JP7288407B2 - Prefabricated concrete column and its assembly method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prefabricated concrete pillar provided with joint pipes for connecting a plurality of concrete pillars , and a method for assembling the same .

Conventionally, when a plurality of concrete pillars are connected and assembled as one concrete pillar, the lower end of the upper pillar and the upper end of the lower pillar are butted to form a continuous tapered shape. (see, for example, Patent Document 1), the joint steel pipe is integrally provided at the lower end of the upper pillar, and this joint steel pipe is fitted to the tapered portion at the upper end of the lower pillar. (for example, see Patent Documents 2 and 3), and a combination shape is provided at the opposing ends of the upper and lower columns, and the periphery is reinforced with a steel pipe (for example, see Patent Documents 4 and 5), respectively. Are known.

JP 2014-1595 A JP 2016-153598 A JP 2019-19525 A JP 2008-101327 A JP 2008-240367 A

In the configuration of Patent Document 1, although the joint structure is simple, it is necessary to form the steel pipe for the joint into a taper shape that is substantially the same as the taper shape of the lower end portion of the upper column and the upper end portion of the lower column. is difficult and expensive. In addition, since the joint steel pipe is tapered, in order to attach the joint steel pipe to the lower end of the upper pillar, the joint steel pipe must be fitted from the upper end of the upper pillar and slid to the lower end of the upper pillar. must. At that time, it is necessary to raise and lower the upper column with a crane or the like.

In addition, in the configurations of Patent Documents 2 and 3, it is necessary to integrally provide the joint steel pipe with the lower end of the upper pillar. The production process of the upper pillar is complicated, such as locking and tensioning the steel materials placed in the pillar. In addition, the height of the concrete column after assembly may vary from product to product due to the dimensional accuracy of the joint steel pipe and the tapered portion at the upper end of the lower column.

Furthermore, in the configurations of Patent Documents 4 and 5, it is necessary to form a shape in which the lower end portion of the upper pillar and the upper end portion of the lower pillar are combined with each other. The shape of the formwork is complicated and expensive.

As described above, there is a demand for joints that connect a plurality of columns, and that can be easily connected without the need for special processing at the ends of the columns that are connected by the joints.

The present invention has been devised in view of these points, and is a prefabricated concrete pillar and a prefabricated concrete pillar provided with joint pipes that can be manufactured at a low cost and can be easily connected to a plurality of pillars without processing them. and its assembly method.

A prefabricated concrete column according to claim 1 is a joint pipe for connecting a plurality of concrete columns, comprising a cylindrical joint pipe body into which the column is inserted from both ends, and the joint pipe body. a seat plate portion formed in a direction intersecting the axial direction of the joint pipe main body portion with respect to the joint pipe main body portion for regulating the insertion position of each of the columns into the joint pipe main body portion; However, a joint pipe having substantially constant inner diameters on one end side and the other end side with respect to the seat plate portion, and a concrete one whose end is inserted into one end side of the joint pipe main body portion of the joint pipe a column, another column made of concrete whose end is inserted into the other end of the joint pipe main body of the joint pipe, an end of the one column and the joint pipe main body of the joint pipe a retaining portion for retaining the end of the one column with respect to the joint pipe main body by being interposed in a gap between the joint pipe and the joint pipe between the end of the other column and the joint pipe; another retaining portion that is interposed in a gap with the main body portion and retains the end portion of the other column body from the joint pipe main body portion, wherein the one and the other retaining portions have a central axis; It has a contact portion that is fixed in contact with each of the outer surface of the first and other columns and the inner surface of the joint pipe main body portion of the joint pipe when viewed in a vertical cross section passing through.

The prefabricated concrete pillar according to claim 2 is the prefabricated concrete pillar according to claim 1, wherein the inner diameter of the joint pipe body is substantially the same on the one end side and the other end side of the seat plate part. .

A prefabricated concrete column according to claim 3 is the prefabricated concrete column according to claim 1, wherein the inner diameter of the joint pipe body differs between the one end side and the other end side of the seat plate portion.

