JP2747437B2 - Sleeve for forming through hole and method for forming through hole - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a through-hole forming sleeve and a through-hole forming method used for forming a through-hole for piping in a beam or a wall at the time of placing concrete in the construction of a reinforced concrete building.

[0002]

2. Description of the Related Art Conventional sleeves for forming through holes include:
There is a sleeve described in JP-A-58-164860.

[0003] The sleeve has a left and right center sleeve.
A pair of side sleeves are screwed together so as to have opposite threads, and the center sleeve is rotated with respect to the side sleeves, so that the entire sleeve expands and contracts by a turnbuckle method.

The sleeves are inserted into the beam form in a contracted state, and are extended by rotating the center sleeve with respect to the side sleeves so that the end face of each side sleeve is pressed against the inner face of the form. .

[0005]

In the conventional sleeve of the above-mentioned turnbuckle type, the operator has to insert his / her hand into the form to rotate the center sleeve. Is not good.

In particular, when a beam and a slab or the like are integrally cast in concrete, the width of the upper surface opening of the beam formwork is
Usually, since it is formed narrower than the distance between the inner surfaces of the mold,
The labor required for the work of elongating in the mold increases.

Further, in the pre-assembly method in which a pre-assembled reinforcing bar assembly is inserted into a pre-assembled formwork, the sleeve is inserted into the formwork with the sleeve mounted on the reinforcing bar assembly. Even if an attempt is made to perform the extension operation, the main bars and the band bars of the reinforcing bar assembly become obstructive, and the work efficiency is further reduced.

[0008] Therefore, after the rebar assembly is inserted, the operation for extending the sleeve to a predetermined length requires more time and labor.

[0009]

SUMMARY OF THE INVENTION The present invention provides a sleeve for forming a through hole,
It is to improve the work efficiency in the field by making it possible to easily press the inner surface of the formwork in the formwork, and in particular, to insert the pre-assembled rebar assembly into the formwork after assembling the formwork. An object of the present invention is to provide a sleeve for forming a through-hole and a method for forming a through-hole which are advantageous in an assembling method.

[0010]

According to the first aspect of the present invention,
A spring-type urging mechanism that can be extended and contracted in the sleeve length direction is housed in a sleeve outer body in which the inner and outer sleeve members are slidably fitted to each other in the length direction, and the spring-type urging mechanism includes: A lock mechanism is provided to lock this in a compressed state. Both ends of the spring-type urging mechanism are detachably connected to each sleeve member, and the operating portion of the lock mechanism can be released from outside the sleeve outer body. The sleeve for forming a through hole is characterized in that the sleeve is positioned at an appropriate position.

According to a second aspect of the present invention, a spring-type urging mechanism that can be extended and contracted in the length direction of the sleeve is freely taken out of the sleeve outer body in which the inner and outer sleeve members are slidably fitted to each other in the length direction. The spring-type urging mechanism is provided with a locking mechanism for locking the same in a compressed state. A bottomed guide having a length longer than the expansion / contraction stroke of the spring-type urging mechanism is provided at both ends of the spring-type urging mechanism. A cover, wherein the guide cover is slidably fitted to the inner periphery of the sleeve member, and the operating portion of the lock mechanism is located at a position where the operating portion can be released from outside the sleeve outer body. Is a sleeve for forming a through hole.

According to a third aspect of the present invention, a spring-type urging mechanism that can be extended and contracted in the length direction of the sleeve is freely detachable from the inside of the sleeve outer body in which the inner and outer sleeve members are slidably fitted in the length direction. The through-hole forming sleeve, which is housed and the operating part of the lock mechanism is located at a position where the operating part of the locking mechanism can be released from the outside of the sleeve outer body, is compressed and locked at a predetermined position of the rebar assembly and the sleeve length Slidably mounted, insert the above-mentioned rebar assembly into the top open form, release the lock mechanism from outside the form, and extend the spring-type urging mechanism to form the form. The sleeve is pressed against both sides and both ends in the longitudinal direction of the sleeve are pressed against both sides of the formwork. After the concrete is cast, the sleeve is left in the concrete, and the spring-type biasing mechanism is removed from the inside of the spring shell. Outside It is through hole forming method according to claim.

