JP2022156076A - Concrete steel pipe column and method of constructing the same - Google Patents

Abstract

To provide a concrete steel pipe column capable of improving construction efficiency of the concrete steel pipe column.SOLUTION: A concrete steel pipe column 1 consists of a lower steel pipe 10, a lower column main reinforcement 20 built into the lower steel pipe 10, an upper steel pipe 30 arranged above the lower steel pipe 10, an upper column main reinforcement 40 built into the upper steel pipe 30, a joint reinforcement 50 provided across the inside of the lower steel pipe 10 and the upper steel pipe 30, and a concrete body 60 filled inside the lower steel pipe 10 and the upper steel pipe 30. On the upper-end side of the lower steel pipe 10, a lower positioning member 70 with the lower column main reinforcement 20 temporarily fixed is attached. On the lower-end side of the upper steel pipe 30, an upper positioning member 80 with the upper column main reinforcement 40 temporarily fixed is attached. The lower column main reinforcement 20 and the upper column main reinforcement 40 are connected via the joint reinforcement 50.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a concrete steel pipe column with a built-in reinforcing bar and filled with concrete, and a method for constructing the concrete steel pipe column.

Conventionally, there is a concrete steel pipe column (RCFT column) in which a column main reinforcement is arranged inside a steel pipe and concrete is cast (see Patent Documents 1 to 3).
Patent Literature 1 discloses a filled steel pipe concrete structural column that includes a steel pipe, threaded reinforcing bars extending in the axial direction of the steel pipe arranged inside the steel pipe, and filled concrete filled in the steel pipe. .
Patent Literature 2 discloses a concrete-filled steel pipe with built-in reinforcing bars in which reinforcing bars extending in the axial direction are arranged inside upper and lower steel pipes and filled with concrete. A ring plate is fixed in each steel pipe. The ring plate is formed with a plurality of through holes through which the reinforcing bars are passed. When connecting the steel pipes, the reinforcing bars of each steel pipe are inserted through the through holes of the ring plate.

Patent Literature 3 shows a steel pipe concrete column joint structure in which a reinforcing bar cage is arranged in steel pipes, and concrete is placed inside the steel pipes after the steel pipes are connected in the longitudinal direction. The reinforcing bar cage is formed longer than the steel pipe by a predetermined length so that the end portions of the reinforcing bar cage can be overlapped when connecting the steel pipes, and the outer diameter of one end of the reinforcing bar cage is equal to that of the other end. smaller than the inner diameter of the

JP-A-10-204995 JP-A-2008-69570 Japanese Patent Application Laid-Open No. 2001-132103

An object of the present invention is to provide a concrete steel pipe pillar and a construction method thereof that can improve the construction efficiency of the concrete steel pipe pillar.

As a method for constructing a reinforced concrete steel pipe column in which the column main reinforcement is built into the steel pipe, the inventors of the present invention do not join the column main reinforcement using a reinforcing bar joint jig or a lap joint, but straddle the upper and lower steel pipes. By providing the joint reinforcement at a position that is distant from the main reinforcement of the column, and by joining with an open lap joint, the concrete steel pipe column can be installed while ensuring sufficient concrete filling performance around the main reinforcement of the column and the joint reinforcement. The present invention has been made by paying attention to the fact that it can be constructed efficiently.
A concrete steel pipe column (for example, a concrete steel pipe column 1 described later) of the first invention is a concrete steel pipe column in which reinforcing bars are built and filled with concrete, and a lower steel pipe (for example, a lower steel pipe described later) 10), a lower column main reinforcement built into the lower steel pipe (for example, a lower column main reinforcement 20 described later), and an upper steel pipe arranged on the lower steel pipe (for example, a an upper steel pipe 30), an upper column main reinforcement (for example, an upper column main reinforcement 40 described later) that is built in the upper steel pipe and arranged directly above the lower column main reinforcement, and the lower steel pipe and a joint reinforcement (for example, a joint reinforcement 50 to be described later) provided across the inside of the upper steel pipe and arranged at a predetermined distance in the horizontal direction from the lower column main reinforcement and the upper column main reinforcement. and a concrete body (for example, a concrete body 60 described later) filled inside the lower steel pipe and the upper steel pipe, and the lower pillar is provided on the upper end side of the lower steel pipe A lower positioning member (for example, a lower positioning member 70 described later) to which the main reinforcement is temporarily fixed is attached, and the upper positioning member to which the upper column main reinforcement is temporarily fixed is attached to the lower end side of the upper steel pipe. A member (for example, an upper positioning member 80 to be described later) is attached, and the lower column main reinforcement and the upper column main reinforcement are connected via the joint reinforcement.

