JP2003285316A - Precast pc member, manufacturing method therefor and joining method for precast pc member and another member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a precast PC member constituted so as to be capable of introducing prestress into the precast PC member and another member, a manufacturing method therefor, and a joining method. <P>SOLUTION: The intermediate part of a PC steel material is embedded in the cross section of the precast PC member 3 and the end of the PC steel material is fixed to the main body of the precast PC member 3 to impart prestress to the precast PC member 3. In this precast PC member 3, the preliminarily strained hollow steel rod 1 of a prestress introducing device 4 used for both of joining and concrete is embedded and arranged in the cross section of one end or both end parts of the precast PC member 3 on the leading end side thereof separately from a PC member. Prestress force is held to the hollow steel rod 1, and the base end of the device 4 is arranged so as to extend outwardly from the member end of the precast PC member 3 to constitute a joined part wherein the prestress force of the hollow PC steel rod 1 is held by the part 10 thereof. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast PC member manufactured by a pretensioning method, a method for manufacturing the same, and a method for joining the PC member and another member.

[0002]

2. Description of the Related Art Generally, PC piles, PC utility poles, diagonal members of concrete truss bridges, etc. used as pile foundations for structures are characterized by being elongated as precast PC members.

In the case of manufacturing such a PC member, it is suitable for a manufacturing method in which a mold into which concrete is put is rotated and compacted by centrifugal force. Also,
As a method for forming such a member into a prestressed concrete structure, it is disclosed in Japanese Patent Laid-Open No. 9-49230.

Such a PC member manufacturing method is, in principle, a method using an apparatus as shown in FIG.
Explaining with reference to the figure, the outer frame 3 at both ends of the side mold 30
PC steel material 35 is locked to both end plates 33, 34 provided inside 1, 32, and the jack 36 is shortened from the extended state while the jack reaction force is applied to the tension end end outer frame 32 to reduce the PC steel material 35. Then, the concrete 2 is put into the side frame 30, and after curing, after the concrete 2 reaches a predetermined strength, the jack 36 is released to introduce prestress to the concrete 2, for example, A precast PC member 40 such as a PC pile is manufactured.

The precast PC member 40 made of the PC pile thus manufactured is used, for example, in a tensile diagonal member 38 of a concrete truss bridge 37 as shown in FIG. Material (PC pile 4
0) When connecting 38, as shown in FIG. 15B, a steel flange 41 is attached to the end of the PC pile 40 in advance and bolted to the rating member 39 made of rating block concrete. Is common.

[0006] Such a conventional pretension system P
The characteristic of C member is that after the concrete is poured in a factory or the like, and the concrete develops the required strength, the jack at the end of the member is immediately released to release the tension of the PC steel material and introduce prestress into the concrete. However, the feature is that the tensile strength of the member is maximized.

As described above, in the conventional precast PC member, it has been shown that the tensile strength of the precast PC member is increased by the PC steel material, however, other members are joined by the PC steel material, and other There is no suggestion or disclosure regarding the fact that prestressing can be introduced into concrete members.

[0008]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The following problems were clarified in the manufacturing method of the C member 40 by the centrifugal molding method and the precast PC member 40.

The precast PC member 40 does not have means for introducing prestress to the concrete member to be joined to the end of the precast PC member 40, and the structure becomes complicated if the joining means is attached separately. High cost.

Since this is a manufacturing method using a manufacturing apparatus in which all PC steel materials must be arranged in a tensioned manner by taking a reaction force on the mold, the PC steel materials to be used are limited and the degree of freedom of the PC steel materials is low.

In addition to the above, since the PC member 40 itself does not structurally include a component for attaching another concrete member (for example, the rating member 39), it is joined to another concrete member. Is the PC member 40
There is only a method of providing a flange 41 to the and integrating them with bolts or nuts 42, and it was impossible to solidify the PC member 40 and other concrete by introducing prestress to other concrete members. .

When the PC member 40 made of PC pile and other concrete are to be joined, the PC pile 40 is previously prepared.
Temporarily assembled at other manufacturing factories, pour other concrete,
It had to be manufactured and the work was complicated.

The present invention makes it possible to join the precast PC member itself and other members with the hollow PC steel member while taking advantage of the advantage of increasing the tensile strength of the precast PC member itself with the solid PC steel member. It is an object of the present invention to provide a precast PC member capable of introducing prestress into the above concrete member, a manufacturing method thereof, and a joining method of the member and another member.

[0014]

In order to solve the above problems, the following precast PC member, a method for manufacturing the member and a method for manufacturing the same are provided.

In the precast PC member according to the first aspect of the present invention, the middle portion of the strained PC steel material is embedded in the cross section of the precast PC member, and the end portion of the PC steel material is fixed to the precast PC member main body. In the precast PC member 3 in which the precast PC member main body is prestressed, a pretensioned joint / concrete precast member is pre-stressed in a cross section of one end or both ends of the precast PC member 3 separately from the PC steel material. The distal end side of the hollow PC steel rod 1 in the stress introducing device 4 is embedded and arranged, and in the device 4, the reaction force PC steel rod 25 (6, 24) is inserted into the hollow PC steel rod 1 and the reaction force PC steel rod is inserted. The tension force is previously introduced into the hollow PC steel rod 1 while the reaction force is applied to 25, and the tension force is released to press the concrete. Less force is configured to be applied, and the bearing sleeve 7 provided with a stopper 19 which is screwed to the base end portion of the hollow PC steel bar 1, wherein the hollow PC steel rod 1
The prestressing force of the hollow PC steel rod 1 is held by the end holder 8 screwed to the tip of the precast PC member 3, and the base end of the device 4 is located outside the end of the main body of the precast PC member 3. The portion 10 that is arranged so as to extend to the outside and is arranged so as to extend outside the main body end portion 9 of the precast PC member 3 constitutes a joint portion in which the prestressing force of the hollow PC steel rod 1 is retained. It is characterized by being characterized.

