JP4481526B2 - Temporary fixing structure for precast concrete members - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an assembly to temporary fixing structure for easily and quickly perform precast concrete member.
[0002]
[Prior art]
For example, as a large box culvert composed of a precast concrete member, conventionally, a two-part type or a four-part type is used.
The two-part type box culvert is composed of a lower divided body and an upper divided body. The lower divided body is composed of a bottom wall and lower side walls rising from both ends of the bottom wall. The upper side wall is provided from both ends of the upper wall.
Then, the mating surface at the upper end of the lower side wall and the mating surface at the lower end of the upper side wall are aligned, and the lower divided body and the upper divided body are connected and fixed using a mortar filling joint to assemble the box culvert. .
The quadruple-type box culvert includes a lower divided body, two intermediate side walls, and an upper divided body. The lower divided body includes a bottom wall and a lower side wall that stands from both ends of the bottom wall. The intermediate side wall is configured in a rectangular parallelepiped shape, and the upper divided body is configured by an upper wall and upper side walls that are suspended from both ends of the upper wall.
And the mating surface of the upper end of a lower side wall and the mating surface of the lower end of an intermediate | middle side wall are match | combined, and a lower division body and an intermediate | middle side wall are connected and fixed using a mortar filling type joint. After that, align the upper end of both intermediate side walls with the lower end of the upper side wall, and connect and fix the intermediate side wall and the upper divided body using a mortar filling joint, thereby assembling the box culvert. Yes.
[0003]
[Problems to be solved by the invention]
However, in the case of the above-described two-divided type box culvert, when the lower divided body and the upper divided body are connected and fixed, and in the case of the four-divided type box culvert, the lower divided body and the intermediate side wall. When connecting and fixing the intermediate side wall and the upper divided body, it is necessary to temporarily fix them using a plurality of supporters in order to maintain their connection state, and the box culvert can be assembled easily and quickly. There was no problem.
In addition, mortar-filled joints are also used when precast concrete members that form pillars are erected on a concrete floor that has been placed, but in this case as well, it is necessary to temporarily fix them using multiple supports. There was a problem that it was not possible to assemble precast concrete members that form pillars easily and quickly.
The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a temporary fixing structure of a precast concrete member that can easily and quickly assemble a precast concrete member without requiring a support work. near Ru.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is a structure in which a precast concrete member is temporarily fixed to a concrete body in a state in which both mating surfaces are mated, and in a direction perpendicular to the mating surface from the mating surface of the concrete body. A threaded reinforcing bar supported by the concrete body is provided so as to protrude, and an insertion hole through which the threaded reinforcing bar can be inserted penetrates the mating surface of the precast concrete member to the end surface opposite to the mating surface The concrete body and the precast concrete member are inserted into the insertion hole in the state where the mating surfaces of the concrete body and the precast concrete member are aligned, and the screw is tightened by a nut member screwed at the end surface. It is characterized by being temporarily fixed by fastening a brace reinforcing bar.
Further, the present invention is a structure in which the first and second precast concrete members are temporarily fixed to the concrete body in a state in which the mating surfaces are aligned, and the base portion is supported by the concrete body. A threaded reinforcing bar projecting in a direction perpendicular to the mating surface 1 from the mating surface 1 of the concrete body, and the first precast concrete member is mated with the mating surface 2 of the concrete body; A mating surface 4 that is aligned with the mating surface 3 of the second precast concrete member and parallel to the mating surface 2 and an insertion hole that allows the threaded reinforcing bar to be inserted through the mating surface 4 are provided. The second precast concrete member allows the threaded reinforcing bar to be inserted from the mating surface 3. The concrete body and the first precast concrete member are provided with an insertion hole penetrating over the end surface opposite to the mating surface 3, and the threaded reinforcing bar is inserted into the insertion hole in a state where the mating surfaces 1 and 2 are aligned. And the first and second precast concrete members are temporarily fixed by being fastened by fastening the threaded reinforcing bar by a nut member screwed on the fourth mating surface. 3. The threaded reinforcing bar is inserted into the insertion hole in a state where the mating surfaces 4 are aligned, and is temporarily fixed by fastening the threaded reinforcing bar by a nut member screwed at the end surface. It is characterized by that.
Further, the present invention is a structure in which the first and second precast concrete members are temporarily fixed to the concrete body in a state in which the mating surfaces are aligned, and the base portion is supported by the concrete body. The first precast concrete member includes a first threaded reinforcing bar that protrudes in a direction perpendicular to the mating surface 1 from the mating surface 1 of the concrete body, and the first precast concrete member is mated with the mating surface 1 of the concrete body. A mating surface 4 that is aligned with the mating surface 3 of the second precast concrete member and parallel to the mating surface 2, and an insertion hole that allows the threaded reinforcing bar to be inserted through the mating surface 4 from the mating surface 2. And the second precast concrete member allows insertion of a threaded reinforcing bar from the mating surface 3. 3 and the first precast concrete member, the first threaded reinforcing bar is in the state in which the mating surface 1 and the mating surface 2 are aligned. The first and second precast concrete members are inserted into the insertion holes and temporarily fixed by fastening the threaded reinforcing bars by the nut members screwed on the fourth mating surface. A second threaded reinforcing bar that is screwed into the nut member in a state where the mating surfaces 3 and 4 are mated is inserted into the insertion hole, and the second member is screwed into the end surface by the nut member. It is characterized by being temporarily fixed by fastening a screw thread reinforcing bar.
