JP2013036184A - Hollow form and method for producing concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable easy checking of concrete filling conditions in the lower part of a hollow form without forming a through-hole, a window part and others in the hollow form.SOLUTION: A belt-like steel plate in which a recessed groove-shaped rib 2 for reinforcement is formed in a longitudinal direction is wound in a shape of spiral cylinder, and both ends of the cylindrical shape is blocked by a cover plate 4 so as to form a hollow form body 3. Tubular members 6 are installed from the upper part to the lower part of the hollow form body 3 to be along the rib 2 for reinforcement. The bottom edge of the tubular member 6 is located immediately below a hollow form 1. Concrete C is placed in a form 8 for concrete placing to reach the lower part of the hollow form 1 and a gauge 10 is inserted in the tubular member 6 so that a butt plate 13 of the gauge 10 butts against the upper opening of the tubular member 6. Next, the gauge 10 is pulled out and it is checked whether the concrete C is stuck to a predetermined position of an insertion part 12. From right/wrong of the quality of the adhesion state, filling conditions of the concrete C in the lower part of the hollow form 1 can be easily checked.

Description

  The present invention relates to a hollow mold for forming a hollow portion inside a concrete structure, and a method for producing a concrete structure using the hollow mold.

  As a method for forming a hollow portion inside a concrete structure such as a concrete floor board and reducing the weight of the concrete structure, for example, as shown in Patent Document 1, a hollow mold is provided in a concrete casting mold. Is fixed, and concrete is placed in the mold to embed the hollow mold. According to this method, since the hollow part (cavity part) into which concrete does not enter is formed inside the concrete structure, the weight of the concrete structure can be reduced by the amount of the hollow part.

  When placing the concrete, it is difficult to check whether the concrete is filled under the hollow formwork. This is because the lower side of this hollow mold cannot be directly visually confirmed. Therefore, a foamed resin embedding material having through holes formed in the vertical direction shown in Patent Document 2 and a hollow mold frame having windows formed in the upper and lower directions shown in Patent Document 3 are fixed in the concrete casting mold. However, through this through hole or window portion, the filling state of the embedding material or the concrete under the hollow mold may be visually confirmed.

JP 2002-138665 A JP 2001-3506 A JP 2011-94337 A

  The structure in which a through hole is formed in the embedding material or the window part is formed in the hollow frame is troublesome to form, and it is necessary to reinforce the periphery of the through hole and the window part There is a risk of increasing costs.

  Then, this invention makes it a subject to make it easy to confirm the concrete filling condition of the lower side of this hollow mold, without forming a through-hole, a window part, etc. in a hollow mold.

  In order to solve the above-described problems, the present invention provides a hollow mold used when forming a hollow portion into which a cast concrete does not enter inside a concrete structure. A hollow mold was configured by providing a tubular member for inserting a gauge for checking the filling state of the concrete, which opened along the lower side of the hollow mold main body and opened along the lower side.

  By inserting a gauge into this tubular member and confirming the state of filling of the concrete below the hollow mold, there is no need to form a through hole or a window in the hollow mold. For this reason, the effort which forms a through-hole etc. or reinforces the circumference | surroundings is not required. It is most preferable that the lower opening of this tubular member is directly under the hollow formwork where the filling state is to be confirmed, but considering the flow direction of the placed concrete and the shape of the formwork, the position of the opening Can be appropriately changed.

  Further, the position of the upper end of the tubular member is not particularly limited, but at least when checking the state of filling concrete, it is necessary that the opening of the upper end is not buried in the placed concrete. If the opening at the upper end is buried in the concrete during this check, the concrete will adhere to the gauge when the gauge is pulled out, regardless of the filling condition at the lower end of the tubular member. This is because it cannot be accurately grasped.

  The tubular member is not particularly limited as long as it can smoothly insert and remove the gauge, but it is particularly preferable to use a grout hose used in placing concrete. This grout hose is strong enough to withstand high pressure, and is difficult to deform even when external force is applied when placing concrete, and its inner surface is smooth, allowing the gauge to be inserted and removed smoothly. Because.

  Here, the “hollow part” refers to a part that is not filled with concrete by placing, and includes not only a hollow part but also a part occupied by a foaming resin that is lighter than concrete.

  Moreover, in the said structure, the said hollow mold main body winds the strip | belt-shaped steel plate in which the groove | channel for the groove-shaped reinforcement rib was formed in the longitudinal direction to the spiral cylinder shape, Comprising: This hollow mold frame It can be set as the structure by which the both ends of a main body are obstruct | occluded with a cover board and the said tubular member is provided so that the said rib for reinforcement may be followed.

  When a tubular member is provided along the reinforcing rib, the tubular member is locked to the reinforcing rib even when a casting pressure is applied to the tubular member when placing concrete. Difficult to shift from the outer wall of the main unit. For this reason, it is possible to always accurately grasp the concrete filling state.

