Tool for removing air bubbles

Abstract

To provide a tool for removing air bubbles accumulated on the lower surfaces of steel frames passing through poured concrete, which can improve work efficiency in air bubble removal.SOLUTION: A tool 21 for removing air bubbles comprises an insertion plate 22 that can be inserted into poured concrete, and an operating rod 23 connected to the insertion plate 22, and is used to remove air bubbles that have accumulated on the lower surface of a flange 12b at a beam 12 passing through the concrete. The insertion plate 22 is formed in a long plate shape. The position relationship between the insertion plate 22 and the operating rod 23 is set such that when the operating rod 23 is positioned to extend vertically, the longitudinal direction and the thickness direction of the insertion plate 22 are arranged horizontally.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an air bubble scraping tool. [Background technology]

[0002] For example, when constructing a building using reinforced concrete columns and steel beams (RCS construction), when concrete is poured into the joints between the columns and beams, the steel frame that forms the beam passes through the poured concrete. After the concrete is poured, the air contained in the concrete rises to the surface, causing air bubbles to accumulate on the underside of the steel frame. An example of a place where air bubbles can accumulate is the underside of a flange that protrudes from the web of the steel frame and extends in the longitudinal direction of the steel frame.

[0003] As a tool for removing air bubbles accumulated on the underside of the steel frame after the concrete has been poured, for example, the air bubble remover shown in Patent Document 1 is known. This air bubble remover includes a control rod and an insertion part. The insertion part of the air bubble remover is inserted into the poured concrete. In this state, the control rod is held and the insertion part is brought into contact with the underside of the steel frame. Furthermore, the control rod is moved to move the insertion part along the underside of the steel frame, thereby scraping out the air bubbles accumulated on the underside of the steel frame to the outside of the underside. This removes the air bubbles accumulated on the underside of the steel frame. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-158952 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the air bubble remover in Patent Document 1 has a relatively large insertion part. This causes a large resistance when inserting the insertion part into poured concrete. As a result, it becomes difficult to insert the insertion part into the concrete. This reduces the work efficiency when using the air bubble remover to scrape out air bubbles accumulated on the underside of the steel frame. [Means for solving the problem]

[0006] Next, various embodiments of the air bubble removal tool that solves the above problems will be described. (Aspect 1) This air bubble scraping tool comprises an insertion plate that can be inserted into poured concrete and an operating rod connected to the insertion plate, and is used to scrape out air bubbles that have accumulated on the underside of a steel frame as it passes through the concrete.The insertion plate is formed in a long plate shape, and the positional relationship between the operating rod and the insertion plate is such that when the operating rod is positioned to extend vertically, the longitudinal direction and thickness direction of the insertion plate are horizontal.

[0007] According to the above configuration, the insertion plate is inserted into the poured concrete. Then, by holding the operating rod and moving the insertion plate along the underside of the steel frame, air bubbles accumulated on the underside of the steel frame are scraped out of the underside of the steel frame by the insertion plate. The insertion of the insertion plate into the concrete is performed with the operating rod arranged to extend vertically. When the operating rod is arranged to extend vertically, the longitudinal direction and thickness direction of the insertion plate are horizontal. Therefore, by inserting the insertion plate in the above-mentioned state into the poured concrete, the resistance during the insertion can be kept small. This makes it easier to insert the insertion plate into the concrete, improving the work efficiency when scraping out air bubbles accumulated on the underside of the steel frame with an air bubble remover.

[0008] (Aspect 2) The underside of the steel frame is the underside of a flange formed on the steel frame to extend along its longitudinal direction, and a guide member is fixed to the insertion plate which protrudes above the insertion plate when the insertion plate is inserted under the flange with the operating rod positioned to extend vertically, and the guide member is formed with a guide surface which is capable of making surface contact with the end face of the flange in the protruding direction over a predetermined length along the longitudinal direction of the steel frame, and the guide surface is inclined with respect to the longitudinal direction of the insertion plate (Aspect 1).

