Concrete structural body, and method for constructing concrete structural body

Abstract

A concrete structural body having an outer cable, wherein the outer cable includes a duct having a duct component, the duct component has a main body portion into which a PC steel material is inserted and a grout is filled, at least one cylindrical portion protruding outward from an outer circumferential surface of the main body portion, and a lid portion provided to the at least one cylindrical portion, the at least one cylindrical portion has a first end portion connected to the main body portion, and a second end portion provided with the lid portion, the at least one cylindrical portion protrudes in an upward direction from the outer circumferential surface of the main body portion, and a position of the second end portion of the at least one cylindrical portion is higher than a position of the duct located at a top portion of the outer cable.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a duct component, a duct, a concrete structural body, and a method for constructing a concrete structural body. The present application claims priority based on Japanese Patent Application No. 2022-208276 filed on Dec. 26, 2022, the entire contents of which are incorporated herein by reference.BACKGROUND ART

[0002] A prestressed concrete structural body to which a compressive stress is applied by a PC steel material is known. The PC steel material in a tensioned state is fixed to a concrete structural body. The concrete structural body has an outer cable structure. In the outer cable structure, an outer cable is installed outside a concrete member. The outer cable includes a duct that penetrates the concrete member and is drawn out to the outside, and the PC steel material inserted into the duct. The duct is a tubular member. A grout is filled into the duct. The grout protects the PC steel material from corrosion.

[0003] PTL 1 to PTL 3 each disclose a sheath into which a PC steel material is inserted. PTL 1 and PTL 2 each disclose a sheath used for an inner cable. In the sheath described in each of PTL 1 and PTL 2, at least a part of the sheath embedded in a concrete member is a sheath with an observation hole. PTL 3 discloses a sheath used for an outer cable. The sheath described in PTL 3 is a transparent sheath formed by a transparent material.CITATION LISTPatent LiteraturePTL 1: Japanese Patent Laying-Open No. 2004-76292

[0005] PTL 2: Japanese Patent Laying-Open No. 2002-235441

[0006] PTL 3: Japanese Patent Laying-Open No. 2001-32211SUMMARY OF INVENTION

[0007] A duct component of the present disclosure is

[0008] a duct component constituting a part of a duct of an outer cable, the duct component including:

[0009] a main body portion into which a PC steel material is inserted and a grout is filled;

[0010] at least one cylindrical portion protruding outward from an outer circumferential surface of the main body portion; and

[0011] a lid portion provided to the at least one cylindrical portion, wherein

[0012] the at least one cylindrical portion has

[0013] a first end portion connected to the main body portion, and

[0014] a second end portion provided with the lid portion.BRIEF DESCRIPTION OF DRAWINGS

[0015] FIG. 1 is a perspective view schematically showing a structure of a concrete structural body having an outer cable.

[0016] FIG. 2 is a cross sectional view schematically showing the structure of the concrete structural body having the outer cable.

[0017] FIG. 3 is a cross sectional view schematically showing the outer cable.

[0018] FIG. 4 is a perspective view schematically showing a duct component according to an embodiment.

[0019] FIG. 5 is a perspective view schematically showing a main body portion included in the duct component according to the embodiment.

[0020] FIG. 6 is a cross sectional view schematically showing the duct component according to the embodiment.

[0021] FIG. 7 is a cross sectional view schematically showing a part of a duct according to the embodiment.

[0022] FIG. 8 is a cross sectional view schematically showing a part of the duct according to the embodiment.

[0023] FIG. 9 is a cross sectional view schematically showing a part of the concrete structural body according to the embodiment.

[0024] FIG. 10 is a diagram showing an example of a flow of steps of a method for constructing the concrete structural body according to the embodiment.DETAILED DESCRIPTIONProblem to Be Solved by the Present Disclosure

[0025] When a grout is filled into a duct, the grout may not be completely filled into the duct. In a portion where insufficient filling of the grout occurs, a void may be formed in a part of the duct, and thereby a part of a PC steel material may be exposed from the grout. The grout does not protect the exposed part of the PC steel material from corrosion. Further, water separated from the grout may accumulate in the part where the void is formed. The water accumulated in the void may cause corrosion of the PC steel material. Accordingly, it is desired to easily check a filled state of the grout in the duct.

[0026] When the grout filled in the duct does not satisfy a predetermined performance, the function of protecting the PC steel material from corrosion is degraded. Accordingly, it is desired that the performance of the grout in the duct can be easily checked.

[0027] The sheath described in each of PTL 1 and PTL 2 constitutes a duct of the inner cable. In PTL 1 and PTL 2, the sheath is provided with the sheath with the observation hole to make it possible to check a filled state of a grout in the sheath embedded in the concrete member, from the observation hole. In the sheath with the observation hole described in each of PTL 1 and PTL 2, a cylindrical member constituting the observation hole is not connected to a main body portion of the sheath. With the techniques described in PTL 1 and PTL 2, it is not possible to take out the grout in the sheath from the observation hole. Accordingly, although it is possible to perform a performance test of the grout before the grout is filled into the sheath, it is not possible to perform a performance test of the grout in a state filled in the sheath. The sheath described in PTL 3 constitutes a duct of the outer cable. In PTL 3, the transparent sheath is used to make it possible to check a filled state of a grout in the sheath. Since the technique described in PTL 3 is also not configured to take out the grout in the sheath, it is not possible to perform a performance test of the grout in a state filled in the sheath.