[0013]

A reinforcing bar assembly is assembled from a beam main reinforcing bar and a band reinforcing bar for binding the reinforcing bars separately from a concrete casting formwork, and a sleeve for forming a through-hole is provided at a predetermined position of the reinforcing bar assembly. It is slidably supported in the longitudinal direction.

The rebar assembly provided with the sleeve in the compressed state is inserted into the form from the upper end opening surface, and the lock mechanism is released from the outside. Then, the spring biasing mechanism is extended. In the sleeve according to the first aspect, the sleeve outer body is also extended together with the spring-type urging mechanism and pressed against the inner surface of the mold. In the sleeve according to the second aspect, the spring-type urging mechanism is extended and pressed against the inner surface of the form, and then the sleeve outer body is extended and pressed against the inner surface of the form.

When the concrete is poured and the hardening is completed, the form is disassembled, and the spring-type biasing mechanism is removed from the sleeve shell and used again. The sleeve shell remains in the beam and forms the inner wall of the through hole.

[0016]

FIG. 1 is a longitudinal sectional view of a sleeve for forming a through hole to which the invention of claim 1 of the present invention is applied. An outer sleeve member 1 and an inner sleeve member 2 are slidable in the longitudinal direction with respect to each other. The fitting forms a sleeve outer body 3 that can expand and contract in the length direction as a whole. Both sleeve members 1 and 2 are made of resin or metal plate.

In the sleeve outer body 3, an outer cylinder case 5,
A spring-type urging mechanism 10 including an inner cylinder case 6, a piston-type absorber 7, a coil spring 8, and the like is housed. The ends of the two cases 5, 6 are connected to the case lid via joint pipes 11, 12, respectively. 13 and 14 are screwed.

The piston type absorber 7 is arranged at the shaft core portions in the cases 5 and 6 so as to be able to expand and contract in the axial direction.
The left end of the outer sleeve member 1 is connected to the outer case lid 13 by a nut 16 and fixed to the guide cover 18 by a nut 20. The guide cover 18 is slidable in the axial direction on the inner peripheral surface of the outer sleeve member 1. Mated.

The right end of the cylinder portion 7a of the absorber 7 is connected to the inner cylinder case cover 14 by a nut 17, and a guide cover 19 is fixed by a nut 21. The guide cover 19 is formed inside the inner sleeve member 2. It is fitted on the peripheral surface slidably in the axial direction.

The coil spring 8 is contracted between the inner cylinder case cover 14 and a ring-shaped spring receiver 26 fixed to the outer cylinder case 5, and connects the two cylinder cases 5 and 6 to each other in the axial direction. It is biased in the separating direction.

As a lock mechanism, a lock lever 30 is rotatably supported via a support pin 29 on a bracket 28 provided inside the left end of the outer cylinder case 5.
At the right end of the lock lever 30, an engagement portion 30a that is bent outward in the radial direction is formed, and the engagement portion 30a
The lock holes 31 formed on the left end of the inner cylinder case 6 and the lock holes 32 formed on the outer cylinder case 5 are engaged with each other, whereby the two cases 5 and 6 are contracted (spring compressed state).
I keep it.

The left end operation portion 30b of the lock lever 30
It passes through the slit 33 of the outer cylinder case lid 13 and the slit 34 of the guide lid 18 and extends outside the guide lid, is operable from the outside, and is provided on the nut 20 for fixing the lid to hold the lever. It is held by a clamp 36. By pulling up the operation portion 30b, the engagement portion 30a
Are removed from both locking holes 31 and 32, and both cases 5, 6 are removed.
Can be unlocked.

At the left end of the inner cylinder case 6, for example, four spline grooves 38 having a length equal to or longer than the sleeve expansion / contraction stroke are formed.
As shown in FIG. 7, the spring is engaged with four mounting rods 27 provided on the spring receiver 26. The engagement between the rod 27 and the spline groove 38 prevents rotation between the two cases 5 and 6 and regulates the maximum contraction amount.

In FIG. 2, the clamp 36 is constituted by a bifurcated arc-shaped leaf spring member, and
Is held in the locked position, and the lock lever operating portion 30b is pulled upward with a certain force from the locked state, whereby the lock lever operating portion 30b can be removed upward against the elastic force of the clamp 36.

