JP2007130879A - Lime wash preventing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lime wash preventing device which prevents the leakage of the lime wash of concrete to the outside of a cast concrete form, ensures the easiness of the finish work of a concrete surface by an iron, contributes to the reduction of industrial waste, dispenses with the attaching and detaching work of a side form without detaching the side form from a bed and largely contributes to the enhancement of productivity. <P>SOLUTION: The lime wash preventing device, wherein an upward opened reinforcement insertion hole 5 is formed to a side form 3 and a plurality of reinforcements 6, 6a are inserted vertically in the reinforcement insertion hole 5 to close the gap of the reinforcement insertion hole 5 produced to a part other than the inserted reinforcements 6, 6a comprises: the flexible main body part 9 for covering the reinforcement insertion hole 5; a plurality of reinforcement insertion holes 9a and 9b arranged to the flexible main body part 9 up and down; the cutting lines 9d and 9f for inserting the reinforcements 6, 6a in the reinforcement insertion holes 9a and 9b from the outer end of the main body part 9; and a holding means for holding the main body part 9 to the reinforcement insertion hole part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a slot stop for a precast concrete mold.

  Conventionally, as a method for producing a precast concrete (hereinafter also referred to as PC) slab, as shown in FIG. 4, a steel side mold 102 is fixed on a steel bed (surface plate) 101 with bolts or knock pins. Standing fixedly with the dressing device 103, forming a mold, placing a metal fitting and a reinforcing bar in the mold, and then placing the ready-mixed concrete, curing and hardening the concrete, A general method is to take out the hardened precast concrete floor slab 104 as a product after removing the side mold.

  Moreover, in order to couple | bond with the floor slab etc. which adjoins to the PC floor slab, the reinforcing bar (joint reinforcement) which protrudes from the side end surface of a floor slab is embedded. The protruding reinforcing bars may be one of the upper reinforcing bars 105 shown in FIGS. 4 and 5 or two of the upper and lower reinforcing bars 105 and 106. In the case of one, by leaving a single reinforcing bar insertion hole for inserting the reinforcing bar 105 in the mold 102, the mold can be removed by shifting in the protruding direction of the reinforcing bar at the time of demolding. However, as shown in FIGS. 4 and 5, in the case of a U-shaped reinforcing bar in which two reinforcing bars 105 and 106 protrude and the protruding ends are connected, it cannot be removed by a single hole. A concave (groove-shaped) reinforcing bar insertion hole 107 having an upper end is formed in the upper part of the steel sheet. When the reinforcing bar is set, the reinforcing bars 105 and 106 are dropped into the reinforcing bar insertion hole 107 from above the formwork, and the floor slab is moved upward when removing the mold. It can be removed by lifting it up.

  Further, when the U-shaped reinforcing bars (joint bars) as described above are also in one place, the PC floor slab cannot be moved upward and demolded unless all the reinforcing bar insertion holes are formed in a concave shape as described above. .

  However, when the reinforcing bar insertion hole is formed in a concave shape as described above, the reinforcing bar insertion hole 107 in the upper part of the dropped reinforcing bar becomes vacant inward and outward, and from this gap, the concrete that has not yet solidified Noro leaks out of the formwork, making it difficult to clean the side formwork and adversely affecting productivity.

  Therefore, as a method of closing the gap, as shown in FIGS. 4 and 5, a U-shaped clip-shaped noro stopper is provided so as to cover the gap from the reinforcing bar 105 to the upper end surface 102 a of the side mold 102. 108 is fitted from the upper side of the side mold 102, and the adhesive tape 109 is attached to the inner surface of the side mold in a space between the upper and lower reinforcing bars 105, 106, thereby preventing leakage of the concrete. Can be considered. Further, an adhesive tape may be applied instead of the clip-shaped slot stop 108.

