JP2021017691A - Joint structure of cylindrical structural body and joint method - Google Patents

Abstract

To provide a joint structure easily realizing a rigid structure without damaging its appearance when jointing cylindrical bodies to each other.SOLUTION: A joint structure of cylindrical joint structural bodies jointing one end 1a of one cylindrical body 1 and one end 20a of the other cylindrical body 20 is provided with: an intermediate member 10 placed over an inner side of the cylindrical body 1 and an inner side of the cylindrical body 20; and filler M filled in a first gap A between inner surfaces of the cylindrical body 1 and the other cylindrical body 20 and an outer surface of the intermediate member 10.SELECTED DRAWING: Figure 1

Description

The present invention relates to a joining structure of various tubular structures such as columns and a joining method thereof.

Conventional technology

Generally, in streets, parks and other various facilities, tubular structures (pillar structures) consisting of various poles such as lighting pillars with lighting at the top, sign pillars with signs at the top, guard rails, etc. are installed. Ru. These tubular structures are made of metal, and the metal tubular members are fixed so as to stand up from a foundation such as concrete buried in the ground.

When a tubular structure has been used for many years, the specifications and uses of the equipment may change due to changes in the surrounding environment and the practical application of new technologies. For example, when the tubular structure is a lighting column, the lighting equipment thereof may be changed from a mercury lamp to an LED system. In the case of such changes in specifications and uses, it may be necessary to rebuild the tubular structure.
Further, since the member at the base of the tubular structure is easily corroded by the retention of rainwater, animal excrement, etc., it may be necessary to rebuild the tubular structure when the member is corroded. Further, there may be a case where the tubular structure has to be rebuilt due to bending or the like due to a collision of a vehicle or the like, such as a sign pillar or a lighting pillar.

In the case of such rebuilding, the concrete of the existing foundation is crushed to remove all the existing tubular structure embedded in the foundation, and then a new concrete foundation is placed to create a new tubular structure. The method of raising the body is common. However, crushing such a foundation and removing an existing tubular structure are laborious and time-consuming tasks, and also generate a large amount of waste. Moreover, in the case of such rebuilding, the foundation and the members embedded in the foundation are often sound.

Therefore, for example, Patent Documents 1 to 3 disclose various construction methods for starting up a new tubular structure by using an existing foundation or a part of the existing tubular structure. Further, as an example in which the columns in a building are composed of a tubular structure, for example, there is one described in Patent Document 4.

JP-A-2018-178704 Japanese Unexamined Patent Publication No. 2001-3602 JP-A-2018-155080 Japanese Unexamined Patent Publication No. 9-13512

However, in the invention described in Patent Document 1, since the method is to insert a new tubular structure inside the existing tubular structure, the diameter of the column of the new tubular structure is larger than that of the conventional one. There is a problem that it is limited to small ones. On the contrary, in the invention described in Patent Document 2, there is a problem that the new tubular structure is limited to those having a column diameter larger than that of the conventional one.

Further, in the invention described in Patent Document 3, as in Patent Document 2, the diameter of the pillar of the new tubular structure is larger than that of the prior art. Further, the new tubular structure described in Patent Document 3 includes a steel pipe split body that rises on the ground and a new steel pipe column that is connected to the upper portion by bolts. Since the steel pipe split body and the steel pipe column are connected by a flange, there is a problem that the protrusion of the flange impairs the aesthetic appearance. Further, in order to increase the connection strength between the steel pipe split body and the steel pipe column, there is also a problem that the flanges and bolts become large. Further, in the invention described in Patent Document 4, since the total length of the pillar is a double cylinder structure, there is a problem that the members become large and the alignment work between the members is complicated.

Therefore, an object of the present invention is to easily realize a strong structure without spoiling the aesthetic appearance when joining the tubular bodies to each other.

In order to solve the above problems, the present invention has a joint structure of a tubular structure that joins one end of one tubular body and the other end of another tubular body, and the inside of the one tubular body. An intermediate member arranged straddling the inside of the other tubular body, an inner surface of the one tubular body, an inner surface of the other tubular body, and an outer surface of the intermediate member. A joint structure of a tubular structure including a filler filled in one gap was adopted.

