JP2023044537A - Bidding system for building - Google Patents

Abstract

To provide a bidding system capable of rationally establishing a land utilization business as a business.SOLUTION: A bidding system 10 for a building includes: a construction cost bidding device 300 that, on the basis of a design of a building having a plurality of sections to be independently sold and bought, causes builders to bid on at least a construction cost of the building through telecommunication lines; and a section bidding device 400 that, on the basis of the design, presents a sales reference price for each of the sections and causes people who want to purchase to bid. The section bidding device varies the sales reference price according to bid amounts for the construction cost of the building.SELECTED DRAWING: Figure 1

Description

The present invention relates to a building bidding system.

Patent Document 1 discloses a matching system that can obtain an agreement on building construction on idle land, etc., in which a building company that browses land information entered by a land provider is asked to enter a building plan including the required amount of investment. , After the land provider has agreed to the construction plan, the investor who searched for the construction plan is asked to enter investment information including the desired investment amount, and based on the input investment information and matching data, the required investment amount is It is described that when it is determined that the destination has been reached, the matching establishment information is output.

In the matching system described in the same document, investors are included in the construction plan, such as the investment amount per unit, the name and branch name of the construction company that designs and implements, the construction period, the name of the guarantee company, etc. is confirmed to determine whether or not there is participation in the building plan (paragraph 0052).

Patent Literature 2 describes an automatic CAD design system that automatically designs a building corresponding to site information.

Japanese Patent Application Laid-Open No. 2004-178090 JP 2013-228825 A

In order to rationally establish a land utilization business that makes a profit by constructing a building with a large number of sales divisions such as collective housing and selling the divisions as land utilization, a construction plan and its building The construction cost for each section must match the sales price and actual sales volume of each section. However, although the selling price of each plot is determined by taking into consideration the market price of the land to be used, it is largely an estimate, and the land utilization project may end in failure or the land utilization project may not be carried out. There is a risk that the profit as a business may be too small due to giving too much priority to

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and its object is to provide a bidding system that can rationally establish a land utilization business as a business.

The invention disclosed in the present application for solving the above problems has various aspects, and the outlines of typical aspects are as follows.

(1) A building cost bidding device that allows a builder to bid at least the building cost of the building through a telecommunication line based on the design of a building having a plurality of sections that are independently sold and sold; and a block bidding device that presents a sales base price for each of the blocks based on the base price and prompts a potential purchaser to bid, wherein the block bidding device sets the sales base price to the construction price of the building. Vary according to the bid amount for the cost,
Building bidding system.

(2) The building bidding system in (1), wherein the selling price is the minimum selling price of the parcel, and the parcel bidding device allows the prospective purchaser to bid for the purchase price of the parcel.

(3) In (1), the base selling price is the base selling price of the block, and the block bidding device causes the prospective purchaser to bid a premium amount added to the base selling price. bidding system.

(4) In any one of (1) to (3), based on both the bid amount for the construction cost of the building and the bid status and bid amount for the plurality of sections, A bidding system for a building having a propriety determination device that determines propriety of execution of a building plan.

(5) In (4), whether or not the construction plan of the building can be executed is determined by the amount obtained by adding the necessary profit to the bid amount for the construction cost of the building, the predetermined fixed cost, and the plurality of sections. A bidding system for a building, determined by comparing the sum of the bids for

(6) In (4) or (5), a plurality of the designs are prepared, and the construction cost bidding device causes the builder to bid at least the construction cost of the building for each of the plurality of designs, and The block bidding device presents the standard sales price for each of the blocks for each of the plurality of designs, and causes the potential purchaser to bid. A bidding system for a building that determines whether or not a construction plan for the building can be executed based on both the bid amount for the construction cost of the object and the bid status and bid amount for the plurality of sections.

(7) In (6), the feasibility determination device selects the design with the greatest amount of profit from among the designs that satisfy conditions determined to be feasible at the time when a predetermined bidding period has elapsed. A building bidding system that judges execution of a building plan for an object.

(8) In (6), when any one of the plurality of designs satisfies a condition for being determined to be executable, the construction plan of the building can be executed for the design. A bidding system for buildings that judges.

1 is a conceptual diagram showing the overall configuration of a building bidding system according to a preferred embodiment of the present invention; FIG. 1 is a configuration diagram showing a typical physical configuration of a general computer; FIG. It is a flow figure showing the flow of the whole processing performed by a bidding system. 2 is a block diagram showing a functional configuration of an automatic design device; FIG. It is an example of an interface for inputting land information related to a land utilization project. FIG. 2 is a conceptual diagram showing an architectural design obtained from an automatic design unit and a balance calculation unit, and an outline of various balance calculation results; It is a figure explaining an example of the method of calculating a sales standard price. FIG. 4 is a diagram showing the operation of bidding for a design obtained by an automatic design device in the bidding system; It is a figure which shows the functional structure of a construction cost bidding apparatus. 1 is an example of an interface for bidding on construction costs. It is a figure which shows the functional structure of a block bid apparatus. 1 is an example of an interface for bidding on parcels; 1 is an example of an interface for bidding on parcels; 14 is a diagram showing another example of the interface shown in FIG. 13; FIG. It is a figure which shows the functional structure of a propriety determination apparatus. FIG. 10 is a diagram showing an example of a flow in a determination device when a basic period and an extension period are set as bidding periods; FIG. 3 is a diagram schematically explaining determination of feasibility of a building plan when bidding is conducted on a plurality of designs for one land utilization project; 1 is a conceptual diagram showing the overall configuration of a building bidding system according to a reference example; FIG. FIG. 10 is a flowchart showing the overall flow of processing executed using the bidding system according to the reference example; It is a figure which shows the functional structure of the block bidding apparatus based on a reference example.

FIG. 1 is a conceptual diagram showing the overall configuration of a building bidding system 10 according to a preferred embodiment of the present invention.

The bidding system 10 includes a storage 100, an automatic design device 200, a building cost bidding device 300, a parcel bidding device 400, and a network N for inter-computer communication using a public telecommunication line such as the Internet. It is conceived as a mode in which the determination device 500, client terminal 600, builder terminal 700, and purchaser terminal 800 are connected.

The storage 100 is a device that commonly stores information used by the automatic design device 200, the building cost bidding device 300, the block bidding device 400, and the propriety determination device 500, and may be a general storage server. Also, the automatic design device 200, the building cost bidding device 300, the block bidding device 400, and the propriety determination device 500 may be constructed using a general server computer.

In FIG. 1, the storage 100, the automatic design device 200, the building cost bidding device 300, the block bidding device 400, and the propriety determination device 500 are assumed to be independent devices and to be connected to the network N independently. Although shown, this indicates that it is sufficient if each device is functionally configured as shown in FIG. 1, and does not limit the actual physical configuration of each device. For example, each device may be built virtually on a network server known as a cloud computing service, where a particular "device" as used herein is built distributed across multiple physical devices. Alternatively, multiple "apparatuses" may be built on the same physical device, and are not limited to the configuration, arrangement, and location of the actual device.

The owner terminal 600, the builder terminal 700, and the purchaser terminal 800 may be general PCs, and refer to terminals used by users who connect to and use the bidding system 10 via the network N. FIG. Therefore, the number of client terminals 600, builder terminals 700, and purchaser terminals 800 is not limited, and these terminals are not always connected to the bidding system 10. FIG. Also, the expressions of client terminal 600, builder terminal 700, and purchaser terminal 800 are in line with the form of use of the PC. That is, for example, regarding the client terminal 600, a PC used by a certain user when using the bidding system 10 as a client is referred to as a "client terminal". If the user uses the bidding system 10 as a "builder", then such a PC is thought of as a "builder terminal". Therefore, none of the client terminal 600, the builder terminal 700, and the purchaser terminal 800 need to be dedicated machines specialized for the use of these terminals.

