Joint structure of concrete members

Abstract

To provide a joint structure of concrete members capable of securing shearing resistance in the joint structure of the adjacent concrete members.SOLUTION: In a joint structure of the concrete member including a pair of wall balustrades 1,1, pipe bodies 6,6 respectively buried in the pair of wall balustrades 1,1, and a connecting pipe 14 for connecting pipe ends 12T, 12T of the pipe bodies 6,6 of the pair of wall balustrades 1,1, a bottomed recessed part 22 having an end face opening part 23 and an upper face opening part 24 is provided at an end part in the longitudinal direction of the wall balustrade 1. Since the pipe end 12T, 12T and the connecting pipe 14 are embedded in the solidifying material 46 filling the adjacent and continuous recessed parts 22,22 in a state where the pipe end 12T protrudes from the inside of the recessed part 22 and the end surface opening parts 23,23 of the pair of wall balustrades 1,1 are aligned with each other, a solidifying material 46 filling the continuous recessed parts 22,22 acts as a shear key and can resist a shear force generated between the adjacent wall balustrades 1,1.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a joint structure for concrete members. [Background technology]

[0002] Conventionally, precast concrete members (e.g., Patent Document 1) that constitute wall parapets, bridge girders, deck slabs, retaining walls, underground structures, and various other civil engineering structures have been known to use this type of joint structure.

[0003] Furthermore, the method of connecting pipes to be buried in concrete members in Patent Document 1 above includes a first cylindrical pipe to be buried in a first concrete member and a second cylindrical pipe to be buried in a second concrete member, the first pipe and the second pipe are connected by a cylindrical intermediate pipe (corresponding to a connecting pipe), and a cable or the like is inserted through the first and second pipes.

[0004] In addition, a structure has been described in which buried pipes inside a precast concrete wall are connected to each other by a tubular relay member (corresponding to a connecting pipe), and power and communication lines such as power cables, telephone lines, CATV cables, and cable broadcasting cables are inserted into the connected buried pipes, and the relay member is inserted into the end of the buried pipe, and the end of the buried pipe is inserted into the relay member (for example, Patent Document 2).

[0005] In the above Patent Documents 1 and 2, in the joint structure of concrete members in which pipes are buried to pass cables, etc., the ends of the pipes are connected by an intermediate pipe, but because the pipes are made of polyvinyl chloride electrical conduit, etc., they are insufficient to withstand the shear strength applied to the joint.

[0006] For this reason, there is a connecting structure (Patent Document 3) for connecting the upper parts of multiple concrete members lined up in the direction of the road, in which insertion holes are provided in the guard fence blocks (wall parapets) that penetrate in the longitudinal direction, and prestressing steel members are inserted between multiple guard fence blocks through these insertion holes, with the tension generated fastening the guard fence blocks together. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2022-48620 [Patent Document 2] Patent Publication No. 2021-188492 [Patent Document 3] Japanese Patent Application Laid-Open No. 2008-95363 Summary of the Invention [Problem to be solved by the invention]

[0008] In Patent Document 3, the tops of the guard fence blocks are fastened together with prestressing steel members, which makes it possible to withstand the shear force acting on the joints of adjacent guard fence blocks. However, this requires space above the blocks to allow the prestressing steel members to pass through, and so it is not possible to bury a pipe for passing cables or the like above the blocks, as in Patent Documents 1 and 2.

[0009] The problem to be solved is to provide a joint structure for concrete members that can ensure shear resistance in a joint structure for adjacent concrete members. [Means for solving the problem]

[0010] The invention of claim 1 is a joint structure for concrete members comprising a pair of precast concrete members, pipe bodies embedded in each of the pair of concrete members, and connecting pipes connecting the pipe ends of the pipe bodies of the pair of concrete members, characterized in that a bottomed recess having an end face opening and an upper face opening is provided at the longitudinal end of the concrete members, the pipe ends protrude from the recess, and the pipe ends and the connecting pipe are embedded in solidifying material filled in adjacent consecutive recesses with the end face openings of the pair of concrete members aligned.

[0011] The invention of claim 2 is characterized in that the connecting pipe and the pipe end side of the pipe body are made of steel.

[0012] The invention of claim 3 is characterized in that the pipe end is inserted into the connecting pipe for connection.

[0013] The invention of claim 4 is characterized in that an annular elastic water-stopping member is provided at the end of the pipe, and this elastic water-stopping member abuts the inner surface of the connecting pipe and has an enlarged portion that expands toward the tip, and the tip of this enlarged portion has a diameter larger than the inner diameter of the connecting pipe. [Effects of the Invention]

[0014] According to the configuration of claim 1, the solidification material filled in the continuous recesses acts as a shear key, and can resist the shear force generated between adjacent concrete members. Also, there is no need to provide a member to ensure shear resistance between the tops of adjacent concrete members, and communication lines and the like can be inserted into the pipes placed in the recesses.

[0015] Furthermore, according to the configuration of claim 2, it is possible to improve the shear resistance.

[0016] Furthermore, according to the configuration of claim 3, the pipe ends can be connected to each other by inserting the pipe ends into the connecting pipe.

