JP2000141349A - Production of pc panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a PC panel in which a process for laying a wave absorber such as a ferrite molded body in the inside of the PC panel is drastically simplified at the time for forming the PC panel. SOLUTION: The method for producing the PC panel incorporates a preparing process of a top force, a surface layer mortar-placing process, a descending process of the top force, a force feeding process of a wave absorber, a top force-lifting/mold releasing process, a bar-arrangement process and a lightweight concrete-placing process. The wave absorber 10 is positioned by the holder 55 of the top force 50 and is separably and temporarily retained on the holder by a temporarily adhering means or a retainment means. A fluid medium of surface layer mortar is placed in the inside of a formwork 70. The top force in which the wave absorber is temporarily retained in the prescribed position, is lowered on uncured surface layer mortar M and the wave absorber is pressed on surface layer mortar and at least partially pressed into surface layer motor. Prescribed curing time is secured after the wave absorber is pressed into the same.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a precast concrete panel (PC panel), and more particularly, to a method for manufacturing a radio wave absorbing PC panel in which a radio wave absorbing material is embedded at a predetermined position. is there.

[0002]

2. Description of the Related Art A PC panel method or a PC curtain wall for fixing a precast concrete panel (referred to as a "PC panel") to a main structural part of a building via a locking means such as a locking tool or a mounting tool capable of transmitting stress. The construction method
It is widely and practically used mainly as a method for constructing the outer walls of middle- and high-rise buildings.

[0003] With the recent increase in size or height of buildings,
Evil effects due to TV radio interference such as radio wave reflection (ghost) interference have been pointed out, and in order to solve such problems, anti-reflection type PC panels or PC curtain walls of various structures have been developed. As this type of anti-reflection type PC panel, a PC panel in which a radio wave absorbing material such as a ferrite tile is embedded near an exterior surface is known. For example, Japanese Unexamined Patent Publication
The radio wave absorption panel disclosed in JP-A-350285 is formed as a fiber-reinforced concrete molded panel having a two-layer structure, and a ferrite molded body is formed of a first concrete layer and a second concrete layer.
Interposed between concrete layers. The ferrite compact is bonded in a groove formed by pressing on the upper surface of the first layer concrete, and is embedded in the molded panel by the subsequent casting of the second layer concrete.

[0004]

SUMMARY OF THE INVENTION However, such a method of manufacturing a PC panel is characterized in that a concave groove having a predetermined shape is press-formed on the upper surface of the first layer concrete immediately after the first layer concrete is poured into a formwork. Since a groove forming step and a ferrite molded body bonding step of bonding the ferrite molded body to the concave groove with an adhesive after drying and curing the first layer concrete are required,
Not only does the work process become complicated overall, but the manufacturing time is prolonged.

In addition, the radio wave absorbing panel having the above-described structure has a first
A relatively expensive fiber-reinforced concrete is used as the layer and the second layer concrete, which increases the manufacturing cost of the radio wave absorbing panel and increases the construction cost of the building. For this reason, there is a need for a proposal for an improvement measure that can reduce the manufacturing cost of the radio wave absorption panel as a whole by using a structure in which a general-purpose material such as a first-class lightweight concrete can be used as a material of the structural panel body.

Further, there is known a radio wave absorbing panel having a structure in which a radio wave transmitting reinforcing member such as a non-conductive mesh is buried in the vicinity of the outer surface of the radio wave absorbing panel in order to prevent cracks or cracks on the outer surface of the PC panel. . However, the P
Since the C panel requires a reinforcing member burying process of burying a relatively expensive radio wave transmitting reinforcing member near the outer surface of the PC panel, there is a concern that the material cost and the manufacturing cost will rise. It is not desirable in reducing the construction cost.

SUMMARY OF THE INVENTION The present invention has been made in view of the foregoing, and an object thereof is to greatly simplify a process of embedding a radio wave absorbing material such as a ferrite molded body in a PC panel at the time of molding the PC panel. To provide a method for manufacturing a PC panel.

The present invention also ensures a sufficient adhesion area between the first layer molding material and the second layer molding material, and enables the use of general-purpose concrete such as a first-class lightweight concrete as the second layer molding material. Moreover, it is a second object of the present invention to provide a method of manufacturing a PC panel that can reliably avoid problems such as poor joints that may occur on joint surfaces of the first and second layer molding materials.

Another object of the present invention is to provide a method of manufacturing a PC panel capable of preventing a crack or a crack from appearing on an exterior surface without embedding a radio wave transmitting reinforcing member such as a non-conductive mesh near the exterior surface. This is the purpose of 3.

[0010]

The present inventors have conducted intensive studies to achieve the above object, and as a result, have found that the first-layer mortar or the first-layer concrete immediately after placing a radio wave absorbing material such as a ferrite tile. After at least partially press-fitting the second layer concrete, it was found that various problems such as simplification of the manufacturing process could be solved in circumstances, and based on such knowledge, the present invention was achieved. Things.