The automatic design device 200, the construction cost bidding device 300, the block bidding device 400, the propriety determination device 500, the client terminal 600, the builder terminal 700, and the purchaser terminal 800 described above are physically general computers. It can be realized by using FIG. 2 is a configuration diagram showing a typical physical configuration of such a general computer 1. As shown in FIG.

A computer 1 includes a CPU (Central Processing Unit) 1a, a RAM (Random Access Memory) 1b, an external storage device 1c, a GC (Graphics Controller) 1d, an input device 1e and an I/O (Input/Output) 1f via a data bus 1g. They are connected so that they can exchange electrical signals with each other. Here, the external storage device 1c is a device capable of statically recording information, such as an HDD (Hard Disk Drive) or an SSD (Solid State Drive). A signal from the GC 1d is output to a monitor 1h, such as a CRT (Cathode Ray Tube) or a so-called flat panel display, on which a user visually recognizes an image, and displayed as an image. An input device 1e is a device such as a keyboard, a mouse, a touch panel, etc. for a user to input information, and an I/O 1f is an interface for the computer 1 to exchange information with external devices. Depending on the information processing load required by the computer 1, a plurality of CPUs 1a may be prepared to perform parallel operations.

An application program containing command strings for causing the computer 1 to function as each device described above is installed in the external storage device 1c, read out to the RAM 1b as necessary, and executed by the CPU 1a. Further, such a program may be provided by being recorded on an appropriate computer-readable information recording medium such as an appropriate optical disk, magneto-optical disk, flash memory, etc., or may be provided via an information communication line such as the Internet. In addition, the interface for the user to use each of the devices described above may be one in which an interface relating to the computer 1 itself is implemented and the user directly operates the computer 1, or a web interface on another computer. It may be a so-called cloud computing method in which general-purpose software such as a browser is used and functions are provided from the computer 1 via the I/O1f. interface), the computer 1 may operate as each of the devices described above in response to requests from other computers.

As an example of a method using API, among the devices constituting the bidding system 10, services provided to each user from the automatic design device 200, the building cost bidding device 300, the parcel bidding device 400, and the propriety determination device 500 A server serving as a window for one-stop provision may be additionally provided. When the service from the bidding system 10 is provided using a web service such as WWW, such a server becomes a so-called portal, and information communication with the terminal used by each user through the portal site provided by this server to each user. , and the portal server exchanges necessary information with the devices constituting the bidding system 10 using the API.

FIG. 3 is a flow diagram showing the overall flow of processing performed by the bidding system 10. As shown in FIG. An overview of the processing executed by the bidding system 10 and its technical and practical significance will be described below with reference to this figure.

In the bidding system 10, land information is first entered in step S1. This land information is input by the client using the client terminal 600 shown in FIG. The land here refers to land that is expected to be used in the future, such as idle land and land whose current use is expected to end. and intends to generate business revenue by selling the parcel. The input land information is stored in the storage 100 .

Here, the "client" is a management body such as an owner of the land, and a body that should be the business owner of the above-mentioned land utilization business. In addition, a "section" is an object to be bought and sold independently, and as a specific example, representatively, each unit in a collective housing corresponds to a "section". The use of each section is not limited to residential use, and may be office space, tenant space, meeting rooms, or any other purpose, but sales and purchases are made for each section, such as with the transfer of compartmentalized ownership. be. A “building” can be anything as long as it has multiple compartments. It may be a facility consisting of an assembly of buildings. "Land information" refers to general information about the land, but particularly includes sufficient information for designing a building to be built on the land, as will be described in the next step S2.

The purpose of the processing performed by the bidding system 10 is, in practice, to match the client, the builder and the purchaser in the land utilization business, and to increase the feasibility and profitability of the business. Therefore, technically, as will be described later, an information processing system is constructed in which bidding for building costs and bidding for parcels are performed in parallel while being mutually related.

In step S2, based on the land information input by the client, a building to be built on the land is automatically designed. Such automatic design is performed by the automatic design device 200 . The resulting design is also stored in the storage 100 in step S3.

In this embodiment, the building is designed by the automatic design device 200, but the design is not limited to this. You may let However, in the case of complex housing, office buildings, and tenant buildings that are highly standardized and repetitive, automatic design can greatly reduce the time and cost required for design, and as a result, the business can be realized. and profitability tend to be high. On the other hand, in the case of highly unique facilities such as amusement facilities, automatic design may not be adopted.

The bidding for the construction cost in step S4 and the bidding for the parcel in step S5 are made concurrently. The building cost bidding process is performed by the building cost bidding apparatus 300 by the builder accessing the bidding system 10 through the builder terminal 700 . A bid for a parcel is processed by the parcel bidding device 400, and the purchaser accesses the bidding system 10 through the purchaser terminal 800. FIG. It should be noted that the term "builder" here refers to a subject who actually intends to undertake the execution of building design, and includes those who were unable to make a successful bid as a result of bidding. "Purchaser" refers to an entity that intends to purchase a parcel, and likewise includes those who were unable to win a bid as a result of bidding, and whether it is an individual, a corporation or other organization. It doesn't matter.

Then, in step S6, whether or not the building plan can be executed is determined according to the results and/or conditions of the bidding for construction costs (step S4) and the bidding for the parcel (step S5). Such a decision is made by the decision device 500 . What the propriety determination device 500 does is to determine whether matching is established, that is, whether the above-described land utilization business is established, according to the result or status of the bidding for the building cost and the result or status of the bid for the parcel. determining, and may include selecting a building plan for a commercially profitable design.

That is, in the bidding system 10 according to the present embodiment, bidding for construction costs and bidding for parcels are conducted in parallel, and whether or not the building plan can be executed is determined according to the results or circumstances of each bidding. It increases the feasibility and profitability of the utilization business, and thus rationally establishes the construction project as a business. Hereinafter, each flow will be described in more detail according to the embodiment.

FIG. 4 is a block diagram showing the functional configuration of the automatic design device 200. As shown in FIG. In this embodiment, the automatic design device 200 is responsible for executing steps S1 (land information input) and step S2 (automatic building design) in the flow of FIG. related to

The land information input unit 201 provides a client who accesses the bidding system 10 through the client terminal 600 with an interface for inputting land information related to a land utilization project. FIG. 5 shows an example of such an interface, which is displayed on the screen of a client terminal 600 used by a client who accesses the bidding system 10, here the automatic design device 200, to prompt the input of necessary items. there is

The land information includes the location and rights of the relevant land, and the information necessary to determine the land utilization project for the relevant land. The interface shown in FIG. 5 prompts the user to enter "site information" corresponding to the location of the land. The "site information" includes the address and area of the land. Alternatively, as shown in FIG. 5, a "select from map" button control may be provided, and the "site information" may be automatically input by designating the corresponding location on the map displayed on the screen.

In addition, the same interface prompts the user to input "right type" and "right holder information" as those corresponding to the right relationship. "Right type" specifies the type of land right to be used. can be entered. "Right holder information" is information about the right subject specified in the "right type". Specifically, for ownership, it is information that can identify the owner, and for lending, it is information that can identify the lender. person information." It should be noted that the right holder (proprietor, etc.) here may or may not be the same as the client. For example, it is conceivable that a third party entrusted with the implementation of a land utilization project by a right holder will become the client.

