JPS5912677Y2 - Rebar machining actual length slide rule - Google Patents

Description

[Detailed description of the invention] This invention allows to easily and accurately know the actual length of reinforcing bars (actual length of reinforcing bars) used in reinforced concrete buildings (including steel-framed reinforced concrete buildings) in a short time. Concerning a slide rule made like this.

．． In architectural design, it is required to estimate construction costs by accurately calculating the required quantities of various building materials that will be used in construction.

However, in the case of frame structure design drawings for reinforced concrete buildings, if explanatory drawings showing the reinforcement arrangement and assembly status of reinforcing bars were created for each part, each side, and each axial cross section of the building, the number of design drawings would be enormous, so it is not common practice to do so. In general, we only create reinforcement assembly and assembly drawings for representative or very general parts of a building, and for other parts, we draw foundations, columns, beams, etc.
The design details are expressed only by drawings of the walls, floor slabs, etc., and bar arrangement lists.

Therefore, in general, the true number of reinforcing bars to be incorporated into each member, ie, beam, column, plate, etc., can be easily read from the design drawings, but the actual length of each individual reinforcing bar is not recorded.

However, the amount of reinforcing bars required for construction is the total length of the reinforcing bars used in the building, which is the actual length of each reinforcing bar multiplied by the required number, and the total length of the reinforcing bars used in the building The total weight must be calculated by multiplying by the weight per unit.

In other words, calculating the actual length for each diameter and machining shape is a basic work and is also an essential work.

Furthermore, the reinforcing bars are JIS-G 3112, SR-2
4, SD-24, JIS-3117, SRR-2
4. Mainly standard materials such as SRD-24 are processed according to the design specifications and the reinforcing bar processing standards stipulated in the standard common specifications established by the Architectural Institute of Japan or the Ministry of Construction, etc., for example, as shown in Figures 1 to 8. As shown in the figure, the method of installing anchoring parts, hook parts, bent parts, joint parts, etc. differs depending on the part used, so only the span l of beams and floor slabs, the height of columns, the length of walls, etc. are uniform. It is not possible to calculate the actual machined length of reinforcing bars for each machined shape or diameter by simple calculations.

For example, the first. 4, 5, 6. Figure 8 shows the length of the anchoring part a (fixed length), Figures 1, 4, and 6 show the length of the hook part b (hook length), and Figures 1 and 5 show the horizontal extension of the bent part C. length, 8th
In the figure, the length of the joint portion d (joint length), etc. must be calculated, and then complex calculations must be performed along with the span l, column height, etc.

For these reasons, the required amount of reinforcing bars has traditionally been estimated by skilled engineers who are technically proficient in reinforcing bar structures, based on the processing standards described in the aforementioned common specifications. (length divided by the diameter of the reinforcing bar), hook coefficient (hook length divided by diameter), joint coefficient (
After calculating the fixation length, hook length, joint length, etc. using the value obtained by dividing the joint length by the diameter, etc., based on these values,
This is done by adding up the values of the span l or column height to calculate the actual length of the reinforcing bars. This has been done either by calculating the approximate actual length of the reinforcing bar, relying on intuition based on experience.

For this reason, this kind of work to estimate the amount of reinforcing bars (so-called "extracting" of reinforcing bars) requires a high level of specialized knowledge, and not only is the calculation extremely complex and takes a huge amount of time, but it also requires an accumulation of complicated calculations. Or, because it relies on intuition, the calculated values often vary greatly depending on the estimater, and are therefore less reliable.As a result, in the case of large-scale buildings, the results of calculations by each estimater can vary greatly. There were often cases where the estimated amount differed by several million yen.

This invention was developed based on the above-mentioned circumstances, and
To provide a slide rule that makes it possible to easily and accurately obtain the actual length of reinforcing bars in a short time without the need for complicated calculations based on the coefficients mentioned above, and that greatly facilitates the integration of the required amount of reinforcing bars. It is something to do.

Hereinafter, the outline of the present invention will be explained with reference to embodiments shown in the drawings.

Fig. 9a shows a reinforcing bar machining actual length slide rule (hereinafter simply referred to as slide rule) 10, which consists of three fixed rules 11,
12. 13, two sliding scales 14, 15, and the 14th
It is constituted by a cursor 16 shown in the figure.

The first slide measure 14 is fitted between the fixed measure 11 and the fixed measure 12, and the second slide measure 15 is fitted between the fixed measure 12 and the fixed measure 13 so as to be slidable in the longitudinal direction. There is.

The cursor 16 is moved to the fixed scale 11, 1 as shown in FIG. 9b.
2, 13, and sliders 14, 15 so as to be slidable in the longitudinal direction.

As shown in FIG. 9a, on the upper edge of the lower second sliding scale 15 there is a display 0 indicating O meters, 1 meter, 2 meters, . . . 10 meters starting from the origin O in the longitudinal direction. , 1, 2, ...... 10 scales increasing from left to right (hereinafter referred to as A scale) is a scale of a predetermined scale (for example, a standard metric scale). 1750 scale).

