Construction site mortar transportation system

Abstract

The invention discloses a mortar transportation system for a construction site, which is improved aiming at the problem of evaporation caused by temperature change in the transportation process of concrete mortar and is provided with a water sprinkling temperature control assembly aiming at a concrete hopper. The water spraying temperature control assembly has the effects that low-temperature water is sprayed into the concrete hopper to achieve the dual effects of reducing the evaporation capacity and supplementing the evaporation capacity of water, and further on the basis of a thermal evaporation basic model, the surface temperature and the saturation humidity in the transportation process of concrete mortar serve as key variables; the evaporation process of the concrete mortar in the transportation process is simulated through the basic evaporation efficiency obtained through pre-estimation calculation, the floating state of the water content in the concrete mortar is further calculated, and the water content floating rate serves as a key numerical value to further control an action command of the water spraying temperature control assembly. The purpose of the invention is to further maintain the temperature change on the basis of maintaining the water content in the concrete mortar.

Description

Technical Field

[0001] The present invention relates to the technical field of mortar transportation, and particularly relates to a mortar transportation system for a construction site. Background Art

[0002] During the construction process, most of the mortar used is transported to the designated area through a pouring truck, and a concrete transport truck is also required to transport the mortar. During the transportation process, it is necessary to ensure that the concrete is continuously stirred to avoid sedimentation or solidification of the concrete.

[0003] Since the hydration reaction between cement and admixtures is in the initial exothermic process after the concrete is prepared, due to the existence of hydration heat, the water in the concrete inside the hopper is continuously heated and evaporated, resulting in a decrease in the slump of the concrete or a decline in its workability. For this reason, conventional concrete trucks will also sprinkle water in real time when transporting concrete, which can not only play the role of cooling but also maintain the water content. However, it should be noted that excessive water will have an adverse impact on the construction, durability, and appearance quality of the concrete, such as poor concrete wrapping, sand and stone separation, pumping pipe blockage, difficult surface construction and plastering, etc., and the hardened concrete is prone to problems such as upper and lower stratification and surface cracks. For this reason, the present application proposes a solution. Summary of the Invention

[0004] The purpose of the present invention is to provide a mortar transportation system for a construction site. In view of the hydration heat generated by the hydration reaction of the concrete itself during the transportation process of the concrete, the temperature of the concrete gradually rises, accelerating the evaporation of water, which will further affect the performance of the concrete. During the continuous sprinkling process, excessive water will also damage the performance of the concrete.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A mortar transportation system for a construction site is applied during the transportation process of a concrete transport truck. The concrete transport truck includes a concrete hopper and a sprinkling temperature control component corresponding to the concrete hopper. The sprinkling temperature control component is used to perform a sprinkling and cooling action on the inside of the concrete hopper;

[0006] The transportation system includes a task information monitoring unit, an intermittent heat evaporation model unit, and a post-sensation preprocessing action unit. Two parameters, namely the estimated transportation time and the initial parameters of the concrete, are entered into the task information monitoring unit and used as the precursor parameters in the intermittent heat evaporation model unit;

[0007] In the intermittent heat evaporation model unit, a temperature monitoring action is performed on the inside of the concrete hopper. During the temperature monitoring action, the temperature change value is obtained in real time, and the temperature change value is combined with the initial parameters of the concrete to establish a basic heat evaporation model;

[0008] The post-sensation preprocessing unit sends an action response command to the sprinkler temperature control component according to the basic heat evaporation model to maintain the environmental temperature and humidity inside the concrete hopper.

[0009] It is further set that: the initial concrete parameters include the surface temperature, surface saturation humidity and initial water content of the concrete mortar, as well as the air flow rate and environmental humidity in the concrete hopper, and are represented by T con , RH sat , WA o , V tim and RH air respectively. The established basic heat evaporation model is as follows:

[0010] It is further set that: k1 in the basic heat evaporation model is represented as the temperature compensation value, χ k is represented as the conversion constant, and k1, V tim and χ k are represented as fixed values, and are represented by RH sat , T con as variables.

