JP2016132919A - Concrete placing face finishing method and top level setting device used for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately finish a concrete placing face.SOLUTION: A concrete placing face finishing method comprises following steps: to lay a pair of elongated top level indication members in parallel with each other along the foundation; to set a height of each top level indication member from the foundation to the height corresponding to a desired concrete finishing face; to supply ready mixed concrete on the foundation between the pair of top level indication members; to place an elongated leveling member between one member and the other member of the pair of top level indication members; and to level the ready mixed concrete by sliding the placed leveling member on the top level indication members in a longer direction of the top level indication members.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a method for finishing a concrete casting surface and a top end setting device used therefor.

  Building floor foundation work is carried out by building a formwork for the foundation structure, or by placing crushed stone inside the inner foundation of the structure and placing concrete on the reinforcing bars. . At the time of placing the concrete, a top end indicating tool for instructing the top end is used in advance, and the concrete is cast to the indicated level to finish the placing surface.

  As a top end indicating tool used for such construction, a top end extending auxiliary tool is known which includes a bar indicating the top end level and a fixing member for fixing the bar to the reinforcing bar so as to be movable in the vertical direction. (For example, refer to Patent Document 1).

Japanese Patent No. 5271878

  In conventional concrete placement work using such a top edge assisting tool, the concrete placement surface is finished with the tip of the bar indicating the top edge level, that is, the point as a mark, so the placement surface is evenly accurate. In order to finish well, it is necessary to arrange a large number of bars showing the top level at high density in the concrete placement area.

  However, if the bars that indicate the top level are arranged at high density, the concrete placing operator, the ready-mixed concrete supply hose, etc. will come into contact with the bars, and the set top level will be shifted or There was a problem that the edge assisting tool itself was damaged.

  The present invention has been made in consideration of such circumstances, and the top end indication method is converted from a conventional method using the tip (point) of a bar to a method using a main body (line) of the bar. By this, the finishing method of the concrete casting surface which solved the said subject, and the top end setting apparatus used for it are provided.

  In the present invention, a pair of elongate top end indicating members lie along the ground in parallel with each other, and the height of each top end indicating member from the ground is set to a height corresponding to a desired concrete finish surface. The ready-mixed concrete is supplied onto the ground between the top end indicating members of the pair, and an elongated leveling member is passed from one of the pair of top end indicating members to the other, and the passed leveling member is placed in the longitudinal direction of the top end indicating member. The present invention provides a method for finishing a concrete placing surface comprising a step of sliding on an end indicating member to level the ready-mixed concrete.

  Since the height of the pair of elongated top end indicating members is set to the height of the concrete finish surface, the ready-mixed concrete supplied between the pair of top end indicating members is leveled by the leveling member passed between the top end indicating members. Even if the length of the top end indicating member and the distance between the top end indicating members are sufficiently larger than the distance between the bars indicating the conventional top end level, the concrete placement surface can be finished with high accuracy.

It is a top view of the top end setting device according to the present invention. It is AA arrow sectional drawing of FIG. It is a front view of the top end indication device concerning this invention. It is arrangement | positioning explanatory drawing of the top end setting apparatus which concerns on this invention. It is operation explanatory drawing of the top end setting apparatus which concerns on this invention. It is a front view which shows the installation state of the top end indicating member which concerns on this invention. It is a top view which shows the installation state of the top end indicating member which concerns on this invention. It is concrete drawing process explanatory drawing which concerns on this invention. It is concrete drawing process explanatory drawing which concerns on this invention. It is concrete drawing process explanatory drawing which concerns on this invention.

  In the method for finishing a concrete placing surface according to the present invention, a pair of elongate top end indicating members lie along the ground in parallel with each other, and the height of each top end indicating member from the ground corresponds to a desired concrete finished surface. Set the height, supply ready-mixed concrete on the ground between the pair of top end indicating members, pass an elongated leveling member from one of the pair of top end indicating members to the other, and pass the passed leveling member to the top It comprises a step of leveling the ready-mixed concrete by sliding on the top end indicating member in the longitudinal direction of the end indicating member.

  The desired concrete finish surface may be a horizontal surface or may be inclined with respect to the horizontal.

  The present invention is a top end setting device used in a step of setting the height of the top end indicating member from another viewpoint, the holding member holding the top end indicating member, and the holding member coupled to the holding member A top end setting device is provided that includes an adjustment member that adjusts the height of the member from the ground, and a fixing member that fixes the adjustment member to the ground.

  The adjustment member may include a female screw portion and a male screw portion that is screwed into the female screw portion, thereby adjusting the height.

  The fixing member may be a pile driven into the ground, or may be a member fixed to the ground with mortar.

[Embodiment]
Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. This does not limit the invention.
1 is a top view of a top end setting device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, and FIG. 3 is a front view of the top end indicating member of this embodiment.

