JP6836338B2 - Spacer - Google Patents

Description

The present invention relates to spacers attached to reinforcing bar cages for constructing on-site piles.

Conventionally, on-site piles have been used as the foundation structure of buildings. When constructing on-site piles, excavation holes are formed using excavation jigs such as casings. At this time, for the purpose of protecting the excavation holes, the inside of the excavation holes is filled with excavation muddy water, and the excavation holes are filled with muddy water pressure. Prevents collapse. Then, after inserting the reinforcing bar cage into the excavation hole filled with muddy water, the tremie pipe is inserted to a predetermined depth, and then concrete is poured to construct the pile. In such an excavation method, concrete is placed in an excavation hole filled with excavation muddy water to replace the excavation muddy water, so that there is a problem that sludge, which is an industrial waste, is excessively generated.

In order to solve such problems, the CFA (Continuous Flight Auger) method is currently proposed as a method for constructing piles and colonnade walls (underground walls) in the ground. In this method, for example, a large-diameter auger (pile drilling machine) is used to drill holes to a predetermined depth, and earth and sand are discharged. While pulling up this auger, concrete or mortar is injected from the tip and placed, and then the core material is used. It is said that cast-in-place piles and column walls can be constructed by inserting the reinforcing bars and shaped steel to be used into concrete and mortar, and piles such as piles and column walls can be constructed relatively easily by on-site construction. There are advantages. In this CFA method, while preventing the collapse of the hole wall during drilling and supporting the earth pressure applied to the hole wall with an auger, the earth and sand are replaced in the hole with concrete or mortar to construct piles and column walls. Discard the discharged earth and sand. Therefore, the excavated soil can be significantly reduced as compared with the conventional cast-in-place pile method.

By the way, in order to secure the cover thickness required for inserting the reinforcing bar cage into the muddy water filled in the drilling hole, the reinforcing bar cage inserted in the excavation hole for constructing the on-site construction pile is spacerd. Is installed. In recent years, a technique has been proposed in which the projected area of the spacer in the axial direction (insertion direction) of the reinforcing bar cage is reduced to reduce the resistance when inserting the reinforcing bar cage into the drilling hole and shorten the insertion time. (See, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2012-162855

When a conventional spacer as described in Patent Document 1 is adopted, it is necessary to increase the strength so that the spacer is not deformed when the drilling hole is inserted. Therefore, the thickness and strength of the material can be increased or the reinforcing bar can be used. It is necessary to firmly fix the joint with the main reinforcing bar of the cage by welding. However, if a high-strength material or a thick material is used, there is a problem that the manufacturing cost of the spacer increases. In addition, welding to the main reinforcing bar is not desirable in the first place because there is a concern that the strength may decrease, and there are cases where such welding work cannot be performed on site. Further, since the conventional spacer as described in Patent Document 1 is attached so as to protrude outward in the radial direction from the main reinforcing bar, the rigidity in the circumferential direction is low, and it can be used for loading and unloading and in the drilling hole. There was a problem that it was easily damaged when it was inserted. Further, when such a spacer is transported to the site in a state of being welded to the main reinforcing bar of the reinforcing bar cage, the load becomes bulky on the transport vehicle and the spacer comes into contact with other members during loading and unloading. It may be damaged.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a spacer which does not require welding work when attaching a reinforcing bar cage to a main reinforcing bar and has relatively high rigidity even in the circumferential direction. And.

In order to achieve the above object, the spacer according to the present invention is attached to a cylindrical reinforcing bar cage inserted into the drilling hole, and is radially extending from the main reinforcing bar extending in the axial direction of the reinforcing bar cage to the reinforcing bar cage. The inner wall of the drilling hole is connected to the space holding part that protrudes outward by a predetermined height and extends for a predetermined length in the axial direction of the reinforcing bar cage, and the end of the space holding part that is opposite to the main reinforcing bar. It is provided with an inner wall contact portion configured to abut against the main reinforcing bar, and the end portion of the space holding portion on the main reinforcing bar side is configured to be attached to a plurality of main reinforcing bars via non-welding means. is there.