[0011] It is further set that: according to the basic heat evaporation model, a calculation conversion formula for the water content WA o is set, specifically expressed as WA t =WA0 - EiV*Tim + QW t , where WA t represents the predicted water content in the concrete mortar, QW t represents the water replenishment amount of the sprinkler temperature control component to the concrete mortar, and Tim represents the transportation time.

[0012] It is further set that: the post-sensation preprocessing unit sets a monitoring period Zi for the intermittent heat evaporation model unit, performs a single intermittent heat evaporation analysis process in each monitoring period Zi, and sets a lower limit threshold WA for the water content tax and an upper temperature peak TA tax in the intermittent heat evaporation analysis process. According to the lower limit threshold WA of the water content tax , a calculation method for the floating rate MWi is established, which is used to represent the predicted water content value calculated in a single monitoring period Zi.

[0013] It is further set that: a minimum threshold of 1.15 is set for MWi. When MWi < 1.15, a response command is sent to the sprinkler temperature control component to spray low-temperature water into the concrete hopper by the sprinkler temperature control component, and according to the absolute value of MWi - 1.15, WA t =WA0 - EiV*Tim + QWt QW in t 。

[0014] Further set to: when T con > temperature upper limit peak value TA tax , do not perform the intermittent heat evaporation analysis process of the basic heat evaporation model, send a response command to the sprinkler temperature control component, spray low-temperature water inside the concrete hopper, and maintain it at T con less than or equal to TA tax in this state, and shorten the monitoring period to Zi / 2 for the intermittent heat evaporation analysis process.

[0015] The present invention has the following beneficial effects:

[0016] 1. For the transportation process of concrete mortar, the sprinkler temperature control component associated with the concrete hopper is optimized for the evaporation problem exacerbated by the hydration heat reaction process. The essence of the sprinkler temperature control component is a low-temperature water spraying structure. By spraying a certain amount of low-temperature water inside the concrete hopper, on the one hand, it cools the internal environment of the concrete hopper to further reduce the evaporation efficiency of water in the concrete mortar, and on the other hand, it is mainly used to replenish the water content evaporated in the concrete mortar in real time;

[0017] 2. Based on the above content, the key content of the present invention is based on the basic heat evaporation model, with the surface temperature and saturated humidity of the concrete mortar during transportation as key variables. The basic evaporation efficiency inside the concrete hopper is initially calculated by the basic heat evaporation model, and the loss degree of the water content in the concrete mortar is reflected by the basic evaporation efficiency. Based on this, the floating state of the water content in the concrete mortar can be further reflected, and the calculation process of the water content floating rate is carried out for the specific value of the water content. Using the water content floating rate as a key value to further control the action command of the sprinkler temperature control component, the key purpose is: while maintaining the water content in the concrete mortar, further maintaining the temperature change, and avoiding abnormal situations such as excessive loss of water in the concrete mortar or too high temperature due to the mutual influence of temperature and evaporation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic structural diagram of a concrete transport vehicle in a mortar transport system for construction sites proposed by the present invention;

[0020] Figure 2 The figure is a schematic block diagram of the operation of a mortar transportation system for construction sites proposed by the present invention.

[0021] In the figure: 1. Concrete hopper; 2. Sprinkler temperature control component. Specific embodiments

[0022] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work belong to the scope of protection of the present invention.

[0023] Embodiment 1: In view of the hydration heat generated by the hydration reaction of concrete during the transportation process, which causes the temperature of the concrete to gradually rise and accelerates the evaporation of water, further affecting the performance of the concrete, and during the continuous sprinkling process, excessive water will also damage the performance of the concrete. The following technical solutions are proposed:

[0024] Refer to Figure 1 and Figure 2 In this embodiment, a mortar transportation system for construction sites is applied during the transportation of a concrete transport vehicle. The concrete transport vehicle includes a concrete hopper 1 and a sprinkler temperature control component 2 corresponding to the concrete hopper 1. The sprinkler temperature control component 2 is used to perform a sprinkling and cooling action on the inside of the concrete hopper 1;