[0017] Furthermore, according to the configuration of claim 4, the expanded portion abuts against the inner surface of the connecting pipe, thereby ensuring watertightness between the pipe body and the connecting pipe, and the elastic deformation of the expanded portion makes it possible to adjust the angle between adjacent concrete members. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a cross-sectional view showing a first embodiment of the present invention. [Figure 2] FIG. 10 is a cross-sectional view of the anchor hole. [Figure 3] FIG. 10 is an enlarged cross-sectional view of the anchor hole. [Figure 4] FIG. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. 1 is a plan view of a longitudinal end of a concrete member. [Figure 8] FIG. [Figure 9] FIG. 10 is a cross-sectional view showing the elastic water-stopping member in the same as above in a mounted state. [Figure 10] FIG. 10 is a front view illustrating the construction of the concrete member. [Figure 11] FIG. [Figure 12] FIG. 10 is a side view illustrating the removal of the central member of the punching die. [Figure 13] FIG. [Figure 14] FIG. 10 is a cross-sectional view of the upper part of the die with the fixing member attached thereto. [Figure 15] 15A is a plan view, FIG. 15B is a front view, and FIG. 15C is a bottom view of the central member. [Figure 16] 16A and 16B show the outer member, with FIG. 16A being a side view and FIG. 16B being a front view. [Figure 17] FIG. 10 is a cross-sectional view of the lower part of the die. [Figure 18] FIG. 10 is a cross-sectional view of the lower part of the central member. DETAILED DESCRIPTION OF THE INVENTION

[0019] Preferred embodiments of the present invention will be described with reference to the accompanying drawings. Note that the following examples do not limit the scope of the present invention as defined in the claims. Furthermore, not all of the configurations described below are necessarily essential requirements for the present invention. [Example]

[0020] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Figures 1 to 18 show a first embodiment of the present invention, in which a concrete member, a balustrade 1, is made of precast concrete with a shape in which the thickness increases slightly downward, and reinforcing bars (not shown) are arranged inside. One side surface 2 in the thickness direction of the balustrade 1 is formed into a flat inclined surface with a horizontal inclination angle θ of between 75 degrees and 90 degrees, and the other side surface 3 in the thickness direction is formed into a vertical surface.

[0021] As shown in FIG. 1, a leg 4 protruding laterally is provided at the bottom of one side surface 2, and this leg 4 has a vertical surface 4B below an inclined surface 4A.

[0022] The parapet 1 is provided at the end of the road R, and in this example, the road R is formed by a concrete slab 5 of a bridge or the like that forms the foundation, and the parapet 1 is provided at the end of the upper surface 5A of the concrete slab 5, and a vertical end face 5B is formed at the end of the concrete slab 5. Then, the one side surface 2 faces the road R, and the other side surface 3 faces the opposite side of the road R, and multiple parapets 1, 1... are arranged side by side in the length direction of the road R.

[0023] At the center of the width of the wall balustrade 1, a plurality of pipe bodies 6, 6 are provided in two rows on the upper side, and a plurality of pipe bodies 7, 7, 7, 7 are provided vertically in four rows below these pipe bodies 6, 6, and various cables etc. are inserted into the pipe bodies 6 and 7.

[0024] As shown in Figure 4, the two upper and lower pipe bodies 6 have a central pipe body 11 at the center in the longitudinal direction made of a non-metallic synthetic resin or the like, which is a hard vinyl electrical conduit, and both ends of the length of the pipe body 6 are made of steel pipes 12, 12 which serve as end-side pipes, and the pipe body 11 and steel pipe 12 are connected by dissimilar pipe joints 13.

[0025] The pipe 7 has a smaller diameter than the pipe 11. In this case, the area of ​​the pipe 6 that is expected to be affected by the collision load is the steel pipe 12, which has a greater strength than the pipe 11 at the center in the longitudinal direction.

[0026] The end face portion 21 in the length direction of the balustrade 1 is formed vertically, and a recess 22 that is approximately U-shaped in plan view and has a bottom is provided at the top of this end face portion 21, corresponding to the pipe body 6. As shown in Figures 4 and 5, the recess 22 has an end face opening 23 that opens into the end face portion 21 at the center side in the width direction of the end face portion 21, and an upper face opening 24 that opens into the upper face portion 1A of the balustrade 1.

[0027] Furthermore, within the recess 22, a vertical recess end surface portion 25 from which the pipe end 12T of the steel pipe 12 protrudes is provided opposite the end surface opening 23, and at the bottom of the recess 22, a substantially horizontal recess under surface portion 26 is provided opposite the upper surface opening 24, and this recess under surface portion 26 is located between the second steel pipe 12 from the top and the pipe body 7 below it.

[0028] The recess 22 has a pair of inner surfaces 27, 27 on both sides in the width direction, and as shown in Figure 6, the distance between these pair of inner surfaces 27, 27 increases slightly from the recess end surface 25 toward the end surface opening 23. The pipe end 12T of the steel pipe 12 is housed in the recess 22, and the steel pipe 12 integrally has a portion embedded in the wall parapet 1 and a portion protruding into the recess 22.

[0029] As shown in Figures 8 and 9, a gasket material 31, which is an elastic water-stopping member made of an elastic material such as rubber, is attached to the pipe end 12T of the steel pipe 12 stored in the recess 22, and a steel connecting pipe 14 is fitted onto the pipe end 12T equipped with this gasket material 31, and this connecting pipe 14 connects the pipe ends 12T, 12T of adjacent wall balustrades 1, 1 to each other.

[0030] The packing material 31 comprises a ring-shaped mounting cylinder 33 having a mounting groove 32 that fits onto the pipe end 12T, and the mounting cylinder 33 has an outer cylindrical portion 34 and an inner cylindrical portion 35 whose tips are closed by closing portions 36, forming the mounting groove 32 between the outer cylindrical portion 34 and the inner cylindrical portion 35, with the mounting groove 32 opening at the base end.

[0031] The outer cylindrical portion 34 is thicker than the inner cylindrical portion 35, and an enlarged portion 37 that tapers toward the base end is integrally formed at the base end of the outer cylindrical portion 34, and a tip surface 37S of the enlarged portion 37 is located on a plane perpendicular to the central axis of the packing material 31. The enlarged portion 37 enlarges at an angle θ1 in the range of 35 degrees to 55 degrees with respect to the central axis of the packing material 31, and the outer periphery of the tip surface 37S has the maximum diameter.

