JPH0728309Y2 - Concrete top point - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a concrete crown point used as a crown reference for slab concrete or the like.

<Prior Art> Conventionally, as this type of concrete crown point, there is one shown in FIG. The concrete top end point (hereinafter referred to as the top end point) 50 includes a leg member 52 having two legs 51, 51, and a bolt member 54 screwed into a screw hole provided in a base portion 53 of the leg member 52. , The head 54a of this bolt member 54
And the bolt member 54 so that it is located between
It consists of a nut 55 that is screwed onto. Before placing the slab concrete, first, the contact portion 51 at the tip of the leg is
A and 51a are fixed to the slab form by nails or screws inserted in the holes, and the top end point 50 is set as shown in FIG.
The slab formwork 56 is installed upright, and then the bolt member of the top end point 50 in this installed state.
The bolt member 54 is rotated to the right or left with respect to the leg member 52 while measuring the level of the head 54a of the head 54a of the 54 using the level gauge 57 and the measuring rod 58 whose device height from the reference black is known. In other words, adjust the length of the top point 50, set the level of the crown to the desired slab concrete top level A, and finally the nut 55 so that the length of this top point 50 does not change. As a lock nut, tighten it to the base portion 53 (see the arrow in FIG. 6), fix the bolt member 54 to the leg member 52, and complete the attachment. The casting standard, that is, the top level, was used for the later slab concrete pouring.

<Problems to be Solved by the Invention> However, since the conventional top end point 50 is attached to the slab form 56 before the slab concrete is placed, as shown in FIG. In some cases, the worker may stumble during installation or hit the hose when moving the hose of the pump car, causing the top end point 50 to tilt or collapse as shown in Fig. 8. It was . Further, since the conventional concrete top point 50 is to be attached to the slab form 56 before placing the slab concrete, the slab form 56 to be attached is not yet familiar with the support work joists,
Therefore, when concrete is poured into this slab form 36, as shown in FIG. 9, it sinks downward due to the weight of the concrete, and accordingly, the level A at the crown of the top end point 50 is changed to the slab form. Along with 56, there was a problem that it fell downward (see A'in the figure). Therefore, in the case of direct concrete pressing, it is necessary to check the level of the concrete crown again using the surveying rod 60 and level gauge 57 as shown in Fig. 10 while placing concrete. , Needed extra effort to get a regular concrete crown.

In addition, the conventional crown point 50, focusing on the above points,
Even if you try to attach it to the slab formwork 56 after concrete settling has stopped, as shown in FIG.
The two leg portions 51, 51 fixed to 56 are opened in the shape of "C" toward the slab formwork side 56, and the contact portions 51a, 51a of the leg portions 51, 51 are fixed with nails or screws. Since it has a fixed structure, it was impossible to mount it after placing it.

Therefore, the purpose of this invention is that it can be easily and surely attached to the slab formwork after the concrete is placed, and therefore the once set concrete top level does not change, and it does not require much labor. It is to provide a concrete top point that allows the concrete top to be easily and accurately projected.

<Means for Solving the Problems> In order to achieve the above object, the concrete top end point of the present invention has a needle at one end of the base portion and a screw portion at the other end of the base portion, and further, the above base portion. A tip member provided with an annular step portion that receives an impact force in the axial direction on the side surface of the
One end side is provided with a threaded portion to be screwed into the threaded portion and a blind hole, and the other end is provided with a nut member having a rotation tool engaging portion, and the threaded portion side from the annular step portion of the tip member. Further, the nut member is characterized in that a pipe for hitting the annular step portion can be fitted externally.

<Operation> This concrete top end point is the annular step portion of the tip member in the state where the threaded portion provided on the other end of the base portion of the tip member is screwed into the threaded portion provided on one end side of the nut member. By applying an axial striking force to the annular stepped portion by a pipe through which the screw portion side and the nut member are inserted, in the slab concrete that has not been solidified yet by casting in the vicinity of the regular top end level in advance. The needle of the tip member is pushed into the slab mold until it is pushed into the slab mold so as to stand upright on the slab mold. Then, by engaging the rotating tool with the rotating tool engaging portion provided at the other end of the nut member at the standing concrete top end point, and rotating the rotating tool from the outside, the nut member is moved to the tip member. It is rotated with respect to the tip member to adjust the distance to the tip member so that the level of the top is adjusted to the regular top level. At this time, the slab formwork has already finished sinking due to the weight of the cast concrete, so the concrete top end point does not deviate from the regular top end level. The slab concrete is finally finished to the normal top level indicated by this nut member.

