JP3051342B2 - sleeve - 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 casting concrete at a construction site, and more particularly to a sleeve which can be used as a duct after the casting of concrete and which is divided in a radial direction.

[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.

[0006] However, in the case of the above-mentioned conventional paper-made cylinder or sleeve constituted by an "actual pipe sleeve", it is difficult to remove the concrete after casting, or it is custom-made for each required diameter and longitudinal dimension. In view of the inefficiency of the production of these sleeves, the inefficiency of storage of these sleeves in factories and sites, or the low assemblability in a narrow space, the applicant has taken the removal work after concrete casting. Is not required, the versatility and the storage property are excellent, and the sleeve which is excellent in the assemblability in a narrow space and is divided into two in the radial direction is provided (Japanese Patent Application No. 7-776).
06).

[0007] The sleeve provided by the present applicant is an epoch-making sleeve that solves the various technical problems described above.

[0008]

However, in the case of the above-mentioned sleeve structure, the joining means for joining the U-shaped groove members to each other is a joining groove having a narrow groove width formed at the end of one of the groove members. And an insertion member formed at the corresponding end of the other groove material and inserted into and engaged with the joint groove. The formation of the joint groove having a small groove width requires three bending steps in the manufacturing process. In this part, a laborious work in manufacturing was forced.

In addition, if the gap of the above-mentioned joint groove is not appropriate, it will come off after joining, and if the gap is too narrow, a large press input is required for the joining operation. I needed to do it.

At present, these factors have hindered providing the sleeve at a lower cost.

SUMMARY OF THE INVENTION In view of the above situation, the present invention is to provide a sleeve which is fundamentally superior to conventional sleeves and which can be easily manufactured and provided at a low cost. With the goal.

[0012]

According to a first aspect of the present invention, there is provided a sleeve for forming a circular hole in a part of a concrete casting portion when the concrete is cast in a cylindrical shape. Edges that are to be joined to each other so that the halved grooved material having a U-shaped cross section has a circular cross section,
In a cylindrical sleeve formed by joining via joining means, the joining means is provided with a slit hole extending in a groove direction formed on an edge of a groove material having a U-shaped cross section on one side, and a slit formed on the other section U. constituted by a tongue which is inserted and locked into shaped groove member edge the slit holes extending in the circumferential direction of the result
In both cases, reduce the width of the tongue at the base of the tongue
A constricted portion is formed .

[0013] However, in the sleeve having the above-described configuration, it is only necessary to form a slit hole on one edge of the groove member having a U-shaped cross section and a tongue piece on the other edge. It can be easily formed simply by press molding. That is, at the time of the press work for cutting out the outer shape before bending into a U-shape, the outer shape can be formed simultaneously with the cutting of the outer shape. Then, when joining the halved groove members each having a U-shaped cross section, the two groove members are inserted into each other, the tongue of one groove member is inserted into the slit hole of the other groove member, and the other groove member is inserted. If the tongue pieces of the other groove material are joined to the slit holes so as to be inserted and locked, a cylindrical sleeve can be easily formed.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As in the sleeve according to the second aspect of the present invention, in the sleeve according to the first aspect, the rear edge portion of the slit hole in the tongue piece insertion direction is configured to protrude from the surrounding surface. In addition, it is possible to easily insert the tongue pieces into the slit holes and perform the joining during the joining operation.

[0015]

Further, as in the sleeve according to the third aspect of the present invention, in the sleeve according to the first or second aspect,
If a tongue base is formed with a stepped protrusion at the base of the U-shaped groove at the base of the tongue and the base end side of the base is stepped, when the tongue is inserted into the slit hole, The base can be locked by simply inserting it into the front edge of the slit hole, and joining and locking can be easily performed.

Further, as in the sleeve according to the fourth aspect of the present invention, in the sleeve according to the second aspect, a U-shaped projection of a shallow groove is formed in a direction perpendicular to the groove of the U-shaped groove member. When the height of the projection is approximately equal to the height of the projection of the top of the projection and the rear edge of the slit hole, a predetermined rigidity can be obtained even when the sleeve is formed of a thin plate, and the height is increased as described above. Since the two sleeves are configured to be approximately equal, the slide can be made smoother when the two sleeves are slidably inserted into the nest type, and when the concrete is cast, concrete enters the sleeve. Can be difficult.

