JP3051318B2 - Sleeve and curing lid used for it - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sleeve for forming a through hole at the time of placing concrete at a construction site, and more particularly to a sleeve which can be used as a duct after placing concrete and a curing lid for closing an end face thereof.

[0002]

2. Description of the Related Art In a construction site such as a building, when a reinforced concrete structure is used as a structural member or a partition member, a reinforcing bar is arranged inside a so-called "form" and concrete is poured into the form in that state. Thus, the structural member or the partition member is formed.

[0003] At this time, there is a case where a through hole for supplying / draining or supplying / exhausting air is required in the structural member such as a beam or the partition member such as a wall.

Conventionally, when forming the through-hole, a paper cylinder called a "void" for forming the through-hole after arranging the reinforcing bars is cut and inserted according to the size between the molds on both sides. The nail was fixed by hitting the nail obliquely from the inner wall side of the cylinder toward the wooden formwork, and concrete was poured in this state.

[0005] As another method, there has been a case in which a cylinder formed of a thin plate-shaped plated steel plate called an "actual sleeve" is nailed at both ends to a mold in the same manner as the above-mentioned void.

In the case where a duct is provided in the through hole formed as described above, the gap between the duct and the through hole is filled with concrete after duct piping for fire prevention reasons. In the event of a fire, finishing work has been performed on the partition walls and the like so that flame or smoke does not pass through the through holes.

[0007]

However, when the above "voids" are used, it is necessary to remove the voids after casting concrete because the material is easily corroded. Is a time-consuming task. In other words, since the outer wall of the void is firmly adhered to the concrete, it is necessary to place a wedge-shaped tool between the outer wall of the void and the concrete and hit it with a hammer to remove this, and to remove the void, Is long and laborious and difficult. In addition, since the nail whose void has been fixed to the mold is exposed from the surface of the through hole in the concrete, it is necessary to cut out the exposed part of the nail using a tool such as a clipper or pliers.

Further, when using the "real pipe sleeve", it is not necessary to remove the above-mentioned voids, but it is necessary to cut off the nails fixed to the formwork. Since various actual pipe sleeves that match the diameter of the through hole to be formed and the spacing of the formwork are all ordered products, it is necessary to order the required number of actual pipe sleeves from the manufacturer in advance before construction. there were. In other words, for the manufacturer, the actual pipe sleeve is very bulky in the shape of a cylinder, the diameter and dimensions of the actual pipe sleeve used differ depending on the building, etc., and the quantity used at one building site is large (average (About 3,000 to 10,000)
, There is virtually no space available for storage. Therefore, the current situation is that a manufacturer receives an order and then produces the product, and delivers an appropriate amount to the site each time.

Further, in order to form the above-mentioned through hole, there is a case where it is necessary to insert between the reinforcing bars which are already arranged at a narrow interval. In such a case, the above-mentioned actual pipe sleeve can be used. Instead, the void was divided into two in the radial direction, and each of the divided parts was arranged at a predetermined position so as to sew a narrow gap, and then the divided part was adhered with a so-called "gum tape", and further adhered. Apply a separate halved void to the outside of the part and `` gum tape ''
A very laborious technique in a small space, such as bonding and reinforcing with, has been taken.

When the above-mentioned void or the actual pipe sleeve is used for forming a through hole in a floor surface, a curing lid for preventing the inflow of the concrete when the concrete is poured is put on the upper surface thereof. This curing lid is currently
The plywood is cut on site to match the diameter of the void or the actual tube sleeve, and is simply placed on top for use. Of course, pre-made curing lids are also provided, but these curing lids are supplied in pairs with the standard diameter real pipe sleeves of the manufacturer, so they can be used for other diameters. However, it was not possible to use it as a very expensive and disposable curing lid because of its price.

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and has a sleeve which can be easily formed as a cylinder between various reinforcing bars without being bulky for storage and a curing lid which can be used as a curing lid for sleeves of various diameters. The purpose is to provide.

[0012]

According to a first aspect of the present invention, there is provided a sleeve having a cylindrical outer shape for forming a circular hole in a part of the concrete casting portion when the concrete is cast. The sleeve is formed by joining, via joining means, edges to be joined to each other so that the groove members having a U-shaped cross section which is divided into two in the radial direction are circular in cross section. Shaped groove material
To form a joint, that is, two separate cuts
A fastening portion that is raised between the cuts outward to form a hole,
It is characterized by having been formed .

