Form for placing concrete

Abstract

To provide a concrete placing form capable of reducing labor for cleaning the form, without widely scattering concrete on a surface of the form, when taking in and out a concrete compacting tool.SOLUTION: The upper form plate 2 has a plurality of circular through-holes 22, and has a scattering preventive wall 220 for preventing scattering of concrete erected by surrounding the circular through-hole 22 with every circular through-hole 22. Alternatively, the upper form plate 2 has a reinforcing rib 21 and a plurality of circular through-holes 22, and is provided with a scattering preventive wall 220 for preventing scattering of concrete erected by surrounding the circular through-holes 22 separately from the reinforcing rib 21.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a concrete pouring formwork used for pouring concrete while compacting it with a concrete compaction tool such as a vibrator. [Background technology]

[0002] To obtain high-quality concrete products, it is necessary to fill the concrete inside the formwork without leaving any gaps when pouring the concrete. In particular, heavy concrete and ultra-high strength concrete containing silica fume, reinforcing fibers, etc. (for example, Patent Document 1) tend to have low fluidity, so the concrete is compacted using compaction tools such as vibrators.

[0003] In order to pour concrete using a compaction tool, for example, Patent Document 2 discloses a formwork for producing concrete segments, which includes circumferential end face formwork plates for forming the circumferential end faces of segments of tunnel lining material constructed using the shield method, axial end face formwork plates for forming the axial end faces, inner circumferential face formwork plates for forming the inner circumferential face, and outer circumferential face formwork plates for forming the outer circumferential face, with an injection port for injecting concrete provided in the center of the outer circumferential face formwork plates and multiple openings provided at the edges of the outer circumferential face formwork plates through which air bubble removers can be inserted.

[0004] In such forms, an air bubble remover is inserted through the opening and vibrated with a vibration generator or pulled out by shaking it up and down, thereby removing air from within the concrete and preventing pitting from forming on the surface of the concrete. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 7381623 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-201915 Summary of the Invention [Problem to be solved by the invention]

[0006] In a concrete pouring formwork such as that described in Patent Document 1, when the air bubble remover is pulled out from the opening, the adhering concrete may spill out and soil the surface of the formwork. Conventionally, when removing the concrete from the formwork, it was necessary to clean the formwork that had become soiled with concrete, but this work was time-consuming and burdensome.

[0007] The problem that the present invention aims to solve is to provide a formwork for pouring concrete that is less likely to scatter concrete over the surface of the formwork when a concrete compaction tool is inserted or removed, thereby reducing the effort required to clean the formwork. [Means for solving the problem]

[0008] The invention of claim 1 is a formwork for concrete pouring used in the manufacture of ultra-high-strength reinforced concrete segments containing silica fume, and comprising a formwork plate having a plurality of through holes, wherein the formwork plate is provided with anti-scattering walls erected around each of the plurality of through holes to prevent concrete from scattering.

[0009] The invention of claim 2 is a formwork for pouring concrete comprising a formwork plate having a plurality of through holes, wherein the formwork plate is provided with anti-scattering walls erected around each of the plurality of through holes to prevent concrete from scattering.

[0010] The invention of claim 3 is a formwork for pouring concrete comprising an upper formwork plate having a plurality of through holes, wherein the upper formwork plate is provided with anti-scattering walls erected around each of the plurality of through holes to prevent concrete from scattering.

[0011] The invention of claim 4 is a formwork for concrete pouring used for manufacturing ultra-high strength reinforced concrete segments containing silica fume, and comprising a formwork plate having reinforcing ribs and a plurality of through holes, wherein the formwork plate is characterized in that, in addition to the reinforcing ribs, it is also provided with a scattering prevention wall that is erected around the through holes to prevent concrete from scattering.

[0012] The invention of claim 5 is a formwork for pouring concrete comprising a formwork plate having reinforcing ribs and a plurality of through holes, wherein the formwork plate is characterized in that it is provided with a scattering prevention wall that is erected around the through holes and prevents concrete from scattering, separate from the reinforcing ribs.

[0013] The invention of claim 6 is a formwork for pouring concrete comprising an upper formwork plate having reinforcing ribs and a plurality of through holes, wherein the upper formwork plate is characterized in that it is provided with a scattering prevention wall that is erected around the through holes and prevents concrete from scattering, separate from the reinforcing ribs.

