KR20030047279A - Cost estimate method for construction project using historical cost data, auto cost estimate system and medium storing a computer program for performing there - Google Patents

Abstract

PURPOSE: A method and system for estimating project expenses for a construction project using results data are provided to estimate an equipment cost and a construction cost at a project planning stage by converting expenses of a previous similar project into the current project expenses based on a results data of a previous construction project and correcting a time and a unit capacity. CONSTITUTION: If a project is selected out of a plurality of previous project results(S301), estimation information of the selected project is copied(S302). If at least one previous project result is selected, a weighted average value of a labor and a price according to each process is calculated from project result data of the selected project, and a project expenses application price database is created(S303). A basic estimation database is created by adding the copied estimation information of the selected project to the project expenses application price database. The created basic estimation database is corrected collectively adapted to requested contents and a characteristic(S304). After completing the correction, if the estimation data are different from new project, the estimation data are deleted, appended, or replaced(S305). A specification of a device is replaced, and an equipment cost is executed(S307). A construction cost is correct with respect to an item related to a construction only, and a construction cost is estimated(S308). An indirect cost is correct out of a construction project expenses(S309).

Description

Cost Estimation Method for Construction Projects Using Performance Data, Automatic Estimation System and Recording Media

The present invention relates to a method for estimating the project cost of a construction project, and more specifically, to the project planning stage before the actual project to enter the project cost and equipment cost estimates accurately and quickly to enable efficient project planning data The project cost estimation method for the construction project using the, and the automatic estimation system and recording medium for performing the same.

In general, in the case of estimating the project cost of a construction project, the type of quotation is determined according to the stage and use of the construction project, and the Association of American Cost Engineering (AACE) estimates the type of quotation according to the estimation method. Are classified into rough estimates, budget estimates, and detailed estimates. Among these, the rough estimate method is carried out at the planning / planning stage, in which the feasibility and scale of the construction project is determined, based on actual data of similar projects in the past. The estimator makes judgments based on his own experience.

More specifically, the coarse estimating method takes into account the detailed information of the acquired information and the characteristics of the project, so that the unit estimate method, the factor estimate method, the parameter estimate method, and the cost The Cost Index Estimatie Method is divided into four methods. The unit cost method calculates costs based on cost data for basic units, for example, the unit area of a building floor, the unit volume of a building, or the unit of use of a building. The cost is calculated based on the cost baseline, where the cost for the base unit is calculated from the cost formula based on the cost data of similar projects in the past. In addition, the element estimate method estimates the rough estimate price using the ratio of the cost of each element constituting the project or construction cost of the project and the cost of the reference element, and when the cost of the reference element is calculated, the cost of other elements is calculated. Is calculated by multiplying the coefficients of each element by the cost of the reference element, and the overall project cost is the sum of the costs for all elements. In addition, the variable estimation method is based on design variables that affect the size or scope of the project, that is, the cost of each system such as the construction, civil engineering, facilities, and electricity of the project is determined by the number of design variables and the unit of quantity of each variable. It is calculated by multiplying the estimated system cost, and the total cost of the project is calculated by adding up the costs of all the systems that make up the project. Finally, the cost index method uses the index to adjust the construction cost at different times and places, and uses the index to calculate the cost of similar projects or facilities that have been carried out in the past to refer to the cost estimate for a new project. Convert to a value for money. This cost index method is mainly used to estimate the cost of construction equipment and plant equipment.

The most widely used technique in the construction project estimate is the unit cost method, but the common method is to convert the past construction cost to the current construction cost by setting a reliable unit in consideration of the characteristics of the project among the past performance data. In order to calculate the rough estimate price more specifically, time and unit capacity are corrected and the cost index method is additionally used.

However, since the estimator uses the estimating techniques independently according to the convenience of personal experience and proficiency, the results vary depending on the skill of the estimator, There is a problem of lack of judgment.

Until now, since estimates of construction projects have been carried out mainly on the amount and quantity, the estimates have been used only for determination of pricing and internal budget after construction projects have been decided. There was an unreasonable point that it could not be used as basic data for management.

In addition, the bidding process takes too long to estimate, since the bidder's decision-making process is carried out separately according to the bidding strategy before the bidding project is completed and projected. There is a tendency that the reliability is lowered, and furthermore, a problem arises that the construction of a construction company and the construction company is inadequate due to the decrease in the reliability of the amount of the investment.

