JP2024123608A - Concrete pouring piping - Google Patents

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

This disclosure relates to concrete pouring piping through which poured concrete passes.

Patent Document 1 describes a concrete pouring method for constructing a side wall by pouring concrete through a distribution pipe arranged in a pouring space. In constructing the side wall, multiple formworks are installed, and concrete is poured through the distribution pipe into the pouring space defined by the multiple formworks. Reinforcing bars are installed in the pouring space, and high-flow concrete is poured.

The distribution pipe has multiple through holes formed in the pipe wall. The multiple distribution pipes are inserted into the casting space from above the formwork, threading between the rebars. High-fluidity concrete is poured into each distribution pipe from a hopper installed at the top end, and the high-fluidity concrete poured into each distribution pipe is supplied into the casting space through the through holes. The height from the bottom end of the distribution pipe to the bottom end of the lowest through hole is set to be 100 mm or more.

Three distribution pipes are installed within the formwork, and highly fluid concrete is injected into the casting space through each of the three distribution pipes. When the height of the highly fluid concrete in the casting space reaches a specified cast height, the first layer of highly fluid concrete is formed. Highly fluid concrete is then injected again through each distribution pipe, and when the height of the highly fluid concrete reaches a specified cast height higher than the first layer, the second layer of highly fluid concrete is formed.

JP 2021-139199 A

However, when constructing a huge structure, pouring concrete into the pouring space may not be completed in a day. Furthermore, when constructing a huge structure, the concrete pouring pipes may become long. If such concrete pouring pipes are arranged to extend vertically and concrete is poured into the concrete pouring pipes, there is a possibility that material separation will occur as the concrete falls vertically. In other words, there is a concern that material separation will occur when the concrete moves vertically downward due to free fall inside the concrete pouring pipes.

The present disclosure aims to provide concrete pouring piping that can suppress separation of concrete materials even when constructing large structures.

The concrete pouring pipe according to the present disclosure (1) comprises a pipe body arranged to extend vertically and into which concrete is poured from an opening formed at the 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 an area from the lower end of the pipe body to a first height, and a second lift section which is an area from the first height to a second height higher than the first height. A first pouring step is performed in which concrete is poured up to the first height by discharging concrete from a hole formed in the first lift section of the pipe body, and a second pouring step is performed in which concrete is poured up to the second height by discharging concrete from a hole formed in the second lift section of the pipe body a day after the first pouring step. The distance from the lowest hole of the second lift section among the plurality of holes to the first boundary section 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 plurality of holes to the first boundary section.

This concrete pouring piping includes a pipe body into which concrete is poured, and a plurality of holes are formed in the pipe body from which concrete is discharged. The pipe body has at least a first lift section and a second lift section. The first lift section is a region of the pipe body from the lower end of the pipe body to the first height, and the second lift section is a region of the pipe body from the first height to the second height. Using this concrete pouring piping, a first pouring is performed in which concrete is poured from a hole formed in the first lift section to the first height, and a day after the first pouring, a second pouring is performed in which concrete is poured from a hole formed in the second lift section to the second height. The distance from the lowest hole in 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 highest hole in the first lift section to the first boundary. Therefore, when the second pour is performed on a day other than the day the first pour was performed, the distance from the lowest hole of the second lift section to the first boundary is longer than the distance from the highest hole of the first lift section to the first boundary, so that the length from the lowest hole of the second lift section to the first boundary can be increased. As a result, when the second pour is performed on a day other than the day the first pour was performed, the concrete that has fallen can be stored in the portion of the pipe body from the first boundary to the lowest hole of the second lift section. By storing the concrete in this portion and then discharging the concrete from the hole of the second lift section to the outside of the pipe body, material separation of the concrete discharged into the concrete pouring space can be suppressed.

(2) In the above (1), the pipe body may further have a third lift section which is an area from the second height to a third height higher than the second height. A third casting may be performed in which concrete is discharged from a hole formed in the third lift section of the pipe body after a day has passed since the second casting, and concrete is cast up to the third height. The distance from the lowest hole of the third lift among the multiple holes to the second boundary section 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 section. In this case, the distance from the lowest hole of the third lift section to the second boundary section is longer than the distance from the highest hole of the second lift section to the second boundary section, so that the length from the lowest hole of the third lift section to the second boundary section can be increased. Therefore, when the third casting is performed, the concrete that has fallen can be stored in the portion from the second boundary section to the lowest hole of the third lift section in the pipe body. Therefore, by discharging the stored concrete to the outside of the pipe body, separation of the concrete material discharged into the concrete pouring space can be suppressed even over multiple days.

