JP5864250B2 - Ready-made prestressed concrete product and method for producing the same - Google Patents

Description

The present invention relates to a ready-made prestressed concrete product including a plurality of cylindrical concrete bodies having different shapes or different types of performance, and a method for manufacturing the same.

  Examples of the shape of a cylindrical concrete body such as a concrete pile or a concrete pole include a general straight type, a diameter-expanding type in which the head side or the lower side is widened, and a node type having a node-like protrusion. Further, the node type includes an enlarged diameter node type in which the head or lower part is widened.

  In these types of cylindrical concrete bodies, axial streaks are arranged along the axial direction in a concrete main body made of concrete.

  In addition, the cylindrical concrete body in which such axial streaks are arranged has different strengths depending on the amount and type of the axial streaks, and according to the JIS standard, the A type, the B type, and the C type. And PRC piles using PC steel and different diameter steel bars in the axial direction.

  Furthermore, the cylindrical concrete body is distinguished by the wall thickness into a standard type standardized by JIS and a special wall thickness type different from this standard type.

  In installation work of such a cylindrical concrete body, depending on the desired performance based on the installation location, a plurality of tubular concrete bodies having different shapes with different shapes or different types of axial streaks and different performance Are connected and integrated at the installation site.

  And as a method of connecting a cylindrical concrete body, the connection method by a mechanical joint (for example, refer to patent documents 1) and the connection method by welding (for example, refer to non-patent documents 1) are known.

JP 2000-328557 A (page 3-5, FIG. 1 and FIG. 2)

Pile foundation construction manual, Japan Road Association, January 31, 2007, p. 94-95 and p. 100-103

  However, in the connection by the mechanical joint as in Patent Document 1 described above, the joint member as the end face metal member fixed to the end portion of the cylindrical concrete body is fixed through the connection member. There is a problem that it takes time and effort to manufacture the joint member and the connecting member, and the manufacturing cost is increased correspondingly, which is not economical.

  Further, in the connection by welding as described in Non-Patent Document 1 described above, considerable work time is required for welding work, and in order to prevent the occurrence of defects and ensure the quality of welding, it is possible to prevent rain, snow, and 10 m / During bad weather conditions such as strong winds of more than a second, welding work cannot be performed, and further, it is necessary to check the quality after welding is completed.

This invention is made | formed in view of such a point, and it aims at providing the ready-made prestressed concrete product which can be manufactured easily and economically, and its manufacturing method.

The ready-made prestressed concrete product according to claim 1 includes a plurality of cylindrical concrete bodies that are integrally formed and having different performances, and an intermediate fitting that is positioned between axial end surfaces of the plurality of cylindrical concrete bodies. and, wherein the plurality of cylindrical concrete body has an axial muscles for tension respectively arranged at a predetermined pitch in a circumferential direction, the axial direction of the intermediate gold instrument has one cylindrical concrete body located on the side those having a first fixing hole in which one end of the muscle is locked, and a second fixing hole other end of said axial muscle of the cylindrical concrete body located on the other hand side is locked .

The ready-made prestressed concrete product according to claim 2 is the ready-made prestressed concrete product according to claim 1, wherein the axial streak has a head-like end portion protruding outward from the other portion at the end, and The fixing hole and the second fixing hole have an insertion hole through which the head end of the axial streak can be inserted, and a locking hole which can be inserted through the axial streak and has a smaller diameter than the head end. Is.

Method for producing a prefabricated prestressed concrete products according to claim 3, engages an end of the axial muscle of the cylindrical concrete body located on one side of the intermediate sleeve to the first fixing hole of the intermediate sleeve , locking the other end portion of the axial muscle of the cylindrical concrete body located on the other side of the intermediate sleeve to the second fixing hole of the intermediate sleeve, the axial muscle of a plurality of adjacent cylindrical concrete body each tense said axial muscles while engaging the intermediate sleeve, in which molded integrally the plurality of cylindrical concrete bodies.

According to the invention described in claim 1, it comprises a plurality of integrally formed cylindrical concrete bodies, and an intermediate fitting located between the end faces of the plurality of cylindrical concrete bodies, Since the axial streaks of adjacent cylindrical concrete bodies are locked, it is possible to form a plurality of cylindrical concrete bodies integrally, and it is not necessary to connect a plurality of cylindrical concrete bodies at the installation site, making it easy and economical. Can be manufactured.

