JPH0699423A - Manufacture of composite component - Google Patents

Abstract

PURPOSE:To recover components required for holding temporarily after pouring concrete so as not to disclose the end faces of iron bars on the surface of a composite material at all by supporting a foamed material on its both sides and holding the material temporarily in a mold. CONSTITUTION:Reinforcing components 50 running through a foamed material 20 in the horizontal direction and with connecting sections 52 at both ends and supporting components 60 running through a composite component A, the ends of which are connected with removable connecting sections 52 of the reinforcing components 50, are provided, and the supporting components 60 are set to run through the foamed material from the outside of the mold side wall, and the ends of the supporting components 60 are installed to the connecting sections 50 of the reinforcing components 50 and the foamed material 20 is held temporarily in the floating state in a mold. Concrete is poured in until the foamed material 20 is sunk, and then the ends of the supporting components are removed from the connecting sections 52 of the reinforcing components 50 before or after solidifying the concrete and drawn to the outside of the mold.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a composite member in which a foam material is embedded in concrete and which is used for, for example, a bridge girder.

[0002]

2. Description of the Related Art Conventionally, as a composite member for bridge girders, for example, as shown in "2S19" of "JISA5313", a foam material such as Styrofoam is embedded in concrete, and a PC steel material and a reinforcing bar are pulled around it. There is known a structure in which a composite member is lightened by embedding the composite member in a state of being covered with the foam material.

[0003]

By the way, in the case of manufacturing such a composite member, the foam material is temporarily fixed at a predetermined position in the mold, and then the concrete is poured into the mold. When concrete is poured, a large buoyancy acts on the foam material due to the difference in specific gravity. Therefore, a temporary fixing structure that can withstand the buoyancy and hold the foam material at a predetermined position is required. As a method of temporarily fixing the foam material, a method in which the upper and lower left and right inner walls of the formwork and the foam material are each stretched with a steel bar, the foam material is skewered with a steel bar, and both ends of the steel bar are fixed to the formwork. A method of sandwiching between the left and right inner walls can be considered.

However, according to such a manufacturing method, after molding, the iron rod for temporarily fixing the foam material remains and is buried in the concrete as it is. Then, the end surface of the iron bar that was in contact with the inner wall of the form at the time of temporary fixing appears on the surface of the composite member after molding, so when the composite member is used as a bridge girder, the end surface of the steel bar is immediately corroded and this easily occurs. There is a problem that the strength of the composite member is significantly reduced by proceeding inward.

The present invention has been made paying attention to such a point, and an object thereof is to support the foam material at least laterally in the formwork and temporarily fix it, and to temporarily fix it. The purpose is to make it possible to recover the member after pouring concrete so that the end face of the iron bar does not appear on the surface of the composite member at all.

[0006]

In order to achieve the above object, the method for producing a composite member according to claim 1 is directed to a method for producing a composite member in which a foam material is embedded in concrete.
On the other hand, a reinforcing member that penetrates the foam material in the horizontal direction and has connecting portions at both ends, and a reinforcing member that penetrates the formwork side wall of the composite member and is detachably connected to the connecting portion of the reinforcing member at the tip. With a support member, first penetrate the support member from the outside of the mold side wall, attach the tip of this support member to the connecting portion of the reinforcing member, and temporarily fix the foam material in the mold in a floating state,
Next, after pouring concrete until the foam material is submerged, the tip of the supporting member is detached from the connecting portion of the reinforcing member before or after the concrete is solidified, and is pulled out of the form.

The method for manufacturing the composite member according to claim 2 is
In addition to the above configuration, a pressing device having a pressing rod that holds the foamed material from above and can be retracted upward is installed on the upper part of the formwork to operate the support member before or after solidification of concrete. In addition, the pressing rod is retracted upward.

[0008]

With the above construction, in the inventions of claims 1 and 2, when the foam material is temporarily fixed and the concrete is poured, the foam material, the reinforcing member and the support member are immersed in the concrete. In that case, buoyancy acts on the foam material to try to float, but since it is pressed by the reinforcing member integrated with the support member fixed to the mold, it does not float and is held at a predetermined position.

