JP4360541B2 - Building equipment cost estimation program - Google Patents

Description

  The present invention relates to a construction equipment cost estimation program, and more particularly to a program for estimating a composite cost including equipment costs, labor costs and related costs related to equipment construction of a new building.

  In building construction work, an estimate of total construction costs or partial construction costs is required at each stage of planning, design, contracting, and construction, depending on the purpose. The estimation methods are roughly classified into approximate estimation and detailed estimation (see Non-Patent Document 1). The rough estimate is required, for example, in order to formulate a design concept such as the size, structure, and usage of a building in the planning stage, or to adjust the budget and design contents in the basic design stage. The detailed estimate is calculated by finely classifying materials and equipment costs, labor costs, various expenses, etc. necessary for the construction based on the design documents (design drawings, specifications, etc.) and totaling the quantities and unit prices thereof. In the contract stage, a detailed estimate (original product) is generally prepared. However, there are cases where the contractor contracts between the builder (owner) and the contractor based on the approximate estimate. For this reason, rough estimates are not sufficient and tend to require accuracy.

  According to the detailed estimate based on the design book, the total construction cost or the construction cost by each part can be calculated in detail by the “stacking method” that sums up the quantity and unit price of each construction cost classified in detail. On the other hand, rough estimates for buildings to be newly constructed (hereinafter sometimes referred to as new projects) often have to be made at a stage where design books are not available. For this reason, in the past, many rough estimates looked for new projects that were similar in terms of usage, scale, structure, etc. from buildings that had a history of construction work in the past (hereinafter sometimes referred to as actual projects). Calculate the construction cost from the unit price per unit or unit price (in the case of collective housing) of the actual project found and the number of units per unit or the number of units, taking into account differences in construction content, design conditions, fluctuations in prices and labor costs, etc. The method is adopted. There is also a method of calculating the construction cost of a new project by obtaining the unit price per unit facility (for example, 1 bed) from the actual project, based on the scale of the facility of the building, for example, the number of beds in a hospital building (Non-Patent Document) 1).

  In recent years, the demand for building functions has increased, and the proportion of equipment construction costs to the total construction costs has increased accordingly. In order to make an accurate estimate, construction equipment materials and equipment costs, labor costs, and other related costs (below) These are collectively referred to as compound costs), and it is necessary to accurately estimate them. However, the above-mentioned conventional rough estimation methods, for example, have a proven track record because the unit cost per unit and unit price of equipment construction costs vary greatly depending on the equipment specifications, grade, construction area, etc. There is a problem that it is difficult to accurately estimate the equipment construction cost of a new project from the project. According to the surveys by the inventors, the rough estimate of the facility construction cost created by the conventional method based on the unit price per square meter is about -20% to + 20% more than the detailed estimate (the original product) based on the design book etc. There is. Too many rough estimates are disadvantageous when making estimates, and too few rough estimates lead to a shortage of budget after the contract, so the development of a rough estimate system using a computer is being promoted to increase the accuracy of the estimates.

  For example, Patent Document 1 proposes an equipment rough automatic creation system for the purpose of improving the rough estimate accuracy of building equipment and the like. This system is based on the premise that there is some schematic design drawing that expresses the design intention even in the planning / basic design stage, and the schematic design drawing is created by CAD, and equipment members such as equipment, wiring, piping, ducts, etc. Schematic design drawing quantity calculation system that calculates unit quantity, compound unit price system that manages compound unit price (combined cost per member) for each equipment member, compound unit price of equipment unit that is a set of members (per unit) Unit cost system for managing the combined cost), and an approximate estimate system for creating integrated data by a stacking method from the number of equipment members in the schematic design drawing and the composite unit price for each equipment member or unit. In the combined unit price and unit unit price system, the latest combined unit price or unit unit price is set according to the price revision or the like. By creating a schematic design drawing in an interactive format with a computer by the schematic design drawing quantity calculation system, an accurate facility schematic estimate according to the schematic design drawing can be generated.

JP-A-6-348722 Tsuneo Shimamoto, Saburo Aikawa, “Architectural Encyclopedia 4th Edition, Chapter 9, Specifications / Estimation / Contract”, Science and Engineering, March 30, 1994

  However, the automatic facility rough creation system disclosed in Patent Document 1 is based on the premise that a rough design drawing exists at the time of rough estimation, and there is a problem that a rough estimate cannot be created without a rough design drawing. In the actual rough estimate, there are many cases where only a plan view of the building, an elevation view, and a simple equipment outline can be used, and a schematic design drawing (for example, equipment outline specification etc.) as in Patent Document 1 is created from these. 1 week to 10 days are required. The rough estimate may be required to be submitted in a short time (for example, 1-2 days). If there is not enough time, the actual situation is that the estimate work must be done without creating the equipment outline specifications. . Further, if it takes time for the estimation work, it is not possible to sufficiently examine the contents of the estimate (for example, consider cost reduction). Development of a system that can create a highly accurate rough estimate in a short time is desired.

  In addition, the system of Patent Document 1 has a problem that it is difficult to consider cost reduction as compared with the conventional method of calculating the facility construction cost based on the unit price, unit price, etc. of the actual project. The rough estimate in the planning / basic design stage is used for cost reduction examination (value engineering examination, hereinafter sometimes referred to as VE examination), for example, by comparing with a similar performance project. In order to increase the utility value of the rough estimate, it is necessary not only to increase the accuracy of the estimate but also to be easy to use for VE studies.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a building equipment cost estimation program capable of creating a rough estimate with high accuracy in a short time.

  As a result of conducting a survey comparing and examining compound costs for various building equipment classifications, the present inventors have found that the unit price per unit and unit price vary greatly depending on the equipment specifications and grades. Can be divided into basic specification items used in other buildings and additional specification items used selectively for each building. If you look at the equipment complex costs related to basic specification items, any specific item in the basic specification items The specification value (capacity, quantity, etc.) is greatly affected, and the specification value of the specific item and the composite cost are often proportional (including inverse proportion; the same applies hereinafter). In the range investigated by the present inventors, for example, the combined cost of the trunk line equipment is the cable copper weight, the combined cost of the water supply equipment is the capacity of the receiving tank, the combined cost of the sanitary equipment is the number of toilets, and the combined cost of the air conditioner equipment Was almost proportional to the cooling capacity.