Furthermore, the same interface prompts the user to input "use of use" and "target profit rate" as information necessary for determining the land utilization business for the land. "Utilization purpose" designates for what purpose buildings are to be constructed on the land to be utilized and to plan its utilization. It is possible to select or input a classification such as whether to construct and sell tenant buildings, office buildings, and other facilities. Furthermore, information other than "use of use" may be input as necessary information for determining the land utilization project for the land. As such information, design types of buildings, such as designation of design concepts such as Japanese style/Western style, modern/classic, etc., can be considered. The "target profit rate" specifies the profit rate in the business profit targeted by the land utilization business itself.

In this embodiment, the interface for inputting land information is provided to the owner by the automatic design device 200, but it is not limited to this. Another server that provides an input interface for land information may be used, or an application program may be installed in client terminal 600 itself, and the interface may be provided by the application program. The input land information may be sent directly to the automatic design device 200 , or may be temporarily stored in the storage 100 and the automatic design device 200 may refer to the land information stored in the storage 100 .

Returning to FIG. 4, the input land information is transferred to the automatic design unit 202, and a building to be built on the land is automatically designed. Based on the location of the land, the automatic design unit 202 refers to the map/topography information DB 204, acquires the detailed land shape such as the planar shape and height difference of the land, and determines the building to be built on the land. design. At this time, with reference to the legal/regulatory information DB 205, the legal and administrative regulations for construction on the land, for example, the classification of use areas such as residential areas, commercial areas, and industrial areas, building coverage ratio, floor area ratio, and height Land utilization project specified by the owner by referring to the design data template DB 206 according to the information necessary to determine the land utilization project for the land, using restrictions, north slope restrictions, greening ratio, etc. as restrictions on the design. Build a building structure that conforms to For example, if construction and sales of housing complexes are designated as a land utilization business, appropriate templates for housing complexes prepared in the design data template DB 206 are combined to ensure structural strength, The architectural design of a building is carried out by piling up floors and arranging the necessary spaces so as to comply with laws and regulations. At this time, the real estate information DB 207 is referred to, and a template is selected so as to optimize the possibility of sale and sales profit from the demand and market price of real estate in the neighborhood. For example, if there is strong demand for properties for singles in the vicinity of the land in question and the market price is high, then a template for lots for singles will be preferentially used, and if demand for properties for families is strong, a template for lots for families. are preferentially used. Various algorithms including those using machine learning can be used for the automatic design algorithm performed by the automatic design unit 202. In any case, a known algorithm may be used, and a detailed description thereof will be omitted. . The architectural design referred to here may include structural design, architectural design, and equipment design, and may also include construction methods and process plans for construction.

The obtained architectural design is transferred to the balance calculation unit 203, and the balance including various cost calculations as a building project is calculated. At this time, the material master 208 is referred to for price information of building materials, etc., and the construction cost master 209 is referred to for price information of construction costs related to construction. Further, from the management cost master 210, price information of management costs such as office costs under construction, clerical costs such as applications to various authorities, and various sales and administrative costs such as advertising costs are referred to.

FIG. 6 is a conceptual diagram showing the architectural design obtained from the automatic design unit 202 and the balance calculation unit 203, and an outline of various balance calculation results. The diagram includes 3D models such as BIM (Building Information Modeling) of buildings placed on the land, design drawings of buildings and other structures, process plans of construction work schedules, lists of materials and equipment, Based on the strength calculation, income and expenditure plan and other financial documents, and the construction cost estimated by the income and expenditure calculation unit 203 (hereinafter referred to as “initial construction cost”), the target profit rate input by the client is realized. , which is the selling price of each section included in the building according to the architectural design set in . Henceforth, in this specification, these architectural designs, process plans, and various financial documents including income and expenditure calculations are referred to as "designs."

Note that the sales standard price may be calculated by the method shown in FIG. 7 as an example. The stacked vertical bar graph on the left side of FIG. 7 shows business costs, which are roughly the sum of land prices, construction costs, management costs, and profits. Here, the land price is the price of the part of the value of the land related to the land utilization business that is used for the business. , and when establishing leasehold rights and superficies, it is the appraisal value of each corresponding right. The construction cost is the initial construction cost already explained above, and the management cost includes selling, general and administrative expenses and the like. The profit is calculated as an amount corresponding to the target profit rate entered by the owner as a percentage of the total cost of the business. For example, if the target profit rate is 15%, the land price, construction cost and management cost will account for 85% of the total business cost, and the remaining 15% will be the profit.

The bar graph on the right shows the total selling price, ie the sum of the base selling prices of all parcels. Here, the total selling price is set to cover the cost of the business if the total number of parcels sold reaches the target sales rate for the total number of parcels. In the example shown in FIG. 7, the target sales rate is set to 80%. Therefore, if 80% of sales contracts are concluded among all the plots, the business cost can be recovered and the desired profit can be obtained. This land utilization business will be established as a business.

A base selling price for each parcel is obtained by apportioning the total selling price thus obtained to each parcel. This sale does not necessarily allocate the total selling price evenly to each parcel, but may be graded according to the value of each parcel. For example, a block with a larger area has a higher value, a block with a higher level has a higher value, a block with a better view and lighting has a higher value, and the like.

The design obtained as described above is stored in the storage 100 so as to be accessible from the building cost bidding device 300, the parcel bidding device 400 and the propriety determination device 500 (step S3 in FIG. 3).

Returning to FIG. 4 , the balance calculator 203 of the automatic design device 200 further includes a recalculator 211 . The recalculation unit 211 uses a part of the functions of the balance calculation unit 203, and recalculates the standard sales price of each section when the construction cost in the design is revised from the initial construction cost. be. The operation of the recalculator 211 in the bidding system 10 will be described later.

In the example shown in FIG. 4, the map/topography information DB 204, the law/regulation information DB 205, the design data template DB 206, the real estate information DB 207, the material master 208, the construction cost master 209, and the management cost master 210 are stored in the automatic design device 200. Although shown as being included, all or part of these may be stored in an external server such as the storage 100 and accessed from the automatic design device 200 as appropriate. In addition, since the function of the recalculation unit 211 overlaps with a part of the balance calculation unit 203, it is rational to provide it in the automatic design device 200, but the configuration is not necessarily limited to this. , for example, one of the building cost bidding device 300, the parcel bidding device 400, and the propriety determination device 500, or any other server.

FIG. 8 is a diagram showing the operation of bidding for a design obtained by the automatic design device 200 in the bidding system 10. As shown in FIG. In the figure, only the balance calculator 203 and the recalculator 211 are shown in the configuration of the automatic design device 200 . In addition, in the figure, the automatic design device 200, the construction cost bidding device 300, the block bidding device 400, and the propriety determination device 500 are depicted as communicating directly with each other. It may be an indirect one through the intermediary (of course, direct exchange is also acceptable). This figure conceptually shows the relationship between each device in order to explain the flow of operation.

First, the design obtained by the automatic design device 200 and including the initial construction cost and the standard sales price is referred to by the construction cost bidding device 300 and the section bidding device 400, and the construction cost bidding and the bidding for each section are conducted, respectively. will be These two types of bidding are conducted in parallel.

The design includes the initial construction cost calculated by the automatic design device 200, but the actual construction cost incurred in actually carrying out the land utilization project is determined by the contractor who won the construction of the project. This is the bid price presented and is expected to differ from the initial construction cost. Therefore, the building cost for a design actually fluctuates depending on the bidding status of the building cost.

Similarly, the design includes the base selling price calculated by the automatic design device 200, but in actually carrying out the land utilization business, the actual selling price obtained by selling the parcels is the same. It is the successful bid price presented by the buyer who won the bid for the parcel, and is expected to differ from the sales standard price. Therefore, the selling price for each parcel also actually fluctuates depending on the bidding status of each parcel.