The present invention has been proposed to solve the above-mentioned conventional problems, the object of which is to convert the project cost of the past similar project to the current project cost and correct the time and unit capacity based on the performance data of the past construction project in the project planning stage. It is to provide a project cost estimation method for construction projects using performance data that enables the estimation of equipment costs and construction costs, and an automatic estimation system and recording medium for performing the same.

1 is a block diagram showing a schematic configuration of an automatic estimating system according to the present invention.

2 is a block diagram showing a detailed configuration of an automatic estimating system according to the present invention.

3 is a flowchart showing a project cost estimation process according to the estimation method of the present invention.

4 is a flowchart showing a construction cost application cost database generation process according to the estimation method of the present invention.

5 is a view showing a copy screen of the performance project according to an embodiment of the present invention.

6A is a view showing a capacity correction screen according to an embodiment of the present invention.

6B is a view showing a region correction screen according to an embodiment of the present invention.

6C is a diagram illustrating a time correction screen according to an embodiment of the present invention.

6D is a view showing a labor cost time correction screen according to an embodiment of the present invention.

6E is a view illustrating a productivity correction screen according to an embodiment of the present invention.

7 is a view showing the equipment cost estimation screen according to an embodiment of the present invention.

8 is a view showing a construction cost estimation screen according to an embodiment of the present invention.

9 is a view showing a quotation completion screen according to an embodiment of the present invention.

10 is a view showing the equipment cost simulation screen according to an embodiment of the present invention.

11 is a view showing a construction cost simulation screen according to an embodiment of the present invention.

12 is a view showing an overhead simulation screen according to an embodiment of the present invention.

FIG. 13 is a view illustrating an estimation result after simulation according to an embodiment of the present invention. FIG.

* Description of the symbols for the main parts of the drawings *

10: automatic quotation system

11: computer

12: display device

15: storage device

211: project performance DB

212: Cost unit cost DB

213: Correction Factor DB

214: Quote DB

As a construction means for achieving the above object of the present invention, the project cost estimation method for a construction project according to the present invention

A first step of copying quotation information of the selected performance project when selecting a project similar to a new project to be quoted among a plurality of past project results;

If one or more of the past project results are selected, the weighted average of labor capacity and applied unit price for each sector is calculated from the construction performance data of the selected project, and the actual labor unit price of the project execution area is input to apply the labor cost and various unit cost data. Generating a unit price database;

A third step of generating a basic estimating database by adding the quotation information of the performance project copied in the first step and the unit price information of the construction cost applying unit price database generated in the second step;

A fourth step of collectively correcting the quotation basic data generated in the third step to meet the requirements and characteristics of the new project;

A fifth step of deleting, adding, and replacing the batch revised quote data in units of PBS when there is a difference between the quote data and the new project after the batch correction is completed by the fourth step;

A sixth step of performing an equipment cost estimate by performing a specification and a replacement of the device according to the judgment of the estimator;

A seventh step of estimating the construction cost by correcting the construction cost for the item related only to the construction, not the facility; And

It is characterized by estimating the project cost of the project by the eighth step of correcting the overhead of the construction project cost.

When copying a similar project in the first step, labor capacity and unit price information of each item are not copied from the construction cost.

In addition, the information delivered to the new estimate project among the information in the construction cost application unit price database generated in the second step is characterized in that the labor capacity, material unit cost, cost unit price, mid-term unit price of each item.

In addition, the correction step (fourth step) is the capacity correction for the correction according to the capacity of the new project, the time correction to correct the price difference according to the construction time of the performance project and the new project, the regional difference between the performance project and the new project It consists of regional corrections to correct various unit cost differences, and productivity corrections to correct differences in construction labor productivity existing by region and country.

In addition, the method of estimating according to the present invention may further include a ninth step of performing the first to eighth steps to adjust the estimated amount of equipment costs, construction costs, and overhead costs after the quotation for the new project is completed. The adjustment is made by changing the correction factor.

In the estimating method according to the present invention, the generation of the cost database unit cost database is

Selecting one or more of a plurality of past performance projects;

Combining the selected performance projects by sub-items to form various unit price databases and labor capacity databases;

Inputting the actual labor price in the region of the new project to form a labor price database;

Calculating a weighted average amount of labor for each item by averaging a plurality of labor volumes from the labor capacity database;

Calculating a weighted average labor price per work type using the data of the labor price database;

Calculating the average labor price per item by multiplying the calculated average labor amount by the average labor price; And

It is characterized in that it comprises the step of generating a cost-cost unit cost database by applying the various unit cost database and the average labor price per item.