Further, as in the sleeve according to claim 5 ,
In the sleeve according to the first aspect of the present invention, if one end of the groove member having a U-shaped cross section in the groove direction is formed with a fastening piece that is once folded outward and the front end side is again folded inward, When a nail is fixed to a mold or the like using a piece, the fastening piece can be easily erected at a desired angle with a weak force, and when the erected piece is erected, the fastening part is provided with a sleeve. Since it is located at a position separated from the end surface (part separated from the end surface by the amount of the turnback), the end surface of the sleeve can be easily set along the surface of the mold or the like.

In the sleeve according to the fifth aspect of the present invention, like the sleeve according to the sixth aspect of the present invention, an inner wall of a groove member having a U-shaped cross section at the distal end as compared with the base end at the distal end of the fastening piece. If the inclined surface inclined in the direction away from the upper surface is formed, the tip of the fastening piece can be easily erected with the tip of a finger or the like when erecting.

Further, as the sleeve of the present application according to claim 7, in the sleeve of the claims 5 or 6, wherein the base of the fastening piece, to form a constricted portion to narrow the width of the fastening strips, the base of the fastening piece The part can be easily erected with a finger.

Further, as the sleeve of the present application according to claim 8, the ratio in the sleeve according to any one of the terms up to the claims 1 to 7, two sets of sleeves, the one set those other set If the two sets of sleeves are slidably used in a telescopic manner with a slightly larger diameter, the sleeves can be used between molds of any dimensions.

[0022]

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 one 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 is a sleeve, and 1 is a sleeve.
Is a groove member that forms the sleeve A by being joined to each other.

As shown in FIG. 2, the groove member 1 has a U-shaped cross section, and one edge 1a of the U-shape, more precisely, a portion slightly entering from the edge 1a, A slit hole 2 extending in the groove direction is formed. As shown in FIG. 3, the slit hole 2 has a rear edge 2a of the slit hole 2, that is, a rear edge (inner edge) 2a of the tongue insertion direction X (see an arrow in FIG. 3). It is configured to protrude from the surrounding surface in the outer radial direction.

As shown in FIG. 2, a tongue piece 3 extending in the circumferential direction from a plate made of the material of the groove material 1 is provided on the other edge 1b of the U-shape corresponding to the slit hole 2. It protrudes in the direction. Further, in this embodiment, a constricted portion 3a is formed in which the width w of the base portion of the tongue piece 3 is reduced in plan view (when viewed from the outer peripheral direction). Then, adjacent to the distal end of the constricted portion 3a, the groove 1
Are formed with locking projections 3b protruding toward the inner diameter side. As shown in FIGS. 3 and 4, the protrusion 3b is stepped at the base end side of the protrusion 3b, and the tongue piece 3 is inserted into the slit hole 2 of another groove material 1 to be joined. When
The stepped portion is configured to be engaged with the leading edge 2b of the slit hole 2 in the tongue insertion direction X (see the arrow in FIG. 3).

As shown in FIG. 2, the planar shape of the tongue piece 3 is a substantially trapezoidal shape in which the dimension in the width direction becomes narrower toward the tip so that insertion into the slit hole 2 can be performed smoothly. (Or cannonball).

By the way, as shown in FIG. 2, a portion of the groove member 1 where the slit hole 2 and the tongue piece 3 are not provided,
A U-shaped projection 4 of a shallow groove extending in the circumferential direction is formed. The projections 4 contribute to increasing the second moment of area and increasing the rigidity of the groove material 1. In this embodiment, two grooves are formed except for the end portion, but an appropriate number is formed according to the size of the groove material 1 in the groove direction.

Further, the projection 4 is configured such that the top of the projection 4 and the projecting dimension of the rear edge 2a of the slit hole 2 are substantially equal.