(3) In the above (1) or (2), the pipe body may have a storage section that protrudes from the periphery of 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 leakage outlet from which the stored concrete leaks out. In this case, the concrete that has leaked out of the hole is temporarily stored in the storage section, and then leaks from the leakage outlet of the storage section into the concrete pouring space. By temporarily storing the concrete in the storage section before it exits into the concrete pouring space in this way, material separation of the concrete discharged into the concrete pouring space can be more reliably suppressed.

(4) In the above (3), the leakage outlet may be formed at a position higher than the upper end of the hole. In this case, by positioning the leakage outlet higher than the upper end of the hole, the time for which the concrete is stored in the storage section can be extended. Therefore, material separation of the concrete leaking from the leakage outlet into the concrete pouring space can be more reliably suppressed.

(5) In any of (1) to (4) above, the concrete pouring pipe may include a sliding member on which the concrete inside the pipe body is placed and which slides on 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. At this time, the concrete accumulated on the sliding member moves slowly downward together with the sliding member. By accumulating the concrete on the sliding member in this way, material separation of the concrete can be more reliably suppressed.

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

According to the present disclosure, it is possible to prevent separation of concrete materials even when constructing large structures.

FIG. 1 is a perspective view showing a hybrid floating body including an example structure constructed by concrete pouring piping according to an embodiment. FIG. 2 is a plan view showing the hybrid floating body of FIG. 1. FIG. 2 is a cross-sectional view of a column, which is an example of the structure of FIG. 1 . 3A is a cross-sectional view taken along line AA in FIG. 3, and FIG. 3B is a cross-sectional view taken along line BB in FIG. FIG. 4 is a plan view of the site to illustrate the construction of the column of FIG. 3. FIG. 4 is a cross-sectional view of a site illustrating the construction of the column of FIG. 3. FIG. 2 is a perspective view showing a concrete distribution member of the concrete pouring pipe according to the embodiment. FIG. 8 is a plan view of the concrete distribution member of FIG. 7 . FIG. 2 is a side view showing a pipe body of a concrete pouring piping according to an embodiment. FIG. 10 is a side view showing the holes in the tube body of FIG. FIG. 10 is a perspective view showing the lower end of the tube body of FIG. FIG. 11 is a view showing a tube body according to a second embodiment. FIG. 13 is a view showing a pipe body according to a third embodiment. FIG. 13 is a view showing a tube body according to a fourth embodiment. A diagram showing a concrete distribution member of a concrete pouring piping according to a fifth embodiment. A cross-sectional view showing a sliding member of a concrete poured piping according to a sixth embodiment. A diagram showing the pipe body of a concrete pouring piping according to the seventh embodiment. A cross-sectional view showing the pipe body of a concrete pouring piping according to the eighth embodiment.

Below, an embodiment of a concrete pouring 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 given the same reference numerals, and duplicated descriptions will be omitted as appropriate. The drawings may be partially simplified or exaggerated to facilitate understanding, and the dimensional ratios, etc. are not limited to those shown in the drawings.

Figure 1 is a perspective view showing a hybrid float 1 having a structure constructed by concrete pouring piping according to this embodiment. Figure 2 is a plan view of the hybrid float 1. For example, the hybrid float 1 is the foundation structure of a wind power generator. The wind power generator performs, for example, offshore wind power generation. The hybrid float 1 is a semi-submersible type (semi-sub type) floating structure.

The hybrid float 1 comprises a column 3 located at the center of the hybrid float 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 where 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 the column 3.

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

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

As shown in FIG. 3, the tower joint 3b has, 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 FIG. 4(a) and the like).

The height L5 of the column 3 is, for example, 30 m or more and 40 m or less. The column 3 has, for example, a steel shell concrete structure (a composite structure of steel and concrete). In this case, the column 3 includes 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 have an annular shape. In a plan view, the diameter of the outer steel plate 5 is, for example, 10 m or more and 15 m or less (11 m as an example). In a plan view, the diameter of the inner steel plate 6 is, for example, 8 m or more and 13 m or less (10 m as an example).

In the column 3, a concrete pouring space S is formed between the outer steel plate 5 and the inner steel plate 6, into which concrete C is poured. The outer steel plate 5 has a plurality of headed studs 5c that protrude from the inner surface 5b of the outer steel plate 5 toward the inner steel plate 6. The inner steel plate 6 has a plurality of headed studs 6c that protrude from the outer surface 6b of the inner steel plate 6 toward the outer steel plate 5.