When such a configuration is adopted, the end portion of the space holding portion on the main reinforcing bar side can be attached to the main reinforcing bar of the reinforcing bar cage via "non-welding means". Therefore, since it is not necessary to perform the welding work when attaching the spacer to the main reinforcing bar, problems such as a decrease in strength due to the welding work can be solved, and the mounting work can be performed even at a site where welding is not possible. In addition, since the end of the space holding part on the main reinforcing bar side is attached to "plurality" of main reinforcing bars, stability can be increased without rigidly fixing the attached portion by welding, and even in the circumferential direction. Since relatively high rigidity can be ensured, there is an advantage that stability is large and deformation is difficult even when a relatively thin material is used. Since a relatively thin material can be used, the cost of manufacturing the spacer can be reduced. Further, the strength of the spacer can be changed by changing the number of main reinforcing bars to be attached. Further, since the reinforcing bar cage and the spacer can be separated and transported, the load does not become bulky on the transport vehicle.

In the spacer according to the present invention, the portion of the space holding portion excluding the end on the main reinforcing bar side and the inner wall contact portion can be formed into a plate shape by processing a single plate-like body. Further, the space holding portion including the end portion on the main reinforcing bar side and the inner wall contact portion can be formed into a plate shape by processing a single plate-like body.

When such a configuration is adopted, by processing a single plate-like body, the space holding portion abuts on the inner wall with the portion excluding the end on the main reinforcing bar side (or the space holding portion including the end on the main reinforcing bar side). Since the portion and the portion can be formed in a plate shape, processing becomes easy.

In the spacer according to the present invention, it is possible to employ a space holding portion having a plurality of branched portions that branch from one location on the inner wall contact portion in a plurality of directions in a plan view. In such a case, the angle formed by the inner wall contact portion and the branch portion and the angle formed by the branch portions can be changed.

When such a configuration is adopted, the space holding portion has a plurality of branch portions that branch from one location of the inner wall contact portion to a plurality of directions in a plan view, and the angle formed by the inner wall contact portion and the branch portion and the branch portion. Since the angle between each other can be changed, the mounting position on the main reinforcing bar can be freely changed, and the form can be transformed into a form with less resistance. Further, the number of spacers to be used can be changed by changing the angle formed by the branch portions.

In the spacer according to the present invention, it is possible to employ a space holding portion having a plurality of extending portions extending in different directions from two locations of the inner wall contact portion in a plan view. In such a case, the angle formed by the inner wall contact portion and the extending portion can be changed.

When such a configuration is adopted, the space holding portion has a plurality of extending portions extending from two locations of the inner wall contact portion in different directions in a plan view, and the angle formed by the inner wall contact portion and the extending portion. Is changeable, so the mounting position on the main reinforcing bar can be freely changed, and it can be transformed into a form with less resistance. Further, the number of spacers used can be changed by changing the angle formed by the inner wall contact portion and the extending portion.

In the spacer according to the present invention, a non-welding means having a bolt can be adopted.

When such a configuration is adopted, the end portion of the space holding portion on the main reinforcing bar side can be attached to the main reinforcing bar via a bolt, so that the attachment work becomes extremely easy.

In the spacer according to the present invention, an opening type annular portion configured to sandwich the main reinforcing bar by elastic force can be provided at the end portion of the spacer holding portion on the main reinforcing bar side. This open ring can form a non-welding means. Further, a non-welding means having a retaining means for preventing the opening type annular portion from coming off from the main reinforcing bar can also be adopted.

When such a configuration is adopted, the end of the spacer holding portion on the main reinforcing bar side is attached to the main reinforcing bar by sandwiching the main reinforcing bar with the elastic force of the opening type annular portion provided at the end of the spacer holding portion on the main reinforcing bar side. Therefore, the installation work becomes extremely easy. Further, by adopting the retaining means, it is possible to prevent the opening type annular portion from coming off from the main reinforcing bar.