  As shown in FIGS. 1 and 2, the top end setting device 1 adjusts the holding member 2 for holding the top end indicating member 7 shown in FIG. 3 and the height of the holding member 2 from the ground 9. The member 3 and the square pile 6 as a fixing member which fixes the adjustment member 3 to the ground 9 are provided.

  The adjustment member 3 includes a cylindrical member 4 and a support base 5. The cylindrical member 4 includes a flange 4b formed on the upper end, a male screw portion 4a formed on the outer periphery, and a retaining screw 2d that is screwed into a screw hole formed below the flange 4b.

  The support base 5 has a truncated cone shape, and includes a hole 5a formed in the axial center and a female screw portion 5b formed on the inner peripheral surface of the hole 5a. The lower surface of the support base 5 and the upper end of the square pile 6 are fixed to a screw hole 6a formed in the axial center from the upper end of the square pile 6 toward the tip using a fixing bolt 6b and a washer 6c. Yes. The cylindrical member 4 and the support base 5 are coupled to each other when the male screw portion 4a is screwed into the female screw portion 5b.

  The holding member 2 is composed of a trapezoidal cylinder at the top and a small diameter cylinder at the bottom, and is coaxial with each other. A small-diameter column portion is inserted from the upper end of the cylindrical member 4, and the large-diameter column portion is rotatably supported about the axis on the upper surface of the flange 4 b of the cylindrical member 4.

  In the holding member 2, a holding groove 2a for holding the end of the top end indicating member 7 (FIG. 3) is formed on the upper surface. Then, fixing screws 2b are screwed into two parallel screw holes 2e formed in a direction perpendicular to the holding groove 2a.

As will be described later, the fixing screw 2b is used to fix the top end indicating member 7 to the holding groove 2a when the end of the top end indicating member 7 (FIG. 3) is inserted into the holding groove 2a.
Further, a circumferential groove 2c is formed on the outer peripheral surface of the small-diameter column of the retaining member 2a, and the retaining member 2 comes out of the cylindrical member 4 by inserting the aforementioned retaining screw 2d into the circumferential groove 2c. It is prevented.

  By such a mechanism, when the operator rotates the flange 4b about the axis while maintaining the holding member 2 so as not to rotate, the holding member 2 is engaged by the screwing action of the male screw portion 4a and the female screw portion 5b. Can be moved vertically with respect to the support 5. That is, the height of the holding member 2 can be adjusted.

And the installation to the ground 9 of the top end setting apparatus 1 shown to FIG. 1 and FIG. 2 is performed in the following procedures.
First, the square pile 6 is driven into the ground 9.
Next, the support base 5 is installed on the upper end of the square pile 6, and both are combined using the fixing bolt 6b and the washer 6c.
Next, the male screw portion 4a of the cylindrical member 4 in which the holding member 2 is inserted in the upper end in advance and is prevented from being removed by the retaining screw 2d is screwed into the female screw portion 5b of the support base 5.

  The top end indicating member 7 shown in FIG. 3 is a belt-like plate having a length L = 1800 mm, a width W = 25 mm, and a thickness 4 mm, and has a long hole 7a penetrating in the thickness direction at both ends, and two long holes 7a. A plurality of round holes having a diameter of 12.5 mm penetrating in the thickness direction.

  In this embodiment, the holding member 2 and the cylindrical member 4 are molded using ABS resin, the support 5 is molded using POM resin, and the square pile 6 is molded using PS resin, each using a mold. Moreover, the top end indicating member 7 is manufactured by subjecting carbon steel (SS41) to sheet metal processing.

A method of finishing a concrete placing surface using the top end setting device 1 and the top end indicating member 7 having such a configuration will be described in detail.
First, as shown in FIG. 4, the square pile 6 (FIG. 2) is driven into the installation position of the top end setting device 1 indicated by the horizontal pitch P1 = 2500 mm and the vertical pitch P2 = 1800 mm on the ground.

Next, the top end setting device 1 is assembled as described above. That is, first, the support base 5 is fixed to the driven corner pile 6 using the fixing bolt 6b and the washer 6c.
Next, the male screw portion 4a of the cylindrical member 4 provided with the holding member 2 at the upper end is screwed into the female screw portion 5b of the support base 5, and the top end setting device 1 shown in FIG. 2 is assembled.

  Next, as shown in FIG. 5, a laser receiver 8 is installed in each assembled top end setting device 1, and each laser receiver receives a horizontal laser beam LB indicating a concrete finish surface (top end). 8 is irradiated.

  The operator rotates the flange 4b and sets the height of the laser receiver 8, that is, the height of the holding member 2, at a position where the laser receiver 8 just receives the laser beam. Commercially available laser receivers 8 and laser emitters can be used.