The sleeve according to the second aspect of the present invention has a circular outer shape.
When casting concrete with a tube,
Part a sleeve for forming a circular hole, the
A U-shaped cross section in which a cylindrical sleeve is split in two in the radial direction
Try to join each other so that the cross-section becomes circular
The edges are constituted by joining via joining means
At the same time, the fastening portion is
To form two spaced apart cuts with both sides inside
It is characterized by forming a hole-shaped fastening part that is recessed in the direction
And

According to a third aspect of the present invention, in the sleeve according to the first or second aspect , the joining means is formed integrally with a groove having a U-shaped cross section.
The labor at the time of joining can be saved, and the total cost can be reduced by reducing the number of parts.

According to a fourth aspect of the present invention, in the sleeve according to any one of the first to third aspects, the joining means includes a groove member having a U-shaped cross section.
A U-shaped joining groove having a narrow groove width formed on one edge;
If it is constituted by an insertion member formed on the other edge and capable of being inserted and engaged in the coupling groove, it can be easily manufactured, and the two U-shaped groove members having the respective cross sections U have the same shape. The effect of mass production can be enhanced, and the inflow of concrete from the joint can be effectively prevented.

Further, the sleeve of the claims 5, wherein the above
The sleeve according to any one of claims 1 to 4 , wherein a fastening piece is provided at an end in the groove direction of the groove member having a U-shaped cross section so as to be freely bent outside the groove. This is convenient when fixing the sleeve to the formwork with nails, and the nail fixed to the formwork through the outwardly bent fastening piece automatically removes the formwork when the formwork is removed. The nails can be easily removed from the fasteners by falling out of the fasteners and the fasteners falling down.
When this sleeve is used as a vertical through hole (meaning a hole that penetrates vertically on the floor or ceiling, etc.), if there is a gap between the concrete through hole and the duct inserted therethrough, When the fastening piece of the sleeve forming the peripheral wall of the through hole is bent inside the sleeve, concrete for finishing can be poured into the gap between the sleeve and the duct to easily fill the gap. Therefore, in this case, there is no need to perform a curing operation of a backing plate or the like that closes the through hole and the lower surface of the duct, which is required in the above-mentioned conventional finishing work.

Further, the sleeve according to claim 6 of the present application is
The sleeve according to any one of claims 1 to 4 , wherein the two sleeves are telescopically slidable with respect to each other, and can be used even when the dimensions between the molds are variously different. It becomes a sleeve with.

[0018] Then, in the sleeve of the claim 6, when the diameter of the outer sleeve slightly larger than the diameter of the inner sleeve, excessive load to the joint portion of and outside of the sleeve become the slide smoothly Does not work.

A curing lid according to a seventh aspect of the present invention is a curing lid for closing an end face of the sleeve according to the fifth aspect, wherein the curing lid has a fixing hole through which the fastening piece penetrates. Features.

The curing lid according to claim 8 of the present invention is the curing lid according to claim 7 , wherein at least one position of each of a plurality of concentric circles corresponding to the respective diameters of the plurality of sleeves having different diameters. When the fixing holes are formed, one type of curing lid can be used for sleeves having different diameters.

[0021]

According to the sleeve according to the first or second aspect of the present invention, since the sleeve is divided into two in the radial direction, when storing, the groove members each having a U-shaped cross section are overlapped in the same direction. If they are combined, they can be stored without being bulky, that is, in a state in which they are bulky substantially by the thickness of the sleeve. Accordingly, it is possible to increase the storage rate by a factor of 10 or more as compared with the conventional sleeve.

The pick-up according to claim 1 or 2,
The head further has a hole-shaped fastening part as described above.
Wire between the joint and the rebar.
Can be fastened and fixed.

Further, even if the reinforcing bars are arranged at a narrow interval in the formwork, two U-shaped groove members each having a small cross-sectional area and each of which can be somewhat deformed are separately passed between the reinforcing bars. Since the sleeve may be located at a predetermined position and the two groove members may be joined at that position, the sleeve can be easily arranged at a desired position.

Further, according to the curing lid according to the invention of claim 7, wherein, the fastening piece is protruded fastening piece from the end surface of the sleeve is arranged a cured lid so as to pass through the fixing hole of the curing cover the sleeve side In addition, the curing lid can be fixed to the sleeve by bending the fastening piece, so that the curing lid is not lifted by the concrete at the time of placing the concrete and the concrete does not flow into the sleeve.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments according to the present invention will be specifically described below with reference to the drawings.

FIG. 1 is an overall perspective view showing the structure of a sleeve according to an embodiment of the present invention, and FIG. 2 is a perspective view of the sleeve shown in FIG. 1 disassembled into two U-shaped grooves. It is.

