Concrete pouring and piping

Abstract

To provide concrete placing piping which can suppress separation of a concrete material even if a giant structure is constructed.SOLUTION: In concrete placing piping 10, a pipe body 12 has a first lift part 12A, and a second lift part 12B which is a region with a second height H2 from a first height H1. There are performed first placing of discharging concrete C from a hole 15 formed in the first lift part 12A, and placing the concrete C up to the first height H1, and second placing of discharging concrete from a hole 15 formed in the second lift part 12B over days from the first placing, and placing the concrete up to the second height H2. A distance X1 between a hole 15 positioned at the bottom of the second lift part 12B in the plurality of holes 15 and a first boundary part Z1 is longer than a distance between a hole 15 positioned at the top of the first lift part 12A and the first boundary part Z1.SELECTED DRAWING: Figure 9

Description

Technical Field

[0001] The present disclosure relates to a concrete placing pipe through which placed concrete passes.

Background Art

[0002] Patent Document 1 describes a concrete placing method for constructing a side wall by placing concrete through distribution pipes arranged in a placing space. In the construction of the side wall, a plurality of formworks are installed, and concrete is placed into the placing space defined by the plurality of formworks through the distribution pipes. Reinforcing bars are installed in the placing space, and high-fluidity concrete is placed.

[0003] The distribution pipes have a plurality of through holes formed in the pipe wall portion. A plurality of distribution pipes are inserted and installed into the placing space through the spaces between the reinforcing bars from above the formwork. High-fluidity concrete is injected into each distribution pipe from a hopper provided at the upper end, and the high-fluidity concrete injected into each distribution pipe is supplied into the placing space through the through holes. The height from the lower end of the distribution pipe to the lower end of the lowest through hole is set to be 100 mm or more.

[0004] Three distribution pipes are installed in the formwork, and high-fluidity concrete is injected into the placing space through each of the three distribution pipes. When the height of the high-fluidity concrete in the placing space reaches a predetermined rising height, the first layer of the high-fluidity concrete layer is formed. Then, high-fluidity concrete is injected again through each distribution pipe, and when the height of the high-fluidity concrete reaches a predetermined rising height higher than the first layer, the second layer of the high-fluidity concrete is formed.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

[0006] Incidentally, when constructing massive structures, the pouring of concrete into the pouring space may not be completed in a single day. Also, when constructing massive structures, the concrete pouring pipes may be long. If such concrete pouring pipes are arranged to extend vertically and concrete is poured into them, material segregation may occur as the concrete falls vertically. In other words, there is a concern that material segregation will occur when the concrete moves vertically downward due to free fall inside the concrete pouring pipe.

[0007] The purpose of this disclosure is to provide concrete pouring piping that can suppress material segregation of concrete even when constructing massive structures. [Means for solving the problem]

[0008] The concrete pouring pipe according to this disclosure comprises (1) a pipe body arranged to extend vertically, into which concrete is injected through an opening formed at the upper end. The pipe body has a plurality of holes arranged along its longitudinal direction. The pipe body has a first lift section, which is the region from the lower end of the pipe body to a first height, and a second lift section, which is the region from the first height to a second height higher than the first height. A first pour is performed in which concrete is discharged from the holes formed in the first lift section of the pipe body to pour concrete up to the first height, and a second pour is performed after the first pour, in which concrete is discharged from the holes formed in the second lift section of the pipe body to pour concrete up to the second height. The distance from the hole located at the bottom of the second lift section to the first boundary between the first lift section and the second lift section is longer than the distance from the hole located at the top of the first lift section to the first boundary.

[0009] This concrete pouring pipe comprises a pipe body into which concrete is injected, and the pipe body has multiple holes formed therein for the discharge of concrete. The pipe body has at least a first lift section and a second lift section. The first lift section is the region of the pipe body from the lower end to a first height, and the second lift section is the region of the pipe body from the first height to a second height. Using this concrete pouring pipe, a first pour is performed in which concrete is poured from the holes formed in the first lift section up to a first height, and a second pour is performed after the first pour, in which concrete is poured from the holes formed in the second lift section up to a second height. The distance from the lowest hole in the second lift section to the first boundary between the first and second lift sections is longer than the distance from the highest hole in the first lift section to the first boundary. Therefore, when the second concrete pour is performed on a different day than the first, the distance from the lowest hole in the second lift section to the first boundary is longer than the distance from the highest hole in the first lift section to the first boundary, thus increasing the length from the lowest hole in the second lift section to the first boundary. As a result, when the second concrete pour is performed on a different day than the first, the concrete that has fallen into the section of the pipe body from the first boundary to the lowest hole in the second lift section can be accumulated. After accumulating the concrete in this section, the concrete can be discharged to the outside of the pipe body through the hole in the second lift section, thereby suppressing material segregation of the concrete discharged into the concrete pouring space.

[0010] (2) In (1) above, the pipe body may further have a third lift section, which is a region from the second height to a third height higher than the second height. A third pour may be performed after the second pour, in which concrete is discharged from a hole formed in the third lift section of the pipe body to pour concrete up to the third height. The distance from the lowest hole of the third lift among the multiple holes to the second boundary between the second lift section and the third lift section may be longer than the distance from the highest hole of the second lift section among the multiple holes to the second boundary. In this case, since the distance from the lowest hole of the third lift section to the second boundary is longer than the distance from the highest hole of the second lift section to the second boundary, the length from the lowest hole of the third lift section to the second boundary can be increased. Therefore, when the third pour is performed, concrete that has fallen into the part of the pipe body from the second boundary to the lowest hole of the third lift section can be accumulated. Therefore, by discharging the accumulated concrete to the outside of the pipe body, material segregation of the concrete discharged into the concrete pouring space can be suppressed, even if it spans multiple days.