According to the second aspect of the present invention , the first fixing hole and the second fixing hole have a simple configuration in which the insertion hole and the locking hole are provided, and the shaft of the cylindrical concrete body located on one side of the intermediate metal fitting. can engage the other end of the axial muscle of the cylindrical concrete body located one end of the direction muscles on the other side of the locking Dekikatsu intermediate sleeve, it can be easily manufactured.

According to the invention described in claim 3, in order to integrally mold the plurality of tubular concrete bodies in a state where the ends of the axial streaks of the plurality of adjacent tubular concrete bodies are locked to the intermediate metal fittings, It is not necessary to connect a plurality of cylindrical concrete bodies at the installation site, and can be manufactured easily and economically.

It is sectional drawing which shows the structure of the ready-made prestressed concrete product which concerns on one embodiment of this invention. (A) is a block diagram which shows the state at the time of attaching an intermediate metal fitting to the axial reinforcement of a cylindrical concrete body, (b) is another cylindrical shape to the intermediate metal fitting attached to the axial reinforcement of the cylindrical concrete body. It is a block diagram which shows the state at the time of attaching the axial streak of a concrete body, (c) is a block diagram which shows the state by which the axial streak of the cylindrical concrete body was attached to the intermediate metal fitting. It is sectional drawing which shows the modification of this invention.

  Hereinafter, the configuration of an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3.

1 and 2, 11 is prefabricated prestressed concrete piles or a prefabricated prestressed concrete products, such as ready-prestressed concrete pole, the prefabricated prestressed concrete products 11, for example, the shape and type are different performance different concrete piles and concrete Cylindrical concrete bodies 12, 13 such as poles are formed integrally adjacent to each other. Further, a ring plate-shaped intermediate fitting 14 is provided between the axial end surfaces of the cylindrical concrete bodies 12 and 13.

  The cylindrical concrete bodies 12 and 13 are of a so-called straight type. The cylindrical concrete body 12 has a concrete body portion 15 formed of concrete into a cylindrical shape. The cylindrical concrete body 13 has a concrete body portion 16 which is formed into a cylindrical shape with concrete and has an inner diameter smaller than that of the concrete body portion 15.

  In these concrete main body portions 15 and 16, axial streaks 17 arranged in a substantially circular shape at a predetermined pitch in the circumferential direction are provided from one end portion to the other end portion in the axial direction. Further, in the concrete main body portions 15 and 16, circumferential bars 18 such as a scissor rebar or a spiral bar are arranged and bound to the outer periphery of the axial bars 17.

  As these axial direction reinforcement 17 and circumferential direction reinforcement 18, it is common to use a reinforcing bar, but you may use other metallic materials or nonmetallic materials with which intensity is secured.

The intermediate metal fitting 14 has a ring plate-like metal fitting body 20 as shown in FIGS. Further, the intermediate metal fitting 14 is formed through the metal fitting body 20, and the end portions of the axial streaks 17 for the cylindrical concrete body 12 are inserted from one direction and locked to be fixed to be fixed. And a plurality of second fixing holes 22 which are formed through the metal fitting body 20 and are axially inserted and locked in the axial direction 17 for the cylindrical concrete body 13 from the other direction.

  The first fixing holes 21 are arranged at a predetermined pitch in the circumferential direction of the intermediate metal fitting 14 so as to correspond to the pitch of the axial streak 17 of the cylindrical concrete body 12.

  The first fixing hole 21 has an insertion hole 25 through which the head-like end portion 23 located at the end of the axial stripe 17 can be inserted, and a diameter smaller than that of the head-like end portion 23 through which the axial stripe 17 can be inserted. And is formed in a bowl shape in the radial direction of the metal fitting body 20. The locking hole 26 is continuously cut inward from the insertion hole 25 in the radial direction (near the center).

  The second fixing holes 22 are arranged at a predetermined pitch in the circumferential direction of the intermediate metal fitting 14 so as to correspond to the pitch of the axial streaks 17 of the cylindrical concrete body 13, and the first fixing holes 21, the second fixing holes 22, Are alternately arranged in the intermediate metal fitting 14.

  The second fixing hole 22 has an insertion hole 27 through which the head-like end 24 located at the end of the axial stripe 17 can be inserted, and a diameter smaller than that of the head-like end 23 through which the axial stripe 17 can be inserted. Is formed in a bowl shape in the radial direction of the metal fitting body 20. The locking hole 28 is continuously cut from the insertion hole 27 radially inward (toward the center).