In FIGS. 1 and 2, A denotes a sleeve, and 1 denotes a sleeve.
Is a groove member constituting the sleeve A.

As shown in FIG. 2, the groove member 1 has a U-shaped cross section, and a joining groove 2 having a narrow groove width is formed on one edge 1a of the U-shape. This engagement groove 2 is shown in FIG.
As shown in FIG. 1, a joining groove 2 having a locking piece 2a on an edge 1a is formed by bending a material plate a plurality of times (four times in this embodiment).

As shown in FIG. 2, an insertion portion 3 of the groove material 1 as it is is formed on the other edge 1b of the U-shape. Further, in this embodiment, the insertion portion 3 is formed with an engagement projection 3a whose surface is inwardly recessed by pressing.

The groove width w (see FIG. 3) of the joining groove 2 is formed slightly larger than the thickness t of the insertion portion 3 (see FIG. 2B). 3a is the engagement groove 2
Is configured to be hooked on the locking piece 2a (see FIG. 3). In this embodiment, the joining groove 2 and the insertion portion 3
Constitute the joining means.

The groove member 1 is formed in a U-shaped cross section by pressing or rolling a plate-shaped member. Is distorted from a strict linear shape to a slightly wavy shape, and the bonding between the groove members 1 is made more reliable.

At the end 1c of the groove member 1 in the U-shaped groove direction, a rectangular fastening piece 4 whose base end extends from the base side of the groove member 1 is provided. At the center of each of the fastening pieces 4, a hole 4a for fastening is formed. Also,
In order to increase the strength for maintaining the shape, the end 1c of the groove member 1 provided with the fastening piece 4 is formed by bending a material plate as shown in FIG. This is a structure in which another material having a fastening piece 4 is fitted to the bent portion. The material of the fastening piece 4 is the groove material 1
It is made of a thin plate material to make it easier to bend as compared with the above material. For example, when the material of the groove 1 is 0.5 mm, the material of the fastening piece 4 is a 0.27 mm plate.

Further, the groove member 1 is formed with recesses (or projections) 8 at appropriate intervals in the circumferential direction in order to maintain the U-shaped cross section.

Further, on the peripheral surface of the groove member 1, there is formed a fastening portion 5 for passing the wire when the wire is fixed to a reinforcing bar or the like. The fastening portion 5 is provided with two cuts at positions spaced apart from each other on the peripheral surface of the groove material 1, and by projecting a wall surface located between the cuts outward, a hole through which a wire can pass between the two cuts. It is done by forming.

In this embodiment, as shown in FIG. 5, the two sleeves A (A1, A2) are slidably nested. A slightly larger groove 1 (a groove 1 constituting the sleeve A2) is prepared.

In this embodiment, the groove material 1
The rigidity on the side of the joining groove 2 as one edge 1a is higher than the rigidity of the insertion portion 3 as the other edge 1b, and the groove 1 is easily deformed in a diagonal direction.

In FIG. 6, B is the sleeve A
The curing lid B for closing the end face a of the
The outer diameter is larger than that of the sleeve A, so that it can be used from a sleeve having a smaller diameter (not shown) to a sleeve having a larger diameter (not shown). A plurality of circular grooves 6 are formed. On each groove 6, a fixing hole 7 through which the fastening piece 4 at the end in the groove direction of the sleeve A (groove material 1) is formed. In this embodiment, two fixing holes 7 are provided for each sleeve. However, three or more fixing holes may be provided as necessary.

The sleeve A and the curing lid B configured as described above operate as follows in use.

That is, one of the groove members 1 constituting the sleeve A is arranged at a predetermined position of the formwork in which the reinforcing bar is disposed while avoiding the reinforcing bar. At this time, the groove material 1 itself has considerable rigidity in the groove direction and in a direction perpendicular to the groove direction (the chord direction of the groove material 1), but is slightly deformed due to the thin plate, and in the diagonal direction. Since is deformed to some extent as described above, it can be easily positioned at a predetermined position.

Next, the other groove member 1 is arranged at a predetermined position similarly to the one groove member 1 described above. At this time, when the one groove member 1 is joined to the other groove member 1, they are arranged in a cylindrical state. The one groove member 1 and the other groove member 1 are physically the same groove member, and one of them is rotated by 180 degrees for use.

Then, the insertion portion 3 of one groove member 1 is fitted into the joining groove 2 of the other groove member 1.

At this time, the insertion portion 3 and the engagement groove 3 are firmly joined by the engagement protrusion 3a formed on the insertion portion 3.