According to the present invention, welding work at the time of attaching the reinforcing bar cage to the main reinforcing bar is unnecessary, and it is possible to provide a spacer having relatively high rigidity even in the circumferential direction.

It is a top view of the spacer which concerns on 1st Embodiment of this invention. It is a perspective view of the spacer which concerns on 1st Embodiment of this invention. It is a top view of the reinforcing bar cage in the state which attached the spacer which concerns on 1st Embodiment of this invention. It is a top view of the spacer which concerns on 2nd Embodiment of this invention. It is a perspective view of the spacer which concerns on 2nd Embodiment of this invention. It is a top view of the spacer which concerns on 3rd Embodiment of this invention. It is a perspective view of the spacer which concerns on 3rd Embodiment of this invention. It is an enlarged perspective view of the end portion of the spacer which concerns on 3rd Embodiment of this invention. It is a top view of the spacer which concerns on 4th Embodiment of this invention. It is a perspective view of the spacer which concerns on 4th Embodiment of this invention. It is a top view of the spacer which concerns on 5th Embodiment of this invention. It is a perspective view of the spacer which concerns on 5th Embodiment of this invention. It is a top view of the spacer which concerns on 6th Embodiment of this invention. It is a perspective view of the spacer which concerns on 6th Embodiment of this invention. It is a top view of the reinforcing bar cage in the state which attached the spacer which concerns on 6th Embodiment of this invention.

Next, the spacer according to each embodiment of the present invention will be described with reference to the drawings. It should be noted that each of the embodiments described below is an example for explaining the present invention, and the present invention is not limited to these embodiments. Therefore, the present invention can be implemented in various forms as long as it does not deviate from the gist thereof.

<First Embodiment>
First, the spacer 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 3.

The spacer 1 according to the present embodiment is attached to a cylindrical reinforcing bar cage C (FIG. 3) inserted into the excavation hole. The spacer 1 projects at a predetermined height outward from the main reinforcing bar S extending in the axial direction of the reinforcing bar cage C (direction A in FIG. 2) in the radial direction of the reinforcing bar cage C (direction R in FIG. 3), and the reinforcing bar cage C The space holding portion 10 is configured to extend for a predetermined length in the axial direction of the space holding portion 10 and the end portion 15 on the opposite side of the main reinforcing bar S of the space holding portion 10 is connected to the space holding portion 10 so as to abut on the inner wall of the drilling hole. The inner wall contact portion 20 is provided.

By having the space holding portion 10, it is possible to provide an appropriate cover thickness between the reinforcing bar cage C and the hole wall of the excavation hole. It is preferable that the space holding portion 10 is radially attached from the outer peripheral portion of the reinforcing bar cage C to the outside so that the central axis O of the reinforcing bar cage C and the central axis of the excavation hole overlap.

In the present embodiment, as shown in FIGS. 1 and 2, a portion of the space holding portion 10 other than the end portion 14 on the main reinforcing bar S side and the inner wall contact portion 20 process a single plate-like body. As a result, it is formed in a plate shape. That is, as shown in FIG. 2, space is retained by making two parallel cuts from one side of one plate-shaped body having a substantially rectangular shape and bending the plate-shaped body at the ends of the cuts. A plurality of branch portions 11, 12, and 13 constituting the portion 10 and an inner wall contact portion 20 are formed.

The branch portions 11, 12, and 13 formed in this way are arranged along the axial direction A as shown in FIG. 2, and in a plan view, one location of the inner wall contact portion 20 as shown in FIG. It is configured to branch from 21 in a plurality of directions. As shown in FIGS. 1 and 2, the branch portions 11 and 13 located at both ends in the axial direction and the branch portions 12 located at the center in the axial direction extend in different directions, as shown in FIG. It is designed to be attached to different main reinforcing bars S. The angle formed by the inner wall contact portion 20 and the branch portions 11, 12, 13 and the angle formed by the branch portions 11, 12, 13 can be changed.

