Concrete selection method, concrete selection system, and program

Abstract

To select proper concrete for each cast-in-place concrete pile.SOLUTION: In a concrete selection system 1 for selecting concrete used for construction of a cast-in-place concrete pile, an evaluation result for selecting concrete is calculated by inputting nominal strength of concrete used for placing into evaluation calculation information for increasing fluidity required for concrete as the nominal strength increases, and information based on the evaluation result is output. In the evaluation calculation information, at least one of the pile diameter of the cast-in-place concrete pile and the space of the reinforcing bar is used as one of variables.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a concrete selection method, a concrete selection system, and a program. [Background technology]

[0002] When constructing a concrete structure, it is necessary to use fresh concrete (hereinafter simply referred to as concrete) that meets the required performance. For example, when a builder orders concrete from a production factory, he or she will specify the strength, slump value, etc.

[0003] Patent Document 1 describes a system for managing procedures related to concrete ordering and delivery. In this system, a concrete purchaser sends order information, such as slump, air content, and compressive strength, to a producer using a buyer's computer. The producer manufactures concrete based on the order information. During the manufacturing process, the factory acquires manufacturing information by measuring various values ​​of the concrete using measuring equipment and sends the information to the buyer's computer. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-24631 Summary of the Invention [Problem to be solved by the invention]

[0005] Concrete is ordered based on the design standard strength of the concrete structure. For example, for cast-in-place concrete piles, a standard concrete with a slump value of 21 cm is often used. However, because there are various construction methods and structures for cast-in-place concrete piles, even if the same concrete is used as for a cast-in-place concrete pile that has already been cast without any problems, there is a possibility that problems will occur. For this reason, it has been difficult for contractors to select the appropriate concrete for the cast-in-place concrete pile to be cast. [Means for solving the problem]

[0006] The present disclosure provides a method for selecting concrete for a cast-in-place concrete pile, which calculates an evaluation result by inputting the nominal strength of the concrete to be poured into evaluation calculation information that increases the required fluidity of the concrete as the nominal strength increases, and outputs information based on the evaluation result.

[0007] The present disclosure provides a concrete selection system for cast-in-place concrete piles, which calculates an evaluation result by inputting the nominal strength of the concrete to be poured into evaluation calculation information that increases the fluidity of the concrete supplied as the nominal strength increases, and outputs information based on the evaluation result.

[0008] The present disclosure provides a program for selecting concrete for a cast-in-place concrete pile, which, when executed by a control unit, calculates an evaluation result by inputting the nominal strength of the concrete to be poured into evaluation calculation information that increases the required fluidity of the concrete as the nominal strength increases, and outputs information based on the evaluation result. [Effects of the Invention]

[0009] According to the present disclosure, an appropriate concrete can be selected for each cast-in-place concrete pile. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic diagram of one embodiment of a concrete selection system. [Figure 2] FIG. 2 is a schematic diagram showing an example of construction information according to the embodiment. [Figure 3] FIG. 2 is a schematic diagram illustrating a hardware configuration of the information processing apparatus according to the embodiment. [Figure 4] FIG. 10 is a diagram showing an example of an input screen in the embodiment. [Figure 5] 10 is a flowchart showing an example of a concrete selection procedure according to the embodiment. [Figure 6] FIG. 1 is a schematic diagram of another embodiment of a concrete selection system. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of a concrete selection method, a concrete selection system, and a program will be described. 1, in this embodiment, the concrete selection system 1 includes an information processing device 10 used by a builder 100 (purchaser). Based on the selection result by the information processing device 10, the builder 100 places an order with a producer 101 such as a concrete factory.

[0012] The information processing device 10 is a multifunction telephone (smartphone), a tablet terminal, a personal computer, etc. The information processing device 10 includes an evaluation unit 11, a selection unit 12, an evaluation function storage unit 13, and a construction information storage unit 14.