At the end 1c of the groove member 1 in the U-shaped groove direction, a rectangular fastening piece 5 having a base end extending from the base side of the groove member 1 is provided. At the center of each of the fastening pieces 5, a hole (stop hole for a nail or the like) 5a for fastening is formed. Also, the groove member 1 provided with the fastening piece 5
In order to increase the strength for maintaining the shape, the end 1c is bent three times so that the plate of the material is once folded outwardly and then the tip side is folded inward as shown in FIG. The fastening piece 5 is formed at the bent end portion. A constriction is formed at the base end 5b of the fastening piece 5 to facilitate bending, and the base end 5b is formed outside the groove 1. In addition, an inclined portion is formed in the distal end portion 5c of the fastening piece 5 such that the distal end side is separated from the inner wall of the groove 1 as compared with the base end side.
Also, both corners 5d of the tip are provided with a curing lid B (FIG. 1) described later.
2) to facilitate insertion into the fixing hole 7 formed with
So-called chamfering is performed.

In this embodiment, as shown in FIG. 6, since the two sleeves A (A1, A2) are slidably nested, the diameter (radius) is structurally the same. A slightly larger groove 1 (a groove 1 constituting the sleeve A2) is prepared.

In FIG. 12, reference numeral B denotes a curing lid for closing the end surface a of the sleeve A.
Has a larger outer diameter than the above-mentioned sleeve A and a concentric circle conforming to the outer shape of the sleeve used therein so that it can be used from a sleeve having a smaller diameter (not shown) to a sleeve having a larger diameter (not shown). Circular groove 16
Are formed. A fixing hole 17 is formed on each groove 16 so that the fastening piece 5 at the end of the sleeve A (groove material 1) in the groove direction can pass therethrough. This fixing hole 17
In the case of the present embodiment, two sleeves are provided, but three or more sleeves may be provided as necessary.

The sleeve A and the curing lid B configured as described above operate as follows when used.

That is, one of the groove members 1 constituting the sleeve A is arranged at a predetermined position of the mold 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. To some extent,
It can be easily located 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 above one groove member 1 and the other groove member 1
Are physically the same groove material, one of which is rotated by 180 degrees for use.

Then, the tongue piece 3 of one groove member 1 is inserted into the slit hole 2 of the other groove member 1 until the step of the projection 3b engages with the edge of the slit hole 2 (FIG. 3). (See FIG. 4).
At this time, since the tongue piece 3 has the constricted portion 3a, it is easily bent at this portion, and it is easy to insert and engage as described above.

Subsequently, the base end of the groove member 1 having a slightly larger diameter than the groove member 1 is partially overlapped with the base end of the groove member 1 (that is, in such a manner as to be opposite to each other in the groove direction). 2) and assemble into the sleeve A in the same manner as described above (see FIG. 6).
By such a simple operation, the sleeve A (A1, A2) as shown in FIG. 6 is formed at a predetermined position between the forms between the reinforcing bars. In this state, the sleeve A1 and the sleeve A2 are slidably and telescopically set at predetermined positions in the mold.

In this state, since each pair of the groove members 1 becomes an integral cylindrical sleeve A (A1, A2), the two sleeves A1, A2 are used so as to partially overlap. Therefore, a very rigid cylindrical body is obtained in all directions regardless of the thin plate.

When fixing to the formwork side, as shown in FIG. 6, the fastening pieces 5 at both ends of each of the sleeves A1, A2 are extended outwardly from the end face a of each of the sleeves A1, A2. Bend it into the plane.

Next, in this state, the end faces of the sleeves A1 and A2, which are the both ends set telescopically, are brought into contact with the mold.
As required, the sleeves A1 and A2 are fixed to the mold by passing a nail through the hole 5a of the bent fastening piece 5 of each of the sleeves A1 and A2 and hitting the tip of the nail toward the mold.

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

When the mold has been removed after a predetermined time, the nail driven into the hole 5a of the fastening piece 5 is pulled together with the mold, and the fastening piece 5 rises from the concrete casting surface. State. Therefore, the nail is fastened to the fastening piece 5
Can be easily removed from the hole 5a.

The sleeves A1 and A2 raise the fastening piece 5 in a direction coincident with the longitudinal direction of the sleeve, and use the holes 5a on the duct side having the same diameter or a slightly smaller diameter as the sleeves A1 and A2. Then, if it is attached with rivets or tap screws, it can be used as it is as a part of the duct.

