Blocking material for steam vents in steel pipe concrete columns

Abstract

The sealing material prevents concrete from flowing out after concrete pouring through steam vents formed between the inner and outer surfaces of the steel pipes that make up the steel-pipe concrete column, while allowing steam generated from within the concrete during a fire to pass through. It also prevents the main body of the sealing material that closes the steam vents from falling into the steel pipe if it is severed by heat, impact, or other external forces such as tensile force. [Solution] The plug material 2 has a main body portion 21 that can be melted in the event of a fire, has a cross-sectional area that can be in contact with the steam vent hole 71 and a length that exceeds the total length of the steam vent hole 71, and is positioned inside the steam vent hole 71. The sealing material 1 is made up of a spring material 3 that is attached to the main body portion 21 and has a locking portion 31 that locks onto the inner circumferential surface 7a of the steel pipe 7. The falling prevention material 4 has a locking portion 41 that locks onto the outer circumferential surface 7b of the steel pipe 7 when the main body portion 21 is inserted into the steam vent hole 71.

Description

Technical Field

[0001] The present invention relates to a plugging material for a steam vent hole of a concrete-filled steel pipe column, which prevents the outflow of concrete after casting from a steam vent hole formed through the inner peripheral surface and the outer peripheral surface of the steel pipe constituting the concrete-filled steel pipe column, and allows steam generated from the concrete during a fire to pass through.

Background Art

[0002] In the steel pipe of a concrete-filled steel pipe column in which concrete is filled in the steel pipe, when the concrete reaches a high temperature during a fire in a structure, the water contained in the concrete becomes steam and expands in volume, so measures such as forming steam vent holes to prevent the rupture of the steel column are obligatory (see Non-Patent Documents 1 and 2).

[0003] If the steam vent hole is not filled with a filling material (plugging material), the concrete will enter the steam vent hole during the filling (casting) of the concrete. Therefore, it is necessary to remove the concrete clogged in the wall thickness part in the steam vent hole using tools after the filling of the concrete. Therefore, it is necessary to fill some filling material in the steam vent hole before filling the concrete.

[0004] Specifically, the filling materials are mainly classified into cases where they are plugs made of wood, plastic, etc. that are easily lost (burned out) in a fire (see Non-Patent Documents 2, Patent Documents 1 and 2), and cases where they are steel bolts, etc. that are removed after the concrete hardens (see Non-Patent Documents 2, Patent Documents 3 to 5).

[0005] The filling condition of the concrete is confirmed, for example, by inserting a sponge-like permeable member into a through hole formed in the center of the filling material and allowing the noro to permeate into the permeable member after the filling of the concrete (Patent Document 1). In addition, there is a method of inserting the filling material into the steam vent hole after confirming the filling of the concrete (Patent Document 2).

[0006] In Patent Document 1, the entire outer surface of the filler material is in close contact with the inner surface of the steam vent hole, and the claw portion is locked to the steel pipe. Therefore, it is considered that the filler material is stable against being pulled out due to lateral pressure during concrete filling. However, the lateral pressure of the concrete also acts on the permeable member inserted into the through-hole of the filler material, whereas the permeable member maintains its inserted state only by the frictional force in a compressed state (paragraph 0013). Therefore, there is a possibility that the permeable member may be subjected to lateral pressure and detach from the filler material.

[0007] In Patent Document 2, the condition of the concrete filling is checked before inserting the filler into the steam vent hole (paragraphs 0019, 0030), making it difficult to prevent or completely prevent leakage of concrete from the steam vent hole. However, it is thought that if the filler is filled before the concrete is filled, leakage of the slurry can be prevented. However, since there is a gap between the outer surface of the part of the filler other than the intermediate piece formed in the axial middle part and the inner surface of the steam vent hole (Figure 1), the filler itself can move within the steam vent hole, raising concerns about safety against detachment due to lateral pressure of the concrete.

