Perforated tube structure and method for manufacturing the same

Abstract

To provide a perforated tube structure that can omit reinforcement materials and can secure strength necessary to the structure, and to provide a manufacturing method of the perforated tube structure that can simply and easily detect an anomaly in concrete filling.SOLUTION: A manufacturing method of a perforated tube structure 1 used in construction of a structure includes a tube preparation step of preparing tubes 20 with holes, a concrete filling step of filling fresh concrete into the tubes 20, a redundant water discharge step of filling the holes with concrete in a state in which the inside is visible through the holes so as to stop fluidization and temporarily solidify concrete by squeezing redundant water unnecessary to hardening out using the weight of the concrete, and a concrete hardening step of integrally hardening concrete with the tube by digging temporarily solidified concrete into the holes.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a perforated tube structure and a method for manufacturing the same.

Background Art

[0002] As a tube structure used in high-rise buildings and the like, a CFT (Concrete Filled steel Tube) in which concrete is filled in a tubular steel pipe is known. Usually, CFT is used only for the column part of a building and is used in combination with a steel frame structure (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, although the conventionally used CFT has relatively high strength, it requires reinforcement at the joints with the steel frame structure, and there are problems such as complicated processing of internal diaphragms and the increase in the processing cost of steel. In addition, if the fluidity of the concrete to be filled is not sufficient, blockage may occur during pressure injection, or it may be difficult to fill the steel pipe with concrete evenly to every corner, so expensive high-fluidity concrete is indispensable, which is uneconomical. In addition to this, since CFT fills concrete in a sealed steel pipe, it is difficult to check the state of fresh concrete inside the steel pipe, and there may be cases where abnormalities such as cavities in the fresh concrete cannot be detected. Although it is possible to check the state of fresh concrete inside the steel pipe by using non-destructive inspection, this will take a great deal of time and cost for inspection and repair inside the steel pipe.

[0005] The present invention has been made in view of the above problems, and aims to provide a perforated tube structure that can omit reinforcing materials such as diaphragms, does not require high fluidity in the concrete being filled, and can secure the strength required for the structure. It also aims to provide a method for manufacturing a perforated tube structure that can easily and simply detect abnormalities in fresh concrete during concrete filling. [Means for solving the problem]

[0006] To achieve the above objective, the present invention provides: A method for manufacturing a perforated tube structure used in the construction of a structure, The perforated tube structure comprises a structural body made of concrete, a tube that surrounds the structural body and extends in a predetermined direction to bear the bending stress, tensile stress and shear stress of the structure, and holes formed in the tube that allow the interior to be seen from the outside. A tube preparation step for preparing the aforementioned tube, The concrete filling step involves filling the inside of the tube with fresh concrete, A process to temporarily solidify the concrete by filling the hole with the concrete while the inside can be seen through the hole, and by using the weight of the concrete to squeeze out excess water that is not needed for hardening, thereby stopping the fluidity, A method for manufacturing a perforated tube structure is provided, which includes a concrete hardening step of allowing the concrete, which has been partially solidified after the excess water has been discharged, to bite into the holes and harden integrally with the tube.

[0007] According to this manufacturing method for perforated tube structures, during the excess water discharge process, excess water and air in the concrete are released through the holes in the tube, making it less likely for voids to form in the fresh concrete and improving the density of the concrete. In addition, the filling status of the concrete can be checked from the outside through the holes in the tube. This allows workers to quickly resolve any abnormalities such as voids in the concrete. Furthermore, filling the holes with concrete and integrating the concrete and tubes increases the overall strength of the structure. The improved density of the concrete also contributes to the overall strength of the structure, compensating for any decrease in tube strength caused by the formation of holes. Furthermore, after the concrete has hardened, maintenance work such as injecting, impregnating, or applying repair agents to the concrete can be easily performed through the holes in the tube.

[0008] Furthermore, in the present invention, a perforated tube structure manufactured by the above-described method for manufacturing a perforated tube structure is provided, It has a first structural part extending in a first direction, and a second structural part connected to the first structural part and extending in a second direction, A perforated tube structure is provided in which the tube and concrete of the first and second structural parts are integrally formed.