The prefabricated concrete column according to claim 4 is the prefabricated concrete column according to any one of claims 1 to 3 , wherein at least one of the one column and the other column is at least a joint pipe of a joint pipe. The outer diameter of the end portion inserted into the body portion is substantially constant.

The prefabricated concrete pillar according to claim 5 is the prefabricated concrete pillar according to any one of claims 1 to 3 , wherein at least one of the one pillar and the other pillar is at least a joint pipe main body of the joint pipe. The outer diameter of the end portion to be inserted into the portion is tapered.

A method for assembling a prefabricated concrete pillar according to claim 6 is a method for assembling a prefabricated concrete pillar according to any one of claims 1 to 5, wherein the end of one concrete pillar is One spacer and another retaining part that serves as a retaining part between the end of the part and another column made of concrete , and the inside of one end side and the other end side of the joint pipe main body part of the joint pipe The one pillar and the other pillar are connected by interposing another spacer that serves as a part .

According to the present invention, it is possible to manufacture at a low cost and to easily connect a plurality of columns without processing them.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the prefabricated concrete column of the 1st Embodiment of this invention. It is explanatory drawing which shows typically the assembly method of the assembly type concrete column same as the above in order of (a) thru|or (e). (a) is a perspective view showing one example of a spacer for the same prefabricated concrete pillar, and (b) is a perspective view showing another example of a spacer for the same prefabricated concrete pillar. It is explanatory drawing which shows typically the assembly method of the prefabricated concrete column of one reference technique of this invention in order of (a) thru|or (e). It is a cross-sectional view showing a prefabricated concrete column according to a second embodiment of the present invention. It is a cross-sectional view showing a prefabricated concrete column according to a third embodiment of the present invention. It is a cross-sectional view showing a prefabricated concrete column according to a fourth embodiment of the present invention.

A first embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a prefabricated concrete column. The prefabricated concrete column 1 is configured by connecting one column 2 made of concrete and another column 3 made of concrete via a joint pipe 4 .

One pillar 2 is a lower pillar in this embodiment. One columnar body 2 is formed in a cylindrical shape. One columnar body 2 has at least one insertion portion 6, which is a predetermined length region on the upper end side, which is inserted into the joint pipe 4, and is formed in a substantially constant straight shape. Although the shape of the one column 2 in the portion other than the one insertion portion 6 does not matter, in the present embodiment, the one column 2 is axially extended from the lower end, which is the end on one side in the axial direction. It is formed in a straight shape with a substantially constant diameter dimension (inner diameter dimension and outer diameter dimension) over the upper end portion, which is the other end portion, that is, over the entire length or substantially the entire length. Although not shown, a prestressing force (prestress) is applied to one column 2 by embedding a tendon along the axial direction.

The other column 3 is the upper column in this embodiment. Another columnar body 3 is formed in a cylindrical shape. The other column 3 has at least an end portion inserted into the joint pipe 4, that is, another insertion portion 7, which has a predetermined length on the lower end side, and is formed in a substantially constant straight shape. The shape of the other column 3 in the portion other than the insertion portion 7 is not critical, but in the present embodiment, the other column 3 extends axially from the lower end, which is the end on one side in the axial direction. It is formed in a straight shape with a substantially constant diameter dimension (inner diameter dimension and outer diameter dimension) over the upper end portion, which is the other end portion, that is, over the entire length or substantially the entire length. Although not shown, a tendon is embedded in the other column 3 along the axial direction to apply tension (prestress).

In the present embodiment, at least one insertion portion 6 and another insertion portion 7 of one column 2 and another column 3 have substantially the same diameter (inner diameter and outer diameter). formed. In the illustrated example, the one columnar body 2 and the other columnar body 3 are formed to have substantially the same diameter dimension (inner diameter dimension and outer diameter dimension) over the entire length.

The joint pipe 4 is formed in a cylindrical shape. The joint pipe 4 is a tubular body made of metal, such as a steel pipe. The joint pipe 4 integrates a cylindrical joint pipe main body 10 and a seat plate portion 11 formed in a direction intersecting or perpendicular to the axial direction of the joint pipe main body 10 with respect to the joint pipe main body 10. prepared for.

