JPH1037209A - Marking form for casting civil construction ruler table - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a form which can be placed and fixed on the ground without taking much time and in which a top end thereof can be rapidly positioned and a mortar ruler table can be efficiently cast by precisely setting the top end to a predetermined level. SOLUTION: A form 38 comprises a cylindrical outer frame 11, a cylindrical inner frame 12 having an outer diameter small than the inner diameter of the frame 11, and a level measuring rod 15 supported by the frame 12. Three protrusions 16 are provided on the inner surface of the frame 11, three arms 17 are projected from the outer surface of the frame 11, and three leg materials 18 are provided on the lower periphery of the frame 11. Three arms 19 are projected from the outer periphery of the frame 12. The frame 11 is placed on the ground. Screws 20 each provided on the arms 19 of the frame 12 are placed on the arms 17 of the frame 11 to mount the frame 12 on the frame 11 and the screws 20 are turned to make horizontal the upper periphery 13 of the frame 12 and mortar is placed in an opening 29 of the frame 12 to form a mortar ruler table.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mortar base plate 36 for supporting foundations, beams, columns, piers, etc. (hereinafter, referred to as "civil structures") in civil engineering works and building works (hereinafter, referred to as "civil works"). Is used when casting the ground on the ground 34.

[0002]

2. Description of the Related Art A mortar surface plate 36 for supporting an earth-construction structure in civil engineering work is cast on a ground 34 by means of four through-plates 39 on a black-out formwork for casting a civil engineering work surface plate. A square formwork 41 surrounding the mortar casting space 40 in a square
Is used.

The square frame 41 is mounted on the ground 34, and a level measuring jig 42 is mounted on the inner surface of the through plate 39.
To mark the mark 43 of a required level, and one worker applies black ink to the mark 43 on the inner surface of the perforated panel 39 to be nervous, and another worker pulls the black ink to strike the mark. , And position the top 37 of the mortar to be cast there (FIG. 1).
1) The mortar 32 injected into the square mold 41 is flattened with the iron 44 in accordance with the mark 43, and the mortar surface plate 36 is set (FIG. 12).

[0004]

The rectangular formwork 41 is small and light, since it is made of wood, and easily shifts during the blacking operation. For this reason, it is necessary to place earth and sand or gravel around the rectangular form 41, temporarily fix the ground 34 by driving mortar, or the like, and then drive the mortar 32 into the inside 41 of the rectangular form 41. .

[0005] Above all, since the inking of the inner surface of the through plate 39 must be performed by bending down and looking into the inside 41 of the formwork, it is difficult to perform the work, it takes much time, and the top of the mortar surface plate is required. It is difficult to position the end 37 accurately. Further, the mortar or slag injected into the mold forms and the mark 43 becomes difficult to see, and the mortar in the mold is difficult to hold down with an iron. Irregular)
Is easy to do.

[0006]

SUMMARY OF THE INVENTION Therefore, according to the present invention, it is possible to quickly position the top end 37 without troublesome mounting and fixing it on the ground 34, and to accurately adjust the top end 37 to a predetermined level. An object of the present invention is to obtain a formwork 38 on which a mortar base 36 can be efficiently cast.

[0007]

Means for Solving the Problems A blackout formwork for placing a civil engineering work surface plate according to the present invention comprises: (a) an outer frame having a circular cross-sectional shape, and a circular cross-section having an outer diameter smaller than the inner diameter of the outer frame. It comprises an inner frame of a shape and a level measuring rod supported on a pedestal mounted on the periphery of the inner frame. (B) Three pieces from the inner peripheral surface of the outer frame toward the center of the circular cross section. (C) three arms project from the outer peripheral surface of the outer frame in the opposite direction to the center of the circular cross section, and (d)
Three leg members protrude in parallel from the outer edge of one side of the outer frame, and (e) three arms also extend from the outer peripheral surface of the inner frame in the opposite direction to the center of the circular cross section. (F) three projections and three arms and three legs of the outer frame and three arms of the inner frame around the center of each circular cross-section of the outer frame and the inner frame; The central angles (α, β and α ′, β ′) between adjacent projections, between arms and between legs are less than 180 degrees and greater than 90 degrees (9
0 ° <α, β, α ′, β ′ <180 °), (g) the distance from the center of the inner frame to the tip of the arm is larger than the radius of the outer periphery of the outer frame, and (h) the distance from the inner frame The central angle (α ′, β ′, γ ′) between the matching arms is equal to the central angle (α, β, γ) between the adjacent arms of the outer frame, and (i) the three arms of the inner frame Are screwed and project in parallel in a three-dimensional manner. (J) At least one of the three projections on the outer frame is oriented from the outer peripheral surface to the inner peripheral surface of the outer frame. The first is that the push screw is screwed into the penetrated screw hole.
The feature of.

