in the conventional anti-floating prevention measures for the concrete formwork including the methods of Patent Document 1 and Patent Document 2, the method for hanging the chain on the concrete formwork, the operation of the turnbuckle for pulling the chain, etc. Some skill was required for the workers.

  In particular, the turnbuckle tightening work is mainly performed manually without using a power tool, so that it is not always sufficient in terms of the operability of unskilled workers and the efficiency of work even for skilled workers. The improvement was awaited.

  In addition, in the social capital restoration projects such as seawalls that were damaged by the 2011 Tohoku Pacific Ocean Earthquake, more rapid and reliable work execution is required than ever, and work operability and work beyond conventional technologies are required. It is in the situation where the formwork work of the concrete retaining wall with excellent efficiency is required

JP-A-8-303001 JP 2002-327544 A

  The problem to be solved by the present invention is to improve the operability and low efficiency of the prior art. In the prior art including Patent Document 1 and Patent Document 2, the concrete formwork is pulled to the ground side by a chain or the like in order to fix the concrete formwork so as not to rise. A turnbuckle is used to pull the chain and the like, and the turnbuckle tightening operation is performed manually, and requires habituation and effort.

  With regard to the technique of Patent Document 1, a metal fitting (FIGS. 3 and 4 of Patent Document 1) that can be easily hung on a formwork panel or a lateral support member of a concrete mold is used to improve workability. However, in the point which pulls a chain etc. by operation of a turnbuckle and fixes a concrete formwork, it is no different from the past.

  As for the technique of Patent Document 2, the clasp (Fig. 3 of Patent Document 2) has been devised to improve its ease of installation and the technique of Patent Document 1 has been improved. A chain or the like is hung on a hanging bracket and a fastener via a buckle, and the chain or the like is pulled by operating a turnbuckle.

  In both cases, the operation of the turnbuckle is usually performed manually, and when the turnbuckle is operated after the hanging bracket is hung on the formwork panel or the horizontal support member, the work posture is changed. Operational efficiency and efficiency of work remain low, such as large movement of flow lines.

  The shaft of a movable traction bolt, which has a threaded shaft that can be fitted with a nut and a head that can lock a chain, wire, and rope (hereinafter referred to as traction material), is engaged with a concrete formwork. The inner surface provided on the main body of the traction tool that has a lockable stopper is passed through the smooth through hole of the movable traction bolt, and the nut is fitted to the protruding thread of the shaft. A concrete formwork towing tool that allows the movable tow bolt to move forward and backward through the through hole of the movable tow bolt.

  Also, for the fasteners used simultaneously with the concrete formwork traction tool, the inner surface provided on the spacer has a shaft part of a fixing bolt having a threaded shaft part and a head part capable of locking the traction material. The shaft portion that protruded through the smooth fixing bolt through-hole and was fitted and fixed to the screw hole provided in the fastener body having a larger vertical projection area when the fastener was installed than the spacer was used.

  The present invention greatly improves the operability and efficiency related to the fixing work of the concrete formwork by eliminating the need for a turnbuckle used for towing a chain or the like. Since the forward / backward movement of the screw is used for the pulling operation of the chain or the like, an impact wrench and an electric tool can be used for the rotation operation of the nut. Therefore, the greatest advantage is that even a skilled worker as well as an unskilled worker can safely and easily perform a quick work.

  Further, in the present invention, the locking tool for hanging the concrete formwork traction tool on the concrete formwork and the main body for rotating the nut are integrated. This is because the work of attaching the concrete formwork towing tool to the concrete formwork and the towing work of the chain etc. can be performed continuously at one place at hand, so there is no need to move unnecessary work points. Contributes to improved operability and efficiency.

  As for the fastener, in the usual case, it is necessary to cut the anchor after removing the concrete formwork and perform post-processing so that the cut portion does not remain on the surface of the foundation concrete. In the case of the fastener of the present invention, the spacer and the fixing bolt can be easily removed, and the remaining recess can be easily and quickly post-processed by filling the putty.