  Moreover, in each said structure, the opening of the lower end side of the said tubular member can be made to face perpendicular | vertical downward.

  If the opening on the lower end side of this tubular member is in the horizontal direction, the concrete adheres to the gauge between when the cast concrete flows toward the opening at the lower end and when it flows in the opposite direction. Differences in ease of use may occur. Therefore, when the lower end opening of the tubular member is directed downward as described above, it is difficult to be influenced by the flow direction of the placed concrete, and the quality of the concrete filling condition can be accurately grasped.

  When the lower end opening is directed vertically downward, an L-shaped bend member can be used at the lower end of the tubular member, or the tubular member itself can be bent by providing a bend jig near the lower end portion. .

  The present invention provides a tubular member extending along the outer wall of the hollow mold body without forming a through hole or a window for confirming the state of filling of the concrete below the hollow mold frame in the hollow mold body. A gauge was inserted into the tubular member, and the quality of the filling state was judged from the state of adhesion of concrete to the gauge. If it does in this way, the filling condition of the concrete to the lower side of a hollow formwork can be grasped | ascertained easily.

Side view showing a first embodiment of a hollow mold according to the present invention Sectional drawing which follows the II-II line in FIG. Side view of essential parts showing a state in which the tubular member is provided on the reinforcing rib Front view showing the lower end of the tubular member Front view showing a gauge inserted into a tubular member Side view showing a second embodiment of the hollow mold according to the present invention Sectional view showing the concrete placing process in the mold with the hollow mold fixed

  A first embodiment of a hollow mold 1 according to the present invention is shown in FIGS. In this hollow mold 1, a strip-shaped steel plate having a groove-shaped reinforcing rib 2 formed in the longitudinal direction is wound in a spiral cylindrical shape to form a hollow mold main body 3, and both ends of the cylindrical shape are closed with lid plates 4. Is. As shown in FIG. 3, both sides of the strip-shaped steel plate are firmly connected by caulking treatment so that the placed concrete C does not enter the hollow mold 1. In FIG. 1, the reinforcing rib 2 and the caulking portion 5 are not shown in order to prevent the drawing from being complicated.

  A plurality of tubular members 6 are fixed to the hollow frame body 3 by fasteners 7 along the reinforcing ribs 2 on the outer wall from the upper side to the lower side. The upper end of the tubular member 6 is positioned directly above the hollow mold 1 and the lower end is positioned directly below the hollow mold 1. As shown in FIG. 1, it is preferable to arrange a plurality of tubular members 6 at regular intervals (for example, every 120 cm) with their upper and lower ends oriented in a predetermined direction. 8, the shape of the hollow mold 1, the flow direction of the concrete C in the mold 8, and the like can be appropriately changed in consideration of various factors such as the number and arrangement of the tubular members 6 and the positions of the upper and lower ends. .

  As shown in FIG. 4, tubular bend portions 9 bent 90 degrees in the middle are connected to the upper and lower ends of the tubular member 6. Since the tip of the bend portion 9 provided at the lower end faces downward, it is difficult to be influenced by the flow direction of the placed concrete C, and the filling state can be confirmed accurately. Further, since the tip of the bend portion 9 provided at the upper end is directed upward, the gauge 10 can be smoothly inserted and removed from the upper side of the mold 8.

  Instead of connecting the bend portions 9, a bend jig that bends the upper and lower ends of the tubular member 6 in the vertical direction may be used. When this bend jig is used, there is no step on the inner surface of the tubular member 6 unlike when the bend portion 9 is connected, so that the gauge 10 can be inserted and removed more smoothly.

  As this tubular member 6, for example, a grout hose used when placing concrete C or the like can be used. This grout hose has sufficient elasticity to be provided (wound) along the hollow mold body 3 and strength sufficient to prevent deformation by the casting pressure of the concrete C. Moreover, since the inner surface is smooth, the gauge 10 can be inserted and removed smoothly. Of course, other tubular members 6 can be used as long as they have a function equivalent to this grout hose.

  As shown in FIG. 5, the gauge 10 to be inserted into the tubular member 6 includes a handle portion 11, an insertion portion 12, and a butting plate 13. The insertion portion 12 of the gauge 10 is inserted from the upper end opening of the tubular member 6. The material of the insertion portion 12 can be appropriately selected from a slightly curved thin steel plate or steel wire, a highly elastic resin wire, or the like. Thus, by using a material that has a certain degree of rigidity and can be bent freely, the inside of the tubular member 6 can be smoothly passed.

