JP2008273037A - Seal body for placing concrete - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure reliable sealing performance of a penetration part in a seal body for placing concrete for sealing the penetration part of reinforcing steel to a form member (10) for placing concrete. <P>SOLUTION: The seal body for placing concrete is equipped with a pair of seal blocks (20), (20) for clamping and pressing the reinforcing steel (11) from the radial direction, each seal block (20) is equipped with a soft sponge body (21) pressed to the reinforcing steel (11) from the radial direction and a hard sponge body (22) attached to the soft sponge body (21) in a laminated state from the perpendicular direction with respect to the pressing direction and the extending direction of the reinforcing steel (11). In such a state that the reinforcing steel (11) is clamped and pressed by each seal block (20), the hard sponge body (20) laminated on the soft sponge body (21) to be pressed protrudes from the reinforcing steel (11) to the laminated direction while the soft sponge body (21) is pressed to the reinforcing steel (11). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a concrete placing sealing body for preventing uncured concrete from leaking from a penetration portion of a reinforcing bar with respect to a formwork material.

FIG. 6 is a cross-sectional view of a main part of a conventional example for explaining the work of placing concrete (K) using the formwork material (10).
In this conventional one, a rebar insertion hole (12) is formed in the formwork material (10), and when placing concrete, the tip of the rebar (11) placed in the formwork material (10) ( 110) is protruded to the outside from the reinforcing bar insertion hole (12), and then the concrete (K) is poured into the mold material (10) and waits until it is cured. Then, if the formwork (10) is appropriately disassembled after the concrete (K) is hardened, a slab concrete floor slab, a wall body and the like are completed.
JP 10-34630 A

  However, in the above-described conventional one, when the pitch of the reinforcing bars (11) and (11) penetrating the formwork material (10) is changed, a new mold in which reinforcing bar insertion holes (12) and (12) are formed in accordance with the pitch. It is necessary to remanufacture the frame material (10), and the versatility of the mold frame material (10) is poor.

  Therefore, as shown in FIGS. 7 and 8, a large rebar insertion hole (12) through which the rebar (11) can be inserted with a margin is formed in the formwork (10), and the rebar (11) is rebar insertion hole (12 It is also conceivable that the portion protruding from the outside to the outside is clamped by the sponge seal blocks (15) and (16) from the radial direction. In this way, since a large gap is formed between the peripheral edge of the reinforcing bar insertion hole (12) and the reinforcing bar (11), changes in the pitch of the reinforcing bars (11) and (11) can be absorbed by the gap. As a result, a versatile mold material (10) that can be applied even when the pitch of the reinforcing bars (11) (11) changes is obtained.

  However, as shown in FIGS. 7 and 8, if each of the seal blocks (15) and (16) is an integral molded product of a sponge, the joints and reinforcing bars (15) are formed by the elasticity of the seal blocks (15) and (16). 11) A relatively large gap (S) (S) is formed at the boundary portion, resulting in poor sealing performance, and there is a concern that uncured concrete (K) may leak from the gap (S) (S). was there.

The present invention has been made in view of such points.
In `` Concrete placing seal body that seals the penetration part of the reinforcing bar to the formwork material (10) for placing concrete '', it is an object to be able to ensure a reliable sealing performance of the penetration part To do.

[Invention of Claim 1]
The solution means of the invention according to claim 1 for solving the above-mentioned problem is as follows:
`` Comprising a pair of seal blocks (20) (20) for pinching the rebar (11) from the radial direction at the portion to be sealed,
Each seal block (20)
A soft sponge body (21) pressed from the radial direction to the rebar (11),
The soft sponge body (21) is bonded to at least one surface in a laminated state from a direction perpendicular to the pressing direction and the direction in which the reinforcing bar (11) extends, and is formed of a hard material from the soft sponge body (21). A hard sponge body (22),
In a state in which the reinforcing bar (11) is clamped by the seal blocks (20), the soft sponge body (21) is pressed against the reinforcing bar (11), while the pressed soft sponge body (21) The laminated hard sponge body (22) protrudes from the reinforcing bar (11) in the laminating direction.
Next, the operation of the present invention will be described with reference to FIG.
When the concrete placing seal body of the present invention is used, as shown in FIG. 3, the soft sponge body (21) provided in each of the pair of seal blocks (20) is pressed against the side surface of the reinforcing bar (11). As described above, the reinforcing bars (11) are pinched by the seal blocks (20) and (20). In this pinched state, the hard sponge body (22) laminated on the soft sponge body (21) protrudes from the reinforcing bar (11) in the lamination direction (end part (220) in FIG. 3).