[0009] This perforated tube structure allows the first and second structural parts to be integrated into a single tube structure, eliminating the need for reinforcement at the joints between the two structural parts, as was the case in conventional designs where one part is made of CFT (concrete-framed tube) and the other a steel frame structure. Furthermore, it eliminates the need for reinforcing materials such as diaphragms inside the tube. Therefore, it is possible to reduce manufacturing costs while ensuring the strength of structures constructed using this perforated tube structure. [Effects of the Invention]

[0010] According to the perforated tube structure of the present invention, reinforcing materials such as diaphragms can be omitted, high fluidity is not required for the concrete being filled, and the necessary strength for the structure can be ensured. Furthermore, according to the method for manufacturing the perforated tube structure of the present invention, abnormalities in the fresh concrete during concrete filling can be easily and quickly detected. [Brief explanation of the drawing]

[0011] [Figure 1]Front explanatory view of a structure constructed by a perforated tube structure showing an embodiment of the present invention. [Figure 2] Partial perspective explanatory view of a perforated tube structure. [Figure 3] Planar cross-sectional explanatory view of a perforated tube structure of a column portion. [Figure 4] Partial development view of a tube. [Figure 5] Flowchart showing a method for manufacturing a perforated tube structure. [Figure 6] Flowchart showing a method for manufacturing a perforated tube structure including a petrified portion. [Figure 7] Flowchart showing a method for maintaining the strength of a perforated tube structure. [Figure 8] Front explanatory view of a structure constructed by a perforated tube structure showing a modified example. [Figure 9] A - A cross-sectional explanatory view of FIG. 8. [Figure 10] Front explanatory view of a structure constructed by a perforated tube structure showing a modified example. [Figure 11] (a) is a B - B cross-sectional explanatory view of FIG. 10, and (b) is a C - C cross-sectional explanatory view of FIG. 10. [Figure 12] Front explanatory view of a structure constructed by a perforated tube structure showing a modified example. [Figure 13] D - D cross-sectional explanatory view of FIG. 12. [Figure 14] Front explanatory view of a structure constructed by a perforated tube structure showing a modified example. [Figure 15] Cross-sectional explanatory view of a perforated tube structure showing a modified example. [Figure 16] Front explanatory view of a structure constructed by a perforated tube structure showing a modified example. [Figure 17] Cross-sectional explanatory view of a perforated tube structure showing a modified example.

[0012] Figures 1 to 7 show a first embodiment of the present invention. Figure 1 is a front view of a structure constructed with a perforated tube structure, Figure 2 is a partial perspective view of the perforated tube structure, Figure 3 is a plan and cross-sectional view of the perforated tube structure, Figure 4 is a partial unfolded view of the tube, Figure 5 is a flowchart showing a method for manufacturing the perforated tube structure, Figure 6 is a flowchart showing a method for manufacturing the perforated tube structure including the petrified portion, and Figure 7 is a flowchart showing a method for maintaining the strength of the perforated tube structure.

[0013] As shown in Figure 1, the structure 100 constructed using the perforated tube structure 1 (see Figure 2) is a high-rise building and has a foundation 110, a plurality of columns 120, and a plurality of beams 130. In this embodiment, each column 120 and each beam 130 is integrally constructed as the perforated tube structure 1, which will be described later, and the tubes 20 of the perforated tube structure 1 (see Figure 2) bear the bending stress, tensile stress, and shear stress of the structure 100. The structure 100 consists of a lower section 101 on the foundation 110 and a higher section 102 on the lower section 101. Each column 120 and each beam 130 is formed so that the cross-section gradually increases as it goes down to a lower position.

[0014] As shown in Figure 2, the perforated tube structure 1, which forms each column 120 and each beam 130, comprises a structural body 10 made of concrete with a circular cross-section, and a tube 20 arranged on the outer circumference of the structural body 10 with a donut-shaped cross-section. In this embodiment, each column 120 as the first structural part and each beam 130 as the second structural part are cylindrical in shape. The tube 20 is cylindrical in shape, surrounds the structural body 10, and extends vertically in the part corresponding to each column 120 and horizontally in the part corresponding to each beam 130. The concrete contains cement, water, coarse aggregate and fine aggregate, and no reinforcing members such as reinforcing bars extending in a predetermined direction are placed inside the structural body. The type of cement is arbitrary, but in addition to Portland cement, mixed cements such as blast furnace cement, silica cement, and fly ash cement, which are mainly Portland cement mixed with other materials, or special cements such as alumina cement can be used. It is also possible to use cement that contains carbon dioxide. Furthermore, in addition to hydraulic cements such as Portland cement and blast furnace cement, air-hardening cement can also be used. The materials of the coarse aggregate and fine aggregate in this embodiment are arbitrary, and various aggregates such as sand, gravel, crushed sand, crushed stone, slag aggregate, artificial lightweight aggregate, and limestone aggregate can be used as appropriate. In addition, coarse aggregate and fine aggregate containing carbon dioxide can also be used. Note that aggregates such as coarse aggregate and fine aggregate can be omitted if necessary.

