JP2603582B2 - Weir board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weir plate, and more particularly to a weir plate suitable for a movable formwork used for construction of a tall structure and lining of a tunnel.

[0002]

2. Description of the Related Art Conventionally, as a dam for a movable mold, a face plate provided with a hole penetrating from one surface to the other surface that defines a concrete casting space and the one surface is covered with a layer made of a porous material. Those having the following were used.

[0003]

According to this dam plate, water and air in the cast concrete in contact with the porous material layer flow out to the other surface of the face plate through the porous material layer and the holes. Therefore, a concrete molding surface having high strength and high quality, which does not have junkers or the like, can be obtained. By the way, if the porous material layer covering the face plate of the weir plate is clogged with cement particles or fine aggregate during use of the movable formwork, the amount of water or air passing through the layer is limited. . Therefore, it is desirable to replace the clogged porous material layer with a new one. However, replacing the porous material layer requires dismantling of the mold and assembling the mold using a new face plate, and these operations require a great deal of labor and time. Therefore, the present invention
It is an object of the present invention to provide a weir plate that can be replaced with a porous material used for removing water and air in concrete without dismantling a movable formwork.

[0004]

Means for Solving the Problems, Functions and Effects of the Invention
The present invention provides a porous material having a face plate provided with a hole and defining one surface defining a concrete casting space, and a fitting portion disposed on the other side of the face plate and fitted to the hole of the face plate. And a holding means disposed on the other side of the face plate for releasably holding the porous member on the face plate. According to the present invention, the water and the air in the cast concrete are guided to the outside of the concrete casting space via the fitting portion of the porous member that is in contact with the cast concrete. Since the porous member is disposed on the other surface side of the face plate, that is, on the side opposite to the concrete casting space, and is held releasably by holding means, the porous member can be easily and at any time, Moreover, the mold can be replaced without dismantling.

It is desirable to provide a hollow portion in the porous member. According to this, the time required for air and water to pass through the porous member is shorter than that having no hollow portion.

[0006] The holding means includes an abutting member abutting on the porous member and at least one movably supported by the face plate for releasably pressing the abutting member toward the porous member. And two pressing members. According to this, the porous member can be firmly held on the face plate by the pressing of the pressing member, and the pressing of the contact member by the pressing member is released,
By removing the contact member, the porous member can be removed from the face plate.

[0007] The holding means may comprise a pressing member which is swingably supported on the face plate and is releasably fixed and presses the porous member toward the face plate. According to this, by fixing the pressing member to the face plate, it is possible to hold the porous member to the face plate, and by releasing the fixing of the pressing member and swinging it, The holding of the porous member can be released.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, there is shown in cross-section a cylindrical mobile formwork 10 used to form a cast-in-place concrete lining in a tunnel. Mobile formwork 1
Numeral 0 is supported in the tunnel so as to be movable in the axial direction thereof, and defines a concrete placing space between the tunnel and the wall surface of the tunnel.

The illustrated movable mold 10 includes a top foam part 12, a pair of side foam parts 14 pivotally attached to circumferential ends of the top foam part, and both side foam parts 14.
Is provided with a pair of invert foam parts 16 respectively pivotally attached to the circumferential ends of the invert foam parts. The water and air oozing out of the concrete poured into the casting space, particularly the concrete below the invert foam part 16, rises along the peripheral surface of the invert foam part 16 and stays near the lower end of the side foam part 14. I do. In order to remove the stagnant water and air, each side foam portion 14 is constituted by a weir plate according to the present invention. The present invention can be applied to each inverted foam part 16 instead of being applied to each side foam part 14 or together with each side foam 14. The present invention can also be applied to other movable molds for constructing tall structures such as chimneys and silos, molds other than the movable molds, and the like.