Further, the present invention provides a method in which a reinforcing bar protruding from a concrete body is inserted into a cylindrical body of a mortar-filled joint embedded in a precast concrete member so that the precast concrete member is aligned with the concrete body. When the precast concrete member is temporarily fixed to the concrete body when the mortar is filled and the precast concrete member is connected and fixed to the concrete body, the reinforcing bar is connected to the precast concrete member at the side of the cylindrical body. A female screw that extends in a direction substantially perpendicular to the extending direction of the cylindrical body, and a male screw that engages with the female screw from the outer surface of the precast concrete member and that has a tip that presses the reinforcing bar. the shall be the feature.
[0005]
According to the temporary fixing structure of the present invention, with a simple configuration, installation of shoring, that Do is possible by omitting the removal operation for assembling the precast concrete parts quickly easily.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
First, a first embodiment in which the present invention is applied to a quadrant type box culvert will be described.
FIGS. 1 and 2 are explanatory views of the first embodiment. FIG. 1A is an exploded perspective view of a box culvert, and FIG. 1B is an exploded perspective view of a mating surface of a lower divided body. FIGS. 2A to 2E are explanatory views of the assembly process of the box culvert.
The quadruple-type box culvert 12 includes a lower divided body 14 (corresponding to the concrete body in the claims), two intermediate side walls 16 (corresponding to the first precast concrete member in the claims), and an upper divided body. The lower divided body 14, the two middle side walls 16, and the upper divided body 18 are each made of precast concrete.
[0007]
The lower divided body 14 includes a bottom wall 1402 and a lower side wall 1404 that stands up from both ends of the bottom wall 1402, and a flat mating surface 1404 </ b> A that fits the intermediate side wall 16 at the upper end of each lower side wall 1404. Is formed.
The intermediate side wall 16 is formed in a rectangular parallelepiped shape, and a flat mating surface 16A that fits the mating surface 1404A is formed at the lower end, and a flat mating surface 16B that fits the upper divided body 18 is formed at the upper end. Has been.
The upper divided body 18 is composed of an upper wall 1802 and upper side walls 1804 that are suspended from both ends of the upper wall 1802, and a flat mating surface 1804A that fits the mating surface 16B at the lower end of each upper side wall 1804. Is formed.
[0008]
The box culvert 12 is assembled and fixed via a mortar-filled joint and a reinforcing bar in a state where the lower divided body 14, the two intermediate side walls 16, and the upper divided body 18 have their corresponding mating surfaces aligned.
As is well known, the mortar filling joint includes a cylinder, a mortar inlet provided at the lower end of the cylinder, an air outlet provided at the upper end of the cylinder, and the like.
And, in a state where the cylindrical body is embedded and fixed in one of the two precast concrete members to be connected and fixed, and the reinforcing bar embedded and fixed in the other precast concrete member is inserted into the cylindrical body, Two precast concrete members are connected and fixed by filling mortar into the cylindrical body from the mortar inlet and fixing the reinforcing bar inside the cylindrical body.
In the present embodiment, four mortar-filled joints are embedded and fixed in the upper part of the lower side wall 1404 of the lower divided body 14 and the lower part of the upper side wall 1804 of the upper divided body 18, respectively. Reference numeral 20 denotes an opening that leads to the inside of a cylinder of a mortar filling type joint embedded in the upper part of the lower side wall 1404. In FIGS. 1 (A) and 1 (C), reference numeral 22 denotes the upper and lower sides of the intermediate side wall 16. 1 shows a reinforcing bar that is embedded and fixed in the cylinder of the mortar-filled joint, and in FIGS. 1B and 1C, reference numeral 24 denotes a detent pin that is fitted into the recess of the counterpart. .
[0009]
In the first embodiment, when the lower divided body 14, the two intermediate side walls 16, and the upper divided body 18 are assembled and fixed, temporary fixing is performed using the screw-off reinforcing bars 26 and the nut members 28 and 30.
That is, as shown in FIGS. 2A to 2E, the lower divided body 14 has a base portion supported by the lower side wall 1404 of the lower divided body 14 and a mating surface 1404A of the lower side wall 1404 (claims). 1), the threaded reinforcing bar 26 protrudes in a direction orthogonal to the mating surface 1404A1.
The intermediate side wall 16 has a mating surface 16A (corresponding to the mating surface 2 in the claims) that matches the mating surface 1404A of the lower side wall 1404, and a mating surface 1804A (in the claims) of the upper side wall 1804 of the upper divided body 18. The mating surface 16B (corresponding to the mating surface 4 in the claims) that is aligned with and parallel to the mating surface 16A, and the threaded reinforcing bar 26 can be inserted through the mating surface 16A. An insertion hole 1612 that penetrates through the surface 16B is provided.
The upper divided body 18 includes an insertion hole 1812 that allows the threaded reinforcing bar 26 to be inserted and penetrates from the mating surface 1804A of the upper side wall 1804 to the upper end surface 1804B opposite to the mating surface 1804A.
[0010]
The lower split body 14 and the two intermediate side walls 16 are threaded at the mating surface 16B while the threaded reinforcing bar 26 is inserted into the insertion hole 1612 with their mating surfaces 1404A and 16A being mated. The threaded rebar 26 is temporarily fixed by being fastened by the nut member 28.
In addition, the intermediate side wall 16 and the upper divided body 18 are threaded into the upper end surface 1804B while the threaded reinforcing bar 26 is inserted into the insertion hole 1812 in a state where the mating surfaces 16B and 1804A are aligned. The threaded reinforcing bar 26 is temporarily fixed by the nut member 30.