  In addition, even if the basic classification items that are almost proportional to the composite cost cannot be found by the equipment classification in the investigation process, the inventors can specify the equipment cost that is almost proportional to the composite cost for each equipment classification by dividing and reorganizing the equipment classification. It was found that the basic specification items can be adjusted to exist. If the composite cost of a new project is estimated using specific basic specification items that are approximately proportional to the composite cost, it can be expected that a fairly accurate rough estimate can be created without the equipment outline specifications. Moreover, if this specific basic item is used to compare the composite cost and equipment density of new projects with those of actual projects, it can be expected that the rough estimate will be used for studies such as cost reduction. The present invention has been completed based on this idea.

Referring to FIG. 1, a building equipment cost estimation program according to the present invention uses a computer 1 for estimating a composite cost including equipment costs, labor costs and related expenses for equipment of a new building,
Record actual combined cost 34 for each subdivision 41s for each existing building as a real estate project along with the usage and scale 31 of building and specification values 32 and 33 for basic specification item A and additional specification item B for each subdivision 41s Achievement matter database 30 to do;
Equipment classification registration file 40 for managing the equipment sub-classification 41s by the upper equipment classification 41 collectively;
For each equipment classification 41 in the equipment classification registration file 40, the actual cases in the database 30 where the additional specification item B of the subclass 41s belonging to the equipment classification 41 is not recorded are sequentially read and the composite cost 34 of each subclass 41s is summarized. and a facility classification 41 different complex costs 34 ratio was calculated with the specification value 32 of the basic specification item a of each subdivision 41s, the ratio substantially constant and its facility classification 41 different complex costs 34 and specifications 32 Index specification detection means 11 for detecting the basic specification item A and its ratio as the index specification item C and its combined cost unit price 65 ;
For each equipment category 41 in the equipment category registration file 40, the actual items in the database 30 in which the additional specification item B of the subcategory 41s belonging to the equipment classification 41 is recorded are sequentially read for each additional specification item B , and the index specification item B The product of the specification value 33 and its composite cost unit price 65 is calculated, and the rate of increase / decrease of the composite cost 34 for each equipment category 41 that summarizes the composite cost 34 for each subclass 41s is calculated. Adjustment rate detecting means 12 for detecting the rate of increase / decrease of the composite cost 34 as the cost adjustment rate 64 for each additional specification item B ;
A new project input means 13 for inputting the usage and size 71 of the new building N and the index specification item C for each equipment classification 41 of the equipment classification registration file 40 and the predicted values 72 and 73 for each additional specification item B ;
Reference project selection means 16 for selecting a reference project R of similar use and scale 71 as the new building N from the actual project database 30 for each equipment category 41 of the new building N ;
Compounded as the quotient obtained by dividing the compound cost 34 for each equipment classification 41 of the reference project R by the equipment classification 41 in the equipment classification registration file 40 by the specification value 32 of the index specification item C and the cost adjustment rate 64 for each additional specification item B The cost unit price 85 is obtained, and the combined cost unit price 85, the predicted value 72 of the index specification item C of the new building N, and the cost adjustment rate 64 for each additional specification item B are estimated and combined by the equipment classification 41 of the new building N It functions as the cost calculation means 17 for calculating the cost 74.

Preferably, the optimum project detection means 19 for detecting the optimum project 51 for which the performance composite cost 34 satisfies the predetermined condition is provided from the actual project database 30 according to the usage and size 31 of the building, and the usage of the new building N and the reference project selection means 16 are provided. The optimum project 51 corresponding to the scale 71 is selected as the reference project R. More preferably, the cost output means 18 for outputting the estimated composite cost 74 and specifications 72 and 73 of the new building N and the actual composite cost 84 and specifications 82 and 83 of the reference project R for each equipment classification 41 of the equipment classification registration file 40 is provided. Provide.

The building equipment cost estimation program according to the present invention is a high-order equipment that summarizes equipment subcategories from an actual project database that stores actual compound costs for each equipment subclassification of existing buildings and specification values for basic specification items and additional specification items. the classification, index specification items of the basic specifications item in the ratio substantially proportional relationship between the complex costs and specifications of different equipment classification reads the actual projects additional specification item to the equipment classification not recorded the facility classification and it detects as to detect the rate of change equipment categorical complex cost reads the actual projects the additional specification item to equipment classification is recorded as a cost adjustment rate for each additional specification item, and novel building applications and scale from actual projects database in response to the input of the predicted value of the equipment categorical index specification items and additional specification items similar applications and scale of reference projects for each facility classification The estimated complex cost for each equipment category of the new building is calculated from the unit cost of the complex cost for the index item specification value for each equipment category of the reference project and the cost adjustment rate for each additional specification item. Play.

(A) Since the composite cost of a new building is estimated based on the index specification item that is approximately proportional to the composite cost for each equipment category, it is possible to create an approximate estimate with little variation with respect to the detail estimate (the original product).
(B) A fairly accurate rough estimate can be created in a short time only by inputting the predicted values of index specification items and additional specification items for each equipment category of the new building.
(C) As a reference project, the optimal project that satisfies the specified conditions in the actual project, for example, the latest actual project with the lowest actual combined cost can be automatically selected, and an appropriate rough estimate that reflects the market price is created. be able to.
(D) The combined costs of actual projects are managed together with the specification items of each equipment category, and reference projects with similar specification items can be selected based on the specification items of new projects. Occurrence can be avoided.
(E) Since it is possible to create a rough estimate by comparing the index specification items, additional specification items, and composite costs for each equipment category of the new project with those of the reference project, it is possible to easily examine the factors of cost increase and decrease for each equipment category. It is possible to create a rough estimate that can be used for cost reduction studies.

