Soil mortar manufacturing system, soil mortar manufacturing method, and soil mortar casting method

Abstract

To provide a soil mortar manufacturing system, a soil mortar manufacturing method, and a soil mortar casting method capable of efficiently manufacturing foaming agent-containing soil mortar even with a small amount and capable of manufacturing and casting the soil mortar in a case where a work space of the casting site is relatively narrow.SOLUTION: A soil mortar manufacturing system 1 comprises: a slurry preparation device 2 that prepares slurry S by mixing a base material B and water W; a pump vehicle 4 into which the slurry S discharged from the slurry preparation device 2 is loaded; a foaming agent generation device 6 that generates a foaming agent F; solidifying material supply means 3 that supplies a solidifying material C to the slurry S; and a soil mortar manufacturing device 5 that mixes the slurry S supplied from the pump vehicle 4 and the foaming agent F supplied from the foaming agent generation device 6 to produce soil mortar M.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a soil mortar manufacturing system, a soil mortar manufacturing method, and a soil mortar pouring method. [Background technology]

[0002] When constructing underground structures or buried objects, voids formed during construction may need to be backfilled. If soil generated during excavation is used as backfill material, the amount of soil to be disposed of can be reduced, and the effort and cost required for disposing of the remaining soil can be reduced.

[0003] Backfilling work requires transporting and filling the backfill material in a designated location. However, if the backfill material is transported and filled manually in places where heavy machinery cannot enter, the work is time-consuming. For this reason, in some cases, self-compacting materials (such as soil mortar or liquefied soil, which is made by adding water and solidifying agents to soil and sand to give it fluidity) are used as backfilling material to improve workability.

[0004] For example, Patent Document 1 discloses a construction method in which water is added to waste soil (base material) such as excavated soil generated at a construction site, etc., to produce muddy water, which is then transported in a mixer truck to a site where the liquefied treated soil will be poured, and at the pouring site, a solidifying agent slurry such as cement milk or cement mortar is added to the mixer truck and stirred and mixed with the muddy water to produce the liquefied treated soil, which is then poured into the pouring location.

[0005] Patent Document 2 also discloses a construction method in which cement, water, and admixtures are first mixed in a slurry mixer to produce cement slurry, and then on-site generated soil, adjusted water, and the cement slurry are mixed in a continuous mixer to produce soil mortar, after which the soil mortar is loaded into an agitator vehicle via a pump truck and transported to the casting site by the agitator vehicle. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-63759 [Patent Document 2] Japanese Patent Publication No. 2022-168914 Summary of the Invention [Problem to be solved by the invention]

[0007] In recent years, there has been a demand for high-strength materials with unconfined compressive strength exceeding 1 MPa as backfill material. On the other hand, high strength has generally not been expected from liquefied treated soil, which uses a clayey soil-based base material. Furthermore, the construction method described in Patent Document 1 requires mixing the solidification material slurry with the muddy water immediately before pouring, which requires securing land around the pouring site to accommodate equipment such as a device for producing the solidification material slurry, a device for supplying the produced solidification material slurry to a mixer truck, and a pump truck used to pour the liquefied treated soil.

[0008] Furthermore, the construction method of Patent Document 2 makes it possible to produce a high-strength backfill material (soil mortar) using a sand-based material as the base material, but it uses a continuous mixer to continuously produce the soil mortar. As a result, it is not possible to produce small amounts of soil mortar, and construction locations are limited. On the other hand, if the base material made of a sand-based material is introduced into a batch mixer instead of a continuous mixer, there is a risk of material separation in the batch mixer, so it is necessary to mix it for a sufficient amount of time, which is inefficient. Furthermore, when adding an air-forming agent to soil mortar, it is necessary to pour the mortar into the construction site while the air-forming agent's effect is still in effect, so if the air-forming agent is added too early, it may not be possible to transport it far away.

