JP2008169650A - Joining device of concrete member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To complete required connecting work only by a joint part between adjacent concrete members. <P>SOLUTION: This device has a constitution for threadedly engaging a joining bolt with an insert nut, by rotatably incorporating the joining bolt threadedly engaging with the insert nut into the other concrete member, by embedding the insert nut in one concrete member, for joining the adjacent concrete members, and has a head part 25 rotatably incorporated into a bolt holding part of the other concrete member, a bolt part 26 threadedly engaging the insert nut 13 of one concrete member, and a bolt hooking part 27 formed between the head part and the bolt part for hooking an action part of a tool 30 for rotating the joining bolt, as the joining bolt 22, and has a constitution for forming the action part of the tool by using a plate-like member and forming the plate thickness of its member as the smallest clearance between both concrete members. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the present invention, in order to connect adjacent concrete members, an insert nut is embedded in one concrete member, a connecting bolt screwed into the insert nut is rotatably incorporated in the other concrete member, and the connecting bolt is screwed into the insert nut. The present invention relates to an apparatus having a configuration to be combined.

  In the conventional method of connecting concrete members arranged adjacent to each other, a connecting member such as a nut is implanted in the connecting end portion of the concrete member in advance at a right angle to the connecting direction, and the connecting plate is formed by bolts screwed into both connecting members. There was a way to bolt. In this method, one of the bolt holes of the connecting plate is made into a long hole, and the interval between the concrete members can be narrowed. However, pulling the concrete members together at the time of connection has to be done by another work. . On the other hand, a bonding plate is embedded and attached to both of the concrete members, a working space is formed inside the bonding plate, and the bolts in the bonding direction are operated from the space so that the concrete members There is a way to conclude. However, in this configuration, since the coupling plate is easily deformed by the tightening force of the bolt, the limit of the pulling force is low. In addition, the working space must be filled last, and there is also a problem that the unit price is high because the structure of the coupling plate has welded portions.

  In view of this, the present inventor has developed a concrete product connection structure and a connection tool using turnbuckle bolts that are attached to concrete members arranged adjacent to each other, and screwed into the insert nut and the connection tool, respectively (special features). No. 2003-239392). However, since it is configured according to a commercially available insert nut, the length of the bolt is limited, and it is difficult to obtain a necessary adjustment amount. Moreover, the notch part for performing a bolt operation is required for at least one of the concrete products, and workability is not good, and it is also necessary to fill the notch part.

  Further, the present inventor has developed a connection device that can perform substantially complete operations such as coupling, pulling, and joining between concrete members without any reduction in rigidity in the connection portion (Japanese Patent Laid-Open No. 2006-2006). 70622). In the present invention, a structure that does not require welding can be selected, and the unit price can be reduced. However, since the bolting work port is open, there is still a need to close it in a later process. ing.

JP 2003-239392 A JP 2006-70622 A

  The present invention has been made paying attention to the above points, and the problem is that the necessity of the notch portion is eliminated, and the required connecting operation can be completed only at the joint portion between adjacent concrete members. It is to provide a coupling device for members. Another object of the present invention is to provide a connecting device for a concrete member that can obtain an adjustment amount necessary and sufficient for pulling the concrete member and can be suppressed to a sufficiently low unit price.

  In order to solve the above-mentioned problems, the present invention embeds an insert nut in one concrete member and couples a connecting bolt that is screwed into the insert nut into the other concrete member so as to be connected to each other. An apparatus having a structure for screwing a coupling bolt to an insert nut, wherein the head is rotatably incorporated in a bolt holding portion of the other concrete member as a coupling bolt, and is screwed to the insert nut of one concrete member. In order to hang a bolt part to be joined and an action part of a tool for rotating the joining bolt, a bolt hook part formed between the head part and the bolt part is provided, and the action part of the tool uses a plate-like member The thickness of the member is designed to be the smallest gap between both concrete members. And those (the invention according to claim 1).

  In the apparatus according to the present invention, an insert nut is embedded in one of the adjacent concrete members, and a coupling bolt that is screwed into the insert nut is incorporated in the other concrete member. The coupling bolt is incorporated so as to rotate in the other concrete member. The head portion rotatably held by the bolt holding portion of the other concrete member and the bolt portion screwed to the insert nut of the one concrete member. And in order to latch the action | operation part of the tool which rotates a coupling bolt, it is necessary to have provided the bolt hook part formed between the said head part and a bolt part.

