Slab thickness control method and column member

Abstract

To provide a slab thickness control method or the like, which is capable of controlling slab thickness reliably in a simple manner.SOLUTION: In a joint structure used at a building construction site, a column 1 is arranged vertically, and a beam 3 is arranged horizontally relative to the column 1. A diaphragm 7 is joined to the end of the column 1, and the beam 3 is joined to the diaphragm 7. A mark 5 is provided on the surface of the column 1, which allows a specified distance from the diaphragm 7 to be ascertained. The mark 5 is composed of a scale that allows the distance from the beam 3 (diaphragm 7) to be ascertained. That is, the scale makes it possible to ascertain the slab thickness, as described herein.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a method for controlling slab thickness, which enables reliable control of slab thickness at a construction site. [Background technology]

[0002] In construction site structures of reinforced concrete buildings, deck plates are used that serve as both the formwork and the structure for the concrete floor slab. Reinforcement bars are placed on the deck plate and concrete is poured to a specified thickness to form the floor slab.

[0003] The thickness of the slab must be constructed to a specified thickness relative to the design value, and there is an allowable error for the thickness. Therefore, at the construction site, the slab thickness is inspected and managed to be within the specified range relative to the design.

[0004] In order to check whether the slab thickness is within the tolerance, it is necessary to measure the thickness of the slab after the concrete is poured. Usually, the thickness of concrete is measured by directly measuring the distance from the top to the bottom at the ends of the object, but after concrete is poured over the entire surface of the floor, the side ends of the slab are not exposed, making it difficult to measure the thickness of the slab directly.

[0005] Because it is difficult to directly measure the thickness of a slab after the concrete has been poured, other possible methods include drilling holes in the slab and measuring the cross-sectional dimensions of the slab, measuring with an ultrasonic measuring device, or indirectly measuring the dimensions by shifting the measurement points.

[0006] However, drilling holes with a drill or other tool not only requires the time and effort of drilling holes, but also requires the time and effort of filling the holes after measuring the slab thickness. In addition, measurement using an ultrasonic measuring device requires accurate knowledge of the sound velocity of the concrete used in the slab, which is difficult to obtain on-site, prone to measurement errors, and difficult to achieve measurement accuracy of one millimeter. In addition, the method of indirectly measuring the slab thickness by replacing the measurement point is prone to measurement errors that accumulate when replacing the concrete, and the reproducibility of the measurement value is low.

[0007] In response to this, a method has been proposed in which a tool known as a top point (top level control tool) is installed on the deck plate to control the slab thickness when pouring concrete (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2015-132134 A Summary of the Invention [Problem to be solved by the invention]

[0009] This jig comes in various forms, but for example, it has a thin, whisker-like antenna attached to the tip of a thin rod-like member, and the length of the rod-like part can be adjusted. The length of the rod-like part is adjusted to match the slab thickness, and it is installed on the formwork surface of the slab concrete. When pouring concrete, the concrete is poured so that only the whisker-like antenna part is exposed above the concrete surface, allowing the slab thickness to be determined.

[0010] However, if the length of the rod-shaped member of the jig is adjusted incorrectly during installation, the slab thickness will not be the specified thickness, and it will be impossible to know that the thickness is incorrect. Also, if a builder at the site ignores the design value and intentionally adjusts the length of the rod-shaped member to a length different from the design value, it is possible to mistakenly believe that the slab thickness after pouring matches the design value at first glance.

[0011] In this way, coupled with the difficulty of directly measuring the slab thickness in the first place, management of the slab thickness itself was neglected, which resulted in problems such as poor construction. Furthermore, there was a risk that the delayed discovery of such poor construction would lead to a larger problem.

[0012] The present invention has been made in consideration of such problems, and has an object to provide a slab thickness control method etc. that enables the thickness of a slab to be controlled reliably in a simple manner. [Means for solving the problem]

[0013] In order to achieve the above-mentioned object, the first invention is a method for managing slab thickness at a building construction site having columns, beams arranged horizontally to the columns, a deck plate arranged above the beams, and a concrete slab poured above the deck plate, characterized in that the thickness of the slab can be managed by marks provided on the surfaces of the columns.

[0014] The mark may be a scale that allows the distance from the beam to be grasped, and the scale may allow the thickness of the slab to be grasped.

[0015] The mark may be formed on the surface of the pillar by engraving or painting.

[0016] The mark may be formed by a sticker attached to the surface of the pillar.

[0017] In this case, the sticker may be a security tape, and when peeled off, a mark may remain on the pillar.