[0011]
The temporary fixing will be described in accordance with a procedure for assembling and fixing the lower divided body 14, the two intermediate side walls 16, and the upper divided body 18.
As shown in FIG. 1B and FIG. 2A, two female screw members 32 are embedded in each lower side wall 1404 of the lower divided body 14 so as to be exposed to the mating surface 1404A. A threaded reinforcing bar 34 is screwed to the lower half of the lower half, and the female threaded member 32 is firmly fixed to the lower side wall 1404 by the threaded reinforcing bar 34.
[0012]
Before assembling the two intermediate side walls 16 on the lower divided body 14, first, as shown in FIG. 2B, first, the screw thread rebar 26 is screwed into the screw hole of the female screw member 32 so that the threaded reinforcing bar 26 is formed on the lower side wall 1404. Standing at a right angle from the mating surface 1404. In this state, the threaded reinforcing bar 26 is formed to have a length substantially equal to the dimension obtained by adding the height of the intermediate side wall 16 and the height of the upper side wall 1804.
Next, as shown in FIG. 2 (C), the threaded reinforcing bar 26 is inserted into an insertion hole 1612 provided through the upper and lower sides of the intermediate side wall 16, and the reinforcing bar 22 of the intermediate side wall 16 is connected to the lower side wall 1404. Is inserted through the opening 20 into the cylinder of the mortar-filled joint embedded in the inner wall 16, the slip pin 24 of the lower side wall 1404 is fitted into the recess of the intermediate side wall 16, and the mating surface 1404 A of the lower side wall 1404 and the intermediate side wall 16 are inserted. Align the mating surface 16A.
[0013]
Next, as shown in FIG. 2 (D), the nut member 28 is screwed onto the threaded reinforcing bar 26 in the recess 1614 formed coaxially with the insertion hole 1612 on the mating surface 16B of the intermediate side wall 16. Then, the intermediate side wall 16 is fastened to the lower side wall 1404 by the screwing reinforcing bars 26 and the nut member 28, whereby the intermediate side wall 16 is temporarily fixed to the lower side wall 1404.
And in the state fixed temporarily in this way, mortar is inject | poured into the inside of a cylinder from the mortar injection port of the mortar filling type joint embed | buried under the lower side wall 1404, and this lower side wall is hardened | cured by this mortar hardening | curing 1404 and the intermediate side wall 16 are connected and fixed.
[0014]
Next, as shown in FIG. 2 (E), the threaded reinforcing bar 26 is inserted through the insertion hole 1812 provided through the upper side wall 1804 of the upper divided body 18 so as to pass the reinforcing bar 22 of the intermediate side wall 16. The mortar-filled joint cylinder embedded in the upper side wall 1804 is inserted through the opening 20, the slip pin 24 of the intermediate side wall 16 is fitted into the recess of the upper side wall 1804, and the mating surface 16 B of the intermediate side wall 16 is The mating surfaces 1804A of the side walls 1804 are matched.
Next, on the upper end surface 1804B of the upper side wall 1804, the nut member 30 is screwed into the threaded reinforcing bar 26 in a recess 1814 formed coaxially with the insertion hole 1812, and the threaded reinforcing bar 26 and the nut member 30 are screwed together. Thus, the upper side wall 1804 is fastened to the intermediate side wall 16, whereby the upper side wall 1804 is temporarily fixed to the intermediate side wall 16.
Then, in such a temporarily fixed state, mortar is injected into the inside of the cylindrical body from the mortar inlet of the mortar filling type joint embedded in the upper side wall 1804, and the mortar hardens, so that the intermediate side wall 16 and The upper side wall 1804 is connected and fixed, so that the assembly of the quadrant type box culvert 12 is completed.
[0015]
According to the present embodiment, the intermediate side wall 16 can be temporarily fixed to the lower divided body 14 and the upper side relative to the intermediate side wall 16 by a simple configuration using the screwed reinforcing bars 26 and the nut members 28 and 30. Since the divided body 18 can be temporarily fixed, it is possible to easily and quickly assemble the box culvert 12 without the work of attaching and detaching the support work.
In particular, since the box culvert 12 is often used by being connected in the horizontal direction, according to the present embodiment, the labor involved in assembling the box culvert 12 can be greatly reduced, and the construction period can be shortened. This is extremely advantageous for cost reduction.
[0016]
Next, a second embodiment will be described with reference to FIG.
FIGS. 3A to 3E are explanatory views of the assembly process of the box culvert according to the second embodiment.
The same parts as those in the first embodiment will be described with the same reference numerals. In the second embodiment, the two embodiments of the first embodiment are that the two threaded reinforcing bars 26A and 26B are used. Is different.
That is, as shown in FIGS. 3A to 3E, the lower divided body 14 has a base portion supported by the lower side wall 1404 of the lower divided body 14 and a mating surface 1404A of the lower side wall 1404 (claims). The first threaded reinforcing bar 26A protrudes in a direction orthogonal to the mating surface 1404A1.
[0017]
The intermediate side wall 16 has a mating surface 16A (corresponding to the mating surface 2 in the claims) matched to the mating surface 1404A of the lower side wall 1404, and a mating surface 1804A (claims) in the upper side wall 1804 of the upper divided body 18. The mating surface 16B (corresponding to the mating surface 4 in claims) and the first threaded reinforcing bar 26A can be inserted through the mating surface. An insertion hole 1612 penetrating from 16A to the mating surface 16B is provided.
The upper divided body 18 is provided with an insertion hole 1812 that allows the second threaded reinforcing bar 26B to be inserted from the mating surface 1804A of the upper side wall 1804 to the upper end surface 1804B opposite to the mating surface 1804A.