The plate-like body constituting the space holding portion 10 and the inner wall contact portion 20 can be made of a rigid material (for example, a metal material such as iron or aluminum or a non-metal material such as various ceramics or plastics). The size (vertical and horizontal dimensions) and thickness of the plate-shaped body can be appropriately set according to the size of the spacer 1 to be formed.

As shown in FIG. 1, the end portion 14 of the space holding portion 10 on the main reinforcing bar S side is formed in a U shape in a plan view. The inner diameter D of the end portion 14 is set to be substantially the same as the outer diameter of the main reinforcing bar S of the reinforcing bar cage C, so that the main reinforcing bar S is fitted inside the end portion 14 as shown in FIG. It has become. The end portion 14 can be made of a material having rigidity (metal material or non-metal material) like the space holding portion 10, and is joined to the branch portions 11, 12, 13 of the space holding portion 10 by welding or the like. There is.

In the present embodiment, the main reinforcing bar S is prevented from coming off from the end portion 14 by mounting the bolt 30 from the outside in a state where the main reinforcing bar S is fitted inside the end portion 14. That is, the bolt 30 is for attaching the end portion 14 of the space holding portion 10 on the main reinforcing bar S side to the main reinforcing bar S, and functions as a non-welding means in the present invention.

In the spacer 1 according to the embodiment described above, the end portion 14 of the space holding portion 10 on the main reinforcing bar S side can be attached to the main reinforcing bar S of the reinforcing bar cage C via the bolt 30 (non-welding means). Therefore, since it is not necessary to perform welding work when attaching the spacer 1 to the main reinforcing bar S, problems such as a decrease in strength due to the welding work can be solved, and the attachment work can be performed even at a site where welding is not possible. Further, since the end portion 14 of the space holding portion 10 on the main reinforcing bar S side is attached to the "plurality" of main reinforcing bars S, the stability can be increased without fixing the attached portion rigidly by welding. Since relatively high rigidity can be ensured even in the circumferential direction, there is an advantage that stability is large and deformation is difficult even when a relatively thin material is used. Further, since a relatively thin material can be used, the manufacturing cost of the spacer 1 can be reduced. Further, the strength of the spacer 1 can be changed by changing the number of main reinforcing bars S to be attached. Further, since the reinforcing bar cage C and the spacer 1 can be separated and transported, the load does not become bulky on the transport vehicle.

Further, in the spacer 1 according to the embodiment described above, by processing one plate-like body, a portion of the space holding portion 10 excluding the end portion 14 on the main reinforcing bar S side and an inner wall contact portion 20 are formed. , Can be formed into a plate shape, which facilitates processing.

Further, in the spacer 1 according to the embodiment described above, the space holding portion 10 has a plurality of branch portions 11, 12, and 13 that branch from one location 21 of the inner wall contact portion 20 in a plurality of directions in a plan view. However, since the angle formed by the inner wall contact portion 20 and the branch portions 11, 12, 13 and the angle formed by the branch portions 11, 12, 13 can be changed, the mounting position on the main reinforcing bar S can be changed. It can be changed freely and can be transformed into a form with less resistance. Further, the number of spacers 1 to be used can be changed by changing the angle formed by the branch portions 11, 12, and 13.

Further, in the spacer 1 according to the embodiment described above, the end portion 14 on the main reinforcing bar S side of the space holding portion 10 can be attached to the main reinforcing bar S via the bolt 30, so that the attachment work is extremely easy. Become.

<Second embodiment>
Subsequently, the spacer 1A according to the second embodiment of the present invention will be described with reference to FIGS. 4 and 5. The spacer 1A according to the second embodiment is a modification of the configuration of the end portion 14 of the space holding portion 10 of the spacer 1 according to the first embodiment, and the other configurations are substantially the same as those of the first embodiment. is there. Therefore, in the present embodiment, the configuration different from that of the first embodiment will be mainly described, and the overlapping configurations will be designated by the same reference numerals as those of the first embodiment and detailed description thereof will be omitted.