<Embodiment> Hereinafter, the present invention will be described in detail with reference to an illustrated embodiment.

FIG. 1 is a side view of an embodiment of a concrete top end point of the present invention, and 1 is a tip member composed of a base portion 2, a needle 3 and a screw portion 4. The base portion 2 of the tip member 1 is made of hard plastic, and is composed of a cylindrical portion 2a and a truncated cone portion 2b whose diameter becomes smaller as the distance from the cylindrical portion 2a increases. An annular step portion 2c is provided between the columnar portion 2a and the truncated cone portion 2b. At the center of the truncated cone of the truncated cone 2b, a rod-shaped tip 3a made of iron or glass fiber reinforced resin is provided.
A needle 3 having a needle is provided so as to project in the direction opposite to the cylindrical portion 2a. An annular contact surface 5 is formed around the needle 3 at the top of the head. On the other hand, at the center of the outer end surface of the cylindrical portion 2a, a screw portion 4 having an appropriate length is provided so as to protrude in a direction opposite to the needle 3. The tip member 1 is made by integrally molding the needle 3 and the screw portion 4 with the needle 3 and the screw portion 4 aligned with each other. At this time, since the ends 3a and 3b of the needle 3 and the screw portion 4 are embedded in the base portion 2 by a sufficient depth, the needle 3 and the screw portion 4 are firmly fixed to the base portion 2.

A nut member 6 is attached to the screw portion 4. This nut member 6 is made of hard plastic and has a cylindrical portion 2a.
And a blind hole 7 that does not penetrate in the axial direction at the center of the end surface on the side of the tip member 1 and has a columnar shape having a diameter substantially the same as that of the nut 8
Is embedded and fixed. The nut 8 is screwed into the threaded portion 4 of the tip member 1. The end 4a side of the screwed portion of the screw portion 4 with the nut 8 is housed in the blind hole 7 with a gap. Since the screw portion 4 has an appropriate length and the blind hole 7 has an appropriate depth, the nut member 6 has a movement range of a sufficient length in the axial direction. The upper end surface 9 of the nut member 6 is formed into a spherical surface. A prismatic fitting recess 10 serving as the rotating tool engaging portion is provided at the center thereof. By the above, the concrete crown point B is constituted. The crown 9a of the upper end surface 9 represents the level of the concrete top end point, and slab concrete described below is poured so that the level matches the crown 9a.

FIG. 2 is a view showing a state in which the top end point B is attached to the slab formwork 12 on which the concrete 11 is placed using the attachment jig C, and the top end point B is the slab formwork with the needle 3 attached.
It is mounted vertically on the slab formwork 12 with the contact surface 5 abutting the upper surface of the slab formwork 12 after being completely driven into the slab formwork 12.

In FIG. 2, reference numeral 13 denotes a pipe-shaped outer tube that constitutes an attachment jig C together with an inner tube and a slider, which will be described later, and a lower portion thereof is inserted with both the cylindrical portion 2a of the tip member 1 and the nut member 6. Its lower end surface is brought into contact with the stepped portion 2c. The cylindrical portion 2a of the tip member 1 is removably attached to the outer tube 13 and closely fitted inside. The nut member 6 is rotatably fitted inside the outer tube 13.