Not only that, but in the process of bidding in the building cost bidding device 300, if a bid is made that offers a lower building cost, the building cost in the project costs shown in FIG. 7 will be lower than the initial building cost. This means that the business cost itself will be reduced. In that case, the total selling price of the section calculated from the business cost, and by extension the standard selling price of each unit itself will be lower. That is, as the bidding progresses, a lower sales reference price can be presented by a purchaser who intends to bid on the block bidding device 400, so that the purchaser is urged to bid and a sales contract for the block can be concluded more easily. In other words, the possibility of rational establishment of this land utilization business increases.

Therefore, the building cost bidding device 300 notifies the recalculation unit 211 of the building cost for which a bid was actually made as the estimated building cost according to the bidding status. The recalculation unit recalculates the sales base price using the notified estimated construction cost in place of the initial construction cost obtained at the time of design, and notifies the parcel bidding device 400 of it. The parcel bidding device 400 continues the bidding while presenting the buyer with the notified updated selling price.

The bidding progress is monitored by the feasibility determination device 500, and feasibility of execution of the building plan for the land utilization project is determined at any time based on predetermined conditions. The details of the conditions will be described later, but usually the land utilization business is rationally established. You may judge that the business is established.

FIG. 9 is a diagram showing the functional configuration of the construction cost bidding device 300. As shown in FIG. In step S4 of FIG. 3, the construction cost bidding device 300 provides a construction cost bidding environment for construction work in land utilization projects to builders who access the bidding system 10 via the builders terminal 700. is based on the design of a building having multiple lots that are independently marketable and allows builders to bid over at least the cost of building said building through telecommunications lines.

The construction cost bidding device 300 has a design reception unit 301, a bid reception unit 302, and a bid management unit 303. The bid management unit 303 is further provided with a bid evaluation unit 304 and a bid status notification unit 305. . The design reception unit 301 registers the design in the bid management unit 303 when the design is made by the automatic design device 200 . Specifically, the design reception unit 301 may periodically monitor the storage 100 and register a new design when it is newly registered, or may indicate that a new design has been made by the automatic design device 200 . may be received and registered. Note that registration here does not necessarily mean that a copy of the design data itself is stored in the bid management unit 303 . The bid management unit 303 only needs to know that there is a design to manage bids, and may access the storage 100 and acquire necessary information each time. The same applies to the bid status, which will be described later. The information itself indicating the bid status may be stored in the storage 100 and accessed by the bid management section 303 as needed, or the bid management section 303 itself may check the bid status. The information shown may be stored and managed.

The bid receiving unit 302 provides an interface for bidding for a design whose bids are managed by the bid management unit 303 to builders accessing the bidding system 10 via the builders terminal 700 . Necessary information regarding the bid is provided by the bid management section 303 , and the received bid is transferred to the bid evaluation section 304 .

The bid management unit 303 manages bids for construction costs for designs made by the automatic design device 200 . The number of designs managed by the bid management unit 303 is not necessarily limited to one, and bids for a plurality of designs may be made concurrently. FIG. 9 schematically shows how three designs, design 1, design 2, and design 3, are managed by the bid management unit 303. In FIG.

Each design is linked and managed with the latest bidding status for each design. Here, the bidding status may include information on the bidding period, information on the bidders, and information on the evaluation of each bid.

The bidding period is generally managed by the start date and time of the bidding and the end date and time of bidding, and the bidding reception unit 302 receives the bidding during the bidding period. In addition, more complicated period management, for example, a basic period and an extended period are provided, and during the basic period, bids are accepted regardless of whether the acceptability determination device 500, which will be described later, determines whether the bid is acceptable or not, and after that, the extended period. Bids may be accepted until the feasibility determination device 500 determines that the building plan can be executed. In other words, if the construction plan is determined to be feasible during the basic period, the bidding ends at the end of the basic period. , the bidding period may be changed according to the bidding situation, for example, it is possible to wait for further bidding with an extension period as the upper limit.

The information about the bidders is the builder who submitted the bid and the contents of the bid. The contents of the bid include the bid amount for the construction cost.

The evaluation of each bid is based on predetermined criteria, such as assigning a numerical value (score) to the superiority or inferiority of each bid. The simplest evaluation, which favors the lowest bid, is performed by the bid evaluation unit 304 .

The bid accepting unit 302 accepts bids from builders during the bidding period. The bid reception unit publishes necessary information on the design registered in the bid management unit 303 on the network N so that construction contractors who access the bidding system 10 can view the information. The builder refers to the construction design, various calculation sheets, schedules, etc., and the initial construction cost for one or more designs, and bids for the construction cost that can be constructed based on their own judgment.

FIG. 10 is an example of an interface for a construction cost bid displayed on the screen of the builder terminal 700 by the bid receiving unit 302 . A builder accessing the bidding system 10 can select the design currently being bid on from the project selection and obtain the necessary information for that design. In the example of FIG. 10, when design is selected, the project type, that is, the type of building to be built, such as an apartment complex or a tenant building, an overview of the bidding period and its location, and the initial construction cost (on the same interface, , shown as "reference building price") is displayed, and everything necessary to calculate the construction cost, such as 3D models (BIM models), design drawings, various calculation sheets and schedules included in the design A button control is provided so that the information can be downloaded and viewed. In the same interface, by selecting a map reference button control provided in the location column, for example, an external map information service or the like can be called through the network N and the location can be confirmed on the map. there is

The builder performs each review based on the required information, and if he or she believes that the design may be accepted for construction, enters the required information into the interface and selects the button control labeled BID. By doing so, you can bid. In this example, the construction company is provided with a column for entering a VE (Value Engineering) proposal at the time of bidding, in addition to its name and bid price. Also, if materials such as electronic files required for the VE proposal are required, they can be attached at the time of bidding.

Returning to FIG. 9, the accepted bid is passed to the bid evaluation unit 304, and the bid is evaluated. The simplest bid evaluation is based on the bid price, but other evaluation criteria may be introduced to ensure the certainty and quality of construction work. For example, the amount of reduction (or reduction rate) from the initial construction cost of the bid amount is weighted as 60%, the past performance and trust of the contractor as 20%, and the added value such as whether or not there is a VE proposal as 20%. A score may be generated based on the bid, and the score may be used as an evaluation for that bid.

The bid status notification unit 305 notifies the automatic design device 200 and the acceptability determination device 500 of the bid status of each design. For the automatic design device 200, the recalculation unit 211 is notified of the bid price of the bid with the highest evaluation in the bidding status for one design. As a result, as shown in FIG. 8, the recalculation unit 211 recalculates the sales reference price for the design, and notifies the parcel bidding device 400 of it. In other words, at a certain point in time, the construction price of the bid with the highest evaluation is expected to be the actual construction cost incurred in actually carrying out the land utilization project, unless a bid with a higher evaluation is made. This is because the standard sales price should be calculated based on the construction price. The notification from the bid status notification unit 305 to the automatic design device 200 may be performed periodically, but if it is performed when the bid with the highest evaluation is updated, there will be a time lag from the bid to the revision of the sales standard price. Short and preferred.

On the other hand, the approval/disapproval determination device 500 may be notified when necessary. For example, a bid period may elapse, and at the end of the bidding period, the bid price for the highest rated bid may be announced. In addition, as described above, when the bidding period consists of a basic period and an extended period, no particular notification is made during the basic period, the bid price is notified at the end of the basic period, and the highest bid price is displayed during the extended period. The bid price should be notified each time the bid with the highest value is updated.

Alternatively, the bid price may be announced each time the highest rated bid is updated, regardless of whether the bidding period (or underlying authority) has elapsed. In this case, the proprietor can also check the progress of the propriety judgment of the business in the propriety judging device 500 .

