CN2145407Y

CN2145407Y - Quick-count rute for economic value target of construction poject

Info

Publication number: CN2145407Y
Application number: CN 92216892
Authority: CN
Inventors: 魏世奇
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-09-02
Filing date: 1992-09-02
Publication date: 1993-11-03
Anticipated expiration: 2002-09-02

Abstract

The utility model relates to a computing tool. The utility model is characterized in that in the front-side graph rule of a rapid computing rule, a left longitudinal scale, a right longitudinal scale, and a horizontal scale are respectively marked with internal rate of return (IRR), multiple B of net present value, and rate of return on investment (R/I); a slide rule is marked with integrated rate ratio (1+i) for a loan, etc.; a fixed rule is marked with total investment (I), the payback period of a loan, etc. When the utility model is used, according to the economic evaluation indexes of a construction project, which are to be solved, a vertical and a horizontal verniers are slid so that alignment scales are aligned with the value which is to be solved. The utility model has the advantages of simple structure, convenient use, convenient operation, accurate computation, etc.

Description

Quick-count rute for economic value target of construction poject

The utility model relates to a kind of computational tool.

When calculating the construction project economic target, adopt manual (comprise and use counter) tabulation to calculate mostly at present, the perhaps making software calculating that uses a computer.Preceding a kind of method effort is time-consuming, and efficient is low, and then a kind of method apparatus cost height carries inconvenience, and needs professional operating personnel.

The purpose of this utility model provides a kind of with low cost, convenient, flexible, can make the economic evaluation personnel in all case, quick and precisely calculates the construction project economic target, at any time the dedicated computing instrument of serving for investment decision person.

The utility model is by the curve map chi, scale, the slide rule and the vernier that slides are in length and breadth formed, the curve map chi is arranged on the front upper of speed-calculating ruler, the vertical scale top five equilibrium mint-mark in the 0-40 percentage range in the left side of curve map chi has construction project internal rate of return (IRR) value, the vertical scale bottom mint-mark in the left side of curve map chi has the project duration (K), the right vertical scale mint-mark of curve map chi has net present value (NPV) multiple (B), the five equilibrium mint-mark in the 0-40 percentage range of the horizontal staff of curve map chi has project static investment earning rate (R/I) value, the middle part mint-mark of curve map chi has construction project construction period pencil of curves, the scale that is positioned at below, speed-calculating ruler front has loan consolidated interest rate (i) in the mint-mark of 1-30 percentage range, gross investment (I), 1-30 collection period (N), investment payback time (P), transition parameter (W), be positioned at mint-mark loan worthy (R) on the slide rule of speed-calculating ruler bottom, gross investment (I), span is that the loan consolidated interest rate of 1.01-1.30 is than (1+i), the vernier that slides is in length and breadth made by organic glass, mint-mark aligns scale on it, and speed-calculating ruler can be by cardboard, plank, rigid plastic is made.

The utility model and existing computational tool ratio have cheaply, are convenient to make, and can finish more complicated, specific calculating process, and be easy to use, processing ease, and not limited by environment for use.

Accompanying drawing 1 is the utility model structural plan synoptic diagram.

Accompanying drawing 2 is the utility model A-A sectional view.

Below in conjunction with accompanying drawing the utility model is further described:

The utility model by curve map chi, scale, slide rule and in length and breadth vernier four parts form (in Fig. 1,2, providing), vertical scale 2 expression construction project internal rate of return (IRR) desired values in the left side of curve map chi 1, it is evenly divided in the 0%-40% scope, and this is that the utility model requires to obtain main evaluation index.The value of curve map chi horizontal staff 4 expression project static investment earning rates (R/I), it also is to make in the scope evenly divided of 0%-40%, the above-mentioned parameter span can satisfy most project actual needs.Five suite wire harness in the curve map chi show the five kind situations of construction project construction period K from 1-5.The intrafascicular curve of every sets of curves is represented the construction project of different Discount Period n, and the general value of n is 16-24.Discount Period n equals phase project economic life and adds duration K.Curve is according to formula among the figure, by the computer program described point, and is revised and is depicted as.

In the vertical scale negative direction in a curve map chi left side, equal 12% by social discount rate and calculate intercept (r ^-k-r ^-n)/(1-r ^-1), and get corresponding scale by the different duration K of 1-5.The ratio B of vertical scale 3 expression project net present value (NPV) NPV in the right side of curve map chi and project gross investment I, i.e. NPV/I=B.After obtaining the B value, and known gross investment I, just can try to achieve net present value (NPV) NPV very soon.