[0011] (3) In (1) or (2) above, the pipe body may have a storage section that protrudes from around the hole to the outside of the pipe body in a plan view and stores the concrete that has passed through the hole. The storage section may have a leak outlet from which the stored concrete leaks out. In this case, the concrete that comes out of the hole is temporarily stored in the storage section and then leaks out into the concrete pouring space from the leak outlet of the storage section. By temporarily storing the concrete in the storage section before it goes into the concrete pouring space in this way, material segregation of the concrete discharged into the concrete pouring space can be suppressed more reliably.

[0012] (4) In (3) above, the leak outlet may be formed at a position higher than the upper edge of the hole. In this case, by positioning the leak outlet higher than the upper edge of the hole, the time that concrete is stored in the storage area can be extended. Therefore, material segregation of concrete leaking from the leak outlet into the concrete pouring space can be suppressed even more reliably.

[0013] (5) In any of (1) to (4) above, the concrete pouring pipe may be equipped with a sliding member on which the concrete inside the pipe body rests, and which slides along the inner surface of the pipe body as the concrete flows down inside the pipe body. In this case, the concrete accumulates on the sliding member as it falls, and the sliding member gradually slides downward as a result. At this time, the concrete accumulated on the sliding member moves slowly downward together with the sliding member. By accumulating concrete on the sliding member in this way, material segregation of the concrete can be suppressed more reliably.

[0014] (6) In any of (1) to (5) above, the concrete pouring piping may include a plurality of pipe bodies, a receiving section for receiving concrete, and a concrete distribution member having a plurality of branching sections extending from the receiving section to the openings of each of the plurality of pipe bodies. In this case, by pouring concrete into the receiving section, concrete can be injected into each of the plurality of pipe bodies via the concrete distribution member. Therefore, concrete pouring work can be carried out efficiently even when constructing a huge structure. [Effects of the Invention]

[0015] According to this disclosure, material segregation of concrete can be suppressed even when constructing massive structures. [Brief explanation of the drawing]

[0016] [Figure 1] This is a perspective view showing a hybrid floating body including an example structure constructed by concrete-cast piping according to the embodiment. [Figure 2] Figure 1 is a plan view showing the hybrid floating structure. [Figure 3] This is a cross-sectional view of a column, which is an example of the structure shown in Figure 1. [Figure 4] (a) is a cross-sectional view taken along line AA in Figure 3. (b) is a cross-sectional view taken along line BB in Figure 3. [Figure 5] This is a site plan illustrating the construction of the column shown in Figure 3. [Figure 6] It is a cross-sectional view of the site for explaining the construction of the column in FIG. 3. [Figure 7] It is a perspective view showing a concrete distribution member of a concrete placing pipe according to an embodiment. [Figure 8] It is a plan view of the concrete distribution member in FIG. 7. [Figure 9] It is a side view showing a pipe body of a concrete placing pipe according to an embodiment. [Figure 10] It is a side view showing a hole of the pipe body in FIG. 9. [Figure 11] It is a perspective view showing the lower end of the pipe body in FIG. 9. [Figure 12] It is a view showing a pipe body according to a second embodiment. [Figure 13] It is a view showing a pipe body according to a third embodiment. [Figure 14] It is a view showing a pipe body according to a fourth embodiment. [Figure 15] It is a view showing a concrete distribution member of a concrete placing pipe according to a fifth embodiment. [Figure 16] It is a cross-sectional view showing a sliding member of a concrete placing pipe according to a sixth embodiment. [Figure 17] It is a view showing a pipe body of a concrete placing pipe according to a seventh embodiment. [Figure 18] It is a cross-sectional view showing a pipe body of a concrete placing pipe according to an eighth embodiment.

Mode for Carrying Out the Invention

[0017] Hereinafter, embodiments of a concrete placing pipe according to the present disclosure will be described with reference to the drawings. In the description of the drawings, the same or corresponding elements are denoted by the same reference numerals, and redundant descriptions are omitted as appropriate. The drawings may be drawn with some parts simplified or exaggerated for ease of understanding, and dimensional ratios and the like are not limited to those shown in the drawings.

[0018] Figure 1 is a perspective view showing a hybrid floating body 1 equipped with a structure constructed by concrete-cast piping according to this embodiment. Figure 2 is a plan view of the hybrid floating body 1. For example, the hybrid floating body 1 is a foundation structure for a wind turbine. This wind turbine, for example, performs offshore wind power generation. The hybrid floating body 1 is a semi-submersible (semi-sub) floating structure.

[0019] The hybrid floating body 1 comprises a column 3 located in the center of the hybrid floating body 1 in a plan view, and a lower hull 4 extending radially from the column 3 in a plan view. The lower hull 4 has a central portion 4b on which the column 3 is provided, and three extending portions 4c extending radially from the central portion 4b. The extending portions 4c have a root portion 4d located at the end on the column 3 side and a tip portion 4f located at the end opposite to the column 3.

[0020] The tip portion 4f includes a first corner portion 4g located at one end of the extension portion 4c in the width direction, and a second corner portion 4h located at the other end of the extension portion 4c in the width direction. The length L2 of the extension portion 4c is, for example, 35m or more and 55m or less (45m as an example). The length L2 corresponds to the distance from the outer surface of the column 3 to the tip of the extension portion 4c. The distance L3 from the tip of one extension portion 4c to the tip of the other extension portion 4c is, for example, 80m or more and 100m or less (85m as an example).

[0021] Column 3 is a structure constructed by concrete-cast piping according to this embodiment. Column 3 is, for example, cylindrical. The diameter L4 of Column 3 is, for example, 10m or more and 15m or less (11m as an example). Column 3 constitutes the offshore wind power foundation of the hybrid floating body 1. Column 3 has a tower joint 3b at its upper end to which the tower of the offshore wind turbine is joined. For example, the tower joint 3b is made of steel. Figure 3 is a cross-sectional view showing Column 3.