The weir plate includes a face plate 18, a porous member 20 made of a porous material, and holding means 22 for holding the porous member 20 on the face plate 18. An elongated hole 24 extending in the longitudinal direction (the axial direction of the movable mold 10) is formed in the face plate 18.
(See FIG. 2). The hole 24 is open to one surface (outer surface) 18a that comes into contact with the concrete and another surface 18b facing the one surface. The hole 24 has a plurality of elongated holes extending in the axial direction, one or a plurality of elongated holes extending in the circumferential direction, the axial direction or It may be a plurality of point-like holes arranged in the circumferential direction.
Further, the face plate may be a flat plate according to a molding object.

As shown in FIG. 3, the porous member 20 is arranged on the other surface 18b of the face plate 18. Porous member 2
Reference numeral 0 includes a fitting portion 26 that fits into the hole 24 of the face plate and has an outer shape substantially matching the shape of the hole 24. The illustrated porous member 20 has a convex cross-sectional shape, and the large width base 28 connected to the small width fitting portion 26 is connected to the other surface 18b of the face plate.
Is in contact with Needless to say, in the case of a plurality of holes, point-like holes, or the like, a porous member having a fitting portion of a number and shape corresponding to the number and shape of the holes is used.
A hollow part 30 is provided in the porous member 20. The illustrated hollow portion 30 has a rectangular cross-sectional shape, extends in the longitudinal direction, and is open at both ends in the longitudinal direction (see FIG. 2). The cross-sectional shape of the hollow portion can be set to a polygon other than a rectangle, a circle, or the like. The hollow portion 30 is made of the porous member 2
Shorter travel paths for air and water passing through zero are described below, thus reducing the time required for passage.

The porous member 20 prevents passage of the concrete and allows passage of air and water oozing out of the concrete. As an example of the porous material constituting the porous member 20, a synthetic resin or metal powder is sintered, and preferably has a pore diameter of 0.1 mm or less and 30 to
Some materials have a porosity of 50%. In addition to the sintered material, a material made of felt, a material obtained by bundling a number of long fibers, and the like can be used. The air and water are supplied from one surface 18a of the face plate 18 through the porous member 20 to the other surface 18a.
It is led to the side of b. This eliminates stagnation of air and water near the lower part of the side foam part 14,
The generation of irregular surfaces such as junka on the concrete surface is prevented, and a high-strength and high-quality concrete surface can be obtained.

During use of the movable form 10, the porous member 2
When the passage rate of the air or water is reduced due to the fine cement particles or aggregate powder clogged with zero, the holding of the porous member 20 by the holding means 22 is released and the porous member 20 is removed from the face plate 18. Thereafter, a new porous member is installed, and this is held on the face plate 18 by the holding means 22. Thereby, the replacement of the porous member can be performed. The holding means 22 is, like the porous member 20, provided with the other surface 18b of the face plate 18.
, That is, on the side opposite to the concrete casting space, the work of replacing the porous member can be performed while the movable formwork 10 is in use.

Referring to FIG. 3, the holding means 22 includes a contact member 32 abutting on the top surface of the base 28 of the porous member 20.
And a plurality of pressing members 34 movably supported by the face plate 18 and releasably pressing the contact member 32 toward the porous member 20.

The illustrated abutment member 32 has a rectangular cross-sectional shape and has a greater length and width than the porous member 20. Each pressing member 34 is formed of a wedge member. The wedge members 34 are arranged on both sides of the porous member 20 and are fixed to the other surface 18 b of the face plate and supported by the face plate 18 via a pair of reinforcing ribs 36 extending in the longitudinal direction of the face plate 18.
Each of the reinforcing ribs 36 is provided with an insertion hole 38 for each wedge member 34 at an interval in the longitudinal direction. Since each insertion hole 38 has a hole edge at a position lower than the top surface of the contact member 32 (a position close to the face plate 18), both holes 38
When the amount of insertion of each of the wedge members 34 is increased, the contact member 32 is pressed toward the porous member 20 by the wedge action, and the base 28 of the porous member 20 is pressed against the face plate 18. Thereby, the porous member 20 is
8 firmly held. The porous member 20 includes the respective wedge members 3.
By pulling out 4 from the insertion hole 38, the holding state can be released. In the illustrated example, a plurality of holes 40 are provided in each of the reinforcing ribs 36 in order to eliminate water that has accumulated between the reinforcing ribs 36 via the porous member 20.

