JP2017137690A - Structure for reinforcing steel pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for reinforcing a steel pipe, which can increase the buckling strength and axial strength of the steel pipe and which can facilitate execution of work.SOLUTION: A structure 1 for reinforcing a steel pipe, which is provided in an existing structure 11 to reinforce a steel pipe 2 constituting a structure, includes a rein forcing filler (filler) 4 which is infilled into a reinforcement object range 16 within the steel pipe 2, and a long bolt (anchorage member) 5 which passes through the steel pipe 2 to be inserted into the reinforcing filler 4 and anchored to the reinforcing filler 4 and which is fixed to the steel pipe 2.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a steel pipe reinforcing structure which is provided in an existing structure and forms a structure.

Conventionally, whether the steel pipe truss beams installed in existing structures are sufficiently resistant to external forces during earthquakes and snowfalls is determined by the buckling strength of the steel pipe that is the compression material of the steel pipe truss beams and axial compression. Often done based on intensity values. When performing seismic reinforcement of a steel pipe truss beam, reinforcement is often performed to increase the buckling strength and axial strength (axial compression strength) of the steel pipe truss beam.
As a method of reinforcing a steel pipe of a steel pipe truss beam, a method of reinforcing the cross section of the steel pipe by welding is known. However, such a method has a risk of fire occurrence due to welding, and it is difficult to perform a welding operation at a high place. Therefore, a steel pipe reinforcing method that does not require welding has been proposed.

For example, a steel pipe is sandwiched from both sides with a reinforcing member formed by vertically dividing a new steel pipe, and the reinforcing member is fixed to the steel pipe with a band material, or a steel pipe is sandwiched from both sides by a reinforcing member obtained by dividing a new steel pipe vertically. A method has been proposed in which these reinforcing members are fixed to each other with a fixing tool such as a bolt and the reinforcing member is fixed to the steel pipe.
Patent Document 1 discloses a method of reinforcing a steel pipe by forming a hole in the steel pipe and filling a cement-based solidified material into the steel pipe from the hole.

JP 2000-170323 A

However, the method of fixing the reinforcing member to the steel pipe is effective for increasing the buckling strength, but is not effective for increasing the axial strength. Moreover, in this method, since it is necessary to integrate a reinforcement member with a steel pipe, there exists a problem that high dimensional accuracy is calculated | required for the process of a reinforcement member, and a process of a reinforcement member takes time. If the dimensional accuracy of the reinforcing member is low, the reinforcing member and the steel pipe are not integrated, and the reinforcing effect by the reinforcing member may not be sufficiently obtained. In addition, there is a problem in that the cross-sectional shape of the member is increased and the appearance is changed by fixing the reinforcing member to the steel pipe.
The method disclosed in Patent Document 1 is also effective in increasing the buckling strength because the steel pipe and the cementitized solid material are insulated without being integrated, but it is effective in increasing the shaft strength. It is not valid.
In addition, even if the steel pipe and cementitious solidified material are integrated, the upper limit of the axial force that can be transmitted by adhesion is determined by the inner area of the steel pipe, so if the axial strength is greatly insufficient, the reinforcing strength is insufficient There is a problem.

  Therefore, an object of the present invention is to provide a steel pipe reinforcing structure and a steel pipe reinforcing method that can increase the buckling strength and axial strength of the steel pipe and can be easily constructed.

  In order to achieve the above object, a steel pipe reinforcement structure according to the present invention is provided in an existing structure, and in a steel pipe reinforcement structure that reinforces a steel pipe constituting a structure, the steel pipe reinforcement structure is filled in a reinforcement target range inside the steel pipe. And a fixing member that penetrates through the steel pipe and is inserted into the filler to be fixed to the filler, and is fixed to the steel pipe.

  Further, in the steel pipe reinforcing method according to the present invention, in the steel pipe reinforcing method provided in an existing structure for reinforcing the steel pipe constituting the structure, the inside and outside of the steel pipe are communicated within the reinforcing target range of the steel pipe. A first hole forming step for forming one hole, a fixing member fixing step for inserting a fixing member into the steel pipe from the first hole, and fixing the fixing member to the steel pipe; and an interior of the steel pipe And a filler filling step of filling the filler within the range to be reinforced and fixing the filler and the fixing member.