[0013] The information processing device 10 selects concrete suitable for the target cast-in-place concrete pile. Reinforcing bars are concentrated particularly at the pile head in cast-in-place concrete piles. Therefore, the pile head is more prone to concrete filling defects than other areas. Furthermore, assembly components such as spacers or reinforcing rings may impede the vertical flow of concrete, potentially causing the concrete to entrain stabilizing fluid and creating weak areas. To address these issues, using high-fluidity concrete is one of the most effective solutions. However, because high-fluidity concrete is more expensive than standard concrete, it is recommended to use it only when necessary. Furthermore, since there are cases where no problems occur even when using standard concrete, it is difficult to determine the need for high-fluidity concrete. Therefore, the information processing device 10 supports the builder 100 by evaluating the need for high-fluidity concrete for each site.

[0014] The evaluation unit 11 calculates the evaluation result by inputting a value into an evaluation function for selecting concrete. Specifically, the evaluation unit 11 calculates the evaluation result by inputting the nominal strength into the evaluation function. As the nominal strength of concrete increases, the fluidity tends to decrease, and therefore there is a greater need to use high-fluidity concrete. For this reason, the evaluation function increases the fluidity required of the concrete used for pouring as the nominal strength of the concrete increases. The nominal strength is calculated using the design standard strength, etc. The evaluation function corresponds to the evaluation calculation information.

[0015] The selection unit 12 selects concrete according to the evaluation results. Specifically, the selection unit 12 selects the concrete slump, concrete slump flow, or concrete type as information based on the evaluation results calculated by the evaluation unit 11. Slump is the length of the top of a slump cone filled with concrete lowered by its own weight when it is pulled up. Slump flow is a parameter that indicates the fluidity of concrete, and is specified by the diameter of the spread of concrete that flows out when the slump cone filled with concrete is pulled up.

[0016] The evaluation function storage unit 13 stores functions used by the evaluation unit 11. A function is provided for each of a plurality of items. The items are set as items related to the structure of cast-in-place concrete piles and items related to the properties of concrete.

[0017] The construction information storage unit 14 stores construction information 20 (see FIG. 2). The construction information 20 includes information before concrete is poured and information on cast-in-place concrete piles that have been constructed in the past. The builder 100 uses the information processing device 10 to select concrete suitable for the target cast-in-place concrete pile, and places an order with the producer specifying the selected concrete. The concrete produced based on the builder's 100 order is transported to the unloading point by a truck mixer 102 while being mixed to prevent material separation.

[0018] A pile hole 105 is excavated in the ground at the unloading point. A reinforcing bar cage 106 is erected into this pile hole 105. If a core reinforcing bar 107 is used, the core reinforcing bar 107 is installed. Thereafter, a tremie pipe 108 is erected in the pile hole 105, and concrete 110 is poured through the tremie pipe 108.

[0019] Fig. 2 is an example of the construction information 20. In the example of Fig. 2, the construction information 20 shows a past construction history. For example, the construction information 20 includes information about the structure of a cast-in-place concrete pile and information about the properties of the concrete. Specifically, the construction information 20 includes, as information about the structure of the concrete pile, the pile diameter (pile diameter), the spacing between rebars, the time of driving, the density of the rebars, and the presence or absence of a core rebar.

[0020] The construction information 20 may include the cross-sectional area of ​​the pile instead of the pile diameter. The rebar spacing is the distance from the surface of the rebar near the top of the pile to the surface of the adjacent rebar, and indicates, for example, the spacing of the hoop reinforcement (hoop reinforcing bars) of the rebar cage 106. Instead of the rebar spacing, the spacing of the rebars may be stored. The rebar spacing is the relative distance between the central axes of adjacent rebars near the top of the pile. In the case of concrete with low fluidity, the flow of concrete from below is suppressed by the rebars or assembly members of the rebar cage, but when concrete covers the rebars or assembly members, the stabilizing liquid is trapped, and brittle concrete containing the stabilizing liquid may be produced.

[0021] The driving time can be selected, for example, during the high temperature period, the low temperature period, or immediately before or after switching to the delayed type. The period immediately before or after switching to the delayed type refers to the period immediately before the type of chemical admixture used in the concrete is switched from the standard type to the delayed type, or immediately after the delayed type is switched to the standard type. The rebar density indicates whether the concrete pile is designed using a construction method in which the rebars are densely arranged. The rebar density can be at least one of the following: whether or not the rebar cage 106 is double-arranged, whether or not the pile head is semi-rigidly connected, and whether or not the bundled rebar is used.