Scale 5i% represents the consolidated interest rate of providing a loan, span 1%-30%.The I scale is represented gross investment, and its scale span can be grasped flexibly, also can 10-1000(ten thousand yuan), also can be ten thousand yuan of 1000-10000() the scope value.With the slide rule R and the I of this scale scale pairing, expression project repaying ability and gross investment, promptly this scale can show R and two parameter values of I simultaneously.The scale of this group scale, slide rule is the logarithm value.

Scale W value is a transition parameter, the logarithm value and its corresponding broken line scale is attached most importance to.Scale scale N is the loan repayment time limit, and span 1-30, slide rule refer to the result of calculation of the corresponding collection period of line N.Slide rule scale 1+i is a lending ratio, (that is, adding the loan consolidated interest rate), span 1.01-1.30.

Scale P is the investment payback time, and it is directly looked into and get for the inverse of static investment earning rate R/I, available vernier.

Vernier 7 usefulness transparent organic glass are made in length and breadth, can slide along the speed-calculating ruler edge, and effect is to align scale, improves accuracy in computation.Other parts of slipstick can be used template made such as cardboard, plank, rigid plastic.Because of each parameter all is related, need curve map chi, scale, the supporting use of slide rule, so the utility model be possess the figure chi in conjunction with, plane square design feature, the special-purpose speed-calculating ruler of economic evaluation.

Using method of the present utility model is:

(1) aligned a certain scale of scale I by a certain scale of slide rule R, R/I refers to that the scale numerical value that line aligns slide rule is rate of return on investment.

(2) on curve map chi horizontal staff, look for the R/I point, add the construction period according to known items completion time of project K and Discount Period n(phase economic life), longitudinally vernier refers to that line looks for the corresponding point on the curve, refer to that along horizontal vernier line looks into vertical scale left again, its corresponding scale is the internal rate of return irr numerical value of asking.

(3), look for the vertical scale negative direction corresponding point in a curve map chi left side by known items duration K; Get the scale of social discount rate 12% again along positive dirction, refer to that along horizontal, vertical vernier line finds corresponding point at the transverse axis scale, connect at above-mentioned 2 and extend to right vertical scale.At this moment from the R/I point of known items, upwards the on line intersection point is handed over vertical scale more to the right therewith, promptly tries to achieve net present value (NPV).The multiple B of specific investment I then with slide rule and scale work multiplication mutually, can try to achieve totally net present value (NPV) NPV.

(4) moving cursor refers to line, and from the corresponding point that the rate of return on investment R/I of known items looks for scale P downwards, this scale is investment payback time P.

(5) to calculate process quickly be with ability of paying back R scale value on the slide rule to collection period, align scale i loan interest rate scale, on slide rule I, look for the corresponding scale W of loan ceiling transition parameter again, then align the W value with slide rule 1+i scale, at this moment the n on the slide rule refers to that line aligns the scale value of scale n, is the collection period of asking.

Claims

1, economic assessment of construction projects index speed-calculating ruler, be by the curve map chi, scale, the slide rule and the vernier that slides are in length and breadth formed, it is characterized in that curve map chi 1 is arranged on the front upper of speed-calculating ruler, the vertical scale 2 tops five equilibrium mint-mark in the 0-40 percentage range in the left side of curve map chi has construction project internal rate of return (IRR) value, the vertical scale bottom mint-mark in the left side of curve map chi has the project duration (K), right vertical scale 3 mint-marks of curve map chi have net present value (NPV) multiple (B), the five equilibrium mint-mark in the 0-40 percentage range of the horizontal staff 4 of curve map chi has project static investment earning rate (R/I) value, the middle part mint-mark of curve map chi has construction project construction period pencil of curves, the scale 5 that is positioned at below, speed-calculating ruler front has loan consolidated interest rate (i) in the mint-mark of 1-30 percentage range, gross investment (I), 1-30 collection period (N), investment payback time (P), transition parameter (W), be positioned at mint-mark loan worthy (R) on the slide rule 6 of speed-calculating ruler bottom, gross investment (I), span is that the loan consolidated interest rate of 1.01-1.30 is than (1+i), the vernier 7 of sliding is in length and breadth made by organic glass, mint-mark aligns scale on it, and speed-calculating ruler can be by cardboard, plank, rigid plastic is made.