  In this invention, a tool is comprised so that the board | plate thickness of the action part which hangs it may become the minimum clearance gap between both concrete members. The structure is obtained by forming the action part using a plate-like member. On the other hand, the bolt hooking portion provided on the coupling bolt may be provided in a range that is at least as large as the plate thickness of the plate-like member so that the action portion of the tool can be hooked. Note that the passing dimension of the bolt hook portion can be selected to be larger or smaller than the bolt diameter.

  In the present invention, the minimum gap between both concrete members is determined by the plate thickness dimension of the plate-like member. This is because in the final tightening stage where the coupling bolt is tightened by the tool, the bolting is performed. This also means that the portion is arranged at a position corresponding to a joint between adjacent concrete members. When the coupling bolt is rotatable at a substantially constant position (is capable of idling), the bolt hook portion is also at a substantially constant position when the apparatus of the present invention is applied between the concrete members. From this, the bolt hanging portion is located at the end of the other concrete member in a state where the head of the coupling bolt is correctly set on the other concrete member.

  As an example of such a bolting portion of the connecting bolt, the connecting bolt is formed with a uniform cross-sectional shape in a predetermined range of the region from the head to the bolt on the tip side, and the connecting bolt is the other concrete member. In the state where it is incorporated in, it can be configured so as to exit to the outside from the end of the other concrete member at least by the amount by which the working portion of the tool can be latched. The predetermined range in which the bolting is provided is a range located at the end of the other concrete member.

  Of course, the bolt is incorporated into the other concrete member so that it cannot be removed. In order to do this naturally, as a bolt holding portion, a cylindrical embedded barrel is embedded in the other concrete member, a plug member is attached to the embedded barrel by screwing means, and a coupling bolt is attached to the plug member. It can be configured to be rotatable (claim 3). The above-described configuration is an example of means for disposing the head portion of the coupling bolt inside the plug member so that the coupling bolt can rotate at a fixed position (can be idled). If a specific example of the form of the idling plug member is shown, a cylindrical shape such as a cup having a bottom corresponds to the form, and the coupling bolt is assembled from a hole opened in the bottom, so that the bolt is fixed at a certain position. It can be installed in a rotatable manner.

  Constructed by interposing an elastically deformable member that absorbs compressive force in the bolt axial direction between the inner end of the embedded barrel embedded in the other concrete member and the head of the coupling bolt. (Claim 4). Taking the plug member of the above form as an example, a hole is formed in the bottom of the cylindrical member, a coupling bolt is passed through, and the head can be locked and incorporated into a rotatable state. By providing an external force absorbing means in the portion of the plug member to be locked, it is possible to provide an earthquake-resistant connection function.

  In addition, the inner end portion embedded in one concrete member of the insert nut and the inner end portion of the embedded trunk portion embedded in the other concrete member each have an anchor portion formed in a large size with respect to the other portion. In addition, the insert nut and the anchor portion of the embedded body portion may be closed by another member (claim 5). Such an insert nut exhibits a strong anchor effect with a degree of design change, and the embedded barrel has a shape similar to that of the insert nut, and is low by casting, for example, ductile cast iron (FCD) as a material. It can be mass-produced at a cost.

  Since the present invention is configured and operates as described above, it is not necessary to provide a notch portion in the concrete member as in the prior art, but only at the joint between adjacent concrete members. Therefore, the workability is remarkably improved, and it is not necessary to fill the notch portion by post-processing. In particular, according to the present invention, the concrete member is attached by the connecting bolt. There is an effect that it is possible to provide a connecting device for a concrete member that can obtain a necessary and sufficient adjustment amount for drawing and that can sufficiently suppress the unit price.

  Hereinafter, the present invention will be described in more detail with reference to illustrated embodiments. FIG. 1 shows an example 1 of a concrete member joining apparatus 10 according to the present invention. In order to join adjacent concrete members 11 and 12, an insert nut 13 is embedded in one concrete member 11 and the other concrete member 11 is joined. A bolt holding portion 14 is embedded in the concrete member 12.

  As shown in FIG. 1, the illustrated insert nut 13 has a pipe shape in which both ends of an inner end embedded in one concrete member 11 and an outer end exposed at an end of one concrete member 11 are opened. belongs to. On the outer peripheral surface of the inner end portion, an enlarged anchor portion 15 is formed that is larger than the other portions so as to be resistant, and an internal thread portion is formed on the inner peripheral surface of the outer end portion. 16 is formed. In addition, the entire outer peripheral surface of the insert nut 13 and the embedded barrel portion 18 to be described later is provided with an uneven rough surface portion 17 for increasing the adhesion of concrete.