The lower edge of the fixed scale 12 (that is, the part facing and touching the upper edge of the second sliding scale 15 provided with the A scale) has a scale B (hereinafter referred to as B scale) that is exactly the same as the A scale. ) is provided.

The A scale indicates the actual length of the reinforcing bar to be processed, and the B scale indicates the span l of the beam or wall or the height of the column or wall where the reinforcing bar is used.

A first index C1 is located near the left end of the first sliding scale 14.
(hereinafter referred to as C1 scale) is provided, and a second index C2 (hereinafter referred to as C2 scale) is provided to the right of this 01 scale.

01 shaku mainly consists of the length of the anchoring part a (for example, anchoring part a in Figures 1.4, 5, and 6.8) at the point receiving the tensile force (anchoring length) and the joint section d (the anchoring length) at the point receiving the tensile force. It is an index of the joint length), and is determined by the reinforcing bar processing standards to be at least 40 times the diameter of the reinforcing bar.

02 scale mainly refers to the length of the fixed part a at the point receiving the compressive force (fixed length) and the length of the joint part d at the point receiving the compressive force (for example, the joint part d in Fig. 8) (joint length). This anchorage or joint length is determined by the reinforcing bar processing standards to be at least 30 times the reinforcing bar diameter.

Therefore, the diameter of reinforcing bars normally used for C1 scale is 9, 13
, 16, 19, 22, 25, 28 millimeters 40 times the length, scaled to 1/ mark as in the A scale and B scale, are lined up in order from top to bottom, and the vertical line on the right (a line perpendicular to the first sliding scale 14) as the starting point,
The cursor line is drawn to the left, and a short vertical vertical line is provided at the left tip of each line, and the hook scale J on both sides of the cursor line, which will be described later, is drawn to the left.
When used in combination with J2 (FIG. 14), it has the effect of making it easier to see and reducing errors.

02 shaku has diameters of 9, 13, 16, 19, 22,
25, 28 mm 30 times the same < 1/5
Lines with lengths set to 0 are arranged in order from top to bottom, with the vertical line on the right as the starting point.

Also, a short vertical vertical line is provided at the left tip of each line, similar to the C1 scale, to obtain the same effect as the C1 scale tip.

Furthermore, index points 20 times and 15 times the diameter of each reinforcing bar are provided at the midpoints of each line for both C1 and C2 measures, and short vertical vertical lines are provided at the tip of each line.

This index point is the joint center position (Fig. 8) in the case of reinforcement spanning between consecutive beams (Fig.
(point and "ni" point) or 40 times the joint length,
This is applied when a fixation or joint coefficient other than 30 times is specified in the design specifications (for example, civil engineering work, etc.).
Usually, the joint or anchorage factor of reinforcing bars is a multiple of 5 (for example, 20, 25, 30, 35) relative to the diameter of the reinforcing bars used.
.
It is now possible to find all lengths of multiples of 5 up to 5 times.

Further, as shown in FIG. 9, near the right end of the first sliding scale 14, a C2' scale is provided, which is the C2 scale drawn in the opposite direction with respect to the vertical line, and furthermore, the left inner side of this C2' scale is provided. is provided with a CI' scale, which is a C1 scale drawn in the opposite direction to the vertical line.

A third indicator (hereinafter referred to as C3 scale) is provided at a position on the right side of the 02 scale of the first sliding scale 14.

This C3 scale is for indicating the extension length.

As shown in Figures 1 and 5, the extension length is the point near the recursion point of the beam or deck slab (a position closer to the inside of the beam gap 1 1/4-m?tL from the support points at both ends of the beam or deck slab). Alternatively, from the length of the bending part C of the bending line (pen-up line) at the top and bottom of the slab cross section where the stress reverses between the tension side and the compression side, the horizontal length of this bending part C. This is the value obtained by subtracting H.

Since this bent portion C is inclined at 45 degrees with respect to the horizontal direction in terms of structural theory, its extension length is the length of BD, that is, (v7-1)H, as shown in FIG.

Note that H indicates Liang Kai (Harise).

For 03 shaku, the beam or H is 0.6, 0.7, 0.8,...
・・・・・・(v'!-1)H for 2.0 meters
is shaped to the right with the starting point on the left side using a scale scaled down to 1/50 of the length of rl. OJ r2. The OJ number is written on it.

As shown in FIG. 9, at a position between the C3 scale and the CI' scale, there is an index C3' or lower C3' with a scale twice as large as the 03 scale.
(written as shaku) is provided.

This is the total length of the two bends (v'T-1) when there are two bends on the left and right as shown in Figure 5.
)H.

The cursor 16 is provided with a vertical cursor line K in the center as shown in FIG. J2 shaku) is provided.

Hooks are usually provided to increase the adhesion stress between reinforcing bars and concrete when round steel is used, and are rarely provided in the case of deformed reinforcing bars that have irregularities on the surface of the reinforcing bars.

