JP6374668B2 - Precast member connection method - Google Patents

Description

  The present invention relates to a method of connecting a structural member such as a box culvert of a precast member divided into a plurality of members and a structural member such as a beam member or a column member.

  Conventionally, when constructing a structure such as a box culvert by connecting precast members divided into a plurality of parts, or when connecting structural members such as columns and beams of precast members, these precast members or precast members Therefore, it was necessary to select a connection means that would not cause a problem in strength. For example, a part of the end of the precast member is notched to expose the reinforcing bar, the reinforcing bar is extended so as to straddle the other member, and the part is further reinforced by a bolt joint such as a plate and a bolt. Means are known, but the connecting part was complicated. Further, in the case of such connecting means, there is a problem that stress is easily concentrated on the portion, and the precast member is cracked or the concrete is peeled off from the portion.

  Further, as in Patent Document 1, an uneven fitting portion and a plurality of bolt insertion holes are provided on each joint surface in the longitudinal direction of the precast member, and a bolt box provided for each bolt insertion hole is used. Thus, there is known a connecting means for connecting the two by inserting and tightening a C-shaped bolt joint into the bolt insertion hole.

  In this case, a concave / convex fitting portion is provided on the joint surface of the precast member, and a relatively large bolt box for bolt insertion is provided at the end of the precast member, so that a predetermined connection strength can be obtained. The bolt box must be formed in advance, and, as described above, there is a possibility that a defect may occur in the portion due to the bolt connection.

  Furthermore, as in Patent Document 2, a technique is known in which a wall structure is constructed by connecting precast members to each other in a circumferential direction of a plurality of ring segments by means of male and female fittings such as joints. It was not suitable for the connection of precast members that would be large concrete segments, and it was not possible to obtain an integrated structure at the connection part.

  In the above prior art and Patent Documents 1 and 2, it was impossible to obtain a high strength and stable connection without causing stress concentration at the connecting portion, and it was not possible to shorten the construction period.

Japanese Patent No. 2727419 Japanese Patent No. 4707308 Japanese Patent Laid-Open No. 2004-19100

  The present invention solves the above-mentioned drawbacks, and can construct a large-scale structure that requires strength by connection that can be integrated without concentrating stress on the connection part of the divided precast member, And, in the connection work of the precast member, not only the construction means that hangs the precast member to be connected from above and arranges it at a predetermined position, it is possible to connect the precast member by moving it obliquely from the upper side or the side, The present invention provides a method for connecting precast members, which can be connected even at a site where construction cannot be performed from above, and can be connected to each other by simple means.

A method of connecting a precast member connected by a reinforcing bar joint embedded in the end of one precast member and a reinforcing bar joint embedded in the end of the other member. Insert the member without protruding from the end face of the precast member, block the opening of the rebar joint with a protrusion prevention jig to prevent the short rigid member from protruding from inside the rebar joint, and align the rebar of both precast members in a straight line After removing the protrusion prevention jig, the short rigid member is moved to the other joint side and stopped at a position straddling both precast members to be connected, and the injection grout material is injected into the joint and solidified. It is the connection method of the precast member characterized by these.

In addition, the precast member on which the rebar joint on which the short rigid member is set is located above the other precast member, and the short rigid member is prevented from dropping from the rebar joint by the protrusion prevention jig. The projection preventing jig installed in the joined state is removed and the short rigid member is freely dropped into the reinforcing bar joint of the other precast member located on the lower side. .

In addition, the short rigid member is installed in the reinforcing bar joint in a state where it receives a force in the direction of protruding from the reinforcing bar joint by the elastic force of the elastic member in the reinforcing bar joint of one of the precast members. 2. The precast member connection method according to claim 1, wherein the short rigid member is detached and protruded into the reinforcing bar joint of the other precast member.

The present invention has a simple structure by a large-sized precast member and a short rigid member that moves in a rebar joint in which precast members that require strength are embedded and fixed at their ends, and subsequent filling of the grout material. It has become possible to obtain a strong connection structure in which stress does not concentrate at the connection location.
In addition, the short rigid member of the connecting means forms a connecting structure by moving about half of it to the other member side adjacent to the precast member after installing one precast member or constructing a normal concrete structure. Therefore, it is not necessary to project the reinforcing bar from the end part in advance for any member, and it is not necessary to form irregularities at the end part. In addition, the precast member to be installed later can be installed at a predetermined position from any of the upper side, the diagonally upper side, or the side, and the workable range can be greatly increased.

  Furthermore, since it is not necessary to provide a notch in the connecting part or its adjacent position for connecting the members to each other, there is no need to use an uncured member such as mortar or concrete for reinforcing or repairing the part. Therefore, there is no waiting time until the mold is set and cured, and the construction period can be greatly shortened.