According to this invention, a predetermined gap is ensured between the column main reinforcement and the joint reinforcement on the lower side and between the column main reinforcement and the joint reinforcement on the upper side. Therefore, by placing concrete inside the lower steel pipe and the upper steel pipe, the upper and lower column main reinforcements can be reliably joined by the gap lap joint via the joint reinforcement. Thus, by using the open lap joint, the work efficiency can be improved as compared with the mechanical joint and the lap joint.
In addition, the lower positioning member can be used to easily position the lower column main reinforcement inside the lower steel pipe, and the upper positioning member can be used to easily position the upper column main reinforcement inside the upper steel pipe. can be positioned.
In addition, since the column main reinforcement on the lower side and the column main reinforcement on the upper side are joined by lap joints via the joint reinforcement, even if the column main reinforcement is arranged inside the steel pipe and unitized, the steel pipe of each column main reinforcement can be The projecting dimension of is small. Therefore, at a factory, the steel pipe with the column main reinforcement arranged inside is unitized, and the unitized steel pipe and the column main reinforcement can be easily transported to the site by a trailer, so that the construction efficiency of the concrete steel pipe column can be improved.

The concrete steel pipe column of the second invention is characterized in that a joint-bar positioning member (for example, a joint-bar positioning member 90 described later) to which the joint bar is temporarily fixed is attached to the upper surface of the lower positioning member. and

According to this invention, by attaching the joint muscle positioning member to which the joint muscle is temporarily fixed to the upper surface of the lower positioning member, the joint muscle can be easily positioned. In addition, since the joint bar positioning member is arranged on the upper surface of the lower column main bar positioning member, concrete can be filled between the joint bar positioning member and the lower column main bar positioning member. Therefore, it is possible to reliably join the upper and lower column main reinforcements with the gap lap joint via the joint reinforcement.

A method for constructing a concrete steel pipe column according to a third aspect of the invention is a method for constructing a concrete steel pipe column in which reinforcing bars are built-in and filled with concrete. By attaching the lower positioning member to the upper end surface of the lower steel pipe, the lower column main reinforcement is arranged inside the lower steel pipe, and the lower steel pipe in which the lower column main reinforcement is built is placed. A step of erecting (for example, step S1 described later), a step of temporarily fixing the joint muscle to the joint muscle positioning member and attaching the joint muscle positioning member to the lower positioning member (for example, step S2); By temporarily fixing the column main reinforcement to the upper positioning member and attaching the upper positioning member to the lower end surface of the upper steel pipe, the upper column main reinforcement is arranged inside the upper steel pipe, and the upper column main reinforcement is A step of erecting the built-in upper steel pipe on top of the lower steel pipe (for example, step S3 described later), and a step of welding and joining the lower steel pipe and the upper steel pipe (for example, a step described later S4), and at least a step of placing concrete inside the lower steel pipe (for example, step S5 described later).