[0015] The tube 20 has a greater tensile stress than the main structure 10, and as shown in Figure 3, holes 21 are formed in it that allow the inside to be seen from the outside when concrete is filled into it. Each hole 21 is filled with concrete, and a tube reinforcement section 11 made of concrete is formed inside each hole 21. Here, tensile stress refers to the stress acting per unit area. The material of the tube 20 is arbitrary, but it can be made of plastic, metal, etc. In this embodiment, the tube 20 is made of engineering plastic. Furthermore, in this embodiment, the tube 20 has a greater bending stress and shear stress than the main structure 10, not just tensile stress.

[0016] As shown in Figure 4, when viewed from a direction perpendicular to the forming surface of the tube 20, the tube 20 is formed in a square grid pattern and has a grid portion 22 that forms the outer edge of each hole 21. As shown in Figure 2, in this embodiment, the tube 20 is composed of a plurality of units 23 that are connected to each other. Each unit 23 has connecting recesses and protrusions (not shown) formed on its outer edge, and is connected to adjacent units 23 by fitting the recesses and protrusions together. The means of connecting each unit 23 does not have to be the fitting of recesses and protrusions; for example, it can be screwed together, welded, bonded, etc. In addition, the connection of the portion used for each column 120 and the portion used for each beam 130 in the perforated tube structure 1 is also performed by fitting, screwing, welding, etc. The thickness of the tube 20, the shape and size of the holes 21, the thickness of the portion that partitions each hole 21 in the grid portion 22, etc. are set appropriately according to the application, purpose, required performance, etc.

[0017] Thus, the size of each hole 21 in the tube 20 is arbitrary, but for example, the inscribed circle of each hole 21 can be set to a diameter of 1 mm or more and 100 mm or less. If it is to suppress the outflow of not only aggregate but also cement components from the concrete during concrete filling, it is desirable to set the inscribed circle of each hole 21 to a diameter of 1 mm or more and 20 mm or less. Furthermore, when the tube 20 is used in relatively tall structures such as skyscrapers, the thickness of the tube 20 may exceed several centimeters in the lower parts where the stress is relatively large. In such cases, if relatively viscous concrete such as high-strength concrete is used, it is desirable to set the inscribed circle of each hole 21 to a diameter of 20 mm or more and 100 mm or less so that the concrete can sufficiently fill each hole 21.

[0018] Figure 3 shows a perforated tube structure 1 with a circular cross-section, but the cross-section of the perforated tube structure 1 can be arbitrarily changed. Also, Figure 2 shows columns 120 and beams 130 to which the perforated tube structure 1 is applied extending in a straight line, but the perforated tube structure 1 may be made to extend in a curved manner, or its cross-section may change in the direction of extension. Furthermore, if the structure 100 has structures extending in an oblique direction in addition to columns 120 and beams 130, those structures can also be made into a perforated tube structure integrally with the columns 120 and beams 130.

[0019] The manufacturing method for the perforated tube structure 1 used in the structure 100 configured as described above will be explained with reference to the flowchart in Figure 5. First, the tubes 20 are formed before the concrete forming the main body 10 of the structure is filled (tube preparation step: S1). In this embodiment, the tubes 20 are installed on top of the pressure-resistant slab of the foundation 110. That is, the bottom surfaces of the cylindrical tubes 20 that make up each column 120 are closed by the pressure-resistant slab. The assembly of the tubes 20 may be carried out at the installation site of the structure 100, or it may be carried out in advance at a factory or the like and then transported to the installation site. It is also possible to construct the tubes 20 without dividing them, and in this case as well, for example, the tubes 20 may be manufactured at the installation site using a 3D printer, or the tubes 20 may be manufactured in advance at a factory or the like and then transported to the installation site.