The perspective view which shows the state which connected the precast member. The schematic sectional side view of a connection part. The schematic sectional side view of a connection part. Detailed sectional drawing which shows the connection process of the connection part of a precast member. Detailed sectional drawing which shows the connection process of the connection part of a precast member. Detailed sectional drawing which shows the connection process of the connection part of a precast member. Detailed sectional drawing which shows the connection process of the connection part of a precast member. (A) Side sectional drawing of the other Example of a connection part. (B) Side sectional drawing of the other Example of a connection part. The detail sectional drawing of the other Example which shows the connection process of the connection part of a precast member. The detail sectional drawing of the other Example which shows the connection process of the connection part of a precast member. The detail sectional drawing of the other Example which shows the connection process of the connection part of a precast member. The detail sectional drawing of the other Example which shows the connection process of the connection part of a precast member. (A) The perspective view of the other Example which shows the state which connected the precast member, (b) The side sectional view of the other Example of a connection part. The schematic perspective view which shows the other Example of the connection part of a precast member.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 (a) shows a large structure that is a civil engineering structure, which is a box culvert formed by connecting the precast members 1 and 2 divided in the upper and lower directions, and the lower precast member 1 installed earlier, A precast member 2 that is installed and fixed thereon is connected at a connecting portion.

  A lower precast member 1 that is a divided precast member is installed on a base 3 such as a foundation or installation plate constructed in advance by a crane or the like, and the upper precast member 2 is similarly installed on the lower precast member 2, thereby strengthening the mutual connection portion. A box culvert can be completed by connecting.

  The lower precast member 1 is a member manufactured in advance in a factory or the like, and is a U-shaped member having a rectangular bottom plate 4 and left and right lower side walls 5 and 6 rising from both ends of the bottom plate 4. It is. It is transported to a predetermined construction place, hung with a crane or the like, and the bottom plate 4 is installed and fixed on a base 3 completed in advance, so that a semi-structure with an open upper part is made, and then the upper precast member 2 is Installation will be fixed.

  FIG. 1B is a cross-sectional view showing the upper ends of the lower left side wall 5 and the lower right side wall 6 of the lower precast member 1, and inside the left and right lower side walls 5, 6 of the lower precast member 1 in the width direction. The main reinforcing bars 7 and 8 are doubled, and the main reinforcing bar ends 9 and 10 are inserted into the space S1 of the first and second reinforcing bar joints 11 and 12, respectively.

  The first and second rebar joints 11, 12 are at the upper ends of the left and right lower side walls 5, 6 of the lower precast member 1, and the one side joint ends 13, 14 are the ends of the left and right lower side walls 5, 6. The first and second rebar joints 11 and 12 are embedded and fixed in advance so that they are substantially flush with the surface, and the other joint end portions 15 and 16 of the first and second rebar joints 11 and 12 are embedded and fixed in the left and right lower side walls 5 and 6. The distal end portions of the main reinforcing bars 7 and 8 are inserted into the space S1 from the other joint end portions 15 and 16.

  After the lower precast member 1 is installed, the upper precast member 2 is installed and fixed on the upper part. In the case of a conventional precast member, the main rebar protruding from the end of the upper precast member is inserted into the space of the first and second rebar joints 11 and 12 or protrudes from the end of the lower precast member. The upper precast member is installed while being inserted into the space of the third and fourth rebar joints of the upper precast member to be described later. For this purpose, the upper precast member is maintained in a substantially vertical state. In this case, it is lowered from the top to the bottom.

  However, depending on the installation location, the upper precast member cannot be lowered from the upper side, and there is a case where it must be moved from the horizontal direction or the diagonally upward direction. In this case, the reinforcing bars projecting upward and downward from the end portions of the upper and lower precast members become an obstacle, and a situation in which the upper precast member cannot be installed occurs.

  In the present invention, since the main rebar does not protrude from either the lower precast member 1 or the upper precast member 2 or has a shape in which no uneven portion is formed at the end, the upper precast member 2 is horizontally or diagonally upward. It can be installed and fixed from any direction.

  As shown in FIG. 1A, the upper precast member 2 includes a rectangular upper plate 17 manufactured in advance in a factory or the like, and left and right upper side walls 18 and 19 hanging downward from both ends of the upper plate 17. It is a member formed by the above, and is a member having an inverted U-shaped cross section. The thicknesses of the left and right upper side walls 18 and 19 and the dimension therebetween are the same as the thicknesses of the left and right lower side walls 5 and 6 of the lower precast member 1 and the dimension therebetween.

FIG. 1C is a cross-sectional view showing the lower ends of the upper left side wall 18 and the upper right side wall 19 of the upper precast member 2. Like the lower precast member 1, the left and right upper side walls 18, 19 are arranged in the width direction. The main reinforcing bars 20 and 21 are doubled, and the end portions 22 and 23 thereof are inserted into the space S2 of the third and fourth reinforcing bar joints 24 and 25, respectively.

  The third and fourth rebar joints 24 and 25 are provided at the lower ends of the left and right upper side walls 18 and 19 of the upper precast member 2, and the one side joint ends 26 and 27 are the end portions of the left and right upper side walls 18 and 19. It is embedded and fixed in an exposed state so as to be flush with the surface, and the other joint end portions 28 and 29 of the third and fourth rebar joints 24 and 25 are embedded and fixed in the left and right upper side walls 18 and 19. The leading end portions of the main reinforcing bars 20 and 21 are inserted into the space S2 from the other joint end portions 28 and 29.

  In the space S2 of the third and fourth rebar joints 24, 25, as shown in FIG. 1 (c), short rigid members 30, 31 that are movable in the space S2, Insertion is performed in a temporarily placed state in which the exposed side end portions are pressed by the protrusion prevention jigs 32 and 33 so as not to fall off from the fourth rebar joints 24 and 25. The upper precast member 2 is inserted into the third and fourth rebar joints 24 and 25 in a temporarily fixed state so as not to protrude or drop off from the third and fourth rebar joints 24 and 25 until the manufacture, movement and installation of the upper precast member 2. doing.

