JP2023000040A - Liquid leakage prevention apparatus and flask unit provided with liquid leakage prevention apparatus - Google Patents

Abstract

To provide a liquid leakage prevention apparatus preventing liquid leakage from the inside of a flask, and a flask unit provided with a liquid leakage prevention apparatus.SOLUTION: A liquid leakage prevention apparatus 400 is fitted to a flask 600 to prevent liquid leakage from the inside, and comprises: a bed part 100 fitted to the flask 600 and provided with an insertion hole 120 inserting a steel bar 700 in the flask 600; an enclosure part 200 inserting the steel bar 700 and enclosing the circumference of the steel bar 700; and a fixing part 300 fixing the enclosure part 200 in a state where it is made adjacent to the insertion hole 120 of the bed part 100.SELECTED DRAWING: Figure 7

Description

TECHNICAL FIELD The present invention relates to a liquid leakage prevention device used together with a formwork when manufacturing precast concrete products.

Conventionally, precast concrete products have been manufactured by pouring concrete into a mold and solidifying it, and then taking it out of the mold. In addition, precast concrete products have built-in reinforcing bars that serve as a framework, and in some cases, the reinforcing bars protrude from the surface of the precast concrete product for reasons such as combining with other precast concrete products. When manufacturing a precast concrete product with protruding reinforcing bars, the reinforcing bars protrude outside the formwork, so the formwork is provided with through-holes through which the reinforcing bars pass. However, since there is a slight gap between the through-hole of the formwork and the reinforcing bar, there is a problem that the moisture inside the concrete (so-called slag) leaks out from the gap. .

Therefore, in view of the above problems, the present invention aims to provide a liquid leakage prevention device that prevents liquid leakage from the inside of the formwork, and a mold unit provided with the liquid leakage prevention device.

The liquid leakage prevention device of the present invention is a liquid leakage prevention device that is attached to a formwork to prevent liquid leakage from the inside, and is attached to the formwork and has an insertion hole for inserting a reinforcing bar in the formwork. A base portion, an enclosing portion for inserting the reinforcing bar and enclosing the perimeter of the reinforcing bar, and a fixing portion for fixing the enclosing portion adjacent to the insertion hole of the base portion. and

According to the above feature, the gap between the through-hole and the reinforcing bar is filled by the enclosing part fixed adjacent to the through-hole of the base part, and the liquid leaks to the outside through the gap from the concrete inside the formwork. is prevented.

The liquid leakage prevention device of the present invention is characterized in that the fixing portion is fixed by pressing the surrounding portion toward the insertion hole of the base portion.

According to the above feature, the state in which the gap between the insertion hole and the reinforcing bar is filled by the surrounding portion is more firmly maintained, and the leakage of liquid from the concrete inside the formwork to the outside through the gap is more assured. It is prevented.

In the liquid leakage prevention device of the present invention, the base end of the enclosing portion is arranged inside the insertion hole of the base portion, the fixing portion is attached from the outside of the enclosing portion, and the base end of the fixing portion is , and is fixed by being inserted into the insertion hole from the outside of the proximal end of the surrounding portion.

According to the above feature, the gap between the insertion hole and the reinforcing bar is doubly blocked and filled by the base end of the surrounding portion and the base end of the fixing portion. As a result, the gaps between the insertion holes and the reinforcing bars are more reliably filled, and leakage of liquid from the concrete inside the form to the outside through the gaps is more reliably prevented.

The formwork unit of the present invention is equipped with a liquid leak prevention device.

According to the above feature, it is possible to prevent leakage of liquid from the inside of the mold.

The formwork unit provided with the liquid leakage prevention device of the present invention is characterized in that the base portion is integrated with the formwork as a part of the formwork.

According to the above feature, it is possible to prevent leakage of liquid from the inside of the mold.

As described above, according to the liquid leakage prevention device of the present invention and the mold unit provided with the liquid leakage prevention device, liquid leakage from the inside of the mold can be prevented.