  However, if a method of fitting the U-shaped clip-shaped noro stopper 108 from above the side mold as in the conventional case is adopted, the upper side 108a of the noro stopper 108 is placed on the upper surface 102a of the side mold 102. When the thickness of the wall sticks out and the surface of the concrete placed by the plasterer is pressed with a trowel, the trowel hits the upper side 108a of the above-mentioned noro stopper 108, which obstructs the trowel presser.

  Further, in the method of applying the adhesive tape 109, since the adhesive tape 109 cannot be peeled off before demolding, the rebar 106 hits the adhesive tape 109 when demolding upward of the PC floor slab, and demolding In addition, it is difficult to reuse the used adhesive tape 109, which causes a large amount of industrial waste.

  Furthermore, there is also a problem that the gutter leaks out from the gap between the lower end of the gutter stopper 108 and the adhesive tape 109 and adheres to the outer surface of the side mold 102, making it difficult to clean the side mold 102.

  Then, this invention aims at providing the slot stop in the precast concrete formwork which solves the said subject.

  In order to solve the above-mentioned problem, the invention according to claim 1 is to form a reinforcing bar insertion hole whose upper side is opened in the side mold, and to insert a plurality of reinforcing bars into the reinforcing bar insertion hole. A concrete slot stopper for closing a gap of a reinforcing bar insertion hole generated in a part other than the inserted reinforcing bar, and a flexible main part covering the reinforcing bar insertion hole, and a plurality of upper and lower parts arranged on the main part. Each reinforcing bar insertion hole, a cutting line for inserting the reinforcing bar from the outer end of the main part to the reinforcing bar insertion hole, and holding means for holding the main part in the reinforcing bar insertion hole. .

  The invention according to claim 2 is the invention according to claim 1, wherein the two reinforcing bar insertion holes are provided vertically, and the cutting line extends from the upper reinforcing bar insertion hole to the upper end of the main portion and the lower reinforcing bar insertion hole. It is provided over the lower end of the main body.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the holding means is provided on one side of the main body with a locking portion that fits and locks into the reinforcing bar insertion hole of the side mold. It is characterized by being formed.

  According to the present invention, even when a plurality of reinforcing bars are inserted into the reinforcing bar insertion holes of the side mold, the reinforcing bars can be easily inserted into the reinforcing bar insertion holes by the cutting line. By holding the reinforcing bar insertion hole portion, the reinforcing bar insertion hole is blocked, and it is possible to prevent leakage of concrete from the formwork and to facilitate the cleaning work of the formwork.

  In addition, when the concrete is removed from the mold, the slot stop does not hinder the removal, and the side mold is not removed from the bed, and the assembly and removal of the side mold is not required, which can greatly contribute to the improvement of productivity.

  Moreover, it can mount | wear so that the upper end of a slot stop may not protrude from the upper end of a side formwork, and when pressing the surface of ready-mixed concrete with a trowel, a slot stop does not become trouble.

  In addition, noro-stoppers can be reused, and by forming them with recyclable materials such as rubber, rubber can be recycled even if it becomes damaged and cannot be used. There is no thing to put out.

  Furthermore, since the noro stopper of the present invention can be mounted from the outside of the side mold, the noro stopper can be removed before demolding the concrete plate. Therefore, the stopper can be easily removed when the concrete is semi-cured.

  Furthermore, before removing the concrete slab, the slot stopper is removed from the side formwork to remove the slot stop at the place where the formwork is installed. It is not moved to the storage place as it is, and it is possible to eliminate the trouble of collecting it after removing it from the storage place and transporting it to the mold.

  BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out the present invention will be described based on an embodiment shown in the drawings.

  1 and 2 show Embodiment 1 of the present invention, and show an embodiment in which two reinforcing bars are used as joint bars.

  As shown in FIG. 1, a mold 1 is a steel side mold 3 around a steel bed (surface plate) 2 installed on the ground surface, and a detachable fastener 4 such as a bolt or a knock pin. It is formed upright.