[0032] The inner diameter of the connecting pipe 14 is larger than the outer diameter of the mounting cylinder 33 and smaller than the maximum diameter of the expanded portion 37 .

[0033] 1 and 4, a plurality of height adjustment bolts 41 are threaded onto the underside of the wall railing 1. Furthermore, as shown in Fig. 4, a plurality of lifting insert nuts 48 serving as lifting sections are vertically installed on the upper part of the wall railing 1, and the wall railing 1 can be lifted by threading the male threads of a lifting tool (not shown) into these insert nuts 48 and lifting a cable (not shown) connected to the lifting tool.

[0034] 7, one end of the connecting pipe 14 is fitted onto the pipe end 12T of the steel pipe 12 of one of the adjacent wall parapets (left side in FIG. 10), and one end of this connecting pipe 14 is abutted against the recessed end surface 25 of one of the wall parapets 1. In this way, the other end of the connecting pipe 14 protrudes a predetermined distance from the end surface 21 of one of the wall parapets 1. In addition, a joint packing 42 is attached below the recessed portion 22 to the end surface 21 of one of the adjacent wall parapets 1 by adhesive or the like, and this joint packing 42 has a communication hole 43 (FIG. 4) drilled therein that communicates with the pipe body 7.

[0035] Next, as shown in Figure 10, one wall railing 1 is hung next to the other wall railing 1 to which the connecting pipe 14 has been attached, and its height is adjusted using the height adjustment bolt 41.The other wall railing 1 is then slid closer to the one wall railing 1, and the pipe end 12T of the steel pipe 12 of the other wall railing 1 is inserted and connected to the connecting pipe 14, and a joint gasket 42 is clamped between the end surfaces 21, 21 of both wall railings 1, 1.

[0036] In this state, there is a gap 38 (Figure 5) between the inner surface 37N of the expanded portion 37 of the packing material 31 and the outer surface of the pipe end 12T of the steel pipe 12, and the angle between adjacent steel pipes 12, 12 can be adjusted by the amount of this gap 38, and the orientation of one wall balustrade 1 relative to the other wall balustrade 1 can be adjusted.

[0037] Furthermore, since the adjustable angle is only small enough to accommodate the curvature of the road R, the joint packing 42 at the bottom of the recess 22 can deform to absorb the change in angle.

[0038] In this way, a joint 44 is formed between the end surfaces 21, 21 of adjacent wall parapets 1, 1 by the joint packing 42, and by aligning the end surfaces 21, 21, a filling space 45 is formed in which adjacent recesses 22, 22 are connected by the joint 44. With adjacent pipe ends 12T, 12T connected by the connecting pipe 14, a cement-based filling solidification material 46 such as non-shrink mortar is filled into the filling space 45, and the filling solidification material 46 hardens within the filling space 45 to form a key member 47. Before solidification, the filling solidification material 46 has fluidity that allows it to be filled into the filling space 45, etc., and it hardens over time. Furthermore, as shown in Figures 5 and 6, the gap between the inner circumference of the connecting pipe 14 and the outer circumference of the steel pipe 12 is filled with solidification material 46 from the end of the connecting pipe 14, and the packing material 31 prevents the solidification material 46 from penetrating into the inside of the connecting pipe 14 and the steel pipe 12.

[0039] In addition, the joint packing 42 prevents the solidifying material 46 from entering the pipe 7, and adjacent pipes 7, 7 communicate with each other through the communication holes 43.

[0040] In the joint structure of concrete members as described above, the upper and lower pipe ends 12T, 12T and connecting pipe 14 in the filled space 45 act as joints that transmit the shear force between the adjacent parapets 1, 1, and can withstand the shear force between the parapets 1, 1 when subjected to a collision load or the like, and furthermore, key members 47 made of filling solidification material 46 filled in the filled space 45 where the pipes 11, 11 connect with each other withstand the shear force between the parapets 1, 1. For this reason, there is no need to provide connecting members or the like to withstand the shear force applied to the top of the parapets 1, 1, and more pipes 6, 7 can be installed than before.

[0041] Next, the mounting structure between the concrete slab 5, which is the member to be mounted, and the wall parapet 1, which is the concrete member, will be described.

[0042] Anchor members 51 are provided for attaching the balustrade 1 to the concrete slab 5, and a plurality of these anchor members 51 are provided on the slab 5 at intervals along the length of the slab 5. These anchor members 51 are made of reinforcing bars or the like, and the upper ends of a pair of vertical reinforcing bars 52, 52 are connected by an upper horizontal reinforcing bar 53 in the length direction of the balustrade 1, and lower horizontal reinforcing bars 54, 54 in the width direction of the balustrade 1 are integrally provided at the lower ends of the pair of vertical reinforcing bars 52, 52, and the lower sides of the vertical reinforcing bars 52, 52 and the lower horizontal reinforcing bars 54, 54 are embedded and fixed in the concrete slab 5, and the remaining upper parts protrude upward from the upper surface 5A of the concrete slab 5.

[0043] As shown in Figure 4, the balustrade 1 is provided with a plurality of anchor holes 61 into which the anchor members 51 are loosely inserted, and these anchor holes 61 are groove-shaped and long in the length direction of the balustrade 1, opening into the underside 1B of the balustrade 1. The distance between the end faces 62, 62 on both sides in the length direction of the anchor hole 61 widens slightly downward. As shown in Figure 4, a plurality of (two) anchor members 51 are inserted into the anchor holes 61.