[0025] The transportation system includes a task information monitoring unit, an intermittent heat evaporation model unit, and a post-sensation preprocessing action unit. Two parameters, namely the estimated transportation time and the initial concrete parameters, are entered into the task information monitoring unit and used as the precursor parameters in the intermittent heat evaporation model unit;

[0026] In the intermittent heat evaporation model unit, a temperature monitoring action is performed on the inside of the concrete hopper 1. During the temperature monitoring action, the temperature change value is obtained in real time, and the temperature change value is combined with the initial concrete parameters to establish a basic heat evaporation model;

[0027] The post-sensation preprocessing unit sends an action response command to the sprinkler temperature control component according to the basic heat evaporation model to maintain the environmental temperature and humidity inside the concrete hopper 2.

[0028] Basic principle: For the concrete mortar used at the construction site, most of it is transported to the construction site in a timely manner by a concrete transport vehicle from the qualified mortar prepared at the concrete production base. It should be noted here that: due to the hydration heat reaction between the cement minerals and water in the preparation raw materials, the prepared concrete mortar is in a continuous heat release state, which accelerates the evaporation of water in the concrete. Under the dual influence of the rising heat and the loss of water, it will accelerate the curing process of the concrete and even affect the basic structural characteristics of the concrete material;

[0029] For this conventional concrete transport vehicle, on the one hand, it is necessary to keep the concrete mortar in a continuous stirring state to avoid the problems of curing and precipitation, and on the other hand, it is also necessary to continuously sprinkle water inside the concrete hopper 1, use low-temperature water to cool the inside of the concrete hopper 1, and can also supplement the evaporated water into the concrete mortar. However, too much water will also indirectly affect the quality of the concrete mortar. For this, the present invention mainly proposes a heat evaporation basic model for this problem, which is specifically as follows:

[0030] Among them, Eiv represents the basic evaporation efficiency of the concrete mortar, T con represents the surface temperature in the concrete mortar, V tim represents the air flow rate in the concrete hopper 1, RH sat represents the surface saturation humidity in the concrete mortar, RH air represents the environmental humidity in the concrete hopper 2, and k1 among them represents the temperature compensation value, χ k represents the conversion constant. Among them, k1 and χ k are fixed values, and the initial parameters of the concrete include RH sat , the initial value of water content WA o , the fixed value of the initial temperature TH o ;

[0031] And it should be noted that: among them, T con can be obtained in real time through structures such as infrared thermometers set in the concrete hopper, and V tim is mainly related to the rotation speed of the concrete hopper and is set as a fixed value in the present invention, while RH sat and RH air can be obtained in real time through the infrared imaging method. In the heat evaporation basic model, RH sat and T con are used as variables;

[0032] It needs to be further understood that: among them, k1 mainly acts as the influence process of the environmental temperature. The water content in the concrete mortar is inversely proportional to the evaporation efficiency Eiv, and a basic conversion formula for the water content is derived according to the heat evaporation basic model, WA t= WA0 - EiV * Tim + QW t , where WA t represents the estimated water content in the concrete mortar, QW t represents the water replenishment amount of the sprinkler temperature control component 2 to the concrete mortar, and Tim represents the transportation time. This part is the basic working principle in the present invention.

[0033] Embodiment 2: The following supplementary description is made based on the basic heat evaporation model in Embodiment 1:

[0034] Set the calculation conversion formula for the initial water content value WA o according to the basic heat evaporation model, specifically expressed as WA t = WA0 - EiV * Tim + QW t , where WA t represents the estimated water content in the concrete mortar, QW t represents the water replenishment amount of the sprinkler temperature control component 2 to the concrete mortar, and Tim represents the transportation time. The post-sense preprocessing unit sets the monitoring period Zi for the intermittent heat evaporation model unit, and performs a single intermittent heat evaporation analysis process in each monitoring period Zi, and sets the lower water content threshold WA tax and the upper temperature peak value TA tax in the intermittent heat evaporation analysis process. According to the lower water content threshold WA tax , establish the calculation method of the floating rate MWi, which is used to represent the estimated water content value calculated in a single monitoring period Zi;