[0009] The present invention aims to propose a soil mortar manufacturing system, a soil mortar manufacturing method, and a soil mortar pouring method that enable efficient production of soil mortar containing an air foaming agent even in small quantities, and that enable production and pouring of soil mortar even when the working space at the pouring location is relatively narrow. [Means for solving the problem]

[0010] The soil mortar production system of the present invention for solving the above problems includes a slurry production device that mixes a base material and water to produce a slurry, a pump truck into which the slurry discharged from the slurry production device is introduced, an aerating agent generator that produces an aerating agent, solidification agent supply means that supplies a solidification agent to the slurry, and a soil mortar production device that produces soil mortar by mixing the slurry supplied from the pump truck with the aerating agent supplied from the aerating agent generator. The solidification agent supply means may supply the solidification agent to the slurry production device, or may supply the solidification agent to the soil mortar production device.

[0011] The soil mortar manufacturing method of the present invention includes a slurry manufacturing step of mixing a base material with water to manufacture a slurry, a slurry relay step of feeding the slurry into a pump vehicle, and a soil mortar manufacturing step of mixing the slurry with an air foaming agent to produce soil mortar. In the soil mortar manufacturing step, the slurry is fed into a soil mortar manufacturing apparatus by the pump vehicle, and the air foaming agent is fed into the soil mortar manufacturing apparatus.

[0012] Furthermore, the soil mortar pouring method of the present invention includes a slurry production process in which base material and water are introduced into a slurry production device at a location away from the soil mortar pouring location to produce a slurry; a slurry relay process in which the slurry is transferred from the slurry production device to a pump truck; an aerating agent injection process in which the pump truck introduces the slurry and an aerating agent into a soil mortar production device consisting of an agitator truck; a soil mortar production process in which the soil mortar production device agitates the slurry and the aerating agent to produce soil mortar and moves the soil mortar to the soil mortar pouring location using the soil mortar production device; and a pouring process in which the soil mortar is discharged from the soil mortar production device and poured.

[0013] According to the soil mortar production system, soil mortar production method, and soil mortar pouring method, soil mortar can be produced efficiently even when a small amount of soil mortar is produced. The air foaming agent is supplied to the soil mortar production device together with the slurry according to the amount of slurry supplied via the pump truck, so efficient mixing is possible even when the soil mortar production device does not have high mixing performance. Therefore, material separation is difficult, and soil mortar can be produced efficiently even in small amounts. Furthermore, because the air foaming agent is supplied to the soil mortar production device, the soil mortar can be transported farther than when the air foaming agent is supplied to a slurry production device.

[0014] Furthermore, when the soil mortar production device is an agitator vehicle, the soil mortar production process can be performed by moving the soil mortar production device to the pouring site while stirring the slurry and the air foaming agent. In this way, soil mortar can be poured even when there is no space at the pouring site to install an air foaming agent generator, a pump vehicle, etc.

[0015] Furthermore, if the slurry production apparatus is an agitator vehicle, the slurry production apparatus can be moved from the location where the base material and water are introduced to the vicinity of the pump vehicle during the slurry production process. In other words, even if the material storage area where the base material is stored and the location where the pump vehicle are located are far apart, soil mortar can be produced by moving the slurry production apparatus. Note that the agitator vehicle used in the slurry production apparatus and the agitator vehicle used in the soil mortar production apparatus may be the same vehicle. [Effects of the Invention]

[0016] The soil mortar manufacturing system, soil mortar manufacturing method, and soil mortar pouring method of the present invention make it possible to efficiently produce soil mortar even in small quantities, and to produce and pour soil mortar even when the working space at the pouring location is relatively narrow. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a schematic diagram of a soil mortar production system according to an embodiment of the present invention. [Figure 2] 1 is a flowchart showing the steps of a soil mortar pouring method. [Figure 3] FIG. 10 is a graph showing the results of an experiment conducted to confirm the performance of the soil mortar produced by the soil mortar production method of this embodiment, and is a graph showing the change in flow value over time after the addition of the foaming agent. [Figure 4] This figure shows the results of an experiment conducted to confirm the performance of soil mortar produced by the soil mortar manufacturing method of this embodiment, and is a graph showing the relationship between the elapsed time after the addition of the solidification material and the strength of the solidified body. DETAILED DESCRIPTION OF THE INVENTION

[0018] In this embodiment, a case will be described in which soil mortar is used as a backfilling material to backfill excavated areas in construction work. Fig. 1 shows an overview of a soil mortar pouring method using a soil mortar production system 1 of this embodiment, and Fig. 2 shows the steps of the soil mortar pouring method of this embodiment. As shown in Fig. 1, soil mortar M is produced by the soil mortar production system 1 and then transported to a predetermined location and poured.