[0044] The anchor hole 61 has a cross section of the same shape along the length of the wall balustrade 1, and as shown in Figure 3, it comprises an upper surface portion 63, an expanding portion 65 which gradually expands downward from both sides of the upper surface portion 1A, a contracting portion 66 which gradually contracts from the lower end of this expanding portion 65 towards the lower surface portion 1B of the wall balustrade 1, and a lower opening 67 which is provided at the lower end of this contracting portion 66 and opens into the lower surface portion 1B of the wall balustrade 1, and a chamfered portion 68 is formed at the corner of this lower opening 67.

[0045] The corner of the lower opening 67 is the corner of the reduced portion 66 and the lower surface portion 1B. The expanded portion 65 is a portion where the distance between the inner peripheral surfaces on both sides of the anchor hole 61 in the width direction increases downward, and the reduced portion 66 is a portion where the distance between the inner peripheral surfaces on both sides of the anchor hole 61 in the width direction decreases downward.

[0046] The wall balustrade 1 is provided with a plurality of lateral injection holes 69 that communicate between the reduced portions 66 of the anchor holes 61 and the other side surface portion 3. The wall balustrade 1 also has a plurality of discharge holes 70 that communicate between the upper ends of the anchor holes 61 and the other side surface portion 3.

[0047] The anchor holes 61 are formed by a punch 71 placed in the molding form 8 of the wall balustrade 1, and since the molding form 8 is upside down compared to the wall balustrade 1, the upper surface 8J of the molding form 8 becomes the lower surface 1B of the wall balustrade 1. Below, the top and bottom of the punch 71 will be explained based on the state in which it is placed in the molding form 8.

[0048] 11 to 18, the steel die 71 includes a die central member 72 that divides the anchor hole 61 into three sections in the width direction, and die outer members 73, 73 that are arranged on both sides of the central member 72 in the width direction, and when assembled, forms an anchor hole molding portion 74 that has the same shape as the anchor hole 61. The anchor hole molding portion 74 is the portion that is arranged inside the formwork 8 of the wall balustrade 1.

[0049] The central member 72 has a central plate portion 81 located in the widthwise center of the anchor hole 61, and central end face portions 82, 82 at both longitudinal ends of the central plate portion 81, the spacing between which gradually narrows toward the bottom, and the central end face portions 82, 82 on both sides are formed so that the spacing between them gradually narrows toward the bottom.

[0050] A central upper surface portion 83 of a constant width made of a flat bar or the like is provided on the upper edge of the central plate portion 81, and a central lower surface portion 84 of a constant width made of a flat bar or the like is provided on the lower edge of the central plate portion 81, and the longitudinal ends of these central upper surface portion 83 and central lower surface portion 84 are fixed to the central end surface portions 82, 82. The central portion of the upper surface portion 63 of the anchor hole 61 in the width direction is formed by the central lower surface portion 84.

[0051] The outer plate 91 of the outer member 73 is a plate-like member integrally including, from above, an extension portion 92, a flat-plate-shaped reduction molding portion 93 that molds the reduction portion 66, a flat-plate-shaped expansion molding portion 94 that molds the expansion portion 65, and an upper surface molding portion 95 that molds a portion of the upper surface 63 of the anchor hole 61. An outer end surface 96 that molds a portion of the end surface 62 of the anchor hole 61 is provided at each end of the outer plate 91 in the longitudinal direction. An internal rib plate 97 having substantially the same shape as the outer end surface 96 is provided on the inner surface of the central portion of the outer plate 91 in the longitudinal direction. The end surface 62 of the anchor hole 61 is molded by the central end surface 82 and the outer end surface portions 96, 96 on both sides in the width direction. The inner surfaces of the reduction portion 66 and the expansion portion 65 on both sides in the width direction are formed flat.

[0052] 17 and other figures, chamfered inclined surfaces 84K, 84K are formed on both sides of the lower part in the thickness direction of the central lower surface portion 84, and the distance between the inclined surfaces 84K, 84K on both sides in the thickness direction is formed so as to widen toward the top. Inclined surfaces 95K, 95K that abut against these inclined surfaces 84K, 84K are formed on the inner edge of the upper surface molded portions 95, 95. The inclined surface 95K is inclined at the same angle as the inclined surface 84K.

[0053] Then, as shown in Figures 11 and 12, the inner edge portions 96U, 96U of the outer end surface portions 96, 96 of the outer members 73, 73 are butted against the outer edge portions 82S, 82S on both sides of the central end surface portion 82 of the central member 72, and the inclined surfaces 95K, 95K of the upper surface molding portions 95, 95 of the outer members 73, 73 are abutted against the inclined surfaces 84K, 84K on both widthwise sides of the central lower surface portion 84 of the central member 72, thereby assembling the punching die 71.

[0054] Nuts 98, which serve as bolt abutments for assembly, are fixed to the inner surfaces of the extensions 92, 92 of the outer members 73, 73 on both sides, and the nuts 98 are arranged in the center and on both sides in the longitudinal direction, as shown in Figure 16. As shown in Figure 14, the outer part 75 of the formwork is provided with fixing means 131 for assembling and fixing the central member 72 and the outer members 73, 73 in a bundled state.

[0055] 14, the fixing means 131 includes a jig 132 serving as a fixing member for clamping the outer form portion 75 in a bundled state, and the jig 132 has a generally U-shaped cross section and includes a horizontal rod portion 133 arranged above the outer form portion 75 in the width direction of the die 71, and vertical rod portions 134 hanging down from both ends of the horizontal rod portion 133 and arranged on the outer surface side of the outer members 73, 73. The lower ends of the vertical rod portions 134 are placed on the upper surface portions 105J of the protrusions 105. The jig 132 may be the same length as the die 71, or may be provided in three locations corresponding to the nuts 98.