Referring to FIGS. 4 and 5, in this example, the top 42 of the base 28 of the porous member 20 is formed in a dish shape. The contact member 32 has a groove 44 that engages with the dish-shaped top 42 of the porous member 20 and has a dish-shaped cross section. Further, a plurality of (two in the illustrated example) pressing members 34
Are arranged in the longitudinal direction. Each pressing member 34 is provided with a groove 46 that engages with the dish-shaped abutting member 32 and has a contact member 3.
2, a pair of protrusions 50 provided at each end of the body 48 and extending in a direction crossing the body.
And

On the other hand, a pair of mutually opposing grooves 52 are formed in the pair of reinforcing ribs 36 and extend substantially in an L-shape to receive each pair of protrusions 50. More precisely, each groove 52 is not a complete L-shape, but comprises a portion extending vertically in the drawing and a portion extending obliquely downward. Each pressing member 34
L of two pairs of grooves 52 for receiving two pairs of protrusions 50
The other side of the shape extends in the same direction.

When the projecting portion 50 received in the vertical portion of the groove 52 is moved obliquely downward, the contact member 32 receives a pressing force from the main body 48 of the pressing member by a wedge action.
As a result, the porous member 20 is pressed against the face plate 18,
It is kept in this. By moving the protrusion 50 of the pressing member 34 in the opposite direction, that is, obliquely upward, the holding of the porous member 20 on the face plate 18 is released. Porous member 20
After being removed from the face plate 18, it can be slid in the longitudinal direction with respect to the contact member 32 to release the engagement with the contact member 32. The plurality of pressing members 34 can be a single member if necessary.

As shown in FIGS. 6 and 7, the holding means 22 can be constituted solely by a pressing member 32 supported swingably on the face plate 18. The pressing member 32 includes a main body 54 having a rectangular cross-sectional shape and a length and a width larger than those of the porous member 20, and a pair of pins 56 traversing and penetrating both ends of the main body 54. Each pin 56 is inserted through a pair of holes 58 provided in both reinforcing ribs 36. When one of the pins 56 (left in the illustrated example) forms a swing axis of the main body 54 and the other (right) pin 56 passes through both holes 58, the main body 54 connects the porous member 20. This is pressed against the face plate 18 and held. On the other hand, the other pin 56 is pulled out from both holes 58 and the main body 54 is pulled out.
Is swung in the direction of the arrow, the holding of the porous member 20 is released. Thereafter, the porous member 20 can be taken out from the face plate 18.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a movable formwork for tunnel lining having a side foam portion to which the present invention is applied.

FIG. 2 is a longitudinal sectional view of a side foam part.

FIG. 3 is an enlarged cross-sectional view of the holding means.

FIG. 4 is a plan view of a side foam part of another example.

FIG. 5 is an enlarged cross-sectional view of another example of the holding means.

FIG. 6 is a longitudinal sectional view of another example of a side foam part.

FIG. 7 is an enlarged cross-sectional view of another example of the holding means.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Movable formwork 14 Side foam part (dam board) 18 Face plate 20 Porous member 22 Holding means 24 Hole 26 Porous member fitting part

Claims (4)

(57) [Claims] 1. A porous material having a face plate provided with a hole and having one surface defining a concrete casting space, and a fitting portion disposed on the other surface side of the face plate and fitted in the hole of the face plate. A damper plate comprising: a porous member made of: and holding means disposed on the other side of the face plate for releasably holding the porous member to the face plate. 2. The weir plate according to claim 1, wherein said porous member has a hollow portion. 3. A holding member, wherein said holding means is movably supported by said face plate and said contact member is in contact with said porous member, and at least one presses said contact member releasably toward said porous member. The weir plate according to claim 1, comprising two pressing members. 4. The holding means comprises a pressing member, which is swingably supported by the face plate and releasably fixed, presses the porous member toward the face plate.
The weir plate according to the above.