When the sleeve A is used to form a through hole in the floor, the sleeve A is assembled and set at a predetermined position in the gap between the reinforcing bars as described above. As shown in FIG.
The curing lid B is placed on the upper end surface of the sleeve A, and at this time, the fastening piece 5 of the sleeve A is raised so as to coincide with the longitudinal direction of the sleeve A and is inserted into the fixing hole 17 of the curing lid B. Is bent (see arrow Y in FIG. 13), 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 even if the concrete is put near the upper end of the sleeve A, the curing lid B rises from the sleeve A. Never.

In this state, even if the site is left unattended, even if rain falls from above, it does not flow downward. 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.

Moreover, 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 when attaching the toilet is also produced.

When a small-diameter duct is disposed in a vertical through-hole provided on a floor or the like while adjusting the position as described above, if the sleeve A having the above structure is used for forming a vertical through-hole, The gap between the sleeve A and the duct, which forms the peripheral wall of the through hole, can be easily filled with concrete. That is, in such a case, all of the fastening pieces 5 located at the lower end of the sleeve A are inwardly aligned with the extension of the end face (in the fastening piece of FIG. (The folded state) to substantially close the gap between the duct and the sleeve A. If concrete is poured from above into the gap between the sleeve A and the duct, the gap can be easily filled. Can be. 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.

By the way, a sleeve having a simpler construction may be used in place of the sleeve. Specifically, this sleeve A is formed by combining the groove members 1 having the configuration shown in FIG. 7 and has a configuration as shown in FIG. 8, and the sleeve A shown in FIG. The point where the rear edge 2a (see FIG. 2) of the hole 2 does not protrude, and the protrusion 3b (see FIG.
Is not formed. Other configurations are basically the same as those of the embodiment shown in FIGS. 1 to 6 described above.

That is, as shown in FIG. 7 and FIG.
A slit hole 2 extending in the groove direction of the groove member 1 is formed in one edge 1b of the groove member 1 at a position slightly entering from the edge 1b. On the other edge 1b of the groove member 1, a tongue piece 3 to be inserted into the slit hole 2 of the other groove member 1 protrudes in a circumferential direction at a position corresponding to the slit hole 2. In this embodiment, similarly to the above embodiment, a narrow portion 3a is formed at the base end of the tongue piece 3 to facilitate bending of the tongue piece 3, and the tongue piece 3 has a flat surface. The shape is a substantially trapezoidal shape (or a cannonball shape) in which the dimension in the width direction becomes thinner toward the tip.

The sleeve constructed in this manner is assembled in substantially the same manner as in the above embodiment, and the sleeve is used in the same manner as in the above embodiment as shown in FIGS. It performs almost the same function. However,
Since the projection 3b is not formed on the tongue piece 3, as shown in FIG. 9, the locking of the tongue piece 3 after insertion into the slit hole 2 shows the tip of the inserted tongue piece 3 in FIG. In that it is made by bending. In addition, since the rear edge of the slit hole 2 does not protrude from the surrounding surface in the outer diameter direction, when inserting the tongue piece 3 into the slit hole 2, the tongue piece 3 is previously inserted into the slit hole 2 as shown in FIG. It is different in that it is easy to enter and it is necessary to bend in the outer diameter direction, and the workability at the time of joining is inferior. Furthermore, the tongue piece 3 is inserted from the inside of the slit hole 2 to the outside, that is, the edge 1b side having the tongue piece 3 is inward, and the edge 1a having the slit hole 2 is outside. The difference is that the workability is slightly inferior due to these differences.

However, in any of the sleeves described in the above two embodiments, the joining means can be formed instantaneously at the time of press cutting of the mold, and therefore, the productivity is higher than the conventional sleeve according to the present applicant's invention. Is much better, and therefore can be provided at lower cost.

By the way, 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, but 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.

[0055]

According to the sleeve according to the invention of the present application, the joining means, which requires time and equipment in the conventional sleeve, can be formed instantaneously at the time of press cutting with a mold for forming the outer shape of the sleeve. Therefore, it can be provided at a much lower cost and in a shorter time than the conventional sleeve.