[0014] The invention according to claim 7 is a formwork for pouring concrete according to any one of claims 4 to 6, characterized in that the anti-scattering wall is lower in height than the reinforcing rib.

[0015] The invention of claim 8 is a formwork for concrete pouring described in any of claims 1 to 6, characterized in that the anti-scattering wall has a scraper on the top, and the scraper removes concrete adhering to a concrete compaction tool that is inserted and removed through the through hole.

[0016] The invention of claim 9 is a formwork for pouring concrete described in any of claims 1 to 6, characterized in that the anti-scattering wall has a sloping shape that moves away from the surrounding through hole as it goes upward.

[0017] The invention according to claim 10 is the formwork for pouring concrete according to claim 9, characterized in that the lower end of the anti-scattering wall is provided without being spaced apart from the periphery of the through-hole.

[0018] The invention of claim 11 is a formwork for pouring concrete described in any one of claims 1 to 6, characterized in that the anti-scattering wall is formed from a flexible elastic material. [Effects of the Invention]

[0019] According to the present invention, when a concrete compaction tool is pulled out of a through hole in the upper formwork plate, even if concrete adheres to the concrete compaction tool and escapes from the through hole, or if concrete drips from the pulled out concrete compaction tool, the concrete is blocked by the anti-scattering wall surrounding the through hole, making it less likely to scatter beyond the anti-scattering wall, reducing the amount of concrete that gets on the top surface of the upper formwork plate and reducing the burden required for cleaning the formwork. In particular, in the case of ultra-high strength concrete containing silica fume, reinforcing fibers, etc., which has low fluidity and requires compaction using concrete compaction tools, and which tends to adhere to the concrete compaction tools, the effect of suppressing contamination of the upper formwork plate is significant.

[0020] In addition, by providing a scraper on the top of the anti-scattering wall to remove concrete that has adhered to the concrete compaction tool that is inserted and removed through the through-hole, the scraper will come into close contact with the pulled-out concrete compaction tool and remove the adhering concrete, thereby further reliably preventing concrete from scattering.

[0021] In addition, by sloping the anti-scattering wall upwards, it can cover a wide area of ​​the upper surface of the upper formwork plate, preventing contamination caused by scattered concrete. It also serves as a guide when inserting concrete compaction tools into the through-holes, improving workability.

[0022] In addition, because the anti-scattering wall is made of a flexible elastic material, when a worker trips over it, the wall bends and deforms, making it less likely for the worker to fall and less likely to be injured in the event of a collision, making it safer than reinforcing ribs made of steel as a structural material. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a plan view of a concrete pouring formwork showing a first embodiment of the present invention. [Figure 2] 1 is an axial cross-sectional view of a concrete pouring formwork showing a first embodiment of the present invention when a rod-shaped concrete compaction tool is in use. [Figure 3] 1 is a circumferential cross-sectional view of a concrete pouring formwork showing a first embodiment of the present invention when a rod-shaped concrete compaction tool is in use. [Figure 4] 1 is an enlarged cross-sectional view of a main portion of a concrete pouring formwork according to a first embodiment of the present invention when a rod-shaped concrete compaction tool is in use. [Figure 5] 1 is an axial cross-sectional view of a concrete pouring formwork showing a first embodiment of the present invention when a plate-shaped concrete compaction tool is in use. [Figure 6] 1 is a circumferential cross-sectional view of a concrete pouring formwork according to a first embodiment of the present invention when a plate-shaped concrete compaction tool is in use. [Figure 7] 1 is an enlarged cross-sectional view of a main portion of a concrete pouring formwork according to a first embodiment of the present invention when a plate-shaped concrete compaction tool is in use. [Figure 8] FIG. 4 is a plan view of a concrete pouring formwork showing a second embodiment of the present invention. [Figure 9] FIG. 10 is an axial cross-sectional view of a concrete pouring formwork according to a third embodiment of the present invention. [Figure 10] FIG. 10 is a circumferential cross-sectional view of a concrete pouring formwork showing a third embodiment of the present invention. [Figure 11] FIG. 10 is an enlarged cross-sectional view of a main part of a concrete pouring formwork showing a third embodiment of the present invention. [Figure 12] FIG. 10 is a perspective view of a scraper according to a third embodiment of the present invention. [Figure 13] FIG. 10 is an axial cross-sectional view of a concrete pouring formwork showing a fourth embodiment of the present invention. [Figure 14] FIG. 10 is an enlarged cross-sectional view of a main part of a concrete pouring formwork showing a fourth embodiment of the present invention. [Figure 15] FIG. 10 is a perspective view of a scraper according to a fourth embodiment of the present invention. [Figure 16] FIG. 10 is an enlarged cross-sectional view of a main part of a concrete pouring formwork according to a fifth embodiment of the present invention. [Figure 17] FIG. 10 is an enlarged cross-sectional view of a main part of a concrete pouring formwork according to a sixth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0024] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, etc. It should be noted that the present invention is not limited to the embodiments.

