JPH10266428A - Permanent form - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a permanent form having sufficient strength and rigidity, which does not require hoisting equipment to be used when setting a form for in-situ concrete, and which ensures good setting operability. SOLUTION: This permanent form has placing forms 10 formed of high- strength mortar and set opposite to each other, a rib 11 or projection 12 is provided on the inside surface of each form 10, and a through hole 14 for passing a separate reinforcing bar 13 is bored in the rib 11 or projection 12 of one of the forms 10. In the rib 11 or projection 12 on the inside surface of the other form 10 which is opposite to the through hole 14, an insert 15 having an internally threaded part 15a for engagement with an externally threaded part 13a at the end of the separate reinforcing bar 13 is embedded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discarded formwork, and in particular, a structure such as a skeleton exists near a discarded formwork to be set. And that is effective when there is almost no clearance between them.

[0002]

2. Description of the Related Art A conventional mold will be described with reference to FIGS. FIG. 6 shows a conventional general formwork, and 1 shows a formwork made of wood. The formwork 1 is assembled at the site facing left and right.

The vertical pipe members 2, 2... Abut against the outer surfaces of the left and right molds 1, 1, respectively. Are arranged on the outer surface of the horizontal pipe members 3, 3, and the metal fittings 4, 4 for holding the horizontal pipe members 3, 3 are arranged on the outer surface of the horizontal pipe members 3, 3.
After passing between the horizontal pipe members 3, 3, the vertical pipe members 2, 2
In addition, the separate streaks 5 are inserted into the insertion holes of the separate streaks 5 formed in the molds 1, 1, and the inner surfaces of the molds 1, 1 in order to keep the interval between the molds 1, 1 constant. The stoppers 6 and 6 are tightly attached to the separate streaks 5 at the positions located at
4, the molds 1, 1 are fixed by tightening with nuts 7, 7, and concrete 8 is poured into the molds 1, 1.

FIG. 7 shows that when the mold is assembled, if there is almost no clearance C between the mold and the existing frame M, the molds 1 and 1 cannot be assembled. Therefore, the formwork on the side of the frame M is replaced with the formwork 1 of the wood shown in FIG.
A steel plate form 9 is used. Since the steel plate form 9 is extremely heavy, unlike the form 1 made of wood, it is installed using a hoist or the like. 6 is used on the opposite side, and the vertical pipe member 2 and the upper and lower horizontal pipe members 3, 3 are arranged on the outer surface thereof in the same manner as the mold member shown in FIG. The horizontal pipe members 3 and 3 are held by the metal fittings 4, and the stoppers 6 and 6 are fastened to the separate bars 5 as described above by inserting the separate bars 5 so that the formwork is And concrete 8 is cast.

[0005]

The prior art shown in FIG. 6 is a general formwork currently used for cast-in-place, in which the formwork is set and concrete 8 is cast. Thereafter, the nut 7 is loosened, the vertical pipe member 2 and the horizontal pipe member 3 are removed, and the form 1 is also removed. Both ends of the separate streaks 5 projecting outward from the surface of the concrete 8 are removed from the concrete. The concrete structure is constructed by cutting at the surface of No.8. When the mold is set, if there is a structure such as the existing skeleton near the mold In this case, it is difficult for a worker to enter the space between the frame and the formwork to set the formwork. Therefore, as shown in FIG. 7, the steel frame 9 is used for the frame on the skeleton side as described above.

However, the steel plate form 9 is extremely heavy, and must be set using a hoist or the like.
Furthermore, after the concrete is cast, the steel plate form 9 is buried in the concrete 8. Accordingly, the workability for setting the steel sheet form frame 9 is extremely poor, and the expensive steel sheet is buried and killed.

Therefore, an expensive and heavy material such as a steel plate form is not used, and therefore, the use of a hoist for forming a form is omitted, workability is improved, and cost is reduced. Further, a technical problem to be solved arises in order to obtain a mold having sufficient strength and rigidity as a mold, and an object of the present invention is to solve the problem.

[0008]

DISCLOSURE OF THE INVENTION The present invention has been proposed to achieve the above object, and is a disposable formwork for casting in place, wherein the disposable formwork is formed of high strength mortar. ,
And, while providing a raised portion at a predetermined location on the inner surface of the vertical frame facing each other, drilling a hole for inserting a separate streak installed between the raised frame and the counterpart formwork, In addition, the present invention provides a discarded mold formed by embedding an insert having an internal thread for screwing the tip of the separate streaks into one mold.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 shows that the existing skeleton M exists in the vicinity of the place where the disposable formwork is set, and
The setting state of the discarding form used for concrete casting in the case where there is almost no clearance C between the frame M and the discarding form is shown. In the figure, reference numeral 10 denotes a mold frame made of high strength mortar. Thus, the types of high strength mortar include fiber reinforced mortar, resin reinforced mortar, mesh reinforced mortar, and the like. The fiber-reinforced mortar includes a plant type or a mineral type such as glass fiber and asbestos, and the resin-reinforced mortar includes an epoxy resin. Also, as a mesh reinforcement reinforcing mortar, for example,
A wire mesh knitted with a 3.2φ iron wire is used.