[0022] As shown in Figure 3, the tower joint 3b includes, for example, a diaphragm 3c that is annular in plan view and a flange 3d that extends upward from the diaphragm 3c. The flange 3d extends along the circumferential direction D2 of the column 3 in plan view (see Figure 4(a), etc.).

[0023] The height L5 of column 3 is, for example, 30m or more and 40m or less. Column 3 has, for example, a steel-shell concrete structure (a composite structure of steel and concrete). In this case, column 3 comprises a cylindrical outer steel plate 5, a cylindrical inner steel plate 6 located inside the outer steel plate 5 in a plan view, and concrete C poured between the outer steel plate 5 and the inner steel plate 6. In a plan view, the outer steel plate 5 and the inner steel plate 6 form an annular shape. The diameter of the outer steel plate 5 in a plan view is, for example, 10m or more and 15m or less (11m as an example). The diameter of the inner steel plate 6 in a plan view is, for example, 8m or more and 13m or less (10m as an example).

[0024] In Column 3, a concrete pouring space S is formed between the outer steel plate 5 and the inner steel plate 6, where concrete C is poured. The outer steel plate 5 has a plurality of headed studs 5c that project from the inner surface 5b toward the inner steel plate 6. The inner steel plate 6 has a plurality of headed studs 6c that project from the outer surface 6b toward the outer steel plate 5.

[0025] Figure 4(a) is a cross-sectional view taken along line AA of Figure 3. Figure 4(b) is a cross-sectional view taken along line BB of Figure 3. As shown in Figures 3, 4(a), and 4(b), each of the multiple headed studs 5c and the multiple headed studs 6c are arranged along the longitudinal direction D1 (vertical direction) of column 3 and along the circumferential direction D2 of column 3.

[0026] Column 3 is equipped with reinforcing members 7 that reinforce the outer steel plate 5 and the inner steel plate 6. The reinforcing members 7 are, for example, reinforcing plates. The reinforcing members 7 extend from the inner surface 5b of the outer steel plate 5 to the outer surface 6b of the inner steel plate 6. Column 3 is equipped with multiple reinforcing members 7, which are arranged along the circumferential direction D2 of column 3.

[0027] In this embodiment, the column 3 has a first group of reinforcing members 7A and a second group of reinforcing members 7B, each comprising a plurality of reinforcing members 7. The first group of reinforcing members 7A is located in the upper part of the column 3. That is, the first group of reinforcing members 7A is located above the center in the longitudinal direction D1 of the column 3. The second group of reinforcing members 7B is located, for example, in the central part of the longitudinal direction D1 of the column 3. For example, the height of the lower end of the second group of reinforcing members 7B is higher than the height of the lower hull 4 described above.

[0028] Figure 5 is a plan view showing site A where column 3 is constructed. Figure 6 is a cross-sectional view showing site A. Site A is, for example, located in a dock. At site A, outer steel plates 5, inner steel plates 6, and tower joints 3b are installed on a frame G installed on the ground, and a pump truck B located at site A pours concrete C into the concrete pouring space S from above. Pump truck B has an extendable boom B1 and transport piping B2 arranged along the boom B1.

[0029] The concrete pouring piping 10 according to this embodiment includes a concrete distribution member 11 that receives concrete C, and a plurality of pipe bodies 12 that pour the concrete C distributed by the concrete distribution member 11 into the concrete pouring space S. As an example, the number of pipe bodies 12 is 8. However, the number of pipe bodies 12 is not particularly limited.

[0030] Column 3 has a stage 3f that extends horizontally above the outer steel plate 5 and the inner steel plate 6. Transport piping B2 extends from the upper end of boom B1 to a concrete distribution member 11 provided on stage 3f. Pump truck B supplies concrete C to the concrete distribution member 11 via transport piping B2, and the concrete distribution member 11 distributes the supplied concrete C to each of the multiple pipe bodies 12.

[0031] Multiple pipe bodies 12 are arranged to be aligned along the circumferential direction D2 of the column 3. The pipe bodies 12 are arranged to extend along the vertical direction. In this embodiment, the pipe bodies 12 are passed between two reinforcing members 7 aligned along the circumferential direction D2. Concrete C is poured into the pipe bodies 12 from the concrete distribution member 11. More specifically, the pipe bodies 12 have an opening 13 formed at their upper end, and concrete C is poured into the interior of the pipe bodies 12 through the opening 13.

[0032] For example, the pipe body 12 is embedded after the concrete C has been poured into the concrete pouring space S. The length of the pipe body 12 is, for example, about the same as the length of the column 3, and the pipe body 12 is inserted to near the bottom end of the concrete pouring space S, and then the concrete C is discharged from the hole 15 (see Figure 9), which will be described later. Details of the pipe body 12 will be described later.

[0033] Figure 7 is a perspective view showing the concrete distribution member 11. Figure 8 is a plan view showing the concrete distribution member 11. As shown in Figures 7 and 8, the concrete distribution member 11 has a receiving section 11b for receiving concrete C and a plurality of branch sections 11c extending from the lower part of the receiving section 11b. The receiving section 11b receives concrete C from, for example, the transport pipe B2. The receiving section 11b has, for example, a bottomed cylindrical shape.

[0034] The concrete distribution member 11 may include a vibrator 11d fixed to the receiving section 11b. Figure 7 shows an example in which the concrete distribution member 11 includes multiple vibrators 11d, but the number of vibrators 11d is not particularly limited. The vibrators 11d are attached to the outer surface of the receiving section 11b. For example, the vibrators 11d vibrate the concrete C through the receiving section 11b. In this case, air bubbles can be removed from the concrete C, improving the quality of the concrete C.