According to this invention, first, the lower steel pipe in which the lower column main reinforcement is built is erected. Next, the joint bar positioning member to which the joint bar is temporarily fixed is attached to the lower positioning member on the upper end face of the lower steel pipe. Next, the upper steel pipe containing the upper column main reinforcement is erected on the lower steel pipe. Next, concrete is placed at least inside the lower steel pipe.
Therefore, the upper and lower column main reinforcements can be reliably joined by the gap lap joint via the joint reinforcement. By using the open lap joint in this way, the working efficiency can be improved as compared with the mechanical joint and the lap joint.
In addition, the lower positioning member can be used to easily position the lower column main reinforcement inside the lower steel pipe, and the upper positioning member can be used to easily position the upper column main reinforcement inside the upper steel pipe. can be positioned. Moreover, the joint muscle can be easily positioned using the joint muscle positioning member.
In addition, since the upper and lower column main reinforcements are joined by lap joints via joint reinforcements, even if the column main reinforcements are arranged inside the steel pipe and unitized, the projection dimension of each column main reinforcement from the steel pipe becomes small. Therefore, at a factory, the steel pipe with the column main reinforcement arranged inside is unitized, and the unitized steel pipe and the column main reinforcement can be easily transported to the site by a trailer, so that the construction efficiency of the concrete steel pipe column can be improved.

ADVANTAGE OF THE INVENTION According to this invention, the concrete steel pipe pillar which can improve the construction efficiency of a concrete steel pipe pillar, and its construction method can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the structure of the concrete steel pipe column which concerns on one Embodiment of this invention. It is a flow chart of the construction procedure of the concrete steel pipe column. Explanatory drawing of the construction procedure of a concrete steel pipe column (Part 1: Attaching a joint reinforcement unit to the lower steel pipe unit) Explanatory drawing of the construction procedure of a concrete steel pipe column (Part 2: Mounting the upper steel pipe unit on top of the lower steel pipe unit) FIG. 4 is a vertical cross-sectional view of a lower steel pipe unit that constitutes a concrete steel pipe column; FIG. 6 is an enlarged view of the upper end of the lower steel pipe unit of FIG. 5; FIG. 6 is a plan view showing a state in which a lower positioning member is superimposed on the top plate of the lower steel pipe unit of FIG. 5; FIG. 8 is a cross-sectional view taken along the line AA of FIG. 7; It is a side view of the joint reinforcement unit which comprises a concrete steel pipe column. FIG. 10 is an enlarged view of the central portion of the joint muscle unit of FIG. 9; Fig. 10 is a plan view of a joint-bar positioning member of the joint-bar unit of Fig. 9; FIG. 4 is a vertical cross-sectional view showing a state in which the joint bar unit is attached to the lower steel pipe unit; FIG. 13 is a plan view showing a state in which the joint muscle positioning member is superimposed on the lower positioning member in FIG. 12 ; FIG. 14 is a cross-sectional view taken along the line BB of FIG. 13; FIG. 4 is a vertical cross-sectional view of an upper steel pipe unit that constitutes a concrete steel pipe column; FIG. 16 is an enlarged view of the lower end of the upper steel pipe unit of FIG. 15; FIG. 16 is a plan view (upward view) of a state in which an upper positioning member is superimposed on the bottom plate of the upper steel pipe unit of FIG. 15; FIG. 18 is a sectional view taken along line CC of FIG. 17; Diagram showing a list of specimens used in the load test It is a figure which shows the shape of a test body. It is a figure which shows the force application method of a test body. It is a figure which shows an example of the test result of a load test.

INDUSTRIAL APPLICABILITY The present invention is a reinforced concrete steel pipe column in which column main reinforcements are joined together by open lap joints, and a method for constructing the same.
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic diagram showing the structure of a concrete steel pipe column 1 according to one embodiment of the present invention.
The concrete steel pipe column 1 is shown as a concrete steel pipe column 1 in which reinforcing bars are embedded and concrete is filled. The lower steel pipe 10, the lower column main reinforcement 20 built in the lower steel pipe 10, the upper steel pipe 30 arranged on the lower steel pipe 10, and the lower steel pipe 30 built in the upper steel pipe 30 The upper column main reinforcement 40 arranged directly above the side column main reinforcement 20, and the lower column main reinforcement 20 and the upper column main reinforcement provided across the inside of the lower steel pipe 10 and the upper steel pipe 30 A joint bar 50 arranged at a predetermined distance from 40 in the horizontal direction, and a concrete body 60 filled inside the steel pipe 10 on the lower side and the steel pipe 30 on the upper side. The total length of this concrete steel pipe column ₁ is L1.
As will be described later, the column main reinforcements 20, 40 are provided with closed ties 22, 42, respectively. For the sake of simplicity, the ties 22, 42 are omitted.