FIG. 11 is a diagram showing the functional configuration of the parcel bidding device 400. As shown in FIG. The parcel bidding device 400 provides a bidding environment for the sale of parcels in the land utilization business in step S5 of FIG. It is intended to make bidders who wish to purchase bids.

The block bidding device 400 has a design reception unit 401, a bid reception unit 402, a bid management unit 403, and a recalculation reception unit 406. The bid management unit 403 is further provided with a bid status notification unit 405. . The design reception unit 401 registers the design in the bid management unit 403 when the design is made by the automatic design device 200 . As with the design reception unit 301 of the construction cost bidding apparatus 300 described above, the design reception unit 301 may periodically monitor the storage 100 and register new designs when they are registered. , a notification to the effect that a new design has been made may be received from the automatic design device 200 and registered. Moreover, as already described with respect to the construction cost bidding device 300, registration does not necessarily mean that a copy of the design data itself is stored in the bid management unit 403. FIG.

The bid receiving unit 402 provides an interface for bidding for a design whose bid is managed by the bid management unit 403 to a purchaser who accesses the bidding system 10 via the purchaser terminal 800 . Information necessary for bidding is provided by the bidding management unit 403, and the received bidding is reflected in the bidding status.

The bid management unit 403 manages bids for each section of the building included in the design made by the automatic design device 200 . The number of designs managed by the bid management unit 403 is not necessarily limited to one, and bids for a plurality of designs may be made concurrently. FIG. 11 schematically shows how three designs, design 1, design 2, and design 3, are managed by the bid management unit 403, similar to FIG.

Again, each design is linked to and managed with the latest bidding status for each design. Here, the bidding status may include bidding period information, bidder information, and bidding price information.

The bidding period may normally be the same as the bidding period for construction costs set in the construction cost bidding device 300, but may be longer. This is because, unlike bidding for construction costs, parcel bidding may continue to have unbidden parcels even when the feasibility determination device 500 determines that the building plan can be executed. In such a case, a bidding period may be set for each block. is determined to be feasible, it is possible that the tender is not actually conducted, and that the bid is made at the presented sales reference price (or higher) as a successful bid.

The information about bidders includes information specifying the purchaser who has made a bid and the bid price.

The bid accepting unit 402 accepts bids from purchasers during the bidding period. The bid receiving unit publishes necessary information such as building information and section information about the design registered in the bid management unit 403 on the network N so that purchasers who access the bidding system 10 can view the information. to The purchaser refers to the building information and the information of each lot for one or more designs, and bids for the lot that he/she wishes to purchase.

12 and 13 show an example of an interface for a parcel bid displayed on the screen of the purchaser terminal 800 by the bid reception unit 402. FIG. The purchaser terminal 800 of a purchaser who has accessed the bidding system 10 displays an interface as shown in FIG. It is possible to obtain the information necessary to decide whether to purchase the parcel or not. In the example of FIG. 12, when design is selected from project selection, the type of building for that design is displayed on the interface. and its location, information about the surrounding environment, and other information that a buyer might consider in deciding whether to purchase a lot. In the same interface, by selecting a map reference button control provided in the location column, for example, an external map information service or the like can be called through the network N and the location can be confirmed on the map. there is

In addition, a conceptual drawing of the building according to the selected design may be displayed on the interface, making it easier for the purchaser to grasp the completed image of the building when considering purchase. In addition, such a conceptual drawing may be displayed as 3D graphics based on the BIM model etc. included in the design, and the purchaser can freely change the viewpoint on the interface, making it easier to consider in more detail. there is

If the purchaser is interested in the building of the selected design and wishes to purchase it, he or she selects the "Plot Bid" button control on the interface of FIG. Then, the interface shown in FIG. 13 is displayed, and the detailed information of each parcel related to the bid can be checked, and the bid can be participated. That is, in the parcel bidding device 400, the purchase of each parcel by the purchaser is by bidding, and for each parcel, the bid of the highest amount among the valid bids made within the bidding period is You can win a bid and buy the parcel.

The interface in FIG. 13 shows each parcel related to the bid in the form of a tile display so that the purchaser can view at a glance. , and the current bid price (i.e., the highest bid available). Bid prices in the figure are shown in units of 10,000 yen. Also, in the interface shown in the figure, button controls for "floor plan", "VR" and "bid" are provided on the tiles representing each section.

When the "Floor plan" button control is selected, a floor plan showing the floor plan of each section is displayed, and the specific size of each section and the layout of each room, equipment, etc. can be confirmed. Also, when the "VR" button control is selected, 3D graphics can be used to realistically confirm the state of the interior of the section after the building is completed. Note that FIG. 13 shows an example of information displayed on each tile, and not all of them are necessarily displayed, and information other than what is shown here is shown. may

The purchaser, having reviewed and reviewed the parcel, selects the "Bid" button control if they wish to purchase the parcel. In that case, an interface for inputting information necessary for bidding is displayed (not shown), and the bid price and information about the purchaser, such as name, address, location, contact information, etc., are input. In addition, in order to ensure the certainty of bidding, payment of a predetermined contract advance payment may be requested at the time of bidding. The contract advance payment may be of a nature that is appropriated as part of the purchase price at the time of the sales contract after the successful bid, and may be refunded if the contract fails, such as when the successful bid is unsuccessful.

Purchasers will take into consideration the current price of a parcel when considering purchase, but for parcels that have not yet received bids, the sale price for that parcel will be displayed as the current price. In other words, the parcel bidding device 400 presents the purchaser with the sales reference price as the initial current price of each parcel. At the time of bidding, the purchaser bids the purchase price of the section he wishes to purchase. Therefore, in order to win the bid, it is necessary to bid an amount exceeding the current price of the section. Therefore, in this example, the sales base price is the minimum selling price of the parcel, and the parcel bidding device 400 allows prospective purchasers to bid for the purchase price of the parcel.

In the above example, the interface shown in FIG. 12 and the interface shown in FIG. 13 are shown as separate interfaces. , and the required information may be separated into any number of interfaces.

14 is a diagram showing another example of the interface shown in FIG. 13. FIG. In the interface of FIG. 14, the base selling price and the premium price are shown for the tiles representing each parcel, instead of the maximum purchase price of the parcel under bidding. Here, the standard selling price is equal to the standard selling price and indicates the minimum selling price of the parcel. The premium price is an amount added to the standard selling price, and the purchase amount required for the purchase of the section by the purchaser is the sum of the standard selling price and the premium price.

In the interface of FIG. 14, the premium price is presented as the bid amount by the purchaser who selects the "Bid" button control. That is, the purchaser bids how much the purchase price can be added to the standard selling price.

13 interface and FIG. 14 interface, if the standard selling price remains the same as it was designed, this is simply a difference in how information is presented to the purchaser. There is no essential difference in terms of technology or convenience in using the bidding system 10 . However, as shown in FIG. 8, the recalculation unit 211 recalculates and revises the standard sales price according to the bidding status of construction costs. The recalculated sales reference price is received by the division bidding device 400 by the recalculation receiving unit 406 shown in FIG. 11 and transferred to the bid receiving unit 402 .

The prices shown in the interfaces shown in FIGS. 13 and 14 are changed in accordance with the revision of the sales standard price. That is, in the section bidding device 400, the sales reference price is varied according to the bid amount in the building cost bidding device 300 for the construction cost of the building related to the design.

Specifically, in the interface of FIG. 13, if the current price shown for parcel 1501: 12,000 is from a bid, then this is the valuation the buyer has accepted for that parcel. , while the current price shown in block 1502: 11,000 is the unbidded sales base price, and the recalculation changes this price to 10,500, the current price will be the sales price for the recalculation. It is revised to 10,500, which is the base price. In this way, by recalculating the sales reference price for the unbidden parcels, bids for the unbidden parcels are promoted, and the propriety determination device 500, which will be described later, determines that the building plan can be executed. more likely to be judged.