Figure 4(a) is a cross-sectional view taken along line A-A in Figure 3. Figure 4(b) is a cross-sectional view taken along line B-B in Figure 3. As shown in Figures 3, 4(a) and 4(b), the headed studs 5c and the headed studs 6c are arranged so as to be aligned along the longitudinal direction D1 (vertical direction) of the column 3 and also aligned along the circumferential direction D2 of the column 3.

The column 3 includes a reinforcing member 7 that reinforces the outer steel plate 5 and the inner steel plate 6. The reinforcing member 7 is, for example, a reinforcing plate. The reinforcing member 7 extends from the inner surface 5b of the outer steel plate 5 to the outer surface 6b of the inner steel plate 6. The column 3 includes multiple reinforcing members 7, and the multiple reinforcing members 7 are arranged along the circumferential direction D2 of the column 3.

In this embodiment, the column 3 has a first reinforcing member group 7A and a second reinforcing member group 7B, each of which includes a plurality of reinforcing members 7. The first reinforcing member group 7A is located in the upper portion of the column 3. In other words, the first reinforcing member group 7A is located above the center of the column 3 in the longitudinal direction D1. The second reinforcing member group 7B is located, for example, in the central portion of the column 3 in the longitudinal direction D1. For example, the height of the lower end of the second reinforcing member group 7B is higher than the height of the lower hull 4 described above.

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 set up, for example, in a dock. At site A, an outer steel plate 5, an inner steel plate 6, and a tower joint 3b are installed on a platform G installed on the ground, and a pump vehicle B arranged at site A pours concrete C from above into a concrete pouring space S. Pump vehicle B has an extendable boom B1 and a transport pipe B2 arranged along the boom B1.

The concrete pouring pipe 10 according to this embodiment has 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 eight. However, the number of pipe bodies 12 is not particularly limited.

The column 3 has a stage 3f that extends horizontally above the outer steel plate 5 and the inner steel plate 6. The transport pipe B2 extends from the upper end of the boom B1 to a concrete distribution member 11 provided on the stage 3f. The pump vehicle B supplies concrete C to the concrete distribution member 11 via the transport pipe B2, and the concrete distribution member 11 distributes the supplied concrete C to each of the multiple pipe bodies 12.

The multiple pipe bodies 12 are arranged so as to be aligned along the circumferential direction D2 of the column 3. The pipe bodies 12 are arranged so as 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 injected into the pipe bodies 12 from the concrete distribution member 11. More specifically, the pipe body 12 has an opening 13 formed at its upper end, and the concrete C is injected into the inside of the pipe body 12 from the opening 13.

For example, the pipe body 12 is buried after the concrete C has been poured into the concrete pouring space S. The length of the pipe body 12 is, for example, approximately the same as the length of the column 3, and the pipe body 12 is inserted near the bottom end of the concrete pouring space S and ejects the concrete C from a hole 15 (see FIG. 9) described below. Details of the pipe body 12 will be described later.

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 portion 11b that receives concrete C, and a plurality of branch portions 11c extending from the lower portion of the receiving portion 11b. The receiving portion 11b receives the concrete C from, for example, the transport pipe B2. The receiving portion 11b has, for example, a bottomed cylindrical shape.

The concrete distribution member 11 may include a vibrator 11d fixed to the receiving portion 11b. Although FIG. 7 shows an example in which the concrete distribution member 11 includes multiple vibrators 11d, the number of vibrators 11d is not particularly limited. The vibrator 11d is attached to the outer surface of the receiving portion 11b. For example, the vibrator 11d applies vibrations to the concrete C via the receiving portion 11b. In this case, air bubbles can be removed from the concrete C to improve the quality of the concrete C.

The branching portion 11c is tubular. The branching portion 11c has an opening 11f at its upper end. Each of the multiple branching portions 11c extends from the receiving portion 11b to the opening 13 of each of the multiple pipe bodies 12. The concrete C received by the receiving portion 11b is accumulated in the receiving portion 11b and distributed from the opening 11f through the branching portion 11c to each of the multiple pipe bodies 12.

Multiple openings 11f are formed on the bottom surface 11g of the receiving portion 11b. By forming multiple openings 11f on the bottom surface 11g of the receiving portion 11b, it is possible to pour concrete C into the receiving portion 11b and distribute the concrete C evenly to the pipe body 12 via the branch portion 11c. Furthermore, it is also possible to adjust the amount of concrete C 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, it is possible to prevent concrete C from accumulating on the bottom surface 11g.