  Then, the axial streak 17 is moved in the radial direction toward the locking holes 26 and 28 in a state where the head-shaped end portions 23 and 24 are inserted into the insertion holes 25 and 27, so that the head-shaped end portions 23 and The shaft portion on the inner side of 24 is fitted into the locking holes 26 and 28, and the head-shaped end portions 23 and 24 are locked to the locking holes 26 and 28 and fixed.

  The first fixing hole 21 and the second fixing hole 22 are configured in a bowl shape in the radial direction of the metal fitting body 20, but may be configured in a bowl shape in the circumferential direction of the metal fitting body 20.

Such an intermediate member 14, the head-shaped end portion 23 located at one end in the axial direction muscle 17 of the tubular concrete body 12 positioned on one side of the intermediate member 14 is engaged with the first fixing hole 21 is fixed, the head shaped end 24 located other end of the axial muscle 17 of the cylindrical concrete body 13 located on the other side of the intermediate member 14 is fixed is engaged with the second fixing hole 22. That is, the intermediate sleeve 14, axial muscle 17 in the axial direction muscle 17 and the cylindrical concrete bodies 13 adjacent cylindrical concrete body 12 Ru locked.

Next, the manufacturing method of the ready-made prestressed concrete product 11 is demonstrated , referring FIG.

When manufacturing the ready-made prestressed concrete product 11, first, the axial reinforcement 17 and the circumferential reinforcement 18 for the cylindrical concrete body 12 are assembled.

As shown in FIG. 2 (a), one end of the axial streak 17 for the cylindrical concrete body 12 is inserted into the first fixing hole 21 of the intermediate metal fitting 14, and the head end 23 is locked and fixed. Then, an axial streak 17 for the cylindrical concrete body 12 is attached to the intermediate metal fitting 14.

  Next, the axial reinforcement 17 and the circumferential reinforcement 18 for the cylindrical concrete body 13 are assembled.

As shown in FIG. 2B, the other end of the axial streak 17 for the cylindrical concrete body 13 is inserted into the second fixing hole 22 of the intermediate metal fitting 14 attached to the axial streak 17 for the cylindrical concrete body 12. The head-like end portion 24 is locked and fixed by inserting the portion.

By locking and fixing the head-shaped end portion 24 in the second fixing hole 22, as shown in FIG. 2C, the axial streak 17 for the cylindrical concrete body 13 is attached to the intermediate fitting 14, An axial bar 17 for the cylindrical concrete body 12 and an axial bar 17 for the cylindrical concrete body 13 are connected via an intermediate metal fitting 14.

  Thereafter, similarly to the conventional method, the tension of the axial streak 17 in the mold rotated by a centrifugal molding machine (not shown), concrete placement, centrifugal molding by the centrifugal molding machine, curing is performed, and the cylindrical concrete body 12 And the cylindrical concrete body 13 are integrally molded and demolded.

  Next, effects of the above-described embodiment will be described.

According to the ready-made prestressed concrete product 11, the tubular concrete body 12 and the tubular concrete body 13 that are integrally formed, and the intermediate metal fitting 14 that is located between the ends of the tubular concrete bodies 12, 13 are provided. By this intermediate metal fitting 14, the axial streak 17 of the adjacent cylindrical concrete bodies 12, 13 is locked and fixed.

Therefore, when manufacturing the ready-made prestressed concrete product 11 , one end of the axial reinforcement 17 for the tubular concrete body 12 and the other end of the axial reinforcement 17 for the tubular concrete body 13 are connected to the intermediate metal fitting 14 . and Da設concrete while tensioning the axial muscle 17 after locking, for forming the adjacent tubular concrete bodies 12, 13 together, is necessary to connect a cylindrical concrete bodies 12, 13 at the installation site In addition, one intermediate metal fitting 14 can connect the axial streak 17 for the cylindrical concrete body 12 and the axial streak 17 for the cylindrical concrete body 13 to connect the cylindrical concrete body 12 and the cylindrical concrete body 13 with each other. Since it is not necessary to prepare expensive end fittings and connecting members for the joint portion, the joint portion can be manufactured easily and economically.