A lower positioning member 70 to which the lower column main reinforcement 20 is temporarily fixed is attached to the upper end face of the lower steel pipe 10 . A joint muscle positioning member 90 to which the joint muscle 50 is temporarily fixed is attached to the upper end face of the lower positioning member 70 . An upper positioning member 80 to which the upper main column reinforcement 40 is temporarily fixed is attached to the lower end side of the upper steel pipe 30 .
The column main reinforcement 20 on the lower side and the column main reinforcement 40 on the upper side are connected by joints 50 via joint reinforcements 50 .

Hereinafter, the construction procedure of the concrete steel pipe column 1 will be described with reference to the flowchart of FIG.
In step S1, as shown in FIG. 3, the lower steel pipe unit ₂ having a total length of L2 is erected. Specifically, at the factory, the lower column main reinforcement 20 is temporarily fixed to the lower positioning member 70, and the lower positioning member 70 is attached to the upper end surface of the lower steel pipe 10, thereby A lower steel pipe unit 2 is formed by arranging a lower column main reinforcement 20 inside the steel pipe 10 of . Then, the lower steel pipe unit 2 is loaded on a vehicle such as a trailer, transported from the factory to the construction site, and erected.
In step S2, as shown in FIG. 3, the joint bar unit ₃ having the total length L3 is attached to the lower steel pipe unit 2. As shown in FIG. Specifically, the joint-bar unit 3 is formed by temporarily fixing the joint-bar 50 to the joint-bar positioning member 90 at the factory. Then, the lower steel pipe unit 2 is loaded on a vehicle such as a trailer and transported from the factory to the construction site. Next, the joint-bar unit 3 is lifted by a lifting machine such as a crane, and the joint-bar positioning member 90 of the joint-bar unit 3 is attached to the lower positioning member 70 of the lower steel pipe unit 2 . When the joint bar unit 3 is attached to the lower steel pipe unit 2, as shown in FIG. ₄ , the total length is L4.

In step S3, the upper steel pipe unit 4 is erected on the lower steel pipe unit 2, as shown in FIG. Specifically, at the factory, the upper column main reinforcement 40 is temporarily fixed to the upper positioning member 80, and the upper positioning member 80 is attached to the lower end side of the upper steel pipe 30, so that the inside of the upper steel pipe 30 The upper column main reinforcement 40 is arranged at the upper side steel pipe unit 4 . Then, the upper steel pipe unit 4 is loaded on a vehicle such as a trailer, transported from the factory to the construction site, and erected. When the joint bar unit 3 and the upper steel pipe unit 4 are attached to the lower steel pipe unit ₂ , the overall length is L1 as shown in FIG.
In step S4, the lower steel pipe 10 of the lower steel pipe unit 2 and the upper steel pipe 30 of the upper steel pipe unit 4 are joined by welding.
In step S<b>5 , concrete is placed inside the lower steel pipe 10 of the lower steel pipe unit 2 and the upper steel pipe 30 of the upper steel pipe unit 4 . It should be noted that the welding heat between the steel pipes 10 and 30 and the welding heat between the steel pipes 10 and 30 and the beams that engage the steel pipes 10 and 30 do not affect the concrete. After cooling, the steel pipes 10 and 30 are pressed in from below.