A second feature of the mold according to the present invention is that, in addition to the first feature, the lower ends of the screws protruding from the three arms of the inner frame are fixed to the three arms of the outer frame. The distance (height) from the lower edge of the inner frame to the arm of the inner frame is determined by the distance (height) from the upper edge of the outer frame to the protrusion. ), The inner frame is fitted between the three projections of the outer frame, and the tips of the three projections press the outer peripheral surface of the inner frame, and the three projections cause the inner frame to be fitted. Is locked to the outer frame.

A third feature of the formwork according to the present invention is that, in addition to the above-mentioned second feature, the arm of the outer frame is provided with a recess whose inner surface forms a hemispherical shape. That is, the lower end of the screw is fitted.

A fourth feature of the mold according to the present invention is that, in addition to any one of the second and third features, the inner diameter (A) of the upper peripheral edge of the inner frame is the inner diameter (B) of the lower peripheral edge. And the inner peripheral surface of the inner frame has a conical shape. The inner frame is
A cylindrical outer surface material and an inner surface material fitted inside an opening of the outer surface material, wherein an inner diameter A of an upper peripheral edge of the inner surface material is smaller than an inner diameter B of a lower peripheral edge, and the inner peripheral surface is formed into a conical shape; It is preferable that the outer peripheral surface of the material is in close contact with the opening of the outer surface material. The three projections, three arms and three legs of the outer frame around the center of each circular cross section of the outer frame and the inner frame, and
The central angles (α, β, γ and α ′, β ′, between the adjacent projections, between the arms and between the legs of the three arms of the inner frame.
γ ′) may be set to 120 degrees.

A fifth feature of the formwork according to the present invention is that, in addition to any of the first, second, third, fourth, fifth and sixth features, a platen having a flat base is provided. The level measuring rod is vertically supported on the pedestal, and a bubble tube is attached to the pedestal. The three projections of the outer frame are formed by thumb screws screwed into screw holes penetrating from the outer peripheral surface of the outer frame toward the inner peripheral surface. Use thumbscrews.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A black-out formwork 38 for laying an earthwork surface table shown in FIGS. 1 to 7 is an outer frame 11 having a circular cross-sectional shape.
And an inner frame 12 having a circular cross-sectional shape whose outer diameter is smaller than the inner diameter of the outer frame 11, and a level measuring rod 15 supported on a pedestal 14 mounted on a peripheral edge 13 of the inner frame 12. ing.

The pedestal 14 is constituted by a flat surface plate.
A level measuring rod 15 is supported vertically on the pedestal 14, and a bubble tube 31 is attached to the pedestal 14.

For the outer frame 11 and the inner frame 12, round steel pipes are used. For the outer frame 11, a round steel pipe thicker than the inner frame 12 is used. That is, these round steel pipes, the length is sufficiently shorter than the thickness,
The outer frame 11 is shorter than the inner frame 12. Thus, in order to eliminate the displacement at the time of installing the formwork 38, the outer frame 11 and the inner frame 12 may be formed of a steel pipe or the like. In the present invention,
“Length” of the outer frame 11 and the inner frame 12 means “height” when the blackout formwork 38 for placing the earthwork on the earthwork is placed on the ground 34 and used. When the outer frame 11 and the inner frame 12 are viewed as a flat member formed by cutting a steel pipe into a circle, the outer frame 11 and the inner frame 1 are used.
2 means "thickness".