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

The holes 15 are holes for pouring the concrete C passing through the inside of the pipe body 12 into the concrete pouring space S. That is, the concrete C passing 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 as to face in opposite directions (left and right directions in FIG. 9). In this case, the concrete C can be poured in opposite directions from parts of the pipe body 12 at the same height.

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

The first lift F1 is located at the bottom end of the 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 area from the top end of the third lift F3 to the top end of the 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 top end of the column 3. For example, the height of the top 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 top end of the second reinforcing member group 7B is higher than the first height H1 and lower than the second height H2.

In this embodiment, the structure constructed by the concrete pouring pipe 10 is a huge column 3 with a height of 30 m or more, so the pouring of the concrete C must be done over several days. "Over several days" means that the pouring of the concrete C is not completed in one day, but is done over several days.

In this embodiment, a first pour is performed to pour concrete C up to a first height H1, a second pour is performed to pour concrete C up to a second height H2 a day after the first pour, a third pour is performed to pour concrete C up to a third height H3 a day after the second pour, and a fourth pour is performed to pour concrete C up to a fourth height H4 a day after the third pour.

That is, the first pour is made into the first lift F1 first, and the second pour is made into the second lift F2 on a different day from the first pour. Then, the third pour is made into the third lift F3 on a different day from the second pour, and the fourth pour is made into the fourth lift F4 on a different day from the third pour. In this case, the second reinforcing member group 7B is embedded in the concrete C during the second pour, and the first reinforcing member group 7A is embedded in the concrete C during the fourth pour.

The concrete C poured at the end of the first pour may be harder to harden than the concrete C poured at any time other than the end of the first pour. In this case, when the second pour is performed on a day after the first pour, the concrete C that is harder to harden and located at the first height H1 can be used as a cushion, thereby preventing separation of the concrete C during the second pour. The same applies to the concrete C poured at the end of the second pour and the concrete C poured at the end of the third pour.

The arrangement of the holes 15 in the tube body 12 is determined according to the lifts described above. The tube body 12 has a first hole group 15A, which is a plurality of holes 15 that open to the first lift F1, a second hole group 15B, which is a plurality of holes 15 that open to the second lift F2, a third hole group 15C, which is a plurality of holes 15 that open to the third lift F3, and a fourth hole group 15D, which is a plurality of holes 15 that open to the fourth lift F4.

The pipe body 12 has a first lift section 12A, which is an area from the lower end of the pipe body 12 to a first height H1, a second lift section 12B, which is an area from the first height H1 to a second height H2, a third lift section 12C, which is an area from the second height H2 to a third height H3, and a fourth lift section 12D, which is an area from the third height H3 to a fourth height H4. The first pour is performed by discharging concrete C from the holes 15 (first hole group 15A) formed in the first lift section 12A into the concrete pouring space S, and the second pour is performed by discharging concrete C from the holes 15 (second hole group 15B) formed in the second lift section 12B into the concrete pouring space S. Similarly, the third pour is performed by discharging concrete C from the holes 15 (third hole group 15C) formed in the third lift section 12C, and the fourth pour is performed by discharging concrete C from the holes 15 (fourth hole group 15D) formed in the fourth lift section 12D.

The pipe body 12 has, for example, a first concrete pit C1 located at the bottom of the first lift section 12A, a second concrete pit C2 located at the bottom of the second lift section 12B, a third concrete pit C3 located at the bottom of the third lift section 12C, and a fourth concrete pit C4 located at the bottom of the fourth lift section 12D. The first concrete pit C1 indicates the area where concrete C accumulates from the bottom end of the first lift section 12A to the lowest hole 15 of the first lift section 12A. The second concrete pit C2 indicates the area where concrete C accumulates from the bottom end of the second lift section 12B to the lowest hole 15 of the second lift section 12B. Similarly, the third concrete reservoir C3 is the area from the bottom end of the third lift section 12C to the lowest hole 15 of the third lift section 12C, and the fourth concrete reservoir C4 is the area from the bottom end of the fourth lift section 12D to the lowest hole 15 of the fourth lift section 12D.

For example, the spacing P (pitch) between the multiple holes 15 aligned along the longitudinal direction D1 is constant at locations other than the first concrete reservoir C1, the second concrete reservoir C2, the third concrete reservoir C3, and the fourth concrete reservoir C4. The height of the first concrete reservoir C1, i.e., the distance X1 from the lowest hole 15 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 separation in the concrete C discharged from the hole 15. In other words, during the first casting, by storing concrete C in the first concrete reservoir C1 before discharging the concrete C from the hole 15, material separation of the concrete C discharged from the hole 15 is suppressed.