  In addition, as shown in FIG. 2, the side mold frame 3 is located in a portion where a reinforcing bar which is a joint bar is disposed, and has a concave (groove shape) reinforcing bar from the upper surface 3 a of the side mold frame 3 downward. An insertion hole 5 is formed. The bottom surface 5a of the reinforcing bar insertion hole 5 is formed in a semicircular shape having substantially the same diameter as the radius of the reinforcing bar (joint bar) 6 to be inserted, and both inner end surfaces 5b and 5c have an opening width from the bottom surface 5a. It is formed in a tapered surface that expands slightly as it goes upward, and its upper end is opened to form an insertion port 5d. The shape of the reinforcing bar insertion hole 5 such as depth and width is set according to the position and shape of the reinforcing bar 6.

  As shown in FIG. 1, reinforcing bars 6 and 6 a protruding from the lateral end surface of the PC floor slab 7 are inserted into the reinforcing bar insertion holes 5. The protruding portions of the two reinforcing bars 6 and 6a are connected in a U shape.

  Reinforcing bars 6 and 6a, which are joint bars, drop from above and are inserted into the reinforcing bar insertion hole 5 as shown in FIG. , 6a, a gap is generated in the reinforcing bar insertion hole 5, and the concrete slot placed from the gap leaks out. Therefore, the slot stopper 8 is set in the gap.

The slot stop 8 will be described in detail.
As shown in FIG. 2, the slot stop 8 is formed of a flexible elastic material such as rubber or resin, and a main body 9 that closes the gap of the reinforcing bar insertion hole 5, and one side of the main body 9. The upper fitting part 10 and the lower fitting part 11 are formed.

  The main body 9 is formed in a rectangular plate shape having a larger area than the reinforcing bar insertion hole 5. The main body 9 has an upper rebar insertion hole 9 a and a lower rebar insertion hole 9 b. On the axis line in the vertical direction passing through the center, each is spaced with a predetermined interval (the interval between the upper and lower reinforcing bars 6, 6a).

  Above the upper reinforcing bar insertion hole 9a, an upper piece 9c that closes the gap from the upper reinforcing bar 6 to the upper end of the reinforcing bar insertion hole 5 in the reinforcing bar insertion hole 5 is configured, and the upper piece 9c includes the upper reinforcing bar 9c. An upper cutting line (a notch penetrating through the front and back) 9d connecting the upper end of the insertion hole 9a to the upper end of the main body 9 is formed. With the upper cutting line 9d, the upper piece 9c can be separated from the center to the left and right. Further, the cutting line 9d portion is in close contact with the normal time.

  Below the lower reinforcing bar insertion hole 9b, a lower piece 9e that closes a gap from the lower reinforcing bar 6a to the lower end of the reinforcing bar insertion hole 5 in the reinforcing bar insertion hole 5 is configured, and the lower reinforcing bar 6a is closed downward. Also in the lower piece portion 9e, a lower cutting line 9f that connects the lower end of the lower reinforcing bar insertion hole 9b to the lower end of the main portion 9 is formed. Thereby, the lower piece portion 9e can be separated from the center to the left and right. In addition, the cutting line 9f portion is in close contact with the normal time.

The upper piece 9c and the lower piece 9e also have a closed portion.
Further, upper fitting portions 10 and 10 as holding means are respectively formed on both surfaces of the upper piece portions 9c and 9c divided into two by the upper cutting line 9d.

  The upper fitting parts 10, 10 are spaced from the base parts 10 a, 10 a having a projection length corresponding to the thickness of the side mold 3 and the front parts of the base parts 10 a, 10 a so as to be separated in the left-right direction in the state in which the noro stopper 8 is mounted. It is comprised from the hook-shaped latching | locking parts 10b and 10b which protruded right and left from these, and these have elasticity in the left-right direction.