The outer tube 13 has a tip portion 15 having a prismatic fitting protrusion 14 capable of being fitted into the fitting recess 10 at the end portion, and a small diameter portion 16 of the tip portion 15.
A cylindrical part whose lower end is fitted to the outside and is fixed integrally with the tip 15.
An inner tube consisting of 17 and a cap 18 that closes the upper end of the tubular portion 17.
19 is inserted from the tip portion 15 side. The fitting protrusion 14 of the tip portion 15 is fitted into the fitting recess 10 of the nut member 6 so as not to rotate with each other. The outer diameter of this inner tube 19 is the outer tube
It is slightly smaller than the inner diameter of 13. Therefore, the inner pipe 19 is rotatable with respect to the outer pipe 13 while being fitted to the outer pipe 13. Therefore, by rotating the inner pipe 19, the nut member 6 can be rotated via the fitting portion, and the nut member 6 can be moved in the axial direction with respect to the tip member 1. At this time, since the needle 3 is driven into the slab form 12 and the tip member 1 and the outer pipe 13 are embedded in the concrete 11, the tip member 1 does not rotate, but only the nut member 6 rotates. Inner tube 19 is a fitting protrusion
In a state in which the fitting recess 14 is fitted in the fitting recessed portion 14, the outer pipe 13 is projected upward by a sufficient length from the upper end surface thereof. At the upper portion of the inner pipe 19 protruding above the upper end surface of the outer pipe 13, a fixing bolt 20
A cylindrical slider 22 that can be fixed at any position by means of and has a level point scale 21 on the outer periphery is externally fitted and fixed. This slider 22 can change its fixed position between the cap 18 and the upper end surface of the outer tube 13, and its level point scale 21 is collimated by a level gauge 24 whose installation height ha from the reference black ink 23 is known. Then, the crown 9a of the crown point B is fixed to the inner tube 19 thereof so as to show the normal crown level.

Hereinafter, the top end point B is attached using the attachment jig C, and the crown 9a of the top end point B is attached using the known level meter 24.
The method of setting the normal top level will be described.

First, before installing the top end point B, as shown in FIG. 3, find the installation height ha of the level meter 24 from the reference ink 23, and determine the installation height ha, the reference ink 23, and the desired regular concrete ceiling. From the dimension hb between the end level a, the level meter 24
The dimension H between the installation level b and the regular concrete crown level a is calculated. Then, as shown in FIG.
The top end point B is attached to the lower portion of the outer pipe 13 of the mounting jig C (see FIG. 2), while the slider 22 fitted onto the inner pipe 19 is fitted.
The fixing position on the inner pipe 19 is adjusted and fixed so that the dimension between the level point scale 21 and the lower end surface 19a of the tip portion 15 of the inner pipe 19 becomes H dimension. Once the position of the slider 22 is adjusted, it need not be performed again while the same slab is hit. Next, as shown by the arrow in the figure, insert the inner tube 19 whose position has been set on the slider 22 into the outer tube 13, and insert the fitting protrusion.
14 is fitted into the fitting recess 10 at the top end point B.

After the rough slab concrete is placed, the slab formwork
When the subsidence of 12 is stopped, then, as shown in FIG. 2, the mounting jig C with the top end point B attached is
Push vertically into the concrete at the desired position from the top end point B side, hit the head of the inner pipe 19 with a hammer, and
The needle 3 at the top end point B is driven into the slab formwork 12 via 19. At this time, since the tip end member 1 at the top end point B has the tapered shape as described above, it is possible to easily push it into the concrete 11 while pressing the aggregate such as the ballas outward by the conical surface 2b-1. In addition, since the needle 3 is sharp, it can be easily driven and fixed to the wooden slab formwork 12. Since the tip member 1 has a tapered shape, the area where the base 2 is exposed on the lower surface of the slab becomes small when the slab frame 12 is removed after the concrete is hardened.

Then, with the needle 3 driven into the slab form 12, the inner tube
Rotate 19. Then, the slider 22 fixed to the inner pipe 19
Is positioned at a height whose level point scale 21 is exactly collimated by the level meter 24. When the inner pipe 19 is rotated clockwise or counterclockwise, the rotation is transmitted to the nut member 6 and the tip member 1 does not rotate because the needle 3 has been driven into the slab form 12 so that only the nut member 6 rotates and the nut member 6 rotates. The crown 9a of the member 6 moves in the axial direction with respect to the tip member 1 such that it descends when it is rotated to the right and rises when it is rotated to the left. And along with that, the level point scale 21
It always moves in the axial direction while maintaining the crown 9a and the dimension H. Therefore, when the inner tube 19 is rotated in an appropriate direction by an appropriate angle so that the level point scale 21 of the slider completely matches the installation level of the level meter 24, the crown 9a of the top end point B is reached.
Is set to the regular crown level.