(a) is a plan view of the base portion of the liquid leakage prevention device of the present invention, (b) is a side view of the base portion, and (c) is a sectional view taken along line AA. (a) is a plan view of the enclosing portion of the liquid leakage prevention device of the present invention, (b) is a side view of the enclosing portion, and (c) is a BB cross-sectional view. (a) is a plan view of the fixing portion of the liquid leakage prevention device of the present invention, (b) is a side view of the fixing portion, and (c) is a cross-sectional view taken along line CC. (a) is a perspective view of a mold, and (b) is a side view of the mold. (a) is a perspective view showing an enlarged part of the side surface of the formwork, (b) is a side view showing an enlarged part of the side surface of the formwork, and (c) is DD It is a sectional view. (a) is a perspective view showing an enlarged part of the side surface of the formwork, (b) is a side view showing an enlarged part of the side surface of the formwork, and (c) is EE It is a sectional view. (a) is a perspective view showing an enlarged part of the side surface of the formwork, (b) is a side view showing an enlarged part of the side surface of the formwork, and (c) is F-F It is a sectional view.

100 base portion 120 insertion hole 200 enclosing portion 300 fixing portion 400 liquid leakage prevention device 600 formwork

An embodiment of the present invention will be described below with reference to the drawings. It should be noted that the shapes in the drawings referred to in the following description are conceptual diagrams or schematic diagrams for explaining preferred shapes and dimensions, and the dimensional ratios and the like do not necessarily match the actual dimensional ratios. That is, the present invention is not limited to the dimensional ratios in the drawings.

First, the base portion 100 of the liquid leakage prevention device 400 of the present invention will be described with reference to FIG. 1(a) is a plan view of the base portion 100, FIG. 1(b) is a side view of the base portion 100, and FIG. 1(c) is a sectional view taken along line AA.

As shown in FIG. 1, the base portion 100 has a substantially square main body portion 110, and an insertion hole 120 is formed in the substantially center of the main body portion 110 so as to penetrate vertically. The insertion hole 120 is configured so that a reinforcing bar, which will be described later, can be inserted, and an inner surface 121 of the insertion hole 120 is inclined from the outside toward the inside. In addition, the diameter of the insertion hole 120 is configured to narrow from the outside toward the inside, and the diameter L1 on the outer end 122 side of the insertion hole 120 is larger than the diameter L2 on the inner end 123 side of the insertion hole 120. It's becoming In this way, since the inner surface 121 of the insertion hole 120 is inclined so as to narrow from the outside toward the inside, a part of the enclosing part 200 and the fixing part 300 described later can be moved from the outside to the inside of the insertion hole 120. It is easy to arrange for direct insertion. In addition, the inner end 123 side of the insertion hole 120 has a protruding shape so that it can be inserted into a through hole 621 of the formwork 600 to be described later. Mounting holes 101 used for fixing the base portion 100 to the formwork 600 are formed at the four corners of the base portion 100 .

Further, a claw-shaped engaging portion 130 is provided around the insertion hole 120 so as to protrude outward from the body portion 110 . The engaging portion 130 is used to fix a fixing portion 300 (to be described later) to the base portion 100 . The inner end 123 side of the insertion hole 120 is the side facing the concrete inside the form as described later, and the outer end 122 side of the insertion hole 120 is the opposite side of the inner end 123, which will be described later. This is the side to which the enclosing part 200 and the fixing part 300 are attached. In addition, although the diameter of the insertion hole 120 is configured to narrow from the outside to the inside, the diameter is not limited to this. may be in the shape of

Next, the enclosing part 200 of the liquid leakage prevention device 400 of the present invention will be described with reference to FIG. 2(a) is a plan view of the enclosing part 200, FIG. 2(b) is a side view of the enclosing part 200, and FIG. 2(c) is a cross-sectional view taken along line BB.

As shown in FIG. 2, the enclosing part 200 has a cylindrical shape and is provided with an insertion hole 220 through which a reinforcing bar can be inserted. In addition, the insertion hole 220 has a shape corresponding to the outer shape of the reinforcing bar (for example, the outer diameter of the reinforcing bar if the cross section is circular) so as to surround the reinforcing bar with as little space as possible. Specifically, the insertion hole 220 has a substantially oval shape in plan view, and includes a flat surface 221 and an arcuate surface 222 . Although the insertion hole 220 has a shape corresponding to a reinforcing bar having an approximately oval cross section, the shape of the insertion hole 220 is not limited to this, and the insertion hole 220 may have any shape as long as the circumference of the reinforcing bar can be surrounded as closely as possible. may be For example, if the reinforcing bar has a circular cross section, the insertion hole 220 has a circular shape, and the inner diameter of the insertion hole 220 may be appropriately changed according to the outer diameter of the reinforcing bar having a circular cross section. That is, if the outer diameter of the reinforcing bar is large, the inner diameter of the insertion hole 220 may be increased, and if the outer diameter of the reinforcing bar is small, the inner diameter of the insertion hole 220 may be decreased. Note that even in the case of a reinforcing bar having a substantially oval cross section, the size of the insertion hole 220 may be appropriately changed in accordance with the reinforcing bar.