[0019] As shown in Fig. 1, the soil mortar production system 1 includes a slurry production device 2, a solidification material supply means 3, a pump vehicle 4, a soil mortar production device 5, and an air foaming agent generator 6. In this embodiment, the soil mortar has an unconfined compressive strength of 200 kPa at 7 days, a flow value of 160 mm or more, a bleeding rate of less than 3% after 3 hours, and a wet density of 1.35 Mg / m 3 The above soil mortar M is manufactured. The standard mix proportions for soil mortar M are shown in Table 1. The quality and mix proportions of soil mortar M are not limited and may be determined as appropriate.

[0020] [Table 1]

[0021] The soil mortar M is produced by adding water W, a solidification material C, an air-forming agent F, etc. to recycled sandy soil (base material B) stored at a location away from the pouring site and mixing them, and then transporting it to a predetermined location and pouring it. As shown in Fig. 2, the soil mortar pouring method (soil mortar production method) of this embodiment includes a slurry production step S1, a slurry relay step S2, an air-forming agent injection step S3, a soil mortar production step S4, and a pouring step S5.

[0022] The slurry production process S1 is a process for producing a slurry S. In the slurry production process S1, a base material B and water W are introduced into a slurry production apparatus 2 at a location away from the soil mortar placement location. A solidification material supply means 3 is disposed near the storage location of the base material B, and a solidification material C is introduced from the solidification material supply means 3 into the slurry production apparatus 2. The slurry production apparatus 2 of this embodiment is an agitator truck. The storage location (material storage area) of the base material B is away from the installation location of the pump truck 4, and the agitator truck, which is the slurry production apparatus 2, agitates the base material B, water W, and solidification material C while moving from the introduction location of the base material B, water W, and solidification material C to the vicinity of the pump truck 4. Note that the distance from the storage location of the base material B to the installation location of the pump truck 4 is a distance that makes it difficult to transport the base material B to the pump truck 4 using piping or a conveyor belt, and may be, for example, several hundred meters to several tens of kilometers.

[0023] 1, the slurry relay step S2 is a step of transferring the slurry S from the slurry production apparatus 2 to the pump vehicle 4. After the agitator vehicle, which is the slurry production apparatus 2, is moved to a predetermined position, the slurry S containing the solidification material, which was produced by stirring the base material B, water W, and solidification material C during the movement, is discharged from the slurry production apparatus 2 and charged into the pump vehicle 4.

[0024] The aerating agent adding step S3 is a step of adding an aerating agent F to the slurry S. In the aerating agent adding step S3, as shown in FIG. 1, the slurry S supplied from the slurry production apparatus 2 to the pump vehicle 4 is supplied to the soil mortar production apparatus 5. In this embodiment, the soil mortar production apparatus 5 is an agitator vehicle. An aerating agent generating device 6 that generates (foams) the aerating agent F is disposed near the soil mortar production apparatus 5, and the aerating agent F is added to the soil mortar production apparatus 5 together with the slurry S. The aerating agent F is supplied from the aerating agent generating device 6 to the soil mortar production apparatus 5 in accordance with the amount of slurry S discharged from the pump vehicle 4. This allows the aerating agent F to be supplied evenly to the slurry S, making it easier to ensure the homogeneity of the soil mortar M.

[0025] The soil mortar production process S4 is a process of mixing the slurry S and the air foaming agent F to produce soil mortar M. In the soil mortar production process S4, an agitator vehicle, which is a soil mortar production device 5, moves to the pouring site and mixes the slurry S supplied from the pump vehicle 4 and the air foaming agent F supplied from the air foaming agent generator 6, thereby producing soil mortar M. The distance from the installation location of the pump vehicle 4 to the pouring site is a distance at which it is difficult to pump the soil mortar M, and may be, for example, from several hundred meters to several tens of kilometers.