The spacer 1A according to the present embodiment includes a space holding portion 10 and an inner wall contact portion 20 similar to the spacer 1 according to the first embodiment. The plate-shaped body constituting the space holding portion 10 and the inner wall contact portion 20 can be made of metal or the like as in the first embodiment, and the size and thickness of the plate-shaped body are the size of the spacer 1A to be formed. It can be set as appropriate according to.

As shown in FIG. 4, the end portion 14A on the main reinforcing bar S side of the space holding portion 10 in the present embodiment is formed in a Ω shape in a plan view. The inner diameter D of the end portion 14A is set to be substantially the same as the outer diameter of the main reinforcing bar of the reinforcing bar cage, and the main reinforcing bar is fitted into the inside of the end portion 14A. The end portion 14A can be made of a material having rigidity similar to the space holding portion 10, and is joined to the branch portions 11, 12, and 13 of the space holding portion 10 by welding or the like. Also in the present embodiment, the main reinforcing bar is prevented from coming off from the end portion 14A by mounting the bolt 30 from the outside in a state where the main reinforcing bar is fitted inside the end portion 14A. Since the bolt 30 is substantially the same as the first embodiment, detailed description thereof will be omitted.

When the spacer 1A according to the embodiment described above is adopted, the same effect as that of the first embodiment can be obtained.

<Third Embodiment>
Subsequently, the spacer 1B according to the third embodiment of the present invention will be described with reference to FIGS. 6 to 8. The spacer 1B according to the third embodiment is obtained by changing the configuration of the end portion 14 of the space holding portion 10 of the spacer 1 according to the first embodiment and adopting a non-welding means different from the bolt 30. The configuration of is substantially the same as that of the first embodiment. Therefore, in the present embodiment, the configuration different from that of the first embodiment will be mainly described, and the overlapping configurations will be designated by the same reference numerals as those of the first embodiment and detailed description thereof will be omitted.

The spacer 1B according to the present embodiment includes a space holding portion 10 and an inner wall contact portion 20 similar to the spacer 1 according to the first embodiment. The plate-shaped body constituting the space holding portion 10 and the inner wall contact portion 20 can be made of metal or the like as in the first embodiment, and the size and thickness of the plate-shaped body are the size of the spacer 1A to be formed. It can be set as appropriate according to.

As shown in FIG. 8, the end portion 14B of the space holding portion 10 on the main reinforcing bar S side has an opening type annular portion 40 having an elastic force at the end portion of the spacer holding portion 10 on the main reinforcing bar side. , The main reinforcing bar S can be fitted and attached from the opening 41 of the opening type annular portion 40. That is, the opening type annular portion 40 constitutes the non-welding means in the present invention. When the main reinforcing bar S is pushed into the opening 41, the opening type annular portion 40 is deformed and the opening 41 is opened. However, when the main reinforcing bar S passes through the opening 41, the shape of the opening type annular portion 40 is changed by elastic force. It returns to the original state, and finally, as shown in FIG. 8, the main reinforcing bar S is sandwiched by the opening type annular portion 40. By sandwiching the main reinforcing bar S with the elastic force of the opening type annular portion 40 in this way, the end portion of the spacer holding portion 10 on the main reinforcing bar S side can be attached to the main reinforcing bar S, so that the attachment work becomes extremely easy. ..

When a plurality of nodes (protruding portions) J are present in the main reinforcing bar S, it is preferable to arrange the opening type annular portion 40 between the nodes J and the nodes J as shown in FIG. By doing so, the sliding of the opening type annular portion 40 in the axial direction (direction A in FIG. 8) is prevented by the node J.