A portion of the proximal end 202 opposite to the distal end 201 of the enclosing portion 200 forms a collar portion 230 that encircles the insertion hole 220 in the circumferential direction. The flange portion 230 protrudes toward the side of the insertion hole 220 and has an inclined surface 231 on its side surface. In addition, the proximal end 202 is configured to be inserted and arranged inside the insertion hole 120 of the base portion 100 , and the inclined surface 231 of the collar portion 230 is the inner surface 121 of the insertion hole 120 of the base portion 100 . In addition, it is configured to be able to contact with surface contact.

Although the enclosing part 200 has a cylindrical shape, it is not limited to this, and may have an arbitrary shape such as a hollow substantially quadrangular prism shape as long as it can surround the reinforcing bars. Moreover, since the enclosing part 200 is ring-shaped, as will be described later, the enclosing part 200 is attached such that the reinforcing bar is passed through the insertion hole 220 from the tip side thereof, but is not limited to this. For example, an opening or a notch is provided in a part of the side surface of the enclosing part 200 so that the enclosing part 200 opens in a substantially C shape, and the reinforcing bar is inserted into the insertion hole 220 through the opening or the notch in the side surface of the enclosing part 200. You can let it run. In addition, the enclosing part 200 may be vertically divided into two parts, and the paired split pieces of the enclosing part 200 may be attached so as to hug each other around the sides of the reinforcing bars.

Next, the fixing portion 300 of the liquid leakage prevention device 400 of the present invention will be described with reference to FIG. 3(a) is a plan view of the fixing portion 300, FIG. 3(b) is a side view of the fixing portion 300, and FIG. 3(c) is a sectional view taken along the line CC.

As shown in FIG. 3, the fixed part 300 has a cylindrical shape and is provided with an insertion hole 320 having a size into which the surrounding part 200 can be inserted. Moreover, the insertion hole 320 has a shape corresponding to the outer peripheral shape of the enclosing part 200, so that the enclosing part 200 can be surrounded as tightly as possible. Specifically, the insertion hole 320 has a circular shape in a plan view, and is smooth so that the fixing portion 300 can slide around the surrounding portion 200 when the surrounding portion 200 is inserted into the insertion hole 320 . It has a circular inner surface 323 . Although the circular insertion hole 320 has a shape corresponding to the cylindrical enclosing part 200, the insertion hole 320 is not limited to this, as long as the enclosing part 200 can be inserted. It may be in shape.

In addition, an inclined surface 331 is provided at the proximal end 302 of the fixed portion 300 opposite to the distal end 301 so as to encircle the insertion hole 320 in the circumferential direction. The base end 302 side of the fixing portion 300 is configured to be inserted and arranged inside the insertion hole 120 of the base portion 100 , and the inclined surface 331 of the fixing portion 300 is the inner surface of the insertion hole 120 of the base portion 100 . 121 so as to come into surface contact. A flat abutment portion 332 is provided at a position adjacent to the inclined surface 331 on the base end 302 side of the fixing portion 300 . It is adapted to abut against the outer surface 233 .

Further, an engaging portion 340 protruding sideways is provided on a side surface of the fixed portion 300 , and the engaging portion 340 can be engaged with the engaging portion 130 of the base portion 100 . there is An engaging surface 341 of the engaging portion 340 is a portion that contacts and engages with the rear surface of the claw-shaped engaging portion 130 . , in other words, the thickness of the engaging portion 340 is increased. Further, a plurality of unevennesses 350 are provided on the side surface of the fixed part 300, and the unevennesses 350 play a role of anti-slip when a worker handles the fixed part 300, as will be described later.