Here, it is possible to adopt a configuration including a guide member fixed to the outer surface of the intermediate member and aligning the axis of the one tubular body with the axis of the other tubular body.

Further, a packing for suppressing leakage of the filler is arranged between at least one of the inner surface of the one tubular body and the inner surface of the other tubular body and the outer surface of the intermediate member. Can be adopted.

In each of these embodiments, a tubular root-wrapping member arranged across the outside of the one tubular body and the outside of the other tubular body is provided, and the outer surface of the one tubular body and the other It is possible to adopt a configuration in which the filler is filled in the second gap interposed between the outer surface of the tubular body and the inner surface of the root winding member.

Further, in each of these aspects, it is possible to adopt a configuration in which the outer diameter of the one tubular body and the other tubular body are the same.

Further, in order to solve the above problems, the present invention relates to a method for joining a tubular structure in which one end of one tubular body and the other end of another tubular body are joined, wherein the one tubular body is joined. A step of inserting an intermediate member into the inside of the mold, a step of fixing a tubular mold member protruding from one end of the one tubular body to the outside of the one tubular body, and a step of fixing the tubular mold member to the inside of the mold member. And a step of inserting the other tubular body inside the mold member and abutting the other end of the other tubular body with one end of the one tubular body. A method of joining a tubular structure including a step of curing the filler was adopted.

Here, the one tubular body can adopt a configuration in which a part of the existing tubular structure is removed and remains.

Further, the other tubular body is abutted against one end of the one tubular body via a guide member, and the guide member is the axial center of the one tubular body and the axial center of the other tubular body. It is possible to adopt a configuration having a function of aligning with and.

In each of these embodiments, a tubular root-wrapping member is arranged straddling the outside of the one tubular body and the outside of the other tubular body, and the outer surface of the one tubular body and the other tubular body are arranged. It is possible to adopt a configuration in which the filler is filled in the second gap interposed between the outer surface of the body and the inner surface of the root winding member.

According to the present invention, when joining tubular bodies to each other, a strong structure can be easily realized without spoiling the aesthetic appearance.

An embodiment of the present invention is shown, (a) is a partially cut disassembled perspective view, and (b) is a perspective view of an intermediate member and a guide member. The main part of the embodiment is shown, (a) is a plan view, and (b) is a front view. Explanatory drawing which shows the construction method of the tubular structure of the same embodiment Explanatory drawing which shows the construction method of the tubular structure of the same embodiment Explanatory drawing which shows the construction method of the tubular structure of the same embodiment Explanatory drawing which shows the construction method of the tubular structure of the same embodiment Explanatory drawing which shows the construction method of the tubular structure of the same embodiment Explanatory drawing which shows the construction method of the tubular structure of the same embodiment Explanatory drawing which shows the construction method of the tubular structure of the same embodiment Explanatory drawing which shows the construction method of the tubular structure of the same embodiment Explanatory drawing which shows the construction method of the tubular structure of the same embodiment Explanatory drawing which shows the construction method of the tubular structure of the same embodiment Explanatory drawing which shows the construction method of the tubular structure of the same embodiment Explanatory drawing which shows the construction method of the tubular structure of the same embodiment Explanatory drawing which shows the construction method of the tubular structure of the same embodiment Explanatory drawing which shows the construction method of the tubular structure of the same embodiment Explanatory drawing which shows the construction method of the tubular structure of another embodiment Explanatory drawing which shows the construction method of the tubular structure of still another embodiment Explanatory drawing which shows the construction method of the tubular structure of still another embodiment Explanatory drawing which shows the construction method of the tubular structure of still another embodiment Explanatory drawing which shows the support method using a support device

An embodiment of the present invention will be described with reference to FIGS. 1 to 4. In each of the following embodiments, an existing tubular structure (lighting pillar, sign pillar, etc.) provided in a street, a park, or various other facilities is replaced with another new tubular structure (lighting pillar, sign pillar, etc.). It is a construction method of a tubular structure at the time of rebuilding, and a structure of a tubular structure constructed by the construction method.