When the support member is removed from the reinforcing member before or after the solidification of concrete,
Since there is no member for temporarily fixing the foam material, the end of the temporary fixing member does not go out of the composite member after molding. Therefore, there is no cause for corrosion to progress inside the composite member.
In that case, a space remains in the part where the support member is pulled out, but before the solidification of concrete, the surrounding concrete flows in to block the above space, and after the solidification of concrete, by pouring the concrete separately, The space can be closed.

In particular, according to the second aspect of the invention, since the foam material is also pressed by the pressing rod, the buoyancy that the reinforcing member and the supporting member bear is reduced. In that case, since the pressing rod is retracted upward before or after solidification of the concrete, the end portion of the pressing rod does not come out of the composite member after the molding. Therefore, there is no cause for corrosion to progress inside the composite member. Moreover, the space remaining in the part where the presser bar is pulled out can be closed by the surrounding concrete flowing in before the solidification of the concrete, and by pouring the concrete separately after the solidification of the concrete.

[0011]

EXAMPLES Examples of the present invention will be described below. FIG. 2 shows a composite member A for a bridge girder manufactured by the manufacturing method of the first embodiment. This composite member A is "JIS A531".
3) has a structure according to “2S19”. That is, the foam material 20 made of Styrofoam is added to the concrete 10.
Is embedded, and PC steel material 31 and rebar 32 are further provided around it.
It is a structure that is embedded in a state where a pulling force is applied.

As shown in FIG. 1, the manufacturing method of the composite member A is basically a bottom plate 41, four side plates 42 standing on the bottom plate in four directions, and a top plate (not shown). Using the mold 40 provided with, the foam material 20 is temporarily fixed at a predetermined position in the mold, the PC steel material 31 and the reinforcing bar 32 are further stretched, and concrete is poured into the mold.

As a characteristic of the present invention, first, FIG.
Further, as shown in FIG. 3, the reinforcing member 50 is provided so as to penetrate the foam material 20. The reinforcing member 50 is a penetrating portion 51 formed of a reinforcing bar that penetrates the foam material 20 in the horizontal direction and has male threads cut at both ends, and a flanged pipe having female threads cut inward. The connecting portion 52 is screwed to both ends of the connecting portion 51. Reference numeral 60 denotes a support member made of a reinforcing bar, having a male screw at the tip and a flange in the middle, and the tip is fitted into a hole 42a formed in the side plate 42 of the formwork, By being screwed into the connecting portion 52 of the reinforcing member 50, the connecting portion is detachably connected to the connecting portion. The holes 42a are formed at symmetrical positions, and are formed at predetermined intervals in the longitudinal direction of the mold 40. Correspondingly, the reinforcing members 50 are also penetrated through the foam material 20 at a predetermined interval, and the supporting members 60 are screwed from the left and right to the connecting portions 52 at both ends of each reinforcing member 50.

Next, the manufacturing method of the first embodiment will be explained. A frame 40 is assembled, the foam material 20 is supported therein, and a supporting member 60 is fitted into each hole 42a of the side plate 42 to reinforce the reinforcing member. The foam material 20 is temporarily fixed in a floating state by being screwed into the connection portion 52 of the mold 50. Next, foam material 2
After pouring concrete into the formwork 40 until 0 was set and reached the target level, the part of the support member 60 that was outside the formwork was rotated before or after the concrete was solidified to remove the tip from the connecting portion of the reinforcing member. , Pull out of the form to complete the work.

Therefore, according to the manufacturing method of the first embodiment, even if the foam material 20 receives buoyancy in the concrete and tries to float up, the support member 60 fixed to the form 40 is used.
Since it is pressed by the reinforcing member 50 integrated with the above, it does not float and is held at a predetermined position.