Subsequently, when the insertion portion 3 of the other groove member 1 is fitted into the joining groove 2 of the one groove member 1, a sleeve A (A1) as shown in FIG. It is formed.

In this state, the insertion portion 3 of each groove member 1 having relatively low rigidity is inserted into the other groove member 1 respectively.
Since the cylinder is fitted into the highly rigid joining groove 2, the cylinder as a whole has very high rigidity in all directions.

When fixing to the formwork side, the fastening piece 4 of each of the groove members 1 is attached to the outer side of the sleeve A.
It is bent so as to be in the extension surface of the end face of (A1) (see FIG. 5).

Next, a sleeve A2 having a slightly larger diameter is joined by the same procedure as described above, and with the distal end covering the base end of the sleeve A1.

In this state, the sleeve A1 and the sleeve A2 are slidably set in a telescopic manner at predetermined positions in the mold.

Next, in this state, the end surfaces of the sleeves A1 and A2, which are the telescopically set ends, are brought into contact with the formwork.
If necessary, the sleeves A1 and A2 are fixed to the mold by passing a nail through the hole 4a of the fastening piece 4 formed on the end face of each of the sleeves A1 and A2 and hitting the tip of the nail toward the mold.

Although not shown, the sleeves A1, A2
Can be fixed to a reinforcing bar at a nearby position by passing a wire through the fastening portion 5.

Therefore, even if concrete is cast in this state, the sleeves A1 and A2 remain firmly fixed at the predetermined positions.

When the mold is removed after a predetermined period of time, the nail that has been driven into the hole 4a of the fastening piece 4 is pulled together with the mold, and the fastening piece 4 rises from the concrete casting surface. State. Therefore, the nail is connected to the fastening piece 4
Can be easily removed from the hole 4a.

The sleeves A1 and A2 raise the fastening piece 4 in a direction coinciding with the longitudinal direction of the sleeve, and rivets or tap screws or the like are attached to the duct side having the same diameter or a slightly smaller diameter as the sleeves A1 and A2. Once attached, it can be used as part of a duct.

When the sleeve A is used for forming a through hole in the floor surface, the sleeve A is set at a predetermined position in the gap between the reinforcing bars as described above, and when the setting is completed, it is shown in FIG. The curing lid B (see FIG. 6) is placed on the upper end surface of the sleeve A so that the fastening piece 4 of the sleeve A is raised in the longitudinal direction of the sleeve A and the fixing lid 4 is fixed to the fixing hole 7 of the curing lid B. When inserting and bending the fastening piece 4, the curing lid B is fixed to the sleeve A.

Therefore, even if the concrete is poured on the floor, the concrete does not flow into the sleeve A, and the curing lid B rises from the sleeve A even if the concrete is put near the upper end of the sleeve A. Never.

Even if the site is left unattended in this state, even if rain falls from above, it does not flow down below. Therefore, measures such as forming a bank around the sleeve with concrete around the sleeve to prevent rainwater from flowing down become unnecessary as in the prior art.

When the concrete is poured to the same height as the curing lid B, the concrete hardens and the curing lid B
When the is removed from the sleeve A, the concrete is dented by the thickness of the curing lid B, and a secondary effect of eliminating the filing work for mounting the toilet is also produced.

When a small-diameter duct is arranged in a vertical through-hole provided on a floor surface or the like while adjusting the position as described above, the use of the sleeve A having the above-described structure makes it possible to easily carry out concrete as follows. A that forms the peripheral wall of the through hole with
And the gap between the duct can be filled. That is, in such a case, all of the fastening pieces 4 of the sleeve A are inwardly aligned with the extension of the end face (reference numeral 4 of the fastening pieces in FIG. 5).
If the concrete is poured from above into the gap between the sleeve A and the duct, which is substantially closed by the bent fastening piece 4, the gap can be easily filled. it can. Further, in the case of such a usage mode, the cover may be closed by the curing lid B instead of being closed by the fastening piece.

In the above-described embodiment, an example in which a thin plate-shaped plated steel plate is used as the material of the sleeve has been described. However, the sleeve may be made of plastic or another material instead of it. Needless to say, it can be implemented.

Although not mentioned in the above embodiment,
If one end of the sleeve is set so as not to reach the mold, and the curing lid is fixed to the end face, a bottomed hole can be formed in addition to the through hole.

