JP4864451B2 - Trace hole stopper - Google Patents

Description

  The present invention relates to a trace hole processing plug for filling a substantially frustoconical trace hole by a mold support or the like left on a concrete placing surface after removing a mold.

  In general, a concrete structure is constructed by, for example, screwing a substantially frustoconical formwork support, which is also referred to as Con (registered trademark) or cone, to both ends of a separator, and the large diameter side of these formwork supports. The end surface of the mold is brought into contact with and opposed to the inner surface of the mold, and a mold fitting is fixed by screwing a fastening bracket such as Foam Tie (registered trademark) onto the screw shaft of the mold support protruding from the outer surface of the mold After fixing in an upright state at intervals, concrete is placed between these molds. And after concrete hardens | cures, a formwork is removed, In that case, the formwork support tool couple | bonded with the edge part of the separator is also removed. As a result, a large number of substantially frustoconical trace holes remain on the concrete wall surface at regular intervals. In addition, when constructing structures such as piers made of reinforced concrete, when inserting inserts and anchors for mounting scaffolds and supporters in concrete, the same formwork support for the purpose of ensuring a predetermined cover thickness Are used (see Japanese Patent Application Laid-Open No. 2001-214534), and these trace holes left after the completion of the work are subjected to a hole filling process by an appropriate method from the viewpoint of waterproofing and aesthetics. Specifically, the trace hole on the concrete wall is filled with uncured mortar, or a trace hole treatment plug formed by forming a synthetic resin, mortar, ceramics, etc. in a substantially truncated cone shape is inserted, A method of fixing to a concrete wall surface by various fixing means suitable for molding processability of materials such as adhesion, adhesion, and screwing is generally performed.

As a conventional example of a trace hole processing plug classified as an adhesive type, an adhesive is filled in a recess opening on the small diameter side end surface of the treatment plug main body immediately before insertion, and the separator is pushed into the trace hole where the end of the separator protrudes. Yes (Patent Document 1). In addition, an adhesive is previously sealed in the recess of the treatment plug body, and when pushed into the trace hole, the seal material is pierced by the end of the separator protruding from the bottom of the trace hole, and the internal adhesive is put into the trace hole. What is made to flow out is also known (patent documents 2 and 3).
Utility Model Registration No. 3065958 Japanese Utility Model Publication No. 6-76538 Utility Model Registration No. 3084256

  The trace hole processing plug described in Patent Document 1 has a problem that workability is poor because the concave part of the treatment plug main body must be individually filled each time the trace hole is closed. On the other hand, the ones described in Patent Documents 2 and 3 have a structure in which a pre-encapsulated adhesive is combined with the treatment plug itself, which is excellent in terms of workability. Have some problems. First, in the trace hole processing plug described in Patent Document 2, there is a possibility that the processing plug pushed into the trace hole is pushed back a little before the adhesive is cured. As a result, a gap is likely to be generated in the fitting portion, and the reliability is insufficient in terms of the water stop effect. Furthermore, in consideration of productivity, that is, manufacturing cost, synthetic resin that can be injection-molded is more advantageous than mortar and ceramics as a material for the processing plug body, but polyethylene and polypropylene that are widely used in general. In the case of forming with a synthetic resin having a small friction coefficient, such as, it is difficult for the paint to adhere to the end surface on the large diameter side which becomes the exposed surface, and sufficient bonding strength to the trace hole cannot be obtained. Moreover, there has been an essential problem that the synthetic resin itself is inferior in weather resistance compared to inorganic materials such as mortar. Moreover, the thing of patent document 3 is temporarily fixed even if the adhesive is uncured by the check piece of the synthetic resin fixing holder embedded in the inside of the cement main body, and positioning with respect to the trace hole is possible. Although the structure is made, if the main body and the fixing holder are made of different materials, the production takes time and must be expensive.

  The present invention has been made in view of these problems of the prior art, and provides a trace hole treatment plug that is excellent in wearability and that can be economically manufactured while maintaining the weather resistance and the bonding strength to the trace hole. For that purpose.