In addition, although the fixed part 300 has a cylindrical shape, it is not limited to this, and may have an arbitrary shape such as a hollow substantially quadrangular prism. In addition, since the fixed part 300 has an annular shape, the fixed part 300 is attached so that the reinforcing bar and the enclosing part 200 pass through the insertion hole 320 from the tip side thereof, as will be described later. However, the fixing part 300 is not limited thereto. For example, an opening or a notch is provided in a part of the side surface of the fixing part 300 so that the fixing part 300 opens in a substantially C shape, and the reinforcing bar and the surrounding part 200 are inserted through the opening or the notch in the side surface of the fixing part 300. You may make it penetrate through the hole 320. FIG. Alternatively, the fixed part 300 may be vertically divided into two parts, and the paired divided pieces of the fixed part 300 may be attached so as to hug the reinforcing bars and the enclosing part 200 from the periphery.

The base portion 100, the surrounding portion 200, and the fixing portion 300 are made of metal or synthetic resin, but are not limited to this, and can be made of any material as long as it has strength enough to withstand use. .

Next, a method for using the liquid leakage prevention device 400 of the present invention will be described with reference to FIGS. 4 to 7. FIG. 4(a) is a perspective view of the mold 600, and FIG. 4(b) is a side view of the mold 600. As shown in FIG.

The formwork 600 is made of a metal plate, a wooden plate, or the like, and is a hollow, substantially cubic shape with an upper opening. and Concrete is then poured into the formwork 600 from the upper opening, solidified, and then removed from the formwork 600 to complete a precast concrete product. Reinforcing bars 700 forming the skeleton of the precast concrete product protrude from side surfaces 620 of the formwork 600 . Specifically, a circular through-hole 621 is provided in a side surface 620 of the formwork 600, and the reinforcing bar 700 protrudes outward from the through-hole 621. As shown in FIG. The through hole 621 is formed to be larger than the outer circumference of the reinforcing bar 700 in order to allow the reinforcing bar 700 to pass therethrough and to accommodate various types of outer circumferences of the reinforcing bar 700 . Therefore, a gap 622 exists between the through hole 621 and the reinforcing bar 700 . As a result, moisture (so-called slag) inside the concrete poured into the mold 600 may leak to the outside through the gap 622 .

Therefore, in the present invention, as shown in FIGS. 5 to 7, a liquid leakage prevention device 400 is attached to a mold 600 to prevent liquid leakage. The formwork 600 has been conventionally used, and may have any shape and configuration, such as a cylindrical shape, depending on the precast concrete product. In addition, a mounting hole 624 is formed in the side surface 620 of the mold 600 for mounting the base portion 100 of the liquid leakage prevention device 400 (see FIG. 4).

First, as shown in FIG. 5, the base portion 100 of the leak prevention device 400 is attached to the formwork 600 . 5(a) is a perspective view showing an enlarged part of the side surface 620 of the formwork 600, and FIG. 5(b) is an enlarged side view showing a part of the side surface 620 of the formwork 600. FIG. 5(c) is a sectional view taken along the line DD.

As shown in FIG. 5, when mounting the base portion 100 to the side surface 620 of the formwork 600, the mounting hole 101 of the base portion 100 and the mounting hole 624 of the side surface 620 of the formwork 600 are overlapped, and the mounting members 102 such as bolts are attached. The mounting hole 624 and the mounting hole 101 are penetrated and screwed together. Thereby, the base portion 100 is fixed to the formwork 600 . In addition, the inner end 123 side of the insertion hole 120 of the base portion 100 is inserted into the through hole 621 of the side surface 620 of the mold 600 . Therefore, since the insertion hole 120 of the base portion 100 and the through hole 621 of the side surface 620 overlap each other, the reinforcing bar 700 in the formwork 600 is inserted through the through hole 621 of the side surface 620 and the insertion hole 120 of the base portion 100 to protrude to the outside. ing.

Note that the insertion hole 120 of the base portion 100 is formed larger than the outer peripheral shape of the reinforcing bar 700 in order to correspond to the outer peripheral shape of the reinforcing bar 700 of various types. Therefore, the gap 622 around the reinforcing bar 700 is not completely filled with the base portion 100 .

Next, as shown in FIG. 6, the enclosing part 200 of the liquid leakage prevention device 400 is attached to the formwork 600 . 6(a) is a perspective view showing an enlarged part of the side surface 620 of the formwork 600, and FIG. 6(b) is an enlarged side view showing a part of the side surface 620 of the formwork 600. FIG. 6(c) is a cross-sectional view taken along line EE.