  The illustrated bolt holding portion 14 includes a cylindrical embedded body portion provided with a closed inner end portion embedded in the other concrete member 12 and an open outer end portion exposed at the end portion of the other concrete member 12. 18. The embedded body portion 18 has a female screw portion 19 as a screwing means on the inner peripheral surface of the outer end portion, and has a plug member 20 attached by a male screw portion 21 screwed to the plug member 20. In addition, the coupling bolt 22 is rotatably incorporated by the configuration described later. The inner end portion of the insert nut 13 is closed by the cap 23 during construction, but is formed as a wall surface 24 that is closed in advance on the inner end portion of the bolt holding portion 14. The reason is that if the embedded body 18 becomes large, a cap must be custom-made, resulting in high costs.

  The coupling bolt 22 has a head screw 25 at one end and a bolt screw portion 26 as a screwing means with the insert nut 13 at the tip end, and within a predetermined range of the region from the head to the bolt screw portion at the tip end of the tip 25. The bolt hanger 27 is formed with a uniform hexagonal cross-sectional shape. Reference numeral 27a denotes a leading end guiding portion, which is provided for guiding 13 to the insert nut. Further, the plug member 20 is provided with a bolt through hole 28. The diameter of the plug member 20 is smaller than the outer diameter of the bolt head 25, so that the coupling bolt 22 can be rotated by locking the head 25 ( Idling).

  The bolt hooking portion 27 in the illustrated connecting bolt 22 is provided with almost all parts from the head 25 to the bolt screw portion 26. As a result, the end of the other concrete member 12 is not limited to the amount where the working portion of the tool can be hooked, and it is guaranteed that the bolt hook portion 27 is positioned. This is also because the longer part leads to the advantage of better workability. And the coupling | bonding apparatus 10 of the concrete member of this invention is comprised also by the structure which does not interpose the elastic deformation member mentioned later as a coupling bolt as FIG.

  In Example 1 of the concrete member coupling device 10 according to the present invention having such a configuration, a coupling bolt rotatably incorporated in the other concrete member 12 in an insert nut 13 embedded in one adjacent concrete member 11. Both concrete members 11 and 12 are joined by screwing 22 together. That is, after the coupling bolt 22 is passed through the plug member 20, the plug member 20 is screwed into the bolt holding portion 14, and the head portion 25 is locked to the inner end portion of the plug member 20 via the washer 29. In the state, the bolt screw portion 26 is screwed into the female screw portion 16 of the insert nut 13. See FIG. In order to rotate the coupling bolt 22, the action portion 31 of the tool 30 is hung on the bolt hook portion 27 exposed at the end portion of the other concrete member 12. Since the action part 31 of the tool 30 is formed using a plate-like member, when the tool 30 is rotated as shown in FIG. 2, the plate thickness t of the tool 30 is the smallest gap between both concrete members ( One concrete member 11 can be drawn toward the other concrete member 13 until the joint interval is reached.

  FIG. 3 and the subsequent drawings show Example 2 of the apparatus according to the present invention. In addition to the configuration of Example 1, the inner end of the embedded barrel 18 embedded in the other concrete member 12 and the coupling bolt 22 are shown. The elastic deformation member 33 which absorbs the compressive force of a volt | bolt axial direction and can deform | transform is interposed between the washer 29 with which the head 25 of this is latched. The elastic deformation member 33 of Example 2 is a short cylindrical part formed with an elastic deformation portion 32 swelled outward around the trunk using a steel pipe as a material. Since other configurations may be the same as those in Example 1, only the reference numerals are used without repeating the detailed description. Note that, in both Example 1 and Example 2, the insert nut 13 and the bolt holding part 14 are cast products made of ductile cast iron. Further, the inner end portion embedded in one concrete member 11 of the insert nut 13 and the inner end portion of the bolt holding portion 14 embedded in the other concrete member 12 are formed larger than the other portions. The anchor portions 34 and 35 are formed.