That is, the present invention has been made in order to achieve the above object.
A molding material made of concrete or mortar is poured into a mold in two stages, and a radio wave absorbing material is combined with a first layer molding material and a second layer molding material.
In a method for manufacturing a PC panel for manufacturing a radio wave absorbing panel interposed between a layer forming material and a PC panel, the radio wave absorbing material is positioned on a holding portion of an upper mold capable of holding the radio wave absorbing material and temporarily fixed to the holding portion. Then, a first layer molding material is poured into a lower mold capable of molding a PC panel, and the upper mold is moved to a position where the radio wave absorbing material is at least partially embedded in the uncured first layer molding material. Dropping onto the first layer molding material, at least partially press-fitting the radio wave absorbing material into the first molding material, and drying and hardening until the first layer molding material can restrain at least the radio wave absorbing material, A method for manufacturing a PC panel, comprising: raising an upper mold, allowing the radio wave absorbing material to remain in the first layer molding material, and then pouring the second layer molding material on the first layer molding material. provide.

According to the above configuration of the present invention, the radio wave absorbing material is pressed into the upper surface of the uncured first layer molding material and is at least partially embedded in the first layer molding material. Therefore,
The conventional groove forming step of press-forming grooves in the first layer molding material (first layer mortar or concrete) can be substantially omitted. In addition, the radio wave absorbing and bonding step of positioning and bonding the radio wave absorbing material in the concave groove can be omitted, and the second layer molding material can be poured into the mold immediately after the upper mold is raised. Can be greatly reduced. In addition, since the radio wave absorbing material can be reliably and accurately positioned on the holding portion of the upper mold under a favorable working environment,
It is possible to improve the accuracy of the position where the radio wave absorber is embedded in the panel. Thus, according to the PC panel manufacturing method having the above-described configuration, the process of embedding the radio wave absorbing material in the PC panel is greatly simplified, and low-cost mass production of the PC panel having the radio wave absorbing performance can be realized.

According to the present invention, in order to achieve the above object, in the method of manufacturing a PC panel having the above-mentioned structure, the upper die holding portion has a holding member for temporarily fixing a radio wave absorbing material, and the holding member is And a method of manufacturing a PC panel, comprising forming a pressing die for forming an uneven surface on the upper surface of the first layer molding material. According to the PC panel manufacturing method having such a configuration, the holder presses the first layer molding material when the upper mold descends, and shapes the upper surface of the first layer molding material into an uneven surface. Since the upper surface of the first layer molding material constitutes a joint surface of the first layer and the second layer molding material, the uneven surface increases the adhesion area between the first molding material and the second layer molding material, Prevents joint failures such as skin separation. As the interlayer adhesion area between the first layer and the second layer molding material increases, general-purpose concrete such as lightweight concrete can be used as the second layer molding material. Manufacture of a PC panel is realized. In addition, since the cracks or cracks are prevented from appearing on the exterior surface due to the increase in the adhesion area of the joint surface, it is necessary to embed a radio wave transmitting reinforcing member such as a non-conductive mesh near the exterior surface of the PC panel. Is reduced, and the provision of such a reinforcing member can be omitted.

According to another aspect of the present invention, there is provided a method of manufacturing a radio wave absorbing PC panel using a mold capable of placing a molding material made of concrete or mortar in two stages, and an upper mold capable of operating up and down.

An upper mold preparing step of positioning an electromagnetic wave absorbing material at a predetermined position on the upper mold and temporarily fixing the radio wave absorbing material to the upper mold; An upper mold lowering step of lowering the upper mold and press-fitting the radio wave absorbing material at least partially onto the uncured first layer molding material.
A press-fitting step and an upper mold ascending / releasing step in which the upper mold is lifted after the first layer molding material is dried and hardened to a strength capable of capturing the radio wave absorber, and the upper mold is separated from the radio wave absorber. When,
A reinforcing step of arranging structural reinforcing bars and / or reflective bars in the mold, and a second-layer molding material casting step of casting a second-layer molding material in the mold. Radio wave absorption P
Provided is a method for manufacturing a C panel.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to a preferred embodiment of the present invention, a method for manufacturing a PC panel includes an upper mold preparing step, a surface mortar placing step, an upper mold lowering step, a radio wave absorbing material press-in step, an upper mold rising / separating step. It includes a molding process, a reinforcing process, and a lightweight concrete placing process. The radio wave absorbing material is positioned on the upper holding tool, and is temporarily detachably fixed to the holding tool by a temporary bonding means such as an adhesive tape or an adhesive or a locking means. On the other hand, the surface mortar fluid is poured into a mold. The upper mold having the radio wave absorbing material temporarily fixed at a predetermined position descends onto the uncured surface mortar, and the radio wave absorbing material is pressed against the surface mortar and at least partially pressed into the surface mortar. A predetermined curing time is secured after press-fitting the radio wave absorber. The curing time is set to a drying and hardening time at which the surface mortar can exhibit a predetermined strength, and the strength is set to such an extent that the radio wave absorbing material restraining force of the surface mortar overcomes the radio wave absorbing material holding power of the holder. Is done. After the surface mortar has been dried and hardened to a desired degree, the upper mold is raised, and the upper mold is released from the surface mortar. Thus, the holder is separated from the radio wave absorbing material with the rise of the upper mold, the radio wave absorbing material is held by the surface mortar, the upper surface of the radio wave absorbing material is exposed at the bottom of the concave portion of the above-mentioned uneven surface, and the lightweight concrete is formed. The upper surface to which it can be attached, that is, the lightweight concrete attachment surface, is exposed in the formwork. Subsequently, reinforcing bars and reflective bars are arranged in the formwork, and lightweight concrete is cast into the formwork.