Three projections 16 project from the inner peripheral surface of the outer frame 11 toward the center 33 of the circular cross section. These three projections 16 are formed by thumb screws, and are screwed into screw holes penetrating from the outer peripheral surface of the outer frame 11 toward the inner peripheral surface. Three arms 17 protrude from the outer peripheral surface of the outer frame 11 in the opposite direction to the center 33 in the circular cross section, and three leg members 18 are parallel to each other from one side of the outer frame 11. It is protruding.

From the outer peripheral surface of the inner frame 12, three arms 19 project in opposite directions to the center 33 'in the circular cross section. Each of these three arms 19 has a thumbscrew 2
0 are screwed on and their thumbscrews 20 are
And project in parallel in a three-dimensional form. The distance from the center 33 ′ in the circular cross section of the inner frame 12 to the tip of the arm 19 is
It is longer than the outer radius of the outer frame 11.

The three thumbscrews 16 and the three arms 17 and the three leg members 18 around the center 33 of the outer frame 11 are located between adjacent projections 16 and 16, between the arms 17 and 17, and between the leg members. The central angles (α, β, γ) of 18.18 are 120 degrees. Also, between the adjacent arms 19. 1 of the three arms 19 and the three thumb screws 20 around the center 33 ′ of the inner frame 12.
9 and center angle between 20 and 20 between the thumb screws (α ', β', γ ')
Is 120 degrees. The distance (height) from the lower peripheral edge 23 of the inner frame 12 to the arm 19 is larger than the distance (height) from the upper peripheral edge 21 of the outer frame 11 to the thumbscrew 16.

For this reason, the blackout formwork 38 for placing the earthwork on the surface plate of the earthwork is provided with the lower ends of the thumb screws 20 protruding from the three arms 19 of the inner frame 12 and the three arms 17 of the outer frame 11. When the inner frame 12 is placed on the outer frame 11, the inner frame 12 is fitted between the three thumb screws 16 of the outer frame 11, and the three thumb screws 16 are tightened. When the outer peripheral surface of the inner frame 12 is pressed, the inner frame 12 is locked to the outer frame 11 by the three thumb screws 16.

The arm 17 of the outer frame 11 is provided with a depression 22 whose inner surface 24 has a hemispherical shape. Three thumbscrews 16 and three arms 17 around the center 33 of the outer frame 11 and between adjacent projections 16 and 16 of the three legs 18, between arms 17 and 17 and between legs 18 and 18. Central angle (α,
β, γ) is 120 degrees, and three arms 19 and three thumb screws 20 around the center 33 ′ of the inner frame 12.
Since the central angles (α ′, β ′, γ ′) between the adjacent arms 19, 19 and the thumb screws 20, 20 are also 120 degrees, when the inner frame 12 is mounted on the outer frame 11, The lower end of the thumbscrew 20 of the inner frame 12 fits into the recess 22.

Thus, the inner frame 12 is connected to the outer frame 11
And is supported by the outer frame 11, and the opening 2 of the inner frame 12 is
The mortar 32 is cast into the 9 and used. that time,
The upper peripheral edge 13 of the inner frame 12 protrudes higher than the upper peripheral edge 21 of the outer frame 11, and the lower part of the inner frame 12 fitted inside the outer frame 11 is fixed by a thumbscrew 16 protruding from the outer frame 11. The inner frame 12 is fixed to the outer frame 11 by being tightened, and the outer frame 11 is a member for locking and supporting the inner frame 12 to be fitted therein with the thumb screw 16. Rim 2
The distance (height) from 1 to the thumbscrew 16 may be shorter than the distance (height) from the lower peripheral edge 23 of the inner frame 12 to the arm 19, and the outer frame 11 is made smaller than the special inner frame 12. It doesn't need to be long (high).

The outer frame 11 is supported on the ground by three leg members 18 and is stabilized. The inner frame 12 is supported by the outer frame 11 by three screws 20 and is stable. The lower end of the thumbscrew 20 is fitted into the inner frame 12 during the process of placing the mortar 32 into the inner frame 12.
Misalignment is prevented.