Further, in the invention of claim 2, in the precast PC member according to claim 1, the hollow P
A female screw hole 26 is provided inside the tip of the C steel rod 1, an end holder 8 made of a male screw member is provided in the female screw hole 26, and a male screw portion 14 is provided outside the tip of the hollow PC steel rod 1. An anchor member 27 is detachably screwed to the male screw portion 14.

Further, in the invention of claim 3, in the precast PC member according to claim 1 or 2,
Prestressing device for multiple joints and concrete 4
Are provided on the precast PC member 3 and the length L of the joint portion of the plurality of joint / concrete prestress introducing devices 4 arranged to extend to the outside has the same length or It is characterized by having different lengths.

In the method for manufacturing a precast PC member according to claim 4, the reaction PC steel rod 25 is contained in the hollow PC steel rod 1.
(6, 24) is inserted, a tension force is previously introduced into the hollow PC steel rod 1 while the reaction force is applied to the reaction force PC steel rod 25, and a prestressing force is given to the concrete 2 by the release thereof. Further, the hollow PC steel rod 1 is composed of a support cylinder 7 having a stopper 19 screwed to the base end portion of the hollow PC steel rod 1 and an end holder 8 screwed to the tip end portion of the hollow PC steel rod 1. In the manufacturing method of the precast PC member 3 using the pre-stressing apparatus for joining and concrete 4 in which the pre-stressing force is retained, the tip side of the pre-stressing apparatus for joining and concrete 4 is arranged in the formwork. At the same time, the base end side of the joining / concrete prestress introducing device 4 is arranged so as to have a required connection length outside the end of the formwork, and the baseline side is opposite to the formwork. The take way the intermediate portion of the tensioned PC steel 35 is applied in the mold and then the concrete 52 is poured into the mold in, characterized in that the production of precast members.

A fifth aspect of the present invention is characterized in that, in the fourth aspect of the invention, the mold is rotated at a predetermined speed by the rotary drive roller 11 to perform centrifugal molding.

In the method for joining the precast PC member and the other member according to claim 6, the precast PC member 3 according to any one of claims 1 to 3 or the manufacturing method according to claim 4 or 5 is manufactured. After arranging the precast PC member 3 at a predetermined position for constructing a concrete structure, concrete for another concrete member is poured so as to embed the portion 10 extended to the outside of the precast PC member main body, and the concrete After exhibiting a predetermined strength, the stopper 19 in the support cylinder 7 provided with the stopper 19 in the joining / concrete prestress introduction device 4 is rotated and loosened, and both the precast PC member 3 and other concrete members are rotated. The prestress is introduced into the precast PC member 3 and other concrete members. Characterized by integrating the concrete structure.

[0021]

In the conventional pretensioning PC member, after the concrete is cast in a factory or the like, the jack at the end of the member is immediately released after the concrete has developed the required strength, and prestress is introduced into the concrete. However, the precast PC member simple substance of the present invention is provided with the PC steel material in a state in which the concrete is prestressed and the prestressing device 4 for joining the concrete which does not prestress the concrete. In the present invention as well, the prestressing device 4 for joining and concrete is pretensioned by a pretensioning method to manufacture a precast PC member, and the prestressing force is applied to the concrete of the precast PC member by releasing the tension of the hollow PC steel rod. Without feeding, after the precast PC member 3 is carried into the construction site of the PC structure, it is placed at a predetermined position of the structure and after the concrete of the other concrete member to be connected is placed,
The prestressing device for joining and concrete 4 which has been prestressed in advance is released, and the precast PC member 3 and other concrete members are prestressed at the same time to firmly connect the two members and the like. There is a big difference.

More specifically, the pretensioning type precast PC member 3 of the present invention is manufactured in a factory and at the time of shipment, the prestressing force (tensile force) is applied to the hollow PC steel material in the joining / concrete prestressing device 4. However, the prestress is not yet introduced into the concrete main body portion of the precast PC member 3. In this state, a trailer or the like is used, a support base is attached on the trailer, and the precast PC member 3 is loaded on the support base and transported to the construction site.

At this time, the precast P such as the PC pile 3
When the C member 3 is used, bending is applied to the PC pile 3, but the precast PC member 3 is inserted into the solid PC steel rod in which the tension is fixed, the hollow PC steel rod 1, and the hollow PC steel rod 1. Since the PC steel rods (having substantially the same strength as the hollow PC steel rods) 6 jointly have a reinforcing proof strength as a reinforcing bar, there is no fear of bending cracks.

The precast PC member 3 and other concrete members (members made of cast-in-place concrete) are
After the concrete is poured on site and the predetermined strength is developed, the stopper 19 of the joining / concrete prestress introducing device 4 is rotated by a wrench or the like to be loosened, so that the precast PC member 3 and other concrete members can be simultaneously pre-pressed. As stress is introduced, precast P at this point
The concrete structure including the C member 3 and the joined concrete member has a prestressed structure and can be joined more firmly than the method of joining with a bolt or a reinforcing bar.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described in detail based on the illustrated embodiments. 1 to 4 show the first embodiment of the present invention.
1A and 1B show a precast PC member and a structure thereof according to an embodiment, FIG. 1A is a side view showing the whole, and FIG.
2B is an enlarged partially cutaway vertical side view, FIG. 2A is an enlarged vertical side view showing the left end portion (on the different diameter holder side) of FIG. 1B, and FIG. 3A is FIG. ) Line A-A, FIG. 3 (b) is a line BB line cross-section of FIG. 2b, and FIG. 4 is an enlarged view of the right end portion (end holder side) of the prestressing device for concrete and the different diameter holder side. FIG. Figure 5 shows a precast PC made of PC pile
It is a vertical side view which shows one Embodiment of the manufacturing method of this invention in the case of centrifugal-forming the member 3.