  When the setting of the height of each holding member 2 of the top end setting device 1 shown in FIG. 4 is completed, as shown in FIG. 6 and FIG. 7, the figure is placed between a pair of top end setting devices 1 adjacent in the vertical direction. 3 is suspended and the fixing screws 2b (FIG. 1) are inserted into the long holes 7a at both ends to hold the end of the top end indicating member 7 on each holding member 2.

  Thereby, the top end indicating member 7 shown in FIGS. 6 and 7 indicates the concrete finish surface (top end).

Next, as shown in FIG. 8, ready-mixed concrete is supplied to the ground until the top end indicating member 7 is hidden.
Next, as shown in FIGS. 9 and 10, the operator orthogonally crosses the leveling plate (length 3 m) 11 a of the leveling tool (dragonfly) 11 with the two top end indicating members 7 facing in parallel. Then, the handle 11b provided at a right angle in the center of the leveling plate 11a is pulled in the direction of the arrow.

Thereby, the leveling plate 11a slides on the top end indicating member 7, so that the ready-mixed concrete 10 is uniformly leveled to the height indicated by the top end indicating member 7, and the placed concrete surface is precisely Finished uniformly.
In this embodiment, as shown in FIG. 5, each laser receiver 8 is irradiated with a laser beam LB in the horizontal direction so that the concrete finish surface becomes horizontal. If a laser beam inclined by an angle of 5 to 1 degree is used, the top end indicating member 7 is set to be inclined at that angle with respect to the horizontal.

  Therefore, the surface of the ready-mixed concrete 10 is finished to have the inclination. This is very effective for finishing concrete placing surfaces such as rooftops of buildings that require drainage gradients and food factory floors.

  As shown in FIG. 4, when the square pile 6 (FIG. 2) is driven into the ground, if the ground is too hard to be driven or if it is too soft and unstable, a hole of an appropriate size is previously formed in the ground. The square pile 6 may be pushed in and fixed after piercing and injecting mortar into the hole. In this case, instead of the square pile 6, a member having a shape other than the shape of the pile can be used.

Further, the top end indicating member 7 has a large number of round holes 7b as shown in FIG. 3, and this is for joining the ready-mixed concrete 10 separated by the top end indicating member 7 through the round holes 7b.
Therefore, when it is necessary to form a groove on the concrete placement surface to prevent surface cracking, if the top end indicating member 7 having no round hole 7b is used instead of forming the groove, such a surface is used. Cracking is prevented.

  In addition, a vibrator (vibration device) is mounted on the leveling plate 11a of the leveling tool (dragonfly) 11 shown in FIGS. 9 and 10, and the leveling plate 11a is several tens in the direction orthogonal to the concrete placement surface. By applying a slight vibration of up to several hundred Hz, the leveling plate 11a can be smoothly slid on the top end indicating member 7 with a smaller pulling force.

DESCRIPTION OF SYMBOLS 1 Top end setting apparatus 2 Holding member 2a Holding groove 2b Fixing screw 2c Circumferential groove 2d Retaining screw 3 Adjustment member 4 Cylindrical member 4a Male screw part 4b Flange 5 Support stand 5a Hole 5b Female screw part 6 Square pile 6a Screw hole 6b Fixing bolt 6c Washer 7 Top end indicating member 7a Long hole 7b Round hole 8 Laser receiver 9 Ground 10 Ready-mixed concrete LB Laser beam 11 Dragonfly 11a Leveling plate 11b Handle

Claims (6)

  A pair of elongate top end indicating members lie along the ground in parallel with each other, and the height of each top end indicating member from the ground is set to a height corresponding to a desired concrete finish surface. Supply ready-mixed concrete on the ground between the members, pass a long and thin leveling member from one of the pair of top end indicating members to the other, and pass the leveled member on the top end indicating member in the longitudinal direction of the top end indicating member A method for finishing a concrete casting surface comprising a step of smoothing the ready-mixed concrete by sliding in a step.   The method of claim 1, wherein the desired concrete finish surface is a surface inclined with respect to a horizontal plane.   The top end setting device used in the step of setting the height of the top end indicating member according to claim 1, comprising: a holding member that holds the top end indicating member; and a base member of the holding member that is coupled to the holding member. A top end setting device comprising: an adjustment member that adjusts the height of the head; and a fixing member that fixes the adjustment member to the ground.   The top end setting device according to claim 3, wherein the adjustment member includes a female screw portion and a male screw portion that is screwed into the female screw portion, thereby adjusting the height.   The top end setting device according to claim 3 or 4, wherein the fixing member is a pile driven into the ground.   The top end setting device according to claim 3 or 4, wherein the fixing member is a member fixed to the ground with mortar.

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