[0009] According to the above configuration, after the insertion plate is inserted into the poured concrete, the upper edge of the insertion plate is abutted against the lower surface of the flange of the steel frame, and the guide surface of the guide member is abutted against the end surface of the flange in the protruding direction. In this state, the air bubble scraping tool is moved in the longitudinal direction of the steel frame so that the tip of the insertion plate in the protruding direction relative to the operating rod is forward. This movement of the air bubble scraping tool is performed while the guide surface of the guide member is in contact with the end surface of the flange in the protruding direction. This makes it possible to guide the movement of the air bubble scraping tool and maintain the position of the insertion plate relative to the flange during the movement. Then, with the movement of the air bubble scraping tool, air bubbles accumulated on the lower surface of the flange of the steel frame are efficiently pushed out of the lower surface by the insertion plate. This makes it possible to efficiently remove air bubbles from the lower surface of the steel frame.

[0010] (Aspect 3) The air bubble scraping tool according to embodiment 2, wherein the guide member is capable of being displaced in its longitudinal direction relative to the insertion plate and is capable of being fixed to the insertion plate at the displaced position.

[0011] According to the above configuration, by displacing the guide member in the longitudinal direction relative to the insertion plate and fixing it in the position after the displacement, the distance from the guide surface to the tip of the insertion plate can be adjusted to a value corresponding to the amount of protrusion of the flange from the web of the steel frame. This allows the insertion plate to scrape out air bubbles that have accumulated on the underside of the flange of the steel frame without leaving any behind on the underside.

[0012] (Aspect 4) The air bubble scraping tool according to any one of (Mode 1) to (Mode 3), wherein the operating rod is provided with a grip portion protruding from the operating rod in a direction intersecting with the axis of the operating rod.

[0013] According to the above configuration, when the air bubble scraper is moved in the longitudinal direction of the steel frame after the insertion plate is inserted into the poured concrete, the movement can be easily performed by holding the grip of the control rod. Also, when the control rod is rotated around its axis to change the moving direction of the insertion plate, the operation for that purpose can be easily performed by holding the grip of the control rod.

[0014] (Aspect 5) An air bubble scraping tool described in any one of (embodiment 1) to (embodiment 4), in which an elastic body is provided on the insertion plate, the elastic body protruding upward from the upper edge of the insertion plate when the operating rod is positioned to extend vertically and extending in the longitudinal direction of the insertion plate.

[0015] According to the above-mentioned configuration, after the insertion plate is inserted into the poured concrete, the elastic body protruding upward from the upper edge of the insertion plate is pressed against the underside of the steel frame. In this state, by moving the air bubble scraping tool in the longitudinal direction of the steel frame, the air bubbles accumulated on the underside of the steel frame can be efficiently scraped out of the underside. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 is a perspective view showing a column-beam joint in a building. [Diagram 2] FIG. 2 is a side view showing the air bubble scraping tool. [Diagram 3] FIG. 3 is a plan view showing the scraping tool of FIG. 2. [Figure 4] FIG. 2 is a plan view showing the column-beam joint of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, one embodiment of the air bubble scraping tool will be described with reference to Figs. 1 to 4. As shown in Figure 1, a building constructed using the RC column and S beam construction method (RCS construction method) has reinforced concrete columns 11 and steel beams 12. The steel frame that forms the beam 12 has plate-shaped webs 12a that stand upright in the vertical direction, and flanges 12b that protrude horizontally from both the top and bottom ends of the webs 12a. The flanges 12b extend in the longitudinal direction of the steel frame.

[0018] Such a building has a column-beam joint 13. The column-beam joint 13 is a location in the building where beams 12 intersect with each other and where the beams 12 intersect with the column 11. Between the intersecting beams 12 at the column-beam joint 13, closing plates 15 bent into an L shape are disposed at positions corresponding to the outer surfaces of the columns 11. The closing plates 15 are joined to the webs 12a and flanges 12b of the beams 12.

[0019] In the RC column / S beam construction method for buildings, after forming a reinforced concrete column 11, an intersection of beams 12 is placed at the top end of the column 11. Furthermore, in the portion surrounded by a closing plate 15 at the intersection of the beams 12 (column-beam joint 13), reinforcing bars 16 for forming a column 11 above the column-beam joint 13 are passed through and concrete is poured. After that, a column 11 above the column-beam joint 13 is formed above the column-beam joint 13.