One insertion portion 6, which is the end portion of one column 2, is inserted into the joint pipe body portion 10 from one end side, and another insertion portion 7, which is the end portion of the other column 3, is inserted from the other end side. is interpolated. That is, one end side of the joint pipe body portion 10 with respect to the seat plate portion 11 is one inserted portion 12 into which one insertion portion 6 of one column body 2 is inserted. On the other hand, the other end side serves as another inserted portion 13 into which another insertion portion 7 of another column 3 is inserted. In this embodiment, in the joint pipe main body 10, one inserting portion 6 of the upper end portion of one column body 2 is inserted into one inserted portion 12, and another column is inserted into the other inserted portion 13. Another insert 7 at the lower end of body 3 is inserted. The inner diameter of the joint pipe body portion 10 is slightly larger than the outer diameter of the one and other insertion portions 6 and 7 of the one and other columns 2 and 3 to be inserted. That is, the inner diameter of one inserted portion 12 is slightly larger than the outer diameter of the end portion (one inserted portion 6) of one column 2, and the inner diameter of the other inserted portion 13 is the same as that of the other column. It is slightly larger than the outer diameter of the end of 3 (other insert 7). The thickness of the joint pipe body 10 (one and other inserted parts 12, 13) is equal to or greater than the cross-sectional strength of the one and other inserted parts 6, 7 of the one and other columns 2, 3 to be inserted. is set to be

The inner diameters of the one and the other inserted portions 12 and 13 are set substantially constant. In the present embodiment, since the outer diameters of one insertion portion 6 of one column 2 and the other insertion portion 7 of the other column 3 are substantially the same, the inner diameter of the one inserted portion 12 The inner diameter of the other inserted portion 13 is substantially the same. Further, in the present embodiment, the outer diameter of one inserted portion 12 and the outer diameter of the other inserted portion 13 are substantially the same. Therefore, in the present embodiment, the joint pipe main body 10 has a straight shape with substantially constant outer diameter and inner diameter over the entire length. Further, in the present embodiment, the axial length of the one and the other inserted parts 12, 13 is 1.1. more than five times.

The seat plate portion 11 regulates the insertion positions of the columns 2 and 3 into the joint pipe body portion 10 . That is, the seat plate portion 11 regulates the insertion positions of the one and other insertion portions 6 and 7 of the one and other columns 2 and 3 with respect to the one and other insertion portions 12 and 13, respectively. The seat plate portion 11 is arranged near the central portion of the joint pipe main body portion 10 in the axial direction. The seat plate portion 11 is formed in a circular flat plate shape. One and other main surfaces 15 and 16 of the seat plate portion 11 are formed substantially smooth. In this embodiment, the one and other main surfaces 15 and 16 of the seat plate portion 11 abut the end surfaces 17 and 18 of the one and other columns 2 and 3 . The end faces 17, 18 are formed substantially smooth. Note that the seat plate portion 11 may be formed with a hole portion 19 for the purpose of drainage or the like.

One retaining portion 22 and another retaining portion 23 are interposed between the joint pipe 4 and one insertion portion 6 of one column 2 and another insertion portion 7 of the other column 3, respectively. ing.

The one and other retaining portions 22 and 23 retain one insertion portion 6 of one column 2 and the other insertion portion 7 of the other column 3 from the joint pipe body portion 10 of the joint pipe 4. It is. That is, the one and the other retaining portions 22, 23 fix the one and the other inserting portions 6, 7 to the one and the other inserted portions 12, 13. . In this embodiment, the one and the other retaining portions 22, 23 are formed by the one and the other spacers S1, S2 shown in FIGS. 2(b) and 2(d). The one and other spacers S1 and S2 have an outer diameter approximately equal to the inner diameter of the joint pipe main body 10 (one and other inserted parts 12 and 13) and the joint pipe main body 10 (one and other inserted parts 12). , 13), which are made of metal, resin, or FRP and have an inner diameter approximately equal to the outer diameter of one and the other insertion portions 6, 7 of the one and the other columns 2, 3 (FIG. 3). (a) shows an example), or the inner diameter of the joint pipe main body 10 (one and other inserted parts 12, 13) and the joint pipe main body 10 (one and other inserted parts 12, 13) A metal, resin, or FRP plate-shaped part (shim plate, An example is shown in FIG. 3(b)). In the case of the example shown in FIG. 3(b), the one and other spacers S1, S2 are arranged intermittently in the circumferential direction of the one and other insertion portions 6, 7 of the one and other columns 2, 3. may be In addition, the one and other spacers S1 and S2 are attached to the inner surface of the joint pipe main body 10 (one and other inserted parts 12 and 13) and the joint pipe main body 10 (one and other inserted parts 12 and 13). To facilitate close contact with the outer surfaces of the one and other insertion portions 6 and 7 of the one and other columns 2 and 3 to be inserted, taper processing, deformation processing, split processing, or the like may be performed.