[0008] In response to these examples, the applicant has proposed a closure material comprising a plug having a cross-sectional area that can be inscribed in the steam vent hole and a length exceeding the total length of the steam vent hole, and a spring material held by the plug and having a locking portion that can engage with the periphery of the steam vent hole from the inner circumferential surface side to the outer circumferential surface side of the steel pipe (see Patent Document 6). [Prior art documents] [Non-patent literature]

[0009] [Non-Patent Document 1] "Regarding the establishment of necessary safety technical standards for the structural methods of concrete-filled steel pipe buildings or structural parts of buildings," Ministry of Land, Infrastructure, Transport and Tourism Notification No. 464 [Non-Patent Document 2] "Technical Guidelines and Commentary for Concrete-Filled Steel Tube (CFT) Construction," Japan Building Center, Chapter 2 [Patent Documents]

[0010] [Patent Document 1] Japanese Patent Publication No. 2001-262833 (Claim 1, paragraphs 0012-0023, Figures 1-6) [Patent Document 2] Japanese Patent Publication No. 2004-124426 (Claim 5, paragraphs 0028-0031, Figures 4 and 5) [Patent Document 3] Japanese Patent Publication No. 2002-206312 (Claim 2, paragraphs 0020-0030, Figures 1-3) [Patent Document 4] Japanese Patent Publication No. 2003-166309 (paragraphs 0009-0011, Figures 1-3) [Patent Document 5] Japanese Patent Publication No. 2013-194383 (Claim 1-5, paragraphs 0038-0044, Figure 1, Figure 2) [Patent Document 6] Japanese Patent Publication No. 2024-65330 (Claim 1, paragraphs 0014-0059, Figures 1-4) [Overview of the project] [Problems that the invention aims to solve]

[0011] However, in the sealing material described in Patent Document 6, the main body of the plug, which is located inside the steam vent hole, and the knob, which is located outside the steam vent hole and is thicker than the main body, may separate due to external forces such as impacts from materials colliding with the steel pipe, as well as effects from heat during welding, and the main body may fall into the steel pipe. If the main body falls, it will interfere with the concrete filling process, so the main body must be recovered by some means, such as drilling a hole in the steel pipe.

[0012] Furthermore, when a notched retaining portion is formed on the main body of the plug material according to Patent Document 6 (Claim 3), the retaining portion results in a cross-sectional defect, making the portion of the main body other than the retaining portion more susceptible to fracture under external forces such as tensile force and shear force. If fracture occurs, the same treatment as in the case of separation is required.

[0013] Based on the above background, the present invention proposes a steam vent blockage material that overcomes the weaknesses of the plug material (main body) of Patent Document 6 and has a main body that is highly safe against breakage or fracture. [Means for solving the problem]

[0014] The sealing material for a steam vent hole in a steel pipe concrete column according to claim 1 is a sealing material that is inserted from the outer surface side of the steel pipe into a steam vent hole formed by penetrating between the inner surface and the outer surface of the steel pipe constituting the steel pipe concrete column, and seals the steam vent hole from the inner surface side of the steel pipe until the concrete filling into the steel pipe is completed and the concrete loses its fluidity. A plug having a melting point that allows it to melt in the event of a fire, a cross-sectional area that can be inscribed within the steam vent hole, and a length that exceeds the total length of the steam vent hole, and positioned within the steam vent hole; and a plug having a knob that is continuous with the main body and located on the outer surface side of the steel pipe, The plug material is fitted to the main body and has a spring material having a locking portion that engages with the inner circumferential surface of the steel pipe toward the outer circumferential surface when the main body is inserted into the steam vent hole, A fall prevention material is attached to the knob side of the main body of the stopper material, having a locking portion that engages with the outer surface of the steel pipe toward the inner surface when the main body is inserted into the steam vent hole. A connecting member is positioned between the spring material and the fall prevention material, and the connecting member is positioned across the spring material and the fall prevention material to engage with both of them. The constituent element is that this is the case.

[0015] "Having a melting point that allows it to melt in the event of a fire" means that the stopper material has a melting point of around several tens to 100°C, which allows it to melt to the extent that it does not retain its original shape in the event of a fire and can release the blockage of the steam vent. Molded products of synthetic resins or solid special waxes are mainly used for the stopper material (main body), but the material is not particularly limited as long as it has a melting point that satisfies the conditions and has the processability to form notches and grooves. The main body is mainly formed by filling the inside of a mold with the above material (raw material) in its fluid state before molding and allowing it to solidify. "Mainly" means that the molded product after solidification may be used as the main body.

[0016] The plug material only needs to substantially block the steam vent holes until the filling of concrete into the steel pipe is completed and the concrete loses its fluidity. During a fire in the structure, it melts to promote the discharge of the vaporized moisture contained in the concrete from the steam vent holes.