[0018] According to the first invention, since a mark that allows a predetermined slab thickness to be grasped is provided on the surface of the pillar, there is no need to use a jig or the like. In addition, since the slab thickness can be grasped by the pillar after pouring the concrete, there is no need to measure the thickness. In addition, since the mark is provided directly on the pillar, it is possible to suppress mistakes in setting the thickness and malicious tampering.

[0019] Furthermore, if the mark is a scale, it is possible to grasp the actual thickness of the slab from the scale.

[0020] Such marks can be applied to the pillars by painting or stamping, so that the marks can be easily applied in advance at the factory.

[0021] The mark may also be formed as a sticker. In this way, the mark can be easily attached to the pillar. In this case, if the sticker is a security sticker, a mark will be left when it is peeled off, which can prevent tampering.

[0022] The second invention is a column member for a joint structure used at a construction site, characterized in that a diaphragm is joined to the end of the column and a mark is provided on the surface of the column that allows the user to determine a specified distance from the diaphragm.

[0023] According to the second invention, the column components can be marked in advance when they are manufactured at the factory, eliminating the need for work at the construction site and making it easy to know whether the slab thickness is within the specified range. Effect of the Invention

[0024] According to the present invention, it is possible to provide a slab thickness control method etc. that can reliably control the thickness of a slab in a simple manner. [Brief description of the drawings]

[0025] [Figure 1] FIG. 2 is a perspective view showing the arrangement of columns 1 and beams 3. [Diagram 2] An enlarged perspective view of pillar 1. [Diagram 3] 1A is a diagram showing a state in which a deck plate 9 is placed on a beam 3, and FIG. 1B is a diagram showing a state in which concrete has been poured onto the deck plate 9. FIG. [Figure 4] FIG. 2 is a perspective view showing the state in which the slab 11 has been constructed. [Diagram 5] A diagram showing the condition before and after pouring concrete. [Figure 6] 13A is a diagram showing the mark 5a, and FIG. 13B is a diagram showing the mark 5b. [Figure 7] 5A is a diagram showing the mark 5c made with a sticker, and FIG. 5B is a diagram showing the mark 5c after the sticker has been removed. [Figure 8] A diagram showing another use of Mark 5. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] Hereinafter, a method for managing slab thickness at a construction site according to an embodiment of the present invention will be described. Fig. 1 is a schematic diagram showing a column 1 and a beam 3 at a construction site, and Fig. 2 is an enlarged view of the vicinity of the joint between the column 1 and the beam 3. In the illustrated example, the column 1 is a square steel pipe, but it may be an H-beam.

[0027] In a joint structure used at a construction site, a column 1 is arranged vertically, and a beam 3 is arranged horizontally relative to the column 1. A diaphragm 7 is joined to the end of the column 1, and the beam 3 is joined to a pair of diaphragms 7 that are fixed to sandwich the column 1. The column 1 and the diaphragms 7 (simply referred to as column members in this invention) are joined in advance at a factory, and then joined to other columns 1 and beams 3 on-site.

[0028] In the column member, a mark 5 is provided on the surface of the column 1, which allows a predetermined distance from the diaphragm 7 to be ascertained. In the illustrated example, the mark 5 is composed of a scale that allows the distance from the beam 3 (diaphragm 7) to be ascertained. In other words, the scale makes it possible to ascertain the thickness of the slab, which will be described later. The mark 5 is formed, for example, by engraving or painting on the surface of the column 1, but in order to prevent tampering, it is preferable to use a method that forms an uneven shape, such as an engraving, so that it is difficult to erase or re-form from the surface of the column 1.

[0029] The marks 5 may be provided on all four faces (four faces) of the pillar 1, but may be formed on at least one face. The scale may also include a numerical value indicating the distance from the beam 3 (diaphragm 7).

[0030] When constructing a floor slab, first, a deck plate 9 is placed on top of the beams 3 as shown in Fig. 3(a). The deck plate 9 has an uneven shape, for example a corrugated (rectangular wave) cross section. Reinforcing bars (not shown) are placed integrally or separately on the deck plate 9. In addition, shear connectors and the like are joined above the beams 3 as necessary.

[0031] After the deck plate 9 is installed on the entire surface, as shown in Fig. 3(b), concrete is poured onto the deck plate 9 to construct a slab 11. Fig. 4 is a perspective view showing the state in which the slab 11 has been constructed, and Fig. 5 is a view showing the state of the slab 11 before and after construction.