  The short rigid members 30 and 31 are similar to or thicker than the main reinforcing bars 20 and 21 and have a strength having a length and a thickness that fit within the space S2 of the third and fourth reinforcing bar joints 24 and 25. It forms with a reinforcing bar, The both ends form the expansion parts 30a and 31a as needed. It becomes possible to increase the fixing force with the grout material filled in the space S2 after the installation by the inflating portions 30a and 31a.

2 (a), 2 (b), 2 (c), and 2 (d) are detailed views of the connecting portions of the first to fourth rebar joints 11, 12, 24, and 25, and the connecting steps of the connecting portions are sequentially performed. Show.
As shown in FIG. 2A, the protrusion preventing jigs 32 and 33 are L-shaped formed of flanges 32a and 33a and webs 32b and 33b, and the flanges 32a and 33a are formed on the upper left and right side walls of the upper precast member 2. By fixing it to the corners of the 18 and 19 with bolts or the like, it is fixed to the corresponding portion, and the other web 32b, 33b side is used as a means for preventing the short rigid members 30, 31 from protruding.

  The protrusion prevention jigs 32 and 33 firmly attached by screwing or fitting bolts or the like into the recesses or the like provided at the corners 18 and 19 of the upper precast member 2 are the exposed side ends of the precast member 2. When the webs 32b and 33b are brought into contact with each other, the short rigid members 30 and 31 are prevented from falling off from the third and fourth rebar joints 24 and 25.

  The both end portions of the left and right upper side walls 18 and 19 of the upper precast member 2 are cut out by the thickness dimension of the webs 32b and 33b as necessary so that the projection preventing jigs 32 and 33 do not get in the way when installed, It can be set as the attachment part of the protrusion prevention jigs 32 and 33. FIG.

  In addition, after the upper precast member 2 is installed at a predetermined position, the protrusion prevention jigs 32 and 33 are removed in advance to remove the protrusion prevention jigs 32 and 33 in advance, and the gripping means 32c and 33c are removed outward. It can be formed in a protruding state.

  The protrusion prevention jigs 32 and 33 can be removed by releasing the screwing or fitting of the bolts of the fall prevention jigs 32 and 33 and pulling the removal gripping means 32c and 33c outward. About half of the short rigid members 30 and 31 are moved into a predetermined position by natural fall into the first and second rebar joints 11 and 12 of the lower precast member 1.

A packing 34 is disposed on either end of the upper and lower precast members 1 and 2 as necessary, so that the distance between the upper and lower precast members 1 and 2 is equal to a predetermined value. Can be held.

Hereinafter, the connection between the upper and lower precast members 1 and 2 will be described in detail with reference to FIGS.
The upper precast member 2 is moved by an appropriate hanging movement means such as a crane with the end side where the third and fourth rebar joints 24 and 25 are embedded and fixed on the lower precast member 1 installed in the previous step. Move from above, diagonally above or from the side.

  As shown in FIG. 2A, the joint end portions 13 of the first and second rebar joints 11 and 12 of the lower precast member 1 and the third and fourth rebar joints 24 and 25 of the upper precast member 2 installed previously. , 14, 26, and 27, the movement of the upper precast member 2 is stopped at a position where they face each other, and the upper precast member 2 is placed on the previously installed lower precast member 1 and temporarily fixed.

  Thereafter, as shown in FIG. 2 (b), the bolts or the like that have fixed the projection preventing jigs 32 and 33 are released from the side wall surface, and the removal gripping means 32c and 33c are pulled outward to pull out the projection preventing jigs 32. 33 can be removed from the upper precast member 2. As a result, the short rigid members 30 and 31 temporarily placed in the third and fourth rebar joints 24 and 25 are connected to the third and fourth rebar joints 24 and 25, as shown in FIG. The joint ends 26 and 27 that are opened respectively fall from the space S2 due to their own weight. The short rigid members 30 and 31 that have fallen are placed in the space S1 of the first and second rebar joints 11 and 12 facing portions that are approximately half the length of the main body, the length of which has been determined in advance by the moving length. Will move.

  The short rigid members 30 and 31 moved into the space S1 can move about half of the main body formed inside the first and second rebar joints 11 and 12 or the third and fourth rebar joints 24 and 25. The movement is stopped at a predetermined position by a locking means such as a convex portion preset at the position or a locking portion as appropriate.

  The center of the short rigid members 30, 31 has a predetermined width in the longitudinal direction, and the periphery thereof is coated by a color different from the color of the short rigid members 30, 31 or by tape means. By forming the markings 35 and 36, whether or not the short rigid members 30 and 31 have moved to an appropriate position can be confirmed by visual observation from the gap 37 between the upper and lower precast members 1 and 2 temporarily fixed. It becomes possible.

  Thereafter, as shown in FIG. 2 (d), the gap 37 is sealed, and the main reinforcing bars 7, 8 in the first and second reinforcing bar joints 11, 12 and in the third and fourth reinforcing bar joints 24, 25. The grout material 38 is injected from the outside into the spaces S1 and S2 remaining around the periphery of the short rigid members 30 and 31.