On the other hand, in the interface of FIG. 14, the standard selling price is indicated for all parcels, and the amount required by the purchaser to purchase the parcel is the sum of the standard selling price and the premium price. In this case, since the standard selling price indicates the standard selling price, if the standard selling price changes due to recalculation, the displayed standard selling price will also change accordingly. Therefore, in this case, as in the example of FIG. 13, bids for unbidded parcels are promoted, and at the same time, the purchase price of parcels for which bids have already been made changes according to the bidding status of construction costs. , i.e., the price will drop, so that the sense of unfairness between buyers who bid early in the bidding period and those who bid near the end of the bidding period can be eliminated, e.g. It is possible to prevent a situation in which the bidding period is not substantially secured due to the concentration of bidding.

FIG. 15 is a diagram showing a functional configuration of the permission determination device 500. As shown in FIG. The feasibility determination device 500 determines whether or not the land utilization project, that is, the construction plan can be executed in step S6 of FIG. , and based on both the bid status and the bid amount for a plurality of lots in the bidding in the lot bidding device 400, it is determined whether or not the construction plan of the building can be executed.

The feasibility determination device 500 has a design reception unit 501 , a bidding status reception unit 507 , a feasibility determination unit 508 , and a result transmission unit 510 . The design reception unit 501 receives the design obtained by the automatic design device 200 from the storage 100 and registers it in the availability determination unit 508 . Note that registration does not necessarily mean that a copy of the design data itself is stored in the bid management unit 403, as in the construction cost bidding device 300 and the block bidding device 400 described above. Even if a copy of the design data is stored and managed in the feasibility determination unit 508, it is not necessary to store all the design data in the feasibility determination unit 508. Just Specifically, it suffices if a statement related to income and expenditure calculation is included, and the part related to architectural design and process planning is not necessarily required.

The bidding status reception unit 507 receives the bidding status of the building cost in the building cost bidding device 300 and the bidding status of the building cost in the parcel bidding device 400 at any time, links them to the corresponding design in the propriety determination part 508, and registers them. The bidding status reception unit 507 may receive the bidding status notification directly from the construction cost bidding device 300 and the parcel bidding device 400, or may indirectly receive the bidding status via the storage 100. good too. In the case of using the storage 100, the storage 100 may be accessed periodically, such as every hour, to check whether the stored bid status has been updated. The notification may be received from the building cost bidding device 300 and the parcel bidding device 400 to access the storage 100, or both.

The judging device 509 refers to the bidding status of each design registered in the feasibility judging unit 508 and judges whether or not the building plan for the design is feasible. Here, the feasibility of a building plan refers to a state in which the expected total sales price of a plurality of sections of the building pertaining to the design exceeds the business cost at the time of judging feasibility. In other words, whether or not a building plan can be executed is determined by comparing the bid amount for the construction cost of the building plus the profit required for the predetermined fixed cost, and the sum of the bid amounts for multiple plots. determined by

The project cost is as already explained with reference to Figure 7, and is the sum of land price, construction cost, management cost and profit. Since the building cost is the bid price of the bid with the highest evaluation in the building cost bidding apparatus 300, it may change each time the bidding status is updated. In the present embodiment, the profit is also set as a percentage of the business cost, so the amount will fluctuate if the construction cost fluctuates. The amount of profit may be set as an absolute amount instead of a percentage, or may be treated as fixed at the initial design amount and not fluctuating.

The expected total sales price is the total expected sales price of the parcels applied for by the purchasers at the time of determination of acceptance. That is, the sum of the highest (ie, most likely to be won) bids for the parcels on which bids are placed in parcel bidding apparatus 400 is the expected total selling price. Therefore, since the expected total sales price guarantees the actual sales that can be obtained when the land utilization business is executed, the target profit will be obtained when the expected total sales price exceeds the business cost.

The determination by the determiner 509 is made as needed, but the timing of the determination may be adjusted according to the set bidding period. FIG. 16 is a diagram showing an example of the flow in the determiner 509 when the basic period and the extended period are set as the bidding period. Note that the flow shown in FIG. 16 is a judgment flow for one design, so if a plurality of designs are registered in the propriety judging unit 508, the processing shown in FIG. 16 is performed for each design. It will be.

The determiner 509 first executes steps S11 to S13 during the basic period of the bidding period. During this basic period, in principle, since new bids are awaited, the decision unit 509 does not decide whether or not the building plan is feasible, but suspends the decision.

In step S11, the determiner 509 determines whether or not the basic period has passed. If the basic period has passed, the process immediately proceeds to step S14 to move to the processing for the extended period. If not, that is, if the basic period has not passed, the process proceeds to step S12 to determine whether the bidding status in the building cost bidding device 300 or the parcel bidding device 400 is updated. If there is no update of the bid status, there is nothing to be done, and the process returns to step S11 to wait for the lapse of the basic period or the update of the bid status. If there is an update of the bidding status, the process proceeds to step S13 to recalculate the business cost and the expected gross selling price.

At this time, the propriety determination device 500 may notify the result of the recalculation in step S13 in response to requests from the client, the builder, and the purchaser. Namely, the client, the builder, and the purchaser access the bidding system 10 through the client terminal 600, the builder terminal 700, and the purchaser terminal 800, respectively, and determine how much the expected total selling price at the time of access is relative to the necessary business costs. It would be nice to be able to view whether the degree is sufficient. By doing so, the client, the builder, and the purchaser can grasp the degree of possibility that the building plan will be executed. In other words, more active bidding can be expected for construction plans with high feasibility, and for construction plans with low feasibility, the client is asked to set profit and , is expected to serve as an opportunity to review the bidding period. For the purchaser, instead of the absolute amount of the business cost and the expected total selling price, the satisfaction rate of the expected total selling price with respect to the business cost may be indicated.

If the basic period has passed, it is determined that the basic period has passed in step S11, and the process proceeds to step S14. Steps S14 to S21 are processing during the extension period, and the processing during this period is, in principle, to wait for a bid until it is determined that the building plan is feasible within the extension period.

In step S14, it is determined whether or not the construction plan has already become viable through bidding during the basic period, ie, whether the expected total sales price exceeds the project cost. If it exceeds, there is no need to wait for the expiration of the extension period, and it is immediately determined in step S15 that the building plan can be executed, and the processing of the determination device 509 ends.

Depending on the bidding during the basic period, if the building plan is not executable, a negative determination is made in step S14, so the process proceeds to step S16, and the determining unit 509 determines that the extension period has passed. determine whether or not there is Here, the extension period has passed, meaning that all the bidding periods set have passed without the building plan becoming viable, and there are not enough bids to reasonably carry out the building plan. , indicates that the matching between the owner, the builder who is the builder, and the purchaser was unsuccessful. Therefore, in this case, the process proceeds to step S17, it is determined that the architectural plan cannot be executed, and the processing of the determination device 509 ends.

On the other hand, if it is determined in step S16 that the extension period has not elapsed, the process proceeds to step S18 to determine whether the bidding status of the building cost bidding device 300 or the parcel bidding device 400 has been updated. If there is no update of the bidding status, there is nothing to be done, and the process returns to step S16 to wait for the elapse of the extension period or the update of the bidding status. If there is an update of the bidding status, the process proceeds to step S19 to recalculate the business cost and the expected gross selling price.