The one and other spacers S1 and S2 constituting the one and the other retaining parts 22 and 23 connect the one and the other insertion parts 6 and 7 of the one and the other columns 2 and 3 to the joint pipe main body part 10. On the other hand, it is not limited to filling the entire gap between the one and other insertion portions 6 and 7 of the one and other columns 2 and 3 and the joint pipe main body portion 10 as long as it can be retained. Further, the one and other spacers S1 and S2 are not limited to those that extend over the entire circumference of the clearance between the one and other insertion portions 6 and 7 of the one and other columns 2 and 3 and the joint pipe body portion 10, It may be arranged partially or intermittently in the circumferential direction with respect to this gap.

Next, a method for assembling the prefabricated concrete column 1 of the first embodiment will be described.

The prefabricated concrete column 1 uses the joint pipe 4 described above, and includes an end portion of one column body 2 and one and other insertion portions 6 and 7 of the other column body 3, and a joint pipe body portion 10 of the joint pipe 4. One spacer S1 and the other retaining portion 23 that serve as one retaining portion 22 between the inside of one end side (one inserted portion 12) and the inside of the other end side (other inserted portion 13) One column 2 and another column 3 are connected and assembled by interposing another spacer S2.

In the present embodiment, first, as shown in FIG. 2(a), one preformed pillar 2 is installed in the installation portion G. As shown in FIG.

Next, as shown in FIG. 2(b), one spacer S1 is attached to one insertion portion 6 of one column 2. Then, as shown in FIG. One spacer S1 may be fixed to one insertion portion 6 of one column 2 with an adhesive or the like. Also, an adhesive or the like may be applied to the outer peripheral side of one spacer S1.

Furthermore, as shown in FIG. 2(c), one insertion portion 6 of one column 2 to which one spacer S1 is attached is attached to one cover of the joint pipe main body portion 10 of the joint pipe 4 separately formed in advance. It is inserted into the insertion portion 12. At this time, the length for inserting one column 2 into the joint pipe main body portion 10 of the joint pipe 4, that is, the axial length of one insertion portion 6 is 1.1.5 times the outer diameter of one column 2. 5 times or more.

Next, as shown in FIG. 2(d), another spacer S2 is attached to another insertion portion 7 of another previously formed column 3. Next, as shown in FIG. Another spacer S2 may be fixed to another insertion portion 7 of another column 3 with an adhesive or the like. Also, an adhesive or the like may be applied to the outer peripheral side of another spacer S2.

Then, as shown in FIG. 2(e), the other inserted portion 7 of the other column 3 to which the other spacer S2 is attached is placed above the other inserted portion 13 of the joint pipe main body portion 10 of the joint pipe 4. Insert from At this time, the length for fitting and inserting the other column 3 into the joint pipe body 10 of the joint pipe 4, that is, the axial length of the other insertion portion 7 is 1.5 times the outer diameter of the other column 3. 5 times or more.

As a result, one pillar 2 and another pillar 3 are connected via the joint pipe 4, and the prefabricated concrete pillar 1 is assembled.