[0018]
The lower split body 14 and the two intermediate side walls 16 are inserted into the insertion hole 1612 with the first threaded reinforcing bar 26A in a state where their mating surfaces 1404A and 16A are mated, and the mating surface 16B The first threaded reinforcing bar 26 </ b> A is temporarily fixed by being fastened by the screwed nut member 28.
In addition, the intermediate side wall 16 and the upper divided body 18 are inserted into the insertion hole 1812 with a second screw-up reinforcing bar 26B screwed into the nut member 28 in a state in which the mating surfaces 16B and 1804A are aligned. At the same time, the second threaded reinforcing bar 26B is temporarily fixed by being fastened by the nut member 30 screwed into the upper end surface 1804B.
[0019]
The temporary fixing procedure according to the second embodiment is substantially the same as that of the first embodiment, but in the second embodiment, the two intermediate side walls 16 are temporarily fixed to the lower divided body 14. However, unlike the first embodiment in that the upper end of the first threaded reinforcing bar 26A is located in the upper and lower intermediate portions of the nut member 28 in the recess 1614, Before the divided body 18 is assembled, it is different from the first embodiment in that it is screwed into the nut member 28 and the second threaded reinforcing bar 26B is erected.
Also according to the second embodiment, the intermediate side wall 16 can be temporarily fixed to the lower divided body 14 with a simple configuration using the threaded reinforcing bars 26A, 26B and the nut members 28, 30. Since the upper divided body 18 can be temporarily fixed to the side wall 16, it is possible to easily and quickly assemble the box culvert 12 without attaching and detaching the support work, and the labor for assembling the box culvert 12 is greatly increased. This can be reduced, and it is extremely advantageous for shortening the construction period and reducing costs.
In the first and second embodiments, the case where the concave portion 1614 for accommodating the nut member 28 is provided on the mating surface 16B of the intermediate side wall 16 has been described. However, the mating surface 16B is formed as a flat surface. A recess for accommodating the nut member 28 may be provided on the mating surface 1804A of the upper side wall 1804.
[0020]
Next, a third embodiment will be described.
4 and 5 are explanatory views of the third embodiment. FIG. 4A is an exploded perspective view of the retaining wall, FIG. 4B is an exploded perspective view of the mating surface of the lower divided body, and FIG. FIG. 5A to FIG. 5D are explanatory views of a retaining wall assembly process.
The retaining wall 42 is configured in an L shape with a bottom wall 44 (corresponding to the concrete body in the claims) and a side wall 46 (corresponding to the precast concrete member in the claims), each of which is made of precast concrete. is there.
[0021]
A bulging portion 4402 bulging upward is provided at the end of the bottom wall 44, and a flat mating surface 4402 A is formed at the upper end of the bulging portion 4402.
The side wall 46 is formed in a rectangular parallelepiped shape. A flat mating surface 46A is formed at the lower end of the side wall 46 to be mated with the mating surface 4402A, and a flat end surface 46B parallel to the mating surface 46A is formed at the upper end. .
As in the first and second embodiments, the retaining wall 42 is assembled and fixed via a mortar-filled joint and a reinforcing bar in a state where the bottom wall 44 and the side wall 46 are aligned with their mating surfaces 4402A and 46A. Is done.
In the present embodiment, four mortar filling type joints are embedded and fixed in the bulging portion 4402. In FIG. 4B, reference numeral 48 denotes an opening that leads to the inside of the cylinder of the mortar filling type joint. 4 (A), reference numeral 50 denotes a reinforcing bar embedded in and fixed to the side wall 46 and inserted into the cylindrical body of the mortar filling type joint, and in FIG. 4 (B), reference numeral 52 denotes a displacement fitted into the counterpart recess. Indicates a stop pin.
[0022]
In the third embodiment, when the bottom wall 44 and the side wall 46 are assembled and fixed, temporary fixing is performed using the screw-off reinforcing bar 54 and the nut member 56.
That is, as shown in FIGS. 5A to 5D, the bottom wall 44 has a threaded reinforcing bar 54 that protrudes in a direction perpendicular to the mating surface 4402A from the mating surface 4402A with the base portion supported by the bulging portion 4402. It has.
In the mating surface 46A of the side wall 46, an insertion hole 4612 through which the threaded reinforcing bar 54 can be inserted is provided so as to penetrate to the end surface 46B.
The bottom wall 44 and the side wall 46 are threaded reinforcing bars by the nut members 56 screwed in the end face 46B, while the threaded reinforcing bars 54 are inserted through the insertion holes 4612 in a state where the mating surfaces 4402A, 46A are aligned. 54 is temporarily fixed by being fastened.
[0023]
Next, the temporary fixing procedure will be described.
As shown in FIGS. 4B and 5A, two female screw members 60 are embedded in the bulging portion 4402 of the bottom wall 44 so as to be exposed to the mating surface 4402A. A threaded reinforcing bar 62 is screwed to the half, and the female threaded member 60 is firmly fixed to the bulging portion 4402 by the threaded reinforcing bar 62.
Before assembling the side wall 46 to the bottom wall 44, as shown in FIG. 5B, first, the screw thread rebar 54 is erected perpendicularly from the mating surface 4402A by being screwed into the screw hole of the female screw member 60. . The threaded reinforcing bar 56 is formed in a length substantially equal to the height of the side wall 46 in the state of being erected in this manner.