[0056] A female screw portion 133N is provided vertically in the widthwise center of the horizontal rod portion 133, and a vertical bolt 135 is threaded into this female screw portion 133N. Furthermore, female screw portions 134N are provided on the left and right vertical rod portions 134, 134 corresponding to the positions of the nuts 98, 98, and horizontal bolts 136, 136 are threaded into these left and right female screw portions 134N, 134N, respectively. Then, with the lower end of the vertical rod portion 134 placed on the upper surface portion 105J of the protrusion 105, the bolts 136, 136 are screwed toward the center to clamp the central member 72, and the bolt 135 is screwed into a predetermined position to determine the height of the central member 72. The tips of the left and right bolts 136, 136 are in pressure contact with the left and right nuts 98, 98, and the bolts 136 are not threaded into the nuts 98.

[0057] 15(B), a plurality of lifting nuts 101 serving as lifting sections are vertically disposed on the underside of the central upper surface section 83 of the central member 72, and through holes 102 (FIG. 13) are bored in the central upper surface section 83 corresponding to the nuts 101. Male threads of a lifting tool (not shown) are threaded into the nuts 101 through the through holes 102, and a cable (not shown) connected to the lifting tool is lifted, thereby lifting the central member 72 upward and removing it from the mold. In order to attach the nuts 101 to the central upper surface section 83, recesses are formed in the upper edge of the central plate section 81 to accommodate the nuts 101.

[0058] In addition, between the extension portion 92 and the reduced molding portion 93, the protrusion 105 having a triangular cross section is provided on the outer surface along the entire length of the outer member 73, and since the upper surface 105J of this protrusion 105 is located at the position of the lower surface 1B of the wall balustrade 1, the extension portion 92 protrudes upward from the upper surface 8J of the formwork 8.

[0059] The protrusion 105 is provided with a sloped surface 105S that forms the chamfered portion 68 of the anchor hole 61. In the punching die 71, the portion below the upper surface 105J of the protrusion 105 is the anchor hole forming portion 74, and the portion above the upper surface 105J is the outside-of-form portion 75 that protrudes from the upper surface 8J of the molding form 8.

[0060] The following describes the configuration of the injection hole 69. Two connecting tube portions 106 are provided on the inner surface of the reduced molding portion 93 of the outer surface plate 91 of one of the outer members 73, spaced apart in the longitudinal direction, and through holes 93T communicating with these connecting tube portions 106 are drilled in the reduced molding portion 93.

[0061] Then, the base end 107K (Fig. 3) of an injection pipe 107 made of synthetic resin or the like is inserted and connected into the through hole 93T and the connecting tube portion 106, a socket pipe 108 having a larger diameter is connected to the tip of this injection pipe 107, and the tip of this socket pipe 108 is positioned on the other side surface portion 3 of the formwork 8 and fixed in position to the formwork 8, and then concrete is filled into the formwork 8. The injection pipe 107 and socket pipe 108 form the injection hole 69.

[0062] The configuration of the discharge hole 70 will now be described. A plurality of cylindrical connecting protrusions 111 are provided on the underside of the lower plate 84 of the central member 72 at intervals in the longitudinal direction, and in this example, they are provided at two positions corresponding to the connecting cylindrical portions 106, 106, and at two positions at both ends in the longitudinal direction. As shown in Figure 18, the connecting protrusions 111 are integrally provided with mounting cylindrical portions 111A having a smaller diameter than the connecting protrusions 111. This mounting cylindrical portion 111A is inserted into the through-hole 84T of the central lower surface portion 84, and is fixed to the upper surface of the central lower surface portion 84 and the notched lower edge of the central plate portion 81.

[0063] Then, the lower end of a vertical pipe 112 is connected to the connecting protrusion 111, one end of a 90-degree elbow 113 is connected to the upper end of the vertical pipe 112, the base end of a horizontal pipe 114 is inserted and connected to the other end of the elbow 113, a larger diameter socket pipe 115 is connected to the tip of the horizontal pipe 114, the tip of the socket pipe 115 is positioned on the other side portion 3 of the formwork 8, and after it has been fixed in position to the formwork 8, concrete is filled into the formwork 8.

[0064] The discharge hole 70 is formed by the vertical pipe 112, elbow 113, horizontal pipe 114, and socket pipe 115, which are made of synthetic resin or the like. The horizontal pipe 114 is disposed between the second and third pipes 7 from the top.

[0065] Next, we will explain the molding (manufacturing) method of the wall balustrade 1. After the punch 71, injection hole 69, and discharge hole 70 are placed in the molding formwork 8 of the wall balustrade 1, the molding formwork 8 is filled with concrete and cured. After curing, the fixing means 131 is removed and the central member 72 is pulled upward, whereupon the connecting projection 111 at the lower end comes out of the vertical pipe 112 of the injection hole 69, and the shape of the central member 72 which narrows downward allows the central member 72 to be smoothly pulled out.

[0066] When the central member 72 is pulled out, a space is created in the widthwise center of the die 71, and the extension 92 is used to tilt the other outer member 73 diagonally toward the center. In this case, because a concrete release agent was applied to the outer surface of the outer panel 91 before filling it with concrete, it can be removed smoothly from the concrete surface. After tilting it and removing it from the concrete surface, the other outer member 73 is pulled out upward.

[0067] After the central member 72 and the other outer member 73 have been pulled out in this manner, one outer member 73 is pulled out in the same manner as the other outer member 73. At this time, because there is a relatively large space after the central member 72 and the other outer member 73 have been pulled out, by tilting one outer member 73 at an angle, it is possible to pull out the base end 107K of the injection tube 107 from the connecting tube portion 106, and then pull out the one outer member 73 upward, opening the anchor hole 61.