FIG. 1 shows a state when a tubular structure according to an embodiment of the present invention is constructed, and FIGS. 2 (a) and 2 (b) show the main parts thereof. 3A to 3G and 4A to 4G show the procedure of the construction method of the same embodiment, respectively. As shown in FIG. 3A, the existing tubular structure is mainly composed of a metal tubular member. The metal tubular member is embedded in a concrete foundation G cast on the ground, and is fixed so as to rise upward from the foundation G.

First, as shown in FIG. 3A, a step of cutting a part 2 of an existing tubular structure (hereinafter, referred to as an upper portion 2 in this embodiment) with a tool 3 such as a cutting machine and removing the upper portion 2. To carry out. The cutting is performed so as to leave the portion of the existing tubular structure 1 embedded in the foundation G and remove the upper portion 2 above the portion. The cutting position may be flush with the upper surface of the foundation G, but the cutting position may be slightly above the upper surface of the foundation G in order to suppress contact of rainwater with the new tubular structure. The portion indicated by the chain line in FIG. 3A is the upper portion 2 to be removed. FIG. 4A is a plan view of FIG. 3A. If the cut end of the cut portion is not horizontal or is deformed, correct it as necessary.

Subsequently, a step of inserting the intermediate member 10 into the existing tubular structure (hereinafter, referred to as one tubular body 1 or the existing tubular body 1) remaining on the foundation G side is carried out. The intermediate member 10 is also made of a metal tubular member, but it may be made of a solid steel rod or the like.

A guide member 30 is fixed to the intermediate member 10 in advance. As shown in FIGS. 1 and 2 (a) and 2 (b), the guide member 30 is composed of a ring-shaped plate-shaped member. As a method of fixing the guide member 30, for example, press-fitting of the member to the outer surface of the intermediate member 10, welding, or other methods can be adopted, but in this embodiment, the fixing method by welding is adopted.

Since the guide member 30 is fixed in advance in the middle of the intermediate member 10 in the axial direction, when the intermediate member 10 is inserted into the existing tubular body 1, the guide member 30 is attached to the upper end 1a of the existing tubular body 1. By abutting, the stopper function can be exerted. The guide member 30 may be separated from the intermediate member 10 and inserted into the existing tubular body 1 in the order of the guide member 30 and the intermediate member 10. Further, depending on the specifications, the guide member 30 may be omitted as appropriate.

As shown in FIG. 3B, the intermediate member 10 and the guide member 30 are inserted by inserting the lower end 10b of the intermediate member 10 having a relatively small diameter inside the existing tubular body 1 having a relatively large diameter. Do. FIG. 4B is a plan view of FIG. 3B.

Here, as shown in FIG. 1, a first gap A having a predetermined size is interposed between the inner surface of the existing tubular body 1 and the outer surface of the intermediate member 10. Further, a packing 11 is arranged between the inner surface of the existing tubular body 1 and the outer surface of the intermediate member 10 near the lower end 10b of the intermediate member 10. The packing 11 is provided over the entire circumference, and has a function of suppressing downward leakage of the filler M filled between the inner surface of the existing tubular body 1 and the outer surface of the intermediate member 10 in a step described later. , Has a centering function of the intermediate member 10. It is desirable that the packing 11 is arranged near the lower end of the intermediate member 10. Further, if the packing 11 is fixed to the outer surface of the intermediate member 10 in advance by adhesion or the like, the construction is easy. If the packing 11 is stretched between the inner surface of the existing tubular body 1 and the outer surface of the intermediate member 10, the intermediate member 10 can be held so as not to fall deep into the ground.