  That is, conventionally, in order to combine cylindrical concrete bodies having different performances, after molding the cylindrical concrete bodies having different performances, a plurality of pieces are installed at the installation site by using end fittings provided on the respective cylindrical concrete bodies. Although it was necessary to connect the cylindrical concrete bodies, different types of cylindrical concrete bodies 12 and 13 can be formed by one piece and can be installed as they are after the formation, so that the construction period and manufacturing cost can be reduced.

Intermediate member 14, the first fixing hole 21, and a through hole 25 and the locking hole 26, with a simple configuration the second fixing hole 22 and a through hole 27 and the locking hole 28, a cylindrical concrete can engage the axial muscle 17 for the body 12 and can engage the axial muscle 17 of tubular concrete body 13 from the other direction, it can be easily manufactured.

In the above-described embodiment , the first fixing hole 21 and the second fixing hole 22 are not limited to the configuration having the insertion holes 25 and 27 and the locking holes 26 and 28, but the shaft of the cylindrical concrete body 12. Any configuration that can lock one end of the directional bar 17 and the other end of the axial bar 17 of the cylindrical concrete body 13 can be selected as appropriate according to design conditions such as the shape and type of the axial bar 17 . Further, the number of the first fixing holes 21 and the second fixing holes 22 can be appropriately designed according to the number of the axial streaks 17 of the cylindrical concrete body 12 and the number of the axial streaks 17 of the cylindrical concrete body 13, The number of the first fixing holes 21 may be different from the number of the second fixing holes 22.

  Further, the shape of the first fixing hole 21 and the second fixing hole 22 is, for example, a straight hole, a tapered counterbore having a tapered hole bottom, a counterbored hole having a flat bottom, And it can select suitably from the taper hole opened in the taper shape.

  Further, the shape of the head-like end portion 23 and the head-like end portion 24 corresponds to the first fixing hole 21 or the second fixing hole 22 so that the fixing can be made to the first fixing hole 21 or the second fixing hole 22 having various shapes. The selected rivet head or fixing nut can be selected as appropriate.

  The intermediate metal fitting 14 has a ring plate shape whose outer circumference is the same as the outer circumference of the cylindrical concrete body 12 and the cylindrical concrete body 13, but is not limited to such a configuration. 14 may have any shape as long as the axial streak 17 of the cylindrical concrete body 12 and the axial streak 17 of the cylindrical concrete body 13 can be fixed, and the length of the outer periphery is the cylindrical concrete body 12 and the cylindrical concrete. The configuration may be shorter than the length of the outer periphery of the body 13.

The ready-made prestressed concrete product 11 includes two so-called straight-type tubular concrete bodies 12 and 13, an arrangement radius of the axial streak 17 for the tubular concrete body 12 connected via the intermediate metal fitting 14, and the tubular concrete. The arrangement radius of the axial streak 17 of the body 13 is the same, but it is not limited to such a configuration, and the number, shape, and type of cylindrical concrete bodies to be used are the desired performance based on the installation location. Depending on the design, it can be appropriately designed.

  For example, as in the modification shown in FIG. 3, a so-called diameter-expanded tubular concrete body 31 and so-called straight-type tubular concrete bodies 32, 33 may be provided.

  The cylindrical concrete body 31 has a concrete main body 34 formed of concrete. The concrete main body portion 34 includes a cylindrical base tube portion 35 and an enlarged-diameter portion 36 that is integrally formed from one end portion of the base tube portion 35 and has a larger outer periphery than the base tube portion 35.

  Further, in the concrete main body 34, axial streaks 37 are provided from one end to the other end in the axial direction.

  The axial streak 37 is arranged so that the arrangement radius increases from the other end side, which is the base cylinder part 35 side, toward the one end part side, which is the enlarged diameter part 36 side.

  The cylindrical concrete body 32 has a concrete body portion 38 formed of concrete into a cylindrical shape.

  Further, in the concrete main body portion 38, an axial streak 39 is provided from one end portion to the other end portion. The arrangement radius of the axial streak 39 is the same as the arrangement radius at one end of the axial streak 37 of the cylindrical concrete body 31.

  The cylindrical concrete body 33 has a concrete body 40 that is formed into a cylindrical shape with concrete and has an inner diameter smaller than the inner diameter of the concrete body 38.

  Further, in the concrete main body 40, an axial streak 41 is provided from one end to the other end. The arrangement radius of the axial stripe 41 is smaller than the arrangement radius of the axial stripe 39 of the cylindrical concrete body 32.