[0017] "Having a cross-sectional area that can be inscribed in the steam vent hole" means that, as shown in Fig. 4-(a), in the state where the plug material 2 is inserted into the steam vent hole 71, at least a part of the outer peripheral surface of the main body portion 21 of the plug material 2 in the axial direction can contact the inner peripheral surface of the steam vent hole 71, and in the state where the spring material 3 is mounted, the main body portion 21 has a cross-sectional area that substantially covers the inner peripheral surface of the steam vent hole 71. The state where a part of the main body portion 21 in the axial direction is inscribed in the steam vent hole 71 includes the case where the surface layer portion on the outer peripheral surface side of the main body portion 21 adheres to the inner peripheral surface of the steam vent hole 71 while being scraped by the outer peripheral surface 7b of the steel pipe 7, or the case where the main body portion 21 contracts from the outer peripheral side toward the axial center side. The "portion that contracts from the outer peripheral side toward the axial center side" when the main body portion 21 contracts only needs to be at least a part of the main body portion 21 in the axial direction.

[0018] Since the main body portion 21 of the plug material 2 has a cross-sectional area that can be inscribed in the steam vent hole 71, when the concrete 8 is filled into the steel pipe 7 in the state where the plug material 2 is inserted into the steam vent hole 71 from the outer peripheral surface 7b side of the steel pipe 7, the outflow of the concrete 8 from the steam vent hole 71 to the outside of the steel pipe 7 is blocked. It is only necessary that the outflow of the concrete 8 is substantially blocked, and a slight amount of slow outflow is allowed.

[0019] "Having a main body portion with a length exceeding the total length of the steam vent hole" means that when the main body portion 21 of the plug material 2 is inserted into the steam vent hole 71, at least one of the inner peripheral surface side and the outer peripheral surface side of the main body portion 21 in the axial direction has a length that protrudes from the steam vent hole 71. "Having a main body portion disposed in the steam vent hole and a grip portion that is continuous with the main body portion and is located on the outer peripheral surface side of the steel pipe" means that when the main body portion 21 is inserted into the steam vent hole 71 and closes the steam vent hole 71, the grip portion 22 protrudes to the outer peripheral surface 7b side of the steel pipe 7.

[0020] The "spring material having a locking portion that is attached to the main body portion of the plug material and locks to the inner peripheral surface of the steel pipe toward the outer peripheral surface side when the main body portion is inserted into the steam vent hole" means that when the main body portion 21 with the spring material 3 is inserted into the steam vent hole 71 from the outer peripheral surface 7b side of the steel pipe 7, the spring material 3 is once deformed by bending etc. toward the axial center side, and when the spring material 3 protrudes toward the inner peripheral surface 7a side of the steel pipe 7, it restores, and the locking portion 31 locks to the inner peripheral surface 7a of the steel pipe 7 toward the outer peripheral surface 7b side.

[0021] When the spring material 3 bends etc. toward the axial center side, due to being pushed by the spring material 3, the main body portion 21 where the portion other than the locking portion 31 of the spring material 3 is in contact may also contract toward the axial center side as shown in Fig. 4-(b), but the surface layer portion of the main body portion 21 may also be inserted into the steam vent hole 71 while being scraped. In the former case, the main body portion 21 is once elastically deformed together with the spring material 3, the locking portion 31 of the spring material 3 passes through the steam vent hole 71 and enters the inner peripheral surface 7a of the steel pipe 7, and has an elasticity to restore simultaneously when restored.

[0022] In addition, as shown in Fig. 2, a notch portion 25 for facilitating the elastic deformation of the spring material 3 may be formed in the portion of the main body portion 21 where the spring material 3 overlaps. The notch portion 25 is formed from the outer peripheral surface side to the center side of the main body portion 21 at a position that is symmetric with respect to the center in the axial direction, for example, at a position where the portion other than the locking portion 31 of the spring material 3 is in contact.

[0023] The spring material 3 is mainly arranged in the main body portion 21 in a state where the main body portion 21 of the material having fluidity before molding is filled inside a mold not shown, and is embedded in the main body portion 21 by the main body portion 21 being solidified as it is. "Mainly" means that the spring material 3 does not necessarily need to be arranged in the main body portion 21 having fluidity, and it means that there may be a case where it is inserted into a cut formed in the main body portion 21 after the main body portion 21 is solidified.

[0024] The statement "A fall prevention material is attached to the knob side of the main body of the stopper material, having a locking portion that engages with the outer surface of the steel pipe toward the inner surface when the main body is inserted into the steam vent hole" means that when the main body 21 is inserted into the steam vent hole 71 from the outer surface 7b side of the steel pipe 7, a fall prevention material 4 having a locking portion 41 that engages with the outer surface 7b of the steel pipe 7 toward the inner surface 7a side is attached to the knob side of the main body 21 and integrated with it. The fall prevention material 4 is embedded and attached within the main body 21 when the main body 21, which is made of fluid material before molding, is filled inside the mold and the main body 21 solidifies.