[0020] In the RC column / S beam construction method for buildings, the columns 11 and beams 12 are formed in stages toward the upper section in this way. In the column-beam joint 13 of a building built using the RC column / S beam construction method, the closing plate 15 provides shear resistance and also restrains the concrete in the column-beam joint 13.

[0021] When concrete is poured into the portion surrounded by the closing plate 15 in the beam-column joint 13, the steel frame forming the beam 12 passes through the poured concrete. After the concrete is poured, the air contained in the concrete rises to the surface, causing air bubbles to accumulate on the lower surface of the steel frame forming the beam 12. An example of a location where air bubbles accumulate is the lower surface of the upper flange 12b of the steel frame forming the beam 12.

[0022] <Detailed structure of the bubble scraping tool> 2 and 3 show an air bubble scraping tool 21 for scraping out and removing the air bubbles accumulated on the underside of the flange 12b of the beam 12 from the underside. The air bubble scraping tool 21 will be described in detail below.

[0023] The air bubble scraping tool 21 includes an insertion plate 22 that can be inserted into the poured concrete, and an operating rod 23 connected to the insertion plate 22. The insertion plate 22 is formed in a long plate shape, and is connected to the operating rod 23 at a position closer to the end than the center in the longitudinal direction, more specifically, at a position farthest from the center in the longitudinal direction. The operating rod 23 includes a gripping portion 23a that protrudes from the operating rod 23 in a direction intersecting with the axis of the operating rod 23.

[0024] The positional relationship between the operation rod 23 and the insertion plate 22 is such that when the operation rod 23 is arranged to extend vertically, the longitudinal direction and thickness direction of the insertion plate 22 are horizontal. As described above, when the operation rod 23 is arranged to extend vertically, the arrangement of the operation rod 23 does not necessarily have to be parallel to the direction in which gravity acts, and it may be arranged to be slightly inclined with respect to the direction in which gravity acts.

[0025] The insertion plate 22 of the air bubble scraping tool 21, with the operating rod 23 arranged to extend vertically, is inserted into the concrete below the flange 12b of the beam 12. A slope 24 is formed on the longitudinal end of the insertion plate 22, the end opposite the end to which the operating rod 23 is connected. By forming the slope 24 in this manner, the shape of the end of the insertion plate 22 opposite the end to which the operating rod 23 is connected corresponds to the shape of the boundary between the web 12a and the flange 12b of the beam 12.

[0026] The insertion plate 22 is provided with an elastic body 25. The elastic body 25 is fixed to the insertion plate 22 by a bolt 26 and a nut 27. When the operation rod 23 is arranged to extend vertically, the elastic body 25 protrudes upward from the upper edge of the insertion plate 22 and extends in the longitudinal direction of the insertion plate 22. The elastic body 25 may be made of a material softer than metal, such as rubber, sponge, or resin, or a brush body such as a brush.

[0027] A guide member 28 is fixed by a bolt 29 and a nut 30 between the portion of the insertion plate 22 where the elastic body 25 is fixed and the portion where the operation rod 23 is connected. The guide member 28 protrudes above the upper edge of the insertion plate 22 when the insertion plate 22 is inserted below the flange 12b with the operation rod 23 arranged to extend vertically.

[0028] A guide surface 31 is formed on the guide member 28. The guide surface 31 can come into surface contact with the end face of the flange 12b in the direction protruding from the web 12a over a length determined along the longitudinal direction of the beam 12. The guide surface 31 is inclined with respect to the longitudinal direction of the insertion plate 22. The inclination angle of the guide surface 31 with respect to the longitudinal direction of the insertion plate 22 may be, for example, 45°.

[0029] The guide member 28 can be displaced in the longitudinal direction relative to the insertion plate 22, and can be fixed to the insertion plate 22 at the displaced position. More specifically, a slit 32 extending in the longitudinal direction of the insertion plate 22 is formed in the insertion plate 22. The bolt 29 for fixing the guide member 28 to the insertion plate 22 passes through the slit 32.

[0030] Therefore, by releasing the fastening of the bolts 29 and nuts 30 for fixing the guide member 28 to the insertion plate 22, it becomes possible to displace the guide member 28 along the slits 32. Then, after the guide member 28 has been displaced along the slits 32, the guide member 28 is fixed to the insertion plate 22 by fastening the bolts 29 and nuts 30.