[0020] Next, in the concrete filling process S3 described later, if a load exceeding the allowable stress is applied to the tube 20 during concrete filling due to requirements such as economic design and high-speed construction, a temporary reinforcing tube is installed on top of the tube 20 (reinforcing tube installation process: S2). The reinforcing tube can be used not only for economic design and high-speed construction, but also to suppress the outflow of concrete from each hole 21 of the tube 20. It is preferable to form holes, grooves, etc. on the inner surface of the reinforcing tube to drain excess water seeping out from the tube 20. If the tube 20 can withstand the load during concrete filling and the outflow of concrete from each hole 21 is not at a problematic level, the reinforcing tube installation process S2 can be omitted.

[0021] Next, fresh concrete is filled into the tube 20 (concrete filling process: S3). In this embodiment, the upper ends of the cylindrical tubes 20 that make up each column 120 are open, so the upper ends of the tubes 20 are used as filling holes and fresh concrete is filled into them. Specifically, a flexible pipe drawn in from a pressure pump, hopper, etc. is lowered from the upper end opening of the tube 20 to the bottom of the concrete filling, and fresh concrete is filled while the flexible pipe is pulled up in accordance with the filling speed. Depending on the performance of the pressure pump and flexible pipe, the concrete filling speed, etc., an opening may be made at a predetermined position in the tube 20, and a flexible pipe may be inserted separately from this opening to fill additional concrete. In this case, the flexible pipe inserted from the opening is lowered to the bottom of the concrete filling, the flexible pipe is pulled up in accordance with the filling speed, the flexible pipe is pulled out from the opening, and then the opening is covered.

[0022] When fresh concrete is filled into the tube 20, the concrete fills each hole 21, and the weight of the concrete squeezes out excess water that is not needed for hardening, stopping fluidization and pre-solidifying the concrete (excess water discharge process: S4). The excess water seeping out of the tube 20 is guided to a drainage channel, and the cement component is recovered in a sedimentation tank. The recovered cement component can be molded into aggregate or the like by encapsulating carbon dioxide and reused as filled concrete or other concrete products. In this embodiment, the outer surface of the tube 20 is covered with cement paste that has flowed out from each hole 21. The concrete filling status can be checked from the outside through each hole 21 of the tube 20.

[0023] After this, excess water is drained and the partially solidified concrete is forced into each hole 21 and hardened integrally with the tube 20 (concrete hardening process: S5). As each hole 21 is filled with concrete, the tube reinforcement section 11 is formed. In addition, the cement paste on the outer surface of the tube 20 hardens and forms a coating film.

[0024] Then, once the concrete has achieved sufficient strength to stand on its own, the reinforcing tubes are removed (reinforcing tube removal process: S6). If the reinforcing device installation process S2 is omitted, the reinforcing device removal process S6 is also omitted.

[0025] Furthermore, any finishing method can be selected for the surface of the perforated tube structure 1. For example, it can be used as is, finished with a spray coating, finished by grinding with a polisher, finished by grinding with a polisher and then applying a spray coating, finished by washing with high-pressure water, finished by washing with high-pressure water and then applying a spray coating, finished with a troweled mortar, finished with a troweled mortar and then applied a spray coating, painted, or another material can be attached. In this way, the perforated tube structure 1 of this embodiment can be finished in the same way as the finish of an RC structure.

[0026] According to the manufacturing method of the perforated tube structure 1 of this embodiment, in the excess water discharge step S4, excess water and air in the concrete are released from each hole 21 of the tube 20, so voids are less likely to occur in the concrete, and high fluidity is not required for the concrete being filled. In addition, the release of excess water and air from the concrete improves the density of the concrete.

[0027] In addition, the concrete filling status can be checked from the outside through each hole 21 of the tube 20. This makes it easy to detect any abnormalities in the concrete during filling. Therefore, even if an abnormality such as a void occurs in the concrete, the worker can quickly resolve it.