For example, the height of the second concrete reservoir C2, the height of the third concrete reservoir C3, and the height of the fourth concrete reservoir C4 are the same as the above-mentioned distance X1. The value of distance X1 is, for example, 1.0 m or more and 2.0 m or less. However, the value of distance X1 varies depending on the height of the structure. For example, when the height of the structure is about 20 m, distance X1 is 0.5 m or more and 1.0 m or less, and when the height of the structure is about 10 m, distance X1 is 0.25 m or more and 0.5 m or less. When the height of the structure is about 5 m, distance X1 is 0.1 m or more and 0.25 m or less. In this way, the value of distance X1 can be changed as appropriate.

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. The 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 matches the first height H1.

As described above, 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. And 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.

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 provided with a shock absorbing material 17 that absorbs the shock of the concrete C that falls into the first concrete reservoir C1. The shock absorbing material 17 is provided on the inner surface of the pipe body 12. The shock absorbing material 17 includes, for example, a rod-shaped first reinforcing bar 17b having one and the other ends welded to the inner surface of the pipe body 12, and a rod-shaped second reinforcing bar 17c having one and the other ends welded to the inner surface of the pipe body 12 and intersecting the first reinforcing bar 17b.

That is, the shock absorbing material 17 is composed of lattice steel bars. When the shock absorbing material 17 is provided in the first concrete reservoir C1, the shock of the concrete C is absorbed in the first concrete reservoir C1, so that separation of the concrete C can be suppressed. The shock absorbing material 17 may be provided in at least one of the second concrete reservoir C2, the third concrete reservoir C3, and the fourth concrete reservoir C4.

Next, the effects 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 includes a pipe body 12 into which concrete C is poured, and the pipe body 12 has a plurality of holes 15 through which the concrete C is ejected. 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 the first height H1, and the second lift section 12B is the region of the pipe body 12 from the first height H1 to the second height H2.

Using the concrete pouring piping 10, a first pouring is performed in which concrete C is poured from the hole 15 formed in the first lift section 12A to a first height H1, and a day after the first pouring, a second pouring is performed in which concrete C is poured from the hole 15 formed in the second lift section 12B to a second height H2. The distance X1 from the lowest hole 15 of 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 of the first lift section 12A to the first boundary Z1.

Therefore, when the second pour is performed on a day other than the day of the first pour, 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, so that the length from the lowest hole 15 of the second lift section 12B to the first boundary Z1 can be increased. As a result, when the second pour is performed on a day other than the day of the first pour, the concrete C that has fallen can be stored in the portion of the pipe body 12 from the first boundary Z1 to the lowest hole 15 of the second lift section 12B (second concrete reservoir C2). By storing the concrete C in this portion and then discharging the concrete C from the hole 15 of the second lift section 12B to the outside of the pipe body 12, material separation of the concrete C discharged into the concrete pouring space S can be suppressed.

In this embodiment, the pipe body 12 further has a third lift section 12C, which is an area from the second height H2 to a third height H3 higher than the second height H2. A day after the second casting, a third casting is performed in which concrete C is discharged from a hole 15 formed in the third lift section 12C of the pipe body 12 and concrete C is cast up to the third height H3. The distance X1 from the lowest hole 15 of the third lift section 12C among the multiple holes 15 to the second boundary section 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 multiple holes 15 of the second lift section 12B to the second boundary section Z2.

In this case, the distance X1 from the lowest hole 15 of the third lift section 12C to the second boundary Z2 is longer than the distance from the uppermost hole 15 of the second lift section 12B to the second boundary Z2, so that the length from the lowest hole 15 of the third lift section 12C to the second boundary Z2 can be increased. Therefore, when performing the third pouring, the concrete C that has fallen can be stored in the portion of the pipe body 12 from the second boundary Z2 to the lowest hole 15 of the third lift section 12C (the third concrete reservoir C3). Therefore, by discharging the stored concrete C to the outside of the pipe body 12, material separation of the concrete C discharged into the concrete pouring space S can be suppressed even over multiple days.

In this embodiment, as shown in FIG. 5, the concrete pouring pipe 10 includes multiple pipe bodies 12, a receiving portion 11b for receiving concrete C, and a concrete distribution member 11 having multiple branch portions 11c extending from the receiving portion 11b to the openings 13 of the multiple pipe bodies 12. In this case, by putting concrete C into the receiving portion 11b, the concrete C can be injected into each of the multiple pipe bodies 12 via the concrete distribution member 11. Therefore, the concrete C can be poured efficiently even when constructing a huge structure such as a column 3.

