JP4293445B2 - Deformation prevention member for wiring box - Google Patents

Description

  The present invention relates to a deformation prevention member for a wiring box used when the wiring box is drawn to a concrete formwork.

  Conventionally, when a wiring box is embedded in a concrete wall, before placing the concrete, the wiring box is fixed to the inside of the mold so that its open end is in close contact with the inner surface of the mold. In order to fix the wiring box to the inside of the mold, a bolt body is inserted into the wiring box from a through hole formed in the mold, and one end of the bolt body is connected to a screw portion provided at the bottom of the wiring box. Screw together. Thereafter, the nut box is screwed to the other end of the bolt body projecting outside the mold frame, whereby the wiring box is drawn to the mold frame. As a result, the wiring box is fixed in a state where the opening end is in close contact with the inner surface of the mold.

  When pulling the wiring box toward the formwork, a pair of projecting rods are integrally formed on the bottom of the wiring box to prevent the bottom part around the threaded part from being pulled into the wiring box and bending. (For example, refer to Patent Document 1). The said extending | stretching bar is extended toward the opening from the bottom part which opposes on both sides of a thread part. When the nut body is screwed onto the bolt body and the wiring box is drawn to the formwork, the free ends of both projecting bars abut against the inner surface of the formwork, and both projecting bars cause the bottom and the formwork Spacing is maintained.

As a result, the bottom bar prevents the bottom portion from being drawn into the wiring box, and prevents the bottom portion from being bent. After the concrete is cast and the formwork is removed, these strut bars are broken off from the base end portion and removed from the wiring box. In addition, a concave portion is provided on the outer surface of the bottom portion near the base end portion of the strut rod so that the strut rod can be easily removed.
No. 5-10500

  However, the tension rod is provided at only two locations around the threaded portion. For this reason, the stress generated around the threaded portion as the wiring box is pulled is received only by the pair of projecting bars. When the stress concentrates on the pair of projecting rods, the projecting rods are bent, and there is a problem that it is impossible to prevent deformation of the wiring box including the bottom. The present invention has been made paying attention to such problems existing in the prior art, and its purpose is to prevent the wiring box from being deformed when the wiring box is attracted and fixed to the concrete formwork. An object of the present invention is to provide a deformation preventing member for a wiring box that can be prevented.

In order to solve the above-described problems, the invention according to claim 1 is characterized in that a bolt that penetrates a concrete mold and is inserted into a wiring box inside the concrete mold is screwed into a screw portion at the bottom of the wiring box. The wiring box is attached to the wiring box to prevent the wiring box from being deformed when the wiring box is drawn to the concrete formwork, and is provided with a deformation preventing member for the wiring box provided separately from the wiring box. A cylindrical main body through which the bolt penetrates, and the main body includes a first abutting portion which surrounds the threaded portion at one end of the main body along the penetrating direction of the bolt and abuts against the bottom portion in a non-rotatable manner. And the same plane as the opening surface of the wiring box or the opening surface of the box cover attached to the wiring box with the first contact portion in contact with the bottom at the other end of the main body along the penetrating direction Providing the second contact portion capable of contacting positions to the concrete form to the gist of the.

  The invention according to claim 2 is the deformation prevention member for a wiring box according to claim 1, wherein the main body includes an attachment portion for attaching the main body to the bottom of the wiring box on one end side of the main body. And

  According to a third aspect of the present invention, in the deformation prevention member for a wiring box according to the first or second aspect, the main body is a main body along the penetration direction in order to guide the bolt to the screw portion. The gist of the present invention is to provide a guide hole having a diameter reduced from the other end side toward the one end side.

The gist of the invention described in claim 4 is that, in the deformation prevention member for a wiring box according to claim 3, the guide surface for forming the guide hole is formed in a funnel-shaped surface shape.
The invention according to claim 5 is the deformation prevention member for a wiring box according to any one of claims 1 to 4, wherein a connecting member is attached to the other end side of the main body, and the connecting member is The gist is that the other end is located on the same plane as the opening surface of the wiring box or the opening surface of the box cover with one end side attached to the other end side of the main body.

  ADVANTAGE OF THE INVENTION According to this invention, when a wiring box is pulled near and fixed to a concrete formwork, it can prevent that a wiring box deform | transforms.