Preferably, the radio wave absorbing material is made of a ferrite tile or a ferrite molded body, and has a trapezoidal cross-sectional shape expanded in a surface mortar. Thereby, the surface mortar can reliably restrain the radio wave absorbing material to the mortar layer when the upper mold rises. Preferably, the holder of the upper mold is lowered to a position where the radio wave absorbing material is substantially completely embedded in the surface mortar, and the upper surface of the surface mortar exposes the upper surface of the uneven shape after the upper mold is raised. . The upper surface of the radio wave absorber is exposed on the bottom surface of the concave portion and forms an attachment surface that adheres to the lightweight concrete. More preferably, the holder has a band-shaped and flat support surface extending in the arrangement direction of the radio wave absorber in the upper mold, and the side edge of the holder has a slope wall portion extending outward from the radio wave absorber. The support surface having the inclined wall portion constitutes a pressing die for forming the concave side wall of the surface mortar into the inclined wall surface. In the upper mold preparing step, the upper mold is arranged in the work place with the support surface of the holder facing upward, and the radio wave absorbing material is sequentially arranged on the support surface of the holder to which an adhesive tape or the like is attached. You.
Such positioning work of the radio wave absorbing material having excellent workability enables short-time and high-precision positioning of the radio wave absorbing material, and the radio wave absorbing material arranged on the flat support surface is used in the press-fitting process. It can be accurately press-fitted into the surface mortar without causing problems such as excessive radio wave absorbing material irregularities or positional errors. The radio wave absorber arranged with high precision is desirable for improving the radio wave absorption performance of the radio wave absorber that converts radio wave energy into heat energy and the like. Enables mass production of radio wave absorbing PC panels.

[0018] In a preferred embodiment of the present invention, the inclined wall portion of the holder has irregularities or bores formed on the wall surface (slope) of the concave portion.
Bore shaping means is provided for molding. Bore shaping means, for example, consists of a bulging portion of a resin foam sheet,
The bulging part is embedded in the surface mortar in the press-in process,
After the upper mold rises, a bore is formed in the concave wall surface of the surface mortar. Due to such irregularities and the shape of the bore, the adhesion area between the surface mortar and the lightweight concrete increases, and a mechanical engagement structure by the bore is formed on the joint surface,
As a result, the peeling phenomenon of the surface mortar and the lightweight concrete is reliably prevented, and the occurrence of cracks or cracks in the surface mortar is suppressed.

In a further preferred embodiment of the present invention, a metal anchor member is disposed between the radio wave absorbers. Preferably, the lower half of the anchor member is inserted into the surface mortar immediately after the radio wave absorber press-fitting step, and is supported by the surface mortar with the drying and curing of the surface mortar, while the upper half of the anchor member is It protrudes upward from the upper surface of the mortar and is buried in lightweight concrete by casting lightweight concrete. The anchor member adheres to the surface mortar and the lightweight concrete, and functions as a stress transmitting means and a mechanical linking means for improving the integrity of both.

In a preferred embodiment of the present invention, a plurality of inserts are buried in the outer edge region of the surface mortar immediately after the radio wave absorbing material press-fitting step, and the reinforcing member is connected to each insert after the upper mold is raised. , Positioned in the formwork. The anchor member functions as a positioning unit and a support unit for the structural reinforcing bar and / or the reflecting bar, and the structural reinforcing bar and / or the reflecting bar is locked to the reinforcing member by a fastener such as a binding wire.

According to a preferred embodiment of the present invention, the surface mortar is made of fiber reinforced mortar mixed with reinforcing fibers such as vinylon fiber or glass fiber. It is desirable that the distance between the seating surface (lower surface) of the radio wave absorbing material after press-fitting and the lower surface of the surface mortar be set to a small dimension.
The size is set in the range of about 20 mm to about 20 mm.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1A is a perspective view schematically showing an entire configuration of a PC panel manufactured according to the manufacturing method according to the present invention, and FIG. 1B is a perspective view of a ferrite tile embedded in the PC panel. is there.