The configuration of the lower steel pipe unit 2 will be described in detail below.
5 is a longitudinal sectional view of the lower steel pipe unit 2. FIG. 6 is an enlarged view of the upper end of the lower steel pipe unit 2 of FIG. 5. FIG. FIG. 7 is a plan view showing a state in which the lower positioning member 70 is superimposed on the top plate 11 of the lower steel pipe unit 2 of FIG. FIG. 8 is a cross-sectional view taken along line AA of FIG.
As described above, the lower steel pipe unit 2 includes the lower steel pipe 10, the lower positioning member 70 attached to the upper end surface of the lower steel pipe 10, and the lower positioning member 70 temporarily fixed to the lower positioning member 70. A side column main reinforcement 20 is provided.
The steel pipe 10 on the lower side is a square steel pipe, and a top plate 11 that is a rectangular plate material is provided on the upper end surface of the steel pipe 10 on the lower side. A circular opening 12 is formed in the central portion of the top plate 11 for inserting a concrete placing pipe. Raised portions 13 having a height of about 50 mm are provided near the four corners of the top plate 11, and bolt insertion holes 14 for inserting bolts are formed in the upper surface of the raised portions 13.

The positioning member 70 on the lower side is a rectangular plate material, and has a circular opening 71 formed in the center thereof for inserting a concrete placing pipe. Column main-reinforcement insertion holes 72 for inserting the lower column main-reinforcements 20 are formed at predetermined intervals around the opening 71 . Bolt insertion holes 73 for inserting bolts are formed near the four corners of the lower positioning member 70 . Further, bolt insertion holes 74 for inserting bolts are formed at four positions of the lower positioning member 70 .
By inserting a bolt into the bolt insertion hole 73 of the lower positioning member 70 and the bolt insertion hole 14 of the raising portion 13 of the top plate 11 and tightening the nut, the lower positioning member 70 raises the top plate 11. It is fixed to the part 13 . At this time, a gap is formed between the lower positioning member 70 and the top plate 11 .
Screws are engraved on the outer peripheral surface of the column main reinforcement 20 on the lower side. By inserting the lower column main reinforcement 20 into the column main reinforcement insertion hole 72 of the lower positioning member 70 and tightening it with the lock nut 21, the lower column main reinforcement 20 is temporarily fixed to the lower positioning member 70. be. In addition, ties 22 are provided at predetermined intervals in the vertical direction, surrounding the column main reinforcement 20 on the lower side.

The configuration of the joint bar unit 3 will be described in detail below.
FIG. 9 is a side view of the joint bar unit 3. FIG. FIG. 10 is an enlarged view of the central portion of the joint muscle unit 3 of FIG. 11 is a plan view of the joint-bar positioning member 90 of the joint-bar unit 3 of FIG. 9. FIG.
As described above, the joint-bar unit 3 includes the joint-bar positioning member 90 and the joint-bar 50 temporarily fixed to the joint-bar positioning member 90 . The joint muscle unit 3 is supported by a lifting machine such as a crane via a shackle 5 and a suspension wire 6 attached to a joint muscle positioning member 90 .
The joint bar positioning member 90 includes a positioning steel plate 91 that is an annular plate material, and support portions 92 made of angle steel provided at four locations on the peripheral edge of the positioning steel plate 91 . The support portion 92 includes a substantially horizontal horizontal portion 93 and a vertical portion 94 extending substantially vertically from one end of the horizontal portion 93 . The positioning steel plate 91 is joined to the vertical portion 94 at an intermediate height position.
A bolt insertion hole 95 for inserting a bolt is formed in the horizontal portion 93 . An insertion hole 96 for inserting the shackle 5 is formed in the upper portion of the vertical portion 94 .
The positioning steel plates 91 are formed with joint muscle insertion holes 97 for inserting the joint muscles 50 at predetermined intervals.
A screw is engraved on the outer peripheral surface of the joint muscle 50 . The joint muscle 50 is temporarily fixed to the joint muscle positioning member 90 by inserting the joint muscle 50 into the joint muscle insertion hole 97 of the joint muscle positioning member 90 and tightening the lock nut 51 from above and below. Further, shape-retaining muscles 52 that connect the joint muscles 50 are provided on the upper end side and the lower end side of the joint muscles 50 .