[0028] Furthermore, by integrating the concrete filling each hole 21 with the tube 20, the overall strength of the structure can be increased. The overall strength of the structure is also increased by improving the density of the concrete. This compensates for the decrease in strength of the tube due to the formation of holes. In this embodiment, the perforated tube structure 1 allows each column 120 and each beam 130 to be an integrated tube structure, eliminating the need for reinforcement at the joints between columns and beams as in conventional structures where the columns are CFTs and the beams are steel structures, and eliminating the need to provide reinforcing materials such as diaphragms inside the tubes. In this way, the necessary strength of the structure can be secured while omitting reinforcing materials such as diaphragms.

[0029] Furthermore, after the concrete has hardened, maintenance work such as injecting, impregnating, or applying repair agents to the concrete can be easily performed through each hole 21 of the tube 20.

[0030] The perforated tube structure 1 of this embodiment solves the problems of CFTs, ​​is applicable not only to low-rise buildings but also to high-rise buildings, has succeeded in making its durability tens of times greater than that of RC structures, and furthermore, can shorten construction time and reduce costs.

[0031] Furthermore, according to the manufacturing method of the perforated tube structure 1 in this embodiment, a coating film made of cement paste is formed on the outer surface of the tube 20. This coating film is carbonated by carbon dioxide in the air to become calcium carbonate. In other words, the tube 20 is coated with calcium carbonate, which has relatively high weather resistance, and the deterioration of the tube 20 is suppressed.

[0032] Furthermore, according to the perforated tube structure 1 of this embodiment, the concrete forming the main body 10 of the structure has a relatively high heat absorption capacity, so the temperature rise of the tube 20 is suppressed in the event of a fire, resulting in a structure with relatively high fire resistance, and therefore fire-resistant coating is unnecessary. In addition, since concrete is exposed from each hole 21 of the tube 20 and the outer surface of the tube 20 is covered with a coating film, the fire resistance is significantly improved compared to conventional perforated tube structures.

[0033] In the concrete filling process S3, since no reinforcing members such as steel bars are placed inside the tube 20, the flow of concrete inside the tube 20 is not obstructed by the reinforcing members. This allows for a reduction in the amount of vibrator used on the concrete compared to when reinforcing members are placed, or even eliminates the need for vibrator work altogether.

[0034] Furthermore, in the excess water discharge process S4, excess water unnecessary for concrete hardening is discharged, reducing the pressure applied from the concrete to the tube 20. Then, fluidization stops before air escapes and concrete hardening begins, and the concrete hardens together with the tube 20. Since the hardened concrete in the tube 20 is not subjected to lateral pressure from the concrete, concrete can be filled to a relatively high position in the tube 20, for example, increasing the daily placement efficiency and shortening the construction period. If reinforcing tubes are set in the reinforcing tube installation process S2, the pressure applied to the tube 20 is further reduced, and the concrete placement efficiency is further improved. In fact, concrete placement experiments for elevator shafts and emergency stairs using the perforated tube structure 1 were conducted, and it was possible to place 12m (equivalent to 4 floors) in one day.

[0035] In the perforated tube structure 1, carbon dioxide from the outside air is supplied to the structure body 10 through each hole 21 of the tube 20, causing the carbonation of the concrete to progress from the surface side to the interior of the structure body 10, and the concrete is transformed into stone material with coarse and fine aggregates as gravel. As a result, the perforated tube structure 1 has a petrified portion on the surface side of the structure body 10. This perforated tube structure 1 has improved strength and durability of the structure body 10 compared to one without a petrified portion. In other words, over time, the strength and durability of the structure body 10 of the perforated tube structure 1 improve. In addition, since the density of the concrete is improved in the excess water discharge process S4, a high-quality petrified portion can be obtained. Furthermore, when cement with carbon dioxide sealed in it is used in fresh concrete, the concrete is carbonated to a predetermined degree, but even in that case, the uncarbonized parts of the concrete are gradually carbonated from the surface side of the structure body 10. In other words, even with concrete carbonated to a predetermined degree, over time, the strength and durability of the concrete structure improve.

[0036] To manufacture a perforated tube structure 1 having a petrified portion, as shown in Figure 6, following the aforementioned tube preparation step S1, concrete filling step S3, excess water discharge step S4, and concrete hardening step S5, a modification step S7 may be included in which carbon dioxide is supplied to the structure body 10 from the outside through each hole 21 of the tube 20, thereby carbonizing at least the surface side of the structure body 10 and transforming it into a petrified portion. In this embodiment, carbon dioxide is supplied to the structure body 10 by exposing the perforated tube structure 1 to the atmosphere. In addition, to promote carbonation, the perforated tube structure 1 may be placed in a space where the concentration of carbon dioxide is higher than that of the atmosphere, or carbon dioxide may be continuously blown onto the perforated tube structure 1. In this embodiment, the tube 20 has the strength to not break due to the stress generated when it is self-supporting in the tube preparation step S1, the stress generated when fresh concrete is filled in the concrete filling step S3, the stress generated when the concrete hardens in the concrete hardening step S5, and the stress generated when the concrete is carbonized in the modification step S7.