Second Embodiment
Next, the pipe body 22 of the concrete pouring piping according to the second embodiment will be described with reference to Fig. 12. The configuration of a portion of the concrete pouring piping described below is the same as the configuration of a portion of the concrete pouring piping 10 described above. Therefore, in the following description, the same explanations as those already given will be omitted as appropriate by assigning the same reference numerals.

As shown in FIG. 12, the pipe body 22 has a storage section 25 that protrudes from the periphery of 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. 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.

The pipe body 22 has multiple storage sections 25 arranged along the longitudinal direction D1. For example, two storage sections 25 adjacent to each other along the longitudinal direction D1 protrude in opposite directions from each other in the pipe body 22 (left and right directions in FIG. 12). This makes it possible to eject concrete C from the two storage sections 25 in opposite directions from each other.

The storage section 25 has a leakage port 25d through which the stored concrete C leaks out. The leakage port 25d faces, for example, 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 that material separation of the concrete C can be more reliably suppressed. For example, the storage section 25 has an expansion section 25b that protrudes from the lower end of the storage section 25 to the outside of the pipe body 22, and a constricted section 25c that constricts inward from the upper end of the expansion section 25b and protrudes outward at the upper end.

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 the periphery of 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 leakage outlet 25d from which the stored concrete C leaks out. In this case, the concrete C that has come out of the hole 15 is temporarily stored in the storage section 25, and then leaks from the leakage outlet 25d of the storage section 25 into the concrete pouring space S. By temporarily storing the concrete C in the storage section 25 before it leaves the concrete pouring space S in this way, material separation of the concrete C discharged into the concrete pouring space S can be more reliably suppressed.

Third Embodiment
Next, the pipe body 32 of the concrete pouring piping according to the third embodiment will be described with reference to Fig. 13. The pipe body 32 has a storage portion 35 having a shape different from that of the storage portion 25. The storage portion 35 has a rod-shaped portion 35b extending from the hole 15 to the outside of the pipe body 32 in a plan view, and a leakage outlet 35d located at the tip of the rod-shaped portion 35b.

The rod-shaped portion 35b has a tubular shape. The 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 leakage outlet 35d is formed at a position higher than the upper end of the hole 15. As an example, the leakage outlet 35d has an elliptical shape. For example, the leakage outlet 35d has a shape in which the rod-shaped portion 35b extending diagonally upward from the hole 15 is cut by a plane extending in the horizontal direction. In this case, the leakage outlet 35d faces vertically upward and has an elliptical shape. However, the leakage outlet 35d may face diagonally upward, and the direction and shape of the leakage outlet 35d are not particularly limited.

As described above, in the third embodiment, the leakage outlet 35d is formed at a position higher than the upper end of the hole 15. Therefore, by positioning the leakage outlet 35d higher than the upper end of the hole 15, the time for which the concrete C is stored in the storage section 35 can be extended. Therefore, material separation of the concrete C leaking from the leakage outlet 35d into the concrete pouring space S can be more reliably suppressed.

Fourth Embodiment
Next, a concrete pouring piping according to a fourth embodiment will be described with reference to Fig. 14. As shown in Fig. 14, the concrete pouring piping according to the fourth embodiment includes a plurality of types of pipe bodies 42 having different lengths. The plurality of types of pipe bodies 42 are, for example, a first pipe body 42A and a second pipe body 42B that is shorter than the first pipe body 42A.

The first pipe body 42A has multiple holes 15 in an area located a certain distance above its bottom end, and has no holes 15 outside of that area. The second pipe body 42B, like the first pipe body 42A, has multiple holes 15 in an area located a certain distance above the bottom end of the second pipe body 42B, and has no holes 15 outside of that area.

When the upper end of the second pipe body 42B is aligned with the upper end of the first pipe body 42A, the area in which the holes 15 of the first pipe body 42A are formed and the area in which the holes 15 of the second pipe body 42B are formed are misaligned. According to the concrete pouring piping of the fourth embodiment, the first pipe body 42A can press concrete C around the holes 15, and the second pipe body 42B can press concrete C around the holes 15 and at a different height from the holes 15 of the first pipe body 42A.