  The soft sponge body (21) is compressed in accordance with the clamping pressure, and the soft sponge body (21) pulls the hard sponge body (22) in the compression direction F2 via the adhesive layer (23). As a result, the end (220) of the hard sponge body (22) on the reinforcing bar (11) side receives a force deformed in the direction F3 to be wound around the soft sponge body (21), and the reinforcing bar (22) of the hard sponge body (22) ( The end portion (220) on the 11) side can easily approach or closely contact the surface of the reinforcing bar (11). Therefore, a large gap (S) as shown in FIG. 7 does not occur at the boundary between the joint portion of each seal block (20) (20) and the reinforcing bar (11).

Further, since the hard sponge body (22) is made of a harder material than the soft sponge body (21), the end portions (220) and (220) have a large force to protrude in the direction opposite to the compression direction F2. The ends (220) and (220) of the hard sponge bodies (22) and (22) in the seal blocks (20) and (20) are in reliable contact with each other. Therefore, also from this point, a large gap (S) as shown in FIG. 7 is unlikely to occur at the boundary between the joint portion of each seal block (20) (20) and the reinforcing bar (11).
From these things, the reliable sealing performance of the penetration part of the reinforcing bar (11) with respect to a formwork material (10) is securable.

[Invention of Claim 2]
In the invention according to claim 1,
In the `` the hard sponge body (22) (22) is adhered in a laminated state on both front and back surfaces in the stacking direction of the soft sponge body (21) '', the reinforcing bars (11 ), The ends (220) and (220) of the hard sponge bodies (22) and (22) adhered to the front and back surfaces of the soft sponge body (21) approach or closely contact the surface of the reinforcing bar (11). .

[Invention of Claim 3]
In the invention according to claim 2,
“The thickness of the soft sponge body (21) in the stacking direction is set to a dimension equal to or smaller than the diameter of the reinforcing bar (11)”.
In this case, it was confirmed that the gap corresponding to the gap (S) in FIG. 7 generated at the boundary between the joints of the seal blocks (20) and (20) and the reinforcing bars (11) was extremely small.

[Invention of Claim 4]
In the invention according to claim 2 or 3,
“A plurality of layers of the soft sponge body (21)” can be applied to a structure in which a plurality of reinforcing bars (11) and (11) penetrate the formwork material (10). That is, since each seal block (20) has a plurality of layers of soft sponge bodies (21), these soft sponge bodies (21) can be pressed against the reinforcing bars (11) and (11) separately. Therefore, even in a structure in which a plurality of reinforcing bars (11) and (11) pass through the mold material (10), these can be clamped by a pair of seal blocks (20) and (20) to ensure a sealed state. .

The present invention has the following specific effects.
According to the invention of claim 1, as described above, the end (220) on the reinforcing bar (11) side of the hard sponge body (22) laminated on the soft sponge body (21) is the reinforcing bar (11). Easy to approach or adhere to the surface. Further, the end portion (220) of the hard sponge body (22) has a large force protruding in the direction opposite to the pressure contact direction F2 of the soft sponge body (21), and the hard sponge body in the seal blocks (20) and (20). The ends (220) and (220) of the bodies (22) and (22) are in reliable contact with each other. Therefore, the boundary between the joint of each seal block (20) and (20) and the reinforcing bar (11) is shown in FIG. A large gap (S) as shown is less likely to occur. From these things, the reliable sealing performance of the penetration part of the reinforcing bar (11) with respect to a formwork material (10) is securable.

  In the invention according to claim 2, as described above, when the reinforcing bar (11) is clamped by the seal blocks (20) and (20), both hard sponge bodies bonded to both the front and back surfaces of the soft sponge body (21). (22) The end portions (220) and (220) of (22) approach or closely contact the surface of the reinforcing bar (11).

  In the invention according to claim 3, as described above, the one corresponding to the gap (S) in FIG. 7 generated at the boundary between the joint portion of the seal block (20) (20) and the reinforcing bar (11) becomes extremely small.

  According to the invention of claim 4, the plurality of soft sponge bodies (21) provided in each seal block (20) can be press-contacted to the reinforcing bars (11) and (11) separately. The present invention can also be applied to a structure in which a plurality of reinforcing bars (11) and (11) penetrate through 10).