[0037] Furthermore, according to the perforated tube structure 1 of this embodiment, the strength of the perforated tube structure 1 will improve if the strength of the tube 20 is maintained, but if the strength of the perforated tube structure 1 meets the predetermined performance requirements, it is not necessarily required to maintain the strength of the tube 20. Here, the method for maintaining the strength of the perforated tube structure 1 of this embodiment will be explained with reference to the flowchart in Figure 7.

[0038] Carbon dioxide is supplied to the main body 10 of the perforated tube structure 1 through each hole 21 of the shell 20, thereby transforming the concrete on the surface side of the main body 10 into a petrified part and increasing the bending strength of the main body 10 (main body strength increase step: S11). Then, a reduction in the bending strength of the tube 20 is permitted within a range where the overall bending strength of the perforated tube structure 1 does not decrease (tube strength reduction step: S12).

[0039] According to this method for maintaining the strength of the perforated tube structure 1, the reduction in the bending strength of the tube 20 is permissible only by the amount by which the bending strength of the structure body 10 increases due to carbonation. Therefore, after the formation of the petrified portion, repair work due to aging deterioration, damage, etc. of the tube 20 can be limited to a range that does not impair its strength, thereby reducing the burden of repair work. This method for maintaining strength is also effective for perforated tube structures 1 in which tensile stress acts on the tube 20, in addition to this embodiment.

[0040] Furthermore, in the main body strength increasing process S11, the surface side of the structural body 10 is transformed into stone material to a depth where the bending strength of the petrified portion exceeds the bending strength of the tube 20, and in the tube strength reducing process S12, the removal of the tube 20 from the structural body 10 is permitted. In this case, in addition to not needing to monitor the progress of concrete carbonation, maintenance of the tube 20 is also unnecessary, making the maintenance of the perforated tube structure 1 even easier. The handling of the tube 20 after removal is permitted in the tube strength reducing process S12 is at the discretion of the user; for example, the tube 20 may be actively dismantled, or it may be left in place without monitoring for deterioration, etc. If the tube 20 is left in place, the outer surface of the tube 20 forms the design surface of the perforated tube structure 1, so the surface of the tube 20 may be decorated as appropriate.

[0041] Furthermore, in the main body strength increasing process S11, the entire main body 10 can be transformed into stone, and in the tube strength reducing process S12, the removal of the tube 20 from the main body 10 can be permitted. In this case, since the entire main body 10 has been transformed into stone, the perforated tube structure 1 will exhibit the same strength and durability as stone. In other words, the perforated tube structure 1 in which the entire main body 10 has been transformed into petrified material is endowed with a durability of over 1,000 years, similar to stone structures such as archaeological sites.

[0042] In the above embodiment, concrete forming the structural body 10 is filled inside the tube 20. However, as shown in Figures 8 and 9, for example, another tube can be placed inside the tube, concrete can be filled between each tube, and the inside of the inner tube can be made hollow. As shown in Figure 8, the structure 200 has a foundation 110 and a structural body 220. As shown in Figure 9, the structural body 220 is a perforated tube structure and has an outer tube 240 with a circular cross-section, an inner tube 250 with a circular cross-section, and a structural body 230 made of concrete that is filled between each tube 240, 250. Each tube 240, 250 has holes formed in it that allow the inside to be seen from the outside when concrete is filled in, similar to the tube 20 in the above embodiment. The structural body 220 is formed so that the diameter and thickness increase as it goes down to a lower position. Multiple openings 201 are formed in the structural body 220, and another structure is provided on the upper part of the structural body 220. The same effects and advantages as in the above embodiment can be obtained in the structure 200 shown in Figures 8 and 9. In this structure 200, in the reinforcing tube installation step S2, the reinforcing tube is provided inside the inner tube 250, or outside the outer tube 240, or both inside the inner tube 250 and outside the outer tube 240.