As shown in FIG. 6 , the tip 710 of the reinforcing bar 700 is inserted through the insertion hole 220 of the enclosing portion 200 to move the enclosing portion 200 toward the base portion 100 . Then, the surrounding portion 200 is brought into a state adjacent to the insertion hole 120 of the base portion 100 . Then, the gap 622 between the insertion hole 120 and the reinforcing bar 700 is filled by the surrounding portion 200 adjacent to the insertion hole 120 of the base portion 100 . Therefore, as will be described later, leakage of liquid from the concrete inside the formwork 600 to the outside through the gap 622 is prevented.

Further, as shown in FIG. 6C, the proximal end 202 of the surrounding portion 200 is arranged inside the insertion hole 120 of the base portion 100 . Therefore, the gap 622 between the insertion hole 120 and the reinforcing bar 700 is more reliably filled. Furthermore, the inclined surface 231 of the collar portion 230 of the proximal end 202 is in surface contact with the inner surface 121 of the insertion hole 120 of the base portion 100 . Therefore, the gap 622 is more reliably filled without gaps.

Next, as shown in FIG. 7, the fixed part 300 of the liquid leakage prevention device 400 is attached to the formwork 600 . 7(a) is a perspective view showing an enlarged part of the side surface 620 of the formwork 600, and FIG. 7(b) is an enlarged side view showing a part of the side surface 620 of the formwork 600. FIG. 7(c) is a sectional view taken along line FF.

As shown in FIG. 7 , the tip 710 of the reinforcing bar 700 is inserted through the insertion hole 320 of the fixing portion 300 to move the fixing portion 300 toward the base portion 100 . Then, the enclosing part 200 is inserted into the insertion hole 320 of the fixing part 300 and the fixing part 300 is attached from the outside of the enclosing part 200 . At this time, by rotating the fixing portion 300 around the surrounding portion 200 , the engaging portion 340 of the fixing portion 300 engages with the engaging portion 130 of the base portion 100 , and the fixing portion 300 is disengaged from the base portion 100 . fixed to prevent In this way, since the fixing part 300 is rotated around the enclosing part 200 to be fixed, the operator using the liquid leakage prevention device 400 can work intuitively and easily, which is highly convenient.

Since the proximal end 302 of the fixing portion 300 fixed to the base portion 100 is arranged outside the proximal end 202 of the enclosing portion 200, the enclosing portion 200 does not come off to the outside. is fixed adjacent to the insertion hole 120 . Therefore, the gap 622 between the insertion hole 120 and the reinforcing bar 700 is filled by the enclosing part 200 fixed adjacent to the insertion hole 120 of the base part 100 , and the concrete inside the formwork 600 is separated from the outside through the gap 622 . Therefore, it is possible to prevent the liquid from leaking out.

Furthermore, the engaging surface 341 of the engaging portion 340 is inclined so that the height increases along the circumferential direction of the insertion hole 320, in other words, the thickness of the engaging portion 340 increases. (See Figure 3). Therefore, in a state where the engaging portion 340 of the fixing portion 300 is engaged with the engaging portion 130 of the base portion 100, if the fixing portion 300 is strongly rotated along the circumferential direction of the surrounding portion 200, the engaging portion The fixing portion 300 is forced into the insertion hole 120 by the thickness of the fixing portion 340 . As a result, the proximal end 302 of the fixing portion 300 presses the proximal end 202 of the enclosing portion 200 toward the insertion hole 120 from the outside and fixes it. As a result, the state in which the gap 622 between the insertion hole 120 and the reinforcing bar 700 is filled with the enclosing part 200 is more firmly maintained, and leakage of liquid from the concrete inside the formwork 600 to the outside through the gap 622 is prevented. It is more reliably prevented.

Furthermore, as shown in FIG. 7C, the proximal end 302 of the fixing portion 300 is inserted into the insertion hole 120 from the outside of the proximal end 202 of the surrounding portion 200 and fixed. Therefore, the base end 202 of the enclosing part 200 and the base end 302 of the fixing part 300 are arranged in the insertion hole 120 so that the base end 202 of the enclosing part 200 and the base end 302 of the fixing part 300 overlap, and the gap 622 between the insertion hole 120 and the reinforcing bar 700 is the The proximal end 202 and the proximal end 302 of the fixing portion 300 are doubly blocked and buried. As a result, the gap 622 between the insertion hole 120 and the reinforcing bar 700 is more reliably filled, and liquid leakage from the concrete inside the formwork 600 to the outside through the gap 622 is more reliably prevented. be.