[0032] As described above, after the slab 11 is constructed over the entire surface, it is difficult to directly measure the thickness of the end of the slab 11. In contrast, in this embodiment, a part of the mark 5 is exposed above the slab 11, so that even after the slab 11 is constructed, the thickness of the slab 11 (the thickness from the lower surface of the deck plate 9 to the upper surface of the slab 11) can be grasped by reading the scale of the mark 5. In other words, the mark 5 is formed to a range equal to or greater than the preset maximum allowable thickness of the slab.

[0033] As described above, according to this embodiment, the thickness of the concrete to be poured can be easily grasped when pouring the concrete. In this case, the work of setting a jig with adjusted length and the work of drilling holes after pouring are not required, making the work easier.

[0034] In addition, after pouring the concrete, it is easy to confirm that the thickness of the slab 11 is within a predetermined thickness range. Therefore, after the slab 11 is constructed, a third party can easily manage the thickness of the slab 11 at the construction site by using the marks 5 provided on the surfaces of the columns 1. In this case, since the marks 5 are formed directly on the columns 1, mistakes and tampering by workers can be suppressed.

[0035] In the above-described embodiment, the mark 5 is formed on a part of the surface of the pillar 1, but as shown in Fig. 6(a), the mark 5a may be provided on the entire circumference of the pillar 1. In this way, the visibility of the mark 5a can be improved.

[0036] 6(b), a mark 5b may be provided on the surface of the column 1. The mark 5b is not a scale for measuring thickness, but allows the allowable lower limit and upper limit of the thickness of the slab 11 to be grasped, and by positioning the top surface of the slab 11 between the upper and lower limits, it can be grasped that the slab thickness is within a predetermined range.

[0037] Since there will be some discrepancy between the thickness of the concrete when it is poured and the thickness of the concrete after it has hardened, it is possible to set separate tolerance ranges for both when pouring and when maintaining the concrete (after hardening).

[0038] In the above embodiment, the marks are formed by engraving or painting on the surface of the pillar 1, but as shown in Fig. 7(a), the mark 5c may be attached to the surface of the pillar 1 by a sticker. In this way, the marks can be easily formed.

[0039] In this case, if the seal is a security tape, as shown in Fig. 7(b), when the seal is peeled off, a trace of the peeling off remains on the pillar 1. This makes it possible to prevent tampering.

[0040] Moreover, the marks 5 etc. may be provided on both the top and bottom of the diaphragm 7. In this case, the marks 5 etc. can be used for purposes other than controlling the thickness of the slab 11.

[0041] 8 is a conceptual diagram showing, as an example, a case where a suspended ceiling 13 is provided below a beam 3. When the suspended ceiling 13 is provided below a beam 3, the height of the suspended ceiling 13 may be made comprehensible by marks 5 or the like. In this way, the height of the suspended ceiling 13 can be easily adjusted.

[0042] Although the embodiment of the present invention has been described above with reference to the attached drawings, the technical scope of the present invention is not limited to the above-described embodiment. It is clear that a person skilled in the art can think of various modifications or alterations within the scope of the technical ideas described in the claims, and it is understood that these also naturally belong to the technical scope of the present invention. [Explanation of symbols]

[0043] 1. Pillar 3……Beam 5, 5a, 5b, 5c………Mark 7...Diaphragm 9...Deck plate 11………Slab 13.……Suspended ceiling

Claims

1. A method for managing slab thickness at a building construction site, comprising: A method for managing slab thickness at a construction site having columns, beams arranged horizontally relative to the columns, a deck plate arranged above the beams, and a concrete slab poured above the deck plate, characterized in that the thickness of the slab can be managed by marks provided on the surfaces of the columns.

2. 2. The method for managing slab thickness according to claim 1, wherein the mark is a scale that allows the distance from the beam to be grasped, and the thickness of the slab can be grasped by the scale.

3. 2. The method for controlling slab thickness according to claim 1, wherein the mark is formed on the surface of the pillar by engraving or painting.

4. 2. The method for controlling slab thickness according to claim 1, wherein the mark is formed by a sticker attached to the surface of the pillar.

5. 5. The method for managing slab thickness according to claim 4, wherein the seal is a security tape, and when the seal is removed, a trace of the removal is left on the column.

6. A column member for a joint structure used at a construction site, A diaphragm is attached to the end of the column, A pillar member, characterized in that a mark is provided on a surface of the pillar, which makes it possible to ascertain a predetermined distance from the diaphragm.

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