Further, the compressive strength of the high strength mortar is 3
It is acceptable to use one of 60 kgf / cm ² or more. If so, the mold 10 of the present invention manufactured with the high-strength mortar
Has sufficient strength and rigidity, and can be formed as thin as possible, so that the weight can be reduced as much as possible.

Further, a mold 1 made of high strength mortar
0 has a rib 11 or a protrusion 12 on the inner surface as shown in FIGS. The ribs 11 or the protrusions 12 have the same shape for both of the facing mold frames 10 and 10, and the ribs 11 and the protrusions 12 are further positioned inside the ribs 11 and the protrusions 12, respectively. Is set facing. Thus, FIG.
In the right-side mold 10, that is, the rib 11 or the protrusion 12 of the mold 10 set at a position distant from the frame M, an insertion hole 14 of a separate streak 13 is formed.
The female thread that is screwed into the male thread portion 13a at the tip of the separate streak 13 is formed on the rib 11 or the protrusion 12 of the mold 10 that is set on the other side of the mold 10, that is, the mold 10 that is set on the side of the frame M. An insert 15 having a screw portion 15a is embedded.

Since the mold 10 is formed to be lightweight and thin, the mold 10 is formed by using a conventional lifting machine or the like.
It is not necessary to assemble, and it can be easily built manually. Therefore, the left and right formwork 10, 10, which are built facing each other, are assembled so as to maintain a constant interval between them by interposing the separate streaks 13. Is screwed into the female screw portion 15a of the insert 15, and the inner surface of the mold 10 on the opposite side is further provided with the separate studs 13a.
The stopper 16 is screwed onto the male screw portion 13a of
0, 10 are maintained at a constant distance from each other, and the other end of the separate streak 13 is inserted through the insertion hole 14 so that the form 10
Is projected outwardly and tightened with a nut 17 to set the driving formwork.

As shown in FIG. 2, for example, a plurality of ribs 11 are provided in a longitudinal streak, and the insertion holes 14 are formed above and below the ribs 11. 3 or 4 having square or circular projections 12, 12... At predetermined intervals in upper and lower stages, as shown in FIGS.
, The insertion hole 14 is formed, or the insert 15
May be embedded. Further, as shown in FIG. 5, a rib 11a crossing each other vertically and horizontally may be provided, and the insertion hole 14 may be formed in the crossing portion, or an insert 15 may be embedded.

The mold 10 made of the same high-strength mortar has a thickness of about 10 mm, a height of about 600 mm, and a distance between the upper and lower insertion holes 14 and 14 or the inserts 15 and 15 is about 300 mm. If the left and right lengths are set to approximately 1600 mm and then factory-produced, the material can be transported to the site at the time of casting at the site, and cut appropriately according to the situation at the site. Of course, the number and shape of the sizes, ribs, protrusions and the like should not be limited to the above-described embodiment. Further, in order to increase the adhesive force between the formwork 10 and the concrete to be cast, the inner surface of the formwork 10 may be broom-finished or a beard may be attached.

[0015] Thus, the formwork 10 set on the site,
Concrete 18 is cast into the inside of the pipe 10. After the concrete 18 is hardened, the nut 17 tightened on the side of the mold 10 opposite to the frame M is loosened to remove the nut 17, and further protrudes outward from the outer surface of the mold 10. By cutting off the separate streaks 13 of the part, the two forms 10 and 10 are buried in the concrete 18 together with the separate streaks 13 to reinforce the concrete 18 and provided inside the form 10. The ribs 11 or the protrusions 12 improve the stress of the formwork 10 in response to the shear stress and the bending stress of the separate streaks 13 when the concrete 18 is poured.

The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0017]

Since the present invention has the structure described in detail in the above-mentioned embodiment, it is particularly useful when setting a discarding frame at a position close to an existing frame and placing concrete. In addition, since the discarded formwork is formed to be lightweight and thin, it is not necessary to use a crane for formwork set as in the past, and the work of setting up the discarded formwork is extremely easy and quickly performed, thereby reducing costs. It is an invention that has a very significant effect, such as being able to secure sufficient strength and rigidity as a discarded form frame.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing an embodiment of the present invention.

FIG. 2 is a rear view of the mold shown in FIG. 1;

FIG. 3 is a rear view of a mold showing another embodiment.

FIG. 4 is a rear view of a mold according to still another embodiment.

FIG. 5 is a rear view of a mold according to still another embodiment.

FIG. 6 is a longitudinal sectional side view showing a general formwork of a conventional example.

FIG. 7 is a vertical sectional side view showing a mold of another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Formwork 11 Rib 12 Projection 13 Separate bar 14 Insertion hole 15 Insert 15a Female screw part 18 Concrete

Claims (1)

[Claims] 1. A cast-in-place frame for casting in place, wherein the cast-in frame is formed of high-strength mortar, and a raised portion is provided at a predetermined position on an inner surface of a vertical frame facing each other. A hole for inserting a separate streak bridged between the raised portion and the counterpart formwork, and a female member for screwing a tip end of the separate streak into one formwork. A disposable formwork in which an insert having a screw portion is embedded.