[0025] [First embodiment] A first embodiment of the present invention will be described below with reference to FIGS.

[0026] Figure 1 is a plan view of a concrete pouring formwork, Figure 2 is an axial cross-sectional view of the concrete pouring formwork when a rod-shaped concrete compactor is used, Figure 3 is a circumferential cross-sectional view of the concrete pouring formwork when a rod-shaped concrete compactor is used, Figure 4 is an enlarged cross-sectional view of key parts of the concrete pouring formwork when a rod-shaped concrete compactor is used, Figure 5 is an axial cross-sectional view of the concrete pouring formwork when a plate-shaped concrete compactor is used, Figure 6 is a circumferential cross-sectional view of the concrete pouring formwork when a plate-shaped concrete compactor is used, and Figure 7 is an enlarged cross-sectional view of key parts of the concrete pouring formwork when a plate-shaped concrete compactor is used.

[0027] In the first embodiment, the concrete pouring formwork 1 is used for pouring concrete into concrete segments of a tunnel lining constructed by the shield tunneling method. The concrete that makes up the segments is ultra-high strength concrete, and as a raw material, powdered silica fume is added to cement in an amount of more than 10% of its weight, and coarse aggregate (gravel), fine aggregate (sand), reinforcing fiber, expansion agent, admixture, etc. are also mixed. Ultra-high strength concrete, which contains silica fume, has a design standard strength of, for example, 80 N / mm 2 ~120N / mm 2 This refers to reinforced concrete to this extent.

[0028] As shown in Figures 1, 2, 3, 5 and 6, the concrete pouring formwork 1 is a so-called steel formwork that includes an upper formwork plate 2 that forms the outer peripheral surface of the concrete segment, a lower formwork plate 3 that forms the inner peripheral surface, axial end formwork plates 4 that form both end faces in the axial direction (tunnel axis direction), and circumferential end formwork plates 5 that form both end faces in the circumferential direction (tunnel circumferential direction).

[0029] A concrete pouring space 10 is formed, which is an internal space surrounded by the upper formwork plate 2, the lower formwork plate 3, the axial end face formwork plate 4, and the circumferential end face formwork plate 5, and concrete is poured into it.

[0030] Legs (not shown) are formed below the lower formwork plate 3, and the lower formwork plate 3 is placed on the ground.

[0031] An inter-ring joint (not shown) is attached to the axial end face form plate 4 and is embedded in concrete.

[0032] A female joint T1 of the inter-piece joint is attached to one of the circumferential end face form plates 5, and a male joint T2 of the inter-piece joint is attached to the other, and the plates are then embedded in concrete (Figs. 3 and 6).

[0033] The upper formwork plate 2 has a concrete injection port 20, a reinforcing rib 21, a circular through-hole 22, and a slit-shaped through-hole 23.

[0034] The concrete injection port 20 is a rectangular opening formed across the highest position in the center of the upper formwork plate 2, and is used to inject or pour concrete to pour it into the concrete pouring space 10.

[0035] A guide plate 200 is provided on the upper peripheral surface of the concrete pouring port 20, sloping downward to gradually reduce in diameter, to guide pouring tools such as chutes and the concrete to be poured into the concrete pouring port 20.

[0036] The reinforcing ribs 21 are erected on the upper surface of the upper formwork plate 2, including at least the peripheral edge, in a grid pattern at appropriate intervals along the circumferential and axial directions, in order to prevent deformation of the shape of the upper formwork plate 2, such as bending, when a load is applied during concrete pouring, etc.