  Hereinafter, an embodiment of a deformation prevention member for a wiring box embodying the present invention will be described with reference to FIGS. First, the wiring box will be described. As shown in FIGS. 1 and 2, the wiring box 11 includes a bottomed square box having an opening on one side from a bottom part 12 having a square plate shape and side walls 13 erected on the four side periphery of the bottom part 12. It is formed in a shape. At the center of the bottom 12 of the wiring box 11, a bulging portion 14 that swells cylindrically into the wiring box 11 is provided. A nut N (see FIG. 6) is embedded in the bulging portion 14, and a screw portion is provided in the wiring box 11 by the nut N. Then, the bolt B can be inserted into the nut N from the screw hole 14a drilled in the center of the bulging portion 14. Moreover, the bottom part 12 is equipped with the protrusion 15 in four places so that the edge part center and the bulging part 14 by the side of the bottom part 12 of each side wall 13 may be connected. Each protrusion 15 is formed so as to extend linearly. Further, each of the protrusions 15 as a part of the bottom portion 12 is provided with an engagement recess 16 having a circular hole shape in one or two places.

  Next, a deformation prevention member for a wiring box (hereinafter simply referred to as a deformation prevention member) 20 will be described. As shown in FIG. 1, the deformation preventing member 20 deforms the bottom 12 of the wiring box 11 when the wiring box 11 is drawn to a concrete formwork (hereinafter simply referred to as “formwork”) 18. In order to prevent this, it is attached to the wiring box 11. As shown in FIGS. 3 and 4, the deformation preventing member 20 is entirely formed of a synthetic resin material. The deformation preventing member 20 has a cylindrical main body 21, and the main body 21 is formed so that the bolt B can be passed through the inner side thereof. The direction in which the bolt B penetrates the main body 21 is defined as the penetration direction. The main body 21 includes a covering portion 22 formed in a substantially cylindrical shape capable of covering the bulging portion 14 at one end thereof. Further, the main body 21 includes a guide portion 23 having a conical cylindrical shape whose diameter is reduced toward the covering portion 22 at a portion other than the covering portion 22.

  As shown in FIG. 4, the covering portion 22 is formed so that the inner diameter of the peripheral wall 22 d is slightly larger than the diameter of the bulging portion 14. The covering portion 22 is formed so as to be recessed from the end surface 22e to the back of the covering portion 22. An insertion hole 22 a through which the bolt B can pass is formed in the center portion in the covering portion 22. The diameter of the insertion hole 22a is slightly larger than the diameter of the bolt B. On the peripheral wall 22d, concave grooves 22b are formed at four locations at equal intervals in the circumferential direction of the peripheral wall 22d. Furthermore, a pair of engaging protrusions 22c are formed on the outer surface of the peripheral wall 22d so as to face each other. Both engaging protrusions 22c are formed to be engageable with the engaging recess 16, respectively. The main body 21 is attached to the bottom 12 by engaging the engaging protrusion 22 c with the engaging recess 16. That is, the engagement protrusion 22c constitutes an attachment portion for attaching the main body 21 to the bottom portion 12 (wiring box 11), and the deformation preventing member 20 is prevented from being detached from the bottom portion 12 by this attachment portion (engagement protrusion 22c). It has become.

  As shown in FIGS. 5 and 6, when the bulging portion 14 is covered by the covering portion 22 and the deformation preventing member 20 is attached to the bottom portion 12 by the engaging protrusion 22c, the inside of each concave groove 22b is The ridge 15 is accommodated. At this time, the inner surface of the concave groove 22b comes into contact with the protrusion 15 which is a part of the bottom portion 12, the end surface 22e of the peripheral wall 22d comes into contact with the bottom portion 12, and the front end of the engagement protrusion 22c is also a part of the bottom portion 12. It contacts the inner bottom surface of the recess 16. That is, the end surface 22e of the peripheral wall 22d serving as one end of the main body 21 along the penetrating direction of the bolt B, the inner surface of the concave groove 22b, and the front end of the engaging protrusion 22c surround the bulging portion 14 (screw portion). A first abutting portion that abuts on 12 is configured. Further, when the deformation preventing member 20 is attached to the bottom portion 12, the central axis of the insertion hole 22 a coincides with the central axis of the nut N. Further, when the deformation preventing member 20 is attached to the bottom portion 12, the inner surface of each concave groove 22 b can come into contact with the outer surface of the protrusion 15, and the engaging protrusion 22 c can come into contact with the inner surface of the engaging recess 16. Become. The concave groove 22b and the engaging protrusion 22c constitute a detent means for preventing the deformation preventing member 20 from rotating in the circumferential direction.