[0024]
Next, as shown in FIG. 5C, the screw rebar 54 is inserted through an insertion hole 4612 provided so as to penetrate up and down the side wall 46, and the reinforcing bar 50 of the side wall 46 is embedded in the bulging portion 4402. The mortar-filled joint cylinder is inserted through the opening 48, the slip pin 52 of the bulging portion 4402 is fitted into the concave portion of the side wall 46, and the mating surfaces 4402A and 46A are aligned.
Next, as shown in FIG. 5D, the nut member 56 is screwed into the threaded reinforcing bar 54 in the recess 4614 formed coaxially with the insertion hole 4612 on the mating surface 46B of the side wall 46. Then, the side wall 46 is fastened to the bulging portion 4402 by the threaded reinforcing bar 54 and the nut member 56, whereby the side wall 46 is temporarily fixed to the bottom wall 44.
Then, in such a temporarily fixed state, the mortar is injected into the inside of the cylindrical body from the mortar inlet of the mortar filling type joint embedded in the bulging portion 4402, and the bottom wall 44 is cured by hardening the mortar. And the side wall 46 are connected and fixed.
[0025]
According to the present embodiment, since the side wall 46 can be temporarily fixed to the bottom wall 44 with a simple configuration using the threaded reinforcing bar 54 and the nut member 56, the retaining wall can be omitted without attaching and detaching the support work. 42 can be assembled simply and quickly.
In particular, since the retaining wall 42 is often used by being connected in the horizontal direction, according to the present embodiment, the labor involved in assembling the retaining wall 42 can be greatly reduced, and the construction period can be shortened. This is extremely advantageous for cost reduction.
In the first, second, and third embodiments, the case where the precast concrete members are connected to each other has been described. However, the present invention connects the precast concrete member to the concrete body placed on site. Of course, this also applies.
[0026]
Next, a fourth embodiment will be described.
FIGS. 6A to 6D are explanatory views when a precast concrete member is erected on a concrete floor, and FIGS. 7A to 7D are mortar filling types when a precast concrete member is erected on a concrete floor. 8A and 8B are explanatory diagrams of reinforcing bars erected on the concrete body, FIG. 8C is an explanatory diagram of the internal thread member, and FIG. 8D is a cylindrical body of a mortar filling type joint. An explanatory view of a female screw member portion is shown.
In the fourth embodiment, the present invention is applied to temporary fixing at the time of standing a rectangular parallelepiped precast concrete member 72 on a concrete floor 70 (corresponding to the concrete body in the claims) placed on-site. It has been done.
[0027]
The connection and fixing of the precast concrete member 72 to the concrete floor 70 is performed using a reinforcing bar 74 protruding from the concrete floor 70 and a mortar-filled joint 76 embedded in the precast concrete member 72. The member 72 is temporarily fixed using a female screw member 78 embedded in the precast concrete member 72 and a male screw 80 screwed into the female screw 7802 of the female screw member 78.
As the reinforcing bar 74, as shown in FIG. 8A, a threaded reinforcing bar 7402, or a deformed reinforcing bar 7404 joined to the threaded reinforcing bar 7402 by friction welding as shown in FIG. 8B is used. Can do.
The rebar 74 is erected at a right angle from the flat floor surface 70A by screwing with a female screw member 7002 embedded in the concrete floor 70 before the precast concrete member 72 is suspended. The female screw member 7002 is It has been established.
[0028]
As shown in FIG. 7B, the mortar filling type joint 76 includes a cylinder 7602, a mortar inlet 7604 provided in the lower part of the cylinder 7602, an air outlet 7606 provided in the upper part of the cylinder 7602, and the like. A total of eight are embedded along the lower four sides of the precast concrete member 72, and eight reinforcing bars 74 are provided correspondingly.
The mortar filling joint 76 is embedded so that the cylinder 7602 extends in the vertical direction, and the internal space of the cylinder 76 is opened to the flat lower surface 72A of the precast concrete member 72.
The lower part of the joining reinforcing bar 7202 embedded in the precast concrete member 72 is inserted into the cylindrical body 76, and the lower end of the joining reinforcing bar 7202 is located at the upper and lower intermediate part of the internal space of the cylindrical body 76, as shown in FIG. Reference numeral 7610 denotes a rubber packing.
[0029]
The female screw member 78 is a side portion of the cylindrical body 7602 of each mortar filling type joint 76, and when the lower surface 72A of the precast concrete member 72 is aligned with the floor surface 70A and the rebar 74 is inserted into the internal space of the cylindrical body 7602, It is embedded in the precast concrete member 72 so as to extend in a direction substantially perpendicular to the extending direction of the cylindrical body 7602 at a location facing the reinforcing bar 74. The female screw member 78 may be a metal insert that is commercially available for burying concrete.
In the present embodiment, as shown in FIG. 8D, a female screw continuous to the female screw 7802 of the female screw member 78 is formed in the cylindrical body 7602 where the tip of the female screw member 78 is located.
The female screw member 78 extends from the side surface 72B of the precast concrete member 72 so that the male screw 80 can be screwed, and the side surface 72B is formed with a recess 72C that accommodates the head of the male screw 80.
[0030]
Next, the temporary fixing procedure will be described with reference to FIGS.
First, as shown in FIG. 7A, the reinforcing bars 74 are screwed into a female screw member 7002 embedded in the concrete floor 70, and the eight reinforcing bars 74 are erected from the floor surface 70A.
Next, as shown in FIGS. 6 (A) and 7 (B), the precast concrete member 72 is suspended so that the rebar 74 is inserted into the internal space of the cylindrical body 7602 of each mortar filling type joint 76. The lower surface 72A of the precast concrete member 72 is aligned with the floor surface 70A and positioned.