[0028] One object of the present disclosure is to provide a duct component capable of checking a filled state of a grout filled in a duct, and performing a performance test of the grout in a state filled in the duct, in an outer cable.Advantageous Effect of the Present Disclosure

[0029] The duct component of the present disclosure can check a filled state of a grout filled in a duct, and can perform a performance test of the grout in a state filled in the duct, in an outer cable.Description of Embodiment of the Present Disclosure

[0030] First, an embodiment of the present disclosure will be described in list form.

[0031] (1) A duct component of the present disclosure is

[0032] a duct component constituting a part of a duct of an outer cable, the duct component including:

[0033] a main body portion into which a PC steel material is inserted and a grout is filled;

[0034] at least one cylindrical portion protruding outward from an outer circumferential surface of the main body portion; and

[0035] a lid portion provided to the at least one cylindrical portion, wherein

[0036] the at least one cylindrical portion has

[0037] a first end portion connected to the main body portion, and

[0038] a second end portion provided with the lid portion.

[0039] In the duct component, a filled state of the grout filled in the main body portion can be checked. For example, by removing the lid portion from the cylindrical portion, the filled state of the grout filled in the main body portion can be visually checked from the cylindrical portion. While the grout is filled, the status of the grout flowing through the main body portion can also be visually checked. Further, in the duct component, it is possible to take out the grout filled in the cylindrical portion before the grout is cured and after the grout is cured, and perform a performance test of the grout. Since the main body portion and the cylindrical portion are connected to each other, the grout filled into the main body portion is also filled into the cylindrical portion. The grout in the cylindrical portion can be taken out by removing the cylindrical portion from the main body portion. Therefore, in the duct component, it is possible to check the filled state of the grout filled in the duct, and to perform the performance test of the grout in a state filled in the duct, in the outer cable. The subject of the performance test of the grout is at least one of the uncured grout and the cured grout.

[0040] (2) In the duct component in (1),

[0041] the at least one cylindrical portion may include a plurality of cylindrical portions,

[0042] the plurality of cylindrical portions may have a first cylindrical portion and a second cylindrical portion, and

[0043] the first cylindrical portion and the second cylindrical portion may be provided in directions orthogonal to each other with respect to a longitudinal axis of the main body portion.

[0044] According to the configuration in (2), it is possible to check the filled state of the grout in the main body portion, from any of the first cylindrical portion and the second cylindrical portion. The filled state of the grout in the main body portion can be checked from different directions.

[0045] (3) In the duct component in (2),

[0046] the plurality of cylindrical portions may be disposed with a spacing therebetween along the longitudinal axis of the main body portion.

[0047] According to the configuration in (3), the plurality of cylindrical portions are disposed at different positions along the longitudinal axis of the main body portion. Accordingly, the filled state of the grout at different positions of the main body portion can be checked.

[0048] (4) In the duct component in any one of (1) to (3),

[0049] the first end portion may be detachably coupled to the main body portion.

[0050] According to the configuration in (4), the cylindrical portion can be easily removed from the main body portion. Since the grout in the cylindrical portion can be easily taken out, the performance test of the grout can be easily performed.

[0051] (5) In the duct component in (4),

[0052] the first end portion and the main body portion may be coupled by a threaded structure.

[0053] According to the configuration in (5), the cylindrical portion can be easily removed from the main body portion. When the grout is filled into the cylindrical portion, the cylindrical portion is less likely to be detached from the main body portion.

[0054] (6) In the duct component in any one of (1) to (5),

[0055] the at least one cylindrical portion may be constituted by a transparent resin.

[0056] According to the configuration in (6), the filled state of the grout filled in the main body portion can be visually checked through the cylindrical portion, without removing the lid portion from the cylindrical portion.

[0057] (7) In the duct component in any one of (1) to (6),

[0058] the lid portion may be constituted by a transparent resin.

[0059] According to the configuration in (7), the filled state of the grout filled in the main body portion can be visually checked through the lid portion, without removing the lid portion from the cylindrical portion.

[0060] (8) In the duct component in any one of (1) to (7),

[0061] the main body portion may be constituted by a transparent resin.

[0062] According to the configuration in (8), the filled state of the grout filled in the main body portion can be directly visually checked.

[0063] (9) In the duct component in any one of (1) to (8),

[0064] the lid portion may have a through hole to which a hose is attached.

[0065] According to the configuration in (9), when the grout is filled into the duct, the grout filled in the cylindrical portion can be discharged through the hose attached to the through hole. By inspecting the uncured grout discharged from the hose, the quality of the grout filled in the duct can be checked.

[0066] (10) In the duct component in any one of (1) to (9),

[0067] the duct component may be a coupler that couples a first duct unit constituting the duct and a second duct unit constituting the duct.

[0068] According to the configuration in (10), the duct can be constituted by coupling the first duct unit and the second duct unit by the duct component.

[0069] (11) A duct of the present disclosure includes

[0070] the duct component according to any one of (1) to (10).

[0071] The duct includes the duct component. In the duct, the filled state of the grout filled in the duct can be checked, and the performance test of the grout in the state filled in the duct can be performed.