  Next, the guide part 23 will be described. As shown in FIGS. 3 and 6, a guide hole 23 a is formed inside the guide portion 23. The guide hole 23a is formed so that its diameter decreases from the other end side of the main body 21 along the penetrating direction toward one end side. That is, the guide hole 23a is formed so that the other end side of the main body 21 is opened most widely, and is formed so as to be gradually narrowed toward the insertion hole 22a. The diameter of the guide hole 23a is the largest at the other end of the main body 21 and is larger than the diameter of the bolt B, and approaches the diameter of the bolt B as it approaches the insertion hole 22a.

  Further, the inner peripheral surface of the guide portion 23 that forms the guide hole 23 a is formed so as to incline from the other end side of the main body 21 along the penetrating direction toward the one end side, and is formed by the inner peripheral surface of the guide portion 23. A guide surface A is formed in the main body 21. Therefore, the guide surface A is formed in a funnel-shaped surface shape centering on the insertion hole 22a.

  Furthermore, the guide surface A is mirror-finished. For this reason, the guide surface A is easier to reflect sunlight or the like than the other peripheral surfaces of the main body 21. On the end surface 23d, which is the other end surface of the main body 21 along the penetrating direction of the bolt B, a positioning projection 23c protrudes at a position opposite to the radial direction of the guide portion 23. In the main body 21, reinforcing ribs 25 are formed at four locations at equal intervals in the circumferential direction of the main body 21 so as to connect the covering portion 22 and the guide portion 23.

  In the state where the bulging portion 14 is covered by the covering portion 22 and the inner surface of the concave groove 22b, the end surface 22e of the peripheral wall 22d, and the tip of the engaging protrusion 22c are in contact with the bottom portion 12, the end surface 23d of the guide portion 23 is used. Is positioned at the same height as the end face of each side wall 13 of the wiring box 11. Here, a plane on which the end surfaces of all the side walls 13 are located is defined as an opening surface H of the wiring box 11. An end surface 23 d of the guide portion 23 is located on the opening surface H, and the end surface 23 d constitutes a second contact portion of the main body 21. It should be noted that the end surface 23d is positioned on the opening surface H is a state where the end surface 23d coincides with the opening surface H, and the end surface 23d slightly protrudes forward from the opening surface H or slightly retracts backward. Including state. That is, when the wiring box 11 is pulled toward the mold 18, it does not prevent the open end of the wiring box 11 from being in close contact with the inner surface of the mold 18 installed on the pulling side of the wiring box 11. Any position of the end face 23d may be used.

  Next, a method of fixing the wiring box 11 to the mold 18 using the deformation preventing member 20 having the above configuration will be described with reference to FIGS. It is assumed that a mold 18 is provided in front of and behind the wiring box 11 and the wiring box 11 is supported inside the pair of molds 18 by support means (not shown). 5 and 6 show only one mold 18 disposed on the front side (opening side) of the wiring box 11.

  First, in a state where the wiring box 11 is supported by the support means, the bulging portion 14 is covered with the covering portion 22, and the engaging protrusion 22 c is engaged with the engaging recess 16. That is, the deformation preventing member 20 is attached to the bottom 12 of the wiring box 11 by the attaching portion. Further, the inner surface of each concave groove 22b is brought into contact with the protrusion 15, and the end surface 22e of the peripheral wall 22d (the inner surface of the concave groove 22b) and the tip of the engaging protrusion 22c are brought into contact with the bottom portion 12. At this time, the end surface (second contact portion) 23 d of the guide portion 23 is positioned on the opening side of the wiring box 11 and is positioned on the same plane as the opening surface H. Further, the deformation preventing member 20 is moved on the bottom 12 without moving in the circumferential direction by the engagement of the pair of engagement recesses 16 and the pair of engagement protrusions 22c and the contact of the groove 22b and the protrusion 15 with each other. Positioned.

  Next, as shown in FIG. 6, a through hole 18 a is formed in the mold 18. The through hole 18a is formed to be slightly larger than the diameter of the bolt B so that the bolt B can be inserted. And the position of the wiring box 11 installed in the inner side of the formwork 18 from the through-hole 18a is confirmed. At this time, since the guide surface A of the guide portion 23 is mirror-finished, sunlight or the like that has entered the guide portion 23 from between the mold 18 and the end surface 23d is reflected on the guide surface A. With this reflected light, the operator can confirm the position of the deformation preventing member 20.