When the support member 60 is removed from the reinforcing member 50 before or after the concrete is solidified and then pulled out, there is no temporary fixing member for connecting the foam material 20 and the inner wall of the mold, so that the temporary construction after molding is performed. The end of the stopping member does not go out of the composite member A. Therefore, there is no factor that causes corrosion to proceed inside the composite member, and the decrease in strength of the composite member A can be prevented.

In that case, a space remains in the portion where the support member 60 is removed, but before the concrete is solidified, surrounding concrete flows in to block the space, and after the concrete is solidified, the concrete is separately provided. The space can be closed by pouring.

4 and 5 show a manufacturing method of the second embodiment. The target composite member is the same as that of the first embodiment, and the configurations of the foam material, the mold, the reinforcing member, the supporting member, and the like are basically the same as those of the first embodiment, so that the same members are the same. I will attach a symbol. In the second embodiment, the foam material 2
A holding device 70 that holds 0 is provided. The holding device 70 includes a frame 71 arranged on the mold 40 at predetermined intervals and fixed by bolts 72, and a holding rod 73 formed of a bolt screwed into a screw hole formed in the center of the frame 71. And the pressing rod 73 holds the foam material 20 from above.
3 can be retracted upward by turning. Further, a pressing plate 80 is arranged between the pressing rod 73 and the foam material 20, and as shown in FIG. 5, a step 81 is formed at the tip of the pressing rod 73 in a hole 81 formed in the center thereof. The protrusion 73a is inserted.

As a procedure, in addition to the operation of detaching the support member 60 from the connecting portion 52 and pulling it out of the mold before or after solidification of concrete, the pressing rod 7
Turn 3 to evacuate upwards.

Therefore, according to the manufacturing method of the second embodiment, since the foam material 20 is also pressed by the pressing rod 73 of the pressing device 70, the reinforcing member 50 and the supporting member 6 are provided.
The buoyant force taken by 0 is reduced, and each member 50, 60 can be made thin and lightweight. In that case, since the pressing rod 73 is retracted upward before or after solidification of the concrete, the end portion of the pressing rod 73 does not come out of the composite member A after the molding. Therefore, there is no cause for corrosion to progress inside the composite member. Specifically, even if the method of the first embodiment requires a supporting member 60 to have a diameter of 20 mm, when the method of the second embodiment is adopted, the supporting member 60 can be used.
A diameter of 8 mm is sufficient.

Further, the space remaining in the portion where the pressing rod 73 is removed is closed by the surrounding concrete flowing in before the concrete is solidified, and by pouring the concrete separately after the concrete is solidified. You can However, it can be said from the experimental example that it is difficult to uniformly determine whether to remove the pressing rod 73 before or after solidification of concrete, regardless of the shape of the composite member. This is because the buoyancy acting on the foam material 20 differs depending on the volume and shape of the foam material 20 and the initial fluidity of the concrete changes depending on the composite member, and therefore the force holding the foam material 20 also differs.

In the second embodiment, the pressing rod 73
Although it is provided so as to be able to be retracted upward with respect to the frame 71 in a screwing relationship with a screw, it may be possible to have a gear meshing relationship and other configurations. Further, regarding the mounting structure of the pressing device 70, there is a clamp type mounting structure as shown in FIG. 6 in addition to the structure of fixing to the side plate 42 by the mounting bolt 72 as described above. That is, the clamp 75 opened downward is integrally provided on the leg portion of the frame 71 ′, the side plate 42 is sandwiched by the clamp 75, and the holding device 70 is attached by fixing with the fixing bolt 75a. . Regarding how to use it, first attach the holding rod 73 to the frame 71 ', and then press the holding rod 7
3 is applied to a predetermined position of the foam material 20 in advance via the pressing plate 80, and the pressing device 70 is set on the frame 40. According to the mounting structure of the holding device, the side plate 4
There is an advantage that the space between the pressing devices can be easily adjusted irrespective of the thickness of 2 and labor can be saved. Further, as a similar mounting structure, there is a mounting structure in which a U-shaped clip for sandwiching the side plate 42 by an elastic restoring force is integrally provided on the leg portion of the frame 71 ′, instead of the clamp 75 (not shown). .