It is a perspective view of a concrete formwork traction tool in which the shape of the locking tool is adapted to a square pipe. It is a side view of the concrete formwork traction tool of FIG. A broken line is a cross section of the lateral support member (square pipe) of the concrete formwork. It is a combination perspective view of a fastener. It is sectional drawing which shows the use condition of the fastener of FIG. It is a perspective view which shows the use condition of a concrete formwork traction tool and a fastener. It is a side view of a formwork traction tool in which the shape of the locking tool is adapted to a round pipe. A broken line is a cross section of a horizontal support member (round pipe) of a concrete formwork. It is a combination perspective view of the concrete formwork traction tool (example 1) which can attach and detach a locking tool. It is a combination perspective view of a concrete formwork traction tool (example 2) to which a locking tool can be attached and detached. It is a perspective view of the concrete formwork traction tool which has a plate-shaped latching tool.

  The present invention provides a concrete formwork fixing device in order to prevent the concrete formwork from lifting due to the weight and pressure of the ready-mixed concrete poured into the concrete formwork during the formwork for concrete retaining wall construction. The use of a turnbuckle, which has been widely used for towing a chain for securing a concrete formwork in the prior art, has been made unnecessary. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of a first embodiment of a concrete formwork traction tool of the present invention, and FIG. 2 is a side view of the same embodiment. In addition, FIG. 5 shows a use situation of the concrete formwork towing tool.

  The traction tool main body 2 of the concrete formwork traction tool 1 is provided with a movable traction bolt through-hole 5 having a smooth inner surface so that the screw can be smoothly moved without being caught even by a threaded bolt or the like. ing. Then, two locking tools 6 rising from both sides of the traction tool body 2 so as to be parallel to the movable traction bolt through hole 5 and bent into a shape corresponding to the lateral support member 28 of the concrete mold 25 are formed. is there.

  The shape of the locking tool 6 is suitable for a square pipe 29 that is often used as the lateral support member 28 of the concrete mold 25, and the concrete mold puller 1 can be reliably hung on the lateral support member 28. It is bent in size and shape. In addition, although it changes also with the scale etc. of a concrete retaining wall, the side of the cross section of the generally used square pipe 29 is often 60 mm or 75 mm.

  Further, the movable traction bolt 3 inserted into the movable traction bolt through hole 5 of the traction tool body 2 and freely movable includes a shaft portion 8 and a head 9 on which a traction material 18 such as a chain, a wire, and a rope can be hung. Have A thread 10 is cut in the shaft portion 8 in a range corresponding to the movable range of the movable traction bolt 3. In addition, regarding the head 9, not only a hook shape having a part opened as shown in the figure but also an eyebolt shape having a round shape and a closed shape may be considered.

  In order to use as the concrete formwork traction tool 1, the shaft portion 8 of the movable traction bolt 3 is passed through the movable traction bolt through hole 5 of the traction tool body 2, and the nut 4 is attached to the thread 10 of the protruding shaft portion 8. Fit. Thereby, the movable traction bolt 3 does not fall out of the traction tool body 2.

  In this state, when the nut 4 attached to the screw thread 10 of the shaft portion 8 of the movable traction bolt 3 is rotated, the relative positional relationship between the movable traction bolt 3 and the locking tool 6 is movable due to the forward and backward movement of the screw. It fluctuates within the range of the movable range of the traction bolt 3, that is, within the range of the screw thread 10.

  Since the inner side surface of the movable traction bolt through hole 5 is smooth, even when the nut 4 is rotated, the movable traction bolt 3 that is tensioned by the traction material 18 such as a chain performs unnecessary rotational movement. Without doing so, you will move forward and backward while maintaining stability. The chain hook 7 can be used with a traction material if necessary, but is not an essential component.

  Next, the fastener 19 of FIG. 3 has a fixing bolt 22 for locking the traction member 18, a fastener body 20 for fitting and fixing the fixing bolt 22, and a spacer 21. The shaft portion of the fixing bolt 22 is threaded 10, and the head 9 that can lock the traction member 18 may have an eyebolt shape in addition to a hook shape that is partially open as shown in the figure. Is possible. The fastener body 20 is provided with a screw hole 24 that fits into the screw thread 10 of the fixing bolt 22. On the other hand, the inner surface of the fixing bolt through hole 23 of the spacer 21 is smooth. When the fastener 19 is used, the fixing bolt 22 is passed through the fixing bolt through hole 23 of the spacer 21, the spacer 21 is sandwiched between the fixing bolt 22 and the fastener base 20, and the screw 10 of the fixing bolt 22 is fastened to the fastening bolt 22. The screw hole 24 of the tool body 20 is fitted and fixed for use.