  Subsequently, while confirming the position of the guide hole 23 a by reflected light from the guide surface A, the bolt B is inserted into the through hole 18 a, and further, the bolt B is inserted into the guide hole 23 a of the guide portion 23. At this time, the guide hole 23a is widest at the other end of the main body 21 and is wider than the through hole 18a. For this reason, the volt | bolt B inserted in the through-hole 18a can be easily inserted in the guide hole 23a. When the bolt B inserted into the guide hole 23a contacts the guide surface A, the bolt B is promptly guided to the insertion hole 22a by the funnel-shaped guide surface A. Further, the insertion hole 22a is located directly above the nut N and has a diameter slightly larger than that of the bolt B. For this reason, when the bolt B is guided and inserted into the insertion hole 22a by the guide surface A, the bolt B is guided so as to pass through the main body 21 and to be inserted into the nut N from the insertion hole 22a. Therefore, the deformation prevention member 20 for a wiring box of the present invention is used as a wiring box guide member for guiding the bolt B inserted into the main body 21 from the other end of the main body 21 to the nut N (threaded portion). Is also possible.

  Subsequently, one end of the bolt B is screwed into the nut N of the bottom 12 of the wiring box 11. Subsequently, the nut body 30 is screwed into the other end of the bolt B extending to the outside of the mold 18. Then, as the nut body 30 is screwed, the wiring box 11 is drawn toward the mold 18. When the positioning protrusion 23c bites into the inner surface of the mold 18, the wiring box 11 is restricted from being rotated when the nut body 30 is screwed into the bolt B.

  Furthermore, since the open end of the wiring box 11 is in contact with the inner surface of the mold 18, the periphery of the nut N is drawn toward the mold 18. When the periphery of the nut N is pulled toward the mold 18, stress that is pulled toward the mold 18 acts on the bulging portion 14 positioned around the nut N. However, around the bulging portion 14 in the bottom portion 12, the inner surface of the concave groove 22 b, the end surface 22 e of the peripheral wall 22 d, and the engaging protrusion 22 c, which are the first contact portions of the deformation preventing member 20, contact the bottom portion 12. The mold 18 is in contact with the end face 23d of the guide portion 23 which is the second contact portion of the deformation preventing member 20.

  In particular, the deformation preventing member 20 has a cylindrical shape, the first contact portion is in contact with the bottom portion 12 so as to surround the bulging portion 14, and the second contact portion is also in contact with the concrete mold 18. For this reason, the stress which generate | occur | produces in the bulging part 14 and its periphery will be received by the whole deformation | transformation prevention member 20 as it is. That is, the area for receiving the stress is larger than when the stress is received by only two struts, and the stress is evenly distributed and received by the deformation preventing member 20. be able to. Further, since the deformation preventing member 20 has a cylindrical shape, it is difficult to dig up compared to the case where stress is received by a rod-shaped projecting rod. As a result, even if the periphery of the nut N is drawn toward the mold 18 and the stress is generated, the space between the mold 18 and the bottom 12 can be maintained by the deformation preventing member 20, and the bulging portion 14 It is possible to prevent deformation of the bottom portion 12 and the side wall 13 around the bottom portion 12. When the nut body 30 is screwed to the bolt B, the wiring box 11 is fixed to the inside of the mold 18 with the end faces (open ends) of the side walls 13 of the wiring box 11 being in close contact with the inner surface of the mold 18. Is done.

  Thereafter, concrete is placed between the molds 18 to embed the wiring box 11 in the concrete wall. After the mold 18 is removed, the deformation preventing member 20 is removed from the wiring box 11. At this time, the deformation preventing member 20 is easily removed from the wiring box 11 because it is positioned in the wiring box 11 only by the engagement between the engagement recess 16 and the engagement protrusion 22c.