[0026] The pouring step S5 is a step of pouring the soil mortar M. After the soil mortar production apparatus 5 is moved to a predetermined position, the soil mortar M is discharged from the soil mortar production apparatus 5 and poured.

[0027] As described above, the soil mortar production system 1 of this embodiment and the soil mortar pouring method (soil mortar production method) using the same can efficiently produce soil mortar M even in small quantities (a quantity that can be transported by an agitator truck). Therefore, it is possible to produce the soil mortar M in the required amount, which is more economical than producing soil mortar M continuously using a continuous mixer.

[0028] The foaming agent F is supplied to the soil mortar production apparatus 5 together with the slurry S according to the amount of the slurry S supplied via the pump vehicle 4, so that the materials can be mixed efficiently even if the mixing performance of the soil mortar production apparatus 5 is not high. Therefore, the materials are less likely to separate, and the soil mortar M can be produced efficiently even in small amounts.

[0029] Since the slurry manufacturing device 2 is an agitator vehicle, even if the material storage area where the base material B etc. is stored is far from the location where the pump vehicle 4 etc. can be placed, the soil mortar M can be manufactured by moving the agitator vehicle which is the slurry manufacturing device 2.

[0030] Furthermore, since the air foaming agent F is supplied to the soil mortar production apparatus 5, the soil mortar M can be transported farther than when the air foaming agent F is supplied to the slurry production apparatus 2. Furthermore, since the soil mortar production apparatus 5 is an agitator vehicle, in the soil mortar production step S4, the agitator vehicle, which is the soil mortar production apparatus 5, mixes the slurry S and the air foaming agent F while moving to the pouring location, so that the soil mortar M can be poured even if there is no space available at the pouring site to install the air foaming agent generator 6, the pump vehicle 4, etc.

[0031] Here, we present the results of a test conducted to confirm the change in flow value after the addition of foaming agent F. Figure 3 shows the relationship between cylinder flow and elapsed time after the addition of foaming agent. In this experiment, a comparison was made between the case where the foaming agent was allowed to stand after addition (Comparative Example) and the case where the foaming agent was continuously stirred (Example). As shown in Figure 3, the cylinder flow value 180 minutes after the addition of foaming agent was approximately 80% of that immediately after addition (immediately after mixing) in the Example, while it was approximately 50% in the Comparative Example. For example, if the flow value immediately after mixing was 200 mm, the flow value after 180 minutes in the Example was reduced to approximately 160 mm. The Liquefied Treated Soil Utilization Technical Manual states that if the flow value of liquefied treated soil is approximately 160 mm, it can be pumped up to a distance of 200 m or more. Therefore, according to the soil mortar manufacturing method of this embodiment, the soil is transported while being stirred with foaming agent F added, allowing it to be transported to a designated location while maintaining its performance as a backfill material.

[0032] Next, the results of an experiment conducted to confirm the strength of the solidified soil mortar M produced by the soil mortar production method of this embodiment are shown. In this experiment, the unconfined compressive strength at 7 days was measured for soil mortar M when it was left to stand after production (Comparative Example) and when it was continuously mixed (Example). The unconfined compressive strength was measured immediately after production, and after 60 minutes, 120 minutes, and 180 minutes. Figure 4 shows the relationship between unconfined compressive strength and elapsed time. As shown in Figure 4, it was confirmed that the strength was not affected when the soil mortar was continuously mixed, compared to when it was left to stand.

[0033] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and each of the above-described components can be modified as appropriate within the scope of the invention. In the above embodiment, the solidification material C is supplied to the slurry manufacturing apparatus 2, but the timing of supplying the solidification material C to the slurry S is not limited, and for example, the solidification material C may be added to the soil mortar manufacturing apparatus 5 when the slurry S is supplied from the pump truck 4 to the soil mortar manufacturing apparatus 5.