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view of a concrete placing seal body according to an embodiment of the present invention, FIG. 2 is a schematic perspective view of a use state, and FIG. 3 is a concrete placement seal body sandwiching a reinforcing bar (11). It is the elements on larger scale of the state pressed.
As shown in FIG. 1, a concrete placing seal body (2) according to an embodiment of the present invention includes a pair of seal blocks (20) and (20) that sandwich a reinforcing bar (11) and (11) from the radial direction. It is configured.

  Each of the seal blocks (20) and (20) has the same structure, and a plurality of soft sponge bodies (21) and (21) whose front surface (210) is pressed against the reinforcing bar (11) from the radial direction, and the soft blocks It is composed of hard sponge bodies (22) and (22) which are formed of a hard material from the sponge bodies (21) and (21) and are bonded in a laminated state to these front and back, and a soft sponge body (21) and a hard sponge body ( At the boundary of 22), an adhesive layer (23) in which the adhesive is cured is formed. The soft sponge body (21) and the hard sponge body (22) are formed of closed cell foamed urethane.

  The soft sponge body (21) and the hard sponge body (22) are laminated in the direction F1 in which the reinforcing bar (11) is pressed by the seal blocks (20) and (20) and the direction in which the reinforcing bar (11) extends (in FIG. 1). And the direction Y perpendicular to the paper surface). The thickness t1 of the soft sponge body (21) in the stacking direction is set slightly smaller than the diameter L of the reinforcing bar (11) (provided that the thickness t1 is the same as or slightly smaller than the diameter of the reinforcing bar (11)). Larger dimensions may be set.) If the thickness t1 of the soft sponge body (21) is set to be equal to or smaller than the diameter of the reinforcing bar (11), it will occur at the boundary between the joint of each seal block (20) (20) and the reinforcing bar (11) when used later. It was confirmed that the one corresponding to the gap (S) in FIG.

  When placing concrete, as shown in FIG. 2, the frame materials (10) and (10) are assembled in a rectangular frame shape on the upper surface of the bottom plate (17), and the rebar ( 11) A car (19) in which (11) is combined in a three-dimensional grid is positioned in the formwork materials (10) and (10). Then, the ends (110) and (110) of the reinforcing bars (11) and (11) protrude outside from the rectangular reinforcing bar insertion holes (18) provided in the pair of opposite formwork members (10) and (10). Let

  Next, the front surface (210) of the soft sponge body (21) (21) of the seal block (20) (20) overlaid on the mounting plate (31) (31) is pressed against the side surface of the reinforcing bar (11). In addition, the reinforcing bar (11) is clamped between the seal blocks (20) and (20).

  Then, each soft sponge body (21) is compressed along with the clamping pressure, and as shown in FIG. 3, the soft sponge body (21) is hard sponge through the adhesive layer (23) on the front and back sides thereof. Pull the body (22) in the compression direction F2. As a result, the end portions (220) and (220) of the hard sponge bodies (22) and (22) receive a force that is deformed in the direction F3 to be wound around the soft sponge body (21), and the hard sponge bodies (22) The end portions (220) and (220) are easily adhered to the surface of the reinforcing bar (11).

Further, in the sandwiched state, the end portions (220) and (220) of both hard sponge bodies (22) and (22) laminated on the front and back of the soft sponge body (21) are stacked in the stacking direction (diameter from the reinforcing bars (11)). The outer end of the hard sponge body (22) of one of the seal blocks (20), and the protruding end (220) (220) of the other sponge block (20). The ends (220) and (220) of the hard sponge body (22) are pressed against each other in the compression direction F2. Since the hard sponge body (22) is formed of a harder material than the soft sponge body (21), the force with which the protruding portions (a) and (a) are pressed against each other is the entire seal block (20). Is larger than that formed integrally with a soft sponge body.
For these reasons, a large gap (S) as shown in FIG. 7 does not occur at the boundary between the joints of the seal blocks (20) and (20) and the reinforcing bars (11).

  After clamping the reinforcing bars (11) and (11) with the seal blocks (20) and (20) in this way, tighten them to the bolt insertion notches (32) and (32) formed on the mounting plates (31) and (31). Bolts (40) and (40) are inserted, and tightening nuts (41) and (41) are screwed to the tips of the bolts and tightened. In this state, each seal block (20) (20) is in close contact with the outer surface (100) of the formwork member (10), and seals the penetration part of the reinforcing bar (11) in the reinforcing bar insertion hole (18). It has become. Thereafter, the concrete is poured into the inside of the mold materials (10) and (10) assembled in a rectangular frame shape and left to stand until it is cured. In this case, as described above, a large gap (S) as shown in FIG. 7 does not occur at the boundary between the joint portion of each seal block (20) (20) and the reinforcing bar (11). Concrete can be reliably prevented from flowing out from the boundary between the seal blocks (20), (20) and the reinforcing bars (11). A release agent is applied in advance to the surfaces of the seal blocks (20) and (20) that come into contact with the concrete.