According to the above embodiment, the following effects can be obtained.
(1) The deformation preventing member 20 is formed in a cylindrical shape. Furthermore, when the inner surface of the concave groove 22b, the end surface 22e of the peripheral wall 22d, and the tip of the engaging projection 22c are brought into contact with the bottom 12 around the bulging portion 14, the end surface (second contact portion) 23d is wired. Although it was installed on the drawing side of the box 11, it was formed so as to contact the concrete formwork 18. When the wiring box 11 is drawn toward the mold 18, the stress generated in the bulging portion 14 and its periphery can be evenly distributed and received by the deformation preventing member 20. For this reason, the deformation preventing member 20 does not tilt or deform even when the stress is received, and the deformation preventing member 20 maintains a constant distance between the bottom 12 and the concrete formwork 18 so as to maintain the wiring box 11. It is possible to prevent the side wall 13 and the like from being deformed as well as the bottom portion 12 of the steel plate.

  (2) The deformation preventing member 20 is installed on the bottom portion 12 with the covering portion 22 covering the entire bulging portion 14. For this reason, even if the force which moves to the deformation prevention member 20 to the radial direction acts, the movement of the deformation prevention member 20 can be prevented by contact | abutting of the coating | coated part 22 and the bulging part 14. FIG. Therefore, it is possible to prevent the correspondence relationship between the guide hole 23a and the insertion hole 22a and the nut N from being shifted, and the bolt B inserted into the guide hole 23a can be easily inserted into the nut N.

  (3) The cover portion 22 is formed with a pair of engaging protrusions 22c and a concave groove 22b. And even if the force which moves to the deformation preventing member 20 to the circumferential direction acts by engaging a pair of engagement protrusion 22c with the engagement recess 16, and covering the groove 22b on the protrusion 15, it acts. The movement of the deformation preventing member 20 can be prevented. Accordingly, it is possible to prevent the correspondence relationship between the guide hole 23a and the insertion hole 22a and the nut N from deviating, and the bolt B inserted into the deformation preventing member 20 can be easily inserted into the nut N. .

  (4) A pair of positioning protrusions 23 c are formed on the guide portion 23 of the deformation preventing member 20. When the wiring box 11 is drawn to the mold 18, the pair of positioning protrusions 23 c are bite into the inner surface of the mold 18. Therefore, even if the wiring box 11 tries to move around when the nut body 30 is screwed into the bolt B, the accompanying movement of the wiring box 11 can be restricted via the deformation preventing member 20 by the biting of the positioning protrusion 23c.

  (5) Since the guide surface A of the guide portion 23 is mirror-finished, sunlight or the like that has entered the guide portion 23 from between the mold 18 and the end surface 23d is reflected on the guide surface A. With this reflected light, the operator can easily confirm the position of the deformation preventing member 20. Therefore, the operation of inserting the bolt B into the guide hole 23a can be quickly performed.

  (6) The guide hole 23a is formed so as to be reduced in diameter toward the insertion hole 22a, and the guide surface A forming the guide hole 23a is formed in a funnel shape. Therefore, the bolt B inserted into the guide hole 23a can be quickly guided to the insertion hole 22a by the guide hole 23a (guide surface A). Therefore, the bolt B can be guided by the guide hole 23a to the insertion hole 22a and the screw hole 14a (nut N) positioned directly below the insertion hole 22a. As a result, it is possible to contribute to simplification of the operation of screwing the bolt B into the nut N in a situation where it is difficult to visually recognize the wiring box 11 from the outside of the mold 18.

In addition, you may change the said embodiment as follows.
In the embodiment, the pair of positioning protrusions 23c are formed on the end surface 23d, but a large number of positioning protrusions 23c may be formed on the entire circumferential direction of the end surface 23d. Alternatively, the positioning protrusion 23c may be deleted.

  -In embodiment, although the guide surface A of the guide part 23 was mirror-finished, it does not need to give mirror finish. Instead, a phosphorescent material may be provided inside the guide portion 23 or a phosphorescent paint may be applied.

  In the embodiment, the engagement protrusion 22c is engaged with the engagement recess 16 of the wiring box 11, but the engagement protrusion 22c may be deleted. Or you may change the formation location of the engagement protrusion 22c according to the engagement recess 16. FIG. Furthermore, an engagement recess 16 having an annular shape that can be engaged with the peripheral wall 22d may be formed on the peripheral edge of the bulging portion 14 of the bottom portion 12, and the peripheral wall 22d may be engaged with the engagement recess 16. . At this time, the end surface 22e is brought into contact with the inner bottom surface (bottom portion 12) of the engagement recess 16.