[0072] (12) The duct in (11) may further include a duct unit,

[0073] the duct component may be coupled to the duct unit, and

[0074] the main body portion of the duct component and the duct unit may be connected by welding.

[0075] According to the configuration in (12), the duct component and the duct unit can be firmly coupled to each other.

[0076] (13) A concrete structural body of the present disclosure is

[0077] a concrete structural body having an outer cable, wherein

[0078] the outer cable includes the duct according to (11) or (12), and

[0079] the at least one cylindrical portion protrudes in an upward direction from an outer circumferential surface of the main body portion.

[0080] In the concrete structural body, the outer cable includes the duct. In the concrete structural body, the filled state of the grout filled in the duct can be checked, and the performance test of the grout in the state filled in the duct can be performed. By checking the filled state of the grout in the main body portion from the cylindrical portion protruding in the upward direction, insufficient filling of the grout is easily determined.

[0081] (14) In the concrete structural body in (13),

[0082] the at least one cylindrical portion may include a plurality of cylindrical portions,

[0083] the plurality of cylindrical portions may have a first cylindrical portion and a second cylindrical portion,

[0084] the first cylindrical portion may protrude in the upward direction from the outer circumferential surface of the main body portion, and

[0085] the second cylindrical portion may protrude in a horizontal direction from the outer circumferential surface of the main body portion.

[0086] According to the configuration in (14), by checking the filled state of the grout in the main body portion from the first cylindrical portion, insufficient filling of the grout is easily determined. According to the configuration in (14), it is possible to take out the grout in the second cylindrical portion, and perform the performance test of the grout.

[0087] (15) In the concrete structural body in (13) or (14),

[0088] the outer cable may be installed so as to have undulations with respect to the concrete structural body,

[0089] the concrete structural body may have a first support portion that supports a top portion of the outer cable, and a second support portion that supports a bottom portion of the outer cable,

[0090] the duct may include a first region close to the first support portion, and

[0091] the duct component may be provided in the first region.

[0092] As described later, insufficient filling of the grout is likely to occur in the first region. According to the configuration in (14), since the duct component is provided in the first region close to the top portion of the outer cable, it can be estimated whether insufficient filling of the grout does not occur over the entire length of the duct.

[0093] (16) In the concrete structural body in any one of (13) to (15),

[0094] a position of the second end portion of the at least one cylindrical portion may be higher than a position of the duct located at a top portion of the outer cable.

[0095] According to the configuration in (16), it can be estimated whether insufficient filling of the grout does not occur in the duct located at the top portion of the outer cable.

[0096] (17) A method for constructing a concrete structural body of the present disclosure includes:

[0097] installing the duct according to (11) or (12) in a concrete structural body;

[0098] inserting a PC steel material into the duct;

[0099] tensioning the PC steel material, after the inserting of the PC steel material;

[0100] filling a grout into the main body portion of the duct component, after the tensioning of the PC steel material; and

[0101] checking a filled state of the grout filled in the main body portion of the duct component, after the filling of the grout.

[0102] The method for constructing the concrete structural body can check the filled state of the grout filled in the duct.

[0103] (18) In the method for constructing the concrete structural body in (17),

[0104] when filling of the grout is insufficient in the checking of the filled state of the grout, the grout may be reinjected from the at least one cylindrical portion.

[0105] According to the configuration in (18), insufficient filling of the grout can be compensated.

[0106] (19) In the method for constructing the concrete structural body in (17) or (18),

[0107] in the filling of the grout, the grout may be filled into the at least one cylindrical portion, and the method may include taking out the grout filled in the at least one cylindrical portion, and performing a performance test of the grout.

[0108] According to the configuration in (19), it is possible to evaluate whether the grout filled in the duct satisfies a predetermined performance.

[0109] (20) In the method for constructing the concrete structural body in any one of (17) to (19),

[0110] in the checking of the filled state of the grout, the filled state of the grout filled in the main body portion may be shot with a camera, and a shot image may be recorded in a recording medium.

[0111] According to the configuration in (20), by shooting the filled state of the grout with the camera and recording the shot image in the recording medium, it is possible to utilize it for quality assurance.Details of Embodiment of the Present Disclosure

[0112] Hereinafter, specific examples of the duct component, the duct, the concrete structural body, and the method for constructing the concrete structural body according to the embodiment of the present disclosure will be described with reference to the drawings. The same reference numerals in the drawings designate the same or corresponding parts.Summary

[0113] Prior to the detailed description of the embodiment, a summary of a concrete structural body 100 having an outer cable 1 will be described with reference to FIGS. 1 to 3. An example of concrete structural body 100 will be described with reference to FIGS. 1 and 2. In this example, concrete structural body 100 is a main beam 110 in a bridge. FIG. 1 is a perspective view showing a structure of main beam 110. FIG. 2 is a cross sectional view of main beam 110 seen from a side surface. In FIG. 1, a part of an upper floor plate 111 is cut away. FIG. 2 shows a cross section of the bridge cut in a vertical plane along a longitudinal axis of main beam 110. Main beam 110 is provided on bridge piers 120. A bearing (not shown) is installed between main beam 110 and bridge pier 120. Main beam 110 has upper floor plate 111, a lower floor plate 112, webs 113, and cross beams 114. Web 113 is a portion constituting a side surface of main beam 110. Web 113 connects upper floor plate 111 and lower floor plate 112. As shown in FIG. 2, cross beams 114 include end cross beams 114e and an intermediate cross beam 114c. End cross beams 114e are respectively provided at both end portions of main beam 110. Intermediate cross beam 114c is provided at an intermediate portion of main beam 110.