If there is a recalculation of the business cost and the expected gross selling price due to the update of the bidding status, the process proceeds to step S20, and such update makes the construction plan feasible, i.e., the expected gross selling price exceeds the business cost. Determine whether or not If it exceeds, the process immediately proceeds to step S21, determines that the building plan is executable, and terminates the processing of the determination device 509. FIG. On the other hand, if the architectural plan is still not feasible even after such updating, the process returns to step S16 and similarly waits for the elapse of the extension period or the update of the bidding status.

Returning to FIG. 15, the result of determination by the determiner 509 is transmitted by the result transmission unit 510 to the necessary target. Specifically, the proprietor terminal 600 is notified of whether or not the construction plan can be executed, and the construction contractor terminal 700 and the purchaser terminal 800 of the builder and purchaser who participated in the bidding are notified of whether or not the construction plan can be executed. In other words, it notifies the success or failure of the building project related to the design.

In addition, when it is determined that the building plan can be executed, the bidder is also notified of the success or failure of the successful bid. The successful bidder is notified of the fact that the successful bid has been made and of the conclusion of the contract (construction consignment contract for the builder, sales contract for the purchaser) and information on the necessary procedures. In addition, if necessary, in order to smoothly proceed with the land utilization project, such as financial institutions such as banks, judicial scriveners, administrative scriveners, etc. You may send the necessary information.

The result transmitting unit 510 also notifies the building cost bidding device 300 and the parcel bidding device 400 whether or not the building plan can be executed. Regardless of whether the notice of approval or disapproval is given, if the construction cost bidding device 300 and the parcel bidding device 400 have closed the bidding and received bids for the extension period, the construction company and the purchaser will be notified of the extension period. You can announce the end. Even after the end of the bidding period, if there are unbidden parcels remaining, the parcel bidding device 400 may continue bidding for the parcels.

Moreover, the notification from the result transmitting unit 510 to the client terminal 600, the builder terminal 700 and the purchaser terminal 800 is not necessarily performed directly, but via the automatic design device 200, the building cost bidding device 300 and the parcel bidding device 400 respectively. You may make it In particular, when notification destinations for bidders are not managed by the propriety determination device 500 but are managed by the building cost bidding device 300 and the parcel bidding device 400 respectively, Notification to bidders should be provided.

As already described, the flow shown in FIG. 16 is an example of the flow in the determination device 509, and other flows may be adopted. As such a flow, for example, there is a flow in which only the basic period is set as the bidding period and no extension period is provided, and a bidding period is started when the conditions for judging that the construction plan can be executed are met without waiting for the elapse of the basic period. (provides only an extended period without providing a basic period), or may be another flow.

As a further modification, in the bidding system 10, a plurality of designs may be made from the automatic design device 200 for one land utilization project, and a bid may be made for each design. Other points, that is, the matters already explained with reference to FIGS. 1 to 15 may be the same in this modified example, so the explanations already given for these matters shall be used.

The bidding system 10 according to this modified example uses the system configuration shown in FIG. 1 and performs the processing according to the flow shown in FIG. 3, which is the same as that described above. Then, in the automatic design by the automatic design device 200 in step S2 of FIG. 3, a plurality of designs are output for one land utilization project, and in step S3 of the same figure, the plurality of designs are stored in the storage 100. It is supposed to That is, a plurality of designs are made for the same land information input by the land information input unit 201 shown in FIG.

The intention is to decide, through bidding, finally one design to be adopted in the land use project from among a plurality of mutually different designs. In other words, among different designs, if the construction is highly difficult and involves difficulties, there will be no tender for the construction cost, or even if there is, the construction cost will not go down much, and it is expected that the project cost will not be able to be reduced much. On the other hand, a design without support from consumers will receive few bids for the block, and it will be difficult for the feasibility determination device 500 to determine that the building plan can be executed. Therefore, the architectural design and its demand are matched, and the design that is expected to be more profitable is expected to be a good design from the point of view of land utilization. This is often difficult in practice.

Therefore, in the bidding system 10 according to this modified example, the automatic design device 200 makes a plurality of different designs. Specifically, if the building is a collective housing, the purchase target is the difference in the sales price range of each section, such as whether it is for the wealthy class or the popular class, and whether it is for singles. Examples of designs that differ in terms of target demographics, such as family-friendly, or modern or classic design.

Then, for a plurality of designs made by the automatic design device 200, bidding for construction costs and bidding for parcels are performed in parallel in steps S4 and S5 of FIG. Then, in step S6, it is determined whether or not the building plan can be executed. That is, the construction cost bidding device 300 causes the builders to bid on at least the construction cost of the building for each of the plurality of prepared designs, and the parcel bidding device 400 also causes the parcel bidding device 400 to bid for each of the plurality of prepared designs. For each of the above, the sales reference price is presented and the prospective purchaser is made to bid.

However, multiple designs made for the same land information conflict with each other. That is, since these multiple designs cannot be realized at the same time, the feasibility determination device 500 must exclusively determine that only one design can be executed from among these multiple designs.

FIG. 17 is a diagram schematically explaining this determination. Here, multiple designs made for the same land information are referred to as a "design group". The number N is assigned to each design group N, and the M-th design belonging to a particular design group N is designated as design MN. FIG. 17 shows a situation in which three designs 1-1, 1-2 and 1-3 belonging to design group 1 are made.

The building cost bidding device 300 and the parcel bidding device 400 bid for the building cost and parcels for designs 1-1, 1-2 and 1-3, respectively. As a result, each of the designs 1-1, 1-2 and 1-3 is associated with a bid status including a building cost bid status and a parcel bid status.

The feasibility determination device 500 determines feasibility of execution of the building plan for each of the plurality of designs 1-1, 1-2 and 1-3. This determination may be the one shown in FIG. 16 or the like. However, the feasibility determination device 500 must select one design 1-X from among these designs 1-1, 1-2 and 1-3, except when it is determined that none of the designs is feasible for the building plan. must.

The method of selecting one design 1-X is not necessarily limited, but as an example, at the end of the bidding period, the most profitable design among the designs that satisfy the conditions for the construction plan to be judged to be feasible. It may be determined that execution of the construction plan of the building for the design with a large amount is possible, and that execution of the construction plan of the building of the remaining plans is impossible. By doing so, it is possible to rationally establish the business while maximizing the profit in the land utilization business. At this time, if the bidding period is not necessarily fixed, such as when the bidding period consists of a basic period and an extension period, among the designs belonging to the same design group, when the bidding period for any one of the designs ends, the same design group It may be considered that the bidding period for all the designs belonging to the design has passed, or the bidding period for the designs belonging to the same design group may be deemed to have passed when the bidding period for all the designs ends.

As another example, when any one of the multiple designs belonging to the same design group satisfies the conditions for judging that the construction plan is possible, it is judged that the building plan for the design can be executed. However, it may be determined that execution of the construction plan of the building for other designs is not possible. In this case, the implementation of the construction plan is decided early, so the period until the implementation of the land utilization project can be reasonably shortened.

As a reference example, FIGS. 18 to 20 show a bidding system 20 in which the bidding for parcels is conducted independently of the bidding for construction costs. FIG. 18 is a conceptual diagram showing the overall configuration of a building bidding system 20 according to a reference example. Since there are many points in common between the bidding system 20 according to the reference example and the bidding system 10 according to the previously described embodiment, the corresponding configurations are denoted by the same reference numerals, and duplicate descriptions thereof are as follows. The description given with respect to the bidding system 10 above is incorporated.

In the bidding system 20, a network N is connected to a storage 100, a parcel bidding device 400, a propriety determination device 500, a client terminal 600, and a purchaser terminal 800. FIG. Although the automatic design device and construction cost bidding device provided in the bidding system 10 according to the previous embodiment are omitted, the automatic design device may also be used in the bidding system 20 in this reference example. However, the example shown in FIG. 18 shows the bidding system 20 as not using the automatic design device.

