CN102226680A

CN102226680A - Bend steel bar inner arc radius measuring pair ruler

Info

Publication number: CN102226680A
Application number: CN 201110088246
Authority: CN
Inventors: 唐才均
Original assignee: LIAONING BRANCH ZHONGTIAN CONSTRUCTION GROUP CO Ltd
Current assignee: LIAONING BRANCH ZHONGTIAN CONSTRUCTION GROUP CO Ltd
Priority date: 2011-04-09
Filing date: 2011-04-09
Publication date: 2011-10-26

Abstract

The invention provides a bend steel bar inner arc radius measuring pair ruler which comprises a pair of cross rulers made of transparent material. Vertical scales of the cross rulers are respectively at a left and a right side of the vertical rulers, and horizontal scales are at lower sides of horizontal rulers. The vertical and horizontal scales of each cross ruler extend from their intersections upward downward leftward and rightward. Vertical ruler scales intersections of the cross rulers are utilized to obtain a center of circle of a steel bar bend arc. Once the center of circle is determined, bend arc internal diameter is easy to read. The bend steel bar inner arc radius measuring pair ruler in the invention has a simple structure, and the measuring method is simple and accurate.

Description

Bending reinforcing bar inner arc radius measurement is to chi

[technical field]

The present invention relates to a kind of surveying instrument for building, the measurement that refers in particular to the bending radius of measuring building bar is to chi.

[background technology]

We know that there is certain requirement in our country to building bar after bending, its crooked internal diameter R 〉=4d (diameter of reinforcing bar).At present, be to come its radius of chosen in advance when practical application by the axle size of going for a stroll on the angle bender, whether the reinforcing bar internal diameter after curved good meets the requirements and does not have special instrument or equipment to detect at present, and the applicant has developed a kind of simple in structure but measure a pair of accurately dip stick specially for this reason.

[summary of the invention]

The objective of the invention is to be to overcome the deficiencies in the prior art, provide a kind of simple in structure, measure and to bend reinforcing bar inner arc radius measurement accurately chi.

In order to solve the technical matters of above-mentioned existence, the present invention takes following technical proposals:

A kind of bending reinforcing bar inner arc radius measurement is to chi, it includes a pair of Cross ruler of being made by transparent material, this lays respectively at the right side, the left side of linear foot to vertical scale of Cross ruler, laterally scale all is positioned at the crossfoot downside, the vertical, horizontal scale of each Cross ruler the intersection of their scales be starting point respectively toward about, about carve minute.

In to the improvement project of above-mentioned bending reinforcing bar inner arc radius measurement to chi, described linear foot is to be positioned at 4 ~ 8 times of scale length above the crossfoot being positioned at scale length below the crossfoot.

Compared with prior art, of the present invention have a following advantage: because it is to utilize the linear foot scale intersection of a pair of Cross ruler to obtain the center of circle of reinforcing bar curved arc, in case the center of circle determined, just can read the curved arc internal diameter easily, so of the present invention simple in structure, measuring method is simple and accurate.

The present invention is further described below in conjunction with the drawings and specific embodiments:

[description of drawings]

Fig. 1 is the front view of the embodiment of the invention;

Fig. 2 is the partial enlarged drawing I of Fig. 1;

Fig. 3 is the partial enlarged drawing II of Fig. 1;

Fig. 4 to be the embodiment of the invention place when measuring synoptic diagram behind the dip stick wherein;

Fig. 5 is the synoptic diagram the embodiment of the invention is placed another dip stick when measuring after.

[embodiment]

The present invention is that a kind of bending reinforcing bar inner arc radius measurement is to chi, it is to utilize the center of circle of circular arc must be on the center line of any 2 lines of circular arc, and two must be made for the principle in the center of circle by the joining of the center line of any 2 lines of circular arc respectively, it includes a pair of Cross ruler of being made by transparent material 1 for this reason, 2, this is to Cross ruler 1, vertical scale of 2 lays respectively at

linear foot

11,21 the right side, the left side, laterally scale all is positioned at

crossfoot

12,22 downsides, this is to

Cross ruler

1,2 indulge, laterally scale the intersection of their scales be starting point respectively toward about, about carve to divide, as Figure 1-3.Measuring, that Cross ruler 1 that earlier vertical scale is positioned at the linear foot right side places on the reinforcing bar 3 to be measured, and its crossfoot 12 both sides are equated with the scale that circular arc intersects, and as shown in Figure 4, promptly laterally scale equates with two segment distance D11, the D12 that circular arc intersects; Another Cross ruler 2 that more vertical scale is positioned at vertical left side places on the reinforcing bar 3 to be measured, the crossfoot both sides are equated with the scale that circular arc intersects, as shown in Figure 5, even its horizontal scale equates with two segment distance D21, D22 that circular arc intersects, the intersection point of vertical scale of such two linear foots is exactly the center of circle O of reinforcing bar curved arc, so just can read reinforcing bar curved arc radius R, at this moment R=D3+D4, wherein D3 be the scale starting point of linear foot to the bee-line of curved arc internal diameter, D4 be longitudinally the scale starting point to the distance of curved arc center of circle O.The present invention utilizes the linear foot scale intersection of a pair of Cross ruler to obtain the center of circle of reinforcing bar curved arc, in case the center of circle has determined that just can read the curved arc internal diameter easily, so of the present invention simple in structure, measuring method is simple and accurately.

The present invention sees through transparent Cross ruler accurately to put the position of chi and read scale.Generally, linear foot is to be positioned at 4 ~ 8 times of scale length above the crossfoot being positioned at scale length below the crossfoot, and in the present embodiment, the linear foot scale length of crossfoot below is 30CM, and the linear foot scale length of crossfoot top is 5CM.

Claims

1. a bending reinforcing bar inner arc radius measurement is to chi, it is characterized in that: include a pair of Cross ruler of making by transparent material (1), (2), this vertical scale to Cross ruler (1), (2) lays respectively at linear foot (11), the right side of (21), left side, laterally scale all is positioned at crossfoot (12), (22) downside, the vertical, horizontal scale of each Cross ruler (1), (2) the intersection of their scales be starting point respectively toward about, about carve minute.

2. bending reinforcing bar inner arc radius measurement according to claim 1 is characterized in that chi: described linear foot is to be positioned at 4 ~ 8 times of scale length above the crossfoot being positioned at scale length below the crossfoot.