[0025] Since the fall prevention material 4, which has a locking portion 41 for the steel pipe 7, is embedded in the main body portion 21 of the plug material 2, even if the handle portion 22 separates from the main body portion 21 due to external forces such as impact from materials colliding with the steel pipe 7, or due to the effects of heat during welding, the fall prevention material 4, which is integrated with the main body portion 21, maintains a state of being locked to the outer surface 7b of the steel pipe 7, thus preventing the main body portion 21, which has separated from the handle portion 22, from falling into the inside of the steel pipe 7. By preventing the main body portion 21 from falling into the inside of the steel pipe 7 when the handle portion 22 separates from the main body portion 21, the effort required to retrieve the main body portion 21 in the event of a fall is eliminated.

[0026] Furthermore, a connecting member 5 is positioned between the spring member 3 and the fall prevention member 4, and is secured to both the spring member 3 and the fall prevention member 4. By doing Even if the stopper material 2 separates at a part of the main body 21 rather than at the boundary between the main body 21 and the knob 22, it is possible to avoid the main body 21, which is located on the inner circumferential surface 7a side of the steel pipe 7, falling into the inside of the steel pipe 7. The connecting material 5 is also embedded within the main body 21 when the main body 21, which is a fluid material before molding, is filled inside the mold and solidifies.

[0027] RenSince the binding member 5 engages with both the spring member 3 and the fall prevention member 4, even if any part of the main body 21 separates in the axial direction, the spring member 3 and the fall prevention member 4 embedded in the main body 21 remain connected to each other, preventing any part of the main body 21 from falling into the steel pipe 7 due to separation. As long as any part of the main body 21 remains inside the steam vent hole 71, the function of the main body 21 in closing the steam vent hole 71 is maintained.

[0028] In addition, when the occluding material 1 has a plug material 2 and a spring material 3, as in claim 1, the spring material 3 is embedded in the main body portion 21 of the plug material 2 in advance, thereby being integrated with the main body portion 21. Reference example In this case, as in the case where a notched retaining portion is formed on the main body of the plug material described in Patent Document 6, the portion of the main body other than the retaining portion becomes less likely to break under external forces such as tensile force and shear force. in this case, Since the spring material 3 is pre-embedded within the main body 21, the main body 21, which is made of fluid material before molding, is placed inside the mold when it is filled, and as the main body 21 solidifies, the spring material 3 is embedded within the main body 21.

[0029] As shown in the example in Figure 1 of Patent Document 6, when the spring material 3 is inserted into the notched retaining portion formed in the main body 21 after the main body 21 has been formed (Figure 1), the retaining portion (notch) removes more than half of the cross-sectional area of ​​the main body 21 perpendicular to the axial direction, thus reducing the resistance of the main body 21 to external forces such as tensile and shear forces. As a result, if axial tensile force or shear force perpendicular to the axial direction acts on the main body 21 while the plug material 2 is inserted into the steam vent hole 71, the main body 21 is likely to break and fall into the steel pipe 7.

[0030] In response to this, The above is a reference example. Since the spring material 3 is pre-embedded and integrated within the main body 21, the formation of the retaining portion (notch) shown in Figure 1 of Patent Document 6 is unnecessary. Therefore, even if axial tensile force or the like acts on the main body 21 while the plug material 2 is inserted into the steam vent hole 71, the safety against breakage of the main body 21 is improved, and the possibility of it falling due to breakage is reduced. As a result, the ability of the occluding material 2 to perform its intended function is enhanced.

[0031] Furthermore, if the tip portion 23 on the inner circumferential surface 7a side of the main body portion 21 is made thinner than the other parts in the axial direction, and the intermediate portion 24 on the outer circumferential surface 7b side of the steel pipe 7 is made thicker than the tip portion 23, Claim 2 This makes it easier to insert the plug material 2 into the steam vent hole 71, while also preventing the slurry from leaking out of the steel pipe 7 after concrete 8 has been poured.

[0032] In this case, because the tip 23 of the main body 21 on the steel pipe 7 side is thinner than the other parts in the axial direction, the tip 23 is inserted into the steam vent hole 71 without experiencing frictional resistance from the inner circumferential surface of the steam vent hole 71. Also, because the intermediate section 24 is thicker than the tip 23, it is more likely to come into contact with the inner circumferential surface of the steam vent hole 71 and is more likely to experience resistance from the inner circumferential surface of the steam vent hole 71. However, since the intermediate section 24 is only a portion of the axial direction of the main body 21, the resistance is less than if the entire length of the main body 21 were uniformly thick.