Further, like the conventional sleeve provided by the present applicant, since it is not bulky at the time of storage, if 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. In addition, since the radially divided parts are finally joined to form a cylindrical shape, the parts can be easily arranged in a predetermined manner at the place where the reinforcing bar is provided. 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. Also, in the case of a sleeve with fastening pieces, it can be easily fixed to the formwork, and even if it is fixed with nails, the nails can be easily removed when removing the formwork, so it can be securely fixed There is an advantage that it does not take time.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing a configuration of a sleeve according to a first 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 view showing a detailed configuration of a joining means (a slit hole and a tongue piece) formed on an edge of a groove material shown in FIG. 2 before joining.

FIG. 4 is a partially enlarged view taken along the line II-II of FIG. 2B, showing a state in which the tongue piece is inserted into and engaged with the slit hole.

FIG. 5 is a partially enlarged view showing a detailed configuration of a fastening piece portion of the sleeve shown in FIG. 1;

FIG. 6 is a perspective view showing a state where two sets of sleeves having a configuration as shown in FIG.

FIG. 7 is an overall perspective view showing a configuration of a sleeve according to a second embodiment of the present invention.

8 (a) and 8 (b) are perspective views respectively showing two sleeves each having a U-shaped cross section constituting the sleeve shown in FIG. 7 in an exploded state.

FIG. 9 is a partially enlarged cross-sectional view showing a state where a tongue piece is inserted into a slit hole formed on an edge of the groove member shown in FIG. 2;

10 is a partially enlarged view taken along the line II-II in FIG. 7, showing a state in which the tongue piece is bent and locked in the slit hole from the state in FIG. 9;

FIG. 11 is a perspective view showing a state where two sets of sleeves having a configuration as shown in FIG.

FIG. 12 is a plan view showing the configuration of a curing lid attached to one end of a sleeve having the configuration shown in FIG. 1 or FIG.

13 is a perspective view showing a state before a curing lid is attached to one end of the sleeve shown in FIG. 1 and a fastening piece is bent and fixed;

FIG. 14 is a perspective view showing a state before a curing lid is attached to one end of the sleeve shown in FIG. 7 and a fastening piece is bent and fixed;

[Explanation of symbols]

 A (A1, A2) ... sleeve B ... curing lid 1 ... groove material 1a ... one edge of groove material 1b ... other edge of groove material 2 ... slit hole (one configuration of joining means) 3 ... tongue piece (joining Another configuration of the means)

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 in a cylindrical shape, wherein a groove member having a U-shaped cross section radially divided into two sections is formed. In a cylindrical sleeve constituted by joining edges to be joined to each other so as to form a circle via joining means, the joining means is formed on one edge of a U-shaped groove material having a U-shaped cross section. and a slit hole extending in the groove direction, as well as constituted by a tongue which is inserted and locked into the slit holes extending to the edge of the shaped groove member on the other section U in the circumferential direction, the root portion of the tongue , Constriction to narrow the width of the tongue
A sleeve formed with a minute portion . 2. The sleeve according to claim 1, wherein a rear edge portion of the slit hole in a tongue piece insertion direction is configured to protrude from a surrounding surface. 3. The base portion of the tongue piece is formed with a projection which projects toward the inner diameter side of the U-shaped groove member and has a stepped base end side. 2. The sleeve according to 2. 4. A shallow U-shaped projection is formed in a direction perpendicular to the groove of the U-shaped groove material, and the height of the top of the projection and the height of the projection of the rear edge of the slit hole are substantially equal. 3. The sleeve of claim 2, wherein said sleeve is configured to be equal. 5. A fastening piece having a U-shaped cross section having a U-shaped cross-section and having one end folded in an outward direction and a front end folded inward at one end thereof. 1
The described sleeve. 6. A front end portion of the fastening piece is formed with an inclined surface whose front end side is inclined in a direction away from an inner wall of the groove member having the U-shaped cross section as compared with a base end side. Do
The sleeve according to claim 5 . A root portion according to claim 7, wherein the fastening piece, wherein, characterized in that the formation of the constricted portion to narrow the width of the fastening strips
Item 7. The sleeve according to item 5 or 6 . 8. the sleeve two sets, one set is slightly larger diameter than that of the other set, claims 1 to 7, characterized by using a slidably telescopic The sleeve according to any one of the above items.