The connection between the guide cover 18 and the outer sleeve member 1 is made detachable by a wire 42. That is, a pair of wire insertion holes 41 is provided at the end of the sleeve member 1.
Are formed, and the guide cover 1
8 are engaged. Both ends of the wire 42 are appropriately bent.

The guide cover 19 on the right side of FIG. 1 is engaged with the wire 42 in the same structure as the guide cover 18 on the left side.

[0027]

In FIG. 4, the form P for beams is assembled integrally with the frame plate S for slab thereon, and the width W1 of the upper end opening P1 of the form P for beams is shown. Is smaller than the distance W2 (for example, 600 mm) between the inner surfaces of the mold P, and is formed to be about W1 = 550 mm.

Apart from the formwork P, a reinforcing bar assembly T is assembled from a beam main reinforcing bar 43 and a band reinforcing bar 44 that binds them together. At a predetermined position of the reinforcing bar assembly T, as shown in FIG. A sleeve locked in a compressed state is arranged, and a reinforcing hole 45 stretched in a diamond shape as shown in FIG. 2 supports the through hole forming sleeve slidably in the sleeve length direction.

As shown in FIG. 4, a reinforcing bar assembly T having a sleeve in a compressed state is inserted into a mold P from an upper end opening P1, and end plates at both ends in the longitudinal direction of the mold (not shown). ) To be fixed at a predetermined position.

Next, a hand or an appropriate stick is inserted into the operating portion 30b of the lock lever 30 from the upper end opening P1.
Is pulled upward to release the lock between the two cases 5, 6. Then, as shown in FIG. 5, the spring biasing mechanism 10 is extended by the restoring force of the coil spring 8, and the guide cover 1
The sleeve outer body 3 is extended via the wires 8, 19 and the left and right wires 42 and pressed against the inner surface of the form P.

After the concrete is cast and the hardening is completed, the form is dismantled. During the casting, both end surfaces of the sleeve are pressed against the inner surface of the formwork and are closed by the guide lids 18 and 19, so that there is no danger of concrete slag or the like entering the sleeve.

After the mold is disassembled, the left and right wires 42 are pulled out with pliers or the like, and the entire spring type urging mechanism 10 is taken out of the sleeve outer body 3 and used again. On the other hand, the sleeve outer body 3 remains in the beam and becomes the inner wall of the through hole.

[0033]

Second Embodiment FIG. 6 shows a through hole forming sleeve to which the invention of claim 2 is applied, in which a guide rod 50 and a locking pin 51 are used as a lock mechanism. The left and right guide lids 18 and 19 are formed integrally with the case lids 13 and 14, respectively, and a guide rod 50 is provided on the right end of the inner cylinder case 6.
The guide rod 50 extends leftward on the axis, penetrates through the case cover 13 and the guide cover 18 at the left end, protrudes leftward, and inserts the pin 51 into the pin hole 52 at the tip. , The spring biasing mechanism 10 is maintained in a compressed state. Length L3 of the cylindrical portion of both guide lids 18, 19
Are set longer than the telescopic strokes.

The length L1 of the inner sleeve 2 of the sleeve outer body 3 is set to a length (for example, 500 mm) substantially corresponding to the length of the spring-type urging mechanism 10 in a compressed state. Is set to a length (L2) sufficiently longer than the expansion / contraction stroke.

Prior to insertion into the mold P, the spring type urging mechanism 10 is locked in a compressed state by the pin 51 inserted into the rod 50. The inner sleeve 2 and the outer sleeve 1 are set at positions as shown in FIG.

After assembling the sleeve into a rebar assembly (not shown) and inserting it into a mold P, the upper end ring 5
7a, the spring-type urging mechanism 10 is extended by the restoring force of the coil spring 8 as shown in FIG.
Abuts the inner surface of the Thereafter, as shown in FIG. 8, the inner and outer sleeves 2 and 1 are moved to make contact with the left and right inner surfaces.

Then, concrete is poured and after hardening,
The spring-type urging mechanism 10 is pulled out together with the left and right guide lids 18 and 19, leaving only the sleeve outer body 3 as the inner wall of the through hole as shown in FIG.