These J1 shaku and J2 shaku have diameters of 9, 13, 16, and 19.
, 22, 25, and 28 mm round steel are drawn in order from top to bottom. 50 scale.

The hook coefficient for a diameter of 9 mm is 8.71, and the hook coefficient for a diameter of 13 mm or more is 10.2.
It is 8.

Note that the upper and lower arrangement intervals of these hook length indicators for each diameter and the arrangement with the cursor 16 are as follows when the cursor is attached to the slide rule 10: 01 shaku, 01' shaku, 02 shaku, C
Arrange it so that it matches the 2'-shaku position.

In addition, a short vertical vertical line is provided at the tip of each diameter indicator line of this hook length indicator, making it easier to read when used in conjunction with other indicator scales, and reducing operational errors. The provision is as described above.

Furthermore, a Mannheim scale L is provided on the lower edge of the sliding scale 15 and on the upper edge of the fixed scale 13, and a Mannheim scale L is provided on the lower edge of the fixed scale 13. Fixed scale 1 at the approximate point of weight per meter of round steel for each diameter from 9 mm to 28 mm with respect to the scale.
A short vertical line is drawn perpendicular to 3, and the diameter of the reinforcing bar corresponding to that vertical line is indicated (9φ, 13φ,
...28φ) is attached.

Next, these A shaku, B shaku, C1 shaku, 01' shaku, C2 shaku,
A method for obtaining the actual length of reinforcing bar machining will be explained using C2' scale, C3 scale, C3' scale, J1 scale, J2 scale, and cursor line K.

Example-1 As shown in Fig. 4, the actual length of the main beam reinforcement of a reinforcing bar that has anchor portions a and hook portions b at both left and right ends (span l = 4.
5m, diameter of reinforcing bar 19 mm, fixation factor 40) In the case of manual calculation (span) + (length of 2 hooks) + (length of 2 fixations) = 4.5 + 0.019xlO. 28x 2 +0
．． 019 x 40 Align with cursor line K.

Operation-2 As shown in Fig. 15, slide the cursor 16 to the left and select the tip of the C1 scale of the slide measure 14 for a diameter of 19 mm and the tip of the J2 scale on the right marked on the cursor 16 for a diameter of 19 mm. Match the parts.

(Fixing length on the left side + hook length on the left side) Operation-3 As shown in Figure 16, slide the second sliding scale 15 to the left to align the 0 point of the A scale with the cursor line of the cursor 16. .

Operation-4 Slide the cursor 16 to the right as shown by the dotted line in FIG. 16 to align the cursor line K with the scale 4.5 of the B scale of the fixed scale 12.

(Span) Operation-5 As shown in Fig. 17, slide the first slide 14 to the left,
Align the starting line of CI' scale with cursor line K.

Operation-6 Slide the cursor 16 to the right as shown in FIG. 18, and align the 19 mm tip of the J1 scale on the left side of the cursor line K with the 19 mm diameter tip of the CI' scale.

(Right side anchor length + right side hook length) If scale scale A on the sliding scale 15 of the cursor line K is read at this time, the actual machined length of the reinforcing bar in Fig. 4 is 6.42 meters.

Therefore, the error from the manual calculation described above is only 1 centimeter.

Example-2 As shown in Figure 5, the actual length of a bent deformed reinforcing bar that has two fixed parts and a bent part (span l = 6 m, diameter 25
mm, beam h=Q. gm) In the case of manual calculation (span) + (extended length of the bent part at 2 locations) + (length at 2 fixed locations) = 6 + (-%n'''-1) xo.sx2
+0.025. X 40

Operation-2 Slide the cursor 16 to the left as shown in Figure 19, and align the cursor line K with the tip of the C1 scale for a diameter of 25 mm.

(Fixing length on the left side) Operation-3 As shown in FIG. 20, slide the second sliding scale 15 to the left to align the "0" point of the A scale with the cursor line.

Operation-4 It is shown by the dotted line in Figure 20. Then, slide the cursor 16 to the right and align the cursor line K with 6 on the B scale at the lower edge of the fixed scale 12.

? Work-5 As shown in Figure 21, G. Slide the sliding scale 14 to the right and align the 0 point of the C3' scale of the sliding scale 14 with the cursor line K.

Operation-6 Slide the cursor 16 to the right as shown in Figure 22 and press C.
Align 0.8 (beam) of 3' scale with cursor line K.

(Extended length of two bent parts c and c) Operation-7
．． As shown in FIG. 23, slide the first slider 14 to the left,
Align the starting end of CI' scale with cursor line K.

Operation-8 Slide the cursor 16 to the right as shown in Figure 24, and press C.
Align the 25 mm diameter tip of the I' scale with the Garsol line K.

(Fixed length on the right side) At this time, if you read the scale that the cursor line K points to scale A, the actual machining length of the deformed reinforcing bar in Fig. 5 is 8.
Get 67 meters.