  The upper fitting portions 10 and 10 are formed with a predetermined length from the upper end of the main body portion 9 to the lower portion, and the outer side surfaces 10c and 10c of the base portions 10a and 10a and the locking portions 10b and 10b A fitting groove for fitting to both inner end faces 5b, 5c of the reinforcing bar insertion hole 5 is formed, and the upper cutting line 9d is formed to be positioned at the center of both of the upper fitting portions 10, 10. ing.

  Furthermore, lower fitting parts 11, 11 project from one side located between the upper reinforcing bar insertion hole 9a and the lower reinforcing bar insertion hole 9b, that is, on the side where the upper fitting parts 10, 10 are provided. Yes.

  The lower fitting parts 11 and 11 are formed in the same shape as the upper fitting parts 10 and 10 by the base parts 11a and 11a and the locking parts 11b and 11b, and have the same vertical direction as the upper fitting parts 10 and 10. It is located on the axis and has a length extending from the lower end of the upper reinforcing bar insertion hole 9a to the upper end of the lower reinforcing bar insertion hole 9b.

Next, the process and operation of manufacturing a PC floor slab using the slot stop 8 will be described.
As shown in FIG. 1, a side mold 3 is fixed on a bed 2 with a fastening tool 4 such as a bolt or a knock pin, and a leading metal fitting or reinforcing bars 6 and 6 a are installed in a molding space of a PC floor slab 7. The upper and lower two reinforcing bars 6, 6 a are inserted so as to drop into the reinforcing bar insertion hole 5 so as to protrude to the outside of the side mold 3. The lower reinforcing bar 6 a contacts the bottom surface 5 a of the reinforcing bar insertion hole 5, and the upper reinforcing bar 6 is positioned in the middle region of the reinforcing bar insertion hole 5.

Next, the slot stopper 8 is attached to the reinforcing bar insertion hole 5 from the inside of the side mold 3.
As shown in FIG. 2, the upper fitting portion 10 and the lower fitting portion 11 are directed toward the side mold frame 3 inside the side mold frame 3. Then, the upper pieces 9c, 9c divided in the left and right directions are shifted in the opposite direction due to the elasticity of the rubber, the upper cutting line 9d is opened, the upper rebar 6 is inserted into the upper rebar insertion hole 9b, and the lower Similarly, the lower portions 6e are inserted into the lower reinforcing bar insertion holes 9b.

  Thereafter, the surface of the main body 9 is pressed toward the side mold 3 from the inside of the mold 1. At this time, since the upper cutting line 9d and the lower cutting line 9f are formed, it is possible to loosen the tightening of the upper reinforcing bar insertion hole 9b, and even if the reinforcing bar 6 is a deformed reinforcing bar, the axial direction of the reinforcing bar 6 Can be shifted.

  The upper fitting portion 10 and the lower fitting portion 11 are inserted into the reinforcing bar insertion hole 5 while being bent inside the reinforcing bar insertion hole 5, and the locking portions 10 b, 10 b, 11 b, and 11 b are outside the side mold frame 3. When it reaches, it expands by its elastic restoring force, and is caught on the outer surface of the side mold 3, and the slot stop 8 is fitted and attached to the rebar insertion hole 5 part. Further, since the upper fitting portion 10 and the lower fitting portion 11 are arranged in the space where the reinforcing bars 6 and 6 a are not positioned in the vertical direction of the reinforcing bar insertion hole 5, the upper fitting portion 10 is inserted when the slot stopper 8 is inserted. And when the lower fitting part 11 bends inward, it does not abut against the reinforcing bars 6 and 6a. Furthermore, by the fitting engagement of the upper fitting part 10 and the lower fitting part 11, the slot stopper 8 is firmly held by the side mold 3, and the main part 9 connects the reinforcing bar insertion hole 5 to the inside of the side mold 3. Block from. It should be noted that the upper end of the main body 9 and the upper end of the side mold 3 are positioned at the same height when the slot stop 8 is mounted.