[0031] Next, the function of the air bubble scraping tool 21 will be described. When concrete is poured into the part of the building's beam-column joint 13 surrounded by the closing plate 15, the beam 12 passes through the concrete. Then, with the operating rod 23 of the air bubble scraping tool 21 arranged to extend vertically, the insertion plate 22 of the air bubble scraping tool 21 is inserted into the concrete. At this time, the longitudinal direction and thickness direction of the insertion plate 22 are horizontal, so that the resistance when inserting the insertion plate 22 into the concrete is kept small.

[0032] The insertion plate 22 inserted into the concrete is placed below the flange 12b of the beam 12. Then, the upper edge of the insertion plate 22, in other words, the elastic body 25 fixed to the insertion plate 22, is pressed against the lower surface of the flange 12b. Furthermore, the guide surface 31 of the guide member 28 is abutted against the end surface of the flange 12b in the protruding direction. The fixed position of the guide member 28 in the longitudinal direction of the insertion plate 22 is adjusted in advance so that the distance from the guide surface 31 to the end of the insertion plate 22 opposite to the end to which the operation rod 23 is connected corresponds to the amount of protrusion of the flange 12b from the web 12a.

[0033] With the elastic body 25 pressed against the lower surface of the flange 12b and with the guide surface 31 of the guide member 28 abutting against the end surface of the flange 12b in the protruding direction, the air bubble scraping tool 21 is moved in the longitudinal direction of the beam 12 so that the tip of the insertion plate 22 in the protruding direction relative to the operating rod 23 is forward. This movement of the air bubble scraping tool 21 is performed as shown by the arrow in Fig. 4 while the guide surface 31 of the guide member 28 is in contact with the end surface of the flange 12b in the protruding direction. When moving the air bubble scraping tool 21 in the longitudinal direction of the beam 12 or rotating the operating rod 23 around its axis to change the moving direction of the insertion plate 22, such operations can be easily performed by holding the grip portion 23a of the operating rod 23.

[0034] As the air bubble scraping tool 21 moves as described above, the air bubbles accumulated on the underside of the flange 12b of the beam 12, i.e., the air bubbles 33 shown in Fig. 3, are efficiently pushed out of the underside as indicated by the arrow by the insertion plate 22. As a result, the air bubbles 33 accumulated on the underside of the flange 12b are scraped out of the underside of the flange 12b by the insertion plate 22, so that the air bubbles 33 can be efficiently removed from the underside of the flange 12b of the beam 12.

[0035] According to the present embodiment described above in detail, the following effects can be obtained. (1) The insertion plate 22 is inserted into the concrete poured into the column-beam joint 13 with the operating rod 23 arranged to extend vertically. When the operating rod 23 is arranged to extend vertically, the longitudinal direction and thickness direction of the insertion plate 22 are horizontal. Therefore, by inserting the insertion plate 22 in the above-mentioned state into the poured concrete, the resistance during the insertion can be kept small. This makes it easier to insert the insertion plate 22 into the concrete, improving the work efficiency when scraping out air bubbles accumulated on the underside of the flange 12b of the beam 12 with an air bubble remover.

[0036] (2) After the insertion plate 22 is inserted into the concrete poured in the column-beam joint 13, the upper edge of the insertion plate 22, in other words, the elastic body 25 fixed to the insertion plate 22, is pressed against the lower surface of the flange 12b, and is brought into contact with the lower surface. Furthermore, the guide surface 31 of the guide member 28 is brought into contact with the end surface of the flange 12b of the beam 12 in the protruding direction from the web 12a. In this state, the air bubble scraping tool 21 is moved in the longitudinal direction of the beam 12 so that the tip of the insertion plate 22 in the protruding direction relative to the operating rod 23 is forward. The above movement of the air bubble scraping tool 21 is performed while the guide surface 31 of the guide member 28 is in contact with the end surface of the flange 12b in the protruding direction. This guides the above movement of the air bubble scraping tool 21, and maintains the posture of the insertion plate 22 relative to the flange 12b during the movement. As the air bubble scraping tool 21 moves as described above, the air bubbles 33 accumulated on the lower surface of the flange 12b of the beam 12 are efficiently pushed out of the lower surface by the insertion plate 22. This makes it possible to efficiently remove the air bubbles 33 from the lower surface of the flange 12b.