An embodiment of a method of manufacturing the precast PC member 3 made of PC pile will be described in detail below with reference to FIGS.

On a yard near a precast PC member manufacturing apparatus such as a PC pile, the joining / concrete prestress introducing apparatus 4 used in the present invention (a unit that can be disassembled and assembled freely, and its detailed structure is PC steel material through hole 11 for inserting the PC steel material through hole 11 and the PC steel material through hole 35a for inserting the PC steel material through hole 11a.
The two steel caps 12 and 13 provided with are prepared and arranged in parallel at intervals.

The above-mentioned steel caps 12 and 13 are steel caps having a groove cross section, and one of the steel caps 12 has a through hole for inserting the mortar injection pipe 51 at the center of the groove bottom plate. Provided and each steel cap 12, 13
In the groove bottom plates 12a and 13a, a plurality of (four in the illustrated case) PC steel material insertion through holes 11 are provided at equal angular intervals, and the diameter is smaller than the PC steel material insertion through hole 11. The PC steel material insertion through hole 35a of the above is the through hole 11 in the circumferential direction.
Between them are equiangularly spaced.

Next, the through holes 11 and 3 for inserting the PC steel material described above.
The PC steel material 35 and the joint / concrete pre-stress introduction device 4 are inserted through the 5a, and are attached here. Here, the structure of the joint / concrete pre-stress introduction device 4 used in the present invention will be described. 2 to 4 will be described. In particular, FIG. 4 shows the structure of both ends of the joint / concrete pre-stress introducing apparatus 4, and the intermediate part has a constant shape and does not change. Therefore, description will be given with reference to FIG.

The joining / concrete prestressing device 4 is one form of the prestressing force introducing device for concrete using the hollow PC steel rod 1. After the prestressing is introduced into the concrete, the prestressing force is introduced into the hollow PC steel rod 1. The reaction force PC steel rod 6 is made a non-pull method (not pulled out) so that it remains in the hollow PC steel rod 1 (installed), and the reaction force PC steel rod 6 is pulled out. This is an advantageous form in terms of cost as compared with the case.

The male threaded portion of the hollow PC steel rod 1 having a male threaded portion 14 on the outer side of the longitudinal end portion of the steel hollow PC steel rod body 1a and a male threaded portion 15 on the outer side of the base end portion (rear end portion). 15 has two female screw holes of different diameters, a small female screw hole 16 at the tip and a large female screw hole 17 at the base end,
In addition, the female screw hole 16 at the tip end portion of the support cylinder 7 formed of a different diameter holder provided with a rotating tool engaging outer surface 18 such as a hexagon is screwed and connected.

In the female screw hole 17 at the base end of the support cylinder 7,
An external male thread portion 20 of a stopper 19 formed of a tubular tubular locking piece made of steel is screwed, and a hexagonal or the like outer surface 2 for engaging a rotating tool is provided outside the base end portion (rear end portion) of the stopper 19.
1 is formed, the rear end surface of the pressing engagement piece 23, which is disposed inside the support cylinder 7 and has a recess 22 at the tip end, is engaged with the front end portion of the stopper 19, and the pressing engagement piece 2 is formed.
In the recess 22 of the front end portion of 3, the one end side is inserted into the hollow PC steel rod 1 and the other end side is arranged so as to project from the rear end portion of the hollow PC steel rod 1. The rear end portion of the PC steel rod 24 is fitted, and the reaction force for removal PC steel rod 2
The rear end of the non-pulling reaction force PC steel rod 6 arranged in the hollow PC steel rod 1 as a whole is abutted on the front end of No. 4. In this embodiment, the removal reaction force PC steel rod 24 and the non-pull reaction force PC steel rod 6 are used.
With, the reaction force PC steel rod 25 for pushing is comprised.

The end holder 8 made of a male screw member is screwed into the female screw hole 26 inside the tip portion of the hollow PC steel rod 1, and the male screw portion 14 outside the tip portion of the hollow PC steel rod 1 is screwed.
Anchor member 27 made of a nut or the like is detachably screwed and fixed, and the tip end portion of the non-pulling reaction force PC steel rod 6 is in contact with the rear end surface of the end holder 8. Also,
In the middle portion of the male screw portion 15 on the rear end side of the hollow PC steel rod 1,
Anchor member 28 such as a nut is screwed.

When a tension force is introduced into the hollow PC steel rod 1 in the joining / concrete prestressing device 4 as described above, a simple explanation will be made by omitting the illustration. To support
The joint / concrete prestress introducing device 4 is arranged on the frame-shaped frame, and a hydraulic jack mounted on the frame-shaped frame is used to engage the distal end portion of the movable piston of the jack, and the stopper 19 The pushing locking bar 23 is pushed by the pushing steel rod inserted into the central hollow portion of the moving body toward the hollow PC steel rod 1, and the removal reaction force PC steel rod 24 and the non-pull (deposition) reaction Power PC
After the compressive force is introduced so as to push the steel rod 6 into the hollow PC steel rod 1, the support cylinder 7 or the stopper 19 which is free in that state approaches the pressing engagement piece 23 ( When the stopper 19 is moved forward to push the front end of the stopper 19 into engagement with the locking piece 23 and separate it from the frame, the hollow PC steel rod 1 is rotated. Can introduce tension into. It should be noted that the hollow PC steel rod 1 has a structure in which the tension force is retained even if the anchor member 27 is removed.