Fifth Embodiment
Next, a concrete pouring piping according to a fifth embodiment will be described with reference to Fig. 15. As shown in Fig. 15, the concrete pouring piping according to the fifth embodiment includes a concrete distribution member 51 having a different configuration from the concrete distribution member 11. The concrete distribution member 51 includes a receiving portion 11b, a vibrator 11d, and a plurality of branch portions 51c extending from a lower portion of the receiving portion 11b.

The branch portion 51c has a tubular shape. The branch portion 51c has a leakage outlet 51d from which the concrete C leaks out, located closer to the base than the tip of the branch portion 51c. Since the leakage outlet 51d is formed closer to the base than the tip of the branch portion 51c, the concrete C can be stored at the tip of the branch portion 51c before leaking out from the leakage outlet 51d. Therefore, material separation of the concrete C coming out of the concrete distribution member 51 can be more reliably suppressed.

Sixth Embodiment
Next, a concrete pouring piping according to a sixth embodiment will be described with reference to Fig. 16. As shown in Fig. 16, the concrete pouring piping according to the sixth embodiment includes a pipe body 62 and a sliding member 63 on which the concrete C inside the pipe body 62 is placed. The sliding member 63 slides on 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.

The sliding member 63 is in the shape of a bag filled with gas. The sliding member 63 may be made of an expandable material. The sliding member 63 is made of, for example, resin (rubber as an example). The sliding member 63 in the expanded state is spherical. The diameter of the sliding member 63 in the expanded state is equal to or greater than the inner diameter of the pipe body 62. When the concrete C flows down inside the pipe body 62, the sliding member 63 slides against the inner surface of the pipe body 62 and is pushed downward.

The pipe body 62 has a destruction section 64 that destroys the sliding member 63 at the lower end of the pipe body 62, and a leakage outlet 65 through which the concrete C leaks out. As an example, the destruction section 64 and the leakage outlet 65 are provided in the first concrete reservoir C1 described above. For example, the destruction section 64 has a needle shape. The destruction section 64 pierces the sliding member 63 that has been pushed to the lower end of the pipe body 62, destroying the sliding member 63.

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 destruction section 64 and is destroyed, it leaks out of the pipe body 62 from the leakage outlet 65. Therefore, material separation of the concrete C leaking out of the pipe body 62 is suppressed. The destruction section 64 and the leakage outlet 65 may be provided in at least one of the second concrete reservoir section C2, the third concrete reservoir section C3, and the fourth concrete reservoir section C4.

As described above, the concrete pouring piping according to the sixth embodiment includes a sliding member 63 on which the concrete C is placed inside the pipe body 62 and which slides on 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 accordingly. At this time, the concrete C accumulated on the sliding member 63 moves slowly downward together with the sliding member 63. By accumulating the concrete C on the sliding member 63 in this way, material separation of the concrete C can be more reliably suppressed.

Seventh Embodiment
Next, concrete pouring piping according to the seventh embodiment will be described with reference to Fig. 17. As shown in Fig. 17, the concrete pouring piping according to the seventh embodiment includes a pipe body 72 in which holes 75 different from the holes 15 are formed. The holes 75 have a lattice 73. The lattice 73 has a plurality of first linear members that straddle the holes 75 and extend along a first direction (e.g., the up-down direction in Fig. 17), and a plurality of second linear members that straddle the holes 75 and extend along a second direction different from the first direction (e.g., the left-right direction in Fig. 17).

The lattice 73 may be a metal lath fixed to the inner surface of the pipe body 72, or may be a lattice reinforcing bar. By providing the pipe body 72 with the lattice 73 formed in the hole 75, the speed at which the concrete C leaks out of the pipe body 72 from the hole 75 can be reduced, so that material separation of the concrete C can be more reliably suppressed.

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

The pipe body 82 has a hinge portion 84 fixed to the upper part of the hole 85, and the oscillating member 83 is capable of oscillating around the hinge portion 84. For example, before concrete C is poured into the pipe body 82, the oscillating member 83 extends horizontally. When the concrete C flowing down inside the pipe body 82 comes into contact with the oscillating member 83, the oscillating member 83 moves downward to block 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 speed at which the concrete C leaks out from the hole 85 can be reduced, thereby suppressing material separation of the concrete C.

Various embodiments of the concrete pouring pipe according to the present disclosure have been described above. However, the present disclosure is not limited to the above-mentioned embodiments, and may be further modified within the scope of the gist described in the claims. In other words, the shape, size, material, number, and arrangement of each part of the concrete pouring pipe according to the present disclosure can be appropriately changed within the scope of the above gist. In addition, the first to eighth embodiments have been described above. The concrete pouring pipe according to the present disclosure may be a combination of some of the forms of the first to eighth embodiments and other forms different from the some of the forms of the first to eighth embodiments.