The error from manual calculation is 0. As is clear from the explanations of Examples 1 and 2 above, this slide rule allows fixing lengths for each diameter of the reinforcing bars that are calculated in advance and written on the slide rule 14 at the same scale, and The actual machining length is obtained by adding the pick length, extension length, etc. to the span length.

Therefore, there is no need to perform complicated calculations each time as in manual calculations, and the cursor 16 and sliding scales 14 and 15 are simply added mechanically as the reinforcing bars are processed from left to right. Since it is automatically added to the length A, there is an advantage that the relationship between the front and back is not interrupted unlike with other calculation methods, and the actual length to be machined can be easily determined.

Also, as shown in Figure 8, in the case of reinforcing bars with a joint part d, C1 scale or C2 scale, CI' scale, and 02' scale are used, depending on the situation where it is used on the compression side or the tension side. Just add it up.

In addition to the scale scale and length index mentioned above, the slide rule of this invention has a
As shown in the figure, it has the following scale divisions.

On the upper edge of the fixed scale 12, the origin coincides with the origin of the scale scale B, and the scale is B scale V4 (Kosawata penetration length scale D (
(hereinafter referred to as D scale) is provided.

This D scale is a scale mainly used to calculate the end reinforcement (top reinforcement) of a beam or deck slab, and the part where the end reinforcement bar penetrates into the beam or deck (e in Figures 1 and 6). It is used to index the length, and also to calculate the distance to the beam recursion point in the case of bent reinforcements, or to calculate the installation range of the center position of the lower end reinforcement joint.
There is.

According to the rigid frame structure theory, the beam recursion point is located closer to the center of the span distance than both ends of the beam, so the length of the span DL/i is set to the scale shown. It has a closed scale (that is, V4 reduction of A scale and B scale).

The case of using this D scale will be explained in the following example.

Example-3 As shown in Figure 6, the actual length of the top muscle (span l = 7m,
Round steel diameter: 22 mm) In the case of manual calculation (length of penetration part) + (fixed length on left side) + (length of penetration extension part P on right side) + (length of left and right hooks)
-7 x l/i +0.022 x40+0.022
x 15+0.022X10.28X 2=3.41
When using a metric slide rule (see Figures 25 to 29) Operation-1 A scale of slide rule 15, B scale of fixed rule 12, each origin 0
and the starting end of the C1 scale of the sliding scale 14.

Operation-2. As shown in FIG. 25, slide the cursor 16 to the left to align the 40x tip of the C1 scale with a diameter of 22 mm and the 22 mm diameter tip of the J2 scale on the right side of the cursor line K.

(Left fixation length + left hook length.) Operation-3 Slide the sliding scale 15 to the left as shown in FIG. 26, so that the O point of the scale A matches the cursor line K.

Operation-4 Slide the cursor 16 to the right as shown in FIG. 27, and align the cursor line K with the 7 mark on the D scale of the fixed scale 12.

Operation-5 Slide the first slider 14 to the right as shown in Fig. 28.
Align the cursor line K with the point that indicates the middle scale of two 22 mm bars, that is, the length 15 times the reinforcing bar diameter.

(Length of increased penetration portion P) Operation-6 As shown in Fig. 29, slide the cursor 16 to the right,
Align the starting line of C2 shaku with the tip of the 22 mm muscle of J1 shaku on the left side of the cursor line.

(Right-side hook length) At this time, if the scale indicated by the cursor line K on scale A is read, the actual machined length of the reinforcing bar in FIG. 6 is 3.42 meters.

The error from manual calculation is only 1 centimeter.

At a position intermediate between the upper edge and the lower edge of the second slider 15,
As shown in FIG. 9, a scale division E (hereinafter referred to as E scale) is provided, and a 10th scale division is provided approximately in the middle of the back surface of the first sliding scale 14.
As shown in the figure, scale divisions F and F' (hereinafter referred to as F scale and F' scale) are provided vertically opposite to each other, and scale divisions F and F' (hereinafter referred to as F scale and F' scale) are provided. F scale and F' scale are used to calculate the length of the four sides of the concrete cross section of the beam or column in relation to E scale, and at the same time add the lengths of the four sides of the concrete cross section of the beam or column (see Figure 2). ) and stirrups (third
This is a scale division that indicates the actual machining length of (Figure).

Also, using the E scale of the sliding scale 15, add the lengths of the two sides of the cross section of the beam or column, and add the result to the F scale or F' on the back of the sliding scale 14.
To transmit the information to the shaku, the cursor line and the starting line of C1 shaku on the surface scale of the sliding scale 14 are used together.

That is, by aligning the cursor line K with the index point indicating the sum of two sides on the E scale and sliding the slide scale 14 so that the starting line of 01 scale coincides with the upper part of the cursor line, it is set on the back surface of the slide scale 14. As the sliding scale 14 moves, the F scale and F' scale also change to E.
It can be moved by the required length to a position related to the shaku.