[0022] The construction information 20 also includes information on the properties of concrete, such as nominal strength, transportation time, unit water content, and type of cement. The nominal strength indicates the strength specified when ordering from the concrete factory. The transportation time is the time required to transport the concrete from the concrete factory of the producer 101 to the unloading point. The unit water content is the amount of water per 1 m of concrete. 3 The type of cement varies depending on the material and properties, and includes blast furnace cement type B, type C, moderate heat Portland cement, low heat Portland cement, etc.

[0023] The construction information 20 also includes a total score for selecting concrete and inspection results of the finished form (not shown). The inspection results of the finished form are fed back to the evaluation function, and the coefficients of the evaluation function and the like are revised.

[0024] 3 is a schematic diagram showing the hardware configuration of the information processing device 10. The information processing device 10 includes a processor H15, a communication device H11, and a storage device H14, which are connected via a system bus H17, etc. Note that this hardware configuration is an example, and it may also be realized by other hardware.

[0025] The communication device H11 is an interface that establishes a communication path with other devices via a network (not shown) such as the Internet, and executes data transmission and reception. The storage device H14 (computer-readable medium) is, for example, a ROM, a RAM, a hard disk, etc. The storage device H14 includes any available recording medium that can be accessed by a general-purpose or special-purpose computer.

[0026] A concrete selection program is stored in the storage device H14. The storage device H14 also constitutes an evaluation function storage unit 13 and a construction information storage unit 14. Examples of the processor H15 include a CPU and an MPU. The processor H15 is not limited to a processor that performs all of its own processing using software. For example, the processor H15 may include a dedicated hardware circuit (e.g., an application-specific integrated circuit (ASIC)) that performs hardware processing for at least part of the processing it performs. That is, the processor H15 may be configured as any of the following:

[0027] [1] One or more processors that operate according to a computer program (software). [2] One or more dedicated hardware circuits that perform at least some of the various processes [3] Circuits containing combinations of these The information processing device 10 may also include an input device H12 such as a touch panel, a mouse, a keyboard, or a microphone, and a display device H13 such as a liquid crystal panel or an organic EL panel.

[0028] 4 is an example of an input screen 21 displayed on the display device H13 by the evaluation unit 11. The input screen 21 includes items 22 related to the structure of the pile, items 23 related to the properties of the concrete, and items 24 related to the conditions for pouring the concrete. The input screen 21 includes an input field 25 for inputting information for each item.

[0029] A function is associated with each of the items 22 to 24. The evaluation unit 11 inputs values ​​in different units into each function to obtain a score indicating the need for high-fluidity concrete. The higher the score, the more high-fluidity concrete is required. The function has a variable for each of the items 22 to 24. The scores calculated by the function for each of the items 22 to 24 can be summed. Each function includes a parameter for weighting each of the items 22 to 24. In other words, the functions corresponding to the items 22 to 24 are weighted so that the greater the impact that the function has on the fluidity of the concrete, the greater the absolute value of the score that is calculated.

[0030] The function corresponding to item 22 for pile diameter returns a higher score the larger the pile diameter. The function corresponding to item 22 for rebar gap returns a higher score the smaller the input value for gap. In addition, the function corresponding to item 22 for rebar density returns a higher score when a construction method that densifies the rebars is used. The function corresponding to item 22 for core rebar returns a higher score when core rebars are present.

[0031] The function corresponding to the nominal strength item 23 returns a higher score the higher the nominal strength. The function corresponding to the unit water volume item 23 returns a higher score the smaller the unit water volume. Additionally, the cement type item 23 returns a higher score the higher the viscosity of the cement contained in the concrete.

[0032] The function corresponding to the item 24 for the driving time returns a high score during the high temperature period and a low score during the low temperature period. The function corresponding to the item 24 for the transportation time returns a higher score the longer the transportation time.

[0033] The evaluation unit 11 totals the scores calculated for each of the items 22 to 24 to evaluate the necessity of high fluidity concrete. The concrete selection procedure will be described with reference to FIG.

[0034] The evaluation unit 11 acquires input information related to the structure of the concrete pile and the properties of the concrete (step S1). The evaluation unit 11 may acquire various values ​​input by the builder 100 on the input screen 21 as the input information. Alternatively, the evaluation unit 11 may acquire information obtained by reading design drawings or specifications stored in the information processing device 10 as the input information.