[0035] The branch section 11c is tubular in shape. The branch section 11c has an opening 11f at its upper end. Each of the multiple branch sections 11c extends from the receiving section 11b to the respective openings 13 of the multiple pipe bodies 12. The concrete C received by the receiving section 11b is accumulated in the receiving section 11b and distributed from the opening 11f through the branch section 11c to each of the multiple pipe bodies 12.

[0036] Multiple openings 11f are formed in the bottom surface 11g of the receiving section 11b. The formation of multiple openings 11f in the bottom surface 11g of the receiving section 11b allows for the even distribution of concrete C to the pipe body 12 via the branching section 11c when concrete C is placed in the receiving section 11b. Furthermore, it becomes possible to adjust the amount of concrete C distributed to each pipe body 12. For example, the height of the openings 11f is lower than the height of the bottom surface 11g. In this case, the accumulation of concrete C on the bottom surface 11g can be suppressed.

[0037] Figure 9 is a side view showing the pipe body 12. As shown in Figure 9, the pipe body 12 is positioned such that its longitudinal direction D1 coincides with the longitudinal direction of the column 3. The pipe body 12 has an opening 13 formed at the upper end of the pipe body 12 and a plurality of holes 15 arranged along the longitudinal direction D1 of the pipe body 12.

[0038] The holes 15 are for pouring concrete C, which passes through the inside of the pipe body 12, into the concrete pouring space S. That is, the concrete C that passes through the inside of the pipe body 12 flows into the concrete pouring space S through the holes 15. For example, in the pipe body 12, two holes 15 located at the same height of the pipe body 12 are formed so that they face in opposite directions (left and right in Figure 9). In this case, concrete C can be poured from the same height portion of the pipe body 12 in opposite directions.

[0039] The concrete C is poured using the concrete pouring pipe 10 in the order of the first lift F1, the second lift F2, the third lift F3, and the fourth lift F4. In this embodiment, "lift" refers to the area within the concrete pouring space S where concrete C is poured per day.

[0040] The first lift F1 is located at the lower end of column 3, and the second lift F2 is located above the first lift F1. The third lift F3 is located above the second lift F2, and the fourth lift F4 is the region from the upper end of the third lift F3 to the upper end of column 3. That is, the second height H2 of the second lift F2 is higher than the first height H1 of the first lift F1, the third height H3 of the third lift F3 is higher than the second height H2, and the fourth height H4 of the fourth lift F4 is higher than the third height H3. The fourth height H4 is, for example, the same as the height of the upper end of column 3. For example, the height of the upper end of the first reinforcing member group 7A is lower than the fourth height H4 and higher than the third height H3. The height of the upper end of the second reinforcing member group 7B is higher than the first height H1 and lower than the second height H2.

[0041] In this embodiment, since the structure constructed by the concrete pouring pipe 10 is a massive column 3 with a height of 30m or more, the pouring of concrete C needs to be carried out over several days. "Over several days" means that the pouring of concrete C cannot be completed in one day, but is carried out over multiple days.

[0042] In this embodiment, a first pour is performed in which concrete C is poured up to a first height H1; a second pour is performed in which concrete C is poured up to a second height H2 after a day has passed since the first pour; a third pour is performed in which concrete C is poured up to a third height H3 after a day has passed since the second pour; and a fourth pour is performed in which concrete C is poured up to a fourth height H4 after a day has passed since the third pour.

[0043] In other words, the first concrete pour is performed on the first lift F1, and the second concrete pour is performed on the second lift F2 on a different day. Then, the third concrete pour is performed on the third lift F3 on a different day, and the fourth concrete pour is performed on the fourth lift F4 on a different day. In this case, the second reinforcing member group 7B is embedded in concrete C during the second concrete pour, and the first reinforcing member group 7A is embedded in concrete C during the fourth concrete pour.

[0044] Furthermore, the concrete C placed at the very end of the first pour may be concrete that hardens less easily than the concrete C placed at any other time during the first pour. In this case, when the second pour is performed on a later date after the first pour, the concrete C that hardens less easily, located at the first height H1, can be used as a cushion, thereby suppressing material segregation of the concrete C during the second pour. The same applies to the concrete C placed at the very end of the second pour and the concrete C placed at the very end of the third pour.

[0045] The arrangement of the holes 15 in the pipe body 12 is in accordance with the arrangement described above for the lifts. The pipe body 12 has a first hole group 15A which consists of multiple holes 15 opening to the first lift F1, a second hole group 15B which consists of multiple holes 15 opening to the second lift F2, a third hole group 15C which consists of multiple holes 15 opening to the third lift F3, and a fourth hole group 15D which consists of multiple holes 15 opening to the fourth lift F4.

[0046] The pipe body 12 has a first lift section 12A, which is the region from the lower end of the pipe body 12 to a first height H1; a second lift section 12B, which is the region from the first height H1 to a second height H2; a third lift section 12C, which is the region from the second height H2 to a third height H3; and a fourth lift section 12D, which is the region from the third height H3 to a fourth height H4. First concrete placement is performed by discharging concrete C into the concrete placement space S from holes 15 (first hole group 15A) formed in the first lift section 12A, and second concrete placement is performed by discharging concrete C into the concrete placement space S from holes 15 (second hole group 15B) formed in the second lift section 12B. Similarly, concrete C is discharged from the holes 15 (third hole group 15C) formed in the third lift section 12C to perform the third concrete placement, and concrete C is discharged from the holes 15 (fourth hole group 15D) formed in the fourth lift section 12D to perform the fourth concrete placement.