  7 and 8, when the box cover 40 is attached to the opening side of the wiring box 11, the other end of the deformation preventing member 20 is positioned on the opening surface H (front surface) of the box cover 40. The connecting member 41 may be attached to the other end side of the main body 21. The box cover 40 has a rectangular frame shape and is provided with a coating allowance portion 40a having an annular shape at the center. And the opening for accommodating a wiring instrument etc. in the wiring box 11 is formed inside the coating allowance part 40a. The connecting member 41 is formed in a cylindrical shape from a synthetic resin material. The connecting member 41 has a small diameter portion 42 at one end thereof, and a large diameter portion 43 having a larger diameter than the small diameter portion 42 at the other end side. The small diameter portion 42 is formed in a size that can be fitted into the guide portion 23 of the main body 21. Further, a locking hole 44 in which the positioning projection 23c can be locked is formed in a stepped portion which becomes a boundary between the small diameter portion 42 and the large diameter portion 43.

  Then, the small diameter portion 42 is fitted into the guide portion 23 of the deformation preventing member 20 attached to the bottom portion 12, and the positioning projection 23 c is locked in the locking hole 44. Then, one end side of the connecting member 41 is attached to the other end side of the main body 21. At this time, the coupling member 41 is attached to the main body 21 in a state in which the rotation in the circumferential direction is restricted by the locking of the positioning protrusion 23 c and the locking hole 44. In this attached state, the end surface 43a (other end surface) of the large-diameter portion 43 of the connecting member 41 is positioned on the same plane as the opening surface H (front surface) of the coating allowance portion 40a of the box cover 40.

  Note that the number of connecting members 41 attached to the main body 21 according to the change in the position of the opening surface H accompanying the depth of the wiring box 11 and the position of the opening surface H accompanying the thickness of the coating allowance 40a of the box cover 40, or the axis line. Change the length in the direction. Alternatively, a large number of positioning protrusions 23c may be formed on the end surface 23d, and a large number of protrusions may be formed on the step portions of the small diameter portion 42 and the large diameter portion 43 so as to mesh with the positioning protrusions 23c.

  In the embodiment, the main body 21 may be formed in a cylindrical shape, and a guide hole 23 a that is substantially the same as the inner diameter of the nut N may be formed in the main body 21. That is, if the bolt B is guided toward the nut N, the shape of the guide hole 23a (guide surface A) may be arbitrarily changed. For example, the guide hole 23a may be formed so as to extend from the other end side of the main body 21 toward the one end side and then extend toward the insertion hole 22a with a constant inner diameter.

  In the embodiment, the cover portion 22 and the guide portion 23 are formed on the main body 21, but the main body 21 is configured by only the guide portion 23 from which the cover portion 22 is deleted, and the end face of the guide portion 23 positioned at one end of the main body 21 is used. It is good also as a 1st contact part and the end surface 23d of the guide part 23 located in the other end of the main body 21 is made into a 2nd contact part.

  In the embodiment, the deformation preventing member 20 is attached to the bottom portion 12. However, for example, an attachment portion that can attach the main body 21 to the side wall 13 is extended on the side portion of the main body 21 to prevent deformation by the attaching portion. The member 20 may be attached to the side wall 13. That is, if one end of the main body 21 surrounds the nut N and comes into contact with the bottom 12 and the other end of the main body 21 is located on the same plane as the opening surface H of the wiring box 11 or the opening surface of the box cover 40, The attachment method of the main body 21 to the wiring box 11 may be arbitrarily changed.

  For the wiring box deeper than the wiring box 11 of the embodiment, a deformation preventing member whose length in the axial direction is longer than that of the deformation preventing member 20 of the embodiment is used, and the wiring box 11 of the embodiment is used. For a shallower wiring box, a deformation preventing member having a shorter length in the axial direction than the deformation preventing member 20 of the embodiment may be used.

In the embodiment, the deformation preventing member 20 is formed in a substantially cylindrical shape, but the deformation preventing member 20 may be formed in a rectangular tube shape.
In the embodiment, when the deformation preventing member 20 is used as a wiring box guide member, the main body 21 has an end surface 23d (second surface) of the main body 21 with the end surface 22e (first contact portion) in contact with the bottom portion 12. The abutting portion) may be formed so as to recede from the opening surface H.

Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.
(1) The deformation prevention member for a wiring box according to any one of claims 1 to 5, wherein a positioning protrusion that can bite into the mold is formed on the second contact portion of the main body.