[0033] In addition, the intermediate portion 24 contacts the inner surface of the steam vent hole 71, making it easier to block the slurry after concrete 8 is poured into the steel pipe 7, thereby increasing the effect of preventing slurry leakage. This effect is further improved when the entire circumference of the intermediate portion 24 contacts or tightly adheres to the inner surface of the steam vent hole 71. [Effects of the Invention]

[0034] steaming Because the plug material, equipped with a spring that locks onto the inner surface of the steel pipe when inserted into the vent hole, has a fall prevention material embedded within its main body that locks onto the outer surface of the steel pipe, even if the knob separates from the main body due to impact to the steel pipe or heat during welding, the fall prevention material integrated with the main body can maintain its locking position on the outer surface of the steel pipe, preventing the separated main body from falling into the steel pipe. Therefore, there is no need to retrieve the main body if it falls. In addition, by remaining inside the steam vent hole, the main body maintains its function of blocking the steam vent hole.

[0035] A spring material that locks onto the inner circumference of the steel pipe is pre-embedded within the main body and integrated into the main body. In the case of (example): Unlike cases where a notched retaining section is formed on the main body, the parts of the main body other than the retaining section are not prone to breaking under external forces such as tensile or shear forces. As a result, safety against breakage of the main body is improved, and the possibility of falling due to breakage is reduced, thus eliminating the hassle of retrieving items that have fallen. [Brief explanation of the drawing]

[0036] [Figure 1] (a) is a vertical cross-sectional view showing an example of a blockage material in which a spring material and a fall prevention material are embedded inside the main body of the plug material, (b) is a side view of the blockage material shown in (a), and (c) is a top view of the blockage material shown in (a). [Figure 2] (a) is a vertical cross-sectional view showing an example of a blockage material being manufactured when a fall prevention material with a different shape from that in Figure 1 is embedded inside the main body, and (b) is a plan view of (a). [Figure 3] (a) is a vertical cross-sectional view showing an example of a blockage material being manufactured when a connecting material that connects the spring material and fall prevention material inside the main body is embedded inside the main body; (b) is a side view of the blockage material shown in (a); and (c) is a top view of the blockage material shown in (a). [Figure 4] (a) is a longitudinal cross-sectional view showing the sealing material shown in Figure 1-(a) inserted into the steam vent hole from the outer surface side of the steel pipe, with the tip of the locking part of the spring material locked to the inner surface of the steel pipe. (b) is a longitudinal cross-sectional view showing the sealing material shown in (a) being inserted into the steam vent hole. [Modes for carrying out the invention]

[0037] Figure 1-(a) shows an example of the manufacture of a sealing material 1 that is inserted from the outer surface 7b side of the steel pipe 7 into a steam vent hole 71 formed by penetrating between the inner surface 7a and outer surface 7b of the steel pipe 7 that constitutes the steel pipe concrete column 6 shown in Figure 4, and that closes the steam vent hole 71 from the inner surface 7a side of the steel pipe 7 until the concrete 8 is filled into the steel pipe 7 and the concrete 8 loses its fluidity, as shown in Figure 4-(a). The upper side of the plug material 2 shown in Figure 1-(a) is the inner surface 7a side of the steel pipe 7, and the lower side is the outer surface 7b side of the steel pipe 7.

[0038] The blocking material 1 comprises a plug 2 that closes the steam vent hole 71 and a spring material 3 that is attached to the plug 2. The plug 2 has a main body portion 21 that is placed inside the steam vent hole 71 and a knob portion 22 that is axially continuous with the main body portion 21 and located on the outer circumferential surface 7b side of the steel pipe 7, and the spring material 3 is attached to the main body portion 21 of the plug 2. The main body portion 21 of the plug 2 has a cross-sectional area that can be inscribed inside the steam vent hole 71 and a length that exceeds the total length of the steam vent hole 71.

[0039] The spring material 3 has a locking portion 31 that engages with the inner circumferential surface 7a of the steel pipe 7 toward the outer circumferential surface 7b when the main body portion 21 is inserted into the steam vent hole 71. The spring material 3 has a fixing portion 33 that is held by the main body portion 21 or embedded in the main body portion 21, and an intermediate portion 34 that is continuous from the fixing portion 33 to the locking portion 31, and the tip 32 of the locking portion 31 engages with the inner circumferential surface 7a of the steel pipe 7.