  The configuration related to the apparatus 10 of Example 2 will be described. In FIG. 3, B is a work opening width, F is a dimension from the inner surface of the washer to the end of the other concrete member 12, and A is a screwing required for drawing ( (Scheduled) dimension G indicates the spanner allowance, that is, the dimension of the portion where the working part of the tool is applied. Therefore, the so-called neck length of the connecting bolt 22 is B + F + A. FIG. 4 shows a state in which the connecting bolt 22 is screwed from the state of FIG. 3 by a screwing dimension A, where A is a screwing dimension and H = G + A. FIG. 5 shows a final process in which the connecting bolt 22 is further screwed using the tool 30 and the other concrete member 12 is pulled to the maximum extent, and C is the minimum gap between the two concrete members 11 and 12. (Joint interval). Accordingly, the dimension is slightly larger than the plate thickness t of the action portion 31 or is infinitely close. D is a threaded dimension between the female threaded portion 16 and the bolt threaded portion 26, and has a threaded dimension only within a range that can bear the strength necessary for fastening both the concrete members 11 and 12.

  In the case of actually applying each of the above examples, it is considered that it is rare to provide the device 10 according to the present invention at only one location, so that the strength necessary for fastening both the concrete members 11 and 12 in the entire device group is increased. It only has to be borne. Moreover, in the said Example 1 and Example 2, although the recessed part 36 which makes the opening of an insert nut the bottom is formed in one concrete member side, this is for guide | inducing the front-end | tip part of the coupling bolt 22 to the said opening.

  The experimental results of Example 2 of the apparatus 10 according to the present invention will be described with reference to FIGS. In the experimental example, the insert nut 13 and the embedded body 18 are both cast products made of FCD, the plug member 20 is a steel machined product, the elastic deformation member 33 is a steel molded product, and the coupling bolt 22 is a ductile. It is made of cast iron and uses an elastic deformation member 33 of 47 KN, and the weight of the concrete member 11 to be drawn is about 2200 kilograms. Under these conditions, the thickness of the working portion 31 of the tool 30 is 5 mm, the initial joint spacing is 40 mm, the effective length of the female screw portion 16 is 35 mm, the length of the male screw portion 26 of the coupling bolt, and the screw of the plug member 20 When the effective length of the part is 40 mm and the total length of the coupling bolt 22 is 150 mm, the work amount in the work using the tool 30 is 5.32 kgfm in torque value. As described above, according to the present invention, it was possible to easily draw a heavy-weight concrete member to a close distance of 5 mm with a relatively light operating force using the tool 30 made of a plate-like member.

  Further, Example 3 of the apparatus 10 according to the present invention will be described with reference to FIGS. In Example 3, a measure against the error is taken to absorb the misalignment between the insert nut 13 and the bolt holding portion 14, and a washer 39 disposed loosely on the bolt holding portion 14 side is used as a washer. As shown in FIG. 8, the washer 39 is formed with a bolt hole 37 passing through the washer 39 as a long hole in the diameter direction, and when the position of the coupling bolt 22 is shifted from the center C, the washer 39 is moved in the long hole direction. It can be adjusted by rotation around the center point, and has protrusions 38 on both sides of the bolt hole 37 as engaging means with the bolt holding part 14 side.

  FIG. 9 shows Example 3 of the apparatus 10 according to the present invention using the washer 39 described above, and uses two leg portions 41 and 42 and a bolt holding portion 44 having a bifurcated structure as a bolt holding portion. Thus, a bolt through hole 48 is formed in the crotch enlarged portion 43. The washer 49 is formed so that the projection 38 can be inserted into the hole inside the bolt through hole 48. In the case of Example 3, the elastic deformation member 33 is first fitted at the end thereof. In addition, the washer 39 is disposed by inserting the protrusion 38 into the opening of the inner end 45 of the elastic deformation member 33. In the case of Example 3, the arrangement method of fitting the end portion of the elastic deformation member 33 into the hole inside the bolt through hole 48 is also different from that of Example 2. Since other configurations are the same as those of Example 1 or Example 2, reference numerals are used and detailed description thereof is omitted.

  Even in the apparatus 10 of Example 3 according to the present invention, both the insertion nuts 13 embedded in one adjacent concrete member 11 are screwed together with the coupling bolts 22 rotatably incorporated in the other concrete member 12, thereby The concrete members 11, 12 can be joined. That is, the connecting bolt 22 has the elastic deformation member 33 disposed at the opening of the inner end 45 of the bolt holding portion 44, and then the bolt head 25 is connected to the inner end of the plug member 20 via the washer 39. It is in a state of being locked to the part. Here, the bolt screw portion 26 is screwed into the female screw portion 16 of the insert nut 13. When the axial centers of the screw portions 16 and 26 do not coincide with each other, the washer 39 is rotated and the coupling bolt 22 is rotated. Is moved within the range of the bolt hole 37 to adjust the position. The coupling bolt 22 is formed by hanging the working portion 31 of the tool 30 on the bolt hanging portion 27 exposed at the end of the other concrete member 12 and rotating it, so that the plate thickness t of the tool 30 is the same for both concrete. One concrete member 11 can be drawn to the other concrete member 13 until the minimum gap (joint interval) between the members is reached.