[0037] One circular through hole 22 is formed in each section surrounded by the circumferential and axial reinforcing ribs 21 or the concrete injection port 20. It is not necessary to form one circular through hole 22 in each section, but rather multiple circular through holes 22 may be formed in each section, or there may be sections where no circular through hole 22 exists.

[0038] As shown in FIGS. 2 to 4, a concrete compaction tool A having a round rod-shaped insertion portion a is inserted into and removed from the circular through-hole 22.

[0039] In addition to the reinforcing ribs 21, cylindrical scattering prevention walls 220 are provided vertically on the outer peripheral surface (top surface) of the upper formwork plate 2, surrounding the periphery of each circular through-hole 22. That is, in addition to the reinforcing ribs 21, the upper formwork plate 2 is provided with scattering prevention walls 220 on its outer peripheral surface for each circular through-hole 22.

[0040] The scattering prevention wall 220 is circular in plan view, has an inner diameter slightly larger than the diameter of the circular through-hole 22, and is cylindrical and provided along the periphery of the circular through-hole 22. The scattering prevention wall 220 is erected at a predetermined distance (for example, a constant distance of about 5 cm) from the periphery of the circular through-hole 22. It is also desirable that the height of the scatter prevention wall 220 be the same as or slightly lower than the reinforcing rib 21. By making the height of the scatter prevention wall 220 lower than the reinforcing rib 21, it is possible to prevent workers from tripping over their feet during work. Furthermore, to prioritize further improving the scatter prevention effect, the height of the scatter prevention wall 220 may be made as high as possible, for example, higher than the reinforcing rib 21.

[0041] The distance and height of the anti-scattering wall 220 from the periphery of the circular through-hole 22 are set taking into consideration the fact that when the concrete compaction tool A is pulled out of the circular through-hole 22, concrete (including, for example, slag and mortar) that escapes from the circular through-hole 22 or drips from the concrete compaction tool A is limited as much as possible to the inner area surrounded by the anti-scattering wall 220, the ease of construction and safety when pouring the concrete, and the efficiency of cleaning the formwork after pouring the concrete.

[0042] The anti-scattering wall 220 has the function of preventing concrete and other materials (including, for example, cement paste and mortar) from scattering to the outside, and does not reinforce the upper formwork plate 2 like the reinforcing rib 21, nor is it considered as a structural material in terms of design.

[0043] The slit-shaped through holes 23 are formed along the circumferential direction between the reinforcing ribs 21 along the axial direction, slightly inside the axial end face form plate 4 of the upper form plate 2. The slit-shaped through holes 23 do not have to be formed one by one in each section between the reinforcing ribs 21 along the axial direction, and multiple slit-shaped through holes 23 may be formed in each section, or there may be sections where no slit-shaped through holes 23 exist.

[0044] As shown in FIGS. 5 to 7, a concrete compaction tool B having a thin plate-like insertion portion b with a predetermined width is inserted into and removed from the slit-shaped through-hole 23.

[0045] Separate from the reinforcing ribs 21, scattering prevention walls 230, rectangular in plan view, are provided vertically on the outer peripheral surface (top surface) of the upper formwork plate 2, surrounding the periphery of each slit-shaped through-hole 23. That is, separate from the reinforcing ribs 21, the upper formwork plate 2 is provided with scattering prevention walls 230 on its outer peripheral surface for each slit-shaped through-hole 23.

[0046] The scattering prevention wall 230 has an inner space slightly larger than the outer shape of the slit-shaped through-hole 23, and is a rectangular cylindrical shape in a plan view that is provided along the periphery of the slit-shaped through-hole 23. The scattering prevention wall 230 is erected at a predetermined distance (for example, a constant distance of about 4 cm) from the periphery of the slit-shaped through-hole 23. It is also desirable that the height of the scatter prevention wall 230 be the same as or slightly lower than the reinforcing rib 21. By making the height of the scatter prevention wall 230 lower than the reinforcing rib 21, it is possible to prevent workers from tripping over their feet during work. Furthermore, to prioritize further improving the scatter prevention effect, the height of the scatter prevention wall 230 may be made as high as possible, for example, higher than the reinforcing rib 21.

[0047] The distance and height of the anti-scattering wall 230 from the periphery of the slit-shaped through hole 23 are set taking into consideration the fact that when the concrete compaction tool B is pulled out of the slit-shaped through hole 23, concrete (including, for example, sludge and mortar) that escapes from the slit-shaped through hole 23 or drips from the concrete compaction tool B is limited as much as possible to the inner area surrounded by the anti-scattering wall 230, the ease of construction and safety when pouring the concrete, and the efficiency of cleaning the formwork after pouring the concrete.