In the case of the first embodiment, the support cylinder 7 is removed from the hollow PC steel rod 1 and the concrete for joining is hardened and then hardened, so that the hollow PC steel rod 1 and the reaction force PC steel rod 6 for non-pulling. In order to improve the integrity of the concrete and improve the ultimate proof stress between concrete members, the anti-corrosion material 43 also used as a bonding agent, which is a time-curing synthetic resin adhesive prepared by mixing a retarder with a curing adhesive, is a hollow PC. The steel rod 1 has a long length shorter than the length dimension of the hollow PC steel rod 1 which is injected and filled in advance from the end opening portion of the steel rod 1 or at a proper time and which is arranged on the inner side of the hollow PC steel rod 1. The non-pull reaction force PC steel rod 6 is inserted, and then the short-length removal reaction force PC steel rod 24 engaged in series with the non-pull reaction force PC steel rod 6 is connected in series with the non-pull (stationary) reaction force PC steel rod 6. And push the hollow PC steel bar 1 from the opening end on the inlet side After disposed to protrude more than seen amount, the rear end male screw portion 15 of the bearing sleeve 7 hollow PC steel rod 1
It is advisable to introduce tension into the hollow PC steel rod 1 in a state where the stopper 19 is screwed onto the rear portion of the support cylinder 7 to balance the screw.

In this embodiment, the long non-pull (stationary) reaction force PC steel rod 6 and the short length reaction force PC steel rod 2 are used.
4 and the two long and short PC steel rods constitute a pushing reaction force PC steel material 25 arranged in the hollow PC steel rod 1, and the dimensions of the non-pull reaction force PC steel rod 6 and the removal reaction force PC The sum of the dimensions of the steel rod 24 is longer than that of the hollow PC steel rod 1, and the removal reaction force PC steel rod 24 projects outside the rear end of the hollow PC steel rod 1. Has been done. This projecting dimension is the maximum value of the amount of prestress that can be indirectly pushed by the jack. As described above, the joining / concrete prestress introducing device 4 is a device that can be mechanically disassembled or assembled.

As described above, a plurality of joining / concrete pre-stress introducing devices 4 (in the case of the drawing, the pre-stress introducing device 4 for joining / concrete in which a predetermined tension force has been introduced into the hollow PC steel rod 1 in advance. 8 on each side
5), and further explaining with reference to FIGS. 5, 2 and 3, from a right end side of a plurality of PC steel materials 35 (a total of 20 in the illustrated case) made of solid steel rods. , The left end steel cap 13, the middle spiral spiral bar 44 and the right end steel cap 12 are set in this order,
The concrete prestressing device 4 for the left side and the prestressing device 4 for the concrete on the right side are mounted at the time when the steel caps 12 and 13 are installed or at the end.

Further, the anchor members 27 on the end holder 8 side of all the joining / concrete pre-stress introducing devices 4 are removed, and the steel caps 12 are inserted from the tip side of each joining / concrete pre-stress introducing device 4 (unit). , 13 are set.

That is, first, on the yard, each P
The through holes 35a of the steel cap 13 arranged from the right end to the left end of the C steel material 35 are passed. Then, the steel cap 13 is moved to a predetermined position at the rear end portion (left end in FIG. 5). Further, the tip of the concrete prestress introduction device 4 is inserted from the outside of the steel cap 13 into the PC steel material insertion through-hole 11, and the base of the joining / concrete prestress introduction device 4 is provided on the outside of the cap 13. The prestressing introduction device 4 for concrete is inserted to a predetermined position so that the end side (rear end) secures a predetermined connection length L. The connection length is a portion of the portion of the prestressing introduction device 4 for concrete that projects from the end portion of the precast PC member main body, where prestressing can be introduced into the concrete member, and up to the tip surface of the support cylinder 7. .

Next, the spiral streaks 44 to be arranged in the section completed as a precast PC member are attached to each of the PCs.
The steel material 35 and the joint / concrete prestress introduction device 4 are surrounded so as to surround the tip side of the steel material 35 and the joint / concrete prestress introduction device 4.
Is arranged in a spiral shape over a predetermined length at the tip of the.

Next, the PC steel rods 35 are inserted into the through holes 35a of the steel cap 12 located on the tip (right end in the figure) side and moved to a predetermined position. Also, a steel cap 1
2 is inserted from the outer side of 2 into the right side of the prestressing device 4 for concrete, and the prestressing device 4 for joining and concrete is joined from the outer surface of the steel cap 12.
All the jointing and prestressing devices for concrete 4 were inserted from the right end steel cap 12 so as to secure a predetermined connection length so that the base end of the steel was separated by a predetermined distance and the connection length L was secured. After that, the anchor members 27 are screwed to the left and right concrete prestressing apparatuses 4. Further, each PC steel material 35 on the outer portion of the steel cap 12
A nut 60 is screwed onto the male screw portion on the end of the connector, and one end of the coupler 61 is screwed onto it. Although not shown, each of the steel caps 12, 13 and the spiral streak 44
The PC steel material 35 and the joining / concrete prestress introducing device 4 are bound together by a numbered wire or the like to form an integral unit.

The above-mentioned connection lengths L are determined by the steel caps 12,
Of the portion 10 arranged so as to extend outward from 13, a portion (joint portion) that can be attached to the concrete when the concrete is cast around the portion, and even among the portions that can be attached, The portion between the steel cap 12 and the steel cap 13 and each anchor member 27 is an important portion because it can sufficiently introduce a compressive force into the surrounding concrete.

In this manner, the PC pile reinforcing material unit assembled and unitized (the steel caps 12 and 13, the PC steel rods 35, the joining / concrete prestressing device 4 and the spiral stirrup were bound together. PC member reinforcement material unit 45 consisting of
Carry it to the pile manufacturing position and place it in the side mold 29a of the lower half, which is made in two. The side mold 29a
Is provided with a tensioning device 63 having a movable tension support plate 62 for tensioning, and a through hole 62a for inserting PC steel material in the movable tension support plate 62 for tensioning is provided for each PC steel material 35 in the outer portion of the steel cap 13. The end portion is inserted, and the nut 64 is engaged with the outer side of the tension movable bearing plate 62.