Further, in the present embodiment, as a retaining means for preventing the opening type annular portion 40 from coming off from the main reinforcing bar S, as shown in FIG. 8, slits 51a and 52a connected to the opening 41 of the opening type annular portion 40 A pair of plate portions 51 and 52 having the above and a plan-viewing dogleg-shaped plate member 60 having slits 61a and 62a are adopted. By inserting the slits 61a and 62a of the retaining plate member 60 into the slits 51a and 52a of the pair of plate portions 51 and 52 connected to the opening 41 of the opening type annular portion 40, the retaining plate member 60 is inserted into a pair. It can be locked to the plate portions 51 and 52, whereby it is possible to prevent the opening type annular portion 40 from coming off from the main reinforcing bar S. The retaining plate member 60 does not necessarily have to be in the shape of a plan view, and may adopt another shape (for example, an I-shape in a plan view (that is, a flat shape)).

When the spacer 1B according to the above-described embodiment is adopted, the same effect as that of the first embodiment can be obtained.

<Fourth Embodiment>
Subsequently, the spacer 1C according to the fourth embodiment of the present invention will be described with reference to FIGS. 9 and 10. The spacer 1C according to the fourth embodiment is a modification of the configuration of the end portion 14 of the space holding portion 10 of the spacer 1 according to the first embodiment, and the other configurations are substantially the same as those of the first embodiment. is there. Therefore, in the present embodiment, the configuration different from that of the first embodiment will be mainly described, and the overlapping configurations will be designated by the same reference numerals as those of the first embodiment and detailed description thereof will be omitted.

The spacer 1C according to the present embodiment includes a space holding portion 10 and an inner wall contact portion 20 similar to the spacer 1 according to the first embodiment. The plate-shaped body constituting the space holding portion 10 and the inner wall contact portion 20 can be made of metal or the like as in the first embodiment, and the size and thickness of the plate-shaped body are the size of the spacer 1C to be formed. It can be set as appropriate according to.

The end portion 14C on the main reinforcing bar side of the space holding portion 10 in the present embodiment is integrated with the space holding portion 10 and is formed in a U shape in a plan view as shown in FIG. That is, in the present embodiment, the space holding portion 10 including the end portion 14C on the main reinforcing bar side and the inner wall contact portion 20 are formed into a plate shape by processing one plate-like body. That is, two parallel cuts are made from one side of one plate-like body having a substantially rectangular shape, the plate-like body is bent at the ends of the cuts, and the opposite end is curved in a U shape. By doing so, as shown in FIG. 10, a plurality of branch portions 11, 12, 13 constituting the space holding portion 10, an inner wall contact portion 20, and an end portion 14C are formed. ..

The inner diameter D of the end portion 14C is set to be substantially the same as the outer diameter of the main reinforcing bar of the reinforcing bar cage, and the main reinforcing bar is fitted into the inside of the end portion 14C. Also in the present embodiment, the main reinforcing bar is prevented from coming off from the end portion 14C by mounting the bolt 30 from the outside in a state where the main reinforcing bar is fitted inside the end portion 14C. Since the bolt 30 is substantially the same as the first embodiment, detailed description thereof will be omitted.

By adopting the spacer 1C according to the embodiment described above, the same effect as that of the first embodiment can be obtained.

<Fifth Embodiment>
Subsequently, the spacer 1D according to the fifth embodiment of the present invention will be described with reference to FIGS. 11 and 12. The spacer 1D according to the fifth embodiment is a modification of the configuration of the end portion 14 of the space holding portion 10 of the spacer 1 according to the first embodiment, and the other configurations are substantially the same as those of the first embodiment. is there. Therefore, in the present embodiment, the configuration different from that of the first embodiment will be mainly described, and the overlapping configurations will be designated by the same reference numerals as those of the first embodiment and detailed description thereof will be omitted.

The spacer 1D according to the present embodiment includes a space holding portion 10 and an inner wall contact portion 20 similar to the spacer 1 according to the first embodiment. The plate-shaped body constituting the space holding portion 10 and the inner wall contact portion 20 can be made of metal or the like as in the first embodiment, and the size and thickness of the plate-shaped body are the size of the spacer 1D to be formed. It can be set as appropriate according to.