  FIG. 1 shows an embodiment of a computer system (hereinafter sometimes referred to as an estimation system) incorporating a building equipment cost estimation program according to the present invention. The computer 1 in the illustrated example has an input means 2 such as a pointing device / keyboard, an output means 3 such as a display / printer, and a storage means 20 for recording an actual case group (hereinafter referred to as an actual case database) 30 described later. Have. The storage means 20 in the illustrated example is provided with an equipment classification registration file 40, an optimum project registration file 50, an equipment specification item registration file 60, a new project registration file 70, and a reference project registration file 80, together with the actual project database 30. . The computer 1 in the illustrated example includes an index specification detection unit 11, an adjustment rate detection unit 12, a new item input unit 13, a reference item selection unit 16, a cost calculation unit 17, a cost output unit 18, an optimum case detection unit 19, and the like. The program group is installed.

  The actual project database 30 includes, for each actual project, the usage and size of the building 31, the specification values 32 and 33 for each basic specification item A and additional specification item B for each required equipment category 41, and the actual results for each equipment category 41. Record compound cost 34. The basic specification item A is an equipment specification item used in all buildings, and the additional specification item B is an equipment specification item selectively used in each building. For example, by registering the additional specification item B for each equipment category 41 in the equipment specification item registration file 60 described later, the basic specification item A and the additional specification item B of each equipment category 41 can be distinguished. FIG. 11 shows a list screen 39 of achievement cases recorded in the achievement case database 30. Each result case in the result case database 30 in the illustrated example includes an identifier (building name, etc.) 35 for identifying each, use 31a for offices, hospitals, schools, condominiums, etc., large, medium and small Etc., and the size classification 31b is recorded. As the size of the building, the total floor area, the number of units, etc. can be recorded in addition to or instead of the size classification 31b. In addition, facility specification values 32 and 33 and actual composite cost 34 are recorded for each facility category 41 for each track record.

  Building equipment can generally be broadly classified into water supply / drainage / sanitary equipment, electrical equipment, gas equipment, air-conditioning equipment, elevator equipment, etc., but in the contract or construction stage detailed estimate, the equipment subclassification 41s classified in more detail is often used. In the actual project database 30, for example, the facility specification values 32 and 33 and the actual composite cost 34 of each actual project are registered for each equipment sub-classification 41s based on the detailed estimate created by the accumulation method at the contract or construction stage of each actual project. .

The equipment classification 41 is managed by the equipment classification registration file 40. FIG. 7 shows an example of the registration screen 49 of the equipment classification registration file 40. For example, the required equipment classification 41 is registered in the equipment classification registration file 40 in the illustrated example (for example, the middle classification required for the rough estimate), and the equipment sub-classification 41s belonging to each equipment classification 41 is registered. By referring to this equipment classification registration file 40, the estimation system obtains the facility specification values 32 and 33 and the actual composite cost 34 of each actual project registered for each of the equipment subclasses 41s that are the lower classifications in the actual project database 30. They can be grouped according to the equipment classification 41 which is the upper classification. In the present invention, as described later, it is necessary to define specific basic specification items (index specification items) that are substantially proportional to the composite cost for each equipment category 41. Therefore, each equipment category 41 is provided with a single index specification item. A classification registration file 40 can be created. If necessary, the index specification detection means 11 to be described later, the equipment classification registration file 40 of facility classification 41 respectively reorganize the facilities subclassified 41s as an index specification item alone is determined by a suitable lower equipment classification It can be divided into 41a (see FIG. 8).

The specification items for each equipment classification 41 are managed by the equipment specification item registration file 60. FIG. 8 shows an example of the registration screen 69 of the equipment specification item registration file 60. The registration screen 69 in the illustrated example designates one of the equipment classifications 41a from the list of equipment classifications 41a on the right side of the figure, and classifies the combined costs 34 of the subclasses 41s belonging to the designated equipment classification 41a. Index specification item C that is substantially proportional to the composite cost of the index, ratio of the index specification item C to the composite cost (composite cost unit price by the index specification item C) 65, additional specification item B, and cost adjustment rate 64 for each additional specification item B Is registered in each column on the left side of the figure. The equipment classification 41a in the illustrated example is registered by dividing and reorganizing the equipment classification 41 of the equipment classification registration file 40 of FIG. 7, and each equipment classification 41a is assigned a number associated with the equipment classification 41. Has been. It is sufficient that the cost adjustment rate 64 is registered for the additional specification item B that requires adjustment of the composite cost. Registration of the equipment classification 41a in the equipment specification item registration file 60, registration of the index specification item C of each equipment classification 41a and the composite cost unit price 65 can be automatically performed by the index specification detecting means 11 described later. Further, the registration of the cost adjustment rate 64 for each additional specification item B of each equipment category 41a can be automatically performed by the adjustment rate detection means 12 described later. Therefore, it is sufficient to register only the additional specification item B of each equipment classification 41a in the equipment specification item registration file 60 in advance.

  FIG. 2 shows an example of a flowchart of a construction facility cost estimation method using the program group of FIG. The cost estimation program according to the present invention will be described below with reference to the flowchart. First, in step S001, the above-described actual case database 30 is constructed using the detailed estimate (original product) data of past actual cases. Next, in steps S002 to S003, necessary items are registered in the equipment specification item registration file 60 based on the actual result database 30 and the equipment classification registration file 40. That is, in step S002, the index specification detection means 11 detects the basic specification item A in which the composite cost 34 and the specification value are approximately proportional to each equipment classification 41 from the actual matter database 30 and installs the equipment in the equipment specification item registration file 60. The index specification item C classified by classification 41 is registered. In step S003, the adjustment rate detecting means 12 detects the rate of increase / decrease of the composite cost 34 for each additional specification item B from the actual matter database 30 for each equipment category 41, and adds it to the equipment specification item registration file 60 for each equipment category 41. The cost adjustment rate 64 of the specification item B is registered.