[0068] As shown in Figure 4, two anchor members 51, 51 are loosely inserted into one anchor hole 61, and in the installed state, a gap 121 (Figure 10) is provided between the end face portion 62 of the anchor hole 61 and the adjacent anchor member 51, allowing the wall balustrade 1 to slide in the lengthwise direction by the amount of this gap 121. In addition, the thickness of the anchor member 51 is narrower than the width of the anchor hole 61, and the anchor member 51 is loosely inserted into the anchor hole 61.

[0069] Then, as shown in Figure 10, the other wall railing 1 is slid closer to the one wall railing 1, and the pipe end 12T of the steel pipe 12 of the other wall railing 1 is inserted and connected to the connecting pipe 14, and the joint gasket 42 is clamped between the end face portions 21, 21 of both wall railings 1, 1, and if necessary, the angle between adjacent steel pipes 12, 12 is adjusted to position them.

[0070] After positioning, the area around the joint 122 between the lower surface 1B of the wall parapet 1 and the upper surface 5A of the concrete floor slab 5 is sealed with a formwork plate (not shown) to prevent leakage of the filling solidification material 109 from the joint 122, and then an external filling pipe such as a hose is connected to the receiving pipe 108 of the injection hole 69, and the filling solidification material 109 such as mortar is filled from this filling pipe.

[0071] The filled solidification material 109 is filled into the joint portion 122, and the air inside the joint portion 122 is discharged to the outside through the anchor hole 61 and the discharge hole 70, allowing the solidification material 109 to be smoothly filled into the anchor hole 61 and the discharge hole 70.

[0072] In addition, one end of a flexible hose (not shown) is connected to the receiving pipe 115 of the discharge hole 70, the other end of the hose is pointed upward, and air is discharged from the other end.When air is no longer being discharged and the hose contains solidification material 109 that does not contain air, the other end of the hose is closed and the hose is fixed in position.When the filling solidification material 109 such as non-shrink mortar has hardened, the hose is cut off from the side portion 3 along with the hardened solidification material 109.

[0073] In the mounting structure at the bottom of multiple balustrades 1, 1... manufactured in this manner and installed side by side, anchor members 51 are inserted into anchor holes 61 whose cross-sectional area decreases downward, and the solidifying material 109 filled in the anchor holes 61 hardens, so even if a pulling force is applied to the anchor members 51 due to the impact force of a vehicle collision or the like, the anchor members 51 are restrained by the anchor holes 61 which decrease downward, thereby increasing resistance, and in the joint structure at the top of multiple balustrades 1, 1... installed side by side, the pipe ends 12T, 12T at the top and bottom of the filled space 45 and the connecting pipe 14 act as joints that transmit the shear force of adjacent balustrades 1, 1, and can withstand the shear force between the balustrades 1, 1 when subjected to a collision load or the like.

[0074] As described above, in this embodiment, corresponding to claim 1, a joint structure of concrete members is provided with a pair of precast concrete balustrades 1, 1, pipe bodies 6, 6 embedded in the pair of wall balustrades 1, 1, respectively, and a connecting pipe 14 connecting pipe ends 12T, 12T of the pipe bodies 6, 6 of the pair of wall balustrades 1, 1, and the end of the wall balustrade 1 in the longitudinal direction has an end opening 23 and an upper opening 24. A bottomed recess 22 is provided, the pipe ends 12T protruding from the recess 22, and the end face openings 23, 23 of the paired wall balustrades 1, 1 are aligned. The pipe ends 12T, 12T and connecting pipe 14 are embedded in solidifying material 46 filled in adjacent consecutive recesses 22, 22, so that the solidifying material 46 filled in the consecutive recesses 22, 22 acts as a shear key and can resist the shear force generated between the adjacent wall balustrades 1, 1.

[0075] Furthermore, there is no need to provide a member to ensure shear resistance between the upper portions of adjacent wall parapets 1, 1, and communication lines or the like can be inserted into the pipes 6, 6 arranged in the recesses 22, 22 for use.

[0076] As described above, in this embodiment, in accordance with claim 2, the connecting pipe 14 and the pipe end 12T side of the pipe body 6 are made of steel, so that the shear resistance can be improved in the joint structure.

[0077] In this embodiment, in accordance with claim 3, the tube end 12T is inserted into the connecting tube 14, so that the tube ends 12T can be inserted into the connecting tube 14 to connect the tube ends 12T, 12T together.

[0078] In this embodiment, corresponding to claim 4, a packing material 31 which is an annular elastic water-stopping member is provided at the pipe end 12T, and this packing material 31 is provided with an enlarged portion 37 which abuts against the inner surface of the connecting pipe 14 and expands towards the tip, and the tip of this enlarged portion 37 has a diameter larger than the inner diameter of the connecting pipe 14, so that the abutment of the enlarged portion 37 against the inner surface of the connecting pipe 14 ensures the watertightness of the steel pipe 12 which is the pipe body and the connecting pipe 14, and the elastic deformation of the enlarged portion 37 makes it possible to adjust the angle between adjacent wall balustrades 1, 1.

[0079] The effects of the embodiment are as follows: in this embodiment, anchor members 51 are provided in the concrete slab 5, which is the member to be attached, anchor holes 61 into which these anchor members 51 are inserted are provided in the balustrade 1, which is a precast concrete member, and anchor holes 61 with anchor members 51 inserted are filled with solidifying material 109 to attach the balustrade 1 to the slab 5. In this concrete member attachment structure, the cross section of the anchor holes 61 decreases in the direction opposite to the insertion of the anchor members 51, so that the anchor members 51 are embedded in the solidified material 109 in the anchor holes 61, and when a pull-out force is applied that pulls the anchor members 51 in the direction opposite to the insertion, the anchor holes 61, which decrease in cross section in the direction opposite to the insertion, can withstand the pull-out force, thereby improving the attachment strength of the balustrade 1.