As described above, according to the first embodiment, the joint pipe 4 has the inner diameter of the joint pipe main body portion 10 substantially constant with respect to the seat plate portion 11 on the one end side and the other end side. , the joint pipe main body portion 10 can be composed of a straight pipe, and the seat plate portion 11 can be composed of a flat plate. Therefore, standard products can be used for the joint pipe main body 10 and the seat plate 11, respectively, so mass production of the joint pipe 4 is easy and can be manufactured at a low cost.

In addition, the one column 2 and the other column 3 can be easily connected by inserting the one and the other insertion portions 6 and 7, which are the ends, into the joint pipe 4. , and one column 2 and another column 3 that are easily manufactured in a general concrete column production process can be used.

Furthermore, since the positions of the one and the other insertion portions 6 and 7 of the one and the other columns 2 and 3 are regulated by the seat plate portion 11, the height of the prefabricated concrete column 1 is less likely to vary from product to product.

In addition, since the inner diameters of the one end side (one inserted portion 12) and the other end side (another inserted portion 13) of the seat plate portion 11 of the joint pipe body portion 10 are substantially the same, one and the other The insert portions 6, 7 of the pillars 2, 3 have substantially the same outer diameter, and it is also possible to form the pillars 2, 3 simultaneously in an integral mold.

In addition, since one and the other retaining portions 22 and 23 are interposed between the joint pipe 4 and the one and the other column bodies 2 and 3 and the other insertion portions 6 and 7, the joint pipe 4 and the joint pipe 4 are not aligned. and other pillars 2 and 3 are in close contact with each other, and rattling does not occur.

In the prefabricated concrete column 1, one column body 2 as a lower column is erected, one spacer S1 is attached to one insertion portion 6 at the upper end of the one column body 2, and a joint pipe 4 is installed from above. By installing another column 3 which is an upper column with another spacer S2 attached to another insertion portion 7 at the lower end, and erecting it in the joint pipe 4 from above, it is installed so as to be stacked in order from the bottom to the top. Since it can be done, construction is easy.

Moreover, since the first and the other spacers S1 and S2 can be separately formed in advance, there is little work at the site where the prefabricated concrete column 1 is installed, and they can be formed with high accuracy.

In the first embodiment, the one and the other retaining portions 22 and 23 may be formed by solidifying a resin mortar or a fluid fixing liquid such as an adhesive.

That is, in one reference technique shown in FIGS. 4A to 4E, first, as shown in FIG. As shown in 4(b), one inserting portion 6 of one columnar body 2 is coated with fixing liquid M, and one inserting portion 6 of one columnar body 2 to which the fixing liquid M is applied is removed as shown in FIG. As shown in FIG. 4(c), it is inserted into one inserted portion 12 of the joint pipe main body portion 10 of the joint pipe 4 which is separately formed in advance, and the fixing liquid M (FIG. 4(b)) is solidified to solidify the fixing liquid M (FIG. 4(b)). Section 22. Next, as shown in FIG. 4(d), the fixing liquid M is applied to the other inserting portion 7 of the preformed other columnar body 3, and the fixing liquid M is applied to the other columnar body 3. As shown in FIG. 4(e), the insertion portion 7 is inserted into the other inserted portion 13 of the joint pipe main body portion 10 of the joint pipe 4 from above, and the fixing liquid M (FIG. 4(d)) is solidified. to form another retaining portion 23. It is also possible to fix the joint pipe 4 and the first and other columns 2 and 3 using temporary fixing means until the fixing liquid M is solidified, thereby speeding up the construction. In this way, since the inner diameter of the joint pipe main body 10 of the joint pipe 4 is substantially constant on the one end side and the other end side of the seat plate 11, the joint pipe main body 10 can be used as a straight pipe. The seat plate portion 11 can be made of a flat plate, and the joint pipe 4 can be manufactured at low cost. The same effect as the above-described first embodiment can be obtained, for example, the one column 2 and the other column 3 that are easily manufactured in a general concrete column production process can be used without processing. In the prefabricated concrete column 1, one column body 2, which is the lower column, is erected, a fixing liquid M is applied to one insertion portion 6 of the upper end portion of one spacer S1, and a joint pipe 4 is applied. is attached from above, and another column 3, which is the upper column with the fixing liquid M applied to the other insertion portion 7 at the lower end, is built into the joint pipe 4 from above, so that the columns are stacked in order from the bottom to the top. Installation is easy because it can be installed in