  Here, the axial streak 37 of the cylindrical concrete body 31 and the axial streak 39 of the cylindrical concrete body 32 are connected via an intermediate metal fitting. Further, the axial streak 39 of the cylindrical concrete body 32 and the axial streak 41 of the cylindrical concrete body 33 are connected via an intermediate metal fitting 43.

That is , one end of the axial stripe 37 is locked and fixed to the intermediate fitting 42, and the other end of the axial stripe 39 is locked and fixed to the intermediate fitting 42. Further, one end portion of the axial streak 39 is locked and fixed to the intermediate fitting 43, and the other end portion of the axial streak 41 is locked and fixed.

  As described above, by increasing the number of intermediate metal fittings used, the axial streaks of the number of tubular concrete bodies corresponding to the desired performance based on the installation location can be connected, and a plurality of tubular concrete bodies can be formed integrally.

Even if the shape of the concrete main body 34 and the concrete main body 38 is different from each other, such as the cylindrical concrete body 31 and the cylindrical concrete body 32, the difference in the shape of the concrete main body parts 34 and 38 is caused. Regardless, the axial streaks 37 and 39 can be integrally molded by being locked and fixed to the intermediate fitting 42.

Further, even when the arrangement radius of the axial streak 39 and the arrangement radius of the axial streak 41 are different as in the cylindrical concrete body 32 and the cylindrical concrete body 33, the first fixing (not shown) in the intermediate metal fitting 43 is performed. By shifting the position of the hole and the position of the second fixing hole (not shown) and changing the design such that the first fixing hole is positioned outside the second fixing hole, the axial streaks 39 and 41 are connected to the intermediate metal fitting 43. can be molded to the fixing to one body engages with the.

  Therefore, even in the case of combining different shapes and different types of performance, such as cylindrical concrete bodies 31, 32, 33, intermediate metal fittings 42, 39, 41 corresponding to the respective axial streaks 37, 39, 41, By simply using 43, the axial bars 37, 39, 41 can be connected, and after connecting the axial bars 37, 39, 41, the cylindrical concrete bodies 31, 32, 33 can be molded integrally, making it easy and economical. Can be manufactured.

INDUSTRIAL APPLICATION This invention can be utilized on industries, such as a manufacturing industry, a sales industry, and an industrial industry in connection with ready-made prestressed concrete products, such as a prestressed concrete pile or a prestressed concrete pole.

11 Ready-made prestressed concrete products
12 Cylindrical concrete body
13 Tubular concrete body
14 Intermediate bracket
17 Axial streak
21 First fixing hole
22 Second fixing hole
23 head end
24 head end
25 insertion hole
26 Locking hole
27 insertion hole
28 Locking hole
31 Cylindrical concrete body
32 Cylindrical concrete body
33 Cylindrical concrete body
37 Axial streak
39 Axial streak
41 Axial streak
42 Intermediate bracket
43 Intermediate bracket

Claims (3)

A plurality of cylindrical concrete bodies with different performance formed integrally;
An intermediate fitting located between the axial end faces of the plurality of cylindrical concrete bodies,
The plurality of cylindrical concrete bodies have axial streaks for tension arranged at a predetermined pitch in the circumferential direction,
The intermediate gold member, on the one hand a first fixing hole in which one end of the axial muscle of the cylindrical concrete body located on the side is locked, the axial muscle of the cylindrical concrete body located on the other side in prefabricated prestressed concrete products, characterized in that the other end of a second fixing hole which is engaged. The axial streak has a head-like end protruding outward from the other part at the end,
The first fixing hole and the second fixing hole include an insertion hole through which the head end of the axial streak can be inserted, and a locking hole which can be inserted through the axial streak and has a smaller diameter than the head end. Have
The ready-made prestressed concrete product according to claim 1. It engaged an end portion of the axial muscle of the cylindrical concrete body located on one side of the intermediate sleeve to the first fixing hole of the intermediate sleeve,
Locking the other end portion of the axial muscle of the cylindrical concrete body located on the other side of the intermediate sleeve to the second fixing hole of the intermediate sleeve,
Axial muscles adjacent plurality of cylindrical concrete body tense said axial muscles while locking the intermediate sleeve, respectively,
A method for producing a pre- stressed concrete product, wherein the plurality of cylindrical concrete bodies are integrally formed.

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