Further, the support cylinder 7 and the anchor member 28 and the hollow of the concrete pre-stress introducing device 4 are provided in the concrete pre-stress introducing device grooves 62b provided in the tension movable pressure bearing plate 62 at equal angular intervals. Through the middle portion of the PC steel rod 1, put the PC in place
The member reinforcing unit 45 is arranged.

The tensioning device 63 is provided with a bearing nut 66 screwed to the tip end side of a tension bolt 65 whose head is engaged with the tension movable pressure bearing plate 62, and the side form frame. The supporting nut 66 is engaged with the outer side of the end plate 67 connected to 29a, and the jack 6 is attached to the pulling bolt 65.
The movable piston 8 is configured to be connectable and detachable by a coupler (not shown) or the like. In addition, one end of a connecting rod 69 formed of a screw rod having male threads at both ends is connected to the coupler 61 on the right side in FIG. 5, and the other end of the connecting rod 69 is the other end of the side frame 29a. Fixed bearing plate 7 fixed to the section with bolts, nuts, etc.
0 is inserted into the fixed pressure bearing plate 70, is engaged with the outside of the fixed pressure bearing plate 70, and is engaged with the fixed pressure bearing plate 70 by a nut 71 screwed to the connecting rod 69.

Then, the jack 68 is shortened so that the tension bolt 65 and the tension movable bearing plate 62 can be shortened.
A tension force (tensile force) is introduced into each PC steel material 35 via the, and the reaction force is balanced through the side frame 29, the fixed pressure bearing plate 70, the connecting rod 69 and the like. Further, the bearing nut 66 is engaged with the end plate 67. In this manner, with the support nut 66 engaged with the end plate 67,
The jack 68 can be removed.

A nut screwed with the PC steel rod 35 may be arranged between the outer side of the steel cap 13 and the movable pressure support plate 62. When the nut is arranged in this way, each PC steel material is arranged. With the nut 35 being tensioned, the nut can be engaged with the outer surface of the steel cap 13 to prevent the displacement thereof, and the bearing nut 66 can be immediately engaged with and fixed to the steel cap 13 when loosened. be able to. The nut 60 on the right side has a similar function. In addition, in order to hold the position of the steel cap 13, the side mold 29 is appropriately used.
You may make it provide the convex part which engages with the outer surface of the steel cap 13 in (29a, 29b).

After doing this, the upper half side mold 29b
Is placed on the side mold 29a and is integrally closed with bolts or the like to form a cylindrical mold 29.

The lower half side molds 29a are placed on the rotary roller 46 with a flange, and the side molds 29a,
A fixed semi-annular flange is fitted to the intermediate portion of 9b to form an annular member rotated by the flanged rotary roller 46. In addition, the end plates 67 are attached to the end flanges 47 and 48 that are integrally provided on the end portions of the side molds 29a and 29b.
The fixed pressure plate 70 is fixed by bolts and nuts 49.

Next, a mortar injection pipe 51 is inserted through the fixed pressure plate 70 and the central through hole of the steel cap 12, and a predetermined amount of concrete (or mortar) 52 is molded from the mortar injection pipe 51. After injecting into the frame 29,
The rotary roller 46 is driven to rotate the mold 29 at a predetermined rotational speed to perform centrifugal molding. After the concrete (or mortar) 52 exhibits a predetermined strength, the bearing nut 66 is loosened (this causes the PC steel material 35 to prestress the concrete 52), the outer frame 29b is removed, and the nut 64 is removed. , The coupler 61 is removed from the PC steel material 35, the mortar injection pipe 51 is removed, the tension movable pressure bearing plate 62 is moved backward, and the nut 64 is engaged with the steel cap 13 with a washer appropriately interposed therebetween. The precast PC member 3 made of PC pile is completed by fixing and fixing 60 to the steel cap 12 with a washer interposed as appropriate to remove the side form 29a. (Figure 1
(State of FIG. 3)

As mentioned above, the precast PC of the present invention
In member 3, concrete (or mortar) 5
Even when 2 hardens, the tip side of the joining / concrete prestress introducing device 4 and the concrete 52 are adhered, but the tension force introduced into the hollow PC steel rod 1 is not released and the concrete is not released. The compression force (prestress) is not introduced into the (or mortar) 52.

At the time of introducing a tension force to the hollow PC steel rod 1 in the joining / concrete prestressing device 4 (in other words, the reaction force PC steel rod 6 as the compression rod and the reaction force PC steel rod for removal). The time point at which the compressive force is introduced into the pushing reaction force PC steel rod 25 consisting of) is performed in the manufacturing plant of the joining / concrete pre-stress introducing device 4. Such a device may be an appropriate device other than the above-mentioned device.

In this embodiment, as shown in FIG. 4, a pushing reaction force PC steel rod 25 composed of a reaction force PC steel rod 6 and a removing reaction force PC steel rod is used as a compression rod, and a hollow PC is jacked. The PC steel rod 25 while pulling the steel rod 1
Is compressed and the amount of deformation is rotated to move the stopper 19 to the rear end of the pressing and locking piece 23 to maintain the prestressing force. Moreover, even if the anchor member 27 is removed, the tip of the joining / concrete prestressing device 4 is a hollow PC.
Since the end holder 8 is screwed inside the end portion of the steel rod 1, the prestressing force is not released. Therefore, the anchor member 27 is removed, and the joining / concrete prestress introducing device 4 is attached to the cap 12,
It is devised so that it is not necessary to provide a large through hole in the steel plate by passing it through the steel groove bottom plate portion of 13.