In the present invention, the buckling strength of the steel pipe can be increased by filling the steel pipe with the filler. Further, since the filler adheres to the steel pipe and the steel pipe and the filler are integrated via the fixing member, axial force can be transmitted between the steel pipe and the filler. Yield strength can be increased.
In addition, since the fixing member is fixed to the steel pipe and the inside of the steel pipe is filled with a filler to fix the filler and the fixing member, the construction can be easily performed.

In the steel pipe reinforcing structure according to the present invention, the fixing member may penetrate the steel pipe and the filler, and both end portions may be fixed to the steel pipe.
By adopting such a configuration, the fixing member is fixed to the steel pipe at two locations, so that the fixing member can be securely fixed to the steel pipe, and the axial force is transmitted between the steel pipe and the filler via the fixing member. Can be performed reliably.

In the steel pipe reinforcing structure according to the present invention, the fixing member may have a structure in which one end side is inserted into the filler and the other end side is fixed to the steel pipe.
By adopting such a configuration, since the fixing member is fixed to the steel pipe at one place, the number of fixing places is smaller than when the fixing member is fixed to the steel pipe at two places, so that the appearance can be improved.

  Further, in the steel pipe reinforcing structure according to the present invention, the steel pipe has a closing member that is disposed outside the reinforcing target range inside the steel pipe and closes the inside of the steel pipe, and the closing member includes a bag body and the bag body. It is good also as a structure which has the filler for closure members filled.

  Further, in the steel pipe reinforcing method according to the present invention, before the filler filling step, a second hole forming step of forming a second hole communicating the inside and outside of the steel pipe outside the reinforcing target range of the steel pipe; A third hole forming step for forming a third hole for communicating the inside and the outside of the steel pipe within a range to be reinforced of the steel pipe, a bag body is inserted into the steel pipe from the second hole, and the bag A filling member forming step of filling the inside of the body with a filling material for a closing member to form a closing member for closing the inside of the steel pipe, and in the filling material filling step, the steel pipe is formed from the third hole. It is good also as a structure filled with the said filler within the reinforcement object range in an inside.

By adopting such a configuration, the inside of the reinforcement target range inside the steel pipe is separated from the outside of the reinforcement target range by the closing member, so that the desired region (within the reinforcement target range) can be easily filled with the reinforcing filler. can do.
Moreover, since the closing member is the structure which filled the inside of the bag body inserted in the inside of the steel pipe with the filler for closing members, the closing member can be installed easily.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to increase the buckling strength and axial strength of a steel pipe, it can construct easily.

It is a figure which shows an example of the steel pipe truss beam which employ | adopted the reinforcement structure of the steel pipe by embodiment of this invention. It is a longitudinal cross-sectional view of FIG. (A) is the sectional view on the AA line of FIG. 1, (b) is the sectional view on the BB line of FIG. FIG. 3 is an enlarged view of part C of FIG. 2. (A) is a figure explaining the 1st hole formation process, the 2nd hole formation process, and the 3rd hole formation process, and is the figure which looked at the steel pipe of the lower chord material from the upper part, and (b) is D- of (a). It is D line sectional drawing. (A) is a figure explaining a fixing member fixing process, and is the figure which looked at the steel pipe of the lower chord material from upper direction, (b) is the EE sectional view taken on the line of (a). It is a figure explaining a blocking member formation process. It is a figure explaining the closing member formation process following FIG. It is a figure explaining the filler filling process for a reinforcement. It is a figure which shows the assumption failure mode in the shear transmission between a steel pipe and a concrete part when a long bolt yields. It is a figure which shows the assumption failure mode in the shear transmission between a steel pipe and a concrete part when the concrete part inside a steel pipe destroys. It is a figure which shows the modification of embodiment of this invention.