[0048] The anti-scattering wall 230 has the function of preventing concrete and other materials (including, for example, cement paste and mortar) from scattering to the outside, and does not reinforce the upper formwork plate 2 like the reinforcing rib 21, nor is it considered as a structural material in its design.

[0049] When concrete is poured into the concrete pouring space 10 of the concrete pouring formwork 1, the concrete is poured or charged through the concrete pouring port 20 of the upper formwork plate 2.

[0050] As concrete is poured or poured, the insertion part a of concrete compaction tool A is inserted into the circular through-hole 22, and the insertion part b of concrete compaction tool B is inserted into the slit-shaped through-hole 23, and the insertion parts a and b are vibrated by a vibration excitation device to compact the concrete filled in the concrete pouring space 10.

[0051] Concrete compaction tool A fills most of concrete pouring space 10 with concrete without leaving any gaps, and concrete compaction tool B fills concrete particularly in the area in contact with the inner surface of axial end formwork plate 4 without leaving any gaps.

[0052] 2 to 7 show that multiple concrete compaction tools A and B are inserted simultaneously into all of the circular through-holes 22 and slit-shaped through-holes 23 to perform compaction, but it is not essential to use multiple concrete compaction tools simultaneously. For example, it is possible to use one concrete compaction tool A sequentially for multiple circular through-holes 22 to perform compaction work, and it is also possible to use one concrete compaction tool B sequentially for multiple slit-shaped through-holes 23 to perform compaction work.

[0053] Once the compaction work for the inserted portion is completed, concrete compaction tool A is pulled out upward from the circular through-hole 22, and concrete compaction tool B is pulled out upward from the slit-shaped through-hole 23. Furthermore, for the portion that has not yet been compacted, the pulled out concrete compaction tool A is inserted into the circular through-hole 22, and concrete compaction tool B is inserted into the slit-shaped through-hole 23.

[0054] In this case, even if concrete adheres to the concrete compaction tools A and B and escapes through the circular through-holes 22 and the slit-shaped through-holes 23, or even if concrete drips from the pulled-out concrete compaction tools A and B, the concrete is blocked by the anti-scattering walls 220 and 230 surrounding the circular through-holes 22 and the slit-shaped through-holes 23, making it difficult for the concrete to scatter beyond the anti-scattering walls 220 and 230, thereby preventing the upper surface of the upper formwork plate 2 from being soiled with concrete over a wide area and reducing the burden required for cleaning the formwork. In particular, in the case of ultra-high strength concrete containing silica fume, reinforcing fibers, etc., which has low fluidity and requires compaction using concrete compaction tools A and B, and which tends to adhere to concrete compaction tools A and B, suppressing contamination of the upper formwork plate 2 is highly effective.

[0055] Second Embodiment A second embodiment of the present invention will be described below with reference to FIG. Note that a description of the same parts as in the first embodiment will be omitted, and the differences will be mainly described.

[0056] In the second embodiment, in addition to the reinforcing ribs 21, a square-shaped anti-scattering wall 220 in plan view is erected on the outer peripheral surface (upper surface) of the upper formwork plate 2, surrounding each circular through hole 22. Each side of the scattering prevention wall 220 is parallel to the reinforcing rib 21, and the length of each side is slightly longer than the diameter of the circular through-hole 22, and they are spaced apart.

[0057] Third Embodiment A third embodiment of the present invention will be described below with reference to FIGS. Note that a description of the same parts as those in the first and second embodiments will be omitted, and the differences will be mainly described.

[0058] The third embodiment differs from the first embodiment in that a cylindrical scattering prevention wall 220 has a scraper 221 on the inner circumferential side.

[0059] The scraper 221 is made of a flexible synthetic resin or the like, and has an inverted cone shape that gradually increases in diameter toward the top, with multiple slits 2210 formed radially upward from the apex at the bottom end (FIG. 12).

[0060] The diameter of the upper end of the scraper 221 is approximately equal to the diameter of the scattering prevention wall 220, and the upper edge of the scraper 221 is fixed to the upper end of the scattering prevention wall 220. The apex of the inverted cone shape of the scraper 221 is located directly above the circular through-hole 22.