Next, as shown in FIGS. 6B and 7C, the male screw 80 is screwed into the female screw 7802 of the female screw member 78 from the side surface 72 </ b> B of the precast concrete member 72.
[0031]
Then, the reinforcing bar 74 is pressed by the tip of the shaft portion of the male screw 80 in the internal space of the cylindrical body 7602.
Accordingly, in this embodiment, the reinforcing bars 74 are pressed by the eight male screws 80 at the lower part of the precast concrete member 72, and the precast concrete member 72 is in a stable state without requiring support by a support work. It is temporarily fixed with.
[0032]
Next, as shown in FIGS. 6C and 7D, mortar is filled from the mortar inlet 7604 while air in the inner space of the cylindrical body 7602 is discharged from the air outlet 7606. Then, the precast concrete member 72 is connected to the concrete floor 70 by the hardening of the mortar, and is fixed upright.
Finally, the recess 72C is closed with mortar so as to cover the head of the male screw 80, and the installation work of the precast concrete member 72 is thereby completed.
[0033]
According to the present embodiment, since the precast concrete member 72 that forms a pillar with respect to the concrete floor 70 can be temporarily fixed with a simple configuration using the female screw member 78 and the male screw 80, mounting and removing work of the support work can be saved. Thus, the precast concrete member can be easily and quickly installed.
In particular, when a large number of precast concrete members 72 are installed, according to the present embodiment, the labor involved in the installation of the precast concrete members 72 can be greatly reduced, the construction period can be shortened, and the cost can be reduced. This is extremely advantageous.
[0034]
Next, a modification of the fourth embodiment will be described with reference to FIGS.
FIGS. 9A to 9C are explanatory views of modified examples of the cylindrical body and male thread of the mortar filling type joint.
In FIG. 9A, a convex portion 7612 capable of contacting the reinforcing bar 74 is provided on the inner surface of the cylindrical body 7602 of the mortar filling joint 76 at a location facing the female screw 7802 of the female screw member 78.
In many cases, the surface of the reinforcing bar 74 used for embedding concrete is provided with irregularities. Therefore, by providing such a convex part 7612 on the inner surface of the cylindrical body 7602, the reinforcing bar 74 can be pressed by the male screw 80. This is advantageous in that the precast concrete member 72 is temporarily fixed to the concrete floor 70 more firmly.
[0035]
In FIG. 9B, a protrusion 7612A that gradually decreases in cross-sectional shape as it reaches the tip is formed at the tip of a convex portion 7612 provided on the inner surface of the cylindrical body 7602.
In addition, a protrusion 80A that gradually decreases in cross section as it reaches the tip is formed at the tip of the shaft portion of the male screw 80.
As described above, the surface of the reinforcing bar 74 used for embedding concrete is provided with irregularities. Accordingly, the projection 7612A is provided at the tip of the projection 7612 or the tip of the shaft of the male screw 80 is provided. If the projections 80A are provided on the portion, these projections 7612A, 80A can easily bite into the surface of the reinforcing bar 74, and the pressing of the reinforcing bar 74 by the male screw 80 is further ensured. This is advantageous when firmly fixed temporarily.
In FIG. 9C, the convex portion 7612 on the inner surface of the cylindrical body 7602 is constituted by a male screw 7620 that is screw-coupled to or welded to the cylindrical body 7602.
When the male screw 7620 is used as described above, the convex portion 7612 can be easily provided on the cylindrical body 7602 of the commercially available mortar filling joint 76.
[0036]
Next, a modified example of the female screw will be described with reference to FIG.
FIGS. 10A to 10C are explanatory views of modified examples of the internal thread.
In FIG. 10A, the female screw member 78 extends from the outer peripheral portion of the cylindrical body 7602 of the mortar filling joint 76 to the bottom of the concave portion 72C, and the female screw 7802 is formed over the entire inner peripheral surface of the female screw member 78. It is.
In FIG. 10B, an annular member 7822 is fitted and fixed at a position facing the reinforcing bar 74 on the outer periphery of the cylindrical body 7602, and the female screw 7802 is formed on the annular member 7822.
In FIG. 10C, a portion 7630 that faces the reinforcing bar 74 on the outer periphery of the cylindrical body 7602 is formed to be thicker than the other cylindrical body 7602, and the female screw 7802 is formed in the thick portion 7630. It is.
In the case of FIGS. 10A and 10B, it is optional whether a female screw continuous to the female screw 7802 is formed on the wall portion of the cylindrical body 7602 facing the female screw 7802 or a male screw insertion hole is simply formed. is there.
10B and 10C, the female screw 7802 and the recess 72C are connected by the male screw insertion hole 72D.
[0037]
Next, the arrangement structure of the female screw member will be described with reference to FIG.
FIGS. 11A and 11B are cross-sectional plan views for explaining the arrangement structure of the female screw member.
In FIG. 11A, a female screw member 78 is welded and fixed to a linear reinforcing bar 7220 arranged in a horizontal plane inside the precast concrete member 72.
In FIG. 11B, a female screw member 78 is welded and fixed to an annular fixing rebar 7222 disposed around a cylindrical body 7602.
In this way, when the reinforcing bars 7220 and 7222 are arranged in the formwork, the female screw member 78 can be easily disposed by welding and fixing to the reinforcing bars 7220 and 7222. In this state, concrete is placed in the formwork. A precast concrete member 72 is manufactured.