Hereinafter, a steel pipe reinforcing structure and a steel pipe reinforcing method according to an embodiment of the present invention will be described with reference to FIGS. 1 to 11.
As shown in FIGS. 1 and 2, the steel pipe reinforcing structure 1 according to the present embodiment is used when reinforcing a steel pipe truss beam 12 of an existing structure 11. The steel pipe truss beam 12 includes an upper chord member 13 and a lower chord member 14 extending in the horizontal direction, and a plurality of diagonal members 15, 15... Provided between the upper chord member 13 and the lower chord member 14.
The upper chord member 13, the lower chord member 14, and the plurality of diagonal members 15, 15,... The plurality of diagonal members 15, 15... Are joined to the upper chord member 13 and the lower chord member 14, respectively, by welding or the like.
In the present embodiment, a predetermined length range of the lower chord member (structure) 14 is set as a reinforcement target range 16, and the steel pipe reinforcement structure 1 is applied to the reinforcement target range 16.

  As shown in FIG. 2, the reinforced lower chord material 14 (steel pipe reinforcement structure 1) is provided on each of the steel pipe 2 extending in the horizontal direction and both outer sides in the length direction of the reinforcement target range 16 inside the steel pipe 2. A pair of blocking members 3, 3, a reinforcing filler (filler) 4 filled between the pair of blocking members 3, 3, the steel pipe 2 and the reinforcing filler 4, and fixed to the steel pipe 2. A long bolt (fixing member) 5.

  The steel pipe 2 is an existing one, and a pair of closing members 3, 3, a reinforcing filler 4 and a long bolt 5 are newly provided inside the steel pipe 2 in order to reinforce the lower chord material 14. As shown in FIGS. 2 and 3 (a), the steel pipe 2 is in a hollow state outside the reinforcement target range 16 of the lower chord member 14 (see FIG. 2). As shown in FIG. 2 and FIG. 3 (b), in the reinforcing object range 16 (see FIG. 2) of the lower chord material 14, the steel pipe 2 is filled with the reinforcing filler 4 and the steel pipe 2 is connected to the long bolt 5. Has penetrated.

As shown in FIG. 4, the pair of blocking members 3, 3 are arranged so as to sandwich the reinforcement target range 16 with a gap in the length direction (the length direction of the steel pipe 2), and the inside of the steel pipe 2 is long. It is divided into one side and the other side in the vertical direction. Each of the pair of closing members 3, 3 has a stretchable bag 31 made of synthetic resin, and a filler 32 for a closing member such as a cement-based solidified material filled in the bag 31. . The bag 31 is configured to be inflated by being filled with a filler 32 for a closing member, so that the inside of the steel pipe 2 can be closed so that one side and the other side in the length direction do not communicate with each other.
For the reinforcing filler 4, for example, a non-shrinkable cement-based solidified material is used. The reinforcing filler 4 is cured and integrated with the steel pipe 2 and is fixed to the long bolt 5.

  The steel pipe 2 has a pair of plugging member holes for inserting the bag members 31 and 31 and the plugging member fillers 32 and 32 of the pair of plugging members 3 and 3 outside the reinforcement target range 16 into the steel pipe 2. Parts (second hole parts) 21, 21, a reinforcing hole part (third hole part) 22 for filling the reinforcing object range 16 with the reinforcing filler 4, and a reinforcing pipe filled in the steel pipe 2 A confirmation hole 23 for confirming the state of the filler 4 and four long bolt holes (first hole) 24, 24,... Through which the long bolt 5 is inserted are formed.

The two blocking member holes 21 and 21 are respectively formed on the upper side of the steel pipe 2.
The reinforcing hole portion 22 and the confirmation hole portion 23 are formed to be spaced from each other in the length direction. The reinforcing hole 22 is formed on the lower side of the steel pipe 2, and the confirmation hole 23 is formed on the upper side of the steel pipe 2.
The blocking member hole portions 21 and 21, the reinforcing hole portion 22, and the confirmation hole portion 23 are respectively provided with a sealing material 25 after the pair of blocking members 3 and 3 and the reinforcing filler 4 are provided inside the steel pipe 2. It is blocked by.