[0060]

According to the sleeve of the present invention, since the sleeve is not bulky at the time of storage, if it is standardized, it can be mass-produced as a standard product in advance and stored in a warehouse. Also, since the exclusive space for storage is small even at the site, it is possible to prepare (store) only the necessary amount in advance.

Further, according to this sleeve, since the radially divided part is finally joined to form a cylindrical shape, it can be simply and arbitrarily arranged at a place where the reinforcing bar is provided. it can. In addition, since the sleeve is a so-called actual tube sleeve type which does not need to be removed, there is an advantage that it does not take time to remove the sleeve.

Further, in the case of the sleeve provided with the fastening piece, the nail can be easily fixed to the mold, and even if it is fixed with the nail, the nail is easily detached when the mold is removed, so that the fixing is securely performed. There is an advantage that it does not take much time to do it.

Further, according to the curing lid of the present invention, since it can be fixed to the sleeve reliably, it is possible to reliably prevent concrete from flowing into the sleeve.

Furthermore, since the curing lid can be fixed securely to the sleeve, even if the curing lid becomes slightly larger than the diameter of the sleeve, the curing lid does not rise at the time of concrete casting. One type of curing lid can be used.

Therefore, it is possible to mass-produce an excellent curing lid capable of reliably preventing the inflow of concrete, and it is possible to supply inexpensively by this mass production effect.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing a configuration of a sleeve according to an embodiment of the present invention.

FIGS. 2 (a) and 2 (b) are perspective views respectively showing two sleeves having a U-shaped cross section constituting the sleeve shown in FIG. 1 in an exploded state.

FIG. 3 is a partially enlarged view taken along the line II of FIG. 2A, showing a detailed configuration of a joining groove formed at an edge of the groove member shown in FIG. 2;

FIG. 4 is a partially enlarged view taken along the line II-II of FIG. 2 (b), showing a detailed configuration of a fastening piece formed at an end of the groove member shown in FIG. 2 in the groove direction.

5 is a perspective view showing an embodiment in which two sleeves having slightly different diameters shown in FIG. 1 are slidably used in a telescopic manner.

FIG. 6 is a plan view showing a configuration of a curing lid for closing an end face of the sleeve shown in FIG. 1;

7 is a perspective view showing a state in which a curing lid shown in FIG. 6 is attached to an end face of the sleeve shown in FIG. 1;

[Explanation of symbols]

 A (A1, A2) ... sleeve B ... curing lid 1 ... groove material 1a ... one edge of the groove material 1b ... the other edge of the groove material 2 ... joining groove (one configuration of joining means) 3 ... insertion part (joining) 4 ... fastening piece 7 ... fixing hole

Claims (8)

(57) [Claims] 1. A sleeve for forming a circular hole in a part of a concrete casting portion when the concrete is cast with a cylindrical outer shape, wherein said cylindrical sleeve is divided into two sections in a radial direction.
Is formed by joining the edges of the U-shaped groove members to be joined to each other so that the cross section becomes a circle via joining means.
At the same time, the fastening portion is separated into the groove material having the U-shaped cross section.
To form two cuts and raise the gap between the cuts outward
A sleeve , wherein a fastening portion having a hole shape is formed . (2) The outer shape is cylindrical and is suitable for concrete casting.
To form a circular hole in a part of concrete
A sleeve, the sleeve of the cylinder and the split in the radial cross section U
To join each other so that their cross-sections are circular
By joining the edges that
At the same time, the fastening portion is separated into the groove material having the U-shaped cross section.
To form two cuts and dent both sides of the cut inward.
A slot characterized by forming a fastening part in the shape of a hole
Ave. Wherein said bonding means is, claim 1, characterized in that it is integrally formed on the shaped groove member of the cross-section U or
2. The sleeve according to 2 . 4. A joining member formed on one edge of the groove member having a U-shaped cross section and having a narrow U-shape, and the joining groove formed on the other edge. 2. An insertion member which can be inserted into and engaged with the inside.
The sleeve according to any one of the items 1 to 3 . 5. A groove direction ends of the shaped groove member of the cross-section U, either to claims 1 to 4, characterized in that the fastening piece freely bent outwardly of the groove is provided The sleeve according to item 1. 6. The sleeve according to any one of claims to claim 1, characterized in that with the sleeve in two mutually slidably telescopically. 7. A curing lid for closing an end face of a sleeve according to claim 5 , wherein a fixing hole through which the fastening piece penetrates is formed in the curing lid. 8. The curing lid according to claim 7 , wherein the fixing holes are formed at at least one position of a plurality of concentric circles corresponding to the diameters of the plurality of sleeves having different diameters. The curing lid as described.