Also, on the back side of the slide rule main body 10, F on the back side of the first slide rule 14.
As shown in FIG. 11, near the origin 0 of the shaku and F' shaku, there is a rectangular window 1 through which the origin O of the F shaku and F' shaku can be seen.
7 is provided.

The width of the top and bottom of this window 17 is approximately 1.4 cm, the width of the left and right is approximately 3 cm, and the origin O of the F scale and F' scale is slightly to the right of the window 17 (1 cm from the right edge).
This window 17 is provided so as to be positioned.

(FIG. 11 shows the slide rule 10 upside down and turned over.

) The E scale has its starting point at the same location as the origin O of the A scale, and is a scale division that continues to the right from the origin 0 to a 2.5 meter marking point at a scale of 1/20 of the normal metric system.

Also, the origin of the F scale and F' scale on the back side of the sliding scale 14 is the fixed scale 12.
The position where the margin width m', which is the same width as the horizontal width m of the left margin of the B scale, is taken on the right side of the back of the sliding scale 14 is set as the origin 0, and the scale divisions continue to the left from this point to a maximum of 7 meters. The scale is 1/40 of the normal metric system.

(The above "right" and "left" refer to the case where the sliding scale 14 is turned upside down and turned over.

), that is, the scale is even twice the E scale. F scale and F' scale are both drawn to the exact same scale, with F scale indicating hoops on the lower side, and F' scale indicating stirrups on the lower side.

The reading number should be placed between F and F', and the corresponding number 1, 2, 7, etc. should be written for each meter.

(Figure 10) As shown in Figures 2 and 3, both ties and stirrups are provided inside the cross section of the column or beam by the concrete covering T, and hook portions R are provided at the starting and ending ends of the reinforcing bars. There are one (Fig. 2) or four (Fig. 3) locations.

Therefore, the actual processed length of the ties and stirrups is (length of two sides x 2) + (length of hook portion) - (covering thickness x 8).

However, as mentioned above, the length of the hook part is the diameter multiplied by the hook coefficient, and the results of pre-calculating the latter half + (length of the hook part) - (coating thickness x 8) are shown in Tables 1 and 2.
As shown in , when using 9 mm diameter bars, -80 mm for stirrups, 80 mm for stirrups, 30 mm for stirrups when using 13 mm diameter bars, 300 mm for stirrups, and 300 mm for stirrups, and when using 16 mm diameter bars. Add 90 mm for ties and 420 mm for stirrups to the total length of the four sides.

Therefore, as shown in FIGS. 11 and 12, the window 17 on the back of the main body
On the lower edge of the screen, write the length of 1/40 scale of the length corresponding to the addition/subtraction value of reinforcing bars for each diameter of 9 mm, 13 mm, and 16 mm in the case of stirrup bars, centering on the origin 0. If you read the index value of F scale corresponding to E
The actual machined length of the stirrup bar corresponding to the sum of the two adjacent sides of the column cross section added by the length can be immediately obtained.

Similarly, No. 11. As shown in Figure 12, on the upper edge of the window 17, write the length of 1740 scale corresponding to the added value for each diameter in the case of stirrups, with respect to the origin 0, and write the corresponding F By reading the index value of 'scale', the actual machined length of the stirrup corresponding to the sum of two adjacent sides of the beam cross section added at E scale can be obtained.

In any of the above cases, it is sufficient to read the scale appearing in the window 17 on the back side of the slide rule while the slide scale 14 is still used for other display purposes.

The case of using E scale and F scale will be explained using the following example.

Example-4 Actual length of reinforcing bars shown in Figure 2 (Length of one side of a square column cross section is 20.5 m, reinforcing bars with diameter of 9 mm, concrete covering of 3 cm) In the case of manual calculation (Length of two sides X2) + (Length of hook part) - (Coating thickness x 8 ) = { (0.5 + 0.5) x 2 ) +
(0.009x8.71x2) - (0.03x8)=
1. When using a 29-meter slide rule (see Figures 30 to 34) Operation-1 Align the start lines of the E scale on the slide rule 15 and the 01 scale on the slide rule 12 to the O point, respectively.

Operation-2 Slide the cursor 16 as shown in FIG. 30 to align the cursor line K with the scale 0.5 on the E scale.

Operation-3 As shown in FIG. 31, slide the sliding scale 15 to the right to align the O point on the E scale with the cursor line K.

Operation-4 As shown in FIG. 32, slide the cursor 16 to the right to align the cursor line K with the scale 0.5 on the E scale in the same way as in operation-2.

Operation-5 Slide the sliding scale 14 to the right as shown in Fig. 33, and
Align the right start line of the shaku with the cursor line K.

By the operations so far, 4 of the concrete cross section of the column in question
This means that a total of 2 meters of side length was obtained on the F scale of the back side of the sliding scale 14.

Operation-6 As shown in Figure 34, the scale on the F scale shown in the window 17 corresponds to the index scale of the 9 mm diameter streak written on the lower edge of the window 17 on the back of the slide rule. Read and obtain the actual processed length of the column reinforcement of 1.92 meters.