  The grout material 38 is injected and discharged into the grout material inlets 39 and 40 formed on the joint end portions 15 and 16 side of the first and second rebar joints 11 and 12 where the main reinforcing bars 7 and 8 are inserted. Grout material discharge ports 43 formed on the side of the joint ends 28 and 29 on the side where the main reinforcing bars 20 and 21 of the third and fourth rebar joints 24 and 25 are inserted, respectively. , 44 are attached to the discharge hoses 45 and 46, respectively, so that grout material is injected and discharged.

  By injecting the grout material 38 from the injection hoses 41, 42, the entire spaces S 1, S 2 are filled from the lower side to the upper side, and from the grout material discharge ports 43, 44 through the discharge hoses 45, 46. It can be confirmed that the grout material 38 is filled in the entire spaces S1 and S2 by discharging the grout material 38 to the outside.

  The injection and discharge of the grout material 38 may be performed individually for the first and third rebar joints 11 and 24 and the second and fourth rebar joints 12 and 25 or other rebar joints at adjacent positions. It is also possible to perform injection and discharge all at once by connecting a plurality of the injection hoses 41 and 42 and the discharge hoses 45 and 46 in advance.

Although the first embodiment has been described along the precast member that is the rectangular box culvert shown in FIG. 1A, the present invention is not limited to the box culvert.
It may be a curved precast member. In the case of the curved precast member, the connecting portion also has a curved shape, which can be handled by the connecting structure of this embodiment. At this time, it is assumed that the short rigid member can cope with the curved shape.

  In the first embodiment, the embodiment in which the upper and lower precast members 1 and 2 are divided into two parts has been described. However, the present invention is not limited to this. And it makes it possible to build larger structures.

  In the above-described embodiment, an example in which the main reinforcing bars 7, 8, 20, and 21 are doubled in each of the upper and lower precast members 1 and 2 has been shown. It can be. Moreover, the space | interval in the longitudinal direction which provides the reinforcing bar joint of each member can also be suitably selected according to necessity.

  3 (a) and 3 (b) show the connection of the upper and lower precast members 50 and 51 for constructing a large-scale structure such as a box culvert to be a civil engineering structure as in the first embodiment. The box culvert shows a structure, and the precast member is divided into upper and lower parts, and is composed of a lower precast member 50 installed first and an upper precast member 51 installed thereon.

  The lower precast member 50 is installed on a base 52 such as a foundation or an installation plate. 3A is a cross-sectional view showing the upper ends of the lower left side wall 53 and the lower right side wall 54 rising from both ends of the bottom plate of the lower precast member 50 constituting the same box culvert as in FIG. Inside the left and right lower side walls 53 and 54 of the member 50, main reinforcing bars 55 and 56 are doubled in the width direction, and the main reinforcing bar ends 57 and 58 are connected to the fifth and sixth reinforcing bar joints 59 and 60, respectively. An insertion bar is arranged in the space S3.

  The fifth and sixth reinforcing bar joints 59 and 60 are provided at the upper end portions of the left and right lower side walls 53 and 54 of the lower precast member 50, and the one side joint end portions 61 and 62 are end surfaces of the left and right lower side walls 53 and 54. Embedded and fixed in advance so as to be flush with each other, and the other joint end portions 63 and 64 side of the fifth and sixth rebar joints 59 and 60 are embedded and fixed in the left and right lower side walls 53 and 54, The distal end portions of the main reinforcing bars 55 and 56 are inserted into the space S3 from the other side joint end portions 63 and 64.

  Further, short rigid members 65 and 66 that are movable in the space S3 are inserted into the space S3 of the fifth and sixth rebar joints 59 and 60 of the lower precast member 50 in a temporarily placed state. ing. Until the lower precast member 50 is manufactured, moved and installed, the short rigid members 65 and 66 are temporarily fixed so that the short rigid members 65 and 66 do not protrude or fall from the fifth and sixth rebar joints 59 and 60. The six rebar joints 59 and 60 are inserted and arranged.

  Between the main rebars 55, 56 of the fifth and sixth rebar joints 59, 60 and the short rigid members 65, 66, elastic bodies 67, 68 such as a spiral spring body or an elastic body having a high repulsive force. The elastic bodies 67 and 68 have a resilient force that pushes upward about half the length of the short rigid members 65 and 66 when they are extended. Adopt things.

  When the short rigid members 65, 66 are moved into the space S4 of the seventh and eighth rebar joints 69, 70 embedded and fixed at the end of the upper precast member 51, the tip ends thereof are moved by about half of the main body. It is possible to stop at a predetermined position by forming appropriate locking means such as a protruding portion and a locking portion that can be locked in advance.

  In a state where the elastic bodies 67 and 68 are compressed against the elastic force, the protruding and preventing jigs 71 and 72 of the short rigid members 65 and 66 are disposed on the exposed side of the short rigid members 65 and 66. Attach. The shapes of the protrusion movement preventing jigs 71 and 72 are the same as the protrusion preventing jigs 32 and 33 of the first embodiment. The attachment method and the desorption method are also the same. In order to prevent protrusion, a recess is provided on the side wall surface side, and the bolt tip side is screwed or fitted into the recess so as to be firmly fixed.