FIG. 12 is a vertical cross-sectional view showing a state in which the joint bar unit 3 is attached to the lower steel pipe unit 2. As shown in FIG. FIG. 13 is a plan view showing a state in which the joint muscle positioning member 90 is superimposed on the lower positioning member 70 of FIG. 12 . 14 is a cross-sectional view taken along the line BB of FIG. 13. FIG.
The joint muscle positioning member 90 is fixed to the lower positioning member 70 by inserting a bolt through the bolt insertion hole 95 of the joint muscle positioning member 90 and the bolt insertion hole 74 of the lower positioning member 70 and tightening the nut. be done. At this time, a gap is formed between the positioning steel plate 91 of the joint bar positioning member 90 and the lower positioning member 70 .

The configuration of the upper steel pipe unit 4 will be described in detail below.
15 is a longitudinal sectional view of the upper steel pipe unit 4. FIG. 16 is an enlarged view of the lower end of the upper steel pipe unit 4 of FIG. 15. FIG. 17 is a plan view (upward view) of a state in which the upper positioning member 80 is superimposed on the bottom plate 31 of the upper steel pipe unit 4 of FIG. 15. FIG. 18 is a cross-sectional view taken along line CC of FIG. 17. FIG.
As described above, the upper steel pipe unit 4 includes the upper steel pipe 30, the upper positioning member 80 attached to the lower end of the upper steel pipe 30, and the upper column main reinforcement 40 temporarily fixed to the upper positioning member 80. Prepare.
The upper steel pipe 30 is a square steel pipe, and a bottom plate 31 that is a rectangular plate material is provided at the lower end of the upper steel pipe 30 . A circular opening 32 for inserting a concrete placing pipe is formed in the center of the bottom plate 31 . Raised portions 33 having a height of about 50 mm are provided near the four corners of the bottom plate 31, and bolt insertion holes 34 for inserting bolts are formed on the lower surface of the raised portions 33.

The upper positioning member 80 is a rectangular plate material, and has a circular opening 81 formed in the center thereof for inserting a concrete placing pipe. Column main-reinforcement insertion holes 82 for inserting the upper column main-reinforcements 40 are formed at predetermined intervals around the opening 81 . Bolt insertion holes 83 for inserting bolts are formed near the four corners of the upper positioning member 80 .
By inserting a bolt into the bolt insertion hole 83 of the upper positioning member 80 and the bolt insertion hole 34 of the raised portion 33 of the bottom plate 31 and tightening the nut, the upper positioning member 80 is attached to the raised portion 33 of the bottom plate 31. fixed to At this time, a gap is formed between the upper positioning member 80 and the bottom plate 31 .

A screw is engraved on the outer peripheral surface of the upper column main reinforcement 40 . By inserting the upper column main reinforcement 40 into the column main reinforcement insertion hole 82 of the upper positioning member 80 and tightening it with the lock nut 41 , the upper column main reinforcement 40 is temporarily fixed to the upper positioning member 80 . In addition, ties 42 are provided at predetermined intervals in the vertical direction to surround the upper column main reinforcement 40 .
When the upper steel pipe unit 4 is erected on the lower steel pipe unit 2 , the upper positioning member 80 of the upper steel pipe unit 4 contacts the upper end surface of the vertical portion 94 of the joint bar positioning member 90 .

[Lap joint element test to confirm effectiveness of lap joint]
A loading test was conducted to confirm the effectiveness of the lap joint between the main reinforcing bars of a steel pipe. FIG. 19 is a diagram showing a list of specimens used in the load test, in which the target concrete compressive strength, overlap length, and width of the specimen were used as experimental parameters. FIG. 20 is a diagram showing the shape of the specimen. FIG. 21 is a diagram showing a method of applying force to the test piece. In this loading test, two reinforcing bars are embedded in a concrete body separated by a predetermined distance (100 mm) as a test body, and the two reinforcing bars embedded in this test body are pulled in opposite directions, The relationship between P and the withdrawal displacement δ of the reinforcing bar caused by this tensile force P was measured. FIG. 22 shows an example of the test results of the load test (the test results of the specimen 1 and the specimen 5). As shown in FIG. 22, in the test specimen with a concrete target compressive strength of 60 N / mm ² , the maximum load during the experiment is the same as the previous literature (Sakae Fujii, Shiro Morita: Research on bond splitting strength of deformed reinforcing bars (1st report ), Proceedings of the Architectural Institute of Japan, No. 319, pp. 47-55, 1982.9. On the other hand, in the test specimen with the target concrete compressive strength of 100 N/mm ² , the maximum load during the experiment was 1.06 times the calculated value obtained by the above calculation method. In both test specimens, during the experiment, no unnatural cracks occurred in the concrete around the main reinforcing bars of the columns, and the reinforcing bars came out and reached the maximum strength. Therefore, it was confirmed by this lap joint element test that the perforated lap joint is effective for the maximum yield strength and the failure mode at the maximum yield strength.