Next, as shown in FIG. 3C, a step of arranging the tubular root winding member 40 on the outside of the existing tubular body 1 is carried out. The lower end 40b of the root winding member 40 is placed on the foundation G, and the upper end 40a thereof extends further above the one end 1a (hereinafter, referred to as the upper end 1a) which is the cutting side of the existing tubular body 1. I'm standing up. FIG. 4C is a plan view of FIG. 3C. The root winding member 40 may be omitted as appropriate depending on the specifications.

Then, as shown in FIG. 3D, a step of arranging the tubular formwork member 50 on the outer side of the existing tubular body 1 and the root winding member 40 is carried out. The formwork member 50 projects upward from the upper end 1a of the existing tubular body 1 and the upper end 10a of the intermediate member 10. The formwork member 50 has a structure in which the formwork member 50 is divided into a plurality of members along the circumferential direction. As shown in FIG. 4D, the formwork member 50 of this embodiment has a structure divided into two. FIG. 4D is a plan view of FIG. 3D. The inner surface of the formwork member 50 is coated with silicon, Teflon or the like so as to be slippery.

As shown in FIG. 1, the lower end 50d of the formwork member 50 is placed on the foundation G, and the upper end 50c of the formwork member 50 rises further above the upper end 10a of the intermediate member 10. Further, the formwork member 50 includes a lower inner surface 50b that contacts the outer surface of the root winding member 40 and an upper inner surface 50a that projects inward from the lower inner surface 50b. A step portion 50e is formed between the lower inner surface 50b and the upper inner surface 50a. In this embodiment, the lower inner surface 50b is in surface contact with the entire outer surface of the intermediate member 10, but the lower inner surface 50b is in contact with only a part of the outer surface of the intermediate member 10 as long as the intermediate member 10 can be held. It may be in the form of Further, the upper inner surface 50a is also preferably configured to be in surface contact with the entire outer surface of the new tubular body 20 described later, but may be in contact with only a part of the outer surface of the new tubular body 20.

The formwork member 50 is fixed to the foundation G by the support member 60. As shown in FIGS. 3D and 4D, the support member 60 penetrates the substrate portion 61 having a plate surface parallel to the upper surface of the foundation G, the plurality of rib portions 62 rising from the substrate portion 61, and the substrate portion 61. It is provided with a bolt 63 whose tip abuts on the surface of the foundation G, a tubular portion 66 along the outer surface of the formwork member 50, and the like. The lower end of the tubular portion 66 is in contact with the upper surface of the foundation G. Further, by adjusting the screwing amount of the bolt 63, the height of the substrate portion 61 and the vertical state of the tubular portion 66 can be adjusted. Since the substrate portion 61 and the tubular portion 66 have the same halved structure as the form member 50, they can be easily attached and detached. The tubular portion 66 and the formwork member 50 may be integrally fixed in advance.

Then, the step of filling the filler M inside the formwork member 50 is carried out. As shown in FIG. 3E, the filler M poured into the inside of the formwork member 50 passes through the gap around the guide member 30 and is between the inner surface of the existing tubular body 1 and the outer surface of the intermediate member 10. It enters the intervening first gap A (see FIG. 1) and also enters the second gap B (see FIG. 1) intervening between the outer surface of the existing tubular body 1 and the inner surface of the root winding member 40. .. As the filler M, a material that does not shrink during curing, particularly a super fast-hardening non-shrink mortar is preferable, but a general non-shrink mortar may also be used. Alternatively, various other materials such as mortar may be used as long as they allow shrinkage and expansion during curing. FIG. 4E is a plan view of FIG. 3E.

A step of inserting a new tubular structure (hereinafter, referred to as another tubular body 20 or a new tubular body 20) different from the existing tubular structure is carried out inside the formwork member 50. (See the arrow in FIG. 3E). The new tubular body 20 is abutted against the upper end 1a of the existing tubular body 1 via the guide member 30. As a result, the load of the new tubular body 20 is transmitted to the upper end 1a of the existing tubular body 1. If the guide member 30 is interposed between the existing tubular body 1 and the new tubular body 20, the positions of the upper end 1a of the existing tubular body 1 and the lower end 20a of the new tubular body 20 will be the axial center o. Mutual load transmission is possible even if there is a slight deviation in the radial direction of the center. For this reason, sufficient strength can be exhibited even when there is some misalignment or even between tubular bodies having different inner and outer diameters.