The three thumb screws 16 and three arms 17 and three leg members 18 of the outer frame 11 and the three arms 19 and three thumb screws of the inner frame 12 are arranged in the circumferential direction. 20
Form a set of three central angles (α, β, γ and α ′, β ′, γ ′), each of which has two adjacent angles, each of which has three central angles (α, β, γ and α ', β',
γ ′) is 360 degrees.

In the present invention, the outer frame 11 around the center 33, 33 'in each circular cross section of the outer frame 11 and the inner frame 12 is provided.
(Thumb screws) 16, three arms 17 and three legs 18, and three arms 19 of the inner frame 12.
Between their two adjacent projections (thumb screws)
16, the central angles (α, β and α ′, β ′) of the arms 17 and 17 and 19 and 19 and the legs 18 and 18 are less than 180 degrees and larger than 90 degrees (90 ° <α). , Β,
α ′, β ′ <180 ° mean the central angles (α
.Beta. And .alpha. '.. beta.') In the range of 90 degrees to 180 degrees, respectively. In that case, the central angles (γ and γ ′) of each of the other remaining ones are less than 180 degrees, including the case where the central angles (γ and γ ′) are 90 degrees or less.

By the way, the center of gravity of the outer frame 11 and the inner frame 12 having a circular cross section is located at the center (33 円 形) of the circular cross section.
33 '). On the other hand, three central angles (α, β, γ and α ′, β ′, 3) formed between each of the three thumbscrews, arms, etc. (16 to 19) placed on the circumference of the circular cross-sectional shape.
γ ′) is 90 ° <α, β and α ′ · β ′ <180
° and 0 <γ and γ ′ <180 °, the center (33 · 33 ′) of the circular cross-sectional shape is the three thumbscrews, arms, etc. (16-19) and three The center of gravity of the outer frame 11 and the inner frame 12 will be located inside the triangle at the same time. Therefore, even if the central angle (γ and γ ′) of one of the three is as small as zero (0 °), if it is not zero (0 °) (γ and γ ′>
0), those three thumbscrews, arms, etc. (16-19)
As a result, the outer frame 11 and the inner frame 12 are stably supported in a three-dimensional manner.

However, these three thumbscrews, arms and the like (16 to 19) have a central angle (α, β, γ and α ′, β ′, γ ′) of 120 degrees, respectively. ,
Even if the positional relationship between the three thumbscrews and arms (16 to 19) slightly fluctuates, the center of gravity of the outer frame 11 and the inner frame 12 is positioned outside the triangle formed by the three thumbscrews and arms. The outer frame 11 and the inner frame 12 do not move.
Will be supported most stably. Therefore, three thumbscrews 16 and three arms 17 around the center 33 of the outer frame 11 and each adjacent protrusion 16.
6, the central angles (α, β, γ) of the arms 17 and 17 and the legs 18 and 18 and 3 around the center 33 ′ of the inner frame 12.
The central angle (α ', between the adjacent arms 19 and 19 of the three arms 19 and the three thumb screws 20 and the interval between the thumb screws 20 and 20
β ′ and γ ′) are each set to 120 degrees, which is a preferred embodiment of the present invention.

The leg member 18 is inserted into the ground 34 with a shoe sole or the like to fix the outer frame 11, and the thumb screw 16 is tightened on the outer peripheral surface of the inner frame 12 from three sides, thereby fixing the outer frame 11 and the inner frame. 12
Are integrated. The thumbscrew 16 fixes the inner frame 12 to the outer frame 11 in such a manner, and the three projections 1
It is sufficient if one of the six is a thumbscrew. However, even when the center of gravity of the inner frame 12 shifts together with the outer frame 11 when the leg member 18 is inserted into the ground 34, the protrusion length of the projection 16 is changed to easily return the center of gravity of the inner frame 12 to the original position. It is desirable that all the projections 16 be thumb screws so that the position of the inner frame 11 in the opening 26 of the outer frame 11 can be adjusted from three directions.