[0035] The evaluation unit 11 calculates the evaluation result by inputting the input values ​​for each of the items 22 to 24 into the evaluation function corresponding to each of the items 22 to 24 (step S2). The evaluation unit 11 calculates the total score by adding up the scores indicating the evaluation results for each of the items 22 to 24.

[0036] The selection unit 12 selects a concrete from the multiple candidates according to the evaluation results (step S3). The selection candidates are stored in advance in the information processing device 10. As described above, the selection unit 12 selects the concrete slump, concrete slump flow, or concrete type. As an example, if the total score is "10 points or less," the selection unit 12 proposes concrete with a slump value of 21 cm, as high-fluidity concrete is not necessary. Furthermore, if the total score is in a range of "more than 10 points and less than 15 points," the evaluation unit 11 proposes concrete with a slump flow value of approximately 50 cm. Furthermore, if the total score is in a range of "more than 15 points," the evaluation unit 11 proposes concrete with a slump flow value of approximately 55 cm. At this time, the selection unit 12 outputs this information to the display device H13 as information based on the evaluation results.

[0037] The selection unit 12 registers the calculated total score in the construction information 20. After the construction worker 100 has finished pouring the selected concrete, he / she checks the finished shape and registers the results of various tests in the construction information 20. Depending on the test results, etc., the parameters related to the weighting of the evaluation function are updated as necessary.

[0038] <Effects of this embodiment> As described above, according to the above embodiment, the following effects can be obtained. (1) According to the above embodiment, the concrete selection system 1 calculates the evaluation result by inputting the values ​​of each of the items 22 to 24 into the evaluation function for each of the items 22 to 24. Therefore, it is possible to select an appropriate concrete for the target cast-in-place concrete pile.

[0039] (2) The concrete selection system 1 performed evaluation using an evaluation function that increases the fluidity required for concrete used for pouring as the nominal strength of the concrete increases. Therefore, it is possible to appropriately evaluate the need for high-fluidity concrete.

[0040] <Example of change> The above-described embodiment can be modified as follows: Each embodiment and the following modifications can be combined with each other to the extent that no technical contradiction occurs.

[0041] In the above embodiment, the selection unit 12 selects the concrete slump, concrete slump flow, or concrete type, but it may also select multiple of these. Furthermore, the selection unit 12 may output the above-mentioned total score as the evaluation result, instead of the concrete slump, concrete slump flow, or concrete type, as information based on the evaluation result. The builder 100 can refer to the total score output on the display device H13 and select concrete according to the total score.

[0042] In the above embodiment, the information processing device 10 selected concrete with an appropriate fluidity and then output the result to the display device H13. In addition, when the builder 100 performs an operation to confirm the order for the selected concrete, the information processing device 10 may further transmit the order to a device or the like used by the producer 101. At this time, the information processing device 10 may also transmit the construction information 20 together with the order to a device or the like used by the producer 101. In this case, the producer 101 can confirm the concrete desired by the builder 100.

[0043] In the above embodiment, a case has been described in which an appropriate concrete is selected by an information processing device used by the builder 100. Alternatively, an information processing system used by a producer (hereinafter referred to as a producer system) may select an appropriate concrete and transmit information about the selected concrete to the information processing device used by the builder 100.

[0044] FIG. 6 shows an example of a concrete selection system 1 used by a builder 100 and a producer 101. A producer system 50 used by the producer 101 includes one or more information processing devices. This information processing device has the same configuration as the information processing device 10 described above. That is, the producer system 50 includes a concrete information storage unit 51 that stores detailed information on concrete that can be ordered, in addition to the evaluation unit 11, selection unit 12, and evaluation function storage unit 13 described above. The detailed information on concrete includes, for example, a slump value, a slump flow value, and a price per unit volume (unit price). The construction information storage unit 14 in the above embodiment may be included in the information processing device 10 or the producer system 50.

[0045] The producer system 50 acquires order information from the information processing device 10 of the builder 100. The evaluation unit 11 of the producer system 50 calculates a total score using an evaluation function. The selection unit 12 selects the most suitable concrete from the detailed information of the concrete based on the total score.