[0038]
In the fourth embodiment, the pre-cast concrete member 72 is temporarily fixed to the concrete floor 70 by pressing the reinforcing bars 74 with eight male screws 80 at the lower part of the pre-cast concrete member 72. In this way, the state in which the eight male screws 80 respectively press the reinforcing bars 74 is retained even after the mortar filled in the mortar filling type joint 76 is cured. Along with the hardened mortar 80 also functions as a connecting and fixing material for the precast concrete member 72 to the concrete floor 70.
Therefore, if the mortar filling joint 76, the female thread member 78, and the male thread 80 in the fourth embodiment are used, the connection strength of the precast concrete member 72 to the concrete floor 70 is maintained and the cylindrical body 7602 of the mortar filling joint 76 is maintained. The length can be made shorter than before.
[0039]
Furthermore, as shown in FIGS. 12A and 12B, when the convex portion 7612 that can contact the reinforcing bar 74 is provided on the inner surface of the cylindrical body 7602, the pressing of the reinforcing bar 74 by the male screw 80 is more effective. Since the connection strength is reliably increased, the length of the cylindrical body 7602 of the mortar filling type joint 76 can be shortened by the dimension L1 as compared with the case where the convex portion 7612 is not provided.
Furthermore, as shown in FIG. 12C, in addition to the female screw member 78 and the male screw 80 of the fourth embodiment, the precast concrete member 72 faces the reinforcing bar 7202 of the precast concrete member 72 at the side of the cylindrical body 7602. If a female screw member 78 extending in a direction substantially orthogonal to the extending direction of the cylindrical body 7602 is provided at a location, and a male screw 80 that is screwed into the female screw 7802 of the female screw member 78 is provided, the connection strength is further increased. The length of the cylindrical body 7602 of the mortar filling type joint 76 can be made shorter by the dimension L2 than in the case of (B).
[0040]
Note that, as shown in FIG. 12C, the internal thread member 78 and the external thread 80 for pressing the reinforcing bar 7202 of the precast concrete member 72 in the internal space of the cylindrical body 7602 of the mortar filling type joint 76, and the concrete floor 70 When the female screw member 78 and the male screw 80 for pressing the reinforcing bar 74 are used, the female screw member 78 and the male screw 80 for pressing the reinforcing bar 7202 of the precast concrete member 72 are connected to the air discharge port as shown in FIG. The internal thread member 78 and the external thread 80 for pressing down the reinforcing bar 74 of the concrete floor 70 may be disposed above the mortar inlet 7604. That is, the female screw member 78 and the male screw 80 may be disposed between the air discharge port 7606 and the mortar injection port 7604.
[0041]
Alternatively, as shown in FIG. 13B, a female screw member 78 and a male screw 80 for pressing the reinforcing bar 7202 of the precast concrete member 72 are disposed above the air discharge port 7606, and the reinforcing bar 74 of the concrete floor 70 is pressed. The female screw member 78 and the male screw 80 for attaching may be disposed below the mortar inlet 7604. That is, the female screw member 78 and the male screw 80 may be disposed outside the air discharge port 7606 and the mortar injection port 7604.
As shown in FIG. 13C, when the female screw 7802 is shortened by shortening the length of the female screw member 78 and the female screw 7802 and the recess 72C are connected by the male screw insertion hole 72D, the rotation of the male screw 80 is performed. The amount of movement is reduced, which is advantageous in simplifying the mounting operation of the male screw 80.
[0042]
In the fourth embodiment, the case where the precast concrete member is connected to the concrete body placed in the field has been described. However, the fourth embodiment is not limited to the connection between the precast concrete members. Applied.
[0043]
【The invention's effect】
According to the temporary fixing structure of precast concrete member of the invention as apparent from the above description, it is unnecessary to支保Engineering, that Do is possible to perform assembly of the precast concrete parts quickly easily.
[Brief description of the drawings]
FIGS. 1A and 1B are explanatory views of a first embodiment, in which FIG. 1A is an exploded perspective view of a box culvert, FIG. 1B is an exploded perspective view of a mating surface of a lower divided body, and FIG. It is a perspective view.
FIGS. 2A to 2E are explanatory views of a first embodiment, and FIGS. 2A to 2E are explanatory views of an assembly process of a box culvert. FIGS.
FIGS. 3A to 3E are explanatory diagrams of an assembly process of a box culvert according to the second embodiment.
4A and 4B are explanatory views of a third embodiment, in which FIG. 4A is an exploded perspective view of a retaining wall, FIG. 4B is an exploded perspective view of a mating surface of a lower divided body, and FIG. 4C is a perspective view of an end surface of an intermediate side wall; FIG.
FIGS. 5A to 5E are explanatory views of a third embodiment, and FIGS. 5A to 5E are explanatory views of a retaining wall assembling process. FIGS.
FIGS. 6A to 6D are explanatory views of a fourth embodiment, and FIGS. 6A to 6D are explanatory views when a precast concrete member is erected on a concrete floor. FIGS.
FIGS. 7A to 7D are explanatory views of a mortar-filled joint portion in a case where a precast concrete member is erected on a concrete floor.
FIGS. 8A and 8B are explanatory views of reinforcing bars standing on a concrete body, FIG. 8C is an explanatory view of a female screw member, and FIG. 8D is a cylindrical body and a female screw member portion of a mortar filling type joint. It is explanatory drawing.
FIGS. 9A to 9C are explanatory views of modified examples of a cylindrical body and a male screw of a mortar filling type joint.
FIGS. 10A to 10C are explanatory views of a modified example of the female screw.
FIGS. 11A and 11B are cross-sectional plan views for explaining an arrangement structure of female screw members, respectively.