The end portion 14D on the main reinforcing bar side of the space holding portion 10 in the present embodiment is integrated with the space holding portion 10 and is formed in a Ω shape in a plan view as shown in FIG. That is, in the present embodiment, the space holding portion 10 including the end portion 14D on the main reinforcing bar side and the inner wall contact portion 20 are formed into a plate shape by processing one plate-like body. That is, two parallel cuts are made from one side of one plate-like body having a substantially rectangular shape, the plate-like body is bent at the end of the cut, and the opposite end is curved in an Ω shape. By doing so, as shown in FIG. 12, a plurality of branch portions 11, 12, 13 constituting the space holding portion 10, an inner wall contact portion 20, and an end portion 14D are formed. ..

The inner diameter D of the end portion 14D is set to be substantially the same as the outer diameter of the main reinforcing bar of the reinforcing bar cage, and the main reinforcing bar is fitted into the inside of the end portion 14D. Also in the present embodiment, the main reinforcing bar is prevented from coming off from the end portion 14D by mounting the bolt 30 from the outside in a state where the main reinforcing bar is fitted inside the end portion 14D. Since the bolt 30 is substantially the same as the first embodiment, detailed description thereof will be omitted.

By adopting the spacer 1D according to the embodiment described above, the same effect as that of the first embodiment can be obtained.

<Sixth Embodiment>
Subsequently, the spacer 1E according to the sixth embodiment of the present invention will be described with reference to FIGS. 13 to 15. The spacer 1E according to the sixth embodiment is a modification of the configuration of the space holding portion 10 of the spacer 1 according to the first embodiment, and the other configurations are substantially the same as those of the first embodiment. Therefore, in the present embodiment, the configuration different from that of the first embodiment will be mainly described, and the overlapping configurations will be designated by the same reference numerals as those of the first embodiment and detailed description thereof will be omitted.

The spacer 1E according to the present embodiment protrudes outward by a predetermined height in the radial direction of the reinforcing bar cage C (R direction in FIG. 15) from the main reinforcing bar S extending in the axial direction of the reinforcing bar cage C (direction A in FIG. 14). In addition, the space holding portion 10E configured to extend in the axial direction of the reinforcing bar cage C for a predetermined length and the end portion 15 of the space holding portion 10E opposite to the main reinforcing bar S are connected to the inner wall of the drilling hole. It includes an inner wall contact portion 20 configured to be in contact with the inner wall.

In the present embodiment, as shown in FIGS. 13 and 14, a portion of the space holding portion 10E excluding the end portion 14 on the main reinforcing bar S side and the inner wall contact portion 20 process a single plate-like body. As a result, it is formed in a plate shape. That is, as shown in FIG. 5, two parallel cuts are made from the two opposite sides of one plate-like body having a substantially rectangular shape, and the plate-like body is bent at the ends of the cuts. A plurality of extending portions 11E, 12E, 13E, 14E and an inner wall contact portion 20 forming the space holding portion 10E are formed therein.

The thus formed extended portion 11E, 12E, 13E, 14E are arranged along the axial direction A as shown in FIG. 14, in plan view, the inner wall contact portion 20 as shown in FIG. 13 It is configured to extend from the two locations 22 and 23 in different directions. That is, as shown in FIGS. 13 and 14, the extending portions 11E and 13E extending from one end 22 of the inner wall contact portion 20 and extending from the other end 23 of the inner wall contact portion 20. The extending portions 12E and 14E extend in different directions, and are attached to different main reinforcing bars S as shown in FIG. Further, the angle formed by the inner wall contact portion 20 and the extending portions 11E, 12E, 13E, 14E can be changed.

The plate-shaped body constituting the space holding portion 10E and the inner wall contact portion 20 can be made of metal as in the first embodiment, and the size and thickness of the plate-shaped body are adjusted to the size of the spacer 1E to be formed. It can be set as appropriate according to the situation. Further, since the configuration and the bolt 30 of the end portion 14 on the main reinforcing bar S side of the space holding portion 10E are substantially the same as those in the first embodiment, detailed description thereof will be omitted.