Further, the guide member 30 of this embodiment has a function of aligning the axial center o of the existing tubular body 1 and the axial center o of the new tubular body 20. As shown in FIG. 2, the guide member 30 includes a ring-shaped main body portion 31, an outer centering portion 33 projecting outward from the main body portion 31, and an inner centering portion projecting inward from the main body portion 31. 32 is provided. The outer edge of the outer centering portion 33 is in contact with the inner surface of the root winding member 40, and the inner edge of the inner centering portion 32 is in contact with (or is welded to) the outer surface of the intermediate member 10. The member 40 and the intermediate member 10 are aligned. Further, the guide member 30 includes a first alignment piece 34 that rises to the existing tubular body 1 side (downward) and a second alignment piece 35 that rises to the new tubular body 20 side (upward). The inner surface of the first alignment piece 34 abuts on the outer surface of the existing tubular body 1, and the inner surface of the second alignment piece 35 abuts on the outer surface of the new tubular body 20, so that the guide member 30 is already installed. The tubular body 1 and the new tubular body 20 can be aligned. As a result, even if the upper end 1a of the existing tubular body 1 is deformed, the deviation of the axial center o from the new tubular body 20 can be suppressed. The first alignment piece 34 and the second alignment piece 35 can be formed so as to stand up in a predetermined direction by, for example, bending a plate-shaped member constituting the guide member 30.

It is desirable that the new tubular body 20 is inserted immediately after the filler M is filled. At this time, as shown in FIG. 2B, the lower end 20a of the new tubular body 20 is processed into a tapered shape (acute-angled tip), so that the filler M guides the new tubular body 20. It is possible to prevent the member from being caught between the member 30 and the member 30. Further, the overflowing filler M falls inside the hollow intermediate member 10. Even if the lower end 20a of the new tubular body 20 has a sharp shape, the compressive force due to the load of the new tubular body 20 is propagated to the existing tubular body 1 via the filler M. Here, the sharp lower end 20a is a ridgeline portion formed by an outer surface of the new tubular body 20 and a tapered surface 20b that is inclined toward the upper end side toward the axial center o side.

In this embodiment, the existing tubular body 1 and the new tubular body 20 have the same inner diameter. Therefore, as shown in FIG. 1, a first gap A having the same predetermined dimensions as described above is interposed between the inner surface of the new tubular body 20 and the outer surface of the intermediate member 10. .. In this embodiment, the existing tubular body 1 and the new tubular body 20 have the same outer diameter. However, even if the inner diameter of the existing tubular body 1 and the inner diameter of the new tubular body 20 or the outer diameter of the existing tubular body 1 and the outer diameter of the new tubular body 20 are different from each other, the above configuration is adopted. can do. As described above, when the inner and outer diameters of the tubular bodies are different, it is desirable to interpose the guide member 30 between the two as described above.

Next, the step of curing the filler M is carried out in the state of FIG. 3F. Curing of the filler M is possible in about one hour if it is a super fast-hardening non-shrink mortar. After the mortar is cured, as shown in FIG. 3G, the mold member 50 is removed, and the excess filler M adhering to the surroundings is removed to complete all the steps. Since the inner surface of the formwork member 50 is coated with silicon, Teflon or the like in a slippery manner, it can be easily separated from the filler M and other members. 4F and 4G are plan views of FIGS. 3F and 3G, respectively.

Here, since the root wrapping member 40 is in a state of straddling the existing tubular body 1 and the new tubular body 20, the existing tubular body 1 and the new tubular body 20 are made stronger through the filler M. Can be fixed. Further, since the cut surface of the upper end 1a of the existing tubular body 1 is not rust-proofed, the cut surface can be protected by the filler M filled inside the root winding member 40 to prevent the occurrence of rust. it can. It is desirable that the root wrapping member 40 is subjected to a rust preventive treatment such as plating.