  The fastener 19 is embedded and used in the foundation concrete 31 as shown in FIG. 4, but the vertical projection area of the fastener body 20 is larger than the vertical projection area of the spacer 21 when the fastener is installed. It is installed without coming out of the concrete 31 easily. And after removing the concrete formwork 25, the fixing bolt 22 and the spacer 21 are removed, and the surface part of the foundation concrete 31 is made into a flat state by filling the remaining hollow.

  Next, the usage method of the concrete formwork traction tool 1 is demonstrated. At the time of construction of the concrete retaining wall, the concrete formwork 25 is assembled by installing the formwork panel 26 so as to face the front and back portions of the concrete retaining wall according to the shape of the concrete retaining wall to be constructed.

  The concrete formwork 25 needs to be strong so that it can withstand the weight and pressure of the ready-mixed concrete to be poured and filled. Usually, the formwork panel 26 is provided by vertical support members 27 arranged at equal intervals on the outer surface of the formwork panel 26. Are further reinforced by the lateral support members 28 arranged at equal intervals on the vertical support members 27, and the concrete mold 25 is completed.

  In this state, the ready-mixed concrete is poured into the concrete formwork 25, and vibrations are applied to the ready-made concrete by a vibrator or the like so as to be distributed to the corners of the concrete formwork 25 at equal density, not unevenly. Will do.

  During this work and between the time when the ready-mixed concrete is poured and hardened, the weight of the ready-mixed concrete is large. Therefore, the concrete mold 25 filled with ready-mixed concrete has a large internal pressure in both the horizontal and vertical directions. Work.

  When the wall of the concrete retaining wall is not vertical but has an inclination, it is necessary to install the formwork panel 26 obliquely. At this time, the weight of the ready-mixed concrete is concentrated in the lower part of the concrete formwork 25. However, a large pressure is generated in the horizontal direction, and an upward pressure for lifting the concrete formwork 25 also acts to cause the concrete formwork 25 to float.

  Since the concrete formwork 25 is lifted up, a gap is generated between the basic concrete 31 at the lower part of the concrete formwork 25 and the concrete formwork 25, so that the ready-mixed concrete leaks out of the concrete formwork 25, There will also be problems with the finish of the retaining wall.

  The following measures will be taken for these important issues that should be managed in the construction of concrete retaining walls. For horizontal pressure, the separator holds the formwork panels 26 that form the front and back of the concrete retaining wall at appropriate intervals, and suppresses lateral displacement, distortion and swelling. And in order to prevent the concrete formwork 25 from moving upward, that is, lifting, the concrete formwork traction tool 1 of the present invention is used.

  First, as shown in FIG. 5, a traction member 18 such as a chain is hung on the fastener 19 installed on the foundation concrete 31, and the other end of the traction member 18 is hung on the movable traction bolt 3 of the concrete formwork traction tool 1. Next, the locking tool 6 of the concrete mold puller 1 is hung on the lateral support member 28 of the concrete mold 25. In this state, when the nut 4 fitted to the movable traction bolt 3 of the concrete formwork traction tool 1 is rotated by an electric tool or the like, the movable traction bolt 3 is moved by the forward and backward movement of the screw, and the traction material 18 is moved. The force which pulls and pulls the concrete formwork 25 downward downward will work.

  Conventionally, a turnbuckle has been used for towing the towing material 18. In the case of the turnbuckle, when the main body is rotated, the hook bolt and the eyebolt are moved by the forward and backward movement of the right and left screws provided at both ends of the main body, and the traction member 18 is pulled. Usually, the work of rotating the main body of the turnbuckle is performed manually using a spanner or the like.