[0038]

As described above, according to the present invention, (1) Since the sleeve outer body 3 and the spring-type urging mechanism 10 for urging the sleeve outer body 3 in the extending direction are configured to be expandable and contractible,
The sleeve can be easily inserted into the mold P whose opening surface is narrower than the gap between the inner surfaces of the mold, and the spring-type urging mechanism 10 can be easily released by simply releasing the lock mechanism at a predetermined position in the mold.
Alternatively, since the sleeve outer body 3 automatically extends and comes into contact with the inner surface, there is no need to extend the sleeve by a rotating operation or the like, which improves the efficiency of sleeve installation work on site.

(2) After the concrete has been cast, the sleeve outer body 3 which remains in the concrete and forms the inner surface of the through hole
Since the spring-type urging mechanism 10 is formed separately and the spring-type urging mechanism 10 can be extracted, the inner surface is finished by extracting only the spring-type urging mechanism 10 after forming the through hole. While the through hole can be formed, the spring biasing mechanism 10 can be reused and is economical.

(3) In the pre-assembly method in which the assembled reinforcing bar assembly is inserted into the already assembled forming frame, a sleeve is set on the reinforcing bar assembly, and the sleeve is set together with the reinforcing bar assembly in the forming frame. When inserted, the operation of the spring-type biasing mechanism makes it easier to release the lock mechanism, compared to the conventional work that requires inserting the hand into the rebar assembly and rotating the sleeve. The sleeve can be set, which is convenient in the pre-assembly method.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a sleeve for forming a through hole to which the invention described in claim 1 of the present application is applied.

FIG. 2 is a view taken in the direction of the arrow II in FIG.

FIG. 3 is a sectional view taken along line III-III of FIG.

FIG. 4 is a longitudinal sectional view when the method according to claim 3 is performed using the sleeve of FIG. 1;

5 is a longitudinal sectional view showing a state where the lock is released from the state of FIG. 4;

FIG. 6 is a longitudinal sectional view showing a compressed state of a sleeve for forming a through hole to which the invention described in claim 2 is applied.

FIG. 7 is a longitudinal sectional view showing a state when the lock of the sleeve of FIG. 6 is released.

8 is a longitudinal sectional view showing a state when the setting of the sleeve in FIG. 6 is completed.

9 is a longitudinal sectional view showing a state after the spring-type urging mechanism of the sleeve of FIG. 6 is extracted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer sleeve member 2 Inner sleeve member 3 Sleeve outer body 10 Spring-type urging mechanism 18, 19 Guide cover 30 Lock lever (lock mechanism) 30b Operation part 50, 51 Rod, pin (lock mechanism)

Claims (3)

(57) [Claims] 1. A spring-type biasing mechanism which is extendable and contractible in the length direction of a sleeve is removably housed in a sleeve outer body in which inner and outer sleeve members are slidably fitted to each other in the length direction. The biasing mechanism is provided with a lock mechanism for locking the biasing mechanism in a compressed state, and both ends of the spring-type biasing mechanism are detachably connected to the respective sleeve members. A sleeve for forming a through hole, wherein the sleeve is located at a position where it can be released from one side. 2. A spring-type biasing mechanism that is extendable and contractible in the length direction of the sleeve is housed in a sleeve outer body in which inner and outer sleeve members are slidably fitted to each other in the longitudinal direction. The biasing mechanism is provided with a lock mechanism that locks it in a compressed state, and at both ends of the spring-type biasing mechanism,
A guide cover with a bottom longer than the expansion and contraction stroke of the spring-type urging mechanism is provided. The guide cover is slidably fitted on the inner periphery of the sleeve member. A sleeve for forming a through hole, wherein the sleeve is located at a position where it can be released from one side. 3. A spring-type biasing mechanism which is extendable and contractable in the length direction of the sleeve is housed in a sleeve outer body in which inner and outer sleeve members are slidably fitted to each other in the longitudinal direction, and the lock mechanism is provided. A through-hole forming sleeve, in which the operating portion is positioned at a position where it can be released from the outside of the sleeve outer body, is attached to a predetermined position of the reinforcing bar assembly in a compressed state and slidably in the sleeve length direction. By inserting the rebar assembly into a mold having an open top surface and releasing the lock mechanism from outside the mold, the spring-type urging mechanism is extended to press against both side surfaces of the mold and to attach the sleeve. A through-hole characterized in that both ends in the longitudinal direction of the member are pressed against both sides of the formwork, the concrete is poured, the sleeve member is left in the concrete, and the spring-type biasing mechanism is removed from the inside of the spring shell. form Method.