[0047] The pipe body 12 includes, for example, a first concrete reservoir C1 located at the bottom of the first lift section 12A, a second concrete reservoir C2 located at the bottom of the second lift section 12B, a third concrete reservoir C3 located at the bottom of the third lift section 12C, and a fourth concrete reservoir C4 located at the bottom of the fourth lift section 12D. The first concrete reservoir C1 represents the area where concrete C accumulates from the lower end of the first lift section 12A to the hole 15 located at the very bottom of the first lift section 12A. The second concrete reservoir C2 represents the area where concrete C accumulates from the lower end of the second lift section 12B to the hole 15 located at the very bottom of the second lift section 12B. Similarly, the third concrete accumulation area C3 is the region from the lower end of the third lift section 12C to the hole 15 located at the very bottom of the third lift section 12C, and the fourth concrete accumulation area C4 is the region from the lower end of the fourth lift section 12D to the hole 15 located at the very bottom of the fourth lift section 12D.

[0048] For example, the spacing P (pitch) between the multiple holes 15 arranged along the longitudinal direction D1 is constant except in the first concrete accumulation section C1, the second concrete accumulation section C2, the third concrete accumulation section C3, and the fourth concrete accumulation section C4. The height of the first concrete accumulation section C1, that is, the distance X1 from the hole 15 located at the bottom of the first lift section 12A among the multiple holes 15 to the lower end of the first lift section 12A, is set to a height that suppresses material segregation in the concrete C discharged from the holes 15. In other words, during the first concrete placement, the concrete C is accumulated in the first concrete accumulation section C1 before it is discharged from the holes 15, thereby suppressing material segregation of the concrete C discharged from the holes 15.

[0049] For example, the heights of the second concrete accumulation area C2, the third concrete accumulation area C3, and the fourth concrete accumulation area C4 are the same as the distance X1 described above. The value of distance X1 is, for example, 1.0m or more and 2.0m or less. However, the value of distance X1 varies depending on the height of the structure. For example, if the height of the structure is about 20m, distance X1 is 0.5m or more and 1.0m or less, and if the height of the structure is about 10m, distance X1 is 0.25m or more and 0.5m or less. If the height of the structure is about 5m, distance X1 is 0.1m or more and 0.25m or less. In this way, the value of distance X1 can be changed as appropriate.

[0050] Figure 10 is an enlarged view of the first boundary Z1 between the first lift section 12A and the second lift section 12B. As shown in Figures 9 and 10, the distance X1 from the lowest hole 15 of the second lift section 12B to the first boundary Z1 is longer than the distance X2 from the highest hole 15 of the first lift section 12A to the first boundary Z1. Distance X2 may be, for example, 0. In this case, the height of the upper end of the highest hole 15 of the first lift section 12A coincides with the first height H1.

[0051] Similarly, the distance X1 from the lowest hole 15 of the third lift section 12C to the second boundary Z2 between the second lift section 12B and the third lift section 12C is longer than the distance from the highest hole 15 of the second lift section 12B to the second boundary Z2. Furthermore, the distance X1 from the lowest hole 15 of the fourth lift section 12D to the third boundary Z3 between the third lift section 12C and the fourth lift section 12D is longer than the distance from the highest hole 15 of the third lift section 12C to the third boundary Z3. In this embodiment, the hole 15 does not straddle the first boundary Z1. Similarly, the hole 15 does not straddle the second boundary Z2 or the third boundary Z3.

[0052] Figure 11 is an enlarged view of the lower end of the pipe body 12. As shown in Figure 11, the pipe body 12 is equipped with an impact absorber 17 that absorbs the impact of concrete C falling into the first concrete reservoir C1. The impact absorber 17 is provided on the inner surface of the pipe body 12. The impact absorber 17 includes, for example, a rod-shaped first reinforcing bar 17b with one end and the other end welded to the inner surface of the pipe body 12, and a rod-shaped second reinforcing bar 17c with one end and the other end welded to the inner surface of the pipe body 12 and intersecting the first reinforcing bar 17b.

[0053] In other words, the shock-absorbing material 17 is made of a grid of reinforcing bars. When this shock-absorbing material 17 is provided in the first concrete reservoir C1, the impact on the concrete C is absorbed in the first concrete reservoir C1, thereby suppressing material segregation of the concrete C. The shock-absorbing material 17 may also be provided in at least one of the second concrete reservoir C2, the third concrete reservoir C3, and the fourth concrete reservoir C4.

[0054] Next, the effects and benefits obtained from the concrete pouring pipe 10 according to this embodiment will be described. As shown in Figures 9 and 10, the concrete pouring pipe 10 comprises a pipe body 12 into which concrete C is injected, and the pipe body 12 has a plurality of holes 15 through which the concrete C is discharged. The pipe body 12 has at least a first lift section 12A and a second lift section 12B. The first lift section 12A is the region of the pipe body 12 from the lower end of the pipe body 12 to a first height H1, and the second lift section 12B is the region of the pipe body 12 from the first height H1 to a second height H2.

[0055] Using the concrete pouring pipe 10, a first pour is performed in which concrete C is poured from a hole 15 formed in the first lift section 12A up to a first height H1. After a day has passed since the first pour, a second pour is performed in which concrete C is poured from a hole 15 formed in the second lift section 12B up to a second height H2. The distance X1 from the lowest hole 15 in the second lift section 12B to the first boundary Z1 between the first lift section 12A and the second lift section 12B is longer than the distance X2 from the highest hole 15 in the first lift section 12A to the first boundary Z1.

[0056] Therefore, when the second concrete pour is performed on a different day than the first, the distance X1 from the lowest hole 15 of the second lift section 12B to the first boundary section Z1 is longer than the distance X2 from the highest hole 15 of the first lift section 12A to the first boundary section Z1, thus increasing the length from the lowest hole 15 of the second lift section 12B to the first boundary section Z1. As a result, when the second concrete pour is performed on a different day than the first, the concrete C that has fallen can be accumulated in the portion of the pipe body 12 from the first boundary section Z1 to the lowest hole 15 of the second lift section 12B (second concrete accumulation section C2). After accumulating the concrete C in this section, the concrete C is discharged to the outside of the pipe body 12 from the hole 15 of the second lift section 12B, thereby suppressing material segregation of the concrete C discharged into the concrete pouring space S.