  In the concrete formwork towing tool 1 of the present invention, the towing material 18 is towed by utilizing the forward and backward movement of the screw by the thread 10 and the nut 4 of the movable tow bolt 3 so that an electric tool can be used. did. Therefore, the greatest advantage is that even a skilled worker as well as an unskilled worker can safely and easily perform a quick work.

  Moreover, in this invention, the latching tool 6 and the traction tool main body 2 which inserted the movable traction bolt 3 are integrated. As a result, the operator hangs the locking tool 6 of the concrete formwork traction tool 1 on the lateral support member 28 in a state where the traction material 18 is hung on the movable traction bolt 3, and the nut 4 is quickly changed with little change in the work posture. It is possible to shift to the rotation operation. As in the conventional technology, after installing the hanging bracket, it also contributes to the improvement of operability and efficiency in that it does not involve the movement of unnecessary work points such as changing the posture and operating the turnbuckle. ing.

  In the same manner, the fastener 19 and the concrete mold 25 are fixed by the traction material 18 by using the concrete formwork traction tool 1 of the present invention at an equal interval such as 1 m. Through the above series of operations, the concrete mold 25 that receives the weight and pressure of the ready-mixed concrete and tends to float upward is pulled downward via the concrete mold puller 1 of the present invention. The mold frame 25 is reliably prevented from being lifted up and held at an appropriate position.

  FIG. 6 is a side view of the concrete form traction tool 1 according to the second embodiment of the present invention, in which the shape of the locking tool 6 is round. In addition to the square pipe 29 as shown in FIG. 2, a round pipe 30 is often used as the lateral support member 28 of the concrete mold 25. In this case, a so-called “single tube” is often used, but its cross-sectional diameter is 48.6 mm according to Japanese Industrial Standards. In addition, the configuration of each part of the concrete formwork traction tool 1 is the first implementation except that the shape of the locking tool 6 is round so that the concrete formwork traction tool 1 is surely hooked on the round pipe 30. It is the same as the form.

  Note that the concrete formwork traction tool 1 of the first and second embodiments both hangs the locking tool 6 on the horizontal support member 28 of the concrete formwork 25, that is, the square pipe 29 or the round pipe 30. However, it is also possible to hang the latching tool 6 on the upper end portion of the formwork panel 26 and to adopt a shape suitable for it, for example, a shape suitable for a plate instead of a pipe.

  In the above embodiment, the shape of each locking tool 6 is different from that of a square or a round shape, and the concrete formwork traction having the matching locking tool 6 according to the cross-sectional shape of the lateral support member 28. The tool 1 is appropriately selected and used. However, as another embodiment, a concrete formwork traction tool 1 in which the locking tool 6 is removable is also conceivable.

  FIG. 7 is a perspective view showing a first example of the concrete formwork traction tool 1 having the detachable locking tool 11. In addition to the movable traction bolt through hole for allowing the movable traction bolt 3 to penetrate, the traction tool main body 2 is provided with a locking tool insertion hole 12 for inserting the detachable locking tool 11.

  Further, in order to function as a locking tool fixing device, a fixing pin insertion hole 14 having a size through which the locking tool fixing pin 13 passes is provided in the traction tool main body 2 and the locking tool insertion hole 12 of the detachable locking tool 11 is provided. A fixing pin insertion hole 14 having a size through which the locking tool fixing pin 13 passes is provided at a portion corresponding to the portion to be fitted into the. In use, the locking fixture fixing pin 13 is fitted into the fixing pin insertion hole 14 and the detachable locking fixture 11 is fixed. In addition, although the locking tool fixing pin 13 and the fixing pin insertion hole 14 may be a pair, a plurality of locking tools 11 may be provided to prevent the removable locking tool 11 from coming off and to improve stability.

  When using the concrete formwork traction tool 1, the detachable locking tool 11 suitable for the shape of the square pipe 29, the round pipe 30 or the formwork panel 26 upper end according to the shape of the lateral support member 28 is selected. Then, it is inserted into the locking tool insertion hole 12 of the traction tool body 2 and fixed with a locking tool fixing pin 13 for preventing dropping and improving stability, and the detachable locking tool 11 and the traction tool body 2 are connected. It will be used as a unit.