[0040] The stopper material 2 is molded from a material such as synthetic resin or solid wax that has a melting point that allows it to melt in the event of a fire and maintains a solid state at room temperature. In its molded state, it bends when subjected to compressive force acting from a direction perpendicular to the axial direction of the main body 21, and exhibits elasticity that allows it to restore its shape when bent.

[0041] As shown in the example in Figure 1 of Patent Document 6, in order to prevent or suppress the separation of the main body 21 caused by the formation of cuts in the main body 21, it is appropriate that the spring material 3 be placed in the material (raw material) that will become the main body 21, which is filled inside the mold in a fluid state, and then be embedded in the main body 21 as the main body 21 solidifies. Reference exampleIn addition to cases where the spring material 3 is integrally molded with the main body 21, it may also be attached to the main body 21 using notches or the like formed parallel to the axial direction of the main body 21, as shown in the example in Figure 3 of Patent Document 6.

[0042] On the knob portion 22 side of the main body portion 21 of the stopper material 2, a fall prevention material 4 is attached, which has a locking portion 41 that locks or engages with the outer surface 7b of the steel pipe 7 toward the inner surface 7a when the main body portion 21 is inserted into the steam vent hole 71, thereby preventing the main body portion 21 from falling into the steel pipe 7. The fall prevention material 4 serves to prevent the main body portion 21 from detaching from the knob portion 22 and from falling into the steel pipe 7 if the main body portion 21 were to separate from the knob portion 22 for any reason.

[0043] As described above, the fall prevention material 4 is filled into the mold and placed inside the main body 21 of the material, which is in a fluid state. As the main body 21 solidifies, the fall prevention material 4 becomes embedded and integrated within the main body 21, and is attached to the main body 21. The portion of the fall prevention material 4 that is embedded within the main body 21 becomes the fixing portion 42 that integrates with the main body 21.

[0044] When the main body 21 is inserted into the steam vent hole 71, as shown in Figure 1-(a), the tip 32 of the locking portion 31 of the spring material 3 locks onto the inner circumferential surface 7a of the steel pipe 7 on the outer circumferential surface 7b side, and the surface of the locking portion 41 of the fall prevention material 4 that is on the spring material 3 side locks onto the outer circumferential surface 7b of the steel pipe 7 on the inner circumferential surface 7a side, thereby stabilizing the blocking material 1. In this relationship, the distance from the tip 32 of the locking portion 31 to the surface of the locking portion 41 that is on the spring material 3 side is greater than or equal to the thickness of the steel pipe 7 (distance from the inner circumferential surface 7a to the outer circumferential surface 7b).

[0045] In Figure 1, a distance (gap) is maintained between the end of the spring material 3 on the fall prevention material 4 side (fixing portion 33) and the end of the fall prevention material 4 on the spring material 3 side (fixing portion 42). However, this distance is not necessarily required, and the end of the spring material 3 on the fall prevention material 4 side and the end of the fall prevention material 4 on the spring material 3 side may be in contact. In the example in Figure 1, the spring material 3 and the fall prevention material 4 are formed in a shape that is symmetrical with respect to a plane passing through the axis of the main body 21 for ease of placement (attachment) to the main body 21 and for simplicity of shape, but the shapes of the two are not particularly required.

[0046] In Figure 1, the locking portions 31 and 41 of the spring material 3 and the fall prevention material 4 protrude from the surface of the main body 21, and the portions other than the locking portions 31 and 41 are either embedded in the main body 21 or exposed on the surface of the main body 21, although the portions other than the locking portions 31 and 41 may also protrude from the surface of the main body 21.

[0047] When the spring material 3 has the shape shown in Figure 1, when the plug material 2 is inserted into the steam vent hole 71, the locking portion 31 of the spring material 3 comes into contact with the inner circumferential surface of the steam vent hole 71, causing the intermediate portion 34 to elastically deform toward the axial side of the main body portion 21. Anticipating this deformation, a notch 25 may be formed on the side of the main body portion 21, as shown in Figure 2-(a), to match the shape of the intermediate portion 34 that is deforming toward the axial side. If the surface portion of the main body portion 21 can easily deform toward the axial side in response to the deformation of the intermediate portion 34 of the spring material 3, it is not necessarily required to form a notch 25.