Next, one mode of using the precast PC member 3 of the above embodiment will be described with reference to FIG. 6. FIG. 6 shows the P manufactured as described above.
The connection structure of the PC pile 3 and the grade concrete member 39 is shown when the precast PC member 3 (hereinafter also referred to as PC pile 3) made of C pile is used for the tensile diagonal member 38 of the concrete truss bridge 37.

The joint / concrete pre-stress introducing device 4 is connected to the grade concrete member 39 by the P
The length required for connection is extended from the upper and lower ends of the C pile 3. Further, the side on which the support cylinder (different diameter holder) 7 is mounted is placed outside and arranged at a predetermined position, and although not shown, a form and a necessary reinforcing reinforcing bar are arranged. By arranging the PC pile 3 in this way, the form is arranged so that the notches 53 for removing the support cylinder 7 are provided at the upper and lower points.

Next, a concrete grade 39a is placed,
After each grade concrete 39a develops a predetermined strength, the stopper 19 in the joining / concrete prestress introducing device 4 is loosened with a wrench to release the tension of the hollow PC steel material 1 and the grade of the diagonal diagonal member 38. Prestressing is simultaneously introduced into the concrete member 39. In particular, between the anchor members 27 and 28, the hollow PC steel rod 1, the concrete (or mortar) 52, and the grade concrete 39a.
Prestress is introduced by adhesion with.

As a result, prestress is also introduced to the connection surface A between the PC pile 3 and each graded concrete member 39, and the PC pile 3 and the graded concrete member 39 can be firmly joined. Then, as shown in FIG.
A rust preventive filler 73 such as mortar is provided in each notch 53.
To prevent the end of the hollow PC steel rod 1 from rusting.

FIG. 8 shows a form in which the precast PC member 3 is applied to a concrete underpass arch bridge 54.
The precast PC member 3 is used as a PC column 55, and the upper arch 56 made of concrete and the lower chord member 57 made of concrete are arranged between them or on the constructed lower chord member 57 made of concrete to join and join the lower side. The base end side of the prestressing device 4 for concrete (however, the supporting cylinder 7 is excluded) is embedded in the concrete lower chord member 57, and the supporting cylinder 7 (the holder of different diameter) in the upper joining and prestressing device 4 for concrete is embedded. 7) side is arranged so as to be embedded in the concrete upper arch 56 side, and although not shown, a notch (53) similar to the above is provided, and the support cylinder 7 is arranged in that portion, and the concrete upper arch is formed. 56 (or this and concrete lower chord 57)
After the concrete is poured and hardened to build, the stopper 19 is moved rearward, and the upper arch 56 and the lower chord member 57 are integrated through the PC support 55. When the precast PC member 3 is erected on the existing concrete lower chord member 57, a through hole or the like for fixing the base end portion of the concrete prestress introducing device 4 to the existing concrete lower chord member 57 as appropriate. Is provided and the base end side of the prestressing introduction device 4 for concrete is fixed with mortar or the like.

The support cylinder 7 of the cutout 53 is shown.
After removing the (different diameter holder 7) and removing the short-length removing reaction force PC steel rod 24, the portion of the notch 53 is filled with a rust preventive material such as mortar.

FIGS. 9 and 10 show a precast PC member 3 made of PC pile according to a second embodiment of the present invention. In this embodiment, a prestress introducing device for concrete is provided on the steel cap 13 side. 4 is provided, the PC steel material through hole 11 is not provided on the steel cap 12 side, and the joining / concrete prestress introducing device 4 is not provided. Further, the end holder 8 side is properly bound to the spiral reinforcing bar 44 and the like and held in position. Further, in the PC pile 3 in this embodiment, it is not necessary to provide the joining / concrete prestress introducing device 4 extending from the pile 3 on the lower side of the pile, and the end portion of the PC pile 3 for excavating with an auger. Is provided with a ring-shaped steel end plate 12 having a circular hole with the same inner diameter as the PC pile hollow portion. Since other configurations are the same as those of the precast PC member 3 of the first embodiment, different parts will be mainly described, and the same elements will be denoted by the same reference numerals and description thereof will be omitted.

In this embodiment, the precast PC member 3 is used.
This is a mode for applying to a mode in which the joining concrete member is provided only on one end side of the above, and therefore, the connection length is provided only on one side and has a joining portion only on one side.

11 and 12 show a form in which the precast PC member 3 made of the PC pile of the second embodiment is used for a bridge pier 58 of a bridge or a foundation 58 of a building.

That is, the bearing cylinder 7 (different diameter holder) of the precast PC member 3 is secured at the upper part to ensure a predetermined connection length, and the earth and sand that infiltrate the precast PC member 3 main body into the hollow 71 by the auger is discharged to the ground 71. On the other hand, a state is shown in which it is embedded at a predetermined position in the ground 71 and a concrete footing 59 is provided on the connection length side of the precast PC member 3 so as to embed these connection length portions.

In the case of this embodiment as well, the notch 5
After removing the three parts of the support cylinder 7 (different diameter holder) and removing the short-length removing reaction force PC steel rod 24, the portion of the notch 53 is filled with a rust preventive material 73 such as mortar. In this case, as shown in the figure, when a concrete or mortar superstructure (concrete pier 72 in the case shown) is built on the upper part of the support cylinder 7, the stopper 19 is loosened. After that, it may be embedded in concrete or mortar of the upper structure.

The precast PC member 3 of the present invention is not limited to the centrifugally molded PC pile as in the above-described embodiments, but as shown in FIG. Solid cross section). Reference numeral 75 is a concrete end plate.