[0114] As shown in FIG. 1, a cross section orthogonal to the longitudinal axis of main beam 110 is formed in a box shape by upper floor plate 111, lower floor plate 112, and two webs 113. Main beam 110 has an internal space surrounded by upper floor plate 111, lower floor plate 112, and two webs 113. Main beam 110 has deflection portions 115 on lower floor plate 112. Deflection portions 115 are disposed in main beam 110. Deflection portion 115 is provided between end cross beam 114e and intermediate cross beam 114c.

[0115] Outer cable 1 applies a compressive stress to concrete structural body 100. Outer cable 1 is installed outside a concrete member constituting concrete structural body 100. In this example, outer cable 1 is installed in main beam 110. As shown in FIG. 2, outer cable 1 is installed so as to have undulations along a longitudinal axis of outer cable 1, with respect to main beam 110. Both end portions of outer cable 1 are fixed to end cross beams 114e by fixtures 200. An intermediate portion of outer cable 1 is supported by intermediate cross beam 114c and deflection portions 115. Of outer cable 1, portions supported by end cross beams 114e and intermediate cross beam 114c are each located at a top portion 1t, and portions supported by deflection portions 115 are each located at a bottom portion 1b. That is, in main beam 110, end cross beams 114e and intermediate cross beam 114c are each a first support portion that supports top portion It of outer cable 1. Deflection portions 115 are each a second support portion that supports bottom portion 1b of outer cable 1. Top portion 1t of outer cable 1 is the highest position in outer cable 1. Bottom portion 1b of outer cable 1 is the lowest position in outer cable 1.

[0116] As shown in FIG. 3, outer cable 1 includes PC steel materials 2 and a duct 3. FIG. 3 shows a cross section orthogonal to the longitudinal axis of outer cable 1. PC steel materials 2 are inserted and a grout (not shown) is filled into duct 3. PC steel material 2 is a PC strand 20 formed by twisting a plurality of PC steel wires. In this example, a plurality of PC strands 20 are inserted into one duct 3. The grout is formed from cement milk prepared by mixing cement and water, grease, or wax, for example.

[0117] The duct component according to the embodiment is provided in a first region 3a surrounded by a two-dot chain line in FIG. 2. Details of first region 3a will be described later.

[0118] Hereinafter, details of the embodiment will be described.Duct Component

[0119] A duct component 30 according to the embodiment will be described with reference to FIGS. 4 to 6. Duct component 30 constitutes a part of duct 3 of outer cable 1 described above. As shown in FIG. 4, duct component 30 has a main body portion 40, cylindrical portions 50, and lid portions 60.Main Body Portion

[0120] As shown in FIG. 5, main body portion 40 is a tubular member. As shown in FIG. 6, PC strands 20 are inserted and a grout 25 is filled into main body portion 40. FIG. 6 shows a cross section orthogonal to a longitudinal axis of main body portion 40. In this example, main body portion 40 has a cylindrical shape. An outer circumferential surface 40a of main body portion 40 is provided with openings 45 connected to an internal space of main body portion 40. Cylindrical portion 50 is connected to opening 45. In this example, an attachment seat for connecting cylindrical portion 50 is provided around opening 45. The attachment seat is an annular portion slightly protruding from the outer circumferential surface of main body portion 40. The attachment seat is formed integrally with main body portion 40.

[0121] Openings 45 are formed at positions where cylindrical portions 50 shown in FIG. 4 are provided. The number of openings 45 is the same as the number of cylindrical portions 50. In this example, as shown in FIG. 5, main body portion 40 is provided with a plurality of openings 45.

[0122] Main body portion 40 has a first coupling end 41 and a second coupling end 42. As described later, first coupling end 41 and second coupling end 42 are portions to which other duct units are coupled.

[0123] Main body portion 40 may be constituted by a resin. Examples of the resin constituting main body portion 40 include polyethylene (PE) and polyvinyl chloride (PVC). Main body portion 40 may be constituted by a transparent resin. When main body portion 40 is constituted by a transparent resin, a filled state of grout 25 filled in main body portion 40 can be directly visually checked. While grout 25 is filled, the status of grout 25 flowing through main body portion 40 can also be visually checked.

[0124] Main body portion 40 has a length of 300 mm or more and 2000 mm or less, for example. Main body portion 40 may have a length of 500 mm or more and 1000 mm or less. Main body portion 40 has an outer diameter of 100 mm or more and 200 mm or less, for example. Main body portion 40 may have an outer diameter of 100 mm or more and 120 mm or less. The size of opening 45 corresponds to the size of cylindrical portion 50. Opening 45 has an inner diameter of 30 mm or more and 100 mm or less, for example.Cylindrical Portion

[0125] As shown in FIG. 4, cylindrical portion 50 protrudes outward from outer circumferential surface 40a of main body portion 40. As shown in FIG. 6, main body portion 40 and cylindrical portion 50 communicate with each other through opening 45. Cylindrical portion 50 has a first end portion 51 and a second end portion 52. First end portion 51 is connected to opening 45 and thereby communicates with main body portion 40. Second end portion 52 is provided with lid portion 60. In this example, cylindrical portion 50 has a cylindrical shape. Since main body portion 40 and cylindrical portion 50 communicate with each other, grout 25 filled into main body portion 40 is also filled into cylindrical portion 50.