FIG. 3 shows an example of a flow chart of registration of the equipment specification item registration file 60 by the index specification detection means 11 (detailed flow chart of step S002 in FIG. 2). In step S101 of FIG. 3, the equipment specification registration unit 40 reads the equipment classification registration file 40 and designates any equipment classification 41 (for example, equipment classification 41 registered at the head). Next, in step S102, the actual cases recorded in the actual case database 30 are read sequentially, and the additional specification item B registered in the equipment specification item registration file 60 is referenced, and the subcategory 41s belonging to the specified equipment category 41 is added. A track record in which the specification item B is not recorded is extracted (step S104). For the basic specification item A of each subcategory 41s belonging to the equipment category 41 of the extracted actual project, the actual value compound cost 34 for the specification value 32 and the basic specification item A of the equipment category 41 (for each subcategory 41s belonging to the equipment category 41) A ratio with the actual composite cost 34) for each equipment category 41 that summarizes the composite cost 34 is calculated (step S105). Steps S102 to S105 are repeated for each actual case recorded in the actual case database 30, and after reading all cases, the process proceeds from step S103 to step S106. It is determined whether or not there is an item whose ratio with the specification value 32 is substantially constant (steps S106 to S107). When the basic specification item A having a substantially constant ratio is detected, the process proceeds to steps S109 to S110, where the detected basic specification item A is used as the index specification item C of the equipment classification 41, and the ratio is combined by the index specification item C. The cost unit price 65 is registered in the equipment specification item registration file 60.

In step S107 of FIG. 3, if an appropriate index specification item C whose ratio to the actual combined cost 34 related to the basic specification item A is almost constant cannot be detected, the process proceeds to step S108, and the designated equipment classification 41 is changed to the equipment fine classification 41s. The steps S102 to S106 are repeated after dividing into the lower equipment classification 41a by reorganization. In steps S107 to S108, by dividing the equipment classification 41 into a plurality of lower equipment classifications 41a based on the equipment sub- classification 41s, it is easy to detect the basic specification item A in which the specification value 32 and the actual composite cost 34 are substantially proportional. Become. In steps S102 to S106, it is determined whether or not there is a basic specification item A in which the actual composite cost 34 and the specification value 32 are approximately proportional to each of the divided and reorganized equipment classifications 41a. If there is, the equipment classification 41a divided and reorganized is registered in the equipment specification item registration file 60, and the index specification item C and the combined cost unit price 65 of each equipment classification 41a after the division and reorganization are equipment specifications. Register in the item registration file 60. When it cannot detect, it progresses to step S108 again, the equipment classification 41a is further divided and reorganized, and steps S102 to S106 are repeated.

  In step S111 of FIG. 3, it is determined whether or not the index specification item C has been registered for all the equipment classifications 41 registered in the equipment classification registration file 40, and there is a facility classification 41 for which the index specification item C has not been registered. Returns to step S101 and repeats steps S102 to S110 described above. FIG. 8 shows an example of the equipment specification item registration file 60 registered by the index specification detecting means 11 in accordance with the flowchart of FIG. In this equipment specification item registration file 60, the equipment classification 41 registered as “telephone equipment” in the equipment classification file 40 is drawn into the telephone, and divided into four equipment classifications 41a of telephone equipment, telephone terminal board, and telephone piping. The index specification item C and its combined cost unit price 65 are registered for each equipment category 41a. In addition, the equipment classification 41 registered as “information equipment” in the equipment classification file 40 is classified into eight equipments: a housing information panel, sub information panel, door phone, chime, additional speaker, bath / toilet appliance, gas sensor, and security sensor. It is divided and classified into classification 41a. According to the flowchart of FIG. 3, a single index specification item C can be determined for each equipment category 41a.

  However, in step S107 of FIG. 3, although the index specification item C that greatly affects the actual composite cost 34 related to the basic specification item A can be detected, the ratio between the specification value 32 of the index specification item C and the actual composite cost 34 is constant. It may not be. According to the inventors' investigation, for example, the actual combined cost 34 of the equipment classification 41 such as receiving / transforming equipment and private generator equipment is greatly affected by the transformer capacity, but the ratio of the actual combined cost 34 and the transformer capacity is It is not always constant. Such equipment classification 41 can be assumed in advance, and its index specification item C can also be assumed in advance. For such equipment classification 41, the index specification detection means 11 repeats steps S102 to S105, and then proceeds to step S109. Only the index specification item C of the equipment classification 41 is registered in the equipment specification item registration file 60, and step S110 In FIG. 9, instead of registering the composite cost unit price 65 in the equipment specification item registration file 60, a list 67 (see FIG. 9) of the composite cost unit price 65 corresponding to the specification value of the index specification item C is created and stored. Can record to 20. FIG. 9 shows an example of a screen 68 for displaying or updating the composite cost unit price list 67. In this case, at the time of the composite cost estimation of the new case N, the composite cost unit price 65 corresponding to the predicted value of the index specification item C of the new case N is appropriately selected from the list 67.

FIG. 4 shows an example of a flow chart of registration of the equipment specification item registration file 60 by the adjustment rate detection means 12 (detailed flow chart of step S003 in FIG. 2). In steps S201 to S203 of FIG. 4, the equipment specification item registration file 60 registered in accordance with the flowchart of FIG. 3 is read by the adjustment rate detecting means 12, and one of the equipment classifications 41a is designated to designate the index specification item C and its composite cost. The unit price 65 (or the combined cost unit price list 67 of FIG. 9) is taken in, and any additional specification item B registered in the equipment classification 41a is designated. In steps S204 to S206, all the actual cases recorded in the actual case database 30 are sequentially read, and the actual cases in which only the designated additional specification item B is recorded are extracted. In step S207, the product of the specification value 32 of the index specification item C of the facility classification 41a of the extracted actual project and the composite cost unit price 65 of the index specification item C is calculated, and the basic specification part of the facility classification 41a of the actual project is calculated. Calculate compound costs. Further in step S208, the extracted track record projects equipment classification 41a-specific performance composite cost 34 (Actual complex cost 34 complex cost 34 a different facility classification 41a summarizes each fine classification 41s belonging to equipment classification 41a), basic specifications Calculate the rate of increase / decrease with respect to the composite cost of the part Steps S204 to S208 are repeated for each actual case recorded in the actual case database 30, and after reading all cases, the process proceeds from step S205 to step S209, and the average value of the increase / decrease rate of the composite cost 34 by the designated additional specification item B is calculated. The average value is detected and registered in the equipment specification item registration file 60 as the cost adjustment rate 64 of the additional specification item B.