The reason why the arm 22 of the outer frame 11 is provided with the recess 22 whose inner surface 24 has a hemispherical shape is that the inner frame 12 is
Without fixing it with the thumbscrew 2 on the arm 17 of the outer frame 11.
This is to prevent the inner frame 12 from shifting even if the inner frame 12 is simply placed on the outer frame 11 with zero. When the arm 17 of the outer frame 11 is provided with the hemispherical recess 22 in this manner, even when the arm 17 of the outer frame 11 is inclined, the thumb screw 20 fits into the recess 22 and passes through the center 35 of the recess. Upright and its three thumbscrews 20 can be turned to level the upper perimeter 13 of the inner frame 12 and thus the ground 34
This is advantageous when is inclined.

The thumbscrew 20 adjusts the level (height) of the upper peripheral edge 13 of the inner frame 12 by aligning the upper peripheral edge 13 of the inner frame 12 horizontally and adjusting the length protruding from the arm 19. This is for adjusting to a predetermined level. This level and horizontal adjustment is performed while looking at the scale attached to the level measuring rod 15 mounted on the inner frame 12 and the bubble tube (level) mounted on the pedestal 14.

The mortar 32 is put into the opening 29 of the inner frame 12 whose level and level are aligned in this way, and the top 3
7 is fitted to the upper peripheral edge 13 of the inner frame 12, and the excess mortar generated at that time is scraped off from the upper peripheral edge 13 of the inner frame 12, and when the excess mortar is scraped, the top end 37 of the mortar surface plate 36 is flattened. Averaged.

After the mortar 32 is solidified, the mold 38 is removed, but the inner frame 12 that comes into close contact with the mortar 32 is removed.
When the inner diameter (A) of the upper peripheral edge 13 is made smaller than the inner diameter (B) of the lower peripheral edge 23 and the inner peripheral surface 25 of the inner frame 12 is formed into a conical shape, the mortar surface plate solidified and completed. 3
6 makes it easier to remove the inner frame 12. For that, inner frame 1
It is good to use a conical steel pipe (pipe) for 2; however, from one conical steel pipe, an inner frame 1 having a predetermined inner diameter (A) can be obtained.
2 can be obtained, and the other part of the conical steel pipe is
2 cannot be used, resulting in wasted material.

At this point, the inner frame 12 in which the inner peripheral surface 25 has a conical shape has the inner diameter A of the upper peripheral edge 13 smaller than the inner diameter B of the lower peripheral edge 23, and the inner peripheral surface 25 has a conical inner surface. Lumber 28
And the cylindrical outer surface member 27 to which the inner surface member 28 is fitted in close contact, and the inner surface member 28 is
It is recommended to manufacture by bending a plastic plate or plastic injection molding, especially foam molding using a foamed plastic such as styrene foam.

[0032]

As described above, according to the present invention (claim 1), the upper peripheral edge 13 of the inner frame 12 mounted on the outer frame 11 installed on the ground 34 is viewed from the level measuring rod 15 and the bubble tube 31. While leveling with the thumbscrew 20 and aligning it to a predetermined level, mortar 32 is thrown into the opening 29, and the excess mortar is simply scraped off from the upper peripheral edge 13 of the inner frame 12, so that the top 37 is leveled, A mortar surface plate 36 adjusted to a predetermined level is formed.

Therefore, in placing the mortar platen 36, it is not necessary to mark the level while moving the level measuring jig with the formwork 38 or to position the top by black ink. The inconvenience that the mark attached becomes difficult to see due to the mortar or the slag is eliminated, the iron of the mortar is easily pressed, and the top end 37 of the mortar surface plate does not become uneven (uneven).

The outer frame 11 can be fixed by striking the leg material 18 into the ground 34. In order to fix the form 38 to the ground 34, the outer frame 11 is covered with dirt or gravel around the form 38. It is no longer necessary to temporarily fix the mortar, for example.

Further, since the formwork 38 is composed of the round outer frame 11 and the inner formwork 12 having no directivity, the arrangement direction of the civil construction structure to be constructed thereon is mistaken depending on how the formwork 38 is installed. There is no need to say. As described above, the formwork 38 according to the present invention can quickly position the top end 37 without troublesome mounting and fixing on the ground 34, and accurately adjust the top end 37 to a predetermined level. And mortar surface plate 3
This is very convenient for placing 6 efficiently.