[0048] Figure 2 shows an example of the manufacturing of a blocking material 1 when a fall prevention material 4 with a different shape from the fall prevention material 4 shown in Figure 1 is embedded in the main body 21. In this example, the fall prevention material 4 has two parts, as shown in Figure 2-(b): a fixing part 42 that is embedded inside the main body 21 on a flat surface and has an I-shaped cross section (rod-shaped), and a penetrating part 43 that is integrated with the end of the fixing part 42 on the knob side 22, penetrates the main body 21 in a direction perpendicular to the axis, and has a peripheral part that functions as a locking part 41. The overall shape of the fall prevention material 4 is not limited as long as it has a shape that includes a fixing part 42 and a locking part 41 that are embedded inside the main body 21. Figure 2 shows an example when the penetrating part 43 is plate-shaped.

[0049] When the plug material 2 is inserted into the steam vent hole 71, the outer surface of the main body 21 basically contacts or adheres tightly to the inner surface of the steam vent hole 71, thereby closing the steam vent hole 71. However, since the plug material 2 only needs to substantially prevent leakage of concrete 8 after it has been filled into the steel pipe 7, it is not necessarily required that the entire circumference of the outer surface contact the inner surface of the steam vent hole 71.

[0050] However, in order to enhance the effect of preventing leakage of concrete 8 or slurry when the plug material 2 is inserted into the steam vent hole 71, it is appropriate for the entire circumference of the outer surface of the main body 21 to be in contact with the inner surface of the steam vent hole 71. In that case, the main body 21 is inserted into the steam vent hole 71 while its surface layer is scraped away, or it receives a compressive force from the inner surface of the steam vent hole 71 in a direction perpendicular to the axial direction, causing it to contract in that direction, and the restoring force when it undergoes elastic deformation maintains its close contact with the inner surface of the steam vent hole 71.

[0051] On the other hand, if the entire axial length of the main body 21 is in close contact with the inner circumferential surface of the steam vent hole 71, the resistance to inserting the plug material 2 (main body 21) into the steam vent hole 71 becomes too great, which tends to reduce the ease of insertion and makes it easy for any part of the main body 21 in the axial direction to break.

[0052] Therefore, as shown in Figure 2, the tip portion 23 of the main body portion 21 of the plug material 2 on the inner circumferential surface 5a side of the steel pipe 5 is made thinner than the other parts in the axial direction, and the intermediate portion 24 on the outer circumferential surface 5b side of the steel pipe 5 is formed to be thicker than the tip portion 23. Claim 2 ), while ensuring ease of insertion into the steam vent hole 71, it is possible to ensure the effect of preventing leakage of concrete 8 or slurry.

[0053] In the example shown in Figure 2, the resistance when inserting the plug material 2 into the steam vent hole 71 is reduced, thus decreasing the possibility of breaking the main body 21 when inserting the plug material 2. At the same time, since the outer surface of the intermediate portion 24 is in close contact with the inner surface of the steam vent hole 71, an effect of preventing leakage of concrete 8, etc., can also be expected. In the manufacturing examples shown in Figures 1 and 3, the tip portion 23 of the main body 21 is made thinner than the other parts in the axial direction, and the intermediate portion 24 on the outer surface 5b side of the steel pipe 5 is formed to be thicker than the tip portion 23.

[0054] Figure 3 shows an example of the manufacturing of a plug 2 (blocking material 1) when a spring material 3 and a fall prevention material 4 are embedded within the main body 21 of the plug 2, and a connecting material 5 that engages with both the spring material 3 and the fall prevention material 4 is placed across them. 。 The connecting member 5 straddles the space between the spring material 3 and the fall prevention member 4 inside the main body 21. Therefore, together with the fall prevention member 4, it is placed inside the main body 21, which is filled into the mold in a fluid state during the molding of the main body 21, and remains embedded within the main body 21 as the main body 21 solidifies.

[0055] The connecting member 5 is located inside the main body 21 and engages with both the spring member 3 and the fall prevention member 4. As shown in Figure 3, it has locking portions 51 and 52 that can lock with or engage with the fixing portion 33 of the spring member 3 and the fixing portion 42 of the fall prevention member 4, respectively, and a connecting portion 53 located between the two locking portions 51 and 52.

[0056] The locking parts 51 and 52 serve to prevent the spring material 3 side of the main body 21 from separating from the fall prevention material 4 side in the event that the main body 21 separates axially into the spring material 3 side and the fall prevention material 4 side. Therefore, the connecting part 53 only needs to be positioned between one side of the locking parts 51 and 52. However, in order to ensure safety against the falling of the spring material 3 side, it is appropriate for the connecting parts 53, 53 to be formed in a ring shape so that they are parallel between the locking parts 51 and 52, as shown in Figure 3-(b).