[0057] In this embodiment, the pipe body 12 further has a third lift section 12C, which is a region from a second height H2 to a third height H3 that is higher than the second height H2. After a day has passed since the second pouring, a third pouring is performed in which concrete C is discharged from holes 15 formed in the third lift section 12C of the pipe body 12 to pour concrete C up to the third height H3. The distance X1 from the hole 15 located at the bottom of the third lift section 12C among the multiple holes 15 to the second boundary Z2 between the second lift section 12B and the third lift section 12C is longer than the distance from the hole 15 located at the top of the second lift section 12B among the multiple holes 15 to the second boundary Z2.

[0058] In this case, the distance X1 from the lowest hole 15 of the third lift section 12C to the second boundary section Z2 is longer than the distance from the highest hole 15 of the second lift section 12B to the second boundary section Z2, thereby increasing the length from the lowest hole 15 of the third lift section 12C to the second boundary section Z2. Therefore, when the third concrete pouring is performed, the concrete C that falls into the section of the pipe body 12 from the second boundary section Z2 to the lowest hole 15 of the third lift section 12C (the third concrete accumulation section C3) can be accumulated. Thus, by discharging the accumulated concrete C to the outside of the pipe body 12, material segregation of the concrete C discharged into the concrete pouring space S can be suppressed even if it spans multiple days.

[0059] In this embodiment, as shown in Figure 5, the concrete pouring piping 10 comprises a plurality of pipe bodies 12, a receiving section 11b for receiving concrete C, and a concrete distribution member 11 having a plurality of branching sections 11c extending from the receiving section 11b to the respective openings 13 of the plurality of pipe bodies 12. In this case, by placing concrete C into the receiving section 11b, concrete C can be injected into each of the plurality of pipe bodies 12 via the concrete distribution member 11. Therefore, even when constructing a huge structure such as a column 3, the concrete pouring work can be carried out efficiently.

[0060] (Second Embodiment) Next, the pipe body 22 of the concrete pouring piping according to the second embodiment will be described with reference to Figure 12. Some of the components of the concrete pouring piping described below are the same as some of the components of the concrete pouring piping 10 described above. Therefore, in the following description, the same components as those described above will be denoted by the same reference numerals and omitted as appropriate.

[0061] As shown in Figure 12, the pipe body 22 has a storage section 25 that protrudes from around the hole 15 to the outside of the pipe body 22 in a plan view and stores the concrete C that passes through the hole 15. For example, the arrangement of the storage section 25 in the pipe body 22 may be the same as the arrangement of the hole 15 in the pipe body 12.

[0062] The pipe body 22 has a plurality of storage sections 25 arranged along the longitudinal direction D1. For example, two adjacent storage sections 25 along the longitudinal direction D1 protrude in opposite directions (left and right in Figure 12) from the pipe body 22. This makes it possible to discharge concrete C from the two storage sections 25 in opposite directions.

[0063] The storage section 25 has a leak outlet 25d from which the stored concrete C leaks out. The leak outlet 25d is, for example, oriented vertically upward or diagonally upward. In this case, the concrete C can be stored in the storage section 25 for a longer period of time, so material segregation of the concrete C can be suppressed more reliably. For example, the storage section 25 has an expansion section 25b that protrudes to the outside of the pipe body 22 from the lower end of the storage section 25, and a constricted section 25c that narrows inward from the upper end of the expansion section 25b and protrudes outward at the upper end.

[0064] As described above, the pipe body 22 of the concrete pouring piping according to the second embodiment has a storage section 25 that protrudes from around the hole 15 to the outside of the pipe body 22 in a plan view and stores the concrete C that has passed through the hole 15. The storage section 25 has a leak outlet 25d from which the stored concrete C leaks out. In this case, the concrete C that comes out of the hole 15 is temporarily stored in the storage section 25 and then leaks out into the concrete pouring space S from the leak outlet 25d of the storage section 25. By temporarily storing the concrete C in the storage section 25 before it comes out into the concrete pouring space S in this way, material separation of the concrete C discharged into the concrete pouring space S can be suppressed more reliably.

[0065] (Third embodiment) Next, the pipe body 32 of the concrete pouring piping according to the third embodiment will be described with reference to Figure 13. The pipe body 32 has a storage section 35 that has a different shape from the storage section 25. The storage section 35 has a rod-shaped portion 35b that extends from the hole 15 to the outside of the pipe body 32 in a plan view, and a leak outlet 35d located at the tip of the rod-shaped portion 35b.

[0066] The rod-shaped portion 35b is tubular in shape. Concrete C that has passed through the hole 15 is stored in the rod-shaped portion 35b. The rod-shaped portion 35b extends diagonally upward relative to the hole 15. The leak outlet 35d is formed at a position higher than the upper end of the hole 15. As an example, the leak outlet 35d is elliptical in shape. For example, the leak outlet 35d is shaped as a cross-section of the rod-shaped portion 35b, which extends diagonally upward from the hole 15, by a plane extending horizontally. In this case, the leak outlet 35d faces vertically upward and is elliptical in shape. However, the leak outlet 35d may also face diagonally upward, and the orientation and shape of the leak outlet 35d are not particularly limited.

[0067] In the third embodiment described above, the leakage outlet 35d is formed at a position higher than the upper end of the hole 15. Therefore, because the position of the leakage outlet 35d is higher than the upper end of the hole 15, the time that concrete C is stored in the storage section 35 can be extended. Consequently, material segregation of concrete C leaking from the leakage outlet 35d into the concrete pouring space S can be suppressed even more reliably.

[0068] (Fourth Embodiment) Next, the concrete pouring piping according to the fourth embodiment will be described with reference to Figure 14. As shown in Figure 14, the concrete pouring piping according to the fourth embodiment comprises multiple types of pipe bodies 42 of different lengths. The multiple types of pipe bodies 42 include, for example, a first pipe body 42A and a second pipe body 42B that is shorter than the first pipe body 42A.