  In step S210 of FIG. 4, it is determined whether or not the cost adjustment rate 64 has been registered for all the additional specification items B of the equipment classification 41a. If there is an unregistered additional specification item B, the process returns to step S203 and described above. Steps S204 to S209 are repeated. In step S211, it is determined whether or not there is another equipment classification 41a in the equipment specification item registration file 60. If there is another equipment classification 41a, the process returns to step S201 and the above-described steps S202 to S210 are repeated. The necessary cost adjustment rate 64 can be registered for each of the additional specification items B registered in each facility classification 41a of the facility specification item registration file 60, according to the flowchart of FIG. FIG. 8 shows an example of the cost adjustment rate 64 of the additional specification item B registered by the adjustment rate detection means 12 according to the flowchart of FIG.

  Returning to the flowchart of FIG. 2 again, in step S004, the optimum case detection means 19 detects the optimum case 51 in which the result composite cost 34 satisfies the predetermined condition from the result case database 30 for each use and size 31 of the building. For example, the optimum project detection means 19 uses the performance project database 30 to record the actual project with the lowest or average actual composite cost from the actual project database 30 based on conditions such as “the actual composite cost is the lowest (or average)”. Extract them by 31 and register them in the optimum item registration file 50. FIG. 10 shows an example of a screen 59 for displaying or updating the optimum case 51 registered in the optimum case registration file 50. In the optimum case registration file 50 in the illustrated example, the identifier (building name, etc.) of the optimum case 51 extracted from the actual case database 30 is registered for each use and scale 31. The optimum case detection means 19 can extract and register the latest optimum case 51 from the actual case database 30 as appropriate. However, if it is difficult to set conditions, the optimum case registration file 50 can be set manually. The optimum item 51 registered in the optimum item registration file 50 can be used as a reference item (benchmark item) at the time of estimating the equipment cost of a new item by the reference item selection means 16 described later.

  In step S005 of FIG. 2, the new case input means 13 causes the use and scale 71 of the new case N, the predicted value 72 of the index specification item C for each equipment category 41a, and the predicted value of the additional specification item B for each equipment category 41a. 73 is recorded in the new Item registration file 70. FIG. 12 shows an example of the usage / scale input screen 14 of the new case input means 13 activated by pressing the new case input button 36 in the actual case list screen 39 of FIG. In the usage / scale input screen 14 of the illustrated example, an identifier (building name, etc.) 76 of the new case N is entered, and the usage and scale 31 registered in the optimum case registration file 50 as the usage and scale 71 of the new case N Select one. In addition, the total floor area, the number of units, etc. are entered as the building scale.

  FIG. 13 shows an example of the equipment specification input screen 15 of the new item input means 13 that is activated after the input of the use / scale input screen 14 of FIG. 12 is completed. On the right side of the equipment specification input screen 15 in the illustrated example, a list of equipment classifications 41a registered in the equipment specification item registration file 60 is displayed. If any equipment classification 41a is specified from the list of equipment classification 41a, the cost for each index specification item C, additional specification item B, and additional specification item B of that equipment classification 41a registered in the equipment specification item registration file 60 The adjustment rate 64 is displayed in each upper left column of the equipment specification input screen 15. The predicted value 72 of the index specification item C for each equipment classification 41a of the new project N and the predicted value 73 of the additional specification item B are input to the respective fields on the upper left side of the screen 15 while switching the equipment classification 41a.

  In step S006, the reference item selection means 16 selects a reference item R having the same or similar use and scale as the new item N from the actual item database 30 and registers it in the reference item registration file 80. For example, the reference item selecting means 16 selects the optimum item 51 (see FIG. 10) registered in the optimum item registration file 50 according to the use and scale 71 of the new item N input on the use / scale input screen 14 in FIG. The facility is selected as a reference project R, and the equipment specification values 32 and 33 and the actual composite cost 34 of the selected reference project R are read from the actual project database 30 and registered in the reference project registration file 80 for each equipment classification 41a. In the reference case registration file 80, the total floor area, the number of units, etc. of the reference case R recorded in the result case database 30 can also be registered. The combined actual cost 84 for each equipment classification 41a of the reference case R registered in the reference case registration file 80, the specification value 82 of the index specification item C, and the specification value 83 of the additional specification item B are shown in the equipment specification input screen of FIG. In accordance with the equipment classification 41a specified on the right side of 15, it is displayed in each column on the lower left side of the screen 15. Therefore, on the facility specification input screen 15, the predicted value 72 of the index specification item C of the new project N and the predicted value 73 of the additional specification item B are input while referring to the specification values 82 and 83 and the actual cost 84 of the reference project R. can do.

  The reference item selection means 16 can select an appropriate reference item R from the actual item database 30 in accordance with the use and scale 71 of the new item N and the equipment classification 41a as well as the optimum item 51. FIG. 14 shows an example of a reference item selection screen 89 that is activated by pressing a reference item selection button 88 on the equipment specification input screen 15. In the selection screen 89 in the illustrated example, the corresponding actual projects are extracted from the actual project database 30 according to the use and scale 71 of the new project N and the equipment classification 41a specified on the equipment specification input screen 15 and displayed in a list. The As shown in the illustrated example, the selection screen 89 includes the additional specification item designation screen 89a, and only the actual cases having a specific additional specification item B (for example, the additional specification item B of the new case N) may be extracted and displayed as a list. Is possible. The reference project selection means 16 selects the actual project designated on the selection screen 89 as the reference project R, and stores the equipment specification values 32 and 33 of the equipment classification 41a of the designated reference project R and the actual composite cost 34 in the actual project database. Read from 30 and register in the reference item registration file 80. For the equipment classification 41a in which the reference project R is registered in the reference project registration file 80, a reference project existence mark 87 is displayed in the equipment classification list on the equipment specification input screen 15 in FIG.