[0126] It is only necessary that at least one cylindrical portion 50 is provided. In this example, as shown in FIG. 4, a plurality of cylindrical portions 50 are provided to main body portion 40. The plurality of cylindrical portions 50 are disposed with a spacing therebetween along the longitudinal axis of main body portion 40. That is, the plurality of cylindrical portions 50 are disposed at different positions along the longitudinal axis of main body portion 40. In this case, the positions of openings 45 to which cylindrical portions 50 are connected are displaced from each other along the longitudinal axis of main body portion 40. Accordingly, the strength of main body portion 40 can be easily ensured, when compared with a case where openings 45 are provided at the same position along the longitudinal axis of main body portion 40.

[0127] In this example, the plurality of cylindrical portions 50 have first cylindrical portions 50a and second cylindrical portions 50b. First cylindrical portion 50a and second cylindrical portion 50b are provided in directions orthogonal to each other with respect to main body portion 40. That is, the direction in which first cylindrical portion 50a protrudes is orthogonal to the direction in which second cylindrical portion 50b protrudes. When first cylindrical portion 50a protrudes in an upward direction from outer circumferential surface 40a of main body portion 40 as shown in FIG. 6, second cylindrical portion 50b protrudes in a horizontal direction from outer circumferential surface 40a of main body portion 40. Second cylindrical portion 50b only needs to be provided at any of two positions orthogonal to a position where first cylindrical portion 50a protrudes, on outer circumferential surface 40a of main body portion 40. In this example, second cylindrical portion 50b is provided at only one of the two positions. Second cylindrical portion 50b may be provided at each of the two positions. In this case, two second cylindrical portions 50b are respectively provided at symmetrical positions on outer circumferential surface 40a. The plurality of cylindrical portions 50 may include only a plurality of first cylindrical portions 50a. The number of first cylindrical portions 50a and the number of second cylindrical portions 50b may each be one, or may each be plural.

[0128] In this example, the plurality of first cylindrical portions 50a and a plurality of second cylindrical portions 50b are provided. The plurality of first cylindrical portions 50a and the plurality of second cylindrical portions 50b are each disposed with a spacing therebetween along the longitudinal axis of main body portion 40. In this example, first cylindrical portions 50a and second cylindrical portions 50b are disposed at different positions along the longitudinal axis of main body portion 40. That is, the positions of openings 45 to which first cylindrical portions 50a are connected and the positions of openings 45 to which second cylindrical portions 50b are connected are displaced from each other along the longitudinal axis of main body portion 40. Accordingly, as described above, the strength of main body portion 40 can be easily ensured, when compared with the case where openings 45 are provided at the same position along the longitudinal axis of main body portion 40. First cylindrical portion 50a and second cylindrical portion 50b may be disposed at the same position along the longitudinal axis of main body portion 40. That is, first cylindrical portion 50a and second cylindrical portion 50b may be provided on the same circumference about the axis of main body portion 40.

[0129] In this example, first end portion 51 of cylindrical portion 50 is detachably coupled to main body portion 40. First end portion 51 and opening 45 are coupled by a threaded structure. When cylindrical portion 50 is detachably coupled to main body portion 40, cylindrical portion 50 can be easily removed from main body portion 40. By removing cylindrical portion 50 from main body portion 40, cured grout 25 filled in cylindrical portion 50 can be easily taken out. Grout 25 in cylindrical portion 50 is subjected to a performance test of the grout. Cylindrical portion 50 may be fixed to main body portion 40 by welding or adhesion, for example. In this case, grout 25 in cylindrical portion 50 can be taken out by cutting cylindrical portion 50 and removing it from main body portion 40. When cylindrical portion 50 is detachably coupled to main body portion 40 as described above, but cylindrical portion 50 cannot be detached due to curing of grout 25, cylindrical portion 50 may be cut and removed.

[0130] Cylindrical portion 50 may be constituted by a resin. Examples of the resin constituting cylindrical portion 50 include PE, polyethylene terephthalate (PET), and PVC. Cylindrical portion 50 may be constituted by a transparent resin.

[0131] Cylindrical portion 50 has a length of 50 mm or more and 200 mm or less, for example. Cylindrical portion 50 has an outer diameter of 30 mm or more and 100 mm or less, for example.Lid Portion

[0132] As shown in FIG. 4, lid portion 60 is provided to cylindrical portion 50. As shown in FIG. 6, lid portion 60 is a member that closes an opening of cylindrical portion 50. Lid portion 60 is provided at second end portion 52 of cylindrical portion 50.

[0133] In this example, lid portion 60 and cylindrical portion 50 are each constituted by an independent member. Lid portion 60 is detachably coupled to second end portion 52 by a threaded structure. Lid portion 60 may be formed integrally with cylindrical portion 50.

[0134] Lid portion 60 may be constituted by a resin. Examples of the resin constituting cylindrical portion 50 include PE, PET, and PVC. Lid portion 60 may be constituted by a transparent resin. In this example, lid portion 60 is constituted by a transparent resin.