The cross-sectional shape of the precast PC member 3 is not limited to a circular or rectangular hollow cross section,
A polygonal section such as a hexagonal section or an octagonal section, or an appropriate section shape such as a T-shaped section or an I-shaped section may be used, and the precast PC member of the present invention can be used for various purposes.

In the present invention, since the prestress introducing device 4 for concrete is arranged only on the end side of the precast PC member 3, as compared with the case where it is arranged over the entire length of the precast PC member 3, It is economical.

In the above embodiment, the precast P
Although a mode in which one separate member is integrally coupled to one side of the C member 3 is shown, when the present invention is carried out, a plurality of separate members are integrally coupled to one side of the precast PC member 3. Good. When the connection length L of the same length or different length from the end portion 9 of the precast PC member 3 main body is appropriately set as in the above embodiment, the support cylinder 7 is removed according to the outer surface shape of the members to be joined. The end of the hollow PC steel rod 1 afterward fits well.

In the above embodiment, the peripheral side plate 12
Although the steel caps 12 and 13 of the form including b and 13b are shown, when the present invention is carried out, the steel caps 12 and 1 are
3, the peripheral side plates 12b and 13b are omitted, and the groove bottom plate 1 is simply used.
A steel end plate having only 2a and 13a may be used.

[0070]

The effects of the present invention are as follows. The unit of the prestressing device for joining and concrete, which has been prestressed at the manufacturing factory of the prestressing device for joining and concrete, is a self-contained unit (with a steel rod inside and outside of the main body for tension and tension). The compression force is balanced and the release operation is possible), and it is not necessary to take the reaction force of the prestress force with the side formwork. In addition, since the prestress introducing device for concrete need only be arranged at the end portion of the precast PC member, it can be easily arranged and used for a long precast PC member. Further, since the precast PC member is prestressed by the PC steel material over its entire length, the precast P member
There is no risk of damage to the main body during transportation of the C member. Prestress can be introduced for the connection between the precast PC member and another concrete member, so that the connection can be made more robust than the connection with a reinforcing bar or a bolt. The end of the joining / concrete prestress introducing device extended from the precast PC member body can extend the connection length from the end, but depending on the application, the precast PC
Since the member can be extended at both ends or only one end, it can be used for various purposes. When joining the precast PC member and another member, the other member can be accurately placed by placing concrete on site. Place the end of the joining / concrete pre-stress introduction device in which tension is introduced into the hollow PC steel rod in the formwork,
A precast PC member can be easily manufactured by filling concrete or mortar in a mold and rotating the mold as needed to cure the concrete or mortar. The structure of the precast PC member of the present invention is a simple structure. Since the anchor member on the front end side (end holder side) in the joining / concrete prestress introduction device is removable, when manufacturing a precast PC member, a through hole smaller than the outer diameter of the anchor member is formed in the formwork or the like. It suffices to provide it, that is, to provide a small through-hole for inserting the hollow PC steel rod in the form, and even if the anchor member on the tip side is removed, the tension force introduced into the hollow PC steel rod is retained. can do.

[Brief description of drawings]

FIG. 1 is a precast PC according to a first embodiment of the present invention.
A member is shown, (a) is a partially cutaway side view,
(B) is a partially cutaway vertical sectional side view in which (a) is enlarged.

FIG. 2A is a vertical cross-sectional side view showing an enlarged left end portion of FIG. 1A.

3A is a sectional view taken along the line AA of FIG. 2A, and FIG. 3B is a sectional view taken along the line BB of FIG.

FIG. 4 is a partially cutaway enlarged vertical side view showing a different diameter holder side and an end holder side in the joining / concrete prestress introduction device in an enlarged manner.

FIG. 5 is a vertical cross-sectional side view for explaining the method for manufacturing a precast PC member of the present invention.

FIG. 6 is a partially longitudinal side view showing a form in which the precast PC member of the present invention is applied to a truss bridge.

FIG. 7 shows a state in which the stopper is loosened from the state of FIG. 6 and the precast PC member and the rating member are joined together, then the different diameter holder is removed, and the recess of the rating member is filled with rust preventive mortar. FIG.

FIG. 8 is a schematic side view showing a form in which the precast PC member of the present invention is applied to a lower arch bridge.

FIG. 9 is a precast PC according to a second embodiment of the present invention.
A member is shown, (a) is a partially cutaway side view,
(B) is a partially cutaway vertical side view.

10A is a partially longitudinal side view showing an enlarged part of FIG. 9B, and FIG. 10B is a sectional view taken along line CC of FIG.

FIG. 11 is a partial vertical cross-sectional side view showing a form in which the precast PC member according to the second embodiment is used and combined with a footing.

FIG. 12 is a partial vertical cross-section showing a form in which a stopper is loosened from the state of FIG. 11, the precast PC member and the footing are joined, the holder with a different diameter is removed, the recess is filled with mortar, and the pier is built. It is a side view.

FIG. 13A is a partially longitudinal side view showing one end side of the precast PC member according to the third embodiment of the present invention,
(B) is the DD sectional view taken on the line of (a).

FIG. 14 is a vertical sectional side view for explaining a conventional method for manufacturing a precast PC member.

FIG. 15 (a) is a side view showing a concrete truss bridge, and FIG. 15 (b) is a side view showing a joint structure of a grade portion of a diagonal member and a chord member in a conventional concrete truss bridge. .