The PC panel 1 is composed of a panel structure 2 made of a lightweight concrete molding and a surface mortar 3 made of fiber reinforced mortar. In the panel structure 2, a structural reinforcing bar 5 arranged in a mesh shape in the vertical and horizontal directions and a reflective bar 6 made of a metal mesh are buried, and the panel can be attached to a main structural part of a building so as to transmit stress. A support fitting (not shown) is provided at a predetermined position. On the other hand,
The surface mortar 3 is made of fiber reinforced mortar mixed with reinforcing fibers such as vinylon fiber, and forms an exterior surface 4 of a building having radio wave permeability. The exterior surface 4 constitutes an exterior finish surface of the building outer wall or a lower ground surface of an exterior finish such as a spray tile.

The panel structure 2 and the surface mortar 3 are integrally joined via a joint surface 9 formed on an uneven surface.
A plurality of ferrite tiles 10 are interposed on the joint surface 9.
The ferrite tiles 10 are arranged in the height direction of the PC panel 1, and the respective ferrite tile rows are arranged at predetermined intervals in the width direction of the PC panel 1. As shown in FIG. 1 (B), each ferrite tile 10 is formed of a plate-like molded body having a trapezoidal cross section and a predetermined dimension, and has tapered left and right and front and rear peripheral surfaces 11 and a flat seating surface (lower surface). )
12 and a lightweight concrete attachment surface (upper surface) 13. A bolt insertion hole 16 is formed in the center of the ferrite tile 10, and a metal bolt 20 penetrates the bolt insertion hole 16. A pair of nuts 21 are screwed to the external threads of the metal bolt 20 on both sides of the bolt insertion hole 16, and the metal bolt 20 is fastened to the ferrite tile 1 by fastening the nut 21.
Planted perpendicular to 0.

FIG. 2A is a partial cross-sectional view of the PC panel 1, and FIG. 2B is a partial vertical cross-sectional view of the PC panel 1 along the line AA in FIG. 2A. Panel structure 2
The structural reinforcing bar 5 is constructed as a so-called double reinforcing bar composed of an indoor-side reinforcing bar including an indoor-side vertical bar 5a and a horizontal bar 5c, and an outdoor-side reinforcing bar including an outdoor-side vertical bar 5b and a horizontal bar 5d. The streaks 6 are arranged in the form of a mesh on the outdoor side bar arrangement. D10 (φ10mm)-D13
(Φ13 mm) deformed rebar can be suitably used. Further, as the reflection streaks 6, round steel having a diameter of about 6 to 10 mm can be preferably used. The structural reinforcing bar 5 is preferably arranged at an interval of about 100 to 200 mm, for example, 150 mm.
The rebars 6 are preferably arranged at intervals of 50 to 10
Bars are arranged at intervals of about 0 mm, for example, at intervals of 75 mm.

The joint surface 9 arranged at a predetermined distance from the reflection streaks 6 includes a projection 7 protruding toward the reflection streaks 6 and a groove 8 defined between the projections 7. And is substantially composed of The ridge portions 7 and the concave groove portions 8 are alternately arranged and extend in the vertical direction, so that a joint surface 9 having an uneven shape is formed over the entire surface mortar 3. Ferrite tile 1
0 is arranged at the groove bottom of the concave groove portion 8. The peripheral surface 11 of the ferrite tile 10 extending into the surface mortar 3 is:
The seating surface 12 expands into the surface mortar 3 and is completely embedded in the surface mortar 3 and adheres to the surface mortar 3.
Further, the attachment surface 13 of the ferrite tile 10 defines the groove bottom of the concave groove portion 8 and adheres to the lightweight concrete C constituting the panel structure 2. The metal bolt 20 penetrating through the center of the ferrite tile 10 has an upper half portion including a bolt head extending into the panel structure 2 and the lightweight concrete C.
Adheres together.

A slope 8 a extending from both sides of the attachment surface 13 to the top surface of the ridge portion 7 is provided between the groove portion 8 and the ridge portion 7.
Is formed. The inclined surface 8a forms the attachment surface 1 at a predetermined angle with respect to the attachment surface 13, for example, an angle of 45 to 60 degrees.
3 extend from both side edges toward the top edge of the ridge portion 7,
A plurality of bores 8b are arranged on the left and right slopes 8a. As shown in FIG. 2B, the bores 8b are vertically arranged at predetermined intervals, and the lightweight concrete of the panel structure 2 protrudes into the bores 8b.

An anchor member 30 made of a metal molded product such as a stainless alloy is disposed at the center of the ridge portion 7.
Each anchor member 30 arranged at a predetermined interval in the vertical direction includes a surface embedding portion 31 embedded in the surface mortar 3,
A buried portion 32 embedded in the panel structure 2, and each of the buried portions 31 and 32 has a bent portion 33 extending in the direction of the plane of the PC panel 1.