As shown in FIGS. 1 and 3G, the tubular structure constructed by the above joining method includes an intermediate member 10 arranged so as to straddle the inside of the existing tubular body 1 and the inside of the new tubular body 20. , A guide member 30 fixed to the outer surface of the intermediate member 10 to align the axial center of the existing tubular body 1 and the axial center of the new tubular body 20, and the inner surface of the existing tubular body 1 and the new tubular body 20. It constitutes a joint structure including a filler M filled between the inner surface and the outer surface of the intermediate member 10.

In the joint structure of the tubular structure, the outer surface of the intermediate member 10 has a first gap A interposed between the inner surface of the existing tubular body 1 and the inner surface of the new tubular body 20, and the first gap A thereof. A is filled with a filler M. Further, a packing 11 for suppressing leakage of the filler M is arranged between the inner surface of the existing tubular body 1 and the outer surface of the intermediate member 10.

In this embodiment, the packing 11 is arranged only between the inner surface of the existing tubular body 1 and the outer surface of the intermediate member 10, but also between the inner surface of the new tubular body 20 and the outer surface of the intermediate member 10. The packing 11 may be arranged. In particular, when the tubular structure to be constructed is oriented in a direction other than the vertical direction, for example, when it is constructed in the horizontal or diagonal direction, it is effective to provide packings 11 at both ends in the axial direction of the intermediate member 10 in this way. Is. Further, in the case where the packing 11 is provided only at one end of the intermediate member 10 in the axial direction, a spacing member for adjusting the axial center can be arranged on the outer surface of the other end of the intermediate member 10 in the axial direction. The spacing members do not necessarily have to be continuous over the entire circumference of the axial center, and it is sufficient if they are provided intermittently at a plurality of locations along the axial center circumference.

Further, in the joint structure of this tubular structure, a tubular root winding member 40 arranged so as to straddle the outside of the existing tubular body 1 and the outside of the new tubular body 20 is provided, and the outer surface of the existing tubular body 1 is provided. The second gap B interposed between the outer surface of the new tubular body 20 and the inner surface of the root winding member 40 is also filled with the filler M.

Other embodiments are shown in FIGS. 5 (a) to 5 (e). In this embodiment, the installation of the guide member 30 and the root winding member 40 in the above-described embodiment is omitted. The support member 60 that supports the formwork member 50 is not shown. Since other procedures and structures are common, the description thereof will be omitted. It is possible to add the guide member 30 or the root winding member 40 to the embodiment shown in FIG.

Yet another embodiment is shown in FIG. In each of the above embodiments, the procedure is to fill the inside of the mold member 50 with the filler M and then insert the new tubular body 20, but instead of this procedure, as shown in FIG. 5, the mold Before filling the inside of the member 50 with the filler M, the new tubular body 20 may be inserted inside the formwork member 50, and then the filler M may be filled inside the new tubular body 20. At this time, the filler M uses, for example, a through hole formed in the side surface of the new tubular body 20 or the side surface of the existing tubular body 1 as an injection port E (not shown in FIG. 6) as the injection port. It can be poured into the inside through E, but when the height of the new tubular body 20 is low as in this embodiment, the upper end of the new tubular body 20 in the tubular axial direction is open, so that the upper end of the new tubular body 20 is open. It may be poured through the opening. When a new tubular body 20 having a large diameter is used, or when a new tubular body 20 having a short height such as a support of a guardrail is used, it is relatively easy to add the filler M. The construction method can also be adopted.