  The short rigid members 65 and 66 are provided with center markings 73 and 74 at the center thereof, or the structure such as packing is the same as that of the first embodiment.

Hereinafter, the mutual connection between the upper and lower precast members 50 and 51 will be described in detail with reference to FIGS.
The upper precast member 51 is placed on the lower precast member 50 installed in the previous step, with the seventh and eighth rebar joints 69 and 70 side down, by means of appropriate hanging movement means such as a crane, above, obliquely above or on the side. Move from the direction.

  As shown in FIG. 4 (a), the ends of the fifth and sixth rebar joints 59 and 60 of the lower precast member 50 and the seventh and eighth rebar joints 69 and 70 of the upper precast member 51 installed in advance are connected to each other. The movement of the upper precast member 51 is stopped at the position where it faces and coincides, and is placed on the lower precast member 50 previously installed and temporarily fixed. Further, a packing for holding the gap at a predetermined value and evenly can be disposed at the end of the lower precast member 50 or the upper precast member 51 as necessary.

  Thereafter, as shown in FIG. 4 (b), the bolts and the like that have fixed the protruding movement preventing jigs 71 and 72 are released from the side wall surface, and the removing gripping means 71a and 72a are pulled outward to prevent the protruding movement. The jigs 71 and 72 can be removed from the lower precast member 50. Accordingly, the short rigid members 65 and 66 temporarily placed in the fifth and sixth rebar joints 59 and 60 are connected to the fifth and sixth rebar joints 59 and 60, as shown in FIG. The elastic bodies 67 and 68 in the space S3 project upward from the joint ends 61 and 62 that are opened. The projecting short rigid members 65 and 66 are appropriately stopped by the locking means and moved into the space S4 of the seventh and eighth rebar joints 69 and 70, which are approximately half the length of the preset main body. become.

  The short rigid members 65 and 66 that have moved are pushed upward by the elastic bodies 67 and 68 on one end side, and the seventh and eighth rebar joints 69 and 70 or the fifth and fifth ends on the other end side. 6 Locking by appropriate locking means such as convex portions and locking portions formed inside the reinforcing bar joints 59 and 60, and stably stopping at a predetermined position while being strongly pressed by the elastic bodies 67 and 68 become.

  The center of the short rigid members 65 and 66 is centered by coating or tape means having a predetermined width in the longitudinal direction and a color different from the color of the short rigid members 65 and 66 around the center. By forming the markings 73 and 74, whether or not the short rigid members 65 and 66 have moved to their normal positions can be confirmed by visual observation through the gap 75 between the upper and lower precast members 50 and 51 temporarily fixed. It becomes possible.

  Thereafter, as shown in FIG. 4D, the gap 75 is sealed, and the main reinforcing bars 55 and 56 in the fifth and sixth reinforcing bar joints 59 and 60 and the seventh and eighth reinforcing bar joints 69 and 70 are sealed. The grout material 76 is injected from the outside into the spaces S3 and S4 remaining around the short and rigid short members 65 and 66.

  The grout material 76 is injected and discharged in the same manner as in the first embodiment. The grout material injection port 77 formed on the end side of the fifth and sixth reinforcing bar joints 59 and 60 on the side where the main reinforcing bars 55 and 56 are inserted, An injection hose 79, 80 is attached to 78, and on the other hand, it is discharged to the grout material discharge ports 81, 82 formed on the end side of the seventh and eighth rebar joints 69, 70 where the main rebar is inserted. By attaching the hoses 83 and 84, respectively, the injection and discharge means are provided.

  By injecting the grout material 76 from the injection hoses 79 and 80, the entire spaces S3 and S4 are filled from the lower side to the upper side, and from the grout material discharge ports 81 and 82 through the discharge hoses 83 and 84. It can be confirmed that the grout material 76 is filled in the entire spaces S3 and S4 by discharging the grout material 76 to the outside.

  The injection and discharge of the grout material 76 may be performed individually with respect to the fifth and seventh rebar joints 59 and 69 and the sixth and eighth rebar joints 60 and 70 or other rebar joints at adjacent positions. It is also possible to perform injection and discharge all at once by connecting a plurality of the injection hoses 79 and 80 and the discharge hoses 83 and 84 in advance.

  The elastic bodies 67 and 68 inserted and arranged in the fifth and sixth rebar joints 59 and 60 remain in the stretched state, and they are buried and fixed in the space S3 by injection of the grout material 76. become. In particular, in the case of a spiral spring body or a leaf spring, the grout material 76 wraps around the spring body and becomes an effective connection structure as a strong fixing means in the space.

  Although the said Example 2 was demonstrated along the precast member used as the rectangular box culvert shown to Fig.1 (a) similarly to Example 1, this invention is not limited to a box culvert. It may be a curved precast member. In the case of a curved precast member, the connecting portion also has a curved shape, but can be handled by the connecting structure of this embodiment. At this time, it is assumed that the short rigid member can cope with the curved shape.

  Moreover, in the said Example 2, although the embodiment which divided the upper and lower precast members 50 and 51 into 2 was demonstrated, it is not limited to this, The same connection structure is employ | adopted also in 3 divisions, 4 divisions, 5 divisions ... And it makes it possible to build larger structures.