An insert 40 is embedded in the surface mortar 3 in the peripheral zone of the PC panel 1, and a hook-type anchor member 41 made of a metal molded product such as a stainless alloy is provided.
Locked to insert 40. The insert 40 includes an inner screw 42, and the lower end screw portion 43 of the anchor member 41 is
Fastened to the inner screw 42. The anchor member 41 includes bent portions 44 and 45 bent in the direction of the plane of the PC panel 1. The structural reinforcing bar 5 and the reflective bar 6 are locked to the anchor member 41 via a locking device such as a binding wire and a spacer or a bar arrangement jig.

The PC panel 1 configured as described above causes a mutual interference between the radio wave transmitted through the surface mortar 3 and the radio wave reflected by the reflecting muscle 6, and also reflects the radio wave due to the radio wave absorption performance of the ferrite tile 10 (see FIG. 1). ghost)
Exhibits damping effect and suppresses radio wave reflection (ghost) obstacles to nearby houses. The joint surface 9 between the structural panel portion 2 and the surface mortar 3 is formed in an uneven shape and includes a plurality of bores 8b and anchor members 30. Therefore, the effective attachment area of the joint surface 9 is In addition, the lightweight concrete C and the surface mortar 3
b and mechanical engagement by the anchor member 30;
As a result, the bonding strength of the joint surface 9 is increased, and the so-called skin separation phenomenon of the joint surface is reliably prevented.

FIG. 3 is a perspective view showing the entire structure of the upper die used for manufacturing the PC panel 1. FIGS.
FIG. 4 is a manufacturing process diagram showing a manufacturing process of the PC panel 1. PC
The panel manufacturing process includes an upper mold preparing step (FIG. 4A), a surface mortar placing step (FIG. 4B), an upper mold lowering step (FIG. 4C), a ferrite tile press-in step (FIG. 5A), and an upper mold raising / releasing step (FIG. 5A). 5B), a reinforcing arrangement step (FIG. 5C) and a lightweight concrete placing step (FIG. 5D).

In the upper mold preparing step, the upper mold 5 shown in FIG.
No. 0 is used as a molding jig for positioning and press-fitting the ferrite tile 10 at a predetermined position of the surface mortar 3. The upper mold 50 includes a rectangular frame 51 that constitutes a support base of the upper mold 50 and defines a peripheral region of the upper mold 50, a plurality of horizontal members 53 that bridge left and right horizontal members 52, A plurality of vertical legs 54 depending from the material 53. Frame 5
1 and the horizontal member 53 are composed of an assembly of steel members having a rectangular cross-sectional property, and both ends of the horizontal member 53 are fixed to the left and right horizontal members 52 and are spaced apart from each other by a predetermined distance in a direction orthogonal to the horizontal member 52. Are arranged at intervals. Each of the vertical legs 54 is made of a grooved steel material having an upper end fixed to the lower surface of the horizontal member 52.
4 hangs from the horizontal member 52 at a predetermined interval. A ferrite tile holder 55 is fixed to a lower end of the vertical leg 54. The holder 55 is made of a pair of left and right long steel mold members, and has a total length L corresponding to the overall height of the PC panel 1.
In the upper die preparing step (FIG. 4A), the upper die 50 is disposed at a reverse position with the vertical leg 54 facing upward, and the upper surface of the holder 55 has an upwardly oriented ferrite tile extending horizontally at a predetermined interval. Form a support band.

FIG. 6 is an enlarged perspective view of the tip of the vertical leg 54 showing the manner in which the ferrite tile 10 is mounted. The holder 55 includes a horizontal band portion 56 fixed to the tip of the vertical leg 54, and an inclined wall portion 57 connected to the band portion 56. The band plate portion 56 is fixed to the distal end surface of the vertical leg 54,
The inclined wall portion 57 extends outward at a predetermined angle with respect to the band plate portion 56. The joining angle between the band plate portion 56 and the inclined wall portion 57 is
The oblique angle is set, and the left and right holders 55 form a pressing die that converges toward the distal end of the vertical leg 54.

A double-sided adhesive tape 58 is adhered to the upper surface of the band plate portion 56, and the ferrite tile 10 to which the metal bolt 20 is fastened holds the holder 55 with the adhesion surface 13 facing downward.
And is positioned on the holder 55. The total width W of the upper surface of the holder 55 is the adhesion surface 1 of the ferrite tile 10.
3, the side edge region of the attachment surface 13 is temporarily adhered to the adhesive tape 58, and is held on the upper surface of the band plate portion 56. Thus, the ferrite tiles 10 are aligned on the holder 55 in a row.

A strip 60 made of a section of an aerated sheet
Is attached to the outer surface of the inclined wall portion 57. The band 60 is
It is composed of a strip-shaped resin base material 61 bonded to the inclined wall portion 57 and a cylindrical bulging portion 62 arranged on the base material 61 at a predetermined interval. The bulging portion 62 is made of a resin foam.