[0061] When the insertion part a of the concrete compaction tool A is inserted from above the scraper 221 in the cylindrical anti-scattering wall 220 , the slit 2210 of the scraper 221 is pushed open and the insertion part a is inserted into the circular through-hole 22 .

[0062] The scraper 221 guides the concrete compaction tool A into the circular through-hole 22, making it easier to insert the concrete compaction tool A into the circular through-hole 22.

[0063] When compaction by the concrete compaction tool A is completed and the insertion part a is pulled out upward, the scraper 221 adheres to the outer surface of the insertion part a and removes the concrete adhering to the insertion part a, thereby further reliably preventing concrete from scattering.

[0064] Even when a scraper 221 is provided, it is attached to the anti-scattering wall 220 and positioned above the circular through-hole 22, so that the scraper 221 does not interfere with the concrete pouring space 10, and the scraper 221 can be formed into an inverted cone shape, i.e., an inverted tapered shape, with the diameter gradually increasing upward, thereby further enhancing its function of removing concrete.

[0065] Even when a scraper 221 is provided, it is attached to the scattering prevention wall 220 and positioned above the circular through-hole 22, so the scraper 221 does not interfere with the concrete pouring space 10 and does not come into contact with the concrete filled in the concrete pouring space 10 to disturb the finished surface, so that work efficiency can be improved even when the upper formwork plate 2 is removed to perform trowel work, etc.

[0066] Even when the scraper 221 is provided, it is attached to the scattering prevention wall 220 and positioned above the circular through-hole 22, so the scraper 221 does not hinder the air contained in the concrete from escaping through the circular through-hole 22 when concrete is poured.

[0067] [Fourth embodiment] A fourth embodiment of the present invention will be described below with reference to FIGS. Note that a description of the same parts as those in the first to third embodiments will be omitted, and the following mainly describes the different parts.

[0068] The fourth embodiment differs from the first embodiment in that a scattering prevention wall 230 in the shape of a rectangular cylinder in a plan view has a scraper 231 on the inner circumferential side.

[0069] The scraper 231 has approximately the same length as the side wall 2300 along the longitudinal direction of the scattering prevention wall 230, and is composed of a pair of inclined plates 2310 attached downward from the upper end of the side wall 2300 (FIG. 15). The upper ends of the inclined plates 2310 are fixed to the upper ends of the side walls 2300.

[0070] The pair of inclined plates 2310 are made of a flexible synthetic resin or the like, and are arranged with a wide gap between their upper ends and their lower ends touching. The lower ends of the pair of inclined plates 2310 of the scraper 221 are located directly above the slit-shaped through-hole 23.

[0071] When the insertion part b of the concrete compaction tool B is inserted from above the scraper 231 in the square cylindrical scattering prevention wall 230, the pair of inclined plates 2310 are pushed apart and the insertion part b is inserted into the slit-shaped through-hole 23.

[0072] The scraper 231 guides the concrete compaction tool B into the slit-shaped through-hole 23, making it easier to insert the concrete compaction tool B into the slit-shaped through-hole 23.

[0073] When compaction by the concrete compaction tool B is completed and the insertion part b is pulled out upward, the scraper 231 adheres to the outer surface of the insertion part b and removes the concrete adhering to the insertion part b, thereby further reliably preventing concrete from scattering.

[0074] Even when a scraper 231 is provided, it is attached to the anti-scattering wall 230 and positioned above the slit-shaped through-hole 23, so that the scraper 231 does not interfere with the concrete pouring space 10, and the scraper 231 can be formed in a shape in which the inclined plates 2310 gradually move away from each other upward, i.e., in an inverted tapered shape, thereby further enhancing the concrete removal function.

[0075] Even when a scraper 231 is provided, it is attached to the scattering prevention wall 230 and positioned above the slit-shaped through-hole 23, so the scraper 231 does not interfere with the concrete pouring space 10 and does not come into contact with the concrete filled in the concrete pouring space 10 to disturb the finished surface, so that work efficiency can be improved even when the upper formwork plate 2 is removed to perform trowel work, etc.

[0076] Even when a scraper 231 is provided, it is attached to the scattering prevention wall 230 and positioned above the slit-shaped through-hole 23, so the scraper 231 does not hinder the air contained in the concrete from escaping through the slit-shaped through-hole 23 when concrete is poured.