Further, the form of the injection port E may be, for example, the one shown in FIG. In particular, when a tall new tubular body 20 such as an illumination column is used, an injection port E that penetrates the new tubular body 20 inside and outside is provided, and the filler M is charged through the injection port E. Is convenient. In FIG. 7, an injection port E penetrating inside and outside is provided in the middle of the new tubular body 20 in the axial direction. This inlet E utilizes a maintenance opening of a power supply facility for lighting equipment. When such an injection port E can be secured, the existing tubular body 1 and the new tubular body 20 are butted against each other, and then a hose or the like is inserted between the intermediate member 10 and the new tubular body 20. It is possible to fill the filler M inside through a hose. In FIG. 7, the formwork member 50 is composed of an outer surface of the existing tubular body 1 and a band or the like that is in close contact with the outer surface of the new tubular body 20. It is desirable that the formwork member 50 in close contact with the existing tubular body 1 and the new tubular body 20 in this embodiment remains without being removed after the filler M is cured.

Yet another embodiment is shown in FIG. In this embodiment, assuming a case where the tubular structure is oriented sideways like a sewer pipe or the like, the existing tubular body 1 and the new tubular body 20 are joined in a horizontal state (horizontal state or inclined state). is there. In this way, when the existing tubular body 1 and the new tubular body 20 are oriented sideways, the injection port E of the filler M is directed downward near one end in the axial direction of the intermediate member 10 and near the other end. It is effective to fill the gap by providing the exhaust port F upward and injecting the filler M after abutting the existing tubular body 1 and the new tubular body 20. In this case, it is desirable that the packings 11 and 12 for preventing the leakage of the filler M are arranged at both ends in the axial direction of the intermediate member 10.

9 (a) and 9 (b) are explanatory views showing a construction method using the support device 70 when the new tubular body 20 is installed so as to stand up from the foundation G. The support device 70 includes a plurality of leg portions 71 (three leg portions 71 in the example of the figure), a support portion 72 that hinges the upper ends of the plurality of leg portions 71, and a rising portion 73 provided on the support portion 72. A clamp portion 74 or the like provided on the rising portion 73 is provided. The leg portion 71 can rotate around the hinge axis with respect to the support portion 72, and the lower end of the leg portion 71 can be opened and closed by the rotation. The clamp portion 74 is composed of an annular member, and its inner diameter is expanded or contracted by loosening the adjusting bolt 75. The adjusting bolt 75 is tightened, the outer circumference of the new tubular body 20 is held by the clamp portion 74, and the new tubular body 20 is positioned directly above the mold member 50. At this time, it is assumed that the intermediate member 10 and other members have already been constructed. While slightly loosening the adjusting bolt 75, the new tubular body 20 is supported by hand, and the lower end 20a of the new tubular body 20 is made to penetrate into the mold member 50. Then, the filler M is filled, and after the filler M is cured, the support device 70 is removed.

The support device 70 of FIG. 9 is an example, and other support devices 70 can be used. Further, in the case of a new tubular body 20 having a relatively short length, such as a support of a guardrail, an operator manually lifts the new tubular body 20 without using such a support device 70. It can be installed.

As described above, in the present invention, the existing tubular body 1 and the new tubular body 20 are integrated via the intermediate member 10 and the filler M. As a result, in the conventional structure as in Patent Documents 1 and 2, the acting force was resisted only by the inner tubular body, whereas in the present invention, in addition to the intermediate member 10 (inner tubular body), the existing one is installed. Since the compressed portion of the tubular body 1 and the new tubular body 20 (outer tubular body) and the filler M can also resist the acting force, the joint portion thereof is equal to or greater than the yield strength of the intermediate member 10 (inner tubular body). There is an advantage that the proof stress can be secured.

Further, in the present invention, since fire such as welding is not used, the work is easy and safe. In addition, since there are no protrusions such as flanges on the outer surface of the tubular body, it is aesthetically pleasing. Further, if a tubular member is adopted as the intermediate member 10, a space can be secured inside the tubular body after connection, so that it can be used for wiring of electric wires and transportation of liquids and gases. If a tubular member (steel pipe) is used as the intermediate member 10, special processing is not required and construction can be performed at low cost.