FIGS. 12A to 12C are explanatory views of the length of a cylinder of a mortar filling type joint.
FIGS. 13A to 13C are explanatory views of an arrangement structure of female screw members and male screws.
[Explanation of symbols]
12 Box culverts 26, 26A, 26B, 54 Threaded reinforcing bars 28, 30, 56 Nut member 42 Retaining wall 72 Precast concrete member 76 Mortar filling type joint 78 Female thread member 80 Male thread

Claims (9)

A structure in which a precast concrete member is temporarily fixed to a concrete body in a state where both mating surfaces are aligned,
A threaded reinforcing bar supported by the concrete body is provided so as to protrude from the mating surface of the concrete body in a direction perpendicular to the mating surface,
In the mating surface of the precast concrete member, an insertion hole that allows the threaded reinforcing bar to be inserted is provided to penetrate to the end surface opposite to the mating surface,
In the concrete body and the precast concrete member, the threaded reinforcing bar is inserted into the insertion hole in a state where their mating surfaces are aligned, and the threaded reinforcing bar is fastened by a nut member screwed at the end surface. Temporarily fixed,
A temporary fixing structure for a precast concrete member. The first and second precast concrete members are temporarily fixed to the concrete body with the mating surfaces being matched,
The concrete body includes a threaded reinforcing bar that has a base supported by the concrete body and protrudes in a direction perpendicular to the mating surface 1 from the mating surface 1 of the concrete body,
The first precast concrete member includes a mating surface 2 that is mated with the mating surface 1 of the concrete body, a mating surface 4 that is mated with the mating surface 3 of the second precast concrete member and is parallel to the mating surface 2, An insertion hole that allows insertion of a threaded reinforcing bar and extends from the mating surface 2 to the mating surface 4;
The second precast concrete member includes an insertion hole that allows the threaded reinforcing bar to be inserted from the mating surface 3 to an end surface opposite to the mating surface 3;
The concrete body and the first precast concrete member are inserted into the insertion hole with the mating surface 1 and the mating surface 2 being aligned, and are screwed into the fourth mating surface. It is temporarily fixed by fastening the screw thread rebar by the nut member made,
The first and second precast concrete members are nut members screwed at the end surfaces while the screw rebars are inserted through the insertion holes in a state where the mating surfaces 3 and 4 are aligned. Is temporarily fixed by fastening the screw thread reinforcing bar,
A temporary fixing structure for a precast concrete member. The first and second precast concrete members are temporarily fixed to the concrete body with the mating surfaces being matched,
The concrete body includes a first threaded reinforcing bar that has a base supported by the concrete body and protrudes in a direction perpendicular to the mating surface 1 from the mating surface 1 of the concrete body,
The first precast concrete member includes a mating surface 2 that is mated with the mating surface 1 of the concrete body, a mating surface 4 that is mated with the mating surface 3 of the second precast concrete member and is parallel to the mating surface 2, and a screwdriver. An insertion hole that allows insertion of a reinforcing bar and extends from the mating surface 2 to the mating surface 4;
The second precast concrete member includes an insertion hole that allows the threaded reinforcing bar to be inserted and penetrates from the mating surface 3 to an end surface opposite to the mating surface 3;
The first pre-cast concrete member and the first precast concrete member are inserted into the insertion hole with the mating surface 1 and the mating surface 2 being aligned, and the fourth alignment is performed. It is temporarily fixed by fastening the screw thread reinforcing bar by a nut member screwed on the surface,
The first and second precast concrete members are inserted through the insertion holes through the second threaded reinforcing bars that are screwed into the nut member in a state where the mating surfaces 3 and 4 are mated. It is temporarily fixed by fastening the second screw thread reinforcing bar by a nut member screwed on the end face,
A temporary fixing structure for a precast concrete member. Insert the reinforcing bars protruding from the concrete body into the inside of the cylinder of the mortar filling type joint embedded in the precast concrete member, align the precast concrete member with the concrete body, and fill the inside of the cylinder with mortar. When precast concrete member is connected and fixed to the concrete body, the precast concrete member is temporarily fixed to the concrete body,
To the precast concrete member, a female screw extending in a direction substantially orthogonal to the extending direction of the cylindrical body at a location facing the reinforcing bar at the side of the cylindrical body,
A male screw that is screwed into the female screw from the outer surface of the precast concrete member, and whose tip presses the reinforcing bar,
A temporary fixing structure for precast concrete members, comprising: A female screw member is embedded in the precast concrete member so as to extend in a direction substantially orthogonal to the extending direction of the cylindrical body at a position facing the reinforcing bar at a side portion of the cylindrical body, and the female screw is formed on the female screw member. temporarily fixing structure of the precast concrete part according to claim 4, characterized in that it is. An annular member is fixed at a position facing the reinforcing bars at the outer periphery of the cylindrical body, wherein the internal thread is temporarily fixed structure of the precast concrete part according to claim 4, characterized in that it is formed on a member of the annular . The portion facing the reinforcing bar at the side portion of the cylindrical body is formed to be thicker than other cylindrical portions, and the female screw is formed at the thick portion. temporarily fixed structure of precast concrete members. Wherein the outer surface of the precast concrete parts is provided with a recess for accommodating the head portion of the male screw, temporary fixing structure of the precast concrete part according to claim 4, wherein the recess, characterized in that is closed with mortar. The female screw extends to an intermediate location between the cylindrical body and the concave portion, and a male screw insertion hole is provided between the intermediate location between the cylindrical body and the concave portion and the concave portion. temporarily fixing structure of the precast concrete part according to claim 8.

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