[0077] Fifth Embodiment The fifth embodiment of the present invention will be described below with reference to FIG. Note that a description of the same parts as those in the first to fourth embodiments will be omitted, and the following mainly describes the different parts.

[0078] The fifth embodiment differs from the first embodiment in that the anti-scattering wall 220 surrounding the circular through-hole 22 has an inclined shape that moves away from the surrounding circular through-hole 22 as it goes upward.

[0079] In addition, in order to further enhance the scattering prevention effect, the scattering prevention wall 220 is formed higher than the reinforcing rib 21. The height of the scattering prevention wall 230 may be made lower than the reinforcing rib 21 to prevent workers from tripping over the feet during work.

[0080] When compaction by the concrete compacting tool A is completed and the insertion part a is pulled upward from the circular through-hole 22, even if the concrete escapes together with the insertion part a, the lower end of the scattering prevention wall 220 is close to the circular through-hole 22, so the area where the concrete that has fallen from the insertion part a may adhere is narrow, and the scattering prevention wall 220 that gradually widens upward covers a wide area, suppressing contamination of the outer peripheral surface of the upper formwork plate 2 due to scattering of concrete.

[0081] The scattering prevention wall 220 is inclined so as to move away from the surrounding circular through-hole 22 as it approaches the top, and the concrete compaction tool A is guided to the vicinity of the circular through-hole 22, making it easier to insert the concrete compaction tool A into the circular through-hole 22.

[0082] Sixth Embodiment A sixth embodiment of the present invention will be described below with reference to FIG. Note that a description of the same parts as those in the first to fifth embodiments will be omitted, and the following mainly describes the different parts.

[0083] The sixth embodiment differs from the fifth embodiment in that the lower end of the scattering prevention wall 220 surrounding the circular through-hole 22 is not spaced apart from the periphery of the circular through-hole 22. The inclination angle of the scatter prevention wall 220 relative to the horizontal plane is smaller than that of the scatter prevention wall 220 of the fifth embodiment. That is, the inclination of the scatter prevention wall 220 of this embodiment is gentler than that of the fifth embodiment.

[0084] The lower end is provided close to the periphery of the circular through-hole 22, and the scattering prevention wall 220 is inclined so as to move away from the surrounding circular through-hole 22 as it approaches the upper part, thereby guiding the concrete compaction tool A into the circular through-hole 22, making it even easier to insert the concrete compaction tool A into the circular through-hole 22.

[0085] [Other Modifications] The present invention is not limited to the above-described embodiment, and may also include the following, for example.

[0086] In this embodiment, the insertion part of the concrete compaction tool is vibrated by a vibration exciter, but it may also be compacted by manually shaking it.

[0087] In the embodiment of the present application, a circular through hole is formed in a section surrounded by a circumferential reinforcing rib and an axial reinforcing rib, but the through hole may have a shape other than circular, for example, rectangular.

[0088] In the third embodiment, the scraper has an inverted cone shape, that is, a tapered shape, but a plurality of cuts may be formed radially from the center of a disk-shaped scraper when viewed as a whole.

[0089] In the fourth embodiment, the scraper is made up of a pair of inclined plates that are tapered so that they slope away from the through hole as they go upward, but it may also be formed as a flat plate when viewed overall, divided into two by a straight cut.

[0090] In the fifth embodiment, the anti-scattering wall surrounding the circular through hole is inclined so that it moves away from the through hole as it goes upward, but the anti-scattering wall surrounding the slit-shaped through hole may also be inclined so that it moves away from the through hole as it goes upward. Also, a disk-shaped scraper can be attached to the upper end of a scattering prevention wall that surrounds the circular through-hole and is inclined so as to move away from the through-hole as it approaches the upper part. Furthermore, a pair of plate-like scrapers can be attached to the upper end of a scattering prevention wall that surrounds the slit-like through-hole and is inclined so as to move away from the through-hole as it approaches the upper part.

[0091] In this embodiment, it is assumed that the shatter prevention wall is made of steel and attached to the upper formwork plate by welding, but this is not limiting. The shatter prevention wall may be made of synthetic resin and attached to the upper formwork plate by appropriate means such as bolts or adhesive. The shatter prevention wall may also be made of a flexible elastic material. In this case, workers may stand on the upper formwork plate during concrete pouring work. If a worker trips over the shatter prevention wall, the wall will bend and deform, making it less likely for the worker to fall and less likely to be injured in the event of a collision. This provides greater safety than reinforcing ribs made of steel as structural materials. This is particularly effective when the shatter prevention wall is placed higher than the reinforcing ribs.