[0069] The first pipe body 42A has multiple holes 15 in a region located a certain distance above its lower end, and no holes 15 outside of that region. The second pipe body 42B, similar to the first pipe body 42A, also has multiple holes 15 in a region located a certain distance above its lower end, and no holes 15 outside of that region.

[0070] When the upper end of the second pipe body 42B is aligned with the upper end of the first pipe body 42A, the region in which the hole 15 is formed in the first pipe body 42A and the region in which the hole 15 is formed in the second pipe body 42B are offset from each other. According to the concrete pouring piping according to the fourth embodiment, concrete C can be injected into the area around the hole 15 by the first pipe body 42A, and concrete C can be injected into the area around the hole 15 at a different height from the hole 15 in the first pipe body 42A by the second pipe body 42B.

[0071] (Fifth embodiment) Next, the concrete pouring piping according to the fifth embodiment will be described with reference to Figure 15. As shown in Figure 15, the concrete pouring piping according to the fifth embodiment includes a concrete distribution member 51 that is different in form from the concrete distribution member 11. The concrete distribution member 51 has a receiving section 11b, a vibrator 11d, and a plurality of branch sections 51c that extend from the lower part of the receiving section 11b.

[0072] The branch section 51c is tubular in shape. The branch section 51c has a leak outlet 51d at the base of the branch section 51c, from which concrete C leaks out. Because the leak outlet 51d is formed at the base of the branch section 51c, concrete C can be accumulated at the tip of the branch section 51c before leaking out from the leak outlet 51d. Therefore, material separation of concrete C coming out of the concrete distribution member 51 can be suppressed more reliably.

[0073] (Sixth Embodiment) Next, a concrete pouring pipe according to the sixth embodiment will be described with reference to Figure 16. As shown in Figure 16, the concrete pouring pipe according to the sixth embodiment comprises a pipe body 62 and a sliding member 63 on which concrete C is placed inside the pipe body 62. The sliding member 63 slides along the inner surface of the pipe body 62 as the concrete C flows down inside the pipe body 62. The frictional force of the sliding member 63 against the inner surface of the pipe body 62 is adjusted according to the falling speed of the concrete C.

[0074] The sliding member 63 is bag-shaped with gas filling its interior. The sliding member 63 may be made of an expandable material. For example, the sliding member 63 is made of resin (rubber as an example). The sliding member 63 is spherical when inflated. The diameter of the sliding member 63 when inflated is greater than or equal to the inner diameter of the pipe body 62. When concrete C flows down inside the pipe body 62, the sliding member 63 slides along the inner surface of the pipe body 62 and is pushed downward.

[0075] The pipe body 62 has a breaking section 64 at its lower end that destroys the sliding member 63, and a leak outlet 65 from which concrete C leaks out. For example, the breaking section 64 and the leak outlet 65 are provided in the aforementioned first concrete reservoir C1. For example, the breaking section 64 is needle-shaped. The breaking section 64 pierces the sliding member 63, which has been pushed up to the lower end of the pipe body 62, and destroys the sliding member 63.

[0076] The concrete C flowing down inside the pipe body 62 moves slowly downward together with the sliding member 63, and after the sliding member 63 reaches the failure section 64 and fails, it leaks out of the pipe body 62 from the leak outlet 65. Therefore, material separation of the concrete C leaking out of the pipe body 62 is suppressed. The failure section 64 and the leak outlet 65 may be provided in at least one of the second concrete accumulation section C2, the third concrete accumulation section C3, and the fourth concrete accumulation section C4.

[0077] As described above, the concrete pouring pipe according to the sixth embodiment includes a pipe body 62 on which concrete C is placed, and a sliding member 63 that slides along the inner surface of the pipe body 62 as the concrete C flows down inside the pipe body 62. In this case, the concrete C accumulates on the sliding member 63 as it falls, and the sliding member 63 gradually slides downward as a result. At this time, the concrete C accumulated on the sliding member 63 moves slowly downward together with the sliding member 63. By accumulating concrete C on the sliding member 63 in this way, material segregation of the concrete C can be suppressed more reliably.

[0078] (Seventh Embodiment) Next, a concrete pouring pipe according to the seventh embodiment will be described with reference to Figure 17. As shown in Figure 17, the concrete pouring pipe according to the seventh embodiment includes a pipe body 72 in which holes 75 of a different nature from the holes 15 are formed. The holes 75 have a grid 73. The grid 73 has a plurality of first linear members that straddle the holes 75 and extend along a first direction (for example, the vertical direction in Figure 17), and a plurality of second linear members that straddle the holes 75 and extend along a second direction different from the first direction (for example, the left-right direction in Figure 17).

[0079] Furthermore, the grid 73 may be a metal lath fixed to the inner surface of the pipe body 72, or it may be a grid of reinforcing bars. By providing the pipe body 72 with a grid 73 formed in the hole 75, the rate at which concrete C leaks out of the hole 75 to the outside of the pipe body 72 can be reduced, thereby more reliably suppressing material segregation of concrete C.

[0080] (Eighth embodiment) Next, the concrete pouring piping according to the eighth embodiment will be described with reference to Figure 18. As shown in Figure 18, the concrete pouring piping according to the eighth embodiment differs from the concrete pouring piping 10 described above in that a swinging member 83 is provided in the hole 85 of the pipe body 82.

[0081] The pipe body 82 has a hinge portion 84 fixed to the upper part of the hole 85, and the swinging member 83 is made capable of swinging around the hinge portion 84. For example, before the concrete C is poured into the inside of the pipe body 82, the swinging member 83 extends laterally. When the concrete C flowing down inside the pipe body 82 comes into contact with the swinging member 83, the swinging member 83 moves downward to close the hole 85. The concrete C moves below the hole 85, and the concrete C that has overflowed up to the hole 85 inside the pipe body 82 leaks out from the hole 85. Therefore, the velocity of the concrete C leaking out from the hole 85 can be reduced, and thus material segregation of the concrete C can be suppressed.