[0057] When the fluid material (raw material) for the support part 21 is injected into the mold, the spring material 3 and the fall prevention material 4 are constrained or held (fixed) by the mold. In this state, if the closure material 1 is in the upright position shown in Figure 3 during manufacturing, the locking portion 51 of the connecting material 5 is supported by the fixing portion 33 of the spring material 3 located above it, and the locking portion 52 is in a state where there is a gap (play) between it and the fixing portion 42 of the fall prevention material 4, or in a state where it is in contact with it.

[0058] It is not necessary whether the locking portion 51 of the connecting member 5 is in contact with the anchoring portion 33 of the spring member 3, or whether the locking portion 52 is in contact with the anchoring portion 42 of the fall prevention member 4. Even if the knob portion 22, which is the part of the sealing member 1 on the outer surface 7b side of the steel pipe, melts or breaks due to the effects of heat and separates from the main body portion 21 before the concrete 8 is filled into the steel pipe 7, it is sufficient that the main body portion 21 is prevented from falling into the steel pipe 7.

[0059] Figure 4-(b) shows the situation when the occluding material 1 shown in Figure 1-(a), in which the spring material 3 is integrally attached to the plug material 2, is inserted into the steam vent hole 71 from the outer surface 7b side of the steel pipe. At this time, the tip 32 of the locking portion 31 of the spring material 3 comes into contact with the inner surface of the steam vent hole 71, and as the locking portion 31 is pushed toward the center (axis) side of the main body portion 21 of the plug material 2, the locking portion 31 and the intermediate portion 34 of the spring material 3, and the portion of the tip portion 23 of the main body portion 21 on the inner surface 7a side are curved toward the center side of the main body portion 21.

[0060] Figure 4-(a) shows the situation when the sealing material 1 is fully inserted into the steam vent hole 71 from the state shown in (b). At this time, the locking portion 31 of the spring material 3 passes through the steam vent hole 71, and the locking portion 31 and the intermediate portion 34 are restored by a restoring force that moves from the center of the main body portion 21 toward the outer circumference. Simultaneously, the tip 32 of the locking portion 31 locks into the inner circumferential surface 7a of the steel pipe 7, thereby preventing the sealing material 1 from coming out toward the outer circumferential surface 7b of the steel pipe 7. [Explanation of Symbols]

[0061] 1...Occluder, 2... Plug material, 21... Main body, 22... Knob, 23... Tip, 24... Middle section, 25... Notch, 3...spring material, 31...locking part, 32...tip, 33...fixing part, 34...middle part, 4... Fall prevention material, 41... Locking part, 42... Fixing part, 43... Penetration part, 5... Connecting material, 51... Locking part, 52... Locking part, 53... Connecting part, 6...Steel pipe concrete column, 7...steel pipe, 7a...inner surface, 7b...outer surface, 71...steam vent hole, 8... Concrete.

Claims

1. A sealing material is inserted from the outer surface side of the steel pipe into a steam vent hole formed by penetrating between the inner and outer surfaces of a steel pipe constituting a steel pipe concrete column, and seals the steam vent hole from the inner surface side of the steel pipe until the concrete filling into the steel pipe is complete and the concrete loses its fluidity. A plug having a melting point that allows it to melt in the event of a fire, a cross-sectional area that can be inscribed within the steam vent hole, and a length that exceeds the total length of the steam vent hole, and positioned within the steam vent hole; and a plug having a knob that is continuous with the main body and located on the outer surface side of the steel pipe, The plug material is fitted to the main body and has a spring material having a locking portion that engages with the inner circumferential surface of the steel pipe toward the outer circumferential surface when the main body is inserted into the steam vent hole, A fall prevention material is attached to the knob side of the main body of the stopper material, having a locking portion that engages with the outer surface of the steel pipe toward the inner surface when the main body is inserted into the steam vent hole. A sealing material for a steam vent hole in a concrete steel pipe column, characterized in that a connecting member is positioned between the spring material and the fall prevention material, and the connecting member engages with both the spring material and the fall prevention material.

2. The plugging material for steam vent holes in a concrete steel pipe column according to claim 1, characterized in that the tip of the main body of the plugging material on the inner circumferential surface side of the steel pipe is thinner than the other parts in the axial direction, and the intermediate part from the tip on the outer circumferential surface side of the steel pipe is thicker than the tip.

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