[Explanation of symbols]

1 Hollow PC steel rod 1a Steel hollow PC steel rod body 2 concrete 3 Precast PC member 4 Prestressing equipment for concrete 6 PC steel rod 7 Support cylinder (different diameter holder) 8 end holder 9 member end 10 Part arranged so as to extend outward 11 PC Steel Through Hole 12 steel cap 13 Steel cap 14 Male thread 15 Male thread 16 small diameter female screw hole 17 Large diameter female screw hole 18 Outer surface for turning tool engagement 19 stopper 20 Male screw end 21 Outer surface for turning tool engagement 22 recess 23 Press locking piece 24 Removal reaction force PC steel rod 25 Reaction Force PC Steel Rod for Pushing 26 Female screw hole 27 Anchor member 28 Anchor member 29 formwork 29a side formwork 29b side formwork 30 side formwork 31 Outer frame 32 outer frame 33 End plate 34 End plate 35 PC steel 36 jacks 37 concrete truss bridge 38 Tensile diagonal 39 Grade member (grade concrete member) 40 Precast PC material 41 steel flange 42 bolts or nuts 43 Adhesive and rust preventive 44 spiral muscle 45 PC member reinforcement unit 46 Rotary roller with flange 47 end flange 48 end flange 49 bolts and nuts 51 Mortar injection tube 52 Concrete (or mortar) 53 cutouts 54 Concrete Underpass Arch Bridge 55 PC support 56 Concrete upper arch 57 Concrete lower chord 58 Piers or foundations 59 Concrete footing 60 nuts 61 coupler 62 Movable bearing plate for tension 62a through hole 62b groove 63 Tension device 64 nuts 65 Tension bolt 66 Bearing nut 67 End plate 68 jack 69 connecting rod 70 Fixed bearing plate 71 Ground 72 Concrete pier 73 Antirust filler 74 circular hole 75 Concrete end plate

Continued front page    (72) Inventor Atsushi Watanabe             2-1-1 Hirakawa-cho, Chiyoda-ku, Tokyo             Within Orient Construction Co., Ltd. F-term (reference) 2D059 AA05 BB39 CC03 GG55                 2E125 AA45 AB17 AC05 AG03 AG28                       BA02 BA24 BB08 BB30 BD01                       BE07 BF06 CA05 EA17                 2E163 FD02 FD04 FD25 FD39                 4G058 AA01 AB03 AB08 BA05 BA14                       EA04 EA13 EA41 FA01 FA37

Claims (6)

[Claims] 1. A precast PC member cross section has an intermediate portion of a PC steel material embedded therein, and an end portion of the PC steel material is fixed to the precast PC member main body so that prestress is applied to the precast PC member main body. In the precast PC member 3 that is present, the hollow PC steel rod 1 in the prestressed joining / concrete prestressing device 4 that is pretensioned is provided in the cross section of one end or both ends of the precast PC member 3 separately from the PC steel material. The distal end side is embedded and arranged, and in the device 4, a reaction force PC steel rod is inserted into the hollow PC steel rod 1 and a tension force is applied to the hollow PC steel rod 1 in advance while causing a reaction force to the reaction force PC steel rod. Is introduced so that a prestressing force is applied to the concrete by releasing its tension force, and is screwed to the base end portion of the hollow PC steel rod 1. The prestressing force of the hollow PC steel rod 1 is held by the support cylinder 7 having the stopper 19 and the end holder 8 screwed to the tip end portion of the hollow PC steel rod 1, and further, The base end portion of the device 4 is disposed so as to extend outside the main body end portion of the precast PC member 3, and the precast PC member 3 is disposed.
A precast PC member characterized in that a joint portion in which the prestressing force of the hollow PC steel rod 1 is held is constituted by a portion 10 arranged so as to extend outward from the main body end portion 9. 2. A female screw hole 26 is provided inside the tip of the hollow PC steel rod 1, an end holder 8 made of a male screw member is provided in the female screw hole 26, and the hollow PC is also provided.
The precast P according to claim 1, wherein a male screw portion 14 is provided on the outer side of the front end portion of the steel rod 1, and an anchor member 27 is detachably engaged with the male screw portion 14.
C member. 3. A plurality of joining / concrete pre-stress introducing devices 4 are provided on the precast PC member 3, and are arranged so as to extend to the outside of the plurality of joining / concrete pre-stress introducing devices 4. The precast PC member according to claim 1 or 2, wherein the lengths L of the joint portions of the bent portions 10 are the same or different. 4. A reaction force PC steel rod is inserted into the hollow PC steel rod 1 and a tension force is previously introduced into the hollow PC steel rod 1 while causing a reaction force to the reaction force PC steel rod to release it. By a prestressing force on the concrete 2 and having a stopper 19 screwed to the base end of the hollow PC steel rod 1 and a tip end of the hollow PC steel rod 1. The hollow PC by the open end holder 8
In the manufacturing method of the precast PC member 3 using the prestressing device for joining and concrete 4 in which the prestressing force of the steel rod 1 is held, in the tip side of the prestressing device for joining and concrete 4 in the formwork. In addition to arranging, the base end side of the pre-stress introducing device 4 for joining and concrete is arranged so as to have a required connection length outside the end of the mold, and a reaction force is applied to the mold. The intermediate portion of the PC steel material 35 which has been strained is placed in the formwork, and then the concrete 5 is placed in the formwork.
A method for producing a precast PC member, which comprises charging 2 to produce a precast member. 5. A method for manufacturing a precast PC member, comprising rotating the mold frame by a rotary drive roller 11 at a predetermined speed to perform centrifugal molding. 6. The precast PC member 3 according to claim 1, or the precast PC member 3 manufactured by the manufacturing method according to claim 4 or 5.
Is placed at a predetermined position to build a concrete structure, and then concrete for another concrete member is cast so as to embed the extended portion 10 on the outside of the precast PC member main body, and the concrete has a predetermined strength. After the expression, the stopper 19 in the support cylinder 7 provided with the stopper 19 in the joining / concrete prestress introducing device 4 is rotated and loosened to obtain a precast PC.
Prestress is introduced into both the member 3 and the other concrete member to integrate the concrete structure composed of the precast PC member 3 and the other concrete member, and the precast PC member and the other member are joined together. Method.