1 shows Example 1 of a concrete member coupling device according to the present invention, in which A is a side cross-sectional view of an insert nut and an embedded barrel, B is a side view of a coupling bolt, C is also a left side view of B, and D is also the same. B is a right side view with respect to B, E is a front view of the plug member, and F is a right side view with respect to E. FIG. The application example to the concrete member of an apparatus same as the above is shown, A is a partially sectional side view, and B is a side view and a front view of a tool to be used. It is side surface explanatory drawing which shows Example 2 of the apparatus of this invention. It is explanatory drawing which shows the state which screwed the coupling bolt into the insert nut from the state of FIG. Furthermore, it is explanatory drawing which shows the state which completed the operation | work which draws in one concrete member using a tool from the state of FIG. The example of experiment of the device concerning the present invention is shown and it is a sectional view before drawing. It is sectional drawing after drawing completion similarly. An example of the washer used for Example 3 of the device of the present invention is shown, A is a front view, B is a sectional view taken along line VIIIB-VIIIB in FIG. 8A, and C is a sectional view taken along line VIIIC-VIIIC in FIG. FIG. 3 shows Example 3 of the apparatus of the present invention, in which A is a partially broken plan view, B is a side view of a bolt holding part, and C is a front view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Concrete member coupling | bonding apparatus 11 One concrete member 12 The other concrete member 13 Insert nut 14, 44 Bolt holding | maintenance part 15 Anchor part 16, 19 Female thread part 17 Rough surface part 18 Embedded trunk | drum 20 Plug member 21 Male thread part 22 Connection bolt 23 Cap 24 Wall surface 25 Head portion 26 Bolt screw portion 27 Bolt hook portion 27a Tip guide portion 28, 48 Bolt through hole 29, 39 Washer 30 Tool 31 Action portion 32 Elastic deformation portion 33 Elastic deformation member 34, 35 Anchor portion 36 Recess 37 Bolt Hole 38 Projection 41, 42 Leg 43 Crotch 45 Inner end

Claims (6)

In order to connect adjacent concrete members, an insert nut is embedded in one concrete member, a connecting bolt that is screwed into the insert nut is rotatably incorporated in the other concrete member, and the connecting bolt is screwed into the insert nut. An apparatus comprising: a head that is rotatably incorporated in a bolt holding portion of the other concrete member as a coupling bolt; a bolt portion that is screwed into an insert nut of one concrete member; and a tool that rotates the coupling bolt In order to hang the working portion, a bolt hook portion formed between the head portion and the bolt portion is provided, and the working portion of the tool is formed using a plate-like member, and the thickness of the member is A concrete member coupling device, wherein the concrete member is configured to have a minimum gap between both concrete members. The bolt hanging portion of the coupling bolt is formed with a uniform cross-sectional shape in a predetermined range from the head to the bolt on the tip side, and the coupling bolt is incorporated in the other concrete member. 2. The apparatus for connecting concrete members according to claim 1, wherein the concrete member coupling device is configured so as to come out from the end of the other concrete member by at least the amount by which the working portion of the tool can be latched. The bolt holding portion is configured by embedding a cylindrical embedded barrel portion in the other concrete member, attaching a plug member to the embedded barrel portion by screwing means, and incorporating a coupling bolt into the plug member in a rotatable manner. The apparatus for connecting concrete members according to claim 1. Constructed by interposing an elastically deformable member that absorbs compressive force in the bolt axial direction between the inner end of the embedded barrel embedded in the other concrete member and the head of the coupling bolt. The connecting device for a concrete member according to claim 3. The inner end embedded in one concrete member of the insert nut and the inner end of the embedded barrel embedded in the other concrete member constitute an anchor portion formed in a large size with respect to the other portion. The connecting device for a concrete member according to claim 3, wherein the insert nut and the anchor portion of the embedded body portion are closed by separate members. As a measure to absorb the misalignment between the insert nut and the bolt holding part, a washer arranged loosely on the bolt holding part side is used, and the bolt hole passing through the washer is formed as a long hole in the diameter direction, 2. The concrete member joining apparatus according to claim 1, wherein when the position of the joining bolt deviates from the center, the joining bolt can be adjusted by movement in the direction of the long hole and rotation around the center point.

Images