  Two long bolt holes 24A, 24A among the four long bolt holes 24, 24, 24... Are formed on the upper side of the steel pipe 2 at intervals in the length direction. The bolt holes 24B and 24B are formed on the lower side of the steel pipe 2 with a gap in the length direction. If the long bolt holes 24A, 24A are the upper long bolt holes 24A, 24A and the long bolt holes 24B, 24B are the lower long bolt holes 24B, 24B, the upper long bolt holes 24A, 24A and lower long bolt holes 24B and 24B are arranged at positions overlapping in the vertical direction, and face each other in a direction perpendicular to the axis of the steel pipe 2.

The long bolt 5 has a head portion 51 and a screw portion 52, and has a known structure in which a nut 53 can be screwed. When the long bolt 5 is inserted into the upper long bolt hole 24 </ b> A and the lower long bolt hole 24 </ b> B that overlap in the vertical direction, the long bolt 5 is arranged so that its axis is orthogonal to the axis of the steel pipe 2.
In the present embodiment, the long bolt 5 includes the upper long bolt hole portion 24A and the lower long bolt hole portion 24B that overlap in the vertical direction from the upper side of the steel pipe 2 in the direction in which the head portion 51 is above the screw portion 52. A threaded portion 52 is inserted through the screw. In the long bolt 5, the head 51 comes into contact with the outer peripheral surface of the steel pipe 2 via the plate material 54, and the distal end portion (the end opposite to the head 51 side) of the screw portion 52 is located below the steel pipe 2. The nut 53 protrudes and is screwed into a portion below the steel pipe 2. And the long volt | bolt 5 is being fixed to the steel pipe 2 by being tightened by the thread part 52 so that a nut may contact | abut with the outer peripheral surface of the steel pipe 2 via the plate material 54. FIG. The plate material 54 is made of a washer or a steel plate in which a hole portion through which the screw portion 52 can be inserted is formed.
Of the screw portion 52 of the long bolt 5 fixed to the steel pipe 2, the inner portion of the steel pipe 2 is fixed to the reinforcing filler 4.

Next, a method for reinforcing the lower chord material 14 (a method for reinforcing a steel pipe) will be described.
First, as shown in FIG. 5, upper long bolt holes 24A and 24A are formed on the upper side of the reinforcement target range 16 of the steel pipe 2 of the lower chord member 14, and lower long bolt holes 24B and 24B are formed on the lower side. (First hole forming step).
A pair of blocking member holes 21 and 21 are formed on the upper sides of both outer sides in the length direction of the reinforcing target range 16 of the steel pipe 2 (second hole forming step). In the present embodiment, the inner diameter of each of the pair of blocking member holes 21 and 21 is about 30 mm.
A reinforcing hole 22 is formed on the lower side of the reinforcing object range 16 of the steel pipe 2, and a confirmation hole 23 is formed on the upper side (third hole forming step). In the present embodiment, the inner diameter of the reinforcing hole 22 and the inner diameter of each of the confirmation holes 23 are about 30 mm.
In addition, the order which performs a 1st-3rd hole part formation process may be set suitably, and after forming the hole part formed in the upper part side of the steel pipe 2, the hole part formed in the lower part side of the steel pipe 2 is formed. You may make it do.

Then, as shown in FIG. 6, the long volt | bolt 5 is fixed to the steel pipe 2 (long volt | bolt fixing process).
The long bolt 5 is inserted into the steel pipe 2 from the upper long bolt hole, the head 51 of the long bolt 5 is brought into contact with the steel pipe 2 via the plate material 54, and the screw portion 52 of the long bolt 5 is The tip is protruded from the lower long bolt hole to the lower side of the steel pipe 2. Then, the plate material 54 is inserted into the threaded portion 52 of the long bolt 5 protruding downward, and the nut 53 is screwed to fix the long bolt 5 to the steel pipe 2.