In order to achieve the above object, in the present invention, a substantially frustoconical concrete that is coupled to a screw member having a female thread portion embedded in concrete and removed from the surface of the cast concrete in conjunction with the demolding of the formwork. It is a trace hole processing plug that can ensure a predetermined cover thickness to be inserted into the trace hole by the mold support, and is provided with a substantially truncated cone-shaped plug body and an end face on the insertion direction side with the same axial center , and the female screw portion of the screw member and screwable male screw-like part exposed inside the mark hole adopts the technical means that are integrally molded by mortar composition comprising a short fiber. Et al is, the insertion direction of the plug body end surface of the opposite side, that the pouring concrete surface can be as a rotation operating unit for mounting in Atoana, provided engaging portion of the tool. Moreover, as a short fiber mix | blended with a mortar composition, synthetic resin fiber is suitable.

The trace hole treatment plug of the present invention consists of a mortar composition that is excellent in weather resistance and nonflammability as a whole, but by blending appropriate short fibers in the composition, it improves the defects of the mortar that is easily chipped as it is, Crack resistance and toughness can be improved. For this reason, it becomes possible to integrally form a screw-like part in a part of the plug body without difficulty, and a fixing means that does not require a separate metal screw member can be obtained. That is , since the male screw-like portion having the same axial center as that of the plug body protrudes from the end surface on the small diameter side of the plug body located on the insertion direction side of the trace hole , for example , the insert exposed on the bottom surface of the trace hole against such a female threaded portion, lever which adjust screw the male threaded portion, it is possible to easily and reliably fix. For this reason, the trace hole is filled with a molded product made of the mortar composition, and no metal material is present inside the trace hole. Therefore, the surface of the cast concrete is filled easily and reliably while ensuring a predetermined cover thickness. Processing can be performed.

The trace hole treatment plug according to the present invention is made of a mortar composition containing short fibers. The short fibers can be applied to the present invention, the synthetic resin fibers, carbon fibers, etc. glass textiles and the like, the fiber length of about 6-8 mm, the amount is in a weight ratio to the whole mortar 0.1 to 0 .3% is preferred. Synthetic resin fibers represented by polyethylene, polypropylene, and polyvinyl alcohol are superior to other short fibers in terms of economy and moldability, and among them, polyvinyl alcohol-based short fibers are preferable because of their affinity with mortar. is there. These short fibers are not limited to one type, and a plurality of types having different dimensions and materials can be used in combination.

Examples of the cement include ordinary Portland cement, early-strength Portland cement, medium-heated Portland cement, various portland cements such as low heat Portland cement, blast furnace cement, fly ash cement, and the like, but are not particularly limited. For the purpose of improving the compression strength of the molded product, silica fume, silica dust, blast furnace slag, silica sol, and fine powder of precipitated silica can be blended. The amount of silica fume is preferably 5 to 20 parts by mass with respect to 100 parts by mass of cement in consideration of the effect and cost. Furthermore, the addition of various water reducing agents is also effective. Examples of water reducing agents include lignin-based, naphthalene sulfonic acid-based, melamine-based, polycarboxylic acid-based water reducing agents, and AE agents. In addition, a lime-based or calcium sulfoaluminate-based swelling agent may be added for the purpose of reducing shrinkage.

Since the trace hole treatment plug according to the present invention includes a screw-like part as a fixing means, basically, it may be attached as it is to the trace hole where the female screw part such as an insert is exposed on the bottom surface . In particular, when waterproofness is required, an appropriate sealing agent or adhesive may be applied to the outer peripheral surface of the stopper main body for mounting. Further, such Atoana processing plug is not limited to the filling process such Inserts as described above, in the step of fabricating a T-shaped girder of the precast concrete bridge, a vent-up (post) required tension PC steel wire The present invention can also be applied to other uses, such as trace hole processing of a mold support used for fixing to a mold. Hereinafter, examples of the present invention will be described with reference to the drawings. However, the present invention is not limited to the examples, and various modifications within the technical concept of the present invention, such as a blending ratio of the mortar composition and a change in the overall shape, are described. Of course, changes can be made.

1 and 2 are a partially longitudinal front view and a left side view, respectively, showing a first embodiment of a trace hole processing plug according to the present invention. The illustrated trace hole processing plug 1 is made of a mortar composition containing short fibers, and the male screw-like portion 3 is integrated with the plug main body 2 on the small diameter side end surface of the substantially truncated cone-shaped plug main body 2 on substantially the same axis. Is provided. Further, one circular concave portion 4 is provided on the large-diameter side end face of the plug body 2 at opposing positions sandwiching the axis. By the way, an example (mass ratio) of the composition constituting them is as follows: cement (ordinary Portland cement) 19.3%, water 8.1%, fine aggregate (No. 6 silica sand) 67.9%, silica fume 3.7%, short fiber (polypropylene: fiber length 6 mm) 0.25% and admixture (AE water reducing agent) 0.65%. In this case, a design strength of 60 N / mm ² is obtained.