When the spacer 1E according to the embodiment described above is adopted, the same effect as that of the first embodiment can be obtained. In particular, the space holding portion 10E in the spacer 1E according to the present embodiment has a plurality of extending portions 11E, 12E, 13E extending in different directions from the two locations 22 and 23 of the inner wall contact portion 20 in a plan view. Since it has 14E and the angle formed by the inner wall contact portion 20 and the extending portions 11E, 12E, 13E, 14E can be changed, the mounting position to the main reinforcing bar S can be freely changed, and the resistance It can also be transformed into a form with less. Further, the number of spacers 1E to be used can be changed by changing the angle formed by the inner wall contact portion 20 and the extending portions 11E, 12E, 13E, 14E.

The present invention is not limited to each of the above embodiments, and those having a design modification appropriately made by those skilled in the art are also included in the scope of the present invention as long as they have the features of the present invention. To. That is, each element included in each of the above embodiments, its arrangement, material, condition, shape, size, and the like are not limited to those exemplified, and can be appropriately changed. In addition, the elements included in each of the above embodiments can be combined as much as technically possible, and the combination thereof is also included in the scope of the present invention as long as the features of the present invention are included.

1 ・ 1A ・ 1B ・ 1C ・ 1D ・ 1E… Spacer 10 ・ 10E… Spacer holding part 11 ・ 12 ・ 13… Branch part 11E ・ 12E ・ 13E ・ 14E… Extended part 14 ・ 14A ・ 14B ・ 14C ・ 14D… Main Reinforcing bar side end 15 ... End on the opposite side to the main reinforcing bar 20 ... Inner wall contact part 21 ... One place 22/23 ... Two places 30 ... Bolt (non-welding means)
40 ... Opening type annular portion (non-welding means)
51.52 ... Plate part (retaining means, non-welding means)
60 ... Retaining plate member (retaining means, non-welding means)
A ... Axial direction of the reinforcing bar cage C ... Reinforcing bar cage R ... Radial direction of the reinforcing bar cage S ... Main reinforcing bar

Claims (5)

A spacer attached to a reinforcing bar cage inserted into a drilling hole.
A space holding portion configured to project from the main reinforcing bar extending in the axial direction of the reinforcing bar cage by a predetermined height outward in the radial direction of the reinforcing bar cage and extending a predetermined length in the axial direction of the reinforcing bar cage. ,
The space holding portion is provided with an inner wall contact portion which is connected to an end portion of the space holding portion opposite to the main reinforcing bar and is configured to abut the inner wall of the excavation hole.
The end of the space holding portion on the main reinforcing bar side is configured to be attached to the plurality of main reinforcing bars via non-welding means.
At the end of the spacer holding portion on the main reinforcing bar side, an opening type annular portion configured to sandwich the main reinforcing bar by elastic force is provided.
The non-welding means is a spacer having the opening type annular portion and the retaining means for preventing the opening type annular portion from coming off from the main reinforcing bar. The spacer according to claim 1, wherein the portion of the space holding portion excluding the end on the main reinforcing bar side and the inner wall contact portion are formed into a plate shape by processing a single plate-like body. .. The spacer according to claim 1, wherein the space holding portion including the end portion on the main reinforcing bar side and the inner wall contact portion are formed in a plate shape by processing a single plate-like body. Before Symbol space holding portion has a plurality of branch portions branching into a plurality of directions from a central location of the inner wall abutment in a plan view,
The spacer according to any one of claims 1 to 3 , wherein the angle formed by the inner wall contact portion and the branch portion and the angle formed by the branch portions can be changed. Before Symbol space holding portion has a plurality of extending portions which extend to respective different directions from the two points of the inner wall abutment in a plan view,
The spacer according to any one of claims 1 to 3, wherein the angle formed by the inner wall contact portion and the extending portion can be changed.