  Thereafter, the ready-mixed concrete 12 is placed in the mold 1 and the surface is pressed and leveled. At this time, since the upper end of the side mold 3 and the upper end of the noro stop 8 are located at the same height, the noro stop 8 does not hinder the pressing of the surface of the ready-mixed concrete with the trowel. The finishing work by becomes easy. The concrete is then cured and hardened, and the hardened concrete plate is lifted up by a suitable means and demolded.

  At this time, the slot stop 8 is slidable in the vertical direction with respect to the side mold 3 and is formed of an elastic body made of rubber or the like, so that the side mold 3 may receive a large resistance. There is not, and the stopper 8 is extracted from the insertion port 5d together with the hardened concrete plate and the reinforcing bars 6 and 6a. Further, when removing the noro stopper 8 from the concrete plate after demolding, the main portion 9 is formed in a plate shape and the noro stopper 8 is formed of rubber, so that the noro sticking to the concrete plate is removed. The stopper 8 can be easily removed from the concrete plate by pulling it off in the outer direction of the lateral end surface of the concrete plate and removing it from the reinforcing bars 6 and 6a in the reverse process of the mounting process to the reinforcing bars 6 and 6a. .

  As described above, the slot stopper 8 is a simple operation of fitting into the reinforcing bar insertion hole 5 from the inside of the side mold 3 to close the reinforcing bar insertion hole 5 and leak the concrete slot out of the mold 1. Can be prevented. Furthermore, since the concrete plate can be extracted without resistance from above the formwork 1 without removing the side formwork 3 from the bed 2 at the time of demolding, the assembly and removal work of the side formwork 3 is not required, and the man-hour is greatly increased. It can be reduced and can greatly contribute to the improvement of productivity.

  In addition, the stopper 8 can be used repeatedly, and further, by forming it with a recyclable material such as rubber, the rubber can be recycled even if it becomes damaged and cannot be used. There is no issue.

  Moreover, the upper rebar insertion hole 9a and the lower rebar insertion hole 9b block the rebar insertion hole 5 and prevent leakage of concrete from the formwork 1 to facilitate the work of cleaning the formwork.

  In this embodiment, rubber is used, but any material having some elasticity may be used.

FIG. 3 shows a second embodiment.
As shown in FIG. 3, in the second embodiment, the slot stopper 8 of the first embodiment is used, and this is attached to the reinforcing bar insertion hole 5 from the outside of the side mold 3.

  Since the shapes of the side mold 3 and the slot stop 8 of the second embodiment are the same as those of the first embodiment, the same portions are denoted by the same reference numerals and the description thereof is omitted.

Next, the process and operation of manufacturing a PC floor slab using the slot stop 8 will be described.
First, as in the first embodiment, the reinforcing bars 6 and 6a are inserted into the reinforcing bar insertion holes 5 and installed in the mold 1.

  Next, as shown in FIG. 3, on the outside of the side mold 3, the slotter is arranged with its upper fitting portion 10 and lower fitting portion 11 facing the side mold 3. Then, similarly to the first embodiment, the reinforcing bars 6 and 6a are inserted into the upper reinforcing bar insertion hole 9a and the lower reinforcing bar insertion hole 9b, and the surface of the main body 9 is pressed toward the side mold frame 3 from the outside of the mold frame 1. Then, the upper fitting portion 10 and the lower fitting portion 11 are fitted into the reinforcing bar insertion hole 5 so that the locking portions 10b, 10b, 11b, 11b are hooked from the inside of the side mold frame 3 to the inner end surfaces 5b, 5c. Combine. Thereby, the main body 9 closes the reinforcing bar insertion hole 5 from the outside, and the upper end of the main body 9 is also located at the same height as the upper end of the side mold 3.

  Thereafter, ready-mixed concrete is placed in the mold 1 and the surface is pressed with a trowel to be cured and cured. Then, before removing the concrete product, the upper fitting part 10 and the lower fitting part 11 are removed from the reinforcing bar insertion hole 5 by pulling the slot stop 8 in the outer direction (lateral direction) of the side mold 3. remove.