  Next, the usage method of the said trace hole processing stopper 1 is demonstrated, referring FIG. 3 thru | or FIG. FIG. 3 shows a method of attaching the bracket 6 for installing a support (not shown) to the pier 5 made of reinforced concrete, for example, in construction of a viaduct. In other words, an iron mold support 7 and an insert 8 made of deformed reinforcing bars are embedded in the bridge pier 5 in advance, and are fixed by bolts 9 penetrating the bracket 6. As shown in FIGS. 4 and 5, the mold support 7 is set to have the same external dimensions as the trace hole processing plug 1, but the female thread portion that is screwed to the bolt 9 on the end face on the large diameter side. 10 is opened, and an annular recess 11 is provided around the open end side portion of the female screw portion 10, and the inside of the annular recess 11 is formed as a hexagonal nut-like portion 12. The hexagonal nut-shaped portion 12 is used to engage a box wrench when removing the formwork support 7. Further, a male screw portion 13 that is screwed with the female screw portion 14 of the insert 8 is provided on the end surface on the small diameter side. In order to cut off the adhesion between the mold support 7 and the concrete for easy removal, it is convenient to apply an appropriate paint to the outer peripheral surface in advance or to coat a thin synthetic resin tube.

FIG. 6 shows a state where the bracket 6 and the formwork support 7 are removed, and a frustum-shaped trace hole 15 is exposed on the surface of the pier 5. Then, as shown in FIG. 7, the trace hole processing plug 1 is inserted into the trace hole 15, and the male screw portion 3 is screwed into the female screw portion 14 of the insert 8. At this time, an appropriate tool can be fitted into the two recessed portions 4 provided on the end surface on the large diameter side to be surely inserted and fixed to a predetermined position. In addition, waterproofness can be further improved if an appropriate sealing agent or adhesive is used together as necessary.

In Atoana processing plug above you施例, but a recess 4 for engagement with a tool when screwing the Atoana is provided on the large diameter side end face, for example, polygonal peripheral surface in place of the recess It is good also as a convex part. In this case, since the convex portion becomes unnecessary after being screwed into the trace hole, it is desirable that the portion protruding from the concrete surface be formed so that it can be easily broken. In addition, these recessed parts or convex parts are not essential in the trace hole processing plug of the present invention, and can be rotated using an appropriate rubber sucker as long as the end face on the large diameter side is a flat surface.

It is a partial vertical front view which shows 1st Example of the trace hole processing stopper by this invention. It is a left view of the trace hole processing stopper shown in FIG. It is explanatory drawing which shows the use condition of the insert and formwork support tool with which the trace hole processing stopper of 1st Example is applied. It is a partial longitudinal front view of the formwork support shown in FIG. It is a left view of the formwork support shown in FIG. It is explanatory drawing which shows the state which removed the formwork support etc. from the state of FIG. Ru explanatory view showing a use state of Atoana processing plug of the first embodiment.

DESCRIPTION OF SYMBOLS 1 ... Trace hole processing plug, 2 ... Plug main body, 3 ... Male screw-shaped part, 4 ... Recessed part, 5 ... Placing concrete, 6 ... Bracket, 7 ... Formwork support, 8 ... Insert, 9 ... Bolt, 12 ... Hex nut-shaped part, 15 ... Trace hole

Claims (3)

Predetermined to be inserted linked to the screw member having a female screw portion which is embedded in the concrete, after the hole by a substantially frustoconical concrete form bearing member to be removed from the pouring concrete surface in accordance with the demolding of the mold This is a trace hole processing plug capable of securing a cover thickness , which is a substantially truncated cone-shaped plug main body, and the screw member protruding from the end surface on the insertion direction side with the same axis and exposed to the inside of the trace hole A trace hole processing plug, wherein the female screw portion and the male screw-like portion that can be screwed together are integrally formed of a mortar composition containing short fibers . The trace hole processing plug according to claim 1, wherein the plug body includes a tool hooking portion on an end surface on the side opposite to the insertion direction . The trace hole processing plug according to claim 1 , wherein the short fibers are synthetic resin fibers .