[0046] Once the producer system 50 has selected at least one optimal concrete, it transmits it to the information processing device 10 of the builder 100. The builder 100 checks the selected concretes and selects the concrete to order. The information processing device 10 transmits the type of concrete and the ordered volume (quantity) specified by the builder 100 to the producer system 50. The producer system 50 receives the order from the builder 100 and produces the concrete with the specified contents.

[0047] The producer system 50 may transmit measurement values ​​(e.g., slump flow) of concrete measured in the production process to the information processing device 10. The information processing device 10 may update the construction information 20 using the presence or absence of defects in the cast-in-place concrete piles and the measurement values ​​of the concrete.

[0048] The producer system 50 may have a database collected from at least one customer. The database stores construction information 20 indicating the construction history. Of the construction information 20, the construction location and date and time may be information that is not disclosed to the builder 100. The construction information 20 includes input values ​​for each item 22 to 24, the slump value and slump flow value of the concrete used, the presence or absence of defects, etc.

[0049] When the producer system 50 acquires the values ​​of each item 22 to 24 input by the builder 100 as new construction information 20, it extracts from the construction history information similar to the newly acquired construction information 20. At this time, the producer system 50 may calculate the discrepancy between the score for each item 22 to 24 obtained by inputting the construction information 20 into an evaluation function and the score for each item 22 to 24 in the construction history, and extract the one with the smallest discrepancy as having a high degree of similarity. In addition to the information on the selected concrete, the producer system 50 transmits the most similar construction information 20 to the information processing device 10 of the builder 100. The information processing device 10 uses the most similar construction information 20 to select concrete.

[0050] The concrete selection system 1 may store evaluation calculation information for each item other than the items 22 to 24 exemplified in the above embodiment. For example, the concrete selection system 1 may have evaluation functions for items related to concrete such as slump value, water-cement ratio, air content, and fine aggregate ratio, as well as items related to external factors such as humidity, temperature, and weather obtained from a weather forecast.

[0051] In the above embodiment, the evaluation calculation information is an evaluation function having variables and parameters. However, the evaluation calculation information may also be a table associating variable values ​​with scores, a trained model, or the like.

[0052] Next, the technical ideas that can be understood from the above-described embodiment and other examples will be described below. [A] A method for selecting concrete, in which the evaluation calculation information uses structural information of the concrete pile to be poured as one of the variables.

[0053] [B] A method for selecting concrete, in which the evaluation calculation information is a variable that is information regarding the flow resistance of the concrete due to the reduction in fluidity caused by the structure of the cast-in-place concrete pile. [C] A concrete selection method in which the evaluation calculation information uses the transportation time of the concrete as one of the variables.

[0054] [D] The concrete selection method according to claim 1, wherein the evaluation calculation information uses the unit water content of the concrete as one of the variables. [Explanation of symbols]

[0055] 1...concrete selection system, 10...information processing device, 11...evaluation unit, 12...selection unit, 20...construction information, 21...input screen.

Claims

1. A method for selecting concrete to be used for casting cast-in-place concrete piles, comprising: The evaluation result for selecting the concrete is calculated by inputting the nominal strength of the concrete to be poured into evaluation calculation information that increases the fluidity required of the concrete as the nominal strength increases, A concrete selection method that outputs information based on the evaluation results.

2. The concrete selection method according to claim 1 , wherein the evaluation calculation information uses the pile diameter of the cast-in-place concrete pile as one of the variables.

3. The concrete selection method according to claim 1 , wherein the evaluation calculation information uses a gap between reinforcing bars of the cast-in-place concrete pile as one of the variables.

4. A concrete selection system for selecting concrete to be used for casting a cast-in-place concrete pile, The evaluation result for selecting the concrete is calculated by inputting the nominal strength of the concrete to be poured into evaluation calculation information that increases the fluidity required of the concrete as the nominal strength increases, A concrete selection system that outputs information based on the evaluation results.

5. A program for selecting concrete to be used for casting a cast-in-place concrete pile when executed by an information processing device, The information processing device, The evaluation result for selecting the concrete is calculated by inputting the nominal strength of the concrete to be poured into evaluation calculation information that increases the fluidity required of the concrete as the nominal strength increases, and a program that outputs information based on the evaluation results.

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