After a large number of ferrite tiles 10 are temporarily bonded on the holder 55 of the upper mold 50 in the upper mold preparing step,
The surface mortar casting step shown in FIG. 4B is performed.
The surface mortar material is cast on the steel plate bottom plate 71 of the formwork 70 in the surface mortar casting process. The mold 70 is
The PC panel 1 includes a square steel outer mold 72, and both side faces and both end faces are formed by the outer mold 72. As the surface mortar material, fiber reinforced mortar such as vinylon fiber can be suitably used. FIG. 4 shows a fiber-reinforced mortar fluid whose water / cement ratio, admixture amount, fine aggregate amount, etc. are appropriately adjusted.
As shown in (B), it is cast into the mold 70 to a predetermined thickness.

After the fiber-reinforced mortar fluid is cast on the bottom plate 71 and a simple iron leveling operation is performed, before the fiber-reinforced mortar is dried and hardened, the upper mold lowering step (FIG. 4C) and the ferrite tile press-in step are performed. (FIG. 5A) is performed. 7 and 8 are an enlarged cross-sectional view, a cross-sectional view taken along the line BB, and a cross-sectional view taken along the line CC showing the operation mode of the holder 55 in the upper mold lowering step and the ferrite tile press-fitting step.

Upper die 50 holding ferrite tile 10
Is oriented in a press-fitting posture with the vertical legs 54 facing downward, and is vertically lowered from above the formwork 70 by an elevating device (not shown) such as a crane (FIG. 4C: FIG. 7). The frame body 51 of the upper mold 50 is in contact with the upper end surface of the outer mold 72, and further lowering is restricted at the upper mold lowering position (press-fitting position) on the outer mold 72. Supported (Fig. 5
A: FIG. 8). The ferrite tile 10 temporarily bonded to the lower surface of the holding tool 55 is
Is pressed into the fiber reinforced mortar layer M inside. As shown in FIG. 8, the upper edge of the inclined wall portion 57 of the holder 55 stops at a position substantially coincident with the upper surface of the mortar layer M. Sloping wall 57
Separates the ridge portion 7 and the concave groove portion 8, and the bulged portion 62 of the strip 60 is embedded in the fiber reinforced mortar. The upper surface of the mortar layer M is smoothed by an iron leveling operation, and the anchor member 30 and the insert 40 are embedded in predetermined positions of the mortar layer M. At the press-fit position shown in FIG.
The inclined wall portion 57 forms the inclined surface 8a of the concave groove portion 8, the bulging portion 62 shapes the bore 8b, and the ferrite tile 10
It is substantially completely embedded in the mortar layer M. Since the adhesive surface 13 of the ferrite tile 10 is covered with the adhesive tape 58 and the inflow of the fiber reinforced mortar is prevented by the inclined wall portion 57, the adhesion of the fiber reinforced mortar to the adhesive surface 13 is prevented. The metal bolt 20 fastened to the center of the ferrite tile 10 has a lower end embedded in the fiber reinforced mortar and an upper half protruding upward.

The casting thickness Ta of the fiber-reinforced mortar in the surface mortar casting step is 20 to 40 mm, for example, 25 mm.
mm, and the thickness (height) Tb of the ridge portion 7 after the ferrite tile press-fitting step is 30 to 60 mm, for example,
The thickness Tc of the lower surface of the ferrite tile 10 is set to 10 to 30 mm, for example, 15 mm.

After completion of the ferrite tile press-fitting step, about 1
A primary curing period of 0 to 15 hours, for example, about 12 hours, is transiently secured, and the mortar layer M is dried and hardened to a predetermined moisture content and strength. After the lapse of the primary curing period, the upper mold raising / releasing step (FIG. 5B) is immediately performed. By appropriate setting of the primary curing period, the fiber-reinforced mortar is dried and hardened to the extent that a predetermined strength is exhibited. That is, the primary curing period is set to a time that can be developed to such an extent that the holding power of the ferrite tile of the fiber-reinforced mortar overcomes the adhesive strength of the adhesive tape 58.

In the upper mold raising / releasing step, the upper mold 50
As shown in FIG. 5 (B), is lifted vertically upward by a lifting device (not shown), and the holder 55 and the band 60 arranged at the lower end of the vertical leg 54 are separated from the mortar layer M, As a result, the mortar surface in the form of projections and depressions in which the ridge portions 7 and the groove portions 8 are alternately arranged is exposed in the mold 70 together with the plurality of bores 8b arranged on the slope 8a of the groove portion 8. I do. The ferrite tile 10 is held by the mortar layer M, while the adhesive tape 58 of the strip portion 56 is peeled off from the adhesion surface 13 of the ferrite tile 10, leaving the ferrite tile 10 on the mortar layer M and the upper die 50. Rise together. Thus, the attachment surface 13 of the ferrite tile 10 is exposed in the mold 70.