Note that the actual machined length in the case of hoops with a diameter of 13 mm used in the same cross section can be read as 2.03 meters from the scale on the F scale corresponding to the 13 mm muscle index scale.

In the case of the stirrups in Figure 3, the same operation as in Example 4 is performed, and the F corresponding to the index for each diameter written on the upper edge of the back window 17 is
'By reading the scale on the scale, you can easily obtain the actual length of the stirrup.

An H scale scale is provided on the lower edge of the fixed scale 11, and a G scale scale, which is the same as the H scale scale, is provided on the upper edge of the sliding scale 14.

These H scale scale and G scale scale are used to calculate the length of diagonal reinforcement on foundation bases, the length of wall horizontal reinforcement in buildings with partial corner cuts, the length between beams of diagonal beams, the length of wall cross reinforcement, etc. As shown in Figure 7, the actual machined length of the reinforcing bar in the diagonal direction can be found from the lengths of the two sides, and from the origin 0 to the right 1
, 2, 3, . . . are placed at positions proportional to the square of each value.

The case of using H scale and G scale will be explained in Example-5.

Example-5 Actual length of reinforcing bars shown in Figure 7 (width = 4.5 m, ? = 3
m) Note that in this example, hooks at both ends are not required since the reinforcing bars are deformed.

Therefore, the actual machining length can be determined regardless of the reinforcing bar diameter.

Operation-1 Slide the cursor 16 to the right as shown in Fig. 35,
Place cursor line K on scale 3 on H scale.

Operation-2 Similarly, as shown in FIG. 35, slide the sliding scale 14 to the right to align the 0 point of the G scale with the cursor line K.

Operation-3 Slide the cursor 16 to the right as shown by the dotted line in Figure 35, align the cursor line K with the scale 4.5 on the G scale, read the scale that the cursor line points to on the H scale, Diagonal length 5.4
Get 1 meter.

Operation-4 The thickness of the foundation reinforcing bars in contact with the soil is specified as 60 mm, so the thickness is 5.41-0.06X2.
= 5.29 meters is the actual length in the case of deformed steel.

In addition, when using round steel, each end has hooks, so in addition to the 5.29 meters obtained by the above operation, add the starting line of A and B scale and C2 scale or C2' scale, and J1 scale on both sides of the cursor line. If you use J2 shaku together, you can easily find the actual machining length.

Next, as an example of a special use of the slide rule of this invention,
10. up to 0 meters. Using the decimal scale division, we can calculate the actual reinforcement of beams or slab reinforcements in the so-called "joint reinforcement arrangement" that spans between multiple consecutive beams as shown in Figure 8, which is generally considered to be the most difficult problem in reinforcing bar estimation. Let's explain long calculation.

(First span l1 = 5.5 m, second span 1 = 5 m
1 Column width of intermediate support frame w=Q. (5 m, diameter of deformed reinforcing bar 25 mm) In this example, the reinforcing bar length also exceeds the standard length on the market, so a joint must be provided in the middle.

The joint position and joint length are specified in the aforementioned common specifications or processing standards, or are specified depending on the design drawing, but in general, the joint position is within the allowable range of the standard length. If it is provided on the compression side within this range, the length of the joint will be 30 times the diameter, which is advantageous in terms of economy and is said to be safe in terms of stress.

Operation-1 As a preparatory operation, the following distances for each section are calculated.

This depends on extremely simple arithmetic calculations.

(1) From the starting end to the center position of the first joint (i) to (ro)
Section distance 6.500 ÷ 2 = 3.250 meters (2) From the starting end to the second joint center position (i) to (ni)
Section distance 6.500+0.500+5.000X1/2 =9,
500 meters (3) From the starting end to the end of the second beam (
I)~(E) Section distance 6.500+0.500+5.000=12.000 meters Operation-2 Align the origin O of A scale and B scale with the starting line of the first C1 scale.

Operation-3 Slide the cursor 16 to the left as shown in FIG. 36, and align the cursor line K with the 40x tip of the 25 mm muscle of the C1 length of the first sliding scale 14.

(Left end fixing length) Operation-4 As shown in FIG. 37, slide the second sliding scale 15 to the left to align the 0 point of the A scale with the cursor line K.

Operation-5 Slide the cursor 16 to the right as shown by the dotted line in Fig. 37, and place the cursor line K on the scale 3.25 on the fixed scale 120B.
Match.

((I) ~ (RO) section distance) Operation-6 As shown in Fig. 38, slide the first sliding scale 14 to the right and move the cursor to the 15x index point of the 25 mm muscle on the 02 scale. Match line K.

(Length of the fork of the joint part) Operation-7 Slide the cursor 16 to the right as shown by the dotted line in Fig. 38, and align the cursor line K with the starting end line of the C2 scale.

At this time, the 4.61 indicated by the cursor line K on the scale A is the actual length of the first reinforcing bar N1, 4661 meters.