[0135] Lid portion 60 may have any size corresponding to second end portion 52.

[0136] When lid portion 60 is detachably coupled to cylindrical portion 50, lid portion 60 can be easily removed from cylindrical portion 50. By removing lid portion 60 from cylindrical portion 50, the filled state of grout 25 filled in main body portion 40 can be visually checked. Furthermore, it is also possible to take out uncured grout 25 filled in cylindrical portion 50, and perform the performance test of the grout. When at least one of cylindrical portion 50 and lid portion 60 is constituted by a transparent resin, the filled state of grout 25 filled in main body portion 40 can be visually checked without removing lid portion 60. While grout 25 is filled, the status of grout 25 flowing through main body portion 40 can also be visually checked.

[0137] As shown in FIG. 6, lid portion 60 may have a through hole 60h. A hose (not shown) is attached to through hole 60h. As shown in FIG. 9 described later, the hose is provided to discharge grout 25 filled in cylindrical portion 50 when grout 25 is filled into duct 3. By inspecting uncured grout 25 discharged from the hose, the quality of grout 25 filled in duct 3 can be checked. The hose is detachably attached to through hole 60h by a threaded structure, for example. When the hose is not attached to through hole 60h, through hole 60h is closed by a plug (not shown).Duct

[0138] Duct 3 according to the embodiment will be described with reference to FIGS. 7 and 8. Duct 3 includes duct component 30 according to the embodiment described above. Duct 3 is constituted by coupling duct component 30 and other duct units. In duct 3 shown in FIGS. 7 and 8, duct component 30 is disposed between a first duct unit 31 and a second duct unit 32. First duct unit 31 and second duct unit 32 are respectively connected to both end portions of main body portion 40. The length of each of first duct unit 31 and second duct unit 32 is not particularly limited. First duct unit 31 and second duct unit 32 generally have a length of several ten meters or more. First duct unit 31 and second duct unit 32 are different from duct component 30 in that they do not have cylindrical portion 50 and lid portion 60. First duct unit 31 and second duct unit 32 are each a tubular member constituted by a resin, as with main body portion 40. First duct unit 31 is connected to first coupling end 41. Second duct unit 32 is connected to second coupling end 42. In duct 3 shown in FIG. 7, an end portion of first duct unit 31 is connected to first coupling end 41 by butt welding. An end portion of second duct unit 32 is connected to second coupling end 42 by butt welding.

[0139] In duct 3 shown in FIG. 8, duct component 30 is a coupler that couples first duct unit 31 and second duct unit 32. The coupler is a connection member that connects the two duct units. In duct 3 shown in FIG. 8, an end portion of first duct unit 31 is connected to first coupling end 41 by insertion welding. An end portion of second duct unit 32 is connected to second coupling end 42 by insertion welding. First coupling end 41 and second coupling end 42 are respectively provided with heating wires 80 for welding the coupling ends to the end portion of first duct unit 31 and the end portion of second duct unit 32.

[0140] Since main body portion 40 and the duct units are connected by welding as described above, duct component 30 can be firmly coupled to the duct units. Since main body portion 40 and the duct units are welded, a gap is less likely to be formed between main body portion 40 and the duct units.Concrete Structural Body

[0141] Concrete structural body 100 according to the embodiment will be described with reference to FIGS. 2 and 9. As described above, concrete structural body 100 is main beam 110. Outer cable 1 is installed in main beam 110. As shown in FIG. 2, top portion 1t of outer cable 1 is supported by cross beam 114. Bottom portion 1b of outer cable 1 is supported by deflection portion 115. Duct 3 has first region 3a in the vicinity of cross beam 114. First region 3a is a region close to cross beam 114 serving as the first support portion, and is located on any of both sides of cross beam 114. For example, first region 3a is a range within two meters from a wall surface of cross beam 114. First region 3a has a downward gradient from cross beam 114 toward deflecting portion 115. In first region 3a, insufficient filling of the grout is likely to occur. This is because, when the grout is filled into duct 3 from an end portion of duct 3, a void is likely to remain in first region 3a having a downward gradient as seen from top portion 1t.

[0142] As shown in FIG. 9, duct 3 includes duct component 30. Duct component 30 is provided in first region 3a. As shown in FIGS. 4 and 6, duct component 30 has first cylindrical portions 50a and second cylindrical portions 50b. Although second cylindrical portions 50b are not shown in FIG. 9, they exist. As shown in FIG. 9, in duct 3, duct component 30 is provided such that first cylindrical portion 50a protrudes in the upward direction from main body portion 40. Second cylindrical portion 50b protrudes in the horizontal direction from main body portion 40. The upward direction and the horizontal direction are directions in a state where the outer cable is installed.

[0143] Since duct 3 includes duct component 30, the filled state of grout 25 filled in main body portion 40 can be visually checked, as described above. Since duct component 30 is provided in first region 3a where insufficient filling of grout 25 is likely to occur, it is possible to grasp the filled state of grout 25 over the entire length of duct 3. When insufficient filling of grout 25 does not occur in first region 3a, it can be estimated that insufficient filling of grout 25 does not occur in a region lower than a position of first region 3a.

[0144] A position of second end portion 52 (see FIG. 6) of at least one first cylindrical portion 50a may be higher than a position of duct 3 located at top portion 1t. If grout 25 is filled into this first cylindrical portion 50a, it can be estimated that insufficient filling of grout 25 does not occur in duct 3 located at top portion 1t.