[0035] Because the heat evaporation process and the hydration heat process continue, but there are differences in the evaporation efficiency and the heat release efficiency. For this reason, the following analysis process needs to be carried out on the post-sense preprocessing unit in combination with the basic heat evaporation model;

[0036] S1: First, evaluate the WA t of the concrete mortar reaching the construction site according to the construction requirements of the construction site and the estimated transportation time. However, it is difficult to directly obtain the evaporation efficiency and the temperature change of the concrete mortar during transportation in this process. For this reason, the present invention adopts an intermittent temperature monitoring action for the basic heat evaporation model, and sets the monitoring period Zi according to the estimated transportation time, and performs a single intermittent heat evaporation analysis process in each monitoring period Zi;

[0037] S2: According to the construction requirements of the concrete mortar at the construction site, directly set the lower water content threshold and the upper temperature peak value of WA tax , TA tax for the water content and temperature change value of the concrete mortar, and set the calculation method of the floating rate for the water content of the concrete mortar, Among them, is used to represent the predicted water content value calculated in a single monitoring period Zi. MWi represents the floating rate of the water content, and represents the predicted water content value obtained in the previous monitoring period Zi, and the following analysis process is carried out;

[0038] S2-1: In the present invention, the situation of less than WA tax is not allowed. For this, a minimum threshold of 1.15 is further set for MWi. The purpose is to ensure that the water content in the concrete mortar is always greater than WA tax , and sufficient hot steaming time is reserved. When MWi is less than 1.15, a response command is sent to the sprinkler temperature control component 2, so that the sprinkler temperature control component 2 sprays low-temperature water into the concrete hopper 1, and further according to the absolute value of MWi - 1.15, WA is reversely calculated as t = WA0 - EiV * Tim + QW t where QW in t ; conversely, when MWi is greater than 1.15, it is not necessary to spray low-temperature water into the concrete hopper 1.

[0039] The basic content of this embodiment is: By spraying low-temperature water into the concrete hopper, the dual effects of cooling to reduce the evaporation amount and supplementing the water evaporation amount are achieved. Further, based on the basic hot steaming model, with the surface temperature and saturation humidity of the concrete mortar during transportation as key variables, the evaporation process of the concrete mortar during transportation is simulated through the predicted basic evaporation efficiency, and the post-sensing pretreatment process is carried out.

[0040] Embodiment Three: Further supplement and explain with the technical content in Embodiment Two;

[0041] When low-temperature water is injected into the concrete hopper 1, it will also further affect the surface temperature of the concrete mortar in the concrete hopper 1, and thus will further affect the basic evaporation efficiency of the concrete mortar in the basic hot steaming model. In this process, it is also necessary to further consider the temperature upper limit peak TA in Embodiment Two tax , and spraying low-temperature water will also further affect the surface saturation humidity and environmental humidity of the concrete mortar in Embodiment One. Therefore, T con , RH sat and RH air are re-entered in the next monitoring period Zi for the analysis process of the basic hot steaming model, and the following content is also included:

[0042] Affected by the ambient temperature during transportation, such as in the high temperature environment in summer, the surface temperature of the concrete mortar gradually increases. In this process, the basic evaporation efficiency of the concrete mortar is not considered. Instead, a response command is directly sent to the sprinkler temperature control component 2 to spray low-temperature water inside the concrete hopper 1, so that the surface temperature of the concrete mortar gradually stabilizes at a temperature less than the upper temperature peak TA. tax This state is explained in combination with the basic model of thermal steam. As the surface temperature T con The increase of will also accelerate the evaporation efficiency. In this case, the monitoring period is directly shortened to Zi / 2. The purpose is to analyze the basic evaporation efficiency, water content and temperature change of the concrete mortar inside the concrete hopper 1 by shortening the monitoring period, so as to avoid abnormal problems such as curing of the concrete mortar due to the influence of water content and temperature.