Furthermore, since the fixing portion 300 is fixed to the base portion 100 in a state in which the contact portion 332 of the base end 302 of the fixing portion 300 is in contact with the outer surface 233 of the flange portion 230 of the enclosing portion 200, the enclosing portion 200 is The inclined surface 231 of the collar portion 230 of the proximal end 202 is maintained in surface contact with the inner surface 121 of the insertion hole 120 of the base portion 100 more firmly, and the gap 622 is more reliably filled without any gap. Furthermore, since the inclined surface 331 of the proximal end 302 of the fixing portion 300 is also in surface contact with the inner surface 121 of the insertion hole 120 of the base portion 100, the gap 622 is more reliably filled without any gap.

Note that the fixing portion 300 is configured to be fixed to the base portion 100 in a state in which the enclosing portion 200 is inserted through the insertion hole 320 , but is not limited to this. Any configuration may be used as long as it can be fixed in an adjacent state. For example, the fixing part 300 may have a configuration such as a rubber band that is wound around the surrounding part 200 and attached, and that can be fixed to the base part 100 as well.

Further, the fixing portion 300 presses and fixes the surrounding portion 200 toward the insertion hole 120 by engaging the engaging portion 340 of the fixing portion 300 and the engaging portion 130 of the base portion 100, but is limited to this. However, if the fixing part 300 can be fixed by pressing the surrounding part 200 toward the insertion hole 120, for example, a part of the fixing part 300 is fixed by tightening a part of the base part 100 with a screw. Any configuration can be adopted, such as configuration. Although the fixing portion 300 is fixed by pressing the surrounding portion 200 toward the insertion hole 120 , the fixing portion 300 is not limited to this. The fixing part 300 does not have to press the surrounding part 200 toward the insertion hole 120 as long as the fixing part 300 can be fixed to the insertion hole 120 .

1 to 7, the liquid leakage prevention device 400 is composed of a base portion 100, an enclosing portion 200, and a fixing portion 300, and the liquid leakage prevention device 400 is retrofitted to the existing mold 600. is used as However, other than this embodiment, a formwork unit including the leak prevention device 400 and the formwork 600 may be used. Furthermore, the base part 100 of the liquid leakage prevention device 400 may be integrated with a part of the mold 600 as a part of the mold 600 (for example, the side surface 620). Specifically, the formwork unit does not include a plate-like base section 100 separate from a part of the formwork 600 (for example, the side surface 620), and each element of the base section 100 (for example, the insertion hole 120 and the engagement hole). joint 130, etc.) resides directly on a portion of formwork 600 (eg, side 620).

It should be noted that the liquid leakage prevention device and the formwork unit provided with the liquid leakage prevention device of the present invention are not limited to the above-described embodiments, and various modifications can be made within the scope of the claims and the embodiments. Modifications and combinations are possible, and these modifications and combinations are also included in the scope of rights.

Claims (5)

A liquid leakage prevention device that is attached to a formwork to prevent liquid leakage from the inside,
a base portion attached to the formwork and provided with an insertion hole through which the reinforcing bars in the formwork are inserted;
An enclosing portion that surrounds the periphery of the reinforcing bar while allowing the reinforcing bar to pass therethrough;
and a fixing portion that fixes the enclosing portion in a state of being adjacent to the insertion hole of the base portion.
2. The liquid leakage prevention device according to claim 1, wherein the fixing portion is fixed by pressing the surrounding portion toward the insertion hole of the base portion.
a proximal end of the surrounding portion is disposed inside the insertion hole of the base portion;
The fixing part is attached from the outside of the enclosing part,
3. The liquid leakage prevention device according to claim 1, wherein the proximal end of the fixing portion is inserted into the insertion hole from the outside of the proximal end of the surrounding portion and fixed.
A formwork unit comprising the liquid leakage prevention device according to any one of claims 1 to 3.
The formwork unit according to claim 4, wherein the base part is integral with the formwork as part of the formwork.

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