In step S007, the equipment classification of the new project N based on the predicted value 72 of the index specification item C of the new project N and the predicted value 73 of the additional specification item B input to the facility specification input screen 15 by the cost calculation means 18 Calculate the estimated combined cost 74 for each 41a. Specifically, the composite cost 84 for each equipment classification 41a of the reference project R displayed on the equipment specification input screen 15 is divided by the specification value 82 of the index specification item C and the cost adjustment rate 64 for each additional specification item B. A compound cost unit price 85 based on the index specification item C is calculated as a quotient . From this composite cost 85 and the predicted value 72 of the index specification item C for each equipment category 41a of the new project N, the composite cost of the basic specification part of the new project N is calculated. Furthermore, based on the predicted value 73 of the additional specification item B for each equipment classification 41a of the new project N, the equipment classification of the new project N is calculated by multiplying the compound cost of the basic specification part by the cost adjustment rate 64 for each additional specification item B. Calculate the estimated combined cost 74 for each 41a.

  In the equipment specification input screen 15 of FIG. 13, the composite cost unit price 85 of the reference case R can be copied to the composite cost unit price 75 of the new case N by pressing the copy button 86. When the additional specification item B of the new item N is input, the product of the cost adjustment rate 64 of the additional item B and the compound cost unit price 85 of the reference item R is copied to the compound cost unit cost 75 of the new item N . In addition, for the equipment classification 41a for which the composite cost unit price list 67 for power receiving / transforming equipment, private generator equipment, etc. has been created, the index is displayed from the composite cost unit price list 67 (see FIG. 9) by pressing the list display button 79. The composite cost unit price 65 corresponding to the predicted value 72 of the specification item C can be automatically or appropriately selected and copied to the composite cost unit price 75 of the new case N. The cost calculation means 18 calculates an estimated composite cost 74 for each equipment category 41a of the new case N based on the composite cost unit price 75 of the copied new case N.

  In step S008, it is determined whether or not the estimated composite cost 74 has been calculated for all equipment classifications 41a of the new project N. If there is an equipment classification 41a for which the estimated composite cost 74 has not been calculated, the process returns to step S005 and described above. Steps S005 to S007 are repeated. After calculating the estimated composite cost 74 for all equipment classifications 41a, the cost output means 18 can output and check a list of the estimated composite costs 74 for each equipment classification 41a of the new project N in step S009. FIG. 15 shows an example of the estimated composite cost summary table 91 for each equipment category 41 output by pressing the summary table output button 77 on the equipment specification input screen 15 (FIG. 13). The tabulation table 91 in the illustrated example is obtained by tabulating the estimated composite cost 74 calculated for each equipment classification 41a on the equipment specification input screen 15 for each equipment classification 41 registered in the equipment classification registration file 40 (see FIG. 7). This is equivalent to the conventional rough estimate.

  In step S010, the contents of the rough estimate created for the new case N are examined, and if it is necessary to create another estimate, the process returns to step S005, and steps S005 to S009 are repeated. The rough estimate after the contents examination can be recorded in the actual matter database 30 so as to be distinguishable from other actual cases. If it is necessary to create an estimate for another new case N, the process returns from step S011 to step S005, and steps S005 to S010 are repeated. When re-registering the equipment specification item registration file 60 and the optimum project registration file 50 based on the contents of the latest actual project database 30, the process may return to step S002 and repeat steps S002 to S010.

  The predicted values 72 and 73 of the index specification item C and the additional specification item B for each equipment category 41a of the new project N can be predicted relatively easily from the equipment summary of the new project N and the like. Therefore, according to the flowchart of FIG. 2, it is possible to create a rough estimate of a new case N that is fairly accurate in a short time without creating a schematic design drawing as in Patent Document 1. In the illustrated example, the estimated composite cost 74 of the new project N is calculated using not only the composite cost unit price 85 based on the index specification item C but also the composite cost unit price (unit price per unit, unit price) based on the scale of the reference project R. It is also possible. That is, in step S007, the unit price or the unit price of the reference project R is copied to the combined cost unit price 75 of the new project N, and the cost calculation means 18 calculates the total floor area or the number of units of the new project N and the combined cost unit price 75. The estimated composite cost 74 for each equipment category 41a can be calculated. Therefore, for the equipment classification 41a for which it is difficult to predict the predicted values 72 and 73 of the index specification item C and the additional specification item B from the equipment summary, etc., the new project N You can create an approximate estimate.

  As a result of comparing the rough estimate prepared in accordance with the flowchart of FIG. 2 and the detailed estimate (original product) based on the design book, etc., the present inventors have found that there is a slight difference depending on the equipment classification 41. In large-scale housing projects, variations were suppressed to about + 10%, in large-scale office projects, about -1% to + 4%, medium-scale office projects, about + 5%, and studio apartment projects, about -1%. In addition, the time for preparing the rough estimate was about 1/3 of that of the prior art, and sufficient study time could be taken. That is, according to the present invention, it was confirmed that an approximate estimate of the entire equipment construction cost can be created in a short time with high accuracy. Further, according to the present invention, the accuracy of the rough estimate can be improved by reviewing the index specification item C for each equipment classification 41, the cost adjustment rate 64 of the additional specification item B, the optimum item 51, etc. according to the accumulation of the result item database 30. Further enhancement can be expected. Moreover, since the present invention can create an approximate estimate based on the latest lowest price item in the achievement item database 30, an appropriate approximate estimate that always reflects the market price can be generated.

  Thus, the provision of a “building equipment cost estimation program capable of creating a rough estimate with high accuracy in a short time”, which is an object of the present invention, can be achieved.

In the embodiment of FIG. 1, the cost output means 18 makes it possible to compare the estimated composite cost 74 and specifications 72 and 73 of the new project N with the actual composite cost 84 and specifications 82 and 83 of the reference project R for each equipment category 41. Can be output. FIG. 16 shows an example of the estimated cost / specification comparison table 90 for each equipment category 41 output by pressing the comparison table output button 78 on the equipment specification input screen 15 (FIG. 13). According to the comparison table 90 of the illustrated example, the construction scope and equipment specifications are clearly shown along with the estimated cost. For example, when referring to the rough estimate at the planning / design stage at the time of the detailed estimate at the contract / construction stage, the specification Occurrence of estimation errors due to differences can be avoided. Further, even when a contract is made using the rough estimate 91 shown in FIG. 15, the construction range and facility specifications can be clearly indicated by the comparison table 90 shown in FIG .