  At this time, since the slot stopper 8 is formed of an elastic body made of rubber or the like, the upper fitting portion 10 and the lower fitting portion 11 are deformed and can be pulled out from the concrete plate, and further the reinforcing bar insertion hole 5. Can also be removed.

  Moreover, since the slot stop 8 can be removed to the outside of the side mold 3 as described above, it can be removed from the reinforcing bar insertion hole 5 when the ready-mixed concrete is cured to some extent (semi-cured state). In this state where the concrete is hardened to some extent, there is no risk that the slot will leak from the reinforcing bar insertion hole 5 even if the slot stop 8 is removed, and the concrete is still soft when the slot stop 8 is pulled out. The upper fitting part 10 and the lower fitting part 11 can be easily removed from the reinforcing bar insertion hole 5 after the operation.

  In Example 2, traces of the upper fitting portion 10 and the lower fitting portion 11 remain on the side surface of the concrete plate on which the noro stopper 8 is mounted. Since joint concrete is constructed, there is no problem with the product.

After the said process, the hardened concrete board is lifted with an appropriate means, and it demolds from the formwork 1. FIG.
As described above, the second embodiment can remove the stopper 8 before removing the concrete slab, so that it is easy to remove the resistance of the stopper 8 when removing from the mold 1. Can be demolded.

  Moreover, in this Example 2, since the noro stopper 8 is removed from the side mold 3 before demolding the concrete plate, the noro stopper 8 is removed at the place where the mold 1 is installed, The concrete plate is not moved to the storage place with the noro stopper 8 attached, and it is possible to eliminate the trouble of recovering it after removing it from the storage place and transporting it to the mold 1 later.

  Regarding the method of use, also in the second embodiment, the slot stopper 8 may be extracted from the insertion port 5d together with the concrete plate in the same manner as in the first embodiment, and may be used as appropriate according to the application.

In addition, the second embodiment has the same effects as the first embodiment.
Further, in each of the embodiments, the cutting lines 9d and 9f are formed in the vertical direction. The cutting lines 9d and 9f are provided from the reinforcing bar insertion holes 9a and 9b to the side end face side (left and right direction) of the main body 1. May be.

  Furthermore, the present invention can provide two or more reinforcing bar insertion holes and two or more cutting lines for handling even when two or more reinforcing bars are inserted into the reinforcing bar insertion hole.

1 is a side sectional view showing Example 1 of the present invention. FIG. 3 is an assembled perspective view showing the noro stopper and the mounted state of the first embodiment of the present invention. The perspective view which shows the slot stop of Example 2 of this invention, and a mounting state. Sectional drawing which shows the slot stop assumed in order to demonstrate this invention. The perspective view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Formwork 3 Side formwork 5 Reinforcing bar insertion hole 6, 6a Reinforcing bar 9 Main part 9a, 9b Reinforcing bar insertion hole 9d, 9f Cutting line 10,11 Fitting part

Claims (3)

  By forming a rebar insertion hole with an upper opening in the side mold and inserting a plurality of rebars vertically into the rebar insertion hole, the void of the rebar insertion hole generated in a portion other than the inserted rebar is removed. A concrete slot stopper for closing, a flexible main part covering the reinforcing bar insertion hole, a plurality of reinforcing bar insertion holes arranged vertically on the main part, and the reinforcing bar insertion hole from the outer end of the main part A concrete slot stop having a cutting line for inserting a reinforcing bar and a holding means for holding the main part in the reinforcing bar insertion hole.   The reinforcing bar insertion hole is provided two vertically, and the cutting line is provided from the upper reinforcing bar insertion hole to the upper end of the main part, and from the lower reinforcing bar insertion hole to the lower end of the main part. Item 1. A concrete slot stop according to item 1.   3. A concrete slot stop according to claim 1 or 2, wherein the holding means is formed by projecting a locking portion that fits and locks into a reinforcing bar insertion hole of the side mold on one side of the main body. Ingredients.

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