Subsequently, as shown in FIGS. 7 and 8, a pair of closing members 3 and 3 (see FIG. 8) are respectively formed inside the steel pipe 2 (blocking member forming step).
As shown in FIG. 7, the bag bodies 31, 31 in a contracted state are inserted into the steel pipe 2 through the blocking member holes 21, 21. The filling ports 31 a of the bag bodies 31, 31 inserted into the steel pipe 2 are arranged in the vicinity of the closing member hole portions 21, 21.
The inside of the bag body 31 is filled with the filler 32 for the closing member from the filling port 31a of the bag body 31 inserted into the steel pipe 2.
As shown in FIG. 8, the bag body 31 expands and expands by being filled with the closing member filler 32. The inside of the bag body 31 is filled with the closing member filler 32 until the bag body 31 is large enough to close the steel pipe 2.
When the bag body 31 and the closing member filler 32 are large enough to block the steel pipe 2, the filling of the closing member filler 32 into the bag body 31 is terminated, and the filling port 31a of the bag body 31 is closed.

Subsequently, as shown in FIG. 9, the reinforcing filler 4 is filled into the reinforcing target range 16 inside the steel pipe 2 (filler filling step).
The reinforcing filler 4 is filled into the steel pipe 2 from the reinforcing hole 22. At this time, the state of the reinforcing filler 4 injected into the steel pipe 2 is confirmed from the confirmation hole 23. In the present embodiment, the confirmation hole portion 23 also serves as an air outlet inside the steel pipe 2 when the reinforcing filler 4 is injected from the reinforcing hole portion 22 into the steel pipe 2.
The pair of closing members 3, 3 become a form of the reinforcing filler 4, and even if the reinforcing filler 4 reaches the pair of closing members 3, 3, the reinforcing filler 4 flows out of the reinforcement target range 16. To prevent it.
When the reinforcing filler 4 is filled in the reinforcing object range 16, as shown in FIG. 4, the closing member holes 21, 21, the reinforcing hole 22, and the confirmation hole 23 are closed with a sealing material 25 or the like. Then, the reinforcing filler 4 is cured and integrated with the steel pipe 2 and fixed with the long bolt 5.

Next, the reinforcement design of the steel pipe will be described.
When the buckling strength of the steel pipe 2 is insufficient, the reinforcement design of the buckling strength is performed, and when the axial strength of the steel pipe 2 is insufficient, the reinforcement design of the shaft strength is performed. In the present embodiment, both the buckling strength reinforcement design and the shaft strength reinforcement design of the steel pipe 2 are performed.
In addition, the buckling strength and axial strength of the steel pipe 2 after reinforcement shall conform to a concrete filling steel pipe structure design and construction guideline (Architectural Institute of Japan, published in October 2008).

  The buckling strength of the steel pipe 2 after reinforcement is a cumulative buckling strength obtained by accumulating the buckling strength of the steel pipe 2 and the buckling strength of the reinforcing filler 4 (concrete portion) filled in the reinforcing object range 16. The buckling strength of the steel pipe 2 after reinforcement, the buckling strength of the concrete portion, and the buckling strength of the steel pipe 2 are shown in the following equations (1) to (3).

  Each value is set so that the buckling strength of the steel pipe 2 after reinforcement is equal to or greater than the target buckling strength.

The axial strength of the steel pipe 2 after reinforcement is the axial strength of the steel pipe 2, the axial force transmitted from the steel pipe 2 to the concrete portion due to the adhesion between the steel pipe 2 and the concrete portion, and the shear force of the long bolt 5 to the concrete portion. Calculate by adding the axial force transmitted to. In addition, when a fiber reinforced cement is used as the reinforcing filler 4, the axial strength of the tensile material can be increased by accumulating the tensile strength of the fiber reinforced cement which is rich in toughness on the tensile side.
The axial force transmitted from the steel pipe 2 to the concrete part due to the adhesion between the steel pipe 2 and the concrete part is shown in the following expressions (4) and (5).