[0037] (3) In the air bubble scraping tool 21, the guide member 28 can be displaced in the longitudinal direction relative to the insertion plate 22 and fixed in the position after the displacement. Therefore, in the air bubble scraping tool 21, the distance from the guide surface 31 to the tip of the insertion plate 22 can be adjusted to a value corresponding to the amount of protrusion of the flange 12b from the web 12a of the beam 12. As a result, the air bubbles 33 accumulated on the lower surface of the flange 12b of the beam 12 can be scraped out of the lower surface by the insertion plate 22 without being left behind on the lower surface.

[0038] (4) When moving the air bubble scraping tool 21 in the longitudinal direction of the beam 12 after inserting the insertion plate 22 into the poured concrete, the movement can be easily performed by holding the grip portion 23a of the operating rod 23. In addition, when rotating the operating rod 23 around its axis to change the moving direction of the insertion plate 22, the operation for that purpose can be easily performed by holding the grip portion 23a of the operating rod 23.

[0039] The above embodiment can be modified, for example, as follows: The above embodiment and the following modified examples can be combined with each other to the extent that no technical contradiction occurs. The location where the air bubble scraping tool 21 is used may be a location other than the concrete poured at the column-beam joint 13. For example, when concrete is poured at a location other than the column-beam joint 13 and a steel frame passes through the concrete, the air bubble scraping tool 21 may be used to scrape out air bubbles from the underside of the steel frame.

[0040] The elastic body 25 does not necessarily have to be fixed to the insertion plate 22 by the bolts 26 and nuts 27, and may be fixed to the insertion plate 22 by adhesion with an adhesive or the like instead of by the bolts 26 and nuts 27.

[0041] The elastic body 25 does not necessarily have to be provided. The grip portion 23a does not necessarily have to be provided. The inclination angle of the guide surface 31 with respect to the longitudinal direction of the insertion plate 22 may be an angle other than 45°.

[0042] The guide member 28 does not necessarily have to be displaceable in the longitudinal direction of the insertion plate 22 . The guide member 28 may be omitted. [Explanation of symbols]

[0043] 11. Pillar 12...beam 12a…Web 12b...Flange 13…Column beam joint 15…Blocking plate 16…Reinforced concrete 21...Air bubble scraping tool 22…Insertion plate 23...Operation rod 23a...gripping part 24...Slope 25...Elastic body 26…Bolt 27...Nut 28...Guide member 29…Bolt 30…Nut 31...Guide surface 32...Slit 33...Air bubble

Claims

1. An air bubble scraping tool for scraping out air bubbles accumulated on the underside of a steel frame passing through the concrete, the tool comprising an insertion plate that can be inserted into poured concrete and an operating rod connected to the insertion plate, the air bubble scraping tool comprising: The insertion plate is formed in a long plate shape, The positional relationship between the operating rod and the insertion plate is such that when the operating rod is positioned to extend vertically, the longitudinal direction and thickness direction of the insertion plate are horizontal.

2. The lower surface of the steel frame is a lower surface of a flange formed on the steel frame so as to extend along the longitudinal direction thereof, A guide member is fixed to the insertion plate, the guide member protruding above the insertion plate when the insertion plate is inserted under the flange with the operation rod disposed so as to extend vertically, The guide member is formed with a guide surface that can come into surface contact with the end face of the flange in the protruding direction over a predetermined length along the longitudinal direction of the steel frame, The air bubble scraping tool according to claim 1 , wherein the guide surface is inclined with respect to the longitudinal direction of the insertion plate.

3. 3. The air bubble scraping tool according to claim 2, wherein the guide member is capable of being displaced in its longitudinal direction relative to the insertion plate and is capable of being fixed to the insertion plate at the displaced position.

4. 4. The air bubble scraping tool according to claim 1, wherein the control rod is provided with a grip portion protruding from the control rod in a direction intersecting with an axis of the control rod.

5. The insertion plate is provided with an elastic body, A bubble scraping tool as described in any one of claims 1 to 3, wherein the elastic body protrudes upward from the upper edge of the insertion plate when the operating rod is positioned to extend vertically and extends in the longitudinal direction of the insertion plate.

Images