According to the present invention (claim 2), the distance (height) from the lower peripheral edge 23 of the inner frame 12 to the arm 19 is the distance from the upper peripheral edge 21 of the outer frame 11 to the projection (thumb screw) 16. (Height), the inner frame 12 is fitted into the outer frame 11 so that the inner frame 12 has three protrusions (thumb screws).
When the thumb screw 16 is turned, the inner frame 12 is locked to the outer frame 11, and the mold frame 38 including the outer frame 11 and the inner frame 12 is easily assembled.

According to the present invention (claim 3), the arm 17 of the outer frame 11 is provided with the recess 22 whose inner surface 24 has a hemispherical shape, and the thumbscrew 20 of the inner frame 12 fits into the recess 22. Therefore, the inner frame 12 is locked to the outer frame 11 without turning the thumbscrew 16, so that the outer frame 11 and the inner frame 12 can easily assemble the form 38, and the form 38 can be mounted on the inclined ground 34. Positioning, level, and level can be easily adjusted.

According to the present invention (claim 4), the inner diameter (A) of the upper peripheral edge 13 of the inner frame 12 is equal to the inner diameter (B) of the lower peripheral edge 23.
And the inner peripheral surface 25 of the inner frame 12 has a conical shape, so that the inner frame 12 is easily released from the solidified mortar surface plate 36. The inner frame 12 has a cylindrical outer surface material 27.
When the inner peripheral surface 25 of the inner peripheral member 28 is formed into a conical shape and formed by bending a plastic plate or plastic injection molding, Solidified mortar surface plate 3
From 6, it is possible to economically obtain a mold 38 from which the inner frame 12 can be easily removed. In addition, three projections 16 and three arms 17 and three leg members 18 of the outer frame 11 around the centers 33 and 33 'in each circular cross section of the outer frame 11 and the inner frame 12, and the inner frame Between the adjacent protrusions 16 of the 12 three arms 19
16, the central angles α, β, γ and α ', β' of the arms 17.17 and 19.19 between the arms and the 18.18 between the legs.
When γ ′ is set to 120 degrees, the outer frame 11 and the inner frame 12 are evenly supported from three directions and are stable, and the mold 38 can be easily assembled.

According to the present invention (claim 5), since the pedestal 14 is formed of a flat surface plate, it can be easily mounted on the inner frame 12, and the level measuring rod 15 is supported vertically on the pedestal 14. In addition, since the bubble tube 31 is attached to the pedestal 14, the positioning of the formwork 38, the level and the horizontality can be easily adjusted. When the three projections 16 of the outer frame 11 are formed by thumb screws screwed into screw holes penetrating from the outer peripheral surface of the outer frame 11 toward the inner peripheral surface, the length of the projections 16 is easily adjusted. By adjusting the length of the projection 16, the positioning of the inner frame 12 is facilitated, and the screw 2 screwed to the arm 19 of the inner frame 12 is used.
Since 0 is a thumbscrew, it is easy to turn.
By changing the distance between the arm and the arm 19, the level and the level of the inner frame 12 can be easily adjusted.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a procedure for assembling a mold according to the present invention.

FIG. 2 is a perspective view of a mold according to the present invention.

FIG. 3 is a perspective view of a mold according to the present invention.

FIG. 4 is a sectional view of a mold according to the present invention.

FIG. 5 is a perspective view of a mold according to the present invention.

FIG. 6 is a cross-sectional view of a main part of the mold according to the present invention.

FIG. 7 is a sectional view of a mold according to the present invention.

FIG. 8 is a perspective view showing a procedure for assembling the inner frame according to the present invention.

FIG. 9 is a sectional view of a mold according to the present invention.

FIG. 10 is a sectional view of a mortar surface plate according to the present invention.

FIG. 11 is a perspective view of a conventional mold.

FIG. 12 is a perspective view of a conventional mold.