Operation-8 However, in this case, in order to make effective use of the standard length of 5 meters of reinforcing bars and reduce scrap, we considered a range in which the joint position would not move significantly from the vicinity of the center between the beams.
In order to set the actual length of the first reinforcing bar to be 5 meters, move the cursor 16 to align the cursor line K with the 5 meter index point on scale A, as shown in FIG.

Operation-9 As shown in Fig. 39, slide the first slider 14 to the right,
Align the starting line of 02 shaku with cursor line K.

Next, the calculation of the second reinforcing bar is started, and the second reinforcing bar is arranged in the section from the first joint to the second joint.

The extended distance between the beams from the starting end of the first beam to the second joint position is within the range of B scale because the section (i) to (ni) is 9.5 meters according to (2) of "Operation-1". It can be calculated by

Operation-10 As shown in Figure 40, slide the cursor 16 to the left to align the cursor line K with the 30x tip of the 25 mm rebar on the C2 scale, and mark the overlapping position of the second reinforcing bar. and at the same time determine the starting point of the reinforcing bar.

(Length of left side joint of second reinforcing bar N2) Operation-11 As shown in FIG. 40, slide the second sliding scale 15 to the right to align the origin O of the A scale with the cursor line.

That is, the 0 point of scale A is moved to the starting point of the second reinforcing bar N2.

(A in Figure 40 moves to left A) Operation-12 As shown in Figure 41, slide the cursor 16 to the right,
If you move the cursor to 9.5 on the B scale and set the section distance (i) to (ni) on the B scale, in step -5, set the section distance r3.25J on the B scale. Therefore, the scale indicated by the cursor line K on the scale A is the length of the second reinforcing bar N2 (that is, the value obtained by adding the overlapping margin at both ends to the section distance from (ro) to (ni)).

It was determined that this index position was approximately 6 meters to 6.5 meters long, and in order to effectively utilize the standard length of 6 meters and avoid producing scrap parts, the second
The length of the main reinforcing bar is determined to be 6 meters, and as shown in Fig. 42, slide the cursor 16 to the left and move
Place the cursor line K at and determine the end of the second reinforcing bar.

Operation-13 As shown in Fig. 43, slide the sliding scale 14 to the left and
2' Align the 30x tip of the 25 mm diameter bar with the cursor line K.

Operation-14 Slide the cursor 16 to the left as shown by the dotted line in Figure 43, align the cursor line K with the starting line of C2' scale, measure the overlapping length of the second and third reinforcing bars, and simultaneously Determine the starting point for the third reinforcing bar.

By the above operating procedure, the starting end of the third reinforcing bar is set at around 8.5 meters on the B scale.

However, since the maximum index value on the B scale is up to 10 meters, step 11 is performed using the scale 8.5 on the B scale as the base point.
If you align the O point of scale A with scale 8.5 of scale B as shown,
If the reinforcement is placed in succession with the third or even fourth reinforcement, it will be impossible to calculate.

That is, as shown in the explanatory diagram in Figure 44, the point separated by the total length S of the second reinforcing bar from the origin "O" of the B scale is defined as "Wa", and "Wa" is the maximum index of the B scale. When the point is close to 10 (the "ka" point), the distance between the "wa" point and the "ka" point is (10-
S).

If we now align the origin O (Yo point) of A scale with the W point of B scale, A scale is the same scale as B scale, and the maximum index value is also B.
The maximum index value of B scale is 10 (because it is up to 10 like shaku)
The distance between the point "ta" on the A scale, which corresponds to "ka"), and the maximum index value of 10 ("re") on the A scale shows the same distance S as between "o" and "wa" on the B scale. It turns out.

At this time, (10-S) is an extremely short distance, so the A scale, which indicates the actual length of the third and subsequent reinforcing bars, protrudes to the right from the maximum marking point 10 (``ka'') of the B scale. , calculation is impossible.

Therefore, as shown in Fig. 45, the sliding scale 15 (A scale) indicating the actual length of the reinforcing bar is slid to the left, and the maximum indicated value of A scale is 10.
If we match (“re”) with the “wa” point of B-shaku, the distance between “ta” and “re” is S as mentioned above, so “ta” of A-shaku
The point coincides with the origin "O" of the B scale, so rlO-Sj
The distance moves to the left outer part of B scale, as shown by ``yo'' to ``ta'' in Fig. 45.

Therefore, by reading the origin 0 of the B scale, that is, the "o" point, as "10", the length between the beams exceeding 10 meters (
10+X) meters will be indexed as X meters on the B scale.

Therefore, by doing this, the lengths of the third and subsequent reinforcing bars can also be calculated.

So continue with the next step.

Operation-15 As shown in FIG. 46, slide the second sliding scale 15 to the left to align 10 of scale A with cursor line K.

Operation-16 As shown in FIG. 47, slide the cursor 16 to the left to align the cursor line K with the scale 2 on the B scale.