The invention also includes a recording medium on which a program for executing each of the above-described steps is recorded.

In addition, the present invention provides a computer-based automatic estimation system including a memory for storing data and software, a CPU for executing software, and a RAM and ROM for booting and working.

A first database for accumulating and storing actual estimate data of a plurality of projects performed in the past;

A second database for storing labor costs and various unit prices to be applied to the project to be estimated;

A third database for storing a plurality of correction indices for correcting the historical data of past projects according to a project currently estimated;

A fourth database for storing and storing estimate data of the project currently being estimated;

After copying the performance data of one project from the first database and storing it in the fourth database, various unit prices are calculated by combining one or more performance data stored in the first database, and stored in the second database. An estimate processing unit applying the unit price of the second database to the performance data copied to the fourth database and calculating the correction by applying a plurality of correction indices of the third database to estimate the project cost for the new project;

A simulation unit for adjusting an estimate amount of the new project calculated by the quotation processing unit by an index correction method; And

Characterized in that it comprises an output unit for outputting the estimate result of the estimated new project.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail with reference to attached drawing.

1 is a schematic configuration diagram showing an example of an automatic estimation system 11 according to an embodiment of the present invention. The automatic estimation system 11 according to the present invention is a construction cost application cost required for historical data and estimate processing of past projects. A process of receiving the data from the storage unit 15 storing the correction coefficient and the result data which is currently quoted, performing the estimation process based on the selected past performance data, and then visually displaying the result on the display screen 12. It consists of the computer 11 which stores in the said memory | storage part 15, carrying out the following. In the figure, 14 denotes a keyboard for data input and 13 denotes a mouse which is a pointing device.

The storage unit 15 may use a hard disk built into the computer 11, but here, a video information library, a floppy disk, a CD-ROM, a DVD, or the like connected to the computer 11 via a network is used. It is also possible to use a recording medium. In addition, the storage unit 15 may store the past performance data, the cost of construction cost, the correction coefficient and the estimation result data separately on different recording media, or may be stored together on one recording medium.

FIG. 2 is a block diagram of the computer 11 shown in FIG. The computer 11 includes a CPU 201 that executes processing based on software described in detail below, a ROM 202 storing a booting program, and the like, and a RAM used as a work area of the CPU 201 ( 203, a keyboard 204 and a mouse 205 for performing various input operations, and a display device 12 such as a CRT or a liquid crystal display, which includes a display screen 12 for displaying an intermediate process or processing results of the quotation processing. 206, a hard disk 208 that stores various application programs or data including estimation software 207 for realizing automatic estimation processing according to the present invention, a storage unit 15 and a computer shown in FIG. Interface portions 209 such as various drivers and network adapters for connecting 11 and at least buses 210 for connecting the respective portions are provided.

The storage unit 15 for storing the quotation processing related data includes a project performance DB 211, a construction cost application unit price 212, a correction coefficient DB 213, and a quotation DB 214.

The project performance DB 211 is a database built by accumulating actual performance data of a construction project that has been completed in the past or is currently in progress.

The construction cost application unit DB 212 is a database configured for the purpose of calculating the labor volume and various unit prices to be applied to the project to be estimated in the automatic estimation system, and the estimator is based on the calculation of labor volume and various unit prices to be applied to the new project. When at least one project to be selected is selected from the project performance DB 211, a weighted average value of labor volume and various unit price performance data of the selected past projects will be described later.

The correction coefficient DB 213 is a database that accumulates indices used to correct the project performance data for estimating a new project, and includes four types of capacity, time, region, and productivity. The indices related to the calibration are stored.

Finally, the quotation DB 214 is based on the data of the project estimate DB 211, construction cost application unit cost DB 212, correction coefficient DB 213 by the automatic estimation system 11 estimate software 207 By storing the project data created by the project, the work is performed by the process of quotation, and the details are written.

The configuration of the automatic estimation system 11 shown in Figs. 1 and 2 described above is merely an example, and any system configuration can be used as long as the functions of the embodiments described later can be realized.