Moreover, since the one and the other retaining portions 22 and 23 are formed while fixing the joint tube 4 and the one and the other columns 2 and 3 by solidifying the fixing liquid M itself, the one and the other retaining portions 22 and 23 are formed. 23 and the members for fixing the joint pipe 4 and the other pillars 2 and 3 separately, the man-hours and the number of materials can be reduced, and prefabricated concrete The column 1 can be assembled at a lower cost, and the fixing liquid M can be applied to the extent that it can fill the gap between the one and other column bodies 2 and 3 (one and other insertion parts 6 and 7) and the joint pipe 4. For example, it is not necessary to previously form members for forming the one and the other retaining portions 22, 23 with high dimensional accuracy.

The fixative applied to one insertion portion 6 of one column 2 and the fixative applied to the other insertion portion 7 of the other column 3 may be the same or different. Further, if the fixing liquid can prevent the one and other columns 2 and 3 from slipping off from the joint pipe main body 10, the fixation liquid can It is not limited to filling so as to fill the entire gap with the body portion 10 .

Further, instead of applying a fixing liquid to one and the other insertion portions 6 and 7 of the one and the other columns 2 and 3 and then inserting them into the joint pipe body portion 10, the one and the other columns 2 and 3 are After inserting at least one of the one and the other insertion portions 6 and 7 into the joint pipe body portion 10, at least one of the one and the other insertion portions 6 and 7 and the joint pipe body The one and the other retaining portions 22 and 23 may be formed by injecting a fixing liquid into the gap between the portion 10 and solidifying it.

Next, a second embodiment will be described with reference to FIG. Note that the same reference numerals are given to the same configurations and actions as those of the first embodiment and one reference technique described above, and the description thereof will be omitted.

In this embodiment, the joint pipe main body 10 of the joint pipe 4 has one end side into which one insertion portion 6 of one column 2 is inserted, and another insertion portion 7 of the other column 3 is inserted. The inner diameter and the outer diameter are different from the other end side.

The joint tube 4 is configured such that one inserted portion 12 and another inserted portion 13 are formed of tubes having different inner and outer diameters and are coaxially connected. In the present embodiment, the inner and outer diameters of one inserted portion 12, which is one end side into which one insertion portion 6 of one column 2 is inserted, The inner diameter and the outer diameter are set larger than the other inserted portion 13, which is the other end to be inserted. For this reason, the joint pipe 4 has a stepped connection portion between the one end side and the other end side. The one inserted portion 12 and the other inserted portion 13 have substantially constant inner and outer diameters, respectively.

Also, the seat plate portion 11 is located at an intermediate portion between one end side and the other end side of the joint pipe main body portion 10, that is, a boundary portion between one inserted portion 12 and another inserted portion 13. As shown in FIG. The seat plate portion 11 has a disc shape having a diameter equal to the inner diameter or the outer diameter of the one end side or the other end side of the joint pipe main body portion 10, whichever has the larger inner diameter or the outer diameter. is formed in

Also in the present embodiment, similarly to the first embodiment and the reference technique , one spacer or fixing liquid is inserted into one insertion portion 6 of the upper end portion of one columnar body 2 installed in the installation portion. , one insertion portion 6 of one column 2 is inserted into one inserted portion 12 of the joint pipe main body portion 10 of the joint pipe 4 to form one retaining portion 22, and the other column 3 Another spacer or fixing liquid is placed in the other insertion portion 7 at the lower end of the joint pipe 4, and the other insertion portion 7 of the other column 3 is placed above the other inserted portion 13 of the joint pipe main body 10 of the joint pipe 4. The prefabricated concrete pillar 1 is assembled by inserting it through and forming another retaining part 23. - 特許庁

In this manner, since the inner diameter of the joint pipe main body 10 of the joint pipe 4 is substantially constant on the one end side and the other end side of the seat plate 11, the joint pipe main body 10 is a straight pipe. The seat plate portion 11 can be made of a flat plate, and the joint pipe 4 can be manufactured at low cost. It is similar to the first embodiment and the reference technology described above in that it does not require processing and can use one pillar 2 and another pillar 3 that are easily manufactured in a general concrete pillar production process. Operation and effects can be achieved.