[(i) ~ (ho) section distance 12 meters, i.e. (10+
2) meters.

[Operation-17] As shown in FIG. 48, slide the first sliding scale 14 to the right and align the 40x tip of the C1 scale for the 25 mm muscle with the cursor line K.

(Fixed length at the right end end) Operation-18 As shown by the dotted line in Fig. 48, slide the cursor 16 to the right to align the cursor line K with the starting end line of 01 shaku, and the cursor line K becomes the index. 4.49 on the A scale represents the actual length of the third reinforcing bar, 4.49 meters.

In the above manner, we can calculate the distance of 5 meters for the first line, 6 meters for the second line, and 4.49 meters for the third line.

Furthermore, in the case of a fourth, fifth, etc., it is possible to calculate one after another while keeping the continuous appearance by repeating the above operation.

The above example shows how to calculate the actual machined length of reinforcing bars, but it is not limited to these examples; by combining these scales and indicators, calculations can be easily made in all cases of normal reinforcement arrangement. In addition, it can be applied not only to construction, but also to reinforcement in civil engineering work.

As mentioned above, the present invention is equipped with a fixed scale, two sliding scales, and a cursor, and various scale divisions and indicators are provided on the fixed scale, sliding scale, and cursor.
Calculating the actual length of reinforcing bars, which was previously done by complicated calculations, can now be done simply, quickly, accurately, and mechanically.

[Brief explanation of the drawing]

Figures 1 to 8 show the arrangement of various reinforcing bars. FIG. 9 is a plan view of the slide rule of the present invention, where FIG. 9a shows the state with the cursor removed and FIG. 9b shows the state with the cursor attached. Figure 10 is a diagram showing the scale scale on the back of the second sliding scale. 1st
Figure 1 is a back plan view showing the back side of the slide rule, Figure 12 is the 11th
FIG. 13 is a diagram for explaining the extension length of the reinforcing bar due to the bent portion, FIG. 14 is a plan view showing the cursor, and FIGS. 15-43. Figures 46 to 48 are diagrams showing examples of use of the slide rule of the present invention, and Figure 44. Fig. 45 is an explanatory diagram for calculating the actual length of reinforcement reinforcement. 10...slide rule, 11, 12, 13...
...Fixed scale, 14...First sliding scale, 15...
...Second sliding scale, 16...Cursor, 17
...Window, K...Cursor line, C1...
...First indicator, C2...Second indicator, C
3...Third index, J1, J2...Hook length index.

Claims (1)

[Claims for Utility Model Registration] First, second, and third fixed lengths 11, 12, parallel to each other;
13; first and second fixed scales 11. A first sliding rod 14 is fitted between the second and third fixed rods 12 and 12 so as to be slidable in the longitudinal direction; and a second sliding rod 15 is fitted between the second and third fixed rods 12 and 13 so as to be slidable in the longitudinal direction. and; a cursor 16 that is attached to a transparent plate having a vertical cursor line X so as to be slidable in the longitudinal direction so as to cover the upper surfaces of the fixed scales 11, 12, 13 and the slide scales 14, 15; On the mutually touching edges of the scale 12 and the second sliding scale 15, there are scale scales B and A that are the same in the longitudinal direction and zero on the left side.
are provided on the first sliding scale 14; length indicators having 40 times the reinforcing bar diameter on the same scale as the scale scales A and B are extended to the left and right from the vertical line as the starting point; 01 shaku and C'1 shaku displayed vertically shifted for each type of reinforcing bar diameter: Length index with 30 times the reinforcing bar diameter scaled to the same scale as the scale scales A and B, and the vertical line C2 is displayed as the starting end, extending to the left and right, and being shifted vertically for each of multiple types of reinforcing bar diameters.
Shaku and C'2 shaku: (v/T-1) for each type of beam H
A C3 scale in which the length of H is displayed on the same scale as the scale scales A and B in the longitudinal direction, and a C'3 scale in which the length is displayed at twice the scale of the 03 scale are provided; a transparent plate of the cursor 16; Then, extend the length index, which is the length obtained by multiplying the reinforcing bar diameter by the hook coefficient, to the same scale as the scale scales A and B, starting from the cursor line K and extend it to the left and right, and vertically for each reinforcing bar diameter. J1 shaku and J2 shaku are displayed with their positions shifted; Starting from the zero point of the scale B of the second fixed scale 12, the C1 shaku or 02 shaku of the first sliding scale 14 or the cursor 16 are provided.
Slide the second sliding scale 15 to the left by the length in the left direction from the zero point obtained using the J1 scale of
The reinforcing bar span length is taken to the right from the zero point of the scale scale B, and the span length point on the scale scale B is the starting point.
The C'1 scale, C'2 scale, C3 scale, or C'3 scale of the slide scale 14 corresponds to the length tip point in the right direction obtained using the J2 scale of the cursor 16. A slide rule for the actual length of reinforcing bars, characterized in that the actual length of reinforcing bars is obtained by the scale scale A.