[0034] The agitator vehicle used in the slurry production apparatus 2 and the agitator vehicle used in the soil mortar production apparatus 5 may be the same vehicle. In other words, when the amount of slurry S produced in the slurry production step S1 is an amount that can be received by the pump vehicle 4, the same vehicle can be used as the agitator vehicle used in the slurry production apparatus 2 and the agitator vehicle used in the soil mortar production apparatus 5 by charging all of the slurry S in the agitator vehicle into the pump vehicle 4 and then supplying the aerating agent F from the pump vehicle 4 to the same agitator vehicle while supplying the slurry S.

[0035] The slurry production apparatus 2 and the soil mortar production apparatus 5 do not necessarily have to be agitator vehicles. For example, if the slurry production apparatus 2 and the pump vehicle 4 can be placed near the storage location of the base material B, the slurry production apparatus 2 does not have to be an agitator vehicle. [Explanation of symbols]

[0036] 1. Soil mortar production system 2. Slurry manufacturing equipment 3 Solidification material supply means 4. Pump truck 5. Soil mortar manufacturing equipment 6. Foam generator B Base material C Solidifying material F. Foaming agent M Soil Mortar S Slurry W water S1 Slurry manufacturing process S2 Slurry relay process S3 Air foam injection process S4 Soil mortar manufacturing process S5 Pouring process

Claims

1. a slurry production device that mixes a base material and water to produce a slurry; a pump vehicle into which the slurry discharged from the slurry production apparatus is introduced; a foaming agent generator for generating a foaming agent; a solidification material supplying means for supplying a solidification material to the slurry; A soil mortar manufacturing device that mixes the slurry supplied from the pump truck with the foaming agent supplied from the foaming agent generator to produce soil mortar. A soil mortar manufacturing system.

2. 2. The soil mortar production system according to claim 1, wherein the solidifying material supplying means supplies the solidifying material to the slurry production device.

3. The soil mortar production system according to claim 1, wherein at least one of the slurry production device and the soil mortar production device is an agitator vehicle.

4. a slurry production step of mixing a base material and water to produce a slurry; a slurry relay step of charging the slurry into a pump vehicle; A soil mortar manufacturing method comprising: a soil mortar manufacturing step of mixing the slurry and an air foaming agent to produce soil mortar; The soil mortar manufacturing method, wherein in the soil mortar manufacturing step, the slurry is introduced into a soil mortar manufacturing apparatus by the pump truck, and the air foaming agent is introduced into the soil mortar manufacturing apparatus.

5. The soil mortar manufacturing apparatus comprises an agitator vehicle, The soil mortar manufacturing method according to claim 4, wherein in the soil mortar manufacturing step, the soil mortar manufacturing device mixes the slurry and the air foaming agent while moving to a pouring location.

6. 6. The soil mortar manufacturing method according to claim 4 or claim 5, characterized in that in the slurry manufacturing process, a slurry manufacturing device consisting of an agitator vehicle agitates the base material and the water while moving from the point where the base material and the water are introduced to the vicinity of the pump vehicle.

7. a slurry production process in which a base material and water are introduced into a slurry production device at a position away from the soil mortar placement location to produce a slurry; a slurry relay step of transferring the slurry from the slurry production apparatus to a pump vehicle; A foaming agent injection step in which the slurry is injected into a soil mortar manufacturing apparatus comprising an agitator vehicle by the pump vehicle and an air foaming agent is injected; A soil mortar manufacturing process in which the slurry and the air foaming agent are mixed by the soil mortar manufacturing apparatus to manufacture soil mortar, and the soil mortar is moved to the soil mortar casting location by the soil mortar manufacturing apparatus; A soil mortar pouring method comprising a pouring step of discharging soil mortar from the soil mortar manufacturing apparatus and pouring the soil mortar.

8. the slurry production apparatus comprises an agitator wheel, 8. The soil mortar pouring method according to claim 7, wherein in the slurry production step, the slurry production device is moved from a location where the base material and water are introduced to a location near the pump truck.

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