[0092] In this embodiment, the form plate having the through-hole for inserting and removing the compaction tool and the scattering prevention wall surrounding the through-hole is the upper form plate, but this is not limited to this. For example, a side form plate such as an axial end form plate or a circumferential end form plate may have a through-hole and a scattering prevention wall surrounding the through-hole, which will similarly provide a scattering prevention effect. In this case, the portion of the scattering prevention wall away from the axial end form plate or the circumferential end form plate corresponds to the upper part of the scattering prevention wall of the present invention.

[0093] In this embodiment, the present invention is applied to the formwork of ultra-high strength reinforced concrete segments containing silica fume, but the present invention is not limited to this. It may also be applied to normal strength concrete segments that do not contain silica fume, or to concrete products other than segments.

[0094] The technical matters in the embodiments including the modified examples may be combined and applied to other embodiments to form examples. [Explanation of symbols]

[0095] 1. Formwork for concrete pouring 2 Upper formwork board 20 Concrete pouring port 200 Guide Plate 21 Reinforcing rib 22 Circular through-hole 220 Shatterproof wall 221 Scraper 2210 Break 23 Slit-shaped through-hole 230 Shatterproof wall 2300 side wall 231 Scraper 2310 Inclined plate 3 Lower formwork board 4 Axial end formwork plate 5 Circumferential end formwork plate 10 Concrete pouring space A, B Concrete compaction tool a,b Insertion section T1 female fitting T2 male fitting

Claims

1. A concrete pouring formwork used to manufacture ultra-high strength reinforced concrete segments containing silica fume, the formwork comprising a formwork plate having a plurality of through holes, The formwork plate includes a scattering prevention wall surrounding each of the plurality of through holes to prevent concrete from scattering. A formwork for pouring concrete characterized by:

2. A concrete pouring formwork having a formwork plate with a plurality of through holes, The formwork plate includes a scattering prevention wall surrounding each of the plurality of through holes to prevent concrete from scattering. A formwork for pouring concrete characterized by:

3. A concrete pouring formwork having an upper formwork plate having a plurality of through holes, The upper formwork plate is provided with a scattering prevention wall surrounding each of the plurality of through holes to prevent concrete from scattering. A formwork for pouring concrete characterized by:

4. A concrete pouring formwork used for manufacturing an ultra-high strength reinforced concrete segment containing silica fume, the formwork comprising a formwork plate having a reinforcing rib and a plurality of through holes, The formwork plate includes a scattering prevention wall that is erected around the through hole and prevents scattering of concrete, in addition to the reinforcing rib. A formwork for pouring concrete characterized by:

5. A concrete pouring formwork including a formwork plate having a reinforcing rib and a plurality of through holes, The formwork plate includes a scattering prevention wall that is erected around the through hole and prevents scattering of concrete, in addition to the reinforcing rib. A formwork for pouring concrete characterized by:

6. A concrete pouring formwork having an upper formwork plate having a reinforcing rib and a plurality of through holes, The upper formwork plate is provided with a scattering prevention wall that is erected around the through hole in addition to the reinforcing rib to prevent scattering of concrete. A formwork for pouring concrete characterized by:

7. The scattering prevention wall is lower in height than the reinforcing rib.

7. A formwork for concrete pouring according to any one of claims 4 to 6.

8. The scattering prevention wall has a scraper on an upper portion thereof, The scraper removes concrete adhering to the concrete compaction tool that is inserted into and removed from the through-hole.

7. A formwork for pouring concrete according to any one of claims 1 to 6.

9. The scattering prevention wall has an inclined shape so that it gets farther away from the surrounding through-hole as it goes to the top.

7. A formwork for pouring concrete according to any one of claims 1 to 6.

10. The lower end of the scattering prevention wall is provided without being spaced apart from the periphery of the through hole.

10. A formwork for concrete pouring according to claim 9.

11. The scattering prevention wall is formed of a flexible elastic body.

7. A formwork for pouring concrete according to any one of claims 1 to 6.

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