(2) The deformation preventing member for a wiring box according to claim 3, wherein the guide surface forming the guide hole is mirror-finished.
(3) A wiring box guide that is attached to the wiring box so as to guide a bolt that penetrates the concrete mold and is inserted into the wiring box in the concrete mold to a screw portion provided at the bottom of the wiring box. A member having a cylindrical main body through which the bolt penetrates, wherein the main body has a first abutting portion that surrounds the threaded portion at one end of the main body along the penetrating direction of the bolt and can abut against the bottom portion. A wiring box comprising a guide hole having a diameter reduced from the other end side along the penetrating direction toward the one end side in order to guide the bolt inserted into the main body from the other end of the main body to the threaded portion. Guide member.

  The guide hole is formed so as to reduce in diameter from the other end side of the main body along the penetrating direction toward one end side. For this reason, when the bolt inserted into the wiring box from the outside of the concrete formwork is inserted into the main body, that is, into the guide hole, it is guided toward one end of the main body by the guide hole and heads toward the screw portion. To be guided. As a result, it is possible to quickly perform the operation of screwing the bolt into the threaded portion by the guide hole. Therefore, according to the present invention, the bolt inserted into the wiring box can be guided to the threaded portion even in a situation where it is difficult to visually recognize the wiring box from the outside of the concrete formwork, and the bolt is screwed into the threaded portion. This can contribute to simplification of the work to be performed. That is, the object of the present invention is to guide the bolt inserted into the wiring box to the threaded portion even in a situation where it is difficult to see the wiring box from the outside of the concrete formwork, and screw the bolt into the threaded portion. An object of the present invention is to provide a wiring box guide member that can contribute to simplification of the work to be performed.

The perspective view which shows the wiring box of embodiment, the deformation | transformation prevention member for wiring boxes, etc. FIG. The front view which shows the inside of the wiring box of embodiment. The perspective view which mainly shows the guide part side of the deformation | transformation prevention member for wiring boxes of embodiment. The perspective view which mainly shows the coating | coated part side of the deformation prevention member for wiring boxes of embodiment. The side view which shows the state which fixed the wiring box of embodiment to the formwork. Sectional drawing which shows the state which fixed the wiring box of embodiment to the formwork. The perspective view which shows the state which attached the box cover to the wiring box. Sectional drawing which shows the state which fixed the wiring box with which the box cover was attached to the formwork.

Explanation of symbols

  A ... Guide surface, B ... Bolt, H ... Open surface, N ... Nut as screw part, 11 ... Wiring box, 12 ... Bottom part, 18 ... Concrete formwork, 20 ... Deformation preventing member for wiring box, 21 ... Main body, 22b: a concave groove constituting the first contact portion, 22c: an engagement protrusion constituting the attachment portion and the first contact portion, 22e: an end face constituting the first contact portion, 23a: a guide hole, 23d ... End face as second contact portion, 40... Box cover, 41.

Claims (5)

When the bolt inserted through the concrete formwork and inserted into the wiring box inside the concrete form is screwed into the threaded portion of the bottom of the wiring box to draw the wiring box to the concrete formwork, the wiring box is A deformation prevention member for a wiring box, which is attached to the wiring box to prevent deformation and is provided separately from the wiring box,
A cylindrical main body through which the bolt penetrates, and the main body includes a first abutting portion that surrounds the threaded portion at one end of the main body along a penetrating direction of the bolt and abuts against the bottom portion in a non-rotatable manner ; With the other end of the main body along the penetrating direction, the first abutting portion is in contact with the bottom, and is located on the same plane as the opening surface of the wiring box or the opening surface of the box cover attached to the wiring box. A deformation prevention member for a wiring box, comprising a second contact portion capable of contacting the concrete formwork. The said main body is a deformation | transformation prevention member for wiring boxes of Claim 1 provided with the attaching part for attaching this main body to the bottom part of a wiring box in the one end side of a main body. The said main body is equipped with the guide hole diameter-reduced toward the one end side from the other end side of the main body along the said penetration direction in order to guide the said bolt to the said thread part. The deformation prevention member for a wiring box as described. The deformation prevention member for a wiring box according to claim 3, wherein the guide surface forming the guide hole is formed in a funnel-shaped surface shape. A connecting member is attached to the other end of the main body, and the other end of the connecting member is the same as the opening surface of the wiring box or the opening surface of the box cover with one end side attached to the other end side of the main body. The deformation prevention member for a wiring box according to any one of claims 1 to 4, wherein the deformation prevention member is formed so as to be positioned on a plane.

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