The project cost estimation process according to the present invention performed by the estimation software 207 establishes a construction cost application cost database that sets a reliable unit in consideration of project characteristics among past performance data, and displays the current project cost. The cost estimate method is used to calculate the time and unit capacity, and then the estimated price estimate is more detailed. The estimator can apply various estimation techniques in consideration of the project characteristics and size. In addition, labor cost data based on labor volume as well as amount and quantity can be calculated so that the results of the estimation work can be utilized in the management system to enable efficient project management. By providing a decision making process, the determination of the amount of the investment can be made in the estimating system, thereby increasing the reliability of the estimating operation and providing the estimator's judgment systematically.

The project cost estimation method for a construction project using the performance data of the present invention will be described by dividing into a quotation work process, a decision making process, and a construction cost application unit cost DB generation process.

Quotation process

3 is a flowchart showing the process of estimating work in the project cost estimating method of the present invention.

As a first step of estimating a new project using the estimating system according to the present invention, a project similar to the currently planned project is selected from the results of the previous project, and the estimate data of the past project is copied (S301, S302). .

In the configuration of FIG. 2, the estimating software 207 stored in the hard disk 209 performs a function of copying a similar project selected from a plurality of projects stored in the project record DB 211 of the storage unit 15. .

5 shows an example of the screen display state of the similar project copying step. When the project copying function (not shown) of the menu is executed in the estimation system execution window 60, the performance project copying window 61 is opened. The past project 62 selected in the upper part of the historical project copy window 61 is displayed, and actual quotation data for the selected project is displayed in the lower part 63 of the previous project. 2 is stored in the quotation DB 214 as basic quotation data of the newly planned project. That is, the performance data of the project copied to the quotation DB 214 constitutes a basic framework for the estimation work of the new project.

The project to be copied from the project performance DB 211 is a project range that is more similar to the project to be estimated from the list of performances of the same equipment type, such as construction work of the newly planned project, eg new construction of a blast furnace, modification of the instrument of a performance factory, etc. It is selected to have.

And, when copying the performance information of the selected project to the quotation DB (214), in the case of construction costs, all the information except the labor capacity and unit price information of each item (COA) is copied, in the case of equipment costs all information is copied do.

Next, a construction cost application unit DB 212 is generated (S303). That is, various copies of labor volume information, materials, equipment, etc., which have been excluded at the time of copying the similar performance project generating the basic framework of the new estimation work, are obtained through the creation of the construction cost application unit price DB 212. The construction cost application unit price DB 212 is generated by calculating the weighted average value of the labor capacity and applied unit price for each commodity from the construction performance data of the past project selected by the estimator. The creation of the construction cost application unit price DB 212 will be described in more detail below.

The construction cost application unit price DB 212 generated as described above is used to estimate the new project, at this time, the information used in the estimate of the new project in the application unit price DB 212 is estimated by code of account (code of account: quote account number system) Labor cost, material unit cost, expense unit price, and mid-term unit price. The labor unit price is excluded when the application unit price DB 212 is generated, and the information provided in this way is used for estimating the construction cost of the new project estimate, and is not related to the equipment cost estimation work. Quotation account number system used in the present invention is classified into a physical breakdown structure (PBS: Physical Breakdown Structure) to classify the facilities of the facility and the work classification system in consideration of the vertical relationship between the construction work (CBS: Commodity breakdown structure) is used in combination, and the number of detail is changed according to the kind of quotation and the number of estimate account number is increased as the business progresses. In the above, the facility classification system can be selected and used according to the business scope of the project to set a certain standard.

As described above, when the construction cost application unit price DB 212 is generated, with the information transmitted from the similar performance project and construction cost application unit price DB 212 once the creation of all items related to the quotation is completed, the estimate DB (214) The collective correction is made according to the requirements or characteristics of the project (new plant capacity or when the project is scheduled to be performed or regional characteristics) for newly estimating the project data contained in the past (S304). This correction process is applied to both construction and equipment costs, and the types of corrections can be divided into capacity, time, region, and productivity. This correction is to reduce the error of the rough estimate result by applying the appropriate correction factor. In other words, the state of the estimate data before correction is only a part of the performance information of the past project is selected or combined and transferred to the estimate DB, and the conditions of the new project to be actually quoted are not reflected. Therefore, this correction step is to apply the correction to the combined performance data to reflect the characteristics and conditions of the newly planned new project.

Looking at the state of the quotation information stored in the estimate DB (214) immediately before the correction, the quantity of each COA is a quantity of a copy of the similar performance project as it is, and the unit price of each item is one or more past constituting the construction cost application DB (212) The weighted average value was calculated by converting the construction performance data into the current price at the time of estimation, and the construction cost application DB 212 is composed only of the performance information of the constructions performed in Korea.