In addition, since the inner diameters of one end side (one inserted portion 12) and the other end side (another inserted portion 13) of the seat plate portion 11 of the joint pipe main body portion 10 are different, one column body 2 and the other column 3 may have different outer diameters for at least one and the other insertion portions 6 and 7 depending on their respective purposes and uses. For example, in the present embodiment, a column having a large outer diameter can be used as one column 2 installed in the installation portion, so that the prefabricated concrete column 1 can have a higher strength.

In each of the above embodiments and one reference technique , at least one of the one and the other columns 2 and 3 is at least the joint pipe main body portion 10 of the joint pipe 4 (the one and the other inserted portions 12 and 13 ) may be tapered. The “tapered shape” referred to here means a shape in which one columnar body 2 gradually decreases in diameter toward the other columnar body 3 , and the other columnar body 3 gradually expands in diameter toward the one columnar body 2 . It is a shape that is

For example, like the third embodiment shown in FIG. 6 or the fourth embodiment shown in FIG. It may be formed in a tapered shape so that the diameter is gradually reduced. In this case, the inner diameters of the one and the other retaining portions 22, 23 are tapered along the outer diameters of the one and the other columns 2, 3, so that each of the above-described embodiments and one reference technique The prefabricated concrete column 1 can be assembled in the same manner as .

1 prefabricated concrete pillar 2 one pillar 3 other pillar 4 joint pipe
10 Joint pipe body
11 Seat plate
22 One retainer
23 Other retaining parts
S1 One spacer S2 Other spacer

Claims (6)

A joint pipe for connecting a plurality of columns made of concrete, comprising a cylindrical joint pipe body into which the columns are inserted from both ends, and an axial direction of the joint pipe body with respect to the joint pipe body. and a seat plate portion formed in a direction intersecting with and regulating the insertion position of each column into the joint pipe main body portion, wherein the joint pipe main body portion is located on the one end side of the seat plate portion. a joint pipe having a substantially constant inner diameter with respect to the other end;
a column made of concrete having an end inserted into one end of the joint pipe main body of the joint pipe;
another column made of concrete, the end of which is inserted into the other end of the joint pipe main body of the joint pipe;
a retaining portion interposed in a gap between the end portion of the one columnar body and the joint pipe main body portion of the joint pipe for retaining the end portion of the one columnar body from the joint pipe main body portion; ,
another retaining portion interposed in a gap between the end of the other column and the joint pipe main body of the joint pipe for retaining the end of the other column from the joint pipe main body; , and
The one and other retaining portions are fixed in contact with each of the outer surface of the one and other columns and the inner surface of the joint pipe body portion of the joint pipe when viewed in a longitudinal section passing through the central axis. A prefabricated concrete column, characterized in that it has a contact portion that is 2. The prefabricated concrete column according to claim 1, wherein the joint pipe body has substantially the same inner diameter on the one end side and the other end side of the seat plate. 2. The prefabricated concrete column according to claim 1, wherein the joint pipe main body portion has different inner diameters on one end side and the other end side of the seat plate portion. At least one of the one pillar and the other pillar has a substantially constant outer diameter at least at the end portion of the joint pipe that is inserted into the joint pipe main body. A prefabricated concrete column according to one. 3. At least one of the one column and the other column has a tapered outer diameter at least at the end portion thereof that is inserted into the joint pipe main body of the joint pipe. A prefabricated concrete column according to any one of the above. A method for assembling a prefabricated concrete pillar according to any one of claims 1 to 5, comprising:
One retaining part between the end of one column made of concrete and the end of the other concrete column and the inside of one end side and the inside of the other end side of the joint pipe main body of the joint pipe A method for assembling a prefabricated concrete column, wherein the one column and the other column are connected by interposing one spacer that serves as a retaining portion and another spacer that serves as another retaining portion.

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