[0080] As described above, in this embodiment, the anchor hole 61 is groove-shaped and is longer in the length direction than in the width direction, and the spacing between the reduced portions 66, 66 that form the inner surfaces on both sides of the anchor hole 61 in the width direction narrows in the anti-insertion direction, and multiple anchor members 51 are inserted into the anchor hole 61.Therefore, by inserting multiple anchor members 51, 51 into the groove-shaped anchor hole 61 that is long in the length direction, the mounting strength can be improved.

[0081] In this embodiment, the anchor member 51 connects the insertion direction ends of a pair of vertical reinforcement sections 52, 52, which are inserted direction reinforcing bars arranged at intervals along the length of the anchor hole 61, with the upper horizontal reinforcement section 53, which is a connecting reinforcement, and the anti-insertion direction ends of the pair of vertical reinforcement sections 52, 52 are fixed to the deck slab 5.By connecting the ends of the pair of inserted direction vertical reinforcement sections 52, 52 with the upper horizontal reinforcement section 53, the anchor member 51 and the solidification material 109 are integrated, and the attachment strength can be improved.

[0082] As described above, in this embodiment, the die 71 is for molding the anchor holes 61 of the wall balustrade 1, which is a precast concrete member, and which has anchor holes 61 into which the solidifying material 109 is filled while the anchor members 51 provided in the deck slab 5, which is the member to be attached, are loosely inserted, and the cross section of this anchor hole 61 narrows in the direction opposite to the insertion of the anchor members 51. The die 71 has one outer member 73, a central member 72, and the other outer member 73, which are divided into three parts in a direction intersecting the direction opposite to the insertion direction, and the width of the central member 72 narrows in the direction opposite to the insertion direction. Therefore, the central member 72 of the die 71 can be removed in the direction opposite to the insertion of the anchor members 51, and one of the outer members 73 can be moved toward the space of the anchor holes 61 from which the central member 72 was removed and peeled off from the concrete surface. The outer member 73 can then be pulled out in the direction opposite to the insertion, and the other outer member 73 can be pulled out in the same manner, thereby removing the die 71.

[0083] As an effect of the embodiment, multiple pipe bodies 6, 6 are arranged vertically at the top of the wall parapet 1, which is a concrete member, and the pipe ends 12T of the steel pipes 12 on both sides of the pipe body 6 are connected by connecting pipes 14 within the recess 22, and multiple other pipe bodies 7, 7... are buried below the recess 22, so that the steel pipes 12 in the recess 22 that can withstand shear forces and the pipe body 7 below the recess 22 can be used for wiring such as communication lines.

[0084] Furthermore, since the recess 22 has a bottomed structure with a recess lower surface 26, the pipes 7, 7 below the recess 22 can be connected to each other by sandwiching a joint packing 42 between the end surfaces 21, 21.

[0085] Furthermore, the packing material 31, which is an elastic water-stopping member, is provided with a mounting cylindrical body 33 having a mounting groove 32 at its tip end for fitting the pipe end 12T from the base end side, and the tip of the mounting groove 32 is closed by a closing portion 36. An enlarged portion 37 that tapers toward the base end is provided at the base end of the outer cylindrical portion 34 on the outer periphery of the mounting cylindrical body 33. Therefore, when the connecting pipe 14 is fitted over the pipe end 12T fitted with the packing material 31 from the tip side and moved toward the base end, the connecting pipe 14 elastically deforms the enlarged portion 37 so that it shrinks. In this state, a gap 38 is created between the outer surface of the connecting pipe 14 and the inner surface 37N of the enlarged portion 37, and the enlarged portion 37 deforms by the amount of the gap 38, making it possible to adjust the angle between adjacent steel pipes 12, 12.

[0086] Furthermore, the anchor hole 61 has an enlarged portion 65 (Fig. 3) at its upper part that narrows toward the top, so when the fillable solidification material 109 is filled through the lower injection hole 69, the air inside can be smoothly discharged through the upper discharge hole 70. Furthermore, since the central member 72 of the punching die 71 is provided with a plurality of connection protrusions 111 that connect the vertical pipes 112 of the discharge hole 70, the plurality of discharge holes 70 can be used to evacuate the air above the anchor hole 61 without leaving any air behind.

[0087] Furthermore, the punching die 71 has a central upper surface portion 83 that forms the upper surface portion 63 of the anchor hole 61 and upper surface molding portions 95, 95 (Figure 17), and the central upper surface portion 83 is provided with a connecting protrusion 111 that connects to the vertical pipe 112 of the discharge hole 70, so that by demolding the central member 72, a discharge hole 70 that communicates with the anchor hole 61 can be formed.

[0088] Furthermore, chamfered inclined surfaces 84K, 84K are formed on both sides of the lower thickness direction of the central lower surface portion 84, and inclined surfaces 95K, 95K that abut these inclined surfaces 84K, 84K are formed on the inner edge portion of the upper surface molding portion 95, 95, so that the central member 72 can be smoothly removed upward while leaving the outer members 73, 73 on both sides in the molding form 8.

[0089] After removing the central member 72, one of the outer members 73 can be tilted toward the center of the width of the anchor hole 61, thereby separating the outer panel 91 from the concrete surface and removing the outer member 73 upward.

[0090] Furthermore, the punching die 71 includes an anchor hole molding portion 74 that molds the anchor holes 61 and an outer mold portion 75 that is placed outside the molding form 8, so that the punching die 71 can be positioned within the molding form 8 using the outer mold portion 75 during molding.

[0091] Furthermore, a fixing means 131 is provided for bundling and fixing the central member 72 and the outer members 73, 73, which divide the anchor hole 61 into three parts in the width direction. Therefore, the central member 72 and the outer members 73, 73 are assembled and fixed by the fixing means 131, and a jig 132, which is a fixing member of the fixing means 131, is fixed to the outer part 75 of the formwork, and the punch die 71 can be positioned within the molding formwork 8 using the jig 132.