The axial force transmitted from the steel pipe 2 to the concrete part due to the shearing of the long bolt 5 is based on the design of various anchor bolts of various composite structural design guidelines and explanations (issued by the Architectural Institute of Japan, issued April 2011). Calculated by In this embodiment, since the long bolt 5 penetrates the steel pipe 2 and both ends are fixed to the steel pipe 2, the required fixing length of the long bolt 5 in the concrete portion is the yield of the long bolt 5 regardless of the fixing length. As it is secured, it is not considered.
FIG. 10 shows an assumed failure mode in shear transmission between the steel pipe 2 and the concrete part (reinforcing filler 4) when the long bolt 5 yields. FIG. 11 shows a concrete part inside the steel pipe 2. An assumed failure mode in shear transmission between the steel pipe 2 and the concrete portion when the (reinforcing filler 4) is broken is shown. In FIG. 11, the cone fracture surface 71 is indicated by a two-dot chain line, and the region of the concrete portion on the side farther from the long bolt 5 than the cone fracture surface 71 (left side of the cone fracture surface 7 in FIG. 11) is the cone fracture region 72. Is shown.
The bearing fracture strength of the steel pipe 2 (base material) is determined by the following equations (6) to (10).

Next, operations and effects of the steel pipe reinforcing structure 1 and the steel pipe reinforcing method according to the above-described embodiment will be described.
In the steel pipe reinforcement structure 1 according to the above-described embodiment, the buckling strength of the steel pipe 2 can be increased by filling the reinforcing pipe 4 into the steel pipe 2. In addition, the reinforcing filler 4 adheres to the steel pipe 2, and the steel pipe 2 and the reinforcing filler 4 are integrated via the long bolt 5, so that the shaft between the steel pipe 2 and the reinforcing filler 4 is integrated. Since the force can be transmitted, the axial strength of the steel pipe 2 can be increased.
Further, since the long bolt 5 is fixed to the steel pipe 2 and the reinforcing filler 4 and the long bolt 5 are fixed by filling the inside of the steel pipe 2 with the reinforcing filler 4, the construction can be easily performed. it can.
Moreover, the axial proof stress of the steel pipe 2 can be made into arbitrary values by setting the number and position of the long volt | bolt 5 fixed to the steel pipe 2. FIG.

Further, since the long bolt 5 penetrates the steel pipe 2 and the reinforcing filler 4 and both ends are fixed to the steel pipe 2, the long bolt 5 is fixed to the steel pipe 2 at two locations. Can be reliably fixed to the steel pipe 2, and the axial force between the steel pipe 2 and the reinforcing filler 4 can be reliably transmitted via the long bolt 5.
In the steel pipe reinforcing structure 1 according to the present embodiment, only the head 51 of the long bolt 5, the vicinity of the tip of the screw portion 52, the nut 53, and the plate materials 54 and 54 are exposed outside the steel pipe 2. Therefore, the steel pipe 2 can be reinforced with almost no change in the cross-sectional shape and appearance of the lower chord material 14.

In the steel pipe reinforcing structure 1, the pair of blocking members 3, 3 separates the inside of the reinforcing target range 16 and the outside of the reinforcing target range 16 inside the steel pipe 2 by the pair of blocking members 3, 3. Therefore, the reinforcing filler 4 can be easily filled in a desired region (within the reinforcement target range 16).
Further, since the pair of closing members 3, 3 are configured to fill the inside of the bag bodies 31, 31 inserted inside the steel pipe 2 with the fillers 32, 32 for the closing member, the closing members are inserted inside the steel pipe 2. 3 can be installed easily.

As mentioned above, although embodiment of the reinforcement structure of the steel pipe by this invention and the reinforcement method of a steel pipe was described, this invention is not limited to said embodiment, In the range which does not deviate from the meaning, it can change suitably.
For example, in the above embodiment, the long bolt 5 has the threaded portion 52 penetrating the steel pipe 2 and the tip portion protruding outward from the steel pipe 2, but the long bolt 5B of the steel pipe reinforcing structure 1B shown in FIG. As described above, the configuration may be such that the tip of the screw portion 52 is inserted into the reinforcing filler 4 and the nut is not screwed into the screw portion 52. In such a case, it is necessary to secure the fixing length le of the screw portion 52 fixed to the reinforcing filler 4 in accordance with various synthetic structure design guidelines and explanations (Japan Architectural Institute, issued in April 2011). is there.