  As in the first embodiment, the number of main reinforcing bars, reinforcing bar joints, and the like, the intervals thereof, and the like can be appropriately selected according to the necessity of the thickness and strength of the precast member. The same applies to the longitudinal direction of the member.

FIG. 5 is an embodiment showing a connecting structure of structural members constituting a structure such as a building structure or a civil engineering structure. The structural member connects the precast members to each other or the precast member and a normal concrete structural member. The horizontal member is constructed with.
Hereinafter, a beam will be described as an example of a horizontal member.

  In order to obtain a strong beam by connecting precast members, etc., it is necessary to connect the main reinforcing bars in the connecting part so as to be integrated. Notches have been provided or rebars have been protruded from precast members, etc., and continuous beams have been constructed using these notches and protruding rebars. Therefore, it is necessary to bury the notches and the surroundings of the reinforcing bars with concrete after connecting the reinforcing bars.

  Further, when the reinforcing bar protrudes from the end of the beam member to be connected, if there is no large notch corresponding to the protruding reinforcing bar on the already built beam member side, a precast member is formed in a gap having a predetermined size. The structural members of the beam could not be inserted and arranged. In the case where the reinforcing bar protrudes from the previously constructed beam end, it is necessary to previously provide a notch corresponding to the protruding reinforcing bar at the precast beam end to be connected.

  In the third embodiment, as in the first and second embodiments, the third beam constituting member 92 made of a precast member is provided between one first beam constituting member 90 and the other second beam constituting member 91. It is an Example which can be inserted and connected without providing a notch part in the edge part.

  The main reinforcing bar end portion 94 of the main reinforcing bar 93 of the first beam constituting member 90 is inserted and arranged in the space S5 from the end side of the ninth reinforcing bar joint 95 embedded in the end portion of the first beam constituting member 90. ing. The configuration is the same on the second beam constituting member 91 side.

  On the other hand, the main reinforcing bar end portion 97 of the main reinforcing bar 96 arranged in the member of the third beam forming member 92 inserted between the left and right first and second beam forming members 90 and 91 is a tenth reinforcing bar joint 98. Is inserted and placed in the space S6 from the end side.

  In each of the spaces S5 and S6 of the ninth and tenth reinforcing bar joints 95 and 98, the short reinforcing bar 99 which is movable in the spaces S5 and S6 shown in the above embodiment is provided in the ninth, It is inserted in a temporarily placed state where its exposed side end is pressed by the protrusion preventing jig 100 so as not to fall off from the tenth reinforcing bar joints 95 and 98. For example, when the short reinforcing bar 99 is disposed on the third beam constituting member 92, the first reinforcing bar is temporarily fixed so that it does not protrude or drop off from the tenth reinforcing bar joint 98 until the precast member is manufactured, moved and installed. The 10 rebar joints 98 are inserted into the space S6.

  The short rebar 99 is the same as or thicker than the main rebars 93 and 96 as in the above embodiment, and the length and the thickness fit in the spaces S5 and S6 of the ninth and tenth rebar joints 95 and 98. It is formed with a steel rod or a reinforcing bar having strength, and both end portions form inflatable portions as necessary. It is possible to increase the fixing force with the grout material filled in the spaces S5 and S6 after the installation by the expansion portion.

  The fall prevention jig 100 has an L-shape formed of a flange and a web, and the flange is attached to the side wall of the third beam constituting member 92 with a bolt or the like, and the other web is attached to the exposed side of the third beam constituting member 92. It is made to contact | abut to an edge part, and it is the fall prevention means of this short rebar 99.

  The third beam constituting member 92 made of a precast member is moved from above, obliquely above or from the side or below by a suspension moving means such as a crane, and the first beam constituting member 90, which has been completed in the previous process, It is inserted between the two beam constituent members 91, moved to a position where the outer end openings of the ninth rebar joint 95 and the tenth rebar joint 98 are opposed to each other, and temporarily fixed.

  Then, the bolt etc. which fixed the protrusion prevention jig | tool 100 are removed from a side wall surface. Since the third beam constituting member 92 is a horizontal member, the short reinforcing bar 99 remains in the space S6 of the tenth reinforcing bar joint 98.

  In the space S5 of the ninth reinforcing bar joint 95, locking means such as a convex portion and an appropriate locking portion are provided in advance at a position where about half of the main body of the short reinforcing bar 99 can move.

  In addition, a center marking is formed at the center in the longitudinal direction of the short reinforcing bar 99 by coating or tape means having a predetermined width in the longitudinal direction and a color different from the color of the short reinforcing bar 99 around it. It is possible to confirm whether or not the short reinforcing bar 99 has moved to an appropriate position by observing from the gap between the first and second beam constituting members 90 and 91 and the third beam constituting member 92. It becomes.

  The short rebar 99 in the space S6 of the tenth reinforcing bar joint 98 is vibrated to the third beam constituting member 92 by a vibration exciter, whereby the ninth rebar joint of the first and second beam constituting members 90, 91 is obtained. It can be moved by a predetermined length into the space S5 of 95,95.

  Further, as will be described later, by injecting the grout material from the inner end side of the tenth rebar joint 98, the grout material is pushed, and the short rebar 99 enters the space S5 of the ninth rebar joint 95. Insertion arrangement is possible. At this time, the bulging portion of the short reinforcing bar 99 can enlarge the surface in contact with the grout material and can be an effective means for movement.