[Explanation of symbols]

 Reference Signs List 11 outer frame 12 inner frame 13 upper peripheral edge of inner frame 14 pedestal 15 level measuring rod 16 protrusion (thumb screw) 17 arm of outer frame 18 leg material 19 arm of inner frame 20 screw of inner frame (thumb screw) 21 outer frame Upper rim 22 dent 23 lower rim of inner frame 24 inner surface of dent 25 inner surface of inner frame 26 outer frame opening 27 outer surface material 28 inner surface material 29 inner frame opening 30 outer surface of inner surface material 31 bubble tube 32 mortar 33 Center 34 Ground 35 Center of dent 36 Mortar surface plate 37 Top end 38 Formwork 39 Penetrating plate 40 Mortar installation space 41 Square formwork 42 Level measurement jig 43 Mark 44 Iron

Claims (5)

[Claims] (A) an outer frame (11) having a circular cross-sectional shape;
An inner frame (12) having a circular cross-sectional shape having an outer diameter smaller than the inner diameter of the outer frame (11), and a peripheral edge (13) of the inner frame (12).
(B) from the inner peripheral surface of the outer frame (11) to the center (33) in the circular cross section of the outer frame (11). (C) Three arms (1) are protruded from the outer peripheral surface of the outer frame (11) to the center (33) in the opposite direction.
7) protrudes, and (d) three leg members (18) protrude in parallel from the periphery of one side of the outer frame (11), and (e) the outer periphery of the inner frame (12). From the surface, three arms (19) protrude in the opposite direction to the center (33 ') of the circular section, and (f) the center (3) of the outer frame (11).
3) Three protrusions (16) around the three arms (1
7) and central angles (α, β) between two adjacent projections (16, 16), between arms (17, 17), and between legs (18, 18) of three leg members (18). Is less than 180 degrees and 9
Greater than 0 degrees (90 ° <α, β <180 °) and (g) 3 around the center (33 ') of the inner frame (12).
Arm (19) between two adjacent arms (19.1)
9) the central angles (α ′, β ′) are less than 180 degrees and greater than 90 degrees (90 ° <α ′, β ′ <180 °); (h)
The distance from the center (33 ') of the inner frame (12) to the tip of the arm (19) is larger than the radius of the outer periphery of the outer frame (11), and (i) two adjacent sets of the inner frame (12) The center angle (α ′, β ′) between the arms (19, 19) is equal to the outer frame (1).
1) The central angle (α, β) between two pairs of adjacent arms (17, 17) is equal to (α, β), and (j) a screw (20) is attached to each of the three arms (19) of the inner frame (12). (K) at least one projection (16) of the three projections (16) of the outer frame (11) is outside of the arm (19); A blackout formwork for laying a surface plate for civil engineering work, comprising a set screw screwed into a screw hole penetrating from an outer peripheral surface to an inner peripheral surface of the frame (11). 2. The inner frame (12) according to claim 1, wherein
Screws (2) protruding from each of the three arms (19)
The lower end of (0) is applied to the outer frame (11) by contacting the three arms (17) of the outer frame (11). ) From the upper peripheral edge (21) of the outer frame (11).
6), the inner frame (12) is fitted between the three projections (16) of the outer frame (11), and the three projections (16) A tip for pressing against the outer peripheral surface of the inner frame (12), and the inner frame (12) is locked to the outer frame (11) by the three projections (16). Ink marking formwork. 3. An indentation (2) whose inner surface (24) has a hemispherical shape in the arm (17) of the outer frame (11) according to claim 2.
2), and the inner frame (1) is provided in the recess (22).
2) A blackout formwork for laying a surface plate for civil engineering work, wherein a lower end of the screw (20) is fitted. 4. The inner frame (12) according to claim 2, wherein an inner diameter (A) of an upper peripheral edge (13) of the inner frame (12) is smaller than an inner diameter (B) of a lower peripheral edge (23). An ink-marking formwork for laying a surface plate for civil engineering work, wherein the inner peripheral surface (25) has a conical shape. 5. The pedestal (14) according to claim 1, wherein the pedestal (14) is formed of a flat platen, and a level measuring rod (15) is supported perpendicular to the pedestal (14).
4) An ink-out formwork for laying a surface plate for civil engineering work, characterized in that a bubble tube (31) is attached to 4).