In this embodiment, one tubular structure 1 (existing tubular body 1), an intermediate member 10, another tubular structure 20 (new tubular body 20), a guide member 30, a root winding member 40, and a formwork. Although the members 50 and the like are each made of metal, a material other than metal, for example, a material made of carbon fiber, resin, or the like may be used for a part or all of them as long as the strength and durability can be ensured. Further, the installation position of the root wrapping member 40 is not limited to the position in contact with the upper surface of the foundation G as in the above embodiment, and there is a gap between the lower end 40b of the root wrapping member 40 and the upper surface of the foundation G. It may be a position.

In the above embodiment, one tubular structure 1 (existing tubular body 1), an intermediate member 10, and another tubular structure 20 (new tubular body 20) have circular cross sections, but these are cross-sections. Other cross-sectional shapes, such as a quadrangle, are also possible. Further, in the present invention, in addition to various pillars such as lighting pillars and sign pillars, for example, pillars and beams of building structures, wiring pipes for cables such as electric wires, various fluid transport pipes for liquids and gases, etc. Is also available.

1 One tubular body (existing tubular body)
10 Intermediate member 11 Packing 20 Another tubular body (new tubular body)
30 Guide member 40 Root winding member 50 Formwork member 60 Support member 70 Support device A First gap B Second gap E Injection port G Foundation M Filler

Claims (9)

In the joining structure of a tubular structure that joins one end (1a) of one tubular body (1) and the other end (20a) of another tubular body (20).
An intermediate member (10) arranged so as to straddle the inside of the one tubular body (1) and the inside of the other tubular body (20).
Filling in the first gap (A) interposed between the inner surface of the one tubular body (1) and the inner surface of the other tubular body (20) and the outer surface of the intermediate member (10). Material (M) and
A joint structure of a tubular structure comprising. A claim that includes a guide member (30) that is fixed to the outer surface of the intermediate member (10) and aligns the axis of the one tubular body (1) with the axis of the other tubular body (20). The joint structure of the tubular structure according to 1. Leakage of the filler (M) between at least one of the inner surface of the one tubular body (1) and the inner surface of the other tubular body (20) and the outer surface of the intermediate member (10). The joint structure of the tubular structure according to claim 1 or 2, wherein the packing (11) to be suppressed is arranged. A tubular root wrapping member (40) arranged so as to straddle the outside of the one tubular body (1) and the outside of the other tubular body (20) is provided.
The filler is formed in a second gap (B) interposed between the outer surface of the one tubular body (1) and the outer surface of the other tubular body (20) and the inner surface of the root winding member (40). The joint structure of the tubular structure according to any one of claims 1 to 3, which is filled with (M). The joint structure of the tubular structure according to any one of claims 1 to 4, wherein the one tubular body (1) and the other tubular body (20) have the same outer diameter. In the method of joining a tubular structure for joining one end (1a) of the tubular body (1) and the other end (20a) of another tubular body (20).
The step of inserting the intermediate member (10) into the inside of the one tubular body (1), and
A step of fixing a tubular formwork member (50) protruding from one end (1a) of the one tubular body (1) to the outside of the one tubular body (1).
The step of filling the filler (M) inside the mold member (50) and the one tubular body (1) by inserting the other tubular body (20) inside the mold member (50). ), And the other end (20a) of the other tubular body (20) is abutted against one end (1a).
The step of curing the filler (M) and
A method of joining a tubular structure comprising. The method for joining a tubular structure according to claim 6, wherein the one tubular body (1) is a portion remaining after removing a part (2) of the existing tubular structure. The other tubular body (20) is abutted against one end (1a) of the one tubular body (1) via a guide member (30).
The cylinder according to claim 6 or 7, wherein the guide member (30) has a function of aligning the axis of the one tubular body (1) with the axis of the other tubular body (20). A method of joining shaped structures. A tubular root wrapping member (40) is arranged so as to straddle the outside of the one tubular body (1) and the outside of the other tubular body (20).
The filler is formed in a second gap (B) interposed between the outer surface of the one tubular body (1) and the outer surface of the other tubular body (20) and the inner surface of the root winding member (40). The method for joining a tubular structure according to any one of claims 6 to 8, wherein (M) is filled.

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