FIG. 19 is a flowchart showing the overall flow of processing executed using the bidding system 20 according to the reference example. In the bidding system 20, the building design based on the land information is done outside the bidding system 20 at step S2'. The design itself required here is the same as that described with reference to FIG. may ask a specific builder to make a proposal, including a design, by soliciting a public invitation. Alternatively, the design and construction may be separated and commissioned to separate designers and builders, respectively.

In any case, the determined design is stored in the storage 100 at step S3. At this stage, the builder has already been decided, and the construction cost has also been fixed, so in the subsequent step S5, only the lot is sold in the form of a bid.

FIG. 20 is a diagram showing the functional configuration of a block bidding device 400 according to the reference example. The parcel bidding device 400 provides a bidding environment for the sale of parcels in the land utilization business in step S5 of FIG. Let potential buyers bid.

The block bidding device 400 according to the reference example also has a design reception unit 401, a bid reception unit 402, and a bid management unit 403, as in the previous embodiment. A bid status notification unit 405 is provided. On the other hand, no recalculation receiving unit is provided. This is because, in the reference example, the construction cost has already been fixed and there is no change in the construction cost, so there is no need to recalculate the base selling price. In this parcel bidding device 400 as well, a plurality of different designs can be registered in the bidding management section 403 .

The operation of the parcel bidding device 400 according to the reference example is also the same as that according to the previous embodiment, except that the recalculation result of the selling price is not reflected. Therefore, the interface displayed on the purchaser terminal 800 by the parcel bidding device 400 may be the same as those shown in FIGS. 12 to 14, as in the previous embodiment, and these drawings and their explanations are used.

The functional configuration of the acceptability determination device 500 that executes step S6 in FIG. 19 may also be the same as that according to the previous embodiment, and is the same as that shown in FIG. 15, so this will be used. In the acceptability determination device 500 according to the reference example as well, a plurality of designs can be registered in the acceptability determination unit 508 . The bidding status received by the bidding status receiving unit 507 is only for the parcel notified by the parcel bidding device 400 .

Also, the flow in the judging device 509 of the propriety judging unit 508 may be the same as that according to the previous embodiment shown in FIG. The example shown in the figure is for a case where a basic period and an extended period are set as the bidding period, but there is another flow, for example, a flow in which only the basic period is the bidding period and no extended period is set. Alternatively, the bidding period may be ended when the conditions for judging that the construction plan is feasible are met, without waiting for the basic period to elapse.

Also, as in the modification of the previous embodiment, a plurality of different designs may be prepared for one land utilization project, and bids may be made for each design. In this case, the builder is asked to present multiple designs for the same piece of land that is to be utilized, and the bidding system 20 according to the reference example is used to bid for the section of the building. The competing designs submitted for bid may not necessarily be from the same builder.

The method of judging the feasibility of a building plan in the feasibility judging device 500 in this case is the same as the description of the modification of the previous embodiment with reference to FIG.

As is clear from the above description, the bidding system 20 according to the modified example, based on the design of a building having a plurality of sections to be sold independently, sells each of the sections through telecommunication lines. It has a block bidding device 400 that presents a reference price and makes bidders bid.

The sales reference price is the lowest selling price of the partition, and the partition bidding device 400 causes the purchaser to bid for the purchase price of the partition. It is a standard selling price, and the parcel bidding device 400 may cause the prospective purchaser to bid a premium amount added to the standard selling price.

Furthermore, the bidding system 20 according to the modification has a propriety determination device 500 that determines whether or not the construction plan of the building can be executed based on both the bid status and the bid price for the plurality of sections, Whether or not the construction plan of the building can be executed is determined by comparing the amount obtained by adding the necessary profit to the construction cost of the building and predetermined fixed costs, and the total bid amount for the plurality of lots. good.

Furthermore, in the bidding system 20 according to the modified example, a plurality of designs are prepared, and the section bidding device 400 presents the base sales price for each of the sections for each of the plurality of designs, and and the feasibility determination device 500 determines feasibility of execution of the construction plan of the building based on both the bid status and the bid amount for the plurality of sections for each of the plurality of designs. you can

Then, the feasibility determination device 500 executes the architectural plan of the building with respect to the design with the largest amount of profit from among the designs that satisfy the conditions determined to be executable at the time when a predetermined bidding period has elapsed. may be determined to be feasible, or when any one of the multiple designs satisfies the conditions for being determined to be executable, execution of the construction plan of the building for that design is deemed feasible. It may be determined.

1 computer, 1a CPU, 1b RAM, 1c external storage device, 1d GC, 1e input device, 1f I/O, 1g data bus, 1h monitor, 10, 20 bidding system, 100 storage, 200 automatic design device, 201 land information Input unit 202 Automatic design unit 203 Income and expenditure calculation unit 204 Map/terrain information DB 205 Law/regulation information DB 206 Design data template DB 207 Real estate information DB 208 Material master 209 Construction cost master 210 Management cost master , 211 recalculation unit, 300 construction cost bidding device, 301 design reception unit, 302 bid reception unit, 303 bid management unit, 304 bid evaluation unit, 305 bid status notification unit, 400 section bidding device, 401 design reception unit, 402 bid reception unit, 403 bid management unit, 405 bid status notification unit, 406 recalculation reception unit, 500 approval/disapproval determination device, 501 design reception unit, 507 bid status reception unit, 508 approval/disapproval determination unit, 509 determination device, 510 result transmission unit, 600 client terminal, 700 contractor terminal, 800 purchaser terminal.

Claims (8)

a construction cost bidding device for causing a builder to bid at least the construction cost of said building through a telecommunication line, based on the design of a building having a plurality of sections to be sold independently;
a parcel bidding device that presents a sales reference price for each of the parcels based on the design and allows bidders to bid;
has
The unit bidding device varies the sales reference price according to the bid amount for the construction cost of the building.
Building bidding system. 2. The building bidding system according to claim 1, wherein said sales reference price is the lowest selling price of said parcel, and said parcel bidding device causes said purchaser to bid for the purchase price of said parcel. 2. The building bidding according to claim 1, wherein said base selling price is a base selling price of said block, and said block bidding device causes said purchaser to bid a premium amount added to said base selling price. system. A propriety determination device that determines whether or not the construction plan of the building can be executed based on both the bid amount for the construction cost of the building and the bid status and bid amount for the plurality of sections, A building bidding system according to any one of claims 1 to 3. Whether or not the construction plan of the building can be executed is determined by the sum of the bid amount for the construction cost of the building and the profit required for the predetermined fixed cost, and the sum of the bid amounts for the plurality of sections. 5. The building bidding system of claim 4, determined by comparison. A plurality of said designs are prepared,
the building cost bidding device causes the builders to bid on at least a building cost of the building for each of a plurality of the designs;
The section bidding device presents the sales reference price for each of the sections for each of the plurality of designs, and causes the prospective purchaser to bid,
The propriety determination device determines, for each of the plurality of designs, the construction plan of the building based on both the bid amount for the construction cost of the building and the bid status and bid amount for the plurality of sections. determine whether the execution of
The building bidding system according to claim 4 or 5. The propriety judging device permits execution of the architectural plan of the building with respect to the design with the largest amount of profit from among the designs that satisfy the conditions for judging that execution is possible at the time when a predetermined bidding period elapses. 7. The building bidding system according to claim 6, wherein: 7. The feasibility determination device determines that the construction plan of the building for the design can be executed when any one of the plurality of designs satisfies a condition for feasibility. Bidding system for listed buildings.

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