  In addition, the attachment / detachment method of the detachable locking tool 11 and the locking tool fixing device (measures for preventing dropout and improving stability) are not limited to the method of FIG. For example, FIG. 8 is a second example. A connecting rod 15 is provided at a site where the detachable locking tool 11 is inserted into the traction tool body 2, and the traction tool body 2 has a structure that can be divided or partially opened by a hinge or the like. 2 is provided with a fitting groove 16 having a shape in which a part of the detachable latch 11 and the connecting rod 15 are fitted.

  In use, after the detachable locking tool 11 is fitted in the fitting groove 16, the detachable locking tool 11 is closed with the detachable locking tool 11 sandwiched between the separated or opened traction tool body 2 and is not easily divided or opened. Thus, the traction tool main body 2 is fixed by the buckle 17, and the detachable locking tool 11 and the traction tool main body 2 are integrated and used.

  Furthermore, as another embodiment, the concrete form traction tool 1 in which a traction material 18 such as a chain or a wire is connected to the head 9 of the movable traction bolt 3 may be considered.

  Moreover, the shape of the locking tool 6 in the description so far has assumed two bent bar-like shapes. However, if the concrete formwork traction tool 1 is securely attached to the formwork panel 26 or the lateral support member 28 and can withstand the traction of the traction material 18, the shape of the locking tool 6 as shown in FIG. 9. It is good also as one plate-like thing, and also it can also be considered as various shapes which elaborated the design.

  Except for the concrete formwork traction tool 1 having the detachable locking tool 11, the locking tool 6 and the traction tool body 2 can be formed separately and welded to form them, or they can be integrally formed. Therefore, the method for manufacturing the concrete formwork traction tool 1 of the present invention is not limited to one.

  Moreover, although the fastener main body 20 and the fixing bolt 22 of the concrete form tow tool 1 and the fastener 19 are assumed to be made of metal such as steel from the viewpoint of strength and cost, they have strength that can withstand towing. If so, it may be made of reinforced resin or the like. On the other hand, the spacer 21 may be made of plastic or rubber so that it can be easily removed.

DESCRIPTION OF SYMBOLS 1 Concrete formwork tow tool 2 Tow tool main body 3 Movable tow bolt 4 Nut 5 Movable tow bolt through hole 6 Locking tool 7 Chain hook 8 Shaft part 9 Head 10 Screw thread 11 Removable lock tool 12 Locking tool insertion hole 13 Locking Pin Fixing Pin 14 Fixing Pin Inserting Hole 15 Connecting Rod 16 Fitting Groove 17 Buckle 18 Pulling Material 19 Fastening 20 Fastening Body
21 Spacer 22 Fixing bolt 23 Fixing bolt through hole 24 Screw hole 25 Concrete formwork 26 Formwork panel 27 Vertical support member 28 Horizontal support member 29 Square pipe 30 Round pipe 31 Basic concrete

In this case, to secure the concrete formwork, the chain is tensioned and pulled. As a means, a turnbuckle is interposed between the chain connected to the anchor and the chain connected to the concrete formwork. In the past, a method of pulling both chains by tightening the turnbuckle to prevent lifting is used.

A movable traction bolt having a threaded shaft portion that can be fitted with a nut, and a head portion that can lock a chain wire rope ( hereinafter referred to as “utility model registration claim” and “towing material” in the following ). The shaft part is passed through a through hole that has a smooth inner surface provided on the main body of the traction tool that has a locking tool that can be locked to the concrete formwork, and a nut is fitted to the thread of the protruding shaft part. A concrete formwork traction tool in which the movable traction bolt moves back and forth through the through hole of the movable traction bolt by a screw motion accompanying the rotation of the nut.

The shape of the locking tool 6 is suitable for a square pipe 29 that is often used as the lateral support member 28 of the concrete mold 25, and the concrete mold puller 1 can be reliably hung on the lateral support member 28. It is bent in size and shape. Note that, depending on the scale of the concrete retaining wall, etc., one side of the cross section of the generally used square pipe 29 is often 60 mm or 75 mm .