In each of the above-mentioned embodiments, the reinforcing member and the supporting member do not have to be mainly made of reinforcing bars as described above, and may be made of plastic or wood, for example. Further, although the reinforcing member 50 is provided in the lateral direction of the foam material 20, it may be provided in the longitudinal direction. Further, although the reinforcing member 50 is composed of the two members of the penetrating portion 51 and the connecting portion 52, it may be integrally formed. Further, the connection between the reinforcing member 50 and the supporting member 60 is configured by the connecting relation of the male screw and the female screw, but the point is that the supporting member is detachably connected to the connecting portion of the reinforcing member at its tip. Good. Therefore, they may be joined by a fitting relationship without screws, for example, serrations. Also, for example, the tip of the supporting member is adhered to the connecting portion of the reinforcing member with a strength such that it can be peeled off by twisting, before solidification of concrete. Alternatively, it may be twisted to separate it and then withdraw it. Further, the foam material is not limited to that made of expanded polystyrene.

[0024]

As described above, in the method of manufacturing the composite member according to the first and second aspects, first, the supporting member is penetrated from the outside of the side wall of the mold, and the tip of the supporting member is attached to the connecting portion of the reinforcing member. The foam material is temporarily fixed in the mold in a floating state, and then concrete is poured until the foam material is submerged, and the tip of the supporting member is removed from the connecting portion of the reinforcing member before or after the concrete is solidified. Since it is configured to be pulled out of the mold, it is possible to hold the foam material from rising due to buoyancy and hold it in a certain position securely, and the temporary fixing member does not go out of the composite member after molding, It is possible to reliably prevent the progress of corrosion to the composite member, and prevent the strength of the composite member from decreasing.

Further, in the method of manufacturing the composite member according to the second aspect, since the foam material is also pressed by the pressing rod of the pressing device,
The buoyant force carried by the reinforcing member and the supporting member is reduced, and each member can be made thin and lightweight. Even in that case, the end portion of the pressing rod does not go out of the composite member after the molding, the corrosion can be surely prevented from progressing inside the composite member, and the strength reduction of the composite member can be prevented.

[Brief description of drawings]

FIG. 1 shows a state before pouring concrete, in which a front side plate is removed and a right side plate is partially cut away.
A perspective view of the embodiment,

FIG. 2 is a vertical sectional side view of the composite member of the first embodiment,

3 is a front view of the main part in the state of FIG. 1,

FIG. 4 is a view corresponding to FIG. 1 in the second embodiment,

5 is a vertical side view of the main part of FIG.

FIG. 6 is a front view showing a modified example of the frame fixing structure.

[Explanation of symbols]

 A Composite member 10 Concrete 20 Foam material 40 Form frame 50 Reinforcing member 52 Communication part 60 Supporting member 70 Holding device 73 Holding bar

Claims (2)

[Claims] 1. A method of manufacturing a composite member in which a foam material is embedded in concrete, comprising: a reinforcing member penetrating the foam material in a horizontal direction and having connecting portions at both ends; and a formwork side wall of the composite member. And a supporting member that is detachably connected to the connecting portion of the reinforcing member at the tip, first penetrates the supporting member from the outside of the mold side wall, and attaches the tip of the supporting member to the connecting portion of the reinforcing member. The foam material is temporarily fixed in the mold in a floating state, and then concrete is poured until the foam material is submerged, and the tip of the supporting member is removed from the connecting portion of the reinforcing member before or after the concrete is solidified. And a method for manufacturing a composite member, which comprises pulling the composite member out of the form. 2. A pressing device having a pressing rod that presses the foamed material from above and can be retracted upward is installed on the upper part of the mold, and in addition to the operation of the support member before or after solidification of concrete, the above-mentioned operation is performed. The method for manufacturing a composite member according to claim 1, wherein an operation of retracting the pressing rod upward is performed.