  When the butting plate 13 is inserted until it hits the upper end opening of the tubular member 6, the distal end of the inserting portion 12 contacts the lower opening of the tubular member 6 and the bottom surface of the concrete casting form 8. The length of the insertion portion 12 is determined so as to reach a desired position such as a position. By providing the abutting plate 13, the gauge 10 can be inserted to a predetermined position determined in advance.

  Furthermore, the filling condition of the concrete C on the lower side of the hollow mold 1 can be quantitatively evaluated by giving a scale to the insertion portion 12 and reading the adhesion amount of the concrete C to the scale. .

  A second embodiment of the hollow mold 1 according to the present invention is shown in FIG. This hollow mold 1 has basically the same configuration as the hollow mold 1 shown in FIG. 1, but is not formed with a concave groove-shaped reinforcing rib 2 and is along the outer wall of the hollow mold body 3. Thus, it is different in that a plurality of tubular members 6 are provided in the shortest path from the upper side to the lower side. Also in this configuration, the concrete wraparound on the lower side of the hollow mold 1 can be easily confirmed as in the hollow mold 1 shown in FIG.

  A method for manufacturing a concrete structure using the hollow mold 1 will be described.

  The hollow mold 1 shown in FIG. 1 or the like is fixed to a predetermined position in the concrete casting mold 8 by using a fixing member 14 and reaches the lower part of the hollow mold 1 as shown in FIG. Until this time, the concrete C is placed in the mold 8. Then, the gauge 10 is inserted into the tubular member 6 of the hollow mold 1 until the butting plate 13 hits the upper opening of the tubular member 6. Next, the gauge 10 is pulled out, and it is confirmed whether or not the concrete C adheres to a predetermined position of the insertion portion 12. In the case where a plurality of tubular members 6 are provided, the adhesion state of the concrete C is similarly confirmed for the gauges 10 inserted into the tubular members 6.

  When the concrete C is sufficiently adhered to the insertion portion 12 of each gauge 10, it is determined that the concrete C is well filled on the lower side of the hollow mold 1, and the concrete C is further added to a predetermined amount. To cast.

  On the other hand, if the amount of concrete C adhering to the insertion portion 12 of each gauge 10 is insufficient, it is determined that the concrete C filling state on the lower side of the hollow mold 1 is insufficient, and the hollow A vibrator (not shown) is inserted from the side of the mold 1 and the concrete C near the lower side of the hollow mold 1 is vibrated. Due to this vibration, the fluidity of the concrete C is increased, and the concrete C is quickly filled in the insufficiently filled portion. Thereafter, the concrete C is placed up to a specified amount in the same manner as described above. And after the cast concrete C hardens | cures, the formwork 8 is removed and a concrete structure is completed.

  In each of the above embodiments, the hollow mold 1 has a cylindrical shape. However, this shape is not limited to this, and a rectangular tube shape corresponding to the shape of the concrete casting mold 8 is used. Various shapes such as a cube, a rectangular parallelepiped, and a sphere can be appropriately employed. Furthermore, not only the hollow mold 1 having a hollow inside but also a solid member such as a foamed resin can be appropriately employed.

DESCRIPTION OF SYMBOLS 1 Hollow mold frame 2 Reinforcing rib 3 Hollow mold frame main body 4 Lid plate 5 Clamping part 6 Tubular member 7 Fastener 8 Mold frame 9 Bend part 10 Gauge part 11 Insert part 13 Butting board 14 Fixing member C concrete

Claims (4)

In the hollow mold used when forming the hollow part into which the placed concrete (C) does not enter, inside the concrete structure,
A gauge for checking the state of filling of the concrete (C) that opens along the hollow mold main body (3) from the upper side to the lower side of the outer wall and opens below the hollow mold main body (3). A hollow mold provided with a tubular member (6) for insertion.   The hollow mold body (3) is a tubular body formed by winding a strip-shaped steel plate having a concave groove-shaped reinforcing rib (2) in the longitudinal direction into a spiral cylindrical shape. The hollow mold according to claim 1, wherein both ends of (3) are closed with a lid plate (4), and the tubular member (6) is provided along the reinforcing rib (2).   The hollow mold according to claim 1 or 2, wherein an opening on a lower end side of the tubular member (6) is directed vertically downward. A hollow mold (1) that forms a hollow portion into which the cast concrete (C) does not enter is fixed at a predetermined position in the concrete mold (8), and the concrete is placed in the mold (8). In the method for producing a concrete structure in which (C) is placed and the hollow mold (1) is embedded,
The said hollow mold (1) is the hollow mold (1) as described in any one of Claims 1-3, Comprising: In the case of the placement operation | work of the said concrete (C), the said tubular member (6) The gauge (10) inserted into the gauge (10) is pulled out as appropriate, and the state of filling of the concrete (C) on the lower side of the hollow mold (1) is confirmed from the state of adhesion of the concrete (C) to the tip of the gauge (10). A method for producing a concrete structure.

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