When the setting of the top end level is completed, the inner pipe 19 and the outer pipe 13 are respectively removed from the top end point B, and the top end point B is left in the slab concrete 11 as shown in FIG.
Complete the installation of one crown point B. When the outer tube 13 is removed, the frictional force between the needle 3 and the slab frame 12 is larger than the frictional force between the outer tube 13 and the columnar portion 2a, so that the needle 3 is reliably driven into the top end point B. It remains in the concrete 11 in a closed state, and the crown 9a does not move. From the above,
The crown 9a is accurately set to the normal crown level a. By repeating the above procedure, the required number of top end points B are attached to the slab form 12, and the attachment of the top end points B is completed. As shown in FIG. 7, the top end of the roughly placed slab concrete 11 is finished with a trowel so as to match the crown 9a, and is finished to an accurate regular top end level. At this time, since the upper end surface 9 is formed by a part of the spherical surface and the peripheral edge portion is lower than the crown 9a, it is possible to prevent the trowel from being caught. This top end point B is so-called completely filled. A plurality of needles may be ejected.

<Effects of the Invention> As is clear from the above, the concrete top end point of the present invention has a tip member having a needle and a screw portion at both ends of a base portion provided with an annular step portion, and one end side While having a threaded portion that is screwed into the threaded portion, while the other end is provided with a nut member having a rotating member engaging portion, at the concrete top end point integrally formed by the tip member and the nut member. The needle is driven into a slab formwork in which slab concrete is roughly placed by applying a striking force to the annular stepped portion with a pipe through which the nut portion is inserted from the annular stepped portion of the tip member. It is possible to easily and securely attach the concrete top end point. Further, by the rotating tool engaged with the rotating tool engaging portion of the nut member, the nut member is rotated to adjust the length between the nut member and the tip member, and the crown level indicated by the nut member is adjusted. It can be easily set to a desired level. Therefore, by using this top end point, the top end level can be set easily and accurately, and the top end level once set does not shift downward due to the concrete weight as in the conventional case.

In other words, if slab concrete is placed using this top point as a reference, the top level can be accurately obtained, and the re-check of the top level required when placing using conventional top points is performed. By eliminating the work, the work efficiency of placing can be improved much more than before.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the concrete top end point of the present invention, and FIG. 2 is a perspective view of the concrete top end point of FIG. Sectional view after setting the edge level, Fig. 3 is an explanatory view of slab concrete pouring, Fig. 4 is an explanatory view of attaching concrete top end points to an attachment jig, and Fig. 5 is completed installation Figure showing the top of slab concrete finished based on the concrete top point, Figure 6 is a perspective view of the conventional concrete top point, and Figures 7, 8, 9, and 10 are the conventional concrete top points. It is explanatory drawing of the slab concrete pouring using. 1 ... Tip member, 3 ... Needle, 4 ... Screw part, 6 ... Nut member.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-50-30371 (JP, A) JP-A-49-8531 (JP, A) Jpn. Application No. 60-175643 (Jpn. Of the specification and drawings attached to the application of Microfilm (JP, U) Contents of the description and drawings attached to the application of Japanese Utility Model Application No. 52-38266 (Japanese Utility Model Application No. 53-133432) Micro film (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A tip member having a needle at one end of a base portion, a threaded portion at the other end of the base portion, and an annular step portion which receives an axial impact force on a side surface of the base portion. , A threaded portion that is screwed into the threaded portion and a blind hole are provided on one end side, and a nut member that has a rotation tool engagement portion is provided on the other end, and the threaded portion is formed from the annular step portion of the tip member. The side and the nut member can be fitted with a pipe that hits the annular step portion, and a concrete top end point.