[0145] As shown in FIG. 6, the filled state of grout 25 can be checked from any of first cylindrical portion 50a and second cylindrical portion 50b. When the filled state of grout 25 is checked from first cylindrical portion 50a, it is easier to determine whether PC steel materials 2 are exposed from grout 25, and thus it is easier to determine insufficient filling of grout 25.

[0146] When it is determined that filling of grout 25 is insufficient, grout 25 can be reinjected from cylindrical portion 50. For example, lid portion 60 of first cylindrical portion 50a is removed, and grout 25 is reinjected from first cylindrical portion 50a. When grout 25 is reinjected from one first cylindrical portion 50a among the plurality of first cylindrical portions 50a, a hose (not shown) may be attached to another first cylindrical portion 50a to discharge air in a void formed due to insufficient filling of grout 25. The hose may be connected to second end portion 52 by removing lid portion 60, for example. The hose may be attached to through hole 60h of lid portion 60 described above.

[0147] Further, after grout 25 is cured, the performance test of grout 25 filled in cylindrical portion 50 can be performed. As described above, grout 25 in cylindrical portion 50 can be taken out by removing cylindrical portion 50 from main body portion 40. For example, second cylindrical portion 50b is removed from main body portion 40, and grout 25 in second cylindrical portion 50b is taken out. After grout 25 in cylindrical portion 50 is taken out, removed cylindrical portion 50 may be attached to main body portion 40 again. Instead of removed cylindrical portion 50, another member (not shown) may close opening 45 (see FIGS. 5 and 6) of main body portion 40. The performance test of grout 25 is performed to evaluate whether at least one of density, strength, and alkalinity of the grout satisfies a predetermined performance, for example.Method for Constructing Concrete Structural Body

[0148] Concrete structural body 100 described above is built by the method for constructing the concrete structural body according to the embodiment. As shown in FIG. 10, the method for constructing the concrete structural body includes the following first step S1 to fifth step S5. Each step will be described in detail.First Step

[0149] As shown in FIG. 2, in first step S1, duct 3 is installed in concrete structural body 100. Concrete structural body 100 is main beam 110. A through hole through which duct 3 passes is provided in each of cross beams 114 and deflection portions 115. Duct 3 is supported by the through holes provided in cross beams 114 and deflection portions 115. As shown in FIG. 9, duct component 30 is disposed in first region 3a. Second Step

[0150] In second step S2, PC steel materials 2 (see FIG. 3) are inserted into duct 3. PC steel materials 2 are inserted from an end portion of duct 3.Third Step

[0151] In third step S3, PC steel materials 2 inserted in duct 3 are tensioned. After PC steel materials 2 are tensioned, both end portions of PC steel materials 2 are respectively fixed to end cross beams 114e by fixtures 200 shown in FIG. 2. As shown in FIG. 9, PC steel materials 2 in duct 3 located at top portion It are located at a lower part in duct 3 due to a tensioning force. PC steel materials 2 in duct 3 located at bottom portion 1b shown in FIG. 2 are located at an upper part in duct 3 due to the tensioning force.Fourth Step

[0152] In fourth step S4, grout 25 (see FIG. 9) is filled into duct 3 after third step S3. Grout 25 is filled into duct 3 from an end portion of duct 3. For example, when lid portion 60 has through hole 60h described above, a hose may be attached to through hole 60h when grout 25 is filled. By attaching the hose to through hole 60h of lid portion 60, the grout filled in cylindrical portion 50 is discharged through the hose. By inspecting uncured grout 25 discharged from the hose, the quality of grout 25 filled in duct 3 can be checked.Fifth Step

[0153] In fifth step S5, a filled state of grout 25 filled in main body portion 40 of duct component 30 (see FIG. 6) is checked after fourth step S4. The filled state of grout 25 can be checked from first cylindrical portion 50a, for example, as described above.

[0154] In fifth step S5, the filled state of grout 25 filled in main body portion 40 may be shot with a camera (not shown), and a shot image may be recorded in a recording medium (not shown). By shooting the filled state of grout 25 with the camera and recording the shot image in the recording medium, it is possible to utilize it for quality assurance. Further, for example, by transmitting image data from the camera to a recording medium at a remote location and displaying the image on a display, the filled state of grout 25 can be checked from the remote location. The recording medium is a memory, for example.Other StepsSixth Step

[0155] When filling of grout 25 is insufficient in fifth step S5, a sixth step S6 of reinjecting grout 25 may be included. For example, lid portion 60 of first cylindrical portion 50a is removed, and grout 25 is reinjected from first cylindrical portion 50a. Seventh Step

[0156] Furthermore, the method for constructing the concrete structural body may include a seventh step S7 of taking out grout 25 filled in at least one cylindrical portion 50 after grout 25 is cured, and performing the performance test of grout 25. For example, second cylindrical portion 50b is removed from main body portion 40, and grout 25 in second cylindrical portion 50b is taken out. As described above, the performance test of grout 25 evaluates whether at least one of density, strength, and alkalinity of the grout satisfies a predetermined performance, for example.