FIG. 9 shows the details of the rebar arrangement step (FIG. 5C) performed subsequent to the upper mold lifting / releasing step. In the reinforcing process, the lower end of the hook type anchor member 41 is screwed into the insert 40,
Are arranged in the outer edge region of the mortar layer M at a predetermined interval. The end of the structural reinforcing bar 5 is bound to the hook-type anchor member 41 by a binding wire or the like, and double reinforcing bars including the vertical bars 5a, 5b and the horizontal bars 5c, 5d are installed in the formwork 70.

After completing the reinforcing work, a lightweight concrete placing step shown in FIG. 5D is performed. The lightweight concrete fluid C is cast to the upper end surface of the outer mold 72 (cast thickness Td), and the upper surface of the lightweight concrete fluid is smoothed by the iron leveling operation. Water / lightweight concrete
Class 1 lightweight concrete in which the cement ratio, the amount of admixture, the amount of coarse and fine aggregates, etc. are appropriately adjusted is suitably used. A secondary (final) curing period of a predetermined time is ensured after the casting of the lightweight concrete, and the lightweight concrete C exhibits the desired strength. Thereafter, the PC panel 1 is released from the mold frame 70, and the PC panel 1 shown in FIG. 1 is formed. If desired, steam curing is applied to the lightweight concrete C in the secondary curing step.

Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above-described embodiments, and various modifications may be made within the scope of the present invention described in the appended claims. It is needless to say that the modification or the modification is also included in the scope of the present invention.

For example, the structure and shape of the upper and lower molds, P
The form and dimensions of the C panel, or the materials and components of the first and second layer molding materials, can be arbitrarily changed according to the purpose of use of the PC panel.

[0046]

As described above, according to the construction of the present invention as set forth in claims 1 to 13, the step of embedding a radio wave absorbing material such as a ferrite molded body in the PC panel at the time of molding the PC panel is greatly reduced. A PC panel manufacturing method that can be simplified can be provided.

Further, claims 2, 3, 4, 8, 9 and 12
According to the configuration of the present invention, a sufficient adhesion area between the first layer molding material and the second layer molding material is ensured, and the use of general-purpose concrete such as a first-class lightweight concrete as the second layer molding material. In addition, it is possible to provide a method of manufacturing a PC panel that can reliably avoid problems such as poor joints that can occur on the joint surfaces of the first and second layer molding materials.

Further, according to the configuration of the present invention described in claims 2, 3, 4 and 9, a radio wave transmitting reinforcing member such as a non-conductive mesh is not buried in the vicinity of the outer surface, and the outer surface of the outer surface is not buried. It is possible to provide a method for manufacturing a PC panel that can prevent the occurrence of cracks or cracks.

[Brief description of the drawings]

FIG. 1 shows a PC manufactured by a manufacturing method according to the present invention.
FIG. 1B is a perspective view schematically showing the entire configuration of the panel (FIG. 1A) and a perspective view of a ferrite tile that can be embedded in a PC panel (FIG. 1B). .

FIG. 2 is a partial transverse sectional view (FIG. 2A) and a partial longitudinal sectional view (FIG. 2B) of the PC panel.

FIG. 3 is a perspective view showing the entire structure of an upper die used for manufacturing a PC panel.

4 is a manufacturing process diagram showing a manufacturing process of a PC panel, in which an outline of an upper mold preparing step (FIG. 4A), a surface mortar placing step (FIG. 4B), and an upper mold lowering step (FIG. 4C) are illustrated. I have.

FIG. 5 is a manufacturing process diagram showing a manufacturing process of a PC panel, in which a ferrite tile press-fitting process (FIG. 5A),
The outline of the release process (FIG. 5B), the reinforcing process (FIG. 5C), and the lightweight concrete placing process (FIG. 5D) is shown.

FIG. 6 is an enlarged perspective view of a tip end of a vertical leg of the upper die, showing a mode of attaching the ferrite tile to the upper die.

FIG. 7 is an enlarged cross-sectional view (FIG. 7A) and a cross-sectional view taken along the line BB (FIG. 7B) showing an operation mode of the ferrite tile holder in the upper mold lowering step.

FIG. 8 is an enlarged cross-sectional view showing an operation mode of the ferrite tile holder in the ferrite tile press-fitting step (FIG. 8A).
FIG. 8B is a sectional view taken along line CC of FIG. 8 (FIG. 8B).

FIG. 9 is a longitudinal sectional view of a mold and a reinforcing bar showing details of a reinforcing bar process.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 PC panel 1 2 Panel structure 3 Surface mortar 4 Exterior surface 5 Structural reinforcing bar 6 Reflective streaks 7 Convex section 8 Depressed groove part 8a Slope 8b Bore 9 Joint surface 10 Ferrite tile 11 Peripheral surface 12 Seating surface 13 Adhesive surface 16 Bolt Insertion hole 20 Metal bolt 30 Anchor member 40 Insert 41 Hook type anchor member 50 Upper die 70 Formwork 55 Holder 60 Band M Fiber reinforced mortar layer C Lightweight concrete