For example, in the above embodiment, 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, and may be two, three, five or more.

For example, in the above embodiment, an example was described in which the structure constructed by the concrete pouring piping 10 was the column 3 of the hybrid float 1. However, the structure constructed by the concrete pouring piping according to the present disclosure is not limited to the column 3 of the hybrid float 1, and may be, for example, the outer column 2 of the hybrid float 1, or a structure other than the hybrid float 1. In this way, the concrete pouring piping according to the present disclosure is applicable to various structures.

1... hybrid floating body, 2... outer column, 3... column, 3b... tower joint, 3c... diaphragm, 3d... flange, 3f... stage, 4... lower hull, 4b... center, 4c... extension, 4d... root, 4f... tip, 4g... first corner, 4h... second corner, 5... outer steel plate, 5b... inner surface, 5c... headed stud, 6... inner steel plate, 6b... outer surface, 6c... headed stud, 7... reinforcing member, 7A... first reinforcing member group, 7B... second auxiliary Group of strong members, 10... concrete pouring pipe, 11... concrete distribution member, 11b... receiving portion, 11c... branching portion, 11d... vibrator, 11f... opening, 11g... bottom surface, 12A... first lift portion, 12B... second lift portion, 12C... third lift portion, 12D... fourth lift portion, 13... opening, 15... hole, 15A... first hole group, 15B... second hole group, 15C... third hole group, 15D... fourth hole group, 17... impact absorbing material, 17b... first reinforcing bar, 17c... Second reinforcing bar, 25...storage section, 25b...expansion section, 25c...constriction section, 25d...leakage outlet, 35...storage section, 35b...rod-shaped section, 35d...leakage outlet, 51...concrete distribution member, 51c...branch section, 51d...leakage outlet, 63...sliding member, 64...destruction section, 65...leakage outlet, 73...lattice, 75...hole, 83...oscillating member, 84...hinge section, 85...hole, A...site, B...pump vehicle, B1...boom, B2...transportation piping, C...concrete, C1...first core Concrete reservoir, C2...second concrete reservoir, C3...third concrete reservoir, C4...fourth concrete reservoir, D1...longitudinal direction, D2...circumferential direction, F1...first lift, F2...second lift, F3...third lift, F4...fourth lift, G...frame, 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 (6)

The pipe body is disposed so as to extend along a vertical direction, and concrete is poured into the pipe body through an opening formed at an upper end thereof;
The pipe body has a plurality of holes formed therein aligned along the longitudinal direction of the pipe body,
The pipe body has a first lift portion that is a region from a lower end of the pipe body to a first height, and a second lift portion that is a region from the first height to a second height higher than the first height,
A first pour is performed in which the concrete is poured from the hole formed in the first lift portion of the pipe body to the first height, and a second pour is performed in which the concrete is poured from the hole formed in the second lift portion of the pipe body to the second height a day after the first pour,
a distance from a hole located at the bottom of the second lift portion among the plurality of holes to a first boundary portion between the first lift portion and the second lift portion is longer than a distance from a hole located at the top of the first lift portion among the plurality of holes to the first boundary portion;
Concrete pouring piping. The pipe body further includes a third lift portion which is a region from the second height to a third height higher than the second height,
A third pour is performed in which the concrete is poured from the hole formed in the third lift portion of the pipe body a day after the second pour, and the concrete is poured to the third height.
a distance from a hole located at the bottom of the third lift portion among the plurality of holes to a second boundary portion between the second lift portion and the third lift portion is longer than a distance from a hole located at the top of the second lift portion among the plurality of holes to the second boundary portion;
The concrete poured piping according to claim 1. The pipe body has a storage portion that protrudes from the periphery of 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 leakage outlet through which the stored concrete leaks out.
3. The concrete poured piping according to claim 1 or 2. The leakage port is formed at a position higher than the upper end of the hole.
The concrete poured piping according to claim 3. A sliding member is provided on which the concrete is placed inside the pipe body and which slides on the inner surface of the pipe body as the concrete flows down inside the pipe body.
3. The concrete poured piping according to claim 1 or 2. A plurality of the tube bodies;
a concrete distribution member having a receiving portion for receiving the concrete and a plurality of branch portions extending from the receiving portion to the openings of each of the plurality of pipe bodies;
Equipped with
3. The concrete poured piping according to claim 1 or 2.

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