According to this embodiment, there are the following effects.
(1) Predetermined gaps are secured between the column main reinforcement 20 and the joint reinforcement 50 on the lower side and between the column main reinforcement 40 and the joint reinforcement 50 on the upper side. Therefore, by placing concrete inside the lower steel pipe 10 and the upper steel pipe 30 , the upper and lower column main reinforcements 20 and 40 can be reliably joined by the gap lap joint via the joint reinforcement 50 . Thus, by using the open lap joint, the work efficiency can be improved as compared with the mechanical joint and the lap joint.
In addition, the lower positioning member 70 can be used to easily position the lower column main reinforcement 20 inside the lower steel pipe 10, and the upper positioning member 80 can be used to position the upper steel pipe 30 inside the upper steel pipe 30. The column main reinforcement 40 can be easily positioned.
In addition, since the lower column main reinforcement 20 and the upper column main reinforcement 40 are joined by a gap lap joint via the joint reinforcement 50, the column main reinforcements 20, 40 are arranged inside the steel pipes 10, 30 to form a unit. For the lower steel pipe unit 2 and the upper steel pipe unit 4, the projection dimension of each column main reinforcement 20, 40 from the steel pipes 10, 30 becomes smaller. Therefore, since the lower steel pipe unit 2 and the upper steel pipe unit 4 can be manufactured at the factory and easily transported to the site by a trailer, the construction efficiency of the concrete steel pipe column 1 can be improved. can improve.

(2) By attaching the joint muscle positioning member 90 to which the joint muscle 50 is temporarily fixed to the upper surface of the lower positioning member 70, the joint muscle 50 can be easily positioned. Moreover, since the joint-bar positioning member 90 is arranged on the upper surface of the lower positioning member 70 , concrete can be filled between the positioning steel plate 91 of the joint-bar positioning member 90 and the column main-bar positioning member 70 on the lower side. Therefore, the upper and lower column main reinforcements 20 and 40 can be reliably joined by the gap lap joint via the joint reinforcement 50 . Further, since a gap is secured between the top plate 11 on the upper end surface of the lower steel pipe unit 2 and the lower positioning member 70, concrete can be reliably filled.
(3) The joint reinforcement 50 is provided on the outer peripheral side of the steel pipes 10 and 30 while being separated from the column main reinforcements 20 and 40 by a predetermined distance. Therefore, compared to the case where the joint reinforcement 50 is provided at the center of the steel pipes 10 and 30 , a large moment of inertia of area of the steel pipe column 1 determined by the position of the joint reinforcement 50 can be ensured.

It should be noted that the present invention is not limited to the above-described embodiments, and includes modifications, improvements, etc. within the scope of achieving the object of the present invention.
For example, in the present embodiment, the lower steel pipe unit ₂ having the total length L2 and the joint bar unit ₃ having the total length L3 are separately transported from the factory to the construction site. Although the unit 3 is attached, it is not limited to this. That is, if the overall length L4 with the joint bar unit 3 attached to the lower steel pipe unit ₂ is short enough to be loaded on a vehicle such as a trailer, the lower steel pipe unit 2 may be attached to the joint bar at the factory. The unit 3 may be attached and transported to the construction site in this state. If the total length L1 of the lower steel pipe unit ₂ with the joint bar unit 3 and the upper steel pipe unit 4 attached is short enough to be loaded on a vehicle such as a trailer, the lower steel pipe The joint bar unit 3 and the upper steel pipe unit 4 may be attached to the unit 2 and transported to the construction site in this state.
Alternatively, the concrete steel pipe column 1 may be constructed by the following procedure. That is, first, the lower steel pipe 10 is erected. Next, a column main-reinforcement unit is assembled by integrating the lower column main-reinforcement 20 and the joint reinforcement unit 3, and this column main-reinforcement unit is dropped into the lower steel pipe 10.例文帳に追加Next, the upper steel pipe unit 4 is attached on the lower steel pipe 10, and the lower steel pipe 10 and the upper steel pipe 30 are welded.