In addition, the cost / specification comparison table 90 of FIG. 16 shows the density of the specification value 82 of the index specification item for the scale (total floor area or number of units) of the new project N (the specification value of the index specification item for the scale of the new project N). Ratio) 94 and the density of the predicted value 72 of the index specification item for the size of the reference building R (total floor area or number of units) (ratio of the predicted value of the index specification item to the size of the reference building R) 95 (Unit area, capacity / quantity of equipment per unit dwelling, etc.) can be displayed as 94, 95 for comparison. Furthermore, the density ratio 93 of the equipment density 94 of the new project N to the equipment density 95 of the reference building R can be displayed together. By comparing the equipment densities 94 and 95 of the new project N and the reference project R, it is possible to determine the validity of the estimated composite cost 74 by the equipment classification 41a of the new project N. Further, by comparing the density ratio 93 between the equipment densities 94 and 95 of the equipment class 41a, it is possible to find the equipment class 41a to be considered for cost reduction. For example, the cost / specification comparison table 90 can be used for VE examination by rearranging and outputting the density ratio 93 between the equipment densities 94 and 95 in ascending or descending order. In the present invention, the equipment density 94, 95 and the density ratio 93 can be displayed not only on the cost / specification comparison table 90 but also on the equipment specification input screen 15. Therefore, the new project N can be predicted while considering cost reduction. It is also possible to input values 72 and 73.

Also, the cost / specification comparison table 90 of FIG. The cost output means 18 in the illustrated example is a product of the input unit price increase / decrease rate 92 and the composite cost unit price 85 based on the index specification item C of each equipment classification 41a of the new project N, and the scale (total floor area, number of units, etc.) The unit price increase / decrease means (not shown) for uniformly increasing / decreasing the combined cost unit price 85 is provided, and the cost / specification comparison table 90 or the cost summary table 91 (see FIG. 15) can be prepared by the unit price increase / decrease rate 92. When creating an estimate, it may be necessary to adjust the estimated cost for various reasons. However, as shown in the example shown in the figure, the unit price of all equipment classifications 41a is increased or decreased according to the input of the unit price increase / decrease rate 92. It is possible to adjust the estimated composite cost 74 according to the predicted values 72 and 73 of the index specification item C and the additional specification item B of the new project N while maintaining the mutual balance of the composite cost 74.

  The present invention can be used not only for creating a rough estimate but also for evaluating and verifying the validity of a detailed estimate by comparing it with a rough estimate when creating a detailed estimate. FIG. 5 shows an example of a flowchart of a process for evaluating and verifying validity using the program of the present invention when creating a detailed estimate based on a design document. In step S301, predicted values 72 and 73 of the index specification item C and additional specification item B of the new item N (in this case, new based on the design document) are displayed on the equipment specification input screen 15 (see FIG. 13) of the new item input means 13. The design value of case N) is input, and the rough estimate recorded in the actual case database 30 as the reference case R is called and displayed in step S302. In step S303, by comparing the two, it is possible to create a detailed estimate based on the design document while confirming the validity of the predicted values 72 and 73 at the time of the rough estimate for each equipment classification 41a of the new project N. Also, after inputting the new project N data 72 and 73 based on the design document for all equipment classifications 41a (step S304), the cost / specification comparison table 90 (see FIG. 16) is output in steps S305 to S306, and the equipment classifications are made. By comparing the equipment density 94, 95 of 41a and the density ratio 93 between each other, it is possible to evaluate and verify the overall validity of the rough estimate and the detailed estimate.

  FIG. 6 shows an embodiment of the estimation system according to the present invention using the network 6. In the illustrated example, for example, the record item database 30, the equipment classification registration file 40, the optimum case registration file 50, the equipment specification item registration file 60, etc. are recorded in the storage means 20 of the computer 1 of the head office, and the new items to be installed in the computer 1 are shown. The case input means 13 includes communication means (not shown) for inputting an input value via the network 6, and the cost output means 18 includes communication means (not shown) for outputting the output value via the network 6. For example, predicted values 72 and 73 of new projects are input to the computer 1 via the network 6 from the terminals 5a to 5f of each branch, and the estimated cost / specification comparison table 90 and the estimated composite cost summary table 91 are transmitted via the network 6 to the terminals 5a to 5f. Can output to 5f. By adopting a system using the network 6 as shown in the illustrated example, it can be expected to propose an accurate rough estimate reflecting the construction contents and specifications in front of the owner or consultant, for example.