As described above, the corrections made at this time are 1) capacity correction, 2) time correction, 3) regional correction, and 4) productivity correction, and the application and scope of adjustment for each project item is shown in Table 1 below.

Capacity correction Time compensation Regional correction Productivity correction Construction cost material cost Apply to quantity Apply to unit price Apply to unit price Do not apply labor cost Apply to quantity Apply to unit price Not applicable Applied to labor capacity Material cost Apply to quantity Apply to unit price Apply to unit price Not applicable security Apply to quantity Apply to unit price Apply to unit price Not applicable Equipment cost Equipment cost Applied to unit price and converted installation weight Apply to unit price Apply to unit price Not applicable

The correction may be different in domestic and overseas construction. Estimates for domestic construction only need to be corrected for time and capacity, excluding productivity and regional corrections.However, overseas construction estimates are based on the past performance, which is the basis for domestic construction. All must be done.

The correction coefficient DB 213 constructed for correction requires continuous updating of correction data. For example, in the case of the price index used for time correction, the producer price index for each country needs to be updated with the annually released values, and the correction factor for regional correction also requires the addition of a new country. The update of the correction coefficient DB (213) is an important matter that can increase the accuracy of the estimation work result through the correction.

The correction step S304 will be described in detail by dividing it into 1) capacity correction, 2) time correction, 3) regional correction, and 4) productivity correction.

1) Capacity correction

Capacity correction is used to estimate the purchase and construction costs according to the specifications of the newly introduced equipment or the size of the plant. In other words, it is used when the same kind of equipment or industrial facility performs a rough estimate of the cost when it differs only in size (or capacity). Based on a generally known power-factor model, the cost-capacity index is calculated and the cost-capacity index is used to calculate the corrected cost. When applying the relationship between cost and capacity, the size or range of capacity to which the relationship between cost and capacity can be applied should be defined in advance, and within that range. Typically, 0.6 or 0.7 is used as the cost-capacity index if there is not enough data available to analyze the relationship between cost and capacity. In the present invention, for the case where the accumulated performance data is not sufficient, the cost-capacity index of 0.6 is collectively applied as the initial value of the cost-capacity index. However, this is not a fixed value and can be changed from the judgment by the estimator's experience.

Since the theoretical background of the capacity correction is generally known in the estimation field, a detailed description thereof will be omitted.

FIG. 6A shows a screen display state of capacity correction, which reflects the difference between the capacity of the selected past performance project and the capacity of the project to be estimated now. The capacity correction is performed by introducing a cost-capacity index of 0.6. As shown on the screen, the correction window has a selection button for selecting whether to apply, the estimator can select whether to apply.

2) Regional correction

Regional correction compensates for differences in project costs incurred due to differences in relative productivity, wages, materials, equipment, transportation, taxes, and construction management costs between two geographically displaced regions. Use local correction factors. The area correction factor converts the cost of performing the project in the area A into the cost of performing the area B under the assumption that all the conditions except the area in which the construction is carried out carry out the same project. This area correction factor is generally well known in the construction field. In this system, once the historical performance data is composed only of domestic construction data, there is no large regional difference between domestic regions, so it is applied only when estimating overseas projects. It was. However, this is an example and may change when the performance data changes.

However, it is not easy to find the difference in the cost of performing construction projects between countries, and in this example, it is published in a 1997 study published by McConville, J. G ("Cost comparison of pacific rim countries", AACE International Transactions, 1997). The regional correction factors of 12 countries including Korea were applied. However, this is not fixed and changes to values that can further reduce errors as new research is done.

Regional corrections of total project costs, including material and equipment costs, are largely divided into batch corrections and detailed corrections. In the case of purchase of equipment to be used for overseas construction, there may be various cases, such as supply of the region, domestic post-production transport, and third region post-production transport, depending on the region of the original producer of the device. This makes detailed corrections. Transportation costs, import duties, brokerage fees, exchange rates, etc. are considered. Details necessary for local correction shall be directly reflected by the estimator. In this system, the regional correction coefficients for these local corrections can also be added to new countries or modification of the existing correction coefficient values.

FIG. 6B shows a display example of the region correction screen described above. In the present embodiment, the correction factor for each country is applied to apply only for overseas construction, and when the estimator selects the construction country of the new project, the applicable index of the corresponding country Appears at the bottom, and then, by selecting the apply button, the region correction by the selected correction coefficient is executed.