[0092] In addition, the fixing means 131 has a female screw portion 133N vertically installed in the widthwise center of the horizontal rod portion 133, and a vertical bolt 135 is screwed into this female screw portion 133N, with the lower end of this bolt 135 abutting against the upper surface of the central member 72, thereby preventing the central member 72 from shifting upward when concrete is poured into the molding formwork 8.

[0093] In addition, a protrusion 105 with a triangular cross section is provided on the outer surface of the outer member 73 between the extension portion 92 and the reduced molding portion 93, and this protrusion 105 is provided with a sloped portion 105S that molds the chamfered portion 68 of the anchor hole 61.Therefore, by removing the mold, the chamfered portion 68 can be formed on the opening edge of the anchor hole 61.Furthermore, the height of the jig 132 can be positioned by placing the lower end of the vertical rod portion 134 of the jig 132 on the upper surface portion 105J of the protrusion 105.

[0094] Furthermore, the injection hole 69 is provided with a receiving pipe 108 that opens onto the outer surface of the wall parapet 1, so that an external filling pipe such as a hose can be connected to the receiving pipe 108 and a solidifying material 109 such as mortar can be filled through this filling pipe.

[0095] In addition, a connecting tube portion 106 is provided on the inner surface of the reduced molding portion 93 of the outer surface plate 91 of one of the outer members 73. By inserting and connecting the base end 107K of the injection tube 107 of the injection hole 69 into this connecting tube portion 106, after the central member 72 and the other outer member 73 are demolded, the upper part of one of the outer members 73 can be tilted toward the center, causing the connecting tube portion 106 to come off the base end of the injection tube 107, and allowing the one outer member 73 to be demolded.

[0096] In addition, a receiving pipe 115 that opens onto the outer surface of the wall parapet 1 is provided in the discharge hole 70, so that an exhaust such as a hose can be connected to the receiving pipe 115 to release the air and also to confirm that the hose is filled with solidification material 109 that does not contain air, and after this confirmation, the filling of the solidification material 109 can be stopped.

[0097] In addition, after the concrete has cured, the fixing means 131 is released from the central member 72 and the three outer members 73, 73, and a lifting device (not shown) is connected to the lifting nut 101, which serves as the connector for the lifting device, and the central member 72 is removed upward.After that, the extension 92 is used to tilt the other outer member 73 toward the center of the width of the anchor hole 61, thereby separating its outer panel 91 from the concrete surface and removing the other outer member 73 upward.The extension 92 is used to tilt one of the outer members 73, which has the connecting tube portion 106, toward the center of the width, thereby separating its outer panel 91 from the concrete surface and releasing the connection between the connecting tube portion 106 and the injection pipe 107 of the injection hole 69.As a result of this manufacturing method, the removal mold 71, which has a shape in which the anchor hole 61 is divided into three parts, can be smoothly removed from the mold.

[0098] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the invention. For example, while the embodiments have been described using a wall balustrade as an example of a concrete member, the joint structure and mounting structure of the present embodiment can be used for precast concrete members other than wall balustrades, such as bridge girders, retaining walls, underground structures, and various other civil engineering structures. In addition to claim 3, as in Prior Art Document 1, a connecting pipe with a smaller diameter than the pipe end 12T may be inserted into the pipe end 12T of the pipe body to connect the pipe. In this case, a packing material may be attached to the pipe end of the connecting pipe, and its enlarged portion may abut the inner circumferential surface of the pipe end 12T. Furthermore, while cement-based solidifying materials 46 and 109 have been described as examples, epoxy-based materials may also be used as long as they solidify over time and achieve the required strength.

[0099] In addition, in the embodiment, a concrete deck slab is used as the member to be attached, but the member to be attached is not limited to concrete, and may be a steel bridge girder or the like. Furthermore, horizontal anchor members may be provided on the member to be attached, and horizontal anchor holes for loosely inserting these anchor members may be provided in the concrete member. For example, in the case of an L-shaped retaining wall having a bottom surface portion and a wall surface portion, the wall surface portion may be divided into upper and lower halves, and the two divided upper and lower wall surface portions may be integrated using the mounting structure of this embodiment. [Explanation of symbols]

[0100] 1 Wall parapet (concrete member) 6. Body 7. Body 11. Body 12 Steel pipe 12T pipe end 14 Connecting pipe 21 End face part 22 recess 23 End opening 24 Top opening 25 Recessed end surface 26 Recessed bottom surface 31 Packing material (elastic water-stopping material) 37 Enlarged section 46 Filling solidifying material 47 Key member

Claims

1. A joint structure for concrete members comprising a pair of precast concrete members, pipe bodies embedded in each of the pair of concrete members, and a connecting pipe connecting the pipe ends of the pipe bodies of the pair of concrete members, a bottomed recess having an end opening and a top opening is provided at an end of the concrete member in the longitudinal direction; The pipe end projects from the recess, A joint structure for concrete members, characterized in that the end face openings of the paired concrete members are aligned, and the pipe ends and connecting pipes are embedded in solidified material filled in adjacent, consecutive recesses.

2. 2. A joint structure for concrete members according to claim 1, wherein the connecting pipe and the pipe end side of the pipe body are made of steel.

3. 3. A joint structure for concrete members according to claim 2, wherein the pipe end is inserted into the connecting pipe for connection.

4. A joint structure for concrete members as described in claim 3, characterized in that an annular elastic water-stopping member is provided at the end of the pipe, and this elastic water-stopping member has an enlarged portion that abuts the inner surface of the connecting pipe and expands toward the tip, and the tip of this enlarged portion has a diameter larger than the inner diameter of the connecting pipe.

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