  In this case, the gap between the first and second beam constituting members 90 and 91 and the third beam constituting member 92 is sealed, and the main reinforcing bar ends 94 and 97 in the ninth and tenth reinforcing bar joints 95 and 98 are sealed. The grout material is injected from the outside into the remaining spaces S5 and S6 formed around the periphery and the short reinforcing bars 99.

As with the first and second embodiments, the grout material is injected and discharged by inserting an injection hose into the grout material inlet formed on the joint end side of the tenth rebar joint 98 where the main rebar 96 is inserted. On the other hand, the discharge hose can be attached to the grout material discharge port formed on the inner joint end side which is the side where the main rebar 93 of the ninth rebar joint 95 is inserted. .

  By injecting grout material from the injection hose, the entire spaces S5 and S6 are filled, and the grout material is discharged to the outside through the discharge hose from the grout material discharge port, so that the grout is entirely formed in the spaces S5 and S6. It can be confirmed that the material is filled.

  The short rigid member is moved to a predetermined position in the space of the reinforcing bar joint on the other side with the pressure of compressed air generated by blowing compressed air from the above-described injection hose or discharge hose. You can also.

  The injection and discharge of the grout material may be performed individually for the ninth and tenth reinforcing bar joints 95 and 98 or other reinforcing bar joints adjacent to each other, or a plurality of the injection hose and the discharging hose may be provided in advance. By connecting, it is also possible to perform injection and discharge all at once.

  In the above embodiment, the example in which the main reinforcing bars 93 and 96 are doubled in each of the first and second beam constituting members 90 and 91 and the third beam constituting member 92 is shown. However, the member thickness, strength, etc. The number can be appropriately determined according to the necessity.

FIG. 6 is an embodiment showing a connecting structure of structural members constituting a structure such as a building structure or a civil engineering structure as in the third embodiment. The structural member is a precast member or a precast member and a normal concrete structure. A vertical member is constructed by connecting the members. Hereinafter, a column will be described as an example of the vertical member.

  The main reinforcing bar end 103 of the main reinforcing bar 102 of the first column constituting member 101 is inserted into the space S7 from the end of the eleventh reinforcing bar joint 104 embedded in the end of the first column constituting member 101. ing.

  On the other hand, the second column constituting member 105 connected to the first column constituting member 101 has the main reinforcing bar end 107 of the main reinforcing bar 106 arranged in the member from the end side of the twelfth reinforcing bar joint 108. It is inserted into the space S8.

  In the space S8 of the twelfth rebar joint 108, a short rigid member 109 that is movable in the space S8 is exposed at its end on the exposed side by a protrusion preventing jig so as not to fall out of the twelfth rebar joint 108. It is inserted in a temporarily placed state to hold down. The second column constituting member 105 is inserted and arranged in the space S8 of the twelfth rebar joint 108 in a temporarily fixed state so as not to protrude or drop out from the twelfth rebar joint 108 until the manufacturing, movement and installation of the second pillar component member 105.

The short rigid member 109 is formed of a strong reinforcing bar having a length and a thickness that fits in the space S8 of the twelfth reinforcing bar joint 108 and is thicker than the main reinforcing bar 106, and both ends thereof are formed. An inflatable part is formed as necessary. It becomes possible to increase the fixing force with the grout material filled in the spaces S7 and S8 after the installation by the inflating part.

  The protrusion preventing jig has an L-shape formed of a flange and a web, and the flange is attached to the side wall of the second column constituting member 105 with a bolt or the like, and the other web is fixed to the lower end of the second column constituting member 105. This is used as a means for preventing the short rigid member 109 from falling.

  The second column constituting member 105 made of a precast member is moved from above, obliquely above or from the side by a suspension moving means such as a crane, and the eleventh reinforcing bar is moved onto the first column constituting member 101 completed in the previous step. The joint 104 and the twelfth rebar joint 108 are moved to positions facing each other so that the outer end opening portions thereof coincide with each other and temporarily fixed.

  Thereafter, when the bolt or the like that has fixed the fall prevention jig is removed from the side wall surface, the short rigid member 109 temporarily placed in the space S8 of the twelfth rebar joint 108 is moved to each of the twelfth rebar joints 108. It falls into the space S7 of the eleventh reinforcing bar joint 104 by its own weight from the open joint end. The fallen short rigid member 109 moves into the space S7 of the eleventh reinforcing bar joint 104, which is about half the length of the main body, and is connected to the first column constituting member 101 and the second column constituting member. Stop in a state of straddling the member 105.

  The short rigid member 109 that has moved into the space S7 is a convex portion that is set in advance to a position where about half of the main body formed inside the eleventh rebar joint 104 or the twelfth rebar joint 108 can move, or an appropriate locking portion. The movement is stopped at a predetermined position by the locking means.

A center marking is formed at the center in the longitudinal direction of the short rigid member 109 by coating or tape means having a predetermined width in the longitudinal direction and a color different from the color of the short rigid member 109 around it. Thus, it is possible to confirm whether or not the short rigid member 109 has moved to an appropriate position by visually observing the gap between the first and second columnar constituent members 101 and 105 temporarily fixed.