3) Time correction

The time correction of construction project estimates is usually a cost index or a price index. The cost index is a representation of the change and difference in prices over time. It is used to convert to the cost of. At this time, it is assumed that the quality and quantity of the items are the same in both time zones and the same, and the cost index indicates the change in complex costs over time.

The cost index is published regularly by various organizations, such as overseas news such as Engineering News-Record (ENR), Construction Cost Index (CCI), the construction cost index of the Korea Construction Association, and the construction of the Korea Institute of Construction Industry. From the domestic data such as price index, select and use the data to reduce the error on the estimation result.

In this system, the producer price index is applied during time correction, and if a more detailed price index exists, it can be selected and applied. FIG. 6C illustrates a screen for collectively performing time correction using the producer price index for each year, and FIG. 6D illustrates a screen for performing time correction for labor costs based on the results of a survey on wages in the construction industry announced by the Korea Construction Association. will be.

In the above, when time correction work using the producer price index or construction cost index, the index data should be updated by a certain time (for example, 4, 5 years) in order to reduce the error range.

In the present invention, various index values are input to the correction coefficient DB 213, so that correction coefficient values can be added and updated later.

In addition, time-series analysis is employed to predict the trend of future changes by analyzing the trend of changes in construction cost index values over the past several years.

3) Productivity correction

Differences in construction labor productivity in each country and region are one of the important factors affecting the project and should be considered in the estimates. In the productivity correction of the present invention, it is basically applied to labor costs, specifically, labor capacity, but this can be changed and modified. Of course, the above-mentioned time and regional correction coefficients partially reflect regional and hourly changes or differences in labor productivity, but at the discretion of the estimator, the selection function is provided so that additional correction of regional labor productivity can be applied. The production correction factor is based on data from Kenneth K. Humphreys published in 1997 ("Sources of International Cost Data", Keynot Address Presented at the NORDNET '97 Confererence, "Quality in Project Management", Reykjavik, Iceland, 11 September 1997). I use it. This will change if new research data are published.

6E illustrates a screen display example of the above-described productivity correction step, in which a productivity correction window including a selectable country-specific productivity correction index list, a selected application index display unit, and a button for selecting whether to apply is displayed.

Fig. 6F is a screen showing the result of the correction after executing the collective correction of the above-mentioned capacity, time, region, and productivity, and shows the estimated amount after the correction, when the estimator thinks that the estimated amount is not appropriate after the review, that is, When the calibration is made incorrectly, it provides the option to go back to the state before the batch calibration. Compared with the state before the correction shown in Figure 5, it can be seen that the total volume is changed according to the project to be estimated, and the total project cost is also changed.

As described above, when the batch correction is completed, the replacement, addition and deletion operations are executed in accordance with each equipment division system (PBS) of the estimate data to the next step (S305).

After the batch calibration is completed, if there is a difference in the status of the quotation database and the scope of the new project, this step is used to change the scope of the new project by replacing, adding, and deleting the corresponding PBS from the current quotation database. Convert That is, the PBS constituting the estimating database may be modified to be approximated with the new project at the estimate of the estimator, or may be replaced with the PBS of another performance project. When the PBS imported from the performance database is added to the PBS of the new estimating project, all correction indices previously applied to the batch correction are equally applied (S306). The PBS replacement is to replace the PBS existing in the project to be quoted with the PBS selected from past project results. At this time, the PBS of the selected quotation project is deleted and replaced with a new PBS.

As described above, when all the rough corrections to the results of the past project have been completed, the process of estimating the actual equipment cost, the construction cost, and the overhead cost constituting the total project cost is now started (S307, S308, S309).

First, equipment cost estimates provide estimates for individual devices. In other words, this system provides the function to classify or analyze the data that can refer to the information of equipment existing in the facility cost performance data of the performance project by various criteria. That is, the equipment cost estimation is performed based on the data of the quotation DB 214 containing the operation state from the initial stage (S301) to the previous equipment non-estimate stage (S307), wherein the estimation is carried out in two ways: detailed estimate and rough estimate. Can be executed. Detailed estimates of equipment costs are made in units of Equipment Number, and the specifications of the equipment can be changed and modified as required by the estimator. In addition, the estimator provides the function to analyze the equipment cost information of the performance project in consideration of the capacity and time correction and refer to the result to perform detailed estimation of the equipment cost. In addition, it is possible to perform detailed corrections to the changed items when necessary. In addition, when a COA change is required based on the detailed quotation for each device, the COA can be modified.