DESCRIPTION OF SYMBOLS 1... Concrete steel pipe column 2... Lower steel pipe unit 3... Joint bar unit 4... Upper steel pipe unit 5... Shackle 6... Suspension wire 10... Lower steel pipe 11... Top plate 12... Circular opening 13... Raising part 14... Bolt Insertion hole 20 lower column main reinforcement 21 lock nut 22 tie bar 30 upper steel pipe 31 bottom plate 32 circular opening 33 raised portion 34 bolt insertion hole 40 upper column main reinforcement 41 lock nut 42... Tie bar 50... Joint bar 51... Lock nut 52... Shape retaining bar 60... Concrete body 70... Lower positioning member 71... Circular opening 72... Column main bar insertion hole 73... Bolt insertion hole 74... Bolt insertion hole 80 Upper positioning member 81 Circular opening 82 Column main reinforcement insertion hole 83 Bolt insertion hole 90 Joint bar positioning member 91 Positioning steel plate 92 Support portion 93 Horizontal portion 94 Vertical portion 95 Bolt insertion hole 96 Insertion hole 97 ... Joint bar insertion hole L1 ... _Overall length of concrete steel pipe column L2 ... _Overall length of _lower steel pipe unit L3 ... _Overall length of joint bar unit L4 ... With joint bar unit attached to lower steel pipe unit full length

Claims (3)

A concrete steel pipe column with built-in reinforcing bars and filled with concrete,
a lower steel pipe;
a lower column main reinforcement built into the lower steel pipe;
an upper steel pipe placed on the lower steel pipe;
an upper column main reinforcement built into the upper steel pipe and arranged directly above the lower column main reinforcement;
a joint reinforcement provided across the inside of the lower steel pipe and the upper steel pipe and arranged at a predetermined distance in the horizontal direction from the lower column main reinforcement and the upper column main reinforcement;
a concrete body filled inside the lower steel pipe and the upper steel pipe,
A lower positioning member to which the lower column main reinforcement is temporarily fixed is attached to the upper end side of the lower steel pipe,
An upper positioning member to which the upper column main reinforcement is temporarily fixed is attached to the lower end side of the upper steel pipe,
A concrete steel pipe column, wherein the lower column main reinforcement and the upper column main reinforcement are connected via the joint reinforcement. The concrete steel pipe column according to claim 1, wherein a joint bar positioning member to which the joint bar is temporarily fixed is attached to the upper surface of the lower positioning member. A method for constructing a concrete steel pipe column with built-in reinforcing bars and filled with concrete, comprising:
By temporarily fixing the lower column main reinforcement to the lower positioning member and attaching the lower positioning member to the upper end surface of the lower steel pipe, the lower column main reinforcement is arranged inside the lower steel pipe. and a step of erecting the lower steel pipe in which the lower column main reinforcement is built;
temporarily fixing the joint bar to the joint bar positioning member and attaching the joint bar positioning member to the lower positioning member;
By temporarily fixing the column main reinforcement to the upper positioning member and attaching the upper positioning member to the lower end surface of the upper steel pipe, the upper column main reinforcement is arranged inside the upper steel pipe, and the upper column main reinforcement is erecting the built-in upper steel pipe on top of the lower steel pipe;
welding the lower steel pipe and the upper steel pipe;
and a step of placing concrete in at least the inside of the lower steel pipe.

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