  Thereafter, the gap is sealed, and the remaining spaces S7 and S8 formed around the main reinforcing bars 103 and 107 and around the short rigid member 109 in the eleventh reinforcing bar joint 104 and the twelfth reinforcing bar joint 108 are formed. Inject grout material from outside.

For injection of the grout material, an injection hose is attached to the grout material injection port formed on the joint end side of the eleventh reinforcing bar joint 104 on the side where the main reinforcing bar 102 is inserted, while discharging is performed on the twelfth reinforcing bar. This can be done by attaching a discharge hose to the grout material discharge port formed on the joint end side of the joint 108 where the main reinforcing bar 106 is inserted.

  Filling the entire space S7 and S8 by injecting grout material from the injection hose, and confirming that the grout material has been filled by being discharged from the grout material discharge port through the discharge hose. can do.

  The grout material may be injected and discharged individually for the eleventh reinforcing bar joint 104 and the twelfth reinforcing bar joint 108 or other reinforcing bar joints adjacent to each other, or a plurality of the injection hose and the discharging hose may be provided. By connecting in advance, it is also possible to perform injection and discharge all at once.

  In the fourth embodiment, an example in which four main reinforcing bars 102 and 106 are arranged in each of the first and second column constituting members 101 and 105 is shown. However, according to the necessity of the column thickness, strength, and the like. The number can be appropriately determined. Moreover, the space | interval for the connection part in the longitudinal direction of each member can also be suitably selected as needed.

  An elastic body and a short rigid member are provided in one of the reinforcing bar joints shown in the second embodiment in the reinforcing bar joints of the beam constituent members and the column constituent members in the above-described third and fourth embodiments. It is also possible to employ a connection structure in which half of the short rigid member is moved into the other reinforcing bar joint by force. Other various configurations are the same as those in the third and fourth embodiments.

  Moreover, although the said Example 3, 4, 5 demonstrated along the precast member of a horizontal member and a vertical member as a beam structural member and a column structural member, this invention is not limited to a horizontal member and a vertical member. Absent. It may be a component of a curved beam or column. In the case of a curved beam or column precast member, the connecting portion also has a curved shape, but can be handled by the connecting structure of this embodiment. At this time, the short rigid member can also cope with the curved shape.

1, 50 Lower precast member 2, 51 Upper precast member 3, 52 Base 4 Bottom plate 5, 53 Left lower side wall 6, 54 Right lower side wall 7, 8, 20, 21, 55,
56, 93, 96, 102, 106 Main reinforcing bars 9, 10, 22, 23, 57
58, 94, 97, 103, 107 Main rebar end 11 First rebar joint 12 Second rebar joint 13, 14, 26, 27, 61, 62 One side joint end 15, 16, 28, 29, 63, 64 Other joint end 17 Upper plate 18 Upper left side wall 19 Upper right side wall 24 Third rebar joint 25 Fourth rebar joint 30, 31, 65, 66, 99, 109 Short rigid members 32, 33, 100 Protrusion prevention jig 34 Packing 35 36, 73, 74 Center marking 37, 75 Gap 43, 44, 81, 82 Grout material outlet 39, 40, 77, 78 Grout material inlet 41, 42, 79, 80 Injection hose 43, 44, 81, 82 Grout material outlet 45, 46, 83, 84 Discharge hose 59 Fifth rebar joint 60 Sixth rebar joint 67, 68 Elastomer 69 Seventh rebar joint 70 Eighth rebar joint 71, 72 Protrusion prevention jig 90 1st beam component 91 91 2nd beam component 92 3rd beam component 95 95 9th bar joint 98 10th bar joint 99 Short bar 101 First column member 104 11th bar joint 105 2nd column Constituent member 108 No. 12 rebar joint

Claims (5)

A method of connecting a precast member connected by a reinforcing bar joint embedded in the end of one precast member and a reinforcing bar joint embedded in the end of the other member. Insert the member without protruding from the end face of the precast member, block the opening of the rebar joint with a protrusion prevention jig to prevent the short rigid member from protruding from inside the rebar joint, and align the rebar of both precast members in a straight line After removing the protrusion prevention jig, the short rigid member is moved to the other joint side and stopped at a position straddling both precast members to be connected, and the injection grout material is injected into the joint and solidified. A method for connecting precast members characterized by the above. A state where the precast member with the rebar joint on which the short rigid member is set is positioned above the other precast member, and the short rigid member is prevented from dropping from the rebar joint by the protrusion prevention jig 2. The connection of the precast member according to claim 1, wherein the protrusion preventing jig installed in the joint state is removed and the short rigid member is freely dropped into the reinforcing bar joint of the other precast member located on the lower side. Method. The short rigid member is installed in the reinforcing bar joint in a state where it receives the force in the direction protruding from the reinforcing bar joint due to the elastic force of the elastic member in the reinforcing bar joint of one precast member. 2. The method of connecting precast members according to claim 1, wherein the short rigid member is projected into the reinforcing bar joint of the other precast member. The method for connecting precast members according to any one of claims 1 to 3, wherein the short rigid member is formed with a bulging portion having a thickened cross section at both ends thereof. The precast member connection method according to any one of claims 1 to 4, wherein the precast member is any one of a box culvert divided vertically and a column, or a beam divided horizontally.

Images