[0043] In summary: Improvements are made to the evaporation problem caused by temperature changes during the transportation of concrete mortar. A watering temperature control component is set for the concrete hopper. The function of the watering temperature control component is to spray low-temperature water into the concrete hopper to achieve the dual effects of cooling and reducing evaporation and supplementing water evaporation. It is further based on the basic model of thermal steaming, and takes the surface temperature and saturated humidity of concrete mortar during transportation as key variables. The basic evaporation efficiency obtained through estimated calculation is used to simulate the evaporation process of concrete mortar during transportation. Further, according to the calculation of the floating state of water content in concrete mortar, the water content floating rate is used as the key value to further control the action command of the watering temperature control component. Its purpose is to further maintain the temperature change on the basis of maintaining the water content in the concrete mortar.

[0044] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0046] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments only. Obviously, according to the content of this specification, many modifications and variations can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A mortar transportation system for construction sites, which is applied during the transportation of concrete mixers, is characterized in that, The concrete transport vehicle includes a concrete hopper (1) and a sprinkler temperature control assembly (2) corresponding to the concrete hopper (1), and the sprinkler temperature control assembly (2) is used to perform a sprinkling and cooling action on the inside of the concrete hopper (1); The transport system includes a task information monitoring unit, an intermittent heat evaporation model unit, and a post-sensation preprocessing action unit. Two parameters, namely the transport estimated time and the initial concrete parameters, are entered in the task information monitoring unit and used as the precursor parameters in the intermittent heat evaporation model unit; In the intermittent heat evaporation model unit, a temperature monitoring action for the inside of the concrete hopper (1) is performed. During the temperature monitoring action, the temperature change value is obtained in real time, and the temperature change value is combined with the initial concrete parameters to establish a basic heat evaporation model; The post-sensation preprocessing unit sends an action response command to the sprinkler temperature control assembly according to the basic heat evaporation model to maintain the environmental temperature and humidity inside the concrete hopper (2).

2. The mortar transportation system for a construction site according to claim 1, characterized in that, The initial parameters of the concrete include the surface temperature, surface saturation humidity, and initial water content of the concrete mortar, as well as the air velocity and ambient humidity in the concrete hopper (1), which are represented by T con , RH sat , WA o , V tim and RH air respectively. The established basic heat evaporation model is as follows:

3. The mortar transportation system for a construction site according to claim 2, characterized in that, In the basic heat evaporation model, k1 is represented as a temperature compensation value, χ k is represented as a conversion constant, and k1,, V tim and χ k are represented as fixed values, with RH sat and T con represented as variables.

4. The mortar transportation system for a construction site according to claim 2, characterized in that, Set the calculation conversion formula for the initial value WA of water content according to the basic heat evaporation model o , specifically expressed as WA t = WA0 - EiV * Tim + QW t , where WA t represents the predicted value of water content in the concrete mortar, QW t represents the water replenishment amount of the sprinkler temperature control component (2) to the concrete mortar, and Tim represents the transportation time consumption.

5. A mortar transportation system for a construction site according to claim 4, wherein, The post-sensation preprocessing unit sets a monitoring period Zi for the intermittent thermal evaporation model unit, performs a single intermittent thermal evaporation analysis process in each monitoring period Zi, and sets a lower limit threshold WA for the water content during the intermittent thermal evaporation analysis process tax and an upper limit peak TA for the temperature tax , and based on the lower limit threshold WA for the water content tax establishes a calculation method for the floating rate MWi which is used to represent the estimated value of the water content calculated in a single monitoring period Zi 6. The mortar transportation system for a construction site according to claim 5, characterized in that, Set the minimum threshold of 1.15 for MWi. When MWi < 1.15, send a response command to the sprinkler temperature control component (2) so that the sprinkler temperature control component (2) sprays low-temperature water into the concrete hopper (1), and inversely calculate WA based on the absolute value of MWi - 1.15 t = WA0 - EiV * Tim + QW t QW in t .

7. A mortar transportation system for a construction site according to claim 6, characterized in that, When T con > the temperature upper limit peak value TA tax , the intermittent heat evaporation analysis process of the basic heat evaporation model is not carried out, a response command is sent to the sprinkling water temperature control component (2), low-temperature water is sprayed inside the concrete hopper (1), and it is maintained at T con less than or equal to TA tax In this state, and the monitoring period is shortened to Zi / 2 for the intermittent heat evaporation analysis process.

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