Further, the movable traction bolt 3 inserted into the movable traction bolt through hole 5 of the traction tool main body 2 and freely moving includes a shaft portion 8, It has a head 9 on which a traction material 18 can be hung. A thread 10 is cut in the shaft portion 8 in a range corresponding to the movable range of the movable traction bolt 3. In addition, regarding the head 9, not only a hook shape having a part opened as shown in the figure but also an eyebolt shape having a round shape and a closed shape may be considered.

And since the inner surface of the movable tow bolt through hole 5 is smooth, even when the nut 4 is rotated, The movable traction bolt 3 that is tensioned by the traction material 18 does not perform unnecessary rotational movement, but performs forward and backward movement while maintaining stability. The chain hook 7 can be used with a traction material if necessary, but is not an essential component.

First, as shown in FIG. The traction material 18 is hung, and the other end of the traction material 18 is hung on the movable traction bolt 3 of the concrete formwork traction tool 1. Next, the locking tool 6 of the concrete mold puller 1 is hung on the lateral support member 28 of the concrete mold 25. In this state, when the nut 4 fitted to the movable traction bolt 3 of the concrete formwork traction tool 1 is rotated by an electric tool or the like, the movable traction bolt 3 is moved by the forward and backward movement of the screw, and the traction material 18 is moved. The force which pulls and pulls the concrete formwork 25 downward downward will work.

Further, in order to function as a locking tool fixing device, a fixing pin insertion hole 14 having a size through which the locking tool fixing pin 13 passes is provided in the traction tool main body 2 and the locking tool insertion hole 12 of the detachable locking tool 11 is provided. A fixing pin insertion hole 14 having a size through which the locking tool fixing pin 13 passes is provided at a portion corresponding to the portion to be fitted into the. In use, the locking fixture fixing pin 13 is fitted into the fixing pin insertion hole 14 and the detachable locking fixture 11 is fixed. In addition, although the combination of the locking tool fixing pin 13 and the fixing pin insertion hole 14 may be one , it is also possible to provide a plurality in order to prevent the removable locking tool 11 from coming off and to improve the stability.

When using the concrete formwork pulling tool 1, the detachable locking tool 11 suitable for the shape of the upper end portion of the lateral support member 28 (square pipe 29 or round pipe 30) or the formwork panel 26 is selected and pulled. It is inserted into the locking tool insertion hole 12 of the tool body 2 and fixed with a locking tool fixing pin 13 for preventing dropping and improving stability, and the removable locking tool 11 and the traction tool body 2 are integrated. Will be used.

Furthermore, as another embodiment, on the head 9 of the movable tow bolt 3, It is also conceivable to use the concrete formwork traction tool 1 to which the traction material 18 is connected.

Claims (7)

  Traction tool main body having a locking tool capable of locking a shaft part of a movable traction bolt having a threaded shaft part capable of fitting a nut and a head part capable of locking a traction material to a concrete formwork The inner side surface provided in is penetrated through the smooth movable traction bolt through hole, the nut is fitted to the protruding thread of the shaft, and the movable traction bolt penetrates the movable traction bolt through hole by the screw movement accompanying the rotation of the nut. Concrete formwork towing tool that can move forward and backward.   The concrete formwork traction tool according to claim 1, wherein the locking tool has a shape suitable for a square pipe.   The concrete formwork traction tool according to claim 1, wherein the locking tool has a shape suitable for a round pipe.   The concrete formwork towing tool according to any one of claims 1 to 3, wherein the concrete form towing tool is provided with a locking tool fixing device, and a detachable locking tool is fitted and fixed to the traction tool main body.   The concrete formwork traction tool according to claim 1, wherein the movable traction bolt is provided with a traction material.   The shaft part of the fixing bolt, which has a threaded shaft part and a head part that can lock the traction material, is passed through the fixing bolt through hole with a smooth inner surface provided in the spacer, and the protruding shaft part is A fastener used by fitting and fixing to a screw hole provided in a fastener body having a projected area in the vertical direction larger than the spacer when the fastener is installed.   A concrete formwork fixing device comprising a pulling material, the fastener according to claim 6, and the concrete formwork towing tool according to claim 1.