It is a block diagram of a computer system using a cost estimation program according to the present invention. It is an example of the flowchart of the cost estimation program by this invention. It is an example of the flowchart of the process which detects the index specification item according to equipment classification. It is an example of the flowchart of the process which detects the cost adjustment rate according to equipment classification and additional specification items. It is an example of the flowchart of the construction equipment cost evaluation method using the program by this invention. It is explanatory drawing which shows the Example of this invention using a network. It is explanatory drawing of an example of an equipment classification registration file. It is explanatory drawing of an example of an equipment specification item registration file. It is explanatory drawing of an example of a composite cost unit price list. It is explanatory drawing of an example of the optimal case registration file. It is explanatory drawing of an example of a performance project database. It is explanatory drawing of an example of the use / scale input screen by a new case input means. It is explanatory drawing of an example of the equipment specification input screen by a new project input means. It is explanatory drawing of an example of a reference project selection screen. It is explanatory drawing of an example of an estimated composite cost totalization table. It is explanatory drawing of an example of an estimated cost and specification comparison table.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Computer 2 ... Input means 3 ... Output means 5 ... Terminal 6 ... Network
11 ... Indicator specification detection means 12 ... Adjustment rate detection means
13… New item input means 14… Use / scale input screen
15 ... Equipment specification input screen 16 ... Reference item selection means
17 ... Cost calculation means 18 ... Cost output means
19 ... Optimal case detection means 20 ... Memory means
30… Results project database
31… Use / scale (for actual projects)
32… Specification values by basic specification items (for actual projects)
33 ... Specification value for each additional specification item (for actual projects)
34 ... Actual combined cost by equipment category (of actual projects)
35… Result matter identifier 36… New matter entry button
39… Results project list screen 40… Equipment classification registration file
41 ... Equipment classification
41a ... Equipment classification (after division / reorganization)
41s… Facility sub-classification 49… Facility classification registration screen
50 ... Optimal Item Registration File
51: Optimal projects by application and scale
59… Optimum item screen
60 ... Equipment specification item registration file
64: Cost adjustment rate by additional specification item
65 ... Compound cost unit price 67 ... Compound cost unit price list
68… Composite cost unit price list screen
69… Equipment specification item registration screen
70 ... New matter registration file
71… Use / scale (for new projects)
72 ... Estimated value of index specification item (for new item)
73… Predicted value for each additional specification item (new item)
74 ... Estimated composite cost by equipment category (for new projects)
75 ... Compound cost unit price by equipment category (for new projects)
76: New matter identifier
77 ... Total table output button 78 ... Comparison table output button
79… List display button
80 ... Reference Item Registration File
81… Use / scale (for reference)
82… Specification value by index specification item (for reference project)
83 ... Specification value for each additional specification item (for reference)
84 ... Actual combined cost by equipment category (for reference project)
85… Combined unit cost by equipment category (for reference project)
86… Reference project copy button 87… Reference project presence / absence mark
88… Reference item selection button
89… Reference project selection screen 89a… Optional specification item specification screen
90 ... Cost / Specification Comparison Table
91 ... Estimated composite cost summary table
92 ... Unit price change rate
93 ... Ratio of equipment density between new and reference projects
94 ... New project equipment density
95 ... Equipment density of reference project A ... Basic specification item B ... Additional specification item C ... Indicator specification item N ... New project (new building)
R ... Reference project

Claims (7)

Computers to estimate complex costs including equipment costs, labor costs and related costs for new building equipment,
Actual case database that records facilities fine categorical performance composite cost per existing buildings as actual transactions with specifications of each basic specification item and the additional specification items of the application and the size and the equipment subdivided classification of the building;
Equipment classification registration file that manages equipment sub-classification by high-level equipment classification;
For each equipment classification in the equipment classification registration file, the actual cost in the database that does not record the additional specification items of the fine classification belonging to the equipment classification is sequentially read, and the composite cost by equipment classification that summarizes the composite cost of each fine classification calculating a ratio of the specification value of the basic specification item of each subdivision, basic specification items and index specification the ratio ratio of the equipment categorical complex costs and specifications is substantially constant items and the complex unit cost Index specification detecting means for detecting as;
For each equipment category in the equipment classification registration file, the actual projects in the database in which the additional specification items belonging to the equipment classification are recorded are sequentially read for each additional specification item, and the specification value of the index specification item and its combined cost unit price Calculate the rate of increase / decrease of the composite cost for each equipment category that summarizes the composite cost of each subcategory, and use the rate of increase / decrease of the composite cost for each equipment category as the cost adjustment rate for each additional specification item. Adjustment rate detecting means for detecting ;
New project input means for inputting the index specification item for each building category in the building classification registration file and the predicted value for each additional specification item in the building classification registration file ;
Reference project selection means for selecting a reference project of similar use and scale as the new building from the actual project database for each equipment category of the new building ; and
For each equipment classification in the equipment classification registration file, obtain the composite cost unit price as the quotient obtained by dividing the composite cost for each equipment classification of the reference project by the specification value of the index specification item and the cost adjustment rate for each additional specification item. A building equipment cost estimation program that functions as a cost calculation means for calculating an estimated composite cost for each equipment category of a new building as a product of a unit price, a predicted value of an index specification item of a new building, and a cost adjustment rate for each additional specification item. 2. The program according to claim 1, further comprising: an optimum case detecting means for detecting an optimum case for which the composite performance cost satisfies a predetermined condition for each use and size of the building from the result matter database, and the use and scale of the new building by the reference matter selecting means. Building equipment cost estimation program that selects the optimal project according to the project as a reference project. In the program of Claim 1 or 2 ,
Providing an equipment specification item registration file for dividing and registering each equipment classification of the equipment registration classification file into a lower equipment classification by reorganizing the equipment fine classification;
The index specification detection means reorganizes the subcategory of each equipment category in the equipment registration classification file and divides it into subordinate equipment classifications, and determines whether a single index specification item is determined for each equipment classification. And registering the equipment classification for which a single index specification item is determined in the equipment specification item registration file, and detecting the index specification item for each equipment classification in the equipment specification item registration file;
Detecting the cost adjustment rate for each additional specification item for each equipment classification of the equipment specification item registration file by the adjustment rate detecting means;
By the new item input means, the index specification item of the new building and the predicted value for each additional specification item are input for each equipment classification of the equipment specification item registration file;
A building equipment cost estimation program in which the cost calculation means calculates an estimated composite cost of a new building for each equipment classification of the equipment specification item registration file . 4. The building equipment according to claim 1, wherein a cost output means is provided for outputting the estimated composite cost and specification of a new building and the actual composite cost and specification of a reference project for each equipment classification in the equipment classification registration file. Cost estimation program. 5. The program according to claim 4 , wherein the cost output means calculates a ratio of the specification value of the index specification item to the scale of the new building and the reference project, and outputs the ratio as a facility density so that the comparison is possible. . According to claim 4 or 5 programs, with inclusion of input means bid change rate in the cost output unit, unit price increases or decreases uniformly equipment categorical estimated composite cost of new buildings by the product of the input rate of change increases or decreases Building equipment cost estimation program including means. 7. The program according to claim 4 , wherein the new matter input means includes communication means for inputting an input value via a network, and the cost output means includes communication means for outputting an output value via the network. Building equipment cost estimation program.