[0043] Furthermore, as shown in Figure 10, for example, a perforated tube structure can also be applied to a structure 300 that forms an arch bridge. The structure 300 in Figure 10 has a bridge girder 310 and a deck slab 320, and the bridge girder 310 is made of a perforated tube structure. The bridge girder 310 is formed in an arch shape, and its cross-section changes as shown in Figures 11 and 12. In this way, the perforated tube structure can be applied to a structure 300 whose cross-section changes.

[0044] As shown in Figure 12, a perforated tube structure can also be applied to the structure 400 of an arch bridge, which consists of multiple interconnected structures. The structure 400 in Figure 12 has stiffening girders 410, arch ribs 420, multiple support columns 430, and a deck slab 440, and the stiffening girders 410, arch ribs 420, and each support column 430 are made of perforated tube structures. As shown in Figure 13, the stiffening girders 410 are formed in a circular cross-section, provided in pairs in the width direction, and positioned on the outside of the structure 400 in the width direction. Each stiffening girder 410 is connected by a beam section 415 with a circular cross-section that extends in the width direction. The support columns 430 are also formed in a circular cross-section and connect the arch ribs 420 to each support column 430. As shown in Figure 13, this structure 400 has a truss structure.

[0045] As shown in Figure 14, perforated tube structures can also be applied to bridge structures 500 other than arch bridges. The structure 500 in Figure 14 has a foundation 510, columns 520, bridge girders 530, and a deck slab 540, with the columns 520 and bridge girders 530 being made of perforated tube structures. The columns 520 are arranged at predetermined intervals, and the bridge girders 530 are spanned between two columns 520. As shown in Figures 14 and 15, the columns 520 are formed in a rectangular prism shape, and the bridge girders 530 are formed in a semicircular cross-section.

[0046] As shown in Figure 16, the bridge structure 600 can also be constructed by combining cylindrical perforated tube structures. The structure 600 in Figure 16 has a foundation 610, columns 620, bridge girders 630, and a deck slab 640, with the columns 620 and bridge girders 630 being made of perforated tube structures. The columns 620 are arranged at predetermined intervals, and the bridge girders 630 are spanned between two columns 620. As shown in Figures 16 and 17, the columns 620 and bridge girders 630 are each made by arranging multiple cylindrical perforated tube structures in the width direction of the structure 600.

[0047] Although embodiments of the present invention have been described above, the embodiments described above do not limit the invention as defined in the claims. Furthermore, it should be noted that not all combinations of features described in the embodiments are necessarily essential for solving the problem of the invention. [Explanation of Symbols]

[0048] 1. Perforated tube structure 10 Main structure 11 Tube reinforcement section 20 tubes 21 holes 100 structures 200 Structures 300 Structures 400 Structures 500 structures 600 Structures S1 Tube preparation process S3 Concrete filling process S4 Surplus water discharge process S5 Concrete hardening process

Claims

1. A method for manufacturing a perforated tube structure used in the construction of a structure, The perforated tube structure comprises a structural body made of concrete, a tube that surrounds the structural body and extends in a predetermined direction to bear the bending stress, tensile stress and shear stress of the structure, and holes formed in the tube that allow the interior to be seen from the outside. A tube preparation step for preparing the aforementioned tube, The concrete filling step involves filling the inside of the tube with fresh concrete, A process to temporarily solidify the concrete by filling the hole with the concrete while the inside can be seen through the hole, and by using the weight of the concrete to squeeze out excess water that is not needed for hardening, thereby stopping the fluidity, A method for manufacturing a perforated tube structure, comprising a concrete hardening step of allowing the concrete, which has been partially solidified after the excess water has been discharged, to bite into the holes and harden integrally with the tube.

2. A perforated tube structure used in the construction of a structure, The main structure is made of concrete, A tube that surrounds the main body of the structure and extends in a predetermined direction, bearing the bending stress, tensile stress and shear stress of the structure, The tube comprises a hole formed in the tube, The concrete of the main body of the structure has hardened integrally with the tube by being embedded in the hole. It has a first structural part extending in a first direction, and a second structural part connected to the first structural part and extending in a second direction, A perforated tube structure in which the tube and concrete of the first and second structural parts are integrally formed.

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