7 shows the equipment cost estimation screen provided by the system, shows a plurality of function buttons for equipment cost estimation on the equipment cost estimation window, a list of equipment costs stored in the quotation DB 214 on the left side of the screen, and the upper right side of the screen. In the past, historical performance information is displayed, and at the bottom right of the screen, the facility information display and correction function of the project currently estimated are provided at the same time. Through the equipment cost estimate screen of FIG. 7, the estimator may reflect and correct the equipment cost by device.

Next, the construction cost estimate is for items related only to the construction regardless of the equipment, and mainly refers to the detailed estimation of bulk materials. In this system, the construction cost estimation can be made in detail by modifying and adding the construction cost individual items, and also reflects the characteristics of the project currently estimated through various kinds of corrections in the performance data copied from the project performance DB 211. Have them convert to quote information. When revising individual estimate data, the construction cost estimate by changing the correction factor is possible for all four types of corrections, such as capacity, time, area, and productivity.In the case of capacity correction, all items with the same capacity correction index value are used. The calibration work is done in a batch.

8 shows an embodiment of the above-described construction cost estimation screen, showing a construction list on the left, information, quantity and construction costs for the selected construction on the right.

Overhead costs represent financial costs that are not related to equipment costs and construction costs.The overhead costs of new projects are already included in the quotation DB (214) through the copying of similar projects, replacement and addition of PBS, and various corrections. You lose. Therefore, in the indirect non-estimate step S309, the indirect cost of the quotation DB 214 is reviewed and adjusted.

Finally, the completed estimate result is reviewed and some items are adjusted (S310). 9 is a screen for reviewing the estimation result shown in this system, in which the bibliographic information and the estimated total volume and total project cost for the new project estimated are shown, the project details appear on the left side of the screen, and the detailed quotation for the selected portion on the right side of the screen. Shows the result. The estimator may perform a final review by viewing the screen as shown in FIG. 9 and may adjust the amount of some items.

Decision Making Process

Next, a decision process for final adjustment of the total estimated amount will be described.

Simulation of the estimated amount is an operation of adjusting the total estimated amount after the above-mentioned estimation of the facility cost, construction cost, and overhead cost is completed, and the system implements a change of the correction factor.

Therefore, the estimator can adjust the change in the total quotation amount while variously applying and applying the types and values of the correction coefficients applied to the equipment cost and the construction cost item. In addition, the overhead adjustment is performed by changing the previously applied ratio.

10 is a simulation result simulation screen for the equipment cost, the equipment cost simulation screen, the information on the estimation project is displayed on the upper part, the amount of each model is shown on the left side of the lower part, and the detailed device-specific specifications for the selected model is shown on the right side. . The bottom line shows the correction index type, the original correction index value, and the newly adjusted correction index value for the simulation. The estimator can adjust the equipment cost estimate by applying the new correction index value and then applying it.

FIG. 11 shows a simulation result simulation screen for the construction cost. Similarly, the construction project information is displayed at the upper part, the amount of each type is shown at the lower left side, and detailed information of the PBS unit is selected at the right side. In addition, it is possible to adjust the construction cost by adjusting the correction index by displaying and entering the correction index type, the previous correction index value, and the newly applied correction index value in the lower line.

12 is a screen for simulating the result of the estimation of the overhead costs, as shown, the amount of each overhead costs are displayed, there is a display for the current application rate and the correction application rate, by adjusting the application rate, by simulating the overhead costs You can try.

FIG. 13 shows the estimation result after the simulation operation, and it can be seen that the estimate data after the collective correction shown in FIG. 6F has been adjusted somewhat.

When the adjustment and review of the above quotation results are completed, the quotation results of the completed project can be output.

Construction Cost Application Unit DB Creation Process

The construction cost application cost DB generation and application process described in the estimation work process will be described in detail with reference to the flowchart of FIG. 4.

At least one of a plurality of past project records stored in the project record DB 211 is selected (S401).

Then, it is combined by the detailed items of the selected performance project (S402), various unit price databases and labor capacity database are formed, and labor unit prices are inputted to generate labor unit price databases (S403 to S405).

The weighted average labor amount for each item is calculated based on the data of the labor capacity database (S406), and the weighted average labor price per work is calculated based on the data of the labor price database (S407). Then, the average labor price for each item is calculated by multiplying the calculated labor amount by the unit price (S408, S409).