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2E001 DH01 FA09 GA01 GA06 GA17 GA32 GA77 HA01 HA07 HA20 HB03 LA01 LA09 LA11 LA13 LA15 2E162 AA01 CA00 CA01 CA15 CB16 4F100 AA23B AE01A AE01C AE07A AE07C BA03 BA06 BA10A BAD JL02 4G058 GA01 GC01 GD11 GE11 GE14 5E321 AA44 BB22 BB24 BB25 BB34 BB53 CC16 CC22 GG05 GG07 GG11

Claims (13)

[Claims] 1. A radio wave absorbing panel in which a molding material made of concrete or mortar is poured into a mold in two stages, and a radio wave absorbing material is interposed between a first layer molding material and a second layer molding material. In the method of manufacturing a PC panel, the radio wave absorbing material is positioned on a holding portion of an upper die capable of holding the radio wave absorbing material and temporarily fixed to the holding portion, and the first layer is formed on a lower die capable of forming the PC panel. Casting a molding material, lowering the upper mold onto the first layer molding material to a position where the radio wave absorbing material is at least partially embedded in the uncured first layer molding material, Into the first molding material at least partially, and after the first layer molding material is dried and hardened until at least the radio wave absorbing material can be restrained, the upper mold is raised, and the radio wave absorbing material is put into the first layer. Leave it in the molding material, and then make the first layer molding material Method for producing a PC panel, characterized in that the second layer forming material pouring in. 2. The holding portion of the upper mold has a holding member capable of temporarily holding the radio wave absorbing material, and the holding member constitutes a pressing die for forming an uneven surface on an upper surface of the first layer molding material. The method according to claim 1, wherein 3. An upper surface of the radio wave absorbing material press-fitted into the first layer molding material is exposed to a bottom surface of the concave portion of the concave and convex surface, and forms an adhesion surface that adheres to the second layer molding material. The method for manufacturing a PC panel according to claim 2. 4. The method for manufacturing a PC panel according to claim 2, wherein the holding tool includes a bulging member for forming a plurality of bores in a side wall surface of the concave portion of the concave and convex surface. 5. A predetermined curing time is secured after embedding the radio wave absorbing material, and the curing time is set to a drying and curing time at which the first layer molding material can exhibit a predetermined strength. The PC according to any one of claims 1 to 4, wherein the first layer molding material has a radio wave absorbing material binding force set to a strength that overcomes the radio wave absorbing material holding force of the holding portion. Panel manufacturing method. 6. The method for manufacturing a PC panel according to claim 1, wherein the outer edge band of the radio wave absorber has a tapered surface expanding in the first layer molding material. . 7. The PC according to claim 1, wherein the radio wave absorbing material is temporarily adhered to the upper mold radio wave absorbing material holding portion by an adhesive means so as to be separable. Panel manufacturing method. 8. A lower portion of the metal anchor member is provided with the first anchor member.
The anchor member is embedded in a molding material,
The method of manufacturing a PC panel according to claim 1, wherein the PC panel is embedded in a molding material. 9. The method according to claim 1, wherein fiber reinforced mortar is used as the first layer molding material, and lightweight concrete is used as the second layer molding material. The method for manufacturing a PC panel according to the above. 10. A method of manufacturing a radio wave absorbing PC panel using a mold frame capable of placing a molding material made of concrete or mortar in two steps and an upper mold capable of raising and lowering, comprising: An upper mold preparation step of temporarily fixing the upper mold to the predetermined position, a first layer molding material casting step of casting a first layer molding material into the mold, and lowering the upper mold. An upper mold lowering / press-fitting step of at least partially press-fitting the radio wave absorbing material onto the uncured first layer forming material; and the first layer forming material is dried and hardened to a strength capable of capturing the radio wave absorbing material. Thereafter, the upper mold is raised and the upper mold is lifted / released to separate the upper mold from the radio wave absorbing material; and a reinforcing arrangement step of arranging a structural reinforcing bar and / or a reflective bar in the formwork; Casting a second layer molding material into the mold. A method for manufacturing a radio wave absorbing PC panel, comprising: 11. The curing period for a predetermined time is equal to the upper type descent /
Secured between the press-fitting step and the upper mold lifting / releasing step,
11. The first layer molding material is dried and hardened during the curing period, and develops a strength capable of restraining the radio wave absorber to the first layer molding material against the rise of the upper mold. 3. The method for manufacturing a radio wave absorbing PC panel according to 1. 12. The radio wave absorbing PC according to claim 11, wherein a metal anchor member and / or an insert of the anchor member is press-fitted into the first layer molding material in the upper mold lowering / press-fitting step. Panel manufacturing method. 13. The upper mold is oriented in a reverse posture with the holding portion capable of temporarily fixing the radio wave absorbing material facing upward in the upper mold preparing step, and the holding is performed in the upper mold lowering / press-fitting step. The method of manufacturing a radio wave absorbing PC panel according to any one of claims 10 to 12, wherein the panel is oriented in a press-fitting posture in which a portion faces downward.