In the above embodiment, the fixing member fixed to the steel pipe 2 and fixed to the reinforcing filler 4 is the long bolt 5, but a member other than the long bolt 5 may be used.
In the above embodiment, the two long bolts 5 are provided in the reinforcement target range 16, but the number and position of the long bolts 5 may be set as appropriate. Moreover, when several long volt | bolt 5,5 ... is installed, several long volt | bolt 5,5 ... each direction may differ.

In the above embodiment, the lower chord member 14 of the steel pipe truss beam 12 is reinforced. However, the steel pipe reinforcement structure 1 and the steel pipe reinforcement method according to the present embodiment may be adopted to reinforce the upper chord member and the diagonal member. Good. The form of the steel pipe truss beam 12 may be other than the above.
Further, in the above embodiment, the closing members 3 and 3 are provided on both outer sides in the length direction of the reinforcement target range 16 inside the steel pipe 2, but either one of the length directions of the reinforcement target range 16 is provided. When the side is closed, the closing member 3 may be provided only on the other side.
Further, in the above embodiment, the bag body 31 of the closing member 3 is configured to be extendable and retractable. However, if the inside of the steel pipe 2 can be closed together with the closing member filling material 32 filled therein. It is not necessary to expand and contract.
Further, the method of filling the reinforcing material into the steel pipe 2 may be a method other than the above, and the closing member 3 may not be provided. Further, the reinforcing filler 4 may be filled in the entire inside of the steel pipe 2.

1,1B Steel pipe reinforcement structure 2 Steel pipe 3 Closing member 4 Reinforcing filler (filler)
5,5B Long bolt (fixing member)
11 Existing structure 14 Lower chord material (structure)
16 Reinforcement target range 21 Closing member hole (second hole)
22 Reinforcing hole (third hole)
23 Check hole 24 Long bolt hole (1st hole)
24A Upper Long Bolt Hole (First Hole)
24B Lower Bolt Hole (First Hole)
31 Bag body 32 Filling material for closing member

Claims (6)

In a steel pipe reinforcement structure that is provided in an existing structure and reinforces a steel pipe that forms the structure,
A filler filled in a reinforcing object range inside the steel pipe;
A reinforcing structure for a steel pipe, comprising: a fixing member that penetrates the steel pipe and is inserted into the filler to be fixed to the filler, and is fixed to the steel pipe.   The reinforcing structure for a steel pipe according to claim 1, wherein the fixing member penetrates the steel pipe and the filler, and both end portions are fixed to the steel pipe.   2. The steel pipe reinforcing structure according to claim 1, wherein one end side of the fixing member is inserted into the filler, and the other end side is fixed to the steel pipe. It is disposed outside the reinforcement target range in the steel pipe, and has a closing member that closes the inside of the steel pipe,
The reinforcing structure for a steel pipe according to any one of claims 1 to 3, wherein the closing member has a bag body and a filler for the closing member filled in the bag body. In a steel pipe reinforcing method for reinforcing a steel pipe that is provided in an existing structure and forms the structure,
A first hole forming step for forming a first hole for communicating the inside and outside of the steel pipe within a reinforcing target range of the steel pipe;
A fixing member fixing step of inserting a fixing member into the steel pipe from the first hole, and fixing the fixing member to the steel pipe;
A method for reinforcing a steel pipe, comprising: a filler filling step of filling a filler within the reinforcing object range inside the steel pipe and fixing the filler and the fixing member. Before the filler filling step,
A second hole forming step for forming a second hole for communicating the inside and outside of the steel pipe outside the reinforcement target range of the steel pipe;
A third hole forming step for forming a third hole for communicating the inside and outside of the steel pipe within the reinforcing target range of the steel pipe;
Inserting a bag body into the steel pipe from the second hole, filling the inside of the bag body with a filler for a closing member, and forming a closing member for closing the inside of the steel pipe; and And
6. The method for reinforcing a steel pipe according to claim 5, wherein, in the filler filling step, the filler is filled from the third hole into a reinforcing target range inside the steel pipe.

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