The various unit price data generated above and the average labor price per item are generated together to generate a unit cost data unit price (S410).

As described above, the present invention provides a database that can systematically build the performance data of the construction project, improve the reliability in the rough estimate work, and systemize various estimating techniques to estimate the time required for estimating work It is effective to shorten the time and to centrally manage the data of the estimation work.

In addition, the present invention provides a decision making process that simulates the results of quotations, thereby reducing the decision time and making the bidding price at once, thereby maintaining the consistency of the estimation work and improving the accuracy of the bidders. have.

In addition, since the estimation result of the construction project can be used as basic data for project management, it is possible to effectively manage the construction project.

Claims (9)

A first step of copying quotation information of the selected performance project when selecting a project similar to a new project to be quoted among a plurality of past project results; Selecting at least one of a plurality of past project results, calculating a weighted average of labor capacity and applied unit cost for each sector from the construction project data of the selected project to generate labor cost and various unit cost data; A third step of generating a basic estimating database by adding the quotation information of the performance project copied in the first step and the unit price information of the construction cost applying unit price database generated in the second step; A fourth step of collectively correcting the quotation basic data generated in the third step to meet the requirements and characteristics of the new project; A fifth step of deleting, adding, and replacing the batch-corrected estimate data by a PBS unit if there is a difference between the estimate data and the new project after the batch correction is completed by the fourth step; A sixth step of performing an equipment cost estimate by performing a specification and a replacement of the device according to the judgment of the estimator; A seventh step of estimating the construction cost by correcting the construction cost for the item related only to the construction, not the facility; And A method of estimating a project cost for a construction project using performance data, comprising estimating the project cost of the project by an eighth step of correcting overhead costs among the construction project costs. The method of claim 1, When the copy of the similar project in the first step, the labor cost and unit price information of each item is not copied from the construction cost project cost estimation method for the construction project using the performance data. The method of claim 1, The information delivered to the new estimate project among the information in the construction cost application cost database created in the second stage is labor cost, material cost, expense cost, and medium price for each item. Way. The method of claim 1, The correction step (step 4) is a capacity correction for correcting the capacity of a new project, a time correction for correcting a price difference according to the construction time of the performance project and a new project, and a construction area difference between the performance project and the new project. Method for estimating project cost for construction project using performance data, characterized in that it consists of a regional correction to correct the difference according to, and a productivity correction to correct the difference of construction labor productivity existing by region and country. The method of claim 1 wherein the method is After performing the first to eighth step to complete the quotation for the new project, and further comprising a ninth step of adjusting the estimated amount of equipment costs, construction costs, and overhead costs for the construction project using the performance data How do you estimate business expenses? The method of claim 5, wherein the adjustment of the ninth step is performed by changing a correction factor. The method of claim 1, wherein in the third step, creation of a cost-cost unit cost database is Selecting one or more of a plurality of past performance projects; Combining the selected performance projects by sub-items to form a unit price database excluding labor unit price and a labor volume database; Inputting a labor unit price in a corresponding region to form a labor unit price database; Calculating a weighted average amount of labor for each item by averaging a plurality of labor volumes from the labor capacity database; Calculating a weighted average labor price per work by averaging the data of the labor price database; Calculating the average labor price per item by multiplying the calculated average labor amount by the average labor price; And The project cost estimation method for a construction project using the performance data comprising the step of generating a cost database unit cost by applying the labor price input in the step and the calculated average labor price per item. A recording medium on which a program for executing the method according to any one of claims 1 to 7 is recorded. In a computer-based automatic estimation system including a memory for storing data and software, a CPU for executing software, and a RAM and ROM for booting and working, A first database for accumulating and storing actual estimate data of a plurality of projects performed in the past; A second database for storing labor costs and various unit prices to be applied to the project to be estimated; A third database for storing a plurality of correction indices for correcting the historical data of past projects according to a project currently estimated; A fourth database for storing and storing estimate data of the project currently being estimated; After copying the performance data of one project from the first database and storing it in the fourth database, various unit prices are calculated by combining one or more performance data stored in the first database, and stored in the second database. An estimate processing unit applying a unit price of the second database to the performance data copied to the fourth database and calculating a correction by applying a plurality of correction indices of the third database to estimate the project cost for the new project; A simulation unit for adjusting an estimate amount of the new project calculated by the quotation processing unit by an index correction method; And Automatic estimating system for construction projects using the performance data, characterized in that it comprises an output unit for outputting the estimate result of the completed new project.