[0082] The various embodiments of the concrete pouring piping according to this disclosure have been described above. However, this disclosure is not limited to the embodiments described above and may be further modified without changing the gist of the claims. That is, the shape, size, material, number, and arrangement of each part of the concrete pouring piping according to this disclosure can be appropriately changed within the scope of the gist described above. Furthermore, the first to eighth embodiments have been described above. The concrete pouring piping according to this disclosure may be a combination of some forms from the first to eighth embodiments and other forms different from those forms from the first to eighth embodiments.

[0083] For example, in the embodiment described above, an example was described in which the concrete pouring space S has a first lift F1, a second lift F2, a third lift F3, and a fourth lift F4. However, the number of lifts in the concrete pouring space does not have to be four; it may be two, three, or five or more.

[0084] For example, in the embodiment described above, an example was described in which the structure constructed by the concrete pouring pipe 10 is a column 3 of the hybrid floating body 1. However, the structure constructed by the concrete pouring pipe according to this disclosure is not limited to a column 3 of the hybrid floating body 1, but may also be, for example, an outer column 2 of the hybrid floating body 1, or a structure other than the hybrid floating body 1. Thus, the concrete pouring pipe according to this disclosure is applicable to various structures. [Explanation of Symbols]

[0085] 1…Hybrid floating body, 2…Outer column, 3…Column, 3b…Tower joint, 3c…Diaphragm, 3d…Flange, 3f…Stage, 4…Lower hull, 4b…Central section, 4c…Extended section, 4d…Base section, 4f…Tip section, 4g…First corner section, 4h…Second corner section, 5…Outer steel plate, 5b…Inner surface, 5c…Headed stud, 6…Inner steel plate, 6b…Outer surface, 6c…Headed stud, 7…Reinforcement member, 7A…First reinforcement member group, 7B…Second reinforcement Component group, 10...Concrete pouring piping, 11...Concrete distribution member, 11b...Receiving section, 11c...Branching section, 11d...Vibrator, 11f...Opening, 11g...Bottom surface, 12A...First lift section, 12B...Second lift section, 12C...Third lift section, 12D...Fourth lift section, 13...Opening, 15...Hole, 15A...First hole group, 15B...Second hole group, 15C...Third hole group, 15D...Fourth hole group, 17...Shock absorber, 17b...First reinforcing bar, 17c... Second reinforcing bar, 25...Storage section, 25b...Expansion section, 25c...Neck section, 25d...Leakage outlet, 35...Storage section, 35b...Rod-shaped section, 35d...Leakage outlet, 51...Concrete distribution member, 51c...Branching section, 51d...Leakage outlet, 63...Sliding member, 64...Breakage section, 65...Leakage outlet, 73...Grid, 75...Hole, 83...Oscillating member, 84...Hinge section, 85...Hole, A...Site, B...Pump truck, B1...Boom, B2...Transport piping, C...Concrete, C1...First section Concrete accumulation area, C2...Second concrete accumulation area, C3...Third concrete accumulation area, C4...Fourth concrete accumulation area, D1...Longitudinal direction, D2...Circumferential direction, F1...First lift, F2...Second lift, F3...Third lift, F4...Fourth lift, G...Support structure, L1...Diameter, L3...Distance, L4...Diameter, P...Spacing, S...Concrete pouring space, X1, X2...Distance, Z1...First boundary, Z2...Second boundary, Z3...Third boundary.

Claims

1. It comprises a pipe body that is positioned to extend vertically and into which concrete is injected through an opening formed at its upper end. The pipe body has a plurality of holes arranged along the longitudinal direction of the pipe body, The pipe body has a first lift section which is the region from the lower end of the pipe body to a first height, and a second lift section which is the region from the first height to a second height which is higher than the first height. A first pour is performed in which the concrete is discharged from the hole formed in the first lift section of the pipe body to pour the concrete up to a first height, and a second pour is performed after the first pour has passed, in which the concrete is discharged from the hole formed in the second lift section of the pipe body to pour the concrete up to a second height. The distance from the lowest hole of the second lift section among the multiple holes to the first boundary between the first lift section and the second lift section is longer than the distance from the highest hole of the first lift section among the multiple holes to the first boundary. Concrete pouring and piping.

2. The pipe body further has a third lift section which is a region from the second height to a third height that is higher than the second height. After the second pouring operation, a third pouring operation is performed in which the concrete is discharged from the hole formed in the third lift section of the pipe body to pour the concrete up to the third height. The distance from the hole located at the bottom of the third lift section among the plurality of holes to the second boundary between the second lift section and the third lift section is longer than the distance from the hole located at the top of the second lift section among the plurality of holes to the second boundary. Concrete pouring piping according to claim 1.

3. The pipe body has a storage section that protrudes from around the hole to the outside of the pipe body in a plan view and stores the concrete that has passed through the hole. The storage section has a leak outlet from which the stored concrete leaks out. Concrete pouring piping according to claim 1 or 2.

4. The aforementioned leak outlet is formed at a position higher than the upper end of the hole. Concrete pouring piping according to claim 3.

5. The pipe body is equipped with a sliding member that holds the concrete inside and slides along the inner surface of the pipe body as the concrete flows down inside the pipe body. Concrete pouring piping according to claim 1 or 2.

6. Multiple pipe bodies, A concrete distribution member having a receiving section for receiving the concrete, and a plurality of branching sections extending from the receiving section to the respective openings of the plurality of pipe bodies, Equipped with, Concrete pouring piping according to claim 1 or 2.

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