  Then, after the poured concrete has hardened, the fastening bolts (40) (40) are loosened to disassemble the concrete placing seal body (2), and the mold materials (10) (10) are appropriately disassembled. As shown in Fig. 4, the precast plate (A) with the reinforcing bars (11) and (11) protruding on the side of the hardened concrete (K) is completed and transported from the factory to the building site etc. To construct the floors and walls of structures and buildings.

In the above embodiment, the reinforcing bars (11) are clamped by bringing the opposed seal blocks (20), (20) close to each other, but the seal blocks (20), (20) are pressed in advance, and then Alternatively, the tip of the reinforcing bar (11) may be press-fitted into the boundary between the soft sponge bodies (21) and (21). In this case, as shown in FIG. 5, it is preferable to form a tapered recess (50) in a portion where the soft sponge body (21) and the hard sponge body (22) face the tip of the reinforcing bar (11). According to this configuration, the tip (110) of the reinforcing bar (11) is aligned with the tapered recess (50) located at the boundary between the sealed seal blocks (20) and (20), and then the reinforcing bar (11) 3 is press-fitted into the seal blocks (20) and (20), the seal state shown in FIG. 3 is obtained in which the reinforcing bars (11) are clamped by the concrete placing seal body (2).
In the above embodiment, the concrete placing sealing body of the present invention has been described by way of example in which concrete is placed using a circular cross-section reinforcing bar (11). The present invention can also be applied to the case where concrete is placed using the reinforcing bars (11) having the same.

Further, as indicated by an imaginary line in FIG. 3, a pair of hard sponges (23a) and (23a) made of the same material as the hard sponge body (23) may be embedded in the soft sponge body (21).
Furthermore, in FIG. 3, when it is only necessary to ensure the sealing property only on the upper side of the reinforcing bar (11), only the upper surface of the soft sponge body (21) that presses the reinforcing bar (11) is the hard sponge body (21). May be bonded in a laminated state. That is, in the present invention, it is only necessary that the soft sponge body (21) is bonded to at least one surface in a laminated state.

Sectional drawing of the sealing body (2) for concrete placement which concerns on embodiment of this invention Schematic perspective view of the use state of the concrete placing seal body (2) according to the embodiment of the present invention Partial enlarged view of the state where the reinforcing bar (11) is clamped Perspective view of pre-cact plate (A) The principal part perspective view explaining the modification of the sealing body (2) for concrete placement Illustration of conventional example Explanatory drawing of improvement plan of conventional example Explanatory drawing of improvement plan of conventional example

Explanation of symbols

(10) ・ ・ ・ Form material
(11) ・ ・ ・ Reinforcing bar
(20) ・ ・ ・ Seal block
(21) ・ ・ ・ Soft sponge body
(22) ・ ・ ・ Hard sponge body

Claims (4)

In the concrete casting sealing body for sealing the penetration part of the reinforcing bar to the formwork material (10) for casting concrete,
A pair of seal blocks (20) and (20) that clamp the rebar (11) from the radial direction at the portion to be sealed,
Each seal block (20)
A soft sponge body (21) pressed from the radial direction to the rebar (11),
The soft sponge body (21) is bonded to at least one surface in a laminated state from a direction perpendicular to the pressing direction and the direction in which the reinforcing bar (11) extends, and is formed of a hard material from the soft sponge body (21). A hard sponge body (22),
In a state in which the reinforcing bar (11) is clamped by the seal blocks (20), the soft sponge body (21) is pressed against the reinforcing bar (11), while the pressed soft sponge body (21) A concrete placing sealing body in which the laminated hard sponge body (22) protrudes from the reinforcing bars (11) in the laminating direction. In the concrete placing sealing body according to claim 1,
A concrete placing sealing body in which the hard sponge body (22) is bonded in a laminated state to both front and back surfaces of the soft sponge body (21) in the laminating direction. In the concrete placing sealing body according to claim 2,
The concrete placing seal body, wherein the thickness of the soft sponge body (21) in the stacking direction is set to a dimension equal to or less than the diameter of the reinforcing bar (11). In the concrete placing sealing body according to claim 2 or claim 3,
A sealing body for placing concrete, wherein a plurality of layers of the soft sponge body (21) are present.

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