[0157] It should be noted that the present invention is not limited to these examples, but is defined by the scope of the claims, and is intended to include any modifications within the scope and meaning equivalent to the scope of the claims. The concrete structural body in the present invention is not limited to a main beam, and may be any concrete structural body having an outer cable.REFERENCE SIGNS LIST1 outer cable

[0159] 1b bottom portion

[0160] 1t top portion

[0161] 2 PC steel material

[0162] 3 duct

[0163] 3a first region

[0164] 20 PC strand

[0165] 25 grout

[0166] 30 duct component

[0167] 31 first duct unit

[0168] 32 second duct unit

[0169] 40 main body portion

[0170] 40a outer circumferential surface

[0171] 41 first coupling end

[0172] 42 second coupling end

[0173] 45 opening

[0174] 50 cylindrical portion

[0175] 50a first cylindrical portion

[0176] 50b second cylindrical portion

[0177] 51 first end portion

[0178] 52 second end portion

[0179] 60 lid portion

[0180] 60h through hole

[0181] 80 heating wire

[0182] 100 concrete structural body

[0183] 110 main beam

[0184] 111 upper floor plate

[0185] 112 lower floor plate

[0186] 113 web

[0187] 114 cross beam

[0188] 114c intermediate cross beam (first support portion)

[0189] 114e end cross beam (first support portion)

[0190] 115 deflection portion (second support portion)

[0191] 120 bridge pier

[0192] 200 fixture

[0193] S1 first step

[0194] S2 second step

[0195] S3 third step

[0196] S4 fourth step

[0197] S5 fifth step

[0198] S6 sixth step

[0199] S7 seventh step

Claims

1. A concrete structural body having an outer cable, whereinthe outer cable includes a duct having a duct component,the duct component hasa main body portion into which a PC steel material is inserted and a grout is filled,at least one cylindrical portion protruding outward from an outer circumferential surface of the main body portion, anda lid portion provided to the at least one cylindrical portion,the at least one cylindrical portion hasa first end portion connected to the main body portion, anda second end portion provided with the lid portion,the at least one cylindrical portion protrudes in an upward direction from the outer circumferential surface of the main body portion, anda position of the second end portion of the at least one cylindrical portion is higher than a position of the duct located at a top portion of the outer cable.

2. The concrete structural body according to claim 1, whereinthe at least one cylindrical portion includes a plurality of cylindrical portions,the plurality of cylindrical portions have a first cylindrical portion and a second cylindrical portion, andthe first cylindrical portion and the second cylindrical portion are provided in directions orthogonal to each other with respect to a longitudinal axis of the main body portion.

3. The concrete structural body according to claim 2, wherein the plurality of cylindrical portions are disposed with a spacing therebetween along the longitudinal axis of the main body portion.

4. The concrete structural body according to claim 1, wherein the first end portion is detachably coupled to the main body portion.

5. The concrete structural body according to claim 4, wherein the first end portion and the main body portion are coupled by a threaded structure.

6. The concrete structural body according to claim 1, wherein the at least one cylindrical portion is constituted by a transparent resin.

7. The concrete structural body according to claim 1, wherein the lid portion is constituted by a transparent resin.

8. The concrete structural body according to claim 1, wherein the main body portion is constituted by a transparent resin.

9. The concrete structural body according to claim 1, wherein the lid portion has a through hole to which a hose is attached.

10. The concrete structural body according to claim 1, wherein the duct component is a coupler that couples a first duct unit constituting the duct and a second duct unit constituting the duct.

11. (canceled)12. The concrete structural body according to claim 1, whereinthe duct further includes a duct unit,the duct component is coupled to the duct unit, andthe main body portion of the duct component and the duct unit are connected by welding.

13. (canceled)14. The concrete structural body according to claim 1, whereinthe at least one cylindrical portion includes a plurality of cylindrical portions,the plurality of cylindrical portions have a first cylindrical portion and a second cylindrical portion,the first cylindrical portion protrudes in the upward direction from the outer circumferential surface of the main body portion, andthe second cylindrical portion protrudes in a horizontal direction from the outer circumferential surface of the main body portion.

15. The concrete structural body according to claim 1, whereinthe outer cable is installed so as to have undulations with respect to the concrete structural body,the concrete structural body has a first support portion that supports a the top portion of the outer cable, and a second support portion that supports a bottom portion of the outer cable,the duct includes a first region close to the first support portion, andthe duct component is provided in the first region.

16. (canceled)17. A method for constructing the concrete structural body according to claim 1, the method comprising:inserting a PC steel material into the duct;tensioning the PC steel material, after the inserting of the PC steel material;filling a grout into the main body portion of the duct component, after the tensioning of the PC steel material; andchecking a filled state of the grout filled in the main body portion of the duct component, after the filling of the grout.

18. The method for constructing the concrete structural body according to claim 17, wherein, when filling of the grout is insufficient in the checking of the filled state of the grout, the grout is reinjected from the at least one cylindrical portion.

19. The method for constructing the concrete structural body according to claim 17, whereinin the filling of the grout, the grout is filled into the at least one cylindrical portion, andthe method comprises taking out the grout filled in the at least one cylindrical portion, and performing a performance test of the grout.

20. The method for constructing the concrete structural body according to claim 17, wherein, in the checking of the filled state of the grout, the filled state of the grout filled in the main body portion is shot with a camera, and a shot image is recorded in a recording medium.

Images